Patents by Inventor Kazunari Fujii
Kazunari Fujii 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: 20110019252Abstract: An oscillator device includes a supporting member, an oscillation system having plural oscillators and plural torsion springs, a driving device for oscillating the oscillation system, a drive control device for controlling the driving device, an oscillation detecting device for detecting a state of oscillation of an oscillator of the oscillation system, a resonance frequency calculating device for calculating a resonance frequency of the oscillation system based on an output of the oscillation detecting device, and a control parameter adjusting device for adjusting a control parameter of the drive control device, wherein the control parameter adjusting device adjusts a control parameter based on an output of the resonance frequency calculating device.Type: ApplicationFiled: September 1, 2008Publication date: January 27, 2011Applicant: CANON KABUSHIKI KAISHAInventors: Kazunari Fujii, Suguru Miyagawa
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Patent number: 7855819Abstract: A swing member device comprises a swingable part supported by a supporting part to be swingable around a torsional axis on a supporting base in at least one intrinsic oscillation mode: the swing member device having a temperature-raising unit for raising the temperature of ambient atmosphere in the region of swing motion of the swingable part, the temperature-raising unit raising the temperature of the ambient atmosphere to enable decrease of an influence of an unsteady dragging force caused by the ambient atmosphere.Type: GrantFiled: August 26, 2008Date of Patent: December 21, 2010Assignee: Canon Kabushiki KaishaInventors: Takahisa Kato, Takahiro Akiyama, Kazutoshi Torashima, Suguru Miyagawa, Kazunari Fujii, Shinichiro Watanabe
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Publication number: 20100300208Abstract: A capacitive electro-mechanical transducer includes a cell, the cell including a first electrode and a second electrode that is disposed opposite the first electrode with a gap therebetween; and a pressure-adjusting unit for adjusting pressure in the gap.Type: ApplicationFiled: May 24, 2010Publication date: December 2, 2010Applicant: CANON KABUSHIKI KAISHAInventors: Kazunari Fujii, Yoshitaka Zaitsu
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Patent number: 7843618Abstract: Even in an image-forming apparatus including an optical deflection apparatus using a light source such as a high-power laser light source, a variation in temperature of an optical deflector due to modulation of deflected light based on drawing data is compensated to maintain a preferable oscillation state of the optical deflection apparatus. The optical deflection apparatus includes an optical deflector in which an oscillator is supported by an elastic support member to be oscillatable about a support substrate and at least one light source, and the optical deflection apparatus is controlled such that total power of light emitted from the light source to the optical deflector within each of a plurality of divided time regions corresponding to specific times of equal lengths becomes a predetermined power.Type: GrantFiled: June 14, 2005Date of Patent: November 30, 2010Assignee: Canon Kabushiki KaishaInventors: Kazunari Fujii, Yasuhiro Shimada
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Publication number: 20100271680Abstract: An oscillator device includes an oscillation system having a first oscillator, a second oscillator, a first resilient supporting member and a second resilient supporting member, wherein the oscillation system has at least two frequencies of natural oscillation mode around the torsion axis which include a first resonance frequency f1 and a second resonance frequency f2, wherein there is a relationship that f2 is approximately two-fold of f1, wherein ?f which is expressed as ?f=f2?f×f1 has a relationship of ?f<0, and wherein the drive control means supplies, to the driving means, a driving signal which is comprised of a driving signal based on synthesizing a first driving signal having a first driving frequency and a second driving signal having a second driving frequency, and which is such driving signal that, when a lower-frequency side driving frequency among the first and second driving frequencies is denoted by Df1 and a higher-frequency side driving frequency is denoted by Df2, it satisfies relationshiType: ApplicationFiled: March 12, 2009Publication date: October 28, 2010Applicant: CANON KABUSHIKI KAISHAInventors: Kazunari Fujii, Hideta Nishizawa, Kazufumi Onuma
