Light source apparatus, image display apparatus, and optical unit

An image display apparatus, comprising:

• (a) a light source apparatus including
• a light source unit including at least one solid-state light source that outputs in an optical axis direction light in a predetermined wavelength range as output light, and
• an output unit including
• a light emitter that is excited by the output light from the light source unit and emits visible light with a wavelength different from a wavelength of the output light,
• a base unit that supports the light emitter and comprises a crystalline member having a crystal axis direction arranged different from a predetermined direction, wherein the predetermined direction is orthogonal to the optical axis direction, and
• a rotate unit that is connected with the base unit and rotates the base unit about a rotation axis, wherein the base unit is configured to suppress disturbance of a polarization direction of the output light when the base unit is rotated by the rotate unit,
• wherein the output light from the light source unit passes through the crystalline member, wherein the output unit outputs combined light containing the light in the predetermined wavelength range and the visible light emitted from the light emitter and wherein the light emitter has a ring shape centered on the rotation axis and extends continuously along a rotation direction of the base unit, around an entire circumference of the base unit;
• (b) an image generation system including
• an image generation element configured to generate an image based on applied light, and
• a lighting optical system configured to apply the combined light output from the light source apparatus to the image generation element;
• and
• (c) a projection system configured to project the image generated by the image generation element.

An optical unit, comprising:

• a light emitter that is excited by output light from at least one solid-state light source that outputs in an optical axis direction light in a predetermined wavelength range as output light and emits visible light with a wavelength different from a wavelength of the output light;
• a base unit that supports the light emitter and comprises a crystalline member having a crystal axis direction arranged different from a predetermined direction, wherein the predetermined direction is orthogonal to the optical axis direction;
• a rotate unit that is connected with the base unit and rotates the base unit about a rotation axis, wherein the base unit is configured to suppress disturbance of a polarization direction of the output light when the base unit is rotated by the rotate unit;
• and
• a lens unit that outputs combined light containing the light in the predetermined wavelength range and the visible light emitted from the light emitter, wherein the output light from the at least one solid-state light source passes through the crystalline member and wherein the light emitter has a ring shape centered on the rotation axis and extends continuously along a rotation direction of the base unit, around an entire circumference of the base unit.