JPS63285513A - Spectacle frame component - Google Patents

Abstract

PURPOSE:To obtain a thin, rigid, and lightweight spectacle frame by providing an open loop type lens holding frame and a couple of brow endpieces molded integrally with its open end parts, and forming the lens holding frame so that the sectional area of the narrowest part is 1.5-8mm<2>. CONSTITUTION:The open loop type lens holding frame 2 is used and the couple of brow endpieces 3a and 3b are molded integrally with its open end parts; and the holding frame 2 is so formed that the sectional area of the narrowest part is 1.5-8mm<2>. Further, a screw 4 is engaged threadably with screw holes formed penetrating the brow endpieces 3a and 3b, which are brought into contact with each other to put the holding frame 2 in a closed loop and also clamp the periphery of a lens, thereby preventing the lens from falling from the holding frame 2. Further, the brow endpieces 3a and 3b have the screw holes penetrating the brow endpieces 3a and 3b; and a metallic tube member where the screw 4 is run is inserted into the brow endpiece 3b and a female screw tube member for receiving the screw 4 is inserted into the brow endpiece 3a. Those tube members are insert-molded. Thus, the thin, rigid spectacle frame is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an eyeglass frame component having a transparent and slender lens holding frame.

[Conventional technology and Problems that the invention attempts to solve]

Conventionally, eyeglass frames have been manufactured from metal, synthetic resin (e.g., celluloid, acetylcellulose, epoxy resin, nylon, etc.), tortoiseshell, etc. Metal eyeglass frames are preferred because they can be made slender, and synthetic resin eyeglass frames are preferred. They have been loved for their light weight, and the medium-sized eyeglass frames have been loved for their rarity. However, in recent years, there has been a trend for synthetic resin eyeglass frames to be slimmer, but if they are made thinner, conventional synthetic resin eyeglass frames lack strength, and the lens holding frame may stretch while worn, causing the lenses to come off. There are problems such as making it easier.
Moreover, synthetic resin eyeglass frames are manufactured by injection molding, so if the lens holding frame is made slender, the joint part where the resin injected into the injection mold meets the inside of the mold during injection molding will be particularly strong. There was a drawback that the lens frame was easily damaged in this area. In addition, conventional slender synthetic resin eyeglass frames are made of opaque fiber-reinforced thermoplastic resin, but transparent and slender synthetic resin eyeglass frames can be applied with various patterns and provide more natural patterns. Eyeglass frames were desired.

[Means for solving problems]

In view of the above points, the present inventors conducted extensive research to develop a synthetic resin eyeglass frame that is slender but has sufficient strength.As a result, the strength of the eyeglass frame is such that even the thinnest part has a tensile strength of 10 kg or more. As a result, the tensile strength was 800 kg/- or more, and the flexural modulus was 25,000 kg/-.
By forming the eyeglass frame parts from a transparent thermoplastic resin with a heat deformation temperature of 190°C or higher, it has sufficient strength and elasticity even when the cross-sectional area of the thinnest part is 1.5-1. Moreover, even though it is possible to add a luxurious design, it requires heating to 150 to 160°C, and conventional synthetic resin eyeglass frames have poor heat resistance. Instead of spraying, which was not used for patterning, it is now possible to use the baking coating method or the transfer printing method that creates tortoiseshell-like patterns, and it is transparent, luxurious, lightweight, and strong. It has been discovered that it is possible to provide a slender synthetic resin eyeglass frame. However, when such a highly heat-resistant resin is used, there is almost no elongation when heated, so it is difficult to heat and soften the lens holding frame and insert the lens into the lens holding frame. (for lenses)
If the holding frame is thin, the holding frame may be damaged at the corners, and the joint part where the resin injected into the mold meets in the mold during injection is particularly insufficient in strength. If so, the holding frame would be easily damaged and could not be put to practical use as an eyeglass frame. As a result of further intensive research, we created a structure in which the lens holding frame was made into an open ring shape, a pair of upper and lower blow tips were integrally injection molded with the above resin at the open end of the holding frame, and the thinnest part of the lens holding frame was cut away. The present inventors have discovered that these problems can be solved by setting the area to 1°5 to 8°, and have completed the present invention.

That is, the present invention has a tensile strength of 800 kg/cd or more (however, AS
TM D-638), flexural modulus 25000
kg/cd or more (according to ASTM D-790)
, heat distortion temperature 190℃ or higher (ASTMD-648,
18.6 kg/al load) made of a transparent thermoplastic resin injection molded body, and an open ring-shaped lens holding frame;
Abstract: An eyeglass frame component comprising a pair of upper and lower blow tips integrally molded on the open end of the lens holding frame, and characterized in that the cross-sectional area of the narrowest part of the lens holding frame is 1.5 to 8. That is.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 shows an embodiment of the lens frame component 1 of the present invention, where 2 is an open ring-shaped lens holding frame, and at the open end of the holding frame 2, a pair of upper and lower blow tips 3a and 3b are connected to the holding frame 2. It is formed in one piece. The blow tips 3a, 3b are for closing the open lens holding frame, and by screwing the screw 4 into the screw hole provided through the upper and lower blow tips 3a, 3b, the upper and lower blow tips 3a, 3b are brought into close contact with each other, thereby closing the lens holding frame 2 and tightening the periphery of the lens to prevent the lens from coming off from the holding frame 2.

