Fingerprint and palmprint image collector with honeycomb structure, and terminal device
A fingerprint and palmprint image collector with a honeycomb structure and a terminal device are provided. The image collector includes a light guide plate, and a light source for emitting at least part of light into the light guide plate. A surface of the light guide plate is provided with a honeycomb plate. A plurality of vias parallel to each other are densely disposed on the honeycomb plate. The diameter of each via is in a range from 0.5 micrometer to 50 micrometers, and the size of an acquired fingerprint or palmprint is equal to the size of an acquired image. The thickness of the honeycomb plate is more than five times of the diameter of the via. The distance between centers of adjacent vias is less than or equal to 50.8 micrometers. The other surface of the honeycomb plate is provided with an image sensor. The image collector can be integrated into the terminal device. The fingerprint and palmprint image collector with the honeycomb structure according to the invention has a compact structure and a thin thickness, and can improve the contrast of the fingerprint image and the adaptive capacity for dry and wet fingers. The fingerprint and palmprint image collector is integrated into the terminal device so that the terminal device has a fingerprint and palmprint acquisition function through fewer additional component and low cost.
1. A fingerprint and palmprint image collector with a honeycomb structure, comprising:
a light guide plate and a light source for emitting at least part of light into the light guide plate, wherein a honeycomb plate is disposed at one surface of the light guide plate, a plurality of vias parallel to each other are densely disposed on the honeycomb plate, diameters of the plurality of vias are in a range from 0.5 micrometer to 50 micrometers, a size of an acquired fingerprint and palmprint is equal to a size of an acquired image, a thickness of the honeycomb plate is more than five times the diameters of the vias, a distance between centers of adjacent vias is less than or equal to 50.8 micrometers, and an image sensor is disposed on the other surface of the honeycomb plate,
wherein, the light source is fixed on the light guide plate through a support which is provided with a light guide groove, and the light source is disposed in the light guide groove, wherein the light guide groove is configured to control an angle between a normal line and light emitted into the light guide plate from the light source through the light guide groove to be in a range from arcsin(n 0 /n 2 ) to arcsin(n 1 /n 2 ), where n 0 refractive index of air, n 1 is a refractive index of liquid on a surface of an object contacting the light guide plate, and n 2 is a refractive index of the light guide plate.
2. The fingerprint and palmprint image collector with the honeycomb structure according to claim 1 , wherein, angles between central axes of the plurality of vias and a horizontal plane of the honeycomb plate are greater than or equal to 30 degrees and less than or equal to 90 degrees.
3. The fingerprint and palmprint image collector with the honeycomb structure according to claim 2 , wherein, the light source is disposed at a side and/or an upper surface and/or a lower surface of the light guide plate.
4. The fingerprint and palmprint image collector with the honeycomb structure according to claim 1 , wherein, a diffuse reflection layer is disposed on a surface of the honeycomb plate facing the light guide plate.
5. The fingerprint and palmprint image collector with the honeycomb structure according to claim 4 , wherein, the diffuse reflection layer is composed of a convex structure disposed between adjacent vias.
6. The fingerprint and palmprint image collector with the honeycomb structure according to claim 5 , wherein, the light guide plate and the honeycomb plate are disposed to be spaced apart from each other or connected to each other, and the honeycomb plate and the image sensor are disposed to be spaced apart from each other or connected to each other.
7. The fingerprint and palmprint image collector with the honeycomb structure according to any one of claims 1 to 6 , wherein, the honeycomb plate is replaced by an optical fiber plate which is composed of a plurality of optical fibers parallel to each other and disposed densely, wherein one end of the plurality of optical fibers is toward the light guide plate, and the other end of the plurality of optical fibers is toward the image sensor.
8. A terminal device, comprising: the fingerprint and palmprint image collector with the honeycomb structure according to any one of claims 1 to 6 .
9. A fingerprint and palmprint image collector with a honeycomb structure, comprising:
a light guide plate, a honeycomb plate and a light source for emitting at least part of light into the light guide plate, wherein the honeycomb plate is disposed below the light guide plate, a plurality of vias parallel to each other are disposed between an upper surface and a lower surface of the honeycomb plate, diameters of the plurality of vias are in a range from 0.5 micrometer to 50 micrometers, a thickness of the honeycomb plate is more than five times the diameters of the vias, and an image sensor is disposed on the lower surface of the honeycomb plate,
wherein, the light source is fixed on the light guide plate through a support which is provided with a light guide groove, and the light source is disposed in the light guide groove, wherein the light guide groove is configured to control an angle between a normal line and light emitted into the light guide plate from the light source through the light guide groove to be in a range from arcsin(n 0 /n 2 ) to arcsin(n 1 /n 2 ), where n 0 is a refractive index of air, n 1 is a refractive index of liquid on a surface of an object contacting the light guide plate, and n 2 is a refractive index of the light guide plate.
10. A terminal device, comprising: the fingerprint and palmprint image collector with the honeycomb structure according to claim 7 .