Ricoh Synchrofax

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The Ricoh Synchrofax is a Japanese voice recorder from 1959, which was reissued as the 3M Sound Page (Model 627AA and 627AG ) in 1974 as official teaching material in the US state of Oklahoma . It is also known as Sound Paper . The inventor is Sakae Fujimoto, who filed patents US3074724A and US3046357A in 1959.

technology

The device produced by Ricoh uses magnetically coated paper on the back, which is positioned on the device with three perforations. A sound head is spirally moved from the outside to the inside on a rotating disc. Up to four minutes can be recorded per side. Microphone, headphones and recording control ("monitor") are connected via 3.5 jack plugs .

The device weighs 5.7 kg, has 11 bipolar transistors and dimensions of 270 × 140 × 375 mm (= 10.6 × 5.5 × 14.8  " ).

In 1973, the 3M device for schools was $ 299 , which would be $ 1,717 today.

Web links

Individual evidence

  1. ↑ a b For teachers - pictures that talk , Popular Science, May 1973 issue, p. 94
  2. ↑ Sakae Fujimoto, Nihon Denki Bunka Kogyo Kabush, Riken Kogaku Kogyo Kabushiki K: Patent US3074724 - Apparatus for positioning recording and recorded sheets on a magnetic recorder and reproducer . In: Google Books . September 14, 1960 ( google.com [accessed April 22, 2018]).
  3. ↑ Sakae Fujimoto, Nihon Denki Bunka Kogyo Kabush, Riken Kogaku Kogyo Kabushiki K: Patent US3046357 - Magnetic recording and reproducing machine . In: Google Books . September 7, 1960 ( google.com [accessed April 22, 2018]).
  4. ↑ Techmoan: RetroTech: Recordable Paper - The 3M Sound Page , YouTube from April 12, 2018
  5. ↑ Synchrofax RP in the Radio Museum , accessed on April 22, 2018