JPH0529683Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[0001]

[Industrial Field of Application] The present invention relates to an ophthalmological examination device for color photographing or fluorescent contrast photographing of an intraocular chamber or fundus image of an eye to be examined.

【0002】

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

[0003] Contrast imaging using a fluorescent agent has also been conventionally used to examine fine particles in the eye chamber or the state 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, a barrier filter is injected into the optical system and images are taken. .

[0004]

[Problems to be Solved by the Invention] In such a conventional apparatus, when fluorescent agent contrast imaging is performed, 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 made darkroom work difficult. This has been a problem when performing fundus photography with .

[0005] Therefore, the present invention was made in order to eliminate such conventional drawbacks, and it is possible to obtain an optimal amount of light in color photography and fluorescent contrast photography, and to make appropriate adjustments according to the examination mode. The purpose of the present invention is to provide an ophthalmological examination device that can automatically set the light range and has good operability.

[0006]

[Means for Solving the Problems] In order to solve the above problems, in the present invention, the eye to be examined is illuminated for observation in an ophthalmological examination apparatus that takes color or fluorescent contrast images of the chamber or fundus of the eye to be examined. an illumination light source that guides the light flux from the illumination light source to the subject's eye, a dimming volume connected to the illumination light source, and a plurality of resistive elements, each of which has one end connected to the dimming light source. a resistor circuit which is connected to each of the dimming volumes and acts as an attenuator for deriving a dimming output voltage from the other commonly connected end, and also acts as an operation sensitivity adjustment means for the dimming volume; When the filter is inserted into the illumination optical system and removed from the illumination optical system during color photography, the attenuation amount of the resistor circuit and the adjustment are controlled by switching the resistor elements of the resistor circuit as the filter is inserted and removed. and a means for switching the amount of adjustment of the operating sensitivity of the light volume, and the resistor circuit is switched depending on whether the color imaging or fluorescent agent contrast imaging is performed, thereby dimming the illumination light source and adjusting the dimming volume. We adopted a configuration that adjusts the operating sensitivity.

[0007]

[Function] With this configuration, the illumination light source can be automatically adjusted to the appropriate light intensity for normal color imaging, fluorescent contrast imaging, and when an exciter filter is inserted. At the same time, the dimming operation sensitivity of the dimming volume can be appropriately controlled.

[0008]

Embodiments The present invention will be described in detail below based on embodiments shown in the drawings.

[0009] 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 the eye to be examined,
Main optical systems designated by numbers 2 to 7 are arranged. Among these, reference numeral 2 is an objective lens, and reference numeral 8 is an obliquely arranged perforated mirror.

[0010] The perforated mirror 8 is for projecting the illumination light from the illumination optical system for observation and photographing, indicated by reference numerals 9 to 18, around the iris of the eye to be examined as ring-shaped illumination light. It is. 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.

[0011] The light source for illumination for observation is the lamp 1.
8. The light source for photographing is composed of a flash converter 16, and these illumination lights are inputted via a condenser lens 17 or 15 to an optical path switching mirror 14 for selecting a light source. An exciter filter 13 is provided between the optical path switching mirror 14 and the ring slit 12, and is inserted into the optical path of the illumination system during fluorescent contrast imaging. When inserting this exciter filter 13, the switch described later is activated.
SW2 is activated. Further, the light amount of the illumination light source 18 can be adjusted by a volume VR1 provided on the panel.

[0012] On the other hand, behind the perforated mirror 8, there is an aperture 3, a subject eye diopter correction lens 4, a focusing lens 5,
Imaging lenses 6, 6' are provided. For color photography, the imaging lens 6 has an angle of view of 45°, and the imaging lens 6' has an angle of view of 30°.When switching the angle of view, either imaging lens is set in the optical path. is inserted, and the switch SW1 is switched accordingly.

[0013] Further, behind the imaging lens 6, a film 7 for photographing is arranged. Filter 7
The image to be formed is taken out by an obliquely arranged reflection mirror 19 and a half mirror 20,
It is arranged so that it 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.

[0014] FIG. 2 shows a circuit that adjusts the light intensity of the illumination light source 18, and the above-mentioned view angle switch SW1 is connected to the resistor R1, inverter IN1, resistor R4, and analog switch when the view angle is 45°. A4, resistance
The circuit consisting of R8, volume VR3, and angle of view
For 30°, resistor R2, inverter IN2, resistor
R5, analog switch A5, resistor R7, volume
It is connected to a circuit consisting of VR2 and forms a resistance value depending on the angle of view. VR2 and VR3 are set so that the illumination light is maximized when the angle of view is 30° and 40°.

