CN111061040A

CN111061040A - Curved imaging device

Info

Publication number: CN111061040A
Application number: CN201911348130.3A
Authority: CN
Inventors: 王俊; 王勤; 程宏; 刘佳; 金嘉辉
Original assignee: HANGZHOU ZHIDA ELECTRO-OPTICAL CO LTD
Current assignee: HANGZHOU ZHIDA ELECTRO-OPTICAL CO LTD
Priority date: 2019-12-24
Filing date: 2019-12-24
Publication date: 2020-04-24

Abstract

The invention discloses a curved surface imaging device, comprising: the furling lens group comprises at least two negative lenses for collecting light rays with a large field of view into the curved surface imaging device and a positive lens for converging light beams, and the visual angle range of the furling lens group is 150-170 degrees; and the collecting lens group comprises three cemented lenses and at least one positive lens, and is used for collecting the light beams transmitted by the collecting lens group to a final image plane to form a telecentric light path. The invention has the advantages that the lens close to a hemisphere can be obtained, and the imaging performance is better.

Description

Curved surface imaging device

Technical Field

The invention relates to a curved surface imaging device which is mainly applied to the technical field of optical imaging.

Background

The large-view-field imaging technology has more applications in the fields of monitoring, science popularization, display and the like, and the application technologies of the large-view-field imaging currently comprise image splicing, micro-camera array splicing and the like. The image splicing technology is that images shot by a plurality of cameras are spliced by a certain method to form an image with a larger view field. Splicing a plurality of images is mainly characterized in that two or more digital images with overlapped areas are spliced into a panoramic image with a wide view field by adopting an image registration method; the splicing technology of the micro-camera array is to realize large-view-field imaging by utilizing the micro-camera array, and mainly utilizes the axial symmetry of the imaging of the ball lens and combines the micro-camera array and the later-stage calculation imaging technology to realize the imaging result with wide view field and high resolution effect. However, in the prior art, the curved surface imaging technology is not considered to be applied to the large-field imaging, but the characteristics of the curved surface imaging technology are very suitable for the large-field imaging.

Disclosure of Invention

The invention aims to provide a curved surface imaging device which can obtain a lens close to a hemisphere and has better imaging performance.

The invention is realized by the following technical scheme.

A curved surface imaging apparatus comprising:

the furling lens group comprises at least two negative lenses for collecting light rays with a large field of view into the curved surface imaging device and a positive lens for converging light beams, and the visual angle range of the furling lens group is 150-170 degrees;

and the collecting lens group comprises three cemented lenses and at least one positive lens, and is used for collecting the light beams transmitted by the collecting lens group to a final image plane to form a telecentric light path.

Furthermore, three negative lenses of the furling lens group are arranged.

Furthermore, the negative lens of the furling lens group has a focal length of-71.3 to-65.4, -51.8 to-45.7 and-119.5 to-112.1 in sequence according to the sequence of transmitted light beams, a refractive index of 1.62 to 1.97, a refractive index of 1.68 to 1.91 and a refractive index of 1.57 to 1.75, and a dispersion coefficient of 33.25 to 38.46, a refractive index of 45.97 to 52.32 and a dispersion coefficient of 61.25 to 66.41.

Further, the furling lens group is provided with a positive lens, and the positive lens is a lens through which the furling lens group finally transmits light beams.

Furthermore, the focal length of the positive lens is 511.5-523.6, the refractive index is 1.78-1.93, and the dispersion coefficient is 15.6-19.3.

Further, a transition lens group is arranged between the furling lens group and the collecting lens group, and the transition lens group comprises two positive lenses.

Furthermore, the focal lengths of the two positive lens groups of the transition lens group are 223.6-231.6 and 250.3-254.7, the refractive indexes are 1.78-1.85 and 1.79-1.85, and the dispersion coefficients are 41.32-49.51 and 42.15-49.79.

Furthermore, the focal length of the tri-cemented lens is-129.3 to-125.7.

