Optical system for a scanner including a light source for illuminating a target area and a plurality of mirrors positioned to receive a light beam
View Patent ↗An optical system for a scanner according to one example embodiment includes a light source for illuminating a target area and a plurality of mirrors that includes a first mirror positioned to receive a light beam traveling along a first optical path and to reflect the beam along a second optical path. A second mirror receives the beam traveling along the second optical path and reflects the beam along a third optical path. A third mirror receives the beam traveling along the third optical path and reflects the beam along a fourth optical path. A fourth mirror receives the beam traveling along the fourth optical path and reflects the beam along a fifth optical path. A fifth mirror receives the beam traveling along the fifth optical path and reflects the beam along a sixth optical path. An image sensor receives the beam and senses an image of the target area.
1. An optical system for a scanner, comprising
a light source for illuminating a target area to be scanned;
a plurality of mirrors that includes:
a first mirror spaced vertically from the target area and positioned to receive a light beam traveling along a first optical path between the target area and the first mirror when the target area is illuminated by the light source and to reflect the light beam along a second optical path between the first mirror and a second mirror, the first mirror having a first incident surface that forms an angle of between about 149.5° and about 159.5° relative to the target area;
the second mirror being positioned to receive the light beam traveling along the second optical path and to reflect the light beam along a third optical path between the second mirror and a third mirror, the third optical path crossing the first optical path, the second mirror having a second incident surface that forms an angle of between about 100.4° and about 110.4° relative to the target area;
the third mirror being positioned to receive the light beam traveling along the third optical path and to reflect the light beam along a fourth optical path between the third mirror and a fourth mirror, the fourth optical path crossing the first optical path, the third mirror having a third incident surface that forms an angle of between about 80.9° and about 90.9° relative to the target area;
the fourth mirror being positioned to receive the light beam traveling along the fourth optical path and to reflect the light beam along a fifth optical path between the fourth mirror and a fifth mirror, the fifth optical path crossing the second and third optical paths, the fourth mirror having a fourth incident surface that forms an angle of between about 130.0° and about 140.0° relative to the target area; and
the fifth mirror being positioned to receive the light beam traveling along the fifth optical path and to reflect the light beam along a sixth optical path between the fifth mirror and an image sensor, the sixth optical path crossing the first and second optical paths, the fifth mirror having a fifth incident surface that forms an angle of between about 40.0° and about 50.0° relative to the target area; and
the image sensor being positioned to receive the light beam traveling along the sixth optical path and to sense an image of the target area, the image sensor having a sixth incident surface that forms an angle of between about 85.0° and about 95.0° relative to the target area.
2. The optical system of claim 1 , wherein the first optical path is substantially parallel to the fifth optical path.
3. The optical system of claim 1 , wherein the fourth optical path is substantially parallel to the sixth optical path.
4. The optical system of claim 1 , wherein the first optical path is substantially perpendicular to the fourth optical path.
5. The optical system of claim 1 , wherein the first optical path is substantially perpendicular to the sixth optical path.
6. The optical system of claim 1 , wherein the fifth optical path is substantially perpendicular to the fourth optical path.
7. The optical system of claim 1 , wherein the fifth optical path is substantially perpendicular to the sixth optical path.
8. The optical system of claim 1 , wherein the first mirror is positioned vertically furthest from the target area among the plurality of mirrors.
9. The optical system of claim 1 , wherein the fourth mirror is narrower than the first and second mirrors.
10. The optical system of claim 1 , wherein the first, second, fourth and fifth mirrors are mounted on a common bracket.
11. The optical system of claim 10 , wherein the common bracket is positioned within a housing and the third mirror is mounted on a second bracket that is disposed on an opposite side of the housing from the common bracket.
12. The optical system of claim 1 , wherein the third mirror is adjustably positioned relative the remaining plurality of mirrors.
13. The optical system of claim 1 , wherein a length of the first optical path is between 36.0 mm and about 46.0 mm, a length of the second optical path is between about 18.0 mm and about 28.0 mm, a length of the third optical path is between about 42.1 mm and about 62.1 mm, a length of the fourth optical path is between about 37.1 mm and about 57.1 mm, a length of the fifth optical path is between about 11.6 mm and 21.6 mm, and a length of the sixth optical path is between about 51.2 mm and about 61.2 mm.
14. The optical system of claim 1 , wherein:
the first incident surface forms an angle of about 154.5° relative to the target area;
the second incident surface forms an angle of about 105.4° relative to the target area;
the third incident surface forms an angle of about 85.9° relative to the target area;
the fourth incident surface forms an angle of about 135.0° relative to the target area;
the fifth incident surface forms an angle of about 45.0° relative to the target area; and
the sixth incident surface forms an angle of about 90.0° relative to the target area.
