| 摘要 |
<p>PURPOSE:To perform a uniform temperature control with high reproducibility by a method wherein a plurality of blocks are driven in a time sharing system at a timing in which an electric current demand state within a conduction pulse applying time to a heating element belonging to an arbitrary block has a different part from an electric current demand state within a conduction pulse applying time to a heating element belonging to another block to which a pulse is applied with a delay therefrom. CONSTITUTION:A plurality of heating elements are divided into a plurality of blocks. A shift time in a time sharing drive for applying a conduction pulse per block is (dt). A peak current part 44 of the N-th block is overlapped with a small current part 43 of the (N-1)-th block. A peak current part of the (N+1)-th block is also overlapped with small current parts of the other blocks. A time from (ton) to (tp) as a peak current part varies more or less in accordance with an initial temp. of a related heating element so as to extend with a lower initial temp.. Therefore, it is desirable for a power source efficiency to prevent even the momentary overlap of the times from (ton) to (tp) in the respective blocks. Thus, the time sharing drive of the blocks may be conducted at a timing in which a (dt) is set slightly longer than a (ton) - (tp) time at a minimum action guarantee temp. of a recorder.</p> |
