Title: Head-up display units and optical devices

Abstract: A head-up display unit for use for example in an aircraft has (a) a porthole part of a source of collimated luminous signals disposed directly in the field of view of an observer when looking at a scene ahead of him from an observation position thus obscuring part of his view and (b) a combining optical system disposed adjacent the porthole part and having plane optical surfaces which transmit to the observer's eyes light from the porthole directly, and light from the scene ahead by reflection, whereby the observer sees in superposed relationship the scene ahead and a display of collimated luminous signals. In a preferred arrangement the plane optical faces are constituted by plane boundary faces of prisms cemented together to form a stable assembly.

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Inventors: Ellis, Stafford Malcolm

Application Number: 475107
Filing Date: 1974-05-31
Publication_date: 1976-02-03
Assignee:
Primary Class(es): 359/630 340/971, 340/980, 348/832, 353/12, 359/834
Other Classes:
US Patent Ref:

3737212	Jun, 1973	Antonson et al.	350/174.
3814496	Jun, 1974	Mukai	350/287.

Other Refs:
Primary Examiner: Grimm, Siegfried H.
Assistant Examiner:
Attorney: Brisebois & Kruger