Method of and apparatus for distinguishing between exposed and unexposed film units

• US 4,526,453 A
• Filed: 05/02/1983
• Issued: 07/02/1985
• Est. Priority Date: 05/02/1983
• Status: Expired due to Term

• Current Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Original Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Inventors: Johnson, Bruce K., Schettino, Anthony J.
• Primary Examiner(s): Perkey, William B.
• Application Number:
  US06/490,316
• Time in Patent Office: 792 Days
• Field of Search: 354/181, 354/86
• US Class Current: 396/367
• CPC Class Codes: G03B 17/34 Changing plates or cut films
• CPC Class Codes: G03B 19/10 Plate or cut-film cameras with provision for alternative use with roll film G03B19/08

Abstract

A photographic system is disclosed having a cassette containing unexposed film units therein. A film handling apparatus cooperates with the units for selectively withdrawing the units from the cassette for exposure and then returning them for storage. Also, there is means for use in facilitating the differentiation between exposed and unexposed film units. Such differentiation is facilitated by altering the position of the exposed units relative to the unexposed units.

Claims

1. A film cassette for use with a camera, said film cassette comprising:

an open faced casing;

a plurality of film units, each having a light sensitive area, stacked in said casing with a given edge portion of each presented at said open face for facilitating sequential removal of each within a camera for exposure; and

,

a light attenuating member located between adjacent film units and extending across the light sensitive area thereof so as to attenuate transmission of light to said light sensitive area of any of the undeveloped film units responsive to removal of a film unit whereby said cassette may be exposed to light following removal of one or more film units, but prior to exposure and development of all units, without admitting light to the light sensitive areas of the remaining film units wherein said light attenuating member is fixed within said casing so as to define therewith a separate compartment for each film unit having a compartment opening formed at the open face of said casing, and said given edge of said film unit is configured for cooperating with said compartment opening to light seal each said compartment prior to removal of its film unit.

2. The cassette of claim 1 wherein each said film unit includes expandable light attenuating material extending along its said given edge so as to be compressed into light sealing engagement with its compartment opening when the exposed film unit is originally positioned therein and to resist complete reinsertion of the film unit following its exposure and development whereby said cassette provides a lighttight environment for unexposed film units and storage for exposed units.

3. A camera system comprising:

a film cartridge having an open face;

a plurality of discrete photographic film units stacked within said film cartridge with a given edge portion thereof located at said open face;

means for receiving said film cassette;

a focal plane configured for receiving a film unit thereat;

means for directing image forming light rays from a photographic scene to said focal plane and for controlling the passage of scene light thereto so as to produce an exposure of the film unit located thereat; and

,

means responsive to initiation of an exposure cycle for cooperating with an unexposed film unit to advance it from its original location in said film cartridge to said exposure plane, and following an exposure thereof, for subsequently returning said film unit to a locational arrangement in said cartridge at least distinguishably different from its original location so that exposed film units are clearly distinguishable from unexposed film units.

4. The invention of claim 3 wherein each exposed film unit upon return is laterally displaced with respect to its original location.

5. The invention of claim 4 wherein said means for changing the position of the unit resists full return of each said film unit in said cartridge so as to facilitate maintaining each of said film units in a distinguishably displaced location.

6. The invention of claim 5 wherein said means for resisting full return comprises expandable material located on each film unit for being in a compressed state when the film unit is in its original position and for expanding upon advancement of the film unit to said exposure plane for exposure so as to thereby resist full return of the film unit to its original location in said cartridge.

7. The invention of claim 6 wherein said expandable material is opaque and serves to provide a lighttight arrangement with cartridge.

8. The invention of claim 3 wherein said means for changing the position includes a pick assembly driven through equal forward and reverse strokes and including a pick member for engaging an indentation in an edge of the film unit, said pick member having a given length as measured in the stroke direction and including leading and trailing surfaces for respectively engaging the film unit upon forward and return advancement thereof, and each of said film units including an elongated pick engaging indentation of a length exceeding the length of said pick member such that each film unit, following advancement for exposure, is returned to a position just short of its original location in accordance with the excess length of said indentation.

10. The invention of claim 8 wherein said means for cooperating includes expandable and contractable material located on the leading edge of each film unit and being in a compressed state when the film unit is in its original position but expandable upon advancement of the film unit for exposure so as to thereby resist full return of the film unit during its return to the cartridge.