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Publication number: 20100259809Abstract: An oscillator device includes an oscillation system having first and second oscillators and first and second resilient supporting members, wherein the oscillation system has at least two frequencies of natural oscillation mode around a torsion axis which include a first resonance frequency f1 and a second resonance frequency f2, wherein there is a relationship that f2 is approximately two-fold of f1, and wherein a drive control member supplies, to a driving member, a driving signal which is comprised of a driving signal based on synthesizing a first driving signal having a first driving frequency and a second driving signal having a second driving frequency, and which is such driving signal that, among the first and second driving frequencies, a lower-frequency side driving frequency Df1 and a higher-frequency side driving frequency Df2 satisfy a relationship Df1×2=Df2 and that Df2 satisfies a relationship f2?|?f/2|<Df2<f2+|?f/2|.Type: ApplicationFiled: March 12, 2008Publication date: October 14, 2010Applicant: CANON KABUSHIKI KAISHAInventors: Kazunari Fujii, Hideta Nishizawa, Kazufumi Onuma
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Patent number: 7809032Abstract: A DBR semiconductor laser is controlled in an image projecting apparatus, which includes the DBR laser having a phase and DBR region, a light wavelength converting device for converting fundamental-wave light emitted from the DBR laser into second harmonic wave light, an optical deflector for scanning the second harmonic wave in a one or two-dimensional manner, and a modulating portion for modulating the DBR laser. Coefficient calculating and wavelength adjusting steps are performed within a non-drawing time. The coefficient calculating step calculates at least one coefficient in a relationship between a DBR current to be injected into the DBR region and a phase current to be injected into the phase region for continuously shifting the wavelength of the fundamental-wave light. The wavelength adjusting step changes DBR current injected into the DBR region and phase current injected into the phase region based on the relationship.Type: GrantFiled: January 30, 2009Date of Patent: October 5, 2010Assignee: Canon Kabushiki KaishaInventors: Kazunari Fujii, Hajime Sakata, Yukio Furukawa
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Publication number: 20100214636Abstract: A method of manufacturing an oscillator device having a fixed member and an oscillation plate supported by the fixed member through a supporting member for oscillation around a torsion axis, the oscillation plate being driven at a resonance frequency around the torsion axis, includes a frequency regulating step based on an extension member for adjustment of a mass of the oscillation plate, for forming the extension member on the oscillation plate and for adjusting the mass of the oscillation plate by cutting a portion of the extension member with the irradiation of a laser beam, an oscillator assembling step for fixing the fixed member to a fixed base, and a driving member assembling step for fixing a driving member for driving the oscillation plate to the fixed base, wherein at least the driving member assembling step is carried out after the frequency regulating step based on the extension member is performed.Type: ApplicationFiled: December 10, 2008Publication date: August 26, 2010Applicant: CANON KABUSHIKI KAISHAInventors: Suguru Miyagawa, Kazunari Fujii, Takahisa Kato, Kazutoshi Torashima, Takahiro Akiyama
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Publication number: 20100118370Abstract: An oscillating body apparatus comprises an oscillating plate oscillatably supported around a torsion axis by a support portion for a fixing portion and driving the oscillating plate around the torsion axis by a resonance frequency, the oscillating plate having a region forming a groove portion for adjusting a mass of the oscillating plate, and, the resonance frequency being configured to be adjustable by the formation of the groove portion in the region.Type: ApplicationFiled: August 20, 2008Publication date: May 13, 2010Applicant: CANON KABUSHIKI KAISHAInventors: Kazunari Fujii, Yoshio Hotta, Takahisa Kato, Hiroyuki Morimoto
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Publication number: 20100092213Abstract: An oscillator device includes an oscillation system, a driving member and a control device, wherein the oscillation system includes a first oscillation movable element, a second oscillation movable element and a support member, the first oscillation movable element being supported by a first elastic supporting element, for torsional oscillation relative to the second oscillation movable element and around an oscillation axis, the second oscillation movable element being supported by a second elastic supporting element, for torsional oscillation relative to the support member and around the oscillation axis, wherein the oscillation system has a first natural oscillation mode of a resonance frequency f1 and a second natural oscillation mode of a resonance frequency of f2 which is approximately N-fold of f1 where N is a natural number, and wherein the control device determines set driving frequencies Df1 and Df2 in accordance with a predetermined equation while satisfying a relation Df2=N×Df1 and drives the oType: ApplicationFiled: March 24, 2008Publication date: April 15, 2010Applicant: CANON KABUSHIKI KAISHAInventors: Kazunari Fujii, Takahiro Akiyama
