GB2031173A – Shuter speed priority lens barrel mount
– Google Patents
GB2031173A – Shuter speed priority lens barrel mount
– Google Patents
Shuter speed priority lens barrel mount
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Info
Publication number
GB2031173A
GB2031173A
GB7931510A
GB7931510A
GB2031173A
GB 2031173 A
GB2031173 A
GB 2031173A
GB 7931510 A
GB7931510 A
GB 7931510A
GB 7931510 A
GB7931510 A
GB 7931510A
GB 2031173 A
GB2031173 A
GB 2031173A
Authority
GB
United Kingdom
Prior art keywords
lens
camera body
recess
mount portion
signal
Prior art date
1978-09-13
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.)
Granted
Application number
GB7931510A
Other versions
GB2031173B
(en
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.)
Nikon Corp
Original Assignee
Nippon Kogaku KK
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.)
1978-09-13
Filing date
1979-09-11
Publication date
1980-04-16
1979-09-11
Application filed by Nippon Kogaku KK
filed
Critical
Nippon Kogaku KK
1980-04-16
Publication of GB2031173A
publication
Critical
patent/GB2031173A/en
1982-08-18
Application granted
granted
Critical
1982-08-18
Publication of GB2031173B
publication
Critical
patent/GB2031173B/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
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Discuss
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
G03B17/02—Bodies
G03B17/12—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets
G03B17/14—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets interchangeably
Description
1 GB 2 031 173 A 1
SPECIFICATION
Lens barrel for both priorities or shutter speed priority mode automatic exposure system Background of the invention
Field of the invention
This invention relates to a lens barrel having at least a shutter speed priority automatic exposure system to be mounted on a camera body having at least a function of shutter speed priority automatic exposure system.
Description of the prior art
There has been a lens barrel of an aperture priority automatic exposure (AE) system and shutter speed priority automatic exposure system which automa tically controls a shutter speed in response to a preset aperture value, or a lens barrel of a shutter speed priority automatic exposure system which automatically controls an aperture value in response to a preset shutter speed, or both priorities automa tic exposure system, which provides with both functions of aperture priority AE system and which enables to selectively use the either system. 90 When a lens barrel of an aperture priority AE system is mounted on a camera body of a shutter speed priority AE system or of both priorities AE system which equips with a shutter speed priority AE function and is operated so as to phototaking under shuttter speed AE mode, it is not possible to make an appropriate phototaking. For enabling this operation, it is considered to provide at the side of camera body a signal member which is actuated when a lens barrel of aperture priority AE system is mounted so as to transmit a signal to a control system of camera body to the effect that such type of lens barrel is mounted. However, if a camera body is constituted in such a way as mentioned, and when a lens barrel of shutter speed priority AE system or of both priorities AE system is mounted on such camera body, there has been a problem to transmit a signal which shows that the mounted lens barrel is not of aperture priority AE system.
Summary of the invention
This invention overcomes said defect and presents a lens barrel for a shutter speed priority ae system or both priorities AE system which prevents the actua tion of a signal member provided on a camera body having the function of shutter speed priority AE system.
This invention presents a phototaking lens having at least a function of shutter speed priority AE system and having a mount engageable with a 120 mount of a camera body having at least a function of shutter speed priority AE system and the camera body includes a signal member operable when said phototaking lens is mounted on the mount of the camera body and control means for displaying a caution and/or for stopping the operation of the camera in response to the output of said signal member. The characteristic feature of this invention resides in the provision of means for preventing the operation of the signal member, the preventing 130 means being disposed on the lens mount in such a mannerthat when the lens mount is engaged with the mount of the camera body, the preventing means faces the signal member.
Brief description of the drawings
Figure 1 is a front view of a mount of a camera body of both priorities AE system, Figure 2 is a front view of a mount of a lens barrel for both priorities or shutter speed priority AE mode.
Figure 3 shows a partially enlarged cross section representing the state where the mount of the lens barrel is engaged with the mount of the camera body.
Figure 4 shows a,.-ross section showing the shape of a. recess.
Figure 5 shows a ross section of another shape of a recess and Figure 6 shows a 3ross section of further shape of a recess.
Description of the preferred embodiment
As shown in the crawings, which show an embodiment of this invention, on mount 1 of a camera body, mount engaging pawl la, recess 1 b and mount reference surface 1c are formed, and lens mounting positioning pin 2 and discriminating pin 3 as a signal member are spaced apart by an angle 0 with each other.
In Figure 3, which shows that the mount of lens barrel is engaged with a mount of camera body, a member 5 for retaining the pin 3 is fixed at camera body 4 and spring 6 is provided between the member 5 and the pin 3 for biasing the pin 3 upwardly, and at the lower end of the pin 3 there is an insulating member 7. Switch SW is opened as insulating member 7 moves downwardly and is connected to control means 20. The control means 20 is operated only when OFF signal of switch SW and shutter speed priority mode selecting signal S which is obtained from a not-shown mode switching means provided at camera body are coming in and it activate caution means 21 effecting caution display and/or stop of the operation of the camera.
