CN211018962U - Lens back focus continuous adjusting device and camera - Google Patents
Lens back focus continuous adjusting device and camera Download PDFInfo
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- CN211018962U CN211018962U CN201922263618.8U CN201922263618U CN211018962U CN 211018962 U CN211018962 U CN 211018962U CN 201922263618 U CN201922263618 U CN 201922263618U CN 211018962 U CN211018962 U CN 211018962U
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Abstract
The utility model discloses a burnt continuous adjustment device and camera behind camera lens, wherein, burnt continuous adjustment device behind camera lens, including the casing that is equipped with the center with the fixed owner dress board of casing cooperation, be equipped with between casing and the owner dress board with the fixed lifting disk of image sensor and rotate the toothed disc of being connected with owner dress board pivot to and drive toothed disc makes the lifting disk along the flexible actuating mechanism of optical axis direction, burnt continuous adjustment device still includes the continuous telescopic machanism who turns into lifting disk along axial concertina movement with the toothed disc continuous rotation behind the camera lens. Because the back focal continuous adjusting device of the lens can be continuously rotated in one direction by the driving mechanism during focusing, the periodical continuous telescopic focusing can be realized, the structure is simple, and the control difficulty is low. Meanwhile, the telescopic focusing mechanism continuously rotates in the same direction, the friction range is dispersed, and the rotation in a small range in the focusing process can be avoided, so that the friction range is concentrated, and the focusing precision is reduced due to the fact that friction occurs more easily.
Description
Technical Field
The utility model relates to a technical field of make a video recording, in particular to burnt continuous adjusting device behind camera lens and make burnt adjusting device's camera behind this camera lens.
Background
After the lens of the existing camera is installed, the back focus of the lens of the camera needs to be adjusted after the camera is installed, so that the focus at the back end of the lens is aligned with the imaging surface of the image sensor to enable an image in a view field range to be clear. Especially, the camera with a high installation position has large adjustment difficulty after installation, so that remote or automatic focusing is required.
At present, two focusing methods are commonly used for a camera, namely, the distance between a lens and an image sensor is adjusted; the other is to adjust the position of the image sensor without moving the lens, which is also called ABF (Auto Back Focus). In the former, focusing is performed by adjusting the position of a lens, and although the focusing range is large, the structure is complex and the volume is large; the latter focusing is generally applicable to a lens back focus adjusting device and a camera with small focusing position movement, such as CN206759586U, in which the lens is controlled to move in a telescopic manner by the forward and backward rotation of a motor, but the adjusting device is matched with a key pin by a spiral groove, and the motor can only extend by forward rotation or backward rotation when driven, and retract by backward rotation or forward rotation, so that the control relationship is complicated, and the control difficulty is large. Meanwhile, the rotation angle is limited during control, so that the high-coke precision is reduced due to easy abrasion.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the main technical problem who solves provides burnt continuous adjusting device and camera behind camera lens, and wherein burnt continuous adjusting device behind the camera lens can reduce the focusing control degree of difficulty.
In order to solve the problem, the utility model provides a burnt continuous regulating apparatus behind camera lens, burnt continuous regulating apparatus behind this camera lens, including the casing that is equipped with the center with the fixed main dress board of casing cooperation, the intracavity of accomodating that forms between casing and main dress board is equipped with fixed image sensor's lifter plate and uses the gear disc of main dress board upper center guide pillar as the pivot to and drive gear disc makes the lifter plate along the flexible actuating mechanism of optical axis direction, burnt continuous regulating apparatus still includes the continuous telescopic machanism who turns into the lifter plate along axial concertina movement with gear disc continuous rotation behind the camera lens.
Furthermore, the continuous telescopic mechanism comprises at least two bulges respectively arranged on the contact surfaces of the gear disc and the lifting disc, a groove is arranged between each bulge, the axial end surfaces of each bulge and each groove sequentially form a continuous wavy curved surface in annular distribution, and the bulges on the gear disc and the grooves on the lifting disc are distributed in a staggered manner.
