Victor Company of Japan, Limited

Tsuyoshi Ono

Kazuhiro Sato

Masatsugu Kitamura

Hideo Onoye

Norio Shibata

Katsuhiko Oguri

Fumiaki Ohno

Atsushi Hayami

Kazuo Hikawa

Masayoshi Uchida

Yukihiro Kishima

Hidetoshi Sato

Yutaka Morita

Hiroki Nakagami

Yoshiaki Tanaka

Yasuhiro Yamada

Hiroshi Ogawa

Yasuo Inoue

Mamoru Inami

Kazunori Namiki

Ryuji Horiuchi

Masahiko Okabe

Masayoshi Utida

Fumiaki Oono

Tatsuya Mukoyama

Takeshi Shimizu

Fumiaki Ono

The present invention provides an image recording apparatus and an excess liquid developer removing device used in the apparatus. In the image recording apparatus, the recording medium wound around the rotary drum is developed by liquid developer supplied from a developing device. A dish provided on the developing device is displaced in the vicinity of the recording medium wound around the rotary drum by being declined in a predetermined angle to prevent the bubbles from generating. The excess liquid developer attached on the recording medium is removed by the air from a nozzle of a blower. The nozzle is displaced by a nozzle displacing device in the vicinity of a developing electrode for supplying the liquid developer only in the midst of developing to prevent the nozzle from being chocked up with toner contained in the liquid developer. Further, the excess liquid developer collected to an end of the recording medium by the air are removed by a part of the excess liquid developer absorbing member caused by the contact therewith.

Image recording apparatus by a wet type electro-photographic method and

An electrostatic latent image developing method and an apparatus used in the latent image developing method are disclosed. In a first image developing method, a bias supply voltage provided to a developing dish is gradually increased during a developing process so as to prevent a decrease in an effective bias voltage applied to the developing dish caused by the attachment of the toner to the developing dish. Further, in a second developing method, the electrostatic latent image is formed on a photosensitive member by scanning a laser beam on a preliminarily charged photosensitive member in a lateral scanning direction, the thus formed latent image is developed by absorbing a toner in a liquid developer in a developing dish, wherein a cleaning pattern image having a large toner absorbability for absorbing the toner attached to a surface of the developing dish is provided on the photosensitive member by the laser beam before and/or after the latent image is formed on the photosensitive member.

Electrostatic latent image developing methods and apparatuses for use

A digital signal recording and reproducing apparatus comprises rotary magnetic heads for recording and reproducing digital signals on and from a magnetic tape, where the digital signals include a digitally modulated information signal and a specific signal which is in a frequency region different from that of the digitally modulated information signal, a circuit for frequency-selecting the specific signal from the reproduced digital signals, a circuit for measuring a period of the specific signal which is frequency-selected, a circuit for calculating a rate of change of a transmission rate of the reproduced digital signals from the measured period of the specific signal and for detecting a relative linear velocity between the rotary magnetic head and the magnetic tape.

Digital signal recording and reproducing apparatus having rotary

This invention relates to a digital audio tape recorder using a rotary magnetic head. On the tape which has been recorded using R-DAT, signals forming to the industry standards are recorded at a standard tape speed. The tape is caused to run at a speed faster than the standard tape speed and the recording signal is subjected to high speed reproducing while maintaining the rotational frequency of the head at a rotational speed at the time of recording. For realizing this, a bit clock signal generator for use in a digital signal demodulator is provided, which comprises means for generating a detection window pulse having a predetermined pulse width shorter than a period of a bit clock signal from either of time points of rise and fall of the waveform of a signal to be demodulated, or from both the time points thereof, said signal to be demodulated being a digital signal modulated in accordance with a modulation system such as a system constituted with a periodical signal intermittently including a phase information of the bit clock signal to deliver the detection window pulse to a phase locked loop including a phase comparison circuit and a voltage controlled oscillator as a comparison wave, thus allowing the voltage controlled oscillator in the phase locked loop to generate a bit clock signal, characterized by the provision of means for changing the pulse width of the detection window pulse in correspondence with changes in a bit rate of the demodulated signal.

