Abstract: The projector includes an exterior chassis provided with a housing section, a light source unit which is housed in the exterior chassis, and is configured to emit light, an image forming unit which is housed in the exterior chassis, and is configured to generate image light from the light, a projection optical unit which is attached to the exterior chassis, and is configured to project the image light, and an imaging unit which is configured to image the image light projected, and is detachably attached, wherein the imaging unit is housed in the housing section.

Abstract: A pointer includes: a pointer tip having a tip configured to point a position; a transmitter configured to emit a signal from the pointer tip; and a main body connected to the pointer tip. The main body includes: an exterior housing forming an exterior; a detector configured to detect displacement of the exterior housing and output a detection signal; and a controller configured to change an operation state of the pointer in accordance with the detection signal. The detector includes: a detection device provided on an inner surface of the exterior housing and configured to detect the displacement; and a signal outputter configured to output the detection signal in the case where the detection device detects the displacement.

Abstract: A pointer includes: a pointer tip having a tip configured to point a position; a transmitter configured to emit a signal from the pointer tip; and a main body connected to the pointer tip. The main body includes: an exterior housing forming an exterior; a detector configured to detect displacement of the exterior housing and output a detection signal; and a controller configured to change an operation state of the pointer in accordance with the detection signal. The detector includes: a detection device provided on an inner surface of the exterior housing and configured to detect the displacement; and a signal outputter configured to output the detection signal in the case where the detection device detects the displacement.

Abstract: A projection system includes a first projector and a second projector. The projection system superimposes images projected from the first and second projectors on a projection surface and displays a projected image. The projection system includes a support configured to support the first projector and the second projector. The support supports the first projector and the second projector in positions where projection distances from the first projector and the second projector to the projection surface are different.

Abstract: A digital pen includes: a light emitting section; a writing section which has a tip part and transmits light emitted from the light emitting section; and a main body section which supports the writing section in a displaceable manner, detects a pressing on the writing section and causes the light emitting section to emit light. The writing section includes a support member supported by the main body section, and an elastic member which has the tip part and is held by the support member.

Abstract: A centrifugal fan introducing air via an inlet port in a direction of a rotation axis and discharging the air via an outlet port in the a direction of a centrifugal force produced by rotation includes: an impeller having a plurality of vanes around the rotation axis; and a housing including the inlet port and supporting the impeller such that the impeller is allowed to freely rotate in the housing. An inclined portion is formed at least at a part of edge portion of the inlet port, the inclined portion widening to the side that the impeller is disposed.

Abstract: A projection system includes a first projector and a second projector. The projection system superimposes images projected from the first and second projectors on a projection surface and displays a projected image. The projection system includes a support configured to support the first projector and the second projector. The support supports the first projector and the second projector in positions where projection distances from the first projector and the second projector to the projection surface are different.

Abstract: A centrifugal fan introducing air via an inlet port in a direction of a rotation axis and discharging the air via an outlet port in the a direction of a centrifugal force produced by rotation includes: an impeller having a plurality of vanes around the rotation axis; and a housing including the inlet port and supporting the impeller such that the impeller is allowed to freely rotate in the housing. An inclined portion is formed at least at a part of edge portion of the inlet port, the inclined portion widening to the side that the impeller is disposed.