JPH05245109A - Eyeground camera - Google Patents

Abstract

PURPOSE:To enable the execution of both of binocular photographing and monocular photographing with one unit of apparatus. CONSTITUTION:A lens 2, a ring slit 3, a lens 4, a bored mirror 5 having a hole part at its center and an objective lens 6 are provided on an optical path O arriving at an eye E to be examined from a light source 1. A diaphragm 7, lenses 8, 9, a quick return mirror 10 to be sprung upward and a monocular cameral 11 are provided behind the bored mirror 5. And then, the quick return mirror 13, stereoscopic camera 14 are provided in the reflecting direction of the quick return mirror 10. The monocular photographing of the eyeground is executed by the monocular camera 11 when the quick return mirror 10 is sprung upward. The binocular photographing is executed by a stereoscopic camera 14 when the quick return mirror 10 is down and a ring slit 3 and a split prism 17 are respectively exchanged with a binocular diaphragm 19 and a two-hole aperture 20 and the light source 1 is triggered to emit light.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fundus camera widely used in ophthalmology clinics and the like.

[0002]

2. Description of the Related Art When a fundus examination is performed and a stereoscopic photograph of the fundus is required, conventionally, a patient moves to a stereoscopic fundus camera to take another fundus photograph. In addition, since fundus photographing and anterior segment photographing have different types of illumination optical systems, if photographing is performed with one fundus camera, the illumination becomes non-uniform and the imaging becomes unclear.

[0003]

However, the need for a dedicated fundus camera for each photographing means in this way is not only inconvenient for patients and examiners, but also economically unfavorable. ..

An object of the present invention is to solve the above-mentioned drawbacks and to provide a fundus camera capable of photographing a plurality of types of eyes to be inspected with a single apparatus.

[0005]

A fundus camera according to a first aspect of the present invention for achieving the above object comprises a binocular image pickup means and a monocular image pickup means, and a switching means for switching between the two image pickup means. It is what

A fundus camera according to a second aspect of the present invention for achieving the above object has a light blocking member for blocking a light beam on the optical axis at a position substantially conjugate with the anterior segment of the eye to be examined, It is characterized in that it has a switching means for inserting and removing from the optical axis.

[0007]

In the fundus camera having the above-mentioned structure, the fundus camera is set by the switching means so as to be most suitable for the measuring means selected by the examiner.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on the illustrated embodiments. FIG. 1 is a block diagram of the first embodiment. On the optical path O1 from the light source 1 to the eye E to be inspected, the lens 2 and the pupil of the eye E to be inspected
A ring slit 3 having a ring-shaped slit as shown in FIG. 2 which is substantially conjugate with Ep, a lens 4, and a pupil Ep which is substantially conjugate with FIG.
A perforated mirror 5 having a horizontally long hole 5a as shown in FIG.
The objective lenses 6 are sequentially arranged, and on the optical path O2 behind the perforated mirror 5, a diaphragm 7, lenses 8 and 9, and a flip-up mirror 10 which is flipped up at the time of monocular photographing are arranged. It has reached 11.

In the reflection direction of the flip-up mirror 10, a view-finder is formed together with a view-finder lens 12, and the flip-up mirror 13 is retracted out of the optical path at the time of photographing, 90 ° in FIG.
A stereo camera 14 drawn in a rotated state is provided. The stereo camera 14 includes a relay lens 16, a split prism 17 that splits an optical path into two right and left, and a mirror that guides two light beams to the film 15 from the object side so that two images having different viewing angles can be projected on the film 15. 18, 18 'are provided. In addition, the ring slit 3 and the diaphragm 7 are provided with a binocular diaphragm 19 having upper and lower openings as shown in FIG. 4 and two lateral openings as shown in FIG. It is configured to be replaced with the two-hole diaphragm 20 that it has.

