Abstract: To provide a linear motion and rotation detector in which a size thereof in a linear motion direction is able to be minimized. A linear motion and rotation detector (7) includes a cylindrical magnetic scale (8) that moves linearly in an axial direction (X) and rotates in a direction around an axis, a first magnetic detection element (41) configured to detect a linear motion position, and a second magnetic detection element (42) configured to detect a rotational position. The magnetic scale (8) includes a lattice-shaped magnetized pattern (37) in which S poles and N poles are alternately arranged in the axial direction (X) and S poles and N poles are alternately magnetized in the direction around the axis on a circumferential surface thereof. The first magnetic detection element (41) and the second magnetic detection element (42) are disposed to face the magnetized pattern (37).

Abstract: A linear motion and rotation detector that detects displacement of an output shaft includes a linear motion position detector including a linear motion scale that includes a linear motion position detection magnetization pattern on a circumferential wall surface facing in a radial direction, and a first magnetic detection element facing the linear motion position detection magnetization pattern from the radial direction and detecting a change in magnetic field, and a rotational position detector including a rotation scale that includes a rotational position detection magnetization pattern on a flat surface facing in an axial direction, and a rotational position detection magnetoresistance element facing the rotational position detection magnetization pattern from the axial direction and detecting a change in magnetic field.

Abstract: Provided is a linear motion and rotation drive apparatus capable of minimizing inertia due to a magnetic scale attached to an output shaft when the output shaft is linearly moved or rotate. A linear motion and rotation drive apparatus (1) includes an output shaft (2), a linear motor (3), a rotational motor (4), a ball spline bearing (5), a magnetic scale (8), a first magnetic detection element (41) configured to detect a linear motion, and a second magnetic detection element (42) configured to detect a rotational motion. The magnetic scale (8) includes a lattice-shaped magnetized pattern (37) in which S poles and N poles are alternately arranged in an axis L direction and S poles and N poles are alternately magnetized in a direction around the axis (L) on a circumferential surface thereof in the direction around an axis (L). The first magnetic detection element (41) and the second magnetic detection element (42) are disposed to face the magnetized pattern (37).

Abstract: To provide a linear motion and rotation detector in which a size thereof in a linear motion direction is able to be minimized. A linear motion and rotation detector (7) includes a cylindrical magnetic scale (8) that moves linearly in an axial direction (X) and rotates in a direction around an axis, a first magnetic detection element (41) configured to detect a linear motion position, and a second magnetic detection element (42) configured to detect a rotational position. The magnetic scale (8) includes a lattice-shaped magnetized pattern (37) in which S poles and N poles are alternately arranged in the axial direction (X) and S poles and N poles are alternately magnetized in the direction around the axis on a circumferential surface thereof. The first magnetic detection element (41) and the second magnetic detection element (42) are disposed to face the magnetized pattern (37).

Abstract: A magnetic sensor device may include “A”-phase magnetic resistance pattern and “B”-phase magnetic resistance pattern which are provided with a phase difference of 90° from each other; wherein the “A” pattern is provided with “+a” phase magnetic resistance pattern and “?a” phase magnetic resistance pattern with a phase difference of 180° from each other for detecting movement of a magnetic scale, and the “B” pattern is provided with “+b” phase magnetic resistance pattern and “?b” phase magnetic resistance pattern with a phase difference of 180° from each other for detecting movement of the magnetic scale, and the “+a” pattern, the “?a” pattern, the “+b” pattern and the “?b” pattern are formed on a same face of one piece of board so that the “+a” pattern and the “?a” pattern are diagonally located and the “+b” pattern and the “?b” pattern are diagonally located.

Abstract: In a magnetic encoder (1), a permanent magnet (20) as a magnetic scale is provided with three rows of tracks (21) wherein N poles and S poles are alternately arranged along a shift direction. In the permanent magnet (20), at end portions (211) in the width direction of the tracks (21A, 21B, 21C), a rotating magnetic field wherein a planar direction changes is formed, and a sensor plane (16) of a magnetic sensor (15) faces a boundary portion (212) between the tracks (21A, 21B, 21C). Thus, detection accuracy of the magnetic encoder of the rotating magnetic field detection type is improved.

