JPS5850888Y2 - Crystalline lens cross-sectional imaging device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical slit cross-sectional photographing device for an eye lens.

2. Description of the Related Art A crystalline lens cross-sectional photographing apparatus is known that illuminates the crystalline lens of an eyeball with a slit and photographs the slit-illuminated area obliquely.

Conventional devices of this kind have a configuration that allows imaging of only vertical sections through the pupil of the eye, but in order to understand the pathology inside the crystalline lens in as much detail as possible, it is necessary to be able to capture not only vertical sections but also oblique and horizontal sections. is desirable.

For this purpose, it is best to rotate the slit illumination system and the imaging optical system as a unit around a horizontal axis, and furthermore, when such rotation is performed, the slit optical axis should not be deviated from the pupil of the eye to be examined. Therefore, it is desirable that the rotation axis coincides with the slit axis.

The purpose of this invention is to create a finder in which the position of the eyepiece does not change significantly due to rotation in a device in which the slit photographing system and the photographing optical system can be rotated together around the slit optical axis. The objective is to provide a system layout.

That is, the present invention is characterized in that the eyepiece optical axis of the finder system coincides with or is arranged close to the rotation axes of the slit projection system and the photographing optical system. After the light beam that has passed through the lens is introduced into the finder system using a reflector, it is once formed into an aerial image.
Furthermore, it can be realized by an arrangement in which the light flux from this object image is reflected parallel to the rotation axis by a reflecting mirror on or near the rotation axis, and the image is again formed by a relay lens and observed by an eyepiece.

In this case, the main plane of the relay lens is tilted with respect to the optical axis of the finder system, and the image plane of the first image of the subject initially formed in the finder system and the second image formed by the light flux passing through the relay lens are By making the extension of the main plane of the relay lens overlap the intersection line, the second image can be made perpendicular to the optical axis.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First, in FIG. 1, a crystalline lens cross-section photographing apparatus has a slit projection system S, a photographing optical system P, and a finder system F, all of which are housed within a housing 1.

The slit projection system S includes an illumination light source 2, a condenser lens 3, a slit diaphragm 4, reflecting mirrors 5 and 6, and a projection lens 7, and performs projection along a slit optical axis 8.

A reflector 9 is disposed between the slit diaphragm 4 and the condenser lens 3, and is moved from the retracted position shown by the chain line to the operating position shown by the solid line during photographing, and reflects light from the photographic light source 10 placed above it. It is reflected towards the slit diaphragm 4.

The photographing optical system P has a photographing optical axis 11 inclined with respect to the slit optical axis 8, and a photographing lens 12 and a film 13 are arranged along this optical axis 11.

In this embodiment, the photographing optical axis 11 intersects the slit optical axis 8 at an angle of 45°, and the film 13 is arranged so that the extension of its surface is orthogonal to the extension of the slit optical axis.

Further, the photographing lens 12 is arranged so that the extension of its principal plane passes through the point between the film surface and the slit surface.

The finder system F includes a reflecting mirror 14 disposed between the photographing lens 12 and the film 13.
can be moved from the operating position shown by the solid line in the figure to the retracted position shown by the chain line during imaging.

In its operating position, the reflecting mirror 14
A reflecting mirror 16 on an extension of the slit optical axis 8 reflects the light beam along an eyepiece optical axis 17 coaxial with the slit optical axis 8 .

A relay lens 18 and an eyepiece lens 19 are arranged along the eyepiece optical axis 17, and the light beam reflected by the reflector 14 first forms an image at a position 20, then is reflected by the reflector 16, and then passes through the relay lens 18. An image is formed at the position 21 and observed through the eyepiece lens 19.

In this embodiment, the relay lens 18 is arranged obliquely with respect to the optical axis 17, and its main plane 18a is located at the first
An apparent image 20 where the image 20 is transferred by the reflecting mirror 16
It is arranged so as to overlap the intersection of the extension of the plane a and the extension of the second image 21, and the second image can be formed perpendicularly to the optical axis 17.

The housing 1 is rotatably supported by bearings 22 and 23 in the lens barrel 1a of the projection lens 7 and the lens barrel 1b of the eyepiece 19.

In the embodiment shown in FIG. 2, the eyepiece optical axis 17 of the finder system F is not coaxial with the slit optical axis 8, but is eccentric by a distance that is not practical.

Therefore, in addition to the eyepiece lens barrel 1b, the housing 1 is provided with a support shaft 1C coaxially with the projection lens barrel 1a.

As explained above, according to the present invention, since the slit projection system and the photographing optical system can be rotated together around the slit axis, it is possible to photograph not only vertical cross sections but also oblique and horizontal cross sections. The rotation eliminates the possibility that the slit axis will come off the subject's eye.

Furthermore, since the eyepiece optical axis of the finder system is provided on or close to the rotation axis, the examiner does not need to move much due to rotation.

[Brief explanation of drawings]

1 and 2 are schematic sectional views showing embodiments of the present invention, respectively. S...Slit projection system, P...Photographing optical system, F...Finder system, S...
Slit axis, 17... Eyepiece optical axis.

Claims (3)

[Scope of utility model registration request] (1) A slit projection system having a slit optical axis extending approximately horizontally, a photographing optical system having a photographing optical axis inclined with respect to the slit optical axis, and a finder system having an optical axis branching from the photographing optical axis. In this eyeball crystalline lens cross-section photographing device, the slit projection system and the photographing optical system are supported so as to be integrally rotatable around the slit optical axis, and the finder system has its eyepiece optical axis aligned with the slit projection system and the photographing optical system. A crystalline lens cross-section photographing device, characterized in that it is arranged in alignment with or close to the rotation axis of the crystalline lens. (2) In the above item 1, the finder system has a reflecting mirror and a relay lens that reflect a light beam in a direction parallel to the rotation axis on or near the rotation axis, and the object image formed by the relay lens A crystalline lens cross-section photographing device that observes the crystalline lens using an eyepiece. (3) In the above item 2, the relay lens is arranged so that its principal plane is inclined with respect to the optical axis, and the image plane of the conjugate image of the first image of the subject initially formed on the finder system with respect to the reflecting mirror is such that the intersection of the extension and the extension of the image plane of the second image formed through the relay lens overlaps with the extension of the main plane of the relay lens, and the second image is formed perpendicular to the optical axis. Crystalline lens cross-section imaging device.