JPH09276227A - Slit lamp microscope with lens holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the obstruction of use of a fixation light, and also prevent a subject from having an uncomfortable feeling by attachably and detachably arranging a lens holder in the rotating center of a fixation means. SOLUTION: A front end lens member 35 is formed of a hollowed cylindrical metal frame 91, a non-spherical lens (front end lens) 92, and a presser ring 93 for fixing the non-spherical lens 92 housed within the metal frame 91. On the other hand, a lens side member 94 has a leaf spring 95 extended from the side wall of a cylindrical body 95, and the leaf spring 96 is mounted on the body 95 by a screw 97. A groove 98 having a width substantially matched to the width of the leaf spring 96 is formed on the circumference of the metal frame 91 of the front end lens member 35, and the leaf spring of the body 95 is engaged with the groove 98 of the metal frame 91, whereby the front end lens member 35 is held by the member 94. Further, a magnet 100 is fixed to one end surface of a lens holder 94, so that the lens holder 94 functions as a part of the lens holder 94 in cooperation with an iron piece 80.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slit lamp microscope, and more particularly to a slit lamp microscope provided with a lens holder for holding a front lens for observing a fundus of an eye to be examined. It is a thing.

[0002]

2. Description of the Related Art Conventionally, when a fundus of an eye to be inspected is observed using a slit lamp microscope, a non-contact type aspherical front lens may be arranged between the objective lens and the eye to be inspected. It is known. First, the configuration and operation of the slit lamp microscope and the operation of the front lens used when necessary will be briefly described with reference to FIG. 7. As shown in FIG.
The optical system of the slit lamp microscope 10 is divided into an illumination optical system 20 and an observation optical system 30. The illumination optical system 20 includes a halogen lamp 21, a lens group 22 for converting a light beam from the halogen lamp 21 into a substantially parallel light beam, and a slit (slit).
Slit diaphragm 23 and total reflection mirror 24 for forming
And so on. Further, the observation optical system 30 includes a microscope section 31 including a plurality of lens groups, and an eyepiece section 32 including a prism and an eyepiece lens.

In the slit lamp microscope 10 constructed by such an optical system, the luminous flux emitted from the halogen lamp reaches the total reflection mirror 24 through the lens group 22 and the slit diaphragm 23, and is then reflected by the total reflection mirror 24. The optical path is bent and a slit image is formed in front of the front lens. Next, the imaged light re-images a slit image on the fundus Ef of the eye E through the front lens member 35 arranged between the microscope 10 and the eye E. FIG. 8 is a diagram showing a state in which an aspherical lens is arranged between the microscope and the eye to be inspected, E is an eyeball, and Ef is a fundus.

In the slit lamp microscope, when the front lens is not arranged, the light passing through the slit diaphragm 23 is
Images on the cornea or lens. On the other hand, by appropriately disposing the aspherical lens housed in the lens member 35 in the optical path, the light emitted from the slit lamp microscope 10 forms an image on the fundus Ef of the eye E to be examined. In such a case, the reflected light from the fundus Ef of the eye E to be examined again passes through the front lens member 35 and forms an image at the focal position L1. The observer views this fundus image as the observation optical system 30 of the slit lamp microscope 10.
It becomes possible to observe through.

Generally, when observing the fundus image, the observer holds the front lens member 35 with one hand so that the observer is separated from the eye E by a certain distance (working distance) WD. It was necessary to align the pupil of the eye to be inspected with the optical axis of the aspherical lens. Further, the observer uses the other hand to align the optical axis of the light from the slit lamp microscope with the optical axes of the pupil and the aspherical lens of the eye to be inspected, and move the slit lamp microscope in the optical axis direction. I was forced to perform a very complicated operation of moving it to and observing it while focusing the fundus image.

Therefore, various lens holders have been proposed in order to simplify the above-mentioned operation and reduce the burden on the observer.

For example, as shown in FIG.
A lens holder 40 attached to one of two columns (one of which is not shown) 37 for supporting a chin rest 38, which is attached to an end portion of a base body 36 supporting the It has been known. This lens holder 4
Reference numeral 0 is composed of a ring-shaped mounting member 41 mounted on one of the columns 37 and an arm 42 extending from the mounting member 41, and the front lens member 35 can be fixed to the tip of the arm 42.

