JPS63111835A - Slit lamp - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Use] The present invention relates to an ophthalmological slit lamp that optically cuts the anterior segment of the eye, such as the cornea and crystalline lens, with a narrow slit light. More specifically, the present invention relates to the configuration of the slit opening/closing and rotation mechanism of the slit lamp.

[Prior Art] In this type of conventional slit lamp, in order to adjust the width of the slit light projected onto the subject's eye, a pair of slit blades are provided that are moved toward and away from each other by a cam mechanism, and the distance between the slit blades is adjusted. By adjusting this using a cam mechanism, the width of the slit light projected onto the subject's eye through the slit between the slit blades was changed. In addition, in conventional slit lamps, in order to change the direction of the slit light projected onto the subject's eye, the entire lamp house with the slit mechanism is rotated, or an image rotor cheater is installed in the middle of the projection optical system. The slit direction was optically rotated by rotating the image low cheater.

[Problems to be solved by the invention] However, in conventional slit lamps, the diaphragm and various filters for adjusting the slit length were provided close to the slit blade in the projection optical path of the lamp house. However, if the entire lamp house was configured to rotate, the operation handles for the diaphragm and filter would also move with the lamp house and be placed in positions where they would be difficult to operate.

In addition, conventional devices using image-low cheetahs have the drawback that the image-low cheetah is large and its support and rotation mechanisms are complicated, which in turn increases the size of the entire illumination group.

The present invention aims to solve the drawbacks of such conventional slit lamps.

[Means for solving the problem] In order to achieve this object, the present invention provides an illumination unit that is rotatable around the slit light projection optical axis, but not in the direction of the projection optical axis. an inner cylinder that is immovably supported by the illumination section; an outer cylinder that is supported on the outer periphery of the inner cylinder so as to be rotatable about the projection optical axis and movable along the projection optical axis direction; and the projection light a pivot shaft attached to the inner cylinder perpendicularly to the axis; two slit blade supports pivotably supported on the pivot shaft; and attached to the lower ends of each of the two slit blade supports so as to face each other. a connecting rod that connects the outer cylinder and each of the slit blade supports, a slit width adjustment handle attached to the illumination unit, and a rotation of the slit width adjustment handle that is controlled by the projection light of the outer cylinder. a first transmission means for converting movement along an axis and transmitting it to the connecting rod; a slit direction rotation handle attached to the illumination unit; and a first transmission means for converting the rotation of the slit direction rotation handle into movement along the axis and transmitting the converted movement to the connecting rod; The slit lamp is characterized in that it has a second transmission means for transmitting the rotation so that these rotate integrally about the axis.

[Function] According to such a configuration, when the slit width adjustment handle is operated, this operation is transmitted to the outer cylinder via the first transmission means, and the outer cylinder is moved along the projection optical axis. The slitting blade supports are each pivoted about the pivot axis via the connecting rod, and the spacing between the slitting blades is widened.

Further, when the slit direction rotation handle is operated to change the slit direction, this operation is transmitted to the outer cylinder and the inner cylinder via the second transmission means.

As a result, the outer cylinder and the inner cylinder are rotated together, and the slit blades indirectly attached to the outer cylinder and the inner cylinder are also rotated, changing the direction of the slit.

[Example] In FIG. 1, the illumination section 1 of the slit lamp is rotatably supported by the pivot support shaft 3 of the microscope section 2. A light source 4 and a condenser lens 5 for condensing the light from the light source 4 are disposed at the lower end of the illumination section 1, and near the top of the condenser lens 5 in the illumination section 1, the light from the condenser lens 5 is disposed. Slit blades 5a and 5b for slit light
A projection lens 6 is disposed on the upper part of the illumination part 1, and a reflection prism 7 is attached to the upper end of the illumination part 1 for reflecting and projecting the slit light from the projection lens 6 onto the eye E. ing.

A housing part 8 is formed in the middle part of this illumination part 1,
An inner cylinder 10 is mounted in the housing 8 so as to be rotatable about the projection optical axis 0. Further, a flange 11 is formed at the lower end of the inner cylinder lO, and this flange 11 is held between a stepped portion 8a within the housing portion 8 and a presser ring 9 fixed within the housing portion 8. As a result, the inner cylinder 10 is prevented from moving along the projection optical axis 0 inside the housing section 8 (movement in the vertical direction in the figure), but it is still able to rotate about the projection optical axis 0 as the rotation axis. It seems possible to do this.

