WO2018040098A1 - Lens module - Google Patents

Abstract

A temperature compensation method for a lens module (100). The method comprises: obtaining a first operation temperature of the lens module (100) by means of a temperature sensor (102); obtaining a focusing position compensation amount according to the first operation temperature; and adjusting the position of an optical lens assembly (110) according to the focusing position compensation amount.

Description

Lens module Technical field

The present disclosure relates to a lens module, and in particular to an autofocus lens module with temperature compensation.

Background technique

The lens module usually consists of an optical lens set, an image sensor, a control system, and a motor.

The planes of the image sensor and the optical lens group are parallel to each other, and the optical axis of the optical lens group vertically passes through the center of the image sensor. The control system controls the motor to drive the optical lens group to approach or away from the image sensor along the optical axis to combine the lens modes.

The image sensor and the motor generate heat during operation, thereby changing the operating temperature of the lens module, so that the optical lens group is physically deformed, and different optical lens groups have different physical deformations due to temperature changes. For a lens module that has already been in focus, the physical deformation of the optical lens group may affect the focus state of the lens module while maintaining the positional relationship of the optical lens group and the image sensor of the lens module, which may cause the lens to be severe. The module is out of focus.

Summary of the invention

In view of this, the purpose of the present disclosure is to provide a lens module that can adjust the position of an optical lens group of the lens module according to a change in operating temperature, so that the lens module is always in a focus state.

According to an aspect of the disclosure, a temperature compensation method for a lens module is provided, the method comprising: acquiring a first operating temperature of the lens module by a temperature sensor, and obtaining a focus position according to the first operating temperature a compensation amount, and adjusting a position of the optical lens group of the lens module according to the focus position compensation amount.

In accordance with another aspect of the present disclosure, a lens module with temperature compensation is provided. The lens module includes an optical lens group, a temperature sensor configured to acquire a first operating temperature of the lens module, and a control system configured to be used according to The first operating temperature acquires a focus position compensation amount, and adjusts a position of the optical lens group according to the focus position compensation amount.

According to a third aspect of the present disclosure, there is provided a non-transitory computer readable medium comprising instructions for a lens module temperature compensation program, the computer readable medium comprising: acquiring a lens module by a temperature sensor a program command of an operating temperature, a program command for acquiring a focus position compensation amount according to the first operating temperature, and a program command for adjusting a position of the optical lens group of the lens module according to the focus position compensation amount.

DRAWINGS

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a number of embodiments of the present disclosure, and other drawings may be obtained from those of ordinary skill in the art without departing from the drawings.

1 is a cross-sectional view showing a first embodiment of a lens module according to an embodiment of the present disclosure;

2 is a cross-sectional view showing a second embodiment of a lens module according to an embodiment of the present disclosure;

FIG. 3 is a flowchart of generating a focus position compensation amount according to an embodiment of the present disclosure;

4 is a flowchart of applying a focus position compensation amount according to an embodiment of the present disclosure;

5 is a cross-sectional view showing a first embodiment of a transmission mechanism of a lens module according to an embodiment of the present disclosure;

FIG. 6 is a cross-sectional view showing a second embodiment of a transmission mechanism of a lens module according to an embodiment of the present disclosure.

The main component symbol description:

Lens module	100
Optical axis	101
Temperature Sensor	102

Printed circuit board	103
Printed circuit board back	104
Printed circuit board front	105
Image Sensor	106
Lens barrel	107
Lens outer wall	108
Inner wall of the lens barrel	109
Optical lens set	110
Drive rod	111
Motor	112
gum	113
Lens module	200
Optical axis	201
Temperature Sensor	202
A printed circuit board	203
Printed circuit board back	204
Printed circuit board front	205
Image Sensor	206
Lens barrel	207
Lens outer wall	208
Inner wall of the lens barrel	209
First optical lens group	210
First drive rod	211

First motor	212
Second optical lens set	213
Second drive rod	214
Second motor	215
gum	216
Lens module	500
Motor	501
Screw	502
Optical lens set	503
Fixed slot	504
Screw hole	505
Inner wall of the lens barrel	506
gum	507
Temperature Sensor	508
Circuit board	509
Image Sensor	510
Lens barrel	511
Lens module	600
Motor	601
guide	602
Optical lens set	603
Fixed slot	604
Card slot	605