Also, as shown in FIG.
There is known a lens holder 43 attached to a forehead rest portion provided over the upper part of 7 for supporting the subject's forehead or a column connecting portion extending over the tops of the two columns 37. In the illustrated example, the lens holder 43 is composed of a mounting member 45 mounted at a predetermined position of the column connecting portion 44 and a link member 46 extending from the mounting member 45, and the front lens member is provided at the tip of the link member 46. 35 can be fixed.

With the lens holder as described above, the observer does not need to hold the front lens member by hand, and therefore the operation for observing the fundus is somewhat easy.

[0010]

However, since these lens holders are fixed to the tips of the arms and the link members by, for example, screwing, it is troublesome to remove them. Also, when using a slit lamp microscope,
A fixation lamp is often used to guide the line of sight of the eye to be examined. In general, the fixation lamp is attached via an arm to a column connecting portion 44 extending over the tops of the two columns 37 (see reference numeral 50 in FIG. 3). Therefore, there is a problem that the lens holder hinders the use of the fixation lamp due to the collision of the holder for the front lens with the fixation lamp or the arm to which the fixation lamp is attached. Further, since the fixation lamp or the arm that holds the fixation lamp, and the front lens member and the holder and the arm that hold the front lens member are located in front of the subject, there is a risk of giving the subject discomfort. There was also the problem that there was.

The present invention provides a slit lamp microscope provided with a lens holder that does not hinder the use of a fixation lamp and does not cause discomfort to a subject. To aim.

[0012]

An object of the present invention is to provide a slit lamp microscope main body, a column having a chin receiving portion for supporting the chin of a subject, and an arm rotatably attached to the column. A slit lamp microscope provided with a fixation means rotatably provided substantially at the tip of the arm, and a lens holder for holding a front lens for observing the fundus of the subject. This is achieved by a slit lamp microscope characterized in that a holder is detachably arranged at the center of rotation of the fixation means.

According to the present invention, since the lens holder is arranged at a predetermined portion of the fixation means, it is not necessary to hold the lens through the arm or the like, and the lens can be held as desired. Is possible.

Further, according to the present invention, since the lens holder holds the lens in a detachable manner, when the fixation lamp is used, it is possible to prevent the lens holder from interfering with the use of the fixation lamp.

[0015] In a preferred aspect of the present invention, the fixation means is configured to be rotatable about an axis substantially orthogonal to the optical axis of the objective lens of the slit lamp microscope body, and the lens holder is Along with the fixation means, the lens is configured to rotate around the axis to detachably hold the lens.

In a further preferred aspect of the present invention, the fixation means is configured to be movable in a direction substantially parallel to the optical axis of the objective lens of the slit lamp microscope main body, and the lens holder is fixed to the fixation lens. It is configured to move in the parallel direction together with the visual means.

According to these preferred embodiments of the present invention, the observer rotates or translates the lens to adjust the position of the lens so that the pupil of the eye to be examined and the optical axis of the lens coincide with each other. It becomes possible.

Further, in a further preferred aspect of the present invention, the lens holder has one of a metal body and a magnet, and the fixation means has another of the metal body and a magnet. There is.

According to this embodiment, it is possible to provide the fixation means with a small lens holder having a simple structure.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partial schematic cross-sectional view of a fixation lamp and an arm tip portion according to an embodiment of the present invention, and FIG. 2 is a view showing a state in which a subject undergoes an examination. In FIG. 2, the slit lamp microscope is omitted, and the subject is viewed from the slit lamp microscope side. Further, as shown in FIG. 1, the lens holder is detachably attached to the fixation lamp 50. First, the configuration of the fixation lamp 50 is shown in FIG.
And it demonstrates using FIG.

As shown in FIG. 2 (a), a fixation lamp (fixing means) 50 is fixed to a base 36 that supports a slit lamp microscope (not shown in FIG. 2), and a jaw receiving portion is fixed to the base. It is attached via an attachment member 51 and an arm 52 attached to substantially the central portion of a column connecting portion 44 that connects the two columns 37 of 39. The mounting member 51 has a thin columnar shape, and a protrusion (not shown) is provided at the center thereof so that the hole provided at the lower center of the column connecting portion 44 and the protrusion are engaged with each other. ing. As a result, the mounting member 51 and the arm 52 can rotate about the axis 51a.

