WO2021185201A1 - 变焦镜头, 摄像头模组及移动终端 - Google Patents
变焦镜头, 摄像头模组及移动终端 Download PDFInfo
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- WO2021185201A1 WO2021185201A1 PCT/CN2021/080741 CN2021080741W WO2021185201A1 WO 2021185201 A1 WO2021185201 A1 WO 2021185201A1 CN 2021080741 W CN2021080741 W CN 2021080741W WO 2021185201 A1 WO2021185201 A1 WO 2021185201A1
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- lens
- zoom lens
- lens group
- zoom
- object side
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
- G02B15/1431—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being positive
- G02B15/143105—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being positive arranged +-+
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/0065—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having a beam-folding prism or mirror
-
- 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
- G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/02—Bodies
- G03B17/17—Bodies with reflectors arranged in beam forming the photographic image, e.g. for reducing dimensions of camera
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/026—Details of the structure or mounting of specific components
- H04M1/0264—Details of the structure or mounting of specific components for a camera module assembly
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
- G03B2205/0046—Movement of one or more optical elements for zooming
Definitions
- the embodiments of the present application relate to the field of terminal technology, and in particular, to a zoom lens, a camera module, and a mobile terminal.
- the high-power optical zoom of mobile phone lenses released on the market is basically "jumping" zoom, that is, by carrying two to three lenses with different focal lengths, and matching algorithm-based digital zoom to achieve hybrid optical zoom; but jumping digital zoom It is based on multiple cameras with different focal lengths, relying on algorithm processing to achieve continuous zooming, not actual continuous zooming.
- the disadvantage is that during the zooming process, the imaging clarity of the disconnected part outside the focal range of the multiple cameras, Compared with the continuous optical zoom, it has decreased, which affects the image quality.
- the embodiments of the present application provide a zoom lens, a camera module, and a mobile terminal.
- the zoom lens can achieve continuous zooming to improve imaging quality.
- this application provides a zoom lens.
- the zoom lens includes: a first lens group, a second lens group, and a third lens group arranged from the object side to the image side.
- the first lens group is a fixed lens group with positive refractive power.
- the first lens group can converge light to compress the beam diameters of the second lens group and the third lens group.
- the position of the first lens group in the zoom lens is fixed.
- the second lens group is a zoom lens group with negative refractive power.
- the third lens group is a compensation lens group with positive refractive power.
- the second lens group and the third lens group are mutually focusing lens groups. Both the second lens group and the third lens group can move along the optical axis of the zoom lens (hereinafter referred to as the optical axis).
- the second lens group is a zoom lens group, which is used to change the focal length of the optical system.
- the third lens group is a compensation lens group for compensating the position of the image plane so that the focal point of the zoom lens falls on the imaging plane of the image sensor.
- the third lens group can compensate the focusing range of the second lens group.
- the third lens group can also be used to compress the beam angle during zooming so that the chief ray angle of the zoom lens matches the chief ray angle of the image sensor, and the third lens group can also be used for field curvature correction to correct aberrations.
- the second lens group moves along the optical axis to the image side
- the third lens group moves along the optical axis to the object side.
- the zoom lens is provided with a movable second lens group and a third lens group, and the zoom lens can perform continuous zooming by moving the second lens group and the third lens group, thereby obtaining better imaging quality. Since the moving directions of the second lens group and the third lens group during zooming are opposite, the stroke of the motor for driving the second lens group and the stroke of the motor for driving the third lens group can be shortened, In order to reduce the design difficulty of the motor, improve the control accuracy of the motor, and further improve the imaging quality of the zoom lens.
- the zoom lens can achieve continuous zooming through three lens groups, and the number of lens groups of the zoom lens is small, the zoom lens is easier to assemble.
- the last lens group of the zoom lens is the third lens group.
- the zoom lens can directly align and assemble the third lens group.
- the third lens group is the core lens group of the zoom lens. The assembly accuracy can be effectively guaranteed, the overall assembly accuracy of the zoom lens is higher, and the product yield rate is higher.
- the zoom lens further includes a lens holder, and a first lens barrel, a first motor, and a second motor fixed inside the lens holder.
- the first lens group is fixed inside the first lens barrel.
- the second lens group is mounted on the first motor, and the first motor is used to drive the second lens group to move along the optical axis.
- the third lens group is mounted on the second motor, and the second motor is used to drive the third lens group to move along the optical axis.
- the total number N of lenses in the first lens group, the second lens group, and the third lens group satisfies: 6 ⁇ N ⁇ 11.
- the total number of lenses of the zoom lens is greater than or equal to 6, so that the basic optical requirements of the three lens groups can be met to ensure the imaging quality of the zoom lens.
- the total number of lenses of the zoom lens is less than or equal to 11, which can limit the total length of the zoom lens TTL, thereby facilitating the miniaturization of the zoom lens.
- the first lens group includes at least one lens with positive refractive power and at least one lens with negative refractive power, and the lens of the first lens group closest to the object side has positive refractive power.
- the second lens group includes at least one lens, and the lens of the second lens group closest to the object side has negative refractive power.
- the third lens group includes at least three lenses, and the lens closest to the object side of the third lens group has positive refractive power.
- the third lens group includes at least one lens with negative refractive power.
- the lens with negative refractive power can diffuse the light, so that the imaging of the zoom lens can meet the image height requirement, and it is also conducive to meeting the small-diameter size requirement of the third lens group.
- the zoom lens includes at least one lens made of glass material. That is, the first lens group, the second lens group, and the third lens group include at least one lens made of glass material.
- the temperature drift of the zoom lens from -25° to 60° can be controlled within 30 ⁇ m. Thereby improving the focusing experience.
- the ratio of the total length TTL of the zoom lens from the surface closest to the object side to the imaging surface to the focal length f1 of the first lens group satisfies: 0.7 ⁇ TTL/f1 ⁇ 3.2.
- the ratio of the total length TTL of the zoom lens from the surface closest to the object side to the imaging surface and the focal length f2 of the second lens group satisfies: -7 ⁇ TTL/f2 ⁇ -3.
- the ratio of the total length TTL of the zoom lens from the surface closest to the object side to the imaging surface to the focal length f3 of the third lens group satisfies: 1.7 ⁇ TTL/f3 ⁇ 4.5.
- the zoom lens controls the ratio of the total length TTL to the focal lengths of the three lens groups within a certain range, so that the zoom lens has better imaging quality during continuous zooming.
- the ratio of the movement stroke L1 of the second lens group along the optical axis to the total length TTL of the zoom lens from the surface closest to the object side to the imaging surface satisfies:
- the movement stroke L1 of the second lens group can be controlled within a small range.
- the stroke requirement of the motor (ie, the first motor) that drives the second lens group to move is low, thereby reducing the design difficulty of the motor, improving the control accuracy of the motor, and further improving the imaging quality of the zoom lens.
- the ratio of the movement stroke L2 of the third lens group along the optical axis to the total length TTL of the zoom lens from the surface closest to the object side to the imaging surface satisfies:
- the movement stroke L2 of the third lens group can be controlled within a small range.
- the stroke requirement of the motor (that is, the second motor) driving the third lens group to move is low, thereby reducing the design difficulty of the motor, improving the control accuracy of the motor, and further improving the imaging quality of the zoom lens.
- the ratio of the total length TTL of the zoom lens from the surface closest to the object side to the imaging surface and the focal length Fmax of the telephoto end satisfies:
- the zoom lens can achieve a longer focal length through a shorter total length TTL, so that while ensuring the realization of telephoto shooting, the size of the zoom lens can be effectively reduced, making the zoom lens easier to install and have a wider application range .
- the ratio of the focal length Fmax at the long focal end of the zoom lens to the focal length Fmin at the short focal end of the zoom lens satisfies: Fmax/Fmin ⁇ 5.0.
- the ratio of the focal length Fmax at the long focal end to the focal length Fmin at the short focal end is controlled to balance the design difficulty of the zoom lens and the requirements of zoom performance, so that the zoom lens takes into account both performance and cost, and has a better The competitiveness of products.
- each lens of the zoom lens has a cutout for reducing the height of the lens.
- the lens in the zoom lens is provided with a notch for reducing the height of the lens, the size in the height direction of the optical system can be effectively reduced, so that the zoom lens has a smaller height size, which is better suitable for miniaturized mobile terminals. Increase the scope of application of the zoom lens.
- the lens can be set with a larger light-passing aperture, thereby increasing the light-passing quantity of the optical system and making the zoom lens have better imaging quality.
- the ratio of the effective height h of each lens of the zoom lens to the maximum clear aperture d satisfies: h/d ⁇ 0.45.
- the zoom lens controls the ratio of the effective height h of the lens to the maximum clear aperture d to be greater than or equal to 0.45, so that the zoom lens can reduce the lens height to achieve miniaturization, and its optical image can have a better surface.
- the shape and resolution are better.
- the effective height h of each lens of the zoom lens satisfies: h ⁇ 6.5mm.
- the zoom lens limits the height H of all lenses of the zoom lens by limiting the effective height h of all lenses, so that the size of the zoom lens can better match the miniaturized mobile terminal.
- the maximum clear aperture d of each lens of the zoom lens satisfies: d ⁇ 10mm.
- the zoom lens limits the maximum diameter D of all lenses of the zoom lens by limiting the maximum clear aperture d of all lenses, so that the size of the zoom lens can better match the miniaturized mobile terminal.
- the maximum clear aperture d of each lens of the zoom lens satisfies: d ⁇ 6.5mm.
- the module size of the zoom lens is small, which can be well suited for miniaturized mobile terminals.
- the third lens group includes an aperture stop
- the third lens group includes a first lens and a second lens arranged from the object side to the image side.
- the aperture stop is located on the object side of the first lens of the third lens group, or between the first lens and the second lens of the third lens group.
- the aperture stop is arranged in the third lens group, so that the aperture stop can better constrain the light in the optical system and improve the imaging quality of the zoom lens.
- the aperture stop may also be located between the first lens and the second lens of the third lens group.
- the working F-number of the zoom lens satisfies: 2.0 ⁇ working F-number ⁇ 6.5.
- the working F number refers to the equivalent aperture F number of the lens of the zoom lens after the notch processing is performed.
- the imaging of the zoom lens can obtain better resolution and better imaging quality.
- the present application also provides a camera module, including an image sensor and the zoom lens described in any one of the foregoing, and light can pass through the zoom lens to illuminate the image sensor.
- the camera module adopts the aforementioned zoom lens, which can obtain better imaging quality.
- the camera module further includes a prism or a mirror, which is located on the object side of the zoom lens and is used to deflect light to the zoom lens.
- the camera module changes the direction of light propagation by setting a prism or a mirror, so that the optical axis direction of the zoom lens can be different from the direction in which external light enters the mobile terminal, so that the placement position, angle, and angle of the camera module can be changed.
- Space, etc. are more flexible, and the zoom lens can be used in the periscope camera module.
- the direction of the optical axis of the zoom lens can be parallel to the display screen.
- the present application also provides a mobile terminal, including an image processor and the camera module described in any one of the foregoing, the image processor is in communication connection with the camera module, and the image processor is used to obtain image data from the camera module, And process image data.
- the camera module of the mobile terminal has better imaging quality, and the user's shooting experience is better.
- FIG. 1 is a schematic structural diagram of a mobile terminal in some embodiments provided by an embodiment of the present application
- Fig. 2 is a partial structural diagram of the mobile terminal shown in Fig. 1 taken along line A-A;
- FIG. 3 is a schematic diagram of the structure of the zoom lens of the camera module shown in FIG. 2;
- FIG. 4 is a schematic diagram of a part of the structure of the zoom lens shown in FIG. 3 in some embodiments;
- FIG. 5 is a schematic structural diagram of the zooming process of the zoom lens shown in FIG. 4;
- FIG. 6 is a schematic structural diagram of one lens of the first lens group of the zoom lens shown in FIG. 4;
- FIG. 7 is a schematic diagram of the structure of the lens shown in FIG. 6 at another angle
- FIG. 8 is a schematic structural diagram of one lens of the second lens group of the zoom lens shown in FIG. 4;
- Fig. 9 is an axial spherical aberration curve of the zoom lens shown in Fig. 4 at the first magnification
- Fig. 10 is a distortion curve of the zoom lens shown in Fig. 4 at the first magnification
- Fig. 11 is an axial spherical aberration curve of the zoom lens shown in Fig. 4 at a second magnification
- Fig. 12 is a distortion curve of the zoom lens shown in Fig. 4 at the second magnification
- Fig. 13 is an axial spherical aberration curve of the zoom lens shown in Fig. 4 at a third magnification
- Fig. 14 is a distortion curve of the zoom lens shown in Fig. 4 at a third magnification
- Fig. 15 is an axial spherical aberration curve of the zoom lens shown in Fig. 4 at a fourth magnification
- Fig. 16 is a distortion curve of the zoom lens shown in Fig. 4 at a fourth magnification
- FIG. 17 is a schematic diagram of a part of the structure of the zoom lens shown in FIG. 3 in other embodiments.
- FIG. 18 is a schematic structural diagram of the zooming process of the zoom lens shown in FIG. 17;
- Fig. 19 is an axial spherical aberration curve of the zoom lens shown in Fig. 17 at the first magnification
- FIG. 20 is a distortion curve of the zoom lens shown in FIG. 17 at the first magnification
- Fig. 21 is an axial spherical aberration curve of the zoom lens shown in Fig. 17 at the second magnification;
- Fig. 22 is a distortion curve of the zoom lens shown in Fig. 17 at the second magnification
- Fig. 23 is an axial spherical aberration curve of the zoom lens shown in Fig. 17 at the third magnification
- Fig. 24 is a distortion curve of the zoom lens shown in Fig. 17 at the third magnification
- FIG. 25 is a schematic structural diagram of a mobile terminal provided by an embodiment of the present application in other embodiments.
- Fig. 26 is a partial structural diagram of the mobile terminal shown in Fig. 25 taken along line B-B;
- FIG. 27 is a schematic diagram of a part of the structure of the camera module shown in FIG. 26 in some embodiments.
- FIG. 28 is a schematic diagram of a part of the structure of the camera module shown in FIG. 26 in other embodiments.
- the optical power is equal to the difference between the image-side beam convergence and the object-side beam convergence, and it represents the ability of the optical system to deflect light.
- a lens or lens group with positive refractive power has a positive focal length and has the effect of condensing light
- a lens or lens group with negative refractive power has a negative focal length and has the effect of diverging light
- Focal length also known as focal length, is a measure of the concentration or divergence of light in an optical system. It refers to the lens or lens group when a scene at infinity is formed into a clear image at the focal plane through a lens or lens group.
- the vertical distance from the optical center to the focal plane From a practical point of view, it can be understood as the distance from the center of the lens to the plane. For a fixed focus lens, the position of its optical center is fixed; for a zoom lens, the change of the optical center of the lens brings about a change in the focal length of the lens.
- the side where the subject is located is the object side
- the side where the image of the subject is located is the image side
- the surface of the lens close to the object side can be called the object side
- the surface of the lens close to the image side It can be called the image side.
- Aperture also known as diaphragm, is a device used to control the amount of light passing through the lens and entering the photosensitive surface of the body. It is usually inside the lens.
