CN116661115A - Optical system, lens module and electronic equipment - Google Patents

Optical system, lens module and electronic equipment Download PDF

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Publication number
CN116661115A
CN116661115A CN202211696306.6A CN202211696306A CN116661115A CN 116661115 A CN116661115 A CN 116661115A CN 202211696306 A CN202211696306 A CN 202211696306A CN 116661115 A CN116661115 A CN 116661115A
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CN
China
Prior art keywords
free
prism
optical system
freeform
form surface
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211696306.6A
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Chinese (zh)
Inventor
于建冬
翟羽佳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honor Device Co Ltd
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Honor Device Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honor Device Co Ltd filed Critical Honor Device Co Ltd
Priority to CN202211696306.6A priority Critical patent/CN116661115A/en
Publication of CN116661115A publication Critical patent/CN116661115A/en
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/08—Catadioptric systems
    • G02B17/0836—Catadioptric systems using more than three curved mirrors
    • 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
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/11—Anti-reflection coatings
    • 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
    • G02B13/007—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 the beam folding prism having at least one curved surface
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • 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
    • G03B17/12—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets
    • 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

Abstract

The application discloses an optical system, a lens module and electronic equipment, which belong to the technical field of cameras, wherein the optical system comprises: the optical system comprises a first free-form surface prism and a second free-form surface prism, wherein the first free-form surface prism and the second free-form surface prism share a first curved surface, the first free-form surface prism is configured to reflect object light twice and then transmit the object light to the second free-form surface prism through the first curved surface, and the second free-form surface prism is configured to reflect the object light transmitted from the first curved surface once. The lens module includes: an image sensor for capturing the object light projected onto a surface of the image sensor, and the optical system. The electronic equipment comprises the lens module. The application can increase the focal length of the optical system to meet the requirement of high magnification.

Description

Optical system, lens module and electronic equipment
Technical Field
The present application relates to the field of camera technologies, and in particular, to an optical system, a lens module, and an electronic device.
Background
With the popularization development of intelligent electronic devices in recent years, in daily life, consumers often carry on a trip due to portability of the intelligent electronic devices, such as mobile phones, and consumers increasingly use the intelligent electronic devices to take pictures no matter travel or market consumption, but as requirements of consumers on photographing performance of the intelligent electronic devices are increasingly improved, a tele lens also becomes more and more, but due to the limitation of thickness of the intelligent electronic devices, the volume of a lens module on the intelligent electronic devices is gradually compressed, imaging quality of the lens is reduced along with the compression of the size, and focal length of the lens is also reduced along with the compression of the intelligent electronic devices, so that the requirements of consumers on high magnification cannot be met.
Disclosure of Invention
The application provides an optical system, a lens module and electronic equipment, which can enable a lens to have a longer focal length so as to meet the requirement of consumers on high magnification.
The technical scheme is as follows:
a first aspect of the present application provides an optical system comprising: the optical system comprises a first free-form surface prism and a second free-form surface prism, wherein the first free-form surface prism and the second free-form surface prism share a first curved surface, the first free-form surface prism is configured to reflect object light twice and then transmit the object light to the second free-form surface prism through the first curved surface, and the second free-form surface prism is configured to reflect the object light transmitted from the first curved surface once.
By adopting the scheme, the first free-form surface prism and the second free-form surface prism share one curved surface, namely the first curved surface is shared, so that the first free-form surface prism and the second free-form surface prism can be conveniently assembled, the assembly precision is improved, the imaging quality is ensured, and the reflection of the first free-form surface prism and the second free-form surface prism is matched at the same time, so that the focal length of an optical system is increased, and the requirement on high magnification is met.
In some implementations, the first freeform prism further includes a third freeform surface and a fourth freeform surface;
the third free-form surface is used for enabling the object light to be transmitted to the fourth free-form surface;
the fourth free-form surface is used for reflecting the object light to the third free-form surface;
the third free-form surface is further configured to reflect the object light reflected by the fourth free-form surface to the first curved surface.
By adopting the scheme, the first free-form surface prism at least comprises a first free-form surface, a third free-form surface and a fourth free-form surface, so that the optical axis of the optical system can be folded twice, namely object light is reflected 2 times in the first free-form surface prism, and the focal length of the optical system is increased.
