JPH08297262A - Method and device for aligning spectacle lens - Google Patents

Abstract

PURPOSE: To provide a method and a device for aligning spectacle lens by which the spectacle lens is easily and accurately aligned without being influenced by the strength of the refractive power of the spectacle lens. CONSTITUTION: A projection type position display means 3 having an aligning mark is arranged on the convex side of the spectacle lens 4, and an illumination means is arranged astern of the display means 3. By projecting the projected pictures of a hidden mark formed on the lens 4 and the aligning mark on a projected picture display means 6 arranged on the concave side of the lens 4, alignment is performed by adjusting the position of the lens 4 so that the relative position of both of them may be a specified positional relation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spectacle lens, and more particularly to a lens alignment method for printing a layout symbol on a progressive multifocal lens and an apparatus used therefor.

[0002]

2. Description of the Related Art As is well known, generally, in an eyeglass store, in order to incorporate an eyeglass lens into an eyeglass frame desired by a customer, the outer shape of the eyeglass lens is cut according to the shape of the frame, which is called framing. The work being done is being done. In that case, when the customer wears the spectacles, the predetermined position of the lens (generally the optical center,
This is called a fitting point. ) And the center of the pupil of the eye must be positioned and processed, which is called fitting. Further, in the case of a progressive multifocal spectacle lens, the upper and lower parts of the lens have different asymmetrical correction powers and have asymmetrical vertical refraction surface shapes. It is necessary to pay attention to the direction of the fitting. However, it is practically impossible to distinguish the top, bottom, left, and right of a transparent spectacle lens having a circular planar shape. Therefore, the progressive multifocal lens is provided with a layout symbol indicating the fitting point, the vertical and horizontal directions, etc. at the stage of shipment from the manufacturer.

FIG. 2 shows an example of a layout symbol in a progressive multifocal spectacle lens. In FIG. 2, reference numeral 21 denotes a hidden mark which is previously provided on the convex surface side of the lens when molding the lens. The hidden mark 21 is formed as a minute protrusion on the convex surface side of the lens by molding the lens using a molding die having a minute recess formed at a predetermined position, so that it does not hinder the visibility when worn. Size,
Further, as shown in FIG. 2, it is formed at two horizontal positions apart from the center of the lens. The layout symbol is printed at a predetermined position based on the position of the hidden mark 21. 22 is a horizontal reference line indicating the horizontal direction of the lens, 2
3 is a distance dioptric power measurement position indicating a position for measuring the dioptric power, 24 is a near dioptric power measurement position for measuring the dioptric power,
25 is a fitting point. In addition, in FIG.
It shows an example of a progressive multifocal spectacle lens asymmetrical,
In this case, the right-eye lens and the left-eye lens have opposite left and right shapes, so that the identification mark 26 for distinguishing between the right-eye lens and the left-eye lens is also printed. FIG. 2 shows that the lens is for the left eye.

In an eyeglass store, first, the diopter at the distance dioptric power measuring position 23 and the near diopter dioptric power measuring position 24 is measured to check whether or not the corrective diopter is suitable for the prescription data of the customer, and then the horizontal diopter. The position of the lens and the vertical and horizontal directions are determined using the reference line 21 and the fitting points 25, and framing processing is performed. The various layout symbols are
It is printed with an erasable printing ink that uses an oil-soluble resin such as epoxy resin or ester resin as the vehicle resin, and after the framing process is completed, erase these layout symbols with a solvent such as alcohol or acetone, and Set to. As described above, in order to properly fit the progressive multifocal spectacle lens at the spectacle store, the manufacturer needs to print the layout symbol at an accurate position, and the alignment of the lens at the time of printing is important.

FIG. 3 shows a conventional method of aligning a spectacle lens when printing a layout symbol. As shown in the figure, conventionally, the illumination means 2 illuminates the illuminating light from the concave side of the spectacle lens 4, and the projected image of the hidden mark formed at the hidden mark position 9 on the convex side of the spectacle lens 4 is changed to the spectacle lens. 4 was projected on the projection image display means 6 arranged on the convex surface side. The projection image display means 6 is provided with an alignment mark in advance at a predetermined position, specifically, a position corresponding to the regular position of the hidden mark position 9. The alignment mark and the projected image of the hidden mark are The eyeglass lens 4 is vertically or horizontally moved or rotated so as to be aligned with each other, so that the positions are adjusted to match the regular position. After that, a predetermined layout symbol was printed by a printing means (not shown).

[0006]

However, such a conventional positioning method has the following problems.

That is, the illumination light transmitted through the spectacle lens 4 is refracted by the refracting power of the lens. Moreover, in order to obtain the optimum correction power according to the eyesight of the customer, spectacle lenses having hundreds of different refracting powers are manufactured, so that the refracting power of the lens also changes the refraction amount of the illumination light. . As a result, as shown in FIG. 3, the projection position 10 of the hidden mark changes variously depending on the magnitude of the refractive power of the lens even if the position of the spectacle lens 4 is the same. Therefore, even if the projection position 10 of the hidden mark is accurately aligned with the alignment mark, it does not necessarily mean that the spectacle lens 4 is at the exact position, and there is a problem that the exact alignment cannot be performed.

