Optical configuration for an optical scanner system

• US 5,933,268 A
• Filed: 09/29/1997
• Issued: 08/03/1999
• Est. Priority Date: 09/29/1997
• Status: Expired due to Fees

• Current Assignee: CareStream Health Incorporated
• Original Assignee: Imation Corporation (Glassbridge Enterprises, Inc.)
• Inventors: Schubert, Paul C., Li, Yun Zhong
• Primary Examiner(s): Phan, James
• Application Number:
  US08/939,308
• Time in Patent Office: 673 Days
• Field of Search: 359/205-207, 359/212-216, 359/710, 347/258, 358/493, 358/490-491
• US Class Current: 359/207.1
• CPC Class Codes: G02B 26/10 Scanning systems
• CPC Class Codes: H04N 1/0607 Scanning a concave surface, e.g. with internal drum type scanners H04N1/0657 takes precedence
• CPC Class Codes: H04N 1/0635 using oscillating or rotating mirrors

Abstract

An optical assembly for use in focusing a laser beam along an optical path onto a scanned surface. The optical assembly includes a first cylinder lens having a longitudinal axis and a transverse axis, located along the optical path for shaping and focusing the laser beam in a first direction, wherein the transverse axis is substantially perpendicular to the optical path. A second cylinder lens is provided having a longitudinal axis and a transverse axis, located along the optical path for shaping and focusing the laser beam in a second direction, wherein the transverse axis is substantially perpendicular to the optical path. The second cylinder lens longitudinal axis is not perpendicular to the optical path.

Claims

1. An optical assembly for use in focusing a laser beam along an optical path onto a scanned surface, the optical assembly comprising:

a first cylinder lens having a longitudinal axis and a transverse axis, located along the optical path for shaping and focusing the laser beam in a first direction wherein the transverse axis is substantially perpendicular to the optical path;

a second cylinder lens having a longitudinal axis and a transverse axis located along the optical path for shaping and focusing the laser beam in a second direction, wherein the transverse axis is substantially perpendicular to the optical path, wherein the second cylinder lens longitudinal axis is not perpendicular to the optical path; and

a light absorbing surface, wherein the laser beam includes a scanning portion which passes through the second cylinder lens, and a reflected portion which does not pass through the second cylinder lens, wherein the second cylinder lens longitudinal axis is angled relative to the optical path such that the reflected portion is directed to the light absorbing surface.

2. The optical assembly of claim 1, wherein the second cylinder lens includes a flat surface and convex surface, and wherein the reflected portion includes a first reflected beam reflecting from the flat surface and a second reflected beam reflecting from the convex surface.

3. An optical assembly for use in focusing a laser beam along an optical path onto a scanned surface, the optical assembly comprising:

a first cylinder lens having a longitudinal axis and a transverse axis, located along the optical path for shaping and focusing the laser beam in a first direction, wherein the transverse axis is substantially perpendicular to the optical path; and

a second cylinder lens having a longitudinal axis and a transverse axis, located along the optical path for shaping and focusing the laser beam in a second direction, wherein the transverse axis is substantially perpendicular to the optical path, and wherein the second cylinder lens longitudinal axis is not perpendicular to the optical path, wherein the second cylinder lens is a plano-convex cylinder lens, and wherein the plano-convex cylinder lens includes a flat surface and a convex surface, and wherein the convex surface faces the scanned surface.

4. An optical assembly for use in focusing a laser beam along an optical path onto a scanned surface, the optical assembly comprising:

a first cylinder lens having a longitudinal axis and a transverse axis, located along the optical path for shaping and focusing the laser beam in a first direction, wherein the transverse axis is substantially perpendicular to the optical path; and

a second cylinder lens having a longitudinal axis and a transverse axis, located along the optical path for shaping and focusing the laser beam in a second direction, wherein the transverse axis is substantially perpendicular to the optical path, wherein the second cylinder lens longitudinal axis is not perpendicular to the optical path, and wherein the focal length of the second cylinder lens is adjusted by rotating the second cylinder lens about the second cylinder lens transverse axis, thereby changing the angle between the longitudinal axis and the optical path.

5. The optical assembly of claim 4, further comprising a mechanism for adjusting the angle between the longitudinal axis and the optical path.

6. The optical assembly of claim 4, further comprising a mechanism for rotating the second cylinder lens about the second cylinder lens transverse axis.

7. The optical assembly of claim 4, wherein when the focal length of second cylinder lens is adjusted, the transverse axis remains stationary.

8. An optical assembly for use in focusing a laser beam along an optical path onto a scanned surface, the optical assembly comprising:

a first cylinder lens having a longitudinal axis and a transverse axis, located along the optical path for shaping and focusing the laser beam in a first direction, wherein the transverse axis is substantially perpendicular to the optical path; and

a second cylinder lens having a longitudinal axis and a transverse axis, located along the optical path for shaping and focusing the laser beam in a second direction, wherein the transverse axis is substantially perpendicular to the optical path; and

wherein the second cylinder lens longitudinal axis is not perpendicular to the optical path, and wherein the first cylinder lens longitudinal axis is not perpendicular to the optical path.

