TWI470208B - Vision illumination apparatus for semi-translucent device - Google Patents

Description

Visual lighting equipment for translucent devices

The present invention provides a visual illumination device for a translucent device, comprising: at least two light sources as illumination devices and at least one photographic device capable of illuminating the entire defect area of the translucent device, and regardless of the translucency What is the shape or depth of the defect area of the device to achieve an accurate and reliable test result.

In order to ensure that electronic components or devices are free of defects, and in order to properly place electronic components that are considered to be critical in the electronics industry, the need to detect such electronic components on the production line is formed, and the detection device can be adapted to the needs of the user. Divided into automatic or semi-automatic devices.

For electronic components with conventional black compounds, the inspection of the package surface is usually done on the shallow surface of the device to detect incomplete filling/shredding, impurities, contaminants, package cracks, package surface scratches, wafers. Defects such as resin and lead exposure. For electronic components using molding compounds made of a transparent material that is transparent to light, not all defective regions appear on the shallow surface of the device. The defects are as invisible bubbles on a shallow surface, and the packaging defects of not all translucent devices can be visualized by the illumination of a conventional visual illumination device suitable for shallow surface detection. In addition, the illumination effect is inconsistent with the same type of defects that appear in the translucent device, and varies with the shape and depth of the defect. In other words, conventional lighting equipment is used to detect semi-transparent The high-angle annular light source, low-angle annular light source, and coaxial light source used in the device are suitable for illuminating major defects such as slit defects, thereby causing defective translucent devices to be mistaken for good products. Based on the cost considerations of the electronics industry, manufacturers of such translucent devices set stringent requirements to increase the accuracy of inspections using such conventional lighting devices.

Thus, by fabricating a visual inspection illumination device that illuminates the entire defect area regardless of the shape or depth of the defect area of the translucent device, to ensure accurate and reliable detection, and to overcome under-rejection. The problem.

It is a primary object of the present invention to provide a visual illumination device for a translucent device that utilizes a combined light source to detect defects on the shallow surface of the translucent device.

Another object of the present invention is to provide a visual illumination device for a translucent device that illuminates the entire defect area of the translucent device, regardless of the shape or depth of the defect region of the translucent device.

It is still another object of the present invention to provide a visual illumination device for a translucent device that can detect most package defects, including incomplete filling/shredding, impurities, contaminants, package cracks, air bubbles, package surface scratches, wafer resin (chip resin), lead exposure, and missing pad inspection.

It is still another object of the present invention to provide a visual illumination device for a translucent device that ensures accurate and reliable detection to overcome low detection accuracy (under-rejection) problem.

It is a further object of the present invention to provide a versatile translucent device visual illumination device that is versatile and that can be reliably and simultaneously executed with the same device as a composite visual inspection standard.

Other objects of the present invention will be apparent from the following detailed description and embodiments of the invention.

One embodiment of the present invention provides a visual inspection illumination device for a translucent device, comprising at least one illumination device and at least one imaging device, characterized in that:

The lighting device is provided with at least two light sources, at least one of which is provided with at least one light splitting device.

In order to enable your review committee to have a better understanding and understanding of the purpose, features and effects of the present invention, please refer to the following [simplified description of the drawings] for details:

Please refer to FIG. 1 , which is a schematic perspective view of a preferred embodiment of a visual illumination device for a translucent device of the present invention, wherein at least one optical path is derived from a light source of the device and reflected light from the optical path. The preferred embodiment comprises at least one visual inspection illumination device 2 having a combined light source, at least one imaging device 4 and at least one light splitting device 6. The visual inspection illumination device 2 preferably has at least two light sources, and is preferably an on-axis coaxial light source 2A and a ring light source 2B. The ring light source 2B includes a complex A plurality of light-emitting diodes 22 (hereinafter referred to as LEDs) disposed in an annular mask 8 are preferably cylindrical and oriented toward a translucent device 10 to be inspected. The LED 22 forming the annular light source 2B of the present invention can be disposed in the annular mask 8 of other geometric shapes in addition to the cylindrical annular mask 8 to achieve the purpose of generating high detection reliability and diffusing annular light. In order to achieve an optimum illumination effect, the LED 22 has an angle of arrangement of 30 to 60 degrees with one of the bases 8A of the annular reticle 8, but other ranges are considered to be possible. The annular reticle 8 is provided with an annular reticle perforation 8C for the light of the coaxial light source 2A adjacent to the annular reticle 8 to illuminate a target area for detection and to cause the reflected light to reach a lens of the photographic device 4. 5. The photographing device 4 is preferably a camera. Preferably, the annular reticle perforation 8C has a cross-sectional area of 10 mm by 10 mm. Light from the annular light source 2B will pass through at least one of the light splitting means 6 to produce a diffusing ring type light B as shown in the first optical path, and the light splitting means 6 is preferably a diffuser. Preferably, the diffuser 6 has a shape similar to that of the annular reticle 8 such that the diffuser 6 is disposed on the edge 8B of the base 8A opposite the annular reticle 8. The diffuser 6 is also provided with a central aperture 61. When the diffuser 6 is connected to the annular mask 8, the annular mask aperture 8C of the annular mask 8 and the center of the diffuser 6 The perforations 61 are in line so that the light from the coaxial light source 2A and the reflected light C pass through and enter the translucent device 10 and the photographing device 4 to be detected, respectively. In the present embodiment, the shape of the diffuser 6 is circular, but it should be understood that other can be combined with the ring. The geometry of the edge 8B of the reticle 8 conforms to the shape, i.e., the ability to produce diffused annular light that is also used for inspection purposes.