Furthermore, the collecting lens group is provided with two positive lenses, and the two positive lenses are arranged behind the triple cemented lens according to the light beam transmission sequence, the focal lengths of the two positive lenses are 51.2-56.7 and 98.6-105.3, the refractive indexes are 1.56-1.71 and 1.85-1.93, and the dispersion coefficients are 61.3-65.4 and 15.6-19.8.

The invention has the beneficial effects that:

the converging lens group, the transition lens group and the converging lens group converge light rays with a large visual field into the lens as far as possible, and have the function of correcting distortion when converging light beams, thereby further improving the adverse effect of vignetting; the transition mirror group and the collection mirror group converge light rays to a final imaging surface in parallel to form a telecentric light path, so that imaging is clear.

Drawings

FIG. 1 is a schematic structural diagram of a curved surface imaging device in embodiment 1;

FIG. 2 is a schematic diagram of the projection mode of embodiment 3;

fig. 3 is a schematic diagram of the implementation example 3 projection.

Detailed Description

The invention is explained in more detail below with reference to the figures and examples.

Example 1:

referring to fig. 1, a curved surface image forming apparatus includes: a furling lens group, a transition lens group and a collecting lens group.

The furled lens group comprises a negative lens G1, a negative lens G2, a negative lens G3 and a positive lens G4. The negative lens G1 has a focal length of-68.86, a refractive index nd of 1.91, and an Abbe number vd of 35.26. The negative lens G2 has a focal length of-49.97, a refractive index nd of 1.77 and an Abbe number vd of 49.8. The negative lens G3 has a focal length of-115, a refractive index nd of 1.62, and an Abbe number vd of 63.5. The positive lens G4 has a focal length 519, a refractive index nd of 1.92, and an abbe number vd of 18.9.

From left to right, the main function of the negative lens G1 is to collect the light of the large field of view into the inside of the lens as much as possible (design value is 165), and the lens functions of the negative lens G2 and the negative lens G3 are to play a role in collecting and correcting distortion of a part of the negative lens G1 and further improve the adverse effect of vignetting.

The positive lens G4 is used for converging the light rays from G1-G3 and correcting part of phase difference.

The transition lens group comprises a positive lens G5 and a positive lens G6. The positive lens G5 has a focal length 228, a refractive index nd of 1.82, and an abbe number vd of 46.56. The positive lens G6 has a focal length of 252.9, a refractive index nd of 1.82, and an abbe number vd of 46.56.

The positive lens G5 and the positive lens G6 of the transition lens group have a lens effect of canceling a part of aberration caused by the furled lens group, and further furl the light beams transmitted by the furled lens group, so as to flatten the light beams.

The collection lens group comprises a tri-cemented lens G7, a positive lens G8 and a positive lens G9. The focal length of the triplex cemented lens G7 is-128. The positive lens G8 has a focal length of 53.6, a refractive index nd of 1.62, and an abbe number vd of 63.5. The positive lens G9 has a focal length of 101.8, a refractive index nd of 1.9, and an abbe number vd of 18.9.

The lens action of the tri-cemented lens G7, the positive lens G8 and the positive lens G9 is to counteract a part of aberration brought by the front group, and to converge the light rays in parallel to the final imaging surface to form a telecentric optical path, and as the converging lens group has many functions, simple 1-2 lenses cannot completely meet the requirements, so that the three-cemented lens G7 is required to be complicated.

The light rays are converged to the final imaging surface in parallel by the converging lens group to form a telecentric light path. Because the optical path is reversible, when the lens is installed in the projector, the final imaging surface becomes a luminous surface, but the principle of the optical path is not changed.

The outer shell is arranged outside the furling lens group, the transition lens group and the collecting lens group.

The shell is located furling mirror group department and is provided with back group clamping ring 1, back group lens cone 2 and back group space ring 3, back group lens cone 2 is used for installing negative lens G1, negative lens G2, negative lens G3, positive lens G4, back group clamping ring is in order to fix back group lens cone 2 rear end for the protection camera lens, back group space ring 3 is used for separating negative lens G3, positive lens G4 a determining deviation.

