JP2966914B2 - Ophthalmic imaging equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] According to the present invention, when a main image is formed on one image recording unit, a sub-image can be formed at a position different from the main image forming position, and The present invention relates to an ophthalmologic photographing apparatus capable of forming a sub-image at a position different from a main image forming position when a main image is formed on an image recording unit.

[Prior Art] Conventionally, as shown in FIG. 4, one of the image recording means is provided in the main image taking optical path 51 of a fundus image obtained by illuminating the fundus of the eye E to be inspected by an illumination optical system 50. A main image taking optical path switching mirror 54 for switching the main image taking optical path 51 between the CCD camera 52 and the film 53 as the other image recording means, and a perforated mirror 55 and a main image taking optical path switching mirror A pentaprism 56 and a projection lens 57 for forming a sub-image projection optical path are provided between the main image capturing optical path switching mirror 54 and the main image capturing optical path switching mirror 54 at the position shown by the solid line. In addition to the reflection, the sub-image light of the sub-image light source 58 is reflected by using a part of the main image shooting optical path switching mirror 54, and guided to the CCD camera 52 via the mirror 54 ', and the photoelectric conversion output of the CCD camera 52 is output. Is processed by the processing circuit 59. TV monitor 60
A main image (for example, a fundus image) 61 and a sub-image (for example, a shooting date) 62 are displayed on the other hand, while a main image shooting optical path switching mirror 54 is displayed.
An ophthalmologic photographing apparatus is known which forms a main image 61 and a sub-image 62 on a film 53 when is retracted from a main image photographing optical path and is at a position indicated by a broken line.

[Problems to be Solved by the Invention] However, in such an ophthalmologic imaging apparatus, a sub-image projection optical path is switched by using a part of the main image imaging optical path switching mirror 54 to project a sub-image. Therefore, the projection optical path of the sub-image becomes long, and the use of a pentaprism or the like increases the cost.

Accordingly, an object of the present invention is to provide an ophthalmologic photographing apparatus that can simplify the optical system of the sub-image projection optical path and reduce the cost.

[Means for Solving the Problems] An ophthalmologic photographing apparatus according to the present invention is provided in the middle of a main image photographing optical path for photographing a main image, in order to solve the above-mentioned problems. A main image photographing optical path switching mirror for selectively projecting the main image onto one of the other image recording means, and a sub image for projecting a sub image at a position different from the main image forming position of each image recording means A sub-image shooting switching mirror that is arranged in the middle of the projection optical path and selectively projects the sub-image onto one of the one image recording unit and the other image recording unit; The main image projection switching mirror is configured to be switched in accordance with the switching of the mirror.

[Operation] According to the ophthalmologic photographing apparatus of the present invention, when the main image photographing optical path switching mirror is switched so that the main image is formed on one of the image recording means, the sub image photographing switching mirror is operated by the main image photographing switching mirror. Switching is performed so as to project the sub-image onto one of the image recording means according to the photographing optical path switching mirror. When the main image capturing optical path switching mirror is switched so that the main image is formed on the other image recording means, the sub image capturing switching mirror is switched to the other image recording means in accordance with the main image capturing optical path switching mirror. Is switched to project the sub-image to

Embodiment An embodiment of an ophthalmologic photographing apparatus according to the present invention will be described below with reference to the drawings.

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 condenser lens 4, a xenon tube 5, a condenser lens 6, a filter 7 for exciting infrared fluorescence, a ring-shaped diaphragm 8, a relay lens 9, a mirror 10, a relay 10, as a photographing light source. It is roughly composed of a lens 11.

The photographing optical system 2 includes an objective lens 12, a perforated mirror 13, a barrier filter for infrared fluorescence 14, a focusing lens 15, and an imaging lens.
16 and a main image capturing optical path switching mirror 17 to be described later.

The objective lens 12 faces the eye E to be examined. The ring-shaped diaphragm 7 is provided at a position substantially conjugate with the pupil e of the eye E with respect to the relay lenses 9 and 11 and the objective lens 12.

When observing the fundus Er of the eye E during visible light imaging, the illumination light of the halogen lamp 3 includes condenser lenses 4 and 6, a ring-shaped aperture 8, a relay lens 9, a mirror 10,
The eye E is guided to the eye E through the relay lens 11, the perforated mirror 13, and the objective lens 12, and illuminates the fundus Er of the eye E. The illumination light becomes ring-shaped illumination light when passing through the pupil e of the eye E.

When the fundus Er of the eye E is photographed, the xenon tube 5 emits light by operating a photographing switch (not shown), and the fundus Er is similarly illuminated.

The luminous flux from the fundus Er is guided to a perforated mirror 13 through an objective lens 12, and is passed through a hole 13a of the perforated mirror 13, a focusing lens 15, and an imaging lens 16 to switch a main image taking optical path switching mirror.
Reaches 17. The main image capturing optical path switching mirror 17 switches the optical path of the main image capturing optical system 2.

When the main image taking optical path switching mirror 17 is inserted into the optical path of the main image taking optical system 2 as shown by a solid line, the main image taking light passes through the mirror 18 and the relay lens 19 as one image recording means. It is led to the CCD camera 20. CCD camera 20
Is output to the processing circuit 21, and the processing circuit 21 outputs a video signal to the television monitor 22 based on the photoelectric conversion signal. The television monitor 22 displays, for example, a fundus image 23 as a main image based on the video signal.

