USRE41794EExpiredUtility

Optical lens device of image scanner

Assignee: HUANG SHI-HUAPriority: Apr 12, 2002Filed: Aug 3, 2006Granted: Oct 5, 2010

Est. expiryApr 12, 2022(expired)· nominal 20-yr term from priority

Inventors:Shi-Hua Huang Po-Hua Fang

G03B 27/50G02B 13/24G02B 26/10H04N 1/1017

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Claims

Abstract

An optical lens device of image scanner includes a diaphragm and plural lenses. The plural lenses, diaphragm, and image induction element are linearly arranged for defining an optical path between the document and the image induction element. Wherein, among the plural lenses, the one that is most close to the manuscript is called the first lens, and the other one that is most close to the image induction element is called the last lens, and the distance between the last lens and the image induction element is called BFL, and the length of the image induction element is called image height, and the total optical length between the document and the image induction element is called TT, and the effective focus length of the optical lens device is called EFL. If the optical lens device fulfills following conditions: the diameter of the last lens/the diameter of the first lens>1; EFL/image height<0.9; and BFL/TT<0.05, then the values of TT and BFL may be reduced relatively, and the entire volume of the image scanner may also be shrunk relatively.

Claims

exact text as granted — not AI-modified

1. An optical lens device of an image scanner may receive the optical image reflected from a document and focuses the optical image into an image on an image induction element, and the optical lens device , comprising:
a diaphragm; and
plural lenses, which are arranged linearly with the diaphragm and the an image induction element for defining an optical path between the a document and the image induction element, wherein, according to the different positions between the lens plural lenses and the diaphragm, the plural lenses may be are divided into two groups; i.e., the , wherein a front group lens of lenses is located between the diaphragm and the document, and the wherein a back group lens of lenses is located between the diaphragm and the image induction element;
wherein, among the plural lenses, the one that a first lens is most close to the document is called the first lens , while the other one that i wherein a last lens is most close to the image induction element is called the last lens , and the wherein a distance that is between the last lens and the image induction element is abbreviated as BFL, and the wherein a length, of the induced image, provided by the image induction element is called the an image height, and the wherein a distance between the document and the image induction element is abbreviated as TT, and the wherein an effective focus length of the optical lens device is abbreviated as EFL; and,
wherein, the a ratio between the a diameter of the last lens of the optical lens device and the a diameter of the first lens is greater than one; , that is, the diameter of the last lens/the diameter of the first lens&gt;1.

2. The optical lens device of image scanner according to claim 1 , wherein its characteristic further includes: the a ratio between the EFL and the image height is smaller than 0.9 (i.e., EFL/image height&lt;0.9).

3. The optical lens device of image scanner according to claim 1 , wherein its characteristic further includes: the a ratio between the BFL and the TT is smaller than 0.05 (i.e., BFL/TT&lt;0.05).

4. The optical lens device of image scanner according to claim 1 , wherein the plural lenses includes include four pieces of lens, and wherein the diaphragm is located between the a second lens and the a third lens of the plural lenses.

5. The optical lens device of image scanner according to claim 1 , wherein the plural lenses includes include three pieces of lens, and wherein the diaphragm is located between the first lens and the a second lens of the plural lenses.

6. The optical lens device of image scanner according to claim 1 , wherein the plural lenses includes include five pieces of lens, and wherein the diaphragm is located between the a second and the a third lens of the plural lenses.

7. The optical lens device of image scanner according to claim 1 , wherein the BFL&lt;10 mm.

8. The optical lens device of image scanner according to claim 1 , wherein, when the image induction element is comprises a charge coupled device (abbreviated as CCD) that has 4 μm pixel pitch, 600 dpi resolution, and is capable of scanning a maximum document in A4 size, then its and wherein the TT value is smaller than 200 mm.

9. The optical lens device of image scanner according to claim 1 , wherein, when the image induction element is a charge coupled device (abbreviated as CCD) that has 5.25 μm pixel pitch, 300 dpi resolution, and is capable of scanning a maximum document in A4 size, then its and wherein the TT value is smaller than 200 mm.

10. The optical lens device of image scanner according to claim 1 , wherein, when the image induction element is a charge coupled device (abbreviated as CCD) that has 4 μm pixel pitch, 600 dpi resolution, and is capable of scanning a maximum document in A3 size, then its and wherein the TT value is smaller than 280 mm.

