Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Kazutake Boku

Yoshiharu Yamamoto

Motonobu Yoshikawa

Michihiro Yamagata

Yasuhiro Tanaka

Hiroaki Okayama

Shusuke Ono

Kyoichi Miyazaki

Takayuki Hayashi

Yoshimasa Fushimi

Tomoko Iiyama

Kenichi Hayashi

Shigeki Murata

Tomohiko Sasano

Hironori Nakashima

Shuusuke Ono

Akinori Yusa

Koichiro Hirabayashi

Tetsuya Uno

Keiki Yoshitsugu

Katsu Yamada

Takayuki Kawamura

Ken Morishima

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.

Method of making antireflective roughened surface and lens barrel with roughened surface made by the method

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 arrayconstructed by arranging in parallel a plurality of lens elements having optical power in at least one surface; and an image sensorin 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.

Imaging device including a plurality of lens elements and a imaging sensor

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, and an aperture portionformed in the plate-like portion, wherein the antireflection structure having an aspect ratio ofor 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 wallof the aperture portion

Member having antireflection structure

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.

Imaging lens, imaging unit and optical device

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 (), a first lens element () 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 meniscus lens whose object side has a concave shape, and a third lens element () 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:1.92|&#x3c;3.50.93|&#x3c;2.0&#x2212;2.5&#x3c;()/()&#x3c;&#x2212;1.4&#x2212;1.7&#x3c;()/()&#x3c;&#x2212;1.0.

Imaging lens, imaging unit, and optical device

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. The imaging device operable to output an image of an object as an electrical image signal, comprising: a solid-state imaging sensor including pixels which are two dimensionally arranged on a first flat surface and each of which has a photo-electric conversion function; and a lens array including micro lenses two dimensionally arranged on a second flat surface separately provided so as to be parallel to the first flat surface, in which the solid-state imaging sensor includes an imaging area of unit including a plurality of pixels, and each of the micro lenses forms an optical image of the object on a corresponding imaging area of unit and satisfies a predetermined condition, arctan(L/f)&#x2266;&#x3b8;, for a pixel, from among pixels included in an imaging area of unit corresponding to each micro lens, positioned farthest from an optical axis of a corresponding micro lens. Here, &#x3b8; is a maximum angle of an incident light capable of entering a pixel, f is a focal length of a micro lens, and L is a diameter of a circle circumscribing an imaging area of unit corresponding to one of the micro lenses.

Imaging Device

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 Thus, the diffraction efficiency of the diffraction lens can be calculated easily.

Device for calculating diffraction efficiencies of a diffraction lens, lens with grating element, and optical system for reading

Zoom lens and video camera comprising the same

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.

Display device using transparent type LCD

An optical system that can be used in an optical imaging system and displays good imaging performance with corrected chromatic aberration without increasing the number of lenses is provided by employing a lens surface with a diffractive effect. The optical system uses a lens with a concave incident surface and positive refractive power. A grating element surface 40 with positive refractive power is formed on at least one surface of the lens. The surface on which the grating element is formed is an aspherical surface with a radius of curvature that becomes bigger with increasing distance from the optical axis.

Optical system with grating element and imaging device using the same

A plurality of types of ink having different wavelength characteristics are used for multiple printing of code information. When two or more types of ink are to be printed in an overlapping manner, in a region 8 in which one type of ink 4 and another type of ink 5 are printed in the overlapping manner, the ink 4 and the ink 5 are printed so as not to completely overlap each other by using a checkered pattern 9. As a result, the multiple printing can be performed without strict constraints on the wavelength characteristics of the ink.

Code sheet representing multiple code information and method for

An optical scanner comprising a light source unit, an optical deflector to scan a light beam from the light source unit, a first image formation optical system disposed between the light source unit and the optical deflector, and a second image formation optical system disposed between the optical deflector and the surface to be scanned, wherein the second image formation optical system comprises a first curved mirror to reflect the light beam from the optical deflector and a second curved mirror to focus the light beam from the first curved mirror on the surface to be scanned, having surface shapes of any of the group consisting of the first curved mirror having a toric surface with a convex shape in the main scanning direction, which is the direction a light beam is scanned in, and with a concave shape in the sub scanning direction, which is the direction perpendicular to the main scanning direction, and the first curved mirror having a toric surface with a concave shape in the main scanning direction and a convex shape in the sub scanning direction and a second curved mirror having a toric surface or cylindrical surface without a refractive power or with a concave shape in the main scanning direction, and with a concave shape in the sub scanning direction to focus the light beam from the first curved mirror on the surface to be scanned.

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Osaka, Japan

Kazutake Boku