CN110941082A - Eyepiece optical system, electronic viewfinder and image pickup device - Google Patents
Eyepiece optical system, electronic viewfinder and image pickup device Download PDFInfo
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- CN110941082A CN110941082A CN201811105700.1A CN201811105700A CN110941082A CN 110941082 A CN110941082 A CN 110941082A CN 201811105700 A CN201811105700 A CN 201811105700A CN 110941082 A CN110941082 A CN 110941082A
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- lens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B25/00—Eyepieces; Magnifying glasses
- G02B25/001—Eyepieces
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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
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/63—Control of cameras or camera modules by using electronic viewfinders
Abstract
The present invention relates to an eyepiece optical system, an electronic viewfinder, and an image pickup apparatus, wherein light is imaged via the eyepiece optical system, the direction toward the eyes of an observer is an eye side, and the other side is a display side, the eyepiece optical system is provided with a first lens group having negative refractive power and a second lens group having positive refractive power in order from the eye side to the display side; the first lens group is fixed, and the second lens group can move along the optical axis direction. The eyepiece optical system has strong positive refractive power and high optical performance, and meanwhile, the first lens group is set to be a fixed structure, and the second lens group can move along the direction of an optical axis. Therefore, the electronic viewfinder with the eyepiece optical system has the characteristics of large view angle, high optical performance and small volume.
Description
Technical Field
The present invention relates to the optical field, and more particularly to an eyepiece optical system and an optical device using the eyepiece optical system, such as an electronic viewfinder including the eyepiece optical system and an image pickup apparatus mounted with the electronic viewfinder.
Background
Since the digital camera was on the field, the commercialization of a camera equipped with an EVF (electronic viewfinder) was started. The conventional OVF (optical viewfinder) directly observes an image of an object through an optical system, and the operational principle of the EVF is to convert an image captured by a main lens of a camera to a display of the EVF and observe the image of the display with naked eyes through the optical system.
Generally, in order to view a large image on the electronic viewfinder, so as to clearly see the details in the image, the electronic viewfinder must have a large viewing angle. However, in order to provide an electronic viewfinder with a large viewing angle, an eyepiece optical system having a strong positive refractive power is required. In such an eyepiece optical system, it is difficult to correct aberrations such as curvature of field and distortion. However, due to the influence of aberrations such as curvature of field and chromatic aberration of magnification, the optical resolution performance around the display is degraded. In addition, in an optical system having a strong positive refractive power, each lens is required to have a strong positive refractive power or a strong negative refractive power, and thus, when the lens is slightly shifted or tilted perpendicularly to the optical axis, the resolving performance around the imaging area of the optical system is greatly affected, that is, the decentering sensitivity tends to be increased.
In the current cameras on the market, due to the size control, both the viewing angle and the optical performance of the electronic viewfinder are low, that is, it is difficult to ensure both a large viewing angle and high performance of the current electronic viewfinder with a small size.
Disclosure of Invention
In view of the above, an object of the present invention is to provide an eyepiece optical system, an electronic viewfinder, and an image pickup apparatus, which can ensure that the electronic viewfinder has a large viewing angle and high optical performance, and at the same time has a small size.
In order to achieve the purpose, the invention adopts the technical scheme that:
an eyepiece optical system through which light is imaged, a direction toward an eye of an observer being an eye side, and a direction opposite to the eye side being a display side, the eyepiece optical system being provided with a first lens group having negative refractive power and a second lens group having positive refractive power in order from the eye side to the display side; the first lens group is fixed, and the second lens group is movable in an optical axis direction.
The first lens group and the second lens group satisfy the following conditions:
-48.4＜f1/f2＜-1.4；
-48.4＜f1/f＜-1.0；
where f1 is the focal length of the first lens group, f2 is the focal length of the second lens group, and f is the focal length of the eyepiece optical system.
The first lens group is composed of a first lens having a negative refractive power; the second lens group comprises a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from the object side to the display side.
The second lens has a positive refractive power, the third lens has a positive refractive power or a negative refractive power, the fourth lens has a positive refractive power or a negative refractive power, and the fifth lens has a positive refractive power.
The second lens group satisfies the following conditions:
0.83＜f21/f2＜3.0；
-0.5＜f22/f2＜2.71；
-1.1＜f23/f2＜0.90；
0.55＜f24/f2＜2.6；
where f21 is a focal length of the second lens, f22 is a focal length of the third lens, f23 is a focal length of the fourth lens, f24 is a focal length of the fifth lens, and f2 is a focal length of the second lens group.
The first lens, the second lens, the third lens, the fourth lens and the fifth lens are made of materials meeting the following conditions:
1.48＜N11＜1.54；
1.53＜N21＜1.73；
1.53＜N22＜1.73；
1.53＜N23＜1.69；
1.53＜N24＜1.59；
wherein, N11 is a refractive index of the first lens, N21 is a refractive index of the second lens, N22 is a refractive index of the third lens, N23 is a refractive index of the fourth lens, and N24 is a refractive index of the fifth lens.
The first lens, the second lens, the third lens, the fourth lens and the fifth lens are made of materials meeting the following conditions:
V11≥64，V21≥54，V22≥21，V23≥21，V24≥55；
wherein V11 is the abbe number of the first lens, V21 is the abbe number of the second lens, V22 is the abbe number of the third lens, V23 is the abbe number of the fourth lens, and V24 is the abbe number of the fifth lens.
The first lens, the second lens, the third lens, the fourth lens and the fifth lens meet the following conditions:
0.02＜T1/T2＜0.05；
0.20＜T21/T2＜0.40；
0.04＜T22/T2＜0.45；
0.04＜T23/T2＜0.38；
0.17＜T24/T2＜0.42；
wherein T1 is a thickness of the first lens group on the optical axis, T2 is a thickness of the second lens group on the optical axis, T21 is a thickness of the second lens group on the optical axis, T22 is a thickness of the third lens group on the optical axis, T23 is a thickness of the fourth lens group on the optical axis, and T24 is a thickness of the fifth lens group on the optical axis.
The second lens group has a lens of an aspherical structure.
