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A telecommunication device includes a housing formed by gas-assist injection molding and having an inner wall, outer wall and a hollow space formed therebetween and receiving therein gas refrigerant. The hollow space has a plurality of vertical channels wherein the gas refrigerant cools the interna

A telecommunication device includes a housing formed by gas-assist injection molding and having an inner wall, outer wall and a hollow space formed therebetween and receiving therein gas refrigerant. The hollow space has a plurality of vertical channels wherein the gas refrigerant cools the internal of the housing by natural convection within the vertical channels. A movable wall is disposed in the vertical channel for controlling a pressure rise occurring upon a temperature rise.

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What is claimed is: 1. A telecommunication device, comprising: a housing comprising an inner wall, an outer wall, and a hollow space formed between said inner wall and said outer wall and receiving therein refrigerant, and an internal circuit having a portion coupled to said inner wall via a heat c

What is claimed is: 1. A telecommunication device, comprising: a housing comprising an inner wall, an outer wall, and a hollow space formed between said inner wall and said outer wall and receiving therein refrigerant, and an internal circuit having a portion coupled to said inner wall via a heat conductive member, wherein said outer wall is periodically variably shaped in cross section to define a periodically varying border between the hollow space and a medium outside of the telecommunication device, and further comprising an inlet port and an outlet port arranged on the outer wall. 2. The telecommunication device as defined in claim 1, wherein said hollow space is completely filled with refrigerant in a gas state throughout the operational temperature range of the internal circuit. 3. The electronic device as defined in claim 1, wherein the heat conductive member is a discrete heat conductive sheet. 4. The telecommunication device as defined in claim 1, wherein said outer wall is of a constant thickness along its periodically varying shape. 5. The telecommunication device as defined in claim 1, wherein said hollow space includes a plurality of channels in a vicinity of said outer wall. 6. The telecommunication device as defined in claim 1, wherein said refrigerant is a gas refrigerant. 7. The telecommunication device as defined in claim 6, wherein said housing includes a pressure control mechanism. 8. The telecommunication device as defined in claim 7, wherein said pressure control mechanism includes a movable wall. 9. The telecommunication device as defined in claim 7, wherein said pressure control mechanism includes a movable piston. 10. The telecommunication device as defined in claim 1, further comprising a pressure control mechanism for controlling a pressure in said hollow space. 11. The telecommunication device as defined in claim 10, wherein said pressure control mechanism includes a movable wall. 12. The telecommunication device as defined in claim 10, wherein said pressure control mechanism includes a movable piston. 13. A telecommunication device, comprising: a housing comprising an inner wall, an outer wall, and a hollow space formed between said inner wall and said outer wall and receiving therein refrigerant, and an internal circuit having a portion coupled to said inner wall via a heat conductive member, wherein said outer wall is periodically variably shaped in cross section to define a periodically varying border between the hollow space and a medium outside of the telecommunication device, and wherein the periodically shaped outer wall comprises a plurality of wave shapes, and further comprising an inlet port arranged on the distal end surface of a first wave shape, and an outlet port arranged on the distal end surface of a second wave shape different from the first. 14. A telecommunication device, comprising: a housing comprising an inner wall, an outer wall, and a hollow space formed between said inner wall and said outer wall and receiving therein refrigerant, and an internal circuit having a portion coupled to said inner wall via a heat conductive member, wherein said outer wall is periodically variably shaped in cross section to define a periodically varying border between the hollow space and a medium outside of the telecommunication device, wherein the periodically shaped outer wall comprises a plurality of wave shapes, and wherein the wave shapes comprise protruding fins with refrigerant therein, and further comprising an inlet port arranged on the distal end surface of a first protruding fin, and an outlet port arranged on the distal end surface of a second protruding fin different from the first. 15. A telecommunication device, comprising: a housing comprising an inner wall, an outer wall, and a hollow space formed between said inner wall and said outer wall and receiving therein refrigerant, and an internal circuit having a portion coupled to said inner wall via a heat conductive member, wherein said outer wall is periodically variably shaped in cross section to define a periodically varying border between the hollow space and a medium outside of the telecommunication device, and wherein the periodically shaped outer wall comprises repeating radiation fins separated in a longitudinal direction of the device by gaps, and the refrigerant is provided within the radiation fins, and further comprising an inlet port arranged on the distal end surface of a first radiation fin, and an outlet port arranged on the distal end surface of a second radiation fin different from the first. 16. A telecommunication device comprising: a housing comprising an inner wall, an outer wall, and a hollow space formed between said inner wall and said outer wall and receiving therein refrigerant, and an internal circuit having a portion coupled to said inner wall via a heat conductive member, wherein said outer wall is periodically variably shaped in cross section; and the periodically shaped outer wall comprises a plurality of wave shapes, the housing further comprising an inlet port arranged on the distal end surface of a first wave shape, and an outlet port arranged on the distal end surface of a second wave shape different from the first. 17. A telecommunication device comprising: a housing comprising an inner wall, an outer wall, and a hollow space formed between said inner wall and said outer wall and receiving therein refrigerant, and an internal circuit having a portion coupled to said inner wall via a heat conductive member, wherein said outer wall is periodically variably shaped in cross section; the periodically shaped outer wall comprises a plurality of wave shapes; and the wave shapes comprise protruding fins with refrigerant therein, the housing further comprising an inlet port arranged on the distal end surface of a first protruding fin, and an outlet port arranged on the distal end surface of a second protruding fin different from the first. 18. A telecommunication device comprising: a housing comprising an inner wall, an outer wall, and a hollow space formed between said inner wall and said outer wall and receiving therein refrigerant, and an internal circuit having a portion coupled to said inner wall via a heat conductive member, wherein said outer wall is periodically variably shaped in cross section; the periodically shaped outer wall comprises repeating radiation fins separated in a longitudinal direction of the device by gaps, and the refrigerant is provided within the radiation fins the housing further comprising an inlet port arranged on the distal end surface of a first radiation fin, and an outlet port arranged on the distal end surface of a second radiation fin different from the first.