PHOTOGRAPHIC METHOD AND APPARATUS EMPLOYING AUTOMATIC CAMERA

Abstract: A photographic method and apparatus in which a camera (10) adapted to receive a film container (14) with at least one light-sensitive film unit and a dark slide (34) protecting the film unit from light prior to insertion of the container into the camera, wherein the dark slide and/or film unit carry machine-readable information corresponding to the value of at least one film variable applicable to the film unit. The camera is equipped with reading means (66) by which the indicia is read while the slide and/or film unit is stationary or during discharge from the camera to provide appropriate camera adjustment under control of signals developed by the reading step. The indicia may be in the form of a magnetic recording medium, in which case, the reading means carried by the camera is a magnetic read head (66) or, alternatively, the indicia may be optically readable by optical scanning means carried by the camera. The indicia may contain both exposure and post-exposure information, and where the reading of the indicia occurs during slide or film advancement, the exposure information is applied to camera operation for the next film unit.

Description: This invention relates to photographic methods and apparatus and more particularly, it concerns a method and apparatus for automatically adjusting one or more functions of a photographic camera in accordance with indicia supplied with a container for film units adapted to be exposed in the camera. It is well known in the photographic art to supply light-sensitive film in cartridges or cassettes capable of direct insertion into a camera and to provide the cartridge or cassette with some form of indicia corresponding to one or more characteristics of the film for cooperation with camera carried indicia responsive means to adjust various camera control functions automatically. US-A-3,593,631 US-A-3,672,752 US-A-3,848,985 may be considered exemplary of a large number of prior art disclosures in this area. In US-A-3 593 631 for example, a cassette for a plurality of film units adapted for exposure and processing in an instant camera provided with a thermistor capable of effecting automatically exposure compensation for both film speed as well as temperature variation. US-A-3 672 752 features a coded film cassette in which the indicia is in the nature of a conductive strip or strips carried on the film cassette exterior to adapt both a camera and a projector for density variation of film carried in the cassette. US-A-3 848 985 is typical of many systems in which the indicia is in the nature of an exterior surface formation on a film-carrying cassette and operative to regulate an automatic exposure control system when the cassette is inserted into the camera. The general idea of providing a film-carrying cassette with some form of camera discernible indicia corresponding to one or more characteristics of the film contained in the cartridge or cassette has and continues to be used effectively for automatic control of camera exposure-parameter adjustment or other adjustments incident to the attainment of a high-quality photograph originating with the cassette-contained film unit or units. The increment of manufacturing expense attributed to the film unit container or cassette per se , however, coupled with the increment of manufacturing costs attributable to modifying the structure of such containers and correlating the insertion of film units into such cassettes leaves room for improvement from the standpoint of cost reduction. In addition, with the development of new films, increased ranges of variables are presented, thus requiring more versatile systems for representation of the cassette-contained film units than can be easily accommodated by variable physical characteristics of the cassette. Also, multiple variables in film, such as film speed, diverse sensitometry, color balance, and the like present a challenge to automatic adjustment of camera functions to accommodate each of such variables. US-A-4 270 853 relates to sound-recording instant printing films and a photographic selfdevelopment camera to be used for the films. The camera has a sweeping magnetic recording/reproducing head that sweeps touching and along the magnetic sound recording band, thereby enables recording of ambient sound of photographic scenery, or reproducing of the recorded sound while seeing the instant-printed photography. (The preamble of claim 4 is based on last mentioned US-PS.) US-A-4 349 272 relates to a circuit arrangement for controlling the exposure time of reproduction cameras in dependence on the sensitivity of the photographic material that is used. For this purpose exposure time of the reproduction camera is automatically controlled by markings provided on the packaging for the photographic material and which represent the sensitivity of the material and its emulsion number respectively. These markings are read by a read head and stored in a memory. A decoder is able to translate the stored information into a signal which is passed to a multiplier and used to modify a basic time signal supplied from a coding switch to the multiplier. The resulting signal is passed to a comparator. On receipt of a signal at the comparator an exposure control device, which has been previously energized via start button energizes the exposure lamps and the exposure commences. A counter starts a count at the beginning of the exposure period and this