JPS56164363A - Illuminating device of variable magnification copying machine - Google Patents
Illuminating device of variable magnification copying machineInfo
- Publication number
- JPS56164363A JPS56164363A JP6857280A JP6857280A JPS56164363A JP S56164363 A JPS56164363 A JP S56164363A JP 6857280 A JP6857280 A JP 6857280A JP 6857280 A JP6857280 A JP 6857280A JP S56164363 A JPS56164363 A JP S56164363A
- Authority
- JP
- Japan
- Prior art keywords
- lamps
- magnification
- end part
- interval
- illuminating device
- 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
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
- G03B27/00—Photographic printing apparatus
- G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
- G03B27/52—Details
- G03B27/54—Lamp housings; Illuminating means
- G03B27/542—Lamp housings; Illuminating means for copying cameras, reflex exposure lighting
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Variable Magnification In Projection-Type Copying Machines (AREA)
- Control Of Exposure In Printing And Copying (AREA)
- Control Or Security For Electrophotography (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
Abstract
PURPOSE:To make correction of illuminance distribution easily in a longitudinal direction of a slit when magnification is varied by providing a plurality of electric lamps at focus point parts of an elliptical tube reflecting mirror located on a straight line in an interval with which a reduction of a light of a peripheral part of an optical lens can be compensated. CONSTITUTION:For example, in the illuminating device which is made to correspond with two steps of magnification, firstly when equal magnification, by an output of an equal magnification mode signal generating source 12, connection are made among terminals a-c of switching circuits 13-1 and 13-2 and voltage of a power source 11 is applied to a series circuit of halogen lamps A1- A6. In this instance, the lamps A1-A6 are symmetrical to an optical axis, further because of narrowness of an interval at an end part of an effective slit length D, luminous intensity at the end part becomes high. Secondly, in case of m times the magnification terminals b-c of the switching circuits 13-1 and 13-2 are connected, and voltage is applied to a series circuit of lamps B1-B<6>. In this case, the lamps B1-B6 are assymmetrical with respect to an optical axis and a lamp interval at one end part of the slit length D is narrow compared with the other end part, so, luminous intensity at the narrow side relatively becomes high. Thus with such constitution, the illuminance distribution can be easily corrected.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6857280A JPS56164363A (en) | 1980-05-23 | 1980-05-23 | Illuminating device of variable magnification copying machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6857280A JPS56164363A (en) | 1980-05-23 | 1980-05-23 | Illuminating device of variable magnification copying machine |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56164363A true JPS56164363A (en) | 1981-12-17 |
Family
ID=13377610
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6857280A Pending JPS56164363A (en) | 1980-05-23 | 1980-05-23 | Illuminating device of variable magnification copying machine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56164363A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62200370A (en) * | 1986-02-28 | 1987-09-04 | Ricoh Co Ltd | Lighting device for copying machine |
US4924260A (en) * | 1987-06-23 | 1990-05-08 | Polaroid Corporation | Exposure system of image forming apparatus |
WO1993013455A1 (en) * | 1987-06-23 | 1993-07-08 | Kenichi Shimizu | Exposure device of image formation apparatus |
WO1993013456A1 (en) * | 1987-06-23 | 1993-07-08 | Kenichi Shimizu | Exposure device of image formation apparatus |
-
1980
- 1980-05-23 JP JP6857280A patent/JPS56164363A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62200370A (en) * | 1986-02-28 | 1987-09-04 | Ricoh Co Ltd | Lighting device for copying machine |
US4924260A (en) * | 1987-06-23 | 1990-05-08 | Polaroid Corporation | Exposure system of image forming apparatus |
WO1993013455A1 (en) * | 1987-06-23 | 1993-07-08 | Kenichi Shimizu | Exposure device of image formation apparatus |
WO1993013456A1 (en) * | 1987-06-23 | 1993-07-08 | Kenichi Shimizu | Exposure device of image formation apparatus |
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