Inner wall of the lens barrel	606
gum	607
Temperature Sensor	608
Circuit board	609
Image Sensor	610
Lens barrel	611

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The terms "first", "second" and the like in the specification and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a particular order or order. It is to be understood that the terms so used are interchangeable as appropriate, and are merely illustrative of the manner in which the objects of the same. In addition, the terms "comprises" and "comprises" and "comprises", and any variations thereof, are intended to cover a non-exclusive inclusion so that a process, method, system, product, or device comprising a series of units is not necessarily limited to those elements, but may include Other units listed or inherent to these processes, methods, products or equipment.

Some embodiments of the present invention are described in detail below with reference to the accompanying drawings. The features of the embodiments and examples described below can be combined with each other without conflict.

The solution of the present disclosure will be described in detail below in conjunction with several specific embodiments.

FIG. 1 is a cross-sectional view of a lens module according to an embodiment of the present disclosure. The lens module 100 includes a lens barrel 107, a circuit board 103 and a control system (not shown), an optical lens set 110, and a transmission mechanism (not labeled). The lens barrel 107 is connected to the circuit board 103. The control The system is placed on the circuit board. The optical lens set 110 is disposed in the lens barrel 107. The transmission mechanism is electrically connected to the circuit board 103 and disposed in the lens barrel 107 for driving the optical lens group 110 to move in the lens barrel 107.

In this embodiment, the circuit board 103 is a printed circuit board (English: printed circuit board). The circuit board 103 includes a back surface 104 remote from the lens barrel 107 and a front side 105 that faces away from the back side 104. The back surface 104 is provided with a temperature sensor 102, and the front side 105 of the printed circuit board 103 is provided with an image sensor 106. The image sensor 106 and the circuit board 103 are connected together by a glue 113 (eg, dispensing). In this embodiment, the projection of the image sensor 106 in the direction of the optical axis 101 completely covers the temperature sensor 102. The image sensor 106 may include, but is not limited to, a contact image sensor (English: contact image sensor), a photosensitive coupling component (English: Contact Image Sensors), a complementary metal-oxide-semiconductor, and the like. . The temperature sensor 102 may include at least one of a thermocouple, a thermistor, a resistance temperature detector, and an IC (integrated circuit) temperature sensor. The temperature sensor 102 can detect and/or monitor the temperature of the lens module 100 in real time. In some embodiments, the temperature is an operating temperature of the lens module 100.

The optical lens group 110 is disposed on an inner wall 109 of the lens barrel 107 and parallel to a plane in which the image sensor 106 is located, and a line perpendicularly passing through the optical lens group 110 also vertically passes through the image sensor The center of 106. In some embodiments of the present disclosure, a line that passes perpendicularly through the center of the optical lens set 110 also passes vertically through the center of the image sensor 106. The optical lens set 110 includes at least one optical lens.

The control system may control the transmission mechanism to drive the optical lens group 110 to approach or away from the image sensor 106 along the optical axis according to the operating temperature of the lens module 200 detected and/or monitored by the temperature sensor 102. The directional movement causes the lens module 100 to always be in a focused state at different operating temperatures. Specifically, the transmission mechanism includes a drive rod 111 and a motor 112.

In some embodiments, the transmission mechanism can be the transmission mechanism shown in FIG. Wherein, the driving rod 111 is a screw.

In some embodiments, the transmission mechanism can be the transmission mechanism shown in FIG. Among them, The drive rod 111 is a guide rail.

In some embodiments of the present disclosure shown in FIG. 1, the temperature sensor 102 is mounted to the front side 105 of the printed circuit board 103 and detects and/or monitors the operating temperature of the lens module 100 in real time. In other embodiments, the temperature sensor 102 can also be mounted inside the image sensor 106 and detect and/or monitor the operating temperature of the lens module 100 in real time.

In other embodiments, the temperature sensor 102 can also be mounted to the inner wall 109 of the lens barrel 107 and detect and/or monitor the operating temperature of the lens module 100 in real time.

In other embodiments, the temperature sensor 102 can also be mounted to the outer wall 108 of the lens barrel 107 and detect and/or monitor the operating temperature of the lens module 100 in real time.

