Abstract: To minimize the amount of air that may enter the damper chamber in a normally closed solenoid valve to stably maintain the damper capacity, the normally closed solenoid valve has a valve housing and a movable element. A cylinder having an open end is formed in one of the valve housing and the movable element. The cylinder has an inner diameter smaller than the outer diameter of a trunk of the movable element. A piston provided on the other of the valve chamber and the movable element is movable relative to the cylinder as the movable member moves. The piston is inserted into the cylinder through its open end to define a damper chamber between the piston and the cylinder. A restricted passage is formed between the damper chamber and the valve chamber through which hydraulic fluid can be moved between the valve chamber and the damper chamber.

Abstract: To minimize the amount of air that may enter the damper chamber in a normally closed solenoid valve to stably maintain the damper capacity, the normally closed solenoid valve has a valve housing and a movable element. A cylinder having an open end is formed in one of the valve housing and the movable element. The cylinder has an inner diameter smaller than the outer diameter of a trunk of the movable element. A piston provided on the other of the valve chamber and the movable element is movable relative to the cylinder as the movable member moves. The piston is inserted into the cylinder through its open end to define a damper chamber between the piston and the cylinder. A restricted passage is formed between the damper chamber and the valve chamber through which hydraulic fluid can be moved between the valve chamber and the damper chamber.

Abstract: An objective lens device includes: a first objective lens having a first numerical aperture, which can condense light into a disc-shaped first optical recording medium including a first cover layer of first thickness; a second objective lens having a second numerical aperture which is smaller than the first numerical aperture, which can condense light into a disc-shaped second optical recording medium including a second cover layer of second thickness which is thicker than the first thickness; a third objective lens having a third numerical aperture which is smaller than the second numerical aperture, which can condense light into a disc-shaped third optical recording medium including a third cover layer of third thickness which is thicker than the second thickness; and a lens holder configured to integrally hold the first, second, and third objective lenses.

Abstract: An optical pick-up adapted to have ability to conduct a control so as to tilt a lens holder (2), including a supporting block (3) for movably supporting the lens holder in the focus direction and in the tracking direction, a supporting member (4) including a pair of leg pieces (41), (41) for supporting and allowing the supporting block to be tilted by fixing front end sides of these leg pieces onto a base (16), the leg pieces being arranged such that spacing between the leg pieces increases as a distance from a side at which the supporting block is supported increases toward the front end side, and a drive mechanism (5) for applying a drive force to the supporting block so as to tilt the supporting block by changing a shape of the pair of leg pieces, whereby tilting the lens holder which is supported by the supporting block.

Abstract: An objective lens device includes: a first objective lens having a first numerical aperture, which can condense light into a disc-shaped first optical recording medium including a first cover layer of first thickness; a second objective lens having a second numerical aperture which is smaller than the first numerical aperture, which can condense light into a disc-shaped second optical recording medium including a second cover layer of second thickness which is thicker than the first thickness; a third objective lens having a third numerical aperture which is smaller than the second numerical aperture, which can condense light into a disc-shaped third optical recording medium including a third cover layer of third thickness which is thicker than the second thickness; and a lens holder configured to integrally hold the first, second, and third objective lenses.

Abstract: An optical pickup device includes a lens holder having an objective lens focusing a light beam onto a signal recording surface of a rotated optical disc and being movable in a focusing direction in parallel with the optical axis of the objective lens and in a tracking direction perpendicular to the optical axis of the objective lens; a support body supporting the lens holder movably in the focusing direction and the tracking direction; and an elastic support member supporting the support body to a base and including a pair of support legs that are inclined to expand the space between the support legs from one ends supporting the support body toward the other and include a plurality of support pieces formed from the one ends toward the other. The support pieces are formed by forming roughly circular, roughly elliptic, or roughly rectangular cut-outs on the support legs.

Abstract: The present invention is directed to an optical pick-up adapted for moving an object lens (7) supported by a lens holder (2) in a focus direction in parallel to the optical axis direction thereof and in a tracking direction perpendicular to the focus direction, and for performing control of tilt angle serving to tilt the optical axis of the object lens following inclination of an optical disc. At the lens holder, there are provided a pair of focus coils (20) and a pair of tracking coils (30).

Abstract: The present invention is directed to an optical pick-up adapted for moving an object lens (7) supported by a lens holder (2) in a focus direction in parallel to the optical axis direction thereof and in a tracking direction perpendicular to the focus direction, and for performing control of tilt angle serving to tilt the optical axis of the object lens following inclination of an optical disc. At the lens holder, there are provided a pair of focus coils (20) and a pair of tracking coils (30).

