Abstract: A method of turning the surface of a die, which is used to make a product, into an antireflective roughened one includes the steps of: a) producing a first roughness on the surface of the die; and b) producing a second roughness, which is smaller than the first roughness, on the surface of the die on which the first roughness has already been produced.

Abstract: An object of the present invention is to provide: a thin imaging device in which a high image resolution is obtained and in which the resolution does not uniformly vary even when the shooting distance is changed; and a lens array used therein. The present invention relates to an imaging device comprising: a lens array 130 constructed by arranging in parallel a plurality of lens elements having optical power in at least one surface; and an image sensor 110 in which an optical image formed by an optical system having each of the lens elements is received by each of mutually different imaging regions each having a plurality of photoelectric conversion sections so that the optical image is converted into an electric image signal, wherein each lens element and the imaging region corresponding to the lens element constitute an imaging unit, while the imaging units have diverse imaging region areas. The present invention relates also to a lens array used therein.

Abstract: A method of turning the surface of a die, which is used to make a product, into an antireflective roughened one includes the steps of: a) producing a first roughness on the surface of the die; and b) producing a second roughness, which is smaller than the first roughness, on the surface of the die on which the first roughness has already been produced.

Abstract: A reflection of unnecessary light, which should be prevented, can be suppressed, and occurrence of stray light can be reduced using a member having an antireflection structure, comprising a plate-like portion 2, and an aperture portion 3 formed in the plate-like portion 2, wherein the antireflection structure having an aspect ratio of 1 or more and comprising structural elements arranged in an array form at a period smaller than the shortest wavelength of light, the reflection of which should be prevented, is formed on an inner wall 4 of the aperture portion 3.

Abstract: An imaging lens system for forming an optical image of an object on a light receiving surface of a solid-state image sensor, comprising, in order from an object side, an aperture diaphragm, and three lens elements, i.e., a first lens element which is a bi-aspherical lens having a positive optical power and a convex surface on an image side, a second lens element having a negative optical power and being a bi-aspherical meniscus lens whose object side has a concave shape, and a third lens element having a positive optical power and being a bi-aspherical meniscus lens whose object side has a convex shape.

Abstract: The object is to obtain an imaging lens system having an entire lens system downsized, being excellent in portability, and being compatible with a large number of pixels by which a favorable image quality is provided. Provided is an imaging lens system for forming an optical image of an object on a light receiving surface of a solid-state image sensor, comprising, in order from an object side, an aperture diaphragm (100), a first lens element (101) having a positive optical power and a convex surface on an image side, a second lens element (102) having a negative optical power and being a meniscus lens whose object side has a concave shape, and a third lens element (103) having a positive optical power and being a meniscus lens whose object side has a convex shape, in which the following conditional expressions are satisfied: 1.9<|fd/f2d|<3.5 0.9<|fd/f3d|<2.0 ?2.5<(r201+r202)/(r201?r202)<?1.4 ?1.7<(r301+r302)/(r301?r302)<?1.0.

Abstract: A thin image sensor which is capable of projecting an illuminating light for illuminating an object and has high optical performance is provided. An image sensor (10) includes: a lens array (11) including lens elements (11a) arranged in an array on a plane; an imaging element (13) for converting an optical image into an electrical signal, the imaging element including imaging areas, each of which includes a plurality of photoelectric conversion sections and is operable to receive the optical image; and a light source section (14) for projecting an illuminating light for illuminating an object from which the optical images are to be formed.

Abstract: There is provided an imaging device which is small in light loss, is operable to suppress an occurrence of a stray light, and is operable to provide an image with a high quality as far as a periphery thereof.

Abstract: The object is to obtain an imaging lens system having an entire lens system downsized, being excellent in portability, and being compatible with a large number of pixels by which a favorable image quality is provided. Provided is an imaging lens system for forming an optical image of an object on a light receiving surface of a solid-state image sensor, comprising, in order from an object side, an aperture diaphragm (100), a first lens element (101) having a positive optical power and a convex surface on an image side, a second lens element (102) having a negative optical power and being a meniscus lens whose object side has a concave shape, and a third lens element (103) having a positive optical power and being a meniscus lens whose object side has a convex shape, in which the following conditional expressions are satisfied: 1.9<|fd/f2d|<3.5 0.9<|fd/f3d|<2.0 ?2.5<(r201+r202)/(r201?r202)<?1.4 ?1.7<(r301+r302)/(r301?r302)<?1.

Abstract: There is provided an imaging device which is small in light loss, is operable to suppress an occurrence of a stray light, and is operable to provide an image with a high quality as far as a periphery thereof.

Abstract: The object is to obtain an imaging lens system having an entire lens system downsized, being excellent in portability, and being compatible with a large number of pixels by which a favorable image quality is provided. Provided is an imaging lens system for forming an optical image of an object on a light receiving surface of a solid-state image sensor, comprising, in order from an object side, an aperture diaphragm, and three lens elements, i.e., a first lens element which is a bi-aspherical lens having a positive optical power and a convex surface on an image side, a second lens element having a negative optical power and being a bi-aspherical meniscus lens whose object side has a concave shape, and a third lens element having a positive optical power and being a bi-aspherical meniscus lens whose object side has a convex shape, in which the following conditional expressions are satisfied: 1.5<|fd/f2d|<2.3 0.5<|fd/f3d|<1.1 ?2.2<(r21+r22)/(r21?r22)<?1.3 ?2.1<(r31+r32)/(r31?r32)<?1.

