EP0343844A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Disc cartridge shutters and methods of producing same
Assignee: Sony Corp
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Filing: 1989-05-17
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Granted: —
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Expires: 2009-05-17
Abstract
Abstract A shutter (6) for a disc cartridge (3) is movably attachable to the cartridge (3) which accommodates a disc (4) and has an aperture (5) for exposing a portion of the signal recording surface of the disc (4) to the outside. The shutter (6) comprises cover plates (7) for opening or closing the aperture (5) and a connecting plate (8) interconnecting the cover plates (7). A coating (14) is applied to the surfaces of at least the cover plates (7). The coating (14) elevates the reflectivity of the cover plates (7) to a value higher than that before application of the coating (14).
Inventors
- 👤 Kenji C/O Sony Magnetic Products Inc. Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 23:46
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/03; G11B23/0301; G11B23/0308
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
77 words
A disc cartridge shutter for movable attachment to a disc cartridge, the shutter (6) comprising a pair of cover plates (7) for opening or closing apertures (5) in the cartridge (3) exposing at least a portion of a signal recording surface of a disc (4) within the cartridge (3), and a connecting plate (8) interconnecting said cover plates (7), characterised in that a coating (14) is applied at least to surface portions of the cover plates (7).
Claim 2
Dependent Claim
77 words
A disc cartridge shutter for movable attachment to a disc cartridge, the shutter (6) comprising a pair of cover plates (7) for opening or closing apertures (5) in the cartridge (3) exposing at least a portion of a signal recording surface of a disc (4) within the cartridge (3), and a connecting plate (8) interconnecting said cover plates (7), characterised in that a coating (14) is applied at least to surface portions of the cover plates (7).
Claim 3
Dependent Claim
20 words
A shutter according to claim 1, wherein decorative machining (13) is performed on the surface of the cover plates (7).
Claim 4
Dependent Claim
19 words
A shutter according to claim 1 or claim 2, wherein said coating (14) comprises an epoxy type resin paint.
Claim 5
Dependent Claim
19 words
A shutter according to claim 1 or claim 2, wherein said coating (14) comprises an acryl type resin paint.
Claim 6
Dependent Claim
37 words
A shutter according to any one of the preceding claims, wherein the coating (14) has the property of elevating the reflectivity of the shutter surface to a value higher than that before application of the coating (14).
Claim 7
Dependent Claim
22 words
A disc cartridge with a shutter movably attached thereto, the shutter (6) being in accordance with any one of the preceding claims.
Claim 8
Independent Claim
137 words
A method of producing a shutter (6) for a cartridge (3) accommodating a disc (4) and having apertures (5) for exposing at least a portion of a signal recording surface of said disc (4), said shutter (6) being movably mountable on said cartridge (3) and comprising a pair of cover plates (7) for opening or closing said apertures (5) and a connecting plate (8) interconnecting said cover plates (7), the method comprising: applying a coating (14) on one side of metal plate material (20); punching said metal plate material (20) to form a plate piece in the form of the completed shutter (6) in a developed state; and bending the plate piece so that the sides having the coating (14) thereon are exposed to the outside to form the cover plates (7) and the connecting plate (8).
Claim 9
Independent Claim
137 words
A method of producing a shutter (6) for a cartridge (3) accommodating a disc (4) and having apertures (5) for exposing at least a portion of a signal recording surface of said disc (4), said shutter (6) being movably mountable on said cartridge (3) and comprising a pair of cover plates (7) for opening or closing said apertures (5) and a connecting plate (8) interconnecting said cover plates (7), the method comprising: applying a coating (14) on one side of metal plate material (20); punching said metal plate material (20) to form a plate piece in the form of the completed shutter (6) in a developed state; and bending the plate piece so that the sides having the coating (14) thereon are exposed to the outside to form the cover plates (7) and the connecting plate (8).
Claim 10
Independent Claim
125 words
A method of producing a shutter (6) for a cartridge (3) accommodating a disc (4) and having apertures (5) for exposing at least a portion of a signal recording surface of said disc (4), said shutter (6) being movably mountable on said cartridge (3) and comprising a pair of cover plates (7) for opening or closing said apertures (5) and a connecting plate (8) interconnecting said cover plates (7), said method comprising: punching metal plate material to form a plate piece in the form of the completed shutter (6) in a developed state; bending the plate piece to form the cover plates (7) and the connecting plate (8); and applying a coating (14) at least to the outer lateral sides of the cover plates (7).
Claim 11
Independent Claim
125 words
A method of producing a shutter (6) for a cartridge (3) accommodating a disc (4) and having apertures (5) for exposing at least a portion of a signal recording surface of said disc (4), said shutter (6) being movably mountable on said cartridge (3) and comprising a pair of cover plates (7) for opening or closing said apertures (5) and a connecting plate (8) interconnecting said cover plates (7), said method comprising: punching metal plate material to form a plate piece in the form of the completed shutter (6) in a developed state; bending the plate piece to form the cover plates (7) and the connecting plate (8); and applying a coating (14) at least to the outer lateral sides of the cover plates (7).
Claim 12
Dependent Claim
36 words
A method according to claim 7 or claim 8, wherein said coating (14) has the property of elevating the reflectivity of the shutter surface to a value higher than that before application of the coating (14).
References Cited (Backward Citations)
No citation records indexed.
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