CN116560072B - Method and device for controlling optical scanning focal plane based on liquid lens - Google Patents
Method and device for controlling optical scanning focal plane based on liquid lens Download PDFInfo
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- CN116560072B CN116560072B CN202310828169.5A CN202310828169A CN116560072B CN 116560072 B CN116560072 B CN 116560072B CN 202310828169 A CN202310828169 A CN 202310828169A CN 116560072 B CN116560072 B CN 116560072B
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- 239000007788 liquid Substances 0.000 title claims abstract description 114
- 230000003287 optical effect Effects 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000003384 imaging method Methods 0.000 claims abstract description 26
- 239000011521 glass Substances 0.000 claims description 9
- 238000003825 pressing Methods 0.000 claims description 8
- 238000013461 design Methods 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 238000004590 computer program Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims 1
- 230000017525 heat dissipation Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 230000003313 weakening effect Effects 0.000 abstract description 2
- 239000010408 film Substances 0.000 description 11
- 239000002609 medium Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 239000012120 mounting media Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/12—Scanning systems using multifaceted mirrors
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/12—Fluid-filled or evacuated lenses
- G02B3/14—Fluid-filled or evacuated lenses of variable focal length
Abstract
The invention provides a method and a device for controlling an optical scanning focal plane based on a liquid lens, wherein the method comprises the following steps: according to the field curve of the scanning optical system, the lens in front of the rotary scanning plane reflector is designed as a liquid lens, the shape of the liquid lens is changed according to the rotation position of the rotary scanning plane reflector, and the focal length of the lens is changed according to the field curve of the scanning optical system by changing the shape of the liquid lens, so that the optical scanning is focused into a plane in space. According to the invention, by designing the liquid lens, the focal length of the liquid lens is changed according to the field curvature curve of the scanning optical system, so that the effect of scanning the optical scanning focusing imaging surface into a plane is achieved, and the problems of light weakening and heating caused by the fact that the traditional rotating scanning plane reflector optical system imaging surface is solved, and the existing f-theta lenses are adopted for correcting the field curvature are solved; and the laser emission can be prevented from being reflected back to the laser gun, so that the laser gun is protected from damage.
Description
Technical Field
The invention relates to the technical field of one-dimensional laser scanning, in particular to a method and a device for controlling an optical scanning focal plane based on a liquid lens.
Background
Most of the conventional rotating mirrors are plane mirrors, and in order to solve the problem that the imaging surface of the optical scanning system is curved (see fig. 1), an f-theta lens is usually required to be added between the rotating scanning plane mirror and the imaging surface, which results in complex design and difficult implementation of the optical system (see fig. 3).
Furthermore, each time the light passes through one of the f-theta lenses, the light is partially absorbed to cause light loss, and the temperature of the lens increases due to the absorption of the energy of the light. If the energy of the light is high, the temperature may be too high, causing the lens to burn out.
In practical applications, the problem of heat generation can be solved, but if the angle position of the incident laser beam of the reflected light of the turning mirror is poor, the laser beam may be reflected back to the laser gun again to cause damage to the laser gun, as shown in fig. 4, if the trapezoid turning mirror is a known rectangular turning mirror, the laser beam may be reflected back to the laser gun under certain conditions. In order to avoid the above situation, the installation position of the laser gun is greatly limited, which causes great limitation to the installation and use of the whole optical scanning system.
Therefore, there is a need to design a light scanning system assembly that avoids the reflection of laser light back into the laser gun to reduce the use limitations of the optical scanning system.
Disclosure of Invention
In view of this, the present invention aims to design the lens in front of the rotating scanning plane mirror (simply referred to as "turning mirror") as a liquid lens according to the field curvature of the scanning optical system, so that the shape of the liquid lens changes according to the position of the rotating scanning plane mirror, and thus the focal length of the lens can be changed according to the field curvature of the scanning optical system, so as to achieve the purpose of scanning on the focusing imaging plane to form a straight line, and the optical scanning focus is focused into a plane in space, so as to solve the field curvature problem; and by modifying the lens pattern, damage caused by reflection of laser light back to the laser gun is avoided.
The invention provides a method for controlling an optical scanning focal plane based on a liquid lens, which comprises the following steps:
the lens in front of the rotary scanning plane reflector is designed as a liquid lens, the shape of the liquid lens is changed according to the rotation position of the rotary scanning plane reflector, and the shape of the liquid lens is changed to change the focal length of the lens according to the field curvature curve of the scanning optical system, so that the lens can scan on a focusing imaging surface to form a straight line, and the optical scanning focus is formed into a straight line in space.
