JPS5889237A - Eye bottom camera system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fundus camera system that can be used as both a mydriatic type and a non-mydriatic type.

Traditionally, fixation lights for guiding the gaze of mydriatic fundus cameras include:
An external fixation light is used to direct fixation with the eye opposite to the eye being examined. In this case, the subject's eye is dilated with a mydriatic agent, so no miosis due to nearsightedness reaction occurs and no problem occurs. It is said that it is preferable to use an internal fixation lamp in this type of fundus camera, since miosis due to near vision reaction will impede photography. In the case of fundus cameras that can be used for both mydriatic and non-mydriatic types, the process of removing the optical system for guiding the light to the photographing tube that converts an invisible image into a visible image and attaching it to the direct view finder eliminates this hassle. If a separate light guide system is installed in order to save space, it is necessary to block external light entering through the direct view finder during non-mydriatic photography using an internal fixation lamp. Therefore, it is necessary to provide a shutter or to have an optical path switching mechanism between the direct view finder and the internal fixation light, which has the drawback of making the fundus camera large and complicated.

An object of the present invention is to reduce the size of the device and improve operability by attaching a fixation light to a direct view finder that requires light shielding when used as a non-mydriatic camera and using it as an internal fixation light. The purpose of the system is to provide a fundus camera system, the gist of which is to provide a fundus camera system that allows the patient to be examined through an external fixation light when used as a mydriatic fundus camera and a direct view finder when used as a non-mydriatic eye camera. The device is characterized in that it includes an internal fixation lamp that emits light.

The present invention will be explained in detail based on illustrated embodiments.

FIG. 1 is a configuration diagram showing an embodiment of the optical system of the fundus camera according to the present invention, in which the eye to be examined E is observed using infrared light, and film photography is performed using visible light. The model shows a fundus camera. In Figure 1.1, l is a tungsten lamp which is an observation light source, and the light emitted from this tungsten lamp l is passed through a condenser lens 2,
A guichroic mirror 4 that reflects infrared light, transmits part of visible light, and reflects part of visible light via visible cut filter 3
incident on the condenser lens 5, where it is deflected and sequentially
It reaches the perforated mirror 9 via the ring slit plate 6 and the relay lens 7.8. Plan views of the ring slit plate 6 and the perforated mirror 9 are shown in FIGS. 2 and 3.

Further, a photographing strobe tube 10 is arranged behind the microchroic mirror 4, and the light from this strobe tube 10 passes through a condenser lens 11 to the microchroic mirror 4.
The light passes through the tungsten lamp 1 and enters the perforated mirror 9 through the same optical path as the light from the tungsten lamp 1. In addition, 12
．． 13 are 1 tungsten lamp and 1 strobe tube, respectively.
This is a reflective mirror that is placed behind the 0 and condenses and reflects these lights. The light that enters the perforated mirror 9 from the above-mentioned illumination optical system is reflected by the perforated mirror 9 in the direction of the eye E to be examined, illuminates the fundus Ef of the eye E, passes through the original optical path, and then passes through the perforated mirror 9. The objective lens 14 is placed between the perforated mirror 9 and the subject's eye E, and behind the perforated mirror 9 it passes through and reaches the observation optical system. A photographing lens 15, an optical path splitter such as a guichroic mirror 18 that reflects infrared light and transmits visible light. being jumped. On the reflective side of the guichroic mirror 16, a field lens 19 located at a substantially conjugate position with the film 18, and an image pickup tube 22 having a reflective mirror function for deflecting the optical path are sequentially arranged along the optical axis. Further, on the opposite side of the flip-up mirror 17, a field lens 23 placed in a position conjugate with the film 1B and the field lens 19 in sequence along the optical axis, a pentaprism 24 for deflecting the optical path, a direct view finder 25, An imaging lens 2B, a reflection mirror 27 that deflects the optical path, a fixation chart 28 shown in FIG. 4 that can be moved from the outside in a horizontal plane, and a visible light emitting diode 29 for illuminating the fixation chart are arranged.

In particular, in the embodiment, a flip-up mirror 17, a field lens 23, a pentaprism 24. For the finder section 5, for example, the body section 30 and finder section 31 of a -eye reflex camera are used as they are, and the image forming lens 26,
Reflection mirror 27, fixation chart 28, light emitting diode 2
9 is housed in a separate fixation lamp storage section 32, etc., and this fixation lamp storage section 32 can be connected to the finder section 31. Furthermore, outside the aforementioned optical path, an external fixation lamp 33 is provided that can be turned on at will. Therefore, the tungsten lamp 1 is turned on during monitor observation, and the visible light and infrared light emitted from the tungsten lamp 1 are illuminated. The light including this passes through the condenser lens 2 together with the light beam reflected by the reflection mirror 12 and passes through the visible cut filter 3.
Visible light is removed and only light in the infrared region enters the guichroic mirror 4. Since the guichroic mirror 4 has the property of reflecting infrared light, this light beam consisting of infrared light is reflected by the guichroic mirror 4 and formed into an image on the Lingeslit plate 6 by the condenser lens 5. do. The annular infrared light flux that has passed through the ring slit plate 6 reaches the perforated mirror 9 via the relay lens 7.8, where it is reflected toward the objective lens 14, and the objective lens 14 causes the iris of the eye E to be examined. A ring slit image is formed near Ei to illuminate the fundus Ef. The infrared light emitted from the fundus If and having fundus image information once forms an intermediate image of the fundus Ef by the objective lens r4, and then passes through the hole of the perforated mirror 9, passes through the photographing lens 15, and is reflected by the gou-chroic mirror 16. The reflected light forms a fundus image on a field lens 19 provided at a position substantially optically conjugate with the film 18. The infrared light flux from the field lens 19 is reflected by the reflection mirror 20 and then sent to the imaging tube 2 by the imaging lens 21.
The image is formed on 2. The fundus image projected onto the image pickup tube 22 is monitored using visual conversion means such as a cathode ray tube.

