Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – With antiglare or shading
Reexamination Certificate
1999-12-10
2001-05-15
Dang, Hung Xuan (Department: 2873)
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
With antiglare or shading
C351S057000
Reexamination Certificate
active
06231179
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method and a device for coupling spectacles and clip-on sun-shades with each other, and more particularly, the present invention relates to a method and a device for coupling spectacles and clip-on sun-shades with each other, which enable sunglasses referred to as “clip-on sun-shades” not having arms to be detachably coupled to spectacles.
2. Description of the Related Art
Generally, spectacles are used for the purpose of enhancing eyesight of a person who has defective vision. Sunglasses help to protect the eyes from strong light which may cause damage to the eyes. Ordinary spectacles comprise lens frames connected together at their inner ends by a nose frame, lenses fitted into respective lens frames, and arms mounted to outer ends of the lens frames through hinges.
Eyesight is divided into normal eyesight, nearsightedness, farsightedness and astigmatism. If incoming parallel lights are imaged such that an image is focused in front of the retina, nearsightedness (myopia) exists, whereby an observer can properly view close objects, but poorly view distant objects. By utilizing concave lenses as lenses of spectacles, nearsightedness can be adequately corrected. If incoming parallel lights are imaged such that an image is focused behind the retina, farsightedness (hyperopia) exists, whereby an observer can poorly view close objects, but properly view distant objects. In the case of astigmatism, due to the fact that a spherical surface of the eyeball, especially the cornea, is not even, incoming parallel lights cannot be focused directly to a point on the retina, whereby an observer cannot properly focus his eyesight.
While, as described above, spectacles are used for enhancing eyesight of a person who has defective vision, in a hot summer weather when ultraviolet rays dominate, a spectacle wearer must prepare separate sunglasses.
In other words, unlike non-prescription sunglasses which are worn by persons who do not have vision defects, in the case of persons who wear spectacles due to an ocular refractive error, separate sunglasses having vision-corrective lenses of a power which corresponds to that of the user's normal spectacle lenses, must be used, whereby cost is increased.
To cope with this problem, clip-on sun-shades which do not have arms and to which tinted lenses are mounted, are attached in front of the spectacles, thereby to render the same vision enhancing effect as can be achieved by wearing the conventional vision-corrective sunglasses having arms.
Referring to
FIG. 9
, there is shown a cross-sectional view illustrating a state wherein spectacles and clip-on sun-shades according to the conventional art are coupled with each other. The spectacles
10
has first lens frames
2
which are connected together at their inner ends by a first nose frame
3
, lenses
1
which are fitted into respective first lens frames
2
, and arms
4
which are mounted to outer ends of the first lens frames
2
through hinges
5
. The clip-on sun-shades
20
have second lens frames
22
which are connected together at their inner ends by a second nose frame
23
, and tinted lenses
21
which are fitted into respective second lens frames
22
.
In order to couple the spectacles
10
and the clip-on sun-shades
20
with each other, the first nose frame
3
of the spectacles
10
and the second nose frame
23
of the clip-on sun-shades
20
are formed with accommodating grooves
25
and
26
, respectively, and permanent magnets
27
and
28
are inserted into the accommodating grooves
25
and
26
, respectively, whereby the clip-on sun-shades
20
are stably coupled to the spectacles
10
by virtue of magnetic force of the permanent magnets
27
and
28
.
However, the above-described coupling structure between the spectacles
10
and the clip-on sun-shades
20
suffers from defects in that, since the accommodating grooves
25
and
26
for receiving the permanent magnets
27
and
28
must be defined in the spectacles
10
and the clip-on sun-shades
20
, respectively, sizes of the first and second nose frames
3
and
23
are enlarged, and limitations are imposed on design freedoms for the spectacles
10
and the clip-on sun-shades
20
. Moreover, due to weight of the first and second nose frames
3
and
23
and the permanent magnets
27
and
28
which have enlarged sizes, the entire weight of the combination including the spectacles
10
and the clip-on sun-shades
20
is increased, and wearing comfortableness is deteriorated.
In addition, due to the fact that the permanent magnets
27
and
28
should be mounted to the first and second nose frames
3
and
23
of the spectacles
10
and the clip-on sun-shades
20
, respectively, assembling operations must be carefully performed while paying attention to directional characteristics of the permanent magnets
27
and
28
depending upon magnetic poles, whereby assemblability is degraded and productivity is diminished. In the worst case, if the permanent magnets
27
and
28
are misassembled, it is impossible to couple the clip-on sun-shades
20
to the spectacles
10
.
In particular, as shown in
FIG. 10
which is a view illustrating magnetic flux distribution between the spectacles
10
and the clip-on sun-shades
20
, in the case that the spectacles
10
and the clip-on sun-shades
20
are coupled with each other using the pair of permanent magnets
27
and
28
, the North and South poles N and S of the permanent magnets
27
and
28
, which adjoin to each other, are properly coupled with each other by attractive force generated therebetween. However, because magnetic force which is generated in the North and South poles N and S of the permanent magnets
27
and
28
, which are opposed to each other is maintained in an opened status, the magnetic force is dissipated and lost to the outside, whereby coupling force between the spectacles
10
and the clip-on sun-shades
20
is remarkably reduced.
SUMMARY OF THE INVENTION
Accordingly, the present invention has been made in an effort to solve the problems occurring in the related art, and an object of the present invention is to provide a method and a device for coupling spectacles and clip-on sun-shades with each other, which enable the spectacles and clip-on sun-shades to be easily coupled with each other, manufacturing and assembling procedures of coupling means to be simplified, costs of the spectacles and clip-on sun-shades to be reduced, and design freedoms for the spectacles and clip-on sun-shades to be improved, thereby enhancing productivity and quality of the spectacles and clip-on sun-shades, preventing the clip-on sun-shades coupled to the spectacles from being undesirably uncoupled from the spectacles and improving user convenience.
In order to achieve the above object, according to one aspect of the present invention, there is provided a device for coupling spectacles and clip-on sun-shades with each other, the spectacles having first lens frames connected together at their inner ends by a first nose frame, lenses fitted into respective first lens frames and arms mounted to outer ends of the first lens frames through hinges, the clip-on sun-shades having second lens frames connected together at their inner ends by a second nose frame and tinted lenses fitted into respective second lens frames, the device comprising: a permanent magnet disposed to either one of the spectacles or the clip-on sun-shades at a predetermined position; and a soft magnetic member disposed to the other of the spectacles or the clip-on sun-shades at a preset position in a manner such that the soft magnetic member can be mated with the permanent magnet thereby to couple the spectacles and the clip-on sun-shades with each other.
REFERENCES:
patent: 5936700 (1999-08-01), Masunaga
patent: 5975691 (1999-11-01), Ku
patent: 6012811 (2000-01-01), Chao et al.
patent: 6116732 (2000-09-01), Xiao
Dang Hung Xuan
Jacobson Price Holman & Stern PLLC
Lee Suk Jae
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