JP4993999B2 - Semi-finished lens for progressive-power spectacle lens and progressive-power spectacle lens - Google Patents

Description

  The present invention relates to a progressive-power spectacle lens and a method for manufacturing the same.

  In general, a progressive-power spectacle lens made of plastic is prepared by first molding several types of semi-finished lenses (hereinafter referred to as semi-lenses) using a mold, and when receiving an order, A semi-lens that can be satisfied is selected, and the selected semi-lens is further processed by cutting so as to satisfy the specific prescription of the orderer to obtain a completed lens product.

  Here, the semi-lens is generally an aspheric optical surface in which the object side surface (convex surface side) of the lens imparts progressive refractive power, and the eyeball side surface (concave surface side) is a non-optical surface composed of a simple surface. It is what. An optical surface is a surface that is precisely formed so that the optical function as a spectacle lens can be exhibited as it is, and a non-optical surface as it is cannot exhibit the optical function as a spectacle lens, and is a spectacle lens. In order to fulfill the optical function, the surface needs to be further processed.

  As the progressive power lens manufactured in this way, conventionally, only the object side surface is an aspherical surface that gives progressive power, and the eyeball side surface that is later formed on the optical surface by cutting processing is a simple spherical surface or In general, it was processed into a cylindrical surface. However, recently, the side surface of the eyeball has also been processed into an aspherical surface. In this double-sided aspherical progressive-power spectacle lens, a spectacle lens having a plurality of addition powers, optical features, and the like can be made from the same semi-lens by a concave free-form surface design.

  By the way, in the case of a progressive-power lens, since the progressive surface has the vertical and horizontal directions, it is often necessary to identify the vertical and horizontal directions of the lens in the process after manufacturing the semi-lens. In such a case, conventionally, among the marks attached to the lens, a mark attached at a position indicating directionality is used, or a new mark indicating directionality is provided at any time in the processing step. Was done.

That is, according to ISO8980-2 and JIS T 7315, the progressive power lens for refractive correction (progressive power lens) is a) equidistant from the vertical plane passing through the fitting point or the prism measurement reference point, and Alignment reference mark consisting of two marks 34 mm apart from each other, b) Additive power or its symbol, c) Permanent mark as defined by the manufacturer's or supplier's trade name or trade name, or their abbreviations It is supposed to be added. In addition, as shown in Patent Literature 1 and Patent Literature 2, a lens may be given a commercial name unique to a supplier such as a spectacle store or other lens information that is different from the manufacturer's mark.

JP 2004-219464 A JP 2006-47782 A

In the case of a single-sided aspherical progressive-power lens, the above-mentioned marks are often given at the semi-lens stage, so there are many cases where there are also marks that can be used for specifying the upper, lower, left, and right. However, in the case of a double-sided aspherical progressive addition lens that has recently increased, the number of marks that can be given in advance at the semi-lens stage is limited, so the number of marks that can be used to specify the upper, lower, left, and right is also limited. . This is because, in the case of a double-sided aspherical progressive-power lens, for example, the addition power itself of the progressive surface itself is not determined at the stage of the semi-lens, so that a display mark related to the addition power cannot be given.

  If there is no mark that can be used to specify the top, bottom, left, and right, for example, if necessary, a mark that can specify top, bottom, left, and right is used in the middle of appropriate processing. In some cases, it was necessary to specify the top, bottom, left, and right depending on the work. The present invention has been made in order to solve the above-described problems. By simply making a simple change to a conventionally used mark or the like without using a special mark or performing complicated measurement, the present invention can be It is an object of the present invention to provide a progressive-power eyeglass lens that enables left and right discrimination.