In some implementations, the first curved surface is provided with an anti-reflection film, the third free-form surface is provided with an anti-reflection film, and the fourth free-form surface is provided with a reflection film.
By adopting the scheme, the antireflection film is arranged on the first curved surface so as to increase the light incoming quantity, thereby being beneficial to increasing the imaging quality; and the fourth free-form surface is provided with a reflective film to reflect the object light so as to increase the focal length of the optical system.
In some implementations, the optical system further includes a third freeform prism sharing a second curved surface with the second freeform prism; the third freeform prism is configured to transmit object light transmitted from the second curved surface that is reflected by the second freeform prism.
By adopting the scheme, the third free-form surface prism and the second free-form surface prism share the second curved surface, so that the assembly precision can be ensured, and the imaging quality can be improved.
In some implementations, the second freeform prism further includes a fifth freeform surface for reflecting the object light transmitted from the first surface to the second surface.
By adopting the scheme, the reflection of the object light can be realized by utilizing the fifth free-form surface, so that the focal length of the optical system can be increased.
In some implementations, the second curved surface is provided with an anti-reflection film and the fifth free-form surface is provided with a reflection film.
By adopting the scheme, the antireflection film is arranged on the second curved surface so as to increase the light incoming quantity, thereby being beneficial to increasing the imaging quality, and the fifth free curved surface is provided with the reflection film so as to reflect the object light, thereby being convenient for increasing the focal length of the optical system.
In some implementations, the third freeform prism further includes a sixth freeform surface for receiving object light transmitted from the second curved surface.
By adopting the scheme, the sixth free-form surface is arranged so as to be beneficial to the emission of object light.
In some implementations, the sixth free-form surface is provided with an anti-reflection film.
By adopting the scheme, the antireflection film is arranged on the sixth curved surface so as to increase the light incoming quantity, thereby being beneficial to increasing the imaging quality.
In some implementations, the optical system further includes a first lens configured to transmit the object light to the first freeform prism.
By adopting the scheme, the first lens and the first free-form surface prism are combined, so that the aberration is reduced, and the imaging quality is improved.
In some implementations, the first lens has an optical power greater than 0.
By adopting the scheme, the first lens with the focal power larger than 0 is selected, so that the imaging quality is improved.
In some implementations, the first lens is a rotationally symmetric lens.
By adopting the scheme, the rotationally symmetrical lens is beneficial to ensuring that external object light uniformly enters the optical system.
In some implementations, the first freeform prism and the second freeform prism are connected by a gluing process.
By adopting the scheme, the assembly precision between the first free-form surface prism and the second free-form surface prism can be ensured, thereby being beneficial to improving the imaging quality.
In some implementations, the second freeform prism and the third freeform prism are connected by a gluing process.
By adopting the scheme, the assembly precision between the second free-form surface prism and the third free-form surface prism can be ensured, thereby being beneficial to improving the imaging quality.
The second aspect of the present application provides a lens module, which includes: an image sensor for capturing the object light projected onto a surface of the image sensor, and an optical system of any one of the above.
By adopting the scheme, the lens module is beneficial to providing a longer focal length, thereby meeting the requirement of high magnification.
In some implementations, the image sensor is located on an incident side of the optical system, wherein the incident side of the optical system is an entrance side of the object light.
By adopting the scheme, the requirements of different application occasions can be met.
The third aspect of the application provides an electronic device, which comprises the lens module.
By adopting the scheme, the electronic equipment is favorable for providing a longer focal length, thereby meeting the requirement of high magnification.
Drawings
FIG. 1 is a schematic diagram of the structural principle of an optical system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a lens module according to an embodiment of the present application;
fig. 3 is a schematic diagram of still another structure of a lens module according to an embodiment of the present application;
FIG. 4 is a schematic diagram of an electronic device in an embodiment of the application;
FIG. 5 is a schematic diagram of the structure of a further view of an electronic device in an embodiment of the application;
FIG. 6 is a graph of MTF resolution in an embodiment of the present application;
fig. 7 is a schematic diagram of distortion in an embodiment of the present application.