Furthermore, an outer @i20 is fitted onto the outside of the inner cylinder 10 so that it can rotate about the projection optical axis O and move in the direction in which the projection light I'1IO extends (vertical direction in the figure). has been done. Furthermore, a pivot shaft 13.13 is attached to the lower surface of the flange 11 of the inner cylinder 10 with screws 12.12 so that its axis is orthogonal to the projection optical axis 0.

These pivot shafts 13.13 are rotatably disposed between semicircular bearings 14a, 14a provided at opposing upper ends of a semicylindrical body 14.14 serving as a slitting blade support.

Furthermore, slit blades 5a and 5b are attached to the lower surfaces of the two semi-cylindrical bodies 14 and 14, respectively, so as to face each other. A side surface of the semi-cylindrical body 14.14 is provided with a slit blade 5a in order to obtain a clamping force to the pivot shaft 13.13 of the bearing portions 14a, 14a of the semi-cylindrical bodies 14, 14.
, 5b is fitted with a U-shaped spring 15.15 to act to keep it closed at all times.

As shown in FIG. 2, the upper part of the semi-cylindrical body 14.14 is provided with an outer flange 16.16.
．． 16 has a slot 16 extending in a direction perpendicular to the optical axis 0.
a, 16a is formed in which the slot 16a, 16a has a connection n1 with a conical head 17a, 17a at the lower end.
7°17 is inserted. These connecting rods 17, 17 are connected to shaft insertion holes 18, 1g formed in the flange 11 of the inner cylinder 10.
The upper ends of the connecting rods 17, 17 further pass through shaft insertion holes 22.degree. 22 formed in the lower flange 21 of the outer cylinder 20. And connecting rods 17, 17
A locking nut 19, 19 is screwed onto the upper end of each. Here, the retaining nuts 19, 19 are inserted, for example, between the outer peripheral surface of the outer cylinder 20 and the inner peripheral surface of the presser ring 9 so that they cannot rotate after being screwed onto the connecting rods 17, 17. On the other hand, the tops of the connecting rods 17, 17 are formed as screw heads that can be engaged with, for example, a flathead screwdriver, and
Connecting rod 1 with a screwdriver through adjustment hole 8d formed in
By rotating 7 and 17 and moving them forward and backward with respect to the locking nut 19.19, the semi-cylindrical body 14.14 can be slightly rotated around the rotation axis 13.13, and the slit and the optical axis O can be rotated slightly. Matching adjustments can be easily made from outside the device.

As shown in FIGS. 1 and 6, a shaft body 30 extending in a direction parallel to an axis perpendicular to the projection optical axis 0 is rotatably supported on the housing portion 8. As shown in FIGS. At both ends of this shaft body 30, as shown in FIG.
(only one handle disclosed) is fixed. Further, an eccentric shaft portion 32 eccentric from the rotation axis 01 is provided at the center of the shaft body 30. A lower end 33a of a shaft 33 mounted on the housing 8 so as to be movable in a direction parallel to the projection optical axis O, that is, in an up-down direction, is in contact with the circumferential surface of the eccentric shaft part 32. A pin 34 is implanted in the upper side surface of the shaft 33, and a roller 35 is rotatably fixed to the tip of the pin 34. Moreover, this roller 35 is
Contacting the lower surface of the upper flange 23 of the outer cylinder 20, the outer cylinder 2
It supports 0. Further, the intermediate portion of the pin 34 passes through a slot 8c formed in the housing portion 8, and is prevented from turning around the shaft 33. This shaft body 30. Eccentric shaft portion 32
．． Shaft 33. Pin 34. Roller 35. The upper flange 23 and the like constitute a first transmission means that transmits the rotation of the slit width adjustment handle 31 to the outer cylinder 20 as a vertical displacement.

As shown in FIG. 1, a slot 24 parallel to the optical axis 0 is formed on the upper side surface of the outer cylinder 20, and a pin 25 passing through the slot 24 is implanted on the outer surface of the inner cylinder 10. Further, as shown in FIG. 3, the pin 25 passes through a notched slot portion 8b formed in the housing portion 8 over half a circumference.

