JP5046333B2 - Lens distortion prevention structure for eyeglasses and method for cutting eyeglass lenses - Google Patents

Description

The present invention has a structure in which the shape of the spectacle lens is formed by extending the lens corner portion closer to the center between the left and right lenses, thereby preventing distortion caused by the lens frame of the spectacles and expanding the lens field of view. and concerning the lens distortion prevention structure of eyeglasses, also relates to a cutting machining method of a spectacle lens for producing a spectacle lens of the shape.

  In general, the shape of a spectacle lens with a degree is such that the right and left eyes are made of a circular lens material corresponding to the eyeglass power that has been subjected to internal grinding necessary to conform to the spectacle power indicated in the prescription. Cutting with a grinding wheel such as chamfering, or chamfering with a dry blade such as an end mill or grinding of the lens peripheral surface, and finishing to a shape (peripheral shape) that matches the lens frame shape data of a predetermined design shape Yes. In this case, it is premised that a lens frame designed in various shapes is used as the outer peripheral shape of the lens to be finished. In general, the lens frame of the predetermined shape has a substantially trapezoidal shape (oval shape whose upper side is slightly longer than the lower side). It is formed as a shape with a design that matches the design of the lens frame, assuming a gentle circular curved eyeglass lens on both the upper and lower sides and both sides. As a standard shape, rounded corners are formed by connecting different circular arc parts having a circle.

  However, as for the lens frame, as a shape, a full rim frame with a shape surrounding the entire periphery of the spectacles with a frame material, there is a frame only on the upper side, and the lower side is called a nyroll of a type that fixes the lens by pulling with nylon thread, Alternatively, there is a so-called rimless frame called a rimless frame in which holes are formed in the left and right lenses and a pair of left and right eyeglass lenses is connected by a connecting member called “two points” with screws or adhesive. As materials, metal frames using metals such as gold, titanium, nickel alloys and cobalt alloys as main parts, plastic frames using synthetic resins such as celluloid, acetate, and epoxy, and combinations of different materials such as metal and plastic. There are combination frames.

  As an example of a spectacle lens processing method or apparatus premised on processing into a spectacle lens shape that fits into the lens frame of such a spectacle, refer to “Glasses Lens Processing Apparatus and Method” of Patent Document 1 as an example. Although shown, the shape of the spectacle lens formed by such a processing method is a curved trapezoidal shape (ball shape) in which the conventional outer peripheral edge is circular as described above. It is assumed that both spectacle lenses are connected and fixed together by a frame. Many methods for processing such spectacle lenses have been proposed in addition to the above. In any case, the shape of the spectacle lens is a ball shape in which curves are similarly connected to a curved trapezoidal shape.

On the other hand, the shape of the spectacle lens has a close relationship with the lens frame in terms of what type of lens frame to use, and in particular for spectacles equipped with a conventional prescription lens, the desired design It is a general spectacle design that the outer shape of the spectacle lens is fitted to the lens frame by cutting and fitting and used. In this case, generally, a full rim frame or nyroll is generally used, but “rimless glasses” of Patent Document 2 is known as an example other than such a general full rim frame. This spectacle has no lens frame, and is configured such that a bridge is connected to the center of a pair of spectacles and a temple tip is connected laterally. In this spectacle, the spectacle lens has a ball shape, and the spectacle lens can be replaced with another type of lens by removing a large number of screws connecting the bridge and the temple.
Japanese Patent Laid-Open No. 11-10501 JP 2005-309345 A

  By the way, in the spectacle lens processed by the processing method of Patent Literature 1, the shape of the spectacle lens has been designed on the assumption that the spectacle lens is adapted to the frame shape of various types and materials. The shape was determined by cutting and grinding into a bead-shaped curve. The spectacle lens thus formed by cutting and grinding is forcibly fitted into the lens frame and used. In particular, when the lens frame adopts a metal high-strength full rim frame or a nyroll type, if the spectacle lens is forcibly inserted into the lens frame, the plastic frame is attached to the lens frame by the tightening force of the lens frame. Since the spectacle lens is forcibly deformed along the line, distortion occurs in the spectacle lens, and the frequency distribution set for the spectacle lens changes. For this reason, there may be a case where a power distribution corresponding to the type of glasses having a prescription power such as hyperopia, myopia, and presbyopia cannot be obtained as the design of the glasses.

  For this reason, such extremely subtle and difficult to quantify changes have been captured in the past, and as one of the methods for avoiding such changes, the rimless (rimless) glasses of Patent Document 2 are known. Is being used. However, even in such rimless glasses, a hole is formed at the end of the spectacle lens to form a bridge portion, and distortion is caused by screwing the screw into the hole, and thus distortion is completely generated. Cannot be avoided. Accordingly, a spectacle lens and a lens that can securely hold the spectacle lens in the lens frame without distorting the spectacle lens along the shape of the lens frame by the tightening force of the lens frame by a screw that is screwed into a hole processed in the spectacle lens. It is desirable to have a structure of a spectacle lens having a frame relationship.

  However, since it has been common knowledge that the design shape of the conventional lens frame is either a full rim frame or a nyroll type, the lens frame should be a lens frame with at least the upper half of the lens frame. This is a type that forcibly fits in the shape of the lens, and when the lens is fitted into the lens frame of the spectacles, the bevel convex part or concave part on the outer periphery of the lens is fitted and fixed so that the lens does not come off the frame. The When the spectacle lens is fitted into the lens frame and tightened, it cannot be avoided that the spectacle lens is distorted due to deformation caused by the force of the lens frame along the lens frame shape. Therefore, in order to prevent distortion of the lens, it is necessary to devise means for fixing the spectacle lens to the lens frame by means other than forcibly fitting the spectacle lens to the lens frame.

  When considering such a fixing means, since the spectacle lens is shaped like a conventional lens, a bridge fitting is provided at the center bridge position, and the spectacle lens is forcibly fitted to the lens frame at least in the upper half portion. In the format, the influence of deformation due to the lens frame cannot be avoided. Therefore, instead of keeping the format, for example, a holding portion is formed at one or both ends of the spectacle lens, and the holding portion is fixed by a fixing means. It is conceivable that the spectacle lens is securely fixed to the lens frame, and the lens frame has a shape that does not act on the spectacle lens. In this case, the shape of the inner side of the lens, including the corner portion where the upper side and the side near the center of the left and right spectacle lenses of the target lens shape affect the function of the spectacle lens, particularly the field of view. How to determine the shape is an important element in designing the lens. A holding part is formed in this corner part, the width of the inner side of the lens including the corner part is widened, and a spectacle lens with a wider field of view can be obtained. The important question is whether it can be done.

  However, on the premise of the conventional lens shape, in the spectacle lens with a prescription power, the outer peripheral edge of the central corner portion is formed into an arc shape having an arc center point on the inner side of the lens due to processing technology restrictions. Therefore, it is not possible to provide a holding part or fixing means with the conventional eyeglass-shaped spectacle lens as it is, or to expand the width of the side near the center and widen the field of view of the spectacle lens. . Therefore, if the conventional lens shape is used as it is, the visual field near the center of the spectacle lens becomes narrow, and a sufficient visual field cannot be secured. This is because it was thought that such a restriction could not be avoided with a specific eyesight correction tool called glasses. The limitation of the above processing technology is that, when trying to form a protruding shape part as a holding part at the corner part of the spectacle lens, unlike the conventional case, a center point of the center of the circular arc is located at the position outside the lens. This is because it is necessary to form a reverse arc-shaped portion having the above-mentioned, and such processing is conventionally impossible.

