CN106997089B - Optical mirror slip group - Google Patents

Abstract

This application discloses a kind of optical mirror slip groups, sequentially include: the first lens, the second lens, the third lens and the 4th lens from object side to image side along optical axis.First lens have positive light coke, and object side is convex surface；Second lens have negative power, and object side is concave surface；The third lens have positive light coke or negative power；4th lens have negative power.Wherein, the airspace T23 of the second lens and the third lens on optical axis and the airspace T34 of the third lens and the 4th lens on optical axis meet T23/T34 < 0.2.

Description

Optical mirror slip group

Technical field

This application involves a kind of optical mirror slip groups, more specifically, this application involves the optical mirror slips including four lens Group.

Background technique

In recent years, with the development of science and technology, the portable electronic products such as mobile phone, tablet computer gradually rise, and have The portable electronic product of camera function, which obtains people, more to be favored, therefore market is to suitable for portable electronic product The demand of pick-up lens is gradually increased.And with portable electronic product be intended to miniaturization, it is lightening, limit camera lens Overall length, to increase the design difficulty of camera lens.Meanwhile with common photosensitive element CCD (Charge-Coupled Device, photosensitive coupling element) or CMOS (Complementary Metal-Oxide Semiconductor, complementarity oxidation Metal semiconductor element) etc. the raising of element functions and the reduction of size, for the high image quality for the camera lens used that matches And more stringent requirements are proposed for miniaturization.

In order to meet the requirement of miniaturization, while realizing that camera lens takes the photograph remote effect, this requires shortening lens length Need to take into account good image quality simultaneously, to realize the longer blur-free imaging of focal length.

Therefore, it is necessary to a kind of light with long-focus, high-resolution and miniaturization for being applicable to portable electronic product Learn lens set.

Summary of the invention

Technical solution provided by the present application at least has been partially solved techniques discussed above problem.

According to the one aspect of the application, provide such a optical mirror slip group, along optical axis from object side to image side according to Sequence includes: the first lens, the second lens, the third lens and the 4th lens.First lens can have positive light coke, object side It can be convex surface；Second lens can have negative power, and object side can be concave surface；The third lens can have positive light coke or negative Focal power；4th lens can have negative power.Wherein, the airspace T23 of the second lens and the third lens on optical axis T23/T34 < 0.2 can be met between the airspace T34 on optical axis with the third lens and the 4th lens.

The application uses multi-disc (for example, four) eyeglass, passes through the light focus of each eyeglass in reasonable distribution optical mirror slip group The airspace of degree and each eyeglass of reasonable distribution on optical axis, makes the optical mirror slip group while meeting miniaturization, real Now take the photograph remote effect.

According to further aspect of the application, such a optical mirror slip group is provided, simultaneously with total effective focal length f It and along optical axis sequentially include: the first lens, the second lens, the third lens and at least one subsequent lens from object side to image side.The One lens can have positive light coke, and object side can be convex surface；Second lens can have negative power, and object side can be recessed Face；The third lens can have positive light coke or negative power.Wherein, the combination of the first lens, the second lens and the third lens Focal power is positive light coke, can meet 0.6 < f123/f < 1.0 between a combination thereof focal length f123 and total effective focal length f.

In one embodiment, at least one above-mentioned subsequent lens include the 4th lens with negative power.

In one embodiment, airspace T34 on optical axis of the third lens and the 4th lens and the 4th lens in 0.9 < T34/CT4 < 1.4 can be met between center thickness CT4 on optical axis.

In one embodiment, the first lens to the 4th lens respectively at the sum of center thickness on optical axis ∑ CT with 0.4 < ∑ CT/TTL < 0.6 can be met between distance TTL on the object side of first lens to the axis of the imaging surface of optical mirror slip group.

In one embodiment, can expire between the effective focal length f1 of the first lens and the effective focal length f2 of the second lens Foot | f1/f2 | < 1.

In one embodiment, can expire between the effective focal length f4 of the 4th lens and the effective focal length f3 of the third lens Foot | f4/f3 | < 1.

In one embodiment, the song of the object side of the radius of curvature R 2 and the second lens of the image side surface of the first lens 0 < (R2-R3)/(R2+R3)≤1.0 can be met between rate radius R3.

In one embodiment, the image side surface of the effective radius SD11 and the 4th lens of the object side of the first lens 1.0 < SD11/SD42 < 1.5 can be met between effective radius SD42.

In one embodiment, can expire between the abbe number V2 of the second lens and the abbe number V1 of the first lens Foot | V2-V1 | > 30.

In one embodiment, optical mirror slip group has maximum angle of half field-of view HFOV, and maximum angle of half field-of view HFOV HFOV≤20 ° can be met.

In one embodiment, on the object side of the first lens to the axis of the imaging surface of optical mirror slip group distance TTL with 0.8 < TTL/f < 1.05 can be met between total effective focal length f of optical mirror slip group.

Optical mirror slip group through the above configuration, can also further have it is following at least one the utility model has the advantages that

Realize the long-focus of optical mirror slip group

Improve the resolution ratio of optical mirror slip group；

The group of improved machining eyeglass and optical mirror slip group founds technique；

The sensibility of reduced optical mirror slip group；

Correct all kinds of aberrations；And

Improve the resolution and image quality of optical mirror slip group.

