摘要:
A Fresnel composite lens for used in an infrared touch control device including a number of infrared emitters and an infrared receiver. The Fresnel composite lens includes a number of Fresnel lens portions having a plurality of parallel optical axes, each Fresnel lens portion having a corresponding optical axis. Each Fresnel lens portion corresponds to a particular emitter and is configured for converging and directing light from a corresponding infrared emitter to the infrared receiver. The Fresnel lens portions are configured for focusing the light from the respective infrared emitters at a common point located on the infrared receiver.
摘要:
A color temperature adjusting system includes a processing unit, a constant-current drive unit, and an light emitting unit (LED) unit including two unmatched LED modules with different basic color temperatures. A table records a relationship between coefficient values and current values for the current(s) flowing through the two LED modules. The processing unit selects one of a number of predetermined formulas to calculate the coefficient value by comparing a desired value with a threshold value, and further determines the current values according to the calculated coefficient value listed in a table. The constant-current drive unit includes two drive module generating modulating signals to adjust the respective values of the current flowing through the two LED modules to match the determined current values, thereby adjusting the color temperature value of the LED unit to the desired level. A related method is also provided.
摘要:
A double-sided LED lamp includes a shell, a plastic circuit board (PCB) and an optical film. The shell is made of translucent or transparent material. The PCB includes a number of rows of LEDs for emitting light beams, and defines a number of rows of through holes. The optical film facing the LEDs can reflect some of the light beams through the number of holes and also allow some of the light beams to pass through.
摘要:
An aluminum alloy truss structure, comprising upper chord members, lower chord members, web members and all connection nodes by which the members are connected using riveting bolts, the chord members and web members being interconnected using tenons and mortise grooves that mate with each other respectively, each of the chord members being provided with a tenon plate at the end adjacent to the respective web members, each of the web members being correspondingly provided with a mortise groove at either end thereof, and the tenon plate on the chord members being implanted into the mortise groove on the web members; or, alternatively, each of the chord members being provided with a mortise groove at the end adjacent to the respective web members, each of the web members being correspondingly provided at either end thereof with a tenon that is to mate with the mortise groove.