count is compared in the comparator with the signal received from the multiplier and, as soon as equality is reached, the exposure control device is automatically switched off. The multiplier is also able to modify the exposure time via signals representative of the selected aperture and reproduction sizes. In US-A-4 338 008 a photographic device is disclosed comprising a chamber enclosing a plurality of film units having a light-sensitive surface and a known value of a particular film characteristic. The chamber is provided in a film pack container. A sensing mechanism is provided for adjusting automatic photographic functions of the apparatus in accordance with particular film characteristics of the film unit to be used. Included in the sensing mechanism is a plurality of sensing arrangements operable between different sensing states, which number of states is in excess of the number of sensing arrangements, responsive to different coding arrangements, on respectively different containers for effecting a select photographic function according to the film characteristics represented by the coding arrangement. A principal object of the present invention is, to provide an inexpensive and highly versatile system and method for correlating an adjustable camera operating parameter with a known value of one or more film variables applicable to one or more film units carried in a particular film container. This object is achieved by the combined features of claim 1 (as far as the method is concerned), the characterizing features of claim 4 (as far as a film pack is concerned), the combined features of claim 15 (as far as the photographic device is concerned) and the combined features of claim 23 (as far as a photographic system is concerned). In accordance with the present invention therefore photographic systems are provided in which a container housing at least two discrete, superimposed, opaque sheet units, is insertable as a film pack into a camera or camera back with the uppermost sheet unit functioning to block the entrance of light through at least an exposure opening in the container, such that the top one of the at least two sheet units functionally defines a dark slide while the other of the at least two sheet units defines a film unit. The film pack is adapted for correlation of camera operation with at least one film variable, such as film speed, color balance, sensitometry, or the like by providing indicia on at least one of the sheet units corresponding to a known value of the film variable for the film units packaged in the container, reading the indicia, and adjusting an appropriate operating parameter or function of the camera to account for the read value of the film variable. In accordance with one embodiment of the present invention where the film pack includes a dark slide and at least one film unit and the camera is capable of retaining operation or function information during the sequential exposure of all of the film units within the film pack, the dark slide is provided with indicia corresponding to a known value of film variable for the at least one film unit packaged with the dark slide in the container. The indicia is read while the dark slide is removed from the container and camera prior to exposure of the at least one film unit. The camera adjusts an appropriate exposure or post exposure parameter or function to account for the read value of the film units packaged with the dark slide and sequentially exposed. The indicia may be carried by the dark slide as a coating of a magnetic recording medium on which the information relative to one or more film variables may be recorded magnetically. In this case, the camera is provided with at least one magnetic head for reading the indicia. Alternatively, the indicia may be printed on the dark slide to be read by an optical scanning device in the camera. Regardless of the form of dark slide indicia and corresponding camera carried reading means, the variable operating parameters or functions of the camera will be adjusted in accordance with information carried by the dark slide for all film units packaged with the dark slide in a particular film container. In accordance with another embodiment of the present invention where the uppermost film unit may be sacrificed as a dark slide if a partially exposed film pack is removed and later reinserted in the camera, indicia may be carried on each individual film unit as well as on the dark slide. In such an embodiment, the indicia may be carried by either peel-apart or integral type film units. When the information is read during dark slide or film movement, exposure information can only be provided for the next successive film unit while post-exposure information can be directed to the film unit carrying the indicia and/or the next film unit. In accordance with yet a further embodiment of the present invention a film container is constructed so that a stationary reading head on the camera can read indicia on a film unit prior to exposure of the film unit. