JPH08308802A - Ophthalmic imaging device - Google Patents

Abstract

(57) [Summary] [Purpose] Automatically set the fixation target position in conjunction with the shooting switch. A light flux from a light source for fixation 26 is presented to an eye E through a liquid crystal shutter 25 having an opening at a predetermined position. The light source 33 for photographing is emitted, and its light flux is projected onto the fundus Er of the eye E through the ring diaphragm 32, the perforated mirror 21, and the objective lens 20, and the reflected light thereof is the field diaphragm 28,
An image is formed on the imaging element 30 via the imaging lens 29, and the first image is recorded in the storage unit of the control unit 34. Next, the position of the opening of the liquid crystal shutter 25 is changed, and the second image is recorded in the same manner.

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 used in an ophthalmology clinic, group medical examination and the like.

[0002]

2. Description of the Related Art Conventionally, a fundus camera which records a fundus image of a subject's eye or the like on an electronic image using a CCD camera has been known. FIG. 5 shows the configuration of a conventional fundus camera. On the optical path behind the objective lens 1 in front of the eye E to be inspected, a perforated mirror 2 having an opening in the center, a taking lens 3, and a rotatable mirror 4 are provided. It is arranged. A fixation optical system is provided above the rotatable mirror 4, and includes a relay lens 5, a mirror 6, and an eye E to be inspected.
The fixation light source 7 for fixing the fixation light source 7 and the lever 8 for moving the fixation light source 7 are sequentially arranged.

Behind the rotatable mirror 4, there are a field lens 9, a field stop 10, an imaging lens 11 and an image pickup means 1.
2 are arranged, and a lens 13, a ring diaphragm 14, and a photographing light source 15 are provided on the optical path in the incident direction of the perforated mirror 2.
Are arranged. Here, the ring diaphragm 14 is the lens 1
3 is arranged substantially conjugate with the perforated mirror 2.
The output of the image pickup means 12 is connected to a control means 16 having a built-in storage section, and the control means 16 is connected to a television monitor 17 and a photographing switch 18, respectively.

The light flux from the light source 7 for fixation is presented to the eye E through the mirror 6, the relay lens 5, the rotatable mirror 4, the photographing lens 3, the perforated mirror 2 and the objective lens 1. When the photographing switch 18 is pressed, the photographing light source 5 emits light, and the luminous flux from the photographing light source 15 is emitted from the ring diaphragm 14 and the lens 1.
3, the perforated mirror 2, the objective lens 1, and the pupil Ep to illuminate the fundus Er, and the reflected light returns in the reverse optical path, passes through the objective lens 1, the perforated mirror 2, and the taking lens 3, and is rotated. Movable mirror 4 is out of the optical path, field lens 9,
An image is formed on the image pickup means 12 through the field stop 10 and the image forming lens 11. The control means 16 projects the fundus image Pr on the television monitor 17 by this signal.

[0005]

However, in the above-mentioned conventional example, it is necessary to move the position of the light source 7 for fixation every time the photographing position is changed, and it is possible to perform continuous photographing especially with a small amount of photographing light. When performing electronic image recording, there is a drawback that these operations are time-consuming and extremely troublesome.

The object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide an ophthalmologic photographing apparatus capable of automatically setting a fixation target position in association with a photographing switch.

[0007]

In order to achieve the above object, an ophthalmologic photographing apparatus according to the present invention comprises an illuminating optical system for illuminating an eye to be inspected, and an image taking means for taking an image of the eye to be inspected illuminated by the illuminating optical system. A fixation target for guiding the eye to be inspected, a fixation target presenting means for presenting at least two different positions, a control means for controlling the fixation target presenting means, and an imaging switch It is characterized by further comprising operation means for sequentially changing the fixation target presenting position of the fixation target presenting means to a predetermined position for photographing.

[0008]

In the ophthalmic photographing apparatus having the above-mentioned structure, the photographing switch is operated by the operating means, the fixation target presenting means presents the fixation target at two or more different positions, and guides it to the eye to be examined. While sequentially changing the fixation target presenting position to a predetermined position, the illumination optical system illuminates the eye to be inspected, and the illuminated image of the eye to be inspected is photographed by the photographing means.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in FIGS. FIG. 1 is a side view showing the configuration of the first embodiment. On the optical path behind the objective lens 20 facing the eye E to be inspected, a perforated mirror 21 having a central opening and a taking lens 22. , The rotatable mirror 23 is sequentially arranged, and the fixation optical system above the rotatable mirror 23 is
An image forming lens 24, a liquid crystal shutter 25, and a light source for fixation 26 are arranged, and a field lens 27, a field stop 28, an image forming lens 29, and an image pickup means 30 are provided in the image forming optical system behind the rotatable mirror 23. They are arranged in sequence.

