Mark detection device

Abstract

The utility model provides a mark detection device, which relates to the technical field of production and detection of needle products, and particularly comprises a conveying track, a carrier arranged on the conveying track, a fixing groove arranged on the carrier and used for being clamped with materials, and a detection mechanism, the detection mechanism is arranged on one side of the conveying track and comprises a detection piece and a lighting piece; the detection end of the detection piece faces the material; the illumination part is arranged on one side of the detection part, and the illumination direction of the illumination part faces the detection point of the detection part. When the carrier moves to the position opposite to the detection piece, the code printing position of the material is located at the monitoring point of the detection piece, the detection piece detects the code printing position of the material, the detection result is transmitted to the control end to be recorded, and a feeding conveying rail in a production line can be directly connected with the conveying rail in the automatic code printing device. The processed material is carried by the carrier and directly enters the mark detection device to be detected, so that the on-line instant and convenient detection of the material is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of needle product production and detection, in particular to a marking detection device. Background Art

[0002] The automatic assembly machine for needle products is a key equipment in modern medical machinery. The needle body is stored in a multi-needle injection needle after production and processing. After the needle body is processed and stored in the multi-needle injection needle, a code needs to be printed on the outer wall of the multi-needle injection needle to confirm that the production is completed.

[0003] At present, the coding of needle shells is all done by laser coding. The coding mechanism is not in the needle body production line. After all the processing of the needle body and the multi-needle injection needle is completed, the multi-needle injection needle with the needle body must be sent to the laser coding place separately to complete the laser coding operation. Therefore, after coding, it is impossible to perform online detection of the multi-needle injection needle in real time to check whether the coding is successful, and it is impossible to achieve real-time and convenient detection of the multi-needle injection needle. Utility Model Content

[0004] The utility model aims to provide a marking detection device to alleviate the technical problem in the prior art that, in the production and processing of needle products, after multi-needle injection needles are coded, it is impossible to immediately perform online detection on the multi-needle injection needles to check whether the coding is successful, and it is impossible to achieve instant and convenient detection of the multi-needle injection needles.

[0005] The utility model provides a marking detection device, including a conveying track, a carrier is provided on the conveying track, a fixing groove is provided on the carrier, the fixing groove is used to hold materials, and also includes: a detection mechanism; the detection mechanism is arranged on one side of the conveying track, the detection mechanism includes a detection part and a lighting part; the detection end of the detection part faces the material; the lighting part is arranged on one side of the detection part, and the lighting direction of the lighting part faces the detection point of the material.

[0006] The needle body is placed in the material, the material is placed in the fixed groove and moves on the conveying track with the carrier. When it moves to a position relative to the detection part, the coding part of the material is located at the monitoring point of the detection part, so that the detection part can detect the coding part of the material.

[0007] Furthermore, there are a plurality of fixing grooves; the plurality of fixing grooves are arranged at intervals along the same direction on the carrier.

[0008] Multiple fixed slots can hold multiple materials at the same time, thereby increasing the number of materials that can be tested simultaneously.

[0009] Furthermore, the marking detection device also includes a clamping mechanism; the clamping mechanism includes a clamping member and an adjusting assembly; the clamping member is arranged above the conveying track and its position is opposite to the position of the fixed groove, the clamping member is used to clamp the material, and the adjusting assembly is connected to the clamping member to drive the clamping member to rotate.

[0010] The clamping part performs a clamping action to connect with the material, and the adjusting component drives the clamping part to move upward and then rotate, so that the material in the carrier rotates with the clamping part, so that the detection part can capture the material from multiple angles and realize all-round detection of the material.

[0011] Furthermore, there are a plurality of the clamping members, and the plurality of the clamping members are arranged in a one-to-one correspondence according to the distribution of the plurality of the fixing grooves.

[0012] Furthermore, the detection mechanism also includes a horizontal driving component; the horizontal driving component is transmission-connected to the detection member, and the driving direction of the horizontal driving component is the same as the distribution direction of the plurality of fixing slots.

[0013] The horizontal driving component is drivingly connected to the detection member, and the driving direction of the horizontal driving component is the same as the distribution direction of the multiple fixed grooves, so that the detection member can detect the materials in the multiple fixed grooves in sequence.

[0014] Furthermore, the adjustment component includes a vertical driving member and a moving member; the vertical driving member has a moving end; the moving member is transmission-connected to the vertical driving member and the moving end of the vertical driving member; and the clamping member is connected to the moving member.