The slit direction adjustment handle 40 is rotatably attached to the illumination unit 1 with the projection optical axis 0 as a rotation axis, and the tip of the pin 25 is fitted into a cutout slot 41 formed in the slit direction adjustment handle 40. ing. This slot 2
4. The pin 25 constitutes a second transmission means that transmits the rotation of the slit direction adjustment handle 40 to the inner cylinder 10 and the outer cylinder 20.

A diaphragm plate 50 is disposed between the slit blades 5a, 5b and the condenser lens 5. This aperture plate 50 is.

As shown in FIG. 4, a plurality of apertures 51 with different diameters
a, 51b, 51c, 51d, and 51e, and is horizontally rotatably attached to the illumination part l with a single-stage screw 52. Moreover, the aperture plate 50 is
By operating 0a, the stepped screw 52 can be rotated about the axis 08. Further, below the diaphragm plate 50, a filter plate 55 shown in FIG. 5 is supported so as to horizontally rotate about a stepped screw 52 as a rotation axis. This filter plate 55
has a transparent opening 56, an N[) filter 57a,
Non-red filter 57b and blue filter 57c
is provided. A gear 58 is integrally provided at the bottom of this filter plate 55, and this gear 58 has a sector-shaped gear 5.
9 are meshed with each other, and a filter switching handle 60 is integrally provided on the support shaft 59a of this fan-shaped gear 59. Therefore, by operating the filter switching handle 60 and rotating the fan-shaped gear 59 around the axis 03, the gear 58
is rotated, the filter plate 55 is rotated together with the gear 58, and any one of the filters 57a to 57c is selectively inserted into the projection optical path.

Next, the operation of the slit adjustment mechanism having the above configuration will be explained.

First, to adjust the slit length, use the handle portion 5 of the aperture plate 50.
0a to rotate the diaphragm plate 50 around the axis 02, select one of the diaphragm apertures 51a to 51e with a desired diameter, and insert it into the projection optical path.

Also, to adjust the slit width, use the slit width adjustment handle 3.
Operate 1. This rotational operation rotates the shaft body 30 and turns the eccentric shaft portion 32 around the axis 01, thereby causing the shaft 33 to move up and down. When the shaft 33 moves upward, the roller 35 rises accordingly, and the upper flange 23 in contact with the roller 35 rises, so that the outer cylinder 20 rises. This rise of the outer cylinder 20 is caused by the connecting rod 17.
17 and engaged with the semi-cylindrical body 14.
The lower end of the U-shaped spring 15.14 rotates around the pivot axis 13.13.
The slit blade 5a rotates outward against the elastic force of 15.
, open the interval 5b.

On the other hand, when the slit width adjustment handle 31 is rotated in the opposite direction, the shaft 33 is lowered, so that the semi-cylindrical body 14.
The lower end of the semi-cylindrical body pivots inward due to the elastic pressure (spring force) of the U-shaped spring 15.15 to close the slit blades 5a and 5b, and the pivoting of this semi-cylindrical body causes the outer wJ20 to be opened via the connecting rod 17.17. Pull down.

Further, the slit direction can be adjusted by turning the slit direction adjustment handle 40, and when the slit direction adjustment handle 40 is turned, the pin 25 engaged with the slot 41 is rotated around the optical axis 0. . This pin 2
5 rotates the outer cylinder 20 that engages with the slot 24 and the inner cylinder 10 in which the pin 25 is implanted so that the optical axis 0 is rotated.
Rotate around. As a result.

The inner cylinder 10 is rotated by a pivot shaft 13°1 fixed thereto.
3, the semi-cylindrical bodies 14, 14 are rotated around the optical axis 0, thereby rotating the slit blades 5a, 5b and changing the slit direction. Also, at this time, the outer cylinder 2
Since the slit 0 rotates at a constant height on the roller 35 by its flange 23, the slit width does not change.

Fig. 7 shows a second embodiment of the present invention, in which the slit direction adjustment handle 40 in the first embodiment can be operated by an operating section coaxial with the slit width adjustment handle 31. Components similar to those in the first embodiment are given the same reference numerals to avoid redundant explanation.

A slit direction adjustment handle 70°7 is provided on the outer periphery of the shaft body 30.
A cylinder shaft 71.71 having a diameter of 0 is rotatably inserted. Bevel gears 72, 72 are provided at the ends of the cylinder shafts 71, 71, and the bevel gears 72.72 are connected to the shaft 73.7.
It meshes with bevel gears 74, 74 provided at the lower end of 3.

