| 摘要 |
A circuit board provided with a control circuit and an optical module placed at a close distance and configured to be capable of effectively cooling the control circuit and the optical module is provided. A circuit board placed inside the housing of electronic equipment and provided with an optical module and a control circuit, which are mutually connected, has: a fan-assisted heat sink mounted on the control circuit and configured to ventilate the control circuit and cool the control circuit; and a fresh air feeding duct placed on the circuit board and configured to distribute fresh air taken in from outside the housing through the intake of the fan-assisted heat sink. The optical module is placed in a predetermined position along a site in which the fresh air feeding duct is formed.
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