CN100485436C - Pick-up lens - Google Patents
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- CN100485436C CN100485436C CNB2005101094327A CN200510109432A CN100485436C CN 100485436 C CN100485436 C CN 100485436C CN B2005101094327 A CNB2005101094327 A CN B2005101094327A CN 200510109432 A CN200510109432 A CN 200510109432A CN 100485436 C CN100485436 C CN 100485436C
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Abstract
The present invention provides a compact imaging lens. The compact imaging lens comprises, from the object side to the image side, a diaphragm (2), a first positive meniscus lens (3) with a positive focal crescent shape which the convex surface of which facing the object side, and a second positive lens (4) the convex surface of which facing the image surface side, wherein following inequalities are satisfied 1.25>=L/fl>=0.8, 0.55>=f1/f2>=0.2, 1.8>=f1/fl>=1, 4>=f2/fl>=1.5, 1>=d2/d1>=0.5, 0.27>=d1/fl>=0.1, 0.27 >=d3/fl>=0.1 where, L: entire length of the lens system, Fl: focal distance of entire lens system, f1: focal distance of the first lens, f2: focal distance of the second lens, d1: center thickness of the first lens, d2: distance between the first lens and second lens on the optical axis, d3: center thickness of the second lens.
Description
Technical Field
The present invention relates to an imaging lens, and more particularly to an imaging lens including two lenses, which is used in an imaging device for forming an image of an object such as a landscape or a person on an imaging surface of a solid-state imaging device such as a CCD or a CMOS disposed in a notebook computer, a video telephone, or a mobile phone, and which can be reduced in size and weight and improved in optical performance and manufacturing performance.
Background
In recent years, there has been a significant increase in demand for video cameras using solid-state imaging devices such as CCDs and CMOSs that are disposed in, for example, mobile phones, notebook computers, and video phones. Such a camera needs to be disposed in a limited installation space, and therefore, is required to be small and light.
Therefore, the imaging lens used in such a camera is also required to be small and light, and a single lens system including one lens has been used as such an imaging lens.
Although such a single lens system can be applied to a solid-state imaging device called CIF having a resolution of about 11 ten thousand pixels, the use of a solid-state imaging device called VGA having a high resolution of about 30 ten thousand pixels has been studied in recent years, and there is a problem that the use of a conventional single lens system cannot satisfy the requirements in order to sufficiently exhibit the resolving power of such a high-resolution solid-state imaging device.
Therefore, various proposals have been made for a two-lens system composed of two lenses or a three-lens system composed of three lenses, which have superior optical performance compared to a single-lens system.
In this case, in the three-lens system, since each aberration associated with the deterioration of optical performance can be effectively corrected, although extremely high optical performance can be obtained, the three-lens system has problems in that: since the number of parts is large, it is difficult to reduce the size and weight, and the manufacturing cost is increased because the precision required for each component is high.
Accordingly, the two-lens system cannot be expected to have optical performance as that of the three-lens system, but can obtain optical performance higher than that of the single-lens system, and is suitable for a solid-state imaging device required to be small in size and high in resolution.
As such a two-lens system, many lens systems combining a negative lens and a positive lens, which are called a retrofocus type, have been proposed. However, such a retrofocus lens system can reduce the cost by reducing the number of parts, but since the back focal length is increased, it is substantially impossible from the structural viewpoint to achieve the same degree of downsizing and weight saving as that of the single lens system.
In addition, as another two-lens system, there is a lens system combining a negative lens and a positive lens called a telephoto type (teletype). However, such a telephoto lens system is originally developed for taking silver halide photographs, and has a problem that its back focal length (back focus distance) is too short and telecentricity (telecentricity) is also present, and it is difficult to directly use the system as an imaging lens for a solid-state imaging device.
Further, a configuration in which a diaphragm is disposed between two lenses adjacent in the optical axis direction in a two-lens system or a three-lens system has been mainstream at present (for example, see patent document 1-japanese patent application laid-open No. 2004-163850 and patent document 2-japanese patent application laid-open No. 2004-170460).
However, in recent years, there has been an increasing demand for further improvement in optical performance in addition to reduction in size and weight for such an imaging lens, and there has been a problem that it is difficult to achieve both reduction in size and weight and further improvement in optical performance by adopting a configuration in which a diaphragm is disposed between two lenses as in the imaging lens described in patent documents 1 and 2, and it is also difficult to match the characteristics of a sensor (the incident angle to the sensor).
Disclosure of Invention
The present invention has been made in view of the above problems, and an object thereof is to provide an imaging lens that can sufficiently satisfy the demands for reduction in size and weight and further improvement in optical performance, and can improve the manufacturing performance.
In the present specification, the manufacturing performance includes not only manufacturability in mass production of imaging lenses (for example, moldability and cost in mass production of imaging lenses by injection molding), but also easiness of processing and manufacturing of devices used for manufacturing imaging lenses (for example, easiness of processing of a metal mold used for injection molding).
In order to achieve the above object, an imaging lens according to a first aspect of the present invention is an imaging lens for forming an object image on an imaging surface of a solid-state imaging element, comprising: a diaphragm, a first lens which is a meniscus lens having a positive refractive power with a convex surface facing the object side, and a second lens which is a lens having a positive refractive power with a convex surface facing the image side, which are arranged in this order from the object side to the image side, and satisfy the following conditional expressions (1) - (7):
1.25≥L/f1≥0.8 (1)
1≥f1/f2≥0.55 (2)
1.8≥f1/f1≥1 (3)
4≥f2/f1≥1.5 (4)
1≥d2/d1≥0.5 (5)
0.27≥d1/f1≥0.1 (6)
0.27≥d3/f1≥0.1 (7)
wherein,
l: full length of lens system
f 1: focal length of the entire lens system
f1: focal length of the first lens
f2: focal length of the second lens
d1: center thickness of the first lens
d2: spacing of first and second lenses on optical axis
d3: center thickness of the second lens
Further, according to the invention of the first aspect, by disposing the diaphragm closest to the object side, it is possible to alleviate the incident angle of the light beam to the sensor of the solid-state imaging device while securing high telecentricity.