In other embodiments, the temperature sensor 102 is mounted inside the optical lens set 110 and detects and/or monitors the operating temperature of the lens module 100 in real time.

In other embodiments, the temperature sensor 102 can also be mounted external to the optical lens set 110 and detect and/or monitor the operating temperature of the lens module 100 in real time.

In other embodiments, the lens module 100 may include a plurality of the temperature sensors 102 respectively disposed at different portions of the lens barrel 107 or the circuit board 103.

In other embodiments, the lens module 100 can include a zoom lens.

The control system may include one or more processors, and the processing may include, but is not limited to, a microprocessor (English: microcontroller), a reduced instruction set computer (English: reduced RISC), an application specific integrated circuit (English: application specific integrated circuits, ASIC for short), dedicated instruction set processor (English: application-specific instruction-set processor, ASIP for short), central processing unit (English: central processing unit, CPU for short), physics Processor English (English: physics processing unit, referred to as: PPU), digital signal processor (English: digital signal processor, referred to as DSP), field programmable gate array (English: field programmable gate array, referred to as: FPGA).

The lens module may include one or more memory storage units, which may include non-transitory computer readable media that may store code for performing one or more of the steps described elsewhere herein, Logic or instruction. a processor of the control system, which is One or more steps are performed individually or collectively in code or logic or instructions in accordance with a non-transitory computer readable medium as described herein.

FIG. 2 is a cross-sectional view showing a lens module according to another embodiment of the present disclosure. The lens module 200 includes a lens barrel 207, a circuit board 203 and a control system (not shown), a first optical lens group 210, a second optical lens group 213, a first transmission mechanism (not labeled), and a second transmission mechanism (not Label). The lens barrel 207 is connected to the circuit board 203. The control system is disposed on the circuit board 203. The first optical lens set 210 and the second optical lens set 213 are disposed in the lens barrel 207. The first transmission mechanism and the second transmission mechanism are electrically connected to the circuit board 203, and are disposed in the lens 207 for driving the first optical lens group 210 and the second optical lens respectively. Group 213 moves within the barrel 207.

In this embodiment, the circuit board 203 is a printed circuit board (English: printed circuit board, referred to as: PCB). The circuit board includes a back side 104 remote from the lens 207 and a front side 205 that faces away from the back side 204. The back surface 204 is provided with a temperature sensor 202, and the front surface 205 of the printed circuit board 203 is provided with an image sensor 206. The image sensor 206 is coupled to the circuit board 203 by a glue 216 (eg, dispensing). In this embodiment, the projection of the image sensor 206 in the direction of the optical axis 201 completely covers the temperature sensor 202. The image sensor 206 may include, but is not limited to, a contact image sensor (English: contact image sensor), a photosensitive coupling component (English: Contact Image Sensors), a complementary metal-oxide-semiconductor, and the like. . The temperature sensor 202 may include at least one of a thermocouple, a thermistor, a resistance temperature detector, and an IC (integrated circuit) temperature sensor. The temperature sensor 202 can detect and/or monitor the temperature of the lens module 200 in real time. In some embodiments, the temperature is an operating temperature of the lens module 200.

The first optical lens group 210 is disposed on the inner wall 209 of the lens barrel 207 and parallel to the plane in which the image sensor 206 is located, and the straight line passing through the first optical lens group 210 is also vertically crossed. The center of the image sensor 206. In some embodiments of the present disclosure, a line that passes perpendicularly through the center of the first set of optical lenses 210 also passes vertically through the center of the image sensor 206. The first optical lens set 210 includes at least one optical lens.

The first optical lens group 213 is disposed on the inner wall 209 of the lens barrel 207 and parallel to the plane in which the image sensor 206 is located, and the straight line passing through the second optical lens group 213 is also vertically crossed. The center of the image sensor 206. In some embodiments of the present disclosure, a line that passes perpendicularly through the center of the second optical lens set 213 also passes vertically through the center of the image sensor 206. The second optical lens set 213 includes at least one optical lens.

In some embodiments, a line that passes vertically through the center of the first optical lens set 210 and simultaneously passes vertically through the second optical lens set 213 also passes vertically through the center of the image sensor 206.

The control system may control the first transmission mechanism to drive the first optical lens group 210 to approach or away from the optical axis according to the operating temperature of the lens module 200 detected and/or monitored by the temperature sensor 202. The direction of motion of the image sensor 206 is described. The control system may also control the second transmission mechanism to drive the second optical lens group 213 to be close to or away from the optical axis according to the operating temperature of the lens module 200 detected and/or monitored by the temperature sensor 202. The direction of the image sensor 206 moves. The lens module 200 is always in a focused state at different operating temperatures.

Specifically, the first transmission mechanism includes a first motor 212 and a first driving rod 211. The second transmission mechanism includes a second motor 215 and a second drive rod 214.

In some embodiments, the first transmission mechanism may be a transmission mechanism as shown in FIG. 5, and the second transmission mechanism may be the transmission mechanism shown in FIG. The first driving rod 211 is a screw, and the second driving rod 214 is a guide rail.

In some embodiments, the first transmission mechanism may be the transmission mechanism shown in FIG. 6, and the second transmission mechanism may be the transmission mechanism shown in FIG. The first driving rod 211 is a guide rail, and the second driving rod 214 is a screw.

In some embodiments, both the first transmission mechanism and the second transmission mechanism may be the transmission mechanism shown in FIG. 5. The first driving rod 211 is a screw, and the second driving rod 214 is also a screw.

In some embodiments, both the first transmission mechanism and the second transmission mechanism may be the transmission mechanism shown in FIG. 6. The first driving rod 211 is a guide rail, and the second driving rod 214 is also a guide rail.

In other embodiments, the temperature sensor 202 is mounted to the front side 205 of the printed circuit board 203 and detects and/or monitors the operating temperature of the lens module 200 in real time.

In other embodiments, the temperature sensor 202 is mounted inside the image sensor 206 and detects and/or monitors the operating temperature of the lens module 200 in real time.

In other embodiments, the temperature sensor 202 is mounted to the inner wall 209 of the barrel 207 and detects and/or monitors the operating temperature of the lens module 200 in real time.

In other embodiments, the temperature sensor 202 is mounted to the outer wall 208 of the barrel 207 and detects and/or monitors the operating temperature of the lens module 200 in real time.

In other embodiments, the temperature sensor 202 is mounted inside the first optical lens set 210 and detects and/or monitors the operating temperature of the lens module 200 in real time.

In other embodiments, the temperature sensor 202 is mounted external to the first optical lens set 210 and detects and/or monitors the operating temperature of the lens module 200 in real time.

In other embodiments, the temperature sensor 202 is mounted inside the second optical lens set 213 and detects and/or monitors the operating temperature of the lens module 200 in real time.

In other embodiments, the temperature sensor 202 is mounted external to the second optical lens set 213 and detects and/or monitors the operating temperature of the lens module 200 in real time.

In other embodiments, the lens module 200 includes a plurality of the temperature sensors 202.

In other embodiments, the lens module 200 includes a zoom lens.

The control system may include one or more processors, and the processing may include, but is not limited to, a microprocessor (English: microcontroller), a reduced instruction set computer (English: reduced RISC), an application specific integrated circuit (English: application specific integrated circuits, ASIC for short), dedicated instruction set processor (English: application-specific instruction-set processor, ASIP for short), central processing unit (English: central processing unit, CPU for short), physics Processor English (English: physics processing unit, referred to as: PPU), digital signal processor (English: digital signal processor, referred to as DSP), field programmable gate array (English: field programmable gate array, referred to as: FPGA).

The lens module may include one or more memory storage units, which may include non-transitory computer readable media that may be stored for execution elsewhere herein. A code, logic, or instruction that describes one or more steps. A processor of the control system that can perform one or more steps, individually or collectively, in accordance with code, logic or instructions of a non-transitory computer readable medium as described herein.

FIG. 3 is a flowchart of generating a focus position compensation amount according to an embodiment of the present disclosure. As shown in FIG. 3, the execution body of the flow is the control system of the lens module. The control system may acquire the focus position compensation amount according to the detected and/or monitored operating temperature of the lens module.

Step 301, setting an ambient temperature of the lens module.

The ambient temperature of the lens module can be represented by T _env .

Step 302: Set a focusing distance of the lens module.

