Film cassette having film-exposure status indicator
First Claim
1. A film cassette wherein a filmstrip is advanced to the outside of a light-tight cassette shell in order to expose successive imaging areas of said filmstrip and can be returned to the inside of said cassette shell before all of said imaging areas have been exposed or after the filmstrip has been substantially completely exposed, characterized in that:
- a film-exposure status indicator is supported on said cassette shell for movement relative to the shell from a normal first position to successive second and third positions for providing respective visible indications that said filmstrip is generally unexposed, the filmstrip has been returned to the inside of the shell before all of its imaging areas have been exposed, and the filmstrip is substantially completely exposed; and
said cassette shell and said indicator include cooperative engagement means for preventing movement of the indicator to its first position when the indicator is in its second position and for preventing movement of the indicator to the first and second positions when the indicator is in its third position.
1 Assignment
0 Petitions
Accused Products
Abstract
A film cassette is disclosed wherein a filmstrip is advanced to the outside of a light-tight cassette shell in order to expose successive imaging areas of the filmstrip and can be returned to the inside of the cassette shell before all of the imaging areas have been exposed or after the filmstrip has been substantially completely exposed. According to the invention, a film-exposure status indicator is supported on the cassette shell for movement relative to the shell from a normal first position to successive second and third positions for providing respective visible indications that the filmstrip is generally unexposed, the filmstrip has been returned to the inside of the shell before all of its imaging areas have been exposed, and the filmstrip is substantially completely exposed.
38 Citations
16 Claims
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1. A film cassette wherein a filmstrip is advanced to the outside of a light-tight cassette shell in order to expose successive imaging areas of said filmstrip and can be returned to the inside of said cassette shell before all of said imaging areas have been exposed or after the filmstrip has been substantially completely exposed, characterized in that:
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a film-exposure status indicator is supported on said cassette shell for movement relative to the shell from a normal first position to successive second and third positions for providing respective visible indications that said filmstrip is generally unexposed, the filmstrip has been returned to the inside of the shell before all of its imaging areas have been exposed, and the filmstrip is substantially completely exposed; and said cassette shell and said indicator include cooperative engagement means for preventing movement of the indicator to its first position when the indicator is in its second position and for preventing movement of the indicator to the first and second positions when the indicator is in its third position. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A film cassette wherein a filmstrip is advanced to the outside of a light-tight cassette shell in order to expose successive imaging areas of said filmstrip and can be returned to the inside of said cassette shell before all of said imaging areas have been exposed or after the filmstrip has been substantially completely exposed, characterized in that:
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a film-exposure status indicator is supported on said cassette shell for movement relative to the shell from a normal first position to successive second and third positions for providing respective visible indications that said filmstrip is generally unexposed, the filmstrip has been returned to the inside of the shell before all of its imaging areas have been exposed, and the filmstrip to substantially completely exposed; and said cassette shell and said indicator include cooperative engagement means for preventing movement of the indicator to its first position when the indicator is in its second position, though permitting movement of the indicator to its third position, and for preventing movement of the indicator out of the third position when the indicator is in that position.
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9. A film cassette wherein a filmstrip is advanced to the outside of a light-tight cassette shell in order to expose successive imaging areas of said filmstrip and can be returned to the inside of said cassette shell before all of said imaging areas have been exposed or after the filmstrip has been substantially completely exposed, characterized in that:
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a film-exposure status indicator is supported on said cassette shell for movement relative to the shell from only one first position for providing a visible indication that said filmstrip is generally unexposed, to only one second position for providing a visible indication that the filmstrip has been returned to the inside of the shell before all of its imaging areas have been exposed, and to only one third position for providing a visible indication that the filmstrip is substantially completely exposed; and said cassette shell and said indicator include cooperative engagement means for preventing movement of the indicator to its first position when the indicator is in its second position and for preventing movement of the indicator to the first and second positions when the indicator is in its third position.
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10. A film cassette wherein a filmstrip is advanced to the outside of a light-tight cassette shell in order to expose successive imaging areas of said filmstrip and can be returned to the inside of said cassette shell before all of said imaging areas have been exposed or after the filmstrip has been substantially completely exposed, characterized in that:
a film-exposure status indicator is supported on said cassette shell for movement relative to the shell from only one first position for providing a visible indicator that said filmstrip is generally unexposed, to only one second position for providing a visible indication that the filmstrip has been returned to the inside of the shell before all of its imaging areas have been exposed, and to only one third position for providing a visible indication that the filmstrip is substantially completely exposed.
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11. A film cassette wherein a filmstrip is advanced to the outside of a light-tight cassette shell in order to expose successive imaging areas of said filmstrip and can be returned to the inside of said cassette shell before all of said imaging areas have been exposed or after the filmstrip has been substantially completely exposed, characterized in that:
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a film-exposure status indicator is supported on said cassette shell for movement relative to the shell from one position for providing a visible indication that said filmstrip is generally unexposed to another position for providing a visible indication that the filmstrip is exposed; and said cassette shell and said indicator include cooperative engagement means for preventing return of the indicator to the one position when the indicator is in the other position. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification