High contrast, low distortion optical acquisition system for image capturing
First Claim
1. An apparatus for forming a high contrast image of a patterned object comprising:
- a first lens including;
an imaging surface against which a patterned object to be imaged is to be placed;
at least one light receiving surface adjacent to the imaging surface and through which light enters the first lens; and
a viewing surface opposite to the light entrance surface and through which an image of the patterned object to be imaged is projected;
a second lens adjacent to the viewing surface and for receiving and focusing an image of the patterned object projected through the viewing surface; and
at least one light source for projecting incident light into the first lens and located adjacent to the light entrance surface to project incident light between the viewing surface and the imaging surface wherein the incident light can undergo total internal reflection between the imaging surface and the viewing surface without passing through the viewing surface such that the image of the patterned object is generated by substantially all scattered light from the imaging surface.
1 Assignment
0 Petitions
Accused Products
Abstract
An apparatus and method for acquiring an image of a patterned object such as a fingerprint including a light refracting device, a focusing lens, and a light source. The light refracting device can, for example, be a prism and includes an imaging surface, a light receiving surface and a viewing surface. Incident light from the light source is projected through the light receiving surface and reflected off a surface other than the imaging surface. This reflected light is then projected onto the imaging surface to create an image of the patterned object from substantially all scattered light through the viewing surface. The lens is placed adjacent to the viewing surface to focus the light on an image sensor.
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Citations
8 Claims
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1. An apparatus for forming a high contrast image of a patterned object comprising:
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a first lens including;
an imaging surface against which a patterned object to be imaged is to be placed;
at least one light receiving surface adjacent to the imaging surface and through which light enters the first lens; and
a viewing surface opposite to the light entrance surface and through which an image of the patterned object to be imaged is projected;
a second lens adjacent to the viewing surface and for receiving and focusing an image of the patterned object projected through the viewing surface; and
at least one light source for projecting incident light into the first lens and located adjacent to the light entrance surface to project incident light between the viewing surface and the imaging surface wherein the incident light can undergo total internal reflection between the imaging surface and the viewing surface without passing through the viewing surface such that the image of the patterned object is generated by substantially all scattered light from the imaging surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification