UNIDIRECTIONAL PARTICLE DAMPER FOR PRINTED CIRCUIT BOARDS AND PLANAR SURFACES

Abstract

An apparatus and system for attaining maximum unidirectional response to vibration damping of a printed circuit board (PCB) or other planar surface utilizing a defined travel displacement of a single tungsten (or other material) cylindrical rod in a single or plurality of sealed cylindrical chambers in a particle impact damper (PID). The single tungsten (or other material) cylindrical rod is not weighed down, constrained, encumbered within the chamber; accordingly, providing unrestricted freedom for the cylinder to quickly respond in a unidirectional direction at the first occurrence of excessive vibrational acceleration over 1G. The structure of a single cylindrical particle within a sealed cylindrical chamber also provides a path of minimum distance for the cylinder to travel before colliding with the ceiling or floor of the PID chamber. A plurality of cylindrical chambers can be arranged in a variety of patterns within the PID housing such as desired. The PID housing can be any shape such as a cube, a rectangular cuboid, a cylinder, sphere, triangular tetrahedron, triangular prism, polygon, toroid or any combination of shapes.

Claims

1. A particle impact damper for use with printed circuit boards, comprising: a housing having one or more separate elongate shaped chambers, each elongate shaped chamber defined by a floor and ceiling and one or more surfaces that surround an open cavity of the chamber; and one or more particles, each of the one or more particles disposed in one of the one or more elongate shaped chambers, the elongate shaped chamber having an effective diameter that is greater than an effective diameter of the particle and having a length that is longer than a length of the particle, wherein the one or more particles are configured to move unconstrained unidirectionally within the one or more elongate shaped chambers between the one or more flat surfaces to thereby dampen a vibration force applied to the particle impact damper or a component attached to the particle impact damper.

2. The particle impact damper of claim 1, wherein the one or more particles is a plurality of particles and the one or more elongate shaped chambers is a plurality of elongate shaped chambers, each of the particles being individually housed in one of the plurality of elongate shaped chambers.

3. The particle impact damper of claim 2, wherein the plurality of elongate shaped chambers are aligned in a single row.

4. The particle impact damper of claim 2, wherein the plurality of elongate shaped chambers are stacked in a plurality of columns.

5. The particle impact damper of claim 2, wherein the plurality of elongate shaped chambers are arranged in symmetrical or asymmetrical packing patterns.

6. The particle impact damper of claim 1, wherein the housing has one of a cube shape, a rectangular cuboid shape, a toroidal shape, and a cylindrical shape.

7. The particle impact damper of claim 1, wherein the housing comprises one of a plastic, a ceramic, and a metal material.

8. The particle impact damper of claim 1, wherein the particles comprise one of a metal, a plastic, a liquid or a powder.

9. The particle impact damper of claim 8, wherein the one or more particles comprise a tungsten material.

10. The particle impact damper of claim 1, wherein the one or more elongate shaped chambers are one or more cylindrically shaped chambers having a curved surface with a diameter that is at least 1% larger than a diameter of the particle and a length that is at least 7% longer than the length of the particle.

11. In combination with a printed circuit board, a particle impact damper comprising: a housing defining a plurality of separate storage chambers therein; and a plurality of elongate particles, each elongate particle disposed and configured to move in a first direction or a second direction only within one of the plurality of storage chambers, wherein the second direction is opposite to the first direction; wherein an effective diameter of each of the storage chambers is greater than an effective diameter of the elongate particle disposed in the storage chamber to thereby provide a damping performance of the particle impact damper on the printed circuit board.

12. The combination of claim 11, wherein the housing has one of a cube shape, a rectangular cuboid shape, a toroidal shape, and a cylindrical shape.

13. The combination of claim 11, wherein said plurality of storage chambers are cylindrically shaped and wherein each of the elongate particles are cylindrically shaped particles.

14. The combination of claim 11, wherein the plurality of storage chambers is arranged in one or more stacked rows.

15. The combination of claim 11, wherein said storage chambers are arranged in symmetrical or asymmetrical packing patterns.

