JPH0228883Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Industrial Application Field) This invention relates to a fundus camera, and particularly to a filter warning device for a fundus camera, which is equipped with an optical system for observing and photographing the eye to be examined, and an illumination optical system for illuminating the eye to be examined. It is. (Prior Art) As one of the ophthalmological clinical examination methods, examination using fluorescence fundus photography is widely practiced. In this case, a fluorescent contrast agent is injected from the subject's cubital vein, and when it reaches the fundus retinal blood vessels, the reflected light from the fundus illuminated by the illumination light that has passed through the fluorescent excitation filter can be observed and photographed. The optical system passes through a fluorescence filter to observe and photograph only the retinal blood vessels that emit fluorescence, but at the same time as the observation and photography, the time from the start of intravenous injection of the contrast agent to the time it reaches the retinal blood vessels, that is, the retina. Circulation time may be measured, and in either case, observation, photography, and time measurement must be started within a short second. In addition, the fluorescence excitation filter inserted into the optical path of the illumination optical system allows the contrast agent to exhibit an absorption peak in the blood.
The contrast agent is filtered around 490 nm, giving it a blue color, and in the optical path of the observation/photographing optical system, the contrast agent filters around 520 nm, where the fluorescence peaks, giving it a pale yellow color. Those that exist are used. In order to avoid false fluorescence, the wavelength ranges are designed to avoid overlapping as much as possible. (Problem to be solved) However, the above-mentioned filter functions to excite the fluorescence of the fundus retinal blood vessels into which the contrast medium has been injected, and to strengthen the contrast between other areas that do not emit fluorescence. Therefore, when the contrast medium has not reached the fundus, the fundus image is hardly visible in the field of view for observation and photography. Therefore, before starting intravenous injection of a contrast medium, aiming at the fundus is often done by removing one side of the filter (often the filter on the observation/imaging side), and sometimes it is mistaken to leave it as it is and do not use the contrast medium. The problem was that the agent started to circulate in the retinal blood vessels, and this was not noticed too late, resulting in a missed opportunity to take pictures. or,
On the other hand, since the color of the filter is particularly pale, there is a problem in that people forget to remove it even after fluorescence photography and continue to take normal color fundus photography. (Means for Solving the Problems) The present invention was made to solve the above-mentioned conventional problems, and includes an optical system for observing and photographing the eye to be examined, and an illumination optical system for illuminating the eye to be examined. Separate filters supported by respective movable means are disposed in and out of each optical path of the system so as to be removable together with the movable means, and each separate filter is operated in conjunction with the movement of each movable means into and out of each optical path. A light emitting means is provided which blinks when the switches are operated, and when the respective filters enter or exit the respective optical paths together, the light emitting means continues to light up, A configuration is adopted in which the light emitting means repeats blinking when one of the light emitting devices enters the optical path and the other exits, or vice versa. (Function) According to the above configuration, if the filter is not inserted properly in the preparation stage for fluorescence fundus photography of the subject's eye, the light emitting means will repeatedly flash and a warning will be automatically issued, and the filter will not be properly inserted. When inserted into the optical path, the light stops blinking and lights up continuously, allowing the area around the filter operation section to be illuminated. (Example) Hereinafter, details of the present invention will be explained based on an example shown in the drawings. FIG. 1 is a side view of the first embodiment of the present invention, in which reference numeral 1 indicates the entire fundus camera, and an objective lens frame mounting portion 1a to which an objective lens frame 2 is attached.
is fixedly installed, and a film box 11 and an eyepiece lens barrel 10 are installed on the opposite side thereof. FIG. 2 is an optical path diagram of the fundus camera 1. The objective lens 2a incorporated in the objective lens frame 2 mentioned above faces the eye E to be examined, and the optical axis is located behind the fundus camera 1.
