Recording structure for optical reading and its manufacture

Abstract

Abstract PURPOSE:To surely optically reading a code such as a bar code or a character by composing an area to optically read of a first surface part which is made into a finely roughened surface and a second surface part having a lower reflectance than the first part. CONSTITUTION:Since an area to optically read is composed of a first surface part 20 which has been made into the finely roughened surface, and a second surface part 21 having the lower reflection than the first part, when irradiated by light it is irregularly reflected in an approximately even way by the roughened surface of the first surface part 20. Consequently, the coarse surface irradiated by light can be prevented from reflecting with sharp directionality. Thus, the reflected light from the first surface part 20 and the reflected light from the second surface part 21 are surely received, and the level of the light receiving quantity can be discriminated. Thus, the recording contents in the area to optically read can be surely detected.

Inventors

• 👤 Yoshiro Fujioka
• 👤 藤岡　芳朗
• 👤 Tsutomu Haba
• 👤 羽場　勉

Bibliographic Details