JPH04241499A - Transferring head for electronic part - Google Patents

Abstract

PURPOSE:To hide nozzles which do not suck an electronic part behind a light diffusion plate to allow clear observation of the electronic part by providing the light diffusion plate which has a hole for passing a selected nozzle through so that it can freely protrude and retreat and is rotated by being drawn by the nozzle. CONSTITUTION:A light diffusion plate 14 is provided below a transferring head 1, and an electronic part P is sucked by a nozzle 4a protruding from the light diffusion plate 14. If a motor 10 is driven with a nozzle 4 protruding, the nozzle 4 rotates with a rotation axis 3 as the center, when also the light diffusion plate 14 is rotated by being drawn by this passing nozzle 4. The nozzle 4a protrudes from a hole 19, while other nozzles 4b to 4d are hidden behind the light diffusion plate 14. Therefore the other nozzles 4b to 4d do not interfere with observation by a camera 25, so that only the electronic part P can be clearly observed as a black object against a bright background.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a transfer head for electronic components, and more specifically, in order to observe electronic components attracted to a nozzle with a camera, light emitted from a light source is reflected toward the camera side. This invention relates to the arrangement structure of a light diffusing plate.

0002

2. Description of the Related Art While an electronic component is being attracted to a nozzle of a transfer head and being transferred and mounted on a board, the electronic component is observed with a camera to detect any positional deviation of the electronic component.

FIG. 10 shows how an electronic component is observed using conventional means. In the figure, 101 is a transfer head, which has a plurality of nozzles 102a to 102d (nozzle 102d is not shown).

[0004] Among the plurality of nozzles 102a to 102d, the nozzle 102a most suitable for the electronic component P is selected, and the electronic component P is attracted to this nozzle 102a. 103 is a camera for observing the electronic component P from below;
4 is a ring-shaped light source.

[0005] At the lower part of the transfer head 101, a light diffusing plate 105 such as a white acrylic resin plate is attached. The light emitted from the light source 104 is reflected downward by the light diffusing plate 105, and the silhouette of the electronic component P is observed in black against the bright background.

FIG. 11 shows an image observed by the camera 103. Q is the inspection frame of the camera 103, and l is the lead of the electronic component P.

[0007]

However, with the above conventional means, when the electronic component P is large, other nozzles 102b to
102d are present near lead l, and these nozzles 1
02b to 102d are also observed in black like lead 1. Therefore, the nozzles 102b to 102b become obstacles,
There was a problem in that the leads 1 could not be observed clearly and the positional deviation of the electronic component P could not be precisely detected.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a transfer head that eliminates the adverse effects of other nozzles that are not picking up electronic components and allows for clear observation of large electronic components.

[0009]

[Means for Solving the Problems] The present invention includes a plurality of nozzles that rotate around a rotating shaft, a motor that rotates the rotating shaft, and a nozzle that is selected from the plurality of nozzles and lowers the nozzle. a lowering means; a light diffusing plate that is rotatably provided below the plurality of nozzles, has a hole through which the selected nozzle can be protruded and retracted, and is rotated by being towed by the nozzle; The head for transferring electronic components is made up of:

0010

[Operation] In the above structure, the selected nozzle penetrates the hole of the light diffusing plate and attracts the electronic component. Next, light is irradiated toward the light diffusion plate and the silhouette of this electronic component is observed using a camera, but in this case, other nozzles that are not picking up electronic components are hidden behind the light diffusion plate. , these nozzles are not observed by the camera at all, and only the black silhouettes of the electronic components can be clearly observed against the bright background.

[0011]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of the transfer head 1. As shown in FIG. Reference numeral 2 denotes a main body case, in which a vertical rotation shaft 3 is provided. M is a motor that rotates the rotating shaft 3. A plurality of nozzles 4 (4a, 4b, 4c) are arranged around the rotating shaft 3.
, 4d) are provided (see also FIG. 2). The nozzle 4 is attached to the lower part of the nozzle shaft 5. A bracket 6 surrounds the nozzle shaft 5, and a lever 7 is pivotally attached to the bracket 6 by a pin 10. A ring-shaped spring material 9 is attached to the lever 7, and a hook 7a formed at the lower end of the lever 7 engages with an engaging portion 8 formed in a notch in the nozzle 4 by the spring force of the spring material 9. match.

A coil spring 11 is attached to the nozzle shaft 5. This coil spring 11 is
The nozzle 4 is urged downward. 12 is a block attached to the lower part of the rotating shaft 3, and the nozzle 4 is fitted into this block 12 so as to be movable up and down. Therefore, when the rotating shaft 3 and the block 12 rotate, the nozzle 4 also rotates on the rotating shaft 3.
Rotate around.

A cylinder 13 is provided on the side of the lever 7. When the rod 13a of the cylinder 13 protrudes, the lever 7 rotates counterclockwise about the pin 10, and the hook 7a separates from the engaging portion 8. Then nozzle 4
is lowered by the spring force of the coil spring 11 and protrudes from a hole 19 (described later) of the light diffusing plate 14. That is, the cylinder 13 serves as a means for lowering the nozzle 4. Of course, instead of the cylinder 13, other means such as cam means may be used to press the lever 7 and lower the nozzle 4.

