JPH07171106A - Opthalmologic photographing device - Google Patents

Abstract

PURPOSE:To photograph an eyeground image capable of easily performing the vertical or lateral identification of the image. CONSTITUTION:The luminous flux emitted from an observing light source 1 advances in the optical path of a lighting optical system and reaches a testee eye E, and the reflected light is returned back in the optical path, passed through a hole in the center of a bored mirror 12, reflected by a switching mirror 16, and photographed by an infrared television camera 21 to project an eyeground image Ef' on a television monitor 22. A photographing switch 23 is pressed to drive a light source control part 26 by the output of a function control part 25, and a light is emitted from a photographing light source 4 to photograph the eyeground Ef. A solenoid 27 and a direct-acting solenoid 28 are driven to control the insertion and extract of quartz baffle plates 7, 7a, cornea baffle plates 11, 11a and a lighting diaphragm 9 having a notch on a part of the opening part onto the optical path. When the lighting diaphragm 9 is inserted to the optical path to perform the photographing, a notch 9b for vertical and lateral identification is photographed on the regulating eyeground image.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmologic photographing apparatus capable of photographing a small pupil diameter of a fundus of an eye to be examined.

[0002]

2. Description of the Related Art Conventionally, a fundus camera has a ring slit plate disposed in a position substantially conjugate with an iris of an eye to be examined in a fundus illumination optical path.
A baffle plate that blocks unnecessary light is provided at a position approximately conjugate with the cornea and lens of the eye to be inspected, and the inner diameter of the ring slit plate and the baffle plate of the ring slit plate are fixed while the outer diameter dimension of the ring slit plate is fixed when photographing a small pupil diameter. It has a switching mechanism for changing the outer diameter and has a structure for switching between the ring slit plate and the baffle plate based on the small pupil diameter photographing signal.

Further, in order to avoid the influence of flare caused by the expansion of the illumination optical path, an illumination diaphragm is inserted in the fundus illumination optical path on the basis of the small pupil diameter photographing signal.

[0004]

However, in the above-mentioned conventional example, since the image of the illumination diaphragm inserted in the illumination optical path on the recording medium is projected together with the fundus image, it is arranged in the vicinity of the recording medium and the left and right sides of the eye to be inspected. There is a problem in that the mask, which is used for both the above-mentioned identification and the upper and lower identification of the recording medium, is covered, and the above-mentioned identification becomes difficult.

The object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide an ophthalmologic imaging apparatus capable of easily identifying the top, bottom, left or right of a fundus image.

[0006]

An ophthalmic photographing apparatus according to the present invention for achieving the above-mentioned object, an illuminating means for illuminating a fundus of an eye to be examined, and an imaging for photographing a fundus image illuminated by the illuminating means. Means and insertion means for inserting a diaphragm for limiting the photographing irradiation range into the optical path during photographing, and the diaphragm is provided with a discrimination means for discriminating the direction of the fundus image.

[0007]

In the fundus photographing apparatus having this structure, the diaphragm for limiting the photographing irradiation range is inserted into the optical path, and the diaphragm is provided with the discriminating means in order to discriminate the direction of the fundus image for photographing the fundus.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on the illustrated embodiments. In FIG. 1, an observation light source 1 such as a halogen lamp
In the optical path from the eye to the subject's eye E, the infrared filter 2, which has a characteristic of transmitting most of the near-infrared light without transmitting visible light,
Condenser lens 3, light source 4 for photographing such as xenon discharge tube, condenser lens 5, ring slit plate 6, crystalline lens baffle plates 7 and 7a, relay lens 8, illumination diaphragm that can be inserted into the optical path by limiting the illumination range of the photographing light. A perforated mirror 12 and an objective lens 13 are arranged through an illumination optical system including a relay lens 10, a corneal baffle plate 11, and 11a.

The photographing light source 4 is arranged substantially conjugate with the observation light source 1 with respect to the condenser lens 3. The ring slit plate 6 relates to the condenser lens 5 and the photographing light source 4
And the pupil of the eye E to be inspected. The perforated mirror 12 is substantially conjugate with the ring slit plate 6 with respect to the relay lenses 8 and 10, and is also substantially conjugate with the cornea Ec of the eye E to be examined with respect to the objective lens 13. The baffle plates 7 and 7a are on-axis light-shielding plates that are provided in conjugation with the position of the cornea Ec of the eye to be inspected E on the crystalline lens side where the ring slit image is formed, and the corneal baffle plates 11 and 11a are similarly the cornea Ec. It is an on-axis light-shielding plate provided so as to be conjugate with the side position.

