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Suppressing the Piezo Effect

Patent

US9119299

Owner

Filing Date

July 21, 2006

Priority Date

July 21, 2006

Portfolio

Components - OSRAM

Intro

The invention discloses a printed circuit board (PCB) that suppress vibration or noise caused by connected electronic component such as ceramic capacitors, ferrite magnet coils.

Claims

1. A printed circuit board comprising: at least two spaced apart conductor tracks arranged on the printed circuit board, and an electronic component w...
  1. A printed circuit board comprising: at least two spaced apart conductor tracks arranged on the printed circuit board, and an electronic component which is connected to the at least two conductor tracks and which triggers mechanical oscillations during operation, thereby propagating acoustic waves in the printed circuit board, wherein: a base area of the electronic component has at least two substantially straight side walls opposing each other, and the printed circuit board comprises exactly two spaced apart substantially straight slots respectively arranged on opposite sides of the electronic component, the two slots running parallel to respective ones of the at least two substantially straight side walls of the electronic component and being formed in the printed circuit board so as to prevent propagation of the acoustic waves triggered during operation of the electronic component in the printed circuit board; wherein each of the two slots is formed entirely within an outer peripheral edge of the printed circuit board and is parallel to at least a part of the at least two conductor tracks.  
  2. The printed circuit board as claimed in claim 1, wherein the base area of the electronic component is rectangular.  
  3. The printed circuit board as claimed in claim 1 or 2, wherein the two slots are adjacent to respective ones of the at least two conductor tracks with the at least two conductor tracks being interposed between the two slots.
  4. The printed circuit board as claimed in claim 1, wherein the base area of the electronic component is rectangular with two long and two short side walls, and the two slots run in a straight line parallel to the respective short side walls.
  5. The printed circuit board as claimed in claim 1, wherein the base area of the electronic component is rectangular with two long and two short side walls, and the two slots run in a straight line parallel to the respective long side walls.
  6. The printed circuit board as claimed in claim 1, wherein at least one of the two slots is longer than the side wall of the electronic component to which it is adjacent.
  7. The printed circuit board as claimed in claim 1, wherein the electronic component comprises a surface-mounted ceramic capacitor.
  8. The printed circuit board as claimed in claim 1, wherein the electronic component comprises a magnet coil.
  9. The printed circuit board as claimed in claim 4, wherein at least one of the two slots is longer than at least one of the two short side walls of the electronic component.
  10. The printed circuit board as claimed in claim 5, wherein at least one of the two slots is longer than at least one of the two long side walls of the electronic component.
  11. The printed circuit board as claimed in claim 1, wherein the at least two conductor tracks are parallel to each other.
  12. The printed circuit board as claimed in claim 11, wherein the at least two conductor tracks are parallel to the two slots.
  13. The printed circuit board as claimed in claim 1, wherein at least two of the electronic components are provided.
  14. The printed circuit board as claimed in claim 1, wherein (i) the at least two conductor tracks, (ii) the at least two side walls of the electronic component, (iii) the two substantially straight slots, and (iv) side walls of the printed circuit board all extend in directions parallel to each other. 
  15. The printed circuit board as claimed in claim 1, wherein each of the two slots is provided apart from its respective side wall of the electronic component at a distance such that a substantially same phase of the mechanical oscillations triggered by the electronic component during operation passes to the slot over an entire length of the slot.
  16. The printed circuit board as claimed in claim 1, wherein each of the two slots has four sides.  
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Abstract

Surface mounted ceramic capacitors (14) on printed circuit boards (10′) are subject to vibrations (18) caused by the piezo effect. Other electro...
Surface mounted ceramic capacitors (14) on printed circuit boards (10′) are subject to vibrations (18) caused by the piezo effect. Other electronic components are subject to magnetostriction and likewise generate vibrations. In prior art, the vibrations can propagate (20) on a printed circuit board (10). To suppress the propagation of the vibrations caused by the electronic component (14), the invention provides at least one slot (22) in the printed circuit board (10′). The slot (22) extends, for example, parallel to a side wall of the electronic component (14).
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Conroy
June 08, 2018

1. The ability to reduce the effects of vibration on print circuit could in certain applications help to improve the mean time to failure leading to improve reliability.. 2. Conversely, in contrast to the abstract and subject to frequency response, the ability to vibrate PCB could be useful in situations where haptic feedback is a need feature within the overall product. 3. Cautiously, while it is mentioned within the abstract that the vibrations can be designed to lie outside of the audible hearing rang, the prevention of in-band audible artefacts caused by antialiasing and intermodulation effects for indidvidual designs may prove to be non-trivial.
Applications: 1) Vibration reduction in high reliability and critical electronic products., where failure under stress is a challenging requirement, e.g. high acceleration vehicles, 2) the idea could have potential where haptic feedback is needed in certain products., e.g. in smartphones.
Companies: 1. Defence / Airspace / Motor racing, 2. Smartphone and interactive consumer device- GoodIP: Thank you for your insightful comments, CBX001!

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