CN209946512U - Optical imaging system and optical equipment - Google Patents
Optical imaging system and optical equipment Download PDFInfo
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- CN209946512U CN209946512U CN201921138862.5U CN201921138862U CN209946512U CN 209946512 U CN209946512 U CN 209946512U CN 201921138862 U CN201921138862 U CN 201921138862U CN 209946512 U CN209946512 U CN 209946512U
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Abstract
The utility model provides an optical imaging system, including the first lens subassembly, second lens subassembly, diaphragm and the third lens subassembly that set gradually, the optical axis coincidence of first lens subassembly, second lens subassembly, diaphragm and third lens subassembly, wherein, the light focus value of first lens subassembly is negative; the optical focal length value of the second lens component is positive; the diaphragm is used for adjusting the emergent light beam of the second lens assembly; the positions of the first lens assembly, the second lens assembly and the diaphragm are relatively fixed; the optical focal length value of the third lens component is positive, and the third lens component is movably arranged on the emergent light path of the diaphragm along the optical axis and used for adjusting the imaging quality. It can be seen that the use of the present invention can correct the chromatic aberration and aberration existing in the past wide-angle optical system, thereby improving the imaging quality.
Description
Technical Field
The utility model relates to the field of optical technology, particularly, relate to an optical imaging system and optical equipment.
Background
In recent years, wide-angle optical systems having a large field-of-view range image pickup capability and a large field-of-view range image projection capability are widely demanded among photographic optical systems for image pickup apparatuses (such as video cameras) and projection optical systems for image projection apparatuses (such as projectors). Among them, the conventional wide-angle optical system generally uses a reverse telescopic system having characteristics of a short focal distance, a large angle of view, a long rear intercept, and the like, and thus the reverse telescopic system is well known as a common wide-angle optical system. However, in practice it has been found that the wide angle optical systems described above typically have chromatic aberrations and aberrations, thereby affecting the imaging quality.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides an optical imaging system and an optical apparatus, which can correct chromatic aberration and aberration existing in the past wide-angle optical system, thereby improving imaging quality.
In order to achieve the above object, the utility model adopts the following technical scheme:
in a first aspect, the present invention provides an optical imaging system, comprising a first lens component, a second lens component, a diaphragm and a third lens component arranged in sequence, wherein optical axes of the first lens component, the second lens component, the diaphragm and the third lens component coincide, wherein,
the optical focal length value of the first lens component is negative;
the optical focal length value of the second lens component is positive;
the diaphragm is used for adjusting the emergent light beam of the second lens component;
the positions of the first lens assembly, the second lens assembly and the diaphragm are relatively fixed;
the optical focal length value of the third lens component is positive, and the third lens component can be movably arranged on the emergent light path of the diaphragm along the optical axis and is used for adjusting the imaging quality.
As an alternative embodiment, the diaphragm is an aperture diaphragm or a field diaphragm.
As an optional implementation, a ratio between the first focal length of the first lens component and the system focal length of the optical imaging system satisfies the following relation:
-2≤F1/F≤-1.5；
wherein F1 represents the focal length of the first lens assembly;
f denotes the focal length of the optical imaging system.
As an optional embodiment, the first lens component includes a plurality of negative lenses, and an average value of abbe numbers of the negative lenses satisfies the following relation:
40<υ1<70；
wherein ν 1 represents an average value of abbe numbers of the plurality of negative lenses.
As an optional implementation, the second lens component includes a positive lens, and the refractive index of the positive lens satisfies the following relation:
1.75<n2<1.95；
where n2 denotes the refractive index of the positive lens.
As an optional embodiment, the second lens component includes a positive lens, and an abbe number of the positive lens satisfies the following relation:
20<υ2<45；
where ν 2 denotes an abbe number of the positive lens.
As an optional implementation manner, a ratio between the third focal length of the third lens component and the system focal length of the optical imaging system satisfies the following relation:
1≤F3/F≤3；
wherein F3 represents the focal length of the third lens assembly;
f denotes the focal length of the optical imaging system.
As an optional embodiment, the third lens component includes a plurality of positive lenses, and an average value of abbe numbers of the positive lenses satisfies the following relation:
υ3>50；
wherein ν 3 represents an average value of abbe numbers of the plurality of positive lenses.
As an optional implementation manner, the third lens component includes a plurality of positive lenses, and an average value of the specific dispersion differences of the positive lenses satisfies the following relation:
θ>0.015；
where θ represents an average value of relative partial dispersion differences of the plurality of positive lenses.
