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A New PCM Audio Disk Pickup Employing a Laser Diode

An improved semiconductor laser pickup for an optical PCM audio disk player is described. In order to raise the servo gain, a reduction in the size and weight of the optical system was tried through the use of a newly designed lens and a revised optical path. A unique simplified two-dimensional servo actuator without any spring for suspension was developed.

JAES Volume 28 Issue 6 pp. 429-432; June 1980
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AES - Audio Engineering Society