In the present invention, the portion near the optical axis of the surface (convex surface) closest to the object side and not interfering with the object side of the first lens is located closer to the object side than the diaphragm. In this case, the physical arrangement is such that the diaphragm is arranged closer to the object side than the entire first lens, and therefore does not violate the description of the first aspect.
Further, according to the invention of the first aspect, the first lens is a meniscus lens having a positive refractive power with the convex surface facing the object side, the second lens is a lens having a positive refractive power, and the refractive powers of the respective lenses satisfy the respective conditional expressions (1) to (7), whereby downsizing and weight saving can be achieved and the manufacturability can be improved.
An imaging lens system according to a second aspect of the present invention is the imaging lens system according to the first aspect, wherein the second lens is a meniscus lens.
According to the invention of the second aspect, the optical performance of the peripheral portion can be further improved without imposing a burden on the shapes of the first lens and the second lens, and the light rays incident on the peripheral portion of the solid-state imaging element can be more effectively utilized.
An image pickup lens according to a third aspect of the present invention is the image pickup lens according to the first aspect, wherein the object-side surface of the second lens is formed to be convex toward the object side in a portion near the optical axis, and is formed to be an aspherical surface having an inflection point.
According to the invention of the third aspect, the burden on each lens shape can be further reduced and the optical performance of the peripheral portion can be further improved, and the light rays incident on the peripheral portion of the solid-state imaging element can be more effectively utilized.
An image pickup lens according to a fourth aspect of the present invention is the image pickup lens according to the third aspect, wherein an outer end portion of an effective diameter of the object-side surface of the second lens is located closer to the object side than a point on the optical axis of the object-side surface of the second lens.
According to the invention of the fourth aspect, the optical performance of the peripheral portion can be further improved. Moreover, the handling of the lens is facilitated, and the assembly process when the lens is assembled into the lens barrel to form the assembly is also facilitated.
An imaging lens according to a fifth aspect of the present invention is the imaging lens according to any of the first to fourth aspects, wherein the diaphragm further satisfies the following conditional expression:
0.2≥S (8)
wherein, S: a distance between the aperture and an optical surface closest to the object side on the optical axis
According to the fifth aspect of the present invention, the telecentricity can be more effectively ensured and further reduction in size and weight can be achieved by satisfying the conditional expression (8).
An imaging lens system according to a sixth aspect of the present invention is the imaging lens system according to any one of the first to fifth aspects, further satisfying the following conditional expressions:
0.8≥Bf1/f1≥0.4 (9)
wherein, Bf 1: back focal length (distance on optical axis from final lens surface to image pickup surface (air converted length))
According to the sixth aspect of the present invention, by satisfying the conditional expression (9), it is possible to more effectively reduce the size and weight, and further improve the manufacturability and the ease of handling at the time of assembly.
An imaging lens system according to a seventh aspect of the present invention is the imaging lens system according to any one of the first to sixth aspects, further satisfying the following conditional expressions:
2.5≥Bf1≥1.2 (10)
according to the invention of the seventh aspect, by satisfying the conditional expression (10), it is possible to more effectively reduce the size and weight, and further improve the manufacturability and the ease of handling at the time of assembly.
An imaging lens system according to an eighth aspect of the present invention is the imaging lens system according to any one of the first to seventh aspects, further satisfying the following conditional expressions:
—0.5≥r4/f1≥—6.0 (11)
wherein r is4: the radius of curvature of the image surface side surface of the second lens.
According to the invention of the eighth aspect, by satisfying the conditional expression (11), the optical surface can be more easily processed, and various aberrations in the peripheral portion can be more favorably corrected.
The invention has the following effects:
according to the imaging lens of the first aspect of the present invention, it is possible to realize an imaging lens that is small and lightweight, has excellent optical performance, and has excellent manufacturing performance.
According to the imaging lens of the second aspect of the present invention, in addition to the effect of the imaging lens of the first aspect, it is possible to further improve the optical performance while maintaining the manufacturability well, and to realize an imaging lens of a small volume that can effectively use the light incident on the peripheral portion of the solid-state imaging element.
According to the imaging lens of the third aspect of the present invention, in addition to the effect of the imaging lens of the first aspect, it is possible to realize an imaging lens having a small volume which can more effectively utilize light incident on the peripheral portion of the solid-state imaging element while further exhibiting excellent optical performance while maintaining good manufacturability.
According to the imaging lens of the fourth aspect of the present invention, in addition to the effect of the imaging lens of the third aspect, it is possible to further optimize the optical performance while maintaining good manufacturability, and to realize an imaging lens of a small volume that can more effectively use light rays incident on the peripheral portion of the solid-state imaging element.
According to the imaging lens of the fifth aspect of the present invention, in addition to the effects of any one of the imaging lenses of the first to fourth aspects, it is possible to realize an imaging lens that can more effectively ensure telecentricity and is suitable for further reduction in size and weight.
According to the imaging lens of the sixth aspect of the present invention, in addition to the effect of any one of the imaging lenses of the first to fifth aspects, an imaging lens that is further compact and lightweight and has excellent manufacturing performance can be realized.