Detailed description of the invention

In conjunction with attached drawing, by the detailed description of following non-limiting embodiment, other features of the invention, purpose and Advantage will be apparent.In the accompanying drawings:

Fig. 1 shows the structural schematic diagram of the optical mirror slip group according to the embodiment of the present application 1；

Fig. 2A to Fig. 2 C respectively illustrates chromatic curve on the axis of the optical mirror slip group of embodiment 1, astigmatism curve and abnormal Varied curve；

Fig. 3 shows the structural schematic diagram of the optical mirror slip group according to the embodiment of the present application 2；

Fig. 4 A to Fig. 4 C respectively illustrates chromatic curve on the axis of the optical mirror slip group of embodiment 2, astigmatism curve and abnormal Varied curve；

Fig. 5 shows the structural schematic diagram of the optical mirror slip group according to the embodiment of the present application 3；

Fig. 6 A to Fig. 6 C respectively illustrates chromatic curve on the axis of the optical mirror slip group of embodiment 3, astigmatism curve and abnormal Varied curve；

Fig. 7 shows the structural schematic diagram of the optical mirror slip group according to the embodiment of the present application 4；

Fig. 8 A to Fig. 8 C respectively illustrates chromatic curve on the axis of the optical mirror slip group of embodiment 4, astigmatism curve and abnormal Varied curve；

Fig. 9 shows the structural schematic diagram of the optical mirror slip group according to the embodiment of the present application 5；

Figure 10 A to Figure 10 C respectively illustrate chromatic curve on the axis of the optical mirror slip group of embodiment 5, astigmatism curve and Distortion curve；

Figure 11 shows the structural schematic diagram of the optical mirror slip group according to the embodiment of the present application 6；

Figure 12 A to figure 12 C respectively illustrate chromatic curve on the axis of the optical mirror slip group of embodiment 6, astigmatism curve and Distortion curve.

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, first, second, third, etc. statement is only used for a feature and another spy Sign distinguishes, without indicating any restrictions to feature.Therefore, without departing substantially from teachings of the present application, hereinafter The first lens discussed are also known as the second lens or the third lens.

In the accompanying drawings, for ease of description, thickness, the size and shape of lens are slightly exaggerated.Specifically, attached Spherical surface shown in figure or aspherical shape are illustrated by way of example.That is, spherical surface or aspherical shape be not limited to it is attached Spherical surface shown in figure 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 object is known as object side Face is known as image side surface near the surface of imaging surface in each lens.

It will also be appreciated that term " comprising ", " including ", " having ", "comprising" and/or " including ", when in this theory In bright book use when indicate exist stated feature, entirety, step, operations, elements, and/or components, but do not exclude the presence of or It is attached with one or more of the other feature, entirety, step, operation, component, assembly unit and/or their combination.In addition, ought be such as When the statement of at least one of " ... " appears in after the list of listed feature, entire listed feature is modified, rather than is repaired Adorn the individual component in list.In addition, when describing presently filed embodiment, " can with " be used to indicate " one of the application Or multiple embodiments ".Also, term " illustrative " is intended to refer to example or illustration.

Unless otherwise defined, otherwise all terms (including technical terms and scientific words) used herein all have Identical meaning is generally understood with the application one skilled in the art.It will also be appreciated that term (such as normal The term defined in dictionary) 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.

Optical mirror slip group according to the application illustrative embodiments includes such as four lens with focal power, i.e., First lens, the second lens, the third lens and the 4th lens.This four lens along optical axis from object side to image side sequential.

According to the application illustrative embodiments, the first lens can have positive light coke, and object side is convex surface；Second Lens can have negative power, and object side is concave surface；The third lens can have positive light coke or negative power；And the 4th Lens can have negative power.Wherein, the first lens, the second lens, the third lens are the first lens group, a combination thereof focal power For positive light coke；4th lens are the second lens group, and a combination thereof focal power is negative power.

In the exemplary embodiment, the maximum angle of half field-of view HFOV of optical mirror slip group can meet HFOV≤20 °, more Body, HFOV can further meet 14.1 °≤HFOV≤14.2 °.

In the application, reasonable Arrangement can be carried out to the distribution of each lens strength.The effective focal length f1 of first lens and Can meet between the effective focal length f2 of two lens | f1/f2 | < 1, more specifically, f1 and f2 can further meet 0.35≤| f1/ f2|≤0.60.Can meet between the effective focal length f4 of 4th lens and the effective focal length f3 of the third lens | f4/f3 | < 1, more Body, f4 and f3 can further meet 0.00≤| f4/f3 |≤0.61.The reasonable Arrangement of each lens strength is conducive to optics The balance of lens set focal power, remote effect is taken the photograph in realization, while mitigating the susceptibility of optical mirror slip group.

In the exemplary embodiment, the combined focal length f123 and optical frames of the first lens, the second lens and the third lens 0.6 < f123/f < 1.0 can be met between total effective focal length f of piece group, more specifically, f123 and f can further meet 0.79≤ f123/f≤0.80.The reasonable distribution of focal power is, it can be achieved that optical mirror slip group takes the photograph remote effect.

In the application, can also the spacing distance of center thickness and each lens to each lens optimize.For example, the Three lens and the 4th lens on optical axis airspace T34 and the 4th lens can expire between the center thickness CT4 on optical axis Foot 0.9 < T34/CT4 < 1.4, more specifically, T34 and CT4 can further meet 1.08≤T34/CT4≤1.16.In another example the The airspace T23 of two lens and the third lens on optical axis and the airspace of the third lens and the 4th lens on optical axis T23/T34 < 0.2 can be met between T34, more specifically, T23 and T34 can further meet 0.06≤T23/T34≤0.11.It is right The rational deployment of optical mirror slip packet size structure, is advantageously implemented the compression to lens length size, and slows down light and enter and be Direction change after system, to facilitate the intensity of reduction stray light.