Further, a lens 31, a ring diaphragm 32, and a photographing light source 33 are arranged in the illumination optical system in the incident direction of the perforated mirror 21, and the ring diaphragm 32 is substantially conjugate with the perforated mirror 21 with respect to the lens 31. It is located in. The output of the image pickup means 30 is connected to a control means 34 having a built-in storage section, and the control means 34 is connected to a television monitor 35, a photographing switch 36, and a liquid crystal shutter 25, respectively.

At the time of photographing, the light flux from the light source for fixation 26 is directed to the eye E through the liquid crystal shutter 25, the imaging lens 24, the rotatable mirror 23, the photographing lens 22, the perforated mirror 21, and the objective lens 20. Presented.

A light beam emitted from a light source for fundus observation (not shown) passes through the opening of the ring diaphragm 32, the lens 31, is reflected to the left by the mirror portion of the perforated mirror 21, passes through the objective lens 20, and the eye E to be examined. The fundus Er is illuminated from the pupil Ep. The reflected light flux here passes through the pupil Ep, the objective lens 20, the aperture of the perforated mirror 21, and the taking lens 22, the rotatable mirror 23 is deviated from the optical path, and the field lens 27.
The image is once formed as a fundus image in the vicinity of the field stop 28 via the, and is again formed on the photographing means 30 by the image forming lens 29. The fundus image Pr formed on the photographing means 30 is converted into a video signal and displayed on the television monitor 35 via the control means 34.

The examiner observes the moving image fundus image Pr displayed on the television monitor 35, adjusts the photographing lens 22 to aim at the fundus image Pr, and then pushes the photographing switch 36 to cause the photographing light source 33. Is lit to record the first image as a still image in the storage unit inside the control means 34. At this time, the positional relationship between one opening A of the liquid crystal shutter 25 and a large number of light-shielding portions B is as shown in FIG. Next, the control means 34 changes the liquid crystal shutter 25 to the positional relationship between the opening A ′ and the light shielding part B as shown in FIG. 3, and the photographing switch 36 is pressed again to cause the photographing light source 33 to emit light.
The second image at a fixation position different from that of the first image is recorded as a still image in the storage unit inside the control means 34. After that, similarly, the third and fourth images are recorded as still images as needed.

FIG. 4 shows a front view of the fixation target of the second embodiment, in which a fixation target 37 composed of a plurality of LEDs is one lighting portion C.
The fixation position is changed by a large number of extinguishing parts D.

In the above two embodiments, the fixation position is changed each time the photographing switch is pressed. However, the fixation position is continuously changed by one operation of the photographing switch to obtain a plurality of still images. May be recorded. Although the fixation target is placed inside the main body, it may be placed outside the main body.
Further, a plurality of fixation targets may be arranged inside and outside the main body and may be switched sequentially.

[0016]

As described above, the ophthalmologic photographing apparatus according to the present invention uses the fixation target presenting means for presenting at least two different positions to change the photographing position with the photographing switch. Since it is possible to perform the ophthalmologic imaging, it is possible to omit the trouble of setting the fixation position each time and efficiently perform ophthalmologic imaging.

[Brief description of drawings]

FIG. 1 is a side view of a taking optical system according to a first embodiment.

FIG. 2 is a front view of a fixation target.

FIG. 3 is a front view of a fixation target.

FIG. 4 is a front view of a fixation target according to a second embodiment.

FIG. 5 is a side view of a conventional taking optical system.

[Explanation of symbols]

 20 Objective Lens 23 Rotatable Mirror 25 Liquid Crystal Shutter 26 Fixation Light Source 30 Imaging Device 33 Imaging Light Source 34 Control Device 35 Television Monitor 36 Imaging Switch 37 Fixation Target

Claims (4)

[Claims] 1. An illumination optical system for illuminating an eye to be inspected, and an imaging means for taking an image of an eye to be inspected illuminated by the illumination optical system,
A fixation target for guiding the eye to be inspected, a fixation target presenting means for presenting at least two different positions, a control means for controlling the fixation target presenting means, and the fixation switch interlocking with a photographing switch. An ophthalmologic photographing apparatus comprising: an operation unit that sequentially changes the fixation target presentation position of the optotype presentation unit to a predetermined position to perform imaging. 2. The ophthalmologic photographing apparatus according to claim 1, wherein the photographing means is an electronic image sensor. 3. The ophthalmologic photographing apparatus according to claim 1, wherein the fixation target presenting means is a liquid crystal shutter. 4. The ophthalmologic photographing apparatus according to claim 1, wherein the fixation target presenting means is a light source in which a plurality of LEDs are arranged.