Illuminating device and projector using it and built-in display unit

An illumination optical system comprising:

• a light source for emitting a plurality of different colors of light;
• a combined optical scanner;
• a rotation system for rotating the combined optical scanner;
• and
• at least one scanning lens,
• wherein the combined optical scanner has a plurality of reflecting surfaces in a direction of a rotation axis, each reflecting surface being defined by a path traced by a segment that tilts at a predetermined angle with respect to the rotation axis and moves in the direction of the rotation axis while rotating around the rotation axis, and
• the different colors of light enter the respective reflecting surfaces of the combined optical scanner, are reflected therefrom, and pass through the scanning lens, so that a region to be illuminated is scanned sequentially with the different colors of light.

An illumination optical system comprising:

• a light source for emitting white light;
• a combined optical scanner;
• a rotation system for rotating the combined optical scanner;
• and
• at least one scanning lens,
• wherein the combined optical scanner has a plurality of dichroic mirror surfaces in a direction of a rotation axis, each dichroic mirror surface being defined by a path traced by a segment that tilts at a predetermined angle with respect to the rotation axis and moves in the direction of the rotation axis while rotating around the rotation axis, and
• the white light enters successively the dichroic mirror surfaces of the combined optical scanner and is separated into a plurality of different colors of light, and then the different colors of light are reflected from the respective dichroic mirror surfaces and pass through the scanning lens, so that a region to be illuminated is scanned sequentially with the different colors of light.

An illumination optical system comprising:

• a light source for emitting a plurality of different colors of light;
• a combined optical scanner having a hollow portion;
• a plurality of third reflecting surfaces placed in the hollow portion of the combined optical scanner;
• a rotation system for rotating the combined optical scanner;
• and
• at least one scanning lens,
• wherein the combined optical scanner has a plurality of first reflecting surfaces arranged in a direction of a rotation axis, each first reflecting surface being defined by a path traced by a segment that tilts at a predetermined angle with respect to the rotation axis and moves in the direction of the rotation axis while rotating around the rotation axis, and
• a plurality of second reflecting surfaces arranged in the direction of the rotation axis, each second reflecting surface being defined by a path traced by a segment that tilts at a predetermined angle with respect to the rotation axis and rotates around the rotation axis, and
• the different colors of light enter the respective third reflecting surfaces in a direction substantially parallel to the rotation axis, then are reflected in a direction substantially perpendicular to the rotation axis, reflected from the second reflecting surfaces, reflected further from the first reflecting surfaces, and pass through the scanning lens, so that a region to be illuminated is scanned sequentially with the different colors of light.

An illumination optical system comprising:

• a light source for emitting white light;
• a combined optical scanner having a hollow portion;
• a plurality of dichroic mirror surfaces placed in the hollow portion of the combined optical scanner;
• a rotation system for rotating the combined optical scanner;
• and
• at least one scanning lens,
• wherein the combined optical scanner has a plurality of first reflecting surfaces arranged in a direction of a rotation axis, each first reflecting surface being defined by a path traced by a segment that tilts at a predetermined angle with respect to the rotation axis and moves in the direction of the rotation axis while rotating around the rotation axis, and
• a plurality of second reflecting surfaces arranged in the direction of the rotation axis, each second reflecting surface being defined by a path traced by a segment that tilts at a predetermined angle with respect to the rotation axis and rotates around the rotation axis, and
• the white light enters successively the dichroic mirror surfaces in a direction substantially parallel to the rotation axis of the combined optical scanner and is separated into a plurality of different colors of light, and then the different colors of light are reflected from the respective dichroic mirror surfaces in a direction substantially perpendicular to the rotation axis, reflected from the second reflecting surfaces, reflected further from the first reflecting surfaces, and pass through the scanning lens, so that a region to be illuminated is scanned sequentially with the different colors of light.

An illumination optical system comprising:

• a light source for emitting a plurality of different colors of light;
• a combined optical scanner having a hollow portion;
• a plurality of second reflecting surfaces placed in the hollow portion of the combined optical scanner;
• a rotation system for rotating the combined optical scanner;
• a plurality of third reflecting surfaces;
• and
• at least one scanning lens,
• wherein the combined optical scanner has a plurality of first reflecting surfaces in a direction of a rotation axis, each first reflecting surface being defined by a path traced by a segment that tilts at a predetermined angle with respect to the rotation axis and moves in the direction of the rotation axis while rotating around the rotation axis, and
• the different colors of light enter the respective second reflecting surfaces in a direction substantially parallel to the rotation axis of the combined optical scanner, then are reflected in a direction substantially perpendicular to the rotation axis, reflected from the third reflecting surfaces, reflected further from the first reflecting surfaces, and pass through the scanning lens, so that a region to be illuminated is scanned sequentially with the different colors of light.

An illumination optical system comprising:

• a light source for emitting white light;
• a combined optical scanner having a hollow portion;
• a plurality of dichroic mirror surfaces placed in the hollow portion of the combined optical scanner;
• a rotation system for rotating the combined optical scanner;
• a plurality of second reflecting surfaces;
• and
• at least one scanning lens,
• wherein the combined optical scanner has a plurality of first reflecting surfaces in a direction of a rotation axis, each first reflecting surface being defined by a path traced by a segment that tilts at a predetermined angle with respect to the rotation axis and moves in the direction of the rotation axis while rotating around the rotation axis, and
• the white light enters successively the dichroic mirror surfaces in a direction substantially parallel to the rotation axis of the combined optical scanner and is separated into a plurality of different colors of light, and then the different colors of light are reflected from the respective dichroic mirror surfaces in a direction substantially perpendicular to the rotation axis, reflected from the second reflecting surfaces, reflected further from the first reflecting surfaces, and pass through the scanning lens, so that a region to be illuminated is scanned sequentially with the different colors of light.