CN216814049U

CN216814049U - Cutting imaging lamp camera lens

Info

Publication number: CN216814049U
Application number: CN202122384777.0U
Authority: CN
Inventors: 梁湛阳
Original assignee: Heshan Jiamiji Photoelectric Technology Co ltd
Current assignee: Heshan Jiamiji Photoelectric Technology Co ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2022-06-24
Anticipated expiration: 2031-09-30

Abstract

The utility model discloses a cutting imaging lamp lens, which comprises a lens group with positive focal power, wherein the lens group with positive focal power comprises a first lens group with positive focal power, a second lens group with negative focal power and a third lens group with positive focal power; the first lens is a spherical lens, the second lens group with negative focal power comprises a second lens with positive focal power and a third lens with negative focal power, and the third lens group with positive focal power comprises a fourth lens with positive focal power; the fourth lens is a spherical lens, the imaging result of two lenses is abandoned, and the imaging result is replaced by the result of a multi-lens group, so that the problems of unclear imaging, insufficiently sharp edge cutting and easy deformation are solved.

Description

Cutting imaging lamp camera lens

Technical Field

The utility model relates to the technical field of projection lenses, in particular to a cutting imaging lamp lens.

Background

The imaging lamp is also called a forming lamp, a condensing lens is used for condensing light beams, the light beam angles are various, light spots formed by imaging the light beams can be cut into various shapes such as a square shape, a diamond shape, a triangle shape, a trapezoid shape and the like through a cutting sheet, or various needed patterns or decorative patterns are projected to create various different effect scenes and atmospheres, so the imaging lamp is widely applied to occasions such as stage performance scenery, photo studios, studios and the like.

The imaging lamp is provided with an imaging light hole and a cutting piece, and the cutting piece extends into the imaging light hole to block part of emergent light so as to project other specific light spot patterns or decorative patterns.

The existing imaging lamp in the market mainly takes 200W and 300W as main parts, and the imaging lamp lens is composed of 2 spherical lenses, but because 2 spherical lenses are all convex lenses, the spherical aberration cannot be corrected, the chromatic aberration is often unclear in imaging, the blue edge of the edge is large, the edge is not sharp, the edge is not deformed, and the edge has obvious virtual light. Although some imaging lamp lenses are composed of aspheric lenses, the imaging is improved, and the edge cutting is improved, the imaging is still not clear enough, and the blue edge still exists.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the defects in the prior art and provides a lens for a cutting imaging lamp.

In order to achieve the purpose, the utility model adopts the following technical scheme: a cut imaging lamp lens includes lens groups having positive power, wherein the lens groups having positive power include a first lens group having positive power, a second lens group having negative power, and a third lens group having positive power.

Preferably, the first lens group having positive optical power includes a first lens having positive optical power; the first lens is a spherical lens;

preferably, the object-side surface of the first lens element is convex, and the image-side surface of the first lens element is concave. Preferably, the second lens group having negative power includes a second lens having positive power and a third lens having negative power.

Preferably, the second lens and the third lens of the second lens group having negative power are both spherical lenses.

Preferably, the object-side surface of the second lens element of the second lens group having negative refractive power is a convex surface, the image-side surface of the second lens element is a concave surface, the object-side surface of the third lens element is a flat surface, and the image-side surface of the third lens element is a concave surface.

Preferably, the third lens group having positive optical power includes a fourth lens having positive optical power; the fourth lens is a spherical lens;

preferably, an object-side surface of the fourth lens element is convex, and an image-side surface of the fourth lens element is planar.

Preferably, the light-emitting aperture of the lens group is less than 120mm, and the total optical length is less than 200 mm.

Preferably, the rear intercept of the lens group is >60mm and the projection angle is between 24 and 28 degrees.

The utility model has the following beneficial effects:

the utility model abandons the imaging result of two lenses and replaces the imaging result with the result of a multi-lens group, solves the problems of unclear imaging, insufficiently sharp edge cutting and easy deformation, and has the advantages of clear imaging, small edge chromatic aberration, basically no blue edge, straight edge cutting, no obvious deformation and no virtual light.

Drawings

Illustration of the drawings: the lens barrel 1, a first lens group G1, a first lens L1, a second lens group G2, a second lens L2, a third lens L3, a third lens group G3 and a fourth lens L4.

Fig. 1 is a structural view of a lens group.

