GB1569118A - Creación de Inventos y Patentes con Inteligencia Artificial

GB1569118A – Cameras
– Google Patents

GB1569118A – Cameras
– Google Patents
Cameras

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Publication number
GB1569118A

GB1569118A
GB45875/76A
GB4587576A
GB1569118A
GB 1569118 A
GB1569118 A
GB 1569118A
GB 45875/76 A
GB45875/76 A
GB 45875/76A
GB 4587576 A
GB4587576 A
GB 4587576A
GB 1569118 A
GB1569118 A
GB 1569118A
Authority
GB
United Kingdom
Prior art keywords
cam
exposure mode
exposure
carrier
camera
Prior art date
1975-11-06
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)

Expired

Application number
GB45875/76A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Olympus Corp

Original Assignee
Olympus Optical Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1975-11-06
Filing date
1976-11-04
Publication date
1980-06-11

1976-11-04
Application filed by Olympus Optical Co Ltd
filed
Critical
Olympus Optical Co Ltd

1980-06-11
Publication of GB1569118A
publication
Critical
patent/GB1569118A/en

Status
Expired
legal-status
Critical
Current

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Classifications

G—PHYSICS

G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY

G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR

G03B17/00—Details of cameras or camera bodies; Accessories therefor

G03B17/18—Signals indicating condition of a camera member or suitability of light

G03B17/20—Signals indicating condition of a camera member or suitability of light visible in viewfinder

G—PHYSICS

G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY

G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly

G03B7/04—Control effected by hand adjustment of a member that senses indication of a pointer of a built- in light-sensitive device, e.g. by restoring point to a fixed associated reference mark

