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Design of a flash light. Even though this device is so simple but in this design there are four major problems:

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Introduction

A Poor Design: Flashlight A flashlight consists of a battery, a switch, and a lamp. Simply the switch (user control) and the battery are the inputs of this system and the light, and some heat, are the outputs. This circuit is then placed inside a case and a reflector is mounted at the back of the lamp to direct the light into the object. Figure1: Flash light shown from 4 different angles. The cubic shape of the flashlight makes it uncomfortable to carry. 1. The Problem: Even though this device is so simple but in this design there are four major problems: * Cubic shape of the flashlight * Poor choice of On/Off switch * Flat Reflecting mirror * Non-rechargeable and non-standard battery Shape: Maybe the most important characteristic that every flashlight must have is to be comfortable in hand. ...read more.

Middle

After a while your thumb gets tired and you may require to switch hands or even worse, keeping the light on will become a two hand operation such that one hand must hold the light and the other must push the switch. Reflector Mirror: the mirror used in this design is flat instead of being concave and it can not focus the light on desired object properly. Battery: The battery used in this device is not rechargeable nor it is one the standard type of batteries you can find in a store (such as AA or AAA). Instead there is a black cubic shape battery with no information written on it. ...read more.

Conclusion

Since the fingers tend to curl, it will be much easier to hold and carry around a cylinder compared to a cube. 3.2: Switch: It must not be a momentary switch. That is it must stay on without any need to keep pressure on it. 3.3: Reflector Mirror: It should be concave so that it can focus the light on desired object. Since the intensity of the light is not that much in this case we want to reflect all the light rather than letting it "waste" through the sides of the light bulb. 3.4: Standard Battery: Standard rechargeable battery must be used so we can recharge or change the battery if it dies. In addition, recharger handle can be added such that by rotating the handle the battery gets charged. ?? ?? ?? ?? ENSC 304: Assignment 1, January 29, 2008 ...read more.

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