CN210954457U

CN210954457U - Lens focusing device

Info

Publication number: CN210954457U
Application number: CN201922278830.1U
Authority: CN
Inventors: 刘丽花
Original assignee: Dongguan Yutong Optical Technology Co Ltd
Current assignee: Dongguan Yutong Optical Technology Co Ltd
Priority date: 2019-12-18
Filing date: 2019-12-18
Publication date: 2020-07-07
Anticipated expiration: 2029-12-18

Abstract

The utility model discloses a camera lens focusing device, include: a base; the lens connecting seat is movably arranged on the base; the guide shaft penetrates through the lens connecting seat, and one end of the guide shaft is connected with the base; the motor is arranged on the base, the output end of the motor is connected with a lead screw and can drive the lead screw to rotate, and the length direction of the lead screw is the same as that of the guide shaft; the connecting piece is sleeved on the lead screw and connected with the lens connecting seat, and the connecting piece can reciprocate along the length direction of the lead screw along with the rotation of the lead screw so as to drive the lens connecting seat to reciprocate along the length direction of the guide shaft. The utility model can drive the lens connecting seat to reciprocate along the length direction of the guide shaft by controlling the motor to rotate positively and negatively, thereby achieving the purpose of automatic focusing; lens connecting seat only cooperates with the guiding axle, and the fitting surface between the product is little, consequently guarantees the precision more easily on the mould, has solved the unable balanced problem of cooperation precision between the traditional gear box self-focusing module part.

Description

Lens focusing device

Technical Field

The utility model relates to a camera technical field especially relates to a camera lens focusing device.

Background

With the gradual maturity of the lens industry, the security awareness of the masses of people is improved, the requirements on security lenses in the market are higher and higher, the image plane is evolved from the most advanced 1/4 ″ to the most advanced 1/1.8 ″ or even larger from the original VGA (Video Graphics Array, i.e., Video Graphics Array) to the current 4K lens, the evolution undoubtedly increases a lot of difficulties for the design of an optical system, and under the dual requirements of high pixels and large image planes, the back focus of the lens is sensitive and the back focus length is shortened. In terms of the problem of sensitivity of back focus, the conventional operation of manually rotating the lens to focus through a screw thread connected with the base cannot meet the precision requirement of the optical system, so that a high-precision automatic focusing module is required to realize focusing.

The traditional automatic focusing module adopts a gear box system to achieve the purpose of self focusing, however, although the gear box system has high focusing precision, the automatic focusing module has a certain clearance in the position matching of mechanical dead points at two ends due to the fact that an inner hole matched with a lens connecting seat always has a certain pattern drawing inclination in the production process of the existing mould, the matching precision among parts cannot be balanced, and the problems of shaking and the like are caused by the fact that the bottom can be matched and the end part clearance is larger frequently; or the ends can be fitted and the bottoms are fitted too tightly, resulting in seizure and serious step loss problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a camera lens focusing device, this camera lens focusing device have stronger stability and reliability.

To achieve the purpose, the utility model adopts the following technical proposal:

a lens focusing apparatus, comprising:

a base;

the lens connecting seat is used for connecting a lens and is movably arranged on the base;

the guide shaft penetrates through the lens connecting seat, and one end of the guide shaft is connected with the base; and the number of the first and second groups,

the motor is arranged on the base, the output end of the motor is connected with a lead screw and can drive the lead screw to rotate, and the length direction of the lead screw is the same as that of the guide shaft; the connecting piece can reciprocate along the length direction of the lead screw along with the rotation of the lead screw so as to drive the lens connecting seat to reciprocate along the length direction of the guide shaft.

In some embodiments, the lens focusing device further includes a limiting member for preventing the lens connecting seat from coming off the guide shaft, the limiting member is fixedly connected to the base, and the other end of the guide shaft is connected to the limiting member.

In some embodiments, a through hole is formed in the lens connecting seat, a spring and a steel ball are arranged in the through hole, and the steel ball is abutted to the connecting piece; the length direction of the spring is the same as that of the guide shaft, one end of the spring is connected with the steel ball, and the other end of the spring is abutted against or connected with the limiting piece.

In some embodiments, a blind guiding hole is formed in the limiting member corresponding to the through hole, and the other end of the spring extends into the blind guiding hole.

