Apparatus and method for protecting a magnetic layer on photosensitive material
First Claim
1. A cartridge for a photosensitive web material having a magnetic layer with a predetermined coercivity, the cartridge comprising a ferromagnetic material dispersed in a polymer, the composite material of the polymer and the ferromagnetic material having a magnetic permeability greater than 1.0, the magnetic layer of the photosensitive web being shielded from a magnetic field applied externally of the cartridge affecting the magnetic layer of the photosensitive web.
1 Assignment
0 Petitions
Accused Products
Abstract
A cartridge for protecting a magnetic layer on a photosensitive web material from a magnetic field. The cartridge comprises a ferromagnetic material dispersed in a polymer, the composite material of the polymer and the ferromagnetic material having a magnetic permeability greater than 1.0. The magnetic layer is shielded from a magnetic field applied externally of the cartridge, such as from an article surveillance system, which could affect recorded information on the magnetic layer.
33 Citations
29 Claims
- 1. A cartridge for a photosensitive web material having a magnetic layer with a predetermined coercivity, the cartridge comprising a ferromagnetic material dispersed in a polymer, the composite material of the polymer and the ferromagnetic material having a magnetic permeability greater than 1.0, the magnetic layer of the photosensitive web being shielded from a magnetic field applied externally of the cartridge affecting the magnetic layer of the photosensitive web.
- 9. A package comprising a film cartridge enclosing a web of photosensitive material having a magnetic layer with a predetermined coercivity, the package further comprising a marker positioned external to the film cartridge, the marker activatable by an activation magnetic field and deactivatable by a deactivation magnetic field, the magnetic fields applied externally of the film cartridge, the film cartridge comprising a dispersion of a polymer and a ferromagnetic material, the composite material having a magnetic permeability greater than 1.0, the film cartridge shielding the magnetic layer from the magnetic fields affecting the magnetic layer of the web.
-
19. An article of manufacture configured for cooperation with a camera, comprising:
-
a strip of photosensitive web material having a magnetic layer with a predetermined coercivity from about 250 to about 1150 oersted; a spool onto which the strip of photosensitive web is wound, the spool comprised of a non-ferromagnetic material; a shell comprising a ferromagnetic material dispersed in a polymer, the composite material of the shell having a magnetic permeability greater than 1.0, the shell having two opposing ends; a plurality of end caps, an end cap attached to each of the ends of the shell, the shell, spool, and end caps defining a light-tight film cartridge for cooperation with a camera, the magnetic layer of the photosensitive web positioned within the light-tight film cartridge being shielded from a magnetic field applied externally of the cartridge affecting the magnetic layer of the photosensitive web. - View Dependent Claims (20)
-
-
21. A method of protecting a web of photosensitive material having a magnetic layer with a pre-determined coercivity, the method comprising the steps of:
-
providing a film cartridge comprising a material having a magnetic permeability greater than 1.0, the web of photosensitive material enclosed within the film cartridge; shielding the magnetic layer of the photosensitive web from a magnetic field external of the film cartridge. - View Dependent Claims (22)
-
-
23. A method of protecting a web of photosensitive material having a magnetic layer, the method comprising the steps of:
-
providing a film package including a film cartridge comprising a material having a magnetic permeability greater than 1.0, a web of photosensitive material having a magnetic layer with a pre-determined coercivity from about 250 to about 1150 oersted enclosed within the film cartridge, and a marker attached externally to the film cartridge, the marker activatable by an activation magnetic field and deactivatable by a deactivation magnetic field, the magnetic fields applied externally of the film cartridge; activating the marker such that the marker is detectable by an interrogation article surveillance magnetic field external of the film cartridge; and deactivating the marker such that the marker is not detectable by the interrogation article surveillance magnetic field, the film cartridge shielding the magnetic layer of the photosensitive web from the activation and deactivation magnetic fields during said activating and deactivating. - View Dependent Claims (24, 25, 26)
-
-
27. An article of manufacture configured for cooperation with a camera, comprising:
-
a strip of photosensitive web material having a magnetic layer with a predetermined coercivity from about 250 to about 1150 oersted; a spool onto which the strip of photosensitive web is wound, the spool comprising a ferromagnetic material dispersed in a polymer, the composite material having a magnetic permeability greater than 1.0, a shell comprising a ferromagnetic material dispersed in a polymer, the composite material of the shell having a magnetic permeability greater than 1.0, the shell having two opposing ends; a plurality of end caps, an end cap attached to each of the ends of the shell, the shell, spool, and end caps defining a light-tight film cartridge for cooperation with a camera, the magnetic layer of the photosensitive web positioned within the light-fight film cartridge being shielded from a magnetic field applied externally of the cartridge affecting the magnetic layer of the photosensitive web. - View Dependent Claims (28, 29)
-
Specification