The Projector of Holopanoragrammes
for an optimal restitution in full light
without awkward reflections

Unless using a source of light optically similar to the sun, a deep holographic image cannot be observed using the indirect ambient light like a photograph.
It is mainly the reason for which the holography of high optical quality does not follow the same development of photography.

Presentation in very attended pedestrian spaces request of course a transparent protection of the holographic support. However, a glazing of protection increases the intensity of the parasitic reflections of the ambient light which make already painful the observation of the image holographic exposed in normally lit places and in which the intensity of the ambient light cannot be controlled at will.

Not to limit the vision of the hologram of night or in obscure rooms, the solution consists in substituting the reflection of the ambient light on surfaces of the holographic support and its protection by the reflection of a black screen, as on the dashboards of the cars with a tilted pane.
This anti-reflecting device functioning as a trap with light directs the undesirable luminous rays in direction of this absorbing screen.
It then has the advantage of optimizing the intensity and the punctuality of the source of light for the clear restitution, in full light, of a deep luminous volume of a holographic image.

A modification of the holographic support is then necessary for the use under a great angle of this anti-reflecting device.
The following figures represent two combinations in space between a concave holographic support (H) restoring under a great angle a real image (M) using a point source (S), and a anti-reflective screen (E) absorbing the ambient light (L).

Because of the verticality of the right-hand sides of the surface of the holographic support (H, here cylindrical), an absorbing screen (E) must be in front of the opening of this support, so that an observer (D) located in the zone of observation between this black screen and the real image (M) is not obstructed by the reflections of the ambient light (L). However, the screen absorbing embarrassment observation of the real image by observers (A, B and C) located apart from this zone.

The backward tilt of all the lines of the conical surface of the holographic support (H), without any slope of the relief of the real image (M) thanks to a suitable holographic recording, makes it possible to leave the black screen (E) to horizontal to the top and apart from all the large horizontal field of vision. What has the advantage henceforth of making possible of the observations by far, of face and side, without the observers of different sizes being obstructed by the absorbing screen eliminating the parasitic reflections on all the great angle from vision of 180°.

This is why the opening of Holopanoragramme is in the shape of trapezoid with the curve in hemicycle of the holographic support, this for an observation without sorrow of the real image presented in luminous spaces, whatever the intensity of this ambient light.
The concave support and its protection remain not easily detectable then in luminous holographic volume and without reflections of daylight.

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