IC349 MU-IPD04

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Multi-touch Table

Introduction

Touch- screen display has been using for many products. In this project, it is decided to design a table with touch- screen display that used in café. IR technique will be applied to the display. In order to obtain the optimum design of the table, several factors including optical path of LED light, internal construction of the table, material selection etc. are considered.

In this project, we were required to design and a table with a 30” multi-touch display that would be used in café. Frustrated Total Internal Reflection (FTIR) technique would be applied on the display. Other than the look of the table, detailed designs like the optical path of LED light, internal construction of the table, material selection were considered in the design stage. When it came to manufacturing stage, a prototype would be built and presented based on the design concept.

 

Objectives

In this project, details on design stage would be presented in the first section, including research findings, calculations on optical paths and reflection of mirrors, conceptual designs and the finalized design.

Details on manufacturing stage would be covered in the second section, including testing, engineering drawings, workflow, manufacturing of components, assemble of table, problems tackling, and conclusion.

CalculationThe first stage of the project it calculation, with the measurement of projector and camera, and the design of optical path. The angles of the optical path were collected, sketched and calculated with the help of SolidWorks. With these data, we designed the optical path of our multi-touch table with the reflection of mirrors.

ResearchIn the stage of research, the group members searched on the internet, in order to find ways to implement the multi-touch function, make better design, draw lessons from existing products, and fulfill customers' needs. After some study, FTIR system was chosen to make the multi-touch screen. And with an overall consideration, we decided to make a multi-touch coffee table, which allows users to play and share things on it.

Design In the early stage of the project, we made definition of the multi-touch table. Several designs were born by the brainstorming of the group mates. And according to the designed optical path, a combined design was made and developed, considering the marketing condition, user-friendly and ergonomics. The final design was a coffee table for 2 or 3 people to use.

Material Selection Suitable materials were selected for different components. In the selecting stage, cost, property were both considered. Acrylic was chosen to be the screen; Aluminium alloy was chosen for the screen frame; Mild steel angle bars were chosen for the supporting frame and table frame.

Components DetailThe multi-touch table we made contains three parts: the screen, the screen frame, the top frame, the table frame, the top covers and the side covers.

ManufactureIn the stage of manufacture, we made the raw materials into final product components according to the engineering design drawings. Components were produced in different workshops in IC. Several manufacture processes were covered: laser cut, milling, polishing, shearing, photo chemical machining, sawing, welding, CNC punching, bending, and painting.

Assembly After all the components were made, they needed to be assembled together. The connection were made by pop-rivets, screws, and locks. Mirrors were put on the frame, the camera was adhere on the projector, and the top and base frame needed to be adjusted to mate together.

Review During the manufacture and assemble process, we viewed and examined everyday to test if there were any tolerance. We faced a number of problems and tried to fix them. The Acrylic board were too large in size to be polished by the polishing machine; the angle bars of the table frame had some tolerance that might affect the whole structure; The etched lines made by PCM of the screen frame were not parallel; The welding process had made some errors; the spraying of the cover plate was not uniform enough...These problems were solved with our creativity and the help of our supervisors.

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