GB1597542A - Photographic film cassette - Google Patents

Description

(54) PHOTOGRAPHIC FILM CASSETTE (71) I, BERNARD ALBERT SECKEN DORF, of 144-23, 77th Avenue, Flushing, New York 11367, United States of America, a citizen of the United States of America, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to a photographic film cassette.

The present invention provides a photographic film cassette comprising a cylindrical container having a circular bottom, a circular piece of photographic film supported in the cassette substantially parallel to the bottom of the cassette and means fixed to the cassette and adapted to be engaged by means for rotating the cassette for successive exposure of sectors of the film therein.

The cassette 'according to the invention may in particular be used in the wrist camera which is the subject of my co-pending application no. 5217/78. (Serial No.

1597541.) The means fixed to the cassette may comprise a gear fixed to the bottom of the cassette.

The cassette may further comprise a first circular cover for the cassette, an aperture formed through the first cover, the axis of the aperture being spaced a predetermined distance from the axis of the container, a second circular cover, means mounting the second cover for rotation relative to the first cover and both covers for rotation of the container relative to both covers, an aperture formed through the second cover, the axis of the aperture being spaced from the axis of the cassette by the aforementioned predetermined distance, whereby the apertures in the covers can selectively be brought into or out of mutual alignment.

The cassette may further comprise means for holding the apertures of the covers in mutual alignment when the container is rotated in one direction and for holding the apertures of the covers out of mutual alignment when the container is rotated in the opposite direction.

The invention will be further described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 is an exploded isometric view of a wrist camera; Figure 2 is an isometric view, partly broken away, of the cassette having a gear fixed to the back thereof in combination with a gear in the casing for rotating the cassette; Figure 3 is a plan view of the container portion of the cassette, showing the interior of the cassette; Figure 4 is a section taken on section line 4-4 of Figure 3; Figure 5 is a plan view of the open cover of the casing, showing the shutter mechanism; Fig. 6 is a section taken on section line 66 of Fig. 5; Fig. 7 is a plan view of the underside of the upper cover of the cassette; and Fig. 8 is a plan view of the underside of the member interposed between the cassette and the shutter mechanism.

With reference to Fig. 1, it is seen that the wrist camera 10 consists of a casing base 11 and a casing cover 12. A wrist strap 13 is received through slots 14 and 15 in ears 16 and 17 formed on the casing base 11.

Between the slots 14 and 15, the wrist strap 13 passes behind the casing base 11. For convenient, comfortable wearing, the dimension of the casing from one lateral extremity to another in the direction of wrist strap 13 is generally less than the diameter of the wearer's wrist. Lugs 18, 19 and 20 are formed on the rim 21 of the casing base 11. Lugs 22, 23 and 24 are formed on the cylindrical side wall 25 of the casing cover 12. The lower edge of the cylindrical side wall 25 is received in an annular groove 25a formed in the rim 21 of the casing base 11, thereby providing a light seal. A pin 26 passes with a snug fit sequentially through lugs 22, 18 and 23 and a pin 27 passes with a snug fit sequentially through lugs 19, 24 and 20, thereby to secure the casing cover 12 onto the casing base 11.

Contained in the casing base 11 are a cassette container 28, a cassette lower cover 29 and a cassette upper cover 30. A disc shaped member 31 is fixed in the casing cover 12.

A gear 33 is formed on the back of the bottom 34 of the cassette 28 (Fig. 2). A blind axial bore 103 is formed in the gear 33. A slot 35 is provided through a side wall 36 of the casing base 11 (Fig. 1). Rotatably mounted therein by means of a pin 37 is a gear 38 which meshes with the gear 33. It is seen that the gear 38 extends partially within and partially without the casing base 11.

The cassette consists of the container 28 in combination with the lower cover 29 and the upper cover 30. These three elements are mounted for relative rotation by means of a pin 39. The pin is slidably received in a axial hole 40 through the upper cover 30 and in an axial hole 41 through the lower cover 29. The pin 39 is finally, tightly received in a blind axial hole 42 in the container 28. A cylindrical boss 43 is formed axially on the interior bottom wall 44 of the casing base 11 and is received in the bore 103 to serve as a stub axle upon which the container 28 is rotatable.

A cylindrical boss 45, through which is formed a hole 41, is provided on the upper face 46 of the lower cover 29 to serve as a bearing for relative rotation between the lower cover 29 and the upper cover 30.

