| 摘要 |
PROBLEM TO BE SOLVED: To provide a small-sized laser exposer wherein the life of a semicon ductor laser is improved and the exchanging frequency of a semiconductor laser is reduced. SOLUTION: This laser exposer which exposes a recording medium to a light by using plural semiconductor lasers is constituted of a strip type holding block 101 composed of material having high thermal conductivity, plural semiconductor lasers 103 arranged on the holding block 101, a cooling means 111 disposed on the holding block 101, and a heat transporting means which is disposed on the holding block 101 and transfers heat of the block 101 to the cooling means 111.
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