Abstract:
PROBLEM TO BE SOLVED: To correct spherical aberration due to errors in the thickness of a disk plate and to contrive the miniaturization and thin profile of the entire device. SOLUTION: The optical pickup device is equipped with a two-group objective lens 18 that focuses a laser beam on the recording layer of an optical disk having a light transmitting layer on the recording layer to record information, and with an aberration correcting member 15 that corrects spherical aberration and detects the thickness of the light transmitting layer of the optical disk. Further, this aberration correcting member 15 has the parallel type liquid crystal which is installed with the orientation direction made parallel to the polarization direction of an incident light beam, a pair of transparent substrates 24 between which this liquid crystal is sealed in, a transparent electrode 28 which has the first and second transparent electrodes 26, 27 arranged nearly concentrically on the main surface of at least one of the substrates 24, and an electrode terminal 23 provided on the outer periphery of the substrates 24 and electrically connected to each transparent electrode 26, 27.
Abstract:
PURPOSE:To improve the controllability of focusing, etc., by prescribing the lengths of effective conductive parts contributing to each driving force of plural coil elements forming a focusing coil, etc. CONSTITUTION:In the coil element crossing the plural magnetic fields 11 forming a focusing coil by a magnetic field 11 generated between a magnet 7 mounted on an inner yoke 10 and an opposite yoke 9, driving force corresponding to a supplied current is generated. Since the length of the effective conductive part contributing to the driving force of the coil is set shorter in an effective coil close to the magnet 7 than others, the driving force generated in each coil element becomes nearly the same. Consequently, in the frequency characteristic of an objective lens, the generation of a peak deteriorating the controllability between primary resonant frequency and secondary resonant frequency is prevented and the controllability for controlling the objective lens is enhanced.
Abstract:
PURPOSE:To enable a head to be withdrawn from any position of a disk and to keep the head from contacting with the disk. CONSTITUTION:1st and 2nd supporting arm members 14R and 14L are provided to be extended from a rigid arm 2 over to the side of the head 12, and a leaf spring 18 is fixed to the 1st and 2nd supporting arm members 14R and 14L to be engageable with a suspension 8 on the side of the disk 40, and a piezoelectric element 16 is disposed between the 1st and 2nd supporting arm members 14R and 14L.
Abstract:
PURPOSE:To enable a head to be withdrawn from any position of a disk and to keep the head from coming in contact with the disk. CONSTITUTION:1st and 2nd arm members 14R and 14L are provided to be extended from a rigid arm 2 over to the side of the head 12, and a plate member 18 is fixed to the 1st and 2nd arm members 14R and 14L so as to be engageable with a suspension 8 on the disk side, and then at least one of the 1st and 2nd members 14R and 14L is composed of a piezoelectric element. Thus, since the arm members 14R and 14L and the plate member 18 are moved together with the suspension 8, the head 12 can be withdrawn from an optional position of the disk.
Abstract:
PURPOSE:To improve the efficiency by making the effective length between the supporting parts at the opposite ends of a resilient body adjustable with respect to a fixed block thereby setting in a resonant state. CONSTITUTION:A linear ultrasonic wave motor 1 is provided with a rectangular resilient body 3 having opposite ends supported by a fixed block 2. A pair of oscillators 4, 5 are secured onto one face thereof. The oscillators 4, 5 comprise piezoelectric elements with poling directions reversed from each other, and arranged such that a primary mode bending oscillation(standing wave) is induced in the resilient body 3. Resilient pieces 6, 7 are planted at antinode positions of the resilient body and piezoelectric elements 8, 9 are adhered to the opposite faces. A moving body 10 is pressed against the ends of the resilient pieces 6, 7. The resilient body 3 is held by means of the fixed block 2 and a retaining board 12, and then the effective length of the resilient body 3 is adjusted so that the resonance frequency of the resilient pieces 6, 7 will match with that of the resilient body 3.
