Focusing mechanism, focusing control method, focusing control device and electronic equipment

Abstract

The invention relates to a focusing mechanism, a focusing control method, a focusing control device and electronic equipment, and the focusing mechanism comprises a controller, an inner lens cone, an outer lens cone, a motor, a turbine, a worm, a rheostat, and a focusing part. Wherein the inner lens cone is sleeved in the outer lens cone, the outer lens cone is provided with a moving groove, the turbine is fixed on the inner lens cone, the rheostat comprises a gear, and the controller is used for controlling the motor to drive the worm to rotate so as to drive the turbine to generate radial rotation in the moving groove. When the focusing piece rotates, the gear is driven to rotate, so that the resistance value of the rheostat changes, the inner lens cone is driven to rotate in the radial direction, the focusing piece drives the inner lens cone to move in the axial direction, and synchronous change of the focal length value and the resistance value is achieved. The controller is further used for determining a current focal length value according to the current resistance value of the rheostat.

Description

Technical Field

[0001] The present disclosure relates to a focusing technology, and more specifically, to a focusing mechanism, a focusing control method, a focusing control device and an electronic device. Background Art

[0002] In the context of today's rapid technological development, autofocus technology has become an indispensable functional module for high-end electronic devices. This technology requires electronic devices to be able to sense the focus position of the lens in real time, accurately drive the motor to adjust the lens to the ideal focus state, and ensure that the picture always remains clear.

[0003] Existing autofocus technology generally uses optical coupling sensors in conjunction with mechanical baffles to achieve focusing. Optical coupling sensors are set at the starting and ending points of the lens focusing stroke. By monitoring the signal changes generated by the baffle blocking the optical coupling sensor, it is determined whether the lens has reached the focusing boundary, that is, the starting point or the end point. This focusing technology requires reverse or forward pushing from the known focusing boundary to the target focal length. This process can produce a "virtual step" effect of the motor, that is, there is a time delay and step error between the motor receiving the command and the actual start of transmission. This phenomenon varies in different motors and working environments, which seriously affects the focusing accuracy. In addition, in order to improve the focusing accuracy, existing autofocus technology usually adopts a gear transmission system with a high reduction ratio, which will also aggravate the above-mentioned "virtual step" problem, and will also introduce additional mechanical noise, resulting in a poor user experience.

[0004] Therefore, it is necessary to provide a focusing technology to improve the focusing accuracy and enhance the user experience. Summary of the invention

[0005] An object of the present invention is to provide a new technical solution for a focusing mechanism.

[0006] According to a first aspect of the present invention, a focusing mechanism is provided, comprising: a controller, an inner lens barrel, an outer lens barrel, a motor, a turbine, a worm, a rheostat and a focusing member; wherein:

[0007] The inner lens barrel is sleeved in the outer lens barrel, the outer lens barrel is provided with a moving groove, the turbine is fixed on the inner lens barrel, and the rheostat includes a gear.

[0008] The controller is used to control the motor to drive the worm to rotate, so as to drive the turbine to rotate radially in the moving groove, thereby driving the gear to rotate, so that the resistance value of the variable resistor changes, and drives the inner lens barrel to rotate radially, and then drives the inner lens barrel to move axially through the focusing member, so as to achieve synchronous changes in focal length value and resistance value.

[0009] The controller is also used to determine a current focal length value according to a current resistance value of the variable resistor.

[0010] Optionally, the focusing member is fixed on the inner lens barrel, and the outer lens barrel is provided with an oblique groove.

[0011] The inner lens barrel generates radial rotation, drives the focusing member to slide in the inclined groove, and further drives the inner lens barrel to generate axial movement.

[0012] Optionally, the focusing member is tangent to the groove wall of the inclined groove.

[0013] Optionally, the focusing member is the inner lens barrel and the outer lens barrel, and the outer wall of the inner lens barrel and the inner wall of the outer lens barrel are both provided with threads, wherein:

[0014] When the inner lens barrel rotates radially, the inner lens barrel is driven to move axially through the threaded connection.

