Abstract: A display device for a vehicle includes: a dial plate having an indicator portion corresponding to vehicle information on a viewing side; an image display panel disposed on a back side of the dial plate opposite to the viewing side to luminescently display an image; and a light transmissive display plate that includes a reflective portion disposed on the viewing side of the dial plate to reflect a light from a light source to the viewing side. A region of the dial plate, which faces the image display panel, is set to have a light transmission property to transmit the image of the image display panel through the region of the dial plate.

Abstract: A display device for a vehicle includes: a display unit; a light guide plate disposed on a viewing side of the display unit and having translucency; and a light source unit that causes a light source light to enter inside of the light guide plate through an outer peripheral portion of the light guide plate. The light guide plate includes a reflecting portion having a plurality of reflecting elements to reflect the light source light from the light source unit to the viewing side. The reflecting element has a reflective curved surface formed in a curved surface shape to face the outer peripheral portion where the light source light is incident.

Abstract: A display device for a vehicle includes: a dial plate having an indicator portion corresponding to vehicle information on a viewing side; an image display panel disposed on a back side of the dial plate opposite to the viewing side to luminescently display an image; and a light transmissive display plate that includes a reflective portion disposed on the viewing side of the dial plate to reflect a light from a light source to the viewing side. A region of the dial plate, which faces the image display panel, is set to have a light transmission property to transmit the image of the image display panel through the region of the dial plate.

Abstract: A display device for a vehicle includes: a display unit; a light guide plate disposed on a viewing side of the display unit and having translucency; and a light source unit that causes a light source light to enter inside of the light guide plate through an outer peripheral portion of the light guide plate. The light guide plate includes a reflecting portion having a plurality of reflecting elements to reflect the light source light from the light source unit to the viewing side. The reflecting element has a reflective curved surface formed in a curved surface shape to face the outer peripheral portion where the light source light is incident.

Abstract: An optical pickup emits a light beam onto a recording medium and outputs, in response to a reflection from the medium, a first and a second signal for controlling focusing servo control and tracking servo control, respectively. A signal generating section generates a focus error signal and a tracking error signal in response to the first and second signals, respectively. A driving section is responsive to the output of the signal generating section for outputting a first and a second drive current assigned to focusing and tracking, respectively. An actuator moves the pickup in a focusing direction and a tracking direction by the first and second drive currents, respectively. An adjusting section detects two values close to the maximum and minimum values of the tracking error signal at the start of the focusing servo control and adjusts the gain of the second signal on the basis of a difference between the detected values.

Abstract: An optical pickup emits a light beam onto a recording medium and outputs, in response to a reflection from the medium, a first and a second signal for controlling focusing servo control and tracking servo control, respectively. A signal generating section generates a focus error signal and a tracking error signal in response to the first and second signals, respectively. A driving section is responsive to the output of the signal generating section for outputting a first and a second drive current assigned to focusing and tracking, respectively. An actuator moves the pickup in a focusing direction and a tracking direction by the first and second drive currents, respectively. An adjusting section detects two values close to the maximum and minimum values of the tracking error signal at the start of the focusing servo control and adjusts the gain of the second signal on the basis of a difference between the detected values.

Abstract: An optical disc system is provided with a focusing error signal generator for detecting any focusing error from light reflected by an optical disc and outputting a focusing error signal; a driver for outputting a focusing drive current on the basis of the focusing error signal; and an actuator for shifting an optical pickup in a focusing direction in accordance with the focusing drive signal. The optical disc system also has a signal detection and processing unit for detecting each index point (ID) on the optical disc and generating an index gate signal indicating an address between the index point and another index point next to the first-mentioned index point in the tracking direction; and an inter-ID holder for holding, based on the index gate signal, the focusing error signal at a signal level right before the first-mentioned index point.

Abstract: In an optical head apparatus for recording or reproducing information onto or from an optical disc, a carriage is movable along a guide shaft extending in a direction parallel with the radial direction of the optical disc, and an armature is mounted on the carriage so that it can rotate about a pivotal axis perpendicular to the surface of the optical disc. An objective lens is fixed to the armature and positioned to traverse the tracks on the optical disc when the armature rotates. Guide yokes extend in parallel with the guide shaft. Tracking and carriage-servo coils are fixed to the armature and have a hollow through which the guide yokes loosely extend. A magnetic field means creates magnetic lines of force perpendicular to the longitudinal direction of the guide yokes and parallel with the surface of the optical disc.

Abstract: An optical head for use in an optical disk device holds individually an objective lens, an optical path converting prism and first and second relay lenses that are movably only in the direction of tracking. The objective lens and other members can be moved for the purpose of correcting any possible displacement of a track position of a light beam due to any eccentric arrangement involved and of a focusing position of the light beam due to a change in a relative distance between the lenses and due to surface deflection of a disk. The optical head thus allows easy assembly and adjustment thereof with simplified structure, higher resonance frequency, and high speed response.

Abstract: An external magnetic field generating device includes a pole piece mounted on a face of a magnetic plate, and a coil which is in contact with the face of the magnetic plate, the coil being wound flatly around the pole piece so that it spreads out radially. The coil generates a magnetic field through the pole piece when an electric current passes through the coil, the pole piece is projectable beyond the face of the coil opposite the magnetic plate.