Curing light

• US 6,755,649 B2
• Filed: 02/05/2002
• Issued: 06/29/2004
• Est. Priority Date: 09/24/1999
• Status: Expired due to Term

• Current Assignee: CAO Group, Inc.
• Original Assignee: CAO Group, Inc.
• Inventors: Cao, Densen
• Primary Examiner(s): Lewis, Ralph A.
• Application Number:
  US10/072,853
• Publication Number:
  US 20020168606A1
• Time in Patent Office: 875 Days
• Field of Search: 433/29, 433/215, 606/1, 606/13, 606/16, 607/88, 362/119, 362/800, 362/804
• US Class Current: 433/29
• CPC Class Codes: A61C 19/004 Hand-held apparatus, e.g. guns
• CPC Class Codes: A61N 2005/0652 Arrays of diodes
• CPC Class Codes: B23K 26/0096 Portable laser equipment, e.g. hand-held laser apparatus surgical laser instruments A61B18/20, Dental Lasers A61C1/0046, Hand-held laser dental apparatus for curing resins A61C19/004
• CPC Class Codes: B23K 26/0608 in the same heat affected zone [HAZ] B23K26/0613, B23K26/0619 take precedence
• CPC Class Codes: B23K 26/064 by means of optical elements, e.g. lenses, mirrors or prisms
• CPC Class Codes: B23K 26/0643 comprising mirrors
• CPC Class Codes: B23K 26/0648 comprising lenses
• CPC Class Codes: B23K 26/0665 by beam condensation on the workpiece, e.g. for focusing
• CPC Class Codes: B23K 26/703 Cooling arrangements by using a fluid stream B23K26/14
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A curing light system useful for curing light activated composite materials is disclosed. Various configurations of light emitting semiconductor chips and heat sinks are disclosed, as well as various structures and methods for driving, controlling and using them.

Claims

1. A curing light comprising:

a wand adapted to be grasped by a human hand for use in positioning and manipulating the curing light,

a light module on said wand,

said light module including a secondary heat sink, said secondary heat sink being configured to assist in heat dissipation,

said secondary heat sink having a first and a second mounting platform,

said first and said second mounting platforms being arranged with respect to each other at an angle θ

, said angle θ

being less than 180 degrees,

first light emitting semiconductor chip module mounted on said first mounting platform,

a second light emitting semiconductor chip module located on said second mounting platform, and

each of said first and said second chip modules including a primary heat sink, a light emitting semiconductor chip affixed to said primary heat sink, and a cover;

wherein mounting of said primary and secondary chip modules on said first and second mounting platforms at an angle θ

with respect to each other causes light from said first and said second chip modules to overlap in an overlapping light beam that creates an overlapping light footprint that has increased light density compared to only one of said chip modules emitting light.

2. A curing light as recited in claim 1 wherein at least one of said semiconductor chips is selected from the group consisting of light emitting diode chips, laser chips, light emitting diode chip array, diode laser chips, diode laser chip array, surface emitting laser chips, edge emitting laser chips, and VCSEL chips.

3. A curing light as recited in claim 1 wherein said chip modules are mounted to said secondary heat sink by use of a heat conductive adhesive.

4. A curing light as recited in claim 1 wherein said chips are mounted to said primary heat sinks by use of an adhesive selected from the group consisting of light reflective adhesive and heat conductive adhesive.

5. A curing light as recited in claim 1 further comprising a well in said first chip module primary heat sink and said second chip module primary heat sink, said wells having light reflective walls.

6. A curing light as recited in claim 5 wherein at least one wall of at least one well includes a material selected from the group consisting of Al, Au, Ag, Zn, Cu, Pt, chrome, metal, plating and plastic.

7. A curing light as recited in claim 1 further comprising a switch on said wand for initiating emission of light from said semiconductor chips.

8. A curing light as recited in claim 1 wherein said at least one of said covers is selected from the group consisting of windows, domes and focus lenses.

9. A curing light as recited in claim 1 wherein at least one of said chips includes an epitaxial layer selected from the group consisting of active layers, reflective layers, cladding layers and contact layers.

10. A curing light comprising:

a wand adapted to be grasped by a human hand for use in positioning and manipulating the curing light,

control buttons located on said wand for use in initiating and terminating light emission by the curing light,

an elongate secondary heat sink at least partially located in said wand, said secondary heat sink being configured to assist in heat dissipation,

said secondary heat sink having a longitudinal axis, a proximal end and a distal end,

said secondary heat sink having a first and a second mounting platform, said mounting platforms located at said secondary heat sink distal end,

said first and said second mounting platforms being arranged with respect to each other at an angle θ

, said angle θ

being less than 180 degrees,

a first primary heat sink mounted on said first mounting platform,

a first light emitting semiconductor chip mounted to said first primary heat sink,

a second primary heat sink mounted on said second mounting platform,

a second light emitting semiconductor chip mounted to said second primary heat sink,

wherein mounting of said primary and secondary chips on said first and second primary heat sinks on said first and second mounting platforms at an angle θ

with respect to each other causes light emitted from said first and said second chips to overlap in an overlapping light beam that creates an overlapping light footprint.

11. A curing light as recited in claim 10 wherein at least one of said semiconductor chips is selected from the group consisting of light emitting diode chips, laser chips, light emitting diode chip array, diode laser chips, diode laser chip array, surface emitting laser chips, edge emitting laser chips, and VCSEL chips.

12. A curing light as recited in claim 10 wherein at least one of said chips includes an epitaxial layer selected from the group consisting of active layers, reflective layers, cladding layers and contact layers.

13. A curing light as recited in claim 10 wherein said chips are mounted to said primary heat sinks by use of an adhesive selected from the group consisting of heat conductive adhesive and light reflective adhesive.

14. A curing light as recited in claim 10 wherein at least one of said heat sinks includes a material selected from the group consisting of copper, aluminum, silicon carbide, boron nitride natural diamond, monocrystalline diamond, polycrystalline diamond, polycrystalline diamond compacts, diamond deposited through chemical vapor deposition and diamond deposited through physical vapor deposition.

15. A curing light as recited in claim 10 further comprising a well in at least one of said first and second primary heat sinks, at least one of said first and second chip being mounted in said well.

16. A curing light as recited in claim 15 wherein at least one wall of said well includes a material selected from the group consisting of Al, Au, Ag, Zn, Cu, Pt, chrome, metal, plating and plastic.

17. A curing light as recited in claim 10 further comprising a cover to cover at least one of said chips.

18. A curing light as recited in claim 17 wherein said cover is selected from the group consisting of windows, domes and focus lenses.

19. A curing light as recited in claim 10 wherein said overlapping light beam is generally orthogonal to said elongate heat sink longitudinal axis.

20. A curing light as recited in claim 10 further comprising a battery for powering said chips.