Sanyo Electric Co., Ltd.

Kyocera Corporation

Toshihide Hamaguchi

Kouichi Kawakami

Masahiro Moriyama

Yoshiaki Maida

Satoru Kuge

Satoshi Sumi

Yoshihisa Suzuki

Noboru Mamiya

Kenji Nakao

Koichi Tada

Hiroshi Nakashima

Hiroki Koba

Hirokazu Genno

Tadashi Okajima

Hideharu Toda

Kenji Yamanaka

Tomohiro Goto

An information recording and reproducing apparatus for increasing a speed of tilt control, including a portion for storing reference data, a portion for storing sample values data, a portion for obtaining positional information, a stilt servo generator, a tilt adjuster.

Information recording and reproducing apparatus

In a notifying device comprising a notifying unithaving incorporated therein a vibrator to be resonated by a drive signal fed thereto, and a signal preparing circuitfor feeding the drive signal to the notifying unit, the signal preparing circuitprepares a drive signal Dv varying in frequency within a predetermined range including the resonance frequency of the vibrator of the unitand feeds the signal to the notifying unit. The variation of frequency of the drive signal is determined in correspond relation with a variation in the resonance frequency of the vibrator due to tolerances for specifications which govern the resonance frequency. The drive signal has an alternating waveform of rectangular waves or sine waves, and the frequency thereof varies periodically from 1.37 to 2.98 Hz. The notifying device achieves a satisfactory notifying effect despite the variation of the resonance frequency of the vibrator.

Alerting device and radio communication device having the alerting device

A disk apparatus includes a DSP core, and executes processing for focal point positioning when turning on the power to the apparatus main body or exchanging the MO disk. The DSP core detects maximum and minimum values of outputs (focus error signal) of an FE signal detector circuit while moving the objective lens from an uppermost position of not contacted with a disk surface to a lowermost position. The DSP core calculates a middle position using positions of the objective lens upon fetching maximum and minimum values (uppermost and lowermost positions). Subsequently, the DSP core determines a range narrower than a range to be determined by the uppermost and lowermost positions, by the use of the middle point and amount of surface deflection of the MO disk. Then, the DSP core wobbles the objective lens within the narrow range and detects a focal point based on a level of the focus error signal.

Disk apparatus with enhanced focal positioning

A vibration generator comprises a first vibrator having a permanent magnet and supported by a first spring body on a fixing member, and a second vibrator having a coil so disposed as to intersect the magnetic flux of the permanent magnet and supported by a second spring body on the fixing member. One of the first vibration system and the second vibration system serves as a sound source for producing sound waves of audio-frequency for propagation to the outside, and the other vibration system serves as a vibration source for transmitting vibration to the fixing member and vibrating a device.

Vibration generator for reporting and portable communication equipment using the same

A device comprises a vibration generator having a magnetic circuit composed of a permanent magnet and a coil, and a diaphragm drivable by the magnetic circuit and secured to a fixed member so as to mechanically resonate at a frequency of f,, a signal generating circuit for producing a signal having the frequency of f,, a filter for blocking the frequency of f,, and selection means. The selection means operates to give notice to the user by applying the signal containing the frequency of f,and generated by the signal generating circuit to the coil, or to deliver incoming speech to the user by applying a voice signal to the coil via the filter.

Vibration generator for notification and portable communication device using the vibration generator

A notifying device adapted to give notification with both sound and vibration includes a notifying unit,which comprises a first vibrator drivable at an audio-frequency with a first drive signal for producing sound waves, and a second vibrator drivable with a second drive signal at a frequency, up to several hundred of hertz, lower than the driving frequency of the first vibrator for producing a perceivable vibration. A notifying signal generating circuit,is connected to the unit,via a switch,The circuit,comprises a sound signal generating circuit,for producing an intermittent first signal repeating on and off states with a predetermined period, a vibration signal generating circuit,for producing an intermittent second signal repeating on and off states with the same period as the first drive signal, and a synchronization circuit,for causing the respective circuits,to produce the first drive signal and the second drive signal without any overlap between the on periods of these signals. This construction obviates marked increases in the power consumption of the device.

