CN107861317A - Projection lens - Google Patents
Projection lens Download PDFInfo
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- CN107861317A CN107861317A CN201711375247.1A CN201711375247A CN107861317A CN 107861317 A CN107861317 A CN 107861317A CN 201711375247 A CN201711375247 A CN 201711375247A CN 107861317 A CN107861317 A CN 107861317A
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- Prior art keywords
- lens
- projection lens
- projection
- focal length
- image
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- 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
- G03B21/142—Adjusting of projection optics
-
- 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
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/003—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having two lenses
Abstract
This application discloses a kind of projection lens, the projection lens is extremely sequentially included along optical axis by image source side into image side：The first lens with positive light coke；And the second lens with positive light coke.At least one lens in first lens and the second lens are the lens of glass material.Total the effective focal length f and the second lens of projection lens effective focal length f2 meet 1 ＜ f/f2 ＜ 1.5.
Description
Technical field
The application is related to a kind of projection lens, more specifically, the application is related to a kind of projection lens for including two panels lens.
Background technology
In recent years, as the continuous progress of science and technology, three dimensional depth application are progressively risen, the application of projection lens is also more next
It is wider.Nowadays, chip technology is quickly grown with intelligent algorithm, to space object projects images and is received using optical projection lenses
The picture signal, you can calculate the 3-D view with object space depth information.3-D view with depth information can
It is further used for a variety of good application exploitations such as bio-identification.
For the conventional projection camera lens of imaging, generally various aberrations are eliminated simultaneously by using the mode of increase lens numbers
Improve resolution ratio.But increase lens numbers can cause the optics total length of projection lens to increase, so as to be unfavorable for realizing camera lens
Miniaturization.In addition, the big angle of visual field projection lens of in general can also have an amount of distortion big, problems such as image quality difference, and
It can not arrange in pairs or groups accurately to realize redistribution of the projected light beam on target object with diffractive-optical element (DOE).
The content of the invention
This application provides be applicable to portable type electronic product, can at least solve or part solve it is of the prior art
The projection lens of above-mentioned at least one shortcoming.
The one side of the application provides such a projection lens, the projection lens along optical axis by image source side into
Image side sequentially includes：The first lens with positive light coke；And the second lens with positive light coke.Wherein, the first lens
Can be the lens of glass material with least one lens in the second lens；And total effective focal length f and second of projection lens
The effective focal length f2 of lens can meet 1 ＜ f/f2 ＜ 1.5.
In one embodiment, the image source side surface of the first lens can be convex surface, and image side surfaces can be concave surface；Second
The image source side surface of lens can be concave surface, and image side surfaces can be convex surface.
In one embodiment, it is less in the thermal coefficient of expansion of the thermal coefficient of expansion of the first lens and the second lens
Value TCEMINTCE can be metMIN＜ 15 × 10-6/℃。
In one embodiment, the maximum angle of half field-of view HFOV of projection lens can meet 0 ＜ TAN (HFOV) ＜ 0.35.
In one embodiment, in 800nm to 1000nm light-wave band, the light penetration of projection lens can be big
In 85%.
In one embodiment, the first lens in the center thickness CT1 on optical axis and the second lens on optical axis
Heart thickness CT2 can meet 0.6 ＜ CT1/CT2 ＜ 1.2.
In one embodiment, the first lens in the center thickness CT1 on optical axis, the second lens in the center on optical axis
The optics total length TTL of thickness CT2 and projection lens can meet 0.4 ＜ (CT1+CT2)/TTL ＜ 0.8.
In one embodiment, the lens of radius of curvature R 1 and second of the image source side surface of the first lens into image side table
The radius of curvature R 4 in face can meet -1.2 ＜ R1/R4 ＜ -0.8.
In one embodiment, the effective half bore DT11 and the second lens of the image source side surface of the first lens imaging
Effective half bore DT22 of side surface can meet 0.7 ＜ DT11/DT22 ＜ 1.
In one embodiment, the effective focal length f1 and the second lens of total effective focal length f of projection lens, the first lens
Effective focal length f2 can meet 0.5 ＜ f/ (f1+f2) ＜ 0.8.
The one side of the application provides such a projection lens, the projection lens along optical axis by image source side into
Image side sequentially includes：The first lens with positive light coke；And the second lens with positive light coke.Wherein, the first lens
Can be the lens of glass material with least one lens in the second lens；And total effective focal length f, first saturating of projection lens
The effective focal length f1 of the mirror and effective focal length f2 of the second lens can meet 0.5 ＜ f/ (f1+f2) ＜ 0.8.
The one side of the application provides such a projection lens, the projection lens along optical axis by image source side into
Image side sequentially includes：The first lens with positive light coke；And the second lens with positive light coke.Wherein, the first lens
Can be the lens of glass material with least one lens in the second lens；And first lens image source side surface effectively half
Effective half bore DT22 of the image side surfaces of bore DT11 and the second lens can meet 0.7 ＜ DT11/DT22 ＜ 1.
