JPS5589825A - Timer device for camera power source - Google Patents

Timer device for camera power source

Info

Publication number
JPS5589825A
JPS5589825A JP16117678A JP16117678A JPS5589825A JP S5589825 A JPS5589825 A JP S5589825A JP 16117678 A JP16117678 A JP 16117678A JP 16117678 A JP16117678 A JP 16117678A JP S5589825 A JPS5589825 A JP S5589825A
Authority
JP
Japan
Prior art keywords
power source
transistor
timer
timer counter
conducts
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
JP16117678A
Other languages
Japanese (ja)
Other versions
JPS6156901B2 (en
Inventor
Hiroshi Hasegawa
Osamu Yoneda
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.)
Nikon Corp
Nippon Chemical Industrial Co Ltd
Original Assignee
Nippon Chemical Industrial Co Ltd
Nippon Kogaku KK
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 Nippon Chemical Industrial Co Ltd, Nippon Kogaku KK filed Critical Nippon Chemical Industrial Co Ltd
Priority to JP16117678A priority Critical patent/JPS5589825A/en
Publication of JPS5589825A publication Critical patent/JPS5589825A/en
Publication of JPS6156901B2 publication Critical patent/JPS6156901B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Electronic Switches (AREA)
  • Exposure Control For Cameras (AREA)

Abstract

PURPOSE: To surely cut off power source sccording to timer counters for power source by stabilizing the operations of switching transistors by way of a capacitor.
CONSTITUTION: When a switch S closes in cooperation with shutter button, the transistor Tr5 conducts and electric power is supplied to the load of exposure calculation from a primary line 10 via secondary line 20. When the switch S is opened, the transistor Tr1 conducts and the resetting of the flip-flops FF1... of the timer counter for power source is released, whereby timer counting is accomplished. Upon completion of this counting, the output of the timer counter inverts, then the transistor Tr2 goes OFF, the transistor Tr3 goes ON and the transistors Tr4, Tr5 go OFF, thereby cutting off the power source of the secondary line 20. Here, together with the OFF of the transistor Tr5 the increase in the ON resistance of the transistor Tr3 with a decrease in the output voltage is prevented by the charging charge of a capacitor C, thus the power source is surely cut off after the lapse of the specified time corresponding to the timer counter without any malfunction owing to unstable transient phenomena.
COPYRIGHT: (C)1980,JPO&Japio
JP16117678A 1978-12-28 1978-12-28 Timer device for camera power source Granted JPS5589825A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16117678A JPS5589825A (en) 1978-12-28 1978-12-28 Timer device for camera power source

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16117678A JPS5589825A (en) 1978-12-28 1978-12-28 Timer device for camera power source

Publications (2)

Publication Number Publication Date
JPS5589825A true JPS5589825A (en) 1980-07-07
JPS6156901B2 JPS6156901B2 (en) 1986-12-04

Family

ID=15730020

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16117678A Granted JPS5589825A (en) 1978-12-28 1978-12-28 Timer device for camera power source

Country Status (1)

Country Link
JP (1) JPS5589825A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6173419A (en) * 1984-09-19 1986-04-15 Nippon Kogaku Kk <Nikon> Power supply device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63169004U (en) * 1987-04-22 1988-11-02
JPH0159502U (en) * 1987-10-06 1989-04-14
JPH03114103U (en) * 1990-03-07 1991-11-22

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6173419A (en) * 1984-09-19 1986-04-15 Nippon Kogaku Kk <Nikon> Power supply device

Also Published As

Publication number Publication date
JPS6156901B2 (en) 1986-12-04

Similar Documents

Publication Publication Date Title
JPS5536877A (en) Malfunction preventive circuit for cine camera
JPS5589825A (en) Timer device for camera power source
JPS55144222A (en) Camera control circuit
JPS5330760A (en) Switch device for condenser
JPS5543361A (en) Instantaneous service interruption holding circuit for combustion device
JPS5323230A (en) Power closing control system
JPS5553357A (en) Copying machine
JPS57192936A (en) Photographing inhibiting device for camera
JPS57112724A (en) Camera settable to utility mode
JPS54113051A (en) Integrating circuit of time-limit relay
JPS5221585A (en) Signal holding circuit
JPS5779925A (en) Release locking device of camera
JPS55581A (en) Power supply holding device of camera
JPS5511239A (en) Aperture control unit in flash photography
JPS57142626A (en) Preventing device for wasteful consumption of electric power source in flash camera
JPS54105539A (en) Flash device
JPS5355952A (en) Off-delay timer
JPS55582A (en) Power supply holding device of camera
JPS5484225A (en) Switching power source circuit
JPS57135390A (en) Time switch
JPS51136423A (en) An automatic electricity saving device for a stroboscope device
JPS5790190A (en) Multiaction type electronic digital timer
JPS57167014A (en) Electric shutter device for camera
JPS55129323A (en) Electric shutter for camera
JPS55140919A (en) Reset circuit