The diffused annular light B formed by the diffuser 6 is a uniform illumination for detecting cracks in the package surface. Irradiation of the package surface scratches with the diffused annular light B causes the package surface scratches to be apparently exhibited. The diffused annular light B can also be used to detect a missed liner because it illuminates the liner at the bottom of the translucent device 10.

Since the plurality of LEDs 21 are disposed on the same axis, and the plurality of LEDs are disposed at an angle of 90 degrees to the axis of the photographing device 4, the incident light A from the coaxial light source 2A is coaxially lighted as the coaxial light source 2A ( On-axis coaxial light, and the light emitted by the LED 21 passes through a beam splitter 12, and is reflected in the direction of the axis of the photographing device 4. The LEDs 21, 22 are surface mount type devices. In order to ensure that the LED 21 provided in the coaxial light source 2A emits light uniformly, the viewing angle is preferably 40 degrees or more. When the illumination detection is performed with the incident light A of the coaxial light source 2A, the package surface defects of the LED 21, for example, incomplete filling/shredding, impurities, contaminants, package cracks, bubbles, resin cracks, resin chips, and lead exposure The defects will form a dark area. The coaxial light source 2A is preferably interconnected with the annular light shield 8 such that the coaxial light source 2A is located between the lens 5 of the photographing device 4 and the annular light source 2B. The coaxial light source 2A and the annular light source 2B are disposed in the same manner, and the light source is irradiated toward the translucent device 10 to be detected.

Preferably, the illumination device 2 of the visual inspection illumination device of the present invention preferably illuminates the target region with a red light wavelength. However, the present invention also uses other defect regions that illuminate the translucent device 10, regardless of the defect region. The wavelength of the light wave of shape or depth.

The invention can visually detect the illumination device for at least two detection operations, and the light source of one of the light sources passes through the diffusion ring light B generated by the at least one light splitting device 6, so that at least two light sources having different light qualities are used. The combination of light sources forms an illumination that is accurate and can be used for detection by at least two detection standards.

Light from the different light sources 2A, 2B will be directed onto selected components of the translucent device 10. The incident light A from the coaxial light source 2A passes through the package surface up to the bottom of the package of the translucent device 10, and then, the reflected light C is reflected to the lens 5 of the photographing device 4. The image of the reflected light C reflected from the bright package surface by the photographing device 4 shows a defect-free package surface. Conversely, if the incident light A of the coaxial light source 2A is irradiated to a defective area, the incident light A is deviated toward the direction of the lens 5 of the photographing device 4, resulting in a dark area formed by the package defect region in the captured image (dark) ). The images intercepted by each reflection of the different types of defects are analyzed in the translucent device 10.

The translucent device 10 to be tested may be in-tape or other formation. The visual inspection illumination device of the present invention may or may not be provided between the illumination device 2 and the imaging device 4 for protecting the translucent device 10 Roll-up glazing (not shown).

As shown in FIG. 1, the illumination device 2 closest to the translucent device 10 and the translucent device 10 to be inspected have a preferred optical working distance (LWD) D to form an effective device to be detected. illumination. The optimum range of the optical working distance (LWD) D is 5 to 15 mm, but other ranges are also possible.

