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Rear Tesa 8854 artwork

The manually maintained left master includes rear tape documentation on User.2, named psb_tesa8854. These are closed, unfilled 0.05mm contours; nested contours alternate coverage and holes. They are independent of copper, coverlay openings and Edge.Cuts. The generator reflects/places the saved artwork with each ear and exports filled positive coverage as psb_tesa8854.gbr, included in each matching Gerber ZIP and Gerber job. The plot retains the other layers' origin and top-view coordinates; do not mirror this file separately.

The 2026-10-27 cleanup retains a nominal 5mm-wide outer strip, spanning 0.5–5.5mm inward from the exterior, and the 3mm island ring. The outer LED centres sit approximately 3.4mm from the long/short edges, so this strip supports the LEDs and bonds most of the electrode area to the backing fabric. Retaining the wider bond area is a mechanical choice; no through-fur sensing advantage is claimed for covering or avoiding the electrodes. The connector cutout remains an intentional exception to the fixed strip width. The tape follows the new island corner and moat joins, with exactly two connected adhesive regions. The approved profile rebuilds the island ring from the accepted outline, closing its notional boundary across B. The outer strip and connector opening are retained. The subsequent covered-electrode revision closes the three former wire-pad access notches, adding 15.546mm² of tape within the existing 0.5–5.5mm strip envelope. The electrodes have no solder openings; their copper-only net anchors can sit underneath the tape.

Historical geometry originally authorised on 2026-10-25 (wire-pad cutouts are superseded by the covered-electrode revision above):

The later B-only pocket adoption removes A and rebuilds the island's 3mm tape ring around its R1mm lower-left corner, retaining the 0.5mm cut-edge setback. The main perimeter strip and connector/wire-pad clearances are preserved. The earlier order ZIPs have not been regenerated.

  • Approximately 3mm-wide inner-island perimeter ring, 0.5mm inside the cut edge.
  • Main perimeter strip held within 5.5mm of the exterior board edge, with a 0.5mm outside-edge setback. Inner corners have approximately 0.5mm relief; the connector-side tape ends have approximately 0.25mm corner rounding.
  • No bumps extending up the remaining island bridge. The island's notional boundary joins the moat edges across B's mouth.
  • 1mm clearance from J1's rear courtyard, open towards the baseline for connector/actuator and FFC access, plus 0.6mm clearance around T1/T2/T3 copper so the exposed manual wire pads remain accessible.

The contour approximation is at most about 0.001mm. Saved readback checks allow 0.005mm clearance tolerance and independently check the final tape regions, physical connector/wire-pad clearances, reflected/placed coverage and actual filled Gerber boundaries/holes. The copper, numbered pads, LED/capacitor/J1 placements, outline and moats are held. This tape is adhesive backing, not a connector stiffener.

JLC's FPC stiffener and adhesive guide specifies psb_* for rear adhesive artwork; its flex capabilities list Tesa 8854 at 0.1mm. Tesa's product specification lists 100µm total tape thickness (sources checked 2026-10-25). This is additional tape thickness, separate from the requested nominal 0.12mm nominal / 0.5oz-per-side flex and its matching saved CAD stack. Actual white coverlay may make the finished flex thicker. The ear-stack contract owns these values. Supplier acceptance, application/registration, release liner, actual fabric adhesion and installation bending remain physical/process checks.

The 2026-10-25 AW routing refinement trims the existing connector cutout to 1.005mm outside J1's current rear courtyard after Andi's manual rotation to -166 degrees. The rest of the tape coverage is held.