CN112782824B - Lens module control system and control method thereof - Google Patents
Lens module control system and control method thereof Download PDFInfo
- Publication number
- CN112782824B CN112782824B CN202010266703.4A CN202010266703A CN112782824B CN 112782824 B CN112782824 B CN 112782824B CN 202010266703 A CN202010266703 A CN 202010266703A CN 112782824 B CN112782824 B CN 112782824B
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- lens module
- lens
- holding
- module
- bimetal
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
- G03B13/36—Autofocus systems
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Adjustment Of Camera Lenses (AREA)
- Studio Devices (AREA)
- Lens Barrels (AREA)
Abstract
The present disclosure relates to a lens module control system and a control method thereof, wherein a lens module includes a lens module, a base for mounting the lens module, and a brake mechanism fixed on the base and capable of holding the lens module, the method comprising: acquiring position information of a lens module; controlling the brake mechanism to be electrified so as to release the lens module; controlling the lens module to act according to the position information; when the lens module reaches the target position, the brake mechanism is controlled to be de-energized to hold the lens module. When the anti-shake or focusing function is not used, the lens module can be quickly stopped by the braking mechanism after the braking mechanism is powered off, so that the system is quickly and stably realized, and abnormal sound caused by shaking or impacting of equipment is avoided. In shooting state, the braking mechanism can keep the position of the lens module, and the lens module is not required to be continuously electrified to keep the position of the lens module, so that the stability is prevented from being reduced due to the fact that the temperature of the lens module is increased.
Description
Technical Field
The disclosure relates to the field of optical technology, and in particular, to a lens module control system and a control method thereof.
Background
In recent years, with the demands of users, various technologies of shooting devices are rapidly developed, and the application of the shooting devices is not limited to cameras, for example, the shooting devices can be widely applied to cameras and projection devices of mobile phones, or can be applied to unmanned aerial vehicles for aerial photography or ranging and the like. In order to meet the application requirements in various fields, optical anti-shake technology and automatic focusing technology are added into shooting equipment. The optical anti-shake technology can control the lens to move relative to the image sensor, so that image offset caused by hand shake or external effect is counteracted, and the equipment can keep imaging stable in a shake environment. The auto-focusing technique can move the lens in the direction of the optical axis to make the shot object imaging clearest. In both technologies, the lens moves to different degrees, when the movement is stopped, a driving system is required to apply a driving force in the opposite direction to the lens, so that the movement of the lens is stopped as soon as possible, and when shooting is performed without an anti-shake or focusing function, the lens still needs to be continuously electrified to keep stable, so that the temperature of the optical system is increased, and the stability of the system is poorer along with the increase of the temperature, so that the imaging effect is affected.
Disclosure of Invention
The disclosure provides a lens module control system and a control method thereof to improve performance of a lens module.
In order to achieve the above object, the present disclosure provides a lens module control method, the lens module including a lens module, a base for mounting the lens module, and a detent mechanism fixed to the base and capable of holding the lens module, the method comprising: acquiring position information of a lens module; controlling the brake mechanism to be electrified so as to release the lens module; controlling the lens module to act according to the position information; and when the lens module reaches a target position, controlling the braking mechanism to be powered off so as to keep the lens module.
Optionally, before the lens module reaches a target position, when the lens module approaches the target position, the current through the detent mechanism is reduced to bring the detent mechanism into contact with the lens module.
Optionally, the braking mechanism includes a friction portion for contacting the lens module, the friction portion being configured to reduce a current through the braking mechanism when the lens module approaches the target position, to cause the friction portion to exert a first pressure on the lens module, and to control the braking mechanism to de-energize when the lens module reaches the target position, to cause the friction portion to exert a second pressure on the lens module that is greater than the first pressure.
The braking mechanism includes an actuating portion mounted on the base and a holding portion for holding the lens module and interlocking with the actuating portion, and the step of controlling energization of the braking mechanism to release the lens module includes: controlling the action part to be electrified so as to drive the holding part to release the lens module; the step of controlling the brake mechanism to be de-energized to clamp the lens module includes: and controlling the action part to be powered off so as to enable the holding part to return to hold the lens module.