In addition, object of the first lens to the 4th lens respectively at the sum of center thickness on optical axis ∑ CT and the first lens 0.4 < ∑ CT/TTL < 0.6 can be met between distance TTL on side to the axis of the imaging surface of optical mirror slip group, more specifically, ∑ CT and TTL can further meet 0.51≤∑ CT/TTL≤0.54, in favor of improving the processability of eyeglass and the group of lens set Vertical technique.

It can between the effective radius SD42 of the image side surface of the effective radius SD11 and the 4th lens of the object side of first lens Meet 1.0 < SD11/SD42 < 1.5, more specifically, SD11 and SD42 can further meet 1.23≤SD11/SD42≤1.45, To realize the compression to optical mirror slip group lateral dimension.

In the exemplary embodiment, distance TTL on the object side of the first lens to the axis of the imaging surface of optical mirror slip group 0.8 < TTL/f < 1.05 can be met between total effective focal length f of optical mirror slip group, more specifically, TTL and f can further expire Foot 1.00≤TTL/f≤1.01.When optical mirror slip group meets conditional 0.8 < TTL/f < 1.05, system structure size can be embodied With the rational deployment of focal power, advantageously ensures that shortening system structure size under conditions of aberration balancing, realize miniaturization.

In addition, also reasonable Arrangement can be carried out to the radius of curvature of each mirror surface.For example, the curvature of the image side surface of the first lens 0 < (R2-R3)/(R2+R3)≤1.0 can be met between the radius of curvature R 3 of the object side of radius R2 and the second lens, more specifically Ground, R2 and R3 can further meet 0.16≤(R2-R3)/(R2+R3)≤0.95.The reasonable distribution of each lens radius of curvature, has Conducive to axial aberration is reduced, realize that optical mirror slip group takes the photograph remote effect, while mitigating the susceptibility of optical mirror slip group.

It in the exemplary embodiment, can between the abbe number V2 of the second lens and the abbe number V1 of the first lens Meet | V2-V1 | > 30.More specifically, V2 and V1 can further meet | V2-V1 |=34.6.When the abbe number of the second lens Meet between V2 and the abbe number V1 of the first lens | V2-V1 | when > 30, be conducive to update the system color difference, and improving optical mirror The image quality of piece group.

Optionally, the optical mirror slip group of the application may also include the optical filter for correcting color error ratio.Optical filter can be set It sets for example between the 4th lens and imaging surface.It will be apparent to a skilled person that optical filter can be set as needed At other positions.

Multi-disc eyeglass, such as described above four can be used according to the optical mirror slip group of the above embodiment of the application Piece.Pass through spacing on the axis between each power of lens of reasonable distribution, face type and each lens etc., it is ensured that optical mirror slip The focal length characteristic of group improves systemic resolution, reduces system sensitivity, guaranteeing the miniaturization of optical mirror slip group and improve imaging Quality produces and processes so that optical mirror slip group is more advantageous to and is applicable to portable electronic product.In the application Embodiment in, at least one of mirror surface of each lens be aspherical mirror.The characteristics of non-spherical lens, is: from lens Center to periphery curvature be consecutive variations.It is different from there is the spherical lens of constant curvature from lens centre to periphery, it is aspherical Lens have more preferably radius of curvature characteristic, have the advantages that improve and distort aberration and improvement astigmatic image error.Using aspherical After mirror, the aberration occurred when imaging can be eliminated as much as possible, to improve the image quality of optical mirror slip group.

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 optical mirror slip group can be changed, to obtain each result and advantage described in this specification.For example, Although being described by taking four lens as an example in embodiments, which is not limited to include four lens. If desired, the optical mirror slip group may also include the lens of other quantity.

The specific embodiment for being applicable to the optical mirror slip group of above embodiment is further described with reference to the accompanying drawings.

Embodiment 1

Referring to Fig. 1 to Fig. 2 C description according to the optical mirror slip group of the embodiment of the present application 1.

Fig. 1 shows the structural schematic diagram of the optical mirror slip group according to the embodiment of the present application 1.

As shown in Figure 1, optical mirror slip group includes from object side to four lens E1- at image side sequential along optical axis E4.First lens E1 has positive light coke, and object side S1 and image side surface S2 are aspherical；Second lens E2 has negative Focal power, object side S3 and image side surface S4 are aspherical；The third lens E3 has positive light coke, object side S5 and picture Side S6 is aspherical；And the 4th lens E4, there is negative power, object side S7 and image side surface S8 are aspherical. Optionally, optical mirror slip group may also include the optical filter E5 with object side S9 and image side surface S10.In the optics of the present embodiment In lens set, the diaphragm STO for limiting light beam can be also set between such as object side and the first lens E1, to improve imaging Quality.Light from object sequentially passes through each surface S1 to S10 and is ultimately imaged on imaging surface S11.

Table 1 show the surface type of each lens of optical mirror slip group in embodiment 1, radius of curvature, thickness, material and Circular cone coefficient.

