CN213271681U

CN213271681U - Holder bracket for carrying out face recognition tracking based on mobile terminal equipment screen image

Info

Publication number: CN213271681U
Application number: CN202021794037.3U
Authority: CN
Inventors: 陈荣鑫
Original assignee: Shenzhen Xunshi Photoelectric Co ltd
Current assignee: Shenzhen Xunshi Photoelectric Co ltd
Priority date: 2020-08-25
Filing date: 2020-08-25
Publication date: 2021-05-25
Anticipated expiration: 2030-08-25

Abstract

The utility model provides a cloud platform support based on mobile terminal device screen image carries out face identification and trails, including supporting base, runner assembly, connecting the runner assembly and supporting the drive assembly of base and being used for controlling drive assembly's control system. The mobile terminal equipment comprises an APP remotely connected with the control system. The control system comprises a signal transmission and receiving module for receiving an angle change instruction sent by the mobile terminal equipment and a driving motor for controlling the transmission assembly to rotate according to the angle change instruction; the rotating assembly includes a support plate for supporting the mobile terminal device. The utility model discloses a set up signal transmission and the receiving module that can be connected with mobile terminal on the cloud platform support, the angle change instruction that APP on the real-time reception mobile terminal sent through backstage record screen to realize full-automatic rotation, have compatible strong, the high advantage of adjustment accuracy.

Description

Holder bracket for carrying out face recognition tracking based on mobile terminal equipment screen image

Technical Field

The utility model belongs to the technical field of mobile terminal equipment, especially, relate to a cloud platform support based on mobile terminal equipment screen image carries out face identification and trails.

Background

With the improvement of physical life of people, portable mobile devices such as tablet computers and mobile phones become a fashionable life style. The mobile devices such as tablet computers and mobile phones are very convenient to carry, but the only disadvantage is that no fixed pivot is available, and the reason why many people suffer from cervical spondylosis is also one of the reasons. In addition, in recent years, live broadcast and self-shooting behaviors become an integral part of life of people, live broadcast and self-shooting markets are increasingly expanded, the use frequency of video chat is increased, and a support capable of fixing a mobile phone or a tablet computer is urgently needed.

In the process of live broadcasting or recording images or videos, when the position of a recording object changes, a recording device is generally required to be moved to capture pictures following the recording object, or the recording device is required to be moved to continuously capture different pictures. The support is rotatable, which is important. However, the existing live broadcast support and self-photographing support have great limitations, such as incapability of automatically tracking a shot object, limitation on a rotation angle, and incapability of performing 360-degree horizontal rotation and vertical rotation; in addition, current rotating bracket equipment usually needs people to adjust the rotating bracket manually, and is very inconvenient when autodyne and live.

Therefore, it is urgently needed to provide a holder capable of automatically identifying and tracking an object to be photographed, and automatically rotating and capturing the object to be photographed. However, most of the existing cradle head supports capable of automatically rotating are provided with image capturing elements such as a camera on the support body to realize automatic tracking and recognition, and then the rotation of the support is controlled by a control system. By the arrangement, on one hand, the manufacturing cost of the holder bracket is increased; on the other hand, a certain distance deviation exists between the camera arranged on the bracket body and the camera of the mobile equipment on the bracket, and if the camera on the bracket body is used for identification and tracking adjustment, a certain adjustment deviation exists. Or the cloud platform support that can autogiration utilizes specific APP, calls the camera of cell-phone and follows the bat, but other shootings, video chat, live APP etc. that can't compatible user.

SUMMERY OF THE UTILITY MODEL

To the defect that above-mentioned prior art exists, the utility model aims to provide a cloud platform support that carries out face identification tracking based on mobile terminal device screen image. Through set up signal transmission and receiving module that can be connected with mobile terminal on the cloud platform support, the APP that can receive on the mobile terminal in real time records the angle change instruction that the screen sent through the backstage to realize full-automatic rotation, the user does not receive other APPs and uses the restriction, can use other live broadcast wantonly, the APP of making a video recording, compare accurate with the target personage of clapping through the people's face when many people environment at video chat, it is strong to have the compatibility, the adjustment precision is high, accurate advantage with clapping.

