1. A lens device, comprising:
a lens having a middle light emitting surface and a periphery light emitting surface, wherein the periphery light emitting surface surrounds the middle light emitting surface; and
a patterned light shielding layer formed on the periphery light emitting surface of the lens.
2. The lens device according to claim 1, wherein the patterned light shielding layer is an ink layer.
3. The lens device according to claim 2, wherein a color of the ink layer is white.
4. The lens device according to claim 3, wherein the reflectivity of the white ink layer is higher than 80%.
5. The lens device according to claim 1, wherein the patterned light shielding layer comprises a plurality of light shielding spots arranged as at least a row of annular pattern.
6. The lens device according to claim 5, wherein a shape of each light shielding spot is a circular, elliptical or polygonal shape.
7. The lens device according to claim 5, wherein the light shielding spots are mutually separated by an interval.
8. The lens device according to claim 5, wherein the light shielding spots comprise a plurality of first light shielding spots and a plurality of second light shielding spots, the first light shielding spots are arranged as a first annular pattern on the lens, the second light shielding spots are arranged as a second annular pattern on the lens, and the second annular pattern surrounds the first annular pattern.
9. The lens device according to claim 8, wherein an area of each second light shielding spot is larger than that of each first light shielding spot.
10. The lens device according to claim 1, wherein the patterned light shielding layer has an annular shape and has a plurality of hollowed spots arranged as at least an annular pattern.
11. The lens device according to claim 10, wherein a shape of each hollowed spot is a circular, elliptical or polygonal shape.
12. The lens device according to claim 10, wherein the hollowed spots are mutually separated by an interval.
13. The lens device according to claim 10, wherein the hollowed spots comprises a plurality of first hollowed spots and a plurality of second hollowed spots, the first hollowed spots are arranged as a third annular pattern on the lens, the second hollowed spots are arranged as a fourth annular pattern on the lens, and the fourth annular pattern surrounds the third annular pattern.
14. The lens device according to claim 13, wherein an area of each second hollowed spot is larger than that of each first hollowed spot.
15. A light source module, comprising:
a light emitting diode (LED); and
a lens device according to claim 1 disposed on an optical path of the LED.
16. The light source module according to claim 15, further comprising at least an optical film disposed on the optical path of the lens device.
17. A light source module, comprising:
a LED; and
a lens device according to claim 2 disposed on an optical path of the LED.
18. A light source module, comprising:
a LED; and
a lens device according to claim 3 disposed on an optical path of the LED.
19. A light source module, comprising:
a LED; and
a lens device according to claim 4 disposed on an optical path of the LED.
20. A light source module, comprising:
a LED; and
a lens device according to claim 5 disposed on an optical path of the LED.
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 process for one-stage preparation of polyoxyalkylene glycols by copolymerizing tetrahydrofuran and alpha, omega-diols in the presence of a heteropolyacid and of a hydrocarbon, which comprises distilling water in a mixture with this hydrocarbon out of the copolymerization.
2. A process as claimed in claim 1, wherein an aliphatic or cycloaliphatic hydrocarbon having from 5 to 12 carbon atoms or an aromatic hydrocarbon having from 6 to 12 carbon atoms or a mixture thereof is used.
3. A process as claimed in claim 1, wherein the hydrocarbon used is pentane.
4. A process as claimed in claim 1, wherein tetrahydrofuran is distilled off at the same time.
5. A process as claimed in claim 1, wherein the mixture of hydrocarbon, water and optionally tetrahydrofuran are distilled at from 40 to 120\xb0 C. and a pressure of from 150 mbar to 2 bar.
6. A process as claimed in claim 1, wherein the hydrocarbon or the hydrocarbontetrahydrofuran mixture is recycled after drying.
7. A process as claimed in claim 1, which can be carried out continuously or batchwise.
8. A process as claimed in claim 1, wherein the alpha, omega-diol used is neopentyl glycol.
9. A process as claimed in claim 2, wherein the hydrocarbon used is pentane.
10. A process as claimed in claim 2, wherein tetrahydrofuran is distilled off at the same time.
11. A process as claimed in claim 3, wherein tetrahydrofuran is distilled off at the same time.
12. A process as claimed in claim 2, wherein the mixture of hydrocarbon, water and optionally tetrahydrofuran are distilled at from 40 to 120\xb0 C. and a pressure of from 150 mbar to 2 bar.
13. A process as claimed in claim 3, wherein the mixture of hydrocarbon, water and optionally tetrahydrofuran are distilled at from 40 to 120\xb0 C. and a pressure of from 150 mbar to 2 bar.
14. A process as claimed in claim 4, wherein the mixture of hydrocarbon, water and optionally tetrahydrofuran are distilled at from 40 to 120\xb0 C. and a pressure of from 150 mbar to 2 bar.
15. A process as claimed in claim 2, wherein the hydrocarbon or the hydrocarbontetrahydrofuran mixture is recycled after drying.
16. A process as claimed in claim 3, wherein the hydrocarbon or the hydrocarbontetrahydrofuran mixture is recycled after drying.
17. A process as claimed in claim 4, wherein the hydrocarbon or the hydrocarbontetrahydrofuran mixture is recycled after drying.
18. A process as claimed in claims 5, wherein the hydrocarbon or the hydrocarbontetrahydrofuran mixture is recycled after drying.
19. A process as claimed in claim 2, which can be carried out continuously or batchwise.
20. A process as claimed in claim 3, which can be carried out continuously or batchwise.