CN203522875U - A camera module suitable for portable electronic devices - Google Patents

Abstract

The utility model relates to a camera module group suitable for a portable electronic device. The camera module group comprises an imaging module, a sleeve module and a lens module. The lens module comprises at least one circle of shading part which radially projects out of an outer surface of the lens module in an optical-axis direction, and the shading part comprises a first extending face and a second extending face which is connected to the first extending face and forms a first angle; the sleeve module comprises a first inner diameter wall and a second inner diameter wall, the second inner diameter wall projects from the first inner diameter wall, the first inner diameter wall matches the first extending face, the second inner diameter wall matches the outer surface of the lens module; a first connecting face is connected between the second inner diameter wall and the first inner diameter wall, and the first connecting face matches the second extending face; through the second extending face and the first connecting face, the camera module group is suitable for shielding light rays which are incoming from a gap between the outer surface of the lens module and the second inner diameter wall of the sleeve module; and the sleeve module further comprises at least one air vent, and the air vents are suitable for reducing air damping received from motion of the lens module in the sleeve module.

Description

A camera module suitable for portable electronic devices

technical field

The utility model relates to a miniature camera module, the module can control the moving direction and moving distance of the lens barrel, and realize the stretching and/or focusing functions of the lens barrel. the

Background technique

The camera module consists of a photosensitive chip and an imaging lens group. The imaging lens group is placed in the lens barrel of the module. Only by the organic cooperation between the position of the lens barrel and the photosensitive chip can high-quality images or videos be obtained. Modern handheld devices, on the one hand, are designed to be thinner and thinner for the sake of aesthetics, the height of the camera module is also getting lower and lower, and the total height of the corresponding lens group is reduced. On the other hand, for the needs of image quality, the photosensitive chip The size of the photosensitive surface diagonal line is getting larger and larger. How to ensure that the field of view of the lens group remains unchanged, increase the size of the photosensitive chip, and meet the design requirements of handheld devices with thinner bodies has always been a research problem in the handheld device design industry. . Digital cameras, especially ultra-thin digital cameras, use telescopic lens groups to solve this problem, such as mechanical transmission structures such as screw/nut structure, gear structure, or worm gear structure, but such structures are relatively large and cannot be placed on mobile phones. , laptops, Pads and other thinner devices. However, the lens barrel of the voice coil motor commonly used in existing thin and light equipment cannot extend out of the camera module, and can only be used for auto-focusing. It cannot realize the function of stretching and contracting the lens group during work, so it cannot solve the above-mentioned camera module height. problems caused by lower and lower levels. In addition, in the existing camera module, in order to keep the lens barrel in a certain position, it is necessary to continuously supply current to the coil to balance the elastic force of the elastic body. When moving, due to the lack of guiding structure in the direction of the optical axis, it is easy to shake, resulting in the eccentricity of the optical path and affecting the image quality. the

In addition, for miniature camera modules suitable for consumer electronics devices, the entire camera module needs to be light-transparently sealed. Existing camera modules at home and abroad generally adopt the following light-shielding structure: the photosensitive chip is semi-enclosed by the base, and the magnetic The inner wall surface of the yoke ring, the lens barrel and the coils around the lens barrel form a cavity, which seals the stray light outside the lens in the cavity, thereby playing a light-shielding effect. This existing structure is only suitable for camera modules with a small lens stroke. For a camera module with a significantly retractable lens and a large stroke, the length of the coil is not enough to form a cavity within the full stroke range, so a new method is needed. structure to achieve shielding of stray light outside the lens. the

In addition, the existing camera module hardly needs to consider the influence of air damping due to its small stroke. the

Utility model content

For a camera module with a significantly retractable lens and a large stroke, air damping becomes a non-negligible factor. Therefore, a new structure is needed to adjust the air flow in the module and reduce air damping. Dust, to prevent dust particles in the air from affecting the imaging of the photosensitive chip. It can be seen that thin and light electronic devices need a new micro-camera module that can effectively shield light and effectively reduce air damping. the

In view of the above technical problems, the utility model proposes a camera module suitable for portable electronic devices, the camera module includes an imaging module, a sleeve module, and the The lens module that the module moves relative to the direction of the optical axis is characterized in that:

The lens module includes at least one ring of light-shielding parts radially protruding from the outer surface of the lens module along the optical axis direction, and the light-shielding part includes a first extending surface along the optical axis direction and a the second extension plane of the first angle;

The sleeve module includes a first inner diameter wall and a second inner diameter wall suitable for axial movement of the lens module, the second inner diameter wall protrudes from the first inner diameter wall, and the first inner diameter wall matches the first inner diameter wall An extension surface, the second inner diameter wall is matched with the outer surface of the lens module; a first connection surface is connected between the second inner diameter wall and the first inner diameter wall, and the first connection surface is matched with the second inner diameter wall An extension surface; through the second extension surface and the first connection surface, it is suitable for shielding incident light along the gap between the outer surface of the lens module and the second inner diameter wall of the sleeve module;

