Abstract: An optical pickup of an optical disc apparatus has a lens holder for holding an objective lens is pivoted with a guide shaft slidably in a direction in parallel with an optical axis of the objective lens and rotatably around the guide shaft in a direction perpendicular to the optical axis. For focusing a laser beam on a data recording face of an optical disc in a focusing on operation, a wobble signal of rectangular waveform having a predetermined voltage and a predetermined frequency is applied to a tracking coil for reciprocally displacing the lens holder in the direction perpendicular to the optical axis, while a focusing coil is driven for moving the lens holder in the direction in parallel with the optical axis. Thus, the lens holder can be moved smoothly along the guide shaft, so that the possibility of failure of the focusing the laser beam on the optical disc can be reduced drastically.

Abstract: An optical pickup in which a plate 2 provided with a photodiode 22 is bonded to an optical bench 1 through an adhesive agent layer 3 in a state in which a minute gap &agr; is maintained between the plate 2 and the optical bench 1. Circular through holes 27 are formed in advance at a plurality of portions of the plate 2. The adhesive agent layer 3 is formed as an adhesive agent injected into the through holes 27 at the plurality of portions is forced out downward through the through holes 27 and is cured in the state of having reached an upper surface 12 of the optical bench 1. The amount of the adhesive agent injected with respect to each of the through holes is controlled so as to be fixed.

Abstract: In an optical pickup device, an upper plate portion, leg portions and a support shaft are provided in a base member so as to be disposed above a lens holder. A mechanism for adjusting the tilt angle of an objective lens is constituted by lower end surfaces formed out the curved surfaces of the leg portions, and reception surfaces formed out of the valley-like surfaces of an optical chassis. An electromagnetic drive mechanism for the lens holder includes the leg portions, magnets, and coils of the lens holder.

Abstract: In an optical pickup device, an upper plate portion, leg portions and a support shaft are provided in a base member so as to be disposed above a lens holder. A mechanism for adjusting the tilt angle of an objective lens is constituted by lower end surfaces formed out the curved surfaces of the leg portions, and reception surfaces formed out of the valley-like surfaces of an optical chassis. An electromagnetic drive mechanism for the lens holder includes the leg portions, magnets, and coils of the lens holder.

Abstract: An objective lens has an actuator base and a lens holder for supporting an objective lens. The lens holder has a shaft hole. A shaft is disposed on the actuator base and fitted to the shaft hole. A cover is attached to the actuator base so as to cover the lens holder in a manner that the cover comes into contact with or comes close to the top face of the shaft. Protrusions are disposed on an actuator base opposing face and a cover opposing face of the lens holder without contacting the shaft. When the protrusions are contacted with the actuator base and the cover, a predetermined gap is formed between the lens holder and the actuator base and between the lens holder and the cover, the gap is communicated with a space in the cover through the side of the protrusions.