GB1331617A – Flash device for a camera
– Google Patents
GB1331617A – Flash device for a camera
– Google Patents
Flash device for a camera
Info
Publication number
GB1331617A
GB1331617A
GB5861170A
GB5861170A
GB1331617A
GB 1331617 A
GB1331617 A
GB 1331617A
GB 5861170 A
GB5861170 A
GB 5861170A
GB 5861170 A
GB5861170 A
GB 5861170A
GB 1331617 A
GB1331617 A
GB 1331617A
Authority
GB
United Kingdom
Prior art keywords
flash
circuit
transistor
camera
indicate
Prior art date
1969-12-09
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
GB5861170A
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.)
Canon Inc
Original Assignee
Canon Inc
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.)
1969-12-09
Filing date
1970-12-10
Publication date
1973-09-26
1969-12-09
Priority claimed from FR6942558A
external-priority
patent/FR2070561A5/fr
1970-02-18
Priority claimed from JP45013951A
external-priority
patent/JPS4817084B1/ja
1970-12-10
Application filed by Canon Inc
filed
Critical
Canon Inc
1973-09-26
Publication of GB1331617A
publication
Critical
patent/GB1331617A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
239000003990
capacitor
Substances
0.000
abstract
3
230000004048
modification
Effects
0.000
abstract
1
238000012986
modification
Methods
0.000
abstract
1
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
G03B15/00—Special procedures for taking photographs; Apparatus therefor
G03B15/02—Illuminating scene
G03B15/03—Combinations of cameras with lighting apparatus; Flash units
G03B15/05—Combinations of cameras with electronic flash apparatus; Electronic flash units
B—PERFORMING OPERATIONS; TRANSPORTING
B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
B01D—SEPARATION
B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
B01D53/34—Chemical or biological purification of waste gases
B01D53/46—Removing components of defined structure
B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
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
G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
G03B7/16—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly in accordance with both the intensity of the flash source and the distance of the flash source from the object, e.g. in accordance with the «guide number» of the flash bulb and the focusing of the camera
H—ELECTRICITY
H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
H05B41/14—Circuit arrangements
H05B41/30—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp
H05B41/32—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp for single flash operation
Abstract
1331617 Flash photography CANON K K 10 Dec 1970 [10 Dec 1969 14 Jan 1970 18 Feb 1970(2) 20 Feb 1970] 58611/70 Heading G2A The combination of an electronic flash unit and a camera has an indicator circuit which indicates an inoperative condition when either the flash circuit Fc is not able to illuminate the flash discharge tube LF, e. g. insufficient voltage across the discharge capacitor 4, and/or the photographic settings on the camera are not appropriate for flash photography, e.g. incorrect setting of the diaphragm, shutter speed and distance, and also indicates an operative condition when both of these conditions are met. An oscillator circuit OF has its output connected via capacitor 35 to an ammeter 36 whose pointer thus oscillates to indicate an inoperative condition. The oscillator stops oscillating only when a transistor 30 is rendered conductive and this results only if a switch SW 2 is closed as the result of the setting of the camera appropriate for flash photography and if the voltage on discharge capacitor 4 is sufficient to cause lamp 2 to glow so that the base voltage of transistor 30 permits conduction therethrough. In a modification of this embodiment, Fig. 2 (not shown), the switch SW 2 is replaced by a changeover switch, and the transistor 30 is powered from its own independent current supply (40). In a further embodiment, Figs.3 and 4 (not shown), the photometric measuring circuit formed by 9′ and 36 is replaced by an indicator lamp (45) in the collector circuit of a transistor (44), the lamp flashing to indicate the inoperative condition and emitting steady light to indicate the operative condition. A time-constant circuit may be provided to control the time of triggering of a flash by-pass tube under the control of detected light, Figs. 5, 7-10 (not shown).
