CN209746244U - infrared automatic focusing device - Google Patents

Abstract

The utility model discloses an infrared automatic focusing device, which comprises a fixed base, be equipped with the mounting hole on the fixing base, sliding connection has the camera lens mount pad on the mounting hole, the camera lens mount pad is in axial motion is done in the mounting hole, be equipped with spacing post on the outer wall of camera lens mount pad, be equipped with the guide pillar group that uses with spacing post cooperation on the fixing base, the guide pillar group contains two guide pillars that are parallel to each other, each the guide pillar sets up along the direction of motion of camera lens mount pad, spacing post sliding connection is between two guide pillars, the guide pillar is the cambered surface with the face of spacing post contact. The utility model discloses an infrared automatic focusing device makes the contact of spacing post and guide post group be linear contact, and area of contact is minimum, and the interference volume that effectively less reciprocated avoids the camera lens mount pad the situation that the jamming appears when reciprocating, reduces the camera lens and rocks, and the focusing process is more smooth and easy.

Description

Infrared automatic focusing device

Technical Field

The utility model relates to a camera focusing field, concretely relates to infrared automatic focusing device.

Background

In order to be stable and reduce the shaking of a lens, the conventional automatic focusing device generally adopts a rotating thread to push a lens mounting seat to move axially. When the screw thread is rotated to push the lens mounting base to move, a limiting mechanism must be used to limit the displacement of the lens mounting base in the rotating direction. However, although the existing limiting mechanism has a good limiting effect, the contact area with the lens mounting seat is too large, and the movement of the lens mounting seat is blocked due to too large interference amount during up-and-down movement.

Disclosure of Invention

To the area of contact of above-mentioned among the prior art automatic focusing device's stop gear and camera lens mount pad too big, the interference volume is big, causes the problem of jamming, the utility model provides an infrared automatic focusing device uses the rotation of spacing post and the spacing lens mount pad of guide pillar group limit, effectively reduces area of contact, prevents the jamming.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides an infrared automatic focusing device, includes the fixing base, be equipped with the mounting hole on the fixing base, sliding connection has the camera lens mount pad on the mounting hole, the camera lens mount pad is in axial motion is in the mounting hole, be equipped with spacing post on the outer wall of camera lens mount pad, be equipped with the guide pillar group that uses with spacing post cooperation on the fixing base, guide pillar group contains two guide pillars that are parallel to each other, each the guide pillar sets up along the direction of motion of camera lens mount pad, spacing post sliding connection is between two guide pillars, the guide pillar is the cambered surface with the face of spacing post contact.

the utility model provides a technical scheme that its technical problem adopted further still includes:

The novel lens barrel fixing device is characterized by comprising a fixing base, wherein a mounting hole is formed in the fixing base, a lens mounting base is connected to the mounting hole in a sliding mode, the lens mounting base moves axially in the mounting hole, a limiting column is arranged on the outer wall of the lens mounting base, a guide column group matched with the limiting column is arranged on the fixing base and comprises two guide columns which are parallel to each other, each guide column is arranged along the moving direction of the lens mounting base, the limiting column is connected between the two guide columns in a sliding mode, and the contact surface of the guide columns and the limiting column is a cambered surface.

The utility model has the advantages that: the utility model discloses an infrared automatic focusing device, use the spacing post that sets up on the camera lens mount pad and set up the guide post group cooperation on the fixing base, restriction camera lens mount pad is at the ascending displacement of direction of rotation at the focus regulation in-process, the contact surface of spacing post and guide post group is the cambered surface, make the contact of spacing post and guide post group be linear contact, area of contact is the minimum, effective less interference volume that reciprocates, avoid the camera lens mount pad the situation that the jamming appears when reciprocating, it rocks to reduce the camera lens, the focusing process is more smooth and easy.

The present invention will be further described with reference to the accompanying drawings and the detailed description.

