JPS55135823A - Flash electric discharge lamp dimming device - Google Patents
Flash electric discharge lamp dimming deviceInfo
- Publication number
- JPS55135823A JPS55135823A JP4404479A JP4404479A JPS55135823A JP S55135823 A JPS55135823 A JP S55135823A JP 4404479 A JP4404479 A JP 4404479A JP 4404479 A JP4404479 A JP 4404479A JP S55135823 A JPS55135823 A JP S55135823A
- Authority
- JP
- Japan
- Prior art keywords
- subject
- discharge lamp
- information
- photometric
- electric discharge
- 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.)
- Pending
Links
Landscapes
- Exposure Control For Cameras (AREA)
- Stroboscope Apparatuses (AREA)
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
Abstract
PURPOSE:To obtain the correct exposure for the desired subject by obtaining the photometric information with respect to plural regions or plural points and comparing the same with references. CONSTITUTION:Photo diodes 11-15 for the split regions (a)-(e) of the subject are connected to an analog multiplexer 41, control signal generator 42, AD converter 45, gate 46, registers 51-55, 61-64, comparators 71-75, maximum value detecting circuit 47 and gate circuit 48. The photometric information relating to the split regions (a)-(e) having been obtained through the photo diodes 11-15 is compared with the photometric values having been obtained under uniform light or external lighting and under flash discharge lamp lighting, respectively. Thereby, the information removed of the effect of the reflectance, etc. of the subject is obtained and if this information is fed to the control circuit of the flash discharge lamp device through terminals t1-t4, then the correct exposure is obtainable for the subject.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4404479A JPS55135823A (en) | 1979-04-10 | 1979-04-10 | Flash electric discharge lamp dimming device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4404479A JPS55135823A (en) | 1979-04-10 | 1979-04-10 | Flash electric discharge lamp dimming device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55135823A true JPS55135823A (en) | 1980-10-23 |
Family
ID=12680612
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4404479A Pending JPS55135823A (en) | 1979-04-10 | 1979-04-10 | Flash electric discharge lamp dimming device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55135823A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60164730A (en) * | 1984-02-06 | 1985-08-27 | Fuji Photo Film Co Ltd | Auto focus camera having back light detecting type stroboscope |
JPS61215537A (en) * | 1985-03-19 | 1986-09-25 | Minolta Camera Co Ltd | Flash dimmer |
JPS61171615U (en) * | 1985-04-13 | 1986-10-24 | ||
JPS6290633A (en) * | 1985-10-17 | 1987-04-25 | Minolta Camera Co Ltd | Flash photography device |
JPH0413934U (en) * | 1990-05-28 | 1992-02-04 | ||
JPH10319468A (en) * | 1997-05-23 | 1998-12-04 | Nikon Corp | Camera |
US7345702B2 (en) | 2000-02-07 | 2008-03-18 | Canon Kabushiki Kaisha | Image sensing apparatus, control method for illumination device, flash photographing method, and computer program product |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5341972A (en) * | 1976-09-29 | 1978-04-15 | Hitachi Ltd | Exhauster for vacuum tube production |
-
1979
- 1979-04-10 JP JP4404479A patent/JPS55135823A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5341972A (en) * | 1976-09-29 | 1978-04-15 | Hitachi Ltd | Exhauster for vacuum tube production |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60164730A (en) * | 1984-02-06 | 1985-08-27 | Fuji Photo Film Co Ltd | Auto focus camera having back light detecting type stroboscope |
JPH0527846B2 (en) * | 1984-02-06 | 1993-04-22 | Fuji Photo Film Co Ltd | |
JPS61215537A (en) * | 1985-03-19 | 1986-09-25 | Minolta Camera Co Ltd | Flash dimmer |
JPS61171615U (en) * | 1985-04-13 | 1986-10-24 | ||
JPS6290633A (en) * | 1985-10-17 | 1987-04-25 | Minolta Camera Co Ltd | Flash photography device |
JPH0413934U (en) * | 1990-05-28 | 1992-02-04 | ||
JPH10319468A (en) * | 1997-05-23 | 1998-12-04 | Nikon Corp | Camera |
US7345702B2 (en) | 2000-02-07 | 2008-03-18 | Canon Kabushiki Kaisha | Image sensing apparatus, control method for illumination device, flash photographing method, and computer program product |
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