JPS5577727A - Aperture control mechanism of camera - Google Patents

Aperture control mechanism of camera

Info

Publication number
JPS5577727A
JPS5577727A JP15837879A JP15837879A JPS5577727A JP S5577727 A JPS5577727 A JP S5577727A JP 15837879 A JP15837879 A JP 15837879A JP 15837879 A JP15837879 A JP 15837879A JP S5577727 A JPS5577727 A JP S5577727A
Authority
JP
Japan
Prior art keywords
aperture
variable resistor
time
resistance value
ratchet wheel
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
JP15837879A
Other languages
Japanese (ja)
Inventor
Tatsuya Taguchi
Takashi Uchiyama
Soichi Nakamoto
Tadashi Ito
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 JP15837879A priority Critical patent/JPS5577727A/en
Publication of JPS5577727A publication Critical patent/JPS5577727A/en
Pending legal-status Critical Current

Links

Landscapes

  • Exposure Control For Cameras (AREA)
  • Diaphragms For Cameras (AREA)

Abstract

PURPOSE: To perform accurate exposure control by cooperating an aperture adjusting device to an aperture preset mechanism and providing an aperture information signal generating member.
CONSTITUTION: An arm 32 provided with a brush 136 sliding on a variable resistor 37 for operating exposure second time at one end is fitted to a sector gear 15 by way of an axis 10 and a signal lever 36 engaging with the pin 38' of an aperture preset ring 38 of an interchangeable lens at one end is provided by way of an axis 33. A pinion 15a integral with a ratchet wheel 15b is intermeshed with a gear 18 and a detent pawl 15d which is controlled by a magent 15e provided in opposition to the ratchet wheel 15b. Then, at the time when the resistance value of the variable resistor 37 changes with the revolution of the sector gear 15, a signal is outputted from an exposure operating circuit I at the balance period of a bridge circuit, by which the suction of the magnet 15e is released and the ratchet wheel 15b is stopped, thus the resistance value of the variable resistor 37 becomes a correct aperture resistance value. At the same time, a memory switch S3 goes OFF and the brightness of the subject and the film sensitivity are stored in a capacitor C, whereby the set second time of the variable resistor 52' is corrected.
COPYRIGHT: (C)1980,JPO&Japio
JP15837879A 1979-12-05 1979-12-05 Aperture control mechanism of camera Pending JPS5577727A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15837879A JPS5577727A (en) 1979-12-05 1979-12-05 Aperture control mechanism of camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15837879A JPS5577727A (en) 1979-12-05 1979-12-05 Aperture control mechanism of camera

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP47123633A Division JPS4982336A (en) 1972-12-09 1972-12-09

Publications (1)

Publication Number Publication Date
JPS5577727A true JPS5577727A (en) 1980-06-11

Family

ID=15670387

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15837879A Pending JPS5577727A (en) 1979-12-05 1979-12-05 Aperture control mechanism of camera

Country Status (1)

Country Link
JP (1) JPS5577727A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59231522A (en) * 1983-06-14 1984-12-26 Minolta Camera Co Ltd Camera equipped with preview device
JPS6063526A (en) * 1983-09-19 1985-04-11 Nippon Kogaku Kk <Nikon> Diaphragm control device of camera

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2133212A1 (en) * 1970-07-03 1972-01-05 Nippon Kogaku Kk Camera with automatic control device for exposure

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2133212A1 (en) * 1970-07-03 1972-01-05 Nippon Kogaku Kk Camera with automatic control device for exposure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59231522A (en) * 1983-06-14 1984-12-26 Minolta Camera Co Ltd Camera equipped with preview device
JPS6063526A (en) * 1983-09-19 1985-04-11 Nippon Kogaku Kk <Nikon> Diaphragm control device of camera

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