Method and mechanism for realizing high-precision bonding between screen and cover glass

Abstract

The present invention provides a method for realizing high-precision bonding of a screen and a cover glass. The present invention utilizes the characteristics of the cover glass itself and uses a collimated light source and a light source receiver to determine whether the cover glass is tilted. When tilted, the angle of the cover glass is adjusted to make it parallel to the screen, so that the screen and the cover glass can be bonded more accurately and meet the production requirements of high-precision electronic equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of screen and cover glass bonding, and in particular to a method and mechanism for achieving high-precision bonding between a screen and a cover glass. Background Art

[0002] Before assembling an electronic device, the screen and the cover glass need to be pasted together, and then the screen and the cover glass need to be installed on the electronic device. The function of the cover glass is to protect the screen. As the thickness of electronic devices becomes thinner and the precision requirements become higher, the screen and the cover glass need to be aligned before they can be pasted. In the prior art, in order to meet the precision requirements, camera positioning is generally used, mainly to let the screen and the cover glass be in the field of view of the camera, and then take a picture, and position it by capturing the features in the image. However, taking a picture cannot determine whether the cover glass remains parallel to the screen. If the mechanism is used for a long time or the cover glass is loose when transporting, the cover glass will tilt at a certain angle. Then, after taking a picture, when positioning the features in the image, there will be deviations from the feature positioning when it is parallel (that is, in the ideal state), which will cause the cover glass to not be accurately aligned with the screen when it is pasted. Summary of the invention

[0003] Therefore, it is necessary for the present invention to provide a method and mechanism for achieving high-precision bonding between a screen and a cover glass, which can make the bonding between the screen and the cover glass more accurate and meet the production requirements of high-precision electronic equipment.

[0004] The first specific embodiment of the present invention provides a method for realizing high-precision bonding between a screen and a cover glass, using a fixed single camera group for visual positioning, the single camera group includes one or more cameras, and the method includes:

[0005] Controlling a single camera group to take a picture of a screen to obtain a first image, wherein the screen is fixed by a fixing mechanism;

[0006] Identify a first predetermined target of the screen in the first image and obtain the coordinates of the first predetermined target;

[0007] Turning on a collimated light source and a light source receiver, wherein the collimated light source is used to emit collimated light perpendicular to the screen, and the light source receiver is used to receive light emitted by the collimated light source;

[0008] Controlling the moving mechanism to move the cover glass between the single-group camera and the fixing mechanism so that the collimated light passes through the cover glass;

[0009] determining the tilt direction of the cover glass relative to the screen according to the offset direction of the light received by the light source receiver;

[0010] Adjusting the angle of the cover glass in real time so that the light received by the light source receiver is no longer offset;

[0011] Controlling the single camera group to take a picture of the cover glass to obtain a second image;

[0012] Identify a second predetermined target of the cover glass in the second image that corresponds to the first predetermined target and obtain coordinates of the second predetermined target;

[0013] Obtaining a position deviation of the cover glass according to the coordinates of the first predetermined target and the coordinates of the second predetermined target;

[0014] The moving mechanism is controlled to move according to the position deviation so as to align and affix the cover glass to the screen.

[0015] A second specific embodiment of the present invention provides a method for achieving high-precision bonding between a screen and a cover glass, using a fixed single camera group for visual positioning, the single camera group includes one or more cameras, and the method includes:

[0016] Controlling a single camera group to take a picture of a screen to obtain a first image, wherein the screen is fixed by a fixing mechanism;

[0017] Identify a first predetermined target of the screen in the first image and obtain the coordinates of the first predetermined target;

[0018] Turning on a collimated light source and a light source receiver, wherein the collimated light source is used to emit collimated light perpendicular to the screen, and the light source receiver is used to receive light emitted by the collimated light source;

[0019] Controlling the moving mechanism to move the cover glass between the single-group camera and the fixing mechanism so that the collimated light passes through the cover glass;

[0020] Calculating the tilt direction and tilt angle of the cover glass relative to the screen according to the offset of the light determined after the light source receiver receives the light, the thickness of the cover glass, and the refractive index of the cover glass;

