Dynamic information storage or retrieval – With particular cabinet structure – With mechanism to place disc on a turntable
Patent
1985-08-27
1987-09-22
Stephan, Steven L.
Dynamic information storage or retrieval
With particular cabinet structure
With mechanism to place disc on a turntable
369239, 369267, G11B 1704
Patent
active
046959955
ABSTRACT:
A front loading disk player of a type capable of playing disks of different diameters wherein the diameter and proper loading of the disk can be detected at all times with a simple sensor arrangement. The inventive disk player includes a housing, a playing mechanism provided in the housing and including an optical pickup and a turntable, the turntable including a tapered wheel received in the center hole of the disk, a disk conveying mechanism for conveying disks to the playing position, and a clamping mechanism for clamping disks conveyed to the playing position against the turntable. A detector detects the fact that the disk has been clamped against the turntable. This detector further includes a sensor having a detecting point within a range defined outside the outer circumference of the turntable and inside the outer circumference of the smallest diameter disk with the center of the rotary shaft of the turntable as the center of the smallest diameter disk, the range excluding a portion encompassed by a locus of cylinders having a diameter equal to that of the smallest disk circumscribing a reading spot on a locus of reading spots of the optical pickup and being tangent to the outer circumference of the tapered wheel. Further, a second sensor may be provided for detecting the presence of disks of diameter larger than the smallest diameter, the second sensor having a detecting point disposed separately from the detecting point of the first sensor by a distance equal to or larger than the outer diameter of the smallest diameter disk.
REFERENCES:
patent: 3941392 (1976-03-01), Grosemans et al.
patent: 4062547 (1977-12-01), Dorren
patent: 4403317 (1983-09-01), Suzuki et al.
patent: 4416003 (1983-11-01), Suzuki
patent: 4564930 (1986-01-01), Funabashi et al.
Pioneer Electronic Corporation
Stephan Steven L.
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