Patent ID: RE41683

Claim:
An objective compound lens, applied to an optical scanner having at least a light source, a reflection compound mirror and an optical sensor, wherein the light source is used to radiate illuminate a document to obtain an image light, the reflection compound mirror is located in an optical path of the image light to protect the image light on the optical sensor, and the objective compound lens is located between on the optical path of the image light between the optical sensor and the reflection compound mirror, the objective compound lens comprising: a basic objective lens; and a mounting seat; and a plurality of compound lenses, only one of which is suited for connecting and detaching with the mounting seat, a mounting seat configured to releasably couple a compound lens thereto, the mounting seat configured to support and fix the compound lens in alignment with the basic objective lens when the compound lens is releasably coupled thereto, wherein when only one of the compound lenses lens is selected to be allocated on releasably coupled to the mounting seat, the optical scanner has a resolution corresponding to the selected releasably coupled compound lens, and when any one of the compound lenses lens is not connected coupled to the mounting seat, the image light is projected on the optical sensor via the basic object objective lens only.