JPS61279144A - Defect detecting apparatus for pin piece of electronic part - Google Patents

Abstract

PURPOSE:To detect the abnormality of pin pieces, by obliquely inputting light beams with respect to the aligning direction of the pin pieces, detecting the light beams, which are transmitted at the outside of the pin pieces as one- dimensional pictures, and judging whether the interval between images is within the allowable range or not. CONSTITUTION:The light beams from a light source 13 are inputted toward a part between both pin-piece lines from the oblique lower direction of an IC element 1. The light beams, which are transmitted through the pin-piece lines, go obliquely over the horizontal plane. The images of the light beams are formed on an image sensor 16. Since the light beams, which are transmitted through the pin-piece lines obliquely, are captured, the far and near pin pieces appear as the difference in the images, which are formed on a light receiving sensitive part.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a device for detecting defects in legs of electronic components such as IC devices. The present invention relates to a device for detecting bends or chips 1 (4) in legs of parts mainly in a direction perpendicular to the alignment direction.

<Prior art> An electronic component consisting of a base body and a plurality of leg pieces connected to both sides of the base body is inserted into a plurality of holes made in advance at corresponding locations on a circuit board, etc., and the electronic component is connected to a circuit. In recent years, this type of insertion work has been performed using high-speed automatic insertion devices. In this case, the positional relationship of the phase n of the multiple pores on the circuit board is predetermined, so if some of the legs of the electronic component are bent, it will be difficult to insert the electronic component onto the circuit board. This can lead to inconveniences such as a final product being manufactured with some electronic parts missing or having to stop work and remove defective products from the line.

Therefore, before fixing electronic components to the circuit board, check the connection state of the legs and check if the legs are too bent and cannot be inserted into the holes in the circuit board 1-. It is necessary to remove it. Conventionally, a light beam is applied to each of the legs 11 of the number of parts, C, ('s 6 = 1 light is detected, and the image is compared with the positional relationship of the leg j1 of the normal part. , the electronic components are placed on the circuit board (if the two match or there is a slight error)
Items that were difficult to fix were considered acceptable and items that were defective were removed from the line.

In order to detect bending in a direction perpendicular to the alignment direction of the leg pieces of the electronic component, a light beam is irradiated from the rear of the leg piece so as to be almost perpendicular to the leg piece, and in front of the leg piece 11. Alternatively, it has been considered to detect the condition of the leg from behind as a two-dimensional image, and to compare and contrast this image with an image of a normal leg to detect whether the leg is at fault.

<Problems to be solved by the invention> However, in this method, the light source or the detection unit is
Alignment 1) This may become an obstacle when transporting and covering electronic components, and may cause the light source, 13I, and detection unit to be movable. j
*It becomes a country φη.

However, in order to capture the image of one leg piece from the alignment direction of the leg pieces, the depth of the leg l-1 row is t1 shi, bu, object jJ)7
It requires a large optical system or strictly parallel light beams using a rake 9 rays, and has disadvantages such as the equipment is complicated and expensive.

<Means for Solving the Problems> In view of the shortcomings of the prior art, an object of the present invention is to provide the electronic component having a number of leg pieces aligned along both sides of a base body. A device 1 for detecting a defect in the leg 1 is configured to emit a light beam from between the rows of leg pieces on both sides of the base body approximately parallel to the bottom surface of the base body and obliquely to the alignment direction of the leg pieces. The light rays transmitted to the outside of the leg (1) are detected as one-dimensional images of two or more parts having different longitudinal directions, and the two or more linear images are detected. Compare the original images and find that the interval between the images of the leg pieces is 8! [An object of the present invention is to provide a defect detection device for a leg J) of an electronic component, which is characterized in that the fault of the front wiring piece is detected by determining whether or not it is within the specified range.

<Effect> In this way, since the required light ray is applied from an oblique direction,
The light source or IJ and the detection section can be provided at a position away from the transport direction of the electronic component, and since a one-dimensional sensor is used as the detection section, lateral movement is simple.

