EP0368242A2
Expired / Lapsed
EP
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An optical disk apparatus
Assignee: Hitachi Ltd
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Filing: 1989-11-07
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Granted: —
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Expires: 2009-11-07
Abstract
Abstract An optical disk apparatus comprises a casing, an optical head for reading out a signal recorded on an optical disk, a circuit for processing a signal from the optical head, a turn table for rotating the optical disk. The optical head includes an optical pickup having an objective. The apparatus further includes a brush and a motor for reciprocating the objective with respective to the brush. A control circuit in the apparatus controls and operates the motor so as to drive the objective, thereby removing dust accumulated on the objective before the signal read-out operation becomes impossible.
Inventors
- 👤 Kazumasa Ohiso
- 👤 Mitsuo Satake
- 👤 Akira Ikuma
- 👤 Sigeki Mori
- 👤 Tomoki Hirata
- 👤 Shinichi Usami
- 👤 Takashi Enoki
- 👤 Tatsuo Baba
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 00:17
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/02; G11B17/04; G11B17/041; G11B17/043; G11B17/0438; G11B23/00; G11B23/50; G11B23/505; G11B23/507; G11B7/00; G11B7/08; G11B7/085; G11B7/0857; G11B7/08582; G11B7/12; G11B7/121
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
76 words
An optical disk apparatus comprising: a casing; means for reading out a signal recorded on a recording medium on an optical disk, including an optical pickup having an objective, said read-out means being housed in said casing; means for processing a signal from said read-out means; means for rotating said optical disk; a brush; means for driving said objective and/or said brush to provide a relative sliding movement therebetween; and means for controlling said driving means.
Claim 2
Dependent Claim
76 words
An optical disk apparatus comprising: a casing; means for reading out a signal recorded on a recording medium on an optical disk, including an optical pickup having an objective, said read-out means being housed in said casing; means for processing a signal from said read-out means; means for rotating said optical disk; a brush; means for driving said objective and/or said brush to provide a relative sliding movement therebetween; and means for controlling said driving means.
Claim 3
Dependent Claim
49 words
An apparatus according to Claim 1, wherein said controlling means includes a comparator for compare an amplitude level of said read signal from said read-out means with a reference level, and wherein said controlling means operates said driving means when said amplitude level become lower than said reference level.
Claim 4
Dependent Claim
56 words
An apparatus according to Claim 1, wherein said optical pickup further includes an actuator for focusing said objective, and wherein said controlling means operates said focusing actuator to move said objective in a direction perpendicular to a plane of said relative movement between said objective and said brush so as to obtain a close contact therebetween.
Claim 5
Dependent Claim
18 words
An apparatus according to Claim 1, wherein said driving means can reciprocate said objective relative to said brush.
Claim 6
Dependent Claim
18 words
An apparatus according to Claim 1, wherein said driving means can reciprocate said brush relative to said objective.
Claim 7
Dependent Claim
11 words
An apparatus according to Claim 1, wherein said brush is replaceable.
Claim 8
Dependent Claim
29 words
An apparatus according to Claim 1, wherein said casing is provided with an opening which is closable and through which said objective is accessible from outside of said casing.
Claim 9
Dependent Claim
101 words
An optical disk apparatus according comprising: a casing; means for reading out a signal recorded on a recording medium on an optical disk, including an optical pickup having an objective; means for processing a signal from said read-out means; means for rotating said optical disk; a brush; and means for driving said brush to provide a relative sliding movement between said brush and said objective, said driving means including a member which is reciprocative close to and apart from said objective in corresponse to a disk loading and a disk unloading operations, and to which member said brush is replaceably attached.
Claim 10
Dependent Claim
101 words
An optical disk apparatus according comprising: a casing; means for reading out a signal recorded on a recording medium on an optical disk, including an optical pickup having an objective; means for processing a signal from said read-out means; means for rotating said optical disk; a brush; and means for driving said brush to provide a relative sliding movement between said brush and said objective, said driving means including a member which is reciprocative close to and apart from said objective in corresponse to a disk loading and a disk unloading operations, and to which member said brush is replaceably attached.
Claim 11
Dependent Claim
21 words
An apparatus according to Claim 1, wherein said controlling means makes said driving means inoperative during rotation of said optical disk.
Claim 12
Dependent Claim
21 words
An apparatus according to Claim 8, wherein said controlling means makes said driving means inoperative during rotation of said optical disk.
Claim 13
Dependent Claim
29 words
An apparatus according to Claim 8, wherein said casing is provided with an opening which is closable and through which said objective is accessible from outside of said casing.
Claim 14
Dependent Claim
120 words
An optical disk apparatus to be connected to another unit, said apparatus comprising: means for reading out a signal recorded on a recording medium on an optical disk, including an optical pickup having an objective; means for processing a signal from said read-out means; a brush; means for driving said objective and/or said brush to provide a relative sliding movement there between; and means for controlling said driving means, said controlling means including means for detecting a decrement of an amplitude level of said read signal respect to an original one, means for delivering said decrement to said another unit in response to demands therefrom, and means for operating said driving means in response to commands from said another unit.
Claim 15
Dependent Claim
120 words
An optical disk apparatus to be connected to another unit, said apparatus comprising: means for reading out a signal recorded on a recording medium on an optical disk, including an optical pickup having an objective; means for processing a signal from said read-out means; a brush; means for driving said objective and/or said brush to provide a relative sliding movement there between; and means for controlling said driving means, said controlling means including means for detecting a decrement of an amplitude level of said read signal respect to an original one, means for delivering said decrement to said another unit in response to demands therefrom, and means for operating said driving means in response to commands from said another unit.
Claim 16
Dependent Claim
102 words
An optical disk apparatus comprising: means for reading out a signal recorded on a recording medium on an optical disk, including an optical pickup having an objective; means for processing a signal from said read-out means; a brush; means for driving said objective and/or said brush to provide a relative sliding movement there between; and means for controlling said driving means, said controlling means including means for detecting a decrement of an amplitude level of said read signal respect to an original one, means for notifying said decrement outside, and means for operating said driving means in response to commands from outside.
Claim 17
Dependent Claim
102 words
An optical disk apparatus comprising: means for reading out a signal recorded on a recording medium on an optical disk, including an optical pickup having an objective; means for processing a signal from said read-out means; a brush; means for driving said objective and/or said brush to provide a relative sliding movement there between; and means for controlling said driving means, said controlling means including means for detecting a decrement of an amplitude level of said read signal respect to an original one, means for notifying said decrement outside, and means for operating said driving means in response to commands from outside.
Claim 18
Dependent Claim
57 words
An apparatus according to Claim 1 or 8, wherein said casing is provided with a mouth through which said optical disk is to be inserted into said apparatus, and wherein said apparatus further comprises barrier wall means which is disposed intermediate between said mouth and said optical pickup and which encloses said optical pickup at least partially.
References Cited (Backward Citations)
No citation records indexed.
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