CN-122018125-A - Zoom projection lens and imaging device

CN122018125ACN 122018125 ACN122018125 ACN 122018125ACN-122018125-A

Abstract

The invention relates to the field of optics, in particular to a zoom projection lens and an imaging device, which sequentially comprise a focusing lens group with negative focal power, a first fixed lens group with negative focal power, a first zoom lens group with negative focal power, a second zoom lens group with positive focal power, a third zoom lens group with positive focal power, a fourth zoom lens group and a second fixed lens group with positive focal power from an object plane side to an image plane side, wherein the zoom projection lens meets the following conditions that fno <1.7, ft/fw <2, wherein fno is the f-number of the zoom projection lens, ft is the focal length of the zoom projection lens in a telescopic state, and fw is the focal length of the zoom projection lens in a wide-angle state. The brightness of the zoom projection lens is greatly increased, the use of a user is facilitated, meanwhile, the resolution of the zoom projection lens is greatly increased through the use of a large number of zoom lens groups, and the imaging quality of the zoom projection lens is improved.

Inventors

YUAN HAOSHENG
CHEN SANZHONG
Zhao Yayue
ZHANG SISHEN

Assignees

嘉兴中润光学科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260325

Claims (12)

1. The zoom projection lens is characterized by comprising a focusing lens group with negative focal power, a first fixed lens group with negative focal power, a first variable lens group with negative focal power, a second variable lens group with positive focal power, a third variable lens group with positive focal power, a fourth variable lens group with positive focal power and a second fixed lens group with positive focal power in sequence from an object plane side to an image plane side; The first zoom lens group, the second zoom lens group, the third zoom lens group and the fourth zoom lens group move along the main optical axis direction of the zoom projection lens; The focusing lens group sequentially comprises a first focusing lens with negative focal power and a second focusing lens with negative focal power from the object plane side to the image plane side; the first fixed lens group is a first fixed lens with negative focal power; The second fixed lens group is a second fixed lens with positive focal power; the zoom projection lens satisfies the following conditional expression: fno<1.7; ft/fw<2; wherein fno is the f-number of the zoom projection lens, ft is the focal length of the zoom projection lens in the telescopic state, and fw is the focal length of the zoom projection lens in the wide-angle state.
2. The zoom projection lens of claim 1, wherein: The first zoom lens group consists of a first zoom lens with negative focal power and a second zoom lens with positive focal power in sequence from the object plane side to the image plane side; the second zoom lens group sequentially comprises a third zoom lens with positive focal power and a fourth zoom lens with negative focal power from the object plane side to the image plane side, and the third zoom lens and the fourth zoom lens are glued; the third variable magnification lens group is a fifth variable magnification lens with positive focal power.
3. The zoom projection lens of claim 1, wherein: the first variable magnification lens group to the fourth variable magnification lens group at least comprise one aspheric lens.
4. The zoom projection lens of claim 1, wherein: The fourth zoom lens group is composed of a sixth zoom lens with negative focal power, a seventh zoom lens with positive focal power, an eighth zoom lens with negative focal power, a ninth zoom lens with positive focal power, a tenth zoom lens with negative focal power and an eleventh zoom lens with positive focal power in sequence from an object plane side to an image plane side, and the eighth zoom lens, the ninth zoom lens and the tenth zoom lens form a three-cemented lens together.
5. The zoom projection lens of claim 1, wherein: The fourth zoom lens group comprises a seventh zoom lens with positive focal power, an eighth zoom lens with negative focal power, a ninth zoom lens with positive focal power, a tenth zoom lens with negative focal power, an eleventh zoom lens with positive focal power and a twelfth zoom lens with positive focal power in sequence from the object plane side to the image plane side, and the eighth zoom lens, the ninth zoom lens and the tenth zoom lens form a three-cemented lens together.
6. The zoom projection lens of claim 4 wherein: the zoom projection lens satisfies the following conditional expression: fG5/fw<10; fG6/fw<-1000; Wherein fG5 is the focal length of the third variable magnification lens group, and fG6 is the focal length of the fourth variable magnification lens group.
7. The zoom projection lens of claim 5 wherein: the zoom projection lens satisfies the following conditional expression: fG5/fw>124; fG6/fw<10; Wherein fG5 is the focal length of the third variable magnification lens group, and fG6 is the focal length of the fourth variable magnification lens group.
8. The zoom projection lens of claim 1, wherein: the moving directions of the first variable magnification lens group to the fourth variable magnification lens group are the same.
9. The zoom projection lens of claim 1, wherein: the zoom projection lens satisfies the following conditional expression: 1<XG4/fw<2; wherein XG4 is the maximum movement distance of the second variable magnification lens group, and XG5 is the maximum movement distance of the third variable magnification lens group.
10. The zoom projection lens of claim 1, wherein: the zoom projection lens satisfies the following conditional expression: XG3/XG4<0.3; XG6/XG4<0.7; Wherein XG3 is the maximum movement distance of the first variable magnification lens group, and XG6 is the maximum movement distance of the fourth variable magnification lens group.
11. The zoom projection lens of claim 1, wherein: The first focusing lens is an aspheric lens; the zoom projection lens satisfies the following conditional expression: Φa1/Φb1>1.8; Wherein Φa1 is the outer diameter of the first focusing lens, Φb1 is the outer diameter of the first fixed lens.
12. An image forming apparatus, comprising: The zoom projection lens according to any one of claims 1 to 11; and an imaging element configured to receive an image formed by the zoom projection lens.

