PROJECTION DEVICE AND VIRTUAL IMAGE DISPLAY DEVICE

• Main Authors: HONMA KAZUKI, TACHIUMI MASARU
• Format: Patent
• Language: English; Japanese
• Published: 20.04.2015
• Subjects: ACCESSORIES THEREFOR; ADVERTISING; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES; APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS INVEHICLES; ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OFTRANSMISSIONS IN VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GASEXHAUST OR FUEL SUPPLY OF PROPULSION UNITS, IN VEHICLES; ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION; AUXILIARY DRIVES FOR VEHICLES; CINEMATOGRAPHY; CRYPTOGRAPHY; DISPLAY; EDUCATION; ELECTROGRAPHY; HOLOGRAPHY; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PERFORMING OPERATIONS; PHOTOGRAPHY; PHYSICS; SEALS; TRANSPORTING; VEHICLES IN GENERAL

PROBLEM TO BE SOLVED: To enable automatic focus with high accuracy by a simple constitution.SOLUTION: A control unit 300 causes a projection optical system (reflection type display element 230) to display a test image J, performs positional adjustment of an image Ja for positional adjustment being the test image J on a light intensity detection unit 270 disposed in the vicinity of a transmission screen 260, and then controls a movement mechanism 250 on the basis of an output signal from the light intensity detection unit 270 by an image Jb for focus adjustment to move projection means 240 so as to perform focus adjustment of a display image M displayed on the transmission screen 260. 【課題】簡単な構成で、高精度に自動フォーカスができる。【解決手段】コントロールユニット３００は、投射光学系（反射型表示素子２３０）にテスト画像Ｊを表示させ、テスト画像Ｊである位置調整用画像Ｊａを透過スクリーン２６０の近傍に配設した光強度検出部２７０上に位置調整した後、フォーカス調整用画像Ｊｂによる光強度検出部２７０からの出力信号に基づき移動機構２５０を制御して投射手段２４０を移動させることで、透過スクリーン２６０上に表示される表示画像Ｍのフォーカス調整を行うものである。【選択図】 図３