Abstract: An optical imaging system includes a first lens having a convex image-side surface, a second lens having a concave object-side surface, a third lens, a fourth lens, and a fifth lens disposed sequentially from an object side. The optical imaging system satisfies 4.8<f/IMG_HT<9.0, where f is a focal length of the optical imaging system, and IMG_HT is half a diagonal length of an imaging surface of an image sensor.

Abstract: An optical imaging system includes a first lens having a convex image-side surface, a second lens having a concave object-side surface, a third lens, a fourth lens, and a fifth lens disposed sequentially from an object side. The optical imaging system satisfies 4.8<f/IMG_HT<9.0, where f is a focal length of the optical imaging system, and IMG_HT is half a diagonal length of an imaging surface of an image sensor.

Abstract: A method of providing data communication services between an external electronic device such as a personal computer which is connected to a communication device such as a mobile phone, comprising the steps of: periodically checking a connection state to generate connection state data, storing said connection state data in a memory, and determining whether to provide said data communication services according to said stored connection state data. A device for performing the method is also disclosed.

Abstract: There is disclosed a self multi-copy method in a facsimile system capable of making at least one copy of the contents of each inserted document. The inventive method comprises: displaying a first message to have the desired amount of the pages set; displaying a second message to have the document loaded; conveying the document into a scanning position; detecting whether another document is inserted or not; repeating the execution from the step of conveying the document into scanning position when another document is detected at the previous step; outputting the amount of one page of the coded data from the memory; decreasing the stored contents in a register; an eight step for decreasing the set value of the copy number by one; and clearing the data in the memory and moving to a stand-by mode.