Bit clock signal generator for use in a digital signal demodulator

A tape speed control system for a magnetic tape recorder allows a magnetic tape to be fed at any desired speed in a fast feed mode operation. In a fast feed mode operation, rotation periods of take-up and supply reels are detected and one of them is weighted relative to the other. The sum of the weighted and non-weighted periods is compared with a predetermined reference period and the resulting difference signal is used to control drive motors associated with the respective reels, thereby causing the tape to run at a desired speed regardless of the roll radius thereof built up on the take-up reel.

Tape speed control system for magnetic tape recorder

A pulse generator associated with a pickup arm drive motor produces a pulse train signal as the pickup arm moves inward and outward with respect to the turntable, and the number of the pulses is counted to detect the position of the pickup arm. In order to remove undesirable influence due to overshoot of the pickup arm caused by inertia of the pickup drive system, the number of the pulses is continuously counted by a counter within a microcomputer for a predetermined period of time after deenergization of the pickup arm drive motor so that the number of the pulses indicates the actual position of the pickup arm. In one embodiment, each pulse is detected by recognizing the rising edge when the pickup arm is moved in one direction, and each pulse is detected by recognizing the falling edge when the pickup arm is moved in the other direction.

Device and method for controlling a pickup arm of an automatic record

An automatic record disc playing apparatus comprises a tone arm having a connection part onto which a normal head shell having a plurality of terminals for transmitting signals which are picked up by a pickup cartridge and a head shell for automatic music piece selection play are selectively mounted, a circuit for producing a play mode changeover signal according to whether the normal head shell or the head shell for automatic music piece selection play is mounted onto the tone arm, and a circuit for urging the tone arm to perform an automatic music piece selection play operation and a normal play operation according to the play mode changeover signal produced by the circuit for producing the play mode changeover signal. The head shell for automatic music piece selection play has a detection part for detecting the sound groove portions, and the land portions between adjacent music pieces. The tone arm has a plurality of signal transmitting terminals which are connected to terminals for transmitting signals of the normal head shell and the head shell for automatic music piece selection play, and a plurality of terminals exclusively for the detection part which are connected to terminals exclusively for the detection part of the head shell for automatic music piece selection play. The circuit for producing the play mode changeover signal produces a play mode changeover signal according to whether the terminals exclusively for the detection part are or are not interconnected.

Apparatus for playing record discs in an automatic mode and an automatic

A separation band detecting circuit is used in an automatic program selection record player which has a photodetector which moves together with a tone arm and comprises a light-emitting element for emitting light against the surface of the record and a photosensitive element for receiving the light reflected at the record surface and producing an output in accordance with the light quantity of the received reflected light. The detecting circuit comprises an operational amplifier supplied with the output of the photodetector to its one input terminal, and a time constant circuit connected to the other input terminal of said operational amplifier, for giving a threshold level with respect to the operational amplifier and giving a time constant with respect to the level fluctuation in the threshold value. The time constant circuit varies the threshold level with a time constant, according to an input signal level to the one input terminal of the operational amplifier. The operational amplifier inverts its output when the relationship between amplitudes of the input signal level and the threshold level reverses.

Separation band detecting circuit in an automatic program selection

A moving-coil type stereo pickup cartridge comprises a vibration mechanism, including a stylus for tracing the groove of a sound track on a record disc, at least one coil plate provided in the vibration system and adapted to vibrate in response to vibrations of the stylus, and a structure for forming a magnetic field for the coil plate. The coil plate comprises a thin insulative substrate and a pair of left and right coils substantially symmetric with respect to a center line and formed by an electrically conductive thin film placed in a spirally wound pattern on at least one surface of the substrate. The magnetic field-forming construction comprises a permanent magnet and a pair of yokes adapted to clamp the permanent magnet. The pair of yokes have confronting surfaces for defining a gap in which the coil plate is interposed and a recessed substantially reverse V-shaped notch or cutout. The notch is defined by edge parts or facets. The configuration of the edge parts is such that the contour lines of the density of the leakage magnetic flux at least within the space confronting the coils and in the notch extend substantially at angles of plus and minus 45.degree. to the center line.

