Patent ID: 7841554
Filing Date: 2010-11-30
Classification: G11B

Abstract:
1. A recording tape cartridge comprising: a reel that has recording tape wound on the outer periphery of a circular cylindrical shaped hub; an engaged gear having a plurality of teeth disposed inside the hub around a circular circumference coaxial to the reel hub, with each of the teeth configured with a meshing face substantially parallel to the reel axis; a case having a top panel and a bottom panel that face each other, with the reel accommodated between the top panel and the bottom panel and movable along the axial direction; a brake member having a brake gear supported so as to be non-rotatable with respect to the case and so as to be meshable, at a meshing face substantially parallel to the reel axial direction, with the meshing face of the engaged gear, the brake member, by displacing with respect to the hub in the reel axial direction, adopting a rotation locking position in which the brake gear is meshed with the engaged gear, and a rotation permitting position in which the meshing is released; a guide member that restricts a displacement direction of the brake member with respect to the case to the reel axial direction; a first biasing member that biases the reel toward the bottom panel side and generates biasing force to bias the brake member to the rotation locking position; a plurality of lock members that are provided around the hub circumferential direction, the plurality of lock members adopting a restricting position that restricts movement of the reel in the axial direction by being inserted between an end portion at the top panel side of the reel and the top panel when the reel is in a state biased to the bottom panel side, and the plurality of lock members adopting a restriction released position that permits movement of the reel with respect to the case in the axial direction by retreating from the restricting position; a second biasing member that biases the lock members toward the restricting position; and a lock release mechanism that has a pressed portion provided to the plurality of lock members and a pressing portion provided to the brake member, the lock release mechanism moving the plurality of lock members from the restricting position to the restriction released position by the pressing portion pressing the pressed portion accompanying the movement of the brake member from the rotation locking position to the rotation permitting position.