According to the imaging lens of the seventh aspect of the present invention, in addition to the effect of any one of the imaging lenses of the first to sixth aspects, it is possible to realize an imaging lens suitable for further reduction in size and weight and improvement in manufacturability.
According to the imaging lens of the eighth aspect of the present invention, in addition to the effects of any one of the imaging lenses of the first to seventh aspects, an imaging lens superior in optical performance and manufacturing performance can be realized.
Drawings
Fig. 1 is a schematic configuration diagram showing an embodiment of an imaging lens of the present invention.
Fig. 2 is a schematic configuration diagram showing a first embodiment of an imaging lens of the present invention.
Fig. 3 is an explanatory diagram showing spherical aberration, astigmatism, and distortion of the imaging lens shown in fig. 2.
Fig. 4 is a schematic configuration diagram showing a second embodiment of an imaging lens of the present invention.
Fig. 5 is an explanatory diagram showing spherical aberration, astigmatism, and distortion of the imaging lens shown in fig. 4.
Fig. 6 is a schematic configuration diagram showing a third embodiment of an imaging lens of the present invention.
Fig. 7 is an explanatory diagram showing spherical aberration, astigmatism, and distortion of the imaging lens shown in fig. 6.
Fig. 8 is a schematic configuration diagram showing a fourth embodiment of an imaging lens of the present invention.
Fig. 9 is an explanatory diagram showing spherical aberration, astigmatism, and distortion of the imaging lens shown in fig. 8.
Fig. 10 is a schematic configuration diagram showing a fifth embodiment of an imaging lens of the present invention.
Fig. 11 is an explanatory diagram showing spherical aberration, astigmatism, and distortion of the imaging lens shown in fig. 10.
In the figure:
1 pick-up lens, 2 diaphragm and 3 first lens
4 second lens 6 optical filter 7 image pick-up surface
Detailed Description
An embodiment of an imaging lens according to the present invention is described below with reference to fig. 1.
As shown in fig. 1, an imaging lens 1 of the present embodiment includes, in order from an object side to an image plane side, a diaphragm 2, a first lens 3 which is a resin meniscus lens having a positive refractive power with a convex surface facing the object side, and a second lens 4 which is a resin lens having a positive refractive power with a convex surface facing the image plane side.
Hereinafter, the lens surfaces of the first lens 3 and the second lens 4 on the object side and the image side are referred to as a first surface and a second surface, respectively.
On the second surface side of the second lens 4, various filters 6 such as cover glass, an IR cut filter, and a low-pass filter, and an imaging surface 7 which is a light receiving surface of an imaging element such as a CCD or a CMOS are arranged. The various filters 6 may be omitted as necessary.
Here, the closer the position of the diaphragm 2 is to the image plane side, the closer the exit pupil position is to the image plane side. Therefore, it is difficult to secure the telecentricity, and the off-axis light emitted from the imaging lens 1 is obliquely incident on the sensor of the solid-state imaging element.
In contrast, in the present embodiment, by disposing the diaphragm 2 closest to the object side, the exit pupil position can be set to a position away from the sensor surface (imaging surface) of the solid-state imaging device.
Therefore, in this embodiment, the incidence angle of light on the sensor of the solid-state imaging element can be relaxed while ensuring high telecentricity.
In the present embodiment, the diaphragm 2 is disposed on the object side of the first lens 3, and the first lens 3 is formed into a meniscus shape with the convex surface facing the object side, whereby the second surface of the first lens 3 can be effectively used.
That is, the degree of refraction of the second surface of the first lens 3 can be increased (correction effect) by making the off-axis light beam have an angle that changes sharply in a direction away from the optical axis 8 with respect to the normal line of the second surface of the first lens 3.
Therefore, various aberrations (particularly, coma and chromatic aberration) generated off-axis can be effectively corrected.
On the contrary, if the second surface of the first lens 3 is shaped such that the convex surface faces the image plane side, or if the diaphragm 2 is disposed closer to the image plane side than the first lens 3, the refractive index of the second surface of the first lens 3 cannot be increased, and the effect of correcting the various off-axis aberrations is very limited.
In addition, from the viewpoint of increasing the effect of correcting various off-axis aberrations, it is more effective to make the second surface of the first lens 3 aspherical. In this case, it is preferable that the second surface of the first lens element 3 be an aspherical surface whose curvature increases with distance from the optical axis 8. Thus, the off-axis light beam can be made to have a more sharply changing angle with respect to the normal line of the second surface of the first lens 3 in the direction away from the optical axis 8, and the effect of correcting various aberrations occurring off-axis can be more effectively increased.
In the present embodiment, the second surface of the second lens 4 is formed so that the convex surface faces the image plane side, whereby the incident angle of the light beam on the sensor of the solid-state imaging device can be controlled more effectively while securing higher telecentricity. Further, the second surface of the second lens 4 is preferably formed into an aspherical surface whose curvature increases with distance from the optical axis 8. Thus, the incidence angle of the light beam on the sensor of the solid-state imaging device can be controlled more effectively while ensuring high telecentricity.
In the present embodiment, the imaging lens 1 satisfies the following conditional expressions (1) to (7).