In some embodiments, the lens connecting holder includes a connecting holder body for connecting the lens and a connecting portion protrudingly connected to the connecting holder body, and the guide shaft is inserted into the connecting portion.

In some embodiments, the base has an accommodating space, the lens connecting seat is at least partially disposed in the accommodating space, a gap is disposed on a sidewall of the accommodating space, and the connecting member is inserted through the gap and connected to the lens connecting seat.

In some embodiments, the lens focusing apparatus further includes a guide bar guiding the connecting member, and a length direction of the guide bar is the same as a length direction of the lead screw.

In some embodiments, the lens focusing apparatus further includes a mounting bracket connected to the base, the motor and the guide bar are disposed on the mounting bracket, and the connecting member is located in the mounting bracket.

In some embodiments, a connection interface for connecting the IR-cut is provided on the base.

In some embodiments, the motor is a stepper motor.

The utility model discloses camera lens focusing device has following beneficial effect at least: the lens connecting seat can be driven to reciprocate along the length direction of the guide shaft by controlling the motor to rotate forwards and backwards, so that the aim of automatic focusing is fulfilled; in the lens focusing device with the structure, the lens connecting seat is only matched with the guide shaft, the matching surface between products is small, so that the precision is easier to guarantee on the die, and the problem that the matching precision between the traditional gearbox self-focusing module parts cannot be balanced is solved.

Drawings

Fig. 1 is a schematic structural diagram of a lens focusing device according to an embodiment of the present invention;

FIG. 2 is a top view of the focusing apparatus of the lens shown in FIG. 1;

FIG. 3 is a schematic structural view of the lens focusing device shown in FIG. 1 after being connected to a lens;

FIG. 4 is an exploded view of the lens focusing device and the lens shown in FIG. 3;

FIG. 5 is a partial schematic structural view of the lens focusing apparatus shown in FIG. 2 with a base omitted;

FIG. 6 is a cross-sectional view of the lens focusing apparatus of FIG. 5 taken along the line A-A;

fig. 7 is a schematic structural diagram of a base according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a lens connection seat according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a driving mechanism according to an embodiment of the present invention;

the reference numbers illustrate:

the lens holder comprises a base 10, an accommodating space 11, a notch 12, a connecting interface 13, a lens connecting seat 20, a connecting seat body 21, a connecting part 22, a guide shaft 30, a motor 41, a lead screw 42, a connecting part 43, a guide rod 44, an installing frame 45, a limiting part 50, a spring 61, steel balls 62, a fastening part 70, a lens 100, a side plate 451 and a connecting plate 452.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

The present embodiment provides a lens focusing device, as shown in fig. 1 to 9, the lens focusing device includes a base 10, a lens connecting holder 20, a guide shaft 30 and a motor 41, wherein the lens connecting holder 20 is used for connecting a lens 100, and the lens connecting holder 20 is movably disposed on the base 10; the guide shaft 30 is used for positioning the lens connecting holder 20 and guiding the movement of the lens connecting holder 20, the guide shaft 30 is arranged in the lens connecting holder 20 in a penetrating way, and one end of the guide shaft 30 is connected with the base 10; the motor 41 is arranged on the base 10, the output end of the motor 41 is connected with the lead screw 42 and can drive the lead screw 42 to rotate, and the length direction of the lead screw 42 is the same as that of the guide shaft 30; the lead screw 42 is sleeved with a connecting piece 43, the connecting piece 43 is connected with the lens connecting seat 20, and the connecting piece 43 can reciprocate along the length direction of the lead screw 42 along with the rotation of the lead screw 42 so as to drive the lens connecting seat 20 to reciprocate along the length direction of the guide shaft 30.

The lens focusing device can drive the lens connecting seat 20 to reciprocate along the length direction of the guide shaft 30 by controlling the motor 41 to rotate positively and negatively, thereby achieving the purpose of automatic focusing; in the lens focusing device with the structure, the lens connecting seat 20 is only matched with the guide shaft 30, and the matching surface between products is small, so that the precision is easier to ensure on a die, and the problem that the matching precision between the self-focusing module parts of the traditional gear box cannot be balanced is solved.

Alternatively, the motor 41 may be a servo motor or a stepping motor, preferably a stepping motor, which can be controlled more precisely.