11. The optical lens device of image scanner according to claim 1 , wherein, when the image induction element is a charge coupled device (abbreviate as CCD) that has 4 μm pixel pitch, 1200 dpi resolution, and is capable of scanning the a maximum document in A4 size its , wherein the TT value is smaller than 280 mm, wherein the BFL&lt;25 mm, and wherein BFL/TT&lt;0.1.

12. The optical lens device of image scanner according to claim 1 , wherein the plural lenses includes include four pieces of lens, and wherein the diaphragm is located in front of the plural lenses.

13. An image scanner having optical lens device comprising:
a scanning area, which may be available for supporting supports a document to be scanned;
a light source which may emit emits light to the scanning area for generating an optical image of the document;
a light-guiding device, which includes at least one piece of reflective mirror for making reflecting the optical image proceed at least once reflection and guides the reflected optical image toward a predetermined direction;
an optical lens device, which receives the optical image transferred reflected from the light-guiding device and focuses it into an image; and
an image induction element, which is just located at the a position corresponding to the place where the optical image is focused into an the image;
wherein, the optical lens device at least includes comprises:
a diaphragm and plural lenses, which wherein the plural lenses are arranged linearly with the diaphragm and the image induction element for defining an a fixed optical path between the document and the image induction element wherein, among the plural lenses, the one that a first lens is most close to the document is called the first lens , while the other one that wherein a last lens is most close to the image induction element is called the last lens , and the wherein a distance that is between the last lens and the image induction element is abbreviated as BFL, and the wherein a length, of the induced image, provided by the image induction element is called the an image height, and the wherein a distance between the document and the image induction element is abbreviated as TT, and the wherein an effective focus length of the optical lens device is abbreviated as EFL; and
wherein, the a ratio between the a diameter of the last lens of the optical lens device and the a diameter of the first lens is greater than one; that is, the diameter of the last lens/the diameter of the first lens&gt; 1 , and wherein BFL/TT&lt;0.05.

14. The image scanner having optical lens device according to claim 13 wherein its characteristic further includes: the a ratio between the EFL and the image height is smaller than 0.9 (i.e., EFL/image height&lt;0.9).

15. The image scanner having optical lens device according to claim 13 , wherein the plural lenses include at least includes four pieces of lens, and, wherein the diaphragm is located between the a second lens and the a third lens of the plural lenses.

16. The image scanner having optical lens device according to claim 13 , wherein the plural lenses include at least includes three pieces of lens, and, wherein the diaphragm is located between the first lens and the a second lens of the plural lenses.

17. The image scanner having optical lens device according to claim 13 , wherein BFL/TT&lt; is between 0 . 026 and 0.05.

18. The image scanner having optical lens device according to claim 13 , wherein BFL&lt;10 mm.

19. The image scanner having optical lens device according to claim 13 , wherein, when the image induction element is a charge coupled device (abbreviated as CCD) that has 4 μm pixel pitch, 600 dpi resolution, and is capable of scanning a maximum document in A4 size, then its and wherein the TT value is smaller than 200 mm.

20. The image scanner having optical lens device according to claim 13 , wherein, when the image induction element is a charge coupled device (abbreviated as CCD) that has 5.25 μm pixel pitch, 300 dpi resolution, and is capable of scanning a maximum document in A4 size, then its and wherein the TT value is smaller than 200 mm.

21. The image scanner having optical lens device according to claim 13 , wherein, when the image induction element is a charge coupled device (abbreviated as CCD) that has 4 μm pixel pitch, 600 dpi resolution, and is capable of scanning a maximum document in A3 size, then its and wherein the TT value is smaller than 280 mm.

22. The image scanner having optical lens device according to claim 13 , wherein, when the image induction element is a charge coupled device (abbreviate as CCD) that has 4 μm pixel pitch, 1200 dpi resolution, and is capable of scanning the a maximum document in A4 size, its wherein the TT value is smaller than 280 mm, wherein the BFL&lt;25 mm, and wherein BFL/TT&lt;0.1.

23. The image scanner having optical lens device according to claim 13 , wherein the plural lenses includes include five pieces of lens, and wherein the diaphragm is located between the a second lens and the a third lens of the plural lenses.

24. The image scanner having optical lens device according to claim 13 , wherein the plural lenses includes include four pieces of lens, and wherein the diaphragm is located in front of the plural lenses.

25. An apparatus, comprising:
a diaphragm; and two or more lenses arranged linearly with an image induction element and the diaphragm, wherein the two or more lenses define an optical path between a document and the image induction element, wherein the two or more lenses include a first lens and a last lens, wherein the first lens is located closest to the document of all the two or more lenses along the optical path, wherein the last lens is located closest to the image induction element of all the two or more lenses along the optical path, wherein the first lens is located on an opposite side of the diaphragm as the last lens, and wherein a distance between the last lens and the image induction element is between 10 mm and 4 . 84 mm.