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Publication number: 20100085618Abstract: An oscillator device including an oscillation system with oscillators and torsion springs, a driving member for driving the oscillation system, and a drive control member for supplying a driving signal to the driving member, the oscillation system having at least a first oscillation mode and a second oscillation mode, the second oscillation mode having an angular frequency approximately n-fold the angular frequency of the first oscillation mode where n is an integer, the driving member driving the oscillation system so that it simultaneously oscillates in the first and second oscillation modes, wherein a natural angular frequency calculating member calculates the natural angular frequency of the second oscillation mode based on an output signal from a photodetector, being outputted at a timing whereat the reflection light passes over the photodetector.Type: ApplicationFiled: June 16, 2008Publication date: April 8, 2010Applicant: CANON KABUSHIKI KAISHAInventors: Kazunari Fujii, Suguru Miyagawa
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Publication number: 20100007933Abstract: An apparatus includes an oscillatory system having first and second movable bodies, and first and second elastic support portions, a driving portion having a permanent magnet, and a drive controlling portion. The oscillatory system has at least two characteristic oscillation modes of first and second resonance frequencies. The drive controlling portion supplies a driving signal to the driving portion so that the movable body of the oscillatory system is swingingly rotated. The swinging rotation is performed such that a sum of time periods wherein the angular displacement of the movable body changes in one direction is different from a sum changes in its opposite direction. The drive controlling portion includes a waveform adjusting portion for adjusting the driving signal.Type: ApplicationFiled: July 7, 2009Publication date: January 14, 2010Applicant: CANON KABUSHIKI KAISHAInventors: Kazunari Fujii, Takahiro Akiyama
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Publication number: 20090213886Abstract: A DBR semiconductor laser is controlled in an image projecting apparatus, which includes the DBR laser having a phase and DBR region, a light wavelength converting device for converting fundamental-wave light emitted from the DBR laser into second harmonic wave light, an optical deflector for scanning the second harmonic wave in a one or two-dimensional manner, and a modulating portion for modulating the DBR laser. Coefficient calculating and wavelength adjusting steps are performed within a non-drawing time. The coefficient calculating step calculates at least one coefficient in a relationship between a DBR current to be injected into the DBR region and a phase current to be injected into the phase region for continuously shifting the wavelength of the fundamental-wave light. The wavelength adjusting step changes DBR current injected into the DBR region and phase current injected into the phase region based on the relationship.Type: ApplicationFiled: January 30, 2009Publication date: August 27, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Kazunari Fujii, Hajime Sakata, Yukio Furukawa
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Patent number: 7512160Abstract: A DBR semiconductor laser is controlled in an image projecting apparatus, which includes the DBR laser having a phase and DBR region, a light wavelength converting device for converting fundamental-wave light emitted from the DBR laser into second harmonic wave light, an optical deflector for scanning the second harmonic wave in a one or two-dimensional manner, and a modulating portion for modulating the DBR laser. Coefficient calculating and wavelength adjusting steps are performed within a non-drawing time. The coefficient calculating step calculates at least one coefficient in a relationship between a DBR current to be injected into the DBR region and a phase current to be injected into the phase region for continuously shifting the wavelength of the fundamental-wave light. The wavelength adjusting step changes DBR current injected into the DBR region and phase current injected into the phase region based on the relationship.Type: GrantFiled: August 30, 2007Date of Patent: March 31, 2009Assignee: Canon Kabushiki KaishaInventors: Kazunari Fujii, Hajime Sakata, Yukio Furukawa
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Publication number: 20090067019Abstract: A swing member device comprises a swingable part supported by a supporting part to be swingable around a torsional axis on a supporting base in at least one intrinsic oscillation mode: the swing member device having a temperature-raising unit for raising the temperature of ambient atmosphere in the region of swing motion of the swingable part, the temperature-raising unit raising the temperature of the ambient atmosphere to enable decrease of an influence of an unsteady dragging force caused by the ambient atmosphere.Type: ApplicationFiled: August 26, 2008Publication date: March 12, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Takahisa Kato, Takahiro Akiyama, Kazutoshi Torashima, Suguru Miyagawa, Kazunari Fujii, Shinichiro Watanabe