The screw holes of the blow tips 3a and 3b are made by making holes that penetrate through the blow tips 3a and 3b, and the blow tips 3b have a metal tube member for passing the screw 4 through, and the blow tip 3a has a metal pipe member for receiving the screw 4. The female threaded tube member can be formed by insert molding the entire insert or by insert molding these tube members at the same time. Alternatively, make a through hole that is slightly thinner than the screw diameter,
The lens holding frame 2 may be configured to be closed using a tapping screw.

The lens holding frame 2 has a lens holding groove 5 as shown in FIG.
is provided, and the holding frame 2 has a width l in the depth direction of 2 to 4 mm.
, thickness t is 0.8 to 3 mm, depth t of lens holding groove 5
2 is about 0.5 fin. The cross-sectional area of the lens holding frame 2 does not need to be the same over the entire circumference of the holding frame, and is usually thinner at the bottom and thicker toward the top (although it may be fine, the cross-sectional area at the thinnest part is 1.5 to 8- If the cross-sectional area of the thinnest part is less than 1.5-1, the holding frame 2 will be made thinner than necessary. ), this is undesirable as it reduces the strength of the holding frame 2. Also, if the cross-sectional area exceeds 8 -, the lens holding frame 2 will become too hard, which will cause problems when attaching the lens. The cross-sectional shape of the lens holding frame 2 is not limited to the shape shown in FIG.
It can also be in the shape of a mouth, Δ, mouth, 0, or the like.

The eyeglass frame part 1 of the present invention has a tensile strength of 800 kg/c+J
or more (according to ASTM D-638), flexural modulus of 25,000 kg/cff1 or more (however, AS'rM
D-790), heat distortion temperature of 190℃ or higher (However, A
STM D-648, 18.6 kg/ad load) is formed from an injection molded transparent thermoplastic resin body. As the resin having the above-mentioned physical properties, polyether sulfone, polyetherimide, and polyallylsulfone are preferable, and they have excellent tensile strength, bending strength, heat resistance, and transparency. These resins can be used alone or in a mixture of two or more.

The eyeglass frame component 1 shown in FIG.
Although not particularly shown, a pair of left and right eyeglass frame parts 1 are provided.
Align them, attach them across, and attach hinge pieces to both ends of the crossover to complete the front frame.

The eyeglass frame parts l of the present invention may be independent on the left and right sides as shown in FIG. good.

The blow handle may be integrally provided with a hinge piece for attaching a temple, an armor piece with a hinge piece, an armor piece for attaching a hinge piece, a member for attaching decorative parts such as a cocoon, etc. As shown in FIG. 4, it is also possible to configure the main blow tooth 3a to also serve as a variable tooth, and the lower blow tooth 3b to be fitted into and hidden in the recess of the upper blow tooth 3a. Further, a hinge piece 8 is integrally provided on the upper blow end 3a, and the hinge piece 10 of the temple 9 is inserted into the groove of the hinge piece 8 and screwed with a screw 11, thereby attaching the temple 9. Can be done. Furthermore, as shown in FIG. 5, a hinge piece 12a is integrally provided on the upper blow tooth 3a, a hinge piece 12b is also integrally provided on the lower blow tooth 3b, and the upper blow tooth 3a and the lower blow tooth 3b are brought into contact. The lens holding frame 2 is configured to be closed by a structure generally called a "split joint" which is fixed with a screw 4, and the hinge of the temple 9 is inserted into the gap between the hinge piece 12a and the hinge piece 12b. Insert piece 10 and screw 11
It may be configured such that the temple 9 is pivotally mounted by screwing the temple 9 into the temple 9.

〔Effect of the invention〕

As explained above, the eyeglass frame parts of the present invention can be made as slender as metal eyeglass frame parts, and are strong even though they are slender, so that the lenses do not come off while being worn or the lens holding frame is damaged. It is possible to provide an eyeglass frame that is free from the above disadvantages and has a lightness comparable to or more than that of conventional synthetic resin eyeglass frames. In addition, since the eyeglass frame parts of the present invention have excellent heat resistance, it is possible to use a painting method such as spraying or baking, or a transfer printing method that gives a tortoiseshell-like pattern to create a high-quality eyeglass frame. In addition, the eyeglass frame parts of the present invention have high transparency, so when a tortoiseshell-like pattern is formed, for example, it will look natural like a real tortoiseshell. A pattern can be obtained. Furthermore, since the eyeglass frame component of the present invention can be mass-produced by injection molding, it has various effects such as being provided at low cost.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, FIG. 1 is a perspective view of one embodiment of the eyeglass frame component of the present invention, and FIG.
FIG. 3 is a perspective view showing different aspects of the eyeglass frame component, and FIGS. 4 and 5 are exploded perspective views of essential parts showing different aspects of the blow tip portion, respectively. 1... Glasses frame parts 2... Lens holding frames 3a, 3
b... Blow Ji Figure 3 Figure 4 Figure 5

Claims (2)

[Claims] (1) Tensile strength of 800 kg/cm^2 or more (however, AST
(according to MD-638), flexural modulus 25000 kg/c
m^2 or more (according to ASTM D-790), heat distortion temperature 190℃ or more (according to ASTM D-648, 18
．． 6 kg/cm^2 load) made of an injection molded body of transparent thermoplastic resin, and an open ring-shaped lens holding frame;
An eyeglass frame component comprising a pair of upper and lower blow tips integrally molded on the open end of the lens holding frame, and having a cross-sectional area of 1.5 to 8 mm^2 at the narrowest part of the lens holding frame. (2) The eyeglass frame component according to claim 1, wherein the thermoplastic resin is one or a mixture of two or more selected from the group consisting of polyethersulfone, polyetherimide, and polyallylsulfone.