Hybrid optical barrel

Details Hybrid optical barrel Hybrid optical barrel

1998-11-03

2000-09-12

Ben, Loha

Optical: systems and elements

Lens

With support

359819, 359826, G02B 702

Patent

active

06118599&

ABSTRACT:
A hybrid optical barrel as a projection optical unit includes a plurality of cell groups disposed in series along an optical axis, each cell group including at least a cell unit and each cell unit including a lens and a cell holding the lens. The optical barrel also includes a connecting barrel member carrying the plurality of cell groups, the connecting barrel member being made of a material with a CTE<3.0 ppm.degree.C. such as Invar, Ultra Low Expansion.TM. glass, Zerodur glass, or silicon carbide. The connecting barrel member may comprise a plurality of sub-barrels disposed in series along the optical axis. Alternatively, the connecting barrel member may comprise a plurality of spacing members. Therefore, during an axial displacement of the optical barrel caused by a temperature change, relative axial dimensions of the sub-barrels or the spacing members remain substantially constant, thereby reducing an overall displacement of the lenses within the plurality of cell groups.

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