Optical pickup apparatus of thin type with magnetic circuit

Abstract

In order to provide an optical pickup apparatus having a structure suitable for making thin, compact and light, there is provided a yoke member having two standing plates for forming magnetic poles and a horizontal yoke plate for connecting the standing plates to each other and having a U-shaped cross section, magnets provided on surfaces in the mutually opposing sides of two standing plates, a focus coil formed by being wound in an annular shape and arranged around the standing plate in a movable manner in a height direction and two track coils formed by being wound in an annular shape, in which a size in the direction of the horizontal width of the magnet is set to be equal to or greater than a height in the standing direction of the magnet, and a size in the direction of the horizontal width of the yoke is set to be equal to or greater than a height in the standing direction of the yoke. Accordingly, it is possible to secure a cross sectional area of the magnetic circuit by increasing the size in the direction of the horizontal width of the yoke so as to set the thickness of the optical disc apparatus to be equal to or less than 10 mm.

Dependencies are inferred from the claim text.