Illumination system and projection apparatus

An illumination system, configured to provide an illumination light beam, comprising:

• a first excitation light source, a second excitation light source, and a first diffusion element, wherein
• the first excitation light source is configured to emit a first excitation light beam, the second excitation light source is configured to emit a second excitation light beam, and the first excitation light beam and the second excitation light beam have different colors;
• the first diffusion element is disposed on transmission paths of the first excitation light beam and the second excitation light beam, the first diffusion element comprises a first diffusion region and a second diffusion region having different diffusion degrees, wherein at least one of the first excitation light beam and the second excitation light beam sequentially passes through the first diffusion region and the second diffusion region, and the illumination light beam comprises the first excitation light beam and the second excitation light beam;
• and
• the at least one of the first excitation light beam and the second excitation light beam is incident to the first diffusion region from a first surface of the first diffusion element, and is incident to the second diffusion region from a second surface of the first diffusion element, and the first surface is opposite to the second surface.

An illumination system, configured to provide an illumination light beam, comprising:

• a first excitation light source, a second excitation light source, and a first diffusion element, wherein
• the first excitation light source is configured to emit a first excitation light beam, the second excitation light source is configured to emit a second excitation light beam, and the first excitation light beam and the second excitation light beam have different colors;
• the first diffusion element is disposed on transmission paths of the first excitation light beam and the second excitation light beam, the first diffusion element comprises a first diffusion region and a second diffusion region having different diffusion degrees, wherein at least one of the first excitation light beam and the second excitation light beam sequentially passes through the first diffusion region and the second diffusion region, and the illumination light beam comprises the first excitation light beam and the second excitation light beam;
• and
• the at least one of the first excitation light beam and the second excitation light beam passes through the first diffusion region from a first end of the first diffusion element, and passes through the second diffusion region from a second end of the first diffusion element, and the first end and the second end are respectively located on two opposite sides of a central axis of the first diffusion element.

An illumination system, configured to provide an illumination light beam, comprising:

• a first excitation light source, a second excitation light source, and a first diffusion element, wherein
• the first excitation light source is configured to emit a first excitation light beam, the second excitation light source is configured to emit a second excitation light beam, and the first excitation light beam and the second excitation light beam have different colors;
• the first diffusion element is disposed on transmission paths of the first excitation light beam and the second excitation light beam, the first diffusion element comprises a first diffusion region and a second diffusion region having different diffusion degrees, wherein at least one of the first excitation light beam and the second excitation light beam sequentially passes through the first diffusion region and the second diffusion region, and the illumination light beam comprises the first excitation light beam and the second excitation light beam;
• and
• the illumination system further comprises a second diffusion element, wherein the second diffusion element is disposed on the transmission paths of the first excitation light beam and the second excitation light beam from the first diffusion element.

An illumination system, configured to provide an illumination light beam, comprising:

• a first excitation light source, a second excitation light source, and a first diffusion element, wherein
• the first excitation light source is configured to emit a first excitation light beam, the second excitation light source is configured to emit a second excitation light beam, and the first excitation light beam and the second excitation light beam have different colors;
• the first diffusion element is disposed on transmission paths of the first excitation light beam and the second excitation light beam, the first diffusion element comprises a first diffusion region and a second diffusion region having different diffusion degrees, wherein at least one of the first excitation light beam and the second excitation light beam sequentially passes through the first diffusion region and the second diffusion region, and the illumination light beam comprises the first excitation light beam and the second excitation light beam;
• and
• the first excitation light beam is incident to the first diffusion region from a first surface of the first diffusion element, the second excitation light beam is incident to the first diffusion region or the second diffusion region from a second surface of the first diffusion element, and the first surface is opposite to the second surface.

An illumination system, configured to provide an illumination light beam, comprising:

• a first excitation light source, a second excitation light source, and a first diffusion element, wherein
• the first excitation light source is configured to emit a first excitation light beam, the second excitation light source is configured to emit a second excitation light beam, and the first excitation light beam and the second excitation light beam have different colors;
• the first diffusion elements disposed on transmission paths of the first excitation light beam and the second excitation light beam, the first diffusion element comprises a first diffusion region and a second diffusion region having different diffusion degrees, wherein at least one of the first excitation light beam and the second excitation light beam sequentially passes through the first diffusion region and the second diffusion region, and the illumination light beam comprises the first excitation light beam and the second excitation light beam;
• and
• the first excitation light beam and the second excitation light beam are obliquely incident with respect to the first diffusion element.

An illumination system, configured to provide an illumination light beam, comprising:

• a first excitation light source, a second excitation light source, and a first diffusion element, wherein
• the first excitation light source is configured to emit a first excitation light beam, the second excitation light source is configured to emit a second excitation light beam, and the first excitation light beam and the second excitation light beam have different colors,
• the first diffusion element is disposed on transmission paths of the first excitation light beam and the second excitation light beam, the first diffusion element comprises a first diffusion region and a second diffusion region having different diffusion degrees, wherein at least one of the first excitation light beam and the second excitation light beam sequentially passes through the first diffusion region and the second diffusion region, and the illumination light beam comprises the first excitation light beam and the second excitation light beam;
• and
• the illumination system further comprises two focusing lenses, wherein one of the two focusing lenses is located on the transmission path of the first excitation light beam and is disposed between the first excitation light source and the first diffusion element, and the other one of the two focusing lenses is located on the transmission path of the second excitation light beam and is disposed between the second excitation light source and the first diffusion element, and the first diffusion region or the second diffusion region of the first diffusion element is disposed at a focal position of the two focusing lenses.