Asm Assembly Automation Limited

Asm Technology Singapore Pte Ltd

Agency for Science, Technology and Research

Hon Yu Peter Ng

Gary Peter Widdowson

Ajit S Gaunekar

Wai Chuen Gan

Kui Yao

Yam Mo Wong

Keng Yew Song

Gang Ou

Trung Dung Luong

Ping Kong Choy

Ping Kong Joseph Choy

You Yong Liao

Siu Yan Ho

Shing Wai Tam

Shiqiang Yao

Dazhang Liao

Chung Sheung Tate Yung

Ju Fan

Wang Hay Kenneth Tsui

Liming Fan

Xianbin Zhu

Wing Fung Jacob Cheung

King Sang Tsui

Saravanan Shanmugavel

The miniaturized piezoelectric accelerometer includes a support frame () having a cavity () and a seismic mass () supported by a plurality of suspension beams () extending from the support frame (). Each of the suspension beams () has a piezoelectric thin film coated on a top surface thereof, with a pair of inter-digital electrodes () deposited on an upper surface of each piezoelectric thin film. The presence of acceleration excites bending and thus strain in the piezoelectric thin film, which in turn causes electrical signals to be generated over terminals of the electrodes (). To collect constructively the output of the electrodes (), one terminal of each of the electrodes () is routed to and electrically connected at a top surface () of the seismic mass ().

Miniaturized piezoelectric accelerometers

A liquid dispensing apparatus is provided which has a syringe for storing and dispensing a liquid, and a connector passage connected to the syringe. A positive pressure passage is connected to an air source for supplying positive pressure to the syringe, and there is a pressure valve located along the positive pressure passage that is operative to control the flow of air along the positive pressure passage. A vacuum passage is connected to a vacuum generator for supplying vacuum pressure to the syringe, and there is a vacuum valve located along the vacuum passage that is operative to control the flow of air along the vacuum passage. The positive pressure passage and vacuum passage are connected to the connector passage. A pressure sensor is also provided to measure the pressure in the connector passage.

Apparatus for dispensing measured quantities of liquid

A driving mechanism comprises a fixed housing, a movable housing on which an object to be driven is mounted and a driving motor which is operative to drive the movable housing to move linearly as well as to rotate relative to the fixed housing. An inductance-type encoder determines both linear and rotary displacement of the movable housing relative to the fixed housing, whereby to provide closed-loop control of the position of the object in both linear and rotary directions.

Driving mechanism having position encoder for two-dimensional positioning

An alignment tool for a bonding apparatus comprises a loading surface for receiving a pushing force from a surface of a device which is attached to the bonding apparatus, the loading surface being arranged and constructed to experience a tilting moment upon receiving an unequally distributed pushing force from a misaligned device acting on it. The loading surface transmits the tilting moment experienced by it to a sensing surface which is operatively connected to the loading surface through a columnar body, which has a smaller width than the loading surface and the sensing surface, and which connects the loading surface and the sensing surface. An array of piezoelectric elements communicates with the sensing surface and produces electrical signals in response to the tilting moment such that a computing unit operatively connected to the piezoelectric elements may detect a direction of tilt of the loading surface from the electrical signals produced by the piezoelectric elements.

Bondhead alignment tool for a bonding apparatus

A method for damping vibrations in a stepper motor with micro-stepping control which comprises the steps of identifying the force amplitudes and phase shifts of multiple harmonic detent torques of the stepper motor, such as the first, second and fourth harmonic detent torques, and tuning the stepper motor with different current commands until minimum friction and resistive torque are obtained. Thereafter, a compensating harmonic current derived from said force amplitudes and phase shifts of the said multiple harmonic detent torques is injected into a current command during operation of the stepper motor to compensate for torque ripples.

Model-based active electronic damping for stepper motors

A linear actuator for a motion system is provided with a velocity sensor for monitoring a velocity of an actuation arm that it is driving. The linear actuator comprises a magnetic field, a first coil that is controllably movable within the magnetic field by adjusting a current flowing through the first coil whereby to drive the actuation arm and a second coil that is movable with the first coil and configured such that a voltage is inducible in the second coil that is proportional to its velocity. A controller device is connected to the second coil for receiving feedback indicating the voltage induced in the second coil whereby a velocity of the actuation arm is determinable, wherein the controller device is further connected to the first coil and is operative to adjust the current flowing in the first coil based upon said feedback for controllably driving the actuation arm.

Linear actuator comprising velocity sensor

Apparatus for detecting the oscillation amplitude of an oscillating object ( ) includes an optical radiation source ( ) and a detector ( ) including first and second optical radiation sensing areas ( A, B) adjacent each other. The detector ( ) and the optical radiation source ( ) are adapted to be located opposite each other with the oscillating object ( ) located between the source ( ) and the detector ( ) so that the object ( ) blocks a portion of the sensing areas ( A, B) from receiving optical radiation from the source ( ). A processor ( ) coupled to the detector ( ) receives first and second output signals representing the magnitude of optical radiation sensed by the first and second optical radiation sensing areas ( A, B), respectively. The processor ( ) processes the first and second output signals to obtain an indication of the amplitude of oscillation of the object ( ).

Apparatus for detecting the oscillation amplitude of an oscillating object

Growing community of inventors

Hong Kong, China

Hon Yu Peter Ng