A light diffusing plate 14 is provided below the nozzle 4 so as to cover the nozzles 4a to 4d. This light diffusing plate 14 is rotatably attached to the lower part of the main body case 2 via a bracket 15. A plate spring 16 for position regulation is attached to the main body case 2. This leaf spring 1
6 is elastically fitted to the bracket 15 and determines the rotational position of the light diffusing plate 14. 20 is a rotary head, 21 is a guide rail provided on this rotary head 20, and 22 is a slider that fits into this guide rail 21, and guides the lifting and lowering of the transfer head 1.

A hole 19 is formed in the light diffusing plate 14, and when the nozzle 4 is positioned directly above the hole 19,
When the hook 7a is disengaged from the engaging portion 8 as described above, the nozzle 4 protrudes through the hole 19 in a freely projectable and retractable manner. When the motor 10 is driven with the nozzle 4 protruding, the nozzle 4 rotates around the rotating shaft 3, and at this time, the light diffusing plate 14 is also rotated by being pulled by the nozzle 4 passing through it.

Reference numeral 25 represents a camera provided below the moving path of the transfer head 1, and reference numeral 26 represents a ring-shaped light source. When the transfer head 1 moves above the camera 25, light is emitted from the light source 26 toward the light diffusing plate 14, and the light is reflected downward by the light diffusing plate 14. A black silhouette of P is observed. 1 is a lead of the electronic component P.

FIG. 3 is a plan view of the electronic component mounting apparatus. 20 is a rotary head, and a large number of the above-mentioned transfer heads 1 are provided along the circumferential direction of the rotary head. An electronic component supply device 31 is installed behind the rotary head 20. 32 is a moving table on which a pallet 33 is placed. A large number of feeders 34 for electronic components P, such as tape feeders and tube feeders, are placed on the pallet 33. 35 is a ball screw, and 30 is a motor for driving the ball screw 35. When the ball screw 35 rotates, the feeder 34 moves in the X direction, and a predetermined feeder 34 is stopped on the take-up stage G. An XY table 36 is provided on the front side of the rotary head 20. This XY table 36 moves the substrate 37 in the XY directions.

In FIG. 3, A is a mounting stage for mounting the electronic component P attracted by the nozzle 4 onto the substrate 37, and B is a return stage for returning the light diffusing plate 14 to its original position. The original position is a position where the selected nozzle 4 can protrude from the hole 19.

C is a drop stage for dropping the defective electronic components P whose mounting on the board 37 has been canceled through the nozzle 4, and D is a drop stage for dropping the defective electronic components P whose mounting on the board 37 has been canceled;
E is a storage stage that moves the light diffusing plate 14 upward and stores it; E is a nozzle selection stage that positions the nozzle 4 suitable for the next electronic component directly above the hole 19; F is a cylinder 1;
G is a nozzle ejection stage in which the selected nozzle 4 is protruded from the hole 19 by protruding the rod 13a of No. 3, G is a take-up stage in which the electronic component P of the feeder 34 is sucked to the nozzle 4, and H is a take-up stage. preliminary stage, I
is the electronic component P attracted to the nozzle 4 by the camera 25.
Observation stages J, K, and L are correction stages that rotate the motor 10 to correct the positional deviation of the electronic component P in the rotational direction. By index rotation of the rotary head 20 in the direction of arrow N, the transfer head 1 circulates through each of the stages A to L.

FIGS. 4(a) and 4(b) show each stage A
~G nozzles 4 (4a to 4d) and light diffusing plate 14
It shows the positional relationship of In FIG. 4(a), the black nozzle 4 is connected to the light diffusing plate 14 in order to adsorb the electronic component P.
The nozzle is shown protruding from the Also, Figure 4(b)
, the double ring shows a state in which the nozzle 4 protrudes from the hole 19. Next, the operation will be explained with reference to FIGS. 3 and 4.

The transfer head 1 that has taken up the electronic component P on the take-up stage G moves to the observation stage I, and the electronic component P attracted to the nozzle 4 is observed by the camera 25. FIG. 1 shows a state in which an electronic component P attracted by a nozzle 4a is observed. The nozzle 4a protrudes from the hole 19, and the other nozzle 4b
~4b is hidden behind the light diffusing plate 14 (see also stage G in FIG. 4). Therefore, other nozzles 4b to 4d
does not interfere with the observation by the camera 25, and only the electronic component P can be seen in the bright background as shown in FIG.
It is clearly observed as black. Q is an inspection frame of the camera 25.

Next, in stages J to L, the motor 10 is driven to rotate the nozzle 4a around the rotating shaft 3, and the positional deviation of the electronic component P in the rotational direction is corrected. Note that the positional deviation of the electronic component P in the XY direction is
The correction is made by driving the table 36 and moving the substrate 37 in the XY directions.