Abstract:
PURPOSE:To reduce friction between a tape guide and a tape by adopting the hollow tape guide, mounting a vibrator made of a piezoelectric substance to the hollow inner surface and using the vibrator so as to exert vibration to the tape guide. CONSTITUTION:A hollow tape guide 28 is employed and a vibrator 40 made of a piezoelectric substrate is fitted to the hollow inner surface and the vibrator 40 exerts vibration to the tape guide 28. For example, a square chamfered throughhole is provided in the inside of the tape guide 28 and 4 piezoelectric substances 40a - 40d are adhered in a way of the polarization direction opposite alternately to each other to each side respectively. When a voltage is applied to the piezoelectric substances 40a - 40d for exciting them, the resonance mode appears and four nodes and four loops are formed on the surface of the tape guide 28, a secondary standing wave is caused, and a magnetic tape 14 wound on the tape guide 28 is energized by the standing wave and then floated. Thus, the contact area of the tape is reduced in comparison with the case of no standing wave and then friction is reduced.
Abstract:
PROBLEM TO BE SOLVED: To provide a stereoscopic display device having a wide horizontal viewing angle.SOLUTION: A polarizing plate 28 is configured to p-polarize a stereoscopic image light beam which has been spatially modulated in a first spatial modulation area P1 of a liquid crystal panel unit 24 based on a stereoscopic image signal, and s-polarize planar image light beams which have been spatially modulated in second and third spatial modulation areas P2 and P3, respectively based on planar image signals. The p-polarized light beam (p-polarized light L1) and the s-polarized light beams (s-polarized light L2, L3) polarized in the projector 6 are projected onto a screen 10. First and second polarized beam splitters 11 and 12 of the screen 10 are configured to transmit the p-polarized light L1 for a stereoscopic image, and refract the s-polarized light beams L2 and L3 for a planer image in a horizontal direction, respectively. While a stereoscopic image observable area A1 is secured at the front of the stereoscopic image display device, planar image observable areas A2 and A3 are secured on the external left and right sides of the area A1.
Abstract:
PROBLEM TO BE SOLVED: To provide a screen capable of suppressing vertical stripe irregularity and an image display device equipped with the screen as an image display device that performs stereoscopic display by using a plurality of projection devices. SOLUTION: A vertical diffusion screen 10 includes lenticular sheets 12 and 13 turning a side of center O of curvature of a partial cylinder toward a reverse side to a projection part 6. Therefore, an incident angle obtained when a light beam from the projection part 6 is made incident on the vertical diffusion screen 10 is made small. Namely, the light beam from the projection part 6 is made incident vertically to the vertical diffusion screen 10 as shown in Fig.5. As a result, the light beam is linearly diffused in a vertical direction on the vertical diffusion screen 10, and the vertical stripe irregularity is suppressed. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a surface light source device having a configuration and structure for surely preventing the occurrence of a problem in which color and brightness irregularities occur by allowing radiation of light emitted from a light emitting element assembly to be asymmetric to an axis line of the light emitting element assembly. SOLUTION: The surface light source device includes light emitting elements 101G, 101B and a plurality of the light emitting element assemblies 100G, 100B provided with lenses 102 passed by light emitted from the light emitting elements 101G, 101B as light sources. The surface light source device for illuminating a transmission liquid crystal display having a display region composed of pixels arranged in the form of a two-dimensional matrix from a rear face arranges the same dummy lenses 110 as the lenses 102 composing the light emitting element assemblies 100G, 100B in the vicinity of the light emitting element assemblies 100G, 100B. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To project a video that has a depth, by reducing the pitch of each interval between image projection elements while ensuring high image quality. SOLUTION: In the image display apparatus, a plurality of liquid crystal display elements 13 serving as optical modulation elements are disposed on a spiral B formed around one straight line as a center axis A. This makes it possible to escape the liquid crystal display elements 13 outward more widely around the center axis A as their center. Accordingly, a stereoscopic image display apparatus 1 that is more compact as a whole can be obtained. A plurality of mirrors 9 serving as optical members so that the directions of the optical axes of luminous fluxes emitted from a plurality of reduction lens systems 15 serving as optical systems are arranged on the center axis A. Thus, a luminous flux parallel to, for example, the optical axis direction E1 can be made incident on each magnifying lens system 18 serving as a projection optical system, and the plurality of magnifying lens systems 18 can be arranged close to one another parallel to the center axis A. COPYRIGHT: (C)2008,JPO&INPIT