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Display device with a dissociable structure, particularly for aircraft
| Details |
Inventors: Fagard, Pierre;
Assignee: Societe Francaise d'Equipements pour la Navigation Aerienne (S.F.E.N.A) (FR)
Primary Examiner: Corbin; John K.
Assistant Examiner: Ryan; Jay Patrick
Attorney, Agent or Firm: Drucker; William A.
The invention provides a display device with dissociable structure, making t possible for a user to observe a synthetic light image superimposed in his natural field of vision, said device being formed as two dissociable modules, namely: an image generating module having, inside a case, at least one part of the image generating members and a removable optical module including a support element to which is fixed a curved mixer type optical mount including, in a dihedral configuration, a flat semitransparent mirror and a curved semitransparent mirror. |
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DETAILED DESCRIPTION The invention overcomes these drawbacks by providing a display device of the above defined type but made in the form of two dissociable modules, namely: an image generating module including at least one part of said image generating means, this module having means for permanently fixing it to the vehicle, and a removable optical module including at least one semireflecting element which extends into the field of vision external to the user, this optical module being couplable to the image generating module and being fixed by means of easily connectable and disconnectable rapid locking means.
Thus, with the dissociable structure described above it becomes possible, when the display device is not in use, to remove the optical module which forms the bulkiest part.
There only then remains the symbol generating module which, because of its small dimensions, is less troublesome for the user.
More precisely, the symbol generating module may include a case containing the usual optical or opto-electronic members for generating the light symbols which it is desired to superimpose on the vision of the user, this case having one coupling face with an orifice closed by an optically transparent element, through which light rays emitted by the symbol generator pass.
In this case, the optical module includes a support element on which said semireflecting element is fixed, this support being provided with centering and locking elements making possible the rapid and readily disconnectable fixing thereof to the coupling face of the case.
Advantageously, the rapid locking means may be formed by a bayonet coupling.
In this case, one of the two modules may include at least one bayonet, whilst the other module will include at least one substantially circular ramp on which said bayonet may abut.
The invention may further include a protection and handling holder in which the optical module may be housed when the display device is not used, this holder being shaped so as to allow coupling to or uncoupling of the optical module in contains from an image generating module
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Optical Systems 
