In 1984, Sony's first Discman model was released to the market. CD audio became available for use outside the home, and a playback structure for portable environments was implemented for the first time.
D-50
The D-50 is Sony's first portable CD player, released in 1984. It does not have a built-in battery and operates by connecting an external battery pack. It features a line output and two headphone outputs, and supports basic CD playback functions. It lacks vibration damping, requiring a stable placement during playback. Due to its limited power supply, it was designed more for stationary use than for portability. It exhibits the limitations seen in early portable CD players.
By 1984, portable CD players had entered the practical stage. However, due to constraints on the device's structure and power consumption, clear limitations remained regarding its portability.
