CN201166726Y - A camera module capable of auto-focusing - Google Patents

Abstract

The utility model belongs to the technical field of the pickup device, and particularly relates to a pick-up head module capable of automatic focusing. The pick-up head module comprises a base assembly, a lens amounting assembly and an electromagnetic driving device. The base assembly includes a hollow casing, and a base disposed below the casing. The electromagnetic driving device is accommodated in the space formed between the base and the casing interior, and includes a coil, a vertically telescopic flexible element and a magnetic element. The coil is disposed on the base. The magnetic element is disposed above the coil. The lens amounting assembly includes a lens base capable of extending out of the upper end surface of the casing, and the lens base is disposed above the magnetic element. The flexible element is disposed between the coil and the magnetic element. By adopting the structure, a reversed space is obviated, the structure of the magnetic element is simplified, and the height of the pick-up head module is also effectively reduced.

Description

A camera module capable of auto-focusing

technical field

The utility model belongs to the technical field of camera equipment, in particular to an automatic focusing camera module.

Background technique

With the continuous development of technology, camera products have become well-known daily necessities, and have been gradually applied to small communication devices such as mobile phones. In camera equipment, the camera module is one of the most important components. Traditional camera modules mostly use fixed focal length or manual focus when capturing images. These products will bring some inconvenience to some extent.

In recent years, some products have begun to adopt automatic focusing technology. From a structural point of view, the auto-focusing camera modules used in these products are roughly divided into two types: one is to enclose the coil and the magnetic element one by one, and then match them on the top or/and bottom. Elastic element, this structure is suitable for the application of large-size auto-focusing modules; the other is to stack coils and magnetic elements, and the elastic element is placed at the top or bottom, this structure is suitable for the application of small-sized modules .

Accompanying drawing 1 discloses an automatic focusing camera module, which includes a coil 41 , a magnetic element 42 , a shrapnel 43 , a lens holder 44 , a base 46 and a casing 45 . The housing 45 is disposed above the base 46 , and the lens mount 44 is disposed inside the housing 45 and can protrude from the outer surface of the housing 45 . The coil 41 is fixed on the base 46 , the top end of the magnetic element 42 is fixed on the lens holder 44 , and the bottom end is in contact with the top end of the coil 41 . The elastic piece 43 is placed between the magnetic element 42 and the lens holder 44, and the elastic piece 43 includes an inner ring and an outer ring, wherein the inner ring is fixed on the lens holder 44, and the outer ring is fixed on the shell 45, between the magnetic element 42 and the lens The seat 44 leaves a distance S. When working, electrifying the coil 41 generates electromagnetic force and interacts with the magnetic element 42 to drive the lens holder 44 to move up and down to achieve the purpose of focusing.

In this product, the elastic piece 43 is placed between the magnetic element 42 and the lens holder 44. When working, the magnetic element 42 needs to move up and down together with the lens holder 44, and the distance between the two is constant, while the elastic piece 43 is moving In this case, it is necessary to reserve a certain space for the elastic element in the moving direction of the lens (see Figure 1) to ensure that the elastic element will not interfered with. Since a certain height of space is reserved, it will be difficult to reduce the height of the module, resulting in complex auto-focus structure and large size, especially when this product is applied to mobile phones, which are very narrow in space. , the problem is more prominent.

Utility model content

The technical problem to be solved by the utility model is to provide an automatic focusing camera module, which has a simple structure and effectively reduces the height of the camera lens module.

In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is:

A camera module capable of auto-focusing is provided, which includes a base assembly, a lens mounting assembly and an electromagnetic drive device, wherein the base assembly includes a hollow shell and a base, the base is arranged below the shell, and the electromagnetic drive device Accommodated in the space formed by the base and the shell, the electromagnetic drive device includes a coil, an elastic element that can be stretched up and down and a magnetic element, the coil is arranged on the base, the magnetic element is arranged above the coil, and the lens mounting assembly includes an extendable The lens holder on the upper end surface of the housing is arranged above the magnetic element, and the elastic element is arranged between the coil and the magnetic element.

After adopting such a structure, the elastic element is placed between the coil and the magnetic element. When the magnetic element pushes the lens holder to move, the coil is fixed on the base, and the space created by the separation of the coil and the magnetic element is sufficient to solve the problem. The problem of the drop between the inner and outer rings of the elastic element. Compared with the prior art, the reserved space is omitted, which not only simplifies the structure of the magnetic element, but also effectively reduces the height of the camera lens module.

