JPH07171107A - Ophthalmic equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] A lens system is used to downsize the device and suppress aberrations for accurate and clear wide-angle fundus photography. [Structure] A light beam from a laser light source 1 passes through a focus lens 2, a diaphragm 3, a perforated mirror 4, a relay lens 5, a polygon mirror 6, a relay lens 7, a galvanometer mirror 8 and an objective lens 9 to a fundus Er of an eye E to be examined. Illuminate. The reflected light returns through the same optical path, is reflected by the perforated mirror 4, and the diaphragm 1
Light is received by the photoelectric sensor 17 through the focus lens 15, the confocal diaphragm 16 and the confocal diaphragm 16. In this case, the relay lens 5,
7 is slightly decentered, and the reflected light from the polygon mirror 6 and the galvano mirror 8 is excluded from the optical path for fundus photography.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmologic apparatus used in an ophthalmic hospital or the like.

[0002]

2. Description of the Related Art Since an ophthalmologic apparatus having a conventional confocal optical system is mainly composed of a mirror system, the entire optical path is bent, the apparatus becomes large, and the photographing angle of view can be increased. There is a problem in practice because it cannot be done.

On the other hand, there has been proposed an ophthalmologic apparatus which tilts an objective lens to eliminate reflected light outside the optical path to photograph a fundus.

[0004]

[Problems to be Solved by the Invention]

(1) When the objective optical system is a lens, in the case of intense myopia, the reflected light of the objective lens mixes into the light receiving system, and clear fundus photography is not possible.

(2) When the objective lens is tilted, a large tilt angle causes a great amount of aberration, and accurate and clear fundus photography cannot be performed.

It is a first object of the present invention to provide an ophthalmologic apparatus which can be downsized by using a lens system and can be used for wide-angle photography.

A second object is to provide an ophthalmologic apparatus capable of taking clear fundus photography regardless of the diopter of the eye to be examined.

[0008]

The ophthalmologic apparatus of the first invention according to the present invention for achieving the above object projects a light beam onto an eye to be examined through a scanning optical system and receives reflected light from the eye to be examined. In the ophthalmologic apparatus described above, a relay lens for forming a pupil image of the eye to be inspected on the scanning reflection member is provided, and at least one of the relay lenses is decentered or inclined.

The ophthalmologic apparatus of the second invention is an ophthalmologic apparatus that projects a light beam onto an eye to be inspected through a scanning optical system and receives reflected light from the eye to be inspected, and forms a pupil image of the eye to be inspected on a scanning reflection member. It is characterized in that it has an objective lens for forming an image and a correction lens which is provided between the eye to be inspected and the objective lens so as to be freely inserted and removed.

[0010]

In the ophthalmologic apparatus of the first invention having the above-mentioned structure, when the light beam from the laser light source is applied to the eye to be inspected through the relay lens and the scanning optical system and the reflected light from the eye is received by the photoelectric sensor. In addition, the relay lens is tilted or decentered to eliminate reflected light from the scanning optical system, and the fundus or the like is photographed.

The ophthalmologic apparatus of the second invention inserts a correction lens between the eye to be inspected and the objective lens to suppress the generation of reflected light from the objective lens and photograph the fundus and the like.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on the illustrated embodiments. FIG. 1 shows a configuration diagram of the first embodiment, in which a focus lens 2, a diaphragm 3 having a small aperture, a perforated mirror 4, an optical path are provided on an optical axis O1 in an optical path from a laser light source 1 to an eye E to be examined. A relay lens 5 having an optical axis O2 slightly decentered from the axis O1 and a polygon mirror 6 for scanning a light beam in the plane of the drawing are arranged. On the optical axis O3 in the reflection direction of the polygon mirror 6, as shown in FIG. 2, a relay lens 7 having an optical axis O4 slightly decentered in the direction perpendicular to the paper surface with respect to the optical axis O3, a light beam in a direction orthogonal to the paper surface A scanning galvanometer mirror 8 is disposed, and an objective lens 9 and a correction lens 10 including a concave lens are disposed on an optical axis O5 in the reflection direction of the galvanometer mirror 8. One end of the correction lens 10 is fixed to the rod 11, and the other end of the rod 11 is connected to the hinge 12 so that the correction lens 10 can be inserted and removed and always exits outside the optical path O5. In FIG. 1, the optical axis O4 of the relay lens 7 is drawn eccentrically in the plane of the drawing for convenience of explanation.

In the optical path O6 in the reflection direction of the perforated mirror 4,
A diaphragm 13 having an opening 13a as shown in FIG. 3 and a light-shielding portion 13b conjugate with the opening of the diaphragm 3 at the center thereof, and used interchangeably or in combination with the diaphragm 13, and as shown in FIG. A diaphragm 14 having an opening 14a off the axis O6,
A focus lens 15 that works in conjunction with the focus lens 2,
The confocal diaphragm 16 and the photoelectric sensor 17 are arranged. The focus lenses 2 and 15 adjust their positions in conjunction with each other, and make the laser light source 1 and the confocal diaphragm 16 conjugate with the fundus Er of the subject's eye E to form a so-called confocal optical system. The output of the photoelectric sensor 17 is connected to the television monitor 19 via the signal processor 18.

In the above structure, when the laser light source 1 is operated, the light beam from the laser light source 1 advances on the optical axis O1, and the focus lens 2, diaphragm 3, perforated mirror 4, relay lens 5 and polygon mirror 6 are used. Scanned in one direction,
The galvano mirror 8 scans in the other direction through the relay lens 7 on the optical axis O3, and the fundus Er of the eye E to be examined is two-dimensionally scanned through the objective lens 9 on the optical axis O5 to illuminate.
The reflected light from the fundus Er returns to the same optical path, and the perforated mirror 4
Is reflected by the diaphragm 13 and the focus lens 1 on the optical path 06.
5, the light passes through the confocal diaphragm 16 and is received by the photoelectric sensor 17. This received light signal is converted into an image signal by the signal processor 18, and a fundus image Er ′ is displayed on the television monitor 19.