Further, each protrusion mirrors the shape of the groove.
Furthermore, each protrusion is uniformly distributed on the same circumference, and the circle center is located on the optical axis of the lens.
Further, the number of the protrusions is three or four.
Furthermore, a guide mechanism is arranged between the lifting disc and the main mounting plate.
Furthermore, the guiding mechanism comprises at least three guiding columns which are uniformly distributed on the same circumference, and each guiding column is uniformly distributed on the same circumference.
Further, the lens back focus continuous adjusting device further comprises an elastic component which enables the lifting disc to be in contact with the gear disc.
Further, the elastic member includes a spring.
Furthermore, a first rolling mechanism is arranged between the gear disc and the main mounting plate.
Further, the first rolling mechanism comprises at least three fixed holes arranged on the gear disc and a first rolling ball arranged in each fixed hole.
Furthermore, the main mounting plate is provided with a limiting groove matched with the first rolling ball.
Furthermore, a second rolling mechanism is arranged between the gear disc and the central guide post.
Furthermore, the second rolling mechanism comprises at least three C-shaped holes formed in the gear disc and a second rolling ball accommodated in the C-shaped hole of each gear disc, and the second rolling balls are in contact with the central guide pillar.
Further, each C-shaped cavity is evenly distributed on the same circumference.
Furthermore, each fixing hole is uniformly distributed on the same circumference.
Furthermore, a light-filtering switch is arranged on the light-entering side of the image sensor.
Furthermore, the driving mechanism comprises a stepping motor and a reduction gear set which is meshed with a rotating shaft of the stepping motor to rotate, and an output gear of the reduction gear set is meshed with and driven by a gear which is annularly distributed on the gear disc.
The utility model also provides a camera, burnt continuous adjusting device behind this camera includes the camera lens, burnt continuous adjusting device behind this camera lens, including the casing that is equipped with the center with the main dress board that the casing cooperation is fixed, the intracavity of accomodating that forms between casing and main dress board is equipped with fixed image sensor's lifting disk and uses the gear disc of main dress board upper shed center guide pillar as the pivot to and drive gear disc makes the lifting disk along the flexible actuating mechanism of optical axis direction, burnt continuous adjusting device still includes the continuous telescopic machanism who turns into the lifting disk along axial concertina movement with gear disc continuous rotation behind the camera lens.
Furthermore, the continuous telescopic mechanism comprises at least two bulges respectively arranged on the contact surfaces of the gear disc and the lifting disc, a groove is arranged between each bulge, the axial end surfaces of each bulge and each groove sequentially form a continuous wavy curved surface in annular distribution, and the bulges on the gear disc and the grooves on the lifting disc are distributed in a staggered manner.
Further, each protrusion mirrors the shape of the groove.
Furthermore, each protrusion is uniformly distributed on the same circumference, and the circle center is located on the optical axis of the lens.
Further, the number of the protrusions is three or four.
Furthermore, a guide mechanism is arranged between the lifting disc and the main mounting plate.
Furthermore, the guiding mechanism comprises at least three guiding columns which are uniformly distributed on the same circumference, and each guiding column is uniformly distributed on the same circumference.
Further, the lens back focus continuous adjusting device further comprises an elastic component which enables the lifting disc to be in contact with the gear disc.
Further, the elastic member includes a spring.
Furthermore, a first rolling mechanism is arranged between the gear disc and the main mounting plate.
Further, the first rolling mechanism comprises at least three fixed holes arranged on the gear disc and a first rolling ball arranged in each fixed hole.
Furthermore, the main mounting plate is provided with a limiting groove matched with the first rolling ball.
Furthermore, a second rolling mechanism is arranged between the gear disc and the central guide post.
