JPS5652737A - Strobe circuit - Google Patents

Strobe circuit

Info

Publication number
JPS5652737A
JPS5652737A JP12965279A JP12965279A JPS5652737A JP S5652737 A JPS5652737 A JP S5652737A JP 12965279 A JP12965279 A JP 12965279A JP 12965279 A JP12965279 A JP 12965279A JP S5652737 A JPS5652737 A JP S5652737A
Authority
JP
Japan
Prior art keywords
trq
goes
power supply
circuit
switches
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
JP12965279A
Other languages
Japanese (ja)
Inventor
Tadashi Okino
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.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP12965279A priority Critical patent/JPS5652737A/en
Priority to US06/193,458 priority patent/US4306281A/en
Priority to DE19803037863 priority patent/DE3037863A1/en
Publication of JPS5652737A publication Critical patent/JPS5652737A/en
Pending legal-status Critical Current

Links

Landscapes

  • Details Of Cameras Including Film Mechanisms (AREA)
  • Stroboscope Apparatuses (AREA)
  • Dc-Dc Converters (AREA)

Abstract

PURPOSE: To decrease the number of mechanical switches in a camera built in with a winding motor by providing a circuit element which surely disables the oscillation of an oscillating transistor to said transistor.
CONSTITUTION: A circuit element Z which increases the apparent base-emitter voltage of an oscillating transistor TRQ1 is provided to hold the TRQ1 surely in an OFF state. When a switch SW1 is turned ON, the electric charging to a main capacitor C2 is started by the oscillation operation of the TRQ1. Since at this time the switches SW3, SW2 are both OFF, the electric power is used for the strobe circuit only. Next, when release is operated, the switch SW3 goes ON and the power supply to a photographing control circuit CC is accomplished; at the same time the TRQ1 goes off to stop the power supply to the strobe circuit. When flash photographing ends in succession to this, the SW3 goes OFF and the SW2 goes ON to supply the power to the winding motor. Since the element Z is provided in this way, the power supply may be controlled accurately time serially with a less number of switches.
COPYRIGHT: (C)1981,JPO&Japio
JP12965279A 1979-10-08 1979-10-08 Strobe circuit Pending JPS5652737A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP12965279A JPS5652737A (en) 1979-10-08 1979-10-08 Strobe circuit
US06/193,458 US4306281A (en) 1979-10-08 1980-10-03 DC-DC Converter for electronic flash unit
DE19803037863 DE3037863A1 (en) 1979-10-08 1980-10-07 DC / DC CONVERTER FOR ELECTRIC FLASH UNITS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12965279A JPS5652737A (en) 1979-10-08 1979-10-08 Strobe circuit

Publications (1)

Publication Number Publication Date
JPS5652737A true JPS5652737A (en) 1981-05-12

Family

ID=15014803

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12965279A Pending JPS5652737A (en) 1979-10-08 1979-10-08 Strobe circuit

Country Status (1)

Country Link
JP (1) JPS5652737A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57130827U (en) * 1981-02-06 1982-08-14
JPS62152719A (en) * 1985-12-26 1987-07-07 Sekisui Plastics Co Ltd Method of forming foamed sheet and device thereof
EP0364355A2 (en) * 1988-10-11 1990-04-18 Sony Corporation Spindle servo control for electronic still camera
US6434027B1 (en) 1998-03-11 2002-08-13 Murata Manufacturing Co., Ltd. Switching power supply having a plurality of output voltages and minimal number of terminals

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57130827U (en) * 1981-02-06 1982-08-14
JPS62152719A (en) * 1985-12-26 1987-07-07 Sekisui Plastics Co Ltd Method of forming foamed sheet and device thereof
EP0364355A2 (en) * 1988-10-11 1990-04-18 Sony Corporation Spindle servo control for electronic still camera
US5218451A (en) * 1988-10-11 1993-06-08 Sony Corporation Spindle servo control for electronic still camera
US6434027B1 (en) 1998-03-11 2002-08-13 Murata Manufacturing Co., Ltd. Switching power supply having a plurality of output voltages and minimal number of terminals

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