Patents by Inventor Chao-Min Yang
Chao-Min Yang 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: 20240146205Abstract: A flyback power converter includes a power transformer, a first lossless voltage conversion circuit, a first low-dropout linear regulator and a secondary side power supply circuit. The first low-dropout linear regulator (LDO) generates a first operation voltage as power supply for being supplied to a sub-operation circuit. The secondary side power supply circuit includes a second lossless voltage conversion circuit and a second LDO. The second LDO generates a second operation voltage. The first operation voltage and the second operation voltage are shunted to a common node. When a first lossless conversion voltage is greater than a first threshold voltage, the second LDO is enabled to generate the second operation voltage to replace the first operation voltage as power supply supplied to the sub-operation circuit; wherein the second lossless conversion voltage is lower than the first lossless switching voltage.Type: ApplicationFiled: September 23, 2023Publication date: May 2, 2024Inventors: Shin-Li Lin, He-Yi Shu, Shih-Jen Yang, Ta-Yung Yang, Yi-Min Shiu, Chih-Ching Lee, Yu-Chieh Hsieh, Chao-Chi Chen
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Patent number: 11142415Abstract: A sheet size detecting mechanism includes a sheet guiding module, a sensing module and a control unit. The sensing module includes a contact element and a circuit board. The circuit board includes a first conducting part, a second conducting part and plural fixed resistors. The first conducting part includes plural conductive segments. The plural conductive segments are connected with the corresponding fixed resistors, respectively. While the sheet guiding module is moved relative to the sheet input tray, the contact element is moved with the sheet guiding module. When the electric connection between a first conductive segment and the second conducting part is established through the contact element, the corresponding fixed resistor provides a resistance value, and the circuit board issues a sensing signal according to the resistance value. The control unit acquires the size of the paper sheet according to the sensing signal.Type: GrantFiled: January 7, 2020Date of Patent: October 12, 2021Assignee: PRIMAX ELECTRONICS LTD.Inventors: Chih-Chia Lee, Chun-Chi Wang, Chao-Min Yang
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Publication number: 20210155429Abstract: A sheet size detecting mechanism includes a sheet guiding module, a sensing module and a control unit. The sensing module includes a contact element and a circuit board. The circuit board includes a first conducting part, a second conducting part and plural fixed resistors. The first conducting part includes plural conductive segments. The plural conductive segments are connected with the corresponding fixed resistors, respectively. While the sheet guiding module is moved relative to the sheet input tray, the contact element is moved with the sheet guiding module. When the electric connection between a first conductive segment and the second conducting part is established through the contact element, the corresponding fixed resistor provides a resistance value, and the circuit board issues a sensing signal according to the resistance value. The control unit acquires the size of the paper sheet according to the sensing signal.Type: ApplicationFiled: January 7, 2020Publication date: May 27, 2021Inventors: CHIH-CHIA LEE, CHUN-CHI WANG, CHAO-MIN YANG
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Patent number: 10571622Abstract: A light guide plate is provided in the invention. The light guide plate has a light incident surface, a bottom surface and a light exit surface. The bottom surface is opposite to the light exit surface. The light incident surface is connected between the bottom surface and the light exit surface. The light guide plate includes a plurality of light guide units and a plurality of microstructure units. The plurality of light guide units are convex to the bottom surface and arranged to be disposed along a direction parallel to the light incident surface. The plurality of light guide units is connected to each other on the light incident surface. The plurality of microstructure units are disposed corresponding to the plurality of light guide units respectively. Each of the microstructure units includes a plurality of microstructures. The invention further provides a backlight module having this light guide plate.Type: GrantFiled: October 15, 2018Date of Patent: February 25, 2020Assignee: Coretronic CorporationInventors: Tzeng-Ke Shiau, Chao-Min Yang