Abstract: A lens holder portion 3 for holding an objective lens 5 is supported on an end side of each of four suspension wires 2 so that it is capable of moving in a focusing direction and in a tracking direction. Minute uneven faces 2a are formed in the surface of each suspension wire 2. Adhesive agent 11 which fixes each suspension wire 2 on the lens holder 3 and fixing member 4 invades into dented portions in this uneven face 2a and hardens, thereby producing an anchor effect to improve bonding strength. Consequently, in an objective lens drive unit 1 in which the lens holder 3 is supported by a plurality of suspension wires 2, bonding strength to the suspension wire 2 can be improved.

Abstract: The present invention is directed to an optical pick-up adapted to have ability to conduct a control so as to tilt a lens holder (2) to which an object lens (7) is attached so that the optical axis of the object lens is perpendicular to the signal recording surface of an optical disc, which comprises the lens holder to which the object lens is attached and to be moved in a focus direction in parallel to an optical axis of the object lens and in a tracking direction perpendicular to the optical axis direction of the object lens, a supporting block (3) for movably supporting the lens holder in the focus direction and in the tracking direction, a supporting member (4) including a pair of leg pieces (41), (41) for supporting and allowing the supporting block to be tilted by fixing front end sides of these leg pieces onto a base (16), the leg pieces being arranged such that spacing between the leg pieces increases as a distance from a side at which the supporting block is supported increases toward the front end s

Abstract: A lens holder portion 3 for holding an objective lens 5 is supported on an end side of each of four suspension wires 2 so that it is capable of moving in a focusing direction and in a tracking direction. Minute uneven faces 2a are formed in the surface of each suspension wire 2. Adhesive agent 11 which fixes each suspension wire 2 on the lens holder 3 and fixing member 4 invades into dented portions in this uneven face 2a and hardens, thereby producing an anchor effect to improve bonding strength. Consequently, in an objective lens drive unit 1 in which the lens holder 3 is supported by a plurality of suspension wires 2, bonding strength to the suspension wire 2 can be improved.

Abstract: There is provided an objective lens driving device, wherein a lens holder for holding an objective lens and a coil unit is connected with and floatingly supported by a base block using a plurality of elongate flexible metal members. The objective lens driving device is formed by positioning a plurality of elongate flexible metal members at the predetermined positions with respect to the lens holder and the base block which are to be formed, forming the lens holder integrally connected with one end of each elongate flexible metal member, forming the base block integrally connected with the other end of each elongate flexible metal member, attaching the objective lens and the coil unit in the lens holder.

Abstract: An optical pickup magneto-optically records information on a magneto optical disc in cooperation with a magnetic head. The optical pickup is disposed at one surface side of the magneto optical disc while the magnetic head is disposed at the other surface side of the magneto optical disc during a recording operation of the magneto optical disc. The optical pickup is provided with: a light emission device for emitting a light beam; an optical system for guiding the emitted light beam; an objective lens for converging and focusing the guided light beam onto the optical disc; and an actuator holding the objective lens and having a magnetic circuit for actuating the objective lens to move in focusing and tracking directions respectively of the magneto optical disc by a magnetic force generated by the magnetic circuit.

Abstract: An optical pickup device includes an objective lens assembly including an objective lens facing a surface of an optical disk, an actuator base supporting the objective lens to be movable, and a body in which an optical element is accommodated, the actuator base being supported by the body to be slidable. The actuator base is provided with a first flat portion positioned in a vicinity of the optical disk surface and a second flat portion apart from the optical disk surface, the first and second flat portions being formed with first and second protruded pieces having spherical end surfaces, and the body is formed with first and second receiving portions against which the first and second protruded pieces abut, respectively. The optical body is composed of a first supporting portion for supporting the first flat portion, a second supporting portion for supporting the second flat portion and an intermediate portion disposed below the first flat portion.

Abstract: A cartridge of write and read type or a cartridge of read only type is selectively loaded to a recording and reproducing apparatus. The recording and reproducing apparatus is provided with: a magnetic head for applying a magnetic field; a head movement device for moving the magnetic head between a near position and a far position; a switching lever, which is movable between a non-regulating position to allow the magnetic head to move between the near position and the far position, and a regulating position to regulate the position of the magnetic head at the far position; and a slide plate disposed movably on a cartridge holder and having a protruded portion which is opposed to the cartridge stored in the cartridge holder. The protruded portion abuts to the loaded cartridge to move the slide plate, and the switching lever is positioned at the non-regulating position by abutting to the moved slide plate if the loaded cartridge is the write and read type.