[0015] Optionally, the focusing mechanism further includes a detection circuit, and the controller pre-stores a correspondence between a focal length value and a voltage value, wherein:

[0016] The detection circuit is used to convert the resistance value of the variable resistor into a voltage value and send the voltage value to the controller.

[0017] The controller is used to determine the current focal length value according to the voltage value sent by the detection circuit and the corresponding relationship.

[0018] According to a second aspect of the present invention, there is provided a focus control method, which is applied to the focus mechanism as described in the first aspect, and the method comprises:

[0019] Obtaining a first current focal length value and a target focal length value;

[0020] When the first current focal length value and the target focal length value are inconsistent, controlling the motor to drive the worm to rotate, so as to drive the turbine and the gear to rotate, and drive the inner lens barrel to generate radial rotation and axial movement, so that the focal length value and the resistance value change synchronously;

[0021] determining a second current focal length value according to a current resistance value of the variable resistor;

[0022] In a case where the second current focal length value is the same as the target focal length value, it is determined that the focusing operation is completed.

[0023] Optionally, before obtaining the target focal length value, the method further includes:

[0024] Get the current projection distance value and the correspondence between the pre-stored projection distance value and the focal length value;

[0025] The target focal length value is determined according to the corresponding relationship among the current projection distance value, the pre-stored projection distance value and the focal length value.

[0026] Optionally, controlling the motor to drive the worm to rotate includes:

[0027] When the first current focal length value is greater than the target focal length value, the motor is controlled to drive the worm to rotate in a first direction, and, when the first current focal length value is less than the target focal length value, the motor is controlled to drive the worm to rotate in a second direction, the first direction and the second direction being opposite directions.

[0028] According to a third aspect of the present invention, there is provided a focus control device, 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 focus control method according to any one of the second aspect of the present invention.

[0029] According to a fourth aspect of the present invention, there is provided an electronic device comprising the focusing mechanism as described in any one of the first aspects of the present invention.

[0030] The focusing mechanism provided by the present invention can accurately reflect the real-time focal length value of the lens through a rheostat. In addition, a worm gear transmission is adopted in the transmission mechanism. This transmission mode has high efficiency, large reduction ratio and self-locking characteristics, can effectively reduce the idling and return errors in the motor driving process, and greatly reduces the "virtual step" phenomenon. At the same time, the smooth operation characteristics of the worm gear can also significantly reduce the mechanical transmission noise, so that the focusing process of the entire focusing mechanism is quieter and smoother. After the focusing is completed, its self-locking characteristics also avoid the change of clarity caused by shaking, and finally more accurate automatic focusing can be achieved, thereby improving the user experience.

[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 2 is a schematic structural diagram of a focusing mechanism according to an embodiment of the present invention.

[0034] Figure 2 1 is a partial structural diagram of a focusing mechanism according to an embodiment of the present invention.

[0035] Figure 31 is a partial structural diagram of a focusing mechanism according to an embodiment of the present invention.

[0036] Figure 4 1 is a partial structural diagram of a focusing mechanism according to an embodiment of the present invention.

[0037] Figure 5 is a processing flow chart of a focus control method according to an embodiment of the present invention.

[0038] Figure 6 4 is a schematic diagram of the hardware structure of a focus control device according to an embodiment of the present invention.

[0039] Figure 7 is a principle block diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0040] Various exemplary embodiments of the present specification will now be described in detail with reference to the accompanying drawings.

[0041] 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.

[0042] 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.

[0043] In one embodiment of the present invention, a focusing mechanism is provided. Figure 1 As shown, the focus adjustment mechanism includes a controller, an inner barrel 110 , an outer barrel 120 , a motor 130 , a turbine 140 , a worm 150 , a rheostat 160 and a focus adjustment member 170 . Figure 1 The controller is not shown.

[0044] according to Figure 1 As shown, the inner lens barrel 110 is sleeved in the outer lens barrel 120, the outer lens barrel 120 is provided with a moving groove 121, the turbine 140 is fixed on the inner lens barrel 110, and the rheostat 160 includes a gear 161. The worm 150 is meshed with the turbine 140, and the gear 161 is meshed with the turbine 140. The worm 150 is an active part, and the turbine 140 and the gear 161 are both driven parts.

