CN215833687U

CN215833687U - Minizoom system of miniwatt

Info

Publication number: CN215833687U
Application number: CN202121464364.7U
Authority: CN
Inventors: 李唯宏; 梁湛阳
Original assignee: Heshan Jiamiji Photoelectric Technology Co ltd
Current assignee: Heshan Jiamiji Photoelectric Technology Co ltd
Priority date: 2021-06-30
Filing date: 2021-06-30
Publication date: 2022-02-15
Anticipated expiration: 2031-06-30

Abstract

The utility model discloses a minizoom system of miniwatt, minizoom system of miniwatt is including the lens group, the pattern piece that have positive focal power that arrange in proper order, and the lens group that wherein has positive focal power comprises the first lens group that has positive focal power of immobility, the mobilizable second lens group that has negative focal power and the mobilizable third lens group that has positive focal power, when keeping first lens group fixed unchangeable, realizes zooming through the relative motion between second lens group and the third lens group, ensures the definition of formation of image, the luminance degree of consistency when zooming. In order to ensure small imaging aberration, the high definition of imaging is ensured by arranging the pattern piece, and the imaging device is suitable for all small indoor places.

Description

Minizoom system of miniwatt

Technical Field

The utility model relates to the technical field of projection lenses, in particular to a low-power mini zoom system.

Background

In the stage lighting industry, low-power lamps are usually applied to small indoor places such as KTVs, bars, small stages and the like, the change range of the projection distance is limited by the size of the places, and fixed-focus lenses and small lamp bodies are often adopted for the lamps applied to the small indoor places. However, different customers have different projection angles to the fixed-focus lens, the lamp body is changed accordingly, and manufacturers need to make different lamps to meet the requirements of the customers, so that cost is increased substantially. The small-power lamps close to 150W in the market also adopt zoom lenses, but the total optical length is usually longer and is more than 180mm, the manufacturing cost is higher, and the utility model is suitable for meeting the requirements of customers on the change of the projection angle and the lamp body and reducing the cost.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the defects in the prior art and provides a low-power mini zoom system.

In order to achieve the purpose, the utility model adopts the following technical scheme: a minizoom system of miniwatt, including lens set and pattern piece with positive focal power arranged sequentially, wherein the lens set with positive focal power is made up of the first lens set with positive focal power, the second lens set with negative focal power and the third lens with positive focal power; the first lens group having positive power includes a first lens having positive power and a second lens having negative power; the first lens and the second lens of the first lens group with positive focal power are both spherical lenses; the first lens of the first lens group with positive focal power has a convex surface facing the object side surface and a convex surface facing the image side surface, and the second lens has a concave surface facing the object side surface and a convex surface facing the image side surface; the second lens group having negative power includes a third lens having negative power and a fourth lens having positive power; the third lens and the fourth lens of the second lens group with negative focal power are both spherical lenses; the object-facing surface and the image-facing surface of the third lens of the second lens group having negative refractive power are both concave, the object-facing surface of the fourth lens is convex, and the image-facing surface of the fourth lens is concave; the third lens group with positive focal power comprises a fifth lens with positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens with negative focal power, a ninth lens with positive focal power and a tenth lens with positive focal power; the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens and the tenth lens of the third lens group with positive focal power are all spherical lenses; the object-side-facing surface and the image-side-facing surface of the fifth lens of the third lens group having positive refractive power are both convex surfaces, the object-side-facing surface of the sixth lens is concave and the image-side-facing surface is convex, the object-side-facing surface of the seventh lens is convex and the image-side-facing surface is concave, the object-side-facing surface and the image-side-facing surface of the eighth lens are both concave, the object-side-facing surface of the ninth lens is flat and the image-side-facing surface is convex, and the object-side-facing surface of the tenth lens is convex and the image-side-facing surface is concave;

preferably, the total optical length of the lens group is 120mm, and the light-emitting aperture is 60 mm.

Preferably, the first lens of the first lens group with positive optical power is dense crown glass, and the second lens is dense flint glass.

Preferably, the third lens of the second lens group with negative focal power is dense crown glass, and the fourth lens is dense flint glass.

Preferably, the fifth lens, the ninth lens and the tenth lens of the third lens group with positive optical power are heavy crown glass, the sixth lens and the eighth lens are heavy flint glass, and the seventh lens is heavy barium flint glass.

The utility model has the following beneficial effects:

the utility model adopts a three-group lens zoom objective structure, the first lens group is fixed, and the zooming of the optical system is realized through the relative movement of the second lens group and the third lens group, so that the projection angle reaches 15-30 degrees, thereby not only ensuring the high definition and high contrast of the projection picture, but also having the zooming range of 2 times, and being suitable for all small indoor places. The total optical length is short, so that the optical lens is lighter, thinner, shorter and shorter, and the cost is reduced. Meanwhile, in order to ensure that imaging aberration is small, high definition of imaging is ensured by arranging the pattern piece, and the imaging device is suitable for all small indoor places.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an exploded view of the lens assembly of the present invention;

FIG. 3 is a vertical axis aberration diagram of the optical system of the lens group provided by the present invention;

FIG. 4 is a diagram of curvature of field and distortion aberration of the optical system of the lens group provided by the present invention;

FIG. 5 is a spherical aberration diagram of the optical system of the lens group according to the present invention;

FIG. 6 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.

