JPS5514582A - Protective unit for focus lens - Google Patents

Protective unit for focus lens

Info

Publication number
JPS5514582A
JPS5514582A JP8800178A JP8800178A JPS5514582A JP S5514582 A JPS5514582 A JP S5514582A JP 8800178 A JP8800178 A JP 8800178A JP 8800178 A JP8800178 A JP 8800178A JP S5514582 A JPS5514582 A JP S5514582A
Authority
JP
Japan
Prior art keywords
disc
focus
lens
focus lens
protective unit
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
Application number
JP8800178A
Other languages
Japanese (ja)
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 JP8800178A priority Critical patent/JPS5514582A/en
Publication of JPS5514582A publication Critical patent/JPS5514582A/en
Pending legal-status Critical Current

Links

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

PURPOSE: To avoid the contact between the lens and the disc, by driving the lens toward opposite direction compulsively, if the focus lens is too close to the disc, in optical type video disc players.
CONSTITUTION: Q2 is turned on and off accompanied with the turning on and off of Q1 by the presence(in-, out-focus) of the AC component output of the focus control amplifier 22, the collector Y potential increases the output of the amplifier 19 and the control amplifier 22 toward positive direction at out-focus to drive the focus lens apart from the disc. Accordingly, if the focus lens and the disc are too close each other, the lens is compulsively driven upward to avoid the contact with the disc.
COPYRIGHT: (C)1980,JPO&Japio
JP8800178A 1978-07-19 1978-07-19 Protective unit for focus lens Pending JPS5514582A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8800178A JPS5514582A (en) 1978-07-19 1978-07-19 Protective unit for focus lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8800178A JPS5514582A (en) 1978-07-19 1978-07-19 Protective unit for focus lens

Publications (1)

Publication Number Publication Date
JPS5514582A true JPS5514582A (en) 1980-02-01

Family

ID=13930536

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8800178A Pending JPS5514582A (en) 1978-07-19 1978-07-19 Protective unit for focus lens

Country Status (1)

Country Link
JP (1) JPS5514582A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50136673A (en) * 1974-04-19 1975-10-30

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50136673A (en) * 1974-04-19 1975-10-30

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