TWI470214B - Optical testing equipment and methods - Google Patents

Description

Optical detection device and method

The present invention relates to an optical detection apparatus and method.

Due to the rise of electronic products, many industries have flourished, such as factories that specialize in the production of electronic components. However, due to the increasingly complex construction of electronic components inside electronic products, it is inevitable to test various electronic components before assembling electronic products to ensure the yield to consumers at the time of shipment.

Referring to FIG. 1, an optical inspection architecture includes a camera 61 and a ring lamp 62. When the optical detection architecture is used to detect a sample to be tested 63, the object to be tested 63 is placed in the center of the ring lamp 62, and the ring lamp 62 is located between the camera 61 and the object to be tested 63 and passes through the ring. The lamp 62 emits light so that the diffused light of the object 63 is captured by the camera 61. However, when the object to be tested 63 has a curved edge 631, the light emitted from the ring lamp 62 will be on the curved edge 631, and the incident angle will be equal to the reflection angle as shown in FIG. Just as the positive reflection of the camera 61 is incident, the camera 61 receives too much light in the areas due to the regular reflection, so that as shown in Fig. 3, two mutually spaced overexposures appear on an image 64. Bright band 641, and the two over-exposure bands 641 are from The two curved edges 631 of the object to be tested 63 cause the detection of the object 63 to be detected again, and it is impossible to distinguish whether the two overexposure bands 641 have a problem.

Accordingly, it is an object of the present invention to provide an optical detecting apparatus capable of detecting an object having a curved edge.

Therefore, the optical detecting device of the present invention is for detecting a curved surface object to be tested, and comprises: a camera and a ring lamp. The camera faces the curved object to be tested at intervals. The ring lamp is located between the camera and the object to be tested, and has a center at a line connecting the camera and the object to be tested, and the ring lamp is divided into a second light-emitting portion that emits light at different times. a first light-emitting portion, the second light-emitting portion and the first light-emitting portion respectively emit light toward the arc-shaped object to be tested, and the light rays are diffused to the camera on the surface of the object to be tested on the curved surface to form a first An image and a second image.

Preferably, the camera has a photosensitive charge coupling device and a lens disposed between the ring lamp and the charge coupling device.

Preferably, wherein the annular lamp has a circular cross section.

Preferably, the second light emitting portion and the first light emitting portion are symmetrically divided from the ring light, so that the cross sections of the first light emitting portion and the second light emitting portion are respectively semicircular.

Preferably, the optical detecting device further includes a control unit for controlling the second light emitting portion and the first light emitting portion to emit light in turn.

Another object of the present invention is to provide a detectable tool An optical detection method for a curved edge test object.

The method comprises the step of illuminating a first illuminating portion of a ring light toward a curved surface object to be tested. A camera diffuses light from the curved surface object to form a first image and detects it. A second light emitting portion of the ring light is illuminated toward the arc surface object. The camera draws light from the curved surface of the object to be tested to form a second image and detects it. Comparing the first image with the second image to find out whether the arc surface object is flawed.

Preferably, the second light emitting portion is divided from the ring light symmetrically with the first light emitting portion.

The effect of the invention is that the arc having the curved edge can be accurately detected by dividing the ring lamp into the second light-emitting portion and the first light-emitting portion, and the flashing light, and performing two more shots. Whether or not the object to be tested has flaws can indeed achieve the object of the present invention.

1‧‧‧ camera

11‧‧‧Charge-coupled device

12‧‧‧ lens

2‧‧‧ ring lights

21‧‧‧Second light department

22‧‧‧ first light department

3‧‧‧Control unit

4‧‧‧Arc surface test object

41‧‧‧ curved edges

51‧‧‧Second image

511‧‧‧Over exposed light strip

52‧‧‧ first image

521‧‧‧Over exposed light strip

61‧‧‧ camera

62‧‧‧ ring lights

63‧‧‧Test objects

631‧‧‧Arc edge

64‧‧‧Image

641‧‧‧Over exposed light strip

Other features and advantages of the present invention will be apparent from the detailed description of the preferred embodiments illustrated in the accompanying drawings in which: FIG. 1 is a schematic diagram illustrating the prior art; FIG. 2 is a partially enlarged schematic view of the prior art; Is a schematic view showing an image taken by the prior art; FIG. 4 is a schematic view showing a preferred embodiment of the optical detecting device of the present invention; and FIG. 5 is a bottom view showing a curved surface of the preferred embodiment The relative positional relationship between the object and a ring lamp; 6 is a schematic view showing a first image taken by the preferred embodiment; FIG. 7 is a schematic flow chart of the optical detecting method of the present invention; FIG. 8 is a schematic view showing the preferred embodiment; and FIG. A second image taken by the preferred embodiment is illustrated.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to FIG. 4 and FIG. 5, a preferred embodiment of the optical detecting device of the present invention is for detecting an arc-shaped object to be tested 4, and comprises: a camera 1, a ring lamp 2 and a control unit 3. The camera 1 faces the arc-shaped object to be tested 4 at intervals. The ring lamp 2 is located between the camera 1 and the arc-shaped object to be tested 4, and its center is located on the line connecting the camera 1 and the arc-shaped object to be tested 4. The ring lamp 2 is divided into ones that are not illuminated at the same time. The second light-emitting portion 21 and a first light-emitting portion 22, and specifically, the ring-shaped lamp 2 has a lamp holder 23 and a plurality of LED lamps disposed on the lamp holder 23, and the LED lamps face the curved surface The object to be tested 4, and half of the number of LED lamps 24 belong to the second light-emitting portion 21, and the other half of the number of LED lamps 24 belong to the first light-emitting portion 22, in other words, the LED lamps 24 are divided into two parts. Glowing. The control unit 3 is configured to control the second light emitting portion 21 and the first light emitting portion 22 to alternately emit light. The first embodiment of the ring light 2 is only an example, and the present invention is not limited thereto. In detail, the camera 1 has a photosensitive area array charge coupled device 11 (Area CCD), and a ring is disposed on the ring. Lamp 2 and the charge coupled device 11 lenses 12 . The arc-shaped object to be tested 4 has two curved edges 41 facing the camera 1. The cross-section of the ring lamp 2 can be a perfect circle, a square or the like, but is optimal in a perfect circular shape. The second light emitting portion 21 and the first light emitting portion 22 are symmetrically divided from the ring light 2, and the curved surface object to be tested 4 is located at the center of the ring light 2, and the two curved edges 41 are respectively adjacent to the second light emitting portion The portion 21 and the first light emitting portion 22.

