JPH01300924A - Ophthalmology imaging device - Google Patents

Abstract

PURPOSE:To well perform photographic film recording and video recording, by making it possible to insert and separate a correction filter in front of a video imaging apparatus when the video imaging apparatus is used as an imaging member. CONSTITUTION:An eyeground image is observed through a prism 15 and an eyepiece 16. At the time of imaging, a reflecting mirror 13 is detached from a light path and the eyeground image is projected on an imaging film 17 and a movable mirror 18 is arranged between an image forming lens 11 and the first imaging camera 12 and, when this movable mirror 18 is inserted in a main light path, an auxiliary light path is formed and a fixed mirror 19 and the second imaging camera 20 are arranged to said auxiliary light path. A color correction filter 28 is interposed between the movable mirror 18 and the fixed mirror 19 and can be inserted in and detached from the auxiliary light path in connection with the insertion and detachment of the movable mirror 18 with respect to the main light path.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fundus camera used for observing, photographing, recording, etc. the fundus of the eye.

[Conventional technology]

Knowledge of fundus images obtained through fundus examination plays an important role not only in ophthalmology but also in the diagnosis of internal medicine related to the cardiovascular system. Therefore, the fundus image is recorded in order to observe the image taken by the fundus camera at a later date and observe changes over time.

In conventional fundus cameras, for example,
As disclosed in Japanese Patent Application Laid-open No. 380, Japanese Patent Application Laid-Open No. 59-49738, Japanese Patent Application Laid-open No. 61-220625, and Japanese Patent Application Laid-Open No. 62-94134, using an imaging device such as a video camera, In addition to observing the fundus images, they were also recording and recording the fundus images.

[Problem to be solved by the invention]

Conventionally, it is known that a fundus camera uses an imaging device such as a video camera to record images, and an observation light source is used for both observation and recording.

Therefore, a large amount of irradiation light must be applied to the eye to compensate for the insufficient amount of light, but this causes pain to the subject. Therefore, it is desirable to irradiate strobe light intermittently to effectively photograph and record the fundus even in a short period of time, and to reduce the pain caused to the subject.

Thus, for example, a tungsten bulb is used for observation and a strobe light from a xenon lamp is used for recording, but in that case, the tungsten bulb and xenon lamp have different color temperatures, so the color tone of the fundus will depend on the observation light. What you see with the camera and what you record with the strobe light will be different. Color correction for this is complicated because it must be performed for each light source, and furthermore, the operations for this are complicated.

-i, it is necessary for the imaging device to perform color correction according to a certain color temperature (when a tungsten bulb is used as the illumination light source, the color temperature is 300'), but this correction can be done on the panel surface. There were few such systems, and even if they did, they were not easy to operate.

Beyond that, it is extremely difficult to correct the color temperature of light sources that are instantaneously intermittent, such as strobe light.

The present invention has been made in view of these conventional problems, and its purpose is to record a photographic film that is later used for precise diagnosis of the fundus of the eye, and to record a video that can be immediately used for diagnosis. To provide an ophthalmologic photographing device capable of performing recording without color correction each time.

[Means to solve the problem]

In order to achieve the above object, the ophthalmological photographing apparatus of the present invention includes an illumination optical system that illuminates the fundus of the eye to be examined, and a photographing and observing optical system that uses reflected light from the illumination optical system as photographing light or observation light, In order to form a sub optical path whose optical path is converted from the main optical path of the photographing and observation optical system, a reflecting member is provided in the main optical path so as to be insertable and detachable, and a first beam disposed in the main optical path is inserted and removed by the insertion and removal of the reflecting member. In an apparatus capable of operating a photographing and observing means or a second photographing and observing means disposed in the auxiliary optical path and switching the reflecting member depending on the photographing mode, when a video imaging device is used as the photographing member, the above-mentioned The present invention is characterized in that a correction filter can be inserted and removed in front of the video imaging device.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An ophthalmologic photographing apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic configuration of an ophthalmologic photographing apparatus according to an embodiment of the present invention. In FIG. 1, light emitted from an observation light source 1 passes through a condenser lens 2 and once forms an image, and a photographing light source 3 is provided at this image formation position.

A condenser lens 4 is provided in front of the photographing light source 3, and light passing through the condenser lens 4 reaches a ring-shaped aperture stop 5. Furthermore, the light that has passed through the ring-shaped aperture stop 5 is deflected by a reflecting mirror 6, passes through a relay lens 7, and reaches an oblique perforated reflecting mirror 8 disposed at a conjugate position thereof.