Apertures 47, 48 and 49 are formed through respective elements 29, 30 and 31. It can be readily seen that the entire assembly has a common axis. Each of the apertures 47, 48 and 49 is spaced from that axis by the same distance. Through the face 50 of the casing cover 12 is provided a conventional camera lens 51. The axis of this lens is spaced the same distance from the aforementioned common axis as are the apertures 47, 48 and 49. Thus, the three apertures 47, 48 and 49 and the lens 51 can be aligned.

Formed on the interior bottom wall 52 of the container 28 are five cylindrical bosses 53, 54, 55, 56 and 57 (Figs. 1 and 3). The boss 57 is axially located and has the blind hole 42 formed therein and the bosses 53, 54, 55 and 56 are equidistantly spaced thereabout.

Formed on the interior cylindrical wall 58 of the container 28, equidistantly spaced and radially interposed between the bosses 53, 54, 55 and 56, are lugs 59, 60, 61 and 62 (Fig. 3).

A disc of photographic film 63 (shown in Fig.

4 but not shown in Fig. l) is supported above and parallel to the interior bottom wall 52 of the container 28 by resting on the bosses 53, 54, 55, 56 and 57. From above, the disc 63 is held in place by the lugs 59, 60, 61 and 62. In this respect. it will be appreciated that the distance between the plane in which the bottoms of the lugs 59, 60, 61 and 62 lie and the plane in which the tops of the bosses 53, 54, 55, 56 and 57 lie is slightly greater than the thickness of the disc 63. An aperture 102 is formed through the center of the disc 63.

The aperture permits passage of the pin 39 and also serves another function, which is described hereinafter.

On the upper face 46 of the lower cover 29 are formed a pair of diametrically opposed like protrusions 64 and 65 (Fig. 1). Similarly, on the lower face 66 of the upper cover 30 are formed a pair of diametrically opposed like protrusions 67 and 68 (Fig. 7). On the upper face 69 of the upper cover 30 is formed a single like protrusion 70 (Fig. 1). Finally, on the lower face 71 of the disc shaped member 31 is formed yet another like protrusion 72 (Fig. 8). Each of the protrusions 64, 65, 67, 68, 70 and 72 is oriented substantially radially and is located substantially the same distance from the common axis of the cassette and the camera casing as the other protrusions.

The disc shaped member 31 is fixed in the casing cover 12 with the axis of the aperture 49 therein in alignment with the axis of the lens 51. Only when the side 73 of the protrusion 70 abuts against the side 74 of the protrusion 72, are the apertures 48 and 49 in axial alignment. At other rotational orientations of the upper cover 30 relative to the disc shaped member 31, including when the side 75 of the protrusion 70 is abutting against the side 76 of the protrusion 72, the apertures 48 and 49 are out of alignment. Only when the side 77 of the protrusion 67 and the side 78 of the protrusion 68 abut respectively against the side 79 of the protrusion 64 and the side 80 of the protrusion 65, are the apertures 47 and 48 in axial alignment. At the same time, if the side 73 of the protrusion 70 is abutting against the side 74 of the protrusion 72, the apertures 47 and 48 are in axial alignment with the aperture 49.

A shutter 32 consists of an integral member pivotally mounted in the casing cover 12 by means of a pin 100 which passes through an aperture 32a provided in the shutter 32 (Fig. 5). Stopping members 101 and 81 are integrally formed in the casing 12 to limit the pivotal movement of the shutter 32. One portion of the shutter 32 is a permanent magnet 82 radially oriented with one of its poles adjacent the pivot pin 100 and the other of its poles adjacent the periphery of the casing cover 12. The other portion of the shutter 32 is a shutter leaf 83 having an aperture 84 formed therein. For illustrative purposes, in Fig. 5 part of the leaf 83 has been broken away to show the aperture 85 in the casing cover 12 for the lens 51. The apertures 84 and 85 are equidistantly spaced from the axis of the pin 100 so that the apertures are alignable. Such a shutter mechanism is described and claimed in cop enduing application no. 8008 179 (Serial no.

1597543).

Arcuate members 86 and 87, in which there is formed a track 88, are fixed to the periphery of the casing cover 12 (Figs. 5 and 6). At the ends of the outer periphery of the track 88 are formed notches 89 and 90. A shutter actuating assembly 91 is mounted for reciprocation along the track 88. The assembly 91 consists of a pin 92 formed with a head 93 and a shank 94, shoulders 95, 96 formed on the shank 94, a cylindrical permanent magnet 97 axially extending from the shank 94 and being slideably received in the blind bore 98 in the shank 94. A helical spring 99 is received in the bore 98 with one end thereof abutting against the base of the bore 98 and the other end thereof abutting against the end of the magnet 97 received in the bore 98, whereby the magnet 97 is biased against the outer periphery of the casing cover 12. The shoulders 95 and 96 are dimensioned to be received in the notches 89 and 90.

