TWI410691B - Lens structure in a miniature lens driving mechanism and method of manufacturing the lens structure - Google Patents

Abstract

Disclosed is a lens structure for lens driving apparatus, including a lens unit composed of a cylindrical lens and a bearing seat, said lens unit is composed of at least one lens and a lens support member, wherein no thread structure is provided between the lens and lens support member, the outer periphery side of the lens is adhered onto the inner peripheral edge of the support member with a binding agent; the support bearing seat is in the shape of hollow cylinder, the cylindrical lens may be received therein, also no thread structure between the cylindrical lens and the support bearing seat, the outer periphery side of the cylindrical lens is adhered onto the inner peripheral edge of the support bearing seat with a binding agent, so as to eliminate volume occupied by the thread structure to miniaturize the structure , such that the problem of contact friction wearing generated by the thread structure can be solved.

Description

Lens structure of micro lens driving device and manufacturing method thereof

The invention relates to a lens structure of a micro lens driving device and a manufacturing method thereof, in particular to a lens unit with a screwless structure and a manufacturing method thereof, which can specifically reduce the structure of the lens and have fine adjustment of the tilt of the lens during the manufacturing process. Focusing effect.

Press, the micro lens drive device mainly drives the focus lens to move linearly along the optical axis direction to focus the image light on the image sensor, and has been widely used in electronic devices with photos or photography functions, such as mobile phones. And the micro lens driving device has a plurality of related driving modes, for example, the patent application document: Japanese Patent Application No. 2008-129597, which claims priority to the Chinese Patent Application No. 200610157001.2, which discloses a stepping motor driving lens The structure of focusing, by means of the threaded structure on the stator set and the rotor, drives the lens to move the focus up and down.

The conventional patent has the functions of fine-tuning and autofocusing the lens, and the protective layer formed by the lens and the rotor is also fixed by screwing. Locking the lens through the thread will make the thread structure occupy a certain volume, and when the lens has a tilt angle with respect to the image sensor, the focus will be out of focus, but it is limited by the thread structure. The level of the tilt angle is fine-tuned so that the lens forms a defective product.

Moreover, due to the thread structure, the fine adjustment of the lens and the action of the autofocus will rotate in contact with each other to generate a small amount of friction loss, which will not only consume more power, but also produce a small "squeaking" sound, so that the quality cannot be improved.

At the job, the inventor of the present invention focused on the lack of the above-mentioned existing micro lens driving device, and devoted himself to the application of the theory, and proposed a thread structure in which the lens is replaced by a bonding agent, which not only reduces the volume occupied by the thread structure. The utility model can be further miniaturized, and can solve the contact friction loss generated by the thread structure, and the tilt adjustment of the lens relative to the image sensor can be performed step by step in the process, without being limited by the thread structure and reducing defective products. The micro lens driver is improved in quality.

The object of the present invention is to provide a lens structure of a lens driving device and a manufacturing method thereof, which is a lens unit with a screwless structure, the lens unit can linearly move along the optical axis direction, and focus the image light on an image sensor. (Sensor), the structure of the lens unit can be made smaller, and the problems caused by the thread structure can be solved.

Therefore, the main technical feature of the present invention is to provide a lens unit structure consisting of a lens cylinder (Lens Barrel) and a carrier (Barrel Holder), wherein the lens cylinder can be supported by at least one lens and a lens. The component has a threadless structure between the lens and the lens support member, and the adhesive is adhered to the outer peripheral side of the lens on the inner peripheral surface of the lens support member; the carrier is hollowed out and can accommodate the lens circle The cylinder has a threaded structure between the lens cylinder and the carrier, and the outer circumference of the lens cylinder is adhesively fixed to the inner circumference of the carrier by an adhesive.

The lens driving device of the present embodiment includes a carrier 20 for carrying a lens cylinder 10, which is housed in a lens. In the frame 60 of the hollow structure, the frame 60 is further covered with an upper cover 61. The periphery of the carrier 20 is covered with a coil component 62, and four permanent magnets 63 are disposed outside the coil component 62 corresponding to the coil component 62. A plurality of elastic members 64 are connected to the upper and lower sides of the carrier 20 to support the carrier 20 in the center of the frame 60, and an image sensor 30 is disposed under the frame 60.

The coil element 62 can conduct current through the lower elastic element 64 to cause the coil element 62 to generate an electromagnetic field, and generate a pushing force with the four permanent magnets 63, and is limited by the elastic element 64 to be pinned, so that the carrier 20 can be The upper and lower linear displacement activities are generated in the frame 60, so that light entering from the lens cylinder 10 on the carrier 20 can be focused on the image sensor 30.

Referring to FIG. 2A, it is a side cross-sectional view of a first embodiment of a lens unit without a threaded structure according to the present invention, and FIG. 2B is a top cross-sectional view of the first embodiment. As can be seen from the foregoing description, the lens driving device drives a lens unit (Lens Unit) 1 to perform linear movement in the optical axis direction, so that the image light entering the lens unit 1 is automatically focused on an image sensor 30, and the present invention is the most The main purpose is to design a lens unit 1 with a screwless structure and a manufacturing method of the lens unit 1. The lens unit 1 is composed of a lens cylinder 10 and a barrel holder 20 .