The images of the diaphragm 3 and the diaphragm 13 are imaged on the polygon mirror 6 by the relay lens 5, then on the galvano mirror 8 by the relay lens 7, and again formed on the pupil Ep of the eye E by the objective lens 9. To be imaged. The diaphragm 13 is configured as shown in FIG. 3 so as to receive the light flux photographed in the central portion of the pupil Ep from the peripheral portion thereof. Also, aperture 1
4 is eccentric as shown in FIG.

Also, the optical axis O2 of the relay lens 5 is the light beam optical axis.
Due to the eccentricity with O1, the reflected light from the relay lens 5 deviates from the optical axis O1 and does not reach the photoelectric sensor 17.
Further, as shown in FIG. 2, since the optical axis O4 of the relay lens 7 is eccentric with the luminous flux optical axis O3, the reflected light thereof is also the optical axis O3.
Get out of. That is, the dotted line P in FIG. 2 indicates the position where the light beam strikes, and since the light beam is sufficiently thin in the direction perpendicular to the paper surface, it is possible to remove the reflected light even with a slight eccentricity.

The same effect can be obtained by tilting the relay lens 7 instead of decentering the relay lens 7. When the relay lens 7 is composed of a plurality of lenses, it suffices to decenter a part where reflection is a problem. Furthermore, if the perforated mirror 4 is brought close to the polygon mirror 6, the relay lens 5 may not be used.

The reflection of the objective lens 9 causes a problem when the eye E to be examined has strong myopia. Therefore, the correction lens 1
By inserting a concave lens into the optical path O5 as 0, the fundus
The Er conjugate point can be moved away from the objective lens 9 to eliminate the occurrence of reflection. Further, since the correction lens 10 is located very close to the pupil Ep, the reflection of the correction lens 10 itself is blocked by the diaphragm 13 and the confocal diaphragm 16 and the photoelectric sensor 17 is provided.
Will never be reached.

FIG. 5 is a block diagram of the second embodiment. Figure 5
A slit light source 20, a focus lens 21, a vibrator 22, a focus lens 23, a slit diaphragm 24, and a photoelectric array sensor 25 are arranged on the optical path O7 that extends upward and the optical path O8 that extends downward. A mirror 26 and a perforated mirror 27 are orthogonally attached to the vibrator 22, and the vibrator 22 is a slit light source 20.
It acts to scan the light flux from. On the optical path O9, which is the reflection direction of the mirror 26 and the incidence direction of the perforated mirror 27, the objective lens 28 and the correction lens 29 are directed toward the eye E to be inspected.
Are arranged.

The focus lenses 21 and 23 move together to make the slit light source 20 and the slit diaphragm 24 conjugate with the fundus Er. The mirror 26 and the perforated mirror 27 are kept conjugate with the pupil Ep of the eye E by the objective lens 28. The correction lens 29 is used in the same state as that of the correction lens 10 in FIG. 1 in the case of strong myopia, prevents reflection of the objective lens 28 from entering the photoelectric array sensor 25, and retracts out of the optical path when not in use.

In the above structure, the light flux from the slit light source 20 passes through the focus lens 21, is reflected by the mirror 26, and illuminates the fundus Er of the eye E through the objective lens 28. The reflected light from the fundus Er returns through the same optical path, is reflected by the perforated mirror 27, passes through the focus lens 23 and the slit diaphragm 24, and reaches the photoelectric array sensor 25 in which elements are arranged perpendicularly to the paper surface. The signal processing and display are the same as in the first embodiment of FIG.

[0022]

As described above, the ophthalmologic apparatus according to the first aspect of the present invention uses the lens system to downsize the apparatus, enable wide-angle photography, and slightly tilt or decenter the lens. Thus, reflected light can be excluded from the optical path, and accurate and clear fundus photography that is not affected by aberration can be performed.

In the ophthalmologic apparatus of the second invention, by inserting a correction lens between the eye to be inspected and the objective lens, generation of reflected light from the objective lens is suppressed, and accurate and clear fundus imaging even in the case of myopia. To enable.

[Brief description of drawings]

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

FIG. 2 is a front view of a relay lens.

FIG. 3 is a front view of a diaphragm.

FIG. 4 is a front view of a diaphragm.

FIG. 5 is a configuration diagram of a second embodiment.

[Explanation of symbols]

 1, 20 Laser light source 3, 13, 14, 24 Aperture 4, 27 Perforated mirror 5, 7 Relay lens 6 Polygon mirror 8 Galvano mirror 9, 28 Objective lens 10, 29 Correction lens 17 Photoelectric sensor 25 Photoelectric sensor array 26 Mirror

Claims (2)

[Claims] 1. An ophthalmologic apparatus which projects a light beam onto an eye to be inspected through a scanning optical system and receives reflected light from the eye to be inspected,
An ophthalmologic apparatus comprising a relay lens for forming a pupil image of an eye to be inspected on a scanning reflection member, and at least one of the relay lenses is eccentric or inclined. 2. An ophthalmologic apparatus which projects a light beam onto an eye to be inspected through a scanning optical system and receives reflected light from the eye to be inspected,
An ophthalmologic apparatus comprising: an objective lens for forming a pupil image of an eye to be inspected on a scanning reflection member; and a correction lens that is provided between the eye to be inspected and the objective lens so as to be freely inserted and removed.