Method and device for adjusting focal length of optical machine lens and electronic equipment

Abstract

The invention relates to an optical machine lens focal length adjusting method and device and electronic equipment, and the method comprises the steps: obtaining a current working temperature value of an optical machine, a pre-stored working temperature value, and a corresponding relation of a focal length value of an optical machine lens; determining a target focal length value of the ray machine lens according to a corresponding relation among the current working temperature value, the pre-stored working temperature value and the focal length value of the ray machine lens; and according to the target focal length value of the ray machine lens, controlling a ray machine lens focusing mechanism to drive the ray machine lens to move, so that the focal length value of the ray machine lens is adjusted to the target focal length value.

Description

Technical Field

[0001] The present disclosure relates to optical display technology, and more specifically, to a method and device for adjusting the focal length of an optical machine lens, and an electronic device. Background Art

[0002] In recent years, with the development of augmented reality (AR) technology, AR devices have gradually met people's pursuit of visual experience.

[0003] The optical machine is an important projection display component in AR devices. The AR optical machine is usually composed of an imaging chip and an imaging lens, and the imaging chip and the imaging lens are connected by structural parts. In order to achieve miniaturization and lightweight, the materials of the components in the AR optical machine are usually plastic materials, such as plastic lenses and plastic lens barrels. Plastic materials usually have a large thermal expansion coefficient, which causes plastic lenses and plastic lens barrels to expand and be stressed due to increased temperature. For example, the surface shape of the plastic lens itself will change as the temperature increases. The deformation of the plastic lens barrel due to heat will cause a slight change in the position of the lens. This will affect the resolution of the displayed image, and then affect the clarity of the displayed image. Therefore, existing AR devices can usually only be used in an environment of about ±20 degrees Celsius. When this temperature range is exceeded, the optical performance of the optical machine will be affected, resulting in unclear imaging of the AR device.

[0004] Therefore, it is necessary to provide a technical solution to enable optical mechanical equipment to adapt to a wide range of high and low temperature temperature environments. Summary of the invention

[0005] An object of the present invention is to provide a new technical solution for a method for adjusting the focal length of an optical machine lens.

[0006] According to a first aspect of the present invention, a method for adjusting the focal length of an optical machine lens is provided, comprising:

[0007] Obtaining the correspondence between the current operating temperature value of the optical machine, the pre-stored operating temperature value and the focal length value of the optical machine lens;

[0008] Determining a target focal length value of the optical mechanical lens according to a correspondence between the current operating temperature value, the pre-stored operating temperature value, and the focal length value of the optical mechanical lens;

[0009] According to the target focal length value of the optical mechanical lens, the optical mechanical lens focusing mechanism is controlled to drive the optical mechanical lens to move, so that the focal length value of the optical mechanical lens is adjusted to the target focal length value.

[0010] Optionally, the correspondence between the pre-stored operating temperature value and the focal length value of the optical machine lens is a linear relationship.

[0011] Optionally, the correspondence between the pre-stored operating temperature value and the focal length value of the optical mechanical lens is represented by a mapping table, wherein determining the target focal length value of the optical mechanical lens according to the correspondence between the current operating temperature value, the pre-stored operating temperature value and the focal length value of the optical mechanical lens comprises:

[0012] According to the current operating temperature value and the mapping table, the target focal length value of the optical machine lens is found; or,

[0013] The correspondence between the pre-stored working temperature value and the focal length value of the optical mechanical lens is expressed as a linear relationship, wherein determining the target focal length value of the optical mechanical lens according to the correspondence between the current working temperature value, the pre-stored working temperature value and the focal length value of the optical mechanical lens comprises:

[0014] The target focal length value of the optical machine lens is calculated according to the current operating temperature value and the linear relationship.

[0015] Optionally, the method further includes:

[0016] Obtaining an optical modulation function curve of the optical mechanical lens at different operating temperatures;

[0017] Determining the focal length value of the optomechanical lens at different working temperatures according to the optical modulation function curve of the optomechanical lens at different working temperatures;

[0018] According to the focal length values ​​of the optical machine lens at different operating temperatures, a correspondence between the pre-stored operating temperature value and the focal length value of the optical machine lens is established.

