PORTABLE OPTICAL READING DEVICE

PROBLEM TO BE SOLVED: To provide a portable optical reading device capable of preventing deterioration of reading performance even when diffuse illumination is performed using a diffuser panel.SOLUTION: A portable optical reading device comprises an imaging unit for imaging an object to be read, an LED illumination device emitting light to a symbol imaged by the imaging unit and a diffuser panel for diffusing light emitted from the LED illumination device. The diffuser panel includes a rear end face on which the imaging unit is disposed and a side face including a light emission surface ES connected to the rear end face so as to surround an imaging axis defining an imaging direction by the imaging unit and having the LED illumination device at the outside thereof and an opposite surface OS opposite to the emission surface ES and the imaging axis, with permeability of illumination light of 70% or higher.SELECTED DRAWING: Figure 18 【課題】拡散板を利用して拡散照明を行う場合であっても、読取性能の低下を防げる携帯型光学読取装置を提供する。【解決手段】読取対象を撮像する撮像部と、撮像部により撮像されるシンボルに光を出射するＬＥＤ照明と、ＬＥＤ照明から出射された光を拡散させる拡散板とを備える携帯型光学読取装置であって、拡散板は、撮像部が配設される後端面と、撮像部による撮像方向を画定する撮像軸を取り囲むよう後端面に連設すると共に、ＬＥＤ照明が外側に配設される発光面ＥＳと、発光面ＥＳと撮像軸に対して対向する、照明光の透過率が７０％以上の対向面ＯＳとを含む側面とを備えるよう構成する。【選択図】図１８