Patents by Inventor Takeshi Takizawa
Takeshi Takizawa 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).
-
Patent number: 6976760Abstract: The invention provides a projector that is capable of efficiently cooling an outer case along with a light source device. The projector includes an outer case that accommodates a light source device and a cooling passage that is formed in the vicinity of the light source device to cool the outer case. Therefore, the inside of the outer case and the vicinity of the light source device are cooled by the cooling passage so as to cool the outer case efficiently. Also, since the cooling passage is arranged in the vicinity of the light source device, the light source device can also efficiently be cooled. As a result, a temperature rise in the light source device can be restrained so as to cool the outer case more efficiently.Type: GrantFiled: December 4, 2001Date of Patent: December 20, 2005Assignee: Seiko Epson CorporationInventors: Shinsuke Ito, Takeshi Takizawa
-
Publication number: 20050259903Abstract: A rolling bearing with sensor includes an inner ring, an outer ring, a plurality of rolling elements disposed between the inner and outer rings, and a sensor having a detecting part detecting a state of the rolling bearing and a circuit part connected to the detecting part. The detecting part and the circuit part are attached to the rolling bearing.Type: ApplicationFiled: July 29, 2005Publication date: November 24, 2005Inventors: Takeshi Takizawa, Shigeru Endo, Kouichi Morita, Yoshio Shoda, Hiromasa Fukuyama, Toshio Takahashi
-
Patent number: 6948856Abstract: A rolling bearing with sensor includes an inner ring, an outer ring, a plurality of rolling elements disposed between the inner and outer rings, and a sensor having a detecting part detecting a state of the rolling bearing and a circuit part connected to the detecting part. The detecting part and the circuit part are attached to the rolling bearing.Type: GrantFiled: November 6, 2001Date of Patent: September 27, 2005Assignee: NSK Ltd.Inventors: Takeshi Takizawa, Shigeru Endo, Kouichi Morita, Yoshio Shoda, Hiromasa Fukuyama, Toshio Takahashi
-
Publication number: 20050140357Abstract: A sensor unit is supported on a stationary ring which does not rotate even when it is in use, and the rotation of the rotary ring can be detected by a rotation detecting sensor held within the sensor unit. Within the sensor unit, besides the rotation detecting sensor, there are disposed other sensors such as a temperature sensor and a vibration sensor, thereby being able to detect the rotation speed and the rotation number of the wheel supported on the rotary ring, and the other car driving conditions.Type: ApplicationFiled: February 17, 2005Publication date: June 30, 2005Inventors: Takeshi Takizawa, Shigeru Endo, Ikunori Sakatani, Tatsunobu Momono, Yasushi Mutoh
-
Patent number: 6894484Abstract: A wheel rotation detecting device including a sensor unit that is supported on a stationary ring which does not rotate even when the wheel is in use, and the rotation of the wheel that is attached to a rotary ring can be detected by a rotation detecting sensor held within the sensor unit. Within the sensor unit, in addition to a rotation detecting sensor, there are disposed other sensors such as a temperature sensor and a vibration sensor, thereby allowing detection of the rotation speed and the rotation number of the wheel supported on the rotary ring, as well as detection of other car driving conditions.Type: GrantFiled: January 24, 2002Date of Patent: May 17, 2005Assignee: NSK Ltd.Inventors: Takeshi Takizawa, Shigeru Endo, Ikunori Sakatani, Tatsunobu Momono, Yasushi Mutoh
-
Patent number: 6866389Abstract: An optical device (44) has a holding frame (446) that holds a liquid crystal panel (441) as an optical modulator and has an opening (446C) at a part corresponding to an image formation area of the liquid crystal panel (441), and a panel fixing plate (447) disposed between the holding frame (446) and a cross dichroic prism (444). The panel fixing plate (447) is made of a component having a thermal expansion coefficient lying midway between the thermal expansion coefficients of the holding frame (446) and the cross dichroic prism (444). The liquid crystal panel (441) is fixed on a side of the cross dichroic prism (444) through the holding frame (446) and the panel fixing plate (447). Accordingly, a thermal stress generated on the boundaries between the panel fixing plate (447), and the holding frame (446) and the cross dichroic prism (444) are reduced, thereby preventing the position shift of the liquid crystal panel (441).Type: GrantFiled: October 10, 2003Date of Patent: March 15, 2005Assignee: Seiko Epson CorporationInventors: Shinsuke Ito, Takeshi Takizawa