As shown in FIG. 1, the fixation lamp 50 includes a main body 5
5 and a support member 56 that supports the main body 55. The main body 55 has an elongated shaft portion 60. Also,
The shaft portion 60 is hollow, and the light source 61 is fixed therein. Further, a target 62, a mirror 63, and a lens 64, which are movable in the optical axis direction, are provided in the irradiation direction of the light from the light source 61. The visual target 62 is fixed to the tip of a hollow cylindrical member 65 that is slidable inside the shaft portion 60 along the optical axis. A pin 66 is fixed to a predetermined position on the outer wall of the cylindrical member 65 and projects outward. The shaft portion 60 is provided with a groove 67 parallel to the optical axis so as to correspond to the position of the pin 66. Therefore, the pin 66 passes through the groove 67 and projects from the shaft portion 60. By moving the pin 66 along the groove 67,
The optotype 62 fixed to the cylindrical member 65 can be moved in the optical axis direction. In addition, the lens 6 of the shaft portion 60
A knob 6 having a large number of elongated grooves formed in the longitudinal direction is formed on the side opposite to the side on which the 4 is provided so that an observer can grasp it.
8 are provided.

The support portion 56 has a hollow tubular member 71 for receiving the shaft portion 70, and a second tubular member 72 rotatably engaged with the tubular member 71. The shaft portion 70 and the cylindrical member 73 fitted into the cylindrical member 71 are at a predetermined angle (for example, about 90 ° in the present embodiment) from the axis 70a of the cylindrical member 73, and from the tip of the cylindrical member 73. And a hollow member 74 that extends. By fitting the cylindrical member 73 into the tubular member 71 and engaging with the inner wall thereof, the shaft portion 70 can rotate about the axis 70a. The tubular member 71 includes a shaft portion 70.
A limit pin 75 is provided to limit excessive rotation of the.

Further, the hollow member 74 is adapted to receive the shaft portion 60 of the main body portion 55 and engage with the outer wall thereof. Therefore, the main body 55 can rotate around the axis 55a and the axis 70a.

Further, the tubular member 72 has an opening on the upper side and is fitted with the arm 52 received in the opening. Further, the tubular member 72 has a flange at its lower part,
The flange and the opening provided in the upper part of the tubular member 71 are engaged with each other. Therefore, the tubular member 7
1 can rotate around the axis 72a. A restriction pin 76 for restricting excessive rotation of the tubular member 71 is provided at the opening of the tubular member 71. Furthermore, on the outer wall of the tubular member 74 on the side opposite to the shaft portion 73,
An iron piece 80 is provided. About this iron piece 80,
It will be described in detail later.

As shown in FIG. 2A, in the present embodiment, when the chin of the subject is placed on the chin rest 38, the height of the eye and the fixation lamp 50. Support part 5
The height of 6 is almost the same.

By operating the operating rod 80,
The height of the eye can be adjusted by moving the chin receiver 38 up and down with respect to the column 37. The eye height indicates the position where the optical axis of the microscope and the optical axis of the eye substantially match. That is, the rotation center 70a of the fixation lamp 50 and both optical axes are located in the same horizontal plane.

Since the arm 52 can rotate about the axis 51a, the fixation lamp 50 can be arranged near the left eye and near the right eye.

When using the fixation lamp 50, the observer operates the arm 52 and the knob 68 to move the main body 55.
The fixation lamp 50 is arranged so that the light from the lens 64 at the tip of is projected onto the eye to be examined. In addition, the pin 66 protruding from the shaft portion 60 of the main body portion 55 is moved along the longitudinal direction of the shaft portion 60 to match the diopter of the subject,
The visual target 62 can be viewed in focus. FIG. 3 shows a state in which the fixation lamp 50 is used to project light on the left eye of the subject in this manner.

