IMAGING DEVICE, PROJECTION DEVICE, AND BEAM LIGHT CONTROL METHOD AND PROGRAM

• Main Author: OKADA SHUNJI
• Format: Patent
• Language: English; Japanese
• Published: 07.12.2015
• 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; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHOTOGRAPHY; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION

PROBLEM TO BE SOLVED: To attain a highly accurate autofocus control in a bright environment by spotlight irradiation even at a telephoto-end photography or in a dark environment.SOLUTION: An imaging device comprises: an imaging unit; and beam light that performs light irradiation, and an exposure control unit is configured to output exposure control information including at least any of information (EV value) on brightness of a photography environment, film sensitivity (ISO sensitivity), and aperture (F-value) setting value to a beam light control signal output unit. The beam light control signal output unit is configured to determine whether an amount of incident light is sufficient to control an autofocus control on the basis of the exposure control information, and is configured to output a control signal causing a subject to be irradiated with irradiation light of the beam light when the amount of incident light is not sufficient. Corresponding to the control signal, the beam light control signal output unit is configured to cause an exposure control of a camera to stop down an optical diaphragm, and thereby make depth of field deep to perform an automatic exposure, which in turn facilitates a focus of the camera. 【課題】テレ端撮影や暗い環境でも、スポットライト照射による明るい環境で高精度なオートフォーカス制御を実現する。【解決手段】撮像部と、光照射を行うビームライトを有し、露出制御部が、撮影環境の明るさ情報（ＥＶ値）、フィルム感度（ＩＳＯ感度）、絞り（Ｆ値）設定値の少なくともいずれかの情報を含む露出制御情報をビームライト制御信号出力部に出力する。ビームライト制御信号出力部は、露出制御情報に基づいて、入力光量がオートフォーカス制御に十分な光量であるか否かを判定し、十分でないと判定した場合、ビームライトの照射光を被写体に向けて照射させる制御信号を出力する。これに対応させてカメラの露出制御に光学絞りを絞り込み被写界深度を深くし自動露出させる。カメラのフォーカスを容易にさせる。【選択図】図５