CN216411700U

CN216411700U - Automatic focusing device

Info

Publication number: CN216411700U
Application number: CN202122825128.XU
Authority: CN
Inventors: 温之云; 李迎春
Original assignee: Jiangsu Konsung Biomedical Technology Co ltd
Current assignee: Jiangsu Konsung Biomedical Technology Co ltd
Priority date: 2021-11-18
Filing date: 2021-11-18
Publication date: 2022-04-29
Anticipated expiration: 2031-11-18

Abstract

An automatic focusing device comprises a CMOS module, a detection base, a motor, a lens cone, a transmission device and an anti-shake device, wherein the CMOS module is arranged at the upper end of the detection base, the motor is arranged on the detection base, the transmission device, the lens cone and the anti-shake device are arranged inside the detection base, the anti-shake mechanism is connected with the lens cone, the transmission device is connected with the motor and the lens cone, high-precision, smooth and stable linear focusing of the lens cone is guaranteed through the cooperation of gear transmission and an upper ratchet wheel and a lower ratchet wheel, and shaking of the lens cone is prevented through the anti-shake device.

Description

Automatic focusing device

Technical Field

The utility model relates to the field of optical focusing, in particular to an automatic focusing device.

Background

The focusing device is an indispensable component in an optical system, and the focusing device realizes the linear motion of the lens barrel through manually or electrically rotating a focusing ring on the lens, so that the focusing function of the lens is realized. Focusing of industrial and commercial lenses is generally achieved by a cylindrical cam sleeve, and linear movement of a lens barrel is achieved by rotation of the cylindrical cam sleeve relative to the lens barrel, thereby achieving a focusing function. The cylindrical cam sleeve is rotated in two modes, namely electric mode and manual mode. The electric focusing needs to process structures such as gears on the cylindrical cam sleeve and the like to be matched with a motor; the electric focusing device with the existing cam structure has the following technical problems:

1. the rotation precision is poor;

2. the lens cone shakes greatly, and the existing anti-shake device is large in size.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an automatic focusing device, which realizes a high-precision, smooth and stable linear focusing function and simultaneously meets the requirements of an optical system on focusing precision and anti-jitter.

In order to achieve the above object, the present invention is realized by the following technical solutions:

an automatic focusing device comprises a CMOS module, a detection base, a motor, a lens cone, a transmission device and an anti-shake device, wherein the CMOS module is arranged at the upper end of the detection base, the motor is arranged on the detection base, the transmission device, the lens cone and the anti-shake device are arranged inside the detection base, the anti-shake device is connected with the lens cone, and the transmission device is connected with the motor and the lens cone.

Furthermore, the transmission device comprises a lower ratchet wheel, an upper ratchet wheel, a homing plate, a magnet, a large gear and a small gear.

Furthermore, the anti-shake device comprises a spring, a detection bracket and an elastic sheet.

Furthermore, the upper ratchet wheel is arranged on the detection base, and the lower ratchet wheel is fixed with the large gear.

Further, the small gear is arranged on the motor, and the large gear is arranged between the upper ratchet wheel and the lower ratchet wheel and meshed with the small gear.

Further, the magnet is arranged on the large gear.

Furthermore, the homing plate is arranged on the detection base, and a Hall sensor is arranged on the homing plate, is matched with the magnet and is converted into output voltage ground change according to the magnetic field ground change so as to control the rotating speed of the motor.

Furthermore, an upper ratchet wheel concave-convex profile is arranged on the upper ratchet wheel, a lower ratchet wheel concave-convex profile is arranged on the lower ratchet wheel, the upper ratchet wheel concave-convex profile is matched with the lower ratchet wheel concave-convex profile, and linear focusing of the lens barrel is achieved through rotation of the lower ratchet wheel.

Further, the detection support is arranged at the bottom of the detection base, and the lens cone is sleeved on the detection base and the detection support.

Furthermore, the spring is sleeved on the lens barrel, the elastic sheet is arranged on the detection base, and the spring presses the lens barrel to prevent the lens barrel from shaking.

Through the technical scheme, the utility model has the following beneficial effects:

1. the upper ratchet wheel, the lower ratchet wheel, the detection base, the lens cone and the detection support are all precision parts, and high-precision, smooth and stable linear focusing of the lens cone is guaranteed through gear transmission and matching between the upper ratchet wheel and the lower ratchet wheel.

