Object temperature control device

Claim 1

In a temperature control device having means for detecting the temperature of an object whose temperature is to be controlled, a target temperature value setting means for setting a desired value of temperature for the object, an operation unit means for determining temperature sampling periods and for effecting a predetermined calculation of an on/off output ratio which is based upon the ratio of said detected object temperature to said target temperature value, and means for producing an output based upon said on/off output ratio, wherein said output is to control means to maintain the temperature of said object at substantially the set desired value, the improvement comprising: means for generating comparative output ratio signals during each sampling period by said operative unit means, and means for periodically comparing said on/off output ratio to said comparative output ratio signals by said operative unit means, whereby said output for control of said temperature is turned on in the next subsequent sampling period when said output ratio is greater than said comparative output ratio.