Next, the iron piece provided at a predetermined position of the fixation lamp will be described in more detail. FIG. 4 is a schematic side view of the fixation lamp 10 according to the present embodiment. As shown in FIG. 4, the end surface 81 of the hollow member 74 of the support portion 56 of the fixation lamp 50 is substantially circular and flat. Therefore, the iron piece 80 has a shape that substantially matches the shape of the end surface 81, and the end surface 81 is made of adhesive or the like.
It is fixed to. Iron piece 80 fixed to this end face 81
However, it functions as at least a part of a lens holder for detachably holding the aspherical front lens described below.

FIG. 5 is a view showing a lens holder and a fixation lamp, and FIG. 6 is a schematic sectional view of a front lens member 35 holding an aspherical front lens. As shown in FIGS. 5 and 6, the front lens member 35 includes a hollow cylindrical metal frame 9
1, aspherical lens (front lens) 92, and metal frame 9
It is composed of a retaining ring 93 for fixing the aspherical lens 92 housed inside 1. On the other hand, as shown in FIG. 5, the lens side member 94 has two leaf springs 96 extending from the side wall of the cylindrical main body 95. Leaf spring 96
Are attached to the body 95 by screws 97, respectively.

As shown in FIG. 6, a groove 98 having a width substantially matching the width of the leaf spring 96 is formed on the outer periphery of the metal frame 91 of the front lens member 35. Therefore, the body 9
The front spring member 35 is held by the member 94 by the leaf spring 5 engaging with the groove 98 of the metal frame 91.
Further, the magnet 100 is fixed to one end surface 99 of the lens holder 94 by adhesion. The lens holder 94 functions as at least a part of the lens holder in cooperation with the iron piece 80 described above.

When using the fixation lamp 50 and the front lens member 35 and the lens holder 94 configured as above, the observer fixes the lens holder 94 holding the front lens member 35. When approaching the iron piece 80 of the lamp 50, the lens holder 94 is attached to the fixation lamp 50 by the magnetic force of the magnet 100 of the lens holder 94 (see FIGS. 2B and 5). Also, the observer, as shown in FIG. 4, has working distances WA and WB.
It is possible to move the lens holder 94 attached to the fixation lamp 50 within the range defined by. Alternatively, the observer can move the lens holder 94 in a state of being separated from the fixation lamp 50, adjust the position thereof, and attach the lens holder 94 to the fixation lamp 50 at a desired position.

After the lens holder 94 is attached to the fixation lamp 50, the main body 55 is operated by the knob 68 of the fixation lamp 50 so that the fixation lamp 50 and the aspherical lens 92 are
By turning around the axis 70a (in the direction of arrow C in FIG. 4) and determining the position of the aspherical lens 92 with respect to the eye to be inspected, the harmful reflected light reflected from the lens surface of the aspherical lens 92 is reduced to some extent. It can be removed. Similarly, by rotating the fixation lamp 50 around the axis 72a and determining the position of the aspherical lens 92 with respect to the eye to be inspected, the harmful reflected light described above can be removed to some extent. .

Further, by mounting the lens holder 94 for holding the aspherical lens 92 at the center of rotation of the fixation lamp 50, the positioning of the lens with respect to the eye to be inspected can be omitted, so that the operation by the observer is easy. Becomes
When the lens holder is accurately attached to the center of rotation of the fixation lamp, one of the concave portion and the convex portion is formed on the surface of the magnet 100 of the lens holder, and the iron piece 8 of the fixation lamp is formed.
Positioning can be easily realized by forming the other of the concave portion and the convex portion on the surface of 0 and engaging the concave portion and the convex portion.

According to the present embodiment, the iron piece is attached to the supporting portion of the fixation lamp, and the magnet is provided in the lens holder to which the front lens member is attached so that the lens holder can be attached to and detached from the fixation lamp. Installed. Therefore, since the front lens member and the lens holder can be easily removed from the support portion of the fixation lamp, it is possible to prevent the operation of the fixation lamp from being hindered by the presence of the front lens member and the like. It will be possible.

Further, since the lens side and the fixation lamp side are attached by the magnetic force of the magnet, the observer can attach the lens side to the fixation lamp side.
It is attached to the fixation lamp side, or they are separated from each other so that the optical axis of the aspherical lens and the pupil of the eye to be examined coincide with each other.
Alternatively, it is possible to adjust the position of the aspherical lens so as to remove the harmful reflected light reflected from the lens surface of the aspherical lens.

