CN113640972A - Miniaturized high-resolution fixed-focus optical system and image pickup device - Google Patents
Miniaturized high-resolution fixed-focus optical system and image pickup device Download PDFInfo
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- CN113640972A CN113640972A CN202110911657.3A CN202110911657A CN113640972A CN 113640972 A CN113640972 A CN 113640972A CN 202110911657 A CN202110911657 A CN 202110911657A CN 113640972 A CN113640972 A CN 113640972A
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- G—PHYSICS
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- G02B13/00—Optical objectives specially designed for the purposes specified below
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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Abstract
The invention discloses a miniaturized high-resolution fixed-focus optical system and an image pickup device of the system, wherein the miniaturized high-resolution fixed-focus optical system comprises a lens; the lens is sequentially provided with a first lens group G1 with negative focal power and a second lens group G2 with positive focal power along the main optical axis of the lens from the object side to the image side; the first lens group G1 includes, in order from the object side to the image side, a positive lens L1, a negative lens L2, a negative lens L3, and a positive lens L4, and the object side surface of the negative lens L3 is a convex surface or a concave surface; the second lens group G2 includes, in order from the object side to the image side, a first cemented lens group B1 with positive optical power and a second cemented lens group B2 with positive optical power; the first cemented lens group B1 and the second cemented lens group B2 have at least one positive lens L7 therebetween. The composition of an optical system is realized through the first lens group G1 and the second lens group G2, the focal power of different lens groups is controlled, the position of the first lens group G1 relative to an imaging surface is unchanged in the focusing process, and the coexistence of small volume and high resolving power is realized.
Description
Technical Field
The present invention relates to the field of optical technology, and in particular, to a miniaturized high-resolution fixed-focus optical system and an image pickup apparatus.
Background
Nowadays, the requirements of the camera device on the resolution of the lens are higher and higher, and in order to obtain a larger angle of view and a better image, the chip size for monitoring face recognition and machine vision automatic judgment is larger. However, when a sensor with a larger size is used, the size of the lens tends to become larger, the cost is too high, and sufficient installation space is not necessarily provided in the camera. Further, industrial cameras currently used for machine vision processing are becoming higher in pixel, and there are modules on the market that require various use conditions, and some of these manufacturing apparatuses and substrate inspection apparatuses require lenses that have good image-capturing capability even at a short distance due to limitations in installation space.
Disclosure of Invention
The present invention is directed to a miniaturized high-resolution fixed-focus optical system and an image pickup apparatus, which solves one or more of the problems of the prior art and provides at least one of the advantages of the present invention.
The technical scheme adopted for solving the technical problems is as follows:
the invention provides a miniaturized high-resolution fixed-focus optical system, which comprises a lens; the first lens group G1 with negative focal power and the second lens group G2 with positive focal power are sequentially arranged along the main optical axis of the lens from the object side to the image side; the first lens group G1 includes, in order from an object side to an image side, a positive lens L1, a negative lens L2, a negative lens L3, and a positive lens L4, and an object-side surface of the negative lens L3 is a convex surface or a concave surface; the second lens group G2 includes, in order from the object side to the image side, a first cemented lens group B1 with positive optical power and a second cemented lens group B2 with positive optical power; at least one positive lens L7 is located between the first cemented lens group B1 and the second cemented lens group B2.
The invention has the beneficial effects that:
the structure is simplified, the composition of an optical system is realized through the first lens group G1 and the second lens group G2, the focal power of different lens groups is controlled, the position of the first lens group G1 relative to an imaging surface is unchanged in the focusing process, and the coexistence of small volume and high resolving power is realized. And in the second lens group G2, the color difference is improved and the volume of the focusing group is reduced by gluing a plurality of lenses. The amount of movement of the optically movable portion of the lens is small, and the influence of the vibration of the camera is reduced.
As a further improvement of the above technical solution, the first cemented lens group B1 includes a first lens L5, the first lens L5 is the most object side lens of the first cemented lens group B1, and the first lens L5 is a negative lens; the second cemented lens group B2 includes a second lens L9, the second lens L9 is an image plane side lens of the second cemented lens group B2, and the second lens L9 is a second negative lens.
When the most object side lens of the first cemented lens group B1 is a negative lens, the most image side lens of the cemented lens group B2 is also a negative lens.
As a further improvement of the above technical solution, the first cemented lens group B1 further includes a second lens L6, and the second lens L6 is a positive lens; the second cemented lens group B2 includes a first lens L8, the first lens L8 being a positive lens.
As a further improvement of the above technical solution, the first cemented lens group B1 includes a first lens L55, the first lens L55 is the most object side lens of the first cemented lens group B1, and the first lens L55 is a positive lens;
the second cemented lens group B2 includes a second lens L99, the second lens L99 is the most image plane side lens of the second cemented lens group B2, and the second lens L99 is a positive lens.