In a second aspect, the present invention provides an optical apparatus including an image processing device and the optical imaging system of any one of the first aspect, wherein the image processing device is configured to receive and process an image captured by the optical imaging system.
According to the utility model provides a pair of optical imaging system and optical device can accomplish the regulation to the incident light through the cooperation that optical focal length value is first lens subassembly, optical focal length value of negative for positive second lens subassembly and diaphragm, and the step of formation of image is accomplished to the position that rethread adjustment optical focal length value is positive third lens subassembly to obtain the image that corresponds with the looks. Therefore, by implementing the optical imaging system, the imaging quality can be adjusted by adjusting the position of the third lens component, so that chromatic aberration and aberration (specifically, the aberration can be seidel five aberration) in the conventional wide-angle optical system can be well corrected, the imaging performance and the imaging quality are improved, and an excellent imaging effect is obtained.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention.
Fig. 1 is a schematic cross-sectional view of an optical imaging system according to a first embodiment of the present invention;
fig. 2 is a color spherical aberration graph of the optical imaging system when the object is at infinite distance according to the first embodiment of the present invention;
fig. 3 is an astigmatism and distortion diagram of an optical imaging system when an object is at infinite distance in a first embodiment of the invention;
fig. 4 is a schematic cross-sectional view of an optical imaging system according to a second embodiment of the present invention;
fig. 5 is a color spherical aberration diagram of an optical imaging system when an object is at an infinite distance according to a second embodiment of the present invention;
fig. 6 is an astigmatism and distortion diagram of an optical imaging system when an object is at infinite distance in a second embodiment of the invention;
fig. 7 is a schematic structural diagram of an optical device according to a third embodiment of the present invention.
Description of the main element symbols:
100-an optical imaging system; 110-a first lens assembly; 120-a second lens assembly; 121-positive lens in the second lens assembly; 130-a diaphragm; 140-a third lens assembly; 141-positive lens in the third lens assembly; 200-an image processing apparatus; 210-a lens barrel; 220-a housing; 221-fast return mirror; 222-a focusing screen; 223-pentagonal roof prism; 224-eyepiece lens; 225-image receiving element.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. In general, the components included in the embodiments of the present invention shown and described in the drawings may be arranged and designed in a variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the invention and its embodiments, and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in the present invention can be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, a fixed connection, a removable connection, or a unitary construction may be used; can be a mechanical connection, or a point connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Furthermore, the terms "first," "second," and the like, are used primarily to distinguish one device, element, or component from another (the specific nature and configuration may be the same or different), and are not used to indicate or imply the relative importance or number of the indicated devices, elements, or components. "plurality" means two or more unless otherwise specified.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
To the problem among the prior art, the utility model provides an optical imaging system and optical equipment can be for the cooperation of positive second lens subassembly and diaphragm through the light focus value, and the regulation to the incident light is accomplished to the cooperation of light focus value for negative first lens subassembly, light focus value, and the step of formation of image is accomplished to the position that rethread adjusted light focus value is positive third lens subassembly to obtain the image that corresponds with the looks. Therefore, by implementing the optical imaging system, the imaging quality can be adjusted by adjusting the position of the third lens component, so that chromatic aberration and aberration (specifically, the aberration can be seidel five aberration) in the conventional wide-angle optical system can be well corrected, the imaging performance and the imaging quality are improved, and an excellent imaging effect is obtained. The following is described by way of example.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Example 1
Referring to fig. 1, which is a schematic structural diagram of an optical imaging system 100 provided in this embodiment, the optical imaging system 100 includes a first lens assembly 110, a second lens assembly 120, a diaphragm 130, and a third lens assembly 140 that are sequentially disposed, optical axes of the first lens assembly 110, the second lens assembly 120, the diaphragm 130, and the third lens assembly 140 are overlapped, wherein,
the optical power value of the first lens assembly 110 is negative;
the optical power value of the second lens assembly 120 is positive;
the aperture 130 is used to adjust the exit beam of the second lens assembly 120;
the positions of the first lens assembly 110, the second lens assembly 120 and the diaphragm 130 are relatively fixed;
the optical power of the third lens assembly 140 is positive, and the third lens assembly 140 is movably disposed along the optical axis on the emergent light path of the stop 130 for adjusting the imaging quality.
In this embodiment, the setting directions are set in order from the object side to the image side.