Drawings

Fig. 1 is an exploded schematic view of an embodiment of the infrared automatic focusing apparatus of the present invention;

Fig. 2 is a schematic perspective view of an axial conductive ring in an embodiment of the infrared automatic focusing apparatus of the present invention;

Fig. 3 is a schematic top view of an embodiment of the infrared automatic focusing apparatus of the present invention;

FIG. 4 is a schematic cross-sectional view along AA' of an embodiment of the infrared autofocus device of the present invention;

In the figure, 1, a fixed seat, 11, a guide column group, 111, a guide column, 12, a second internal thread, 2, an axial transmission ring, 21, a transmission toothed belt, 22, a first internal thread, 23, a second external thread, 3, a lens mounting seat, 31, a limiting column, 32, a first external thread, 4, a fixed seat bottom plate, 5, a driving motor, 6 and a transmission gear group.

Detailed Description

The embodiment is a preferred embodiment of the present invention, and other principles and basic structures are the same as or similar to those of the embodiment, and are within the protection scope of the present invention.

the embodiment of the utility model discloses an infrared automatic focusing device embodiment is shown with reference to fig. 1-4, including fixing base 1, be equipped with the mounting hole on the fixing base 1, sliding connection has camera lens mount pad 3 on the mounting hole, and camera lens mount pad 3 is the edgewise up-and-down motion in the mounting hole. The outer wall of the lens mounting base 3 is provided with a limiting column 31, and the limiting column 31 is perpendicular to the tangent plane of the lens mounting base 3 at the position. The fixing base 1 is provided with a guide post group 11 used in cooperation with the limiting post 31, the guide post group 11 includes two guide posts 111 parallel to each other, and each guide post 111 is arranged along the moving direction of the lens mounting base 3. Spacing post 31 sliding connection is between two guide pillars 111, and the face of guide pillar 111 and spacing post 31 contact is the cambered surface for area of contact between spacing post 31 and the guide pillar group 11 is minimum, and the effectual interference volume that reduces when spacing post 31 is concertina movement along with lens mount pad 3 prevents the jamming of lens mount pad 3. In order to make the lens mount pad 3 more steady at the focusing in-process, the spacing post 31 and the guide pillar group 11 of this embodiment are equipped with two sets ofly, and the setting of difference symmetry is on fixing base 1 and lens mount pad 3. Also, in order to make the contact area smaller, the outer shape of the stopper post 31 in the present embodiment is a cylindrical shape.

Referring to fig. 1, the fixing base 1 is installed on the infrared camera at one end, and can be directly sleeved on the infrared camera body in order to match the infrared camera body in a square shape. The other end of the fixed seat 1 is matched with a lens of the infrared camera, and a lens mounting seat 3 capable of adjusting the focal length of the lens is mounted on the fixed seat. In order to fix the lens mounting seat 3 in the fixing seat 1, the fixing seat 1 is provided with a fixing seat bottom plate 4 with the shape matched with the shape, so that parts are prevented from being separated from the fixing seat bottom plate, and the phenomenon that other parts interfere the operation of the focusing device when the infrared automatic focusing device is mounted on a camera is avoided.

The infrared automatic focusing device of this embodiment still includes driving motor 5 that drive lens mount 3 was axial motion, and driving motor 5 is connected with lens mount 3 through drive gear group 6 and axial conducting ring 2. Driving motor 5 fixes the outer wall of fixing base 1 is equipped with the through-hole on fixing base 1, and inside driving motor 5's axis of rotation stretched into fixing base 1 from the through-hole, was connected with drive gear group 6, still installed the power supply circuit board for driving motor 5 power supply on fixing base 1. The transmission gear set 6 is fixed on the fixed seat bottom plate 4 beside the axial transmission ring 2, and a transmission toothed belt 21 meshed with the transmission gear set 6 is arranged on the outer wall of the axial transmission ring 2.

the axial conduction ring 2 of the infrared automatic focusing device of the embodiment is an annular part and is in threaded connection with the lens mounting seat 3, the axial conduction ring 2 is sleeved outside the lens mounting seat 3, and the inner wall of the axial conduction ring is provided with a first internal thread 22. The outer wall of the lens mount 3 is provided with a first external thread 32 that mates with the first internal thread 22. The first internal thread 22 is a multi-start thread, so that the strokes of the internal and external threads can be overlapped, the displacement efficiency of the lens mounting base 3 is improved, in order to meet the focusing requirements of different cameras, the first internal thread 22 can be threads with different numbers of heads, in the embodiment, the first internal thread 22 is an eight-start thread, the displacement speed is high during focusing, and the movement is stable.