The light reflected by this perforated reflector 8 passes through an objective lens 9 and reaches the fundus of the eye E to be examined. In this way, an illumination optical system that illuminates the fundus of the eye E to be examined is configured.

On the other hand, the light reflected from the fundus E is -
- After being imaged once, it passes through the opening of the oblique perforated reflector 8. Furthermore, the light that has passed through the diagonal perforated reflector 8 is configured to form a fundus image by a focusing lens 10 and an imaging lens 11.

Further, a first photographing camera 12 is provided on the optical axis extension of the imaging lens 11.

During observation, the reflective mirror 13, which can be lifted and lowered, is held in the lowered position shown by the solid line in the figure, so that the fundus image formed on the focusing plate 14 can be observed through the prism 15 and the eyepiece 16. It has become. At the time of photographing, the reflecting mirror 13 is held by jumping out of the optical path as shown by the broken line in FIG. 1 by a photographing switch to be described later.
A fundus image is now captured on the photographic film 17. In this way, a photographing and observing optical system is constructed, and the first photographing camera 12, which is the lower stage of the first photographing and observing optical system, is provided.

Next, a movable mirror 18 as a reflecting member is disposed between the imaging lens 11 and the first photographing camera 12, and this movable mirror 18 can be freely inserted into and removed from the optical path by a control circuit to be described later. It becomes. When the movable mirror 18 is held at the position indicated by the broken line in FIG. 1, a sub optical path is formed by converting the optical path from the main optical path.

This sub-light path is further converted into an optical path by a fixed mirror 19 disposed in the sub-light path, and reaches a second photographing camera 20 as a second photographing and observing means.

Note that a color correction filter 28 is interposed between the movable mirror 18 and the fixed mirror 19.
can be inserted into and removed from the sub optical path in conjunction with the insertion and removal of the movable mirror 18 from the main optical path. This second
The photographing camera 20, like the first photographing camera 12, includes a reflecting mirror 21 that can jump up and down, and a focusing plate 22.
, a prism 23, an eyepiece 24, and a photographic film 25.

FIG. 2 is a schematic diagram of an optical system for explaining another embodiment of the second photographing means. It consists of a fixed mirror 19, an image pickup tube 26, a monitor television 27, a color correction filter 28 and an image memory 29 which are disposed in and out of the optical path of the optical system. That is, as shown in FIG. 2, the second photographing camera 20 is
It is also possible to configure it as a monitor viewing means such as a monitor television 27 connected to the image pickup tube 26. In the present invention, the second photographing camera 20 and the imaging tube 26 are collectively referred to as a second photographing and observing means.

FIG. 3 shows one embodiment of a control circuit for switching between various photographing modes obtained by each photographing and observing means. In FIG. 3, the first photographing mode selection switch SW holds the movable mirror 18 away from the main optical path during observation;
When photographing, a reflective member is inserted into the main optical path. The on-contact t of the first photographing mode m selection switch SW is connected to a constant voltage power supply Vcc via a resistor R1, and is also connected to one input terminal of an OR gate G1.

The ON contact t2 of the second photographing mode selection switch SW2 is connected to the other input terminal of the 0R game 1-G.

This on contact t? , are also connected to the constant voltage power supply Vcc via the resistor R2.

The second photographing mode selection switch SW2 inserts and holds the movable mirror 18 in the main optical path during observation, and removes the movable mirror 18 from the main optical path during photographing. 2. The first and second photographing mode selection switches SW4 and SW2 are configured as seesaw switches, so that when one contact is closed, the other is opened.

The output terminal of the above OR gate G is A N ri game [G2
is connected to one input terminal of the ΔND game 1.
-c2's other input terminal is connected to the normally closed contact t4 of the camera switch SW, and this normally closed contact t4 is connected to the 1. and is connected to a constant voltage power supply Vcc.

The output terminal of the AND gate 1-c is connected to one input terminal of the EXOR gate 1-G3 via a stable multi-circuit M, and the other input terminal of the EXOR gate G3 is connected to the second shooting mode. On contact t2 of selection switch SW2
is connected. The output terminal of EX○R gate G3 is N
It is connected to one input terminal of OR gate G4.

A normally closed contact t3 of a third photographing mode selection switch SW is connected to the other input terminal of the NOR gate G4, and this normally closed contact G3 is connected to a constant voltage power supply Vcc via a resistor R3. The third photographing mode selection switch SW3 is used to hold the movable mirror 18 away from the main optical path both during observation and during photographing.