-
Publication number: 20040184166Abstract: In a lens driver apparatus using a linear actuator, spaces for installing a driving coil and a driving magnet are reduced to contribute to making the lens driver apparatus smaller. The present invention relates to the lens driver apparatus including a body that is to be driven and to which a lens is attached, a guide axis to guide and allow the body to be driven to move freely in a direction of the optical axis, a driving coil being flat-wound and fitted to the body to be driven, and a driving magnet being disposed opposite side of the driving coil and along a direction of movement of the body to be driven. In the lens driver apparatus according to the present invention, the driving coil and the driving magnet are shaped in curved forms so as to conform to an outer shape of the lens.Type: ApplicationFiled: December 3, 2003Publication date: September 23, 2004Inventors: Takeshi Takizawa, Shinichi Orimo
-
Publication number: 20040165152Abstract: An optical device (44) has a holding frame (446) that holds a liquid crystal panel (441) as an optical modulator and has an opening (446C) at a part corresponding to an image formation area of the liquid crystal panel (441), and a panel fixing plate (447) disposed between the holding frame (446) and a cross dichroic prism (444). The panel fixing plate (447) is made of a component having a thermal expansion coefficient lying midway between the thermal expansion coefficients of the holding frame (446) and the cross dichroic prism (444). The liquid crystal panel (441) is fixed on a side of the cross dichroic prism (444) through the holding frame (446) and the panel fixing plate (447). Accordingly, a thermal stress generated on the boundaries between the panel fixing plate (447), and the holding frame (446) and the cross dichroic prism (444) are reduced, thereby preventing the position shift of the liquid crystal panel (441).Type: ApplicationFiled: October 10, 2003Publication date: August 26, 2004Applicant: SEIKO EPSON CORPORATIONInventors: Shinsuke Ito, Takeshi Takizawa
-
Patent number: 6702444Abstract: This invention concerns reducing fan noise and preventing a light source, an optical element, and the like from deteriorating in a projector display device. The projection display device includes a light-source lamp unit, an optical system unit having a modulation device, a projection lens for enlarging and projecting an image formed by the optical system, a power supply unit for supplying electric power for driving the device, power supply intake fans, a modulation device intake fan, and exhaust fans. Fan noise can be reduced by driving only the power supply intake fans for a predetermined period after the device is powered on. Furthermore, the light-source lamp, the optical elements, and the like can be prevented from deteriorating by controlling the rotation speeds of the other fans based on detected temperatures detected by temperature sensors.Type: GrantFiled: June 27, 2002Date of Patent: March 9, 2004Assignee: Seiko Epson CorporationInventors: Takeshi Takizawa, Hideoki Miyake
-
Publication number: 20040036621Abstract: A rolling bearing apparatus with sensor includes a sensor unit retaining a plurality of types of sensors for detecting the status of a rolling bearing, in a single holder. The plurality of types of sensors are at least two types of sensors of a rotation speed sensor, a temperature sensor, and an acceleration sensor.Type: ApplicationFiled: August 20, 2003Publication date: February 26, 2004Applicant: NSK LTD.Inventors: Kouichi Morita, Hiromasa Fukuyama, Ikunori Sakatani, Takeshi Takizawa, Shigeru Endo, Toshio Takahashi
-
Patent number: 6695483Abstract: A rolling bearing apparatus with sensor includes a sensor unit retaining a plurality of types of sensors for detecting the status of a rolling bearing, in a single holder. The plurality of types of sensors are at least two types of sensors of a rotation speed sensor, a temperature sensor, and an acceleration sensor.Type: GrantFiled: November 30, 2001Date of Patent: February 24, 2004Assignee: NSK Ltd.Inventors: Ikunori Sakatani, Takeshi Takizawa, Shigeru Endo
