POINT-SOURCE Datasheet, PDF (1/2 Pages) Marktech Corporate – Point Source Emitters

Point Source Emitters
Product Overview
The Marktech Point Source Emitter series incorporates a specially
designed LED die and aperture window to create a precise,
unobstructed light output pattern. The key design feature of
the Point Source LED die is a wire bond which attaches next
to the emission window as opposed to the center of the window
eliminating any dark spots in the light output pattern. Traditional
wire bonding of a standard LED emitter die is attached to the top
center of the die which creates a “dark spot” and therefore will
effect the light output from device to device. These variations in
light output of a standard LED emitter can have a negative affect
in a critical sensing application.
The Point Source series outperforms standard emitters at high
speeds yielding a stable output pattern and making them the
device of choice for applications which include encoders and
linear positioning equipment. High reliability package options
range from TO-18 and TO-46 metal cans to ceramic surface
mount packages. Varying package heights and lensing options
provide the designer with optimum flexibility in sophisticated
design efforts. Devices supplied without optics are manufactured
with a flat glass window allowing the designer to utilize proprietary
collimating or other application specific optics to take full
advantage of the undistorted beam. Custom packaging designs
which include Chip on Board configurations or custom apertures
are also available.
Emitting Light
Cathode
Emitting Light
P-Layer
Active Area
n-Layer
Substrate
Anode
Emitting Light
Cathode
P-Layer
Active Area
n-Layer
Substrate
Anode
Terminal Pins
Standard LED
Terminal Pins
Point Source Emitter LED
For illustrative purposes only. Drawings are not to scale.
Unobstructed Light Output
In a simple side by side lighting comparison, the light emitted form
the Standard LED (left) has several dark spots due to the wire
bonding pad and obstruction from the wire bond. The Point Source
Emitter (right) has a narrow, well defined and precise light output
pattern.
Narrow Spectral Bandwidth
A key feature of the the Point Source LED series is a very narrow
spectral bandwidth. Custom sorting of wavelength as well as other
key parameters is available. Please contact Marktech to discuss the
application.
Spectral Output
120
100
80
60
40
20
0
750
800
850
900
950
Wavelength (nm)