9. The optical assembly of claim 8, wherein the laser beam includes a scanning portion which passes through the first cylinder lens, and a reflected portion which does not pass through the first cylinder lens, wherein the first cylinder lens longitudinal axis is angled relative to the optical path such that the reflected portion is directed to a desired surface.

10. An optical assembly for use in focusing a laser beam along an optical path onto a scanned surface, the optical assembly comprising:

a first cylinder lens having a longitudinal axis and a transverse axis, located along the optical path for shaping and focusing the laser beam in a first direction, wherein the transverse axis is substantially perpendicular to the optical path; and

a second cylinder lens having a longitudinal axis and a transverse axis, located along the optical path for shaping and focusing the laser beam in a second direction, wherein the transverse axis is substantially perpendicular to the optical path;

and wherein the second cylinder lens longitudinal axis is not perpendicular to the optical path, and wherein the second cylinder lens includes a first layer and a second layer, wherein the second layer is constructed of a polymeric material.

11. The optical assembly of claim 10, wherein the polymeric material is a photopolymer.

12. The optical assembly of claim 10, wherein the first layer is made of a polymeric material.

13. The optical assembly of claim 10, wherein the first layer is made of glass.

14. An optical scanner apparatus for exposing an image on a photosensitive film comprising:

a laser assembly which produces a laser beam representative of the image exposed on the photosensitive film;

a scanning and directing system for scanning and directing the laser beam in an image-wise pattern across the photosensitive film; and

a beam shaping system for focusing the laser beam along an optical path onto a scanned surface, the beam shaping system including a first cylinder lens having a longitudinal axis and a transverse axis, located along the optical path for shaping and focusing the laser beam in a first direction, wherein the transverse axis is substantially perpendicular to the optical path, a second cylinder lens having a longitudinal axis and a transverse axis, located along the optical path for shaping and focusing the laser beam in a second direction, wherein the transverse axis is substantially perpendicular to the optical path and to the first lens transverse axis, and the second cylinder lens longitudinal axis is not perpendicular to the optical path, and further wherein the second cylinder lens is rotatable about its transverse axis, thereby changing the angle between the longitudinal axis and the optical path for adjusting the focal length of the second cylinder lens.

15. The optical assembly of claim 14, wherein the second cylinder lens does not have an anti-reflective coating.

16. The optical assembly of claim 14, further comprising a light absorbing surface, wherein the laser beam includes a scanning portion which passes through the second cylinder lens, and a reflected portion which does not pass through the second cylinder lens, wherein the second cylinder lens longitudinal axis is angled relative to the optical path such that the reflected portion is directed to the light absorbing surface.

17. The optical assembly of claim 14, wherein the second cylinder lens is a plano-convex cylinder lens.

18. The optical assembly of claim 17, wherein the second cylinder lens includes a flat surface and curved surface, and wherein the reflected portion includes a first reflected beam reflecting from the flat surface and second reflected beam reflecting from the curved surface.

19. The optical assembly of claim 18, wherein the plano-convex cylinder lens includes a flat surface and a convex surface, and wherein the convex surface faces the scanned surface.

20. The optical assembly of claim 14, wherein the second cylinder lens focuses the laser beam in the second direction onto the scanned surface, such that the distance between the second cylinder lens and the scanned surface is substantially equal to the focal length of the lens.

21. The optical assembly of claim 14, wherein the first cylinder lens longitudinal axis is not perpendicular to the optical path.

22. The optical assembly of claim 21, wherein the laser beam includes a scanning portion which passes through the first cylinder lens, and a reflected portion which does not pass through the first cylinder lens, wherein the first cylinder lens longitudinal axis is angled relative to the optical path such that the reflected portion is directed to a desired surface.

23. The optical assembly of claim 14, wherein the first cylinder lens includes a first layer and a second layer, wherein the second layer is constructed of a polymeric material.

24. The optical assembly of claim 23, wherein the polymeric material is a photopolymer.

25. The optical assembly of claim 23, wherein the first layer is made of a polymeric material.

26. The optical assembly of claim 23, wherein the first layer is made of glass.

27. An optical scanner apparatus for exposing an image on a photosensitive film in an internal drum type scanner system, the optical scanner apparatus comprising:

a laser assembly which produces a laser beam representative of the image exposed on the photosensitive film;

a scanning and directing system for scanning and directing the laser beam in an image-wise pattern across the photosensitive film, including a scanner mechanism having a two-sided rotating scanner mirror positioned thereon; and

a beam shaping system for focusing the laser beam along an optical path onto a scanned surface, the beam shaping system including a first cylinder lens, the first cylinder lens having a longitudinal axis and a transverse axis located along the optical path for shaping and focusing the laser beam in a first direction, wherein the transverse axis is substantially perpendicular to the optical path, a second cylinder lens having a longitudinal axis and a transverse axis, located along the optical path for shaping and focusing the laser beam in a second direction, wherein the transverse axis is substantially perpendicular to the optical path, and a third cylinder lens located along the optical path, wherein the second cylinder lens transverse axis is oriented substantially perpendicular to the first cylinder lens transverse axis, and the third cylinder lens is located between the scanner mirror and the photosensitive film, wherein the third cylinder lens operates in combination with the first cylinder lens and is located along the optical path for shaping and focusing the laser beam in the first direction, and wherein the second cylinder lens longitudinal axis is not perpendicular to the optical path.