Patents by Inventor Chi Wah Cheng
Chi Wah Cheng 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).
-
Publication number: 20250071962Abstract: A method of transferring a plurality of electronic devices with a bond head mechanism having a bond head having a plurality of individually-displaceable bond arms includes the steps of: in a pickup operation, moving the bond head mechanism to position a first bond arm of the bond head mechanism over a first electronic device from a group of electronic devices from a supply of electronic devices arranged in a pickup area, and actuating only the first bond arm to pick up the first electronic device from the group of electronic devices; and moving the bond head to position a second bond arm of the bond head over a second electronic device from the group of electronic devices, and actuating only the second bond arm of the bond head to pick up the second electronic device.Type: ApplicationFiled: August 25, 2023Publication date: February 27, 2025Inventors: Chi Wah CHENG, Hok Man WAN, Tze Ki Tony LEUNG
-
Publication number: 20250031357Abstract: A bonding tool with a decoupling mechanism includes a shaft, a rotary module coupled to a first portion of the shaft, a rotary motion actuator operatively connected to the rotary module and operative to drive the rotary module and the shaft to rotate about a rotary axis extending substantially along a central axis of the shaft, a linear motion module coupled to a second portion of the shaft separate from the first portion, and a linear motion actuator operatively connected to the linear motion module and operative to drive the linear motion module and the shaft to move in directions parallel to the rotary axis.Type: ApplicationFiled: July 19, 2023Publication date: January 23, 2025Inventors: Chi Wah CHENG, Wan Yin YAU, Hok Man WAN
-
Patent number: 11600516Abstract: A die ejection apparatus operable to eject a die from a support has at least two ejector components configured to lift a die located on the support. The ejector components are moveable to a position in which a lifting force is exertable by the ejector components on the support, so as to lift a die located on the support. Movement of the die ejector components is initiated towards the support, and a moment when each of the die ejector components reaches the position is determined. A height offset of each die ejector component relative to a height of another die ejector component is determined upon reaching the said position, and relative heights of the die ejector components are adjusted in dependence upon the evaluated height offset.Type: GrantFiled: May 13, 2020Date of Patent: March 7, 2023Assignee: ASMPT SINGAPORE PTE. LTD.Inventors: Chi Wah Cheng, Wan Yin Yau, Kwok Pun Law
-
Patent number: 11592477Abstract: A test handler comprising a primary rotary turret comprising pick heads for transporting electronic components, and a secondary rotary turret arranged and configured to receive electronic components directly or indirectly from the primary rotary turret, the secondary rotary turret including multiple separate test sectors having component carriers for carrying the electronic components received from the primary rotary turret, wherein the multiple test sectors are rotatably movable relative to one another. The test handler also comprises at least one testing device positioned along a periphery of the secondary rotary turret, wherein the component carriers of the respective test sectors are operative to convey the electronic components to a position of the at least one testing device for testing.Type: GrantFiled: September 6, 2019Date of Patent: February 28, 2023Assignee: ASMPT SINGAPORE PTE. LTD.Inventors: Chi Wah Cheng, Kai Fung Lau, Yu Sze Cheung
-
Patent number: 11343949Abstract: An apparatus and a method for dispensing a viscous adhesive for attaching a semiconductor die onto a substrate are provided, where the method comprises the steps of dispensing a volume of viscous adhesive from a nozzle onto the substrate and moving the nozzle away from the substrate such that an adhesive tail is formed between the nozzle and the volume of viscous adhesive. The method further comprises the steps of capturing multiple images of the adhesive tail with an imaging device as the nozzle is moving away from the substrate with an imaging device; and thereafter detecting with the imaging device an instant when the adhesive tail breaks from the volume of viscous adhesive.Type: GrantFiled: March 13, 2018Date of Patent: May 24, 2022Assignee: ASM TECHNOLOGY SINGAPORE PTE LTDInventors: Chi Wah Cheng, Wan Yin Yau
-
Patent number: 11289445Abstract: An adhesive dispenser for a die bonding apparatus has an adhesive dispenser head configured to dispense adhesive onto bonding pads of a substrate, and a head conveyer configured to convey the adhesive dispenser head along orthogonal first and second axes for dispensing the adhesive onto target dispensing positions on the bonding pads. The head conveyor includes a first linear positioning motor operative to convey the adhesive dispenser head along the first axis and a rotary positioning motor coupled to the first linear positioning motor which is operative to rotate the adhesive dispenser head. The rotary positioning motor is configured to cooperate with the first linear positioning motor to convey the adhesive dispenser head along the second axis to the target dispensing positions.Type: GrantFiled: December 24, 2018Date of Patent: March 29, 2022Assignee: ASM TECHNOLOGY SINGAPORE PTE LTDInventors: Wan Yin Yau, See Lok Chan, Chi Wah Cheng
-