The first problem to be solved by the present invention is to attach and fix to the lens frame without causing distortion of the spectacle lens with respect to the spectacle lens with left and right degrees, paying attention to the above various problems. The lens is fixed with a fixed piece as a fixing means to obtain a configuration that can widen the field of view by expanding the width of the lens side including the lens corner portion closer to the center of each spectacle lens. It is to obtain a lens distortion preventing structure of spectacles that is used as a fixing means by using an engaging piece formed on the inner peripheral surface of the lens frame so as to be engaged over the entire circumference of the spectacle lens. In addition, the second problem to be solved by the present invention is to further enlarge the field of view of the lens corner portion near the center with spectacle lenses with left and right degrees, and attach the spectacle lenses detachably to the lens frame. It is possible to obtain a lens distortion preventing structure for spectacles that can be used and a plurality of types of spectacle lenses can be used properly according to time and place . Furthermore, a third problem to be solved by the present invention is a characteristic shape that constitutes the present invention by forming a reverse arc upper portion having a center point of the arc center at a position outside the lens, which has been impossible in the past. An eyeglass lens cutting method for producing a spectacle lens is obtained.

The present invention includes, as a means for solving the first problem, an integrated lens frame for mounting spectacle lenses for both left and right eyes, the spectacle lens expands the side on the center side in the width direction, and the upper side The corner of the corner is extended to the center bridge position as a corner portion, a reverse arc-shaped curved portion is formed on the lower side of the corner portion, and an extension end is formed at the end thereof. The lens distortion preventing structure of the spectacles is configured such that the outer periphery is fixed to the lens frame by fixing means that does not cause distortion of the spectacle lens.

  The lens distortion preventing structure for spectacles of the present invention having the above-described configuration prevents the distortion of the spectacle lens, which may occur by forcibly fitting the spectacle lens into the lens frame in the conventional spectacles, The eyeglass lens is stably fixed to the lens, and the field of view is enlarged by widening the lens width at the center of the eyeglass. For this reason, the spectacle lens expands the side on the center side in the width direction, extends the intersection of the upper side and the side to the center bridge position, and forms a reverse arc-shaped curved portion on the lower side of the corner Thus, an extended end was formed at the end.

As means for solving the above second problem, in the lens distortion preventing structure for eyeglasses, the fixing means may be a lens fixing means for fixing the extended end of the corner portion with a fixing piece. In the case of such a spectacle lens distortion prevention structure, as fixing means, a groove is formed at the extended end of the corner portion of the spectacles, and the lens fixing means has two fixing pieces on the surface facing the bridge portion of the lens frame, A fixed piece in the shape of a frame is attached to the back of the bridge part, the eyeglass lens is clamped by fastening both fixed pieces with the minimum allowable number of screws, and the protruding strip formed on the back of the fixed piece A lens distortion preventing structure for eyeglasses configured to fix the eyeglass lens by fitting into the groove can be provided. However, the spectacle lens is intended for a lens with a prescription power.

  In the structure for preventing distortion of the spectacle lens having such a configuration, the corner portion extends to the position of the bridge portion at the center of the lens frame to form a corner portion shaped like the base of a bow blade of a bow, and is opposite to the lower side of the corner portion. By forming an arcuate curve portion and forming an extended end at the end thereof, the side on the center side is wider than before, so that glasses are formed with a wide lens width and a wide field of view. Also, with this anti-distortion structure, the field of vision of both the left and right eyes is much wider than that of conventional glasses with a general shape, and the front surfaces of both left and right eyes are formed by an integrated lens frame without causing distortion in the spectacle lens. With a wide field of view and shape. There are lens fixing means such as a tightening method using screws and a method of inserting into the gap between the bridge portion and the stopper portion, but in the case of a tightening method using screws, the corner portion is extended for a pair of spectacle lenses. The fastening of the spectacle lens that fixes the end can be easily released with a minimum number of screws, and each of the spectacle lenses can be removed.

  Accordingly, if a screwdriver for rotating a small screw is always owned in the spectacle case, the spectacle lens can be replaced with a different type of spectacle lens by removing the minimum number of screws of about two. As the fixing means, the lens fixing means is formed from a U-shaped stop member protruding from the surface of the bridge portion, and the extended end of the corner portion of the spectacles is inserted into the gap between the stop member and the surface of the bridge portion. Thus, the lens can be fixed so as to be an insertion type lens fixing means. In this case, it is only necessary to insert the tip of the corner portion of the lens into the gap. Further, the fixing means engages the engaging convex side or the engaging concave side formed on the inner peripheral surface of the lens frame over the entire circumference with a predetermined gap with respect to the outer periphery of the spectacle lens. It can also be formed as a fixing means.

Thereby, the spectacles of the form which can be replaced with a plurality of types of lenses can be obtained. When a spectacle lens uses a polarizing lens, it appears to be colored light yellow or light brown, but the color of the lens changes variously by selecting various polarization states. In addition, if a plurality of spectacle lenses are prepared in a spectacle case, the type of lens can be properly used depending on the use state of the spectacles. Various types of spectacle lenses can be used depending on when and where they are used. For this purpose, it is necessary that the cost for each type of the lens frame and the plurality of types of spectacle lenses is low and the replacement is easy. Of these, the lens frame can be easily integrally molded by known injection molding.

Therefore, as means for solving the third problem, a cutting method in which an approximate outer peripheral shape of the spectacle lens is ground by a grinder with a grindstone, and each corner portion of the spectacle lens is finely processed by an end mill. A spectacle lens having a characteristic shape constituting the present invention is manufactured. The spectacle lens manufactured by this method has an outer peripheral surface that is formed into a flat surface or a mirror surface. Not given. For this reason, the whole cost can be manufactured at low cost. Further, since the lens fixing means is used, the replacement work is simplified. Therefore, in the conventional spectacles, a new usage method is proposed in which a plurality of spectacle lenses are arranged and a plurality of types of spectacle lenses can be used by replacing one lens frame according to time and place. .

  The eyeglass lens distortion preventing structure of the present invention includes a lens frame that is integrally formed with the right and left eyeglass lenses, the eyeglass lens expands the side on the center side in the width direction, and the intersection of the upper side and the side side Is extended as a corner part to the center bridge position, an arcuate curved part is formed on the lower side of this corner part, an extension end is formed at the end, and the extension end of this corner part or the outer periphery of the spectacle lens is distorted to the spectacle lens. Since it is configured to be fixed to the lens frame by a fixing means that does not cause a problem, the spectacle lens is attached and fixed to the lens frame without causing distortion to the spectacle lens with left and right degrees. There is an advantage that a lens distortion preventing structure for eyeglasses that can widen the field of view by widening the side of the lens including the lens corner portion closer to the center can be obtained.

