CN210605171U - Zoom projection lens - Google Patents
Zoom projection lens Download PDFInfo
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- CN210605171U CN210605171U CN201921924686.8U CN201921924686U CN210605171U CN 210605171 U CN210605171 U CN 210605171U CN 201921924686 U CN201921924686 U CN 201921924686U CN 210605171 U CN210605171 U CN 210605171U
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Abstract
The utility model relates to a zoom projection lens; a first lens group and a second lens group are sequentially arranged in an optical system of the lens from an object end to an image surface along light; the first lens group is a plano-concave negative lens, and the second lens group sequentially comprises a first biconvex positive lens, a second biconvex positive lens, a first biconcave negative lens, a second biconcave negative lens, a third biconvex positive lens and a fourth biconvex positive lens; the zoom lens has the advantages of being reasonable in structural design, reducing the number of lenses on the premise of not using aspheric lenses, reducing production cost, improving assembly yield, ensuring that the total length of the lens is 52mm so as to be matched with a portable projector, simultaneously realizing continuous zooming of 1.1 times, and being suitable for mass production.
Description
Technical Field
The utility model relates to a zoom projection lens.
Background
At present, the application of the projector is more and more extensive, but the development trend of the projector mainly has the characteristics of short projection distance, large projection range, high definition, small volume and the like. Various zoom lenses are available in the market, but in order to improve the imaging definition, the lenses usually adopt aspheric lenses or increase the number of lenses, but the above-mentioned methods result in higher cost of the lenses, low assembly yield, and are not suitable for mass production.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the defect among the prior art, and provide a structural design reasonable, thereby reduce the piece number use amount of lens under the prerequisite that does not use the aspheric surface lens and realize reduction in production cost and improve the equipment yield, can guarantee that the camera lens total length is 52mm so that match portable projector, can realize simultaneously 1.1 times zoom in succession and be applicable to the volume production zoom projection lens.
The purpose of the utility model is realized like this: a first lens group and a second lens group are sequentially arranged in an optical system of the lens from an object end to an image surface along light; the first lens group is a plano-concave negative lens, and the second lens group sequentially comprises a first biconvex positive lens, a second biconvex positive lens, a first biconcave negative lens, a second biconcave negative lens, a third biconvex positive lens and a fourth biconvex positive lens.
Preferably, the air space between the first lens group and the second lens group is 22.86mm for short focus and 30.18mm for long focus.
Preferably, the second biconcave negative lens and the third biconvex positive lens form a cemented lens group, the air interval between the first biconvex positive lens and the second biconvex positive lens is 1.10mm, the air interval between the second biconvex positive lens and the first biconcave negative lens is 8.65mm, the air interval between the first biconcave negative lens and the cemented lens group is 0.84mm, and the air interval between the cemented lens group and the fourth biconvex positive lens is 0.10 mm.
Preferably, the mechanical structure of the lens comprises a first group frame, a second group frame and a rear group which are sequentially arranged from the object end to the image surface along the light; a plano-concave negative lens is arranged inside the first group frame; a first biconvex positive lens, a second biconvex positive lens, a first biconcave negative lens, a second biconcave negative lens, a third biconvex positive lens and a fourth biconvex positive lens are arranged in the rear group; and a focusing assembly is arranged between the first group frame and the second group frame, and a zooming assembly is arranged between the second group frame and the rear group.
Preferably, the focusing assembly comprises a plurality of first curve grooves formed in the outer surface of the first group of frames, the second group of frames are sleeved inside the first group of frames, clamping grooves are formed in the positions, corresponding to the first curve grooves, of the second group of frames, rolling wheels are arranged in the clamping grooves, and screws connected with the second group of frames penetrate through the middle portions of the rolling wheels.
Preferably, the first curved groove is three.
Preferably, the zooming assembly comprises a plurality of second curve grooves formed in the outer surface of the second group frame, the rear group is sleeved inside the second group frame, and the stud penetrates through the second curve grooves to be connected with the rear group.
Preferably, the second curved groove is three.
Preferably, the second group frame is provided with a flange panel with an integral structure at the tail end.