Referring to Fig. 7, the optical detecting method of the preferred embodiment will be described next. First, in step S1, the first light emitting portion 22 of the ring lamp 2 is illuminated toward the arc surface to be tested 4. As shown in FIG. 4, since the first light-emitting portion 22 of the ring-shaped lamp 2 is adjacent to the half-side of the arc-shaped object 4, only the arc of the object to be tested 4 is adjacent to the arc of the first portion The shaped edge 41 produces a regular reflection, while the curved edge 41 on the other side does not.

Step S2: The camera 1 captures the light diffused from the curved surface object 4 to form an image 5 and performs detection. As shown in FIG. 6, a first image 52 generated after the first light-emitting portion 22 emits light has only an over-exposure light strip 521, so that when the first image 52 is detected, the over-exposure will be avoided. The part of the bright band 521.

Step S3 - the second light-emitting portion 21 of the ring-shaped lamp 2 is illuminated toward the arc-shaped object to be tested 4. As shown in FIG. 8, since the second light-emitting portion 21 of the ring-shaped lamp 2 is adjacent to the other half of the arc-shaped object 4, only the arc of the object-to-be-measured object 4 adjacent to the second light-emitting portion 21 is adjacent. The shaped edge 41 produces a regular reflection.

Step S4: The camera 1 captures the light diffused from the curved surface object 4 to form a second image 51 and performs detection. As shown in Figure 9. The second image 51 generated after the second light-emitting portion 21 emits light has only an over-exposure bright band 511. Therefore, when the second image 51 is detected, the portion having the over-exposed bright band 511 will be avoided. .

Step S5 - comparing the first image 52 with the second image 51 to find out whether the arc surface test object 4 has flaws. The first image 52 and the second image 51 respectively generated by the second light emitting portion 21 and the first light emitting portion 22 are overlapped, and the overexposed bright band 521 and the overexposed bright band 511 are avoided. It can be completely confirmed whether the arc surface test object 4 has flaws.

As described above, by dividing the ring lamp 2 into the second light-emitting portion 21 and the first light-emitting portion 22, and the flashing light, and performing two separate shooting operations, it is possible to accurately detect the arc. Whether or not the arc-shaped object 4 of the shaped edge 41 has flaws can indeed achieve the object of the present invention.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and patent specification content of the present invention, All remain within the scope of the invention patent.

1‧‧‧ camera

11‧‧‧Charge-coupled device

12‧‧‧ lens

2‧‧‧ ring lights

21‧‧‧Second light department

22‧‧‧ first light department

3‧‧‧Control unit

4‧‧‧Arc surface test object

41‧‧‧ curved edges

Claims (5)

An optical detecting device for detecting a curved surface object to be tested, comprising: a camera facing the arc surface to be tested at intervals; and a ring lamp located between the camera and the curved surface object to be tested, and The central position is on a line connecting the camera and the arc-shaped object to be tested, and the ring-shaped lamp is divided into a second light-emitting portion and a first light-emitting portion that emit light at different times, and the second light-emitting portion and the first light-emitting portion Illuminating the object to be detected on the arc surface, respectively, and the light is diffused to the camera to form a first image and a second image respectively on the surface of the object to be tested, wherein the second light emitting portion and the second light A light emitting portion is symmetrically divided from the ring light, so that the cross sections of the first light emitting portion and the second light emitting portion are respectively semicircular. The optical detecting device of claim 1, wherein the camera has a photosensitive charge coupling device and a lens disposed between the ring lamp and the charge coupled device. The optical detecting device of claim 1, wherein the annular lamp has a circular cross section. The optical detecting device of claim 3, further comprising a control unit, configured to control the second light emitting portion and the first light emitting portion to emit light in turn. An optical detecting method comprising the steps of: illuminating a first illuminating portion of a ring lamp toward an arc-shaped object to be tested; and using a camera to extract a light diffused from the arc-shaped object to be tested to form a first image and performing Detection Lighting a second light-emitting portion of the ring-shaped lamp toward the arc-shaped object to be tested; using the camera to extract a light diffused from the arc-shaped object to be tested to form a second image and detecting; and the first image Comparing with the second image alignment to find out whether the arc surface object has flaws, wherein the second light emitting portion is divided from the ring light symmetrically with the first light emitting portion.