1. A packaged semiconductor light emitting device, comprising:
a substrate;
a semiconductor light emitting device on a front face of the substrate;
a first optical element on the front face of the substrate proximate the semiconductor light emitting device but not covering the semiconductor light emitting device, wherein the first optical element comprises a ring around the semiconductor light emitting device having a curved top and wherein the ring comprises a toroidal shape; and
a second optical element on the front face of the substrate over the semiconductor light emitting device and the first optical element, wherein the first and second optical elements comprise different materials to provide the first optical element and the second optical element different refractive indexes selected to provide a desired optical characteristic for the packaged semiconductor light emitting device.
2. The device of claim 1, wherein the semiconductor light emitting device is flush on the front face of the substrate without a reflector cavity and wherein the second optical element extends from the front face of the substrate in a region surrounding the semiconductor light emitting device and extends over the semiconductor light emitting device.
3. The device of claim 1, further comprising a wire bond that electrically couples the semiconductor light emitting device to a contact portion the substrate and wherein the second optical element is a compression molded optical element that directly contacts the wire bond.
4. The device of claim 3, wherein the second optical element comprises a first material having an adhesion characteristic selected to facilitate adhesion of the first optical element to the substrate during compression molding and to limit stress applied to the light emitting device andor a wire bond coupled thereto during thermal cycling of the packaged semiconductor light emitting device.
5. The device of claim 1, wherein the desired optical characteristic comprises a selected viewing angle of the packaged semiconductor light emitting device.
6. The device of claim 1, wherein the first optical element extends entirely around the light emitting device.
7. The device of claim 1, wherein the first optical element comprises an additive.
8. The device of claim 1, wherein the second optical element comprises an additive.
9. The device of claim 1, wherein the first optical element comprises a first additive and the second optical element comprises a second additive different form the first additive.
10. The device of claim 1, wherein the first optical element comprises an additive such that the first optical element provides greater efficiency in light extraction from the semiconductor light emitting device than a reflective cavity.
11. The device of claim 1, wherein the ring is symmetrical along a vertical axis orthogonal to a radius of the ring at any point on the ring.
12. A packaged semiconductor light emitting device, comprising:
a substrate;
a semiconductor light emitting device on a front face of the substrate;
a first optical element on the front face of the substrate proximate the semiconductor light emitting device but not covering the semiconductor light emitting device, wherein the first optical element comprises a ring around the semiconductor light emitting device having a curved top; and
a second optical element on the front face of the substrate over the semiconductor light emitting device and the first optical element, wherein the second optical element directly contacts the semiconductor light emitting device, wherein the second optical element directly contacts an entire external surface of the first optical element that is not contacting the front face of the substrate and wherein the optical elements comprise a material different from a material of the substrate, and wherein at least one of the first and second optical elements comprises an additive to affect optical properties.
13. The device of claim 12, wherein the first optical element extends entirely around the light emitting device.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A handheld extruder welding device for welding thermoplastic synthetic materials by means of an extrusion screw in a screw cylinder surrounding the extrusion screw that is driven by a drive system enclosed in a housing, and has at least one feed channel for a plastic welding wire that extends, at least partially, over the length of the feed zone of the extrusion screw and has the shape of a chute, wherein the feed channel has at least one ridge running in longitudinal direction.
2. The handheld extruder welding device according to claim 1, wherein the ridge is located in a section of the feed channel that is opposite the feed zone of the handheld extruder welding device.
3. The handheld extruder welding device according to claim 2, wherein the top of the ridge is sharp.
4. The handheld extruder welding device according to claim 1, wherein the top of the ridge is sharp.
5. The handheld extruder welding device according to claim 4, wherein the bottom of the feed channel runs at an angle to the extrusion screw, and, starting where the welding wire enters the feed channel, the depth of the feed channel decreases continuously and tapers off at the end.
6. The handheld extruder welding device according to claim 1, wherein the bottom of the feed channel runs at an angle to the extrusion screw, and, starting where the welding wire enters the feed channel, the depth of the feed channel decreases continuously and tapers off at the end.
7. The handheld extruder welding device according to claim 2, wherein the bottom of the feed channel runs at an angle to the extrusion screw, and, starting where the welding wire enters the feed channel, the depth of the feed channel decreases continuously and tapers off at the end.
8. The handheld extruder welding device according to claim 3, wherein the bottom of the feed channel runs at an angle to the extrusion screw, and, starting where the welding wire enters the feed channel, the depth of the feed channel decreases continuously and tapers off at the end.
9. The handheld extruder welding device according to claim 8, wherein the feed channel is located in a one- or two-piece feed sleeve that surrounds the feed zone of the extrusion screw.
10. The handheld extruder welding device according to claim 1, wherein the feed channel is located in a one- or two-piece feed sleeve that surrounds the feed zone of the extrusion screw.
11. The handheld extruder welding device according to claim 2, wherein the feed channel is located in a one- or two-piece feed sleeve that surrounds the feed zone of the extrusion screw.
12. The handheld extruder welding device according to claim 3, wherein the feed channel is located in a one- or two-piece feed sleeve that surrounds the feed zone of the extrusion screw.
13. The handheld extruder welding device according to claim 4, wherein the feed channel is located in a one- or two-piece feed sleeve that surrounds the feed zone of the extrusion screw.
14. The handheld extruder welding device according to claim 5, wherein the feed channel is located in a one- or two-piece feed sleeve that surrounds the feed zone of the extrusion screw.
15. The handheld extruder welding device according to claim 6, wherein the feed channel is located in a one- or two-piece feed sleeve that surrounds the feed zone of the extrusion screw.
16. The handheld extruder welding device according to claim 7, wherein the feed channel is located in a one- or two-piece feed sleeve that surrounds the feed zone of the extrusion screw.
17. The handheld extruder welding device according to claim 9, wherein, on the housing side, the feed sleeve is held in a holding element with a central passage.
18. The handheld extruder welding device according to claim 10, wherein, on the housing side, the feed sleeve is held in a holding element with a central passage.
19. The handheld extruder welding device according to claim 11, wherein, on the housing side, the feed sleeve is held in a holding element with a central passage.
20. The handheld extruder welding device according to claim 12, wherein, on the housing side, the feed sleeve is held in a holding element with a central passage.