- Aperture F-number (F-number, also known as F-number), is the relative value (the reciprocal of the relative aperture) derived from the focal length of the lens/the clear diameter of the lens. The smaller the F-number of the aperture, the more light will enter in the same unit time. The larger the aperture F number, the smaller the depth of field, and the background content of the photo will be blurred, similar to the effect of a telephoto lens.
- Working F-number (also called working F-number) is a relative value (the reciprocal of the relative aperture) derived from the focal length of the lens/the clear diameter of the lens under working conditions. It is more suitable for situations where light is blocked. Optical system. The smaller the working F-number, the more light will enter in the same unit time. The larger the working F number, the smaller the depth of field, and the background content of the photo will be blurred, similar to the effect of a telephoto lens.
- Total track length refers to the total length from the surface of the lens closest to the object side to the imaging surface. TTL is the main factor that forms the height of the camera.
- the imaging surface is located on the image side of all the lenses in the zoom lens, and the carrying surface where light passes through each lens in the zoom lens in turn to form an image.
- the optical axis is a line of light passing through the center of the lens perpendicularly.
- the optical axis of the lens is the line passing through the center of the lens.
- the Abbe coefficient is the difference ratio of the refractive index of an optical material at different wavelengths, and represents the degree of dispersion of the material.
- Spherical aberration also known as spherical aberration, is the difference between the actual image point and the ideal image point.
- On-axis spherical aberration is the difference between the actual image point and the ideal image point in the direction parallel to the optical axis.
- Distortion also known as distortion
- distortion is the degree of distortion of the image formed by the optical system on the object relative to the object itself. Distortion is due to the influence of the spherical aberration of the diaphragm.
- the height of the intersection point between the chief rays of different fields of view and the Gaussian image plane after passing through the optical system is not equal to the ideal image height, and the difference between the two is distortion. Therefore, the distortion only changes the imaging position of the off-axis object point on the ideal surface, causing distortion of the shape of the image, but does not affect the sharpness of the image.
- the embodiments of the present application provide a zoom lens, a camera module using the zoom lens, and a mobile terminal including the camera module.
- the zoom lens includes three lens groups arranged in sequence from the object side to the image side.
- the second lens group and the third lens group can move along the optical axis, so that the zoom lens realizes continuous zooming to obtain better imaging quality.
- the two lens groups located in the middle move in a direction close to each other to achieve zooming. Since the moving directions of the two lens groups are opposite, the stroke of the motor can be shortened, thereby reducing the design difficulty of the motor, improving the control accuracy of the motor, and further improving the imaging quality of the zoom lens.
- the mobile terminal may be a mobile phone, a tablet computer, a laptop computer, and other devices that have a photographing or video recording function.
- FIG. 1 is a schematic structural diagram of a mobile terminal 100 according to an embodiment of the present application in some embodiments
- FIG. 2 is a partial structural diagram of the mobile terminal 100 shown in FIG. 1 taken along line AA .
- the mobile terminal 100 is a mobile phone as an example for description.
- the mobile terminal 100 includes a housing 10, a display screen 20, an image processor 30 and a camera module 40.
- the housing 10 includes a frame 101 and a back cover 102.
- the frame 101 and the back cover 102 may be an integral structure, or may be assembled to form an integral structure.
- the display screen 20 and the back cover 102 are respectively installed on both sides of the frame 101, and jointly enclose an inner cavity 50 of the whole machine.
- the image processor 30 and the camera module 40 are housed in the internal cavity 50 of the complete machine.
- the image processor 30 is in communication connection with the camera module 40, and the image processor 30 is used to obtain image data from the camera module 40 and process the image data.
- the communication connection between the camera module 40 and the image processor 30 may include data transmission through electrical connections such as wiring, or data transmission through coupling or the like. It is understandable that the camera module 40 and the image processor 30 may also be connected to each other in a way that can realize data transmission.
- the function of the image processor 30 is to optimize the digital image signal through a series of complex mathematical algorithm operations, and finally transmit the processed signal to the display.
- the image processor 30 can be an image processing chip or a digital signal processing chip. Its function is to transfer the data obtained by the photosensitive chip to the central processing unit and refresh the photosensitive chip in a timely and fast manner. Therefore, the quality of the image processor 30 directly affects the quality of the chip. Picture quality (such as color saturation, sharpness, etc.).
- the back cover 102 is provided with a camera hole 103, the camera module 40 collects light through the camera hole 103, and the camera module 40 serves as a rear camera of the mobile terminal 100.
- the back cover 102 includes a light-transmitting lens 104, which is installed in the imaging hole 103 to allow light to pass through, and is dust-proof and waterproof.
- the camera module 40 may also be used as a front camera of the mobile terminal 100.
- the installation position of the camera module 40 of the mobile terminal 100 in the embodiment shown in FIG. 1 is only illustrative, and the installation position of the camera module 40 is not strictly limited in this application.
- the camera module 40 may also be installed in other positions of the mobile terminal 100.
- the camera module 40 may be installed in the upper middle or upper right corner of the back of the mobile terminal 100.
- the mobile terminal 100 may include a terminal body and an auxiliary component that can be rotated, moved or detached relative to the terminal body, and the camera module 40 may also be provided on the auxiliary component.
- the mobile terminal 100 may further include an analog-to-digital converter (also referred to as an A/D converter, not shown in the figure).
- the analog-to-digital converter is connected between the camera module 40 and the image processor 30.
- the analog-to-digital converter is used to convert the signal generated by the camera module 40 into a digital image signal and transmit it to the image processor 30, and then the digital image signal is processed by the image processor 30, and finally the image or image is displayed on the display screen 20.
- the mobile terminal 100 may further include a memory (not shown in the figure).
- the memory is in communication connection with the image processor 30, and the image processor 30 processes the image digital signal before transmitting the image to the memory for convenience. When the image needs to be viewed later, the image can be searched from the storage and displayed on the display screen 20 at any time.
- the image processor 30 also compresses the processed image digital signal and stores it in the memory to save memory space.
- the camera module 40 includes a circuit board 1, an image sensor 2, a holder 3, a zoom lens 4 and a filter 5.
- the base 3 is fixed to the circuit board 1, and the image sensor 2 is fixed to the circuit board 1 and located inside the base 3.
- the zoom lens 4 is mounted on the base 3 and is located on the side of the image sensor 2 facing away from the circuit board 1.
- the image sensor 2 is located on the image side of the zoom lens 4.
- the filter 5 is installed on the base 3 and is located between the zoom lens 4 and the image sensor 2. Light can pass through the zoom lens 4 and irradiate the imaging surface 21 of the image sensor 2.
- the working principle of the camera module 40 is: the light reflected by the subject is projected to the imaging surface 21 of the image sensor 2 through the zoom lens 4 to generate an optical image, and the image sensor 2 converts the optical image into an electrical signal, that is, an analog image signal It is transmitted to the analog-to-digital converter to be converted into a digital image signal to the image processor 30 through the analog-to-digital converter.
- the image sensor 2 (also referred to as a photosensitive element) is a semiconductor chip with hundreds of thousands to millions of photodiodes on the surface, which generates electric charges when irradiated by light.
- the image sensor 2 may be a charge coupled device (CCD) or a complementary metal-oxide conductor device (CMOS).
- CMOS complementary metal-oxide conductor device
- the charge coupling device is made of a high-sensitivity semiconductor material, which can convert light into electric charge.
- the charge-coupled device is composed of many photosensitive units, usually in megapixels. When the surface of the charge coupling device is illuminated by light, each photosensitive unit will reflect the charge on the component, and the signals generated by all the photosensitive units are added together to form a complete picture.
- Complementary metal oxide conductor devices are mainly semiconductors made of the two elements of silicon and germanium, so that there are N (charged-charged) and P (charged +) grades coexisting on complementary metal oxide conductor devices. In semiconductors, the current generated by these two complementary effects can be recorded and interpreted into an image by the processing chip.
- the zoom lens 4 affects the imaging quality and imaging effect. It mainly uses the principle of lens refraction for imaging, that is, the light from the scene passes through the zoom lens 4 to form a clear image on the focal plane, and the image sensor 2 located on the focal plane records the scene image.
- the filter 5 is used to eliminate unnecessary light projected on the image sensor 2 and prevent the image sensor 2 from generating false colors or ripples, so as to improve its effective resolution and color reproduction.
- the filter 5 may be an infrared filter 5.
- FIG. 3 is a schematic structural diagram of the zoom lens 4 of the camera module 40 shown in FIG. 2.
- FIG. 3 all the lenses in the lens group of the zoom lens 4 are simplified into one lens structure for illustration, and the structure in FIG. 3 does not form a limitation on the number and shape of the lenses in the lens group.
- the zoom lens 4 includes a first lens group G1, a second lens group G2, and a third lens group G3 arranged from the object side to the image side.
- the first lens group G1 is a fixed lens group with positive refractive power.
- the first lens group G1 can converge light to compress the beam diameters of the second lens group G2 and the third lens group G3.
- the position of the first lens group G1 in the zoom lens 4 is fixed.
- the second lens group G2 is a zoom lens group with negative refractive power
- the third lens group G3 is a compensation lens group with positive refractive power.
- the second lens group G2 and the third lens group G3 are mutually focusing lens groups.
- Both the second lens group G2 and the third lens group G3 can move along the optical axis 401 of the zoom lens 4 (hereinafter referred to as the optical axis 401).
- the second lens group G2 is a zoom lens group for changing the focal length of the optical system.
- the third lens group G3 is a compensation lens group for compensating the image plane position so that the focus of the zoom lens 4 falls on the imaging plane 21 of the image sensor 2. In other words, the third lens group G3 can compensate the focusing range of the second lens group G2.
- the third lens group G3 can also be used to compress the beam angle during zooming, so that the chief ray angle (CRA) of the zoom lens 4 matches the chief ray angle of the image sensor 2.
- the third lens group G3 can also be used for curvature of field correction to correct aberrations.
- the zoom lens 4 is provided with a movable second lens group G2 and a third lens group G3, and the zoom lens 4 can perform continuous zooming by moving the second lens group G2 and the third lens group G3 to obtain a better Good image quality. Since the zoom lens 4 can achieve continuous zooming through three lens groups, and the number of lens groups of the zoom lens 4 is small, the zoom lens 4 is easier to assemble.
- the last lens group of the zoom lens 4 is the third lens group G3, and the zoom lens 4 can directly perform active alignment (AA) assembly of the third lens group G3.
- the third lens group G3 is the third lens group G3. Therefore, the assembly accuracy of the core lens group of the zoom lens 4 can be effectively guaranteed, and the overall assembly accuracy of the zoom lens 4 is higher, and the product yield rate is higher.
- the zoom lens 4 further includes a lens holder 402, and a first lens barrel 403, a first motor 404, and a second motor 405 fixed inside the lens holder 402.
- the first lens group G1 is fixed inside the first lens barrel 403.
- the second lens group G2 is mounted on the first motor 404, and the first motor 404 is used to drive the second lens group G2 to move along the optical axis 401.
- the third lens group G3 is mounted on the second motor 405, and the second motor 405 is used to drive the third lens group G3 to move along the optical axis 401.
- the types of the first motor 404 and the second motor 405 may be the same or different.
- the structure for installing multiple lens groups in the zoom lens 4 may also have other design solutions, which are not strictly limited in this application.
- FIG. 4 is a partial structural diagram of the zoom lens 4 shown in FIG. 3 in some embodiments. Among them, FIG. 4 mainly illustrates the structure of multiple lens groups of the zoom lens 4, and for convenience of description, the filter 5 and the imaging surface 21 of the camera module 40 are also illustrated at the same time.
- the total number N of lenses in the first lens group G1, the second lens group G2, and the third lens group G3 satisfies: 6 ⁇ N ⁇ 11.
- the total number of lenses in the three lens groups of the zoom lens 4 is 8 elements.
- the total number N of lenses in the three lens groups of the zoom lens 4 may also be 6, 7, 9, 10, or 11. It is understandable that, in the embodiment of the present application, the lenses in the zoom lens 4 are all lenses with positive or negative refractive power. When a flat lens is inserted between multiple lenses, the flat lens is not counted as the zoom lens 4. Of the lens.
- the total number of lenses of the zoom lens 4 is greater than or equal to 6, so that the basic optical requirements of the three lens groups can be met to ensure the imaging quality of the zoom lens 4.
- the total number of lenses of the zoom lens 4 is less than or equal to 11, which can limit the total length TTL of the zoom lens 4, thereby facilitating the miniaturization of the zoom lens 4.
- the first lens group G1 includes at least one lens with positive refractive power and at least one lens with negative refractive power, and the lens closest to the object side of the first lens group G1 has positive refractive power.
- the first lens group G1 may include two lenses, and the refractive power of the two lenses may be one positive and one negative.
- the lens 41 closer to the object side has positive refractive power
- the lens 42 closer to the image side has negative refractive power.
- the first lens group G1 may include three lenses, and the refractive power of the three lenses may be two positive and one negative, or one positive and two negative. The lens closest to the object side among the three lenses has positive refractive power.
- the optical surface of the lens in the first lens group G1 may be a spherical surface or an aspherical surface.
- Each lens includes two optical surfaces, one facing the object side, which is the object side, and the other facing the image side, which is the image side.
- the second lens group G2 includes at least one lens, and the lens closest to the object side of the second lens group G2 has negative refractive power.
- the second lens group G2 may include two lenses, the lens 43 closer to the object side has negative refractive power, and the lens 44 closer to the image side may have positive refractive power or negative refractive power.
- the optical surfaces of the lenses in the second lens group G2 may be spherical or aspherical. In some other embodiments, the second lens group G2 may also include one, three or four lenses.
- the third lens group G3 includes at least three lenses, and the lens closest to the object side of the third lens group G3 has positive refractive power.
- the third lens group G3 may include at least one lens with negative refractive power. At this time, the lens with negative refractive power can diffuse the light, so that the imaging of the zoom lens 4 meets the requirement of image height, which is also conducive to meeting the requirement of small aperture size of the third lens group G3.
- the third lens group G3 may include four lenses. Among the four lenses, the lens 45 closest to the object side has positive refractive power, and the lens 48 closest to the image side has negative refractive power. The lens 46 located in the middle has positive refractive power, and the lens 47 has negative refractive power. In some other embodiments, the third lens group G3 may also include three lenses or five lenses.
- the ratio of the total length TTL of the zoom lens 4 from the surface closest to the object side to the imaging surface 21 to the focal length f1 of the first lens group G1 satisfies: 0.7 ⁇ TTL/f1 ⁇ 3.2.
- the value of TTL/f1 can be 0.7, 0.9, 1.5, 1.69, 2.26, 2.8, 3.0, 3.2 and so on.
- the ratio of the total length TTL of the zoom lens 4 from the surface closest to the object side to the imaging surface 21 to the focal length f2 of the second lens group G2 satisfies: -7 ⁇ TTL/f2 ⁇ -3.
- the value of TTL/f2 can be -7, -5, -4.6, -4.2, -3.5, -3, and so on.
- the ratio of the total length TTL of the zoom lens 4 from the surface closest to the object side to the imaging surface 21 to the focal length f3 of the third lens group G3 satisfies: 1.7 ⁇ TTL/f3 ⁇ 4.5.
- the value of TTL/f3 can be 1.7, 2.3, 3.2, 3.6, 3.89, 4.23, 4.5, etc.
- the zoom lens 4 controls the ratio of the total length TTL to the focal lengths of the three lens groups to be within a certain range, so as to have better imaging quality during continuous zooming.