Notifying device using alternating drive signals

A magnetic recording/reproduction apparatus of an azimuth system for recording/reproducing a digital signal by helical scanning a magnetic tape has an SP mode and an LP mode having recording/reproducing time period N (N is an even number) times that of SP mode. The apparatus includes a pair of magnetic head units with opposite azimuth, disposed in close proximity on a circumferential face of a rotary head cylinder with difference in level therebetween corresponding to a predetermined track pitch t for scanning simultaneously two continuous tracks at that pitch. The cylinder is rotated at the same rotation speed in both SP and LP modes, while the tape travel speed is reduced to 1/N that of SP mode when LP mode is specified. When LP mode is specified, the data amount of a digital signal to be recorded is compressed to 1/N that in SP mode, which are provided to the magnetic heads 2-channel record data, and the data amount of reproduced 2-channel digital signals of is expanded by N. In SP mode, recording/reproduction is carried out by every 2 continuous tracks by the pair of magnetic heads for every 1 for rotation of the cylinder. In LP mode, recording/reproduction is carried out in a unit of 2 continuous tracks by the pair of magnetic heads for every N rotations of the cylinder.

Magnetic recording/reproduction apparatus which simultaneously scans two

Two kinds of large and small cassettes having respective unlocking apertures for fitting a common unlocking member therein can be loaded onto a chassis. When the cassettes are loaded in position with their tape centers in coincidence, the unlocking apertures are displaced from each other by .DELTA. Y. Mounted on the chassis are a pair of pivotal levers each supporting a reel support on a free end thereof, a drive slide reciprocatingly movable on the chassis for controlling the rotation of the pivotal levers and moving the reel supports to two different positions corresponding respectively to the large and small cassettes, a drive gear for driving the slide, and pressure contacting mechanism disposed between the gear and the slide for positioning and holding the slide in two cassette loading positions by pressing contact, with the rotation of the gear. The drive slide has the unlocking member projecting from its upper surface and is slidingly movable only by the distance .DELTA. Y in corresponding relation with the cassette loading positions.

Magnetic recording-reproduction apparatus having movable reel supports

A composite tray comprises a small cassette tray and a large cassette tray pivoted to inside portions of the tray. A first lid opener for opening the lid of a large cassette is pivoted to inside portions of the large cassette tray. Pivoted to the opener is a second lid opener pivotally movable in a plane parallel to the bottom surface of the large cassette for opening the lid of a small cassette. The second lid opener is positioned in a large cassette supporting region in the absence of the large cassette, but is pushed by the lid of the large cassette to escape to the outside of the tray when the cassette is placed on the tray.

Magnetic recording-playback apparatus for cassettes of two different

A time lapse VTR carrying out field extraction recording includes a gate for extracting intermittently a supplied video signal at a ratio of one field to every three fields, a switching circuit for designating selectively a tape running speed of either 1/9 or 1/12 the tape running speed of a SP mode in the VHS system, and a servo control circuit for driving a capstan motor to run a magnetic tape at the designated tape running speed. The video signal extracted intermittently by the gate circuit is recorded at an azimuth angle differing from each field by a plurality of video heads on a magnetic head running at the designated tape running speed. As a result, the reproduction compatibility of a magnetic tape having field extraction recorded by a time lapse VTR with an EP mode of a conventional VTR of the VHS system is ensured.

Video tape recorder carrying out field extraction recording and/or

A disc player having a tray drive mechanism, a disc clamp mechanism and a pickup assembly which are mounted on a fixed chassis. A spindle motor for drivingly rotating a turntable is coupled to a motor lift mechanism and drivable upward and downward relative to the chassis. The turntable is movable upward from a standby position below a tray in a loading completed position to a disc clamping completed position where the disc can be pressed into contact with a clamp of the disc clamp mechanism. A drive gear mechanism has a plurality of output portions coupled to the tray drive mechanism, the motor lift mechanism, and the pick-up assembly. The drive gear mechanism also has a power transmission change-over device for transmitting the power of a loading motor selectively to are of the clamps mechanism, the tray drive mechanism, and the pick-up assembly.

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Higashiosaka, Japan

Toshihide Hamaguchi