-
Patent number: 6657680Abstract: The invention provides an optical component and a projector in which a light modulation device is reliably fixed relative to a prism, and in which the size of the prism can be reduced to the minimum size required from an optical point of view. Frame members are attached to a cross-dichroic prism, and retaining frames, which retain liquid crystal panels, are fixed to the frame members with fixing pins. Since it is not necessary to fix the fixing pins directly to the cross-dichroic prism, the cross-dichroic prism, having the minimum size required from an optical point of view, may be used. In addition, since a large fixing area is provided between the frame members and the fixing pins, the frame members and the fixing pins are fixed to each other with sufficient fixation strength. Accordingly, the liquid crystal panels may be reliably fixed relative to the cross-dichroic prism.Type: GrantFiled: July 6, 2001Date of Patent: December 2, 2003Assignee: Seiko Epson CorporationInventor: Takeshi Takizawa
-
Patent number: 6637895Abstract: In a projection display provided with an optical unit, a power source unit, an external case to store the optical unit and the power source unit, a suction opening (75) is formed in one end part of the power source unit, a discharge opening (77) is formed in the other end part, and the suction opening (75) is arranged in the vicinity of an air inlet in the external case. Because the suction opening (75) and the discharge opening (77) are provided, the inside of the power source unit can be independently and efficiently cooled, and the optical unit and the power source unit can be arranged closely to each other.Type: GrantFiled: October 26, 2001Date of Patent: October 28, 2003Assignee: Seiko Epson CorporationInventors: Motoyuki Fujimori, Akitoshi Kuroda, Shinji Haba, Kiyoshi Miyashita, Takeshi Takizawa, Mutsuya Furuhata
-
Publication number: 20030133078Abstract: The present invention provides a technique for readily changing the design of a projector. A projector comprises: an illumination optical system; a light modulation device; a projection optical system; and a base frame for mounting a plurality of optical components disposed on a light path from the optical illumination system to the projection optical system. The illumination optical system 300 comprises: a light source 20; a lens array 320; and a superimposing lens system 370. The base frame includes a positioning section for positioning the superimposing lens system 370. The superimposing lens system 370 includes at least two lenses 371 and 372. The first lens 371 is provided at a position nearest to the light source and mainly determines an F-number of the illumination optical system. The second lens 372 is provided at a position furthest from the light source and mainly determines a magnification of the illumination optical system.Type: ApplicationFiled: February 5, 2003Publication date: July 17, 2003Inventors: Hisashi Iechika, Takeshi Takizawa
-
Publication number: 20030091253Abstract: A rolling bearing apparatus with sensor includes a sensor unit retaining a plurality of types of sensors for detecting the status of a rolling bearing, in a single holder. The plurality of types of sensors are at least two types of sensors of a rotation speed sensor, a temperature sensor, and an acceleration sensor.Type: ApplicationFiled: November 30, 2001Publication date: May 15, 2003Applicant: NSK LTD.Inventors: Kouichi Morita, Hiromasa Fukuyama, Ikunori Sakatani, Takeshi Takizawa, Shigeru Endo, Toshio Takahashi
-
Patent number: 6561650Abstract: The invention provides a polarization-converting unit capable of being sufficiently cooled even when polarization-converting elements and a lens array are unitized together. Polarization-converting elements and a second lens array are held by a holding frame and a flow-inlet-side opening is arranged under the holding frame, and a flow-outlet-side opening is arranged over the holding frame so as to form a polarization-converting unit. Therefore, cooling air can be allowed to vertically flow through a clearance between the polarization-converting elements and the second lens array, thereby sufficiently cooling the polarization-converting elements and the second lens array from the faces thereof opposing each other. Therefore, in particular, the thermal effect to phase-difference plates pasted to the opposing faces of the polarization-converting elements can be reduced, and thereby the phase-difference plates are prevented from being peeled off so as to maintain the sufficient image quality.Type: GrantFiled: July 6, 2001Date of Patent: May 13, 2003Assignee: Seiko Epson CorporationInventors: Shinsuke Ito, Takeshi Takizawa
