Patents by Inventor Yasuhiro Yamakawa
Yasuhiro Yamakawa 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: 20160147062Abstract: A scanning-type projection device is provided with an emitted-light-intensity control unit for controlling the light intensity of a laser light emitted by a laser light source unit, a polarization direction control unit for controlling the polarization direction of the laser light, a scanning unit for scanning the laser light and generating a display image, and a divergence unit on which the laser light scanned by the scanning unit is incident. The emitted-light-intensity control unit has a polarization control element for controlling the polarization state of the laser light, and a polarizing plate on which the laser light emitted from the polarization control element is incident, and the polarization direction control unit adjusts the polarization direction of display light incident on a projection surface by controlling the polarization direction of the laser light emitted by the emitted-light-intensity control unit.Type: ApplicationFiled: July 14, 2014Publication date: May 26, 2016Applicant: NIPPON SEIKI CO., LTD.Inventors: Yasuhiro YAMAKAWA, Shun SEKIYA
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Publication number: 20160139416Abstract: A color mixing device and a display device are configured to represent the color white in a consistent fashion, even in low-luminance areas. These devices are provided with: a red light source for outputting red light at optical intensity in response to a first current presented thereto; a green light source for outputting green light at optical intensity in response to a second current presented thereto; a blue light source for outputting blue light at optical intensity in response to a third current presented thereto; and a color mixing means for color mixing of the red light, the green light, and the blue light together. A light attenuating part transmits or reflects the blue light, bringing about attenuation and advance thereof in the output direction. The blue light output by the blue light source is attenuated to a greater extent than the light of the other colors during output.Type: ApplicationFiled: June 19, 2014Publication date: May 19, 2016Inventors: Yasuhiro YAMAKAWA, Shun SEKIYA
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Publication number: 20150300060Abstract: An unlocking lever device includes: a lever member which is operated to rotate to allow a locking mechanism to perform an unlocking operation; a sign member which is stored in a storage recessed portion provided in the lever member; a bias member which biases the sign member in a direction of protrusion from the storage recessed portion; and an inclined surface which regulates the protrusion of the sign member from the storage recessed portion in accordance with a position of rotation of the lever member by being abut against the sign member, and generates a bias force which allows the lever member to rotate.Type: ApplicationFiled: April 17, 2015Publication date: October 22, 2015Applicant: AISIN SEIKI KABUSHIKI KAISHAInventors: Kazuya IWASA, Yasuhiro YAMAKAWA
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Publication number: 20150260984Abstract: In order to enable a display image with stable display colors and display brightness to be obtained quickly even when the optical intensity characteristic of a laser light source changes due to a harsh usage environment, a Dimmer unit is equipped with: a first light detection unit that modulates the light intensity of composite laser light emitted from a composite laser light emission unit, and detects the light intensity of the composite laser light before entering the Dimmer unit; and a second light detection unit that detects the light intensity of the composite laser light after entering the Dimmer unit. The light intensity characteristic for each color in the composite laser light emission unit is calculated on the basis of the light intensity detected by the first light detection unit, and the white balance of each color in the composite laser light emission unit is adjusted on the basis of the light intensity detected by the second light detection unit.Type: ApplicationFiled: September 6, 2013Publication date: September 17, 2015Inventors: Yasuhiro Yamakawa, Shun Sekiya
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Patent number: 9081184Abstract: A head-up display device and a self-checking method therefor are provided, which are able to suppress the direct output of a laser beam to outside. A reflecting means reflects an image generated by a scanning means and projects the image outside of a case, and an angle-adjusting means adjusts the reflecting means to a desired angle. After the ignition switch of the vehicle is turned on, a light-emitting means outputs a scanning laser beam, and the value of the current flowing to the light-emitting means is detected, or a first light intensity, which is the light intensity of the scanning laser beam, is detected. For a period extending at least from the output of the scanning laser beam by the light-emitting means to the establishment of a predetermined condition, the angle-adjusting means is controlled such that the reflecting means is set to a non-visible position at which the scanning laser beam is reflected inside the case.Type: GrantFiled: December 5, 2012Date of Patent: July 14, 2015Assignee: NIPPON SEIKI CO., LTD.Inventors: Yasuhiro Yamakawa, Tsuyoshi Nakahara, Makoto Hada, Shun Sekiya, Kazuyoshi Yamada
