CN109991718A - A kind of focal length projection lens and projector - Google Patents
A kind of focal length projection lens and projector Download PDFInfo
- Publication number
- CN109991718A CN109991718A CN201910133773.XA CN201910133773A CN109991718A CN 109991718 A CN109991718 A CN 109991718A CN 201910133773 A CN201910133773 A CN 201910133773A CN 109991718 A CN109991718 A CN 109991718A
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- lens
- focal length
- length projection
- projection lens
- projection
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- 230000003287 optical effect Effects 0.000 claims abstract description 18
- 239000000571 coke Substances 0.000 claims abstract description 14
- 239000011521 glass Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 12
- 230000005499 meniscus Effects 0.000 claims description 6
- 238000009738 saturating Methods 0.000 claims description 4
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims 1
- 230000008859 change Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 7
- 239000004973 liquid crystal related substance Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention discloses a kind of focal length projection lens and projectors, including from shadowgraph surface side to display device side the first lens with positive light coke that successively optical axis overlaps, the second lens with negative power, with the third lens of positive light coke, wherein: the focal length of first lens is f1, and 110mm < f1 < 145mm；The focal length of second lens is f2, and -75mm < f2 < -50mm；The focal length of the third lens is f3, and 75mm < f3 < 105mm.By the design requirement for meeting focal length from shadowgraph surface side to display device side the first lens with positive light coke that successively optical axis overlaps, the second lens with negative power, the third lens with positive light coke, change the structure of existing focal length projection lens, lens numbers are less, structure is simple, reduces cost of manufacture；In addition, the present invention has preferable projection resolution.
Description
Technical field
The invention belongs to optical image technology field, it is related to a kind of focal length projection lens and projector.
Background technique
With advances in technology and the development of consumer electronics industry, the form of product is in product design, increasingly
It is important.Single panel LCD liquid crystal projector, since its is low in cost, effect is fine, so, start to be liked by more consumers.Mesh
Before, due to projector's optical path problem, so its form is constantly in the state of a difficult change of comparison, this is that industry is endeavoured to study
One of highest priority.
Summary of the invention
It is an object of the invention to: a kind of focal length projection lens and projector are provided, is solved due to projector's optical path
Problem, so the problem of its form is constantly in the state of a difficult change of comparison.
The technical solution adopted by the invention is as follows:
A kind of focal length projection lens, including from shadowgraph surface side to display device side successively optical axis overlap have just
First lens of focal power, the second lens with negative power, the third lens with positive light coke, in which: described first
The focal length of lens is f1, and 110mm < f1 < 145mm；The focal length of second lens is f2, and -75mm < f2 < -50mm；Third
The focal length of lens is f3, and 75mm < f3 < 105mm.
Further, first lens are positive meniscus lens or biconvex lens, and second lens are biconcave lens, institute
Stating the third lens is biconvex lens.
Further, first lens are positive meniscus lens, and the projection lens meets conditional: 60mm < R1 <
90mm, R2>300mm, -120mm<R3<-70mm, 65mm<R4<90mm, -160mm<R5<320mm, -85mm<R6<-60mm；Its
In, R1, R2, R3, R4, R5, R6 are respectively the preceding radius of curvature and rear curvature half of the first lens, the second lens and the third lens
Diameter.
Further, first lens are biconvex lens, and the projection lens meets conditional: 60mm < R1 < 90mm,
R2>-1000mm, -120mm<R3<-70mm, 65mm<R4<90mm, -160mm<R5<320mm, -85mm<R6<-60mm；Wherein,
R1, R2, R3, R4, R5, R6 are respectively the preceding radius of curvature and rear radius of curvature of the first lens, the second lens and the third lens.
Further, the focal length projection lens also meets following formula, 20mm < d1 < 31mm, 10mm < d2 < 22mm, and d1, d2 divide
Not Wei the first lens and the second lens spacing, the spacing of the second lens and the third lens.
Further, first lens are made of weight crown class glass material, and first lens meet following formula: 1.56
< n1 < 1.64,54 < vd1 < 6；N1 is the refractive index of the first lens, the abbe number of the first lens of vd1.
Further, second lens are made of flint or dense flint class glass, and second lens meet following formula:
1.6 < n2 < 1.75,25 < vd2 < 35；N2 is the refractive index of the second lens, the abbe number of the second lens of vd2.
Further, the third lens are made of weight crown or crown class glass, and the third lens meet following formula: 1.51
< n3 < 1.64,54 < vd3 < 64；N3 is the refractive index of the third lens, the abbe number of vd3 the third lens.
