Group 33 - Polaroid Camera
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Revision as of 14:57, 8 December 2006
Contents |
Group Members
Shoaib Alam - Presenter / Website Creator
Toshifumi Kawashima - CAD Drawings
Suguru Nakamura - Presenter
Gregory Berkowitz - Presenter / Assembly & Disassembly
Ritwik Saha - Assembly & Disassembly
Aim of the Project
The aim of this project is to disassemble a 35mm Polaroid disposable camera and to then reassemble the parts while reporting observations. Cad drawings are going to be used to show certain, important parts of the camera. After observing how the different components work in the camera, improvements will be suggested.
Description
The product is a one-time use disposable, camera with flash manufactured by Polaroid. Majority of its parts, being made of ABS Plastic and by injection molding.
Use/Purpose
•Take cheap quality pictures
•Negates the need to buy an expensive camera
•Prevents damage to an expensive camera when conditions are harsh
How It Works?
The disposable camera is all mechanical with no electrical components. The exception is the flash, where a circuit board and battery are included. That is the only part of the camera which is powered by a battery (i.e.: chemical energy from the battery changes to electrical energy, which powers the flash).
•When the flash button is pressed the battery charges the capacitor so the flash can be used.
•Once charged you can now press the shutter button which opens up a pin hole (shutter) to expose the film to light. Not only does the shutter button do this but it also sends the charge to the bulb allowing the xenon gas filled bulb to flash
•Now that the film has been exposed to light the shutter closes and the picture has been captured
•Now that the picture has been taken you can advance your film to take another picture
•The film advance gear consists of 3 rotating sprockets spin and in turn move the film forward
Steps of Disassembly
The following where the main features noticed during the disassembly process.
•Remove the cardboard covering.
•Remove 1 screw which held the back and the casing together. The screw was located beneath the view finder.
•Then we seperated the back and the front covers, which were fastened by Plastic fasteners.We also observed that these plastic fasteners were used extensively throughout the camera to keep components locked to each other. We figured it was a good way to reduce production cost.
•We had to take out the battery to prevent short circuit, and for safety purposes.
•We then took out the cover which protected the film housing, and then took out the film.
•Then we popped out the view finder.
•To have a closer look at the circuit board, we had to remove it by unscrewing the smaller screws were used to keep the circuit board in place
•After taking out the circuit board we could have a closer look at the spring amd sprocket component in the camera. which rolled the film and changed the film count, using gears.
•Black Plastic cover was used to keep light out, so that it wouldn't damage the film.
Outer Components
The Front Exterior of The Camera
The outer casing is made of ABS plastic, and manufactured thru Injection Molding. As shown in the picture, The front exterior houses 7 major components, namely:
•View Finder: The user sees the scene for the picture thru this.
•Flash: It is powered by the battery.
•Flash Button: It charges the Flash with the power from the battery.
•Lens: It lets the light in, and the shutter, placed behind the lens, exposes that light to the film.
•Lens Holder: It keeps the lens in place
•Film Casing: the lid for the film
•Film Advance Wheel: it rolls up film into the "Film Canister" and clicks off numbers on the "Frame Counter."
The Back Exterior of The Camera
The outer casing is made of ABS plastic, and manufactured thru Injection Molding. As shown in the picture, The back exterior houses 2 major components, and 1 feature.
•View Finder: The user sees the scene for the picture thru this.
•Film Advance Wheel: it rolls up film into the "Film Canister" and clicks off numbers on the "Frame Counter."
•Grip: Its a feature in the back cover, which allows users to have a better grip on the camera.
The Upper Exterior of The Camera
•Frame Counter: Gives the number of frames (Pictures) taken
•Shutter Button: Activates the shutter, which exposed the light to the film, hence taking that picture.
•Flash Ready Button: Shows when then flash is charged and ready.
•Vent: For ventilation of heat.
The Lower Exterior of The Camera
•Film Casing Cover: It is the cover for the film compartment.
•Film Swindle: It it rolls the Film.
