Fuji Photo Optical Co., Ltd.

Other

Fujinon Corporation

Kenji Yasuda

Kiyoshi Suzuki

Masami Yoneda

Shigeru Itamoto

Shinichi Matsuda

Naoki Ozawa

Masanobu Shigeta

Masane Suzuki

Satoru Moriya

Shigenori Ohi

Kenichi Noguchi

Toshiya Sakuma

Yoshio Kojima

Atsushi Enomoto

Senji Mikami

The present invention makes it possible to reliably hold a computer-generated hologramand a sample surfacein ideal design positions and to perform interference measurements on the surface shape of the sample surfaceby holding the computer-generated hologramin a predetermined attitude by using a retaining member, and interposing a spacerbetween this retaining member and the object so that relative positioning of both the computer-generated hologramand the sample surfaceis performed. Light transmission type targets used for alignment are respectively disposed on the four corners of the frame body of the CGHand the four corners of the measurement mirror, and the system is devised so that images of these targets can be obtained by an image focusing lensand CCD camera, thus making it possible to check the adjustment of the alignment of the CGHand sample surface

Light interference measurement method using computer-generated hologram, and interferometer using this method

An optical device has a light-transmitting optical substrate formed with a multilayer film and a barrier layer disposed on the multilayer film side thereof. The light-transmitting optical substrate has a refractive index N (at a reference wavelength of 632.8 nm) falling within the range of 1.7&lE;N &lE;1.9, whereas the barrier layer has a refractive index N (at a reference wavelength of 632.8 nm) falling within the range of &minus;0.1&lE;N &minus;N &lE;0.1.

Optical device with barrier layer, optical system, and projector apparatus

A method for interference fringe analysis in which a subject surface is located in parallel to a reference surface and multiply step shifted a specific distance for each step to derive data and images of interference fringes for determining aspects of the geometry of the subject surface.

Method of interference fringe analysis for determining aspect of surface

Disclosed herein is an interferometric surface inspection machine which is arranged to facilitate the inspection of finished spherical lens surfaces, and which essentially includes: a surface plate formed with a through light guide opening in a predetermined position; an up-down guide means suspended from the lower side of the surface plate; an interferometer liftably supported on the up-down guide means and having a reference lens with a reference surface thereof disposed on the side of the light guide opening and in face to face relation with said light guide opening; and a lens mount portion adjustably located in a predetermined position above the light guide opening in the surface plate and adapted to support peripheral edge portions of a spherical lens element on the side of the lens surface to be inspected.

Interferometric surface inspection machine designed to support an

A device for attraction holding a measurement object in an interferometer comprises a holding surface having holes and an air chamber communicating with the holes through suction passages formed between the holding surface and air chamber so as to attract and hold an object on the holding surface by exhausting the air from the air chamber. The air chamber is sealed by at least one flexible member which is deformed when an excessive negative pressure is established in the air chamber, so as to prevent distort or deformation of the holding surface, and hence the object held thereon.

Attraction holding device

A device for holding a measurement object e.g. in interferometers comprises a base plate and an attraction plate mounted on the base plate so as to attract the object placed on an upper surface of the attraction plate to the base plate together with the attraction plate by a vacuum applied via attraction grooves formed on the base plate and attraction passages perforated through the attraction plate. The upper surface of the base plate is formed as a reflection plane, and the attraction plate is made of a transparent material, so that Newton's rings generated by light reflected from the upper surface of the base plate and light reflected from the lower surface of the attraction plate can be observed from above the attraction plate.

An instrument for measuring the amplitude of vibration of a vibrating object consists of a first optical system for periodically projecting the image of a grating onto the vibrating object and second optical system having an optical axis intersecting that of the first optical system in the vicinity of the object, for sharing the image projected on and reflected from the object and recording the shared image on a photographic film. The measurement of the amplitude is obtained in the form of a moire pattern.

Growing community of inventors

Saitama, Japan

Kenji Yasuda