Abstract: A cooling apparatus 1 boiling and condensing refrigerant is constructed to have a stacked construction by stacking a plurality of pressed members 3 and comprises a refrigerant tank portion, a heat exchanging portion and a refrigerant diffusing portion. First openings for passing refrigerant and second openings for passing cooling water are formed in the pressed members 3 used for the heat exchanging portion and the first openings communicate with internal spaces formed in the refrigerant tank portion and the refrigerant diffusing portion. According to the construction, as the cooling apparatus has the stacked construction, tubes and fins that constitute a conventional heat dissipating portion can be eliminated.

Abstract: A first intermediate plate 5C adjacent to a heat receiving plate 5A and a second intermediate plate 5D adjacent to the first intermediate plate 5C are provided so that the slit width of the openings (first opening 5a) in the first intermediate plate 5C is wider than that (second opening 5b) in the second intermediate plate 5D. In this way, when the first intermediate plate 5C and the second intermediate 5D are stacked, a tunnel structure is formed in which the opening dimension L3 (the opening dimension of the second openings 5b) of the communicating sections through which the first openings 5a and the second openings 5b communicate with each other is smaller than the length L2 (the opening dimension of the first openings 5a) of the tunnel portions (L2>L3). Therefore, a heat-generating member with large density of heat generation can be effectively cooled.

Abstract: Residual stress generated in strip metal W is removed by annealing the strip metal W which has gone through a pressing process, and a compressing process is implemented thereafter whereby, as portions hardened due to work-hardening (in particular, folded portions 121) can be softened, the strip metal W which has gone through the pressing process can be easily compressed so that the radius of curvature of the folded portions 121 is reduced to a predetermined dimension, thereby making it possible to improve the dimensional accuracy of the finished fin 120 even if the fin 120 is made of a metal having a relatively high hardness (stainless steel).

Abstract: A first intermediate plate 5C adjacent to a heat receiving plate 5A and a second intermediate plate 5D adjacent to the first intermediate plate 5C are provided so that the slit width of the openings (first opening 5a) in the first intermediate plate 5C is wider than that (second opening 5b) in the second intermediate plate 5D. In this way, when the first intermediate plate 5C and the second intermediate 5D are stacked, a tunnel structure is formed in which the opening dimension L3 (the opening dimension of the second openings 5b) of the communicating sections through which the first openings 5a and the second openings 5b communicate with each other is smaller than the length L2 (the opening dimension of the first openings 5a) of the tunnel portions (L2>L3). Therefore, a heat-generating member with large density of heat generation can be effectively cooled.

Abstract: A cooling apparatus 1 boiling and condensing refrigerant is constructed to have a stacked construction by stacking a plurality of pressed members 3 and comprises a refrigerant tank portion, a heat exchanging portion and a refrigerant diffusing portion.

Abstract: Residual stress generated in strip metal W is removed by annealing the strip metal W which has gone through a pressing process, and a compressing process is implemented thereafter whereby, as portions hardened due to work-hardening (in particular, folded portions 121) can be softened, the strip metal W which has gone through the pressing process can be easily compressed so that the radius of curvature of the folded portions 121 is reduced to a predetermined dimension, thereby making it possible to improve the dimensional accuracy of the finished fin 120 even if the fin 120 is made of a metal having a relatively high hardness (stainless steel).