1.25≥L/f1≥0.8 (1)
1.0≥f1/f2≥0.55 (2)
1.8≥f1/f1≥1.0 (3)
4.0≥f2/f1≥1.5 (4)
1.0≥d2/d1≥0.5 (5)
0.27≥d1/f1≥0.1 (6)
0.27≥d3/f1≥0.1 (7)
Where L in the formula (1) is the total length of the lens system, that is, the physical optical distance from the surface closest to the object side to the image pickup surface. More specifically, when the portion near the optical axis 8 of the first surface of the first lens 3 is located closer to the image plane side than the diaphragm 2, the distance from the diaphragm 2 to the image pickup plane is L. On the other hand, as described above, when the portion near the optical axis 8 of the first surface of the first lens 3 is located closer to the object side than the diaphragm 2 by the diaphragm 2, the distance from the first surface of the first lens 3 to the imaging surface, not the diaphragm 2, is L. Further, f1 in the formulae (1), (3), (4), (6) and (7) is the focal length of the entire lens system. Further, f in the formulae (2) and (3)1Is the focal length of the first lens 3. And f in the formulae (2) and (4)2Is the focal length of the second lens 4. In addition, d in the formulae (5) and (6)1Is the central thickness of the first lens 3. Furthermore, d in the formula (5)2Is the spacing between the first lens 3 and the second lens 4 on the optical axis 8. Also, d in the formula (7)3Is the central thickness of the second lens 4.
Here, if the value of L/f1 is larger than the value (1.25) expressed by expression (1), the volume of the entire optical system becomes too large, and the demand for reduction in size and weight is violated. On the other hand, if the value of L is less than the value (0.8) shown in formula (1), since the volume of the entire optical system is too small, the manufacturability is degraded and it is difficult to maintain the optical performance thereof.
Therefore, according to the present embodiment, by satisfying the conditional expression (1) for the value of L/f1, the entire optical system can be sufficiently reduced in size and weight while securing the necessary back focal length, and the manufacturability can be improved while maintaining good optical performance.
Further, the relationship between L and f1 is more preferably 1.2. gtoreq.L/f 1. gtoreq.1.1.
In addition, if f1/f2If the value of (2) is larger than the value (1.0) shown in the formula (2), the optical focus of the second lens 4 becomes too strong, which results in a reduction in the productivity, and the back focus becomes too long, which makes it difficult to achieve a reduction in size and weight. On the other hand, if f1/f2If the value of (2) is less than the value (0.55) represented by the formula (2), the manufacturability of the first lens 3 is reduced, and it is difficult to secure the required back focal length.
Therefore, according to the present embodiment, by further increasing f1/f2The value of (2) satisfies the conditional expression (2), and the optical system can be further reduced in size and weight while the necessary back focal length is more effectively ensured.
In addition, f is1And f2More preferably 1.0. gtoreq.f1/f2≥0.6。
Furthermore, if f1If the value of/f 1 is larger than the value expressed by expression (3) (1.8), the back focal length becomes too long, and it becomes difficult to achieve a small and light weight. On the other hand, if f1If the value of/f 1 is smaller than the value (1.0) represented by formula (3), the manufacturability of the first lens is reduced.
Therefore, according to the present embodiment, by further increasing f1The value of/f 1 satisfies the conditional expression (3), and further, the reduction in size and weight and the improvement in manufacturability can be achieved.
In addition, f is1More preferably, the relationship with f1 is 1.7. gtoreq.f1/f1≥1.3。
Also, if f2If the value of/f 1 is larger than the value (4.0) expressed by the expression (4), the manufacturability of the first lens 3 is reduced, and it is difficult to secure the required back focal length. On the other hand, if f2If the value of/f 1 is smaller than the value (1.5) expressed by the formula (4), the optical power of the second lens is too strong, and the productivity is deteriorated.
Therefore, according to the present embodiment, by further increasing f2If the value of/f 1 satisfies the conditional expression (4), the required back focal length can be further appropriately secured, and the manufacturability can be further improved.
Furthermore, f is2More preferably, the relationship with f1 is 2.4. gtoreq.f2/f1≥1.5。
In addition, if d2/d1If the value of (2) is greater than the value (1.0) expressed by the expression (5), the refractive powers of the first lens 3 and the second lens 4 must be increased, and it becomes difficult to manufacture the lenses 3 and 4. Further, since the height of the light beam passing through the image surface side surface of the second lens 4 is increased, the power of the aspherical surface is increased, and the manufacturing is more difficult. On the other hand, if d2/d1Is larger than the value (0.5) shown in the expression (5), since the center thickness of the first lens 3 is relatively thick, it is difficult to secure the back focal length and insert an aperture that can effectively restrict the light flux.
Therefore, according to the present embodiment, d is further increased2/d1If the value of (5) satisfies the conditional expression, the manufacturability can be further improved, the necessary back focal length can be further appropriately secured, and the optical performance can be further favorably maintained.
In addition, d is2And d1More preferably 0.9. gtoreq.d2/d1≥0.5。
Furthermore, if d1If the value of/f 1 is larger than the value expressed by the formula (6) (0.27), the total length of the optical system becomes too long, and it becomes difficult to achieve reduction in size and weight. On the other handIf d is1If the value of/f 1 is smaller than the value (0.1) expressed by the formula (6), it becomes difficult to manufacture the first lens 3.
Therefore, according to the present embodiment, d is further increased1If the value of/f 1 satisfies the conditional expression (6), the reduction in size and weight and the improvement in manufacturability can be further achieved.
In addition, d is1More preferably, the relationship of f1 is 0.25. gtoreq.d1/f1≥0.15。
Furthermore, if d3If the value of/f 1 is larger than the value expressed by the formula (7) (0.27), the total length of the optical system becomes too long, and it becomes difficult to achieve reduction in size and weight. On the other hand, if d3If the value of/f 1 is smaller than the value (0.1) expressed by the formula (7), the second lens 4 is difficult to manufacture.
Therefore, according to the present embodiment, d is further increased3If the value of/f 1 satisfies the conditional expression (7), the entire optical system can be further reduced in size and weight, and the manufacturability can be further improved.
