Abstract: An apparatus for detecting position of a reproducing transducer in a rotary recording medium reproducing apparatus which reproduces an information signal recorded in a rotary recording medium by a reproducing transducer which is transferred towards the radial direction of the rotary recording medium, comprises a single photo-detector having a light-emitting element and a light-receiving element, provided in a manner so as to be transferred unitarily with the reproducing transducer, a light interrupting plate provided at a fixed part of the rotary recording medium reproducing apparatus, for operating together with the photo-detector, and a position detection signal producing circuit for producing a position detection output signal according to an output of said photo-detector, to indicate that the reproducing transducer has passed a position corresponding to the outermost peripheral position and the innermost peripheral position of the recorded region in the rotary recording medium.

Abstract: A reproducing apparatus is capable of performing special reproduction of information signals recorded on a rotary recording medium. The information signals are recorded in either spiral track turns or concentric tracks. The reproducing apparatus comprises a detector for generating a rotation detection signal having a frequency which varies proportionally to the rotational speed of the rotary recording medium. A special signal generator generates a special reproduction synchronizing signal and a generator generates an external control signal based on a signal which is obtained by variably controlling the frequency of the special reproduction synchronizing signal. A manual switch varies the frequency of the special reproduction synchronizing signal by controlling the control signal generator responsive to an output code signal corresponding to a position of the manual switch.

Abstract: A case for a disc-shaped recording medium is used in a disc-shaped recording medium reproducing apparatus. The reproducing apparatus is provided with a turntable for rotating the disc-shaped recording medium, closing member locking mechanism provided at the innermost part of the disc-shaped recording medium reproducing apparatus, and N detection switches provided at the innermost part of the reproducing apparatus and disposed asymmetrically on the left and right sides with respect to a line which passes through the center of the turntable in the disc insertion direction. The case comprises a jacket for accommodating the disc-shaped recording medium, and a closing member for closing an opening of the jacket and being locked by the locking mechanism and confront the detection switches upon the disc-shaped recording medium being loaded into the reproducing apparatus.

Abstract: A state indicating device in a reproducing apparatus for reproducing a rotary recording medium recorded with signals which has been accommodated within a case, where the case has a space for accommodating the rotary recording medium, a jacket having an opening through which the rotary recording medium can enter or leave, and a lid plate inserted through the opening of the jacket to close the opening, and the reproducing apparatus has an inserting opening through which the case is inserted, a turntable for rotating the rotary recording medium, a lid plate locking mechanism and a rotary recording medium clamping mechanism respectively provided at the innermost part of the reproducing apparatus opposite to the inserting opening with respect to the turntable, a lowering and raising mechanism for lowering and raising the rotary recording medium between a position clamped by the clamping mechanism and a position on the turntable, reproducing device for reproducing recorded signals from the rotary recording medium,

Abstract: A rotary recording medium reproducing apparatus for reproducing a rotary recording medium in which an information signal consisting of a plurality of program contents and an address signal for discriminating a program number of the information signal are recorded, comprises a reproducing device for reproducing the information signal and the address signal from the rotary recording medium, a detection circuit for detecting the address signal from signals reproduced by the reproducing device, a setting circuit for setting a program number of a program which is to be reproduced after performing an automatic searching operation, a transferring device for transferring the reproducing means towards forward and backward directions on the rotary recording medium, and a comparator for comparing the program number set in the setting circuit with a program number of a program of the information signal being reproduced by the reproducing device, and producing and supplying a search signal to the transferring device so th