Patent ID: 7075729

Claim:
A zooming lens, suitable for projecting images produced by a display device onto a screen, the zooming lens comprising: a first set of lenses, sequentially comprising a first lens, a second lens, a third lens and a fourth lens, wherein the fourth lens is adjacent to a side of the display device, wherein optical focusing values of the first lens, the second lens, the third lens and the fourth lens are a positive value, a negative value, a negative value and a positive value, respectively; and a second set of lenses, disposed in an optical path between the first set of lenses and the display device, wherein the second set of lenses comprises a fifth lens, a sixth lens, a seventh lens and a composite lens, wherein the composite lens is at one side of the display device, wherein optical focusing values of the fifth lens, the sixth lens, the seventh lens and the composite lens are a positive value, a negative value, a positive value and a positive value, respectively, and the composite lens comprises two lenses.