In order to achieve the above object, the utility model adopts the following technical scheme:

a cradle head support for carrying out face recognition tracking based on a screen image of mobile terminal equipment comprises a cradle head support body, wherein the cradle head support body comprises a supporting base, a rotating assembly, a transmission assembly and a control system, wherein the transmission assembly is connected with the rotating assembly and the supporting base;

the rotating assembly comprises a supporting plate for supporting the mobile terminal equipment;

the control system comprises a signal transmission and receiving module used for connecting and receiving an angle change instruction sent by the mobile terminal equipment, and a driving motor electrically connected with the signal transmission and receiving module and used for controlling the rotation of the transmission assembly according to the angle change instruction;

the mobile terminal equipment comprises an APP remotely connected with the signal transmission and receiving module, and the APP is used for sending an angle change instruction to the control system according to screen recording data of the mobile terminal equipment.

Further, the signal transmission and reception module includes a signal connection unit for connecting the mobile terminal device and a signal reception unit for receiving the angle change instruction sent by the mobile terminal device.

Further, the signal connection unit includes, but is not limited to, a wireless connection unit and/or a wired connection unit.

Further, the wireless connection unit includes, but is not limited to, a bluetooth connection unit and/or a WiFi connection unit; the wired connection unit is a USB connection unit.

Furthermore, the control system also comprises a control key and a power supply module; the control key is electrically connected with the power supply module through the key board, and the power supply module is electrically connected with the signal transmission and receiving module.

Furthermore, the transmission assembly comprises a bearing fixed at the upper end of the base through a bearing cover, a driving gear connected with a main shaft of the driving motor, and a driven gear arranged on an inner ring of the bearing, wherein the driving gear is meshed with the driven gear, and the driven gear is connected with the lower end of the holder.

Furthermore, the rotating assembly comprises a holder connected with the transmission assembly and a support frame assembly connected with the holder; the lower end of the cradle head is provided with a boss matched with the bearing inner ring, the boss is axially and fixedly connected with the driven gear, and the upper end of the cradle head is provided with a threaded hole matched with the support frame assembly.

Furthermore, the support frame assembly comprises a support frame connected with the holder through a first locking screw and a support plate connected with the support frame through a second locking screw, and the support plate can rotate relative to the support frame.

Further, the support frame includes upper end portion, lower tip and connects the support arm of upper end portion and lower tip, lower tip be provided with the through-hole that first locking screw suited, first locking screw passes the through-hole of lower tip with the cloud platform is connected, the upper end portion be provided with the through-hole that second locking screw suited, the second locking screw pass the through-hole of upper end portion with the backup pad is connected.

Furthermore, the upper end face of the holder is provided with a positioning hole for fixing the support frame, and the end face of the support frame on one side of the holder is provided with a positioning pin matched with the positioning hole.

Advantageous effects

Compared with the prior art, the utility model provides a cloud platform support based on mobile terminal device screen image carries out face identification and trails has following beneficial effect:

(1) the utility model provides a cloud platform support based on mobile terminal screen image carries out face identification and trails, through set up signal transmission and the receiving module that can be connected with mobile terminal on cloud platform support for cloud platform support's control system is connected with the mobile terminal remote control, installs the APP that has the screen and records and face identification and detect the function on the mobile terminal. According to the arrangement, a camera does not need to be additionally arranged on the holder support, so that the production cost is reduced, and compared with the prior art that the camera is arranged on the holder support, the problem that certain distance deviation exists between the camera arranged on the support body and the camera of the mobile equipment on the support, so that certain deviation exists in rotation regulation and control is solved; the APP records screen information at the back head, and then an angle change instruction occurs to a control system of the holder support, so that full-automatic rotation of the holder support is realized, and the APP has the advantages of strong compatibility and high adjustment precision.

(2) The utility model provides a cloud platform support based on mobile terminal screen image carries out face identification tracking acquires the cell-phone screen through APP at the background and records the screen and flow to face identification detects, the face comparison can compatible any live broadcast and video chat software, need not call cell-phone camera, because all live broadcasts, autodyne, interface such as video chat all have the image information of camera, do the instruction through gathering user's screen real-time display's content, the regulation and control precision is higher. In a multi-person environment of video chat, on the basis of face recognition, extracting the face features of a screen to be compared with the face information which is recorded and recognized and tracked, and if the face features are larger than a similarity threshold value, the face features are regarded as the same person. By the operation, the cloud deck can identify a tracking target through face comparison, and accurate tracking of a plurality of links is realized.

