The Canon Electronic Typewriter Ink Ribbon Cassette IR-50 (often labeled as IR-50, IR-50II, or similar variants like IR50II) is a black ink ribbon cartridge designed for use in certain Canon electronic typewriters from the 1980s to early 1990s.It's a thermal transfer or impact/ink film ribbon cassette (not a traditional spool ribbon) that snaps into the typewriter's print mechanism. When you type, the daisy wheel (or similar element) strikes the ribbon against the paper, transferring ink for clear, sharp characters. These ribbons are typically correctable or non-correctable depending on the exact variant, but most IR-50 series are non-correctable black ink for standard typing.Key Details

• Compatibility: Primarily used in Canon's Typestar series and related portable electronic typewriters, including models like:
  • Typestar 2, 3, 4, 5, 6, 7, 80, 90
  • S50, S51, S55, S60, S61, S70, S71
  • Some mentions of B339 or Wordboy PW10 variants
• These were popular for home/office use, offering features like memory, spell-check (on higher models), and portability.
• Yield/Performance: A single cassette typically prints around 30,000–40,000 characters (depending on usage and model), with black ink only (some rare color variants existed in black/red/blue, but IR-50 is standard black).
• Installation: Easy snap-in design—open the typewriter's ribbon cover, remove the old cassette, align and click the new one in place (similar to many electronic typewriters of the era). No spooling or threading required.