Abstract: As imaging devices are miniaturized, and optical devices are miniaturized, lens moving mechanisms are also miniaturized. Thus, position sensors for them are required to be miniaturized and have high accuracy at low cost. A magnet of a pillar shape and a yoke which move in the X axis direction with respect to a magnetic field detection element are provided, and a shape of a cross section of the yoke which is orthogonal to a longitudinal direction of the magnet changes along the longitudinal direction.

Abstract: An optical apparatus according to the present invention comprises an optical base having a bonding surface, and an optical component fixedly bonded to the bonding surface with an adhesive. The optical base has an open hole formed in the bonding surface. The open hole is filled with the adhesive. The optical component contacts the open hole so that a part of the open hole is left unclosed.

Abstract: As imaging devices are miniaturized, and optical devices are miniaturized, lens moving mechanisms are also miniaturized. Thus, position sensors for them are required to be miniaturized and have high accuracy at low cost. A magnet 2 of a pillar shape and a yoke 3 which move in X axis direction with respect to a magnetic field detection element 1 are provided, and a shape of a cross section of the yoke 3 which is orthogonal to a longitudinal direction of the magnet 2 changes along the longitudinal direction.

Abstract: A semiconductor laser device according to the present invention includes a mechanism section having a semiconductor laser, a first frame for holding the mechanism section and radiating heat generated in the mechanism section, a control section for controlling the mechanism section, a second frame for holding the control section and radiating heat generated in the control section, and a coupling section for insulatively coupling the first frame to the second frame.

Abstract: An optical disc apparatus is provided, which comprising a laser light emitting portion for generating laser light for irradiating an optical disc, and a laser control portion for controlling a light emission operation of the laser light emitting portion. The laser control portion causes the laser light emitting portion to emit light with a first period during a first operation, and the laser control portion causes the laser light emitting portion to emit light with a second period during a second operation. The first period and the second period are different from each other.

Abstract: A semiconductor laser device according to the present invention includes a mechanism section having a semiconductor laser, a first frame for holding the mechanism section and radiating heat generated in the mechanism section, a control section for controlling the mechanism section, a second frame for holding the control section and radiating heat generated in the control section, and a coupling section for insulatively coupling the first frame to the second frame.

Abstract: The disc cartridge according to the present invention comprise: a cartridge body including a disc housing section for housing a disc so as to be rotatable, which is provided with an opening for exposing a part of the disc; a shutter member which is movable to open or close the opening; a shutter driving spring for applying a force to the shutter member not to open the opening in a closing state in which the shutter member closes the opening; and a locking portion for locking the shutter member.

Abstract: An optical disc apparatus is provided, which comprising a laser light emitting portion for generating laser light for irradiating an optical disc, and a laser control portion for controlling a light emission operation of the laser light emitting portion. The laser control portion causes the laser light emitting portion to emit light with a first period during a first operation, and the laser control portion causes the laser light emitting portion to emit light with a second period during a second operation. The first period and the second period are different from each other.