The utility model provides an electronic viewfinder, includes the finder frame body and sets up the display in the finder frame body, the finder frame body still is equipped with foretell eyepiece optical system, eyepiece optical system's first battery of lens is fixed in the finder frame body, the movably setting of second battery of lens is in the finder frame body.
The second lens group is arranged in a movable shell, a sliding rail is arranged on the movable shell, correspondingly, a sliding groove matched with the sliding rail is arranged in the viewfinder frame body, and an adjusting knob capable of enabling the second lens group to move back and forth is arranged on the outer side of the movable shell.
An image shooting device comprises a body and a shooting lens group arranged on the body, wherein the body is also provided with an image sensor for converting an optical signal of the shooting lens group into a digital signal and outputting the digital signal, and the electronic viewfinder for monitoring the digital signal of the image sensor.
After the scheme is adopted, the first lens group and the second lens group in the eyepiece optical system are arranged, so that the first lens group has negative refractive power, and the second lens group has positive refractive power, so that the eyepiece optical system has strong positive refractive power and good optical performance, the electronic viewfinder with the eyepiece optical system has a large view angle, the optical performance of the electronic viewfinder is improved, and the imaging quality of the electronic viewfinder is ensured. Meanwhile, the first lens group is set to be a fixed structure, and the second lens group is set to be movable along the optical axis direction, so that the structure is beneficial to adopting more optical mirror surfaces in a limited space, and the eyepiece optical system does not need to increase the space while improving the optical performance in the electronic viewfinder. Therefore, the electronic viewfinder provided with the eyepiece optical system of the invention has the characteristics of large view angle, high optical performance and small volume.
In addition, the invention further improves the curvature of field, distortion and eccentricity sensitivity of the ocular optical system by limiting the focal distance, the refractive index, the Abbe number and the thickness of the first lens group and the second lens group, further improves the optical performance of the ocular optical system, and ensures that an electronic viewfinder using the ocular optical system has better imaging quality on the basis of the visual field angle so as to carry a display with higher pixels.
Drawings
FIG. 1 is a schematic block diagram of an image capturing apparatus according to the present invention;
FIG. 2 is a schematic view of an electronic viewfinder according to the present invention;
FIG. 3 is a schematic diagram of a second lens group of the eyepiece optical system of the present invention;
FIG. 4a is a schematic structural diagram of an eyepiece optical system according to an embodiment of the present invention;
FIG. 4b is a schematic diagram of the eyepiece optics system adjusting with the viewer's power according to one embodiment of the present invention;
FIG. 5a is a spherical aberration diagram of an eyepiece optical system according to an embodiment of the present invention;
FIG. 5b is a field curvature diagram of an eyepiece optical system according to an embodiment of the present invention;
FIG. 5c is a distortion diagram of an eyepiece optical system according to an embodiment of the present invention;
FIG. 6 is a graph of the MTF (modulation transfer function) of an eyepiece optical system according to an embodiment of the present invention;
FIG. 7a is a schematic structural diagram of a second eyepiece optical system according to an embodiment of the present invention;
FIG. 7b is a schematic diagram of a second eyepiece optical system according to an embodiment of the present invention configured to adjust the power of the viewer;
FIG. 8a is a spherical aberration diagram of a second eyepiece optical system according to an embodiment of the present invention;
FIG. 8b is a field curvature diagram of a second eyepiece optical system of an embodiment of the present invention;
FIG. 8c is a distortion diagram of a second eyepiece optical system of an embodiment of the present invention;
fig. 9 is a MTF (modulation transfer function) graph of an eyepiece optical system according to a second embodiment of the present invention.
Fig. 10a is a schematic structural diagram of an eyepiece optical system according to a third embodiment of the present invention;
FIG. 10b is a schematic diagram of the eyepiece optics system according to the third embodiment of the present invention, which adjusts the power of the observer;
FIG. 11a is a spherical aberration diagram of a three-eyepiece optical system in accordance with an embodiment of the present invention;
FIG. 11b is a field curvature diagram of a three-eyepiece optical system in accordance with an embodiment of the present invention;
FIG. 11c is a distortion diagram of a three eyepiece optical system of an embodiment of the present invention;
fig. 12 is a MTF (modulation transfer function) graph of an eyepiece optical system according to a third embodiment of the present invention.
FIG. 13a is a schematic structural diagram of a four-eyepiece optical system in accordance with an embodiment of the present invention;
FIG. 13b is a schematic diagram of a quad-ocular optical system with adjustment of the viewer's power according to an embodiment of the present invention;
FIG. 14a is a spherical aberration diagram of a four-eyepiece optical system in accordance with an embodiment of the present invention;
FIG. 14b is a field curvature diagram of a four-eyepiece optical system in accordance with an embodiment of the present invention;
FIG. 14c is a distortion diagram of a four eyepiece optical system of an embodiment of the present invention;
fig. 15 is a MTF (modulation transfer function) graph of an eyepiece optical system according to a fourth embodiment of the present invention.
Detailed Description
An eyepiece optical system, an electronic viewfinder provided with the eyepiece optical system, and an image pickup apparatus equipped with the electronic viewfinder according to the present invention will be described in detail below with reference to the drawings attached to the specification.
First, referring to fig. 1, the image pickup apparatus includes a main body 1 and a camera lens group 2, wherein the camera lens group 2 is disposed on the main body 1, and the main body is further provided with an image sensor 3, an image processing chip 4, a display screen 5, an electronic viewfinder 6, and the like.
After the light passes through the camera lens group 2, the optical signal is converted into a digital signal by the image sensor 3, and the digital signal is transmitted to the display screen 5 and the electronic viewfinder 6 by the image processing chip 4 to be displayed.
The electronic viewfinder 6 is used for monitoring an image signal captured by the image sensor 3, and as shown in fig. 2 and 3, the electronic viewfinder 6 includes a viewfinder frame 61, a display 62, and an eyepiece optical system 7, the display 62 and the eyepiece optical system 7 are both disposed in the viewfinder frame 61, the eyepiece optical system 7 includes a first lens group 71 and a second lens group 72, the first lens group 71 is fixed in the viewfinder frame 71, and the second lens group 72 is movable back and forth in the viewfinder frame 61 according to the magnitude of the refractive power of an observer. In use, an observer observes an image on the display 62 from the first lens group 71 via the second lens group 72.
