PORTABLE OPTICAL READING DEVICE

PROBLEM TO BE SOLVED: To achieve both of diffuse illumination and polarization illumination and to miniaturize a handy scanner.SOLUTION: A portable optical reading device includes LED light sources 2911 to 2914 which emit light to a symbol to be read, a diffusion plate 23 which diffuses the light emitted from the LED light sources 2911 to 2914, an opening 2431 which is formed in the diffusion plate 23 and through which diffusion reflected light obtained by reflecting diffusion light emitted from the LED light sources 2911 to 2914 on the symbol passes, an imaging part 41 which receives the diffusion reflected light through the opening 2431, to image the symbol, an LED light source 2915 which emits the light to the symbol, a polarization element for light projection 242 which polarizes the light emitted from the LED light source 2915, an opening 2432 which is formed in the diffusion plate 23 and through which polarized light emitted from the LED light source 2915 passes, and a polarization element for light reception 241 which polarizes polarized reflection light obtained after the polarized light emitted from the LED light source 2915 is reflected on the symbol and passes through the opening 2431.SELECTED DRAWING: Figure 24 【課題】拡散照明及び偏光照明の双方を実現し、ハンディスキャナの小型化に資する。【解決手段】読取対象となるシンボルに光を出射するＬＥＤ光源２９１１〜２９１４と、ＬＥＤ光源２９１１〜２９１４から出射された光を拡散させる拡散板２３と、拡散板２３に形成され、ＬＥＤ光源２９１１〜２９１４から出射された拡散光がシンボル上で反射した拡散反射光を通過させる開ロ２４３１と、開ロ２４３１を介して、拡散反射光を受光し、シンボルを撮像する撮像部４１と、シンボルに光を出射するＬＥＤ光源２９１５と、ＬＥＤ光源２９１５から出射された光を偏光する投光用偏光素子２４２と、拡散板２３に形成され、ＬＥＤ光源２９１５から出射された偏波光を通過させる開ロ２４３２と、ＬＥＤ光源２９１５から出射された偏波光がシンボル上で反射し、開ロ２４３１を通過した偏波反射光を偏光する受光用偏光素子２４１とを備える。【選択図】図２４