- the zoom lens 4 includes at least one lens made of glass material. That is, the first lens group G1, the second lens group G2, and the third lens group G3 include at least one lens made of glass material. In this embodiment, since the first lens group G1, the second lens group G2, and the third lens group G3 are provided with at least one lens made of glass material, the temperature drift of the zoom lens 4 from -25° to 60° can be controlled Within 30 ⁇ m, thereby improving the focus experience.
- the optical surface of the lens using glass material may be a spherical surface or an asphere.
- the first lens and the second lens arranged from the object side to the image side of the first lens group G1 may be made of glass material.
- the lens of the third lens group G3 closest to the object side may be made of glass material.
- the other lenses in the zoom lens 4 can be made of plastic materials, and all of their optical surfaces can be aspherical.
- the aspherical design can improve the imaging quality of the zoom lens 4.
- the optical surface of the lens of the zoom lens 4 made of plastic material may also be partly spherical, partly aspherical, or all spherical.
- the third lens group G3 includes an aperture stop 49.
- the third lens group G3 includes a first lens 45 and a second lens 46 arranged from the object side to the image side.
- the aperture stop 49 is located on the object side of the first lens 45 of the third lens group G3.
- the aperture stop 49 is provided in the third lens group G3, so that the aperture stop 49 can better constrain the light in the optical system and improve the imaging quality of the zoom lens 4.
- the aperture stop 49 may also be located between the first lens 45 and the second lens 46 of the third lens group G3.
- the total length TTL of the zoom lens 4 satisfies: TTL ⁇ 45 mm, which is beneficial to the miniaturization of the zoom lens 4, so that the zoom lens 4 can be better applied to the miniaturized mobile terminal 100.
- FIG. 5 is a schematic structural diagram of the zooming process of the zoom lens 4 shown in FIG. 4.
- FIG. 5 mainly illustrates the structure of the lens group of the zoom lens 4, and for convenience of description, the filter 5 and the imaging surface 21 of the camera module 40 are also illustrated at the same time.
- Figure 5 shows the four focal length states of the zoom lens 4, including the first magnification (that is, the short focal end), the second magnification (that is, the first intermediate magnification), and the third magnification (that is, the second intermediate magnification). ) And the fourth magnification (that is, at the telephoto end), the focal length of the zoom lens 4 increases from the first magnification to the fourth magnification.
- the second lens group G2 moves toward the image side along the optical axis 401
- the third lens group G3 moves toward the image side along the optical axis 401. Move the object side. That is, during the zooming process of the zoom lens 4 from the short focal end to the long focal end, the second lens group G2 and the third lens group G3 move closer to each other, and their moving directions are opposite.
- the second lens group G2 moves to the object side along the optical axis 401
- the third lens group G3 moves to the image side along the optical axis 401. That is, during the zooming process of the zoom lens 4 from the short focal end to the long focal end, the second lens group G2 and the third lens group G3 move away from each other, and their moving directions are opposite.
- the motor that is, the first motor 404 for driving the second lens group G2
- the stroke of the motor ie, the second motor 405 used to drive the third lens group G3 to move, so as to reduce the design difficulty of the motor, improve the control accuracy of the motor, and further improve the imaging quality of the zoom lens 4.
- the ratio of the movement stroke L1 of the second lens group G2 along the optical axis 401 to the total length TTL of the zoom lens 4 from the surface closest to the object side to the imaging surface 21 satisfies:
- the ratio of the movement stroke L1 of the second lens group G2 along the optical axis 401 to the total length TTL of the zoom lens 4 may satisfy: 0.05 ⁇
- can be 0.075, 0.08, 0.095, 0.12, 0.16, 0.25, 0.3, etc.
- the movement stroke L1 of the second lens group G2 can be controlled to a small Within the range, the stroke requirement of the motor driving the second lens group G2 (ie, the first motor 404) is low, thereby reducing the difficulty of motor design, improving the control accuracy of the motor, and further improving the imaging quality of the zoom lens 4.
- the ratio of the movement stroke L2 of the third lens group G3 along the optical axis 401 to the total length TTL of the zoom lens 4 from the surface closest to the object side to the imaging surface 21 satisfies:
- the ratio of the movement stroke L2 of the third lens group G3 along the optical axis 401 to the total length TTL of the zoom lens 4 may satisfy: 0.07 ⁇
- can be 0.084, 0.09, 0.13, 0.156, 0.23, 0.26, 0.3, etc.
- the movement stroke L2 of the third lens group G3 can be controlled to a small Within the range, the stroke requirement of the motor driving the third lens group G3 (ie, the second motor 405) is low, thereby reducing the design difficulty of the motor, improving the control accuracy of the motor, and further improving the imaging quality of the zoom lens 4.
- the ratio of the total length TTL of the zoom lens 4 from the surface closest to the object side to the imaging surface 21 to the focal length Fmax of the telephoto end satisfies:
- can be 0.82, 0.934, 0.96, 1.21, 1.3, 1.42, 1.5, 1.7, 2.0, etc.
- the zoom lens 4 can achieve a longer focal length through a shorter total length TTL, so that while ensuring the realization of telephoto shooting, the size of the zoom lens 4 is effectively reduced, making the zoom lens 4 easier to install and apply The scope is wider.
- the ratio of the focal length Fmax at the long focal end of the zoom lens 4 to the focal length Fmin at the short focal end of the zoom lens 4 satisfies: Fmax/Fmin ⁇ 5.0.
- the value of Fmax/Fmin can be 2.5, 3.3, 3.7, 4.2, 5, and so on.
- the design difficulty of the zoom lens 4 and the requirements of zoom performance are well balanced, so that the zoom lens 4 takes into account both performance and cost. Better product competitiveness.
- FIG. 6 is a schematic structural diagram of a lens 41 of the first lens group G1 of the zoom lens 4 shown in FIG. 4, and FIG. 7 is a schematic structural diagram of the lens shown in FIG. 6 at another angle.
- the lens 41 includes an effective optical zone 41a and an ineffective optical zone 41b arranged around the effective optical zone 41a.
- the effective optical zone 41a is an area for deflecting light.
- the effective optical zone 41a is also the area where the optical effective path is located.
- the ineffective optical zone 41b is an area that is not used for deflecting light, but can be used for lens support or support.
- the ineffective optical zone 41b is also the area where the optical ineffective path is located.
- the effective optical zone and the ineffective optical zone of other lenses in the zoom lens 4 are defined in the same way.
- each lens of the first lens group G1 has a cutout for reducing the height of the lens.
- the cutout of each lens included in the first lens group G1 is partially located in the effective optical zone and partially located in the non-effective optical zone.
- the lens 41 of the first lens group G1 has a cutout 411.
- the number of the cutouts 411 is two, and the two cutouts 411 are respectively provided on both sides of the lens 41, and the cutout planes are parallel to each other.
- the height H of the lens 41 is the size of the entire lens 41 in the vertical direction of the cut plane.
- the effective height h of the lens 41 is the size of the effective optical zone 41a of the lens 41 in the vertical direction of the cut plane.
- the effective height h of the lens 41 shown in FIG. 7 is the same as the height H.
- the maximum clear aperture d of the lens 41 is the maximum diameter of the effective optical zone 41 a of the lens 41.
- the maximum diameter D of the lens 41 is the diameter of the entire lens.
- the effective height h, height H, maximum clear aperture d, and maximum diameter D of other lenses in the zoom lens 4 are defined in the same way. In some other embodiments, the number of notches 411 may also be one.
- the cutout part is located in the effective optical zone and part is located in the ineffective optical zone, although it will reduce the image resolution and resolution of the zoom lens 4 to a certain extent.
- the illuminance can greatly reduce the height of the lenses of the first lens group G1, thereby greatly reducing the height of the zoom lens 4, which is beneficial to the miniaturization of the zoom lens 4.
- FIG. 8 is a schematic diagram of the structure of one lens 43 of the second lens group G2 of the zoom lens 4 shown in FIG. 4.
- each lens of the second lens group G2 has a cutout for reducing the height of the lens.
- the cutout of each lens included in the second lens group G2 is located in the ineffective optical zone.
- the lens 43 of the second lens group G2 has a cutout 431.
- the number of the cutouts 431 is two, and the two cutouts 431 are respectively provided on both sides of the lens 43, and the cutout planes are parallel to each other.
- the cutout 431 is located in the ineffective optical zone 43b of the lens 43. In some other embodiments, the number of notches 431 may also be one.
- the cut of the second lens group G2 is not the effective optical zone, so the cut on the lens can reduce the height of the lens of the second lens group G2. , It will not affect the imaging quality of the zoom lens 4.
- the effective height h of the lens 43 of the second lens group G2 is equal to the maximum clear aperture d.
- the direction of the effective height h of the lens 43 of the second lens group G2 is consistent with the direction of the effective height h of the lens 41 of the first lens group G1.
- the effective height h of the lens 43 is smaller than the height H of the lens 43.
- each lens of the third lens group G3 has a cutout for reducing the height of the lens.
- the cutout of each lens included in the third lens group G3 is located in the ineffective optical zone.
- the lens cutout can reduce the height of the lens of the second lens group G2 and also It will not affect the imaging quality of the zoom lens 4.
- each lens of the zoom lens 4 has a cutout for reducing the height of the lens.
- the incision can be realized by the I-CUT process. Since the lens in the zoom lens 4 is provided with a cutout for reducing the height of the lens, the size in the height direction of the optical system can be effectively reduced, so that the zoom lens 4 has a smaller height size, which is better suitable for miniaturized movement. In the terminal 100, the scope of application of the zoom lens 4 is increased. In addition, since the height of the lens is reduced by a notch method, the lens can be set with a larger light-passing aperture, thereby increasing the light-passing amount of the optical system, so that the imaging quality of the zoom lens 4 is better.
- the ratio of the effective height h of each lens of the zoom lens 4 to the maximum clear aperture d satisfies: h/d ⁇ 0.45.
- the value of h/d can be 0.45, 0.5, 0.52, 0.6, 0.68, 0.8, and so on.
- the effective height h and the maximum clear aperture d of the lens 41 and the lens 43 meet the above-mentioned requirements.
- the effective height h and maximum clear aperture d of other lenses of the zoom lens 4 also meet the above requirements.
- the zoom lens 4 controls the ratio of the effective height h of the lens to the maximum clear aperture d to be greater than or equal to 0.45, so that the zoom lens 4 can reduce the lens height to achieve miniaturization while having better optical images.
- the surface shape and resolution are better.
- the effective height h of each lens of the zoom lens 4 satisfies: h ⁇ 6.5 mm.
- the effective height h of the lens may be 3.8 mm, 4 mm, 4.4 mm, 4.8 mm, 5.5 mm, 6.2 mm, 6.5 mm, etc.
- the zoom lens 4 limits the height H of all lenses of the zoom lens 4 by limiting the effective height h of all lenses, so that the size of the zoom lens 4 can better match the miniaturized mobile terminal 100.
- the maximum clear aperture d of each lens of the zoom lens 4 satisfies: d ⁇ 10mm.
- the maximum clear aperture d of the lens can be 7mm, 7.2mm, 8mm, 8.5mm, 9.2mm, 10mm, etc.
- the zoom lens 4 limits the maximum diameter D of all the lenses of the zoom lens 4 by limiting the maximum clear aperture d of all lenses, so that the size of the zoom lens 4 can better match the miniaturized mobile terminal 100. .
- the working F-number of the zoom lens 4 satisfies: 2.0 ⁇ working F-number ⁇ 6.5.
- the working F number refers to the equivalent aperture F number of the lens of the zoom lens 4 after the notch processing.
- the working F number meets the above requirements, the imaging of the zoom lens 4 can obtain better resolution, and the imaging quality is better.
- the working F-number of the zoom lens 4 may be 2.0 at the short focal end and 6.5 at the long focal end.
- the working F number can be 2.8, 2.9, 3.1, 3.5, 3.6, 3.75, 3.8, 3.9, 4.2, 4.45, 4.8, 5.6, etc.
- the lens of the zoom lens 4 may not be cut, and the lens is a circular lens.
- the maximum clear aperture d of each lens of the zoom lens 4 satisfies: d ⁇ 6.5mm.
- the maximum clear aperture d of the lens can be 3.8mm, 4mm, 4.4mm, 4.8mm, 5.5mm, 6.2mm, 6.5mm, etc.
- the module size of the zoom lens 4 is small, which can be well adapted to the miniaturized mobile terminal 100.
- the multiple lens groups of the zoom lens 4 are: the first lens group G1 with positive refractive power, the total length TTL of the zoom lens 4 and the first lens
- the ratio of the focal length f1 of the group G1: TTL/f1 2.14
- the ratio of the second lens group G2 with negative refractive power, the total length TTL of the zoom lens 4 to the focal length f2 of the second lens group G2: TTL/f2 - 6.22
- the zoom lens 4 includes 8 lenses with optical power, and all lenses are designed with an aspheric surface.
- the first lens group G1 includes two lenses (41, 42), along the direction from the object side to the image side, the refractive powers of the two lenses (41, 42) are respectively positive and negative;
- the second lens group G2 includes Two lenses (43, 44), in the direction from the object side to the image side, the refractive powers of the two lenses (43, 44) are negative and positive respectively;
- the third lens group G3 includes four lenses (45, 46, 47, 48), in the direction from the object side to the image side, the refractive powers of the four lenses (45, 46, 47, 48) are positive, positive, negative, and negative respectively.
- the third lens group G3 includes an aperture stop 49 located on the object side of the lens 45 closest to the object side of the third lens group G3.
- the two lenses of the first lens group G1 are made of glass materials, and the other lenses of the zoom lens 4 are made of plastic materials.
- the maximum effective height h of all lenses of the zoom lens 4 is 4.6 mm.
- the maximum clear aperture d of all lenses of the zoom lens 4 is 7 mm.
- Table 1a shows the radius of curvature, interval, refractive index (Nd), Abbe coefficient (Vd).
- the interval includes the thickness (corresponding to d1 to d9) and the distance between the lenses (corresponding to a1 to a9).
- Table 1b shows the aspheric coefficients of each lens.
- all the even-order aspheric surface types z can be defined by but not limited to the following aspheric surface formula:
- z is the vector height of the aspheric surface
- r is the radial coordinate of the aspheric surface
- c is the spherical curvature of the aspheric apex
- K is the quadric constant.
- the value of K is 0, A2, A3, A4, A5, A6 is the aspheric coefficient.
- the ratio of the movement stroke L1 of the second lens group G2 along the optical axis 401 to the total length TTL of the zoom lens 4 from the surface closest to the object side to the imaging surface 21
- 0.059.
- 0.077.
- Table 1c shows the basic parameters of the zoom lens 4
- Table 1d is the separation distance of the lens groups of the zoom lens 4 in multiple magnification states.
- the zoom lens 4 shown in FIG. 4 is simulated, and its simulation effect will be described in detail below with reference to the accompanying drawings.
- FIG. 9 is an axial spherical aberration curve of the zoom lens 4 shown in FIG. 4 at the first magnification.
- the five curves respectively represent the wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm, and the center wavelength is 555nm. It can be seen from Figure 9 that under the normalized aperture coordinates, the defocus of the center wavelength is less than 10um, and any wavelength and The defocus difference of the center wavelength is controlled within a small range.