Further, the method for changing the focal length of the lens according to the field curvature of the scanning optical system by changing the shape of the liquid lens includes:
the lens focal length F is made to conform to the relation:
（1）
in the formula (1), M, H and L are set design parameters and are known values; l is the vertical distance between the rotation center of the rotary scanning plane reflector and the center of the liquid lens, H is the vertical distance between the rotation center of the rotary lens and the scanning focusing surface, M is the horizontal distance between the laser leaving the mirror surface of the liquid lens and the intersection point a of the rotary lens reflecting surface, and P is the horizontal distance between the laser leaving the mirror surface of the liquid lens and the laser projection focusing surface.
Further, the calculation solution expression of the lens focal length F includes:
（2）
（3）
in the formulas (2) and (3), the angle θ is an angle at which the rotary polygon mirror rotates from a horizontal angle of 0 ° to an angle at which an apex of the end face is as high as H.
Further, the computational solution expression of M is:
（4）
（5）
in the formulas (4) and (5), R is half of the width of the end face opposite to the edge of the rotary polygon mirror, θ 1 For vertical line segments from the axis o of the rotating polygon mirror to the reflecting surface of the rotating mirrorLine segment connecting with rotation axis o of rotary polygon mirror to intersection point a of reflecting surface of laser incident rotary mirrorThe angle theta is the angle formed by rotating the rotary polygon mirror from the horizontal angle 0 DEG to the rotation angle of the vertex of the angle of the end face and the height H, and N is the horizontal distance from the mirror surface of the liquid lens to the rotating shaft of the rotary mirror.
Further, the method for scanning the focusing imaging surface into a straight line comprises the following steps:
the optical focusing imaging is performed in a straight line by adjusting the values of H, L, N to obtain the relation between M and P and theta according to the formulas (1) - (5) and calculating the focal length F of the lens according to the formula (3).
The focal length of the liquid lens can be adjusted by adopting a control program shown in fig. 10, the rotating shaft of the rotating mirror can be controlled by a decoder (decoder) to obtain the angle theta of the rotating mirror at the moment, the focal length F of the lens at the angle theta is calculated, and the focal length of the liquid lens is adjusted through F, so that the focusing surfaces are in line.
The invention also provides a device for controlling the optical scanning focal plane based on the liquid lens, which is applied to the method for controlling the optical scanning focal plane based on the liquid lens and comprises the following steps:
rotating the scanning mirror: the optical scanning focusing imaging plane is used for forming an optical scanning focusing imaging plane by reflecting incident laser through the reflecting surface;
liquid lens: the focal length of the lens is changed according to the field curvature curve of the scanning optical system by changing the shape of the liquid lens, so that the focal length F of the lens accords with the relation:
（1）
scanning on the focused imaging plane into a straight line, focusing the optical scanning into a plane in space.
Further, the liquid lens includes: the device comprises a glass base, a liquid cavity filled with liquid, a cover plate, a film, a compression ring, an actuator and an actuator spring; wherein the liquid cavity is arranged inside the glass base, and the cover plate is arranged above the glass base; the film is arranged on the outer surface of the liquid cavity and is positioned below the cover plate; the compression ring and the actuator spring are arranged above the film; the actuator is arranged above the pressing ring and used for pressing down the film to enable the film to generate a curved surface under the pressure of liquid.
Further, the liquid in the liquid cavity can enter and exit through the arranged inlet and outlet, and the liquid lens is cooled to dissipate heat, so that good heat control is achieved.
The invention also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of a method of controlling an optically scanning focal plane based on a liquid lens as described above.
