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A reverse flow preventing device arranged in a flow path of fluid formed by a fan and an electronic apparatus equipped with the same. The reverse flow preventing device has a frame, a plurality of support shafts arranged about the center of the frame and mounted on the frame, and a plurality of piv

A reverse flow preventing device arranged in a flow path of fluid formed by a fan and an electronic apparatus equipped with the same. The reverse flow preventing device has a frame, a plurality of support shafts arranged about the center of the frame and mounted on the frame, and a plurality of pivotable plate members supported by the support shafts. The plate members can move between the first position (reverse flow preventing position) in which they lie in a substantially single plane and the second position (normal operating position) in which they move. The support shafts and the plate members are arranged substantially concentrically or radially.

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The invention claimed is: 1. A reverse flow preventing device arranged in a flow path of fluid formed by a fan, said device comprising: a frame; a plurality of support shafts arranged about a center of said frame and mounted on said frame; and a plurality of pivotable plate members supported by sai

The invention claimed is: 1. A reverse flow preventing device arranged in a flow path of fluid formed by a fan, said device comprising: a frame; a plurality of support shafts arranged about a center of said frame and mounted on said frame; and a plurality of pivotable plate members supported by said support shafts, wherein said frame has a central portion, a peripheral portion arranged about said central portion and spaced apart from said central portion, and connecting portions arranged between said central portion and said peripheral portion, wherein said support shafts are radially arranged on said central portion and said peripheral portion, wherein said plate member has a first plate portion and a second plate portion divided by said support shaft, and said plate member is curved to protrude in the direction of the flow of air produced by said fan, wherein said plate member has a length L and said support shaft is located at a position of L/4 of said plate member. 2. The device according to claim 1, wherein said plate members are radially arranged. 3. A reverse flow preventing device arranged in a flow path of fluid formed by a fan, said device comprising: a frame; a plurality of support shafts arranged about a center of said frame and mounted on said frame; and a plurality of pivotable plate members supported by said support shafts, said plate member having a first plate portion and a second plate portion divided by said support shaft, and said plate member is curved to protrude in the direction of the flow of air produced by said fan, wherein said plate member has a length L and said support shaft is located at a position of L/4 of said plate member, wherein said plate members can move between a first position in which they lie in a substantially single plane and a second position in which they move toward the side opposite to an axial flow fan. 4. The device according to claim 3, further comprising an elastic member biasing said plate member toward said first position. 5. An electronic apparatus comprising an electronic apparatus casing including an electronic part, a fan, and a reverse flow preventing device arranged in a flow path of fluid formed by said fan according to one of claims 1, 2, 3, and 4.