Light collector for an LED array

• US 6,115,184 A
• Filed: 11/13/1998
• Issued: 09/05/2000
• Est. Priority Date: 11/13/1998
• Status: Expired due to Term

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Scheuer, Mark A., Hubble, Fred F. III, Soures, Nicholas M.
• Primary Examiner(s): Epps, Georgia
• Assistant Examiner(s): THOMPSON, TIMOTHY J
• Application Number:
  US09/192,074
• Time in Patent Office: 662 Days
• Field of Search: 359/712, 359/710, 359/718, 359/627, 359/811, 359/808, 359/726-731
• US Class Current: 359/627
• CPC Class Codes: G02B 19/0028 refractive and reflective surfaces, e.g. non-imaging catadioptric systems
• CPC Class Codes: G02B 19/0066 in the form of an LED array

Abstract

A light collector for directing light to a concentrated area on a target surface such as for use with a linear LED array used as an erase lamp in an electrophotographic printer. The collector includes a compound cylinder lens supported by a pair of reflecting members. The reflecting members reflect light rays from the LED array to the cylinder lens. The cylinder lens includes a lower surface for capturing the reflected light rays and a tongue extending from the lower surface for capturing light rays directly from the LED array. The cylinder lens directs and concentrates the captured light rays in a narrow line on a target surface.

Claims

1. A light collector adapted to be interposed between a light source and a target surface, comprising:

a lens having an upper surface and a lower surface, said lens further having a tongue extending from said lower surface; and

first and second reflecting members, said first and second reflecting members being adapted to support said lens and to reflect light beams from said light source and direct said reflected light beams to said lower surface.

2. The light collector of claim 1 wherein each of said first and second reflecting members comprise a parabolic reflective surface, said parabolic reflective surfaces being positioned relative to each other such that said reflective surfaces combine to form a cylindrical reflector.

3. The light collector of claim 2 wherein said reflective surfaces are positioned relative to said light source to locate said light source at the focus of said cylindrical reflector.

4. The light collector of claim 2 wherein said lens is adapted to capture said reflected light beams at said lower surface and direct said captured light beams to a preselected area on said target surface.

5. The light collector of claim 4 wherein:

said tongue has a distal end adapted to collimate light beams from said light source and direct said collimated light beams through said tongue; and

said lens is further adapted to direct said collimated light beams to said preselected area on said target surface.

6. The light collector of claim 1 wherein:

said tongue has a distal end adapted to capture light beams from said light source; and

said lens is adapted to receive said reflected light beams at said lower surface and to direct said captured light beams and said reflected light beams to a preselected area on said target surface.

7. The light collector of claim 6 wherein each of said first and second reflecting members comprise a parabolic reflective surface, said parabolic reflective surfaces being positioned relative to combine to form a cylindrical reflector having a parabolic cross-section.

8. The light collector of claim 7 wherein said reflective surfaces are positioned relative to said light to locate said light source at the focus of said cylindrical reflector.

9. An apparatus for irradiating a target surface, comprising:

a plurality of light sources arranged in a linear array;

first and second reflecting members being adapted to reflect light beams from said plurality of light sources and direct said reflected light beams toward a single surface; and

a lens having an upper surface, a lower surface and a tongue extending from said lower surface, said lens being supported by said first and second reflecting members and being adapted to receive said reflected light beams at said lower surface and direct said received light beams to a preselected area on said target surface.

10. The apparatus of claim 9 wherein each of said first and second reflecting members comprise a parabolic reflective surface, said parabolic reflective surfaces being positioned to form a cylindrical reflector having a parabolic cross-section.

11. The apparatus of claim 10 wherein said reflective surfaces are positioned relative to said plurality of light sources to locate said plurality of light sources at the focus of said cylindrical reflector.

12. The apparatus of claim 9 wherein:

said tongue has a distal end adapted to capture light beams from said plurality of light sources and direct said captured light beams through said tongue; and

said lens is further adapted to direct said captured light beams to said preselected area on said target surface.

13. The apparatus of claim 9 wherein:

said tongue has a distal end adapted to collimate light beams from said plurality of light sources and direct said collimated light beams through said tongue; and

said lens is adapted to direct said collimated light and said reflected light to said preselected area on said target surface.

14. The apparatus of claim 13 wherein each of said first and second reflecting members comprise a parabolic reflective surface, said parabolic reflective surfaces being positioned such that said reflective surfaces form a cylindrical reflector having a parabolic cross-section with said plurality of light sources located at the focus of said cylindrical reflector.

15. The apparatus of claim 13 wherein light beams emitted from each light source between 90°

and approximately 50°

relative to a reference surface passing through the light source, are collimated by said distal end of said tongue.

16. The apparatus of claim 13 wherein light beams emitted from each light source between 0°

and approximately 50°

relative to a reference surface passing through the light source, are reflected by said first and second reflecting members.

17. A light collector adapted to be interposed between a light source and a target surface, comprising:

a lens having an upper surface and a lower surface, said lens further including a tongue extending from said lower surface, said tongue having a distal end adapted to capture a first portion of light emitted from said light source; and

first and second reflecting members, said first and second reflecting members being adapted to reflect a second portion of light from said light source and direct said reflected light to said lower surface,

wherein said lens directs said captured light beams and said reflected light beams to a preselected area on said target surface.

18. The light collector of claim 17 wherein each of said first and second reflecting members comprise a parabolic reflective surface, said parabolic reflective surfaces being positioned relative to each other and to said light source to locate said light source at a common focus of said parabolic reflective surfaces.

19. An apparatus for irradiating a target surface, comprising:

a plurality of light sources arranged in a linear array;

first and second reflecting members, each of said reflecting members being adapted to reflect light from said plurality of light sources and direct said reflected light toward a single surface; and

a lens having an upper surface, a lower surface and a tongue extending from said lower surface, said tongue having a distal end adapted to capture light from said plurality of light sources and direct said captured light through said tongue, said lower surface being positioned to receive said reflected light, said lens being adapted to direct said received light to a preselected area on said target surface.

20. The apparatus of claim 19 wherein

said distal end is adapted to collimate light beams from said plurality of light sources and direct said collimated light beams through said tongue;

and

said lens is adapted to direct said collimated light to said preselected area on said target surface.

21. The apparatus of claim 19 wherein each of said first and second reflecting members comprise a parabolic reflective surface, said parabolic reflective surfaces being positioned opposite each other such that said plurality of light sources are located at the focus of said parabolic reflective surfaces.