JP2007156207A - Manufacturing method for spectacle lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a lens having a novel design which has not been seen before as a lens for spectacles having an edge exposed while a portion or the whole of a rim is absent. <P>SOLUTION: A mark-off line 2 is formed on a surface of a lens precursor in a shape conforming with an external shape of a lens after processing. Then a pad lens 3 having the same external shape as the mark-off line 2 is stuck on the lens surface along the mark-off line 2. Then while the lens to be processed is clamped at the position of the mark-off line 2 with a clamping member from the top and reverse, an outer portion outside the mark-off line 2 is cut along the outer periphery of the pad lens 3 to form an uneven rough surface on a lens outer peripheral edge. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method of manufacturing a lens for use in spectacles of a type in which there is no part or all of the rim and the edge of the lens is exposed.

In recent years, many types of spectacles in which the edge of the lens is exposed without a part or the whole of a rim called a so-called two-point frame or rimless frame have come to be seen. Patent document 1 is given as an example of such two-point frame or rimless frame glasses.
In such glasses, the edge of the lens exposed due to the absence of the rim is not subjected to beveling for rim mounting, and the lens corners are generally chamfered and buffed as necessary. . In addition, these glasses have a design that differs from normal glasses in that there is no part or all of the rim, so a special frame (for example, the frame part is composed only of bridges and temples) is adopted. It is said that it is a high spectacle.
JP-A-6-347725

By the way, since the design design of such spectacles is always the shape of the frame and the color and shape of the lens, it has been desired to create a design that takes advantage of the special feature that the edge of the lens is exposed.
The present invention has been made paying attention to such problems existing in the prior art. An object of the present invention is to provide a method of manufacturing a lens with a novel design that has not been conventionally used in a spectacle lens in which the edge of the lens is exposed without a part or all of the rim.

In order to solve the above-mentioned problem, in the invention of claim 1, a marking line is formed on the surface of the lens precursor in a shape that matches the contour shape of the lens after processing, and an outline that is the same as or approximate to the marking line. A pad body having a shape is adhered to the lens surface along the same marking line, and the marking is performed along the outer periphery of the pad body while holding the lens to be processed from the front and back by a clamping member at the same marking line position. The gist is that an outer portion is removed from the line to form a rough surface on the outer periphery of the lens.
Further, in the invention of claim 2, in addition to the structure of the invention of claim 1, the outer peripheral edge of the pad body is guided when the clamping member removes the outer portion from the marking line along the outer periphery of the pad body. The gist is that it is removed as a surface.
According to a third aspect of the invention, in addition to the configuration of the first or second aspect of the invention, the marking line formed on the surface of the lens to be processed is positioned slightly outward from the outer peripheral edge of the pad body. The gist is to do so.
According to a fourth aspect of the present invention, in addition to the configuration of any one of the first to third aspects, the gist is that the pad body is pressed in the direction of the lens to be processed when notched.
Further, in the invention of claim 5, in addition to the structure of any one of claims 1 to 4, the attaching surface of the pad body attached to the surface of the lens to be processed is the same as or approximate to the curved surface shape of the lens. The gist is that it is formed with a curved line.

In the astigmatism correcting spectacle lens having the above-described configuration, the pad body is attached to the lens surface along a marking line having a shape matching the outer shape of the lens after processing on the surface of the lens precursor. Next, the lens is clamped by the clamping member from the front and back at the same marking line position, and the outer portion is removed from the marking line. In other words, stress concentration occurs at the mark line position due to shear load or compression load when pinched strongly by the pinch member, and bending load when bending with the pinch position as the base, so the lens is generally at the mark line position. It can be broken along the thickness direction of the film and the outer portion can be cut off. The edge portion after the cut-out is not smooth but has a rough surface. The pad body is affixed to the inside from the scribing line and the lens is pressed to reinforce, so there is no damage to the inside direction. The rough surface will be formed at the mark line position.
Next, the pad body is removed from the lens surface processed in this way, and the rough surface is buffed, chamfered, or a hole for attaching a bridge or hinge to the lens is formed as desired. .

