阅读说明：本技术 3d视觉环境光抑制成像方法 (3D visual environment light inhibition imaging method ) 是由 杨国辉 初冬梅 路钧杰 于 2021-07-26 设计创作，主要内容包括：本发明公开了3D视觉环境光抑制成像方法,涉及相机采光成像技术领域,解决了现有的相机,不能在摔落撞击时对镜头采光口中的滤光镜片进行罩挡保护,造成滤光镜片易被硬物戳破损坏的问题。3D视觉环境光抑制成像方法,包括相机；所述相机包括镜头,所述相机的前端中心处设置有一处可伸缩的镜头,此镜头圆周外围的机壳上锁紧安装有一处安装环；所述安装环包括定位轴,六处定位轴呈环形阵列支撑焊接于安装环上,且六处安装环上通过弹簧顶推滑动套装有一处滑动圈。本发明的六处摆杆利用触地冲击力触发驱使内摆,具有较好的反应及时性,使六处摆杆在发生摔落事故的一瞬间就能够被触发摆转进行遮挡保护,对应镜头的保护效果较佳。(The invention discloses a 3D visual environment light inhibition imaging method, relates to the technical field of camera lighting imaging, and solves the problem that an existing camera cannot cover and protect a filter lens in a lens lighting port when falling and impacting, so that the filter lens is easily punctured and damaged by a hard object. A3D visual ambient light suppression imaging method comprises a camera; the camera comprises a lens, a telescopic lens is arranged at the center of the front end of the camera, and a mounting ring is arranged on a casing on the periphery of the circumference of the lens in a locking manner; the mounting ring comprises positioning shafts, six positioning shafts are in annular array support welding on the mounting ring, and a sliding ring is sleeved on the six mounting rings in a sliding mode through spring pushing. The six oscillating bars trigger to drive the inner pendulum by using the impact force of touching the ground, so that the six oscillating bars have better response timeliness, can be triggered to swing to carry out shielding protection at the moment of falling accidents, and have better protection effect corresponding to a lens.)

The 3D visual environment light inhibition imaging method is characterized by comprising the following steps: a camera, comprising

A camera; the camera comprises a lens, a telescopic lens is arranged at the center of the front end of the camera, and a mounting ring is arranged on a casing on the periphery of the circumference of the lens in a locking manner;

a mounting ring; the mounting ring comprises positioning shafts, six positioning shafts are supported and welded on the mounting ring in an annular array manner, and a sliding ring is sleeved on the six mounting rings in a sliding manner through spring pushing;

a sliding ring; the sliding ring comprises a front convex shaft rod and a track ring, six front convex shaft rods are arranged on the circumferential inner wall of the sliding ring in a surrounding mode, the track ring is welded to the front end sections of the six front convex shaft rods, a stress ring is welded to the foremost ends of the six front convex shaft rods, and a gear ring is rotatably mounted inside the track ring.

2. The 3D visual ambient light suppression imaging camera of claim 1, characterized in that: the mounting ring further comprises a triangular top frame, and two triangular top frames are supported and welded at the centers of the six positioning shafts in a left-right opposite direction towards the mounting ring at the front ends of two corresponding positions up and down.

3. The 3D visual ambient light suppression imaging camera of claim 1, characterized in that: the sliding ring further comprises an inserted rod, and a T-shaped inserted rod is inserted in the front side wall at the top end of the track ring in a penetrating mode through the pushing of a spring.

4. The 3D visual ambient light suppression imaging camera of claim 1, characterized in that: the gear ring comprises

The retaining rod is welded on the inner annular end surface of the gear ring in a surrounding manner, and the number of the retaining rods is six;

two rear convex stay bars are symmetrically welded on two retaining bars which are vertically corresponding, and the head ends of the two rear convex stay bars are respectively and rotatably provided with a guide wheel.

5. The 3D visual ambient light suppression imaging camera of claim 1, characterized in that: the force-bearing ring comprises

The inner wall of the circumference of the stress ring is circularly and rotatably connected with six swing rods;

the driven gear is sleeved at the rear end of the rotating shaft at the tail of the six swing rods.

6. The 3D visual ambient light suppression imaging camera of claim 4, characterized in that: when the stress ring is impacted and slides backwards, two guide wheels on two rear convex support rods correspondingly push and roll to contact with the bevel edges of two triangular top frames.

