JPH0847479A - Optometric apparatus - Google Patents

Abstract

PURPOSE:To facilitate checking by attaching a mark for checking an axis to a holding member of an optical element and a graduation for checking an axial angle in the perimeter of an inspection window. CONSTITUTION:A mark 55 is attached to the inspection side of lens holders 34 and 35 to match the axial direction of astigmatism lenses 36 and 38 mounted. The mark 55 is arranged in the diameter of an aperture within an inspection window 22 so that an inspector can view through the mark 55 of the lens holder 34 through the inspection window 22. Moreover, even when an 32, aperture on a weak astigmatism lens disc 32 is arranged on the inspection window 22, the mark 55 of the lens holder 35 arranged on the rear thereof can be viewed through. The inspector arranges the astigmatism lenses combined as desired on the inspection window 22 while an axial angle thereof is set by the operation of turning an astigmatism axis conversion knob 27. Here, the inspector can learn the axial angle of the astigmatism lenses by a positional relationship between a scale plate for checking the astigmatism axis mounted about the inspection window 22 and the mark 55 on the lens holders 34 and 35 arranged on the inspection window 22 observing a person to be inspected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optometry apparatus for subjectively measuring the refractive power and the like of an eye to be examined, and more particularly to a mechanism for presenting an axial angle of an astigmatic lens.

[0002]

2. Description of the Related Art A rotary disc having a large number of optical elements such as lenses is arranged, and an optical element having a desired characteristic is switched to an inspection window in front of the eye to be rotated by the rotation of the rotary disk to arrange the refractive power of the eye. 2. Description of the Related Art An optometry device for subjectively inspecting the above is known. This type of optometry apparatus is generally called a horopter, and there are a manual type and an electric type that switches optical elements by driving a motor. By the way, among the optical elements arranged in the above-mentioned optometry device, there are optical elements having an axis such as a cylindrical lens and a cross cylinder lens, and the inspection is performed by setting the axial angle of the optical element to a desired position. Be seen.

The conventional mechanism for presenting the astigmatic axis angle of a manual type horopter is as follows. FIG. 1 is an external view of the apparatus viewed from the examiner side. Reference numeral 1 is an inspection window, 2 is an astigmatism axis scale with a scale of 15 degrees, 3 is an indicator rotation member with an astigmatism axis indicator 4, 5 is an astigmatism axis conversion knob, and 6 is a scale of 5 degrees. Astigmatism axis scale, 7 is the astigmatism axis conversion knob 5
Is an astigmatic axis indicator attached to. The examiner rotates the astigmatism axis conversion knob 5 to rotate the astigmatism lens arranged in the inspection window 1 to change its axial angle, and when the astigmatism axis conversion knob 5 is rotated, the indicator rotation member 3 also rotates.

The rotation mechanism of the astigmatic lens and the indicator rotating member 3 by the astigmatic axis conversion knob 5 is shown in FIG.
The astigmatism lens 8 arranged in the inspection window 1 is fixedly attached to the holder 9. A gear portion is formed on the outer periphery of the holder 9 and meshes with the gear 10. Further, the gear 10 meshes with the gear 11, the gear 11 meshes with the gear 12, and the gear 12 meshes with the gear 13 of the astigmatic axis conversion knob 5. Further, the gear portion of the indicator rotating member 3 which has the same rotation center as the holder 9 meshes with the gear 10. The holder 9 and the gear portion of the indicator rotating member 3 and the gear 13 are designed and arranged so that the gear ratio is 1: 1 and the rotation angles are equal.

In this way, the astigmatic axis indicator 4
The axial angle of the astigmatic lens arranged in the inspection window 1 is presented to the examiner by the astigmatic axis scale 2 and the examiner confirms the rough axial angle of the astigmatic lens without paying attention to the astigmatic axis scale 6. Astigmatism measurements can be made.

In the case of an electric type device, the astigmatic axis angle is electrically displayed by an LED or the like on the operation panel or the like based on a signal from the operation section.

[0007]

However, the shaft angle presenting mechanism in the case of the manual type as described above has a drawback that the structure is complicated, the number of parts is large, and the assembly work takes time. Further, since there are many gear meshing parts, backlash (stacking of gear play) is likely to cause a deviation between the rotation angle of the knob and the rotation angle of the indicator around the optometry window.

