CN213240635U

CN213240635U - Variable-focus projection imaging lens

Info

Publication number: CN213240635U
Application number: CN202022243292.5U
Authority: CN
Inventors: 李唯宏; 文兆祺
Original assignee: Heshan Jiamiji Photoelectric Technology Co ltd
Current assignee: Heshan Jiamiji Photoelectric Technology Co ltd
Priority date: 2020-10-10
Filing date: 2020-10-10
Publication date: 2021-05-18
Anticipated expiration: 2030-10-10

Abstract

The utility model discloses a projection imaging lens that can zoom, include the lens cone and locate first lens group that has positive focal power in the lens cone, the mobilizable second lens group that has negative focal power, the mobilizable third lens group that has positive focal power, clamping ring and spacer ring, the clamping ring is used for fixing first lens group, second lens group and third lens group prevent that the camera lens is not hard up, the spacer ring is used for separating two adjacent lenses in the lens that the third lens group contains, the projection imaging lens's that can zoom optical zoom multiple is 10 times. The utility model discloses possess on a large scale and throw the angle change, can realize multi-functional unification for it is better to throw the effect.

Description

Variable-focus projection imaging lens

Technical Field

The utility model relates to a projection lens technical field, concretely relates to projection imaging lens that can zoom.

Background

Along with the continuous development of stage lighting technology, the occasion that stage computer lamp used is more and more extensive, involves indoor outer big small and big type activity, consequently just also more and more high to the requirement of stage lamps and lanterns, will demonstrate the stage effect from the light beam of small angle to the pattern of large angle, just need integrate the element that needs in same platform lamps and lanterns, realize the function unification to be equipped with the effect of multiple static, developments and pattern cutting, just can satisfy the demand of stage polytropy.

The existing stage lighting fixture generally uses high-power LED light as a light source, but is limited to the light-emitting characteristics of the LED light, so that the existing stage lighting fixture does not have a wide projection angle variation range, cannot realize multi-function integration, and leads to unsatisfactory projection effect.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the problem that above-mentioned exists, provide a projection imaging lens that can zoom, possess on a large scale and throw the angle change, can realize multi-functional unification for it is better to throw the effect.

The utility model discloses a realize above-mentioned purpose, take following technical scheme to realize:

a variable-focus projection imaging lens comprises a lens barrel, a first lens group with positive focal power, a movable second lens group with negative focal power, a movable third lens group with positive focal power, a pressing ring and a spacing ring, wherein the first lens group, the movable second lens group, the movable third lens group, the pressing ring and the spacing ring are arranged in the lens barrel, the pressing ring is used for fixing the first lens group, the second lens group and the third lens group and preventing the lens from loosening, the spacing ring is used for separating two adjacent lenses in lenses contained in the third lens group, and the optical zoom multiple of the variable-focus projection imaging lens is 10 times.

Preferably, the first lens group includes a first lens having negative refractive power, a second lens having positive refractive power, and a third lens having positive refractive power, and the first lens, the second lens, and the third lens are all spherical lenses.

Preferably, the second lens group includes a fourth lens having negative power, a fifth lens having negative power, and a sixth lens having positive power, and the fourth lens, the fifth lens, and the sixth lens are all spherical lenses.

Preferably, the third lens group includes a seventh lens having positive power, an eighth lens having negative power, a ninth lens having positive power, a tenth lens having negative power, an eleventh lens having positive power, a twelfth lens having negative power, and a thirteenth lens having positive power, and the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the twelfth lens, and the thirteenth lens are all spherical lenses.

Preferably, the first lens, the sixth lens, the tenth lens and the twelfth lens are all heavy flint glass, the second lens, the third lens and the fifth lens are crown glass, the fourth lens, the eleventh lens and the thirteenth lens are all heavy crown glass, and the seventh lens, the eighth lens and the ninth lens are all lanthanum flint glass.

Preferably, the number of the pressing rings is four, and the four pressing rings are respectively a first pressing ring arranged at the outer side of the first lens and the lens barrel, a second pressing ring arranged at the outer side of the third lens and the lens barrel, a third pressing ring arranged at the outer side of the fourth lens and the lens barrel, and a fourth pressing ring arranged at the outer side of the thirteenth lens and the lens barrel.

Preferably, three spacers are respectively arranged between the eighth lens and the ninth lens, between the ninth lens and the tenth lens, and between the twelfth lens and the thirteenth lens.

Preferably, the projection angle of the variable-focus projection imaging lens is 5-50 degrees.

