Patent ID: 6327032
Filing Date: 2001-12-04
Classification: F42B,G02B

Abstract:
An apparatus for imaging an ejector mark on a cartridge case comprising:a cartridge case holding device mounted to hold, in a predetermined orientation, a cartridge case at an imaging position;an imaging device mounted with an optical axis positioned to image the cartridge case at the imaging position;a light source mounted in a first predetermined position to illuminate the cartridge case at the imaging position from a first predefined angle of illumination and in a second predetermined position to illuminate the cartridge case at the imaging position from a second predefined angle of illumination; andthe holding device, the light source and the imaging device cooperating so that the imaging device can take a first image of the object with light for illumination from the first predefined angle of illumination and a second image of the object with the light from the second predefined angle of illumination;wherein said apparatus further comprises one of:a light diffuser placed between the light source and the cartridge case so that when the first and second images are taken some of the projected light is diffused around the cartridge case; anda diffuse light source placed to project diffuse light onto the cartridge case;whereby the images obtained can be used for comparative analysis.