[0015] Furthermore, a guide rail extending in the vertical direction is provided on the mounting frame, the movable end of the movable member and the vertical driving member are connected, and the movable member slides in cooperation with the guide rail; the shock-absorbing assembly includes a guide rod and a shock-absorbing member; one end of the guide rod is fixedly connected to the mounting frame, and the movable member is provided with a through hole extending in the vertical direction, and the guide rod slides in cooperation with the through hole; the shock-absorbing member is arranged between the end of the guide rod away from the mounting frame and the movable member.

[0016] The clamping member is arranged on the moving member, and the moving member moves in the vertical direction under the drive of the vertical driving member, and the clamping member moves together with the moving member. After the movement stops, the shock absorbing member between the clamping member and the mounting frame can slow down the clamping member to prevent the clamping member from moving too fast during the downward movement of the moving member. When the movement stops suddenly, the material remains and falls off the clamping member due to inertia.

[0017] Furthermore, the adjustment assembly also includes an adjustment drive member and a transmission member; the adjustment drive member is arranged on the mounting frame; and the adjustment drive member is connected to the clamping member through the transmission member.

[0018] Furthermore, the detection mechanism also includes an adjustment component; the adjustment component is transmission-connected to the detection member, and the adjustment component includes a height adjustment member and a distance adjustment member; both the height adjustment member and the distance adjustment member are transmission-connected to the detection member; the distance adjustment member drives the detection member to move closer to or away from the transport track.

[0019] Furthermore, the lighting element is a ring-shaped structure; the detection element is arranged in the ring of the ring-shaped structure, and the detection element is located at a backlight position.

[0020] Beneficial effects:

[0021] The marking detection device provided by the utility model includes a conveying track, a carrier is provided on the conveying track, a fixing groove is provided on the carrier, the fixing groove is used to hold materials, and also includes: a detection mechanism; the detection mechanism is arranged on one side of the conveying track, the detection mechanism includes a detection part and a lighting part; the detection end of the detection part faces the material; the lighting part is arranged on one side of the detection part, and the lighting direction of the lighting part faces the detection point of the material.

[0022] Specifically, in the utility model, the needle body is placed in the material, the material is placed in the fixed groove and moves on the conveying track with the carrier. When it moves to a position relative to the detection part, the coding part of the material is located at the monitoring point of the detection part, so that the detection part can realize the detection of the coding part of the material. After the detection, the detection result is transmitted to the control end for recording. The mark detection device provided by the utility model can be directly combined with the production line of needle body processing, and the feeding conveying track in the production line is connected with the conveying track in the utility model, so that the processed material is carried by the carrier directly into the mark detection device for detection, thereby realizing instant and convenient online detection of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of the structure of the marking detection device provided in the embodiment of the utility model Figure 1 ;

[0025] Figure 2 A schematic diagram of the structure of the marking detection device provided in the embodiment of the utility model Figure 2 ;

[0026] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0027] Figure 4 for Figure 2 Enlarged view of point B in the middle.

[0028] icon:

[0029] 100 - transport track;

[0030] 200 - carrier; 210 - fixing slot;

[0031] 300-clamping mechanism; 310-clamping member; 320-vertical driving member; 330-moving member; 340-mounting frame; 350-shock absorbing assembly; 351-guide rail; 352-guide rod; 353-shock absorbing member;

[0032] 400 - detection mechanism; 410 - detection component; 420 - horizontal drive assembly; 430 - adjustment assembly; 440 - adjustment wheel; 450 - lighting component;

[0033] 500 - Materials. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0038] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0039] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0041] See also Figures 1 to 4 The marking detection device provided in this embodiment includes a conveying track 100, a carrier 200 is provided on the conveying track 100, a fixing groove 210 is provided on the carrier 200, and the fixing groove 210 is used to hold the material 500, and also includes: a detection mechanism 400. The detection mechanism 400 is arranged on one side of the conveying track 100, and the detection mechanism 400 includes a detection member 410 and an illumination member 450. The detection end of the detection member 410 faces the material 500. The illumination member 450 is arranged on one side of the detection member 410, and the illumination direction of the illumination member 450 faces the detection point of the material 500.

[0042] Specifically, the material 500 in this embodiment is a multi-needle injection needle. The needle body is placed in the material 500, and the material 500 is clamped in the fixing groove 210 and moves on the conveying track 100 along with the carrier 200.

