CN107861317B - Projection lens - Google Patents
Projection lens Download PDFInfo
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- CN107861317B CN107861317B CN201711375247.1A CN201711375247A CN107861317B CN 107861317 B CN107861317 B CN 107861317B CN 201711375247 A CN201711375247 A CN 201711375247A CN 107861317 B CN107861317 B CN 107861317B
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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
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- 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
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- General Physics & Mathematics (AREA)
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Abstract
This application discloses a kind of projection lens, which extremely sequentially includes: the first lens with positive light coke at image side by image source side along optical axis；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 effective focal length f of projection lens and the effective focal length f2 of the second lens meet 1 < f/f2 < 1.5.
Description
Technical field
This application involves a kind of projection lens, more specifically, this application involves a kind of projection lens including two panels lens.
Background technique
In recent years, with the continuous progress of science and technology, three dimensional depth application is gradually risen, and the application range of projection lens is also more next
It is wider.Nowadays, chip technology is quickly grown with intelligent algorithm, is projected image to space object using optical projection lens and is received
The picture signal can calculate the 3-D image with object space depth information.3-D image 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, various aberrations usually are eliminated simultaneously by using the mode for increasing lens numbers
Improve resolution ratio.But increase lens numbers and will lead to the optics total length increase of projection lens, to be unfavorable for realizing camera lens
Miniaturization.In addition, general big field angle projection lens 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).
Summary of the invention
This application provides be applicable to portable electronic product, can at least solve or part solve it is in the prior art
The projection lens of at least one above-mentioned disadvantage.
The one aspect of the application provides such a projection lens, the projection lens along optical axis by image source side at
Image side sequentially includes: the first lens with positive light coke；And the second lens with positive light coke.Wherein, the first lens
It can be the lens of glass material at 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, lesser in the thermal expansion coefficient of the thermal expansion coefficient 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 the light-wave band of 800nm to 1000nm, the light penetration of projection lens can be big
In 85%.
In one embodiment, the first lens on optical axis center thickness CT1 and the second lens on optical axis
Heart thickness CT2 can meet 0.6 < CT1/CT2 < 1.2.
In one embodiment, the first lens on optical axis center thickness CT1, the second lens are 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 radius of curvature R 1 of the image source side surface of the first lens and the second lens at image side table
The radius of curvature R 4 in face can meet -1.2 < R1/R4 < -0.8.
In one embodiment, the imaging of the effective half bore DT11 and the second lens of the image source side surface of the first lens
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 aspect of the application provides such a projection lens, the projection lens along optical axis by image source side at
Image side sequentially includes: the first lens with positive light coke；And the second lens with positive light coke.Wherein, the first lens
It can be the lens of glass material at least one lens in the second lens；And projection lens total effective focal length f, first thoroughly
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 aspect of the application provides such a projection lens, the projection lens along optical axis by image source side at
Image side sequentially includes: the first lens with positive light coke；And the second lens with positive light coke.Wherein, the first lens
It can be the lens of glass material at 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 uses multi-disc (for example, two panels) lens, each by reasonable selection lens material and reasonable distribution
The focal power of mirror, face type, each lens center thickness and each lens between axis on spacing etc. so that above-mentioned projection lens has
There is at least one beneficial effect 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.
Detailed description of the invention
In conjunction with attached 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 schematic diagram of the projection lens according to the embodiment of the present application 1；
Fig. 2 shows the distortion curves of the projection lens of embodiment 1；
Fig. 3 shows the structural schematic diagram 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 schematic diagram 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 schematic diagram 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 schematic diagram 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 and diffraction element of the application.
Specific embodiment
Various aspects of the reference attached drawing to the application are made more detailed description by the application in order to better understand.It answers
Understand, the only description to the illustrative embodiments of the application is described in detail in these, rather than limits the application in any way
Range.In the specification, the identical element of identical reference numbers.Stating "and/or" includes associated institute
Any and all combinations of one or more of list of items.
