Patents by Inventor Cheng-Min Chang
Cheng-Min Chang 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: 11962878Abstract: An electronic device is provided, including a main body and a camera module. The camera module has a frame, a lens unit disposed in the frame, a guiding member, and a hinge. The guiding member is affixed to the main body and has a rail and a spring sheet. The hinge pivotally connects to the frame and the guiding member. When the camera module is in the retracted position, the camera module is hidden in a recess of the main body. When the camera module slides out of the recess from the retracted position along the rail into the operational position, the spring sheet is pressed by the hinge to increase the friction between the hinge and the guiding member.Type: GrantFiled: April 27, 2022Date of Patent: April 16, 2024Assignee: ACER INCORPORATEDInventors: Yu-Chin Huang, Cheng-Mao Chang, Li-Hua Hu, Pao-Min Huang
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Publication number: 20230188075Abstract: A voltage measurement device for pulse-width modulation (PWM) signals is provided, which includes a conversion circuit and a processing circuit. The conversion circuit receives a first PWM signal and a second PWM signal from a motor driving device, and converts the first PWM signal and the second PWM signal into the absolute value signal and the polarity signal of the line-to-line voltage signal between the first PWM signal and the second PWM signal. The processing circuit converts the polarity signal and the absolute value signal into a first integral signal and a second integral signal, and reconstructs the line-to-line voltage signal according to the first integral signal and the second integral signal so as to obtain the reconstructed voltage signal of the line-to-line voltage signal.Type: ApplicationFiled: December 13, 2021Publication date: June 15, 2023Inventors: WEN-CHE SHEN, CHENG-MIN CHANG, CHUN-CHIEH CHANG, PO-HUAN CHOU
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Patent number: 11658599Abstract: A voltage measurement device for pulse-width modulation (PWM) signals is provided, which includes a conversion circuit and a processing circuit. The conversion circuit receives a first PWM signal and a second PWM signal from a motor driving device, and converts the first PWM signal and the second PWM signal into the absolute value signal and the polarity signal of the line-to-line voltage signal between the first PWM signal and the second PWM signal. The processing circuit converts the polarity signal and the absolute value signal into a first integral signal and a second integral signal, and reconstructs the line-to-line voltage signal according to the first integral signal and the second integral signal so as to obtain the reconstructed voltage signal of the line-to-line voltage signal.Type: GrantFiled: December 13, 2021Date of Patent: May 23, 2023Assignee: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTEInventors: Wen-Che Shen, Cheng-Min Chang, Chun-Chieh Chang, Po-Huan Chou
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Patent number: 11381157Abstract: A motor drive is provided, which includes a control circuit, a first transistor, a first comparison circuit, a second transistor and a load. The control circuit includes a first output terminal and a second output terminal; the first output terminal outputs a first control signal; the second output terminal outputs a second control signal whose phase is inverse to the phase of the first control signal. The gate of the first transistor receives the first control signal. The first comparison circuit compares the gate-source voltage with a reference voltage to generate a first comparison signal. When the first comparison signal shows that the first control signal is reduced to be lower than the reference voltage, the second control signal generated by the second output terminal is transmitted to the gate of the second transistor.Type: GrantFiled: December 10, 2020Date of Patent: July 5, 2022Assignee: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTEInventors: Cheng-Min Chang, Chun-Chieh Chang, Hsi-Chih Chang, Po-Huan Chou
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Publication number: 20220190711Abstract: A motor driver is provided, which includes a control circuit, a first transistor, a first comparison circuit, a second transistor and a load. The control circuit includes a first output terminal and a second output terminal; the first output terminal outputs a first control signal; the second output terminal outputs a second control signal whose phase is inverse to the phase of the first control signal. The gate of the first transistor receives the first control signal. The first comparison circuit compares the gate-source voltage with a reference voltage to generate a first comparison signal. When the first comparison signal shows that the first control signal is reduced to be lower than the reference voltage, the second control signal generated by the second output terminal is transmitted to the gate of the second transistor.Type: ApplicationFiled: December 10, 2020Publication date: June 16, 2022Inventors: CHENG-MIN CHANG, CHUN-CHIEH CHANG, HSI-CHIH CHANG, PO-HUAN CHOU
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Publication number: 20170047805Abstract: The disclosure provides a stator module and a magnetic field generating structure which includes a magnetizer and an electrically conducting pipe. The electrically conducting pipe is wound around the magnetizer and has a passage inside. The passage has an outlet and an inlet opposite to each other. The electrically conducting pipe has a current input portion and a current output portion.Type: ApplicationFiled: October 24, 2016Publication date: February 16, 2017Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTEInventors: Se-Kang HO, Kuo-Lin CHIU, Chia-Min TING, Cheng-Min CHANG, Chen-Chih LIN, Hsien-Chang HUANG, Yu-Hsun WU