The application employs multi-disc (for example, two panels) lens, each by reasonable selection lens material and reasonable distribution
Spacing etc. on axle between the focal power of mirror, face type, the center thickness of each lens and each lens so that above-mentioned projection lens tool
There are at least one beneficial effects such as high-performance, miniaturization, Low Drift Temperature, high image quality, and above-mentioned projection lens can be with optics
Diffraction element (DOE) is used cooperatively.
Brief description of the drawings
With reference to accompanying drawing, by the detailed description of following non-limiting embodiment, other features of the application, purpose and excellent
Point will be apparent.In the accompanying drawings：
Fig. 1 shows the structural representation of the projection lens according to the embodiment of the present application 1；
Fig. 2 shows the distortion curve of the projection lens of embodiment 1；
Fig. 3 shows the structural representation of the projection lens according to the embodiment of the present application 2；
Fig. 4 shows the distortion curve of the projection lens of embodiment 2；
Fig. 5 shows the structural representation of the projection lens according to the embodiment of the present application 3；
Fig. 6 shows the distortion curve of the projection lens of embodiment 3；
Fig. 7 shows the structural representation of the projection lens according to the embodiment of the present application 4；
Fig. 8 shows the distortion curve of the projection lens of embodiment 4；
Fig. 9 shows the structural representation of the projection lens according to the embodiment of the present application 5；
Figure 10 shows the distortion curve of the projection lens of embodiment 5；
Figure 11 shows the schematic diagram being used cooperatively according to the projection lens of the application with diffraction element.
Embodiment
In order to more fully understand the application, refer to the attached drawing is made into more detailed description to the various aspects of the application.Should
Understand, these describe the description of the simply illustrative embodiments to the application in detail, rather than limit the application in any way
Scope.In the specification, identical reference numbers identical element.Stating "and/or" includes associated institute
Any and all combinations of one or more of list of items.
It should be noted that in this manual, the statement of first, second grade is only used for a feature and another feature differentiation
Come, and do not indicate that any restrictions to feature.Therefore, it is discussed below in the case of without departing substantially from teachings of the present application
First lens are also known as the second lens, and the second lens are also known as the first lens.
In the accompanying drawings, for convenience of description, thickness, the size and dimension of lens are somewhat exaggerated.Specifically, accompanying drawing
Shown in sphere or aspherical shape be illustrated by way of example.That is, sphere or aspherical shape is not limited to accompanying drawing
In the sphere that shows or aspherical shape.Accompanying drawing is merely illustrative and and non-critical drawn to scale.
Herein, near axis area refers to the region near optical axis.If lens surface is convex surface and does not define the convex surface position
When putting, then it represents that the lens surface is extremely convex surface less than near axis area；If lens surface is concave surface and does not define the concave surface position
When, then it represents that the lens surface is extremely concave surface less than near axis area.It is referred to as image source near the surface of image source side in each lens
Side surface, it is referred to as image side surfaces near the surface into image side in each lens.
It will also be appreciated that term " comprising ", " including ", " having ", "comprising" and/or " including ", when in this theory
Represent stated feature, element and/or part be present when being used in bright book, but do not preclude the presence or addition of one or more
Further feature, element, part and/or combinations thereof.In addition, ought the statement of such as " ... at least one " appear in institute
When after the list of row feature, whole listed feature, rather than the individual component in modification list are modified.In addition, work as description originally
During the embodiment of application, represented " one or more embodiments of the application " using "available".Also, term " exemplary "
It is intended to refer to example or illustration.
Unless otherwise defined, otherwise all terms (including technical terms and scientific words) used herein be respectively provided with
The application one skilled in the art's is generally understood that identical implication.It will also be appreciated that term (such as in everyday words
Term defined in allusion quotation) implication consistent with their implications in the context of correlation technique should be interpreted as having, and
It will not explained with idealization or excessively formal sense, unless clearly so limiting herein.
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.Describe the application in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
The feature of the application, principle and other aspects are described in detail below.
It may include that such as two panels has the lens of focal power according to the projection lens of the application illustrative embodiments, i.e.
First lens and the second lens.This two panels lens is along optical axis by image source side extremely into image side sequential.
In the exemplary embodiment, the first lens can have positive light coke, and the second lens can have positive light coke.Rationally
Each power of lens and face type are distributed, is advantageous to improve the performance of projection lens；Meanwhile be advantageous to reduce camera lens overall length, protect
Demonstrate,prove the miniaturization of camera lens.
In the exemplary embodiment, the image source side surface of the first lens can be convex surface, and image side surfaces can be concave surface；The
The image source side surface of two lens can be concave surface, and image side surfaces can be convex surface.The face type of reasonable distribution and lens, is advantageously implemented
The effect of camera lens high-performance, hyposensitivity.
