Projection lens and projector
AssigneeFUJIFILM Corporation
InventorHitoshi SHIMIZU
Life of this patent
Estimating the term…
Abstract
A projection lens is shifted in the direction of an arrow A1 by a shift mechanism to change the position of a projection image on a screen. A first optical system forms an image of an image display panel on an intermediate imaging plane. A second optical system projects the image, which is formed on the imaging plane, onto the screen. A warning indicator member includes a mask and a warning mark, and is disposed on the imaging plane of the first optical system. The warning mark is formed at a portion of the warning indicator member where an image frame of an intermediate image is hidden by the mask. In a case in which the projection lens is excessively shifted, the image of the warning mark is displayed on the screen. Accordingly, a user can reliably know that a part of an image is missed.
Claims20
A projection lens that projects an image of an image display panel onto a projection surface and is used for a projector shifting one of the image display panel and the projection lens in a direction crossing an optical axis to adjust a projection position of the image on the projection surface, the projection lens comprising:
- a first optical system that forms the image of the image display panel;
- a second optical system that projects the image, which is formed by the first optical system, onto the projection surface;
- and
- a warning indicator member that displays an outside of a projection range of the image depending on the shift of one of the image display panel and the projection lens in a direction crossing an optical axis of the first optical system.
Dependencies are inferred from the claim text.