JPH06294946A - Member of spectacles - Google Patents

Abstract

PURPOSE:To provide a member of spectacles showing basic characteristics as a shape memory alloy and having excellent durability and applicability. CONSTITUTION:A shape memory alloy tube produced from a Ti-Ni alloy material which shows superelasticity in the use environment at normal temp. is used as rims 10A, 10B of frames of spectacles. The shape memory alloy tube shows small deformation load against bending, so that lenses can be stably attached and detached. Further, the tube has high recovery strength so that enough constraint for lenses is maintained and lenses are stably fixed. Since the shape memory alloy tube has no residual strain against bending, it has good durability against attaching and detaching of lenses.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spectacle member using a shape memory alloy member applicable under normal temperature use environment.

[0002]

2. Description of the Related Art Generally, shape memory alloys such as Ti--N are used.
i-based alloys and Cu-Zn-Al-based alloys)
It is known that a remarkable shape memory effect is exhibited in association with the reverse transformation of the martensitic transformation. Also, the shape memory alloy is
It is also known to exhibit good superelasticity in the reverse transformation matrix state.

For example, a superelastic spring made of shape memory alloy is
Since it is reversible even when the elongation strain is about 7%, it has the advantage that it can be used as a linear spring without forming a coil unlike stainless steel wire or piano wire. Since such a linear spring material has an advantage of being able to prevent deformation and improve shape retention, a catheter guide wire, a brass core bar,
It has been put to practical use as a core metal for corsets.

On the other hand, in recent years, shape memory alloys have been mainly used for eyeglass members which mainly constitute eyeglass frames. Usually, the shape memory alloy member for eyeglass members is one that has a shape memory property that allows deformation when wearing glasses to be returned to the original state by putting it in hot water, etc. There is.

Specifically, a Ti-Ni alloy material is mainly used for the shape memory alloy member of the spectacle member, mainly for temples, bridges, transitions and the like.

[0006]

By the way, in the case of the conventional eyeglass member, a spring material is used for the rim. The spring material used for this rim is the spring material of the frame that fixes the lens, and the diameter φ of the spring material is 0.5.
The use of thin wires on the order of mm has been proposed.

However, while the recoverable elongation of the shape memory alloy shows a limit of about 7%, considering that the rim length is about 50 mm, the maximum movable range of the rim is 3.5 mm. However, if a thin wire of about 0.5 mm is used, it is hardly possible to mount or dismount the lens and it is not practically used.

Therefore, a coil spring made of stainless steel is generally used as a spring material for a general rim. However, in the case of this stainless steel coil spring, it is necessary to suppress the movable range (decrease the elastic modulus) in order to sufficiently fix the lens as the rim, that is, in order to strengthen the restoring force of the spring, and thus the repetition There is a problem that it is difficult to put on and take off.

The present invention has been made to solve the above problems, and a technical object thereof is to provide a spectacle member excellent in durability and applicability by utilizing the basic characteristics of the shape memory alloy. .

[0010]

According to the present invention, there is obtained a rim member for an eyeglass frame including a shape memory alloy tube and an additional member connected to the shape memory alloy tube.

On the other hand, according to the present invention, a rim member for a spectacle frame made of a shape memory alloy tube can be obtained.

Further, according to the present invention, in any one of the above-mentioned rim members for spectacle frames, the shape memory alloy tube is a rim for spectacle frames, which is made of a Ti--Ni alloy material that exhibits superelasticity under normal temperature use environment. The member is obtained.

Further, according to the present invention, there can be obtained an eyeglass frame including two of the eyeglass frame rim members described in any one of the above and a connecting member connecting the rim members.

In addition, according to the present invention, spectacles including the spectacle frame and the lenses held by the spectacle frame can be obtained.

[0015]

Embodiments Hereinafter, the eyeglass member of the present invention will be described in detail with reference to the drawings by referring to embodiments. First, the basic structure of the eyeglass member of the present invention will be briefly described.

This spectacle member is formed by using a shape memory alloy tube manufactured from a Ti-Ni alloy material that exhibits superelasticity at room temperature for use in part or all of the rim of the spectacle frame. is there.

Therefore, the method of manufacturing the shape memory alloy tube used for this rim and its characteristics will be specifically described below.

First, each of the T
i-50 at% Ni alloy material, Ti-50.5 at% N
After obtaining the i alloy material and the Ti-51 at% Ni alloy material,
Each of these alloy materials is machined into a solid billet, and subsequently machined to have an outer diameter φ ₍ out ₎ of 15 mm and an inner diameter φ.
Three types of cylindrical bodies having _(in) of 11 mm were used.

Subsequently, various tubular bodies were subjected to hot working and cold working to obtain three types of tubes having a diameter φ of 0.5 mm and a thickness of 0.05 mm. Furthermore, each of these tubes was heat-treated under a temperature condition of 400 to 500 [° C.] to obtain three types of shape memory alloy tubes.

Next, a three-point bending test in which both ends of each shape memory alloy tube were fixed so that the length dimension was 100 mm and the central portion was pushed in by 10 mm at 10 ° C. and 2
The test was performed on each of the three types of shape memory alloy tubes under the temperature condition of 5 ° C.

Table 1 shows the results of the three-point bending test for these three types of shape memory alloy tubes, which are Ti-50.5.
A wire having a wire diameter φ ′ of 0.5 mm manufactured through a similar process using an at% Ni alloy material, and a wire diameter φ ′ of 0.1
of a three-point bending test for a coil spring having an outer diameter of 0.5 mm using a wire of mm and a coil spring having an outer diameter of 0.5 mm using a wire of pure stainless steel having a wire diameter φ ′ of 0.1 mm. It is shown together with the results.