Table 1

It can be obtained by table 1, the song of the object side S3 of the radius of curvature R 2 of the image side surface S2 of the first lens E1 and the second lens E2 Meet (R2-R3)/(R2+R3)=0.35 between rate radius R3；Between air of the second lens E2 and the third lens E3 on optical axis Meet T23/T34=0.07 between the airspace T34 on optical axis every T23 and the third lens E3 and the 4th lens E4；Third Lens E3 and the 4th lens E4 on optical axis airspace T34 and the 4th lens E4 between the center thickness CT4 on optical axis Meet T34/CT4=1.10；Meet between the abbe number V2 of second lens E2 and the abbe number V1 of the first lens E1 | V2- V1 |=34.6.

The present embodiment uses four lens as an example, the face for passing through each power of lens of reasonable distribution, each lens Type, each lens center thickness and each lens between interval so that optical mirror slip group meet miniaturization while, With long-focus and high-resolution.Each aspherical face type x is limited by following 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, and c=1/R (that is, inverse that paraxial curvature c is upper 1 mean curvature radius R of table)；K is circular cone coefficient (having been provided in upper table 1)；Ai is the correction factor of aspherical i-th-th rank.The following table 2, which is shown, can be used in embodiment 1 respectively Each high-order coefficient A of aspherical mirror S1-S8₄、A₆、A₈、A₁₀、A₁₂And A₁₄。

Face number

A4

A6

A8

A10

A12

A14

S1

-9.6000E-04

-2.0000E-04

-1.0000E-05

-4.3000E-06

0

0

S2

-2.8000E-05

-1.9000E-03

3.7400E-04

-2.6000E-05

0

0

S3

4.8200E-03

-1.6000E-03

3.4900E-04

-2.2000E-05

0

0

S4

-5.2000E-03

-8.7800E-03

-1.9000E-03

1.3900E-04

0

0

S5

-3.1000E-02

1.5400E-02

-3.2000E-03

2.2600E-04

0

0

S6

-3.7500E-02

9.0700E-03

-1.7000E-03

1.2900E-04

0

0

S7

-5.3400E-02

2.4300E-03

-1.6000E-05

3.0300E-04

-2.0000E-04

3.1300E-05

S8

-4.0600E-02

2.2000E-03

1.4700E-03

-8.6000E-04

1.8600E-04

-1.7000E-05

Table 2

Table 3 gives the effective focal length f1 to f4 of each lens of embodiment 1, total effective focal length f of optical mirror slip group, Effective pixel area diagonal line on distance TTL and imaging surface S11 on the axis of the object side S1 to imaging surface S11 of one lens E1 Long half ImgH.

Parameter	f1(mm)	f2(mm)	f3(mm)	f4(mm)	f(mm)	TTL(mm)	ImgH(mm)
								Numerical value	6.54	-14.12	583.47	-15.04	12.43	12.53	3.18

Table 3

According to table 3, meet between the effective focal length f1 of the first lens E1 and the effective focal length f2 of the second lens E2 | F1/f2 |=0.60；Meet between the effective focal length f3 of the effective focal length f4 and the third lens E3 of 4th lens E4 | f4/f3 |= 0.32；On the axis of the object side S1 to imaging surface S11 of first lens E1 total effective focal length f of distance TTL and optical mirror slip group it Between meet TTL/f=1.01.It can be obtained in conjunction with table 1 and table 3, the first lens E1 to the 4th lens E4 is respectively at the center on optical axis Meet ∑ CT/TTL=between distance TTL on the axis of the object side S1 to imaging surface S11 of the sum of thickness ∑ CT and the first lens E1 0.54。

In addition, in the present embodiment, HFOV=14.2 ° of maximum angle of half field-of view of optical mirror slip group；The object of first lens E1 Meet SD11/SD42=between the effective radius SD42 of the image side surface S8 of the effective radius SD11 and the 4th lens E4 of side S1 1.31；The combined focal length f123 of first lens E1, the second lens E2 and the third lens E3 and total effective focal length of optical mirror slip group Meet f123/f=0.79 between f.

Fig. 2A shows chromatic curve on the axis of the optical mirror slip group of embodiment 1, indicate the light of different wave length via Converging focal point after optical mirror slip group deviates.Fig. 2 B shows the astigmatism curve of the optical mirror slip group of embodiment 1, indicates son Noon curvature of the image and sagittal image surface bending.Fig. 2 C shows the distortion curve of the optical mirror slip group of embodiment 1, indicates different Distortion sizes values in the case of visual angle.A to Fig. 2 C is it is found that optical mirror slip group given by embodiment 1 can be realized according to fig. 2 Good image quality.

Embodiment 2

Referring to Fig. 3 to Fig. 4 C description according to the optical mirror slip group of the embodiment of the present application 2.In the present embodiment and following In embodiment, for brevity, by clipped description similar to Example 1.Fig. 3 is shown according to the embodiment of the present application 2 Optical mirror slip group structural schematic diagram.

As shown in figure 3, optical mirror slip group includes from object side to four lens E1- at image side sequential along optical axis E4.First lens E1 has positive light coke, and object side S1 and image side surface S2 are aspherical；Second lens E2 has negative Focal power, object side S3 and image side surface S4 are aspherical；The third lens E3 has positive light coke, object side S5 and picture Side S6 is aspherical；And the 4th lens E4, there is negative power, object side S7 and image side surface S8 are aspherical. Optionally, optical mirror slip group may also include the optical filter E5 with object side S9 and image side surface S10.In the optics of the present embodiment In lens set, the diaphragm STO for limiting light beam can be also set between such as object side and the first lens E1, to improve imaging Quality.Light from object sequentially passes through each surface S1 to S10 and is ultimately imaged on imaging surface S11.