In addition, d is3More preferably, the relationship of f1 is 0.25. gtoreq.d3/f1≥0.15。
In addition to the above-described configuration, it is more preferable that the second lens 4 is a meniscus lens.
Thus, the optical performance of the peripheral portion can be improved without imposing a burden on the shapes of the first lens 3 and the second lens 4, and the light incident on the peripheral portion of the solid-state imaging element can be more effectively utilized.
Further, it is more preferable that the first surface of the second lens 4 is a convex surface facing the object side in the vicinity of the optical axis 8, and is formed into an aspherical surface having an inflection point.
Here, the inflection point of the first surface of the second lens 4 is a point where the sign of the inclination of a tangent line that is tangent to a curve (curve in cross section) of the first surface of the second lens 4 changes in a cross section of the second lens 4 taken along the cross section including the optical axis 8.
Therefore, as described above, when the center portion of the first surface of the second lens 4 is a convex surface facing the object side, the peripheral portion surrounded by the center portion of the first surface is bounded by an inflection point, and the surface shape thereof is changed to a concave surface facing the object side.
Thus, the optical performance of the peripheral portions can be further improved without imposing a burden on the shape of each lens 3, 4, and the light rays passing through the peripheral portions of each lens 3, 4 can be more effectively utilized.
Further, the surface shape of the first surface of the second lens 4 may be formed so that a plurality of inflection points sequentially appear from the optical axis 8 toward the peripheral side. In such a case, various aberrations can be corrected more favorably.
In addition to the above configuration, it is preferable that the outer end portion of the effective diameter of the first surface of the second lens 4 is located closer to the object side than a point on the optical axis 8 of the first surface of the second lens.
Thus, the optical performance of the peripheral portion can be further improved. Further, not only handling of the lens but also an assembly process when assembling the lens into the lens barrel to form a component are facilitated.
In addition to the above configuration, it is more preferable that the diaphragm 2 satisfy the following conditional expression (8).
Where S in equation (8) is a distance between the diaphragm 2 on the optical axis 8 and the optical surface closest to the object side, that is, a distance between the diaphragm 2 on the optical axis 8 and the first surface of the first lens 3. S is a physical distance, and the diaphragm 2 can be located closer to either the object side or the image plane side than a point on the optical axis 8 of the first surface of the first lens 3.
0.2≥S (8)
Thus, the telecentricity can be more effectively ensured, and the reduction in size and weight can be further achieved.
Further, the value of S is more preferably 0.15. gtoreq.S.
In addition to the above structure, it is more preferable that the conditional expression shown in the following (9) is satisfied.
Where Bf1 in equation (9) is the back focus, that is, the distance (air-converted length) from the lens final surface (the second surface of the second lens 4) to the optical axis 8 of the imaging surface 7.
0.8≥Bf1/f1≥0.4 (9)
This makes it possible to more effectively reduce the size and weight, and to further improve the manufacturability and ease of assembly.
Further, the relationship between Bf1 and f1 is more preferably 0.7. gtoreq.Bf 1/f 1. gtoreq.0.5.
In addition to the above structure, it is more preferable that the conditional expression shown in the following (10) is satisfied.
2.5≥Bf1≥1.2 (10)
This makes it possible to more effectively reduce the size and weight, and to further improve the manufacturability and ease of assembly.
Moreover, it is more preferable that Bf1 be 2.0. gtoreq.Bf 1. gtoreq.1.3.
In addition to the above structure, it is more preferable that the conditional expression shown in the following (11) is satisfied.
Wherein, in the formula (11), r4Is the radius of curvature of the second face of the second lens 4.
—0.5≥r4/f1≥—6.0 (11)
Thus, the optical surface can be more easily processed, and various aberrations in the peripheral portion can be more favorably corrected.
In addition, the r4More preferably, the relationship with f1 is-0.7. gtoreq.r4/f1≥—1.2。
In addition to the above-mentioned structure, it is more preferable that f1 satisfy the conditional expression 5.0. gtoreq.f 1. gtoreq.2.0 (more preferably 3.5. gtoreq.f 1. gtoreq.2.0).
This makes it possible to form a structure more suitable for a lens for a camera module disposed in a portable terminal or the like.
The resin material used to form the first lens 3 and the second lens 4 may have any composition as long as it is a material having transparency usable for molding optical parts, such as propylene, polycarbonate, and amorphous polyolefin resin, but from the viewpoint of further improving the production efficiency and further reducing the production cost, it is preferable to unify the resin materials of the two lenses 3 and 4 into the same resin material. Examples
An embodiment of the present invention will be described with reference to fig. 2 to 11.
In the present embodiment, Fno denotes an F part, and r denotes a radius of curvature of an optical surface (radius of curvature of the center in the case of a lens). And d represents the distance to the next optical surface. Nd represents a refractive index of each optical system when d-line (yellow) is irradiated, and vd represents an abbe number of each optical system when the same d-line is irradiated.
k. A, B, C, D represents each coefficient in the following equation (12). That is, when the direction of the optical axis 8 is a Z axis, the direction orthogonal to the optical axis 8 is an X axis, the propagation direction of light is positive, k is a conic coefficient, A, B, C, D is an aspherical coefficient, and r is a radius of curvature, the aspherical shape of the lens is expressed by the following equation.
Z(X)＝r-1X2/[1+{1—(k+1)r-2X2}1/2]+AX4+BX6+CX8+DX10 (12)
First embodiment
Fig. 2 shows a first embodiment of the present invention, and in this embodiment, similarly to the imaging lens 1 having the configuration shown in fig. 1, a diaphragm 2 is disposed on the object side of the first surface of the first lens 3, and a cover glass as an optical filter 6 is disposed between the second surface of the second lens 4 and the imaging surface 7. Further, the first surface of the first lens 3 is located closer to the object side than the diaphragm 2 by the diaphragm 2.