The movement of the second lens group 72 in the finder frame 61 can be realized by: the second lens group 72 is disposed in a movable housing 725, a slide rail is disposed on the movable housing 725, a slide groove matched with the slide rail is correspondingly disposed in the viewfinder frame 61, and an adjusting knob 726 capable of moving the second lens group 72 back and forth is disposed outside the movable housing 725. The observer can control the adjustment knob 726 according to his refractive power, and the distance of the second lens group 72 relative to the first lens group 71 and the display 62 is moved by the adjustment knob 726.
As shown in fig. 2 and 3, the eyepiece optical system 7 images an image of a display screen (the display 62 of the electronic viewfinder) by entering the eye of the observer through the eyepiece optical system 7, and the direction toward the eye of the observer is the eye side and the direction toward the display screen is the display side. The eyepiece optical system 7 is provided with a first lens group 71 and a second lens group 72 in this order from the eye side to the display side, the first lens group 71 having negative refractive power, the second lens group 72 having positive refractive power, the absolute value of the refractive power of the second lens group 72 being larger than that of the first lens group 71; the first lens group is fixed, and the second lens group is movable in the optical axis direction. When the image light of the display image is emitted, the image light passes through the second lens assembly 72 and the first lens assembly 71 in sequence, enters the eyes of the observer, and forms an image in the retina of the eyes of the observer.
The first lens group 71 has negative refractive power, the second lens group 72 has positive refractive power, and the absolute value of the refractive power of the second lens group 72 is greater than the absolute value of the refractive power of the first lens group 71, so that the eyepiece optical system 7 has strong positive refractive power, thereby ensuring that an electronic viewfinder provided with the eyepiece optical system 7 has a large viewing angle and high optical performance; therefore, the electronic viewfinder with the eyepiece optical system has a large viewing angle, improves the optical performance of the electronic viewfinder and ensures the imaging quality of the electronic viewfinder. Meanwhile, the first lens group is arranged in a fixed structure, and the second lens group is arranged to be movable along the optical axis direction, namely when the eyepiece optical system is used, the eyepiece optical system only needs to adjust the second lens group, and the first lens group is kept fixed. Compared with the whole adjustment of the whole eyepiece optical system, the invention fixes the first lens group and adjusts the second lens group, and the structure is beneficial to adopting more optical mirror surfaces in a limited space, so that the eyepiece optical system does not need to increase the space while improving the optical performance in the electronic viewfinder, and the electronic viewfinder with the eyepiece optical system has the characteristics of large view angle, high optical performance and small volume.
In order to provide the eyepiece optical system with larger positive refractive power and better optical performance, and ensure the viewing angle and imaging quality of the electronic viewfinder, the first lens group 71 and the second lens group 72 need to satisfy the following conditions:
-48.4＜f1/f2＜-1.4；
-48.4＜f1/f＜-1.0；
where f1 is the focal length of the first lens group 71, f2 is the focal length of the second lens group 72, and f is the focal length of the eyepiece optical system 7. The eyepiece optical system which meets the conditions further enlarges the view angle of the electronic viewfinder, simultaneously well compensates the field curvature of the eyepiece optical system, and improves the resolution capability of the periphery of the picture of the electronic viewfinder; but also can effectively compensate the distortion of the optical system and improve the texture of the picture.
In the eyepiece optical system described above, the first lens group 71 is constituted by a first lens 711 having negative refractive power; the second lens group 72 includes a second lens 721, a third lens 722, a fourth lens 723 and a fifth lens 724 sequentially arranged from the object side to the display side, wherein the second lens 721 has positive refractive power, the third lens 722 has positive refractive power or negative refractive power, the fourth lens 723 has positive refractive power or negative refractive power, and the fifth lens 724 has positive refractive power. Wherein, four lenses in the second lens group 72 may have an aspheric structure, and the second lens group 72 satisfies the following condition:
0.83＜f21/f2＜3.0；
-0.5＜f22/f2＜2.71；
-1.1＜f23/f2＜0.90；
0.55＜f24/f2＜2.6；
where f21 is a focal length of the second lens 721, f22 is a focal length of the third lens 722, f23 is a focal length of the fourth lens 723, f24 is a focal length of the fifth lens 724, and f2 is a focal length of the second lens group 72.
In order to increase the optical performance of the eyepiece optical system while increasing the field angle of the electronic viewfinder, the refractive indices of the first lens group 71 and the second lens group 72 may be set as follows to further correct the curvature of field of the eyepiece optical system:
1.48＜N11＜1.54；
1.53＜N21＜1.73；
1.53＜N22＜1.73；
1.53＜N23＜1.69；
1.53＜N24＜1.59；
where N11 is a refractive index of the first lens 711, N21 is a refractive index of the second lens 721, N22 is a refractive index of the third lens 722, N23 is a refractive index of the fourth lens 723, and N24 is a refractive index of the fifth lens 724.
On the basis of the above, in order to reduce chromatic aberration of the eyepiece optical system and further improve the imaging quality thereof, abbe numbers of the first lens group 71 and the second lens group 72 may be defined as follows:
V11≥64；
V21≥54；
V22≥21；
V23≥21；
V24≥55；
where V11 is the abbe number of the first lens 711, V21 is the abbe number of the second lens 721, V22 is the abbe number of the third lens 722, V23 is the abbe number of the fourth lens 723, and V24 is the abbe number of the fifth lens 724.
In addition, in order to reduce the decentering sensitivity of the eyepiece optical system and improve the yield in assembling the eyepiece optical system and the electronic viewfinder, the thicknesses of the first lens group 71 and the second lens group 72 are defined as follows:
0.02＜T1/T2＜0.05；
0.20＜T21/T2＜0.40；
0.04＜T22/T2＜0.45；
0.04＜T23/T2＜0.38；
0.17＜T24/T2＜0.42；
where T1 is a thickness of the first lens group 71 on the optical axis, T2 is a thickness of the second lens group 72 on the optical axis, T21 is a thickness of the second lens 721 on the optical axis, T22 is a thickness of the third lens 722 on the optical axis, T23 is a thickness of the fourth lens 723 on the optical axis, and T24 is a thickness of the fifth lens 724 on the optical axis.
