JPS5752033A - Detector for extent of film movement of camera - Google Patents

Detector for extent of film movement of camera

Info

Publication number
JPS5752033A
JPS5752033A JP12765380A JP12765380A JPS5752033A JP S5752033 A JPS5752033 A JP S5752033A JP 12765380 A JP12765380 A JP 12765380A JP 12765380 A JP12765380 A JP 12765380A JP S5752033 A JPS5752033 A JP S5752033A
Authority
JP
Japan
Prior art keywords
perforations
comparing
positions
output signals
light beams
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
JP12765380A
Other languages
Japanese (ja)
Inventor
Seijiro Kushibe
Susumu Fujita
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.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film 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 Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Priority to JP12765380A priority Critical patent/JPS5752033A/en
Publication of JPS5752033A publication Critical patent/JPS5752033A/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
    • G03B1/00—Film strip handling
    • G03B1/60—Measuring or indicating length of the used or unused film; Counting number of exposures

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Details Of Cameras Including Film Mechanisms (AREA)

Abstract

PURPOSE:To check perforations securely by providing a couple of photodetectors which photodetect reflected light beams or transmitted light beams from two positions having a half pitch of perforations, and then by comparing their output signals with each other. CONSTITUTION:A film 1, when wound, runs as shown as an arrow and reflected beams RA and RB of infrared rays IA and IB projected upon two positions A and B by a projector 3 vary every time a perforation 2 passes. They are inputted as output signals PA and PB having peaks shifted in position by a half pitch, to the plus terminals 6a and minus terminal 6b of a comparator 6, which compares their levels with each other directly. As a result, a count signal is obtained by comparing the maximum and minimum values of two photodetection signals at any time, and consequently perforations are detected securely.
JP12765380A 1980-09-13 1980-09-13 Detector for extent of film movement of camera Pending JPS5752033A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12765380A JPS5752033A (en) 1980-09-13 1980-09-13 Detector for extent of film movement of camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12765380A JPS5752033A (en) 1980-09-13 1980-09-13 Detector for extent of film movement of camera

Publications (1)

Publication Number Publication Date
JPS5752033A true JPS5752033A (en) 1982-03-27

Family

ID=14965406

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12765380A Pending JPS5752033A (en) 1980-09-13 1980-09-13 Detector for extent of film movement of camera

Country Status (1)

Country Link
JP (1) JPS5752033A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61133930A (en) * 1984-12-04 1986-06-21 Nippon Kogaku Kk <Nikon> Film feeding device of camera
JPH0277056A (en) * 1988-09-13 1990-03-16 Konica Corp Film feeding controller for camera

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61133930A (en) * 1984-12-04 1986-06-21 Nippon Kogaku Kk <Nikon> Film feeding device of camera
JPH0277056A (en) * 1988-09-13 1990-03-16 Konica Corp Film feeding controller for camera

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