EP0387047A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Magneto-optical recording apparatus
Assignee: Sony Corp
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Filing: 1990-03-08
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Granted: —
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Expires: 2010-03-08
Abstract
Abstract In magneto-optical disc recording apparatus a magneto-optical disc (D) is recorded by irradiating it with a recording light beam from an optical pickup head device (5) while an external magnetic field is applied by external magnetic field generating means (8). To ensure close proximity of the magnetic field generating means (8) to the disc (D) and uniform spacing therefrom, a spacer sheet (4) is located over the face of the magneto-optical disc (D) on which the magnetic field generating means (8) acts.
Inventors
- 👤 Hirotoshi C/O Patents Division Fujisawa
- 👤 Takashi C/O Patents Division Ohmori
- 👤 Ryo C/O Patents Division Ando
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 13:18
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B17/00; G11B17/02; G11B17/04; G11B17/041; G11B17/044; G11B17/046; G11B11/00; G11B11/10; G11B11/105; G11B11/1055; G11B11/10556; G11B11/10558; G11B11/10576; G11B17/022; G11B17/028; G11B17/032; G11B17/05; G11B17/053; G11B17/054; G11B17/32
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
92 words
Magneto-optical disc recording apparatus in which a magneto-optical disc (D) can be recorded by irradiating it with a recording light beam from an optical pickup head device (5, 219, 331) while the magneto-optical disc (D) is subjected to an external magnetic field by external magnetic field generating means (6, 213, 322), the magneto-optical disc recording apparatus comprising a spacer sheet (4, 25, 36) to be mounted on the magneto-optical disc (D) and the external magnetic field generating means (6, 213, 322) being brought into contact with the spacer sheet (4, 25, 36).
Claim 2
Dependent Claim
92 words
Magneto-optical disc recording apparatus in which a magneto-optical disc (D) can be recorded by irradiating it with a recording light beam from an optical pickup head device (5, 219, 331) while the magneto-optical disc (D) is subjected to an external magnetic field by external magnetic field generating means (6, 213, 322), the magneto-optical disc recording apparatus comprising a spacer sheet (4, 25, 36) to be mounted on the magneto-optical disc (D) and the external magnetic field generating means (6, 213, 322) being brought into contact with the spacer sheet (4, 25, 36).
Claim 3
Dependent Claim
46 words
Magneto-optical disc recording apparatus according to claim 1, wherein the spacer sheet (4, 25, 36) is opposed to the magneto-optical disc (D) on its surface opposite to its surface on which the recording light beam from the optical pickup head device (5, 219, 331) is incident.
Claim 4
Dependent Claim
37 words
Magneto-optical disc recording apparatus according to claim 1 or claim 2, including spring-biasing means (8, 327) whereby the external magnetic field generating means (6, 213, 322) is spring-biased into contact with the spacer sheet (4, 25, 36).
Claim 5
Dependent Claim
31 words
Magneto-optical disc recording apparatus according to any one of claims 1 to 3, wherein the spacer sheet (4, 25, 36) is formed of a material which has a smooth surface property.
Claim 6
Dependent Claim
37 words
Magneto-optical disc recording apparatus according to any one of claims 1 to 4, wherein the spacer sheet (4, 25, 36) is made of a flexible material so that it can closely adhere to the magneto-optical disc (D).
Claim 7
Dependent Claim
68 words
Magneto-optical disc recording apparatus according to any one of claims 1 to 5, including rotary holding means (1, 3, 22, 24, 32, 35) to rotate the magneto-optical disc (D) with the magneto-optical disc (D) held by the rotary holding means, wherein when the magneto-optical disc (D) is held by the rotary holding means, the spacer sheet (4, 25, 36) is unitarily rotated together with the magneto-optical disc (D).
Claim 8
Dependent Claim
42 words
Magneto-optical disc recording apparatus according to claim 6, wherein the rotary holding means comprises a chucking plate (3, 24, 35) and a turntable (1, 22, 32), and the spacer sheet (4, 25, 36) is secured to the chucking plate (3, 24, 35).
Claim 9
Dependent Claim
55 words
Magneto-optical disc recording apparatus according to claim 6 or claim 7, wherein the rotary holding means includes releasing means (26) to release the spacer sheet (4, 25, 36) from the magneto-optical disc (D) when the rotary holding means (1, 3, 22, 24, 32, 35) is changed from holding the magneto-optical disc to a non-holding state.
Claim 10
Dependent Claim
61 words
Magneto-optical disc recording apparatus according to claim 8, wherein the releasing means (26) includes a movable member (216) to move the magneto-optical disc (D) so that the magneto-optical disc is spaced apart from the spacer sheet (4, 25, 36) when the rotary holding means (1, 3, 22, 24, 32, 35) is changed from holding the magneto-optical disc to a non-holding state.
Claim 11
Dependent Claim
39 words
Magneto-optical disc recording apparatus according to any one of claims 1 to 9, further comprising protecting means (38) to protect the spacer sheet (4, 25, 36) when the magneto-optical disc (D) is inserted into and/or ejected from the apparatus.
