Hoya Corporation

Hoev Company, Limited

Masatomo Shibui

Hiroshi Tomiyasu

Tomotaka Yokoyama

Nobuyuki Eto

Kazuaki Hashimoto

Go Chiwata

Dongna Qin

A cover glass for use in a mobile device such as a touch-panel mobile telephone has a thickness in the range of, for example, 0.3 mm to 1.5 mm. A recess that can be recognized as a character or a figure when watching from the front side of the mobile device or a recess that can be recognized when touching from the front side of the mobile device is formed on at least one of opposite main surfaces of the cover glass. A surface of this recess is an etched surface treated by etching.

Cover glass for a mobile device

There are disclosed an information recording medium substrate having a surface roughness of Rmax 15 nm or less, and an information recording medium, particularly an information recording medium substrate and information recording medium in which for surfaces of the substrate and medium, a bearing area value (offset bearing area value) in a depth of 0.5 to 5 nm (predetermined slice level) from a bearing height (real peak height) corresponding to the bearing area value of 0.2% to 1.0% is 90% or less, and a manufacture method of the substrate and medium.

Management technique of friction coefficient based on surface roughness, substrate for information recording medium, information recording medium and manufacture method thereof

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Tokyo, Japan

Masatomo Shibui