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view of a film container incorporating the present invention; Fig. 2 is a largely schematic longitudinal cross-section of a camera adapted to receive the film container shown in Fig. 1; Fig. 3 is a schematic perspective view illustrating an exemplary camera carried adjustable component and system for its adjustment in accordance with indicia carried by a film container dark slide; Fig. 4 is a fragmentary perspective view illustrating an alternative format of dark slide carried indicia; Fig. 5 is a schematic view illustrating a system for reading the indicia illustrated in Fig. 4; Figs. 6 and 7 are schematic views illustrating a peel-apart film unit in accordance with alternative embodiments of the present invention. Fig. 8 is a schematic view illustrating a film pack container used with peel-apart film in accordance with the present invention; Figs. 9 and 10 are views of the pull tabs of peel-apart film in accordance with alternative embodiments of the present invention; Fig. 11 is a partial cross-section of an alternative embodiment of a camera including a film container with a peel-apart film unit such as shown in Fig. 6; and Fig. 12 is a partial cross-section of an alternative embodiment of a camera including a film container with a peel-apart film unit having tab arrangements as shown in Figs. 9 and 10. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In Figs. 1-3 of the drawings, an exemplary embodiment of the invention is shown in an instant photography system including a camera 10 and a film pack 12 adapted to be received in the camera. Because the general structural organization of the camera 10 and cassette 12 is conventional and well known in the art, much of the camera structure has been omitted from Figs. 2 and 3 in the interest of more clearly illustrating the novel features of the present invention. For example, the film pack 12 is insertable through a reclosable door assembly (not shown) into a camera defined chamber which, though also not shown, may be assumed as defined by interior camera structure capable of receiving and retaining the film pack 12 in the relative position shown in Figs. 2 and 3. The film pack 12 includes a box-like container or cassette 14 having top, bottom, front, back and side walls 16, 18, 20, 22 and 24, respectively. The top wall 16 is open over a substantial portion of its area to define an exposure window 26 joining with a rearwardly disposed pick slot 28. The front wall 20 is provided with a film unit discharge slot 30 near its upper edge and extending across the width of the front wall 20 between the side walls 24. The container 14 is adapted to receive a plurality of film units 32 (Fig. 2) which are loaded by follower spring (not shown) in a manner to be biased upwardly against the underside of the top wall 16. Each of the film units also conventionally include an upwardly facing light-sensitive surface to be presented at the exposure window 26. To provide a light-tight enclosure for the film units 32 in conjunction with the container 14, the film units 32 are initially packaged with a dark slide 34 sandwiched between the uppermost one of the originally packaged film units 32 and the underside of the top wall 16. The dark slide 34 is opaque, typically formed from a cardboard-like material, and is of a generally rectangular configuration to be coextensive with the film units 32. An opaque leaf-like tab 36 projects from the front edge of the dark slide through the slot 20 to prevent entrance of light to the container interior with the dark slide in place. The principal function of the dark slide, of course, is to act as a closure for the exposure window 26 during the time between packaging the film units 32 in the container 14 and insertion of the film pack 12 into the camera 10. As thus described, the film pack 12 is conventional and readily available commercially under the trade designation "Polaroid SX-70 Land Film." Also in this context, the conventional or known procedure for exposing and processing the film units 32 in the camera 10 may be appreciated by reference to Fig. 2 of the drawings. Specifically, with the film pack 12 in position as shown in Fig. 2, the exposure window 26 is presented on the objective axis 38 which is folded as a result of its definition by an objective lens 40 and a mirror 42. The camera 10 is conventionally equipped with a lens aperture stop 44 typically defined by a shutter 46. Upon actuation of the shutter 46, a pick 48 reciprocates in the pick slot 28 of the film pack 12 to advance the uppermost sheet presented at the exposure window 26 forwardly to the nip of a pair of processing rollers 50. The rollers 50 then advance the uppermost sheet forwardly out of the camera. When initially loaded into the camera 10, the uppermost sheet presented at the exposure window 26 in the film pack 12 will be the dark slide 34. The dark slide is advanced from the container along its longitudinal length through the slot 30 by movement of the pick 48 and rotation of the rollers 50 so as to be ejected from the camera to present the first film unit 32 at the exposure window 26 for exposure by subsequent actuation of the shutter 46 followed by movement of the pick and the rollers. As is well known in the art, the camera may be equipped with a motor drive for effecting operation of the pick and rollers automatically or the dark slide 34 and film units 32 may be provided with tabs adapted to project forwardly through the front wall 20 of the container 14 for manual withdrawal of the dark slide and film units from the camera 10. All film units 32 in a given film pack 12 will have the same known value of one or more film variables such as film speed, film color balance, film sensitometry, and the like. To accommodate film units having different values of the respective film variables in the context of assuring proper exposure and/or processing, the camera 10 must be adjustable to