To further elaborate the technical content of the invention, the eyepiece optical system will be described in detail below by exemplifying four embodiments.
Example one
As shown in fig. 4a, the eyepiece optical system of the first embodiment includes a first lens group 71 and a second lens group 72, in which the first lens group 71 includes a first lens 711 having a negative refractive power, a surface of the first lens 711 facing the eye side is a first face 7111, and a surface facing the display side is a second face 7112. The second lens group 72 includes a second lens 721, a third lens 722, a fourth lens 723, and a fifth lens 724 arranged in this order from the object side to the display side, the second lens 721 having a positive refractive power, and its surface facing the object side is a first surface 7211 and its surface facing the display side is a second surface 7212. The third lens 722 has a positive refractive power, and its surface facing the eye side is a first surface 7221, and its surface facing the display side is a second surface 7222. The fourth lens 723 has a negative refractive power, and its surface facing the eye side is a first surface 7231 and its surface facing the display side is a second surface 7232. The fifth lens 724 has positive refractive power, and its surface facing the eye side is a first surface 7241 and its surface facing the display side is a second surface 7242.
In the eyepiece optical system of this embodiment, the focal length f11 of the first lens 711 is-145.47, the refractive index N11 is 1.517, the abbe number N11 is 64.2, and the thickness T11 is 0.7. The focal length f21 of the second lens 721 is 47.47, the refractive index N21 is 1.587, the Abbe number N21 is 59.5, the thickness T21 is 4.796, the focal length f22 of the third lens 722 is 23.55, the refractive index N22 is 1.593, the Abbe number V22 is 68.6, and the thickness T22 is 8.744. The fourth lens 723 has a focal length f23 of-14.08, a refractive index N23 of 1.657, an Abbe number V23 of 21.3, and a thickness T23 of 2.988. The fifth lens 724 has a focal length f24 of 14.36, a refractive index N24 of 1.534, an Abbe number V24 of 55.6, and a thickness T24 of 4.63. Other optical parameters of the eyepiece optical system are shown in table 1-1.
TABLE 1-1
As can be seen from the above, in the eyepiece optical system of this embodiment, the focal length of the first lens group 71 is the focal length of the first lens 711, i.e., f1 is-145.47; the focal length of the second lens group 72 is the combined focal length of the second lens 721 to the fifth lens 724, i.e., f2 is 17.60; the focal length f of the entire eyepiece optical system was 18.77. Then, f1/f2 is-8.27, f1/f is-7.75, and the eyepiece optical system having a focal length within this numerical range has a large positive refractive power, so that the electronic viewfinder provided with this eyepiece optical system has a large viewing angle. Meanwhile, the curvature of field and distortion of the ocular optical system are improved, so that the imaging quality of the ocular optical system and the electronic viewfinder is improved.
In the first embodiment, the thickness of the first lens group 71 is equal to the thickness of the first lens, i.e. T1 is 0.7, and the thickness T2 of the second lens group 72 is 21.16; T1/T2 is 0.033, T21/T2 is 0.227, T22/T2 is 0.413, T23/T2 is 0.141, and T24/T2 is 0.219.
Referring to table 1-1 in conjunction with fig. 4b, the distance from the first lens 711 to the second lens 721 and the distance between the fifth lens 724 and the display 62 of the electronic viewfinder are related to the eye-point distance of the observer, which indicates that the position of the lens optical system 7 in the electronic viewfinder 6 moves with the diopter of the observer, as shown in table 1-2.
| EyepointEP(mm) | Diopter (diapter) | Distance between the first lens and the second lens | Distance between the fifth lens and the display |
| 12.5 | +2 | 0.74 | 7.65 |
| 12.5 | -1 | 1.85 | 6.53 |
| 12.5 | -4 | 2.94 | 5.44 |
Tables 1 to 2
According to tables 1-2, the present embodiment sets the eyepiece optical system to an adjustable structure, and the observer can adjust the position of the eyepiece optical system in the electronic viewfinder according to his diopter condition. Specifically, the eyepiece optical system in this embodiment is configured such that the first lens group is fixed and the second lens group is adjustable in the optical axis direction. Through adjusting the second lens group, not only can adjust the interval between first lens and the second lens, the interval between fifth lens and the display, solve the adaptation problem of electron view finder and viewer's refracting power, this structure has still reduced eyepiece optical system's occupation space in electron view finder, reduces the volume of electron view finder.
In order to reduce spherical aberration and distortion and improve the on-axis image-resolving performance of the eyepiece optical system, two surfaces of the second lens 721, the fourth lens 723 and the fifth lens 724 in the eyepiece optical system are all aspheric structures, that is, the first surface 7211 and the second surface 7212 of the second lens 721, the first surface 7231 and the second surface 7232 of the fourth lens 723 and the first surface 7241 and the second surface 7242 of the fifth lens 724 are all aspheric structures, and the aspheric surfaces are defined by the following formulas:
where F (R, R) represents the aspheric depth, i.e., the distance from the point of the aspheric surface at R from the optical axis I to the tangent plane to the aspheric vertex;
r is the vertical distance between a point on the aspheric curve and the optical axis I;
r is the curvature radius of the lens surface at the position close to the optical axis I;
k is cone constant;
a4, a6, A8, a10, a12, a14, and a16 are aspheric coefficients.
The conic coefficients K and aspheric coefficients of the second lens 721, the fourth lens 723, and the fifth lens 724 are specifically shown in tables 1-3.
Tables 1 to 3
Fig. 5 to 6 are aberration diagrams and MTF performance diagrams of the eyepiece optical system according to the first embodiment, which show aberration expressions that determine aberrations and resolution performance of imaging light from the display frame onto the retina of the observer's eye. When each aberration is small, each aberration of imaging of the retina of the eye of the observer is also small in expression, so that the observer can observe an image with better imaging quality.
