Patent ID: 7880945

Claim:
A method for manufacturing a hologram projection screen to form a projected holographic image, comprising the steps of: dividing a laser beam into two paths by a beam divider, one path being used to obtain objective light of a hologram lens and the other path being used as a reference light, said objective light and said reference light converging onto a photoresist plate; focusing said objective light through said lens at a focal point O′, said lens being disposed at a focal length f′ from said focal point O′, positioning said photoresist material at a distance off from said focal point O′ such that a facula of said objective light passing through said lens onto said photoresist plate has a diameter of d, converging said reference light with said objective light onto said photoresist plate at an incident angle A from a direction that said objective light is incident on said photoresist plate, to thereby record a hologram lens having an aperture equal to said diameter d, a focal length equal to said distance f′ and a reproduced said angle of A, said hologram lens having a viewing field angle θ equal to said diameter d/said distance f′; opening and closing a shutter to control passage of said objective light and said reference light and exposure of the said photoresist material; controlling by computer the shutter opening and closing and movement of said photoresist plate by a distance of said hologram aperture, which is equal to said diameter d, to make said shutter opening and closing harmonize with the movement of said photoresist plate; repeating steps of: exposing one position of said photoresist plate, moving said photoresist plate and exposing another position of said photoresist plate, until information of a plurality of said hologram lenses is recorded as a hologram lens array onto said photoresist plate; metalizing said photoresist plate that has been exposed, to produce a nickel master of said hologram lens array through electroforming and recombining; using the above master nickel plate to emboss transparent or semi-transparent thermoplastic material, to form a screen body, on which a transparent or semi-transparent said hologram lens array is arranged, wherein each said hologram lens in said hologram lens array functions as a hologram lens pixel, and wherein each said hologram lens pixel displays images projected from a projector as holographic images diffracted to be viewed with a notable angle between a viewing position and a projection direction, wherein each said hologram lens pixel is not so configured as to correspond to each pixel in said projector or a preselected group of pixels in said projector, wherein said transparent or semi-transparent screen body provides an effect that said holographic images seem to be floating in the air.