# Patent

## Title
Layout of the optical path in the image capturing system and the method for forming the same

## Abstract

The image-capturing system comprises a image-capturing module and a plurality of mirrors, wherein the image-capturing module has a lens and a charge-coupled device (CCD). The image-capturing module is located on about the center in the image-capturing system, and a plurality of mirrors are arranged in the peripheral region within the image-capturing system to make the layout of optical path around the image-capturing module. Furthermore, reflectional angle of each mirror can be adjusted according to the requirement for design, so as to obtain the longest optical path.

## Background
CROSS REFERENCE TO RELATED APPLICATIONS
The present application is a Continuation of U.S. application Ser. No. 10/195,363, filed Jul. 16, 2002 now U.S. Pat. No. 7,250,976. The entire disclosure of prior application Ser. No. 10/195,363 is considered as being part of the disclosure of the present application and is hereby incorporated by reference herein in its entirety.


BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to layout of the optical path in the image-capturing system, and more particularly to an optimum layout of the optical path in the image-capturing system and the method for forming the same.
2. Description of the Prior Art
Recently, there are various digital products that have been developed within the industry, such as notebooks, Personal Digital Assistants (PDA), and Consumption-Communication-Computers (3C). Usually, these digital products include or connect with a monitor to display an image, such as liquid crystal display (LCD) or liquid crystal panel. For the image processing apparatus, in addition, they can be classed as a motionless-image processing apparatus, such as digital camera, scanner, and a moving-image processing apparatus, such as digital video camera.
In the image-processing apparatus, the image-capturing system is the most important member, wherein the image-capturing system is one of the products concerning optical principle that comprises various components, such as image-capturing system, reflector, lens. Generally, the image-capturing system includes a charge-coupled device (CCD) that is sensitive to light, and it can transform photosensitivity of each pixel device into image datum and store them.
In light of the scanner, conventional image-capturing system captures the image by moving the signal image-capturing apparatus and reflection of mirrors. When the light is reflected from the image on the sensitive surface of the charge-coupled device (CCD, a semiangle (θ/2) can be generated. Generally, the sensitive surface of the charge-coupled device (CCD) is a straight surface, and it is not an arc surface. Therefore, the sensitive surface of the charge-coupled device (CCD) cannot receive the reflecting light when the semiangle (θ/2) becomes over large. In view of this, the semiangle (θ/2) has to be decreased so as to completely receive the reflecting light by the charge-coupled device (CCD), wherein one of the method for decreasing the semiangle (θ/2) is to increase the optical paths. Furthermore, the longer the length of the optical paths, the smaller the semiangle (θ/2). In the same way, the longer the length of the optical paths, the smaller the sensitive surface of the charge-coupled device (CCD), so that the whole volume also can be decreased. Therefore, the image-capturing system with the longer optical path reduces the cost for fabricating the image-capturing module and easy to make it.
Moreover, the image-capturing module, the reflectors and the lens are arranged in the peripheral region of conventional image-capturing system. Referring to FIG. 1, the image-capturing system 100 comprises a case 110 with a layout region 110A for optical path, and a module region 110B therein, wherein the mirrors 120A to 120C are set in the layout region 110A; and further, the lens 130 and the image-capturing module 140 are set in the module region 110B. In general, the layout region 110A for optical path is located on the peripheral region of the case 110, which is only the space for being applied to the layout of optical path, and the methods for layout of optical path are difference among the various sizes of the circular diameter (Ø) of the lens. Therefore, if the sizes of the image-capturing module 140 and the lens 130 are greater, they will occupy the major portion of space in the case 110 of the image-capturing system 100 that results in the limitation of length in layout for optical path.
In accordance with the above description, a new optimum layout of the optical path in the image-capturing system and the method for forming the same is therefore necessary to reduce the requirement for space of the image-capturing system, so as to decrease the fabricative cost and easy to make it; and further, this invention can strengthen and raise the scanning quality.
SUMMARY OF THE INVENTION
In accordance with the present invention, a new optimum layout of the optical path in the image-capturing system and the method for forming the same is provided that substantially overcomes the drawbacks of the above mentioned problems in the conventional system. This invention can improve efficiency of conventional image-capturing system by increasing the length of the optical path.
Accordingly, it is an object of the present invention to provide a new optimum layout of the optical path in the image-capturing system and the method for forming the same. The present invention arranges the image-capturing module at the center of the image-capturing system, and layout of the optical path is distributed in the space of the image-capturing system abound the image-capturing module, whereby this invention design optimum space for obtaining the longest optical path.
Another object of the present invention is to provide an optimum layout of the optical path in the image-capturing system and the method for forming the same. This invention can obtain the longer optical path by setting a plurality of mirrors. Furthermore, this invention can also adjust angles of the mirrors to achieve the requirement of the longest optical path, whereby the layout for optical path is free to design, so as to decrease the fabricative cost and easy to make it. Therefore, this invention corresponds to economic effect and utilization in industry.
In accordance with the present invention, a new optimum layout of the optical path in the image-capturing system and the method for forming the same is provided. In this invention, the image-capturing system, such as chassis, comprises a image-capturing module and a plurality of mirrors, wherein the image-capturing module has a lens and a charge-coupled device (CCD). The image-capturing module is located on about the center in the image-capturing system, and a plurality of mirrors are arranged in the peripheral region within the image-capturing system to make the layout of optical path around the image-capturing module. Furthermore, reflectional angle of each mirror can be adjusted according to the requirement for design, so as to obtain the longest optical path.