A monostable multi-circuit M is installed at the output terminal of NOR gate G4.
2, M3 is connected. The output side of one monostable multicircuit M2 is connected to the base of the transistor T1 via a resistor R6, and this base is grounded via a resistor R6. The output side of the other monostable multi-circuit M3 is connected to the base of the transistor T2 via a resistor R7, and this base is grounded via a resistor Re'.

The emitter of the transistor T is grounded, and the collector thereof is connected to a constant voltage power supply V8 via a mirror lifting solenoid SQL of the movable mirror 18. On the other hand, the emitter of the transistor T2 is grounded, and its collector is connected to the constant voltage power supply V8 via the mirror lowering solenoid 5QL2 of the movable mirror 18. Note that the output terminal of the AND game Gz is connected to the monostable multicircuit M4.

The monostable multi-circuit M4 outputs the photographing start signal after the movable mirror 18 is inserted into and removed from the main optical path and the pounding of the mirror 18 is delayed by, for example, 300 m5, and this photographing start signal is I is input to the highest sinking operation circuit S.

An operation signal from the photographing operation circuit S causes a series of photographing operations within the photographing camera, such as flipping up the reflecting mirror (reflecting mirror 13 or reflecting mirror 21) within the photographing camera, emitting light from the photographing light source 3, and opening and closing the camera shutter. It will be done.

FIG. 4 shows a time chart showing the sequence of a series of photographing operations executed in the selected photographing mode.

In FIG. 4, in step 100, it is determined whether the photographing mode is the first photographing camera 12 or the second photographing camera 20. If photography by the second photography camera 20 is selected, the process advances to step 102, where preparations for insertion of the color correction filter 28 are made. The insertion preparation in step 104 is for proceeding to the next step with a time delay of, for example, 350 m5. Subsequently, the process proceeds to step 104, where it is determined whether or not the photographing switch SW4 is turned on.

If YES is determined in step 104, the process proceeds to step 106, where the color correction filter 28 is inserted into the main optical path, and in step 108, the photographing light source 3 emits light. In step 110, the color correction filter 28 is removed from the main optical path, and the process returns to step 100.

When it is determined in step 100 that the first camera 12 is shooting, the process advances to step 120, where the shooting switch SW is turned on.
4 is ON or not. Step 1
If YES is determined in step 20, the process proceeds to step 122, the photographing light source 3 emits light, and the process returns to step 100.

In steps 104 and 120, the photographing switch SW4
If the determination is No because the is not ON, the process returns to step 100.

Next, regarding the operation of the embodiment of the present invention, the optical system diagrams shown in FIGS. 1 and 2, the control circuit diagram shown in FIG.
This will be explained with reference to the time chart of the photographing operation shown in the figure.

(A) When using the ophthalmologic imaging device as a fundus camera In the embodiment shown in FIG. 1, the third photographing mode is selected.

That is, the third photographing mode selection switch S keeps the reflective member separated from the main optical path both during observation and during photographing.
Press W3 and its normally closed contact is opened. The voltage level at this contact changes from low (L) to high (H), and this change causes a change in the output level of NOR gate G4, and the monostable multicircuit M3 that operates on the falling pulse is activated to lower the mirror. Solenoid 5OL2 is energized. The movable mirror 18 is removed from the main optical path. This is shown in FIG. 1 by the solid line position of the movable mirror 18. Therefore, the image of the fundus E illuminated by the observation light source 1 can be observed through the eyepiece 16 of the camera 12. Focusing and positioning of the fundus image is performed by a focusing lens 10.

Next, in order to photograph the fundus image on the photographic film J, 17 of the camera 12, the operation switch sW is pressed. Operation switch S
By pressing W4, a photographing start signal is input to the photographing operation circuit S. Next, a series of operations such as raising and lowering the reflecting mirror 13, emitting strobe light from the photographing light source 3, and opening and closing the camera shutter are performed in response to an operation signal from the photographing operation circuit S.

After photographing is completed, the movable mirror 18 remains out of the main optical path, and the normally closed contact of the third imaging mode selection switch SW remains open and is at the iI level.

Here, when the third photographing mode selection switch SW is pressed again, the contact is closed and the voltage level of the contact changes from H to 1.
This change causes a change in the output level of the NOR gate G4, and the monostable multi-circuit M2, which is activated by the rising pulse, is activated and the mirror raising solenoid I' S Q L
, conducts, and the movable mirror 1 is inserted into the main optical path.