In this embodiment, a first lens assembly 110 having negative optical power, a second lens assembly 120 having positive optical power, a diaphragm 130, and a third lens assembly 140 having positive optical power are arranged in this order from the object side. During the focusing process of the optical imaging system 100, the third lens assembly 140 can move along the optical axis, and the first lens assembly 110, the second lens assembly 120, and the diaphragm 130 are fixed with respect to the image plane.
By implementing such an embodiment, it is not necessary to move the diaphragm 130 while ensuring the entrance pupil position during the focusing process of the optical imaging system 100, thereby reducing the load on the focusing mechanism, which is beneficial to the miniaturization and weight reduction of the optical imaging system 100 and the optical apparatus having the optical imaging system 100.
In this embodiment, the focal power (focal power) is equal to the difference between the image-side and object-side beam convergence, which characterizes the ability of the optical system to deflect light rays.
In this embodiment, the light angle value of the first lens assembly 110 is negative, which means that the combined effect of all elements included in the first lens assembly 110 is the effect of diverging light.
In this embodiment, the light angle value of the second lens assembly 120 is positive, and it is understood that the combined effect of all the elements included in the second lens assembly 120 is the effect of converging light rays.
In this embodiment, the aperture 130 is used to adjust the brightness, the sharpness, and the magnitude of some aberrations of the image formed by the optical imaging system 100 according to the set position and size. Wherein, the smaller the light-passing hole of the diaphragm 130, the smaller the spherical aberration, the sharper the image, the larger the depth of field, but the weaker the brightness of the image; the larger the clear aperture, the brighter the image, but the larger the spherical aberration, the poorer the sharpness of the image, and the smaller the depth of field.
In this embodiment, the first lens assembly 110, the second lens assembly 120 and the diaphragm 130 are arranged such that the first lens assembly 110 preferentially disperses the incident object light, the second lens assembly 120 adjusts the emergent light path of the first lens assembly 110 for the first time, so as to complete the first processing of the object light, and the diaphragm 130 adjusts the emergent light path of the second lens assembly 120 for light transmission, so as to complete the pre-processing of the object light. So that the third lens assembly 140 can perform final adjustment on the pre-processed optical path by adjusting the position on the optical axis, thereby achieving adjustment of the imaging quality.
As an alternative embodiment, the diaphragm 130 may be an aperture diaphragm or a field diaphragm.
In a preferred embodiment, the diaphragm 130 is an aperture diaphragm.
Implementing this embodiment, the use of the aperture stop can better limit the imaging beam in the optical imaging system 100, thereby achieving better results.
As an alternative embodiment, the ratio between the first focal length of the first lens assembly 110 and the system focal length of the optical imaging system 100 satisfies the following relation:
-2≤F1/F≤-1.5；
wherein F1 denotes the focal length of the first lens assembly 110;
f denotes the focal length of the optical imaging system 100.
In this embodiment, the above relation can reduce the difficulty of implementing the requirements of short focal length and long back intercept by reasonably setting the optical focal length of the first lens element 110. When the focal power value exceeds the lower limit of the relationship, if the focal power value of the first lens assembly 110 is too small, the optical path length will increase, which is not favorable for the miniaturization of the optical system; when the power value exceeds the upper limit of the relationship, the power value of the first lens element 110 is too large, which may cause aberration that cannot be corrected by the second lens element 120 and the third lens element 140, thereby resulting in low imaging performance of the optical imaging system 100.
In the present embodiment, the power value may affect the thickness of the lenses included in the first lens assembly 110, the second lens assembly 120, and the third lens assembly 140, thereby affecting the usage change of the elements in the optical imaging system 100.
As an alternative embodiment, the first lens assembly 110 includes a plurality of negative lenses, and an average value of abbe numbers of the negative lenses satisfies the following relation:
40<υ1<70；
where ν 1 represents an average value of abbe numbers of the negative lenses.
In this embodiment, the above relational expression controls the chromatic aberration of position and the chromatic aberration of magnification of the optical system within a certain range by reasonably setting the abbe number sum of the negative lens material in the first lens element 110. If upsilon 1 exceeds the upper limit of the relational expression, the chromatic dispersion of the negative lens is too small, the correction of the chromatic aberration of magnification is insufficient, and the imaging performance of the system is low; if ν 1 exceeds the lower limit of the above relational expression, chromatic dispersion of the negative lens becomes too large, correction of chromatic aberration of magnification becomes excessive, and imaging performance of the system deteriorates.
