Mechanical light modulation device

Abstract

The invention is a dimmer used in a projector. A light source and a reflection bowl are arranged in a light source cover, a lens is arranged at the light outlet of the light source cover via a lens support, a lead screw is arranged on the lateral frontal of the light source cover, the lower end of the lead screw is connected with a motor, the lead screw is screwed with a nut, a guide sleeve is arranged above the nut, and a bracket is connected with the lead screw via the guide sleeve and is fastened by the nut; a grating light screen is arranged on the bracket, and can move upwards and downwards in front of the light outlet of the light source cover along with the rotation of the lead screw. The device solves the technical problem that the illuminating brightness of a large projector in the film and television industry can not be adjusted, light dimming of the projector can be achieved, the dimming process is stably and gradually changed, the illuminating brightness is changed smoothly, the dimming structure is simple, and the operation is convenient.

Description

A mechanical dimming device technical field The invention relates to a dimming device for illuminating lamps, in particular to a mechanical dimming device for projecting slides. Background technique In various large-scale performances, projection slides are often used to project various scene patterns and increase performance effects. During the performance, the brightness of the scene needs to be adjusted at any time. For example, when the sky is getting dark, the brightness needs to be gradually changed from evening to night. This requires adjusting the light source of the projection slide, that is, dimming to reduce the brightness. In the currently used projection slides, since the light sources of the projection slides are mostly metal halide lamps, dysprosium lamps, and indium lamps, their common characteristics are high luminous efficiency and high color temperature. They are started by high frequency and high voltage and must have special ignition The device is use...

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to solve the problem that the lighting brightness of the existing projection slides cannot be adjusted, and to provide a mechanical dimming device installed in the projection slides, which can achieve the purpose of light adjustment by changing the beam size and output brightness of the projection slides

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