[0021] Adjusting the angle of the cover glass so that the cover glass is substantially parallel to the screen;

[0022] Controlling the single camera group to take a picture of the cover glass to obtain a second image;

[0023] Identify a second predetermined target of the cover glass in the second image that corresponds to the first predetermined target and obtain coordinates of the second predetermined target;

[0024] Obtaining a position deviation of the cover glass according to the coordinates of the first predetermined target and the coordinates of the second predetermined target;

[0025] The moving mechanism is controlled to move according to the position deviation so as to align and affix the cover glass to the screen.

[0026] In the above two specific implementations, more specifically, before controlling the single camera group to take a picture of the cover glass to obtain the second image, the method further includes:

[0027] The light diffuser is moved between the cover glass and the collimated light source, and the collimated light emitted by the collimated light source is dispersed by the light diffuser and passes through the cover glass to enter the single group camera.

[0028] In the above two specific implementations, more specifically, when the light diffuser is located between the cover glass and the collimated light source, the light diffuser covers the screen.

[0029] The present invention also provides a mechanism for achieving high-precision bonding between a screen and a cover glass, wherein the bonding mechanism adopts the bonding methods described in the above two specific implementations.

[0030] The method provided by the present invention utilizes the characteristics of the cover glass itself, and uses a collimated light source and a light source receiver to determine whether the cover glass is tilted. When tilted, the angle of the cover glass is adjusted to make it parallel to the screen, so that the screen and the cover glass can be more accurately attached to each other, meeting the production requirements of high-precision electronic equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a diagram showing the pasting effect when the cover glass is tilted relative to the screen.

[0032] Figure 2 This is a method flow chart of the first specific implementation mode of the present invention.

[0033] Figure 3 It is a structural schematic diagram of a specific implementation mode of the sticking mechanism of the present invention.

[0034] Figure 4 Schematic diagram of the deviation of collimated light after passing through the cover glass.

[0035] Figure 5 It is a structural schematic diagram of another specific implementation mode of the sticking mechanism of the present invention.

[0036] Figure 6 This is a method flow chart of the second specific embodiment of the present invention. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0038] The first specific embodiment of the present invention provides a method for achieving high-precision alignment of the screen 100 and the cover glass 200, which aims to overcome the problem of inaccurate alignment caused by positioning deviation in the prior art due to the loosening of the cover glass 200 during long-term use of the mechanism or during transportation, which causes the cover glass 200 to tilt at a certain angle.

[0039] Specifically, the camera positioning is to take pictures of the screen 100 and the cover glass 200 by the camera and identify the target coordinates, and then move the cover glass 200 to align with the screen 100 according to the target coordinate deviation. Figure 1 As shown, the lens holes on the screen 100 and the cover glass 200 are used as targets.

[0040] After the camera captures the screen 100, it identifies the lens hole on the screen 100 and then records the coordinates of the lens hole 101 on the screen 100 as (x1, y1). The camera then captures the lens hole 201 on the cover glass 200 and then records the coordinates of the lens hole 201 on the cover glass 200 as (x2, y2), and the offset of the cover glass 200 is determined based on (x1, y1) and (x2, y2).

[0041] However, when the cover glass 200 is tilted, the image obtained by the camera is parallel to the screen 100 by default, and the coordinates (x2, y2) of the lens hole on the cover glass 200 are recorded based on the upper surface, which is actually different from the coordinates (x2', y2') of the lens hole on the lower surface. The cover glass 200 is then moved according to (x2, y2) and (x1, y1) to align the cover glass 200 with the screen 100, and then the cover glass 200 is moved down to attach it to the screen 100. The lower surface of the cover glass 200 first contacts the screen 100, and the lens hole on the lower surface is not actually aligned with the lens hole on the screen 100. Therefore, deviation will occur after attachment.

