DEVICE WHICH READS DATA FROM HOLOGRAPHIC CARD Russian patent published in 1998 - IPC

FIELD: devices which read digital information. SUBSTANCE: device has base 1 which carry photodetector matrix 2 and laser unit 3 between which pocket 12 for holographic card 19 is located. In addition ledge 4 is rigidly mounted on base 1 between photodetector matrix 2 and pocket 12. Ledge has two holes: hole A is used for passing reading beam and has two counter clamshell pins 5 and hole B is designed for terminal of chip switch 6. System of fixing levels is designed as vertical shaft 8 with handle 7 which is mounted on base 1 for rotation at right angle. Shaft 8 carries two cams 9 and 10. Cam 9 is located in fork 11 which is rigidly connected to pocket 12 which is located in parallel to ledge 4. Fork 11 is connected to base 1 by means of mobile parallelogram connection. Cam 10 is connected to horizontal spring-loaded shaft 16 which one end rests in lever 17 which is spring-loaded with respect to ledge 4 and is used for switching chip switch 18 for fixing holographic card 19. It is spring-loaded by fixing member 15. Pocket 12 has holes C and D which are coaxial to holes A and B in ledge 4 for terminal of chip switch 6 and passing light from laser unit 3. EFFECT: increased reliability of reading digital information from hologram. 1 dwg