JPS5850889Y2 - Eye lens cross-section imaging device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an apparatus for photographing a cross section of a crystalline lens of an eyeball.

A cross-sectional photograph of the crystalline lens taken with such a device is
It is used to judge the disease inside the eyeball, but for that judgment,
The lens density in cross-sectional photographs is an important factor.

Therefore, in order to objectively judge the photographing conditions, development, and printing conditions without being affected by the photographing conditions, it is desirable to project a density scale on the photograph.

Accordingly, an object of the present invention is to provide a crystalline lens cross-sectional photographing apparatus having means for projecting a density scale onto a film under the same photographing conditions as cross-sectional photographs.

That is, the device of the present invention is capable of handling data including a concentration scale.
It has a data projection system that projects the sunset onto photographic film,
Moreover, this data projection system uses the light from the photographing light source to perform data projection, so even if there is a change in the density of the lens cross section due to changes in the amount of light emitted from the photographing light source, etc. Since the density scale also varies by a corresponding amount, the results of comparative diagnosis are not affected by the imaging conditions.

An embodiment of the present invention will be described below with reference to the drawings.

The crystalline lens cross-section photographing device shown in FIG. 1 includes a slit illumination system S and a photographing optical system P, which are connected to a housing 1.
is housed within.

The slit illumination system S includes a lens barrel 2 fixed to a housing 1.
projection lens 3, reflecting mirrors 4, 5, and observation light source 6
A slit 7 is arranged between the light source 6 and the reflecting mirror 5.

Further, a reflector 8 is disposed between the slit 7 and the light source 6 so as to be able to rotate around an axis 9, and can be moved between a non-operating position indicated by a solid line in the figure and an operating position indicated by an imaginary line. It looks like this.

A photography illumination light source 10 such as a xenon lamp is arranged on the reflection optical axis of the reflecting mirror 8 in the operating position.

An actuation lever 11 is provided as a mechanism for moving the reflector 8 between its activated and non-activated positions.

Furthermore, a second slit diaphragm 33 is arranged in the projection lens barrel 2 .

The actuating lever 11 is arranged so as to be pivotable about an axis 12, and a groove 13 at its tip engages with a pin 15 provided on an extension of the support frame 14 of the reflector 8.

A solenoid 16 is arranged corresponding to the end of the operating lever 11, and when excited during photographing, the solenoid 16 pushes the end of the operating lever 11 in the direction of the arrow to move the reflector 8 to the operating position shown by the imaginary line.

The optical axis 17 of the projection lens 3 constitutes a slit optical axis, and a hollow cylindrical support shaft 18 is attached to the rear of the housing 1 coaxially with this slit optical axis.

In this embodiment, the housing 1 is supported by a support frame 21 via bearings 19 and 20 at its lens barrel 2 and support shaft 18 .

Therefore, the housing 1 can be rotated around the optical axis of the projection lens 3, that is, the slit optical axis, and the slit to be projected can also be rotated around the optical axis.

Further, the support frame 21 is attached to a frame movable in the front and rear, left and right, and up and down directions.

This is necessary for alignment operation to match the optical axis of the eye to be examined and the optical axis of the slit.

The photographic optical system P includes a photographic lens 2 housed in a lens barrel 22.
3, and the lens barrel 22 is rotatably supported by a camera housing 24 fixed to the housing 1.

In this example, the optical axis 25 of the photographic lens 23 intersects the slit optical axis 17 at an angle of 45°, and a film 26 is provided in the camera housing 24 on the extension of the photographic optical axis 25.
is located.

The film 26 is arranged so that its extended surface is perpendicular to the extension of the slit optical axis, and the photographing lens 23 is arranged so that its principal plane 23a extends at the intersection of the extended surface of the film 26 and the slit optical axis. It is placed so that it can pass through.

With this configuration, the entire slit surface can be brought into focus on the film 26.

The finder system has a reflecting mirror 27 provided between the photographic lens 23 and the film 26, and this reflecting mirror 27 is movable between a reflecting position shown by a solid line in the figure and a retracted position shown by an imaginary line. For example, it is moved from the reflection position shown by the solid line to the retracted position by a device that works with the shutter release mechanism of the camera.

On the reflection optical axis of the reflection mirror 27 at the reflection position, a reflection mirror 28 is provided which directs the light beam from the photographing lens 23 almost parallel to the slit optical axis 17 and toward the rear, and a relay lens is provided along the reflection optical axis. 29 and an eyepiece 30 are arranged.

The light flux passing through the photographing lens 23 is reflected by the reflecting mirror 27 and forms a slit cross-sectional image at 31.

The light beam from this image further passes through a reflecting mirror 28 and a relay lens 29, forms an image at a position 32, and is observed by an eyepiece 30.

In the finder system of this embodiment, the first slit cross-sectional image 31 is located at the intersection line between the plane containing the apparent first image 31a transferred by the reflecting mirror 28 and the plane containing the second slit cross-sectional image 32. Since the extensions of the main planes 29a of the relay lenses 29 are arranged so as to overlap, the second image is formed with the entire image in focus on a plane perpendicular to the optical axis.

