JPH08117193A - Fundus camera - Google Patents

Abstract

PURPOSE: To provide a fundus camera capable of imprinting data information simultaneously with an IR fluorescent fundus image. CONSTITUTION: This fundus camera has a TV camera 34 which has an image pickup sensitivity in an IR fluorescent wavelength region and receives the IR fluorescent fundus image 40. The apparatus is provided with an optical system 35 for projection which projects the IR luminous fluxes for forming the data information 41 simultaneously with forming the IR fluorescent fundus image 40 to the image pickup plane 34a of this TV camera 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a fundus camera capable of performing infrared fluorescence photography.

[0002]

2. Description of the Related Art A fundus camera has a film camera which has a sensitivity in the visible wavelength range to receive a visible fundus image (including a visible fluorescent fundus image), and a visible light flux for forming data information on the film surface. There is also a projection optical system for projecting onto a film so that the data such as the date and time of photographing, the name of the patient or the examinee, the serial number, etc. can be transferred onto the film simultaneously with the visible fundus image.

[0003]

By the way, the fundus camera is equipped with a TV camera, and has a TV camera which has an imaging sensitivity in the visible wavelength region and receives a visible fundus image, and an imaging sensitivity in the infrared fluorescence wavelength region. There is a case where an infrared fluorescent fundus image is photographed by exchanging with a TV camera which receives the infrared fluorescent fundus image. In this type of fundus camera, a projection optical system for forming data information is a visible light beam. Therefore, the data information cannot be imprinted at the same time as the infrared fluorescent fundus image.

Therefore, conventionally, an external device such as a video timer for data information is connected to the image processing apparatus, data information is input through this external device, and the work is performed to synthesize with the infrared fluorescent fundus image. Therefore, the conventional fundus camera capable of performing infrared fluorescence imaging has a problem that the input operation of data information is troublesome.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a fundus camera capable of imprinting data information simultaneously with an infrared fluorescent fundus image.

[0006]

In order to solve the above-mentioned problems, the fundus camera according to claim 1 of the present invention has an imaging sensitivity in the infrared fluorescence wavelength region and receives an infrared fluorescence fundus image. In a fundus camera including a TV camera, a projection optical system for projecting an infrared light flux for forming data information at the same time as the infrared fluorescent fundus image is provided on an image pickup surface of the TV camera.

[0007]

According to the fundus camera of the first aspect of the present invention, since the projection optical system projects the infrared light flux for forming the data information, the infrared fluorescent fundus image is simultaneously displayed on the image pickup surface of the TV camera. Data information is received.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, 1 is an illumination optical system and 2 is a photographing optical system. The illumination optical system 1 includes a halogen lamp 3 as an observation light source, a spherical reflecting mirror 3 ', a condenser lens 4, a xenon tube 5, a condenser lens 6, a ring diaphragm 7, a relay lens 8, a mirror 9, and a relay lens 10 as a photographing light source. , A black dot plate 10 ', and a relay lens 10''.

The photographing optical system 2 is roughly composed of an objective lens 11, a perforated mirror 12, a focusing lens 13, an imaging lens 14, quick return mirrors 15, 16, 50 and a film 17. The objective lens 11 faces the subject's eye 18. The ring diaphragm 7 is a relay lens 8, 10, 10 '.
′, The objective lens 11 is provided at a position substantially conjugate with the pupil of the subject's eye 18.

At the time of observation, the illumination light of the halogen lamp 3 passes through the condenser lenses 4 and 6, the ring diaphragm 7, the relay lens 8, the mirror 9, the relay lenses 10 and 10 ″, the perforated mirror 12, and the objective lens 11. Is guided to the subject's eye 18 and illuminates the fundus 20 of the subject's eye 18. The illumination light becomes ring-shaped illumination light when passing through the pupil of the subject's eye 18. During photographing of the eye to be inspected, the xenon tube 5 is caused to emit light by operating a photographing switch (not shown), and the fundus 20 is illuminated in the same manner.