As shown in fig. 7, in some embodiments, the base 10 is provided with an accommodating space 11, and the lens connecting holder 20 is at least partially disposed in the accommodating space 11, so that the overall occupied space of the lens focusing device can be reduced; the sidewall of the accommodating space 11 is provided with a notch 12, and the connecting member 43 is inserted into the notch 12 and connected to the lens connecting seat 20.

As shown in fig. 7, a connection interface 13 for connecting an IR-cut (i.e. a dual-filter switch) is disposed on the base 10, and the IR-cut is a single body and can be determined whether to be installed according to the use requirement.

In some embodiments, the lens focusing apparatus further includes an IR-cut mounted at the connection interface 13 on the base 10. It can be understood that the thickness of the IR-cut is reduced, so that the IR-cut can be increased when the back focal length of the lens is short, and the back focal space is saved to a great extent.

As shown in fig. 8, in some embodiments, the lens connecting holder 20 includes a connecting holder body 21 for connecting the lens and a connecting portion 22 protrudingly connected to the connecting holder body 21, the guide shaft 30 is inserted into the connecting portion 22, the connecting stability of the lens connecting holder 20 and the lens 100 is ensured by the connecting holder body 21, the connecting portion 22 is not affected by the connecting holder body 21, and thus the connecting portion 22 can be set as small as possible, thereby further reducing the assembling surface of the lens connecting holder 20 and the guide shaft 30.

In the embodiment shown in fig. 8, the number of the connecting portions 22 is two, two connecting portions 22 are oppositely arranged, and the connecting member 43 is connected with one of the connecting portions 22; the number of the guide shafts 30 is also two, and the two guide shafts 30 are correspondingly arranged in the two connecting portions 22 in a penetrating manner and are arranged oppositely, so that the movement stability of the lens connecting seat 20 in the focusing process is improved.

In some embodiments, the lens focusing apparatus further includes a limiting member 50, the limiting member 50 is fixedly connected to the base 10, and the limiting member 50 is connected to the other end of the guide shaft 30, the limiting member 50 can prevent the lens connecting holder 20 from being separated from the guide shaft 30 when the lens connecting holder 20 moves along the length direction of the guide shaft 30, so as to ensure the safety of the lens 100 connected to the lens connecting holder 20. Alternatively, the retaining member 50 and the lens coupling base 20 may be detachably coupled by a fastener 70 (e.g., a screw, a bolt-nut assembly).

In order to solve the problem that the traditional automatic focusing module has a return stroke difference which cannot be eliminated, as shown in fig. 6, the lens focusing device of the utility model is provided with a through hole on the lens connecting seat 20, a spring 61 and a steel ball 62 are arranged in the through hole, and the steel ball 62 is abutted against the connecting piece 43; the length direction of the spring 61 is the same as that of the guide shaft 30, one end of the spring 61 is connected with the steel ball 62, the other end of the spring 61 is abutted against or connected with the limiting piece 50, and the spring 61 always has a thrust force on the connecting piece 43 in the whole process that the lens connecting seat 20 moves along the length direction of the guide shaft 30, so that the problem of return stroke difference is well avoided.

Specifically, after the connecting member 43 is connected to the lens connecting holder 20, a steel ball 62 and a spring 61 are installed in a through hole of the lens connecting holder 20, wherein the steel ball 62 abuts against the connecting member 43, one end of the spring 61 abuts against the steel ball 62, the other end of the spring 61 abuts against the limiting member 50, and the spring 61 always has a thrust force on the connecting member 43 in the whole process of the movement of the lens connecting holder 20 along the length direction of the guide shaft 30, thereby well avoiding the problem of return difference.

In some embodiments, the limiting member 50 is provided with a blind guiding hole corresponding to the through hole, and the other end of the spring 61 extends into the blind guiding hole, so that the blind guiding hole can accommodate a part of the spring 61, thereby guiding the telescopic motion of the spring 61, and the elastic restoring force of the spring 61 is always kept on the same straight line, thereby ensuring the focusing accuracy.

In some embodiments, the lens focusing apparatus further includes a guide rod 44 guiding the link 43, a length direction of the guide rod 44 is the same as a length direction of the lead screw 42, and the guide rod 44 makes the link 43 move more smoothly along the length direction of the lead screw 42, which helps to improve focusing accuracy.

