LIGHT PROJECTING APPARATUS OF SCANNER MODULE

• US 20100123008A1
• Filed: 01/16/2009
• Published: 05/20/2010
• Est. Priority Date: 11/18/2008
• Status: Active Grant

• Current Assignee: TECO Image Systems Co., Ltd.
• Original Assignee: TECO Image Systems Co., Ltd.
• Inventors: Chen, San-Tang, LO, Hsin-Pao
• Granted Patent: US 8,056,807 B2
• Time in Patent Office: Days
• US Class Current: 235/454
• CPC Class Codes: H04N 1/02815 Means for illuminating the original, not specific to a particular type of pick-up head
• CPC Class Codes: H04N 1/02865 using an array of light sources or a combination of such arrays, e.g. an LED bar
• CPC Class Codes: H04N 1/02885 Means for compensating spatially uneven illumination, e.g. an aperture arrangement
• CPC Class Codes: H04N 1/0289 Light diffusing elements, e.g. plates or filters optical diffusing elements per se G02B5/02
• CPC Class Codes: H04N 1/0306 using a plurality of optical elements arrayed in the main scan direction, e.g. an array of lenses
• CPC Class Codes: H04N 1/0315 using photodetectors and illumination means mounted on separate supports or substrates or mounted in different planes
• CPC Class Codes: H04N 2201/03112 Light source
• CPC Class Codes: H04N 2201/03129 Transparent cover or transparent document support mounted on the head
• CPC Class Codes: H04N 2201/03137 Reflecting element downstream of the scanned picture elements

Abstract

A light projecting apparatus of a scanner module, including: a substrate, a plurality of light emitting diodes (LEDs), positioned on the substrate and adapted to generate a plurality of incident beams; a diffusion plate, corresponding to the plurality of LEDs, adapted to receive the plurality of incident beams and diffuse the plurality of incident beams uniformly over a scanned object and including: a first plane, receiving the plurality of incident beams; two end faces; connected to the two ends of the first plane in a transverse direction; and a second plane, the two ends thereof being respectively connected to the two end faces, adapted to diffuse the plurality of incident beams uniformly over the scanned object and including: a plurality of second transverse concave portions, adapted to diffuse the plurality of incident beams; and a plurality of second transverse convex portions, adapted to gather the plurality of incident beams, where the plurality of second transverse convex portions and the plurality of second transverse concave portions are interlaced in a transverse direction, allowing the plurality of incident beams to be diffused uniformly over the scanned object.

Claims

1. A light projecting apparatus of a scanner module, comprising:

a substrate,

a plurality of light emitting diodes (LEDs), positioned on the substrate and adapted to generate a plurality of incident beams; and

a diffusion plate, corresponding to the plurality of LEDs, adapted to receive the plurality of incident beams and diffuse the plurality of incident beams to a scanned object uniformly and comprising;

a first plane, receiving the plurality of incident beams;

two end faces;

connected to the two ends of the first plane in a transverse direction; and

a second plane, the two ends thereof being respectively connected to the two end faces, adapted to diffuse the plurality of incident beams to the scanned object and comprising;

a plurality of second transverse concave portions, adapted to diffuse the plurality of incident beams; and

a plurality of transverse convex portions, adapted to gather the plurality of incident beams, the plurality of second transverse convex portions and the plurality of second transverse concave portions being interlaced in a transverse direction, allowing the plurality of incident beams to be diffused uniformly over the scanned object.

2. The light projecting apparatus of a scanner module according to claim 1, wherein the plurality of second transverse convex portions and the plurality of second transverse concave portions are projected from the first plane in a longitudinal direction, and the longitudinal direction is substantially perpendicular to the transverse direction.

3. The light projecting apparatus of a scanner module according to claim 1, wherein the plurality of LEDs are arranged on the substrate in the transverse direction, the LEDs corresponds to the plurality of second transverse concave portions and project the plurality of incident beams directly toward the plurality of second transverse concave portions.

4. The light projecting apparatus of a scanner module according to claim 3, wherein an arrangement spacing interval is formed between the two adjacent LEDs, and the arrangement spacing interval is decreased gradually from the middle section of the substrate toward the two ends of the substrate.

5. The light projecting apparatus of a scanner module according to claim 1, wherein the brightness of the plurality of LEDs on the middle section of the substrate is smaller than the brightness of the plurality of LEDs on the two ends of the substrate.