FIG. 7 is a position diagram of a 15 degree projection angle of the lens assembly provided by the present invention;

FIG. 8 is a field curvature and distortion diagram of a 15 degree projection angle of the lens assembly provided by the present invention;

FIG. 9 is a vertical axis aberration diagram of a 15 degree projection angle of the lens assembly provided by the present invention;

FIG. 10 is a spherical aberration diagram of a 15-degree projection angle of the lens assembly provided by the present invention;

FIG. 11 is a position diagram of a 30 degree projection angle of the lens assembly provided by the present invention;

FIG. 12 is a graph showing curvature of field and distortion at a projection angle of 30 degrees for the lens group provided in the present invention;

FIG. 13 is a vertical axis aberration diagram of a 30 degree projection angle of the lens assembly provided by the present invention;

FIG. 14 is a spherical aberration diagram of 30 degree projection angle of the lens set provided by the present invention;

illustration of the drawings: the lens group 1, the pattern sheet 2, the first lens group G1, the first lens L1, the second lens L2, the second lens group G2, the third lens L3, the fourth lens L4, the third lens group G3, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, and the tenth lens L10.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-14, one embodiment of the present invention is provided: a minizoom system with small power comprises a lens group 1 with positive focal power and a pattern piece 2 which are sequentially arranged, wherein the total optical length of the lens group 1 is 120mm, and the light-emitting aperture is 60 mm. The lens group having positive power is composed of a first lens group G1 having positive power, a second lens group G2 having negative power, and a third lens L3 having positive power; the first lens group G1 having positive power includes a first lens L1 having positive power and a second lens L2 having negative power; the first lens L1 and the second lens L2 of the first lens group G1, which have positive optical power, are each a spherical lens; the object-side facing surface S1 and the image-side facing surface S2 of the first lens L1 of the first lens group G1 having positive optical power are both convex, the object-side facing surface S3 of the second lens L2 is concave, and the image-side facing surface S4 is convex; the second lens group G2 having negative power includes a third lens L3 having negative power and a fourth lens L4 having positive power; the third lens L3 and the fourth lens L4 of the second lens group G2 having negative optical power are each a spherical lens; the object-side facing surface S5 and the image-side facing surface S6 of the third lens L3 of the second lens group G2 having negative optical power are both concave, the object-side facing surface S7 of the fourth lens L4 is convex, and the image-side facing surface S8 is concave; the third lens group G3 having positive power includes a fifth lens L5 having positive power, a sixth lens L6 having negative power, a seventh lens L7 having positive power, an eighth lens L8 having negative power, a ninth lens L9 having positive power, and a tenth lens L10 having positive power; the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, and the tenth lens L10 of the third lens group G3, which have positive optical power, are all spherical lenses; the object-side facing surface S9 and the image-side facing surface S10 of the fifth lens L5 of the third lens group G3 having positive optical power are both convex, the object-side facing surface S11 of the sixth lens L6 is concave, the image-side facing surface S12 is convex, the object-side facing surface S13 of the seventh lens L7 is convex, the image-side facing surface S14 is concave, the object-side facing surface S15 and the image-side facing surface S16 of the eighth lens L8 are both concave, the object-side facing surface S17 of the ninth lens L9 is flat, the image-side facing surface S18 is convex, the object-side facing surface S19 of the tenth lens L10 is convex, and the image-side facing surface S20 is concave;

the first lens L1 of the first lens group G1 with positive focal power is heavy crown glass, the second lens L2 is heavy flint glass, the third lens L3 of the second lens group G2 with negative focal power is heavy crown glass, the fourth lens L4 is heavy flint glass, the fifth lens L5, the ninth lens L9 and the tenth lens L10 of the third lens group G3 with positive focal power are all heavy crown glass, the sixth lens L6 and the eighth lens L8 are all heavy flint glass, and the seventh lens L7 is heavy barium flint glass.

The optical total length of the lens group 1 is 120mm, and the light-emitting aperture is 60 mm.

Referring to fig. 6, fig. 6 shows the surface curvature radius, the pitch, the d-light refractive index, and the d-light abbe number of each lens included in the lens group of the present embodiment, wherein 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 air thickness between the first lens and the second lens, and the unit of the curvature radius 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 minizoom system of miniwatt, including lens set and pattern piece with positive focal power arranged sequentially, wherein the lens set with positive focal power is made up of the first lens set with positive focal power, the second lens set with negative focal power and the third lens with positive focal power; the first lens group having positive power includes a first lens having positive power and a second lens having negative power; the first lens and the second lens of the first lens group with positive focal power are both spherical lenses; the method is characterized in that: the first lens of the first lens group with positive focal power has a convex surface facing the object side surface and a convex surface facing the image side surface, and the second lens has a concave surface facing the object side surface and a convex surface facing the image side surface; the second lens group having negative power includes a third lens having negative power and a fourth lens having positive power; the third lens and the fourth lens of the second lens group with negative focal power are both spherical lenses; the object-facing surface and the image-facing surface of the third lens of the second lens group having negative refractive power are both concave, the object-facing surface of the fourth lens is convex, and the image-facing surface of the fourth lens is concave; the third lens group with positive focal power comprises a fifth lens with positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens with negative focal power, a ninth lens with positive focal power and a tenth lens with positive focal power; the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens and the tenth lens of the third lens group with positive focal power are all spherical lenses; the object-side-facing surface and the image-side-facing surface of the fifth lens of the third lens group having positive refractive power are both convex surfaces, the object-side-facing surface of the sixth lens is a concave surface, and the image-side-facing surface is a convex surface, the object-side-facing surface of the seventh lens is a convex surface, and the image-side-facing surface is a concave surface, the object-side-facing surface and the image-side-facing surface of the eighth lens are both concave surfaces, the object-side-facing surface of the ninth lens is a flat surface, and the image-side-facing surface is a convex surface, and the object-side-facing surface of the tenth lens is a convex surface, and the image-side-facing surface is a concave surface.

2. The minizoom system of claim 1, wherein: the optical total length of the lens group is 120mm, and the light-emitting aperture is 60 mm.