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Patent number: 9515530Abstract: The disclosure provides a stator module and a magnetic field generating structure which includes a magnetizer and an electrically conducting pipe. The electrically conducting pipe is wound around the magnetizer and has a passage inside. The passage has an outlet and an inlet opposite to each other. The electrically conducting pipe has a current input portion and a current output portion.Type: GrantFiled: March 18, 2013Date of Patent: December 6, 2016Assignee: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTEInventors: Se-Kang Ho, Kuo-Lin Chiu, Chia-Min Ting, Cheng-Min Chang, Chen-Chih Lin, Hsien-Chang Huang, Yu-Hsun Wu
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Publication number: 20140139057Abstract: The disclosure provides a stator module and a magnetic field generated structure which includes a magnetizer and an electrically conducting pipe. The electrically conducting pipe is wound around the magnetizer and has a passage inside. The passage has an outlet and an inlet opposite to each other. The electrically conducting pipe has a current input portion and a current output portion.Type: ApplicationFiled: March 18, 2013Publication date: May 22, 2014Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTEInventors: Se-Kang HO, Kuo-Lin CHIU, Chia-Min TING, Cheng-Min CHANG, Chen-Chih LIN, Hsine-Chang HUANG, Yu-Hsun WU
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Patent number: 8283581Abstract: An integral keyboard assembly is provided. The integral keyboard assembly includes a top casing, a keyboard module, and a support plate. The first surface of the top casing is defined a keyboard bonding area where a plurality of openings is arranged as a keyboard structure distribution. The keyboard module includes multiple keys with interspaces formed therebetween. Each of the keys is inserted into a corresponding one of the openings. The support plate is coupled to the top casing so that the keyboard module is sandwiched between the top casing and the support plate. By implementing the present invention, the keyboard assembly has better integrity and space impression. Furthermore, the keyboard module is provided with improved support by utilizing the support plate.Type: GrantFiled: May 25, 2010Date of Patent: October 9, 2012Assignee: Shuttle Inc.Inventors: An-Sheng Weng, Chih-Hsiang Chien, His-Yun Chen, Hsin-Hung Lai, Chun-Te Lee, Cheng-Min Chang, Chai-Wei Shih
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Publication number: 20120075793Abstract: A connection structure having guiding mechanism includes a female connector, a sensing unit and a status-indicating unit arranged on an electronic device, and a male connector, a trigger element and a status-indicating unit arranged a docking station. While the electronic device is close to the docking station, the sensing unit will sense the trigger element and activate the status-indicating unit. Once the status-indicating unit is aligned to the position-marking unit by a user, the female connector will be aligned to the male connector.Type: ApplicationFiled: September 26, 2010Publication date: March 29, 2012Inventors: Chih-Hsiang CHIEN, An-Sheng Weng, His-Yun Chen, Hsin-Hung Lai, Chun-Te Lee, Cheng-Min Chang, Chai-Wei Shih
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Patent number: 8093855Abstract: A low speed control method and an apparatus for a servo motor. The control apparatus comprises: an encoder capable of acquiring a speed signal from a servo motor and encoding the speed signal to output a low-resolution encoded signal; an insertion calculation unit capable of receiving the low-resolution encoded signal from the encoder to be processed by an interpolation operation for converting the low-resolution encoded signal into a high-resolution encoded signal to be outputted therefrom; a servo control chip capable of setting internal parameters and receiving the high-resolution encoded signal from the insertion calculation unit to be processed by a calculation process so as to output a switch control instruction; and a power module capable of receiving the switch control instruction from the servo control chip and then transmitting the same to the servo motor for adjusting the operation speed of the servo motor.Type: GrantFiled: August 5, 2009Date of Patent: January 10, 2012Assignee: Industrial Technology Research InstituteInventors: Chia-Min Ting, Hsin-Hung Chou, Chiu-Pao Tien, Cheng-Min Chang, Ya-Ling Chang
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Publication number: 20110240450Abstract: An integral keyboard assembly is provided. The integral keyboard assembly includes a top casing, a keyboard module, and a support plate. The first surface of the top casing is defined a keyboard bonding area where a plurality of openings is arranged as a keyboard structure distribution. The keyboard module includes multiple keys with interspaces formed therebetween. Each of the keys is inserted into a corresponding one of the openings. The support plate is coupled to the top casing so that the keyboard module is sandwiched between the top casing and the support plate. By implementing the present invention, the keyboard assembly has better integrity and space impression. Furthermore, the keyboard module is provided with improved support by utilizing the support plate.Type: ApplicationFiled: May 25, 2010Publication date: October 6, 2011Applicant: Shuttle Inc.Inventors: An-Sheng Weng, Chih-Hsiang Chien, His-Yun Chen, Hsin-Hung Lai, Chun-Te Lee, Cheng-Min Chang, Chai-Wei Shih
