CN114594646A - Lens movement device, optical instrument, and camera - Google Patents

Abstract

The invention relates to the technical field of optics and discloses a lens movement device, an optical instrument and a camera, wherein the device comprises a lens body, a lens seat, a sensor circuit board, an adjusting mechanism and a plurality of optical filters with different thicknesses; each filter is suitable for different object distance ranges; the lens base is arranged on the sensor circuit board, the lens body is arranged on the lens base, the plurality of optical filters are arranged on the adjusting mechanism, and the adjusting mechanism is arranged on the lens base; the adjusting mechanism is used for driving each optical filter to be sequentially aligned with the lens body so as to acquire and fuse the clear parts of the images acquired by the plurality of optical filters. The optical filters are driven to be sequentially aligned with the lens body, and then the sensor circuit board is used for acquiring and fusing the clear parts of the images acquired by the optical filters, so that the image pictures with different depths of field and all clear can be acquired, the cost is saved, and the real-time focusing of the same picture with different depths of field can be realized.

Description

Lens movement device, optical instrument, and camera

The present application claims priority of chinese patent application entitled "lens movement apparatus, optical instrument, and camera" filed by the intellectual property office of the people's republic of china at 27/1/2022 under the application number 202210097461.X, the entire contents of which are incorporated herein by reference.

Technical Field

The present invention relates to the field of optical technologies, and in particular, to a lens barrel apparatus, an optical instrument, and a camera.

Background

According to the optical principle, focal planes imaged by objects with different distances in the same set of optical system are different, and based on the fact that the aperture of the existing security camera product is continuously enlarged, the pixel of a sensor is continuously reduced, the depth of field is continuously reduced, and the single super-depth of field focusing factory focusing product can hardly meet the customized requirements of customers.

The solution in the prior art includes adjusting the distance between a fixed focus lens and an image sensor through a voice coil motor so as to change the back focus of an optical system to realize automatic focusing; or as described in patent publication No. CN 111432126A: focusing with the same depth of field is realized by switching the optical filters with different thicknesses; further, as described in patent No. CN 105009562A: focusing of different depths of field is realized by adopting a movable lens and an MEMS driving mechanism.

However, the cost of the voice coil motor lens mount is extremely high; the method described in patent publication No. CN111432126A cannot realize simultaneous definition of the near view and the far view in the same sub-screen, and cannot realize real-time focusing; the system disclosed in the patent publication CN105009562A requires a dedicated drive circuit, which is also expensive, and the mutual movement between the lenses is likely to introduce stray light and ghost images, which affect the quality of image acquisition.

Therefore, how to realize real-time focusing of different depths of field on the same sub-screen while saving cost is a technical problem to be solved in the art.

Disclosure of Invention

The invention provides a lens movement device, an optical instrument and a camera, wherein the lens movement device can prevent virtual focus from being generated and realize that images with different depths of field of the same frame of picture are clear at the same time.

In order to achieve the purpose, the invention provides the following technical scheme:

a lens movement device comprises a lens body, a lens seat, a sensor circuit board, an adjusting mechanism and a plurality of optical filters with different thicknesses; wherein each filter is adapted for a different range of object distances; the lens base is arranged on the sensor circuit board, the lens body is arranged on the lens base, the plurality of optical filters are arranged on the adjusting mechanism, and the adjusting mechanism is arranged on the lens base; the adjusting mechanism is used for driving each optical filter to be sequentially aligned with the lens body so as to acquire and fuse the clear parts of the images acquired by the plurality of optical filters.

Before working, the lens movement device provided by the invention selects a plurality of optical filters suitable for different object distance ranges and installs the optical filters on the adjusting mechanism; when the lens is in work, the adjusting mechanism is started to sequentially drive each optical filter to be aligned with the lens body, so that the sensor circuit board acquires and fuses the plurality of optical filters to acquire clear parts of images, and an image picture with different depths of field and clear images is acquired; when the object distance of the shot image changes, the adjusting mechanism can still drive each optical filter to be aligned with the lens body in sequence, so that the corresponding clear part of each optical filter changes, the image finally fused by the sensor circuit board also changes, and the finally obtained image still has clear different depth of field.

Therefore, the lens movement device can acquire clear image frames with different depth of field by driving each optical filter to be sequentially aligned with the lens body and acquiring and fusing clear parts of the images by the plurality of optical filters through the sensor circuit board, and does not need to be provided with a voice coil motor lens mount or a targeted development drive circuit, so that the cost is saved; in addition, even if the object distance of the shot image is changed, the image finally generated by fusing the sensor circuit board is still clear, so that the real-time focusing of the same picture with different depths of field can be realized.

