JPH11197114A - Eyeground camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily oberve and photograph eyegrounds in respective modes by inserting respective exciters and barrier filters into an optical path while appropriately switching the observation with an eyepiece lens and a black-and- white camera and the photographing in a color and black-and-white when a color mode, visible fluorescent mode and infrared fluorescent mode are selected. SOLUTION: When a color mode select switch is selected, filters F1-F4 are separated from respective optical paths, a return mirror M5 is inserted into the optical path, and the mode is switched to the observation due to a eyepiece lens 13 and the photographing due to a color camera 23. When a visible fluorescent mode select switch is selected, return mirrors M5 and M6 are inserted into the optical path, and the mode is switched to the observation due to the eyepiece lens 13 and the photographing due to a black-and-white camera 25. When an infrared fluorescent mode selected switch is selected, the return mirror M5 is separated from the optical path, the return mirror is inserted into the optical path, and the mode is switched to the observation and photographing due to the black-and-white camera 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fundus camera, and more specifically, to irradiate light from an observation light source and a photographing light source to the fundus of an eye to be examined through an illumination optical system, and reflects light reflected from the fundus. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fundus camera capable of forming an image through an imaging optical system and observing or photographing the fundus and capable of performing fluorescence imaging.

[0002]

2. Description of the Related Art In a conventional fundus camera, a normal fundus is photographed in color through a color camera (color mode), or a fluorescent agent is injected intravenously to photograph the fundus with visible fluorescence (visible fluorescence mode). ) Or taking an image of the fundus with infrared fluorescence (infrared fluorescence mode). In this case, in the visible fluorescence mode, an image is captured by inserting an exciter filter and a barrier filter for visible fluorescence into the optical path, while in the infrared fluorescence mode, an exciter filter and a barrier filter for infrared fluorescence are inserted into the optical path. In the case of the color mode, all the filters are separated from the optical path to perform the color photographing.

[0003]

In the above-mentioned conventional fundus cameras, when performing visible or infrared fluorescence imaging, respectively, the necessary filters are manually inserted or removed, or the visible fluorescence exciter filter and the red The setting of each photographing mode was performed by detecting the insertion of the external fluorescence exciter filter.

However, conventionally, the switching of the optical path of the observation system and the switching of the optical path of the photographing system have been performed manually, so that it has been troublesome to switch each mode. Conventionally, if at least one of the exciter filter or the barrier filter is not inserted in the optical path, the fluorescence mode cannot be detected, and an erroneous photographing will be performed if both are out of the optical path by mistake. There was fear. In addition, in the conventional method, it is necessary to insert and remove the filters for both the exciter and the barrier for visible fluorescence, and to insert and remove the filters for both the exciter and the barrier for infrared fluorescence. There is a disadvantage that. Further, in the related art, there is a problem that an exciter filter or a barrier filter is erroneously inserted into an optical path during color photographing.

It is an object of the present invention to provide a fundus camera capable of easily switching among a color mode, a visible fluorescent mode, and an infrared fluorescent mode, in which the above problems are eliminated.

[0006]

According to the present invention, in order to solve this problem, light from an observation light source and a photographing light source is radiated to the fundus of an eye to be examined via an illumination optical system, and reflected from the fundus. In a fundus camera capable of fluorescent imaging for observing or photographing the fundus by imaging light through an imaging optical system, an exciter filter for visible fluorescence, a barrier filter for visible fluorescence, and an exciter filter for infrared fluorescence, Infrared fluorescence barrier filter, eyepiece for observing the fundus, color camera for photographing the fundus in color, black-and-white camera for observing or photographing the fundus in black and white, observing with the eyepiece and monochrome camera Means for switching between observations by a camera, means for switching between shooting with a color camera and shooting with a black-and-white camera, color mode and visible fluorescent mode Means for selecting an infrared fluorescent mode, when the color mode is selected, switching between observation with an eyepiece and shooting with a color camera, and an exciter filter and a barrier filter for the visible fluorescence for color shooting When the exciter filter and the barrier filter for infrared fluorescence are separated from the optical path and the visible fluorescence mode is selected,
While switching to observation with an eyepiece and shooting with a black-and-white camera, the exciter filter and barrier filter for the visible fluorescence are inserted into the optical path for visible fluorescence shooting, and when the infrared fluorescent mode is selected, the black-and-white camera is used. A configuration is adopted in which the mode is switched between observation and photography by a black-and-white camera, and the infrared fluorescence exciter filter and the barrier filter are inserted into the optical path for infrared fluorescence photography.