expose and/or process each film unit 32 in correspondence to the known values of film variables applicable to the film pack 12 loaded in the camera. For example, variation in film speed must be accounted for by appropriate adjustments of camera shutter speed or aperture stop; variation in film color balance may be accounted for by use of different filters on the objective axis 38; and variation in film sensitometry, at least for self-developing film units of the type represented by the units 32, may be compensated for by adjustment of the nip spacing between the processing rollers 50. Such camera operating adjustments to account for film variables are known in the art. It is equally well known that camera adjustment to accommodate any one of such film variables may be effected automatically by use of some form of electrical or mechanical coding carried by the container of film represented in the illustrated embodiment by the container 14. In accordance with the present invention, information as to the known value of one or more film variables of film units 32 in a given film pack 12 is carried by and essentially in the plane of the dark slide 34 so that as the dark slide 34 is removed from the film pack after the latter has been inserted into the camera, the information carried by the dark slide may be read and used to control one or more camera adjustments incident to proper exposure and/or processing of each film unit in a given film pack 12. To illustrate an exemplary embodiment of apparatus for practicing the invention, the camera 10 in the illustrated embodiment is shown to include an adjustable filter carrier 52 movable about an axis 54 (Fig. 3) to position any one of three filters 56, 58, and 60 on the objective axis 38 between the lens 40 and the aperture stop 44 in the disclosed embodiment. Movement of the filter carrier 52 on the axis may be effected by a suitable controller such as a stepping motor 62. In the embodiment of Figs. 1-3 of the drawings, the dark slide 34 carries an elongated strip of a magnetic recording medium 64 coated or otherwise affixed to the upper surface of the dark slide 34, generally aligned in the direction of slide advancement, and in a position such that as the dark slide is ejected from the camera, as represented in Figs. 2 and 3, the strip of magnetic recording medium 64 passes under a magnetic read head 66. The information sensed by the read head 66, which may take the form of digital or analog signals, is fed to information processing and control circuitry 68 to effect control of the camera adjusting means, in this instance, the stepping motor 62. Where the information recorded on the strip 64 of magnetic recording medium carried by the dark slide 34 is in digital form, the control circuitry 68 may take the form depicted in Fig. 2 of the drawings. Specifically, the digital signals originating in the read head 66 are amplified and conditioned by an amplifier and pulse conditioning circuit 70 with the amplified signals fed to a counter 72. The pulses are counted by the counter 72 with the cumulative count presented to the controller or stepping motor 62. When a total of pulses corresponding to the known value of the film variable represented by the dark slide record strip 64 is reached, the filter carrier 52 will be properly positioned. A counter reset 74 may be actuated by suitable means such as a switch 78 actuated upon withdrawal of the container 14 from the camera 10. In Figs. 4 and 5, and alternative embodiment is shown in which the dark slide 34' is provided with an elongated strip 64' (e.g., a bar code) of spaced reflective areas 76, aligned in the direction of slide movement, the number of which will correspond to the known value of a film variable of the units 32 carried in a given film pack 12. As shown in Fig. 5, as the dark slide 34' is discharged from the film pack 12 and the camera 10, the strip 64' will pass under a reading device in the form of a light-emitting photodiode 78 and a light-responsive photosensor 80 such as the illustrated photodiode or other sensors including photocells and phototransistors. The light pulses read by the transistor 80 are fed to an amplifier 82, to a counter 84 so that a controller 86 may be stepped to the proper position for adjustment of the appropriate camera function 88. The light-emitting diode 78 is in circuit with a switch 90 by which the light-emitting diode is turned on when the film pack 12 is inserted into the camera. When the dark slide 34' is discharged from the film pack 12 and the photosensor 80 generates its first pulse, a timer 92 is actuated to turn off the switch 90 after a predetermined time delay thereby to turn off the light-emitting diode 78 after the strip 64' has passed the optical reading station represented by the diode 78 and photosensor 80. The diode 78 and sensor 80 can be operated in the infrared region for arrangements where visible light could contaminate yet unprocessed film. In light of the embodiments illustrated in Figs. 1-5, it will be appreciated that the provision of information on the dark slide of a film pack 12 corresponding to values of film variables entails little more manufacturing cost than printing the dark slide 34 or 34'. Perhaps more importantly, the system of Figs. 1-5 is easily enlarged to accommodate a plurality of film variables by providing a plurality of information tracks 64 on each dark slide and separate reading means and control circuitry carried by the camera for effecting several