Abstract: In a hologram device, a reflecting mirror is provided on a light path of reproduction light, the reproduction light is oriented in a direction parallel to an optical recording medium, and, then, a light-receiving member receives the light. Since the light-receiving member need not be provided in a thickness direction, even if a light path length is increased, the hologram device can be made thin. In addition, by using the reflecting mirror having a very small area, it is possible to restrict crosstalk even without a pinhole. Further, a light-receiving device is accommodated in a housing, and the reproduction light is incident upon the interior of the housing through a transparent cover, so that it is possible to prevent entry of dust.

Abstract: When currents are applied to driving coils, electromagnetic forces are generated between the currents and magnetic fluxes passing through gaps, a shaft member is swung in one direction, and a tilt angle of a mirror (controlled object) changes relative to a support center point. Electromotive forces generated in detection coils when the magnetic fluxes pass through the detection coils are given as feedback signals to a control unit. The control unit generates currents on the basis of the feedback signals, and applies the currents to the driving coils. By detecting the velocity of the mirror during swinging with the detection coils, the structure of the actuator can be simplified. Further, the responsivity can be increased, and the tilt angle of the mirror can be detected with high accuracy.

Abstract: An actuator in which, when a supporting shaft, where a mirror (control object) is provided, is tilted by receiving an electromagnetic force of a magnetic driving mechanism, small balls of a supporting mechanism move in an axial direction in a space provided between an outer base and an inner ring member. Therefore, the supporting shaft and the inner ring member holding the supporting shaft swing. At this time, since the inner ring member swings around a rotational fulcrum as center, the supporting shaft can swing around one rotational fulcrum as center at all times. A plurality of laid members serving as a rotation restricting member prevent rotation of the supporting shaft in a direction around the axis.

Abstract: [Object] To provide a recording medium that is strong in deformation, easy to handle, excellent in portability, and inexpensive, and a recording-medium driving device thereof. [Solving Means] When an end of a recording medium 10A inserted in an insertion hole 22 of the mounting portion 20, is screwed, a recording surface of the recording medium 10A (an outer peripheral surface of an outer cylindrical member 11) opposing a pickup 30A is moved in a peripheral direction. Therefore, data recorded on the recording medium 10A can be read out by the pickup 30A. The pickup 30 is only secured to a position opposing the recording surface of the recording medium 10, so that means for moving the pickup is not required. Therefore, an inexpensive recording-medium driving device having a simple structure can be provided.

Abstract: [Object] To provide a hologram information recording medium and a hologram information recording/reproducing device capable of accurately reproducing data multiplexed on the recording medium irrespective of the influence of the external environment and so forth. [Solving Means] In one recording area 31 of a recording medium 3, a plurality of the same information groups are recorded in substantially the same area with varied multi-parameters, in consideration of the expansion and the contraction of the recording medium 3. That is, a plurality of data groups A to D are recorded in the one recording area 31 of the recording medium 3, with a laser wavelength ? varied. Specifically, the data groups A to D are recorded in one recording area as three groups: a data group G1 including data A1, data B1, data C1, and data D1; a data group G2 including data A2, data B2, data C2, and data D2; and a data group G3 including data A3, data B3, data C3, and data D3.

Abstract: A first virtual axis orthogonally intersects with a second virtual axis, and a third axis (axis passing a support center point) vertical to the first and second virtual axes is permitted to be a reference axis. A magnetic drive mechanism is provided with first magnetic drive sections for applying a drive power to a movable axis, which is supporting an object to be controlled, in a rotating direction of the first virtual axis or in a rotating direction parallel to the first virtual axis, and second magnetic drive sections for applying a drive power to the movable axis, in a rotating direction of the second virtual axis or in a rotating direction parallel to the second virtual axis.