[0042] In this regard, the first specific embodiment of the present invention provides a method for achieving high-precision bonding of the screen 100 and the cover glass 200. The method can be applied to a bonding mechanism, such as Figure 2 As shown, the sticking mechanism includes a fixing mechanism 11, a moving mechanism 12, a collimated light source 13, a light source receiver 14 and a single camera group 15. Except that the moving mechanism 12 can move during operation, the fixing mechanism 11, the collimated light source 13, the light source receiver 14 and the single camera group 15 are all fixed during operation.

[0043] The screen 100 is fixed by the fixing mechanism 11. The moving mechanism 12 fixes the cover glass 200 on the moving mechanism 12 by sucking the cover glass 200, and can change the position and angle of the cover glass 200.

[0044] The collimated light source 13 is mounted on the fixing mechanism 11 and is used to emit collimated light perpendicular to the screen 100 . The light source receiver 14 is used to receive the light emitted by the collimated light source 13 .

[0045] like Figure 3 As shown, the method of the first specific embodiment of the present invention includes:

[0046] S101: Control the single camera group 15 to take a picture of the screen 100 to obtain a first image.

[0047] S102: Identify a first predetermined target of the screen 100 in the first image and obtain the coordinates of the first predetermined target.

[0048] The first predetermined target is a pre-selected structure on the screen 100 , which may be a rounded edge line of the screen 100 , or a straight edge line of the screen 100 , or an edge line of a circular hole on the screen 100 .

[0049] S103: Turn on the collimated light source 13 and the light source receiver 14.

[0050] S104 : controlling the moving mechanism 12 to move the cover glass 200 between the single-group camera 15 and the fixing mechanism 11 so that the collimated light passes through the cover glass 200 .

[0051] S105 : determining the tilt direction of the cover glass 200 relative to the screen 100 according to the offset direction of the light received by the light source receiver 14 .

[0052] Since the cover glass 200 is light-transmissive and its refractive index is different from that of air, Figure 4 As shown, if the cover glass 200 is tilted, the collimated light will be deviated to one side. The direction of the deviated collimated light can be detected by the light source receiver 14, and the tilt direction of the cover glass 200 relative to the screen 100 can be determined.

[0053] S106: Adjust the angle of the cover glass 200 in real time so that the light received by the light source receiver 14 is no longer offset.

[0054] The angle of the cover glass 200 is adjusted in real time by the moving mechanism 12. When the cover glass 200 is parallel to the screen 100 (that is, the cover glass 200 is perpendicular to the collimated light), the light received by the light source receiver 14 is no longer offset, that is, the cover glass 200 is parallel to the screen 100.

[0055] S107: Control the single-group camera 15 to take a picture of the cover glass 200 to obtain a second image.

[0056] The present invention uses the fixed and identical single camera group 15 to take pictures of the screen 100 and the cover glass 200, which can avoid the problem of inaccurate alignment caused by the need to adjust multiple cameras and mapping between cameras.

[0057] Before taking pictures, the moving mechanism 12 can be controlled to move the portion corresponding to the second predetermined target of the cover glass 200 into the shooting range of the single-group camera 15 and to space the cover glass 200 and the screen 100 at a predetermined distance. In this way, the calculation error caused by the different distances between the cover glass 200 and the screen 100 and the single-group camera 15 can be minimized.

[0058] It is particularly important to explain that, since the present invention uses a single-group camera 15 to successively position the screen 100 and the cover glass 200, when the cover glass 200 is positioned, it is necessary to move the cover glass 200 into the shooting range of the single-group camera 15, that is, the cover glass 200 is between the screen 100 and the single-group camera 15. Since the cover glass 200 has a transparent part, if the cover glass 200 is not irradiated with an exposure light source, the second image obtained by shooting includes not only the cover glass 200, but also the screen 100. Since the outline of the cover glass 200 is substantially the same as that of the screen 100, it will result in the inability to distinguish between the second predetermined target and the first predetermined target in subsequent steps.

[0059] Therefore, if Figure 5 As shown, a light homogenizer 16 may be provided. In this specific embodiment, before S07 , the light homogenizer 16 may be moved between the cover glass 200 and the collimated light source 13 , and the collimated light emitted by the collimated light source 13 may be dispersed by the light homogenizer 16 and pass through the cover glass 200 to enter the single group camera 15 .