Specifically, fig. 5a is a spherical aberration diagram of an eyepiece optical system according to an embodiment, and in fig. 5a, the abscissa thereof is the amount of spherical aberration in mm and the ordinate is the pupil. The distribution of the spherical aberration shows that the spherical aberration of the eyepiece optical system is controlled within +/-0.06 mm, so that the image plane center resolution quality of the eyepiece optical system is good.
Fig. 5b is a field curvature diagram of the eyepiece optical system according to the first embodiment, where in fig. 5b, the abscissa represents the shift amount of the image plane in mm, and the ordinate represents the image plane height. As can be seen from the distribution of the curvature of field, the curvature of field of the eyepiece optical system is controlled within +/-0.19 mm, so that the peripheral image plane resolution quality of the eyepiece optical system is good.
Fig. 5c is a distortion diagram of an eyepiece optical system according to an embodiment, where in fig. 5c, the abscissa is the amount of distortion, the unit is, and the ordinate is the image plane height. The distortion distribution shows that the distortion of the eyepiece optical system is controlled within +/-1.5%, so that the image surface global imaging quality of the eyepiece optical system is good.
Fig. 6 is a MTF (modulation transfer function diagram) of the eyepiece optical system according to the first embodiment, as shown in fig. 6, where the abscissa is spatial frequency, the unit is cycles/mm, the ordinate is modulation, i.e., MTF, and in the diagram, F1 to F4 are sequentially 0.0FA, 0.5FA, 0.7FA, and 1.0FA relative to the image plane, and T and R are the sagittal direction and the meridional direction, respectively. The MTFs can respectively see that the MTFs of the eyepiece optical system can ensure that the MTFs meet more than 20% when the spatial frequency is 80cycles/mm, so that the eyepiece optical system has good image plane global resolution quality.
Example two
As shown in fig. 7a, the eyepiece optical system in the second embodiment is similar to the first embodiment, and also includes a first lens 711, a second lens 721, a third lens 722, a fourth lens 723, and a fifth lens 724, except that the fourth lens 723 is made of a material with a higher abbe number ratio, and optical parameters of each lens are slightly different from those of the first embodiment.
Specifically, in the eyepiece optical system of the second embodiment, the focal length f11 of the first lens 711 is-105.71, the refractive index N11 is 1.517, the abbe number N11 is 64.2, and the thickness T11 is 0.7. The focal length f21 of the second lens 721 is 34.22, the refractive index N21 is 1.583, the Abbe number N21 is 59.5, the thickness T21 is 5.620, the focal length f22 of the third lens 722 is 17.1716, the refractive index N22 is 1.729, the Abbe number V22 is 54.7, and the thickness T22 is 8.9947. The fourth lens 723 has a focal length f23 of-6.7788, a refractive index N23 of 1.688, an Abbe number V23 of 31.1 and a thickness T23 of 1.4. The fifth lens 724 has a focal length f24 of 9.7019, a refractive index N24 of 1.534, an Abbe number V24 of 55.6, and a thickness T24 of 8.2. Other optical parameters of the eyepiece optical system are shown in table 2-1.
TABLE 2-1
As can be seen from the above, in the eyepiece optical system of this embodiment, the focal length of the first lens group 71 is the focal length of the first lens 711, i.e., f1 is-105.71; the focal length of the second lens group 72 is the combined focal length of the second lens 721 to the fifth lens 724, i.e., f2 is 17.94; the focal length f of the entire eyepiece optical system was 19.14. Then, f1/f2 is-5.89, f1/f is-5.52, and the eyepiece optical system having a focal length within this numerical range has a large positive refractive power, so that the electronic viewfinder provided with this eyepiece optical system has a large viewing angle. Meanwhile, the curvature of field and distortion of the ocular optical system are improved, so that the imaging quality of the ocular optical system and the electronic viewfinder is improved.
Referring to table 2-1 in conjunction with fig. 7b, the distance from the first lens 711 to the second lens 721 and the distance between the fifth lens 724 and the display 62 of the electronic viewfinder 6 are related to the eye-point distance of the observer, which indicates that the position of the lens optical system 7 in the electronic viewfinder 6 moves with the diopter of the observer, as shown in table 2-2.
| Eye point EP (mm) | Diopter (diapter) | Distance between the first lens and the second lens | Distance between the fifth lens and the display |
| 12.5 | +2 | 0.74 | 7.56 |
| 12.5 | -1 | 1.92 | 6.37 |
| 12.5 | -4 | 3.08 | 5.22 |
Tables 2 to 2
According to table 2-2, the present embodiment sets the eyepiece optical system to an adjustable structure, and the observer can adjust the position of the eyepiece optical system in the electronic viewfinder according to his diopter condition. Like the first embodiment, the eyepiece optical system in this embodiment is configured such that the first lens group is fixed and the second lens group is adjustable in the optical axis direction. Through adjusting the second lens group, not only can adjust the interval between first lens and the second lens, the interval between fifth lens and the display, solve the adaptation problem of electron view finder and viewer's refracting power, this structure has still reduced eyepiece optical system's occupation space in electron view finder, reduces the volume of electron view finder.
In order to reduce spherical aberration and distortion and improve the on-axis image-resolving performance of the eyepiece optical system, two surfaces of the second lens 721, the fourth lens 723 and the fifth lens 724 in the eyepiece optical system are all aspheric structures, that is, the first surface 7211 and the second surface 7212 of the second lens 721, the first surface 7231 and the second surface 7232 of the fourth lens 723 and the first surface 7241 and the second surface 7242 of the fifth lens 724 are all aspheric structures. The conic coefficients K and aspheric coefficients of the second lens 721, the fourth lens 723, and the fifth lens 724 are specifically shown in tables 2-3.
Tables 2 to 3
Fig. 8 to 9 are aberration diagrams and MTF performance diagrams of the eyepiece optical system according to the second embodiment, which show aberration expressions that determine aberrations and resolution performance of imaging light from the display screen onto the retina of the observer's eye.
Specifically, fig. 8a is a spherical aberration diagram of the second eyepiece optical system of the embodiment, and in fig. 8a, the abscissa thereof is the amount of spherical aberration in mm and the ordinate is the pupil. The distribution of the spherical aberration shows that the spherical aberration of the eyepiece optical system is controlled within +/-0.06 mm, so that the image plane center resolution quality of the eyepiece optical system is good.