Furthermore, the second rolling mechanism comprises at least three C-shaped holes formed in the gear disc and a second rolling ball accommodated in the C-shaped hole of each gear disc, and the second rolling balls are in contact with the central guide pillar.
Further, each C-shaped cavity is evenly distributed on the same circumference.
Furthermore, each fixing hole is uniformly distributed on the same circumference.
Furthermore, a light-filtering switch is arranged on the light-entering side of the image sensor.
Furthermore, the driving mechanism comprises a stepping motor and a reduction gear set which is meshed with a rotating shaft of the stepping motor to rotate, and an output gear of the reduction gear set is meshed with and driven by a gear which is annularly distributed on the gear disc.
The utility model relates to a burnt continuous adjustment device and camera behind camera lens, wherein, burnt continuous adjustment device behind camera lens including the casing that is equipped with the center with the casing cooperation fixed owner dress board, be equipped with between casing and the owner dress board with the fixed lifting disk of image sensor and rotate the toothed disc of being connected with the pivot of owner dress board to and drive toothed disc makes the lifting disk along the flexible actuating mechanism of optical axis direction, burnt continuous adjustment device behind camera lens still includes and turns into the continuous telescopic machanism of lifting disk along axial concertina movement with the continuous rotation of toothed disc. Because the back focal continuous adjusting device of the lens can be continuously rotated in one direction by the driving mechanism during focusing, the periodical continuous telescopic focusing can be realized, the structure is simple, and the control difficulty is low. Meanwhile, the telescopic focusing can be realized due to the fact that the telescopic focusing can be continuously rotated in the same direction, friction ranges are distributed dispersedly, rotation in a small range in the focusing process can be avoided, the friction ranges are concentrated, and the focusing precision is reduced due to the fact that friction occurs easily.
A plurality of guide posts are matched with the springs, so that on one hand, the lifting plate generates reset force to be dispersed in the stretching process; on the other hand, the plurality of springs are used for controlling the lifting disc to generate resetting force in the telescopic process more easily.
Drawings
In order to illustrate more clearly the embodiments of the invention or the solutions of the prior art, reference will now be made briefly to the attached drawings that are needed in the description of the embodiments or the prior art, it being understood that the drawings in the description illustrate only some embodiments of the invention and are therefore not to be considered limiting of its scope, and that, to a person skilled in the art, other related drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic sectional view of an embodiment of a lens back focus continuous adjustment device along an optical axis direction.
Fig. 2 is an exploded schematic view of an embodiment of a lens back focus continuous adjustment device.
Fig. 3 is a schematic structural diagram of an embodiment of a gear plate.
Fig. 4 is a schematic structural diagram of the orthographic projection of the gear disc along the rotating shaft direction.
Fig. 5 is a schematic structural diagram of the orthographic projection of the gear disc along the vertical direction of the rotating shaft.
Fig. 6 is a schematic structural diagram of an embodiment of the lifting plate.
Fig. 7 is a schematic diagram of an orthographic projection structure of the lifting disc along the vertical direction of the rotating shaft.
Fig. 8 is a schematic structural diagram of an orthographic projection of the lifting disc along the rotating shaft direction.
Fig. 9 is a schematic view of the structure of the gear plate and the main mounting plate.
Fig. 10 is a schematic front projection structure diagram of the gear plate and the main mounting plate when matched.
Fig. 11 is a schematic sectional view along the upper H-H direction in fig. 10.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The following claims are presented in further detail with reference to specific embodiments and the accompanying drawings, it being understood that the described embodiments are only some embodiments of the invention, but are all embodiments. Based on the embodiments of the present invention, those skilled in the art can find out all other embodiments without creative efforts, and all the embodiments also belong to the protection scope of the present invention.
It is to be understood that in the description of the present invention, all directional terms such as "upper", "lower", "left", "right", "front", "rear", etc. are used herein to indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or component being referred to must have a specific orientation, be constructed and operated in a specific orientation. For the purpose of explaining the relative positional relationship of the components, the movement, etc., as shown in the drawings, when the specific attitude is changed, the directional indication may be changed accordingly.