A perforated mirror ₃ , a filter 4a as a fluorescent filter, a focusing lens 5, an imaging lens 6, and a movable mirror 7 are arranged in this order along the optical axis _L1 of the movable mirror 7. Prism (or mirror) on the optical axis L ₂ branched from the point of intersection
8. A focusing glass 9 and an eyepiece 10a are arranged along an optical axis _L3 bent by the reflective surface of the prism 8. From the objective lens 2a described above to the eyepiece lens 1
0a constitutes the observation optical system. When the movable mirror 7 is at the position indicated by the broken line in the figure, the film 2 loaded in the film box ₁₁ is moved backward along the optical axis L1.
1 is arranged. The components from the objective lens 2a to the imaging lens 6 are part of the structure of the observation optical system, and also constitute a photographing optical system. On the other hand, below the fundus camera ₁ shown in FIG _.
along the illumination lamp 1 as an observation illumination light source.
2, a first illumination lens 13, a strobe lamp 14 as a photography illumination light source, a B filter 15a as a fluorescence excitation filter, a second illumination lens 16,
A prism (or mirror ₎ 17 is arranged, and a ring slit ₁₈ , a third
An illumination lens 19 and a fourth illumination lens 20 are disposed, and the point at which the optical axis _L5 is extended coincides with the point at which the optical axis _L1 intersects with the perforated mirror 3. Therefore, when the illumination lamp 12 is turned on, the light is
The first illumination lens 13, the B filter 15a, the second
It passes through the illumination lens 16 and is reflected by the prism 17, passes through the ring slit 18, the third illumination lens 19, and the fourth illumination lens 20 arranged along the optical axis _L5 , and then passes around the hole of the perforated mirror 3. The light is reflected by the reflective surface of the light beam, enters the objective lens 2a along the optical axis _L1 , and is converged to illuminate the eye E to be examined. Also, when the strobe lamp 14 emits light, the light passes from the B filter 15a to the fourth illumination lens 20.
The light is reflected by the perforated mirror 3 in the same manner as described above, and the eye E to be examined is irradiated. The above-described illumination lamp 12, first illumination lens 13, strobe lamp 14, and B filter 15
A, a second illumination lens 16, a prism 17, a ring slit 18, a third illumination lens 19, a fourth illumination lens 20, a perforated mirror 3, and an objective lens 2a constitute an illumination optical system. 3 and 6 show the first embodiment of the present invention in the same way as FIG. 1, and FIG. 3 shows the section A-A in FIG. , A filter 4a and B filter 15a are shown out of their respective optical paths, and FIG. 3B shows a state in which both filters are in their respective optical paths. 1b is the upper surface of the fundus camera 1;
1c is a side surface, and a guide 1d for guiding and supporting the A filter frame 4 in and out of the optical path and a guide 1e for guiding and supporting the B filter frame 15 in and out of the optical path are fixedly installed on the side surface 1c. The ends of the setscrews 22 and 23 screwed into them are connected to the guide groove 4c of the A filter frame 4 and the B
It engages with the guide groove 15c of the filter frame 15. When the A filter 4a enters the optical path, the side surface 4b of the A filter frame 4 is connected to the A switch 2 installed in the fundus camera 1, as shown in FIG. 3B.
Push up the actuating piece 24a of No. 4 to turn the A switch 24 "on," and when it comes out of the optical path as shown in FIG. 3A, the actuating piece 24a returns and turns "off."
becomes the state of Similarly, when the B filter 15a enters the optical path, the side surface 15b of the B filter frame 15 is connected to the B switch 2 installed inside the fundus camera 1.
Push up the actuating piece 25a of 5 and turn the B switch 25.
