JPH07136127A - Fundus imaging device - Google Patents

Abstract

(57) [Summary] [Purpose] A color fundus image is taken using blue, green, and red laser light. [Structure] Laser light from laser light sources 11, 12, and 13 emitting blue, green, and red wavelengths is combined by dichroic mirrors 9 and 10 to scan the fundus Er two-dimensionally, and the reflected light is reflected at each wavelength. Of the light beam of the dichroic mirrors 16, 18 and 20 to split the photoelectric sensor 1
The signal is detected by 9, 20, and 21, and the signal is detected by the signal processor 2
2, and the color fundus image is displayed on the color television monitor 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fundus photographing apparatus used in an ophthalmology clinic or the like.

[0002]

2. Description of the Related Art A fundus imaging apparatus having a conventional scanning optical system irradiates a fundus with a monochromatic laser beam, receives a monochromatic fundus image and displays it on a monochrome television monitor or the like for use in fundus examination. .

[0003]

However, as in the above-mentioned conventional example, in the examination of the fundus state in monochrome, it is not possible to evaluate with a color image, and it is difficult to accurately grasp the state of the affected area. There are things.

An object of the present invention is to take a color fundus image,
An object of the present invention is to provide a fundus imaging apparatus capable of accurate and detailed fundus diagnosis.

[0005]

A fundus photographing apparatus according to the present invention for attaining the above object scans a fundus with a laser light source that emits laser light having wavelengths of blue, green and red. A scanning optical system, a light splitting member that splits the reflected light from the fundus due to the laser light into blue, green, and red wavelengths, and respective light fluxes of blue, green, and red wavelengths split by the light splitting member. And a light receiving optical system including a light receiving element for receiving light.

[0006]

The fundus photographing apparatus having the above-described structure scans the fundus with laser light of three colors of blue, green and red, detects reflected light of three colors from the fundus with the light receiving element, and forms a fundus image in color. Project.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on the illustrated embodiments. FIG. 1 shows a block diagram of the first embodiment. An objective lens 1, a galvano mirror 2, a concave mirror 3, a polygon mirror 4, a perforated mirror 5 functioning as a light splitting member, and a focus lens 6 are arranged on the optical path in front of the eye E to be examined. The exit end of the optical fiber 7 is arranged at the focus position of the focus lens 6, and three types of illumination light sources are provided at the entrance end thereof. That is, from the incident end of the optical fiber 7, the lens 8, the dichroic mirrors 9, 10, the ICG
(Indokanin green) A semiconductor laser light source 11 that emits near-infrared light for fluorescence imaging is arranged. A multimode oscillation argon laser light source 12 is provided on the reflection side of the dichroic mirror 9, and a He—Ne laser light source 13 is provided on the reflection side of the dichroic mirror 10. The polygon mirror 4 that scans in the plane of the paper and the galvano mirror 2 that scans in the plane orthogonal to it are both conjugated with the pupil Ep.

In the reflecting direction of the perforated mirror 5, the mirror 1
4. Focus lens 1 that works with focus lens 6
5. The confocal diaphragm 16 is arranged and is longer than the dichroic mirror 17 that reflects blue light of 488 nm, the dichroic mirror 18 that reflects the green light of 514 nm of the argon laser light source 12, and the green light that passes through the dichroic mirrors 17 and 18. A photoelectric sensor 19 such as an avalanche photodiode, which receives a light flux having a wavelength and is highly sensitive to near infrared light, is arranged. Dichroic mirror 17
A photoelectric sensor 20 such as a photomultiplier having a high sensitivity to blue color is provided on the reflection side of, and a photoelectric sensor 21 is provided on the reflection side of the dichroic mirror 18. The outputs of these photoelectric sensors 19, 20, 21 are connected to a color television monitor 23 via a signal processor 22. The focus lens 6 and the focus lens 15 are linked so that the confocal diaphragm 16 and the emission end of the optical fiber 7 are conjugated with the fundus Er.

In the fundus photographing apparatus having the above-mentioned structure, the light fluxes from the three kinds of illumination light sources 11, 12, and 13 are combined by the dichroic mirrors 8 and 9, and are condensed on the incident end of the optical fiber 7 by the lens 8. It The light flux emitted from the emission end of the optical fiber 7 passes through the focus lens 6, the perforated mirror 5, the polygon mirror 4, the concave mirror 3, the galvano mirror 2 and the objective lens 1 to illuminate the fundus Er of the eye E to be examined. In this irradiation process, the irradiation light is two-dimensionally scanned by the polygon mirror 4 and the galvano mirror 2.

The reflected light from the fundus Er returns through the same optical path, is reflected by the perforated mirror 5, passes through the mirror 14, the focus lens 15, and the confocal diaphragm 16, and is reflected by the dichroic mirror 17 to emit blue light of 488 nm. Received at 20. In addition, the dichroic mirror 18 is 514
The green light of nm is reflected and is received by the photoelectric sensor 21, and the light flux having a wavelength longer than that is received by the photoelectric sensor 19. The received light signals from the photoelectric sensors 19, 20 and 21 are sent to the signal processor 22 and converted into video signals, and a color fundus image Er 'is displayed on the color television monitor 23.