In the exemplary embodiment, the projection lens of the application can meet conditional TCEMIN＜ 15 × 10-6/ DEG C, its
In, TCEMINThermal coefficient of expansion for the first lens and less value in the thermal coefficient of expansion of the second lens.More specifically, TCEMIN
0.00 × 10 can further be met-6/℃≤TCEMIN≤9.50×10-6/℃.It is at least one in first lens and the second lens
Lens are the lens of glass material.The lens of glass material are rationally used, advantageously reduce temperature drift.
In the exemplary embodiment, the projection lens of the application can meet conditional 0 ＜ TAN (HFOV) ＜ 0.35, its
In, HFOV is the maximum angle of half field-of view of projection lens.More specifically, HFOV can further meet 0.1 ＜ TAN (HFOV) ＜ 0.2,
For example, 0.15≤TAN (HFOV)≤0.16.Advantageously reducing size of the image source in image side influences, and lifts the optics of projection lens
Performance.
In the exemplary embodiment, the projection lens of the application can meet the ＜ CT1/CT2 ＜ 1.2 of conditional 0.6, its
In, CT1 be the first lens in the center thickness on optical axis, CT2 is the second lens in the center thickness on optical axis.More specifically,
CT1 and CT2 can further meet 0.61≤CT1/CT2≤1.06.The center thickness of the lens of reasonable distribution first and the second lens,
Advantageously ensure that camera lens has shorter overall length, realize small size performance.
In the exemplary embodiment, the projection lens of the application can meet the ＜ of conditional 0.4 (CT1+CT2)/TTL ＜
0.8, wherein, CT1 be the first lens in the center thickness on optical axis, CT2 is the second lens in the center thickness on optical axis, TTL
For the optics total length (that is, the distance from image source to the center of the image side surfaces of the second lens on optical axis) of projection lens.
More specifically, CT1, CT2 and TTL can further meet 0.50≤(CT1+CT2)/TTL≤0.76.Meet the ＜ of conditional 0.4
(CT1+CT2)/TTL ＜ 0.8, it is advantageously implemented miniaturization effect of camera lens.
In the exemplary embodiment, the projection lens of the application can meet the ＜ R1/R4 of conditional -1.2 ＜ -0.8, its
In, R1 is the radius of curvature of the image source side surface of the first lens, and R4 is the radius of curvature of the image side surfaces of the second lens.More
Body, R1 and R4 can further meet -1.15≤R1/R4≤- 0.82.The curvature of the lens of reasonable distribution first and the second lens half
Footpath, advantageously reduce the sensitiveness of camera lens.
In the exemplary embodiment, the projection lens of the application can meet the ＜ DT11/DT22 ＜ 1 of conditional 0.7, its
In, DT11 is effective half bore of the image source side surface of the first lens, and DT22 is effectively the half of the image side surfaces of the second lens
Bore.More specifically, DT11 and DT22 can further meet 0.7 ＜ DT11/DT22 ＜ 0.9, for example, 0.78≤DT11/DT22
≤0.83.Meet the ＜ DT11/DT22 ＜ 1 of conditional 0.7, advantageously reducing size of the image source in image side influences, and lifts projection lens
The optical property of head.Reasonable distribution DT11 and DT22 also help avoid due to light overflexing and caused by image quality
Decline.
In the exemplary embodiment, the projection lens of the application in about 800nm into about 1000nm light-wave band, light
Line transmitance is more than 85%.It is such to be provided with beneficial to transmitance of the near infrared light through projection lens is improved, so as to obtain
The near-infrared projected image of more high brightness.
In the exemplary embodiment, the projection lens of the application can meet the ＜ f/f2 ＜ 1.5 of conditional 1, wherein, f is
Total effective focal length of projection lens, f2 are the effective focal length of the second lens.More specifically, f and f2 can further meet 1.11≤
f/f2≤1.48.The power of lens of reasonable distribution second, advantageously reduces temperature drift, lifts the optical property of camera lens.
In the exemplary embodiment, the projection lens of the application can meet conditional 0.5 ＜ f/ (f1+f2) ＜ 0.8, its
In, f is total effective focal length of projection lens, and f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.More
Body, f, f1 and f2 can further meet 0.55≤f/ (f1+f2)≤0.66.The light of the lens of reasonable distribution first and the second lens
Focal power, it is advantageously implemented the high-performance of camera lens.
In the exemplary embodiment, above-mentioned projection lens may also include at least one diaphragm, to lift the imaging of camera lens
Quality.Diaphragm can be arranged as required to locate at an arbitrary position, for example, diaphragm may be provided at the second lens and between image side.
