WO2014024223A1

WO2014024223A1 - Highly elastic front frame for eyewear

Info

Publication number: WO2014024223A1
Application number: PCT/JP2012/005077
Authority: WO
Inventors: 増永　悟
Original assignee: 増永眼鏡株式会社
Priority date: 2012-08-09
Filing date: 2012-08-09
Publication date: 2014-02-13

Abstract

[Problem] To provide a highly elastic front frame for eyewear which, without sacrificing the fit and durability of a plastic frame using highly elastic resin, is able to keep the lenses from falling out and outer appearance from deteriorating when the temples are being opened, and also allows a high degree of design flexibility. [Solution] A highly elastic front frame for eyewear includes: a full-rim or half-rim front frame (1) formed from a highly elastic resin material having a flexural modulus of 4000 MPa or less and a flexural strength of 70 MPa or more; and reinforcing core members (2) which have a larger flexural stiffness than the rims (11, 11) of the front frame (1) and are partially inserted into the right and left rims (11, 11) immediately above the lens (L, L). When the right and left temples (T, T) connected to both sides of the front frame (1) are opened, the bridge (12) and the end pieces (13, 13) of the front frame (1) bend while the inserted reinforcing core members (2, 2) keep the rims (11, 11) from elastically deforming.

Description

High elastic front frame of glasses

The present invention can improve the front frame of the eyeglasses, and in particular, can prevent the lens from falling off and the appearance from deteriorating when the temple is expanded without impairing the fit and durability of the highly elastic resin. The present invention relates to a highly elastic front frame of glasses that is not restricted unnecessarily.

As is well known, the plastic frame of glasses generally used a cellulosic resin (celluloid or acetylcellulose), but recently, a plastic with more elastic properties (for example, polyamide resin (PA) or Polyphenylsulfone resin (PPSU), polyetherimide resin (PEI), etc.) are also increasing.

The reason is that by using a highly elastic resin for the plastic frame, it is possible to obtain excellent durability (hardness to break) with respect to a supple fit feeling and impact at the time of mounting. However, when the front frame is made of a highly elastic resin, various problems arise due to the entire front frame being greatly bent when the temple is expanded.

For example, in a full rim or half rim front frame, when the temple is greatly expanded on both sides, not only the bridge at the center and the wisdom at both ends, but also the rim that holds the lens, a large load is applied in the bending direction. If the rim is elastically deformed beyond the range that can be followed, the lens may come off the rim and fall off.

Also, in the brow-bar type front frame, if the temples are spread on both sides, the brow bar will bend forward and will be lifted up, so the appearance will be very bad. Incidentally, the method of suppressing deformation by bonding a blow bar to a lens not only requires an advanced bonding technique, but also cannot be used because the adhesive is likely to peel off due to aging.

On the other hand, conventionally, a technique for increasing strength by embedding a metal core in a plastic frame is also known (see, for example, Patent Documents 1 to 3). The purpose of this is to reinforce the frame by putting a highly rigid material inside so that the thin (or thinned) plastic frame is not easily bent or bent by an impact or the like.

However, since the above prior art is only intended to reinforce the cellulosic resin frame, no consideration is given to the bending of the highly elastic resin. In other words, in the above prior art, since the reinforcing core material is also inserted into the bridge and the wisdom of the front frame, the bending is suppressed to the portion where the elastic characteristics should be exhibited.

In addition, as a means of suppressing the elastic deformation of the rim and blow bar of the front frame, a method of simply increasing the rigidity by forming the rim and blow bar thickly is conceivable. Diversification becomes difficult. In addition, a slender frame design with a smart impression cannot be adopted.

Japanese Utility Model Publication No. 2-24817 JP 2000-292606 A JP 2004-53877 A

Therefore, the present invention has been made in view of the problems as described above, and the object of the present invention is to reduce the fit and durability of a plastic frame using a highly elastic resin without expanding the temple. An object of the present invention is to provide a highly elastic front frame for spectacles that can prevent the lens from dropping off and the appearance from being deteriorated and that has a high degree of design freedom.

<Means adopted by the present inventor for solving the above-mentioned problems will be described with reference to the accompanying drawings.

