Abstract: A fixing device that fixes, to a light emitting device that emits light, a lens barrel included in a projection optical device and holding a plurality of lenses includes a first tube member, a contact section provided on an outer side of the first tube member and in contact with a holding section included in the light emitting device, and a pressing mechanism provided to be opposed to the contact section and configured to press the holding section toward the contact section when the fixing device is attached to the light emitting device.

Abstract: A projection apparatus (projector) includes a light source apparatus, an image generation unit that generates image light from the light from the light source apparatus, a projection optical system that projects the image light, a reflective optical element (reflection mirror) that forms the projection optical system, deflects back the image light, and causes the deflected image light to exit, a projection optics enclosure that accommodates the projection optical system, and a first opening section formed in the projection optics enclosure so as to open in the position of the reflective optical element (reflection mirror).

Abstract: A fixing device that fixes, to a light emitting device that emits light, a lens barrel included in a projection optical device and holding a plurality of lenses includes a first tube member, a contact section provided on an outer side of the first tube member and in contact with a holding section included in the light emitting device, and a pressing mechanism provided to be opposed to the contact section and configured to press the holding section toward the contact section when the fixing device is attached to the light emitting device.

Abstract: A projection optical apparatus is removably installed in a light emitting apparatus and projects light emitted from the light emitting apparatus. The projection optical apparatus includes a plurality of lenses, a lens barrel holding the plurality of lenses, and a first grip extending outward from the exterior of the lens barrel.

Abstract: A mounting member mounts an imaging apparatus on a projection optical apparatus that projects image light. The mounting member includes a first plate part to which the imaging apparatus is fixed, the first plate part having a shape of a planar plate, and a second plate part having a shape of a planar plate and extending from the first plate part, the second plate part being fixed to the projection optical apparatus. The first plate part has a first surface and a second surface opposite from the first surface. The second plate part is disposed on the side facing the second surface. The first surface is a placement surface where the imaging apparatus is placed.

Abstract: A projection apparatus (projector) includes a light source apparatus, an image generation unit that generates image light from the light from the light source apparatus, a projection optical system that projects the image light, a reflective optical element (reflection mirror) that forms the projection optical system, deflects back the image light, and causes the deflected image light to exit, a projection optics enclosure that accommodates the projection optical system, and a first opening section formed in the projection optics enclosure so as to open in the position of the reflective optical element (reflection mirror).

Abstract: A optical projection device disposed close to a projection surface and capable of further widening an angle is provided. A optical projection device includes first optical system including lens groups movable and second optical system reflecting light emitted from the first optical system. The first optical system includes first lens frame which holds first lens group positioned at side closest to the second optical system among the movable lens groups and includes cam pin, guide barrel which includes straight groove, cam barrel which includes cam groove with which the cam pin is engaged, the first lens frame includes frame protruding portion protruding from the cam barrel to second optical system side and holding the first lens group, and notch is provided in such way that portion is formed to be cut out at side through which light reflected by the second optical system passes, in the frame protruding portion.

Abstract: A projection optical device includes a fourth lens group movable along an optical axis, a fifth lens group provided in a position maintained within the projection optical device, a fourth lens frame holding the fourth lens group and having cam pins, a guide tube having a rectilinear groove, the cam pins inserted into the rectilinear groove, and a cam tube rotated with respect to the guide tube to guide the cam pins with the rectilinear groove and the cam groove, and moving the fourth lens frame along the optical axis, wherein the cam pins are formed on an upstream side in an optical path of the fourth lens group in a direction along the optical axis, and the fifth lens group is provided on the upstream side in the optical path of the fourth lens group.

Abstract: A projection lens includes a lens group holding tube including lenses on the side facing the inner circumference of the lens group holding tube, a cam tube that supports the lens group holding tube movably in the optical axis direction, and a guide tube that supports the cam tube rotatably around the optical axis. The lens group holding tube includes a guide pin that protrudes outward from the lens group holding tube. The cam tube has a cam hole which inclines with respect to the optical axis direction along the circumferential direction and through which the guide pin passes. The guide tube includes a guide groove which extends in the optical axis direction and into which the guide pin is so inserted as to pass through the inner circumference of the guide groove and a flange that protrudes outward.

Abstract: A projection lens includes a plurality of lens groups each formed of at least one lens, and a lens barrel adapted to support each of the lens groups from an outer circumferential side. The lens barrel includes a first temporarily holding mechanism allowing the first lens group located at an end on a enlargement side to be displaced in a direction perpendicular to the optical axis, a first adhesive applied to the first temporarily holding mechanism to fix the first lens group so as to be unable to be displaced, a second temporarily holding mechanism allowing the seventh lens group located at an end on a reduction side to be displaced in a direction perpendicular to the optical axis, and a second adhesive applied to the second temporarily holding mechanism to fix the seventh lens group so as to be unable to be displaced.

Abstract: A projection lens includes a plurality of lens groups each formed of at least one lens, and a lens barrel adapted to support each of the lens groups from an outer circumferential side. The lens barrel includes a first temporarily holding mechanism allowing the first lens group located at an end on a enlargement side to be displaced in a direction perpendicular to the optical axis, a first adhesive applied to the first temporarily holding mechanism to fix the first lens group so as to be unable to be displaced, a second temporarily holding mechanism allowing the seventh lens group located at an end on a reduction side to be displaced in a direction perpendicular to the optical axis, and a second adhesive applied to the second temporarily holding mechanism to fix the seventh lens group so as to be unable to be displaced.

