Hitachi, Ltd.

Fujitsu Corporation

Hitachi Heating Appliances Co., Ltd.

Hitachi Video Eng. Inc.

Yoshio Miura

Motoyuki Suzuki

Masuo Oku

Kazuhiro Kobayashi

Yukio Fukui

Akio Fukushima

Yoshimichi Kudo

Tooru Kawashima

Tooru Fujishima

Chiharu Takayama

Satoshi Ueda

Takeshi Saitoh

Yuki Shinada

Junichi Ikoma

Noboru Hasegawa

Masami Yamashita

Keizo Shimizu

Tokinori Furuichi

Hideaki Kikuchi

Katunobu Takeda

Takahiro Kawaguchi

Hisamitsu Tanaka

Kazuhiko Yamazaki

Masao Oguri

Yonemitu Mori

Masao Kotera

Koue Yusa

Masashi Sasaki

Masamichi Narita

A positional information managing device includes a processor. The processor is configured to manage first positional information of a first mobile device communicating with a network. The processor is configured to associate device information of a second mobile device connected to the first mobile device with the first positional information. The second mobile device communicates with the network through the first mobile device.

Positional information managing device, mobile terminal, and mobile device

A tracking control apparatus is provided for controlling a displacement error between a pickup system and a track when reproducing information recording on an information-recording and reproducing medium having tracks on which information is recorded or reproduced. The tracking control apparatus includes on-track detecting means for detecting a light beam is located on the track, traveling-direction detecting means for detecting the direction of the pickup system traveling toward the track from the displacement error and the output signal supplied by the on-track detecting means and outputting a traveling-direction signal representing the traveling direction, track-slippage detecting means for detecting a track-slippage signal representing the direction of the light beam being slipped out of a target track from the traveling-direction signal supplied by the traveling-direction detecting means, and tracking control means for supplying as a control signal the displacement error when the light beam is located on the target track or as a control signal the track-slippage signal supplied by the track-slippage detecting means when the light beam is not spotted on the target track and driving the pickup system in a manner to allowing the light beam to follow the tracks.

Tracking control apparatus for controlling the tracking of a target track

An apparatus for controlling the rotation of a motor to rotate a recording medium where an information signal and synchronizing signal are recorded. In such motor rotation control, normally the synchronizing signal reproduced from the recording medium is phase-compared with a reference synchronizing signal, and the motor rotation is so controlled as to eliminate the phase error between the two compared signals. And upon occurrence of any great variation in the motor rotation due to information dropout or the like on the recording medium, such variation is detected, and a rotational frequency signal obtained from a rotational frequency detector is phase-compared with a reference frequency signal generated on the basis of the data relative to the motor rotational frequency stored sequentially in a memory. Then the control mode is switched for controlling the motor rotation in such a manner as to eliminate the phase error between the two compared signals, whereby the problems including runaway of the motor and so forth can be solved.

Motor rotation control apparatus with motor rotational frequency memory

In a control system for a disc player for a CLV (constant linear velocity) type disc, in order to control a rotation of a spindle motor in response to a location of the disc to be read, there is provided a tachometer coupled to the motor for generating a rotation signal having a frequency corresponding to a rotation of the motor, signal generator for generating a reference signal having a frequency corresponding to the rotation suitable to the location to be read, and a drive circuit for controlling the rotation of the motor so that rotation is effected in accordance with the reference signal.

Access control system for rotating an information storage disc at a

A constant linear velocity disk rotating apparatus for rotating a disk storing data recorded therein substantially at fixed linear recording speed detects a signal recorded in the disk by signal detecting means, obtains a control signal through the comparison of phase of the signal detected from the disk and that of a reference signal by phase comparing means, and controls the rotating speed of the disk on the basis of the control signal. To maintain the sensitivity of phase error detection which tends to vary in proportion to the radial position r of the signal detecting means relative to the disk at a fixed level, the gain of the phase control system is regulated in inverse proportion to the radial position r of the signal detecting means according to the output of detecting means which detects the rotating frequency or period of the disk. The control signal provided by the phase comparing means is applied to disk driving means after regulating the gain thereof by varying the duty factor in transmitting the control signal to the disk driving means.

Constant linear velocity disk rotating apparatus

An optical information reproducing apparatus wherein a light spot is projected on a rotary disc on which information is recorded, thereby to reproduce the information recorded on the disc, is provided with detection means to detect an amount of eccentricity of the disc by counting a number of tracks on the disc which the light spot at rest traverses when the disc is rotated by one revolution, and eccentricity correction signal generation means to generate a sinusoidal wave signal whose amplitude is determined by the detected amount of eccentricity and whose period is determined by a rotational period of the disc. The position of the light spot is controlled in accordance with the sinusoidal wave signal and a tracking control signal.

