A high-brightness uniform linear light source device for backlight and its application
A light source device, linear technology, applied in optics, optical components, instruments, etc., can solve the problems of obvious dimming effect, the light intensity is reduced inversely proportional to the square of the distance, etc., and achieves increased flexibility, adjustable brightness, and improved efficiency. Effect
Inactive Publication Date: 2016-06-22
BEIJING UNIV OF TECH
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Problems solved by technology
At present, the uniformization of the backlight light source is often achieved by a diffuser plate. The diffuser plate has good uniform illumination characteristics, but its light reduction effect is obvious. decrease rapidly inversely
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Embodiment 1
[0023] For linear light sources see figure 1 , the method of using the linear light source is as follows figure 2 As shown, 6 in the figure is a linear light source device, 7 is a transparent or translucent target to be detected, 8 is a line array camera and lens, the linear light source illuminates the target to be detected from the back, and the line array camera collects images from the front of the target to be detected , the lens focuses on the target to be tested, and adopts short depth of field imaging.
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A high-brightness uniform linear light source device for backlight and its application belong to the technical field of light source devices. It includes a point light source (1), a point light source imaging lens (2), a point-changing optical fiber homogenization light guide device (3), a strip lens (4), and a light source width and brightness adjustment device (5). The light source is homogenized once by the point-changing optical fiber homogenizing light guide device, and the outgoing light is homogenized twice by the one-way imaging of the strip lens. While ensuring the uniformity of the light source, the distance between the strip lens and the light-emitting surface of the optical fiber can be adjusted through the adjustment device, and then the imaging magnification can be adjusted to realize the brightness and width of the light source. In this way, the number of point light sources can be increased arbitrarily to increase the brightness of the light source.
Description
technical field [0001] The invention relates to a linear light source device with adjustable brightness and width suitable for backlight imaging of a line array camera and its application, belonging to the technical field of light source devices. Background technique [0002] For the detection of some transparent and translucent objects, line scan cameras are commonly used, such as plastic films, industrial or civilian films, etc. The realization method is to use a linear light source as the backlight, and use a translation device to move the transparent or translucent object in parallel at a uniform speed. The line array camera images the light source on the other side of the object, and then analyzes the defects or other quality problems in the object. [0003] At present, there are many linear light sources used to cooperate with linear array CCDs, but most of them use reflective imaging, that is, the light source and the camera are located on the same side of the object ...
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IPC IPC(8): G02B27/09G02B27/00G03B15/02
Inventor 闫志鸿谷春青宋永伦
Owner BEIJING UNIV OF TECH