G—PHYSICS

G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY

G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly

G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device

G03B7/081—Analogue circuits

Description

(54) IMPROVEMENTS IN OR RELATING TO CAMERAS
(71) We, OLYMPUS OPrlCAL COMPANY LTD. a Japanese Corporation of 43-2, 2
Chome, Hatagaya, Shibuya-Ku, Tokyo,
Japan, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: The present invention relates to cameras.
A camera having an electrical shutter is known which comprises a photometric circuit for automatic exposure and its associated first shutter drive and control circuit as well as another photometric circuit for manual exposure and its associated second shutter drive and control circuit. A camera of this type enables pictures to be taken in both automatic and manual exposure modes by selecting either combination of the photometric circuit and the shutter drive and control circuit by means of a changeover switch. A camera of the type described incorporates a so-called zero method exposure means for taking pictures in the manual exposure mode wherein the pointer of an exposure meter which is interlocked with an exposure control mechanism of the camera is brought into alignment with the zero method index appearing within the field of the viewfinder, thereby manually determining a proper exposure.
When taking pictures in the automatic exposure mode, either the exposure period is automatically determined against a preset diaphragm aperture which is established by an aperture setting ring or the diaphragm aperture is automatically determined against a preset exposure period which is established by a period setting ring. With a camera having an electrical shutter thus designed, the automatic determination of the exposure period or the diaphragm aperture presents a problem in the recognition of their specific value. To overcome this difficulty, it is also proposed to provide an exposure period display panel or a diaphragm aperture display panel which is associated with a meter pointer exposed in the field of a viewfinder and capable of indicating a shutter period or a diaphragm aperture. Such a construction is already known in a camera having an electrical shutter which is only capable of taking pictures in an automatic exposure mode.
However, this arrangement cannot be adopted in a camera having an electrical shutter which permits taking pictures in both automatic and manual exposure mode since then there would exist a pair of meter pointers within the field of the viewfinder in either manual or automatic exposure mode, namely a meter pointer and its associated zero method index for taking pictures in the manual exposure mode, and a second meter pointer for indicating the value of the automatic exposure and associated display panels for the exposure period and the diaphragm aperture in the automatic exposure mode. The presence of these pointers prevents a correct reading of the proper indication. In addition, a pair of photometric circuits and a pair of meters are necessary, resulting in a complex arrangement.
According to the present invention there is provided a camera having an indicator for automatic and manual exposure modes, an electrically controlled shutter, a photometric circuit, a first shutter drive and control circuit associated with the automatic exposure mode in which one of the exposure factors diaphragm aperture and exposure period is preset and the other is determined automatically by the photometric circuit, a second shutter drive and control circuit associated with the manual exposure mode in which one of the exposure factors is preset and the other is manually correlated to the photometric circuit, a change-over switch selectively operable so as to permit pictures to be taken in the automatic exposure mode or in the manual exposure mode, and said indicator comprising a meter which is actuable in accordance with the brightness of a photographic subject, a meter indicator extending into and exposed within the field of a viewfinder, a selection switch for selecting either the automatic exposure mode or the manual exposure mode, a rotary shaft responsive to a switching action of the selection switch to change the changeover switch, a display panel disposed adjacent the meter indicator and carrying a zero method index for use in the manual exposure mode and carrying an exposure factor scale for displaying the automatically determined exposure factor in the automatic exposure mode, and a carrier for sup porting the display panel and responsive to movement of the selection switch to the automatic exposure mode position to slide to a first display position in which the zero method index and the scale are presented within the field of the viewfinder and responsive to movement of the selection switch to the manual exposure mode position to slide to a second display position in which the zero method index alone is presented within the field of the viewfinder.
A camera embodying the present invention can therefore not only incorporate an exposure mode indicator and an electrically controlled shutter but also incorporate a single meter and a single composite photometric circuit while permitting an indication of the zero method index in the manual exposure mode and an indication of an exposure factor in the automatic exposure mode to be given within the field of a viewfinder by a switching action.
The invention will be further described by way of example with reference to the accompanying drawings, in which: Fig. 1 is an exploded, perspective view of the exposure indicator constructed in accordance with one embodiment of the invention,
Fig. 2 is a circuit diagram of one exemplary form of the photometric circuit, and
Fig. 3 is a circuit diagram of one exemplary form of a shutter drive and control circuit.
Referring to Fig. 1, there is shown a switching knob 1 which provides selection between an automatic exposure mode and a manual exposure mode. The knob 1 is exposed externally of the camera and can be aligned with a selected one of AUTO.
OFF and MANUAL indices labelled on the casing of the camera by an incremental rotation through 45″. It is to be noted that the camera of the present embodiment is designed such that a diaphragm aperture is manually preset and an exposure period is automatically controlled in the automatic exposure mode, while in the manual exposure mode, an exposure period is determined by turning an exposure period setting ring and then a proper diaphragm aperture is established by turning a diaphragm aperture setting ring to bring a meter pointer into alignment with a zero method index.
The knob 1 includes a circular end which is fixedly connected with a rotary shaft 2, which extends into the interior of the camera and which is formed with an axial projection 2a having both its lateral sides removed. The projection 2a extends through a slit 3c formed centrally in a cam 3 and then tightly fits in a diametrically extending notch 4a formed in the top face of a switch changing shaft 4, thus connecting the cam 3 and the shaft 4 together with the rotary shaft 2 for integral rotation.
The cam 3 comprises a disc cam, which is formed with a first cam edge 3a having a radial height of 11 for an automatic exposure and a second cam edge 3b having a radial height of 12 for a manual exposure along parts of its periphery. It is to be understood that cam edges 3a, 3b are phase displaced by 90″ from each other along the periphery of the disc. The radial height 12 of the cam edge 3b is nearly one-half the radial height li of the cam edge 3a. As will be described later, the cam 3 serves for controlling a stroke through which a display panel carrier 8, which will be described later, can be shifted.
A U-shaped rocking arm 5 is disposed below the cam 3, generally in alignment with the outer periphery thereof. The rocking arm 5 operatively connects the cam 3 and the carrier 8 together, and has one end 5a which is pivotally mounted on a pin indicated at 6. A connecting pin 7 is fixedly mounted on the other end 5b of the rocking arm 5, and extends to be received in a fork 8a formed in one end of the carrier 8. Intermediate its ends, the rocking arm 5 fixedly carries a pin 9 which is adapted to be engaged selectively by the two cam edges 3a, 3b, and by a recess 3d located between these cam edges.
The carrier 8 comprises a slidable plate disposed for sliding movement along one longer side of a focusing plate 10 of the camera, and is formed with a pair of longitudinally spaced, elongate guide slots 8b, 8c, which are engaged by stationary pins gila, lib so as to restrict the movement of the carrier in a direction parallel to the longer side of the focusing plate 10. The carrier 8 is L-shaped in configuration, and thus includes an extension 8d extending along the side of the focusing screen 10 which is located on the opposite side from the cam 3. The extension 8d forms a support for a display panel 12 to be described below.
The display panel 12 comprises a thin, rectangular sheet of a transparent material which is secured on the upper surface of the support 8d having its longer side extending in parallel relationship with the support 8d. Along its one longitudinal edge, the display panel 12 is secured to the sup gort 8d. On the opposite longitudinal edge, which is located inwardly, the display panel
12 is centrally formed with an extension
12a which extends over the focusing screen
10. A zero method index 13 is inscribed for use in a manual exposure mode. A
scale of numbers 14 such as 1, 2, 4… 1,000, indicating values of an exposure period, are given in succession on the display panel
12.
The carrier 8 is biased by a coiled spring
15 to move in the direction indicated by an arrow a, and the resulting movement of the carrier is transmitted through the pin 7 and the rocking arm 5 to the pin 9, which is
therefore urged to bear against the cam edge of the cam 3. In this manner, movement of the carrier 8 is controlled by the cam edges 3a, 3b and the recess 3d. When the pin 9 bears against the cam edge 3a, the carrier 8 is allowed to slide through a relatively larger stroke in the direction indicated by an arrow b, thus moving to a first display position in which the index 13 and the numerals 14 are exposed in the field of the viewfinder. When the pin 9 bears against the cam edge 3b, the carrier 8 undergoes a sliding movement through a relatively smaller stroke in the direction of the arrow b, thus moving to a second display position in which only the index 13 is exposed in the field of the viewfinder. Finally, when the pin 9 bears against the recess 3d, the carrier 8 moves to a position in which the index 13 and the numerals 14 disappear out of the field of the viewfinder.
There is provided a photometric meter 16 having a pointer 17 which extends over the display panel 12. The meter 16 is electrically connected with a photometric circuit to be described later, and operates in accordance with the brightness of an object being photographed. The meter 16 has its housing supported by a rotatable disc 18, which is in turn connected with a diaphragm
aperture setting ring 20 through a trans
mission cord 19. Specifically, the disc 18
is formed with a peripheral groove in which
the transmission cord 19 is received, one end of the cord being secured to the disc
18. The cord 19 then extends around a pulley 21 and is passed around the periphery of the ring 20 to be secured thereto. Thus when the ring 20 having a plurality of dia
phragm blades (of which only one is shown) is turned about the optical axis of the tak
ing lens, not shown, the disc 18 also rotates to cause the meter 16 to rotate
about its axis, resulting in an angular move -ment of the meter pointer 17.
A change-over switch SW2, which is associated with a photometric circuit to be -described later in connection with Fig. 2 for switching its operation between an auto fanatic exposure mode and a manual ex
posure mode, is disposed below the cam 3.
The switch SW2 comprises a printed circuit
board 22, a plurality of stationary contacts
SW2aO, SW2bO, SW2cO, and a movable con
tact SW2a which is adapted to slide over
these stationary contacts. Specifically, the
printed circuit board 22 is centrally formed
with an opening 22a through which the
shaft 4 extends from below. The stationary
contacts SW2aO to SW2cO are printed on
the upper surface of the circuit board
around the opening 22a. The movable con
tact SW2a engages the stationary contact
SW2cO in the manual exposure mode while
it engages the stationary contact SW2bO in
the automatic exposure mode. The mov
able contact SW2a is fixedly attached to
the lower end of an electrically insulating
rod 23 which is fixed on and depends from
the cam edge 3a, and is adapted to rotate
about the opening 22a to provide a switch
ing action as the cam 3 rotates.
Another change-over switch SW1 asso
ciated with a shutter drive and control cir
cuit, to be described later, is disposed below
the change-over switch SW2. The switch
SW1 switches the shutter drive and control
circuit, shown in Fig. 3, between the auto
matic exposure mode and the manual ex
posure mode. Specifically, the switch SW2
comprises a printed circuit board 24, a
plurality of stationary contacts SWlaO,
SWlbO, SWlcO printed on the upper sur
face thereof, and a movable contact SWla
which is adapted to slide over these station
ary contacts. As before, the board 24 is
centrally formed with an opening 24a
through which the shaft 4 rotatably extends.
The movable contact engages the stationary
contact SWlbO in the automatic exposure
mode and engages the stationary contact
SWlcO in the manual exposure mode. The
movable contact SWla is integrally carried
by the shaft 4, which comprises an electri
cally insulating material, for rotation about
the opening 24a, and thus provides a switch
ing action as the shaft 4 rotates.
Fig. 2 shows a photometric circuit which
is switched between the automatic and a
manual exposure modes bv means of the
change-over switch SW2. The photometric
circuit includes a d.c. source E across which
is connected a series circuit comprising a
photometric, light receiving element 25,
a fixed resistor R1 and the meter 16, with
the series combination of the resistor R1 and the meter 16 being shunted by a fixed
resistor R2. The element 25 comprises a
photo-electric transducer element such as
a CdS element and receives reflected light
from a photographic subject to conduct a
current through the meter 16 in accordance
with the brightness thereof. The series combination of the element 25 and the re
sistor R1 is also shunted by a variable re sistor VRI which serves for presetting a film speed.
The junction between the variable resistor VRl and the element 25 is connected with a terminal SW2aa (see Fig. 1) of the stationary contact SW2aO which is engaged by the movable contact of the change-over switch
SW2. A terminal SW2b associated with the stationary contact for the automatic exposure mode is connected with the junction between the variable resistor VR1 and the resistor R1 through a resistor R3 which provides a correction for the shutter speed.
A terminal SW2c associated with the stationary contact for the manual exposure mode is connected with the same junction through another variable resistor VR2. The variable resistor VR2 is mechanically interlocked with a shutter period setting ring, not shown, for introducing information concerning a desired exposure period into the photometric circuit in the manual exposure mode.
Fig. 3 shows a circuit arrangement for switching a shutter drive and control circuit between the automatic and manual exposure modes by means of the change-over switch SW1. The electrical shutter includes an electromagnet Mg which can be activated to allow the shutter blades to be closed.
The electromagnet Mg is driven by an output either from a shutter drive and control circuit 26 associated with an automatic exposure of from a shutter drive and control circuit 27 associated with a manual exposure. The circuit 26 comprises an electrical shutter circuit of a convential form which automatically determines the exposure period and takes into account relevant factors such as diaphragm aperture (preset manually), film speed (preset manually) and subject brightness (photo-electric transducer element), and the circuit 27 is also formed by an electrical shutter circuit of a conventional form which permits a manual setting of an exposure period.
The change-over switch SW1 operates to connect the source E with the circuit 26 in the automatic exposure mode and to connect the source E with the circuit 27 in the manual exposure mode. Specifically, a terminal SWlaa is connected with a d.c. source
E, and a terminal SWlb associated with the stationary contact for an automatic exposure is connected with the shutter drive and control circuit 26 while a terminal SW1c associated with the stationary contact for a manual exposure is connected with the shutter drive and control circuit 27.
In operation, assuming that the knob 1 is initially in the OFF position, and it is desired to take pictures in the automatic exposure mode, the diaphragm aperture setting ring 20 is turned to establish a desired diaphragm aperture, since the camera disclosed is of a preset diaphragm aperture type, and this turns meter 16 through a corresponding angle. Subsequently, the knob 1 is turned counter-clockwise through 45″ to align it with the AUTO index. As a result of turning the knob 1, the rotary shaft 2 rotates counter-clockwise through 45″ about its axis, accompanying a corresponding rotation of the cam 3. Thus the cam 3a engages and angularly moves the pin 9, whereby the rocking arm 5 is turned clockwise about the pin 6. This movement is transmitted through the pin 7 to cause a sliding movement of the carrier 8 through the relatively larger stroke in the direction of the arrow b against the resilience of the spring 15 thus moving the carrier to its first display position, The display panel 12 integrally moves with the carrier, presenting the zero method index 13 and the exposure numerals 14 within the field of the viewfinder.
The described counter-clockwise rotation of the rotary shaft 2 through 45″ causes a corresponding counter-clockwise rotation of the switch changing shaft 4 through 45″, whereby the movable contact SWla is moved into engagement with the stationary contact SWlbO for an automatic exposure as shown in Fig. 1, thus connecting the source E with the shutter drive and control circuit 26 for an automatic exposure, as illustrated in Fig. 3. The rotation of the cam 3 also causes the movable contact
SW2a of the change-over switch SW2 to engage the stationary contact SW2bO for an automatic exposure, as shown in Fig. 1, and become connected with the terminal SW2b, thus selecting the automatic exposure part of the photometric circuit, as shown in Fig.
2. As a result, the light receiving element 25 receives reflected light from a photographic subject to conduct a current through the meter 16 in accordance with the brightness of the subject. The pointer 17 swings in accordance with the value of current conducted through the meter 16. A resulting deflection of the pointer 17 can be read by a particular one of the scale of numerals indicated on the display panel 12, thus indicating the exposure period which is provided by the electrical shutter.
When changing the camera from the automatic to the manual exposure mode, the knob 1 is turned clockwise through 90″ into alignment with the index MANUAL.
In the manual exposure mode, an exposure period is preset, so that the exposure period setting ring is turned to establish a desired exposure period. As the ring is turned, the effective resistance of the variable resistor
VR2 is varied to introduce information representing an exposure period into the photometric circuit.
As the rotary shaft 2 is rotated through 90 , the cam 3 is also rotated clockwise through 90″, whereby the cam edge 3b bears against the pin 9. Because the cam edge 3b has a radial height which is one talf that of the cam edge 3a, it causes the rocking arm 5 to rotate counter-clockwise about the pin 6. As a consequence, the carrier 8 slides in the direction of the arrow a moving to a second display position. The display panel 12 thereon also moves to move the display scale of numerals 14 out of the field of the viewfinder, presenting the zero method index 13 alone within such field.
A clockwise rotation of the cam 3 and the switch changing shaft 4 through 90″ accompanies a clockwise rotation of the movable contacts SW2a and SWla through 90″, thereby bringing them into engagement with the terminals SW2c, SWlc associated with the respective stationary contacts for the manual exposure mode.
When the change-over switch SWI is thrown to the terminal SWlc, the source
E is connected with the shutter drive and control circuit 27 for the manual exposure mode. When the photometric circuit is switched for the manual exposure mode, the element 25 operates similarly as before to activate the meter 16, causing a deflection of the pointer 17 thereof in accordance with the brightness of a photographic subject. In the manual exposure mode, since the zero method is employed, the diaphragm aperture setting ring 20 is turned to cause a rotation of the meter 16 so as to bring the pointer 17 into alignment with the zero method index 13 within the field of the viewfinder. In this manner, the ring 20 may be used to determine a proper diaphragm aperture corresponding to a preset shutter period, thereby enabling a proper exposure through the action of the shutter drive and control circuit 27 upon shutter release.