The shell is located and is provided with rear group lens section of thick bamboo connecting seat 4 between furling mirror group, the transition mirror group, is located rear group lens section of thick bamboo connecting seat 4's front end is provided with well first lens seat 5 of group, well group second lens seat 6, well first lens seat 5 of group is used for fixing positive lens G5, well group second lens seat 6 is used for fixing positive lens G6, the rear end of well first lens seat 5 of group is fixed with well group clamping ring 7.

The shell is located transition mirror group, collects and is provided with preceding group lens section of thick bamboo connecting seat 8 between the mirror group, is located preceding group lens section of thick bamboo connecting seat 8 with be provided with focusing ring 9, trim ring 10, solid fixed ring 11 between the back group lens section of thick bamboo connecting seat 4, three combinations are used for adjusting the distance between transition mirror group and the collection mirror group to adjust the focus.

The shell is provided with a front group lens barrel 12, a front group first lens seat 13, a front group second lens seat 14, a front group third lens seat 15 and a front group pressing ring 16 at the position of the collecting lens group. The front group barrel 12 is used for mounting the triple cemented lens G7, the positive lens G8 and the positive lens G9. The front group first lens holder 13 is used for fixing the mounted cemented triplet G7 on the front group barrel 12, the front group second lens holder 14 is used for fixing the positive lens G8 on the front group barrel 12, the front group third lens holder 15 is used for fixing the positive lens G9 on the front group barrel 12, and the front group pressing ring 16 is fixed at the front end of the front group barrel 12 to protect the lens.

Example 2:

the projection lens of the projector includes the folding lens group, the transition lens group, and the collecting lens group as described in embodiment 1.

Example 3:

referring to fig. 2, the projector a described in embodiment 2 can project 165 ° every 8.6 °, and the arc length projected on the sphere is uniform, so that the size of the image projected on the sphere by the projector a is uniform.

Referring to fig. 3, two projectors a1, a2 may be used, in combination, to project a complete sphere.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A curved surface imaging device, comprising:

A retractable lens group, including at least two negative lenses for bringing light with a large field of view into the curved imaging device and a positive lens for converging light beams, and the viewing angle range of the retractable lens group is 150°-170°;

The converging mirror group includes a triplet lens and at least one positive lens, and is used for converging the light beams transmitted by the converging mirror group to the final imaging plane, making it a telecentric light path.

2 . The curved imaging device according to claim 1 , wherein there are three negative lenses of the retractable mirror group. 3 .

3 . The curved imaging device according to claim 2 , wherein the focal lengths of the negative lenses of the retracting lens group are -71.3~-65.4, -51.8~-45.7, -71.3~-65.4, -51.8~-45.7, - 119.5~-112.1, the refractive index is 1.62~1.97, 1.68~1.91, 1.57~1.75, and the dispersion coefficient is 33.25~38.46, 45.97~52.32, 61.25~66.41.

4 . The curved imaging device according to claim 1 , wherein the condensing mirror group is provided with a positive lens, and the positive lens is the lens through which the light beam is finally transmitted by the condensing mirror group. 5 .

5 . The curved imaging device according to claim 4 , wherein the focal length of the positive lens is 511.5-523.6, the refractive index is 1.78-1.93, and the dispersion coefficient is 15.6-19.3. 6 .

6 . The curved imaging device according to claim 1 , wherein a transition mirror group is disposed between the retracting mirror group and the converging mirror group, and the transition mirror group includes two positive lenses. 7 .

7 . The curved imaging device according to claim 6 , wherein the two positive lens groups of the transition lens group have focal lengths of 223.6-231.6 and 250.3-254.7, and refractive indices of 1.78-1.85 and 1.79-1.85. 8 . The dispersion coefficients are 41.32~49.51, 42.15~49.79.

8 . The curved imaging device according to claim 1 , wherein the focal length of the triplet lens is between -129.3 and -125.7. 9 .

9 . The curved imaging device according to claim 1 , wherein the collecting mirror group is provided with two positive lenses, and the two positive lenses are arranged after the triplet lens in the order of light beam transmission. 10 . The focal lengths are 51.2~56.7, 98.6~105.3, the refractive indices are 1.56~1.71, 1.85~1.93, and the dispersion coefficients are 61.3~65.4, 15.6~19.8.