Abstract: An illumination imaging device includes a combination of a polarizing plate, which is a grid polarizer, and a wave plate is provided at the intersection of an optical axis of a first light source that emits light and an optical axis of an imaging member. The light emitted from the first light source is reflected by the polarizing plate, is transmitted through the wave plate, and is fed to an object. The optical axis of the first light source and the optical axis of the imaging member coincide with each other. Therefore, a clear bright-pupil image is acquired by the imaging member.

Abstract: A projection display apparatus has a light source, an image forming device for modulating light emitted from the light source with an image signal supplied thereto, and a reflective optical system for magnifying and projecting an image generated by the image forming device. The reflective optical system has a first reflecting mirror for reflecting light emitted from the image forming device and initially applied thereto, and a plurality of reflecting mirrors for successively reflecting the light reflected by the first reflecting mirror. The first reflecting mirror has a spherical reflecting surface, and a normal line passing through the crest of the spherical reflecting surface and a normal line passing through the image forming device extend nonparallel to each other.

Abstract: To provide a high-brightness, small, low-cost optical apparatus which covers a wide-angle to super-wide-angle region and which reliably corrects various aberrations with a small number of lenses. At least one negative lens unit 1, a meniscus lens 2 that is convex on an object side, an aperture stop S, and a double-convex positive lens 3 are arranged in order from the object side. At least one of the lenses positioned on the object side of the aperture stop S and the positive lens 3 include respective aspherical surfaces.

Abstract: An actuator includes a holder having a movement hole, a lens barrel which moves within the movement hole, and driving means for driving the lens barrel. Each of the driving means is provided with driving members composed of an artificial muscle. The lens barrel can be suitably moved within the movement hole by making the driving members perform a predetermined operation.

Abstract: [Object] To provide a high-brightness, small, low-cost optical apparatus which covers a wide-angle to super-wide-angle region and which reliably corrects various aberrations with a small number of lenses. [Solving Means] At least one negative lens unit 1, a meniscus lens 2 that is convex on an object side, an aperture stop S, and a double-convex positive lens 3 are arranged in order from the object side. At least one of the lenses positioned on the object side of the aperture stop S and the positive lens 3 include respective aspherical surfaces.

Abstract: A front group is formed of a negative first lens as a meniscus lens which is convex at the object side and a negative second lens, and a rear group is formed of a biconvex positive third lens, an aperture stop, a negative fourth lens and a biconvex positive fifth lens. The first lens is a glass lens, and the second lens is a plastic aspherical lens. The following conditions are satisfied: ?2.4<fI/f<?1.55, 0.15<f2/f1<0.35, va<29, and vb>50, where f denotes a focal distance of a whole system, f1 denotes a focal distance of the first lens, f2 denotes a focal distance of the second lens, fI denotes a focal distance of the front group, va denotes an average value of abbe numbers of the third and the forth lenses, and vb denotes an average value of abbe numbers of the rest of the lenses.

Abstract: A front group is formed of a negative first lens as a meniscus lens which is convex at the object side and a negative second lens, and a rear group is formed of a biconvex positive third lens, an aperture stop, a negative fourth lens and a biconvex positive fifth lens. The first lens is a glass lens, and the second lens is a plastic aspherical lens. The following conditions arc satisfied: ?2.4<fI/f<?1.55, 0.15<f2/f1<0.35, va<29, and vb>50, where f denotes a focal distance of a whole system, f1 denotes a focal distance of the first lens, f2 denotes a focal distance of the second lens, fI denotes a focal distance of the front group, va denotes an average value of abbe numbers of the third and the forth lenses, and vb denotes an average value of abbe numbers of the rest of the lenses.

Abstract: When a voltage is applied between outside electrodes and a common electrode that constitute driving parts of a driving unit provided between a holder holding a lens and a lens barrel, as shown in FIG. 9, respective dielectric elastomers provided in the driving parts are slightly deformed in a direction that is crushed in an X1–X2 direction. Thus, the entire lens can be slightly moved in the direction of an arrow (X2-direction). This enables an optical axis O?—O? of the lens to coincide with or get closer to a reference optical axis.

Abstract: A luminous flux, from one conjugate surface (A), having an opening angle of at least 10° sequentially passes through a first optical system (30) having a luminous flux convergent action in the vicinity of its reference axis and a second optical system (31) having a luminous flux divergent action in the vicinity of its reference axis, and converges on another conjugate surface (B). A specific condition is given to the converging distance of each converging point at a luminous flux section including a principal ray according to the v passing position of the luminous flux through the first optical system (30) to thereby implement an oblique-incident optical system having a half angle of at least 60° and a comparatively simple structure irrespective of a type of an optical element used.

Abstract: A projection display apparatus has a light source, an image forming device for modulating light emitted from the light source with an image signal supplied thereto, and a reflective optical system for magnifying and projecting an image generated by the image forming device. The reflective optical system has a first reflecting mirror for reflecting light emitted from the image forming device and initially applied thereto, and a plurality of reflecting mirrors for successively reflecting the light reflected by the first reflecting mirror. The first reflecting mirror has a spherical reflecting surface, and a normal line passing through the crest of the spherical reflecting surface and a normal line passing through the image forming device extend nonparallel to each other.

