JP2507643Y2 - Single focus aspherical spectacle lens - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a spectacle lens having an identification mark on a lens surface, and in particular, it is configured to provide optical information of an aspherical lens by using the identification mark. The present invention relates to a monofocal aspherical spectacle lens.

[Prior Art] Generally, at the spectacle point, when framing an unprocessed single-focus spectacle lens into a spectacle frame selected by a customer, conventionally, first, the optical center of the lens (here, the optical center is the prism It is a broad concept that includes points without measurement or measurement reference points for obtaining optical information of the lens.
Is detected by a lens meter or points having a predetermined prism value are detected, and the layout operation of the lens is performed using these points as measurement reference points. Further, this layout operation is exactly the same in the frame processing of the single-focus aspherical lens. In such a layout operation, as described above, it is possible to find and lay out the measurement reference point of the lens in order to obtain the optical information of the lens necessary for the framing process.
This is basically an important task.

[Problems to be Solved by the Invention] However, as described above, in the single-focus aspherical spectacle lens, a point without a prism (optical center) or a point with a predetermined prism value is detected, and this point is used as a measurement reference point. However, strictly speaking, the measurement reference point of the aspherical lens is the center of the aspherical surface, and this point does not always coincide with the optical center described above (processing of the concave surface side which is the other lens surface with respect to the aspherical surface side). (Due to processing errors and manufacturing errors that occur at the time of), the position of the eye point on the layout at the time of framing processing, which is the position of the eyeglass wearer's pupil, and this measurement reference point (aspheric center) There was an inconvenience that was not always the same. Moreover, in the aspherical lens,
A special measuring device such as an interferometer is required to obtain the design center of the aspherical surface from the surface shape.

An object of the present invention is to provide a monofocal aspherical spectacle lens which can easily know optical information such as a measurement reference point (aspherical center) of the monofocal aspherical spectacle lens, and thus can perform a layout operation accurately. To provide.

[Means for Solving the Problems] A monofocal aspherical spectacle lens according to the present invention is a monofocal aspherical spectacle lens having at least two identification marks on the lens surface, and the non-focusing of the identification mark and the spectacle lens. It is characterized in that the center of the sphere is arranged at the apex position of the isosceles triangle.

In the above configuration, preferably, the identification mark and the center of the aspherical surface are arranged at the vertex positions of the equilateral triangle.

In the above configuration, preferably, the identification mark is arranged on the lens surface of the rubbed lens in an area on the ear side of the spectacle wearer.

[Operation] An unprocessed lens for a spectacle lens, which has a circular shape when viewed from the front and is shipped from a spectacle lens manufacturer, has an identification mark (generally " It is called a "hidden mark". At least two identification marks are provided, and the at least two identification marks and the center of the aspherical surface are arranged at the vertices of an isosceles triangle. In this way, since the identification mark and the center of the aspherical surface are arranged so as to have a predetermined geometrical relationship, the center of the aspherical surface of the lens is detected using these two identification marks.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a front view of a spectacle lens according to the present invention. The spectacle lens 1 shown in FIG. 1 is an unprocessed lens having a circular contour shape when viewed from the front, and in this embodiment, for example, the refractive power is −1.00 diopter and the outer diameter is 70 mm. In addition, it is assumed that the convex surface is an aspherical single-focus lens.
The spectacle lens 1 is a plastic lens formed of, for example, diethylene glycol bisallyl carbonate as a main material.

In the spectacle lens 1 shown in FIG. 1, 2 is a circular mark portion indicating the position of the power measurement reference portion, 3 and 4 are reference marks indicating the position of the geometric horizontal line of the spectacle lens 1, 5 and 6
Is a hidden mark having a function as an identification mark for displaying the source of the manufacturer. These circular mark parts 2,
The reference marks 3 and 4 and the hidden marks 5 and 6 are displayed on the convex surface of the spectacle lens 1.

The circular mark portion 2 is painted with a broken line so as to have a circular shape with a radius of about 5 mm. The painting of the circular mark portion is performed at the time of manufacturing the lens. The circular mark portion 2 is displayed as an index indicating the existing position of the center of the aspherical surface of the spectacle lens 1, and the circular mark portion 2 includes a measurement reference point for obtaining optical information of the spectacle lens 1. In this embodiment, the circular mark portion 2 is shown as an area having a radius of about 5 mm. Such a circular mark portion 2 indicates a distance eye point position in the case of prescription of distance glasses, and a near eye point in the case of prescription of near glasses during frame processing. It will indicate the position. Therefore, when the power of the spectacle lens 1 is measured with a known lens meter, the circular mark portion 2 of the spectacle lens 1 is applied to the aperture which is the measurement site of the lens meter to set the measurement reference. One piece of optical information, for example the aspherical center, can be defined. That is, in the aspherical lens, a special measuring device such as an interferometer is required to obtain the design center point of the aspherical surface from the surface shape. Furthermore, if the shape is deformed by an external force received from the spectacle frame or the like and does not completely return to its original shape like a plastic lens, it is very difficult to find the design center point of the aspherical surface from the shape of the surface. Difficult and virtually impossible. As described above, in the aspherical lens, it is difficult to specify the center of the aspherical surface without the circular mark portion that defines the center of the aspherical surface.

Further, since the circular mark portion 2 is erased after the spectacle lens 1 is framed, it becomes more difficult to find the center of the aspherical surface by using the circular mark portion 2 thereafter.

