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Method for determining whether film is developed or undeveloped

  • US 5,923,914 A
  • Filed: 10/23/1996
  • Issued: 07/13/1999
  • Est. Priority Date: 10/25/1995
  • Status: Expired due to Fees
First Claim
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1. A method of determining the type of film in a film cartridge, said method comprising:

  • detecting whether or not a case wall of said cartridge has a nail as a first judgement of whether said film is an undeveloped film or a developed film;

    operating a film feeder for the purpose of feeding said film slightly out of a film feed outlet leading from said cartridge;

    if said first judgement is that said film is a developed film, emitting visible light toward a film feed passage along which said film is fed from said outlet and thereby determining the presence or absence of said film at said film outlet, while also emitting infrared light toward said film passage and thereby making a second judgement of whether said film is an undeveloped film or a developed film; and

    if said first judgement is that said film is an undeveloped film, not emitting said visible light, and emitting said infrared light toward said film passage and thereby determining the presence or absence of said film at said film outlet and also making said second judgement of whether said film is an undeveloped film or a developed film.

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