Optionally, the adjustment mechanism is a rotation mechanism; the rotating mechanism comprises a bracket, and the bracket is used for mounting a plurality of optical filters; the rotating mechanism is used for driving the optical filters to rotate so as to enable each optical filter to be aligned with the lens body in sequence.

Optionally, the rotating mechanism further comprises a motor, a housing, a connecting assembly, and a cover plate; the motor is fixedly connected with the outer side of the shell, and an output shaft of the motor penetrates through the shell; the connecting assembly is respectively connected with the output shaft and the bracket and is used for driving the bracket to rotate along with the rotation of the output shaft; the shell and the cover plate form a containing cavity, and the containing cavity is used for containing the connecting assembly, the support and the optical filter.

Optionally, the coupling assembly comprises a first gear, a second gear and a rotating shaft; the first gear is in interference fit with the output shaft and can rotate by taking the output shaft as an axis; the second gear is installed on the shell through a rotating shaft and is fixedly connected with the support.

Optionally, the cover plate has an opening; the opening is used for exposing one optical filter.

Optionally, the lens mount has a through hole passing through itself; the lens, the through hole and the opening are correspondingly arranged; the through hole forms an optical channel so that the optical filter exposed to the opening is aligned with the lens body.

An optical instrument includes any one of the above lens movement devices.

A camera comprises a front shell, a lens movement device and a rear barrel; the front shell and the rear barrel cooperate to accommodate the lens movement device.

Alternatively, the lens movement device is fixed to the rear barrel of the camera by a mounting plate.

Drawings

Fig. 1 is a schematic structural diagram of a lens barrel movement device according to an embodiment of the present invention;

fig. 2 is an exploded view of a lens barrel device according to an embodiment of the present invention;

fig. 3 is a schematic diagram illustrating a relationship between an optical angle and an optical path compensation amount of an optical filter in a lens barrel apparatus according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of an adjusting mechanism in a lens barrel movement apparatus according to an embodiment of the present invention;

fig. 5 is an exploded view of a structure of a rotating mechanism in a lens barrel apparatus according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a camera according to an embodiment of the present invention.

Icon: 1-a lens body; 2-a lens mount; 3-a sensor circuit board; 4-an adjustment mechanism; 5-an optical filter; 6-a rotating mechanism; 7-a scaffold; 8, a motor; 9-a housing; 10-a connecting assembly; 11-a cover plate; 12-an output shaft; 13-a first gear; 14-a second gear; 15-opening; 16-a via; 17-optical filter day and night switching mechanism; 18-a front shell; 19-rear cylinder; 20-mounting a plate; 21-lens movement device.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

Fig. 1 is a schematic structural diagram of a lens barrel apparatus according to an embodiment of the present invention; fig. 2 is an exploded view of a lens barrel apparatus according to an embodiment of the present invention, and as shown in fig. 1 and fig. 2, a lens barrel apparatus 21 according to an embodiment of the present invention includes a lens body 1, a lens mount 2, a sensor circuit board 3, an adjustment mechanism 4, and a plurality of filters 5 having different thicknesses; wherein each filter 5 is adapted for a different object distance range; the lens mount 2 is mounted on the sensor circuit board 3; the lens body 1 is arranged on the lens base 2; the adjusting mechanism 4 is used for driving each optical filter 5 to be sequentially aligned with the lens body 1 so as to acquire and fuse the clear parts of the images acquired by the optical filters 5.

Before working, the lens movement device 21 provided in this embodiment selects a plurality of optical filters 5 suitable for different object distance ranges, and installs the optical filters 5 in the adjusting mechanism 4; when the lens is in work, the adjusting mechanism 4 is started to sequentially drive each optical filter 5 to align with the lens body, so that the sensor circuit board 3 acquires and fuses the clear parts of the images acquired by the optical filters 5, and an image picture with different depths of field and clearness is acquired; when the object distance of the shot image changes, the adjusting mechanism 4 can still drive each optical filter 5 to be aligned with the lens body in sequence, so that the corresponding clear part of each optical filter 5 changes, the image finally fused by the sensor circuit board 3 also changes, and the finally obtained image still has different depth of field and is clear.

Therefore, the lens movement device 21 can acquire clear image pictures with different depth of field by driving each optical filter 5 to align with the lens body in sequence and acquiring and fusing clear parts of images acquired by the optical filters 5 through the sensor circuit board 3, and does not need to be provided with the voice coil motor lens mount 2 or a targeted development drive circuit, so that the cost is saved; in addition, even if the object distance of the shot image is changed, the image finally generated by fusion of the sensor circuit board 3 is still clear, so that real-time focusing of the same picture with different depths of field can be realized.