Preferably, the combined focal length of the first lens group, the second lens group and the third lens group ranges from 25 mm to 250 mm.

Preferably, the back focal length of the variable focus projection imaging lens is greater than 35 mm.

Compared with the prior art, the beneficial effects of the utility model are as follows:

the utility model can change the distance between the two lens groups by directly moving the second lens group and the third lens group, and simultaneously change the distance between the LED light source used by matching with the lens and the lens groups, and change the focal length of the lens, so that the lens of the utility model can realize focusing by moving the position of the lens groups at different projection angles, and project pictures with high definition and high contrast; the lens of the utility model has a 10 times zoom range, can collect light within a divergence angle of 55 degrees, and ensures good light energy utilization rate; the third lens group is moved to keep a longer back focal length, and then a plurality of pattern discs, effect discs, cutting systems and the like can be inserted, so that the function diversification of the lamp is realized, and the stage effect is better.

Drawings

Fig. 1 is a schematic structural diagram of a variable focus projection imaging lens according to the present invention;

fig. 2 is an optical system diagram of a variable focus projection imaging lens according to the present invention.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1 to 2, a variable-focus projection imaging lens includes a lens barrel 10, a first lens group with positive focal power, a movable second lens group with negative focal power, a movable third lens group with positive focal power, a pressing ring and a spacer ring 5, where the first lens group, the second lens group and the third lens group are arranged in the lens barrel 10, the pressing ring is used to fix the first lens group, the second lens group and the third lens group and prevent the lens from loosening, the spacer ring 5 is used to separate two adjacent lenses in the lenses included in the third lens group, and an optical zoom multiple of the variable-focus projection imaging lens is 10 times.

In the embodiment, the lens is applied to a stage lamp and is matched with an LED light source to complete projection imaging of a pattern, wherein the LED light source is high-power LED light, the light divergence is extremely high, and the light utilization rate is high; the second lens group and the third lens group of the embodiment are movable, the distance between the lens groups can be changed by moving the second lens group and the third lens group, meanwhile, the distance between the LED light source and the lens groups can be changed, the focal length is changed accordingly, focusing can be realized at different projection angles, and high-definition and high-contrast pictures can be projected; the lens of the embodiment has a zoom range of 10 times, has a wide projection range, can collect light within a 55-degree emission angle, and ensures good light energy utilization rate; the third lens group is moved to keep a longer back focal length, and can be inserted into a plurality of pattern discs, effect discs, a cutting system and the like, so that diversification of functions of the lamp is realized, and the stage effect is better.

Optionally, the first lens group includes a first lens 11 with negative focal power, a second lens 12 with positive focal power, and a third lens 13 with positive focal power, and the first lens 11, the second lens 12, and the third lens 13 are all spherical lenses.

In this embodiment, the surface S1 of the first lens element is a convex surface, the surface S2 is a concave surface, the surface S3 of the second lens element is a convex surface, the surface S4 of the third lens element is a convex surface, and the surface S5 is a concave surface.

Optionally, the second lens group includes a fourth lens 21 with negative focal power, a fifth lens 22 with negative focal power, and a sixth lens 23 with positive focal power, and the fourth lens 21, the fifth lens 22, and the sixth lens 23 are all spherical lenses.

In this embodiment, the surface S6 of the fourth lens element is a convex surface, the surface S7 is a concave surface, the surfaces S8 and S9 of the fifth lens element are both concave surfaces, the surface S10 of the sixth lens element is a concave surface, and the fifth lens element and the sixth lens element are combined together by a cemented surface, which is beneficial to reducing axial chromatic aberration.

Optionally, the third lens group includes a seventh lens 31 having positive power, an eighth lens 32 having negative power, a ninth lens 33 having positive power, a tenth lens 34 having negative power, an eleventh lens 35 having positive power, a twelfth lens 36 having negative power, and a thirteenth lens 37 having positive power, and the seventh lens 31, the eighth lens 32, the ninth lens 33, the tenth lens 34, the eleventh lens 35, the twelfth lens 36, and the thirteenth lens 37 are all spherical lenses.

In this embodiment, the surface S11 and the surface S12 of the seventh lens are both convex, the surface S13 of the eighth lens is concave, the surface S14 is convex, the surface S15 of the ninth lens is concave, the surface S16 is convex, the surface S17 of the tenth lens is convex, the surface S18 is concave, the surface S19 and the surface S20 of the eleventh lens are both convex, the surface S21 and the surface S22 of the twelfth lens are both convex, and the surface S23 of the thirteenth lens is flat.