<Example> A specific example will be described in detail below with reference to the drawings in Attachment 1.

Figure 1 is from IC cord 1 with normal leg pieces.

The electronic component shown in FIG. A notch 5 for direction identification is provided at the front end of the base body 2. Conventionally, as shown by the arrow X, the leg piece 3
．． The bending of the leg piece 3 in the left and right direction in the direction of the arrow Y from the alignment direction of 4 was detected, but due to the convenience of transporting the IC element, or the need for an optical system with a large depth of focus, etc. There was a problem.

FIG. 2 is a schematic diagram showing a first embodiment of the device of the present invention.

A plurality of leg pieces 3.4 protrude from both left and right ends of the base body 2 having a flat rectangular cross section, and each leg piece 3.4 is bent downward near the base end. The IC element 1 is mounted so as to straddle the transport path 10, and is located between the rows of legs J13.4 on both the left and right sides at the bottom of the transport path 10, approximately
A sea urchin crest side mirror 11 is arranged at an angle of 5°.

Another opposite mirror 12 is installed diagonally below the opposite mirror 11,
The direction of the light rays from the light source 13 is changed by the refracting mirror 12.11, and the light rays are turned into one group of light rays pointing to the right in FIG. 2 (c).

A part of this group of light rays hits the part (1) of the leg piece 4 and is blocked, and the rest goes straight to the right of the leg piece 4 and is reflected 1711
4 From G, the course was changed downward in Figure 2,
The lens 15 connects the image onto the image sensors 13-16. This image becomes a silhouette image in which only the portion where the leg piece 4 is present is dark. The sensing part 16a of the sensor 1-16 is linear and captures a two-dimensional image of the part (I>) that intersects with the horizontal plane formed by the leg piece 4.

A pulse motor 17 having a built-in ball screw is connected to the sensor 1) 16, and the pulse motor 171JJ,
17 (as shown by the imaginary line in Figure 2) ``Move to the stone, change the position of the sensing part 16 a 'b in +1.'l, Near Knee < 1. Move lJ Sensing section 168
Nini 1, before moving and 1, i, Tatsumi j・)! , 7 paths of light enter and form an image /S'1. This image (,1
2. A one-dimensional image of the intersection (TI) of the horizontal line of the leg piece 4 in Figure 2.

be.

FIG. 33 and/-Js-4 FIG. CI2, a side view and a plan view of the embodiment of FIG. d3, first, f side mirror 11 vertical opening = 1) S' faces in the horizontal direction.

Sub-to C1uQ=Jru1. -1 light source 13J: Reno Hikari I
J1, the light source that enters from diagonally below the front of the IC cord 1 between the rows of both legs j1 and passes through the row of legs J'7 travels diagonally across the horizontal plane and covers it. .

In this way, according to the present invention, the 11th row of legs is arranged in the diagonal direction (
In order to capture the 111 line (which passes through this line), it is connected to the sensing part, and the distance of leg j1 appears in the image as 3tU of the human leg of the image. As shown in Figure 5, each leg piece is
4:tirY of the lens is formed from point 1P on the sensing portion 16a as an image with a size proportional to the angle of the corresponding leg. Therefore, the leg pieces are 41 to 4 in order from the farthest one.
4, and if the angle of the famous leg piece from point P is 81 to a4, then al < a2 < a3 < a4. A similar relationship holds true for the intervals [)1 to [)3 between the respective leg pieces.

Therefore, when the image sensor is scanned 111 times, two waveforms as shown in FIG.
The pulse widths A1-A4 corresponding to 1-44 are proportional to the corresponding angles 81-a4. By correcting the influence of this J-shaped perspective difference based on the geometric relationship, it is possible to improve the accuracy of determining the bending of the leg.

The waveform diagram shown in FIG. 6 was obtained from a normal leg, and the pulses obtained at two positions (T) (TI>) of the leg 4 set at intervals in the vertical direction. The timings are consistent and the pulse intervals are within a predetermined tolerance.

