JPS5779923A - Automatic exposure controller of camaera - Google Patents
Automatic exposure controller of camaeraInfo
- Publication number
- JPS5779923A JPS5779923A JP15625980A JP15625980A JPS5779923A JP S5779923 A JPS5779923 A JP S5779923A JP 15625980 A JP15625980 A JP 15625980A JP 15625980 A JP15625980 A JP 15625980A JP S5779923 A JPS5779923 A JP S5779923A
- Authority
- JP
- Japan
- Prior art keywords
- value
- contents
- exposure
- counts
- converted
- 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
- 101001003135 Homo sapiens Interleukin-13 receptor subunit alpha-1 Proteins 0.000 abstract 2
- 101001003132 Homo sapiens Interleukin-13 receptor subunit alpha-2 Proteins 0.000 abstract 2
- 101000633613 Homo sapiens Probable threonine protease PRSS50 Proteins 0.000 abstract 2
- 102100020791 Interleukin-13 receptor subunit alpha-1 Human genes 0.000 abstract 2
- 102100029523 Probable threonine protease PRSS50 Human genes 0.000 abstract 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
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
- G03B7/093—Digital circuits for control of exposure time
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Exposure Control For Cameras (AREA)
Abstract
PURPOSE:To improve the precision of exposure control by weighting logarithmically compressed information on object luminance and by performing expansion by a value converted into an approximate binary number on the basis of its count value. CONSTITUTION:A signal Vs compressed logarithmically corresponding to the luminance of an object is convertd 18 into pulses so that the exposure value of every pulse has 1/n-stage weight, and every time an n-scale counter CT19 counts the converted pulses up to (n), an m-scale CT20 counts up by one. Further, the contents (l) (<n) of the CT19 are converted 21 into an approximate binary expanded value 2l</2>, which is shifted 22 by (k) digits by the counts (k) (<m) of the CT20; and the contents of a register 22 are transferred to a CT24 in response to a shutter release signal and on the start of exposure operation, the contents of the register 22 are decreased. When the contents of the CT24 goes down to a prescribed value, a shutter is closed. At this time, exposure control is exercised by exposure time which approximates to an expanded value 2<(k+>l</n>).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15625980A JPS5779923A (en) | 1980-11-06 | 1980-11-06 | Automatic exposure controller of camaera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15625980A JPS5779923A (en) | 1980-11-06 | 1980-11-06 | Automatic exposure controller of camaera |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5779923A true JPS5779923A (en) | 1982-05-19 |
Family
ID=15623880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15625980A Pending JPS5779923A (en) | 1980-11-06 | 1980-11-06 | Automatic exposure controller of camaera |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5779923A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61149935A (en) * | 1984-12-24 | 1986-07-08 | Copal Co Ltd | Exposure controller |
-
1980
- 1980-11-06 JP JP15625980A patent/JPS5779923A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61149935A (en) * | 1984-12-24 | 1986-07-08 | Copal Co Ltd | Exposure controller |
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