(3) The utility model provides a cloud platform support based on mobile terminal device screen image carries out face identification and trails, cloud platform support and mobile terminal device's connected mode can be for any kind or multiple connected mode in wireless connection and the limited connection, connect more conveniently, can accomplish the information highly uniform of information and the mobile device screen of discernment to show improvement mediation precision and convenience.

Drawings

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

FIG. 2 is a schematic structural view of the support base of the present invention with the housing removed;

fig. 3 is a schematic structural view of the transmission assembly of the present invention;

fig. 4 is a front view of the support frame assembly of the present invention;

fig. 5 is an exploded view of the support bracket assembly of the present invention;

fig. 6 is a front view of the cradle head of the present invention;

fig. 7 is a schematic structural view of the cradle head of the present invention;

fig. 8 is a schematic structural view of embodiment 2 of the present invention;

in the drawings, 1-a support base; 12-a control system; 120-a drive motor; 121-signal transmission and reception module; 122-control keys; 123-a keypad; 124-power supply module; 125-USB interface; 2-a transmission assembly; 21-a bearing; 22-a drive gear; 23-a driven gear; 3-a rotating assembly; 31-a pan-tilt; 311-boss; 312-locating holes; 32-a support frame assembly; 321-a support frame; 3212-a support arm; 3213-positioning pins; 322-first locking screw; 323-a support plate; 324-second locking screw.

Detailed Description

The technical solutions of the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments; based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1 to 7, a cradle head support for face recognition and tracking based on a screen image of a mobile terminal device includes a cradle head support body, where the cradle head support body includes a support base 1, a rotating component 3, a transmission component 2 connecting the rotating component 3 and the support base 1, and a control system for controlling the transmission component 2. The rotating component 3 comprises a cradle head 31 connected with the transmission component 2 and a support frame component 32 connected with the cradle head 31; the support frame assembly 32 includes a support plate 323 for supporting the mobile terminal device.

The mobile terminal equipment comprises an APP remotely connected with the control system, and the APP is used for sending an angle change instruction to the control system according to screen recording data of the mobile terminal equipment. Utilize APP to obtain the cell-phone screen at the background and record the screen stream, APP can analyze simultaneously that people's face humanoid, special object, pet wait for the position of catching the object, then send the angle change instruction to cloud platform support, realize tracking and the automatically regulated of cloud platform. The APP is high in compatibility and can be applied to android and iOS systems. The method for realizing screen recording of the android system comprises a mediaproject + virtual display method (after android 5.0 is released, google opens a screen capture interface, and acquisition of video source data for screen recording can be realized through the virtual display), a View. The method for realizing screen recording of the iOS system comprises the step of realizing screen recording through a Replaykit, wherein the Replaykit is a function provided by the iOS10 of the apple for screen recording and live broadcasting, in short, the apple recalls acquired screen video information to a developer through the function, and the developer can process the information at will. However, the Replaykit has a large upper limit value, and firstly, the system is required to be more than iOS 10; second, the App of the recorded screen must support the ReplayKit function.

Referring to fig. 2, in order to receive the angle change command sent by the control system, the control system includes a signal transmission and reception module 121 for connecting and receiving the angle change command sent by the mobile terminal device, and a driving motor 120 electrically connected to the signal transmission and reception module 121 and configured to control the rotation of the transmission assembly 2 according to the angle change command. The control system also includes control buttons 122 and a power module 124; the control key 122 is electrically connected to the power module 124 through a key sheet 123, and the power module 124 is electrically connected to the signal transmission and reception module 121. The power module 124 may be a rechargeable power source, and a power interface is further disposed on the back of the base 1, and the power module 124 supplies power to the driving motor 120 and the control system.

