STUDENT LIBRARY Russian patent published in 1997 - IPC

FIELD: education. SUBSTANCE: library has information carriers and is designed as case which contains four rotation cartridges which are located in two layers and hold holographic information carriers which are driven by step electric motors. Holographic information carriers are mounted in radial guides of rotation cartridges for sliding movement in arbitrary order. Slid cartridges are to be connected to information write-read unit which is located in case. First and second rotation cartridges, which are located in first level of case, are shifted with respect to third and fourth cartridges, which are located in second level, by distance which is equal to three radiuses of cartridges in order to achieve alignment of rotation axes of second and third cartridges. EFFECT: increased functional capabilities. 3 dwg