CN101520544A - Variable curvature lens structure - Google Patents

Abstract

The invention provides a variable curvature lens structure, which comprises a first lens component L1, a second lens component L2, a third lens component L3, a fourth lens component L4 and a fifth lens component L5 in order from an object side to an image side along an optical axis. In addition, a flat lens (with an infinite focal length) is disposed behind the fifth lens element L5 in the direction from the object side to the image side 1 along the optical axis. Preferably, the flat lens may be an infrared filter (IR filter), an optical filter, or a protective glass sheet. Wherein the second lens component L2 can adjust the variable curvature so as to adjust the focal length of the lens.

Description

The lens arrangement of variable curvature

Technical field

The present invention relates to a kind of optical module, particularly about a kind of lens arrangement of variable curvature.

Background technology

Along with scientific-technical progress, electronic product is constantly towards the development of compact characteristic, for example, digital camera, computer cameras, has mobile phone of image detection device or the like, therefore, the optical module of these electronic installations or device also must be microminiaturized more with the symbol technology trends.

For easy to carry and meet the demand of hommization, its image-taking device not only needs favorable imaging quality, also needs smaller volume and lower cost simultaneously, also must promote the application of image-taking device.In recent years, in the field of optical devices, constantly improve about the little propertyization of image detection components and the technology of high pixel density.Yet,, will have its usefulness of some factor affecting in order to realize microminiaturized purpose.When Lens is got over when becoming to dwindling, because the restriction of its physics, must limit the usefulness of its image detection device.

The adjustable focus of traditional camera and digital camera, Varifocal zoom lens and general miniature device are (for example, the mobile phone that generally has camera function) difference, limit by size, the employed Lens of most miniaturized devices is less relatively, structure is also simplified, and majority is all tight shot, and the scope that can take limits to some extent.

Though by improving photosensitive coupling component (Charge Coupled Device, CCD), CMOS (Complementary Metal Oxide Semiconductor) (Complementary Metal-Oxide Semiconductor, image sensing component technology such as CMOS), can promote the pixel of image detection device, so, because the general employed camera lens of camera mobile phone is all tight shot, its effective focal length value f is a fixed value.All (back focus length BFL) finishes focusing to the focusing mode of general fixed focal length by changing back Jiao.When subject near more and preceding Jiao more in short-term, the burnt change amount in back is bigger, when current Jiao changed to 20f, the quality of image is variation; And if adopt digital zoom can influence the image quality of image usually.

Though having, prior art discloses the zoom lens that is applied to miniaturized devices, comprise a plurality of lens combination from the object side to image side in regular turn, reach Zoom effect by the distance that changes between a plurality of lens combination, yet, above-mentioned zoom lens is when changing the visual angle, the length dimension of whole camera lens will change and change along with shooting state, this class camera lens is to be difficult to be assembled to miniaturized devices, and change between lens combination apart from the time, also be easy to generate noise, moreover the required eyeglass of above-mentioned camera lens is also more, and cost is also quite expensive.From the above, Technology Need has and a kind ofly has vista shot and close-up photography function now, and the demand of the Zoom optic lens of size microminiaturization.

Summary of the invention

The lens arrangement that the purpose of this invention is to provide a kind of variable curvature is to overcome foregoing problems.

A further object of the present invention is to be to provide the lens arrangement of taking into account extremely nearly object distance A (A〉10mm) and infinite distance object distance A (A=∞) photographic quality.The said lens structure comprises first sphere or non-spherical lens, the second variable curvature mirror group, the 3rd non-spherical lens, the 4th non-spherical lens and the 5th non-spherical lens.Wherein the second variable curvature mirror group is via voltage-controlled its interfacial curvature of mode modulation, so that make camera lens be taken extremely near (object distance A〉5f, f is the optics of the lens arrangement effective focal length that is for this reason) and (infinite distance extremely far away; Object distance A=∞) image.

The present invention is the lens arrangement that discloses a kind of variable curvature, along an optical axis, extremely comprises in regular turn as side from the thing side: one first lenticular unit, have negative diopter, and the convex surface of its first lenticular unit is towards the thing side; One second lenticular unit is an electric control zooming assembly, and wherein its second lenticular unit utilizes voltage-controlled its focal length of mode modulation, so that make the focal length of the lens arrangement of its this variable curvature of modulation; One the 3rd lenticular unit has positive diopter, and wherein its 3rd lenticular unit is all convex surface towards the thing side and as the surface of side; One the 4th lenticular unit has negative diopter, and wherein its 4th lenticular unit is a concave surface towards the surface as side; And one the 5th lenticular unit, have positive diopter, wherein the convex surface of its 5th lenticular unit is towards the picture side.

Lens arrangement according to variable curvature provided by the present invention must satisfy the following relationship formula:

$0<|\frac{\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="A200810082508E00171.png,A200810082508E00173.png"\; state="\{\{state\}\}">f</figure-callout>}1}{\mathrm{fn}}-\frac{\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="A200810082508E00171.png,A200810082508E00173.png"\; state="\{\{state\}\}">f</figure-callout>}1}{\mathrm{fm}}|<0.12;$

$0<|\frac{\mathrm{fm}}{f2n}-\frac{\mathrm{fn}}{f2n}|<0.12;$

$0<|\frac{\mathrm{<figure-callout\; id="3"\; label="f"\; filenames="A200810082508E00171.png,A200810082508E00181.png"\; state="\{\{state\}\}">f</figure-callout>}3}{\mathrm{fm}}-\frac{\mathrm{<figure-callout\; id="3"\; label="f"\; filenames="A200810082508E00171.png,A200810082508E00181.png"\; state="\{\{state\}\}">f</figure-callout>}3}{\mathrm{fn}}|<0.1;$

$0<|\frac{\mathrm{<figure-callout\; id="4"\; label="f"\; filenames="A200810082508E00181.png,A200810082508E00201.png"\; state="\{\{state\}\}">f</figure-callout>}4}{\mathrm{fm}}-\frac{\mathrm{<figure-callout\; id="4"\; label="f"\; filenames="A200810082508E00181.png,A200810082508E00201.png"\; state="\{\{state\}\}">f</figure-callout>}4}{\mathrm{fn}}|<0.1;$

$0<|\frac{\mathrm{<figure-callout\; id="5"\; label="f"\; filenames="A200810082508E00181.png,A200810082508E00201.png"\; state="\{\{state\}\}">f</figure-callout>}5}{\mathrm{fm}}-\frac{\mathrm{<figure-callout\; id="5"\; label="f"\; filenames="A200810082508E00181.png,A200810082508E00201.png"\; state="\{\{state\}\}">f</figure-callout>}5}{\mathrm{fn}}|<0.2;$

(6)-2.7<f1/fn<0；

(7)0<f3/fn<0.85；

(8)-1<f4/fn<0；

(9)0<f5/fn<2.5；

Wherein, the effective focal length of its first lenticular unit is f1, and the effective focal length of its 3rd lenticular unit is f3, and the effective focal length of its 4th lenticular unit is f4, and the effective focal length of its 5th lenticular unit is f5; Wherein, under the first object distance situation, the focal length of the lens arrangement of variable curvature is fm, and the focal length of second lenticular unit is f2m; Under the second object distance situation, the focal length of the lens arrangement of variable curvature is fn, and the focal length of second lenticular unit is f2n.

Above-mentioned second lenticular unit, one electric control varifocal lens is formed the curvature (radius) of modulation zoom lens according to the voltage of being applied to zoom lens by one first material layers and one second material layers.

The lens arrangement of variable curvature of the present invention has overcome the situation of conventional fixed focal length lens quality of image variation when close-perspective recording.The lens arrangement of variable curvature of the present invention utilizes above-mentioned electric control varifocal lens to change curvature, with camera lens when the difference photography object distance, with the form of micro-zoom come correspondence extremely near (object distance A〉5f, focal length variations when the effective focal length of the lens arrangement optical system of variable curvature) photography and infinite distance (object distance A=∞) photograph so can more can obtain higher resolving power than fixed focus lens.

The lens arrangement of variable curvature of the present invention is to utilize the first interior material layers of zoom lens and the material characteristic of second material layers, applies bias voltage, is beneficial to its curvature of modulation, and then reaches the effect of zoom and the good optical characteristic is provided.Moreover the configuration of the lens arrangement of variable curvature of the present invention can effectively be corrected aberration and be obtained the good quality of image.

