Projector comprising an expanding and contracting member configured to move a holding device when a temperature is changed

摘要

A projector includes: a display device which modulates illumination light; a projection lens which projects modulation light produced by the display device; and a holding device which has a holder member supporting the display device, a frame member supporting the projection lens and functions as a base capable of supporting the holder member, and an expanding and contracting member disposed between the frame member and the display device, wherein a temperature coefficient for the expansion and contraction of the expanding and contracting member in the direction of the optical axis of the projection lens corresponds to a temperature coefficient for the increase and decrease of the focal distance of the projection lens.

主权项

1. A projector comprising:
a light source, a display device which modulates illumination light from the light source; a projection lens which projects modulation light modulated by the display device; a holding device which has a holder member supporting the display device; a frame member supporting the projection lens; and an expanding and contracting member being configured to move the holding device, which the direction of the motion of the display device is the same as the direction of the motion of the back focus position of the projection lens when the temperature is changed.