camera control functions. On the other hand, in situations where the film pack is removed before exposure of all of the film units to be later reinserted or when another partially used film pack containing different type film units is to be inserted in the camera, the partially used film pack does not have an indicia carrying dark slide to provide the camera with indicia for the proper adjustment information. A contemplated solution to this problem is the provision of indicia on each film unit in the film pack which has the additional advantage of reducing the memory requirements of the camera or camera back since the indicia information is read off of each film unit. In Figs. 6-12 of the drawings, other embodiments in accordance with the present invention are shown in an instant photography system wherein the machine readable indicia described previously for the dark slide is similarly applied to each film unit. Since the application to each film unit is wider for peel-apart film rather than integral film, the former is illustrated in these figures. Because the general structural organization of peel-apart film using cameras is conventional and well-known in the art, much of the camera structure has been omitted from Figs. 11,12 in the interest of more clearly illustrating the novel features of the present invention. With respect to Fig. 6, a peel-apart film unit 100 includes a negative 110, positive 112 and leaders 114 and 116 interconnecting the negative 110 and positive 112. The negative 110 has an image-receiving coating 118 on one surface and the positive 112 has an image-producing coating 120. A pull tab 122 is releasably attached to the underside of the negative leader 116. The negative leader 116 includes a pod-holder portion 124 attached to the leading edge of the negative 110, and a pull portion 126 at the end of the leader connected to the pull tab 122. The width of the pull portion 126 is somewhat reduced to facilitate its threading between the bite of the pressure rollers 128', 130' and 128'', 130'' shown in Figs. 11,12, respectively. The positive leader 114 includes a mask portion 132 provided with a rectangular opening 134 for defining the picture area of positive 112. The leader 114 also includes a connector portion 136 by which the positive is connected to the pull portion 126 of the negative leader 116. The lengths of leader portions 124, 126 and 136 are such that as they are drawn from the camera, the coated surfaces 118 and 120 of the negative and positive, respectively, face each other and may be placed in contacting registration so that a latent image on the negative can be transferred to the positive 112 completely filling the area defined by the aperture 134. The film unit 100 further includes a frangible pod 138 containing processing liquid for effecting the diffusion transfer process between the negative and positive, a skirt 140 on the trailing edge of the mask 132, an extension 142 attached to the trailing edge of the negative 110 and rails 144 attached to the undersurface of the mask 132. The rails 144 cooperate with the skirt 140 and extension 142 to form a reservoir to capture and retain excess processing fluid that would otherwise be extruded at the trailing edge of the film unit 100 as it is withdrawn from a camera. The film leader 114 of the unit illustrated in Fig. 6 carries machine readable indicia 170 illustrated as a bar code which, like the magnetic indicia 64 of Fig. 1, carries information relating to film type, speed and/or imbibition tine, etc. The indica 170, being carried on the leader 114, is read in the camera as film 100 is drawn from the camera as later explained in more detail in regard to Fig. 11. As shown in Fig. 7, the film unit 100 can alternately carry indicia 170' mounted on the positive 112 which is read in the camera as later explained in detail in regard to Fig. 12. Additionally, a bar code 174 or other indicia may alternatively be provided on the pull tab as shown on a pull tab 122' in Fig. 9 and in Fig. 12. This tab indicia may also be provided as a set of apertures 174'. As shown in Figs. 8 and 11,12, a container 140 for peel-apart film includes a main housing 142, a top 144 and a pressure plate 146. In the bottom wall of the main housing 142 there is a long rectangular exposure opening 148 (Fig. 11 and 12) through which light from the scene being photographed can be focused on the coated surface 118 of the negative 110. The main housing 142 also has an exit opening 150 in the transverse end wall 152 through which a film unit 100' can be withdrawn from the container 140 subsequent to exposure for processing. More particularly, the side walls of the main housing 142 are provided with spring receiving notches (not shown) into which spring tabs 154 punched from the top 144 extend when the top 144 is in position over the main housing 142. Tabs 154 have considerable length so as to project into the interior of the housing and into engagement with the pressure plate 146. Further, the top 144 is provided with a relieved portion defined by two rectangular cut-outs 156 that merge with a trapezoidal cut-out 158 adjacent exit opening 150. The top 144 further includes an extension 160 between the cut-outs 156. At the free end of the extension 160 is a block of frictional material 162 such as polyurethane foam. Such a film container is shown in more detail in US-A-3,479,184. As shown in Fig. 8, the indicia 170' illustrated in Fig. 7 will be presented at the cut-out 156 for