The sleeve module also includes: at least one air hole penetrating through the outer wall of the sleeve module, which is suitable for reducing the air damping received by the lens module during the movement of the sleeve module. the

In an embodiment according to the present invention, a filter membrane corresponding to the air hole is provided on the inner side of the outer wall of the sleeve module. the

In an embodiment according to the present invention, 3 to 5 lenses are installed in the lens module along the optical axis. the

In an embodiment according to the present invention, the width of the camera module is greater than or equal to 7mm. the

In an embodiment according to the present invention, the height of the camera module is 4.5mm˜6.5mm. the

In an embodiment according to the present invention, the height of the lens module is 3.95mm˜6mm. the

In an embodiment according to the present invention, the diameter of the lens module is 5mm˜7.5mm. the

In one embodiment according to the present invention, the diameter of the air holes is 0.3 mm˜1 mm. the

In an embodiment according to the present invention, the first angle is: 30 degrees to 150 degrees. the

The camera module suitable for portable electronic devices proposed by the utility model can effectively shield light and effectively reduce air damping. the

Description of drawings

Fig. 1 is a schematic diagram of the appearance three-dimensional structure of the camera module according to the present utility model;

Fig. 2 is a structural exploded view of the camera module according to the first embodiment of the present utility model;

3A and 3B are a front view and a side sectional view along the optical axis direction of the camera module according to the first embodiment of the present utility model;

Fig. 4 is a structural exploded view of the camera module according to the second embodiment of the present utility model;

5A and 5B are a front view and a side sectional view along the optical axis direction of the camera module according to the second embodiment of the present invention;

FIG. 6 is a schematic diagram of an exploded structure of a camera module according to a third embodiment of the present invention;

7A and 7B are the front view and the top view along the optical axis direction of the camera module according to the third embodiment of the present invention;

Fig. 8 is a schematic diagram of voltage and current signals driven by a voltage source according to the present invention;

Fig. 9 is a schematic diagram of current and voltage signals driven by a current source according to the present utility model; and

FIG. 10 is a flowchart of a method for controlling the lens barrel of the camera module to perform single-step movement according to the present invention. the

Detailed ways

In a nutshell, in view of the above technical problems, the utility model proposes a camera module suitable for portable electronic devices. The camera module includes an imaging module, a sleeve module, and an optional The lens module corresponding to the movement of the sleeve module relative to the direction of the optical axis is characterized in that:

The lens module includes at least one ring of light-shielding parts radially protruding from the outer surface of the lens module along the optical axis direction, and the light-shielding part includes a first extending surface along the optical axis direction and a the second extension plane of the first angle;

The sleeve module includes a first inner diameter wall and a second inner diameter wall suitable for axial movement of the lens module, the second inner diameter wall protrudes from the first inner diameter wall, and the first inner diameter wall matches the first inner diameter wall An extension surface, the second inner diameter wall is matched with the outer surface of the lens module; a first connection surface is connected between the second inner diameter wall and the first inner diameter wall, and the first connection surface is matched with the second inner diameter wall An extension surface; through the second extension surface and the first connection surface, it is suitable for shielding incident light along the gap between the outer surface of the lens module and the second inner diameter wall of the sleeve module;

The sleeve module also includes: at least one air hole penetrating through the outer wall of the sleeve module, which is suitable for reducing the air damping received by the lens module during the movement of the sleeve module. the

In an embodiment according to the present invention, a filter membrane corresponding to the air hole is provided on the inner side of the outer wall of the sleeve module. the

In an embodiment according to the present invention, 3 to 5 lenses are installed in the lens module along the optical axis. the

In an embodiment according to the present invention, the width of the camera module is greater than or equal to 7mm. the

In an embodiment according to the present invention, the height of the camera module is 4.5mm˜6.5mm. the

In an embodiment according to the present invention, the height of the lens module is 3.95mm˜6mm. the

In an embodiment according to the present invention, the diameter of the lens module is 5mm˜7.5mm. the

In one embodiment according to the present invention, the diameter of the air holes is 0.3 mm˜1 mm. the

In an embodiment according to the present invention, the first angle is: 30 degrees to 150 degrees. the

There is a certain gap between the first extension surface and the wall corresponding to the first inner diameter. When molding the first extension surface, it corresponds to the standard setting positive tolerance, and when molding the first inner diameter wall, it corresponds to The standard sets the negative tolerance, wherein the sum of the positive tolerance and the negative tolerance is the width of the gap, the width of which is less than or equal to 0.1 mm, and the width of the first connecting surface is at least greater than the width of the gap. the

