High-throughput centrifugation of batches of samples is achieved by dividing a single centrifugation run of a batch of samples into two or more staggered, discrete spins with fewer samples and in which the availability of centrifuge slots for loading or unloading of samples and the subsequent delivery of experimental results can be enhanced. The driver circuit includes a source of incoming AC power, a rectifier, and a constant voltage driver. With such a configuration, a lens driving control method is changed by AF control of a phase difference detection system and AF control of a hill climbing system, and a driving system suitable for each AF system is performed, whereby the focusing operation can be performed normally at a high speed. The invention also concerns a biosourced 1,3-propanediol obtained by the process thereof.