7. The 3D visual ambient light suppression imaging camera of claim 4, characterized in that: six holding rods are correspondingly matched with the annular track groove in the track ring in a rotating mode.

8. The 3D visual ambient light suppression imaging camera of claim 5, characterized in that: and a circle of driven gears is arranged towards the track ring support at six positions, and correspondingly meshed and contacted with the gear ring.

9. The 3D visual ambient light suppression imaging camera of claim 2, characterized in that: the bottom section of the T-shaped inserted rod is of a beveling structure, and the bottom beveling section of the T-shaped inserted rod is correspondingly matched with the gear ring in an inserting mode.

10. The 3D visual ambient light suppression imaging method according to claim 1, characterized by: the method comprises the following steps:

1. acquiring a primary surface image of a detected target by using a camera 1, and processing to obtain a primary three-dimensional point cloud picture;

2. the laser module projects high-resolution red stripe structured light codes to a detected target, and a camera 1 is adopted to filter out white light so as to obtain corresponding red light code surface images;

3. scanning for 16 times within 0.7 second to obtain a corresponding red light coding surface image; obtaining a fused red light surface image of the camera 1;

4. acquiring a red light three-dimensional point cloud picture according to the fused red light surface image; and overlapping the red light three-dimensional point cloud picture and the primary three-dimensional point cloud picture to obtain a complete three-dimensional point cloud picture.

Technical Field

The invention relates to the technical field of camera lighting imaging, in particular to a 3D visual ambient light inhibition imaging method.

Background

With the increasing abundance of production and life, people like to record some good pictures by using cameras, so that the cameras become indispensable necessities of people gradually. The camera generally comprises a shell, a lens and an image sensing module, wherein the lens and the image sensing module are arranged in the shell, the image sensing module comprises a circuit main board and an image sensor electrically connected with the circuit main board, a shot scene is imaged in the image sensor through the lens, and the datamation of signals is completed through a circuit board so as to be transmitted to a storage card for storage.

For example, patent No. CN201720160389.5 discloses a lens assembly and a camera, the lens assembly includes a lens, a fixed adjusting piece, a mounting piece and a fixing piece arranged on the lens, the fixed adjusting piece includes an adjusting portion and a connecting portion, the connecting portion deviates from the adjusting portion one end with the fixing piece is connected and is formed the accommodating space of the lens, the mounting piece with the shell of the camera is connected, the mounting piece deviates from one end connected with the shell of the camera and is provided with an installation cavity, the adjusting portion is installed in the installation cavity. According to the invention, the mounting part is connected with the shell of the camera to fix the adjusting part, the fixing adjusting part is provided with a connecting part which is connected with the fixing part on the lens, and the lens is fixed by the fixing adjusting part and the fixing part, so that the lens is fixed without shaking; the lens components are compactly arranged, the overall length of the lens is shortened, and the overall volume of the lens components is reduced.

The existing cameras cannot effectively inhibit ambient light, the imaging method is not good enough, a complete three-dimensional point cloud picture cannot be obtained, and although some cameras are provided with landing buffer protection mechanisms for lenses, most of the buffer mechanisms are mainly used for protecting the lens bodies, and the filter lenses in the lens daylighting ports cannot be covered and protected when falling and impacting, so that the filter lenses are easily punctured and damaged by hard objects.

Disclosure of Invention

The invention aims to provide a 3D visual environment light inhibition imaging method, which aims to solve the problem that the filter lens is easily punctured and damaged by a hard object because the filter lens in a lens daylighting port cannot be shielded and protected when a user falls and impacts in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a D visual ambient light suppression imaging method comprises a camera; the camera comprises a lens, a telescopic lens is arranged at the center of the front end of the camera, and a mounting ring is arranged on a casing on the periphery of the circumference of the lens in a locking manner; a mounting ring; the mounting ring comprises positioning shafts, six positioning shafts are supported and welded on the mounting ring in an annular array manner, and a sliding ring is sleeved on the six mounting rings in a sliding manner through spring pushing; a sliding ring; the sliding ring comprises a front convex shaft rod and a track ring, six front convex shaft rods are arranged on the circumferential inner wall of the sliding ring in a surrounding mode, the track ring is welded to the front end sections of the six front convex shaft rods, a stress ring is welded to the foremost ends of the six front convex shaft rods, and a gear ring is rotatably mounted inside the track ring.