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Publication number: 20150092118Abstract: Provided is a display device for a vehicle that can, in a configuration in which the cost of parts is curbed, quickly raise the temperature of a laser light source (LD) in a low temperature environment, and quickly perform stable image output. The LDs (11, 12, 13) emit laser light (RGB) and an MEMS mirror (30) scans the laser light (RGB) and generates a display image (M). A convex mirror (70) reflects display light (L) indicating the display image (M) in an external direction via a translucent light-transmitting unit (90). An LD driving means (101) emits laser light (RGB) to the LDs (11, 12, 13) when the temperature is low, and causes the LDs (11, 12, 13) to perform self-heating driving for raising the temperature of themselves.Type: ApplicationFiled: March 7, 2013Publication date: April 2, 2015Applicant: NIPPON SEIKI CO., LTD.Inventors: Makoto Hada, Shun Sekiya, Yasuhiro Yamakawa
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Publication number: 20150022898Abstract: A head-up display device and a self-checking method therefor are provided, which are able to suppress the direct output of a laser beam to outside. A reflecting means reflects an image generated by a scanning means and projects the image outside of a case, and an angle-adjusting means adjusts the reflecting means to a desired angle. After the ignition switch of the vehicle is turned on, a light-emitting means outputs a scanning laser beam, and the value of the current flowing to the light-emitting means is detected, or a first light intensity, which is the light intensity of the scanning laser beam, is detected. For a period extending at least from the output of the scanning laser beam by the light-emitting means to the establishment of a predetermined condition, the angle-adjusting means is controlled such that the reflecting means is set to a non-visible position at which the scanning laser beam is reflected inside the case.Type: ApplicationFiled: December 5, 2012Publication date: January 22, 2015Inventors: Yasuhiro Yamakawa, Tsuyoshi Nakahara, Makoto Hada, Shun Sekiya, Kazuyoshi Yamada
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Patent number: 8336259Abstract: A vehicle door opening/closing apparatus includes a drum unit disposed on the side of one face of an inner panel constituting a vehicle door and including a take-up drum capable of taking up a length of cable disposed between the vehicle and the vehicle door, a drive unit disposed on the side of the other face of the inner panel and configured to drive the take-up drum, a power transmission mechanism configured for transmitting a rotational drive force of the drive unit to the take-up drum, with allowing engagement and disengagement between take-up drum and the drive unit, and a coupling mechanism for coupling the drive unit to the drum unit, with the inner panel being clamped there between.Type: GrantFiled: February 26, 2009Date of Patent: December 25, 2012Assignee: Aisin Seiki Kabushiki KaishaInventors: Toshihiko Ishida, Katsuhisa Yamada, Yasuhiro Yamakawa, Tsuyoshi Kamiya, Shinji Kazama
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Publication number: 20100251619Abstract: A vehicle door opening/closing apparatus includes a drum unit disposed on the side of one face of an inner panel constituting a vehicle door and including a take-up drum capable of taking up a length of cable disposed between the vehicle and the vehicle door, a drive unit disposed on the side of the other face of the inner panel and configured to drive the take-up drum, a power transmission mechanism configured for transmitting a rotational drive force of the drive unit to the take-up drum, with allowing engagement and disengagement between take-up drum and the drive unit, and a coupling mechanism for coupling the drive unit to the drum unit, with the inner panel being clamped therebetween.Type: ApplicationFiled: February 26, 2009Publication date: October 7, 2010Applicant: AISIN SEIKI KABUSHIKI KAISHAInventors: Toshihiko Ishida, Katsuhisa Yamada, Yasuhiro Yamakawa, Tsuyoshi Kamiya, Shinji Kazama
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Patent number: 7708334Abstract: A slide door apparatus for a vehicle includes a driving device mounted to a slide door and a guide pulley unit mounted to the slide door. The guide pulley unit includes a plurality of guide pulleys each having first and second guide grooves. The guide pulley unit further includes first and second housing members for housing the plurality of guide pulleys, and a separating member provided between the first and second housing members for separating the first and second guide grooves of each of the plurality of guide pulleys. The slide door apparatus further includes a cable connected to the driving device and to a vehicle body. A first portion of the cable is disposed into the first groove of each of the plurality of guide pulleys. A second portion of the cable is disposed into the second groove of each of the plurality of guide pulleys.Type: GrantFiled: June 2, 2008Date of Patent: May 4, 2010Assignee: Aisin Seiki Kabushiki KaishaInventors: Katsuhisa Yamada, Yasuhiro Yamakawa
