Laser Cutting Trimming
Shop for laser cutting resources online, compare and save.
www.lopup.com

Three Dimensional Laser Cutting
High precision 3 dimensional lser cutting since 1983. Prototype through production with 24 hour emergency service available. Maximum yield of parts per sheet. Major credit cards accepted.
www.lasercuttinginc.com

Tree Trimming Asph
Find Bargain Prices On Tree Trimming Asph.
BizRate.com

Laser Trimming
Find laser trimming and Compare prices at Smarter.com.
www.smarter.com

Laser Trim
Find laser trim at Great Prices.
www.Pronto.com

Cutting Laser
Looking for Cutting Laser? Find exactly what you want today.
www.eBay.com

CNC Laser Cutting
Heavy Duty Affordable CNC Cutters. We Make a Machine for Every budget.
www.MultiCam.com/cnclaser

Plymouth Laser Vehicle Types
Plymouth Laser Car Specs Plymouth Laser Road Tests & Photos.
www.InsideLine.com

Custom Mirrored Stainless Steel Plates
18 gauge mirrored-finished, laser-cut, stainless steel license plates. Includes durable plastic background plate in color of your choice to highlight name, logo, or emblem cut out of plate.
www.autoplates4u.com

Laser Trimmer
Great Deals for Your Home & Garden laser trimmer At Low Prices.
shopping.yahoo.com

Warning: mkdir() [function.mkdir]: Permission denied in /home/webs/affiliatelib2/CacheManager.php on line 12

Warning: mkdir() [function.mkdir]: No such file or directory in /home/webs/affiliatelib2/CacheManager.php on line 12

Warning: fopen(/home/templatecore2cache//*cluesnet.com/fe/fea27180ff7cf048c64cbe2b34979b9a8f2ae478.tc2cache) [function.fopen]: failed to open stream: No such file or directory in /home/webs/affiliatelib2/CacheManager.php on line 130

Warning: fwrite(): supplied argument is not a valid stream resource in /home/webs/affiliatelib2/CacheManager.php on line 131

Warning: fclose(): supplied argument is not a valid stream resource in /home/webs/affiliatelib2/CacheManager.php on line 132

Laser trimming is a term that describes the manufacturing process of using a LASER to adjust the operating parameters of an electronic circuit.

The usual approach is to use a laser to burn away small portions of resistors, raising their value (resistance). The burning operation can be conducted while the circuit is being tested by automatic test equipment, leading to extremely accurate (appropriate) final values for the trimming resistor(s) (also known as AOT - Adjust on test).

Laser trimming is the controlled alteration of the attributes of a capacitor or a resistor by a laser beam. Selecting one or more components on the circuit and adjusting them with the laser achieves this. The trim changes the resistor or capacitor value until the nominal value has been reached.

The resistance value of a film resistor is defined by its geometric dimensions (length, width, height) and the resistor material. A lateral cut in the resistor material by the laser narrows the current flow path and increases the resistance value. The same effect is obtained whether the laser changes a thick-film or a thin-film resistor on a ceramic substrate or an SMD-resistor on a SMD circuit. The SMD-resistor is produced with the same technology and normally is laser trimmed as well.

Trimmable chip capacitors are build up as multilayer plate capacitors. Vaporizing the top layer with a laser decreases the capacitance by reducing the area of the top electrode.

Passive trim is the adjustment of a resistor to a given value. If the trimming adjusts the whole circuit output (e.g. output voltage, frequency, switching threshold ...), this is called active trim. During the trim process, the corresponding parameter is measured continuously and compared to the programmed nominal value. The laser stops automatically when the value reaches the nominal value.

Trimming LTCC resistances in a pressure chamber The passive trimmer how works with a pressure chamber, makes the resistor trimming in one run possible. The LTCC boards are contacted by the assembly side and trimmed by the resistor side. With these revolutionary trimming concept needs one no more contacting places between the resistances, because the fine pitch adapter are contacting at the other side on the places for the units. So the LTCC can be arranged many more compact and more cheaper.

