CN219370100U - Focusing structure and imaging device - Google Patents

Abstract

The utility model discloses a focusing structure and an imaging device, wherein the focusing structure comprises a fixed tube, a cam ring and a lens group, the cam ring is rotatably sleeved in the fixed tube, at least one driving chute extending along the front and back directions is formed on the peripheral wall of the cam ring and is obliquely arranged along the circumferential direction of the cam ring, a first bulge matched with the driving chute is arranged on the peripheral side of the lens group, and when the cam ring rotates relative to the fixed tube, the driving chute drives the first bulge to drive the lens group to move forwards and backwards. The cam ring is annular structure, can guarantee in the machining precision, and the cam ring cover is located in the fixed tube, and the mirror group also installs in the fixed tube, avoids the entering of external impurity, sets up on the cam ring with first protruding matched with drive chute, only need rotate the cam ring, just can drive the mirror group and move around, realizes focusing, and the mirror group does not directly rotate to avoid the eccentric to change along with the rotation, appear the problem that the resolution power corresponds not, in order to provide a focusing structure that can realize high accuracy and high stability focusing.

Description

Focusing structure and imaging device

Technical Field

The present utility model relates to the field of optical technologies, and in particular, to a focusing structure and an imaging device.

Background

At present, a cam structure is generally used for realizing group movement of an ultra-short focal lens, and a cam is generally arranged outside a fixed cylinder in an external mode; however, due to the structure of the ultra-short focal lens, the cam is arranged outside the fixed cylinder, the corresponding structural strength is weak, the dustproof effect is poor, the external cam is not a complete circle, most of the external cam is half, and the machining precision is difficult to ensure.

In order to ensure the processing precision, CAM grooves of the CAM are also formed on the fixed cylinder, so that the precision can be ensured, but the problem is that the group moves back and forth in the fixed cylinder and is provided with rotary motion, the rotary motion can cause the eccentric core of the lens to change along with the rotation, and the problem that the resolution is not corresponding easily occurs.

Disclosure of Invention

The utility model mainly aims to provide a focusing structure and an imaging device, and aims to provide a focusing structure capable of realizing high-precision and high-stability focusing.

In order to achieve the above object, the present utility model provides a focusing structure, wherein the focusing structure includes:

the fixed cylinder extends along the front and back directions;

the cam ring is rotatably sleeved in the fixed cylinder, at least one driving chute is formed on the peripheral wall of the cam ring, extends in the front-back direction and is obliquely arranged along the circumferential direction of the cam ring; the method comprises the steps of,

the lens group is movably arranged in the fixed cylinder along the front and back directions, a first bulge matched with the driving chute is arranged on the periphery of the lens group, and when the cam ring rotates relative to the fixed cylinder, the driving chute drives the first bulge to drive the lens group to move front and back.

Optionally, the inner wall of the fixed cylinder is provided with a straight groove extending along the front-back direction;

the periphery of the lens group is provided with a guide protrusion matched with the straight groove, and when the cam ring rotates relative to the fixed cylinder, the guide protrusion moves along the straight groove.

Optionally, the driving chute is provided in plurality, and the driving chute is arranged at intervals along the circumferential direction of the cam ring;

the first protrusions are arranged in a plurality, and each first protrusion is matched with a corresponding driving chute.

Optionally, a first threaded hole is formed in the peripheral wall of the lens group;

the first boss comprises the first shaft sleeve, and the first shaft sleeve is fixed with the first threaded hole through a first screw.

Optionally, the driving chute is provided with three, and the first protrusion is correspondingly provided with three.

Optionally, the Zhou Biguan of the fixed cylinder is provided with an adjusting groove extending along the circumferential direction of the fixed cylinder;

the outer peripheral wall of the cam ring is provided with a second protrusion in a protruding mode, and the second protrusion is movably arranged along the adjusting groove.

Optionally, a plurality of adjusting grooves are formed, and the adjusting grooves are arranged at intervals along the circumferential direction of the fixed cylinder;

the second protrusions are arranged in a plurality, and each second protrusion is matched with a corresponding adjusting groove.

