Support structure for reflectors on half rate carriage
A support structure for supporting reflectors on a half rate carriage in an image reader has an angle between a reflecting surface of a second reflector and an optical path from a first reflector of a full rate carriage to the second reflector is greater than 45° and less than 90°, for example about 53°, and an angle between the reflecting surface of the second reflector and a reflector of a third reflector is 90°. Thus, the degree of overlaying of the full rate carriage with the half rate carriage is increased and the image reader is miniaturized.
1. An image reader having a full rate carriage on which a light source lamp and a first reflector are mounted and including a support structure for supporting reflectors on a half rate carriage on which a second reflector and a third reflector are mounted, said light source lamp for irradiating an original with light beams while moving said carriages along the original to read the reflected light beams as image data after reflecting said light beams on said first reflector, said second reflector, and said third reflector in sequence, wherein said support structure comprises:
said second reflector positioned such that an angle between a reflecting surface of said second reflector and an optical path from said first reflector to said second reflector is greater than 45° and less than 90°; and
said third reflector positioned such that an angle between the reflecting surface of said second reflector and a reflecting surface of said third reflector is 90°.
2. The support structure for supporting reflectors on a half rate carriage as defined in claim 1 , wherein the angle between the reflecting surface of said second reflector and the optical path from the first reflector to the second reflector is about 53°.
3. The support structure for supporting reflectors on a half rate carriage as defined in claim 2 , wherein a width of said second reflector is less than a width of said third reflector.
4. The support structure for supporting reflectors on a half rate carriage as defined in claim 1 , wherein a width of said second reflector is less than a width of said third reflector.
5. An image reader comprising:
a full rate carriage on which a light source lamp and a first reflector are mounted for irradiating an original with light beams from the light source lamp; and
a half rate carriage on which a second reflector and a third reflector are mounted to read the reflected light beams as image data while moving said full and half rate carriages along the original after reflecting the light beams on said first reflector, said second reflector, and said third reflector in sequence, wherein an angle between a reflecting surface of said second reflector and an optical path from said first reflector to said second reflector is greater than 45° and less than 90°, while the angle between the reflecting surface of said second reflector and a reflecting surface of said third reflector is 90°.
6. The image reader as defined in claim 5 , wherein the angle between the reflecting surface of said second reflector and the optical path from said first reflector to said second reflector is about 53°.
7. The image reader as defined in claim 6 , wherein a width of said second reflector is less than a width of said third reflector.
8. An image reader having a full rate carriage on which a light source lamp and a first reflector are mounted and including a support structure for supporting reflectors on a half rate carriage on which a second reflector and a third reflector are mounted for irradiating an original with light beams from said light source lamp while moving said carriages along the original to read the reflected light beams as image data after reflecting said light beams on said first reflector, said second reflector, and said third reflector in sequence, wherein the improvement comprises:
an angle between a reflecting surface of said second reflector and an optical path from said first reflector to said second reflector is greater than 45° and less than 90°, and an angle between the reflecting surface of said second reflector and a reflecting surface of said third reflector is 90°.
9. The support structure for supporting reflectors on a half rate carriage as defined in claim 8 , wherein the angle between the reflecting surface of the second reflector and the optical path from the first reflector to the second reflector is about 53°.
10. The support structure for supporting reflectors on a half rate carriage as defined in claim 9 , wherein a width of said second reflector is less than a width of said third reflector.
11. The support structure for supporting reflectors on a half rate carriage as defined in claim 8 , wherein a width of said second reflector is less than a width of said third reflector.