Alternatively, above-mentioned projection lens may also include other known optical projection elements, for example, prism, field lens etc..Phase
Than being in common lens, the projection lens main distinction, the light of general pick-up lens forms a picture from thing side into image side
Face；And the light of general projection lens is from image source side into image side, by image planes enlarging projection until perspective plane.General projection lens
Light-inletting quantity controlled by object-side numerical aperture and camera lens diaphragm.It can be used according to the projection lens of the above-mentioned embodiment of the application
Such as two panels lens, by the materials of Rational choice lens and each power of lens of reasonable distribution, face type, each lens center
Spacing etc. on axle between thickness and each lens so that projection lens has high-performance, miniaturization, Low Drift Temperature, high imaging product
The beneficial effects such as matter.
Depth finding field can be applied to as speckle projection camera lens according to the projection lens of the application.As shown in figure 11,
When the projection lens using the application carries out depth finding to the target object in space, by infra-red laser diode (LD) or
The light that vertical cavity surface emitting laser (VCSEL) is sent can first pass through the amplification of projection lens spot, then by optical diffraction member
Part (DOE), and backward target object direction projects away.Projected light beam is after diffractive-optical element (DOE), it is possible to achieve
Redistribution of the projected image on target object.Thereafter, caught and projected by any known pick-up lens (not shown)
Image information on target object, you can calculate the 3-D view with target object location depth information.According to the application
Projection lens can be used in conjunction with each other with diffractive-optical element (DOE), so as to accurately realizing projected light beam in target object
On redistribution.
In presently filed embodiment, at least one in the minute surface of each lens is aspherical mirror.Non-spherical lens
The characteristics of be：From lens centre to lens perimeter, curvature is consecutive variations.It is constant with having from lens centre to lens perimeter
The spherical lens of curvature is different, and non-spherical lens has more preferably radius of curvature characteristic, and there is improvement to distort aberration and improve picture
The advantages of dissipating aberration.After non-spherical lens, the aberration occurred when imaging can be eliminated as much as possible, so as to improve
Image quality.
However, it will be understood by those of skill in the art that without departing from this application claims technical scheme situation
Under, the lens numbers for forming projection lens can be changed, to obtain each result and advantage described in this specification.Though for example,
So it is described in embodiments by taking two panels lens as an example, but the projection lens is not limited to include two panels lens.If
Need, the projection lens may also include the lens of other quantity.
The specific embodiment for the projection lens for being applicable to above-mentioned embodiment is further described with reference to the accompanying drawings.
Embodiment 1
Projection lens referring to Fig. 1 to Fig. 2 descriptions according to the embodiment of the present application 1.Fig. 1 shows real according to the application
Apply the structural representation of the projection lens of example 1.
As shown in figure 1, according to the projection lens of the application illustrative embodiments along optical axis by image source side into image side according to
Sequence includes：First lens E1, the second lens E2 and diaphragm STO.
First lens E1 has positive light coke, and its image source side surface S1 is convex surface, and image side surfaces S2 is concave surface.Second is saturating
Mirror E2 has positive light coke, and its image source side surface S3 is concave surface, and image side surfaces S4 is convex surface.In about 800nm to about 1000nm
In light-wave band, the light penetration of the projection lens is more than 85%.Light from image source sequentially passes through each surface S1 to S4 simultaneously
It is ultimately imaged the (not shown) on the perspective plane of such as projection screen.
Table 1 shows surface type, radius of curvature, thickness, material and the circular cone of each lens of the projection lens of embodiment 1
Coefficient, wherein, the unit of radius of curvature and thickness is millimeter (mm).
Table 1
As shown in Table 1, the first lens E1 image source side surface S1 and image side surfaces S2 and the second lens E2 image source
Side surface S3 and image side surfaces S4 is aspherical.In the present embodiment, the face type x of each non-spherical lens is available but unlimited
It is defined in following aspherical formula：
Wherein, x be it is aspherical along optical axis direction when being highly h position, away from aspheric vertex of surface apart from rise；C is
Aspherical paraxial curvature, c=1/R (that is, paraxial curvature c is the mean curvature radius R of upper table 1 inverse)；K be circular cone coefficient (
Provided in table 1)；Ai is the correction factor of aspherical i-th-th ranks.Table 2 below is given available for each aspherical in embodiment 1
Minute surface S1-S4 high order term coefficient A4、A6、A8、A10、A12、A14And A16。
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 6.6779E-02 | -2.1533E-01 | 6.7938E-01 | -3.4057E+00 | 6.8954E+00 | -3.9692E+00 | -4.5296E+00 |
| S2 | 6.7146E-01 | -6.3408E-01 | 2.5150E+01 | -1.3173E+02 | 6.3999E+01 | 2.8529E+03 | -8.0409E+03 |
| S3 | -6.6496E-02 | -1.0255E-01 | 1.5182E+00 | -1.6356E+01 | 8.5757E+01 | -2.2034E+02 | 2.3336E+02 |
| S4 | 2.1740E-02 | 2.1568E-02 | 8.1556E-04 | 7.4412E-04 | 1.1502E-01 | -1.5533E-01 | 1.1233E-01 |
Table 2
Table 3 provides effective focal length f1 and f2, the projection lens of total effective focal length f of projection lens, each lens in embodiment 1
Optics total length TTL (that is, the distance from image source OBJ to the second lens E2 image side surfaces S4 center on optical axis),
Maximum the angle of half field-of view HFOV and projection lens of projection lens object-side numerical aperture NA.
