JP3697001B2 - Ophthalmic equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ophthalmologic apparatus used for photographing the fundus of an eye to be examined in an ophthalmic clinic or the like.
[0002]
[Prior art]
Conventionally, a fixation lamp of a fundus camera is provided with an optical system branched from the photographing optical system, a target as a fixation target is arranged in the optical system, and the target is illuminated from behind to illuminate the eye to be examined. It is projected on the fundus.
[0003]
[Problems to be solved by the invention]
However, in the above-described conventional example, a large space is required to branch the optical path of the optical system in which the fixation target is arranged, and there is a problem that the entire optical system becomes large and the operability of the ophthalmic apparatus is impaired. Since a complicated mechanism is required by using the optical path switching mirror for branching, the apparatus becomes expensive and the risk of failure increases. On the other hand, when the optical path switching mirror is not used, expensive parts such as a wavelength division mirror and a half mirror must be used, which causes a problem that the product price increases.
[0004]
An object of the present invention is to provide an ophthalmic apparatus capable of solving the above-described problems and presenting a fixation target without forming a branched optical path.
[0005]
[Means for Solving the Problems]
Ophthalmologic apparatus according to the present invention for achieving the above object, illuminates an imaging optical system for imaging the eye, an optical member arranged in the image pickup optical system in the optical path, the optical member from the side A light source, and the optical member is provided with a diffuse reflection region on a surface opposite to the eye to be examined with respect to the optical path .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail based on the embodiments shown in the drawings.
FIG. 1 shows a configuration diagram of the fundus camera of the embodiment. On the optical path of the fundus illumination optical system A, an observation light source 1 that emits steady light, such as a halogen lamp, a condenser lens 2, infrared light is transmitted and visible light is transmitted. A filter 3, a light source 4 for photographing such as a strobe, a lens 5, a diaphragm 6 having a ring-shaped opening, a relay lens 7, a diaphragm 8 having a ring-shaped opening, and a perforated mirror 9 having a central opening. Has been.
[0008]
Further, on the optical path of the fundus photographing optical system B, there are an objective lens 10, a perforated mirror 9, a focus lens 11 for adjusting the focus by changing the position on the optical axis, a photographing lens 12, and a still image pickup device 13. They are arranged sequentially. A switching mirror 14 that branches the fundus image from the photographing optical system B is disposed between the photographing lens 12 and the image sensor 13. A lens 15 and a mirror are disposed on the optical path of the observation optical system C from the switching mirror 14. 16, a lens 17 and an image sensor 18 are sequentially arranged.
[0009]
An anterior segment illumination light source 19 is disposed in the vicinity of the objective lens 10, and an anterior segment observation optical system D is disposed between the objective lens 10 and the perforated mirror 9. In this anterior ocular segment observation optical system D, a lens 20, a target member 21 having a scattering region to be a fixation target 21a, an optical member having an image split prism 22 in the center, and a lens 23 are arranged, and the target member An illumination light source 24 that illuminates the visual target member 21 from the side is arranged in the vicinity of 21, and these members can be inserted into and removed from the optical path of the photographing optical system B as a unit.
[0010]
2 shows a front view of the target member 21, FIG. 3 shows a side view, and the fixation target 21a corrodes the center of the glass plate with the chemical in the shape of the target and embeds white paint as a diffusion member therein. The objective lens 10 and the lens 20 are arranged at a position substantially conjugate with the fundus of the eye E to be examined. In addition, the prism 22 is located at a position that is substantially conjugate with the anterior eye portion of the eye E when the working distance between the eye E and the objective lens 10 (working distance) becomes appropriate with respect to the objective lens 10 and the lens 20. Has been placed.
[0011]
Outputs of the image sensors 13 and 18 are connected to an image processing unit 25, and outputs of the image processing unit 25 are connected to a television monitor 26, an image memory 27, and a control unit 28. The output of the control unit 28 is connected to the anterior ocular segment observation optical system D and the imaging light source 4, and the outputs of the observation site selection switch 29 and imaging switch 30 are connected to the control unit 28.
