Patents by Inventor Kei Nishioka
Kei Nishioka 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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Publication number: 20220174811Abstract: A power substrate (101) of the present invention includes a plurality of insulating substrates (106) arranged side by side along a plurality of current paths (P) extending in the same direction, a plurality of MOS transistors (108) mounted on one major surface of each of the plurality of insulating substrates (106) with a first conductive layer (107) and a first solder bonding layer (109) in between, and a heat dissipation member (110) in contact with other major surfaces of all of the insulating substrates with a second conductive layer (107) and a second solder bonding layer (109) in between, and each of the current paths (P) is formed by connecting one or more of the MOS transistors (108) mounted on one of the insulating substrates (106) with one or more of the MOS transistors (108) mounted on a different one of the insulating substrates (106) in series with each other.Type: ApplicationFiled: March 26, 2020Publication date: June 2, 2022Inventors: Kei NISHIOKA, Toshio HANADA, Takashi NAKAMURA, Tsuyoshi FUNAKI
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Patent number: 7183655Abstract: A packaged semiconductor device has an integrated chip and a non-integrated chip. The integrated chip has an integrated circuit and first bump pads formed with a narrow pitch. The non-integrated chip has second bump pads formed so as to face the first bump pads, lead pads formed with a wide pitch (so as to permit connection thereto of wires), and wiring conductors electrically connecting these pads together. The two chips are connected together by way of bumps and are then sealed in resin. With this structure, it is possible to realize a low-cost packaged semiconductor device that can easily be mounted on a mother board.Type: GrantFiled: October 14, 2003Date of Patent: February 27, 2007Assignee: Rohm Co., Ltd.Inventor: Kei Nishioka
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Patent number: 6853869Abstract: A surround-sound circuit has a delay time memory (31) for storing a digital audio input signal IN, and outputs the stored input signal as a surround-sound signal a predetermined time later. The input signal is compressed by a compressor (32) in the form of ADPCM encoder before it is stored in the memory (31), and the compressed signal retrieved from the memory is expanded by an expander (33) in the form of ADPCM decoder before it is added to the input signal. The invention may reduce appreciably the amount of data to be stored in the memory, and hence the storage capacity of the RAM, without directly loping the audio input signal IN and hence avoiding appreciable deterioration of the signal IN.Type: GrantFiled: November 17, 2000Date of Patent: February 8, 2005Assignee: Rohm Co., Ltd.Inventor: Kei Nishioka
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Publication number: 20040075176Abstract: A packaged semiconductor device has an integrated chip and a non-integrated chip. The integrated chip has an integrated circuit and first bump pads formed with a narrow pitch. The non-integrated chip has second bump pads formed so as to face the first bump pads, lead pads formed with a wide pitch (so as to permit connection thereto of wires), and wiring conductors electrically connecting these pads together. The two chips are connected together by way of bumps and are then sealed in resin. With this structure, it is possible to realize a low-cost packaged semiconductor device that can easily be mounted on a mother board.Type: ApplicationFiled: October 14, 2003Publication date: April 22, 2004Applicant: ROHM CO., LTD.Inventor: Kei Nishioka
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Patent number: 6556036Abstract: A semiconductor integrated circuit device (IC) 10 incorporates an array Dch of measurement elements D1-Dm in the form of buffers for example connected in series. These elements represent standard internal elements of the IC 10. The array Dch is supplied with a signal in synchronism with a fast clock signal CLK of the IC 10. The propagation speed of the signal is given in terms of the number of the measurement elements through which the propagation signal has passed in one clock interval. This can be done by simply supplying the IC 10 with a test signal GO and a reset signal RES as the instruction signals from an external tester. A tester slower in the operating frequency than the IC 10 can be used to measure the propagation speed of the IC 10.Type: GrantFiled: June 27, 2001Date of Patent: April 29, 2003Assignee: Rohm Co., Ltd.Inventor: Kei Nishioka