On the other hand, behind the perforated mirror 12, a focus lens 14, a photographing lens group 15, a switching mirror 16, a mask 17, a shutter (not shown) and a photographing film 18 are sequentially arranged along the optical axis. The switching mirror 16 is located at the solid line position during observation of the fundus, but is switched to the dotted line position during photography.

Further, on the reflection side of the switching mirror 16, an imaging lens 20 and an infrared television camera 21 are arranged next to the field lens 19 placed at a position substantially conjugate with the photographing film 18 with respect to the switching mirror 16, and the infrared television camera. The output of 21 is connected to a television monitor 22.

A photographing switch 2 including a push button switch and the like.
The output of 3 is connected to the function control unit 25 together with the output of the small pupil diameter photography selection input unit 24. Function control unit 25
The output from the light source control unit 2 drives the light source 4 for photographing.
6, lens baffle plate 7, 7a and corneal baffle plate 11,
It is connected to a solenoid 27 that drives 11a, a direct-acting solenoid 28 that drives the illumination diaphragm 9, and a solenoid 29 that drives the switching mirror 16.

With the above structure, the light flux emitted from the observation light source 1 is transmitted through the infrared filter 2, condenser lens 3,
The light source for photography 4, the condenser lens 5, the ring slit plate 6, the lens baffle plates 7 and 7a, the relay lens 8, the relay lens 10, and the corneal baffle plates 11 and 11a pass through the illumination optical system and are guided to the perforated mirror 12. , Objective lens 1
Then, the eye E is irradiated with the light from 3. The reflected light from the fundus Ef of the eye E to be examined returns to the reverse optical path, passes through the objective lens 13, the perforated mirror 12, the focus lens 14, the photographing lens group 15, and is reflected by the switching mirror 16 to be reflected by the field lens 1
9. The fundus image Ef 'which is imaged on the imaging surface of the infrared television camera 21 by the imaging lens 20 and visualized on the television monitor 22 is displayed and observed by the examiner.

The fundus photographing is started by pressing the photographing switch 23, and the output thereof is input to the function control unit 25 together with the output of the small pupil diameter photographing selection input unit 24. Function control unit 25
Drives the solenoid 29 to switch the switching mirror 16 to the dotted line position, the light source control unit 26 causes the photographing light source 4 to emit light, and follows the same optical path as the observation light described above, and the fundus of the eye E to be examined.
Reach Ef. The reflected light from the fundus Ef returns through the same optical path in reverse, passes through the mask 17 via the perforated mirror 12, the photographing lens group 15, etc., and the fundus image Ef ′ is photographed by the photographing film 18. At this time, the function controller 25 drives the solenoid 27 to drive the lens baffle plates 7 and 7a and the corneal baffle plate 1.
The insertion / removal of 1 and 11a into the optical path is controlled, the linear solenoid 28 is driven, and the insertion / removal of the illumination diaphragm 9 into the optical path is controlled.

The illumination diaphragm 9 for limiting the illumination range of the photographing light is
The opening 9 is made of a material that is opaque to the photographing illumination light and has a central portion through which the photographing illumination light passes, as shown in FIG.
A and a notch 9b for identifying the direction of the diaphragm 9 are provided in an oblique direction. Further, when the illumination diaphragm 9 is inserted in the illumination optical path, it is arranged at a position substantially conjugate with the fundus oculi Ef via the relay lens 10, the perforated mirror 12, the objective lens 13, etc., and works in conjunction with the focus lens 14. By moving in the optical axis direction, it is possible to correct the collapse of the conjugate relationship due to the difference in refractive power of the eye E to be inspected.