[0012]
In such a configuration, the photographer does not show normal means (not shown) so that the optical axis of the photographing optical system B passes through the center of the pupil of the eye E and the cornea of the objective lens 10 and the eye E is kept at an appropriate distance. Thus, the optical system and the eye E are aligned while observing the anterior segment. That is, in the anterior ocular segment observation state, the anterior ocular segment observation optical system D is inserted in the imaging optical path, and the light emitted from the anterior ocular segment illumination light source 19 is the eyelid of the eye E and its surroundings, the iris Illuminate the anterior segment of the sclera.
[0013]
The illuminated anterior ocular segment image passes through the objective lens 10, the lens 20, and the target member 21, and once forms an image in the vicinity of the prism 22. The prism 22 separates the anterior ocular segment image, and the lens 23 and the hole are formed. It passes through the opening of the mirror 9, the focus lens 11, and the photographic lens 12, is reflected upward by the switching mirror 14, forms an image again in the vicinity of the lens 15, passes through the lens 15, and is reflected leftward by the mirror 16. As a result, an image is formed near the image sensor 18. The anterior segment image is converted into a video signal by the image sensor 18, input to the image processing unit 25, and displayed on the television monitor 26.
[0014]
Since the prism 22 is disposed at a position where the anterior segment image is formed when the working distance is appropriate, when the working distance is not appropriate, the upper and lower anterior segment images are shifted left and right as shown in FIG. Although the images are shifted, the upper and lower sides of the anterior segment image coincide with each other as shown in FIG. Also, on the surface of the prism 22 opposite to the prism surface, a target that serves as a reference for alignment of the eye E and serves as a reference for a pupil diameter that can be photographed is printed. This visual target passes through the same optical path as that of the anterior segment image and is formed in the vicinity of the image sensor 18 and is displayed on the television monitor 26 as the visual target image T together with the anterior segment image as shown in FIGS. Is done. As shown in FIG. 1, by disposing the lens 23 away from the reference target member 21, the anterior segment image can be enlarged and formed, and more accurate alignment is possible. Become.
[0015]
At this time, the subject visually recognizes the fixation target 21a, and the light emitted from the illumination light source 24 illuminates the visual target member 21 from the side and proceeds inside the visual target member 21 to fix the fixation target. 21a, is diffused and reflected by the fixation target 21a, and is projected onto the fundus of the eye E through the surface of the target member 21 on the side where the fixation target 21a is not present, the lens 20, and the objective lens 10.
[0016]
If the peripheral portion of the visual target member 21, that is, the edge portion, is not a polished surface, but a rough polished surface such as polished glass, the entire diffused surface becomes a secondary light source, and the fixation target 21 a becomes brighter and uniform. Can be illuminated. Moreover, it is possible to illuminate even more brightly by providing a plurality of light sources around the target member 21 instead of one light source.
[0017]
By forming the fixation target 21a on the surface of the optotype member 21 opposite to the eye E to be examined, the light reflected by the inner surface of the optotype member 21 effectively illuminates the fixation target 21a. The fixation target 21a can be presented brighter. Further, by using the fixation target 21 a together with the prism 22, the light flux of the fixation target 21 a image formed on the anterior segment image is deflected by the prism 22, so that the shadow of the fixation target 21 a is reflected on the television monitor 26. It can prevent reflection.
[0018]
In this way, when the observation region selection switch 29 is operated after the alignment of the eye E and the objective lens 10 is completed, the control unit 28 turns off the anterior segment illumination light source 19 and the anterior segment observation optical system D. Is moved out of the optical path, and the observation light source 1 is turned on to switch to the fundus observation state.
[0019]
The light emitted from the observation light source 1 is collected by the condenser lens 2, and the visible light is blocked by the filter 3, and passes through the strobe light source 4, the lens 5, the aperture 6 aperture, the relay lens 7, and the aperture 8 aperture. Then, it is reflected leftward by the mirror part around the perforated mirror 9, passes through the objective lens 10, and illuminates the fundus from the pupil of the eye E to be examined. The fundus image illuminated in this way again passes through the pupil, the objective lens 10, the hole of the perforated mirror 9, the focus lens 11 and the photographing lens 12, is reflected upward by the switching mirror 14, passes through the lens 15 and passes through the mirror 16. Is reflected to the left by the lens 17 and forms an image on the image sensor 18 by the lens 17.
