1. Fields of the Invention
The present invention relates to a protective lens, especially to a protective lens used for eyeglasses that people with presbyopia can wear during their work.
2. Descriptions of Related Art
People have presbyopia due to aging of eyes. Thus they need to wear a corrective eyewear and a protective eyewear at the same time while working. As shown in
Refer to
Refer to U.S. Pat. No. 1,865,714, a hole is pierced in a large blank. Then a corrective lens is mounted into the hole in the blank by fusing flux. However, the processing and molding processes are complicated. The adhesion precision increases difficulty in the processing and the yield rate is reduced. There is a difference in the image due to the fusing flux. Moreover, the connection between the corrective lens and the hole is easy to be affected by thermal expansion and contraction.
Refer to U.S. Pat. No. 1,835,483, a large countersink is formed in the convex side of a blank. Then a button or disk, having a higher refractive index than the blank is fused in the countersink. Yet the melting of the corrective lens results in complicated processing procedures. The precision of the melting makes the processing and the connection more difficult. The yield rate is low. There is a difference in the image at the connection area due to different refractive index. The connection between the disk and the blank is affected by thermal expansion and contraction.
Refer to U.S. Pat. No. 6,196,678, the corrective lens and the shield of the protective glasses are not on the same plane. The corrective lenses are incorporated in the lower portion of the shield. The corrective lenses are projecting from the shield. Thus users will see an overlapped image or a difference in the image while wearing the protective glasses and this affects user's operation.
Refer to U.S. Pat. No. 6,170,952, the reading lenses are secured to the surface of a plano lens by an adhesive. The light passes the plano lens first and then the reading lenses to form an image on user's eyes. Yet different medium have different refractive index. The adhesive used affects the entrance direction of the light and causes the problem, even the reading lenses and the plano lens made from the same material. In order to overcome the above shortcomings, there is a need to provide a novel protective eyewear.
Therefore it is a primary object of the present invention to provide a protective lens for vision correction that not only protects users' eyes but also has the function of vision correction. For users need vision correction, they feel more comfortable and convenient while wearing a pair of goggles with the protective lenses of the present invention. Moreover, the cost they spent on eyeglasses and the goggles can be reduced.
In order to achieve above object, a protective lens for vision correction according to the present invention is provided.
The protection lens includes a plano lens area and a presbyopic lens area. Both the plano lens area and the presbyopic lens area are produced by injection molding which is performed by an injection molding machine with a single material outlet. The presbyopic lens area is formed in and connected to the plano lens area. There is no overlap between the plano lens area and the presbyopic lens area. The plano lens area and the presbyopic lens area are connected directly without any medium therebetween. After being cut and disposed into an eyeglass frame, the presbyopic lens area is just located at the position corresponding to eyes on user's face.
The presbyopic lens area is a circular area with a diameter of 3-5 centimeter.
The present invention has following advantages:
1. The protective lens includes a plano lens area and a presbyopic lens area. The presbyopic lens area is just corresponding to eyes on user's face after being cut and mounted into an eyeglass frame. Thus the protective lens not only allows people with presbyopia see close objects more clearly but also protects people's eyes during their work.
2. Both the plano lens area and the presbyopic lens area of the protective lens according to the present invention are formed by an injection molding machine with a single material outlet that performs a single time injection. Thus there is no overlap and no medium between the plano lens area and the presbyopic lens area. The light transmittance will not be affected by the medium.
3. Both the plano lens area and the presbyopic lens area of the protective lens according to the present invention are formed by a single time of injection molding. The injection molding is performed by an injection molding machine with a single material outlet. There is no medium therebetween. Thus the connection between the plano lens area and the presbyopic lens area are secured to each other firmly, without being affected by thermal expansion and contraction.
4. Furthermore, the protective lens of the present invention also provides the vision correction for presbyopia. Thus there is no need for users to wear a corrective eyewear while wearing a protective eyewear. The burden on the cost of the eyewear can be reduced.
The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein
Refer to
The protective lens 6 is cut according to the shape of an eyeglass frame 7 and then is assembled with the eyeglass frame 7, as shown in
In a preferred embodiment of the present invention, the presbyopic lens area 62 is a circular area with a diameter of 3-5 centimeter. When people with presbyopia wear the eyeglasses with the protective lens 6, the presbyopic lens area 62 is just located at the position corresponding to eyes on user's face. Thus the presbyopic lens area 62 covers people's eyes while they are working and the line of sight moves. Therefore people with presbyopia can see close objects clearly, without affecting their operation.
Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details, and representative devices shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.
Number | Date | Country | Kind |
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101209554 | May 2012 | TW | national |
This application is a continuation-in-part of U.S. patent application Ser. No. 13/866,230, filed on Apr. 19, 2013, currently pending, which claims the benefits of the Taiwan Patent Application Serial Number 101209554, filed on May 21, 2012, the subject matter of which is incorporated herein by reference.
Number | Date | Country | |
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Parent | 13866230 | Apr 2013 | US |
Child | 14707291 | US |