Wherein, the meanings represented by the reference numerals are respectively as follows:
100. a lens module; 101. a first freeform prism; 102. a second freeform prism; 103. a first curved surface; 104. a third free-form surface; 105. a fourth free-form surface; 106. a third freeform prism; 107. a second curved surface; 108. a fifth free-form surface; 109. a sixth free-form surface; 110. a first lens; 111. a seventh surface; 112. an eighth surface; 201. an image sensor; 202. an incident side; 301. a display screen; 302. a housing.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
It should be understood that references to "a plurality" in this disclosure refer to two or more. In the description of the present application, "/" means or, unless otherwise indicated, for example, A/B may represent A or B; "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, in order to facilitate the clear description of the technical solution of the present application, the words "first", "second", etc. are used to distinguish the same item or similar items having substantially the same function and function. It will be appreciated by those of skill in the art that the words "first," "second," and the like do not limit the amount and order of execution, and that the words "first," "second," and the like do not necessarily differ.
Because of the limitation of the thickness of the intelligent electronic device, such as a mobile phone, the volume of the lens module on the intelligent electronic device is gradually compressed, the imaging quality of the lens is reduced along with the compression of the size, and the focal length of the lens is reduced along with the compression, which cannot meet the requirement of a user on high magnification. Therefore, the embodiment of the application provides an optical system, a lens module 100 and an electronic device to solve the above problems; the optical system, the lens module 100 and the electronic device according to the embodiments of the present application are explained in detail below.
Referring to fig. 1, in one or more embodiments, the optical system provided by the present application may be applied to an electronic device having a lens module 100, such as a mobile phone, a tablet computer, a notebook, or an electronic reader. The optical system includes a first freeform prism 101 and a second freeform prism 102, the first freeform prism 101 and the second freeform prism 102 sharing a first curved surface 103, the first freeform prism 101 being configured to reflect object light twice and then transmit the object light through the first curved surface 103 into the second freeform prism 102, the second freeform prism 102 being configured to reflect the object light transmitted from the first curved surface 103 once.
In the optical system in at least one embodiment of the present application, the first freeform prism 101 and the second freeform prism 102 share one curved surface, that is, share the first curved surface 103, that is, the first freeform prism 101 and the second freeform prism 102 both include the first curved surface 103, so that the assembly between the first freeform prism 101 and the second freeform prism 102 is facilitated, and the assembly space between the first freeform prism 101 and the second freeform prism 102 is not provided, so that the space occupation is reduced, the assembly of the whole optical system is facilitated, the assembly precision is facilitated, the imaging quality is ensured, and the reflection of the first freeform prism 101 and the second freeform prism 102 is matched to increase the focal length of the optical system, so as to meet the requirement of high magnification.
In some embodiments, the first curved surface 103 is a free-form curved surface, which may have more degrees of freedom in order to provide more performance to the optical system. A free-form surface may be geometrically defined as a surface that is not rotationally symmetric or translated about an optical axis, the free-form surface having more degrees of freedom than a spherical or aspherical surface. The object light is light emitted from an object outside the optical system, and the object may be a subject to be photographed.
Referring to fig. 1, in some embodiments, the first freeform prism 101 further includes a third freeform surface 104 and a fourth freeform surface 105; the third free-form surface 104 is for transmitting object light to the fourth free-form surface 105; the fourth free-form surface 105 is for reflecting the object light to the third free-form surface 104; the third free-form surface 104 is also used to reflect object light reflected by the fourth free-form surface 105 to the first curved surface 103. The specific optical path of the object light in the first freeform prism 101 is: after the object light is transmitted into the first freeform prism 101 through the third freeform surface 104, the object light reaches the fourth freeform surface 105, then is reflected by the fourth freeform surface 105, and is reflected to the third freeform surface 104, then is totally reflected by the third freeform surface 104, and is reflected to the first curved surface 103, and the object light is transmitted into the second freeform surface prism 102 through the first curved surface 103, so that the first freeform surface prism 101 at least comprises the first curved surface 103, the third freeform surface 104 and the fourth freeform surface 105, and the first freeform surface prism 101 has 3 off-axis freeform surfaces, so that the optical axis of the optical system can be folded twice in the first freeform surface prism 101, namely, the object light is reflected 2 times in the first freeform surface prism 101, and the focal length of the optical system is increased.