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Patent number: 10370211Abstract: A paper size detection module includes a position sensing assembly and a sliding block assembly. The position sensing assembly is installed on a bottom side of a paper supporting plate. The position sensing assembly includes a carrier plate, a sensing circuit board and plural elastomers. The first ends of the elastomers are connected with the sensing circuit board. The second ends of the elastomers are protruded out of the carrier plate and have corresponding pressed surfaces. The sliding block assembly includes a paper positioning block and at least one roller. The paper positioning block is installed on the paper supporting plate. The roller is connected with the paper positioning block and rolled along the carrier plate. When a position of the pressed surface rolled and pressed by the roller is detected, the sensing circuit board generates a paper size signal.Type: GrantFiled: April 25, 2018Date of Patent: August 6, 2019Assignee: PRIMAX ELECTRONICS LTDInventors: Chao-Min Yang, Chih-Chia Lee
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Publication number: 20190225442Abstract: A paper size detection module includes a position sensing assembly and a sliding block assembly. The position sensing assembly is installed on a bottom side of a paper supporting plate. The position sensing assembly includes a carrier plate, a sensing circuit board and plural elastomers. The first ends of the elastomers are connected with the sensing circuit board. The second ends of the elastomers are protruded out of the carrier plate and have corresponding pressed surfaces. The sliding block assembly includes a paper positioning block and at least one roller. The paper positioning block is installed on the paper supporting plate. The roller is connected with the paper positioning block and rolled along the carrier plate. When a position of the pressed surface rolled and pressed by the roller is detected, the sensing circuit board generates a paper size signal.Type: ApplicationFiled: April 25, 2018Publication date: July 25, 2019Inventors: Chao-Min Yang, Chih-Chia Lee
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Publication number: 20190113673Abstract: A light guide plate is provided in the invention. The light guide plate has a light incident surface, a bottom surface and a light exit surface. The bottom surface is opposite to the light exit surface. The light incident surface is connected between the bottom surface and the light exit surface. The light guide plate includes a plurality of light guide units and a plurality of microstructure units. The plurality of light guide units are convex to the bottom surface and arranged to be disposed along a direction parallel to the light incident surface. The plurality of light guide units is connected to each other on the light incident surface. The plurality of microstructure units are disposed corresponding to the plurality of light guide units respectively. Each of the microstructure units includes a plurality of microstructures. The invention further provides a backlight module having this light guide plate.Type: ApplicationFiled: October 15, 2018Publication date: April 18, 2019Inventors: TZENG-KE SHIAU, CHAO-MIN Yang
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Publication number: 20140300936Abstract: A scanning module structure includes an optical reflective casing, a light-emitting element, and an optical sensing module. The optical reflective casing includes plural fixed tilting structures and plural reflective aluminum sheets. The plural fixed tilting structures are integrally formed with the optical reflective casing. The plural reflective aluminum sheets are disposed on corresponding fixed tilting structures. The light-emitting element is used for emitting a light beam. The light beam is reflected by the plural reflective aluminum sheets. When the scanning module structure is enabled, the light beam emitted by the light-emitting element is projected onto a document. After the light beam is reflected by the document, the light beam is introduced into the optical sensing module. The light beam is sequentially reflected by the plural reflective aluminum sheets, and then projected onto the optical sensing module. Consequently, a document image corresponding to the document is generated.Type: ApplicationFiled: August 5, 2013Publication date: October 9, 2014Applicant: Primax Electronics Ltd.Inventors: Chao-Min Yang, Wen-An Huang
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Patent number: 8714545Abstract: A paper inverting device includes a first sensor, a second sensor, a guiding structure, a power mechanism, and a controller. The power mechanism is used for driving rotation of the guiding structure. The first sensor is used for detecting the position of the paper. The second sensor is used for detecting the thickness of the paper. According to the sensing signals from the first sensor and the second sensor, the controller may determine the timing of rotating the guiding structure and the rotating direction and the rotating angle of the guiding structure. Consequently, the guiding structure may be controlled to stop the paper and further invert the paper.Type: GrantFiled: August 31, 2012Date of Patent: May 6, 2014Assignee: Primax Electronics Ltd.Inventors: Wen-An Huang, Chao-Min Yang
