Title: Achromatic illumination system for small targets

Abstract: A pair of light beams is directed to provide illumination that is substantially uniform from all directions on a small target by a system comprising a pair of corrector windows, a pair of planar reflecting surfaces, a pair of paraboloidal mirrors and a reflecting mirror cavity. The components are arranged so that each of the beams passes through a corrector and is reflected from the planar surface to the paraboloidal mirror, from which it is focused through a hole in the planar surface to the interior of the cavity. The surface of the interior portion of the cavity is shaped to reflect the focused beam three times before the focused reflected beam strikes the target.

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Inventors: Sigler, Robert D. (Ann Arbor, MI, US)

Application Number: 896540
Filing Date: 1978-04-14
Publication_date: 1979-01-30
Assignee: The United States of America as represented by the United States (Washington, DC)
Primary Class(es): 359/365 359/858, 362/259, 376/104
Other Classes:
US Patent Ref:

3001055	Sep, 1961	Lozier et al.	350/294.
3963328	Jun, 1976	Abel	350/294.
4017163	Apr, 1977	Glass	176/1.
4084887	Apr, 1978	Sigler	176/1.

Other Refs:
Primary Examiner: Behrend, Harvey E.
Assistant Examiner:
Attorney: Carlson; Dean E., Jackson; Frank H., Reynolds; Donald P.