When it is turned "on" and out of the optical path, the actuating piece 25a returns to the "off" state. As shown in FIGS. 1 and 6, 26 is the light emitting part of A-LED which is the light emitting means, and the guide 1d
When the light is emitted, it is visible and the A filter frame 4 and its surroundings are illuminated. Reference numeral 27 denotes a light emitting part of a B-LED, which is a light emitting means, and is attached to the guide 1e. When it emits light, it can be seen visually and also illuminates the B filter frame 15 and its surroundings. do. FIG. 10 shows a circuit diagram of an embodiment of the present invention, in which one terminal of the A switches 24 and 28 is grounded, the other terminal is connected to the input side of the inverter 51, and a positive voltage is applied through the resistor _R1 . is applied. The output side of the inverter 51 is connected to one input side of an OR gate 53 and one input side of an exclusive NOR gate 57. One terminal of the B switches 25, 29 is grounded, and the other terminal is connected to the input side of the inverter 52, and a positive voltage is applied through the resistor _R2 . The output side of the inverter 52 is connected to one input side of the OR gate 54 and the exclusive NOR gate 5.
7 to the other input side. The output side of the pulse generator 50 is an OR gate 5
3 and 54, respectively, are connected to the other input side. The output side of the OR gate 53 is connected to one input side of the OR gate 55, and the output side of the OR gate 54 is connected to the input side of the OR gate 55.
It is connected to one input side of OR gate 56. The output side of the exclusive NOR gate 57 is connected to the other input side of each of the OR gates 55 and 56. The output side of the OR gate 55 is connected to the base of the transistor 58 through a resistor R ₃ , a positive voltage is applied to the anode side of the light emitting diode 26 through a resistor R ₅ , and the cathode side is connected to the base of the transistor 58 .
connected to the collector. The output side of the OR gate 56 is connected to the base of the transistor 59 through a resistor _R4 , the anode side of the light emitting diode 27 is applied with a positive voltage through the resistor _R6 , and the cathode side is connected to the collector of the transistor 59. There is. The emitter sides of transistors 58 and 59 are each grounded. Next, the operation of the above configuration will be explained.
First, before starting fluorescence fundus photography, it is necessary to insert a fluorescence excitation filter into the optical path of the illumination optical system and a fluorescence transmission filter into the optical path of the observation/photography optical system. 3
From the state shown in Fig. A, the guide 1d is moved as shown in Fig. 3B, which shows the frames 4 and 15 in the position indicated by the two-dot chain line, that is, the state in which the A filter 4a and the B filter 15a are in their respective optical paths. and 1e and push it in. At this time, the A filter frame side surface 4b pushes up the switch operating piece 24a to turn the A switch 24 "on". Also, the B filter frame side surface 15b pushes up the switch operating piece 25, and the B switch 25
Turn on. In FIG. 10, when the A switch 24 is "on", the input of the inverter 51 becomes "L", so its output becomes "H". Also, B is switch 25
When also turned on, the input of the inverter 51 becomes "L" and its output becomes "H". As a result, both inputs of the exclusive NOR gate 57 become H, and its output becomes H. In addition, the H outputs of the inverters 51 and 52 are also used as inputs to the OR gates 53 and 54.
is connected, so whether the input from the other pulse generator of both OR gates 53 and 54 is H or L,
The outputs of both OR gates 53 and 54 become H. Next, one input of each of the OR gates 55 and 56 is an exclusive NOAH gate 57.
The output H is also the other input of the OR gates 55 and 56.
Since the outputs of each of OR gates 55 and 56 are high, the base currents of transistors 58 and 59 flow through resistors R ₃ and R ₄ , and current also flows to LEDs 26 and 27. flows and fires continuously. Next, A filter 4a comes out from the optical path,
To explain the case where the B filter 15a is in the optical path, the A filter 4a interlocks with the A filter 4a.
Since the switch 24 is off, the inverter 51
Since a positive voltage is applied through the resistor _R1 , the input becomes H, and its output becomes L and becomes one input of the OR gate 53, and the other input receives the pulse of the output of the pulse generator 50. H and L
By repeating this, the output of the OR gate 53 becomes a waveform in which H and L are repeated. On the other hand, since the B filter 15a is in the optical path, the B switch 25 is turned on, the input of the inverter 52 becomes L and its output becomes H, one input of the OR gate 54 also becomes H, and the other input becomes Regardless of whether it is H or L, its output will be H. Also, one input of the exclusive NOR gate 57 receives the output L of the inverter 51, and the other input receives the output H of the inverter 52, so its output becomes L. One input of the OR gate 55 receives the H and L repeating waveform of the output of the OR gate 53, and the other input receives the exclusive NOR gate 57.
