1. A mirror, comprising:
a thin metal body having a curved specular surface;
a polymer layer on the specular surface;
a reflective metal layer on the polymer layer; and
a thin glass layer on the metal layer.
2. The mirror of claim 1, wherein the thin metal body is formed from an aluminum alloy.
3. The mirror of claim 1, wherein the thin metal body is formed from a sheet of an aluminum alloy or other metals such as magnesium, titanium or stainless steel.
4. The mirror of claim 1, wherein the curved specular surface is a concave surface.
5. The mirror of claim 4, wherein the concave surface is a substantially parabolic surface.
6. The mirror of claim 4, wherein the curved specular surface is a convex surface.
7. The mirror of claim 6, wherein the convex surface is a generally hyperbolic surface.
8. A mirror, comprising:
a metal body formed to be convex on one side and concave on an opposing side, the body having a specular surface on at least one side;
a polymer layer on the specular surface;
a reflective metal layer on the polymer layer; and
a thin glass layer on the metal layer.
9. The mirror of claim 8, wherein the body is formed from sheet aluminum alloy or other suitable metals such as magnesium, titanium or stainless steel.
10. The mirror of claim 9, wherein the sheet aluminum alloy comprises an age-hardenable aluminum alloy.
11. The mirror of claim 8, wherein the specular surface is disposed on the concave side of the body.
12. The mirror of claim 11, wherein the specular surface is a parabolic surface.
13. The mirror of claim 8, wherein the specular surface is disposed on the convex side of the body.
14. The mirror of claim 13, wherein the specular surface is a hyperbolic surface.
15. The mirror of claim 14, wherein the hyperbolic surface is configured to reflect and focus energy received by the hyperbolic surface onto an annular focus area.
16. A method of forming a mirror having a convex specular surface configured to focus light energy onto an annular area, comprising:
providing a hyperbolic curve formed symmetrically about an axis and having a concave side, a convex side, an imaginary focus point on the concave side and a real focus point on the convex side;
tilting the axis and the hyperbolic curve about the imaginary focus point, so that, when tilted, the axis is angularly displaced from its original position by an acute angle and the hyperbolic curve is tilted from its original position;
rotating the portion of the tilted hyperbolic curve that extends from the original axis to the tilted axis and beyond the tilted axis, about the original axis, so that the rotated portion of the tilted hyperbolic curve forms a surface of revolution about the original axis; and
providing the convex specular surface of the mirror with the shape of the surface of revolution so that the specular surface will have an annular focus.
17. The method of claim 16, wherein providing the convex specular surface comprises applying a polymer to the convex specular surface.
18. The method of claim 16, wherein providing the convex specular surface comprises depositing a metal reflective layer on the convex specular surface.
19. The method of claim 16, wherein providing the convex specular surface comprises depositing a glass protective layer on the convex specular surface.
20. A method of forming a concave mirror, comprising:
elevating a temperature of a sheet material to a predetermined temperature;
providing a die having a predetermined concave shape;
positioning the sheet material on the die; and
applying a gas at an elevated pressure to a side of the sheet opposite the concave shape to impress the sheet material into conformity with the predetermined concave shape.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A battery overheating protection device used in an electronic device, the electronic device comprising a main unit configured to implement basic functions of the electronic device and a battery unit configured to supply power to the main unit, the battery overheating protection device comprising:
a temperature monitoring unit configured to store a predetermined temperature value, measure a temperature value of the battery unit, and output a signal when the detected temperature value is greater than the predetermined temperature value, the temperature monitoring unit comprising at least one thermistor thermally connected to the battery unit;
a switch unit connected between the main unit and the battery unit; and
a processing unit configured to receive the signal and open the switch unit when receiving the signal, thereby the battery unit is disconnected from the main unit.
2. The device as claimed in claim 1, wherein the at least one thermistor is a negative temperature coefficient thermistor.
3. The device as claimed in claim 1, wherein the at least one thermistor comprises a plurality of thermistor cells connected in parallel, a thermal-sensitive resin and a housing, and the plurality of thermistor cells are packed by the thermal-sensitive resin, and the housing houses the thermal-sensitive resin.
4. The device as claimed in claim 3, wherein each thermistor cell comprises a thermistor body, two electrodes, and a base; the thermistor body is positioned on the base; and the two electrodes are attached to two sides of the thermistor body correspondingly.
5. The device as claimed in claim 4, wherein the base is made from glass-ceramic material.
6. The device as claimed in claim 3, wherein the housing is made from organic polymer plastic.
7. The device as claimed in claim 1, wherein the switch unit comprises a transistor.
8. The device as claimed in claim 1, wherein the at least one thermistor is thermally attached to a surface of the battery unit by a thermal adhesive.
9. An electronic device, comprising:
a main unit configured to implement basic functions of the electronic device;
a battery unit configured to supply power to the main unit; and
a battery overheating protection device, comprising:
a temperature monitoring unit configured to store a predetermined temperature value, measure a temperature value of the battery unit and output a signal when the detected temperature value is greater than the predetermined temperature value, the temperature monitoring unit comprising at least one thermistor thermally connected to the battery unit;
a switch unit connected between the main unit and the battery unit; and
a processing unit configured to receive the signal and open the switch unit when receiving the signal, thereby the battery unit is disconnected from the main unit.
10. The electronic device as claimed in claim 9, wherein the at least one thermistor is a negative temperature coefficient thermistor.
11. The electronic device as claimed in claim 9, wherein the at least one thermistor comprises a plurality of thermistor cells connected in parallel, a thermal-sensitive resin and a housing, and the plurality of thermistor cells are packed by the thermal-sensitive resin, and the housing houses the thermal-sensitive resin.
12. The electronic device as claimed in claim 11, wherein the thermistor cell comprises a thermistor body, two electrodes, and a base; the thermistor body is positioned on the base; and the two electrodes are attached to two respective sides of the thermistor body.
13. The electronic device as claimed in claim 9, wherein the battery unit comprises a plurality of batteries, the temperature monitoring unit comprises a plurality of thermistors, and each thermistor is thermally attached to a surface of each battery by a thermal adhesive.
14. The electronic device as claimed in claim 9, wherein the electronic device is a cellular phone.
15. The electronic device as claimed in claim 9, wherein the electronic device is a portable gaming device.