Fig. 8b is a field curvature diagram of the second eyepiece optical system of the embodiment, and in fig. 8b, the abscissa represents the shift amount of the image plane in mm, and the ordinate represents the image plane height. As can be seen from the distribution of the curvature of field, the curvature of field of the eyepiece optical system is controlled within +/-0.19 mm, so that the peripheral image plane resolution quality of the eyepiece optical system is good.
Fig. 8c is a distortion diagram of the second eyepiece optical system of the embodiment, and in fig. 8c, the abscissa thereof is the amount of distortion, in units, and the ordinate is the image plane height. The distortion distribution shows that the distortion of the eyepiece optical system is controlled within +/-1.5%, so that the image surface global imaging quality of the eyepiece optical system is good.
Fig. 9 is a modulation transfer function diagram (MTF) of the eyepiece optical system according to the second embodiment, as shown in fig. 9, in which the abscissa represents spatial frequency in cycles/mm, the ordinate represents modulation, i.e., MTF, and F1 to F4 in the diagram sequentially represent relative image plane heights of 0.0FA, 0.5FA, 0.7FA, and 1.0FA, and T and R represent sagittal and meridional directions, respectively. The MTFs can respectively see that the MTFs of the eyepiece optical system can ensure that the MTFs meet more than 20% when the spatial frequency is 80cycles/mm, so that the eyepiece optical system has good image plane global resolution quality.
EXAMPLE III
As shown in fig. 10a, the eyepiece optical system in the third embodiment is similar to the first embodiment, and also includes a first lens 711, a second lens 721, a third lens 722, a fourth lens 723, and a fifth lens 724, except that the third lens 722 has negative refractive power, the fourth lens 723 has positive refractive power, and optical parameters of the respective lenses are slightly different from those of the first embodiment.
Specifically, in the eyepiece optical system of the third embodiment, the focal length f11 of the first lens 711 is-294.944, the refractive index N11 is 1.4875, the abbe number N11 is 70.4, and the thickness T11 is 0.7. The second lens 721 has a focal length f21 of 16.5625, a refractive index N21 of 1.72916, an abbe number N21 of 54.7, and a thickness T21 of 8.2336. The third lens 722 has a focal length f22 of-9.0130, a refractive index N22 of 1.6883, an Abbe number V22 of 31.1 and a thickness T22 of 1.05. The fourth lens 723 has a focal length f23 of 15.3519, a refractive index N23 of 1.5831, an abbe number V23 of 59.5, and a thickness T23 of 7.4. The fifth lens 724 has a focal length f24 of 44.1173, a refractive index N24 of 1.5831, an abbe number V24 of 59.5, and a thickness T24 of 6.7692. Other optical parameters of the eyepiece optical system are shown in table 3-1.
TABLE 3-1
As can be seen from the above, in the eyepiece optical system of this embodiment, the focal length of the first lens group 71 is the focal length of the first lens 711, i.e., f1 is-294.944; the focal length of the second lens group 72 is the combined focal length of the second lens 721 to the fifth lens 722, i.e., f2 is 18.4077; the focal length f of the entire eyepiece optical system is 18.801. Then, f1/f2 is-16.0229, f1/f is-15.6877, and the eyepiece optical system having a focal length within this numerical range has a large positive refractive power, so that the electronic viewfinder having this eyepiece optical system has a large viewing angle. Meanwhile, the curvature of field and distortion of the ocular optical system are improved, so that the imaging quality of the ocular optical system and the electronic viewfinder is improved.
Referring to table 3-2 in conjunction with fig. 10b, the distance from the first lens 711 to the second lens 721 and the distance between the fifth lens 724 and the display 62 of the electronic viewfinder are related to the eye-point distance of the observer, which indicates that the position of the lens optical system 7 in the electronic viewfinder 6 moves with the diopter of the observer, as shown in table 3-2.
| Eye point EP (mm) | Diopter (diapter) | Distance between the first lens and the second lens | Distance between the fifth lens and the display |
| 12.5 | +2 | 0.63 | 7.32 |
| 12.5 | -1 | 1.71 | 6.24 |
| 12.5 | -4 | 2.79 | 5.16 |
TABLE 3-2
According to table 3-2, the present embodiment sets the eyepiece optical system to an adjustable structure, and the observer can adjust the position of the eyepiece optical system in the electronic viewfinder according to his diopter condition. Like the first embodiment, the eyepiece optical system in this embodiment is configured such that the first lens group is fixed and the second lens group is adjustable in the optical axis direction. Through adjusting the second lens group, not only can adjust the interval between first lens and the second lens, the interval between fifth lens and the display, solve the adaptation problem of electron view finder and viewer's refracting power, this structure has still reduced eyepiece optical system's occupation space in electron view finder, reduces the volume of electron view finder.
In order to reduce spherical aberration and distortion and improve the on-axis image-resolving performance of the eyepiece optical system, two surfaces of the third lens 722, the fourth lens 723 and the fifth lens 724 in the eyepiece optical system are all aspheric structures, that is, the first surface 7221 and the second surface 7222 of the third lens 722, the first surface 7231 and the second surface 7232 of the fourth lens 723 and the first surface 7241 and the second surface 7242 of the fifth lens 724 are all aspheric structures. The conic coefficients K and aspheric coefficients of the third lens 722, the fourth lens 723, and the fifth lens 724 are specifically shown in tables 3-3.
Tables 3 to 3
Fig. 11 to 12 are aberration diagrams and MTF performance diagrams of the eyepiece optical system according to the third embodiment, which show aberration expressions that determine aberrations and resolution performance of imaging light from the display screen onto the retina of the observer's eye.
Specifically, fig. 11a is a spherical aberration diagram of the three-eyepiece optical system of the embodiment, and in fig. 11a, the abscissa thereof is the amount of spherical aberration in mm and the ordinate is the pupil. The distribution of the spherical aberration shows that the spherical aberration of the eyepiece optical system is controlled within +/-0.06 mm, so that the image plane center resolution quality of the eyepiece optical system is good.