The lens cylinder 10 is further composed of at least one lens (Lens) 11 and a lens support member (Lens Brace) 12. As can be seen from the embodiment of FIG. 2A, it is composed of two lenses 11 and a cylindrical lens. The support member 12 is composed of a non-thread-locking structure between the lens 11 and the lens support member 12, and the outer peripheral portion of the lens support member 12 is adhered to the inner peripheral surface of the lens support member 12 by an adhesive.

The carrier 20 is in the form of a hollow cylinder, and the lens cylinder 10 can be accommodated, and a gap 21 is formed between the outer periphery of the lens support 12 and the inner circumference of the carrier 20, as shown in FIG. 2B. The gap 21 may be filled with a bonding agent such that the inner peripheral surface of the carrier 20 and the outer periphery of the lens barrel 10 are adhered to each other, and the lens cylinder 10 and the carrier 20 are adhered by an adhesive. During the process, the tilt adjustment and focus adjustment with respect to the image sensor 30 can be performed step by step.

The light-incident side of the carrier 20 is further provided with at least one connecting member 22, which can be connected to the elastic member 64, so that the carrier 20 can maintain linear displacement in the optical axis direction. A groove 23 is formed between the connecting member 22 and the carrier 20, and excess bonding agent can be accumulated in the groove 23.

The outer circumference of the carrier 20 may cover the coil element 62 or may cover the magnetic element. Preferably, the outer circumference of the carrier 20 may be circular, or may be square, octagonal or other polygonal.

Referring to FIG. 3, it is a schematic diagram of a manufacturing process of a first embodiment of a lens unit without a threaded structure according to the present invention. First, at least one lens 11 is placed in the lens support 12 (S100), and the lens 11 is bonded by a bonding agent. The outer peripheral side is adhesively fixed to the inner peripheral surface of the lens support member 12 (S110) to form a lens cylinder 10, and then the lens cylinder 10 is placed in the carrier 20 (S120), and the bonding agent is injected into the lens support member. 12 is formed in the gap 21 formed between the carrier 20 (S130), and then the tilt and focus position of the lens cylinder 10 are gradually finely adjusted (S140), and the lens cylinder 10 is fixed to the carrier after waiting for the bonding agent to harden. Within 20 (S150).

Alternatively, after the lens cylinder 10 is completed, the bonding agent may be injected into the inner peripheral surface of the carrier 20 (S125), and then the lens cylinder 10 is placed in the carrier 20 (S135), and then gradually The tilt and focus position of the lens barrel 10 are adjusted (S140), and after the bonding agent is hardened, the lens barrel 10 is fixed in the lens holder 20 (S150).

Referring to FIG. 4A, it is a side cross-sectional view of a second embodiment of a lens unit having a threadless structure according to the present invention, and FIG. 4B is a top cross-sectional view of the second embodiment. The second embodiment of the present invention uses a simple lens object as the lens cylinder 10, and the lens support member is omitted to make the lens structure smaller. Therefore, the lens unit 2 includes a lens cylinder 40 and a carrier 50. The carrier 50 is in the form of a hollow cylinder, and the lens cylinder 40 can be accommodated therein. The lens cylinder 40 and the carrier 50 have no thread structure. The outer circumference of the lens cylinder 40 and the carrier 50 A gap 51 is formed between the inner circumferences. As shown in FIG. 4B, the gap 51 can be filled with a bonding agent so that the lens cylinder 40 can be adhesively fixed in the carrier 50.

Similarly, when the lens cylinder 40 is adhered to the lens holder 40 by the bonding agent, the tilt adjustment and the focus adjustment with respect to the image sensor 30 can be performed step by step. The light-incident side of the carrier 50 is further connected with a connecting member 52, which can be connected to the elastic member 64, so that the carrier 50 can maintain linear displacement in the optical axis direction.

As shown in FIG. 5, it is a schematic diagram of the manufacturing process of the second embodiment of the lens unit of the unthreaded structure of the present invention. First, the lens cylinder 40 is placed in the carrier 50 (S220), and then the bonding agent is injected into the lens cylinder. 40 and the gap 51 formed between the carrier 50 (S230), and then gradually adjust the tilt and focus position of the lens cylinder 40 (S240), the lens cylinder 40 is fixed to the carrier after the bonding agent is hardened. Within 50 (S250).

Alternatively, the bonding agent may be first injected into the inner peripheral surface of the carrier 50 (S225), and then the lens cylinder 40 is placed in the carrier 50 (S235), and then the tilt and focus of the lens cylinder 40 are gradually adjusted slightly. At the position (S240), after the bonding agent is hardened, the lens cylinder 40 is fixed in the carrier 50 (S250).

[Invention Features and Advantages]

Therefore, the lens unit of the screwless structure of the present invention and the method of manufacturing the same have the following features:

1. Since the lens cylinder and the carrier of the present invention are not screw-locked, the volume occupied by the screw can be subtracted, and the lens driving device can be made more compact.