Preferably, the mounting ring further comprises a triangular top frame, and two triangular top frames are supported and welded at two front ends of the six positioning shafts which correspond to each other up and down and face the center of the mounting ring in a left-right opposite mode.

Preferably, the sliding ring further comprises an insertion rod, and a T-shaped insertion rod is inserted through the front side wall at the top end of the track ring in a pushing and penetrating manner through a spring.

Preferably, the ring gear comprises

The retaining rod is welded on the inner annular end surface of the gear ring in a surrounding manner, and the number of the retaining rods is six;

two rear convex stay bars are symmetrically welded on two retaining bars which are vertically corresponding, and the head ends of the two rear convex stay bars are respectively and rotatably provided with a guide wheel.

Preferably, the force ring comprises

The inner wall of the circumference of the stress ring is circularly and rotatably connected with six swing rods;

the driven gear is sleeved at the rear end of the rotating shaft at the tail of the six swing rods.

Preferably, when the stressed ring is impacted and slides backwards, two guide wheels on two rear convex support rods correspondingly push and roll to contact with the bevel edges of two triangular top frames.

Preferably, a total of six said retaining rods are correspondingly in rotary engagement with an annular track groove in the interior of the track ring.

Preferably, a total of six driven gears are arranged towards the track ring support, and one driven gear is correspondingly in meshing contact with the gear ring.

Preferably, the bottom section of the T-shaped inserted bar is of a beveling structure, and the bottom beveling section of the T-shaped inserted bar is correspondingly matched with the gear ring in an inserting mode.

Preferably, the method comprises the following steps:

1. acquiring a primary surface image of a detected target by using a camera 1, and processing to obtain a primary three-dimensional point cloud picture;

2. the laser module projects high-resolution red stripe structured light codes to a detected target, and a camera 1 is adopted to filter out white light so as to obtain corresponding red light code surface images;

3. scanning for 16 times within 0.7 second to obtain a corresponding red light coding surface image; obtaining a fused red light surface image of the camera 1;

4. acquiring a red light three-dimensional point cloud picture according to the fused red light surface image; and overlapping the red light three-dimensional point cloud picture and the primary three-dimensional point cloud picture to obtain a complete three-dimensional point cloud picture.

Compared with the prior art, the invention has the beneficial effects that:

1. when the camera accidentally falls to the ground, the stress ring can be sleeved with the cover to support and protect the lens, so that the lens is prevented from being directly impacted and contacted with the ground, the probability of damaging the lens is reduced, and the stress ring can compress a ring of springs on the positioning shaft to buffer the impact force when being impacted by the ground, so that the impact oscillation on the lens is reduced;

2. according to the invention, by adopting the inclined plane guide principle, when the force bearing ring touches the ground and impacts to drive the gear ring and the two retaining rods to slide backwards, the gear ring can be guided by the inclined planes of the two triangular top frames to drive torsion, the gear ring can be meshed to drive a circle of driven gear and six oscillating bars to synchronously swing and rotate and be arranged in the force bearing ring to shield the filter glass sheet in the lens, the filter glass sheet is prevented from being stabbed and broken by hard objects, the integrity of the lens is effectively protected, the six oscillating bars trigger and drive the inner pendulum by using the touch impact force, the reaction timeliness is better, the six oscillating bars can be triggered to swing and rotate for shielding protection at one moment of a falling accident, and the protection effect corresponding to the lens is better;

3. according to the invention, by adopting the inclined plane guide principle, the bottom inclined section of the T-shaped insert rod can be used for inserting and positioning the gear ring in real time, so that the gear ring is kept in an impact torsion state and six swing rods are kept in an inward rotation shielding use state;

4. according to the invention, a spring is hung and supported between the rear convex support rod at the top end and the positioning shaft on the right side of the rear convex support rod, after the T-shaped inserted rod is loosened, the spring can automatically pull the gear ring to return to the original position and enable the six swing rods to be in rotary contact with the inner wall of the stress ring (as shown in figure 1), and the six swing rods in the contraction contact state can empty the inner space of the stress ring, so that the blocking of the shooting visual field of a lens is avoided;

