Having issues with 2. Mounting Failures in LEDs with a Lens by NICHIA? Read our step-by-step SMT maintenance solution below. If you require replacement feeders, nozzles, or sensors, contact SMTBOX for OEM-compatible parts.
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: Damage to the lens during the mounting process
Problem 2: 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: LED tilting within the cavity due to its adhesion to the top cover tape
Problem 4: 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.
Our editorial team consists of senior SREs, mechanical engineers, and SMT assembly specialists with over 15 years of industry experience in PCB assembly line optimization. All technical articles are reviewed and verified for mechanical and electronic compatibility before publication.