Furthermore, ordinal numbers such as "first," "second," etc., are used for distinguishing between and not to indicate or imply relative importance or imply that the number of technical features indicated. The technical features "first" and "second" may be explicit or implicit and at least one of the technical features may be limited thereby. In the description of the present invention, "a plurality" means at least two, i.e., two or more, unless expressly defined otherwise; the meaning of "at least one" is one or more than one.
As shown in fig. 1-11, the present invention provides an embodiment of a continuous adjusting device for back focal length of a lens.
This burnt continuous adjusting device behind camera lens, including the casing 9 that is equipped with the center and with casing 9 cooperation fixed owner dress board 1, be equipped with between casing 9 and owner dress board 1 with image sensor 7 the lifting disk 4 with the toothed disc 3 of main dress board 1 pivot rotation connection to and drive toothed disc 3 makes lifting disk 4 along the flexible actuating mechanism 2 of optical axis direction, still include the continuous telescopic machanism who turns into lifting disk 4 along axial concertina movement with toothed disc 3 continuous rotation. When the driving mechanism continuously rotates in the same direction to drive the gear plate 3 to rotate, the continuous telescopic mechanism can change the distance between the image sensor 7 on the lifting plate 4 and the lens in the optical axis direction.
Specifically, the housing 9 is provided with a lens holder 10 for fixing a lens, and the optical axis of the lens is aligned with the center line of the center hole of the housing 9. Image sensor 7 is fixed on image sensor support 5, and this image sensor 7 is not the utility model discloses technical essential can adopt prior art to realize, and it includes but not limited to photoelectric devices such as CMOS, CCD.
As shown in fig. 3-8, the continuous telescoping mechanism includes at least two protrusions respectively disposed on the contact surface of the gear plate 3 and the lifting plate 4, a groove is disposed between each protrusion, the axial end surfaces of each protrusion and the groove sequentially form a continuous wavy curved surface in annular distribution, and the protrusions on the gear plate 3 and the grooves on the lifting plate 3 are distributed in a staggered manner. That is, the contact surface of the gear plate 3 and the lifting plate 4 is provided with at least two protrusions 32, in this embodiment, four protrusions 32 are taken as an example, a groove 33 is provided between each protrusion 32, and each protrusion 32 and each groove 33 sequentially form a continuous wavy curved surface in an annular distribution at the axial end surface. The contact surface of the lifting disk 4 and the gear disk 3 is provided with at least two protrusions 41, a groove 42 is arranged between each protrusion 41, each protrusion 41 and each groove 42 sequentially form continuous wave curves distributed annularly on the axial end surface, the structure of the protrusion 32 and the groove 33 on the gear disk 3 is preferably the same, the structure of the protrusion 41 and the groove 42 on the lifting disk 4 is preferably the same, and the protrusion 32 and the lifting disk 4 are also preferably the same, namely the shape of each protrusion and the shape of each groove are mirror images. The protrusions on each gear plate 3 or each lifting plate 4 are uniformly distributed on the same circumference with the optical axis of the lens as the center of a circle. The lifting disc 4 and the gear disc 3 are always parallel when the telescopic mechanism is used.
The image sensor bracket 5 fixed with the image sensor 7, the lifting disc 4, the gear disc 3 and the main mounting plate 1 are sequentially overlapped and assembled in a cavity formed by the main mounting plate 1 and the shell 9, wherein the image sensor bracket 5 is fixed with the lifting disc 4, for example, the image sensor bracket 5 is fixed with the lifting disc 4 through screws; the lifting disc 4 and the gear disc 3 slide on the circumference to be converted into axial motion, and the gear disc 3 is rotationally connected with the main mounting plate 1.
