JP3053754B2 - Component mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a component mounting apparatus.

[0002]

2. Description of the Related Art There has been known an electronic component mounting apparatus as a component mounting apparatus for automatically installing (mounting) electronic components such as ICs, resistors, and LSIs at predetermined positions on a substrate, for example. . In this electronic component mounting apparatus, by rotating the electronic component that is sucked by the suction nozzle and is positioned in the optical path between the light emitting unit and the light receiving unit around the suction point, the electronic component is illuminated by the parallel light from the light emitting unit. Detecting the projected width of the picked-up component by the light receiving means, detecting the suction position shift of the suction nozzle with respect to the electronic component based on the detected rotational projection width, and detecting the mounting position correction amount of the suction nozzle based on the position shift On the other hand, during the detection, the head unit including the suction nozzle and the light emitting / receiving unit is moved XY toward the mounting position, and when the mounting position correction amount is acquired, the mounting based on the mounting position correction amount is performed. The electronic component can be mounted at a predetermined position on the substrate by moving the head portion to the correction position by moving the head XY.

[0003]

Here, when mounting electronic components on a substrate, high speed is required, so that the XY movement is performed at high speed including high acceleration / deceleration. I have. Therefore, during acceleration / deceleration during the XY movement,
An inertial force in a direction opposite to the acceleration / deceleration direction acts on the head portion (the suction nozzle, the electronic component sucked by the suction nozzle, and the light emitting / receiving means). When such inertia force is acting, if there is a difference between the mass of the light emitting / receiving unit and its mounting rigidity and the mass of the suction nozzle and its mounting rigidity, a relative positional shift occurs. Where, in general,
Since the rigidity of the light emitting / receiving means is high and the suction nozzle is provided at the tip of the relatively long rotating shaft, the rigidity of the whole (the suction nozzle and the rotating shaft are referred to as a suction member) is low. .

Accordingly, the suction member is bent during the XY movement, and this bending causes the suction nozzle center position during the XY movement (the center of the sucked electronic component) to be relatively different from the suction nozzle center position at rest. Position) will be shifted. That is, even if the suction position deviation of the suction nozzle with respect to the electronic component as described above is detected during the X-Y movement, this includes a displacement due to bending, and therefore, when the electronic component is stationary and mounted on the substrate, However, there is a problem in that the displacement due to the deflection is displaced from the position where it should be originally mounted, and the mounting position accuracy is reduced.

When the head moves in parallel to the parallel illumination light, that is, when the inertial force acts in parallel to the parallel illumination light, the bending occurs. This does not affect the detected projection width because it does not affect the detected projection width, but when moving in the direction perpendicular to the parallel illumination light, that is, the inertial force acts in the direction perpendicular to the parallel illumination light. In this case, there is a problem because the deflection affects the projection width detected.

In the present invention, therefore, during the detection of the projection width of the component during the X-Y movement of the head, the movement of the suction portion of the suction member in the direction orthogonal to the illumination light is at least restricted, and the mounting position correction amount is detected. It is an object of the present invention to provide a component mounting apparatus in which accuracy is improved and reliability and quality are improved.

[0007]

In order to achieve the above object, a component mounting apparatus according to the present invention includes a light emitting unit and a light receiving unit while rotating a suction member holding a component by suction around an axis of the suction member. Detecting the projection width of the component located in the optical path between, and based on the detected projection width, the component
In the component mounting apparatus, the light emitting / receiving unit is moved together with the suction member in the X-Y direction orthogonal to the axis while detecting the projection width while acquiring the mounting position correction amount. components in the projection width detection of the suction member, while regulating the moving direction perpendicular to the illumination light by at least said light emitting means of the X-Y direction, rotating the adsorbing member to the axis line It is characterized in that a supporting member for supporting the member is provided.

