Track position detecting mechanism

A track position detecting mechanism for a magnetic disc recording and/or reproducing apparatus having at least a magnetic head for recording and/or reproducing signals on and/or from a magnetic disc, said track position detecting mechanism comprising:

• a carriage including a base and movable in a radial direction of the magnetic disc, said base having a surface on which the magnetic head is mounted;
• guide means including a guide shaft which extends in the radial direction of the magnetic disc under a guidance of said carriage;
• driving means for driving said carriage in the radial direction of the magnetic disc under a guidance of said guide means;
• optical detector means including a light emitting element and alight receiving element, said optical detector means having a fixed position and forming an optical path between the light emitting element and the light receiving element;
• and
• an interrupt member provided on said carriage at such a position that said interrupt member interrupts said optical path within said optical detector means when the magnetic head is located at an outermost peripheral track position on the magnetic disc,
• said optical path coinciding with a plane which includes a center axis of said guide shaft, said plane being parallel to said surface of said base of said carriage,
• said driving means including a motor and a screw which penetrates a portion of said carriage and is rotated by the motor, said screw extending parallel to the guide shaft,
• said optical detector means being arranged directly above said screw.

A track position detecting mechanism for a magnetic disc recording and/or reproducing apparatus having at least a magnetic head for recording and/or reproducing signals on and/or from a magnetic disc, said track position detecting mechanism comprising:

• a carriage including a base and movable in a radial direction of the magnetic disc, said base having a surface on which the magnetic head is mounted;
• guide means including a guide shaft which extends in the radial direction of the magnetic disc for guiding said carriage;
• driving means for driving said carriage in the radial direction of the magnetic disc under a guidance of said guide means;
• optical detector means including a light emitting element and a light receiving element, said optical detector means having a fixed position and forming an optical path between the light emitting element and the light receiving element;
• and
• an interrupt member provided on said carriage at such a position that said interrupt member interrupts said optical path within said optical detector means when the magnetic head is located at an outermost peripheral track position on the magnetic disc,
• said optical path coinciding with a first plane which is in a vicinity of and is parallel to a second plane which includes a center axis of said guide shaft, said second plane being parallel to said surface of said base of said carriage,
• said driving means including a motor and a screw which penetrates a portion of said carriage and is rotated by the motor, said screw extending parallel to the guide shaft,
• said optical detector means being arranged directly above said screw.