Optionally, the actuating portion is made of a bimetal, the holding portion is connected to the bimetal, an active layer of the bimetal is disposed on a side close to the lens module, a passive layer of the bimetal is disposed on a side far from the lens module, and the step of controlling the brake mechanism to be energized to release the lens module includes: controlling the bimetallic strip to be electrified so that the bimetallic strip drives the retaining part to deflect towards one side of the passive layer; the step of controlling the brake mechanism to be de-energized to clamp the lens module includes: and controlling the bimetallic strip to be powered off, and enabling the retaining part to return to one side of the active layer by the bimetallic strip.
Optionally, the actuating portion includes an SMA wire disposed at one end of the holding portion, the SMA wire having a high temperature phase shape that stretches or contracts at a high temperature and a low temperature phase shape opposite to the high temperature phase shape at a low temperature, the step of controlling the brake mechanism to be energized to release the lens module includes: controlling the SMA wire to be electrified so as to drive the retaining part to deflect towards one side far away from the lens module through the high-temperature phase shape of the SMA wire; the step of controlling the brake mechanism to be de-energized to hold the lens module includes: and controlling the power-off of the SMA wire so as to enable the retaining part to return to one side close to the lens module through the low-temperature phase shape of the SMA wire.
Optionally, a position sensor is disposed on the base, and the step of acquiring the position information of the lens module includes: the control method includes the steps of: and judging whether the position of the lens module is different from the target position according to the position information of the lens module acquired by the position sensor.
Optionally, the lens module includes a lens, a carrier for mounting the lens, and an electromagnetic driving mechanism for driving the carrier to move, and the step of acquiring the positional information of the lens module includes: acquiring the position information of the carrier; the step of controlling the lens module to reach a target position according to the position information comprises the following steps: and controlling the electromagnetic driving mechanism to be electrified according to the position information so as to drive the carrier to reach a target position.
According to a second aspect of the present disclosure, there is also provided a lens module control system, the lens module including a lens module, a base for mounting the lens module, and a detent mechanism fixed to the base and capable of holding the lens module, the detent mechanism including a release position for releasing the lens module when energized and a holding position for holding the lens module when de-energized, the control system comprising: a receiving module configured to acquire position information of the lens module; the first control module is configured to control the brake mechanism to be electrified or powered off after the position information of the lens module is acquired; and a second control module configured to control the lens module to act according to the position information.
Optionally, a position sensor is disposed on the base, and the control system further includes: and the detection module is connected with the receiving module and is used for detecting the position of the lens module.
Through the technical scheme, the braking mechanism which is released after the lens module is electrified and kept after the power is cut off is designed, and when the anti-shake or focusing function is not used, the lens module can be quickly stopped by the braking mechanism after the braking mechanism is powered off, so that the system is quickly and stably. In shooting state, the brake mechanism can keep the lens module position unchanged, and the lens module position is kept without continuous power on, so that the stability reduction caused by the temperature rise of the lens module is avoided. In addition, under the condition that equipment is not used, the braking mechanism always keeps the lens module in a power-off state, abnormal sound generated by shaking or impacting of the equipment is avoided, user experience is influenced, the service performance of the lens module can be guaranteed, and the service life of the equipment is prolonged.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
FIG. 1 is a flowchart of a method for controlling a lens module according to an exemplary embodiment of the present disclosure;
FIG. 2 is a flowchart of a lens module control method provided in another exemplary embodiment of the present disclosure;
FIG. 3 is a block diagram of a lens module control system provided in an exemplary embodiment of the present disclosure;
FIG. 4 is a block diagram of a lens module control system provided in another exemplary embodiment of the present disclosure;
FIG. 5 is a schematic view of a lens module according to an exemplary embodiment of the present disclosure;
FIG. 6 is an enlarged view of a portion of FIG. 5A;
fig. 7 is a schematic structural view of a lens module according to another exemplary embodiment of the present disclosure;
FIG. 8 is an enlarged view of a portion of B in FIG. 7;
fig. 9 is a schematic structural view of a lens module according to another exemplary embodiment of the present disclosure;
FIG. 10 is an enlarged view of a portion of C in FIG. 9;
FIG. 11 is a schematic diagram of the movement of a brake mechanism provided by an exemplary embodiment of the present disclosure;
fig. 12 is a schematic structural view of a lens module according to another exemplary embodiment of the present disclosure;
FIG. 13 is a schematic view of the movement of a brake mechanism provided by another exemplary embodiment of the present disclosure;
FIG. 14 is a schematic view of the movement of a brake mechanism provided by another exemplary embodiment of the present disclosure;
FIG. 15 is a schematic view of a movement of a brake mechanism provided by another exemplary embodiment of the present disclosure;
FIG. 16 is a schematic view of a lens module provided by another exemplary embodiment of the present disclosure;
fig. 17 is a partial enlarged view of D in fig. 16;
fig. 18 is a schematic view of a movement of a brake mechanism provided by another exemplary embodiment of the present disclosure.
