0408344-A2 is referenced by 53 patents and cites 3 patents.

There is disclosed two helmet systems, each comprising a helmet (11) and, carried by the helmet (11), an optical arrangement (13). In each system, the optical arrangement (13) both provides a collimated display superimposed on the helmet wearer's view of the forward scene through an eyeplece (15 or 50) of the arrangement (13), and senses the angular position of that eye of the helmet wearer looking through the eyepiece (15 or 50) with respect to helmet axes.; The optical arrangement (13) senses such angular position by sensing the position, within a sensing area of a sensor (37 or 72), of the point focus of infra-red radiation, from an infra-red point source (35 or 71A), reflected by the eye, and producing an electrical output representative of this position. in one helmet system the eyepiece (15) is of the open optics type and in the other the eyepiece (50) is of the solid optics type.

Title
Helmet systems.
Application Number
EP19900307597 19900711
Publication Number
0408344 (A2)
Application Date
July 11, 1990
Publication Date
January 16, 1991
Inventor
Staveley Christopher Barry
GB
Assignee
Marconi Gec
GB
IPC
G05D 03/10
G02B 27/00
F41G 03/00
A42B 03/00
G02B 27/02
G02B 27/01
F41G 03/00
B64D 45/00
A42B 03/04
G02B 27/02
G02B 27/01
F41G 03/22
B64D 45/08
A42B 03/04
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