[0045] according to Figure 1 and Figure 2 As shown, the turbine 140 is closely attached to the outer wall of the inner lens barrel 110. The length of the turbine 140 can be set according to requirements.

[0046] according to Figure 1 and Figure 3As shown, the moving groove 121 is opened along the axial direction of the outer barrel 120 . Figure 1 The length of the movable slot 121 shown can be set according to requirements.

[0047] The gear 161 is connected to a slider or a knob in the rheostat 160. The rotation of the gear 161 drives the slider to slide or the knob to rotate to change the length of the resistance line connected to the circuit, thereby changing the resistance value of the rheostat.

[0048] The controller is electrically connected to the motor 130. The controller is used to control the motor 130 to drive the worm 150 to rotate, so as to drive the turbine 140 to rotate radially in the moving groove 121, and then drive the gear 161 to rotate, so that the resistance value of the rheostat 160 changes, and drives the inner lens barrel 110 to rotate radially, and then drives the inner lens barrel 110 to move axially through the focusing member 170, so as to achieve synchronous changes in the focal length value and the resistance value.

[0049] Since the focal length value and the resistance value change synchronously, the change in the resistance value can be used to represent the change in the focal length value.

[0050] The axial movement involved here is the axial movement of the inner barrel 110 relative to the outer barrel 120 .

[0051] The mechanical matching relationship between the motor 130, the worm 150, the worm gear 140 and the gear 161 can also be specifically referred to in Figure 4 .

[0052] The controller is also electrically connected to the variable resistor 160. The controller is also used to determine the current focal length value according to the current resistance value of the variable resistor.

[0053] The focusing mechanism provided in the embodiment of the present invention can accurately reflect the real-time focal length value of the lens through a rheostat. In addition, a worm gear transmission is adopted in the transmission mechanism. This transmission mode has high efficiency, large reduction ratio and self-locking characteristics, and can effectively reduce the idling and return errors in the motor driving process, greatly reducing the "virtual step" phenomenon. At the same time, the smooth operation characteristics of the worm gear can also significantly reduce the mechanical transmission noise, making the focusing process of the entire focusing mechanism quieter and smoother. After the focusing is completed, its self-locking characteristics also avoid the change in clarity caused by shaking, and finally more accurate automatic focusing can be achieved, thereby improving the user experience.

[0054] In one embodiment, the focusing mechanism further comprises a bracket to fix the lens barrel, the motor and the rheostat. Figure 1As shown, the bracket includes a lens barrel bracket 181, a motor bracket 182 and a rheostat bracket 183. The outer lens barrel 120 is fixed on the lens barrel bracket 181, the motor 130 is fixed on the motor bracket 182, the motor bracket 182 is fixed on the lens barrel bracket 181, the rheostat 160 is fixed on the rheostat bracket 183, and the rheostat bracket 183 is fixed on the outer lens barrel 120.

[0055] In one embodiment, according to Figure 1 and Figure 2 As shown, the focusing member 170 is fixed on the inner lens barrel 110. Figure 1 and Figure 3 As shown, the outer lens barrel 120 is provided with an inclined groove 122. The inner lens barrel 110 rotates radially, driving the focusing member 170 to slide in the inclined groove 122, thereby driving the inner lens barrel 110 to move axially.

[0056] The sliding direction of the focusing member 170 in the inclined groove 122 forms an angle less than 90° with the axial rotation direction of the inner lens barrel 110 .

[0057] according to Figure 1 and Figure 2 As shown, the focusing member 170 is a screw. A threaded hole is provided at the position where the focusing member is fixed in the inner lens barrel 110 to fix the screw through threaded engagement.

[0058] It should be noted that the focusing member 170 is not limited to a screw, but can also be a rod-shaped member or a cylindrical member. When the focusing member 170 is a rod-shaped member or a cylindrical member, a hole is provided at the position where the inner lens barrel 110 fixes the focusing member to place the rod-shaped member or the cylindrical member.

[0059] In one embodiment, the focusing member 170 is tangent to the wall of the inclined groove 122 , so as to prevent the focusing member 170 from shaking during the sliding process in the inclined groove 122 .

