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).

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 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.