JPS6251619B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ophthalmological photographing apparatus capable of performing fluorescent ophthalmological photographing.

Fluorescent fundus photography, which is known as a type of ophthalmologic imaging, illuminates the fundus with blue excitation light, timing the time when a fluorescent agent injected through the cubital vein reaches the intraocular circulation system, and then detects blood vessels. This is done by photographing the green-yellow fluorescence emitted by the fluorescent agent inside. It takes about 10 seconds for the fluorescent agent to appear in the eye.
At that time, an exciter filter with wavelength versus light transmittance characteristics as shown in A in Figure 1 is inserted into the illumination optical path, and a barrier filter with characteristics as shown in B in Figure 1 is inserted in the photographing optical path. It is necessary to. However, when both the exciter filter and the barrier filter are inserted, almost nothing can be visually recognized in the fundus image seen through the window until fluorescence begins to appear.

Therefore, do not insert the exciter and/or barrier filter into the optical path until just before the fluorescent image appears, and align the fundus camera with the fundus of the eye to be examined.
After focusing, both filters or a barrier filter are inserted into the fluorescent light just before the fluorescent image appears, and the photograph is taken. After a fluorescent image appears, a common method of photographing is to keep both filters inserted in the optical path in order to observe and diagnose the fluorescent image while taking the image.

Conventionally, when observing with only the exciter in the optical path, the examiner manually inserts and removes the barrier filter by inserting and removing the filter frame on the side of the fundus camera, which causes the fundus camera to move when the filter is inserted. Problems include not being able to take good photographs due to misalignment, or when the barrier filter is removed and repositioned, a fluorescent image appears and it becomes impossible to capture the initial image of the fluorescent light. It was hot.

The purpose of the present invention is to provide an ophthalmology clinic in which the above-mentioned troublesome operations that must be performed in a short time can be easily and reliably performed, and good fluorescent fundus photographs can be obtained without misalignment. The objective is to provide photographic equipment.

The present invention will be explained in detail based on the embodiments shown in FIG. 2 and below.

FIG. 2 is a configuration diagram showing an example of the optical system of an ophthalmological camera, and 1 is an observation light source consisting of a tungsten lamp, etc.
The light emitted from the is incident on the mirror 4 via the condenser lens 2a, the photographing light source 3 consisting of a xenon discharge tube, etc., and the condenser lens 2b, where it is deflected and sequentially transmitted to the exciter filter 5, the ring slit plate 6, and the relay lens. It reaches the perforated mirror 8 via 7a and 7b. Incidentally, reference numeral 9 denotes a reflecting mirror arranged behind the observation light source 1 to collect and reflect the light from this lamp. The light that enters the perforated mirror 8 from the above-mentioned illumination optical system is reflected by the perforated mirror 8 in the direction of the eye E to be examined, illuminates the fundus Ef of the examined eye E, passes through the original optical path, and then returns to the perforated mirror 8. and reaches the observation optical system. An objective lens 10 is arranged between the perforated mirror 8 and the subject's eye E, and behind the perforated mirror 8, a barrier filter 11, a focusing lens 12, a photographing lens group 13, and a movable lens are arranged along the optical axis. A mirror 14, shutter 15, and photographic film 16 are arranged in sequence. On the reflection side of the movable mirror 14, a field lens 17 placed at a position conjugate with the photographic film 16, a mirror 18 for changing the optical path, and a finder 19 are arranged in sequence along the optical axis. Note that e is the examiner's eye.

Here, the exciter filter 5 is the solenoid 2
1, it is inserted into the illumination optical path during fluorescence photography, and removed from the optical path during other photography. In addition, the barrier filter 11
is inserted into and removed from the photographing optical path by driving a solenoid 20.

This ophthalmological camera has an illumination light source 1 and a photographing light source 3.
is substantially conjugate with respect to the condenser lens 2a, the observation light source 1 is turned on during observation, and the photographing light source 3 is turned on instantaneously during photography. The light source image is once formed in the vicinity of the ring slit plate 6 by another condenser lens 2b, and then the image of the ring-shaped aperture of the ring slit plate 6 is formed in the vicinity of the perforated mirror 8 by the relay lenses 7a and 7b.
Here, the illumination light is reflected and travels to the left. Then, after forming an image of the ring-shaped aperture near the crystalline lens El of the eye E to be examined using the objective lens 10, the fundus Ef is illuminated.