As an alternative embodiment, the second lens component 120 includes a positive lens, and the refractive index of the positive lens satisfies the following relation:
1.75<n2<1.95；
where n2 denotes the refractive index of the positive lens.
As an alternative embodiment, the second lens assembly 120 includes a positive lens, and the abbe number of the positive lens satisfies the following relation:
20<υ2<45；
where ν 2 denotes an abbe number of the positive lens.
In this embodiment, the second lens assembly 120 includes a positive lens, wherein the number of the positive lenses is not limited in this embodiment, and the positive lens is the positive lens 121 in the second lens assembly 120.
In this example, the abbe number of the glass material was defined as vd ═ nd-1)/(nF-nC); wherein, the abbe number is an index for expressing the dispersion capability of the transparent medium; wherein nF, nd and nC are refractive indexes of the glass material at the wavelengths of F line (486.1nm), d line (587.6nm) and C line (656.3nm), respectively.
In this embodiment, the two relations can control the chromatic aberration of position and the chromatic aberration of magnification of the optical imaging system 100 within a certain range by reasonably setting the refractive index and abbe number of the positive lens material of the second lens element 120. If n2 exceeds the upper limit of the above relational expression, the focal power of the positive lens becomes too large, and the chromatic aberration of magnification moves in the positive direction, resulting in insufficient correction of chromatic aberration of magnification and poor peripheral imaging performance; if n2 exceeds the lower limit of the above relational expression, the refractive power of the positive lens becomes too small, and distortion moves in the negative direction, resulting in insufficient distortion correction and poor peripheral image forming performance.
In this embodiment, if ν 2 exceeds the upper limit of the above relational expression, the dispersion of the positive lens material is too small, and the correction of the positional chromatic aberration is insufficient, resulting in a decrease in the central imaging performance. If ν 2 exceeds the lower limit of the above relational expression, chromatic dispersion of the positive lens material becomes excessively large, correction of positional chromatic aberration becomes excessive, and central imaging performance becomes low.
As an alternative embodiment, the ratio between the third focal length of the third lens assembly 140 and the system focal length of the optical imaging system 100 satisfies the following relation:
1≤F3/F≤3；
wherein F3 denotes the focal length of the third lens assembly 140;
f denotes the focal length of the optical imaging system 100.
In this embodiment, the above relation can more easily realize the requirements of short focal length and long back intercept by reasonably setting the focal power of the third lens component 140. If F3/F exceeds the lower limit of the above relational expression, the focal power of the third lens unit 140 (focusing lens unit) is too large, which is disadvantageous for realizing a long rear focal length on the premise of a large aperture, and thus cannot satisfy the use of the optical apparatus. If F3/F exceeds the upper limit of the above relational expression, the focal power of the focusing lens unit becomes too small, which is disadvantageous in downsizing the optical system.
As an alternative embodiment, the third lens assembly 140 includes a plurality of positive lenses, and an average value of abbe numbers of the positive lenses satisfies the following relation:
υ3>50；
where ν 3 represents an average value of abbe numbers of the plurality of positive lenses.
As an alternative embodiment, the third lens assembly 140 includes a plurality of positive lenses, and the average value of the specific dispersion difference of the positive lenses satisfies the following relation:
θ>0.015；
where θ represents an average value of relative partial dispersion differences of the positive lenses.
In this embodiment, the third lens assembly 140 includes a plurality of positive lenses, and the positive lenses are the positive lenses 141 in the third lens assembly 140.
In this embodiment, the partial dispersion ratio θ is defined as (ng-nf)/(nf-nc), where θ is the relative dispersion between g light and f light.
In this example, the abbe number of a general glass material is inversely proportional to the partial dispersion ratio, and the relational expression thereof is-1.61783 × 10 ═ θ-3X υ d-0.64146. When the material has abnormal dispersion characteristics, the difference between the value of the partial dispersion ratio and the standard line drawn on the glass diagram is called the partial dispersion ratio difference Δ θ, and the relation is expressed as Δ θ +1.61783 × 10-3×υd-0.64146。
In this embodiment, the above relation between θ and ν 3 can control the chromatic positional aberration and chromatic aberration of magnification of the optical imaging system 100 within a certain range by appropriately setting the abbe number and the specific partial dispersion difference of the glass material of the third lens element 140 (positive lens in the focusing group). If υ 3 exceeds the lower limit of the relation, the dispersion of the positive lens is too large, and the variation of the C line and the F line relative to the d line is large in the focusing process, so that the imaging performance of the optical imaging system 100 is low; if υ 3 exceeds the upper limit of the above relational expression, the above situation is reversed.