As a further improvement of the above technical solution, the first cemented lens group B1 further includes a second lens L66, and the second lens L66 is a negative lens; the second cemented lens group B2 includes a first lens L88, the first lens L88 being a negative lens.
As a further improvement of the above technical solution, the lens includes an effective diaphragm St, and the effective diaphragm St is disposed between the first lens group G1 and the second lens group G2.
In order to limit the light beam or limit the size of the field of view (imaging range), an effective diaphragm St is provided to optimize the shaping of the light beam and improve the quality of the light beam.
As a further improvement of the above technical solution, the effective diaphragm St is fixed or movable with respect to the imaging surface IMG, and the effective diaphragm St is set according to the actual requirement of the lens.
As a further improvement of the above technical solution, the lens satisfies the following conditional expression:
(1)1.625＜f2/EFL＜1.875；
(2)1.5＜f2/TL2；
(3)0.58＜nd3/(nd1+nd2)＜0.65；
(4)56＜vd2＜76；
wherein:
f 2: the combined focal distance of the second lens group G2;
EFL: a focal distance of the lens at infinity for focusing;
TL 2: the distance on the optical axis between the object side surface vertex and the image side surface vertex of the second lens group G2;
nd 1: the refractive index of the positive lens in the first cemented lens group B1; nd 2: the refractive index of the positive lens in the second cemented lens group B2; nd 3: the refractive index of positive lens L7 intermediate the first cemented lens group B1 and the second cemented lens group B2; vd 2: the average value of abbe numbers of all positive lenses in the second lens group G2.
As a further improvement of the technical proposal, (5)0.25 < TL34/TL 1; TL 1: the distance on the optical axis between the object side surface vertex and the image side surface vertex of the first lens group G1; TL 34: the lens L3 is spaced from the lens L4 on the optical axis.
The present invention also provides an image pickup apparatus including the miniaturized high-resolution focusing optical system of any one of the above and a solid-state image pickup element configured to receive light of an image formed by the miniaturized high-resolution focusing optical system.
The image pickup apparatus includes a small-sized fixed focus optical system having a high resolution.
Drawings
The invention is further described with reference to the accompanying drawings and examples;
fig. 1 is a schematic structural diagram of a first embodiment of a miniaturized high-resolution fixed-focus optical system provided by the present invention;
FIG. 2 is a schematic structural diagram of a second embodiment of a miniaturized high-resolution fixed-focus optical system according to the present invention;
FIG. 3 is a graph illustrating longitudinal aberration for a specific example of the embodiment of FIG. 1;
fig. 4 is a graph illustrating longitudinal aberration of a specific example of the embodiment of fig. 2.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, if words such as "a plurality" are described, the meaning is one or more, the meaning of a plurality is two or more, more than, less than, more than, etc. are understood as excluding the present number, and more than, less than, etc. are understood as including the present number.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1 to 4, a miniaturized high-resolution fixed-focus optical system and an image pickup device according to the present invention are provided as follows:
fig. 1 is a diagram of an embodiment of a miniaturized high-resolution fixed-focus optical system including a lens, in which the lens includes, in order from an object side to an image side along a main optical axis of the lens, a first lens group G1 having negative optical power, an effective stop St, and a second lens group G2 having positive optical power; the first lens group G1 includes, in order from an object side to an image side, a positive lens L1, a negative lens L2, a negative lens L3, and a positive lens L4, and an object-side surface of the negative lens L3 is a convex surface or a concave surface; the second lens group G2 includes, in order from the object side to the image side, a first cemented lens group B1 with positive optical power and a second cemented lens group B2 with positive optical power; at least one positive lens L7 is located between the first cemented lens group B1 and the second cemented lens group B2. The lens includes an effective stop St disposed between the first lens group G1 and the second lens group G2.
In order to limit the light beam or limit the size of the field of view (imaging range), an effective diaphragm St is provided to optimize the shaping of the light beam and improve the quality of the light beam. And the effective diaphragm St is fixed or movable relative to the imaging surface IMG, and the effective diaphragm St is set according to the actual need of the lens.
Wherein the first cemented lens group B1 includes a first lens L5 and a second lens L6 which are positive lenses, the first lens L5 is the most object side lens of the first cemented lens group B1, the first lens L5 is a negative lens, and the second lens L6 is a positive lens; the second cemented lens group B2 includes a second lens L9, the first lens L8 and the second lens L9 are the most image side lenses of the second cemented lens group B2, the second lens L9 is a negative lens, and the first lens L8 is a positive lens.
