JPH02909A - Lens back variation correction device for camera - Google Patents

Lens back variation correction device for camera

Info

Publication number
JPH02909A
JPH02909A JP5921089A JP5921089A JPH02909A JP H02909 A JPH02909 A JP H02909A JP 5921089 A JP5921089 A JP 5921089A JP 5921089 A JP5921089 A JP 5921089A JP H02909 A JPH02909 A JP H02909A
Authority
JP
Japan
Prior art keywords
lens
case
temperature
variation
range
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
JP5921089A
Other languages
Japanese (ja)
Inventor
Yoshinobu Kudo
Yoshiaki Hata
Motohiro Nakanishi
Original Assignee
Minolta Camera 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 Minolta Camera Co Ltd filed Critical Minolta Camera Co Ltd
Priority to JP5921089A priority Critical patent/JPH02909A/en
Publication of JPH02909A publication Critical patent/JPH02909A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To compensate an accurate lens stop point corresponding to the variation of temperature even if said variation occurs in or over the range of ordinary temperature by adding the lens stop point which is not used at ordinary temperature besides the ∞ position or the closest photographing position of a lens.
CONSTITUTION: A distance detector 2 outputs a distance to an object to a lens feeding control circuit 3 by dividing it, for example, into 1-14 zones. The lens feeding control circuit 3 shifts the zone signal of the distance detector 2 with outputs from a temperature detection circuit 1, so that the zone signals are respectively shifted by -2 in the case of ≤-30°C, by -1 in the case of -30°C to -10°C, by 0 in the case of -10°C to 10°C, by 1 in the case of 10°C to 30°C and by +2 in the case of ≥30°C to control a lens feeding device 4 according to the zone fitted for the respective signals. The amount matched to the component of the variation quantity of the lens back of a photographic lens in the range of temperature where the lens is actually used is provided for feeding the lens. Thus, an accurate focal point can be kept in all the range of usage.
COPYRIGHT: (C)1990,JPO&Japio
JP5921089A 1989-03-10 1989-03-10 Lens back variation correction device for camera Pending JPH02909A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5921089A JPH02909A (en) 1989-03-10 1989-03-10 Lens back variation correction device for camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5921089A JPH02909A (en) 1989-03-10 1989-03-10 Lens back variation correction device for camera

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP63119758A Division JPH01288806A (en) 1988-05-16 1988-05-16 Device for correcting lens back fluctuation in camera

Publications (1)

Publication Number Publication Date
JPH02909A true JPH02909A (en) 1990-01-05

Family

ID=13106812

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5921089A Pending JPH02909A (en) 1989-03-10 1989-03-10 Lens back variation correction device for camera

Country Status (1)

Country Link
JP (1) JPH02909A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001100096A (en) * 1999-07-26 2001-04-13 Fuji Photo Optical Co Ltd Four image read lenses and image reader using same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001100096A (en) * 1999-07-26 2001-04-13 Fuji Photo Optical Co Ltd Four image read lenses and image reader using same
JP4571279B2 (en) * 1999-07-26 2010-10-27 富士フイルム株式会社 Four-image reading lens and image reading apparatus using the same

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