Abstract: An image projection apparatus includes a light source, an image generation unit configured to receive light from the light source and generate an image based on the received light, a projection optical system unit configured to project the image generated by the image generation unit, a heat dissipation unit configured to dissipate heat of the image generation unit, and a movable member configured such that a position of the movable member is movable relative to the projection optical system unit, wherein the image generation unit and the heat dissipation unit are mounted on the movable member.

Abstract: An image projection apparatus includes a light source, light from which is used to form an image to be projected, a first flow path, a control unit configured to control a light emission from the light source, an electrical power stabilizing unit configured to stabilize an electrical power to be supplied to the light source, and an electrical power source unit configured to supply the electrical power to at least one of the control unit and the electrical power stabilizing unit. One or both of the electrical power source unit and the electrical power stabilizing unit is/are divided into a plurality of boards. The light source is arranged on a normal line of a surface of any of the plurality of boards. The plurality of boards configure surfaces of the first flow path except a surface nearest to the light source.

Abstract: A cooling apparatus including an air blow part including an air outtake port; and a heat dissipater including a plurality of heat dissipating fins, wherein an end side of an upper surface of the heat dissipater is linearly aligned, wherein the plurality of heat dissipating fins includes a first heat dissipating area and a second heat dissipating area, wherein a surface area of the heat dissipating fins arranged in the first heat dissipating area is smaller than a surface area of the heat dissipating fins arranged in the second heat dissipating area, wherein the heat dissipating fins are arranged at a position facing the air outtake port of the air blow part.

Abstract: Disclosed is a light source device including a light source that includes a light emitting tube; and a cooler configured to cool the light emitting tube. The cooler includes an inlet port for drawing cooling air for cooling the light emitting tube; a flow channel that extends from the inlet port to the light emitting tube in a horizontal direction and that is for flowing the cooling air toward the light emitting tube; and a baffle plate that is disposed in the flow channel and that can slide in a gravity direction. The baffle plate has a shape and openings such that, in an installation state, an upper portion of the flow channel is opened and a lower portion of the flow channel is closed by the shape and positions of the openings of the baffle plate.

Abstract: An image projection apparatus includes a light source, light from which is used to form an image to be projected, a first flow path, a control unit configured to control a light emission from the light source, an electrical power stabilizing unit configured to stabilize an electrical power to be supplied to the light source, and an electrical power source unit configured to supply the electrical power to at least one of the control unit and the electrical power stabilizing unit. One or both of the electrical power source unit and the electrical power stabilizing unit is/are divided into a plurality of boards. The light source is arranged on a normal line of a surface of any of the plurality of boards. The plurality of boards configure surfaces of the first flow path except a surface nearest to the light source.

Abstract: A cooling device includes a heat dissipating unit that is in contact with an object to be cooled and dissipates heat, and an air blowing unit that takes therein air and blows the air to the heat dissipating unit. The heat dissipating unit includes a first stage portion and a second stage portion that have a difference in level therebetween. The air blowing unit includes a first inlet port that takes therein air from outside, and an outlet port that exhausts the taken-in air. The first inlet port faces the first stage portion, and the outlet port faces the second stage portion.

Abstract: A projection optical device to project an image on a projection plane, includes a reflection mirror, a plurality of projection lenses, a projection lens supporting member to support the plurality of projection lenses, and a position-arrangement member provided at the projection lens supporting member to arrange the reflection mirror at a predefined position on the projection lens supporting member.

Abstract: An image projection apparatus including a light source, a projection unit to project light from the light source, a dust-proof member to protect the projection unit from outside dust and through which light from the light source passes, a light detector provided at an end surface of the dust-proof member to detect reflected light of light projected from the projection unit, the reflected light being internally reflected light trapped within the dust-proof member, and a controller that executes a protective action when the amount of internally reflected light detected by the light detector meets or exceeds a predetermined threshold value.

Abstract: An image projection apparatus includes: a grid portion provided on a housing of the apparatus and having a plurality of grids through which air flows in or out of the apparatus. The grid portion includes an edge portion of the grid portion, and a central portion of the grid portion, having a thickness thicker than a thickness of the edge portion of the grid portion.

Abstract: An image projection apparatus includes: a light source; a projection optical unit including a concave mirror and configured to guide a projection image on a projection surface; an air blower configured to generate a flow of air in a main body casing; a power supply circuit board configured to supply power to an electric component in the main body casing; and a light source drive circuit board configured to drive the light source. At least one of the power supply circuit board and the light source drive circuit board is fixed on a facing surface facing a rear side of the concave mirror, of the main body casing.

