WRITING BOARD SET AND PEEKING PREVENTION SYSTEM
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United States of America Patent
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Issued Date -
Oct 5, 2023
app pub date -
Mar 28, 2023
filing date -
Mar 28, 2023
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Abstract
A writing board set includes a writing board and a writing utensil containing ink. The writing board reflects back, when unpolarized light is incident on its surface at a viewer's side, polarized light which is parallel to a first direction and which has a degree of polarization of 95% or more. Ld*, ad*, and bd* are values of L*, a*, and b* as obtained by irradiating the surface of the writing board with light that has been transmitted through a polarizing layer having a transmission axis which is orthogonal to the first direction, and measuring total reflectance through spectrophotometry. Li*, ai*, and bi* are values of L*, a*, and b* as obtained by irradiating the ink having been introduced onto a surface of a glass panel with unpolarized light, and measuring total reflectance through spectrophotometry. A color difference ΔE*ab as defined by eq. (1) is 19 or less:
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