Nidek Co., Ltd.

Yoshiaki Mimura

Naoki Isogai

Masanao Fujieda

Naoto Honda

Mikio Kurachi

Naoki Ichikawa

Hirohisa Terabe

Nobuyuki Yano

Masayuki Yoshino

Akira Tawada

Masamichi Suzuki

Tomohito Ishikawa

A fundus photographing apparatus comprises: an anterior-segment observation optical system arranged to image an anterior-segment illuminated with infrared light to obtain an anterior-segment image; a fundus photographing optical system arranged to image a fundus illuminated with visible light emitted from a light source to obtain a fundus image; a display controller arranged to selectively display the fundus image and the anterior-segment image on a monitor; a photographing switch for inputting a photographing start signal to start photographing using the fundus photographing optical system; and a time informing part arranged to inform an elapsed time after the photographing start signal is input with the photographing switch or an elapsed time after the visible light is emitted from the light source, wherein the display controller displays the elapsed time informed by the time informing part together with the anterior-segment image on the monitor.

Fundus photographing apparatus

A fundus camera favorably performing focusing on a fundus of an examinee's eye without a black dot plate in a target projection optical system comprises an illumination optical system comprising a light source and an objective lens, a photographing optical system comprising a focusing lens movable in the optical axis direction and a diopter correction lens to correct a diopter of severe ametropia, a first moving mechanism comprising a first driving unit moving the focusing lens, a focus detection optical system comprising a projection optical system comprising a light source and a photo-receiving optical system comprising a photodetector, a second moving mechanism comprising a second driving unit moving a part of the detection optical system including at least one of the projection light source and the photodetector in the optical axis direction, a monitor, and a control unit controlling the second unit in conjunction with movement of the focusing lens.

Fundus camera

An electric joystick mechanism for an ophthalmic apparatus which is capable of improving manipulation performance of a joystick and is simple in structure comprises a base, a joystick having a shaft, a driving unit having a motor for moving an ophthalmic examination unit horizontally, and a control unit for controlling the driving unit in response to tilting manipulation of the joystick by an examiner, wherein the control unit performs first control of finely moving the examination unit by controlling the driving unit based on a manipulation signal of the joystick, and second control of roughly moving the examination unit by controlling the driving unit when tilting condition of the joystick becomes a predetermined tilting condition, and in the second control, velocity of driving of the driving unit is controlled based on velocity of the tilting manipulation of the joystick in the first control.

Electric joystick mechanism for an ophthalmic apparatus

To provide an ophthalmic apparatus by which an examiner can provide assistance such as lifting an examinee's eyelid while easily observing an observation image of an examinee's eye displayed on a monitor. The ophthalmic apparatus has a measurement part including a measurement optical system for examining or measuring the examinee's eye, a fixed support part which supports the measurement part to be movable, an observation optical system provided in the measurement part and having an image-pickup element, for observing an anterior segment of the eye, a monitor which displays an image of the anterior segment picked up by the element, and a holding unit which holds the monitor to be movable with respect to the measurement part or the fixed support part to change a placement position of the monitor between a first position where its screen is approximately vertical and a second position where the screen is approximately horizontal.

Ophthalmic apparatus

An apparatus that includes an intraocular pressure measurement part having a blowing unit, an optical characteristics measurement part, a main body having the above measurement parts, a measurement part shifting unit bringing one of the measurement parts to a measurable state, a working distance detecting unit having a projection optical system and a photo-receiving optical system, a control part judging whether to continue shifting the intraocular pressure measurement part to the measurable state based on a detection result and controlling the shifting unit based on a judgment result, and a detection unit directly or indirectly detecting whether light photo-received on the photo-receiving optical system is target light reflected from a cornea, wherein when the light is not the target light, the control part judges it proper to continue shifting and controls the shifting unit.

