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: In an optical head (10) used for an optical disc (30) in which light-transmitting layers largely change in thickness, a degree-of-diversion/convergence enlarging member (20) fixed between a collimating lens (4) and an objective lens (6) is arranged. With this configuration, a moving range of the collimating lens can be reduced, and the optical head can be miniaturized.

Abstract: An optical head device is provided with a light source 1 for emitting a plurality of lights having different wavelengths, an objective lens 31 for focusing a light spot on an optical disc 21, an objective lens 32 for focusing light spots on optical discs 22 to 24, and a prism 53 for splitting a laser light having a wavelength of 405 nm from the light source 1 into a transmitting light and a reflected light, introducing the reflected light to the objective lens 31 and the transmitting light to the objective lens 32, and introducing laser lights having wavelengths of 660 nm, 780 nm from the light source 1 to the objective lens 32.

Abstract: An optical disk device of the present application includes: a turntable 30 including plural induction grooves 31a to 31h as concave portions radially extending from vicinity of a center of the turntable 30 and having open portions in an outer periphery of the turntable 30 and plural through-holes 32a to 32h penetrating bottom faces 33a to 33h on the vicinity of the center side of the plural induction grooves 31a to 31h and a top face of the turntable 30; and an outer rotor type spindle motor 35 provided with plural fins 36a to 36h as convex portions on a rotor on a side face thereof. The optical disk device of the present application utilizes an airflow generated by rotation of the rotor of the spindle motor 35 and the turntable 30 in conjunction therewith as a dust removing wind for removing dust attaching to an objective lens side area.

Abstract: An optical pickup device 11 according to the present invention includes: a light source 1 that emits a light beam; a condensing element 5 for condensing the light beam toward an information storage medium 14; and a protruding member 101, which comes closer to the information storage medium 14 than the condensing element 5 does when the condensing element 5 faces the information storage medium 14. The protruding member 101 is shaped so as to gradually protrude toward the information storage medium 14 in a tangential direction 21 of the information storage medium 14 rotating.

Abstract: An optical recording medium improves the quality of servo signals and readout signals by preventing light convergence on the back of the surface of the optical recording medium and reducing interference of light reflected from recording surfaces of the optical recording medium. An optical recording medium 40 includes at least three information recording surfaces, and satisfies d1<(d4?d1), where d1 is a distance from a surface 40z of the optical recording medium 40 to a first information recording surface 40a that is nearest to the surface 40z and d4 is a distance from the surface 40z to a fourth information recording surface 40d that is most distant from the surface 40z, and satisfies dmin?8 ?m, where dmin is a minimum interlayer thickness between the at least three information recording surfaces.

Abstract: In an optical head for performing the reproduction or recording of information for two or more types of different optical disks, the damage caused to an optical disk or an objective lens by collision between the optical disk and the objective lens is avoided. An optical heads device for reproducing or recording two or more types of information recording mediums different from each other comprises a first optical system, a second optical system, and a control unit for avoiding the collision between an optical disk and a second objective lens when a first optical system is in operation.

Abstract: A first information recorder comprises a limited number-of-times of copying information setting unit for setting information on the limited number-of-times of copying electronic data, a first limited number-of-times of copying information updating unit for reading out the electronic data from a first information recording medium containing electronic data set with limited number of times of copying information by the limited number-of-times of copying information setting unit and updating the limited number-of-times of copying information set with respect to the electronic data, and a first transmitter for transmitting electronic data whose limited number-of-times of copying information is updated by the first limited number of times of copying information updating unit.

Abstract: There is provided a tilt correction processing method which can reliably detect the amount of tilt in a short time and adjust it, and then recording or replaying is started in a short time by employing the same.

Abstract: An optical head device is provided with a semiconductor laser, an aberration correcting element for transmitting a beam from the semiconductor laser, a light guiding portion for introducing the beam from the semiconductor laser to the aberration correcting element, and an objective lens for focusing the beam having passed through the aberration correcting element on an optical disc. The aberration correcting element corrects a longitudinal chromatic aberration occurring in the objective lens and a longitudinal chromatic aberration occurring in the light guiding portion excluding the objective lens and the aberration correcting element based on a longitudinal chromatic aberration occurring in the aberration correcting element when the semiconductor laser emits a beam having a wavelength different by a specified wavelength difference.

Abstract: The present invention aims to generate an offset-free tracking signal and to realize a stable tracking control even if an optical disc is a multi-layer disc having three or more layers. Light receiving portions of a main region light receiving portion group is arranged between a projection line of a third dividing line on a photodetector and a projection line of a fourth dividing line on the photodetector by stray lights from information layers adjacent to the one, on which a light beam is focused, out of a plurality of information layers. Further, light receiving portions of a subregion light receiving portion group is arranged between a projection line of a first dividing line on a photodetector and a projection line of a second dividing line on the photodetector by the stray lights from the information layers adjacent to the one, on which a light beam is focused, out of the plurality of information layers.