The invention also provides a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, which when executed implements the steps of the method of controlling an optical scanning focal plane based on a liquid lens as described above.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the lens in front of the rotary scanning plane reflecting mirror is designed as the liquid lens, and the shape of the liquid lens is changed to change the focal length of the lens according to the field curvature curve of the scanning optical system, so that the effect of scanning the optical scanning focusing imaging surface into a plane can be achieved, the field curvature problem of the imaging surface of the traditional rotary scanning plane reflecting mirror optical system is solved, and the problems of light weakening and heating caused by adopting a plurality of f-theta lenses as correction field curvature in the prior art are solved; and the laser emission is prevented from being reflected back to the laser gun, so that the laser gun is protected from damage.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
In the drawings:
FIG. 1 is a schematic diagram of a focus plane A field curvature occurring when a f-theta lens is not used by a laser emitted by a conventional laser gun;
FIG. 2 is a schematic diagram of a computer device according to an embodiment of the present invention;
FIG. 3 is a schematic view showing a focusing plane after being reflected by a mirror reflecting surface when an incident laser beam emitted from a laser gun passes through an f-theta lens according to the prior art;
FIG. 4 is a schematic view showing the laser reflection direction after installing a liquid lens according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an optical module for controlling a light scanning focal plane based on a liquid lens according to an embodiment of the present invention;
FIG. 6 is a schematic diagram showing the components of a variable focus liquid lens according to an embodiment of the present invention;
FIG. 7 is a cross-sectional view of a liquid lens with a symmetrical convex lens formed by a thin film having a curved surface due to the liquid pressure by an actuator according to an embodiment of the present invention;
FIG. 8 is a cross-sectional view of a liquid lens with an asymmetric convex lens formed by a curved surface of a thin film due to the liquid pressure by tilting and pressing down a pressure ring by an actuator according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of the physical dimensions of the component positions of an apparatus for controlling an optically scanned focal plane based on a liquid lens according to an embodiment of the present invention; the method comprises the steps of carrying out a first treatment on the surface of the
FIG. 10 is a control program diagram of a method for controlling an optically scanned focus plane based on a liquid lens according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and products consistent with some aspects of the disclosure as detailed in the appended claims.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "at … …" or "responsive to a determination", depending on the context.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
The embodiment of the invention provides a method for controlling an optical scanning focal plane based on a liquid lens, which comprises the following steps:
the lens in front of the rotary scanning plane reflector is designed as a liquid lens, the shape of the liquid lens is changed according to the rotation position of the rotary scanning plane reflector, and the shape of the liquid lens is changed to change the focal length of the lens according to the field curvature curve of the scanning optical system, so that the lens can scan on a focusing imaging surface to form a straight line, and the optical scanning is focused to form a plane in space.
The method for changing the focal length of the lens according to the field curvature of the scanning optical system by changing the shape of the liquid lens comprises the following steps:
the lens focal length F is made to conform to the relation:
（1）
in the formula (1), M, H and L are set design parameters and are known values; l is the vertical distance between the rotation center of the rotary scanning plane reflector and the center of the liquid lens, H is the vertical distance between the rotation center of the rotary lens and the scanning focusing surface, M is the horizontal distance between the laser leaving the mirror surface of the liquid lens and the intersection point a of the rotary lens reflecting surface, and P is the horizontal distance between the laser leaving the mirror surface of the liquid lens and the laser projection focusing surface.
The computational solution expression of the lens focal length F comprises:
（2）
（3）
in the formulas (2) and (3), the angle θ is an angle at which the rotary polygon mirror rotates from a horizontal angle of 0 ° to an angle at which an apex of the end face is as high as H.
The computational solution expression of M is as follows:
（4）
（5）
in the formulas (4) and (5), R is half of the width of the opposite side of the end face of the rotary polygon mirror, the angle theta is the angle from 0 DEG horizontal rotation of the rotary polygon mirror to the rotation of the same height as H in the vertex of the angle of the end face, and N is the horizontal distance from the mirror surface of the liquid lens to the rotating shaft of the rotary mirror.
Referring to FIG. 9, R isThe angle θ is the vertical line +.o of the turning mirror from the axis of rotation to the reflecting surface>Angle θ from horizontal to the state of fig. 9 1 Is->And->Is included in the bearing.
The method for scanning the focusing imaging surface into a straight line comprises the following steps:
the optical focusing imaging is performed in a straight line by adjusting the values of H, L, N to obtain the relation between M and P and theta according to the formulas (1) - (5) and calculating the focal length F of the lens according to the formula (3).
The focal length of the liquid lens can be adjusted by adopting a control program shown in fig. 10, the rotating shaft of the rotating mirror can be controlled by a decoder (decoder) to obtain the angle theta of the rotating mirror at the moment, the focal length F of the lens at the angle theta is calculated, and the focal length of the liquid lens is adjusted through F, so that the focusing surfaces are in line.
In this embodiment, as shown in fig. 5, the laser emitted from the laser gun passes through the variable-focus liquid lens and then is reflected to the focusing surface by the turning mirror, and the turning mirror passes through the controlled variable-focus liquid lens at different angles, so that the focusing surface is a plane.
The embodiment of the invention also provides a device for controlling the optical scanning focal plane based on the liquid lens, which is applied to the method for controlling the optical scanning focal plane based on the liquid lens and comprises the following steps:
rotating the scanning mirror: the optical scanning focusing imaging plane is used for forming an optical scanning focusing imaging plane by reflecting incident laser through the reflecting surface;
liquid lens: the focal length of the lens is changed according to the field curvature curve of the scanning optical system by changing the shape of the liquid lens, so that the focal length F of the lens accords with the relation:
（1）
scanning on the focused imaging plane into a straight line, focusing the optical scanning into a plane in space.