The utility model has the advantages of structural design is reasonable, thereby the number of lenses use amount of lens reduces under the prerequisite that does not use the aspheric surface lens realizes reduction in production cost and improves the equipment yield, can guarantee that the camera lens total length is 52mm so that match portable projector, can realize simultaneously 1.1 times zoom in succession and be applicable to the volume production.
Drawings
Fig. 1 is a schematic view of an optical system according to the present invention.
Fig. 2 is a schematic structural diagram of the present invention.
Fig. 3 is a partially enlarged view of a portion a in fig. 2.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings, in which like reference numerals refer to like parts in the drawings. For the sake of simplicity, only the parts related to the utility model are schematically shown in the drawings, and they do not represent the actual structure as a product.
As shown in fig. 1, 2 and 3, the present invention relates to a zoom projection lens, wherein a first lens set and a second lens set are sequentially disposed along light from an object end to an image plane in an optical system of the lens; the first lens group is a plano-concave negative lens 1, and the second lens group sequentially comprises a first biconvex positive lens 2, a second biconvex positive lens 3, a first biconcave negative lens 4, a second biconcave negative lens 5, a third biconvex positive lens 6 and a fourth biconvex positive lens 7. The short-focus air space between the first lens group and the second lens group is 22.86mm, and the long-focus air space is 30.18 mm. The second biconcave negative lens 5 and the third biconvex positive lens 6 form a cemented lens group, the air interval between the first biconvex positive lens 2 and the second biconvex positive lens 3 is 1.10mm, the air interval between the second biconvex positive lens 3 and the first biconcave negative lens 4 is 8.65mm, the air interval between the first biconcave negative lens 4 and the cemented lens group is 0.84mm, and the air interval between the cemented lens group and the fourth biconvex positive lens 7 is 0.10 mm. The mechanical structure of the lens comprises a first group frame 8, a second group frame 10 and a rear group 13 which are sequentially arranged from an object end to an image surface along light rays; a plano-concave negative lens 1 is arranged inside the first group frame 8; a first biconvex positive lens 2, a second biconvex positive lens 3, a first biconcave negative lens 4, a second biconcave negative lens 5, a third biconvex positive lens 6 and a fourth biconvex positive lens 7 are arranged inside the rear group 13; a focusing component is arranged between the first group frame 8 and the second group frame 10, and a zooming component is arranged between the second group frame 10 and the rear group 13. The focusing assembly comprises a plurality of first curve grooves 14 formed in the outer surface of a first group frame 8, a second group frame 10 is sleeved inside the first group frame 8, clamping grooves 15 are formed in positions, corresponding to the first curve grooves 14, of the second group frame 10, rolling wheels 16 are arranged in the clamping grooves 15, and screws 9 connected with the second group frame 10 penetrate through the middle portions of the rolling wheels 16. The number of the first curved grooves 14 is three. The zooming assembly comprises a plurality of second curve grooves 11 formed in the outer surface of the second group frame 10, the rear group 13 is sleeved inside the second group frame 10, and the stud 17 penetrates through the second curve grooves 11 to be connected with the rear group 13. The number of the second curved grooves 11 is three. The end of the second group frame 10 is provided with a flange panel 12 which is an integrated structure.
When the projection lens works, the first lens group is a focusing group, the second lens group is a zooming group, the system diaphragm is arranged in the second lens group, between the second biconvex positive lens 3 and the first biconcave negative lens 4 and close to the first biconcave negative lens 4, the aperture of the diaphragm is unchanged, the zooming of the lens is realized through the movement of the two lens groups, and the focal length of the lens is changed to 20.76 (short focus) -22.8 (long focus); when zooming is required, the stud 17 slides in the second curve groove 11, and meanwhile, the stud 17 is connected with the rear group 13, so that relative displacement is generated between the rear group 13 and the second group frame 10, and zooming is achieved. When focusing is needed, the roller 16 slides in the first curve groove, the roller 16 drives the second group frame 10 through the screw 9, so that relative displacement is generated between the first group frame 8 and the second group frame 10, and focusing can be realized; the utility model discloses in flange panel 12 be used for the projecting apparatus to link to each other.
