IMAGE PROJECTION DEVICE AND CONTROL METHOD OF IMAGE PROJECTION DEVICE

• Main Authors: MIKUTSU YASUNARI, NISHI YUKIMI, HIRAMATSU TAKAHIRO, TSUCHIYA SATOSHI
• Format: Patent
• Language: English; Japanese
• Published: 28.12.2017
• 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; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; ELECTROGRAPHY; HOLOGRAPHY; PHOTOGRAPHY; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION

PROBLEM TO BE SOLVED: To provide an image projection device capable of preventing a noise from occurring when performing a pixel shift control.SOLUTION: An image projection device 1 includes: a light source 30 configured to emit light; an image display unit 50 having a DMD 551 configured to form an image using light from the light source 30; an optical part (an illumination optical system unit 40, a projection optical system unit 60) to guide the light from the light source 30 to the image display unit 50 while enlarging and projecting the image formed by the image display unit 50; driving means (a movable unit 55) configured to periodically deviate at least part of the DMD 551 or the optical part; and a fan 20 configured to cool at least part of an inside of the image projection device 1. In the fan 20, an operation sound generated from the fan 20 has a predetermined frequency characteristic according to a drive frequency of the driving means.SELECTED DRAWING: Figure 5 【課題】画素ずらし制御をする場合に、騒音の発生を抑制する画像投影装置を提供する。【解決手段】画像投影装置１は、光を出射する光源３０と、光源３０からの光を用いて画像を形成するＤＭＤ５５１を有する画像表示ユニット５０と、光源３０からの光を画像表示ユニット５０に導くとともに、画像表示ユニット５０によって形成された画像を拡大投影する光学部（照明光学系ユニット４０、投影光学系ユニット６０）と、ＤＭＤ５５１、または光学部の少なくとも一部を周期的に変位させる駆動手段（可動ユニット５５）と、画像投影装置１内部の少なくとも一部を冷却するファン２０と、を備え、ファン２０は、ファン２０から発生する動作音が、駆動手段の駆動周波数に応じた所定の周波数特性を有している。【選択図】図５