In Figure 2, at lens barrel mount 9, mount engaging pawl 9a as shown in Figure 3 is provided projecting from the surface 9b, and mount reference surfaces 9c and 9e and the surface 9d, which is lower than the reference surface by a small amount, are formed, respectively. Mount 9 has a groove-shaped recess 9f which receives the discriminating pin 3 by the force of spring 6 and lens mounting positioning groove 9g engageable with the positioning pin 2. The mount 9 is surrounded by outer shell 10.
The recess 9f is worked under the condition of that it forms right angle against line rs and it is provided on the locus of the pin 3 on the camera body. The line rs is formed by connecting the center S of the mount 9 and the position r which is approximately the center, when the pin 2 and the groove 9g are engaged, of the position p where the pin 3 stops and the point q which is the start point of the recess 9f.
Next, the operation is explained hereinafter.
Mount engaging pawl 9a of the lens barrel is inserted into the recess 1 b of the camera body. As 2 GB 2 031 173 A 2 the lens barrel is rotated counterclockwisely as shown in Figure 1 by the arrow, the enginging paw[ 9a engageswith mount engaging paw[ la of the camera body and the positioning groove 9a faces the pin 2 of the camera body, the pin 2 fails into the groove 9g to form conventional bayonet coupling.
Simultaneously with the failing of the pin 2 into the groove 9g, the pin 3 fails into the recess 9f with the aid of the upward biasing of spring 6 (Figure 3), and switch SW is turned to be closed (the real line in Figure 3). The control means 20 connected to switch SW is actuated, as explained in the foregoing, only when the switch is in OFF state and shutter speed priority mode is set. Thus when said lens barrel of the structure in which the switch is always turned to 80 ON state by the failing engagement of the pin 3 with the recess 9f, is mounted on a camera body of both priority AE system, the control means 20 is not operated in either shutter speed priority mode or aperture priority mode.
Consequently, when the lens barrel of this inven tion used for both priorities or shutter speed priority mode is engaged with the camera of both priorities AE system, appropriate exposure phototaking is performed in either mode of aperture priority or shutter speed priority.
Next, the explanation will be made for the case in which the lens barrel which has been used for the conventional aperture priority AE system camera is mounted on a camera of both priorities AE system.
In this conventional aperture priority mode lens barrel, the recess 9f of this invention is not provided.
Thus when the engaging pawl engages with mount engaging pawl and the pin 2 of the camera body fails in the groove 99 of the lens barrel, switch SW is in the OFF state by the pin 3 as shown by the broken line in Figure 3. In this OFF state and the camera body is set to shutter speed priority mode, the control means 20 will be operated as explained before. Therefore, the control means 20 actuates caution means 21, and in the case that the switch connected in series with the electric source of a camera of electro-magnetic release control type is turned to OFF, the release is prevented and the phototaking is not realized, and in the case where the 110 caution is displayed, the display element is turned on to notice that conventional aperture priority system lens barrel is mounted. However, if the aperture priority mode of camera body is selected, appropriate exposure phototaking is realized in that mode.
In the above mentioned embodiment, the shape of the recess provided at the lens barrel is as shown in Figure 4. In this case, the recess if formed by curved surface having two centres t, u, of the same radius R so that the edges have gentle slope and it is very easy to dismount the lens barrel by rotating it clockwisely to disengage the pin 3 from the recess 9f.
Instead of the recess in Figure 4, a recess having a cross-sectional view of Figure 5 can be used. This recess 9f’ is formed by a curved surface having one centre V of the radius W.
In the embodiments of the recess explained in the foregoing, they are provided in the linear form. The recess W shown in Figure 6 is formed in a circular shape having its centre at the optical axis of the lens. In this shape of the recess, when the engaging pawl of the lens is inserted into the recess of the camera body, the discriminating pin 3 is in the position 3a’ and when the positioning pin fails into the positioning groove the discriminating pin 3 comes to the position 3J.
Although the explanation has been made for the camera body of both priorities system, it is nothing to say that the present invention can be applicable to a camera body of shutter speed priority system.
Claims (5)
1. A phototaking lens having amount portion engageable with a mount portion of a camera body for mounting said mount portion of the lens and at least a function of a shutter speed priority automatic exposure system, said camera body having at least a shutter speed priority automatic exposure system and a signal membE – operable when the lens is engaged with the m junt portion of the camera body, and a control meaw, to display a caution and/or to stop the camera oporation in response to the output of the signal member, the improvement which comprises a means ‘or preventing the operation of the signal member provided at the mount portion of the lens, the preventing means being faced the signal member when the mount portion of the lens is engaged with the mount portion of the camera body.
2. A phototaking lens according to claim 1, wherein the signal member comprises a retractable signal pin projectec from the mount portion of the camera body and tl e preventing means comprises recess on the mount portion of the lens receivable the projecting portion of the signal pin.
3. A phototaking lens according to claim 2, wherein said recess is formed on a locus of the signal pin when the lens is mounted onto the camera body and is formed by a straight groove forming at right angle to a line connecting the optical axis of the lens and a position which is substantially the centre between a position when the recess faces the projecting end of the signal pin upon completion of mounting operatioi of the lens to the camera body and a position which is one end of the recess where the signal pin centres when the lens is mounted to the camera body.
