Optical scanner assembly for use in a laser imaging system

• US 5,883,658 A
• Filed: 09/29/1997
• Issued: 03/16/1999
• 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): Mathews, Alan A.
• Application Number:
  US08/939,944
• Time in Patent Office: 533 Days
• Field of Search: 347/241, 347/242, 347/243, 347/244, 347/256, 347/257, 347/258, 347/259, 347/262, 347/264, 359/205, 359/207, 358/491, 358/493, 355/47
• US Class Current: 347/258
• CPC Class Codes: B41J 11/04 Roller platens
• CPC Class Codes: B41J 2/471 using dot sequential main scanning by means of a light deflector, e.g. a rotating polygonal mirror
• CPC Class Codes: G02B 26/124 Details of the optical system between the light source and the polygonal mirror G02B26/123, G02B26/127 take precedence
• CPC Class Codes: G02B 26/125 Details of the optical system between the polygonal mirror and the image plane G02B26/123, G02B26/127 take precedence; F-Theta lenses G02B13/0005

Abstract

An optical scanner assembly for exposing an image on a photosensitive film. The photosensitive film is positioned on the internal surface of a drum. The optical scanner assembly includes a laser assembly for producing a laser beam representative of the image to be exposed on the photosensitive film, a scanner, and a long, flexible lens curved to the shape of the photosensitive film positioned on the internal surface of the drum, wherein the lens is positioned between the scanner and the film. The scanner operates to scan the laser beam through the lens across the surface of the photosensitive film in an image-wise pattern.

Claims

1. An optical scanner assembly for aiding in exposing an image on a photosensitive film positioned on the internal surface of a drum, the optical scanner assembly comprising:

a laser assembly for producing a laser beam representative of the image to be exposed on the photosensitive film;

a scanner; and

a long, flexible lens curved to the shape of the photosensitive film positioned on the internal surface of the drum, wherein the lens is positioned between the scanner and the film, and wherein the scanner operates to scan the laser beam through the lens across the surface of the photosensitive film in an image-wise pattern.

2. The scanner assembly of claim 1, wherein the lens is stationary relative to the photosensitive film.

3. The scanner assembly of claim 1, wherein the lens is curved in an arc of at least 180°

.

4. The scanner assembly of claim 3, wherein the scanner scans the laser beam in a 180°

arc through the flexible lens onto the surface of the photosensitive film.

5. The scanner assembly of claim 1, further comprising a guide mechanism for retaining the lens in a curved configuration.

6. The scanner assembly of claim 5, wherein the guide mechanism includes a groove in the shape of the curve, and wherein when the lens is placed in the groove, the groove imparts a curve to the lens.

7. The scanner assembly of claim 1, wherein the lens is a plano-convex cylinder lens.

8. The scanner assembly of claim 7, wherein the plano-convex cylinder lens has a convex side, and wherein the convex side faces the photosensitive film.

9. The scanner assembly of claim 1, wherein the curved lens is positioned proximate the midpoint between the scanner and the photosensitive film.

10. The scanner assembly of claim 1, wherein the scanner includes a rotatable mirror for directing the laser beam through the curved lens at the photosensitive film.

11. The scanner assembly of claim 10, wherein the mirror is a two sided mirror.

12. The scanner assembly of claim 1, wherein the long, flexible lens has a length corresponding to the arc length necessary for scanning a line across the photosensitive film.

13. The scanner assembly of claim 1, wherein the long, flexible lens exhibits diffraction limited optical characteristics, and maintains its diffraction limited optical characteristics when it is curved to the shape of the photosensitive film positioned on the internal surface of the drum.

14. An optical scanner assembly for exposing an image on a photosensitive film, wherein the photosensitive film is in the shape of a partial cylinder, the optical scanner assembly comprising:

a rotating scanner mirror; and

a thin, flexible lens positioned between the rotating scanner mirror and the photosensitive film, wherein the flexible lens is curved substantially parallel to the photosensitive film;

wherein the rotating scanner mirror operates to direct a light beam through the thin, flexible lens across the surface of the photosensitive film in an image-wise pattern.

