Patent ID: 7940610

Claim:
An optical head comprising: a base; an act base, fixed to the base; a support member, fixed to the act base; a lens holder, holding an objective lens; a linear wire spring, fixed to the support member, and elastically supporting the lens holder; a flexible substrate, attached to the support member, wherein the act base has a bottom portion having a flat shape and having an opening portion that is a through hole, the flexible substrate includes an electric wiring for supplying an electric power and has: a main body portion; a turning portion which is connected to the main body portion and is bendable relative to the main body portion; and a land which is provided with the turning portion, is exposed outside and is soldered to the wire spring, the support member is fixed so as to close the opening portion and includes: a substrate attaching portion which is formed at a surface opposite to a surface facing the lens holder and on which the main body portion of the flexible substrate is arranged; an adhesive portion which is formed at a surface adjacent to the substrate attaching portion and which adheres with the turning portion of the flexible substrate; and an adhesive recessed groove which is formed on the adhesive portion so as to extend from a surface held in contact with the act base to an opposite surface and in which a thermosetting adhesive agent for adhering the turning portion of the flexible substrate is injected, the lens holder includes: a focus coil which allows the lens holder to come close to or separate from a disk surface of an optical disk; a tracking coil which allows the lens holder to move in a direction parallel to the disk surface; a tilt coil which allows the lens holder to follow an inclination of the disk surface; and a wire attaching portion which is electrically connected to the focus coil, the tracking coil and the tilt coil and to which the wire spring is attached by soldering, an electric power is supplied independently to the focus coil, the tracking coil and the tilt coil through the wire spring from the land, and the adhesive recessed groove is formed in an elongated space having an end portion opened by arranging the turning portion of the flexible substrate, and an end portion held in contact with the act base has an adhesive agent relief portion that has a recessed groove shape deeper than the adhesive recessed groove so as to be connected to the opening portion.