Magnetic tape cartridge

Abstract

A magnetic tape cartridge includes an opening 1 C through which a magnetic tape is drawn out, and a slide door 6 that slides along a sidewall 1 D provided with the opening 1 C to open and close the opening 1 C. The opening 1 C is provided in part of the sidewall 1 D across a lower half 1 A and an upper half 1 B of the cartridge case 1 . At least one of a lower half portion and an upper half portion of the sidewall is provided with a holding groove 1 L that receives a front end portion 6 A of the slide door 6 when the opening is closed. Therefore, the upper half 1 B and the lower half 1 A of the magnetic tape cartridge may be smoothly combined.

1 . A method of assembling a magnetic tape cartridge comprising the steps of: 
 providing an opening through which a magnetic tape is drawn out in part of a sidewall of a cartridge case across a lower half and an upper half of the cartridge case;    mounting a slide door that opens and closes the opening between guide portions each provided in the lower half and the upper half, while stressing the slide door with a spring member toward a position in which the opening is closed,    wherein the mounting step includes:    mounting the slide door stressed with the spring member toward the position in which the opening is closed by fitting a lower edge of the slide door into the guide portion of the lower half;    holding the slide door by pressing an appropriate spot of an end of the slide door facing a direction in which the slide door moves to close the opening so that the end of the slide door facing the direction in which the slide door moves to close the opening is prevented from rising out due to stress imposed by the spring member; and    combining the upper half with the lower half.    
     
     
         2 . A method of assembling a magnetic tape cartridge according to  claim 1 , wherein the appropriate spot for pressing the end of the slide door facing the direction in which the slide door moves to close the opening to hold the slide door is located above a straight line so extending as to join a contact point of one end of the spring member with the lower half and a contact point of the other end of the spring member with the slide door.  
     
     
         3 . A method of assembling a magnetic tape cartridge according to  claim 1 , wherein each guide portion provided in the lower half and the upper half is comprised of any one of a guide groove, a rib provided between the slide door and upper and lower edges of the opening in the sidewall in such a manner as to slidably hold the slide door, and a plurality of projections.