Description of the reference numerals
1 base 11 second mounting block 12 third mounting block
2 the friction part 22 bimetallic strip of the braking mechanism 21
23 binding post 24 keeps portion 241 connecting plate
25SMA wire 31 lens 32 carrier
321 first mounting block 4 Hall magnet 5 integrated circuit
Receiving module of 6-circuit board 2011 detection module 201
202 first control module 203 second control module
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
In this disclosure, unless otherwise indicated, directional terms such as "inner and outer" are used with respect to the contour of the respective component parts themselves. Furthermore, the terms "first," "second," and the like, as used in embodiments of the present disclosure, are used for distinguishing one element from another and not for order or importance. 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 present disclosure provides a lens module control method, in which, referring to fig. 5, 7 and 9, a lens module includes a lens module, a base 1 for mounting the lens module, and a brake mechanism 2 fixed to the base 1 and capable of holding the lens module, and fig. 1 is a flowchart of a lens module control method provided in an exemplary embodiment of the present disclosure, the method including the steps of: in step s101, position information of a lens module is acquired; here, the position information of the lens module may include position information that causes shake of the lens module due to the influence of the handheld device or external motion, or may include position information that is not in focus when the device photographs.
In step s102, the brake mechanism 2 is controlled to be energized to release the lens module; in this step, the brake mechanism 2 is capable of holding the lens module in a non-energized state, holding the lens module in a fixed state, and after the position information of the lens module is acquired, energizing the brake mechanism 2, and releasing the lens module by the brake mechanism 2.
Then, after the brake mechanism 2 releases the lens module, in step s103, the lens module is controlled to operate according to the position information; in this step, the lens module performs an anti-shake or focusing operation according to the position information.
Finally, at step s104, when the lens module reaches the target position, the brake mechanism 2 is controlled to be de-energized to hold the lens module. In this step, the target position refers to a position where the lens module can perform shooting after compensating for shake or completing focusing, and at this time, the brake mechanism 2 may hold the lens module again, so that the lens module is held at the target position for shooting. The target position is a predetermined position that has been set in the system, and in this control process, the system continuously acquires the position information of the lens module until the acquired position information matches the predetermined target position, and the lens module stops operating, and the brake mechanism is turned off to hold the lens module.
Through the technical scheme, the brake mechanism 2 which is released after the lens module is electrified and kept after the power is cut off is designed, and when the anti-shake or focusing function is not used, the lens module can be quickly stopped by the brake mechanism 2 after the brake mechanism 2 is powered off, so that the system is quickly and stably. In the shooting state, the braking mechanism 2 can keep the position of the lens module unchanged, and the lens module is not required to be continuously electrified to keep the position of the lens module, so that the stability is prevented from being reduced due to the fact that the temperature of the lens module is increased. In addition, under the condition that equipment is not used, the braking mechanism 2 always keeps the lens module in a power-off state, abnormal sound is avoided from being generated due to shaking or impact of the equipment, user experience is influenced, the service performance of the lens module can be guaranteed, and the service life of the equipment is prolonged.
