JPS54139726A - Preventing method and apparatus for malfunction of auto focus system - Google Patents
Preventing method and apparatus for malfunction of auto focus systemInfo
- Publication number
- JPS54139726A JPS54139726A JP4719478A JP4719478A JPS54139726A JP S54139726 A JPS54139726 A JP S54139726A JP 4719478 A JP4719478 A JP 4719478A JP 4719478 A JP4719478 A JP 4719478A JP S54139726 A JPS54139726 A JP S54139726A
- Authority
- JP
- Japan
- Prior art keywords
- scanning
- value
- signal
- photo detecting
- malfunction
- 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
- Automatic Focus Adjustment (AREA)
- Focusing (AREA)
Abstract
PURPOSE: To enable smooth and accurate focusing to be performed by preventing a distance control lens from making hunting form movement owing to once or more appearance of the extremal value and malfunction of module, etc.
CONSTITUTION: This measures distances by receiving the field light from a scanning mirror 1 in a photo detecting part, receiving the field light from a stationary mirror in a photo detecting part 4 and measuring the correlations in the respective photo detecting parts wherein the maximum extremal value of the correlation signals is stored and held in a holding circuit 9 at the scanning in one direction of the scanning mirror 1, the level signal which has been set at a value lower by the specified level determined from the maximum extremal value having been thus stored and held, by taking S/N, etc. into consideration, at the scanning in the opposite direction, and the correlation signal at the scanning in the opposite direction are compared in a comparator 11, and arrangement is so made that a distance signal is transmitted only when the times of taking the value higher than the level signal toward the correlation signal are once and no distance is transmitted when they are zero or twice or more.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4719478A JPS54139726A (en) | 1978-04-22 | 1978-04-22 | Preventing method and apparatus for malfunction of auto focus system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4719478A JPS54139726A (en) | 1978-04-22 | 1978-04-22 | Preventing method and apparatus for malfunction of auto focus system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54139726A true JPS54139726A (en) | 1979-10-30 |
Family
ID=12768299
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4719478A Pending JPS54139726A (en) | 1978-04-22 | 1978-04-22 | Preventing method and apparatus for malfunction of auto focus system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54139726A (en) |
-
1978
- 1978-04-22 JP JP4719478A patent/JPS54139726A/en active Pending
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS56132315A (en) | Automatic focusing method | |
JPS5451556A (en) | Distance measuring apparatus | |
JPS54126023A (en) | Optical device | |
JPS5770503A (en) | Automatic focusing device | |
JPS5385452A (en) | Range finder | |
JPS57161839A (en) | Distance measuring device of camera | |
JPS5295221A (en) | Detector for focusing | |
JPS5598709A (en) | Focusing detector | |
JPS5428133A (en) | Optical path extension device with focus detection function | |
JPS55111929A (en) | Automatic focusing device | |
GB1521100A (en) | Distance detecting apparatus | |
JPS5697325A (en) | Focus detecting method of camera | |
JPS5299820A (en) | Focusing glass | |
JPS52147430A (en) | Focus detection device | |
JPS5540447A (en) | Image correcting method in zoom lens | |
JPS5764713A (en) | Automatic focus controller | |
JPS5282264A (en) | Range finder | |
JPS54139726A (en) | Preventing method and apparatus for malfunction of auto focus system | |
JPS52113750A (en) | Scanning optical system having beam detecting optics for information | |
JPS5461522A (en) | Automatic focusing device | |
JPS53105223A (en) | Optical system of distance detector for automatic focusing | |
JPS5319805A (en) | Automatic focusing optical device | |
JPS55106421A (en) | Focusing detector | |
JPS5332730A (en) | Camera with photo-electric focalization detector | |
JPS5317728A (en) | Focus detector for cine camera |