Further, the lens focusing apparatus further includes a mounting bracket 45 connected to the base 10, the motor 41 and the guide bar 44 are disposed on the mounting bracket 45, and the connecting member 43 is located in the mounting bracket 45. The motor 41, the screw rod 42, the guide rod 44, the connecting piece 43 and other parts can be combined into one driving module by designing the mounting frame 45, the driving module is mounted on the base 10 when the lens focusing device is assembled, modular assembly is realized, the assembly and disassembly are more convenient, and the storage and the transportation are also convenient.

Specifically, as shown in fig. 9, the mounting bracket 45 includes two side plates 451 disposed opposite to each other and a connecting plate 452 connecting the two side plates 451, and the connecting plate 452 is detachably connected to the base 10 by a fastener (e.g., a screw, a bolt-nut assembly); the connecting piece 43 is positioned between the two side plates 451, and two ends of the guide rod 44 are respectively connected with the two side plates 451; the motor 41 is mounted on one of the side plates 451, and the side plate 451 is provided with a through hole corresponding to the screw shaft 42, through which the screw shaft 42 passes.

It should be noted that when one portion is referred to as being "secured to" another portion, it may be directly on the other portion or there may be an intervening portion. When a portion is said to be "connected" to another portion, it may be directly connected to the other portion or intervening portions may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A lens focusing apparatus, comprising:

a base (10);

the lens connecting seat (20) is used for connecting a lens (100), and the lens connecting seat (20) is movably arranged on the base (10);

the guide shaft (30) penetrates through the lens connecting seat (20), and one end of the guide shaft (30) is connected with the base (10); and the number of the first and second groups,

the motor (41) is arranged on the base (10), the output end of the motor (41) is connected with a lead screw (42) and can drive the lead screw (42) to rotate, and the length direction of the lead screw (42) is the same as that of the guide shaft (30); the connecting piece (43) is sleeved on the lead screw (42), the connecting piece (43) is connected with the lens connecting seat (20), and the connecting piece (43) can reciprocate along the length direction of the lead screw (42) along with the rotation of the lead screw (42) so as to drive the lens connecting seat (20) to reciprocate along the length direction of the guide shaft (30).

2. The lens focusing device according to claim 1, further comprising a limiting member (50) for preventing the lens connecting base (20) from coming off the guiding shaft (30), wherein the limiting member (50) is fixedly connected to the base (10), and the other end of the guiding shaft (30) is connected to the limiting member (50).

3. The lens focusing device according to claim 2, wherein a through hole is formed in the lens connecting seat (20), a spring (61) and a steel ball (62) are arranged in the through hole, and the steel ball (62) is abutted against the connecting member (43); the length direction of the spring (61) is the same as that of the guide shaft (30), one end of the spring (61) is connected with the steel ball (62), and the other end of the spring is abutted against or connected with the limiting piece (50).

4. The lens focusing device according to claim 3, wherein the limiting member (50) is provided with a blind guiding hole corresponding to the through hole, and the other end of the spring (61) extends into the blind guiding hole.

5. The lens focusing device according to claim 1, wherein the lens connecting holder (20) includes a connecting holder body (21) for connecting the lens and a connecting portion (22) protrudingly connected to the connecting holder body (21), and the guide shaft (30) is inserted into the connecting portion (22).

6. The lens focusing device according to claim 1, wherein the base (10) is provided with an accommodating space (11), the lens connecting seat (20) is at least partially disposed in the accommodating space (11), a notch (12) is disposed on a sidewall of the accommodating space (11), and the connecting member (43) is inserted into the notch (12) and connected to the lens connecting seat (20).

7. The lens focusing apparatus according to claim 1, further comprising a guide bar (44) guiding the connecting member (43), wherein a length direction of the guide bar (44) is the same as a length direction of the lead screw (42).

8. Lens focusing device according to claim 7, characterized in that it further comprises a mounting bracket (45) connected to the base (10), the motor (41) and the guide rod (44) being arranged on the mounting bracket (45), the connecting piece (43) being located in the mounting bracket (45).

9. Lens focusing device according to claim 1, characterized in that the base (10) is provided with a connection interface (13) for connecting an IR-cut.

10. The lens focusing device according to any one of claims 1 to 9, wherein the motor (41) is a stepping motor.