In this embodiment, if θ exceeds the lower limit of the above relation, the partial dispersion ratio of the positive lens is too small, the secondary spectrum is insufficiently corrected, and the change of g-line is large during the focusing process, resulting in low imaging performance of the system; if θ exceeds the upper limit of the above relational expression, the above situation is reversed.
In the present embodiment, the following tables 1 and 2 show various numerical data regarding the optical imaging system 100 of the present embodiment:
wherein, f is 33.95 mm; fno 1.44; 2 ω 66.6 °;
table 1 is the basic data of the optical imaging system 100:
TABLE 1
Table 2 shows aspheric data of the optical imaging system 100 including:
| Si | K | C4 | C6 | C8 | C10 |
| 3 | +0.00 | +1.41422E-06 | +3.35215E-09 | -7.69523E-13 | +1.49447E-15 |
| 4 | +0.00 | -5.74375E-06 | -4.78079E-09 | +4.54553E-13 | -1.77806E-14 |
| 20 | +0.00 | -3.06454E-06 | -9.90207E-10 | +8.83867E-12 | -1.19048E-14 |
| 21 | +0.00 | +3.60267E-06 | -7.26017E-10 | +2.16954E-11 | -1.99441E-14 |
TABLE 2
It should be noted that the specific parameters in the above table are merely exemplary, and the parameters of each lens are not limited to the values shown in the above numerical embodiments, and other values may be adopted to achieve similar technical effects.
Fig. 2 is a color spherical aberration diagram of the optical system of the embodiment in the present embodiment when the object is at an infinite distance, and the value without the unit of establishment is defaulted to millimeter.
Fig. 3 is an astigmatism and distortion diagram of the optical system of the embodiment in the present embodiment when the object is at an infinite distance, with values without a unit of establishment being defaulted to millimeters.
Fig. 2 and 3 are aberration diagrams illustrating the optical imaging system 100 according to the present embodiment at infinity focus (β ═ 0.0). Referring to FIG. 2, in the diagram of spherical aberration, a solid line, a broken line and a dashed line represent spherical aberration at a d-line (wavelength 587.6nm), a c-line (wavelength 656.3nm), a g-line (wavelength 435.8 nm); fig. 3 is a schematic diagram illustrating astigmatism and distortion.
As an alternative embodiment, the optical imaging system 100 may also include parallel glass plates configured with a filter; wherein the parallel glass plate is disposed between the third lens assembly 140 and the image surface.
In this embodiment, the back intercept is the distance from the image side surface of the third lens assembly 140 to the image surface, where the parallel glass plates can be considered as air.
It can be seen that, implementing the schematic cross-sectional view of the optical imaging system 100 shown in fig. 1, an optical imaging system 100 can be provided to achieve high-performance imaging performance by reasonably setting the focal power of the lens assembly and reasonably selecting the optical glass material in addition to meeting the requirements of large field angle and long back intercept, so as to correct the positional chromatic aberration and the chromatic aberration of magnification while correcting the negative distortion of the reverse telescopic system; further, chromatic aberration and aberration existing in the conventional wide-angle optical system can be corrected, thereby improving the imaging quality.
Example 2
Referring to fig. 4, which is a schematic cross-sectional view of an optical imaging system 100 provided in this embodiment, the optical imaging system 100 includes a first lens assembly 110, a second lens assembly 120, a diaphragm 130, and a third lens assembly 140 that are sequentially disposed, optical axes of the first lens assembly 110, the second lens assembly 120, the diaphragm 130, and the third lens assembly 140 are overlapped, wherein,
the optical power value of the first lens assembly 110 is negative;
the optical power value of the second lens assembly 120 is positive;
the aperture 130 is used to adjust the exit beam of the second lens assembly 120;
the positions of the first lens assembly 110, the second lens assembly 120 and the diaphragm 130 are relatively fixed;
the optical power of the third lens assembly 140 is positive, and the third lens assembly 140 is movably disposed along the optical axis on the emergent light path of the stop 130 for adjusting the imaging quality.
In this embodiment, the setting directions are set in order from the object side to the image side.
