36 Chinese users have formally lodged a lawsuit against Canon, asking it for refunds for their problematic cameras.

Eleven types of Canon cameras sold in China had been reported to have a CCD (charge-coupled device) problem, and Canon had offered free maintenance service for these problematic cameras in late October. However, the users of the PowerShot S1IS Canon camera were still dissatisfied with Canon's free servicing or components change and they want a better solution.

Huang Song, general manager of the Key Client Sales and Service Department of Canon, said that Canon should take a certain responsibility in handling the problematic cameras and needs to further communicate with the customers about a detailed solution.

Founded in 1937, Canon is a world leading imaging and information products company. Its main products include cameras and lenses, digital cameras, printers, copiers, fax machines, scanners and medical instruments.