Fig. 2 is a flowchart provided by another exemplary embodiment of the present disclosure, before the lens module reaches the target position, at step s1041, reducing the current through the brake mechanism 2 as the lens module approaches the target position so that the brake mechanism 2 contacts the lens module. Here, it is possible to always acquire positional information of the lens module during the operation of the lens module, and in the case where the lens module is located near the target position, by reducing the current passing through the brake mechanism 2, the brake mechanism 2 is brought into contact with the lens module, thereby increasing the friction between the brake mechanism 2 and the lens module, and thus, it is possible to play a role in decelerating the lens module. Thus, under the action of the braking mechanism 2, the speed of the lens module can be reduced more quickly, and the speed reduction control capability of the lens module is improved. Wherein the current through the brake mechanism 2 may be gradually reduced as the lens module approaches the target position, i.e. the closer to the target position, the smaller the current through the brake mechanism 2 until it is reduced to zero.
In the embodiment of the present disclosure, referring to fig. 6, 8 and 10, the braking mechanism 2 may include a friction portion 21 for contacting the lens module, when the lens module approaches the target position, the current passing through the braking mechanism 2 is reduced to cause the friction portion 21 to form a first pressure on the lens module, and when the lens module reaches the target position, the braking mechanism 2 is controlled to be de-energized to cause the friction portion 21 to form a second pressure on the lens module that is greater than the first pressure. It will be appreciated that the friction portion 21 may be elastically deformed when pressure is applied to the lens module, the greater the amount of deformation, the greater the pressure applied to the lens module, i.e. when the current through the braking mechanism 2 is reduced, the friction portion 21 is slightly elastically deformed, the resulting first pressure may slow down the movement of the lens module without retaining the lens module in place. In the case where the brake mechanism 2 is de-energized, the amount of deformation generated by the friction portion 21 is maximized, and the generated second pressure, which is greater than the first pressure, can hold the lens module stationary. The problem of deceleration and retention of the lens module can be well solved by providing the friction portion 21 through elastic deformation, and contact with the lens module does not cause abrasion to the lens module. Wherein the friction part 21 may be made of rubber material or other wear-resistant material, and when the lens module includes the following carrier 32 made of rubber material, the friction part 21 may also be made of elastic metal material, so as to prevent both from rubbing and dusting, ensure the cleanliness of the device, and avoid dust pollution. In addition, in order to better avoid friction dusting, the friction portion 21 may be provided with rounded corners, so that the friction portion 21 and the lens module are smoothly engaged.
According to one embodiment of the present disclosure, the braking mechanism may include an actuating portion mounted on the base 1 and a holding portion 24 for holding the lens module and interlocking with the actuating portion, and the step of controlling the braking mechanism 2 to be energized to release the lens module includes: controlling the actuation portion to energize to actuate the retention portion 24 to release the lens module; the step of controlling the brake mechanism 2 to be de-energized to hold the lens module includes: the control operation unit is powered off to return the holding unit 24 to hold the lens module.
In the embodiment of the disclosure, the holding portion 24 may have elasticity, when the operation portion is powered on, the operation portion may drive the holding portion 24 to elastically deflect, and when the operation portion is powered off, the holding portion 24 may elastically return. The holding part 24 may be made of a material having elasticity, and in the power-off state, the holding part 24 may be preloaded on the lens module by a pre-pressure generated by its own elasticity, thereby holding the lens module.