The reflected light from the fundus Ef travels to the right and is once formed into an image by the crystalline lens El and the objective lens 10, then passes through the perforated mirror 8 and the photographic diaphragm (not shown), and is focused by the focusing lens 12 and photographic lens group 13. The image will be focused. During observation, the fundus image is guided upward by the movable mirror 14 located at the solid line position.
The fundus image is observed by the examiner's eye e through the viewfinder 19, and when taking a photograph, the movable mirror 14 rotates to the dotted position, and the fundus image is formed on the photographic film 16 through the opened shutter 15.

3, 4, and 5 are cross-sectional views of a gripping rod 30 used by an examiner to operate an ophthalmological camera, and an operation button 31 is attached to the upper part of the gripping rod 30 so as to be movable up and down. There are three spring contacts below the operation button 31.
A switch S2 consisting of Sa, Sb, and Sc is provided. Figure 3 shows the state in which the operation button 31 is not pressed, Figure 4 shows the 1/2 stroke, and Figure 5 shows the conduction and non-conduction between the spring contacts Sa, Sb, and Sc of the switch S2 when the button is pressed for the full stroke. Indicates a conductive state.

FIG. 6 is a block circuit diagram for controlling the operation of this embodiment, and the same reference numerals as in FIGS. 2 to 5 indicate the same members. 40, 41, and 42 are power supplies for the solenoid 20, observation light source 1, and photographing light source 3, respectively. The switch S2 is located within the aforementioned gripping rod 30, and S1 is a switch operated by a relay 50. Reference numeral 51 denotes a flip-flop circuit which is a drive circuit for the relay 50. When the signal line _L1 is short-circuited with _L2 , it enters a set state and drives the relay 50, and when the power supply 40 is turned off, it is reset and the relay is activated. It operates to stop the drive of 50. S3 is a switch operated by relay 44. In order to light up the observation light source 1, a thyristor 45 and a unidirectional transistor (hereinafter referred to as
A trigger circuit 4 (abbreviated as UJT) 46 is inserted into the circuit, and a trigger circuit 4 for lighting the photographing light source 3.
7, a charging resistor 48 and a discharging capacitor 49 are provided.

When performing fluorescence fundus photography, first, a fluorescent agent is injected into the subject, the solenoid 21 is excited by an excitation current opening/closing means (not shown), and the exciter filter 5 is
is inserted, and the fundus Ef is illuminated with the light shown in characteristic A in FIG. A few seconds after injecting the fluorescent agent, wait until the fluorescent light is emitted from the fundus Ef, and then press the gripping rod 3.
Press the 0 operation button 31 by 1/2 stroke as shown in Fig. 4 to close the contacts Sa and Sb of switch S2.
6, an exciting current flows from the power supply 40 to the solenoid 20, and the solenoid 2
0 is excited and the barrier filter 11 is inserted into the photographing optical path.

At the same time, relay 44 is also energized, switch S4 is switched to the normally open NO side, and UJT 46 is turned on.
The time constant to turn on is the time constant of the resistor/capacitor circuit R1・C1 to R1・R2・C1/(R1+R2)
The timing at which the UJT 46 turns on in the output waveform of the power supply 41 shown in FIG.
Move from point to point b, thyristor 45 is UJT4
6, the thyristor 45 is turned on, and the energization time of the thyristor 45 increases from Ta to Tb shown in FIG. Therefore, the amount of light from the observation light source 1 increases, and in this state it becomes possible to observe and photograph a fluorescent image.