It should be noted that in the present specification, the first, second equal statement is only used for a feature and another feature differentiation
It comes, without indicating any restrictions to feature.Therefore, discussed below 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 ease of description, thickness, the size and shape of lens are slightly exaggerated.Specifically, attached drawing
Shown in spherical surface or aspherical shape be illustrated by way of example.That is, spherical surface or aspherical shape are not limited to attached drawing
Shown in spherical surface or aspherical shape.Attached 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 convex surface position
When setting, then it represents that the lens surface is convex surface near axis area is less than；If lens surface is concave surface and does not define the concave surface position
When, then it represents that the lens surface is concave surface near axis area is less than.Surface in each lens near image source side is known as image source
Side surface is known as image side surfaces near at the surface of image side in each lens.
It will also be appreciated that term " comprising ", " including ", " having ", "comprising" and/or " including ", when in this theory
It indicates there is stated feature, element and/or component when using in bright book, but does not preclude the presence or addition of one or more
Other feature, component, assembly unit and/or their combination.In addition, ought the statement of such as at least one of " ... " appear in institute
When after the list of column feature, entire listed feature is modified, rather than modifies the individual component in list.In addition, when describing this
When the embodiment of application, " one or more embodiments of the application " are indicated using "available".Also, term " illustrative "
It is intended to refer to example or illustration.
Unless otherwise defined, otherwise all terms (including technical terms and scientific words) used herein all have with
The application one skilled in the art's is generally understood identical meaning.It will also be appreciated that term (such as in everyday words
Term defined in allusion quotation) it should be interpreted as having and their consistent meanings of meaning in the context of the relevant technologies, and
It will not be explained with idealization or excessively formal sense, unless clear herein so limit.
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The application is described 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.
Projection lens according to the application illustrative embodiments may include the lens that such as two panels has focal power, that is,
First lens and the second lens.This two panels lens is along optical axis by image source side at 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, the performance for improving projection lens is conducive to；Meanwhile being conducive to reduce camera lens overall length, it protects
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,
In, TCEMINFor lesser value in the thermal expansion coefficient of the first lens and the thermal expansion coefficient of the second lens.More specifically, TCEMIN
0.00 × 10 can further be met-6/℃≤TCEMIN≤9.50×10-6/℃.At least one of first lens and the second lens
Lens are the lens of glass material.The lens for rationally using glass material, advantageously reduce temperature drift.
In the exemplary embodiment, the projection lens of the application can meet conditional 0 < TAN (HFOV) < 0.35,
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 promotes the optics of projection lens
Performance.
In the exemplary embodiment, the projection lens of the application can meet 0.6 < CT1/CT2 < 1.2 of conditional,
In, CT1 is the first lens in the center thickness on optical axis, and 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 reasonable distribution the first lens and the second lens,
It advantageously ensures that camera lens has shorter overall length, realizes small size performance.
In the exemplary embodiment, the projection lens of the application can meet 0.4 < of conditional (CT1+CT2)/TTL <
0.8, wherein CT1 is the first lens in the center thickness on optical axis, and CT2 is the second lens in the center thickness on optical axis, TTL
For the optics total length (that is, the distance of the center from image source to 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 0.4 < of conditional
(CT1+CT2)/TTL < 0.8 is advantageously implemented miniaturization effect of camera lens.
In the exemplary embodiment, the projection lens of the application can meet -1.2 < -0.8 < R1/R4 of conditional,
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 first lens of reasonable distribution and the second lens half
Diameter advantageously reduces the sensibility of camera lens.
In the exemplary embodiment, the projection lens of the application can meet 0.7 < DT11/DT22 < 1 of conditional,
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 0.7 < DT11/DT22 < 1 of conditional, advantageously reducing size of the image source in image side influences, and promotes projection lens
The optical property of head.Reasonable distribution DT11 and DT22 also help avoid as light overflexing and caused by image quality
Decline.
