Phase reticle design

• US 3,876,304 A
• Filed: 09/06/1973
• Issued: 04/08/1975
• Est. Priority Date: 09/06/1973
• Status: Expired due to Term

• Current Assignee: Frank A. Novak
• Original Assignee: Frank A. Novak
• Inventors: Novak, Frank A.
• Primary Examiner(s): Wibert, Ronald L.
• Assistant Examiner(s): Godwin, Paul K.
• Application Number:
  US05/394,863
• Time in Patent Office: 579 Days
• Field of Search: 356/71,239,69 250/556,557,237G,237 350/205,162SF
• US Class Current: 356/71
• CPC Class Codes: G07D 7/12 Visible light, infrared or ultraviolet radiation

Abstract

Disclosed is a reticle assembly readily adaptable for use in radiation sensitive paper security validation apparatus. A transparent lens containing thereon a plurality of evenly spaced parallel reticle lines comprises the assembly. The reticle lines are of such a nature that when the reticle assembly and the paper security to be validated are placed in close operative positional relationship the reticle lines diagonally transverse the lines of the cross-hatched grid pattern contained on the paper security being validated.

Claims

1. A reticle assembly to be placed in close positional relationship with a cross-hatched pattern created by the intersection of two sets of lines on a material to be authenticated such that relative positional changes between the reticle and the cross-hatched pattern result in fluctuations in the amount of light passing therethrough, comprising:

a substantially transparent window; and

a plurality of apertures positioned upon the window in spaced relationship according to the spacing of diagonals through the intersection of the two sets of lines forming the cross-hatched pattern such that when the reticle is operationally positioned with respect to the crosshatched pattern the apertures of the reticle pass transversely to the two sets of lines thereof.

2. The reticle assembly as recited in claim 1 wherein the plurality of apertures positioned upon the window are parallel with respect to each other.

3. The reticle assemble as recited in claim 1 wherein the plurality of apertures positioned upon the lens are equally spaced upon the lens with respect to each other.

4. The reticle assembly as recited in claim 1 wherein the plurality of apertures positioned upon the window are, when the reticle is in operative positional relationship with the cross-hatched pattern, diagonally transverse to the intersection points of the two sets of lines of the cross-hatched pattern.

5. The reticle assembly as recited in claim 4 wherein the plurality of apertures positioned upon the window are equally spaced with relation to each other such that each intersection point of the cross-hatched pattern directly opposite the reticle is transversed by one of the lines on the window.

6. A reticle assembly to be placed in close positional relationship with a multi-lined grid pattern to determine the validity of the pattern, comprising a transparent window and a plurality of reticle elements upon the window of such a nature that when the reticle assembly is operatively within a close positional relationship with the grid pattern the reticle elements are obliquely angled with respect to the lines of the pattern.

7. The reticle assembly as recited in claim 6 wherein the portion of the window not containing the plurality of reticle elements is masked.

8. The reticle assembly as recited in claim 6 wherein the reticle elements are so angled that when the reticle assembly is operatively positioned with respect to the grid pattern the reticle elements diagonally transverse the points of intersection of the lines of the pattern.

9. The reticle assembly as recited in claim 6 wherein the reticle elements comprise a plurality of evenly spaced parallel apertures.