JPS5662220A - Unstable operation preventing system of automatic focus detector - Google Patents
Unstable operation preventing system of automatic focus detectorInfo
- Publication number
- JPS5662220A JPS5662220A JP13954979A JP13954979A JPS5662220A JP S5662220 A JPS5662220 A JP S5662220A JP 13954979 A JP13954979 A JP 13954979A JP 13954979 A JP13954979 A JP 13954979A JP S5662220 A JPS5662220 A JP S5662220A
- Authority
- JP
- Japan
- Prior art keywords
- taking lens
- capacitors
- transistors
- focus
- driving
- 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 eliminate the unstability of a device owing to transient fluctuations by providing a delay circuit consisting of capacitors and transistors for electric discharging to the input of the driving circuit of a taking lens, disabling the lens driving circuit for a fixed time and instantaneously discharging the charge of the capacitors.
CONSTITUTION: In the taking lens driving control circuit, transistors TR1WTR4 control the forward and backward revolutions of a taking lens drive motor MT. TR5 and TR6 are transistors for controlling the TR1 and TR2, and the driving of the TR5, TR6 is delayed by way of capacitors C1, C2. On the other hand, the charge of the C1, C2 is instantaneously discharged by way of TR7, TR8, whereby the turning-off of the TR5, TR6 is made early to prevent the taking lens from fluctuating. The motor MT is revolved in a forward or backward direction by the combinations of the H level and L level of the focus detecting information MV1W MV4 from a focus control circuit, whereby the focusing is controlled. Thereby, the unstability owing the transient fluctuations of the focus detector is removed and the device is stably operated.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13954979A JPS5662220A (en) | 1979-10-26 | 1979-10-26 | Unstable operation preventing system of automatic focus detector |
US06/199,262 US4335942A (en) | 1979-10-26 | 1980-10-21 | Camera provided with automatic focus detector |
DE3040162A DE3040162C2 (en) | 1979-10-26 | 1980-10-24 | Automatic focusing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13954979A JPS5662220A (en) | 1979-10-26 | 1979-10-26 | Unstable operation preventing system of automatic focus detector |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5662220A true JPS5662220A (en) | 1981-05-28 |
JPS6227688B2 JPS6227688B2 (en) | 1987-06-16 |
Family
ID=15247841
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13954979A Granted JPS5662220A (en) | 1979-10-26 | 1979-10-26 | Unstable operation preventing system of automatic focus detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5662220A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57130324U (en) * | 1981-02-03 | 1982-08-13 | ||
JPS5852607A (en) * | 1981-09-24 | 1983-03-28 | Nippon Kogaku Kk <Nikon> | Automatic focusing device |
JPS593406A (en) * | 1982-06-29 | 1984-01-10 | Olympus Optical Co Ltd | Detector for focusing state |
JPS6231814A (en) * | 1985-08-02 | 1987-02-10 | Matsushita Electric Ind Co Ltd | Automatic focus adjusting device |
JPH03155530A (en) * | 1990-10-09 | 1991-07-03 | Asahi Optical Co Ltd | Lens shutter type zoom lens camera |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01223986A (en) * | 1988-03-02 | 1989-09-07 | Sankyo Kk | Rotary drum device of slot machine |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52126225A (en) * | 1976-04-15 | 1977-10-22 | Asahi Optical Co Ltd | Automatic focusing unit control circuit for ignoring pseudoofocus position detection signal |
-
1979
- 1979-10-26 JP JP13954979A patent/JPS5662220A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52126225A (en) * | 1976-04-15 | 1977-10-22 | Asahi Optical Co Ltd | Automatic focusing unit control circuit for ignoring pseudoofocus position detection signal |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57130324U (en) * | 1981-02-03 | 1982-08-13 | ||
JPH0228508Y2 (en) * | 1981-02-03 | 1990-07-31 | ||
JPS5852607A (en) * | 1981-09-24 | 1983-03-28 | Nippon Kogaku Kk <Nikon> | Automatic focusing device |
JPH0235962B2 (en) * | 1981-09-24 | 1990-08-14 | Nippon Kogaku Kk | |
JPS593406A (en) * | 1982-06-29 | 1984-01-10 | Olympus Optical Co Ltd | Detector for focusing state |
JPH0254523B2 (en) * | 1982-06-29 | 1990-11-21 | Olympus Optical Co | |
JPS6231814A (en) * | 1985-08-02 | 1987-02-10 | Matsushita Electric Ind Co Ltd | Automatic focus adjusting device |
JPH03155530A (en) * | 1990-10-09 | 1991-07-03 | Asahi Optical Co Ltd | Lens shutter type zoom lens camera |
Also Published As
Publication number | Publication date |
---|---|
JPS6227688B2 (en) | 1987-06-16 |
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