In the exemplary embodiment, the projection lens of the application is in the light-wave band of about 800nm to about 1000nm, light
Line transmitance is greater than 85%.Such be provided with is conducive to improve the transmitance that near infrared light penetrates projection lens, to obtain
The near-infrared projected image of more high brightness.
In the exemplary embodiment, the projection lens of the application can meet 1 < f/f2 < 1.5 of conditional, 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 second power of lens of reasonable distribution, advantageously reduces temperature drift, promotes 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,
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 reasonable distribution the first lens and the second lens
Focal power 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 promote the imaging of camera lens
Quality.Diaphragm can be set as needed to be located at an arbitrary position, for example, diaphragm may be provided at the second lens and between image side.
Optionally, above-mentioned projection lens may also include other well known optical projection elements, for example, prism, field lens etc..Phase
Than in common lens, the projection lens main distinction is, the light of general pick-up lens forms a picture from object side at image side
Face；And the light of general projection lens is from image source side at 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 embodiment of the application
Such as two panels lens, pass through the center of the material and each power of lens of reasonable distribution of Rational choice lens, face type, each lens
Spacing etc. on axis 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.
It can be used as speckle projection camera lens applied to depth finding field 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) issues can first pass through the amplification of projection lens spot, using optical diffraction member
Part (DOE), and backward target object direction projects away.Projected light beam may be implemented after diffractive-optical element (DOE)
Redistribution of the projected image on target object.Thereafter, it is projected by any known pick-up lens (not shown) capture
Image information on target object can calculate the 3-D image 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), thus accurately realize projected light beam in target object
On redistribution.
In presently filed embodiment, at least one of mirror 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 solution the case where
Under, the lens numbers for constituting projection lens can be changed, to obtain each result and advantage described in this specification.Though for example,
It is so described by taking two panels lens as an example in embodiments, but the projection lens is not limited to include two panels lens.If
It needs, which may also include the lens of other quantity.
The specific embodiment for being applicable to the projection lens of above embodiment is further described with reference to the accompanying drawings.
Embodiment 1
Referring to Fig. 1 to Fig. 2 description according to the projection lens of the embodiment of the present application 1.Fig. 1 is shown according to the application reality
Apply the structural schematic diagram 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 at image side according to
Sequence includes: the first lens E1, the second lens E2 and diaphragm STO.
First lens E1 has positive light coke, and image source side surface S1 is convex surface, and image side surfaces S2 is concave surface.Second thoroughly
Mirror E2 has positive light coke, and 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 greater 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 radius of curvature and the unit of thickness are millimeter (mm).
Table 1
As shown in Table 1, the image source of the image source side surface S1 and image side surfaces S2 of the first lens E1 and the second lens E2
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 the position of h, away from aspheric vertex of surface apart from rise；C is
Aspherical paraxial curvature, c=1/R (that is, inverse that paraxial curvature c is upper 1 mean curvature radius R of table)；K be circular cone coefficient (
It has been provided in table 1)；Ai is the correction factor of aspherical i-th-th rank.The following table 2 give can be used for it is each aspherical in embodiment 1
The high-order coefficient A of mirror surface S1-S44、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 of the center from image source OBJ to the image side surfaces S4 of the second lens E2 on optical axis),
The maximum angle of half field-of view HFOV of the projection lens and object-side numerical aperture NA of projection lens.
| 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 is the first lens E1 in the center thickness on optical axis, and 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 radius of curvature of the image source side surface S1 of the first lens E1, and R4 is the second lens
The radius of curvature of the image side surfaces S4 of E2；
DT11/DT22=0.80, wherein DT11 is effective half bore of the image source side surface S1 of the first lens E1, DT22
For effective half bore of the image side surfaces S4 of the second lens E2；
F/f2=1.22, wherein f is total effective focal length of projection lens, and f2 is the effective focal length of the second lens E2；
F/ (f1+f2)=0.55, wherein f is total effective focal length of projection lens, and f1 is effective coke of the first lens E1
Away from f2 is the effective focal length of the second lens E2；
TCEMIN=0.00 × 10-6/ DEG C, wherein TCEMINFor the thermal expansion coefficient and the second lens E2 of the first lens E1
Lesser value in thermal expansion coefficient.