5. acquiring a primary surface image of a detected target by using a camera, and processing to obtain a primary three-dimensional point cloud picture; the laser module projects high-resolution red stripe structured light codes to a detected target, and a camera is adopted to filter out white light so as to obtain corresponding red light code surface images; scanning for 16 times within 0.7 second to obtain a corresponding red light coding surface image; obtaining a fused red light surface image of a camera; acquiring a red light three-dimensional point cloud picture according to the fused red light surface image; and overlapping the red light three-dimensional point cloud picture and the primary three-dimensional point cloud picture to obtain a complete three-dimensional point cloud picture.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the present invention with the collar removed;

FIG. 3 is a schematic view of a mounting ring structure of the present invention;

FIG. 4 is a schematic view of the back structure of the mounting ring of the present invention;

FIG. 5 is a schematic view of a sliding ring structure according to the present invention;

FIG. 6 is a schematic view of the back structure of the sliding ring of the present invention;

FIG. 7 is a schematic view of a ring gear configuration of the present invention;

FIG. 8 is an enlarged view of portion A of FIG. 3 according to the present invention;

FIG. 9 is an enlarged view of portion B of FIG. 5 according to the present invention;

FIG. 10 is a flow chart of an imaging method of the present invention;

in the drawings, the corresponding relationship between the component names and the reference numbers is as follows:

1. a camera; 101. a lens; 2. a mounting ring; 201. positioning the shaft; 202. a triangular top frame; 3. a sliding ring; 301. a forward nose shaft lever; 302. a track ring; 303. inserting a rod; 4. a ring gear; 401. a holding rod; 402. a rear convex stay bar; 5. a stress ring; 501. a swing rod; 502. a driven gear.

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.

Referring to fig. 1 to 10, embodiment 1 of the present invention: A3D visual ambient light suppression imaging method includes a camera 1; the camera 1 comprises a lens 101, wherein a telescopic lens 101 is arranged at the center of the front end of the camera 1, and a mounting ring 2 is arranged on a shell on the periphery of the circumference of the lens 101 in a locking manner;

a mounting ring 2; the mounting ring 2 comprises positioning shafts 201, six positioning shafts 201 are supported and welded on the mounting ring 2 in an annular array manner, and a sliding ring 3 is sleeved on the six mounting rings 2 in a sliding manner through spring pushing;

a sliding ring 3; the sliding ring 3 comprises a front convex shaft rod 301 and a track ring 302, six front convex shaft rods 301 are arranged on the circumferential inner wall of the sliding ring 3 in a surrounding mode, the track ring 302 is welded on the front end sections of the six front convex shaft rods 301, a stress ring 5 is welded and fixed to the foremost ends of the six front convex shaft rods 301, and a gear ring 4 is rotatably installed inside the track ring 302.

Referring to fig. 3, the mounting ring 2 further includes a triangular top frame 202, two front ends of two corresponding positions of the six positioning shafts 201 are supported and welded at two positions of the center of the mounting ring 2 in a left-right opposite direction, and the mounting ring 2 is used for locking and fixing the sliding ring 3 and the camera 1 together.

Referring to fig. 5, the sliding ring 3 further includes an insertion rod 303, and a T-shaped insertion rod 303 is inserted through the front side wall of the top end of the track ring 302 by a spring.

Referring to fig. 7, the ring gear 4 includes

A retaining rod 401, wherein six convex retaining rods 401 are circumferentially welded on the inner annular end surface of the gear ring 4;

two rear convex stay bars 402 are symmetrically welded on two retaining bars 401 corresponding to each other up and down, and the head ends of the two rear convex stay bars 402 are respectively provided with a guide wheel in a rotating manner.

Referring to FIG. 3, the force ring 5 includes

The swing rod 501 is connected with six swing rods 501 on the circumferential inner wall of the stress ring 5 in a surrounding and rotating manner;

the driven gear 502 and the driven gear 502 are sleeved at the rear ends of the rotating shafts at the tail parts of the six swing rods 501, when the camera 1 falls to the ground carelessly, the stress ring 5 can be sleeved with a cover to support and protect the lens 101, the lens 101 is prevented from being directly contacted with the ground in an impact manner, the probability that the lens 101 is broken is reduced, and the stress ring 5 can compress a spring on the circle of positioning shaft 201 to buffer the impact force when the stress ring 5 is impacted by the ground, so that the impact oscillation to the lens 101 is reduced.

