Rapid contrast adjusting structure and projector

Abstract

The invention discloses a rapid contrast adjusting mechanism. The rapid contrast adjusting mechanism comprises a base plate, a first light blocking sheet and a second light blocking sheet. The base plate is provided with three base plate axle holes in the same straight line. A crescent base plate limiting groove is formed between every two adjacent base plate shaft holes. A transmission shaft of a transmission gear penetrates through the base plate axle hole in the middle and then is connected with one end of a compression spring, and the other end of the compression spring is connected with a control frame. The transmission gear is connected with a motor. A light blocking sheet center shaft and a light blocking sheet limiting shaft are arranged at the lower portion of the first light blocking sheet, a light blocking sheet center shaft and a light blocking sheet limiting shaft are arranged at the lower portion of the second light blocking sheet, the light blocking sheet center shafts penetrate through the base plate axle holes in the edges respectively, the light blocking sheet limiting shafts penetrate through the base plate limiting grooves, the two light blocking sheet center shafts are connected with a second return spring and a third return spring respectively after penetrating through the base plate, and the other end of the second return spring and the other end of the third return spring are fixed to the base plate.

Description

technical field [0001] The invention belongs to a fast contrast adjustment structure and a projector. Background technique [0002] So far, the technology of projectors has become more and more mature, and people's dependence on projectors has become stronger and stronger, such as the contrast ratio requirements of projectors. [0003] The contrast ratio of projectors has always been a difficult problem to overcome. Contrast ratio is the ratio of the brightness of the brightest point projected by the projector on the screen divided by the brightness of the darkest point. At present, the contrast ratio of the projector can be up to 100000:1, but this is only the contrast ratio during measurement, that is to say, the contrast adjustment structure is used to block all the light when testing the contrast ratio, so that it cannot be projected from the projector. The resulting contrast has no practical significance, because the contrast adjustment structure does not work in actua...

AI Technical Summary

Problems solved by technology

At present, the contrast ratio of the projector can be up to 100000:1, but this is only the contrast ratio during measurement, that is to say, the contrast adjustment structure is used to block all the light when testing the contrast ratio, so that it cannot be projected from the projector. The resulting contrast has no practical significance, because the contrast adjustment structure does not work in actual use

If there is no contrast adjustment structure, the contrast ratio of the projector can be up to 2000:1, which is far from the current TV.

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