SLAAEK6 June   2024 ULC1001 , ULC1001-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Acronyms
  5. 2Introduction
  6. 3Design Principles
    1. 3.1 Critical Acceleration
    2. 3.2 LCS Architecture
    3. 3.3 Design Procedure
    4. 3.4 Design of Components
      1. 3.4.1 Lens
      2. 3.4.2 Transducer
      3. 3.4.3 Thin Film
      4. 3.4.4 Glue Fixture
      5. 3.4.5 Housing
        1. 3.4.5.1 Housing Cap
        2. 3.4.5.2 Flexible Seal
        3. 3.4.5.3 Housing Base
  7. 4Fabrication Principles
    1. 4.1 Lens
    2. 4.2 Transducer
    3. 4.3 Thin Film
    4. 4.4 Glue Fixture
    5. 4.5 Housing
  8. 5Assembly Principles
    1. 5.1 Step 1: Gluing Components into Lens Cover
    2. 5.2 Step 2: Soldering of Lens Cover with Wires
    3. 5.3 Step 3: Assemble Lens Cover into Housing
  9. 6Example: CAD Drawings for Aperture = 15mm
  10. 7Resources

5.2 Step 2: Soldering of Lens Cover with Wires

Materials and tools for the procedure include:

  1. Rosin flux
  2. Lead-free solder wire
  3. Thin and flexible wire for piezo
  4. Hot glue sticks
  5. Hot glue gun

Note:

TI recommends 30AWG stranded wire with silicone as the insulator. Wires using the PVC insulator can be too stiff and negatively affect the piezo vibration

Below is the soldering procedure:

  1. Solder the flexible wire to the two plates of the transducer. Use lead-free solder wire and Rosin flux. The soldering iron tip does not heat the transducer surface. Hence the tip only contacts the transducer for 1-2 seconds.
  2. Apply the hot glue on the solder joint to hold the solder on the surface. Without the hot glue, the solder joint can come off during the long-term vibration.
  3. Record the impedance response of the transducer using an impedance analyzer. This data can be used to verify the transducer assembly after the gluing process.
Note: The soldering process is quick with a temperature of 650F. A high temperature or long soldering can damage the transducer.