26. The apparatus according to claim 25 , wherein a distance between the document and the image induction element is between 200 mm and 183 mm.

27. The apparatus according to claim 25 , wherein a ratio between an effective focus length of the apparatus and an image height is between 0 . 9 and 0 . 676 .

28. The apparatus according to claim 25 , wherein a ratio comprising a distance between the last lens and the image induction element and a distance between the document and the image induction element is between 0 . 05 and 0 . 026 .

29. The apparatus according to claim 25 , wherein the two or more lenses comprise four pieces of lens, and wherein the diaphragm is located between a second lens and a third lens.

30. The apparatus according to claim 25 , wherein the two or more lenses comprise three pieces of lens, and wherein the diaphragm is located between the first lens and a second lens.

31. The apparatus according to claim 25 , wherein the two or more lenses comprise five pieces of lens, and wherein the diaphragm is located between a second lens and a third lens.

32. The apparatus according to claim 25 , wherein the two or more lenses comprise four pieces of lens, and wherein the diaphragm is located between the document and the first lens.

33. The apparatus according to claim 25 , wherein a distance between the document and the image induction element is between 200 mm and 183 mm, and wherein a ratio of the distance between the last lens and the image induction element and the distance between the document and the image induction element is between 0 . 05 and 0 . 026 .

34. A system, comprising:
a diaphragm; a light source configured to emit light onto a document; an image induction element configured to convert an optical image of the document into electronic signals; and two or more lenses arranged linearly with the image induction element, wherein the two or more lenses define an optical path between the document and the image induction element, wherein the two or more lenses include a first lens and a last lens, wherein the first lens is located closest to the document of all the two or more lenses along the optical path, wherein the last lens is located closest to the image induction element of all the two or more lenses along the optical path, wherein the first lens is located on an opposite side of the diaphragm as the last lens, and wherein a distance between the document and the image induction element is less than 200 mm.

35. The system according to claim 34 , wherein a distance between the last lens and the image induction element is less than 10 mm.

36. The system according to claim 35 , wherein a ratio comprising the distance between the last lens and the image induction element and the distance between the document and the image induction element is less than 0 . 05 .

37. The system according to claim 35 , wherein a ratio between an effective focus length of the apparatus and an image height is less than 0 . 9 .

38. The system according to claim 34 , wherein a distance between the last lens and the image induction element is less than 10 mm, and wherein a ratio of the distance between the last lens and the image induction element and the distance between the document and the image induction element is less than 0 . 05 .

39. An apparatus, comprising:
means for receiving an optical image of a document, wherein the means for receiving includes two or more lenses arranged linearly with both a means for converting the optical image into electronic signals and a diaphragm, and wherein the means for receiving and the means for converting define an optical path between the document and the means for converting; wherein the two or more lenses include a first lens and a last lens, wherein the first lens is located closest to the document of all the two or more lenses along the optical path, wherein the last lens is located closest to the means for converting of all the two or more lenses along the optical path, and wherein the first lens is located on an opposite side of the diaphragm as the last lens; and means for focusing the optical image on the means for converting, wherein the means for focusing includes the last lens of the two or more lenses, and wherein a distance between the document and the means for converting is less than 200 mm.

40. The apparatus according to claim 39 , wherein a distance between the last lens and the means for converting is less than 10 mm.

41. The apparatus according to claim 40 , wherein a ratio of the distance between the last lens and the means for converting and the distance between the document and the means for converting is less than 0 . 05 .

42. An apparatus, comprising:
a diaphragm; and two or more lenses arranged linearly with an image induction element and the diaphragm, wherein the two or more lenses define an optical path between a document and the image induction element, wherein the two or more lenses include a first lens and a last lens, wherein the first lens is located closest to the document of all the two or more lenses along the optical path, wherein the last lens is located closest to the image induction element of all the two or more lenses along the optical path, wherein the first lens is located on an opposite side of the diaphragm as the last lens, and wherein a ratio of a distance between the last lens and the image induction element and a distance between the document and the image induction element is less than 0 . 05 .

43. The apparatus according to claim 42 , wherein the distance between the last lens and the image induction element is less than 10 mm.

44. The method according to claim 42 , wherein the distance between the document and the image induction element is less than 200 mm.

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