The imaging lens 1 of the first embodiment is set to the following conditions.
Lens data
L＝2.92mm、f1＝4.09mm、f1＝4.09mm、f2＝4.37mm、d1＝0.50mm、d2＝0.30mm、d3＝0.55mm、r4＝—2.564mm、Fno＝2.8
Number of face r d nd vd
(things point)
1 (first lens first surface) 0.7690.5001.52556.0
2 (second lens second surface) 0.9300.300
3 (second lens first surface) 20.0000.5501.52556.0
4 (second lens second surface) -2.5640.000
5 (cover glass first side) 0.0000.3001.51664.0
6 (cover glass second side) 0.000
(image plane)
The diaphragm 2 is disposed 0.1mm closer to the image plane side than a point on the optical axis 8 of the first surface of the first lens 3.
Number of face k A B C D
1 -3.77E-2 4.70E-2 -2.40E-1 1.60E -2.20E
2 -1.00E 4.16E-1 3.65E-1 4.30E 0
3 1.17E+2 -2.06E-1 -4.88E-2 -2.00E 0
4 8.29E 7.15E-2 -3.80E-1 5.74E-1 -6.93E-1
Under such conditions, L/f1 is 1.13, and the formula (1) is satisfied. And f1/f20.94, the formula (2) is satisfied. Furthermore, f1And/f 1 is 1.59, and satisfies the formula (3). Further, f2And/f 1 is 1.69, and satisfies the formula (4). And d2/d10.60, formula (5) is satisfied. And, d1And/f 1 is 0.19, and satisfies the formula (6). Also, d3And/f 1 is 0.21, and satisfies the formula (7). And S is 0.1mm, satisfying the formula (8). Further, Bf1/f1 is 0.61, and satisfies expression (9). If Bf1 is 1.57mm, the formula (10) is satisfied. Furthermore, r4And/f 1 is-0.63, and satisfies the formula (11).
Fig. 3 shows the spherical aberration, astigmatism, and distortion of the imaging lens 1 according to the first embodiment.
From the results, it was found that: as a result, the requirements for spherical aberration, astigmatism, and distortion can be basically satisfied, and sufficient optical characteristics can be obtained.
Second embodiment
Fig. 4 shows a second embodiment of the present invention, and in this embodiment, similarly to the imaging lens 1 having the configuration shown in fig. 1, a diaphragm 2 is disposed on the object side of the first surface of the first lens 3, and a cover glass as an optical filter 6 is disposed between the second surface of the second lens 4 and the imaging surface 7.
The imaging lens 1 of the second embodiment is set to the following conditions.
Lens data
L＝3.60mm、f1＝3.11mm、f1＝4.39mm、f2＝6.82mm、d1＝0.75mm、d2＝0.403mm、d3＝0.75mm、r4＝—15.152mm、Fno＝3.2
Number of face r d nd vd
(things point)
1 (first lens first surface) 1.0550.7501.53156.0
2 (first lens second surface) 1.4530.403
3 (second lens first surface) 4.6750.7501.53156.0
4 (second lens second surface) -15.1520.000
5 (cover glass first side) 0.0000.3001.51664.0
6 (cover glass second side) 0.000
(image plane)
The diaphragm 2 is disposed 0.1mm closer to the object side than a point on the optical axis 8 of the first surface of the first lens 3.
Number of face k A B C D
1 -2.17E-1 1.56E-2 -1.00E-1 5.47E-1 -5.26E-1
2 2.45E -6.65E-2 -6.95E-2 -1.38E-1 8.61E-1
3 0 -7.91E-2 -5.26E-1 1.06E -1.67E
4 -1.20E+4 -4.25E-2 5.83E-3 -8.12E-2 1.71E-2
Under such conditions, L/f1 becomes 1.16, and satisfies expression (1). And f1/f20.64, the formula (2) is satisfied. Furthermore, f1And/f 1 is 1.41, and satisfies the formula (3). Further, f2And/f 1 is 2.19, and satisfies the formula (4). And d2/d10.54, the formula (5) is satisfied. And, d1And/f 1 is 0.24, and satisfies the formula (6). Also, d3And/f 1 is 0.24, and satisfies the formula (7). And S is 0.0mm, satisfying the formula (8). Note that B f1/f1 is 0.51, and satisfies expression (9). Further, B f1 is 1.6mm, and satisfies the formula (10). Furthermore, r4And/f 1 is-4.872, and satisfies the formula (11).
Fig. 5 shows the spherical aberration, astigmatism, and distortion of the imaging lens 1 according to the second embodiment.
From the results, it was found that: as a result, the requirements for spherical aberration, astigmatism, and distortion can be basically satisfied, and sufficient optical characteristics can be obtained.
Third embodiment
Fig. 6 shows a third embodiment of the present invention, and in this embodiment, similarly to the imaging lens 1 having the configuration shown in fig. 1, a diaphragm 2 is disposed on the object side of the first surface of the first lens 3, and a cover glass as an optical filter 6 is disposed between the second surface of the second lens 4 and the imaging surface 7. Further, the first surface of the first lens 3 is located closer to the object side than the diaphragm 2 by the diaphragm 2.
The imaging lens 1 of the third embodiment is set to the following conditions.