16. The combination of claim 11, wherein the housing comprises one of a plastic, a ceramic, and a metal material.

17. The combination of claim 11, wherein the particles comprise one of a metal, a plastic, a liquid or a powder.

18. The combination of claim 11, wherein the one or more chambers has an effective length at least 7% longer than an effective length of the elongate particle.

19. The combination of claim 11, wherein the plurality of elongate particles comprise tungsten.

20. The combination of claim 11, wherein the housing comprises a top plate, a middle plate and a bottom plate coupleable to each other to define the housing, at least one of the storage chambers defined at least in part by a cavity in the middle plate.

21. The combination of claim 11, wherein the printed circuit board assembly comprises a planar surface on which the particle impact damper is mounted.

22. The combination of claim 11, wherein the collective mass of the plurality of elongate particles is greater than 7% of the combined mass of the printed circuit board assembly populated with components.

23. A particle impact damper for use with printed circuit boards, comprising: a housing having one or more separate elongate shaped chambers, each elongate shaped chamber having a first end surface, a second end surface opposite the first end surface, and an open cavity extending between the first and second end surfaces; and one or more particles, each of the one or more particles disposed in only one of the one or more elongate shaped chambers, the elongate shaped chamber having an effective diameter that is greater than an effective diameter of the particle and having a length that is longer than a length of the particle, wherein: the one or more particles are configured to move within the one or more elongate shaped chambers in a first and a second direction only, wherein the second direction is opposite to the first direction, between only the first end surface and the second end surface, to dampen a vibration force applied to the particle impact damper or a component attached to the particle impact damper as the particle strikes the first end surface or the second end surface.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG. 1 is a front cross-sectional view of the prior art showing a particle impact damper (PID) with a plurality of tungsten balls filled to approximately 90% that is sealed in a single closed metal cylindrical container and adhesively coupled to the geometric center on the surface of a printed circuit board (PCB).

[0032] FIG. 2A is a cross-sectional view of one embodiment of a particle impact damper (PID) with a single particle that is sealed inside a single cylindrical chamber in the PID container constructed of two sections.

[0033] FIG. 2B is a perspective view of a sealed version of FIG. 2A, one of the two sections of the PID container shown in phantom to allow a view of the single particle in the PID container.

[0034] FIG. 2C is an exploded view of FIG. 2B.

[0035] FIG. 2D is a cross-sectional view that shows the diameter of a single chamber and the diameter of a single particle.

[0036] FIG. 2E is a perspective view of another embodiment of the apparatus of FIG. 2D.

[0037] FIG. 3A is an exploded view of another embodiment of a PID with a plurality of particles individually stored in a plurality of sealed spherical chambers in the PID constructed of two sections.

[0038] FIG. 3B is a cross-sectional view of the PID of FIG. 3A once assembled.

[0039] FIG. 4A is a perspective view of another embodiment of the PID of FIG. 2B with a plurality of cylindrical chambers constructed of a plurality of sections.

[0040] FIG. 4B is a cross-sectional view of the apparatus of FIG. 4A.

[0041] FIG. 4C is a front facing cross-sectional view of the apparatus of FIG. 4B.

[0042] FIG. 5 is an exploded view of the apparatus of FIG. 4A.

[0043] FIG. 6A is a top view of the top section of the apparatus of FIG. 4A.

[0044] FIG. 6B is a front facing cross-sectional view of the apparatus of FIG. 6A.

[0045] FIG. 6C is the bottom view of the top section of FIG. 6A with a plurality of particles arranged in a staggered (e.g., hexagonal) pattern.

[0046] FIG. 7A is a front facing cross-sectional view of an inner (middle) layer section of apparatus of FIG. 4A.

[0047] FIG. 7B is a top view of the apparatus of FIG. 7A.

[0048] FIG. 8A is a top view of the bottom section of the apparatus of FIG. 4A.

[0049] FIG. 8B is a front facing cross-sectional view of the apparatus of FIG. 8A.

[0050] FIG. 8C is a bottom view of the apparatus of FIG. 8A.

[0051] FIG. 9A is square shaped PID housing.

[0052] FIG. 9B is a rectangular shaped PID housing.

