JP3630795B2 - Ophthalmic imaging equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ophthalmologic photographing apparatus used for observing and photographing an eye to be examined in an ophthalmic hospital or the like.
[0002]
[Prior art]
Conventionally, when observing and photographing the fundus of an eye to be examined with a fundus camera in an ophthalmological hospital, the examiner performs coarse and fine alignment adjustments by manual operation.
[0003]
[Problems to be solved by the invention]
However, manual alignment as in the conventional example requires time for fine adjustment, and is extremely difficult to align. Furthermore, even after the alignment is adjusted to the proper position, correction must be performed every time a deviation from the proper position occurs, especially in the case of fluorescent photography that requires long-time observation photography. It often happens that shooting fails due to the shift. Therefore, since the subject must fix his face and eyes and not move during observation photographing, this results in a great burden on the subject.
[0004]
An object of the present invention is to provide an ophthalmic imaging apparatus with excellent operability that solves the above-described problems, automatically performs fine adjustment of alignment, reduces the burden on the subject, and avoids imaging failure. There is.
[0005]
[Means for Solving the Problems]
Ophthalmic imaging apparatus according to the present invention for achieving the above object, in the ophthalmologic photographing apparatus having an illumination optical system for illuminating the subject's eye, and an observation image taking optical system to observe imaging, imaging of the observation imaging optical system A light amount detecting means for detecting the light amount of a plurality of parts of the eye image obtained by the element and comparing the light amount between the plurality of parts to determine the movement direction of the two optical systems in the vertical and horizontal directions; and the light amount detection characterized by comprising an optical system moving means for moving both the two optical systems in accordance with the determination of the moving direction by means.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail based on the embodiments shown in the drawings.
FIG. 1 is a configuration diagram of a fundus camera according to an embodiment. A measurement unit 3 is placed on a base 1 via a moving mechanism unit 2, and a rough adjustment is performed on an examiner side of the measurement unit 3. An operation rod 4, a fine adjustment start switch 5, a finder 6 and a film box 7 are arranged. An objective lens 8 is disposed in front of the measuring unit 3 so as to face the eye E. On the optical path behind the objective lens 8, a perforated mirror 9, a focusing lens 10, a photographing lens 11, a switching mirror 12, and a film are provided. Boxes 7 are arranged sequentially.
[0008]
On the optical path in the incident direction of the perforated mirror 9, a relay lens 13, a mirror 14, a photographing light source 15, a condenser lens 16, and an observation light source 17 are sequentially arranged. A field lens 18, a half mirror 19, a relay lens 20, a mirror 21, and a finder 6 are sequentially arranged on the optical path in the reflection direction of the switching mirror 12, and a television is disposed on the optical path in the reflection direction of the half mirror 19. A lens 22 and an image sensor 23 are provided, and an output of the image sensor 23 is connected to the image processing unit 24. The base 1 is provided with a determination processing unit 25, and the output of the determination processing unit 25 is connected to the moving mechanism unit 2 and the television monitor 26, and the outputs of the image processing unit 24 and the fine adjustment start switch 5 are the determination processing unit. 25.
[0009]
In use, the light beam emitted from the observation light source 17 passes through the condenser lens 16, the mirror 14, and the relay lens 13, is reflected around the perforated mirror 9, passes through the objective lens 8, the pupil Ep of the eye E, and the fundus oculi Er. Illuminate. The reflected light from the illuminated fundus Er passes through the pupil Ep, the objective lens 8 and the hole of the perforated mirror 9, passes through the focusing lens 10 and the photographing lens 11, is reflected by the switching mirror 12, and is reflected by the field lens. An image is formed in the vicinity of 18. Further, this light beam is reflected by the half mirror 19, and a fundus image is formed on the image sensor of the television camera 23 by the television lens 22.
[0010]
Further, the light beam transmitted through the half mirror 19 is reflected by the mirror 21 and reaches the finder 6, and the examiner performs coarse adjustment using the operation rod 4 while looking through the finder 6. Press the adjustment start switch 5. As a result, the fundus image formed on the image sensor is input to the image processing unit 24, and a fundus image Er ′ as shown in FIG. 2 is displayed on the television monitor 26.
