Features:
L-a-s-e-r
head move outward from center movement in the region of the
Table-of-Contents, find location on the disk by emitting l-a-s-e-r, induced
resistance to accept to the reflected signal output into electronic
data.
L-a-s-e-r
head is a the essential part of CD drive, and also is the most
sophisticated part.It is mainly used for data reading, so take special
care when cleaning drive inside.
L-a-s-e-r
head mainly includes l-a-s-e-r generator (also known as l-a-s-e-r diode),
semi-reflective prism, objective lens, lens and photoelectric diode.
When
l-a-s-e-r head reads the data on disc, the l-a-s-e-r light from l-a-s-e-r generator
goes through semi-reflecting prism and converges on the objective lens;
lens will make l-a-s-e-r into extremely tiny points on CD.
Because
of the reflection material on the disc, light will reflect back,
through the objective lens, then illuminate on semi-reflecting prism.
Since prism is semi-reflecting, light beam can not goes through it completely, but reached the photo-diode through the lens.
Due to the disc surface is uneven point to record data, so the reflected light will be in different directions;
people
define different direction of signal as "0" or "1", light-emitting
diodes gets the data of "0", "1", and ultimately resolve them as the
data we need.
Specifications:
Model: PVR-802W
Excitation Mode: Electric excitation
Operation Mode: Continuous
Wavelength Range: Visible light
Length: 4.8cm/1.88in
Weight: 20g(approx.)
Package Includes:
1 x L-a-s-e-r Head