JPS6039378B2 - Adjustment device for eyeglass lens attachment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an adjustment device for correctly attaching a spectacle lens to a spectacle frame so that the center of the pupil of the wearer and the optical axis of the spectacle lens coincide when the wearer wears the spectacles. The present invention relates to a device for measuring the positional relationship between the eyeglass frame and the pupil center of an eyeglass wearer when wearing the eyeglasses in a bag.

Generally, in order to attach spectacle lenses to spectacle frames, it is necessary to measure the positional relationship between the pupil center of the spectacle wearer and the geometric center of the spectacle frame. The periphery of the eyeglass lens must be processed to match the center of the pupil, and the eyeglass lens must be attached to the eyeglass frame.
By performing all of these operations with high precision, it becomes possible to correctly attach the spectacle lenses. However, in this type of equipment, although the processing accuracy of the lens circumferential processing machine called a damasuri machine has improved, the accuracy of measurement up to the point of processing the lens is by no means sufficient as shown below. Ta. FIG. 1a shows a schematic cross-sectional view of a conventional device for measuring the position of the pupil center of an eyeglass bag wearer and the geometric center of the eyeglass frame.

Eye 1 (hereinafter referred to as the subject's eye) of a person using a spectacle frame 2 without a spectacle lens is fixed at a fixed index 3 placed at the focal point of a spherical mirror 4 and is in a state of infinite hyperopia. The objective lens 5 forms an image of the eye 1 and the eyeglass frame 2 onto the focusing plate 6. A grid scale is engraved on the focus plate 6, and the examiner's eye 8 looks at the image on the focus plate 6 through the eyepiece 7 and uses the scale to measure the positional relationship between the center of the pupil and the geometric center of the spectacle frame. . In such a device, the examiner first aligns the pupil center of one eye with the center of the reticle 6 to measure the other eye, and then aligns the center of the pupil of one eye with the center of the reticle 6 to measure the other eye. The entire device must be moved parallel to the position where the center of the pupil of the eye and the center of the focusing plate 6 coincide, and since both eyes are measured completely separately, the state of infinity hyperopia in both eyes is always maintained stably. There is no guarantee that there will be.
Therefore, sufficient accuracy cannot be expected when measuring the positional relationship between the pupil center and the geometric center of the eyeglass frame, or when measuring the interpupillary distance, that is, the interpupillary distance between both eyes. Such defects can be eliminated by observing both eyes simultaneously within the same field of view, but when attempting to observe both eyes simultaneously with such a device, the subject's eye, which is in a state of infinite hyperopia, as shown in Figure 1b, 1's line of sight 1 and the chief ray m of the observation light do not match, but intersect at a certain angle. Therefore, the point where the principal ray m intersects with the eyeglass frame 2 is shifted inward by a distance d from the point where the line of sight 1 intersects with the eyeglass frame 2, and the center of the pupil of the subject's eye 1 and the eyeglass frame 2
It is not possible to accurately measure the positional relationship with the geometric center of the eye or the interpupillary distance. An object of the present invention is to overcome the above-mentioned drawbacks, and to provide an adjustment for wearing spectacle lenses by measurement in a state where both eyes can be observed within the same field of view and the line of sight of the eye to be examined and the principal ray of the observation light coincide. The goal is to provide equipment.

As shown in FIG. 2, the apparatus according to the present invention attempts to observe the eye 1 of a subject wearing a spectacle frame 2 via a first half mirror 11 with a collimator lens 12 having a large diameter and a wide interpupillary distance. It is something to do.

A scale plate 16 is placed at the same distance from the first half mirror 11 as the eye 1 to be examined. can be observed within the same field of view. An eyepiece member 15 having an observation aperture is arranged slightly in front of the rear focal point of the collimator lens 12, and is configured so that the cornea of the examiner's eye 8 is located near the rear focal point of the collimator lens 12. ing. A second half mirror 14 is provided between the collimator lens 12 and the twill member 15, and is set at a distance equal to the distance to the cornea of the optometrist 8, that is, corresponding to the rear focal point of the collimator lens 12. A fixation target 13 is placed at the position. With such a configuration, when the eye 1 to be examined fixates the fixation target 13, the eye 1 to be examined is in a state of infinite far vision due to the action of the collimator lens 12,
The east chief ray observed by the optometrist 8 and the line of sight of the eye 1 to be examined coincide. Therefore, the optometrist 8 can accurately measure the positional relationship between the center of the pupil of the eye 1 and the spectacle frame 2 using the scale calibrated on the scale plate 16. In such an apparatus of the present invention, as shown in FIG. 3, by removing the collimator lens 12 from the observation optical path, the center of the pupil and the eyeglass frame can be adjusted in a state where the subject's eye 1 is looking at a short-distance object, that is, in near vision. The positional relationship with 2 can be accurately measured.

