Apparatus for generating linear vibration with damper and damper

{
  "publication_number": "US9742254B1",
  "country": "US",
  "kind": "B1",
  "title": "Apparatus for generating linear vibration with damper and damper",
  "abstract": "Disclosed is an apparatus for generating linear vibration with a damper, which includes a housing having an inner space formed therein, a fixed body provided in the inner space and having a coil, a vibrating body having a magnet and a weight coaxially disposed with the coil and configured to move in a vertical direction on the basis of the fixed body, an elastic body configured to elastically support the vibrating body, a viscous fluid provided at an upper surface of the magnet and having viscosity, and a damper installed in the housing to face an upper surface of the vibrating body and configured to make a surface contact with the viscous fluid when the vibrating body moves upwards, the damper having a shape not making a surface contact with the entire viscous fluid simultaneously.",
  "claims": [
    "1. An apparatus for generating linear vibration with a damper, comprising: a housing having an inner space formed therein; a fixed body provided in the inner space and having a coil; a vibrating body having a magnet and a weight coaxially disposed with the coil and configured to move in a vertical direction on the basis of the fixed body; an elastic body configured to elastically support the vibrating body; a viscous fluid provided at an upper surface of the magnet and having viscosity; a damper installed in the housing to face an upper surface of the vibrating body and configured to make a surface contact with the viscous fluid when the vibrating body moves upwards, the damper having a shape not making a surface contact with the entire viscous fluid simultaneously, and the damper has a surface-contact part making a surface contact with the viscous fluid and one or more spaces not making a surface contact with the viscous fluid, which are simultaneously formed in a region corresponding to the viscous fluid.",
    "2. The apparatus for generating linear vibration with a damper according to claim 1, wherein the viscous fluid is a magnetic fluid.",
    "3. The apparatus for generating linear vibration with a damper according to claim 1, wherein the damper is shaped symmetrically on the basis of a center portion thereof.",
    "4. The apparatus for generating linear vibration with a damper according to claim 1, wherein the damper is configured so that a distance from a center portion thereof to an outermost portion thereof is greater than a distance from a central axis of the magnet to an outer circumference of the magnet.",
    "5. The apparatus for generating linear vibration with a damper according to claim 1, wherein the damper has two or more protrusions shaped radially or symmetrically on the basis of a center portion thereof.",
    "6. The apparatus for generating linear vibration with a damper according to claim 1, wherein the damper has one or more grooves formed at a location corresponding to the viscous fluid.",
    "7. The apparatus for generating linear vibration with a damper according to claim 1, wherein the damper has at least one convex portion and at least one concave portion repeatedly formed at an outer circumference thereof.",
    "8. A damper for an apparatus for generating linear vibration, comprising: a housing having an inner space formed therein, a fixed body provided in the inner space and having a coil, a vibrating body having a magnet and a weight coaxially disposed with the coil and configured to move in a vertical direction on the basis of the fixed body, an elastic body configured to elastically support the vibrating body, and a viscous fluid provided at an upper surface of the magnet and having viscosity, wherein the damper is installed in the housing to face an upper surface of the vibrating body and configured to make a surface contact with the viscous fluid when the vibrating body moves upwards, and the damper has a shape not making a surface contact with the entire viscous fluid simultaneously, and the damper has a surface-contact part making a surface contact with the viscous fluid and one or more spaces not making a surface contact with the viscous fluid, which are simultaneously formed in a region corresponding to the viscous fluid.",
    "9. The damper for at an apparatus for generating linear vibration according to claim 8, wherein the damper has two or more protrusions shaped radially or symmetrically on the basis of a center portion thereof."
  ],
  "description_excerpt": "The present disclosure relates to a damper and an apparatus for generating linear vibration with the damper, and more particularly, to an apparatus for generating linear vibration (hereinafter, also referred to as a linear vibration generating apparatus) capable of effectively preventing unnecessary noise generation and performance deterioration by improving a shape of a damper included in a linear vibration generating apparatus (or, a linear-vibrating motor) so that the damper does not simultaneously make a surface contact with front surfaces of a viscous fluid and a magnetic fluid, and a damper applied to the apparatus.\n\nA mobile terminal such as a smart phone has a vibration function (or, a haptic function) for not only interfacing the receipt of a call but also interfacing for feeding back a key input, an occurrence of an event, execution of an application or the like to a user.\n\nA vibration motor (or, a vibration generating apparatus) implementing such a vibration function converts energy obtained by an electromagnetic action into a vibration energy and is generally classified into a linear-type vibration motor and a flat/coin-type vibration motor depending on an operating way or pattern.\n\nThe flat/coin-type vibration motor has a behavior characteristic in which an inertia remains due to rotation, and thus a linear vibration generating apparatus having no rotation inertia is generally used when a rapid response speed is demanded.",
  "cpc": [
    "H02K 33/00",
    "G06F 3/016",
    "H01F 1/44",
    "H02K 33/02",
    "H02K 33/16",
    "H02K 5/24"
  ],
  "ipc": [
    "H02K 33/00"
  ],
  "assignees": [
    "Jahwa Electronics Co Ltd"
  ],
  "inventors": [
    "Nam Jin Choi",
    "Kyung Hoon Jo",
    "Soon Koo Shim",
    "Young Bin Chong",
    "Won Gook Lee",
    "Min Goo Lee"
  ],
  "filing_date": "2016-11-10",
  "publication_date": "2017-08-22",
  "grant_date": "2017-08-22",
  "priority_date": "2016-08-18",
  "application_number": "US-201615347922-A",
  "family_id": "57835390",
  "cited_by_count": 9,
  "citations": [
    "KR20070087523A",
    "JP2007275695A",
    "US20100277010A1",
    "US20110193426A1",
    "KR20150053104A",
    "KR20150053106A"
  ]
}