JPS57622A - Photometric device - Google Patents
Photometric deviceInfo
- Publication number
- JPS57622A JPS57622A JP7451280A JP7451280A JPS57622A JP S57622 A JPS57622 A JP S57622A JP 7451280 A JP7451280 A JP 7451280A JP 7451280 A JP7451280 A JP 7451280A JP S57622 A JPS57622 A JP S57622A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- gate
- output signal
- average value
- supplied
- 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
- G03B7/091—Digital circuits
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Exposure Control For Cameras (AREA)
Abstract
PURPOSE:To permit arbitrary setting of a photometric range according to the brightness of a object by outputting only the photocurrent of the prescribed partial region of the object to an arithmetic means according to the preset reference signal. CONSTITUTION:The output signals from a photodetecting range of a photodetecting part 1 divided to nXm matrix are supplied successively to a switch 20 via an A/D converting circuit 18. The switch 20 is connected to a movable contact 20-b, and the output of the circuit 18 is supplied to an average value operating part 2, by which the average value of mXn pieces of photodetection values is calculated. This average value is supplied to an AND gate 42 via the addres 30, 32 and comparators 38, 40 of a decision part 3. The gate 42 supplies the signal of an H level to a gate circuit 46 if the output signal of the part 1 is within the range set by a photographer in reference signal generators 34, 36. The circuit 46 is electrically conducted by the output signal of the gate 42 to supply only the output signal of the part 1 which is decided to be within the photometric range by the part 3 to an exposure operating part 5. The part 5 calculates an exposure value by the output signal of the circuit 46.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7451280A JPS57622A (en) | 1980-06-03 | 1980-06-03 | Photometric device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7451280A JPS57622A (en) | 1980-06-03 | 1980-06-03 | Photometric device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57622A true JPS57622A (en) | 1982-01-05 |
Family
ID=13549449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7451280A Pending JPS57622A (en) | 1980-06-03 | 1980-06-03 | Photometric device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57622A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4745427A (en) * | 1985-09-13 | 1988-05-17 | Minolta Camera Kabushiki Kaisha | Multi-point photometric apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50129221A (en) * | 1974-04-01 | 1975-10-13 |
-
1980
- 1980-06-03 JP JP7451280A patent/JPS57622A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50129221A (en) * | 1974-04-01 | 1975-10-13 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4745427A (en) * | 1985-09-13 | 1988-05-17 | Minolta Camera Kabushiki Kaisha | Multi-point photometric apparatus |
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