| 摘要 |
A projection device includes a light source for providing a light beam, a light valve device installed on an optical path of the light beam, and a projection lens. The light valve device includes a light valve having an incident surface and a dust-off device. The light beam projects to the incident surface, and the incident surface reflects the light beam to form an image light beam. The dust-off device is installed on the light valve for sealing the incident surface for preventing dust from falling on the light valve. The dust-off device includes a vibrator for removing dust thereon by vibration for preventing dust from affecting the quality of projection images. The projection lens is used for projecting the image light beam out of the projection device.
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