公开(公告)号：US3917378A

公开(公告)日：1975-11-04

申请号：US46921874

申请日：1974-05-13

Applicant: RCA CORP

Inventor： GALE MICHAEL THOMAS

IPC: G02B5/18 ,  G03H1/26 ,  G03H1/28 ,  G03H1/02

CPC classification number: G03H1/26 ,  G02B5/1842

Abstract: A hologram comprising three superimposed parallel diffraction gratings, each modulated by a different primary color component of an imaged object and having a different spatial frequency related to that component, is embossed in a suitable record such that at least one of the gratings is rotated with respect to the other two. The coarsest beat frequency in ''''multi-color'''' areas of the hologram is thereby increased over that for a hologram comprising mutually-parallel gratings, whereby the resolution of the hologram-as observed in a focussed image hologram projectoris similarly increased.

Abstract translation: 包括三个叠加的平行衍射光栅的全息图，其每一个由成像对象的不同原色分量调制并具有与该分量相关的不同的空间频率，被压印在合适的记录中，使得至少一个光栅相对于 到另外两个。 因此，全息图的“多色”区域中的最粗糙的拍频，比包括相互平行的光栅的全息图的频率更高，由此在聚焦图像全息投影仪中观察到的全息图的分辨率也同样增加。

公开(公告)号：US3924925A

公开(公告)日：1975-12-09

申请号：US46921974

申请日：1974-05-13

Applicant: RCA CORP

Inventor： GALE MICHAEL THOMAS ,  GREENAWAY DAVID

IPC: G03H1/22 ,  G02B5/18 ,  G03H1/04 ,  G03H1/26 ,  G03H1/28 ,  G03H1/24

CPC classification number: G03H1/0406 ,  G02B5/1842 ,  G03H1/0236 ,  G03H1/0244 ,  G03H1/2249 ,  G03H1/2286 ,  G03H2001/2223 ,  G03H2001/2263 ,  G03H2210/13 ,  G03H2210/20 ,  G03H2222/18 ,  G03H2260/14

Abstract: A filamentary light source and condenser system provide one or more light beams for illuminating a frequency-encoded focussed image hologram, the light diffracted therefrom being decoded by a slit-type spatial filter and projected onto a viewing screen to display a full color reconstruction.