reading while the positive is manually advanced within the container 140 in the usual manner for peel-apart film following exposure. Even though a single film unit 100 is shown in Figs. 11 and 12 for the sake of clarity, it is to be understood that the film container 140 will initially enclose a dark slide (not shown) and a plurality of film units 100. In accordance with the present invention, the dark slide and each film unit would be provided with the indicia 170 or 170' so that camera adjustment information is provided in advance of each exposure. The provision of indicia on each film unit allows a film pack or container to be partially used, removed from the camera and later reinserted into the camera, because the next successive film unit has indicia which the camera will read. The film arrangement of Fig. 6, having indicia 170 carried on the leader portion 186, is shown in Fig. 11 within a camera 164' having a relatively narrow angle reading device 172' located in a position between the peel-apart film container 140 and the roller 128'. As shown in Fig. 11, following exposure, with the tab 122 pulled in a conventional manner in the direction of the arrow A, the leader portions 126 and 136 are fed to the rollers 128' and 130' As the leader portion 136 is drawn between the rollers 128' and 130' gas shown in Fig. 11, the bar code indicia 170 passes beneath the stationary reading device 172'. The relative movement between the indicia 170 and the reading device 172' allows the stationary reading device 172' to scan the entire length of the indicia 170. Since the bar indicia 170 is scanned in this embodiment after exposure of the film unit, the scanned information may include post-exposure information such as imbibition time for that particular film unit and exposure information such as film sensitivity for the next film unit in the container. The reading device 172 can also be employed for reading the indicia 170 illustrated in Fig. 7 as the positive passes the reading device during film withdrawal. The bar code 170 of Fig. 6 may alternatively be located on the back of the negative 118 or on the undersurface of the leader portion 126 connected to the negative of a film unit. However, when the bar code is so located, a reading device for scanning the bar code must be located to one side of the pull tabs and below the ejection path of the film unit rather than above it as shown in Fig. 11. Additionally, it should be noted that when placement of the indicia is provided as in either Fig. 6 or Fig. 7, the dark slide would also carry identical or at least similar indicia (perhaps with supplemental information) oriented on the dark slide to replicate the position of the film indicia during camera operation. Further similar arrangements may be provided for the integral film. Thus, the indicia 64 of Fig. 1, provided on the dark slide 34, could be located over the pod area (not shown) of the integral film, with each film carrying similarly oriented indicia. Then the dark slide and each film unit would be read as they are advanced from the film cassette. For integral film, the indicia may be carried on the upper or lower surface of the pod or trap area, or on the opaque base of the film unit. Since there is very little longitudinal room in the pod or trap area, several reading heads or one wide angle reading head would be used to read information carried transversely across the pod or trap. Preferably, however, the indicia is oriented longitudinally on the film unit. Thus, the indicia may be located in a variety of alternate positions on either type of film units to be read by a fixed head during film movement, and the indicia can carry exposure and post-exposure information for itself where stationary reading is employed, and exposure information for the next film unit where film advancement is employed. For integral film, a small cut-out may be provided in the cassette body overlying indicia in the pod margin of the film unit so that each film unit may be read in the camera. As previously noted, the machine readable indicia may alternately be carried on the peel-apart film pull tab as illustrated in Figs. 9 and 10. Bar code type of indicia 174 shown on tab 122' in Fig. 9 is shown in a camera 164'' in Fig. 12. Herein, a reading head or reading device 168 is mounted in adjoining relation to the tab path beneath roller 130'' to provide camera controlling information as the tab is manually advanced from the camera. As illustrated in Fig. 10 on a pull tab 122'', apertures 174' may be utilized rather than a magnetic stripe or optical bar code. For the aperture arrangement, a pass-through sensor system (not shown), i.e., a spaced infrared source and infrared sensor, would be mounted for passage of the tab therebetween. It should be noted that, in an arrangement similar to that illustrated and described with regard to the camera of Figs. 1-5, the cameras 164' and 164'' of Figs. 11,12, respectively, carry a microprocessor chip (not shown) on either the camera back or camera body for receiving the information from the reading device and automatically setting the camera exposure value, imbibition time, etc. In the preferred embodiment, a single indicia strip providing one or more values is carried on one or more of the sheet units of a film pack or cassette. However, more than one strip may alternately be provided where signals representing different variables are to be conveyed to the camera, i.e., different exposure values, etc., or exposure and