The signal transmission and reception module 121 includes a signal connection unit for connecting the mobile terminal device and a signal reception unit for receiving an angle change instruction sent by the mobile terminal device. The signal connection element comprises but is not limited to a wireless connection unit and/or a limited connection unit, and the wireless connection element comprises but is not limited to a Bluetooth connection unit and/or a WiFi connection unit; the limited connection is a USB connection unit (shown as USB interface 125 in fig. 2). The control system is mainly connected with an APP on the mobile terminal equipment through a signal connection unit, so that the APP can transmit signals such as an angle change instruction to the control system; the control system receives signals such as an angle change instruction transmitted by the mobile terminal device through a signal receiving unit, and then controls the movement of the driving motor 120, thereby controlling the rotation of the transmission assembly 2.

Particularly, the supporting base 1 comprises a bottom plate and a shell, wherein the bottom plate is connected with the shell through a buckle and is positioned below the shell; a cavity for accommodating the control system and the driving motor 120 is provided between the housing and the bottom plate. The driving motor 120 and the control system are located in the cavity, the driving motor 120 is fixedly connected with the shell, and the control system is fixedly connected with the bottom plate.

Referring to fig. 3, the transmission assembly 2 includes a bearing 21 fixed to the upper end of the support base 1 through a bearing cover, a driving gear 22 connected to a main shaft of the driving motor 120, and a driven gear 23 disposed at an inner ring of the bearing 21; the bearing 21 is positioned in the cavity and is fixedly connected with the upper part of the shell through a bearing cover, the shaft part of the driven gear 23 is arranged in the inner ring of the bearing 21 and is in interference fit with the inner ring of the bearing 21, namely the driven gear 23 can drive the inner ring of the bearing 21 to rotate when rotating; the driving gear 22 is engaged with the driven gear 23, the gear transmission is speed reduction transmission, and the driven gear 23 is connected with the lower end of the holder 31.

Particularly, a through hole adapted to the bearing 21 is further provided above the housing of the support base 1, that is, the diameter of the through hole is slightly larger than the diameter of the inner ring of the bearing 21, and a circular hole adapted to the control key 122 is provided on the front surface of the housing.

Referring to fig. 4 to 7, the rotating assembly 3 includes a pan/tilt head 31 connected to the transmission assembly 2 and a support frame assembly 32 connected to the pan/tilt head 31; the support frame assembly 32 includes a support plate 323 for supporting the mobile terminal device.

The bottom surface of the lower end cover of the holder 31 is provided with a boss 311 matched with the inner ring of the bearing 21, the end surface of the boss 311 is provided with a groove and a threaded hole, and the groove is used for positioning. The end face of the shaft part of the driven gear 23 is provided with a bulge corresponding to the groove and a through hole corresponding to the threaded hole. The boss 311 terminal surface joint is in on the drive gear 23 axial region terminal surface and fix through recess and protruding location and through connecting screw, the cloud platform 31 upper end be provided with support frame subassembly 32 adapted screw hole.

The support frame assembly 32 comprises a support frame 321 connected with the pan/tilt head 31 through a first locking screw 322 and a support plate 323 connected with the support frame 321 through a second locking screw 324, wherein the support plate 323 can rotate relative to the support frame 321, and is used for adjusting the angle of the support plate 323 in the vertical direction.

The support frame 321 includes upper end portion, lower tip and connects the support arm 3212 of upper end portion and lower tip, the lower tip be provided with the through-hole that first locking screw 322 nail suited, first locking screw 322 passes the through-hole of lower tip with cloud platform 31 is connected, the upper end portion be provided with the through-hole that second locking screw 324 suited, second locking screw 324 pass the through-hole of upper end portion with the backup pad 323 is connected. And the locking screw 322 is also provided with an anti-skid groove, so that the locking is convenient for users. The supporting plate 323 is further provided with a through hole used for being matched with other equipment, a mobile phone support, a gravity support or a flat support can be fixed through the through hole, the mobile phone support, the gravity support or the flat support can be matched with various different equipment, and the application range is wide.

Referring to fig. 6, the top of the upper end cover of the pan/tilt head 31 is provided with two positioning holes 312 for fixing the support frame, preferably, the connecting lines between the two positioning holes 312 and the axis of the pan/tilt head 31 are perpendicular and equal, one positioning hole 312 is located on one side of the front surface of the pan/tilt head 31, and the end surface of the support frame 321 located on one side of the pan/tilt head 31 is provided with a positioning pin 3213 adapted to the positioning hole 312; when the fixing device is installed, the positioning pin 3213 is matched with the positioning hole 312 to fix the supporting frame 321, so that the supporting frame 321 is prevented from rotating relative to the holder 31.