[0053] FIG. 9C is a cylindrical shaped PID housing.

[0054] FIG. 9D is a toroidal shaped PID housing.

DETAILED DESCRIPTION

[0055] FIG. 1 shows an existing particle impact damper (PID) 200 with a single closed metal container 222 filled approximately 90% with a plurality of tungsten balls 30A, the container 222 adhesively coupled to the geometric center 212A surface of a printed circuit board (PCB) 212.

[0056] FIGS. 2A, 2B, 2C 2D and 2E show one embodiment of a particle impact damper (PID), generally designated at 10, that holds a single particle 30. Optionally, the particle 30 can be made of tungsten. Alternatively, the particle 30 can be made of other suitable materials (e.g., other suitable metals, ceramics, powders, liquids and plastics, etc.). Optionally, the particle 30 can be cylindrical in shape. Alternatively, the particle 30 can have other suitable shapes (e.g., ovoid, rectangular rod, tube, bullet, ball etc.).

[0057] Optionally, the particle 30 can be housed (e.g., stored) inside a single chamber 50 (e.g., cylindrical chamber) as shown in FIG. 2A. Optionally, the chamber 50 can have an effective diameter 35 (e.g., measured from 35a to 35b) that is larger than the effective diameter 34 (e.g., measured from 34a to 34b) of the particle 30 as shown in FIGS. 2D and 2E.

[0058] In another implementation, a plurality of particles 30 (e.g., cylindrical rods) can be individually stored in a plurality of sealed chambers (e.g., cylindrical chambers), as shown in FIGS. 3A, 3B, 4B, 4C, 5, 6B, 6C, 7A, 7B, 8A and 8B.

[0059] The apparatus 10 can be any suitable shape, such as square (e.g., a cube with a side surface that is a square) as shown in FIG. 9A, rectangular cuboid (e.g., cuboid with a side surface that is a rectangle) as shown in FIG. 9B, cylindrical as shown in FIG. 9C, toroidal as shown in FIG. 9D, or any other suitable shape or combination of shapes. In FIG. 9D, a through hole 60 allows a shaft of a motor to enter the PID 10.

[0060] In one implementation, the particles 30 can be individually housed (e.g., stored) and sealed in a plurality of chambers 50 (e.g., cylindrical chambers) packed and arranged in any desired symmetry pattern such as, concentric radial packing, hexagonal (staggered), packing randomly packed, or square packing. Alternatively, the particles 30 can be stored any combination of symmetry or non-symmetry patterns as desired.

[0061] The PID 10 can optionally be a single particle 30 in a single chamber 50, of two-piece construction with a top plate 11 and a bottom plate 14 shown in FIGS. 2A, 2B and 2C. Top plate 11 can be coupled to bottom plate 14 by an adhesive, prepreg, fasteners or other suitable mechanism (e.g., welds) 15.

[0062] The two-piece construction PID 10 can optionally have a plurality of sealed chambers 50 (e.g., cylindrical chambers) shown in FIGS. 3A and 3B.

[0063] Optionally, PID 10 can be constructed of three or more pieces shown in FIGS. 4A, 4B, 4C and 5 with top plate 11 and bottom plate 14 coupled to middle plates 12 and 13 (or more middle plates as desired). Optionally, one or both of middle plates 12 and 13 (or more middle plates as desired) can be formed from a single piece (e.g., monolithic, with no seams) as shown in FIGS. 7A and 7B.

[0064] Exploded view FIG. 5 shows a top plate 11 and bottom plate 14 with two middle plates 12 and 13. Additional middle plates 12 and/or 13 can be added as preferred.

[0065] The top plate 11 shown in FIGS. 2A, 2B, 2C, 3A, 3B, 4A, 4B, 4C, 5 and 6B can have a top surface 20 shown in FIGS. 2A, 2B, 2C, 3A, 3B, 4A, 4B, 4C, 5, 6A, 6B, 9A, 9B, 9C and 9D that is optionally planar (e.g., flat). Alternatively, the top surface of 11 can be any shape desired.