Claim 12
Dependent Claim
41 words
Magneto-optical disc recording apparatus according to claim 10, wherein the protecting means is a disc tray (38) to prevent the magneto-optical disc (D) from contacting the spacer sheet (36) when the magneto-optical disc is loaded onto and/or ejected from the apparatus.
Claim 13
Dependent Claim
159 words
Magneto-optical disc recording apparatus comprising: an apparatus body (102, 33) including an optical pickup head device (5, 219, 331) to irradiate a magneto-optical disc (D) with a recording light beam while the magneto-optical disc (D) is subjected to an external magnetic field and rotary drive means (1, 22, 32) to rotate the magneto-optical disc (D); and a lid (211, 34) rotatably attached to the apparatus body (102, 33) and including external magnetic field generating means (6, 213, 322) to apply an external magnetic field to the magneto-optical disc (D), holding means (3, 24, 35) to hold the magneto-optical disc (D) together with the rotary drive means (1, 22, 32) so that the magneto-optical disc (D) can be rotated, and a position control member (4, 25, 36) to control the position of the external magnetic field generating means (6, 213, 322) so that a distance between the external magnetic field generating means and the magneto-optical disc (D) is maintained constant.
Claim 14
Dependent Claim
159 words
Magneto-optical disc recording apparatus comprising: an apparatus body (102, 33) including an optical pickup head device (5, 219, 331) to irradiate a magneto-optical disc (D) with a recording light beam while the magneto-optical disc (D) is subjected to an external magnetic field and rotary drive means (1, 22, 32) to rotate the magneto-optical disc (D); and a lid (211, 34) rotatably attached to the apparatus body (102, 33) and including external magnetic field generating means (6, 213, 322) to apply an external magnetic field to the magneto-optical disc (D), holding means (3, 24, 35) to hold the magneto-optical disc (D) together with the rotary drive means (1, 22, 32) so that the magneto-optical disc (D) can be rotated, and a position control member (4, 25, 36) to control the position of the external magnetic field generating means (6, 213, 322) so that a distance between the external magnetic field generating means and the magneto-optical disc (D) is maintained constant.
Claim 15
Dependent Claim
20 words
Magneto-optical disc recording apparatus according to claim 12, wherein the position control member is a spacer sheet (4, 25, 36).
Claim 16
Dependent Claim
44 words
Magneto-optical disc recording apparatus according to claim 13, wherein the spacer sheet (4, 25, 36) engages the magneto-optical disc at a surface thereof opposite to a surface on which the recording light beam from the optical pickup head device (5, 219, 331) is incident.
Claim 17
Dependent Claim
43 words
Magneto-optical disc recording apparatus according to claim 13, including spring-biasing means (8, 327) whereby the external magnetic field generating means is spring-biased in a direction such that the external magnetic field generating means (6, 213, 322) contacts the spacer sheet (4, 25, 36).
Claim 18
Dependent Claim
26 words
Magneto-optical disc recording apparatus according to claim 13, wherein the spacer sheet (4, 25, 36) is formed of a material which has a smooth surface property.
Claim 19
Dependent Claim
32 words
Magneto-optical disc recording apparatus according to claim 13, wherein the spacer sheet (4, 25, 36) is formed of a flexible material so that it can closely adhere to the magneto-optical disc (D).
Claim 20
Dependent Claim
45 words
Magneto-optical disc recording apparatus according to claim 13, wherein the spacer sheet (4, 25, 36) is unitarily rotated with the magneto-optical disc (D) when the magneto-optical disc (D) is held by the rotary drive means (1, 22, 32) and the holding means (3, 24, 35).
Claim 21
Dependent Claim
24 words
Magneto-optical disc recording apparatus according to claim 18, wherein the spacer sheet (4, 25, 36) is secured to the holding means (3, 24, 35).
Claim 22
Dependent Claim
48 words
Magneto-optical disc recording apparatus according to claim 12, wherein the holding means (3, 24, 35) includes releasing means (26) to release the spacer sheet (4, 25, 36) from the magneto-optical disc (D) when the holding means is changed from a magneto-optical disc holding state to a non-holding state.
Claim 23
Dependent Claim
56 words
Magneto-optical disc recording apparatus according to claim 20, wherein the releasing means (26) includes a movable member (216) to move the magneto-optical disc (D) such that the magneto-optical disc (D) is spaced apart from the spacer sheet (4, 25, 36) when the holding means is changed from the magneto-optical disc holding state to the non-holding state.
Claim 24
Dependent Claim
34 words
Magneto-optical disc recording apparatus according to claim 13, wherein the lid (211, 34) includes protecting means (38) to protect the spacer sheet when the magneto-optical disc is inserted into and/or ejected from the apparatus.
Claim 25
Dependent Claim
41 words
Magneto-optical disc recording apparatus according to claim 22, wherein the protecting means is a disc tray (38) to prevent the magneto-optical disc (D) contacting the spacer sheet (36) when the magneto-optical disc (D) is inserted into and/or ejected from the apparatus.
References Cited (Backward Citations)
No citation records indexed.
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