Apparatus for reading and electrophotographically reproducing microphotographs of varying sizes

Claim 2

Apparatus for reading and reproducing microphotographs of varying sizes comprising a source of light including a source of electricity, lamp means, controlled rectifier means connected in series with said source of electricity and said lamp means, and adjustable means connected with said controlled rectifier means and said source of electricity to control the operation of said controlled rectifier means whereby light intensity from said lamp means may be controlled in accordance with the size of a microphotograph to be reproduced; mounting means for holding a microphotograph to receive light from said source; a projection system for selectively projecting light from the microphotograph to a viewing screen or an exposure zone; electrophotographic reproducing means disposed at said exposure zone to electrophotographically produce a copy of the microphotograph; and a condenser assembly for concentrating light from said source on the microphotograph.

Claim 3

The apparatus as recited in claim 1 wherein said condenser assembly includes a pair of spaced stationary lenses and a plurality of movable lenses supported in a holder to be individually positioned between said stationary lenses, each of said movable lenses being operative to concentrate light on microphotographs of different sizes.

Claim 4

The apparatus as recited in claim 1 wherein said controlled rectifier means includes a triac having a gate electrode and said timing means includes capacitor means connected in series with adjustable resistor means and a diac connected in series between said gate electrode and the junction between said capacitor means and said resistor means.

Claim 5

The apparatus as recited in claim 1 wherein said electrophotographic reproducing means includes means for supplying electrophotographic paper, cutting means for cutting said electrophotographic paper to predetermined lengths, means for charging the paper, means for holding the charged paper in a position to be exposed to light from said projection system to selectively discharge said charged paper to form a latent image thereon, means for developing said latent image by applying toner thereto, and time control means connected to control said paper supply means, said cutting means, said charging means, said holding means and said developing means to operate for a constant time period regardless of the size of the microphotograph to be reproduced.

Claim 6

The apparatus as recited in claim 4 wherein said projection system includes a shutter mirror pivotable between a first position reflecting light to said viewing screen and a second position out of the light path to provide light at the exposure zone, said shutter mirror being controlled by said time control means.

Claim 7

Apparatus for reproducing microphotographs of varying sizes comprising a source of light; mounting means for holding a microphotograph to receive light from said source; a condenser assembly for concentrating light from said source on the microphotograph and including a plurality of lenses each being operative to concentrate light on a microphotograph of a different size; a projection system for projecting light from the microphotograph to an exposure zone to expose an electrophotographic element and including an objective selected in accordance with the size of the microphotograph to be reproduced; and electrophotographic reproducing means disposed at said exposure zone to electrophotographically prodUce a copy of the microphotograph including time control means for exposing the electrophotographic element to light from said projection system for a constant period of time regardless of the size of the microphotograph to be reproduced whereby microphotographs of differing sizes may be reproduced with a constant exposure time by utilizing a predetermined objective and condenser lens.

Claim 8

Apparatus for reproducing microphotographs of varying sizes comprising a source of light; mounting means for holding a microphotograph to receive light from said source; a condenser assembly for concentrating light from said source on the microphotograph and including a plurality of lenses each being operative to concentrate light on a microphotograph of a different size; a projection system for projecting light from the microphotograph to an exposure zone to expose an electrophotographic element and including an objective selected in accordance with the size of the microphotograph to be reproduced; and electrophotographic reproducing means disposed at said exposure zone to electrophotographically prodUce a copy of the microphotograph including time control means for exposing the electrophotographic element to light from said projection system for a constant period of time regardless of the size of the microphotograph to be reproduced whereby microphotographs of differing sizes may be reproduced with a constant exposure time by utilizing a predetermined objective and condenser lens.

Claim 9

The apparatus as recited in claim 5 wherein said electrophotographic reproducing means includes means for supplying electrophotographic paper, means for cutting said electrophotographic paper to predetermined lengths, means for charging the paper, means for holding the charged paper in a position at said exposure zone to be exposed to light from said projection system to selectively discharge said charged paper to form a latent image thereon, and means for developing said latent image by applying toner thereto, said time control means being connected to control said paper supply means, said cutting means, said charging means, said holding means and said developing means to operate for a constant time period regardless of the size of the microphotograph to be reproduced.