CN109445233B

CN109445233B - Anti-shake structure of large-focus long-stroke lens

Info

Publication number: CN109445233B
Application number: CN201811621261.XA
Authority: CN
Inventors: 罗荣彬; 邱盛平; 李昆; 李中杰; 谭穗静
Original assignee: Union Optech Co Ltd
Current assignee: Union Optech Co Ltd
Priority date: 2018-12-28
Filing date: 2018-12-28
Publication date: 2023-07-14
Anticipated expiration: 2038-12-28
Also published as: CN109445233A

Abstract

The invention discloses an anti-shake structure of a large-focus long-stroke lens, which comprises a lens group, a guide mechanism and a screw-nut pair for driving the lens group to move along the guide mechanism, wherein the lens group comprises a flange, a screw rod of the screw-nut pair is connected with an external driving device, a transmission nut of the screw-nut pair is arranged at the lower side of the flange, a connecting seat is arranged on the transmission nut, the connecting seat is connected with the flange through at least one connecting rod, a first through hole penetrating up and down is arranged on the flange, and a gap exists between the upper part of the connecting rod and the side wall of the first through hole. The invention can effectively limit the vibration on the transmission nut to be transmitted to the lens group, so that the zooming and zooming processes of the lens group become more stable, and the shaking problem of the large-focus long-stroke lens in the zooming process is improved.

Description

Anti-shake structure of large-focus long-stroke lens

Technical Field

The invention relates to the technical field of anti-shake of lenses, in particular to an anti-shake structure of a large-focal-length long-stroke lens.

Background

When a large-focus long-stroke lens, such as a forest fire prevention lens, is used for focusing or multiplying power adjusting, the lens is driven to move by a screw-nut pair. In the large-focus long-stroke lens appearing in the current market, the lens group is rigidly connected with a screw rod or a nut of a screw rod nut pair, and in the focusing process, vibration can be generated due to rotation of a motor and transmitted to a machine head group along the screw rod nut pair, so that the lens group shakes in the shooting process, and the shooting quality is reduced.

Disclosure of Invention

In view of the above, an object of the present invention is to provide an anti-shake structure of a large focal length long-stroke lens capable of restricting transmission of vibration of a motor to a lens group.

The invention adopts the technical proposal for solving the technical problems that:

the utility model provides an anti-shake structure of long stroke camera lens of large focal length, includes lens group, guiding mechanism and is used for the drive the lens group is vice along the screw-nut of guiding mechanism removal, the lens group includes a flange, screw-nut vice screw rod is connected with outside drive arrangement, screw-nut vice drive nut sets up the downside of flange, be provided with the connecting seat on the drive nut, the connecting seat is in the same place through at least one connecting rod with the flange, be provided with the first through-hole that runs through from top to bottom on the flange, the upper portion of connecting rod passes first through-hole and with the lateral wall of first through-hole between have the clearance.

Preferably, the connecting seat is provided with a second through hole penetrating up and down, and a gap exists between the lower part of the connecting rod and the side wall of the second through hole and penetrates through the second through hole.

Preferably, the upper end of the connecting rod is provided with a first limiting table capable of limiting the separation of the flange and the connecting rod, the lower end of the connecting rod is provided with a second limiting table capable of limiting the separation of the connecting seat and the connecting rod, and when the transmission nut is clung to the lower surface of the flange, the distance between the first limiting table and the second limiting table is larger than the distance between the upper surface of the flange and the lower surface of the connecting seat.

Preferably, the guide mechanism comprises a guide post passing through the flange and slidably engaging the flange.

The beneficial effects of the invention are as follows: the invention can effectively limit the vibration on the transmission nut to be transmitted to the lens group, so that the zooming and zooming processes of the lens group become more stable, and the shaking problem of the large-focus long-stroke lens in the zooming process is improved.

Drawings

FIG. 1 is a perspective view of one view of the present invention;

FIG. 2 is a perspective view of another view of the present invention;

FIG. 3 is a front elevational view, partially in section, of the inventive belt;

fig. 4 is a partial enlarged view of a portion a in fig. 3.

