Machines that utilize pressure may include a pressure gauge to monitor pressure. One such machine is a sputter machine for production of magnetic media for hard disk drives. Sputter machines include multiple sputter chambers, which are under pressure during operation (sputter deposition). A conventional pressure gauge may be coupled to a sputter chamber to measure the pressure of the sputter chamber. The pressure sensor may be connected to a manufacturing computer to provide real time pressure measurements. However, during magnetic media production, the sputter chamber can experience vibration. One source of the vibration can be due to a carrier holder traveling from one sputter chamber to the next. Another source of the vibration can be a gate valve assembly opening and closing. This vibration may result in the pressure gauge proving a false reading, which can even lead to stopping the sputter chamber operation.
Thus, there is a need in the art for a pressure gauge for use with a sputter chamber that prevents false readings due to vibration originating from the sputter chamber.
Various aspects of the present invention will now be presented in the detailed description by way of example, and not by way of limitation, with reference to the accompanying drawings, wherein:
The detailed description set forth below in connection with the appended drawings is intended as a description of various exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form in order to avoid obscuring the concepts of the present invention. Acronyms and other descriptive terminology may be used merely for convenience and clarity and are not intended to limit the scope of the invention.
The various aspects of the present invention illustrated in the drawings may not be drawn to scale. Rather, the dimensions of the various features may be expanded or reduced for clarity. In addition, some of the drawings may be simplified for clarity. Thus, the drawings may not depict all of the components of a given apparatus or method.
The word “exemplary” is used herein to mean serving as an example, instance, or illustration. Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments. Likewise, the term “embodiment” of an apparatus, method or article of manufacture does not require that all embodiments of the invention include the described components, structure, features, functionality, processes, advantages, benefits, or modes of operation.
Any reference to an element herein using a designation such as “first,” “second,” and so forth does not generally limit the quantity or order of those elements. Rather, these designations are used herein as a convenient method of distinguishing between two or more elements or instances of an element. Thus, a reference to first and second elements does not mean that only two elements can be employed, or that the first element must precede the second element.
As used herein, the terms “comprises,” “comprising,” “includes,” and/or “including,” when used herein, specify the presence of the stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof
In the following detailed description, various aspects of the present invention will be presented in the context of apparatuses and methods for measuring pressure in a sputtering system (e.g., a sputter chamber of the sputtering system) used to produce magnetic media for hard disk drives (HDD). However, those skilled in the art will realize that these aspects may be extended to any suitable application where it is desirable to accurately measure pressure of a chamber with a pressure gauge when vibration originates from the chamber (e.g., to avoid a false reading in a pressure gauge due to pressure originating from the chamber). Accordingly, any reference to a measuring pressure of a sputter chamber of a sputtering system used to produce magnetic media for an HDD is intended only to illustrate the various aspects of the present invention, with the understanding that such aspects may have a wide range of applications.
The vibration dampening assembly 24 may include an air conduit 17, a ring member 16, a clamp member 15a, 15b, and a base member 14. The air valve 12 and pressure sensor 13 may be connected to each other through the air conduit 17. As shown in
The ring member 16 may be coupled with pressure sensor 13 and may be configured to further reduce vibration at the pressure sensor 13. The ring member 16 may be made from any suitable material that is capable of dampening vibration at the pressure sensor. For example the ring member 16 may comprise a sponge material. As shown in
The ring member 16 may be secured around the pressure sensor 13 by the clamp member 15a, 15b. The clamp member may include a first portion 15a, and a second portion 15b. Each of the first portion 15a and the second portion 15b may be curved to correspond to the curvature of the ring member 16. As shown in
The base member 14 may further include a seat 18 for receiving the underside surface of the air valve 12. The air valve 12 may include a body 29 that houses the flow path. As shown in
As shown in
The length of the free end portion 19 and location of the cutouts 20 may be configured such that the cutouts 20 are aligned with the flange 11 to provide stable engagement of the base member 14 with the flange 11. As shown in
While only one pressure gauge 10 is shown as being coupled with the sputter chamber 30, it should be understood that more than one pressure gauge 10 may be coupled with the sputter chamber 30 via another ring 32. For example, a second pressure gauge (or more) may provide a backup measurement if another pressure gauge fails, or may ensure that the other pressure gauge (or gauges) is running properly. For example, if two pressure gauges are providing different pressure measurements then this may indicate that one of the gauges is not working properly.
After the pressure gauge 10 is secured to the vacuum chamber 30, the method may proceed to step 42, dampening vibration in the pressure gauge 10 with the vibration dampening assembly 24. As noted above, during operation of the sputter chamber, vibrations may be produced that may propagate into the pressure gauge. Thus, the dampening assembly 24 dampens these vibrations to prevent the vibrations from interfering with reading of the pressure sensor 3. The vibration may be dampened at least in part by the bellows 26 surrounding the tube 22. The vibration may further be dampened by the ring member being secured around the circumferences of the pressure sensor 13.
The method may then proceed to step 44 of obtaining a pressure measurement from the pressure sensor. Because the vibration has been dampened by the dampening assembly, the pressure sensor is more likely to provide an accurate pressure reading.
The method may further include repeating the steps of dampening the vibration and obtaining the pressure reading periodically. The obtained pressure measurement may be monitored by a computer controller. The computer controller may be configured to report an alert if an obtained pressure measurement is higher or lower than a predetermined acceptable range. The pressure measurement may be obtained on a constant basis by the computer controller so that a “real time” measurement is always available and so that an alert can be generated immediately if the measured pressure falls outside of the predetermined range.
The various aspects of this disclosure are provided to enable one of ordinary skill in the art to practice the present invention. Various modifications to exemplary embodiments presented throughout this disclosure will be readily apparent to those skilled in the art, and the concepts disclosed herein may be extended to other devices. Thus, the claims are not intended to be limited to the various aspects of this disclosure, but are to be accorded the full scope consistent with the language of the claims. All structural and functional equivalents to the various components of the exemplary embodiments described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. No claim element is to be construed under the provisions of 35 U.S.C. §112(f) unless the element is expressly recited using the phrase “means for” or, in the case of a method claim, the element is recited using the phrase “step for.”
This application claims the benefit of U.S. Provisional Application Ser. No. 61/916,704, filed on Dec. 16, 2013, which is expressly incorporated by reference herein in its entirety.
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Number | Date | Country | |
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