Table 4 show the surface type of each lens of optical mirror slip group in embodiment 2, radius of curvature, thickness, material and Circular cone coefficient.Table 5 shows the high-order coefficient of each aspherical mirror in embodiment 2.Table 6 shows each lens of embodiment 2 Effective focal length f1 to f4, total effective focal length f of optical mirror slip group, the first lens E1 object side S1 to imaging surface S11 axis On on distance TTL and imaging surface S11 effective pixel area diagonal line length half ImgH.Wherein, each aspherical face type can be by The formula (1) provided in above-described embodiment 1 limits.

Table 4

Table 5

Parameter	f1(mm)	f2(mm)	f3(mm)	f4(mm)	f(mm)	TTL(mm)	ImgH(mm)
								Numerical value	6.49	-13.69	16690	-15.08	12.56	12.53	3.18

Table 6

Fig. 4 A shows chromatic curve on the axis of the optical mirror slip group of embodiment 2, indicate the light of different wave length via Converging focal point after optical mirror slip group deviates.Fig. 4 B shows the astigmatism curve of the optical mirror slip group of embodiment 2, indicates son Noon curvature of the image and sagittal image surface bending.Fig. 4 C shows the distortion curve of the optical mirror slip group of embodiment 2, indicates different Distortion sizes values in the case of visual angle.According to Fig. 4 A to Fig. 4 C it is found that optical mirror slip group given by embodiment 2 can be realized Good image quality.

Embodiment 3

The optical mirror slip group according to the embodiment of the present application 3 is described referring to Fig. 5 to Fig. 6 C.Fig. 5 is shown according to this Apply for the structural schematic diagram of the optical mirror slip group of embodiment 3.

As shown in figure 5, optical mirror slip group includes from object side to four lens E1- at image side sequential along optical axis E4.First lens E1 has positive light coke, and object side S1 and image side surface S2 are aspherical；Second lens E2 has negative Focal power, object side S3 and image side surface S4 are aspherical；The third lens E3 has positive light coke, object side S5 and picture Side S6 is aspherical；And the 4th lens E4, there is negative power, object side S7 and image side surface S8 are aspherical. Optionally, optical mirror slip group may also include the optical filter E5 with object side S9 and image side surface S10.In the optics of the present embodiment In lens set, the diaphragm STO for limiting light beam can be also set between such as object side and the first lens E1, to improve imaging Quality.Light from object sequentially passes through each surface S1 to S10 and is ultimately imaged on imaging surface S11.

Table 7 show the surface type of each lens of optical mirror slip group in embodiment 3, radius of curvature, thickness, material and Circular cone coefficient.Table 8 shows the high-order coefficient of each aspherical mirror in embodiment 3.Table 9 shows each lens of embodiment 3 Effective focal length f1 to f4, total effective focal length f of optical mirror slip group, the first lens E1 object side S1 to imaging surface S11 axis On on distance TTL and imaging surface S11 effective pixel area diagonal line length half ImgH.Wherein, each aspherical face type can be by The formula (1) provided in above-described embodiment 1 limits.

Table 7

Face number

A4

A6

A8

A10

A12

A14

S1

-9.6000E-04

-2.0000E-04

-1.0000E-05

-4.3000E-06

0

0

S1

-9.5776E-04

-1.3906E-04

-1.7316E-05

-3.9531E-06

0

0

S2

-3.2613E-04

-1.5910E-03

2.6821E-04

-1.6899E-05

0

0

S3

4.5629E-03

-1.3099E-03

2.7187E-04

-1.5392E-05

0

0

S4

-5.6317E-03

8.5925E-03

-1.7499E-03

1.1178E-04

0

0

S5

-3.1859E-02

1.5468E-02

-3.1500E-03

2.1747E-04

0

0

S6

-3.6185E-02

9.1878E-03

-1.8097E-03

1.4458E-04

0

0

S7

-5.1734E-02

3.1290E-03

-6.3174E-04

5.5784E-04

-2.5819E-04

3.7214E-05

S8

-4.0498E-02

2.4209E-03

1.1661E-03

-7.6995E-04

1.7626E-04

-1.7802E-05

Table 8

Parameter	f1(mm)	f2(mm)	f3(mm)	f4(mm)	f(mm)	TTL(mm)	ImgH(mm)
								Numerical value	6.58	-12.89	227.98	-15.86	12.55	12.53	3.18

Table 9

Fig. 6 A shows chromatic curve on the axis of the optical mirror slip group of embodiment 3, indicate the light of different wave length via Converging focal point after optical mirror slip group deviates.Fig. 6 B shows the astigmatism curve of the optical mirror slip group of embodiment 3, indicates son Noon curvature of the image and sagittal image surface bending.Fig. 6 C shows the distortion curve of the optical mirror slip group of embodiment 3, indicates different Distortion sizes values in the case of visual angle.According to Fig. 6 A to Fig. 6 C it is found that optical mirror slip group given by embodiment 3 can be realized Good image quality.

Embodiment 4

The optical mirror slip group according to the embodiment of the present application 4 is described referring to Fig. 7 to Fig. 8 C.Fig. 7 is shown according to this Apply for the structural schematic diagram of the optical mirror slip group of embodiment 4.