Below in conjunction with accompanying drawing 1-10, describe the specific embodiment of the utility model in detail. the

FIG. 1 is a schematic diagram of the appearance and three-dimensional structure of the camera module according to the present invention. It can be seen from the figure that the lens module in the center can extend out of the entire module, and can be in three states: not extended, partially extended, and extended to the farthest end. the

First embodiment:

Fig. 2 is a schematic exploded view of the structure of the camera module according to the first embodiment of the present invention, and Fig. 3A and Fig. 3B are the front view and the direction along the optical axis of the camera module according to the first embodiment of the present invention side sectional view of

As can be seen from the figure, the camera module according to the present invention includes: an imaging module 12, a sleeve module 20, and a camera mounted in the sleeve module 20 that can correspond to the movement of the sleeve module 20 relative to the direction of the optical axis. The lens module 30, at least one coil 7 (one coil in this embodiment), at least one magnetic component 4 (eight magnetic components that can be combined into a circle in this embodiment), are arranged on the lens module 30 and the sleeve The elastic member 9 between the barrel modules 20, wherein, in order to maintain the static state without the need for electric current to reduce the power consumption of the entire camera module in the camera module according to the utility model , the elastic member 9 is pressed against the lens module 30, and the deformation of the elastic member 9 perpendicular to the optical axis direction exerts a radial positive pressure on the lens module 30, and the elastic member 9 acts on the contact surface between the elastic member 9 and the lens module 30 through the positive pressure generate a friction force along the direction of the optical axis, which can keep the lens module 30 in a stationary state relative to the elastic member 9 in the direction of the optical axis; and

In this embodiment, the power supply device provides current for the camera module, and controls the power supply control device (as shown in FIG. 8 ) of the imaging module to provide current for the coil 7. The coil 7 matches the lens module 30, and the lens module 30 Received the electromagnetic force along the optical axis direction, the electromagnetic force serves as the driving force for the lens module 30 to move linearly along the optical axis direction, so as to drive the lens module 30 to move. the

See also Fig. 2, Fig. 3A and Fig. 3B, Fig. 8, Fig. 9, Fig. 10, Fig. 8 is a schematic diagram of voltage and current signals driven by a voltage source according to the utility model; Fig. 9 is a schematic diagram of a current source driven according to the utility model Fig. 10 is a flow chart of the method for controlling the lens barrel of the camera module for single-step movement according to the utility model. Specifically, the drive unit (not labeled) is controlled by the power supply control device (not labeled) to make the current passed into the coil 7 pulse-like, so that the lens module 30 can realize discontinuous movement, and the maximum value of the pulse current is the same as The ratio of the absolute value of the minimum value is at least 1.2 times, 2 times is used in this embodiment, and the single pulse width of the pulse current is less than 2s, which is 1s in this embodiment. At the first moment, the drive unit feeds an initial current to the coil 7 through the control of the power supply control device, so that the coil 7 and the magnetic component 4 are relatively stationary, and the voltage in the detection coil 7 of the detection feedback unit (not marked) is divided by the current The value of is maintained as the first relation, namely: U/I=R. Then, the magnitude of the initial current will be gradually increased, so that the coil 7 and the magnetic component 4 will move relative to each other, so that the value of the voltage in the coil 7 divided by the current is the second relationship, that is, U/I>R; the detection feedback unit detects the coil The change in the first relationship of voltage divided by current in 7 can determine that the coil 7 and the magnetic component 4 have relative motion, and obtain the critical current value that causes the coil 7 and the magnetic component 4 to move relative to each other. Wherein, the movement of the lens module 30 is a relative forward or reverse movement relative to the elastic component along the direction of the optical axis, and each relative forward or reverse movement has a first movement distance, and the first movement distance is determined by The positive radial pressure of the elastic member 9, the magnitude of the pulse current in the coil 7, the rate of rise, the waveform width, and the coefficient of friction between the lens module 30 and the elastic member 9 are determined; specifically:

Distance formula for single-step motion

$\mathrm{<span\; class="notranslate">\; S</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; wxya</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; wxya</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; mg</span>}\mathrm{<span\; class="notranslate">\; cos</span>}\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; mg</span>}\mathrm{<span\; class="notranslate">\; cos</span>}\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; \&Delta;<figure-callout\; id="2"\; label="t"\; filenames="DEST\_PATH\_HDA0000449539180000022.png"\; state="\{\{state\}\}">t</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}$

Among them, n is the number of turns of the coil, B is the magnetic induction intensity, L is the effective length of a coil, m is the mass of the moving parts, f is the friction force, I _w is the driving current, and θ is the relationship between the moving direction of the lens barrel and the gravity The included angle, Δt is the square wave pulse width.