FIG. 2 is a diagram of the vertical axis aberration of the optical system;

FIG. 3 is a graph of field curvature and distortion aberration of an optical system;

FIG. 4 is a spherical aberration diagram of an optical system;

FIG. 5 shows the values of the surface curvature radius, the pitch, the d-light refractive index and the d-light Abbe number of each lens provided by the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

Referring to fig. 1-5, one embodiment of the present invention is provided: a cut imaging lamp lens comprises a lens group with positive focal power and a pressing ring, wherein the lens group with positive focal power comprises a first lens group G1 with positive focal power, a second lens group G2 with negative focal power and a third lens group G3 with positive focal power, and the first lens group G1, the second lens group G2 and the third lens group G3 are sequentially arranged.

In the present embodiment, it is preferable that the first lens group G1 having positive power includes a first lens L1 having positive power; the object-side surface S1 of the first lens element L1 is a convex surface, and the image-side surface S2 is a concave spherical lens; the material is crown glass; distortion can be effectively controlled.

In the present embodiment, it is preferable that the second lens group G2 having negative power includes a second lens L2 having positive power and a third lens L3 having negative power; the second lens L2 and the third lens L3 are both spherical lenses; the object-side surface S3 of the second lens element L2 is convex, the image-side surface S4 is concave, the object-side surface S5 of the third lens element L3 is planar, and the image-side surface S6 is concave; wherein the second lens L2 is heavy crown glass and the third lens L3 is heavy flint glass; the added flint concave lens can effectively reduce chromatic aberration and coma of spherical aberration, wherein a pressing ring is arranged at the outer side of the second lens L2 and the lens cone 1 and used for fixing the lens group and preventing the lens group from moving;

in the present embodiment, it is preferable that the third lens group G3 having positive optical power includes a fourth lens L4 having positive optical power; the fourth lens L4 is a spherical lens; the object-side surface S7 is convex, and the image-side surface S8 is planar; the material is heavy flint glass; the added heavy flint lens can effectively reduce chromatic aberration, and in the embodiment, the projection angle of the lens group is preferably 26 degrees;

in this embodiment, preferably, the light-emitting aperture of the lens group is smaller than 120mm, and the light-emitting aperture of 120mm can ensure that the brightness is not too low and the cost is not too high

In the present embodiment, the optical total length is preferably less than 200 mm; the lamp body can be shorter and shorter, and the cost is lower;

in this embodiment, it is preferable that the rear intercept of the lens group is >60mm to ensure sufficient space for designing the casing and for placing the cutter and the moving position of the lens group

Referring to fig. 5, fig. 5 shows the radius of curvature, the pitch, the refractive index of d light, and the abbe number of d light of each lens included in the projection lens of the present embodiment, where the pitch corresponding to each surface refers to the distance from the surface to the next surface, for example, the pitch corresponding to S1 refers to the distance from the center of S1 to the center of S2, i.e., the center thickness of the first lens, the pitch corresponding to S2 refers to the distance from the center of S2 to the center of S3, i.e., the thickness of air between the first lens and the second lens L2, and the unit of the radius of curvature and the pitch is millimeters (mm).

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the utility model.

Claims

1. A cutting imaging lamp lens which characterized in that: includes a lens group having positive power, the lens group having positive power including a first lens group having positive power, a second lens group having negative power, and a third lens group having positive power.

2. The lens of the cutting imaging lamp of claim 1, wherein: the first lens group having positive optical power includes a first lens having positive optical power; the first lens is a spherical lens.

3. The lens of a cutting imaging lamp as claimed in claim 2, wherein: the first lens element has a convex object-side surface and a concave image-side surface.

4. The lens of a cutting imaging lamp as claimed in claim 1, wherein: the second lens group having negative power includes a second lens having positive power and a third lens having negative power.

5. The lens of the cutting imaging lamp as claimed in claim 4, wherein: the second lens and the third lens are both spherical lenses.

6. The lens of the cutting imaging lamp as claimed in claim 5, wherein: the second lens element has a convex object-side surface and a concave image-side surface, and the third lens element has a planar object-side surface and a concave image-side surface.

7. The lens of a cutting imaging lamp as claimed in claim 1, wherein: the third lens group having positive optical power includes a fourth lens having positive optical power; the fourth lens is a spherical lens.

8. The lens of claim 7, wherein: the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a plane.

9. The lens of a cutting imaging lamp as claimed in claim 1, wherein: the light-emitting aperture of the lens group is less than 120mm, and the total optical length is less than 200 mm.

10. The lens of a cutting imaging lamp as claimed in claim 1, wherein: the rear intercept of the lens group is >60mm, and the projection angle is between 24 and 28 degrees.