JPH02909A - Lens back variation correction device for camera - Google Patents
Lens back variation correction device for cameraInfo
- 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
Links
- 230000000875 corresponding Effects 0.000 abstract 1
- 238000001514 detection method Methods 0.000 abstract 1
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
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)
| 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 |
-
1989
- 1989-03-10 JP JP5921089A patent/JPH02909A/en active Pending
Cited By (2)
| 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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