| 摘要 |
PURPOSE: To deal with the small quantity production of multiform lenses, to say nothing of the mass production of a lens, by composing the portion, of the recessed part of the surface of a lens abrasion working jig, of synthetic resin. CONSTITUTION: A thermoplastic resin composition is composed of a titanic acid potassium whiskers of 30wt.% having a thermoplastic resin of 50%, a mean fiber diameter of 5m or less, an aspect ratio of 3 or more, and a Moh's hardness of 6 or less; and of a talc of 20wt.% having a mean grain diameter of 20μm or less, and a Moh's hardness of 6 or less. Also, the composition has a bending strength of 1000kgf/cm<2> or more, a bending elastic modulus of 70000 kgf/cm<2> , and a thermal deformation temperature of 180 deg.C or more; and is adaptable to be cutting-worked. In a jig 1, three recessed parts 12, for fixing a lens to be abraded, are directly formed on the surface of the synthetic-resin-made jig main body 11. The surface of the jig main body 11 is formed into a protruded spherical surface, and respective recessed parts 12 are provided with a lens seated surface 121, for seating a lens L to be abraded and having a recessed spherical surface, and a recessed part 122 in the middle part.
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