JPH0435639A - fundus imaging device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement in a fundus photographing device capable of recording a fundus image on a disk by fluorescence photography and ordinary photography other than fluorescence photography.

[Prior Art] Conventionally, a fluorescent agent is intravenously injected into the human body and a fundus image based on fluorescence photography is recorded on a still video floppy disk, and a fundus image based on normal photography other than fluorescence photography is recorded on a still video floppy disk. Fundus photographing devices that are capable of recording images are known. This still video floppy disk has 52 tracks, and images can be recorded on 50 tracks, and one field's worth of images can be recorded on each track. Therefore,
A still video floppy disk can record 50 field images and 25 frame images.

By the way, fundus images obtained by fluorescence photography are taken primarily for the purpose of observing temporal changes in the blood vessels, etc. of the fundus, so it is desirable to capture as many images as possible. On the other hand, when it comes to photographing images of the fundus in normal photography, it is desirable to obtain high-quality photographed images rather than the number of images.

[Problems to be Solved by the Invention] However, this type of fundus imaging device uses the same image recording method for recording images during fluorescence imaging and during normal imaging other than fluorescence imaging. During fluorescence imaging, which requires a larger number of images than normal imaging, if the tracks on the still video floppy disk become full, it may be necessary to replace the still video floppy disk in the middle of fluorescence imaging. However, the number of replacements increases, making it inconvenient for the examiner to handle.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a fundus imaging device that can maintain the same high quality as before when recording images during normal imaging, while minimizing the number of disk replacements when recording images during fluorescence imaging. It is in.

[Means for Solving the Problems] A fundus photographing apparatus according to the present invention is provided with a changing means capable of changing image recording from frame recording to field recording during fluorescence photography.

[Function] According to the ophthalmological imaging device according to the present invention, the image recording method is changed from frame recording to field recording during fluorescence imaging, and the fundus image is field recorded on the disk.
Since the number of recordable tracks is relatively increased compared to the case of frame recording, it is possible to reduce the number of disk replacements as much as possible when recording images during fluorescence photography.

[Example 7] Hereinafter, an example of a fundus photographing apparatus according to the present invention will be described with reference to the drawings.

In Fig. 1, 1 is a concave mirror, 2 is a halogen lamp used as an observation light source, 3 is a relay lens, 4 is a xenon lamp used as a flash light source, 5 is a condenser lens, and 6 is an illumination diaphragm. They are sequentially arranged on the optical axis 8 to constitute an illumination optical system. lighting aperture 6
An exciter filter 9 is arranged between the condenser lens 5 and the condenser lens 5 so as to be insertable into the optical path of the optical axis 8. Also,
The xenon lamp 4 can emit light by operating the photographing switch 10.

Halogen lamp 2 and xenon lamp 4 are relay lenses 3
are conjugate to each other with respect to

The optical axis 8 is made into a reflected optical axis 11 by the mirror 7, and a projection lens 12 is disposed on this optical axis 11. 14 is an optical axis of the photographing optical system, and the optical axis 14 intersects with the optical axis 11 at the position of the hole 13a of the perforated mirror 13. This front axis 14
The eye 15 to be examined is positioned on an extension of the .

On the optical axis 14, in order from the one closest to the subject's eye 15, there is an objective lens 16, an aperture mirror 13, a photographic aperture 17, a focusing lens 19, an imaging lens 20. A half mirror 21, a quick return mirror 22, and an imaging means 23 such as a CCD are provided, and a barrier filter 18 is provided between the photographing aperture 17 and the focusing lens 19 so as to be insertable into the optical path of the optical axis 14. ing. The half mirror 21 is provided with a branching optical axis 24, and the branching optical axis 24 sequentially includes, from the side of the half mirror 21,
A lens 25, a display plate 26, and an illumination lamp 27 are provided.

Further, the quick return mirror 22 is provided with a branch optical axis 28, and the branch optical axis 28 is provided with a quick return mirror z.
Sequentially from side 2, field lens 29 and prism 30
is installed. At the refraction optical axis 31 of this prism 30, an eyepiece 33 is disposed, which the examiner's observation eye 32 faces.

The imaging means 23 is connected to a frame recording circuit 36 and a field recording circuit 37 via a signal processing circuit 38 and a changeover switch 35 as a changing means. The imaging means 23 is configured by a frame recording circuit 36 and a field recording circuit 37.
The image signal is magnetically recorded on a still video floppy disk 39.

The fundus image magnetically recorded on the still video floppy disk 39 for each frame or field is reproduced by a reproducing circuit 40 and displayed on an image display means 41 connected to the reproducing circuit 40.

In the second embodiment, a photographing mode setting means 43 is provided, and a changeover switch 44 allows setting of a plurality of modes including a normal photographing mode other than fluorescence photographing and a fluorescent photographing mode.

When shooting in normal shooting mode, switch 44
Connect to terminal tm. When this normal shooting mode is set, the exciter filter 9. Barrier filter 1
8 remains retracted from the optical path of each optical axis.