Optionally, the focusing structure further comprises a fixing ring and a fixing piece, wherein a limiting hole and a yielding groove are arranged on the fixing ring at intervals, the limiting hole is used for the second bulge to penetrate and locate, and the yielding groove extends along the circumferential direction of the fixing ring;

the fixed cylinder is provided with a positioning hole which is arranged corresponding to the abdication groove;

the fixing ring is movably arranged on the periphery of the fixing barrel along the circumferential direction of the fixing barrel, so that the second protrusion penetrating into the limiting hole can drive the cam ring to rotate, and the fixing piece is used for penetrating into the yielding groove to be fixedly matched with the positioning hole so as to fix the fixing ring to the fixing barrel.

Optionally, a second threaded hole is provided on the outer peripheral wall of the cam ring;

the second protrusion comprises a second sleeve, and the second sleeve is fixed with the second threaded hole through a second screw.

The present utility model also provides an imaging apparatus including a focusing structure including:

the fixed cylinder extends along the front and back directions;

the cam ring is rotatably sleeved in the fixed cylinder, at least one driving chute is formed on the peripheral wall of the cam ring, extends in the front-back direction and is obliquely arranged along the circumferential direction of the cam ring; the method comprises the steps of,

the lens group is movably arranged in the fixed cylinder along the front and back directions, a first bulge matched with the driving chute is arranged on the periphery of the lens group, and when the cam ring rotates relative to the fixed cylinder, the driving chute drives the first bulge to drive the lens group to move front and back.

According to the technical scheme provided by the utility model, the cam ring is of an annular structure, namely a full-circle structure, not of a semicircular structure, processing precision can be ensured, the cam ring is sleeved in the fixed cylinder, the lens group is also arranged in the fixed cylinder, external dust and impurities are prevented from falling onto parts driven internally, the driving chute is arranged on the cam ring and is matched with the first bulge arranged on the lens group, the lens group can be driven to move forwards and backwards only by rotating the cam ring, focusing is realized, and the lens group does not rotate directly, so that the problem that the resolution force cannot correspond with the rotation change of a eccentric core is avoided, and the focusing structure capable of realizing high-precision and high-stability focusing is provided.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an exploded view of an embodiment of a focusing structure according to the present utility model;

FIG. 2 is a schematic perspective view of the stationary barrel of FIG. 1;

FIG. 3 is a schematic perspective view of the cam ring of FIG. 1;

FIG. 4 is a schematic perspective view of the lens assembly of FIG. 1;

fig. 5 is a schematic perspective view of an assembled focusing structure according to an embodiment of the present utility model;

fig. 6 is a perspective view of the retaining ring and the retaining member of fig. 1.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				100	Focusing structure	3a	First threaded hole
1	Fixing cylinder	4	First protrusion
				1a	Straight groove	5	Guide projection
1b	Adjusting groove	6	Second protrusion
				1c	Positioning hole	7	Fixing ring
2	Cam ring	7a	Limiting hole
				2a	Driving chute	7b	Yield groove
2b	Second threaded hole	8	Fixing piece
				3	Mirror group

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

At present, a cam structure is generally used for realizing group movement of an ultra-short focal lens, and a cam is generally arranged outside a fixed cylinder in an external mode; however, due to the structure of the ultra-short focal lens, the cam is arranged outside the fixed cylinder, the corresponding structural strength is weak, the dustproof effect is poor, the external cam is not a complete circle, most of the external cam is half, and the machining precision is difficult to ensure. In order to ensure the processing precision, CAM grooves of the CAM are also formed on the fixed cylinder, so that the precision can be ensured, but the problem is that the group moves back and forth in the fixed cylinder and is provided with rotary motion, the rotary motion can cause the eccentric core of the lens to change along with the rotation, and the problem that the resolution is not corresponding easily occurs.

In order to solve the above-mentioned problems, the present utility model provides a focusing structure 100, and fig. 1 to 3 are specific embodiments of the focusing structure 100 provided by the present utility model.