This means that the state has returned to the state before the start of the photographing mode. The cycle cycle described above is represented in FIG. 4 by a loop starting from step 100, passing through step 120, step 122, and returning to step 100.

(B) When observing with the first photographing camera 12 and then photographing with the second photographing camera 20, the first photographing mode is selected. That is, during observation, move the movable mirror 18 from the main optical path: L1 (take it out and hold it), and during imaging, do not press the first imaging mode selection switch SW, which inserts the movable mirror 18 into the main optical path.

The first photographing mode selection switch SW and the second photographing mode selection switch constitute a seesaw switch, and when one contact is closed, the other contact is closed. Therefore, the contact of the first photographing mode selection switch SW is closed, and the contact of the second photographing mode IS selection switch SWz is open.

Both switches SW, SW.

A pulse is generated by a change in the contact level voltage, and a monostable multicircuit M3 activated by the falling pulse is activated.Then, the mirror lowering solenoid SQL is energized, and the movable mirror 18 is removed from the main optical path. In this way, observation using the first camera 12 can be performed.

Next, after completing the observation, press the photographing switch (7-inch SW) and open its normally closed contact.The monostable multicircuit M is activated by the change in the contact level, and its output level changes from L to ■(
becomes. This level voltage change is applied as a rising pulse to the monostable multicircuit M2. Then, the monostable multi-circuit M2, which operates in the vertical direction, is activated and the transistor T is turned on, and the mirror lifting solenoid SOL is guided, and the movable mirror 1)) is inserted into the optical path. Therefore, a sub-light path toward the fixed mirror 19 is formed, and the second photographing camera 20 performs photographing.

The photographing operation is executed as follows. When the photographing switch SW is pressed, a photographing start signal is manually input to the photographing operation circuit S. Next, a series of operations such as raising the reflecting mirror 21, emitting strobe light from the photographing light source 3, and opening and closing the camera shutter are performed in response to an operation signal from the photographing operation circuit S.

When shooting is finished, this shooting mode will be changed to the original shooting star I.
- Return to the previous state, which is done as follows. When the photographing switch SW4 is pressed, the stable multi-circuit M is maintained at a high level for a predetermined period of time and outputs a high-level signal, but after this time has elapsed, its output changes from I to L. The monostable multi-circuit M3, which is activated by the falling pulse, is activated, the transistor T2 becomes conductive, and the mirror lowering solenoid SQL is energized. The movable mirror 18 leaves the main optical path. Therefore, observation using the first photographing camera 12 becomes possible.

The second photographing camera 20 shown in FIG. 1 can also be configured as an observation means such as a monitor television 27 connected to an image pickup tube 26 as shown in FIG. Furthermore, by connecting an image memory 29 to the image pickup tube 26, a fundus image can be recorded. This photographing sequence is shown in 1. in FIG. Step 100.102.104.106.10
8. Return to step 100 via 110.

(C) When observation is performed using the eyepiece lens 16 of the first photographing camera 12 and the fundus image is recorded using the imaging tube 26 and the image memory 29 connected thereto, the observation is performed in the same manner as in (B) above. That is, by selecting the first photographing mode and pressing the first photographing mode selection switch SW1, the movable mirror 1
8 is removed from the main optical path. Therefore, positioning and focusing are performed using the focusing lens 12 while observing the fundus image using the eyepiece 16.

Next, if recording is to be performed, the operation switch SWa is pressed. S
By opening the contact of W4, the monostable multicircuit M2 is activated and the transistor T is activated.

conducts, the mirror lifting solenoid SQL is energized, and the movable mirror 18 is inserted into the main optical path.

Therefore, a sub-optical path toward the fixed mirror 19 is formed, and recording is performed by an image memory 29 connected to the image pickup tube 26.

The recording operation is performed as follows. When the photographing switch S W a is pressed, a recording start signal is input to the photographing operation circuit S. Next, a series of operations such as insertion of the color correction filter 28, flash emission of the photographing light source 3, opening and closing of the camera shutter, and removal of the color correction filter 28 from the optical path are performed in response to an operation signal from the photographing operation circuit S.

By the way, a monostable multi-circuit M4 is connected to the input side of the photographing operation circuit S. The monostable multi-circuit M4 outputs a photographing start signal after being delayed by the time required for the bounce of the movable mirror 18 to end, for example, 300 m5, which is caused by the lowering and raising of the movable mirror 18, and this photographing start signal is sent to the photographing operation circuit. is input.