Fig. 2 shows the distortion curves of the projection lens of embodiment 1, indicate the distortion size in the case of different perspectives
Value.As can be seen from FIG. 2, projection lens given by embodiment 1 can be realized good image quality.
Embodiment 2
Referring to Fig. 3 to Fig. 4 description according to the projection lens of 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 schematic diagram 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 at image side according to
Sequence includes: the first lens E1, the second lens E2 and diaphragm STO.
First lens E1 has positive light coke, and image source side surface S1 is convex surface, and image side surfaces S2 is concave surface.Second thoroughly
Mirror E2 has positive light coke, and 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 greater 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 radius of curvature and the unit of thickness are millimeter (mm).
Table 4
As shown in Table 4, in example 2, the image source side surface S1 and image side surfaces S2 and second of the first lens E1
The image source side surface S3 and image side surfaces S4 of lens E2 is aspherical.Table 5 show can be used for it is each aspherical in embodiment 2
The high-order coefficient of mirror 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, the maximum angle of half field-of view HFOV of projection lens and the object-side numerical aperture NA of projection lens.
| 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, indicates the distortion size in the case of different perspectives
Value.As can be seen from FIG. 4, projection lens given by embodiment 2 can be realized 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 schematic diagram 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 at image side according to
Sequence includes: the first lens E1, the second lens E2 and diaphragm STO.
First lens E1 has positive light coke, and image source side surface S1 is convex surface, and image side surfaces S2 is concave surface.Second thoroughly
Mirror E2 has positive light coke, and 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 greater 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 radius of curvature and the unit of thickness are millimeter (mm).
Table 7
As shown in Table 7, in embodiment 3, the image source side surface S1 and image side surfaces S2 and second of the first lens E1
The image source side surface S3 and image side surfaces S4 of lens E2 is aspherical.Table 8 show can be used for it is each aspherical in embodiment 3
The high-order coefficient of mirror 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, the maximum angle of half field-of view HFOV of projection lens and the object-side numerical aperture NA of projection lens.
| 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, indicates the distortion size in the case of different perspectives
Value.As can be seen from FIG. 6, projection lens given by embodiment 3 can be realized 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 schematic diagram 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 at image side according to
Sequence includes: the first lens E1, the second lens E2 and diaphragm STO.
First lens E1 has positive light coke, and image source side surface S1 is convex surface, and image side surfaces S2 is concave surface.Second thoroughly
Mirror E2 has positive light coke, and 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 greater 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
Bore coefficient, wherein radius of curvature and the unit of thickness are millimeter (mm).
Table 10
As shown in Table 10, in example 4, the image source side surface S1 and image side surfaces S2 and second of the first lens E1
The image source side surface S3 and image side surfaces S4 of lens E2 is aspherical.Table 11, which is shown, can be used for each aspheric in embodiment 4
The high-order coefficient of face mirror 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
Optics total length TTL, the maximum angle of half field-of view HFOV of projection lens and the object-side numerical aperture NA of projection lens of head.
| 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, indicates the distortion size in the case of different perspectives
Value.As can be seen from FIG. 8, projection lens given by embodiment 4 can be realized 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 schematic diagram.
As shown in figure 9, according to the projection lens of the application illustrative embodiments along optical axis by image source side at image side according to
Sequence includes: the first lens E1, the second lens E2 and diaphragm STO.
First lens E1 has positive light coke, and image source side surface S1 is convex surface, and image side surfaces S2 is concave surface.Second thoroughly
Mirror E2 has positive light coke, and 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 greater 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
Bore coefficient, wherein radius of curvature and the unit of thickness are millimeter (mm).