2. The lens barrel is pressed by the spring to prevent the lens barrel from shaking.

Drawings

FIG. 1 is a cross-sectional view of the present invention;

FIG. 2 is an exploded view of the present invention;

fig. 3 is a schematic diagram of a homing plate structure of the utility model;

FIG. 4 is a schematic view of the upper ratchet structure of the present invention;

FIG. 5 is a schematic view of the lower ratchet structure of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

The utility model provides a technical scheme that: an automatic focusing device comprises a CMOS module 1, a detection base 2, a motor 3, a lens cone 4, a transmission device 5 and an anti-shake device 6, wherein the CMOS module 1 is arranged at the upper end of the detection base 2, the motor 3 is arranged on the detection base 2, the transmission device 5, the lens cone 4 and the anti-shake device 6 are arranged inside the detection base 2, the anti-shake device 6 is connected with the lens cone 4, and the transmission device 5 is connected with the motor 3 and the lens cone 4.

The transmission device 5 comprises a lower ratchet wheel 51, an upper ratchet wheel 52, a reset plate 53, a magnet 54, a large gear 55 and a small gear 56, the anti-shake device 6 comprises a spring 61, a detection support 62 and an elastic sheet 63, the upper ratchet wheel 52 is arranged on the detection base 2, the lower ratchet wheel 51 is fixed with the large gear 55, the small gear 56 is arranged on the motor 3, the large gear 55 is arranged between the upper ratchet wheel 52 and the lower ratchet wheel 51 and meshed with the small gear 56, the magnet 54 is arranged on the large gear 55, the reset plate 53 is arranged on the detection base 2, and the reset plate 53 is provided with a Hall sensor 57.

The upper ratchet wheel 52 is provided with an upper ratchet wheel concave-convex profile 520, the lower ratchet wheel 51 is provided with a lower ratchet wheel concave-convex profile 510, the upper ratchet wheel concave-convex profile 520 is matched with the lower ratchet wheel concave-convex profile 510, the detection support 62 is arranged at the bottom of the detection base 2, the lens barrel 4 is sleeved on the detection base 2 and the detection support 62, the spring 61 is sleeved on the lens barrel 4, and the elastic piece 63 is arranged on the detection base 2.

The working principle of the embodiment is as follows: the pinion 56 on the motor 3 drives the lower ratchet wheel 51 on the large gear 55 to rotate, the concave-convex profile 510 of the lower ratchet wheel 51, which is uniformly distributed, extrudes the concave-convex profile 520 of the upper ratchet wheel 52, which is uniformly distributed, so as to drive the lens barrel 4 to realize focusing, and the spring 61 presses the lens barrel 4 to prevent the lens barrel 4 from shaking.

Claims

1. An automatic focusing device, characterized in that: the device comprises a CMOS module (1), a detection base (2), a motor (3), a lens cone (4), a transmission device (5) and an anti-shaking device (6), wherein the CMOS module (1) is arranged at the upper end of the detection base (2), the motor (3) is arranged on the detection base (2), the transmission device (5), the lens cone (4) and the anti-shaking device (6) are arranged inside the detection base (2), the anti-shaking device (6) is connected with the lens cone (4), and the transmission device (5) is connected with the motor (3) and the lens cone (4).

2. An autofocus apparatus according to claim 1, wherein: the transmission device (5) comprises a lower ratchet wheel (51), an upper ratchet wheel (52), a homing plate (53), a magnet (54), a large gear (55) and a small gear (56).

3. An autofocus apparatus according to claim 1, wherein: the anti-shake device (6) comprises a spring (61), a detection support (62) and an elastic sheet (63).

4. An autofocus apparatus according to claim 2, wherein: the upper ratchet wheel (52) is arranged on the detection base (2), and the lower ratchet wheel (51) is fixed with the large gear (55).

5. An autofocus apparatus according to claim 2, wherein: the small gear (56) is arranged on the motor (3), and the large gear (55) is arranged between the upper ratchet wheel (52) and the lower ratchet wheel (51) and meshed with the small gear (56).

6. An autofocus apparatus according to claim 2, wherein: the magnet (54) is arranged on the gearwheel (55).

7. An autofocus apparatus according to claim 2, wherein: the resetting plate (53) is arranged on the detection base (2), and the resetting plate (53) is provided with a Hall sensor (57).

8. An autofocus apparatus according to claim 2, wherein: an upper ratchet wheel concave-convex profile (520) is arranged on the upper ratchet wheel (52), a lower ratchet wheel concave-convex profile (510) is arranged on the lower ratchet wheel (51), and the upper ratchet wheel concave-convex profile (520) is matched with the lower ratchet wheel concave-convex profile (510).

9. An autofocus apparatus according to claim 3, wherein: the detection support (62) is arranged at the bottom of the detection base (2), and the lens cone (4) is sleeved on the detection base (2) and the detection support (62).

10. An autofocus apparatus according to claim 3, wherein: the spring (61) is sleeved on the lens cone (4), and the elastic sheet (63) is arranged on the detection base (2).