EP0277809A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Disc cartridges
Assignee: Sony Corp
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Filing: 1988-02-02
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Granted: —
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Expires: 2008-02-02
Abstract
Abstract A disc cartridge (21) includes a clamper (40) of synthetic material rotatably mounted to a disc cartridge half (23) and a magnetic plate (41) secured to the clamper (40). A plurality of projections (42) are formed in the magnetic plate (41). The clamper (40) is integrally formed with a recess (44) for accommodating the magnetic plate (41) and a plurality of hooks (49) formed along the peripheral wall (45) of the recess (44). The projections (42) are engaged with respective hooks (49) to secure the magnetic plate (41) to the clamper (40) without the need to utilise ultrasonic welding.
Inventors
- 👤 Kiyonori Sakaguchi
- 👤 Makio Takaiwa
- 👤 Akira C/O Patent Division Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 11:31
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/03; G11B23/0014; G11B23/0021; G11B23/0028; G11B23/0035; G11B23/0301; G11B23/0317
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
99 words
A disc cartridge (21) comprising a clamper (40) of synthetic material mounted for rotation to a disc cartridge half (23) and a magnetic plate (41) secured to the clamper (40), wherein a plurality of projections (42) are formed in the magnetic plate (41), the clamper (40) having a recess (44) for accommodating the magnetic plate (41) and a plurality of hook means (50) formed along a peripheral wall (45) of the recess (44), the projections (42) in the magnetic plate (41) being respectively engaged with the hook means (50) to secure the magnetic plate (41) to the clamper (40).
Claim 2
Dependent Claim
99 words
A disc cartridge (21) comprising a clamper (40) of synthetic material mounted for rotation to a disc cartridge half (23) and a magnetic plate (41) secured to the clamper (40), wherein a plurality of projections (42) are formed in the magnetic plate (41), the clamper (40) having a recess (44) for accommodating the magnetic plate (41) and a plurality of hook means (50) formed along a peripheral wall (45) of the recess (44), the projections (42) in the magnetic plate (41) being respectively engaged with the hook means (50) to secure the magnetic plate (41) to the clamper (40).
Claim 3
Dependent Claim
98 words
A disc cartridge according to claim 1, wherein the magnetic plate is a disc (41), the peripheral wall (45) of the recess (44) being contoured to conform to the disc (41) and being composed of a plurality of peripheral wall sections (46) separated by a predetermined distance from each other, the wall sections (46) each including a hook (49) and a leg (48) separated by a predetermined distance from a bottom wall section (47) of the clamper (40), the leg (48) being substantially parallel to the bottom wall section (47) and extending tangentially of the peripheral wall (45).
Claim 4
Dependent Claim
25 words
A disc cartridge according to claim 1 or claim 2, wherein each projection (42) has a thickness less than that of the magnetic plate (41).
Claim 5
Dependent Claim
24 words
A disc cartridge according to claim 3, wherein each projection (42) has a thickness not more than half that of the magnetic plate (41).
Claim 6
Dependent Claim
31 words
A disc cartridge according to any one of the preceding claims, wherein the magnetic plate (41) includes a groove (43) into which a tool for an attachment operation can be engaged.
Claim 7
Dependent Claim
31 words
A disc cartridge according to claim 5, wherein an opening (51) is provided in the bottom wall section (47) of the clamper (40) at a position facing the hook means (50).
References Cited (Backward Citations)
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