Table 13
As shown in Table 13, in embodiment 5, the image source side surface S1 and image side surfaces S2 and second of the first lens E1
The image source side surface S3 and image side surfaces S4 of lens E2 is aspherical.Table 14, which is shown, can be used for each aspheric in embodiment 5
The high-order coefficient of face mirror 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
Optics total length TTL, the maximum angle of half field-of view HFOV of projection lens and the object-side numerical aperture NA of projection lens of head.
| 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, indicates the distortion size in the case of different perspectives
Value.As can be seen from FIG. 10, projection lens given by embodiment 5 can be realized good image quality.
To sum up, embodiment 1 to embodiment 5 meets relationship 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.Those skilled in the art
Member is it should be appreciated that invention scope involved in the application, however it is not limited to technology made of the specific combination of above-mentioned technical characteristic
Scheme, while should also cover in the case where not departing from the inventive concept, it is carried out by above-mentioned technical characteristic or its equivalent feature
Any combination and the other technical solutions formed.Such as features described above has similar function with (but being not limited to) disclosed herein
Can technical characteristic replaced mutually and the technical solution that is formed.
Claims (20)
1. projection lens, which is characterized in that extremely sequentially include: at 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 first lens
It is aspherical mirror at least one of the mirror surface of second lens；
Total effective focal length f of the projection lens and the effective focal length f2 of second lens meet 1 < f/f2 < 1.5；And
The radius of curvature of the image side surfaces of the radius of curvature R 1 of the image source side surface of first lens and second lens
R4 meets -1.2 < R1/R4 < -0.8.
2. projection lens according to claim 1, which is characterized 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, which is characterized 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, which is characterized in that the thermal expansion coefficient of first lens and described
Lesser value TCE in the thermal expansion coefficient of two lensMINMeet TCEMIN< 15 × 10-6/℃。
5. projection lens according to claim 1, which is characterized in that the maximum angle of half field-of view HFOV of the projection lens is full
0 < TAN (HFOV) < 0.35 of foot.
6. projection lens according to claim 1, which is characterized in that described in the light-wave band of 800nm to 1000nm
The light penetration of projection lens is greater than 85%.
7. projection lens according to any one of claim 1 to 6, which is characterized in that first lens are in the light
Center thickness CT1 and second lens on axis meet 0.6 < CT1/CT2 < in the center thickness CT2 on the optical axis
1.2。
8. projection lens according to any one of claim 1 to 6, which is characterized in that first lens are in the light
Center thickness CT1, second lens on axis on the optical axis center thickness CT2 and the optics of the projection lens it is total
Length TTL meets 0.4 < (CT1+CT2)/TTL < 0.8.
9. projection lens according to any one of claim 1 to 6, which is characterized in that the image source side of first lens
Effective half bore DT22 of the image side surfaces of effective half bore DT11 and second lens on surface meets 0.7 < DT11/
DT22 < 1.
10. projection lens according to any one of claim 1 to 6, which is characterized in that the projection lens it is total effectively
The effective focal length f2 of focal length f, the effective focal length f1 of first lens and second lens meet 0.5 < f/ (f1+f2) <
0.8。
11. projection lens, which is characterized in that extremely sequentially include: at 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 first lens
It is aspherical mirror at least one of the mirror surface of second lens；
Effective coke of total effective focal length f of the projection lens, the effective focal length f1 of first lens and second lens
Meet 0.5 < f/ (f1+f2) < 0.8 away from f2；And
The radius of curvature of the image side surfaces of the radius of curvature R 1 of the image source side surface of first lens and second lens
R4 meets -1.2 < R1/R4 < -0.8.
12. projection lens according to claim 11, which is characterized in that the image source side surface of first lens is convex
Face, image side surfaces are concave surface.
13. projection lens according to claim 12, which is characterized in that the image source side surface of second lens is recessed
Face, image side surfaces are convex surface.
14. projection lens according to claim 13, which is characterized in that first lens are in the center on the optical axis
Thickness CT1 and second lens are in the 0.6 < CT1/CT2 < 1.2 of center thickness CT2 satisfaction on the optical axis.
