5 mm built in objective

Despite the fact that convergence, without exaggeration, goes by seven-mile steps and already appeared the first cell phones with the built-in 10 mega-pixel camera, the creation of the thin objectives, which possess at the same time high candlepower and capable of changing focal length, it remains one of the main problems. Recently we already reported about the first camera with the liquid objective, and in todays release of the periodical applied optics was published the product, dedicated to the technology of creation of thin objectives with the focal length, seven times larger than its thickness. Contributors of â€“ the Eric tremblay and Joseph Ford from the university of state California in San- Diego. Thin objective is intended for the integration in to the palmtops and cell phones.

, In order to ensure the large focal length (telescopic regime survey), the optical system, built according to the principle of the multiple internal reflection (see figure) is used. By the key element of optical system is the crystal of fluoride calcium the thickness of 5 mm, on which diamond tool substituted the concentric circles, which reflect and which focus the light, which falls into the outward flange 60- mm of objective. As is asserted, this optical system is equivalent to the usual objective with a length of 38 mm and by the minimum distance of focusing 2,5 m.

However, in the new type of objectives is a deficiency â€“ the limited depth of focusing, for compensating which is used the fairly complicated algorithm

At present researchers work at the analogous optical system, which makes possible to change focal length. In it multiple reflection will be also used, but air will already be present between the reflecting mirrors instead of crystal fluoride calcium.

5 mm built in objective

5 MM BUILT IN OBJECTIVE