Operation of the wrist camera, film cassette and shutter mechanism will hereinafter be described.

A cassette according to the invention is assembled in darkroom facilities and leaves the darkroom facilities with the apertures 47 and 48 out of alignment so that the film 63 in the cassette is not exposed. The casing cover 12 is removed by pushing out the pins 26 and 27. The cassette is then inserted into the base 11 with the boss 43 received in the bore 103 in the gear 33 and the teeth of the gear 38 engaging the teeth of the gear 33. The cover 12 is then fastened back in place by means of reinsertion of the pins 26 and 27. The gear 38 is then rotated clockwise (as viewed in Fig. 1) with one's thumb. The clockwise rotation of the gear 38 results in counterclockwise rotation of the cassette container 28 by virtue of engagement of the gear 38 with the gear 33.

Frictional engagement of the lower cover 29 with the edge of the container 28 results in the cover 29 being carried in a counterclockwise direction along with the container 28. When the aforementioned abutting relationships between the various protrusions formed on the covers 29 and 30 and the disc shaped member 31 have been brought about due to the aforementioned counterclockwise rotation, the apertures 47, 48 and 49 are in axial alignment as hereinabove described. To "snap" a picture, the wrist camera is aimed at the subject, the assembly 91 is depressed to release the shoulders 95 and 96 from the notch 89, and the assembly 91 is slid along the track 88 until the shoulders 95 and 96 snap into the notch 90. The permanent magnet 97 has been arranged with one of its poles adjacent the periphery of the casing cover 12 and the other of its poles received in the bore 98, the pole adjacent the periphery of the casing cover 12 being a pole like the pole of the magnet 82 adjacent the periphery of the casing cover 12, that is, both are North or both are South. Each of the magnets 82 and 97 has an imaginary axis connecting the centers of the poles of the magnet which are at the ends of the magnet. Hence, when the assembly 91 is slid from the notch 89 to the notch 90, as the axis of the magnet 97 passes the axis of the magnet 82, magnetic repulsion snaps the magnet 82 in the clockwise direction as viewed in Fig. 5 until the magnet 82 comes to rest against the stop 101, magnetic repulsion holding the magnet 82 in that position. Of course, at the same time, the leaf 83 is also rotating in the clockwise direction (as viewed in Fig. 5). Hence, the aperture 84 in the leaf 83 passes momentarily into alignment with the aperture 85 containing the lens 51 and an exposure is therefore made. When the assembly 91 is held in place at notch 89 or at notch 90, magnetic repulsion holds the shutter 32 stationary against stopping member 81 or stopping member 101, respectively. Hence, the cooperation between the assembly 91 and the notches 89 and 90 prevents accidental actuation of the shutter 32. The user then rotates the gear 38 again in the clockwise direction as viewed in Fig. 1. The covers 29 and 30 of the cassette are held in place by the counterclock-wise torque thus applied, due to the above described abutment of the various protrusions on the upper and lower covers 29 and 30 and the disc shaped member 31 while the container portion 28 of the cassette rotates to bring a subsequent sector of the disc of film 63 into alignment with the apertures 47, 48 and 49. Then, the assembly 91 is moved back to its original position, resulting in another actuation of the shutter by magnetic repulsion. The aforementioned operations are repeated until all of the sectors on the disc of film 63 have been exposed. At this point, the user rotates the gear 38 in the counterclockwise direction as viewed in Fig. 1.

Frictional contact between the periphery of the container portion 28 of the cassette and the lower cover 29 thereof causes the lower cover 29 to rotate in the clockwise direction with the container 28, thereby carrying the aperture 47 out of alignment with the aperture 48. Then, the cover 12 can be removed from the base 11 by removing the pins 26 and 27 and the cassette can be removed from the camera without further exposure of the film.

The cassette can then be developed without the benefit of darkroom facilities. When the cassette is immersed in a developing fluid, the developing fluid may enter the cassette by passing through the aperture 48 in the upper cover 30 and then through the aperture 47 in the lower cover 29 into the container 28. The developing fluid then contacts the photographic emulsion on the top side of the film disc 63. Also, because the film disc 63 is provided with an aperture 102 and is held above the bottom wall 52 of the container 28 by the bosses 53 to 57 inclusive, and the lugs 59 to 62, inclusive, the developing fluid will also pass through the aperture 102 and circulate under the film disc 63.

