Illumination arrangement for a colour measurement device
View Patent ↗An illumination arrangement for a color measurement device includes a linear arrangement of light emitting diode chips ( 11 ) packed tightly along a narrowly defined path. A plurality of light emitting diode chips within at least one region of the path emit light of substantially the same color and are directly covered together with a resin in which a converter material is included for the conversion of the light emitted by the light emitting diode chips of the plurality thereof into at least one other wavelength range. An illumination light with cosine characteristic is emitted from a surface of the resin. UV light emitting regions and non-UV light emitting regions as well as regions including color filters and/or polarization filters may be provided. The illumination arrangement may include white emitting regions and narrow band emitting regions constructed especially for color density measurement.
1. An illumination arrangement for a color measurement device, the illumination arrangement comprising:
a linear arrangement of light emitting diode chips packed tightly along a narrowly defined path;
wherein within at least one region of the narrowly defined path, the linear arrangement comprises a plurality of light emitting diode chips emitting light of substantially the same color and directly covered together with a resin in which a converter material is included for the conversion of the light emitted from the light emitting diode chips of the plurality thereof into at least one other wavelength range; and
wherein an illumination light with cosine characteristic is emitted from a surface of the resin.
2. The illumination arrangement according to claim 1 , wherein the linear arrangement of light emitting diode chips includes light emitting diode chips with respectively different spectral characteristics.
3. The illumination arrangement according to claim 1 , wherein within at least one region of the narrowly defined path, the linear arrangement emits UV light, and within at least another region of the narrowly defined path, the linear arrangement emits non-UV light, whereby the UV light emitted in the at least one region is suited for the excitation of brighteners in paper.
4. The illumination arrangement according to claim 1 , wherein within at least one region of the narrowly defined path, the linear arrangement includes color filters.
5. The illumination arrangement according to claim 1 , wherein within at least one region of the narrowly defined path, the linear arrangement includes polarization filters.
6. The illumination arrangement according to claim 1 , wherein within at least one region of the narrowly defined path, the linear arrangement emits white light, and within at least another region of the narrowly defined path, the linear arrangement emits narrow band light.
7. The illumination arrangement according to claim 6 , wherein the at least another region of the narrowly defined path that emits narrow band light is constructed for color density measurements.
8. The illumination arrangement according to claim 1 , wherein within at least one region of the narrowly defined path, the linear arrangement includes narrow band converter materials.
9. The illumination arrangement according to claim 1 , wherein the converter material includes ortho-silicate illuminants (BOSE).
10. The illumination arrangement according to claim 1 , wherein the light emitting diode chips of the linear arrangement are selectively controllable.
11. The illumination arrangement according to claim 10 , wherein the light emitting diode chips of the linear arrangement are selectively controllable individually or in groups.
12. The illumination arrangement according to claim 1 , wherein the color measurement device is a point-by-point or line-by-line measuring spectrophotometer.
13. The illumination arrangement according to claim 1 , wherein the narrowly defined path is at least one of straight, partially straight, curved or circular.
14. The illumination arrangement according to claim 1 , wherein the linear arrangement of light emitting diode chips is ring-shaped, and wherein a main direction of emission associated with the illumination light is substantially perpendicular to a plane defined by the ring-shaped linear arrangement.
15. The illumination arrangement according to claim 1 , wherein the illumination arrangement includes a base plate and a circuit board positioned on the base plate, wherein a groove is defined in the circuit board that exposes a surface of the base plate, the light emitting diode chips of the linear arrangement are positioned in the groove and mounted with respect to the base plate, and at least a portion of the resin is cast into the groove in the circuit board.
16. The illumination arrangement according to claim 15 , wherein the light emitting diode chips of the linear arrangement are directly adhered onto the base plate.
17. The illumination arrangement according to claim 16 , wherein the light emitting diode chips of the linear arrangement are adhered onto the base plate via a die bonding technique.
18. The illumination arrangement according to claim 15 , wherein the electrical contacts of the light emitting diode chips of the linear arrangement are connected to corresponding contact surfaces of the circuit board via fine wires.
19. The illumination arrangement according to claim 18 , wherein the electrical contacts of the light emitting diode chips of the linear arrangement are connected to the corresponding contact surfaces of the circuit board via a wire bonding technique.
20. The illumination arrangement according to claim 14 , wherein the illumination arrangement includes a base plate and inner and outer annular walls mounted with respect to the base plate, wherein a space is defined between the inner and outer annular walls that exposes a surface of the base plate, the light emitting diode chips of the linear arrangement are positioned in the space and mounted with respect to the base plate, and at least a portion of the resin is cast into the space between the inner and outer annular walls.