JPH06205740A - Inter-pupil range finder - Google Patents

Abstract

PURPOSE:To provide an inter-pupil range finder having a simple structure and high measurement precision at a low cost. CONSTITUTION:This inter-pupil range finder is provided with the first and second plates 1, 2 slender and slidable in the longitudinal direction, and measuring windows 3, 3 having measuring center lines 4, 4 respectively are formed on the first and second plates 1, 2. A scale 6 is formed in the longitudinal direction on one of the first and second plates 1, 2, a pointer 8 is provided on the other, and the inter-pupil distance is indicated according to the position of the pointer 8 on the scale 6.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an interpupillary distance meter.

[0002]

2. Description of the Related Art The simplest method for measuring the interpupillary distance is to place a ruler in front of both eyes of a human and read the scale. There is also an interpupillary distance meter (Japanese Utility Model Laid-Open No. 3-122802) in which a measuring window corresponding to both eyes is provided on the ruler.

Further, the measurer optically observes both eyes of the subject, superimposes movable luminescent lines on the images of the pupils of both eyes of the subject, and digitally displays the distance between the two luminescent lines at that time. There is also an interpupillary distance measuring device.

[0004]

The former interpupillary distance meter of the prior art has a simple structure, but has a drawback of low measurement accuracy. Further, although the latter latter interpupillary distance meter of the related art has high measurement accuracy, it has a drawback that the structure is complicated and expensive.

In view of the above point, the present invention intends to propose an interpupillary distance meter which has a simple structure and is inexpensive, and has high measurement accuracy.

[0006]

SUMMARY OF THE INVENTION An interpupillary distance meter according to the present invention comprises elongated first and second slidable elements which are longitudinally slidable relative to each other.
Measurement windows 3 and 3 having the measurement plates 1 and 2 and the measurement center lines 4 and 4 on the first and second plates 1 and 2, respectively.
Is formed, a scale 6 is formed in one of the first and second plates 1 and 2 in the longitudinal direction, and a pointer 8 is provided on the other.
Is provided and indicates the interpupillary distance according to the position of the pointer 8 on the scale 6.

[0007]

According to the present invention, such an interpupillary distance meter is brought in front of both eyes of the subject, and the subject is made to see the target at infinity or a predetermined short distance in front, The first and second plates 1 so that the measuring person directly or through the measuring person through the mirror so that the measuring center lines 4, 4 of the measuring windows 3, 3 coincide with the pupils of both eyes of the measuring person. Slide 2 and then the pointer 8
The interpupillary distance is measured by reading the scale 6 pointed to by.

[0008]

Embodiments of the present invention will be described in detail below with reference to FIG. This interpupillary distance meter has elongated first and second plates 1 and 2 which are slidable in the longitudinal direction. The first and second plates 1 and 2 are provided with elliptical measurement windows 3 and 3 each having a major axis in the longitudinal direction and provided with measurement center lines (for example, threads) 4 and 4. The measurement center lines 4 and 4 are provided in the minor axis direction of the elliptical measurement windows 3 and 3. A semi-elliptical notch 7 is provided at the left end of the first plate 1 in the drawing, and the second plate 2 is measured when the first and second plates 1 and 2 have a large overlap. The window 3 is not covered with the left end of the first plate 1.

Scales (units are mm) extending in the longitudinal direction on both side edges on the left end side of the first plate 1, respectively,
6 is formed, and the grooves 5 and 5 are formed in parallel with the groove 6. Then, the pointers 8 and 8 are erected on the second plate 2 through the grooves 5 and 5, respectively, and the first and second plates 1 and
The pointers 8 are guided and moved in the grooves 5 and 5 in accordance with the sliding of the guide 2 in the longitudinal direction.

The first and second plates 1 and 2 are housed in a case 9 made of, for example, a transparent resin material and slidable therein. The case 9 has a shape that covers the lower surfaces of the first and second plates 1 and 2 and the side and upper edges of the first and second plates 1 and 2.

The actual size (unit: mm) of each part of the interpupillary distance meter is as shown in FIG.

Next, a method of measuring the interpupillary distance will be described with reference to FIG. FIG. 2A shows a case where the interpupillary distance meter described above is used to measure the interpupillary distance of both eyes EL and ER by oneself. In this case, the person to be measured / measured looks infinity through the first and second measurement windows 3 and 3 in front of the mirror, and the center line 4 of the first and second plates 1 and 2 Four
So as to match the pupils of both eyes, the first and second plates 1, 2
Slide, and measure the interpupillary distance from the position of the pointer 8 on the scale 6 at that time.

FIG. 2B shows a case where the measurer measures the interpupillary distance between the eyes EL and ER of the subject by using the above-described interpupillary distance meter. In this case, the person to be measured sees the target OB on the panel P at a predetermined short distance through the measurement windows 3 and 3 of the first and second plates 1 and 2, and the person to measure the first and second objects. The first and second plates 1 and 2 are slid so that the center lines 4 and 4 of the plates 1 and 2 of the eye 2 coincide with the pupils of both eyes, and the pupils are moved from the position on the scale 6 of the pointer 8 at that time. Measure the distance.

2A and 2B show the interpupillary distance, the interpupillary distance LP when both eyes of the subject are looking at a target at a predetermined short distance in front of the subject is infinity. Shorter than the interpupillary distance meter LP when

Therefore, the interpupillary distance meter LP when looking at infinity can be easily calculated from the interpupillary distance LP when both eyes of the subject are looking at the target at a predetermined short distance in front. As described above, the coefficient for multiplying the interpupillary distance LP when both eyes of the subject are looking at the target at a predetermined short distance in front can be displayed on the first or second plate 1 or 2. . or,
In this case, both eyes of the subject can directly read the interpupillary distance meter LP when looking at infinity from the interpupillary distance LP when looking at the target at a predetermined short distance in front. The scale 6 may be shortened. The reverse of the above is also possible.

The first and second plates 1 and 2 may be reversed.

[0017]

According to the present invention described above, it is possible to obtain an interpupillary distance meter which has a simple structure and is inexpensive, and has high measurement accuracy.

[Brief description of drawings]

1 is a perspective view showing a state in which first and second plates of an embodiment of the present invention are combined, B is a plan view of a first plate of an embodiment, and C is a plan view of a second plate of an embodiment of the present invention. Side view of the state in which the first and second plates are housed in a case

FIG. 2A is a layout diagram showing an example of a measurement state. B is a layout diagram showing another example of a measurement state.

[Explanation of symbols]

 1 1st board 2 2nd board 3 Measurement window 4 Center line 5 Groove 6 Scale 7 Notch 8 Index 9 Case

Claims (4)

[Claims] 1. An elongated first member slidable in the longitudinal direction relative to each other.
And a second plate, each of the first and second plates is formed with a measurement window having a measurement center line, and one of the first and second plates has a long side. An interpupillary distance measuring device characterized in that a scale is formed in a direction and a pointer is provided on the other side, and the interpupillary distance is indicated according to the position of the pointer on the scale. 2. The interpupillary distance meter according to claim 1, wherein the first and second plates are housed in a case. 3. The distance between the pupils measured when the eyes of the subject are looking at a target at a predetermined short distance on one of the first and second plates The interpupillary distance meter according to claim 1 or 2, wherein a correction value for correcting the interpupillary distance is displayed. 4. The scale is corrected so that the interpupillary distance measured when both eyes of a subject are looking at a target at a predetermined short distance is corrected to the interpupillary distance when looking at infinity. The interpupillary distance meter according to claim 1 or 2, wherein the interpupillary distance meter is formed.