| Parameter | f(mm) | f1(mm) | f2(mm) | TTL(mm) | HFOV(°) | NA |
| Numerical value | 3.39 | 3.37 | 2.77 | 3.45 | 8.4 | 0.20 |
Table 3
Projection lens in embodiment 1 meets：
TAN (HFOV)=0.15, wherein, HFOV is the maximum angle of half field-of view of projection lens；
CT1/CT2=0.61, wherein, CT1 be the first lens E1 in the center thickness on optical axis, CT2 is the second lens E2
In the center thickness on optical axis；
(CT1+CT2)/TTL=0.50, wherein, CT1 is the first lens E1 in the center thickness on optical axis, CT2 second
For lens E2 in the center thickness on optical axis, TTL is the optics total length of projection lens；
R1/R4=-0.83, wherein, R1 is the first lens E1 image source side surface S1 radius of curvature, and R4 is the second lens
E2 image side surfaces S4 radius of curvature；
DT11/DT22=0.80, wherein, DT11 be the first lens E1 image source side surface S1 effective half bore, DT22
For the second lens E2 image side surfaces S4 effective half bore；
F/f2=1.22, wherein, f is total effective focal length of projection lens, and f2 is the second lens E2 effective focal length；
F/ (f1+f2)=0.55, wherein, f is total effective focal length of projection lens, and f1 is the first lens E1 effective Jiao
Away from f2 is the second lens E2 effective focal length；
TCEMIN=0.00 × 10-6/ DEG C, wherein, TCEMINThermal coefficient of expansion and the second lens E2 for the first lens E1
Less value in thermal coefficient of expansion.
Fig. 2 shows the distortion curve of the projection lens of embodiment 1, and it represents the distortion size in the case of different visual angles
Value.It can be seen from Fig. 2, the projection lens given by embodiment 1 can realize good image quality.
Embodiment 2
Projection lens referring to Fig. 3 to Fig. 4 descriptions according to the embodiment of the present application 2.In the present embodiment and following implementation
In example, for brevity, by clipped description similar to Example 1.Fig. 3 shows the throwing according to the embodiment of the present application 2
The structural representation of shadow camera lens.
As shown in figure 3, according to the projection lens of the application illustrative embodiments along optical axis by image source side into image side according to
Sequence includes：First lens E1, the second lens E2 and diaphragm STO.
First lens E1 has positive light coke, and its image source side surface S1 is convex surface, and image side surfaces S2 is concave surface.Second is saturating
Mirror E2 has positive light coke, and its image source side surface S3 is concave surface, and image side surfaces S4 is convex surface.In about 800nm to about 1000nm
In light-wave band, the light penetration of the projection lens is more than 85%.Light from image source sequentially passes through each surface S1 to S4 simultaneously
It is ultimately imaged the (not shown) on the perspective plane of such as projection screen.
Table 4 shows surface type, radius of curvature, thickness, material and the circular cone of each lens of the projection lens of embodiment 2
Coefficient, wherein, the unit of radius of curvature and thickness is millimeter (mm).
Table 4
As shown in Table 4, in example 2, the first lens E1 image source side surface S1 and image side surfaces S2 and second
Lens E2 image source side surface S3 and image side surfaces S4 is aspherical.Table 5 is shown available for each aspherical in embodiment 2
The high order term coefficient of minute surface, wherein, each aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -6.6061E-02 | 1.0707E-01 | -5.2668E+00 | 3.3949E+01 | -1.2315E+02 | 2.2354E+02 | -1.6954E+02 |
| S2 | 6.4678E-01 | -3.7800E+00 | 1.1027E+02 | -1.6006E+03 | 1.2745E+04 | -5.2495E+04 | 8.7013E+04 |
| S3 | -4.7767E-02 | -2.3954E-01 | 3.9808E-01 | -1.7446E+01 | 1.4517E+02 | -7.7484E+02 | 6.7842E+01 |
| S4 | -2.8044E-03 | 1.5669E-03 | -3.8248E-02 | 1.3579E-01 | -2.9681E-01 | 3.1658E-01 | -1.3674E-01 |
Table 5
Table 6 provides effective focal length f1 and f2, the projection lens of total effective focal length f of projection lens, each lens in embodiment 2
Optics total length TTL, projection lens maximum angle of half field-of view HFOV and projection lens object-side numerical aperture NA.
| Parameter | f(mm) | f1(mm) | f2(mm) | TTL(mm) | HFOV(°) | NA |
| Numerical value | 3.13 | 2.41 | 2.81 | 3.45 | 9.1 | 0.20 |
Table 6
Fig. 4 shows the distortion curve of the projection lens of embodiment 2, and it represents the distortion size in the case of different visual angles
Value.It can be seen from Fig. 4, the projection lens given by embodiment 2 can realize good image quality.
