Dynamic shading apparatus and projector using the same

Abstract

The invention discloses a dynamitic shading device which comprises a motor, a shading element and a counterweight. The motor is provided with a rotating shaft; the shading element is provided with a shading part and a hub part connected with the shading part; and the hub part is sheathed on the rotating shaft. The counterweight is arranged in the shading element.

Description

technical field [0001] The invention relates to a light amount adjusting device of a projector, in particular to a dynamic shading device and a projector using the same. Background technique [0002] In general optical devices, such as front projection projectors, rear projection projectors, or cameras, etc., a control mechanism for passing light is required to generate image data with different brightness. In the case of a projector, the light source module generates light of a single color to a color wheel, and after being converted into colored light, it is necessary to continuously adjust the ratio of the amount of light passing through to produce an appropriate brightness and a good contrast ratio of the projected image. In order to meet this requirement, the prior art usually adopts a dynamic shading device to improve the projected image quality by continuously adjusting the amount of light passing through the light source. [0003] However, the traditional shading de...

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Problems solved by technology

[0003] However, the traditional shading device controls the passage of different amounts of light, so the shape design of the shading part and the light-transmitting part are not completely symmetrical, and the color wheel of the shading element is driven by a motor, so the traditional shading device is prone to vibration due to imbalance, resulting in shading device failure

In addition, due to the continuous irradiance of light on the shading surface, the heat will be conducted to the motor through the shaft, causing the motor to overheat and fail. Therefore, the problem of heat dissipation needs to be solved urgently.

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