The gear disc 3 is provided with a gear disc body with a central hole 30, the gear disc body is provided with a ring gear 31, the central hole 30 is sleeved on the central guide pillar 12 on the main mounting plate 1, and the central guide pillar 12 is used as a rotating shaft.
The main mounting plate 1 is provided with a gear plate 3 rotating shaft and a guide mechanism, the guide mechanism can enable the lifting plate 4 to stably move during telescopic motion, and the moving direction is consistent with the optical axis, wherein the rotating shaft adopts a hollow central guide pillar 12 in the embodiment, and the hollow central guide pillar 12 can reduce the weight of the main mounting plate 11 and save the material cost; meanwhile, the main mounting plate 11 is usually made of plastic materials, and when the central guide post 12 with a hollow structure is integrally formed with the main mounting plate 1, the shrinkage phenomenon can be avoided, and the forming precision is improved.
The guide mechanism comprises at least three guide posts 11 at least respectively arranged on the periphery of the central guide post 12, the number of the guide posts 11 can be three, four or more according to the requirement, and the number of the guide posts 11 is preferably 3-4 according to the production cost and the process difficulty. Each guide post 11 is uniformly distributed on the same circumference, and the circle center of the circle is positioned on the optical axis, so that the acting force between the lifting disc 4 and each guide post 11 is the same when the lifting disc moves in a telescopic way, and the moving direction of the lifting disc and the optical axis are on the same straight line.
The driving mechanism 2 comprises a stepping motor 22 and a reduction gear set 21 which is meshed with the rotating shaft of the stepping motor 22 to rotate, and an output gear of the reduction gear set 21 is meshed with a ring gear 31 on the gear disc 3 for transmission.
When the focal length is adjusted, the gear plate 3 is driven by the stepping motor 22 to rotate by taking the rotating central guide post 12 as a rotating shaft, and the gear plate 3 and the lifting plate 4 are provided with a continuous telescopic structure and the stepping motor 22 can rotate continuously in the same direction, so that periodic telescopic focusing can be realized, the structure is simple, and the control difficulty is low. Meanwhile, the telescopic focusing can be realized due to the fact that the telescopic focusing can be continuously rotated in the same direction, friction ranges are distributed dispersedly, rotation in a small range in the focusing process can be avoided, the friction ranges are concentrated, and the focusing precision is reduced due to the fact that friction occurs easily.
According to the needs, in order to ensure that the lifting disc is contacted with the gear disc when the lens rear focus continuous adjusting device is stretched, the elastic component 6 is further included, and the elastic component 6 is sleeved on the guide post 11 and is positioned between the shell 9 and the image sensor bracket 5. Because the elastic components 6 are uniformly distributed between the shell 9 and the image sensor bracket 5, the reset force generated by the lifting disc in the stretching process is dispersed; meanwhile, the plurality of springs are used for controlling the lifting disc to generate reset acting force in the stretching process more easily.
In order to reduce the friction between the gear plate 3 and the main mounting plate 1, a first rolling mechanism is provided between the gear plate 3 and the main mounting plate 1. The first rolling mechanism comprises at least three fixed pockets 35 provided in the gear wheel 3 and a first ball 15 provided in each fixed pocket 35. The first rolling balls 15 are uniformly distributed on the circumference which takes the center of the central guide post 12 as the center of a circle. The main mounting plate 1 is provided with a limiting groove 14 matched with the first rolling ball.
In order to reduce the friction between the gear plate 3 and the core beam 12 during adjustment and the phenomenon of material shrinkage caused by temperature change, a second rolling mechanism is arranged between the gear plate 3 and the core beam 12. The second rolling mechanism comprises at least three C-shaped holes 34 arranged on the gear disc 3 and second rolling balls accommodated in the C-shaped holes 34 of each gear disc, the second rolling balls are in contact with the central guide post 12, and the second rolling balls are uniformly distributed on the circumference which takes the center of the central guide post 12 as the circle center.
