JPH04200437A - fundus camera - Google Patents

Abstract

PURPOSE:To enable a film photographing and a video photographing of a high picture quality by introducing an eyeground reflected luminous flux of luminous fluxes of a flash light source for photographic recording to a TV camera or a film camera. CONSTITUTION:When a light source 1 for observation is turned ON in the observation of the eyeground, a luminous flux is reflected with a bored mirror 5 through a lens 2 and a lens 4 to light the eyeground Er via an objective lens 6. Reflected image of the eyeground is reflected with a quick return mirror 8 through an opening of the bored mirror 5 and an imaging lens 7 and an image is formed on a TV camera 11 with a lens 10 to be outputted to a TV monitor 12. In this manner, an inspecting person observes an eyeground image to perform a positioning of an eye E to be inspected. When a photographic recording with the TV camera 11 is selected with a photography method selection switch 15, a strobe light source 3 for photographing is turned ON, the luminous flux travels in the same optical path as the luminous flux from the light source 1 does and the eyeground image is formed on the TV camera 11 to be recorded into a recording means 13. When the photographic recording with a film 9 is selected, the quick return mirror 8 is separated from an optical axis 02 and the strobe light source 3 is turned ON to form the eyeground image on the film 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a fundus camera used, for example, in eye clinics.

[Prior art 1] In conventional fundus cameras, when photographing and recording the fundus image of the eye to be examined, it is illuminated with a strobe light source and photographed in a filmed manner. At the same time, video is taken using an observation light source. There is. Alternatively, in a non-mydriatic fundus camera for infrared flux fundus observation, for example, Japanese Patent Application Laid-Open No. 57-183
As disclosed in Japanese Patent No. 830, it has been proposed that the fundus of the eye is illuminated with a light beam from a strobe light source, and the fundus image is divided into spectra using a half mirror for film photography and video photography.

[Problem to be Solved by the Invention 1] However, in the above-mentioned conventional example, since it takes time to develop each image on film, it cannot be used for immediate diagnosis. Take video with observation light source! , , etc., the sensitivity of the image pickup tube is low and the amount of light is insufficient, making it impossible to obtain a high-quality fundus image. On the other hand, the J method used in non-mydriatic fundus cameras (Record 2) has the disadvantage that it cannot be applied to general fundus cameras.

An object of the present invention is to provide a fundus camera that is capable of photographing a fundus image on film and high-quality video, and is applicable to non-mydriatic and mydriatic types.

[Means for Solving the Problems j] In order to achieve the above-mentioned object, the fundus camera according to the present invention includes a fundus observation optical system comprising a television camera, a video signal recording device, and an image display means, and a film camera. A fundus photographing optical system, a continuous light lamp for fundus observation, a flash light source for photographing and recording, a quick return mirror that branches an optical path into the fundus observation optical system and the photographing optical system, and a recording method selection means. The apparatus is characterized in that the click return mirror and recording method selection means selectively guide the fundus reflected light flux from the flash light source to the television camera or film camera.

[Function] The fundus camera having the above-mentioned configuration selectively guides the fundus-reflected light flux from the flash light source for photographing and recording to the television camera or film camera using the quick return mirror and the recording method selection means. Capturing fundus images on film and high-quality video is possible.

[Example] The present invention will be explained in detail based on illustrated embodiments.

FIG. 1 shows a configuration diagram of the first embodiment, from an observation light source 1 that emits a visible light flux by continuously lighting an incandescent lamp or the like to an eye to be examined E.
A lens 2, a photography strobe light source 3 that emits visible light, a lens 4, a perforated mirror 5, and an objective lens 6 are arranged on the optical axis O1 leading to the perforated mirror 5.
On the optical axis 03 of the quick return mirror 8, an imaging lens 7, a quick return mirror 8 that can be inserted and removed from the optical path, and a film 9 are arranged.
0, a television camera 11 is arranged, and the output of the television camera 11 is connected to a television monitor 12 and a recording means 13. Further, as shown in FIG. 2, a control circuit 14 is provided for controlling the entire fundus camera.
The output of No. 4 is connected to photographing strobe light #i3, quick return mirror 8, recording means 13, and imaging method selection switch 15.