The following describes the selection of the plurality of filters 5 with different thickness differences by a specific calculation method:

the following can be known through Gauss's law: 1/U +1/V is 1/f; wherein U is the object distance, V is the distance, and f is the focal length; calculating by using the lens parameters universal in the security industry at present, taking f (focal length) as 8mm, FNO (relative aperture) as 1, and taking the thickness of the optical filter as 0.2 mm;

counting the general requirements of the industry, taking an application scene of 0.5-50 m as an example, the following steps are carried out:

when the object distance is 0.5 m, focusing is performed: v is 1/(1/f-1/U) is 8.13 mm;

the object distance is 50 meters for focusing: v is 1/(1/f-1/U) is 8.01 mm;

it can be known that the optical path compensation amount required by the optical filter is: 8.13mm-8.01mm ═ 0.12 mm.

Fig. 3 is a schematic diagram illustrating a relationship between an optical angle and an optical path compensation amount of an optical filter in a lens barrel apparatus according to an embodiment of the present invention; when a light beam is inserted into a filter with a thickness d, the optical path is changed, n is the refractive index, L is the compensation amount, θ is the incident angle, r is the refraction angle, as shown in fig. 3, then:

A’B’＝Lsinθ；AA’＝d/cosr；

in triangle AA 'B': a ' B '/AA ' ═ sin (θ -r);

the mixture is obtained by finishing the raw materials,

the mixture is obtained by finishing the raw materials,

when the incident angle and the refraction angle are small, sin θ ═ tan θ, that is:

finishing to obtain: l ═ d (1-1/n);

therefore, it is deduced that: compensation amount ═ difference in glass thickness (1-1/refractive index);

then, the following is deduced: the glass thickness difference is the optical path length compensation amount/(1-1/refractive index).

Then, the refractive index of the general glass is 1.52, the thickness of the optical filter is 0.2mm, and the optical path compensation amount required by the optical filter is 0.12mm, which are substituted into the formula, so that the following can be calculated: the difference in glass thickness is: 0.12/(1-1/1.52) ═ 0.35 mm;

taking four filters as an example, the thicknesses of the four filters can be 0.2mm, 0.32mm, 0.44mm and 0.56mm respectively;

it should be noted that, in this embodiment, only four filters 5 with different specifications are set as an example; specifically, the number of the filters 5 may be selected according to actual conditions, for example, three or five filters may be used, and the number is not limited.

In addition, the lens deck device 21 may be further provided with a filter day and night switching mechanism 17, and the filter day and night switching mechanism 17 is mounted on the sensor circuit board 3 to ensure that the lens deck device 21 can satisfy the photographing effect no matter in the day or at night.

Also, the sensor circuit board 3 may be connected to a computer signal to perform acquisition and fusion of a plurality of images.

As an alternative embodiment, the adjusting mechanism 4 is a rotating mechanism 6; the rotating mechanism 6 comprises a bracket 7, and the bracket 7 is used for mounting a plurality of optical filters 5; the rotating mechanism 6 is used for driving the plurality of optical filters 5 to rotate so that each optical filter 5 is aligned with the lens body 1 in sequence.

In this embodiment, before shooting, the rotating mechanism 6 is started to make the bracket 7 drive the plurality of optical filters 5 to rotate, and each optical filter 5 is sequentially rotated to be aligned with the lens body 1.

If there are four filters 5, for example, each image frame needs 25 frames per second, each image frame needs 40ms, and therefore the time consumed for rotating each filter 5 is 10ms at most, and the rotation speed of the rotation mechanism needs to be greater than 0.025 rpm/ms.

Fig. 4 is a schematic structural diagram of an adjusting mechanism in a lens barrel movement apparatus according to an embodiment of the present invention; fig. 5 is an exploded view of a structure of a rotating mechanism in a lens barrel apparatus according to an embodiment of the present invention; as shown in fig. 4 and 5, as an alternative embodiment, the rotating mechanism 6 further includes a motor 8, a housing 9, a connecting assembly 10, and a cover plate 11; the motor 8 is fixedly connected with the outer side of the shell 9, and an output shaft 12 of the motor 8 penetrates through the shell 9; the connecting assembly 10 is respectively connected with the output shaft 12 and the bracket 7, and the connecting assembly 10 is used for driving the bracket 7 to rotate along with the rotation of the output shaft 12; the housing 9 and the cover plate 11 form a containing cavity for containing the connecting assembly 10, the bracket 7 and the optical filter 5.

In this embodiment, when the optical filter 5 is selected, the motor 8 is first started, the output shaft 12 of the motor 8 drives the connecting assembly 10 to rotate, and the connecting assembly 10 drives the bracket 7 and the optical filters 5 mounted on the bracket 7 to rotate together until the selected optical filter 5 rotates to be aligned with the lens body 1.

