A CD mechanism consists of a motorized 3-beam optical pick-up unit which moves across the disc, and a spin table connected to a driving motor for disc rotation. The optical pick-up unit produces a laser light spot on the information layer of the disc, through an objective lens which can move up and down thanks to a focus coil. The laser light is diffracted by the disc's pits and the returned beam strikes a photodiode assembly in the optical pick-up unit.

Thus, a CD mechanism is the core of a CD application : it retrieves data from the disc and transfers them to the audio decoder.

It also means that serious knowledge in optical data retrieving is required to manufacture a complete CD player around a bare mechanism. Indeed, the servo-decoding section has to be developed, including hardware and software to control the optical pick-up unit. 

In order to make easier the design phase of the project and reduce time-to-market, it is advised to use complete modules which have already been optimized to provide an excellent playability for high-end audio applications.

The VAM1202 is an audio-dedicated low-cost mechanism : the experience of Philips in optical systems has indeed led to provide a highly efficient mechanism, while reducing the production costs.
Thus, the VAM1202 can be used as the optical core of CD players or listening stations.

The VAM1223 is the top loading version of the famous VAM1202 mechanism.  As the result, the VAM1223 has been designed in order to become the key element of your top loading CD player. Last but not least, the price is also very attractive for this mechanism compared to a complete module.

The VAM1250 mechanism provides excellent optical reading performances, low playback noise and long life expectancy.
It is intended for the high-end audio market, as well as point of sales equipment companies and studio - broadcast laboratories.

Get the DAISy
News Letter