JPS5514583A - Protective unit for focus lens - Google Patents

Protective unit for focus lens

Info

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
Application number
JP8800278A
Other languages
Japanese (ja)
Other versions
JPS6227454B2 (en
Inventor
Hiroaki Tsuboi
Toshihiko Hosaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pioneer Video Corp
Universal Pioneer Corp
Original Assignee
Pioneer Video Corp
Universal Pioneer Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pioneer Video Corp, Universal Pioneer Corp filed Critical Pioneer Video Corp
Priority to JP8800278A priority Critical patent/JPS5514583A/en
Priority to GB7924345A priority patent/GB2027881B/en
Priority to DE19792929049 priority patent/DE2929049A1/en
Priority to US06/058,647 priority patent/US4286147A/en
Publication of JPS5514583A publication Critical patent/JPS5514583A/en
Publication of JPS6227454B2 publication Critical patent/JPS6227454B2/ja
Granted legal-status Critical Current

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
JP8800278A 1978-07-19 1978-07-19 Protective unit for focus lens Granted JPS5514583A (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5187271U (en) * 1975-01-08 1976-07-13

Cited By (2)

* Cited by examiner, † Cited by third party
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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