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

3.4.3 Thin Film

As the interface between the Lens Cover and Housing, the flexible polyamide is chosen. The reasons why choosing polyamide film as the interface include the following:

  • Very flexible with a flexural modulus of 2.5GPa to reduce damping.
  • High tensile strength of up to 340MPa.
  • Excellent thermal stability, normal use in -100°C to 260 °C.
  • Different thicknesses are available with 10um – 1000um.
  • Low cost and easy to pattern.
  • Other materials (Al, SS, film, nylon, plastic, etc) can be potentially used.

Figure 3-8 shows the top view, side view and isometric view of the thin film in the application. The pattern is so that the inner diameter (F_D2) is identical to the inner diameter of the piezo transducer. Four small holes are designed for screwing purpose.

Thin Film: Top View, Side View and Isometric View Figure 3-8 Thin Film: Top View, Side View and Isometric View