JPS5497055A - Automatic focusing device - Google Patents
Automatic focusing deviceInfo
- Publication number
- JPS5497055A JPS5497055A JP401378A JP401378A JPS5497055A JP S5497055 A JPS5497055 A JP S5497055A JP 401378 A JP401378 A JP 401378A JP 401378 A JP401378 A JP 401378A JP S5497055 A JPS5497055 A JP S5497055A
- Authority
- JP
- Japan
- Prior art keywords
- laser
- output
- lens
- optical axis
- focusing operation
- 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
- Automatic Focus Adjustment (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE: To make it possible to accomplish the stable automatic focusing operation, while facilitating the adjustment of an optical system, by using a semiconductor laser as a light source to vibrate the same in the direction of the optical axis.
CONSTITUTION: The laser beam 2 from a semiconductor laser is condensed upon the surface of a video disc 4 by the action of an objective lens 3. The reflected light is into a light emitting portion of the laser 14 so that the resultantly varied output of the laser 14 is subjected to signal processing at 16, after it is optically detected at 8, thereby to effect a video reproduction. In this instance, the oscillator 11 excites a vibrator 9 so that the laser 14 is vibrated with a preset frequency f in the optical axis direction. As a result, the frequency f is inverted in phase in the displacement of the surface of the disc 4 from the focal point of the lens 3, and the lens 3 is moved in the direction of arrow A through an actuator 13 by the output which is produced by effecting the phase detection of the output of the detector 8 so that the focusing operation can be automatically.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP401378A JPS5497055A (en) | 1978-01-17 | 1978-01-17 | Automatic focusing device |
NL7812058A NL186121C (en) | 1977-12-16 | 1978-12-12 | AUTOMATIC FOCUSING DEVICE. |
DE7979900037T DE2862256D1 (en) | 1977-12-16 | 1978-12-13 | Automatic focusing system |
PCT/JP1978/000052 WO1979000400A1 (en) | 1977-12-16 | 1978-12-13 | Automatic focusing system |
EP79900037A EP0007902B1 (en) | 1977-12-16 | 1979-07-16 | Automatic focusing system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP401378A JPS5497055A (en) | 1978-01-17 | 1978-01-17 | Automatic focusing device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5497055A true JPS5497055A (en) | 1979-07-31 |
JPS6243254B2 JPS6243254B2 (en) | 1987-09-12 |
Family
ID=11573077
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP401378A Granted JPS5497055A (en) | 1977-12-16 | 1978-01-17 | Automatic focusing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5497055A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4862442A (en) * | 1987-04-20 | 1989-08-29 | Mitsubishi Denki Kabushiki Kaisha | Focus detecting apparatus utilizing reflecting surface having variable reflectivity or transmissivity |
JP2008511093A (en) * | 2004-08-23 | 2008-04-10 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Focus control for media scanning system |
-
1978
- 1978-01-17 JP JP401378A patent/JPS5497055A/en active Granted
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4862442A (en) * | 1987-04-20 | 1989-08-29 | Mitsubishi Denki Kabushiki Kaisha | Focus detecting apparatus utilizing reflecting surface having variable reflectivity or transmissivity |
JP2008511093A (en) * | 2004-08-23 | 2008-04-10 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Focus control for media scanning system |
Also Published As
Publication number | Publication date |
---|---|
JPS6243254B2 (en) | 1987-09-12 |
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