[0019] Optionally, the correspondence between the pre-stored operating temperature value and the focal length value of the optical-mechanical lens is a correspondence between the pre-stored operating temperature value and the back focus value of the optical-mechanical lens.

[0020] Optionally, it further comprises an inner lens barrel and an outer lens barrel, wherein the optical machine lens is fixed in the inner lens barrel, and the inner lens barrel is sleeved in the outer lens barrel;

[0021] The lens focusing mechanism comprises a motor, a gear, a gear ring and a focusing member, wherein the inner barrel is provided with a first mounting hole, the first mounting hole is used to fix the focusing member, the outer barrel is provided with an oblique groove, the gear ring is provided with a guide groove, the focusing member passes through the oblique groove and the guide groove,

[0022] The outer lens barrel is mounted in the gear ring, the gear and the gear ring are meshed, and the motor is used to drive the gear to rotate, thereby driving the gear ring to rotate, and then driving the focusing member to rotate synchronously and drive the focusing member to move along the oblique groove, so that the inner lens barrel produces radial rotation and movement along the optical axis.

[0023] Optionally, the lens focusing mechanism further includes a fixing plate, the fixing plate is provided with a second mounting hole, the second mounting hole is used to fix the outer lens barrel, and the motor is fixed on the fixing plate.

[0024] According to a second aspect of the present invention, there is provided a device for adjusting the focal length of an optical machine lens, comprising:

[0025] An acquisition module is used to acquire the correspondence between the current operating temperature value of the optical machine, the pre-stored operating temperature value and the focal length value of the optical machine lens;

[0026] A target focal length value determination module, used to determine the target focal length value of the optical mechanical lens according to the correspondence between the current operating temperature value, the pre-stored operating temperature value and the focal length value of the optical mechanical lens;

[0027] The control module is used to control the focusing mechanism of the optical mechanical lens to drive the optical mechanical lens to move according to the target focal length value of the optical mechanical lens, so as to adjust the focal length value of the optical mechanical lens to the target focal length value.

[0028] According to a third aspect of the present invention, there is provided a device for adjusting the focal length of an optical machine lens, comprising a memory and a processor, wherein the memory stores a computer program, and the computer program is used to control the processor to operate to execute the method according to any one of the first aspects.

[0029] According to a fourth aspect of the present invention, there is provided an electronic device, comprising an optical machine, an optical machine lens focusing mechanism, and an optical machine lens focal length adjustment device as described in the second aspect or the third aspect.

[0030] The method for adjusting the focal length of an optical machine lens provided by the present invention obtains the correspondence between the current working temperature value of the optical machine, the pre-stored working temperature value and the focal length value of the optical machine lens, determines the target focal length value of the optical machine lens according to the correspondence between the current working temperature value, the pre-stored working temperature value and the focal length value of the optical machine lens, and controls the focusing mechanism of the optical machine lens to drive the optical machine lens to move according to the target focal length value of the optical machine lens, so that the focal length value of the optical machine lens is adjusted to the target focal length value, thereby achieving that the focal length value of the optical machine lens can be adjusted in real time according to the current working temperature value of the optical machine, so that the projection display effect of the optical machine is always kept in an optimal state, and the optical machine can adapt to a wider temperature range. Within this wider temperature range, the projection display effect of the optical machine is always kept in an optimal state, thereby improving the performance of the optical machine.

[0031] Features and advantages of the embodiments of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the embodiments of the specification.

[0033] Figure 1 It is a flowchart of a method for adjusting the focal length of an optical machine lens according to an embodiment of the present invention.

[0034] Figure 2a FIG. 4 is a schematic diagram of a modulation transfer function curve at -30° C. according to an embodiment of the present invention.

[0035] Figure 2b FIG. 4 is a schematic diagram of a modulation transfer function curve at -20° C. according to an embodiment of the present invention.

[0036] Figure 2c FIG. 4 is a schematic diagram of a modulation transfer function curve at -10° C. according to an embodiment of the present invention.

[0037] Figure 2d FIG. 4 is a schematic diagram of a modulation transfer function curve at 0° C. according to an embodiment of the present invention.