In this embodiment, a first lens assembly 110 having negative optical power, a second lens assembly 120 having positive optical power, a diaphragm 130, and a third lens assembly 140 having positive optical power are arranged in this order from the object side. During the focusing process of the optical imaging system 100, the third lens assembly 140 can move along the optical axis, and the first lens assembly 110, the second lens assembly 120, and the diaphragm 130 are fixed with respect to the image plane.
By implementing such an embodiment, it is not necessary to move the diaphragm 130 while ensuring the entrance pupil position during the focusing process of the optical imaging system 100, thereby reducing the load on the focusing mechanism, which is beneficial to the miniaturization and weight reduction of the optical imaging system 100 and the optical apparatus having the optical imaging system 100.
In this embodiment, the focal power (focal power) is equal to the difference between the image-side and object-side beam convergence, which characterizes the ability of the optical system to deflect light rays.
In this embodiment, the light angle value of the first lens assembly 110 is negative, which means that the combined effect of all elements included in the first lens assembly 110 is the effect of diverging light.
In this embodiment, the light angle value of the second lens assembly 120 is positive, and it is understood that the combined effect of all the elements included in the second lens assembly 120 is the effect of converging light rays.
In this embodiment, the aperture 130 is used to adjust the brightness, the sharpness, and the magnitude of some aberrations of the image formed by the optical imaging system 100 according to the set position and size. Wherein, the smaller the light-passing hole of the diaphragm 130, the smaller the spherical aberration, the sharper the image, the larger the depth of field, but the weaker the brightness of the image; the larger the clear aperture, the brighter the image, but the larger the spherical aberration, the poorer the sharpness of the image, and the smaller the depth of field.
In this embodiment, the first lens assembly 110, the second lens assembly 120 and the diaphragm 130 are arranged such that the first lens assembly 110 preferentially disperses the incident object light, the second lens assembly 120 adjusts the emergent light path of the first lens assembly 110 for the first time, so as to complete the first processing of the object light, and the diaphragm 130 adjusts the emergent light path of the second lens assembly 120 for light transmission, so as to complete the pre-processing of the object light. So that the third lens assembly 140 can perform final adjustment on the pre-processed optical path by adjusting the position on the optical axis, thereby achieving adjustment of the imaging quality.
As an alternative embodiment, the diaphragm 130 may be an aperture diaphragm or a field diaphragm.
In a preferred embodiment, the diaphragm 130 is an aperture diaphragm.
Implementing this embodiment, the use of the aperture stop can better limit the imaging beam in the optical imaging system 100, thereby achieving better results.
As an alternative embodiment, the ratio between the first focal length of the first lens assembly 110 and the system focal length of the optical imaging system 100 satisfies the following relation:
-2≤F1/F≤-1.5；
wherein F1 represents the focal length of the first lens assembly 110;
f denotes the focal length of the optical imaging system 100.
As an optional embodiment, the first lens assembly 110 includes a plurality of negative lenses, and an average value of abbe numbers of the negative lenses satisfies the following relation:
40<υ1<70；
wherein ν 1 represents an average value of abbe numbers of the plurality of negative lenses.
As an alternative embodiment, the second lens component 120 includes a positive lens, and the refractive index of the positive lens satisfies the following relation:
1.75<n2<1.95；
where n2 denotes the refractive index of the positive lens.
As an alternative embodiment, the second lens component 120 includes a positive lens, and the abbe number of the positive lens satisfies the following relation:
20<υ2<45；
where ν 2 denotes an abbe number of the positive lens.
As an alternative embodiment, the ratio between the third focal length of the third lens assembly 140 and the system focal length of the optical imaging system 100 satisfies the following relation:
1≤F3/F≤3；
wherein F3 represents the focal length of the third lens assembly 140;
f denotes the focal length of the optical imaging system 100.
As an alternative embodiment, the third lens assembly 140 includes a plurality of positive lenses, and an average value of abbe numbers of the positive lenses satisfies the following relation:
υ3>50；
wherein ν 3 represents an average value of abbe numbers of the plurality of positive lenses.
As an alternative embodiment, the third lens assembly 140 includes a plurality of positive lenses, and an average value of the specific dispersion differences of the positive lenses satisfies the following relation:
θ>0.015；
where θ represents an average value of relative partial dispersion differences of the plurality of positive lenses.
In this embodiment, the explanation of the above-mentioned optional embodiments is the same as that described in embodiment 1, and details thereof will not be repeated.
