Optical measurement system and optical measurement method for measuring measurement object

Abstract

To provide an optical measurement module for measuring a measurement object.SOLUTION: A measurement object includes a first corner, a second corner, a third corner, and a fourth corner, and an optical measurement module includes at least two optical lenses. At least the two optical lenses are disposed above at least two adjacent corners from among the first corner to the fourth corner, and one position from among at least the two optical lenses is defined as a reference position. At least the two optical lenses acquire images of at least the two adjacent corners, and an image analysis and comparison module is disposed so as to calculate the length of at least one side of the measurement object following the reference position by providing the image analysis and comparison module.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an optical measurement system and an optical measurement method for measuring a measurement object, and in particular to an optical measurement system and an optical measurement method for measuring a measurement object that simultaneously obtains images of the measurement object using first to fourth optical lenses. [Background technology]

[0002] The function of an IC carrier board is to carry ICs, primarily protecting the circuit, securing wiring, and dissipating excess heat. Because IC carrier boards are a critical component in the packaging process, their accuracy is crucial. Conventional carrier board measurement technology uses an optical lens equipped with a single charge-coupled device (CCD) to move the lens along the four edges of the measurement target / carrier board on a rotational axis. However, this technology suffers from the problem that precision errors in the optical lens can occur when capturing images due to precision errors in the device that moves the carrier board. These image errors can also lead to measurement errors. Therefore, to improve measurement accuracy, it is necessary to reduce the device movement.

[0003] Therefore, it is worth considering how to solve the problem of the inevitable precision error of the device for moving the carrier board when the carrier board moves. In consideration of the deficiencies of the prior art, the present invention was finally invented through careful experimentation, research, and perseverance. The present invention will be briefly described below. DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0004] The optical measurement system for measuring a measurement object of the present invention is calibrated with a reference plate and calculates the four sides of the measurement object using images obtained simultaneously by four optical lenses at the four corners, eliminating error values ​​that occur when the hardware moves. [Means for solving the problem]

[0005] The present invention provides an optical measurement system for measuring a measurement object, the system comprising: a first optical lens, a second optical lens, a third optical lens, and a fourth optical lens, wherein a first position of the first optical lens is a reference position, the first position being located above a first corner of the measurement object, the second optical lens, the third optical lens, and the fourth optical lens being located above a second corner, a third corner, and a fourth corner of the measurement object, respectively, and the first to fourth optical lenses are arranged to acquire a first image, a second image, a third image, and a fourth image above the first corner to the fourth corner, respectively; and an image analysis and comparison module coupled to the first to fourth optical lenses and arranged to calculate a first side length, a second side length, a third side length, and a fourth side length of the measurement object based on points A, B, C, and D of the measurement object in the first to fourth images.

[0006] From a main technical point of view, the present invention provides an optical measurement module for measuring a measurement object, the measurement object including a first corner, a second corner, a third corner and a fourth corner, the optical measurement module including at least two optical lenses arranged above at least two adjacent corners from the first corner to the fourth corner, the position of one of the at least two optical lenses being defined as a reference position, the at least two optical lenses being arranged to respectively acquire images of the at least two adjacent corners and provide them to an image analysis and comparison module, so that the image analysis and comparison module calculates the length of at least one side of the measurement object according to the reference position.

[0007] From another practical viewpoint, the present invention may provide a method for measuring a first measurement object using an optical module, the optical module including a first optical lens and a second optical lens, the method including: a step of moving the first optical lens and the second optical lens above the first measurement object; a step of causing the first optical lens and the second optical lens to simultaneously acquire a first image and a second image of the first measurement object, respectively; a step of determining points A and B of the first measurement object based on the first image and the second image; a step of setting point A as a reference position and calculating a first length of a line segment connecting point A and point B according to the reference position; and a step of comparing the first length with a specification of the first measurement object to determine whether the first measurement object is defective.