Description of drawings

Fig. 1 is the structural representation of the initial state of a kind of autofocus camera lens module that prior art provides;

Fig. 2 is the structural representation of the initial state of a preferred embodiment provided by the utility model;

Fig. 3 is a schematic structural view of the state in which the lens holder in Fig. 2 protrudes from the upper end shell;

Fig. 4 is a schematic diagram of the exploded structure of Fig. 2;

Fig. 5 is a partial structural schematic diagram of a preferred embodiment provided by the utility model;

Fig. 6 is a schematic diagram of the assembly of the electromagnetic drive device and the base in a preferred embodiment provided by the present invention.

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

A preferred embodiment shown in Fig. 2 to Fig. 6 includes a base component, a lens mounting component and an electromagnetic driving device.

The base assembly includes a hollow shell and a base 11 , the base 11 is arranged below the shell, and the electromagnetic driving device is accommodated in the space formed by the base 11 and the inside of the shell. The electromagnetic drive device includes a coil 31 , an elastic element 32 that can be stretched up and down, and a magnetic element 33 . The coil 31 is arranged on the base 11 , and the magnetic element 33 is arranged above the coil 31 . The lens mounting assembly includes a lens seat 21 that can protrude from the upper surface of the casing, the lens seat 21 is disposed above the magnetic element 33 , and the elastic element 32 is disposed between the coil 31 and the magnetic element 33 . During specific implementation, a coil accommodating cavity 113 and a wire placement groove 111 can be provided on the base 11, the aforementioned coil 31 can be fixed in the coil accommodating cavity 113, and the wire placement groove 111 can accommodate wires for energizing the coil 31; The magnetic element 33 can be a magnetic element itself, preferably a permanent magnet; the coil 31 must adopt a coil 31 structure that can generate electromagnetic force after electrification, such as a copper coil.

The elastic element 32 is placed between the coil 31 and the magnetic element 33. When the magnetic element 33 pushes the lens holder 21 to move, the coil 31 is fixed on the base and does not move, so the space created by the separation of the coil 31 and the magnetic element 33 It is sufficient to solve the problem of the drop between the inner and outer rings of the elastic element 32 . Compared with the prior art, the reserved space is omitted, which not only simplifies the structure of the magnetic element 33, but also effectively reduces the height of the camera lens module.

As a further improvement of the aforementioned technical solution, the aforementioned electromagnetic drive device may also include an iron core 34, as shown in FIGS. Its two ends are respectively fixed on the base 11 and the lens mount 21 . Specifically, referring to shown in Figure 4, the iron core 34 is a cylindrical structure, and its material can be selected from various materials that are easily magnetized and easily demagnetized in the prior art, preferably iron-nickel soft magnetic alloy (permalloy ). In this way, during operation, the iron core 34 will be magnetized by the magnetic element 33, and the cooperation of the two can make the transmission of magnetic force more effective.

The elastic element 32 can adopt the product provided by the prior art, that is, an element that has elasticity itself and can return to its original shape without relying on external force after the shape changes, such as a spring. In this embodiment, the elastic element 32 includes an inner ring 322 and an outer ring 323 , the inner ring 322 is fixed on the iron core 34 , and the outer ring 323 is fixed on the base 11 . When the coil 31 and the magnetic element 33 repel each other to generate thrust, since the coil 31 is fixed on the base 11, the magnetic element 33 and the iron core 34 will drive the inner ring 322 of the elastic element 32 to move upward (see FIG. 3 ). Specifically, four positioning holes 321 are provided at the corners around the elastic element 32, and corresponding positioning posts 112 are provided on the base 11, and the elastic element 32 is fixed with the base 11 through the four positioning holes 321 and the positioning posts 112 , The inner ring 322 of the elastic element 32 is provided with a through hole 324 , the elastic element 32 is fitted and fixed on the iron core 34 through the through hole 324 .