- FIG. 10 is a distortion curve of the zoom lens 4 shown in FIG. 4 at the first magnification. It can be seen from Figure 10 that the distortion curve shows that the distortion at the maximum image height is controlled within 2%, which meets the imaging requirements.
- FIG. 11 is an axial spherical aberration curve of the zoom lens 4 shown in FIG. 4 at the second magnification.
- the five curves respectively represent the wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm.
- the center wavelength is 555nm. It can be seen from Fig. 11 that under the normalized aperture coordinates, the defocus of the center wavelength is less than 10um, and any wavelength and The defocus difference of the center wavelength is controlled within a small range.
- FIG. 12 is a distortion curve of the zoom lens 4 shown in FIG. 4 at the second magnification. It can be seen from Figure 12 that the distortion curve shows that the distortion at the maximum image height is controlled within 2%, which meets the imaging requirements.
- FIG. 13 is an axial spherical aberration curve of the zoom lens 4 shown in FIG. 4 at the third magnification.
- the five curves respectively represent the wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm, and the center wavelength is 555nm. It can be seen from Figure 13 that under the normalized aperture coordinates, the defocus of the center wavelength is less than 10um, and any wavelength and The defocus difference of the center wavelength is controlled within a small range.
- FIG. 14 is a distortion curve of the zoom lens 4 shown in FIG. 4 at the third magnification. It can be seen from Figure 14 that the distortion curve shows that the distortion at the maximum image height is controlled within 2%, which meets the imaging requirements.
- FIG. 15 is an axial spherical aberration curve of the zoom lens 4 shown in FIG. 4 at the fourth magnification.
- the five curves respectively represent the wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm, and the center wavelength is 555nm. It can be seen from Figure 15 that under the normalized aperture coordinates, the defocus of the center wavelength is less than 10um, and any wavelength and The defocus difference of the center wavelength is controlled within a small range.
- FIG. 16 is a distortion curve of the zoom lens 4 shown in FIG. 4 at the fourth magnification. It can be seen from Figure 16 that the distortion curve shows that the distortion at the maximum image height is controlled within 2%, which meets the imaging requirements.
- FIG. 17 is a schematic structural diagram of a part of the zoom lens 4 shown in FIG. 3 in other embodiments
- FIG. 18 is a schematic structural diagram of a zooming process of the zoom lens 4 shown in FIG. 17.
- FIG. 17 and FIG. 18 mainly illustrate the structure of multiple lens groups of the zoom lens 4, and for convenience of description, the filter 5 and the imaging surface 21 of the camera module 40 are also illustrated at the same time.
- the zoom lens 4 includes a plurality of lens groups, and the plurality of lens groups from the object side to the image side are: the first lens group G1 with positive refractive power, the total length of the zoom lens 4 TTL and the first lens group
- the ratio of the focal length f1 of G1: TTL/f1 1.96
- the ratio of the second lens group G2 with negative refractive power, the total length TTL of the zoom lens 4 to the focal length f2 of the second lens group G2: TTL/f2 -5.57
- the second lens group G2 and the third lens group G3 can move along the optical axis 401, so that the zoom lens 4 realizes continuous zooming.
- the zoom lens 4 includes 7 lenses with optical power, and all lenses are designed with an aspheric surface.
- the first lens group G1 includes two lenses (41, 42). Along the direction from the object side to the image side, the refractive powers of the two lenses (41, 42) are respectively positive and negative;
- the second lens group G2 includes Two lenses (43, 44), in the direction from the object side to the image side, the refractive powers of the two lenses (43, 44) are negative and positive respectively;
- the third lens group G3 includes three lenses (45, 46, 47). In the direction from the object side to the image side, the refractive powers of the three lenses (45, 46, 47) are respectively positive, positive, and negative.
- the third lens group G3 includes an aperture stop 49 located on the object side of the lens 45 closest to the object side of the third lens group G3.
- the two lenses of the first lens group G1 are made of glass materials, and the other lenses of the zoom lens 4 are made of plastic materials.
- the maximum effective height h of all lenses of the zoom lens 4 is 4.6 mm.
- the maximum clear aperture d of all lenses of the zoom lens 4 is 7 mm.
- Table 2a shows the radius of curvature, interval, refractive index (Nd), Abbe coefficient (Vd). Wherein, the interval includes the thickness (corresponding to d1 to d8) and the distance between the lenses (corresponding to a1 to a8).
- Table 2b shows the aspheric coefficients of each lens.
- all the even-order aspheric surface types z can be defined by but not limited to the following aspheric surface formula:
- z is the vector height of the aspheric surface
- r is the radial coordinate of the aspheric surface
- c is the curvature of the apex of the aspheric surface
- K is the quadric constant.
- the value of K is 0, A 2 , A 3 , A 4 , A 5 and A 6 are aspheric coefficients.
- the three focal length states of the zoom lens 4 are shown in FIG. 18, including the first magnification (that is, the short focal end), the second magnification (that is, the intermediate magnification), and the third magnification (that is, the telephoto end). End), the focal length of the zoom lens 4 increases from the first magnification to the third magnification.
- Table 2c shows the basic parameters of the zoom lens 4
- Table 2d is the separation distance of the lens groups of the zoom lens 4 in multiple magnification states.
- the zoom lens 4 shown in FIG. 17 is simulated, and its simulation effect will be described in detail below with reference to the accompanying drawings.
- FIG. 19 is an axial spherical aberration curve of the zoom lens 4 shown in FIG. 17 at the first magnification.
- the five curves respectively represent the wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm.
- the center wavelength is 555nm. It can be seen from Figure 19 that the defocus of the center wavelength is less than 10um under the normalized aperture coordinates. The defocus difference of the center wavelength is controlled within a small range.
- FIG. 20 is a distortion curve of the zoom lens 4 shown in FIG. 17 at the first magnification. It can be seen from Figure 20 that the distortion curve shows that the distortion at the maximum image height is controlled within 2%, which meets the imaging requirements.
- FIG. 21 is an axial spherical aberration curve of the zoom lens 4 shown in FIG. 17 at the second magnification.
- the five curves respectively represent the wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm, and the center wavelength is 555nm. It can be seen from Figure 21 that under the normalized aperture coordinates, the defocus of the center wavelength is less than 10um, and any wavelength and The defocus difference of the center wavelength is controlled within a small range.
- FIG. 22 is a distortion curve of the zoom lens 4 shown in FIG. 17 at the second magnification. It can be seen from Figure 22 that the distortion curve shows that the distortion at the maximum image height is controlled within 2%, which meets the imaging requirements.
