PROJECTOR

• Main Authors: MIZUTANI TOMOYA, KASHIWAGI AKIHIRO
• Format: Patent
• Language: English; Japanese
• Published: 17.05.2024
• Subjects: ACCESSORIES THEREFOR; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES; APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM; CINEMATOGRAPHY; 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; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; ELECTROGRAPHY; FREQUENCY-CHANGING; HOLOGRAPHY; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PHOTOGRAPHY; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

To prevent, in a single plate type projector, deformation and alteration of a lens arranged on an optical path closer to a light source than a reflective polarizer, and reduction in optical performance of the lens.SOLUTION: A projector of the present invention comprises: a light source that emits first light; a wavelength conversion element that is irradiated with the first light and emits second light having an emission wavelength different from that of the first light; an optical system that enlarges a beam of the first light and a beam of the second light from the wavelength conversion element; a collimating lens that collimates the rays of light enlarged by the optical system; an optical modulation element that converts the incident light to generate image light; an emission-side polarization element that makes incident the image light emitted from the optical modulation element; a projection lens that projects the image light emitted from the emission-side polarization element; and an incident-side polarization element that transmits polarized light in a predetermined polarization direction and reflects polarized light in directions other than the predetermined polarization direction. Non-linear polarized light is incident on the incident-side polarization element, and on an optical path of the second light, the incident-side polarization element is arranged between the light source and the collimating lens.SELECTED DRAWING: Figure 1 【課題】単板式のプロジェクターにおいて、反射偏光子よりも光源側の光路上に配置されているレンズの変形及び変質、レンズの光学機能の低下を防止する。【解決手段】本発明のプロジェクターは、第１光を発光する光源と、第１光が照射され、第１光とは異なる発光波長を有する第２光を発光する波長変換素子と、波長変換素子からの第１光の光束と第２光の光束とを拡大する光学系と、光学系によって拡大化された光を平行化する平行化レンズと、入射した光を変調して画像光を生成する光変調素子と、光変調素子から射出された画像光が入射する射出側偏光素子と、射出側偏光素子から射出された画像光を投射する投射レンズと、所定の偏光方向の偏光を透過し、所定の偏光方向以外の偏光を反射する入射側偏光素子と、を備える。入射側偏光素子には非直線偏光が入射し、第２光の光路上において、入射側偏光素子は光源と平行化レンズとの間に配置されている。【選択図】図１