Photocopying – Projection printing and copying cameras – With focusing or projection screen
Patent
1973-07-30
1976-10-05
Peters, Jr., Joseph F.
Photocopying
Projection printing and copying cameras
With focusing or projection screen
354 79, G03B 2732
Patent
active
039841863
ABSTRACT:
In the system disclosed, illuminating means form an optical path. An imaging system in the optical path includes a support for a mask, an imaging lens that focuses the image of the mask onto an optical plane, and a support that holds a component having a radiation-sensitive surface at the plane. A filter in the illuminating system blocks out light capable of affecting the radiation-sensitive material but allows passage of some visible light so that the image of the mask can be seen on the component. A half-mirror or beam splitter allows light from the imaging lens to focus on the component but deflects a portion of the light coming from the component toward an analyzer that detects the alignment between the image of the mask and the component. A second half-mirror or beam splitter near the first half-mirror compensates for radial shift of the image relative to the axis of the light path caused by the first half-mirror. The analyzer as well as the half-mirrors and the filter may be removed simultaneously after alignment to allow projection masking.
REFERENCES:
patent: 3012465 (1961-12-01), Goldberg
patent: 3205767 (1965-09-01), Weber et al.
patent: 3498705 (1970-03-01), Ooue et al.
patent: 3584949 (1971-06-01), Clow
patent: 3610750 (1971-10-01), Lewis
patent: 3617125 (1971-11-01), Sobottke
Momose Katsumi
Yamada Yu
Yoshinari Hideki
Canon Kabushiki Kaisha
O'Connor E. M.
Peters Jr. Joseph F.
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