Fig. 11b is a field curvature diagram of the three-eyepiece optical system of the embodiment, where the abscissa of fig. 11b is the shift amount of the image plane in mm and the ordinate is the image plane height. As can be seen from the distribution of the curvature of field, the curvature of field of the eyepiece optical system is controlled within +/-0.19 mm, so that the peripheral image plane resolution quality of the eyepiece optical system is good.
Fig. 11c is a distortion diagram of the three-eyepiece optical system of the embodiment, and in fig. 11c, the abscissa thereof is the amount of distortion, in units, and the ordinate is the image plane height. The distortion distribution shows that the distortion of the eyepiece optical system is controlled within +/-1.5%, so that the image surface global imaging quality of the eyepiece optical system is good.
Fig. 12 is a modulation transfer function diagram (MTF) of the eyepiece optical system according to the third embodiment, where the abscissa is spatial frequency in cycles/mm and the ordinate is modulation MTF, as shown in fig. 12, where F1 to F4 are sequentially 0.0FA, 0.5FA, 0.7FA, and 1.0FA relative to the image plane, and T and R are sagittal and meridional directions, respectively. The MTFs can respectively see that the MTFs of the eyepiece optical system can ensure that the MTFs meet more than 20% when the spatial frequency is 80cycles/mm, so that the eyepiece optical system has good image plane global resolution quality.
Example four
As shown in fig. 13a, the eyepiece optical system in the fourth embodiment is similar to the first embodiment, and includes a first lens 711, a second lens 721, a third lens 722, a fourth lens 723, and a fifth lens 724, except that the second lens 721 is a spherical lens, and optical parameters of the respective lenses are slightly different from those of the first embodiment.
Specifically, in the eyepiece optical system of the fourth embodiment, the focal length f11 of the first lens 711 is-134.21, the refractive index N11 is 1.517, the abbe number N11 is 64.2, and the thickness T11 is 0.7. The second lens 721 has a focal length f21 of 41.16, a refractive index N21 of 1.593, an abbe number N21 of 68.6, and a thickness T21 of 5.14. The third lens 722 has a focal length f22 of 22.55, a refractive index N22 of 1.729, an Abbe number V22 of 54.7, and a thickness T22 of 7.50. The fourth lens 723 has a focal length f23 of-13.06, a refractive index N23 of 1.640, an Abbe number V23 of 23.5, and a thickness T23 of 2.68. The fifth lens 724 has a focal length f24 of 16.17, a refractive index N24 of 1.535, an Abbe number V24 of 55.7, and a thickness T24 of 6.13. Other optical parameters of the eyepiece optical system are shown in table 4-1.
TABLE 4-1
As can be seen from the above, in the eyepiece optical system of this embodiment, the focal length of the first lens group 71 is the focal length of the first lens 711, i.e., f1 is-134.21; the focal length of the second lens group 72 is the combined focal length of the second lens 721 to the fifth lens 724, i.e., f2 is 16.99; the focal length f of the entire eyepiece optical system is 18.90. Then, f1/f2 is-7.8994, f1/f is-7.1010, and the eyepiece optical system having a focal length within this numerical range has a large positive refractive power, so that the electronic viewfinder having this eyepiece optical system has a large viewing angle. Meanwhile, the curvature of field and distortion of the ocular optical system are improved, so that the imaging quality of the ocular optical system and the electronic viewfinder is improved.
Referring to table 4-2 in conjunction with fig. 13b, the distance from the first lens 711 to the second lens 721 and the distance between the fifth lens 724 and the display 62 of the electronic viewfinder are related to the eye-point distance of the observer, which indicates that the position of the lens optical system 7 in the electronic viewfinder 6 moves with the diopter of the observer, as shown in table 4-2.
TABLE 4-2
According to table 4-2, the present embodiment sets the eyepiece optical system to an adjustable structure, and the observer can adjust the position of the eyepiece optical system in the electronic viewfinder according to his diopter condition. Like the first embodiment, the eyepiece optical system in this embodiment is configured such that the first lens group is fixed and the second lens group is adjustable in the optical axis direction. Through adjusting the second lens group, not only can adjust the interval between first lens and the second lens, the interval between fifth lens and the display, solve the adaptation problem of electron view finder and viewer's refracting power, this structure has still reduced eyepiece optical system's occupation space in electron view finder, reduces the volume of electron view finder.
In order to reduce spherical aberration and distortion and improve the on-axis image-resolving performance of the eyepiece optical system, two surfaces of the fourth lens 723 and the fifth lens 724 in the eyepiece optical system are both aspheric structures, that is, the first surface 7231 and the second surface 7232 of the fourth lens 723 and the first surface 7241 and the second surface 7242 of the fifth lens 724 are both aspheric structures. The conic coefficients K and aspheric coefficients of the fourth lens 723 and the fifth lens 724 are specifically shown in table 4-3.
| K | A4 | A6 | A8 | A10 | ||
| No. 4 lens | 1 st plane | 0.00 | -8.3525E-05 | 6.9551E-07 | -4.1137E-10 | -5.6482E-12 |
| The 2 nd surface | -0.10289 | -4.3352E-04 | 5.4854E-07 | 5.2478E-08 | -1.4541E-09 | |
| No. 5 lens | 1 st plane | -0.94563 | -2.4029E-04 | 3.1399E-06 | -3.5648E-09 | -9.6854E-11 |
| The 2 nd surface | 0.00 | 1.4163E-04 | -9.1713E-06 | 2.8776E-07 | -3.0855E-09 |
Tables 4 to 3
Fig. 14 to 15 are aberration diagrams and MTF performance diagrams of the eyepiece optical system according to the fourth embodiment, which show aberration expressions determining aberrations and resolution performance of imaging light from the display screen onto the retina of the observer's eye.
Specifically, fig. 14a is a spherical aberration diagram of the four-eyepiece optical system of the embodiment, and in fig. 14a, the abscissa thereof is the amount of spherical aberration in mm and the ordinate is the pupil. The distribution of the spherical aberration shows that the spherical aberration of the eyepiece optical system is controlled within +/-0.06 mm, so that the image plane center resolution quality of the eyepiece optical system is good.