Said modules, and further feature of the present invention and advantage, the content by reading embodiment and graphic after, will be more obvious.

Description of drawings

Fig. 1 a-Fig. 1 c is the lens arrangement synoptic diagram of variable curvature of the present invention according to the first embodiment of the present invention;

Fig. 1 d is the aberration diagram of the first embodiment of the present invention according to practical application numerical value;

Fig. 2 a-Fig. 2 c is the lens arrangement synoptic diagram of variable curvature of the present invention according to a second embodiment of the present invention;

Fig. 2 d is the aberration diagram of the second embodiment of the present invention according to practical application numerical value;

Fig. 3 a-Fig. 3 c a third embodiment in accordance with the invention is the lens arrangement synoptic diagram of variable curvature of the present invention;

Fig. 3 d is the aberration diagram of the third embodiment of the present invention according to practical application numerical value;

Fig. 4 a-Fig. 4 c a fourth embodiment in accordance with the invention is the lens arrangement synoptic diagram of variable curvature of the present invention;

Fig. 4 d is the aberration diagram of the fourth embodiment of the present invention according to practical application numerical value;

Fig. 5 a-Fig. 5 c is the lens arrangement synoptic diagram of variable curvature of the present invention according to a fifth embodiment of the invention;

Fig. 5 d is the aberration diagram of the fifth embodiment of the present invention according to practical application numerical value;

Fig. 6 a-Fig. 6 c is the lens arrangement synoptic diagram of variable curvature of the present invention according to a sixth embodiment of the invention;

Fig. 6 d is the aberration diagram of the sixth embodiment of the present invention according to practical application numerical value;

Fig. 7 a-Fig. 7 c is the lens arrangement synoptic diagram of variable curvature of the present invention according to a seventh embodiment of the invention;

Fig. 7 d is the aberration diagram of the seventh embodiment of the present invention according to practical application numerical value;

Fig. 8 a-Fig. 8 c is the lens arrangement synoptic diagram of variable curvature of the present invention according to the eighth embodiment of the present invention;

Fig. 8 d is the aberration diagram of the eighth embodiment of the present invention according to practical application numerical value;

Fig. 9 a-Fig. 9 c is the lens arrangement synoptic diagram of variable curvature of the present invention according to the ninth embodiment of the present invention;

Fig. 9 d is the aberration diagram of the ninth embodiment of the present invention according to practical application numerical value;

Figure 10 a-Figure 10 c is the lens arrangement synoptic diagram of variable curvature of the present invention according to the tenth embodiment of the present invention;

Figure 10 d is the aberration diagram of the tenth embodiment of the present invention according to practical application numerical value;

Figure 11 a-Figure 11 c is the lens arrangement synoptic diagram of variable curvature of the present invention according to the 11st embodiment of the present invention;

Figure 11 d is the aberration diagram of the 11st embodiment of the present invention according to practical application numerical value;

Figure 12 a-Figure 12 c is the lens arrangement synoptic diagram of variable curvature of the present invention according to the 12nd embodiment of the present invention;

Figure 12 d is the aberration diagram of the 12nd embodiment of the present invention according to practical application numerical value;

Figure 13 a-Figure 13 c is the lens arrangement synoptic diagram of variable curvature of the present invention according to the 13rd embodiment of the present invention;

Figure 13 d is the aberration diagram of the 13rd embodiment of the present invention according to practical application numerical value;

Figure 14 a-Figure 14 c is the lens arrangement synoptic diagram of variable curvature of the present invention according to the 14th embodiment of the present invention;

Figure 14 d is the aberration diagram of the 14th embodiment of the present invention according to practical application numerical value;

Figure 15 is the curve distribution figure of the first to the 15 embodiment of the present invention and each focal length ratio.

[primary clustering symbol description]

L1 first lenticular unit

L2 second lenticular unit

L3 the 3rd lenticular unit

L4 the 4th lenticular unit

L5 the 5th lenticular unit

The L6 flat-plate lens

1 picture side

2 first screening glass

3a first material layers

3b second material layers

3 zoom lens

4 second screening glass

Embodiment

The present invention will cooperate its preferred embodiment and the diagram of enclosing to be specified in down.Should can be regarded as preferred embodiments all among the present invention and only be the usefulness of illustration, be not in order to restriction.Therefore the preferred embodiment in literary composition, the present invention also can be widely used among other embodiment.And the present invention is not limited to any embodiment, should be with the claim of enclosing and equivalent fields thereof and decide.