Embodiment 3
The projection lens according to the embodiment of the present application 3 is described referring to Fig. 5 to Fig. 6.Fig. 5 is shown according to the application
The structural representation of the projection lens of embodiment 3.
As shown in figure 5, according to the projection lens of the application illustrative embodiments along optical axis by image source side into image side according to
Sequence includes：First lens E1, the second lens E2 and diaphragm STO.
First lens E1 has positive light coke, and its image source side surface S1 is convex surface, and image side surfaces S2 is concave surface.Second is saturating
Mirror E2 has positive light coke, and its image source side surface S3 is concave surface, and image side surfaces S4 is convex surface.In about 800nm to about 1000nm
In light-wave band, the light penetration of the projection lens is more than 85%.Light from image source sequentially passes through each surface S1 to S4 simultaneously
It is ultimately imaged the (not shown) on the perspective plane of such as projection screen.
Table 7 shows surface type, radius of curvature, thickness, material and the circular cone of each lens of the projection lens of embodiment 3
Coefficient, wherein, the unit of radius of curvature and thickness is millimeter (mm).
Table 7
As shown in Table 7, in embodiment 3, the first lens E1 image source side surface S1 and image side surfaces S2 and second
Lens E2 image source side surface S3 and image side surfaces S4 is aspherical.Table 8 is shown available for each aspherical in embodiment 3
The high order term coefficient of minute surface, wherein, each aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -5.4910E-02 | 7.1496E-03 | -4.8775E-01 | 4.6674E-01 | 2.2280E+00 | -7.8840E+00 | 6.5804E+00 |
| S2 | 5.7693E-01 | 7.5933E-01 | 1.7444E+01 | -1.9770E+02 | 1.6471E+03 | -4.8654E+03 | 2.1756E+03 |
| S3 | 1.7187E-03 | 1.8159E-01 | 5.0055E-01 | -1.0146E+00 | 2.9928E+01 | -9.7953E+01 | 3.1718E+02 |
| S4 | 2.3711E-02 | 1.8801E-02 | 6.6387E-02 | -1.7402E-01 | 4.7586E-01 | -4.8873E-01 | 2.6749E-01 |
Table 8
Table 9 provides effective focal length f1 and f2, the projection lens of total effective focal length f of projection lens, each lens in embodiment 3
Optics total length TTL, projection lens maximum angle of half field-of view HFOV and projection lens object-side numerical aperture NA.
| Parameter | f(mm) | f1(mm) | f2(mm) | TTL(mm) | HFOV(°) | NA |
| Numerical value | 3.20 | 2.87 | 2.17 | 3.45 | 8.9 | 0.20 |
Table 9
Fig. 6 shows the distortion curve of the projection lens of embodiment 3, and it represents the distortion size in the case of different visual angles
Value.It can be seen from Fig. 6, the projection lens given by embodiment 3 can realize good image quality.
Embodiment 4
The projection lens according to the embodiment of the present application 4 is described referring to Fig. 7 to Fig. 8.Fig. 7 is shown according to the application
The structural representation of the projection lens of embodiment 4.
As shown in fig. 7, according to the projection lens of the application illustrative embodiments along optical axis by image source side into image side according to
Sequence includes：First lens E1, the second lens E2 and diaphragm STO.
First lens E1 has positive light coke, and its image source side surface S1 is convex surface, and image side surfaces S2 is concave surface.Second is saturating
Mirror E2 has positive light coke, and its image source side surface S3 is concave surface, and image side surfaces S4 is convex surface.In about 800nm to about 1000nm
In light-wave band, the light penetration of the projection lens is more than 85%.Light from image source sequentially passes through each surface S1 to S4 simultaneously
It is ultimately imaged the (not shown) on the perspective plane of such as projection screen.
Table 10 shows surface type, radius of curvature, thickness, material and the circle of each lens of the projection lens of embodiment 4
Coefficient is bored, wherein, the unit of radius of curvature and thickness is millimeter (mm).