[0038] Figure 2e FIG. 4 is a schematic diagram of a modulation transfer function curve at 10° C. according to an embodiment of the present invention.

[0039] Figure 2f FIG. 4 is a schematic diagram of a modulation transfer function curve at 20° C. according to an embodiment of the present invention.

[0040] Figure 2g FIG. 4 is a schematic diagram of a modulation transfer function curve at 30° C. according to an embodiment of the present invention.

[0041] Figure 2h FIG. 4 is a schematic diagram of a modulation transfer function curve at 40° C. according to an embodiment of the present invention.

[0042] Figure 2i FIG. 4 is a schematic diagram of a modulation transfer function curve at 50° C. according to an embodiment of the present invention.

[0043] Figure 2j FIG. 4 is a schematic diagram of a modulation transfer function curve at 60° C. according to an embodiment of the present invention.

[0044] Figure 2k FIG. 4 is a schematic diagram of a modulation transfer function curve at 70° C. according to an embodiment of the present invention.

[0045] Figure 3 4 is a graph showing a corresponding relationship between an operating temperature value and a back focus value of an optical machine lens according to an embodiment of the present invention.

[0046] Figure 4is a cross-sectional view of an optical machine and a lens focusing mechanism according to an embodiment of the present invention.

[0047] Figure 5 It is a schematic structural diagram of an optical machine and a lens focusing mechanism according to an embodiment of the present invention.

[0048] Figure 6 1 is a schematic diagram of an exploded view of an optical machine and a lens focusing mechanism according to an embodiment of the present invention.

[0049] Figure 7 The present invention is a block diagram of a device for adjusting the focal length of an optical machine lens according to an embodiment of the present invention.

[0050] Figure 8 It is a structural block diagram of a device for adjusting the focal length of an optical machine lens according to an embodiment of the present invention. DETAILED DESCRIPTION

[0051] Various exemplary embodiments of the present specification will now be described in detail with reference to the accompanying drawings.

[0052] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the embodiments of the present specification and its application or uses.

[0053] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0054] In one embodiment of the present invention, a method for adjusting the focal length of an optical machine lens is provided. Figure 1 As shown, the method for adjusting the focal length of the optical machine lens of this embodiment includes the following steps S110 to S130.

[0055] Step S110, obtaining the correspondence between the current operating temperature value of the optical engine, the pre-stored operating temperature value and the focal length value of the optical engine lens.

[0056] In some embodiments, a temperature sensor is provided in the optical machine. The temperature sensor is used to collect the current operating temperature value of the optical machine. The current operating temperature value of the optical machine is related to the ambient temperature of the optical machine on the one hand, and to the luminous brightness of the light source of the optical machine on the other hand. The higher the ambient temperature of the optical machine, the higher the current operating temperature value of the optical machine. The higher the luminous brightness of the light source of the optical machine, the more heat is generated, so that the current operating temperature value of the optical machine is higher.

[0057] The focal length value of the optical machine lens corresponding to each working temperature value is the focal length value that enables the optical machine to have the best projection display effect at the corresponding working temperature value.

[0058] In some embodiments, the correspondence between the pre-stored operating temperature value and the focal length value of the optical-mechanical lens may be a correspondence between the pre-stored operating temperature value and the back focal value of the optical-mechanical lens.

[0059] In some embodiments, the correspondence between the pre-stored operating temperature value and the focal length value of the optical mechanical lens is a linear relationship. In the case where the correspondence between the pre-stored operating temperature value and the focal length value of the optical mechanical lens is the correspondence between the pre-stored operating temperature value and the back focus value of the optical mechanical lens, the correspondence between the pre-stored operating temperature value and the back focus value of the optical mechanical lens is a linear relationship.

[0060] In some embodiments, the method also includes: obtaining an optical modulation function curve of the optical machine lens at different operating temperatures; determining the focal length value of the optical machine lens at different operating temperatures based on the optical modulation function curve of the optical machine lens at different operating temperatures; and establishing a correspondence between a pre-stored operating temperature value and the focal length value of the optical machine lens based on the focal length value of the optical machine lens at different operating temperatures.