The lens in fig. 1 satisfies the following conditional expressions:
(1)1.625＜f2/EFL＜1.875；
(2)1.5＜f2/TL2；
(3)0.58＜nd3/(nd1+nd2)＜0.65；
(4)56＜vd2＜76；
(5)0.25＜TL34/TL1；
wherein:
f 2: the combined focal distance of the second lens group G2;
EFL: a focal distance of the lens at infinity for focusing;
TL 2: the distance on the optical axis between the object side surface vertex and the image side surface vertex of the second lens group G2;
nd 1: the refractive index of the positive lens in the first cemented lens group B1;
nd 2: the refractive index of the positive lens in the second cemented lens group B2;
nd 3: the refractive index of positive lens L7 intermediate the first cemented lens group B1 and the second cemented lens group B2;
vd 2: the average value of abbe numbers of all positive lenses in the second lens group G2.
TL 1: the distance on the optical axis between the object side surface vertex and the image side surface vertex of the first lens group G1;
TL 34: the lens L3 is spaced from the lens L4 on the optical axis.
Referring to fig. 2, another embodiment of the present invention is illustrated, wherein the first cemented lens group B1 includes a first lens L55 and a second lens L66, the first lens L55 is the most object side lens of the first cemented lens group B1, the first lens L55 is a positive lens, and the second lens L66 is a negative lens;
the second cemented lens group B2 includes a second lens L99 and a first lens L88, the second lens L99 is the lens on the most image plane side of the second cemented lens group B2, the second lens L99 is a positive lens, and the first lens L88 is a negative lens. The structure is simplified, the composition of an optical system is realized through the first lens group G1 and the second lens group G2, the focal power of different lens groups is controlled, the position of the first lens group G1 relative to an imaging surface is unchanged in the focusing process, and the coexistence of small volume and high resolving power is realized. And in the second lens group G2, the color difference is improved and the volume of the focusing group is reduced by gluing a plurality of lenses. The amount of movement of the optically movable portion of the lens is small, and the influence of the vibration of the camera is reduced.
The following is a specific example of a compact high-resolution fixed focus optical system of the embodiment shown in fig. 1.
| Noodle | Radius of curvature (mm) | Spacing (mm) | Refractive index | Abbe number |
| S1 | 20.69648 | 2.540365 | 1.883 | 40.8054 |
| S2 | 66.43175 | 0.2 | ||
| S3 | 14.19849 | 0.7 | 1.507786 | 77.8261 |
| S4 | 6.137377 | 2.430037 | ||
| S5 | 40.07641 | 0.7 | 1.95906 | 17.4713 |
| S6 | 7.221418 | 6.815757 | ||
| S7 | 23.9092 | 1.575056 | 1.958964 | 17.6171 |
| S8 | -44.1218 | 2.860772 | ||
| S9 | (diaphragm) | 6.593351 | ||
| S10 | -63.9216 | 0.7 | 1.956639 | 22.0794 |
| S11 | 19.56815 | 2.449411 | 1.496997 | 81.6084 |
| S12 | -13.0776 | 0.2 | ||
| S13 | 35.66206 | 1.928139 | 1.883 | 40.8054 |
| S14 | -33.6086 | 0.2 | ||
| S15 | 17.41931 | 2.738023 | 1.500247 | 80.4133 |
| S16 | -17.0985 | 0.7 | 1.773825 | 23.5496 |
| S17 | -601.726 | 12.40927 | ||
| S18 | Infinity(s) | - | - | - |
Fig. 3 shows an aberration diagram of a miniaturized high-resolution fixed-focus optical system according to an example of the embodiment shown in fig. 1. As is apparent from these aberration diagrams, the aberration of the miniaturized high-resolution fixed-focus optical system of the example of the embodiment shown in fig. 1 is corrected well, and the performance is good. Wherein the separation distance refers to the separation of the two faces on the primary optical axis.
The following is a specific example of a compact high-resolution fixed focus optical system of the embodiment shown in fig. 2.
| Noodle | Radius of curvature (mm) | Spacing (mm) | Refractive index | Abbe number |
| S1 | 17.332 | 3.86 | 1.6968 | 55.5 |
| S2 | 104.232 | 0.20 | ||
| S3 | 16.561 | 0.70 | 1.5935 | 67.0 |
| S4 | 6.478 | 3.25 | ||
| S5 | -49.962 | 0.70 | 1.9591 | 17.5 |
| S6 | 8.461 | 4.80 | ||
| S7 | 22.690 | 3.40 | 1.9459 | 18.0 |
| S8 | -29.115 | 6.98 | ||
| S9 | (diaphragm) | 5.12 | ||
| S10 | -55.031 | 2.40 | 1.4970 | 81.6 |
| S11 | -6.977 | 0.70 | 1.9229 | 20.9 |
| S12 | -11.541 | 0.20 | ||
| S13 | 56.580 | 1.81 | 1.8348 | 42.7 |
| S14 | -31.460 | 0.20 | ||
| S15 | 16.198 | 0.70 | 1.7283 | 28.3 |
| S16 | 8.851 | 2.66 | 1.4970 | 81.6 |
| S17 | 234.499 | 13.06 | ||
| S18 | Infinity(s) | - | - | - |
Fig. 4 shows an aberration diagram of a miniaturized high-resolution fixed-focus optical system according to an example of the embodiment shown in fig. 2. As is apparent from these aberration diagrams, the aberration of the miniaturized high-resolution fixed-focus optical system of the example of the embodiment shown in fig. 2 is corrected well, and the performance is good.
