Abstract:
The purpose of the present invention is to provide: a retardation film which uses a low-substituted cellulose ester and has improved retardation after saponification and improved wet heat stability of internal haze; a polarizing plate which uses the retardation film; and a liquid crystal display device. An optical film of the present invention contains a cellulose ester and a compound represented by general formula (1), and is characterized in that the compound has an average degree of substitution within the range of 3.0-6.0 and contains a component having a degree of substitution of 4 or less in an amount of 30-80% by mass (inclusive). (In the formula, R1-R8 each represents a substituted or unsubstituted alkylcarbonyl group or a substituted or unsubstituted allylcarbonyl group, and R1-R8 may be the same as or different from one another.)
Abstract:
A variable-focal-length lens system for projection which achieves focusing by movement of the entire system has a second to a fourth lens group as focal-length-varying lens groups and a first lens group as a distance-compensation lens group. The second to fourth lens groups individually move in the optical axis direction to vary the group-to-group distances so as to vary the focal length of the entire system. During focusing, the first lens group moves in the optical axis direction such that, as the projection distance varies from a remote distance to a close distance, curvature of field varies to the under side.
Abstract:
There are disclosed a film mirror, which can be prevented from decrease in specular reflectance when a silver layer that serves as a reflective layer is deteriorated, is lightweight and flexible, can be produced at low cost, can have an enlarged surface area, can be produced on a large scale, exhibits excellent light stability and weather resistance, and exhibits good specular reflectance to solar light; a process for producing the film mirror; and a reflection device for solar power generation, which is equipped with such a film mirror. The film mirror comprises at least an adhesive layer, a silver reflection layer and an upper adjacent layer as constituent layers provided on the resin substrate sequentially in this order, in which at least the upper adjacent layer contains a binder and a corrosion inhibitor for silver.
Abstract:
The invention provides a film mirror having excellent regular reflectance to solar heat, and exhibiting excellent light resistance and weather resistance, which is possible to sufficiently suppress regular reflectance decline; is lightweight and flexible; and can be large-area- and mass-produced at low cost, employing it as a film mirror for solar heat power generation under severe environment for long duration, and provides a manufacturing method and a reflection device for solar heat power generation thereof. A film mirror possessing a resin substrate and provided thereon, a silver reflection layer and a layer possessing at least one UV absorbent, provided on a light incidence side beyond the resin substrate and the silver reflection layer, wherein the at least one UV absorbent satisfies Aa≧1.2×Ab. Aa represents absorbance at an absorption maximum peak in 260-320 nm, and Ab represents absorbance at an absorption maximum peak in 321-400 nm.
Abstract:
A video display device is provided with a light source, a display element, and an eyepiece optical system (14). The light source emits light which has at least one emission peak wavelength and has a wavelength width including one emission peak wavelength. The display element modulates the light emitted from the light source and displays video. The eye-piece optical system (14) comprises a volume phase reflective HOE (23) with diffracts and reflects video light from the display element and leads the light to a viewing pupil. An HOE surface (23a) is divided into a plurality of flat surfaces (31, 32, 33) disposed so as to be recessed on the viewing pupil side, and the plurality of flat surfaces (31, 32, 33) are continuous so as to have a common ridge line at a boundary between the flat surfaces adjoining to each other.
Abstract:
A probe includes an optical system which irradiates a site of a biological tissue and receives light emitted from the site, and an imaging device. The imaging device is disposed ahead of the optical system closer to the end of the probe. The probe rotates the incident direction of the light and the imaging direction of the imaging device around a rotation axis directed to the longitudinal direction of the probe while fixing an angle between the incident direction and the imaging direction. The optical system receives the light from the site which always falls in the field of view of the imaging device, or brought with a time lag into the field of view of the imaging device as a result of rotation, the light being incident in the direction normal to, or inclined away from the rotation axis.
Abstract:
An image projection apparatus has a corrector that corrects angle distribution of illumination light such that, let, in a comparison in traveling direction between, of diffracted light resulting from light rays with the wavelengths λ1 and λ2 along the illumination optical axis being diffracted on an on-state digital micromirror device, λ1 diffracted light traveling in a direction closest to a traveling direction of the mirror-reflected light and λ2 diffracted light traveling in a direction closest to the traveling direction of the mirror-reflected light, the λ1 diffracted light be diffracted to a position farther away from the mirror-reflected light than the λ2 diffracted light, the angle distribution of the illumination light includes at least an angle distribution that fulfills conditional formula (1): Fλ2
Abstract:
To provide an image pickup lens with a five-lens configuration in which aberrations are corrected favorably despite its compactness. An image pickup lens 10 includes a first lens L1 having a positive refractive power and having a convex face directed to an object side, a second lens L2 of a meniscus shape having a negative refractive power and having a concave face directed to an image side, a third lens L3 having a positive refractive power, a fourth lens L4 having a positive refractive power and having a convex face directed to the image side, and a fifth lens L5 having a negative refractive power and having a concave face directed to the image side, in this order from the object side. Here, the focal length of the fifth lens, the focal length of the entire system of the image pickup lens, and an air separation on an optical axis between the fourth lens and the fifth lens satisfy predetermined conditions.
Abstract:
Provided is a cellulose acetate film which has excellent retardation properties and exhibits low haze even under high-temperature and high-humidity conditions and which, in an alkaline saponification step, causes little dissolution of the film itself or additives in a saponifying liquid. The cellulose acetate film is characterized by comprising: a cellulose acetate which has an acetyl substitution degree of 2.0 to 2.5; and 5 to 15% by mass (relative to the cellulose acetate) of a component which contains a compound represented by general formula (1) wherein m is 0 and a compound represented thereby wherein in is more than 0 at a ratio of 45:55 to 0:100. In general formula (1), G is a mono- or di-saccharide residue; X1 is —O—; R1 is —CO—R2; R2 is an aliphatic or aromatic group; m represents the total number of hydroxyl groups directly bonded to the mono- or di-saccharide residue; and n represents the total number of OR1 groups directly bonded to the mono- or di-saccharide residue, with the proviso that m and n satisfy fee relationships: 3≦m+n≦8 and n is not 0.
Abstract:
An imaging device having an optical imaging system which has a parallel plate which is transparent at least in a visible light region, is joined by adhesives and is held on a holding member, wherein the holding member including: an opening section which is provided in order to pass light rays from the optical imaging system; a holding surface for holding a periphery of the parallel plate, formed around the opening section in a square shape, and intersecting perpendicularly to an optical axis of the optical imaging system; a side wall which is provided to stand parallel to the optical axis at an outside with respect to the opening section of the holding surface; and an adhesive collecting section which is arranged in each of four corners of the holding surface and is hollowed from the holding surface.