Contact-type image sensor
AssigneeRohm Co., Ltd.
InventorHisayoshi Fujimoto
Life of this patent
Estimating the term…
Abstract
A contact-type image sensor (20) comprises a case (21), a glass cover (22) provided on an upper surface of the case (21), a bottom substrate (23) mounted in a bottom surface of the case (21), light receiving elements (24) mounted on the bottom substrate, light emitting elements (25) for irradiating an object (D) on the glass cover (22) with light, and a rod lens array (27) for collecting the light reflected by the object (D) on the glass cover (22) onto the light receiving elements (24). The light emitting elements (25) are mounted on the bottom substrate (23). The contact-type image sensor further comprises a light guide (26) provided in the case (21) for efficiently directing the light from the light emitting elements (25) to a predetermined region (L) of the glass cover (22).
Claims7
A contact-type image sensor comprising:
- a common substrate provided with a plurality of light receiving elements and a light source;
- and a light guide for directing the light from the light source obliquely toward an object,
- wherein the light guide comprises a prism which is intimately fitted in a mounting space of a case;
- and
- wherein the prism includes a first incidence surface facing the light source, a second incidence surface inclined at a predetermined angle relative to the first incidence surface, at least one total reflection surface, and an outlet surface for casting obliquely toward the object the light reflected by the total reflection surface after incidence via the first and second incidence surfaces.
Dependencies are inferred from the claim text.