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Image reading apparatus and illuminator used for the same

Imported: 23 Feb '17 | Published: 22 Oct '02

Hiroaki Onishi, Hisayoshi Fujimoto, Norihiro Imamura

USPTO - Utility Patents

Abstract

An image reading apparatus is provided for reading out images printed on a document. The apparatus includes a casing elongated in the primary scanning direction and a transparent cover supported by the casing. In image-reading operation, the cover is held in sliding contact with a document at an image reading line. The apparatus further includes an insulating substrate attached to the casing, light sources for illuminating the image reading line, light sensors for receiving reflected light coming from the image reading line and a luminosity adjuster supported by the casing for equalizing luminosity along the image reading line.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

In the accompanying drawings:

FIG. 1 is an explosive, perspective view showing an image reading apparatus according to a first embodiment of the present invention;

FIG. 2 is a plan view showing principal parts of the image reading apparatus of FIG. 1;

FIG. 3 is a sectional view taken along lines III—III in FIG. 2;

FIG. 4 is a sectional view taken along lines IV—IV in FIG. 2;

FIG. 5 is a sectional view taken along lines V—V in FIG. 2;

FIG. 6 is a plan view showing principal parts of an image reading apparatus according to a second embodiment of the present invention;

FIG. 7 is a plan view showing principal parts of an image reading apparatus according to a third embodiment of the present invention;

FIG. 8 is a sectional view showing principal parts of an image reading apparatus according to a fourth embodiment of the present invention;

FIG. 9 is a sectional view showing an image reading apparatus according to a fifth embodiment of the present invention;

FIG. 10 is a different sectional view showing the image reading apparatus of the fifth embodiment;

FIG. 11 is a perspective view showing a luminosity-adjusting member used in the image reading apparatus of the fifth embodiment;

FIG. 12 is a perspective view showing another luminosity-adjusting member used in the image reading apparatus of the fifth embodiment;

FIG. 13 is a plan view showing principal parts of an image reading apparatus according to a sixth embodiment of the present invention;

FIG. 14 is a sectional view taken along lines XIV—XIV in FIG. 13;

FIG. 15 is a sectional view taken along lines XV—XV in FIG. 13;

FIG. 16 is a plan view showing principal parts of an image reading apparatus according to a seventh embodiment of the present invention;

FIG. 17 is a plan view showing principal parts of an image reading apparatus according to an eighth embodiment of the present invention;

FIG. 18 is an explosive, perspective view showing an image reading apparatus according to a ninth embodiment of the present invention;

FIG. 19 is a sectional view showing the image reading apparatus of the ninth embodiment;

FIG. 20 is a sectional view taken along lines XX—XX in FIG. 19;

FIG. 21 is a sectional view taken along lines XXI—XXI in FIG. 20;

FIG. 22 is a sectional view taken along lines XXII—XXII in FIG. 20;

FIG. 23 is a sectional view showing a conventional image reading apparatus;

FIG. 24 is a plan view showing arrangements of a substrate used in the conventional image reading apparatus; and

FIG. 25 illustrates how luminosity varies along the reading line of the conventional image reading apparatus.

Claims

1. An image reading apparatus for reading out images printed on a document comprising:

2. The image reading apparatus according to claim 1, wherein the luminosity-adjusting means includes an additional luminosity adjuster for shielding part of light emitted from the light sources, the additional luminosity adjuster is arranged below said one luminosity adjuster.

3. The image reading apparatus according to claim 1, wherein said each of the protrusions has a triangular configuration.

4. The image reading apparatus according to claim 1, wherein the luminosity-adjusting means is formed integrally with the casing.

5. The image reading apparatus according to claim 1, wherein the luminosity-adjusting means is formed separately from the casing.

6. An image reading apparatus for reading out images printed on a document comprising:

7. An image reading apparatus for reading out images printed on a document comprising:

8. The image reading apparatus according to claim 7, wherein each of the first reflective partitions has a reflectance of 90-98%.

9. The image reading apparatus according to claim 7, wherein the luminosity-adjusting means further includes a plurality of second reflective partitions, each of the second reflective partitions being disposed above a corresponding one of the light sources.

10. The image reading apparatus according to claim 9, wherein said each of the second reflective partitions has a bottom surface spaced from said corresponding one of the light sources by a predetermined distance.

11. The image reading apparatus according to claim 10, wherein the bottom surface of said each of the second reflective partitions has a reflectance of 90-98%.

12. An illuminator comprising:

13. The illuminator according to claim 12, wherein said each of the first reflective partitions has a reflectance of 90-98%.