Abstract: A reel table transferring mechanism for selectively loading tape cassettes of a different size includes rotating arms on which the reel tables are supported and a rotator for rotating the rotating arms. Thus, the position of and distance between the reel tables are determined by the rotation angle of the rotating arms.

Abstract: The invention provides an optical functioning device which emits and receives light, and a driver circuit for controlling the device with light. In the device, elements, in which semiconductor multilayer-film reflecting mirrors are provided at both the upper and lower ends of a pnpn structure of semiconductors and which have light-emitting and light-receiving functions to act as optical resonators, are integrated two-dimensionally each with electrodes which are provided for the and the transistors act as phototransistors into which light is introduced.