In some embodiments, the first curved surface 103 is provided with an anti-reflection film, the third free-form surface 104 is provided with an anti-reflection film, and the fourth free-form surface 105 is provided with a reflective film. The antireflection film is also called an antireflection film, and has the main functions of reducing or eliminating reflected light of optical surfaces such as lenses, prisms, plane mirrors and the like, so that the light transmission quantity of the element is increased, and stray light of a system is reduced or eliminated, so that the antireflection film is arranged on the first curved surface 103 and the third free curved surface 104 to increase the light input quantity, thereby being beneficial to increasing the imaging quality; and a reflective film is provided to reflect the object light so as to increase the focal length of the optical system. In one embodiment, the first curved surface 103 and the third free-form surface 104 may be provided with an antireflection film by a plating process, and the fourth free-form surface 105 may be provided with a reflection film by a plating process.
Referring to fig. 1, in some embodiments, the optical system further includes a third freeform prism 106, the third freeform prism 106 sharing a second curved surface 107 with the second freeform prism 102; the third freeform prism 106 is configured to transmit the object light transmitted from the second curved surface 107 and reflected by the second freeform prism 102. Because the third freeform prism 106 and the second freeform prism 102 share the second curved surface 107, the third freeform prism 106 and the second freeform prism 102 can be assembled without a space therebetween, thereby facilitating the assembly of the optical system, ensuring the assembly precision and being beneficial to improving the imaging quality. In some embodiments, the second curved surface 107 is a free-form curved surface, which may have more degrees of freedom in order to provide more performance to the optical system.
Referring to fig. 1, in some embodiments, the second freeform prism 102 further includes a fifth freeform surface 108, where the fifth freeform surface 108 is configured to reflect the object light transmitted from the first curved surface 103 to the second curved surface 107, so that the reflection of the object light may be implemented by the fifth freeform surface 108, thereby facilitating an increase in a focal length of the optical system. In one embodiment, the second freeform prism 102 includes at least a first curved surface 103, a fifth freeform surface 108, and a second curved surface 107, such that the second freeform prism 102 has 3 off-axis freeform surfaces, such that the specific transmission path of the object light in the second freeform prism 102 is: after the object light is emitted from the first freeform prism 101, the object light is transmitted to the second freeform prism 102 through the first curved surface 103, reflected through the fifth freeform surface 108, and transmitted into the third freeform prism 106 through the second curved surface 107, so that the optical axis of the optical system is folded once in the second freeform prism 102, namely, the object light is reflected 1 time in the second freeform prism 102, and meanwhile, the optical axis of the optical system is folded three times under the cooperation of the first freeform prism 101 and the second freeform prism 102, namely, the object light is reflected three times, thereby being beneficial to increasing the focal length of the optical system.
In some embodiments, the second curved surface 107 is provided with an anti-reflection film, which can increase the amount of light entering, thereby facilitating an increase in the quality of imaging; the fifth free-form surface 108 is provided with a reflective film so as to reflect the object light so as to increase the focal length of the optical system. In one embodiment, the second curved surface 107 may be provided with an anti-reflection film through a coating process, and the fifth free-form surface 108 may be provided with a reflection film through a coating process.
Referring to fig. 1, in some embodiments, the third freeform prism 106 further includes a sixth freeform surface 109, where the sixth freeform surface 109 is configured to receive the object light transmitted from the second curved surface 107, such that the third freeform prism 106 includes at least the second curved surface 107 and the sixth freeform surface 109, and after the object light is reflected once in the second freeform prism 102, the object light enters the third freeform prism 106 and exits the third freeform prism 106, so that the object light exits the optical system.
In some embodiments, the sixth free-form surface 109 is provided with an antireflection film, so as to increase the amount of light entering, thereby facilitating an increase in the quality of imaging; in one embodiment, the antireflection film on the sixth free-form surface 109 may be formed by a plating process.
Referring to fig. 1, in some embodiments, the optical system further includes a first lens 110, where the first lens 110 is configured to transmit the object light to the first freeform prism 101, so that combining the first lens 110 with the first freeform prism 101 is beneficial for reducing aberration and improving imaging quality.
In some embodiments, the first lens 110 has an optical power greater than 0, such that selecting the first lens 110 having an optical power greater than 0 is beneficial for improving imaging quality.
