Anti-tamper mechanism and electronic device using the same

Patent metadata

Field	Value
Publication number	US-10664626-B2
Application number	US-201816221993-A
Country	US
Kind code	B2
Filing date	Dec 17, 2018
Priority date	Oct 22, 2018
Publication date	May 26, 2020
Grant date	May 26, 2020

Abstract

A mechanism to prevent unauthorized physical use of an electronic device includes a main circuit board, a plurality of light sources, a plurality of sensors, a base, a plurality of optical members, and a magnetic member. The base comprises a base body and a plurality of guiding members. Each optical member comprises a main body and a magnetic portion. The main body of each optical member can change either a direction of propagation of light or a wavelength of light emitted from a light source, or both, and can propagate such light to a sensor which can forward to a control unit electrical signals representing a password input. When the electronic device is detached, the magnetic member attracts the magnetized optical members into random disorder on the cover, thereby destroying the predefined order.

First claim

What is claimed is:

1. An anti-tamper mechanism adapted for an electronic device comprising a circuit board, a first housing, and a second housing, the circuit board being located between the first housing and the second housing, the anti-tamper mechanism comprising:
a main circuit board on the first housing and electrically connected to the circuit board;
a plurality of light sources on at least one side of the main circuit board and adjacent to a periphery of the main circuit board;
a plurality of sensors on the side of the main circuit board and adjacent to a periphery of the main circuit board;
a base comprising:
a base body on the main circuit board;
a plurality of guiding members on a side of the base body in an array, a plurality of interlaced light guiding passages being defined between the guiding members, and a plurality of receiving spaces being defined among four of the guiding members;

a plurality of optical members, each of the optical members comprising:
a main body;
a magnetic portion positioned on the main body and movably received in one of the receiving spaces;

a magnetic member positioned on the second housing and covering the guiding members;
wherein an end surface of the main body positioned away from the magnetic portion is non-planar, each of the optical members is received in one of the receiving spaces in a predefined order, the main body of each of the optical members is adapted for changing at least one of a propagating direction and a wavelength of light emitted from one of the light sources and propagating the light to at least one of the sensors, and the main circuit board sets an initial password according to electrical signals converted from light signals received by a sensor;
wherein when the electronic device is detached, the magnetic member attracts the magnet portions of the optical members to separate the magnet portions from the receiving spaces, and the optical members are scattered randomly on one side of the magnetic member by the attraction forces of the magnetic member and the magnet portion thereby destroying the predefined order.

2. The anti-tamper mechanism of claim 1 , wherein at least one guide groove is defined on the magnetic portion, each of the at least one guide groove penetrates opposite sides of the magnetic portion and is located at a corner of the magnetic portion, each of the at least one guide groove is slidably engaged to an edge of the guiding member.

3. The anti-tamper mechanism of claim 1 , wherein the magnetic portion is substantially a rectangular block.

4. The anti-tamper mechanism of claim 1 , wherein the anti-tamper mechanism further comprises a plurality of light guiding members, the light guiding members are spaced apart from each other on a periphery of the base body, an end of each of the light guiding members faces one of the light sources or one of the sensors, the other end of each of the light guiding members faces one of the light guiding passages.

5. The anti-tamper mechanism of claim 4 , wherein each of the plurality of light guides is substantially L-shaped.

6. The anti-tamper mechanism of claim 5 , wherein each of the light guiding members comprises a first light guiding portion, a light reflective surface, and a second light guiding portion, the first light guiding portion faces one of the light sources or one of the sensors, the light reflective surface is configured to reflect light transmitted by the light guiding member to change a propagating direction of the light, and the second light guiding portion faces the light guiding passage.

7. The anti-tamper mechanism of claim 1 , wherein the anti-tamper mechanism further comprises a cover, the cover is positioned on the guiding members and is in contact with a non-planar end surface of each of the optical members, and the magnetic member is located between the cover and the second housing.

8. The anti-tamper mechanism of claim 7 , wherein at least two hooks are positioned on the cover, each of the hooks is engaged to an edge of the main circuit board.

9. The anti-tamper mechanism of claim 1 , wherein the anti-tamper mechanism further comprises two adhesive members, one of the adhesive members is located between the main circuit board and the first housing to fasten the main circuit board to the first housing, another one of the adhesive members is located between the magnetic member and the second housing to fasten the magnetic member to the second housing.

10. The anti-tamper mechanism of claim 1 , wherein a reflective surface is defined on the main body, and the reflective surface is configured to change a propagating direction of light emitted from the light sources.

11. The anti-tamper mechanism of claim 1 , wherein the main body of each of the optical members has a preset and adjacently different color, and the main body of each of the optical members is translucent, the main body of each of the optical members is configured to change a wavelength of light emitted from the light sources, and the main body of each of the optical members propagates light emitted from one of the light sources to one of the sensors.

12. An electronic device, comprising:
a first housing;
a second housing connected to the first housing;
a circuit board located between the first housing and the second housing; and
an anti-tamper mechanism located between the first housing and the second housing, the anti-tamper mechanism comprising:
a main circuit board on the first housing and electrically connected to the circuit board;
a plurality of light sources on at least one side of the main circuit board and adjacent to a periphery of the main circuit board;
a plurality of sensors on the side of the main circuit board and adjacent to a periphery of the main circuit board;
a base comprising:
a base body on the main circuit board;
a plurality of guiding members on a side of the base body in an array, a plurality of interlaced light guiding passages being defined between the guiding members, and a plurality of receiving spaces being defined among four of guiding members;

a plurality of optical members, each of the optical members comprising:
a main body;
a magnetic portion positioned on an end of the main body and movably received in one of the receiving spaces;

a magnetic member positioned on the second housing and covering the guiding members;
wherein an end surface of the main body positioned away from the magnetic portion is non-planar, each of the optical members is received in one of the receiving spaces in a predefined order, the main body of each of the optical members is adapted for changing at least one of a propagating direction and a wavelength of light emitted from one of the light sources and propagating the light to at least one of the sensors, and the main circuit board sets an initial password according to electrical signals converted from light signals received by a sensor;
wherein when the electronic device is detached, the magnetic member attracts the magnet portions of the optical members to separate the magnet portions from the receiving spaces, and the optical members are scattered randomly on one side of the magnetic member by the attraction forces of the magnetic member and the magnet portion thereby destroying the predefined order.

13. The electronic device of claim 12 , wherein at least one guide groove is defined on the magnetic portion, each of the at least one guide groove penetrates opposite sides of the magnetic portion and is located at a corner of the magnetic portion, each of the at least one guide groove is slidably engaged to an edge of the guiding member.

14. The elec

Assignees

• Nanning Fugui Prec Ind Co Ltd

Inventors

• Tang xiao-hu
• Liu Pei

Classifications

• G02B6/0078

  Side-by-side arrangements, e.g. for large area displays · CPC title

• G06F21/86 Primary

  Secure or tamper-resistant housings · CPC title

• H05K5/03

  Covers · CPC title

• H05K5/0208 Primary

  Interlock mechanisms; Means for avoiding unauthorised use or function, e.g. tamperproof · CPC title

• G02B6/0046

  Tapered light guide, e.g. wedge-shaped light guide · CPC title