In such a configuration, switching to each mode can be performed with one touch, and fundus observation and fundus photographing in each mode can be easily performed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. FIG. 1 shows a fundus camera according to the present invention. A lamp LA as an observation light source is disposed at the center of the mirror M1, and light emitted from the lamp LA passes through a condenser lens 1, a strobe SR as an imaging light source, a condenser lens 2, a filter F1, and then a total reflection mirror. Reflected by M2, followed by a lens 3, a ring slit 4 to form a ring illumination,
Further, the light passes through a relay lens 5, a black spot plate 6 for taking a reflection of the objective lens, and a relay lens 7, is reflected by a total reflection mirror M3 having a hole at the center, is reflected by an objective lens 8, passes through the objective lens 8, and then passes through the objective lens 8. The light enters the fundus Er from the pupil Ep.

The filter F1 is an exciter filter for visible fluorescence that passes a blue band wavelength, and is inserted into the optical path only in the visible fluorescent mode, and is inserted into the optical path in the color mode and the infrared fluorescent mode. Entry is prohibited. In the case of the infrared fluorescent mode, 700 to 8
An infrared fluorescence exciter filter F3 for passing infrared light in a band of 00 nm is inserted into the optical path. The filter F3 is prohibited from entering the optical path in the color mode and in the visible fluorescent mode.

The reflected light from the fundus Er is received again from the pupil Ep via the objective lens 8, and the perforated total reflection mirror M
The light passes through the filter F2, the focusing lens 9, and the imaging lens 10 through the hole 3 and enters the mirror M4.

The filter F2 is a barrier filter for visible fluorescence that passes a wavelength in the green band, and is inserted into the optical path only in the visible fluorescent mode, and enters the optical path in the color mode and the infrared fluorescent mode. Entry is prohibited. In the case of the infrared fluorescence mode, 800 to 1
A barrier filter F4 for infrared fluorescence that allows infrared light of 000 nm to pass therethrough is inserted into the optical path. This filter F
Reference numeral 4 denotes that entry into the optical path is prohibited in the color mode and in the visible fluorescent mode.

Next, the light incident on the mirror M4 is reflected by the mirror M4 and the return mirror M5 during observation, and is observed by the examiner S through the field stop 11 and the field lens 12 by the eyepiece 13. Return mirror M5
Is configured to be able to be removed from the optical path. When performing fundus photography, the return mirror M5 is removed from the optical path,
The flash SR serving as a light source for photographing emits light, and the fundus image enters the field stop 20 and the field lens 21. When performing color photography, the return mirror M6 is detached from the optical path, the fundus photography is performed by the color camera 23 through the lens 22, and when performing monochrome photography, the return mirror M6 is inserted into the optical path. Then, through a lens 24, a black-and-white camera 25 performs fundus photography. In the infrared fluorescent mode, observation is also performed by the monochrome camera 25.

FIG. 2 shows a mechanism for inserting and removing the mirrors M5 and M6 and the filters F1 to F4 in the optical path. The control circuit 40 includes a filter F1 driving circuit 41, a filter F2 driving circuit 42, The filters F1 to F4 are inserted into and removed from the optical path via the filter F3 drive circuit 43 and the filter F4 drive circuit 44, respectively. Further, the control circuit 40 causes the mirrors M5 and M6 to be inserted into and removed from the optical path via the mirror M5 driving circuit 55 and the mirror M6 driving circuit 56. The operation panel 28 as shown in FIG. 3 is connected to the control circuit 40. The operation panel includes a color mode selection switch 30, a visible fluorescence mode selection switch (FAG) 31, and an infrared fluorescence mode selection switch (IC
G) 32, a timer switch 33, an exciter switch 34, and a barrier switch 35 are arranged. The circles shown on the left side of each switch are display lamps that are turned on when the switch is operated.