Specifically, as shown in fig. 6, in one embodiment, the actuating portion may be made of a bimetal 22, the holding portion 24 is connected to the bimetal 22, the active layer of the bimetal 22 is disposed at a side close to the lens module, the passive layer of the bimetal 22 is disposed at a side far from the lens module, and when the temperature increases, the deformation of the active layer is greater than that of the passive layer, so that the whole of the bimetal 22 is bent toward the passive layer side. Thus, the step of controlling the actuation of the braking mechanism 2 to release the lens module comprises: controlling the bimetallic strip 22 to be electrified so that the bimetallic strip 22 drives the holding part 24 to bend towards one side of the passive layer; the step of controlling the brake mechanism 2 to be de-energized to clamp the lens module includes: the bimetal 22 is controlled to be powered off, and the bimetal 22 returns the holding portion 24 to the side of the active layer. Referring to fig. 11, shown in phantom in fig. 11 is a schematic view of the bi-metallic strip 22 after being energized. According to the characteristics of the bimetallic strip, the temperature of the bimetallic strip 22 can be increased after the bimetallic strip 22 is electrified, the active layer bends towards one side of the passive layer, so that the lens module is released, the temperature of the bimetallic strip 22 is reduced after the bimetallic strip 22 is powered off, and the active layer drives the passive layer to return to the clamping state of the lens module. When the actuating portion is made of a bimetal, the holding portion 24 may be made of a bimetal, and the active layer and the passive layer of the holding portion 24 may be disposed in the same manner as the actuating portion.
In another embodiment, the operation portion may be made of a shape memory alloy, and the operation portion has a high-temperature phase shape when energized and a low-temperature phase shape when de-energized. In the release position, the operating portion is energized, and the operating portion takes a high-temperature phase shape capable of deflecting the holding portion 24 to a side away from the lens module, i.e., a state shown by a broken line in fig. 11; in the holding position, the operation portion is de-energized, and the operation portion takes a low-temperature phase shape capable of returning the holding portion 24 to the side close to the lens module, that is, a state shown by a solid line in fig. 11.
Based on the above embodiment, as shown in fig. 6, the operation portion may be configured in a U-shaped structure, and connection terminals 23 for connection with the circuit board 6 are formed on both side walls of the U-shaped structure, respectively, for energizing the operation portion. The operation portion may be attached to the base 1 by means of adhesion or heat staking. The brake mechanism 2 may be disposed in a vertical manner as shown in fig. 1, or may be disposed horizontally as shown in fig. 12, and the specific arrangement manner thereof is not particularly limited in the present disclosure.
As shown in fig. 8 and 10, when the actuating portion is made of a shape memory alloy, in another embodiment, the actuating portion may include an SMA (shape memory alloys, shape memory alloy) wire 25 disposed at one end of the holding portion 24, the SMA wire 25 having a high temperature phase shape that stretches or contracts at a high temperature and a low temperature phase shape opposite to the high temperature phase shape at a low temperature, and the step of controlling the brake mechanism 2 to be energized to release the lens module may include: controlling the SMA wire 25 to be electrified so as to drive the holding part 24 to deflect towards the side far away from the lens module through the high-temperature phase shape of the SMA wire 25; the step of controlling the brake mechanism 2 to be de-energized to hold the lens module includes: the SMA wire 25 is controlled to be de-energized to return the holding portion 24 to the side closer to the lens module by the low-temperature phase shape of the SMA wire 25. Here, the lens module is described as an example including the lens 31 and the carrier 32 for mounting the lens 31, and the holding portions 24 may be two to sandwich the carrier 32. Alternatively, the number of the holding portions 24 may be one, for example, one, or four, or may be four, and may be uniformly distributed in the circumferential direction of the carrier 32. In one embodiment, as in the brake mechanism 2 shown in fig. 7 and 8, a first end of the holding portion 24 is provided on a side of the carrier 32 for sandwiching the carrier 32, a second end of the holding portion 24 opposite to the first end is connected to the SMA wire 25, and a region of the holding portion 24 between the first end and the second end is rotatably mounted on the base 1 so that the first end and the second end move in opposite directions. In this way, the holding portion 24 forms a lever structure by means of a pivot point mounted on the base 1, i.e. when the SMA wire 25 is contracted or stretched at the second end, it will bring about a movement of the first end accordingly. Referring to fig. 13, when the SMA wire 25 is disposed on a side of the second end (i.e., a left side of the SMA wire 25 in the drawing) far from the carrier 32, the SMA wire 25 may be made to take a stretched high-temperature phase shape after being energized, so that the second end is deflected toward a side near the carrier 32 (i.e., a right side of the SMA wire 25 in the drawing), and the first end is far from the carrier 32, thereby releasing the carrier 32, and the SMA wire 25 takes a contracted low-temperature phase shape after being de-energized, so that the first end returns to clamp the carrier 32; similarly, referring to fig. 14, fig. 14 is a schematic diagram illustrating movement of a brake mechanism according to another embodiment of the present disclosure, and a dotted line is a state of the brake mechanism after being energized, when the SMA wire 25 is disposed on a side of the second end close to the carrier 32, the SMA wire 25 may be in a contracted high-temperature phase shape after being energized, so that the second end deflects toward a side close to the carrier 32 while the first end is far away from the carrier 32, and similarly returns in an opposite direction, which is not described herein.
