초록 ▼

A document illumination device includes a light-conducting member in which is formed a base surface that extends along a lengthwise direction, an irradiation surface that extends along the lengthwise direction and is tilted in the widthwise direction relative to the base surface, and a side surface

A document illumination device includes a light-conducting member in which is formed a base surface that extends along a lengthwise direction, an irradiation surface that extends along the lengthwise direction and is tilted in the widthwise direction relative to the base surface, and a side surface that extends in the lengthwise direction and connects the base surface to the irradiation surface; a scattering member that is provided opposing the base surface and the side surface and that scatters light emitted from the base surface and the side surface; and a light source provided opposing a lengthwise direction-end surface of the light-conducting member.

대표청구항 ▼

1. A contact-type image sensor module comprising: a light source;a light-conducting member that extends in a lengthwise direction and having an end face opposite the light source in the lengthwise direction, the light-conducting member including an irradiation surface for guiding light from the ligh

1. A contact-type image sensor module comprising: a light source;a light-conducting member that extends in a lengthwise direction and having an end face opposite the light source in the lengthwise direction, the light-conducting member including an irradiation surface for guiding light from the light source to an irradiated medium; anda lens member disposed along, and in contact with, the light-conducting member that forms an erect unmagnified image on a light-receiving surface of a linear image sensor;wherein a first angle is formed by the optical axes of the lens member and the light-conducting member, and a second angle is formed by the optical axis of the lens member and a segment of a light flux from an exit point on the irradiation surface to a point of incidence, andwherein the irradiation surface is oriented so as to increase the second angle relative to the first angle. 2. The contact-type image sensor module according to claim 1, further comprising: a scattering member:wherein the light-conducting member included a base surface facing the irradiation surface and side surface connecting the irradiation surface and the bottom face;wherein the side surface has a projecting portion; andwherein the scattering member is provided opposite the base surface and the side surface further toward the base surface than the projecting portion, the scattering member scattering light emitted from the base surface and the side surface. 3. An image reading device comprising: the contact-type image sensor module according to claim 2; anda positioning member that positions the document relative to the light source and the lens member. 4. The image reading device according to claim 3, further comprising: a light-transmissive placement member upon which a document is placed,wherein an angle formed between the placement member and the base surface is greater than an angle formed between the placement member and the irradiation surface. 5. The contact-type image sensor module according to claim 1, wherein the irradiation surface faces the optical axis of the lens member. 6. The contact-type image sensor module according to claim 5, wherein the irradiation surface refracts light emitted from the irradiation surface toward the optical axis of the lens member. 7. The contact-type image sensor module according to claim 5, wherein the irradiation surface faces the optical axis of the lens member. 8. The document illumination device according to claim 1, wherein the irradiation surface refracts light so that an angle formed between a line perpendicular to the irradiation surface and the light emitted from the irradiation surface is greater than an angle formed between the line perpendicular to the irradiation surface and light traveling toward the irradiation surface.