Optical information recording apparatus with eccentricity correction

A tilting mechanism tilts the wafer holding portions for wafers in any direction with respect to the direction of ion beams emitted from an ion source. The tilting mechanism is comprised of a linking mechanism for transmitting the rotation of the receiving plates to the wafer holding portions, tilted links for tilting the wafer holding portions, and a shaft being coupled to the tilted links and moving in the rotary disc. The wafer holding portions provide spherical portions, and the spherical portions are inserted in the receiving plates. A pin of the preceiving plates is fitted into the groove of the wafer holding portion. The distances between the ion source and the respective wafers are maintained equal. The ion beam irradiates uniformly the respective wafers and treats uniformly the respective wafers.

Ion beam treating apparatus

A control circuit for an optical information recording apparatus having a recording device for optically recording information on a recording track of a recording medium, a recording positioning detection device detects the recording start position mark cut on the recording track when a recording start is commanded. Then, recording is started and continued for a predetermined number of tracks. When it is desired to interrupt the recording in mid course, a recording interruption is commanded and the recording is interrupted only when the first recording start position marks after the recording interruption command, has been detected.

Apparatus for controlling a recording operation of an optical

In the case where an information signal is optically recorded on the tracks of a disc-like recording medium, the apparatus of the invention confirms that no information signal is recorded on the track prior to recording the information signal in order to prevent the overlap recording of the information signal. This apparatus has a track jump pulse generating circuit and an RF signal detecting circuit and the light spot sequentially moves to the adjacent tracks by a plurality of times during one rotation of the track. The presence or absence of an RF signal is detected from each track and the presence or absence of the recorded track is checked at a high speed.

Optical disc recording/reproducing apparatus with recorded track-section

A control apparatus for controlling an optical video disk player capable of optical recording and reproduction of video and/or audio information on a recording medium by a light beam. The control apparatus comprises a tracking failure detection circuit detecting failure of the light beam to accurately track along a track formed on the recording medium, and a light beam control signal generator circuit reducing the energy of the light beam in response to the detection of the tracking failure by the tracking failure detection circuit, whereby recording of information on the recording medium is inhibited in the event of occurrence of a tracking error.

Control apparatus for optical video disk recorder/player

An optical disc player for optically recording the video information or audio information onto a recording medium or optically reproducing the recorded information. The disc player includes a search unit for searching an information track having no signals recorded thereon prior to additionally recording an information signal on the unrecorded track. The search unit has a level detection circuit for detecting the energy value of the light reflected by the recording medium or an RF signal detection circuit for detecting the RF signal component. When the reflected light energy exceeds a predetermined value or the RF signal component is not detected, the search unit regards the track as a track having no signals recorded thereon, the search operation for a track having no signals being terminated and information can be recorded of the track having no signals recorded thereon.

Control apparatus for optical disc player for locating blank tracks

A focus servo system for an optical video disc player. A pair of signals generated by two pairs of photo-cells are supplied to an adder and a differential amplifier, an output signal of the adder is supplied to a first comparator and an output signal of the differential amplifier is supplied to a second comparator. When an output signal of the adder reaches a reference voltage of the first comparator, a focus servo pull-in range is detected. Thereafter, when an output signal of the differential amplifier reaches a reference voltage of the second comparator, a stable operation condition of the focus servo system is detected and a servo system loop is closed so that a malfunction is prevented.

Focus servo system having object lens protection circuit for an optical

A stylus position detecting apparatus in use for a video disc player using a disc of the groove type, detecting plates for detecting leakage components of a high frequency signal supplied from a high frequency signal source and flowing through a flylead, and for reading out a recorded signal in a disc are provided on both sides of the flylead. The leakage signal components detected by the detecting plates are detected to positive and negative directions with respect to a reference voltage. These voltages obtained by the detections are added by an adder, to find a stylus position.

Stylus position detecting apparatus

A high frequency heating apparatus is provided with a hood so constructed as to limit infrared ray energy reaching an infrared ray detecting element for detecting infrared rays radiated from an object to be heated within a heating chamber. In heating apparatus, the influence by the reflection of infrared rays is minimized by making the absorption factor approach to about '1' with blackening the inner surface of the hood. Also, the rotation of a chopper to detect infrared rays radiated from the object through chopping operation is detected by a mechanical switch. The output signal from the infrared ray detecting element is synchronous-rectified in synchronism with the switching operation of the mechanical switch.

Microwave oven

Apparatus for winding a linear, elongated object into a coil including a bending roller assembly for bending the linear, elongated object into loops of the coil, and a leveling device for bringing the curvature of the coil to a predetermined level. The leveling device includes a base movable toward and away from the bending roller assembly so as to adjust the spacing between the bending roller assembly and the base, a plurality of sliders supported by the base and located circumferentially of the coil in spaced relation to one another for movement in sliding motion toward and away from the center of curvature of the coil, a plurality of leveling roller assemblies each supported by one of the sliders for imparting a bending moment to the coil to correct the curvature thereof to a desired value, and an actuator for radially positioning the sliders in accordance with the spacing between the bending roller assembly and the base. One of the two adjacent leveling roller assemblies imparts a bending moment to the coil in a direction which is opposite to the direction in which the other leveling roller assembly imparts a bending moment to the coil.

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Yokohama, Japan

Yoshio Miura