Publication number: 20210354355Abstract: A die ejection apparatus operable to eject a die from a support has at least two ejector components configured to lift a die located on the support. The ejector components are moveable to a position in which a lifting force is exertable by the ejector components on the support, so as to lift a die located on the support. Movement of the die ejector components is initiated towards the support, and a moment when each of the die ejector components reaches the position is determined. A height offset of each die ejector component relative to a height of another die ejector component is determined upon reaching the said position, and relative heights of the die ejector components are adjusted in dependence upon the evaluated height offset.Type: ApplicationFiled: May 13, 2020Publication date: November 18, 2021Inventors: Chi Wah CHENG, Wan Yin YAU, Kwok Pun LAW
-
Patent number: 10996308Abstract: A testing apparatus and a method for testing electronic devices is provided. The apparatus comprising a plurality of detachably mountable test stations which are operative to perform tests on the electronic devices and a plurality of pick heads for conveying the electronic devices to at least one of the plurality of test stations for testing. The apparatus further comprises an identification element incorporated in each test station indicating a characteristic of the test station, and an identification element detector movable relative to the plurality of test stations, the identification element detector being operative to identify and authenticate the characteristic of the at least one test station by detecting the identification element incorporated in the test station, prior to utilizing the test station for testing the electronic devices.Type: GrantFiled: April 17, 2018Date of Patent: May 4, 2021Inventors: Chi Wah Cheng, Yu Sze Cheung
-
Publication number: 20200341056Abstract: A test handler comprising a primary rotary turret comprising pick heads for transporting electronic components, and a secondary rotary turret arranged and configured to receive electronic components directly or indirectly from the primary rotary turret, the secondary rotary turret including multiple separate test sectors having component carriers for carrying the electronic components received from the primary rotary turret, wherein the multiple test sectors are rotatably movable relative to one another. The test handler also comprises at least one testing device positioned along a periphery of the secondary rotary turret, wherein the component carriers of the respective test sectors are operative to convey the electronic components to a position of the at least one testing device for testing.Type: ApplicationFiled: September 6, 2019Publication date: October 29, 2020Inventors: Chi Wah CHENG, Kai Fung LAU, Yu Sze CHEUNG
-
Patent number: 10741434Abstract: An apparatus for placing ultra-small electronic devices into pockets on a carrier tape for packing has at least one holding element, a movement mechanism, a conveying mechanism and a positioning mechanism. The positioning mechanism further includes first and second positioning devices coupled to the conveying mechanism, wherein the second positioning device is mounted on the first positioning device. In use, the conveying mechanism conveys the carrier tape to move each pocket to a receiving position and the movement mechanism moves each holding element to place the electronic device into a respective pocket at the receiving position. The positioning mechanism adjusts a relative position between the electronic device and the respective pocket by adjusting the carrier tape, the first and second positioning devices being for coarse and fine positioning of the conveying mechanism respectively.Type: GrantFiled: September 24, 2018Date of Patent: August 11, 2020Assignee: ASM TECHNOLOGY SINGAPORE PTE LTDInventors: Kai Fung Lau, Chi Wah Cheng
-
Publication number: 20200203305Abstract: An adhesive dispenser for a die bonding apparatus has an adhesive dispenser head configured to dispense adhesive onto bonding pads of a substrate, and a head conveyer configured to convey the adhesive dispenser head along orthogonal first and second axes for dispensing the adhesive onto target dispensing positions on the bonding pads. The head conveyor includes a first linear positioning motor operative to convey the adhesive dispenser head along the first axis and a rotary positioning motor coupled to the first linear positioning motor which is operative to rotate the adhesive dispenser head. The rotary positioning motor is configured to cooperate with the first linear positioning motor to convey the adhesive dispenser head along the second axis to the target dispensing positions.Type: ApplicationFiled: December 24, 2018Publication date: June 25, 2020Inventors: Wan Yin YAU, See Lok CHAN, Chi Wah CHENG
-
Publication number: 20200098614Abstract: An apparatus for placing ultra-small electronic devices into pockets on a carrier tape for packing has at least one holding element, a movement mechanism, a conveying mechanism and a positioning mechanism. The positioning mechanism further includes first and second positioning devices coupled to the conveying mechanism, wherein the second positioning device is mounted on the first positioning device. In use, the conveying mechanism conveys the carrier tape to move each pocket to a receiving position and the movement mechanism moves each holding element to place the electronic device into a respective pocket at the receiving position. The positioning mechanism adjusts a relative position between the electronic device and the respective pocket by adjusting the carrier tape, the first and second positioning devices being for coarse and fine positioning of the conveying mechanism respectively.Type: ApplicationFiled: September 24, 2018Publication date: March 26, 2020Inventors: Kai Fung LAU, Chi Wah CHENG
-
