JPS5514581A - In-focus detection unit - Google Patents
In-focus detection unitInfo
- Publication number
- JPS5514581A JPS5514581A JP8799978A JP8799978A JPS5514581A JP S5514581 A JPS5514581 A JP S5514581A JP 8799978 A JP8799978 A JP 8799978A JP 8799978 A JP8799978 A JP 8799978A JP S5514581 A JPS5514581 A JP S5514581A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- focus
- terminal
- outputted
- focus lens
- 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)
- Optical Recording Or Reproduction (AREA)
- Control Of Position Or Direction (AREA)
Abstract
PURPOSE:To obtain accurate focus signal quickly with reduced malfunction, by detecting the signal representing the focus state from the output of the focus control amplifier, in video disc players. CONSTITUTION:The signal produced accompanied with the change in the shape of beam spot formed on the photo detection element split into four, for example, is fed to the terminals 1 and 2, and it is delivered to the focus control amplifier 22. Further, when the focus lens approaches from the reference position to the disc, the up-signal of focus lens is outputted to the terminal 23 and when apart, the focus lens down-signal is outputted. The focus lens is oscillated up and down by taking the reference signal as a center. Further, Q1 is turned off with the negative AC component at the terminal 23, then the in-focus signal is obtained at the terminal 24, and if the AC component is not outputted at the terminal 23, Q1 is turned on and the out-focus signal is obtained.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8799978A JPS5514581A (en) | 1978-07-19 | 1978-07-19 | In-focus detection unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8799978A JPS5514581A (en) | 1978-07-19 | 1978-07-19 | In-focus detection unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5514581A true JPS5514581A (en) | 1980-02-01 |
Family
ID=13930479
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8799978A Pending JPS5514581A (en) | 1978-07-19 | 1978-07-19 | In-focus detection unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5514581A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57127207U (en) * | 1981-01-30 | 1982-08-07 | ||
JPS57195901U (en) * | 1981-06-08 | 1982-12-11 |
-
1978
- 1978-07-19 JP JP8799978A patent/JPS5514581A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57127207U (en) * | 1981-01-30 | 1982-08-07 | ||
JPH0341287Y2 (en) * | 1981-01-30 | 1991-08-30 | ||
JPS57195901U (en) * | 1981-06-08 | 1982-12-11 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
A711 | Notification of change in applicant |
Free format text: JAPANESE INTERMEDIATE CODE: A711 Effective date: 20050606 |
|
A72 | Notification of change in name of applicant |
Free format text: JAPANESE INTERMEDIATE CODE: A721 Effective date: 20050606 |
|
A711 | Notification of change in applicant |
Free format text: JAPANESE INTERMEDIATE CODE: A711 Effective date: 20051006 |