Multiply recorded hologram for security

Details Multiply recorded hologram for security Multiply recorded hologram for security

1993-01-08

1994-06-07

Lerner, Martin

Optical: systems and elements

Holographic system or element

Authentication

283 86, 283904, 356 71, 359 24, G03H 128, G06K 710

Patent

active

053194764

ABSTRACT:
A hologram containing information recorded such a manner that it is difficult to read. A Lippmann hologram (10) contains photoelectrically readable information (13) recorded so as to be reconstructible only with a specific invisible wavelength (6) in the infrared or ultraviolet region. It is difficult to read the information recorded on the hologram unless information about the wavelength of diffracted light (14) for reconstruction is given. The hologram is also difficult to forge and hence suitable for security purposes.

REFERENCES:
patent: 3643216 (1972-02-01), Greenaway et al.
patent: 4120559 (1978-10-01), Abramson et al.
patent: 4171766 (1979-10-01), Ruell
patent: 4235505 (1980-11-01), Hariharan et al.
patent: 4250393 (1981-02-01), Greenaway
patent: 4501439 (1985-02-01), Antes
patent: 4524276 (1985-06-01), Ohtombe
patent: 4563024 (1986-01-01), Blyth
patent: 4820006 (1989-04-01), Constant
patent: 5128780 (1992-07-01), Smith

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