[0066] The bottom plate 14 shown in FIGS. 2A, 2B, 2C, 3A, 3B, 4A, 4B, 4C, 5 and 8B can have a bottom surface 21 shown in FIGS. 2A, 2B, 2C, 3A, 3B, 4A, 4B, 4C, 5, 8B and 8C that is optionally planar (e.g., flat). Alternatively, the bottom surface of 14 can be any shape desired.

[0067] The bottom side 22 shown in FIGS. 6B and 6C of top plate 11 is optionally coupled to surface 23 shown in FIGS. 7A and 7B of middle plate 12 by an adhesive, prepreg, fasteners or other suitable mechanism (e.g., welds) 15 shown in FIGS. 2A, 2B, 2C, 3A, 3B, 4A, 4B, 4C, 5, 7A and 8B.

[0068] The bottom surface 24 of middle plate 12 and/or 13 (or optionally additional middle plates, as desired) is shown in FIG. 7A. Middle plate 12 and/or 13, shown in FIGS. 4A, 4B, 4C, 5 and 7A, is optionally planar (e.g., flat) or any shape as desired. The surface of middle plate 12 can be parallel to the middle plate 13 shown in FIGS. 4A, 4B, 4C and 5. Middle plate 12 can be coupled to middle plate 13 by an adhesive, prepreg, fasteners or other suitable mechanism (e.g., welds) 15.

[0069] The top surface 27 shown in FIGS. 8A and 8B of bottom plate 14 is optionally planar (e.g., flat). The bottom surface 24 of middle plate(s) 12 and/or 13 can be parallel to the bottom plate 14 coupled by an adhesive, prepreg, fasteners or other suitable mechanism (e.g., welds) 15. Alternatively, the surface of 27 can be any shape desired.

[0070] One embodiment of a single cylindrical storage chamber 50 is formed by a cylindrical northern hemisphere (e.g. top surface) outline 51 in FIGS. 2A, 2B and 2C and a cylindrical southern hemisphere (e.g., bottom surface) outline 52 shown in FIGS. 2A and 2C connected by an adhesive, prepreg, fasteners or other suitable mechanism (e.g., welds) 15. The cylindrical storage chamber 50 can optionally be filled with air in addition to one particle (e.g., tungsten cylindrical rod) 30. Alternatively, the cylindrical storage chamber 50 can be under vacuum. In another alternative, the storage chamber 50 can be filled with another gas, such as an inert gas.

[0071] Another embodiment of a plurality of storage chambers (e.g., cylindrical storage chambers) 50 is formed by a surface of a cylindrical northern hemisphere outline 51 shown in FIGS. 3A, 4C, 5, 6B, 6C and 7A and a surface of a cylindrical southern hemisphere outline 52 shown in FIGS. 3A, 4B, 4C, 5, 7A, 7B, 8A and 8B. The cylindrical chambers are formed by connecting plates 11 to 12 by welds 15 and connecting plates 12 to 13 by welds 15 and connection plates 13 to 14 by welds 15 (and so forth as desired) with an adhesive, prepreg, fasteners or other suitable mechanism (e.g., welds). The plurality of storage chambers 50 can optionally be filled with air in addition to one particle (e.g., tungsten cylindrical rod) 30. Alternatively, the storage chambers 50 can be under vacuum. In another alternative, the storage chambers 50 can be filled with another gas, such as an inert gas.

[0072] Optionally, the PID apparatus 10 has a particle (e.g. cylindrical rod) 30 having a diameter that is smaller than a diameter of the chamber 50.

[0073] Optionally, the particle 30 (e.g., tungsten cylindrical rod) has restricted unidirectional movement 31 (e.g., restricted to move only in one direction) inside the cylindrical chamber 50 as shown in FIG. 2A.

[0074] In another embodiment of the PID apparatus 10, the particle(s) 30 (e.g., cylindrical rods of tungsten or other material) have restricted freedom of movement in one direction, during any orientation, roll, pitch, yaw, attitude or position that the cylindrical chamber(s) 50 are positioned in.