If necessary, a filter switch 8 is provided on the light entrance side of the image sensor, and the filter switch 8 is located between the housing 9 and the image sensor 7. The specific structure of the filter switcher 8 is not essential to the present invention, and it can be implemented by adopting the prior art.
The utility model also provides a camera, burnt continuous adjusting device behind this camera includes the camera lens, burnt continuous adjusting device adopts above-mentioned embodiment structure behind this camera lens.
Specifically speaking, the continuous adjusting device for the back focus of the lens comprises a shell 9 with a center, a main mounting plate 1 matched and fixed with the shell 9, a lifting disc 4 connected with an image sensor 7, a gear disc 3 rotationally connected with a rotating shaft of the main mounting plate 1, a driving mechanism 2 driving the gear disc 3 to enable the lifting disc 4 to stretch and retract along the optical axis direction, and a continuous telescopic mechanism converting the continuous rotation of the gear disc 3 into the axial telescopic motion of the lifting disc 4. When the driving mechanism continuously rotates in the same direction to drive the gear plate 3 to rotate, the continuous telescopic mechanism can change the distance between the image sensor 7 on the lifting plate 4 and the lens in the optical axis direction.
Specifically, the housing 9 is provided with a lens holder 10 for fixing a lens, and the optical axis of the lens is aligned with the center line of the center hole of the housing 9. Image sensor 7 is fixed on image sensor support 5, and this image sensor 7 is not the utility model discloses technical essential can adopt prior art to realize, and it includes but not limited to photoelectric devices such as CMOS, CCD.
As shown in fig. 3-8, the continuous telescoping mechanism includes at least two protrusions respectively disposed on the contact surface of the gear plate 3 and the lifting plate 4, a groove is disposed between each protrusion, the axial end surfaces of each protrusion and the groove sequentially form a continuous wavy curved surface in annular distribution, and the protrusions on the gear plate 3 and the grooves on the lifting plate 3 are distributed in a staggered manner. That is, the contact surface of the gear plate 3 and the lifting plate 4 is provided with at least two protrusions 32, in this embodiment, four protrusions 32 are taken as an example, a groove 33 is provided between each protrusion 32, and each protrusion 32 and each groove 33 sequentially form a continuous wavy curved surface in an annular distribution at the axial end surface. The contact surface of the lifting disk 4 and the gear disk 3 is provided with at least two protrusions 41, a groove 42 is arranged between each protrusion 41, each protrusion 41 and each groove 42 sequentially form a continuous wavy curved surface in annular distribution on the axial end surface, the structure of the protrusion 32 and the groove 33 on the gear disk 3 is preferably the same, the structure of the protrusion 41 and the groove 42 on the lifting disk 4 is preferably the same, and the protrusion 32 and the lifting disk 4 are also preferably the same, namely the shape of each protrusion and the shape of each groove are mirror images. The protrusions on each gear plate 3 or each lifting plate 4 are uniformly distributed on the same circumference with the optical axis of the lens as the center of a circle. The lifting disc 4 and the gear disc 3 are always parallel when the telescopic mechanism is used.
The image sensor bracket 5 fixed with the image sensor 7, the lifting disc 4, the gear disc 3 and the main mounting plate 1 are sequentially overlapped and assembled in a cavity formed by the main mounting plate 1 and the shell 9, wherein the image sensor bracket 5 is fixed with the lifting disc 4, for example, the image sensor bracket 5 is fixed with the lifting disc 4 through screws; the lifting disc 4 and the gear disc 3 slide on the circumference to be converted into axial motion, and the gear disc 3 is rotationally connected with the main mounting plate 1.
The gear disc 3 is provided with a gear disc body with a central hole 30, the gear disc body is provided with a ring gear 31, the central hole 30 is sleeved on the central guide pillar 12 on the main mounting plate 1, and the central guide pillar 12 is used as a rotating shaft.
