Asahi Kogaku Kogyo Kabushiki Kaisha

Pentax Corporation

Atsushi Kida

Toshihiro Nakayama

Masato Hara

Masayuki Sugiura

Atsumi Kaneko

Shigeru Wakashiro

Masami Shirai

Kiyoshi Yamamoto

An optical member inspection apparatus includes an inspection optical system having a light source, and a diffusing means for diffusing the light emitted from the light source. The diffusing means has a central portion and a peripheral portion. The diffusion transmittance of the peripheral portion is higher than the diffusion transmittance of the central portion. The inspection optical system is also provided with an image pick-up means to pick-up an image of the optical member to be inspected, and is positioned so as to receive that light emitted from the light source and transmitted through the diffusing means and the optical member. A judging means is also provided, for judging whether or not the optical member has a defect, in accordance with image signals output from the image pick-up means.

Optical member inspecting apparatus and method of inspection thereof

A target, which is photographed with an object at a spot for a photogrammtric analytical measurement, comprises first, second, third standard point members and assistant point members. The standard point members and the assistant point members are covered by a reflecting sheet. A distance between the first and second standard point members equals a distance between the second and third standard point members. Two assistant point members are positioned on a first straight line connecting the first and second standard point members. One assistant point member is positioned on a second straight line connecting the second and third standard point members. The distance between the first and second standard point members, the distance between the second and third standard point members, and an angle defined by the first and second straight lines, are predetermined.

Target for photogrammetric analytical measurement system

A three points range of high brightness and a four points range of high brightness in a photographed image are selected. It is checked if an identical end point is shared by the three and four points range selected. It is checked if a center of gravity corresponding to the identical end point, a center of gravity corresponding to another end point of the three points rage opposite to the identical end point, and a center of gravity corresponding to another end point of the four points range opposite to the identical end point, meet a positional relationship between standard points of a target.

Device for calculating positional data of standard points of photogrammetric target

A camera is used in a photogrammetric analytical measurement, performing photography at each photographing position, and has a relative-position-detecting system for three-dimensionally detecting a relative-positional relationship between different photographing positions. The relative-position-detecting system is associated with a three-dimensional coordinate system, defined in the camera, such that an origin of the three-dimensional coordinate system is situated at a back principal point of the camera, and is constituted so as to detect the relative-positional relationship between the different photographing positions, with respect to the three-dimensional coordinate system.

Camera for use in photogrammetric analytical measurement

An optical member inspection apparatus includes an inspection optical system having a light source, and a diffusing means for diffusing the light emitted from the light source. The diffusing means has a central portion and a peripheral portion. The diffusion transmittance of the peripheral portion is higher than the diffusion transmittance of the central portion. The inspection optical system is also provided with an image pick-up means to pick-up an image of the optical member to be inspected, and is positioned so as, to receive that light emitted from the light source and transmitted through the diffusing means and the optical member. A judging means is also provided, for judging whether or not the optical member has a defect, in accordance with image signals output from the image pick-up means.

Growing community of inventors

Tokyo, Japan

Atsushi Kida