[0008] The present invention may be a method for measuring an object to be measured using an optical module, the optical module including a first optical lens and a second optical lens, the method including the steps of: causing the first optical lens and the second optical lens to simultaneously acquire a first image and a second image of the object to be measured, respectively; calculating a first parameter value of the object to be measured based on the first image and the second image; and comparing the first parameter value with specifications of the object to be measured to determine whether the object to be measured is defective. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic diagram of an optical measurement system for measuring a measurement object according to a preferred embodiment of the present invention; [Figure 2] 1 is a schematic three-dimensional view of an optical measurement module according to the present invention; [Figure 3] FIG. 2 is a schematic three-dimensional view of a tray and a measurement object contained therein. [Figure 4] FIG. 4 is a top view of the measurement object in FIG. 3. [Figure 5] 4 is a schematic diagram showing a method for calculating the inclination distance of the third side of the measurement object in FIG. 3. FIG. [Figure 6]FIG. 1 is a top view of a reference plate used in an optical lens. [Figure 7] 1 is a cross-sectional view of an optical lens and a reflector. [Figure 8] FIG. 1 is a schematic three-dimensional diagram of an optical lens camera and lens. [Figure 9] 1 is a three-dimensional schematic diagram of four optical lenses calibrated to a fixed spacing distance from each other using a reference plate. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present invention can be used for polygonal objects such as carrier boards and PCBs, which require precise measurement to ensure product yield. The measured data can be further analyzed, and based on changes in the data, attention can be determined in previous processes, such as the degree of wear on the blade used to cut the product and the cutting accuracy settings. The optical measurement system for measuring objects proposed by the present invention performs measurements at calibrated, fixed intervals, eliminating error values ​​caused by hardware movement. Photographing the object at once improves photographing efficiency, and the lens spacing distance does not change when moving to the next object, improving the stability of measurement accuracy.

[0011] 1 to 4, which illustrate an optical measurement system 101 for measuring a measurement object. The optical measurement system 101 includes an optical measurement module 10 and an image analysis and comparison module 102. The optical measurement module 10 includes a first optical lens 11, a second optical lens 12, a third optical lens 13, and a fourth optical lens 14 (see FIG. 2). As shown in FIG. 2, a first position 21 of the first optical lens 11 is a reference position. As shown in FIG. 3, the first position 21 is located above a first corner 321 of a first measurement object 31 in a tray 30. The second to fourth optical lenses 12, 13, and 14 are located above a second corner 322, a third corner 323, and a fourth corner 324 of the first measurement object 31, respectively. The first to fourth optical lenses 11 to 14 are positioned to capture first, second, third, and fourth images above the first to fourth corners 321 to 324, respectively. The image analysis and comparison module 102 is coupled to the first to fourth optical lenses 11-14, and is arranged to calculate the length Y1 of the first side, the length X1 of the second side, the length Y2 of the third side, and the length X2 of the fourth side of the front surface of the measurement object 31 based on points A, B, C, and D of the measurement object 31 in the first to fourth images as shown in Figure 4. After the measurement of the four sides of the front surface of the measurement object 31 is completed, the four sides of the back surface of the measurement object 31 also need to be measured.

[0012] In the above embodiment, the length Y2 of the third side of the measurement object 31 is the extension line EL drawn from point C as shown in Figure 5, and the projection line PL drawn from point B is projected onto the length Y2 of the third side, and the extension line EL perpendicularly intersects with the projection line PL at point C'. The image analysis and comparison module 102 is further configured to calculate the slope distance K of the length Y2 of the third side (e.g., 0.829 (μm) to 14.202 (μm)).

[0013] In the above embodiment, the length X1 of the second side of the measurement object 31 forms an angle θ with the projection line PL. The image analysis and comparison module 102 is further configured to calculate the angle inclination of point B using the angle θ, and compare it with the specifications of the measurement object 31 to determine whether it is a defective product (NG).

[0014] In the above-described embodiment, the first to fourth optical lenses 11-14 of the optical measurement module 10 are calibrated at the first position 21, the second position 22, the third position 23, and the fourth position 24 by the reference plate 60, as shown in Fig. 6. That is, the present invention uses the reference plate 60 to install the four optical lenses 11-14 at once, and according to the size of the first measurement object 31, one lens can be set as the reference position, and the other three lenses can be positioned at the corners of the first measurement object 31 with different axes.

[0015] In the above-described embodiment, the first to fourth optical lenses 11-14 of the optical measurement module 10 are all CCDs (including the camera 71 and lens 72 shown in FIG. 7). The CCD uses a reflector 73 to change the direction of light from the measurement object 31. The measurement object 31 is a polygonal measurement object such as a carrier board or PCB. Although a square is used as an example in FIG. 4, in actual applications, the measurement object may be a specific polygonal measurement object. The carrier board is used to control and measure the necessary processes before the IC is mounted, and the IC is usually connected to the carrier board using a flip-chip method. Referring to FIG. 8, the camera 81 and lens 82 of the third optical lens 13 are shown.