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

[0016] Also, as shown in the figure, the volume VR1 provided on the panel for dimming the illumination light source 18 has its maximum (MAX) side connected to VR2 and VR3, and its minimum (MIN) side connected to the collector of the transistor TR1. , furthermore, the output of the slider terminal is resistor R
12, it is output to a dimming driver (not shown) as a control voltage Vout that adjusts the amount of light from the light source.

[0017] In the circuit configuration shown in FIG. 2, resistors R9 and R10, transistor TR1, and
The VR4 configuration is for setting the minimum output Vmin of the dimming volume.
By adjusting VR4, you can determine the minimum amount of dimming.

Furthermore, in the circuit configuration shown in FIG. 2, the resistors R11 and R12 are controlled via the analog switch A6 so that only the resistor R12 or both R11 and R12 are connected between A and B. When analog switch A6 is turned on, the voltage at point A is
When Vcφ and the slider output of volume VR1 are Vc, the dimming output Vout is Vout=Vc+(Vc0−Vc)・R12/(R11+R12)
(1) Therefore, Vout=Vc・R11/(R11+R12)+R12/(R11+
R12) (2) In equation (2), resistors R11 and R12 are analog switch A6
This shows that it functions as a means to adjust the operating sensitivity of the volume VR1 according to the state of the volume VR1.
That is, for ease of explanation, the output voltage
Assuming that the input impedance of the voltage-controlled dimming driver that inputs Vout is so large that resistor R12 can be ignored, if analog switch A6 is non-conductive, Vout=Vc (3). Considering that there is a unique relationship between Vc and the manipulated variable of volume VR1, selecting either equation (2) or (3) by turning analog switch A6 ON/OFF means that This is equivalent to selecting the degree of influence of the operation amount on the dimming output Vout, that is, the operation sensitivity.

[0019] Also, the output Vc of the volume VR1 is Vc
= Vmin ~ Vc = Vmax (= Vc0) (Vmax and Vmin are determined by the selection of switch SW1), so if analog switch A6 is ON, the dimming output Vout is Vmin・R12 from equation (2). /(R11+R12)≦Vout≦Vmax (4) If analog switch A6 is OFF, the operating range of Vmin≦Vout≦Vmax (5) is possible, and the analog switch
When the analog switch is ON, that is, when performing fluorescent contrast imaging in which the exciter filter 13 is inserted, the analog switch is OFF, that is, when performing color imaging.
With the same amount of operation of the dimming volume VR1, more subtle changes in the dimming amount can be obtained (in addition, in the above, the input impedance of the dimming driver that inputs the dimming output voltage Vout is assumed to be infinite) However, if the input impedance of the tunable optical driver is small, the term on the right side of Vmax in equation (4) will be a larger value than Vmax in equation (5)).

[0020] Further, assuming that there is a predetermined functional relationship between the operation amount/resistance value of the dimming volume VR1, Vout changes on a curve that changes within the range of equations (4) and (5).

[0021] That is, in the circuit configuration shown in FIG. 2, it can be seen that when the analog switch A6 is turned on, the dimming output Vout is boosted within almost all the dimming range of the dimming volume VR1.

[0022] It should be noted here that in the circuit configuration shown in FIG. 2, in the control linked to the ON/OFF of the exciter filter 13, the dimming voltage output range becomes high (the amount of light is increased). Moderately,
The point is that it is possible to obtain more subtle changes in the amount of dimming with the same amount of operation of the dimming volume VR1. As will be described later, the relationship between the dimming amount range and the operating sensitivity of the dimming volume VR1 is opposite to the control that is linked according to the angle of view via the switch SW1.

[0023] Next, the operation of the apparatus configured as illustrated will be explained. When shooting in color and the angle of view is 45°,
Switch SW1 is connected to the 45° terminal. As a result, the output of inverter IN1 becomes high level, analog switch A4 becomes conductive, and resistor R8 becomes conductive.
A voltage of Vcc is applied.

[0024] When the exciter filter 13 is not inserted, the switch SW2 is turned off,
Analog switch A6 is turned off. Therefore, in this case, by rotating the dimming volume VR1, the voltage output to the terminal Vout will be Vmax
to Vmin, and the light source 18 is dimmed accordingly.

[0025] Here, when the exciter filter 13 is inserted for fluorescence contrast imaging, the switch
SW2 turns on, the output of inverter IN3 becomes high level, and analog switch A6 turns on. Therefore, both resistors R11 and R12 are inserted between A and B, and the output voltage Vout is as shown in equation (1). Therefore, when performing fluorescent contrast imaging, the light intensity of the light source 18 is increased, the light source 18 is dimmed to an appropriate light intensity suitable for this increase, and the operating sensitivity of the dimming volume VR1 is changed as described above. , it becomes possible to perform more delicate dimming with the same amount of operation.

