Canon Kabushiki Kaisha

Yukinobu Okura

Masato Tanaka

Makoto Kojima

Takashi Sukegawa

Tomonao Nakayasu

Yukiya Enokida

Masatsugu Koyama

Tsuyoshi Kitamura

Kosuke Saito

An optical element formed of a plurality of materials includes a middle layer between a base material and a reflecting member so as to suppress stripping, cracking and the like of the optical surface due to the difference in coefficients of thermal expansion among the component materials, in the case where a temperature difference in the service environment or a temperature difference between a manufacturing environment and the service environment is large.

Optical element, spectroscopic apparatus, and method for manufacturing the same

An optical member having a concentric diffraction surface facing the outside, wherein the projection having a inclined surface concentric to the diffraction surface having an angle of inclination &#x3b8; smaller than the angle of inclination &#x3d5; is provided outside the diffraction surface having the largest &#x3d5;, so that an interference of a cutting tool is avoided, and simultaneously, deterioration of a surface roughness may be restrained.

Method of manufacturing a member, optical member and optical element

A diffusing plate includes a microlens array in which a plurality of microlenses are arranged, wherein the microlenses have such a shape that a curvature of a sectional shape including a center line of the microlenses varies depending on a direction of the center line, and wherein microlenses that are different in the direction of a center line where the curvature of the outline is largest are arranged.

Diffusing plate having microlens array

A camera comprises a display member arranged in a finder optical system. The display member is provided in a finder of the camera and is provided with a reflective prism group including a plurality of reflective prisms and a frame line formed to surround the reflective prism group. A shape forming the frame line is constituted by a convex portion, and a ridge line of the convex portion is in a twisted position with respect to a direction of a ridge line of the reflective prism.

Camera having a display member

A method of manufacturing a blazed diffractive grating includes a first step of forming a first groove having a first surface and a second surface by moving, in the first direction at a first position in the second direction, a cutting tool having a first cutting blade and a second cutting blade to cut the object; a second step of forming a second groove by moving, in the first direction at a second position separated from the first position in the second direction by a grating pitch, the cutting tool to cut the object; and a third step of forming a blazed surface of the first groove using the first cutting blade by moving, in the first direction at a third position between the first position and the second position, the cutting tool to cut the first surface of the first groove.

Method of manufacturing blazed diffractive grating and method of manufacturing mold for manufacturing blazed diffractive grating

An Echelle diffraction grating has a Littrow configuration. Each grating includes a resin layer made of light curing resin and having a thickness between 2 &#x3bc;m and 10 &#x3bc;m, and a reflective coating layer formed on the resin layer, having a thickness between 120 nm and 500 nm, and made of aluminum. An apex angle between a blazed surface and a counter surface is between 85&#xb0; and 90&#xb0;. A first blaze angle is an angle that maximizes diffraction efficiency of a set blazed order for incident light of a wavelength of 193.3 nm. A blaze angle has an initial value of a second blaze angle smaller than the first blaze angle. 0.25&#xb0;&#x2266;bd&#x2212;ba&#x2266;1.2&#xb0; is satisfied where bd denotes the first blaze angle and ba denotes the second blaze angle.

Growing community of inventors

Tokyo, Japan

Yukinobu Okura