According to the component mounting apparatus in such a means, during the detection of the projection width, the vicinity of the suction portion of the suction member is orthogonal to the illumination light by the light-emitting means in at least the XY movement direction by the support member. It is supported so as to be rotatable around the rotation axis while the movement in the direction is regulated. Therefore, even if the inertial force due to the XY movement acts on the suction member in a direction orthogonal to the illumination light, the suction member does not bend.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. First, a schematic configuration of an electronic component mounting device as a component mounting device will be described below with reference to FIG. In FIG. 1, reference numeral 3 denotes, for example, a circuit board on which printed wiring is provided. The board 3 is provided with electronic components by belt conveyors (not shown) of supporting means 50a and 50b for supporting the board 3 in a horizontal state. It is transferred to a predetermined position on the mounting device.

In the vicinity of the substrate 3, a plurality of electronic component supply devices 2 are arranged at predetermined positions so as to sandwich the substrate 3 (the electronic component supply device 2 on the rear side of the substrate 3 in the figure becomes complicated. (Not shown). The electronic component supply device 2 is a so-called tape feeder, and the tape feeder 2 supports a component reel 1 made of, for example, paper or plastic. This component reel 1
Recesses are formed at predetermined intervals, and in each of the recesses,
For example, electronic components 6 such as ICs and LSIs (see FIGS. 2 to 4 for the electronic components 6) are accommodated, and the respective electronic components 6 can be sent from the component reel 1 to the tape feeder 2. . A plurality of tape feeders 2 supporting the component reels 1 are detachable from the electronic component mounting apparatus, and are arranged side by side.

Returning to FIG. 1, an X moving arm 5a slidable in the X direction in the figure is provided above the substrate 3 in the drawing.
Y that can slide on this X moving arm 5a in the Y direction in the drawing
A moving arm 5 including a moving arm 5b is provided, and the X moving arm 5a and the Y moving arm 5b are driven XY by driving means (not shown). The XY moving section of the moving arm 5 is provided with a head unit 4 for sucking an electronic component 6 as a component and placing the sucked and held electronic component 6 at a predetermined position on the substrate 3. Next, the head section 4 will be described below with reference to FIGS.

In FIG. 2 to FIG. 4, reference numeral 7 denotes a suction nozzle as a suction portion connected to the front end (lower end in the figure) of a hollow rotary shaft 7a whose axis is orthogonal to the XY plane. . The air inside the suction member 7X composed of the suction nozzle 7 and the hollow rotary shaft 7a is sucked by vacuum means (not shown), and the suction operation causes the electronic component 6 to be vacuum-sucked to the tip of the suction nozzle 7. I can do it.

As shown in FIG. 2, the rotary shaft 7a is supported by a bracket 9 disposed at the upper part of the drawing and connected to an output shaft of a suction nozzle rotary motor 8 fixed to the bracket 9. ing.

Therefore, when the suction nozzle rotation motor 8 is driven to rotate, the electronic component 6 sucked by the suction nozzle 7 rotates around the suction point.

A nut 10b is fixed to the bracket 9, and a ball screw 10a extending in the vertical direction (Z direction) in the figure is screwed to the nut 10b. The ball screw 10a is connected to the output shaft of a suction nozzle vertical movement motor 11, and the suction nozzle vertical movement motor 1
1 is fixed to the bracket 13. The bracket 13 is fixed to a frame 51 attached to the XY moving section of the moving arm 5.

Therefore, when the suction nozzle vertical movement motor 11 is driven to rotate in the positive or negative direction, this rotational movement is converted into linear movement by the ball screw 10a and the nut 10b, and together with the bracket 9, the suction nozzle rotation motor 8, The suction member 7X (rotary shaft 7a, suction nozzle 7)
It rises or descends while being guided by the guide member 12 fixed to the frame 51.

When the XY moving section of the moving arm 5 moves in the XY directions, the entire head section 4 shown in FIG.
It moves in the direction.

The head section 4 is also provided with a projection width detecting means 14. As shown in FIG. 4, the projection width detecting means 14 includes the rotating shaft 7 a and the suction nozzle 7.
The light-emitting portion 14a and the light-receiving portion 14b are disposed so as to face each other, and each end is fixed to the bracket 13 respectively.

The light emitting portion 14a has a laser diode (light emitting means) 15 serving as a light emitting source, a collimator lens 16 for converting light emitted from the laser diode 15 into parallel light, and a parallel light from the collimator lens 16 inside. And a total reflection mirror 17 that emits light in a direction parallel to the substrate 3 (X-Y direction) and guides the light toward the light receiving unit 14b that is opposed to the light receiving unit 14b.