[0043] When the detection element 410 is moved to a position opposite to the detection element 410 , the detection element 410 can detect the coding portion of the material 500 . After the detection, the detection result is transmitted to the control end for recording.

[0044] The marking detection device provided in this embodiment can be directly combined with the production line of needle assembly, and the feeding conveying track 100 in the production line is connected with the conveying track 100 in this embodiment, so that the processed material 500 is carried by the carrier 200 and directly enters the marking detection device for inspection, thereby realizing instant and convenient on-line inspection of the material 500.

[0045] In this embodiment, there are a plurality of fixing grooves 210 , and the plurality of fixing grooves 210 are arranged on the carrier 200 at intervals along the same direction.

[0046] The plurality of fixing slots 210 can hold a plurality of materials 500 at the same time, thereby increasing the number of materials 500 that can be inspected at the same time and improving inspection efficiency.

[0047] During the inspection, the materials 500 in the multiple fixed slots 210 can be inspected sequentially, or the materials 500 in the multiple fixed slots 210 can be inspected at one time by wide-angle shooting. In this embodiment, the inspection member 410 moves along the setting direction of the multiple fixed slots 210, and the materials 500 in each fixed slot 210 are photographed and inspected separately, and the accuracy of the inspection result is relatively high.

[0048] In this embodiment, the marking detection device further includes a clamping mechanism 300. The clamping mechanism 300 includes a clamping member 310 and an adjusting assembly. The clamping member 310 is disposed above the conveying track 100 and is located opposite to the position of the fixing slot 210. The clamping member 310 is used to clamp the material 500. The adjusting assembly is connected to the clamping member 310 to drive the clamping member 310 to rotate.

[0049] Specifically, the clamping member 310 in this embodiment is a pneumatic clamp, which is driven by a cylinder to clamp and release. When the carrier 200 moves to the detection position, the carrier 200 stops moving, and the clamping member 310 performs a clamping action to connect with the material 500. The adjustment component drives the clamping member 310 to move upward and then rotates, so that the material 500 in the carrier 200 rotates with the clamping member 310, so that the detection member 410 can shoot multiple angles of the material 500, and realize all-round detection of the material 500.

[0050] In this embodiment, there are a plurality of clamping members 310 , and the plurality of clamping members 310 are arranged one by one in a distribution manner of the plurality of fixing slots 210 .

[0051] Multiple clamping members 310 can clamp and rotate the materials 500 in multiple fixed grooves 210 at the same time to realize simultaneous detection of multiple materials 500. After the detection is completed, a single clamping member 310 can be driven to rotate the top cover of the material 500 in each fixed groove 210, so that the top cover of the material 500 rotates, thereby shrinking the part of the needle body exposed outside the material 500 into the material under the action of rotation.

[0052] In this embodiment, the detection mechanism 400 further includes a horizontal driving assembly 420 . The horizontal driving assembly 420 is drivingly connected to the detection member 410 , and the driving direction of the horizontal driving assembly 420 is the same as the distribution direction of the plurality of fixing slots 210 .

[0053] The horizontal driving assembly 420 in this embodiment includes a bracket, a horizontal guide rail and a horizontal cylinder. The detection member 410 is arranged on the horizontal guide rail through its own mounting seat. The extension direction of the horizontal guide rail is the same as the distribution direction of the plurality of fixed slots 210. The detection member 410 is driven by the horizontal cylinder to move along the extension direction of the horizontal guide rail, so that the detection member 410 can detect the materials 500 in the plurality of fixed slots 210 in sequence.

[0054] In addition, the horizontal guide rail and the horizontal cylinder are both arranged on the bracket to increase the height of the horizontal guide rail and the horizontal cylinder so that the height of the detection member 410 can be flush with the height of the fixing groove 210, and the detection point of the detection member 410 can be just opposite to the material 500.

[0055] In this embodiment, the adjustment assembly includes a vertical driving member 320 and a moving member 330. The vertical driving member 320 has a moving end. The moving member 330 is transmission-connected to the moving end of the vertical driving member 320. The clamping member 310 is connected to the moving member 330.

[0056] The vertical driving member 320 can drive the moving member 330 to move in the vertical direction. The vertical driving member 320 in this embodiment is a vertically arranged driving cylinder. When the moving member 330 moves in the vertical direction, the clamping member 310 moves with the moving member 330.

