Means and method for producing image of papillary ridges

• US 3,138,059 A
• Filed: 05/21/1962
• Issued: 06/23/1964
• Est. Priority Date: 05/21/1962
• Status: Expired due to Term

• Current Assignee: Wyman White
• Original Assignee: Wyman White
• Inventors: WYMAN WHITE
• Application Number:
  US04/196,296
• Time in Patent Office: 764 Days
• US Class Current: 396/15
• CPC Class Codes: A61B 5/1172 using fingerprinting
• CPC Class Codes: G06V 40/1324 by using geometrical optics, e.g. using prisms G06V40/1312 takes precedence

Claims

1. A DEVICE FOR PRODUCING AN OPTICAL IMAGE OF PAPILLARY RIDGES COMPRISING:

A TRANSPARENT BODY HAVING FRONT AND REAR FACES, THE FRONT FACE HAVING A CONTACT AREA ADAPTED FOR BEING CONTACTED BY PIPILLARY RIDGES;

AN OPTICAL, ANTI-REFLECTIVE, TRANSPARENT COATING ON THE THE BODY REAR FACE;

A LIGHT SOURCE POSITIONED TO TRANSMIT LIGHT THROUGH THE REAR FACE AND COATING ONTO THE FRONT FACE AT AN ANGLE WHEREIN PART OF THE LIGHT IS INTERNALLY REFLECTED BY THE FRONT FACE, IN THE CONTACT AREA, THROUGH THE REAR FACE;

A SURFACE;

AND A LENS POSITIONED TO RECEIVE THE LIGHT INTERNALLY REFLECTED IN THE CONTACT AREA BY THE FRONT FACE AND TO FOCUS THE LIGHT ON THE SURFACE, WHEREBY LIGHT REFLECTION FROM THE TRANSPARENT BODY REAR FACE TO THE LENS IS LARGELY ELIMINATED BY THE COATING AND AN IMAGE OF PAPILLARY RIDGES, UPON THE SAME BEING PLACED IN CONTACT WITH THE FRONT FACE, APPEARS IN THE LIGHT INTERNALLY REFLECTED BY THE FRONT FACE AND FOCUSED BY THE LENS ON THE SURFACE.