Fig. 1 to Figure 14 is respectively that the lens arrangement of variable curvature of the lens arrangement synoptic diagram of variable curvature of first embodiment to the, 14 embodiment and each embodiment is according to the pairing aberration diagram of real application data.

With reference to Fig. 1 a-Fig. 1 c to Figure 14 a-Figure 14 c, describe the lens arrangement synoptic diagram of each embodiment respectively, a, b in wherein graphic and c figure represent respectively with closely pattern (object distance A 〉=lower limit), normal mode (lower limit＜object distance A ≦ intermediate value) and the remote pattern (lens arrangement of the variable curvature of object distance A≤∞).

According to lens arrangement of the present invention,, extremely comprise in regular turn from the thing side: one first lenticular unit L1, one second lenticular unit L2, one the 3rd lenticular unit L3, one the 4th lenticular unit L4 and one the 5th lenticular unit L5 as side along an optical axis.In addition, have a focal length value be unlimited flat-plate lens L6 along optical axis, to picture side 1 direction, be disposed at the 5th lenticular unit L5 rear from the thing side.Preferably, flat-plate lens L6 can be infrared filter (IR filter), optical filter (OLPF) or cover glass sheet.The first lenticular unit L1 has negative diopter, and the convex surface of the first lenticular unit L1 is towards the thing side.The second lenticular unit L2 is an electric control zooming assembly, and wherein the second lenticular unit L2 can adjust the radius-of-curvature of its second lenticular unit L2, so that make with the radius-of-curvature of this lens arrangement of variable curvature, makes it be changed effective focal length.The 3rd lenticular unit L3 has positive diopter, and wherein the 3rd lenticular unit L3 is all convex surface towards the thing side and as the surface of side 1.The 4th lenticular unit L4 has negative diopter, and wherein the 4th lenticular unit L4 is a concave surface towards the surface as side 1.The 5th lenticular unit L5 has positive diopter, and wherein the convex surface of the 5th lenticular unit L5 is towards picture side 1.

The second lenticular unit L2 extremely comprises first screening glass (coverlens) 2, zoom lens 3 and second screening glass 4 as side 1 along optical axis in regular turn from the thing side.First screening glass 2 and second screening glass individually are covered in zoom lens 3 both sides along optical axis direction.Zoom lens 3 are made by one first material layers 3a and one second material layers 3b, change the curvature of zoom lens 3 according to the voltage of being applied to zoom lens 3, and then reach the effect of zoom and the good optical characteristic is provided.Moreover aberration and tool good optical characteristic can be effectively corrected in the configuration of the lens arrangement of change curvature of the present invention (radius).

The lens arrangement of variable curvature of the present invention has overcome the situation of conventional fixed focal length lens quality of image variation when close-perspective recording.The lens arrangement of variable curvature of the present invention utilizes above-mentioned electric control varifocal lens to change curvature, with tight shot when the difference photography object distance, with the form of micro-zoom carry out extremely near (object distance A〉5f, focal length variations when the effective focal length that the lens arrangement optics of variable curvature is) photography and infinite distance (object distance A=∞) photograph so will more can reach higher resolving power than fixed focus lens.In the preferred embodiment, the first lenticular unit L1 is sphere or non-spherical lens again, and the 3rd lenticular unit L3, the 4th lenticular unit L4 and the 5th lenticular unit L5 are the lens of aspheric surface.Lenticular unit L1, L3, L4, L5 all must be formed by material models such as plastics, glass, quartz, and preferred mode is to adopt plastics, and it more is minimized material cost compared to glass material.