The focusing distance of the lens module can be represented by D _Foucus .

Step 303: Start the lens module, and after focusing, obtain a reference focus position of the lens module and a reference working temperature.

Wherein, the reference focus position may be represented by Pos ₀ , and the reference working temperature may be represented by T ₀ . In some embodiments, the reference focus position and the reference working temperature may be a focus position and a work position after the lens module is activated at any time and after focusing.

Step 304: After the operating temperature of the lens module changes, obtain an offset focus position and an offset working temperature. Wherein, the offset focus position may be represented by Pos _n , and the offset operating temperature may be represented by T _n . In some embodiments, the offset focus position and the offset operating temperature have a one-to-one correspondence.

In some embodiments, the lens module can obtain multiple sets of offset focus positions and offset operating temperatures. For example, Pos ₁ , T ₁ , Pos ₂ , T ₂ , Pos ₃ , T ₃ , Pos ₄ , T ₄ , Pos ₅ , T ₅ , Pos ₆ , T ₆ , Pos ₇ , T ₇ , Pos ₈ , T ₈ , Pos ₉ , T ₉ , Pos ₁₀ , T _{10 ,} etc., wherein Pos ₁ corresponds to T ₁ , Pos ₂ corresponds to T ₂ , Pos ₃ corresponds to T ₃ , Pos ₄ corresponds to T ₄ , Pos ₅ corresponds to T ₅ , and Pos ₆ corresponds to T _{6 .} Pos ₇ corresponds to T ₇ , Pos ₈ corresponds to T ₈ , Pos ₉ corresponds to T ₉ , and Pos ₁₀ corresponds to T ₁₀ .

Step 305, adjusting an operating temperature of the lens module.

Step 306: Determine whether the operating temperature of the lens module completely covers the operating temperature range of the lens module.

In some embodiments, if the operating temperature of the lens module does not cover the lens module For the operating temperature range, the lens module will continue to acquire the offset focus position and the offset operating temperature. For example, after step 305, the operating temperature of the lens module is 20 ° C, and the operating temperature range of the lens module is -10 ° C to 40 ° C, the lens module will return to step 304, Then, step 305 is repeatedly performed to increase or decrease the operating temperature of the lens module until the operating temperature range of the lens module is covered.

In some embodiments, if the operating temperature of the lens module has covered the operating temperature range of the lens module, the lens module will perform step 307. For example, the operating temperature range of the lens module ranges from -10 ° C to 40 ° C, and the offset operating temperature currently recorded by the lens module has covered the operating temperature range. Then the lens module will perform step 307.

Step 307, adjusting a focusing distance of the lens module.

Step 308: Determine whether the majority lens module completely covers the focus range of the lens module.

In some embodiments, if the focus distance of the lens module does not cover the focus range of the lens module, the lens module will reset the focus distance. For example, after step 307, the focus distance of the current lens module is 50 mm, and the focus range of the lens module is 28 mm to 105 mm, then the lens module will return to step 302 to increase or decrease the The focus distance of the lens module until the focus range of the lens module is covered.

In some embodiments, if the focus distance of the lens module has covered the focus range of the lens module, the lens module will perform step 309. For example, the focus range of the lens module is 28 mm to 105 mm, and the focus distance currently recorded by the lens module has covered the focus range. Then the lens module will perform step 309.

Step 309, generating a focus position compensation amount of the lens module.

In some embodiments, the focus position compensation amount corresponds to an offset distance of the lens module and an offset of the operating temperature. Wherein the offset of the operating temperature is a difference between the offset operating temperature (T _n ) and the reference operating temperature (T ₀ ) (eg, T ₁ -T ₀ , T ₂ -T ₀ , T ₃ - T ₀ , T ₄ -T ₀ , T ₅ -T ₀ , T ₆ -T ₀ , T ₇ -T ₀ , T ₈ -T ₀ , T ₉ -T ₀ , T ₁₀ -T ₀ ), the operating temperature The offset can be represented by T _offset . Wherein the focus position compensation amount is a difference between the offset focus position (Pos _n ) and the reference focus position (Pos ₀ ) (eg, Pos ₁ -Pos ₀ , Pos ₂ -Pos ₀ , Pos _{3 )} -Pos ₀ , Pos ₄ -Pos ₀ , Pos ₅ -Pos ₀ , Pos ₆ -Pos ₀ , Pos ₇ -Pos ₀ , Pos ₈ -Pos ₀ , Pos ₉ -Pos ₀ ,Pos ₁₀ -Pos ₀ ), the combination The amount of compensation for the focus position can be expressed by Pos _compensation .