As means for solving the above-mentioned problem, the first means is:
A progressive refractive power action that is divided and distributed into a first refracting surface that is an object-side surface and a second refracting surface that is an eyeball-side surface, and is formulated together with the first and second refracting surfaces A semi-finished lens for a progressive-power spectacle lens used for a double-sided aspherical progressive-power lens that gives a distance power (Df) and an addition power (ADD) based on a value,
One surface is an aspherical optical surface that imparts a progressive refraction action, the other surface is a non-optical surface, and the optical surface is an identification surface that can identify the upper and lower and / or left and right of a progressive-power spectacle lens. Mark is provided,
The identification mark is formed on the optical surface by a mold used for molding a semi-finished lens, and is one on the left and right sides at an equal distance from a vertical plane passing through a fitting point or a prism measurement reference point. For progressive-power eyeglass lenses, wherein one of two alignment reference marks of different shapes arranged one by one is composed of letters, figures or symbols that are asymmetrical in the vertical and / or horizontal directions Semi-finished lens.
The second means is
The identification mark is a semi-finished lens for a progressive-power spectacle lens according to the first means, characterized in that one side is a triangle parallel to the horizontal reference line of the lens.
The third means is
A progressive-power spectacle lens formed by cutting a non-optical surface of a semi-finished lens for a progressive-power spectacle lens according to either the first or second means to form an optical surface.
The fourth means is
A progressive refractive power action that is divided and distributed into a first refracting surface that is an object-side surface and a second refracting surface that is an eyeball-side surface, and is formulated together with the first and second refracting surfaces A semi-finished lens for a progressive-power spectacle lens used for a double-sided aspherical progressive-power lens that gives a distance power (Df) and an addition power (ADD) based on a value,
One surface is an aspherical optical surface that imparts a progressive refraction action, the other surface is a non-optical surface, and the optical surface is an identification surface that can identify the upper and lower and / or left and right of a progressive-power spectacle lens. Mark is provided,
The identification mark is formed on the optical surface by a mold used for molding a semi-finished lens, and is provided on one side in the left-right direction along the horizontal reference line of the lens and has one side. A semi-finished lens for a progressive power eyeglass lens, characterized in that it is formed in a right- and-left asymmetrical right and left triangular shape parallel to the horizontal reference line of the lens.

  According to the first to third means, it is possible to identify the top, bottom, left, and right only by using a simple mark without using a special mark or performing complicated measurement. Further, according to the fourth means, since the process can be simplified, it is possible to obtain a progressive-power spectacle lens with reduced cost.

  FIG. 1 is a diagram showing a progressive-power spectacle lens according to an embodiment of the present invention, showing marks formed on the object side surface, and FIG. 2 is a diagram showing the progressive-power spectacle lens according to the embodiment of the present invention. FIG. 3 is a diagram showing a mark formed on the eyeball side, and FIG. 3 is a diagram showing a progressive-power eyeglass lens according to an embodiment of the present invention, which is formed on the object side and formed on the eyeball side. FIG. 4 is an enlarged view of the mark shown in FIG. 3. Hereinafter, a progressive-power spectacle lens and a semi-finished lens of a progressive-power spectacle lens according to embodiments of the present invention will be described with reference to these drawings.

In these drawings, the progressive-power eyeglass lens 10 is a double-sided aspherical lens in which both surfaces are formed as progressive-power surfaces, and two alignment reference marks 11 and 12 are formed on the object side surface 10a ( (See FIG. 1). As defined in JIS, the alignment reference marks 11 and 12 are formed at positions equidistant from the vertical plane passing through the fitting point or the prism measurement reference point and at a distance of 34 mm from each other.

  The alignment reference mark 11 is a mark arranged on the nose side, and has an equilateral triangle shape. Further, one side of this equilateral triangle is arranged in parallel with the horizontal reference line of the lens and on the lower side of the lens. The alignment reference mark 12 is a mark arranged on the ear side and has a circular shape. The centers of the circular marks 12 and the center of gravity of the equilateral triangle marks 11 are arranged on the same horizontal line.

  Further, lens information marks 13 and 14 in which other information related to the lens is symbolized are formed on the eyeball side surface 10b of the progressive power lens 10 (see FIG. 2). The lens information mark 13 is a mark arranged on the nose side, and includes three symbols 13a. 13b and 13c (see FIG. 4). The lens information mark 14 is a mark arranged on the ear side and includes two symbols 14a and 14b. Specific information is given to each of these symbols.

  Product identification information is assigned to the symbol 13a, progressive zone length identification information is assigned to the symbol 13b, material refractive index identification information is assigned to the symbol 13c, and addition power identification information is assigned to the symbol 14a. Is added, and addition power definition method specifying information is assigned to the symbol 14b. FIG. 4 shows the marks 11 and 12 formed on the object side surface 10a and the marks 13 and 14 formed on the eyeball side surface 10b. Since the alignment reference mark 11 forming an equilateral triangle is asymmetrical in the vertical direction, the vertical direction can be identified by this mark. Further, since the other alignment reference mark 12 is circular, two alignment marks having different shapes are arranged on the left and right, so that the left and right can also be identified. That is, in this example, it is possible to identify the top, bottom, left, and right only by making one of the alignment reference marks an asymmetrical mark.

