Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1987-08-31
1989-08-15
Gonzalez, Frank
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369122, G02B 702
Patent
active
048568716
ABSTRACT:
An optical recorder such as a data recorder has an interchangeable, prealigned laser diode/lens module arrangement which can be readily replaced without complex realignment of the recorder. The module includes a cylindrical outer housing/heat-sink, and a tiltable yoke within the outer housing/heat-sink. A heat pump such as a thermoelectric element has a hot side coupled to the yoke, and also has a cold side. A combination mount is at least thermally cantilevered from the cold side of the thermoelectric element, and is thermally isolated from adjacent structures. A laser diode is bonded to a structure within the combination housing, and a lens is loosely mounted at the light-emitting end of the combination housing. The module is prealigned by operating for a period sufficient to achieve thermal stability in a fixture which is dimensionally identical to the optical recorder with which the module is to be used. When thermal stability has been achieved, the yoke is tilted, and the position of the lens is adjusted in order to achieve focus at a selected location relative to the reference plane. The lens is then secured in the selected position. That position will remain constant or substantially constant as the ambient temperature changes. This enables the optical recorder to be operated at any ambient temperature needing virtually no adjustment to the optical alignment.
REFERENCES:
patent: 4504935 (1985-03-01), Jansen
patent: 4551760 (1985-11-01), Bendell
patent: 4587563 (1986-05-01), Bendell
patent: 4685303 (1987-08-01), Branc et al.
patent: 4815059 (1989-03-01), Nakayama et al.
General Electric Company
Gonzalez Frank
Meise William H.
Smiley Raymond E.
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