Automatic focusing motor with heat dissipation function

Abstract

The utility model relates to the technical field of cameras, and discloses an automatic focusing motor with a heat dissipation function, which comprises a base, a shell is detachably connected onto the base, an accommodating cavity is formed by the base and the inner space of the shell together, an upper elastic sheet, a lower elastic sheet and a carrier are arranged in the accommodating cavity, one end of the carrier is connected onto the shell through the upper elastic sheet, and the other end of the carrier is connected onto the shell through the lower elastic sheet. The other end of the carrier is connected to the base through a lower elastic piece, the inner side face of the shell is fixedly connected with a coil, the carrier is arranged in the coil, the outer side face of the carrier is fixedly connected with a plurality of magnets, the inner side face of the carrier is provided with a lens module, a heat dissipation block is arranged between each magnet and the coil, and the heat dissipation blocks are fixedly connected to the shell. According to the technical scheme of the utility model, the heat dissipation efficiency in the motor can be improved, the temperature in the lens module can be reduced, and the junction temperature of the chip can be effectively prevented from rising.

Description

Technical Field

[0001] The utility model relates to the technical field of cameras, in particular to an autofocus motor with a heat dissipation function. Background Art

[0002] With the continuous development of imaging technology, autofocus motors are widely used in various imaging devices. In particular, the combination of autofocus motors with various portable electronic devices (such as mobile phones, cameras, computers, etc.) is more popular among consumers.

[0003] The existing autofocus motor includes a base, a housing is connected to the base, and the internal spaces of the base and the housing together form a receiving cavity. An upper elastic sheet, a lower elastic sheet and a carrier are arranged in the receiving cavity. One end of the carrier is connected to the housing through the upper elastic sheet, and the other end of the carrier is connected to the base through the lower elastic sheet. A coil is wound around the outer side of the carrier, and a lens module is installed on the inner side surface of the carrier. A plurality of magnets are fixedly connected to the inner side surface of the housing. After the coil is energized, a magnetic force will be generated between the coil and the magnets. Under the action of the magnetic force, the carrier is pushed to move, and then the lens module is driven to move synchronously to achieve the autofocus function. The disadvantage of this technical solution is that since the coil is wound around the outer side surface of the carrier, a large amount of heat will be generated after being energized, and the lens module is installed inside the carrier, which makes the heat dissipation inside the motor relatively slow. In this way, it will inevitably lead to an increase in the temperature inside the motor, and then cause the problem of too high temperature inside the lens module, and at the same time, it will also increase the chip junction temperature. Summary of the Utility Model

[0004] The utility model aims to provide an autofocus motor with a heat dissipation function to improve the heat dissipation efficiency inside the motor. At the same time, it can also reduce the temperature inside the lens module and effectively prevent the chip junction temperature from rising.

[0005] To achieve the above object, the utility model adopts the following technical scheme: An autofocus motor with a heat dissipation function includes a base, a housing is detachably connected to the base, and the internal spaces of the base and the housing together form a receiving cavity. An upper elastic sheet, a lower elastic sheet and a carrier are arranged in the receiving cavity. One end of the carrier is connected to the housing through the upper elastic sheet, and the other end of the carrier is connected to the base through the lower elastic sheet. A coil is fixedly connected to the inner side surface of the housing, the carrier is arranged inside the coil, a plurality of magnets are fixedly connected to the outer side surface of the carrier, a lens module is installed on the inner side surface of the carrier, and a heat dissipation block is arranged between each magnet and the coil. The heat dissipation block is fixedly connected to the housing.

[0006] The beneficial effect of this scheme is that when the autofocus motor works, after the coil is energized, a magnetic force will be generated between the coil and the magnets. Under the action of the magnetic force, the carrier is pushed to move, and then the lens module is driven to move synchronously to achieve the autofocus function.

[0007] In this technical solution, since the magnet is fixed on the carrier and the coil is fixed on the housing, a large amount of heat will be generated after the coil is energized. This heat can be dissipated into the surrounding air through the housing, thereby reducing the temperature inside the motor. In addition, by arranging heat dissipation blocks between the magnet and the coil, the heat generated between the coil and the magnet can quickly pass through the heat dissipation blocks and be transferred to the housing, and then be transferred from the housing to the surrounding air by the housing, greatly improving the heat dissipation efficiency inside the motor. In this way, not only the temperature inside the lens module is reduced, but also the chip junction temperature rise can be effectively prevented.

[0008] Furthermore, each heat dissipation block includes a first heat dissipation part, a second heat dissipation part, and a third heat dissipation part that are connected in sequence. The second heat dissipation part is located between the magnet and the coil and can contact the magnet and the coil. Both the first heat dissipation part and the third heat dissipation part are fixedly connected to the housing and can contact the upper and lower sides of the coil.

[0009] The beneficial effect of this solution is that in this technical solution, the second heat dissipation part is arranged between the magnet and the coil, which can fully absorb the heat on the surfaces of the coil and the magnet. Subsequently, the heat is quickly transferred to the surrounding air through the housing, effectively avoiding excessive local heat accumulation and greatly improving the heat dissipation efficiency inside the motor.

[0010] In addition, in this technical solution, the first heat dissipation part and the third heat dissipation part are in contact with the upper and lower sides of the coil, further expanding the heat dissipation contact area. The heat dissipated by the coil can be received from multiple directions, thus significantly improving the heat transfer efficiency. At the same time, both the first heat dissipation part and the third heat dissipation part are fixedly connected to the housing, and the heat absorbed can be quickly transferred to the housing, and the housing can then dissipate the heat into the surrounding air, thereby forming an efficient heat dissipation channel.

[0011] Furthermore, the material of the heat dissipation block is epoxy resin.

[0012] The beneficial effect of this solution is that since the heat dissipation coefficient of epoxy resin is greater than that of air, in this technical solution, the material of the heat dissipation block is set as epoxy resin, so that the heat inside the motor can be quickly transferred to the housing through the heat dissipation block and then be transferred from the housing to the surrounding air by the housing, greatly improving the heat dissipation efficiency inside the motor.

[0013] Furthermore, the housing is an iron shell.

[0014] The beneficial effect of this solution is that in this technical solution, by setting the housing as an iron shell, on the one hand, the hardness of the housing is ensured, and the housing can be effectively prevented from deforming under the action of various external forces, thus realizing the protection of its internal components; on the other hand, iron has good thermal conductivity, which enables the iron shell to quickly conduct the heat generated inside and achieve the function of rapid heat dissipation.

[0015] Further, the number of magnets is four, and the four magnets are symmetrically arranged on the outer side surface of the carrier.

[0016] The beneficial effects of this solution are as follows: In this technical solution, four magnets are symmetrically arranged on the outer side surface of the carrier, which can make the generated magnetic field more uniform and stable. When the autofocus motor works, the movement of the carrier is more stable and accurate, which helps to improve the accuracy and speed of autofocus and ensure that the lens module can quickly and accurately focus on the target object. At the same time, it can also reduce problems such as uneven force on the coil and unstable movement caused by uneven magnetic field, reduce the vibration and noise of the motor during operation, and improve the user experience of the device. In addition, it can also reduce the stress impact on other components and reduce the probability of component damage or failure caused by unbalanced force. For example, the symmetric magnetic force distribution can reduce the uneven pulling on the upper elastic piece and the lower elastic piece and extend the service life of the upper elastic piece and the lower elastic piece.

[0017] Further, the outer side surface of the carrier is in the shape of a regular polygon, and the number of sides of the outer side surface of the carrier is greater than the number of magnets.

[0018] The beneficial effects of this solution are as follows: In this technical solution, the outer side surface of the carrier is set in the shape of a regular polygon, and it is ensured that the number of sides of the outer side surface of the carrier is greater than the number of magnets. The advantages of this setting are: on the one hand, it is convenient for the flexible layout and installation of the magnets. The magnets can be set at different side positions according to actual needs, making the installation of the magnets more reasonable and efficient, and providing more possibilities for optimizing the performance of the autofocus motor. On the other hand, in the parts where no magnets are set, the gap between the carrier and the coil can be increased. This is conducive to the rapid dissipation of heat inside the motor, avoiding excessive accumulation of heat inside the motor, thereby reducing the temperature inside the motor, improving the working stability and service life of the motor, and also helping to prevent adverse effects on other components due to excessive temperature. Description of the Drawings

[0019] Figure 1 is a three-dimensional view of an autofocus motor with a heat dissipation function according to the present invention;

[0020] Figure 2 is an exploded view of an autofocus motor with a heat dissipation function according to the present invention;

[0021] Figure 3 is a three-dimensional view of the heat dissipation block of the present invention. Detailed Description of the Invention

[0022] The following is a more detailed description through specific embodiments:

[0023] The reference numerals in the accompanying drawings of the specification include: base 1, housing 2, upper elastic piece 3, lower elastic piece 4, carrier 5, coil 6, magnet 7, heat dissipation block 8, first heat dissipation part 9, second heat dissipation part 10, and third heat dissipation part 11.

[0024] Embodiment

[0025] As Figure 1 shown, an autofocus motor with a heat dissipation function includes a base 1 and a housing 2, and the housing 2 is an iron shell.

[0026] As Figure 2 shown, the housing 2 is snap - connected to the base 1, and the internal spaces of the base 1 and the housing 2 together form a receiving cavity. An upper elastic piece 3, a lower elastic piece 4, and a carrier 5 are arranged in the receiving cavity. The top of the carrier 5 is connected to the housing 2 through the upper elastic piece 3, and the bottom of the carrier 5 is connected to the base 1 through the lower elastic piece 4. A coil 6 is adhesively bonded to the inner side surface of the housing 2. The carrier 5 is arranged inside the coil 6. Four magnets 7 are provided on the outer side surface of the carrier 5, and the four magnets 7 are symmetrically distributed along the circumferential direction of the outer side surface of the carrier 5. The connection manner between the magnet 7 and the carrier 5 can be adhesive bonding or snap - connection. In this embodiment, the connection manner between the magnet 7 and the carrier 5 is adhesive bonding; a lens module is installed on the inner side surface of the carrier 5. Each magnet 7 and the coil 6 are provided with a heat dissipation block 8, and the heat dissipation block 8 is adhesively bonded to the housing 2. The material of the heat dissipation block 8 is epoxy resin. The outer side surface of the carrier 5 is in the shape of a regular octagon, and the number of sides of the outer side surface of the carrier 5 is greater than the number of magnets 7.