The reference marks 3 and 4 exist on the geometric horizontal line 7 as shown in FIG. In reality, the line 7 is not drawn on the surface of the spectacle lens 1. On the contrary, the position of the geometric horizontal line 7 of the spectacle lens 1 can be assumed by the positions of the reference marks 3 and 4. Assuming the geometric horizontal line 7 by the reference marks 3 and 4 as shown in FIG.
The center of the aspherical surface of this spectacle lens is located on the geometric horizontal line. By the way, the reference marks 3 and 4 are marked with a convex shape on the lens surface. This is because the spectacle lens 1 is formed by the casting polymerization method, and thus these marks are previously engraved on the transfer surface of the mold, and as a result, the reference mark is formed in a convex shape by the transfer action during lens molding. . In particular, the reference mark 3 is formed in a triangular shape having an apex facing the center direction of the spectacle lens 1, and has a different shape from other circular reference marks 4. Thereby, the nose side and the ear side of the spectacle lens 1 can be distinguished. In this embodiment, when the spectacle lens 1 is framed, the reference mark 3 is arranged on the ear side of the spectacle wearer and the reference mark 4 is arranged on the nose side of the spectacle wearer.

The hidden marks 5 and 6 are placed at positions symmetrical with respect to the geometric horizontal line 7 by arranging a geometric horizontal line 7 between them, and a line segment connecting each of the hidden marks and the center of the aspherical surface. Are arranged so as to form an angle of 30 degrees with respect to the geometric horizontal line 7. Further, the distances between the hidden marks 5 and 6 and the distances between the hidden marks 5 and 6 and the center of the aspherical surface are all set to be equal to, for example, 17 mm. Therefore, the two hidden marks 5 and 6 and the center of the aspherical surface are arranged at the positions of the vertices of an equilateral triangle in the front view of FIG. Because of this hidden mark 5,6
If the positions of the two points are found, the position of the center of the aspherical surface can be easily found by the above-mentioned geometrical relationship.

The geometrical positional relationship between the hidden marks 5 and 6 and the center of the aspherical surface is an example, and if these hidden marks and the like are arranged at the positions of the vertices of an isosceles triangle, the positions of the two hidden marks and The aspheric centers can be easily found by other geometrical conditions given to them.

FIG. 2 shows a layout in which the spectacle lens 1 is framed in a spectacle frame. In this figure,
Reference numeral 1 is the spectacle lens, and reference numeral 8 shown by a broken line is a spectacle frame in which framing is performed. Since the hidden marks 5 and 6 are identification marks having a source display function, even when the spectacle lens 1 is cut into a shape corresponding to the spectacle frame 8, the hidden marks 5 and 6 are preliminarily positioned so as to exist on the surface of the cut shape. Is preferably performed.

In the configuration of the spectacle lens 1 shown in FIG. 1, the hidden marks 5 and 6 are provided on the ear side with respect to the center of the aspherical surface. This is because in the usual frame prescription, the eye point is often located on the nose side of the geometric center of the lens frame of the spectacle frame, so if the hidden marks 5 and 6 are provided in the ear side region,
When cutting spectacle lenses, hidden marks are not cut together.

As a method of giving the above-mentioned hidden mark, for example, a publicly known method such as a method disclosed in JP-B-59-48361 and JP-A-60-23092, and a method of engraving with a laser can be applied. In this way, it is possible to engrave the hidden mark directly on the lens surface or indirectly using the transfer surface of the casting mold.

Further, in spectacle lenses, prescriptions, spectacle frame information, and lens measurement reference points are indispensable, and accurate fitting is required to make good spectacles. For example, for a lens such as an aspherical single-focus lens that is designed strictly in accordance with the correct wearing condition of eyeglasses, it is important to accurately grasp the measurement reference point of the lens.
Therefore, the spectacle lens according to the present invention can easily and quickly detect accurate optical information of the lens.
It is extremely useful for the above-mentioned single focus aspherical lens.

[Effects of the Invention] As is apparent from the above description, according to the present invention, two identification marks are provided, and the identification marks are arranged at the vertices of an isosceles triangle between the two identification marks and the optical center. Since the predetermined geometrical relationship is given as described above, the center of the aspherical surface can be easily found using the identification mark. Further, according to the present invention, if the two identification marks are both positioned in the region on the lens surface on the ear side of the spectacle wearer, the identification marks will not disappear in the cutting work of the framing process. Have.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a spectacle lens according to the present invention, and FIG. 2 is a front view showing a layout state of a spectacle lens and a spectacle frame. [Explanation of Codes] 1 is a spectacle lens, 2 is a circular mark portion, 3 and 4 are reference marks, 5 and 6 are hidden marks (identification marks), 7 is a supposed horizontal horizontal line, and 8 is a supposed spectacle frame. is there.

Claims (3)

(57) [Scope of utility model registration request] 1. A monofocal aspherical spectacle lens having at least two identification marks on the lens surface, wherein the identification mark and the center of the aspherical surface of the spectacle lens are arranged at vertex positions of an isosceles triangle. Characteristic monofocal aspherical spectacle lens. 2. The single-focus aspherical spectacle lens according to claim 1, wherein the identification mark and the center of the aspherical surface are arranged at the vertex positions of the equilateral triangle. 3. The single-focus aspherical spectacle lens according to claim 1, wherein the identification mark is arranged in a region on the lens surface of the lens whose edge has been rubbed on the ear side of the spectacle wearer.