Table 10
As shown in Table 10, in example 4, the first lens E1 image source side surface S1 and image side surfaces S2 and second
Lens E2 image source side surface S3 and image side surfaces S4 is aspherical.Table 11 is shown available for each aspheric in embodiment 4
The high order term coefficient of face minute surface, wherein, each aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 1.1124E-01 | -4.3057E-01 | -8.1028E-01 | 9.9211E+00 | -4.6702E+01 | 9.6371E+01 | -8.1338E+01 |
| S2 | 6.5729E-01 | -9.8660E-01 | 5.9240E+01 | -6.2664E+02 | 4.4169E+03 | -1.5872E+04 | 3.2887E+04 |
| S3 | 1.1759E-01 | -3.0969E-01 | 2.4760E+01 | -3.0982E+02 | 2.6300E+03 | -1.1458E+04 | 2.5222E+04 |
| S4 | 4.1869E-03 | -2.0027E-03 | 5.8219E-02 | -2.6558E-01 | 6.4642E-01 | -7.6412E-01 | 3.5579E-01 |
Table 11
Table 12 provides total effective focal length f of projection lens, the effective focal length f1 and f2 of each lens, projection lens in embodiment 4
The optics total length TTL of head, maximum the angle of half field-of view HFOV and projection lens of projection lens object-side numerical aperture NA.
| Parameter | f(mm) | f1(mm) | f2(mm) | TTL(mm) | HFOV(°) | NA |
| Numerical value | 3.25 | 2.88 | 2.89 | 3.45 | 9.0 | 0.20 |
Table 12
Fig. 8 shows the distortion curve of the projection lens of embodiment 4, and it represents the distortion size in the case of different visual angles
Value.It can be seen from Fig. 8, the projection lens given by embodiment 4 can realize good image quality.
Embodiment 5
The projection lens according to the embodiment of the present application 5 is described referring to Fig. 9 to Figure 10.Fig. 9 is shown according to this Shen
Please embodiment 5 projection lens structural representation.
As shown in figure 9, according to the projection lens of the application illustrative embodiments along optical axis by image source side into image side according to
Sequence includes：First lens E1, the second lens E2 and diaphragm STO.
First lens E1 has positive light coke, and its image source side surface S1 is convex surface, and image side surfaces S2 is concave surface.Second is saturating
Mirror E2 has positive light coke, and its image source side surface S3 is concave surface, and image side surfaces S4 is convex surface.In about 800nm to about 1000nm
In light-wave band, the light penetration of the projection lens is more than 85%.Light from image source sequentially passes through each surface S1 to S4 simultaneously
It is ultimately imaged the (not shown) on the perspective plane of such as projection screen.
Table 13 shows surface type, radius of curvature, thickness, material and the circle of each lens of the projection lens of embodiment 5
Coefficient is bored, wherein, the unit of radius of curvature and thickness is millimeter (mm).
Table 13
As shown in Table 13, in embodiment 5, the first lens E1 image source side surface S1 and image side surfaces S2 and second
Lens E2 image source side surface S3 and image side surfaces S4 is aspherical.Table 14 is shown available for each aspheric in embodiment 5
The high order term coefficient of face minute surface, wherein, each aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -1.6234E-01 | 8.7888E-01 | -8.6559E+00 | 3.9419E+01 | -1.0705E+02 | 1.5614E+02 | -9.8248E+01 |
| S2 | 9.4369E-01 | 4.5172E+00 | -2.5322E+01 | 2.4299E+02 | -1.7173E+02 | 0.0000E+00 | 0.0000E+00 |
| S3 | -2.8546E+00 | 2.6308E+01 | -2.6771E+02 | 1.6990E+03 | -5.8668E+03 | 7.7236E+03 | 0.0000E+00 |
| S4 | -5.8240E-03 | -9.0683E-02 | 6.7866E-01 | -3.0133E+00 | 7.0028E+00 | -8.3009E+00 | 3.8635E+00 |
Table 14
Table 15 provides total effective focal length f of projection lens, the effective focal length f1 and f2 of each lens, projection lens in embodiment 5
The optics total length TTL of head, maximum the angle of half field-of view HFOV and projection lens of projection lens object-side numerical aperture NA.
| Parameter | f(mm) | f1(mm) | f2(mm) | TTL(mm) | HFOV(°) | NA |
| Numerical value | 3.33 | 2.48 | 2.54 | 3.50 | 9.0 | 0.20 |
Table 15
Figure 10 shows the distortion curve of the projection lens of embodiment 5, and it represents the distortion size in the case of different visual angles
Value.It can be seen from Figure 10, the projection lens given by embodiment 5 can realize good image quality.
To sum up, embodiment 1 to embodiment 5 meets the relation shown in table 16 respectively.
| Conditional embodiment | 1 | 2 | 3 | 4 | 5 |
| TAN(HFOV) | 0.15 | 0.16 | 0.16 | 0.16 | 0.16 |
| CT1/CT2 | 0.61 | 1.00 | 0.93 | 1.06 | 0.82 |
| (CT1+CT2)/TTL | 0.50 | 0.69 | 0.69 | 0.76 | 0.71 |
| R1/R4 | -0.83 | -1.15 | -1.06 | -1.01 | -0.82 |
| DT11/DT22 | 0.80 | 0.83 | 0.83 | 0.78 | 0.81 |
| f/f2 | 1.22 | 1.11 | 1.48 | 1.12 | 1.31 |
| f/(f1+f2) | 0.55 | 0.60 | 0.64 | 0.56 | 0.66 |
| TCEMIN(×10-6/℃) | 0.00 | 9.50 | 7.60 | 9.50 | 6.10 |
Table 16
Above description is only the preferred embodiment of the application and the explanation to institute's application technology principle.People in the art
Member should be appreciated that invention scope involved in the application, however it is not limited to the technology that the particular combination of above-mentioned technical characteristic forms
Scheme, while should also cover in the case where not departing from the inventive concept, carried out by above-mentioned technical characteristic or its equivalent feature
The other technical schemes for being combined and being formed.Such as features described above has similar work(with (but not limited to) disclosed herein
The technical scheme that the technical characteristic of energy is replaced mutually and formed.
