PROBLEM TO BE SOLVED: To provide an information detector which detects abnormality of a device in advance.SOLUTION: An information detector comprises: irradiation means (110) which radiates light reflection means (425) which has a reflection rate of a first predetermined value or more light reception means (120) which receives return light of the light radiated by an irradiation part and determination means (230) which determines an irradiation condition of the irradiation means and/or a light reception condition of the light reception means according to whether an amount of the return light from the reflection means received by the light reception means is equal to or less than a second predetermined value.COPYRIGHT: (C)2015,JPO&INPIT【課題】情報検出器において、装置の異常を予め検出する。【解決手段】情報検出器は、光を照射する照射手段(110)と、第1所定値以上の反射率を有する反射手段(425)と、照射部から照射された光の戻り光を受光する受光手段(120)と、受光手段における反射手段からの戻り光の受光量が、第2所定値以下であるか否かに応じて、照射手段の照射状態又は受光手段の受光状態の少なくとも一方を判別する判別手段(230)とを備える。【選択図】図7