Abstract: A low-cost bright image-pick up lens of a small size is provided which is short in total length, wherein the angle of field is beyond 30°; the angle of incidence onto the image pickup device is narrowed; and various aberrations are appropriately corrected. The image-pick up lens comprises, from the side of an object, an aperture stop, a biconvex positive lens, and a meniscus lens having a concave surface on the object side, and each of the lenses includes at least one aspheric surface.

Abstract: A luminous flux, from one conjugate surface (A), having an opening angle of at least 10° sequentially passes through a first optical system (30) having a luminous flux convergent action in the vicinity of its reference axis and a second optical system (31) having a luminous flux divergent action in the vicinity of its reference axis, and converges on another conjugate surface (B). A specific condition is given to the converging distance of each converging point at a luminous flux section including a principal ray according to the v passing position of the luminous flux through the first optical system (30) to thereby implement an oblique-incident optical system having a half angle of at least 60° and a comparatively simple structure irrespective of a type of an optical element used.

Abstract: An actuator includes a holder having a movement hole, a lens barrel which moves within the movement hole, and driving means for driving the lens barrel. Each of the driving means is provided with driving members composed of an artificial muscle. The lens barrel can be suitably moved within the movement hole by making the driving members perform a predetermined operation.

Abstract: When a voltage is applied between outside electrodes and a common electrode that constitute driving parts of a driving unit provided between a holder holding a lens and a lens barrel, as shown in FIG. 9, respective dielectric elastomers provided in the driving parts are slightly deformed in a direction that is crushed in an X1-X2 direction. Thus, the entire lens can be slightly moved in the direction of an arrow (X2-direction). This enables an optical axis O?-O? of the lens to coincide with or get closer to a reference optical axis.

Abstract: A bright, small, and inexpensive imaging lens system is provided with a short total length that can provide more than a 30 degree viewing angle and whose aberrations are excellently corrected. The imaging lens includes, in order from an object side, a positive first lens with a convex surface facing the object side, an aperture stop provided on the object side or an image side of the first lens, a meniscus second lens with a concave surface facing the object side, and a meniscus third lens with a convex surface facing the object side. Furthermore, at least one of the first lens and the second lens includes an aspheric surface, and the third lens is a biaspheric lens. In addition, the second lens and the third lens have paraxial focal lengths whose signs are different. When v max and v min are the maximum Abbe number and the minimum Abbe number among the lenses, respectively, the condition, 1.25<v max/v min, is satisfied.

Abstract: A luminous flux, from one conjugate surface (A), having an opening angle of at least 10° sequentially passes through a first optical system (30) having a luminous flux convergent action in the vicinity of its reference axis and a second optical system (31) having a luminous flux divergent action in the vicinity of its reference axis, and converges on another conjugate surface (B). A specific condition is given to the converging distance of each converging point at a luminous flux section including a principal ray according to the passing position of the luminous flux through the first optical system (30) to thereby implement an oblique-incident optical system having a half angle of at least 60° and a comparatively simple structure irrespective of a type of an optical element used.

Abstract: A luminous flux, from one conjugate surface (A), having an opening angle of at least 10° sequentially passes through a first optical system (30) having a luminous flux convergent action in the vicinity of its reference axis and a second optical system (31) having a luminous flux divergent action in the vicinity of its reference axis, and converges on another conjugate surface (B). A specific condition is given to the converging distance of each converging point at a luminous flux section including a principal ray according to the passing position of the luminous flux through the first optical system (30) to thereby implement an oblique-incident optical system having a half angle of at least 60° and a comparatively simple structure irrespective of a type of an optical element used.

Abstract: For a positive lens having a convex surface on an image side thereof and a diaphragm provided on an object side thereof, the following conditions are satisfied when a surface of the lens at least on the image side is aspheric, a focal length is f, a distance from the diaphragm to a front surface of the lens is D0, and a thickness of the lens is D1: 0.2<D0/f<0.8, 1.2<(D0+D1)/f, and 0.4<R2/f<1.0.

Abstract: A luminous flux, from one conjugate surface (A), having an opening angle of at least 10° sequentially passes through a first optical system (30) having a luminous flux convergent action in the vicinity of its reference axis and a second optical system (31) having a luminous flux divergent action in the vicinity of its reference axis, and converges on another conjugate surface (B). A specific condition is given to the converging distance of each converging point at a luminous flux section including a principal ray according to the passing position of the luminous flux through the first optical system (30) to thereby implement an oblique-incident optical system having a half angle of at least 60° and a comparatively simple structure irrespective of a type of an optical element used.

Abstract: A bright, small, and inexpensive imaging lens system is provided with a short total length that can provide more than a 30 degree viewing angle and whose aberrations are excellently corrected. The imaging lens includes, in order from an object side, a positive first lens with a convex surface facing the object side, an aperture stop provided on the object side or an image side of the first lens, a meniscus second lens with a concave surface facing the object side, and a meniscus third lens with a convex surface facing the object side. Furthermore, at least one of the first lens and the second lens includes an aspheric surface, and the third lens is a biaspheric lens. In addition, the second lens and the third lens have paraxial focal lengths whose signs are different. When v max and v min are the maximum Abbe number and the minimum Abbe number among the lenses, respectively, the condition, 1.25<v max/v min, is satisfied.