BRIEF DESCRIPTION OF THE DRAWINGS
The foregoing aspects and many of the attendant advantages of this invention will become more readily appreciated as the same becomes better understood by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein:
FIG. 1 shows the layout for optical path of the conventional image-capturing system;
FIG. 2 shows the optimum layout for optical path of the image-capturing system in accordance with the first embodiment of the present invention; and
FIG. 3 shows the optimum layout for optical path of the image-capturing system in accordance with the second embodiment of the present invention.



DESCRIPTION OF THE PREFERRED EMBODIMENT
Preferred embodiments of the present invention will now be described in greater detail. Nevertheless, it should be recognized that the present invention can be practiced in a wide range of other embodiments besides those explicitly described, and the scope of the present invention is expressly not limited except as specified in the accompanying claims.
As illustrated in FIG. 2, in the first embodiment of the present invention, first of all, an image-capturing system 200 is provided. The image-capturing system 200 comprises: a case 210 with a light inlet 220 thereon, wherein the space within the case 210 is separated a center region 210A and a peripheral region 210B around the center region 210A; an image-capturing module 230 that is about located on the center region 210A within the case 210, wherein the image-capturing module 230 comprises a photosensor 240, such as charge-coupled device (CCD) or Complementary Metal-Oxide Semiconductor Sensor (CMOS Sensor), and a lens 250, and further, the lens 250 is set before the photosensor 240 to receive the reflective light via the light entrance of the image-capturing module 230; a plurality of mirrors 260A to 260E distributed in the peripheral region 210B within the case 210, such as the corners of the peripheral region 210B, so as to make the layout of optical path in circumference of the peripheral region 210B outside the center region 210A where the image-capturing module 230 is located, wherein the mirror 260A is the double-faced mirror, wherein one side of the mirror 260A fronts the light inlet 220 to reflect an incident light 270 into peripheral region 210B of the case 210, and the other side of the mirror 260A fronts the image-capturing module 230 to reflect the light to the lens 250.
Referring to FIG. 2, in this embodiment, when the incident light 270 enters the image-capturing system 200 via the light inlet 220 on the sidewall of the case 210, the incident light 270 is reflected onto the mirror 260B by way of one side of the mirror 260A to form a first optical path 280A. Then the light is reflected onto the mirror 260C from the mirror 260B to form a second optical path 280B. Afterward, the mirror 260C reflects the light onto the mirror 260D to form a third optical path 280C, and then the light is reflected onto the mirror 260E from the mirror 260D to form a fourth optical path 280D. Subsequently, the mirror 260E reflects the light onto the other side of the mirror 260A to form a fifth optical path 280E. Finally, the light is reflected into the image-capturing module 230 by way of the other side of the mirror 260A, so that the photosensor 240 receives the light via the lens 250.
As illustrated in FIG. 3, in the second embodiment of the present invention, first of all, an image-capturing system 300, such as chassis of the scanner, is provided. The image-capturing system 300 comprises: a case 310 with a light inlet 320 thereon, wherein the space within the case 310 is separated a center region 310A and a peripheral region 310B around the center region 310A; a image-capturing module 330 that is about located on the center region 310A within the case 310, wherein the image-capturing module 330 comprises a charge-coupled device (CCD) 340 and a lens 350, and further, the lens 350 is set before the charge-coupled device (CCD) 340 to receive the reflective light via the light entrance of the image-capturing module 330; a plurality of mirrors 360A to 360E distributed in the peripheral region 310B within the case 310, wherein the plurality of mirrors 360A to 360E are the single-faced mirrors, and individually, each is distributed with a predetermined angle at the predetermined position within the peripheral region 310B of the image-capturing system 300 to proceed with a plurality of reflections on the same mirror, and further, the position the mirror 360E is set that the light can be reflected into the image-capturing module 330.