In the case of the latter electric type, the examiner can only know the axial angle by looking at the axial angle display on the operation panel or the like. For example, the retinoscope can be used to detect the objective eye through the inspection window. In the case of refraction measurement, there is a problem that the axial angle cannot be seen at the same time while measuring.

In view of the above-mentioned drawbacks of the conventional apparatus, the present invention provides an optometry apparatus which has a simple structure and can easily and surely confirm the axial angle of an optical element arranged in an optometry window. Is a technical issue.

[0010]

In order to solve the above problems, the present invention is characterized by having the following configuration.

(1) Optical elements having various characteristics are arranged on a rotary disk, and by rotating the rotary disk, the optical element is switched to an inspection window and arranged to notice the refractive power of the eye to be examined. In an optometry apparatus for inspecting, an optical element having an optical axis and arranged on the rotating disc, a holding member for rotatably holding the optical element with respect to the rotating disc, and an examiner in an inspection window. A mark for axial confirmation provided to the holding member or the optical element corresponding to the axial direction of the optical element so as to be visible, and a scale for confirming the axial angle provided around the inspection window. , Are provided.

(2) The optical element of (1) is characterized by being an astigmatic lens or a cross cylinder lens.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a manual type horopter will be described below with reference to the drawings. FIG. 3 is a front external view of the apparatus of the embodiment as seen from the examiner side. Reference numeral 20 denotes an optometry apparatus main body, and the optometry apparatus main body 20 includes a pair of left and right symmetrical left and right eye measurement units 21L and 21R. Reference numeral 22 is an inspection window provided in both units 21L and 21R, and a scale plate 23 for astigmatic axis confirmation having scales provided at intervals of 15 degrees is attached around the inspection window 22.

In addition to the spherical lens, a plurality of lens disks, in which auxiliary lenses, astigmatism lenses and the like are arranged, are arranged inside the measuring unit 21. By rotating the spherical lens dial 24, the auxiliary lens knob 25, and the astigmatism conversion knob 26 arranged on the entire surface of the measurement unit, lenses having desired optical characteristics are arranged in the inspection window 22.
The axis angle of the astigmatic lens can be changed by turning the astigmatic axis conversion knob 27. 28 is an astigmatic axis scale in 5 degree increments.

FIG. 4 is a sectional view of an essential part for explaining the internal structure of the right eye measuring unit 21, and FIG. 5 shows a part of the view on arrow A in FIG. Reference numeral 30 denotes an eye to be inspected, and 31 denotes a measurement axis passing through the inspection window 22. Reference numeral 32 is a low-power astigmatic lens disk, and 33 is a high-power astigmatic lens disk. On the same circumference of the weak astigmatism lens disk 32, four types (-0.25
A weak astigmatism lens 36 of -0.25 D step of -1.00 D) is rotatably held, and an opening 37 is also provided. Similarly, on the same circumference of the intensity astigmatic lens disk 33, four types (-1.
The intensity astigmatism lens 38 and the aperture (not shown) of 25 to -5.00D, -1.25D step) are provided. The low-power astigmatism lens disc 32 and the high-strength astigmatism lens disc 33 have a petal shape having grooves 32a and 33a formed between the respective astigmatism lenses and openings,
It is rotatable about the shaft 39. The rotation of the astigmatic lens disks 32, 33 is performed as follows.

Reference numeral 40 denotes a gear coaxially attached to the astigmatism conversion knob 26. A gear 41 meshes with the gear 40,
A rotation drive plate 42 is attached to the gear 41. On the same circumference of the rotary drive plate 42, there are four short pins 43a that engage with the grooves 32a of the weakness astigmatism lens disk 32, and one that engages with both the grooves 32a and 33a of the astigmatism lens disks 32 and 33. The long pin 43b is fixed. When the astigmatism conversion knob 26 is rotated by these configurations, the rotation is transmitted to the rotary drive plate 42, and the short pin 43a and the long pin 4 are transmitted.
3b sequentially engages with the groove 32a of the low-power astigmatic lens disk 32 to rotate the lens disk. Further, when the long pin 43b makes one rotation, the intensity astigmatism lens disc 33
Rotates only one step.