Patent number: 10473714Abstract: A method for automated alignment between a plurality of electronic components and at least one testing device for receiving the electronic components for testing which includes defining a fiducial marker and positioning a moveable imaging device relative to a stationary imaging device, such that the fiducial marker is within a field of view of the moveable imaging device and within a field of view of the stationary imaging device. The moveable imaging device determines, with respect to each of the at least one testing device, a first offset between the testing device and the fidicual marker. The stationary imaging device determines, with respect to each electronic component, a second offset between the electronic component and the fidicual marker. Alignment is effected between each electronic component and the testing device in accordance with the first and second offsets.Type: GrantFiled: March 6, 2017Date of Patent: November 12, 2019Assignee: ASM TECHNOLOGY SINGAPORE PTE LTDInventors: Chi Wah Cheng, Chi Hung Leung, Yu Sze Cheung, Kai Fung Lau
-
Publication number: 20190317174Abstract: A testing apparatus and a method for testing electronic devices is provided. The apparatus comprising a plurality of detachably mountable test stations which are operative to perform tests on the electronic devices and a plurality of pick heads for conveying the electronic devices to at least one of the plurality of test stations for testing. The apparatus further comprises an identification element incorporated in each test station indicating a characteristic of the test station, and an identification element detector movable relative to the plurality of test stations, the identification element detector being operative to identify and authenticate the characteristic of the at least one test station by detecting the identification element incorporated in the test station, prior to utilizing the test station for testing the electronic devices.Type: ApplicationFiled: April 17, 2018Publication date: October 17, 2019Inventors: Chi Wah CHENG, Yu Sze CHEUNG
-
Publication number: 20190289760Abstract: An apparatus and a method for dispensing a viscous adhesive for attaching a semiconductor die onto a substrate are provided, where the method comprises the steps of dispensing a volume of viscous adhesive from a nozzle onto the substrate and moving the nozzle away from the substrate such that an adhesive tail is formed between the nozzle and the volume of viscous adhesive. The method further comprises the steps of capturing multiple images of the adhesive tail with an imaging device as the nozzle is moving away from the substrate with an imaging device; and thereafter detecting with the imaging device an instant when the adhesive tail breaks from the volume of viscous adhesive.Type: ApplicationFiled: March 13, 2018Publication date: September 19, 2019Inventors: Chi Wah CHENG, Wan Yin YAU
-
Publication number: 20190257876Abstract: Defects in an electronic device are detected by capturing a first image from a first side of the electronic device, and capturing a second image from a second side of the electronic device which is different from the first side. The first and second images are captured when an inside of the electronic device is illuminated by light rays passed therethrough. If a defect is present in the electronic device, a profile of the defect is determined based on the first and second images and the electronic device is rejected if it is assessed from the profile of the defect that it is of a type for which the electronic device should be rejected.Type: ApplicationFiled: February 21, 2018Publication date: August 22, 2019Inventors: Chung Yan LAU, Chi Wah CHENG
-
Patent number: 10338006Abstract: A method for automated alignment of electronic components with respect to one or more inspection devices for inspecting the electronic components, each electronic component having a plurality of side surfaces. The method comprises: positioning each electronic component relative to an imaging device; determining, by the imaging device, an angular offset and a linear offset between each side surface of the electronic component and the one or more inspection devices; positioning each electronic component relative to the inspection devices; effecting alignment between each side surface and the one or more inspection devices in accordance with the respective angular and linear offsets; and inspecting each side surface after effecting alignment between the side surface and the inspection devices.Type: GrantFiled: June 15, 2017Date of Patent: July 2, 2019Assignee: ASM TECHNOLOGY SINGAPORE PTE LTDInventors: Chi Wah Cheng, Kai Fung Lau, Hoi Shuen Tang
-
Publication number: 20190067049Abstract: Semiconductor wafer cutting is optimised by directing a plurality of laser beams at the wafer, with the laser beams being focused so that at least some of their respective focal points are located at different depths throughout the wafer.Type: ApplicationFiled: August 23, 2017Publication date: February 28, 2019Inventors: Chi Wah CHENG, Lap Kei CHOW, Chi Hang KWOK
-
Publication number: 20180364180Abstract: A method for automated alignment of electronic components with respect to one or more inspection devices for inspecting the electronic components, each electronic component having a plurality of side surfaces. The method comprises: positioning each electronic component relative to an imaging device; determining, by the imaging device, an angular offset and a linear offset between each side surface of the electronic component and the one or more inspection devices; positioning each electronic component relative to the inspection devices; effecting alignment between each side surface and the one or more inspection devices in accordance with the respective angular and linear offsets; and inspecting each side surface after effecting alignment between the side surface and the inspection devices.Type: ApplicationFiled: June 15, 2017Publication date: December 20, 2018Inventors: Chi Wah CHENG, Kai Fung LAU, Hoi Shuen TANG
-
Patent number: 10115620Abstract: Disclosed is an apparatus for handling electronic components and a method of adjusting the position of at least one handling device of an apparatus for handling electronic components.Type: GrantFiled: August 31, 2015Date of Patent: October 30, 2018Assignee: ASM TECHNOLOGY SINGAPORE PTE LTDInventors: Yu Sze Cheung, Chi Wah Cheng, Chi Fung Chan