Abstract: An image projection apparatus includes: a light source; an exhaust fan configured to discharge air in the apparatus to outside of the apparatus; and a plurality of wind guiding walls extending in a direction perpendicular to an exhaust direction of the exhaust fan, and configured to guide air that has cooled the light source. The wind guiding walls are arranged side by side in a rotation axis direction of the exhaust fan. At least a downstream portion of each of the wind guiding walls in an air flowing direction after cooling the light source, is gradually inclined so as to move away from the exhaust fan in the rotation axis direction of the exhaust fan, toward downstream in the air flowing direction.

Abstract: An image projection apparatus includes: an exhaust fan configured to discharge air in the apparatus to outside of the apparatus; a light source; and a plurality of ducts each having an air intake port facing the light source, and arranged side by side in a rotation axis direction of the exhaust fan. A duct closer to the exhaust fan in a rotation axis direction of the exhaust fan, has a larger flow path sectional area and has an outflow port from which air flows out, placed closer to the light source, in a direction perpendicular to the rotation axis direction of the exhaust fan.

Abstract: A holding structure holds a reflecting mirror. The holding structure includes a reflecting mirror bracket holding the reflecting mirror; a protrusion disposed on the reflecting mirror; a protrusion supporting part disposed on the reflecting mirror bracket and supporting the protrusion; and a spacer disposed between the protrusion supporting part and the reflecting mirror bracket.

Abstract: A projection lens unit includes a plurality of lenses configured to transmit and emit image light generated by an image generating unit using light from a light source; a barrel configured to hold the plurality of projection lenses; and a heat radiator disposed on the barrel and configured to radiate heat of the barrel to an outside.

Abstract: An image projection apparatus includes an image generator configured to use light emitted from a light source to generate an image; a movable member in which the image generator is disposed, the movable member being movably supported; a fixed member being fixed and configured to movably support the movable member; and a mover configured to move the movable member. The mover includes a first pair of actuators facing each other in a first direction across the image generator, and a second pair of actuators facing each other in the second direction across the image generator. The first pair of actuators causes a driving force to operate on the movable member in a direction parallel to a second direction orthogonal to the first direction. The second pair of actuators causes a driving force to operate on the movable member in a direction parallel to the first direction.

Abstract: A light source housing to which a light source lamp having a light emission tube and a reflector is attached includes a pair of flow paths bifurcating onto upper and lower sides of the light emission tube from an air intake port for introducing a cooling air; a flow path open and close unit that slides in a direction of the gravitational force so as to open the flow path on the upper side of the light emission tube and close the flow path on the lower side of the light emission tube; and an air outtake port that outtakes the cooling air introduced into the reflector from the flow path on the upper side of the light emission tube to an outside of the reflector.

Abstract: Disclosed is a cooling device including a blower including an exhaust port; and a radiator including heat radiation fins, wherein the heat radiation fins include a first heat dissipation area and a second heat dissipation area, wherein a first surface area of the heat radiation fins disposed in the first heat dissipation area is greater than that of the heat radiation fins disposed in the second heat dissipation area, wherein the exhaust port of the air blowing part includes first and second exhaust areas for exhausting cooling air, wherein an amount of the cooling air exhausted from the second exhaust area is greater than that of the first exhaust area, and wherein the first heat dissipation area is disposed in the first exhaust area, and the second heat dissipation area is disposed in the second exhaust area.

Abstract: An image projection apparatus includes a casing, a light source unit detachably mounted to the casing, a first connector having a first engagement member, disposed on a housing of the light source unit, a second connector having a second engagement member, disposed on the casing, and one or more supporters disposed at least one of the first connector and the second connector. The first connector is detachably engageable with the second connector. At least one of the first connector and the second connector is moveable in a direction substantially perpendicular to a connection direction of the first connector and the second connector. The one or more supporters guides one of the first engagement member and the second engagement member to the other one of the first engagement member and the second engagement member when engaging the first connector and the second connector.

Abstract: An illumination optical system is provided that is configured to guide light emitted from a light source to an image generation unit that is arranged to be movable in a direction perpendicular to incoming light and is configured to generate an image by reflecting the incoming light. The illumination optical system includes a first lens that is arranged to be movable in a direction perpendicular to an optical axis of the first lens, a second lens that is arranged to be movable in a direction that changes a face-to-face distance between the first lens and the second lens, and a lens position control unit configured to displace the first lens and the second lens.

Abstract: According to an embodiment of the invention, an image projection apparatus includes: a light source device; a first circuit board including an image display device configured to form an image using light, a connector, and an electrically conductive portion near the connector; a retaining member made of metal; an optical illuminating unit held by the retaining member and configured to guide the light to the image display device; an optical projecting unit configured to project the image onto a projection surface; a second circuit board configured to be electrically connected to the connector; a metal plate fixed and electrically connected to the retaining member; and an elastic metal member arranged on the metal plate. The first circuit board is fixed to the retaining member. The elastic metal member is in contact with the electrically conductive portion. The second circuit board is fixed and electrically connected to the metal plate.