[0016] From a main technical point of view, the present invention provides an optical measurement module 10 for measuring a first measurement object 31, the first measurement object 31 including first, second, third, and fourth corners 321-324, and the optical measurement module 10 including at least two optical lenses (e.g., first and second optical lenses 11, 12). The at least two optical lenses 11, 12 are arranged above at least two adjacent corners (e.g., the first corner 321 and the second corner 322) among the first to fourth corners 321-324, and at least one position of the two optical lenses 11, 12 is used as a reference position. The at least two optical lenses 11, 12 respectively capture images of the at least two adjacent corners and provide them to an image analysis and comparison module 102, so that the image analysis and comparison module 102 is configured to calculate the length of at least one side of the first measurement object 31 (e.g., the length Y1 of the first side) according to the reference position.

[0017] In the above-described embodiment, the first measurement object 31 in the optical measurement module 10 is located in the tray 30. The at least two optical lenses include a first optical lens, a second optical lens, a third optical lens, and a fourth optical lens 11 to 14, where the first optical lens 11 and the second optical lens 12 are arranged on opposite sides of the X axis, and the fourth optical lens 14 is arranged parallel to the Y axis.

[0018] From another practical viewpoint, the present invention may include a method for measuring a first measurement object 31 using an optical module (e.g., optical measurement module 10) including a first optical lens 11 and a second optical lens 12. The method includes the steps of: moving the first optical lens 11 and the second optical lens 12 above the first measurement object 31; causing the first optical lens 11 and the second optical lens 12 to simultaneously capture a first image and a second image of the first measurement object 31, respectively; determining points A and B of the first measurement object 31 based on the first image and the second image; setting point A as a reference position and calculating a first length of a line segment connecting point A and point B (e.g., length Y1 of a first side) according to the reference position; and comparing the first length with specifications of the first measurement object 31 to determine whether the first measurement object 31 is defective.

[0019] 9 , in the above-described embodiment, the method further includes a step of positioning the first to fourth optical lenses 11-14 using a reference plate 60, where points A-D are located at the first to fourth corners 321-324 of the first measurement object 31, respectively. The reference plate 60 is selected according to the size of the first measurement object 31, and the first and second optical lenses 11, 12 are positioned using the reference plate 60. The method further includes a step of measuring the first and second optical lenses 11, 12 by moving them above the second measurement object 32 according to the position of the measurement object in the tray without changing the spacing between the first and second optical lenses 11, 12. Therefore, the optical measurement module of the present invention can be moved directly from above the first measurement object 31 to above the second measurement object 32 without changing the spacing between the four lenses.

[0020] The present invention may be a method for measuring a first measurement object 31 using an optical module (e.g., optical measurement module 10), where the optical module includes a first optical lens 11 and a second optical lens 12. The method includes the steps of causing the first optical lens 11 and the second optical lens 12 to simultaneously acquire a first image and a second image of the first measurement object 31, respectively, calculating a first parameter value (e.g., a first side length Y1) of the first measurement object 31 based on the first image and the second image, and comparing the first parameter value with a required specification of the first measurement object 31 to determine whether the first measurement object 31 is defective.

[0021] In summary, the present invention discloses a novel optical measurement system for measuring a measurement object. By using the first to fourth optical lenses, the image analysis and comparison module can calculate the lengths of the first to fourth sides of the measurement object based on points A to D of the measurement object in the first to fourth images. Therefore, the present invention has industrial value and achieves its original development objective.

