Patent ID: 6576390
Filing Date: 2003-06-10
Classification: G03B,G03C,Y10T

Abstract:
A method of manufacturing instant photographic film units each including a mask sheet having an image frame and two sheets, one of which has a photosensitive layer, laminated and bonded together, and a developing liquid container disposed in a predetermined position for supplying a developing liquid between the two sheets to produce an image, comprising the steps of:bonding said mask sheet and said two sheets together in a predetermined laminated state, with at least one of said mask sheet and said two sheets being in the form of a continuous web; cutting off said continuous web into self-developed instant photographic film units of a predetermined length; automatically stacking a predetermined number of instant photographic film units; and automatically placing the stacked instant photographic film units in a film pack, wherein said film pack has a pack casing storing the instant photographic film units therein, a light shielding plate placed in said pack casing in facing relation to exposure surfaces of the instant photographic film units in said pack casing, and a lid fused to said pack casing, further comprising the step of: ultrasonically fusing said lid to said pack casing while said light shielding plate is being held in said pack casing in spaced relation thereto.