Abstract: A hologram information reproducing device is described which can reproduce information from a recording medium on which hologram information is recorded, and which can be downsized. In one aspect, when light from a light source is emitted, the light is converted into parallel reference light, by a lens of an optical system. A mirror changes the orientation of the reference light so that it is oriented obliquely downward towards a recording medium. More specifically, as viewed from the top, the mirror changes a path of the light from the light source unit by approximately 90 degrees. In addition, as viewed from the side, the mirror changes the path of the light from the light source unit downward by approximately 45 degrees. Since an interference pattern recorded on the recording medium is a Bragg grating, when the reference light illuminates a recording area of the recording medium, a reproduction light is obtained by Bragg diffraction.

Abstract: A holographic recording medium having a recording layer on which holograms are formed by interference between an object beam and a reference beam to thereby record information. The recording layer is formed with a plurality of hologram groups each composed of a plurality of holograms. The holograms in each of the hologram groups have the same information, and adjacent holograms partially overlap each other. In addition, the holograms are arranged to be spaced apart from holograms in other hologram groups.

Abstract: A hologram reproducing head that reproduces information recorded as a hologram (11) on a recording medium (10) includes a light source (3) that emits a reference beam (21) for reproducing the hologram (11) and a light receiver (4) that receives reproduced light (22) from the hologram (11), both of which are disposed on one substrate (2), and a transparent plate (5) opposed to the substrate (2) to transmit emitting beam (20) from the light source (3) and the reproduced light (22). The transparent plate (5) includes an optical path changing hologram (5a) located at a position opposed to the light source (3) in order to diffract the reference beam (21) and then introduce it into the hologram (11). A pinhole filter (6a) is provided on the surface of the transparent plate (5) at a position where the reproduced light (22) from the hologram (11) is transmitted.

Abstract: A high-precision positioning apparatus includes a fine driving unit for producing horizontal and small movements of a flat recording medium relative to an optical system, the medium being used for optically recording and reproducing information. The fine driving unit includes a frame-shaped unit body, a first driving frame inside the unit body, and a second driving frame inside the first driving frame and secured at a position adjacent to a magnetized portion of the recording medium. The first driving frame is movable relative to the unit body by fine driving devices in the horizontal direction of the recording medium, while the second driving frame is movable relative to the first driving frame by other fine driving devices in the horizontal direction of the recording medium and in the direction substantially orthogonal to the moving direction of the first driving frame, thereby producing horizontal and small movements of the recording medium.

Abstract: There is disclosed a high precision positioning apparatus capable of realizing accurate positioning of a recording medium with respect to an optical system by minute movement at a relatively low cost. The high precision positioning apparatus comprises a driving unit 1 for minutely moving a flat-plate shaped recording medium 10, which records/reproduces information using light, with respect to an optical system in an in-plane direction of the recording medium 10. The driving unit 1 comprises a frame-shaped unit body 2, a first drive frame 3 accommodated inside the unit body 2, and a second drive frame 4 accommodated inside the first drive frame 3 and fixed in the vicinity of a recording portion 11 of the recording medium 10.

Abstract: A hologram apparatus that can reproduce, with a simple configuration, information in a hologram recorded by wavelength multiplexing is provided. In a hologram apparatus, light from a light source 10 enters a hologram 2a provided on a recording medium 2, and light exiting from the hologram 2a is received by a light receiver 3. The light emitted from the light source 10 includes light intensity peaks corresponding to a plurality of wavelengths. A variable filter 12 for switching the wavelength of light to be transmitted therethrough is provided between the light source 10 and the recording medium 2. The variable filter 12 is connected to a driver 13 that changes the characteristic of the variable filter 12 so as to transmit a light component in a wavelength band including one of the light intensity peaks, of the light emitted from the light source 10 and to switch the light peak intensity included in the wavelength band.

Abstract: A compact hologram apparatus capable of high-speed processing is provided. A hologram apparatus 1 includes a light emitter 30 that applies light onto a recording medium 10 on which a plurality of holograms 11 are provided, and a light receiver 20 that receives light exiting from the holograms 11. The light receiver 20 includes a substrate 22 having multiple light-receiving elements 21 arranged on a surface thereof, and the light emitter 30 includes a plurality of light-emitting elements 31 arranged in an array on the substrate 22 of the light receiver 20 so as to be combined with the light receiver 20.