Abstract: An optical head device 100 of the invention performs at least one of recording and reproducing of information for a plurality of types of optical recording mediums 7. A light source 1 emits a plurality of kinds of light having mutually different wavelengths. The positions for emitting the plurality of kinds of light from the light source are mutually deviated. A center C1 of first light 2a is matched with a pattern center C3 of a first diffracting plane 3a. A center C2 of second light 2b is matched with a pattern center C4 of a second diffracting plane 3b. The optical head apparatus 100 provided with the light source in which two or more light emitting elements are mounted in one module can perform stable tracking control.

Abstract: An optical-disk drive device is provided which is capable of executing recording or reproduction at a plurality of numerical apertures and keeping constant the quantity of light which is emitted by a light-emitting element.

Abstract: A housing 25 of a stepping motor 1 consists of a pair of case sections 27 arranged in front and rear in the direction of an axial line L of a rotating shaft 3. The case sections 27 are formed of: an end plate 27a to which a bearing 31 for supporting the rotating shaft 3 is fixed, and a base plate 27b and a top plate 27c extending from the end plate 27a in the direction of axial line L of the rotating shaft 3. The case sections 27 are formed by bending a single plate material.

Abstract: A first information recorder comprises a limited number-of-times of copying information setting unit for setting information on the limited number-of-times of copying electronic data, a first limited number-of-times of copying information updating unit for reading out the electronic data from a first information recording medium containing electronic data set with limited number of times of copying information by the limited number-of-times of copying information setting unit and updating the limited number-of-times of copying information set with respect to the electronic data, and a first transmitter for transmitting electronic data whose limited number-of-times of copying information is updated by the first limited number of times of copying information updating unit.

Abstract: An integrated unit in which a light source and a light emitting diode are combined into one component is fixed to an optical bench. Then, relative position adjustment of an objective lens actuator is carried out with respect to the optical bench so that a desired detection signal can be obtained through reflected light from a disk information recording medium and then the objective lens actuator is fixed. The relative position adjustment of the integrated unit is no longer required and it is no longer necessary preliminarily to provide a margin for adjusting the integrated unit. Thus, an optical head can be reduced in size and thickness.

Abstract: An optical head includes the following: a light beam separator (35) that includes substantial interference regions for light that is reflected from an information recording medium and travels in a straight path and ±first-order diffracted light produced by information tracks of the information recording medium, and diffracts each of plural light beams in regions (32a, 32b) of the substantial interference regions, where the amount of light is changed by a change in the relative angle between the information recording medium and the objective lens and by a shift of the objective lens in the radial direction of the information recording medium; a light-receiving element (36a, 36b) for receiving the light beam that is reflected by the information recording medium and separated by the light beam separator (35); and an arithmetic circuit that corrects a value of an electrical signal detected by the light-receiving element (36a, 36b) in accordance with a radial position signal corresponding to the amount of shift of

Abstract: Fifth order spherical aberration in addition to third order spherical aberration for an optical information recording medium of which thickness of a light transmission layer changes greatly is corrected. An objective lens collects a laser beam emitted from a semiconductor laser on an optical information recording medium. A spherical aberration correcting portion corrects spherical aberration generated according to a thickness of the light transmission layer of the optical information recording medium, in which the spherical aberration correcting portion includes a collimator lens, a lens holder and a stepping motor for correcting the third order spherical aberration and a liquid crystal element and an applied voltage control portion for correcting the fifth order spherical aberration.

Abstract: [Problem]To provide an optical head having a satisfactory shock resistance and capable of holding an aberration correction lens without consuming power and achieving accurate positioning. [Means for Resolution] An aberration correction lens 4 is disposed in a space between a laser light source 3 and an objective lens 5, and a lens holder 10 is frictionally coupled to a drive shaft 7 via a frictional holding body 8. A piezoelectric element 6 is provided to one end of the drive shaft 7. The piezoelectric element 6 extends and contracts in response to an applied voltage. The lens holder 10 is moved relatively with respect to the drive shaft 7 in the drive shaft direction by varying a change rate when the applied voltage to the piezoelectric element 6 is increased and decreased.

Abstract: An integrated unit in which a light source and a light emitting diode are combined into one component is fixed to an optical bench. Then, relative position adjustment of an objective lens actuator is carried out with respect to the optical bench so that a desired detection signal can be obtained through reflected light from a disk information recording medium and then the objective lens actuator is fixed. The relative position adjustment of the integrated unit is no longer required and it is no longer necessary preliminarily to provide a margin for adjusting the integrated unit. Thus, an optical head can be reduced in size and thickness.