Page light

• US 4,751,615 A
• Filed: 08/07/1986
• Issued: 06/14/1988
• Est. Priority Date: 08/07/1986
• Status: Expired due to Term

• Current Assignee: Acrylic Company Limited
• Original Assignee: International Marketing Concepts, Inc.
• Inventors: Abrams, Martin
• Primary Examiner(s): Cross, E. Rollins
• Assistant Examiner(s): Cox, D. M.
• Application Number:
  US06/893,972
• Time in Patent Office: 677 Days
• Field of Search: 362/98, 362/99, 362/31, 362/32, 362/26, 362/29, 362/30, 350/286, 350/96.1, 206/371, 40/546
• US Class Current: 362/604
• CPC Class Codes: B42D 3/18 Other accessories
• CPC Class Codes: B43L 3/001 with illuminating devices
• CPC Class Codes: F21V 7/00 Reflectors for light sources characterised by cooling arrangements F21V29/505
• CPC Class Codes: F21W 2131/3005 for books, i.e. reading lights attachable to books
• CPC Class Codes: G02B 6/0021 for housing at least a part of the light source, e.g. by forming holes or recesses
• CPC Class Codes: G02B 6/003 Lens or lenticular sheet or layer
• CPC Class Codes: G02B 6/0091 of the light source relative to the light guide G02B6/0021 takes precedence

Abstract

A personal reading and writing light or illumination device having a tapered transparent body with an opening at one end for receiving an illumination source and with a discontinuity adjacent the opening to improve uniformity of illumination of the body and of a reading or writing work surface in contact with the body. The ends and sides of the body are configured or otherwise treated to maximize reflection and minimize illumination of adjacent areas.

Claims

1. A page illumination device comprising:

a three-dimensional body of substantially transparent material, including generally planar first and second major surfaces, opposed side walls and opposed end walls, one of the major surfaces of said body being adapted to be placed in contact with a work surface to effect illumination thereof while minimizing illumination of the surrounding environment;

a source of illumination for said body disposed adjacent to one of said end walls; and

a discontinuity in said body spaced from said one end wall and located in the vicinity of said illumination source for enhancing the uniformity of the illumination of said body and thereby the work surface in contact with said one of the major surfaces of said body and for minimizing undesired dark areas therein.

2. An illumination device as claimed in claim 1, wherein said body is thickest adjacent said one end wall.

3. An illumination device as claimed in claim 2, wherein the thickness of said body tapers generally uniformly from said one end wall to the other of said end walls.

4. An illumination device as claimed in claim 1, including a single opening formed in and extending into said body from said one end wall;

said illumination source being disposed in said opening.

5. An illumination device as claimed in claim 4, wherein said one end wall is shaped as a prism in cross-section for reflecting light emanating from said illumination source back into said body.

6. An illumination device as claimed in claim 4, wherein said opening is located substantially midway between said side walls.

7. An illumination device as claimed in claim 1, wherein said one end wall is configured to maximize reflection of light emanating from said illumination source.

8. An illumination device as claimed in claim 1, wherein the surfaces of said side walls are reflective to reflect light emanating from said illumination source back into said body to minimize illumination of adjacent areas through said side walls.

9. An illumination device as claimed in claim 8, including a reflective coating on said side walls.

10. An illumination device as claimed in claim 1, wherein said illumination source is sufficiently low powered to be thermally safe to the touch.

11. An illumination device as claimed in claim 1, including means covering said one end and adjacent portions of both of said major surfaces of said body and thereby said illumination source and said discontinuity for shielding said source and discontinuity from view.

12. An illumination device as claimed in claim 11, including means attaching said illumination source to said cover means for supporting said source in position adjacent said one end.

13. A page illumination device comprising:

a three-dimensional tapered body of substantially transparent material, including generally planar first and second major surfaces, opposed side walls and opposed end walls, one of the major surfaces of said body being adapted to be placed in contact with a work surface to effect illumination thereof while minimizing illumination of the surrounding environment;

the thickness of said body tapering generally uniformly from one of said end walls to the other of said end walls;

an opening formed in said one end of said body and extending into said body from said one end wall;

a source of illumination for said body disposed in said opening adjacent to said one end wall;

a discontinuity formed in and extending through said body in the vicinity of and adjacent to said illumination source opening for enhancing the uniformity of the illumination of said body and thereby the uniformity of the illumination of the work surface in contact with said one major surface of said body by minimizing undesired dark areas therein at locations spaced away from said discontinuity; and

means extending over a portion of said major surfaces of said body to cover said opening, said discontinuity and said illumination source.

14. An illumination device as claimed in claim 13, including means covering said one end and adjacent portions of both of said major surfaces of said body and thereby said illumination source, said opening and said discontinuity for shielding said source, said opening and discontinuity from view.

15. An illumination device as claimed in claim 14, including means attaching said illumination source to said cover means for supporting said source in said opening.

16. A page illumination device comprising:

a three-dimensional body of substantially transparent material, including generally planar first and second major surfaces, opposed side walls and opposed end walls, one of the major surfaces of said body being adapted to be placed in contact with a work surface to effect illumination thereof while minimizing illumination of the surrounding environment;

a source of illumination for said body disposed adjacent to one of said end walls; and

a discontinuity in said body in the vicinity of said illumination source for enhancing the illumination of said body and thereby the work surface and for minimizing undesired dark areas therein;

said discontinuity being defined by a slot extending through said body from one of said major surfaces to the other and disposed adjacent to said source of illumination.

17. An illumination device as claimed in claim 16, wherein said slot is disposed between said illumination device and the portion of said body adapted to contact the work surface.

18. An illumination device as claimed in claim 16, wherein said slot is generally arcuate.

19. A page illumination device comprising:

a three-dimensional tapered body of substantially transparent material, including generally planar first and second major surfaces, opposed side walls and opposed end walls, one of the major surfaces of said body being adapted to be placed in contact with a work surface to effect illumination thereof while minimizing illumination of the surrounding environment;

the thickness of said body tapering generally uniformly from one of said end walls to the other of said end walls;

an opening formed in said one end of said body and extending into said body from said one end wall;

a source of illumination for said body disposed in said opening adjacent to said one end wall;

a discontinuity formed in and extending through said body in the vicinity of and adjacent to said illumination source opening for enhancing the illumination of said body and thereby the work surface by minimizing undesired dark areas therein, said discontinuity being defined by a slot extending through said body from one of said major surfaces to the other and disposed adjacent to said source of illumination; and

means extending over a portion of said major surfaces of said body to cover said opening, said discontinuity and said illumination source.

20. An illumination device as claimed in claim 19, wherein said slot is disposed between said illumination device and the portion of said body adapted to contact the work surface.

21. An illumination device as claimed in claim 19, wherein said slot is generally arcuate.