JPS56147133A - Return circuit for lens driving motor - Google Patents
Return circuit for lens driving motorInfo
- Publication number
- JPS56147133A JPS56147133A JP5185180A JP5185180A JPS56147133A JP S56147133 A JPS56147133 A JP S56147133A JP 5185180 A JP5185180 A JP 5185180A JP 5185180 A JP5185180 A JP 5185180A JP S56147133 A JPS56147133 A JP S56147133A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- output
- motor
- counter
- muting
- 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
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
Abstract
PURPOSE:To adjust the focus of the video camera automatically and continuously, by returning always the lens to a prescribed position and resetting the position counter in the initial state of the automatic focus adjustment. CONSTITUTION:Outputs or related outputs of distance counter 7, which counts the feedback time from reflection on the object to receiving of the ultrasonic wave which is output at a prescribed period, and position counter 13, which counts reversibly the rotation of lens moving motor M, are compared with each other by comparing circuit 20, and motor M is rotated in accordance with the comparison output. In this case, the muting output is generated for a fixed time by closing of power supply switch SW, and the muting output is applied to motor M by temporary energizing of relay R, and the lens is returned to the reference position, and position counter 13 is reset in accordance with extinction of the muting output, and after that, the lens is moved to the focus position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5185180A JPS56147133A (en) | 1980-04-18 | 1980-04-18 | Return circuit for lens driving motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5185180A JPS56147133A (en) | 1980-04-18 | 1980-04-18 | Return circuit for lens driving motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS56147133A true JPS56147133A (en) | 1981-11-14 |
Family
ID=12898352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5185180A Pending JPS56147133A (en) | 1980-04-18 | 1980-04-18 | Return circuit for lens driving motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56147133A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01176810U (en) * | 1988-05-31 | 1989-12-18 | ||
| JPH032707A (en) * | 1989-05-30 | 1991-01-09 | Canon Inc | Lens position controller for zoom lens |
| JPH0698240A (en) * | 1992-12-17 | 1994-04-08 | Hitachi Ltd | Automatic focusing device for video camera |
-
1980
- 1980-04-18 JP JP5185180A patent/JPS56147133A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01176810U (en) * | 1988-05-31 | 1989-12-18 | ||
| JPH032707A (en) * | 1989-05-30 | 1991-01-09 | Canon Inc | Lens position controller for zoom lens |
| JPH0698240A (en) * | 1992-12-17 | 1994-04-08 | Hitachi Ltd | Automatic focusing device for video camera |
| JPH0697784B2 (en) * | 1992-12-17 | 1994-11-30 | 株式会社日立製作所 | Video camera autofocus device |
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