[0020]
This image is converted into a video signal in the same manner as the anterior segment image, and is displayed on the television monitor 26 through the image processing unit 25. The photographer observes the fundus image reflected on the television monitor 26, confirms that the photographing region, the presence / absence of flare, the focus state, etc. are appropriate, and proceeds to the photographing operation.
[0021]
When the examiner operates the photographing switch 30, the control unit 28 retracts the switching mirror 14 out of the optical path, the image sensor 13 starts light accumulation for still image photographing, and the photographing light source 4 emits light at the same time. The light emitted from the imaging light source 4 passes through the lens 5 and then illuminates the fundus through the same optical path as the observation light. The illuminated fundus image passes through the objective lens 10, the aperture of the perforated mirror 9, the focus lens 11, and the photographing lens 12, and forms a still image on the image sensor 13. The still image is converted into a digital signal, stored in the image memory 27 via the image processing unit 25, and reproduced on the television monitor 26.
[0022]
In the above-described embodiment, the illumination light source 24 that illuminates the fixation target 21a is fixed to the anterior ocular segment observation optical system D, and is configured to be inserted into and removed from the imaging optical path together with the anterior ocular segment observation optical system D. Then, the electric wire for supplying current to the illumination light source 19 is connected to the anterior ocular segment observation optical system D which is a movable part, and moving the anterior ocular segment observation optical system D may cause problems such as disconnection. is there.
[0023]
Accordingly, the illumination light source 24 is fixed to the housing that supports the photographing optical system B, not the anterior ocular segment observation optical system D, and is turned on in conjunction with the insertion of the anterior ocular segment observation optical system D into the optical path. The indicator member 21 is illuminated from the side. In this way, the electric wire does not restrict the movement of the movable part, and the fear of disconnection can be avoided. At this time, when the distance between the light source 24 and the target member 12 is long and sufficient light quantity cannot be obtained, one end of a fiber (not shown) is fixed to the target member 21 and the other end is near the light source 24. The light may be guided from the light source 24 to the side surface of the visual target member 21 through the fiber. In this way, since the fiber is inserted and removed together with the target member 21 when configured, there is no possibility of blocking the optical path during photographing.
[0024]
The present invention can be applied not only to a fundus camera but also to other ophthalmologic apparatuses such as a tonometer, a refractometer, and a keratometer.
[0025]
【The invention's effect】
Above ophthalmologic apparatus according to the present invention as described, it is not necessary to form a branched light path for presenting a fixation target, without using a complicated structure or expensive components, inexpensive and easy operations In addition, since it is possible to provide a simple fundus camera and it is not necessary to dispose a branch member in the optical path, the degree of freedom of component placement is increased.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a fundus camera of an embodiment.
FIG. 2 is a front view of a target member.
FIG. 3 is a side view.
FIG. 4 is an explanatory diagram of an anterior ocular segment observation image.
FIG. 5 is an explanatory diagram of an anterior ocular segment observation image.
[Explanation of symbols]
1, 4, 19, 24 Light source 3 Filter 6, 8 Ring-shaped aperture stop 13, 18 Image sensor 21 Target member 22 Prism 25 Image processing unit 26 Television monitor 27 Image memory 28 Control unit 29, 30 Switch

Claims (5)

An imaging optical system for imaging the eye, and the optical members disposed in the optical path of the imaging optical system, and a light source for illuminating the optical member from the side, the optical member onto the eye relates to the optical path An ophthalmic apparatus characterized in that a diffuse reflection region is provided on the opposite surface . The ophthalmic apparatus according to claim 1, wherein the diffuse reflection region is formed by attaching a diffusion member to one surface of the plate-like optical member .   The ophthalmic apparatus according to claim 1, wherein a side surface of the optical member is a diffusion surface. The removably arranged an optical member in the photographing optical system, ophthalmic device of claim 1, the light source is arranged and fixed against the imaging optical system. Ophthalmologic apparatus according to claim 4 in which the light was guided by the light guide member fixed to said removably optical element from the light source.

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