Referring to FIG. 3, in this embodiment, when the incident light 370 enters the image-capturing system 300 via the light inlet 320 on the sidewall of the case 310, the incident light 370 is reflected in order among the mirror 360A to mirror 360D with various angles to proceed with the plurality of reflections, so as to form a plurality of optical paths 380A to 380F from the plurality of mirrors 360A to 360D each other. Finally, the light is reflected onto the mirror 360E from the mirror 360C by way of the optical path 380G, and then the mirror 360E reflects the light into the image-capturing module 330 to transmit the image signal, wherein the charge-coupled device (CCD) 340 can receive the light via the lens 350.
In these embodiments of the present invention, the present invention arranges the image-capturing module at the center of the image-capturing system, and layout of the optical path is distributed in the space of the image-capturing system abound the image-capturing module, whereby this invention design optimum space for obtaining the longest optical path. Moreover, this invention can obtain the longer optical path by setting a plurality of mirrors. Furthermore, this invention can also adjust angles of the mirrors to achieve the requirement of the longest optical path, whereby the layout for optical path is free to design, so as to decrease the fabricative cost and easy to make it. Therefore, this invention corresponds to economic effect and utilization in industry.
Of course, it is possible to apply the present invention for the image-capturing system, and to any scanner. Also, the present invention set the image-capturing module on the center region of the image-capturing system and design the optical path around the image-capturing module concerning layout for the optical path has not been developed at present.
Although specific embodiments have been illustrated and described, it will be obvious to those skilled in the art that various modifications may be made without departing from what is intended to be limited solely by the appended claims.
Obviously, many modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the present invention may be practiced otherwise than as specifically described herein.

## Claims

1. A method comprising:
reflecting light along an optical path between two or more mirrors, wherein at least one of the two or more mirrors comprises a first side and a second side, and wherein the light is reflected from both the first side and the second side; and
receiving the reflected light at a photosensor, wherein the optical path substantially encircles the photosensor.

2. The method according to claim 1, wherein the optical path completely encircles the photosensor.

3. The method according to claim 1, wherein an image-capturing device comprises the photosensor and a lens, wherein the optical path completely encircles the image-capturing device.

4. An apparatus comprising:
means for reflecting light along an optical path, wherein the means for reflecting comprises a double-faced mirror positioned in the optical path; and
means for sensing the reflected light, wherein the optical path substantially surrounds the means for sensing.

5. The apparatus according to claim 4, wherein the optical path completely surrounds the means for sensing.

6. The apparatus according to claim 4, further comprising means for focusing the reflected light, wherein the optical path completely surrounds the means for focusing.

7. An apparatus comprising:
two or more mirrors configured to reflect light along an optical path, wherein each of two sides of at least one of the two or more mirrors is configured to reflect the light along the optical path; and
a photosensor configured to receive the reflected light, wherein the optical path substantially encircles the photosensor.

8. The apparatus according to claim 7, wherein the optical path completely encircles the photosensor.

9. The apparatus according to claim 7, wherein an image-capturing device comprises the photosensor and a lens, and wherein the optical path completely encircles the image-capturing device.