Optionally, the first lens 11, the sixth lens 23, the tenth lens 34, and the twelfth lens 36 are all made of heavy flint glass, the second lens 12, the third lens 13, and the fifth lens 22 are made of crown glass, the fourth lens 21, the eleventh lens 35, and the thirteenth lens 37 are made of heavy crown glass, and the seventh lens 31, the eighth lens 32, and the ninth lens 33 are made of lanthanum flint glass.

In the structure, the first lens and the sixth lens are made of heavy flint glass, so that the reduction of vertical axis chromatic aberration is facilitated.

Optionally, there are four press rings, which are a first press ring 41 disposed at the outer side of the first lens 11 and the lens barrel 10, a second press ring 42 disposed at the outer side of the third lens 13 and the lens barrel 10, a third press ring 43 disposed at the outer side of the fourth lens 21 and the lens barrel 10, and a fourth press ring 44 disposed at the outer side of the thirteenth lens 37 and the lens barrel 10.

Alternatively, three spacers 5 are provided between the eighth lens 32 and the ninth lens 33, between the ninth lens 33 and the tenth lens 34, and between the twelfth lens 36 and the thirteenth lens 37, respectively.

Optionally, the projection angle of the variable-focus projection imaging lens is 5-50 degrees.

Optionally, the combined focal length of the first lens group, the second lens group and the third lens group ranges from 25 mm to 250 mm.

Optionally, the back focal length of the variable focus projection imaging lens is greater than 35 mm.

However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention should not be limited thereby, and all the simple equivalent changes and modifications described in the claims and the specification of the present invention are included in the scope of the present invention. In addition, the abstract and the title are provided for assisting the search of patent documents and are not intended to limit the scope of the present invention.

Claims

1. The variable-focus projection imaging lens is characterized by comprising a lens barrel, a first lens group with positive focal power, a movable second lens group with negative focal power, a movable third lens group with positive focal power, a pressing ring and a spacing ring, wherein the first lens group, the second lens group and the third lens group are arranged in the lens barrel, the pressing ring is used for fixing the first lens group, the second lens group and the third lens group and preventing the lenses from loosening, the spacing ring is used for separating two adjacent lenses in the lenses contained in the third lens group, and the optical zoom multiple of the variable-focus projection imaging lens is 10 times.

2. The variable focus projection imaging lens of claim 1, wherein the first lens group comprises a first lens with negative optical power, a second lens with positive optical power, and a third lens with positive optical power, and the first lens, the second lens, and the third lens are all spherical lenses.

3. The variable focus projection imaging lens of claim 2, wherein the second lens group comprises a fourth lens with negative power, a fifth lens with negative power, and a sixth lens with positive power, and the fourth lens, the fifth lens, and the sixth lens are all spherical lenses.

4. The variable focus projection imaging lens of claim 3, wherein the third lens group comprises a seventh lens with positive optical power, an eighth lens with negative optical power, a ninth lens with positive optical power, a tenth lens with negative optical power, an eleventh lens with positive optical power, a twelfth lens with negative optical power, and a thirteenth lens with positive optical power, and the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the twelfth lens, and the thirteenth lens are all spherical lenses.

5. The variable focus projection imaging lens of claim 4, wherein the first, sixth, tenth and twelfth lenses are heavy flint glasses, the second, third and fifth lenses are crown glasses, the fourth, eleventh and thirteenth lenses are heavy crown glasses, and the seventh, eighth and ninth lenses are lanthanum flint glasses.

6. The variable focus projection imaging lens of claim 5, wherein there are four of said pressing rings, which are a first pressing ring disposed at the outer side of the first lens and the lens barrel, a second pressing ring disposed at the outer side of the third lens and the lens barrel, a third pressing ring disposed at the outer side of the fourth lens and the lens barrel, and a fourth pressing ring disposed at the outer side of the thirteenth lens and the lens barrel.

7. The variable focus projection imaging lens of claim 6, wherein there are three spacers, which are respectively disposed between the eighth lens and the ninth lens, between the ninth lens and the tenth lens, and between the twelfth lens and the thirteenth lens.

8. The variable focus projection imaging lens of claim 1, wherein the projection angle of the variable focus projection imaging lens is 5-50 degrees.

9. The variable focus projection imaging lens of claim 1, wherein the combined focal length of said first, second and third lens groups is in the range of 25-250 mm.

10. The variable focus projection imaging lens of claim 1, wherein the back focal length of the variable focus projection imaging lens is greater than 35 mm.