By rotating the astigmatism conversion knob 26 in this manner, the weak astigmatism lens 36 and the intensity astigmatism lens 38 are arranged in the inspection window 22, and various astigmatism powers are produced by the combination thereof.

The astigmatic lens rotates about the measuring axis 31 to change its axial angle. The lens holders 34 and 35 for changing the axial angle are the sun gear 5 that meshes with both gear parts formed on the outer circumferences of the respective lens holders.
0, a gear 51 coaxially attached to the sun gear 50, a first transmission gear 52 meshing with the gear 51, a first transmission gear 52
The astigmatism axis conversion knob 27 is rotated by rotating the astigmatic axis conversion knob 27 via the second transmission gear 53 meshing with the second transmission gear 53 and the knob gear 54 meshing with the second transmission gear 53.

Markers 55 are provided on the examiner side of the lens holders 34 and 35 so as to coincide with the axial directions of the astigmatism lenses 36 and 38 attached. The mark 55 is formed by unevenness, coloring, etc.
It can be easily carried out by mounting the same as that of No. 5 in the axial direction. By placing the mark inside the inspection window 22 and within the diameter of the opening 37, the examiner can see through the mark 55 of the lens holder 34 from the inspection window 22, and the opening 37 on the low-magnification astigmatism lens disk 32 can be seen. The lens holder 35 arranged on the back side of the inspection window 22 even when it is arranged on the inspection window 22.
The mark 55 can be seen through (see FIG. 6).

With the above-described structure, the examiner arranges a desired combination of astigmatism lenses in the inspection window 22 and sets the axial angle by rotating the astigmatism axis conversion knob 27. At this time, the examiner knows the axial angle of the astigmatic lens from the positional relationship between the scale 23 on the measurement unit 21 and the mark 55 on the lens holder 34 or 35 arranged in the inspection window 22 while observing the subject. be able to.

In the above embodiment, the mark 55 for confirming the axial angle is provided on the lens holders 34 and 35, but it may be directly attached to the astigmatic lens itself. Further, in the embodiments, only the confirmation of the axial angle of the astigmatism lens has been described, but the present invention is not limited to the astigmatism lens, and it is necessary to rotate around the measurement axis such as a cross cylinder, a polarizing lens, or a prism. It can be used when an optical element having an axis is arranged in the measuring unit.

Further, although the manual type horopter has been described as an example in the embodiment, it is needless to say that the invention can be applied to an electric type device for switching an optical element such as a lens by driving a motor.

[0023]

As described above, according to the present invention,
Although the structure is simple, the axis angle of the optical element having the axis can be easily and surely confirmed.

[Brief description of drawings]

FIG. 1 is an external view of a conventional manual type horopter viewed from an examiner side.

FIG. 2 is a diagram illustrating an astigmatic axis presentation mechanism of a conventional device.

FIG. 3 is a front external view of the device according to the embodiment.

FIG. 4 is a cross-sectional view of main parts for explaining the internal structure of the right eye measurement unit 21.

5 is a diagram showing a part of a view on arrow A in FIG.

FIG. 6 is a diagram showing that the mark 55 of the lens holder 35 arranged on the back side of the opening 37 on the weak astigmatism lens disk 32 can be seen through even when the opening 37 is arranged on the inspection window 22.

[Explanation of symbols]

 22 Inspection window 23 Scale plate 23 32, 33 Astigmatism lens disk 34, 35 Lens holder 36 Weakness astigmatism lens 38 Intensity astigmatism lens 55 Mark

Claims (2)

[Claims] 1. An optical element having various characteristics is arranged on a rotating disk, and by rotating the rotating disk, the optical element is switched to an inspection window and arranged so as to subjectively inspect the refractive power and the like of an eye to be inspected. In the optometry device, an optical element having an optical axis and arranged on the rotating disc, a holding member that rotatably holds the optical element with respect to the rotating disc, and an examiner visually recognizes the inside of the examination window. A mark for axis confirmation provided to the holding member or the optical element corresponding to the axial direction of the optical element as possible, and a scale for axis angle confirmation provided around the inspection window, An optometry apparatus comprising: 2. The optometry apparatus according to claim 1, wherein the optical element is an astigmatism lens or a cross cylinder lens.