9. A film cassette for use with a camera having a film handling mechanism driven through forward and reverse strokes for advancing a film unit to a focal plane of the camera for exposure during a forward stroke of the film handling mechanism, said film cassette comprising:

a film cartridge; and

,

a plurality of discrete film units located within said cartridge, each of said film units including means for cooperating with said film handling mechanism for allowing advancing said film from its original location in said cartridge during the forward stroke and for returning said film unit during the reverse stroke of said film handling mechanism, and said cooperating means including means for returning each film unit to a new position in said cartridge just short of its original location so that unexposed film units are distinguishable from unexposed film units in said cartridge.

11. A system for use in facilitating the differentiating of exposed and unexposed units in an image recording apparatus comprising:

an image recording unit;

means for defining a housing having at least one compartment being sized and configured to store therein at least one of said units;

said unit capable of being at least partially removable from an original stored position in said compartment by a film unit handling mechanism for allowing exposure of said unit and being returnable into said compartment by the film handling mechanism to a new stored position different from the original stored position; and

,

means operable with the film handling mechanism for altering the position of said unit relative to the original position when the exposed unit is returned to said compartment by the mechanism so as to facilitate differentiating between exposed and unexposed units because of the altered position.

12. The system of claim 11 wherein said housing means includes a plurality of said compartments in juxtaposed relationship and said system further includes means for mounting said housing means for advancement, and means for incrementally advancing said housing means so that each storage compartment is sequentially positioned at an exposure position;

and film handling means selectively operable for at least partially removing each of said units from the original storage position to the exposure position and for returning the exposed film unit into said compartment, said expandable material prevents further return of said unit into said compartment to thereby indicate that said unit has been exposed.

13. A method of distinguishing between exposed and unexposed image recording units which are storable in a housing having a plurality of compartments being sized and configured to store at least one of the units therein, wherein the units are stored in an original stored position, the method comprising the steps of:

at least partially removing a film unit from its original position in the compartment for allowing exposure thereof; and

,

returning the film unit to a new stored position in the same compartment different from the original stored position to thereby indicate the fact that the film unit has been exposed.

14. The method of claim 13 wherein said returning step includes the step of altering the dimension of at least one of the units and its associated housing compartment upon at least partial removal of said unit from the original position for exposure purposes so as to thereby resist return of the unit to the original stored position so that the difference between an exposed and unexposed film unit is determinable by the position of the exposed unit with respect to the unexposed unit.

15. A photographic system comprising:

means for receiving and mounting a film cassette for movement along a given path;

a film cassette including a plurality of adjacent photographic film compartments each having an opening for permitting removal of a photographic film unit therefrom, each said compartment retaining a film unit therein;

means for directing image forming light rays from a photographic scene to a focal plane and for controlling the passage of scene light thereto so as to produce an exposure of a film unit located thereat; and

,

film handling means responsive to initiation of an exposure cycle for cooperating with an unexposed film unit to advance said unit from its compartment to said focal plane, and following an exposure thereof, for subsequently returning the film unit to its said original compartment.

16. The system of claim 15 further including means responsive to the return of an exposed one of said units to its respective compartment by said film handling means for altering the position of said exposed unit relative to its original position whereby an exposed film is distinguishable from exposed film units.

17. The system of claim 16 wherein said position altering means includes means on each said unit which restricts return of said unit to its original position in its original compartment.

18. The system of claim 15 wherein said system further includes means for incrementally advancing said cassette along said path following return of an exposed film to its original compartment so as to present an adjacent unexposed film unit at a position which is cooperable with said film handling means whereby the unexposed film unit can be moved to said focal plane for exposure.

19. A film cassette for use with photographic apparatus, said apparatus comprising:

a casing having an open face;

a plurality of film units disposed adjacent each other, each one of which has a light sensitive area and means for facilitating their insertion and removal into and from said casing through said open face,

means for attenuating light from each of said light sensitive areas whenever said units are in said casing and for attenuating light from said light sensitive areas of units remaining in said casing if one or more units is removed from said casing, whereby said casing can be removed from the photographic apparatus without light affecting said light sensitive areas and film units can be removed from said casing when within the photographic apparatus without light affecting other ones of said film unit;

said attenuating means including means on separate ones of said units which cooperate with said casing to protect the light sensitive area of each unit from ambient light coming through said open face.