15. The optical scanner assembly of claim 14, wherein the thin, flexible lens capable of being curved in at least a 180°

arc.

16. The optical scanner assembly of claim 14, wherein the thin, flexible lens is curved in a 180°

arc.

17. The optical scanner assembly of claim 14, wherein the rotating scanner mirror directs the laser beam in a 180°

arc through the thin, flexible lens incident onto the surface of the photosensitive film.

18. The optical scanner assembly of claim 14, wherein the scanner mirror is a two sided scanner mirror.

19. The optical scanner assembly of claim 14, further comprising a guide mechanism for maintaining the lens in a fixed position relative to the film.

20. The optical scanner assembly of claim 19, wherein the guide mechanism imparts the curve to the thin, flexible lens.

21. The optical scanner assembly of claim 20, wherein the guide mechanism includes a groove in the shape of the desired lens curve, wherein the groove is sized for receiving a longitudinally extending edge of the lens, and wherein when the lens is placed in the groove, the groove imparts the curve to the lens.

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

23. The optical scanner assembly of claim 22, wherein the plano-convex cylinder lens includes a convex side, and wherein the convex side faces the photosensitive film.

24. The optical scanner assembly of claim 14, wherein the relatively thin, flexible lens is positioned proximate the midpoint between the rotating scanner mirror and the photosensitive film.

25. The optical scanner assembly of claim 14, wherein the thin, flexible lens has a length corresponding to the arc length necessary for scanning a line across the photosensitive film.

26. The optical scanner assembly of claim 25, wherein the thin, flexible lens has a length of at least six inches.

27. The optical scanner assembly of claim 14, wherein the thin, flexible lens has a thickness of less than 0.02 inches.

28. The optical scanner assembly of claim 27, wherein the thin, flexible lens has a thickness of 0.01 inches.

29. An optical scanner assembly for exposing an image on a photosensitive film in an internal drum type scanner, wherein the photosensitive film is in the shape of a partial cylinder corresponding to the internal drum surface, the optical scanner assembly comprising:

a laser assembly for producing a laser beam representative of the image to be exposed on the photosensitive film;

a two sided, rotating scanner mirror; and

a thin, flexible cylinder lens positioned between the rotating scanner mirror and the photosensitive film, wherein the thin, flexible lens is capable of flexing in a 180°

arc, and wherein the thin, flexible cylinder lens is curved substantially parallel to the photosensitive film;

wherein the rotating scanner mirror operates to direct the laser beam through the thin, flexible cylinder lens across the surface of the photosensitive film in an image-wise pattern.

30. The optical scanner assembly of claim 29, wherein the thin, flexible cylinder lens is a plano-convex cylinder lens having a convex side which faces the photosensitive film.

31. The optical scanner assembly of claim 29, wherein the thin, flexible cylinder lens has a length corresponding to the arc length necessary for scanning a line across the photosensitive film.

32. The optical scanner assembly of claim 29, wherein the thin, flexible cylinder lens is at least 6 inches long.

33. The optical scanner assembly of claim 29, wherein the thin, flexible cylinder lens is tilted relative to the photosensitive film.

34. The optical scanner assembly of claim 29, further comprising a guide mechanism for maintaining the lens in a fixed position relative to the photosensitive film, when the guide mechanism imparts the curve to the thin, flexible cylinder lens.

35. The optical scanner assembly of claim 29, wherein the thin, flexible cylinder lens has a thickness of less than 0.02 inches.

36. The optical scanner assembly of claim 29, wherein the thin, flexible cylinder lens includes a thin, polymeric support substrate.

37. The optical scanner assembly of claim 29, wherein the thin, flexible cylinder lens includes a thin, polycarbonate support substrate.