Next, the operation of the fundus camera configured as described above will be described with reference to the flow of FIG. First, step S
In step 1, any one of the mode selection switches 30, 31, 32 is operated to select a mode. When the color mode selection switch 30 is operated, the color mode is selected. In step S2, the filters F1 to F4 are separated from the respective optical paths via the driving circuits 41 to 44, and the return mirror M5 is connected via the driving circuits 55 and 56. Is inserted into the optical path, and the return mirror M6 is separated from the optical path. Thereby, the observation by the eyepiece 13 and the color camera 23
Can be switched to shooting.

The examiner S determines in step S3 the eyepiece 13
Observes the fundus, performs alignment and focusing, and presses a shooting button (not shown).
5 is removed from the optical path (step S4), and the strobe light S
When R is turned on, a color fundus image is captured by the color camera 23 and recorded by a continuous video recorder or a still video recorder (not shown) (step S5).
At this time, if the exciter switch 34 and the barrier switch 35 do not function, erroneous operation can be prevented.

A visible fluorescent mode selection switch (FA)
G) If 31 is selected, the return mirror M5 is inserted into the optical path via the drive circuits 55 and 56 in step S11, and the return mirror M6 is also inserted into the optical path. Thereby, the observation is switched to the observation by the eyepiece 13 and the imaging by the monochrome camera 25. In step S12, the operation of the exciter switch 34 or the barrier switch 35 is awaited. In this case, when the switch 31 is turned on, the switches 34 and 35 have a function of inserting and removing the filters F1 and F2 for visible fluorescence.

In step S12, switch 34 or 3
5 without operating any of the filters (the filters F1 and F2 are not inserted into the optical path) or operating one of the switches (either the filters F1 and F2 are inserted into the optical path), the examiner S Eyepiece 1 in step S13
Observation is performed by 3 and alignment and focusing are performed.

After the alignment and focusing are completed, the timer switch 33 is operated at the same time as the start of the intravenous injection of the fluorescent agent in step S14 to start time counting by the timer in the control circuit (step S15). It is determined whether F1 and F2 have been inserted. This can be done, for example, by detecting the position of each filter or by the switch 3 in step S12.
The monitoring is performed by monitoring the operation states of 4, 35. If neither filter F1 or F2 is inserted, both filters are inserted in step S17, and if either one is inserted, an uninserted filter is inserted in step S18.

In this way, the two-visible fluorescence filter F
1. With the F2 inserted, the photographing button is pressed to start the visible fluorescence photographing. At this time, the return mirror M5 separates from the optical path, the visible fluorescent fundus image is captured by the monochrome camera 25, and recorded by a continuous video recorder or a still video recorder (not shown) (step S1).
9). In this mode, in step S12, the filter F1,
Even when one or both of the F2s are not input into the optical path, both filters are automatically inserted into the optical path at the time of imaging, so that erroneous imaging is prevented.

Further, an infrared fluorescence mode selection switch (IC
G) If 32 is selected, the return mirror M5 is separated from the optical path via the drive circuits 55 and 56 in step S21, and the return mirror M6 is inserted into the optical path. As a result, the mode is switched between observation by the monochrome camera 25 and shooting by the monochrome camera 25. In step S22, operation of the exciter switch 34 or the barrier switch 35 is awaited. In this case, when the switch 32 is turned on, the switches 34 and 35 have a function of inserting and removing the filters F3 and F4 for infrared fluorescence.

In step S22, switch 34 or 3
The examiner S does not operate any of the filters 5 (the filters F3 and F4 are not inserted into the optical path) or operates one of the switches (the filters F3 and F4 are inserted into the optical path). Black and white camera 2 in step S23
The alignment and focus are performed while viewing the fundus image output by 5 on a monitor (not shown) or the like.

When the alignment and focusing are completed, the timer switch 33 is operated at the same time as the start of the intravenous injection of the fluorescent agent in step S24 to start time counting by the timer in the control circuit (step S25). It is determined whether F3 and F4 have been inserted. This can be done, for example, by detecting the position of each filter or by using the switch 3 in step S22.
The monitoring is performed by monitoring the operation states of 4, 35. If neither filter F3 or F4 is inserted, both filters are inserted in step S27, and if either one is inserted, an uninserted filter is inserted in step S28.