In the present embodiment, the following tables 3 and 4 show various numerical data regarding the optical imaging system 100 of the present embodiment:
wherein, f is 33.95 mm; fno 1.44; 2 ω 66.6 °;
the table 3 is basic data of the optical imaging system 100:
TABLE 3
Table 4 shows aspheric data of the optical imaging system 100 including:
| Si | K | C4 | C6 | C8 | C10 |
| 3 | +0.00 | -2.46317E-06 | -2.02523E-09 | -4.66253E-12 | -5.11906E-15 |
| 22 | +0.00 | -6.20141E-06 | -5.52331E-10 | -3.17505E-12 | -7.45125E-16 |
TABLE 4
It should be noted that the specific parameters in the above table are merely exemplary, and the parameters of each lens are not limited to the values shown in the above numerical embodiments, and other values may be adopted to achieve similar technical effects.
Fig. 5 is a color spherical aberration diagram of the optical system of the embodiment in the present embodiment when the object is at an infinite distance, and the value without the unit of establishment is defaulted to millimeter.
Fig. 6 is an astigmatism and distortion diagram of the optical system of the embodiment in the present embodiment when the object is at an infinite distance, with values without a unit of establishment being defaulted to millimeters.
Fig. 5 and 6 are aberration diagrams illustrating the optical imaging system 100 according to the present embodiment at infinity focus (β ═ 0.0). Referring to FIG. 5, in the diagram of spherical aberration, a solid line, a broken line and a dashed line represent spherical aberration at a d-line (wavelength 587.6nm), a c-line (wavelength 656.3nm), a g-line (wavelength 435.8 nm); fig. 6 is a schematic diagram illustrating astigmatism and distortion.
As an alternative embodiment, the optical imaging system 100 may also include parallel glass plates configured with a filter; wherein the parallel glass plate is disposed between the third lens assembly 140 and the image surface.
In this embodiment, the back intercept is the distance from the image side surface of the third lens assembly 140 to the image surface, where the parallel glass plates can be considered as air.
It can be seen that, by implementing the schematic cross-sectional view of the optical imaging system 100 shown in fig. 4, an optical imaging system 100 can be provided to achieve high-performance imaging performance by reasonably setting the focal power of the lens assembly and reasonably selecting the optical glass material in addition to meeting the requirements of large field angle and long back intercept, so as to correct the positional chromatic aberration and the chromatic aberration of magnification while correcting the negative distortion of the reverse telescopic system; further, chromatic aberration and aberration existing in the conventional wide-angle optical system can be corrected, thereby improving the imaging quality.
Example 3
Fig. 7 is a schematic structural diagram of an optical device according to this embodiment. Wherein the optical apparatus includes an image processing device 200 and the optical imaging system 100 described in the above-mentioned embodiment 1 or embodiment 2, wherein the image processing device 200 is configured to receive and process an image taken by the optical imaging system 100, and wherein the optical imaging system 100 is held by a lens barrel 210 as a holding member.
As shown in fig. 7, the image processing apparatus 200 includes a lens barrel 210, a quick return mirror 221 that reflects upward, and a focusing screen 222 disposed at an image forming position behind the quick return mirror 221. In addition, the image processing apparatus 200 further includes a pentagonal roof prism 223 that converts the inverted image formed on the focusing screen 222 into an erect image, and an eyepiece lens 224 that forms an enlarged erect image.
Among them, the image receiving element 225 may be a photosensitive surface of a solid-state image sensor (photoelectric conversion element) such as a CCD sensor or a CMOS sensor or a silver halide film; the image receiving element 225 is also a part of the image processing apparatus 200. During use of the optical device, quick return mirror 221 may be retracted to cause an image to be formed on image receiving element 225; the quick return mirror 221, the focusing screen 222, the pentagonal roof prism 223, the eyepiece lens 224, and the image receiving device 225 are disposed in the housing 220.
In this embodiment, the optical device may be a camera.
In the present embodiment, the optical imaging system 100 can be applied to a projector, a TV camera, and the like.
It can be seen that high performance imaging performance can be achieved with the optical device shown in fig. 7; further, chromatic aberration and aberration existing in the conventional wide-angle optical system can be corrected, thereby improving the imaging quality.
It is to be understood that, in the present embodiment, the optical system of the present invention and the optical apparatus having the optical system are described in detail based on the drawings. In the lens data, the refractive index and the focal length are values of d-line. In the optical lens related data, the unit of the length is mm, and the unit thereof will be omitted.
