Heat sink fin and production process therefor

Claim 2

A process for producing a heat sink fin that is a monolithic combination of a bottom plate for receiving heat from a heat conducting plate and a plurality of heat dissipating pins arranged to form an array in two directions (X,Y) in the plane of said bottom plate portion and extending from the bottom plate, the process being characterized by comprising permitting a wire to run along a plurality of rows as the wire is urged against a workpiece, the wire being stretched on the same pitch as said heat dissipating pins are arranged in the X-direction and with an abrasive slurry present between the wire and said workpiece, thereby providing a semifinished product in which a row of parallel grooves having a predetermined depth and width have been formed in the surface of said workpiece under the grinding action of abrasive powder contained in said abrasive slurry, then permitting a wire to run along a plurality of rows as the wire is urged against said semifinished product in such a way that the row of parallel grooves in the surface of said semifinished product will cross the wire, the wire being stretched on the same pitch as said heat dissipating pins are arranged in the Y-direction, whereby the row of parallel walls between said parallel grooves in the surface of said semifinished product are cut to a predetermined depth under the action of said abrasive powder.

Claim 3

A process for producing a heat sink fin according to Claim 2 wherein the grooving operation in the X- and Y-directions is performed simultaneously with a level difference being provided between the wire stretched in the X-direction and the wire stretched in the Y-direction.

Claim 4

A heat sink fin comprising a bottom plate and a plurality of heat dissipating plates integrally formed with and extending in parallel from the. bottom plate, the heat dissipating plates each having a thickness of no more than 1 mm and being spaced apart by a gap of no more than 1.5 mm.

Claim 5

A heat sink fin according to Claim 4 wherein the heat dissipating plates are formed by means of a multi-wire saw.

Claim 6

A heat sink fin according to Claim 4 or 5 wherein the heat dissipating plates comprise end plates disposed at ends of the heat sink fin and inner plates disposed between the end plates and having a smaller thickness than the end plates.

Claim 7

A heat sink fin comprising a monolithic combination of a bottom plate and a plurality of heat dissipating pins arranged in an array and extending from the bottom plate, the heat dissipating pins each having planar dimensions of no more than 1 mm x 1 mm and being spaced apart by a gap of no more than 1.5 mm.

Claim 8

A heat sink fin according to Claim 7 wherein the heat dissipating pins are formed by means of a multi-wire saw.

Claim 9

A heat sink fin according to Claim 7 or 8 wherein the heat dissipating pins at the four corners and/or on the four sides are thicker than the other heat dissipating pins positioned inward.