Light guide for finger print reader
First Claim
1. An image capture apparatus, located in an environment medium, comprising:
- a light guide device, comprising;
a top surface;
a bottom surface, opposite to the top surface;
an light incident surface, connected between the top surface and the bottom surface, wherein an acute angle α
is included between the light incident surface and the top surface; and
a light emitting surface, opposite to the top surface, wherein the bottom surface is connected between the light incident surface and the light emitting surface;
a transparent device, disposed on the top surface of the light guide device;
a light source, used to emit a light beam, wherein the light beam passing through the light incident surface is transmitted toward the transparent device and totally reflected by an interface between the transparent device and the environment medium; and
an image capture device, disposed on the light emitting surface of the light guide device,wherein the acute angle α
satisfies a formula (2);
1 Assignment
0 Petitions
Accused Products
Abstract
An image capture apparatus including a light guide device, a transparent device, a light source and an image capture device is provided. The light guide device includes a top surface, a bottom surface opposite to the top surface, a light incident surface connected between the top surface and the bottom surface and a light emitting surface opposite to the top surface. The bottom surface is connected between the light incident surface and the light emitting surface. An acute angle α is included between the light incident surface and the top surface. The transparent device is disposed on the top surface of the light guide device. The light source is used to emit a light beam. The image capture device is disposed on the light emitting surface of the light guide device.
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Citations
12 Claims
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1. An image capture apparatus, located in an environment medium, comprising:
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a light guide device, comprising; a top surface; a bottom surface, opposite to the top surface; an light incident surface, connected between the top surface and the bottom surface, wherein an acute angle α
is included between the light incident surface and the top surface; anda light emitting surface, opposite to the top surface, wherein the bottom surface is connected between the light incident surface and the light emitting surface; a transparent device, disposed on the top surface of the light guide device; a light source, used to emit a light beam, wherein the light beam passing through the light incident surface is transmitted toward the transparent device and totally reflected by an interface between the transparent device and the environment medium; and an image capture device, disposed on the light emitting surface of the light guide device, wherein the acute angle α
satisfies a formula (2); - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An image capture apparatus, located in an environment medium, comprising:
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a light guide device, comprising; a top surface; a bottom surface, opposite to the top surface; a light incident surface, connected between the top surface and the bottom surface; and a light emitting surface, opposite to the top surface, wherein the bottom surface is connected between the light incident surface and the light emitting surface; a transparent device, disposed on the top surface of the light guide device; a light source, used to emit a light beam; an image capture device, disposed on the light emitting surface of the light guide device; a first reflection device, disposed on the top surface of the light guide device and located between the transparent device and the light guide device; and a second reflection device, disposed on the bottom surface of the light guide device, wherein the light beam passing through the light incident surface is sequentially reflected by the first reflection device and the second reflection device and expanded, the light beam reflected by the first reflection device and the second reflection device is totally reflected by an interface between the transparent device and the environment medium, and the image capture device is disposed more adjacently to the transparent device than the second reflection device. - View Dependent Claims (9, 10, 11, 12)
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Specification