In some embodiments, the lens module can generate an index table for the amount of focus position compensation. For example, in the index table, the offset of the operating temperature (T _offset ), the focus distance, and the focus compensation amount (Pos _compensation ) are in one-to-one correspondence. The corresponding focus position compensation amount can be found by the offset of the operating temperature and the focus distance.

In some embodiments, the lens module can generate a position compensation function f(T, D) about the focus position, T can represent an offset of the operating temperature of the lens module, and D can represent The focusing distance of the lens module.

It should be noted that the process described by method 300 is only one embodiment of the disclosure and should not be considered to cover the scope of the disclosure. It will be apparent to those skilled in the art that certain modifications or changes may be made without departing from the scope of the disclosure.

FIG. 4 is a flowchart of applying a focus position compensation amount according to an embodiment of the present disclosure.

Step 401: Acquire an operating temperature of the lens module by using a temperature sensor. In some embodiments, the operation of the lens module is an operating temperature of the lens module in a focus state.

Step 402: Detect whether an operating temperature of the lens module is offset. If the operating temperature of the lens module is not offset, the lens module will continue to obtain the operating temperature of the lens module through the temperature sensor. If the operating temperature of the lens module is offset, the lens module will continue the behavior of step 403.

Step 403, the lens module acquires a focus position compensation amount according to an offset of the working temperature and a focus distance.

In some embodiments, after the lens mode is combined, the current focus distance can be recorded for later acquisition of the focus position compensation amount.

In some embodiments, the focus distance of the lens module each time it is in the focus state can be recorded for later obtaining the focus position compensation amount.

In some embodiments, the motor of the lens module is a stepping motor, and the focusing distance of the lens module can be obtained by calculating the running step of the stepping motor.

In some embodiments, the lens module will find the corresponding focus position compensation amount through the index table according to the offset of the operating temperature.

In some embodiments, the lens module calculates the focus position compensation amount by a position compensation function according to an offset of the operating temperature.

Step 404, the lens module adjusts the position of the optical lens group according to the focus position compensation amount, so that the lens module is always in a focus state.

It should be noted that the process described by method 300 is only one embodiment of the disclosure and should not be considered to cover the scope of the disclosure. It will be apparent to those skilled in the art that certain modifications or changes may be made without departing from the scope of the disclosure.

FIG. 5 is a cross-sectional view showing a first embodiment of a transmission mechanism of a lens module according to an embodiment of the present disclosure.

The lens module 500 includes a control system, a transmission mechanism (not labeled), a lens barrel 511, a circuit board 509, and an optical lens group 503.

The transmission mechanism includes a motor 501 and a screw 502. One end of the screw 502 is connected to the motor 501, and the other end of the screw 502 is connected to the optical lens group 503. Specifically, the non-optical zone of the optical lens set 503 includes a screw hole 505 that can be screwed to the screw hole 505 of the non-optical zone of the optical lens set 503. A fixing groove 504 is defined in the inner wall 506 of the lens barrel 511. The other end of the optical lens group 503 is disposed in the fixing groove 504.

The image sensor 510 and the circuit board 509 are connected together by a glue 507 (eg, dispensing). After the operating temperature of the lens module 500 changes, the glue 507 and/or the optical lens group 503 are deformed, thereby defocusing the lens module 500. In view of the above deficiencies, the present disclosure proposes a lens module with temperature compensation, which can adjust the position of the optical lens group 503 according to the change of the working temperature, so that the lens is always in the focus state.

In some embodiments, the control system of the lens module 500 can drive the motor 501 to rotate according to the temperature detected and/or monitored by the temperature sensor, thereby driving the screw 502 to rotate. The optical lens group 503 is further moved. For example, the screw 502 can drive the optical lens group 503 closer to or away from the image sensor 508 along the optical axis.