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Publication number: 20020000827Abstract: A semiconductor integrated circuit device (IC) 10 incorporates an array Dch of measurement elements D1-Dm in the form of buffers for example connected in series. These elements represent standard internal elements of the IC 10. The array Dch is supplied with a signal in synchronism with a fast clock signal CLK of the IC 10. The propagation speed of the signal is given in terms of the number of the measurement elements through which the propagation signal has passed in one clock interval. This can be done by simply supplying the IC 10 with a test signal GO and a reset signal RES as the instruction signals from an external tester. A tester slower in the operating frequency than the IC 10 can be used to measure the propagation speed of the IC 10.Type: ApplicationFiled: June 27, 2001Publication date: January 3, 2002Applicant: ROHM CO., LTD.Inventor: Kei Nishioka
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Patent number: 5570427Abstract: There is substantially provided a muting control circuit in which there is no difference in muting time between the muting utilizing capacitor charging and that utilizing capacitor discharging. A constant current source is in parallel with an external capacitor. The constant current source operates so as to decrease a charging current in the course of charging the external capacitor 20, whereas it operates so as to increase a discharging current in the course of discharging. Therefore, no substantial difference in muting time occurs.Type: GrantFiled: July 11, 1994Date of Patent: October 29, 1996Assignee: Rohm Co., Ltd.Inventor: Kei Nishioka
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Patent number: 5508658Abstract: A power amplifier circuit for an audio signal is provided with a switching control circuit and a switching circuit between an amplifier and a power source line or ground line and a smoothing circuit which smoothes current from the switching circuit and supplies the current to the amplifier, and the smoothing circuit is provided with a change-over switching circuit which operates to return a commutation current generated during switching OFF time to the smoothing circuit.Type: GrantFiled: April 24, 1995Date of Patent: April 16, 1996Assignee: Rohm Co., Ltd.Inventors: Kei Nishioka, Masanori Fujisawa
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Patent number: 5483197Abstract: The present invention includes a first amplifier, a second amplifier, a switching circuit for switching power from a power source line at a frequency exceeding an audible frequency and feeding the first or second amplifier, a control circuit for controlling a switching period of the switching circuit such that the feeding power is changed correspondingly to a level of the audio signal correspondingly to a first difference in voltage between one of the audio signal and the audio signal amplified by the amplifier and the power or a second difference in voltage between one of the audio signal and the audio signal amplified by the second amplifier and the feeding power, a smoothing circuit for smoothing a power fed by said switching circuit and a capacitor adapted to be charged by a portion of current flowing from said smoothing circuit when the switching circuit is in OFF state and generating discharge current to be added to the output of one of the first and second output stage amplifiers when the switching cirType: GrantFiled: September 26, 1994Date of Patent: January 9, 1996Assignee: Rohm Co., Ltd.Inventors: Kei Nishioka, Masanori Fujisawa, Katsumi Kusaba
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Patent number: 5479134Abstract: The present invention includes a first push-pull amplifier for amplifying an audio signal, a second push-pull amplifier for inverting and amplifying the audio signal, a switching circuit for switching power from a power source line at a frequency exceeding an audible frequency and feeding the first or second amplifier, a control circuit for controlling a switching period of the switching circuit such that the feeding power is changed correspondingly to a level of the audio signal correspondingly to a first difference in voltage between one of the audio signal and the audio signal amplified by the amplifier and the power or a second difference in voltage between one of the audio signal and the audio signal amplified by the second amplifier and the feeding power and a capacitor provided between the outputs of the first and second amplifiers, a loud speaker being driven by outputs of the first and second amplifiers.Type: GrantFiled: September 19, 1994Date of Patent: December 26, 1995Assignee: Rohm Co., Ltd.Inventors: Kei Nishioka, Masanori Fujisawa, Katsumi Kusaba
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Patent number: 5450036Abstract: The present invention includes an amplifier for amplifying an audio signal, a switching circuit for switching power from a power source line at a frequency exceeding an audible frequency and feeding the amplifier and a control circuit for controlling a switching period of the switching circuit such that the power feeding the amplifier correspondingly to a difference in voltage between the feeding power and one of the voltage of the audio signal and the voltage of the audio signal amplified by the amplifier is changed correspondingly to a level of the audio signal.Type: GrantFiled: February 22, 1994Date of Patent: September 12, 1995Assignee: Rohm Co., Ltd.Inventors: Kei Nishioka, Masanori Fujisawa