15. An optical system for a scanner, comprising:
a light source for illuminating a target area to be scanned;
a plurality of mirrors that includes:
a first mirror spaced vertically from the target area and positioned to receive a light beam traveling along a first optical path between the target area and the first mirror when the target area is illuminated by the light source and to reflect the light beam along a second optical path between the first mirror and a second mirror, the first mirror having a first incident surface that forms an angle of between about 149.5° and about 159.5° relative to the target area;
the second mirror being positioned to receive the light beam traveling along the second optical path and to reflect the light beam along a third optical path between the second mirror and a third mirror, the third optical path crossing the first optical path, the second mirror having a second incident surface that forms an angle of between about 100.4° and about 110.4° relative to the target area;
the third mirror being positioned to receive the light beam traveling along the third optical path and to reflect the light beam along a fourth optical path between the third mirror and a fourth mirror, the fourth optical path crossing the first optical path and being substantially perpendicular to the first optical path, the third mirror having a third incident surface that forms an angle of between about 80.9° and about 90.9° relative to the target area;
the fourth mirror being positioned to receive the light beam traveling along the fourth optical path and to reflect the light beam along a fifth optical path between the fourth mirror and a fifth mirror, the fifth optical path crossing the second and third optical paths and being substantially parallel to the first optical path and substantially perpendicular to the fourth optical path, the fourth mirror having a fourth incident surface that forms an angle of between about 130.0° and about 140.0° relative to the target area; and
the fifth mirror being positioned to receive the light beam traveling along the fifth optical path and to reflect the light beam along a sixth optical path between the fifth mirror and an image sensor, the sixth optical path crossing the first and second optical paths and being substantially parallel to the fourth optical path and substantially perpendicular to the first and fifth optical paths, the fifth mirror having a fifth incident surface that forms an angle of between about 40.0° and about 50.0° relative to the target area; and
the image sensor being positioned to receive the light beam traveling along the sixth optical path and to sense an image of the target area, the image sensor having a sixth incident surface that forms an angle of between about 85.0° and about 95.0° relative to the target area.
16. The optical system of claim 15 , wherein a length of the first optical path is between 36.0 mm and about 46.0 mm, a length of the second optical path is between about 18.0 mm and about 28.0 mm, a length of the third optical path is between about 42.1 mm and about 62.1 mm, a length of the fourth optical path is between about 37.1 mm and about 57.1 mm, a length of the fifth optical path is between about 11.6 mm and 21.6 mm, and a length of the sixth optical path is between about 51.2 mm and about 61.2 mm.
17. An optical system for a scanner, comprising
a light source for illuminating a target area to be scanned;
a plurality of mirrors that includes:
a first mirror spaced vertically from the target area and positioned to receive a light beam traveling along a first optical path between the target area and the first mirror when the target area is illuminated by the light source and to reflect the light beam along a second optical path between the first mirror and a second mirror, the first mirror having a first incident surface that forms an angle of between about 149.5° and about 159.5° relative to the target area;
the second mirror being positioned to receive the light beam traveling along the second optical path and to reflect the light beam along a third optical path between the second mirror and a third mirror, the second mirror having a second incident surface that forms an angle of between about 100.4° and about 110.4° relative to the target area;
the third mirror being positioned to receive the light beam traveling along the third optical path and to reflect the light beam along a fourth optical path between the third mirror and a fourth mirror, the third mirror having a third incident surface that forms an angle of between about 80.9° and about 90.9° relative to the target area;
the fourth mirror being positioned to receive the light beam traveling along the fourth optical path and to reflect the light beam along a fifth optical path between the fourth mirror and a fifth mirror, the fourth mirror having a fourth incident surface that forms an angle of between about 130.0° and about 140.0° relative to the target area; and
the fifth mirror being positioned to receive the light beam traveling along the fifth optical path and to reflect the light beam along a sixth optical path between the fifth mirror and an image sensor, the fifth mirror having a fifth incident surface that forms an angle of between about 40.0° and about 50.0° relative to the target area; and
the image sensor being positioned to receive the light beam traveling along the sixth optical path and to sense an image of the target area, the image sensor having a sixth incident surface that forms an angle of between about 85.0° and about 95.0° relative to the target area,
wherein the first mirror is positioned vertically furthest from the target area among the plurality of mirrors.
18. The optical assembly of claim 17 , wherein the first optical path is substantially parallel to the fifth optical path, the fourth optical path is substantially parallel to the sixth optical path, and the first and fifth optical paths are substantially perpendicular to the fourth and sixth optical paths.