Press sheet for fingerprint reader and fingerprint reader

• US 10,061,964 B2
• Filed: 08/10/2015
• Issued: 08/28/2018
• Est. Priority Date: 10/23/2014
• Status: Active Grant

• Current Assignee: Gingy Technology Inc., Gingytech Technology Inc., Industrial Technology Research Institute
• Original Assignee: Gingy Technology Inc., Industrial Technology Research Institute
• Inventors: Huang, Hsiao-Feng, Chen, Ping-Chen, Chiang, Chun-Chen, Chien, Pei-Chi, Wu, Jen-Chieh
• Primary Examiner(s): Werner, Brian P
• Application Number:
  US14/822,891
• Publication Number:
  US 20160117543A1
• Time in Patent Office: 1,114 Days
• CPC Class Codes: G02B 1/14 Protective coatings, e.g. hard coatings
• CPC Class Codes: G02B 5/0231 the surface having microprismatic or micropyramidal shape macroscopic prism arrays G02B5/045
• CPC Class Codes: G02B 5/0242 by means of dispersed particles
• CPC Class Codes: G02B 5/0278 used in transmission
• CPC Class Codes: G06V 40/1318 using electro-optical elements or layers, e.g. electroluminescent sensing

Abstract

A press sheet for fingerprint reader and a fingerprint reader are provided. The press sheet includes a transparent substrate, a microstructure layer, and a diffusion layer. The transparent substrate has a first surface and a second surface, and the first surface faces towards an optical imaging apparatus. The microstructure layer is disposed on the first surface of the transparent substrate, and the diffusion layer contains diffusion particles.

Claims

1. A press sheet for fingerprint reader, comprising:

a transparent substrate having a first surface and a second surface,

a microstructure layer disposed on the first surface of the transparent substrate; and

a diffusion layer disposed on the second surface of the transparent substrate, wherein the diffusion layer has a thickness of 1 μ

m to 80 μ

m, the first surface faces an optical imaging apparatus, and the diffusion layer comprises a plurality of diffusion particles and resin, wherein

the resin and the diffusion particles have a refractive index difference of 0.01 to 1.5, and the diffusion particle has a particle size of 0.01 μ

m to 30.0 μ

m.

2. The press sheet for fingerprint reader of claim 1, wherein the resin comprises acrylic, epoxy resin, polyester, polyurethane (PU), PUacrylic, polysiloxane or a combination thereof.

3. The press sheet for fingerprint reader of claim 2, wherein the diffusion particles and the resin have a weight ratio of 0.01 to 2.0.

4. The press sheet for fingerprint reader of claim 1, wherein the diffusion particles comprise polystyrene, poly methyl acrylate, methyl methacrylate and styrene copolymer, polycarbonate, polyethylene, silicone resins, calcium carbonate, silica, titanium dioxide, or a combination thereof.

5. The press sheet for fingerprint reader of claim 1, wherein the transparent substrate comprises polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), or cellulose triacetate (TAC).

6. The press sheet for fingerprint reader of claim 1, wherein the microstructure layer comprises at least one shape of prismatic (prism), lenticular lens (lenticular), semi-circular dome, pyramid, cylinder or regular polygonal.

7. The press sheet for fingerprint reader of claim 6, wherein the microstructure has at least an arrangement of random or period.

8. The press sheet for fingerprint reader of claim 1, wherein the transparent substrate and the microstructure layer are integrated.

9. The press sheet for fingerprint reader of claim 1, further comprises a protection layer disposed on the diffusion layer.

10. The press sheet for fingerprint reader of claim 9, wherein the protection layer comprises a hard coating.

11. A fingerprint reader, comprising:

a press sheet for fingerprint reader of claim 1; and

at least an optical imaging apparatus arranged towards to the press sheet.

12. The fingerprint reader of claim 11, wherein the optical imaging apparatus comprises a light source and optic camera lens.