When not in use. the knob 1 may be aligned with the OFF index. In this instance, the rotary shatf 2 is rotated through 45″ to cause the pin 9 to bear against the recess 3d in the cam 3. This results in a counter-clockwise rotation of the rocking arm 5 about the pin 6, whereby the resulting movement is transmitted through the pin 7 to move the carrier 8 in the direction of the arrow a, moving the display panel 12 out of the field of the viewfinder. Thus the display scale of numerals 14 and the zero method index 13 disappear from the field of the viewfinder, indicating that the camera is in its inoperative condition. In the inoperative condition of the camera, the movable contacts SWla, SW2a are thrown to OFF positions intermediate the terminals
SWlb, SW2b and the terminals SWlc,
SW2c.
While in the embodiment described above, the rotary shaft 2 on which the knob 1 is mounted as well as the carrier 8 which carries the display panel 12 has been interconnected through the cam 3 and the rocking arm 5 so as to convert a rotary motion of the shaft 2 into a translational movement of the carrier 8, it should be understood that for a small angle of rotation through which the knob 1 rotates, the cam and the rocking arm may be omitted, and an interconnecting pin may be directly secured to the rotary shaft 2 for causing a translational movement of the carrier. However, the use of the cam and the rocking arm provides a flexibility in the design of the radial height and the location of the cam edges, thus permitting any desired stroke of the carrier 8 to be obtained without being limited by the angle of rotation through which the knob 1 is caused to rotate.
It is also possible in the manual exposure mode alternatively to preset the diaphragm aperture by rotating the setting ring 20 thereby rotating the meter 16, and thereafter rotating the exposure setting ring, and thereby adjusting the variable resistor VR2 of Fig. 2, until the pointer 17 is in alignment with the zero method index 13 indicating that an exposure period corresponding to the preset diaphragm aperture has been selected.
While the invention has been described above as applied to a camera in which a diaphragm aperture is preset in the automatic exposure mode, it will be understood that the invention can also be applied to a camera in which an exposure period is preset in the automatic exposure mode.
WHAT WE CLAIM IS:- 1. A camera having an indicator for automatic and manual exposure modes, an electrically controlled shutter, a photometric circuit, a first shutter drive and control circuit associated with the automatic exposure mode in which one of the exposure factors diaphragm aperture and exposure period is preset and the other is determined automatically by the photometric circuit, a second shutter drive and control circuit associated with the manual exposure mode in which one of the exposure factors is preset and the other is manually correlated to the photometric circuit, a change-over switch selectively operable so as to permit pictures to be taken in the automatic exposure mode or in the manual exDosure mode, and said indicator comprising a meter which is actuable in accordance with the brightness of a photographic subject, a meter indicator extending into and exposed within the field of a viewfinder, a selection switch for selecting either the automatic exnosure mode or the manual exposure mode, a rotary shaft responsive to a switching action of the selection switch to change
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. 90 , the cam 3 is also rotated clockwise through 90″, whereby the cam edge 3b bears against the pin 9. Because the cam edge 3b has a radial height which is one talf that of the cam edge 3a, it causes the rocking arm 5 to rotate counter-clockwise about the pin 6. As a consequence, the carrier 8 slides in the direction of the arrow a moving to a second display position. The display panel 12 thereon also moves to move the display scale of numerals 14 out of the field of the viewfinder, presenting the zero method index 13 alone within such field. A clockwise rotation of the cam 3 and the switch changing shaft 4 through 90″ accompanies a clockwise rotation of the movable contacts SW2a and SWla through 90″, thereby bringing them into engagement with the terminals SW2c, SWlc associated with the respective stationary contacts for the manual exposure mode. When the change-over switch SWI is thrown to the terminal SWlc, the source E is connected with the shutter drive and control circuit 27 for the manual exposure mode. When the photometric circuit is switched for the manual exposure mode, the element 25 operates similarly as before to activate the meter 16, causing a deflection of the pointer 17 thereof in accordance with the brightness of a photographic subject. In the manual exposure mode, since the zero method is employed, the diaphragm aperture setting ring 20 is turned to cause a rotation of the meter 16 so as to bring the pointer 17 into alignment with the zero method index 13 within the field of the viewfinder. In this manner, the ring 20 may be used to determine a proper diaphragm aperture corresponding to a preset shutter period, thereby enabling a proper exposure through the action of the shutter drive and control circuit 27 upon shutter release. When not in use. the knob 1 may be aligned with the OFF index. In this instance, the rotary shatf 2 is rotated through 45″ to cause the pin 9 to bear against the recess 3d in the cam 3. This results in a counter-clockwise rotation of the rocking arm 5 about the pin 6, whereby the resulting movement is transmitted through the pin 7 to move the carrier 8 in the direction of the arrow a, moving the display panel 12 out of the field of the viewfinder. Thus the display scale of numerals 14 and the zero method index 13 disappear from the field of the viewfinder, indicating that the camera is in its inoperative condition. In the inoperative condition of the camera, the movable contacts SWla, SW2a are thrown to OFF positions intermediate the terminals SWlb, SW2b and the terminals SWlc, SW2c. While in the embodiment described above, the rotary shaft 2 on which the knob 1 is mounted as well as the carrier 8 which carries the display panel 12 has been interconnected through the cam 3 and the rocking arm 5 so as to convert a rotary motion of the shaft 2 into a translational movement of the carrier 8, it should be understood that for a small angle of rotation through which the knob 1 rotates, the cam and the rocking arm may be omitted, and an interconnecting pin may be directly secured to the rotary shaft 2 for causing a translational movement of the carrier. However, the use of the cam and the rocking arm provides a flexibility in the design of the radial height and the location of the cam edges, thus permitting any desired stroke of the carrier 8 to be obtained without being limited by the angle of rotation through which the knob 1 is caused to rotate. It is also possible in the manual exposure mode alternatively to preset the diaphragm aperture by rotating the setting ring 20 thereby rotating the meter 16, and thereafter rotating the exposure setting ring, and thereby adjusting the variable resistor VR2 of Fig. 2, until the pointer 17 is in alignment with the zero method index 13 indicating that an exposure period corresponding to the preset diaphragm aperture has been selected. While the invention has been described above as applied to a camera in which a diaphragm aperture is preset in the automatic exposure mode, it will be understood that the invention can also be applied to a camera in which an exposure period is preset in the automatic exposure mode. WHAT WE CLAIM IS:-