[0011]
At this time, the image processing unit 24 detects the respective light amounts of the areas A to D on the fundus oculi image Er ′ by A / D conversion or the like, and transmits them to the determination processing unit 25. The determination processing unit 25 stores a threshold value in advance, and the light amounts of the areas A to D are compared with the threshold values, and the light amounts of the areas A to D exceeding the threshold value are detected or the light amounts of the areas A to D are detected. Are compared, the moving direction of the measuring unit 3 is determined based on the result, and the measuring unit 3 is moved by the moving mechanism unit 2 to a position where no flare enters. For example, if the amount of light in area A exceeds the threshold and is larger than those in other areas B to D, the measurement unit 3 is moved downward with respect to the eye E. In this manner, the movement mechanism unit 2 can perform vertical and horizontal alignment with the eye E based on the light amount values of the areas A to D.
[0012]
Further, when the light amounts in the areas A to D are increased by substantially equal values, the flare in the areas A to D is minimized while moving the measurement unit 3 in the front-rear direction, so that the eye E Align in the front-rear direction. By repeating such an operation, the optical system can be automatically moved to the optimum position.
[0013]
In addition, for the alignment in the front-rear direction with respect to the eye E, an optical system and a light source for projecting a known index for front-rear direction alignment are provided, and the light amount of the fundus reflection image of the index is detected. The optical system may be moved to a maximum position.
[0014]
Further, when flare removal is difficult by the movement of the measuring unit 3 by the moving mechanism unit 2 as described above, a variable magnification optical system is newly arranged on the photographing optical path, and this is determined by a command from the determination processing unit 25. Alternatively, driving may be performed using a driving unit (not shown), and flare may be removed by changing the photographing magnification.
[0015]
In this embodiment, the image sensor is used for the input of the light amount detecting means, but a plurality of light receiving elements can also be used.
[0016]
【The invention's effect】
As described above, in the ophthalmologic photographing apparatus according to the present invention , alignment is performed by detecting the light amounts of a plurality of parts of the eye image to be examined and moving the illumination optical system and the observation photographing optical system to the optimum positions according to the detection result. Can be finely adjusted automatically, reducing the burden on the subject and avoiding failure of imaging, and can be an easy-to-use apparatus with excellent operability.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an embodiment.
FIG. 2 is an explanatory diagram of a fundus image on an image sensor.
[Explanation of symbols]
2 moving mechanism section 3 measuring section 4 coarse adjustment operation rod 5 fine adjustment start switch 6 finder 7 film box 15 photographing light source 17 observation light source 23 imaging element 24 image processing section 25 judgment processing section 26 television monitor

Claims (4)

An illumination optical system for illuminating the subject's eye, the ophthalmologic photographing apparatus having an observation photographing optical system to observe photographing, detects the amount of multiple sites of the eye image obtained by the image pickup device of the observation imaging optical system the light quantity detecting means for determining the moving direction of the vertical and horizontal of the two optical systems by comparing the amount of light among multiple sites, in response to said determination of the moving direction by the light quantity detecting means both optical systems together An ophthalmologic photographing apparatus comprising: an optical system moving means that moves. The ophthalmologic photographing apparatus according to claim 1, wherein the light amount detection unit compares the light amounts of the plurality of parts with a threshold value . The ophthalmologic photographing apparatus according to claim 1, wherein the plurality of portions for detecting the light amount are peripheral portions of the fundus image at a substantially symmetrical position from the center of the fundus image. The ophthalmologic photographing apparatus according to claim 1, wherein the light amount detecting unit determines a moving direction of the two optical systems in the front-rear direction when the light amounts of the plurality of parts are increased by substantially equal values .

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