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Todd-AO Equipment Catalog, Distortion Correction Printer, Mark III
Engineered by American Optical Company, Southbridge, USA

Read more at
in70mm.com
The 70mm Newsletter
Captions by: Brian O'Brien, Jr. around 1997. Images by: American Optical Company, around 1955. Date: 21.05.2014
Front view of Todd-AO's Distortion Correcting Printer, Mark III installed in Fort Lee, New Jersey

The
Distortion Correcting Printing Process was initially meant to be an integrated part of the Todd-AO system. It was originally designed to eliminate three types of distortion, keystone distortion, distortion resulting from using a deeply- curved screen, plus correcting the distortion arising from use of the extremely wide-angle lenses, in both photography and projection. Grant Lobban

Description of Todd-AO Mark III Printer Principle

"Oklahoma!" Printing Operation in the Todd-AO Mark III Printer 


Todd-AO - Distortion Correcting Printing Process
 
More in 70mm reading:

Back to Todd-AO Catalog

Todd-AO Birth date
How Todd-AO Began
Todd-AO Home

DP70 / Universal 70-35 / Norelco AAII - The Todd-AO Projector

Description of Todd-AO Mark III Printer Principle

"Oklahoma!" Printing Operation in the Todd-AO Mark III Printer 

Todd-AO - Distortion Correcting Printing Process

Internet link:

 
Rear view showing control cables.

 
 
Side view showing the supply reels at the top and the take-up reels at the bottom. The closed reels are for the raw stock and the open reels are for the negative. The circular pulley in the center is the heavy flywheel on the printing drive to insure smooth motion.
 
 
Long shot of printer and control boxes.

 
 
Long shot of printer with control boxes.

 
 
System control panel.

 
 
Front of control cabinet

 
 
Inside control cabinet.

 
 

Film Path & Raw stock supply spool

 
Diagram of the film path.

 
 
Benny Grinsewitz loading raw stock.

 
 
Raw stock supply spool with door open.
 
 
Close-up of the take-up section with raw stock can on right and with negative threading back to the open reel farther back.
 
 
Negative and raw stock reels.

Supply section.

 
 
Negative and raw stock take-up section.

 
 
Negative coming from the supply to the print section.

 
 
Printing section showing on left the negative slit illuminated in straight line & on the right the print stock on the curved shoe & slit illuminated with a curved line (The B, or “Droop” correction).

 
 
Another front view of printing section.

Printing section showing on left the negative slit illuminated in straight line & on the right the print stock on the curved shoe & slit illuminated with a curved line (The B, or “Droop” correction).
 
 
Front view of printer showing the correcting cam shift mechanism.

 
 
Close-up of cam shift mechanism and magnetic fluid break.

 
 
Front of print section with only raw stock loaded.

 
 
Front of take-up section.

 
 
Frame line shutter top make the competition think it was a step printer.

 
 
Print section from above with hand on the curved print shoe.
 
 
Close-up of print section.
 
 

Color correcting (“timing”) filters

 
Color correcting (“timing”) filters for each scene were carried in pockets on 65mm clear stock. Roll of these is contained in the cylindrical can on left. The active one is in the circular light beam at the center. These filters get indexed along at each scene change.

 
 
Timing filters in their pocket carrier.

 
 
65mm and 35mm film reels.

 
 

Paper Tape Reader

 
The printers were controlled by punched paper tape, executing correction cam changes and filter changes at each scene change.

Front view showing the paper tape reader in lower right.

 
 
Front of take-up section showing the paper tape control reader on the right.

 
 
Paper tape drive with its control.

 
 
Paper tape drive on the printer.

 
 
Paper tape drive controlling scene changes.
 
 
A control unit.

 
 
Paper tape reel & case.

 
 
Control paper tape transport case.

 
 
Control paper tape.

 
 

Printing illumination section

 
Printing light source system.

 
 
Printing illumination section.

Rear view of frame line shutter

 
 
Light source control box.

 
 

Optical Bridge

 
Side view of print section with optical bridge at high droop angle.

 
 
Side view of print section with optical bridge at medium droop angle.

 
 
Side view of print section with optical bridge at zero droop angle.

 
 
Benny Grinsewitz focusing the optical system.

 
 
Bridge with microscope for focusing printer.

 
 
   
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Updated 22-12-16