Lens data
L＝2.88mm、f1＝2.53mm、f1＝3.50mm、f2＝5.21mm、d1＝0.5mm、d2＝0.35mm、d3＝0.55mm、r4＝—2.60mm、Fno＝2.8
Number of face r d nd vd
(things point)
1 (first lens first surface) 0.8000.5001.53156.0
2 (first lens second surface) 1.1000.350
3 (second lens first face) -40.0000.5501.53156.0
4 (second lens second surface) -2.6000.000
5 (cover glass first side) 0.0000.3001.51664.0
6 (cover glass second side) 0.000
(image plane)
The diaphragm 2 is disposed 0.1mm closer to the image plane side than a point on the optical axis 8 of the first surface of the first lens 3.
Number of face k A B C D
1 -1.78E-1 9.23E-3 8.98E-1 -4.15E 9.03E
2 2.86E 4.36E-2 -7.07E-1 2.59E -1.11E
3 -2.44E+5 -2.37E-1 8.13E-2 -2.15E 0
4 -9.15E+1 -2.99E-1 3.02E-1 -4.45E-1 -3.77E-2
Under such conditions, L/f1 becomes 1.14, and satisfies expression (1). And f1/f20.67, formula (2) is satisfied. Furthermore, f1And/f 1 is 1.38, and satisfies the formula (3). Further, f2And/f 1 is 2.06, and satisfies the formula (4). And d2/d10.70, the formula (5) is satisfied. And, d1And/f 1 is 0.20, and satisfies the formula (6). Also, d3And/f 1 is 0.22, and satisfies the formula (7). And S is 0.10mm, satisfying the formula (8). Note that B f1/f1 is 0.58, and satisfies expression (9). Further, B f 1mm is 1.48mm, and satisfies the formula (10). Furthermore, r4And/f 1 is-1.03, and satisfies the formula (11).
Fig. 7 shows the spherical aberration, astigmatism, and distortion of the imaging lens 1 according to the third embodiment.
From the results, it was found that: as a result, the requirements for spherical aberration, astigmatism, and distortion can be basically satisfied, and sufficient optical characteristics can be obtained.
Fourth embodiment
Fig. 8 shows a fourth embodiment of the present invention, and in this embodiment, similarly to the imaging lens 1 having the configuration shown in fig. 1, a diaphragm 2 is disposed on the object side of the first surface of the first lens 3, and a cover glass as an optical filter 6 is disposed between the second surface of the second lens 4 and the imaging surface 7.
The imaging lens 1 of the fourth embodiment is set to the following conditions.
Lens data
L＝3.78mm、f1＝3.17mm、f1＝4.71mm、f2＝5.72mm、d1＝0.65mm、d2＝0.45mm、d3＝0.65mm、r4＝—2.667mm、Fno＝3.2
Number of face r d nd vd
(things point)
1 (first lens first surface) 1.0530.6501.53156.0
2 (first lens second surface) 1.4290.450
3 (second lens first face) -20.0000.6501.53156.0
4 (second lens second surface) -2.6670.000
5 (cover glass first side) 0.0000.3001.51664.0
6 (cover glass second side) 0.000
(image plane)
The diaphragm 2 is disposed at the same position on the optical axis 8 as a point on the optical axis 8 of the first surface of the first lens 3.
Number of face k A B C D
1 -1.48E-1 3.77E-2 -2.08E-1 7.68E-1 -1.58E-1
2 3.77E -3.21E-2 -5.45E-1 7.24E-1 -2.15E-1
3 -2.44E+5 -2.25E-1 1.39E-1 -8.12E-1 0
4 -1.07E+2 -3.36E-1 3.80E-1 -4.02E-1 8.88E-2
Under such conditions, L/f1 becomes 1.19, and satisfies expression (1). And f1/f2When the average molecular weight is 0.82, the formula (2) is satisfied. Furthermore, f1And/f 1 is 1.49, and satisfies the formula (3). Further, f2And/f 1 is 1.80, and satisfies the formula (4). And d2/d10.69, the formula (5) is satisfied. And, d1And/f 1 is 0.21, and satisfies the formula (6). Also, d3And/f 1 is 0.21, and satisfies the formula (7). And S is 0.0mm, fullIt is sufficient to have the formula (8). Further, Bf1/f1 is 0.61, and satisfies expression (9). If Bf1 is 1.93mm, the formula (10) is satisfied. Furthermore, r4And/f 1 is-0.841, satisfying the formula (11).
Fig. 9 shows spherical aberration, astigmatism, and distortion of the imaging lens 1 according to the fourth embodiment.
From the results, it was found that: as a result, the requirements for spherical aberration, astigmatism, and distortion can be basically satisfied, and sufficient optical characteristics can be obtained.
Fifth embodiment
Fig. 10 shows a fifth embodiment of the present invention, and in this embodiment, similarly to the imaging lens 1 having the configuration shown in fig. 1, a diaphragm 2 is disposed on the object side of the first surface of the first lens 3, and a cover glass as an optical filter 6 is disposed between the second surface of the second lens 4 and the imaging surface 7.
The imaging lens 1 of the fifth embodiment is set to the following conditions.
Lens data
L＝3.16mm、f1＝2.78mm、f1＝3.85mm、f2＝5.73mm、d1＝0.55mm、d2＝0.38mm、d3＝0.60mm、r4＝—2.860mm、Fno＝2.8
Number of face r d nd vd
(things point)
1 (first lens first surface) 0.8800.5501.53156.0
2 (first lens second surface) 1.2100.380
3 (second lens first face) -44.0000.6001.53156.0
4 (second lens second surface) -2.8600.000
5 (cover glass first side) 0.0000.3001.51664.0
6 (cover glass second side) 0.000
(image plane)
The diaphragm 2 is disposed 0.1mm closer to the image plane side than a point on the optical axis 8 of the first surface of the first lens 3.
