In the decomposition inspection process of a conventional red laser pen, the author took some time to remove the small circuit board in the pen cap, and finally removed the button before removing the circuit board. After orange check, the failure of the laser pointer is caused by the failure of the micro switch, the fault is removed after the replacement of a new switch. Reassembly can be reversely restored in accordance with the process of disassembly.
Repair steps:
There are two parts of the laser pointer: the pen holder (used to hold two no. 5 batteries), the pen photodiode, lens, circuit board and button are all installed here.
Decomposition method: 1. Pull out the protective rubber pad inside the pen cap with tweezers; Press the button underground and dial outward to remove the button first; 2. Screw out the copper joint and circuit board assembly from the light outlet at the top of the pen cap. Circuit boards with copper fittings installed, red laser diode, lens in copper joint thread hole, with the seam allowance on a screw hole pressure, and is particularly important, circuit board assembly can split from the cap, all by the screw hole with the seam allowance (light from the laser pen at the top of the cap hole, with a suitable screwdriver turned out).
A laser pen interference, diffraction experimental device, which comprises a light bracket, base, high powered laser pen, double seam or single seam, magnifying glass, light screen and support, which is characterized in that: the central part of the light bracket with a screw hole, screw into the upper base, so that the light bracket is fixed on the base; The laser pen is clamped, and the lower end of the support rod welded together with the clamp is inserted into the movable support attached to the optical support and is fixed by screws; Double seam, single seam, magnifying glass and light screen are attached with support rods, their lower ends are inserted into the movable support attached to the light bracket and fixed by screws.