[0060] The light diffuser 16 can be moved in parallel by a driving mechanism, so that the light diffuser 16 can be penetrated by the collimated light source 13 or leave the collimated light source 13 .

[0061] In this regard, the collimated light source 13 can not only be used to determine the tilt direction of the screen 100 glass, but also emit light and enter the single-group camera 15 after being homogenized by the homogenizer 16, so that the single-group camera 15 can obtain the overexposed second image when taking a picture of the cover glass 200. Only the cover glass 200 is displayed in the second image, and the screen 100 is no longer displayed, so as to distinguish the second predetermined target from the first predetermined target.

[0062] More preferably, when the light homogenizing plate 16 is located between the cover glass 200 and the collimated light source 13, the light homogenizing plate 16 covers the screen 100, so that the light homogenizing plate 16 can be used as a solid color background picture to better identify the second predetermined target, and the light homogenizing plate 16 blocks the screen 100 so that the screen 100 is not captured in the second image.

[0063] S108: Identify a second predetermined target of the cover glass 200 in the second image that corresponds to the first predetermined target and obtain the coordinates of the second predetermined target.

[0064] The cover glass 200 includes a middle transparent part and a black outer frame part surrounding the middle transparent part, and the second predetermined target includes an edge line of the black outer frame part of the cover glass 200 in the second image, and the edge line is an outer edge line or an inner edge line, and the edge line is a straight edge line or a rounded edge line.

[0065] Preferably, a light-transmitting hole for a front camera is provided on the cover glass 200 , and the second predetermined target may include an edge line of the light-transmitting hole of the cover glass 200 in the second image.

[0066] Even if the second image is overexposed, since the cover glass 200 includes a black outer frame portion, the black outer frame portion of the cover glass 200 in the second image still has reliable clarity, making it easy to obtain the coordinates of the second predetermined target.

[0067] S109: Obtaining a position deviation of the cover glass 200 according to the coordinates of the first predetermined target and the coordinates of the second predetermined target.

[0068] S110: Control the moving mechanism 12 to move according to the position deviation so as to align and attach the cover glass 200 to the screen 100 .

[0069] The method provided in the specific embodiment of the present invention utilizes the characteristics of the cover glass 200 itself, and uses the collimated light source 13 and the light source receiver 14 to determine whether the cover glass 200 is tilted. When tilted, the angle of the cover glass 200 is adjusted to make it parallel to the screen 100, so that the screen 100 and the cover glass 200 can be more accurately attached to meet the production requirements of high-precision electronic equipment.

[0070] like Figure 6 As shown, the second specific embodiment of the present invention provides a method for achieving high-precision bonding of the screen 100 and the cover glass 200. It should be understood that the specific technical solutions applicable to the first specific embodiment can also be applicable to this embodiment, and will not be repeated hereafter.

[0071] The method of the second specific embodiment of the present invention comprises:

[0072] S201: Control the single camera group 15 to take a picture of the screen 100 to obtain a first image.

[0073] S202: Identify a first predetermined target of the screen 100 in the first image and obtain the coordinates of the first predetermined target.

[0074] S203: Turn on the collimated light source 13 and the light source receiver 14.

[0075] S204 : controlling the moving mechanism 12 to move the cover glass 200 to between the single-group camera 15 and the fixing mechanism 11 so that the collimated light passes through the cover glass 200 .

[0076] S205 : Calculating the tilt direction and tilt angle of the cover glass 200 relative to the screen 100 according to the offset of the light determined after the light source receiver 14 receives the light, the thickness of the cover glass 200 , and the refractive index of the cover glass 200 .

[0077] See also Figure 4 As shown, cover glasses 200 with different thicknesses, different refractive indices, and different tilt angles will result in different light offsets, that is, the tilt direction and tilt angle of the cover glass 200 relative to the screen 100 can be calculated through the light offset, the thickness and refractive index of the cover glass 200, and the angle of the cover glass 200 can be adjusted directly in one step without slowly trying to change the tilt angle of the cover glass 200.

