Image reading apparatus
According to one embodiment, an image reading apparatus includes a light emitting unit, a first carriage, a first photoelectric conversion unit, a first lens, and a second carriage. The light emitting unit irradiates a reading object with light. The first carriage includes a first optical member for guiding reflected light from the reading object. The first carriage is movable in a sub-scanning direction along the reading object. The first photoelectric conversion unit receives the reflected light from the reading object guided through the first optical member and outputs an image signal. The first lens is disposed on an optical path of the reflected light between the first optical member and the first photoelectric conversion unit, and images the reflected light from the reading object on the first photoelectric conversion unit. The second carriage is movable in a main scanning direction orthogonal to the sub-scanning direction along the reading object with respect to the first carriage. The second carriage includes a second optical member for guiding the reflected light from the reading object, a second photoelectric conversion unit that receives the reflected light from the reading object guided through the second optical member to output an image signal, and a second lens that is disposed on an optical path of the reflected light between the second optical member and the second photoelectric conversion unit and images the reflected light from the reading object on the second photoelectric conversion unit at a magnification different from the first lens.
1. An image reading apparatus, comprising:
a light emitting component configured to irradiate a reading object with light;
a first carriage including a first optical member for guiding reflected light from the reading object and provided movably in a sub-scanning direction along the reading object;
a first photoelectric conversion component configured to receive the reflected light from the reading object guided through the first optical member to output an image signal;
a first lens disposed on an optical path of the reflected light between the first optical member and the first photoelectric conversion component and configured to image the reflected light from the reading object on the first photoelectric conversion component; and
a second carriage including a second optical member provided movably in a main scanning direction orthogonal to the sub-scanning direction along the reading object with respect to the first carriage and guiding the reflected light from the reading object, a second photoelectric conversion component that receives the reflected light from the reading object guided through the second optical member to output an image signal, and a second lens disposed on an optical path of the reflected light between the second optical member and the second photoelectric conversion component and images the reflected light from the reading object on the second photoelectric conversion component at a magnification different from the first lens.
2. The image reading apparatus according to claim 1 , wherein
the light emitting component includes a first light emitting component provided on the first carriage and a second light emitting unit provided on the second carriage.
3. The image reading apparatus according to claim 2 , wherein
the second light emitting component has a shorter length in the main scanning direction than the first light emitting component.
4. The image reading apparatus according to claim 1 , wherein
the second carriage includes a moving member provided movably in the main scanning direction with respect to the first carriage.
5. The image reading apparatus according to claim 4 , further comprising:
a moving mechanism configured to move the moving member in the main scanning direction with respect to the first carriage.
6. The image reading apparatus according to claim 5 , wherein
in addition to the moving member, the second carriage includes the second optical member, the second photoelectric conversion component, and a second lens component to which the second lens is fixed.
7. The image reading apparatus according to claim 6 , wherein
the second lens component is rotatably attached to the moving member around a spindle orthogonal to the main scanning direction and the sub-scanning direction.
8. The image reading apparatus according to claim 7 , further comprising:
a rotating mechanism configured to rotate the second lens component around the spindle with respect to the moving member.
9. The image reading apparatus according to claim 1 , further comprising:
a mirror component including a mirror for reflecting the reflected light from the reading object guided through the first optical member toward the first photoelectric conversion component and configured to be interlocked with the first carriage to move in the sub-scanning direction.
10. The image reading apparatus according to claim 1 , further comprising:
a display component configured to simultaneously display an image based on the image signal output from the first photoelectric conversion component and an image based on the image signal output from the second photoelectric conversion component.
11. The image reading apparatus according to claim 1 , wherein
an optical path length between the reading object and the second lens is shorter than an optical path length between the reading object and the first lens.
12. An image reading method, comprising:
irradiating a reading object with light from a light emitting component;
guiding reflected light from the reading object by a first carriage including a first optical member provided movably in a sub-scanning direction along the reading object;
receiving the reflected light from the reading object guided through the first optical member to output an image signal by a first photoelectric conversion component;
imaging the reflected light from the reading object on the first photoelectric conversion component by a first lens disposed on an optical path of the reflected light between the first optical member and the first photoelectric conversion component;
guiding the reflected light from the reading object by a second optical member provided movably in a main scanning direction orthogonal to the sub-scanning direction in a second carriage along the reading object with respect to the first carriage;
receiving the reflected light from the reading object guided through the second optical member to output an image signal by a second photoelectric conversion component; and
imaging the reflected light from the reading object on the second photoelectric conversion component at a magnification different from the first lens by a second lens disposed on an optical path of the reflected light between the second optical member and the second photoelectric conversion component.
13. The image reading method according to claim 12 , further comprising:
moving a moving member in the main scanning direction with respect to the first carriage.
14. The image reading method according to claim 13 , further comprising:
a rotating mechanism configured to rotating the second lens component around a spindle with respect to the moving member.
15. The image reading method according to claim 12 , further comprising:
reflecting the reflected light from the reading object guided through the first optical member toward the first photoelectric conversion component.
16. The image reading method according to claim 12 , further comprising:
simultaneously displaying an image based on the image signal output from the first photoelectric conversion component and an image based on the image signal output from the second photoelectric conversion component.
17. The high resolution image reading apparatus according to claim 12 , wherein
an optical path length between the reading object and the second lens is shorter than an optical path length between the reading object and the first lens.
18. A high resolution image reading apparatus, comprising:
a light emitting component configured to irradiate a reading object with light;
a first carriage including a first optical member for guiding reflected light from the reading object and provided movably in a sub-scanning direction along the reading object;
a first photoelectric conversion component configured to receive the reflected light from the reading object guided through the first optical member to output an image signal;
a first lens disposed on an optical path of the reflected light between the first optical member and the first photoelectric conversion component and configured to image the reflected light from the reading object on the first photoelectric conversion component; and
a second carriage including a second optical member provided movably in a main scanning direction orthogonal to the sub-scanning direction along the reading object with respect to the first carriage and guiding the reflected light from the reading object, a second photoelectric conversion component that receives the reflected light from the reading object guided through the second optical member to output an image signal, and a second lens disposed on an optical path of the reflected light between the second optical member and the second photoelectric conversion component and images the reflected light from the reading object on the second photoelectric conversion component at a magnification greater than the first lens.
19. The high resolution image reading apparatus according to claim 18 , wherein
the light emitting component includes a first light emitting component provided on the first carriage and a second light emitting unit provided on the second carriage.
20. The high resolution image reading apparatus according to claim 19 , wherein
the second light emitting component has a shorter length in the main scanning direction than the first light emitting component.