34results about How to "High telecentricity" patented technology

It is to provide an imaging lens that maintains optical performance and achieves reduction in size and weight. The imaging lens comprises, in order from an object side towards an image surface side, a first lens which is a meniscus lens having a positive power whose convex surface faces the object side, a diaphragm, a second lens which is a meniscus lens having a positive power whose convex surface faces the image surface side, and a third lens which is a biconcave lens having a negative power, wherein the following conditions are to be satisfied; 1.3≧L / fl≧1, 0.8≧f1 / fl≧0.6, 0.12≧f1 / f2>0, −0.1≧f1 / f3≧−0.25 (where, L: entire length of the lens system [distance from the surface of the object side of the first lens to the image taking surface [air reduced length]], fl: focal distance of the entire lens system, f1: focal distance of the first lens, f2: focal distance of the second lens, and f3: focal distance of the third lens).

An imaging lens consists of a negative first lens having a concave object-side surface, a positive second lens, a negative third lens, a positive fourth lens having a convex object-side surface, and a positive fifth lens, which are in this order from an object side. A stop is arranged between an image-side surface of the first lens and an object-side surface of the third lens. When the focal length of an entire system is f, and the focal length of the first lens is f1, and the focal length of the second lens is f2, the following formula is satisfied:−1.30<f1 / f2>−0.65  (7).

The invention discloses a double-telecentric fixed-focus lens, which is sequentially provided with a first single positive spherical lens, a second single positive spherical lens, a third single negative spherical lens, a fourth single negative spherical lens, The fifth single negative spherical lens, the sixth single positive spherical lens and the seventh single positive spherical lens; the second single positive spherical lens and the third single negative spherical lens are combined into cemented lenses; the fifth single negative spherical lens and the sixth single The combination of positive spherical lenses is cemented lenses; a diaphragm is arranged between the third single negative spherical lens and the fourth single negative spherical lens. The bi-telecentric fixed-focus lens of the present invention reduces the number of lenses, making the production cost lower; on the premise of less lenses, the structure is simpler, smaller in size, and lighter in weight. At the same time, the bi-telecentric fixed-focus lens also has The lens has the characteristics of small total length, large F value, and large maximum imaging surface.

A compact zoom lens with three lens groups and a design method thereof. Along the optical axis from the object side to the image side, the compact zoom lens with three lens groups includes a negative power first lens group having a negative power first lens and a positive power second lens, a positive power second lens group having a positive power third lens, a negative power fourth lens leaned with the third lens and a positive power fifth lens, and a third lens group having a positive power sixth lens. The zoom lens matches requirements of optical properties for aberration correction. Minimum change of the distance between the first lens of the first lens group and the image forming plane from the WIDE position to the TELE position is used as the objective function of optimization.

The invention relates to a wide-angle zoom lens system easy to ensure telecentricity particularly suited for digital single-lens reflex cameras. The wide-angle zoom lens system comprises a first group G1 of negative power, a second group G2 of positive power and a third group G3 of positive power. Upon zooming from a wide-angle end to a telephoto end, at least the first group G1 and the second group G2 move such that a spacing between the first group G1 and the second group G2 becomes narrow and a spacing between the second group G2 and the third group G3 becomes wide. The first group G1 comprises, in order from its object side, a first lens subgroup SG1a of negative refracting power and a second lens subgroup SG1b of negative refracting power. Upon focusing from a far object point to a near object point, the first lens subgroup SG1a and the second lens subgroup SG1b move toward the object side with a narrowing spacing between them.

It is to provide an imaging lens system which, while reduced in size and weight, can fully meet the demand for more improvement in the optical performance and also improvement in the productivity. The imaging lens system comprises, in order from an object side towards an image surface side, a diaphragm, a first lens which is a meniscus lens having a positive power whose concave surface facing the object side, and a second lens which is a meniscus lens having a negative power whose convex surface facing the image surface side, wherein the Abbe number of the second lens is set smaller than the Abbe number of the first lens.

A light modulation device side lens group has different powers in the longitudinal direction and the lateral direction of a liquid crystal panel. Therefore, as the entire system of the optical projection system, the light modulation device side lens group has different magnification in the longitudinal and lateral directions. Therefore, it is possible to make the aspect ratio of an image of the liquid crystal panel different from the aspect ratio of an image projected on a screen. That is, conversion can be performed on an aspect ratio. At this time, a distance p between each focus or a diaphragm and the screen SC side end surface of the light modulation device side lens group satisfies the conditional expressions, so it is possible to achieve a predetermined or higher telecentricity in both states, that is, a first operating state and a second operating state.

The invention provides an immersed ultraviolet optical system, which is used for forming an image of an object plane into an image plane. The immersed ultraviolet optical system comprises a first unit, a second unit, a third unit, a fourth unit and a fifth unit in the direction of an optical axis of the system. The first unit group L1 with positive refractive power, the second unit group L2 with positive refractive power, the third unit group L3 with positive refractive power, the fourth unit group L4 with negative refractive power and the fifth unit group L5 with negative refractive power are orderly arranged in the incidence direction of light beams. The immersed ultraviolet optical system provided by the invention can compensate aberration better, improve imaging quality, promote system resolution and improve photoetching efficiency.

The invention discloses a double-optical-path double-telecentric optical system. The optical system comprises a projection system and an imaging system; the imaging system is sequentially provided with a common-optical-path objective lens set, a beam splitter prism, a diaphragm I and an imaging objective lens set from an object surface to an image surface; the projection system comprises a lighting system, a projection objective lens set, a diaphragm II, a beam splitter prism and a common-optical-path objective lens set from a lighting system to the object surface; the projection system projects modulated stripe light generated by the lighting system onto the object surface; and the imaging system is used for imaging stripe light information reflected by the object surface on the image surface. The optical system is high in integration level, high in precision, high in resolution, high in telecentricity and small in distortion, can effectively improve the imaging quality, and can be applied to the field of high-precision detection of optical lenses; and in addition, materials used by the lenses are relatively high in repetition rate, so that the processing is facilitated, and the cost is reduced.

The invention discloses a double-telecentricity fixed-focus lens. A first single positive spherical lens, a second single positive spherical lens, a third single negative spherical lens, a fourth single negative spherical lens, a fifth single negative spherical lens, a sixth single positive spherical lens and a seventh single positive spherical lens are successively arranged from an end of a tested object; the second single positive spherical lens and the third single negative spherical lens are combined into a bonding lens; the fifth single negative spherical lens and the sixth single positive spherical lens are combined into a bonding lens; and a diaphragm is positioned between the third single negative spherical lens and the fourth single negative spherical lens. The double-telecentricity fixed-focus lens reduces quantity of the lenses, lowers the manufacture cost, and enables the structure to be simple, smaller in volume and lighter in weight on the premise that the lenses are few, Meanwhile, the double-telecentricity fixed-focus lens is small in total length of the lens, big in an F value and big in a maximum imaging surface.