Projection system, light engine module, wavelength conversion assembly thereof and manufacturing method of wavelength conversion assembly

A light engine module configured to provide an illuminating light beam, comprising:

• a light source assembly configured to provide at least two light beams;
• and
• a wavelength conversion assembly disposed in an optical path of the at least two light beams, the wavelength conversion assembly having an entrance side and an exit side, and comprising:
• at least two light guiding members and a cladding layer;
• wherein each of the at least two light guiding members is an optical channel made of a light-guiding material, extending from the entrance side to the exit side and has an outer peripheral surface, an entrance end corresponding to the entrance side and an exit end corresponding to the exit side;
• wherein the cladding layer covers at least a portion of the outer peripheral surface of the at least two light guiding members;
• wherein the at least two light guiding members comprise a first color light guiding member and a second color light guiding member, and the at least two light beams comprise a first light beam and a second light beam;
• wherein the first light beam is configured to enter the first color light guiding member through the entrance end thereof and propagates therein, and a first color light exits the first color light guiding member through the exit end thereof, wherein a wavelength range of the first light beam is identical to a wavelength range of the first color light;
• wherein the second light beam is configured to enter the second color light guiding member through the entrance end thereof and propagates therein, and a second color light exits the second color light guiding member through the exit end thereof, wherein a wavelength range of the second color light is different from the wavelength range of the first color light, and a wavelength range of the second light beam is different from or identical to the wavelength range of the first light beam;
• and
• wherein, with respect to the first color light and the second color light, the cladding layer has a refractive index smaller than that of each of the at least two light guiding members,
• wherein the illuminating light beam comprises at least one of the first color light and the second color light.

A projection system, comprising:

• a light engine module configured to provide an illuminating light beam, comprising:
• a light source assembly configured to provide at least two light beams;
• and
• a wavelength conversion assembly disposed in an optical path of the at least two light beams, the wavelength conversion assembly having an entrance side and an exit side, and comprising:
• at least two light guiding members and a cladding layer;
• wherein each of the at least two light guiding members is an optical channel made of a light-guiding material, extending from the entrance side to the exit side and has an outer peripheral surface, an entrance end corresponding to the entrance side and an exit end corresponding to the exit side;
• wherein the cladding layer covers at least a portion of the outer peripheral surface of the at least two light guiding members;
• wherein the at least two light guiding members comprise a first color light guiding member and a second color light guiding member, and the at least two light beams comprise a first light beam and a second light beam;
• wherein the first light beam is configured to enter the first color light guiding member through the entrance end thereof and propagates therein, and a first color light exits the first color light guiding member through the exit end thereof, wherein a wavelength range of the first light beam is identical to a wavelength range of the first color light;
• wherein the second light beam is configured to enter the second color light guiding member through the entrance end thereof and propagates therein, and a second color light exits the second color light guiding member through the exit end thereof, wherein a wavelength range of the second color light is different from the wavelength range of the first color light, and a wavelength range of the second light beam is different from or identical to the wavelength range of the first light beam;
• and
• wherein, with respect to the first color light and the second color light, the cladding layer has a refractive index smaller than that of each of the at least two light guiding members,
• wherein the illuminating light beam comprises at least one of the first color light and the second color light;
• an image modulation device disposed in an optical path of the illuminating light beam to convert the illuminating light beam into an image light beam;
• a projecting lens disposed in an optical path of the image light beam, wherein the image light beam is projected through the projecting lens to form an image.

A manufacturing method of a wavelength conversion assembly, comprising:

• providing a light guiding material;
• providing a wavelength conversion material;
• mixing the wavelength conversion material with the light guiding material and molding the mixture in a mold to form a wavelength conversion rod;
• providing a cladding material, wherein the cladding material has an optical refractive index smaller than that of the wavelength conversion rod;
• molding the wavelength conversion rod and the cladding material in a mold such that the cladding material covers an outer peripheral surface of the wavelength conversion rod to form a cladding layer, thereby obtaining a wavelength conversion assembly preform;
• heating the wavelength conversion assembly preform to a drawing temperature;
• drawing the heated wavelength conversion assembly preform to form a wavelength conversion wire material;
• cutting the wavelength conversion wire material to a proper length to form the wavelength conversion assembly.