Of course, the refraction amount of the illumination light according to the refracting power of the lens can be calculated in advance. Therefore, the projection image display means in which the position of the alignment mark is corrected based on the calculation is used as the refracting power of the lens. Although it is possible to prepare and use different types of projection image display means depending on hundreds of types of lenses, it is not practical to prepare and use such projection image display means significantly because the manufacturing cost increases significantly. Had a problem. In addition,
Even if this method is carried out, there is a problem that it is not possible to completely prevent the occurrence of an alignment error because it cannot deal with a change in the projection position due to an error in the refractive power caused by a manufacturing error. Thus, if an error occurs in the alignment of the spectacle lens, an error also occurs in the print position of the layout symbol. As a result, there is a problem that an error occurs in fitting at an eyeglass store and the customer cannot obtain proper corrected vision.

Therefore, an object of the present invention is to provide a spectacle lens alignment method and device which can easily and accurately align the spectacle lens without being affected by the magnitude of the refractive power of the lens. It is a thing.

[0010]

A spectacle lens alignment method of the present invention is a spectacle lens alignment method for aligning the spectacle lens using a hidden mark provided on the convex surface side of the spectacle lens, On the convex side of the spectacle lens, a projection type position display means provided with a positioning mark at a predetermined position is arranged, and illuminating light is radiated toward the spectacle lens from behind the projection type position display means, Projecting the projected image of the hidden mark and the alignment mark on the projected image display means arranged on the concave side of the spectacle lens,
The position of the spectacle lens is determined by adjusting the position of the spectacle lens so that the relative position between the projected image of the hidden mark and the projected image of the alignment mark has a predetermined positional relationship.

Further, the eyeglass lens alignment device of the present invention is the eyeglass lens alignment device for aligning the eyeglass lens by using a hidden mark provided on the convex surface side of the eyeglass lens. Disposed on the side, the projection-type position display means provided with a positioning mark at a predetermined position, is disposed behind the projection-type position display means,
And a projection image display unit that is disposed on the concave side of the spectacle lens and that displays a projection image of the hidden mark and the alignment mark by the illumination light. And

Further, it is characterized by further comprising: photographing means for photographing the projected image of the hidden mark and alignment mark projected on the projected image display means, and image display means for displaying the image photographed by the photographing means. And

The present invention is particularly applied to the alignment of progressive multifocal spectacle lenses, and is suitable for the alignment at the time of printing the layout symbol applied to the progressive multifocal spectacle lenses.

[0014]

According to the present invention, as shown in FIG. 1, the projection type position display means 3 provided with the alignment mark at a predetermined position is arranged above the spectacle lens 4 and the illumination means 2 is arranged above the projection position display means 3. The illuminating light is emitted toward the spectacle lens 4, and the projected images of the hidden mark and the alignment mark are projected on the projected image display means 6 arranged below the spectacle lens 4, and the projected position 10 of the hidden mark is displayed. The position is adjusted by moving or rotating the spectacle lens 4 vertically or horizontally so that the projection position 11 of the alignment mark has a predetermined relative relationship with each other. Also in the present invention, since the illumination light from the illumination means 2 is refracted by the refracting power of the lens, the projection position 10 of the hidden mark changes variously according to the refracting power of the lens. However, in the present invention, the projection image of the alignment mark provided on the projection-type position display means 3 is also projected by the illumination light through the spectacle lens 4 onto the projection image display means, so that the projection position 11 of the projection position display means 3 It changes by the same amount as the projected position 10 of the hidden mark according to the refractive power. That is, since these two projected images are equally affected by the refracting power when passing through the spectacle lens 4, if the positions of the spectacle lens 4 are the same, the projection position of the hidden mark will not be affected by the refracting power. 10 and the projection position 11 of the alignment mark can always maintain the same relative positional relationship and can be accurately aligned based on the relative positional relationship between the two regardless of the refractive power of the lens.

FIG. 1 shows an example in which the predetermined position of the alignment mark is slightly deviated from the hidden mark position 9 to the center side of the lens when the spectacle lens 4 is in the regular position. However, it goes without saying that the hidden mark and the alignment mark may be set at the same position if the projected images of these hidden marks can be easily identified as overlapping. Further, even if the illuminating means 2 and the projection type position display means 3 are arranged below the spectacle lens 4 and the projection image display means 6 is arranged above the contrary to FIG. You can

[0016]

The present invention will be described in detail with reference to the following examples.

[Embodiment 1] FIG. 4 is a view showing an example of an alignment apparatus used for aligning a spectacle lens according to the present invention. As described above, the projection type position display means 3 provided with the alignment mark at a predetermined position is arranged above the spectacle lens 4, and the illumination means 2 is arranged above it. A printing unit 1 for printing the layout symbol is arranged further above the printing unit 1. On the other hand, a projection image display means 6 is arranged below the spectacle lens 4, and an image input means 7 for photographing projected images of the hidden mark and the alignment mark projected on the projection image display means 6 is arranged below the projection image display means 6. ing. Further, 5 is a lens support means provided with means for moving up and down and left and right and horizontally.