Next, the mounting head 1 moves to the mounting stage A, and as the transfer head 1 moves up and down along the rail 21, the electronic component P is mounted on the board 37 (see also stage A in FIG. 4).

Next, the transfer head 1 moves to the return stage B, and as the motor 10 rotates, the light diffusing plate 1
4 returns to the original position (see also stage B in Figure 4).

Next, the transfer head 1 moves to the drop stage C, and further moves to the nozzle storage stage D. Fig. 6 shows the nozzle storage stage D (Fig. 4 stages C and D).
(see also). 41 is a cylinder as a nozzle storage means, and when the rod 41a rises, the nozzle 4
This nozzle 4a is housed by pushing up the nozzle 4a above the light diffusing plate 14 and engaging the hook 7a with the engaging portion 8.

Next, the transfer head 1 moves to the nozzle selection stage E. Here, by driving the motor 10, the nozzles 4a to 4d rotate around the rotating shaft 3, and a predetermined nozzle 4b is located directly above the hole 19 (see also stage E in FIG. 4).

Next, the transfer head 1 moves to the nozzle protruding stage F. When the rod 13a of the cylinder 13 protrudes here, the nozzle 4b descends and the light diffusing plate 1
4 (see also stage F in Figure 4).

Next, the transfer head 1 moves to the take-up stage G, sucks the electronic component into the selected nozzle 4b, and takes it up. By repeating the above operations, the electronic components P of the feeder 34 are transferred to the substrate 37.
will be installed in sequence.

By the way, some electronic components are smaller than the size of the hole 19 described above. The diameter of the nozzle that attracts such small electronic components is also extremely small. Therefore, when such a small electronic component is attracted to a small-diameter nozzle and observed with the camera 25, the electronic component enters the hole 19 and cannot be recognized by the camera 25. For example, such a small electronic component is 0 on one side.
．． There are resistor chips of 5mm or less.

FIG. 7 shows a means for observing such a small electronic component Pm. One side of the electronic component Pm is 0.5 mm, and the diameter of the nozzle 4e is 0.3 mm. The diameter of the hole 19 is 4 mm so that a large diameter nozzle can pass through it. Of course, these numbers are exemplary.

[0032] The upper part of this nozzle 4e has a large diameter part 4e'.
is provided. The tapered surface a of this large diameter portion 4e' serves as a light diffusing surface. Therefore, this electronic component Pm is observed as a black silhouette within the bright tapered surface a.

As shown in FIG. 8, the lower surface b of the large diameter portion 4e'
may be a flat light-diffusing surface. Further, as shown in FIG. 9, the nozzle 4f may be tapered, and its tapered surface c may be a light diffusing surface. As described above, various shapes of the nozzle can be considered, and the point is that the nozzle should be provided with a large diameter part larger than the electronic component Pm, and this large diameter part should be used as a light diffusing surface.

[0034]

As explained above, the present invention includes a plurality of nozzles that rotate around a rotating shaft, a motor that rotates the rotating shaft, and a motor that lowers a nozzle selected from the plurality of nozzles. and a light diffusing plate that is rotatably provided below the plurality of nozzles, has a hole through which the selected nozzle can be protruded and retracted, and rotates while being towed by the nozzle. Since the transfer head is made up of the following, nozzles that are not picking up electronic components do not interfere with observation, and electronic components can be observed clearly. In addition, even if the nozzles are placed close to each other, it will not interfere with observation, so a transfer head can be provided with many nozzles closely together, and therefore, it is possible to handle a wide variety of electronic components with different dimensions and external shapes. To accommodate this, the transfer head can be provided with a large number of nozzles.

[Brief explanation of the drawing]

[Figure 1] Cross-sectional view of the transfer head

[Figure 2] Perspective view of transfer head

[Figure 3] Plan view of electronic component mounting equipment

[Figure 4] Operation diagram of nozzle and light diffuser plate

[Figure 5] Observation diagram

[Figure 6] Side view of the nozzle being stored

FIG. 7: Side view of nozzle and other embodiments

FIG. 8: Side view of the nozzle and other embodiments

FIG. 9: Side view of another embodiment of the nozzle.

[Figure 10] Side view of conventional device

[Figure 11] Observation diagram

[Explanation of symbols]

1 Transfer head 3 Rotation axis 4a Nozzle 4b Nozzle 4c Nozzle 4d nozzle 4e Nozzle 4f nozzle 13 Lowering means 14 Light diffusion plate 19 Hole 10 Motor

Claims (1)

[Claims] 1. A plurality of nozzles that rotate around a rotation shaft, a motor that rotates the rotation shaft, a lowering means that lowers a nozzle selected from the plurality of nozzles, and a lowering means that lowers a nozzle selected from the plurality of nozzles; A light diffusing plate rotatably provided below the nozzle, having a hole through which the selected nozzle can be protruded and retracted, and rotated by the nozzle. Parts transfer head.