[0075] The distance that the particle 30 (e.g., rods of tungsten or other material) can travel inside cylindrical chamber 50 is determined by the gap (e.g., spacing) between the outer surface of particle 30 and the inner surface wall of cylindrical chamber 50.

[0076] In one implementation, the diameter of the cylindrical chamber 50 is at least 1% larger than the diameter of the particle 30 (e.g., rods of tungsten or other material). However, the length of the cylindrical chamber can be adjusted between 7% and 25% larger than the particle 30, as desired. However, in other embodiments, the length of the chamber 50 can be less than 7% larger than the length of the particle 30 (e.g., about 6%, 5%, 4%, 3% larger).

[0077] In one implementation of the PID apparatus 10, the particle 30 (e.g., cylindrical rods of tungsten or other material) will strike the flat inside ceiling and floor of cylindrical storage chamber 50 at the instance of a vibrational event (e.g. physical movement).

[0078] The response time from the instance of a vibrational event (e.g. physical movement) that the particle 30 (e.g., cylindrical rod of tungsten or other material) in the PID 10 to a strike against the flat ceiling and floor of cylindrical storage chamber 50 is determined by the gap distance (e.g. spacing) between the surface of the ends of particle 30 and the ceiling and floor of cylindrical chamber 50.

[0079] In one implementation of the PID apparatus 10, the response time for the particle 30 (e.g., cylindrical rod of tungsten or other material) to strike the surface ceiling and floor of the cylindrical chamber 50 is increased as the length (e.g. height) of the cylindrical storage chamber 50 becomes larger in relation to the length of the tungsten rod 30. The response time for the particle 30 (e.g., cylindrical rod of tungsten or other material) to strike the surface of ceiling and floor of the cylindrical chamber 50 is decreased as the size of the cylindrical storage chamber 50 becomes shorter (e.g. smaller) in relation to the size tungsten rod 30.

[0080] Optionally, the response time of the PID apparatus 10 can be adjusted by increasing or decreasing the size (e.g. length) of the cylindrical storage chamber 50 in relation to the size (e.g. length) of the tungsten rod 30.

[0081] In one implementation of the PID apparatus 10, the particle 30 (e.g., cylindrical rod of tungsten or other material) can escape gravity when the PID apparatus 10 is coupled to the surface of a PCB board (or other planar surface as discussed above) and is subjected to an acceleration of at least 1G (e.g., gravitational G-force associated with an object relative to free-fall) and in doing so, the particle 30 can become airborne inside the cylindrical storage chamber 50 in the gap area between the outer surface of the ends of particle 30 and the inner ceiling and floor of the storage chamber 50.

[0082] Optionally, none of the particles 30 (e.g., cylindrical rods of tungsten or other material) in the PID apparatus 10 are weighed down or constrained by the mass of another particle 30 as observed in the prior art. Accordingly, the PID 10 advantageously provides a quicker response time for the particles 10 (e.g., cylindrical rods of tungsten or other material) to strike the ceiling and floor of the storage chamber 50 upon the instantaneous onset of a vibrational response, thereby providing a PID 10 with a faster vibration response that advantageously can dissipate vibration forces more quickly than existing Ms.

[0083] The particle(s) 30 (e.g., cylindrical rod of tungsten or other material) will strike the inside ceiling and floor of cylindrical storage chamber(s) 50 in the opposite direction of the movement (e.g. bending) of the PCB board according to Newton's third law: For every action, there is an equal and opposite reaction.

[0084] In the PID apparatus 10, the collective momentum of a plurality of particles 30 (e.g., cylindrical rods of tungsten or other material) will optionally strike the flat inside ceiling and floor of a plurality of cylindrical storage chambers 50 with sufficient force as to dampen the flexible movement (e.g., bending) when the PID apparatus 10 is coupled to the surface of the PCB or other planar surface.

[0085] While certain embodiments of the inventions have been described, these embodiments have been presented by way of example only and are not intended to limit the scope of the disclosure. Indeed, the novel methods and systems described herein may be embodied in a variety of other forms. Furthermore, various omissions, substitutions and changes in the systems and methods described herein may be made without departing from the spirit of the disclosure. The accompanying claims and their equivalents are intended to cover such forms or modifications as would fall within the scope and spirit of the disclosure. Accordingly, the scope of the present inventions is defined only by reference to the appended claims.