The light flux from the fundus 20 is guided to the perforated mirror 12 via the objective lens 11 and to the quick return mirror 15 via the perforated portion 12a of the perforated mirror 12, the focusing lens 13 and the imaging lens 14. Reach Here, the quick return mirror 15 is retracted from the optical path of the photographing optical system 2 during visible light observation and photographing, and is inserted into the optical path of the photographing optical system 2 during infrared fluorescence observation and photographing. The quick return mirror 15 constitutes a part of the television image receiving system 21, and the television image receiving system 21 will be described later.

The quick return mirror 16 is inserted into the optical path of the photographing optical system 2 during observation during visible light photographing, and the light flux from the fundus 20 is reflected by the quick return mirror 16 so that a fundus image is formed in the eyepiece optical system 22. The light flux that forms an image of the fundus image on the field lens 23 is reflected by the prism 24 and enters the eye of the examiner 26 via the eyepiece lens 25. Thereby, the fundus 20 of the subject's eye 18 is observed.

A visible fluorescence exciter filter 27 and an infrared fluorescence exciter filter 28 can be inserted into and removed from the optical path between the condenser lens 6 and the ring-shaped diaphragm 7 of the illumination optical system 1. In addition, in the optical path between the perforated mirror 12 of the photographing optical system 2 and the focusing lens 13, a barrier filter 29 for visible fluorescence and a barrier filter 30 for infrared fluorescence are provided.
And can be inserted and removed.

During visible color photography, the visible fluorescence exciter filter 27 and the infrared fluorescence exciter filter 28 are retracted from the optical path of the illumination optical system 1, and the visible fluorescence barrier filter 29 and the infrared fluorescence barrier filter 30 are photographed. It is retracted from the optical path of the optical system 2. Exciter filter 27 for visible fluorescence at the time of visible fluorescence photography
Is inserted into the optical path of the illumination optical system 1. Similarly, the visible fluorescence barrier filter 29 is inserted in the optical path of the photographing optical system 2. At the time of infrared fluorescence imaging (wavelength 800 nm to 950 nm), the infrared fluorescence exciter filter 28 is inserted into the optical path of the illumination optical system 1. Similarly, the infrared fluorescence barrier filter 30 is inserted in the optical path of the photographing optical system 2.

The television image receiving system 21 includes a field lens 31, a deflecting mirror 32, a TV relay lens 33,
The TV camera 34 is mainly configured. TV camera 3
Numeral 4 is set so that both the one having the imaging sensitivity in the infrared fluorescence wavelength region and receiving the infrared fluorescence fundus image and the one having the imaging sensitivity in the visible wavelength region and receiving the visible fundus image are exchangeable. It

This fundus camera has a projection optical system 35 for projecting a light beam for forming data information. The projection optical system 35 is roughly made up of a data display 36, a light source 37, and a field lens 38 that also serves as a deflector. The light source 37 is provided with visible light LEDs and infrared light LEDs. The data display 36 can display a timer, an imaging date / time, the name of a patient or an examinee, a serial number, and the like. The data display 36 is here illuminated laterally by a light source 37, the reflected light of which forms a luminous flux forming the data information.

When a photographing switch (not shown) is operated during visible color photographing and visible fluorescent photographing, the xenon tube 5 emits light to illuminate the fundus 20 and at the same time the quick return mirror 16 retracts from the optical path of the photographing optical system 2. Then, the reflected light flux from the fundus 20 is guided to the film 17 to perform film recording. At that time, the quick return mirror 50 is simultaneously inserted into the projection optical system 35, and the data is also recorded on the film 17.