- FIG. 23 is an axial spherical aberration curve of the zoom lens 4 shown in FIG. 17 at the third magnification.
- the five curves respectively represent the wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm, and the center wavelength is 555nm.
- the defocus of the center wavelength is less than 10um, and any wavelength and The defocus difference of the center wavelength is controlled within a small range.
- FIG. 24 is a distortion curve of the zoom lens 4 shown in FIG. 17 at the third magnification. It can be seen from Figure 24 that the distortion curve shows that the distortion at the maximum image height is controlled within 2%, which meets the imaging requirements.
- FIG. 25 is a schematic structural diagram of the mobile terminal 100 according to an embodiment of the present application in other embodiments
- FIG. 26 is a partial structure of the mobile terminal 100 shown in FIG. 25 taken along line BB Schematic.
- the mobile terminal 100 of this embodiment includes most of the features of the mobile terminal 100 of the foregoing embodiment. The main differences between the two are mainly described below, and most of the same contents of the two will not be repeated.
- the mobile terminal 100 includes a periscope camera module 40.
- the periscope-type camera module 40 may include most of the features of the camera module 40 in the foregoing embodiment.
- the main difference is that the periscope-type camera module 40 also includes a reflector 6.
- the reflector 6 is located on the object side of the zoom lens 4 and is used to deflect light to the zoom lens 4. As shown in FIG. 26, the light outside the mobile terminal 100 passes through the transparent lens 104 of the mobile terminal 100, and then strikes the reflector 6. The reflector 6 deflects the light to the zoom lens 4.
- the image is formed on the sensor 2, and the camera module 40 realizes light collection.
- the camera module 40 changes the direction of light propagation by setting the reflector 6, so that the direction of the optical axis 401 of the zoom lens 4 can be different from the direction in which external light enters the mobile terminal 100, so that the placement of the camera module 40
- the position, angle, space, etc. are more flexible, and the zoom lens 4 can be applied to the periscope camera module 40.
- the direction of the optical axis of the zoom lens 4 may be parallel to the display screen 20.
- FIG. 27 is a partial structural diagram of the camera module 40 shown in FIG. 26 in some embodiments.
- the reflector 6 is a prism.
- the prism deflects the light to the first lens group G1 of the zoom lens 4. After the light passes through the first lens group G1, the second lens group G2, the third lens group G3, and the filter 5, it is on the imaging surface 21 of the image sensor. Imaging.
- the prism includes two straight edges and one hypotenuse.
- the oblique side may form an angle of 45° with the optical axis of the zoom lens 4, and the angle may also be adjusted as required, for example, forming an angle of 30°, 60°, etc., so that the camera module 40 can realize periscope shooting.
- This application does not strictly limit the structure, hypotenuse position, and angle of the prism.
- FIG. 28 is a partial structural diagram of the camera module 40 shown in FIG. 26 in other embodiments.
- the reflector 6 is a reflector.
- the reflecting mirror deflects the light to the first lens group G1 of the zoom lens 4. After the light passes through the first lens group G1, the second lens group G2, the third lens group G3, and the filter 5, it is on the imaging surface 21 of the image sensor. ⁇ Imaging.
- the mirror surface of the reflector may form an angle of 45° with the optical axis of the zoom lens 4, and the angle may also be adjusted as required, such as forming an angle of 30°, 60°, etc., so that the camera module 40 realizes the potential Look-through shooting.
- This application does not strictly limit the position, angle, etc. of the mirror surface of the reflector.
- the reflecting member 6 includes a prism or a reflecting mirror as an example for description. In some other embodiments, the reflecting member 6 may also include a plurality of prisms or reflecting mirrors. In order to change the propagation direction of the light multiple times, the placement position and angle of the zoom lens 4 are more flexible, and the camera module 40 can realize periscope shooting and is less difficult to assemble.
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Abstract
一种变焦镜头(4)、摄像头模组(40)及移动终端(100)。变焦镜头(4)包括:沿物侧到像侧排列的第一透镜组(G1)、第二透镜组(G2)以及第三透镜组(G3)。第一透镜组(G1)为具有正光焦度的固定透镜组;第二透镜组(G2)为具有负光焦度的变焦透镜组;第三透镜组(G3)为具有正光焦度的补偿透镜组。变焦镜头(4)从短焦端到长焦端的变焦过程中,第二透镜组(G2)沿光轴向像侧移动,第三透镜组(G3)沿光轴向物侧移动。变焦镜头(4)的成像质量较佳。
Description
本申请要求于2020年03月16日提交中国专利局、申请号为202010183912.2、申请名称为“变焦镜头、摄像头模组及移动终端”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。
本申请实施例涉及终端技术领域,尤其涉及一种变焦镜头、摄像头模组及移动终端。
近年来,随着科技的发展,消费者对手机的拍照性能的需求愈来愈高,例如更宽的变焦范围、更高的解析度、更高的成像质量等,这些需求对手机的镜头提出了更高的要求,单个焦段的镜头以及数码变焦的方式已经不能满足消费者的需求。
而目前市场上发布的手机镜头高倍光变基本都是“跳跃式”变焦,即通过分别搭载两到三颗不同焦距的镜头,搭配基于算法的数码变焦,实现混合光学变焦;但是跳跃式数码变焦是基于不同焦距的多个摄像头,依靠算法处理实现连续变焦,并不是实际上的连续变焦,其缺点在于在变焦过程中,其多个摄像头的焦距范围之外的断开部分的成像清晰度,相比于连续光学变焦有所下降,影响到成像质量。
发明内容
本申请实施例提供一种变焦镜头、摄像头模组及移动终端,变焦镜头能够实现连续变焦,以提高成像质量。
第一方面,本申请提供一种变焦镜头。变焦镜头包括:沿物侧到像侧排列的第一透镜组、第二透镜组以及第三透镜组。
第一透镜组为具有正光焦度的固定透镜组。第一透镜组能够汇聚光线,以压缩第二透镜组和第三透镜组的光束口径。第一透镜组在变焦镜头中的位置是固定的。第二透镜组为具有负光焦度的变焦透镜组。第三透镜组为具有正光焦度的补偿透镜组。第二透镜组与第三透镜组互为对焦透镜组。第二透镜组和第三透镜组均能够沿变焦镜头的光轴(后文简称光轴)移动。第二透镜组为变焦透镜组,用于改变光学***的焦距。第三透镜组是补偿透镜组,用于补偿像面位置,使变焦镜头的焦点落于图像传感器的成像面。换言之,第三透镜组能够补偿第二透镜组的调焦范围。第三透镜组还可以用于在变焦时压缩光束角度,以使变焦镜头的主光线角与图像传感器的主光线角相匹配,第三透镜组还可以用于场曲校正,以校正像差。
变焦镜头从短焦端到长焦端的变焦过程中,第二透镜组沿光轴向像侧移动,第三透镜组沿光轴向物侧移动。
在本申请中,变焦镜头设置有可移动的第二透镜组和第三透镜组,变焦镜头能够通过移动第二透镜组和第三透镜组进行连续变焦,从而获得较佳的成像质量。由于第二透镜组和第三透镜组在变焦过程中的移动方向是相反的,因此能够缩短用于驱动第二透镜组移动 的马达的行程和用于驱动第三透镜组移动的马达的行程,以降低马达的设计难度,提高马达的控制精度,进一步提高变焦镜头的成像质量。
由于变焦镜头通过三个透镜组即可实现连续变焦,变焦镜头的透镜组数量少,因此变焦镜头更易组装。此外,变焦镜头的最后一个透镜组是第三透镜组,变焦镜头可以直接对第三透镜组进行主动对准组装,第三透镜组为变焦镜头的核心镜头组,故而变焦镜头的核心透镜组的组装精度能够得到有效保证,变焦镜头的整体组装精度更高,产品良率更高。
一种可能的实现方式中,变焦镜头还包括镜头支座、以及固定于镜头支座内侧的第一镜筒、第一马达以及第二马达。第一透镜组固定于第一镜筒内侧。第二透镜组安装于第一马达,第一马达用于驱动第二透镜组沿光轴移动。第三透镜组安装于第二马达,第二马达用于驱动第三透镜组沿光轴移动。
一种可能的实现方式中,第一透镜组、第二透镜组以及第三透镜组中透镜的总个数N满足:6≤N≤11。
在本实现方式中,变焦镜头的透镜的总个数大于或等于6,从而能够满足三个透镜组的基本光学需求,以确保变焦镜头的成像质量。同时,变焦镜头的透镜的总个数小于或等于11,又能限制变焦镜头的总长度TTL,从而有利于变焦镜头的小型化。
一种可能的实现方式中,第一透镜组包括至少一片具有正光焦度的透镜和至少一片具有负光焦度的透镜,第一透镜组最靠近物侧的透镜具有正光焦度。第二透镜组包括至少一片透镜,第二透镜组最靠近物侧的透镜具有负光焦度。第三透镜组包括至少三片透镜,第三透镜组最靠近物侧的透镜具有正光焦度。
一种可能的实现方式中,第三透镜组包含至少一片具有负光焦度的透镜。此时,具有负光焦度的透镜能够使光线扩散,从而使变焦镜头的成像满足像高需求,也有利于满足第三透镜组的小口径尺寸需求。
一种可能的实现方式中,变焦镜头中包含至少一片采用玻璃材料的透镜。也即,第一透镜组、第二透镜组及第三透镜组中包含至少一片采用玻璃材料的透镜。
在本实现方式中,由于第一透镜组、第二透镜组及第三透镜组设置有至少一片采用玻璃材料的透镜,因此变焦镜头在-25°到60°的温飘能够控制在30μm以内,从而提高对焦体验。
一种可能的实现方式中,变焦镜头从最靠近物侧的表面至成像面的总长度TTL与第一透镜组的焦距f1的比值满足:0.7≤TTL/f1≤3.2。变焦镜头从最靠近物侧的表面至成像面的总长度TTL与第二透镜组的焦距f2的比值满足:-7≤TTL/f2≤-3。变焦镜头从最靠近物侧的表面至成像面的总长度TTL与第三透镜组的焦距f3的比值满足:1.7≤TTL/f3≤4.5。
在本实现方式中,变焦镜头通过控制总长度TTL与三个透镜组的焦距的比值在一定范围内,从而在连续变焦过程中,具备较佳的成像质量。
一种可能的实现方式中,第二透镜组沿光轴的运动行程L1与变焦镜头从最靠近物侧的表面至成像面的总长度TTL的比值满足:|L1/TTL|≤0.3。
在本实现方式中,由于第二透镜组的运动行程L1与变焦镜头的总长度TTL之间的比值小于或等于0.3,因此第二透镜组的运动行程L1能够控制在一个较小的范围内,驱动第二透镜组移动的马达(也即第一马达)的行程要求低,从而降低马达的设计难度,提高马 达的控制精度,进一步提高变焦镜头的成像质量。
一种可能的实现方式中,第三透镜组沿光轴的运动行程L2与变焦镜头从最靠近物侧的表面至成像面的总长度TTL的比值满足:|L2/TTL|≤0.3。
在本实现方式中,由于第三透镜组的运动行程L2与变焦镜头的总长度TTL之间的比值小于或等于0.3,因此第三透镜组的运动行程L2能够控制在一个较小的范围内,驱动第三透镜组移动的马达(也即第二马达)的行程要求低,从而降低马达的设计难度,提高马达的控制精度,进一步提高变焦镜头的成像质量。
一种可能的实现方式中,变焦镜头从最靠近物侧的表面至成像面的总长度TTL与长焦端的焦距Fmax的比值满足:|TTL/Fmax|≤2.0。
在本实现方式中,变焦镜头能够通过较短的总长度TTL实现较长的焦距,从而在保证实现长焦拍摄的情况下,有效降低变焦镜头的尺寸,使得变焦镜头更易安装、适用范围更广。
一种可能的实现方式中,变焦镜头的长焦端的焦距Fmax与短焦端的焦距Fmin的比值满足:Fmax/Fmin≤5.0。
在本实现方式中,通过对长焦端的焦距Fmax和短焦端的焦距Fmin的比值的控制,从而很好地平衡变焦镜头的设计难度和变焦性能需求,使得变焦镜头兼顾性能与成本,具有更佳的产品竞争力。