The main mounting plate 1 is provided with a gear plate 3 rotating shaft and a guide mechanism, the guide mechanism can enable the lifting plate 4 to stably move during telescopic motion, and the moving direction is consistent with the optical axis, wherein the rotating shaft adopts a hollow central guide pillar 12 in the embodiment, and the hollow central guide pillar 12 can reduce the weight of the main mounting plate 1 and save the material cost; meanwhile, the main mounting plate 11 is usually made of plastic materials, and when the central guide post 12 with a hollow structure is integrally formed with the main mounting plate 1, the shrinkage phenomenon can be avoided, and the forming precision is improved.
The guide mechanism comprises at least three guide posts 11 at least respectively arranged on the periphery of the central guide post 12, the number of the guide posts 11 can be three, four or more according to the requirement, and the number of the guide posts 11 is preferably 3-4 according to the production cost and the process difficulty. Each guide post 11 is uniformly distributed on the same circumference, and the circle center of the circle is positioned on the optical axis, so that the acting force between the lifting disc 4 and each guide post 11 is the same when the lifting disc moves in a telescopic way, and the moving direction of the lifting disc and the optical axis are on the same straight line.
The driving mechanism 2 comprises a stepping motor 22 and a reduction gear set 21 which is meshed with the rotating shaft of the stepping motor 22 to rotate, and an output gear of the reduction gear set 21 is meshed with a ring gear 31 on the gear disc 3 for transmission.
When the focal length is adjusted, the gear plate 3 is driven by the stepping motor 22 to rotate by taking the rotating central guide post 12 as a rotating shaft, and the gear plate 3 and the lifting plate 4 are provided with a continuous telescopic structure and the stepping motor 22 can rotate continuously in the same direction, so that periodic telescopic focusing can be realized, the structure is simple, and the control difficulty is low. Meanwhile, the telescopic focusing can be realized due to the fact that the telescopic focusing can be continuously rotated in the same direction, friction ranges are distributed dispersedly, rotation in a small range in the focusing process can be avoided, the friction ranges are concentrated, and the focusing precision is reduced due to the fact that friction occurs easily.
According to the needs, in order to ensure that the lifting disc is contacted with the gear disc when the lens rear focus continuous adjusting device is stretched, the elastic component 6 is further arranged, and the elastic component 6 is sleeved on the guide post and is positioned between the shell 9 and the image sensor bracket 5. Because the elastic components 6 are uniformly distributed between the shell 9 and the image sensor bracket 5, the reset force generated by the lifting disc in the stretching process is dispersed; meanwhile, the plurality of springs are used for controlling the lifting disc to generate reset acting force in the stretching process more easily.
In order to reduce the friction between the gear plate 3 and the main mounting plate 1, a first rolling mechanism is provided between the gear plate 3 and the main mounting plate 1. The first rolling mechanism comprises at least three fixed pockets 35 provided in the gear wheel 3 and a first ball 15 provided in each fixed pocket 35. The first rolling balls 15 are uniformly distributed on the circumference which takes the center of the central guide post 12 as the center of a circle. The main mounting plate 1 is provided with a limiting groove 14 matched with the first rolling ball.
In order to reduce the friction between the gear plate 3 and the core beam 12 during adjustment and the phenomenon of material shrinkage caused by temperature change, a second rolling mechanism is arranged between the gear plate 3 and the core beam 12. The second rolling mechanism comprises at least three C-shaped holes 34 arranged on the gear disc 3 and second rolling balls accommodated in the C-shaped holes 34 of each gear disc, the second rolling balls are in contact with the central guide post 12, and the second rolling balls are uniformly distributed on the circumference which takes the center of the central guide post 12 as the circle center.
If necessary, a filter switch 8 is provided on the light entrance side of the image sensor, and the filter switch 8 is located between the housing 9 and the image sensor 7. The specific structure of the filter switcher 8 is not essential to the present invention, and it can be implemented by adopting the prior art.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: it is to be understood that modifications may be made to the above-described arrangements in the embodiments or equivalents may be substituted for some of the features of the embodiments without departing from the spirit or scope of the present invention.