Description

Zoom projection lens and imaging device Technical Field The invention relates to the field of optics, in particular to a zoom projection lens and an imaging device. Background Projection lenses, also called projector lenses, are core optical components of projectors, which are classified into special types such as short-focus, medium-focus, long-focus, reflection-type and fish-eyes according to projection distances, and are widely used in the fields of education, engineering, household use and the like. The core parameter transmittance is the ratio of the projection distance to the picture width, the projection ratio of the short-focus lens is smaller than 1, the ultra-short focus can reach 0.25, and a large picture can be projected in a short distance. Currently, existing projection lenses are generally suitable for meeting scenes, and have no problem for some conventional projections, but for some projection of precise images, the resolution of the general projection lens is difficult to meet the requirements. Disclosure of Invention The invention solves the prior technical problems, provides the zoom projection lens and the imaging device, greatly increases the brightness of the zoom projection lens on the basis of realizing projection, is convenient for users to use, and simultaneously greatly increases the resolution of the zoom projection lens and the imaging quality of the zoom projection lens through the use of a continuous large number of zoom lens groups. The technical scheme provided by the invention is as follows: The zoom projection lens sequentially comprises a focusing lens group with negative focal power, a first fixed lens group with negative focal power, a first zoom lens group with negative focal power, a second zoom lens group with positive focal power, a third zoom lens group with positive focal power, a fourth zoom lens group and a second fixed lens group with positive focal power from an object plane side to an image plane side; The first zoom lens group, the second zoom lens group, the third zoom lens group and the fourth zoom lens group move along the main optical axis direction of the zoom projection lens; The focusing lens group sequentially comprises a first focusing lens with negative focal power and a second focusing lens with negative focal power from the object plane side to the image plane side; the first fixed lens group is a first fixed lens with negative focal power; The second fixed lens group is a second fixed lens with positive focal power; the zoom projection lens satisfies the following conditional expression: fno<1.7; ft/fw<2; wherein fno is the f-number of the zoom projection lens, ft is the focal length of the zoom projection lens in the telescopic state, and fw is the focal length of the zoom projection lens in the wide-angle state. Through the definition of above-mentioned structure and parameter, on the basis of realizing the projection, very big increase the luminance of zoom projection lens, the use of user of being convenient for, through the use of continuous a large amount of zoom lens group simultaneously, very big increase the resolution of zoom projection lens, increased the imaging quality of zoom projection lens. Further, the first variable magnification lens group is composed of a first variable magnification lens with negative focal power and a second variable magnification lens with positive focal power in sequence from the object plane side to the image plane side; the second zoom lens group sequentially comprises a third zoom lens with positive focal power and a fourth zoom lens with negative focal power from the object plane side to the image plane side, and the third zoom lens and the fourth zoom lens are glued; the third variable magnification lens group is a fifth variable magnification lens with positive focal power. Further, the first to fourth variable magnification lens groups include at least one aspheric lens. In the technical scheme, through the use of the aspheric lens, the number of lenses in the zoom projection lens is reduced, and the size of the zoom projection lens is further reduced. Further, the fourth zoom lens group is composed of a sixth zoom lens with negative focal power, a seventh zoom lens with positive focal power, an eighth zoom lens with negative focal power, a ninth zoom lens with positive focal power, a tenth zoom lens with negative focal power, an eleventh zoom lens with positive focal power in sequence from the object plane side to the image plane side, and the eighth zoom lens, the ninth zoom lens and the tenth zoom lens form a three-cemented lens together. Further, the fourth variable magnification lens group is composed of a seventh variable magnification lens with positive focal power, an eighth variable magnification lens with negative focal power, a ninth variable magnification lens with positive focal power, a tenth variable magnification lens with negative focal power, an eleventh variable magnification le