[0027] As Figure 3 shown, each heat dissipation block 8 includes a first heat dissipation part 9, a second heat dissipation part 10, and a third heat dissipation part 11, and the first heat dissipation part 9, the second heat dissipation part 10, and the third heat dissipation part 11 are integrally formed. The second heat dissipation part 10 is located between the magnet 7 and the coil 6. The front side surface of the second heat dissipation part 10 can contact the coil 6, and the rear side surface of the second heat dissipation part 10 can contact the magnet 7. The setting of the second heat dissipation part 10 can fully absorb the heat on the surfaces of the coil 6 and the magnet 7. Subsequently, the heat is quickly transferred to the surrounding air through the housing 2, effectively avoiding the excessive accumulation of heat in a local area and greatly improving the heat dissipation efficiency inside the motor. The front side surfaces of the first heat dissipation part 9 and the third heat dissipation part 11 are both adhesively bonded to the inner side surface of the housing 2, and both the first heat dissipation part 9 and the third heat dissipation part 11 can contact the upper and lower side surfaces of the coil 6. The settings of the first heat dissipation part 9 and the third heat dissipation part 11 further expand the heat dissipation contact area, can receive the heat dissipated by the coil 6 from multiple directions, thereby significantly improving the heat transfer efficiency. At the same time, both the first heat dissipation part 9 and the third heat dissipation part 11 are adhesively bonded to the housing 2, can quickly transfer the absorbed heat to the housing 2, and the housing 2 can then dissipate the heat to the surrounding air, thus forming an efficient heat dissipation channel.

[0028] The specific implementation process is as follows:

[0029] When the autofocus motor is working, after the coil 6 is energized, a magnetic force will be generated between the coil 6 and the magnet 7. Under the action of the magnetic force, the carrier 5 is pushed to move, and then the lens module is driven to move synchronously, so as to realize the autofocus function.

[0030] In this technical solution, the magnet 7 is fixed on the carrier 5, and the coil 6 is fixed on the housing 2. After the coil 6 is energized, a large amount of heat will be generated, and this heat can be dissipated into the surrounding air through the housing 2, thereby reducing the temperature inside the motor. In addition, by arranging a heat dissipation block 8 between the magnet 7 and the coil 6, the heat generated between the coil 6 and the magnet 7 can quickly pass through the heat dissipation block 8 and be transferred to the housing 2, and then be transferred from the housing 2 to the surrounding air by the housing 2, greatly improving the heat dissipation efficiency inside the motor. In this way, not only the temperature inside the lens module is reduced, but also the increase of the chip junction temperature can be effectively prevented.

[0031] The above are only the embodiments of the present utility model. Specific technical solutions and / or common knowledge such as characteristics well known in the art are not described in detail herein. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present utility model, several deformations and improvements can still be made, and these should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicability of the patent. The protection scope required by this application should be subject to the content of its claims, and the specific implementation manners described in the specification can be used to explain the content of the claims.

Claims

1. An autofocus motor with a heat dissipation function, characterized in that: It includes a base, on which a housing is detachably connected. The internal spaces of the base and the housing together form a receiving cavity. An upper elastic sheet, a lower elastic sheet and a carrier are arranged in the receiving cavity. One end of the carrier is connected to the housing through the upper elastic sheet, and the other end of the carrier is connected to the base through the lower elastic sheet. A coil is fixedly connected to the inner side surface of the housing. The carrier is arranged inside the coil. A plurality of magnets are fixedly connected to the outer side surface of the carrier. A lens module is installed on the inner side surface of the carrier. A heat dissipation block is arranged between each magnet and the coil, and the heat dissipation block is fixedly connected to the housing.

2. The autofocus motor with a heat dissipation function according to claim 1, wherein: Each heat dissipation block includes a first heat dissipation part, a second heat dissipation part and a third heat dissipation part which are connected in sequence. The second heat dissipation part is located between the magnet and the coil and can contact the magnet and the coil. The first heat dissipation part and the third heat dissipation part are both fixedly connected to the housing and can contact the upper and lower side surfaces of the coil.

3. The autofocus motor with a heat dissipation function according to claim 2, characterized in that: The material of the heat dissipation block is epoxy resin.

4. The autofocus motor with a heat dissipation function according to claim 3, wherein: The housing is an iron shell.

5. The autofocus motor with a heat dissipation function according to claim 4, wherein: The number of magnets is four, and the four magnets are symmetrically arranged on the outer side surface of the carrier.

6. The autofocus motor with a heat dissipation function according to claim 5, wherein: The outer side surface of the carrier is in a regular polygon shape, and the number of sides of the outer side surface of the carrier is greater than the number of magnets.

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