Back to results
US 12,669,482 B2Granted
Flexoelectric liquid crystal composition, liquid crystal element, laser inspection system, and method for analyzing test subject
AssigneeTokyo University of Science Foundation
InventorsTakeo Sasaki, Yumiko Naka, Van Khoa Le, Takaaki Yagami, Yukihiro Ishii
Life of this patent
Estimating the term…
Abstract
A flexoelectric liquid crystal composition containing at least one kind of smectic liquid crystal compound, a chiral dopant, and a charge scavenger, and exhibiting photoconductivity. By using the liquid crystal composition exhibiting a flexoelectric effect, a response speed of a photorefractive effect is excellent. Furthermore, the flexoelectric liquid crystal composition containing the smectic liquid crystal compound suppresses light scattering.
Claims12
A laser inspection system, comprising:
- a first laser emission unit that generates ultrasonic vibration on a surface of a test subject by irradiating the test subject with a pulse oscillation laser;
- a second laser emission unit that emits a continuous oscillation laser;
- a first beam splitter that is irradiated with the pulse oscillation laser emitted from the first laser emission unit and the continuous oscillation laser emitted from the second laser emission unit and splits the continuous oscillation laser emitted from the second laser emission unit into irradiation light to be irradiated to the surface of the test subject and reference light;
- a liquid crystal element that receives reflected light that is the irradiation light irradiated to the surface of the test subject and reflected from the test subject and the reference light, and causes the reflected light and the reference light to interfere with each other;
- a detection unit that detects at least one of the irradiation light or the reference light emitted from the liquid crystal element;
- and
- a second beam splitter that is positioned between the test subject and the liquid crystal element, reflects the irradiation light to be split by the first beam splitter toward the test subject, and transmits the reflected light to be reflected by the test subject toward the liquid crystal element;
- wherein the liquid crystal element includes a liquid crystal film formed by a flexoelectric liquid crystal composition;
- and a pair of transparent substrates sandwiching the liquid crystal film, and
- wherein the flexoelectric liquid crystal composition exhibits photoconductivity, and contains at least one kind of smectic liquid crystal compound;
- a chiral dopant;
- and a charge scavenger,
- wherein a content of the chiral dopant is 0.1 parts by mass to 5 parts by mass with respect to 100 parts by mass of a total amount of the smectic liquid crystal compound.
10 more elements
A laser inspection system, comprising:
- a first laser emission unit that generates ultrasonic vibration on a surface of a test subject by irradiating the test subject with a pulse oscillation laser;
- a second laser emission unit that emits a continuous oscillation laser;
- a first beam splitter that is irradiated with the pulse oscillation laser emitted from the first laser emission unit and the continuous oscillation laser emitted from the second laser emission unit and splits the continuous oscillation laser emitted from the second laser emission unit into irradiation light to be irradiated to the surface of the test subject and reference light;
- a liquid crystal element that receives reflected light that is the irradiation light irradiated to the surface of the test subject and reflected from the test subject and the reference light, and causes the reflected light and the reference light to interfere with each other;
- and
- a detection unit that detects at least one of the irradiation light or the reference light emitted from the liquid crystal element;
- and
- a second beam splitter that is positioned between the test subject and the liquid crystal element, reflects the irradiation light to be split by the first beam splitter toward the test subject, and transmits the reflected light to be reflected by the test subject toward the liquid crystal element;
- wherein the liquid crystal element includes a liquid crystal film formed by a ferroelectric liquid crystal composition and a pair of transparent substrates sandwiching the liquid crystal film.
6 more elements
Dependencies are inferred from the claim text.