JPH11267104A - Retinal camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To take fluorescent photography of eyegrounds observing the circulation of fluorescence by infrared positioning. SOLUTION: When a photographing shutter 16 is depressed, fluorescent filters 5 and 8 are inserted into an optical path and a strobe light source 4 emits light to take a fluorescent image by a color video camera 12, which is stored once into a memory means 14. The signal thus obtained undergoes a thin-out computation to make a smaller screen signal, which is overlapped on a video signal with a black and white video camera 11. As a result, a still eyeground image is displayed on a smaller screen S of a TV monitor 15. In this manner, an animated eyeground image R by infrared rays is displayed on the TV monitor 15 simultaneously with the fluorescent still fundus image on the minor screen S.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fundus camera used in an ophthalmic hospital.

[0002]

2. Description of the Related Art Conventionally, a fundus camera that performs positioning using infrared light and performs photographing with a fluorescent fundus so that a patient is not dazzled is known.

[0003]

However, in the above-mentioned conventional example, since it is impossible to take an image while observing the state of circulation of the fluorescent light at the time of photographing the fluorescent fundus, it is troublesome to take an appropriate image of the fundus and retake the image. Is a problem.

An object of the present invention is to solve the above-mentioned problems,
It is an object of the present invention to provide a fundus camera that performs fundus fluorescence imaging while observing the state of fluorescence circulation while performing alignment with infrared light.

[0005]

A fundus camera according to the present invention for achieving the above object illuminates the fundus with a continuous light source, takes an image with a video camera, displays a moving image fundus image on a television monitor, and displays the position. In the fundus camera to match,
An imaging unit for illuminating a fundus image by illuminating with a flash light source is provided, and the fundus image by the imaging unit is displayed as a small screen on the television monitor displaying the moving image fundus image after the imaging.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiment. FIG. 1 shows a configuration diagram of a fundus camera according to an embodiment. A lens 3 and a strobe light source 4 for emitting flash light for photographing are provided on an optical path from an infrared light source 1 for illuminating the fundus to an objective lens 2 during alignment observation. , Fluorescence excitation filter 5,
A lens 6 and a perforated mirror 7 are sequentially arranged. On the optical path on the right side of the perforated mirror 7, a fluorescent filter 8, an imaging lens 9, and a switching mirror 10 are arranged. On the optical path divided by the switching mirror 10, a black-and-white video sensitive to infrared light is provided. A camera 11 and a color video camera 12, which is an imaging means having sensitivity to visible light, are provided.

The output of the black-and-white video camera 11 is supplied to a signal processing means 1 including an operation control circuit, a frame memory, and an arithmetic circuit.
The output of the color video camera 12 is connected to a signal processing means 13 and a storage means 14 which is a frame memory. The output of the signal processing means 13 is connected to a television monitor 15, and the signal processing means 13
The output of an operation stick 17 having a photographing shutter 16 on the upper side, and the output of an operation switch 20 having a switch 18 for setting a fluorescent photographing mode and a switch 19 for setting a reflected light photographing mode are connected to each other.

The luminous flux from the infrared light source 1 passes through the lens 3, the strobe light source 4, the fluorescence excitation filter 5, and the lens 6, is reflected on the reflection surface of the perforated mirror 7, passes through the objective lens 2, and passes through the objective lens 2 Light the fundus. The reflected light or fluorescent light from the fundus passes through the objective lens 2, the hole of the perforated mirror 7, the fluorescent filter 8, and the imaging lens 9, is reflected by the switching mirror 10 during observation, and is transmitted to the monochrome video camera 11 by infrared light. To form a fundus image.

At the time of photographing, the switching mirror 10 jumps up in the direction of the arrow, and forms a fundus image by visible light on the color video camera 12. The signal processing means 13 displays the video signals of the two video cameras 11 and 12 individually or in combination on the television monitor 15, and the storage means 14 records the photographed fundus image.

