Projector with rotatable projection lens
AssigneeFUJIFILM Corporation
InventorHironobu Kayano
Life of this patent
Estimating the term…
Abstract
A projection lens is separated by a second mirror into a first optical system that is disposed so as to be closer to an image forming panel and a second optical system that includes the second mirror and is disposed so as to be closer to a screen which is a projection surface. The second optical system is held rotatably around a second optical axis with respect to the first optical system by a first rotation mechanism. A rotation angle of the second optical system with respect to the first optical system is detected by a first sensor. A tilt angle of the projected image on the projection surface by the rotation angle is obtained by a tilt correction section, and the display position of the image to be displayed on the image forming panel is corrected according to the tilt angle.
Claims5
A projector comprising:
- an image forming panel;
- a projection lens that projects an image on the image forming panel onto a projection surface;
- a casing to which the projection lens is attached;
- a shift mechanism that shifts the projection lens with respect to the image forming panel;
- and
- a correction section,
- the projection lens comprising:
- a mirror that bends an optical axis;
- a first optical system disposed on an image forming panel side with respect to the mirror, the optical axis of the first optical system intersecting with the image forming panel;
- a second optical system including the mirror and disposed on a projection surface side;
- a rotation mechanism that holds the first optical system rotatably around the optical axis of the first optical system with respect to the casing;
- and
- a sensor that detects a rotation angle of the first optical system by the rotation mechanism with respect to the casing,
- wherein, in a case where the shift mechanism shifts the projection lens, the correction section controls a shift amount of the projection lens in a vertical direction with respect to the image forming panel, based on the rotation angle detected by the sensor.
Dependencies are inferred from the claim text.