Changing one or more of the parameters can change the first moving distance to control the movement of the lens module 30 . the

As shown in Figure 2, Figure 3A and Figure 3B, the lens module 30 also includes a motion carrier 6, a lens barrel (not indicated in the motion carrier), and a friction member 8;

The lens barrel is placed in the moving carrier 6, and the moving carrier and the lens barrel can be combined into one body or formed separately; the moving carrier 6 has several extensions 61 diverging in the radial direction; the coil 7 is placed on the extension 61 , and is adapted to move together with the lens module 30 ; the friction member 8 is placed between the extension part 61 and the elastic member 9 . In addition, the sleeve module 20 also includes a yoke ring 2 and a sleeve unit 1 placed inside the yoke ring 2, and the sleeve unit 20 protrudes from the outer end surface of the yoke ring 2 by more than 0.2mm, so as to The lens module 30 guides and protects the role of the lens module 30. Furthermore, a yoke block 3 can be placed in the yoke ring 2, and the yoke block 3 is a magnetically conductive material, which plays a role in conducting magnetism for the magnetic component 4; In the air gap, the coil 7 is placed in the air gap and can move along the optical axis direction, and the length of the air gap in the optical axis direction accounts for more than one-third of the total thickness of the camera module in the optical axis direction. Wherein, the yoke ring 2 , the sleeve unit 1 and the yoke block 3 of the sleeve module 20 are formed integrally or separately. the

The coil 7 is connected to the first conductive part (not marked) on the lens module 30, the conductive part is in contact with the elastic part 9, the elastic part 9 is in contact with the power supply end and is suitable for supplying power through the power supply device, and the elastic part 9 can conduct electricity or There is a second conductive part, so that the power supply end can supply current to the coil 7 through the elastic part 9 or the second conductive part of the elastic part 9 . The coil 7 includes two fixed structures. In the first fixed structure, the coil 7 is directly fixedly connected to the extension 61; in the second fixed structure, there is a relative movement distance between the coil 7 and the extension 61 in the direction of the optical axis. , the relative motion distance is between 10 microns and 1 mm. The control of the power supply control device sends the control signal to the drive unit and then provides the corresponding drive signal to the coil 7 of the camera module

In the first fixed structure, there are two driving modes for the current. The first driving mode: the coil 7 feeds a current that is consistent with the relative forward direction to directly push the lens module 30 to move; the second driving mode: the coil 7. Passing a current consistent with the relative reverse direction, so that the lens module 30 stores a certain elastic potential energy, and then passing a current consistent with the relative forward direction to push the lens module 30 to move and stand still under the action of friction . the

In the second fixed structure, the current driving method is as follows: the coil 7 is fed with a current that is consistent with the relative reverse direction, so that the coil 7 stores a certain elastic potential energy, and then the current is fed with the relative forward direction. The force does positive work, and the coil 7 accumulates kinetic energy and collides with the lens module 30 to push the lens module 30 to move, and is still under the action of friction. In addition, the camera module is also provided with a base 10, the base 10 is arranged on the imaging module 12 to play the role of limiting the movement position of the lens module 30 in the optical axis direction, the camera module can also include an infrared filter, laid on the imaging module 12 on the photosensitive surface of the image sensor. the

The second embodiment:

Please refer to Fig. 4, Fig. 5, Fig. 8, Fig. 9, and Fig. 10 at the same time. Fig. 4 is an exploded view of the structure of the camera module according to the second embodiment of the present invention; Fig. 5 is a schematic diagram according to the second embodiment of the present invention A side sectional view of the camera module of a kind of embodiment along the optical axis direction;

The drive unit is controlled by the power supply control device so that the current passed into the coil 7' is pulsed, so that the lens module 30' can realize discontinuous movement, and the ratio of the absolute value of the maximum value of the pulse current to the minimum value is at least 1.2 times, adopt 2 times in the present embodiment, and the single pulse width of pulse current is less than 2s, is 1s in the present embodiment. At the first moment, the drive unit supplies an initial current to the coil 7' through the control of the power supply control device, so that the coil 7' and the magnetic component 4' are relatively stationary, and the voltage in the detection coil 7' of the detection feedback unit is divided by the current The value of is maintained as the first relation, namely: U/I=R. Then, the magnitude of the initial current will be gradually increased, so that the coil 7' and the magnetic component 4' will move relative to each other, so that the value of the voltage in the coil 7' divided by the current is the second relationship, that is, U/I>R; detection feedback The unit detects the change of the first relationship of the voltage divided by the current value in the coil 7' to judge that the coil 7' and the magnetic component 4' have relative motion, and obtain the critical condition of the relative motion between the coil 7' and the magnetic component 4'. current value. Wherein, the movement of the lens module 30' is a relative forward or reverse movement relative to the elastic member 9' along the optical axis, and each relative forward or reverse movement has a first movement distance, and the first The movement distance is determined by the radial positive pressure of the elastic component 9', the pulse current in the coil 7', the rate of rise, the waveform width, and the coefficient of friction between the lens module 30' and the elastic component 9'; specifically :

