JPS5927565B2 - Crystalline lens cross-section imaging device - Google Patents

Description

[Detailed description of the invention] The present invention relates to an apparatus for photographing a cross section of a crystalline lens of the human eye.

2. Description of the Related Art A crystalline lens cross-section imaging device is known that illuminates the crystalline lens of the human eye with a slit and photographs the slit-illuminated cross section from a direction oblique to the slit plane.

It is also known that in such a device, in order to obtain a sharp and focused image over the entire cross section, the slit surface, the photographic film surface, and the extension of the principal surface of the photographic lens intersect at the same position. .

The present invention provides such a crystalline lens cross-section photographing device that can photograph not only vertical cross-sections but also all cross-sections such as inclined cross-sections and horizontal cross-sections.

That is, the crystalline lens cross-section photographing device according to the present invention is characterized in that the slit projection system and the photographing optical system are arranged so as to be rotatable around the slit optical axis as a unit, and the slit projection system is rotated around the slit optical axis. Because of the rotation, even if the slit projection system is rotated to change the angular orientation of the slit cross section, the slit illumination will not deviate from the pupil of the subject's eye, and various different cross sections can be continuously viewed. Can be easily photographed.

Another feature of the device of the present invention is that the rotation angle of the slit projection system can be automatically projected onto the film plane, and with this arrangement, the position can be displayed at the same time as the crystalline lens cross section is taken. I can do it.

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 that realizes the idea of the present invention includes a slit projection system S and a photographing optical system P, which are housed in a housing 1.

The slit projection 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 80 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 provided in the projection lens barrel 2.
is located.

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 11 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.

The housing 1 is supported by a support frame 21 through 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 projected slit light beam 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 as to be perpendicular to the extension surface of the film 26 or the slit light flux surface including the slit optical axis, that is, the extension of the slit surface, and the extension of the main plane 23a of the photographing lens 23 is perpendicular to the extension surface of the film 26 and the slit surface. It is arranged to include the line of intersection with the extension of .

The finder system has a reflecting mirror 2γ 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. Yes, and is moved from the solid line reflection position to the retracted position, for example, due to the necessity of interlocking with the shutter release mechanism of the camera.

On the reflection optical axis of the reflection mirror 270 at the reflection position, there is provided a reflection mirror 28 that 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 beam passing through the photographing lens 23 is reflected by the reflecting mirror 2γ, 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 example, the first slit cross-sectional image 31 is an apparent first image 31 transferred by the reflecting mirror 28.
Since the main plane 29 of the relay lens 29 is arranged so that the extension of a overlaps the line of intersection between the plane containing a and the plane containing the second slit cross-sectional image 32, the first image is tilted to the optical axis. Even when the second image is formed perpendicularly to the optical axis, the entire image plane can be focused.

Therefore, according to this finder system, the first slit cross-sectional image can be observed as an aerial image, and the finder system can be brighter than when using a focus plate.

The photographic optical system P in this example has a tilt angle of 45° and a photographic magnification of 1.
The S photographing lens 23, which is a double tilt optical system, is positioned so that the slit cross-sectional image is formed on the film 26 in a substantially focused state when the apparatus is assembled.

For more fine focus adjustment, the photographing lens 23 is mounted so as to be moved in a direction perpendicular to the optical axis.

That is, the lens barrel 22 has a cylindrical shape whose outer surface is slightly eccentric from the imaging optical axis 25, and by rotating the lens barrel 22, the lens 23 is moved in a direction perpendicular to the optical axis to adjust the focus. I can do it.

According to this arrangement, the focus adjustment mechanism can be greatly simplified compared to an arrangement in which the photographing lens 23 is moved in the optical axis direction.

The crystalline lens cross-section photographing apparatus of this example 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 on the housing 1 so as to be pivotable about an axis 34.

The shielding member 35 has a distal end shielding part 35a and a rear extension part 35b for shielding a part of the projection light beam from the projection lens 3, and the rear extension part 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 in a retracted position where it does not block the projection light beam from the lens 3.

A solenoid 37 is disposed corresponding to the end of the rear extension 35b of the shielding member 35, and the actuator 3 of the solenoid 37
7a, when the solenoid is energized during imaging, it projects in the direction of the arrow and pushes the member 35 counterclockwise;
A is made to 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.

Referring to FIG. 2, of the light beam projected through the second slit diaphragm 33 in front of the slit projection lens 3, the portion that deviates to the side opposite to the photographing lens 23 is located on the corneal surface as shown by a in FIG. Since the light is further reflected outward, it does not enter the photographic lens 23.

