Abstract: A case for accommodating a disc-shaped recording medium such as CD or DVD is disclosed. The case included a front lid opened and closed and a body formed with a central button and a holder including an annular piece formed with an engagement groove for engaging a fixing hole of the disc-shaped recording medium with legs. The annular piece is disposed around the button and the holder further includes a spring portion. A force acting so that an upper side of the disc-shaped recording medium is pressed such that the recording medium is depressed and rendered against a force acting so that the button is pushed upward via a second hinge by the spring portion. As a result, the button is prevented from being pushed over its toggle dead point and the disc-shaped recording medium is re-fixed to the annular piece by reduction and/or elimination of the external force.

Abstract: A case for accommodating a disc-shaped recording medium such as CD or DVD is disclosed. The case includes a front lid opened and closed and a body formed with a central button and a holder including an annular piece formed with an engagement groove for engaging a fixing hole of the disc-shaped recording medium with legs. The annular piece is disposed around the button and the holder further includes a spring portion. A force acting so that an upper side of the disc-shaped recording medium is pressed such that the recording medium is sunk is rendered competitive against a force acting so that the button is pushed upward via a second hinge by the spring portion. As a result, the button is prevented from being pushed over its toggle dead point and so that the disc-shaped recording medium is re-fixed to the annular piece by reduction and extinction of the external force.

Abstract: A system for marking a singing voice and displaying a marked result for a karaoke machine. The system comprises a data storage means, a comparison and marking means, a display means, a control mean. The data storage means stores a standard singing voice data on a basis of which a singing voice of a singer inputted from a microphone is marked. The comparison and marking means compares the singing voice with the standard singing voice data and marks the singing voice. The display means displays a result of a score of the singing voice marked by the comparison and marking means, and has a course which is composed of a series of display units and a goal display. The control means controls the display means.