As shown in fig. 7, optical mirror slip group includes from object side to four lens E1- at image side sequential along optical axis E4.First lens E1 has positive light coke, and object side S1 and image side surface S2 are aspherical；Second lens E2 has negative Focal power, object side S3 and image side surface S4 are aspherical；The third lens E3 has positive light coke, object side S5 and picture Side S6 is aspherical；And the 4th lens E4, there is negative power, object side S7 and image side surface S8 are aspherical. Optionally, optical mirror slip group may also include the optical filter E5 with object side S9 and image side surface S10.In the optics of the present embodiment In lens set, the diaphragm STO for limiting light beam can be also set between such as object side and the first lens E1, to improve imaging Quality.Light from object sequentially passes through each surface S1 to S10 and is ultimately imaged on imaging surface S11.

Table 10 show the surface type of each lens of optical mirror slip group in embodiment 4, radius of curvature, thickness, material and Circular cone coefficient.Table 11 shows the high-order coefficient of each aspherical mirror in embodiment 4.Table 12 shows each of embodiment 4 The effective focal length f1 to f4 of mirror, total effective focal length f of optical mirror slip group, the first lens E1 object side S1 to imaging surface S11's On axis on distance TTL and imaging surface S11 effective pixel area diagonal line length half ImgH.Wherein, each aspherical face type can It is limited by the formula (1) provided in above-described embodiment 1.

Table 10

Face number

A4

A6

A8

A10

A12

A14

S1

-6.9929E-04

-2.6008E-04

5.8927E-06

-6.5022E-06

0

0

S2

-1.2074E-03

-1.1305E-03

1.3988E-04

-7.8622E-06

0

0

S3

2.7431E-03

-4.5763E-04

9.6079E-05

-3.8713E-06

0

0

S4

-2.8930E-02

2.6648E-02

-7.0799E-03

6.6678E-04

0

0

S5

-5.5932E-02

3.8146E-02

-1.0291E-02

9.8777E-04

0

0

S6

-3.3314E-02

1.0221E-02

-2.7824E-03

2.7229E-04

0

0

S7

-4.9298E-02

3.5203E-03

-1.7875E-04

-2.1692E-04

6.6080E-06

9.2997E-06

S8

-3.8349E-02

3.0474E-03

6.2855E-04

-5.6109E-04

1.3101E-04

-1.2095E-05

Table 11

Parameter	f1(mm)	f2(mm)	f3(mm)	f4(mm)	f(mm)	TTL(mm)	ImgH(mm)
								Numerical value	6.75	-13.62	105.8	-15.12	12.43	12.53	3.18

Table 12

Fig. 8 A shows chromatic curve on the axis of the optical mirror slip group of embodiment 4, indicate the light of different wave length via Converging focal point after optical mirror slip group deviates.Fig. 8 B shows the astigmatism curve of the optical mirror slip group of embodiment 4, indicates son Noon curvature of the image and sagittal image surface bending.Fig. 8 C shows the distortion curve of the optical mirror slip group of embodiment 4, indicates different Distortion sizes values in the case of visual angle.According to Fig. 8 A to Fig. 8 C it is found that optical mirror slip group given by embodiment 4 can be realized Good image quality.

Embodiment 5

The optical mirror slip group according to the embodiment of the present application 5 is described referring to Fig. 9 to Figure 10 C.Fig. 9 shows basis The structural schematic diagram of the optical mirror slip group of the embodiment of the present application 5.

As shown in figure 9, optical mirror slip group includes from object side to four lens E1- at image side sequential along optical axis E4.First lens E1 has positive light coke, and object side S1 and image side surface S2 are aspherical；Second lens E2 has negative Focal power, object side S3 and image side surface S4 are aspherical；The third lens E3 has negative power, object side S5 and picture Side S6 is aspherical；And the 4th lens E4, there is negative power, object side S7 and image side surface S8 are aspherical. Optionally, optical mirror slip group may also include the optical filter E5 with object side S9 and image side surface S10.In the optics of the present embodiment In lens set, the diaphragm STO for limiting light beam can be also set between such as object side and the first lens E1, to improve imaging Quality.Light from object sequentially passes through each surface S1 to S10 and is ultimately imaged on imaging surface S11.

Table 13 show the surface type of each lens of optical mirror slip group in embodiment 5, radius of curvature, thickness, material and Circular cone coefficient.Table 14 shows the high-order coefficient of each aspherical mirror in embodiment 5.Table 15 shows each of embodiment 5 The effective focal length f1 to f4 of mirror, total effective focal length f of optical mirror slip group, the first lens E1 object side S1 to imaging surface S11's On axis on distance TTL and imaging surface S11 effective pixel area diagonal line length half ImgH.Wherein, each aspherical face type can It is limited by the formula (1) provided in above-described embodiment 1.

Table 13

Table 14

Parameter	f1(mm)	f2(mm)	f3(mm)	f4(mm)	f(mm)	TTL(mm)	ImgH(mm)
								Numerical value	6.35	-13.15	-2647.6	-15.42	12.43	12.53	3.18

Table 15

Figure 10 A shows chromatic curve on the axis of the optical mirror slip group of embodiment 5, indicates the light warp of different wave length Deviateed by the converging focal point after optical mirror slip group.Figure 10 B shows the astigmatism curve of the optical mirror slip group of embodiment 5, indicates Meridianal image surface bending and sagittal image surface bending.Figure 10 C shows the distortion curve of the optical mirror slip group of embodiment 5, indicates not With the distortion sizes values in the case of visual angle.According to Figure 10 A to Figure 10 C it is found that optical mirror slip group can given by embodiment 5 Realize good image quality.

