CN212694141U

CN212694141U - Zoom additional lens group with transmittance of 0.79:1

Info

Publication number: CN212694141U
Application number: CN202020502452.0U
Authority: CN
Inventors: 陈勇
Original assignee: Wuhan New Perspective Optoelectronic Technology Co ltd
Current assignee: Wuhan New Perspective Optoelectronic Technology Co ltd
Priority date: 2020-04-08
Filing date: 2020-04-08
Publication date: 2021-03-12
Anticipated expiration: 2030-04-08

Abstract

The utility model discloses a transmittance is 0.79: 1's zoom additional lens group sets gradually first optical objective, second optical objective and third optical objective from nearly thing side to the far away thing side direction, and first optical objective and second optical objective are meniscus lens, and third optical objective is plano-convex lens, and the distance between first optical objective's rear surface central point and the second optical objective's the front surface central point is 20.3921mm, and the distance between second optical objective's rear surface central point and the third optical objective's the front surface central point is 30.7667mm, the utility model discloses simple structure is fit for mass production, uses can realize the projection of big picture on the dlp projector to can realize no colour difference, display effect is good.

Description

Zoom additional lens group with transmittance of 0.79:1

Technical Field

The utility model relates to the field of projection equipment, especially, relate to a transmittance is zoom add lens assembly of 0.79: 1.

Background

With the development of projection technology, more and more projection devices are applied in various fields, and in order to obtain a larger projection picture or obtain a better visual effect, people usually assemble a projector to realize the projection size of a large picture in a certain space. Then, due to space limitation, the size of the projection screen of the conventional projector is also limited, and when the distance between the projector and the projection screen exceeds a certain distance, the screen projected by the projector is blurred, and the optical performance of the projector also starts to deteriorate. Therefore, as people demand larger and larger projection screen size, the lens group of the existing projector is difficult to meet the demand growth.

Disclosure of Invention

The utility model aims to solve the defects of the prior art and provide a zoom additional lens group with the transmittance of 0.79: 1.

The utility model adopts the technical scheme as follows:

a zoom additional lens group with a transmittance of 0.79:1 is provided with a first optical objective, a second optical objective and a third optical objective in sequence from a near object side to a far object side, wherein the first optical objective, the second optical objective and the third optical objective are arranged on the same optical axis, the distance between the center point of the rear surface of the first optical objective and the center point of the front surface of the second optical objective is 20.3921mm, and the distance between the center point of the rear surface of the second optical objective and the center point of the front surface of the third optical objective is 30.7667 mm.

Further, the first optical objective lens is a meniscus lens, the near object side is a convex spherical surface, the center thickness is 5mm, the thicknesses of the two ends are 10.2298mm, the height of the spherical surface is 106mm, the radius of the near object side is 100mm, and the radius of the far object side is 50.426 mm.

Furthermore, the material of the first optical objective lens is ZK 12.

Further, the second optical objective lens is a meniscus lens, the near object side is a convex spherical surface, the center thickness is 5mm, the thicknesses of the two ends are 13.5797mm, the height of the spherical surface is 92mm, the radius of the near object side is 168mm, and the radius of the far object side is 56 mm.

Furthermore, the material of the second optical objective is H-LAK 53A.

Further, the third optical objective lens is a plano-convex lens, the far object side is a convex spherical surface, the center thickness is 16mm, the thicknesses of the two ends are 3.8981mm, the height of the spherical surface is 83.5307mm, the near object side is a plane, and the radius of the far object side is 78.12 mm.

Furthermore, the material of the third optical objective lens is ZBAF 15.

The utility model has the advantages that: the utility model discloses an above-mentioned design has realized that a transmittance is 0.79: 1's zoom additional lens group, the utility model discloses simple structure, camera lens total number are few, are fit for mass production to no colour difference, formation of image are effectual, are fit for using on the projected projector of various big pictures.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

the labels in the figure are: 1-first optical objective, 2-second optical objective, 3-third optical objective.

Detailed Description

In order to make the technical solution of the present invention more clearly and completely appear, the present invention is described in detail below with reference to the accompanying drawings.

As shown in fig. 1, a zoom lens assembly with a transmittance of 0.79:1, wherein a first optical objective 1, a second optical objective 2 and a third optical objective 3 are sequentially disposed from a near object side to a far object side, the first optical objective 1, the second optical objective 2 and the third optical objective 3 are disposed on the same optical axis, wherein a distance between a center point of a rear surface of the first optical objective 1 and a center point of a front surface of the second optical objective 2 is 20.3921mm, and a distance between a center point of a rear surface of the second optical objective 2 and a center point of a front surface of the third optical objective 3 is 30.7667 mm.

The first optical objective lens 1 is a meniscus lens, the near object side is a convex spherical surface, the center thickness is 5mm, the thicknesses of the two ends are 10.2298mm, the height of the spherical surface is 106mm, the radius of the near object side is 100mm, the radius of the far object side is 50.426mm, and the material is ZK 12.

The second optical objective lens 2 is a meniscus lens, the near object side is a convex spherical surface, the center thickness is 5mm, the thicknesses of the two ends are 13.5797mm, the height of the spherical surface is 92mm, the radius of the near object side is 168mm, the radius of the far object side is 56mm, and the material is H-LAK 53A.

The third optical objective 3 is a plano-convex lens, the far object side is a convex spherical surface, the center thickness is 16mm, the thicknesses of both ends are 3.8981mm, the height of the spherical surface is 83.5307mm, the near object side is a plane, the radius of the far object side is 78.12mm, and the material is ZBAF 15.

The utility model discloses an above-mentioned design obtains zooms extra lens group, and its transmittance is 0.79:1, the projector can realize the projection of a larger picture when being applied to the projector, and has no chromatic aberration and good visual effect.

The foregoing is considered as illustrative and not restrictive of the preferred embodiments of the invention, and all changes, equivalents and modifications that come within the spirit and scope of the invention are desired to be protected.

Claims

1. A zoom additional lens group with a transmittance of 0.79:1 is characterized in that a first optical objective lens, a second optical objective lens and a third optical objective lens are sequentially arranged from a near object side to a far object side, the first optical objective lens, the second optical objective lens and the third optical objective lens are arranged on the same optical axis, wherein the distance between the central point of the rear surface of the first optical objective lens and the central point of the front surface of the second optical objective lens is 20.3921mm, the distance between the central point of the rear surface of the second optical objective lens and the central point of the front surface of the third optical objective lens is 30.7667mm, the first optical objective lens is a meniscus lens, the near object side is a convex spherical surface, the central thickness is 5mm, the thicknesses of both ends are 10.2298mm, the height of the spherical surface is 106mm, the radius of the near object side is 100mm, the radius of the far object side is 50.426mm, the second optical objective lens is a meniscus lens, the near object side is a convex spherical surface, and the central thickness is, the thickness of both ends is 13.5797mm, and the sphere height is 92mm, and near object side radius is 168mm, and distance object side radius is 56mm, third optical objective is planoconvex lens, and the object side of far away is convex sphere, and center thickness is 16mm, and both ends thickness is 3.8981mm, and the sphere height is 83.5307mm, and the object side of near is the plane, and distance object side radius is 78.12 mm.

2. The zoom lens assembly of claim 1, wherein the first objective lens is ZK 12.

3. The zoom lens assembly of claim 1, wherein the second objective lens is made of H-LAK 53A.

4. The zoom lens assembly of claim 1, wherein the third objective lens is made of ZBAF 15.