It further, further include aperture diaphragm, the aperture diaphragm is arranged in first lens and second lens
Between.
A kind of projector, including focal length projection lens described above and display device.
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are:
The present invention passes through from shadowgraph surface side to display device side the with positive light coke that successively optical axis overlaps
One lens, the second lens with negative power, the third lens with positive light coke meet the design requirement of focal length, provide one
The structure of the new focal length projection lens of kind, lens numbers are less, and structure is simple, reduce cost of manufacture；In addition, the present invention have compared with
Good projection resolution.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings, in which:
Fig. 1 is a kind of structural schematic diagram of focal length projection lens of the present invention；
Fig. 2 is a kind of imaging schematic diagram of projector of the present invention；
Marked in the figure: 100- focal length projection lens, the first lens of 101-, the second lens of 102-, 103- the third lens, 104-
Aperture diaphragm, 200- projector, 201-LCD liquid crystal display, the first reflecting mirror of 202-, the second reflecting mirror of 203-, 204- Fresnel are saturating
Mirror.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention, i.e., described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is logical
The component for the embodiment of the present invention being often described and illustrated herein in the accompanying drawings can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiment of the present invention provided in the accompanying drawings is not intended to limit below claimed
The scope of the present invention, but be merely representative of selected embodiment of the invention.Based on the embodiment of the present invention, those skilled in the art
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
It should be noted that the relational terms of term " first " and " second " or the like be used merely to an entity or
Operation is distinguished with another entity or operation, and without necessarily requiring or implying between these entities or operation, there are any
This actual relationship or sequence.Moreover, the terms "include", "comprise" or its any other variant be intended to it is non-exclusive
Property include so that include a series of elements process, method, article or equipment not only include those elements, but also
Further include other elements that are not explicitly listed, or further include for this process, method, article or equipment it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including described
There is also other identical elements in the process, method, article or equipment of element.
Embodiment 1
As shown in Figure 1, a kind of focal length projection lens, including successively optical axis overlapping is set from shadowgraph surface side to display device side
The first lens 101 with positive light coke for setting, the second lens 102 with negative power, the third with positive light coke are saturating
Mirror 103, in which: the focal length of first lens 101 is f1, and 110mm < f1 < 145mm；The focal length of second lens 102 is
F2, and -75mm < f2 < -50mm；The focal length of the third lens 103 is f3, and 75mm < f3 < 105mm.When implementation, pass through successively optical axis
The first lens 101 with positive light coke for overlapping, the second lens 102 with negative power, with positive light coke
The third lens 103 meet the design requirement of focal length, and convenient for providing a kind of new focal length projection lens 100, lens numbers are less, knot
Structure is simple, reduces cost of manufacture；In addition, the present invention has preferable projection resolution.
Wherein, flexion ability of the focal power characterization optical system to incoming parallel beam.It is indicated herein with fn, n expression pair
The numerical value of the serial number for the lens answered, fn is bigger, and collimated light beam is rolled over more severe；When fn > 0, flexion is convergent；When fn < 0,
Flexion is diversity.When fn=0, correspond to, as plane refraction.It at this moment, is still along axis after reflecting along axis collimated light beam
Collimated light beam does not occur flexion phenomenon.
Specifically, first lens 101 are positive meniscus lens or biconvex lens, and second lens 102 are that concave-concave is saturating
Mirror, the third lens 103 are biconvex lens.When implementation, first lens 101, the second lens 102, the third lens 103 are not
It is confined to a single eyeglass, may each be lens group or the equivalent lens that balsaming lens is formed.For example, the first lens
101 when being positive meniscus lens, which can be at least two different lens axis and overlap or glued
Lens group, as long as can achieve the effect that same optical property.Such as first lens 101 be biconvex lens when, should
Biconvex lens can be two same or different lens axis and overlap or glued lens group, as long as can reach
To the effect of same optical property.
Wherein, first lens 101 are positive meniscus lens, and the projection lens meets conditional: 60mm < R1 < 90mm,
R2>300mm, -120mm<R3<-70mm, 65mm<R4<90mm, -160mm<R5<320mm, -85mm<R6<-60mm；Wherein, R1,
R2, R3, R4, R5, R6 are respectively the preceding radius of curvature and rear curvature of the first lens 101, the second lens 102 and the third lens 103
Radius.When implementation, convenient for selecting suitable first lens 101, the second lens 102 and the third lens 103 according to actual needs.
