Large zoom ratio continuous zooming projection lens

A technology with a large zoom ratio and lens, applied in optical components, optics, instruments, etc., can solve the problems of strict processing and assembly requirements, low processing efficiency and yield, unfavorable production efficiency, etc., to achieve low product cost and improve product quality. Yield and production efficiency, avoid the effect of moving the lift angle too large

Active Publication Date: 2014-03-12
NANYANG LIDA PHOTOELECTRIC
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  • Abstract
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Problems solved by technology

In the existing disclosed continuous zoom projection lens technology, part of the application of aspheric technology, that is, by adding an aspheric lens to the optical system of the zoom projection lens to improve the imaging quality of the system or simplify the system structure, but the application of the aspheric lens Strict requirements on its processing and assembly are not conducive to the improvement of production efficiency and the reduction of cost; and in the technology that does not use aspheric lenses, in order to achieve better optical performance, the technical measures are generally to increase the number of lenses, or Using high-grade optical materials with high refractive index or high dispersion coefficient, such as FCD1, which has significantly improved aberratio

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  • Large zoom ratio continuous zooming projection lens
  • Large zoom ratio continuous zooming projection lens
  • Large zoom ratio continuous zooming projection lens

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Embodiment Construction

[0039] Such as figure 1 The large zoom ratio continuous zoom projection lens shown has 12 optical lenses, which are biconvex first positive lens L1, positive meniscus first negative lens L2, and biconcave first negative lens L1 from the screen side to the image plane side. Composed of two negative lenses L3, the second positive lens L4 of negative meniscus, the third positive lens L5 of positive meniscus, the fourth positive lens L6 of biconvex, the third negative lens L7 of negative meniscus, the fourth lens of double concave A negative lens L8, a biconvex fifth negative lens L9, a biconvex fifth positive lens L10, a biconvex sixth positive lens L11, and a biconvex seventh positive lens L12. Among them, the first positive lens L1, the first negative lens L2, and the second negative lens L3 form a focusing group U1, and its combined focal length is negative; the second positive lens L4 and the third positive lens L5 form a variable power group U2, which The total focal length...

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Abstract

The invention relates to a large zoom ratio continuous zooming projection lens. Optical system lenses comprise a focusing unit, a zoom unit, a first compensation unit, a second compensation unit, and a rear fixing unit. The units are arranged from a screen side to an image plane side along an optical axis. A diaphragm is disposed on the second compensation unit. Focusing is realized by back and forth movement of the focusing unit, and zooming is realized by moving the zoom unit, the first compensation unit and the second compensation unit in the same direction from the wide angle end to the telephotograph end along the optical axis, wherein in the zooming process, projection images are kept clear, the total distance from the first surface of the lens to the image plane is fixed, and all the lenses are made of glass which is frequently used in domestic, and are spherical lenses. The large zoom ratio continuous zooming projection lens is low in the cost and good in technology, is suitable for batch production, and can be widely applied to the field of mini projection.

Description

technical field [0001] The invention belongs to the technical field of digital projectors, and is a large zoom ratio continuous zoom projection lens used in conjunction with a telecentric lighting optical path, which is applied to a digital projector with an LED light source. Background technique [0002] With the development and deepening of semiconductor technology, LED light source digital projection display technology has been developed in the spring, and the projection display industry based on LED and light source technologies such as DLP, LCOS, and LCD has developed rapidly. In recent years, LED light source projection display technology has developed rapidly with its rich colors, high-definition pictures, high-brightness images and high-contrast displays. It can achieve product characteristics of smaller size, lighter weight and long life , especially in the field of micro-projection projection technology, its advantages are unparalleled. [0003] The prominent prob...

Claims

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Application Information

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IPC IPC(8): G02B15/177
Inventor 赵武李智超何春生陈胜利赵伦
Owner NANYANG LIDA PHOTOELECTRIC
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