LIQUID CRYSTAL LENS AND OPTICAL HEAD UNIT

• Main Authors: WAKABAYASHI TAKEMORI, TAJIMA KOICHI, SUEKANE MICHINOBU
• Format: Patent
• Language: English
• Published: 22.03.2007
• Subjects: DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

PROBLEM TO BE SOLVED: To obtain a liquid crystal lens that can change its refracting power independently of the polarized direction of the incident light by applying a voltage, and obtain a temporary head unit using this liquid crystal lens. SOLUTION: The liquid crystal lens has transparent substrates facing each other, one of which has a Fresnel lens plane made of a transparent isotropic material on its surface facing the other substrate, and a liquid crystal layer disposed between those transparent substrates and consisting of positive dielectric anisotropic cholesteric liquid crystals or nematic liquid crystals added with a chiral agent. The height d[nm] of the convex of the Fresnel lens surface, the twist pitch P[nm] of the liquid crystal molecules of the filled liquid crystal, and the distance G[nm] between the two transparent substrate are predetermined values, thereby it is possible to obtain a liquid crystal lens that can switch its refractive power independently of the polarized direction of the incident linear polarized light by applying a voltage to the liquid crystal layer from the outside. COPYRIGHT: (C)2007,JPO&INPIT