Focusing apparatus for use in a system for recovering informatio

Details Focusing apparatus for use in a system for recovering informatio Focusing apparatus for use in a system for recovering informatio

1980-08-11

1983-02-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 45, G11B 1100

Patent

active

043743234

ABSTRACT:
A system for recovering information from a movable information storage medium by scanning with a beam of radiation, the system including a movable lens for focusing the beam of radiation. The movable information storage medium includes a plurality of substantially parallel information tracks containing a pilot signal having a phase angle aligned with the phase angle of the pilot signal recorded on adjacent tracks. The movement of the lens to acquire focus of the beam is controlled such that the lens is retracted until the pilot signal is no longer detected. When detection of the pilot signal ceases, the retraction of the lens also ceases. The lens is subsequently advanced until focus is achieved. Defining the limits of retraction of the lens based on the limits of detection of the pilot signal minimize the range over which the lens must be moved for initial acquisition of focus.

REFERENCES:
patent: 3974327 (1976-08-01), Van Dijk
patent: 4128847 (1978-12-01), Roullet

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