[0078] S206 : adjusting the angle of the cover glass 200 so that the cover glass 200 is substantially parallel to the screen 100 .

[0079] S207: Control the single-group camera 15 to take a picture of the cover glass 200 to obtain a second image.

[0080] S208: Identify a second predetermined target of the cover glass 200 in the second image that corresponds to the first predetermined target and obtain the coordinates of the second predetermined target.

[0081] S209: Obtaining a position deviation of the cover glass 200 according to the coordinates of the first predetermined target and the coordinates of the second predetermined target.

[0082] S210: Control the moving mechanism 12 to move according to the position deviation to align and attach the cover glass 200 to the screen 100 .

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for realizing high-precision bonding of a screen and a cover glass, using a fixed single camera group for visual positioning, wherein the single camera group includes one or more cameras, characterized in that: The method comprises: Controlling a single camera group to take a picture of a screen to obtain a first image, wherein the screen is fixed by a fixing mechanism; Identify a first predetermined target of the screen in the first image and obtain the coordinates of the first predetermined target; Turning on a collimated light source and a light source receiver, wherein the collimated light source is used to emit collimated light perpendicular to the screen, and the light source receiver is used to receive light emitted by the collimated light source; Controlling the moving mechanism to move the cover glass between the single group camera and the fixing mechanism so that the collimated light passes through the cover glass; determining the tilt direction of the cover glass relative to the screen according to the offset direction of the light received by the light source receiver; Adjusting the angle of the cover glass in real time so that the light received by the light source receiver is no longer offset; Controlling the single camera group to take a picture of the cover glass to obtain a second image; Identify a second predetermined target of the cover glass in the second image that corresponds to the first predetermined target and obtain the coordinates of the second predetermined target; Obtaining a position deviation of the cover glass according to the coordinates of the first predetermined target and the coordinates of the second predetermined target; The moving mechanism is controlled to move according to the position deviation so as to align and affix the cover glass to the screen.

2. A method for achieving high-precision bonding of a screen and a cover glass, using a fixed single camera group for visual positioning, the single camera group includes one or more cameras, characterized in that: The method comprises: Controlling a single camera group to take a picture of a screen to obtain a first image, wherein the screen is fixed by a fixing mechanism; Identify a first predetermined target of the screen in the first image and obtain the coordinates of the first predetermined target; Turning on a collimated light source and a light source receiver, wherein the collimated light source is used to emit collimated light perpendicular to the screen, and the light source receiver is used to receive light emitted by the collimated light source; Controlling the moving mechanism to move the cover glass between the single group camera and the fixing mechanism so that the collimated light passes through the cover glass; Calculating the tilt direction and tilt angle of the cover glass relative to the screen according to the offset of the light determined after the light source receiver receives the light, the thickness of the cover glass, and the refractive index of the cover glass; Adjusting the angle of the cover glass so that the cover glass is substantially parallel to the screen; Controlling the single camera group to take a picture of the cover glass to obtain a second image; Identify a second predetermined target of the cover glass in the second image that corresponds to the first predetermined target and obtain coordinates of the second predetermined target; Obtaining a position deviation of the cover glass according to the coordinates of the first predetermined target and the coordinates of the second predetermined target; The moving mechanism is controlled to move according to the position deviation so as to align and affix the cover glass to the screen.

3. The method for achieving high-precision bonding of a screen and a cover glass according to claim 1 or 2, characterized in that: Before controlling the single camera group to take a picture of the cover glass to obtain a second image, the method further includes: The light diffuser is moved between the cover glass and the collimated light source, and the collimated light emitted by the collimated light source is dispersed by the light diffuser and passes through the cover glass to enter the single group camera.

4. The method for achieving high-precision bonding of a screen and a cover glass according to claim 3, characterized in that: When the light diffuser is located between the cover glass and the collimated light source, the light diffuser covers the screen.

5. A mechanism for achieving high-precision bonding between a screen and a cover glass, characterized in that: The pasting mechanism adopts the pasting method as described in any one of claims 1-4.

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