# US 5,708,540 A · Slider for inhibiting stiction and with backbar > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,708,540 A - Document ID: US5708540A - Status: Granted - Kind: A - Application number: 08/575,440 - Filed: 1995-12-20 - Granted: 1998-01-13 - Earliest claimed: 1984-11-13 - Assignees: Unisys Corporation - Inventors: Raju S. Ananth; Michael A. Verdone - Web page: https://patentgrep.com/patent/US5708540A ## CPC - G11B 5/54: with provision for moving the head into or out of its operative position or across tracks - G11B 5/6005: {Specially adapted for spacing from a rotating disc using a fluid cushion} - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## Abstract Salient embodiments comprise magnetic recording sliders whose record-confronting face is characterized by two or three rails wherein stiction forces are counter-acted by provision of "boss means" on one or several rails, or therebetween; and also characterized by provision of "back-bar means" and associated purge channel means; and methods for rendering such are also described. ## Claims ### Claim 1 An improved magnetic disk recording slider means which includes back bar means plus disk-confronting slider face portions for defining a prescribed "flight-plane" in their moving transducing mode, this slider means including: anti-stiction boss means disposed on disk-confronting face portions so as to space said face portions at, or somewhat beyond this "flight plane", and to thereby reduce "stiction", when it is "landing", or is "taking-off" or when it is "at rest" on an associated disk. ### Claim 2 (depends on 1) The invention of claim 1, wherein said boss means is made to project up to twenty micro-inches beyond said "flight plane". ### Claim 3 An improved magnetic disk recording slider means, including back bar means plus anti-stiction boss means disposed on certain areas of one or more disk-confronting face portions of said slider means; while adapting and arranging said boss means, for spacing said face portions from a subject disk, to be projected, at least sufficient to inhibit said slider face portions from "stiction" with an associated disk surface. ### Claim 4 An improved magnetic recording slider means which has at least one disk-confronting face for resting upon, and interacting with, the lubricated surface of a magnetic recording disk, said slider means including: back bar means disposed on an aft portion of said face, plus one or more boss means disposed on certain portions of said disk-confronting face, said boss means adapted and arranged to project toward a subject magnetic recording disk only just sufficient to space said face from the disk to alleviate stiction and related problems. ### Claim 5 An improved magnetic recording slider means which has a disk-confronting face defining the slider "flight-plane" plus back bar means on aft portions of said face, said slider means also including anti-stiction boss means disposed on certain portions of said disk-confronting face; said boss means being sufficiently high to extend slightly beyond said "flight-plane". ### Claim 6 (depends on 5) The invention of claim 5, wherein said boss means is made to extend up to twenty micro inches beyond the said flight plane. ### Claim 7 An improved magnetic recording slider means which has at least one disk-confronting face adapted to rest upon, and interact with, the surface of a magnetic recording disk, with back bar means disposed on an aft portion of said face, said slider means also comprising: one or more like boss means disposed only on certain portions of each said disk-confronting face, and made part thereof; and being arranged to project toward a subject magnetic recording disk, sufficient to space the face from the disk and improve the "rest" condition thereof. ### Claim 8 An improved magnetic recording slider means having at least one disk-confronting face defining the slider "flight-plane", with back bar means disposed on an aft portion of said face, this slider means also including anti-stiction boss means on each said disk-confronting face, said boss means being disposed and adapted for spacing said face from a subject disk, and made to exhibit a height which extends beyond said "flight-plane". ### Claim 9 (depends on 8) The invention of claim 8, wherein said boss means is so extended just sufficient to relieve "high stiction" conditions. ### Claim 10 (depends on 8) The invention of claim 8, wherein said boss means is made to be so extended sufficient to improve the interaction of said disk-confronting face with the disk surface when the said magnetic recording slider means is "landing" or is "taking-off" or is "at rest" on an associated disk. ### Claim 11 (depends on 8) The invention of claim 8, wherein said boss means is made to be so extended up to a few micro inches beyond the said "flight plane". ### Claim 12 An improved magnetic disk recording slider means, this slider means comprising anti-stiction boss means disposed on at least one disk-confronting slider means air bearing surface said boss means being disposed and adapted for spacing said surface from a subject disk by projecting only very slightly beyond said air-bearing-surface, just enough to counteract stiction forces, said surface also including back bar means on an aft portion thereof. ### Claim 13 (depends on 12) The invention of claim 12, wherein said boss means is arranged to project away from said surface at least sufficient to give the slider means a prescribed "pitch bias" when at rest on an associated disk surface .