DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG.
3 of the drawings, a seam structure 30 of connecting two edge joints of two rubber sheets, according to a preferred embodiment of the present invention, is illustrated.
Each of the two rubber sheets 21, 22 comprises a sheet body 211, 221 having a predetermined thickness made of rubber, and two fabric layers 212, 222, made of nylon jersey knit or cotton, are respectively coated on two sides of the sheet body 211, 221.
In order to connect two rubber sheets 21, 22 to form an integrated rubber sheet having larger surface area and same even thickness, or connect pieces of rubber sheet made component to construct a sportswear, the first rubber sheet 21 provides at least a base edge joint 31 having a L-shaped cross section and the second rubber sheet 22 forms at least a covering edge joint 32 having a L-shaped cross section adapted to connect with the base edge joint 31 to construct the seam structure of the present invention.
The seam structure 30 forms a tight seal joint that integrally connects the covering edge joint 32 with the base edge joint 31 of the two rubber sheets 21, 22.
Since normally the two rubber sheets 21, 22 have the same predetermined thickness, the seam structure 30 is preferred to have a thickness equal to the thickness of the rubber sheet 21, 22, that is why the conventional seam structure as shown in FIG.
2 does not simply overlap the two edges portions of the two rubber sheets which doubles the thickness.
According to the preferred embodiment of the present invention, as shown in FIGS.
3 and 4, the base edge joint 31 of the first rubber sheet 21 has a root portion 31a and an end portion 31b defining a base connection surface 311 extended sidewardly from the root portion 31a to the end portion 31b.
The thickness of the root portion 31a equals to the thickness of the first rubber sheet 21 and the end portion 31b is reduced to a predetermined thickness, preferably half of the thickness of the first rubber sheet 21
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Optical Systems 