The light receiving section 14b includes therein a light emitting section 14a.
Linear CCD (Charge Coupled Device; light receiving means) 18 for receiving parallel light reflected from the total reflection mirror 17
It has.

A support member 19 is provided between the light emitting portion 14a and the light receiving portion 14b and near the upper side of the optical path of the parallel light.
The plate 19b is fixed by passing over, this plate 19b, for example, stroke ball bearing 19a is fixedly fitted. The rotary shaft 7a constituting the suction member 7X is rotatably and slidably inserted into the stroke ball bearing 19a.

[0022] Therefore, when driving the suction nozzle vertical movement motor 11, the rotating shaft 7a is moved up and down while being supported by the support member 19 made from the stroke ball bearing 19a and the plate 19b. In addition, the suction nozzle 7
The electronic component 6 adsorbed on the mirror is connected to the total reflection mirror 17 and the linear C
When the suction nozzle rotation motor 8 is located between the CD 18 and the suction nozzle rotation motor 8, the rotation shaft 7 a rotates while the vicinity of the suction portion is supported by the support member 19. That is, in the in the projection width detection is positioned between the electronic component 6 total reflection mirror 17 and linear CCD 18, the suction member 7X, depending the support member 19 that will support the suction vicinity X-
The movement in the Y direction is restricted, and the rotation is supported.

Next, the operation of detecting the mounting position correction amount by the projection width detecting means 14 configured as described above, together with the electronic component suction / mounting operation, will be described below with reference to FIGS. First, the moving arm 5 is driven XY to move the head unit 4 to a predetermined position, and the suction nozzle vertical movement motor 11 is driven, for example, in the forward rotation direction to lower the suction nozzle 7 to move the predetermined electronic component 6. Then, the suction nozzle vertical movement motor 11 is driven, for example, in the reverse rotation direction, and the suction nozzle 7 is moved.
Is raised, and the sucked electronic component 6 is moved to the total reflection mirror 17.
When the suction nozzle 7 is positioned between the linear CCD 18 and the linear CCD 18, the lifting of the suction nozzle 7 is stopped.

Next, in this state, the moving arm 5 is driven XY to move the head unit 4 above a predetermined position of the substrate 3.
During this movement, the operation of detecting the mounting position correction amount by the projection width detecting means 14 is performed. That is, a laser beam is emitted from the laser diode 15 and the electronic component 6 is irradiated with parallel light to form a shadow thereof, and the linear CCD 18 receives the irradiated light (see FIG. 5A).

Next, the suction nozzle rotation motor 8 is driven, for example, in the forward rotation direction to pre-rotate the electronic component 6 together with the suction nozzle 7 by a predetermined angle around the suction point (see FIG. 5B).

Next, as shown in FIGS. 5C to 5E, the suction nozzle rotating motor 8 is driven, for example, in the reverse rotation direction to rotate the electronic component 6 in the direction opposite to the above-mentioned preliminary rotation. The projection width of the component 6 is continuously detected. Then, the relationship between the detected projection width and the rotation angle is determined when the longitudinal direction of the electronic component 6 becomes parallel to the parallel light as shown in FIG. The projection width becomes the width W of the electronic component 6 and becomes a minimum, and is rotated by about 90 ° from there, and the longitudinal direction of the electronic component 6 becomes
As shown in FIG. 5D, when the light becomes perpendicular to the parallel light (the rotation angle at this time is referred to as a second angle), the projection width becomes the length L of the electronic component 6 and temporarily decreases. .

Accordingly, by measuring the difference between the center of the projection width at the first angle and the second angle and the center of the known suction nozzle 7, the deviation of the suction nozzle 7 from the electronic component 6 in the X direction is measured. The deviation dY in the dX and Y directions can be obtained. Further, by detecting the rotation angle of the suction nozzle 7 at that time, the rotation deviation dθ of the suction nozzle 7 can be obtained.

