Kabushiki Kaisha Topcon

Topcon Corporation

Tokyo Kogaku Kikai Kabushiki Kaisha

Satoru Niimura

Takashi Yokokura

Nobuo Hori

Hiroaki Shimozono

Hitoshi Otani

Nobuo Kochi

Toshifumi Mihashi

Katsuhiko Kobayashi

Yoshihiko Hanamura

Masahiro Shibutani

Mineki Hayafuji

Nobusuke Obata

A surface shape measuring apparatus, comprising: a stereo-photographing partfor photographing an objectin stereo; a relative position changing partfor changing the positional relation between the stereo-photographing partand the objectmeansfor storing stereo-photographing parameters in a plurality of directions from which the stereo-photographing partphotographs the objecta stereo-image generating meansfor controlling the stereo-photographing partto photograph the objectfrom the plurality of directions with the stored stereo-photographing parameters and generating stereo images of the objectand a surface shape processing meansfor measuring the surface shape of the objectbased on the stereo images of the object

Surface shape measurement apparatus, surface shape measurement method, surface state graphic apparatus

An ophthalmologic measuring system, comprising a light source unit,for emitting an illuminating light beam for illuminating a fundus of each of both eyes of a person under measurement, a projection optical system,for projecting the illuminating light beam from said light source unit to the fundus of each of the eyes of the person under measurement, a photodetection optical system,including a light blocking member which blocking a part of a reflection light beam coming from the fundus of the eye of the person under measurement and is arranged in an optical path and at approximately conjugate position to a pupil of the eye under measurement so that change occurs in light amount distribution depending on ocular refractive power, a photodetection unit,arranged at approximately conjugate position to the pupil of the eye under measurement and receives photodetection light beam from said photodetection optical system, a storage unit for storing a photodetection signal of said photodetection unit, a control arithmetic unit,for obtaining at least one of interpupillary distances, ocular refractive powers and pupil diameters of the eye under measurement based on the photodetection signal of the photodetection unit, and a display unit,for displaying an anterior ocular segment image of the eye under measurement during measurement period and for displaying over time and at real time the data of interpupillary distance, ocular refractive power and pupil diameter of the eye under measurement, which are results of measurement during measurement period.

Ophthalmologic measuring system

An apparatus for measuring a visual field of a patient, especially characteristics of X ganglion cells, displays a series of targets to a patient. A ramp stimulus is used to measure characteristics of X ganglion cells. A target size setting device sets targets of various sizes. A stimulus intensity changing device changes the intensity of the stimulus in accordance with the size set by the target size setting device. A response device measures the response from the patient, that is, whether the patient senses the target. A memory stores the intensity of stimulus and target size corresponding to the patient's responses.

Perimetric measurement apparatus for measuring characteristics of X

The present invention relates to an ophthalmometric apparatus and is intended to provide an ophthalmometric apparatus that generates image signals representing a section of a measuring portion of a measuring eye. A first light source emits light rays having a comparatively short coherence length, a measuring optical system converges a light beam emitted by the first light source on a position substantially corresponding to the pupil of the measuring eye to illuminate a measuring portion, a beam splitter separates a reference optical path from the measuring optical path of the measuring optical system, a reference optical system including a reflecting mirror reflects a reference light beam, an interference optical system combines a reflected measuring light beam and a reflected reference light beam reflected by the reference optical system for interference, an image pickup device having a plurality of image sensing elements disposed in a substantially conjugate relation with the measuring portion receives an interference light beam provided by the interference optical system, an image signal generating unit generates image signals representing a section of the measuring eye from the output signals of the image pickup device when the reflecting mirror is shifted.

Ophthalmometric apparatus for generating an image of a selection and a

A surgical cutting instrument having an outer tubular member with a closed distal end, and an aperture therein which is adjacent to the closed distal end and which is in communication with the hollow of the outer tubular member. The instrument also includes an inner tube slidably disposed in the outer tube such that it reciprocates between first and second positions. The instrument also has a suction device which draws a portion of an object inwardly through the aperture. The inner tubular member has first and second edges which cooperate with the aperture such that when the suction device draws a first portion of the object into the aperture, the first edge cuts this portion away as the inner tubular member moves from the first position to the second position. However, when the suction device draws a second portion of the object into the aperture, the second edge cuts this portion away as the inner tubular member moves from the first position to the second position.