Lens arrangement according to variable curvature provided by the present invention can satisfy the following relationship formula:

$0<|\frac{\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="A200810082508E00171.png,A200810082508E00173.png"\; state="\{\{state\}\}">f</figure-callout>}1}{\mathrm{fn}}-\frac{\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="A200810082508E00171.png,A200810082508E00173.png"\; state="\{\{state\}\}">f</figure-callout>}1}{\mathrm{fm}}|<0.12;$

$0<|\frac{\mathrm{fm}}{f2n}-\frac{\mathrm{fn}}{f2n}|<0.12;$

$0<|\frac{\mathrm{<figure-callout\; id="3"\; label="f"\; filenames="A200810082508E00171.png,A200810082508E00181.png"\; state="\{\{state\}\}">f</figure-callout>}3}{\mathrm{fm}}-\frac{\mathrm{<figure-callout\; id="3"\; label="f"\; filenames="A200810082508E00171.png,A200810082508E00181.png"\; state="\{\{state\}\}">f</figure-callout>}3}{\mathrm{fn}}|<0.1;$

$0<|\frac{\mathrm{<figure-callout\; id="4"\; label="f"\; filenames="A200810082508E00181.png,A200810082508E00201.png"\; state="\{\{state\}\}">f</figure-callout>}4}{\mathrm{fm}}-\frac{\mathrm{<figure-callout\; id="4"\; label="f"\; filenames="A200810082508E00181.png,A200810082508E00201.png"\; state="\{\{state\}\}">f</figure-callout>}4}{\mathrm{fn}}|<0.1;$

$0<|\frac{\mathrm{<figure-callout\; id="5"\; label="f"\; filenames="A200810082508E00181.png,A200810082508E00201.png"\; state="\{\{state\}\}">f</figure-callout>}5}{\mathrm{fm}}-\frac{\mathrm{<figure-callout\; id="5"\; label="f"\; filenames="A200810082508E00181.png,A200810082508E00201.png"\; state="\{\{state\}\}">f</figure-callout>}5}{\mathrm{fn}}|<0.2;$

(6)-2.7<f1/fn<0；

(7)0<f3/fn<0.85；

(8)-1<f4/fn<0；

(9)0<f5/fn<2.5；

Wherein

Fm: under first object distance (closely pattern) situation, the effective focal length of the lens arrangement of variable curvature (mm);

Fn: under second object distance (remote pattern) situation, the effective focal length of the lens arrangement of variable curvature (mm);

F2m: under first object distance (closely pattern) situation, the effective focal length of the lens arrangement of variable curvature (mm);

F2n: under second object distance (remote pattern) situation, the effective focal length of the lens arrangement of variable curvature (mm);

Fi: the effective focal length of i lens (mm);

F1: the effective focal length of first lenticular unit (mm);

F2: the effective focal length of second lenticular unit (mm);

F3: the effective focal length of the 3rd lenticular unit (mm);

F4: the effective focal length of the 4th lenticular unit (mm);

F5: the effective focal length of the 5th lenticular unit (mm).

Relational expression (1), (2), (3), (4), (5) are defined under the situation of first object distance (closely pattern) and second object distance (closely pattern), the effective focal length fm of the effective focal length fi of individual other lenticular unit and the lens arrangement of variable curvature, fn ratio poor limited the focus configuration and the refractive index of each lens by this.

With reference to Figure 15, for Figure 15 is the curve distribution figure of the first to the 15 embodiment of the present invention and each focal length ratio, by the curve distribution in graphic as can be known, among the first to the 14 embodiment of the present invention, each lenticular unit all satisfies above-mentioned relational expression.

With reference to Fig. 1 d-Figure 14 d, be the application parameter and the various aberration diagram of reality of the present invention.

Symbolic representation in the present invention is as follows:

FNO: burnt number;

FOV: total diagonal angle of view (2 ω);

A: object distance (mm);

B: radius-of-curvature from thing side the 5th surface in proper order;

Si: from the i surface of thing order;

Ri: the radius-of-curvature on i surface (mm);

Di: on the optical axis from the i surface of thing side order and the distance (mm) between the i+1 surface;

Ndi: the refractive index of i lens;

Vdi: the Abbe number of i lens (Abbe number);

It is between 40 °-90 ° that the scope at the lens arrangement visual angle (FOV) of above-mentioned variable curvature can contain from first embodiment to the, 14 embodiment.Among Fig. 1 d-Figure 14 d, each embodiment all has qualifier apart from the value range of A and from the value range (for example, among first embodiment, the value range of object distance A is between the 50mm-600mm-∞) of the radius-of-curvature B on the 5th surface of thing side order.

