Patent US3977684A successfully refreshed from Google Patents.
US3977684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Playback apparatus, in particular a video player
Assignee: US Philips Corp
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Filing: 1975-10-20
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Granted: 1976-08-31
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Expires: 1995-10-20
Abstract
Abstract A playback apparatus, in particular a video player, for playing back round disks, which are provided with information tracks which are optically readable with the aid of a read beam obtained from a light source, and having a housing which comprises a substantially flat covering plate and an optical focussing device movable to and fro in a slot in the covering plate. In view of the safety of the apparatus and for other, such as aesthetical, reasons the slot is closed by a closing element in every position of the focussing device, which element is connected to the focussing device and for example consists of a flexible strip of a width greater than the width of the slot.
Inventors
- 👤 Eduard Camerik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:37
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/32; G11B7/00; G11B7/002; G11B7/0037; G11B7/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
163 words
A playback apparatus, in particular a video player (1), for playing back a round disk (6), which is provided with information tracks which are optically readable with the aid of a read beam obtained from a radiation source, in particular a laser, and comprising a housing (2) with a substantially flat covering plate (3) in which a slot (13) is formed, a motor-driven drive spindle (12) which projects from the housing for rotating the disk (6) parallel to and above the covering plate (3), an optical focussing device (10), which is radially movable relative to the drive spindle in the housing and substantially underneath the covering plate (3), for projecting the read beam onto the information tracks, which focussing device (10) is movable substantially underneath the slot (13), and also including a closing element which closes the slot in every position of the focussing device said closing element (17) being connected to the focussing device and movable therewith relative to the housing (2).
Claim 2
Dependent Claim
163 words
A playback apparatus, in particular a video player (1), for playing back a round disk (6), which is provided with information tracks which are optically readable with the aid of a read beam obtained from a radiation source, in particular a laser, and comprising a housing (2) with a substantially flat covering plate (3) in which a slot (13) is formed, a motor-driven drive spindle (12) which projects from the housing for rotating the disk (6) parallel to and above the covering plate (3), an optical focussing device (10), which is radially movable relative to the drive spindle in the housing and substantially underneath the covering plate (3), for projecting the read beam onto the information tracks, which focussing device (10) is movable substantially underneath the slot (13), and also including a closing element which closes the slot in every position of the focussing device said closing element (17) being connected to the focussing device and movable therewith relative to the housing (2).
Claim 3
Dependent Claim
79 words
A playback apparatus as claimed in claim 1, characterized in that the closing element (17) is disposed underneath the slot and comprises a flexible strip having a width greater than the width of the slot, whilst the strip near the ends of the slot is passed over guide elements (18-21) which extend transversely to the radial direction of movement of the focussing device and which substantially forms a loop, the ends of the strip being loaded by resilient means.
Claim 4
Dependent Claim
27 words
A playback apparatus as claimed in claim 2, characterized in that the guide elements (18-21) consist of rollers journalled in supports which are connected to the deck.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |