Abstract: A projector includes: a display device which modulates illumination light; a projection lens which projects modulation light produced by the display device; and a holding device which has a holder member supporting the display device, a frame member supporting the projection lens and functions as a base capable of supporting the holder member, and an expanding and contracting member disposed between the frame member and the display device, wherein a temperature coefficient for the expansion and contraction of the expanding and contracting member in the direction of the optical axis of the projection lens corresponds to a temperature coefficient for the increase and decrease of the focal distance of the projection lens.

Abstract: A projector includes: a display device which modulates illumination light; a projection lens which projects modulation light produced by the display device; and a holding device which has a holder member supporting the display device, a frame member supporting the projection lens and functions as a base capable of supporting the holder member, and an expanding and contracting member disposed between the frame member and the display device, wherein a temperature coefficient for the expansion and contraction of the expanding and contracting member in the direction of the optical axis of the projection lens corresponds to a temperature coefficient for the increase and decrease of the focal distance of the projection lens.

Abstract: A projector includes: a display device which modulates illumination light; a projection lens which projects modulation light produced by the display device; and a holding device which has a holder member supporting the display device, a frame member supporting the projection lens and functions as a base capable of supporting the holder member, and an expanding and contracting member disposed between the frame member and the display device, wherein a temperature coefficient for the expansion and contraction of the expanding and contracting member in the direction of the optical axis of the projection lens corresponds to a temperature coefficient for the increase and decrease of the focal distance of the projection lens.

Abstract: A projector includes a projection optical device and a projection position adjusting device that includes a fixed member defining a hole having a step portion, a first plate that supports the projection optical device and a second plate disposed between the fixed member and the first plate. The projection position adjusting device further includes a connecting member having a step and being disposed in the hole of the fixed member and connected to the first plate, and an urging member disposed between the connecting member and the step portion of the hole of the fixed member. The urging member urges the step portion of the hole and the step of the connecting member away from each other, and urges the first plate into direct contact with the fixed member.

Abstract: A projector includes a light source device, a optical modulator which modulates luminous flux emitted from the light source device according to image information, a projection optical device which enlarges and projects the luminous flux modulated in the optical modulator, and an outer casing which houses the light source device, the optical modulator and the projection optical device thereinside, in which the outer casing has a ceiling surface and a bottom surface intersecting with respect to the vertical direction and a side surface connecting to the ceiling surface and the bottom surface, in which a concave portion which is recessed toward the inside is formed at the bottom surface side in the side surface, and in which a first connection terminal group connected to an external device through connection cables is arranged at a bottom portion of the concave portion in an exposed state.

Abstract: A projector includes: a projection position adjusting device that adjusts a projection position of a projection optical device. The projection position adjusting device includes: adjusting and driving units that move a first moving plate and a second moving plate. The adjusting and driving unit include: a pair of worms that have a columnar shape and have threads on outer circumferences thereof; and a pair of sliders that are screwed in the pair of worms, respectively. The pair of worms are disposed to extend along the first direction or the second direction. One of the sliders engages with one of moving plates. Engaging structures including inclining engaging holes that extend in a direction crossing the direction in the plane orthogonal to the projecting direction and engaging projections inserted through the inclining engaging holes are provided in the other slider and the other moving plate.

Abstract: A projector includes: a display device which modulates illumination light; a projection lens which projects modulation light produced by the display device; and a holding device which has a holder member supporting the display device, a frame member supporting the projection lens and functions as a base capable of supporting the holder member, and an expanding and contracting member disposed between the frame member and the display device, wherein a temperature coefficient for the expansion and contraction of the expanding and contracting member in the direction of the optical axis of the projection lens corresponds to a temperature coefficient for the increase and decrease of the focal distance of the projection lens.

Abstract: A projector includes a light source, an optical modulation device to form an optical image, a projection optical device, and a projection position adjusting device to adjust the projection position. The projection position adjusting device includes a fixed member, a moving member a dial knob, a drive mechanism that transmit rotation of the dial knob, and a reference position detecting mechanism. The reference position detecting mechanism includes a spiral rail guiding section having a groove shape provided to a side face of the dial knob adjacent to the fixed member, along the rotational direction of the dial knob, a sliding section that slides in the guiding section with the rotation of the dial knob, and an engaging section provided to the guiding section, and engages with the sliding section upon the projection position of the projection optical device reaching the projection reference position.

Abstract: A projector includes a projection optical device that magnifies and projects image light and a projection position adjusting device that moves the projection optical device in a plane orthogonal to a projecting direction and adjusts a projection position of the projection optical device. The projection position adjusting device includes a fixed member fixed in the projector, a first moving plate that supports the projection optical device and moves in a first axial direction and a second axial direction orthogonal to each other in the plane orthogonal to the projecting direction, a second moving plate that is interposed between the fixed member and the first moving plate, engages with the first moving plate, and moves in the second axial direction together with the first moving plate, adjusting and driving units that move the first moving plate and the second moving plate, and plural coupling members that movably couple the first moving plate to the fixed member.

Abstract: A projector includes: a projection position adjusting device that adjusts a projection position of a projection optical device. The projection position adjusting device includes: adjusting and driving units that move a first moving plate and a second moving plate. The adjusting and driving unit include: a pair of worms that have a columnar shape and have threads on outer circumferences thereof; and a pair of sliders that are screwed in the pair of worms, respectively. The pair of worms are disposed to extend along the first direction or the second direction. One of the sliders engages with one of moving plates. Engaging structures including inclining engaging holes that extend in a direction crossing the direction in the plane orthogonal to the projecting direction and engaging projections inserted through the inclining engaging holes are provided in the other slider and the other moving plate.

Abstract: A projector includes a light source device, a optical modulator which modulates luminous flux emitted from the light source device according to image information, a projection optical device which enlarges and projects the luminous flux modulated in the optical modulator, and an outer casing which houses the light source device, the optical modulator and the projection optical device thereinside, in which the outer casing has a ceiling surface and a bottom surface intersecting with respect to the vertical direction and a side surface connecting to the ceiling surface and the bottom surface, in which a concave portion which is recessed toward the inside is formed at the bottom surface side in the side surface, and in which a first connection terminal group connected to an external device through connection cables is arranged at a bottom portion of the concave portion in an exposed state.

Abstract: A projector includes a light source, an optical modulation device that modulates light beam emitted from the light source in accordance with image information to form an optical image, a projection optical device that projects the optical image formed by the optical modulation device in an enlarged manner, a projection position adjusting device that moves the projection optical device in a plane perpendicular to a projection direction to adjust the projection position of the projection optical device, wherein, the projection position adjusting device includes a fixed member fixed to the projector, a moving member capable of moving along the plane perpendicular to the projection direction with respect to the fixed member, a dial knob supported rotatably with respect to the fixed member and operable by a user, a drive mechanism that is engaged with the moving member and the dial knob, and transmits rotation of the dial knob to the moving member to move the moving member, a reference position detecting mechanism

Abstract: A projector includes a sirocco fan 762 as an exhaust fan arranged oppositely to an exhaust hole 2B formed on an exterior case 2 to suck air inside the exterior case 2 and to discharge the air to the outside via the exhaust hole 2B. The sirocco fan 762 is arranged such that a suction side thereof is along a plane orthogonal to an optical path plane defined by a light source device, an optical modulator and a projection optical device of a device body of the projector. Further, the sirocco fan 762 is arranged such that a discharge hole 762A is inclined in a fan rotation direction to discharge the sucked air substantially to the center of an end surface with the exhaust hole 2B formed in a thickness direction. Accordingly, such projector is provided that can enhance an exhaust efficiency by sucking the air of the inside effectively without the rotation number of the exhaust fan increased, and also can reduce the thickness thereof.

Abstract: A projector includes a sirocco fan 762 as an exhaust fan arranged oppositely to an exhaust hole 2B formed on an exterior case 2 to suck air inside the exterior case 2 and to discharge the air to the outside via the exhaust hole 2B. The sirocco fan 762 is arranged such that a suction side thereof is along a plane orthogonal to an optical path plane defined by a light source device, an optical modulator and a projection optical device of a device body of the projector. Further, the sirocco fan 762 is arranged such that a discharge hole 762A is inclined in a fan rotation direction to discharge the sucked air substantially to the center of an end surface with the exhaust hole 2B formed in a thickness direction. Accordingly, such projector is provided that can enhance an exhaust efficiency by sucking the air of the inside effectively without the rotation number of the exhaust fan increased, and also can reduce the thickness thereof.