JPH0228884Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an ophthalmological examination device that performs color imaging or fluorescent contrast imaging of an intraocular chamber or fundus image of an eye to be examined.

[Prior Art] Conventionally, in such ophthalmological examination apparatuses, color photography has been performed for general examinations.
In this case, the light source for observation illumination is adjusted to an arbitrary brightness using a volume for observation and photography.

Contrast imaging using a fluorescent agent has also been conventionally used to examine fine particles in the eye chamber or the condition of the fundus of the eye. In this case, an exciter filter is inserted into the observation illumination optical system, fluorescens solution is injected into the subject, and when florescens appears on the fundus of the eye, a barrier filter is injected into the optical system and images are taken.

[Problems to be Solved by the Invention] When performing fluorescent contrast imaging in such a conventional apparatus, an exciter filter is inserted into the observation illumination system, so the amount of observation light becomes small and dark. Therefore, in the past, the light intensity was fixed at a bright light level, or the light intensity was adjusted using a volume different from the volume used for color photography, which required numerous operations and required darkroom work. This has been a problem when photographing the fundus.

Therefore, the present invention has been made in order to eliminate such conventional drawbacks, and provides an ophthalmological examination device that can obtain an optimal amount of light in color photography and fluorescent agent contrast photography, and has improved operability. The purpose is to

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides an ophthalmological examination device that takes color or fluorescent contrast imaging of the chamber or fundus of the eye to be examined. An illumination light source for observation illumination, a dimming means for controlling the illumination light source, an illumination optical system that guides the luminous flux from the illumination light source to the eye to be examined, and a filter inserted into the illumination optical system during fluorescent agent contrast imaging. and an adjusting means for adjusting the brightness of the illumination light source according to the insertion of the filter into the illumination optical system, and the adjusting means adjusts the brightness of the illumination light source for color photography and fluorescent agent contrast photography, respectively. A configuration was adopted in which the illumination light source was adjusted to be appropriate, and the light source for illumination could be controlled by the light control means at each photographing time.

[Function] With this configuration, even if an exciter filter is inserted during fluorescent agent contrast imaging, the illumination light source can be automatically adjusted to the appropriate light intensity,
Furthermore, it is also possible to control the light using the light control means used during color photography.

[Example] Hereinafter, details of the present invention will be explained based on an example shown in the drawings.

FIG. 1 shows the configuration of an optical system of an ophthalmological examination apparatus according to the present invention, and in the figure, reference numeral 1 indicates the eye to be examined. With the optical axis directly facing this eye to be examined,
A main optical system indicated by 7 is arranged. Among these, reference numeral 2 is an objective lens, and reference numeral 8 is an obliquely arranged perforated mirror.

The perforated mirror 8 is used to project illumination light from an illumination optical system for observation and photographing, indicated by reference numerals 9 to 18, as a ring-shaped illumination light around the iris of the eye to be examined. The illumination optical system is composed of, from the main optical system side, a relay lens 9, a conjugate focal glass 10, a condenser lens 11, and a ring slit 12 for forming ring light.

The light source for illumination for observation is composed of a lamp 18, and the light source for photography is composed of a flash tube 16, and these illumination lights are passed through a condensing lens 17 or 15 to an optical path switching mirror 14 for selecting the light source.
is incident on the An exciter filter 13 is provided between the optical path switching mirror 14 and the ring slit 12.
is provided and inserted into the optical path of the illumination system during fluorescent contrast imaging. This exciter filter 1
3, a switch SW2, which will be described later, is activated. Further, the light amount of the illumination light source 18 can be adjusted by a volume VR1 provided on the panel.

On the other hand, behind the perforated mirror 8, a diaphragm 3, an eye diopter correction lens 4, a focusing lens 5, and imaging lenses 6, 6' are provided. The imaging lens 6 is
In the case of color photography, the angle of view is set to 45 degrees, and the angle of view of the imaging lens 6' is set to 30 degrees.When switching the angle of view, one of the imaging lenses is inserted into the optical path and the angle of view is set to 30 degrees. The switch SW1 is changed over.

Further, behind the imaging lens 6, a film 7 for photographing is arranged. An image to be formed on the film 7 is taken out by an obliquely disposed reflecting mirror 19 and a half mirror 20, and can be observed through an eyepiece lens 21. Further, a barrier filter 24 is provided between the diopter correction lens 4 and the focusing lens 5, which is automatically inserted during fluorescent contrast imaging.