[0061] The Optical Transfer Function (OTF) is a function used to evaluate image quality in an optical imaging system. It uses spatial frequency as a variable to characterize the relative changes in modulation and lateral phase shift during the imaging process. The Optical Transfer Function consists of the Modulation Transfer Function (MTF) and the Phase Transfer Function (PTF). Among them, MTF can be used to represent the characteristics of an optical system. The larger the MTF, the better the imaging quality of the optical system.

[0062] Figure 2a-2k They are respectively modulation transfer function curves at different temperatures according to an embodiment of the present invention. Figure 2a-2k The different temperatures involved are -30℃, -20℃, -10℃, 0℃, 10℃, 20℃, 30℃, 40℃, 50℃, 60℃, and 70℃.

[0063] by Figure 2a The modulation transfer function curve corresponding to -30°C is shown as an example for explanation, the horizontal axis represents the back focus value, and the vertical axis represents the modulation transfer function value. Figure 2aAs shown, the modulation transfer function curve corresponding to -30°C includes multiple curves, each of which is a modulation transfer function curve under a different field of view. First, determine the maximum ordinate value of each curve, and then determine a maximum value from the maximum ordinate values ​​of each curve. The abscissa value corresponding to the maximum value is the back focus value corresponding to -30°C. It should be noted that based on each curve, the larger the ordinate value, the better the imaging quality of the optical system, that is, when the focal length of the optical machine lens is the focal length value corresponding to the maximum value determined from the maximum ordinate value of each curve, the imaging quality of the optical machine is in the best state at the corresponding temperature.

[0064] based on Figure 2a-2k The modulation transfer function curves at different temperatures shown can obtain the back focus values ​​corresponding to -30℃, -20℃, -10℃, 0℃, 10℃, 20℃, 30℃, 40℃, 50℃, 60℃, and 70℃, see Table 1 for details.

[0065] According to Table 1 above, we can get the corresponding relationship between the working temperature value and the back focus value of the optical machine lens. For details, see Figure 3 .according to Figure 3 As shown, the corresponding relationship between the working temperature value and the back focus value of the optical machine lens is a linear relationship.

[0066] Table 1

[0067]

[0068]

[0069] Step S120, determining the target focal length value of the optical machine lens according to the correspondence between the current working temperature value, the pre-stored working temperature value and the focal length value of the optical machine lens.

[0070] In some embodiments, the correspondence between the pre-stored working temperature value and the focal length value of the optical machine lens is represented by a mapping table. Step S120 specifically searches for the target focal length value of the optical machine lens according to the current working temperature value and the mapping table;

[0071] For example, the correspondence between the pre-stored working temperature value and the focal length value of the optical machine lens is a mapping table, similar to Table 1. The back focal values ​​of the optical machine lens corresponding to different working temperature values ​​are recorded in the mapping table. Using the current working temperature value, the target focal length value of the optical machine lens is found from the correspondence between the pre-stored working temperature value and the back focal value of the optical machine lens.

[0072] In some embodiments, the correspondence between the pre-stored working temperature value and the focal length value of the optical mechanical lens is expressed as a linear relationship. Step S120 specifically calculates the target focal length value of the optical mechanical lens according to the current working temperature value and the linear relationship.

[0073] For example, the relationship between the pre-stored working temperature value and the focal length value of the optical machine lens is a linear relationship, that is, t=kf+b, t is the working temperature value, f is the back focus value, k and b are known coefficients. According to the current working temperature value and the above linear relationship, the back focus value corresponding to the current working temperature value is calculated.

[0074] Step S130, according to the target focal length value of the optical mechanical lens, controlling the optical mechanical lens focusing mechanism to drive the optical mechanical lens to move, so that the focal length value of the optical mechanical lens is adjusted to the target focal length value.

