JPS57139723A - Automatic exposure controller of ttl direct measurement camera - Google Patents

Automatic exposure controller of ttl direct measurement camera

Info

Publication number
JPS57139723A
JPS57139723A JP56025759A JP2575981A JPS57139723A JP S57139723 A JPS57139723 A JP S57139723A JP 56025759 A JP56025759 A JP 56025759A JP 2575981 A JP2575981 A JP 2575981A JP S57139723 A JPS57139723 A JP S57139723A
Authority
JP
Japan
Prior art keywords
film
lamp
circuit
difference
direct measurement
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
JP56025759A
Other languages
Japanese (ja)
Inventor
Masabumi Yamazaki
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.)
Olympus Corp
Original Assignee
Olympus Corp
Olympus Optical 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 Olympus Corp, Olympus Optical Co Ltd filed Critical Olympus Corp
Priority to JP56025759A priority Critical patent/JPS57139723A/en
Priority to US06/322,853 priority patent/US4408852A/en
Priority to FR8122159A priority patent/FR2495790A1/en
Priority to GB8136580A priority patent/GB2090005B/en
Priority to DE3148071A priority patent/DE3148071C2/en
Publication of JPS57139723A publication Critical patent/JPS57139723A/en
Pending 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
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
    • G03B7/081—Analogue circuits
    • G03B7/083—Analogue circuits for control of exposure time

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Control For Cameras (AREA)

Abstract

PURPOSE:To compensate the error of a film reflectance for TTL direct measurement, by carrying out the idle shooting for measurement of the film relfectance at a time point when the film frame number shows <=1 and storing the reflectance. CONSTITUTION:When a film load end switch 49 is closed, a lamp 51 glows up to make a gate circuit 44 conductive. The reflected light of the lamp 51 and given from the shutter blade surface is measured a measuring element 4, and the measured value is held at a storage capacitor 16. A difference between the measured value obtained the shutter is fully opened and the stored value is obtained through a subtractor circuit 24 to be held at a capacitor 27. This difference value receives an A/D conversion to be stored in a memory circuit 45 via the gate 44. This stored value becomes inherent to the difference of reflectances between the surface of the shutter blade and the film surface. The switch 49 opens when the film is advanced next to make the circuit 44 inconductive. Then the lamp 51 is also turned off.
JP56025759A 1980-12-05 1981-02-23 Automatic exposure controller of ttl direct measurement camera Pending JPS57139723A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP56025759A JPS57139723A (en) 1981-02-23 1981-02-23 Automatic exposure controller of ttl direct measurement camera
US06/322,853 US4408852A (en) 1980-12-05 1981-11-19 Automatic exposure controller for camera of TTL direct photometry type
FR8122159A FR2495790A1 (en) 1980-12-05 1981-11-26 AUTOMATIC EXPOSURE CONTROL DEVICE FOR DIRECT PHOTOMETRY TYPE PHOTOGRAPHIC APPARATUS THROUGH THE OBJECTIVE
GB8136580A GB2090005B (en) 1980-12-05 1981-12-04 Improvements in or relating to automatic exposure controllers for cameras of ttl direct photometry type
DE3148071A DE3148071C2 (en) 1980-12-05 1981-12-04 Automatic exposure device for a camera with light measurement through the lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56025759A JPS57139723A (en) 1981-02-23 1981-02-23 Automatic exposure controller of ttl direct measurement camera

Publications (1)

Publication Number Publication Date
JPS57139723A true JPS57139723A (en) 1982-08-28

Family

ID=12174755

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56025759A Pending JPS57139723A (en) 1980-12-05 1981-02-23 Automatic exposure controller of ttl direct measurement camera

Country Status (1)

Country Link
JP (1) JPS57139723A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4856710B2 (en) * 2005-09-28 2012-01-18 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング Drive unit with bearing device without axial play

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4856710B2 (en) * 2005-09-28 2012-01-18 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング Drive unit with bearing device without axial play
US8365630B2 (en) 2005-09-28 2013-02-05 Robert Bosch Gmbh Transmission drive unit with a zero axial backlash bearing fastening, in particular for adjusting a movable part in a motor vehicle

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