[0086] Features, materials, characteristics, or groups described in conjunction with a particular aspect, embodiment, or example are to be understood to be applicable to any other aspect, embodiment or example described in this section or elsewhere in this specification unless incompatible therewith. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive. The protection is not restricted to the details of any foregoing embodiments. The protection extends to any novel one, or any novel combination, of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.

[0087] Furthermore, certain features that are described in this disclosure in the context of separate implementations can also be implemented in combination in a single implementation. Conversely, various features that are described in the context of a single implementation can also be implemented in multiple implementations separately or in any suitable subcombination. Moreover, although features may be described above as acting in certain combinations, one or more features from a claimed combination can, in some cases, be excised from the combination, and the combination may be claimed as a subcombination or variation of a subcombination.

[0088] Moreover, while operations may be depicted in the drawings or described in the specification in a particular order, such operations need not be performed in the particular order shown or in sequential order, or that all operations be performed, to achieve desirable results. Other operations that are not depicted or described can be incorporated in the example methods and processes. For example, one or more additional operations can be performed before, after, simultaneously, or between any of the described operations. Further, the operations may be rearranged or reordered in other implementations. Those skilled in the art will appreciate that in some embodiments, the actual steps taken in the processes illustrated and/or disclosed may differ from those shown in the figures. Depending on the embodiment, certain of the steps described above may be removed, others may be added. Furthermore, the features and attributes of the specific embodiments disclosed above may be combined in different ways to form additional embodiments, all of which fall within the scope of the present disclosure. Also, the separation of various system components in the implementations described above should not be understood as requiring such separation in all implementations, and it should be understood that the described components and systems can generally be integrated together in a single product or packaged into multiple products.

[0089] For purposes of this disclosure, certain aspects, advantages, and novel features are described herein. Not necessarily all such advantages may be achieved in accordance with any particular embodiment. Thus, for example, those skilled in the art will recognize that the disclosure may be embodied or carried out in a manner that achieves one advantage or a group of advantages as taught herein without necessarily achieving other advantages as may be taught or suggested herein.

[0090] Conditional language, such as can, could, might, or may, unless specifically stated otherwise, or otherwise understood within the context as used, is generally intended to convey that certain embodiments include, while other embodiments do not include, certain features, elements, and/or steps. Thus, such conditional language is not generally intended to imply that features, elements, and/or steps are in any way required for one or more embodiments or that one or more embodiments necessarily include logic for deciding, with or without user input or prompting, whether these features, elements, and/or steps are included or are to be performed in any particular embodiment.

[0091] Conjunctive language such as the phrase at least one of X, Y, and Z, unless specifically stated otherwise, is otherwise understood with the context as used in general to convey that an item, term, etc. may be either X, Y, or Z. Thus, such conjunctive language is not generally intended to imply that certain embodiments require the presence of at least one of X, at least one of Y, and at least one of Z.

[0092] Language of degree used herein, such as the terms approximately, about, generally, and substantially as used herein represent a value, amount, or characteristic close to the stated value, amount, or characteristic that still performs a desired function or achieves a desired result. For example, the terms approximately, about, generally, and substantially may refer to an amount that is within less than 10% of, within less than 5% of, within less than 1% of, within less than 0.1% of, and within less than 0.01% of the stated amount. As another example, in certain embodiments, the terms generally parallel and substantially parallel refer to a value, amount, or characteristic that departs from exactly parallel by less than or equal to 15 degrees, 10 degrees, 5 degrees, 3 degrees, 1 degree, or 0.1 degree.

[0093] The scope of the present disclosure is not intended to be limited by the specific disclosures of preferred embodiments in this section or elsewhere in this specification, and may be defined by claims as presented in this section or elsewhere in this specification or as presented in the future. The language of the claims is to be interpreted broadly based on the language employed in the claims and not limited to the examples described in the present specification or during the prosecution of the application, which examples are to be construed as non-exclusive.