When this fundus camera is used as a non-mydriatic type, the fixation lamp storage section 32 is connected to the finder section 31 and the light emitting diode 29 is turned on. The image of the fixation chart 28 illuminated by this illumination light passes through the reflection mirror 27 and the imaging lens 26, enters the view finder 31, and enters the direct view finder 25, The image is formed in the vicinity of the field lens 23 located at a position conjugate with the film 18 via the pentaprism 24 . Since this fixation chart 28 is in a position conjugate with the position of the fundus Ef with respect to the entire optical system after focusing, the light flux from the fixation chart 28 is directed to the flip-up mirror 17, the gyroic mirror 16, An image is formed on the fundus Ef of the eye E to be examined via the photographing lens 15, the perforated mirror 9, and the objective lens 14.

Therefore, the subject can clearly fixate the image of the fixation chart 28, and his or her line of sight is guided in that direction.

'A. When photographing an image, the strobe tube 10 momentarily emits light, and the visible light that passes through the gicroic mirror'-4 is
The fundus Ef is illuminated with the same optical path as the infrared light for observation mentioned above, and the reflected light from the fundus Ef is reflected by a guichroic mirror 6.
The film 18 passes under the flip-up mirror 17 which was activated to the position shown by the dotted line at the same time as the strobe tube 10 emits light.
image on top.

In addition, when used as a mydriatic fundus camera, 7.
The visible cut filter 3 is removed, the fixation lamp storage section 32 containing the light emitting diode 29 and the like is removed from the finder section 31, and the external fixation lamp 33' is turned on. Then, the examinee's line of sight is guided to the fixation lamp 33, and the fundus Ef is observed with the naked eye through the finder 25 using visible light. Incidentally, the fluoroscopy and lumen photography are exactly the same as in the non-mydriatic case.

In the example, a visible light-emitting diode 29 was used as the light source for the internal fixation lamp, but this was also achieved by using a tungsten lamp, which was guided by a light guide etc. from the tungsten lamp l for bottom observation. There is no problem even if the light is illuminated, and the movement of the internal fixation light and the subject's eye E guided by this fixation light.
In order to match the direction of movement, the optical path between the finder 25 and the fixation chart 28 may be deflected several times using a reflective mirror or the like.

As explained above, the fundus camera system according to the present invention uses a removable internal fixation light for the direct view finder to effectively direct the subject's line of sight while being used as a non-mydriatic fundus camera. In addition, it is possible to block the light from the direct view finder, and when using an external fixation light as a mydriatic fundus camera, the internal fixation light can be removed from the direct view finder to observe the fundus. The camera becomes smaller, which has a big effect on operability.

[Brief explanation of the drawing]

The drawings show an embodiment of the fundus camera system according to the present invention, in which Fig. 1 shows its 1m configuration, Fig. 2 is a plan view of the ring slit plate, Fig. 3 is a plan view of the perforated mirror, and Fig. 4 is the plan view of the ring-slit plate. FIG. 1 is a plan view of a fixation chart. Reference numeral 1 is a tungsten lamp, 3 is a visible cut filter, 4.16 is a gicroic mirror, 6 is a ring slit plate, 9 is a perforated mirror, 10 is a cannon tube, 14
15 is an objective lens, 15 is a photographing lens, 17 is a flip-up mirror, 18 is a film, 22 is an image pickup tube, 24 is a pentaprism, 25 is a direct vision phycedar, 28 is a fixation chart, 2
9 is a light emitting diode, 31 is a finder section, 32 is a fixation lamp storage section, 33 is an external fixation lamp, E is the eye to be examined, and Ef is the fundus. −

Claims (1)

[Claims] 1. An external fixation lamp when used as a mydriatic fundus camera, and an internal fixation lamp that sends light to the subject through a direct view finder when used as a non-mydriatic fundus camera. It is characterized by being equipped with a sight light. fundus camera system. 2. The fundus camera system according to claim 1, wherein the internal fixation lamp is disposed within a fixation lamp housing, and the fixation lamp housing is connected to a direct view finder. 3. The fundus camera system according to claim 1, wherein a single-lens reflex camera finder having a pentaprism is used as the direct view finder.