# US 2013/0278902 A1 · Light source module and projection apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0278902 A1 - Document ID: US20130278902A1 - Status: Published application - Kind: A1 - Application number: 13/678,499 - Filed: 2012-11-15 - Published: 2013-10-24 - Earliest claimed: 2012-04-24 - Assignees: Coretronic Corporation - Inventors: Ko-Shun Chen; Tzu-Yi Yang; Chia-Hao Wang - Web page: https://patentgrep.com/patent/US20130278902A1 ## CPC - G03B 21/204: {using secondary light emission, e.g. luminescence or fluorescence (using different colours G03B33/00; if related to video signals H04N9/3197)} - G03B 21/2066: {Reflectors in illumination beam (in projection beam G03B21/28)} - H04N 9/3161: {using laser light sources (using laser beams scanning the display screen H04N9/3129)} - G03B 33/08: Sequential recording or projection (G03B33/02, G03B33/04, G03B33/06 take precedence) - G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A light source module and a projection apparatus are provided. The light source module includes a light-emitting element, an optical path switching element, a wavelength conversion element, a first reflection element, and a first beam splitter element. The optical path switching element switches a first color beam between a first optical path and a second optical path. When the first color beam is switched to the first optical path, the first color beam is propagated to the wavelength conversion element to excite a first and second wavelength conversion layers on the wavelength conversion element to produce a second color beam and a third color beam. When the first color beam is switched to the second optical path, the first color beam is propagated to the first reflection element. ## Claims ### Claim 1 A light source module, comprising: a light-emitting element, adapted to emit a first color beam; an optical path switching element, disposed on a propagating path of the first color beam, and the optical path switching element switching the first color beam between a first optical path and a second optical path; a wavelength conversion element, disposed on the first optical path, and comprising a first wavelength conversion layer and a second wavelength conversion layer, wherein the first wavelength conversion layer and the second wavelength conversion layer are switched to the first optical path in alternation; a first reflection element, disposed on the second optical path, wherein when the first color beam is switched to the first optical path by the optical path switching element, the first color beam respectively excites the first wavelength conversion layer and the second wavelength conversion layer to produce a second color beam and a third color beam, and when the first color beam is switched to the second optical path by the optical path switching element, the first color beam is propagated to the first reflection element; and a first beam splitter element, disposed on a propagating path of the first color beam, the second color beam and the third color beam, the first beam splitter element is adapted to reflect the second color beam and the third color beam, and be passed by the first color beam. ### Claim 2 (depends on 1) The light source module as claimed in claim 1, further comprising a second beam splitter element disposed on the first optical path, wherein the first color beam passes through the second beam splitter element and is propagated to the wavelength conversion element, and the second color beam from the first wavelength conversion layer and the third color beam from the second wavelength conversion layer are reflected to the first beam splitter element by the second beam splitter element. ### Claim 3 (depends on 2) The light source module as claimed in claim 2, further comprising a filter element disposed on the first optical path and located between the wavelength conversion element and the second beam splitter element. ### Claim 4 (depends on 1) The light source module as claimed in claim 1, wherein the wavelength conversion element further comprises a carrier plate, the carrier plate has a reflection surface, and the first wavelength conversion layer and the second wavelength conversion layer are respectively disposed at different regions on the reflection surface. ### Claim 5 (depends on 1) The light source module as claimed in claim 1, wherein the optical path switching element is an optical wheel, the optical wheel has a transmissive area and a reflective area, and the transmissive area and the reflective area are switched to the propagating path of the first color beam in alternation, wherein the first color beam propagated to the reflective area is reflected for switching to the first optical path, and the first color beam propagated to the transmissive area passes through the transmissive area for switching to the second optical path. ### Claim 6 (depends on 1) The light source module as claimed in claim 1, wherein the light-emitting element comprises a plurality of laser diodes, the laser diodes emit a plurality of sub beams, and the sub beams form the first color beam. ### Claim 7 (depends on 6) The light source module as claimed in claim 6, wherein the optical path switching element is a bar-shape lens, the bar-shape lens has a plurality of transmissive areas and a plurality of reflective areas, the reflective areas and the transmissive areas are switched to the propagating path of the first color beam in alternation, wherein the sub beams propagated to the reflective areas are reflected for switching to the first optical path, and the sub beams propagated to the transmissive areas pass through the transmissive areas for switching to the second optical path. ### Claim 8 (depends on 1) The light source module as claimed in claim 1, wherein the optical path switching element is a total internal reflection prism, and the total internal reflection prism is adapted to rotate and has a total reflection surface. ### Claim 9 (depends on 1) The light source module as claimed in claim 1, wherein the optical path switching element comprises a total internal reflection prism and a first reflector, the total internal reflection prism has a total reflection surface, and the first color beam is reflected to the total reflection surface by the first reflector, wherein the first reflector rotates relative to the total reflection surface to change an incident angle of the first color beam incident to the total reflection surface. ### Claim 10 (depends on 1) The light source module as claimed in claim 1, wherein the optical path switching element is a second reflector, and the second reflector is adapted to rotate to sequentially reflect the first color beam to the first optical path and the second optical