post-exposure values. For example, both indicia 170 and 170' of Figs. 6 and 7, respectively, could be provided on the same sheet and read either by differently located reading heads or the single head 172' of Fig. 11. Further, it should be noted that while the exposure value or camera setting for the next film sheet must be retained by the camera until that exposure (which may be a long period of time) post-exposure information or adjustment may be immediately utilized. Thus, for an exposure value reading made after an exposure, the camera may be mechanically or electrically adjusted or the setting maintained in an electronic memory. For post-exposure information such as imbibition time, a down counter with an audible or visual signal can be set and started in response to the reading of the information. Thus, it will be appreciated that as a result of the invention, a highly effective system is provided for camera adjustment to accommodate different film variables and by which the principal objective among others is completely fulfilled. Also, it wil be apparent to those skilled in the art and it is contemplated that variations and/or changes in the embodiments illustrated and described herein may be made without departure from the present invention as defined in the claims. Accordingly, it is intended that the foregoing description is illustrative only, not limiting, and that the scope of the present invention will be determined by reference to the appended claims.

Claims: A method of adjusting a camera (10) in accordance with the value of at least one film variable representative of a property of film units (32) inserted as a film pack (12) into the camera for exposure and treatment of each exposed film unit in succession, said film pack (12) being covered with a dark slide (34) provided with machine readable indicia (64; 64') corresponding to the value of the film variable, said method comprising the steps of: discharging said dark slide (34) from the camera to present a first of said film units (32) for exposure; reading, by means of a reading device provided in the camera, said indicia responsive to said discharging movement of said dark slide (34) to generate one or more signals corresponding to the value of the film variable; and adjusting the camera under the control of said signals. A method of adjusting a camera (10) in accordance with the value of at least one film variable representative of a property of film units (100) inserted as a film pack (12) into the camera for exposure and treatment of each exposed film unit in succession, at least a first of the film units (100) being provided with machine readable indicia (170; 174; 174') corresponding to the value of the film variable, said method comprising the steps of: discharging said first film unit (100) from the camera after exposure and treatment of said first film unit; reading, by means of a reading device provided in the camera, said indicia responsive to the discharging movement of said first film unit (100) to generate one or more signals corresponding to the value of the film variable; and adjusting the camera under the control of said signals. A film pack (12) comprising at least one photographic film unit (32) for use with a photographic apparatus (10) including means for exposing the film unit, means (50) for treating the exposed film unit to enable production of a viewable image, and a reading device (66; 80) for reading machine readable indicia (64; 64'), the film pack further comprising: a container (14) retaining said at least one film unit (32) which has a known value of at least one film variable representative of a property of said at least one film unit, said container having a first opening (30) for discharging said film unit from said container, and a second opening (26) defining an exposure window; a removable dark slide (34) mounted in said container in light blocking relation to said film unit; said dark slide (34) carrying machine readable indicia (64; 64') corresponding to the value of the film variable; said indicia (64; 64') being located in a position which passes the reading device (66; 80) during removal of said dark slide (34) from said container (14). A film pack (12) comprising a plurality of photographic film units (100) for use with a photographic apparatus (10) including means for exposing the film units, means (128, 130) for treating the exposed film units to enable production of a viewable image, and a reading device (168) for reading machine readable indicia (170; 174; 174'), the film pack further comprising: a container (14) retaining said plurality of film units (100), and including a first opening (30) for discharging of said film units in succession from said container, and a second opening (26) defining an exposure window; at least a first of said film units (100) carries machine readable indicia (170; 174; 174') corresponding to the value of a film variable representative of a property of at least said first film unit; said indicia (170; 174; 174') being located in a position which passes the reading device (168) during a discharging movement of said at least first film unit (100) from said container (14). The film pack of claim 4, wherein at least a portion of said indicia of said first film unit corresponds to a film variable pertaining to itself whereby said apparatus is automatically adjusted for the discharging movement. The film pack of claim 5, wherein said portion of said indicia corresponds to a film variable