Optical pickup

Details Optical pickup Optical pickup

1990-11-09

1992-04-07

Ben, Loha

Optical: systems and elements

Lens

With support

359823, 369 4416, 369256, G02B 702

Patent

active

051033445

ABSTRACT:
An optical pickup, wherein tracking coils are bonded to respective opposite corner parts of two square-tube-shaped focusing coils symmetrically with respect to the optical axis of a lens respectively so that the tracking coil is brought into contact with the two surfaces forming the corner part, at the corner part being apart from a lens holder, and that it is brought into contact with the surface forming the corner part and not being in contact with the lens holder, at the corner part being in contact with the lens holder to eliminate the occurrence of the torque around the axis perpendicular to the tracking direction and the focusing direction and thereby the transmission characteristic in the direction of tracks is improved. One side near to the lens holder of the tracking coil located at the corner part being apart from the lens holder is connected to the lens holder by coating the surface of the focusing coil with a bonding agent of lower hardness than a bonding agent used for bonding between the tracking coil and the focusing coil and between the focusing coil and the lens holder to improve the focusing performance.

REFERENCES:
patent: 4878214 (1989-10-01), Hinotani

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