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Publication number: 20140015190Abstract: A paper inverting device includes a first sensor, a second sensor, a guiding structure, a power mechanism, and a controller. The power mechanism is used for driving rotation of the guiding structure. The first sensor is used for detecting the position of the paper. The second sensor is used for detecting the thickness of the paper. According to the sensing signals from the first sensor and the second sensor, the controller may determine the timing of rotating the guiding structure and the rotating direction and the rotating angle of the guiding structure. Consequently, the guiding structure may be controlled to stop the paper and further invert the paper.Type: ApplicationFiled: August 31, 2012Publication date: January 16, 2014Applicant: Primax Electronics Ltd.Inventors: Wen-An HUANG, Chao-Min YANG
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Patent number: 8430399Abstract: A paper tray includes a first plate and an extension mechanism. The first plate includes a receiving space and a guiding groove. The extension mechanism includes a second plate, a paper stopper, and an elastic element. When the extension mechanism is moved to a first position in a direction opposite to the first plate and the paper stopper is rotated relative to the second plate in a first direction, the elastic element is pushed by an end of the paper stopper. Consequently, the elastic element generates an elastic potential energy. When the paper stopper is rotated relative to the second plate in a second direction, the elastic potential energy drives movement of the elastic element in a direction facing the first plate, so that the second plate is moved to a second position and the extension mechanism is automatically restored to the receiving space.Type: GrantFiled: August 30, 2012Date of Patent: April 30, 2013Assignee: Primax Electronics, Ltd.Inventors: Wen-An Huang, Chao-Min Yang
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Patent number: 8322903Abstract: A light source module includes a casing, at least one reflective layer, a light bar, and at least one light source. The casing has a first side wall and a second side wall, and the first side wall and the second side wall define an opening. The opening faces a light incident surface of a light guide plate, and the first side wall and the second side wall are respectively positioned on two opposite sides of the opening. The reflective layer is formed inside the casing and adjacent to one of the first side wall and the second side wall. The light bar is disposed inside the casing and forms an angle with the light incident surface of the light guide plate.Type: GrantFiled: November 24, 2010Date of Patent: December 4, 2012Assignee: Young Lighting Technology Inc.Inventors: Jui-Nien Jao, Chien-Hao Fu, Chao-Min Yang
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Patent number: 8246037Abstract: An automatic document feeder includes a feeder casing, a pressing structure, a guiding notch, plural first guiding ribs and plural second guiding ribs. The pressing structure is disposed on a bottom part of the feeder casing. The guiding notch is formed in the pressing structure. The first guiding ribs are arranged downstream of the guiding notch. The second guiding ribs are arranged beside the first guiding ribs. The height of the first guiding rib is smaller than the height of the second guiding rib. The lower first guiding ribs are used for guiding a thicker paper. The higher second guiding ribs are used for guiding a thinner paper.Type: GrantFiled: February 23, 2011Date of Patent: August 21, 2012Assignee: Primax Electronics Ltd.Inventors: Wen-An Huang, Chao-Min Yang, Wei-Hsun Hsu
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Publication number: 20120153564Abstract: An automatic document feeder includes a feeder casing, a pressing structure, a guiding notch, plural first guiding ribs and plural second guiding ribs. The pressing structure is disposed on a bottom part of the feeder casing. The guiding notch is formed in the pressing structure. The first guiding ribs are arranged downstream of the guiding notch. The second guiding ribs are arranged beside the first guiding ribs. The height of the first guiding rib is smaller than the height of the second guiding rib. The lower first guiding ribs are used for guiding a thicker paper. The higher second guiding ribs are used for guiding a thinner paper.Type: ApplicationFiled: February 23, 2011Publication date: June 21, 2012Applicant: PRIMAX ELECTRONICS LTD.Inventors: Wen-An Huang, Chao-Min Yang, Wei-Hsun Hsu