Surgical cutter

A light wave range finder has a range finding optical system in which the intensity of a coherent beam of light emitted from a coherent light source is modulated and delivered to an object and a reflecting beam of light reflected on the object is received by an light receiving element. A distance to the object is measured based on a phase detection of the reflecting beam of light. The range finding optical system has an optical substrate which is provided with, at least, a light intensity modulating portion for modulating the intensity of a coherent beam of light; an optical path changing portion for changing the coherent beam of light, which has been modulated the intensity by the light intensity modulating portion, between an external range finding optical path and a reference optical path; a first light amount regulating portion for regulating a light amount of the coherent beam of light guided to the external range finding optical path; a delivering system for delivering the coherent beam of light which has been regulated the light amount of the first light amount regulating portion toward an object; and a light receiving system for receiving a reflecting beam of light reflected by the object.

Light wave range finder

A range finder for finding a distance to an object comprising an outgoing light guiding wave path, a reference light guiding wave path, and an incoming light guiding wave path. The finder further comprises wavelength changing means for changing the wavelength of the beam of light emitted from the light source, wavelength detecting means for detecting the wavelength of the beam of light emitted from the light source, and calculating means for detecting at least two peaks of the signal coming from the light receiving element when the wavelength of the light source is changed by the wavelength changing means, finding the wavelengths of the light source, respectively, from the wavelength detecting means at the time when the signal exhibits the two peaks, and calculating the distance to the object according to an operation expression memorized beforehand with reference to such obtained two wavelengths. A total reflection prism, a polarized beam splitter, a quarter-wave plate, and a mode converting device are also provided.

Method and apparatus for finding range

An integrated-photocircuit interferometer (20) comprises a substrate (21) in which coherent light for measurement emitted from a light source (23) is directed through an exit waveguide (22) toward a corner cube prism (34) which can be movable with an object to be measured. The light reflected back from the prism (34) can enter an inlet waveguide (33) having branch waveguides (35, 36) which split the incident measurement light. Part of the light transmitted through the exit waveguide (22) is transferred to reference waveguides (26, 27) which provide different optical path lengths for the light propagated therethrough. The 'reference beams of light' which has been transmitted through the different lengths of optical paths provided by the reference waveguides (26, 27) are introduced into the branch waveguides (35, 36) where interference occurs between the reference beams and the split beams of incident light from the corner cube prism (34). The interference will cause changes in brightness detected by photodetectors (37, 38) as the prism (34) is shifted toward or away from the interferometer (20). Since there is an optical path length difference between the reference waveguides (26, 27), a great number of changes can be detected by the photodetectors for a shift of the prism. Thus, the amount of the shift can be determined to a high resolution. In addition, the relationship in phase between the detected brightnesses will change depending on the direction of movement of the corner cube prism (34). The direction of the prism's movement can thus be detected.

Integrated-photocircuit interferometer

A light interferometer has an interferometer portion for interfering a measuring light and a reference light, and a light signal processing portion for processing a signal according to an interference signal which changes according to the change of an optical path length of the measuring light. The interferometer portion has a first light source for generating a coherent light, a light interference portion for dividing the coherent light emitted by the first light source into a reference light and a measuring light in order to introduce the measuring light to an object, making the measuring light reflected by the object and the reference light interfered with each other and introducing thereof to a photo detector, and an optical path length periodically changing means for periodically changing the difference of an optical path length of the reference light with respect to the optical path length of the measuring light relatively at a constant amplitude. The light signal processing portion has a second light source for generating a coherent light, a collimate lens portion for collimating the coherent light emitted by the second light source, a space modulating portion for diffracting the coherent light outgoing from the collimate lens portion, a Fourier transforming portion for transforming the diffracted coherent light, and two photodetectors disposed on at a spot corresponding to a frequency composition equivalent to a frequency of the optical path length periodically changing means and the other at a spot corresponding to a frequency composition two times the first-mentioned frequency composition in order to extract these frequency compositions out of frequency compositions which have been decomposed in frequency spectral by the Fourier transforming portion.

Growing community of inventors

Tokyo, Japan

Satoru Niimura