Referring to fig. 1 to 3, the focusing structure 100 includes a fixed tube 1, a cam ring 2, and a lens group 3, wherein the fixed tube 1 extends in a front-rear direction; the cam ring 2 is rotatably sleeved in the fixed tube 1, at least one driving chute 2a is formed on the peripheral wall of the cam ring 2, and the driving chute 2a extends in the front-back direction and is obliquely arranged along the circumferential direction of the cam ring 2; the lens group 3 is movably mounted in the fixed barrel 1 along the front-back direction, a first protrusion 4 matched with the driving chute 2a is arranged on the periphery of the lens group 3, and when the cam ring 2 rotates relative to the fixed barrel 1, the driving chute 2a drives the first protrusion 4 to drive the lens group 3 to move back and forth.

In the technical scheme provided by the utility model, the cam ring 2 is of an annular structure, namely a full-circle structure, not of a semicircular structure, the processing precision can be ensured, the cam ring 2 is sleeved in the fixed tube 1, the lens group 3 is also arranged in the fixed tube 1, external dust and impurities are prevented from falling onto parts driven internally, the driving chute 2a is arranged on the cam ring 2 and is matched with the first protrusion 4 arranged on the lens group 3, the lens group 3 can be driven to move forwards and backwards only by rotating the cam ring 2, focusing is realized, the lens group 3 does not rotate directly, and accordingly, the problem that the resolving power is not corresponding to the rotation variation is avoided, and the focusing structure 100 capable of realizing high-precision and high-stability focusing is provided.

It should be noted that, so, the mirror group can be followed fast the cam ring is gone into with dismantle, reaches the rapid rotation the effect of mirror group angle for the best angle of mirror group eccentric core is selected in the screening, thereby indirectly promoted production efficiency.

Further, in order to make the cam ring 2 more stable when driving the lens group 3 to move forward and backward, in the present embodiment, the inner wall of the fixed tube 1 is provided with a straight groove 1a extending in the forward and backward direction; the periphery of the lens group 3 is provided with a guide protrusion 5 matched with the straight groove 1a, when the cam ring 2 rotates relative to the fixed barrel 1, the guide protrusion 5 is restrained by the side wall of the straight groove 1a, so that the guide protrusion 5 can only move along the straight groove 1a, thereby driving the lens group 3 to move in the front-back direction only, and avoiding circumferential offset.

It will be appreciated that the straight groove 1a may be provided on the circumferential side of the lens group 3, and the guide projection 5 may be provided on the inner wall of the fixed barrel 1, but the straight groove 1a and the guide projection 5 may be provided on which part is provided in particular in consideration of the actual size of the lens group 3 and the fixed barrel 1, and the specific arrangement, according to the actual requirement.

Further, in order to make the cam ring 2 more stable when driving the lens group 3 to move back and forth, in the present embodiment, the driving chute 2a is provided in plurality, and a plurality of the driving chute 2a are arranged at intervals in the circumferential direction of the cam ring 2; the first protrusions 4 are provided in plurality, and each first protrusion 4 is engaged with a corresponding one of the driving chute 2 a. The side walls of the driving grooves are matched with the first protrusions 4, and the combined action drives the lens group 3 to move, so that the lens group 3 moves back and forth more stably, and the accuracy is higher.

The number of the driving chute 2a may be set in consideration of the adjustment stroke and the adjustment accuracy of the focusing structure 100. Because the external cam which is common at present is stressed at one point or two points, the stability is poorer, preferably, the driving chute 2a is arranged to be three, the first protrusion 4 is also arranged to be three, the three first protrusions 4 and the three driving chute 2a form a stable three-point structure, and the stability and the precision of the movement of the lens group 3 are further improved. The stability of the performance of the product in the transportation process of the built-in cam ring 2 is ensured through three points, and stable stress is realized.

Specifically, the first protrusion 4 may be integrally formed with the housing of the lens group 3, or may be a component that is mounted on the rear surface, and in this embodiment, a first threaded hole 3a is provided in the outer peripheral wall of the lens group 3; the first boss 4 includes the first boss fixed with the first screw hole 3a by a first screw. Therefore, when the shell of the lens group 3 is formed, the first protrusion 4 does not need to be formed, so that the shell forming process of the lens group 3 is simpler and more convenient, and the control difficulty of the forming accuracy of the first protrusion 4 is reduced. The first shaft sleeve is screwed to the first threaded hole 3a by only arranging a threaded hole on the shell of the lens group 3, and the diameter of the first shaft sleeve is only required to be considered to be matched with the driving chute 2 a. And will first axle sleeve with mirror group 3 threaded connection, make things convenient for the dismantlement and the installation of first axle sleeve when first axle sleeve damages or does not accord with the assembly requirement, only need change first axle sleeve can, need not change mirror group 3.