In some embodiments, the first lens 110 is a rotationally symmetric lens, which is advantageous in ensuring that external object light is incident uniformly on the optical system. In one embodiment, the first lens 110 includes a seventh surface 111 and an eighth surface 112, the seventh surface 111 and the eighth surface 112 are rotationally symmetrical surfaces, and the object light is transmitted through the first lens 110, then emitted from the eighth surface 112, and transmitted into the first freeform prism 101 through the third freeform surface 104; the first lens 110 is illustratively a plano-convex lens, which is utilized to effect the conversion of light into parallel light. It should be noted that, in the present application, the first lens 110 is not limited to a plano-convex lens, but may be a convex lens of another form, or may be formed by combining a plurality of lenses.
In some embodiments, the first freeform prism 101 and the second freeform prism 102 are connected by a gluing process, so that assembly accuracy between the first freeform prism 101 and the second freeform prism 102 can be ensured, thereby being beneficial to improving imaging quality.
In some embodiments, the second freeform prism 102 and the third freeform prism 106 are connected by a gluing process, so that assembly accuracy between the second freeform prism 102 and the third freeform prism 106 can be ensured, thereby being beneficial to improving imaging quality. Because the first freeform prism 101 is connected with the second freeform prism 102, and the second freeform prism 102 is connected with the third freeform prism 106, the first freeform prism 101, the second freeform prism 102 and the third freeform prism 106 form a free-form prism group, and the three are integrated through a gluing process, so that the assembly is facilitated, and the lens is convenient to combine with other lenses, so that the focal length of an optical system is increased. The gluing process refers to a process of adhering two or more lenses such as lenses, prisms, plane mirrors and the like to optical surfaces which are matched with each other into optical components by using an optical adhesive or a photo adhesive method according to certain technical requirements; the gluing method mainly comprises two methods: the adhesive method is to glue a plurality of optical lenses into a complex optical component by using optical transparent adhesive; the optical cement method combines a plurality of lenses into a complex optical lens group by means of the attractive force of molecules between polished surfaces of parts, and the free-form surface prism group is integrated by a gluing process, so that the assembly is convenient, the assembly precision is high, and the actual requirement is met.
It should be noted that, in some possible other ways, the number of the free-form surface prism groups in the optical system may be one or more, and since the optical path is reversible, the plurality of free-form surface prism groups may be combined, so as to further increase the focal length of the optical system.
Referring to fig. 1, in some embodiments, the first lens 110 is located on one side of the first freeform prism 101, and the eighth surface 112 of the first lens 110 is opposite to the third freeform surface 104, and when the incident light enters along the optical axis of the first lens 110, the direction of the outgoing light transmitted from the third freeform prism 106 is opposite to the direction of the incident light, but the incident light is parallel to the outgoing light.
In some embodiments, the materials of the first freeform prism 101, the second freeform prism 102 and the third freeform prism 106 may be glass or optical plastics; the first lens 110 may be glass or optical plastic. The optical plastic may be polymethyl methacrylate (PMMA), polystyrene (PS) or Polycarbonate (PC), for example, although other plastics are also possible.
As shown in conjunction with fig. 2 and 3, where the paths of light rays in the lens module are shown in fig. 2 and 3, in one or more embodiments, the present application further provides a lens module 100, which includes: the image sensor 201 and the optical system in any embodiment, the image sensor 201 is used to capture the object light projected onto the surface of the image sensor 201, so that the lens module 100 can provide a longer focal length after the optical system is applied to the lens module 100, thereby meeting the requirement of high magnification. In addition, the lens module 100 may be used to take video and/or photographs, and may be used to take scenes at different distances, for example, the lens module 100 may be used to take scenes at a distance, may be used to take scenes at a near distance, and may be used to take scenes at a distance.
