Tape cassette with lid lock and tape characteristic indicating member

A tape cassette comprising:

• a casing for accommodating a pair of reels around which a tape is wound and having a front opening across which the tape is guided between the reels, said casing including upper and lower halves respectively defining top and bottom walls of the casing;
• a lid mounted on said casing for movement between an opened position uncovering said front opening and a closed position covering said front opening;
• a pedestal structure in said lower half of the casing having a raised portion which is elevated in respect to said bottom wall for defining a cavity underlying said raised portion and a support surface on said raised portion;
• a mounting pin projecting upwardly from said support surface of the pedestal;
• a lid-locking member pivoted on said mounting pin and including means engageable with said lid for locking said lid in said closed position, and means engageable by a lock-releasing member of a tape cassette apparatus for pivoting said lid-locking member so as to release said lid for movement to said open position;
• said casing further having a detecting hole opening at least through said bottom wall into said cavity under said raised portion of the pedestal structure;
• and
• an indicating member movable within said cavity for indicating a characteristic of the tape in the respective tape cassette by the position of said indicating member within said cavity in respect to said detecting hole.