Patents by Inventor Nobuyoshi Yokobori
Nobuyoshi Yokobori has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5132947Abstract: A combined memory medium is constructed by an optical disc used as a read-only memory, a cartridge for holding or receiving the optical disc, and a fixed memory which is held in the cartridge. The read or write operation for the fixed memory is carried out by structure different from that used for the optical disc so that the optical disc and the fixed memory constitute an integral memory medium. A combined memory medium drive apparatus includes the combined memory medium, a disc access block for reading out the data on the optical disc, a memory access block for performing reading or writing of data for the fixed memory, and a control block for interpreting an instruction sent from an external device to control the reading of data from the optical disc through the disc access block and the reading or writing of data for the fixed memory through the memory access block, in which the optical disc and the fixed memory are complementarily used.Type: GrantFiled: March 3, 1989Date of Patent: July 21, 1992Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Keiichi Kameda, Kazutsugu Kobayashi, Nobuyoshi Yokobori, Hiroyuki Iitsuka
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Patent number: 4695907Abstract: A rotary head deflection apparatus for allowing magnetic heads to properly scan signal tracks recorded on a magnetic tape, and used for a helical scan system video tape recorder, which is constituted of driving coils wound onto a stator and movable members carrying magnetic heads and magnets, so that the driving coils are energized to enable the magnetic heads to be displaced in the direction of the axis of rotation of the rotary member.Type: GrantFiled: November 15, 1984Date of Patent: September 22, 1987Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Toshio Inaji, Hiroshi Okamoto, Nobuyoshi Yokobori
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Patent number: 4608524Abstract: An output circuit to drive a current into a load. Collector voltage of a current controlling transistor is automatically adjusted to maintain h.sub.FE of the transistor constant, whereby saturation of the transistor and excessive power consumption are avoided. A brushless motor using the output circuit. Current detectors detect emitter current and base current of output transistors and h.sub.FE of the transistors are kept constant, whereby excessive torque loss and harmful vibration are avoided. A limiter limits excessive torque control to prevent power transistor saturation. A switching mode power supply adjusts the collector voltage of the transistor in a feedback loop to keep h.sub.FE constant.Type: GrantFiled: April 29, 1985Date of Patent: August 26, 1986Assignee: Matsushita Electric Industrial Co., Ltd.Inventor: Nobuyoshi Yokobori
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Patent number: 4535276Abstract: An output circuit to drive a current into a load. Collector voltage of a current controlling transistor is automatically adjusted to maintain h.sub.FE of the transistor constant, whereby saturation of the transistor and excessive power consumption are avoided. A brushless motor using the output circuit. Current detectors detect emitter current and base current of output transistors and h.sub.FE of the transistors are kept constant, whereby excessive torque loss and harmful vibration are avoided. A limiter limits excessive torque control to prevent power transistor saturation. A switching mode power supply adjusts the collector voltage of the transistor in a feedback loop to keep h.sub.FE constant.Type: GrantFiled: January 10, 1984Date of Patent: August 13, 1985Assignee: Matsushita Electric Industrial Co., Ltd.Inventor: Nobuyoshi Yokobori
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Patent number: 4484235Abstract: A phase control circuit for improving the stability after a predictable rotational speed change of a rotating apparatus and a magnetic reproducing apparatus for performing slow motion reproduction by means of intermittent tape transport and yet being free from transverse swings of the reproduced picture comprises a phase shift circuit which shifts the phase of the reference signal, which is produced by dividing a source signal, at a desired rate, to maintain the phase locked at the very moment during which the rotational speed change is changing. The relative speed of the magnetic head rotation is kept constant during the intermittent tape movement under the condition of the phase being locked.Type: GrantFiled: June 18, 1981Date of Patent: November 20, 1984Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Nobuyoshi Yokobori, Masashi Urayama, Yoshiaki Igarashi
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Patent number: 4395682Abstract: A differential output circuit for generating a bipolar DC current for an armature winding without requiring a bipolar power source. A combination of transistors and resistors are utilized to effectively apply a bipolar driving current. The use of only transistors and resistors in the differential output circuit enables its easy implementation as an integrated circuit.Type: GrantFiled: December 29, 1980Date of Patent: July 26, 1983Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Nobuyoshi Yokobori, Tetsuo Maeda, Yoshiaki Igarashi
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Patent number: 4393422Abstract: A device for intermittently driving a magnetic tape has a capstan for driving the magnetic tape, a motor directly connected to the capstan for driving the capstan, a tachometer for detecting the rotating speed of the motor and producing an output, and a speed control having a settable speed controller for setting a desired motor speed and into which the output from the tachometer is fed back for enabling the speed control to sense when the motor is rotating at the desired motor speed. An intermittent drive control is provided for supplying a triggering signal to trigger said settable speed controller to cause the settable speed controller to operate the speed control for accelerating the motor to the desired motor speed and driving it at that speed, the intermittent drive control supplying the triggering signal in response to a speed setting signal and a head switch signal.Type: GrantFiled: April 2, 1981Date of Patent: July 12, 1983Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Nobuyoshi Yokobori, Masashi Urayama, Hiroshi Okamoto, Yoshiaki Igarashi
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Patent number: 4344023Abstract: A drive system for a brushless dc motor to control the magnitude of the torque of a motor which has permanent magnet rotor and Hall generators. Multipliers determine the magnitude of current to each phase armature winding so as to determine the current sharing rate among the armature windings according to the rotation angle of the rotor, whereby degrading of torque uniformity due to variation of Hall generator characteristics is avoided. Each multiplier multiplies 2 signals, one being the output of the Hall generator, the other being the difference between the torque control input and the fed back signal of total armature current. Also a torque direction input is supplied to each multiplier to determine the direction of the rotational torque.Type: GrantFiled: November 19, 1980Date of Patent: August 10, 1982Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Nobuyoshi Yokobori, Yoshiaki Igarashi, Tetsuo Maeda