path. ### Claim 11 (depends on 1) The light source module as claimed in claim 1, wherein the optical path switching element is a dichroic filter. ### Claim 12 (depends on 1) The light source module as claimed in claim 1, further comprising a second reflection element, and the second reflection element reflects the first color beam from the first reflection element to the first beam splitter element. ### Claim 13 (depends on 1) The light source module as claimed in claim 1, further comprising a heat dissipating element connected to the wavelength conversion element. ### Claim 14 A projection apparatus, comprising: a light source module, comprising: a light-emitting element, adapted to emit a first color beam; an optical path switching element, disposed on a propagating path of the first color beam, and the optical path switching element switching the first color beam between a first optical path and a second optical path; a wavelength conversion element, disposed on the first optical path, and comprising a first wavelength conversion layer and a second wavelength conversion layer, wherein the first wavelength conversion layer and the second wavelength conversion layer are switched to the first optical path in alternation; a first reflection element, disposed on the second optical path, wherein when the first color beam is switched to the first optical path by the optical path switching element, the first color beam respectively excites the first wavelength conversion layer and the second wavelength conversion layer to produce a second color beam and a third color beam, and when the first color beam is switched to the second optical path by the optical path switching element, the first color beam is propagated to the first reflection element; and a first beam splitter element, disposed on a propagating path of the first color beam, the second color beam and the third color beam, the first beam splitter element is adapted to reflect the second color beam and the third color beam, and be passed by the first color beam; a light valve, disposed on the propagating path of the first color beam, the second color beam and the third color beam, and convert the color beams into an image beam; and a projection lens, disposed on a propagating path of the image beam. ### Claim 15 (depends on 14) The projection apparatus as claimed in claim 14, further comprising a light uniforming element disposed on the propagating path of the first color beam, the second color beam and the third color beam, and located between the light source module and the light valve. ### Claim 16 (depends on 14) The projection apparatus as claimed in claim 14, further comprising a second beam splitter element disposed on the first optical path, wherein the first color beam passes through the second beam splitter element and is propagated to the wavelength conversion element, and the second color beam from the first wavelength conversion layer and the third color beam from the second wavelength conversion layer are reflected to the first beam splitter element by the second beam splitter element. ### Claim 17 (depends on 16) The projection apparatus as claimed in claim 16, further comprising a filter element disposed on the first optical path and located between the wavelength conversion element and the second beam splitter element. ### Claim 18 (depends on 14) The projection apparatus as claimed in claim 14, wherein the wavelength conversion element further comprises a carrier plate, the carrier plate has a reflection surface, and the first wavelength conversion layer and the second wavelength conversion layer are respectively disposed at different regions on the reflection surface. ### Claim 19 (depends on 14) The projection apparatus as claimed in claim 14, wherein the optical path switching element is an optical wheel, the optical wheel has a transmissive area and a reflective area, and the transmissive area and the reflective area are switched to the propagating path of the first color beam in alternation, wherein the first color beam propagated to the reflective area is reflected for switching to the first optical path, and the first color beam propagated to the transmissive area passes through the transmissive area for switching to the second optical path. ### Claim 20 (depends on 14) The projection apparatus as claimed in claim 14, wherein the light-emitting element comprises a plurality of laser diodes, the laser diodes emit a plurality of sub beams, and the sub beams form the first color beam. ### Claim 21 (depends on 20) The projection apparatus as claimed in claim 20, wherein the optical path switching element is a bar-shape lens, the bar-shape lens has a plurality of transmissive areas and a plurality of reflective areas, the reflective areas and the transmissive areas are switched to the propagating path of the first color beam in alternation, wherein the sub beams propagated to the reflective areas are reflected for switching to the first optical path, and the sub beams propagated to the transmissive areas pass through the transmissive areas for switching to the second optical path. ### Claim 22 (depends on 14) The projection apparatus as claimed in claim 14, wherein the optical path switching element is a total internal reflection prism, and the total internal reflection prism is adapted to rotate and has a total reflection surface. ### Claim 23 (depends on 14) The projection apparatus as claimed in claim 14, wherein the optical path switching element comprises a total internal reflection prism and a first reflector, the total internal reflection prism has a total reflection surface, and the first color beam is reflected to the total reflection surface by the first reflector, wherein the first reflector rotates relative to the total reflection surface to change an incident angle of the first color beam incident to the total reflection surface. ### Claim 24 (depends on 14) The projection apparatus as claimed in claim 14, wherein the optical path switching element is a second reflector, and the second reflector is adapted to rotate to sequentially reflect the first color beam to the first optical path and the second optical path. ### Claim 25 (depends on 14) The projection apparatus as claimed in claim 14, wherein the optical path switching element is a dichroic filter. ### Claim 26 (depends on 14) The projection apparatus as claimed in claim 14, further comprising a second reflection element, and the second reflection element reflects the first color beam from the first reflection element to the first beam splitter element. ### Claim 27 (depends on 14) The projection apparatus as claimed in claim 14, further comprising a heat dissipating element connected to the wavelength conversion element.