The effectiveness of board level EMI/RFI shielding depends on many factors: the design of the shielding can, material choice, thickness, venting, method of attachment and the ‘maximum linear dimension’ (the longest contiguous hole or slot). This maximum opening size is a function of the frequency spectrum of the device being shielded and of the attenuation you are trying to achieve.
Profiled and folded shielding cans offer many benefits, including bespoke design, exceptional co-planarity, low tooling costs etc., but one drawbacks is the corner seam, which can act as an emitter antenna if it is not folded and mounted with care. This corner seam can be soldered for complete integrity in high frequency applications but much of the time, the need is simply to reduce the maximum linear dimension.
A new finger joint arrangement on the corner seam allows two adjacent walls to interlock along the corner seam.
Profiled and folded shielding cans offer many benefits, including bespoke design, exceptional co-planarity, low tooling costs etc., but one drawbacks is the corner seam, which can act as an emitter antenna if it is not folded and mounted with care. This corner seam can be soldered for complete integrity in high frequency applications but much of the time, the need is simply to reduce the maximum linear dimension.
A new finger joint arrangement on the corner seam allows two adjacent walls to interlock along the corner seam.
The Quiet Corner design reportedly improves noise attenuation and the mechanical stability of the shielding can.
Ultrasonic Systems will demonstrate the Optima Fluxing System at Productronica next month, in Hall A4 Booth 158. A new Ultra-Spray head produces a more vertical spray pattern, ensuring through-hole penetration when using water-based VOC-free fluxes.
Ultrasonically atomizes VOC-free flux into a fine mist, and then traverses the spray under the circuit at programmable speeds, ensuring flux penetration of the plated-through holes.
Can process circuit boards up to 24” (61 cm) wide and 0.250” (6.35 mm) thick, with plated through holes of 0.015” (0.381 mm) in diameter.
Optima Fluxing System, ultraspray.com.
Ultrasonically atomizes VOC-free flux into a fine mist, and then traverses the spray under the circuit at programmable speeds, ensuring flux penetration of the plated-through holes.
Can process circuit boards up to 24” (61 cm) wide and 0.250” (6.35 mm) thick, with plated through holes of 0.015” (0.381 mm) in diameter.
Optima Fluxing System, ultraspray.com.
Micro-Line Digital Dispensing Head consists of a high-speed liquid metering valve and a precision nozzle.
Applies conformal coatings in precise lines or dots down to 1 mm with the liquid flow rate set electronically with the Prism software. The coating is applied at a distance from 5 to 15 mm between the nozzle tip and the substrate. The technology is said to be more effective than conventional needle dispensing.
Ultrasonic Systems, ultraspray.com
Applies conformal coatings in precise lines or dots down to 1 mm with the liquid flow rate set electronically with the Prism software. The coating is applied at a distance from 5 to 15 mm between the nozzle tip and the substrate. The technology is said to be more effective than conventional needle dispensing.
Ultrasonic Systems, ultraspray.com
GETEK HR high speed, low loss laminates and prepregs are CAF resistant, lead-free assembly compatible materials said to deliver enhanced thermal performance and high reliability, while enabling PWB fabricators to experience substantially improved FR-4 processability.
Has low dielectric constant, low loss and low z-axis expansion.
“GETEK HR, with its low z-axis expansion and high decomposition temperature, is well suited for thick multilayer PWBs requiring improved electrical performance, as well as high speed and low loss products that will be assembled in a lead-free process compliant with the EU’s RoHS directive.” said Ed Kelley, director of OEM marketing.
With manufacturing in both the U.S. and Taiwan, is readily available in prototype to high-volume quantities. Customers UL approval for manufacturing with GETEK will also be able to use GETEK HR.
Used for a broad range of applications that include telecommunications equipment, high speed computing and storage, test and measurement equipment, medical electronics, IC substrates, and RF and wireless electronics.
Polyclad Laminates, polyclad.com
Has low dielectric constant, low loss and low z-axis expansion.
“GETEK HR, with its low z-axis expansion and high decomposition temperature, is well suited for thick multilayer PWBs requiring improved electrical performance, as well as high speed and low loss products that will be assembled in a lead-free process compliant with the EU’s RoHS directive.” said Ed Kelley, director of OEM marketing.
With manufacturing in both the U.S. and Taiwan, is readily available in prototype to high-volume quantities. Customers UL approval for manufacturing with GETEK will also be able to use GETEK HR.
Used for a broad range of applications that include telecommunications equipment, high speed computing and storage, test and measurement equipment, medical electronics, IC substrates, and RF and wireless electronics.
Polyclad Laminates, polyclad.com
Intellect software release 1.2 for DVT vision sensors features improvements to the intuitive user interface, making inspection, precision measurement, counting and object location applications easier.
“The new Intellect software has a user-friendly interface that incorporates the familiar Windows look and feel,” said Kris Nelson, senior VP, Vision Sensors. “This simplified user interface will help customers get DVT vision sensors up and running faster and easier.”
The release increases object sorting efficiency by allowing a single tool to identify and count multiple shapes or colors; it also includes faster image updates, a new OCV tool, custom drivers for robotic applications and a preconfigured tool for label position and gross defect inspection. Communications enhancements simplify data and image transfer and provide browser accessibility and tight integration with HMI and other industrial software packages.
A free download is available: cognex.com/dvt
“The new Intellect software has a user-friendly interface that incorporates the familiar Windows look and feel,” said Kris Nelson, senior VP, Vision Sensors. “This simplified user interface will help customers get DVT vision sensors up and running faster and easier.”
The release increases object sorting efficiency by allowing a single tool to identify and count multiple shapes or colors; it also includes faster image updates, a new OCV tool, custom drivers for robotic applications and a preconfigured tool for label position and gross defect inspection. Communications enhancements simplify data and image transfer and provide browser accessibility and tight integration with HMI and other industrial software packages.
A free download is available: cognex.com/dvt
Cognex Corp., cognex.com
The Model 22 trimmer is a RoHS-compliant, 3-mm single turn potentiometer with extended resistance range. The sealed surface mount, cermet trimming potentiometer is available in J-hook and side-mount designs.
According to Barbara Wiesinger, director of product development for BI Technologies Electronic Components Division, “The 3-mm size is ideal for designers who are trying to maximize use of space on a printed circuit board. The price of the potentiometers has also been reduced, making them competitive for a wide range of applications.”
The device features resistance range from 10 to 2MW; a standard resistance tolerance to ±20% and absolute TCR values to ±100ppm/°C; and power ratings to 0.125W at 70°C. Operating temperature range is -55° to +125°C, and the devices are RoHS compliant.
Feature a 12-mm tape width and 4-mm sprocket pitch, available in tape and reel packaging.
According to Barbara Wiesinger, director of product development for BI Technologies Electronic Components Division, “The 3-mm size is ideal for designers who are trying to maximize use of space on a printed circuit board. The price of the potentiometers has also been reduced, making them competitive for a wide range of applications.”
The device features resistance range from 10 to 2MW; a standard resistance tolerance to ±20% and absolute TCR values to ±100ppm/°C; and power ratings to 0.125W at 70°C. Operating temperature range is -55° to +125°C, and the devices are RoHS compliant.
Feature a 12-mm tape width and 4-mm sprocket pitch, available in tape and reel packaging.
BI Technologies, bitechnologies.com/products/single_trim.htm