Abstract: A projection lens includes a lens group holding tube including lenses on the side facing the inner circumference of the lens group holding tube, a cam tube that supports the lens group holding tube movably in the optical axis direction, and a guide tube that supports the cam tube rotatably around the optical axis. The lens group holding tube includes a guide pin that protrudes outward from the lens group holding tube. The cam tube has a cam hole which inclines with respect to the optical axis direction along the circumferential direction and through which the guide pin passes. The guide tube includes a guide groove which extends in the optical axis direction and into which the guide pin is so inserted as to pass through the inner circumference of the guide groove and a flange that protrudes outward.

Abstract: A optical projection device disposed close to a projection surface and capable of further widening an angle is provided. A optical projection device includes first optical system including lens groups movable and second optical system reflecting light emitted from the first optical system. The first optical system includes first lens frame which holds first lens group positioned at side closest to the second optical system among the movable lens groups and includes cam pin, guide barrel which includes straight groove, cam barrel which includes cam groove with which the cam pin is engaged, the first lens frame includes frame protruding portion protruding from the cam barrel to second optical system side and holding the first lens group, and notch is provided in such way that portion is formed to be cut out at side through which light reflected by the second optical system passes, in the frame protruding portion.

Abstract: A optical projection device that projects an image with excellent image quality while achieving miniaturization is provided. The optical projection device includes a first lens frame holding a first lens group L1 and including a cam pin, a guide barrel including a straight movement groove, a cam barrel including a cam groove, and an urging portion that urges the first lens frame in a direction intersecting with the direction along an optical axis. The cam pin is formed at a position spaced apart from a center of gravity including the first lens frame and members attached to the first lens frame in the direction along the optical axis Ax and the urging portion urges the first lens frame at a position closer than the cam pin with respect to the center of gravity in the direction along the optical axis.

Abstract: A feeding mechanism is used to adjust the distance between a reduction side lens group and an object plane for back focus adjustment. A rotation angle adjustment mechanism capable of rotating action independent of rotating action performed in the back focus adjustment is used to adjust the rotation angle by which at least part of the reduction side lens group is rotated.

Abstract: A projection optical system capable of, for example, in application to a projector that performs short-throw projection, facilitating position adjustment of lenses (in particular, focus position adjustment in a manufacturing process) and a projector in which the projection optical system is used. A rotation restricting section is provided that is capable of restricting rotation ranges of a cam in focus position adjustment (position adjustment among lenses) during a manufacturing process according to rotating motions of the cam in a lens-barrel guide cylinder and a position-adjustment cam cylinder.

Abstract: A optical projection apparatus including a refractive system and a reflective system includes a optical projection enclosure and a light transmissive plate, which transmits projection light. The optical projection enclosure includes a light transmissive plate holding section. An interposing member (a first interposing member, a second interposing member) having elasticity is provided between the light transmissive plate and the holding section, and the interposing member covers the entirety of divided portions of the holding section. The first interposing member is disposed in the holding section or on a side section of the light transmissive plate, and the second interposing member is disposed on an outer circumferential end surface of the light transmissive plate. The interposing member is pressed by the light transmissive plate and held in the light transmissive plate holding section.

Abstract: A projection optical device includes a fourth lens group movable along an optical axis, a fifth lens group provided in a position maintained within the projection optical device, a fourth lens frame holding the fourth lens group and having cam pins, a guide tube having a rectilinear groove, the cam pins inserted into the rectilinear groove, and a cam tube rotated with respect to the guide tube to guide the cam pins with the rectilinear groove and the cam groove, and moving the fourth lens frame along the optical axis, wherein the cam pins are formed on an upstream side in an optical path of the fourth lens group in a direction along the optical axis, and the fifth lens group is provided on the upstream side in the optical path of the fourth lens group.

Abstract: A projector used a projection lens to enlarge and project image light generated by image generator. When it is assumed that the on-optical-axis position of a lens surface where the maximum of light ray passage ranges (effective diameter) is minimized in the projection lens is a minimum diameter position, a stop is provided on a lens shifted from the minimum diameter position toward the light exiting side. The lens on which the stop is provided is a lens (for example, fourth lens closest to minimum diameter position) that satisfies 0.8?1??2??1, where ?1 represents the light flux diameter on a surface where the on-axis light flux diameter is maximized, and ?2 is the diameter of the stop.

Abstract: A optical projection device that projects an image with excellent image quality while achieving miniaturization is provided. The optical projection device includes a first lens frame holding a first lens group L1 and including a cam pin, a guide barrel including a straight movement groove, a cam barrel including a cam groove, and an urging portion that urges the first lens frame in a direction intersecting with the direction along an optical axis. The cam pin is formed at a position spaced apart from a center of gravity including the first lens frame and members attached to the first lens frame in the direction along the optical axis Ax and the urging portion urges the first lens frame at a position closer than the cam pin with respect to the center of gravity in the direction along the optical axis.