It Reflects Light (by Shining A High-intensity 1000-watt Bulb) From The Surface Of An Opaque (or Flat) Object. An Opaque Projector Uses A System Of Mirrors, Prisms Andor Imaging Lenses To Focus An Image Of A Material Into A Projection Screen. The Reflected Light Needs To Be Projected For An Image To Be Seen And This Requires Brighter Bulbs And Larger Lenses Than Overhead Projectors. Thus, It Should Be Taken Care That The Heat Generated By The Light Source Does Not Damage The Materials. The Opaque Projector Is Intended For Different Purposes Such As Teaching And Briefing; It Also Aids Draftsmen By Enlarging Images That They Want To Redraw. An Opaque Projector Can Also Project Any Relatively Flat Object Like Coins, Tiny Gears, Cams, And Small Machine Parts.Parts Of An Opaque Projector Are An Onoff Switch, An Optical Pointer, A Focusing Knob, A Roll Feed Assembly, A Platen Assembly, And A Fuse Holder. The Rest Of The Parts And Functions Are Self-explanatory Except For The Roll-feed Assembly That Acts Like A Pass-on Belt That Slides Objects Into The Projection Platform. The Roll Feed Is Situated On The Platen Assembly And Allows For The Left-to-right Movement When A Hand Crank Is Turned On The Side Of The Machine. The Platen Assembly Is Responsible For Raising And Lowering The Projection Platform. This Process Allows For Objects To Go Up To 1 Inches Thick. The Lock On The Platen Assembly Is Spring-loaded So That Care Must Be Taken To Prevent The Projection Platform From Snapping Up.In The Early And Mid 20th Century, Manufacturers Produced Low Cost Toy Projectors For Children In The Likeness Of The Opaque Projector. The Opaque Projector Was Also Sold As An Artists Enlargement Tool And Used In Lectures And Discourses To Reflect Images To A Prepared Canvass. While The Rest Of The Manufacturers Of Projectors Nowadays Are Onto The Race For Smaller Sizes, This Is One Of The Limitations Of The Opaque Projector. It Has Cumbersome Size And Weight, And It Does Not Illuminate The Screen Brightly, Which Necessitates Brightening A Room With Additional Lights. However, Youd Be Surprised At The Price Of Opaque Projectors Today. Some Prices Go As Low As 49.95 For An Autograph Tracer Jr. Opaque Projector.