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Publication number: 20080302018Abstract: A slide door apparatus for a vehicle includes a driving device mounted to a slide door and a guide pulley unit mounted to the slide door. The guide pulley unit includes a plurality of guide pulleys each having first and second guide grooves. The guide pulley unit further includes first and second housing members for housing the plurality of guide pulleys, and a separating member provided between the first and second housing members for separating the first and second guide grooves of each of the plurality of guide pulleys. The slide door apparatus further includes a cable connected to the driving device and to a vehicle body. A first portion of the cable is disposed into the first groove of each of the plurality of guide pulleys. A second portion of the cable is disposed into the second groove of each of the plurality of guide pulleys.Type: ApplicationFiled: June 2, 2008Publication date: December 11, 2008Applicant: AISIN SEIKI KABUSHIKI KAISHAInventors: Katsuhisa YAMADA, Yasuhiro Yamakawa
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Publication number: 20070237701Abstract: [PROBLEMS] To provide a silica sol and the method of producing the silica sol, wherein the silica sol is suitable for use as a material for, e.g., an abrasive material for electronic materials, silicon wafers or the like which are required to have a high purity, has excellent sol stability, can hence be easily made to have an increased silica concentration, and can be regulated so as to have a silica concentration equal to or higher than that of silica sols produced from water glass. [MEANS FOR SOLVING PROBLEMS] The silica sol comprises water and fine silica particles dispersed therein, and wherein the fine silica particles have a secondary-particle diameter of 10-1,000 nm, a metal impurity content of 1 ppm or lower, and a silica concentration of 10-50 wt. %. Also provided is a process for producing a stable silica sol comprising the following steps (a) and (b). (a) A first step in which a hydrolyzable silicon compound is hydrolyzed and condensation-polymerized to produce a silica sol.Type: ApplicationFiled: January 18, 2005Publication date: October 11, 2007Inventors: Yasuhiro Yamakawa, Yoshiaki Tomoda, Keiji Toyama, Masatoshi Sakai
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Patent number: 6677524Abstract: A grommet apparatus includes wire, a hard grommet having a tubular wall portion contacted with the wire, a base portion contacted with the wire and a flexible engaging portion formed on the tubular wall portion and engaged with an opening, and a soft grommet having a surrounding portion surrounding the hard grommet, a first seal portion extended from the surrounding portion and fluid-tightly contacted with a surface of the panel, a wire fitting portion fitted onto the wire and a second seal portion fitted between the opening and the hard grommet.Type: GrantFiled: October 24, 2002Date of Patent: January 13, 2004Assignee: Aisin Seiki Kabushiki KaishaInventors: Ryoichi Fukumoto, Nobuhiro Yamauchi, Katsuhisa Yamada, Yasuhiro Yamakawa
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Publication number: 20030084538Abstract: A grommet apparatus comprises a wire, a hard grommet having a having a tubular wall portion contacted with the wire, a base portion contacted with the wire and a flexible engaging portion formed on the tubular wall portion and engaged with an opening, and a soft grommet having a surrounding portion surrounding the hard grommet, a first seal portion extended from the surrounding portion and fluid-tightly contacted with a surface of the panel, a wire fitting portion fitted onto the wire and a second seal portion fitted between the opening and the hard grommet.Type: ApplicationFiled: October 24, 2002Publication date: May 8, 2003Inventors: Ryoichi Fukumoto, Nobuhiro Yamauchi, Katsuhisa Yamada, Yasuhiro Yamakawa
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Patent number: 5548162Abstract: An electronic circuit comprising a comparator which is operated by a first power source voltage and having first and second input terminals, where the first input terminal is supplied with a reference voltage which is dependent on the first power source voltage, a detecting circuit for detecting a deviation of a second power source voltage and for outputting a control signal dependent on the deviation, where the first and second power source voltages undergo mutually independent deviations, and a voltage converting circuit supplied with an input signal for converting a voltage of the input signal depending on the control signal received from the detecting circuit. The voltage converting circuit supplies the input signal to the second input terminal of the comparator which outputs an error signal indicative of an error between the input signal voltage and the reference voltage.Type: GrantFiled: February 22, 1995Date of Patent: August 20, 1996Assignees: Fujitsu Limited, Fujitsu VLSI Limited, Fujitsu Ten LimitedInventors: Hidenobu Ito, Katsuya Shimizu, Kenzo Hashikawa, Yasuhiro Yamakawa
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Patent number: 5020877Abstract: A rear projection screen comprises, in combination, a Fresnel lens having concentric annular ridges arranged at a radial pitch of P1, and a lenticular lens having parallel lenticulars arranged at a pitch P2. The pitch ratio P1/P2 between the pitches P1 and P2 is determined in the range of 0.1505 to 0.1545 or in the range of 0.176 to 0.181. The rear projection screen meeting such a condition suppresses effectively the moire effect of the concentric annular ridges of the Fresnel lens and the parallel lenticulars of the lenticular lens disposed adjacent to the Fresnel lens.Type: GrantFiled: April 26, 1990Date of Patent: June 4, 1991Assignee: Pioneer Electronic Corp.Inventors: Toru Yokoo, Takashi Kobane, Akihiko Seki, Yasuhiro Yamakawa, Yoshikazu Kawakami