In this case, since blue light with a wavelength of 488 nm from the argon laser light source 12 is used, blue or purple with higher saturation than this cannot be expressed, but the fundus Er
Since such a color does not exist, there is no particular problem in color reproduction.

Fluorescence photography FA using fluorescein
When G is performed, only the blue light from the argon laser light source 12 is illuminated, and the fundus image Er ′ is photographed using the received light signal from the photoelectric sensor 21, so it is necessary to insert and remove the filtration filter as in the conventional example. There is no need to simplify the structure. Also, I
For fluorescence photography using CG, semiconductor laser light source 1
It is necessary to illuminate only the near-infrared light from No. 1 and photograph the fundus image Er ′ using the light reception signal of the photoelectric sensor 20, but in this case, it is necessary to insert a filtration filter in front of the photoelectric sensor 20. .

Furthermore, it is also possible to simultaneously perform fluorescence imaging of FAG and ICG. Both fluorescent agents are intravenously injected into the blood vessel and illuminated with blue light from the argon laser light source 12 and near-infrared light from the semiconductor laser light source 11, and photoelectric sensors 19 and 21.
It is sufficient to store the received light signals by and display them on two television monitors at the same time or on one television monitor one after another.

FIG. 2 shows the configuration of the light source section of the second embodiment, and FIG. 3 shows the configuration of the light receiving section thereof. The light source section is composed of light sources 24 to 27 that emit four types of light fluxes, and has a wavelength of 48 used for the blue channel for color photography and for FAG fluorescence photography.
Semiconductor laser light source 2 that emits blue light of 0 to 490 nm
4 is coupled to the optical path by the dichroic mirror 28,
Light source 2 that emits He-Ne laser light that emits green light, etc.
5 is coupled to the optical path by the dichroic mirror 29,
A semiconductor laser light source 26 that emits red light is coupled to the optical path by a dichroic mirror 30. Further, a semiconductor laser light source 27 that emits near-infrared light is arranged on the optical axis in the transmission direction of the dichroic mirrors 28, 29, 30.

On the other hand, the light receiving portion is composed of photoelectric sensors 31 to 34, and the photoelectric sensors 3 which receive blue light in the reflection directions of the dichroic mirrors 35, 36 and 37, respectively.
1, a photoelectric sensor 32 for receiving green light, a photoelectric sensor 33 for receiving red light are provided, and a photoelectric sensor 34 for receiving near infrared light is further provided in the transmission direction of the dichroic mirrors 35, 36, 37. There is.

The light source section is connected to the focus lens 6 via the optical fiber 7, and the light receiving section is connected to the focus lens 15 via the confocal diaphragm 16 as in the first embodiment. is there.

The measurement is carried out in the same manner as in the first embodiment, and at the time of color photographing, the luminous flux of each color of the laser light sources 24, 25 and 26 is used to synthesize a color image from the light receiving signals of the photoelectric sensors 31, 32 and 33. At this time, the semiconductor laser light source 2
It is also possible to synthesize information of four colors including 7 and display a similar color image, or it is possible to separately display only the image by the near infrared light as a single color image.

Therefore, the ICG emits four colors of laser light.
When a blood vessel that has been intravenously injected is photographed, a color image and an ICG fluorescence image can be photographed at the same time. It is also possible to obtain a reflected fundus image of a single laser light illumination as in the conventional device.

[0019]

As described above, the fundus photographing apparatus according to the present invention scans the fundus with laser light of three colors of blue, green, and red, and the reflected light thereof is an optimal photoelectric sensor suitable for each wavelength. By receiving the light and displaying the fundus image, it is possible to capture a more useful fundus image for diagnosis.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment.

FIG. 2 is a configuration diagram of a light source unit according to a second embodiment.

FIG. 3 is a configuration diagram of a light receiving unit according to a second embodiment.

[Explanation of symbols]

2 Galvano mirror 4 Polygon mirror 7 Optical fiber 11, 12, 13, 24, 25, 26, 27 Laser light source 19, 20, 21, 31, 32, 33, 34 Photoelectric sensor 22 Signal processor 23 Color television monitor

Claims (2)

[Claims] 1. A laser light source that emits laser light having wavelengths of blue, green, and red, a scanning optical system that scans the fundus with the laser light, and light reflected from the fundus by the laser light is blue, green, and red. Fundus imaging apparatus having a light splitting member for splitting into wavelengths of 1 and 2 and a light receiving optical system including a light receiving element for receiving light beams of respective wavelengths of blue, green, and red split by the light splitting member. . 2. The fundus imaging apparatus according to claim 1, wherein each of the light receiving elements is selectively used in accordance with an imaging mode.