1. A camera having an indicator for automatic and manual exposure modes, an electrically controlled shutter, a photometric circuit, a first shutter drive and control circuit associated with the automatic exposure mode in which one of the exposure factors diaphragm aperture and exposure period is preset and the other is determined automatically by the photometric circuit, a second shutter drive and control circuit associated with the manual exposure mode in which one of the exposure factors is preset and the other is manually correlated to the photometric circuit, a change-over switch selectively operable so as to permit pictures to be taken in the automatic exposure mode or in the manual exDosure mode, and said indicator comprising a meter which is actuable in accordance with the brightness of a photographic subject, a meter indicator extending into and exposed within the field of a viewfinder, a selection switch for selecting either the automatic exnosure mode or the manual exposure mode, a rotary shaft responsive to a switching action of the selection switch to change
the change-over switch, a display panel disposed adjacent the meter indicator and carrying a zero method index for use in the manual exposure mode and carrying an exposure factor scale for displaying the automatically determined exposure factor in the automatic exposure mode, and a carrier for supporting the display panel and responsive to movement of the selection switch to the automatic exposure mode position to slide to a first display position in which the zero method index and the scale are presented within the field of the viewfinder and responsive to movement of the selection switch to the manual exposure mode position to slide to a second display position in which the zero method index alone is presented within the field of the viewfinder.

