JPS57112729A - Speed governor for camera - Google Patents

Speed governor for camera

Info

Publication number
JPS57112729A
JPS57112729A JP18924180A JP18924180A JPS57112729A JP S57112729 A JPS57112729 A JP S57112729A JP 18924180 A JP18924180 A JP 18924180A JP 18924180 A JP18924180 A JP 18924180A JP S57112729 A JPS57112729 A JP S57112729A
Authority
JP
Japan
Prior art keywords
gear
poles
coil
speed
magnetic
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
JP18924180A
Other languages
Japanese (ja)
Inventor
Hidehiko Fukahori
Noriyoshi Iwashita
Katsunori Nakamura
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 JP18924180A priority Critical patent/JPS57112729A/en
Priority to US06/333,293 priority patent/US4408859A/en
Priority to DE19813151604 priority patent/DE3151604A1/en
Publication of JPS57112729A publication Critical patent/JPS57112729A/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
    • G03B9/00—Exposure-making shutters; Diaphragms
    • G03B9/58—Means for varying duration of "open" period of shutter
    • G03B9/62—Means for varying duration of "open" period of shutter by varying interval of time between end of opening movement and beginning of closing movement

Abstract

PURPOSE:To stabilize the operation speed of a high-speed operating member of the camera, by providing a permanent magnet having plural poles and a yoke with a coil and by connecting resistances to both ends of the coil to damp the driving member. CONSTITUTION:A governing mechanism including a governing gear row which is accelerated and driven synchronously by a driving member which drives a high- speed operating shutter to a prescribed position is connected to this driving member, and plural N and S poles 29 are provided in a gear 28 of a stop wheel 21, which is driven by the last gear 20a of this gear row, as one body. When a driving lever is moved, the stop wheel gear 28 is accelerated and rotated through the gear row, and poles 29 are rotated also to change magnetic poles successively in a magnetic yoke 30, and thus, an AC current is generated in a magnetic coil 31. A resistance R1 is provided on the magnetic coil 31 to consume the AC current as a heat energy, and a damping force corresponding to the rotation speed of the gear 28 is generated to make the speed constant.
JP18924180A 1980-12-29 1980-12-29 Speed governor for camera Pending JPS57112729A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP18924180A JPS57112729A (en) 1980-12-29 1980-12-29 Speed governor for camera
US06/333,293 US4408859A (en) 1980-12-29 1981-12-22 Speed governor for camera
DE19813151604 DE3151604A1 (en) 1980-12-29 1981-12-28 "SPEED CONTROLLER FOR A CAMERA"

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18924180A JPS57112729A (en) 1980-12-29 1980-12-29 Speed governor for camera

Publications (1)

Publication Number Publication Date
JPS57112729A true JPS57112729A (en) 1982-07-13

Family

ID=16237971

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18924180A Pending JPS57112729A (en) 1980-12-29 1980-12-29 Speed governor for camera

Country Status (1)

Country Link
JP (1) JPS57112729A (en)

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