In the above configuration, the lens fixing means for detachably fixing the left and right spectacle lenses at the center bridge position is provided as an integral configuration with the lens frame, and the spectacle lens has a central bridge at the intersection of the upper side of the central side and the side side. By extending the corner part to the position and fixing the extension end of the corner part with lens fixing means , the field of view of the lens corner part near the center can be expanded with the right and left eyeglass lenses. There is an advantage that the spectacle lens can be detachably attached to the lens frame without causing distortion to the lens, and a plurality of types of spectacle lenses can be used properly according to time and place.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is an external perspective view of the lens distortion prevention structure A1 for eyeglasses according to the first embodiment as viewed from the front side, FIG. 2A is a front view, FIG. 2B is a rear view, and FIG. 3 is a rear side. It is the external appearance perspective view seen from. As shown in the figure, the lens distortion prevention structure A1 for spectacles is intended for general spectacles having a pair of spectacle lenses 1 and 1 having a prescription power (any of hyperopia, myopia, presbyopia) (prescription). It is the same in other embodiments to be described later that the lens with the power having the power is the same), and unlike the lens frame 2 of the conventional spectacle lens 1 and 1 with the power, The lens fixing means 3 is provided at the position of the bridge portion 2B. In the illustrated example, the lens frame 2 is formed by integrally molding a synthetic resin frame with a pair of spectacle lenses 1 and 1 with left and right degrees, and hinges provided at the ends of the wiping parts 4 and 4 respectively. A temple 6 extending from 5 to the back of the face, a modern portion 7 at the tip thereof, and a pad 8 for supporting a portion hitting the nose are provided. Reference numeral 9 is a decorative mark, and 10 is an outer lens stopper.

  As will be described later, the eyeglasses stably fix the eyeglass lenses 1 and 1 to the lens frame 2 while preventing distortion caused by forcibly fitting the eyeglass lenses 1 and 1 to the lens frame. The lens width at the center position is widened to realize a wider field of view. The pair of spectacle lenses 1 and 1 with the above degree is a conventional spectacle lens having a substantially trapezoidal shape (ball shape) in which a circular curved portion whose upper side is slightly longer than the lower side is connected. Whereas the corner portion where the upper side and the side side closer to the center intersect with each other is formed as a rounded curved shape, in this example, the corner portion is a bridge portion at the center of the lens frame 2. 2B, the corners 1a and 1a are shaped like the base of a bow blade of a bow, and the reverse arc-shaped curved part 1r is formed on the lower side of the corner 1a, and the extended end 1b is formed at the end. The reverse arc-shaped curved portions 1r of the spectacle lenses 1 and 1 are connected to form an arch-shaped arc portion as a whole, whereby the side 1s on the center side is significantly wider than the conventional spectacles, so that the lens width is increased. It is formed as glasses with a wide field of view. Each of the extended ends 1b of the corner portions 1a and 1a extends to a position 1e where the ends of the pair of spectacle lenses 1 and 1 with a degree meet each other.

  The shape of the upper side 1u, the lower side 1d, the side 1s (inner side), and 1t (outer side) of the outer peripheral shape of the spectacle lenses 1 and 1 other than the above-described corner portions 1a is as described later in this example. The entire outer periphery including 1a is formed by cutting with an end mill. In the illustrated example, the lens frame 2 has a full rim frame shape in which the entire circumference of the outer periphery of the pair of left and right eyeglass lenses 1 and 1 is surrounded by an integral frame material, and a plastic material made of synthetic resin is used as the material. , Including the bridge portion 2B at the center and the wisdom portion 4, and formed into an integral shape corresponding to the pair of left and right eyeglass lenses 1 and 1. At the position of the bridge portion 2B, the upper side of the frame member and the inside of the eyeglass lenses 1 and 1 The upper ends of the frame members along the side sides 1s, 1s are formed continuously horizontally with a predetermined distance from the upper side. Further, in the illustrated spectacle lenses 1 and 1, the curvature of the lens frame 2 is about 6 curves, whereas the curvature different from this is formed in the number of curves of about 4 curves.

  The lens frame 2 has a size inside the frame, except for each side edge 1t of the spectacle lenses 1 and 1, all other outer peripheries are identical to or substantially coincide with the outer peripheral shape of the spectacle lenses 1 and 1. However, it is not tight enough to fit into the lens frame 2 in an interference fit, and it fits with a very small gap (microns to millimeters) that cannot be seen. The eyeglass lenses 1 and 1 are fitted in the lens frame 2 so that they are flush with each other from the center of the eyeglass lens 1 to the eyeglass center position. It protrudes slightly outside the lens frame 2). On the side 1t, the lens frame 2 is formed slightly smaller than the outer periphery of the spectacle lenses 1 and 1, and the outer side of the spectacle lenses 1 and 1 protrudes outside the lens frame 2 on this side and is slightly over. Designed to wrap and slightly overlap each other. Further, the shape of the wisdom portions 4 and 4 on the side of the lens frame 2 is formed in a shape having a larger spread than usual in consideration of the novelty of the design of the entire lens frame 2.

  The frame thickness of the lens frame 2 is made of an elastic plastic material with a hard thin plate thickness of about 2 mm in order to emphasize the design of sunglasses style. It is formed by a manufacturing method. However, the plate thickness can be variously changed depending on the design of the lens frame 2. The material of the lens frame 2 is not limited to plastic, and a metal frame may be used as long as the same design and shape such as gold, titanium alloy, and nickel alloy can be formed. The lens fixing means 3 is fixedly attached to the bridge portion 2B at the center of the lens frame 2 in order to fix the spectacle lenses 1 and 1 to the lens frame 2. The lens fixing means 3 includes two fixing pieces 3a on the front side and a small frame-shaped fixing piece 3b attached to the back side. The upper and lower bridges of the lens frame 2 and the spectacle lens 1 extending to the center position. It fixes so that both may be pinched | interposed with respect to this corner part 1a.

  By simply tightening and fixing each corner portion 1a of the spectacle lenses 1 and 1 with the lens fixing means 3, the spectacle lenses 1 and 1 can be fixed. However, in consideration of safety and giving a sense of security, In the example shown in the drawing, lens detents 10 are respectively provided on the front surfaces of the wisdom portions 4 and 4 in correspondence with the intermediate position of the side 1t of the spectacle lens. In the example shown in the figure, the wisdom part 4 is formed in a substantially triangular shape on the side face toward the back in order to have a sunglasses-like design, and a decoration mark 9 is attached to the center position of the outer face. A hinge 5 for fixing the base portion of the temple 6 to the inside of the face so as to be rotatable toward the inside of the face is fixed by a screw at a position corresponding to the back surface of the decoration mark 9, and this screw penetrates the material of the wiping portion 4. It is attached to fix the decorative mark 9.

  The temple 6 is greatly curved in a straight line when viewed from the side and toward the rear of the head as a whole in a plan view, but the temple end 11 in a length portion from the half of the temple 6 toward the tip is formed in a substantially straight line. Has been. The temple end 11 is formed by forming a plurality of ridges and depressions 12 (convex portions 12a and valley portions 12b) in the length portion thereof, and attaching the mountain-shaped modern 7 to the temple end 11. . The modern 7 has annular rings 13a, 13a formed of elastic materials at both ends thereof, and the annular rings 13a, 13a are integrally connected to a downward convex mountain by a flexible linear member 13b. The annular ring 13a is formed so that the shape of the chevron can be changed, and the inner hole is inserted into and fitted into the trough-shaped trough portion 12b of the temple end 11.