The displacement dX in the X direction, the displacement dY in the Y direction, and the rotational displacement dθ thus obtained are corrected (see FIG. 5F), and the head unit 4 is moved above a predetermined position on the substrate 3. However, as described in the related art, during the detection of the projection width, the head unit 4 is moved to X-Y.
Due to the movement, the inertial force acts on the attraction member 7X to cause bending, and the obtained mounting position correction amount includes the deviation due to the bending. The component 6 is displaced from the position where the component 6 is to be mounted.

Therefore, in the present embodiment, the above-described support member 19 is provided, and even if an inertial force due to XY movement acts on the suction member 7X by the support member 19, the suction member 7X is not bent. This does not occur, so that the mounting position correction amount is accurately detected.

Then, the head unit 4 is moved XY to the correction position based on the correctly detected mounting position correction amount, and the suction nozzle vertical movement motor 11 is driven in the forward rotation direction to drive the suction nozzle 7. By lowering the electronic component 6 at a predetermined position on the substrate 3 and then stopping the vacuum for the suction nozzle 7, the electronic component 6 can be mounted at a predetermined position.

As described above, in the present embodiment, during detection of the projection width, the vicinity of the suction portion of the suction member 7X is moved to the support member 1X.
9 so as to be rotatable and slidable and to prevent the suction member 7X from bending even if an inertial force due to XY movement acts on the suction member 7X. The accuracy of detecting the position correction amount can be improved, and the reliability and quality can be improved.

FIG. 6 is an enlarged perspective view showing another embodiment of the support member, and FIG. 7 is a partially sectional front view of FIG. In this embodiment, for example, a rolling bearing 21 is fixed near the suction nozzle 7 on the rotating shaft 7a. That is, the inner ring 21a of the rolling bearing 21 is fitted in the vicinity of the suction nozzle 7 on the rotating shaft 7a, and the inner ring 21a is fitted and fixed in the illustrated vertical direction of the rolling bearing 21 on the rotating shaft 7 The movement in the vertical direction is restricted by 22a and 22b.

Further, between the light-emitting portion 14a and the light-receiving portion 14b and near the upper side of the optical path of the parallel light, the plates 24a and 24b are connected with the parallel light so as to interpose the suction member 19. It is fixed across the direction. Rollers 23a and 23b are rotatably supported by the plates 24a and 24b.
b are arranged so as to face each other in a direction orthogonal to the parallel light in the XY movement direction . Then, when the suction nozzle rotating motor 8 is driven and the electronic component 6 sucked by the suction nozzle 7 is positioned between the total reflection mirror 17 and the linear CCD 18, the rollers 23 a and 23 b are mounted on the outer ring of the rolling bearing 21. Position adjustment and gap adjustment are performed so as to abut each other and hold.

Therefore, when the electronic component 6 sucked by the suction nozzle 7 is positioned between the total reflection mirror 17 and the linear CCD 18, the vicinity of the suction nozzle 7 on the rotating shaft 7a, that is, the rolling bearing 21 is moved by the plates 24a, 24.
b, is rotatably supported by a support member 29 composed of rollers 23a and 23b. That is, during the detection of the projection width in which the electronic component 6 is positioned between the total reflection mirror 17 and the linear CCD 18, the suction member 7X is supported by the support member 29 that supports the vicinity of the suction portion.
The movement in the direction perpendicular to the parallel light in the X-Y movement direction is regulated and is rotatably supported.

As described above, in the present embodiment, during the detection of the projection width, the movement in the direction affecting the projection width (the direction orthogonal to the parallel light) is restricted. It goes without saying that a similar effect can be obtained.

FIG. 8 is an enlarged exploded perspective view showing still another embodiment of the support member. In this embodiment,
An annular convex portion 7ab is formed near the suction nozzle 7 on the rotating shaft 7a.

Further, between the light emitting portion 14a and the light receiving portion 14b and near the upper side of the optical path of the parallel light, the plates 31a and 31b are connected to the parallel light with the adsorbing member 7X. It is fixed across the direction. Guide members 32a and 32b are formed on the plates 31a and 31b so as to face each other, and the opposing surfaces 32aa and 32a of the guide members 32a and 32b are formed.
bb is a flat plane. When the suction nozzle rotating motor 8 is driven and the electronic component 6 sucked by the suction nozzle 7 is positioned between the total reflection mirror 17 and the linear CCD 18, the guide members 32a and 32b are attached to the annular convex portion 7ab. Position adjustment and gap adjustment are performed so that the opposing surfaces 32aa and 32bb abut against each other.

