JPS55135823A - Flash electric discharge lamp dimming device - Google Patents

Flash electric discharge lamp dimming device

Info

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
Application number
JP4404479A
Other languages
Japanese (ja)
Inventor
Tokuji Ishida
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.)
Minolta Co Ltd
Original Assignee
Minolta 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.)
Filing date
Publication date
Application filed by Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP4404479A priority Critical patent/JPS55135823A/en
Publication of JPS55135823A publication Critical patent/JPS55135823A/en
Pending legal-status Critical Current

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.
JP4404479A 1979-04-10 1979-04-10 Flash electric discharge lamp dimming device Pending JPS55135823A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5341972A (en) * 1976-09-29 1978-04-15 Hitachi Ltd Exhauster for vacuum tube production

Patent Citations (1)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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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