Fig. 14b is a field curvature diagram of the four-eyepiece optical system of the embodiment, and in fig. 14b, the abscissa represents the shift amount of the image plane in mm, and the ordinate represents the image plane height. As can be seen from the distribution of the curvature of field, the curvature of field of the eyepiece optical system is controlled within +/-0.19 mm, so that the peripheral image plane resolution quality of the eyepiece optical system is good.
Fig. 14c is a distortion diagram of the four-eyepiece optical system of the embodiment, and in fig. 14c, the abscissa thereof is the amount of distortion, in units, and the ordinate is the image plane height. The distortion distribution shows that the distortion of the eyepiece optical system is controlled within +/-1.5%, so that the image surface global imaging quality of the eyepiece optical system is good.
Fig. 15 is a modulation transfer function diagram (MTF) of the eyepiece optical system according to the fourth embodiment, where the abscissa is spatial frequency in cycles/mm and the ordinate is modulation MTF, as shown in fig. 15, where F1 to F4 are sequentially 0.0FA, 0.5FA, 0.7FA, and 1.0FA relative to the image plane, and T and R are sagittal and meridional directions, respectively. The MTFs can respectively see that the MTFs of the eyepiece optical system can ensure that the MTFs meet more than 20% when the spatial frequency is 80cycles/mm, so that the eyepiece optical system has good image plane global resolution quality.
The above description is only exemplary of the present invention and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above exemplary embodiments according to the technical spirit of the present invention are within the technical scope of the present invention.
Claims (12)
1. An eyepiece optical system through which light is imaged, a direction toward an eye of an observer being an eye side, and a direction opposite to the eye side being a display side, characterized in that: the eyepiece optical system is provided with a first lens group with negative refractive power and a second lens group with positive refractive power in sequence from an eye side to a display side; the first lens group is fixed, and the second lens group is movable in an optical axis direction.
2. An eyepiece optical system as recited in claim 1, wherein: the first lens group and the second lens group satisfy the following conditions:
-48.4＜f1/f2＜-1.4；
-48.4＜f1/f＜-1.0；
where f1 is the focal length of the first lens group, f2 is the focal length of the second lens group, and f is the focal length of the eyepiece optical system.
3. An eyepiece optical system as recited in claim 1, wherein: the first lens group is composed of a first lens having a negative refractive power; the second lens group comprises a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from the object side to the display side.
4. An eyepiece optical system as recited in claim 3, wherein: the second lens has a positive refractive power, the third lens has a positive refractive power or a negative refractive power, the fourth lens has a positive refractive power or a negative refractive power, and the fifth lens has a positive refractive power.
5. An eyepiece optical system as recited in claim 3, wherein: the second lens group satisfies the following conditions:
0.83＜f21/f2＜3.0；
-0.5＜f22/f2＜2.71；
-1.1＜f23/f2＜0.90；
0.55＜f24/f2＜2.6；
where f21 is a focal length of the second lens, f22 is a focal length of the third lens, f23 is a focal length of the fourth lens, f24 is a focal length of the fifth lens, and f2 is a focal length of the second lens group.
6. An eyepiece optical system as recited in claim 3, wherein: the first lens, the second lens, the third lens, the fourth lens and the fifth lens are made of materials meeting the following conditions:
1.48＜N11＜1.54；
1.53＜N21＜1.73；
1.53＜N22＜1.73；
1.53＜N23＜1.69；
1.53＜N24＜1.59；
wherein, N11 is a refractive index of the first lens, N21 is a refractive index of the second lens, N22 is a refractive index of the third lens, N23 is a refractive index of the fourth lens, and N24 is a refractive index of the fifth lens.
7. An eyepiece optical system as recited in claim 3, wherein: the first lens, the second lens, the third lens, the fourth lens and the fifth lens are made of materials meeting the following conditions:
V11≥64，V21≥54，V22≥21，V23≥21，V24≥55；
wherein V11 is the abbe number of the first lens, V21 is the abbe number of the second lens, V22 is the abbe number of the third lens, V23 is the abbe number of the fourth lens, and V24 is the abbe number of the fifth lens.
8. An eyepiece optical system as recited in claim 3, wherein: the first lens, the second lens, the third lens, the fourth lens and the fifth lens meet the following conditions:
0.02＜T1/T2＜0.05；
0.20＜T21/T2＜0.40；
0.04＜T22/T2＜0.45；
0.04＜T23/T2＜0.38；
0.17＜T24/T2＜0.42；
wherein T1 is a thickness of the first lens group on the optical axis, T2 is a thickness of the second lens group on the optical axis, T21 is a thickness of the second lens group on the optical axis, T22 is a thickness of the third lens group on the optical axis, T23 is a thickness of the fourth lens group on the optical axis, and T24 is a thickness of the fifth lens group on the optical axis.
9. An eyepiece optical system as recited in claim 1, wherein: the second lens group has a lens of an aspherical structure.
10. An electronic viewfinder includes a viewfinder frame body and a display provided in the viewfinder frame body, characterized in that: the finder frame is further provided with an eyepiece optical system as recited in any one of claims 1 to 9, a first lens group of the eyepiece optical system being fixed in the finder frame, and the second lens group being movably disposed in the finder frame.
11. The electronic viewfinder of claim 10, wherein: the second lens group is arranged in a movable shell, a sliding rail is arranged on the movable shell, correspondingly, a sliding groove matched with the sliding rail is arranged in the viewfinder frame body, and an adjusting knob capable of enabling the second lens group to move back and forth is arranged on the outer side of the movable shell.
12. An image pickup apparatus includes a body and a lens group for taking a picture provided on the body, characterized in that: the main body is further provided with an image sensor for converting an optical signal of the photographing lens group into a digital signal and outputting the digital signal, and the electronic viewfinder according to claim 10 for monitoring the digital signal of the image sensor.
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| WO2022021150A1 (en) * | 2020-07-29 | 2022-02-03 | 深圳市大疆创新科技有限公司 | Electronic viewfinder and photographing device |
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| WO2022021150A1 (en) * | 2020-07-29 | 2022-02-03 | 深圳市大疆创新科技有限公司 | Electronic viewfinder and photographing device |
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