In Fig. 7, the leg piece 41 is bent inward, and the leg piece 43 is bent outward. In the waveform shown in FIG. 8, each leg J"+"
All pulse glue and timing corresponding to 11 to 44 are -
・Is the interval between adjacent overlapping pulses appropriate?
The leg piece 43 is straight in the vertical direction and b
It can be seen that the other leg is protruding from the outside of the rim.

According to the present invention, it is possible to determine whether the leg is bent or missing in the medial-lateral direction, that is, in the left-right direction, but if the leg is bent in the front-back direction, that is, in the alignment direction of the legs H. will also be affected by this.

Detect the bending of the leg in the front and back direction separately,
If the bending in the front and rear direction is outside the range of curvature, it may be removed by recklessly rejecting it, or the present invention may be carried out by considering the influence of the bend in the front and rear direction based on the geometrical relationship. Q.

Figure 9 L-11 is a schematic diagram showing a second embodiment of the device based on the present invention, in which the same members as in the first embodiment are designated by the same reference numerals 61 and 9.
The detailed explanation will be omitted.

-〇- The group of light beams whose course was changed to the right by the mirror 11 on the opposite side is changed to the downward direction by the reflecting mirror 18, and the path is changed downward by the lens 15 to the sensor. An image corresponding to the soil part ('I) of the leg j114 is formed on the sensitive part 16a of the leg j114. Next, the reflector 18 is tilted t! as shown by the imaginary line J-. However, as in the first embodiment, the leg piece 4
An image corresponding to the lower part (IT) of 4 and η is formed on the sensitive part 16a of the sensor 16. Therefore, by determining the distance between the legs in a masterpiece and comparing the two images, it is possible to distinguish between acceptable products and defective products.

In this embodiment, the anti-q1 mirror 18 is constructed by, for example, connecting a pair of strip wires below, leaving space on both sides to install the pole tips, and passing current through the strip wires. It may be of a structure called a so-called galvanic mirror, which can be tilted in any direction.Also, in the tenth embodiment, an incandescent lamp such as a Yokagen lamp is used as the light source, but any type of light source may be used. A light source can be used, and if necessary, a laser beam can be used.

<Effects of the Invention> According to the present invention, since transmitted light is used, 41 points in the left and right direction of the leg piece 1 are not affected by the surface condition of the leg piece 1.
' / position can be reliably detected as a one-dimensional image. However, since the detected image is one-dimensional and does not require the use of an optical system with a large depth of focus or a 1" beam, the device does not become complicated and high-speed operation is possible. Therefore, the effect in terms of operation and performance-1- is great.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the electronic component showing the bending of the leg piece using imaginary lines. FIG. 2 shows a first embodiment of the apparatus according to the present invention, and FIGS. 3 and 4 are schematic front views showing the main parts of the embodiment shown in FIG. 2, respectively. They are a side view and a top view. Figure 5 k1. FIG. 7 is an explanatory diagram showing the size relationship of corresponding leg images depending on the distance difference between the legs. 6 to 8 are waveform diagrams of signals 1q received from the image controller. FIG. 9 shows a second embodiment of the device according to the invention.
This is a schematic diagram. 1...IC element 2...Base 3.4...Leg 14 h...Notch 10/publication path 1
1.12...Anti-0-1 mirror 13...Light source 1
4...Reflector 15...Lens 16...1
=Nri 16a...Sensing section 17...Pulse motor 18...Reflector

Claims (1)

[Claims] In an apparatus for detecting a defect in a leg of an electronic component having a plurality of legs arranged along both sides of a base, a light beam is emitted from between rows of legs on both sides of the base. The light rays are incident approximately parallel to the bottom surface of the base body and obliquely to the alignment direction of the leg pieces, and transmitted to the outside of the leg pieces, at two or more different length directions of the leg pieces. detect the part as a one-dimensional image, compare the two or more one-dimensional images, and determine whether the interval between the images of the leg piece is within an allowable range to detect an abnormality of the leg piece. A defect detection device for a leg piece of an electronic component.