2. A camera as claimed in claim I, in which the carrier is disposed adjacent a focusing screen located in the optical path of the viewfinder.

3. A camera as claimed in claim 1 or 2, in which the display panel comprises a sheet of a transparent material.

4. A camera as claimed in claim 1, 2 or 3, in which the rotary shaft has a cam integrally attached thereto, the cam having a first cam edge operative when the shaft is in an automatic exposure mode position and a second cam edge operative when the shaft is in a manual exposure mode position, the respective cam edges being effective to cause sliding movement of the carrier.

5. A camera as claimed in claim 4, in which the cam and the carrier are interconnected by a rocking arm having a first pin which is adapted to bear against the cam edges and a second pin which is caught by the carrier.

6. A camera having an exposure indicator for automatic and manual exposure modes, constructed and arranged and adapted to operate substantially as hereinbefore particularly described with reference to and as illustrated in the accompanying drawings.

GB45875/76A
1975-11-06
1976-11-04
Cameras

Expired

GB1569118A
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

JP1975150857U

JPS5628577Y2
(en)

1975-11-06
1975-11-06

Publications (1)

Publication Number
Publication Date

GB1569118A
true

GB1569118A
(en)

1980-06-11

Family
ID=15505878
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB45875/76A
Expired

GB1569118A
(en)

1975-11-06
1976-11-04
Cameras

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JP
(1)

JPS5628577Y2
(en)

DE
(1)

DE2650561C3
(en)

FR
(1)

FR2331051A1
(en)

GB
(1)

GB1569118A
(en)

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Publication number
Priority date
Publication date
Assignee
Title

FR2531711A1
(en)

1982-08-13
1984-02-17
Rhone Poulenc Sante

NEW DERIVATIVES OF CEPHALOSPORINE, THEIR PREPARATION AND THE MEDICINAL PRODUCTS CONTAINING THEM

DD234488A1
(en)

1985-02-04
1986-04-02
Pentacon Dresden Veb

moving coil

Family Cites Families (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

JPS5344989Y2
(en)

1973-12-12
1978-10-27

1975

1975-11-06
JP
JP1975150857U
patent/JPS5628577Y2/ja
not_active
Expired

1976

1976-11-04
DE
DE2650561A
patent/DE2650561C3/en
not_active
Expired

1976-11-04
GB
GB45875/76A
patent/GB1569118A/en
not_active
Expired

1976-11-05
FR
FR7633523A
patent/FR2331051A1/en
active
Granted

Also Published As

Publication number
Publication date

JPS5628577Y2
(en)

1981-07-07

DE2650561C3
(en)

1979-10-11

DE2650561B2
(en)

1979-02-15

JPS5263036U
(en)

1977-05-10

FR2331051B1
(en)

1982-07-16

FR2331051A1
(en)

1977-06-03

DE2650561A1
(en)

1977-05-18

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