Original reading apparatus for reading image of an original
AssigneeCanon Kabushiki Kaisha
InventorAyumu Murakami
Life of this patent
Estimating the term…
Abstract
A light guide includes a plurality of boss portions. A round hole portion is provided near the center of a base member for fixing the light guide, and slit portions are provided on both ends thereof. The round hole portion supports one boss portion in both the longitudinal direction and the lateral direction of the light guide. The slit portions support boss portions in the lateral direction of the light guide, but are free in the longitudinal direction of the light guide. That is, the center of the light guide is fixed from both directions, and thus both ends of the light guides can expand away in the longitudinal direction. This cuts the influence of expansion by half.
Claims11
An original reading apparatus comprising:
- an illumination unit configured to illuminate an original;
- and
- a base member having a first portion and plural second portions;
- a photoelectric conversion element configured to convert reflected light from the original illuminated by the illumination unit into an electrical signal,
- wherein the illumination unit includes:
- a plurality of light-emitting elements;
- and
- a light guide having a first boss portion and plural second boss portions, configured to guide light emitted from the plurality of light-emitting elements toward the original;
- wherein the first boss portion is engaged to the first portion, and the first boss portion arranged in a central area of the light guide in a longitudinal direction is supported by the first portion in both the longitudinal direction and a lateral direction of the light guide;
- and
- wherein the second boss portions are engaged to the second portions, and the second boss portions arranged on end areas of the light guide in the longitudinal direction are free in the longitudinal direction of the light guide and are supported by the second portions in the lateral direction of the light guide.
Dependencies are inferred from the claim text.