When recording ends, this recording mode returns to the state before recording started, and this is done as follows. Ever since the photographing switch SW4 is pressed, the monostable multicircuit M is maintained at a high level for a predetermined period of time and outputs a high level signal. After this time has elapsed, the output changes from H to L, and the monostable multi-circuit M3, which operates with a falling pulse, operates, and the transistor T2 becomes conductive.
Since the mirror lowering solenoid sot,z is energized, the movable mirror 18 is removed from the main optical path. Therefore, observation using the first photographing camera 12 becomes possible.

In FIG. 4, the above-described operation sequence returns to step 100 via steps 100.102.106, ioa, 110, or returns to step 100.102 in step 7.
．． The process returns to step 100 via step 104.

(D) When both observation and recording are performed using the second photographing device, the second ↑ darkest mode selection switch SW2 closes its on contact. As a result, the movable mirror 18 is inserted into the main optical path, so that the image reflected from the fundus enters the image pickup tube 26 via the fixed mirror 19, and its output is input to the television camera 27. Therefore, while observing the TV image, the focusing lens 1
Positioning and focusing can be performed using 0.

Then, when recording is to be performed, the first photographing mode selection switch SW1 closes its on contact.

Thereby, the movable mirror 18 is removed from the main optical path.

Subsequently, by pressing the photographing switch SW a, the movable mirror 18 is inserted into the main optical path, and in conjunction with this, the color correction filter 28 is also inserted into the auxiliary optical path. Furthermore, a recording start signal is input to the photographing operation circuit S by pressing the photographing switch SW4. Next, a series of operations such as insertion of the color correction filter 28 and flashing of the photographing light source (recording light source) 3 are performed in response to an operation signal from the photographing operation circuit S. Therefore, the fundus image enters the image pickup tube 26, is recorded in the image memory 29, etc., and is also displayed on the television monitor 27. The information recorded in the image memory is stored for later use.
It is also possible to record and store it on a magnetic disk or optical disk.

This photographing sequence is the same as in case (C).

In the embodiments described above, the imaging device is a color one, but if a monochrome imaging device is used, a color correction filter is not necessary.

Further, although the color correction filter is assumed to be a Xe lamp, it is not limited to this, and various changes can be made as necessary, such as expansion of color rendering properties.

〔Effect of the invention〕

Since the present invention is configured as described in detail above, it is possible to observe the fundus with a tungsten bulb and then use a light source with a different color temperature such as a xenon lamp for photographing. By inserting a color correction filter in front of the photographing device or the imaging device, there is no need to perform complicated color adjustments to the photographing light source, so the optometrist can concentrate on diagnosis.

Further, due to its nature, the present invention is not limited to a specific imaging device, but can be widely applied to various color and monochrome devices.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an optical system for explaining an embodiment of the ophthalmologic photographing device of the present invention, FIG. 2 is a schematic configuration diagram of an optical system for explaining another embodiment of the second observation photographing means, and FIG. 4 is a circuit diagram showing an embodiment of the control circuit, and FIG. 4 is a time chart showing the sequence of photographing operations executed in the selected photographing mode. 12--1--1st photographing camera 18--1 movable mirror 20--12nd photographing camera 26--Video photographing tube 28--1 color correction filter E- ---1 eye to be examined SW, ---1st photography mode selection switch SW2--2nd photography mode 1'' selection switch 5W3-11-3rd photography mode selection switch SW4---Photography switch

Claims (3)

[Claims] (1) It has an illumination optical system that illuminates the fundus of the eye to be examined, and a photographing and observing optical system that uses reflected light from the illuminating optical system as photographing light or observation light, and the optical path is converted from the main optical path of the photographing and observing optical system. A reflecting member is inserted into and removed from the main optical path to form a secondary optical path, and when the reflecting member is inserted and removed, the first photographing and observing means disposed in the main optical path or the secondary optical path is In a device that operates a second photographing and observing means and can switch the reflecting member depending on the photographing mode, when a video imaging device is used as the photographing member, a correction filter can be inserted and removed in front of the video imaging device. An ophthalmological imaging device characterized by: (2) The ophthalmological imaging device according to claim (1), wherein the video imaging device is a color television camera. (3) The ophthalmologic photographing apparatus according to claim 1, wherein the color correction filter is inserted into and removed from the auxiliary optical path in conjunction with the insertion and removal of the reflective member from the main optical path.