[0075] In some embodiments, according to Figure 4 As shown, the optical machine lens assembly includes an optical machine lens 411, an inner lens barrel 412, and an outer lens barrel 413. The optical machine lens 411 is fixed in the inner lens barrel 412. The inner lens barrel 412 is sleeved in the outer lens barrel 413. Figure 4 As shown, the lens focusing mechanism 420 includes a motor 421, a gear 422, a gear ring 423 and a focusing member 424. The inner lens barrel 412 is provided with a first mounting hole 412a. The first mounting hole 412a is used to fix the focusing member 424. Figure 5 As shown, the outer lens barrel 413 is provided with an oblique groove 413a. The gear ring 423 is provided with a guide groove 423a. The focus member 424 passes through the oblique groove 413a and the guide groove 423a. The outer lens barrel 413 is sleeved in the gear ring 423. The gear 422 and the gear ring 423 are meshed. The motor 421 is used to drive the gear 422 to rotate, so as to drive the gear ring 423 to rotate, and then drive the focus member 424 to rotate synchronously and drive the focus member 424 to move along the oblique groove 413a, so that the inner lens barrel 412 generates radial rotation and movement along the optical axis direction.

[0076] It should be noted that Figure 5 The schematic diagram of the structure of the optical machine and the lens focusing mechanism is shown. Figure 4 is based on Figure 5 Obtained cross-sectional view.

[0077] The lens focusing mechanism provided by the embodiment of the present invention drives the gear ring to rotate by controlling the motor to drive the gear ring to rotate. Since the focusing member passes through the guide groove provided on the gear ring, the focusing member rotates synchronously. Since the focusing member also passes through the oblique groove provided on the outer lens barrel, the focusing member slides in the oblique groove. The synchronous rotation of the focusing member can drive the inner lens barrel to rotate radially, and the sliding of the focusing member in the oblique groove can drive the inner lens barrel to move along the optical axis, thereby adjusting the distance between the optical machine lens fixed in the inner lens barrel and the display source in the optical machine, and realizing the precise adjustment of the focal length of the optical machine lens.

[0078] according to Figure 5 As shown, the oblique groove 413 a forms a certain angle with the axial direction of the outer lens barrel 413 .

[0079] In some embodiments, the focusing member is tangent to the groove wall of the oblique groove, so as to prevent the focusing member from shaking when sliding in the oblique groove.

[0080] according to Figure 5 As shown, the guide groove 423 a is opened along the axial direction of the gear ring 423 . Figure 5 The length of the guide groove 423a shown can be set according to needs.

[0081] according to Figure 5 As shown, the focusing member 424 is a pin. In some embodiments, the first mounting hole 412a is a threaded hole, and the focusing member 424 is a screw.

[0082] In some embodiments, the focusing member is tangent to the groove wall of the guide groove, so as to prevent the focusing member from shaking when sliding in the guide groove.

[0083] In some embodiments, according to Figure 4 As shown, the lens focusing mechanism 420 also includes a fixing plate 425. The fixing plate 425 is provided with a second mounting hole 425a. The second mounting hole 425a is used to fix the outer lens barrel 413. The motor 421 is fixed on the fixing plate 425. Figure 4 As shown, when the motor drives the gear to rotate to drive the gear ring to rotate, the outer lens barrel does not rotate.

[0084] Figure 4 The display source 430 of the optical machine is also shown. The display source 430 and the optical machine lens 411 are arranged at intervals along the optical axis direction.

[0085] It should be noted that Figure 4 The number and surface shape of the optical machine lenses shown are merely examples and do not impose any limitation on the present invention.

[0086] The method for adjusting the focal length of an optical machine lens provided by the present invention obtains the correspondence between the current working temperature value of the optical machine, the pre-stored working temperature value and the focal length value of the optical machine lens, determines the target focal length value of the optical machine lens according to the correspondence between the current working temperature value, the pre-stored working temperature value and the focal length value of the optical machine lens, and controls the focusing mechanism of the optical machine lens to drive the optical machine lens to move according to the target focal length value of the optical machine lens, so that the focal length value of the optical machine lens is adjusted to the target focal length value, thereby achieving that the focal length value of the optical machine lens can be adjusted in real time according to the current working temperature value of the optical machine, so that the projection display effect of the optical machine is always kept in an optimal state, and the optical machine can adapt to a wider temperature range. Within this wider temperature range, the projection display effect of the optical machine is always kept in an optimal state, thereby improving the performance of the optical machine.