FIG. 2 is a front view of the drive mechanism of the illumination diaphragm 9, and FIG. 3 is a plan view thereof. The illumination diaphragm 9 is structured to move between a solid line and a chain line around the axis 30, and the armature 28a and the pin. The solenoid 31 is connected to the direct acting solenoid 28 by the pin 31, and the pin 31 penetrates the elongated hole of the solenoid mounting plate 32. A compression spring 33, a spring receiver 34, a spacer 35, and an illumination diaphragm pressing plate 36 are passed through the armature 28a, and are prevented from coming off by a pin 31 press-fitted into a hole of the armature 28a. Further, a spring 37 is provided for absorbing a shock when the illumination diaphragm 9 contacts the stopper 38.

FIG. 4 shows the case of performing normal fundus photography as shown in FIG.
Shows a fundus image Ef 'on the television monitor 22 when the image corresponding to the small pupil diameter is taken. In FIG. 4, the mask 1
The direction of the fundus image Ef 'can be discriminated by the notch 17a provided in 7 and the notch 9 provided in the illumination diaphragm 9 in FIG.
The direction can be discriminated by b.

FIG. 6 is an explanatory view of the second embodiment, in which a small opening 39b is provided in the vicinity of the opening 39a of the illumination diaphragm 39 as a direction identifying means. Also in the third embodiment shown in FIG. 7, an inwardly projecting portion 40b is provided as an identification means in a part of the opening 40a of the illumination diaphragm 40.

In the above-described present embodiment, an illumination diaphragm having various openings can be inserted and removed in the illumination optical path to limit the photographing irradiation range. However, the fourth embodiment shown in FIG. , An illumination diaphragm member 41a composed of two members,
The openings 41c may be narrowed as shown in FIG. 9 by sliding 41b in the direction of the arrow. In these cases, the notch 41d for identifying the direction may be provided in one of the illumination diaphragms.

It is also possible to limit the illumination range by forming the above-mentioned pattern with liquid crystal or the like. Further, although the illumination diaphragm is arranged in the illumination optical path in the present embodiment, the illumination diaphragm may be arranged in the vicinity of the mask 17 near the photographing film 18 so that it can be inserted and removed freely, and the opening of the mask 17 itself is formed as a first portion. ~ It is also possible to change as in the third embodiment.

[0021]

As described above, in the ophthalmologic photographing apparatus according to the present invention, the illumination diaphragm for limiting the photographing range is provided with the discriminating means for discriminating the direction of the fundus image. The direction can be easily identified,
It is possible to take photographs that contribute to accurate ophthalmic diagnosis.

[Brief description of drawings]

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

FIG. 2 is a front view of a drive mechanism of an illumination diaphragm.

FIG. 3 is a plan view of a driving mechanism of an illumination diaphragm.

FIG. 4 is an explanatory diagram of a fundus image during normal shooting.

FIG. 5 is an explanatory diagram of a fundus image at the time of photographing a small pupil diameter.

FIG. 6 is a front view of an illumination diaphragm according to a second embodiment.

FIG. 7 is a front view of an illumination diaphragm according to a third embodiment.

FIG. 8 is a front view of an illumination diaphragm according to a fourth embodiment.

FIG. 9 is an explanatory diagram showing a state in which the illumination diaphragms have been moved.

[Explanation of symbols]

 1 Light source for observation 4 Light source for photography 9 Illumination diaphragm 12 Perforated mirror 13 Objective lens 17 Mask 18 Photographic film 21 Infrared TV camera 22 TV monitor

Claims (4)

[Claims] 1. An illuminating means for illuminating a fundus of an eye to be inspected, a photographing means for photographing a fundus image illuminated by the illuminating means, and an inserting means for inserting a diaphragm for limiting a photographing irradiation range into the optical path at the time of photographing. An ophthalmologic photographing apparatus, comprising: an identifying unit for identifying a direction of a fundus image on the diaphragm. 2. The ophthalmologic imaging apparatus according to claim 1, wherein the aperture is inserted at a position substantially conjugate with the fundus of the eye to be inspected by the illumination unit or the imaging unit. 3. The ophthalmologic imaging apparatus according to claim 1, wherein the identifying means has a shape for identifying a direction of a fundus image in an opening of the diaphragm. 4. The ophthalmologic imaging apparatus according to claim 1, wherein the identifying unit has an opening in a light blocking member that limits an imaging light irradiation range of the diaphragm.