Specifically, the aforementioned shell may include an upper shell 13 and a middle shell 12 , the upper shell 13 is arranged on the upper part of the middle shell 12 , and the lens mount 21 is set inside the upper shell 13 . When working, the lens holder 21 can protrude from the upper end shell 13 under the push of the magnetic element 33 . As a further improvement of the aforementioned technical solution, the lens mounting assembly may also include a dustproof case 22, which is attached to the inner surface of the upper end case 13, and the lens holder 21 is arranged in the dustproof case 22, so that The dustproof case 22 can play the role of dustproof. Further, the above-mentioned upper end cover has a square structure, one end surface has a square concave hole, and a through hole is provided in the middle, and a positioning structure is arranged on the concave hole, which is convenient to cooperate and fix with the dustproof case 22. The upper end surface of the upper end is provided with the process groove that matches with the middle shell 12; The middle shell 12 is a square hollow structure, and there is a wire protection plate 121 on the side corresponding to the wire placement groove 111 of the aforementioned base 11.

Referring to FIG. 4 , a guide block 211 is provided on the outer surface of the lens mount 21 , and a guide wall 221 matching the aforementioned guide block 211 is provided on the inner surface of the dustproof case 22 . In this way, when the thrust produced by the coil 31, the iron core 34 and the magnetic element 33 and the elastic force of the elastic element 32 act together, the lens mount 21 moves up and down in the upper end shell 13, and the guide block 211 on the lens mount 21 will be in contact with the dustproof The guide wall 221 on the inner side of the housing 22 cooperates with each other to play a guiding role, effectively avoiding the eccentricity and vibration of the lens assembled on the lens holder 21 and the photoreceptor of the camera during the movement process, and improving the accuracy of focusing. Specifically, the lens holder 21 in this embodiment is in the shape of a stepped ring, the aforementioned guide block 211 is arranged at the ring with the largest diameter, and the inner wall of the lens holder 21 is an internal thread structure.

The working process of this embodiment is: when the coil 31 is powered by the hard board circuit, the generated magnetic field repels the magnetic field generated by the magnetic element 33, and the thrust generated by the magnetic element 32 and the elastic force generated by the elastic element 32 can push the magnetic element 33 And the movement of the lens holder 21 (the lens is assembled on the lens holder 21), and by adjusting the current and voltage of the coil 31, the movement distance of the lens holder 21 can be controlled, and it can be positioned at a suitable position of the focal length. Simultaneously, when the magnetic element 33 and the lens holder 21 move, the guide plate 211 on the lens holder 21 and the guide wall 221 on the dustproof case 22 will cooperate to play a guiding role, avoiding the lens holder 21 from producing eccentricity and vibration.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (9)

1. A camera module capable of automatic focusing, which includes a base assembly, a lens mounting assembly and an electromagnetic drive device, wherein the base assembly includes a hollow shell and a base, the base is arranged below the shell, and the electromagnetic drive device All are accommodated in the space formed inside the base and the shell. The electromagnetic drive device includes a coil, an elastic element that can be stretched up and down, and a magnetic element. The coil is arranged on the base, and the magnetic element is arranged above the coil. The lens mounting assembly includes a The lens holder protruding from the upper end surface of the housing is arranged above the magnetic element, and the feature is that the elastic element is arranged between the coil and the magnetic element. 2. The camera module capable of auto-focusing according to claim 1, characterized in that: the electromagnetic drive device further includes an iron core, and the iron core is passed through the magnetic element, the elastic element and the coil , and its two ends are respectively fixed on the base and the lens holder. 3. The camera module capable of auto-focusing according to claim 2, wherein the elastic element includes an inner ring and an outer ring, the inner ring is fixed on the iron core, and the The outer ring is fixed on the base. 4. The camera module capable of auto-focusing according to claim 1, wherein the housing includes an upper housing and a middle housing, the upper housing is arranged on the upper part of the middle housing, and the lens holder is arranged on the middle housing. Inside the upper shell. 5. The camera module capable of auto-focusing according to claim 4, characterized in that: the lens mounting assembly further includes a dustproof case, and the dustproof case is attached to the inner surface of the upper end case , the lens holder is arranged in the dustproof case. 6. The camera module capable of auto-focusing according to claim 5, wherein a guide block is provided on the outer surface of the lens holder, and a guide block is provided on the inner surface of the dustproof case. Matching guide walls. 7. The camera module capable of auto-focusing according to claim 1, characterized in that: the base is provided with a coil accommodating cavity, and the coil is arranged in the coil accommodating cavity. 8. The camera module capable of auto-focusing according to any one of claims 1-7, wherein the magnetic element is a permanent magnet. 9. The camera module capable of auto-focusing according to claim 2, characterized in that: the iron core is made of iron-nickel soft magnetic alloy.

Images