Constant-temperature apparatus with thermoelectric device

Claim 1

A CONSTANT-TEMPERATURE APPARATUS WITH A THERMOELECTRIC DEVICE, COMPRISING A CONSTANT-TEMPERATURE STRUCTURE, A THERMOELECTRIC ELEMENT HAVING THE PELTIER EFFECT, A TEMPERATURE DETECTING DEVICE FOR DETECTING THE TEMPERATURE WITHIN THE SAID STRUCTURE, THE CONTACT ON ONE SIDE OF THE SAID ELEMENT AND THE SAID DEVICE BEING INSTALLED WITHIN THE SAID STRUCTURE, A TEMPERATURE COMPENSATED TRANSISTOR AMPLIFICATION CIRCUIT SUCH AS DIFFERENTIAL CIRCUIT WHICH, IN ITS AT LEAST INITIAL STAGE, AMPLIFIES THE OUTPUT OF THE SAID TEMPERATURE DETECTING DEVICE, A TRANSISTOR CIRCUIT WHICH IS CONNECTED IN SERIES WITH THE SAID THERMOELECTRIC ELEMENT AND IS DRIVEN BY THE AMPLIFIED OUTPUT OF THE SAID DIFFERENTIAL AMPLIFICATION CIRCUIT, AND A POWER SUPPLY SYSTEM; A VARIABLE RESISTANCE CONTROLLING THE BIAS OF SAID TRANSISTOR AMPLIFICATION CIRCUIT; THE SAID TRANSISTOR CIRCUIT BY SAID VARIABLE RESISTANCE BEING CAPABLE OF CONTROLLING THE INFLOW CURRENT OF THE SAID THERMOELECTRIC ELEMENT, IN ACCORDANCE WITH THE SAID AMPLIFIED OUTPUT OF THE SAID DIFFERENTIAL AMPLIFICATION CIRCUIT, IN SUCH A MANNER AS TO CAUSE THE TEMPERATURE WITHIN THE SAID STRUCTURE TO COINCIDE WITH A PREDETERMINED, SET VALUE, AND, AT THE SAME TIME, THE RANGE OF FLUCTUATION OF THE INFLOW CURRENT OF THE SAID THERMOELECTRIC ELEMENT BEING SO PREDETERMINED THAT ITS ABSOLUTE VALUE IS WITHIN APPROXIMATELY TWO-THIRDS OF THE CURRENT VALUE PRODUCING THE MAXIMUM TEMPERATURE DROP IN THE SAID THERMOELECTRIC ELEMENT.