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Patent number: 8096545Abstract: A sheet-feeding scanning apparatus having a business card feeding mechanism is provided. The sheet-feeding scanning apparatus includes a scanning module, an ordinary document input tray, an ordinary document pick-up roller assembly, a transfer channel, a plurality of transfer rollers, an ejecting tray, an ejecting roller assembly, a business card input tray, and a business card pick-up roller assembly. The business card input tray includes a business card support plate, a spring, a separation slice and a position-limiting glide slot. The business card pick-up roller assembly includes a business card pick-up roller, a business card separation roller and a shaft rod. The shaft rod is sheathed by the business card separation roller. The sheet-feeding scanning apparatus is adapted for scanning images of multiple ordinary documents or multiple business cards.Type: GrantFiled: September 5, 2008Date of Patent: January 17, 2012Assignee: Primax Electronics Ltd.Inventors: Chung-Kai Wang, Wei-Hsun Hsu, Wen-An Huang, Chao-Min Yang
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Patent number: 8096547Abstract: A sheet stopping structure includes a sheet pick-up arm, a sheet guide casing and a sheet stopper. A receiving recess is formed in the sheet guide casing. Two sliding slots are respectively formed in two sidewalls of the receiving recess. The sheet stopper is installed in the receiving recess, and movable along the two sliding slots. When the sheet pick-up arm is in a standby position, the sheet stopper is maintained in an upright status and protruded outside the surface of the sheet guide casing. When the sheet pick-up arm is lowered to a sheet pick-up position, the sheet stopper is rotated and then stopped down within the receiving recess.Type: GrantFiled: May 26, 2011Date of Patent: January 17, 2012Assignee: Primax Electronics Ltd.Inventors: Wen-An Huang, Chao-Min Yang
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Patent number: 8061703Abstract: A sheet-feeding type scanning apparatus and an automatic sheet feeding method are provided. The sheet-feeding type scanning apparatus includes a scanning module, a first sheet input tray, a first sheet pick-up roller assembly, a sheet ejecting tray, a sheet transfer channel, a plurality of transfer roller assemblies, a sheet ejecting roller assembly, a sheet-feeding sensor and a clutch module. Once a first sheet article of multiple sheet articles placed on the first sheet input tray are fed into the internal portion of the sheet-feeding type scanning apparatus to trigger the sheet-feeding sensor, the clutch module is disabled. At this moment, a second sheet article placed on the first sheet input tray fails to be fed by the first sheet pick-up roller assembly. Therefore, the double feeding problem is solved.Type: GrantFiled: November 16, 2009Date of Patent: November 22, 2011Assignee: Primax Electronics Ltd.Inventors: Chung-Kai Wang, Chao-Min Yang, Wei-Hsun Hsu, Wen-An Huang
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Patent number: 7971866Abstract: A sheet-feeding scanning apparatus having a business card feeding mechanism is provided. The sheet-feeding scanning apparatus includes a scanning module, an ordinary document input tray, an ordinary document pick-up roller assembly, an ejecting tray, a transfer channel, a plurality of transfer rollers, a business card input tray, and a business card pick-up roller assembly. The business card input tray has a business card support plate. In a case that a jam event occurs, the business card support plate may be swung for facilitating removing the jammed business card.Type: GrantFiled: September 5, 2008Date of Patent: July 5, 2011Assignee: Primax Electronics Ltd.Inventors: Wen-An Huang, Chung-Kai Wang, Wei-Hsun Hsu, Chao-Min Yang
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Publication number: 20110149597Abstract: A light source module includes a casing, at least one reflective layer, a light bar, and at least one light source. The casing has a first side wall and a second side wall, and the first side wall and the second side wall define an opening. The opening faces a light incident surface of a light guide plate, and the first side wall and the second side wall are respectively positioned on two opposite sides of the opening. The reflective layer is formed inside the casing and adjacent to one of the first side wall and the second side wall. The light bar is disposed inside the casing and forms an angle with the light incident surface of the light guide plate.Type: ApplicationFiled: November 24, 2010Publication date: June 23, 2011Inventors: Jui-Nien JAO, Chien-Hao Fu, Chao-Min Yang
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Patent number: 7896336Abstract: A solenoid valve and an automatic document feeder using the solenoid valve are provided. The solenoid valve includes a valve body, a valve spindle, a spring, a ring-shaped groove and muffling ring. The ring-shaped groove is sheathed around the valve spindle. The muffling ring is disposed within the ring-shaped groove. When the valve body is magnetized to magnetically attract the valve spindle, the valve spindle is moved within the valve body, and the muffling ring collides with the recess inner wall, thereby reducing collision noise.Type: GrantFiled: June 12, 2009Date of Patent: March 1, 2011Assignee: Primax Electronics Ltd.Inventors: Chung-Kai Wang, Wen-An Huang, Chao-Min Yang, Wei-Hsun Hsu