Further, in the above-mentioned embodiment, since the front lens member is detachably attached to the lens holder provided with the spring, it is possible to use the conventional aspherical lens.

The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. It goes without saying that this is what is done.

For example, in the above-mentioned embodiment, the iron piece is attached to the support portion of the fixation lamp and the magnet is attached to the lens holder. However, the magnet is attached to the support portion of the fixation lamp instead of the iron piece. Alternatively, iron pieces may be provided on the lens holder.

Further, the iron piece or the magnet is not limited to being attached to the supporting portion of the fixation lamp, and the iron piece or the magnet may be attached to the body of the fixation lamp. Further, in the above-described embodiment, the iron piece is used as a member that cooperates with the magnet, but it is obvious that other magnetic material may be used.

Further, although the lens holder is held by the magnetic force in the above embodiment, the present invention is not limited to this. For example, a T-shaped groove is provided in the support portion of the fixation lamp, and the lens holder is
The lens holder may be attached to the support portion of the fixation lamp so that the lens holder can be moved in the optical axis direction of the slit lamp microscope so as to have a protrusion that engages with the V-shaped groove. . Further, even in this case, it is more preferable that the lens holder holding the aspherical lens is configured to be rotatable about an axis line orthogonal to the optical axis of the slit lamp microscope.

In the present specification, the function of one member may be realized by two or more physical members, or the function of two or more members may be realized by one physical member.

[0044]

According to the present invention, when a fixation lamp (fixation means) is used, the slit is provided with a lens holder that does not hinder the use of the fixation lamp and does not give the subject a feeling of strangeness. It is possible to provide a light microscope.

Further, by mounting the lens holder for holding the lens at the center of rotation of the fixation means, the lens can be moved by the same operation as the fixation means, which facilitates the operation by the observer. can do.

[Brief description of drawings]

FIG. 1 is a partial schematic cross-sectional view of a fixation lamp according to an embodiment of the present invention.

FIG. 2 is a diagram showing a state before the lens holder according to the present embodiment is attached to the slit lamp microscope and a state in which the lens holder is attached.

FIG. 3 is a diagram showing a state in which a fixation lamp is used to project light on the left eye of the subject.

FIG. 4 is a schematic side view of the fixation lamp according to the present embodiment.

FIG. 5 is a diagram showing a configuration of an aspherical lens and a lens holder to which the lens is attached.

FIG. 6 is a schematic sectional view of a front lens member.

FIG. 7 is a diagram showing an optical configuration of a slit lamp microscope.

FIG. 8 is a diagram showing a state in which an aspherical lens is arranged between a slit lamp microscope and an eye to be examined.

FIG. 9 is a diagram for explaining an example of a conventional lens holder for a slit lamp microscope.

FIG. 10 is a diagram for explaining another example of a conventional lens holder for a slit lamp microscope.

[Explanation of symbols]

 10 Slit lamp microscope 35 Front lens member 37 Strut 50 Fixing lamp 51 Mounting member 52 Arm 55 Fixing lamp main body 56 Support part 80 Iron piece 94 Lens holder

Claims (4)

[Claims] 1. A slit lamp microscope main body, a column having a chin receiving portion for supporting a chin of a subject, an arm rotatably attached to the column, and a pivotal portion substantially at the tip of the arm. In a slit lamp microscope provided with a fixing means which is provided so that a lens holder holds a front lens for observing a fundus of a subject, the lens holder is a rotation of the fixing means. A slit lamp microscope, which is detachably arranged in the center. 2. The fixation means is configured to be rotatable about an axis that is substantially orthogonal to the optical axis of the objective lens of the slit lamp microscope body, and the lens holder, together with the fixation means, has the axis. The slit lamp microscope according to claim 1, wherein the slit lamp microscope is configured to rotate around and hold the lens detachably. 3. The fixation means is configured to be movable in a direction substantially parallel to the optical axis of the objective lens of the slit lamp microscope main body, and the lens holder, together with the fixation means,
The slit lamp microscope according to claim 1, wherein the slit lamp microscope moves in the parallel direction. 4. The lens holder has one of a metal body and a magnet, and the fixation means has the other of the metal body and a magnet. The slit lamp microscope according to 1 above.