Abstract: A compact and low-cost hologram reproducing apparatus with a simple mechanism is provided. A light source 1 and a lens 11 for generating parallel light are provided on an inner surface of a housing 5. By changing the angle of a biaxially driven galvanometer mirror 2 provided at an appropriate position opposing the light source 1 and the lens 11, reflected light is applied two-dimensionally, in the vertical and horizontal directions, on a recording element 3 mounted below and adjacent to the housing, and is entered as reference light in holograms. Further, light beams exiting from the holograms are received at the same optimal position on a light-receiving element 4 disposed in an upper part of the housing. The received light is subjected to data decoding so as to reproduce read-only holograms.

Abstract: A functional multilayer film and a method for manufacturing the same is provided in which the intervals of fine metallic bodies in the thickness direction and the arrangement thereof in the surface direction are regular, and the fine metallic bodies arranged on each layer are aligned in the thickness direction. A functional multilayer film is obtained by fixing a plurality of fine metallic bodies to a matrix made of a dielectric substance. The matrix is obtained by laminating metal-arranged thin films, which each contain a dielectric thin film having a predetermined thickness and the fine metallic bodies arranged on the dielectric thin film. A plurality of recesses is regularly formed on the surface of the dielectric thin film, and the fine metallic bodies are arranged in the lower parts of the recesses.

Abstract: A holographic device includes a reference beam unit that makes reference beams incident on a plurality of holograms formed in a plate-shaped recording medium; and a light receiving unit that receives exiting light from the holograms. The reference beam unit includes a light emitting part that emits the reference beams, and sets the incidence position and the incidence angle of each of the reference beams emitted from the light emitting part such that each of the reference beams is incident on one of the plurality of holograms disposed in the thicknesswise direction of the recording medium. The light receiving unit includes a light receiving part that receives the exiting light from the holograms and a pin-hole filter disposed between the light receiving part and the recording medium.

Abstract: A positioning device capable of performing accurate positioning of holograms formed on a recording medium is disclosed. The positioning device includes a rotation driving unit for rotating a disk-shaped recording medium in a peripheral direction, a horizontal driving unit for moving the recording medium in a horizontal direction. The positioning of the recording medium is performed by the rotation driving unit and the horizontal driving unit. The rotation driving unit includes a central driving unit for rotating the recording medium on a central portion and a peripheral driving unit for rotating the recording medium at a peripheral edge. The peripheral driving unit includes a rotating part which is rotatable separately from the central driving unit. The rotating part is formed in the shape of a disk whose diameter is smaller than the recording medium and is disposed in the horizontal direction to the disk-shaped recording medium.

Abstract: There is provided a holographic recording medium having a recording layer on which holograms are formed by interference between an object beam and a reference beam to thereby record information. The recording layer is formed with a plurality of hologram groups each composed of a plurality of holograms. The holograms in each of the hologram groups have the same information, and adjacent holograms partially overlap each other. In addition, the holograms are arranged to be spaced apart from holograms in other hologram groups.

Abstract: There is provided a hologram device including a light source for generating light beams, in which the light beams emitted from the light source are incident on holograms formed on a recording medium and thus information recorded on the holograms is read. In addition, the light source includes a laser having plural peak wavelengths at the emission intensity of light beams to be generated, and a separation grating for emitting the light beams emitted from the laser at a plurality of different angles for each of the peak wavelengths.

Abstract: A hologram apparatus includes a light source that emits a reference beam, and reads information recorded on a recording medium as holograms using the reference beam. In the hologram apparatus, the light source has a plurality of light emitting units each emitting the reference beam, and the recording medium is formed with plural hologram groups each having a plurality of holograms that correspond to the reference beams emitted from the light emitting units, respectively.