| 摘要 |
A print "reading" device for use in an educational method comprises a printed substrate (1) on which is printed text or images, for example text (2), and related coded information (3) printed in fixed relation thereto. A wand (4) has a viewing window (5) through which a portion of text (2) can be viewed and a code reading device (7) positioned to read coded information (3) relating thereto. Logic circuitry (8) associated with device (7) produces a pre-determined response (10) to the code being read which is displayed on an LCD display (6). The code (3) is suitably a bar code comprising a plurality of bars (11A to 11D) printed in an "ink" which is invisible or only partially visible in normal illumination conditions. The bar code is read using device (7) which comprises a light source (13) and photodetectors (15A to 15D). |