Embodiment 6

The optical mirror slip group according to the embodiment of the present application 6 is described referring to Figure 11 to Figure 12 C.Figure 11 shows root According to the structural schematic diagram of the optical mirror slip group of the embodiment of the present application 6.

As shown in figure 11, optical mirror slip group includes from object side to four lens E1- at image side sequential along optical axis E4.First lens E1 has positive light coke, and object side S1 and image side surface S2 are aspherical；Second lens E2 has negative Focal power, object side S3 and image side surface S4 are aspherical；The third lens E3 has negative power, object side S5 and picture Side S6 is aspherical；And the 4th lens E4, there is negative power, object side S7 and image side surface S8 are aspherical. Optionally, optical mirror slip group may also include the optical filter E5 with object side S9 and image side surface S10.In the optics of the present embodiment In lens set, the diaphragm STO for limiting light beam can be also set between such as object side and the first lens E1, to improve imaging Quality.Light from object sequentially passes through each surface S1 to S10 and is ultimately imaged on imaging surface S11.

Table 16 show the surface type of each lens of optical mirror slip group in embodiment 6, radius of curvature, thickness, material and Circular cone coefficient.Table 17 shows the high-order coefficient of each aspherical mirror in embodiment 6.Table 18 shows each of embodiment 6 The effective focal length f1 to f4 of mirror, total effective focal length f of optical mirror slip group, the first lens E1 object side S1 to imaging surface S11's On axis on distance TTL and imaging surface S11 effective pixel area diagonal line length half ImgH.Wherein, each aspherical face type can It is limited by the formula (1) provided in above-described embodiment 1.

Table 16

Face number

A4

A6

A8

A10

A12

A14

S1

-8.7927E-04

-1.7372E-04

-7.8794E-06

-4.8667E-06

0

0

S2

1.9857E-04

-2.0234E-03

4.3986E-04

-3.5462E-05

0

0

S3

4.5195E-03

-1.8244E-03

4.6683E-04

-3.5331E-05

0

0

S4

3.9446E-04

4.6860E-03

-8.0377E-04

3.7516E-05

0

0

S5

-2.5836E-02

1.1621E-02

-2.1980E-03

1.1528E-04

0

0

S6

-3.6963E-02

9.2692E-03

-2.0189E-03

1.5033E-04

0

0

S7

-5.0300E-02

5.2044E-03

-3.6358E-03

2.0647E-03

-6.8624E-04

8.5310E-05

S8

-3.9352E-02

4.1385E-03

-4.0156E-04

-8.3119E-05

2.5457E-05

-3.2518E-06

Table 17

Parameter	f1(mm)	f2(mm)	f3(mm)	f4(mm)	f(mm)	TTL(mm)	ImgH(mm)
								Numerical value	5.60	-15.92	-26.02	-15.97	12.39	12.53	3.18

Table 18

Figure 12 A shows chromatic curve on the axis of the optical mirror slip group of embodiment 6, indicates the light warp of different wave length Deviateed by the converging focal point after optical mirror slip group.Figure 12 B shows the astigmatism curve of the optical mirror slip group of embodiment 6, indicates Meridianal image surface bending and sagittal image surface bending.Figure 12 C shows the distortion curve of the optical mirror slip group of embodiment 6, indicates not With the distortion sizes values in the case of visual angle.According to figure 12 A to figure 12 C it is found that optical mirror slip group can given by embodiment 6 Realize good image quality.

To sum up, embodiment 1 to embodiment 6 meets relationship shown in following table 19 respectively.

Conditional embodiment	1	2	3	4	5	6
							HFOV(°)	14.2	14.1	14.1	14.2	14.2	14.2
T34/CT4	1.10	1.11	1.16	1.16	1.08	1.16
							f123/f	0.79	0.79	0.80	0.79	0.79	0.80
(R2-R3)/(R2+R3)	0.35	0.38	0.42	0.44	0.95	0.16
							T23/T34	0.07	0.07	0.08	0.06	0.11	0.06
|f3/f4|	0.32	0.00	0.07	0.14	0.01	0.61
							|f1/f2|	0.60	0.47	0.51	0.50	0.48	0.35
∑CT/TTL	0.54	0.53	0.53	0.54	0.51	0.54
							SD11/SD42	1.31	1.37	1.41	1.41	1.45	1.23
|V2-V1|	34.6	34.6	34.6	34.6	34.6	34.6
							TTL/f	1.01	1.00	1.00	1.01	1.01	1.01

Table 19

The application also provides a kind of imaging device, and electronics photosensitive element can be photosensitive coupling element (CCD) or complementation Property matal-oxide semiconductor element (CMOS).Imaging device can be the independent imaging equipment of such as digital camera, be also possible to The image-forming module being integrated on the mobile electronic devices such as mobile phone.The imaging device is equipped with optical mirror slip described above Group.

Above description is only the preferred embodiment of the application and the explanation to institute's application technology principle.Art technology Personnel should be appreciated that invention scope involved in the application, however it is not limited to skill made of the specific combination of above-mentioned technical characteristic Art scheme, while should also cover in the case where not departing from the inventive concept, by above-mentioned technical characteristic or its equivalent feature into Row any combination and the other technical solutions formed.Such as features described above and (but being not limited to) disclosed herein have class Technical characteristic like function is replaced mutually and the technical solution that is formed.