  The progressive power lens 10 is formed into a double-sided aspherical spectacle lens by using a semi-finished lens in which one surface is already an optical surface but the other surface is still a non-optical surface, and the non-optical surface is cut. It is a thing. Here, the two alignment reference marks 11 and 12 formed on the object side surface 10a are already formed at the stage of the semi-finished lens. That is, the semi-finished lens is manufactured by molding using a molding die that forms the object side surface 10a on the optical surface. The optical surface of the semi-finished lens is formed by forming the markings of the two alignment reference marks 11 and 12 on the optical surface forming die of the molding die by marking treatment, chemical treatment such as acid, laser treatment or the like. Are formed with alignment reference marks 11 and 12. Thereby, in the processes after the semi-finished lens manufacturing process, the alignment reference marks 11 and 12 can be used when the upper, lower, left and right need to be identified.

  FIG. 5 is a diagram showing a progressive-power spectacle lens according to another embodiment of the present invention, showing a mark formed on the object side surface, and FIG. 6 is a progressive-power spectacle according to an embodiment of the present invention. FIG. 7 is a diagram showing a lens when the watermark formed on the mark object side formed on the eyeball side is seen through, and FIG. 7 is an enlarged view of the mark shown in FIG.

As shown in FIG. 5, this progressive-power spectacle lens 10 is a double-sided aspherical lens in which both surfaces are formed as progressive-power surfaces, as in the above-described example. Only the identification mark 15 having a right and left asymmetric right triangle shape is formed at a position slightly away from the position where the alignment reference mark is provided. One side of the triangular shape of the right-angled triangular identification mark 15 is arranged parallel to the horizontal reference line of the lens and on the lower side of the lens.

  On the other hand, two alignment reference marks 11 and 12 and lens information marks 13 and 14 are formed on the eyeball side surface 10b (see FIGS. 6 and 7). The lens information mark 13 is a mark arranged on the nose side, and includes three symbols 13a, 13b, and 13c (see FIG. 4). The lens information mark 14 is a mark arranged on the ear side and includes two symbols 14a and 14b. Each of these symbols is given specific information as in the above example.

  Here, the identification mark 15 formed on the object side surface 10a is already formed at the stage of the semi-finished lens. On the other hand, the two alignment reference marks 11 and 12 and the lens information marks 13 and 14 formed on the eyeball side surface 10b are formed after the eyeball side surface 10b is cut and formed on the optical surface. That is, in this example, the left / right / up / down asymmetric identification mark is provided, so that there is only one mark at the semi-finishing stage, and the upper / lower / left / right identification can be performed in the subsequent processes using the mark. it can. In addition, the lens information mark is formed after cutting the non-optical surface into an optical surface. That is, it is formed after the addition refractive power is determined. Therefore, a simple mold that molds the semi-finished lens may be formed with one simple left / right / up / down asymmetric type of mark, so that the number of molds can be reduced.

  8 to 10 are flowcharts showing the manufacturing process of the progressive-power spectacle lens according to the embodiment of the present invention. The manufacturing process shown in these drawings has the same process except that the mark marking process including the progressive lens unique information is different in order. Therefore, the process of FIG. 8 will be described and the process shown in FIGS. 9 and 10 will be described. Only differences from the process shown in FIG. 8 will be described.

  In FIG. 8, first, a molding die for molding a plastic lens, in which only an alignment reference mark among permanent marks is formed on a molding surface for forming an optical surface (step S1). . A plurality of types of molds are created according to the type of progressive refractive power as required. Next, a semi-finished lens is molded using this mold. At that time, a mark is transferred and formed on the optical surface of the molded lens (step S2). The semi-finished lens thus manufactured is once classified and stocked for each type (step S3).

  Next, an order is received for a lens (step S4). A corresponding semi-finished lens is delivered to manufacture the ordered lens (step S5). The non-optical surface of the semi-finished lens is cut and polished based on the prescription based on the order information to form an optical surface (step S6). Next, the optical surface thus formed is subjected to surface treatment (formation of a hard film, an antireflection film, etc.) (step S7). Next, a mark including progressive lens unique information other than the alignment reference mark is imprinted on the surface-treated lens (step S8). Next, inspection (step S9) and shipment (step S10) are performed.

  In the example shown in FIG. 9, a mark including progressive lens specific information other than the alignment reference mark is imprinted between the semi-finished lens delivery process (step S5) and the non-optical surface cutting process (step S7). The other steps are the same as those shown in FIG. 8 except that the steps are provided (step S6). The example shown in FIG. 10 includes a non-optical surface cutting / polishing step (step S6) and a surface treatment step (step The process is the same as that shown in FIG. 8 except that a step of marking a mark including progressive lens unique information other than the alignment reference mark is provided between (S8) and S8).

