LIGHT DEFLECTION DEVICE

• Main Author: FURUYAMA MASAKI
• Format: Patent
• Language: English; Japanese
• Published: 21.11.2019
• 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; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

To provide a light deflection device that can scan laser light as suppressing increase in size.SOLUTION: A light deflection device includes: a deflection element that has an incidence surface receiving laser light emitted from a light source, and makes the laser light deflect; and an incidence surface restriction unit that is provided between the light source and the deflection element, and restricts incidence of the laser light upon the incidence surface. The deflection element includes laminated first and second liquid crystal panels, and includes first and second units lined in a first direction. Each of the first and second liquid crystal panels includes: first and second substrates; a liquid crystal layer that is filled between the first and second substrates; a first electrode that is provided on the first substrate for each of the first and second units; and a first common electrode that is provided on the second substrate. The incidence surface restriction unit is configured to restrict the incidence of the laser light to a first range to be included in a range from a second end of the first electrode of the first liquid crystal panel in the first unit to a second end of the first electrode of the second liquid crystal panel in the second unit, of the incidence surface.SELECTED DRAWING: Figure 2 【課題】大型化を抑制しつつレーザ光を走査できる光偏向装置を提供する。【解決手段】光偏向装置は、光源から発光されたレーザ光を受ける入射面を有し、レーザ光を偏向させる偏向素子と、光源と偏向素子との間に設けられ、入射面へのレーザ光の入射を制限する入射面制限部と、を含む。偏向素子は、積層された第１及び第２液晶パネルを含み、第１方向に並ぶ第１及び第２単位を含む。第１及び第２液晶パネルの各々は、第１及び第２基板と、第１及び第２基板間に充填された液晶層と、第１及び第２単位毎に第１基板上に設けられた第１電極と、第２基板上に設けられた第１共通電極と、を含む。入射面制限部は、入射面のうち、第１単位における第１液晶パネルの第１電極の第２端から第２単位における第２液晶パネルの第１電極の第２端までの範囲に含まれる第１範囲へのレーザ光の入射を制限する。【選択図】図２