[0026] Furthermore, when the angle of view is 30°, the imaging lens 6' is inserted into the optical path, and in conjunction with this, the switch SW1 is switched to the 30° terminal. This allows resistors R1, R5, R7, and volume VR2
The resistance value will be enabled and the light intensity will be adjusted to suit the 30° viewing angle.

[0027] When switching the angle of view, the resistance value in series with the dimming volume VR1 is switched depending on the lens selection.

[0028] At this time, the operation sensitivity of the dimming volume VR1 is also changed according to the lens selection, but in that case, as the dimming output voltage becomes in a higher range, the amount of voltage change for the same operation amount changes. becomes larger.

[0029] This control is opposite to the switching of the operating sensitivity of the dimming volume VR1 in response to the insertion of the exciter filter 13 described above. When the amount of light is increased in accordance with the insertion of the exciter filter 13, the operation sensitivity is switched so that the amount of voltage change for the same amount of operation becomes smaller.
That is, during fluorescence contrast imaging in which the exciter filter 13 is inserted, more delicate light control operations are possible.

【0030】

[Effects of the invention] As is clear from the above, according to the present invention, in an ophthalmological examination apparatus that takes color images or fluorescent contrast images of the chamber or fundus of the eye to be examined, the illumination light source for illuminating the eye to be examined for observation and ,
An illumination optical system that guides a luminous flux from an illumination light source to the subject's eye, a dimming volume connected to the illumination light source, and a plurality of resistive elements, each of which has one end connected to the dimming volume. , and a resistor circuit which acts as an attenuator for deriving a dimming output voltage from the other commonly connected end and also acts as an operation sensitivity adjustment means for the dimming volume, and a resistor circuit which is connected to the illumination optical system during fluorescence contrast imaging. A filter is inserted and removed from the illumination optical system during color photography, and the amount of attenuation of the resistor circuit and the operation sensitivity of the dimming volume are controlled by switching the resistor elements of the resistor circuit as the filter is inserted and removed. means for switching the adjustment amount, and the resistance circuit is switched depending on whether the color imaging or the fluorescent contrast imaging is performed, thereby dimming the illumination light source and adjusting the operating sensitivity of the dimming volume. This configuration allows the illumination light source to be automatically adjusted to the appropriate light intensity for normal color imaging, fluorescent contrast imaging, and when an exciter filter is inserted. , an excellent ophthalmological examination device that can appropriately control the dimming operation sensitivity of the dimming volume and automatically control the light intensity of the illumination light source and the dimming operation sensitivity of the dimming volume according to the examination mode. Can be provided.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an optical system of an ophthalmological examination apparatus according to the present invention.

FIG. 2 is a circuit diagram of a dimming circuit of an ophthalmological examination apparatus according to the present invention.

[Explanation of symbols]

1... Eye to be examined 2...Objective lens 3...Aperture 4... Eye diopter correction lens to be examined 5…Focusing lens 6...Imaging lens 7...Film 8...Diagonal perforated mirror 9...Relay lens 10...Conjugate focusing glass 11...Condenser lens 12...Ring slit 13...Exciter filter 14...Optical path switching mirror 15... Focusing lens 16...Flash tube 17...Condensing lens 18...Light source for illumination 19... Oblique reflective mirror 20...Half mirror 21...Eyepiece 24...Barrier filter.

Claims (2)

[Scope of utility model registration request] Claim 1: An ophthalmological examination device that takes color or fluorescent contrast imaging of an eye chamber or fundus image of an eye to be examined, comprising: an illumination light source that illuminates the eye to be examined for observation; and an illumination device that guides the light flux from the illumination light source to the eye to be examined. It consists of an optical system, a dimming volume connected to an illumination light source, and a plurality of resistive elements, each of which has one end connected to the dimming volume, and
a resistor circuit which acts as an attenuator for deriving a dimming output voltage from the other commonly connected end and also acts as an operation sensitivity adjustment means for the dimming volume; inserted into the illumination optical system during fluorescence contrast imaging; A filter is detached from the illumination optical system during color photography, and the amount of attenuation of the resistor circuit and the amount of adjustment of the operating sensitivity of the dimming volume are controlled by switching the resistor elements of the resistor circuit as the filter is inserted and removed. and switching means for switching the resistor circuit depending on whether the color imaging or fluorescent contrast imaging is performed, thereby dimming the illumination light source and adjusting the operating sensitivity of the dimming volume. An ophthalmological examination device. 2. The adjustment of the operating sensitivity of the dimming volume is adjusted such that the larger the light amount of the illumination light source is, the more the control sensitivity of the dimming volume increases.
2. The ophthalmological examination apparatus according to claim 1, wherein the ophthalmological examination apparatus is operated so as to obtain more subtle changes in the amount of light adjustment with the same amount of operation.