Therefore, when the electronic component 6 sucked by the suction nozzle 7 is positioned between the total reflection mirror 17 and the linear CCD 18, the vicinity of the suction nozzle 7 on the rotating shaft 7a, that is, the convex portion 7ab is formed by the plates 31a, 31b. , And is rotatably supported by a support member 39 composed of the guide members 32a and 32b. That is, the electronic component 6
The can be in a projected width detected to be positioned between the total reflection mirror 17 and linear CCD 18, the suction member 7X is by a support member 39 that will support the suction vicinity, X-
The movement in the direction perpendicular to the parallel light in the Y movement direction is restricted and the rotatable support is provided.

It is needless to say that the same effect as in the above embodiment can be obtained even with this configuration.

Although the invention made by the inventor has been specifically described based on the embodiment, the invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the invention. Needless to say. For example, the support member is not limited to the one described above. In short, during the detection of the projection width, the movement of at least the vicinity of the suction portion of the suction member 7X in the direction orthogonal to the parallel light illuminating the electronic component 6 is restricted. In addition, as long as it is a supporting member that rotatably supports around the axis, other configurations may of course be used.

[0041]

As described above, according to the component mounting apparatus of the present invention, the optical path between the light-emitting means and the light-receiving means while rotating the suction member holding the component around the axis of the suction member. While detecting the projection width of the component located in the middle and acquiring the mounting position correction amount based on the detected projection width, the detection unit detects the light emitting / receiving unit together with the suction member while detecting the projection width. in component mounting device designed to move an X-Y direction perpendicular to said axis, in the projection width detection, the suction vicinity of the suction member, the support member, the
At least one of the X-Y directions is supported so as to be rotatable about a rotation axis while restricting movement in a direction orthogonal to the illumination light by at least the light emitting means. Even when acting in a direction perpendicular to the suction member, the suction member is configured not to bend, so that the detection accuracy of the mounting position correction amount can be improved, and the reliability and quality can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a component mounting apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view specifically showing a head portion of the component mounting apparatus.

FIG. 3 is an enlarged partial cross-sectional front view of a tip end portion of a suction member, a support member, and a projection width detection unit of a head unit.

FIG. 4 is an enlarged perspective view of a tip end portion of a suction member of a head unit and a projection width detecting unit.

FIG. 5 is an explanatory plan view of the projection width detecting means, illustrating an operation of detecting a mounting position correction amount by the projection width detecting means.

FIG. 6 is an enlarged perspective view illustrating another embodiment of the support member.

FIG. 7 is a partial sectional front view of FIG. 6;

FIG. 8 is an enlarged exploded perspective view showing still another embodiment of the support member.

[Explanation of symbols]

 Reference Signs List 4 Head unit 6 Parts 7 Suction unit (suction nozzle) 7a Rotary shaft 7X Suction member 14 Projection width detection unit 15 Light emission unit 18 Light reception unit 19, 29, 39 Support member

Continuation of the front page (56) References JP-A-6-152193 (JP, A) JP-A-6-152194 (JP, A) JP-A-2-288399 (JP, A) JP-A-6-335888 (JP) , A) JP-A-7-202488 (JP, A) JP-A-6-21697 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H05K 13/04 H05K 13/08

Claims (1)

(57) [Claims] 1. A projection width of a component located in an optical path between a light emitting unit and a light receiving unit is detected while rotating a suction member holding a component by suction around an axis of the suction member. While detecting the mounting position correction amount of the component based on the projected width, while detecting the projected width, the light-emitting / light-receiving means together with the suction member is moved along the X-axis perpendicular to the axis.
In the component mounting apparatus that moves in the Y direction, in the projection width detection of the component, the suction member, the X-
While regulating the moving direction perpendicular to the illumination light by at least said light emitting means of the Y-direction, the adsorbing member
Component mounting apparatus characterized by a provided a support member for rotatably supporting the axis direction.