JPS57198502A - Disc reproducer - Google Patents

Disc reproducer

Info

Publication number
JPS57198502A
JPS57198502A JP8212981A JP8212981A JPS57198502A JP S57198502 A JPS57198502 A JP S57198502A JP 8212981 A JP8212981 A JP 8212981A JP 8212981 A JP8212981 A JP 8212981A JP S57198502 A JPS57198502 A JP S57198502A
Authority
JP
Japan
Prior art keywords
stylus
disc surface
until
cantilever
falling speed
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
JP8212981A
Other languages
Japanese (ja)
Inventor
Sadanori Fujiyama
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.)
NEC Home Electronics Ltd
NEC Corp
Original Assignee
NEC Home Electronics Ltd
Nippon Electric Co Ltd
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 NEC Home Electronics Ltd, Nippon Electric Co Ltd filed Critical NEC Home Electronics Ltd
Priority to JP8212981A priority Critical patent/JPS57198502A/en
Publication of JPS57198502A publication Critical patent/JPS57198502A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • G11B3/02—Arrangements of heads
    • G11B3/10—Arranging, supporting, or driving of heads or of transducers relatively to record carriers
    • G11B3/12—Supporting in balanced, counterbalanced or loaded operative position during transducing, e.g. loading in direction of traverse

Abstract

PURPOSE:To prevent damage on a disc surface, by driving a cantilever quickly until a stylus contacts with the disc surface and slowly until a prescribed stylus pressure is applied, through the control of a current flowing to a driving device which displaces the cantilever. CONSTITUTION:When switches 21 and 22 are opened, transistors 33, 34, 43 and 44 are conductive, a coil 16 drives a cantilever with the energizing force and a stylus falls down a disc surface 1. A time constant circuit 41 determines a falling speed of the stylus just before the contact of the stylus on the disc surface and a time constant circuit 31 determines the falling speed of the stylus until the stylus receives a prescribed stylus pressure from the above-mentioned state. Even if the falling speed of the stylus until the contact with the disc surface is increased, when the speed of application of the stylus pressure is amall, no damage is given to the disc surface.
JP8212981A 1981-05-29 1981-05-29 Disc reproducer Pending JPS57198502A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8212981A JPS57198502A (en) 1981-05-29 1981-05-29 Disc reproducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8212981A JPS57198502A (en) 1981-05-29 1981-05-29 Disc reproducer

Publications (1)

Publication Number Publication Date
JPS57198502A true JPS57198502A (en) 1982-12-06

Family

ID=13765800

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8212981A Pending JPS57198502A (en) 1981-05-29 1981-05-29 Disc reproducer

Country Status (1)

Country Link
JP (1) JPS57198502A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2543344A1 (en) * 1983-03-25 1984-09-28 Rca Corp VIDEO DRIVER HAVING A NEEDLE ELEVATOR DRIVE CIRCUIT

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5511617B2 (en) * 1975-05-01 1980-03-26

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5511617B2 (en) * 1975-05-01 1980-03-26

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2543344A1 (en) * 1983-03-25 1984-09-28 Rca Corp VIDEO DRIVER HAVING A NEEDLE ELEVATOR DRIVE CIRCUIT

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