摘要:
The present invention relates to an optical instrument for examining the eye fundus which is so designed that in the optical system including an objective lens visible, targets are built for orientating the visual line of the eye to be inspected along the direction convenient for the inspection of the desired part of the eye fundus in order to be able to inspect the desired part. The visible targets are located at the position conjugate to the eye fundus with regard to the optical system including the objective lens in order that the light beam coming from the targets through the objective lens reaches the eye to be inspected. The image of the visible targets is formed on the eye fundus of the eye to be inspected while the eye to be inspected observes the visible targets through the objective lens in such a manner that the visual line is oriented in the direction along which the targets are seen.
摘要:
An eye examining instrument comprises an ultrasonic wave generating source, reflecting members and a receiver. A concave reflecting mirror is provided to direct the generated ultrasonic waves in the direction along the optical axis of the objective lens of the instrument while converging the waves. Also, a concave reflecting mirror is provided to converge the ultrasonic waves reflected upon the cornea of the eye under test and examination into the receiver. The ultrasonic waves received by the receiver are transformed into an electric signal. The electric signal thus produced includes a component informing of the time required to receive the ultrasonic waves after the generation thereof and a component informing of the intensity of the received ultrasonic waves. The time component signal is compared with a reference signal representative of a predetermined working distance between the objective lens and the eye whereas the intensity component signal is compared with a reference signal representative of the alignment of the objective lens with the eye.
摘要:
In an eye fundus camera an optical system illuminates the eye fundus and a sensor detects the intensity of reflection from the eye. When the intensity of reflection is sufficient to indicate that the person being examined has blinked his eye, the photographic system is disabled.
摘要:
A medical television system includes a television camera and a selector. The television camera includes a filter for separating visible light into three wavelength regions and transmitting near-infrared rays, and an image pickup element having sensitivity to both visible light and near-infrared rays. The selector selectively supplies the visible light separated into the three wavelength components or the near-infrared rays to the television camera.
摘要:
An eye fundus camera is provided with an illuminating system for illuminating an eye to be examined, a photographing system for photographing the fundus of the eye to be examined, eye fundus reflected light receiving portions disposed in a plane substantially conjugate with the fundus of the eye to be examined and at a plurality of locations with a spacing greater than the dimension corresponding to the nipple diameter, and a control unit for operation-processing the outputs of the eye fundus reflected light receiving portions and automatically controlling the quantity of photo-taking light.
摘要:
Disclosed is an ophthalmic instrument provided with an illuminating system for illuminating an eye being examined, an imaging system for imaging a predetermined portion of the eye being examined at a predetermined image plane position, and a detecting system for detecting any variation in the reflected light from the front-eye-part of the eye being examined by a nictitation of the eye being examined without depending on the quantity of illuminating light of the illuminating system.
摘要:
A photographing device is provided with a pair of support members positioned in mutually opposed manner across a film, a sensitivity increasing screen mounted on at least one of the paired support members, a sealing member for hermetically sealing a space containing the film and the sensitivity increasing screen, a vacuum pump for reducing the pressure in the sealed space to maintain the film and the sensitivity increasing screen in mutual close contact, and a support member for maintaining the film in a predetermined position between the support member in the sealed space. Thus the sensitizing screen can be securely contacted with the film, and errors in operation are reduced even when the photographing operation is conducted with the film in vertical or inclined position.
摘要:
An X-ray phototaking apparatus for effecting an X-ray phototaking operation on a sheet film, selected from plural kinds of sheet film in close contact, under a reduced pressure, with an intensifying member selected from of plural kinds of intensifying members, is provided with a device for detecting at least either the kind of the intensifying member and the kind of the sheet film, and a device for varying at least one of the contact time of the intensifying member and the sheet film, the X-ray irradiating conditions and the exposure control parameters, based on detection signals obtained from the detection.
摘要:
An apparatus capable of simply and accurately measuring cornea refractive power and eye axis length at least necessary to select a proper in-the-eye lens for an eye to be examined without moving a slidable bed in a horizontal plane.
摘要:
A sheet extracting mechanism is provided with a suction cup for attracting one of stacked sheets, a negative pressure source for supplying a suction force to the suction cup, a detector for detecting the pressure in the suction cup, a moving mechanism for moving the suction cup thereby extracting the sheet adhered to the suction cup by the section force, and a discriminator for comparing the suction force in the suction cup with a predetermined pressure, at a predetermined position located a predetermined distance from the bottom of the stack of sheets, thereby identifying the amount of the stacked sheets. The suction cup is temporarily stopped at the predetermined position corresponding to a predetermined number of remaining sheets, and the remaining number of sheets is identified equal to or less than the predetermined number when the suction cup no longer touches the sheet, thereby becoming unable to attract the sheet.