[0060] In one embodiment, the focusing member 170 is an inner lens barrel 110 and an outer lens barrel 120. The outer wall of the inner lens barrel 110 and the inner wall of the outer lens barrel 120 are both provided with threads. When the inner lens barrel 110 rotates radially, the inner lens barrel 110 is driven to move axially by the threaded connection. The axial movement involved here is the axial movement of the inner lens barrel 110 relative to the outer lens barrel 120.

[0061] In one embodiment, the focus adjustment mechanism further includes a detection circuit, which is electrically connected to the variable resistor 160 and is also electrically connected to the controller.

[0062] The controller stores the correspondence between the focal length value and the voltage value. That is, when the lens is focusing, each focal length value corresponds to a specific voltage value.

[0063] The detection circuit is used to convert the resistance value of the variable resistor into a voltage value and send the voltage value to the controller. The controller is used to determine the current focal length value based on the voltage value and the corresponding relationship sent by the detection circuit. In this way, the resistance value can be converted into a voltage value that is easier to detect through the detection circuit, and the change in the voltage value is used to characterize the change in the focal length value. In addition, the resistance value of the variable resistor changes linearly, and the detection circuit can capture the linear change in real time and accurately, and accurately convert it into a linearly changing voltage value.

[0064] The controller is also used to compare the current focal length value with the target focal length value to obtain a comparison result. When the current focal length value is inconsistent with the target focal length value, the motor is controlled to drive the worm to rotate, so as to drive the turbine and gear to rotate, and drive the inner lens barrel to produce radial rotation and axial movement, so that the focal length value and the resistance value change synchronously, until the current focal length value is the same as the target focal length value, it is determined that the focusing operation is completed, and automatic and precise focusing is achieved.

[0065] In one embodiment of the present invention, a focus control method is provided, which is applied to the focus mechanism provided in any of the above embodiments. Figure 5 As shown, the focus control method of this embodiment may include the following steps S510 to S540.

[0066] Step S510, obtaining a first current focal length value and a target focal length value.

[0067] Step S520, when the first current focal length value and the target focal length value are inconsistent, control the motor to drive the worm to rotate, so as to drive the turbine and the gear to rotate, and drive the inner barrel to produce radial rotation and axial movement, so that the focal length value and the resistance value change synchronously.

[0068] Step S530, determining a second current focal length value according to the current resistance value of the variable resistor.

[0069] Step S540: When the second current focal length value is the same as the target focal length value, it is determined that the focusing operation is completed.

[0070] The focusing control method provided by the embodiment of the present invention, when the first current focal length value and the target focal length value are inconsistent, the driving motor drives the worm to rotate, so as to drive the turbine and the gear to rotate, and drive the inner lens barrel to generate radial rotation and axial movement, so as to achieve fast and accurate focusing.

[0071] In one embodiment, the first current focal length value can be determined according to the current resistance value. The current resistance value can be characterized by the current voltage value detected by the detection circuit. The first current focal length value is determined according to the correspondence between the pre-stored focal length value and the voltage value and the current voltage value.

[0072] In one embodiment, the focusing mechanism is suitable for focusing the lens of the projection device. Before obtaining the target focal length value, the method further includes: obtaining the current projection distance value and the correspondence between the pre-stored projection distance value and the focal length value; and determining the target focal length value according to the correspondence between the current projection distance value, the pre-stored projection distance value and the focal length value.

[0073] The current projection distance value can be measured using a distance measuring sensor of the projection device.

[0074] The corresponding relationship between the projection distance value and the focal length value is determined by pre-calibration. Each focal length value corresponds to a projection distance value.

[0075] In one embodiment, controlling the motor to drive the worm to rotate specifically includes: when the first current focal length value is greater than the target focal length value, controlling the motor to drive the worm to rotate around a first direction; and when the first current focal length value is less than the target focal length value, controlling the motor to drive the worm to rotate around a second direction, the first direction and the second direction are opposite directions.

[0076] An embodiment of the present invention provides a focus control device, such as Figure 6 The focus control device 600 includes a memory 620 and a processor 610. The memory 620 stores a computer program, and the computer program is used to control the processor 610 to operate so as to execute the focus control method in any of the above embodiments.

