Objective-lens actuator

Details Objective-lens actuator Objective-lens actuator

1994-06-07

1996-08-20

Ben, Loha

Optical: systems and elements

Lens

With support

359824, 369 4415, G02B 702

Patent

active

055484492

ABSTRACT:
It is the object of the invention to provide the actuator for the objective lens, suitable for the optical disc apparatus with high speed access property and high drive sensitivity especially in the track drive direction, and to solve problems concerning with manufacturing processes, by using metallic leaf springs with high reliability for supporting the lens holder to make its movements to be translation motions in both focus and tracking drive directions. The lens holder 22, a movable object, is supported by four leaf springs 21a to 21d, thereby its movements is pure translation motions in both focus and tracking drive directions. The drive sensitivity in the track drive direction is largely increased by designing and improving configurations of the magnetic circuit and the focus and tracking drive coils. For tracking drive motion, a pair of tracking drive coils are fixed to two opposite sides of the focus drive coils, and the magnetic circuit contains two plate magnets 15 and two bar magnets 16, such that the arrangement of magnets is line symmetrically with respect to the axis of the objective lens. The lens holder 22 is supported by the actuator base 11 is provided with an air gap 30, the width of which is adjustable by the aid of needle screws 19 and 20 to adjust the inclination of the lens holder 22 in the tracking and tangential directions respectively.

REFERENCES:
patent: 4669823 (1987-06-01), Iguma et al.
patent: 4861138 (1989-08-01), Suzuki
patent: 4998802 (1991-03-01), Kasuga et al.
patent: 5018836 (1991-05-01), Noda et al.
patent: 5161067 (1992-11-01), Tomiyama et al.
patent: 5208703 (1993-05-01), Ikegame et al.

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