Projection lens unit of projector and projector
AssigneeFUJIFILM Corporation
InventorHiroshi Kuboya
Life of this patent
Estimating the term…
Abstract
A projection lens unit (15) of a projector (10) is disposed in a state in which an optical axis (CL) of the projection lens unit deviates from a center of an image forming panel (14); a first lens holder (43) of a lens barrel (40) includes holding pieces (55a, 55b) that are provided at intervals in a circumferential direction of a first lens group (L1) and are engaged with a first portion (A1) of the first lens group positioned on a side to which the image forming panel is shifted, and a holding piece (55c) that is engaged with a second portion (A2) of the first lens group positioned on a side opposite to the side to which the image forming panel is shifted; and the linear expansion coefficient of each of the holding pieces is lower than the linear expansion coefficient of the holding piece.
Claims20
A projection lens unit of a projector, which is disposed in a state in which an optical axis of the projection lens unit deviates from a center of an image forming panel of the projector, the projection lens unit comprising:
- a lens barrel that is disposed with one or more lens groups and a lens holder holding one or more the lens groups,
- wherein the lens holder includes a first part that is formed of a first material and a second part that is formed of a second material,
- wherein the first part is on a side of the lens holder where the image forming panel is shifted with respect to the optical axis of the projection lens unit,
- wherein the first part is positioned closer to the image forming panel than the second part, and
- wherein a linear expansion coefficient of the first material is lower than a linear expansion coefficient of the second material.
Dependencies are inferred from the claim text.