50results about How to "Few lenses" patented technology

The present invention is directed to an infrared zoom lens that consists merely of optical components of germanium so as to implement an optical system that is capable of reducing variation in brightness during varying a magnification rate and is quite bright and that facilitates compensating for aberration, especially spherical aberration that is generally hard to do, thereby producing a clear and vivid image. The infrared zoom lens comprises first to fourth groups of lens pieces arranged in series from the foremost position closest to the object; each of the lens groups having all the lens pieces made of germanium, and at least one of the lens groups consisting simply of a single lens piece.

The present invention is directed to an infrared zoom lens that consists merely of optical components of germanium so as to implement an optical system that is capable of reducing variation in brightness during varying a magnification rate and is quite bright and that facilitates compensating for aberration, especially spherical aberration that is generally hard to do, thereby producing a clear and vivid image. The infrared zoom lens comprises first to fourth groups of lens pieces arranged in series from the foremost position closest to the object; each of the lens groups having all the lens pieces made of germanium, and at least one of the lens groups consisting simply of a single lens piece.

The invention includes first group of lenses with negative meandering force. second group of lenses with positive meandering force and third group of lenses with positive meandering force successively; at the time of that from wide-angle double to looking far into the distance the interval between first group of lenses and second group of lenses can be reduced, and the interval between second group of lenses and third group of lenses can be widened. Said invention is characterized by that said first group of lenses contains negative meniscus lens whose convex surface is faced with side of body and positive meniscus lens whose convex surface is faced with side of body, said second group of lenses contains positive meanderingly-bonded lens and negative meniscus lens whose convex surface is faced with body which are arranged successively form objective side direction, and the third group of lenses is a double-convex lens.

The embodiment of the invention discloses an ultra-wide-angle optical system. From an object surface to an image surface along an optical axis, the ultra-wide-angle optical system successively at least comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens, wherein the focal power of the first lens is negative, the focal power of the second lens is negative, the focal power of the third lens is negative, the focal power of the fourth lens is positive, the focal power of the fifth lens is positive, the focal power of the sixth lens is negative, the focal power of the seventh lens is positive, the focal power of the eighth lens is negative, and the focal power of the ninth lens is positive. The embodiment of the invention further provides a lens unit. The optical system or the lens unit is formed by 9 lenses, the number of the lenses is small, and the structure is simple; in addition, the different lenses are combined and reasonably distribute the focal power, so that the good performance such as a large aperture, a larger view angle and high definition is realized.

The invention relates to an axial-zooming tri-view-field long-wave infrared imaging optical system. The system comprises an objective lens, a zooming lens, a compensating lens, a focusing lens and a converging lens set which are sequentially arranged in the same optical axis from the object space to the image space, and the surface, close to the image space, of the compensating lens adopts a diffraction surface; design index parameters of the optical system are as followed: working waveband ranges from 7700 nm to 9500 nm, the focal distance of the system in a large view field is 22 mm, the focal distance of the system in a middle view field is 92 mm, and the focal distance of the system in a small view field is 550 mm; the working environment temperature ranges from minus 40 DEG C to 60 DEG C. According to the axial-zooming tri-view-field long-wave infrared imaging optical system, switching among the three view fields is achieved by axially moving the zooming lens and the focusing lens, and the zooming ratio can reach 25 times; in addition, by axially regulating the position of the focusing lens, focal point drifting on the image surface due to the temperature changes can be compensated, it is guaranteed that the image quality is not changed along with the temperature, and therefore the high-low temperature environmental suitability of the optical system is good.

The embodiment of the invention discloses a high-pixel camera shooting optical system. The high-pixel camera shooting optical system at least comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in sequence from an object surface to an image surface along the optical axis. The optical system meets the following conditions: (1) f / f1 is more than -0.25 and less than -0.1; (2) f / f5 is more than 0 and less than 0.3; (3) f / fI is more than 0.25 and less than 0.45; (4) f / fII is more than 0.05 and less than 0.6. On the other hand, the embodiment of the invention further provides a camera lens. According to the embodiment of the invention, the seven lenses are used in total and the quantity of the lenses is few, so that the structure is simple; furthermore, with the adoption of optical conditions met by the optical system or the camera lens, the optical system or the camera lens has the good properties of ultra-wide angle, large aperture, low chromatic aberration, high imaging pixel and the like.