Among these, it is noted that the symbols used in the tables and the following description are as follows:
"Si" represents a surface number; "Ri" is the radius of curvature; "di" is the on-axis surface distance between the ith surface and the (i + 1) th surface; "nd" is the refractive index; "υ d" is the abbe number; "Fno" is the F number; "ω" is the half field angle. With respect to the surface number, "ASP" indicates that the surface is an aspherical surface, and with respect to the radius of curvature, "∞" indicates that the surface is a plane.
The lenses used in the numerical examples include some lenses having aspherical lens surfaces. Wherein the distance from the surface vertex in the direction of the optical axis (i.e., the rise Sag amount) is represented by x; the height in the direction perpendicular to the optical axis (i.e., the radial height) is represented by "y"; paraxial curvature (i.e., the inverse of the radius of curvature) at the apex of the lens is denoted by "c"; the taper constant is denoted by "k"; and the fourth, sixth, eighth and tenth-order aspherical coefficients are respectively represented by "C4", "C6", "C8" and "C10", and the aspherical shape is defined by the following expression:
it should be appreciated that reference throughout this specification to "in this embodiment," "in an embodiment of the present invention," or "as an alternative implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in various embodiments of the present invention. Thus, the appearances of the phrases "in this embodiment," "in an embodiment of the invention," or "as an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Those skilled in the art should also appreciate that the embodiments described in this specification are exemplary and alternative embodiments, and that the acts and modules illustrated are not required to practice the invention.
In the various embodiments of the present invention, it should be understood that the sequence numbers of the above-mentioned processes do not mean the execution sequence necessarily in order, and the execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An optical imaging system is characterized by comprising a first lens component, a second lens component, a diaphragm and a third lens component which are arranged in sequence, wherein the optical axes of the first lens component, the second lens component, the diaphragm and the third lens component are coincident, wherein,
the optical focal length value of the first lens component is negative;
the optical focal length value of the second lens component is positive;
the diaphragm is used for adjusting the emergent light beam of the second lens component;
the positions of the first lens assembly, the second lens assembly and the diaphragm are relatively fixed;
the optical focal length value of the third lens component is positive, and the third lens component can be movably arranged on the emergent light path of the diaphragm along the optical axis and is used for adjusting the imaging quality.
2. The optical imaging system of claim 1, wherein the diaphragm is an aperture diaphragm or a field diaphragm.
3. The optical imaging system of claim 1, wherein a ratio between the first focal length of the first lens assembly and the system focal length of the optical imaging system satisfies the following relationship:
-2≤F1/F≤-1.5；
wherein F1 represents the focal length of the first lens assembly;
f denotes the focal length of the optical imaging system.
4. The optical imaging system of claim 1, wherein the first lens assembly comprises a plurality of negative lenses, and an average of abbe numbers of the plurality of negative lenses satisfies the following relation:
40<υ1<70；
wherein ν 1 represents an average value of abbe numbers of the plurality of negative lenses.
5. The optical imaging system of claim 1, wherein the second lens assembly comprises a positive lens having a refractive index that satisfies the following relationship:
1.75<n2<1.95；
where n2 denotes the refractive index of the positive lens.
6. The optical imaging system of claim 1, wherein the second lens component comprises a positive lens having an abbe number satisfying the following relationship:
20<υ2<45；
where ν 2 denotes an abbe number of the positive lens.
7. The optical imaging system of claim 1, wherein a ratio between the third focal length of the third lens assembly and the system focal length of the optical imaging system satisfies the following relationship:
1≤F3/F≤3；
wherein F3 represents the focal length of the third lens assembly;
f denotes the focal length of the optical imaging system.
8. The optical imaging system of claim 1, wherein the third lens component comprises a plurality of positive lenses, and an average of abbe numbers of the plurality of positive lenses satisfies the following relation:
υ3>50；
wherein ν 3 represents an average value of abbe numbers of the plurality of positive lenses.
9. The optical imaging system of claim 1, wherein the third lens component comprises a plurality of positive lenses, and an average of the specific partial dispersion differences of the positive lenses satisfies the following relation:
θ>0.015；
where θ represents an average value of relative partial dispersion differences of the plurality of positive lenses.
10. An optical apparatus, characterized in that the optical apparatus comprises an image processing device and the optical imaging system of any one of claims 1 to 9, wherein the image processing device is used for receiving and processing images taken by the optical imaging system.
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