The invention relates to an optical lens system which is suitable for use in an optical scanning device for reading andor writing an optically scannable record carrier. With the main molding carried out after the preform molding, it is possible to manufacture sound-proof products of excellent quality. The power of the second heating device is defined so low that no temperature limiter for protecting a glass ceramic plate has to be provided in the control path of the second heating device. Preferably, the data returned in response to the first-type query command identifies the at least one related item.