[0087] An embodiment of the present invention provides a device for adjusting the focal length of an optical machine lens. Figure 7 As shown, the device 700 for adjusting the focal length of an optical machine lens includes an acquisition module 710 , a target focal length value determination module 720 and a control module 730 .

[0088] The acquisition module 710 is used to acquire the correspondence between the current operating temperature value of the optical machine, the pre-stored operating temperature value and the focal length value of the optical machine lens.

[0089] The target focal length value determination module 720 is used to determine the target focal length value of the optical machine lens according to the correspondence between the current working temperature value, the pre-stored working temperature value and the focal length value of the optical machine lens.

[0090] The control module 730 is used to control the focusing mechanism of the optical mechanical lens to drive the optical mechanical lens to move according to the target focal length value of the optical mechanical lens, so as to adjust the focal length value of the optical mechanical lens to the target focal length value.

[0091] In some embodiments, the correspondence between the pre-stored working temperature value and the focal length value of the optical machine lens is the correspondence between the pre-stored working temperature value and the back focus value of the optical machine lens.

[0092] In some embodiments, the correspondence between the pre-stored operating temperature value and the focal length value of the optical machine lens is a linear relationship.

[0093] In some embodiments, the correspondence between the pre-stored operating temperature value and the focal length value of the optical mechanical lens is represented by a mapping table. The target focal length value determination module 720 is used to find the target focal length value of the optical mechanical lens according to the current operating temperature value and the mapping table.

[0094] In some embodiments, the correspondence between the pre-stored operating temperature value and the focal length value of the optical machine lens is expressed as a linear relationship. The target focal length value determination module 720 is used to calculate the target focal length value of the optical machine lens according to the current operating temperature value and the linear relationship.

[0095] In some embodiments, the device for adjusting the focal length of the optical mechanical lens further includes a corresponding relationship determination module. The corresponding relationship determination module is used to obtain the optical modulation function curve of the optical mechanical lens at different working temperatures; determine the focal length value of the optical mechanical lens at different working temperatures according to the optical modulation function curve of the optical mechanical lens at different working temperatures; and establish a corresponding relationship between the pre-stored working temperature value and the focal length value of the optical mechanical lens according to the focal length value of the optical mechanical lens at different working temperatures.

[0096] An embodiment of the present invention provides a device for adjusting the focal length of an optical machine lens. Figure 8As shown, the device 800 for adjusting the focal length of an optical machine lens includes a memory 820 and a processor 810. The memory 820 stores a computer program, and the computer program is used to control the processor 810 to operate to execute the method provided according to any of the above embodiments.

[0097] An embodiment of the present invention provides an electronic device, which includes an optical machine, an optical machine lens focusing mechanism, and an optical machine lens focal length adjustment device as provided in any of the above embodiments.

[0098] The electronic device may be any one of a VR (Virtual Reality) device, an AR (Augmented Reality) device, and a DLP (Digital Light Procession) device.

[0099] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0100] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0101] The embodiments of the present specification may be systems, methods and / or computer program products. The computer program product may include a computer-readable storage medium carrying computer instructions for causing a processor to implement various aspects of the embodiments of the present specification.

[0102] A computer-readable storage medium may be a tangible device that can hold and store computer instructions used by a computer instruction execution device. A computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples of computer-readable storage media (a non-exhaustive list) include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which computer instructions are stored, and any suitable combination of the foregoing. As used herein, a computer-readable storage medium is not to be interpreted as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through a wire.

[0103] The computer instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer instructions from the network and forwards the computer instructions for storage in the computer-readable storage medium in each computing / processing device.

[0104] The flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the systems, methods and computer program products according to the multiple embodiments of this specification. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a computer instruction, and a part of a module, a program segment or a computer instruction contains one or more executable computer instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or the flowchart, and the combination of the boxes in the block diagram and / or the flowchart can be implemented by a dedicated hardware-based system that performs the specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions. It is well known to those skilled in the art that it is equivalent to implement it by hardware, implement it by software, and implement it by combining software and hardware.