2. Due to the non-threaded structure, the problem of deformation of the elastic movable member caused by the conventional screwing can be solved, and the squeaking sound of the screwing and squeezing lens unit is not generated.

3. The tilt adjustment and focus adjustment of the lens cylinder can be made in the process without being limited by the thread structure.

4. The present invention can produce a lens cylinder from a lens and a lens holder to save the cost of purchasing a ready-made lens object as a lens cylinder.

The present invention is capable of providing a design that is quite different from the prior art by the above-mentioned disclosed technology, which can improve the overall use value, and is not found in the publication or public use before the application, and has already met the requirements of the invention patent. , 提出 filed an invention patent application in accordance with the law.

However, the drawings and descriptions disclosed above are only examples of the present invention, and those skilled in the art can make various other modifications according to the above description, and these changes still belong to the inventive spirit of the present invention. The scope of the patents defined below.

1. . . Lens unit

10. . . Lens cylinder

11. . . lens

12. . . Lens support

20. . . Carrier

twenty one. . . gap

twenty two. . . Connector

twenty three. . . Trench

30. . . Image sensor

2. . . Lens unit

40. . . Lens cylinder

50. . . Carrier

51. . . gap

52. . . Connector

60. . . frame

61. . . Upper cover

62. . . Coil element

63. . . permanent magnet

64. . . Elastic component

1 is a perspective view of an embodiment of a lens driving device of the present invention.

Figure 2A is a side cross-sectional view showing the first embodiment of the lens unit of the non-threaded structure of the present invention.

Figure 2B is a top plan view of the first embodiment of the present invention.

FIG. 3 is a schematic view showing the manufacturing process of the first embodiment of the lens unit without a threaded structure of the present invention.

Figure 4A is a side cross-sectional view showing a second embodiment of the lens unit of the unthreaded structure of the present invention.

Figure 4B is a top plan view of a second embodiment of the present invention.

Figure 5 is a schematic view showing the manufacturing process of the second embodiment of the lens unit of the non-threaded structure of the present invention.

1. . . Lens unit

10. . . Lens cylinder

11. . . lens

12. . . Lens support

20. . . Carrier

twenty one. . . gap

twenty two. . . Connector

30. . . Image sensor

Claims (9)

The lens structure of the lens driving device comprises at least one lens unit (Lens unit) linearly moving along the optical axis direction, and focusing the image light on an image sensor, wherein the lens unit is composed of at least one lens circle a cylinder (Lens Barrel) and a carrier (Barrel Holder), wherein the carrier has a hollow cylindrical shape, and the lens cylinder is disposed, and the lens cylinder and the carrier have no thread structure, but The bonding agent fixes the outer circumference of the lens cylinder to the inner circumference of the bearing seat; wherein a gap is formed between the outer circumference of the lens cylinder and the inner circumference of the bearing seat, and the gap is filled with the bonding agent; wherein the lens is round The cylinder is tilted and adjusted in focus with respect to the image sensor during the process of bonding the adhesive to the carrier. The lens structure of the lens driving device of claim 1, wherein the lens cylinder is composed of at least one lens (Lens) and a lens support (Lens Brace). The lens structure of the lens driving device according to claim 1, wherein the lens cylinder is composed of a simple lens object. The lens structure of the lens driving device according to claim 2, wherein a gap is formed between the outer edge side of the lens and the inner periphery of the lens support, and the gap is filled with a bonding agent to adhere the outer periphery of the lens. On the inner peripheral surface of the lens support. The lens structure of the lens driving device of claim 1, further comprising at least one connecting member for connecting the carrier to the at least one elastic member of the lens driving device. Lens unit manufacturing method for lens driving device, the lens sheet The Lens Unit moves linearly in the direction of the optical axis, and focuses the image light on an image sensor, which comprises: preparing a lens cylinder (Lens Barrel); preparing a hollow cylinder a holder (Barrel Holder) for accommodating the lens cylinder; and bonding the lens cylinder to the carrier with an adhesive; wherein the step of attaching the lens cylinder to the carrier is performed step by step Tilt adjustment and focus adjustment relative to the image sensor. . The lens unit manufacturing method of the lens driving device of claim 6, wherein the step of preparing a lens cylinder further comprises: preparing at least one lens (Lens); preparing a cylindrical lens support Lens Brace; and inserting the lens into the lens support, and bonding the outer peripheral side edge of the lens to the inner peripheral surface of the lens support with an adhesive. The lens unit manufacturing method of the lens driving device of claim 6, wherein the step of bonding the lens cylinder with the bonding agent further comprises: inserting the lens cylinder into the carrier; and injecting the bonding agent into the lens circle The gap between the cylinder and the carrier; adjusting the tilting and focusing state of the lens cylinder; and waiting for the bonding agent to harden and fix the lens cylinder in the carrier. The lens unit manufacturing method of the lens driving device according to claim 6, wherein the step of bonding the lens cylinder with the bonding agent The method further includes: injecting a bonding agent on an inner peripheral surface of the carrier; placing the lens cylinder in the carrier; adjusting the tilting and focusing state of the lens cylinder; and waiting for the bonding agent to harden and fixing the lens cylinder in the carrier .