JPS5476229A - Photometry circuit - Google Patents
Photometry circuitInfo
- Publication number
- JPS5476229A JPS5476229A JP14357177A JP14357177A JPS5476229A JP S5476229 A JPS5476229 A JP S5476229A JP 14357177 A JP14357177 A JP 14357177A JP 14357177 A JP14357177 A JP 14357177A JP S5476229 A JPS5476229 A JP S5476229A
- Authority
- JP
- Japan
- Prior art keywords
- output
- brightness
- immediately
- becomes
- amplifier
- 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
Landscapes
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Exposure Control For Cameras (AREA)
Abstract
PURPOSE: To immediately stabilize the output of photometry circuit by providing a switch means which forms a charging path relative to the junction capacity of logarithmic conversion element of the photometry circuit, regulating the charging path based on the value of the photo-electric current, and immediately causing the charged amount to correspond to the brightness of an object to be photographed.
CONSTITUTION: In making electric power switchs SW1, SW2 ON, C1 and C2 are charged to make amplifier A, inoperative, but C1 and C2 immediately discharge due to switch S2 which maintins ON for the predetermined period of time after having been energized so that the amplifier A1 retruns to its operative state. However, C0 is short- circuited at S2, hence the output V0 of the amplifier A1 is lower than the output V1 corresponding to the brightness. After this state, S2 becomes OFF. Meanwhile, the photoelectric current which flows through the ploto-electric conversion element P1 becomes the electric current which corresponds to the brightness of the object L1, and the output of R1 becomes V1. Control circuit CC delivers its output during V0<V1 to make S3 ON. Hence the accumulated electric charge of C0 charged via S3 immediately becomes the charge level corresponding to the brightness, the output V0 of A1 increases to coincides with V1, and the output of photometry circuit is immediately stabilized to the output corresponding to the brightness after having energized thereto.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14357177A JPS5476229A (en) | 1977-11-30 | 1977-11-30 | Photometry circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14357177A JPS5476229A (en) | 1977-11-30 | 1977-11-30 | Photometry circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5476229A true JPS5476229A (en) | 1979-06-18 |
Family
ID=15341837
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14357177A Pending JPS5476229A (en) | 1977-11-30 | 1977-11-30 | Photometry circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5476229A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0022524A1 (en) * | 1979-07-16 | 1981-01-21 | Miles Laboratories, Inc. | Sensor-integrator system |
-
1977
- 1977-11-30 JP JP14357177A patent/JPS5476229A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0022524A1 (en) * | 1979-07-16 | 1981-01-21 | Miles Laboratories, Inc. | Sensor-integrator system |
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