When the alignment with respect to the eye E is completed, fundus imaging is performed. During monocular photography, the flip-up mirror 10 is flipped up and arranged at the position of the broken line, and the ring slit 3 and the diaphragm 7 are inserted in the optical path. The light flux emitted from the light source 1 passes through the optical paths O1 and O2 and the monocular camera 11
Taken by.

During binocular photography, the flip-up mirror 10 descends and is placed at the position indicated by the solid line, and the flip-up mirror 13 flips up to the position indicated by the broken line. Instead of the ring slit 3 and the aperture 7, the binocular aperture 19 and the two-hole aperture, respectively. The aperture 20 is O in the optical path
1, inserted in O2. Reflected light from the fundus of the eye is flipped up by a mirror 10
Is reflected by the split prism 17 and split by the split prism 17 to be recorded on the film 15 as two images having different viewing angles.

FIG. 6 is a block diagram of an example in which the finder portion is improved to binocular observation. The flip-up mirror 13 is arranged at the position indicated by the solid line, and the lens 22,
Split prism 23, two mirrors 24, 24 ', left and right 2
A viewfinder having two eyepieces 25, 25 'is arranged. In this case, the examiner can observe a stereoscopic image because the right and left eyes have different viewing angles.

FIG. 7 is a block diagram of the second embodiment.
In this embodiment, the monocular camera 11 is replaced with a video stereo camera 27. Video stereo camera 27
On the optical path O3 from the front, the field lens 28, the mirror 29, the relay lens 30, the split prism 31 for splitting the optical path into two, and the left and right mirrors 32, 32'C.
CD elements 33 and 33 'are sequentially provided. In addition,
The field lens 28 is adapted to project the image of the pupil Ep on the split prism 31. CCD element 33, 33 '
The image obtained by can be displayed on a display or analyzed by a computer.

FIG. 8 is an explanatory view when a lattice pattern is projected on the fundus Er of the eye E to be examined. If a mechanism for projecting a lattice pattern on the fundus Er is incorporated in the illumination optical system, the corresponding points of the left and right images will become clear and can be effectively used for computer analysis.

FIG. 9 is a front view of the two-hole mirror 34. The two-hole mirror 34 is used as a substitute for the perforated mirror 5, and is provided with two circular openings 35 for monocular photography and an oval opening 36 for binocular photography. The two-hole mirror 34 is slid according to the photographing means, and either one of the circular opening 35 and the oval opening 36 is appropriately used so as to be arranged on the optical axis. By switching the aperture, it is possible to suppress uneven exposure during monocular photography.

FIG. 10 is a block diagram of the third embodiment. A mask 38, a field lens 39, a relay lens 40, a prism block 41 composed of four prisms, and an image sensor 42 are sequentially arranged from the front on the optical path O4 from the eye E to be inspected.
The image of the pupil Ep is projected on the front surface of the, and the relay lens 40 is also configured to project the fundus image on the image sensor 42. With such a configuration, since two left and right fundus images are formed on one image pickup element 42, a plurality of image pickup elements are not required and the apparatus can be manufactured at low cost.

FIG. 11 is a block diagram of the fourth embodiment in which the slit used in the fundus camera is devised. A lens 52, a turret 53, a lens 54, and a perforated mirror 5 are provided on the optical path O6 from the light source 51 such as a strobe or a lamp to the eye E to be inspected.
5, an objective lens 56 is disposed, a pair of diaphragms 57 is provided behind the perforated mirror 55, and a diopter conversion lens 58 having a diopter of about 20 to 30D is inserted between the diaphragms 57 and is insertable and removable. , A lens 59, and a film 60 are sequentially arranged. The turret 53 is provided at the pupil conjugate point P, and the light source 51
The turret 53 and the hole 55a of the perforated mirror 55 are arranged substantially conjugate with the eye Ep to be inspected.

