| 摘要 |
PROBLEM TO BE SOLVED: To simply discriminate the direction of a spiral structure by discriminating the direction of a spiral axis of a cholesteric medium according to a difference in quantity of light transmitted and reflected from right and left circularly polarized light areas by use of one circular polarization plate where right and left circularly polarized light transmitting areas exist. SOLUTION: Twoλ/4 plates are stuck to each other in such a manner as to share common boundary with each other on a linearly light polarizing plate. The axes are arranged in such a manner that the axis of the twoλ/4 plates intersect perpendicularly to each other, the transmission axis of the light polarizing plate is arranged at 45 degrees to the respective axes of theλ/4 plates, and the plates are stacked through a pressure sensitive adhesive agent. Thus, the left side is a left circular light polarizing plate and the right side is a right circular light polarizing plate. Light transmitted to be reflected by the cholesteric medium is observed through the right and left circular light polarizing plates to determine the torsional direction of a screw structure of the cholesteric medium from the quantity of light for a light source. That is, in the case where right or left circularly polarized light is incident, there is a difference in quantity of transmitted light transmitted through right and left circular light polarizing plates. Such contrast is observed to simply determine the torsional direction.
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