In some embodiments, the image sensor 201 is located on the incident side 202 of the optical system, where the incident side 202 of the optical system is the incident side of the object light, so that the object to be photographed and the image sensor 201 are both located on the same side as the incident side 202 of the optical system, so that the requirements of different applications can be met, and when the lens module 100 is applied to an electronic device, the layout of internal components in the electronic device can be better implemented. The image sensor 201 is a semiconductor chip, the surface of which contains several hundred thousand to several million photodiodes, and when irradiated with light, charges are generated and converted into digital signals by an analog-to-digital converter chip. The image sensor 201 may be a Charge Coupled Device (CCD) or a complementary metal oxide conductor device (CMOS). The charge coupling device is made of a semiconductor material with high sensitivity, can convert light into electric charge, and can be converted into a digital signal through an analog-to-digital converter chip; CCDs are composed of a number of photosensitive units, typically in megapixels. When the CCD surface is irradiated by light, each photosensitive unit reflects charges on the component, and signals generated by all the photosensitive units are added together to form a complete picture. CMOS is mainly made of two elements, silicon and germanium, so that N (band-to-electric) and P (band + electric) level semiconductors coexist in CMOS, and the currents generated by the complementary effects can be recorded and interpreted as images by a processing chip. When the lens module 100 is used for shooting, object light enters the lens module 100, sequentially passes through a seventh surface 111 and an eighth surface 112 of the first lens 110, is transmitted into the first free-form surface prism 101 through the third free-form surface 104, is reflected to the third free-form surface 104 through the fourth free-form surface 105, is reflected again to the first curved surface 103 through the third free-form surface 104, is transmitted into the second free-form surface prism 102 through the first curved surface 103, is reflected to the second curved surface 107 after being reflected once through the fifth free-form surface 108, is transmitted into the third free-form surface prism 106 through the second curved surface 107, is transmitted out through the sixth free-form surface 109, and is projected onto the image sensor 201 so as to be captured by the image sensor 201; compared with some periscope type tele modules with the image height of approximately 5mm, the lens module 100 in the embodiment of the application can enable the imaging height to be more than 7mm after adopting a novel optical system; in addition, since the incident light is parallel to the outgoing light, the image plane formed on the image sensor 201 is perpendicular to the incident light entering along the optical axis of the first lens 110, thereby facilitating the implementation of Auto Focus (AF) of the lens module 100.
It should be noted that, in some other possible embodiments, the lens module 100 may further include a bracket, where the image sensor 201 and the optical system are fixed on the bracket, so that the image sensor 201 and the optical system form a unitary structure, thereby facilitating the installation of the image sensor and the optical system as modular components in different electronic devices.
The MTF (Modulation Transfer Function ) solution curve of the lens module 100 in the embodiment of the present application is shown in fig. 6, where the abscissa is: spatial Frequency in cycles per mm represents the spatial frequency of line pairs per millimeter (lp/mm) and the ordinate represents the MTF value. The higher the curve, the better the imaging quality; ordinate: modulus of the OTF the OTF is fully referred to as: optical Transfer Function, optical transfer function; the ordinate is here: the optical modulation transfer function, i.e. MTF. As can be seen from FIG. 6, the lens module in the embodiment of the application exhibits a better contrast ratio in a certain spatial frequency, which can indicate that the overall resolution level is higher. As can be seen from fig. 7, the distortion of the image plane is smaller, i.e. the distortion degree is smaller, after the lens module in the embodiment of the application is adopted.
In summary, the lens module 100 in the embodiment of the present application may replace a conventional periscopic tele module in an electronic device, so as to provide a larger aperture, and improve the photographing experience of a tele of a terminal user; compared with some periscope type tele modules with aperture values in the range of 3.0-4.5, the lens module 100 in the embodiment of the application adopts an off-axis optical system to replace the traditional periscope type tele module, and can form high-definition image quality for objects with the image height of 7mm under the condition that the aperture value is 2.4, so as to provide a larger aperture and a larger image surface; when the lens module 100 is applied to an electronic device, it can also improve the light incoming amount and the image quality of the electronic device, and bring better photographing experience to the user.
In one or more embodiments, the present application also provides an electronic device including the lens module 100 of any of the embodiments. The electronic device may have a longer focal length to meet the need for high magnification. The electronic device may be a device with camera or photographing functionality, such as a cellular phone, a mobile phone, a smart phone, a tablet computer, a laptop, a video camera, a video recorder, a camera, a smart watch, a smart bracelet or other forms of device with camera or photographing functionality. The embodiment of the application does not limit the specific form of the electronic device. For convenience of explanation and understanding, the electronic device is taken as an example of a mobile phone.