Claims (12)
1. projection lens, it is characterised in that extremely sequentially included into image side by image source side along optical axis：
The first lens with positive light coke；
The second lens with positive light coke；
At least one lens in first lens and second lens are the lens of glass material；And
Total effective focal length f of the projection lens meets 1 ＜ f/f2 ＜ 1.5 with the effective focal length f2 of second lens.
2. projection lens according to claim 1, it is characterised in that the image source side surface of first lens is convex surface,
Image side surfaces are concave surface.
3. projection lens according to claim 1, it is characterised in that the image source side surface of second lens is concave surface,
Image side surfaces are convex surface.
4. projection lens according to claim 1, it is characterised in that the thermal coefficient of expansion of first lens and described
Less value TCE in the thermal coefficient of expansion of two lensMINMeet TCEMIN＜ 15 × 10-6/℃。
5. projection lens according to claim 1, it is characterised in that the maximum angle of half field-of view HFOV of the projection lens expires
0 ＜ TAN (HFOV) ＜ 0.35 of foot.
6. projection lens according to claim 1, it is characterised in that described in 800nm to 1000nm light-wave band
The light penetration of projection lens is more than 85%.
7. projection lens according to any one of claim 1 to 6, it is characterised in that first lens are in the light
Center thickness CT1 on axle meets 0.6 ＜ CT1/CT2 ＜ with second lens in the center thickness CT2 on the optical axis
1.2。
8. projection lens according to any one of claim 1 to 6, it is characterised in that first lens are in the light
Center thickness CT1, second lens on axle is total in the optics of center thickness CT2 and the projection lens on the optical axis
Length TTL meets 0.4 ＜ (CT1+CT2)/TTL ＜ 0.8.
9. projection lens according to any one of claim 1 to 6, it is characterised in that the image source side of first lens
The radius of curvature R 1 on surface and the radius of curvature R 4 of the image side surfaces of second lens meet -1.2 ＜ R1/R4 ＜ -0.8.
10. projection lens according to any one of claim 1 to 6, it is characterised in that the image source side of first lens
Effective half bore DT11 on surface and the image side surfaces of second lens effective half bore DT22 meet 0.7 ＜ DT11/
DT22 ＜ 1.
11. projection lens according to any one of claim 1 to 6, it is characterised in that the projection lens it is total effectively
Focal length f, the effective focal length f1 of first lens and the effective focal length f2 of second lens meet 0.5 ＜ f/ (f1+f2) ＜
0.8。
12. projection lens, it is characterised in that extremely sequentially included into image side by image source side along optical axis：
The first lens with positive light coke；
The second lens with positive light coke；
At least one lens in first lens and second lens are the lens of glass material；And
Total effective focal length f of the projection lens, the effective focal length f1 of first lens and second lens effective Jiao
Meet 0.5 ＜ f/ (f1+f2) ＜ 0.8 away from f2.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711375247.1A CN107861317B (en) | 2017-12-19 | 2017-12-19 | Projection lens |
| PCT/CN2018/088685 WO2019119728A1 (en) | 2017-12-19 | 2018-05-28 | Projection lens |
| US16/293,103 US11143843B2 (en) | 2017-12-19 | 2019-03-05 | Projection lens assembly |
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|---|---|---|---|
| CN201711375247.1A CN107861317B (en) | 2017-12-19 | 2017-12-19 | Projection lens |
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| CN107861317A true CN107861317A (en) | 2018-03-30 |
| CN107861317B CN107861317B (en) | 2019-10-18 |
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| EP3640667A1 (en) * | 2018-10-18 | 2020-04-22 | Sick Ag | Optoelectronic sensor and method for detecting objects |
| WO2020119279A1 (en) * | 2018-12-11 | 2020-06-18 | 江西联益光学有限公司 | Collimating lens and projection module |
| CN112747691A (en) * | 2020-03-19 | 2021-05-04 | 熵智科技(深圳)有限公司 | Large-view single-texture active projection module and 3D camera |
| CN113204001A (en) * | 2020-01-30 | 2021-08-03 | 西克股份公司 | Photoelectric sensor and method for detecting object |
| CN114967060A (en) * | 2022-06-15 | 2022-08-30 | 安徽光智科技有限公司 | Small-size poor infrared camera lens that disappears |
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