Page 72
www.us-tech.com Die Attach Voiding in LED Assemblies Continued from previous page
of the operating temperature. Al - though these were not deterministic numbers, they allowed estimation of how many of the sold luminaires would return from the field. The team measured a set of
LEDs in operation and determined several points that related void area to operating temperature. Based on that information, the team could
The data showed that out of the
1,000 LEDs inspected, 133 were expected to fail within the standard warranty period, while 540 would fail under the extended warranty. Since the product had been in the market for over a year, the customer was able to validate the information.
Process Control Tight control of the manufactur-
ing process is critically important to the profitable success of an LED luminaire producer. In this analysis, Creative Electron worked with the customer through several aspects of manufacturing to improve yield and reduce voiding. These included: sub- strate surface cleanness; substrate and LED metallization; reflow oven temperature profile; paste selection, dispensing and storage; LED and substrate handling; and storage. The results of this analysis
Figure 3: scanning electron microscope image of LED assem- bly showing thermal gap created by voids.
relate the amount of voiding to the expected junction temperature. After putting all the information together, Creative Electron created a distribu- tion of the number of LEDs over time that would return while under the standard warranty and those that would return in the extended war- ranty period.
showed that the customer far under- estimated the cost of returned prod- ucts. Not only did the pricing model used by the company have a deficit within the standard warranty, it had an even larger deficit within the extended warranty period. In conse- quence, the company had to tem- porarily change its pricing structure to compensate for product shipped with the deficient manufacturing process. The production process was completely overhauled, bringing it in line with tighter standards. As man-
MICROLINE 2000
Laser Depaneling Systems
Stress Free, Burr Free, Particle Free
Low Investment and Operating Cost
t Cost
Cuts Flex, Rigid or Rigid-Flex PCB’s
d or
agement thinker Peter Drucker said, “If you can’t measure it, you can’t improve it.” Now, the manufacturer uses void area as its key metric to measure process control quality.
Contact: Creative Electron, Inc.,
253 Pawnee Street, San Marcos, CA 92078 % 760-752-1192 E-mail:
info@creativeelectron.com Web:
www.creativeelectron.com r
Best User Experience for Wire Processing Equipment
Continued from page 63
enables/disables key functions, including the work light, buzzer and modes of operation.
Processing settings are cap- tured, stored, reused, and acces- sible to the operator. Processing “recipes,” which are
unique to the wire characteristics, job at hand, and finished product require- ments, are captured and main tained in a library that can store several thou sand items. Once proven, re- using these settings significantly enhances lean production, product repeatability and quality. Processing multicore cables is
facilitated by an additional sequencing library. The library captures individ- ual wire settings and displays the wire color on the main screen to prompt the operator within one multicore cable processing program. Library contents may be edited, sorted and tagged for ease of data access. Password protec- tion and USB drive backup and restoration are provided.
Physical ergonomic considera- tions should enhance operator convenience and comfort. Simple enhancements, such as LED lighting
and an air jet in the wire processing area, a carrying handle, wrist pad, and an accessible toolbox with neces- sary calibration tools, offers operator convenience. For the Mira 340, inte- gration with a barcode reader enables error-free data entry. These five interface design prin-
ciples and characteristics reduce training time and facilitate rapid onboarding of production plant per- sonnel, an advantage particularly useful in regions with high worker turnover. The intuitive nature of the Mira
platforms, with its smartphone-like user interface is particularly appeal- ing to younger operators. This may raise their expectations concerning human-centered platform design, not only in wire processing equipment but in other semi-automated produc- tion and processing tools in a variety of manufacturing settings. Contact: Komax Corp., 1100 E
Corporate Grove Drive, Buffalo Grove, IL 60089 % 224-676-5743 E-mail:
liz.cappellania@
komaxgroup.com Web:
www.komaxwire.com r
See at productronica, Hall A5 Booth 211
October, 2017
MicroLine 2000 series available in stand-alone or in-line configuration
Call us to learn more about laser depaneling 1-800-345-5753 |
www.lpkfusa.com/depaneling
See at productronica, Hall B2 Booth 303 and The ASSEMBLY Show, Booth 1002
See at productronica, Hall A3 Booth 447 / Hall B2 Booth 517
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