Detailed Description

The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

Referring to fig. 1, an embodiment of the present invention provides an anti-shake structure of a large focal length long-stroke lens, including a lens group 1, a guide mechanism, and a screw-nut pair for driving the lens group 1 to move along the guide mechanism, where the lens group 1 includes a lens 11 and a flange 12, a screw 21 of the screw-nut pair is connected to an external driving device, a driving nut 22 of the screw-nut pair is disposed at a lower side of the flange 12, a connection seat 221 is disposed on the driving nut 22, the connection seat 221 is connected to the flange 12 through at least one connection rod 3, a first through hole 121 penetrating up and down is disposed on the flange 12, and a gap exists between an upper portion of the connection rod 3 and a side wall of the first through hole 121 to enable the connection rod 3 to radially move relative to the flange 12. When the vibration generated by the motor is transmitted to the connecting rod 3 through the screw-nut pair, the connecting rod 3 is driven to vibrate, the vibration amount is mainly radial vibration, but because the space of radial motion of the connecting rod 3 relative to the flange 12 is provided for the gap between the connecting rod 3 and the flange 12, the vibration of the connecting rod 3 in the radial direction can not be transmitted to the lens group 1 any more, the zooming process of the lens group 1 becomes more stable, and the shaking problem of the large-focus long-stroke lens in the zooming process is solved.

As a further improvement of the present invention, the connecting seat 221 is provided with a second through hole 222 penetrating up and down, and the lower portion of the connecting rod 3 passes through the second through hole 222 and has a gap with a sidewall of the second through hole 222 so that the connecting rod 3 can radially move with respect to the connecting seat 221. This structure allows a space for radial movement of the lower portion of the connecting rod 3, further limiting the transmission of vibrations on the connection mount 221 to the lens group 1.

Further, the upper end of the connecting rod 3 is provided with a first limiting table 31 capable of limiting the separation of the flange 12 from the connecting rod 3, the lower end of the connecting rod 3 is provided with a second limiting table 32 capable of limiting the separation of the connecting seat 221 from the connecting rod 3, and when the transmission nut 22 is tightly attached to the lower surface of the flange 12, the distance between the first limiting table 31 and the second limiting table 32 is greater than the distance between the upper surface of the flange 12 and the lower surface of the connecting seat 221, so that the connecting rod 3 can axially move relative to the transmission nut 22 and the flange 12. In this embodiment, the connecting seat 221 is located at the upper end of the driving nut 22, and the distance between the upper surface of the flange 12 and the lower surface of the connecting seat 221 is the sum of the thickness of the flange 12 and the thickness of the connecting seat 221. The design not only gives the space for radial movement of the nut and the connecting rod 3, but also gives the space for axial movement of the nut and the connecting rod 3, and can effectively limit the vibration on the transmission nut 22 and the connecting rod 3 to be transmitted to the flange 12, thereby avoiding resonance of the lens 11 and ensuring the stability of the lens group 1 in the zooming process.

Preferably, the guiding mechanism comprises a guide post 4 penetrating through the flange 12 and in sliding fit with the flange 12, and the guide post 4 can guide and radially position the lens group 1, and can further improve the anti-shake effect by combining the structure for limiting shake transmission.

The above is only a preferred embodiment of the present invention, and the technical solutions for achieving the object of the present invention by substantially the same means are all within the scope of protection of the present invention.

Claims

1. The utility model provides an anti-shake structure of long stroke camera lens of large focal length, includes lens group (1), guiding mechanism and is used for driving lens group (1) is along the screw-nut pair of guiding mechanism removal, characterized in that, lens group (1) include a flange (12), screw-nut pair's lead screw (21) are connected with outside drive arrangement, screw-nut pair's drive nut (22) set up in the downside of flange (12), be provided with connecting seat (221) on drive nut (22), connecting seat (221) are in the same place through at least one connecting rod (3) with flange (12), be provided with first through-hole (121) that run through from top to bottom on flange (12), the upper portion of connecting rod (3) pass first through-hole (121) and with the lateral wall between first through-hole (121) clearance;

a second through hole (222) penetrating up and down is formed in the connecting seat (221), and the lower part of the connecting rod (3) penetrates through the second through hole (222) and a gap exists between the lower part of the connecting rod and the side wall of the second through hole (222);

the upper end of connecting rod (3) is provided with first spacing platform (31) that can restrict flange (12) and connecting rod (3) and break away from, the lower extreme of connecting rod (3) is provided with second spacing platform (32) that can restrict connecting seat (221) and connecting rod (3) and break away from, when drive nut (22) are hugged closely on flange (12) lower surface, the distance between first spacing platform (31) and second spacing platform (32) is greater than the distance between the upper surface of flange (12) and connecting seat (221) lower surface.

2. The anti-shake structure of a large focal length long-stroke lens according to claim 1, wherein the guide mechanism comprises a guide post (4) penetrating the flange (12) and slidably engaged with the flange (12).