  The temple 6 is provided so that the length of the modern section can be adjusted freely so that adults and children can fit the size of each person's eyes to ears. The linear temple end 11 of the temple 6 does not need to be greatly bent as in the prior art, and the modern 7 shape provided separately from the temple end 11 provides a feeling of fitting when attached to the auricle. This is because it is high and has a new design. The modern 7 of the temple end 11 forms a length adjustment structure, and according to this length adjustment structure, it can be used in a state where the standard state is different from the tension state.

  In the standard state, the rear annular ring 13a (front end side) is fitted to the rearmost valley portion, and the front annular ring 13a is fitted to the valley that is the fewest from the front among the front valleys. Normally, this state is the optimal position for using the glasses, and the bent part of the front of the linear member 13b comes into contact with the rear part of the auricle, causing a catch on the ear. When exercising for sports or the like, or for some necessity, when it is desired that the wearing state of the glasses is attracted to the nose to be stabilized firmly, the above-mentioned length adjusting structure allows the rear annular ring 13a to be fitted to the fitting position. It moves forward within a range of several places, deforms the chevron shape of the linear member 13b into a steep angle, and increases the contact pressure on the front pinna of the chevron shape. Further, if necessary, the deep mountain-shaped linear member 13b is moved forward so as to increase the degree of contact with the auricle.

  FIG. 4 shows an enlarged detailed view of the lens fixing means 3. As described above, the lens fixing means 3 includes the two fixed pieces 3a on the front side and the small frame-shaped fixed piece 3b attached to the back side. In FIG. The partial expanded front view of FIG. 1, (b) The sectional view from arrow BB of the figure (a) is shown. As shown in the figure, the fixed piece 3b is a rectangular member having an outer shape of approximately 1 cm formed in a rectangular shape with a thin strip in an actual example (partially broken in the figure). A small screw 3n is screwed into the screw hole at the four corner positions, and the two fixed pieces 3a, 3a and the fixed piece 3b on the front side are connected by the screw 3n, and the two fixed pieces 3a, 3a˜ The corner portions 1a of the pair of spectacle lenses 1 and 1 are fixed by sandwiching the lens frame 2 between 3b.

  The two fixed pieces 3a and 3a on the front side are formed in the shape of a vertically long convex piece in terms of design, but it is also possible to form both pieces in one shape with another design. Further, as shown in FIG. 2A, the corner portion 1a of the spectacle lens 1 is formed in a butted shape with its extended end 1b extending to a position 1e where the center is butted. However, it is not an essential condition that the extended end 1b has a butted shape, and it is sufficient that the extended end 1b extends sufficiently to be fixed by the lens fixing means 3. Then, on the front side surface of each corner portion 1a of the pair of spectacle lenses 1 and 1, as shown in the partially enlarged view of FIG. 2B, one lens is provided in the vicinity of the intermediate position of the extended end 1b. Shallow vertical grooves 1x are formed, and convex strips 3x and 3x are formed on the opposing surfaces of the fixed pieces 3a and 3a that face the fixed piece 3b at the time of fastening, respectively.

  Accordingly, when the corner portion 1a is fixed by being sandwiched between the fixing pieces 3a, 3a and 3b, the corner portions of the pair of spectacle lenses 1 and 1 are fitted by fitting the convex strips 3x into the longitudinal grooves 1x. 1 a is firmly fixed to the lens frame 2 by the lens fixing means 3. The thin frame material of the fixed piece 3b is formed thicker than the lens frame 2, which is covered with a pad 8 on a bar-shaped piece 3c extending downward from both ends of the lower side of the fixed piece 3b. This is for wearing. That is, the rod-like piece 3c is formed so that the side of the lens frame 2 on the center side is attached substantially parallel to the side extending in an inclined manner from the bridge portion 2B at the center position. This is because it is necessary to provide a gap for attaching / detaching to the lens frame 2 when the pad 8 is attached.

  The rod-like piece 3c is formed of the same material and shape as the fixed piece 3b, and is formed as a rod-like body extending downward from both ends of the lower side of the fixed piece 3b. The pad 8 is made of rubber. The pad 8 has flexibility, but uses a slightly hard rubber material, has a hollow shape with one end closed, and has an outer shape that is substantially oval suitable for a nose pad, and a portion that hits the nose is a curve suitable for the shape of the nose. It is shaped into a shape. When the pad 8 is attached to the bar-shaped piece 3c, the pad 8 is inserted into the bar-shaped piece 3c from the open end of the pad 8 and fixed. Therefore, when the pad 8 becomes dirty, only the pad 8 can be pulled out from the bar-shaped piece 3c and the attached dirt can be wiped off.

  4 (c) and 4 (d) show modified examples of the lens fixing means 3. FIG. In this example, a vertical groove 1x is formed on the back surface of the extended end 1b of the corner portion 1a of the spectacle lens 1, 1, and the protruding strips 3x, 3x corresponding to the vertical groove 1x are formed on the lens frame 2 of the fixed piece 3b ′. An example is shown in which the eyeglass lenses 1 and 1 are fastened by a fixing piece 3b ′ from the opposite direction (back side) to the above-described embodiment and formed on opposing surfaces. In this case, the two fixed pieces 3a ′ on the front side have the same external shape as the fixed piece 3a of the above embodiment, except that the convex strips 3x and 3x are not provided on the back surface, but the spectacle lens 1, Any other shape may be used as long as 1 can be fastened and fixed between the fixed piece 3b ′ and the fixed shape 3b ′. The shape of the fixed piece 3b 'is basically the same as that of the fixed piece 3b of the above-described embodiment, except that convex strips 3x and 3x are formed on the back surface. When fixing, small screws 3n are inserted into holes at four corner positions of the fixed piece 3b ′, passed through the screw holes 3p of the lens frame 2, and screwed into the fixed pieces 3a ′ and 3a ′ to be fixed. The Any of the above lens fixing means 3 may be used.

  In the eyeglass lens distortion preventing structure A1 of the first embodiment having the above-described configuration, as described above, the pair of eyeglass lenses 1 and 1 has the side sides 1s and 1s on the center side enlarged in the width direction and the center. A reverse arc-shaped curved portion 1r is formed on the lower side of the corner portion 1a extending to the bridge position, an extended end 1b is formed at the end, and the reverse arc-shaped curved portions 1r of both the spectacle lenses 1 and 1 are connected as a whole. Since the arcuate arc portion is formed and the extended end 1b of the corner portion 1a is fixed to the lens frame 2 by the lens fixing means 3 which does not cause distortion in the spectacle lenses 1, 1, the visual field of both left and right eyes Of the corners 1a and the spectacle lenses 1 and 1 are spread out from the central side glasses 1s and 1s. Wide field of view, shape glasses Obtained.