Here, it is necessary that the pad body has the same or approximate shape as the marking line. However, it is not necessary that the entire circumference of the pad body has the same or approximate shape as the marking line. For example, when processing only the lower half of the lens by applying the present invention, the configuration may be such that only the lower half of the lens is scratched and the upper half is not marked.
In order to make the marking line visible, the marking line may be positioned slightly outward from the outer peripheral edge of the pad body.
It is preferable from the viewpoint of adhesion that the sticking surface of the pad body is formed with a curve that is the same as or close to the curved shape of the lens. However, if the thickness of the adhesive part interposed between the pad body and the lens surface is sufficient, the gap resulting from the difference in the curve will be absorbed by the thickness of the adhesive part, so it is not necessarily the same. Or it is not necessary to form with an approximate curve.
Further, if the pad body can be firmly fixed to the lens surface, the entire pad body does not necessarily have to be adhered to the lens surface. However, it is preferable that the two are in close contact with each other because the strength (hardness to break) of the lens is further improved, and it is more preferable to press the pad body toward the lens surface.
The scribing line is formed by cutting the lens surface with a very shallow depth of cut using a scribing tool such as a knife, a bite or a drill. The scribing operation includes both a case where a person actually scribbles with a scribing tool such as a knife, a pick, and a scrape, and a case where a machine tool equipped with an NC device is used.
When sandwiching from the front and back at the marking line position by the clamping member, the contact position of the clamping member with the lens surface does not enter the inside of the marking line position. Moreover, it is preferable that the clamping member is composed of a blade body capable of applying a shearing and compressive load, and this blade is in contact with the lens surface in the vicinity of the marking line position.
The removal of the outer portion from the scribe line by the holding member is preferably processed using the outer peripheral edge of the pad body as a guide surface. That is, a part of the clamping member is brought into contact with the outer peripheral edge of the pad body, and the clamping member is moved along the outer peripheral edge, thereby enabling accurate and rapid processing.

  In the invention of each of the above claims, it is possible to form an uneven rough surface that cannot be realized by grinding on the edge portion of a lens for spectacles that has no or all of the rim and the edge of the lens is exposed. Therefore, it is possible to provide a lens with a novel design that has not been used in this type of spectacles.

Hereinafter, a manufacturing method of a plastic lens will be described with reference to the drawings as a specific embodiment of the present invention.
The present embodiment is manufactured by a process as shown in FIG. Hereinafter, each step will be described in order.
<Marking process>
As shown in FIG. 1 (a), first, the surface of a so-called round lens with a negative power (a lens that has already been processed according to the power and has only been processed according to the frame shape) 1 is applied. Insert postcard line 2. The marking line 2 has a shape that matches the outline shape of the lens L after processing. In the present embodiment, the marking line 2 is cut by a cutting tool using a processing machine provided with an NC device such as a machining center based on the outline data of the lens L. Here, the round lens 1 of the present embodiment is a plastic lens in which a base curve is set on the front surface side and a predetermined power is processed on the back surface side.
<Grinding process>
As shown in FIG. 1B, the round lens 1 is made known based on the outer shape data of the lens L so as to leave a slight margin (in this embodiment, 10 mm) outside the marking line 2. Grind with a grinding machine. This facilitates the work in the later-described chipping process using the cutting blade 6. Let the state after grinding be the lens precursor BL. In the lens precursor BL, the outer peripheral edge portion of the marking line 2 is defined as a removal portion 5.

<Paste the pad lens>
As shown in FIGS. 1 (c) and 1 (d), a pad lens 3 as a pad body that matches the outer shape of the lens L after processing is adhered to the surface of the lens precursor BL along the marking line 2. . The pad lens 3 is a transparent meniscus lens, and its back surface is configured with the same curvature as the base curve of the lens precursor BL (round lens 1) in the present embodiment. A double-sided tape 4 is attached to the back surface of the pad lens 3, and the pad lens 3 is adhered and fixed to the lens precursor BL by the adhesive force of the double-sided tape 4. The double-sided tape 4 has a thickness of about 200 μm and also serves as a cushion between the pad lens 3 and the lens precursor BL.

<Removal of lens periphery>
As shown in FIGS. 1E, 2, and 3, the removal portion 5 is cut out by a cutting blade 6 as a clamping member. In the present embodiment, only the cutting blade 6 is illustrated. The operating means of the cutting blade 6 may be a manual tool using a lever mechanism such as a nipper or pliers, or a processing machine using the cutting blade 6 as an actuator.
As shown in FIG. 3, the front edge of the cutting blade 6 abuts against the outer peripheral edge of the pad lens 3, and the outer peripheral edge serves as a guide surface and is cut out in the direction of the arrow. The pad lens 3 is pressed against the lens precursor BL with a predetermined load.
At this time, as shown in FIG. 2 (a), the blade bodies 6a and 6b of the cutting blade 6 hold the lens precursor BL from the front and back at the position of the marking line 2 so that both the blade bodies 6a and 6b approach each other. By strongly compressing the lens precursor BL, a shear and compression load is applied at the position of the marking line 2. Then, as shown in FIG. 2B, the removal portion 5 is cut out due to stress concentration at the position of the marking line 2. In addition, since the inner side of the marking line 2 is reinforced by the pad lens 3 and the marking line 2 is present, cracks caused by chipping do not enter the inner direction from the marking line 2. As a result, an uneven rough surface 7 is formed on the peripheral edge of the lens precursor BL.

<Removing and buffing the pad lens>
After removing the removal portion 5 for the entire circumference of the marking line 2, the pad lens 3 and the double-sided tape 4 are removed, and the chamfered portion 8 is ground to the corner portion between the peripheral edge portion and the front and back surfaces as shown in FIG. Then, the rough surface 7 is buffed to complete a so-called lens-shaped lens L shown in FIG.
The lens L manufactured in such a process is provided with small holes 13 for the pad-integrated bridge 11 and hinge 12 on the front and the outer corners of the eye, respectively. Then, as shown in FIGS. 5 and 6, two lenses L are connected by a bridge 11, a hinge 12 is attached, and a temple 14 is attached to complete a so-called two-point frame glasses.