applicable to treating of said exposed film unit. The film pack of claim 6, wherein said portion of said indicia corresponds to the imbibition time applicable to the treating of said exposed film unit. The film pack of claim 6, wherein at least another portion of said indicia of said first film unit corresponds to a film variable related to exposure of the next successive film unit. The film pack of claim 3, wherein at least a portion of said indicia carried by said dark slide corresponds to a film variable relating to exposure of the next successive film unit. The film pack of claim 4, wherein at least said first film unit (100) includes a leader portion (114) and said indicia (170) is located on said leader portion. The film pack of claim 4, wherein said container (140) includes another opening (156) in a wall (144) opposite said exposure window (148), said film units are stacked within said container (140) with one section (134) thereof arranged for sequential presentation at said exposure window (148) and another section (114) arranged for synchronous presentation at said another opening (156), said indicia (170) being located on said another section of said one film unit for presentation of said indicia for reading (172) by said camera at said other opening upon advancement of the said one film unit. The film pack of claim 4, wherein each of said plurality of film units carries said indicia. The film pack of claim 4, wherein the indicia of at least said first film unit corresponds at least in part to an exposure variable applicable to the next successive film unit for adjusting the apparatus for said next successive film unit as the preceding film unit is advanced. The film pack of claim 4, wherein the indicia of at least said first film unit corresponds at least in part to a post-exposure variable. A photographic device comprising: a chamber for enclosing a plurality of sheet units (32, 34; 100), at least some of which are photographic film film units (32; 100) having a light-sensitive surface and a known value of at least one film variable, at least a first of said sheet units carrying machine readable indicia (64; 170), means for advancing said sheet units, means for presenting said sheet units in succession at an exposure position and for defining a given path for advancement of said sheet units from said exposure position to present the next successive sheet unit at said exposure position, a stationary reading device (66; 172) located along said given path for reading said indicia (64; 170) of at least said first sheet unit during advancement thereof, and for developing a signal responsive to said indicia, and adjusting means responsive to said signal for adjusting operation of the photographic device to at least one film variable represented by said indicia. A photographic camera (10) comprising the photographic device of claim 15 and further comprising an objective lens (40) and shutter means (46). A camera back comprising the photographic device of claim 15. The photographic device of claim 15, including means for varying the exposure of said film units, and wherein said adjusting means includes means for adjusting said exposure varying means responsive to the signal from said reading device. The photographic device of claim 15, including film treating means for treating each exposed film unit to facilitate production of a viewable image, and wherein said adjusting means includes means for adjusting said film treating means responsive to the signal from said reading device. The photographic device of claim 19, wherein said film treating means comprises means for defining the imbibition period of a film unit and said adjusting means includes means for setting the timing means for controlling said period defining means to adjust the defined period responsive to the signal from said reading device. The photographic device of claim 15 or 19, wherein said indicia comprises a magnetic recording strip (64) aligned on each of a plurality of said sheet units in the direction of unit advancement, and said reading means comprises a magnetic reading head supported by said photographic device in position to read said magnetic strip as its associated unit is advanced from said container. The photographic device of claim 15 or 19, wherein said indicia comprises an optically readable strip aligned on each of a plurality of said sheet units in the direction of unit advancement, and that reading means comprising optical reading means carried by said photographic device in position to read each said optical strip as its associated unit is advanced from said container. A photographic system comprising a photographic device as defined in claim 15 and a film pack as defined in any of claims 3-13. The system of claim 23, wherein said indicia comprises a magnetic recording strip (64) aligned on said dark slide (34) in the direction of slide movement, said reading device comprising a magnetic reading head (66) supported by said photographic device in position to read said magnetic strip. The system of claim 23, wherein said indicia comprises an optically readable strip aligned on said dark slide in the direction of slide movement, said reading device comprising optical reading means carried by said photographic device in position to read said optical strip.

Inventors: HUDSPETH, WILLIAM, SLAVITTER, FREDERICK
Applicants: POLAROID CORPORATION
Application year: 1987
Main classification: G03B7
IPC codes: G03C8, G03C7, G03C3, G03B7, G03B17