  In the above description, a regular triangle is shown as an up-down asymmetric mark, and a right triangle is shown as an up-down left-right asymmetric mark. However, in this case, the upper and lower and / or left-right asymmetric characters (C, D, J) , K), graphics, and symbols (downward arrow, upward arrow, downward T-letter) may be used. In the above-described embodiment, the method of marking on the eyeball side is described. However, the marking may be performed on the object side. The optical surface of the semi-finished lens may be selected from either the eyeball side or the object side.

  The present invention can be suitably used particularly for a progressive-power spectacle lens having a double-sided aspheric surface.

It is a figure which shows the progressive-power eyeglass lens concerning embodiment of this invention, Comprising: It is a figure which shows the mark formed in the object side surface. It is a figure which shows the progressive-power eyeglass lens concerning embodiment of this invention, Comprising: It is a figure which shows the mark formed in the eyeball side. It is a figure which shows the progressive-power eyeglass lens concerning embodiment of this invention, Comprising: It is a figure at the time of seeing through the mark formed in the object side, and the mark formed in the eyeball side. It is the figure which expanded and showed the mark shown by FIG. It is a figure which shows the progressive-power eyeglass lens concerning other embodiment of this invention, Comprising: It is a figure which shows the mark formed in the object side surface. It is a figure which shows the progressive-power eyeglass lens concerning embodiment of this invention, Comprising: It is a figure at the time of seeing through the mark formed in the mark object side formed in the eyeball side. It is the figure which expanded and showed the mark shown by FIG. It is a flowchart which shows the manufacturing process of the progressive-power eyeglass lens concerning the embodiment of this invention. It is a flowchart which shows the manufacturing process of the progressive-power eyeglass lens concerning the embodiment of this invention. It is a flowchart which shows the manufacturing process of the progressive-power eyeglass lens concerning the embodiment of this invention.

Explanation of symbols

10 progressive-power spectacle lens 11, 12 alignment reference mark 13, 14 lens information mark 15 identification mark

Claims (4)

A progressive refractive power action that is divided and distributed into a first refracting surface that is an object-side surface and a second refracting surface that is an eyeball-side surface, and is formulated together with the first and second refracting surfaces A semi-finished lens for a progressive-power spectacle lens used for a double-sided aspherical progressive-power lens that gives a distance power (Df) and an addition power (ADD) based on a value,
One surface is an aspherical optical surface that imparts a progressive refraction action, the other surface is a non-optical surface, and the optical surface is an identification surface that can identify the upper and lower and / or left and right of a progressive-power spectacle lens. Mark is provided,
The identification mark is formed on the optical surface by a mold used for molding a semi-finished lens, and is one on the left and right sides at an equal distance from a vertical plane passing through a fitting point or a prism measurement reference point. For progressive-power eyeglass lenses, wherein one of two alignment reference marks of different shapes arranged one by one is composed of letters, figures or symbols that are asymmetrical in the vertical and / or horizontal directions Semi-finished lens.   The semi-finished lens for a progressive power eyeglass lens according to claim 1, wherein the identification mark is an equilateral triangle having one side parallel to a horizontal reference line of the lens.   A progressive-power spectacle lens formed by cutting a non-optical surface of the semi-finished lens for a progressive-power spectacle lens according to claim 1 or 2 to form an optical surface. A progressive refractive power action that is divided and distributed into a first refracting surface that is an object-side surface and a second refracting surface that is an eyeball-side surface, and is formulated together with the first and second refracting surfaces A semi-finished lens for a progressive-power spectacle lens used for a double-sided aspherical progressive-power lens that gives a distance power (Df) and an addition power (ADD) based on a value,
One surface is an aspherical optical surface that imparts a progressive refraction action, the other surface is a non-optical surface, and the optical surface is an identification surface that can identify the upper and lower and / or left and right of a progressive-power spectacle lens. Mark is provided,
The identification mark is formed on the optical surface by a mold used for molding a semi-finished lens, and is provided on one side in the left-right direction along the horizontal reference line of the lens and has one side. A semi-finished lens for a progressive-power spectacle lens, characterized in that it is formed in a right- and-left asymmetrical triangular shape that is parallel to the horizontal reference line of the lens.

Images