Distance formula for single-step motion

$\mathrm{<span\; class="notranslate">\; S</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; wxya</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; wxya</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; mg</span>}\mathrm{<span\; class="notranslate">\; cos</span>}\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; mg</span>}\mathrm{<span\; class="notranslate">\; cos</span>}\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; \&Delta;<figure-callout\; id="2"\; label="t"\; filenames="DEST\_PATH\_HDA0000449539180000022.png"\; state="\{\{state\}\}">t</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}$

Among them, n is the number of effective coil turns for cutting the magnetic force line, B is the magnetic induction intensity, L is the effective length of a coil, m is the mass of the moving parts, f is the friction force, I _w is the driving current, and θ is the movement of the lens barrel The angle between the direction and gravity, Δt is the square wave pulse width.

Changing one or more of these parameters can change the first movement distance to control the movement of the lens module 30'. the

Please refer to Fig. 4, shown in Fig. 5, in the second embodiment of the present utility model, lens module 30 ' also comprises motion carrier 6 ', lens barrel (not marked), friction member (not marked);

The lens barrel is placed in the moving seat 6', and the moving seat 6' and the lens barrel can be combined into one. The surface is provided with a magnetic component 4', the magnetic component 4' is arranged between the extension parts 61', and is suitable for moving together with the lens module 30'; the position of the sleeve module 20' corresponds to the magnetic component 4', A coil 7 ′ is provided; an elastic member 9 ′ is arranged between the sleeve module 20 ′ and the lens module 30 ′, and the friction member 8 is placed between the extension portion 61 and the elastic member 9 . The camera module also includes: a base 10'. The base 10' is arranged on the imaging module 12' to limit the movement position of the lens module 30' in the optical axis direction. The coil 7' is directly in contact with the power supply end, and the power supply end is a coil 7' provides current. The magnetic component 4' includes two fixed structures. In the first fixed structure, the magnetic component 4' is directly fixedly connected with the extension 61' on the moving carrier 6'; in the second fixed structure, the magnetic component 4' is connected to the moving There is a relative movement distance between the carriers 6' along the optical axis, and the relative movement distance is between 10 microns and 1 millimeter. The control of the power supply control device sends a control signal to the drive unit to provide a corresponding drive signal to the coil 7' of the camera module. In the first fixed structure of the second embodiment, there are two driving modes for the current,

The first driving mode: the coil 7' passes through a current that is consistent with the relative forward direction, causing the magnetic component 4' to directly push the lens module 30' to move;

The second driving method: the coil 7' is fed with a current consistent with the relative reverse direction, so that the lens module 30' stores a certain elastic potential energy, and then fed with a current consistent with the relative forward direction, resulting in a magnetic The component 4' pushes the lens module 30' to move, and is stationary under the action of friction. In the second fixing structure, the current driving method is as follows: first pass a current corresponding to the relative reverse direction to the coil 7', so that the magnetic component 4' stores a certain elastic potential energy, and then pass through the current corresponding to the relatively positive direction. With the electric current in the same direction, the electromagnetic force does positive work, and the magnetic component 4' accumulates kinetic energy and collides with the lens module 30' to push the lens module 30' to move, and is static under the action of friction. the

third embodiment

Please refer to FIG. 6 , FIG. 7A and FIG. 7B . FIG. 6 is a schematic diagram of an exploded structure of a camera module according to a third embodiment of the present invention;

7A and 7B are the front view and the top view along the optical axis direction of the camera module according to the third embodiment of the present invention; it can be seen from the figures that the camera module according to the present invention includes: Module 12 ", sleeve module 20 ", the lens module 30 " that is arranged in the sleeve module 20 " and can correspond to the movement of the sleeve module 20 relative to the direction of the optical axis (this part can refer to the first embodiment, but this embodiment The lens module 30 " in the example is not provided with friction parts), at least one coil 7 " (in this embodiment is a coil), at least one magnetic component 4 " (in this embodiment is a vertical arrangement that can be combined into 2 magnetic components, but not limited thereto), the elastic component 9" arranged between the lens module 30" and the sleeve module 20", wherein, in order to be able to maintain the static state without the need for current in the static state In order to reduce the power consumption of the entire camera module, in the camera module according to the present invention, the elastic part 9 "is snap-connected to the lens module 30", and the elastic part 9 "presses against the lens module 30". 30 "and a conductor 13" between the sleeve module 20", the conductor 13" and the sleeve module 20" are directly or indirectly fixed relatively stationary; the deformation of the elastic member 9" perpendicular to the optical axis direction becomes the lens module 30 "Integrated with the elastic part 9" to apply radial positive pressure to the conductor 13", the elastic part 9" generates friction along the optical axis direction on the contact surface of the conductor 13" and the elastic part 9" through the positive pressure, and the friction force The lens module 30" and the elastic member 9" can be kept in a static state relative to the sleeve module 20" in the direction of the optical axis; and

