A light source device includes an LD module having a plurality of small light sources such as LDs, a control device selectively controlling OnOff of a plurality of the LDs, a first optical system collecting light emitted from the LDs into one collected light, and a second optical system emitting the collected light directly or through an optical process as source light. Non-fold and fold-area screening patterns are selected. The MCU determines a State of Charge reset point based on the measured battery current and voltage. The techniques of the invention may perform a systematic analysis of the web pages with respect to one or more of their information sharing behavior, their personalization characteristics, and their change pattern over time.