JPS5514583A - Protective unit for focus lens - Google Patents
Protective unit for focus lensInfo
- Publication number
- JPS5514583A JPS5514583A JP8800278A JP8800278A JPS5514583A JP S5514583 A JPS5514583 A JP S5514583A JP 8800278 A JP8800278 A JP 8800278A JP 8800278 A JP8800278 A JP 8800278A JP S5514583 A JPS5514583 A JP S5514583A
- Authority
- JP
- Japan
- Prior art keywords
- disc
- lens
- focus lens
- amplifier
- focus
- 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
Abstract
PURPOSE: To avoid the contact between the lens and the disc, by driving upward the focus lens depending on the signal representing the focus state, in optical type video disc players.
CONSTITUTION: The signal produced accompanied with the change in the shape of beam spot is fed to the terminals 1 and 2, it is delivered to the focus control amplifier 22, and the signal at the terminal 2 is fed to Q1 and Q2 via the amplifier 30 and the comparator 31, and the collector Y of Q2 is connected to the input of the amplifier 19. As a result, the output of the amplifiers 19 and 22 increases toward positive direction at out-focussing to drive the focus lens upward so that it is apart from the disc. Accordingly, the contact between the lens and the disc can quickly be avoided.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8800278A JPS5514583A (en) | 1978-07-19 | 1978-07-19 | Protective unit for focus lens |
GB7924345A GB2027881B (en) | 1978-07-19 | 1979-07-12 | In-focus detecting device |
DE19792929049 DE2929049A1 (en) | 1978-07-19 | 1979-07-18 | DEVICE FOR DETECTING THE FOCUS |
US06/058,647 US4286147A (en) | 1978-07-19 | 1979-07-19 | In-focus detecting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8800278A JPS5514583A (en) | 1978-07-19 | 1978-07-19 | Protective unit for focus lens |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5514583A true JPS5514583A (en) | 1980-02-01 |
JPS6227454B2 JPS6227454B2 (en) | 1987-06-15 |
Family
ID=13930567
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8800278A Granted JPS5514583A (en) | 1978-07-19 | 1978-07-19 | Protective unit for focus lens |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5514583A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5187271U (en) * | 1975-01-08 | 1976-07-13 |
-
1978
- 1978-07-19 JP JP8800278A patent/JPS5514583A/en active Granted
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5187271U (en) * | 1975-01-08 | 1976-07-13 | ||
JPS5655877Y2 (en) * | 1975-01-08 | 1981-12-26 |
Also Published As
Publication number | Publication date |
---|---|
JPS6227454B2 (en) | 1987-06-15 |
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