That is, the present invention includes a full rim type or half rim type front frame 1 made of a highly elastic resin material having a bending elastic modulus of 4000 MPa or less and a bending strength of 70 MPa or more; and a bending rigidity larger than the

rims

11 and 11 of the front frame 1; In addition, a highly elastic front frame of the spectacles is constructed from the reinforcing core material 2 partially inserted directly above the lenses L and L of the left and

right rims

11 and 11,
When the left and right temples T and T connected to both sides of the front frame 1 are expanded, the bridge 12 and the

wisdom

13 and 13 of the front frame 1 bend while the

rims

11 and 11 are inserted by the inserted reinforcing

cores

2 and 2. It is characterized in that it is possible to suppress elastic deformation.

The reinforcing core material 2 is made of a metal having a higher bending elastic modulus than the high elastic resin of the front frame 1 in order to sufficiently suppress the elastic deformation of the

rims

11 and 11 when the temples T and T are expanded. It is desirable to use a material or a highly rigid plastic material having a flexural modulus of 1 GPa or more.

Further, examples of the highly elastic resin used for the front frame 1 include polyamide resins, polyphenylsulfone resins, polyetherimide resins, etc., which have a bending elastic modulus comparable to that of the cellulose resin and a very high bending strength. Are preferably used.

On the other hand, the reinforcing core member 2 is not only used as a core member for increasing the rigidity, but also the fitting portion F for fitting the convex portion or groove portion on the outer periphery of the lens L inside the rim 11 of the front frame 1 or one of the fitting portions F. It can also be used as a part.

Further, when the metal plate material used as the reinforcing member 2 is inserted into the groove portion of the rim 11, the reinforcing member 2 is press-fitted into the groove of the rim 11 by providing a notch 21 on one of the long sides of the metal plate material. At this time, it is possible to fix the reinforcing member 2 so as not to be detached from the rim 11 by allowing the highly elastic resin of the rim 11 to enter the notch 21.

Further, the front frame 1 may be of a blow bar type, in which case the reinforcing core material 2 having higher bending rigidity than the

blow bars

14 and 14 of the front frame 1 is used as the lens of the left and

right blow bars

14 and 14. The elastic deformation of the

blow bars

14 and 14 can be suppressed by being partially inserted directly above the L and L, and the inserted reinforcing core 2.

In the present invention, in the front frame using a highly elastic resin, the reinforcing core material is partially inserted in the upper part of the rim, so that the temple is more rigid (bent than the rim) when the temple is greatly expanded when wearing glasses. Since the elastic deformation of the rim can be suppressed by the reinforcing core material having a large elastic modulus), it is possible to solve the problem in use in which the lens falls off the rim.

On the other hand, since the reinforcing core material is not inserted into the bridge or wi of the front frame, the elastic deformation of the bridge or wiping when the temple is expanded is not hindered by the reinforcing core material. Therefore, the function of the highly elastic resin frame that improves the fit and durability by bending can be sufficiently exhibited.

Also for brow bar-type front frames that do not hold the lens directly, it is possible to suppress elastic deformation when the temples are expanded by partially inserting the reinforcing core material into the brow bar. In this case, it is possible to eliminate the appearance problem that the brow bar warps forward or rises upward.

In addition, by adopting the method to increase the rigidity by inserting the reinforcing core material into the rim and blow bar of the front frame as described above, it is not necessary to form the rim and blow bar thick (or thick), so the design of the front frame Is not clunky or unnecessarily limited in design freedom.

Therefore, according to the present invention, it is possible to provide a high-elasticity front frame for spectacles that can eliminate inconveniences during use and design without impairing the function of the plastic frame made of high-elasticity resin. It ’s expensive.

It is the whole top view and whole front view showing the spectacles provided with the highly elastic front frame in Example 1 of this invention. FIG. 3 is an X-X ′ sectional view and a Y-Y ′ sectional view showing a sectional structure of a highly elastic front frame in Embodiment 1 of the present invention. It is explanatory drawing in order to demonstrate the manufacturing method of the highly elastic front frame in Example 1 of this invention. FIG. 6 is an overall front view, a cross-sectional view taken along line A-A ′, and a cross-sectional view taken along line B-B ′ showing a blow bar type high-elasticity front frame in Embodiment 2 of the present invention. It is sectional drawing showing the lens mounting structure of the highly elastic front frame in the modification of this invention.

