Tokyo Kogaku Kikai Kabushiki Kaisha

Kabushiki Kaisha Topcon

Kiwami Horiguchi

Yasuo Kato

Ikuo Kitao

Susumu Takahashi

Shinji Wada

Fumio Ohtomo

Yasufumi Fukuma

Yoshihiro Takahashi

Hitoshi Ohtani

Kiichi Kamiyama

Masayuki Masuyama

Minoru Kamiya

The present invention relates to both a surveying apparatus with a picking-up device and a electronic storage medium, and particularly to a surveying apparatus capable of combining a background image captured by a picking-up device with survey data obtained by the surveying apparatus and displaying the combined image on a display unit, wherein the surveying apparatus is configured such that the picking-up device can be connected to the surveying apparatus, the picking-up device having an optical axis approximately parallel with an optical axis of the surveying apparatus, the surveying apparatus comprising: an operation unit for associating measurement data obtained by the surveying apparatus with image data obtained by the picking-up device and displaying a measurement target position mark in the image data; a first storage unit for storing the measurement data associated with the image data; a second storage unit for storing the image data associated with the measurement data; and a display unit for, when necessary, displaying at least one of the measurement data and the image data stored in the first storage unit and the second storage unit, respectively.

Surveying apparatus

An eye refractive power measuring apparatus is disclosed. It includes a chart projection system for projecting a chart image for test use to a retina of an eye under test by using visible light, a measuring target projection system for projecting a measuring target image to the retina of the eye under test by using invisible light, a display device for displaying the measuring target image as a visible image, a focussing state of the measuring target image being made changeable simultaneous with change of a focussing state of the chart image for test.

Eye refractive power measuring apparatus

There is disclosed an automatic eye refractive power measuring apparatus for automatically measuring refractive power of an eye under test by means of objective measurement. It comprises a projection system for projecting a measuring target image to a retina of the eye under test by invisible light; an imaging optical system for imaging a reflection image of the measuring target image projected to the retina and reflected by the retina; an opto-electric detector having a photosensitive surface disposed at imaging position and adapted to output electrical signal corresponding to the measuring target image formed on the photosensitive surface; display device for displaying the measuring target image reflected on the retina based on the electrical signal as a visible image; and an auto-measuring portion adapted to detect focussing state of the measuring target image projected to the retina based on the electrical signal and automatically calculated refractive power of the eye under test from the electrical signal.

Automatic eye refractive power measuring apparatus

An improved eye refractive power measuring apparatus is disclosed. The apparatus includes a measurement system for projecting a measurement target image to the retina of an eye to be tested and measuring the refractivity of the eye to be tested by detecting the focussing state of the measuring target image. In addition, it has an eye position detection system for detecting a shifted amount from a proper position of the eye to be tested and an arrangement for correcting a measurement result of the eye refractivity based on such detected result.

An eyefundus camera including an observing and photographing optical system having a focusing lens, a mark projecting optical system for projecting a plurality of mark images on patient's eyefundus. The mark projecting optical system is interconnected with the focusing lens of the observing and photographing optical system. There is provided a focusing signal detecting device including a photoelectric device for photoelectrically scanning the mark images projected on the fundus of the patient's eye to produce mark image signals, a horizontal synchronizing signal counting circuit for counting horizontal synchronizing signals for the photoelectric means, a mark image counting circuit for counting number of the mark image signals to determine that a predetermined number of mark image signals exist in a single scanning line, an operation circuit responsive to outputs of the two circuits for determining a horizontal scanning line which is used for judgement of focus conditions.

Ophthalmic instrument having a focus detecting system

Exposure control system for ophthalmic photographing apparatus including a focusing mark projecting optical system for projecting focusing mark on a patient's eye so that the focusing condition can be clearly recognized. A detector is provided for detecting the intensity of the light from the mark image. The signal from the detector is used to control the exposure control system by for example determining the time in which the photographing light source is energized.

Exposure control system for ophthalmic photographing apparatus

An eye refractometer comprising a measuring target projection optical system for projecting a measuring target image to the eye fundus of a patient's eye by means of a pair of beams of light from a measuring target; a rotating device for rotating the pair of beams of light around the optical axis; a measuring target image-forming optical system for forming a target image of the beams of light projected through the measuring target image projected to the eye fundus; a detection device for two-dimensionally detecting the position of the target image formed by the image-forming optical system on a plane perpendicular to the optical axis; and an operating circuit for obtaining a refractive power of the eye along a radial line passing through the centers of the pair of beams of light by means of the signal from the detection device.

Growing community of inventors

Tokyo, Japan

Kiwami Horiguchi