Following the utility model provides a cloud platform support's theory of operation based on mobile terminal device screen image carries out face identification and trails explains:

(1) the supporting and adjusting steps of the mobile terminal device of the android system are as follows:

s11, fixing mobile terminal equipment (provided with an APP with screen recording and face recognition detection functions) of an android system on a supporting plate 323 of a cradle head support, opening a signal connecting element of the cradle head support (for example, connecting through Bluetooth to transmit and receive signals), and remotely connecting a control system of the cradle head support with a mobile terminal of the android system;

s12, opening an APP in the mobile terminal equipment, requesting file reading and writing permission and screen recording permission, and clicking to determine to open the permission;

s13, acquiring a screen recording object mMediaProjection by the MediaProjectionManager, starting to record a screen, returning screen recording data, and calling a face recognition detection function to recognize the face change position;

s14, the APP is connected through the remote control and is sent an angle change instruction to the control system of the holder support, the signal receiving unit of the control system receives the instruction, the driving motor 120 controls the rotation of the transmission component 2, the transmission component 2 further controls the rotation of the rotation component 3, and finally the automatic rotation adjustment of the holder support is achieved.

(2) The supporting and adjusting steps of the mobile terminal device of the iOS system are as follows:

s21, fixing mobile terminal equipment (provided with an APP with functions of screen recording and face recognition detection) of an iOS system on a supporting plate 323 of the cradle head support, opening a signal transmission and receiving module of the cradle head support (for example, connecting through Bluetooth to transmit and receive signals), and remotely connecting a control system of the cradle head support with a mobile terminal of the android system;

s22, opening an APP in the mobile terminal equipment, requesting file reading and writing permission and screen recording permission, and clicking to determine to open the permission;

s23, displaying a view of the started video through an RPSystemBroadcastPickerView provided by a replaykit, starting a recording process only by clicking a button on the view, starting recording, returning screen recording data, and calling a face recognition detection function to recognize a face change position;

particularly, on the basis of face recognition, the face features of the screen are extracted and compared with the face information which is recorded and recognized and tracked, and if the face features are larger than the similarity threshold value, the face features are considered as the same person. By the operation, the cloud deck can identify the tracking target through face comparison, so that accurate tracking of a plurality of links is realized.

S24, the APP is connected through the remote control and is sent an angle change instruction to the control system of the holder support, the signal receiving unit of the control system receives the instruction, and the driving motor 120 controls the rotation of the transmission component 2, the transmission component 2 further controls the rotation of the rotation component 3, and finally the automatic rotation adjustment of the holder support is realized.

By adopting the technical scheme, the mobile phone screen recording stream is acquired at the background through the APP, and the face recognition detection and the face recognition comparison are carried out, so that the full-automatic rotation is realized, and the mobile phone screen recording stream has the advantages of strong compatibility and high adjustment precision. Any live broadcast and video chat software can be compatible, a mobile phone camera does not need to be called, all interfaces such as live broadcast, self-shooting and video chat have image information of the camera, and instructions are made by acquiring the content displayed on the screen of a user in real time, so that the regulation and control precision is higher.

Example 2

As shown in fig. 7, the structure principle of this embodiment is similar to that of embodiment 1, and the difference from embodiment 1 is that a circular truncated cone adapted to the support frame 321 is disposed in the middle of the support plate 323, a threaded hole matched with the locking screw 322 is disposed at the axis of the circular truncated cone, the support plate 323 and the support frame 321 are fixed by the locking screw 322, and through holes adapted to devices are disposed at two ends of the support plate 323.

During specific use, the positioning pin 3213 on the support frame 321 is disposed in the positioning hole 312 located on the front side of the pan/tilt head 31, and at this time, the support frame 321 is perpendicular to the front side of the pan/tilt head 31, and then a mobile phone clip and other devices can be installed on the support plate 323.