The turret 53 has four kinds of diaphragms and filters as shown in FIG. 12, and is rotated around a rotary shaft 61. An opening 53a used for photographing the anterior segment of the eye and a transillumination used for diagnosing a cataract. A polarizing plate 53b for photographing and two large and small diaphragms 53c, 53d for photographing the fundus of the eye are provided. The compound diaphragm 53c is arranged before and after the ring slits 53c 'and 53d' at the conjugate position of the pupil Ep and the ring slits 53c 'and 53d', and two light shields having a diameter smaller than the inner diameters of the ring slits 53c 'and 53d'. It is composed of plates 53c "and 53d" and is three-dimensionally assembled coaxially.

FIG. 13 is a block diagram of the system. Selection switches 65 to 6 according to the imaging purpose of the eye E to be inspected
Input shooting conditions from 7. The controller 68 determines the optimal light emission conditions for these conditions, and the fundus camera body 69
Is configured to control. During fundus photography, the turret 53 is rotated about the rotation axis so that the compound diaphragm 53c is arranged on the optical path O6, and the diopter conversion lens 58 is retracted to the outside of the optical path. When the light source 51 is turned on, a ring-shaped light flux enters the eye E to be inspected from the pupil Ep, and the fundus Er is illuminated. The reflected light from the fundus of the eye is the objective lens 56 and the hole 55 of the perforated mirror 55.
An image is formed by forming an image on the film 60 through a, the diaphragm 57, and the lens 59.

FIG. 14 is an explanatory diagram of the illumination luminous flux emitted from the objective lens 56. At the composite diaphragm conjugate position Q, the diameter depends on the ring slit 53c 'or 53d', and the length is the shading plate 5.
There is a rhombus shadow R depending on 3c "or 53d". At the time of fundus imaging, imaging is performed in a state where the composite diaphragm conjugate position Q overlaps the pupil Ep. At the time of photographing the anterior segment, the shadow R makes the illumination of the anterior segment uneven, which is not suitable for photographing. Then, the turret 53 is rotated and the opening 53a is arranged on the optical path O6 so that the shadow R
Is set to the minimum state before shooting. At this time, the diopter conversion lens 58 is inserted to move the conjugate point on the film 60 from the fundus Er to the anterior segment.

The diopter conversion lens 58 may be one, and in this case, it is preferable that the diopter conversion lens 58 be inserted as close as possible to the diaphragm 57. Also,
The film 60 is not limited to the film, and a CCD device, a stereoscopic camera, or the like may be used without any problem.

[0022]

As described above, the fundus camera according to the present invention can perform binocular photography and monocular photography with one instrument, is convenient and saves time, and can photograph even anterior ocular segment without uneven illumination. ..

[Brief description of drawings]

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

FIG. 2 is a front view of a ring slit.

FIG. 3 is a front view of a perforated mirror.

FIG. 4 is a front view of a binocular diaphragm.

FIG. 5 is a front view of a two-hole diaphragm.

FIG. 6 is a configuration diagram of a binocular viewfinder.

FIG. 7 is a configuration diagram of a second embodiment.

FIG. 8 is an explanatory diagram of a fundus image.

FIG. 9 is a front view of a two-hole mirror.

FIG. 10 is a configuration diagram of a third embodiment.

FIG. 11 is a configuration diagram of a fourth embodiment.

FIG. 12 is a front view of a turret.

FIG. 13 is a system block configuration diagram.

FIG. 14 is an explanatory diagram of an illumination light flux.

[Explanation of symbols]

 1, 51 light source 3 ring slit 5, 55 perforated mirror 10 flip-up mirror 11 monocular camera 14 stereo camera 15, 60 film 17 split prism 53 turret 53c compound diaphragm 53c ', 53d' ring slit 53c ", 53d" shading plate P Pupil conjugate point

Claims (2)

[Claims] 1. A fundus camera having a binocular image pickup means and a monocular image pickup means, and a switching means for switching between the two image pickup means. 2. A light-shielding member for shielding a light beam on the optical axis at a position substantially conjugate with the anterior segment of the eye to be inspected, and a switching means for inserting and removing the light-shielding member from the optical axis. Fundus camera to do.