When the quick return mirror 15 is inserted in the optical path of the photographing optical system 2, the electronic image recording mode is set. T
Assuming that a V-camera 34 having an imaging sensitivity in the visible wavelength region and receiving a visible fundus image is set in the fundus camera, when the exciter filter 27 for visible fluorescence is inserted into the optical path of the illumination optical system 1, The visible light LED is emitted and the infrared LED is turned off in association with the insertion into this optical path, and the visible light flux is converted into the field lens 38 and the deflection mirror 32.
The visible fluorescent fundus image is received by the image pickup surface 34a of the TV camera 34, and at the same time, the data information is received by the image pickup surface 34a of the TV camera 34. Assuming that the TV camera 34 having an imaging sensitivity in the infrared fluorescence wavelength region and receiving an infrared fluorescence fundus image is set in the fundus camera, the exciter filter 28 for infrared fluorescence is provided in the optical path of the illumination optical system 1. When it is inserted, the infrared light LED emits light and the visible light LED is turned off in association with the insertion into this optical path, and the infrared light flux emits the infrared light flux.
8. The infrared fluorescent fundus image is guided to the TV camera 34 via the deflection mirror 32, and the infrared fluorescent fundus image is received on the image pickup surface 34a of the TV camera 34, and at the same time, the data information is received on the image pickup surface 34a of the TV camera 34.

FIG. 1 shows a state in which the infrared fluorescent fundus image and the data information are displayed on the monitor television 39. In FIG. 1, 40 is an infrared fluorescent fundus image, 4
Reference numeral 1 indicates data information.

As described above, in the embodiment, the light source 37 is configured so that the emission switching is linked with the insertion / removal of the exciter 27 for visible fluorescence and the exciter filter 28 for infrared fluorescence into / out of the optical path of the illumination optical system 1. In the case of a fundus camera that uses a laser diode as an excitation light source for imaging,
Since the exciter filter 28 for infrared fluorescence is not provided, the infrared L as the light source 37 is interlocked with the insertion of the barrier filter 30 for infrared fluorescence into the optical path of the photographing optical system 2.
The ED may emit light.

Further, in the embodiment, the data display 36 is illuminated from the side, but it is also possible to use the transmission type data display 36.

Further, in the embodiment, the visible light LE is applied to the light source 37.
Although it is decided to use the D and the infrared light LED, the projection optical system 3 of the visible light transmission filter and the infrared light transmission filter is used by using one light source 37 which emits light having a wavelength of visible light to infrared light.
It is also possible to adopt a configuration in which visible light and infrared light are switched according to the insertion / removal of the optical path 5 into / from the optical path.

[0023]

Since the fundus camera according to claim 1 of the present invention is configured as described above, data information can be imprinted simultaneously with an infrared fluorescent fundus image, and the work of inputting data information can be reduced. The effect that it can be achieved is produced.

[Brief description of drawings]

FIG. 1 is a diagram showing an optical system of a fundus camera according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Illumination optical system 2 ... Imaging optical system 20 ... Fundus 34 ... TV camera 34a ... Imaging surface 35 ... Projection optical system 37 ... Light source 40 ... Infrared fluorescent fundus image 41 ... Data information

Claims (3)

[Claims] 1. A fundus camera including a TV camera having an imaging sensitivity in an infrared fluorescence wavelength region and receiving an infrared fluorescence fundus image, wherein data is simultaneously recorded on the imaging surface of the TV camera with the infrared fluorescence fundus image. A fundus camera provided with a projection optical system for projecting an infrared light flux for forming information. 2. A TV camera having an imaging sensitivity in the infrared fluorescence wavelength region and receiving an infrared fluorescence fundus image is replaceable with a TV camera having an imaging sensitivity in the visible wavelength region and receiving a visible fundus image. The fundus camera according to claim 1, wherein the data light beam projection optical system includes an infrared light source and a visible light source, and is capable of projecting a visible light beam for forming data information simultaneously with the visible fundus image. 3. The fundus camera according to claim 2, wherein switching between the infrared light source and the visible light source is interlocked with an infrared fluorescence photographing filter.