Function mode:

• The LTCC goes in the contacting unit.
• From the bottom side it comes a rigid needle adapter under the LTCC.
• From the top side come now a pressure chamber to the product and give a pressure from 1 to 4 bars to the LTCC.
• If we have the pressure we make an air flow, so that the trimming particles to be take off.
• The rigid needles contact the LTCC from the bottom side.
• The measuring technique measures resistances.
• Through the pressure glass the laser trims the resistances.

Advantages with this trimmer:

• Trimming of unlimited printed resistors in one step → 100% Alignment liberty.
• No contamination on board, adapter or in system.
• Contact area up to 101.6mm x 101.6mm (4" x 4").
• Automatic system compensation for temperature fluctuation.
• No need for dedicated trimming test pads.
• Using Rigid Needle Adapter: pitch 150 µm, pad size 70 µm.
• More than 500'000 contacting cycles with the adapters.
• Density < 280 points/cm².

→ All these advantages speak for the economy of this function

Trimming potentiometers Often designers use potentiometers, which would have to be adjusted during end testing until the desired function of the circuit has been reached. In many applications, the end user of the products does not allow potentiometers. Therefore manufacturers determine the needed resistance or capacitance values by measurement and calculation methods and afterwards solder the suitable component into the final PCB.

It is simpler to substitute the potentiometer or the adjust element with a trimable chip resistor or chip capacitor and the potentiometer adjusting screwdriver with the laser and active trimming. The achieved accuracy is higher, the procedure can be automated and the long term stability is better than at potentiometers or at least in the same region as replace-and-resolder chip components. Often the laser for the active trim could can integrated in existing measurement places at the customer factories.

Program from digital logic circuits A similar approach can be used to program digital logic circuits. In this case, Fuse (electrical) are blown by the laser, enabling or disabling various logic circuits. An example of this is the IBM IBM POWER processor chip where the chip contains five banks of cache memory but only requires four banks for full operation. During testing, each cache bank is exercised. If a defect is found in one bank, that bank can be disabled by blowing its programming fuse. This built-in redundancy allows higher chip Fabrication (semiconductor) than would be possible if all cache banks had to be perfect in every chip. (If no bank is defective, a fuse can be blown arbitrarily, leaving just four banks.)

External links

• Laser trimmers with a pressure chamber
• System manufacturer laser trimmers
• Representative of GSI laser trimmers

For Your Business - Industrial/Manufacturing - Industrial ...
Laser Trimming Machines : For the latest advanced products, services and systems to enhance your capabilities

Laser trimming - Wikipedia, the free encyclopedia
Laser trimming is a term that describes the manufacturing process of using a LASER to adjust the operating parameters of an electronic circuit. The usual approach is to use a laser ...

Laser cutting, green laser component trimming - Chess Systems
Chess Systems Ltd. is a specialist automation company skilled in bespoke machine design and build, motion control, robotics, machine vision, laser solutions, nanotechnology ...

Laser Resistor Trimming - Active & Passive - Hybrid Devices
Specializing in laser resistor trimming of large hybrid microelectronic circuit boards, active and passive. ... Laser Resistor Trimming of Thick- and Thin-Film Hybrid ...

Laser Resistor Trimming FAQs
laser resistor trimming of large hybrid microelectronic circuit boards, active passive. ... Laser Resistor Trimming FAQs 1. What's involved in doing thin- or ...

CCT Laser Services: Trimming and Micromachining
Quality laser trimming and micromachining with the fastest possible turnaround and economical pricing.

Laser Trimming :: Walker Tool & Die, Inc.
Speed and accuracy. We’ve been offering technologically advanced 6-axis laser trimming for over a decade.

GSI Group - Laser System - WaferTrim - Analog & Mixed Signal Repair
For analog and mixed signal device production, GSI Group WaferTrim™ laser systems are the industry leader in laser trimming of resistors ...

GSI Group - Laser Systems - CircuitTrim™ Component, Module & Device ...
Innonative Trim Solutions designed for your next application. If you are manufacturing components, RF modules, or other microelectronic devices on ceramic, PCB ...

Lee Laser, Inc. - Industrial Solid State laser applications
Laser Diamond Cutting: Laser Micro-Cutting: Laser Marking: Laser Heat Treating: Laser Trimming: Laser Engraving: Laser Scribing: Contact us for more info