一种可能的实现方式中,变焦镜头的每片透镜均具有用于降低透镜的高度的切口。
由于变焦镜头中的透镜设有用于降低透镜的高度的切口,因此能够有效缩小光学***高度方向上的尺寸,使得变焦镜头具有较小的高度尺寸,以更好地适用于小型化的移动终端,增加了变焦镜头的适用范围。此外,由于透镜通过切口方式降低其高度,因此透镜可以设置较大的通光口径,从而提高光学***的通光量,使得变焦镜头的成像质量较佳。
一种可能的实现方式中,变焦镜头的每片透镜的有效高度h与最大通光口径d的比值满足:h/d≥0.45。
在本实现方式中,变焦镜头通过控制透镜的有效高度h与最大通光口径d比值大于或等于0.45,使得变焦镜头在降低透镜高度以实现小型化的同时,其光像能够具有较佳的面形、解析力较佳。
一种可能的实现方式中,变焦镜头的每片透镜的有效高度h均满足:h≤6.5mm。在本实现方式中,变焦镜头通过限定所有透镜的有效高度h,限制了变焦镜头的所有透镜的高度H,使得变焦镜头的尺寸能更好地匹配小型化的移动终端。
一种可能的实现方式中,变焦镜头的每片透镜的最大通光口径d均满足:d≤10mm。在本实现方式中,变焦镜头通过限定所有透镜的最大通光口径d,限制了变焦镜头的所有透镜的最大直径D,使得变焦镜头的尺寸能更好地匹配小型化的移动终端。
一种可能的实现方式中,变焦镜头的每片透镜的最大通光口径d均满足:d≤6.5mm。此时,变焦镜头的模组尺寸较小,能很好地适用于小型化的移动终端。
一种可能的实现方式中,第三透镜组包括孔径光阑,第三透镜组包括沿物侧到像侧排列的第一片透镜和第二片透镜。孔径光阑位于第三透镜组的第一片透镜的物侧,或者位于第三透镜组的第一片透镜与第二片透镜之间。
在本实现方式中,通过将孔径光阑设于第三透镜组,使得孔径光阑能够更好地约束光学***内的光线,提高变焦镜头的成像质量。在其他一些实现方式中,孔径光阑也可以位于第三透镜组的第一片透镜与第二片透镜之间。
一种可能的实现方式中,变焦镜头的工作F数满足:2.0≤工作F数≤6.5。
在本实现方式中,工作F数是指变焦镜头的透镜在进行切口处理后的等效光圈F数。当工作F数满足上述要求时,变焦镜头的成像能够获得较佳的解析力,成像质量更佳。
第二方面,本申请还提供一种摄像头模组,包括图像传感器和前述任一项描述的变焦镜头,光线能够穿过变焦镜头照射到图像传感器。摄像头模组采用前述变焦镜头,能够获得较佳的成像质量。
一种可能的实现方式中,摄像头模组还包括棱镜或反射镜,棱镜或反射镜位于变焦镜头的物侧,用于将光线偏转至变焦镜头。
在本实现方式中,摄像头模组通过设置棱镜或反射镜改变光线的传播方向,使得变焦镜头的光轴方向可以与外部光线进入移动终端的方向不同,从而使摄像头模组的放置位置、角度、空间等都更加灵活,变焦镜头能够应用于潜望式摄像头模组中。例如,可以使变焦镜头的光轴方向平行于显示屏。
第三方面,本申请还提供一种移动终端,包括图像处理器和前述任一项描述的摄像头模组,图像处理器与摄像头模组通信连接,图像处理器用于从摄像头模组获取图像数据,并处理图像数据。移动终端的摄像头模组具有较佳的成像质量,用户的拍摄体验较佳。
图1是本申请实施例提供的移动终端在一些实施例中的结构示意图;
图2是图1所示移动终端沿A-A线剖开的部分结构示意图;
图3是图2所示摄像头模组的变焦镜头的结构示意图;
图4是图3所示变焦镜头在一些实施例中的部分结构示意图;
图5是图4所示变焦镜头的变焦过程的结构示意图;
图6是图4所示变焦镜头的第一透镜组的一个透镜的结构示意图;
图7是图6所示透镜在另一角度的结构示意图;
图8是图4所示变焦镜头的第二透镜组的一个透镜的结构示意图;
图9是图4所示变焦镜头在第一倍率下的轴向球差曲线;
图10是图4所示变焦镜头在第一倍率下的畸变曲线;
图11是图4所示变焦镜头在第二倍率下的轴向球差曲线;
图12是图4所示变焦镜头在第二倍率下的畸变曲线;
图13是图4所示变焦镜头在第三倍率下的轴向球差曲线;
图14是图4所示变焦镜头在第三倍率下的畸变曲线;
图15是图4所示变焦镜头在第四倍率下的轴向球差曲线;
图16是图4所示变焦镜头在第四倍率下的畸变曲线;
图17是图3所示变焦镜头在另一些实施例中的部分结构示意图;
图18是图17所示变焦镜头的变焦过程的结构示意图;
图19是图17所示变焦镜头在第一倍率下的轴向球差曲线;
图20是图17所示变焦镜头在第一倍率下的畸变曲线;
图21是图17所示变焦镜头在第二倍率下的轴向球差曲线;
图22是图17所示变焦镜头在第二倍率下的畸变曲线;
图23是图17所示变焦镜头在第三倍率下的轴向球差曲线;
图24是图17所示变焦镜头在第三倍率下的畸变曲线;
图25是本申请实施例提供的移动终端在另一些实施例中的结构示意图;
图26是图25所示移动终端沿B-B线剖开的部分结构示意图;
图27是图26所示摄像头模组在一些实施例中的部分结构示意图;
图28是图26所示摄像头模组在另一些实施例中的部分结构示意图。
下面结合本申请实施例中的附图对本申请实施例进行描述。
为方便理解,下面先对本申请实施例所涉及的英文简写和有关技术术语进行解释和描述。
光焦度,等于像方光束会聚度与物方光束会聚度之差,它表征光学***偏折光线的能力。
具有正光焦度的透镜或透镜组,透镜或透镜组具有正的焦距,具有会聚光线的效果;
具有负光焦度的透镜或透镜组,透镜或透镜组具有负的焦距,具有发散光线的效果;
焦距(focal length),也称为焦长,是光学***中衡量光的聚集或发散的度量方式,指无限远的景物通过透镜或透镜组在焦平面结成清晰影像时,透镜或透镜组的光学中心至焦平面的垂直距离。从实用的角度可以理解为镜头中心至平面的距离。对于定焦镜头来说,其光学中心的位置是固定不变的;对于变焦镜头来说,镜头的光学中心的变化带来镜头焦距的变化。
以透镜或透镜组为界,被摄物体所在的一侧为物侧,被摄物体的图像所在的一侧为像侧;透镜靠近物侧的表面可以称为物侧面,透镜靠近像侧的表面可以称为像侧面。
光圈(Aperture),又称光阑(diaphragm),是用来控制光线透过镜头,进入机身内感光面光量的装置,它通常是在镜头内。
光圈F数(F-number,也称为F值),是镜头的焦距/镜头通光直径得出的相对值(相对孔径的倒数)。光圈F数愈小,在同一单位时间内的进光量便愈多。光圈F数越大,景深越小,拍照的背景内容将会虚化,类似长焦镜头的效果。
工作F数(working F-number,也称为工作F值),是工作状态下镜头的焦距/镜头通光直径得出的相对值(相对孔径的倒数),较多适用于光线被遮挡情况下的光学***。工作F数愈小,在同一单位时间内的进光量便愈多。工作F数越大,景深越小,拍照的背景内容将会虚化,类似长焦镜头的效果。
总长度(total track length,TTL),指镜头最靠近物侧的表面至成像面的总长度,TTL是形成相机高度的主要因素。
成像面,位于变焦镜头中所有透镜的像侧、且光线依次穿过变焦镜头中各透镜后形成 像的载面。
光轴,是一条垂直穿过透镜中心的光线。镜头光轴是通过镜头中心的线。与光轴平行的光线射入凸透镜时,理想的凸透镜应是所有的光线会聚在透镜后的一点,这个会聚所有光线的一点,即为焦点。
阿贝系数,即色散系数,是光学材料在不同波长下的折射率的差值比,代表材料色散程度大小。
球差(spherical aberration),也称为球面像差,是实际像点与理想像点的位置之差。
轴上球差,是实际像点与理想像点的位置在平行于光轴方向上的差。
畸变(distortion),也称为失真,光学***对物体所成的像相对于物体本身而言的失真程度。畸变是由于光阑球差的影响,不同视场的主光线通过光学***后与高斯像面的交点高度不等于理想像高,两者之差就是畸变。因此畸变只改变轴外物点在理想面上的成像位置,使像的形状产生失真,但不影响像的清晰度。
本申请实施例提供一种变焦镜头、应用该变焦镜头的摄像头模组以及包括该摄像头模组的移动终端。变焦镜头包括沿物侧到像侧依次排列的三个透镜组,第二个透镜组和第三个透镜组能够沿光轴移动,使得变焦镜头实现连续变焦,以获得较佳的成像质量。此外,变焦镜头在从短焦端到长焦端的变焦过程中,位于中间的两个透镜组向靠近彼此的方向移动,以实现变焦。由于两个透镜组的移动方向相反,因此能够缩短马达的行程,从而降低马达的设计难度,提高马达的控制精度,进一步提高变焦镜头的成像质量。其中,移动终端可以是手机、平板电脑、手提电脑等具有拍照或摄像功能的设备。
请一并参阅图1和图2,图1是本申请实施例提供的移动终端100在一些实施例中的结构示意图,图2是图1所示移动终端100沿A-A线剖开的部分结构示意图。本实施例中,以移动终端100是手机为例进行描述。
移动终端100包括壳体10、显示屏20、图像处理器30以及摄像头模组40。一些实施例中,壳体10包括边框101和后盖102。边框101与后盖102可以为一体成型结构,也可以通过组装方式形成一体式结构。显示屏20和后盖102分别安装于边框101的两侧,共同围设出整机内腔50。
图像处理器30和摄像头模组40收容于整机内腔50。图像处理器30与摄像头模组40通信连接,图像处理器30用于从摄像头模组40获取图像数据,并处理图像数据。其中,摄像头模组40与图像处理器30的通信连接可以包括通过走线等电连接方式进行数据传输,也可以通过耦合等方式实现数据传输。可以理解的是,摄像头模组40与图像处理器30还可以通过其它能够实现数据传输的方式实现通信连接。
图像处理器30的功能是通过一系列复杂的数学算法运算,对数字图像信号进行优化处理,最后把处理后的信号传到显示器上。图像处理器30可以是图像处理芯片或数字信号处理芯片,它的作用是将感光芯片获得的数据及时快速地传递给中央处理器并刷新感光芯片,因此图像处理器30芯片的好坏,直接影响画面品质(比如色彩饱和度、清晰度等)。
本实施例中,后盖102设有摄像孔103,摄像头模组40通过摄像孔103采集光线,摄像头模组40作为移动终端100的后置摄像头。示例性的,后盖102包括透光镜片104,透 光镜片104安装于摄像孔103,以允许光线穿过,并且能够防尘、防水。在其他一些实施例中,摄像头模组40也可以作为移动终端100的前置摄像头。
可以理解的是,图1所示实施例的移动终端100的摄像头模组40的安装位置仅仅是示意性的,本申请对摄像头模组40的安装位置不做严格限定。在一些其他的实施例中,摄像头模组40也可以安装于移动终端100的其他位置,例如摄像头模组40可以安装于移动终端100背面的上部中间或右上角。在一些其他的实施例中,移动终端100可以包括终端本体和能够相对终端本体转动、移动或拆卸的辅助部件上,摄像头模组40也可以设置在辅助部件上。
一些实施例中,移动终端100还可以包括模数转换器(也可称为A/D转换器,图中未示出)。模数转换器连接于摄像头模组40与图像处理器30之间。模数转换器用于将摄像头模组40产生的信号转换为数字图像信号并传输至图像处理器30,再通过图像处理器30对数字图像信号进行处理,最终通过显示屏20进行图像或者影像显示。
一些实施例中,移动终端100还可以包括存储器(图中未示出),存储器与图像处理器30通信连接,图像处理器30对图像数字信号加工处理以后再将图像传输至存储器中,以便于在后续需要查看图像时能够随时从存储中查找图像并在显示屏20上进行显示。一些实施例中,图像处理器30还会对处理后的图像数字信号进行压缩,再存储至存储器中,以节约存储器空间。
如图2所示,一些实施例中,摄像头模组40包括电路板1、图像传感器2、基座(holder)3、变焦镜头4以及滤光片5。基座3固定于电路板1,图像传感器2固定于电路板1且位于基座3内侧。变焦镜头4安装于基座3,且位于图像传感器2背向电路板1的一侧。图像传感器2位于变焦镜头4的像侧。滤光片5安装于基座3,且位于变焦镜头4与图像传感器2之间。光线能够穿过变焦镜头4照射到图像传感器2的成像面21。示例性的,摄像头模组40的工作原理为:被摄景物反射的光线通过变焦镜头4生成光学图像投射到图像传感器2的成像面21,图像传感器2将光学图像转为电信号即模拟图像信号并传输至模数转换器,以通过模数转换器转换为数字图像信号给图像处理器30。
其中,图像传感器2(也称为感光元件)是一种半导体芯片,表面包含有几十万到几百万的光电二极管,受到光照射时,会产生电荷。图像传感器2可以是电荷耦合器件(charge coupled device,CCD),也可以是互补金属氧化物导体器件(complementary metal-oxide semiconductor,CMOS)。电荷藕合器件使用一种高感光度的半导体材料制成,能把光线转变成电荷。电荷藕合器件由许多感光单位组成,通常以百万像素为单位。当电荷藕合器件表面受到光线照射时,每个感光单位会将电荷反映在组件上,所有的感光单位所产生的信号加在一起,就构成了一幅完整的画面。互补金属氧化物导体器件主要是利用硅和锗这两种元素所做成的半导体,使其在互补金属氧化物导体器件上共存着带N(带-电)和P(带+电)级的半导体,这两个互补效应所产生的电流即可被处理芯片纪录和解读成影像。
变焦镜头4影响成像质量和成像效果,其主要利用透镜的折射原理进行成像,即景物光线通过变焦镜头4,在焦平面上形成清晰的影像,并通过位于焦平面上的图像传感器2记录景物的影像。
滤光片5用于消除投射到图像传感器2上的不必要的光线,防止图像传感器2产生伪 色或波纹,以提高其有效分辨率和彩色还原性。示例性的,滤光片5可以为红外滤光片5。
请参阅图3,图3是图2所示摄像头模组40的变焦镜头4的结构示意图。其中,图3中将变焦镜头4的透镜组中的所有透镜简化成一个透镜的结构进行示意,图3结构并不形成对透镜组中透镜数量和形状的限定。
一些实施例中,变焦镜头4包括沿物侧到像侧排列的第一透镜组G1、第二透镜组G2以及第三透镜组G3。第一透镜组G1为具有正光焦度的固定透镜组。第一透镜组G1能够汇聚光线,以压缩第二透镜组G2和第三透镜组G3的光束口径。第一透镜组G1在变焦镜头4中的位置是固定的。第二透镜组G2为具有负光焦度的变焦透镜组,第三透镜组G3为具有正光焦度的补偿透镜组。第二透镜组G2与第三透镜组G3互为对焦透镜组。第二透镜组G2和第三透镜组G3均能够沿变焦镜头4的光轴401(后文简称光轴401)移动。第二透镜组G2为变焦透镜组,用于改变光学***的焦距。第三透镜组G3是补偿透镜组,用于补偿像面位置,使变焦镜头4的焦点落于图像传感器2的成像面21上。换言之,第三透镜组G3能够补偿第二透镜组G2的调焦范围。第三透镜组G3还可以用于在变焦时压缩光束角度,以使变焦镜头4的主光线角(chief ray angle,CRA)与图像传感器2的主光线角相匹配。第三透镜组G3还可以用于场曲校正,以校正像差。
在本实施例中,变焦镜头4设置有可移动的第二透镜组G2和第三透镜组G3,变焦镜头4能够通过移动第二透镜组G2和第三透镜组G3进行连续变焦,从而获得较佳的成像质量。由于变焦镜头4通过三个透镜组即可实现连续变焦,变焦镜头4的透镜组数量少,因此变焦镜头4更易组装。此外,变焦镜头4的最后一个透镜组是第三透镜组G3,变焦镜头4可以直接对第三透镜组G3进行主动对准(active alignment,AA)组装,第三透镜组G3为变焦镜头4的核心镜头组,故而变焦镜头4的核心透镜组的组装精度能够得到有效保证,变焦镜头4的整体组装精度更高,产品良率更高。
一些实施例中,变焦镜头4还包括镜头支座402、以及固定于镜头支座402内侧的第一镜筒403、第一马达404以及第二马达405。第一透镜组G1固定于第一镜筒403内侧。第二透镜组G2安装于第一马达404,第一马达404用于驱动第二透镜组G2沿光轴401移动。第三透镜组G3安装于第二马达405,第二马达405用于驱动第三透镜组G3沿光轴401移动。可以理解的是,第一马达404和第二马达405的类型可以相同,也可以不同。变焦镜头4中用于安装多个透镜组的结构也可以有其他设计方案,本申请对此不做严格限定。
请参阅图4,图4是图3所示变焦镜头4在一些实施例中的部分结构示意图。其中,图4中主要示意出变焦镜头4的多个透镜组的结构,为方便说明,还同时示意出摄像头模组40的滤光片5和成像面21。
一些实施例中,第一透镜组G1、第二透镜组G2以及第三透镜组G3中透镜的总个数N满足:6≤N≤11。示例性的,如图4所示,变焦镜头4的三个透镜组中透镜的总个数为8片。在其他一些实施例中,变焦镜头4的三个透镜组中的透镜的总个数N也可以为6、7、9、10或11。可以理解的是,在本申请实施例中,变焦镜头4中的透镜均为具有正光焦度或负光焦度的镜片,当在多片透镜之间***平面镜时,平面镜不算作为变焦镜头4的透镜。
在本实施例中,变焦镜头4的透镜的总个数大于或等于6,从而能够满足三个透镜组的基本光学需求,以确保变焦镜头4的成像质量。同时,变焦镜头4的透镜的总个数小于 或等于11,又能限制变焦镜头4的总长度TTL,从而有利于变焦镜头4的小型化。
一些实施例中,第一透镜组G1包括至少一片具有正光焦度的透镜和至少一片具有负光焦度的透镜,第一透镜组G1最靠近物侧的透镜具有正光焦度。示例性的,如图4所示,第一透镜组G1可以包括两片透镜,两片透镜的光焦度可以是一正一负。较为靠近物侧的透镜41具有正光焦度,较为靠近像侧的透镜42具有负光焦度。在其他一些实施例中,第一透镜组G1可以包括三片透镜,三片透镜的光焦度可以是两正一负、或一正两负。三片透镜中最靠近物侧的透镜具有正光焦度。其中,第一透镜组G1中的透镜的光学表面可以是球面或非球面。每个透镜均包括两个光学表面,一个面向物侧,为物侧面,另一个面向像侧,为像侧面。
一些实施例中,第二透镜组G2包括至少一片透镜,第二透镜组G2最靠近物侧的透镜具有负光焦度。示例性的,如图4所示,第二透镜组G2可以包括两片透镜,较为靠近物侧的透镜43具有负光焦度,较为靠近像侧的透镜44可以具有正光焦度或负光焦度。第二透镜组G2中的透镜的光学表面可以是球面或非球面。在其他一些实施例中,第二透镜组G2也可以包括一片、三片或四片透镜。
