JPS5540480A - Program shutter device - Google Patents
Program shutter deviceInfo
- Publication number
- JPS5540480A JPS5540480A JP11398378A JP11398378A JPS5540480A JP S5540480 A JPS5540480 A JP S5540480A JP 11398378 A JP11398378 A JP 11398378A JP 11398378 A JP11398378 A JP 11398378A JP S5540480 A JPS5540480 A JP S5540480A
- Authority
- JP
- Japan
- Prior art keywords
- value
- exposure
- address
- outputted
- calculating
- 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
- Exposure Control For Cameras (AREA)
Abstract
PURPOSE: To achieve the higher speed of calculation by storing the value of exposure time TV corresponding to the preprogrammed exposure value EV, calculating TV from the digital signal of the exposure value EV obtained from said data and photometry results and calculating AV from EV and TV.
CONSTITUTION: The exposure value EV corresponding to the subject luminance is outputted in digital signals of 8 bits from the circuit 1 and the address of a permanent memory ROM 7 is assigned by the address signal based on the signal of the upper bits thereof. The value of the exposure time TV corresponding to the exposure value EV having programmed beforehand has been stored in that address and the exposure time TV is calculated in an adder 8 from the data thereof and the signal based on the lower bit of the exposure value EV. In a subtractor 9, the aperture value AV is calculated from the EV and TV value and is outputted to a display and exposure control circuit 10.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11398378A JPS5540480A (en) | 1978-09-16 | 1978-09-16 | Program shutter device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11398378A JPS5540480A (en) | 1978-09-16 | 1978-09-16 | Program shutter device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5540480A true JPS5540480A (en) | 1980-03-21 |
Family
ID=14626109
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11398378A Pending JPS5540480A (en) | 1978-09-16 | 1978-09-16 | Program shutter device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5540480A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5427523U (en) * | 1977-07-27 | 1979-02-22 | ||
JPS60254027A (en) * | 1984-05-30 | 1985-12-14 | Seiko Koki Kk | Control circuit of program shutter |
JPS6148819A (en) * | 1984-08-16 | 1986-03-10 | Seiko Koki Kk | Control circuit of program shutter |
FR2633734A1 (en) * | 1988-06-08 | 1990-01-05 | Asahi Optical Co Ltd | |
JPH03109531A (en) * | 1990-08-24 | 1991-05-09 | Seikosha Co Ltd | Program shutter |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS516550A (en) * | 1974-07-05 | 1976-01-20 | Canon Kk | ROSHUTSUSEIGYOHOHO |
JPS5246815A (en) * | 1975-10-09 | 1977-04-14 | Asahi Optical Co Ltd | Camera controller |
-
1978
- 1978-09-16 JP JP11398378A patent/JPS5540480A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS516550A (en) * | 1974-07-05 | 1976-01-20 | Canon Kk | ROSHUTSUSEIGYOHOHO |
JPS5246815A (en) * | 1975-10-09 | 1977-04-14 | Asahi Optical Co Ltd | Camera controller |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5427523U (en) * | 1977-07-27 | 1979-02-22 | ||
JPS569726Y2 (en) * | 1977-07-27 | 1981-03-04 | ||
JPS60254027A (en) * | 1984-05-30 | 1985-12-14 | Seiko Koki Kk | Control circuit of program shutter |
JPS6148819A (en) * | 1984-08-16 | 1986-03-10 | Seiko Koki Kk | Control circuit of program shutter |
FR2633734A1 (en) * | 1988-06-08 | 1990-01-05 | Asahi Optical Co Ltd | |
US5508779A (en) * | 1988-06-08 | 1996-04-16 | Asahi Kogaku Kogyo Kabushiki Kaisha | Auto-bracketing system |
JPH03109531A (en) * | 1990-08-24 | 1991-05-09 | Seikosha Co Ltd | Program shutter |
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