Patent ID: 7987899

Claim:
A micro-structured cooler ( 3 ) for an item ( 4 ) to be cooled, comprising a. a stack of at least two metal foils ( 1 ), said foils having channels ( 2 ) for coolant, and of one base plate ( 5 ) adapted to be brought into thermal contact with said item ( 4 ) through a thermal contact surface ( 6 ), said metal foils ( 1 ) and said base plate ( 5 ) being joined together so as to form a single piece of material, said channels ( 2 ) having a width b ranging from 100 to 350 μm, a depth t ranging from 30 to 150 pm, a mean spacing s ranging from 30 to 300 μm, a residual foil thickness r remaining after formation of said channels ( 2 ) in said metal foils ( 1 ) ranging from 30 to 300 pm and said base plate ( 5 ) having a thickness g ranging from 100 to 1,000 μm, b. at least one splitting chamber ( 10 ) traversing said metal foils ( 1 ) approximately in the region of said thermal contact surface ( 6 ), said chamber communicating with a respective inlet-side end of all or of selected channels ( 2 ) through channel inlet ports, c. at least one inlet chamber ( 20 ) for admission of coolant into said cooler ( 3 ), said chamber communicating with said at least one splitting chamber ( 10 ), d. at least one collecting chamber ( 11 ) traversing the metal foils ( 1 ) and communicating with a respective outlet-side end of all or selected channels ( 2 ) through channel outlet ports and a at least one outlet chamber ( 21 ) for discharging coolant from said cooler ( 3 ), said chamber communicating with said at least one collecting chamber ( 11 ), characterized in that the cross sectional area of the channels ( 2 ) in a channel layer adjacent said base plate ( 5 ) is greater than the cross sectional area of the channels ( 2 ) in a channel layer located in the stack on the side opposite said base plate ( 5 ).