The following effects are produced by the configuration of the embodiment as described above.
(1) Since the exposed peripheral edge of the lens L is not a smooth surface that is finely ground as in the prior art, but is a rough surface 7 having an uneven shape, light is irregularly reflected on the peripheral edge of the lens L, which is not conventional. Design effects can be obtained.
(2) When the concave / convex rough surface 7 is formed on the exposed peripheral edge of the lens L by using the marking line 2 and the pad lens 3, the concave / convex rough shape is formed while accurately tracing the outer shape of the lens. It became possible to realize special processing.
(3) Since the pad lens 3 is pressed against the lens L, the strength of the lens L in the marking line 2 is improved, and the crack caused by the chipping is coupled with the marking line 2 from the marking line 2. Never get in the direction.
(4) Since the pad lens 3 is attached to the lens L by the double-sided tape 4 having a certain thickness, the curvatures of the opposing surfaces of the pad lens 3 and the lens L are slightly different, and a gap is generated between the two. Even if it becomes, the gap which is filled up with the double-sided tape 4 and the malfunction which arises by the difference in curvature, such as rattling, are eliminated.
(5) When the pad lens 3 is stuck to the lens L, it is preferable that the surfaces facing each other be the same or similar curves because a gap is not formed and the surfaces can be firmly adhered.
If the lens L has the same base curve, the base curve side (front side) is always the same curve even if the myopia power is different. Regarding the close contact of the pad lens 3 with the lens L, in the above embodiment, since the pad lens 3 is attached to the base curve side of the lens L, the type of the pad lens 3 is only the type of the curve of the base curve. If it prepares, it will be sufficient and it will become unnecessary to prepare many pad lenses 3. FIG.

It should be noted that the present invention can be modified and embodied as follows.
In the above embodiment, the scribing line is to be cut with a cutting tool using a processing machine, but before the scribing process, the pad lens 3 is pasted on the surface of the lens precursor BL, and the pad The marking line may be marked with a tool such as a knife, pick or scraper following the outer shape of the lens 3.
-Although the pad lens 3 was used as a pad body, it is also free to comprise a pad body with materials other than a lens.
In the above embodiment, the bonding surfaces of the pad lens 3 and the lens L have the same curve, but they need not necessarily have the same curve.
In the above-described embodiment, the manufacturing method for the plastic lens has been described as an example. However, the rough surface 7 may not be formed on the entire circumference of the lens L but may be a part thereof.
・ It is free to apply to glass lenses.
The present invention is not limited to the optical characteristics of the lens, and can be freely applied to plus power lenses and progressive power lenses.
-Besides, it is free to implement in a mode that does not depart from the gist of the present invention.

(A)-(f) is explanatory drawing explaining the manufacturing process of embodiment of this invention. (A) is explanatory drawing of the state which clamped the lens precursor from the front and back with the cutting blade in the same embodiment, (b) is explanatory drawing of the moment which similarly removed the removal part. Explanatory drawing of the state which is missing with the cutting blade in the same embodiment. The partial expanded sectional view of a lens. The block diagram explaining the process of embodiment of this invention. The exploded front view of the spectacles using the lens manufactured by this Embodiment. The partial omission plan view of the same glasses. A perspective view of the same glasses.

Explanation of symbols

  2 ... marking line, 3 ... pad lens as pad body, 7 ... rough surface, L ... processed lens, BL ... lens precursor.

Claims (5)

A marking line is formed on the surface of the lens precursor in a shape that matches the outer shape of the processed lens, and a pad body having an outer shape that is the same as or approximated to the same marking line is formed along the same marking line. The outer periphery of the lens is adhered to the surface and the outer periphery of the lens is removed along the outer periphery of the pad body while holding the lens to be processed by the holding member from the front and back at the same marking line position. A method for producing a spectacle lens, characterized in that a rough surface is formed on the surface. 2. The outer peripheral edge of the pad body is removed as a guide surface when the outer circumferential portion of the pad body is cut off along the outer periphery of the pad body by the clamping member. A method of manufacturing a spectacle lens. 3. The spectacle lens manufacturing method according to claim 1, wherein the marking line formed on the surface of the lens to be processed is positioned slightly outward from the outer peripheral edge of the pad body. 4. Method. The method of manufacturing a spectacle lens according to claim 1, wherein the pad body is pressed in the direction of the lens to be processed when the pad body is cut out. The sticking surface of the said pad body stuck on the surface of the said to-be-processed lens is formed in the curve which is the same as or approximated to the curved surface shape of the said lens, The one in any one of Claims 1-4 characterized by the above-mentioned. Manufacturing method for eyeglass lenses.

Images