  Since the spectacle lenses 1 and 1 can be fixed simply by fixing the extended ends 1b of the respective corner portions 1a by the lens fixing means 3, the lens frame has convex and concave portions formed by beveling of the outer periphery of the lens with a lens frame. Although it is not necessary to fasten and fix the lens, it is preferable to provide a lens stopper 10 at the opposite end in the event of an unexpected accident such as a collision or striking that cannot be predicted from the outside as actual glasses. By forming the inverse arcuate curved portion 1r, the field of view of the spectacle lenses 1 and 1 is widened, as shown in FIG. 1s ′ is a shape in which circular curves having a center point on the inside are connected (indicated by a one-dot chain line), and the width of the side sides 1s, 1s is formed wider than this, and the corner portion 1a and its extension portion 1b are formed. It is understood from having. Such a broadening of the field of view is as wide as the scenery can be seen from the observatory. Note that the field of view of the spectacle lenses 1 and 1 can be obtained similarly in the case of the spectacle lenses 1 ′ and 1 ′ of the second embodiment described later, as shown in FIG. .

  Further, the eyeglass lens distortion preventing structure A1 can form the inverted arc-shaped curved portion 1r, whereby the extension portion 1b of the corner portion 1a can be formed, and the eyeglass lenses 1 and 1 are fixed to the lens. 3, the eyeglass lens 1 can be fixed to the lens frame 2 by a fixing means that does not cause distortion. By removing at least one of the upper and lower screws from the two screws on one side in the vertical direction of the fixed piece 3b for fixing the back surface of the extension 1b of the corner 1a to the pair of spectacle lenses 1 and 1 The tightening of the corner portions 1a of the lenses 1 and 1 with respect to the extension portion 1b is easily released, and each of the spectacle lenses 1 and 1 can be removed. Therefore, if the screwdriver for rotating the small screw 3n is always held at hand in the spectacle case, the spectacle lenses 1 and 1 can be replaced with different types of spectacle lenses by removing the two screws 3n. Therefore, a type of glasses that can be replaced with a plurality of types of lenses can be obtained.

  Since the spectacle lens shown in the figure uses a polarizing lens, it appears to be colored light yellow or light brown, but the color of the lens changes variously by selecting various polarization states. Moreover, if the spectacle lenses 1 and 1 are prepared in a plurality of spectacle cases, the lens types can be properly used depending on the use state of the spectacles. For example, blue-colored lenses suitable for relaxing when you are tired, polarized lenses that reduce eye fatigue when using a PC, uncolored lenses when going out, parties, etc. Then, like a slightly black sunglasses-like lens, you can use different types of spectacle lenses depending on when and where you use them. For this purpose, it is necessary that the cost for each type of the lens frame 2 and the plurality of types of spectacle lenses 1 and 1 is low and the replacement is easy.

  However, the lens frame 2 is easily integrally formed by injection molding, and as will be described later, the spectacle lens 1 of this embodiment is obtained by grinding an approximate outer peripheral shape with a grinder with a grindstone, and then the spectacle lens 1. 1, each corner 1a is subjected to fine processing by an end mill, and the outer peripheral surface is formed into a flat surface or a mirror surface, and the outer peripheral surface has grooves formed by beveling like a conventional spectacle lens, The complex end face machining surface of the convex part is not given. For this reason, the whole cost can be manufactured at low cost. However, if a cutting edge having a sharp outer peripheral surface is formed, inconvenience occurs in handling at the time of attachment and detachment, and therefore, extremely slight end surface processing is performed so as not to cause scratches on human hands during handling.

  Further, since the lens fixing means 3 is used, the replacement work is simplified. Therefore, the conventional spectacles propose a usage method in which a plurality of spectacle lenses are arranged, and a plurality of types of spectacle lenses 1 and 1 are used for one lens frame 2 according to time and place. This means that the conventional practice of using one kind of eyeglass lens for one lens frame 2 is overturned. As described above, the lens frame 2 has a shape in which the inner size of the lens frame is the same as or substantially the same as the outer shape of the spectacle lens 1 except for the side 1t of the spectacle lens 1. Has been.

  For this reason, in the state where the spectacle lens 1 is fitted in the lens frame 2 and the corner portion 1a is fixed by the lens fixing means 3, the outer surfaces of the spectacle lens 1 and the lens frame 2 are flush (as described above). The lens is stably fixed in a state (from the center of the spectacle lens to the center of the spectacle lens). However, on the side 1t, the side of the corresponding lens frame 2 is formed slightly smaller than the outer periphery of the spectacle lens 1, and the outer side of the spectacle lens 1 protrudes outside the lens frame 2 on this side and overlaps. Designed to overlap, a little. This is because there are restrictions on designing the spectacle lens 1 into a curved surface shape, restrictions for fixing the spectacle lens 1 to the lens frame 2 so as not to cause distortion of the lens, and a large amount in the lens frame 2 such as the lens frame 2 shown in the figure. This is because there is a shift in the development of the shape design that gives a new design such as forming a curved surface, and the shift in the glasses of this embodiment is also used as a new design.

  By adopting such a shape, the design design of the lens frame 2 is separated from the design restrictions of the curved shape of the spectacle lens 1 and the restrictions when fixing to the lens frame, and the design of the lens frame 2 is utilized. Even a general pair of glasses having a pair of prescription glasses 1 and 1 can be given a novel sunglasses-like design to the lens frame 2 as shown. It is. In the above embodiment, the spectacle lenses 1 and 1 have been described on the assumption that a prescription lens is used. However, the lens does not necessarily need to be a prescription lens, and a simple plastic or glass lens is used. Also good. The material of the temple end 11 is the same plastic as that of the lens frame 2, but a metal material such as gold, titanium alloy, or nickel alloy may be used.

  FIG. 5A is an external perspective view of the anti-distortion structure A2 for the spectacle lens of the second embodiment. The distortion prevention structure A2 for the spectacle lens of this embodiment is formed so that the overall impression gives the appearance of Lloyd spectacles. However, in the description of this embodiment, the member shape and size of each detail are slightly different from those of the first embodiment, but the same reference numerals are used for members having the same function except for a part. Similarly to the first embodiment, the anti-distortion structure A2 for the spectacle lens of this embodiment also prevents the lens frame 2 while preventing distortion caused by forcibly fitting the spectacle lenses 1 ′ and 1 ′ to the lens frame 2. In addition, the eyeglass lenses 1 ′ and 1 ′ are stably fixed to each other, and the lens width at the center of the glasses is widened to realize an expansion of the field of view.

  As shown in FIG. 5A, in this example, the prescription spectacle lenses 1 ′ and 1 ′ are provided so as to be detachable with respect to the lens frame 2, and at the position of the bridge portion 2B at the center of the spectacles. The lens fixing means 3 is formed integrally with the lens frame 2 and made of the same material. Similarly to the first embodiment, the lens frame 2 is formed as a full rim shape with the entire frame integrated with the left and right eyeglass lenses 1 ′ and 1 ′. In this embodiment, as the fixing means, the lens fixing means 3 is formed from U-shaped stop members 3a ′ and 3a ′ protruding from the surface of the bridge portion 2B, and the extended end 1b of the corner portion 1a of the spectacles is formed. The stoppers 3a ′ and 3a ′ are fixed by being inserted through a gap between the bridge member 2B and the surface of the bridge portion 2B.