一些实施例中,第三透镜组G3包括至少三片透镜,第三透镜组G3最靠近物侧的透镜具有正光焦度。其中,第三透镜组G3可以包含至少一片具有负光焦度的透镜。此时,具有负光焦度的透镜能够使光线扩散,从而使变焦镜头4的成像满足像高需求,也有利于满足第三透镜组G3的小口径尺寸需求。
示例性的,如图4所示,第三透镜组G3可以包括四片透镜,四片透镜中最靠近物侧的透镜45具有正光焦度,最为靠近像侧的透镜48具有负光焦度,位于中间的透镜46具有正光焦度、透镜47具有负光焦度。在其他一些实施例中,第三透镜组G3也可以包括三片透镜或五片透镜。
一些实施例中,变焦镜头4从最靠近物侧的表面至成像面21的总长度TTL与第一透镜组G1的焦距f1的比值满足:0.7≤TTL/f1≤3.2。例如,TTL/f1的值可以是0.7、0.9、1.5、1.69、2.26、2.8、3.0、3.2等。
变焦镜头4从最靠近物侧的表面至成像面21的总长度TTL与第二透镜组G2的焦距f2的比值满足:-7≤TTL/f2≤-3。例如,TTL/f2的值可以是-7、-5、-4.6、-4.2、-3.5、-3等。
变焦镜头4从最靠近物侧的表面至成像面21的总长度TTL与第三透镜组G3的焦距f3的比值满足:1.7≤TTL/f3≤4.5。例如,TTL/f3的值可以是1.7、2.3、3.2、3.6、3.89、4.23、4.5等。
在本实施例中,变焦镜头4通过控制总长度TTL与三个透镜组的焦距的比值在一定范围内,从而在连续变焦过程中,具备较佳的成像质量。
一些实施例中,变焦镜头4中包含至少一片采用玻璃材料的透镜。也即,第一透镜组G1、第二透镜组G2及第三透镜组G3中包含至少一片采用玻璃材料的透镜。在本实施例中,由于第一透镜组G1、第二透镜组G2及第三透镜组G3设置有至少一片采用玻璃材料的透镜,因此变焦镜头4在-25°到60°的温飘能够控制在30μm以内,从而提高对焦体验。
其中,采用玻璃材料的透镜的光学表面可以是球面或非球面(asphere)。一些实施例中,第一透镜组G1的沿物侧到像侧排列的第一片透镜和第二片透镜可以采用玻璃材料。另一 些实施例中,第三透镜组G3最靠近物侧的透镜可以采用玻璃材料。
其中,变焦镜头4中的其余透镜可以采用塑料材料,其光学表面可以全部为非球面,非球面设计能够提高变焦镜头4的成像质量。在其他一些实施例中,变焦镜头4的采用塑料材料的透镜的光学表面也可以部分为球面、部分为非球面,或者全部为球面。
一些实施例中,如图4所示,第三透镜组G3包括孔径光阑49。第三透镜组G3包括沿物侧到像侧排列的第一片透镜45和第二片透镜46。孔径光阑49位于第三透镜组G3的第一片透镜45的物侧。在本实施例中,通过将孔径光阑49设于第三透镜组G3,使得孔径光阑49能够更好地约束光学***内的光线,提高变焦镜头4的成像质量。在其他一些实施例中,孔径光阑49也可以位于第三透镜组G3的第一片透镜45与第二片透镜46之间。
一些实施例中,变焦镜头4的总长度TTL满足:TTL≤45mm,有利于变焦镜头4的小型化,使得变焦镜头4能够更好地应用于小型化的移动终端100。
请参阅图5,图5是图4所示变焦镜头4的变焦过程的结构示意图。其中,图5中主要示意出变焦镜头4的透镜组的结构,为方便说明,还同时示意出摄像头模组40的滤光片5和成像面21。
图5中示意出变焦镜头4的四个焦距状态,包括第一倍率(也即短焦端)、第二倍率(也即第一个中间倍率)、第三倍率(也即第二个中间倍率)以及第四倍率(也即长焦端),变焦镜头4从第一倍率调节至第四倍率的过程中,焦距递增。
如图5所示,一些实施例中,变焦镜头4从短焦端到长焦端的变焦过程中,第二透镜组G2沿光轴401向像侧移动,第三透镜组G3沿光轴401向物侧移动。也即,变焦镜头4从短焦端到长焦端的变焦过程中,第二透镜组G2和第三透镜组G3向靠近彼此的方向移动,两者的移动方向是相反的。
变焦镜头4从长焦端到短焦端的变焦过程中,第二透镜组G2沿光轴401向物侧移动,第三透镜组G3沿光轴401向像侧移动。也即,变焦镜头4从短焦端到长焦端的变焦过程中,第二透镜组G2和第三透镜组G3向远离彼此的方向移动,两者的移动方向是相反的。
在本实施例中,由于第二透镜组G2和第三透镜组G3在变焦过程中的移动方向是相反的,因此能够缩短用于驱动第二透镜组G2移动的马达(也即第一马达404)的行程和用于驱动第三透镜组G3移动的马达(也即第二马达405)的行程,以降低马达的设计难度,提高马达的控制精度,进一步提高变焦镜头4的成像质量。
一些实施例中,第二透镜组G2沿光轴401的运动行程L1与变焦镜头4从最靠近物侧的表面至成像面21的总长度TTL的比值满足:|L1/TTL|≤0.3。示例性的,第二透镜组G2沿光轴401的运动行程L1与变焦镜头4的总长度TTL的比值可以满足:0.05≤|L1/TTL|≤0.15。例如,|L1/TTL|的值可以是0.075、0.08、0.095、0.12、0.16、0.25、0.3等。
在本实施例中,由于第二透镜组G2的运动行程L1与变焦镜头4的总长度TTL之间的比值小于或等于0.3,因此第二透镜组G2的运动行程L1能够控制在一个较小的范围内,驱动第二透镜组G2移动的马达(也即第一马达404)的行程要求低,从而降低马达的设计难度,提高马达的控制精度,进一步提高变焦镜头4的成像质量。
一些实施例中,第三透镜组G3沿光轴401的运动行程L2与变焦镜头4从最靠近物侧的表面至成像面21的总长度TTL的比值满足:|L2/TTL|≤0.3。示例性的,第三透镜组G3 沿光轴401的运动行程L2与变焦镜头4的总长度TTL的比值可以满足:0.07≤|L1/TTL|≤0.15。例如,|L1/TTL|的值可以是0.084、0.09、0.13、0.156、0.23、0.26、0.3等。
在本实施例中,由于第三透镜组G3的运动行程L2与变焦镜头4的总长度TTL之间的比值小于或等于0.3,因此第三透镜组G3的运动行程L2能够控制在一个较小的范围内,驱动第三透镜组G3移动的马达(也即第二马达405)的行程要求低,从而降低马达的设计难度,提高马达的控制精度,进一步提高变焦镜头4的成像质量。
一些实施例中,变焦镜头4从最靠近物侧的表面至成像面21的总长度TTL与长焦端的焦距Fmax的比值满足:|TTL/Fmax|≤2.0。例如|TTL/Fmax|的值可以是0.82、0.934、0.96、1.21、1.3、1.42、1.5、1.7、2.0等。
在本实施例中,变焦镜头4能够通过较短的总长度TTL实现较长的焦距,从而在保证实现长焦拍摄的情况下,有效降低变焦镜头4的尺寸,使得变焦镜头4更易安装、适用范围更广。
一些实施例中,变焦镜头4的长焦端的焦距Fmax与短焦端的焦距Fmin的比值满足:Fmax/Fmin≤5.0。例如,Fmax/Fmin的值可以是2.5、3.3、3.7、4.2、5等。
在本实施例中,通过对长焦端的焦距Fmax和短焦端的焦距Fmin的比值的控制,从而很好地平衡变焦镜头4的设计难度和变焦性能需求,使得变焦镜头4兼顾性能与成本,具有更佳的产品竞争力。
请一并参阅图6和图7,图6是图4所示变焦镜头4的第一透镜组G1的一个透镜41的结构示意图,图7是图6所示透镜在另一角度的结构示意图。
一些实施例中,透镜41包括有效光学区41a和围绕有效光学区41a设置的非有效光学区41b。其中,有效光学区41a是用于偏折光线的区域。有效光学区41a也即为光学有效径所在区域。非有效光学区41b是不用于偏折光线、可用于透镜承靠或支撑的区域。非有效光学区41b也即为光学非有效径所在区域。变焦镜头4中的其他透镜的有效光学区和非有效光学区做相同定义。
一些实施例中,第一透镜组G1的每片透镜均具有用于降低透镜的高度的切口。第一透镜组G1包含的每片透镜的切口部分位于有效光学区、部分位于非有效光学区。如图7所示,第一透镜组G1的透镜41具有切口411。切口411的数量为两个,两个切口411分别设于透镜41的两侧,且切口平面相互平行。透镜41的高度H为透镜41整体在切口平面的垂直方向上的尺寸。透镜41的有效高度h为透镜41的有效光学区41a在切口平面的垂直方向上的尺寸。图7所示透镜41的有效高度h与高度H相同。透镜41的最大通光口径d为透镜41的有效光学区41a的最大直径。透镜41的最大直径D为透镜整体的直径尺寸。变焦镜头4中的其他透镜的有效高度h、高度H、最大通光口径d以及最大直径D做相同定义。其他一些实施例中,切口411的数量也可以是一个。
在本实施例中,由于第一透镜组G1的透镜的尺寸较大,因此切口部分位于有效光学区、部分位于非有效光学区,虽然会在一定程度上降低变焦镜头4的像面解析度和照度,但是能够较大幅度地降低第一透镜组G1的透镜的高度,从而较大幅度地缩小变焦镜头4的高度,有利于变焦镜头4小型化。
请参阅图8,图8是图4所示变焦镜头4的第二透镜组G2的一个透镜43的结构示意 图。
一些实施例中,第二透镜组G2的每片透镜均具有用于降低透镜的高度的切口。第二透镜组G2包含的每片透镜的切口位于非有效光学区。如图8所示,第二透镜组G2的透镜43具有切口431。切口431的数量为两个,两个切口431分别设于透镜43的两侧,且切口平面相互平行。切口431位于透镜43的非有效光学区43b。其他一些实施例中,切口431的数量也可以是一个。
在本实施例中,由于第二透镜组G2的透镜的尺寸较小,第二透镜组G2的切口且与非有效光学区,因此透镜上的切口既可以降低第二透镜组G2的透镜的高度,也不会影响到变焦镜头4的成像品质。
如图8所示,本实施例中,第二透镜组G2的透镜43的有效高度h与最大通光口径d相等。其中,第二透镜组G2的透镜43的有效高度h所在方向与第一透镜组G1的透镜41的有效高度h所在方向一致。透镜43的有效高度h小于透镜43的高度H。
一些实施例中,第三透镜组G3的每片透镜均具有用于降低透镜的高度的切口。第三透镜组G3包含的每片透镜的切口位于非有效光学区。在本实施例中,由于第三透镜组G3的透镜的尺寸较小,第三透镜组G3的切口且与非有效光学区,因此透镜切口既可以降低第二透镜组G2的透镜的高度,也不会影响到变焦镜头4的成像品质。
一些实施例中,如上文描述,变焦镜头4的每片透镜均具有用于降低透镜的高度的切口。切口可通过I-CUT工艺实现。由于变焦镜头4中的透镜设有用于降低透镜的高度的切口,因此能够有效缩小光学***高度方向上的尺寸,使得变焦镜头4具有较小的高度尺寸,以更好地适用于小型化的移动终端100,增加了变焦镜头4的适用范围。此外,由于透镜通过切口方式降低其高度,因此透镜可以设置较大的通光口径,从而提高光学***的通光量,使得变焦镜头4的成像质量较佳。
一些实施例中,变焦镜头4的每片透镜的有效高度h与最大通光口径d的比值满足:h/d≥0.45。例如,h/d的值可以是0.45、0.5、0.52、0.6、0.68、0.8等。如图7和图8所示,透镜41和透镜43的有效高度h与最大通光口径d满足上述需求。同样的,变焦镜头4的其他透镜的有效高度h与最大通光口径d也满足上述需求。
在本实施例中,变焦镜头4通过控制透镜的有效高度h与最大通光口径d比值大于或等于0.45,使得变焦镜头4在降低透镜高度以实现小型化的同时,其光像能够具有较佳的面形、解析力较佳。
一些实施例中,变焦镜头4的每片透镜的有效高度h均满足:h≤6.5mm。例如,透镜的有效高度h可以是3.8mm、4mm、4.4mm、4.8mm、5.5mm、6.2mm、6.5mm等。在本实施例中,变焦镜头4通过限定所有透镜的有效高度h,限制了变焦镜头4的所有透镜的高度H,使得变焦镜头4的尺寸能更好地匹配小型化的移动终端100。
一些实施例中,变焦镜头4的每片透镜的最大通光口径d均满足:d≤10mm。例如,透镜的最大通光口径d可以是7mm、7.2mm、8mm、8.5mm、9.2mm、10mm等。在本实施例中,变焦镜头4通过限定所有透镜的最大通光口径d,限制了变焦镜头4的所有透镜的最大直径D,使得变焦镜头4的尺寸能更好地匹配小型化的移动终端100。
一些实施例中,变焦镜头4的工作F数满足:2.0≤工作F数≤6.5。在本实施例中,工 作F数是指变焦镜头4的透镜在进行切口处理后的等效光圈F数。当工作F数满足上述要求时,变焦镜头4的成像能够获得较佳的解析力,成像质量更佳。示例性的,变焦镜头4的工作F数在短焦端可以为2.0,在长焦端可以为6.5。变焦镜头4处于其他倍率状态时,工作F数可以为2.8、2.9、3.1、3.5、3.6、3.75、3.8、3.9、4.2、4.45、4.8、5.6等。
在其他一些实施例中,变焦镜头4的透镜可以不做切口处理,透镜为圆形镜片。其中,变焦镜头4的每片透镜的最大通光口径d均满足:d≤6.5mm。例如,透镜的最大通光口径d可以是3.8mm、4mm、4.4mm、4.8mm、5.5mm、6.2mm、6.5mm等。此时,变焦镜头4的模组尺寸较小,能很好地适用于小型化的移动终端100。
为方便理解本申请实施例提供的变焦镜头4的效果,下面结合具体的实施例对变焦镜头4成像效果进行详细的说明。
一些实施例中,请再次参阅图4,变焦镜头4的多个透镜组从物侧到像侧依次为:具备正光焦度的第一透镜组G1,变焦镜头4的总长度TTL与第一透镜组G1的焦距f1的比值:TTL/f1=2.14;具有负光焦度的第二透镜组G2,变焦镜头4的总长度TTL与第二透镜组G2的焦距f2的比值:TTL/f2=-6.22;具有正光焦度的第三透镜组G3,变焦镜头4的总长度TTL与第三透镜组G3的焦距f3的比值:TTL/f3=3.83。
变焦镜头4包括8个具有光焦度的透镜,所有透镜均采用非球面设计。其中,第一透镜组G1包含两片透镜(41、42),沿物侧到像侧的方向,两片透镜(41、42)的光焦度分别为正、负;第二透镜组G2包含两片透镜(43、44),沿物侧到像侧的方向,两片透镜(43、44)的光焦度分别为负、正;第三透镜组G3包含四片透镜(45、46、47、48),沿物侧到像侧的方向,四片透镜(45、46、47、48)的光焦度分别为正、正、负、负。第三透镜组G3包括孔径光阑49,孔径光阑49位于第三透镜组G3的最靠近物侧的透镜45的物侧。第一透镜组G1的两片透镜均采用玻璃材料,变焦镜头4的其他透镜采用塑料材料。变焦镜头4的所有透镜的最大有效高度h为4.6mm。变焦镜头4的所有透镜的最大通光口径d为7mm。
请一并参考表1a及表1b,其中,表1a为处于第一倍率(短焦端)状态下的变焦镜头4的各透镜和滤光片5的曲率半径、间隔、折射率(Nd)、阿贝系数(Vd)。其中,间隔包括厚度(对应于d1至d9)和镜片之间的间距(对应于a1至a9)。表1b为各透镜的非球面系数。
表1a
表1b
A 2 | A 3 | A 4 | A 5 | A 6 | |
S1 | 2.4431E-04 | -1.3605E-05 | 3.2713E-06 | -5.1859E-07 | 3.6765E-08 |
S2 | 8.5930E-04 | 3.5253E-06 | -1.0917E-06 | 7.7315E-08 | -3.8615E-09 |
S3 | -2.2279E-05 | 3.1213E-05 | 1.4546E-06 | -1.2206E-07 | 8.3020E-09 |
S4 | 5.7610E-05 | 4.6182E-07 | 7.8737E-06 | -9.2620E-07 | 6.7697E-08 |
S5 | 1.1109E-03 | 1.7967E-04 | -3.0778E-05 | 2.1576E-06 | -1.0112E-07 |
S6 | -1.8258E-03 | -1.4022E-04 | -5.0866E-05 | 4.6710E-06 | -1.8971E-06 |
S7 | -3.5014E-03 | -4.5011E-04 | -1.3291E-05 | 7.0722E-07 | -2.8105E-07 |
S8 | -4.0815E-03 | -1.0674E-04 | -9.2967E-06 | 4.2232E-06 | 4.3140E-08 |
S9 | -9.1747E-05 | 2.0427E-05 | 8.9724E-06 | -6.3055E-07 | 3.7225E-08 |
S10 | 2.6558E-03 | -1.0465E-05 | 3.9708E-06 | -5.3621E-07 | 3.1918E-07 |
S11 | 2.5452E-04 | 1.3098E-04 | 2.8114E-05 | -3.1038E-06 | -1.2903E-06 |
S12 | -6.3607E-04 | -8.6718E-05 | 4.9199E-06 | 1.7262E-05 | 2.6828E-06 |
S13 | 2.1100E-03 | -7.3888E-04 | 1.2962E-04 | -1.8314E-05 | 9.5404E-06 |
S14 | 7.2169E-03 | -1.9541E-03 | 1.7804E-04 | -4.9392E-06 | -2.5584E-08 |
S15 | 9.1060E-03 | -2.9168E-03 | 3.9342E-04 | -2.3855E-05 | 5.3626E-07 |
S16 | 3.4667E-03 | -9.2570E-04 | 1.9490E-04 | -1.6261E-05 | 9.7289E-07 |
由表1a可得,变焦镜头4从最靠近物侧的表面至成像面21的总长度TTL=28.3741mm。
表1b中所示的变焦镜头4的16个非球面中,所有偶次非球面面型z可利用但不限于以下非球面公式进行限定:
其中,z为非球面的矢高,r为非球面的径向坐标,c为非球面顶点球曲率,K为二次曲面常数,本实施例中K值为0,A2、A3、A4、A5、A6为非球面系数。
由图5可以看出,变焦镜头4在短焦端向长焦端变焦的过程中,第二透镜组G2向像侧移动,第三透镜组G3向物侧移动。
其中,第二透镜组G2沿光轴401的运动行程L1与变焦镜头4从最靠近物侧的表面至成像面21的总长度TTL的比值:|L1/TTL|=0.059。第三透镜组G3沿光轴401的运动行程L2与变焦镜头4从最靠近物侧的表面至成像面21的总长度TTL的比值:|L2/TTL|=0.077。