The output L of the OR gate 55 becomes the input, and therefore the output of the OR gate 55 becomes H and L repeatedly, and the base current flows intermittently to the transistor 58 through the resistor _R3 , and as a result, the light emitting diode 26 also intermittently flows. The current flows and the light flashes repeatedly. Since the output of the OR gate 54 is H, one input of the OR gate 56 is H, and the other input is the L output of the exclusive NOR gate 57, so the output becomes a continuous H, and the output of the transistor 59 is passed through the resistor _R4 . The base current flows continuously, so the light emitting diode 27 lights up continuously. When the switches 24 and 25 are turned on and off in the opposite manner to the above-described case, the light emitting diode 27 blinks and the light emitting diode 26 lights up continuously. When fluorescent fundus photography is not being performed, both filters 4a and 15a are moved out of their respective optical paths.
4 and 25 are respectively turned off, and as can be seen from the above, both light emitting diodes 26 and 27 are continuously lit. Table 1 shows the relationship between the above-described entry into and exit from the optical path of both filters and the blinking or continuous lighting of both light emitting diodes.

[Table] Next, when performing fluorescence fundus photography, if either the A filter 4a or the B filter 15a is not in the optical path, both light emitting diodes 26 and 27 are configured to blink. Another example will be described. In FIG. 11, A is the switch 24, the resistor
The configuration of R ₁ , inverter 51, switch 25, resistor R ₂ , and inverter 52 is connected in the same way as in the embodiment shown in FIG. 10 described above. The output terminals of the inverters 51 and 52 are separately connected to the two input terminals of the exclusive NOR gate 87, and the output terminal thereof is connected to the two input terminals of the exclusive NOR gate 87.
0, and the output end of the pulse generator 50 is connected to the other input end. The output terminal of the OR gate 60 is connected to the input terminals of buffers 61 and 62.
The output terminal of the buffer 62 is connected to the base of the transistor 58 through the resistor R ₃ , and the output terminal of the buffer 62 is connected to the resistor R ₄
through which it is connected to the base of transistor 59. The collector side of the transistor 58 is connected to the cathode side of the light emitting diode 26, and a positive voltage is applied to the anode side through a resistor _R5 . Further, the collector side of the transistor 59 is connected to the cathode side of the light emitting diode 27, and a positive voltage is applied to the anode side through the resistor _R6 . The emitter sides of both transistors 58 and 59 are grounded. The operation in the above configuration will be explained next. As shown in FIG. 3B, when filters 4a and 15a are both in the optical path, switches 24 and 25 are both turned on, and both inputs of exclusive NOR gate 57 are H, and its output is H. Therefore, since one input of the OR gate 60 becomes H, its output is always H regardless of whether the other is H or L, and the inputs of buffers 61 and 62 both become H, so that the output are both H,
The base currents of transistors 58 and 59 flow, and both light emitting diodes 26 and 27 light up. When both switches 24 and 25 are turned off, both inputs of exclusive NOR gate 57 are L and its output is H, and OR gate 60
Since one of the inputs becomes H, its output becomes H, and both light emitting diodes 26 and 27 light up as described above. When one of the filters enters the optical path and the other exits, one of the switches 24 or 25 is on and the other is off, and one input of the exclusive NOR gate 57 is high and the other is low.
Therefore, the output of the OR gate 60 is always L, and one input of the OR gate 60 is L, and the other input is a repeat of H and L in synchronization with the pulse from the pulse generator 50, so the output of the OR gate 60 is still a pulse. Both light emitting diodes 26 and 27 repeatedly blink as H and L synchronize with each other. Table 2 shows the relationship between on/off of the switches 24 and 25 and lighting or blinking of the light emitting diodes 26 and 27.