  Also in this case, corner portions 1a and 1a are formed on the upper side of the central side of the spectacle lenses 1 'and 1', and a reverse arcuate curved portion 1r is formed on the lower side of the corner portion 1a and at the end thereof. By forming the extended end 1b and connecting the reverse arcuate curved portions 1r of the spectacle lenses 1 and 1 as a whole to form an arched arcuate portion, the width of the central side 1s is wider than the conventional one. It is formed as glasses with a wide lens width and a wide field of view. The extended ends 1b of the corner portions 1a, 1a extend to a position 1e where the ends of the pair of spectacle lenses 1 ', 1' with a degree meet each other. Further, the reverse arcuate curved portions 1r on the lower sides of the extended ends 1b of the corner portions 1a and 1a are cut using an end mill as arc portions having arc center positions outside the spectacle lenses 1 ′ and 1 ′. It is formed by. In the illustrated spectacle lenses 1 ′ and 1 ′, the curvature of the lens frame 2 is about 4 curves, and the number of curves corresponding to this is formed.

  The eyeglass lenses 1 ′ and 1 ′ are smaller in the vertical size than the first embodiment, and have an elongated design shape. FIG. 5B is an external perspective view (viewed slightly obliquely) from the back side of the spectacle lenses 1 ′ and 1 ′. The corner portions 1a and extended ends 1b of the spectacle lenses 1 ′ and 1 ′ have substantially the same shape as that of the first embodiment. An inverted arc-shaped curved portion 1r is formed on the lower side of the corner portion 1a, and the extended ends are formed at the ends. By forming 1b, the side 1s on the center side is wider than before, and thus the glasses are formed as glasses having a wide lens width and a wide field of view. The same is also true in that the extended ends 1b of the corner portions 1a, 1a extend to a position 1e where the ends of the pair of spectacle lenses 1 ', 1' with a degree meet each other. The reverse arcuate curved portions 1r on the lower sides of the extended ends 1b of the corner portions 1a and 1a are formed by cutting using an end mill as an arc portion having an arc center position outside the spectacle lenses 1 ′ and 1 ′. Is done.

  The shape of a part of the following frame side 1p outside the extended end 1b is formed in a slightly stepped portion 1ps at the outermost end on the center side, and a notch 1k is provided at the end of the opposite frame side 1p. The outer periphery of the lens is formed to be the same as or substantially the same as the outer peripheral shape of the lens frame 2. However, the longitudinal groove 1x is not provided in the extended end 1b as in the first embodiment. The outer and rear surfaces of the spectacle lenses 1 ′ and 1 ′ are formed as curved lenses having a curved surface similar to a general lens, and a frame side 1 p for mounting on the lens frame 2 on the outer periphery on the rear surface side is on the entire circumference. It is formed in a continuous shape. The frame side 1p has an outer shape and a curved state along the outer shape of the lens frame 2, the width 1B ′ of the frame side 1p is the same as or substantially the same as the frame width 1B of the lens frame 2, and the entire circumference. And a predetermined uniform thickness t (about 1.5 mm in the illustrated example).

  Accordingly, the actual area of the spectacle lenses 1 ′ and 1 ′ is an area obtained by removing the frame side 1 p from the lens outer shape. On the lens back surface side, the curvature of the outer periphery varies depending on the position in order to obtain a lens with a predetermined degree, and the lens thickness increases particularly at the position outside the glasses. However, in order to form the frame side 1p in close contact with the curvature of the surface of the lens frame 2, the thickness portion of the frame side 1p is cut to a predetermined thickness over the entire circumference. For this reason, as shown in FIG. 5B, the thickness portion of the frame side 1p and the thickness portion of the end portion of the spectacle lens 1 'are different, and are formed stepwise in appearance. The spectacle lenses 1 ′ and 1 ′ are fixed by inserting a lens portion projecting stepwise from the frame side 1 p with respect to the lens frame 2 into the inner side of the lens frame 2 in a close contact state. 2 is not tightly fitted so as to be fitted in an interference fit, but is closely fitted so that the eyeglass lenses 1 ′ and 1 ′ are not distorted.

  Similarly to the first embodiment, the lens frame 2 has a lens fixing means 3 integrally formed at the position of the central bridge portion 2B, and the spectacle lenses 1 'and 1' are detachable. As shown in FIGS. 6, 7, and 8, the lens fixing means 3 has a bridge portion 2 </ b> B formed in a small square shape in a front view in this example, and protrudes from the surface of the bridge portion 2 </ b> B in a side view on both sides thereof. The U-shaped stopper members 3a 'and 3a' are provided. In this case, a stopper 10 ′ having a shape corresponding to the notches 1 k and 1 k of the spectacle lenses 1 ′ and 1 ′ is formed on a side portion of the wisdom portions 4 and 4 that is in contact with the outer peripheral surface of the lens. However, since the stopper 10 ′ is formed on the inner surface of the side portion that contacts the lens outer peripheral surface of the wiping portions 4, 4, it cannot be seen from the outside when the spectacles are worn on the face.

  Temples 6 and 4 are rotatably attached with temples 6 via hinges 5 and 5, respectively. As a new design, the temples 6 have a rectangular shape in cross section and are viewed in plan view toward the back of the ear. The auxiliary wire 6a is formed in a shape that is greatly curved in any direction as viewed from the side, and has an elongated linear wire 6a having a circular cross section along its lower position. Since the temple 6 is formed to have a large curved length, the boundary line between the temple 6 and the modern portion 7 is not clear, but the curved portion on the tip side from the middle is the modern portion 7. Further, as shown in FIG. 9, a protrusion that fits into a linear groove formed on the surface of the wisdom portions 4 and 4 is formed inside the temple tip protruding from the attachment position of the hinge 5 to the front side of the glasses. When the temples 6 and 6 are opened when the spectacles are worn on the face, the projections can be engaged with the linear grooves so that the temple 6 can be stably locked to the end portions 4 and 4.

  A plurality of shallow vertical grooves are formed on the outer side of the modern portion 7 so as not to be easily removed from the ears, and a design accent is added. The terminal portion is pushed up at a right angle with respect to the temple end 7a, and is inserted into a small hole formed in the temple end 7a. Then, similar to the temple 7 of the first embodiment, the protruding portion 6b is formed with a plurality of valley-shaped uneven portions 12 (convex portions 12a, valley portions 12b), and is inserted through the small holes. The fixing position can be adjusted by pushing and pulling a right-angled corner. Since the plurality of ridges and recesses 12 (convex portions 12a and trough portions 12b) having a mountain-valley shape are inserted in a tightly fitted state with respect to the small holes, the above-described right-angled corners are appropriately pushed and pulled. Can be stopped in position.

  The auxiliary wire 6a approaches the bottom surface of the temple 6 so that there is no gap at the position where the push-up portion 6b is pushed in most, and when it is pulled apart, the auxiliary wire 6a can be set at an appropriate gap from the bottom surface of the temple 6, By adjusting the contact position, the angle of the lens frame 2, that is, the inclination angle with respect to the eyes of the glasses can be adjusted within a minute angle range. The auxiliary wire 6a is made of the same plastic material as that of the lens frame 2 and is soft because it has a small diameter. However, the auxiliary wire 6a has a suitable elasticity and softens the contact when the temple 6 is hung on the ear. Of novelty. In this example, the pad 8 is not integrally formed with the lens fixing means 3 as in the first embodiment, but a rod-shaped piece 3c is integrally formed on the side of the lens frame 2, and this rod-shaped piece. The pad 8 can be detachably attached to 3c. The bar-shaped piece 3c is actually formed in a bulging shape having a semicircular lower end, and is not easily detached when the pad 8 is attached.

