Copying machine

Claim 1

A copying machine, for use in making copies of an original by exposing the original to light through an intermediate sheet in pressure contact with the original and subsequently heating in a heating step the exposed intermediate sheet in pressure contact with a copy sheet comprising, in combination, a translucent exposure surface having outer edges and adapted to receive said intermediate sheet and original superimposed, a light reflecting chamber disposed below said exposure surface and including a first set of side wall eLements, each element of said first set sloping inwardly from an outer edge of said exposure surface terminating in a common plane below said exposure surface, and a second set of side wall elements remote from said exposure surface each element of said second set sloping inwardly from the juncture between an element of said first set and said common plane at an angle different from that of said first set the inner surface of all said elements being reflective,, a light source arranged in said reflecting chamber in such a manner that the first set of side wall surfaces reinforces the light, emanating from said source, at the marginal area of said exposure surface and the second set of side wall surfaces reinforces the light near the central area of said exposure surface, and heat generating means adapted for the heating step, disposed near a side wall of said reflecting chamber.