10. A scanner comprising:
a case;
two or more mirrors configured to reflect light along an optical path, wherein one of the two or more mirrors comprises a double-faced mirror configured to reflect the light at least twice along the optical path; and
an image-capturing module comprising a photosensor and a lens, wherein the image-capturing module is configured to receive the reflected light, wherein the photosensor is positioned near a center of the case, and wherein the optical path at least partially encircles the photosensor.

11. The scanner according to claim 10, wherein the optical path completely encircles the photosensor.

12. An image-capturing system comprising:
a case, wherein a space within the case is separated into a center region and a peripheral region around the center region;
an image-capturing module comprising a photosensor that is located within the center region within the case; and
two or more mirrors, wherein at least one of the two or more mirrors comprises a double-faced mirror, and wherein the two or more mirrors are distributed in the peripheral region within the case to make a layout of an optical path in a circumference of the peripheral region outside the center region.

13. The image-capturing system according to claim 12, wherein one sidewall of the case comprises a light inlet.

14. The image-capturing system according to claim 12, wherein the peripheral region comprises corners within the peripheral region.

15. The image-capturing system according to claim 12, wherein the photosensor comprises a charge-coupled device.

16. The image-capturing system according to claim 12, wherein the image-capturing module comprises a lens.

17. The image-capturing system according to claim 12, wherein the image-capturing module comprises a lens, and wherein a position of the lens is set before the photosensor to receive light entering the image-capturing module.

18. The image-capturing system according to claim 12, wherein one side of the double-faced mirror fronts a light inlet to reflect an incident light into the peripheral region of the case.

19. The image-capturing system according to claim 18, wherein a second side of the double-faced mirror fronts the image-capturing module to reflect the incident light to a lens.

20. A system comprising:
a center region, wherein the center region has an image-capturing module comprising a photosensor therein;
a peripheral region around the center region, wherein the peripheral region has two or more mirrors therein, and wherein at least one of the two or more mirrors comprises a double-faced mirror; and
two or more optical paths, wherein at least one of the two or more optical paths is between adjacent mirrors, wherein the two or more mirrors are distributed in the peripheral region within a case to make a layout of at least one of the two or more optical paths in circumference of the peripheral region outside the center region, and wherein one of the two or more optical paths enters into the image-capturing module.

21. The system according to claim 20, wherein the photosensor comprises a charge-coupled device.

22. The system according to claim 20, wherein the image-capturing module comprises a lens.

23. The system according to claim 20, wherein the image-capturing module comprises a lens, and wherein a position of the lens is set before the photosensor to receive light entering the image-capturing module.

24. The system according to claim 20, wherein the two or more mirrors are distributed with a predetermined angle.

25. The system according to claim 20, wherein one side of the double-faced mirror fronts a position that incident light enters into the image-capturing module.

26. The system according to claim 25, wherein a second side of the double-faced mirror fronts the image-capturing module.

27. A chassis comprising:
a case with a light inlet thereon, wherein a space within the case is separated into a center region and a peripheral region around the center region;
an image-capturing module comprising a photosensor that is located in the center region within the case;
a first mirror that is a double-faced mirror, wherein one side of the first mirror fronts a position of the light inlet, and wherein a second side of the first mirror fronts the image-capturing module; and
one or more second mirrors that are distributed in corners of the peripheral region within the case to make a layout of an optical path in circumference of the peripheral region around the center region.

28. The chassis according to claim 27, wherein the image-capturing module comprises a lens that fronts the second side of the first mirror to receive light entering the image-capturing module, and wherein a position of the photosensor is behind the lens.

29. The chassis according to claim 27, wherein the photosensor comprises a charge-coupled device.

30. The method according to claim 1, wherein a case houses the photosensor, and wherein the photosensor is located near a center of the case.

31. The apparatus according to claim 4, further comprising means for housing the means for sensing, wherein the means for sensing is located at an approximate center of the means for housing.

32. The apparatus according to claim 7, further comprising a lens, wherein the optical path substantially encircles both the lens and the photosensor.

33. The scanner according to claim 10, wherein the two or more mirrors are located within the case.

34. The image-capturing system according to claim 12, wherein the photosensor is located on the center region of the case.

35. The chassis according to claim 27, wherein the optical path substantially surrounds the photosensor.