The eyeglass lens distortion preventing structure A2 of the second embodiment having the above-described configuration is arranged near the center positions of the eyeglass lenses 1 ′ and 1 ′, similarly to the eyeglass lens distortion preventing structure A1 of the first embodiment. As shown in FIG. 8, the extended end 1b is inserted into the lens fixing means 3 and is detachably mounted. The corners 1a allow the left and right eyes to be viewed from conventional glasses having a general shape. A spectacle having a wide field of view and shape similar to Lloyd spectacles, which is remarkably widened and formed by an integrated lens frame on the front surfaces of the left and right eyes, is obtained. In other words, the anti-distortion structure A2 for the spectacle lens, as described above, expands the side sides 1s, 1s on the center side of the pair of spectacle lenses 1 ′, 1 ′ in the width direction and extends to the center bridge position. A reverse arc-shaped curved portion 1r is formed on the lower side of the portion 1a, an extended end 1b is formed at the end thereof, and the reverse arc-shaped curved portions 1r of the spectacle lenses 1 ′ and 1 ′ are connected to form an arch-shaped arc portion as a whole. The extended end 1b of the corner portion 1a is fixed to the lens frame 2 by the lens fixing means 3 that does not cause distortion in the spectacle lenses 1 ′ and 1 ′.

  For this reason, the field of view of the left and right eyes spreads far more than conventional glasses having a general shape due to the spread of the corners 1a and the sides 1s and 1s on the center side of the spectacle lenses 1 ′ and 1 ′. Glasses with a wide field of view and shape like a sunglasses formed by an integrated lens frame can be obtained. In this case, the eyeglass lenses 1 ′ and 1 ′ are fixed to the extended ends 1 b of the respective corner portions 1 a by the lens fixing means 3, and are fixed by the lens removal stopper 10 ′ at the opposite end. By adopting such a fixing means, an unexpected accident such as an unpredictable collision or blow from the outside is dealt with. In this embodiment, since the lens fixing means 3 is detachable, the spectacle lenses 1 'and 1' can be detachably attached to different types of spectacle lenses. Therefore, a type of glasses that can be replaced with a plurality of types of lenses can be obtained.

  In this example as well, since the illustrated spectacle lens uses a polarizing lens, it appears colored in light yellow or light brown, but the color of the lens changes variously by selecting the polarization state in various ways. In addition, if a plurality of spectacle lenses 1 ′ and 1 ′ are prepared in a spectacle case, the type of lens can be used in various ways depending on the use state and location depending on the use state of the spectacles. The cost for each type of the lens frame 2 and the plurality of types of spectacle lenses 1 ′ and 1 ′ needs to be low and easy to replace. However, in this example as well, the lens frame 2 is simply integrally formed by injection molding, and the spectacle lenses 1 ′ and 1 ′ of this embodiment are obtained by grinding an approximate outer peripheral shape with a grinder using a grindstone, and further by the spectacle lens 1 ′. Each corner portion 1a of 1 'is finely processed by an end mill, so that the outer peripheral surface is formed into a flat surface or a mirror surface, and the outer peripheral surface has grooves formed by beveling like a conventional spectacle lens. The complicated end face machining surface of a convex part is not given.

  For this reason, the whole cost can be manufactured at low cost. However, if a cutting edge having a sharp outer peripheral surface is formed, inconvenience occurs in handling at the time of attachment and detachment, and therefore, extremely slight end surface processing is performed so as not to cause scratches on human hands during handling. Further, since the lens fixing means 3 is used, the replacement work is further simplified as compared with the case of the first embodiment. Therefore, in the conventional spectacles, a plurality of spectacle lenses are prepared, and a plurality of types of spectacle lenses 1 ′ and 1 ′ are used for one lens frame 2 according to time and place. This would overturn the custom of using one kind of prescription eyeglass lens for one lens frame 2 in the past. As described above, the size of the lens frame 2 inside the frame is the same as or almost the same as the outer shape of the spectacle lens 1 ′ except for the side 1t of the spectacle lens 1 ′. It is made into a shape.

  When the spectacle lenses 1 ′ and 1 ′ are attached to the lens frame 2, the notch 1 k of the lens end is first inserted into the end portions 4 and 4 of the end of the lens frame 2 so that the entire lens is brought into contact with the lens frame 2. When the lens is forcibly pressed in a state where the opposite end of the lens frame 2 is in contact with the U-shaped stoppers 3a ′ and 3a ′ of the lens fixing means 3 on the center side of the lens frame 2, Since the frame 2 is elastic, it is inserted into the U-shaped stoppers 3a ′ and 3a ′ in a slightly curved state. Once inserted, the thickness back surface of the frame side 1p of the spectacle lenses 1 ′ and 1 ′ abuts the lens frame 2, and the lens part thickness portion excluding the frame side 1p fits within the inner method of the lens frame 2. It is fitted in close contact. Accordingly, the eyeglass lenses 1 ′ and 1 ′ are fixed to the lens frame 2 by fitting the lens fixing means 3 and the wiping portions 4 and 4 into the notch 1 k.

  On the contrary, when removing the spectacle lenses 1 ′, 1 ′ from the lens frame 2, simultaneously pulling toward the outside of the spectacle lens so as to separate the corner portion 1a of the lens from the U-shaped stop members 3a ′, 3a ′, If the entire lens frame 2 is slightly curved, it can be easily removed. In the above-described embodiments, the anti-distortion structures A1 and A2 for the spectacle lens have been described in which the lens frame 2 has a shape along the entire circumference of the lens. However, the lens frame 2 is actually a spectacle lens 1 ′, 1 For the part corresponding to the lower half, a frame material is not necessarily required, and the lens frame can be omitted like a so-called nyroll in which the lower half is suspended by nylon.

  FIG. 10 is a comparative view of the spectacle lenses 1, 1 ′ of the first and second embodiments with respect to the conventional example, FIG. 11 is (a) the spectacle lens 1 of the first embodiment, and (b) the second embodiment. The shape of the cutting process of the spectacle lens 1 ′ in the form is shown in FIG. 12, which is a schematic diagram for explaining the processing method. As shown in FIG. 10, the lens material 42 has a circular shape, and as described above, it can be seen that the sides 1s and 1s are wider and have a wider field of view than the conventional lens shown by dotted lines. In addition, the reference lines S0H and S0v indicated by the one-dot chain line in the drawing are processed by a grinder, and the subsequent processing is performed based on the reference line. In addition, as a prescription lens, the surface and the back surface that have been subjected to the necessary curved surface processing are cut through roughing and fine processing as processing before processing into the final spectacle lenses 1 and 1 ′. Processing shall be performed.

  In this case, the rough-processed lenses L0 and L0 ′ are performed by a grinder using a grindstone (not shown), and are cut into a rough shape excluding the corner portions 1a, the extended ends 1b, and the notches 1k of the spectacle lenses 1 and 1 ′. Processing is performed. Next, the fine processing is performed using an end mill 40 as shown in FIG. Then, as shown in FIG. 11 (the example shown is the lens 1 ′ of the second embodiment), when the fine processing is performed, the roughly processed lenses L0 and L0 ′ are placed on the curved receiving member 41. The corner portion 1a, the extended end 1b, and the notch 1k are cut using an end mill 40 as a cutting tool. The suction means 43 is connected to a suction pump (not shown), and is sucked and fixed to the receiving member 41 with a suction force that does not damage the lenses L0 and L0 '.