Abstract: A reflection of unnecessary light, which should be prevented, can be suppressed, and occurrence of stray light can be reduced using a member having an antireflection structure, comprising a plate-like portion 2, and an aperture portion 3 formed in the plate-like portion 2, wherein the antireflection structure having an aspect ratio of 1 or more and comprising structural elements arranged in an array form at a period smaller than the shortest wavelength of light, the reflection of which should be prevented, is formed on an inner wall 4 of the aperture portion 3.

Abstract: An imaging apparatus includes an imaging optical system for forming an optical image of an object, the imaging optical system including a focal length adjusting section adjustable a focal length based on an input signal and a plurality of image forming lenses for receiving a light that has transmitted through said focal length adjusting section to form the optical image of the object, and an image sensor for generating an electrical image signal obtained by converting the optical image, wherein a unit is composed of each of the image forming lens and an image taking area on the image sensor having a plurality of light receiving sections for receiving the optical image, and a plurality of units being two-dimensionally arranged, so that it is possible to provide the imaging apparatus with high convenience, which is reduced in thickness, and whose focal length adjustable.

Abstract: A device for calculating diffraction efficiencies of a diffraction lens divided into a plurality of regions, each region comprising at least one grating ring, comprises a first memory for storing information about diffraction efficiencies of the regions; a second memory for storing information about weights corresponding to the regions; and a first processor for retrieving information from the first and the second memory, and calculating diffraction efficiencies of the entire diffraction lens using the formula E j = ? m = 1 M ? W m ? ? mj ( 1 ) wherein: j: integer indicating the order of diffraction light Ej: diffraction efficiency for j-th order diffraction light of the diffraction lens M: positive integer (M>1) indicating the number of regions for which the diffraction efficiency is calculated m: index of the region for which the diffraction efficiency is calculated ?mj: diffraction efficiency for the j-th order diffraction light of the m-th region (stored in the first m

Abstract: A zoom lens includes: a first lens group including a negative lens, a positive lens, and a positive meniscus lens having a convex surface on an object side; a second lens group including a negative lens and a cemented lens composed of a double-concave lens and a positive lens; a third lens group including a positive lens and a negative plastic lens, and having at least one aspherical surface; a fourth lens group including a cemented lens composed of a negative plastic lens and a positive plastic lens, and having at least one aspherical surface. These lenses are arranged in the stated order from an object side.

Abstract: A zoom lens includes: a first lens group including a negative lens, a positive lens, and a positive meniscus lens having a convex surface on an object side; a second lens group including a negative lens and a cemented lens composed of a double-concave lens and a positive lens; a third lens group including a positive lens and a negative plastic lens, and having at least one aspherical surface; a fourth lens group including a cemented lens composed of a negative plastic lens and a positive plastic lens, and having at least one aspherical surface.

Abstract: A zoom lens including a second, third and fourth lens groups (12, 13 and 14) wherein at least one surfaces of the first to fourth lens groups has an aspherical surface, wherein the following relations are satisfied: 9.0<f1/fw<10.5 1.2<|f2/fw|<1.6 4.5<f3/fw<6.0 4.0<f4/fw<5.5 where f1 is a composed focal length of the first lens group, f2 is a composed focal length of the second lens group, f3 is a composed focal length of the third lens group, f4 is a composed focal length of the fourth lens group, and fw is a composed focal length of the entire system at a wide-angle end. Thereby, a compact zoom lens having an excellent aberration performance and a high zoom ratio of 20 times or more can be realized.

Abstract: A device for calculating diffraction efficiencies of a diffraction lens divided into a plurality of regions, each region comprising at least one grating ring, comprises a first memory for storing information about diffraction efficiencies of the regions; a second memory for storing information about weights corresponding to the regions; and a first processor for retrieving information from the first and the second memory, and calculating diffraction efficiencies of the entire diffraction lens using the formula 1 E j = ∑ m = 1 M ⁢ W m ⁢ η mj ( 1 )

Abstract: A device for calculating diffraction efficiencies of a diffraction lens divided into a plurality of regions, each region comprising at least one grating ring, comprises a first memory for storing information about diffraction efficiencies of the regions; a second memory for storing information about weights corresponding to the regions; and a first processor for retrieving information from the first and the second memory, and calculating diffraction efficiencies of the entire diffraction lens using the formula E j = ∑ m = 1 M ⁢ W m ⁢ η mj ( 1 )

Abstract: A display device comprises a transparent type LCD including a pair of transparent plates facing each other, spaced with a predetermined gap and a polymer dispersed liquid crystal disposed between the transparent plates, which can be switched between a transparent state and a diffraction state pixel by pixel to display images or characters; a signal generator for giving display signals to the transparent type LCD; and a light system including a light source emitting light rays that enter the transparent plates from their edge faces, and a stop plate disposed between the edge faces of the transparent plates and the light source. This stop plate has an opening that extends along the longitudinal direction of the edge face of the transparent plate, and the width of the opening in the cross direction changes cyclically along the longitudinal direction.