JPH0342886Y2 - - Google Patents

Description

[Detailed description of the invention] Purpose of the invention (industrial application field) The present invention relates to a measuring force testing device for a non-contact tonometer that can precisely test the measuring force of a non-contact tonometer. be.

(Prior Art) Conventionally, a non-contact tonometer measuring force testing device having a configuration as shown in FIG. 5 has been known. In this FIG. 5, 1 is a base, a support 2 is installed on this base 1, an alignment lens 3 corresponding to the eye to be examined is attached to the support 2, and the alignment lens 3 is attached to the support 2. A crosshair 4 is provided. The alignment of the non-contact tonometer is adjusted using the alignment lens 3,
5 is an objective lens holder that constitutes a part of the non-contact tonometer, 6 is a nozzle that emits an air pulse as a fluid pulse, 7 is a light emitting device of the non-contact tonometer, and 8 is the non-contact tonometer. It is a light receiver.

To test the measuring force of a non-contact tonometer using this conventional non-contact tonometer measuring force test device, after adjusting the alignment, the non-contact tonometer is moved in parallel by a distance A. This is done by letting
A plane mirror 9 to which an air pulse is blown is provided at the parallel movement position, and the plane mirror 9 is provided at the tip of a needle bar 11 that constitutes a part of the twist take-up 10. The needle bar 11 is attached to a pivot shaft 12. It is being

When the plane mirror 9 is blown with an air pulse, it rotates in the direction of arrow B based on its pivot axis 12,
When the plane mirror 9 is perpendicular to the optical axis l of the objective lens, the amount of parallel light emitted from the emitter 7 and reflected by the plane mirror 9 received by the receiver 8 becomes maximum. The pressure as the measuring force of the non-contact tonometer is tested by. In addition, in this FIG. 5, 13 is a helical spring,
14 is a rotation adjustment knob for adjusting the spring force of the helical spring 13, 15 is a control balance, and 16 is a stopper screw.

(Problems to be Solved by the Invention) However, in this conventional non-contact tonometer measurement force testing device, after the non-contact tonometer is aligned, the non-contact tonometer is moved to a plane mirror 9.
The parallel movement operation is troublesome because it is necessary to perform parallel movement to the position where .
Positioning with respect to the plane mirror 9 at that parallel movement position is difficult. Furthermore, there is a problem that the parallel movement may cause an error in the measurement force test.

Structure of the invention (Means for solving the problems) The present invention has been made in consideration of the above-mentioned circumstances. A lens for alignment and a plane mirror are integrally configured, and the measuring force of the non-contact tonometer can be tested without having to move the non-contact tonometer in parallel between the lens for alignment and the plane mirror.

(Example) Fig. 3 is a diagram showing a schematic configuration of a measuring force testing device for a non-contact tonometer according to the present invention, and the configuration will be explained while assigning the same reference numerals to the same components as in the prior art. I decided to.

The nozzle 6 of the non-contact tonometer has a lens mirror body 1 consisting of a plane mirror 9 and an alignment lens 3.
The plane mirror 9 has a cylindrical shape as shown in FIGS. 1 and 2, and the side facing the nozzle 6 is a mirror surface 9a. A through hole 9b is formed in the center of the plane mirror 9, and the alignment lens 3 is fitted into the through hole 9b and integrated into the lens mirror body 17 to form a lens mirror body 17.

This lens mirror body 17 is fixed to the tip of the needle bar 11. When the lens mirror body 17 is in a rest state, the inclination angle α of the needle bar 11 with respect to the axis l' perpendicular to the axis l of the objective lens is set to about 2 degrees, and the adjustment of the inclination angle α is as follows. This is done using the stopper screw 16. When the lens mirror body 17 is in a rest state, parallel light rays emitted from the light emitter 7 and reflected by the plane mirror 9 are not received by the light receiver 8.

The spring force of the helical spring 13 is tested by moving the control balance 15 in the + direction, and its sensitivity is said to be 1 mg or more. A ball 15b is provided on the arm 15a, and when the arm 15a is moved in the + direction, the ball 15b is attached to the needle bar 1.
1 frictionally abuts on the upper end portion 11a of 1. In this state, apply a weight to the hook 15c and rotate the arm 15a of the control balance 15 around the pivot shaft 15d so that the needle bar 11 is at an angle perpendicular to the axis l of the objective lens. The spring force of the winding spring 13 and the weight are balanced.

When testing the measuring power of the non-contact tonometer, the control balance 15 is moved back in one direction so that it does not interfere with the test, and alignment adjustment is performed using the alignment lens 3.
Thereafter, an air pulse is blown onto the lens mirror body 17 to rotate the lens mirror body 17 in the direction of arrow B around the point O of the pivot axis 12, and when the surface of the plane mirror 9 becomes perpendicular to the axis l, light emission occurs. Vessel 7
This is done based on the fact that the amount of parallel light emitted from the plane mirror 9 and reflected by the plane mirror 9 received by the light receiver 8 is maximized.

FIG. 4 shows a second embodiment of a lens mirror body 17 according to the present invention, in which a mirror surface 9a of the lens mirror body 17 is provided at the center, and an alignment lens 3 is provided at the periphery of the lens mirror body 17. This is an example in which a working spherical portion 3' is formed. This lens mirror body 17 can be applied to testing the measuring power of a tonometer in which alignment is performed with reference to the center of curvature of the spherical surface 3', which corresponds to the center of curvature of the cornea of the eye to be examined.

Effects of the invention The feature of the non-contact tonometer measurement force testing device according to the invention is that the alignment lens is integrated with a plane mirror, and the non-contact tonometer is moved in parallel between the alignment lens and the plane mirror. By making it possible to test the measuring force of a non-contact tonometer by emitting a fluid pulse as it is, the operation of measuring force testing becomes easier and the measuring force can be tested more precisely. It has the effect of being able to.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the assembled state of a plane mirror and alignment lens according to the present invention, Fig. 2 is a plan view thereof, and Fig. 3 is a schematic diagram of a measuring force testing device for a non-contact tonometer according to the present invention. FIG. 4 is a sectional view showing the second embodiment of the lens mirror body shown in FIG. 1; FIG. 5 is a perspective view showing the schematic structure of a conventional non-contact tonometer measuring force test device. It is a diagram. 3... Alignment lens, 5... Objective lens holder, 6... Nozzle, 7... Light emitter, 8...
…Receiver, 9…Plane mirror, 10…Twisted balance,
11... Needle bar, 12... Shaft center, 13... Helical spring.

Claims (1)

[Claims for Utility Model Registration] The non-contact tonometer is equipped with an alignment lens corresponding to the eye to be examined and a plane mirror onto which a fluid pulse is sprayed, and after alignment of a non-contact tonometer is performed using the alignment lens, the fluid pulse is A measuring force testing device for a non-contact tonometer that tests the measuring force of the non-contact tonometer by spraying water onto the plane mirror, wherein the alignment lens is configured integrally with the plane mirror. Measuring force testing device for contact tonometer.