As can be seen from FIG. 3, the fixation target 13 and the optometrist 8 are located at an optically equivalent position with respect to the eye 1 to be examined, and fixation of the eye 1 to the eye 13 means fixation to the eye 8. I decided to do it,
As in the case of infinite hyperopia shown in FIG. 2, accurate measurement is possible because the collimation line of the eye 1 to be examined coincides with the principal ray of the measurement light. In the present invention, as shown in FIG.
A half mirror 17 is provided, and this third half mirror 17
By arranging the two spectacle lenses 18 and 18' to be worn by the spectacle wearer at an equal distance from the scale plate 16, a more accurate and convenient device for correctly attaching the spectacle lenses to the spectacle frame is provided. can do.

In this case, the optometrist 8 has the eye to be examined 1, the eyeglass frame 2,
In addition to the three scale plates 16, glasses lenses 18, 18
′ can be observed simultaneously and overlappingly. The two spectacle lenses 18 and 18' are marked with their respective optical centers, and the scale plate 16 is marked with the shape of the lens attachment portion of the spectacle frame 2 and the geometric center of that shape. Ba,
The examiner aligns the optical center of the eyeglass lens 18, 18' with the center of each pupil of the eye 1 to be examined, and also matches the shape of the eyeglass frame 2 and the lens attachment part on the scale plate 16 to determine the geometry of this shape. The positional relationship between the optical center and the spectacle lenses 18, 18' can be immediately known.

Here, the examiner uses an adsorption member or the like to set the rotation axis for the eyeglass lens peripheral green processing machine at a point on the eyeglass lenses 18, 18' that corresponds to the geometric center point of the above-mentioned type. It becomes possible to quickly and accurately attach the lens to the eyeglass frame. In this embodiment, the third half mirror 17 is connected to the first half mirror 11 and the scale member 16.
However, it is also possible to arrange the third half mirror 17 between the collimator lens 12 and the subject's eye 1, and the optical distance from the collimator lens 12 to the eyeglass lenses 18, 18' is also possible. It is sufficient to make the distance up to and up to the scale member 16 equal. In the device according to the present invention, since direct observation is performed with the examiner's naked eye, the depth of field is relatively deep due to the accommodation power of the naked eye, and regardless of the distance between the eye to be examined and the eyeglass frame (the distance when wearing the eyeglasses) Both can be clearly observed.

This also overcomes the drawback of the conventional apparatus shown in FIGS. 1a and 1b that the depth of field created by the objective lens 5 and the eye 7 to be examined is shallow, resulting in blurring of at least one of the eye to be examined and the eyeglass frame. It is something. Further, according to the present invention, by simply removing the collimator lens 12 from the observation optical path, observation of the subject's eye in a near vision state can be easily and accurately performed. As described above, the present invention provides an apparatus that can measure the positional relationship between the center of the pupil of the eye to be examined and the eyeglass frame with higher accuracy than ever before.

Furthermore, according to the present invention, since the optical axis is determined by a single collimator lens, the adjustment is easier than matching the optical axes of an objective lens and a saddle eye lens, such as a secondary lens. It is easy to use, has little error, and has a simple configuration that allows measurement in bifocal vision.Additionally, by adding a few components, a more convenient adjustment device for wearing eyeglass lenses can be provided. be. In the present invention, the eyelid member 15 having an observation aperture is desirable in order to perform measurements from a correct position on the optical axis of the collimator lens 12 by regulating the field of view for optometry. The collimator lens 12 must be a large lens whose diameter is slightly longer than the interpupillary distance in order to observe both eyes at the same time in infinite farsightedness. It is desirable to have a rectangular shape with minimum weight, and it is also desirable to configure it as a plurality of lenses or a combination of lenses for better observation.

[Brief explanation of the drawing]

1A and 1B are cross-sectional views schematically showing the configuration of a conventional device, and FIGS. 2, 3, and 4 are cross-sectional views schematically showing embodiments of the present invention. 3, 13... Fixation target, 11, 14, 17...
・Half mirror, 12...Collimator lens, 15・
・・・・・・Tawaragan member, 16・・・・・・Scale board. Futo "Zujiu 2 figure O 3 figure 4 figure

Claims (1)

[Scope of Claims] 1. In a device for an examiner to observe the eyes of a subject wearing a spectacle frame and the spectacle frame, the distance between the eyes of the subject for observing both eyes of the subject in the same field of view. A collimator lens having a somewhat large diameter and a half mirror are provided on the subject side of the collimator lens, and a scale member is placed at a distance approximately equal to the distance from the half mirror to the point where the subject's eyes are located. , a fixation target is arranged at the examiner side focal position of the collimator lens, and means for observing the eye to be examined, the eyeglass frame, and the scale member from near the examiner side focal position of the collimator lens. 1. An adjustment device for wearing glasses lenses, characterized by comprising: 2. The apparatus according to claim 1, wherein the collimator lens is movable out of the observation optical path in order to observe the subject's eye in a near vision state. Device. 3. The apparatus according to claim 1 or 2, wherein the means for observing includes an aperture for regulating an observation field of view.