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Publication number: 20090051992Abstract: Disclosed is an oscillator device that includes an oscillating system having a first oscillator, a second oscillator, a first torsion spring for connecting the first and second oscillators each other, and a second torsion spring being connected to the second oscillator and having a common torsional axis with the first torsion spring; a supporting system for supporting the oscillating system; a driving system for driving the oscillating system so that at least one of the first and second oscillators produces oscillation as can be expressed by an equation that contains a sum of a plurality of time functions; a signal producing system for producing an output signal corresponding to displacement of at least one of the first and second oscillators; and a drive control system for controlling the driving system on the basis of the output signal of the signal producing system so that at least one of amplitude and phase of the time function takes a predetermined value.Type: ApplicationFiled: February 13, 2007Publication date: February 26, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Kazunari Fujii, Yukio Furukawa, Takahiro Akiyama, Ryuhei Shoji, Soichiro Suzuki, Shimpei Matsuo, Tatsuya Hotogi, Shinichiro Iimura
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Publication number: 20080316560Abstract: The optical deflector includes a deflector, a vibration detector, a driving signal generator, a modulation timing signal generator, and a deflection detector. The deflector has a vibrational system having a movable body with a light deflecting member, and deflects light from a light source by the movable body. The vibration detector detects the vibration condition of the vibrational system of the deflector. The driving signal generator generates a driving signal for driving the vibrational system of the deflector. The modulation timing signal generator generates a modulation timing signal as the reference time for regulating the amount of light from the light source. The deflection detector detects the deflection condition of light deflected by the deflector.Type: ApplicationFiled: June 12, 2008Publication date: December 25, 2008Applicant: CANON KABUSHIKI KAISHAInventors: Atsushi Kandori, Masao Majima, Kazunari Fujii
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Publication number: 20080297869Abstract: An oscillator device includes an oscillation system having at least one oscillator configured to oscillate, the oscillation system having a plurality of natural oscillation modes with a plurality of frequencies which frequencies are mutually in a relationship of integral-number ratio, a driving system configured to drive the at least one oscillation system, and a drive control system configured to control the driving system, wherein the drive control system applies to the driving system a driving signal in the form of a rectangular pulse based on combining a plurality of rectangular pulse signals corresponding to the plurality of natural oscillation modes, respectively.Type: ApplicationFiled: June 4, 2008Publication date: December 4, 2008Applicant: CANON KABUSHIKI KAISHAInventors: Takahiro Akiyama, Kazunari Fujii, Yukio Furukawa
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Patent number: 7446921Abstract: An image forming apparatus detects a oscillating state of a oscillation system with a oscillation detector and controls oscillation of the oscillation system such that the oscillation system oscillates a reflective member in a balanced steady state by adjusting a drive force of a drive unit with one or more drive control parameter values on the basis of the detection result obtained by the oscillation detector. When the balanced steady state is detected, the drive control parameter values are stored and are used when an exposure unit is reactivated.Type: GrantFiled: November 1, 2007Date of Patent: November 4, 2008Assignee: Canon Kabushiki KaishaInventors: Souichirou Suzuki, Kenjiro Hori, Shimpei Matsuo, Ryuhei Shoji, Tatsuya Hotogi, Kazunari Fujii
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Patent number: 7411992Abstract: A light wavelength converting apparatus includes a semiconductor laser having gain, phase, and DBR regions, a nonlinear optical device for receiving fundamental-wave light emitted from the semiconductor laser and outputting second harmonic wave light, a first optical detector for monitoring output of the fundamental-wave light, a second optical detector for monitoring the second harmonic wave light, and a control portion for controlling a drive current for driving the semiconductor laser. The control portion includes a control parameter determiner and wavelength controller. The control parameter determiner changes a DBR current supplied to the DBR region and a phase current supplied to the phase region to obtain a changing point, and determines a control parameter for controlling the DBR and phase currents such that the relationship therebetween is not located on the changing point. The wavelength controller controls the DBR and phase currents pursuant to the control parameter.Type: GrantFiled: May 4, 2005Date of Patent: August 12, 2008Assignee: Canon Kabushiki KaishaInventors: Yukio Furukawa, Hajime Sakata, Kazunari Fujii