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Publication number: 20100156336Abstract: A low speed control method and an apparatus for a servo motor. The control apparatus comprises: an encoder capable of acquiring a speed signal from a servo motor and encoding the speed signal to output a low-resolution encoded signal; an insertion calculation unit capable of receiving the low-resolution encoded signal from the encoder to be processed by an interpolation operation for converting the low-resolution encoded signal into a high-resolution encoded signal to be outputted therefrom; a servo control chip capable of setting internal parameters and receiving the high-resolution encoded signal from the insertion calculation unit to be processed by a calculation process so as to output a switch control instruction; and a power module capable of receiving the switch control instruction from the servo control chip and then transmitting the same to the servo motor for adjusting the operation speed of the servo motor.Type: ApplicationFiled: August 5, 2009Publication date: June 24, 2010Applicant: Industrial Technology Research InstituteInventors: Chia-Min Ting, Hsin-Hung Chou, Chiu-Pao Tien, Cheng-Min Chang, Ya-Ling Chang
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Publication number: 20090282177Abstract: An apparatus and a method for signal transmission in an embedded system. The apparatus comprises: a master control chip, embedded in the embedded system and comprising a controller and a plurality of I/O pins; a plurality of slave chips; and a bus having one end coupled to the plurality of I/O pins and the other end coupled to one of the plurality of slave chips; wherein data or signals are bi-directionally transmitted. The method comprises steps of: transmitting a control signal from a master control chip to a slave chip; starting an operation by the slave chip after receiving the control signal; transmitting a data signal and a command signal to the master control chip from the slave chip; processing the data signal according to the command signal by the master control chip; and transmitting another control signal from the master control chip to the slave chip to terminate the operation.Type: ApplicationFiled: July 29, 2008Publication date: November 12, 2009Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTEInventors: Ying-Min Chen, Shin-Hung Jou, Chia-Min Ting, Cheng-Min Chang
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Patent number: 6692119Abstract: A mechanism for regulating pressure within the interior of ink cartridge is peculiarized by that a filter which is telescoped by a sleeve is taken as a pressure-regulating member. The sleeve is telescoped with one end of a conduit and is communicable with the external atmosphere of the ink cartridge. By using the filter comprising uniformly arranged fiber bundles, a capillary action is created on the filter so that the back pressure can be maintained and the air can be introduced into the ink cartridge through the conduit. The negative pressure of the ink cartridge can be maintained at a best equilibrium state and the ink cartridge can be kept at an optimum condition.Type: GrantFiled: May 7, 2002Date of Patent: February 17, 2004Assignee: Microjet Technology, Co., Ltd.Inventors: Rong-Ho Yu, Cheng-Min Chang
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Patent number: 6692120Abstract: A pressure regulation apparatus for an ink reservoir is provided. The apparatus includes: an elastic bag mounted in the ink reservoir for freely passing an ambient air of an ambient environment outside the ink reservoir in and out the elastic bag, wherein the ink reservoir has an interior for holding an ink, and a porous filter mounted in the ink reservoir for entering the ambient air outside the ink reservoir into the interior of the ink reservoir therethrough, thereby the elastic bag and the porous filter complementarily regulating a pressure difference between the interior of the ink reservoir and the ambient environment outside the ink reservoir. By this apparatus, the pressure change within the ink reservoir is able to respond immediately for a big pressure change by the elastic bag and to regulate sensitively for a slight pressure change by the porous filter.Type: GrantFiled: May 8, 2002Date of Patent: February 17, 2004Assignee: Microjet Technology Co., Ltd.Inventors: Rong-Ho Yu, Cheng-Min Chang
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Publication number: 20030043242Abstract: A pressure regulation apparatus for an ink reservoir is provided. The apparatus includes: an elastic bag mounted in the ink reservoir for freely passing an ambient air of an ambient environment outside the ink reservoir in and out the elastic bag, wherein the ink reservoir has an interior for holding an ink, and a porous filter mounted in the ink reservoir for entering the ambient air outside the ink reservoir into the interior of the ink reservoir therethrough, thereby the elastic bag and the porous filter complementarily regulating a pressure difference between the interior of the ink reservoir and the ambient environment outside the ink reservoir. By this apparatus, the pressure change within the ink reservoir is able to respond immediately for a big pressure change by the elastic bag and to regulate sensitively for a slight pressure change by the porous filter.Type: ApplicationFiled: May 8, 2002Publication date: March 6, 2003Applicant: Microjet Technology Co., Ltd.Inventors: Rong-Ho Yu, Cheng-Min Chang
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Patent number: D535326Type: GrantFiled: March 24, 2005Date of Patent: January 16, 2007Assignee: Microjet Technology Co., Ltd.Inventor: Cheng-Min Chang
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Patent number: D538335Type: GrantFiled: March 24, 2005Date of Patent: March 13, 2007Assignee: Microjet Technology Co., Ltd.Inventor: Cheng-Min Chang
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Patent number: D477021Type: GrantFiled: September 18, 2002Date of Patent: July 8, 2003Assignee: Microjet Technology Co., Ltd.Inventors: Rong-Ho Yu, Cheng-Min Chang