Objective lens drive unit

Details Objective lens drive unit Objective lens drive unit

1993-05-27

1994-04-12

Ben, Loha

Optical: systems and elements

Lens

With support

359824, 369 4416, G02B 702

Patent

active

053030893

ABSTRACT:
In an objective lens drive unit, a magnetic circuit is constructed by two outer yokes, two inner yokes, a magnet and an upper yoke. The magnetic circuit applies a magnetic field to each of electromagnetic coils disposed in a bobbin having an objective lens. The outer yokes and the inner yokes are integrally formed with an actuator base. A through hole is formed in the upper yoke composed of one sheet metal such that a light beam transmitted through the objective lens passes through the through hole. Each of the inner yokes is inserted into the through hole and both end portions of the upper yoke are arranged and fixed to the two outer yokes such that an arranging state of the upper yoke is stabilized. Thus, the upper yoke is simply, reliably and precisely fixed to the inner and outer yokes.

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patent: 5212673 (1993-05-01), Honda
Hirabayashi, Kengo, "Yoke for Optical Filing Pickup", Press Technique, vol. 28, No. 10, pp. 58-59, 1990.

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