In this embodiment, the power supply device provides current for the camera module, and is controlled by the power supply control device (as shown in FIG. 8 ) of the imaging module to provide current for the coil 7 ", and the coil 7 " matches the lens module 30 ", The lens module 30" receives an electromagnetic force along the optical axis, and the electromagnetic force serves as a driving force for the lens module 30" to move linearly along the optical axis, so as to drive the lens module 30" to move. the

See also Fig. 6, Fig. 7A and Fig. 7B, Fig. 8, Fig. 9, Fig. 10, Fig. 8 is a schematic diagram of voltage and current signals driven by a voltage source according to the utility model; Fig. 9 is a schematic diagram of a current source driven according to the utility model Fig. 10 is a flow chart of the method for controlling the lens barrel of the camera module for single-step movement according to the utility model. Specifically, the drive unit (not labeled) is controlled by a power supply control device (not labeled) to make the current passed into the coil 7" pulse-like, so that the lens module 30" can realize discontinuous motion, and the maximum pulse current The ratio of the absolute value of the value to the minimum value is at least 1.2 times, 2 times is used in this embodiment, and the single pulse width of the pulse current is less than 2s, 1s in this embodiment. At the first moment, the drive unit supplies an initial current to the coil 7" through the control of the power supply control device, so that the coil 7" and the magnetic component 4" are relatively stationary, and the detection coil 7" of the feedback unit (not marked) The value of voltage divided by current holds the first relationship, ie: U/I=R. Then, the magnitude of the initial current will be gradually increased, so that the coil 7" and the magnetic part 4" will move relative to each other, resulting in the second relationship between the voltage in the coil 7" divided by the current, that is, U/I>R; detection feedback The change in the value of the voltage divided by the current value in the unit detection coil 7" can judge that the coil 7" and the magnetic component 4" have relative motion, and obtain the relative motion of the coil 7" and the magnetic component "4. critical current value. Wherein, the movement of the lens module 30" is a relative forward or reverse movement along the optical axis direction relative to the sleeve module 20" integral with the elastic component 9"; each relative forward or reverse movement has The first movement distance, the first movement distance is composed of the radial positive pressure of the elastic member 9", the pulse current magnitude in the coil 7", the rate of rise, the waveform width, the elastic member 9" and the conductor 13". The coefficient of friction between them is determined; specifically:

Distance formula for single-step motion

$\mathrm{<span\; class="notranslate">\; S</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; wxya</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; wxya</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; mg</span>}\mathrm{<span\; class="notranslate">\; cos</span>}\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; mg</span>}\mathrm{<span\; class="notranslate">\; cos</span>}\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; \&Delta;<figure-callout\; id="2"\; label="t"\; filenames="DEST\_PATH\_HDA0000449539180000022.png"\; state="\{\{state\}\}">t</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}$

Among them, n is the number of turns of the coil, B is the magnetic induction intensity, L is the effective length of a coil, m is the mass of the moving parts, f is the friction force, I _w is the driving current, and θ is the relationship between the moving direction of the lens barrel and the gravity The included angle, Δt is the square wave pulse width.

Changing one or more of the parameters can change the first moving distance to control the movement of the lens module 30 . the

As shown in Fig. 6, Fig. 7A and Fig. 7B, described lens module 30 " can also comprise motion carrier 6 ", lens barrel (not marked in being positioned at motion carrier);

The lens barrel is placed in the moving carrier 6", and the moving carrier 6" and the lens barrel can be combined into one body or formed separately; the moving carrier 6" has several extensions 61" that diverge in the radial direction; the coil 7" Placed in the extension 61", and adapted to move together with the lens module 30". In addition, this embodiment can also be the same as the first embodiment, corresponding to the sleeve module 20", also includes a yoke ring 2 "With the sleeve unit 1" placed inside the yoke ring 2", the sleeve unit 20" protrudes beyond the outer end surface of the yoke ring 2" by more than 0.2mm, and serves as a guide and protection for the lens module 30" The role of the lens module 30". Furthermore, the yoke ring 2" can be equipped with a yoke block 3", and the yoke block 3" is a magnetically conductive material, which plays the role of magnetic conduction for the magnetic component 4"; the yoke block There is an air gap between 3” and the inner wall of the yoke ring 2”, and the coil 7” is placed in the air gap and can move along the direction of the optical axis. More than a third. Wherein, the yoke ring 2", the sleeve unit 1" and the yoke block 3" of the sleeve module 20" are formed integrally or separately. the