4. A phototaking lens according to claim 2, wherein said recess is a groove formed in a circular shape having its centre at the optical of the lens.
5. A phototaking lens substantially as hereinbefore described with reference to the accompanying drawings.
Printed for Her Majesty’s Stationery Office by Croydon Printing Company Limited, Croydon Surrey, 1980. Published bythePatent Office, 25 Southampton Buildings, London,WC2A lAY, from which copies may be obtained.
1
GB7931510A
1978-09-13
1979-09-11
Shuter speed priority lens barrel mount
Expired
GB2031173B
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
JP1978124799U
JPS6235062Y2
(en)
1978-09-13
1978-09-13
Publications (2)
Publication Number
Publication Date
GB2031173A
true
GB2031173A
(en)
1980-04-16
GB2031173B
GB2031173B
(en)
1982-08-18
Family
ID=14894406
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB7931510A
Expired
GB2031173B
(en)
1978-09-13
1979-09-11
Shuter speed priority lens barrel mount
Country Status (5)
Country
Link
US
(1)
US4269497A
(en)
JP
(1)
JPS6235062Y2
(en)
DE
(1)
DE2936876C2
(en)
FR
(1)
FR2436411A1
(en)
GB
(1)
GB2031173B
(en)
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2249186A
(en)
*
1990-10-03
1992-04-29
Asahi Optical Co Ltd
Interchangeable lens camera
Families Citing this family (10)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
JPS6131321Y2
(en)
*
1980-10-30
1986-09-11
JPS57204014A
(en)
*
1981-06-10
1982-12-14
Olympus Optical Co Ltd
Switching device for focusing photodetecting element
US4464034A
(en)
*
1981-11-13
1984-08-07
Nippon Kogaku K.K.
Device for electrically connecting lens and camera
US5311245A
(en)
*
1982-03-26
1994-05-10
Minolta Camera Kabushiki Kaisha
Camera system operable by carrying data from a camera accessory to a camera body
JPS6095518A
(en)
*
1983-10-31
1985-05-28
Nippon Kogaku Kk
Setting device for exposure control mode of camera
JPH0769565B2
(en)
*
1984-07-23
1995-07-31
ミノルタ株式会社
Camera system and lens structure
JPS6238437A
(en)
*
1985-08-13
1987-02-19
Nippon Kogaku Kk
Camera
JPS6267522A
(en)
*
1985-09-20
1987-03-27
Nippon Kogaku Kk
Controller for diaphragm of camera
JP2010019375A
(en)
*
2008-07-11
2010-01-28
Kaaz Corp
Connection isolation structure of rotating shaft and output shaft of engine
JP5896635B2
(en)
*
2011-07-20
2016-03-30
キヤノン株式会社
Lens unit
Family Cites Families (8)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
JPS5144652B1
(en)
*
1971-04-16
1976-11-30
JPS5539812B2
(en)
*
1972-02-08
1980-10-14
JPS4949926U
(en)
*
1972-11-02
1974-05-01
JPS5423305Y2
(en)
*
1973-02-13
1979-08-10
JPS5323487Y2
(en)
*
1973-10-19
1978-06-17
DE2551544A1
(en)
*
1975-11-17
1977-05-26
Zeiss Carl Fa
PHOTO CAPTURE DEVICE WITH INTERCHANGEABLE LENS
DE7625870U1
(en)
*
1976-08-18
1976-12-02
Agfa-Gevaert Ag, 5090 Leverkusen
CAMERA WITH A VARIO LENS
DE2640514C3
(en)
*
1976-09-09
1979-02-22
Rollei-Werke Franke & Heidecke, 3300 Braunschweig
Photographic camera with interchangeable lens and blender display in the viewfinder
1978
1978-09-13
JP
JP1978124799U
patent/JPS6235062Y2/ja
not_active
Expired
1979
1979-09-07
US
US06/073,423
patent/US4269497A/en
not_active
Expired – Lifetime
1979-09-11
GB
GB7931510A
patent/GB2031173B/en
not_active
Expired
1979-09-12
DE
DE2936876A
patent/DE2936876C2/en
not_active
Expired
1979-09-12
FR
FR7922791A
patent/FR2436411A1/en
active
Granted
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2249186A
(en)
*
1990-10-03
1992-04-29
Asahi Optical Co Ltd
Interchangeable lens camera
Also Published As
Publication number
Publication date
FR2436411B1
(en)
1985-02-08
FR2436411A1
(en)
1980-04-11
JPS5542807U
(en)
1980-03-19
DE2936876C2
(en)
1986-07-03
DE2936876A1
(en)
1980-04-03
GB2031173B
(en)
1982-08-18
JPS6235062Y2
(en)
1987-09-07
US4269497A
(en)
1981-05-26
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Legal Events
Date
Code
Title
Description
1989-05-04
PCNP
Patent ceased through non-payment of renewal fee