When the fluorescent photographing mode setting switch 18 of the operation switch 20 is pressed, the fluorescent photographing mode is selected. At the time of observation, the fundus image illuminated by the infrared light source 1 is picked up by the black-and-white video camera 11 and is displayed on the television monitor 15. Displays a moving image fundus image R as shown in FIG. Further, a fluorescent mode display M and a time display T after the injection of the fluorescent light are displayed on the television monitor 15, so that the examiner can confirm that the fluorescent mode is set.

When the photographing shutter 16 is pressed, the fluorescent filters 5 and 8 are inserted into the optical paths, the switching mirror 10 jumps up, the strobe light source 4 emits light, and a fluorescent image is picked up by the color video camera 12, and the signal is stored in the storage means. 14 temporarily. This signal is thinned out to be a small screen signal, superimposed on the video signal of the black and white video camera 11, and a still image fundus image is displayed on the small screen S of the television monitor 15. After the flash light source 4 emits light, the fluorescent filters 5 and 8 are automatically separated from the optical path. In this manner, the moving image fundus image R by infrared light and the fluorescent still image fundus image on the small screen S are simultaneously displayed on the television monitor 15.

The examiner determines the circulating state of the fluorescent light and the proper state of the photographed image based on the fluorescent image of the small screen S, and if there is no problem, immediately checks the positioning state by looking at the moving image fundus image R. Take a picture. When the next photographing is completed, the fluorescent image of the previous small screen S is automatically replaced with the fluorescent image taken next, and the second fluorescent image is displayed on the small screen S. In the fluorescence imaging, one image is taken every one to two seconds at the beginning of the circulation of the fluorescence. However, since both the fluorescence image and the moving image for positioning are displayed, the circulation state of the fluorescence is observed. You can shoot without missing the timing.

When the reflected light photographing mode is selected by pressing the reflected light photographing mode setting switch 19, the fluorescent filters 5, 8 are kept out of the optical path, the strobe light source 4 emits light, and the fundus image is formed by the color video camera 12. It is imaged. After this video signal is stored in the storage means 14, the video monitor 15 replaces the moving image fundus image R of the monochrome video camera 11.
Is displayed as a still image over the entire screen. The examiner can accurately judge whether or not the image has been properly captured by looking at the still image fundus image. Then, the next shooting is performed by switching the screen of the television monitor 15 to the moving image of the monochrome video camera 11. In the case of reflected light imaging, since the imaging can be performed with an interval between the imagings, the fundus image by the reflected light imaging is displayed on the entire screen on the premise of this screen switching operation, and the determination of the suitability of the captured image is always easy to see. It can be performed.

A still image by reflected light imaging may be displayed on a small screen S. In this case, the small screen S is replaced with a new screen when the next imaging is performed. Further, a switch is provided to erase the small screen S and display only the moving image fundus image R, and the screen of the television monitor 15 is appropriately switched. It may be possible to select whether to switch the whole.

[0015]

As described above, the fundus camera according to the present invention performs photographing by displaying the fundus image picked up by the flash light source on the small screen of the television monitor on which the moving image fundus image of the continuous light source is displayed. After confirming the appropriate state of the fundus image, the next photographing can be performed immediately. In the case of performing fluorescent photographing by observing with infrared light, photographing can be performed while observing the circulation state of fluorescence.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a fundus camera according to an embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Infrared light source 4 Strobe light source 5 Fluorescence excitation filter 8 Fluorescence filtration filter 11 Black-and-white video camera 12 Color video camera 13 Signal processing means 14 Storage means 15 Television monitor 17 Operation stick 20 Operation switch

Claims (1)

[Claims] 1. A fundus camera for illuminating a fundus with a continuous light source, capturing an image with a video camera, displaying a moving image fundus image on a television monitor and aligning the image, and imaging means for illuminating a fundus image with a flash light source. A fundus camera, wherein the fundus image by the imaging means is displayed as a small screen on the television monitor that displays the moving image fundus image after imaging.