JPS57109936A - Detector of film frame number - Google Patents

Detector of film frame number

Info

Publication number
JPS57109936A
JPS57109936A JP18594980A JP18594980A JPS57109936A JP S57109936 A JPS57109936 A JP S57109936A JP 18594980 A JP18594980 A JP 18594980A JP 18594980 A JP18594980 A JP 18594980A JP S57109936 A JPS57109936 A JP S57109936A
Authority
JP
Japan
Prior art keywords
pulse
film
light
exposure
detection
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
JP18594980A
Other languages
Japanese (ja)
Inventor
Masahiro Kitagawa
Akihiko Hashimoto
Hitoshi Shirai
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 JP18594980A priority Critical patent/JPS57109936A/en
Publication of JPS57109936A publication Critical patent/JPS57109936A/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
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/36—Counting number of exposures

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Indication In Cameras, And Counting Of Exposures (AREA)

Abstract

PURPOSE:To prevent the exposure of a film to the light for detection, by detecting the output signal of a photodetector synchronously with the light emission of a light emittig element which is connected to the photodetector and a drive means. CONSTITUTION:A release switch 10 is once closed when the film exposure is over. With the closure of the switch 10, a motor is turned counterclockwise to advance a film 234 via a gear 220, etc. The pulse signals of frequencies fK, fl-1, fl, fl+1, fl+2, fm and fm are delivered through output terminals 38, 40, 42, 44, 46, 48 and 50 of a counter circuit 30 respectively. The output signal of an AND gate 76 is identical with a pulse signal with which the pulse of L level hav ing a duration Tb=1/2fl is repeated in a cycle of Ta=1/fl+2. In this case, Ta:Tb= 8:1 is satisfied. As a result, a transistor 88 conducts according to the pulse of L level, and a light emitting diode 92 has a pulse emission. In such a way, the exposure of the film can be avoided to the light for detection.
JP18594980A 1980-12-26 1980-12-26 Detector of film frame number Pending JPS57109936A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18594980A JPS57109936A (en) 1980-12-26 1980-12-26 Detector of film frame number

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18594980A JPS57109936A (en) 1980-12-26 1980-12-26 Detector of film frame number

Publications (1)

Publication Number Publication Date
JPS57109936A true JPS57109936A (en) 1982-07-08

Family

ID=16179690

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18594980A Pending JPS57109936A (en) 1980-12-26 1980-12-26 Detector of film frame number

Country Status (1)

Country Link
JP (1) JPS57109936A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60118130U (en) * 1984-01-16 1985-08-09 オリンパス光学工業株式会社 Film transfer detection device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60118130U (en) * 1984-01-16 1985-08-09 オリンパス光学工業株式会社 Film transfer detection device

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