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Patent number: 5424684Abstract: The present invention includes a first push-pull amplifier for amplifying an audio signal, a second push-pull amplifier for inverting and amplifying the audio signal, a switching circuit for switching power from a power source line at a frequency exceeding an audible frequency and feeding the first or second amplifier and a control circuit for controlling a switching period of the switching circuit such that the feeding power is changed correspondingly to a level of the audio signal correspondingly to a first difference in voltage between one of the audio signal and the audio signal amplified by the amplifier and the power or a second difference in voltage between one of the audio signal and the audio signal amplified by the second amplifier and the feeding power, a loud speaker being driven by outputs of the first and second amplifiers.Type: GrantFiled: March 1, 1994Date of Patent: June 13, 1995Assignee: Rohm Co., Ltd.Inventors: Kei Nishioka, Masanori Fujisawa
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Patent number: 5371476Abstract: In an amplifying circuit of current subtraction type, a first output of a differential amplifier is coupled through a first transistor to an output electrode of an output-side transistor of a current mirror circuit and a second output of the differential amplifier is coupled through a second transistor to an input electrode and an output electrode of an input-side transistor of the current mirror circuit so that an output current based on a difference between the first output and the second output flows out from a connection of the first transistor and the output-side transistor of the current mirror circuit. A first circuit device for phase compensation is inserted between bases of input-side and output-side transistors of one of the first and second transistors, and a second circuit device for compensating a direct current offset generated by the first circuit device is .inserted between bases of input-side and output-side transistors of the other of the first and second transistors.Type: GrantFiled: November 16, 1992Date of Patent: December 6, 1994Assignee: Rohm Co., Ltd.Inventor: Kei Nishioka
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Patent number: 5367412Abstract: A recording/reproducing circuit according to the present invention comprises a recording amplifier for outputting a recording signal, a differential amplifier including a pair of transistors, a base of one of the transistors being a (+) side input, a base of the other transistor being a (-) side input, emitters of the transistors being connected commonly to a current source, the (+) side input being supplied with the recording signal, an output signal being fedback to the (-) side input, the output signal being sent to a recording head and means for cutting a current of the current source to thereby stop an outputting of the recording signal from the differential amplifier circuit.Type: GrantFiled: September 8, 1993Date of Patent: November 22, 1994Assignee: Rohm Co., Ltd.Inventors: Kei Nishioka, Chung Chien San
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Patent number: 5220613Abstract: An audio amplifier circuit according to the present invention features an arrangement of a power line with a smoothing capacitor inserted as a power filter and a power line without such a smoothing capacitor. The audio amplifier circuit in which an input stage amplifier of a main amplifier is supplied with power via the former power line has a muting circuit for rapidly charging a negative feedback capacitor for generating negative feedback voltage to be fed back from the following stage of the main amplifier to the input stage amplifier up to a voltage level at which a pop sound is inhibited when the power is supplied and for rapidly discharging the negative feedback capacitor up to a reference operating voltage level when the voltage of the former power line with the smoothing capacitor exceeds a predetermined level, the voltage of the former power line being monitored after the power is supplied from a power supply.Type: GrantFiled: July 25, 1991Date of Patent: June 15, 1993Assignee: Rohm Co., Ltd.Inventors: Kei Nishioka, Chung Chien San
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Patent number: D926031Type: GrantFiled: February 5, 2020Date of Patent: July 27, 2021Assignee: HISAMITSU PHARMACEUTICAL CO., INC.Inventors: Kei Nishioka, Shigeo Kusumi
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Patent number: D963574Type: GrantFiled: April 10, 2020Date of Patent: September 13, 2022Assignee: Fukushima SiC Applied Engineering Inc.Inventors: Kei Nishioka, Toshio Hanada, Yoshimi Nishimura, Takashi Nakamura
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Patent number: D981958Type: GrantFiled: April 23, 2021Date of Patent: March 28, 2023Assignee: Fukushima SiC Applied Engineering Inc.Inventors: Kei Nishioka, Yoshimi Nishimura, Takashi Nakamura
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Patent number: D999166Type: GrantFiled: April 22, 2021Date of Patent: September 19, 2023Assignee: Fukushima SiC Applied Engineering Inc.Inventors: Kei Nishioka, Yoshimi Nishimura, Takashi Nakamura