JPS5448531A - Preventing device for malfunction in camera with autowatic focus control device - Google Patents
Preventing device for malfunction in camera with autowatic focus control deviceInfo
- Publication number
- JPS5448531A JPS5448531A JP10643577A JP10643577A JPS5448531A JP S5448531 A JPS5448531 A JP S5448531A JP 10643577 A JP10643577 A JP 10643577A JP 10643577 A JP10643577 A JP 10643577A JP S5448531 A JPS5448531 A JP S5448531A
- Authority
- JP
- Japan
- Prior art keywords
- operating switch
- malfunction
- maximum value
- plunged
- input terminal
- 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.)
- Granted
Links
Landscapes
- Focusing (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
PURPOSE: To prevent the malfunction due to the switching action of an operating switch by connecting one input terminal of a maximum value detector with the net of the operating switch at least via delay capacitor.
CONSTITUTION: In case the main subject does not make a clear and distinct contrast to its field, for example, in case the landscape, etc. in the infinite distance is photographed, a trouble, such as, that scanning control plate 14 is made to stop in the finite distance by the electric current fluctuation phenomenon, etc. in the circuit produced when operating switch SW is plunged happens. The above electric current fluctuation phenomenon, etc. produced when the operating switch SW is plunged is utilized for the purpose of lowering photoelectric signal VCO by connecting one input terminal of maximum value detector 8 with the network of the operating switch SW via at least delay capacitor C3, and concurrently, digital signal VAF from A-D converter 9 is applied to maximum value detecton circuit, thus the malfunction can be prevented by setting the subsequent comparation signal VDT to be a much hihger value
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10643577A JPS5917402B2 (en) | 1977-09-05 | 1977-09-05 | Malfunction prevention device for cameras equipped with automatic focus adjustment device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10643577A JPS5917402B2 (en) | 1977-09-05 | 1977-09-05 | Malfunction prevention device for cameras equipped with automatic focus adjustment device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5448531A true JPS5448531A (en) | 1979-04-17 |
JPS5917402B2 JPS5917402B2 (en) | 1984-04-21 |
Family
ID=14433560
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10643577A Expired JPS5917402B2 (en) | 1977-09-05 | 1977-09-05 | Malfunction prevention device for cameras equipped with automatic focus adjustment device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5917402B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0538323Y2 (en) * | 1990-02-07 | 1993-09-28 |
-
1977
- 1977-09-05 JP JP10643577A patent/JPS5917402B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5917402B2 (en) | 1984-04-21 |
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