The utility model discloses well zoom lens's structural parameter is as follows:
the utility model discloses well each lens parameter design value as follows:
wherein lens L1 denotes a plano-concave negative lens 1, lens L2 denotes a first biconvex positive lens 2, lens L3 denotes a second biconvex positive lens 3, lens L4 denotes a first biconcave negative lens 4, lens L5 denotes a second biconcave negative lens 5, lens L6 denotes a third biconvex positive lens 6, and lens L7 denotes a fourth biconvex positive lens 7; wherein R refers to a spherical lens.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected," "connecting," and the like are to be construed broadly, and may be, for example, fixedly connected, integrally connected, or detachably connected; or communication between the interior of the two elements; they may be directly connected or indirectly connected through an intermediate, and those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific situation. The above examples are only specific illustrations of feasible embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments, modifications and alterations without departing from the technical spirit of the present invention are intended to be included in the scope of the present invention.
Claims (9)
1. A zoom projection lens, comprising: a first lens group and a second lens group are sequentially arranged in an optical system of the lens from an object end to an image surface along light;
the first lens group is a plano-concave negative lens (1),
the second lens group sequentially comprises a first biconvex positive lens (2), a second biconvex positive lens (3), a first biconcave negative lens (4), a second biconcave negative lens (5), a third biconvex positive lens (6) and a fourth biconvex positive lens (7).
2. A zoom projection lens according to claim 1, wherein: the short-focus air space between the first lens group and the second lens group is 22.86mm, and the long-focus air space is 30.18 mm.
3. A zoom projection lens according to claim 1, wherein: the second biconcave negative lens (5) and the third biconvex positive lens (6) form a cemented lens group, the air interval between the first biconvex positive lens (2) and the second biconvex positive lens (3) is 1.10mm, the air interval between the second biconvex positive lens (3) and the first biconcave negative lens (4) is 8.65mm, the air interval between the first biconcave negative lens (4) and the cemented lens group is 0.84mm, and the air interval between the cemented lens group and the fourth biconvex positive lens (7) is 0.10 mm.
4. A zoom projection lens according to claim 1, wherein: the mechanical structure of the lens comprises a first group frame (8), a second group frame (10) and a rear group (13) which are sequentially arranged from an object end to an image surface along light rays; a plano-concave negative lens (1) is arranged inside the first group frame (8); a first biconvex positive lens (2), a second biconvex positive lens (3), a first biconcave negative lens (4), a second biconcave negative lens (5), a third biconvex positive lens (6) and a fourth biconvex positive lens (7) are arranged inside the rear group (13); a focusing assembly is arranged between the first group frame (8) and the second group frame (10), and a zooming assembly is arranged between the second group frame (10) and the rear group (13).
5. A zoom projection lens according to claim 4, wherein: the focusing assembly comprises a plurality of first curve grooves (14) formed in the outer surface of a first group of frames (8), a second group of frames (10) are sleeved inside the first group of frames (8), clamping grooves (15) are formed in the positions, corresponding to the first curve grooves (14), of the second group of frames (10), rolling wheels (16) are arranged in the clamping grooves (15), and screws (9) connected with the second group of frames (10) are arranged in the middle of the rolling wheels (16) in a penetrating mode.
6. A zoom projection lens according to claim 5, wherein: the number of the first curve grooves (14) is three.
7. A zoom projection lens according to claim 4, wherein: the zooming assembly comprises a plurality of second curve grooves (11) formed in the outer surface of the second group frame (10), the rear group (13) is sleeved inside the second group frame (10), and the stud (17) penetrates through the second curve grooves (11) to be connected with the rear group (13).
8. A zoom projection lens according to claim 7, wherein: the number of the second curve grooves (11) is three.
9. A zoom projection lens according to claim 4, wherein: the tail end of the second group frame (10) is provided with a flange panel (12) which is of an integrated structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921924686.8U CN210605171U (en) | 2019-11-09 | 2019-11-09 | Zoom projection lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921924686.8U CN210605171U (en) | 2019-11-09 | 2019-11-09 | Zoom projection lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210605171U true CN210605171U (en) | 2020-05-22 |
Family
ID=70695725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921924686.8U Active CN210605171U (en) | 2019-11-09 | 2019-11-09 | Zoom projection lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210605171U (en) |
-
2019
- 2019-11-09 CN CN201921924686.8U patent/CN210605171U/en active Active
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