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Jet Lag Fighting Glasses 2.0
The final design for the Jet Lag Fighting Glasses was based off the Wayfarer sunglasses design, but each of the following three components have been revamped in order to accomplish the goal of creating smart sensing eyewear: 1) Front Frames, 2) Left Temple, and 3) Right Temple.
Firstly, the front frames have been designed to come together from two separate shells. The primary purpose of this is to allow the wiring that runs across the glasses to fit nicely within the internal volumes provided by the two shells. Furthermore, the LEDs have been strategically placed within the sliding section of the front frame so that they can be shined directly across the wearer’s brow, as seen in Figure 1. The brow bar serves the dual purpose of preventing light from escaping and also allowing the LED light to diffuse across it.
Treecheck
One of the most important things to keep in mind while doing this project is designing a case that can be easily manufactured. The following images are a full assembly of the design. Each of these components will the be broken down to explain the major design features.
The lid attaches to the designed base c-clamp by two cantilever snaps on the sides of the lid. The front of the lid is angled at 42.1° to deflect a direct strike from a hammer while the sides and back of the lids have drafts of 17° that reduces the size of the lid and is necessary for the injection molding process. The lid has a thickness of 0.06” and has ribs on the inside for added support. In order to prevent shrinkage, the rib thickness was calculated to be 0.036”, which is 60% of the thickness of the walls.
Figure 2: Top View of Left Temple
Lastly, the right temple showcases a similar outer design with a different internal geometry. Unlike the left temple, the right temple holds a battery with entirely different shape characteristics. The battery is more rectangular and will occupy a slightly larger space, and because wires will be running from the battery leads to the rest of the glasses, tunnels have been carved to keep the wires in place and secure, as seen in Figure 3.
The left temple houses the primary circuit board, on which sits the button and microUSB. The internal geometry of the temple was carefully designed to fit the circuit board, with guides running along the surface of the internal surfaces to secure the circuit board.
Figure 1: Front Frame Shells
Figure 3: Top View of Right Temple
The end product is the combination of these three components put together.
Main Individual Components
Lid
Deflects force of hammer
Ribbing for extra support
Designed for injection molding
Leaves room for branding
Has a hole for the RJ11 phone jack so a wire can easily be connected and removed
Figure 4: Orthogonal View of Jet Lag Glasses 2.0
Base
Keep out space for cheap manufacturing
C-clamp to fit many sized wood screws
Allows circuit board to be slid in and glued
Designed for extrusion method
Circuit board
The following images are the dimensions of the circuit board to show the parameters the team had to design around
The material of the board is FR4 to reduce PCB flex
Conformal coating is sprayed on top to protect the circuit board components
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