Tape cartridge of compatible type

A compatible type tape cartridge capable of recording and reading out large and small tape cartridges with different widths in common with a same tape driver, which comprise:

• a pair of right and left hubs for winding a tape arranged in a case of a main body, the pair of hubs being designed so that the tape winded off from one hub is winded around the other hub via tape guides arranged on the front, right, and left of the case of the main body and also being connected with start and terminal ends of the tape via leader tapes for detecting the tape ends.
• a passage for light injection and a passage for light ejecting of the tape end detection light opened respectively on a side wall of the case of the main body facing a tape traveling path between the tape guide and the hub, and
• an optical path inverted body facing the pair of passages and across the tape traveling path arranged in the case of the main body,
• wherein defining one of the upper an lower surfaces of the case of the main body as a reference surface, one of the passages for light injection and the passages for light ejecting in the large and small tape cartridges is formed at a prescribed distance from the reference surface, and upper and lower adjacent spaces between the passages for light injection and the passages for light ejecting in the large and small tape cartridges are different in response to a difference of widths and measurement of the case of the main body between the large and small tape cartridges.