HOLOGRAPHIC ROM REPRODUCING SYSTEM, PARTICULARLY RELATED TO PREVENTING AN SNR DETERIORATION WHILE REPRODUCING DATA REGARDLESS OF INTERNAL TEMPERATURE

摘要

PURPOSE: A holographic ROM reproducing system is provided to reproduce data by using two light sources having different output wavelength bands and different operational temperatures, thereby preventing an SNR(Signal to Noise Ratio) from deteriorating. CONSTITUTION: A pickup unit(200) includes the first light source(204) and the second light source(206) for supplying a reproduction reference light to a storage medium(224) by turning on one of the first and second light sources(204,206) according to an internal temperature. A temperature sensor(222) senses the internal temperature. A controller(228) turns on one of the first light source(204) and the second light source(206) based on the temperature sensed by the temperature sensor(222).