JPS5688126A - Speed light device - Google Patents
Speed light deviceInfo
- Publication number
- JPS5688126A JPS5688126A JP16566179A JP16566179A JPS5688126A JP S5688126 A JPS5688126 A JP S5688126A JP 16566179 A JP16566179 A JP 16566179A JP 16566179 A JP16566179 A JP 16566179A JP S5688126 A JPS5688126 A JP S5688126A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- photometric
- dimming
- signal
- light
- Prior art date
- 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
Links
Landscapes
- Exposure Control For Cameras (AREA)
- Stroboscope Apparatuses (AREA)
Abstract
PURPOSE: To prevent the waste of films by such constitution in which a correcting circuit changing-over the photometric sensitivity of a TTL photometric circuit in cooperation with test light emission is provided in a manner as to provide the same measuring conditions as those of film plane photometry in the ordinary photometric state of a speed light device and an automatic dimming device displays whether dimming is possible or not.
CONSTITUTION: The image pickup light past an image pickup lens 2 passes the semitransparent part of a return mirror 5, is reflected by a mirror 6 and enters a photoelectric element 7. The output 21 thereof is sent to the photometric circuit 12 of an automatic dimming circuit 11. Additionally, an aperture signal 22 is held inputted to the photometric circuit 12. When a test switch 15 is closed, a control circuit 14 oututs the light emission of a flash discharge tube 13 and the correction signal 24 making the correction of the photometric sensitivity to the automatic dimming circuit 11. An alarm display circuit 16 receives the start signal 23 and the stop signal 25 by the results of the photometric operation of the photometric circuit 12, and when out of the dimming range, it emits an alarm by flickering a light emitting diode 17. The operation at the photographing is accomplished by a known method. Hence, the waste of the film is prevented.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16566179A JPS5688126A (en) | 1979-12-21 | 1979-12-21 | Speed light device |
US06/215,345 US4359275A (en) | 1979-12-21 | 1980-12-11 | Single lens reflex camera system capable of TTL flash output control |
GB8040664A GB2067773A (en) | 1979-12-21 | 1980-12-18 | Single lens reflex camera system capable of ttl flash output control |
DE19803048136 DE3048136A1 (en) | 1979-12-21 | 1980-12-19 | CAMERA SYSTEM WITH TTL CONTROL OF THE FLASH LIGHT |
FR8027083A FR2472202A1 (en) | 1979-12-21 | 1980-12-19 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16566179A JPS5688126A (en) | 1979-12-21 | 1979-12-21 | Speed light device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5688126A true JPS5688126A (en) | 1981-07-17 |
JPH0146857B2 JPH0146857B2 (en) | 1989-10-11 |
Family
ID=15816604
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16566179A Granted JPS5688126A (en) | 1979-12-21 | 1979-12-21 | Speed light device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5688126A (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52150026A (en) * | 1976-06-08 | 1977-12-13 | Canon Inc | Automatic exposure control camera |
JPS5319072U (en) * | 1976-07-24 | 1978-02-18 | ||
JPS5540413A (en) * | 1978-09-15 | 1980-03-21 | Olympus Optical Co Ltd | Test light emitting device of ttl control strobe |
-
1979
- 1979-12-21 JP JP16566179A patent/JPS5688126A/en active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52150026A (en) * | 1976-06-08 | 1977-12-13 | Canon Inc | Automatic exposure control camera |
JPS5319072U (en) * | 1976-07-24 | 1978-02-18 | ||
JPS5540413A (en) * | 1978-09-15 | 1980-03-21 | Olympus Optical Co Ltd | Test light emitting device of ttl control strobe |
Also Published As
Publication number | Publication date |
---|---|
JPH0146857B2 (en) | 1989-10-11 |
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