“Example 1”
A first embodiment of the present invention will be described with reference to FIGS. In the figure, what is indicated by reference numeral 1 is a plastic front frame, and what is indicated by reference numeral 2 is a reinforcing core. Also, what is indicated by a symbol L is a lens, and what is indicated by a symbol T is a temple.

First, in the first embodiment, a full rim type front frame 1 having left and

right rims

11 and 11 for holding lenses L and L, a bridge 12 for connecting these, and a

wisdom

13 and 13 for hinge-connecting temples T and T is provided. It is made of a highly elastic resin (see FIG. 1). In this embodiment, a polyamide resin having a flexural modulus of 1700 MPa and a flexural strength of 135 MPa is used as the highly elastic resin.

In the front frame 1, a reinforcing core 2 is partially inserted directly above the lenses L and L of the left and right rims 11 and 11 (see FIG. 2). In this embodiment, a metal plate material having a bending elastic modulus larger than that of the highly elastic resin is used for the reinforcing core material 2, and the metal plate material is embedded inside the

rims

11 and 11 as shown in FIG. Both are integrated in the state.

Incidentally, with respect to the method of inserting the reinforcing core material 2 into the rim 11, as shown in FIG. 3, the front frame 1 is formed in a shape in which a groove is formed on the inner peripheral surface of the rim 11, and this rim is formed. A method of inserting and fixing the reinforcing core material 2 into the 11 groove portions, or a method of forming the reinforcing core material 2 in an embedded state by insert molding at the time of manufacturing the front frame 1 can be employed.

Further, when the reinforcing member 2 is inserted into the groove portion of the rim 11 after being molded, the reinforcing member 2 is provided with a notch portion 21 into which the highly elastic resin of the rim 11 enters when the reinforcing member 2 is press-fitted into the groove of the rim 11. It is desirable that the reinforcing member 2 can be firmly fixed to the rim 11 by being provided on one of the longitudinal sides of a certain metal plate.

Further, by configuring the front frame 1 as described above, when the left and right temples T and T are greatly expanded, it is possible to suppress the elastic deformation of the

rims

11 and 11 by the rigid reinforcing

core materials

2 and 2. Become. On the other hand, since the bridge 12 and the

wisdoms

13 and 13 of the front frame 1 are greatly bent when the temple is expanded, it is possible to improve the fit at the time of wearing.

Furthermore, in the present embodiment, the fitting portion F is formed on the inner surface of the rim 11 by fixing the metal plate material that is the reinforcing core member 2 with the lower half protruding, so that the fitting portion F is formed. If the groove portion of the lens L is fitted to the portion F (the protruding portion of the metal plate material), the lens L can be fixed to the rim 11 using the reinforcing member 2.

“Example 2”
Next, Example 2 of the present invention will be described below with reference to FIG. In the second embodiment, the front frame 1 has a structure including brow bars 14 and 14 whose ends are connected to the bridge 12 and the

ends

13 and 13 without directly holding the lenses L and L, respectively. The lenses L and L are fixed to a fastening portion provided on the bridge 12 with a pin.

In the blow bars 14 and 14 of the front frame 1, a reinforcing core material 2 having a bending rigidity larger than that of the blow bar 14 is partially inserted directly above the lenses L and L. Thereby, like the rim of the first embodiment, it is possible to suppress the elastic deformation of the blow bars 14 and 14 when the temples are expanded by the inserted reinforcing core member 2.

Further, as shown in the AA ′ and BB ′ sectional views of FIG. 4, in this embodiment, no protruding portion is formed on the lower surface of the brow bars 14 and 14 and the outer periphery of the lens L is not formed. No groove is formed on the surface. Therefore, the blow bars 14 and 14 of the front frame 1 are not fixed to the lenses L and L and are in a free state.

The present invention is generally configured as described above. However, the present invention is not limited to the illustrated embodiment, and various modifications can be made within the description of “Claims”. As the highly elastic resin, any synthetic resin material having a bending property with a bending elastic modulus of 4000 MPa or less and a bending strength of 70 MPa or more can be adopted.