First, the spectacle lens 4 is placed at an arbitrary position on the lens support means 5, and illumination light is emitted from the illumination means 2 to project the projection image of the hidden mark and the alignment mark on the projection image display means 6. The projected image is taken by the image input means 7 and displayed on the image display means installed in a place where it is easy to work. While confirming the relative positional relationship between the projection positions 10 and 11 of the hidden mark and the alignment mark from the image displayed on the image display means 8, the worker moves the lens support means 5 vertically and horizontally or rotates it. Adjust the position of the spectacle lens by adjusting the position. When the alignment is completed, the illumination unit 2 and the projection type position display unit are moved to a position where they do not interfere with printing, and the printing unit 1 is lowered to print a predetermined layout symbol on the convex surface of the spectacle lens 4.

The lens support means 5 may be moved vertically and horizontally and rotated manually, but the position can be adjusted more easily by using a drive control means such as a servo motor. Furthermore, in combination with this, the image display means 8
Instead of, the projection position 1 of the hidden mark and the alignment mark
By using the image processing control means for automatically identifying 0 and 11 and controlling the drive control means of the lens support means, it becomes possible to automate the position alignment work of the spectacle lens. Various printing methods such as pad printing, rubber letterpress printing, screen printing, and flexo printing can be applied as a method of printing the layout symbol by the printing unit 1. However, in view of the type of printing ink used and the printing quality, the pad is used. Printing is most preferred.

[Embodiment 2] FIG. 5 is a view showing another example of a positioning device used for positioning a spectacle lens according to the present invention. The difference from the first embodiment is that the printing unit 1 is arranged laterally, and when the lens alignment is completed, the lens support unit 5 is moved horizontally (direction of the arrow in the figure) while maintaining the positional relationship. The point is that a movement control means for moving to a predetermined position directly below the printing means 1 is provided. The printing unit 1 prints a predetermined layout symbol on the spectacle lens thus moved. With such a configuration, the printing device and the alignment device can be separately configured, and a commercially available printing device can be used, so that the device can be manufactured at low cost. .

[0021]

According to the alignment method and apparatus of the present invention, the lens can be aligned easily and accurately without being affected by the magnitude of the refractive power of the spectacle lens, and the layout symbol can be printed. It is possible to provide spectacles that can perform appropriate correction visual acuity without fitting errors during framing processing. Further, the present invention is not only for eyeglass lens position alignment at the time of printing the layout symbol, but also for other lens manufacturing processes.
It can also be applied to positioning work using hidden marks as a reference.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a positioning method of the present invention.

FIG. 2 is a plan view showing an example of a layout symbol of a progressive multifocal spectacle lens.

FIG. 3 is an explanatory diagram showing a conventional alignment method.

FIG. 4 is an explanatory view showing an example of a positioning device according to the present invention.

FIG. 5 is an explanatory view of another example of the alignment device according to the present invention.

[Explanation of symbols]

 2. Lighting means 3. Projection type position display means 4. Eyeglass lens 6. Projection image display means 9. Hidden mark position 10. Projection position of hidden mark 11. Projection position of alignment mark

Claims (5)

[Claims] 1. A method of aligning a spectacle lens by using a hidden mark provided on the convex side of the spectacle lens, wherein a convex alignment mark is provided at a predetermined position on the convex side of the spectacle lens. The projection position display means is provided, and the illumination light is emitted from the rear of the projection position display means toward the spectacle lens, and the projected images of the hidden mark and the alignment mark are displayed on the spectacle lens. Projecting on the projection image display means arranged on the concave side, adjusting the position of the spectacle lens so that the relative position of the projection image of the hidden mark and the projection image of the alignment mark has a predetermined positional relationship, A method for aligning a spectacle lens, characterized in that the position of the spectacle lens is determined. 2. The method for aligning a spectacle lens according to claim 1, wherein the spectacle lens is a progressive multifocal spectacle lens. 3. A spectacle lens alignment device for aligning a spectacle lens using a hidden mark provided on the convex side of the spectacle lens, wherein the spectacle lens is arranged on the convex side of the lens and aligned at a predetermined position. Projection-type position display means provided with a mark, illumination means arranged behind the projection-type position display means, illuminating light in the direction of the eyeglass lens, and arranged on the concave side of the eyeglass lens, depending on the illumination light. A spectacle lens alignment device comprising projection image display means for displaying projection images of the hidden mark and the alignment mark. 4. An image display device for displaying the image captured by the image capturing device and an image display device for capturing a projected image of the hidden mark and the alignment mark projected on the projected image display device. The spectacle lens alignment device according to claim 3. 5. The eyeglass lens alignment device according to claim 3, which is used for aligning a progressive multifocal eyeglass lens.