JPS5741625A - Power source circuit of flash device - Google Patents

Power source circuit of flash device

Info

Publication number
JPS5741625A
JPS5741625A JP55117270A JP11727080A JPS5741625A JP S5741625 A JPS5741625 A JP S5741625A JP 55117270 A JP55117270 A JP 55117270A JP 11727080 A JP11727080 A JP 11727080A JP S5741625 A JPS5741625 A JP S5741625A
Authority
JP
Japan
Prior art keywords
voltage
capacitor
converter
load
power source
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
Application number
JP55117270A
Other languages
Japanese (ja)
Other versions
JPH0258611B2 (en
Inventor
Yoshiharu Ota
Masayasu Hirano
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 JP55117270A priority Critical patent/JPS5741625A/en
Publication of JPS5741625A publication Critical patent/JPS5741625A/en
Publication of JPH0258611B2 publication Critical patent/JPH0258611B2/ja
Granted legal-status Critical Current

Links

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
    • 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
    • G03B2215/00—Special procedures for taking photographs; Apparatus therefor
    • G03B2215/05—Combinations of cameras with electronic flash units

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Electrical Variables (AREA)
  • Dc-Dc Converters (AREA)
  • Stroboscope Apparatuses (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)

Abstract

PURPOSE:To prevent power consumption and to secure the operation of a load by exercising oscillation control by adding a voltage monitoring circuit to either one of two outputs of a DC-DC converter having a larger load. CONSTITUTION:As a DC-DC converter consisting of an oscillation transistor TR1, a primary coil P, a high-voltage secondary coil SH, a low-voltage secondary coil, and a feedback coil F oscillates, a main capacitor CH and a power capacitor CL for a camera control circuit are charged, respectively. The charging voltage of the capacitor CL is detected by a monitoring circuit encircled with a chain line to control the oscilltions of the DC-DC converter and then the voltage of the capacitor CL is adjusted to prescribed width. The voltage of the main capacitor, on the other hand, has the prescribed width and less eventually because the low-voltage load is greater than the high-voltage one.
JP55117270A 1980-08-25 1980-08-25 Power source circuit of flash device Granted JPS5741625A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55117270A JPS5741625A (en) 1980-08-25 1980-08-25 Power source circuit of flash device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55117270A JPS5741625A (en) 1980-08-25 1980-08-25 Power source circuit of flash device

Publications (2)

Publication Number Publication Date
JPS5741625A true JPS5741625A (en) 1982-03-08
JPH0258611B2 JPH0258611B2 (en) 1990-12-10

Family

ID=14707593

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55117270A Granted JPS5741625A (en) 1980-08-25 1980-08-25 Power source circuit of flash device

Country Status (1)

Country Link
JP (1) JPS5741625A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012105209A1 (en) * 2011-02-01 2012-08-09 旭化成エレクトロニクス株式会社 Led flash-generating device and led flash-generating method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4847329A (en) * 1971-10-15 1973-07-05
JPS5473030A (en) * 1977-11-22 1979-06-12 Minolta Camera Co Ltd Camera with automatic focus control device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4847329A (en) * 1971-10-15 1973-07-05
JPS5473030A (en) * 1977-11-22 1979-06-12 Minolta Camera Co Ltd Camera with automatic focus control device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012105209A1 (en) * 2011-02-01 2012-08-09 旭化成エレクトロニクス株式会社 Led flash-generating device and led flash-generating method
JPWO2012105209A1 (en) * 2011-02-01 2014-07-03 旭化成エレクトロニクス株式会社 LED flash generation device and LED flash generation method

Also Published As

Publication number Publication date
JPH0258611B2 (en) 1990-12-10

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