The fixed cylinder 1 is driven to rotate by a manual mode or an electric mode, but the electric mode has operation delay, is inconvenient to control and cannot meet the actual use requirement of a user, and the cam ring 2 is arranged in the fixed cylinder 1.

Further, in order to facilitate the manipulation of the cam ring 2, in the present embodiment, the Zhou Biguan of the fixed tube 1 is provided with an adjustment groove 1b, the adjustment groove 1b extending in the circumferential direction of the fixed tube 1; the outer peripheral wall of the cam ring 2 is provided with a second protrusion 6, and the second protrusion 6 is movably provided along the adjustment groove 1 b. Thus, when the cam ring 2 needs to be adjusted to rotate, the cam ring 2 can rotate only by pulling the second protrusion 6 to enable the second protrusion 6 to move along the extending direction of the adjusting groove 1 b.

Further, in the present embodiment, the plurality of the adjustment grooves 1b are provided, and the plurality of the adjustment grooves 1b are arranged at intervals along the circumferential direction of the fixed cylinder 1; the second protrusions 6 are provided in plurality, and each second protrusion 6 is matched with a corresponding one of the adjusting grooves 1 b. Thus, the user can conveniently dial the nearest second protrusion 6 no matter what angle the user holds the lens. More specifically, the adjustment grooves 1b are provided with three, and the second protrusions 6 are correspondingly provided with three. Thus, the convenient adjustment of the user under various angles can be basically satisfied.

Further, since the cam ring 2 can rotate along the circumferential direction of the fixed barrel 1, in order to enable the cam ring 2 to be in a stable working state after being adjusted to a proper position, so as to avoid the continuous rotation of the cam ring 2 and influence the use, in this embodiment, the focusing structure 100 further includes a fixed ring 7 and a fixing piece 8, a limiting hole 7a and a yielding groove 7b are arranged on the fixed ring 7 at intervals, the limiting hole 7a is used for the second protrusion 6 to pass through and locate, and the yielding groove 7b extends along the circumferential direction of the fixed ring 7; the fixed cylinder 1 is provided with a positioning hole 1c which is arranged corresponding to the abdication groove 7 b; the fixing ring 7 is movably mounted on the periphery of the fixing cylinder 1 along the circumferential direction of the fixing cylinder 1, so that the second protrusion 6 penetrating into the limiting hole 7a can drive the cam ring 2 to rotate, and the fixing piece 8 is used for penetrating into the yielding groove 7b to be fixedly matched with the positioning hole 1c so as to fix the fixing ring 7 on the fixing cylinder 1.

So, mounting 8 with locating hole 1c cooperates, because of second protruding 6 wears to locate spacing hole 7a on the solid fixed ring 7, when stirring gu fixed ring 7, second protruding 6 also moves along with gu fixed ring 7 is together, in order to avoid mounting 8 interferes gu fixed ring 7 moves, the groove 7b of stepping down provides the stepping down, after the mirror group 3 finishes adjusting, will mounting 8 is screwed up, will gu fixed ring 7 presss from both sides to locate between mounting 8 and the fixed section of thick bamboo 1.

The fixing member 8 may be a screw, the positioning hole 1c may be an internal threaded hole, and when the fixing ring 7 needs to be fixed, the screw may be screwed down, so that the nut of the screw fixedly clamps the fixing ring 7 to the fixing cylinder 1. Of course, the fixing member 8 may be provided in a wedge-shaped column structure with a gradually enlarged diameter, and the upper end of the fixing member 8 may fixedly clamp the fixing ring 7 to the fixing cylinder 1 when the fixing member 8 is gradually inserted into the positioning hole 1 c.