15. projection lens according to claim 13, which is characterized in that first lens are in the center on the optical axis
Thickness CT1, second lens are full in the optics total length TTL of center thickness CT2 and the projection lens on the optical axis
0.4 < of foot (CT1+CT2)/TTL < 0.8.
16. projection lens according to claim 13, which is characterized in that total effective focal length f of the projection lens and institute
The effective focal length f2 for stating the second lens meets 1 < f/f2 < 1.5.
17. projection lens according to claim 13, which is characterized in that the image source side surface of first lens it is effective
Effective half bore DT22 of the image side surfaces of half bore DT11 and second lens meets 0.7 < DT11/DT22 < 1.
18. projection lens described in any one of 1 to 17 according to claim 1, which is characterized in that the heat of first lens is swollen
Lesser value TCE in the thermal expansion coefficient of swollen coefficient and second lensMINMeet TCEMIN< 15 × 10-6/℃。
19. projection lens described in any one of 1 to 17 according to claim 1, which is characterized in that the maximum of the projection lens
Angle of half field-of view HFOV meets 0 < TAN (HFOV) < 0.35.
20. projection lens described in any one of 1 to 17 according to claim 1, which is characterized in that in 800nm to 1000nm's
In light-wave band, the light penetration of the projection lens is greater than 85%.
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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711375247.1A CN107861317B (en) | 2017-12-19 | 2017-12-19 | Projection lens |
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| CN107861317A CN107861317A (en) | 2018-03-30 |
| CN107861317B true CN107861317B (en) | 2019-10-18 |
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| WO2019119728A1 (en) * | 2017-12-19 | 2019-06-27 | 浙江舜宇光学有限公司 | Projection lens |
| DE102018125826A1 (en) * | 2018-10-18 | 2020-04-23 | Sick Ag | Optoelectronic sensor and method for detecting objects |
| CN109557650B (en) | 2018-12-11 | 2020-06-23 | 江西联益光学有限公司 | Collimating lens and projection module |
| DE102020102247A1 (en) * | 2020-01-30 | 2021-08-05 | Sick Ag | Optoelectronic sensor and method for detecting objects |
| CN111238400A (en) * | 2020-03-19 | 2020-06-05 | 熵智科技(深圳)有限公司 | Large-visual-field speckle structure optical camera illumination system |
| CN114967060B (en) * | 2022-06-15 | 2023-07-14 | 安徽光智科技有限公司 | Small-sized infrared lens capable of eliminating heat difference |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6295168B1 (en) * | 1999-12-15 | 2001-09-25 | International Business Machines Corporation | Refractive optical system that converts a laser beam to a collimated flat-top beam |
| TW200916873A (en) * | 2007-10-09 | 2009-04-16 | Largan Precision Co Ltd | Two-lens type lens system for taking image |
| CN101490595A (en) * | 2006-07-20 | 2009-07-22 | 株式会社尼康 | Optical system and eyepiece |
| CN107436484A (en) * | 2017-09-15 | 2017-12-05 | 江西联创电子有限公司 | Projection lens |
| CN207516712U (en) * | 2017-12-19 | 2018-06-19 | 浙江舜宇光学有限公司 | Projection lens |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09203858A (en) * | 1996-01-25 | 1997-08-05 | Olympus Optical Co Ltd | Lens for read |
-
2017
- 2017-12-19 CN CN201711375247.1A patent/CN107861317B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6295168B1 (en) * | 1999-12-15 | 2001-09-25 | International Business Machines Corporation | Refractive optical system that converts a laser beam to a collimated flat-top beam |
| CN101490595A (en) * | 2006-07-20 | 2009-07-22 | 株式会社尼康 | Optical system and eyepiece |
| TW200916873A (en) * | 2007-10-09 | 2009-04-16 | Largan Precision Co Ltd | Two-lens type lens system for taking image |
| CN107436484A (en) * | 2017-09-15 | 2017-12-05 | 江西联创电子有限公司 | Projection lens |
| CN207516712U (en) * | 2017-12-19 | 2018-06-19 | 浙江舜宇光学有限公司 | Projection lens |
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