Light guiding device and electronic device having light conducting channels with at least one barrier object therein
A security device in an electronic device which protects against unauthorized disassembly includes light sources, a plurality of photosensitive elements, a detection unit, a storage unit, a processor, and light guiding devices. Light conducting channels are provided between the light sources and the induction elements. Barrier objects that block light are installed at certain first light guiding channels of the light guiding channels, and are removed from the first light conducting channels when the electronic device is disassembled, so that induction signals output by the photosensitive elements are changed from the model or original digitally-recorded signals.
1. A light guiding device packaged between a printed circuit board (PCB) and a shell of an electronic device, the PCB including a light source and a plurality of photosensitive elements, the device comprising:
a plurality of light conducting channels corresponding to the photosensitive elements;
wherein the light conducting channels comprises a plurality of first light conducting channels including at least one barrier object therein, the photosensitive elements output different induction signals corresponding to the presence or absence of at least one barrier object in the light conducting channels; and
wherein the barrier objects are confined in their corresponding light conducting channels; wherein when the packaged electronic device is disassembled, the barrier objects are removed from their corresponding light conducting channels.
2. The light guiding device as claimed in claim 1 , further comprising:
a first substrate mounted in the PCB; and
a second substrate mounted on the first substrate, the PCB, or the combination thereof;
wherein the second substrate has an adsorption element; wherein the second substrate is mounted in the shell of the electronic device when the electronic device is packaged; wherein each of the light conducting channels is entirely or partly installed in the first substrate, each of the light conducting channels defines a light groove in the first substrate such that light passes through the light groove and the barrier objects are received in the light groove;
wherein when the electronic device is packaged, the second substrate is on the first substrate and the barrier objects are confined in the light groove; and
wherein when the electronic device is disassembled, the second substrate is removed from the first substrate with the shell of the electronic device, the adsorption element absorbs the barrier objects to the second substrate, and the barrier objects are removed from the light groove.
3. The light guiding device as claimed in claim 2 , wherein each of the light conducting channels comprises a second light conducting channel in the first substrate and a third light conducting channel in the second substrate.
4. The light guiding device as claimed in claim 2 , wherein the first substrate includes a first storage structure storing the light source, the first storage structure defines an opening facing towards the printed circuit board, and the first storage structure includes a chamfer at a top surface thereof to guide light from the light source into each of the light conducting channels.
5. The light guiding device as claimed in claim 2 , wherein a surface of the second substrate faces towards the first substrate, and the surface of the second substrate has a concavity towards the first substrate.
6. The light guiding device as claimed in claim 2 , wherein barrier objects are magnetic or metal spheres and the adsorption element is a magnetic object.
7. A electronic device comprising a printed circuit board (PCB), comprising:
a light source;
a plurality of photosensitive elements;
a detection unit, the detection unit detecting a plurality of induction signals of the photosensitive elements;
a storage unit, storage unit storing a plurality of model induction signals of the photosensitive elements when the electronic device is packaged;
a processing unit, processing unit comparing the induction signals detected and the model induction signals to determine whether the electronic device is disassembled; and
a light guiding device.
8. The electronic device as claimed in claim 7 , wherein the processing unit compares the induction signals detected and the model induction signals to determine whether the electronic device is disassembled without authorization when the electronic device is disassembled.
9. The electronic device as claimed in claim 7 , wherein the photosensitive elements are evenly distributed in a peripheral portion of the light source.
10. The electronic device as claimed in claim 7 , wherein the model induction signals are encrypted and stored in the storage unit.