Further, for ease of assembly, in the present embodiment, a second screw hole 2b is provided on the outer peripheral wall of the cam ring 2; the second boss 6 includes a second sleeve fixed to the second threaded hole 2b by a second screw. In this way, the second protrusions 6 do not need to be formed when the cam ring 2 is formed, so that the forming process of the cam ring 2 is simpler. The second sleeve is in threaded connection with the cam ring 2, so that the second sleeve is convenient to detach and mount, and when the second sleeve is damaged or does not meet the assembly requirement, the second sleeve is only required to be replaced, and the cam ring 2 is not required to be replaced. When the cam ring 2 is installed, the outer diameter of the cam ring 2 is matched with the inner diameter of the fixed tube 1, the second sleeve is not installed firstly when the cam ring 2 is installed in the fixed tube 1, and after the cam ring 2 is installed in place, the second screw penetrates into the adjusting groove 1b to be in threaded connection with the second threaded hole 2b on the cam ring 2.

The present utility model also provides an imaging device, which includes the above-mentioned focusing structure 100, and because the imaging device includes the focusing structure 100, the specific structure of the focusing structure 100 refers to the above-mentioned embodiments, and because the focusing structure 100 of the imaging device adopts all the technical solutions of all the above-mentioned embodiments, at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which are not described in detail herein.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (10)

1. A focusing structure, characterized by comprising:

the fixed cylinder extends along the front and back directions;

the cam ring is rotatably sleeved in the fixed cylinder, at least one driving chute is formed on the peripheral wall of the cam ring, extends in the front-back direction and is obliquely arranged along the circumferential direction of the cam ring; the method comprises the steps of,

the lens group is movably arranged in the fixed cylinder along the front and back directions, a first bulge matched with the driving chute is arranged on the periphery of the lens group, and when the cam ring rotates relative to the fixed cylinder, the driving chute drives the first bulge to drive the lens group to move front and back.

2. The focusing structure as claimed in claim 1, wherein an inner wall of the fixed cylinder is provided with a straight groove extending in a front-rear direction;

the periphery of the lens group is provided with a guide protrusion matched with the straight groove, and when the cam ring rotates relative to the fixed cylinder, the guide protrusion moves along the straight groove.

3. The focusing structure according to claim 1, wherein a plurality of the drive chute are provided, the plurality of the drive chute being arranged at intervals along the circumferential direction of the cam ring;

the first protrusions are arranged in a plurality, and each first protrusion is matched with a corresponding driving chute.

4. The focusing structure as claimed in claim 1, wherein a first screw hole is provided on an outer peripheral wall of the lens group;

the first boss comprises a first shaft sleeve, and the first shaft sleeve is fixed with the first threaded hole through a first screw.

5. The focusing structure according to claim 1, wherein the driving chute is provided with three, and the first protrusion is provided with three correspondingly.

6. The focusing structure as claimed in claim 1, wherein Zhou Biguan of the fixed cylinder is provided with an adjustment groove extending in a circumferential direction of the fixed cylinder;

the outer peripheral wall of the cam ring is provided with a second protrusion in a protruding mode, and the second protrusion is movably arranged along the adjusting groove.

7. The focusing structure as claimed in claim 6, wherein a plurality of the adjustment grooves are provided, the plurality of the adjustment grooves being arranged at intervals along a circumferential direction of the fixed cylinder;

the second protrusions are arranged in a plurality, and each second protrusion is matched with a corresponding adjusting groove.

8. The focusing structure of claim 6, further comprising a fixing ring and a fixing member, wherein the fixing ring is provided with a limiting hole and a relief groove at intervals, the limiting hole is used for the second protrusion to pass through and locate, and the relief groove extends along the circumferential direction of the fixing ring;

the fixed cylinder is provided with a positioning hole which is arranged corresponding to the abdication groove;

the fixing ring is movably arranged on the periphery of the fixing barrel along the circumferential direction of the fixing barrel, so that the second protrusion penetrating into the limiting hole can drive the cam ring to rotate, and the fixing piece is used for penetrating into the yielding groove to be fixedly matched with the positioning hole so as to fix the fixing ring to the fixing barrel.

9. The focusing structure as claimed in claim 6, wherein a second screw hole is provided on an outer peripheral wall of the cam ring;

the second protrusion comprises a second sleeve, and the second sleeve is fixed with the second threaded hole through a second screw.

10. An imaging apparatus comprising a focusing structure according to any one of claims 1 to 9.