Stereo pickup with printed circuit coils mounted in a linear field

A pickup arm is equipped with a photo sensor assembly for detecting non-recorded portions on a disk. The sensor is located in such a position that horizontal distance between the stylus tip and the detecting point of the sensor measured in the direction of the radius of the turntable is substantially constant throughout the possible rotational angle of the arm. The rotational angle of the arm is measured and is modified by a given angle corresponding to the above mentioned distance. When this distance deviates from a standard value on replacement of the same with another, the variation may be readily corrected by manipulating a potentiometer. Prior to performing an automatic playback, the disk is scanned by the sensor and signals indicative of the arm angles corresponding to the non-recorded portions are stored. After scanning, the arm is controlled by comparing the actual angle of the arm with the prestored angles, to place the stylus on a right position on the disk to perform automatic playback in accordance with programmed information.

Programmable automatic record player

A record disc playing apparatus comprises a horizontal drive motor for imparting a horizontal rotational force to a tone arm an address signal generating device for generating an address signal corresponding to a horizontal rotational angle position of the tone arm and a control device including a memory device for storing the magnitude of an inside force to be produced on the tone arm in correspondence with the horizontal rotational angle position of the tone arm. The address signal generating device supplies the generated address signal to the control device. The control device reads out the magnitude of the inside force from the memory device corresponding to the supplied address signal, produces a signal for cancelling the inside force at the rotational angle position of the tone arm corresponding to the read out magnitude of the inside force and supplies the same to the horizontal drive motor.

Record disc playing apparatus with automatic cancellation of inside

A tone arm control system includes first and second manually operated keys for providing input signals to a control circuit. The control circuit detects which one of the keys is operated and drives a vertical motor in the tone-arm upward direction and subsequently drives a horizontal motor in a tone-arm horizontal direction depending on which one of the keys is detected as being operated. The control circuit includes a counter which starts counting clock pulses to detect when a predetermined count is reached. During the predetermined count period the horizontal motor is energized at a low voltage to move the tone arm at a relatively low speed. When the clock count exceeds the predetermined value the speed of the tone arm is increased to allow it to speedily approach a desired position located relatively remote from the tone arm.

Variable speed tone arm control system

A moving-coil type pickup cartridge comprises a vibration system including a stylus for tracing a sound groove of a record disc, at least one coil plate adapted to vibrate in response to vibration of the stylus of the vibration system, and an arrangement for producing magnetic fields with respect to the coil plate. The coil plate has at least one coil formed by thin film in a spirally-shaped pattern. The magnetic field producing arrangement has at least one permanent magnet for producing magnetic fields wherein are produced magnetic fluxes of mutually opposite directions respectively in regions of the coil resulting from substantially halving of the coil in the vibration direction thereof.

Pickup cartridge having means for producing magnetic fields of opposite

A moving-coil type pickup cartridge comprising a cantilever provided at the free end thereof with a stylus for tracing a sound groove of a record disc, a coil plate provided on the cantilever in a manner to vibrate in response to vibration of the stylus, and an arrangement for producing an effective magnetic field within a specific gap. The coil plate comprises a thin electrically insulating base plate and at least one coil which is formed from a thin film in a spirally-shaped pattern on at least one surface of the base plate. The coil plate has at least one upright part formed by bending the base plate together with a portion of the coil and interposed in a freely vibratory manner within said gap of the magnetic field producing arrangement and a mounting part integrally joined to the upright part and fixed to the cantilever.

Moving-coil type pickup cartridge

A pulse amplifier has a first grounded emitter transistor arranged to receive input pulses to change its on-off states in accordance with the presence and absence of the applied pulses and a pair of second and third transistors having their collectors connected in common to a power supply. The second transistor has its base connected to the collector of the first transistor and its emitter connected to the base of the third transistor. The third transistor has its emitter connected to an output terminal from which a high voltage heavy current pulse is obtained so that the pair of transistors change their on-off states alternately with the first transistor. A semiconductor circuit is connected across the emitter and base of the second transistor to instantly put the base potential of the third transistor to a level equal to the base potential of the second transistor when the second transistor changes its state from conducting to nonconducting to thereby assure short decay time at the trailing edge of the output pulse.

Growing community of inventors

Yamato, Japan

Tsuyoshi Ono