Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Yoshihiro Mushika

Osamu Kajino

Haruo Yamashita

Teruyuki Takizawa

Akira Kurozuka

Yoshihiro Kanda

Toru Kawabata

Yoshiteru Namoto

Hironori Tomita

Yasuki Matsumoto

Hiroshige Ishibashi

Tohru Kawabata

Mitsuaki Oshima

Hiroyuki Yamaguchi

Koichi Ogawa

Hideshi Ishihara

Osamu Mizuno

Yoshikazu Goto

Yoshito Saji

Yoshio Umeda

Hitoshi Fujii

Yoshihiro Ikawa

Yoshiharu Kobayashi

Kenji Takauchi

Yasuo Nishihara

Masayoshi Shioya

Masayuki Shinoda

Yoshiaki Nakatsuka

Tooru Kawabata

For a recording and playback optical head used for a dual layer disc, it is difficult to reduce the size and the cost due to the need to correct spherical aberration caused by a difference in thickness of a light-transmitting layer. A reflection mirror having a reflection surface on which light is reflected and provided with a member having ferromagnetism at the center, and a switching device that switches between a deformed state and a non-deformed state of the reflection mirror using a magnetic force are provided. The switching device includes a hard magnetic member, and a magnetizing member that magnetizes and demagnetizes the hard magnetic member. When light is concentrated on a first recording layer farther from the light-incident surface, the reflection mirror is used as a plane mirror, and when light is concentrated on a second recording layer closer to the light-incident surface, the reflection mirror is deformed in the shape of a concave surface by means of the switching device.

Deformable mirror, optical head, and optical recording and playback device

The invention provides an optical disk apparatus and an optical disk that are applicable to a multilayer optical disk, and enable tilt detection with a high precision. The optical disk has a transparent planar disk base member, a recording layer formed on the disk base member, and a reflecting layer in a certain positional relation to the recording layer. The optical disk apparatus includes a laser pointerfor irradiating a laser beam onto the recording layer of the optical disk by way of the disk base member to form a focusing spot on the recording layer, a photo-sensor arrayG for receiving a reflected beam from the reflecting layer, and an aberration mode detecting circuitH for detecting tilt of the optical disk by using an output from the photo-sensor arrayG.

Optical disk apparatus for detecting tilt of an optical disk, and an optical disk for tilt detection

A microactuator according to the present invention comprises a base, a movable sectionwhich is capable of displacement relative to the base, an elastic supporting memberfor supporting the movable section, and driving sectionstofor causing the movable sectionto be displaced. A specific relationship is imposed on a spring modulus responsive to a displacement of the movable sectionalong a vertical direction and a spring modulus responsive to a tilt angle of the movable section, and the diagonality between the driving force and the displacement of the movable sectionis increased, thus realizing accuracy improvements and simplification of control of the microactuator.

Micro actuator having tilt and vertical displacement and device having such micro actuator

A micro-mechanical structure system according to the present invention includes: a movable structure, at least a portion of the movable structurebeing formed of a single-crystalline material; an elastic supporting memberfor supporting the movable structure; a stationary electrode sectionat least partially opposing the movable structure; and a basewhich has a circuit section and to which the stationary electrodeis affixed. The stationary electrode sectionincludes a first electrode layer (upper stationary electrode layer)positioned relative to the movable structureand a second electrode layer (lower stationary electrode layer)positioned relative to the base, the first electrode layerand the second electrode layerbeing bonded to each other via adhesion layersand

Micromachine structure system and method for manufacturing same

A micro-mechanical structure according to the present invention includes: a base; an elastic supporting memberhaving elasticity, the elastic supporting memberbeing formed on the base; and a movable section supported by the elastic supporting memberso as to be capable of making a relative move with respect to the base. This movable section includes a movable electrodeopposing the basevia a first gap, and a mirrorbeing affixed to the movable electrodevia a vertical rib

Micromachine structure

According to the present invention, a moving element such as an electrostatically driven actuator is displaced by supplying a drive signal thereto. Meanwhile, a displacement sensing section senses its displacement and a calibrating section automatically calibrates the correlation between the drive signal and the displacement, thereby compensating for a variation in the characteristic of the actuator with time and according to the environment. A switching section selectively connects the single displacement sensing section to a plurality of moving elements one after another, thereby cutting down the circuit for displacement sensing.