While the invention has been particularly described with reference to a certain specific embodiment thereof, it is to be understood that this embodiment is intended to illustrate rather than to limit the invention. For example, while the camera has been illustrated without a view finder, it is apparent that any conventional view finder may be incorporated. Also, the gear 38 may be provided with indicia to assist the user in locating successive sectors of a disc of film for exposure. Furthermore, any of various conventional means may be incorporated to vary the aperture opening to adjust the exposure to varying light conditions and different types of film. Moreover, the camera may be combined with a watch, the lens being mounted in the face of the watch.

WHAT I CLAIM IS: 1. A photographic film cassette comprising a cylindrical container having a circular bottom, a circular piece of photographic film supported in the cassette substantially parallel to the bottom of the cassette and means fixed to the cassette and adapted to be engaged by means for rotating the cassette for successive exposure of sectors of the film therein.

2. A cassette as claimed in Claim 1, in which the means fixed to the cassette comprises a gear fixed to the bottom of the cassette.

3. A cassette as claimed in Claim I or 2, further comprising a first circular cover for the cassette, an aperture formed through the first cover, the axis of the aperture being spaced a predetermined distance from the axis of the container, a second circular cover, means mounting the second cover for rotation relative to the first cover and both covers for rotation of the container relative to both covers, an aperture formed through the second cover, the axis of the aperture being spaced from the axis of the cassette the said predetermined distance, whereby the apertures in the covers can selectively be brought into or out of mutual alignment.

4. A cassette as claimed in Claim 3, further comprising means for holding the apertures of the covers in mutual alignment when the container is rotated in one direction and for holding the apertures of the covers out of mutual alignment when the container is rotated in the opposite direction.

5. A cassette as claimed in Claim 4, in which an aperture is formed through the center of the circular piece of film and the cassette further comprises means for supporting the film above the bottom of the cassette, whereby developing fluid may enter the cassette through the apertures in the covers and may, therefore, flow over the top face of the film as well as through the aperture in the film and into contact with the bottom face of the film, the film thereby being developable without darkroom facilities.

6. A photographic film cassette according to Claim 1, substantially as herein described with reference to, and as shown in, the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. While the invention has been particularly described with reference to a certain specific embodiment thereof, it is to be understood that this embodiment is intended to illustrate rather than to limit the invention. For example, while the camera has been illustrated without a view finder, it is apparent that any conventional view finder may be incorporated. Also, the gear 38 may be provided with indicia to assist the user in locating successive sectors of a disc of film for exposure. Furthermore, any of various conventional means may be incorporated to vary the aperture opening to adjust the exposure to varying light conditions and different types of film. Moreover, the camera may be combined with a watch, the lens being mounted in the face of the watch. WHAT I CLAIM IS:

1. A photographic film cassette comprising a cylindrical container having a circular bottom, a circular piece of photographic film supported in the cassette substantially parallel to the bottom of the cassette and means fixed to the cassette and adapted to be engaged by means for rotating the cassette for successive exposure of sectors of the film therein.

2. A cassette as claimed in Claim 1, in which the means fixed to the cassette comprises a gear fixed to the bottom of the cassette.

3. A cassette as claimed in Claim I or 2, further comprising a first circular cover for the cassette, an aperture formed through the first cover, the axis of the aperture being spaced a predetermined distance from the axis of the container, a second circular cover, means mounting the second cover for rotation relative to the first cover and both covers for rotation of the container relative to both covers, an aperture formed through the second cover, the axis of the aperture being spaced from the axis of the cassette the said predetermined distance, whereby the apertures in the covers can selectively be brought into or out of mutual alignment.

4. A cassette as claimed in Claim 3, further comprising means for holding the apertures of the covers in mutual alignment when the container is rotated in one direction and for holding the apertures of the covers out of mutual alignment when the container is rotated in the opposite direction.

5. A cassette as claimed in Claim 4, in which an aperture is formed through the center of the circular piece of film and the cassette further comprises means for supporting the film above the bottom of the cassette, whereby developing fluid may enter the cassette through the apertures in the covers and may, therefore, flow over the top face of the film as well as through the aperture in the film and into contact with the bottom face of the film, the film thereby being developable without darkroom facilities.

6. A photographic film cassette according to Claim 1, substantially as herein described with reference to, and as shown in, the accompanying drawings.