[0022] Although the present invention has been disclosed with the preferred embodiments as described above, they are not intended to limit the scope of the present invention. Any changes and modifications made by those skilled in the art without departing from the spirit and scope of the present invention should be included within the scope of the present invention. [Explanation of symbols]

[0023] 10: Optical measurement module 11: First optical lens 12: Second optical lens 13: Third optical lens 14: Fourth optical lens 21:First position 22:Second position 23: Third position 24:Fourth position 30: Tray 31: Measurement object 32: Second measurement object 60: Reference plate 73:Reflector 81: Camera 82: Lens 101: Optical measurement system 102: Image analysis and comparison module 321: First corner 322: Second corner 323: Third corner 324: Fourth corner EL: Extension line K: Inclination distance PL: Projection line X1: Length of the second side X2: Length of the fourth side Y1: length of the first side Y2: Length of the third side θ: Angle

Claims

1. 1. An optical measurement system for measuring a measurement object, comprising: a first optical lens, a second optical lens, a third optical lens, and a fourth optical lens, wherein a first position of the first optical lens is a reference position, the first position is located above a first corner of the measurement object, the second optical lens, the third optical lens, and the fourth optical lens are located above a second corner, a third corner, and a fourth corner of the measurement object, respectively, and the first to fourth optical lenses are arranged to acquire a first image, a second image, a third image, and a fourth image above the first corner to the fourth corner, respectively; an image analysis and comparison module coupled to the first to fourth optical lenses and configured to calculate a first side length, a second side length, a third side length and a fourth side length of the measurement object based on points A, B, C and D of the measurement object in the first to fourth images.

2. the length of the third side is an extension line drawn from point C, a projection line drawn from point B is projected onto the length of the third side, and the extension line intersects the projection line perpendicularly at point C'; 2. The optical measurement system of claim 1, wherein the image analysis and comparison module is further configured to calculate a slope distance of the third side length.

3. the length of the second side forms an angle with the projection line; 3. The optical measurement system of claim 2, wherein the image analysis and comparison module is further configured to calculate an angle gradient of the point B using the angle and compare it with a specification of the measurement object to determine whether it is a defective product.

4. 3. The optical measurement system of claim 2, wherein the first optical lens, the second optical lens, the third optical lens, and the fourth optical lens are calibrated to the first position, the second position, the third position, and the fourth position, respectively, via a reference plate.

5. The first optical lens to the fourth optical lens are all CCDs, and the CCDs use reflectors to change the direction of light; 3. The optical measurement system according to claim 2, wherein the measurement object is a polygonal measurement object, and the polygonal measurement object is a carrier board, a PCB, or a specific polygonal measurement object.

6. 1. An optical measurement module for measuring a measurement object, the measurement object including a first corner, a second corner, a third corner, and a fourth corner; the optical measurement module includes at least two optical lenses disposed above at least two adjacent corners from the first corner to the fourth corner, the position of one of the at least two optical lenses being defined as a reference position; The optical measurement module is characterized in that the at least two optical lenses are configured to respectively acquire images of the at least two adjacent corners and provide them to an image analysis and comparison module, so that the image analysis and comparison module calculates the length of at least one side of the measurement object according to the reference position.

7. The measurement object is placed on a tray, 7. The optical measurement module of claim 6, wherein the at least two optical lenses include a first optical lens, a second optical lens, a third optical lens, and a fourth optical lens, the first optical lens and the second optical lens being arranged on opposite sides of the X-axis, and the fourth optical lens being arranged parallel to the Y-axis.

8. A method for measuring a first measurement object using an optical module, the optical module including a first optical lens and a second optical lens, The method comprises: moving the first optical lens and the second optical lens above the first measurement object; causing the first optical lens and the second optical lens to simultaneously acquire a first image and a second image of the first measurement object, respectively; determining points A and B of the first measurement object based on the first image and the second image; a step of setting point A as a reference position and calculating a first length of a line segment connecting point A and point B according to the reference position; and comparing the first length with a specification for the first measurement object to determine whether the first measurement object is defective.

9. and positioning the first optical lens and the second optical lens using a reference plate; The point A and the point B are located at a first corner and a second corner of the first measurement object, respectively; the reference plate is selected according to the size of the first measurement object; the first optical lens and the second optical lens are positioned using the reference plate; 9. The method of claim 8, further comprising the step of measuring by moving directly from above the first measurement object to above the second measurement object without changing the spacing distance between the first optical lens and the second optical lens.

10. A method for measuring a measurement object using an optical module, the optical module including a first optical lens and a second optical lens, The method comprises: causing the first optical lens and the second optical lens to simultaneously acquire a first image and a second image of the measurement object, respectively; calculating a first parameter value of the measurement object based on the first image and the second image; and comparing the first parameter value with a required specification of the measurement object to determine whether the measurement object is defective.

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