[0022]

[Table 1]

It can be seen from Table 1 that the shape memory alloy tubes of Sample Nos. 1 to 3 have almost no residual strain when pressed and bent by 10 mm, and have a residual strain of 4 only at 10 ° C. It can be seen that the shape memory alloy tube of No. 0 also becomes zero at 25 ° C. Incidentally, the residual strain at 10 ° C. in the shape memory alloy tube of Sample No. 2 is an apparent strain due to the shape memory effect.

By the way, the bending load (deformation load) at the time of pushing and bending, when using the material as the rim of the spectacle frame, becomes a force necessary for mounting and dismounting the lens on and from the rim, so that it is preferable that the bending load is small. The deformation loads of the shape memory alloy tubes of sample numbers 1 to 3 are all sample number 6
It is almost the same as the stainless steel coil spring of
The shape memory alloy wire of Sample No. 4 is extremely large.

On the other hand, since the recovery load acts as a restraining force on the lens, it is preferable that the recovery load is large. The recovery loads of the shape memory alloy tubes of sample numbers 1 to 3 are almost the same as those of the stainless steel coil spring of sample number 6, but are extremely small in the shape memory alloy coil spring of sample number 5.

FIG. 1 shows the load F (kgf) -deflection τ (mm) at a temperature of 25 ° C. for the shape memory alloy tube of sample No. 1 and the stainless steel coil spring of sample No. 6.
It shows the characteristics. Here, the load-deflection characteristic of the shape memory alloy tube of sample number 1 is shown by a solid line, and the load-deflection characteristic of the stainless steel coil spring of sample number 6 is shown by a dotted line.

Curves C, C in any load-deflection characteristic
Also in ′, the ascending portions C _A and C _A ′ on the large load side show the deformation load, and the portions C _B and C _B ′ that continue from the ascending portion to the small load side through the inflection points K and K ′ represent the recovery load. Show. Further, the value of the flexure at the intersection point C _X ′ from the recovery load portion C _B ′ to the flexure axis indicates the residual strain.

That is, the curve C in the load-deflection characteristic for sample No. 1 is a closed curve, and there is no residual strain.
Also, the curve C'in the load-deflection characteristic for sample No. 6
Is an open curve, and as shown in Table 1, it can be seen that there is about 8 residual strains.

From the above results, it is understood that the shape memory alloy tubes of sample Nos. 1 to 3 in Table 1 are all extremely excellent as rim materials for eyeglass frames. Incidentally, the deformation load and the recovery load can be adjusted by changing the outer diameter, the wall thickness, the heat treatment conditions, etc. of the tube to be manufactured, and can be selected according to the purpose.

FIG. 2 is a perspective view showing the outer appearance of an eyeglass frame including the eyeglass member of the present invention. Here, the spectacle frame is a rim 10 that restrains a pair of lenses.
A, 10B, a temple 11 extending from both ends formed by these rims 10A, 10B, a bridge 12 and a bridging portion 13 installed between the rims 10A, 10B. That is, the bridge 12 and the transition portion 13 are the rim 1
It becomes a coupling member for 0A and 10B.

In the case of this spectacle frame, the rim 10A,
Since the shape memory alloy tube described above is used as the material of 10B, the lens can be sufficiently fixed, and
The lens can be attached and detached with good stability. That is, this rim 1
0A and 10B have excellent durability when the lens is attached and detached. Incidentally, even when the shape memory alloy tube is used for a part of the material of the rim and the additional member is used for the rest, the same effect as when the shape memory alloy tube is used for the entire material of the rim is obtained.

In the embodiment, the case where three kinds of Ti-Ni alloy materials are used as the material of the shape memory alloy tube used as the material of the rim has been described, but in reality, Ti- (48-5
2) Any at% Ni alloy material can be applied. Furthermore, Ti-Ni added with a third element such as Fe, Cr, V
-It can be applied to all shape memory alloy materials such as X alloys (where X is Fe, Cr, V, etc.), copper-based alloys, iron-based alloys, etc., and is also applied when additional members are added. Therefore, the present invention is not limited to the embodiments.

[0033]

As described above, according to the present invention, a shape memory alloy tube manufactured using a Ti-Ni alloy material that exhibits superelasticity at room temperature is used for the rim of an eyeglass frame. Since the deformation load during push-bending is small, the recovery load is large, and the residual strain is zero, stability and durability are guaranteed when the lens is attached and detached, and a sufficient restraining force for the lens is secured. As a result, the fixing of the lens is stabilized. As a result, it is possible to obtain an eyeglass member that maintains the basic properties of the shape memory alloy and is excellent in durability and applicability.

[Brief description of drawings]

FIG. 1 is a load F (k at a temperature of 25 ° C. regarding a shape memory alloy tube which is an example of the eyeglass member of the present invention and a stainless steel coil spring which is an example of a conventional eyeglass member.
gf) -deflection τ (mm) characteristics are shown.

FIG. 2 is a perspective view showing an outer appearance of an eyeglass frame including an eyeglass member of the present invention.

[Explanation of symbols]

 10A, 10B Rim 11 Temple 12 Bridge 13 Crossover

Claims (5)

[Claims] 1. A rim member for a spectacle frame, comprising a shape memory alloy tube and an additional member connected to the shape memory alloy tube. 2. A rim member for a spectacle frame, which is made of a shape memory alloy tube. 3. The spectacle frame rim member according to claim 1 or 2, wherein the shape memory alloy tube is made of a Ti—Ni-based alloy material that exhibits superelasticity under a normal temperature use environment. Frame rim member. 4. A spectacle frame comprising two rim members for a spectacle frame according to any one of claims 1 to 3 and a coupling member coupling between these rim members. 5. An eyeglass comprising the eyeglass frame according to claim 4 and a lens held by the eyeglass frame.