Photodrafting equipment

Details Photodrafting equipment Photodrafting equipment

1977-09-26

1978-10-31

Griffin, Donald A.

G03B 4100

Patent

active

041237633

ABSTRACT:
Photodrafting equipment which can be operated alternatively in first and second modes. In the first mode, the equipment can expose continuous lines in conventional manner. In the second mode, the equipment can expose a plurality of discrete areas or "pads" without interruption of carriage movement. To this end the projection apparatus of the equipment comprises a relatively low intensity light source for exposing the lines, a relatively high intensity flash light source for exposing the pads, and a rotatable reflecting prism to select one or the other of the light sources in accordance with the mode of operation.

REFERENCES:
patent: 2063312 (1936-12-01), Hopkins
patent: 3610119 (1971-10-01), Gerber et al.
patent: 3648578 (1972-03-01), Ritchie
patent: 3673937 (1972-07-01), Mader
patent: 3722996 (1973-03-01), Fox
patent: 3903527 (1975-09-01), Frehling
patent: 3904291 (1975-09-01), Webster

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