Features:
The head moves outward from the central movement in the region of the table of actors, find the location on the disk by emitting, prompted to accept the output of the reflected signal in electronic data.
The head is the essential part of the CD player, and is also the most sophisticated part.
The head mainly includes the generator (also known as diode), semi-reflective prism, objective lens, lens and photoelectric diode.
When the head reads the data on the disk, the light from the generator passes through a semi-reflection prism and converges on the objective lens; the lens will make extremely tiny dots on the CD.
Due to the reflection material on the disk, the light will reflect, through the objective lens, and then illuminate on a semi-reflective prism.
Since the prism is semi-reflective, the light beam cannot pass through it completely, but has reached the photo-diode through the lens.
Due to the disk, the uneven point is uneven to save data, so the reflected light will be in different directions;
People define a different direction of the signal as 0 or 1, the light-emitting diodes get the data from 0.1 and, ultimately, solve it like the data we need.

Specifications:

Model: PVR-802W KHM430G.
Excitation Mode: Electric Excitation
Mode: Continuous
Wavelength Range: Visible Light

Length: 4.8 cm/1.88 inches.
Weight: 20 g (approx.)

Package includes:
1 x head.