An ophthalmic apparatus capable of performing smooth examination. The apparatus includes a chin rest on which a chin of an examinee is placed, a chin rest moving unit which puts the chin rest into up/down movement, an examination unit which has an examination optical system for examining an eye of the examinee, a first moving unit which puts the examination unit into up/down movement with respect to the eye, an alignment condition detection unit which detects an alignment condition of the examination unit with respect to the eye, and a control unit which drives and controls the chin rest moving unit based on at least any one of a possible range of the up/down movement and a limit position of the up/down movement of the examination unit as well as a detection result obtained by the alignment condition detection unit.

A multifunction ophthalmic apparatus, capable of efficiently measuring and examining eye characteristics respectively, has an measurement part including a unit blowing fluid to a cornea via a nozzle for measuring intraocular pressure of an examinee's eye, a reflection member having a reflection surface, arranged insertably and removably between the eye and the nozzle, an examination part storing an optical system, which photo-receives reflection light from the eye reflected by the member for examination, a main body storing the parts, a first unit moving the body relative to the eye in working distance direction, a second unit moving the measurement part relative to the body in the direction, a third moving unit inserting and removing the member, a device for emitting a switching signal between a first mode for examination and a second mode for measurement, and a unit controlling driving of the second and third moving units on the signal.

An ophthalmic apparatus for measuring an eye of an examinee, includes a device for detecting whether the eye is located within a predetermined area with respect to the apparatus, an interval time producing device for producing a prescribed interval time, a power supply device for supplying power intermittently to the detecting device in accordance with signals for the interval time producing device, and power supply signal generating device for generating a signal to supply a power required by the ophthalmic apparatus when the detecting device judges that the eye exists within the predetermined area.

Opthalmic apparatus having lowered consumption of electric power

An ophthalmic apparatus for use by an examiner in examining an examinee's eye includes an optical system for examining the examinee's eye, an observing optical path for observing the examinee's eye directly in binocular vision, a beam splitter disposed in the observing optical path, and a mark forming device for forming an aiming mark at a position conjugate to a predetermined portion of the anterior part of the eye, the light of the aiming mark being reflected by the light splitting member into the eyes of the examiner, wherein the positional relationship along the observing optical path between the anterior part of the examinee's eye and the aiming mark is perceived through the examiner's eyes and the suitability of the working distance of the apparatus can be judged.

Ophthalmic apparatus with positioning control

An ophthalmic apparatus is provided with a measurement unit that includes a measurement device that projects measurement light onto an examinee's eye and detects the measurement light reflected by the examinee's eye, a grip that supports the measurement device, so that the examiner can hold the device in his hand, a wireless transmitting device that transmits data about the examinee's eye to a receiving device separate from the measurement unit, the data being obtained based on light detected by the measurement device, and a signal generating device that generates a start signal to make the transmitting device start to transmit; the receiving device receives the transmitted data about the examinee's eye and has a holding device that detachably holds the measurement unit for transmission of measurement data.

Ophthalmic apparatus including hand-held measuring device and wireless

An examination apparatus for examining an object having a spheroidal reflecting surface provides a first index projecting optical system for projecting a first measuring index onto the object to be examined at a designated angle, a second index projecting optical system for projecting a second measuring index having a different optical distance from the first index onto the object at the designated angle, so that each reflected images of the first and second measuring index have a designated image height relationship therebetween when the object is placed at a designated working distance, and respective image height of reflected images of the first and second measuring index are detected by a detecting optical system with a photoelectric conversion apparatus, whereby whether the working distance between the object and the apparatus is right or not is judged by processing a signal detected by the photoelectric conversion apparatus.

Examination apparatus for examining an object having a spheroidal

A joy stick mechanism for an ophthalmic apparatus moving an optical device of the ophthalmic apparatus horizontally and vertically, which mechanism is simple in structure but excellent in operational efficiency. Therefore, this mechanism comprises a drive device for moving the optical device vertically, a rotating knob rotatably provided on a shaft which substantially extends through a central portion of the mechanism, a detection device for detecting a direction and an amount of rotation of the rotating knob, and a control device for controlling the drive device on the basis of detection results of the detection device.

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Gamagori, Japan

Yoshiaki Mimura