The liquid lens includes: glass base, liquid filled liquid chamber, cover plate, membrane (not shown in fig. 6 on the liquid chamber due to being covered by the cover plate), pressure ring, actuator, and actuator spring; wherein the liquid cavity is arranged inside the glass base, and the cover plate is arranged above the glass base; the film is arranged on the outer surface of the liquid cavity and is positioned below the cover plate; the compression ring and the actuator spring are arranged above the film; the actuator is arranged above the pressing ring and used for pressing down the film to enable the film to generate a curved surface under the pressure of liquid.
Fig. 7 and 8 are cross-sectional views of the liquid lens, and referring to fig. 7, the actuator presses down the pressure ring uniformly, and the film forms a curved surface under the pressure of the liquid to form a symmetrical convex lens, so that the laser generates focusing effect. Referring to fig. 8, the actuator is used to press the pressure ring obliquely, the film forms a curved surface under the pressure of the liquid to form an asymmetric convex lens, so that the laser generates a focusing effect which is not on the optical axis, for example, the function can completely avoid the laser from being reflected back to the laser gun at any position, and the design of the whole system is more changed.
The preferred embodiment of the invention only considers the condition that the actuator uniformly presses down the pressure ring, and can enable the focusing surface to be a liquid lens focal length F obtained by a plane according to different angles of the rotating mirror, and controls the depth of the actuator uniformly pressing down the pressure ring according to the focal length F.
The liquid in the liquid cavity can enter and exit through the arranged inlet and outlet, and the liquid lens is cooled to dissipate heat, so that good heat control is achieved.
According to the embodiment of the invention, the lens in front of the rotary scanning plane reflecting mirror is designed to be the liquid lens, and the shape of the liquid lens is changed to change the focal length of the lens according to the field curvature curve of the scanning optical system, so that the effect of scanning the optical scanning focusing imaging surface into a plane can be achieved, the field curvature problem of the imaging surface of the traditional rotary scanning plane reflecting mirror optical system is solved, and the problems of light attenuation and heating caused by adopting a plurality of f-theta lenses as correction field curvature in the prior art are solved; and the laser emission is prevented from being reflected back to the laser gun, so that the laser gun is protected from damage.
The embodiment of the invention also provides a computer device, and fig. 2 is a schematic structural diagram of the computer device provided by the embodiment of the invention; referring to fig. 2 of the drawings, the computer apparatus includes: input means 23, output means 24, memory 22 and processor 21; the memory 22 is configured to store one or more programs; when executed by the one or more processors 21, cause the one or more processors 21 to implement a method of controlling an optically scanning focal plane based on a liquid lens as provided by the above embodiments; wherein the input device 23, the output device 24, the memory 22 and the processor 21 may be connected by a bus or otherwise, for example in fig. 2 by a bus connection.
The memory 22 is used as a computer readable and writable storage medium, and can be used for storing software programs and computer executable programs, and the program instructions corresponding to the method for controlling the optical scanning focusing surface based on the liquid lens according to the embodiment of the invention; the memory 22 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for functions; the storage data area may store data created according to the use of the device, etc.; in addition, memory 22 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device; in some examples, memory 22 may further comprise memory located remotely from processor 21, which may be connected to the device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input means 23 is operable to receive input numeric or character information and to generate key signal inputs relating to user settings and function control of the device; the output device 24 may include a display device such as a display screen.
The processor 21 executes various functional applications of the device and data processing, i.e. implements the above-described method of controlling the optical scanning focal plane based on a liquid lens, by running software programs, instructions and modules stored in the memory 22.
The computer device provided by the above embodiment can be used for executing the method for controlling the optical scanning focusing surface based on the liquid lens, and has corresponding functions and beneficial effects.
Embodiments of the present invention also provide a storage medium containing computer-executable instructions, which when executed by a computer processor, are for performing a method of controlling an optically scanning focal plane based on a liquid lens as provided by the above embodiments, the storage medium being any of various types of memory devices or storage devices, the storage medium comprising: mounting media such as CD-ROM, floppy disk or tape devices; computer system memory or random access memory, such as DRAM, DDRRAM, SRAM, EDORAM, rambus (Rambus) RAM, etc.; nonvolatile memory such as flash memory, magnetic media (e.g., hard disk or optical storage); registers or other similar types of memory components, etc.; the storage medium may also include other types of memory or combinations thereof; in addition, the storage medium may be located in a first computer system in which the program is executed, or may be located in a second, different computer system, the second computer system being connected to the first computer system through a network (such as the internet); the second computer system may provide program instructions to the first computer for execution. Storage media includes two or more storage media that may reside in different locations (e.g., in different computer systems connected by a network). The storage medium may store program instructions (e.g., embodied as a computer program) executable by one or more processors.