In addition, a gear 75 formed at the upper end of the shaft 73.73
゜75 is the slit direction adjustment handle 40 of the first embodiment.
It meshes with a gear 76 formed on the outer periphery of the slit direction adjustment ring 40' corresponding to the slit direction adjusting ring 40'. With this configuration, when the slit direction adjustment handle 70 is rotated, the bevel gears 72, 7
4. Shaft 73. The slit direction adjustment ring 40' is rotated via the gears 75 and 76, and the slit blades 5a and 5b are then rotated in the same manner as in the first embodiment.

The slit direction can be changed.

In this embodiment, the cylinder shaft 71. Bevel gear, shaft 73° Bevel gear 74. The gears 75 and 76, the slit direction adjustment ring 40', the above-mentioned pin 25, and the slot 24 control the rotation of the slit direction adjustment handle 70 between the inner cylinder 10 and the outer cylinder 20.
It constitutes a second transmission means for transmitting to.

11 Figure 8 shows a modification of the second embodiment. In this embodiment, a bevel gear 80 rotates around a rotating shaft 81.
By meshing with bevel gears 72.72, the slit direction adjustment ring 40' can be rotated by rotating either the left or right slit direction adjustment handle 70.70 with a single shaft 73 having a bevel gear 74. It is.

1 Househusband Niwatoshi FIG. 9 shows a further improvement of the third embodiment.

In this embodiment, the rotating shaft 81 of the bevel gear 80 is connected to the shaft 3.
The shaft 33 is coaxial with the shaft 33 and rotatably held by the bearing 8e of the housing 8, and the shaft 33 is fitted into the shaft hole 83 of the rotating shaft 81 so as to be slidable up and down.
2, and this gear 82 is connected to the slit direction adjusting ring 40'.
The structure is such that the gears 76 mesh with each other.

[Effects of the Invention] According to the present invention configured as described above, the slit direction can be changed without using an image low cheater, so the illumination area of the slit lamp does not increase in size, and the conventional There is no need to rotate the interior of the lighting unit to change the slit direction, and the diaphragm and filter switching handles do not need to be moved, making it easy to operate.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a first embodiment of a slit lamp according to the present invention. FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1. FIG. 3 is a sectional view taken along the line ■-■ in FIG. 1. FIG. 4 is a plan view of the aperture plate shown in FIG. 1. FIG. 5 is a plan view of the filter plate shown in FIG. 1. FIG. 6 is a sectional view showing the structure of the slit width adjustment handle shown in FIG. 1. FIG. 7 is an explanatory diagram of an adjustment handle showing a second embodiment of the slit lamp according to the present invention. FIG. 8 is an explanatory diagram of an adjustment mechanism showing a third embodiment of the present invention. FIG. 9 is an explanatory diagram of an adjustment mechanism showing a fourth embodiment of the present invention. 1... Lighting parts 5a, 5b... Slit blade IO... Inner tube 13... Rotating shaft 14... Semi-cylindrical body (slit blade support) 17... Connecting rod 20... Outside Cylinder 31...Slit width adjustment handle 35...Roller No.41...Slot

Claims (1)

[Scope of Claims] An inner cylinder rotatable about the slit light projection optical axis of the illumination part but supported by the illumination part immovably in the direction of the projection optical axis; and an inner cylinder rotatable about the projection optical axis. an outer cylinder supported on the outer periphery of the inner cylinder so as to be movable and movable along the direction of the projection optical axis; a rotation axis attached to the inner cylinder perpendicular to the projection optical axis; two slit blade supports that are supported such that they can be supported; slit blades that are attached to the lower ends of each of the two slit blade supports to face each other; and connect the outer cylinder and each of the slit blade supports. a connecting rod, a slit width adjustment handle attached to the illumination section, and a first transmission means for converting rotation of the slit width adjustment handle into movement of the outer tube along the projection optical axis and transmitting the same to the connecting rod. a slit-direction rotation handle attached to the illumination unit; and a first member configured to transmit the rotation of the slit-direction rotation handle to the inner cylinder and the outer cylinder so that they rotate integrally around the axis. 2. A slit lamp comprising: 2 transmission means.