Key and lock set

1. A key and lock set for a vehicle, comprising:

an electronic key without a built-in a power source;

a lock openable by the electronic key but not openable by a mechanic key, having a power source shared with the electronic key; and

an electronic key reader configured to read an identification of the electronic key wherein:

the lock is configured to be opened by the electronic key upon the identification matches an identification of the lock;

the identification of the electronic key and the identification of the lock are programmable and configured to be paired;

the key and lock set is configured for a door;

the key and lock set further comprises a keyboard mounted outside the door configured to access the lock by accessing from outside the door;

the keyboard is not removable from outside the door; and

the keyboard is removable from inside the door through a mounting fastener or a cover;

and further wherein the keyboard comprises a plurality of buttons;

each of the plurality of buttons having a light emitter and a light receiver adjacent to each other,

wherein inside each of the light emitter and the light receiver, a lens or aperture is disposed adjacent to a light-emitting surface or a photosensitive surface, to reduce a light emission angle or a light receiving angle; and

wherein upon the plurality of buttons being pointed to by a pointing object, a reflection of the pointing object causes light emitted from the light emitter to enter into the light receiver.

2. The key and lock set of claim 1 , wherein:

the door is a vehicle or building door; and

the keyboard is mounted on the vehicle or the building.

3. The key and lock set of claim 2 , wherein the keyboard is mounted outside the vehicle or the building at an area other than the door.

4. The key and lock set of claim 2 , wherein the keyboard is mounted outside the vehicle or the building at an area on the door.

5. A key and lock, comprising:

an electronic key without a built-in a power source;

a lock openable by the electronic key but not openable by a mechanic key, having a power source shared with the electronic key; and

an electronic key reader configured to read an identification of the electronic key;

wherein:

the lock is configured to be opened by the electronic key upon the identification matches an identification of the lock;

the identification of the electronic key and the identification of the lock are programmable and configured to be paired;

the key and lock set further comprises an optical electronic passcode input keypad configured to unlock the lock, wherein:

the keypad comprises a plurality of buttons;

each of the plurality of buttons has a light emitter and a light receiver adjacent to each other;

inside each of the light emitter and the light receiver, a lens or aperture is disposed adjacent to a light-emitting surface or a photosensitive surface, to reduce a light emission angle or a light receiving angle; and

upon the plurality of buttons being pointed to by a pointing object, a reflection of the pointing object causes light emitted from the light emitter to enter into the light receiver.

6. The key and lock set of claim 5 , wherein:

the keypad further comprises a band-pass filter disposed adjacent to the photosensitive surface and configured to block ambient light with wavelengths different from wavelengths of the light from the light emitter;

the light from the light emitter is high-frequency pulse light;

the light receiver is configured to receive the high-frequency pulse light while filtering out the ambient light;

the light emitter comprises a light-emitting diode (LED); and

the light receiver comprises a photodiode or a phototransistor.

7. The key and lock set of claim 6 , wherein:

the keypad is configured to be mounted inside a glass window of a vehicle or a building; and

the pointing object is configured to point to the keypad from outside the glass window.

8. The key and lock set of claim 7 , wherein:

the keypad is separate from the lock;

the lock is configured to communicate with the keypad through a wire or wirelessly.

9. A vehicle comprising the key and lock set according to claim 1 .

10. The vehicle of claim 9 , wherein:

the keypad further comprises a band-pass filter disposed adjacent to the photosensitive surface and configured to block ambient light with wavelengths different from wavelengths of the light from the light emitter;

the light from the light emitter is high-frequency pulse light;

the light receiver is configured to receive the high-frequency pulse light while filtering out the ambient light;

the light emitter comprises a light-emitting diode (LED); and

the light receiver comprises a photodiode or a phototransistor.

11. The vehicle of claim 10 , wherein:

the keypad is configured to be mounted inside a glass window of the vehicle; and

the pointing object is configured to point to the keypad from outside the glass window.

12. The vehicle of claim 11 , wherein:

the keypad is separate from the lock;

the lock is configured to communicate with the keypad through a wire or wirelessly.

13. A vehicle comprising a key and lock set, wherein:

the key and lock set comprises:

an electronic key without a built-in a power source;

a lock openable by the electronic key but not openable by a mechanic key, having a power source shared with the electronic key; and

an electronic key reader configured to read an identification of the electronic key, wherein:

the lock is configured to be opened by the electronic key upon said identification matching an identification of the lock;

the identification of the electronic key and the identification of the lock are programmable and configured to be paired;

the key and lock set is configured for a door;

the key and lock set further comprise a keyboard mounted outside the door and is configured to access the lock by accessing from outside the door;

wherein the keyboard is not removable from outside the door and is removable from inside the door through a mounting fastener or a cover;

and further wherein the keyboard comprises a plurality of buttons;

each of the plurality of buttons having a light emitter and a light receiver adjacent to each other,

wherein inside each of the light emitter and the light receiver, a lens or aperture is disposed adjacent to a light-emitting surface or a photosensitive surface, to reduce a light emission angle or a light receiving angle; and

wherein upon the plurality of buttons being pointed to by a pointing object, a reflection of the pointing object causes light emitted from the light emitter to enter into the light receiver.

14. The vehicle of claim 13 , wherein:

the door is a vehicle door; and

the keyboard is mounted on the vehicle.

15. The vehicle of claim 14 , wherein the keyboard is mounted outside the vehicle an area other than the door.

16. The vehicle of claim 14 , wherein the keyboard is mounted outside the vehicle at an area on the door.