  In this processing, in order to perform slight thread surface processing so that a sharp edge portion does not occur on the outer peripheral end surfaces of the spectacle lenses 1 and 1 ′ during the fine processing, the end mill 40c ′ has at least four types of shapes. The end mill 40c ′ shown in the figure has a curved outer peripheral blade surface, and various other shapes having different blade surface diameters are also used. In addition, for example, the inner corner portion of the notch 1k of the spectacle lens 1 ′ is an end mill having a small radius of 1.5 mm and the corner portion of the stepped portion 1ps. Is an end mill having a radius of 0.5 mm, etc. The end mill 40c ″ is an end mill for cutting the frame side 1p. In order to perform cutting with the edge of the end mill, the conventional grinder can only process the outer periphery of the lens into a circular shape with a gentle arc-shaped curve with the center of the arc radius at the center of the lens. Even small cutting shapes such as 1a, the extended end 1b, and the notch 1k can be processed in detail.

In the examples of the above embodiments, in each case, the example including the wisdom portions 4 and 4 is shown. However, the wisdom portions 4 and 4 and the hinges 5 and 5 are not necessarily provided and can be bent freely. The ends of the temples 6 and 6 are directly connected to the side of the lens frame 2, and these members may be omitted. Further, the spectacle lenses 1 and 1 ' are enlarged in the width direction at the center side including the corner portion 1a, an inverted arc-shaped curved portion is formed on the lower side of the corner portion 1a, and an extended end 1b is formed at the end. The corner portion 1a is extended and the outer periphery 1b of the spectacle lens or the outer periphery of the spectacle lens is fixed to the lens frame 2 by a fixing means that does not cause distortion of the spectacle lens. However, there are various variations of this shape. Therefore, those modifications are included in the scope of the present invention as long as they are within the scope of the present invention.

  The eyeglass lens distortion preventing structure of the present invention includes an integral lens frame for mounting the right and left eyeglass lenses, and the eyeglass lens expands the side on the center side in the width direction, and intersects the upper side and the side side. A reverse arc-shaped curved part is formed on the lower side of the corner part formed by extending the part to the center bridge position, and an extension end is formed at the end, and the extended end of this corner part or the outer periphery of the spectacle lens is distorted to the spectacle lens. It is fixed to the lens frame by a fixing means that does not occur, and it is mounted and fixed to the lens frame without causing distortion with respect to the right and left spectacle lenses, and each center with the spectacle lens The present invention provides spectacles having a lens distortion prevention structure capable of widening the field of view by widening the side of the lens including the close lens corner portion, and can be widely used in the field of spectacle manufacturing.

Overview perspective view seen from the front side of the lens distortion prevention structure of the glasses of the first embodiment (A) Front view, (b) Partial enlarged view of the bridge part, (c) Rear view External perspective view as seen from the back side Partial enlarged view of the lens fixing means same as above (a) Partial rear enlarged view, (b) Cross sectional view from arrow BB, (c) Exploded perspective view of bridge part, (d) Partial plan view of the same (A) Overview perspective view of eyeglass lens distortion prevention structure of second embodiment viewed from front side, (b) Perspective view of back surface of eyeglass lens (A) Partial front enlarged view, (b) Partial rear enlarged view, (c) Partial plan view of spectacles including one half of the spectacle lens Inside side view including a partial cross section taken along the center of the same glasses (A) Partial enlarged external perspective view in the state where the spectacle lens is not mounted, (b) Partial enlarged external perspective view in the state where the spectacle lens is mounted, in the vicinity of the lens fixing means 3 of the above. Appearance perspective view centering on Satoshi 4 of the same glasses The figure explaining the field side expansion of the central side and corner part of the conventional spectacle lens and the spectacle lens of the present invention The figure explaining the lens shape in a lens processing process same as the above ((a) spectacle lens of 1st Embodiment, (b) spectacle lens of 2nd Embodiment) Explanatory drawing explaining the processing of the lens processing step same as above

1, 1 ' spectacle lens 1a corner 1b extended end 1x longitudinal groove 1u upper side 1d lower side 1s, 1t side 1e position 1B frame width 1B' width 2 lens frame 2B bridge 3 lens fixing means 3a fixing piece 3a ' U-shaped stop member 3b Fixing piece 3c Bar-shaped piece 3n Screw 3x Projection strip 4 Satoshi 5 Hinge 6 Temple 6a Auxiliary wire 7 Modern part 7a Temple end 8 Pad 9 Decorative mark 10, 10 'Detachment stop 11 Temple end 12 Uneven Part 12a Convex part 12b Valley part 13a Annular ring 13b Linear member
Lens distortion prevention structure L0, L0 ′ lens for A1, A2 glasses

Claims (5)

Enlarged left 'and, the spectacle lens 1, 1' both eyes independent spectacle lenses 1, 1 provided with a lens frame 2 integrally shaped mounting the spectacle lens 1, 1 'the side of the center side in the width direction In addition, the intersection of the upper side and the side is extended to the center bridge position as a corner portion 1a, a reverse arc-shaped curved portion is formed on the lower side of the corner portion 1a, and an extended end 1b is formed at the end thereof. The extension end 1b of the portion 1a is composed of a fixed piece that is attached to the surface of the lens frame 2 facing the bridge portion 2B and a fixed piece on the back surface of the bridge portion, and both fixed pieces are fastened with a minimum allowable number of screws. A lens distortion preventing structure for eyeglasses configured to be fixed to the lens frame 2 by the fixing means 3 for holding the eyeglass lenses 1 and 1 ′ . In the fixing means , the spectacle lens 1 is fixed by forming a groove portion 1x in the extended end 1b of the corner portion 1a of the spectacle lens and fitting a convex strip 3x formed on the back surface of the fixing piece 3a into the groove portion 1x. The lens distortion preventing structure for eyeglasses according to claim 1, which is configured as described above. The lens distortion preventing structure for eyeglasses according to claim 1, wherein the fixing means 3 is formed of U-shaped stopper members 3a 'and 3a' protruding from the surface of the bridge portion 2B, and is a corner portion of the eyeglass lens. 2. The lens distortion preventing structure for spectacles according to claim 1, wherein the extended end 1b of 1a is inserted and fixed in a gap between the stopper members 3a 'and 3a' and the surface of the bridge portion 2B . 4. The lens distortion prevention of spectacles according to claim 1, wherein the extended ends 1b of the corner portions 1a extending to the central bridge position of the spectacle lenses 1 and 1 ' are formed in a butted shape 1e. Construction. A first method of cutting the spectacle lenses 1 and 1 'according to claim 1 or 2, wherein the circular lens material L0 and L0' is roughly processed into a rough shape using a grinder. And a second step of performing fine processing including the formation of an arc portion forming an inverted arc-shaped curved portion having an arc center position on the outer side of the spectacle lens at the lower side of the corner portion 1a using an end mill. A method of cutting eyeglass lenses.

Images