In this manner, the dual infrared fluorescent filter F
3. With the F4 inserted, the photographing button is pressed to start infrared fluorescence photographing. At this time, the infrared fluorescent fundus image is captured by the monochrome camera 25 and recorded by a continuous video recorder or a still video recorder (not shown) (step S29). In this mode, both filters are automatically inserted into the optical path at the time of shooting even if one or both of the filters F3 and F4 are not input into the optical path in step S22.
Erroneous photographing is prevented.

[0024]

As described above, according to the present invention, when the color mode is selected, the observation is switched between the observation with the eyepiece and the imaging with the color camera, and the exciter filter and the barrier filter for visible and infrared fluorescence are switched. When the camera is removed and the visible fluorescent mode is selected, the mode is switched to observation with an eyepiece and shooting with a black-and-white camera, an exciter filter and a barrier filter for visible fluorescent light are inserted into the optical path, and further, an infrared fluorescent mode is selected. Is switched to observation and photography with a black-and-white camera, and an exciter filter and a barrier filter for infrared fluorescence are inserted into the optical path, so that switching to each mode can be performed with one touch, and fundus observation and fundus observation in each mode can be easily performed. Shooting becomes possible.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a configuration of an optical system of a fundus camera according to the present invention.

FIG. 2 is a block diagram illustrating a driving mechanism of a filter and a mirror.

FIG. 3 is an explanatory diagram showing a configuration of an operation panel.

FIG. 4 is a flowchart showing a flow of an operation in each mode.

[Explanation of symbols]

 LA Lamp SR Strobe F1 Exciter Filter for Visible Fluorescence F2 Barrier Filter for Visible Fluorescence F3 Exciter Filter for Infrared Fluorescence F4 Barrier Filter for Infrared Fluorescence 13 Eyepiece 23 Color Camera 25 Monochrome Camera 30 Color Mode Selection Switch 31 Visible Fluorescence Mode Selection Switch 31 32 Infrared fluorescence mode selection switch

Claims (5)

[Claims] An illumination light system irradiates light from an observation light source and an imaging light source to a fundus of an eye to be examined, and forms a reflected light from the fundus through an imaging optical system to observe the fundus. Or, in a fundus camera capable of taking fluorescence images, an exciter filter for visible fluorescence, a barrier filter for visible fluorescence, an exciter filter for infrared fluorescence, a barrier filter for infrared fluorescence, and an eyepiece for observing the fundus A color camera for photographing the fundus in color, a black-and-white camera for observing or photographing the fundus in black and white, means for switching between observation with an eyepiece and a black-and-white camera, photographing with a color camera and photographing with a black-and-white camera Switching means, and means for selecting a color mode, a visible fluorescence mode, and an infrared fluorescence mode. When the mode is selected, the mode is switched to observation with an eyepiece and shooting with a color camera, and the exciter filter and barrier filter for visible fluorescence and the exciter filter and barrier filter for infrared fluorescence are switched for color shooting. When separated from the optical path and the visible fluorescent mode is selected, the mode is switched between observation with an eyepiece and imaging with a black-and-white camera, and the exciter filter and the barrier filter for the visible fluorescent light are inserted into the optical path for visible fluorescent imaging. When the infrared fluorescent mode is selected, the mode is switched between observation with a black-and-white camera and shooting with a black-and-white camera, and the infrared fluorescent exciter filter and barrier filter are inserted into the optical path for infrared fluorescent shooting. Eyes characterized by Bottom camera. 2. When the visible fluorescence mode is selected,
The fundus camera according to claim 1, wherein both the exciter filter for visible fluorescence and the barrier filter are detached from the optical path or one of them is inserted into the optical path to perform observation with an eyepiece. 3. When the infrared fluorescence mode is selected,
The fundus camera according to claim 1, wherein both the exciter filter for infrared fluorescence and the barrier filter are detached from the optical path or one of them is inserted into the optical path and observation is performed by a monochrome camera. 4. A switch for inserting / removing an exciter filter and a switch for inserting / removing a barrier filter are provided. When the visible fluorescent mode is selected, the exciter filter and the barrier filter for visible fluorescent light are switched by the switch, and The fundus camera according to claim 1, wherein when the fluorescence mode is selected, the exciter filter and the barrier filter for infrared fluorescence can be inserted and removed by the switch. 5. The fundus camera according to claim 4, wherein the switches are not operated when the color mode is selected.