The coil 7" is connected to the first conductive part (not marked) on the lens module 30", the first conductive part is in contact with the elastic part 9", and the elastic part 9" is in contact with the power supply end and is suitable for supplying power through the power supply device, and is elastic The component 9" can conduct electricity or have a second conductive part, so that the power supply terminal can provide current to the coil 7" through the elastic part 9" or the conductive part of the elastic part 9". The coil 7" includes two fixed structures. In the first fixed structure, the coil 7" is directly fixedly connected with the extension part 61"; in the second fixed structure, the distance between the coil 7" and the extension part 61" is There is a relative movement distance, and the relative movement distance is between 10 microns and 1 millimeter. The control of the power supply control device sends a control signal to the drive unit and then provides the corresponding drive signal to the coil 7 "of the camera module. In the first fixed structure, There are two driving modes for the current. The first driving mode: the coil 7" is fed with a current consistent with the relative forward direction, which directly pushes the lens module 30" to move; the second driving mode: the coil 7" is fed into the current and The current corresponding to the opposite direction makes the lens module 30" store a certain elastic potential energy and then passes through the current corresponding to the relative forward direction to push the lens module 30" to move and stand still under the action of friction. 

In the second fixed structure, the current driving method is as follows: the coil 7" is fed with a current that is consistent with the relative reverse direction, so that the coil 7" stores a certain elastic potential energy and then is fed with a current that is consistent with the relative forward direction , the electromagnetic force does positive work, the coil 7 "accumulates kinetic energy and collides with the lens module 30" to push the lens module 30" to move, and is static under the action of friction. In addition, the camera module is also provided with a base 10", the base 10" is set on the imaging module 12" to limit the movement position of the lens module 30" in the optical axis direction, and the camera module can also include an infrared filter, which is laid on the image sensor of the imaging module 12". photosensitive side. the

Please refer to the structure of the first embodiment, the second embodiment and the third embodiment, the lens modules 30, 30', 30" have two optical focusing states in the initial optical state, which are respectively:

The first state: the lens module 30, 30 ', 30 " initially has a focusing state for direct imaging of an object at infinity;

The second state: the lens module 30, 30', 30" does not have the focusing state for direct imaging of an object at infinity at the beginning, and the lens module 30, 30', 30" needs to pass through the coil 7, 7', 7" Supply current to adjust the lens module 30 , 30 ′, 30 ″ into the telescopic process of stretching out from the sleeve module 20 ′, and enter into a focusing state for imaging an object at infinity. When in the second state, the lens module 30, 30', 30" completes extending out of the end face of the sleeve module 20, 20', 20" or retracting into the sleeve module 20, 20', 20" in less than 20s In the first state or the second state, the lens modules 30, 30', 30" move discontinuously, and the distance of each continuous movement is not more than 100 microns, realizing the function of searching for the focus position. When the lens module 30, 30', 30" moves relative to the sleeve module 20, 20', 20", the image is output through the imaging module 12, 12', 12", and the image definition is detected. The change of degree determines and matches the first state or the second state, so as to realize the telescoping and/or focusing functions of the lens modules 30, 30', 30". the

In the first embodiment, the second embodiment and the third embodiment, Fig. 8 and Fig. 9 respectively show two different schematic diagrams using a voltage source and a current source respectively. Neglecting the inductance of coils 7, 7', 7", the relationship between the voltage and current at both ends of coils 7, 7', 7" is U=RI+nBLv, where U is the voltage at both ends of coils 7, 7', 7", R Is the resistance value of the coil 7, 7', 7", I is the current value in the coil 7, 7', 7", n is the number of turns of the coil, B is the magnetic induction intensity, L is a turn of the coil 7, 7', 7 "The effective length, v is the coil 7, 7', 7" movement speed. 

According to the formula, as shown in Figure 8, when the voltage source is used, the voltage value U is constant, a. When the coil 7, 7', 7" moves, according to the mechanical principle, the moving speed will first increase and then be constant, so the coil The current I in 7, 7', 7" will first decrease and then become constant; b. When the coil 7, 7', 7" does not move, the current I in the coil 7, 7', 7" is constant. the

As shown in Figure 9, when using a current source, the current value I is constant. U also increases gradually; b. When the coil does not move, the voltage U at both ends of the coil 7, 7', 7" is constant. Thus, the movement of the lens module 30 or 30' can be controlled. 

