IMAGE PROJECTION DEVICE

• Main Author: HOSOI NOBUHIRO
• Format: Patent
• Language: English; Japanese
• Published: 25.05.2017
• 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; ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION; CINEMATOGRAPHY; CRYPTOGRAPHY; DISPLAY; EDUCATION; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; ELECTROGRAPHY; HOLOGRAPHY; PHOTOGRAPHY; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; SEALS

PROBLEM TO BE SOLVED: To provide an image projection device capable of suppressing a temperature rise of an image formation part by suppressing a projection image becoming dark.SOLUTION: When light source lighting is stabilized after a predetermined time elapses from starting the light source lighting, a main control part 71 detects a luminance value γ of input image data (S2). When luminance value γ of input image data is equal to or more than a first threshold value α(γ≥α)(Yes of S3) or equal to or less than a second threshold value β(γ≤β )(Yes of S4), a light source control part is controlled (S5) so that the power supplied to the light source is reduced. On the other hand, when the luminance value γ of the detected input image data is smaller than the first threshold value α, and larger than the second threshold value β (β<γ<α) (No of S3, No of S4), the power is supplied to the light source.SELECTED DRAWING: Figure 11 【課題】投写画像が暗くなるのを抑えて、画像形成部の温度上昇を抑えることができる画像投写装置を提供する。【解決手段】光源点灯開始してから所定時間経過して光源点灯が安定したら、メイン制御部７１は、入力画像データの輝度値γを検出する（Ｓ２）。検出した入力画像データの輝度値γが、第１閾値α以上（γ≧α）のとき（Ｓ３のＹｅｓ）や第２閾値β以下（γ≦β）のとき（Ｓ４のＹｅｓ）は、光源に供給する電力を低下させるよう、光源制御部を制御する（Ｓ５）。一方、検出した入力画像データの輝度値γが、第１閾値α未満、第２閾値βを越える（β＜γ＜α）のとき（Ｓ３のＮｏ，Ｓ４のＮｏ）は、通常の電力を光源に供給する。【選択図】図１１