[Table] A second embodiment will be described in which the entrances and exits of the filters 4a and 15a into and out of the respective optical paths are configured differently from the above. 4, 5, and 7, the side surface 1c of the fundus camera 1 includes a guide 1f that exposes a part of the non-slip outer periphery of the filter disk 34 holding the filter 4a; A guide 1g is fixedly provided to expose a part of the non-slip outer periphery of the filter disk 35 holding the filter 15a. In addition, the filter disk 34 is integrally equipped with A.
A cam 30 is rotatably supported by a shaft 34a to a holding portion (not shown), and a B cam 31 is integrally supported by a shaft 35 to a holding portion (not shown). It is pivoted so as to obtain. 34b, 34c, and 35d are filter mounting holes provided in the disk 34, and in FIG. However, in this filter disk, it means that multiple filters can be used for other purposes, so there may be more than three filters. Similarly, the filter 15a was held in the hole 35b, and the holes 35c and 35d were left as transparent holes.
This is also the same as above. The A switch 28 is fixed to a holding part (not shown), and the tip of the switch operating piece 28a is connected to the A switch 28.
When the switch 28 contacts the outer periphery of the cam 30 at a lower position of the cam 30, the switch 28 is turned off, and when the switch 28 contacts the higher position, the switch 28 is turned on. The B switch 29 is fixed to a holding part (not shown), and when the tip of the switch actuating piece 29a touches the outer periphery of the B cam 31 and touches a low position of the cam 31, the switch 29 is in the OFF state and the switch is in the high position. It is configured so that it is in an on state when it comes into contact with the position. 1p is a hole provided on the side of the guide 1f,
Through this hole, a mark marked on the side of the filter disk 34 for identifying the filter inserted into the optical path can be visually recognized by lighting or blinking a light emitting diode 26 installed near the mark. It is configured. Similarly, the mark provided on the side surface of the disk 35 can be seen through the hole 1q provided on the side surface of the guide 1g.
A light emitting diode 27 installed near the light emitting diode 27 allows visual recognition. In the state shown in FIG. 5, filters 4a and 15 are in their respective optical paths, actuating pieces 28a and 29a are pushed up by the high positions of cams 30 and 31, and switches 28 and 29 are activated.
is on. When the disk 34 or 35 is rotated about the shaft 34a or 35a while pressing the exposed non-slip portion of the outer periphery, the filter 4a or 15a is removed from the optical path and the through hole 34 is rotated.
c, 34d or 35c, 34d is stopped by a click stop device (not shown) at a position overlapping the optical path, and when the rotation is stopped there, the cam 3
The lower part of 0 or 31 is the actuating piece 28a or 2
9a, the switch 28 or 29 is turned off. The operation of turning on and off the switch 28 or 29 is the same as in the embodiment described above, and will therefore be omitted. What is shown in Fig. 8 is the filter disk 3.
6 is rotatably supported by a shaft 36a to a holding part (not shown), which is a modification of the second embodiment described above.