-
Patent number: 6558004Abstract: The invention provides a projector capable of cooling a light-source lamp efficiently and suppressing noises as well. In a first cooling system, the base side of a light-source lamp, which reaches a high temperature, is intensively cooled by a first sirocco fan. An axial-flow exhaust fan is provided close to the light-source lamp so that cooling air is allowed to quickly flow while cooling the light-source lamp. Therefore, even when the first sirocco fan, in which the air pressure of cooling air is liable to be reduced, is used, heat generated in the light-source lamp can be smoothly radiated, thereby efficiently cooling the light-source lamp. Since the first sirocco fan is remarkably quiet as compared to an axial-flow fan, noises are suppressed to a low level.Type: GrantFiled: July 6, 2001Date of Patent: May 6, 2003Assignee: Seiko Epson CorporationInventors: Shinsuke Ito, Takeshi Takizawa
-
Patent number: 6556256Abstract: A projector of the type which uses an optical modulator that modulates light by controlling the emitting direction of light applied to a light illumination surface in accordance with image information is provided with a reduction in size. In the projector a prism has a selective reflection/transmission surface which reflects illumination light emitted from an illumination optical system and impinging thereupon, and causes the illumination light to impinge upon the light illumination surface of an optical modulator at a predetermined angle. The prism allows the modulated light emitted from the optical modulator to be transmitted therethrough and emits the light to the projection optical system.Type: GrantFiled: March 1, 2000Date of Patent: April 29, 2003Assignee: Seiko Epson CorporationInventors: Hisamaro Kato, Kazuhiro Nishida, Tomiyoshi Ushiyama, Takeshi Takizawa
-
Patent number: 6540364Abstract: The invention provides a projector capable of reducing costs and promoting miniaturization while also being dust-proof. A second sirocco fan with an air-inlet opposing a projection lens is used, and an air-inlet of an outer case is formed on a side face thereof. Thereby, it is difficult for dust to be sucked therein compared with an air-inlet formed on the bottom or top face of the outer case, enabling the projector to be dust-proof without any filter. Since the filter is not required, the number of parts is reduced, thereby reducing costs. Furthermore, the second sirocco fan is placed by utilizing a space under the projection lens, which is liable to be a dead space, enabling the arrangement space to be efficiently used thereby promoting miniaturization of a projector.Type: GrantFiled: June 12, 2001Date of Patent: April 1, 2003Assignee: Seiko Epson CorporationInventors: Takeshi Takizawa, Shinsuke Ito
-
Patent number: 6530665Abstract: A projector prevents deterioration in optical characteristics of liquid crystal panels caused by heat generated by polarizers, and sticking of dirt onto the light-outgoing surface of the liquid crystal panels. Polarizers are disposed adjacent to the light-outgoing surfaces of liquid crystal panels, while other polarizers are disposed adjacent to the light-incoming surfaces of the liquid crystal panels. The liquid crystal panels and the two polarizers disposed adjacent to the light-incoming and light-outgoing surface of their corresponding liquid crystal panels, are supported by dust protection members. The area between the light-incoming surface of each liquid crystal panel and its associated polarizer disposed adjacent to the light-incoming surface, and the area between the light-outgoing surface of each liquid crystal panel and its associated polarizer disposed adjacent to the light-outgoing surface thereof are cut off from the outside by the dust protection member associated thereto.Type: GrantFiled: August 17, 1999Date of Patent: March 11, 2003Assignee: Seiko Epson CorporationInventors: Takeshi Takizawa, Mutsuya Furuhata