NVSU119C-E Datasheet, PDF (27/34 Pages) NICHIA CORPORATION – SPECIFICATIONS FOR UV LED

Application Note
Mounting Techniques for LEDs with a Lens
1. Introduction
As LEDs have recently been miniaturized and highly-functional, higher mounting technologies are necessary
for them. It has been difficult to mount such advanced LEDs because of the lenses and the smaller
absorption area. Improper mounting will affect the function and the reliability of the performance from the
end product. To manufacture high-performance lighting fixtures with high functional LEDs, it is critical to
develop the mounting technology.
We have seen many mounting problems in highly-functional LEDs with a lens. This document provides the
mounting techniques for such LEDs, exhibiting some mounting failures. Please note that this document
recommends a modular mounter to be used.
2. Mounting Failures in LEDs with a Lens
Many LEDs with a lens have been developed for higher performance. Such lenses are mostly made of resin;
when external stress is applied to the lens, some are susceptible to damage, leading to abnormal optical
characteristics, and others are susceptible to wire breakage, leading to abnormal electrical characteristics.
Therefore, applying external stress to the lens has to be avoided as much as possible.
Moreover, the contact area of a pick-and-place nozzle and the lens is limited by the presence of the lens,
which sometimes causes air leak, resulting in absorption error.
Problem 1:
Problem 2:
Damage to the lens during the mounting process
Absorption error due to air leak
An LED lens sometimes sticks to the top cover tape due to the resin’s adhesive property, resulting in LED
tilting within the cavity.
Also, the center of gravity of an LED with a lens is located higher. When the emboss carrier tape is exposed
to an excessive vibration, the LED may be tilted within the cavity.
Problem 3:
Problem 4:
LED tilting within the cavity due to its adhesion to the top cover tape
LED tilting within the cavity due to vibration of the emboss carrier tape
Please refer to the following sheets for the countermeasures against Problems 1 to 4.
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This sheet contains tentative information; we may change contents without notice.