JPS57104824A - Reflectophotometer - Google Patents
ReflectophotometerInfo
- Publication number
- JPS57104824A JPS57104824A JP55181522A JP18152280A JPS57104824A JP S57104824 A JPS57104824 A JP S57104824A JP 55181522 A JP55181522 A JP 55181522A JP 18152280 A JP18152280 A JP 18152280A JP S57104824 A JPS57104824 A JP S57104824A
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- center
- shutter screen
- screen
- compensate
- 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
- G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
- G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
PURPOSE:To compensate for changes in measuring condition owing to a difference between the shutter screen and a film using a simple time constant circuit. CONSTITUTION:A capacitor 38 starts charging timed for initial running of a shutter screen. Being center-oriented measurement, a photo diode 10 measures a reflected light from the shutter screen untill the screen reaches the center of the picture. Consequently, the terminal voltage of the capacitor 38 rises at a fixed rate. As the shutter screen runs to the center of the picture, the reflected light from a film enters the photo diode 10 causing a sharp increase in the light current. But, at the same time, a capacitor 26 starts charging to compensate for the sharp increase in the light current. This can maintain the voltage between the base and the emitter of a transistor 32 thereby preventing changes in the measuring condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55181522A JPS57104824A (en) | 1980-12-22 | 1980-12-22 | Reflectophotometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55181522A JPS57104824A (en) | 1980-12-22 | 1980-12-22 | Reflectophotometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57104824A true JPS57104824A (en) | 1982-06-30 |
Family
ID=16102226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55181522A Pending JPS57104824A (en) | 1980-12-22 | 1980-12-22 | Reflectophotometer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57104824A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5127382A (en) * | 1974-07-02 | 1976-03-06 | Olympus Optical Co |
-
1980
- 1980-12-22 JP JP55181522A patent/JPS57104824A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5127382A (en) * | 1974-07-02 | 1976-03-06 | Olympus Optical Co |
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