Microactuator with displacement sensing function and deformable mirror including the microactuator

There has been a trade-off between the rigidity and the mass of a movable section of a microactuator, and also between the rigidity of the movable section and the electrostatic force. A microactuatorincludes: a base; a first comb electrodesupported by the basea movable sectionhaving a second comb electrodeopposing the first comb electrodeand at least one reinforcement ribprotruding toward the baseand an elastic supporting memberfor supporting the movable sectionso as to allow the movable sectionto be displaced with respect to the baseThe height of the second comb electrodeis different from the height of the at least one reinforcement rib

Microactuator having increased rigidity with reduced mass

To greatly increase the storage density of a storage apparatus, an electron beam E emitted from a cold cathodeis accelerated by an accelerating electrode, caused to converge by a convergence electrode, deflected by a deflection electrodeand applied to a minute region of a storage film. The storage filmincludes, for example, a phase change film. The film is rapidly heated and cooled to change into an amorphous state upon irradiation with an electron beam E with high energy, while being gradually cooled to change into a crystallized state upon irradiation with an electron beam E with approximately intermediate energy, thereby storing data. Upon irradiation with an electron beam E with low energy, the potential difference between a detection electrodeand an anodeis detected depending on the state, i.e., the amorphous or crystallized state, thereby reading stored data.

Information storage apparatus storing and reading information by irradiating a storage medium with electron beam

According to the present invention, a moving element Ai such as an electrostatically driven actuator is displaced by supplying a drive signal thereto. Meanwhile, a displacement sensing sectionsenses its displacement and a calibrating sectionautomatically calibrates the correlation between the drive signal and the displacement, thereby compensating for a variation in the characteristic of the actuator with time and according to the environment. A switching sectionselectively connects the single displacement sensing section to a plurality of moving elements Ai one after another, thereby cutting down the circuit for displacement sensing.

The objective of the present invention is to provide an optical disc which solves the problem that search for data recorded on an exchange-type medium such as an optical disc and the like and which allows search for data recorded in an optical disc to be performed with a simple operation. A transmitting/receiving antennais provided in an inner peripheral portion of an optical disc. An IC moduleconnected with transmission/reception ICincluding ID information is formed and embedded into a substrate the optical disc. Thus, an optical disc incorporating an IC module which can be produced on a mass-production basis can be achieved.

Optical disc and remote control device

An optical detection system according to the present invention includes: a spatial light modulator for modulating the phase of incoming light; a photodetector having a plurality of photosensitive areas to receive the light of which the phase has been modulated by the spatial light modulator; a photosensor selecting section for selecting at least one of the photosensitive areas and activating the selected photosensitive area effectively; and a modulation control section for providing a modulation pattern, associated with the photosensitive area that has been selected by the photosensor selecting section, for the spatial light modulator.

Optical sensor

A brushless motor control device includes a brushless motor including a rotor magnet and a stator coil; rotor position detection means for detecting positions of a plurality of magnetic poles of the rotor magnet; vibration detection means for detecting an unnecessary vibration of the brushless motor when the brushless motor is rotating; lead angle setting means for setting a magnitude of a lead angle such that a first output from the vibration detection means does not exceed a prescribed tolerable value; and lead angle correction means for providing the lead angle to a third output, from the rotor position detection means, in accordance with a second output from the lead angle setting means, so as to generate a translocation timing of a driving current to the stator coil.

Brushless motor control device and disc apparatus using the same

A microelectromechanical system includes a substrate, a transducer supported on the substrate and a conductor layer, which is also supported on the substrate and electrically connected to the transducer. The transducer includes a portion made of silicon or a silicon compound. The conductor layer is made of a refractory conductor, which includes, as its main ingredient, at least one element selected from the group consisting of copper, gold and silver. At least a portion of the conductor layer is located at an intermediate level between the silicon or silicon compound portion of the transducer and the substrate.

Microelectromechanical system and method for fabricating the same

A deformable mirror according to the present invention includes a substrate, a plurality of micromirrors, which are supported by the substratewhile being segmented from each other, and a plurality of driving sections, which drive the micromirrorsindependently of each other. Each of the driving sections includes a number of fixed electrodesto, and the same number of movable electrodesto, which are provided so as to face the fixed electrodesto. Each of the micromirrorsis coupled to at least two of the movable electrodesto, which are associated with the micromirrorThe deformable mirror can displace each micromirrorperpendicularly to the substrateand/or tilt the micromirrorwith respect to the substrate.

Deformable mirror and optical controller including the deformable mirror

A projector includes: a spatial light modulator, which receives pattern data, representing a pattern to be formed on a projection plane, and which spatially modulates incoming light in accordance with the pattern data; and a projection optical system for projecting the light, which has been reflected from the spatial light modulator, onto the projection plane in a reduced size. The spatial light modulator includes: an array of micromirrors to be driven in accordance with the pattern data; a substrate to support the array of micromirrors thereon; and a driving section, which is able to change the tilt of each micromirror with respect to the substrate and the displacement of the micromirror perpendicularly to the substrate on a micromirror-by-micromirror basis.

Growing community of inventors

Neyagawa, Japan

Yoshihiro Mushika