[0105] The embodiments of the present specification have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A method for adjusting the focal length of an optical machine lens, characterized in that: include: Obtaining the correspondence between the current operating temperature value of the optical machine, the pre-stored operating temperature value and the focal length value of the optical machine lens; Determining a target focal length value of the optical mechanical lens according to a correspondence between the current operating temperature value, the pre-stored operating temperature value, and the focal length value of the optical mechanical lens; According to the target focal length value of the optical mechanical lens, the optical mechanical lens focusing mechanism is controlled to drive the optical mechanical lens to move, so that the focal length value of the optical mechanical lens is adjusted to the target focal length value.

2. The method according to claim 1, characterized in that The correspondence between the pre-stored working temperature value and the focal length value of the optical machine lens is a linear relationship.

3. The method according to claim 1, characterized in that The correspondence between the pre-stored operating temperature value and the focal length value of the optical mechanical lens is represented by a mapping table, wherein determining the target focal length value of the optical mechanical lens according to the correspondence between the current operating temperature value, the pre-stored operating temperature value and the focal length value of the optical mechanical lens comprises: According to the current operating temperature value and the mapping table, the target focal length value of the optical machine lens is found; or, The correspondence between the pre-stored working temperature value and the focal length value of the optical mechanical lens is expressed as a linear relationship, wherein determining the target focal length value of the optical mechanical lens according to the correspondence between the current working temperature value, the pre-stored working temperature value and the focal length value of the optical mechanical lens comprises: The target focal length value of the optical machine lens is calculated according to the current operating temperature value and the linear relationship.

4. The method according to claim 1, characterized in that: The method further comprises: Obtaining an optical modulation function curve of the optical mechanical lens at different operating temperatures; Determining the focal length value of the optomechanical lens at different working temperatures according to the optical modulation function curve of the optomechanical lens at different working temperatures; According to the focal length values ​​of the optical machine lens at different operating temperatures, a correspondence between the pre-stored operating temperature value and the focal length value of the optical machine lens is established.

5. The method according to claim 1, characterized in that The correspondence between the pre-stored working temperature value and the focal length value of the optical machine lens is the correspondence between the pre-stored working temperature value and the back focus value of the optical machine lens.

6. The method according to any one of claims 1 to 5, characterized in that: It also includes an inner lens barrel and an outer lens barrel, wherein the optical machine lens is fixed in the inner lens barrel, and the inner lens barrel is sleeved in the outer lens barrel; The lens focusing mechanism comprises a motor, a gear, a gear ring and a focusing member, wherein the inner barrel is provided with a first mounting hole, the first mounting hole is used to fix the focusing member, the outer barrel is provided with an oblique groove, the gear ring is provided with a guide groove, the focusing member passes through the oblique groove and the guide groove, The outer lens barrel is mounted in the gear ring, the gear and the gear ring are meshed, and the motor is used to drive the gear to rotate, thereby driving the gear ring to rotate, and then driving the focusing member to rotate synchronously and drive the focusing member to move along the oblique groove, so that the inner lens barrel produces radial rotation and movement along the optical axis.

7. The method according to claim 6, characterized in that The lens focusing mechanism also includes a fixing plate, the fixing plate is provided with a second mounting hole, the second mounting hole is used to fix the outer lens barrel, and the motor is fixed on the fixing plate.

8. A device for adjusting the focal length of an optical machine lens, characterized in that: include: An acquisition module is used to acquire the correspondence between the current operating temperature value of the optical machine, the pre-stored operating temperature value and the focal length value of the optical machine lens; A target focal length value determination module, used to determine the target focal length value of the optical mechanical lens according to the correspondence between the current operating temperature value, the pre-stored operating temperature value and the focal length value of the optical mechanical lens; The control module is used to control the focusing mechanism of the optical mechanical lens to drive the optical mechanical lens to move according to the target focal length value of the optical mechanical lens, so as to adjust the focal length value of the optical mechanical lens to the target focal length value.

9. A device for adjusting the focal length of an optical machine lens, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program, and the computer program is used to control the processor to operate so as to execute the method according to any one of claims 1 to 7.

10. An electronic device, characterized in that: It comprises an optical machine, an optical machine lens focusing mechanism and an optical machine lens focal length adjustment device as described in claim 8 or 9.

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