Inner Components
| Part # | Part Name | # | Material | Components Shown in Picture | Manufacturing Process | Image |
|---|---|---|---|---|---|---|
| 1 | Interior Body (front casing) | 1 | ABS Plastic | Moulds for different components, in the front casing | Injection Molding |  |
| 2 | Interior Body (back casing) | 1 | ABS Plastic | View Finder on the back casing. | Injection Molding |  |
| 3 | Outside Cover | 1 | Thin Cardboard | The cover for the camera | Folding |  |
| 4 | Battery | 1 | Alkali Metals | Battery used to power the flash | Machine Made |  |
| 5 | Inner Components (The Component Holder) | -na- | Plastic, solder, capacitors, resistors | Placement of various Components inside the camera | -na- |  |
| 6 | Inner Components (Back View) | ABS Plastic | Placement of various Components as seen from the back view |  | ||
| 7 | Film Canister | 1 | ABS Plastic | The reel holder, where all the film is stored and protected in. | Injection Molding |  |
| 8 | The Lid of the canister holder | 1 | ABS Plastic | This lid is used to seal the compartment in the camera, where the film canister is stored. | Injection Molding |  |
| 9 | Circuit connected to the battery | Shows the way the circuit is connected to the battery |  | |||
| 10 | Front View of the component holder | The placement of different components in the holder. | Injection Molding |  | ||
| 11 | Lens | 1 | ABS Plastic | The Lens of the camera | Injection Molding |  |
| 12 | Bracket | 1 | ABS Plastic | Used to keep the lens attached to the component holder | Injection Molding |  |
| 13 | Component Holder without the lens and bracket | 1 | ABS Plastic | Shows where the lens and bracket were attached | Injection Molding |  |
| 14 | Washer | 1 | ABS Plastic | Used between the lens and the bracket | Injection Molding |  |
| 15 | Camera Shutter | 1 | ABS Plastic | Shows where the shutter is located in the component holder | Injection Molding |  |
| 16 | Screws | 3 | Metal | 3 Screws. 2 of the screws are of similar size, and 1 is bigger. | Injection Molding |  |
| 17 | Flash Button | 1 | Metal | This was used the close the circuit, hence producing the flash | Injection Molding |  |
CAD Drawings
We made a video presentation of the LENS , WASHER and THE BRACKET, unfortunately we couldn't upload the video on this page.
So we used Youtube.com, to host our CAD PRESENTATION, To view the presentation CLICK HERE >>[1]<<.
Assembly
1. Place the lens, bracket and washer in its place. On the Inner Component Holder. No tools are required as the bracket snaps back in place, due to the use of PLASTIC BRACKETS
2. Place the Circuit board on the component holder, and screw the screws back in place.
3. Put the Battery Back in the Battery Holder Compartment in the COMPONENT HOLDER. After placing the battery, make sure to discharge any chagre build up, because it may cause shocks, and is a safety hazard.
4. Loading the Film back on: Place the film in the FILM CANISTER, roll out about 4 of film. Fasten the edge of the film to the FILM SWINDLE.
5. Snap the front and the back covers on.
6. Put the The Lid of the canister holder back on.
7. Wrap the camera up with the cardboard cover, and glue the sides on.
Observations Made
1. Plastic Brackets were extensively used throughout the camera, to keep components intact. Which decreased the production cost, and made is easier to assemble & disassemble.
2. Safety Hazard: The battery charges up the capacitor, which powers the flash bulb. Due to this we had to make sure that we discharge the battery everytime. Or else, anyone touching any metallic part in the circuit would get a shock.
3. A major problem we faced during the assembly was loading the film back into the camera. WE couldnt find a way to stick the edge of the film to the FILM SWINDLE. So we decided to tape it on the swindle. But we figured that these are disposable camera's and no one actually puts the film back on. So it wasnt a Poduct Defect.
Conclusion
This Polaroid 35 mm Disposable camera is extremely well made. It is user friendly, cost efficient, safe to use and portable. Due to these reasons, this product is redily available.
Reverse engineering is the process of discovering the technological principles of a device/object or system through analysis of its structure, function and operation. It often involves taking something (e.g., a mechanical device, an electronic component, a software program) apart and analyzing its workings in detail, usually with the intention to construct a new device or program that does the same thing without actually copying anything from the original.
References
Definition of REVERSE ENGINEERING, From Wikipedia, The Free Encyclopedia. Retrieved 14:06, December 04, 2006, from http://en.wikipedia.org/wiki/Reverse_engineering