When observing the fundus, move the quick return mirror 8 to the optical axis 02.
When the observation light source 1 is turned on with the observation light source 1 inserted above, the light beam from the observation light source 1 travels along the optical axis 01, passes through the lens 2, the strobe light 1fiI3 for scenery photography 3, and the lens 4, and is reflected by the perforated mirror 5. and illuminates the fundus Er through the objective lens 6. The fundus reflected image returns along the same optical path and returns to the perforated mirror 5.
The light is reflected by the quick return mirror 8 through the aperture of the image forming lens 7, travels on the optical axis 03, and is imaged by the lens 10 onto the television camera 11. This fundus image is then output to the television monitor 12, and the examiner observes the fundus image and aligns the eye E to be examined.

In this state, if recording by the television camera 11 is selected by the imaging method selection switch 15, the control circuit 14
The photography strobe light 7TA3 is turned on in response to the command.
The light flux follows the same optical path as the light flux from observation light source 1,
The fundus image is formed on the television camera 11 and recorded as a video signal in the recording means 13 with high image quality.

When photographing on the film 9, use the photographing method selection switch 15 to select the photographing method on the film 9! 5. When recording is selected, the quick return mirror 8 is removed from the optical axis 02 in response to a command from the control circuit 14, and at the same time, the photography strobe light source 3 is turned on and the fundus image is formed on the film 9.

It is preferable to provide two selection buttons as the imaging method selection switch 15, and it is convenient to adopt a method for the recording means 13, for example, in which the video signal is A/D converted and then recorded in a disk memory or the like. It is. Further, the optical positions of the film photographing optical system and the television camera photographing optical system are interchangeable.

FIG. 3 shows a configuration diagram of the main parts of another embodiment in which the examiner directly observes the fundus Er of the eye E using an optical microscope, in which the quick return mirror 8 on the optical axis 03 and the lens IO A quick return mirror 16 is arranged between the optical axis 03 and the quick return mirror 16, which can be inserted into and removed from the optical axis 03.
An eyepiece 17 is disposed in the opposite direction, and the other configurations are the same as in the first embodiment.

In this case, when observing the fundus, use the quick return mirror 1.
6 is inserted into the optical axis 03+, the observation light source 1 is turned on, the fundus image is reflected by the light return mirror 16, and the light is guided to the optometrist e via the eyepiece 17.
1, the quick return mirror 16 is removed from the optical axis 03. Note that there is no need to move the quick return mirror 16 when recording on the film 9.

FIG. 4 shows the main part configuration M of another embodiment in which the present invention is applied to a non-mydriatic fundus camera.
An infrared light filter 19 that can be inserted and removed from the optical axis 03 is arranged, and the output of the control circuit 14 is connected to the trenoid 18, and an infrared light beam is emitted as the observation light #l. The digital camera 11 for fundus observation is sensitive to both infrared light and visible light.

When observing the fundus, insert the infrared light filter 19 into the optical axis 03 and use the infrared light beam (L2) to perform one observation, and when photographing with the camera 11: Therefore, by driving the photographing station [robo light source: simultaneously with the light emission of 3; solenoid] 8, the infrared light filter 15) is set to the optical axis 0.
Break away from 3 and shoot 1-1.

[Effects of the Invention] As described in 1-7 below, the fundus camera according to the present invention,
Since the light beam reflected from the bottom of the eye P4 (a flash light source for photography translation) is selectively guided to the TV camera or camera, it is possible to take ``no-ilm photography'' and high-quality video shooting.7 It is also applicable to non-mydriatic and mydriatic types, especially for immediate diagnosis;

[Brief explanation of the drawing]

The drawings show embodiments of a fundus camera according to the present invention.
1W i′i configuration diagram, FIG. 2 (''control circuit configuration diagram, FIG. 3, 41g!; j) is a configuration diagram of the main part of the embodiment. Reference numeral 1 is a light source for observation, and 3 is for photographing. A strobe light source, 8 a quick return mirror, 9 (a film), 11 a television camera, 12 a shaker monitor, 13 a recording means, 14 a control circuit, and 15 an imaging method selection switch. Patent applicant Canon Co., Ltd. Agent Person Patent Attorney Yukihiko Hibiya-Isa-1-ko''-

Claims (1)

[Claims] 1. A fundus observation optical system consisting of a television camera, a video signal recording device, and an image display means, a fundus photographing optical system using a film camera, and a continuously lit lamp for fundus observation;
It has a flash light source for photographing and recording, a quick return mirror that branches an optical path into the fundus observation optical system and the photographing optical system, and a recording method selection means, and the click return mirror and the recording method selection means select the A fundus camera characterized in that a fundus reflected light flux from a flash light source is selectively guided to the television camera or film camera.