On the other hand, when the main image capturing optical path switching mirror 17 is retracted from the optical path of the main image capturing optical system 2, the optical path of the main image capturing optical system 2 is detected via the quick return mirror 24, the mirror 25, and the eyepiece 26. Is guided to the eye Ek. The examiner looks at the fundus Er of the eye E while looking through the eyepiece 26. When film recording is performed, the quick return mirror 24 is retracted from the optical path of the main image photographing optical system 2 by operating a photographing switch (not shown), and the xenon tube 5 is made to emit light, so that the fundus as the main image is formed on the film 27. An image 23 is formed.

The main image capturing optical path switching mirror 17 is, as shown in FIG.
It is attached to the rotating cylinder 30. The rotary cylinder 30 is connected to a rotating means (not shown). Main image taking optical path switching mirror
17 switches the optical path of the main image taking optical system 2 between the CCD camera 20 and the film 27 based on the operation of the rotating means.

A rotary shaft 31 is rotatably inserted into the rotary cylinder 30. Two arms 32 are attached to the rotating shaft 31 at an interval. At the ends of the two arms 32, a sub image projection switching mirror 33 is provided.

The sub image projection switching mirror 33, as shown in FIG.
The sub-image light of the sub-image light source 34 is used as one image recording unit.
CCD camera 20 and film 27 as the other image recording means
It performs the function of switching between and. The sub-image is, for example, the date and time of imaging, the chart number of the subject, and the like. The optical axis of the optical path of the sub-image projection optical system 35 is orthogonal to the optical axis of the optical path of the main image capturing optical system 2.

When the main image shooting optical path switching mirror 17 is at the position indicated by the solid line so that the fundus image 23 as the main image is displayed on the CCD camera 20, the sub image projection switching mirror 33 is At a predetermined angle θ, the sub-image light source 34 is retracted to the position shown by the solid line so as not to block the sub-image light, and as shown in FIG. Since the sub-image light is located at a position avoiding the image light source 34, the sub-image light is guided to the CCD camera 20 via the relay lens 36, and the sub-image 37 is displayed at a position different from the main image forming position of the television monitor 22.

The sub image projection switching mirror 33 is retracted to a position where the main image photographing optical path switching mirror 17 does not interfere with the optical path of the main image photographing optical system 2 so that the fundus image 23 as the main image is formed on the film 27. Sometimes the main image taking optical path switching mirror
It is rotated in the direction of arrow B in response to the rotation of arrow 17 in the direction of arrow 17,
It is inserted into the optical path of the sub-image projection optical system 35. Accordingly, the sub-image light from the sub-image light source 34 is reflected by the sub-image projection switching mirror 33 and guided to the film 27 via the relay lens 38. Accordingly, the sub image 37 is formed at a position different from the main image forming position.

FIG. 3 shows a modification of this embodiment, in which the main image taking optical path switching mirror 17 is moved in the axial direction of the arrow C to retract from the optical path of the main image taking optical system 2 and to switch the sub image projection. The mirror 33 is moved in the axial direction of the arrow D in accordance with the main image capturing optical path switching mirror 17 to be positioned directly above the sub image light source 34, and the optical path of the main image capturing optical system 2 and the sub image projecting optical system 35 The optical path is switched. Note that various recording media can be arbitrarily used as the image recording means. At least one of the main image capturing optical path switching mirror 17 and the sub image projection switching mirror 33 may be a liquid crystal mirror.

[Effects of the Invention] The ophthalmologic photographing apparatus according to the present invention, as described above,
A main image photographing optical path switching mirror that is disposed in the middle of the main image photographing optical path for photographing the main image and selectively projects the main image to one of the image recording means or the other image recording means; Each of the image recording units is disposed in a sub-image projection optical path for projecting a sub-image at a position different from the main image forming position, and is selectively provided to one of the one image recording unit and the other image recording unit. A sub-image capturing switching mirror for projecting the sub-image, wherein the sub-image capturing switching mirror is configured to be switched in accordance with the switching of the main image capturing switching mirror. This makes it possible to provide an ophthalmologic photographing apparatus capable of simplifying the optical system and reducing the cost.

[Brief description of the drawings]

FIG. 1 is an optical diagram showing the overall configuration, FIGS. 2 and 3 are explanatory diagrams showing the operation of a main image photographing optical path switching mirror and a sub image photographing switching mirror, and FIG. 4 is an entire conventional ophthalmologic photographing apparatus. FIG. 3 is an optical diagram showing a configuration. 2. Main image taking optical system 17 Main image taking optical path switching mirror 20 CCD camera (image recording means) 23 Main image 27 Film (image recording means) 33 Sub image projection switching mirror 35 …… Sub-image projection optical system 36 …… Sub-image

Claims (1)

(57) [Claims] 1. A main image photographing optical path which is arranged in a main image photographing optical path for photographing a main image and selectively projects the main image to one of image recording means or the other image recording means. A switching mirror, which is disposed in the middle of a sub-image projection optical path for projecting a sub-image at a position different from the main image forming position of each of the image recording units, and which is one of the one image recording unit and the other image recording unit. A sub-image projection switching mirror for selectively projecting the sub-image, and the sub-image projection switching mirror,
An ophthalmologic photographing apparatus configured to switch in accordance with switching of the main image projection switching mirror.