In 1988, multiple configurations were introduced to suit different uses and price ranges. The design, which prioritizes operability and stability, has expanded its range of applications.
D-20
The D-20 is a compact portable CD player built on the same platform. It features simple controls and a slim design, and supports basic CD playback. The transport mechanism is shared across multiple models from the same period. It lacks vibration damping and is intended for use in a stable environment. Its configuration is simplified and serves as a standard base for derivative models.
D-30
The D-30 is a mid-range portable CD player built on the same platform as the D-20. The transport mechanism and body size are the same, but the exterior finish and control system configuration have been partially revised. Playback functions are within the range of a standard CD player, and it does not have a vibration-damping mechanism. Its functional configuration is positioned between a simplified model and a higher-end model, differentiating its configuration while maintaining basic performance.
D-40
The D-40 is a portable CD player based on the D-20, with a revised exterior and finish. While maintaining a compact chassis and basic controls, the exterior quality and detailed configuration have been adjusted. Playback is within the range of a standard CD player, and it does not have vibration damping. Its configuration is positioned between entry-level and higher-end models, differentiating it through exterior and finish while maintaining basic functionality.
D-82
The D-82 is a portable CD player that supports only 8cm CDs. Its compact size is achieved by supporting smaller discs, and it does not support standard 12cm CDs. Playback is limited to that of a basic CD player, and it lacks vibration damping. Its design prioritizes miniaturization and is defined by limited media compatibility.
D-88
The D-88 is a portable CD player with a compact chassis that supports playback of 12cm and 8cm CDs. Its size is smaller than the disc diameter, and when playing a 12cm CD, part of the disc is exposed at the outer edge. Playback is limited to that of a standard CD player, and it lacks vibration damping. Its design prioritizes miniaturization, resulting in a unique chassis with physical constraints.
D-150
The D-150 is a portable CD player with improved vibration resistance and power supply configuration. It features an early shock protection mechanism to reduce skipping during playback. The power supply system has been revised, improving portability. Playback remains within the range of a standard CD player and uses basic controls. The improved vibration resistance positions this model for portable use.
In 1988, portable CDs became a practical design. However, the limitations imposed by the disk structure remained.
