Abstract: A projection lens including a front sleeve, a rear sleeve, a main sleeve, a driving ring, sliding components and lenses is provided. The main sleeve covers the front sleeve and the rear sleeve. The driving ring covers the front sleeve and the main sleeve. The sliding component is assembled to the driving ring. The lenses are disposed inside the front sleeve and the rear sleeve. The front sleeve has grooves and a first guiding part outside. The main sleeve has first threads and a second guiding part. Furthermore, the second guiding part engages with the first guiding part and the first threads on the main sleeve mesh with a plurality of second threads on the driving ring. The sliding components protrude from the driving ring into the grooves. When the driving ring rotates, the sliding components slide in the grooves and push the front sleeve along an axis to reciprocate.

Abstract: A projection lens including a front sleeve, a rear sleeve, a main sleeve, a driving ring, sliding components and lenses is provided. The main sleeve covers the front sleeve and the rear sleeve. The driving ring covers the front sleeve and the main sleeve. The sliding component is assembled to the driving ring. The lenses are disposed inside the front sleeve and the rear sleeve. The front sleeve has grooves and a first guiding part outside. The main sleeve has first threads and a second guiding part. Furthermore, the second guiding part engages with the first guiding part and the first threads on the main sleeve mesh with a plurality of second threads on the driving ring. The sliding components protrude from the driving ring into the grooves. When the driving ring rotates, the sliding components slide in the grooves and push the front sleeve along an axis to reciprocate.

Abstract: A plasma welding method for a golf club head includes the steps of: preparing a club head body and a striking plate, and mounting the striking plate to the club head body; moving a plasma nozzle to aim to a connection line formed between the club head body and the striking plate before the plasma welding; tilting the plasma nozzle a predetermined inclined angle with respect to a vertical direction of the combination of the club head body and the striking plate for the plasma welding; and controlling the tilted plasma nozzle to weld the striking plate to the club head body so as to constitute the golf club head.

Abstract: A plasma welding method for a golf club head includes the steps of: preparing a club head body and a striking plate, and mounting the striking plate to the club head body; moving a plasma nozzle to aim to a connection line formed between the club head body and the striking plate before the plasma welding; tilting the plasma nozzle a predetermined inclined angle with respect to a vertical direction of the combination of the club head body and the striking plate for the plasma welding; and controlling the tilted plasma nozzle to weld the striking plate to the club head body so as to constitute the golf club head.

Abstract: A television signal-receiving module includes a first slot for disposing a network interface module detachably. The network interface module receives a television signal. The television signal-receiving module further includes a switch electrically connected to the network interface module for switching a transmission route of the television signal, a decoder electrically connected to the switch for decompressing and decoding the television signal, and a second slot for disposing a cable television decryptor detachably. The second slot is electrically connected to the decoder and the switch. The switch is switched to the decoder or the cable television decryptor so as to decode or decrypt the television signal after the network interface module downconverts and demodulates the television signal.

Abstract: The present invention provides one pulsewidth control loop (PWCL) device with complementary signals. The PWCL device includes one control stage circuit, one buffer chain, one complementary circuit, two charge pumps, and one comparator. The control stage circuit is used to receive a clock signal and the control signal of the comparator, and output a signal to the buffer chain. The buffer chain is used to receive the output signal from the control stage circuit and output a signal to the complementary circuit. The complementary circuit is used to receive the output signal from the buffer chain and output two complementary signals. Each of the two charge pumps is used to receive one of the output signals from the complementary circuit and output a signal to be one of the inputs of the comparator. The comparator is used to receive the output signals from each of the two charge pumps. Then, the comparator outputs a signal and feedbacks to be one of the input signals of the control stage circuit.

Abstract: The present invention provides one pulsewidth control loop (PWCL) device with complementary signals. The PWCL device includes one control stage circuit, one buffer chain, one complementary circuit, two charge pumps, and one comparator. The control stage circuit is used to receive a clock signal and the control signal of the comparator, and output a signal to the buffer chain. The buffer chain is used to receive the output signal from the control stage circuit and output a signal to the complementary circuit. The complementary circuit is used to receive the output signal from the buffer chain and output two complementary signals. Each of the two charge pumps is used to receive one of the output signals from the complementary circuit and output a signal to be one of the inputs of the comparator. The comparator is used to receive the output signals from each of the two charge pumps. Then, the comparator outputs a signal and feedbacks to be one of the input signals of the control stage circuit.

Abstract: A power supply apparatus comprises a switching circuit including a primary power train circuit, a main transformer and a secondary power train circuit for receiving and rectifying an input voltage, an output filter for providing an output voltage to a load, and a voltage feedback coupled in series between the output voltage and the input voltage, in which the voltage feedback circuit includes a feedback control circuit for detecting the output voltage and outputting a voltage feedback control signal in response to the output voltage, a control circuit for outputting a first oscillating signal to the primary power train circuit, a magnetic element coupled in series between the feedback control circuit and the control circuit for receiving a second oscillating signal from the control circuit and coupling the second oscillating signal to the secondary power train circuit to drive the secondary power train circuit to accomplish synchronous rectification and coupling the voltage feedback control signal to the cont

Abstract: An apparatus for positioning interface cards in a computer housing includes a seat member and a locking member. The seat member has a first mounting plate and a second mounting plate connected perpendicularly to one another. A plurality of positioning channels are formed on the first mounting plate. Each of the positioning channels has a closed end and an open end. A resilient plate is provided on the second mounting plate by forming two slits in the second mounting plate. A projection is formed on the outside face of the resilient plate. The locking member has a first plate and a second plate perpendicularly connected to one side of the first plate. A U-shaped member is connected to the other side of the first plate and is connected slidably to the resilient plate of the second mounting plate.