JPS57132170A - Method and device for control of lens position - Google Patents

Method and device for control of lens position

Info

Publication number
JPS57132170A
JPS57132170A JP1788581A JP1788581A JPS57132170A JP S57132170 A JPS57132170 A JP S57132170A JP 1788581 A JP1788581 A JP 1788581A JP 1788581 A JP1788581 A JP 1788581A JP S57132170 A JPS57132170 A JP S57132170A
Authority
JP
Japan
Prior art keywords
lens
position control
accurate
immobile
supporter
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
JP1788581A
Other languages
Japanese (ja)
Inventor
Masayoshi Furuichi
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 Finetech Nisca Inc
Original Assignee
Copyer 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 Copyer Co Ltd filed Critical Copyer Co Ltd
Priority to JP1788581A priority Critical patent/JPS57132170A/en
Publication of JPS57132170A publication Critical patent/JPS57132170A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
    • G03G15/041—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with variable magnification

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Variable Magnification In Projection-Type Copying Machines (AREA)

Abstract

PURPOSE:To realize the accurate setting of a lens position without affected by the dust, etc., by combining a detecting element incapable of a precise position control with a device capable of a precise position control between a carrier of a part to be controlled that holds a lens and shifts and an immobile supporter. CONSTITUTION:A stand board 3 which holds a lens 1 along a guide rod 5 is reciprocally moved. A sliding member is attached slidably to Hall devices 33, 34 and 35 fixed on an immobile supporter and the board 3 via a slit 22. Then the lens 1 is stopped at a position corresponding to the variation of the contraction factor by means of a microswitch 27 provided on the above-mentioned sliding member. In this case, an accurate position control is difficult for some of the Hall devices themselves. And a Hall device which is perfectly sealed up has high resistance to the dust and is not easily affected by the scattering of toner, etc. On the other hand, the accurate position setting is carried out by means of the switch 27 and its related members.
JP1788581A 1981-02-09 1981-02-09 Method and device for control of lens position Pending JPS57132170A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1788581A JPS57132170A (en) 1981-02-09 1981-02-09 Method and device for control of lens position

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1788581A JPS57132170A (en) 1981-02-09 1981-02-09 Method and device for control of lens position

Publications (1)

Publication Number Publication Date
JPS57132170A true JPS57132170A (en) 1982-08-16

Family

ID=11956153

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1788581A Pending JPS57132170A (en) 1981-02-09 1981-02-09 Method and device for control of lens position

Country Status (1)

Country Link
JP (1) JPS57132170A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60156053A (en) * 1984-01-25 1985-08-16 Mita Ind Co Ltd Lens position setting mechanism of variable power optical system
JP6096393B2 (en) * 2014-09-29 2017-03-15 富士フイルム株式会社 Lens device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60156053A (en) * 1984-01-25 1985-08-16 Mita Ind Co Ltd Lens position setting mechanism of variable power optical system
JP6096393B2 (en) * 2014-09-29 2017-03-15 富士フイルム株式会社 Lens device
US10151919B2 (en) 2014-09-29 2018-12-11 Fujifilm Corporation Lens device
US10802271B2 (en) 2014-09-29 2020-10-13 Fujifilm Corporation Lens device

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