Specific examples of high-elasticity resins include polyamide-based resins (bending elastic modulus: about 1500-1700 MPa, bending strength: about 85-135 MPa) that have a high bending strength while having a bending elastic modulus similar to that of cellulosic resins. And polyphenylsulfone resin (flexural modulus: about 2400 MPa, flexural strength: about 90 MPa), polyetherimide resin (flexural modulus: about 3300 MPa, flexural strength: about 150 MPa), and the like.

Incidentally, the general bending properties of cellulose acetate are bending elastic modulus: about 800-2100 MPa, bending strength: about 30-50 MPa. Further, as the front frame 1 made of high elasticity resin, not only a full rim type and a blow bar type but also a half rim type (ny roll type) can be adopted.

On the other hand, as for the material of the reinforcing core material 2, a material other than metal can be selected as long as the material has sufficient rigidity to suppress elastic deformation of the

rims

11 and 11 when the temples T and T are expanded. In the case of a plastic material, it is preferable to use a high-rigidity plastic having a flexural modulus of 1 GPa or more.

Further, the fitting portion F formed on the inner side of the rim 11 of the front frame 1 can be formed into a groove shape. In this case, as shown in FIGS. 5 (a) and 5 (b), the reinforcing member 2 is provided. It is possible to embed by shifting back and forth or embed in the groove. Further, the reinforcing core member 2 can be completely embedded without being exposed on the surface of the rim 11, and any of them belongs to the technical scope of the present invention.

In recent years, the plastic frame of glasses has been required not only to be fashionable but also to be comfortable when worn, including a fit. Under such circumstances, the highly elastic front frame according to the present invention is a useful technology that can maximize the functions of the highly elastic resin without causing problems in use or appearance, and therefore has an industrial utility value. Is very expensive.

1 Front frame 11 Rim 12 Bridge 13 wi 14 Brow bar 2 Reinforcement core 21 Notch L Lens T Temple F Fitting

Claims

Full rim type or half rim type front frame (1) made of high elastic resin with a flexural modulus of 4000MPa or less and a bending strength of 70MPa; and the bending rigidity is larger than the rims (11) and (11) of this front frame (1) And a reinforcing core material (2) partially inserted directly above the lenses (L) and (L) of the left and right rims (11) and (11),
When the left and right temples (T) (T) connected to both sides of the front frame (1) are expanded, the bridge (12) and wi (13) (13) of the front frame (1) bend, A highly elastic front frame for spectacles, characterized in that elastic deformation of the rims (11) and (11) is suppressed by the reinforcing core members (2) and (2).
2. A highly elastic front frame for spectacles according to claim 1, wherein the reinforcing core (2) is made of a metal material or a high-rigidity plastic material having a flexural modulus of 1 GPa or more.
3. The highly elastic front frame of glasses according to claim 1, wherein polyamide resin, polyphenylsulfone resin, or polyetherimide resin is used as the highly elastic resin material of the front frame (1). .
The reinforcing core material (2) is formed with a fitting portion (F) for fitting with a convex portion or groove portion on the outer periphery of the lens (L) inside the rim (11) of the front frame (1). The high-elasticity front frame for eyeglasses according to any one of claims 1 to 3.
When a metal plate is used for the reinforcing member (2) and the reinforcing member (2) is press-fitted into one of the long sides of the metal plate into the groove inside the rim (11), the highly elastic resin of the rim (11) is used. The high-elasticity front frame for eyeglasses according to any one of claims 1 to 4, further comprising a notch (21) for allowing the eyeglass to enter.
Blow bar type front frame (1) made of highly elastic resin with a flexural modulus of 4000 MPa or less and a bending strength of 70 MPa or more; Bending rigidity greater than the blow bars (14) and (14) of this front frame (1), and left and right blow bars (14) A reinforcing core material (2) partially inserted directly above the lens (L) (L) of (14),
When the left and right temples (T) (T) connected to both sides of the front frame (1) are expanded, the bridge (12) and wi (13) (13) of the front frame (1) bend, A highly elastic front frame for spectacles, characterized in that elastic deformation of the blow bar (14) (14) is suppressed by the reinforcing core member (2).