[0057] Specifically, in this embodiment, the detection height of the detection member 410 is relatively high. When the carrier 200 moves to the detection position, the vertical driving member 320 drives the clamping member 310 to move downward through the moving member 330 until the clamping member 310 is in contact with the material 500 in the fixed groove 210. After the clamping member 310 clamps the material 500, it moves upward with the material 500 under the drive of the vertical driving member 320 until the position of the material 500 is opposite to the detection member 410, and the detection member 410 can detect the material 500. After the detection member 410 detects all the materials 500 in turn, the clamping member 310 moves downward again under the drive of the vertical driving member 320 and puts the material 500 back into the fixed groove 210. According to the detection result, after the clamping member 310 puts the material 500 into the fixed groove 210, the cover of the clamping material 500 is rotated, so that the part of the needle body exposed outside the material 500 shrinks into the material under the action of rotation.

[0058] In this embodiment, the adjustment assembly also includes a mounting frame 340 and a shock absorbing assembly 350; the mounting frame 340 is provided with a guide rail 351 extending in the vertical direction, the moving member 330 is connected to the moving end of the vertical driving member 320, and the moving member 330 is slidably matched with the guide rail 351. The shock absorbing assembly 350 includes a guide rod 352 and a shock absorbing member 353. One end of the guide rod 352 is fixedly connected to the mounting frame 340, and the moving member 330 is provided with a through hole extending in the vertical direction, and the guide rod 352 is slidably matched with the through hole. The shock absorbing member 353 is arranged between the end of the guide rod 352 away from the mounting frame 340 and the moving member 330.

[0059] When the vertical driving member 320 drives the moving member 330 to move downward, the clamping member 310 moves downward with the moving member 330, and stops moving after the moving member 330 reaches the moving end. The moving member 330 continues to slide down on the guide rail 351 under the action of inertia while maintaining the downward movement. The damping member 353 is compressed during the sliding process of the moving member 330, so that the damping member 353 absorbs the potential energy of the moving member 330 and generates an upward force during the compression process, and the clamping member 310 is decelerated by force until it stops sliding downward. In this process, the damping member 353 is compressed and generates an opposite force applied to the moving member 330, so that the moving member 330 slows down slowly, and there will be no sudden stop, thereby achieving the deceleration of the clamping member 310, avoiding the clamping member 310 from moving too fast during the downward movement of the moving member 330, and when the movement stops suddenly, the material 500 keeps falling off from the clamping member 310 due to inertia, and it can also avoid multiple emergency stops that cause component damage and failure.

[0060] In this embodiment, the adjustment assembly further includes an adjustment drive member and a transmission member. The adjustment drive member is disposed on the mounting frame 340. The adjustment drive member is connected to the clamping member 310 through the transmission member.

[0061] Among them, the adjustment driving member in this embodiment is a rotating motor, and the transmission member is a transmission belt.

[0062] Specifically, the rotating motor in this embodiment is arranged on the mounting frame 340, and the output shaft of the rotating motor is connected to the clamping member 310 through a transmission belt, thereby driving the clamping member 310 to rotate, realizing the rotation of the material 500, and further realizing the detection method of the material 500 while rotating and photographing.

[0063] As an implementable method, the rotating motor can be replaced by a starting drive member, such as a rotary cylinder or a linear drive cylinder. When a linear drive cylinder is used as a starting drive member, gears and racks can be used as transmission components to achieve a transmission connection with the clamping member 310, so that the clamping member 310 can rotate.

[0064] In this embodiment, the detection mechanism 400 further includes an adjustment component 430. The adjustment component 430 is in transmission connection with the detection member 410, and the adjustment component 430 includes a height adjustment member and a distance adjustment member. Both the height adjustment member and the distance adjustment member are in transmission connection with the detection member 410. The distance adjustment member drives the detection member 410 to approach or move away from the conveying track 100.

[0065] The distance adjustment member in this embodiment is a horizontally arranged adjustment plate, on which a slide rail is arranged, and the detection member 410 is arranged in the slide rail and slides with the slide rail, so as to move closer to or away from the material 500 in the horizontal direction. The height adjustment assembly 430 includes a ball screw and an adjustment wheel 440, the lead screw of the ball screw is vertically arranged on the horizontal guide rail and connected to the driving end of the horizontal cylinder, the moving member 330 of the ball screw is connected to the adjustment plate, so that the adjustment plate can move in the vertical direction under the rotation of the lead screw, so as to realize the height adjustment of the detection member 410, and the adjustment wheel 440 is connected to the lead screw, so as to manually adjust the height of the detection member 410.