To sum up, the utility model provides a cloud platform support based on mobile terminal screen image carries out face identification tracking through set up signal transmission and the receiving module that can be connected with mobile terminal on cloud platform support, and APP that can receive in real time on the mobile terminal records the angle change instruction that the screen sent through the backstage to realize full-automatic rotation, have compatible strong, the high advantage of adjustment precision.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. A cradle head support for carrying out face recognition tracking based on a screen image of mobile terminal equipment comprises a cradle head support body, and is characterized in that the cradle head support body comprises a supporting base (1), a rotating assembly (3), a transmission assembly (2) for connecting the rotating assembly (3) with the supporting base (1), and a control system for controlling the transmission assembly (2);

the rotating assembly (3) comprises a supporting plate (323) for supporting the mobile terminal equipment;

the control system comprises a signal transmission and receiving module (121) for connecting and receiving an angle change instruction sent by the mobile terminal equipment, and a driving motor (120) electrically connected with the signal transmission and receiving module (121) and used for controlling the rotation of the transmission assembly (2) according to the angle change instruction;

the mobile terminal equipment comprises an APP remotely connected with the signal transmission and receiving module (121) and is used for sending an angle change instruction to the control system according to screen recording data of the mobile terminal equipment.

2. The cradle head support for face recognition and tracking based on screen image of mobile terminal device according to claim 1, wherein the signal transmission and reception module (121) comprises a signal connection unit for connecting the mobile terminal device and a signal reception unit for receiving angle change instruction sent by the mobile terminal device.

3. The cradle for face recognition and tracking based on screen image of mobile terminal device according to claim 2, wherein the signal connection unit includes but is not limited to a wireless connection unit and/or a wired connection unit.

4. The cradle for performing face recognition tracking according to claim 3, wherein the wireless connection unit includes but is not limited to a bluetooth connection unit and/or a WiFi connection unit; the wired connection unit is a USB connection unit.

5. The cradle for face recognition tracking based on screen image of mobile terminal device according to claim 1, wherein the control system further comprises a control button (122) and a power module (124); the control key (122) is electrically connected with the power supply module (124) through a key board (123), and the power supply module (124) is electrically connected with the signal transmission and reception module (121).

6. The cradle head support for face recognition and tracking based on screen image of mobile terminal device according to claim 1, wherein the transmission assembly (2) comprises a bearing (21) fixed on the upper end of the support base (1) through a bearing cover, a driving gear (22) connected with the main shaft of the driving motor (120), and a driven gear (23) arranged on the inner ring of the bearing (21), the driving gear (22) is engaged with the driven gear (23), and the driven gear (23) is connected with the lower end of the cradle head (31).

7. The cradle for face recognition and tracking based on screen image of mobile terminal device according to claim 6, wherein the rotating assembly (3) comprises a cradle head (31) connected to the transmission assembly (2) and a support frame assembly (32) connected to the cradle head (31); the lower end of the cradle head (31) is provided with a boss (311) matched with the inner ring of the bearing (21), the boss (311) is fixedly connected with the driven gear (23) in the axial direction, and the upper end of the cradle head (31) is provided with a threaded hole matched with the support frame assembly (32).

8. The cradle for performing face recognition and tracking according to claim 7, wherein the cradle head assembly (32) comprises a support frame (321) connected to the cradle head (31) through a first locking screw (322) and a support plate (323) connected to the support frame (321) through a second locking screw (324), and the support plate (323) can rotate relative to the support frame (321).

9. The cradle head support for face recognition and tracking based on screen images of mobile terminal devices according to claim 8, wherein the support frame (321) comprises an upper end portion, a lower end portion and a support arm (3212) connecting the upper end portion and the lower end portion, the lower end portion is provided with a through hole adapted to the first locking screw (322), the first locking screw (322) passes through the through hole of the lower end portion to be connected with the cradle head (31), the upper end portion is provided with a through hole adapted to the second locking screw (324), and the second locking screw (324) passes through the through hole of the upper end portion to be connected with the support plate (323).

10. The holder rack for face recognition and tracking based on screen images of mobile terminal devices according to claim 8, wherein the upper end face of the holder (31) is provided with a positioning hole (312) for fixing the support frame (321), and the end face of the support frame (321) on one side of the holder (31) is provided with a positioning pin (3213) corresponding to the positioning hole (312).