6. The light projecting apparatus of a scanner module according to claim 1, wherein the first plane comprises:

a plurality of first transverse concave portions; and

a plurality of first transverse convex portions, interlaced with the plurality of first transverse concave portions in the transverse direction.

7. A light projecting apparatus of a scanner module, comprising:

a base, comprising a reflecting condensing face;

a substrate, positioned on one side of the reflecting condensing face;

a plurality of light emitting diodes (LEDs), positioned on the substrate and adapted to generate a plurality of incident beams; and

a diffusion plate, corresponding to the plurality of LEDs, adapted to receive the plurality of incident beams, diffuse the plurality of incident beams uniformly over the reflecting condensing face, and reflect the plurality of incident beams over a scanned object through the reflecting condensing face and comprising;

a first plane, receiving the plurality of incident beams;

two end faces;

connected to the two ends of the first plane in a transverse direction; and

a second plane, the two ends thereof being respectively connected to the two end faces, adapted to diffuse the plurality of incident beams over the reflecting condensing face and comprising;

a plurality of second transverse concave portions, adapted to diffuse the plurality of incident beams; and

a plurality of transverse convex portions, adapted to gather the plurality of incident beams, the plurality of second transverse convex portions and the plurality of second transverse concave portions being interlaced in a transverse direction, allowing the plurality of incident beams to be diffused uniformly over the reflecting condensing face and reflected to the scanned object through the reflecting condensing face.

8. The light projecting apparatus of a scanner module according to claim 7, wherein the base comprises a reflecting sheet attached to the reflecting condensing face.

9. The light projecting apparatus of a scanner module according to claim 7, wherein the plurality of second transverse convex portions and the plurality of second transverse concave portions are projected from the first plane in a longitudinal direction, and the longitudinal direction is substantially perpendicular to the transverse direction.

10. The light projecting apparatus of a scanner module according to claim 7, wherein the plurality of LEDs are arranged on the substrate in the transverse direction, and the LEDs corresponds to the plurality of second transverse concave portions and project the plurality of incident beams directly toward the plurality of second transverse concave portions.

11. The light projecting apparatus of a scanner module according to claim 10, wherein an arrangement spacing interval is formed between the two adjacent LEDs, the arrangement spacing interval decreasing gradually from the middle section of the substrate toward the two ends of the substrate.

12. The light projecting apparatus of a scanner module according to claim 7, wherein the brightness of the plurality of LEDs on the middle section of the substrate is smaller than the brightness of the plurality of LEDs on the two ends of the substrate.

13. The light projecting apparatus of a scanner module according to claim 7, wherein the first plane comprises:

a plurality of first transverse concave portions; and

a plurality of first transverse convex portions, interlaced with the plurality of first transverse concave portions in the transverse direction.

14. A light projecting apparatus of a scanner module, comprising:

a base, comprising a reflecting condensing face;

a substrate, positioned on one side of the reflecting condensing face; and

a plurality of light emitting diodes (LEDs), positioned on the substrate, adapted to generate a plurality of incident beams, projecting the plurality of incident beams to the reflecting condensing face, and reflect the plurality of incident beams over a scanned object through the reflecting condensing face.

15. The light projecting apparatus of a scanner module according to claim 14, further comprising a diffusion plate corresponding to the plurality of LEDs and adapted to receive the plurality of incident beams and diffuse the plurality of incident beams over the reflecting condensing face.

16. The light projecting apparatus of a scanner module according to claim 15, wherein the diffusing plate comprises:

a plurality of second transverse concave portions, adapted to diffuse the plurality of incident beams; and

a plurality of second transverse convex portions, adapted to gather the plurality of incident beams, the plurality of second transverse convex portions and the plurality of second transverse concave portions being interlaced in a transverse direction, allowing the plurality of incident beams to be diffused uniformly over the reflecting condensing face.

17. The light projecting apparatus of a scanner module according to claim 16, wherein the plurality of second transverse convex portions and the plurality of second transverse concave portions are projected from the first plane in a longitudinal direction, and the longitudinal direction is substantially perpendicular to the transverse direction.

18. The light projecting apparatus of a scanner module according to claim 17, wherein the LEDs corresponds to the plurality of second transverse concave portions and project the plurality of incident beams directly toward the plurality of the second transverse concave portions.

19. The light projecting apparatus of a scanner module according to claim 14, wherein the base comprises a reflecting sheet attached to the reflecting condensing face.

20. The light projecting apparatus of a scanner module according to claim 14, wherein the plurality of LEDs are arranged on the substrate in a transverse direction.