Abstract: A magnetic sensor device may include “A”-phase magnetic resistance pattern and “B”-phase magnetic resistance pattern which are provided with a phase difference of 90° from each other; wherein the “A” pattern is provided with “+a” phase magnetic resistance pattern and “?a” phase magnetic resistance pattern with a phase difference of 180° from each other for detecting movement of a magnetic scale, and the “B” pattern is provided with “+b” phase magnetic resistance pattern and “?b” phase magnetic resistance pattern with a phase difference of 180° from each other for detecting movement of the magnetic scale, and the “+a” pattern, the “?a” pattern, the “+b” pattern and the “?b” pattern are formed on a same face of one piece of board so that the “+a” pattern and the “?a” pattern are diagonally located and the “+b” pattern and the “?b” pattern are diagonally located.

Abstract: A manufacturing method for an optical head device includes integrating at least a plurality of light sources and a plurality of diffraction elements with each other as an optical module, adjusting a relative positional relationship of the plurality of diffraction elements each other on the optical module, and then adjusting spot positions of the sub-beams on the optical recording medium by adjusting the entire optical module on the device frame. After that, the optical module is fixed on the device frame.

Abstract: A manufacturing method for an optical head device includes integrating at least a plurality of light sources and a plurality of diffraction elements with each other as an optical module, adjusting a relative positional relationship of the plurality of diffraction elements each other on the optical module, and then adjusting spot positions of the sub-beams on the optical recording medium by adjusting the entire optical module on the device frame. After that, the optical module is fixed on the device frame.

Abstract: An optical head apparatus includes a wiring substrate and an apparatus frame that is made of a resin or another damper material. Optical components that form an optical system are mounted on the wiring substrate. On the other hand, components such as wire suspensions and yoke plate of an object lens driving mechanism, which is a source of vibration, are mounted on the apparatus frame. The apparatus frame is attached to the surface of the wiring substrate. Vibration that may be generated in the object lens driving mechanism is absorbed by the apparatus frame having a damper function, and therefore do not transfer to the optical components mounted on the wiring substrate.

Abstract: In accordance with the invention, an optical head device comprises a light source, a light receiving element, an optical system that guides light emitted by the light source to an optical recording medium and also guides the light reflected from the optical recording medium to the light receiving element and a base on which the light source, the light receiving element and optical elements constituting the optical system are mounted. An element holder composed of a photosensitive glass is mounted on the base. The element holder has a positioning portion(s) therein for at least one of the optical elements. The base has openings therein at locations through which the optical elements can be assessed from the back thereof.

Abstract: A light source device for an optical head apparatus comprises at least one laser diode chip and a semiconductor substrate integral with the laser chip. The light source device is formed in a recess of the semiconductor substrate for aligning the laser diode chip on a surface of the semiconductor substrate by a semiconductor processing technique. The recess comprises a first side surface for defining a laser beam emitted from the laser diode chip in an optical axial direction and a second side surface for defining a direction perpendicular to the optical axial direction.

Abstract: A flat plate section 2a and a protruded section 2b are formed in a metallic radiator plate 2, a first semiconductor substrate 4 with a light receptor 3 mounted thereon is disposed on the flat plate section 2a of the metallic radiator plate 2, and a second semiconductor substrate 7 with a laser diode 5 and a monitoring light receptor 6 mounted thereon is disposed on the protruded section 2b of the metallic radiator plate 2.

Abstract: In an optical pickup apparatus, a light source, a photo device and optical elements, constructing an optical system for converging a light emitted by the light source on an optical recording medium and guiding a returning light reflected by the optical recording medium to the photo device, are mounted on a frame which is composed of a wiring board having wiring patterns, including circuits of electric supply to the light source and the photo device.