On the other hand, there is a possibility that the reflected light on the cornea of the light beam that deviates toward the photographic lens 23 side may enter the photographic lens.
By blocking the light beam 5a, it is possible to prevent the corneal reflected light flux from entering the photographing optical path during photographing.

In this embodiment, activating the shielding member 35 only during photographing brings yet another advantage.

That is, in FIG. 3, when the slit projection optical axis 17 is deviated from the optical axis of the eye, the light source image 40 formed in the crystalline lens 39 of the eyeball E is deviated from the optical axis of the eye as shown by 40a. It is located in the same position.

Therefore, alignment can be adjusted using the position of this light source image 40.

During photographing, this light source image can be removed by projecting the tip 35a of the shielding member 35 into the projection optical path.

The crystalline lens cross-section photographing apparatus of the embodiment shown in FIG. 1 further includes a data projection system 41. As shown in FIG.

As shown in FIG. 4, this data projection system 41 includes four reflecting mirrors 42 and 434 that reflect light from the photographing light source 10.
4.45, in which a data card 47 is mounted between reflectors 44.45.
can be inserted.

That is, as shown in FIG. 5, a guide flange 48 is attached to one side of an opening 46a provided in the casing 46, and a presser plate spring 49 is provided on the opposite side, thereby forming an insertion passage for a data card 47. .

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

The data card 47 consists of a card plate 4γa and a support portion 47b, and a flange 48 and a presser plate spring 4 on the support portion 47b.
A guide surface that engages with 9 is formed.

On the card board 47a, data such as the subject's name, right eye or left eye, date of examination, etc. are written.

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

An angle display index plate 52 is attached to the casing 46 so that the upper part thereof corresponds to the window hole 51 of the plate material 100.

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 indicator plate 52 is rotatably mounted around an axis 54 substantially parallel to the slit optical axis 17 and has an eccentric center of gravity, so that it maintains a constant posture even when the housing 1 is rotated.

Therefore, an angular scale corresponding to the rotation angle of the housing 10 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.

Although the embodiment of the present invention has been described in detail above and it has been shown that the structure of this embodiment includes various excellent features, the present invention is not limited to the details of such embodiment. It includes a slit projection system and a photographing optical system, and the photographing lens of the photographing optical system is arranged so that the extension of its principal plane includes the intersection line of the extension of the slit surface and the extension of the film surface. In the crystalline lens cross-section photographing apparatus described above, the present invention includes all structures in which the slit projection system and the photographing optical system can be integrally rotated around the slit optical axis.

With this arrangement of the present invention, it is possible to photograph a cross section of the crystalline lens in any direction, and there is no fear that the slit optical axis will deviate from the eye even when the slit projection system is rotated.

Furthermore, according to another feature of the present invention, the rotation angle of the slit surface can be easily projected onto the film surface, which is convenient.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a sectional view of a crystalline lens cross-section photographing device showing an embodiment of the present invention, Fig. 2 is an explanatory diagram showing the action of a reflected light shielding device adopted in this embodiment, and Fig. 3 is an explanatory diagram showing another effect of the reflected light shielding device, FIG. 4 is a sectional view showing details of the data projection system, and FIG. 5 is a sectional view taken along the line V-V in FIG. 4.
FIG. 6 is a view taken along the line Vl-v'i in FIG. 4. 1... Housing, 3... Projection lens, 6... Illumination light source, 1... Slit,
10... Light source for photography, 17... Slit optical axis, 23... Photography lens, 26...
・Film, 27...Reflector, 30...
・Eyepiece lens.

Claims (1)

[Scope of Claims] 1. A crystalline lens cross-section photographing device including a slit projection system and a photographing optical system having an optical axis inclined with respect to the slit optical axis of the slit projection system, wherein the slit projection system and the photographing optical system include: The slit is configured so that it can be rotated integrally around the optical axis of the slit arranged approximately horizontally, and
A crystalline lens cross-section device characterized in that it has an angle index indicating the rotation angle of the two optical systems, and further includes an optical system for projecting the angle index onto a film surface. 2. The crystalline lens cross-section photographing device according to item 1, wherein the angle index comprises a rotating body that is supported around an axis substantially parallel to the rotation axis of the photographing optical system and maintains a constant posture at all times due to an eccentric center of gravity. 3. The crystalline lens cross-section imaging device according to item 2 above, wherein the rotating body of the angle index is a transparent disk at least in the scale portion. 4. The crystalline lens cross-section imaging device according to item 2 above, wherein the angle index projection optical system can also project other data onto the film surface.