About the aberration diagram part of Fig. 1 d-Figure 14 d, be respectively spherical aberration, astigmatism and distort aberration diagram.Can learn that from above-mentioned aberration diagram aberration out of the ordinary is suitably to revise when the practical application.

The lens arrangement of variable curvature of the present invention has overcome the situation of conventional fixed focal length lens quality of image variation when close-perspective recording.The lens arrangement of variable curvature of the present invention utilizes above-mentioned zoom lens to change curvature, with tight shot when the difference photography object distance, with the form of micro-zoom come correspondence extremely near (object distance A〉5f, focal length variations when the effective focal length that the lens arrangement optics of variable curvature is) photography and infinite distance (object distance A=∞) photograph is so that make the better close-perspective recording effect of acquisition.

To being familiar with this field skill person, though the present invention illustrates as above with preferred embodiments, so it is not in order to limit spirit of the present invention.Modification of being done in not breaking away from spirit of the present invention and scope and similarly configuration all should be included in the following claim, and this scope should cover all similar modification and similar structures, and should do the broadest annotation.

Claims (10)

1. A lens structure with variable curvature, characterized in that, along an optical axis, from the object side to the image side, sequentially comprising: a first lens component having a negative diopter, and the convex surface of the first lens component faces the object side; a second lens component, which is an electronically controlled zoom assembly, wherein the second lens component can adjust the curvature of the second lens component so as to adjust the focal length of the variable curvature lens structure; A third lens component having a positive diopter, wherein the surfaces of the third lens component towards the object side and the image side are both convex; a fourth lens component having a negative power, wherein the surface of the fourth lens component facing the image side is concave; and a fifth lens component having positive diopter power, wherein the convex surface of the fifth lens component faces the image side; The variable curvature lens structure must satisfy the following relationship: (1) $0<|\frac{f1}{\mathrm{fn}}-\frac{f1}{\mathrm{fm}}|<0.12;$ (2) $0<|\frac{\mathrm{fm}}{f2\mathrm{no}}-\frac{\mathrm{fn}}{f2\mathrm{no}}|<0.12;$ (3) $0<|\frac{f3}{\mathrm{fm}}-\frac{f3}{f\mathrm{no}}|<0.1;$ (4) $0<|\frac{f4}{\mathrm{fm}}-\frac{f4}{f\mathrm{no}}|<0.1;$ (5) $0<|\frac{f5}{\mathrm{fm}}-\frac{f5}{f\mathrm{no}}|<0.2;$ (6)-2.7<f1/fn<0; (7) 0<f3/fn<0.85; (8)-1<f4/fn<0; (9) 0<f5/fn<2.5; Wherein, the focal length of the first lens component is f1, it is characterized in that the focal length of the third lens component is f3, the focal length of the fourth lens component is f4, and the focal length of the fifth lens component is f5; In the case of an object distance, the focal length of the variable curvature lens structure is fm, and the focal length of the second lens component is f2m; in the case of the second object distance, the focal length of the variable curvature lens structure is fn, and the first The focal length of the two lens components is f2n. 2. The variable curvature lens structure according to claim 1, wherein said second lens component comprises an electronically controlled zoom lens made of a first material layer and a second material layer, according to the A voltage applied to the zoom lens modulates the curvature of the zoom lens. 3. The variable-curvature lens structure according to claim 2, wherein the second lens component comprises a protection sheet and a second protection sheet respectively covering both sides of the zoom lens along the optical axis direction. 4. The variable curvature lens structure according to claim 1, wherein the first lens component is a spherical or aspheric lens. 5. The variable curvature lens structure of claim 1, wherein the third lens component is an aspheric lens. 6. The variable curvature lens structure of claim 1, wherein the fourth lens component is an aspheric lens. 7. The variable curvature lens structure of claim 1, wherein the fifth lens component is an aspheric lens. 8. The variable curvature lens structure according to claim 1, wherein the third lens component is a lens molded of plastic or glass material. 9. The variable curvature lens structure of claim 1, wherein the fourth lens component is a lens molded from plastic or glass. 10. The variable curvature lens structure according to claim 1, wherein the fifth lens component is a lens molded of plastic or glass material.

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