Of course, the storage medium containing computer executable instructions provided in the embodiments of the present invention is not limited to the method for controlling the optical scanning focal plane based on the liquid lens according to the above embodiments, and related operations in the method for controlling the optical scanning focal plane based on the liquid lens provided in any embodiment of the present invention may also be performed.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the invention; various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A method for controlling an optically scanned focal plane based on a liquid lens, comprising:
the lens in front of the rotary scanning plane reflector is designed into a liquid lens, the shape of the liquid lens is changed according to the rotating position of the rotary scanning plane reflector, the shape of the liquid lens is changed to change the focal length of the lens according to the field curvature curve of the scanning optical system, so that the lens can scan on a focusing imaging surface to form a straight line, and the optical scanning focus is formed into a straight line in space;
the method for changing the focal length of the lens according to the field curvature of the scanning optical system by changing the shape of the liquid lens comprises the following steps:
the lens focal length F is made to conform to the relation:
（1）
in the formula (1), M, H and L are set design parameters and are known values; l is the vertical distance between the rotation center of the rotary scanning plane reflector and the center of the liquid lens, H is the vertical distance between the rotation center of the rotary lens and the scanning focusing surface, M is the horizontal distance between the laser leaving the mirror surface of the liquid lens and the intersection point a of the rotary lens reflecting surface, and P is the horizontal distance between the laser leaving the mirror surface of the liquid lens and the laser projection focusing surface;
the computational solution expression of the lens focal length F comprises:
（2）
（3）
in the formulas (2) and (3), the angle theta is an angle formed by rotating the rotary polygon mirror from a horizontal angle of 0 DEG to an angle vertex of the end face and the height H;
the computational solution expression of M is as follows:
（4）
（5）
in the formulas (4) and (5), R is half of the width of the end face opposite to the edge of the rotary polygon mirror, θ 1 For vertical line segments from the axis o of the rotating polygon mirror to the reflecting surface of the rotating mirrorLine segment +.>The angle theta is the angle formed by rotating the rotary polygon mirror from the horizontal angle 0 DEG to the rotation angle of the vertex of the angle of the end surface and the height H, and N is the horizontal distance from the mirror surface of the liquid lens to the rotating shaft of the rotary mirror;
the method for scanning the focusing imaging surface into a straight line comprises the following steps:
the optical focal length F calculated according to the formula (3) is formed by adjusting the values of H, L, N to obtain the relation between M and P and theta angles according to the formulas (1) - (5), so that the optical focal length F is formed into a straight line.
2. An apparatus for controlling an optically scanned focal plane based on a liquid lens as recited in claim 1, wherein the method for controlling an optically scanned focal plane based on a liquid lens comprises:
rotating the scanning mirror: the optical scanning focusing imaging plane is used for forming an optical scanning focusing imaging plane by reflecting incident laser through the reflecting surface;
liquid lens: the focal length of the lens is changed according to the field curvature curve of the scanning optical system by changing the shape of the liquid lens, so that the focal length F of the lens accords with the relation:
（1）
scanning on a focusing imaging surface is in a straight line, and focusing the optical scanning focus into a plane in space.
3. The device for controlling an optically scanning focal plane based on a liquid lens of claim 2, wherein the liquid lens comprises: the device comprises a glass base, a liquid cavity filled with liquid, a cover plate, a film, a compression ring, an actuator and an actuator spring; wherein the liquid cavity is arranged inside the glass base, and the cover plate is arranged above the glass base; the film is arranged on the outer surface of the liquid cavity and is positioned below the cover plate; the compression ring and the actuator spring are arranged above the film; the actuator is arranged above the pressing ring and used for pressing down the film to enable the film to generate a curved surface under the pressure of liquid.
4. A liquid lens-based apparatus for controlling an optical scanning focal plane as recited in claim 3, wherein the liquid in the liquid chamber is capable of entering and exiting through the disposed entrance and exit, and cooling the liquid lens for heat dissipation.
5. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, carries out the steps of the method of controlling an optically scanning focal plane based on a liquid lens according to claim 1.
6. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method of controlling an optical scanning focal plane based on a liquid lens as claimed in claim 1 when the program is executed by the processor.
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