When the halogen lamp 2, which is the observation light source, is turned on, the observation light from the halogen lamp 2 passes through the relay lens 3, condenser lens 5, illumination diaphragm 6, is reflected by the mirror 7, passes through the projection lens 12, and is reflected by the aperture. The light is reflected by the mirror 13 and projected as an annular light beam near the iris of the eye 15 to be examined by the objective lens 16, and passes through the pupil to illuminate the fundus.

The fundus reflected light exits from the eye 15 to be examined and passes through the objective lens 16.
incident on . The fundus reflected light that has passed through the objective lens 16 passes through the hole 13a of the perforated mirror 13, and the fundus reflected light that has passed through the hole 17a of the photographic aperture 17 passes through the focusing lens 19 and is then passed through the imaging lens. 20, passes through a half mirror 21, is reflected by a quick return mirror 22, and is imaged on the front surface of a field lens 29. The fundus image formed on the front surface of the field lens 29 is observed through a prism 30 and an eyepiece 33. The examiner adjusts the camera while observing the fundus image of the eye 15 to be examined to find the desired imaging region. When the normal imaging mode is selected, the changeover switch 35 remains connected to the frame recording circuit 36 side. maintain the state of

When the examiner operates the photographing switch 10, the xenon lamp 4 emits light. Also, quick return mirror 22
is evacuated from the optical path of the optical axis 14. The photographing light passes through the condenser lens 5 and the illumination diaphragm 6, is reflected by the mirror 7, and is incident on the eye 15 to be examined in the same manner as the observation light, so that the fundus of the eye is illuminated. The fundus reflected light passes through the objective lens 16, aperture mirror 13, focusing lens 19, and imaging lens 20, and since the quick return mirror 22 is retracted from the optical path of the optical axis, it is imaged on the imaging means 23. Ru.

The image signal from the imaging means 23 is processed by a signal processing circuit 38 and recorded as a frame on a still video floppy disk 39 via a frame recording circuit 36. The fundus image recorded on the still video floppy disk 39 is reproduced by a reproduction circuit 40, and the image display means 4
1 is displayed.

Next, in order to perform fluorescence photography of the eye 15 to be examined, a changeover switch 44 is connected to the terminal ta. Then, the exciter filter 9 and the barrier filter 18 are connected to each optical axis 8.1.
It is inserted into the optical path of No. 4. When the exciter filter 9 and the barrier filter 18 are inserted into each optical path, the display plate 26 is rotated by a predetermined angle in response to a control signal from the mode setting means 43, and a message "Fluorescence photography. Field recording" is displayed on the optical path of the optical axis 24. It will switch.

” will be inserted.

This message is observed by the examiner through the lens 25, half mirror 21, quick return mirror 22, field lens 29, prism 30, and eyepiece 33.

Further, the changeover switch 35 is switched to the field recording side.

Therefore, when the examiner operates the photographing switch 10, the xenon lamp 4 emits light, and the exciter filter 9 causes illumination light of a predetermined excitation wavelength component to enter the eye 15 to be examined. The fluorescent agent is excited by the irradiation of the illumination light, and fluorescence light having a predetermined fluorescence wavelength passes through the barrier filter 18 and is imaged on the imaging means. The fundus vascular image of the subject's eye 15 is field-recorded on the still video floppy disk 39 by the image signal from the imaging means 23, and the fundus vascular image as a pseudo frame image is displayed on the image display means 41 based on the field recorded image. be done.

Here, if field recording is not to be performed during fluorescence imaging, by confirming the above message and operating a cancel switch (not shown), frame recording can be performed even during fluorescence imaging.

Further, in the embodiment, the configuration is such that the frame recording is automatically changed to the field recording during fluorescence photography, but the present invention is not limited to this, and the configuration may be such that the frame recording is manually switched to the field recording. .

In this case, "Switch to field recording"
By displaying this message, forgetting to switch can be prevented. Further, it is also possible to adopt a configuration in which the xenon lamp does not emit light even if the photographing switch 10 is operated unless switching to field recording is performed.

[Effects] Since the fundus imaging device according to the present invention is configured as described above, it maintains high-quality image recording as before during normal imaging, and uses a still video floppy when recording images during fluorescence imaging. This has the effect of reducing the number of disk replacements as much as possible.

[Brief explanation of the drawing]

FIG. 1 is an optical block diagram showing the configuration of an embodiment of the present invention. 2...Halogen lamp 9.18...Fluorescence filter 12...Projection lens 15...Eye to be examined 21.22...Quick mirror 2B...Display board 36...Frame recording circuit 39... Disc 43...Mode setting means 4...Xenon lamp 10...Photography switch 13...Perforated mirror 16...Objective lens 23...Imaging means 35...Selector switch 37... Field recording circuit 41...image display means

Claims (1)

[Scope of Claims] In a fundus imaging device capable of recording a fundus image as an electronic image by fluorescence photography and normal photography other than fluorescence photography, the image recording is changed from frame recording to field recording during the fluorescence photography. 1. A fundus photographing device, characterized in that it is provided with a changing means capable of changing.