[0077] The focus control device is a controller in a focus mechanism.

[0078] An embodiment of the present invention provides an electronic device, such as Figure 7 As shown, it includes any focusing mechanism provided in the above embodiments.

[0079] The electronic device may be a projection device. In addition to the above-mentioned focusing mechanism, the projection device also includes a distance sensor. The distance sensor is used to determine the projection distance value and send the projection distance value to the controller.

[0080] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. For the device embodiment, its related parts can be referred to the partial description of the method embodiment.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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 through a network layer, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network layer may include copper transmission cables, optical fiber transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. The network layer adapter card or network layer interface in each computing / processing device receives the computer instructions from the network layer and forwards the computer instructions for storage in a computer-readable storage medium in each computing / processing device.

[0085] 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.

[0086] 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 focusing mechanism, characterized in that: include: Controller, inner lens barrel, outer lens barrel, motor, turbine, worm, rheostat and focusing element; among which, The inner lens barrel is sleeved in the outer lens barrel, the outer lens barrel is provided with a moving groove, the turbine is fixed on the inner lens barrel, and the rheostat includes a gear. The controller is used to control the motor to drive the worm to rotate, so as to drive the turbine to rotate radially in the moving groove, thereby driving the gear to rotate, so that the resistance value of the variable resistor changes, and drives the inner lens barrel to rotate radially, and then drives the inner lens barrel to move axially through the focusing member, so as to achieve synchronous changes in focal length value and resistance value. The controller is also used to determine a current focal length value according to a current resistance value of the variable resistor.

2. The focusing mechanism according to claim 1, characterized in that: The focusing member is fixed on the inner lens barrel, and the outer lens barrel is provided with an oblique groove. The inner lens barrel generates radial rotation, drives the focusing member to slide in the inclined groove, and further drives the inner lens barrel to generate axial movement.

3. The focusing mechanism according to claim 2, characterized in that: The focusing member is tangent to the groove wall of the inclined groove.

4. The focusing mechanism according to claim 1, characterized in that: The focusing member is the inner lens barrel and the outer lens barrel, and the outer wall of the inner lens barrel and the inner wall of the outer lens barrel are both provided with threads, wherein: When the inner lens barrel rotates radially, the inner lens barrel is driven to move axially through the threaded connection.

5. The focusing mechanism according to any one of claims 1 to 4, characterized in that: The focusing mechanism also includes a detection circuit, and the controller pre-stores a corresponding relationship between the focal length value and the voltage value, wherein: The detection circuit is used to convert the resistance value of the variable resistor into a voltage value and send the voltage value to the controller. The controller is used to determine the current focal length value according to the voltage value sent by the detection circuit and the corresponding relationship.

6. A focusing control method, characterized in that: Applied to the focusing mechanism according to any one of claims 1 to 5, the method comprises: Obtaining a first current focal length value and a target focal length value; When the first current focal length value and the target focal length value are inconsistent, controlling the motor to drive the worm to rotate, so as to drive the turbine and the gear to rotate, and drive the inner lens barrel to generate radial rotation and axial movement, so that the focal length value and the resistance value change synchronously; determining a second current focal length value according to a current resistance value of the variable resistor; In a case where the second current focal length value is the same as the target focal length value, it is determined that the focusing operation is completed.

7. The method according to claim 6, characterized in that Before obtaining the target focal length value, the method further includes: Get the current projection distance value and the correspondence between the pre-stored projection distance value and the focal length value; The target focal length value is determined according to the corresponding relationship among the current projection distance value, the pre-stored projection distance value and the focal length value.

8. The method according to claim 6 or 7, characterized in that: The controlling the motor to drive the worm to rotate comprises: When the first current focal length value is greater than the target focal length value, the motor is controlled to drive the worm to rotate in a first direction, and, when the first current focal length value is less than the target focal length value, the motor is controlled to drive the worm to rotate in a second direction, the first direction and the second direction being opposite directions.

9. A focus control device, 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 6 to 8.

10. An electronic device, characterized in that: It comprises a focusing mechanism as described in any one of claims 1-5.

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