As shown in connection with fig. 4 and 5, in some embodiments, the electronic device further includes a display 301 and a housing 302. The housing 302 has an installation space in which the display screen 301 and the lens module 100 are installed in the housing 302. The display screen 301 may be a liquid crystal display screen 301, an organic light emitting diode display screen 301, etc., wherein the OLED display screen 301 may be a flexible screen or a rigid screen. It should be noted that, in some other possible embodiments, the electronic device may further include a protection lens for protecting the lens module 100; the protective lens is mounted on the housing 302. The side of the display 301, which is commonly referred to as an electronic device, is the front of the electronic device, and the opposite side of the electronic device is the back of the electronic device; the lens module 100 may be mounted on the front of the electronic device, so as to capture an image on the front of the electronic device; the device can also be arranged on the back of the electronic equipment and used for shooting scenes positioned on the back of the electronic equipment; of course, the lens module 100 provided in the embodiment of the application may be installed on both the front and back sides of the electronic device. It should be understood that the mounting position of the lens module 100 in the embodiment of the present application is merely illustrative, and the specific mounting position is not particularly limited.
In the description of the present application, a particular feature, structure, material, or characteristic may be combined in any one or more embodiments or examples in a suitable manner.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims (16)

1. An optical system, comprising:
a first freeform prism; and
a second free-form surface prism, the first free-form surface prism and the second free-form surface prism sharing a first curved surface, the first free-form surface prism being configured to reflect object light twice and then transmit the object light through the first curved surface into the second free-form surface prism, the second free-form surface prism being configured to reflect the object light transmitted from the first curved surface once.
2. The optical system of claim 1, wherein the first freeform prism further comprises a third freeform surface and a fourth freeform surface;
the third free-form surface is used for enabling the object light to be transmitted to the fourth free-form surface;
the fourth free-form surface is used for reflecting the object light to the third free-form surface;
the third free-form surface is further configured to reflect the object light reflected by the fourth free-form surface to the first curved surface.
3. The optical system of claim 2, wherein the first curved surface is provided with an antireflection film, the third free-form surface is provided with an antireflection film, and the fourth free-form surface is provided with a reflection film.
4. The optical system of any of claims 1-3, further comprising a third freeform prism sharing a second curved surface with the second freeform prism; the third freeform prism is configured to transmit object light transmitted from the second curved surface that is reflected by the second freeform prism.
5. The optical system of claim 4, wherein the second freeform prism further includes a fifth freeform surface for reflecting the object light transmitted from the first curved surface to the second curved surface.
6. The optical system of claim 5, wherein the second curved surface is provided with an antireflection film and the fifth free-form surface is provided with a reflection film.
7. The optical system of claim 4, wherein the third freeform prism further includes a sixth freeform surface for receiving object light transmitted from the second curved surface.
8. The optical system of claim 7, wherein the sixth free-form surface is provided with an antireflection film.
9. The optical system of any of claims 1-3, further comprising a first lens configured to transmit the object light to the first freeform prism.
10. The optical system of claim 9, wherein the first lens has an optical power greater than 0.
11. The optical system of claim 9, wherein the first lens is a rotationally symmetric lens.
12. An optical system as claimed in any one of claims 1 to 3, wherein the first freeform prism and the second freeform prism are connected by a gluing process.
13. The optical system of claim 4, wherein the second freeform prism is coupled to the third freeform prism by a gluing process.
14. A lens module, comprising: an image sensor for capturing the object light projected onto a surface of the image sensor and an optical system according to any one of claims 1-13.
15. The lens module as recited in claim 14, wherein the image sensor is located on an incident side of the optical system, wherein the incident side of the optical system is an entrance side of the object light.
16. An electronic device comprising a lens module as claimed in claim 14 or 15.
CN202211696306.6A 2022-12-28 2022-12-28 Optical system, lens module and electronic equipment Pending CN116661115A (en)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211696306.6A CN116661115A (en) 2022-12-28 2022-12-28 Optical system, lens module and electronic equipment

Publications (1)

Publication Number Publication Date
CN116661115A true CN116661115A (en) 2023-08-29

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CN202211696306.6A Pending CN116661115A (en) 2022-12-28 2022-12-28 Optical system, lens module and electronic equipment

Country Status (1)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114450614A (en) * 2019-09-27 2022-05-06 苹果公司 Free form folded optical system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114450614A (en) * 2019-09-27 2022-05-06 苹果公司 Free form folded optical system

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