Specifically, with continued reference to fig. 14, when the SMA wire 25 is disposed on the side of the second end that is proximate to the carrier 32 as described above, the second ends of the two holders 24 may be connected by the SMA wire 25, as described above, when the SMA wire 25 has a high-temperature phase shape that contracts at a high temperature and a low-temperature phase shape that stretches at a low temperature. The two holding parts 24 can be controlled simultaneously by the same SMA wire 25, so that the control program is simplified, the actions of the two holding parts 24 can be consistent, and the holding of the carrier 32 by the holding parts 24 is ensured to be more stable.
Further, referring to fig. 8 and 14, the carrier 32 may be provided with a first mounting block 321 protruding thereon, and the first ends of the two holding portions 24 may be sandwiched on both sides of the first mounting block 321 to facilitate the mounting of the brake mechanism 2. Also, in order to facilitate the installation of the holding parts 24, the base 1 may be formed with a second installation block 11 between the two holding parts 24, and a region of the holding part 24 between the first and second ends may be rotatably installed on the second installation block 11 by a connection plate 241 so that the first and second ends move in opposite directions. Here, to facilitate the deflection of the second end, the second mounting block 11 may be formed with a region to avoid the second end. The holding portion 24 may be rotatably mounted on the second mounting block 11 by a connection plate 241 in various manners, and in one embodiment, referring to fig. 8, the connection plate 241 may be configured to be bent laterally along the holding portion 24, the connection plate 241 may be adhered or heat-staked on the second mounting block 11, and the holding portion 24 may be made of an elastic material, such as a metal material having elasticity, so that the holding portion 24 has elasticity, thereby allowing the second end to elastically deflect with respect to the connection plate 241. In other words, after the SMA wire 25 is electrified and contracted, the second end deflects relative to the connecting plate 241 under the action of the SMA wire 25 and the self-elasticity of the holding portion 24, and after the SMA wire 25 is powered off, the second end returns under the elasticity, so as to drive the first end to return to hold the lens module. In another embodiment, the retaining portion 24 may be coupled to the connecting plate 241 by a rotational axis such that the first and second ends may deflect about the rotational axis. In other embodiments, the connection plate 241 may be omitted, and a protrusion structure may be directly formed on the base 1 to bond or rivet the shaft for mounting the holding portion 24.