The crystalline lens cross-section photographing apparatus of this embodiment further includes means for preventing the reflected light flux from the corneal surface from entering the photographing optical system during photographing.

This means has a shielding member 35 mounted pivotably about an axis 34 on the housing 1 .

The shielding member 35 includes a tip shielding portion 35a and a rear extension portion 35 for blocking a portion of the projection light beam from the projection lens 3.
The rear extension portion 35b is biased downward by a spring 36.

Therefore, the member 35 is normally biased clockwise around the shaft 34, and its tip 35a is held at the l/bow 1 position without blocking the projection light beam from the lens 3.

A solenoid 37 is disposed corresponding to the end of the rear extension part 35b of the shielding member 35, and the actuator 37a of the solenoid 37 projects in the direction of the arrow when the solenoid is energized during photographing, and rotates part 435 counterclockwise. direction to make the tip shielding part 35a protrude into the slit projection optical path.

An adjustment cam 38 is provided on the side opposite to the solenoid 37 with respect to the shielding member extension 35b, and this cam 38 determines the protruding position of the tip shielding portion 35a of the member 35 into the slit projection optical path.

The crystalline lens cross-section photographing apparatus according to the embodiment shown in FIG. 1 further includes a data projection system 41 that realizes the idea of the present invention.

As shown in FIG. 2, this data projection system 41 includes four reflecting mirrors 42, 43,
44.45, in which a data card 4 is inserted between reflectors 44.45.
7 can be inserted.

That is, as shown in FIG. 3, a guide flange 48 is attached to one side of an opening 46a provided in the casing 46, and a retaining leaf spring 49 is provided to the opposite side, thereby forming an insertion passage for a data card 47. be done.

A plate material 100 having a transparent portion 49,50 and a window hole 51 for angle display is fixed to the casing 46, and this plate material 100
A data card 47 is arranged so as to be freely inserted and removed facing the transparent portion 50 of the device.

The data card 47 includes a card board 47a and a support portion 47.
A guide surface that engages with the flange 48 and the presser plate spring 49 is formed on the support portion 47b.

In addition to the concentration scale, data such as the subject's name, right eye or left eye, and date of examination are written on the card material 47a.

In this embodiment, a density scale is arranged in the transparent part 49.

The casing 46 has a window hole 5 in the upper part of which is a guide plate 47a.
An angle display indicator plate 52 is attached to correspond to 1.

The indicator plate 52 has a transparent part 52 with an angle scale written on the upper half.
a, and a weight 53 at the bottom.

The index plate 52 is rotatably mounted on an axis 54 that is substantially parallel to the slit optical axis 17, and is therefore attached to the housing 1.
maintains a constant posture even when rotated.

Therefore, an angular scale corresponding to the rotation angle of the housing 1 appears in the window hole 51 of the plate material 100.

A projection lens 55 is provided at the tip of the casing 46,
Each piece of data on the plate material 100 is projected by light from the photographing light source 10 through the projection lens 55.

In this example, a reflector 27 of a finder system receives this data projection light beam at a retracted position for photographing and reflects it toward the film 26.

FIG. 5 shows an example of a photograph taken by the device of the present invention.
, density scale 56b, and other photographic data 56C
and angle scale 56d are shown.

Particularly in this example, the density scales 56b are arranged in the extension direction of the axis of the cross-section of the eyeball, and when reading the photograph mechanically with a density discriminator, for example, the reading can be done simply by moving the photograph in the direction of the axis of the cross-section of the eyeball. It is convenient because it can be done.

As explained above, according to the device of the present invention, it is possible to imprint the density scale under the same conditions as those for photographing cross-sections of the eyeball, so it is extremely effective in diagnosing diseases within the crystalline lens, and it is also possible to improve the timing of photographing. It will also be possible to easily determine the progress of the disease by comparing different photos.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an ocular lens cross-sectional imaging device showing an embodiment of the present invention, FIG. 2 is a cross-sectional view showing details of a data projection system, FIG. 3 is a cross-sectional view taken along the line III--III in FIG. FIG. 4 is a cross-sectional view taken along the line IV--IV in FIG. 2. FIG. 5 is a schematic diagram showing an example of a photograph taken by the apparatus of the present invention. 1... Housing, 3... Projection lens, 6... Illumination light source, 7... Slit,
10... Light source for photography, 17... Slit optical axis, 23... Photography lens, 26...
・Film, 47... Data card, 56b
...Concentration scale.

Claims (1)

[Scope of utility model registration request] In an eyeball lens cross-section photographing device comprising a slit projection system including a photographing light source and a photographing optical system for taking a photograph from an oblique angle of the projection slit surface projected by the slit projection system, data including at least a density scale is recorded on a photographing film. 1. A crystalline lens cross-section photographing apparatus characterized in that a data projection system for projecting data onto the lens is provided, and the data projection system performs data photographing using light from the photographing light source.