JPH10293272A - Holding structure of spectacle lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely join lenses and a frame with large surfaces and to prevent the impairment of appearance by press fitting the holding pieces of the frame to the fitting parts disposed at the coupling parts of the lenses. SOLUTION: A pair of the holding pieces 8 holding the lens 2 from the front and rear surfaces are formed to a fork shape at a wraparound endpiece 4 by providing these pieces with the spacing corresponding to the thickness of the fitting part 9 of the lens 2 in-between. After the fitting part 9 is press fitted therebetween, the wraparound endpiece 4 and the lens 2 are integrally fixed by an adhesive. The lens 2 is recessed with the coupling recessed parts 12 having the area corresponding to the projection area of the holding pieces 8 and having the depth corresponding to the thickness of the holding pieces 8 on the front and rear surface of the side edge part 3a of the temple. The thick fitting part 9 coupling to the wraparound endpiece 4 is formed between these coupling recessed parts 12. At the time of machining the coupling recessed parts 12, radii 12a as large as possible are formed at their inside corers, by which the occurrence of the stress concentration in these parts is avoided as far as possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spectacle lens holding structure, and more particularly, to a frameless type spectacle lens holding structure characterized by a structure for connecting a frame to an edge of the lens.

[0002]

2. Description of the Related Art Borderless glasses are excellent in widening the field of view and reducing the weight, but have a problem in the strength of connection with the frame because there is no rim for holding the periphery of the lens.

To solve such a problem, for example, Japanese Patent Application Laid-Open
Japanese Patent Publication No. -230062 discloses a pin hole formed in a joint edge portion with a frame in parallel with a lens surface, and a pin of a patch plate is inserted into the pin hole and fixed. The frame is fixed to the frame.

However, in such a holding structure,
Since the connection between the lens and the frame depends only on the pin pressed into the pin hole, not only the contact area of the connection part is small and the bonding force is weak, but also the pin hole extending inside the lens can be seen from the front Therefore, there is a problem that the appearance is impaired.

[0005] Further, in the case where the joining edge of the lens is sandwiched from both sides by sandwiching pieces provided on the frame and joined by screws, the screw hole is not visible, but the head of the screw is exposed on the surface of the frame. This has the problem of damaging the appearance.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem.
An object of the present invention is to provide a structure for holding a spectacle lens that can firmly join a lens and a frame on a large surface and does not impair the appearance.

[0007]

In order to achieve the above object, the present invention provides a frameless eyeglass of the type in which a frame is directly connected to an edge of a lens. While the holding piece that is sandwiched from is provided, the coupling portion of the lens includes the front surface and the back surface of the lens.
A concave portion having an area corresponding to the projection surface of the holding piece is provided on one side or both sides, and the holding piece is press-fitted into a fitting portion formed by the recess to integrally connect the lens and the frame.

[0008]

Embodiments of the present invention will be described below. 1 to 3 show an embodiment of the present invention. In the drawings, reference numeral 1 denotes an eyeglass body, which is fixed to a pair of left and right plastic lenses 2, 2 and these temple side edges 3a, 3a. And a pair of left and right frames 4 and a pair of hinges 5 and 5,
4 and a bridge 7 which is fitted and fixed to the nose side edges 3b, 3b of the lenses 2, 2 which also form a frame.

FIG. 3 shows this yoroi.
A pair of holding pieces 8, 8 for holding the lens 2 from the front and back surfaces are formed in the fork 4 in the fork shape with a gap corresponding to the thickness of the fitting portion 9 of the lens 2. The fitting portion 9 is press-fitted into the housing 2 and the yoro 4 and the lens 2 are integrally fixed via an adhesive.

On the other hand, the lens 2 has an area corresponding to the projection surface of the holding pieces 8 on the front and back surfaces of the temple side edge 3a and a depth corresponding to the thickness of the holding piece 8. It is configured such that connecting recesses 12 having a thickness are provided, and a thick fitting portion 9 that is connected to the yoke 4 is formed between the connecting recesses 12.

In cutting the joint recess 12, a radius 12a as large as possible is formed at the inner corner thereof to minimize stress concentration at this portion. The thickness of the formed fitting portion 9 is made at least 1.0 to 2.0 mm so as to increase the strength of the fitting portion 9 as much as possible.

Also, if necessary, a coupling recess is formed in the nose side edge 3b of the lens 2 similarly to the temple side edge 3a.
A fitting portion for connecting the bridge 7 is formed between these connection concave portions.