Claims (17)
1. The lens back focus continuous adjusting device comprises a shell with a center and a main mounting plate matched and fixed with the shell, a lifting disc fixed with an image sensor, a gear disc rotationally connected with a main mounting plate rotating shaft and a driving mechanism driving the gear disc to make the lifting disc extend and retract along the optical axis direction, and is characterized in that,
the lens back focus continuous adjusting device further comprises a continuous telescopic mechanism for converting the continuous rotation of the gear disc into the telescopic movement of the lifting disc along the axial direction.
2. The device for continuously adjusting the back focus of a lens according to claim 1, wherein the continuous telescopic mechanism comprises at least two protrusions respectively disposed on the contact surfaces of the gear plate and the lifting plate, a groove is disposed between each protrusion, the axial end surfaces of each protrusion and the groove sequentially form a continuous wavy curved surface in an annular distribution, and the protrusions on the gear plate and the grooves on the lifting plate are distributed in a staggered manner.
3. The device for continuously adjusting the back focus of a lens according to claim 2, wherein each protrusion is the same as a mirror image of the shape of the groove.
4. The device for continuously adjusting the back focus of a lens according to claim 2, wherein each of the protrusions is uniformly distributed on the same circumference, and the center of the circle is located on the optical axis of the lens.
5. The device for continuously adjusting the back focus of a lens according to claim 4, wherein the number of the protrusions is three or four.
6. The device for continuously adjusting the back focal length of a lens according to claim 4, wherein a guide mechanism is provided between the lifting plate and the main mounting plate.
7. The device for continuously adjusting the back focal length of a lens according to claim 6, wherein the guide mechanism comprises at least three guide posts, and each guide post is uniformly distributed on the same circumference.
8. The continuous lens back focus adjustment device according to claim 7, further comprising an elastic member that brings the lifting plate into contact with the gear plate.
9. The device for continuously adjusting back focus of a lens according to claim 8, wherein the elastic member includes a spring.
10. The device for continuously adjusting the back focal length of a lens according to claim 1, wherein a first rolling mechanism is provided between the gear plate and the main mounting plate.
11. The device for continuously adjusting the back focus of a lens according to claim 10, wherein the first rolling mechanism comprises at least three fixed cavities provided in the gear plate and a first rolling ball provided in each fixed cavity.
12. The device for continuously adjusting the back focus of a lens according to claim 1, wherein a second rolling mechanism is provided between the gear plate and the core beam.
13. The apparatus according to claim 12, wherein the second rolling mechanism comprises at least three C-shaped cavities provided in the gear plate and a second rolling ball received in the C-shaped cavity of each gear plate, the second rolling ball being in contact with the core beam.
14. The device for continuously adjusting the back focus of a lens according to claim 12, wherein each of the C-shaped cavities is uniformly distributed on the same circumference.
15. The device for continuously adjusting the back focus of a lens according to claim 11, wherein each of the fixing cavities is uniformly distributed on the same circumference.
16. The device as claimed in claim 1, wherein the light entrance side of the image sensor is provided with a filter switch.
17. A camera comprising the lens back focus continuous adjustment device according to any one of claims 1 to 16.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922263618.8U CN211018962U (en) | 2019-12-16 | 2019-12-16 | Lens back focus continuous adjusting device and camera |
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| CN201922263618.8U CN211018962U (en) | 2019-12-16 | 2019-12-16 | Lens back focus continuous adjusting device and camera |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111031207A (en) * | 2019-12-16 | 2020-04-17 | 深圳市瀚晖威视科技有限公司 | Lens back focus continuous adjusting device and camera |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111031207A (en) * | 2019-12-16 | 2020-04-17 | 深圳市瀚晖威视科技有限公司 | Lens back focus continuous adjusting device and camera |
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