The axial conduction ring 2 is connected with the fixed seat 1 through threads, and the axial conduction ring 2 is arranged between the fixed seat 1 and the lens mounting seat 3. The outer wall of the axial transmission ring 2 is provided with a second external thread 23, and the inner wall of the mounting hole of the fixing seat 1 is provided with a second internal thread 12 matched with the second external thread 23. The second internal thread 12 is a single thread, and moves smoothly, thereby reducing the shaking amount of the camera lens.

When the focal length is adjusted, the driving motor 5 rotates, so that the driving gear set 6 rotates. The drive gear set 6 is engaged with the drive toothed belt 21 to transmit power to the axial transmission ring 2, so that the axial transmission ring 2 starts to rotate. The axial transmission ring 2 is respectively connected with the fixed seat 1 and the lens mounting seat 3 through threads, when the axial transmission ring 2 rotates, the second external threads 23 arranged on the outer wall rotate along the second internal threads 12, and the axial transmission ring 2 generates a small amount of displacement in the telescopic direction to drive the lens mounting seat 3 to move; since the displacement of the lens mount 3 in the rotational direction is restricted, when the first internal thread 22 provided on the inner wall rotates, the first external thread 32 and the first internal thread 22 are engaged, pushed by the first internal thread 22, to generate a displacement in the telescopic direction, so that the focal length of the lens is changed.

The utility model discloses an infrared automatic focusing device, use the spacing post that sets up on the camera lens mount pad and set up the guide post group cooperation on the fixing base, restriction camera lens mount pad is at the ascending displacement of direction of rotation at the focus regulation in-process, the contact surface of spacing post and guide post group is the cambered surface, make the contact of spacing post and guide post group be linear contact, area of contact is the minimum, effective less interference volume that reciprocates, avoid the camera lens mount pad the situation that the jamming appears when reciprocating, it rocks to reduce the camera lens, the focusing process is more smooth and easy.

Claims (8)

1. The utility model provides an infrared automatic focusing device, its characterized in that, infrared automatic focusing device includes fixing base (1), be equipped with the mounting hole on fixing base (1), sliding connection has lens mount pad (3) on the mounting hole, lens mount pad (3) are axial motion in the mounting hole, be equipped with spacing post (31) on the outer wall of lens mount pad (3), be equipped with guide post group (11) that use with spacing post (31) cooperation on fixing base (1), guide post group (11) contain two guide pillars (111) that are parallel to each other, each guide pillar (111) set up along the direction of motion of lens mount pad (3), spacing post (31) sliding connection is between two guide pillars (111), the face of guide pillar (111) and spacing post (31) contact is the cambered surface.

2. The infrared autofocus apparatus of claim 1, wherein the spacer (31) has a cylindrical shape.

3. The infrared autofocus apparatus according to claim 1, further comprising a driving motor (5) for driving the lens mount (3) to move axially, wherein the driving motor (5) is connected to the lens mount (3) through a transmission gear set (6) and an axial transmission ring (2).

4. An infrared autofocus device according to claim 3, wherein the axial transmission ring (2) is provided with a transmission toothed belt (21) which meshes with the transmission gear set (6).

5. The infrared automatic focusing device according to claim 3, characterized in that the axial conductive ring (2) is connected with the lens mount (3) by a screw thread, the axial conductive ring (2) is sleeved outside the lens mount (3), the inner wall of the axial conductive ring (2) is provided with a first internal screw thread (22), and the outer wall of the lens mount (3) is provided with a first external screw thread (32) matched with the first internal screw thread (22).

6. The infrared automatic focusing device according to claim 5, characterized in that the axial conductive ring (2) is connected with the fixed base (1) by a screw thread, the axial conductive ring (2) is disposed between the fixed base (1) and the lens mount (3), a second external thread (23) is disposed on an outer wall of the axial conductive ring (2), and a second internal thread (12) engaged with the second external thread (23) is disposed on an inner wall of the mount hole of the fixed base (1).

7. The infrared autofocus apparatus of claim 6, wherein the first internal thread (22) is a multi-start thread and the second external thread (23) is a single-start thread.

8. The infrared autofocus apparatus of claim 7, wherein the first internal thread (22) is an eight-start thread.