GB5861170A
1969-12-09
1970-12-10
Flash device for a camera
Expired
GB1331617A
(en)
Applications Claiming Priority (6)
Application Number
Priority Date
Filing Date
Title
FR6942558A
FR2070561A5
(en)
1969-12-09
1969-12-09
JP11791469
1969-12-10
JP455570
1970-01-14
JP45013951A
JPS4817084B1
(en)
1970-02-18
1970-02-18
JP1395270
1970-02-18
JP1462870
1970-02-20
Publications (1)
Publication Number
Publication Date
GB1331617A
true
GB1331617A
(en)
1973-09-26
Family
ID=27546317
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB5861170A
Expired
GB1331617A
(en)
1969-12-09
1970-12-10
Flash device for a camera
Country Status (2)
Country
Link
US
(1)
US3688664A
(en)
GB
(1)
GB1331617A
(en)
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2235055A
(en)
*
1989-07-17
1991-02-20
Asahi Optical Co Ltd
Indicating apparatus in finder of camera
Families Citing this family (16)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3774072A
(en)
*
1971-01-22
1973-11-20
Honeywell Inc
Remotely powered quench control sensing transmitter
JPS4890228A
(en)
*
1972-02-28
1973-11-24
DE2514192B2
(en)
*
1974-04-01
1979-08-09
Canon K.K., Tokio
Camera system, consisting of camera and flash unit
JPS5516253Y2
(en)
*
1974-04-09
1980-04-16
US4047194A
(en)
*
1974-05-08
1977-09-06
Canon Kabushiki Kaisha
Camera system with means for automatically switching to flash operation
GB1507505A
(en)
*
1974-05-16
1978-04-19
West Electric Co
Flash guns
JPS50156932A
(en)
*
1974-06-07
1975-12-18
US4187019A
(en)
*
1974-10-29
1980-02-05
Canon Kabushiki Kaisha
Flash light photographic systems
US4078242A
(en)
*
1974-10-29
1978-03-07
Canon Kabushiki Kaisha
Flash light photographic systems
JPS51117624A
(en)
*
1975-04-08
1976-10-15
Canon Inc
Flashlight unit warning circuit
US4007469A
(en)
*
1975-04-21
1977-02-08
Polaroid Corporation
Photographic apparatus with plurality of selectively determinable operational modes
JPS52161644U
(en)
*
1976-06-01
1977-12-07
JPS5317331A
(en)
*
1976-07-30
1978-02-17
Minolta Camera Co Ltd
Controlling circuit of camera in response to signal from strobo firing device
JPS53109628A
(en)
*
1977-03-05
1978-09-25
Nippon Chemical Ind
Indication device for camera
US4199236A
(en)
*
1977-07-22
1980-04-22
Nippon Kogaku K.K.
Synchronizing speed warning apparatus for camera
JPS5962842A
(en)
*
1982-10-04
1984-04-10
Canon Inc
Display device of camera
Family Cites Families (4)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE1208184B
(en)
*
1963-12-21
1965-12-30
Voigtlaender Ag
Photographic camera with built-in electronic flash unit
DE1472663A1
(en)
*
1964-10-27
1969-04-24
Yashica Co Ltd
Automatic exposure time controller with display of exposure brightness limits
US3522763A
(en)
*
1967-01-25
1970-08-04
Polaroid Corp
Exposure control apparatus
US3568582A
(en)
*
1967-09-27
1971-03-09
Konishiroku Photo Ind
Electronic shutter
1970
1970-12-04
US
US95290A
patent/US3688664A/en
not_active
Expired – Lifetime
1970-12-10
GB
GB5861170A
patent/GB1331617A/en
not_active
Expired
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2235055A
(en)
*
1989-07-17
1991-02-20
Asahi Optical Co Ltd
Indicating apparatus in finder of camera
Also Published As
Publication number
Publication date
US3688664A
(en)
1972-09-05
Similar Documents
Publication
Publication Date
Title
GB1331617A
(en)
1973-09-26
Flash device for a camera
GB1145296A
(en)
1969-03-12
Improvements in or relating to electronic flash apparatus for use in photography
GB1225917A
(en)
1971-03-24
GB1212687A
(en)
1970-11-18
Photographic or cinematographic camera having electrical apparatus requiring a predetermined voltage for correct operation
US3273478A
(en)
1966-09-20
Photographic camera with built-in electronic flash device
US2458882A
(en)
1949-01-11
Timing device for high-speed motionpicture cameras
GB1132771A
(en)
1968-11-06
Photographic camera
US3232191A
(en)
1966-02-01
Low-scene-brightness signal for photographic cameras
GB1205272A
(en)
1970-09-16
Photographic camera with an automatic exposure regulating means for controlling the exposure time
GB1326060A
(en)
1973-08-08
Flash device for a camera
GB1271598A
(en)
1972-04-19
Improvements in or relating to automatic exposure cameras
GB1348711A
(en)
1974-03-20
Camera which has built in or attachable flash apparatus
US3545870A
(en)
1970-12-08
Photometric apparatus incorporating light responsive transistorized switching circuit
US3919593A
(en)
1975-11-11
Flash safety device in a flash apparatus
US3812504A
(en)
1974-05-21
Indicator arrangement for a photographic camera
US3690229A
(en)
1972-09-12
Exposure control apparatus for photographic cameras
US4176933A
(en)
1979-12-04
Indicating apparatus for camera
US4494852A
(en)
1985-01-22
Photoflash detector
GB1217526A
(en)
1970-12-31
Photographic camera having exposure time control and indicating means
JPS5730820A
(en)
1982-02-19
Strobe tuning device
GB1316633A
(en)
1973-05-09
Exposure control arrangement
US3495515A
(en)
1970-02-17
Photoelectric measuring devices
GB1268246A
(en)
1972-03-22
Photographic camera having an electromagnetic exposure control
GB1110189A
(en)
1968-04-18
Improvements relating to photometric apparatus
US3661062A
(en)
1972-05-09
Test circuit for photographic cameras
Legal Events
Date
Code
Title
Description
1974-02-06
PS
Patent sealed [section 19, patents act 1949]
1991-01-09
PE20
Patent expired after termination of 20 years
