Projection apparatus and illumination system having wavelength conversion modules

A projection apparatus, comprising:

• an illumination system, comprising:
• a first light source, emitting a first beam;
• an excitation light source module, emitting an excitation beam;
• a first dichroic filter and a second dichroic filter, disposed on a transmission path of the excitation beam, wherein the first dichroic filter is further disposed on a transmission path of the first beam, and the second dichroic filter is further disposed on a transmission path of the first beam coming from the first dichroic filter;
• a first wavelength conversion module, disposed on a transmission path of a first partial beam of the excitation beam coming from the first dichroic filter, and converting the first partial beam into a first converted beam transmitted back to the first dichroic filter, wherein the second dichroic filter is further disposed on a transmission path of the first converted beam coming from the first dichroic filter, wherein the first wavelength conversion module comprises a first phosphor layer, and the first phosphor layer has a circular segment near 180-degree arc shape;
• a second wavelength conversion module, disposed on a transmission path of a second partial beam of the excitation beam coming from the second dichroic filter, and converting the second partial beam into a second converted beam transmitted back to the second dichroic filter, wherein the second wavelength conversion module comprises a second phosphor layer, and the second phosphor layer has a circular segment near 180-degree arc shape;
• a second light source, emitting a second beam;
• and
• a third dichroic filter, disposed on transmission paths of the second beam and the first beam, the first converted beam, and the second converted beam coming from the second dichroic filter;
• a light valve, converting the first beam, the first converted beam, the second converted beam, and the second beam coming from the third dichroic filter into an image beam;
• and
• an image-forming system, disposed on a transmission path of the image beam,
• wherein the first wavelength conversion module and the second wavelength conversion module are reflective wavelength conversion wheels, the first beam is a first blue beam, the excitation beam is a second blue beam, and a wavelength of the first blue beam is different from a wavelength of the second blue beam, and wherein when the first partial beam of the excitation beam illuminates the first phosphor layer converting to the first converted beam, the second partial beam of the excitation beam does not illuminate the second phosphor layer, and when the second partial beam of the excitation beam illuminates the second phosphor layer converting into the second converted beam, the first partial beam of the excitation beam does not illuminate the first phosphor layer,
• wherein the second dichroic filter has splitting effect and has no dichroic effect for the excitation beam, and the second dichroic filter has the dichroic effect for the first beam, the first converted beam, and the second converted beam.