FIG. 2 shows a circuit that adjusts the amount of light from the illumination light source 18, and the circuit that adjusts the amount of light from the illumination light source 18.
SW1 is a resistor R1 and an inverter when the angle of view is 45°.
A circuit consisting of IN1, resistor R4, analog switch A4, resistor R8, and volume VR3, or in the case of a 30° angle of view, a circuit consisting of resistor R2, inverter IN2, resistor R5, analog switch A5, resistor R7, and volume VR2. connected to form a resistance value depending on the angle of view. The angle of view of VR2 and VR3 is
In the case of 30° and 45°, the illumination light is set to be maximum.

On the other hand, switch SW2 is connected to resistor R3 and inverter.
It is connected to the circuit from IN3, resistor R6, analog switch A6, and resistor R11, and forms a resistance value according to the optical path insertion of exciter filter 13.

Further, the volume VR1 provided on the panel for dimming the illumination light source 18 is set to its maximum (MAX).
The sides are connected to VR2 and VR3, the minimum (MIN) side is connected to the collector of the transistor TR1, and the tap thereof is connected to the control voltage terminal Vout of the light source via a resistor R12. Resistance R9, R
In the configuration of 10, transistor TR1, and volume VR4, volume VR4 is set so that the amount of light is minimized.

Next, the operation of the device configured in this way will be explained. When shooting in color and the angle of view is 45°, the switch
SW1 is connected to the 45° terminal. As a result, the output of the inverter IN1 becomes high level, the analog switch A4 becomes conductive, and the voltage of Vcc is applied to the resistor R8. Since the exciter filter 13 is not inserted, SW2 is off and analog switch A6 is off. Therefore, by rotating the volume VR1,
The voltage output to the terminal Vout varies from Vmax to Vmin, and the light source 18 is dimmed accordingly.

When the exciter filter 13 is inserted for fluorescent contrast imaging, the switch SW2 is turned on, the output of the inverter IN3 becomes high level, and the analog switch A6 is turned on. Therefore, the resistance between A and B is the resistance value of the parallel circuit of the resistor (VR1 + R12) and the resistor R11. The amount of illumination is adjusted to the appropriate level. The amount of illumination can also be adjusted by rotating VR1 in the same way.

When the angle of view is 30° and the imaging lens 6' is inserted into the optical path, switch SW1 is switched to the 30° terminal, resistors R1, R5, R7, and volume VR
Resistance value 2 becomes effective and the amount of light is adjusted to a value suitable for a 30° angle of view, and the rest is the same as in the case of a 45° angle of view.

[Effect] As explained above, according to the present invention, the first light source is connected in series to the dimming volume connected to the illumination light source.
and a second resistor, and the value of the first resistor is changed depending on whether it is color photography or fluorescent agent contrast photography, and the value of the second resistor is changed depending on whether a lens with a different angle of view is inserted.
and adjust the change in the current flowing through the illumination light source by changing the value of the first and second resistors by changing the dimming volume to dim the illumination light source. Because it is
Even if a filter is inserted during fluorescent contrast imaging, or a lens with a different angle of view is used during color imaging, the current flowing through the illumination light source will automatically change accordingly, and the dimming volume will ultimately be adjusted. With this simple configuration, the illumination light source can be dimmed, making it possible to achieve optimal dimming for various inspection modes.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the configuration of an optical system of an ophthalmological examination apparatus according to the present invention, and FIG. 2 is a circuit diagram showing the configuration of a dimming circuit of the apparatus shown in FIG. 1... Eye to be examined, 6, 6'... Imaging lens, 7...
...Film, 13...Exciter filter, 1
6... Flash tube, 18... Light source for illumination.

Claims (1)

[Scope of Claim for Utility Model Registration] In an ophthalmological examination device that takes color or fluorescent contrast imaging of an eye chamber or fundus image of an eye to be examined, an illumination light source for illuminating the eye to be examined for observation, and a dimming control connected to the illumination light source a first and second volume connected in series to the volume;
an illumination optical system that guides the light flux from the illumination light source to the eye to be examined; a filter that is inserted into the illumination optical system during fluorescent agent contrast imaging and removed from the illumination optical system during color imaging; and insertion and removal of the filter. means for changing the value of the first resistor accordingly; two lenses with different angles of view disposed in the photographing optical system during color photography; and means for changing the value of the second resistor depending on whether the color imaging or fluorescent contrast imaging is performed, and the value of the first resistor depending on whether the lens having a different angle of view is inserted. and changing the value of the second resistor, and adjusting the change in the current flowing through the illumination light source by changing the value of the first and second resistors by changing the dimming volume, thereby adjusting the illumination light source. An ophthalmological examination device that emits light.