LINE SENSOR AND IMAGE INFORMATION READING APPARATUS

Abstract

A line sensor, includes a plurality of pixels which is arranged linearly, the number of the plurality of pixels including the number depending on a resolution, a first pixel group which is provided to a center portion of the plurality of pixels arranged linearly and has a pixel pitch shorter than a length corresponding to a pixel pitch calculated from the resolution, and a second pixel group which is provided to each of both side portions of the center portion, and has a pixel pitch longer than the length corresponding to the pixel pitch calculated from the resolution.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements.

FIG. 1 is a structural view showing a configuration of an image information reading apparatus according to a first embodiment of the invention.

FIG. 2 is a schematic cross-sectional view explaining a reading mechanism of the image information reading apparatus shown in FIG. 1.

FIG. 3 is a schematic plan view of a line sensor chip according to the first embodiment.

FIG. 4 is an explanatory diagram of an interval between pixels of the line sensor chip according to the first embodiment.

FIG. 5 is a diagram explaining a gap between two line sensor chips adjacent to each other.

FIG. 6 is a diagram explaining a first modified example of the line sensor chip according to the first embodiment.

FIG. 7 is a diagram explaining a second modified example of the line sensor chip according to the first embodiment.

FIG. 8 is a diagram explaining a third modified example of the line sensor chip according to the first embodiment.

FIG. 9 is a diagram explaining a forth modified example of the line sensor chip according to the first embodiment.

FIG. 10 is a schematic plan view of the line sensor chip according to a second embodiment.

FIG. 11 is a diagram explaining a modified example of the line sensor chip according to the second embodiment.

Claims

1. A line sensor, comprising: a plurality of pixels which is arranged linearly, the number of the plurality of pixels including the number depending on a resolution;a first pixel group which is provided to a center portion of the plurality of pixels arranged linearly and has a pixel pitch shorter than a length corresponding to a pixel pitch calculated from the resolution; anda second pixel group which is provided to each of both side portions of the center portion, and has a pixel pitch longer than the length corresponding to the pixel pitch calculated from the resolution.

2. The line sensor according to claim 1, wherein the number of the plurality of pixels is equal to the number depending on the resolution.

3. The line sensor according to claim 1, further comprising: a third pixel group which is provided between the center portion and each of the both side portions, and has a pixel pitch equal to the length corresponding to the pixel pitch calculated from the resolution.

4. The line sensor according to claim 1, further comprising: a third pixel group which is provided between the center portion and each of the both side portions, and has a pixel pitch shorter than the length corresponding to the pixel pitch calculated from the resolution and longer than a length corresponding to the pixel pitch of the center portion.

5. The line sensor according to claim 1, further comprising: a third pixel group which is provided between the center portion and each of the both side portions, and has a pixel pitch longer than the length corresponding to the pixel pitch calculated from the resolution and shorter than a length of the pixel pitch of the both side portions.

6. A line sensor, comprising: a plurality of pixels which is arranged linearly, the number of the plurality of pixels including the number depending on a resolution, wherein the plurality of pixels are arranged linearly so that a pixel pitch is gradually increased from a center portion of the pixels arranged toward both end portions thereof.

7. The line sensor according to claim 6, wherein the pixel pitch is changed continuously from the center portion toward the both end portions so as to be increased gradually.

8. The line sensor according to claim 6, wherein the pixel pitch is changed stepwise from the center portion toward the both end potions so as to be increased gradually.

9. A line sensor, comprising: a plurality of pixels which is arranged linearly, the number of the plurality of pixels including the number depending on a resolution;a first pixel group which is provided to a center portion of the plurality of pixels arranged linearly and has a pixel pitch longer than a length corresponding to a pixel pitch calculated from the resolution; anda second pixel group which is provided to each of both side portions of the center portion, and has a pixel pitch equal to the length corresponding to the pixel pitch calculated from the resolution.

10. The line sensor according to claim 6, further comprising: a third pixel group which is provided between the center portion and each of the both side portions, and has a pixel pitch shorter than the length corresponding to the pixel pitch calculated from the resolution and longer than a length of the pixel pitch of the center portion.

11. An image information reading apparatus comprising a line sensor according to claim 1.