Claims (21)

1. optical mirror slip group sequentially includes: the first lens, the second lens, the third lens and the 4th from object side to image side along optical axis Lens,

It is characterized in that,

First lens have positive light coke, and object side is convex surface；

Second lens have negative power, and object side is concave surface；

The third lens have positive light coke or negative power；

4th lens have negative power,

The airspace T23 of second lens and the third lens on the optical axis and the third lens and described the Airspace T34 of four lens on the optical axis meets T23/T34 < 0.2；

The maximum angle of half field-of view HFOV of the optical mirror slip group meets HFOV≤20 °；And

At least one of first lens, second lens, the third lens and mirror surface of the 4th lens are Aspherical mirror.

2. optical mirror slip group according to claim 1, which is characterized in that first lens, second lens and institute The combination focal power for stating the third lens is positive light coke.

3. optical mirror slip group according to claim 2 has total effective focal length f, which is characterized in that first lens, Second lens and the combined focal length f123 of the third lens and total effective focal length f meet 0.6 < f123/f < 1.0.

4. optical mirror slip group according to claim 1, which is characterized in that the third lens and the 4th lens are in institute State airspace T34 on optical axis and the 4th lens in the center thickness CT4 on the optical axis meet 0.9 < T34/CT4 < 1.4。

5. optical mirror slip group according to claim 1, which is characterized in that the radius of curvature of the image side surface of first lens The radius of curvature R 3 of the object side of R2 and second lens meets 0 < (R2-R3)/(R2+R3)≤1.0.

6. optical mirror slip group according to claim 1, which is characterized in that the effective focal length f4 of the 4th lens with it is described The effective focal length f3 of the third lens meets | f4/f3 | < 1.

7. optical mirror slip group according to claim 1, which is characterized in that the effective focal length f1 of first lens with it is described The effective focal length f2 of second lens meets | f1/f2 | < 1.

8. optical mirror slip group according to claim 1, which is characterized in that first lens to the 4th lens are distinguished Imaging surface in the object side of the sum of center thickness on optical axis ∑ CT and first lens to the optical mirror slip group Axis on distance TTL meet 0.4 < ∑ CT/TTL < 0.6.

9. optical mirror slip group according to claim 1, which is characterized in that the effective radius of the object side of first lens The effective radius SD42 of the image side surface of SD11 and the 4th lens meets 1.0 < SD11/SD42 < 1.5.

10. optical mirror slip group according to claim 1, which is characterized in that the abbe number V2 of second lens and institute The abbe number V1 for stating the first lens meets | V2-V1 | > 30.

11. optical mirror slip group according to claim 1, which is characterized in that the object side of first lens to the light It learns distance TTL and total effective focal length f of the optical mirror slip group on the axis of the imaging surface of lens set and meets 0.8 < TTL/f < 1.05.

12. optical mirror slip group, there is total effective focal length f, the optical mirror slip group sequentially includes: the from object side to image side along optical axis One lens, the second lens, the third lens and at least one subsequent lens,

It is characterized in that,

First lens have positive light coke, and object side is convex surface；

Second lens have negative power, and object side is concave surface；

The third lens have positive light coke or negative power,

The combination focal power of first lens, second lens and the third lens is positive light coke, a combination thereof focal length F123 and total effective focal length f meet 0.6 < f123/f < 1.0；

The maximum angle of half field-of view HFOV of the optical mirror slip group meets HFOV≤20 °；And

First lens, second lens, the third lens and at least one subsequent lens mirror surface in extremely Few one is aspherical mirror.

13. optical mirror slip group according to claim 12, which is characterized in that the curvature of the image side surface of first lens half The radius of curvature R 3 of the object side of diameter R2 and second lens meets 0 < (R2-R3)/(R2+R3)≤1.0.

14. optical mirror slip group according to claim 12, which is characterized in that the effective focal length f1 of first lens and institute The effective focal length f2 for stating the second lens meets | f1/f2 | < 1.

15. optical mirror slip group according to claim 12, which is characterized in that the abbe number V2 of second lens and institute The abbe number V1 for stating the first lens meets | V2-V1 | > 30.

16. optical mirror slip group according to claim 12, which is characterized in that at least one described subsequent lens include having 4th lens of negative power,

The airspace T34 of the third lens and the 4th lens on the optical axis and the 4th lens are in the light Center thickness CT4 on axis meets 0.9 < T34/CT4 < 1.4.

17. optical mirror slip group according to claim 16, which is characterized in that second lens and the third lens exist Airspace T23 and the airspace T34 of the third lens and the 4th lens on the optical axis on the optical axis Meet T23/T34 < 0.2.

18. optical mirror slip group according to claim 16, which is characterized in that the effective focal length f4 of the 4th lens and institute The effective focal length f3 for stating the third lens meets | f4/f3 | < 1.

19. optical mirror slip group according to claim 16, which is characterized in that first lens to the 4th lens point Not in the imaging of the object side of the sum of center thickness on optical axis ∑ CT and first lens to the optical mirror slip group Distance TTL meets 0.4 < ∑ CT/TTL < 0.6 on the axis in face.

20. optical mirror slip group according to claim 16, which is characterized in that effectively the half of the object side of first lens The effective radius SD42 of the image side surface of diameter SD11 and the 4th lens meets 1.0 < SD11/SD42 < 1.5.

21. optical mirror slip group according to claim 16, which is characterized in that the object side of first lens to the light It learns distance TTL and total effective focal length f of the optical mirror slip group on the axis of the imaging surface of lens set and meets 0.8 < TTL/f < 1.05.