COVER GLASS FOR PEN INPUT DEVICE AND METHOD FOR MANUFACTURING SAME

摘要

A cover glass for a pen input device has a haze value of less than 1%, and a Martens hardness within a range from 2000 N/mm2 to 4000 N/mm2. When a moving member receiving a load of 150 gf (1.47 N) is moved in one direction, at 10 mm/sec, at room temperature, on the surface of the cover glass, a coefficient of kinetic friction μk of a kinetic frictional force Fk (N) exerted by the cover glass surface within a region where an approximately linear relationship is established between the kinetic frictional force Fk (N) and the time is 0.14˜0.50, and a standard deviation σ (N) of the kinetic frictional force Fk (N) is no more than 0.03. The moving member is a pen that includes a pen tip made of polyacetal resin with a Rockwell hardness of M90 and having a radius of curvature of 700 μm.

主权项

1. A cover glass for a pen input device, the cover glass comprising a glass member having
a haze value of less than 1%; and a Martens hardness within a range from 2000 N/mm2 to 4000 N/mm2; wherein when a moving member receiving a load of 150 gf (1.47 N) is moved in one direction, at a velocity of 10 mm/sec, at room temperature, on a surface of the cover glass, a coefficient of kinetic friction μk of a kinetic frictional force Fk (N) between the moving member and the surface of the cover glass within a region where a relationship between the kinetic frictional force Fk (N) and time is approximated by a straight line is greater than or equal to 0.14 and less than or equal to 0.50, and a standard deviation σ (N) of the kinetic frictional force Fk (N) is less than or equal to 0.03; and wherein the moving member is a pen that includes a pen tip made of polyacetal resin having a Rockwell hardness of M90, and the pen tip has a radius of curvature of 700 μm.