| 摘要 |
<p>A film spool (1) for winding a photographic film has a recess (1a, 1b) formed in an axial end face thereof and a rib portion (2, 3) for rewind or the like is formed in the recess. The part of an injection mold defining the recess in the axial end face of the spool is formed of a telescopic member (31a, 31b) which is of material having a high thermal conductivity, and a heat pipe (33a, 33b) is provided to extend through the telescopic member near to the part defining the rib portion at one end and to project into a cooling channel (34a, 34b) at the other end.</p> |