Number of face k A B C D
1 -1.48E-1 6.93E-3 5.57E-1 -2.13E 3.83E
2 2.86E 3.27E-2 -4.39E-1 1.33E -4.69E-1
3 -2.44E+5 -1.78E-1 5.05E-2 -1.10E 0
4 -9.15E+1 -2.25E-1 1.88E-1 -2.28E-1 -1.60E-2
Under such conditions, L/f1 becomes 1.14, and satisfies expression (1). And f1/f20.67, formula (2) is satisfied. Furthermore, f1And/f 1 is 1.38, and satisfies the formula (3). Further, f2And/f 1 is 2.06, and satisfies the formula (4). And d2/d10.69, the formula (5) is satisfied. And, d1And/f 1 is 0.20, and satisfies the formula (6). Also, d3And/f 1 is 0.22, and satisfies the formula (7). And S is 0.10mm, satisfying the formula (8). Note that B f1/f1 is 0.59, and satisfies expression (9). Further, B f1 is 1.63mm, and satisfies the formula (10). Furthermore, r4And/f 1 is-1.028, and satisfies formula (11).
Fig. 11 shows spherical aberration, astigmatism, and distortion of the imaging lens 1 according to the fifth embodiment.
From the results, it was found that: as a result, the requirements for spherical aberration, astigmatism, and distortion can be basically satisfied, and sufficient optical characteristics can be obtained.
The present invention is not limited to the above-described embodiments, and various modifications may be made as necessary.
For example, a light flux control plate may be disposed between the second surface of the first lens 3 and the first surface of the second lens 4 as necessary.
Claims (8)
1. An imaging lens for forming an object image on an imaging surface of a solid-state imaging element, characterized in that:
a diaphragm, a first lens which is a meniscus lens having a positive refractive power with a convex surface facing the object side, and a second lens which is a lens having a positive refractive power with a convex surface facing the image side, are arranged in this order from the object side to the image side, and satisfy the following conditional expressions (1) - (7):
1.25≥L/f1≥0.8 (1)
1≥f1/f2≥0.55 (2)
1.8≥f1/f1≥1 (3)
4≥f2/f1≥1.5 (4)
1≥d2/d1≥0.5 (5)
27≥d1/f1≥0.1 (6)
27≥d3/f1≥0.1 (7)
wherein,
l: full length of lens system
f 1: focal length of the entire lens system
f1: focal length of the first lens
f2: focal length of the second lens
d1: center thickness of the first lens
d2: spacing of first and second lenses on optical axis
d3: center thickness of the second lens
2. The imaging lens according to claim 1, characterized in that:
the second lens is a meniscus lens.
3. The imaging lens according to claim 1, characterized in that:
the object side surface of the second lens is formed to be convex toward the object side in the vicinity of the optical axis and formed to be an aspherical surface having an inflection point.
4. The imaging lens according to claim 3, characterized in that:
the outer end portion of the effective diameter of the object-side surface of the second lens is located closer to the object side than a point on the optical axis of the object-side surface of the second lens.
5. The imaging lens according to any one of claims 1 to 4, characterized in that:
the diaphragm also satisfies the following conditional expression:
2≥S (8)
wherein, S: a distance between the aperture and an optical surface closest to the object side on the optical axis.
6. The imaging lens according to claim 1, characterized in that:
the following conditional expressions are also satisfied:
8≥Bf1/f1≥0.4 (9)
wherein, Bf 1: the back focal length, which is the distance on the optical axis from the final lens surface to the imaging surface, is an air-equivalent length.
7. The imaging lens according to claim 1, characterized in that:
the following conditional expressions are also satisfied:
2.5≥Bf1≥1.2 (10)
wherein, Bf 1: the back focus, which is the distance on the optical axis from the final lens surface to the image pickup surface, is an air-converted length and has a unit of mm.
8. The imaging lens according to claim 1, characterized in that:
the following conditional expressions are also satisfied:
—0.5≥r4/f1≥—6.0 (11)
wherein r is4: the radius of curvature of the image surface side surface of the second lens.
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| CN101937124B (en) * | 2009-06-30 | 2013-01-30 | 比亚迪股份有限公司 | An optical lens assembly |
| CN103299228B (en) * | 2010-09-28 | 2016-02-10 | 亚太光电股份有限公司 | Lens Modules for Imaging |
| US9354424B2 (en) | 2010-09-28 | 2016-05-31 | AO Ether Corporation | Lens module for image capture |
| CN105549182A (en) * | 2016-02-19 | 2016-05-04 | 南京昂驰光电科技有限公司 | Novel miniature optical lens set |
| CN105572846A (en) * | 2016-02-19 | 2016-05-11 | 南京昂驰光电科技有限公司 | Novel micro optical lens |
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| CN1451987A (en) * | 2002-04-16 | 2003-10-29 | 柯尼卡株式会社 | Small camera lens, camera unit and portable terminal provided with them |
| CN1506707A (en) * | 2002-12-06 | 2004-06-23 | ���ֹɷݹ�˾ | Camera lens |
| CN1515950A (en) * | 2002-10-28 | 2004-07-28 | ���Ῠ���ܴ�ع���ʽ���� | Photographic lens, photographic unit and portable terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1451987A (en) * | 2002-04-16 | 2003-10-29 | 柯尼卡株式会社 | Small camera lens, camera unit and portable terminal provided with them |
| CN1515950A (en) * | 2002-10-28 | 2004-07-28 | ���Ῠ���ܴ�ع���ʽ���� | Photographic lens, photographic unit and portable terminal |
| CN1506707A (en) * | 2002-12-06 | 2004-06-23 | ���ֹɷݹ�˾ | Camera lens |
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