In addition, first lens 101 are biconvex lens, the projection lens meets conditional: 60mm < R1 < 90mm, R2
>-1000mm, -120mm<R3<-70mm, 65mm<R4<90mm, -160mm<R5<320mm, -85mm<R6<-60mm；Wherein, R1,
R2, R3, R4, R5, R6 are respectively the preceding radius of curvature and rear curvature of the first lens 101, the second lens 102 and the third lens 103
Radius.When implementation, convenient for selecting suitable first lens 101, the second lens 102 and the third lens 103 according to actual needs.
Preferably, the focal length projection lens 100 also meets following formula, 20mm < d1 < 31mm, 10mm < d2 < 22mm, d1, d2
The respectively spacing of the first lens 101 and the second lens 102, the spacing of the second lens 102 and the third lens 103.It is excellent when implementation
Selection of land, the length of the focal length projection lens 100 is between 40mm between 100mm.In addition, the focal length projection lens 100 has
Effective focal length, the effective focal length is between 160mm between 200mm.
Preferably, first lens 101 are made of weight crown class glass material, and first lens 101 meet following formula:
1.56 < n1 < 1.64,54 < vd1 < 6；N1 is the refractive index of the first lens 101, the abbe number of the first lens of vd1 101.Implement
When, the material that the first lens 101 use is not limited to weight crown class glass, can be made of materials such as plastics, quartz, it is only necessary to
Meet 1.56 < n1 < 1.64, the optical property of 54 < vd1 < 6.
Preferably, second lens 102 are made of flint or dense flint class glass, and second lens 102 meet
Following formula: 1.6 < n2 < 1.75,25 < vd2 < 35；N2 is the refractive index of the second lens 102, the abbe number of the second lens of vd2 102.
When implementation, the material that the second lens 102 use is not limited to weight crown class glass, can be made of materials such as plastics, quartz, only
Need to meet 1.6 < n2 < 1.75, the optical property of 25 < vd2 < 35.
Preferably, the third lens 103 are made of weight crown or crown class glass, and the third lens 103 meet following formula:
1.51 < n3 < 1.64,54 < vd3 < 64；N3 is the refractive index of the third lens 103, the abbe number of vd3 the third lens 103.Third
The material that lens 103 use is not limited to weight crown class glass, can be made of materials such as plastics, quartz, it is only necessary to meet
1.51 < n3 < 1.64, the optical property of 54 < vd3 < 64.
In addition, further including aperture diaphragm 104, the setting of aperture diaphragm 104 is in first lens 101 and described second
Between lens 102.When implementation, aperture diaphragm 104 is used to control the throughput of light, and further compresses focal length projection lens
100 overall volume.
Embodiment 2
As shown in Fig. 2, the present invention provides a kind of projector, including 100 He of focal length projection lens described in embodiment 1
Display device 200.
For display device 200 in the present embodiment by taking LCD liquid crystal display 201 as an example, the size of LCD liquid crystal display 201 is 4.3 inches
16:9, and resolution ratio be 1280*720 mode under, design that a set of relative cost is low, the excellent projector's imaging optical path of structure
With corresponding device.The design data of the focal length projection lens 100 is as follows:
Wherein, the forward and backward radius of curvature of the first lens 101 is respectively 80.60mm and infinity.First lens 101
The vertex distance of front surface and rear surface is 7.50mm, and the HZK11 material for the use of brand being CDGM meets index requirements.The
The forward and backward radius of curvature of two lens 102 is -85.40mm and 75.72mm, the front surface and rear surface of second lens 102 respectively
The distance between vertex be 3.00mm, the HF4 material for the use of brand being CDGM meets refractive index design requirement.The third lens
103 forward and backward radius of curvature is 302.70mm and -71.00 millimeters respectively, the front surfaces of the third lens 103 and rear surface
The distance between vertex is 9.80mm.The HZK11 material for the use of brand being CDGM, refractive index meet design requirement.First thoroughly
Spacing d1 between mirror 101 and the second lens 102 is 26.20mm, the spacing d2 between the second lens 102 and the third lens 103
For 18.50mm.At this point, the length of the entire focal length projection lens 100 is 65.00mm.
In addition, the focal length projection lens 100, the optical path of imaging optics includes the first reflecting mirror 202 and second
Reflecting mirror 203, the first reflecting mirror 202 and the second reflecting mirror 203 are in 90 degree of vertical relations, be surface reflection plane it is anti-
Penetrate mirror.