Filter mounting holes 36b, 36c, and 36d are provided, and a recess 36e is provided in a part of the outer periphery of the filter mounting holes 36b, 36c, and 36d.When the filter enters the optical path, the switch 28
The tip of the actuating piece 28a matches the recess 36e to turn on the switch 28, and when the filter is removed from the optical path, the tip of the actuating piece 28a aligns with the recess 36e of the disk 36 without the recess. The switch 28 is configured to be turned off when the switch 28 is in contact with the outer periphery. In the third embodiment shown in FIG. 9, a knob 42 is integrated into a shaft 40 which is rotatably fitted into a bearing 41 fixed to the upper surface 1b of the fundus camera 1, and which projects from the upper surface 1b. A bevel gear 39 is also integrally attached to the other end. Further, a holding plate 1 fixedly installed inside the fundus camera 1
A bearing 1j is implanted in h, rotatably supporting a shaft 37a, and a filter disk 37 holding a filter 4a and a bevel gear 38 meshing with the aforementioned bevel gear 39 are integrally mounted on the shaft 37a. installed. On the outer periphery of the camera top surface 1b below the knurled part of the knob 42, there is a mark (not shown) that indicates that the filter 4a is in the optical path, and a mark is attached to the camera top surface 1b in the vicinity. It is constructed so that it can be visually recognized by illumination from a light emitting diode 26. In this case, the filter 4a can be moved in and out of the optical path by gripping the non-slip part of the knob 42 and rotating it around the shaft 40.The disk 37 moves from the shaft 37a through the bevel gears 38 and 39 that mesh with each other. It rotates around the center and stops its rotation at a predetermined position while looking at the mark on the outer periphery of the knob 42. In the embodiment described above, the light emitting diodes that light up or flash in conjunction with the entry and exit of the A filter and B filter into and out of the optical path are provided on the side or top surface of the fundus camera. , may be arranged and configured so that it can be visually recognized within the field of view of the observation optical system. (Effects) As is clear from the above description, the present invention provides a fundus camera equipped with an optical system for observing and photographing the eye to be examined, and an illumination optical system for illuminating the eye to be examined. A separate filter supported by a movable means including a respective operation part is arranged to be movable into and out of the optical path of the optical system and the illumination optical system together with the movable means; Separate switches that operate in conjunction with each other are provided, and a light emitting means that blinks when the switches are operated is provided near the operation section to illuminate when the filters enter or exit the respective optical paths together. In this case, the light emitting means continues to light up, and when one of the filters enters the optical path and the other exits, or vice versa, the light emitting means repeats blinking. The easily visible flashing light not only prevents forgetting to insert the filter into the optical path due to operational errors, but also
Since it also illuminates the mark corresponding to the filter, it is an extremely useful device, especially in the case of fluorescence fundus photography.

[Brief explanation of the drawing]

Figures 1 to 11 are for explaining embodiments of the present invention. Figure 1 is a side view of the first embodiment of the present invention, Figure 2 is an optical path diagram of the fundus camera, and Figure 3A is a diagram of the optical path of the fundus camera. The AA cross-sectional view in Figure 1 shows the filter coming out of the optical path, and Figure 3B shows the AA cross-sectional view in Figure 1, showing the filter entering the optical path. Fig. 4 is a side view of the fundus camera according to the second embodiment, and Fig. 5 is B of Fig. 4.
6 is a perspective view showing a part of the external appearance of the first embodiment, FIG. 7 is a perspective view showing a part of the external appearance of the second embodiment, and FIG. 8 is a perspective view showing a part of the external appearance of the second embodiment. FIG. 9 is a sectional view of the main parts of the third embodiment, FIG. 10 is a circuit diagram of one embodiment of the present invention, and FIG. 11 is a diagram of another embodiment of the present invention. FIG. 1... Fundus camera, 4... A filter frame, 4
a...A filter, 15...B filter frame,
15a...B filter, 24...A switch,
25...B switch, 26...A-LED, 27
...B-LED, 28...A switch, 29...
B switch, 30...A cam, 31...B cam,
34, 35, 36, 37... Filter disk, 42... Knob, 50... Pulse generator, 5
1,52...Inverter, 53-56,60...
OR gate, 57... Exclusive NOR gate, 58, 59... Transistor, 61, 62
...Batsuhua.

Claims (1)

[Scope of utility model registration request] In a fundus camera equipped with an optical system for observing and photographing the eye to be examined, and an illumination optical system for illuminating the eye to be examined, each operation section is connected to the optical path of each of the optical system and the illumination optical system. A separate filter supported by a movable means is disposed so as to be removable together with the movable means, and further includes separate switches that operate in conjunction with the movement of each movable means into and out of each optical path. A light emitting means that blinks when a switch is operated is provided near the operation section, and when the respective filters enter or exit the respective optical paths together, the light emitting means continues to light up, A filter warning device for a fundus camera, characterized in that the light emitting means is configured to blink repeatedly when one of the light emitting means enters the optical path and the other exits the optical path, or vice versa.