Apparatus with laminated diffuser for illuminating medical diagnostic imaging film

• US 5,992,066 A
• Filed: 04/21/1997
• Issued: 11/30/1999
• Est. Priority Date: 04/21/1997
• Status: Expired due to Fees

• Current Assignee: William R. Brauer
• Original Assignee: William R. Brauer
• Inventors: Brauer, William R.
• Primary Examiner(s): GREEN, BRIAN
• Application Number:
  US08/757,265
• Time in Patent Office: 953 Days
• Field of Search: 40/361, 40/362, 40/366, 40/367, 40/564, 40/577, 362/97, 362/330, 362/331, 359/641
• US Class Current: 40/361
• CPC Class Codes: G02B 27/024 comprising a light source, e.g. for viewing photographic slides, X-ray transparancies G02B27/023, and photographic, cine and overhead projectors G03B21/00 and subgroups
• CPC Class Codes: G02B 5/0242 by means of dispersed particles
• CPC Class Codes: G02B 5/0278 used in transmission
• CPC Class Codes: G02B 5/0294 adapted to provide an additional optical effect, e.g. anti-reflection or filter
• CPC Class Codes: G02B 5/045 Prism arrays

Abstract

Apparatus for illuminating medical diagnostic imaging film comprises a light source for projecting light toward the imaging film, and a plurality of light diffusion film layers positioned in close adjacent relationship with one another, between the imaging film and the light source. Each of the diffusion film layers has a specified index of refraction, and the diffusion layers collectively act to scatter the projected light. An optical adhesive having an index of refraction which is substantially equal to the diffusion film index of refraction is positioned between respective adjacent surfaces thereof to substantially eliminate air-filled spaces therebetween, and to bond the film diffusion layers together into a unitary light diffusion structure. A plurality of layers of microprism film are positioned between the light diffusion film and the imaging film for redirecting at least a portion of the scattered light into a beam of collimated light directed to illuminate the imaging film.

Claims

1. Illuminating apparatus comprising:

medical diagnostic imaging film;

a light source for projecting light toward said imaging film;

a plurality of light diffusion film layers positioned in close adjacent relationship with one another between said imaging film and said light source, each of said diffusion film layers having a specified index of refraction, and said diffusion film layers collectively acting to scatter said projected light;

an optical transfer adhesive having an index of refraction which is substantially equal to said specified index of refraction positioned between respective adjacent surfaces of said diffusion film layers to substantially eliminate air-filled spaces therebetween, and to bond said diffusion film layers together into a unitary light diffusion structure; and

collimating means positioned between said light diffusion structure and said imaging film for redirecting at least a portion of said scattered light into a beam of collimated light directed toward said imaging film.

2. The apparatus of claim 1 wherein:

said collimating means comprises a layer of a collimating film in close adjacent relationship with a specified one of said diffusion film layers; and

a layer of said optical adhesive is positioned between said layer of collimating film and said specified diffusion film layer.

3. The apparatus of claim 1 wherein:

said collimating means comprises a plurality of layers of collimating film in close adjacent relationship with one another; and

a specified adhesive means is positioned around respective outer edges of said layers of collimating film to join said layers of collimating film to one another.

4. The apparatus of claim 3 wherein:

each of said layers of collimating film comprises a layer of microprism film, each having microscopic prism elements formed therein.

5. The apparatus of claim 4 wherein:

each of said layers of microprism film comprises a number of parallel rows of microscopic prism elements, the rows of microscopic prism elements of one of said layers of microprism film being oriented in non-parallel relationship with the rows of microscopic prism elements of another one of said layers of microprism film.

6. The apparatus of claim 5 wherein:

said apparatus comprises first and second layers of said microprism film, rows of said first and second layers of said microprism film being oriented in orthogonal relationship with each other.

7. The apparatus of claim 6 wherein:

said layers of microprism film and said diffusion film layers collectively form a laminated light processing package having first and second end surfaces in opposing relationship, said first end surface comprising a surface of one of said layers of microprism film, and said second end surface comprising a surface of one of said light diffusion film layers; and

said apparatus further includes first and second transparent protective layers selectively bonded to said first and second end surfaces, respectively.

8. The apparatus of claim 7 wherein:

said light processing package is selectively curved to focus said beam of collimated light to a specified focal point after passing through said imaging film.

9. The apparatus of claim 8 wherein:

said light processing package is curved to lie along a section of a circle of selected radius.

10. Illuminating apparatus comprising:

medical diagnostic imaging film;

a light source for projecting light toward said imaging film;

a light diffusion structure positioned with respect to said light source for scattering said projected light;

collimating film positioned to redirect at least a portion of said scattered light into a beam of collimated light directed to pass through said imaging film; and

a frame disposed to support said imaging film and said collimating film, and to selectively curve said collimating film so that said curved collimating film focuses said collimated light to a specified focal point.

11. The apparatus of claim 10 wherein said diffusion structure comprises:

a plurality of light diffusion film layers positioned in close adjacent relationship with one another, each of said diffusion film layers having a specified index of refraction, and collectively acting to scatter said projected light; and

an optical transfer adhesive having an index of refraction which is substantially equal to said specified index of refraction positioned between respective adjacent surfaces of said diffusion film layers to substantially eliminate air-filled spaces therebetween, and to bond said film diffusion layers together.

12. The apparatus of claim 10 wherein:

said collimating film comprises at least one layer of microprism film having microscopic prism elements formed therein.

13. The apparatus of claim 10 wherein:

said imaging film and said collimating film are curved by said frame to lie on a section of a hypothetical circle.

14. The apparatus of claim 10 wherein:

said collimating film comprises a plurality of layers of microprism film, each having microscopic prism elements formed therein.

15. The apparatus of claim 10 wherein:

said frame is disposed to hold said imaging film in close abutting relationship with said collimating film.

16. Apparatus for illuminating medical diagnostic imaging film comprising:

a light source for projecting light in a specified direction;

means selectively positioned with respect to said light source for scattering said projected light;

collimating film disposed to receive at least a portion of said scattered light, and to redirect said received portion into a beam of collimated light; and

a frame disposed to support said imaging film with respect to said collimating film so that said collimated light passes through said imaging film, said frame being further disposed to selectively curve said collimating film so that said curved collimating film focuses said collimated light to a specified focal point.

17. The apparatus of claim 16 wherein:

said collimating film comprises at least one layer of microprism film having microscopic prism elements formed therein.

18. The apparatus of claim 16 wherein:

said collimating film comprises a plurality of layers of microprism film, each having microscopic prism elements formed therein.

19. The apparatus of claim 16 wherein:

said imaging film and said collimating film are curved by said frame to lie on a section of a hypothetical circle.

20. The apparatus of claim 16 wherein:

said light scattering means comprises at least one layer of light diffusion film.

21. The apparatus of claim 21 wherein said light scattering means comprises:

a plurality of light diffusion film layers positioned in close adjacent relationship with one another, each of said diffusion film layers having a specified index of refraction; and

an optical transfer adhesive having an index of refraction which is substantially equal to said specified index of refraction positioned between respective adjacent surfaces of said diffusion film layers to substantially eliminate air-filled spaces therebetween, and to bond said diffusion film layers together into a unitary light diffusion structure.