9MM cross laser head red laser diode laser diode laser diode

Description:
For a long time to light the laser head please increase the limiting resistance
1, the laser at any time can never point to themselves or others eyes, even if the laser in the closed case will have opened the possibility of error.
2, the laser can not irradiate any reflective surface or smooth surface, excellent laser reflection, on exposure to when the reflective surface will produce reflection, if exposure to human eyes can cause damage.
3, the laser is not a toy, do not give children intelligence is not complete, do not understand the laser characteristics of people, in this case, easily lead to injury.
4, the use of lasers should wear special goggles, the invisible laser, this is particularly important.
5, according to the laser can not vehicles, aircraft have transportation.
6, the laser should pay attention to the safety of the battery, to prevent others from removing the battery or battery explosion caused by short combustion.
Laser emission principle and special nature of the production process determines the characteristics of laser light that does not have a common: the Miyoshi (good monochromaticity, coherence, directionality) high (high intensity).

Mainly used for laser toys, all kinds of level ground instrument etc.,The laser head is composed of a luminous tube core, a condenser lens, adjustable copper sleeve is composed of three parts, to the user, the three part is assembled, the focal length of the lens is good, and with a strong glueWell, the user connected to the 3V DC power supply to work.
 
In theory, in the ideal case (no dust, no smoke, no barrier), the transmission distance of laser is infinite. The laser head in the air quality is high, to the working current of 20mA, the transmission distance can reach more than 1km. In the cloudy night, casually exposure to 200 meters away from the objects are clearly visible; for a short distance, even in the sun during the day, according to in outdoor road, building is clearly visible.
The production of electronic pen: the teacher, the students view on laser projection drawing.
Electronic level meter: let the motor drive head rotational or torsional and projected into the line on the wall, for decoration or posted pictures do the reference level.
Micro LCD projection: remove the condenser, let the laser through the LCD screen can be controlled, can produce clear projection on the wall.
Distance laser listener: make the laser irradiation was eavesdropping on the glass room, then receives a reflected back into the glass of the laser beam to detect the vibration of the glass can restore the room with the sound.
Distance photocontrolled anti-theft alarm: in need of protection of fish ponds or watermelon fields in a corner of the installed laser emission tube, a photosensitive resistor, installed in the other three corners on the reverse side of a mirror, formed door area.
Long distance wireless laser communication transceiver device of a laser using respectively in two distant roof facing each other, the use of serial communication protocol MCU can send and receive files, or even networking.