变焦镜头4从最靠近物侧的表面至成像面21的总长度TTL与长焦端的焦距Fmax的比值:|TTL/Fmax|=0.978。
请一并参考表1c和表1d,其中,表1c示出了变焦镜头4的基本参数,表1d为变焦镜头4在多个倍率状态下的透镜组的间隔距离。
表1c
倍率 | 一 | 二 | 三 | 四 |
焦距/mm | 15 | 18.5 | 23.5 | 29 |
工作F数 | 3.5 | 3.5 | 3.7 | 3.9 |
像高IMH | 2.5mm | 2.5mm | 2.5mm | 2.5mm |
表1d
对图4所示的变焦镜头4进行仿真,下面结合附图详细说明对其仿真效果。
请参阅图9,图9是图4所示变焦镜头4在第一倍率下的轴向球差曲线。其中,五条曲线分别表示650nm、610nm、555nm、510nm和470nm波长,中心波长为555nm,由图9中可以看出,在归一化孔径坐标下,中心波长的离焦量小于10um,任意波长和中心波长的离焦量差值均在控制在一个较小的范围内。
请参阅图10,图10是图4所示变焦镜头4在第一倍率下的畸变曲线。由图10中可以看出,畸变曲线显示最大像高处的畸变控制在2%以内,满足成像要求。
请参阅图11,图11是图4所示变焦镜头4在第二倍率下的轴向球差曲线。其中,五条曲线分别表示650nm、610nm、555nm、510nm和470nm波长,中心波长为555nm,由图11中可以看出,在归一化孔径坐标下,中心波长的离焦量小于10um,任意波长和中心波长的离焦量差值均在控制在一个较小的范围内。
请参阅图12,图12是图4所示变焦镜头4在第二倍率下的畸变曲线。由图12中可以看出,畸变曲线显示最大像高处的畸变控制在2%以内,满足成像要求。
请参阅图13,图13是图4所示变焦镜头4在第三倍率下的轴向球差曲线。其中,五条曲线分别表示650nm、610nm、555nm、510nm和470nm波长,中心波长为555nm,由图13中可以看出,在归一化孔径坐标下,中心波长的离焦量小于10um,任意波长和中心波长的离焦量差值均在控制在一个较小的范围内。
请参阅图14,图14是图4所示变焦镜头4在第三倍率下的畸变曲线。由图14中可以看出,畸变曲线显示最大像高处的畸变控制在2%以内,满足成像要求。
请参阅图15,图15是图4所示变焦镜头4在第四倍率下的轴向球差曲线。其中,五条曲线分别表示650nm、610nm、555nm、510nm和470nm波长,中心波长为555nm,由图15中可以看出,在归一化孔径坐标下,中心波长的离焦量小于10um,任意波长和中心波长的离焦量差值均在控制在一个较小的范围内。
请参阅图16,图16是图4所示变焦镜头4在第四倍率下的畸变曲线。由图16中可以看出,畸变曲线显示最大像高处的畸变控制在2%以内,满足成像要求。
请一并参阅图17和图18,图17是图3所示变焦镜头4在另一些实施例中的部分结构示意图,图18是图17所示变焦镜头4的变焦过程的结构示意图。其中,图17和图18中主要示意出变焦镜头4的多个透镜组的结构,为方便说明,还同时示意出摄像头模组40的滤光片5和成像面21。
一些实施例中,变焦镜头4包括多个透镜组,多个透镜组从物侧到像侧依次为:具备正光焦度的第一透镜组G1,变焦镜头4的总长度TTL与第一透镜组G1的焦距f1的比值:TTL/f1=1.96;具有负光焦度的第二透镜组G2,变焦镜头4的总长度TTL与第二透镜组G2的焦距f2的比值:TTL/f2=-5.57;具有正光焦度的第三透镜组G3,变焦镜头4的总长度TTL与第三透镜组G3的焦距f3的比值:TTL/f3=3.93。第二透镜组G2和第三透镜组G3能够沿光轴401移动,使得变焦镜头4实现连续变焦。
变焦镜头4包括7个具有光焦度的透镜,所有透镜均采用非球面设计。其中,第一透镜组G1包含两片透镜(41、42),沿物侧到像侧的方向,两片透镜(41、42)的光焦度分别为正、负;第二透镜组G2包含两片透镜(43、44),沿物侧到像侧的方向,两片透镜(43、44)的光焦度分别为负、正;第三透镜组G3包含三片透镜(45、46、47),沿物侧到像侧的方向,三片透镜(45、46、47)的光焦度分别为正、正、负。第三透镜组G3包括孔径光阑49,孔径光阑49位于第三透镜组G3的最靠近物侧的透镜45的物侧。第一透镜组G1的两片透镜均采用玻璃材料,变焦镜头4的其他透镜采用塑料材料。变焦镜头4的所有透镜的最大有效高度h为4.6mm。变焦镜头4的所有透镜的最大通光口径d为7mm。
请一并参考表2a及表2b,其中,表2a为处于第一倍率(短焦端)状态下的变焦镜头4的各透镜和滤光片5的曲率半径、间隔、折射率(Nd)、阿贝系数(Vd)。其中,间隔包括厚度(对应于d1至d8)和镜片之间的间距(对应于a1至a8)。表2b为各透镜的非球面系数。
表2a
表2b
A 2 | A 3 | A 4 | A 5 | A 6 | |
S1 | 7.7258E-04 | 9.4033E-06 | 5.6372E-07 | 8.2522E-08 | 4.3584E-09 |
S2 | 3.2303E-03 | -4.4331E-06 | -3.1125E-06 | 3.5531E-07 | -1.2414E-08 |
S3 | -1.2917E-03 | 1.2299E-04 | 1.0540E-06 | -7.9510E-07 | 2.5310E-08 |
S4 | -2.5147E-03 | 1.4982E-04 | 1.0347E-05 | -2.0346E-06 | 9.4795E-08 |
S5 | -3.3338E-05 | 2.8261E-04 | -2.0895E-05 | -1.1744E-06 | 1.8988E-07 |
S6 | -8.6280E-03 | -1.8896E-04 | -4.3557E-05 | -1.1069E-05 | 1.9091E-06 |
S7 | -8.4006E-03 | -5.0089E-04 | -6.0653E-05 | -2.0726E-06 | 5.0352E-07 |
S8 | -4.0294E-03 | 1.5644E-05 | -6.1672E-05 | 8.1074E-06 | -5.5763E-07 |
S9 | 3.8711E-04 | -2.9561E-05 | 5.0459E-05 | -1.9233E-06 | 3.7251E-07 |
S10 | 2.2702E-03 | 1.2971E-03 | -1.3428E-04 | 1.8174E-05 | -1.2587E-06 |
S11 | -2.6706E-03 | 1.5754E-03 | -3.4675E-04 | 2.9474E-05 | -3.4213E-06 |
S12 | -2.3288E-03 | 2.1220E-03 | -5.9465E-04 | 4.8581E-05 | -2.3181E-06 |
S13 | 5.9017E-03 | 1.4073E-03 | -3.5923E-04 | 4.0329E-05 | -2.3486E-06 |
S14 | 5.5519E-03 | 1.3915E-04 | 1.0388E-05 | 6.4525E-06 | -5.5151E-07 |
由表2a可得,变焦镜头4从最靠近物侧的表面至成像面21的总长度TTL=26.3195mm。
表2b中所示的变焦镜头4的14个非球面中,所有偶次非球面面型z可利用但不限于以下非球面公式进行限定:
其中,z为非球面的矢高,r为非球面的径向坐标,c为非球面顶点球曲率,K为二次曲面常数,本实施例中K值为0,A
2、A
3、A
4、A
5、A
6为非球面系数。
如图18所示,图18中示意出变焦镜头4的三个焦距状态,包括第一倍率(也即短焦端)、第二倍率(也即中间倍率)以及第三倍率(也即长焦端),变焦镜头4从第一倍率调节至第三倍率的过程中,焦距递增。
由图18可以看出,变焦镜头4在短焦端向长焦端变焦的过程中,第二透镜组G2向像侧移动,第三透镜组G3向物侧移动。第二透镜组G2沿光轴401的运动行程L1与变焦镜头4从最靠近物侧的表面至成像面21的总长度TTL的比值:|L1/TTL|=0.072。第三透镜组G3沿光轴401的运动行程L2与变焦镜头4从最靠近物侧的表面至成像面21的总长度TTL的比值:
|L2/TTL|=0.084。变焦镜头4从最靠近物侧的表面至成像面21的总长度TTL与长焦端的焦距Fmax的比值:|TTL/Fmax|=1.1。
请一并参考表2c和表2d,其中,表2c示出了变焦镜头4的基本参数,表2d为变焦镜头4在多个倍率状态下的透镜组的间隔距离。
表2c
倍率 | 一 | 二 | 三 |
焦距/mm | 15 | 17 | 23.5 |
工作F数 | 3.5 | 3.5 | 3.8 |
像高IMH | 3.28mm | 3.28mm | 3.28mm |
表2d
对图17所示的变焦镜头4进行仿真,下面结合附图详细说明对其仿真效果。
请参阅图19,图19是图17所示变焦镜头4在第一倍率下的轴向球差曲线。其中,五条曲线分别表示650nm、610nm、555nm、510nm和470nm波长,中心波长为555nm,由图19中可以看出,在归一化孔径坐标下,中心波长的离焦量小于10um,任意波长和中心 波长的离焦量差值均在控制在一个较小的范围内。
请参阅图20,图20是图17所示变焦镜头4在第一倍率下的畸变曲线。由图20中可以看出,畸变曲线显示最大像高处的畸变控制在2%以内,满足成像要求。
请参阅图21,图21是图17所示变焦镜头4在第二倍率下的轴向球差曲线。其中,五条曲线分别表示650nm、610nm、555nm、510nm和470nm波长,中心波长为555nm,由图21中可以看出,在归一化孔径坐标下,中心波长的离焦量小于10um,任意波长和中心波长的离焦量差值均在控制在一个较小的范围内。
请参阅图22,图22是图17所示变焦镜头4在第二倍率下的畸变曲线。由图22中可以看出,畸变曲线显示最大像高处的畸变控制在2%以内,满足成像要求。
请参阅图23,图23是图17所示变焦镜头4在第三倍率下的轴向球差曲线。其中,五条曲线分别表示650nm、610nm、555nm、510nm和470nm波长,中心波长为555nm,由图23中可以看出,在归一化孔径坐标下,中心波长的离焦量小于10um,任意波长和中心波长的离焦量差值均在控制在一个较小的范围内。
请参阅图24,图24是图17所示变焦镜头4在第三倍率下的畸变曲线。由图24中可以看出,畸变曲线显示最大像高处的畸变控制在2%以内,满足成像要求。
请一并参阅图25和图26,图25是本申请实施例提供的移动终端100在另一些实施例中的结构示意图,图26是图25所示移动终端100沿B-B线剖开的部分结构示意图。本实施例移动终端100包括前述实施例移动终端100的大部分特征,以下主要阐述两者的主要区别,两者相同的大部分内容不再赘述。
移动终端100包括潜望式的摄像头模组40。潜望式的摄像头模组40可以包括前述实施例摄像头模组40的大部分特征,主要区别在于:潜望式的摄像头模组40还包括反射件6。反射件6位于变焦镜头4的物侧,用于将光线偏转至变焦镜头4。如图26所示,移动终端100外部的光线穿过移动终端100的透光镜片104后,射向反射件6,反射件6将光线偏转至变焦镜头4,光线穿过变焦镜头4后在图像传感器2上成像,摄像头模组40实现光线采集。
在本实施例中,摄像头模组40通过设置反射件6改变光线的传播方向,使得变焦镜头4的光轴401方向可以与外部光线进入移动终端100的方向不同,从而使摄像头模组40的放置位置、角度、空间等都更加灵活,变焦镜头4能够应用于潜望式摄像头模组40中。例如,可以使变焦镜头4的光轴方向平行于显示屏20。
请参阅图27,图27是图26所示摄像头模组40在一些实施例中的部分结构示意图。
一些实施例中,反射件6为棱镜。棱镜将光线偏转至变焦镜头4的第一透镜组G1,光线依次经过第一透镜组G1、第二透镜组G2、第三透镜组G3及滤光片5后,在图像传感器的成像面21上成像。
示例性的,棱镜包括两个直边和一个斜边,光线经一个直边进入棱镜,被斜边反射后,由另一个直边射出棱镜。斜边可以与变焦镜头4的光轴成45°夹角,该夹角也可以根据需要调整,例如形成30°、60°夹角等,从而使摄像头模组40实现潜望式拍摄。本申请不对棱镜的结构、斜边位置、角度做严格限定。
请参阅图28,图28是图26所示摄像头模组40在另一些实施例中的部分结构示意图。
一些实施例中,反射件6为反射镜。反射镜将光线偏转至变焦镜头4的第一透镜组G1,光线依次经过第一透镜组G1、第二透镜组G2、第三透镜组G3及滤光片5后,在图像传感器的成像面21上成像。
示例性的,反射镜的镜面可以与变焦镜头4的光轴成45°夹角,该夹角也可以根据需要调整,例如形成30°、60°夹角等,从而使摄像头模组40实现潜望式拍摄。本申请不对反射镜的镜面位置、角度等做严格限定。
可以理解的是,图27和图28所示实施例中,反射件6以包括一个棱镜或反射镜为例进行说明,在其他一些实施例中,反射件6也可以包括多个棱镜或反射镜,以多次改变光线的传播方向,使得变焦镜头4的摆放位置、角度等更为灵活,摄像头模组40能够实现潜望式拍摄且组装难度较小。
以上所述,仅为本申请的具体实施方式,但本申请的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本申请揭露的技术范围内,可轻易想到变化或替换,都应涵盖在本申请的保护范围之内;在不冲突的情况下,本申请的实施例及实施例中的特征可以相互组合。因此,本申请的保护范围应以所述权利要求的保护范围为准。
Claims (20)
- 一种变焦镜头,其特征在于,包括:沿物侧到像侧排列的第一透镜组、第二透镜组以及第三透镜组;其中,所述第一透镜组为具有正光焦度的固定透镜组;所述第二透镜组为具有负光焦度的变焦透镜组;所述第三透镜组为具有正光焦度的补偿透镜组;所述变焦镜头从短焦端到长焦端的变焦过程中,所述第二透镜组沿光轴向像侧移动,所述第三透镜组沿光轴向物侧移动。
- 根据权利要求1所述的变焦镜头,其特征在于,所述第一透镜组、所述第二透镜组以及所述第三透镜组中透镜的总个数N满足:6≤N≤11。
- 根据权利要求1或2所述的变焦镜头,其特征在于,所述第一透镜组包括至少一片具有正光焦度的透镜和至少一片具有负光焦度的透镜,所述第一透镜组最靠近物侧的透镜具有正光焦度;所述第二透镜组包括至少一片透镜,所述第二透镜组最靠近物侧的透镜具有负光焦度;所述第三透镜组包括至少三片透镜,所述第三透镜组最靠近物侧的透镜具有正光焦度。
- 根据权利要求3所述的变焦镜头,其特征在于,所述第三透镜组包含至少一片具有负光焦度的透镜。
- 根据权利要求1至4中任一项所述的变焦镜头,其特征在于,所述变焦镜头中包含至少一片采用玻璃材料的透镜。
- 根据权利要求1至5中任一项所述的变焦镜头,其特征在于,所述变焦镜头从最靠近物侧的表面至成像面的总长度TTL与所述第一透镜组的焦距f1的比值满足:0.7≤TTL/f1≤3.2;所述变焦镜头从最靠近物侧的表面至成像面的总长度TTL与所述第二透镜组的焦距f2的比值满足:-7≤TTL/f2≤-3;所述变焦镜头从最靠近物侧的表面至成像面的总长度TTL与所述第三透镜组的焦距f3的比值满足:1.7≤TTL/f3≤4.5。
- 根据权利要求1至6中任一项所述的变焦镜头,其特征在于,所述第二透镜组沿光轴的运动行程L1与所述变焦镜头从最靠近物侧的表面至成像面的总长度TTL的比值满足:|L1/TTL|≤0.3。
- 根据权利要求1至7中任一项所述的变焦镜头,其特征在于,所述第三透镜组沿光轴的运动行程L2与所述变焦镜头从最靠近物侧的表面至成像面的总长度TTL的比值满足:|L2/TTL|≤0.3。
- 根据权利要求1至8中任一项所述的变焦镜头,其特征在于,所述变焦镜头从最靠近物侧的表面至成像面的总长度TTL与长焦端的焦距Fmax的比值满足:|TTL/Fmax|≤2.0。
- 根据权利要求1至9中任一项所述的变焦镜头,其特征在于,所述变焦镜头的长焦端的焦距Fmax与短焦端的焦距Fmin的比值满足:Fmax/Fmin≤5.0。
- 根据权利要求1至10中任一项所述的变焦镜头,其特征在于,所述变焦镜头的每片透镜均具有用于降低透镜的高度的切口。
- 根据权利要求11所述的变焦镜头,其特征在于,所述变焦镜头的每片透镜的有效高度h与最大通光口径d的比值满足:h/d≥0.45。
- 根据权利要求11或12所述的变焦镜头,其特征在于,所述变焦镜头的每片透镜的有效高度h均满足:h≤6.5mm。
- 根据权利要求11至13中任一项所述的变焦镜头,其特征在于,所述变焦镜头的每片透镜的最大通光口径d均满足:d≤10mm。
- 根据权利要求1至10中任一项所述的变焦镜头,其特征在于,所述变焦镜头的每片透镜的最大通光口径d均满足:d≤6.5mm。
- 根据权利要求1至15任一项所述的变焦镜头,其特征在于,所述第三透镜组包括孔径光阑,所述第三透镜组包括沿物侧到像侧排列的第一片透镜和第二片透镜;所述孔径光阑位于所述第三透镜组的第一片透镜的物侧,或者位于所述第三透镜组的第一片透镜与第二片透镜之间。
- 根据权利要求1至16任一项所述的变焦镜头,其特征在于,所述变焦镜头的工作F数满足:2.0≤工作F数≤6.5。
- 一种摄像头模组,其特征在于,包括图像传感器和权利要求1至17中任一项所述的变焦镜头,光线能够穿过所述变焦镜头照射到所述图像传感器。
- 根据权利要求18所述的摄像头模组,其特征在于,所述摄像头模组还包括棱镜或反射镜,所述棱镜或反射镜位于所述变焦镜头的物侧,用于将光线偏转至所述变焦镜头。
- 一种移动终端,其特征在于,包括图像处理器和权利要求18或19所述的摄像头模组,所述图像处理器与所述摄像头模组通信连接,所述图像处理器用于从所述摄像头模组获取图像数据,并处理所述图像数据。
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