FIG. 10 shows a flowchart of a method for controlling the lens barrel of the camera module to perform single-step movement according to the present invention. Please refer to Figure 8 and Figure 9 at the same time. During the movement of the lens barrel, the change in the value of the voltage divided by the current in the detection feedback unit detection coil 7, 7', 7" due to the movement of the lens module 30, 30', 30" , and transmit the relevant detection information to the power supply control device, and the power supply control device obtains the critical current value that causes the lens modules 30, 30', 30" to move relative to each other according to the change of this ratio, and provides corresponding control signals to the drive unit, The drive unit provides a drive signal to the camera module, and controls the lens modules 30, 30', 30 "in the camera module to move in the direction of the optical axis synchronously with the coils 7 and 7" in the first embodiment and the third embodiment respectively or in the direction of the optical axis. In the second embodiment, the optical axis moves synchronously with the magnetic component 4', and the lens modules 30, 30', 30" are relatively opposite in the sleeve modules 20, 20', 20" through continuous detection feedback, control calculation, and driving. Forward and reverse movement.

Specifically, the power supply control device passes a pulse current of corresponding magnitude in the coils 7, 7', 7" according to the change of the value of dividing the voltage by the current, so that the electromagnetic force driving the lens modules 30, 30', 30" overcomes the friction Force and other resistance, push the lens barrel to slide relative to the contact surface of the elastic parts 9, 9', 9", and then stop at a certain position under the action of dynamic friction force, that is, the lens module 30 or 30' realizes a step. 

Preferably, one step of the lens module 30, 30', 30", that is, the lens module 30, 30', 30" slides a certain distance relative to the contact surface of the elastic member 9, 9', 9", and the optional lens module 30 . 20" sliding for a certain distance, the distance is determined by the radial elastic force of the elastic parts 9, 9', 9", axial stiffness, electromagnetic force, friction coefficient and other factors, the distance of each step is not greater than 100 microns, and has the ability to Repeatability, so by repeating the above-mentioned stepping process, the positions of the lens modules 30, 30', 30" can be controlled, and the telescopic and/or focusing functions of the camera module can be realized. the

During the stepping process of the lens modules 30, 30', 30", when the lens modules 30, 30', 30" change from motion to relatively stationary with the module, each step is controlled by the electromagnetic driving force. In other words, the lens modules 30, 30', 30" slide a certain distance relative to the contact surfaces of the elastic components 9, 9', 9". the

By means of the control method and the camera module according to the present invention, the optimal control of the camera can be realized, so that this new camera module can make the lens modules 30, 30', 30" extend out of the module, ensuring that the Under the condition that the field of view remains unchanged, the size of the photosensitive chip is increased to improve the image quality. At the same time, its structure is simple, and it can be applied to thin and light electronic devices such as mobile phones and pads. Furthermore, the lens modules 30, 30', 30 "No additional current is required when at rest, which saves power consumption of the camera module, which is especially important for portable devices. the

Other changes to the disclosed embodiments can be understood and effected by those skilled in the art by studying the specification, the disclosure, the drawings and the appended claims. In the actual application of the utility model, one part may perform the functions of multiple technical features cited in the claims. In the claims, the word "comprising" does not exclude other elements and steps, and the word "a" does not exclude a plurality. Any reference signs in the claims should not be construed as limiting the scope. the

Claims (6)

1. A camera module suitable for portable electronic devices, the camera module includes an imaging module, a sleeve module, a lens arranged in the sleeve module that can correspond to the movement of the sleeve module relative to the direction of the optical axis module, characterized in that: The lens module includes at least one ring of light-shielding parts radially protruding from the outer surface of the lens module along the optical axis direction, and the light-shielding part includes a first extending surface along the optical axis direction and a the second extension plane of the first angle; The sleeve module includes a first inner diameter wall and a second inner diameter wall suitable for axial movement of the lens module, the second inner diameter wall protrudes from the first inner diameter wall, and the first inner diameter wall matches the first inner diameter wall An extension surface, the second inner diameter wall is matched with the outer surface of the lens module; a first connection surface is connected between the second inner diameter wall and the first inner diameter wall, and the first connection surface is matched with the second inner diameter wall An extension surface; through the second extension surface and the first connection surface, it is suitable for shielding incident light along the gap between the outer surface of the lens module and the second inner diameter wall of the sleeve module; The sleeve module further includes: at least one air hole penetrating through the outer wall of the sleeve module, which is adapted to reduce the air damping received by the lens module during the movement of the sleeve module. the 2 . The camera module suitable for portable electronic devices according to claim 1 , wherein a filter membrane corresponding to the air holes is provided on the inner side of the outer wall of the sleeve module. 3 . the 3 . A camera module suitable for portable electronic devices according to claim 1 , wherein 3 to 5 lenses are installed in the lens module along the optical axis. 4 . the 4 . A camera module suitable for portable electronic devices according to claim 1 , wherein the width of the camera module is greater than or equal to 7 mm. the 5 . A camera module suitable for portable electronic devices according to claim 1 , wherein the aperture of the vent hole is 0.3 mm˜1 mm. 5 . the 6 . A camera module suitable for portable electronic devices according to claim 1 , wherein the first angle is 30 degrees to 150 degrees. the

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