Referring to fig. 3, when the force-bearing ring 5 is impacted and slides backwards, two guide wheels on two rear convex support rods 402 are correspondingly in pushing rolling contact with the bevel edges of two triangular top frames 202, according to the principle of bevel guide, when the force-bearing ring 5 touches the ground and impacts to drive the gear ring 4 and two retaining rods 401 to slide backwards, the gear ring 4 can be guided by the bevel edges of the two triangular top frames 202 to drive torsion, the gear ring 4 can be twisted to engage and drive a circle of driven gear 502 and six swing rods 501 to synchronously swing and arrange inside the force-bearing ring 5 to shield the filter glass inside the lens 101, so that the filter glass is prevented from being broken by a hard object, the integrity of the lens 101 is effectively protected, and the six swing rods 501 trigger and drive the inner swing by the impact force of touching the ground, so that the six swing rods 501 can be triggered and swung to shield and protect at the moment of a falling accident, and the protection effect corresponding to the lens 101 is good.

Referring to fig. 6, a total of six retaining rods 401 are correspondingly rotationally engaged with the annular track groove in the track ring 302.

Referring to fig. 6, a total of six driven gears 502 are supported and mounted toward the track ring 302, and a ring of the driven gears 502 is in meshing contact with the ring gear 4.

Referring to fig. 5, the bottom section of the T-shaped insertion rod 303 is of a bevel structure, and the bottom bevel section of the T-shaped insertion rod 303 is correspondingly matched with the gear ring 4 in an inserting manner, and according to the bevel guiding principle, the bottom bevel section of the T-shaped insertion rod 303 can position the gear ring 4 in an inserting manner in real time, so that the gear ring 4 is kept in an impact torsion state and the six swing rods 501 are kept in an inward rotation shielding use state.

Referring to fig. 10, the method includes the steps of:

1. acquiring a primary surface image of a detected target by using a camera 1, and processing to obtain a primary three-dimensional point cloud picture;

2. the laser module projects high-resolution red stripe structured light codes to a detected target, and a camera 1 is adopted to filter out white light so as to obtain corresponding red light code surface images;

3. scanning for 16 times within 0.7 second to obtain a corresponding red light coding surface image; obtaining a fused red light surface image of the camera 1;

4. acquiring a red light three-dimensional point cloud picture according to the fused red light surface image; and overlapping the red light three-dimensional point cloud picture and the primary three-dimensional point cloud picture to obtain a complete three-dimensional point cloud picture.

Referring to fig. 1 to 10, embodiment 2 of the present invention: A3D visual ambient light suppression imaging method includes a camera 1; the camera 1 comprises a lens 101, wherein a telescopic lens 101 is arranged at the center of the front end of the camera 1, and a mounting ring 2 is arranged on a shell on the periphery of the circumference of the lens 101 in a locking manner;

a mounting ring 2; the mounting ring 2 comprises positioning shafts 201, six positioning shafts 201 are supported and welded on the mounting ring 2 in an annular array manner, and a sliding ring 3 is sleeved on the six mounting rings 2 in a sliding manner through spring pushing;

a sliding ring 3; the sliding ring 3 comprises a front convex shaft rod 301 and a track ring 302, six front convex shaft rods 301 are arranged on the circumferential inner wall of the sliding ring 3 in a surrounding mode, the track ring 302 is welded on the front end sections of the six front convex shaft rods 301, a stress ring 5 is welded and fixed to the foremost ends of the six front convex shaft rods 301, and a gear ring 4 is rotatably installed inside the track ring 302.

Referring to fig. 3, the mounting ring 2 further includes a triangular top frame 202, and two corresponding upper and lower front ends of the six positioning shafts 201 are supported and welded at two triangular top frames 202 in left and right opposite directions toward the center of the mounting ring 2.

Referring to fig. 5, the sliding ring 3 further includes an insertion rod 303, and a T-shaped insertion rod 303 is inserted through the front side wall of the top end of the track ring 302 by a spring.

