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In a casing, a printed circuit board is arranged such that a first side of the printed circuit board has a first angle of α° with respect to a first side surface plate. A cooling device is arranged to have a second angle of β with respect to the first side surface plate. Accordingly, an amount of co

In a casing, a printed circuit board is arranged such that a first side of the printed circuit board has a first angle of α° with respect to a first side surface plate. A cooling device is arranged to have a second angle of β with respect to the first side surface plate. Accordingly, an amount of cooling air flowing in and out via an air intake port and an air discharge port may be increased. Furthermore, by reducing the angle of the change in the flow direction of the cooling air flowing over the printed circuit board, the cooling air flowing over the printed circuit board may be made to efficiently flow through an air discharge port 119a. Furthermore, the efficiency with which a heat-generating component on the printed circuit board is cooled may be improved.

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1. An electronic device comprising: a casing that includes a front surface plate that has an air intake port, a back surface plate that has an air discharge port, the back surface plate opposes the front surface plate, a first side surface plate, a second side surface plate that opposes the first si

1. An electronic device comprising: a casing that includes a front surface plate that has an air intake port, a back surface plate that has an air discharge port, the back surface plate opposes the front surface plate, a first side surface plate, a second side surface plate that opposes the first side surface plate, and a shelf that is horizontally arranged;a printed circuit board that has a first side and a second side and that is arranged, in a space bounded by the front surface plate, the back surface plate, the first side surface plate and the second side surface plate, and is arranged on and parallel to the shelf, such that the first side is arranged to have a first angle of α (0°<α<90°) with respect to the first side surface plate; anda cooling device that includes an air inlet surface having an air inlet port and an air outlet surface having an air outlet port, the cooling device is arranged in the casing between the printed circuit board and the air discharge port in the space, such that the air inlet surface is arranged to have a second angle of β (0°<β<90°) with respect to the first side surface plate, a length of the air discharge port in a horizontal direction being substantially equal to an overall width of the cooling device along a direction of the air outlet surface multiplied by sin β, wherein a portion of the cooling device between the air inlet surface and the air outlet surface is outside of a projected view of the length of the air discharge port in the horizontal direction. 2. The electronic device according to claim 1, wherein the second angle βand the first angle α have a relationship that satisfies β≧α. 3. The electronic device according to claim 1, wherein the printed circuit board further comprises a heat-generating component arranged such that air flowing into the cooling device flows, over the printed circuit board, between a front side and a rear side of the printed circuit board, and the cooling device cools the heat-generating component 4. The electronic device according to claim 1, further comprising: a first duct that is arranged between the second side of the printed circuit board and the cooling device; anda second duct that is arranged between the cooling device and the second side surface plate. 5. The electronic device according to claim 1 , wherein the cooling device is a fan that includes a rotatable vane portion. 6. The electronic device according to claim 5, wherein the fan is an axial fan. 7. An electronic device comprising: a casing that includes a front surface plate that has an air intake port, a back surface plate that has an air discharge port and, the back surface plate opposes the front surface plate, a first side surface plate, a second side surface plate that opposes the first side surface plate, a shelf that is horizontally arranged, and a connecting circuit board that is arranged on the shelf;a plurality of printed circuit boards, each of the printed circuit boards has a first side and a second side and each of the printed circuit boards is arranged, in a space bounded by the front surface plate, the back surface plate, the first side surface plate and the second side surface plate, and each of the printed circuit boards is arranged on and parallel to the shelf, such that the first side is orthogonally connected to the connecting circuit board so as to have a first angle of α (0°<α<90°) with respect to the first side surface plate; anda cooling device that includes an air inlet surface having an air inlet port and an air outlet surface having an air outlet port, the cooling device is arranged in the casing, between the printed circuit boards and the air discharge port in the space, such that the air inlet surface is arranged to have a second angle of β (0°<β<90°) with respect to the first side surface plate, a length of the air discharge port in a horizontal direction being substantially equal to an overall width of the cooling device along a direction of the air outlet surface multiplied by sin β, wherein a portion of the cooling device between the air inlet surface and the air outlet surface is outside of a projected view of the length of the air discharge port in the horizontal direction. 8. The electronic device according to claim 7, wherein the second angle βand the first angle α have a relationship that satisfies β≧β. 9. The electronic device according to claim 7, wherein each of the printed circuit boards further comprises a heat-generating component is arranged such that air flowing into the cooling device flows, over the printed circuit boards, between a front side and a rear side of each of the printed circuit boards, and the cooling device cools the heat-generating component. 10. The electronic device according to claim 7, further comprising: a first duct that is arranged between the second side of each of the printed circuit boards and the cooling device; anda second duct that is arranged between the cooling device and the second side surface plate. 11. The electronic device according to claim 7, wherein the cooling device is a fan that includes a rotatable vane portion. 12. The electronic device according to claim 11, wherein the fan is an axial fan. 13. A casing for an electronic device, the casing comprising: a front surface plate that has an air intake port;a back surface plate that has an air discharge port and, the back surface plate opposes the front surface plate;a first side surface plate;a second side surface plate that opposes the first side surface plate;a shelf that has a first side and a second side that opposes the first side, the shelf is horizontally arranged, in a space bounded by the front surface plate, the back surface plate, the first side surface plate, and the second side surface plate, such that the first side has a first angle of α (0°<α<90°) with respect to the first side surface plate; anda cooling device that includes an air inlet surface having an air inlet port and an air outlet surface having an air outlet port, the cooling device is arranged in the casing, between the shelf and the air discharge port in the space, such that the air inlet surface is arranged to have a second angle of β (0°<β<90°) with respect to the first side surface plate, a length of the air discharge port in a horizontal direction being substantially equal to an overall width of the cooling device multiplied along a direction of the air outlet surface by sin β, wherein a portion of the cooling device between the air inlet surface and the air outlet surface is outside of a projected view of the length of the air discharge port in the horizontal direction. 14. The casing for the electronic device according to claim 13, wherein the second angle β and the first angle a have a relationship that satisfies β≧α. 15. The casing for the electronic device according to claim 13, further comprising: a first duct that is arranged between the second side of the shelf and the cooling device; anda second duct that is arranged between the cooling device and the second side surface plate. 16. The casing for the electronic device according to claim 13 wherein the cooling device is a fan that includes a rotatable vane portion. 17. The casing for the electronic device according to claim 16, wherein the fan is an axial fan.