IMAGE READER

• Main Authors: MINOBE TADASHI, KUNIEDA TATSUYA, OKAMOTO TATSUKI, KONO HIROYUKI, MATSUZAWA TAKU
• Format: Patent
• Language: English; Japanese
• Published: 05.11.2015
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; PICTORIAL COMMUNICATION, e.g. TELEVISION

PROBLEM TO BE SOLVED: To provide an image reader large in depth of field and small in size.SOLUTION: The image reader comprises a light source 2, an image forming optical system 1, an imaging element 41, a memory 5, and a processor 6. The image forming optical system 1 comprises plural cells 11 as individually independent optical systems arranged in a main scanning direction 211, the cells being arrayed in two lines in a sub scanning direction 212. Each cell comprises a first reflection type condensing optical element 100, a first plane mirror 105, an aperture 101, and a second reflection type condensing optical element 102 which are arranged in order from a document 7, the aperture 101 being disposed at the rear-side focus position of the first reflection type condensing optical element 100 to form a telecentric optical system on the document side. 【課題】被写界深度が大きく、かつ小型の画像読取装置を提供する。【解決手段】光源２と、結像光学系１と、撮像素子部４１と、メモリ５と、処理装置６とを備え、結像光学系１は、それぞれが独立した光学系である複数のセル１１を主走査方向２１１に配置され、副走査方向２１２には２列に配列された画像読取装置であって、各セルは、第１反射型集光光学素子１００、第１平面鏡１０５、アパーチャ１０１、第２反射型集光光学素子１０２を原稿７からこの順に配置され、かつアパーチャ１０１を第１反射型集光光学素子１００の後側焦点位置に配置して上記原稿側にテレセントリックな光学系を形成している。【選択図】図１