According to another embodiment of the present disclosure, in addition to the above-described embodiment of the first mounting block 321 in which the holding portions 24 are clamped to the side of the carrier 32, the first ends of the two holding portions 24 may be clamped to opposite sides of the carrier 32, specifically, as shown in fig. 9, only one holding portion 24 is provided at one side of the carrier 32, and a second end of each holding portion 24 opposite to the first end is rotatably mounted on the base 1, as may be mounted on the base 1 by means of a rotation shaft as described above, or may be formed with a flange at the second end, as shown in fig. 10 and 17, the flange being adhered or heat-staked to the base 1, and the holding portions 24 being made of an elastic material so that the holding portions 24 may be elastically deflected with respect to the flange. One end of the SMA wire 25 is connected to a first end of the holding portion 24, and the other end is fixed to the base 1. The stretched or contracted shape of the SMA wire 25 may then act directly on the first end of the clamping carrier 32, making its movement more direct and the responsive movement of the retaining portion 24 more rapid. In the embodiment of the present disclosure, referring to fig. 16 to 18, one end of the SMA wire 25 may be directly connected to the base 1, and the other end may be connected to the holding portion 24 through a connection piece formed on the holding portion 24, in such a way that the SMA wire 25 may have a larger shrinkage variation, and it is easier to move the holding portion 24 away from the lens module. Further, in another embodiment, referring to fig. 10, a third mounting block 12 located at a side of the holding portion 24 away from the carrier 32 may be formed on the base 1, and the sma wire 25 is connected to the third mounting block 12, the sma wire 25 having a high-temperature phase shape that contracts at a high temperature and a low-temperature phase shape that stretches at a low temperature. Referring to fig. 15, in this case, the SMA wire 25 assumes a contracted high temperature phase shape at the first end after power-up to pull the first end away from the carrier 32, thereby releasing the lens module, and after power-down, the SMA wire 25 assumes a stretched low temperature phase shape to return the first end to grip the carrier 32. In addition, the third mounting block 12 may also be disposed on the side of the holding portion 24 adjacent to the carrier 32, in which case the SMA wire 25 may have a high-temperature phase shape and a low-temperature phase shape that are opposite to those described above, the specific movement principles of which have been described above, and which are not described in detail herein for the sake of avoiding repetition.
In this embodiment of the present disclosure, the base 1 may be provided with a position sensor, for example, a hall sensor, and the step of obtaining the position information of the lens module may include: the position information of the lens module is acquired through the position sensor, and the control method further comprises the following steps: and judging whether the position of the lens module is different from the target position according to the position information of the lens module acquired by the position sensor. Taking the lens module in fig. 5 as an example for illustration, a hall magnet 4 may be disposed on the lens module, a circuit board 6 for supplying power to the braking mechanism 2 may be mounted on the base 1, an integrated circuit 5 including a hall sensor is disposed on the circuit board 6, and the position of the lens module is determined by detecting the position of the hall magnet 4 through the hall sensor, so that the circuit board 6 is controlled to energize or de-energize the braking mechanism.
The lens module may include a lens 31, a carrier 32 for mounting the lens 31, and an electromagnetic driving mechanism for driving the carrier 32 to move, and the step of acquiring positional information of the lens module includes: acquiring position information of the carrier 32; the step of controlling the lens module to reach the target position according to the position information comprises the following steps: based on the positional information, the electromagnetic drive mechanism is controlled to be energized to drive the carrier 32 to the target position. Here, the positional information of the lens 31 may be determined by the carrier 32 for mounting the lens 31. The electromagnetic driving mechanism may be a focusing driving mechanism for focusing the device or may be an anti-shake driving mechanism for compensating for shake of the device. The electromagnetic driving mechanism may be in a reed driving form, or in a ball driving form, or in a driving form of a slide bar, which is not particularly limited in the present disclosure.
According to a second aspect of the present disclosure, there is also provided a lens module control system, and fig. 3 is a block diagram of the control system provided in an exemplary embodiment of the present disclosure. The lens module may include a lens module, a base 1 for mounting the lens module, and a brake mechanism 2 fixed to the base 1 and capable of clamping the lens module, the brake mechanism 2 including a release position for releasing the lens module when energized and a holding position for clamping the lens module when deenergized, and the control system may include: a receiving module 201 configured to acquire position information of the lens module; a first control module 202 configured to control the brake mechanism 2 to be energized or de-energized after acquiring the position information of the lens module; and a second control module 203 configured to control the lens module to act according to the position information. The first control module 202 is triggered to enable the brake mechanism 2 to be electrified to release the lens module through the position information acquired by the receiving module 201, and the second control module 203 is triggered to enable the lens module to perform shake compensation or focusing. The brake mechanism 2 may be provided with a connection terminal 23 for electrical connection with the first control module 202.
