Radiant energy – Photocells; circuits and apparatus – Housings
Patent
1990-12-21
1992-07-21
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Housings
369 4415, H01J 502
Patent
active
051325349
ABSTRACT:
An information reading device is used as an optical pickup in a compact disk player or the like for playing back an optical disk. The optical pickup has an adjusting fulcrum about which a base supported on a base mount can be turned with respect to the base mount, a first adjusting screw for angularly adjusting the position of the base with respect to the base mount in a tangential direction of the disk, and a second adjusting screw for angularly adjusting the position of the base with respect to the base mount in a radial direction of the disk. The adjusting fulcrum and the first and second adjusting screws are positioned in a particular positional relationship to prevent any crosstalk from being produced when the base is adjusted in the tangential or radial direction after the base has been adjusted in the radial or tangential direction. When the first and second adjusting screws are turned, the position of the base with respect to the base mount is adjusted about the principal point on the base mount side of an objective lens supported on the base. Therefore, incident and exit angles of the objective lens are equalized to each other through the adjustments.
REFERENCES:
patent: 4978844 (1990-12-01), Ujihara
Nelms David C.
Pioneer Electronic Corporation
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