Acquiring focus in an optical system using a soft focus acquirin

Details Acquiring focus in an optical system using a soft focus acquirin Acquiring focus in an optical system using a soft focus acquirin

1990-06-04

1992-07-07

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

2502015, G11B 7085

Patent

active

051289130

ABSTRACT:
The focus acquisition system on optical disk recorder as well as other optical systems, uses repeated pulse position pulses with interlead coasting of an objective lens for providing a soft focus acquire. The pulse energization of the lens to move toward an in-focus condition overcomes stiction and friction. While the coasting allows the energy level applied to the lens movement to be minimal, i.e. soft, the purpose of the interdirectional pulse control actuation is to overcome friction without requiring large power to the lens which can cause an overshoot of the lens at the in-focus position. Compensation techniques and stopping the lens at the in-focus position are also shown.

REFERENCES:
patent: 4544837 (1985-10-01), Tanaka et al.
patent: 4703466 (1987-10-01), Konno
patent: 4733066 (1988-03-01), Konno et al.
patent: 5010538 (1991-04-01), Takeda et al.
patent: 5020045 (1991-05-01), Smart et al.

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