Further, the base 1 may be provided with a position sensor for detecting a position of the lens module, and as shown in fig. 4, the control system may further include: and a detection module 2011, wherein the detection module 2011 is connected with the receiving module 201 and is used for detecting the position of the lens module. In addition, the control system may further include a determination module for determining whether the position of the lens module detected by the position sensor is different from the target position, the determination module feeding back the position information detected by the position sensor to the receiving module 201, and thereby making the next action. Here, the target position is a predetermined position that has been set in the system, as described above.
According to a third aspect of the present disclosure, there is also provided a lens module including the lens module control system described above. The lens assembly has all the beneficial effects of the lens module control system, and is not described herein.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (7)
1. A lens module control method, characterized in that the lens module includes a lens module, a base (1) for mounting the lens module, and a stopper mechanism (2) fixed to the base (1) and capable of holding the lens module, the stopper mechanism (2) includes an actuating portion mounted on the base (1) and a holding portion (24) for holding the lens module and interlocking with the actuating portion, the actuating portion is made of a bimetal (22), the holding portion (24) is connected to the bimetal (22), an active layer of the bimetal (22) is provided on a side close to the lens module, and a passive layer of the bimetal (22) is provided on a side away from the lens module, the method comprising:
acquiring position information of a lens module;
controlling the bimetallic strip (22) to be electrified so that the bimetallic strip (22) drives the retaining part (24) to deflect towards one side of the passive layer;
controlling the lens module to act according to the position information;
when the lens module reaches a target position, the bimetal (22) is controlled to be powered off, and the bimetal (22) enables the retaining part (24) to return to one side of the active layer.
2. The method of claim 1, wherein, before the lens module reaches the target position,
when the lens module approaches the target position, the current through the braking mechanism (2) is reduced so that the braking mechanism (2) contacts the lens module.
3. The lens module control method according to claim 2, wherein the braking mechanism (2) includes a friction portion (21) for contacting the lens module,
reducing the current through the braking mechanism (2) when the lens module approaches the target position, causing the friction portion (21) to form a first pressure on the lens module,
when the lens module reaches a target position, the braking mechanism (2) is controlled to be powered off, so that the friction part (21) forms a second pressure on the lens module, wherein the second pressure is larger than the first pressure.
4. The lens module control method according to claim 1, wherein the base (1) is provided with a position sensor, and the step of acquiring the position information of the lens module includes:
acquiring position information of the lens module by the position sensor,
the control method comprises the following steps:
and judging whether the position of the lens module is different from the target position according to the position information of the lens module acquired by the position sensor.
5. The lens module control method according to claim 1, wherein the lens module includes a lens (31), a carrier (32) for mounting the lens (31), and an electromagnetic driving mechanism for driving the carrier (32) to move, the step of acquiring positional information of the lens module includes:
acquiring position information of the carrier (32);
the step of controlling the lens module to reach a target position according to the position information comprises the following steps:
and controlling the electromagnetic driving mechanism to be electrified according to the position information so as to drive the carrier (32) to reach a target position.
6. A lens module control system, characterized in that the lens module includes a lens module, a base (1) for mounting the lens module, and a stopper mechanism (2) fixed to the base (1) and capable of holding the lens module, the stopper mechanism (2) including a release position for releasing the lens module when energized and a holding position for holding the lens module when de-energized, the stopper mechanism (2) including an operating portion mounted to the base (1) and a holding portion (24) for holding the lens module and interlocking with the operating portion, the operating portion being made of a bimetal (22), the holding portion (24) being connected to the bimetal (22), an active layer of the bimetal (22) being provided on a side close to the lens module, and a passive layer of the bimetal (22) being provided on a side away from the lens module, the control system comprising:
a receiving module (201) configured to acquire positional information of the lens module;
a first control module (202) configured to control energization or de-energization of the brake mechanism (2) after acquiring positional information of the lens module; and
and a second control module (203) configured to control the lens module to act according to the position information.
7. The lens module control system according to claim 6, wherein the base (1) is provided with a position sensor, the control system further comprising:
and a detection module (2011) connected with the receiving module (201) and used for detecting the position of the lens module.
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