However, before the fluorescent image appears on the fundus Ef, with the barrier filter 11 inserted, nothing can be seen as an observation image of the fundus Ef, and it is necessary to correct the camera position shift and focus shift in order to take good pictures. I can't. In this case, operation button 3
1, the operating button 31 returns to the state shown in FIG. 3 due to the return force of the spring contact of the switch S2. In this state, contacts Sa and Sb of switch S2
are mutually non-conductive, the excitation current to the solenoid 20 is cut off, and the barrier filter 11 is removed from the photographing optical path. At the same time, the excitation current of the relay 44 is cut off, the switch S3 is switched to the normally closed NC side, and the time constant for turning on the UJT 46 increases from R1・R2・C1/(R1+R2) to R1・C1, as shown in FIG. The timing at which the UJT 46 turns on moves from point b to point a, and the energization time of the thyristor 45 also decreases from Tb to Ta, and the observation light source 1
The light amount of 1 decreases. Since the fundus Ef can be observed in this state, it is possible to adjust the positional shift and focus shift.

Once you have finished correcting the camera, press the gripping rod 30 again.
When the operation button 31 is pressed by 1/2 stroke as shown in FIG. 4 to bring the contacts Sa and Sb of the switch S2 into electrical continuity, it becomes possible to observe and photograph the fluorescent image of the fundus Ef.

Now, for fluorescence photography, move the operation button 31 further from the position shown in Figure 4 as shown in Figure 5.
By pressing 1/2 stroke, the contacts Sb and Sc of the switch S2 become conductive, and the signal lines L1 and L2 of the trigger circuit 47 are short-circuited, and the discharge capacitor 49
The amount of charge is released and the photographing light source 3 emits light instantaneously. This completes the first photographing, but at the same time, the flip-flop circuit 51 shifts to the set state and drives the relay 50. As a result, contact S1a of switch S1 is switched to the normally open NO side, and the circuit connected to S1a is
It is constantly shorted to L ₂ and energizes the solenoid 20,
The barrier filter 11 is continuously held in the photographing optical path regardless of the state of the switch S2.

Furthermore, the contact S1b of the switch S1 is also switched to the normally open NO side, and the state of the circuit _L1 is dependent on the contacts Sa and Sb of the switch S2, that is, the operating button 31 of the gripping rod 30 is shown in FIG. Trigger circuit 4 is pressed with only 1/2 stroke as shown.
A signal is output to 7, and the photographing light source 3 is switched to emit light.

This facilitates second and subsequent imaging.

In the above embodiments, the operation related to the barrier filter has been described, but the same applies to the exciter filter.

Furthermore, the exciter filter and the barrier filter may be integrally operated in the same manner.

In the above-described embodiment, the switch S2 uses a spring contact, but a magnet may be provided at the bottom of the operation button 31 and a reed switch may be used for the contacts Sa, Sb, and Sc.

As described above, according to the present invention, the first
After the first photograph is taken, an exciter filter and/or barrier filter is held in the optical path,
Shooting from the second time onwards can be carried out efficiently.

[Brief explanation of the drawing]

FIG. 1 is a characteristic diagram of an exciter filter and a barrier filter, FIG.
The figure is a sectional view of the gripping rod, Figures 4 and 5 are diagrams explaining its operation, Figure 6 is a block diagram of the operating circuit, Figure 7 is a diagram explaining the operation of the observation light source, 1 is the observation light source, 3 1 is a photographing light source, 5 is an exciter filter, 8 is a perforated mirror, 10 is an objective lens, 11 is a barrier filter, 14 is a movable mirror, 16 is a photographic film, 19 is a viewfinder, 2
0 and 21 are solenoids, 30 is a gripping rod, 31 is an operation button, 50 is a relay, 51 is a flip-flop circuit, and S1, S2, and S3 are switches.

Claims (1)

[Claims] 1. Fluorescence ophthalmology photography is possible by inserting an exciter filter into the illumination optical path and a barrier filter into the imaging optical path, and in normal operation, the exciter filter and/or barrier filter are inserted into the optical path. The photographing device has an operation means for returning the filter to the outside of the optical path after the first photograph has been taken, and a means for detecting that the first photograph has been taken and holding the filter inserted in the optical path in the optical path. An ophthalmologic imaging device characterized by having: 2. The operating means has a two-stroke operation,
The circuit is connected so that the filter is inserted into the optical path in the first stroke and the photographing light source is emitted in the second stroke, and after the first photograph is taken, the photographing light source is emitted in the first stroke. An ophthalmological imaging device according to claim 1. 3. The ophthalmologic photographing apparatus according to claim 1, wherein said holding means has a flip-flop circuit, and is brought into a set state by the first photographing.