Referring to fig. 5, as an alternative embodiment, the connecting assembly 10 includes a first gear 13, a second gear 14, and a rotating shaft; the first gear 13 is in interference fit with the output shaft 12 and can rotate by taking the output shaft 12 as an axis; the second gear 14 is mounted to the housing 9 by a rotary shaft, and the second gear 14 is fixedly connected to the bracket 7.

In this embodiment, when the optical filter 5 is selected, the motor 8 is started first, and since the first gear 13 is in interference fit with the output shaft 12, the output shaft 12 of the motor 8 drives the first gear 13 to rotate; since the second gear 14 is mounted on the housing 9 through the rotating shaft, and the slot on the second gear 14 is meshed with the first gear 13, when the first gear 13 rotates, the second gear 14 is driven to rotate; since the second gear 14 is fixedly connected to the holder 7, it is possible to realize that the plurality of filters 5 mounted to the holder 7 rotate together until each filter 5 is sequentially rotated to be aligned with the lens body 1.

With continued reference to FIG. 5, as an alternative embodiment, the cover plate 11 has an opening 15 therein; the opening 15 is used to expose one filter 5.

Referring to fig. 2, the lens holder 2 has a through hole 16 passing through itself; the lens and the through hole 16 are arranged corresponding to the opening 15; the through hole 16 forms an optical path to align the filter 5 exposed to the opening 15 with the lens body 1.

In this embodiment, the openings 15 and the through holes 16 are provided to align the positioned optical filter 5 with the lens body 1 and to be located in the optical channel, so as to satisfy the shooting condition.

The embodiment of the invention also provides an optical instrument which comprises any one of the lens movement devices 21.

In this embodiment, the beneficial effects of the optical instrument are the same as those of any of the above-mentioned lens movement devices 21, and are not described again.

Fig. 6 is a schematic structural diagram of a camera according to an embodiment of the present invention, and as shown in fig. 6, the embodiment of the present invention further provides a camera, where the camera includes a front housing 18, a lens movement device 21, and a rear barrel 19; the front shell 18 and the rear barrel 19 cooperate to house a lens movement device 21; the lens movement device 21 is fixed to the rear barrel 19 of the camera by a mounting plate 20.

In this embodiment, the front case 18 and the rear barrel 19 can protect the lens movement device 21, and the mounting plate 20 can more stably mount the lens movement device 21.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (9)

1. A lens movement device is characterized by comprising a lens body, a lens seat, a sensor circuit board, an adjusting mechanism and a plurality of optical filters with different thicknesses; wherein the content of the first and second substances,

each filter is suitable for different object distance ranges;

the lens mount is mounted on the sensor circuit board, the lens body is mounted on the lens mount, the optical filters are mounted on the adjusting mechanism, and the adjusting mechanism is mounted on the lens mount;

the adjusting mechanism is used for driving each optical filter to be sequentially aligned with the lens body so as to acquire and fuse a plurality of clear parts of the images acquired by the optical filters.

2. A lens movement device according to claim 1, wherein the adjustment mechanism is a rotation mechanism;

the rotating mechanism comprises a bracket for mounting the plurality of optical filters;

the rotating mechanism is used for driving the optical filters to rotate so as to enable each optical filter to be aligned with the lens body in sequence.

3. The lens movement device according to claim 2, wherein the rotation mechanism further comprises a motor, a housing, a connection member, and a cover plate;

the motor is fixedly connected with the outer side of the shell, and an output shaft of the motor penetrates through the shell;

the connecting assembly is respectively connected with the output shaft and the bracket, and the connecting assembly is used for driving the bracket to rotate along with the rotation of the output shaft;

the shell with the apron constitutes and holds the chamber, it is used for holding to hold the chamber coupling assembling the support reaches the light filter.

4. A lens movement device according to claim 3, wherein the connecting assembly includes a first gear, a second gear, and a rotation shaft;

the first gear is in interference fit with the output shaft and can rotate by taking the output shaft as an axis;

the second gear is mounted on the shell through the rotating shaft, and the second gear is fixedly connected with the support.

5. A lens movement device according to claim 3, wherein the cover plate has an opening therein;

the opening is used for exposing one optical filter.

6. A lens movement device according to claim 4, wherein said lens holder has a through hole passing through itself;

the lens and the through hole are arranged corresponding to the opening;

the through hole forms an optical channel to align the optical filter exposed to the opening with the lens body.

7. An optical instrument comprising a lens movement device according to any one of claims 1 to 6.

8. A camera characterized by comprising a front case, a lens barrel movement device according to any one of claims 1 to 6, and a rear barrel;

the front shell and the rear barrel cooperate to accommodate the lens movement device.

9. The camera of claim 8, wherein the lens movement device is secured to a rear barrel of the camera by a mounting plate.

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