Optical system moving frame unit for use in an exposure device o

Details Optical system moving frame unit for use in an exposure device o Optical system moving frame unit for use in an exposure device o

1993-03-15

1994-02-01

Grimley, A. T.

Photocopying

Contact printing

Light boxes

248638, 248903, 355236, G03G 1528

Patent

active

052836142

ABSTRACT:
An optical system moving frame unit to be used in an optical system movement type exposure device, which is cast into a rectangular frame reinforced with reinforcing ribs and thin planar members. The reinforcing ribs are arranged as in a trussed structure. The thin planar members cover the spaces defined by the frame and the reinforcing ribs in such a manner as to be integrated with the frame and the reinforcing ribs. The provision of the thin planar members eliminates the problem that the casting material does not flow smoothly into the cavities for the reinforcing ribs in a casting process of the optical system moving frame unit.

REFERENCES:
patent: 4409771 (1983-10-01), Lowe
patent: 4728988 (1988-03-01), Tsutsui et al.
patent: 4931836 (1990-06-01), Matsushita et al.
patent: 5072570 (1991-12-01), Johnson

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