In some embodiments, the motor 501 driving the screw 502 to rotate clockwise can drive the optical lens assembly 503 away from the image sensor. Conversely, the motor 501 driving the screw 502 to rotate counterclockwise can drive the optical lens group 503 close to the image sensor.

In other embodiments, the motor 501 driving the screw 502 to rotate clockwise can drive the optical lens group 503 close to the image sensor. Conversely, the motor 501 driving the screw 502 to rotate counterclockwise can drive the optical lens assembly 503 away from the image sensor.

It should be noted that the above description of the transmission mechanism is for ease of understanding of the disclosure and should not be considered as the only implementation of the disclosure. For example, the motor 501 can drive the screw 502 to rotate by one and/or a plurality of gears.

FIG. 6 is a cross-sectional view showing a second embodiment of a transmission mechanism of a lens module according to an embodiment of the present disclosure.

The lens module 600 includes a control system, a transmission mechanism (not labeled), a lens barrel 611, a circuit board 609, and an optical lens group 603.

The transmission mechanism includes a motor 601 and a guide rail 602. One end of the guide rail 602 is connected to the motor 601, and the other end of the guide rail 602 is connected to the optical lens group 603. Specifically, the non-optical zone of the optical lens set 603 includes a card slot 605 that can be engaged with the card slot 605 of the non-optical zone of the optical lens set 603. A fixing groove 604 is defined in the inner wall 606 of the lens barrel 611. The other end of the optical lens group 603 is disposed in the fixing groove 604.

The image sensor 610 and the circuit board 609 are connected together by a glue 607 (eg, dispensing). After the operating temperature of the lens module 600 changes, the glue 607 and/or the optical lens group 603 may be deformed, thereby defocusing the lens module 600. In view of the above deficiencies, the present disclosure proposes a lens module with temperature compensation, which can adjust the position of the optical lens group 603 according to the change of the working temperature, so that the lens is always in the focus state.

In some embodiments, the control system of the lens module 600 can drive the motor 601 to rotate according to the temperature detected and/or monitored by the temperature sensor, thereby driving the guide rail 602 to move. The optical lens group 603 is further moved. For example, the guide rail 602 can drive the optical lens group 603 closer to or away from the image sensor 608 along the optical axis. The motor 601 is coupled to the rail 602 by a gear 612 that is oriented perpendicular to the plane in which the rail is located.

It should be noted that the above description of the transmission mechanism is for ease of understanding of the disclosure and should not be considered as the only implementation of the disclosure. For example, the motor 601 can drive the rail 602 to move by a plurality of gears.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformation of the present invention and the contents of the drawings may be directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of the present invention.

The disclosure of this patent document contains material that is subject to copyright protection. This copyright is the property of the copyright holder. The copyright owner has no objection to the reproduction of the patent document or the patent disclosure in the official records and files of the Patent and Trademark Office.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present disclosure, and are not intended to be limiting; although the present disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the disclosure. range.

Claims (24)

1. A method for temperature compensation of a lens module, the method comprising:

   Obtaining a first working temperature of the lens module by using a temperature sensor;

   Obtaining a focus position compensation amount according to the first working temperature; and

   Adjusting a position of the optical lens group of the lens module according to the focus position compensation amount.
2. The method according to claim 1, wherein the obtaining the focus position compensation amount according to the first operating temperature comprises:

   Acquiring, by the temperature sensor, a second working temperature of the lens module;

   Obtaining an offset of the operating temperature according to the first operating temperature and the second operating temperature; and

   The focus position compensation amount is acquired according to the offset of the operating temperature.
3. The method of claim 2 wherein the offset of the operating temperature is the difference between the first operating temperature and the second operating temperature.
4. The method according to claim 2, wherein the first operating temperature is an operating temperature of the lens module in a focus state.
5. The method according to claim 2, wherein the obtaining the focus position compensation amount according to the offset of the operating temperature comprises:

   Obtaining a focusing distance of the lens module;

   The focus position compensation amount is obtained according to the shift amount of the operating temperature and the focus distance.
6. The method according to claim 5, wherein the obtaining the focus position compensation amount according to the offset of the operating temperature and the focus distance further comprises:

   The focus position compensation amount is searched by an index table according to the shift amount of the operating temperature and the focus distance.
7. The method according to claim 5, wherein the obtaining the focus position compensation amount according to the offset of the operating temperature and the focus distance further comprises:

   The focus position compensation amount is calculated by a position compensation function according to the shift amount of the operating temperature and the focus distance.
8. The method of claim 7 wherein said position compensation function is a binary function of an offset with respect to said operating temperature and said focus distance.
9. A lens module with temperature compensation, the lens module comprising:

   Optical lens set;

   a temperature sensor configured to acquire a first operating temperature of the lens module; and

   A control system configured to:

   Obtaining a focus position compensation amount according to the first working temperature; and

   The position of the optical lens group is adjusted according to the focus position compensation amount.
10. The lens module according to claim 9, wherein the obtaining a focus position compensation amount according to the first working temperature comprises:

    Obtaining a second operating temperature of the lens module generated by the temperature sensor;

    Obtaining an offset of the operating temperature according to the first operating temperature and the second operating temperature; and

    The focus position compensation amount is acquired according to the offset of the operating temperature.
11. The lens module according to claim 10, wherein the offset of the operating temperature is a difference between the first operating temperature and the second operating temperature.
12. The lens module according to claim 10, wherein the first operating temperature is an operating temperature of the lens module in a focus state.
13. The lens module according to claim 10, wherein the obtaining a focus position compensation amount according to the offset of the operating temperature comprises:

    Obtaining a focusing distance of the lens module;

    The focus position compensation amount is obtained according to the shift amount of the operating temperature and the focus distance.
14. The lens module according to claim 13, wherein the obtaining the focus position compensation amount according to the offset of the operating temperature and the focusing distance further comprises:

    The focus position compensation amount is searched by an index table according to the shift amount of the operating temperature and the focus distance.
15. The lens module according to claim 13, wherein the obtaining the focus position compensation amount according to the offset of the operating temperature and the focusing distance further comprises:

    The focus position compensation amount is calculated by a position compensation function according to the shift amount of the operating temperature and the focus distance.
16. The lens module according to claim 15, wherein the position compensation function is a binary function of an offset amount with respect to the operating temperature and the focus distance.
17. A non-transitory computer readable medium containing program instructions for temperature compensation of a lens module, the computer readable medium comprising:

    Obtaining, by the temperature sensor, a program instruction of the first working temperature of the lens module;

    a program instruction for acquiring a focus position compensation amount according to the first operating temperature; and

    A program command for adjusting a position of the optical lens group of the lens module according to the focus position compensation amount.
18. The non-transitory computer readable medium according to claim 17, wherein the program instruction for acquiring a focus position compensation amount according to the first operating temperature comprises:

    Obtaining, by the temperature sensor, a program instruction of a second working temperature of the lens module;

    a program instruction for obtaining an offset of the operating temperature according to the first operating temperature and the second operating temperature; and

    A program command for acquiring a focus position compensation amount is obtained according to the offset of the operating temperature.
19. The non-transitory computer readable medium according to claim 18, wherein the offset of the operating temperature is a difference between the first operating temperature and the second operating temperature.
20. The non-transitory computer readable medium according to claim 18, wherein the first operating temperature is an operating temperature of the lens module in a focus state.
21. The non-transitory computer readable medium according to claim 18, wherein the program instruction for acquiring a focus position compensation amount according to the offset of the operating temperature comprises:

    Obtaining a program instruction of a focus distance of the lens module;

    A program command for acquiring a focus position compensation amount is obtained according to the shift amount of the operating temperature and the focus distance.
22. The non-transitory computer readable medium according to claim 21, wherein the program instruction for acquiring the focus position compensation amount according to the offset of the operating temperature and the focus distance further comprises:

    The program command for finding the focus position compensation amount is searched by an index table according to the offset amount of the operating temperature and the focus distance.
23. The non-transitory computer readable medium according to claim 21, wherein the program instruction for acquiring the focus position compensation amount according to the offset of the operating temperature and the focus distance further comprises:

    A program command for calculating the focus position compensation amount is calculated by a position compensation function according to the shift amount of the operating temperature and the focus distance.
24. The non-transitory computer readable medium according to claim 23, wherein the position compensation function is a binary function of an offset with respect to the operating temperature and the focus distance.

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