Referring to fig. 7, the ring gear 4 includes

A retaining rod 401, wherein six convex retaining rods 401 are circumferentially welded on the inner annular end surface of the gear ring 4;

two rear convex stay bars 402 are symmetrically welded on two retaining bars 401 corresponding to each other up and down, and the head ends of the two rear convex stay bars 402 are respectively provided with a guide wheel in a rotating manner.

Referring to FIG. 3, the force ring 5 includes

The swing rod 501 is connected with six swing rods 501 on the circumferential inner wall of the stress ring 5 in a surrounding and rotating manner;

the driven gear 502 and the rear ends of the rotating shafts at the tail parts of the six swing rods 501 are sleeved with one driven gear 502.

Referring to fig. 3, when the force-bearing ring 5 is impacted and slides backwards, two guide wheels on two rear convex support rods 402 correspondingly push and roll in contact with the bevel edges of two triangular top frames 202, a spring is hung and supported between the top rear convex support rod 402 and the positioning shaft 201 on the right side of the top rear convex support rod 402, after the T-shaped insertion rod 303 is loosened, the spring can automatically pull the gear ring 4 to return to the original position, so that six swing rods 501 are rotatably attached to the inner wall of the force-bearing ring 5 (as shown in fig. 1), and the six swing rods 501 in the retracted attached state can empty the inner space of the force-bearing ring 5, so as to avoid obstructing the shooting visual field of the lens 101.

Referring to fig. 6, a total of six retaining rods 401 are correspondingly rotationally engaged with the annular track groove in the track ring 302.

Referring to fig. 6, a total of six driven gears 502 are supported and mounted toward the track ring 302, and a ring of the driven gears 502 is in meshing contact with the ring gear 4.

Referring to fig. 5, the bottom section of the T-shaped insertion rod 303 is of a bevel structure, and the bottom bevel section of the T-shaped insertion rod 303 is correspondingly matched with the gear ring 4 in an inserting manner.

Referring to fig. 10, the method includes the steps of:

1. acquiring a primary surface image of a detected target by using a camera 1, and processing to obtain a primary three-dimensional point cloud picture;

2. the laser module projects high-resolution red stripe structured light codes to a detected target, and a camera 1 is adopted to filter out white light so as to obtain corresponding red light code surface images;

3. scanning for 16 times within 0.7 second to obtain a corresponding red light coding surface image; obtaining a fused red light surface image of the camera 1;

4. acquiring a red light three-dimensional point cloud picture according to the fused red light surface image; and overlapping the red light three-dimensional point cloud picture and the primary three-dimensional point cloud picture to obtain a complete three-dimensional point cloud picture.

The working principle is as follows: the mounting ring 2 is used for locking and fixing the sliding ring 3 and the camera 1 together, when the camera 1 falls to the ground accidentally, the stress ring 5 can be sleeved with a cover to support and protect the lens 101, so that the lens 101 is prevented from being in direct impact contact with the ground, the stress ring 5 can be used for buffering the impact force by compressing a spring on a circle of positioning shaft 201 through the sliding ring 3 when being impacted to the ground, through the inclined plane guide principle, the stress ring 5 can be guided by inclined planes of two triangular top frames 202 to drive the torsion when being impacted to the ground to drive the gear ring 4 and two holding rods 401 to slide backwards, the gear ring 4 can be twisted and meshed to drive a circle of driven gears 502 and six swing rods 501 to synchronously swing and rotate in the stress ring 5 to shield the optical filter glass inside the lens 101, and the optical filter glass is prevented from being broken by hard objects;

through the inclined plane direction principle, the bottom mitre section of T shape inserted bar 303 can be to real-time grafting location ring gear 4, make ring gear 4 keep impacting torsional state and make six departments pendulum rod 501 keep the user state of sheltering from in the adversion, it is provided with a spring to hang to prop between the location axle 201 on top rear protruding vaulting pole 402 and its right side, after loosening T shape inserted bar 303, this spring can be automatic with ring gear 4 pull gyration of gyration restoring to the throne and make six departments pendulum rod 501 gyration paste and lean on the inner wall of atress circle 5 (as shown in fig. 1), the shrink pastes six departments pendulum rod 501 that the state was leaned on and can vacate the inner space of atress circle 5, avoid sheltering from the shooting visual field that hinders camera lens 101.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.