The present invention also provides an image pickup apparatus including the miniaturized high-resolution focusing optical system of any one of the above and a solid-state image pickup element configured to receive light of an image formed by the miniaturized high-resolution focusing optical system. The image pickup apparatus includes a small-sized fixed focus optical system having a high resolution.
While the preferred embodiments of the present invention have been described in detail, it is to be understood that the invention is not limited to the precise embodiments, and that various equivalent changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A miniaturized high-resolution fixed-focus optical system is characterized by comprising a lens;
the first lens group G1 with negative focal power and the second lens group G2 with positive focal power are sequentially arranged along the main optical axis of the lens from the object side to the image side;
the first lens group G1 includes, in order from an object side to an image side, a positive lens L1, a negative lens L2, a negative lens L3, and a positive lens L4, and an object-side surface of the negative lens L3 is a convex surface or a concave surface;
the second lens group G2 includes, in order from the object side to the image side, a first cemented lens group B1 with positive optical power and a second cemented lens group B2 with positive optical power;
at least one positive lens L7 is located between the first cemented lens group B1 and the second cemented lens group B2.
2. A miniaturized high-resolution fixed-focus optical system as defined in claim 1, wherein:
the first cemented lens group B1 comprises a first lens L5, the first lens L5 being the most object side lens of the first cemented lens group B1, the first lens L5 being a negative lens;
the second cemented lens group B2 includes a second lens L9, the second lens L9 is the lens on the most image plane side of the second cemented lens group B2, and the second lens L9 is a negative lens.
3. A miniaturized high-resolution fixed-focus optical system as defined in claim 2, wherein:
the first cemented lens group B1 further comprises a second lens L6, the second lens L6 being a positive lens; the second cemented lens group B2 includes a first lens L8, the first lens L8 being a positive lens.
4. A miniaturized high-resolution fixed-focus optical system as defined in claim 1, wherein:
the first cemented lens group B1 comprises a first lens L55, the first lens L55 being the most object side lens of the first cemented lens group B1, the first lens L55 being a positive lens;
the second cemented lens group B2 includes a second lens L99, the second lens L99 is the most image plane side lens of the second cemented lens group B2, and the second lens L99 is a positive lens.
5. The miniaturized high-resolution fixed-focus optical system according to claim 4, wherein:
the first cemented lens group B1 further comprises a second lens L66, the second lens L66 being a negative lens; the second cemented lens group B2 includes a first lens L88, the first lens L88 being a negative lens.
6. A miniaturized high-resolution fixed-focus optical system as defined in claim 1, wherein:
the lens includes an effective stop St disposed between the first lens group G1 and the second lens group G2.
7. The miniaturized high-resolution fixed-focus optical system according to claim 6, wherein:
the lens comprises an imaging surface IMG against which the effective diaphragm St is fixed or movable.
8. A miniaturized high-resolution fixed-focus optical system as defined in claim 1, wherein:
the lens satisfies the following conditional expression:
(1)1.625＜f2/EFL＜1.875；
(2)1.5＜f2/TL2；
(3)0.58＜nd3/(nd1+nd2)＜0.65；
(4)56＜vd2＜76；
wherein:
f 2: the combined focal distance of the second lens group G2;
EFL: a focal distance of the lens at infinity for focusing;
TL 2: the distance on the optical axis between the object side surface vertex and the image side surface vertex of the second lens group G2;
nd 1: the refractive index of the positive lens in the first cemented lens group B1;
nd 2: the refractive index of the positive lens in the second cemented lens group B2;
nd 3: the refractive index of positive lens L7 intermediate the first cemented lens group B1 and the second cemented lens group B2;
vd 2: the average value of abbe numbers of all positive lenses in the second lens group G2.
9. A miniaturized high-resolution fixed-focus optical system as defined in claim 8, wherein:
(5)0.25＜TL34/TL1；
TL 1: the distance on the optical axis between the object side surface vertex and the image side surface vertex of the first lens group G1;
TL 34: the lens L3 is spaced from the lens L4 on the optical axis.
10. An image pickup apparatus comprising the miniaturized high-resolution focusing optical system according to any one of claims 1 to 9 and a solid-state image pickup element configured to receive light of an image formed by the miniaturized high-resolution focusing optical system.
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