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.
1. A circuit board placed inside a housing of electronic equipment and provided with an optical module and a control circuit, which are mutually connected, the circuit board comprising:
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 an intake of the fan-assisted heat sink, the fresh air feeding duct having first and second end sides, and
the fresh air feeding duct takes in fresh air through a fresh air inlet of one end side and distributes the fresh air up to the fan-assisted heat sink on the other end side,
wherein the optical module is placed in a predetermined position inside or outside a duct path of the fresh air feeding duct along a site in which the fresh air feeding duct is formed.
2. The circuit board according to claim 1 , wherein the optical module is placed inside the fresh air feeding duct.
3. The circuit board according to claim 1 , wherein an outlet through which fresh air flown into the fan-assisted heat sink is exhausted is formed so as not to face to the fresh air feeding duct.
4. A circuit board placed inside a housing of electronic equipment and provided with an optical module and a control circuit, which are mutually connected, the circuit board comprising:
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 an intake of the fan-assisted heat sink,
wherein the optical module is placed in a predetermined position inside or outside a duct path of the fresh air feeding duct along a site in which the fresh air feeding duct is formed, and
wherein the optical module is placed on a back face side of the site where the fresh air feeding duct is formed on the circuit board.
5. The circuit board according to claim 4 , wherein an optical module heat sink configured to cool the optical module is placed inside the fresh air feeding duct in a site on an opposite side of the circuit board corresponding to the site where the optical module is placed.
6. The circuit board according to claim 5 , wherein the optical module heat sink is placed so that a fresh air flow inlet of the optical module heat sink faces a fresh air inlet through which fresh air flows into the fresh air feeding duct.
7. A circuit board placed inside a housing of electronic equipment and provided with an optical module and a control circuit, which are mutually connected, the circuit board comprising:
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 an intake of the fan-assisted heat sink, wherein:
the optical module is placed in a predetermined position inside or outside a duct path of the fresh air feeding duct along a site in which the fresh air feeding duct is formed;
the intake of the fan-assisted heat sink is located upward at a predetermined height from a board face of the circuit board;
the fresh air feeding duct is formed on the board face of the circuit board along the board face, and is formed so that a height-direction position of the fresh air feeding duct with respect to the board face of the circuit board is higher in the vicinity of the site where the fan-assisted heat sink is placed; and
the optical module is placed in a site in which the fresh air feeding duct is formed with the height-direction position changed.
8. Electronic equipment having a circuit board inside a housing, the circuit board being provided with an optical module and a control circuit, which are mutually connected, wherein:
the circuit board comprises: 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 an intake of the fan-assisted heat sink, the fresh air feeding duct having first and second end sides;
the fresh air feeding duct takes in fresh air through a fresh air inlet of one end side and distributes the fresh air up to the fan-assisted heat sink on the other end side, and
on the circuit board, the optical module is placed in a predetermined position inside or outside a duct path of the fresh air feeding duct along a site in which the fresh air feeding duct is formed.