The illumination of the present invention reveals packaging defects of various features on the translucent device 10 to adequately illuminate the defective regions, reducing the under-rejection phenomenon when using a single illumination device. As is apparent from the images taken using the visual illumination device of the present invention shown in Figures 2 through 5, the present invention has sufficient illumination to detect defects that other conventional modes cannot detect. Referring to Fig. 2, the bubble defect detection image of the translucent device 10 of the present invention is shown in Fig. 2 with sufficient illumination so that the circular area in the bright image clearly shows the bubble defect. 3 is a chip-off defect and a void defect detection image of the translucent device 10 of the present invention, and FIG. 3 has sufficient illumination to clearly display a circular division in a bright image. The slit defect, and the square division area clearly shows the package hole defect. 4A and 4B are diagrams showing a concave defect detection image of the translucent device 10 of the present invention. The concave surface divided by a rectangle in FIG. 4A is represented by a bright area of an image, and FIG. 4B is composed of several rectangles. The divided concave surface is represented by a dark area of the image. The bright areas in Fig. 4A and the dark areas in Fig. 4B show the main concave surface defects of the translucent device 10 of the present invention. Please refer to Figure 5, It is the main scratch defect detection image of the translucent device 10 of the present invention, and the bright image with sufficient illumination in Fig. 5 clearly shows the main scratch defect of the detected translucent device 10.

2‧‧‧Visual inspection lighting device

2A‧‧‧ coaxial light source

2B‧‧‧Circular light source

21, 22‧‧‧LED

4‧‧‧Photographing device

5‧‧‧ lens

6‧‧‧Splitting device (diffuser)

61‧‧‧Central Perforation

8‧‧‧ ring mask

8A‧‧‧Base

8B‧‧‧ edge

8C‧‧‧ annular mask perforation

10‧‧‧Translucent device

12‧‧‧beam splitter

A‧‧‧ incident light

B‧‧‧Diffuse ring light

C‧‧‧ reflected light

D‧‧‧Light working distance

1 is a schematic perspective view of a preferred embodiment of the visual inspection illumination device of the present invention, wherein at least one optical path is from a source of the device and reflected light from the optical path.

Fig. 2 A translucent device of the present invention is used for detecting a test sample of a bubble defect.

Figure 3 The translucent device of the present invention is used to detect detected images of chip-off and void defects.

Figure 4A The translucent device of the present invention is used to detect a detected image of a concave defect.

Figure 4B The translucent device of the present invention is used to detect another detected image of a concave defect.

Fig. 5 A translucent device of the present invention is used for detecting a test sample of a main scratch.

2‧‧‧Visual inspection lighting device

2A‧‧‧ coaxial light source

2B‧‧‧Circular light source

21, 22‧‧‧LED

4‧‧‧Photographing device

5‧‧‧ lens

6‧‧‧Splitting device (diffuser)

61‧‧‧Central Perforation

8‧‧‧ ring mask

8A‧‧‧Base

8B‧‧‧ edge

8C‧‧‧ annular mask perforation

10‧‧‧Translucent device

12‧‧‧beam splitter

A‧‧‧ incident light

B‧‧‧Diffuse ring light

C‧‧‧ reflected light

D‧‧‧Light working distance

Claims (8)

A visual illumination device for a translucent device includes at least one illumination device and at least one photographic device, wherein the illumination device has a coaxial light source and an annular light source, and the coaxial light source is disposed between the photographic device and the annular light source The ring light source is disposed on a base of an annular reticle, and the annular reticle 8 has an edge located opposite to the base, so that the coaxial light source is adjacent to the annular reticle, and the ring The reticle base is provided with a perforation for penetration by the coaxial light source, the visual illumination device having at least one beam splitting device adjacent the edge of the annular reticle and located adjacent the translucent device. The visual illumination device of the translucent device of claim 1, wherein the spectroscopic device is a diffuser provided with a central perforation. The visual illumination device of the translucent device of claim 1, wherein the annular reticle perforation has a cross-sectional area of 10 mm by 10 mm. The visual illumination device of the translucent device of claim 1, wherein the annular light source is internally provided with a plurality of light emitting diodes having an angle of setting of 30 to 60 degrees. The visual illumination device of the translucent device of claim 1, wherein the coaxial light source is perforated through the annular reticle disposed on the base of the annular reticle to provide illumination to a target area for detection. The visual illumination device of the translucent device of claim 5, wherein the coaxial light source is internally provided with a plurality of light-emitting diodes having an observation angle of 30 to 60 degrees or more. The visual illumination device of the translucent device of claim 1, wherein the illumination light of one of the light sources penetrates the light splitting device to generate a diffused annular light source to enable at least two light sources having different light qualities. The light sources are combined to form an illumination for simultaneous use of at least two inspection operations. The visual illumination device of the translucent device of claim 1, wherein the distance between the visual inspection illumination device closest to the translucent device and the translucent device is 5 to 15 mm.