In the embodiment constructed as described above, the holding pieces 8, 8 from the outer peripheral surface of the lens 2 are inserted into the coupling concave portions 12 formed on the front and back surfaces of the lens 2 on the temple side edge 3 a side.
Is pressed in, the holding pieces 8, 8 sandwich the fitting portion 9 from the front and back surfaces, and the wide frictional surface obtained by the large joint surfaces 10 on the inner surfaces of the holding pieces 8, 8 and these peripheral surfaces 11. Both are firmly connected by the surface.

In the embodiment shown in FIG. 4, the fitting portion 29 on the lens 22 side is formed in an inverted trapezoidal shape so that the thickness increases toward the outer periphery, while the inverted trapezoidal shape is formed on the yolo 24 side. In addition to forming the dovetail grooves conforming to the above and connecting them, not only the frictional joining of the holding pieces 28, 28 but also the dropout is surely prevented by this dovetail fitting.

In the embodiment shown in FIG. 5, the fitting piece 49 on the lens 42 side is formed to have a cross-sectionally curved shape such that its thickness decreases from the inner side toward the outer side, while A groove corresponding to the curved surface is formed, and the holding piece 4 is
The adhesive is uniformly interposed between 8, 8 and 48 when they are press-fitted.

Further, the embodiment shown in FIG.
Coupling concave portion 72 having an area corresponding to the projection surface of 8, 68
Is recessed only from the back side of the lens 62, and the holding pieces 68, 68 are press-fitted into a fitting portion 69 formed by the recess 72, thereby integrally fixing the lens 62 and the yoke 64. According to this embodiment, the coupling concave portion 72 is formed only on one side of the lens, so that the labor for forming the concave portion is omitted.

In the above-described embodiment, the case where the coupling concave portion is formed at one position of the coupling edge portion of the lens has been described. However, if the coupling concave portion is formed at a plurality of positions as necessary, it is possible to further improve the structure. A strong holding structure can be provided.

[0018]

As described above, according to the present invention, a holding piece for holding the lens from the front and back surfaces is provided at the front end of the frame, while one of the front and back surfaces of the lens is provided at the joint portion of the lens. A concave portion having an area corresponding to the projection surface of the holding piece was provided on both surfaces, and the holding piece was pressed into the fitting portion formed by the recess and the lens and the frame were integrally connected, so that the projection surface of the holding piece was The lens and the frame can be firmly connected by the large friction surface obtained by the corresponding joining surfaces and these peripheral surfaces.

Further, since the fitting portion provided on the lens and the holding piece provided on the frame are directly connected to each other, the appearance can be made very good, and the thickness of the holding piece corresponds to the thickness of the holding piece on the surface of the lens. When the concave portions are provided and combined, the outer appearance can be formed in a better appearance without projecting the holding piece toward the front surface side of the lens.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the entire configuration of eyeglasses to which the present invention is applied.

FIG. 2 is a perspective view showing a connecting portion of the present invention.

FIGS. 3A and 3B are a cross-sectional view and a front view of a connecting portion.

FIG. 4 is a sectional view showing another embodiment of the present invention.

FIG. 5 is a sectional view showing still another embodiment of the present invention.

FIG. 6 is a sectional view showing still another embodiment of the present invention.

[Explanation of symbols]

 2, 22, 42, 62 Lens 3a Temple side edge 4, 24, 44, 64 Yoro 8, 28, 48, 68 Holding piece 9, 29, 49, 69 Fitting part 10 Joining surface 11 Peripheral surface 12, 72 Coupling Recess 12a

Claims (6)

[Claims] 1. A frameless eyeglass of a type in which a frame is directly connected to an edge of a lens, a holding piece for holding the lens from the front and back surfaces is provided at a front end of the frame, and a connecting portion of the lens includes A concave portion having an area corresponding to the projection surface of the holding piece is provided on one or both surfaces of the front and rear surfaces of the lens, and the holding piece is press-fitted into a fitting portion formed by the recess, so that the lens and the lens A structure for holding a spectacle lens, wherein a frame and a frame are combined and integrated. 2. The fitting portion has a thickness of 1.0 to 2.0.
The holding structure for a spectacle lens according to claim 1, wherein the length is set to mm. 3. The spectacle lens holding structure according to claim 1, wherein a radius is provided at an inner corner of the concave portion. 4. The lens according to claim 1, wherein a concave portion having an area corresponding to a projection surface of the holding piece and a depth corresponding to a thickness of the holding piece is provided on a surface of the lens. Eyeglass lens holding structure. 5. The holding structure for a spectacle lens according to claim 1, wherein the fitting portion is formed to have an inverted trapezoidal cross section so that the thickness increases from the inner side toward the outer side. 6. The holding structure for a spectacle lens according to claim 1, wherein the fitting portion is formed to have a cross-sectional curved shape such that a thickness thereof is gradually reduced from an inner side toward an outer periphery.