[0066] The adjustment component 430 can adjust the height of the detection member 410 and the linear distance between the detection member 410 and the material 500 so that the detection point of the detection member 410 can coincide with the position of the material 500, thereby improving the accuracy of detection.

[0067] It should be noted that the detection part 410 in this embodiment is a CCD camera. The distance between the lens of the CCD camera and the material 500 can be adjusted by adjusting the component 430 so that the distance between the CCD camera and the material 500 is as close as possible to the focal length of the CCD camera, so that the shooting picture of the CCD camera is clearer.

[0068] In this embodiment, the lighting element 450 is a ring-shaped structure. The detection element 410 is disposed inside the ring of the ring-shaped structure, and the detection element 410 is located at a backlight position.

[0069] Specifically, the lens of the CCD camera in this embodiment is located in the ring of the annular lighting element 450, and the lens of the CCD camera is located in the backlight, so the shooting picture will not be unclear due to excessive light.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A marking detection device, comprising a conveying track (100), wherein a carrier (200) is provided on the conveying track (100), wherein a fixing groove (210) is provided on the carrier (200), wherein the fixing groove (210) is used to hold a material (500), wherein: Also includes: Testing agency (400); The detection mechanism (400) is disposed on one side of the transport track (100), and the detection mechanism (400) comprises a detection component (410) and a lighting component (450); The detection end of the detection member (410) faces the material (500); The lighting component (450) is disposed on one side of the detection component (410), and the lighting direction of the lighting component (450) is toward the detection point of the material (500).

2. The marking detection device according to claim 1, characterized in that: There are a plurality of fixing grooves (210); A plurality of the fixing grooves (210) are arranged on the carrier (200) at intervals along the same direction.

3. The marking detection device according to claim 2, characterized in that: The marking detection device also includes a clamping mechanism (300); The clamping mechanism (300) comprises a clamping member (310) and an adjustment assembly; The clamping member (310) is arranged above the conveying track (100) and is located opposite to the position of the fixing groove (210). The clamping member (310) is used to clamp the material (500). The adjustment component is connected to the clamping member (310) to drive the clamping member (310) to rotate and move in a vertical direction.

4. The marking detection device according to claim 3, characterized in that: There are a plurality of the clamping members (310); the plurality of the clamping members (310) are arranged in a one-to-one correspondence according to the distribution of the plurality of the fixing grooves (210).

5. The marking detection device according to claim 4, characterized in that: The detection mechanism (400) further includes a horizontal driving component (420); The horizontal driving component (420) is drivingly connected to the detection member (410), and the driving direction of the horizontal driving component (420) is the same as the distribution direction of the plurality of fixing slots (210).

6. The marking detection device according to claim 5, characterized in that: The adjustment assembly includes a vertical driving member (320) and a moving member (330); The vertical driving member (320) has a moving end; The moving member (330) is in transmission connection with the moving end of the vertical driving member (320); The clamping member (310) is connected to the moving member (330).

7. The marking detection device according to claim 6, characterized in that: The adjustment assembly also includes a mounting frame (340) and a shock absorbing assembly (350); The mounting frame (340) is provided with a guide rail (351) extending in the vertical direction, the moving member (330) and the moving end of the vertical driving member (320) are connected, and the moving member (330) and the guide rail (351) are slidably matched; The shock absorbing assembly (350) comprises a guide rod (352) and a shock absorbing member (353); One end of the guide rod (352) is fixedly connected to the mounting frame (340); the moving member (330) is provided with a through hole extending in a vertical direction; the guide rod (352) is slidably matched with the through hole; The shock absorbing member (353) is arranged between an end of the guide rod (352) away from the mounting frame (340) and the moving member (330).

8. The marking detection device according to claim 7, characterized in that: The adjustment assembly also includes an adjustment drive member and a transmission member; The adjusting driving member is arranged on the mounting frame (340); The adjusting driving member is connected to the clamping member (310) via the transmission member.

9. The marking detection device according to claim 1, characterized in that: The detection mechanism (400) further includes an adjustment component (430); The adjustment component (430) is transmission-connected to the detection component (410), and the adjustment component (430) comprises a height adjustment component and a distance adjustment component; The height adjustment member and the distance adjustment member are both in transmission connection with the detection member (410); The distance adjusting member drives the detecting member (410) to move closer to or farther away from the transport track.

10. The marking detection device according to claim 1, characterized in that: The lighting element (450) is a ring-shaped structure; The detection element (410) is arranged inside the ring of the annular structure, and the detection element (410) is located in a backlight position.

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