Liquid crystal logarithmic vision detector
A detector, logarithmic technology, applied in the field of liquid crystal logarithmic vision detector, can solve the problems of large up and down span, inconvenient use, large size, etc., and achieve the effects of body vision protection, convenient movement, and small size
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[0015] The present invention will be further described below in conjunction with the accompanying drawings and specific examples.
[0016] Such as figure 1 As shown, this example includes a frame 6 and a liquid crystal panel 5, and a visual target plate 1 (a high-grade acrylic plate in this example) engraved with a logarithmic vision chart is fixed on the front of the liquid crystal panel 5. Two cold cathode lamp tubes going up and down are respectively installed on the left and right sides of the liquid crystal panel 5, i.e. the first cold cathode lamp tube 7 on the upper left, the second cold cathode lamp tube 8 on the lower left, and the first cold cathode lamp tube on the upper right. Three cold cathode lamp tubes 3 and a fourth cold cathode lamp tube 2 at the bottom right. Reflectors are respectively installed on the outsides of the left and right cold cathode lamp tubes, that is, the first reflector 9 on the left and the second reflector 4 on the right. Under the effec...
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