LIGHT PROJECTING APPARATUS OF SCANNER MODULE AND METHOD FOR ARRANGING LIGHT SOURCES THEREOF

• US 20090310344A1
• Filed: 10/02/2008
• Published: 12/17/2009
• Est. Priority Date: 06/13/2008
• Status: Active Grant

• Current Assignee: TECO Image Systems Co., Ltd.
• Original Assignee: TECO Image Systems Co., Ltd.
• Inventors: Chen, San-Tang
• Granted Patent: US 8,109,651 B2
• Time in Patent Office: Days
• US Class Current: 362/227
• 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 1/0285 in combination with at least one reflector which is in fixed relation to the light source
• CPC Class Codes: H04N 1/0286 in combination with a light integrating, concentrating or defusing cavity
• 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 1/1013 with sub-scanning by translatory movement of at least a part of the main-scanning components H04N1/107 takes precedence
• CPC Class Codes: H04N 1/193 using electrically scanned linear arrays , e.g. linear CCD arrays

Abstract

A light projecting apparatus of a scanner module and a method for arranging the light sources thereof is provided. The light projecting module includes a substrate, including a first end, a second end and a middle section, the first end and the second end respectively positioned at two sides of the middle section; and a plurality of light emitting diodes (LEDs), positioned on the substrate, an arrangement spacing interval being formed between the two adjacent light emitting diodes, the arrangement spacing interval being respectively decreased gradually toward the first end and the second end from the middle section.

Claims

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

a substrate, comprising a first end, a second end and a middle section, the first end and the second end being respectively positioned at two side of the middle section; and

a plurality of light emitting diodes, positioned on the substrate, an arrangement spacing interval being formed between the two adjacent light emitting diodes, the arrangement spacing interval being respectively decreased gradually from the middle section toward the first end and the second end.

2. The light projecting apparatus of a scanner module according to claim 1, wherein the first end, the second end and the middle section of the substrate are positioned on the same horizontal plane.

3. The light projecting apparatus of a scanner module according to claim 1, wherein the first end, the second end and the middle section of the substrate are positioned on different horizontal planes.

4. The light projecting apparatus of a scanner module according to claim 1, wherein the plurality of light emitting diodes are white light emitting diodes.

5. The light projecting apparatus of a scanner module according to claim 1, wherein the plurality of light emitting diodes are lighting emitting diodes of different brightness.

6. The light projecting apparatus of a scanner module according to claim 1, wherein the variation of the arrangement spacing interval from the middle section toward the first end is different from the variation thereof from the middle section toward the second end.

7. The light projecting apparatus of a scanner module according to claim 1, wherein the variation of the arrangement spacing interval from the middle section toward the first end is the same as the variation thereof from the middle section toward the second end.

8. The light projecting apparatus of a scanner module according to claim 1, wherein a value of the arrangement spacing interval is inversely proportional to the Nth power of an average brightness of the arrangement spacing interval.

9. The light projecting apparatus of a scanner module according to claim 8, wherein a value of the arrangement spacing interval is inversely proportional to the square of an average brightness of the arrangement spacing interval.

10. The light projecting apparatus of a scanner module according to claim 8, wherein a value of the arrangement spacing interval is inversely proportional to the third power of an average brightness of the arrangement spacing interval.

11. A method for arranging light sources of a scanner module, comprising the follow steps:

providing a substrate;

installing a plurality of light emitting diodes on the substrate in sequence by placing them according to a preset spacing interval;

calculating an average brightness of each preset spacing interval;

obtaining a plurality of arrangement spacing intervals corresponding to the plurality of preset spacing interval, a value of each arrangement spacing interval being directly proportional to a percentage of the average brightness of the corresponding preset spacing interval to an entire brightness; and

rearranging the plurality of light emitting diodes on the substrate in accordance with the arrangement spacing intervals.

12. The method for arranging light sources of a scanner module according to claim 11, wherein the substrate comprises a first end, a second end and a middle section, the first end and the second end are respectively positioned at two sides of the middle section.

13. The method for arranging light sources of a scanner module according to claim 12, wherein the arrangement spacing interval is gradually decreased from the middle section toward the first end and the second end respectively.

14. The method for arranging light sources of a scanner module according to claim 12, wherein the first end, the second end and the middle section of the substrate are positioned on the same horizontal plane.

15. The method for arranging light sources of a scanner module according to claim 12, wherein the first end, the second end and the middle section of the substrate are positioned on different horizontal planes.

16. The method for arranging light sources of a scanner module according to claim 11, wherein the plurality of light emitting diodes are white light emitting diodes.

17. The method for arranging light sources of a scanner module according to claim 11, wherein the plurality of light emitting diodes are lighting emitting diodes with different brightness.

18. The method for arranging light sources of a scanner module according to claim 11, wherein a value of the arrangement spacing interval is inversely proportional to the Nth power of an average brightness of the arrangement spacing interval.

19. The method for arranging light sources of a scanner module according to claim 18, wherein a value of the arrangement spacing interval is inversely proportional to the square of an average brightness of the arrangement spacing interval.

20. The method for arranging light sources of a scanner module according to claim 18, wherein a value of the arrangement spacing interval is inversely proportional to the third power of an average brightness of the arrangement spacing interval.