Preferably, a Fresnel Lenses 204 is also provided with behind LCD liquid crystal display 201.The Fresnel Lenses 204 tool
There is positive light coke, and the focus design logic of the Fresnel Lenses 204 is the equivalent focal length close to the focal length projection lens 100.
That is 150mm < f4 < 300mm.
This projector is because having used the focal length projection lens 100, therefore beneficial effect is similar, and details are not described herein again.
The foregoing is merely illustrative of the preferred embodiments of the present invention, the protection scope being not intended to limit the invention, any
Those skilled in the art within the spirit and principles in the present invention made by any modifications, equivalent replacements, and improvements etc.,
It should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of focal length projection lens, it is characterised in that: including from shadowgraph surface side to display device side, successively optical axis overlapping is set
The first lens with positive light coke, the second lens with negative power, the third lens with positive light coke set,
In: the focal length of first lens is f1, and 110mm < f1 < 145mm；The focal length of second lens is f2, and -75mm < f2
<-50mm；The focal length of the third lens is f3, and 75mm < f3 < 105mm.
2. a kind of focal length projection lens according to claim 1, it is characterised in that: first lens are positive meniscus lens
Or biconvex lens, second lens are biconcave lens, the third lens are biconvex lens.
3. a kind of focal length projection lens according to claim 2, it is characterised in that: first lens bent moon that is positive is saturating
Mirror, the projection lens meet conditional: 60mm<R1<90mm, R2>300mm, -120mm<R3<-70mm, 65mm<R4<
90mm, -160mm < R5 < 320mm, -85mm < R6 < -60mm；Wherein, R1, R2, R3, R4, R5, R6 are respectively the first lens, second
The preceding radius of curvature and rear radius of curvature of lens and the third lens.
4. a kind of focal length projection lens according to claim 2, it is characterised in that: first lens are biconvex lens,
The projection lens meets conditional: 60mm<R1<90mm, R2>-1000mm, -120mm<R3<-70mm, 65mm<R4<90mm, -
160mm < R5 < 320mm, -85mm < R6 < -60mm；Wherein, R1, R2, R3, R4, R5, R6 be respectively the first lens, the second lens and
The preceding radius of curvature and rear radius of curvature of the third lens.
5. a kind of focal length projection lens according to claim 1, it is characterised in that: under the focal length projection lens also meets
Formula, 20mm < d1 < 31mm, 10mm < d2 < 22mm, d1, d2 are respectively the spacing of the first lens and the second lens, the second lens and
The spacing of three lens.
6. a kind of focal length projection lens according to claim 1, it is characterised in that: first lens are using weight crown class glass
Glass material is made, and first lens meet following formula: 1.56 < n1 < 1.64,54 < vd1 < 6；N1 is the refractive index of the first lens,
The abbe number of the first lens of vd1.
7. a kind of focal length projection lens according to claim 1, it is characterised in that: second lens are using flint or again
Flint class glass is made, and second lens meet following formula: 1.6 < n2 < 1.75,25 < vd2 < 35；N2 is the refraction of the second lens
Rate, the abbe number of the second lens of vd2.
8. a kind of focal length projection lens according to claim 1, it is characterised in that: the third lens are using weight crown or crown
Class glass is made, and the third lens meet following formula: 1.51 < n3 < 1.64,54 < vd3 < 64；N3 is the refractive index of the third lens,
The abbe number of vd3 the third lens.
9. a kind of focal length projection lens according to claim 1, it is characterised in that: it further include aperture diaphragm, the aperture
Diaphragm is arranged between first lens and second lens.
10. a kind of projector, it is characterised in that: including focal length projection lens described in any one of claim 1-9 and display
Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910133773.XA CN109991718B (en) | 2019-02-22 | 2019-02-22 | Long-focus projection lens and projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910133773.XA CN109991718B (en) | 2019-02-22 | 2019-02-22 | Long-focus projection lens and projector |
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| Publication Number | Publication Date |
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| CN109991718A true CN109991718A (en) | 2019-07-09 |
| CN109991718B CN109991718B (en) | 2024-04-12 |
Family
ID=67130359
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910133773.XA Active CN109991718B (en) | 2019-02-22 | 2019-02-22 | Long-focus projection lens and projector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111880362A (en) * | 2020-07-03 | 2020-11-03 | 北京理工大学 | Large-size projection lens and projection system using same |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109991718B (en) | 2024-04-12 |
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