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Introduction To Engineering Camera Lab #2 - 2

Introduction To Engineering Camera Lab #2 - 2. Agenda Open cameras, remove batteries, discharge capacitors, and disassemble/reassemble ! Sketch critical elements of the shutter mechanism Estimate Shutter speed from photos of bike wheels. Important notes:. Each group must record data

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Introduction To Engineering Camera Lab #2 - 2

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  1. Introduction To EngineeringCamera Lab #2 - 2 Agenda Open cameras, remove batteries, discharge capacitors, and disassemble/reassemble ! Sketch critical elements of the shutter mechanism Estimate Shutter speed from photos of bike wheels

  2. Important notes: • Each group must record data • Make sure one person in each group gets all the data! • Make sure data is given to all group members

  3. Measuring Blur Angle Measure the blur angle (q ) with a protractor

  4. Estimating Shutter Speed • Measure the blur angle (q) with a protractor • The radius of the wheel is r • The bicycle traveled at 15 mph. Convert this to in/sec.

  5. Estimating Shutter Speed • The amount of travel per revolution is The angular speed is given by If qis the blur angle in degrees, the fraction (f) of a revolution is

  6. Estimating Shutter Speed • The time (t ) for the wheel to move the fraction (f ) of a revolution for a constant angular speed is related to f by: The time (t ) is expressed in the formula:

  7. 12 (13) t = = 0.010 sec = 10 milli sec sec , 15 100 Estimating Shutter Speed • The speedometer actually measures the angular velocity of the wheel axis. It assumes a wheel diameter of 26” to convert to ground speed. Therefore, use r = 13 in and assume θ = 12 deg;

  8. Making the Camera Safe • Pry open the five snap fits that hold the back cover: both ends, top, bottom, back. • Remove the back case, and take out the battery. Note battery orientation (+ down)! • If the front cover falls off, put it back on without touching any part of the circuit board

  9. Making the Camera Safe • Wind the shutter release by rotating the blue wheel until it stops. • Press shutter release to trigger the flash. • Take off the front case, and hand the camera to the instructor. Don’t touch anything on the circuit board, especially the small black can! • The instructor will touch a screwdriver across capacitor leads to discharge the capacitor. • The camera is now safe to handle.

  10. Front of Camera Snap to release lens assembly Capacitor Capacitor leads

  11. Older Type of Lens Assembly

  12. Shutter Cocked for Picture Pivot allows shutter to rotate open when arm moves to right.

  13. Shutter Open Spring tab connected to circuit board Contact between shutter and bar completes flash trigger circuit Brass bar connected to circuit board

  14. Shutter in closed position

  15. Summary of Lab Steps • Remove back of camera, remove battery, wind and release shutter/flash; have instructor discharge capacitor. • Measure blur angle, compute shutter speed, and record value. • Disassemble and reassemble camera with emphasis on shutter mechanism. • Sketch critical elements of shutter mechanism.

  16. Assignment • Read Camera Lab 2 materials CAREFULLY!!

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