JPH11261298A - Electronic component mounting equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly detect the attitude of an electronic component held by a suction nozzle of a mounting head. SOLUTION: A hollow shaft installed in a mounting head which can freely move in the horizontal direction between above a component feeding part and above a mounting substrate is equipped with a suction nozzle 25. A light receiving element 71a which is isolated from the nozzle 25 and has a light receiving surface 71 along the direction rectangular to the center axis of the nozzle is installed on the mounting head. A lens 74 casting a light toward the light receiving element 71a via an electronic component E, and a light source group 76 having a plurality of light sources 76a-76h which are arranged in the direction rectangular to the optical axis P1 of the lens 74 and parallel to the light receiving surface 71 are installed on the mounting head. The light sources 76a-76h are turned on in order. On the basis of the size of shadow of the electronic component E, the rotation angle of the electronic component E to the suction nozzle 25 is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electronic component mounting apparatus for mounting electronic components such as semiconductor chips such as ICs and LSIs, diodes, and resistors on a mounting board.

[0002]

2. Description of the Related Art In order to mount electronic components such as semiconductor chips such as ICs and LSIs, capacitors, and diodes on mounting members such as mounting boards and inspection boards, electronic component mounting apparatuses called mounters and chip mounters are used. used. This mounting device has a mounting head that moves in a horizontal direction in order to transport electronic components housed in the component supply unit to a mounting board arranged adjacent to the component supply unit. Has a work holder attached so as to be vertically movable.

[0003]

An electronic component housed in a mounted member such as a mounting board has a predetermined posture. Usually, the electronic component is conveyed to the mounting board in the same posture, so that the The component is mounted in a desired posture on the mounting board. However, the posture of the work, that is, the electronic component in the component supply device is strictly uneven, and rotates around the central axis of the work holder when the electronic component is held by the work holder provided on the mounting head. The electronic component may be held by the work holder with a deviation in the direction. In particular, when a vacuum suction type suction nozzle is used as the work holder, there is no function to adjust the posture of the electronic component as in the case where a grip hand having fingers is used. On the other hand, it may be rotated and held by suction.

Conventionally, in order to detect the degree of rotation of the electronic component with respect to the suction nozzle, the suction nozzle is rotated while irradiating the electronic component with light. When the shadow of the electronic component irradiated on the light receiving element is the shortest, it is determined that the electronic component is in the predetermined posture.

However, in such a rotation posture detection method, it takes time to detect the rotation posture, and it is difficult to mount electronic components quickly, and it is difficult to improve the mounting efficiency.

An object of the present invention is to enable the posture of an electronic component held by a suction nozzle of a mounting head to be quickly detected.

[0007] The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0008]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows.

That is, the electronic component mounting apparatus of the present invention comprises:
An electronic component mounting apparatus for mounting an electronic component housed in a component supply unit on a mounted member, the mounting head being movable horizontally in a direction between above the component supply unit and above the mounted member, A suction nozzle attached to a tip of a vertically movable shaft provided to be vertically movable on the mounting head, for sucking and holding the electronic component, and disposed on the mounting head at a distance from a central axis of the suction nozzle; A light-receiving element having a light-receiving surface along a direction perpendicular to the central axis, and a lens that irradiates light from a light source toward the light-receiving element through the electronic component sucked and held at the tip of the suction nozzle,
A light source group having a plurality of light sources arranged in a direction perpendicular to the optical axis of the lens and arranged in parallel with the light receiving surface and irradiating light to the lens, and a plurality of light sources in the light source group are sequentially arranged. Detecting means for detecting a rotation angle of the electronic component based on a size of a shade of the electronic component which is turned on and irradiated on the light receiving element.

According to the present invention, a plurality of light sources in a light source group are sequentially turned on while scanning in a predetermined order, and among the light from the light sources irradiated on the light receiving element, the electronic component held by the suction nozzle If the electronic component is held by the suction nozzle in a rotated state, the rotation angle can be detected by detecting the size of the part shielded by. By turning on to scan multiple light sources,
The attitude of the electronic component in the rotational direction can be quickly detected.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view showing an entire electronic component mounting apparatus 10 also called a chip mounter, and FIG.
3 is an enlarged sectional view taken along line 2-2 in FIG. 1, FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG. 1, and FIG.
FIG. 4 is a view taken along the line 4-4 in FIG.

The electronic component mounting apparatus 10 has an apparatus main body 11 having two columns 11a and 11b extending vertically and a horizontal beam 11c connected to the upper ends thereof. Column portions 11a, 11b and horizontal beam portion 11c
Are formed by attaching a cover to the outside of a skeleton formed of a mold steel material.
A through-hole 12 is formed at the center of 1.

A component support 13 is provided on one side of the apparatus body 11.
The component support 13 is provided with a component supply unit 14 as shown in FIG. FIG. 1 shows a component supply unit 14 provided on one side of the component support 13, but the component supply units 14 are provided on both sides of the component support 13 as shown in FIG. ing.

A large number of parts cassettes are loaded in the parts supply section 14. Each part cassette contains electronic parts such as semiconductor chips of ICs and LSIs, capacitors, diodes and resistors. A tape wound in a reel shape while being held is accommodated. The electronic components to be mounted include, besides the components stored in the parts cassette, the components stored in the stick or the components stored in the tray, and these are mounted on the component support 13. Will be.
The stick is also called a magazine and is a pipe-shaped case with a rectangular cross section, in which electronic components are arranged and accommodated in a straight line, and the tray is used to arrange electronic components in a plane. It is intended to be accommodated.

As shown in FIG. 2, two conveyors 15 are provided above the component support table 13 so as to extend in the X-axis direction. The conveyor 15 mounts a mounting board 15a on which electronic components are mounted. It is designed to be carried in from outside the apparatus main body 11. The two conveyors 15 are mounted on the mounting board 1
According to the size of 5a, the distance between them can be adjusted by moving toward and away from each other in the Y-axis direction. However, in FIG. 1, the conveyor 15 is omitted.

In order to mount the electronic components housed in the parts cassette at a predetermined position on the mounting board 15a, two mounting heads 16 are movably provided in two horizontal directions, ie, an X-axis direction and a Y-axis direction. 11 is attached.

In order to move the mounting head 16 in the horizontal direction, two guide rails 17 extending in the Y-axis direction are attached to the horizontal beam 11c.
The movable beam 18 is slidably mounted on the guide rail 17 at a portion of a sliding block 17a provided on the base end side thereof so as to be slidable in the Y-axis direction along the line 7. Have been. Two guide rails 19 are attached to each of the movable beams 18 so as to extend in the X-axis direction, and the mounting head 1 is movable along the guide rails 19 in the X-axis direction.
6 is mounted.

As shown in FIG. 2, two moving beams 18 each having a mounting head 16 are mounted on the apparatus main body 11, but in FIG. Only the rail 19 is shown. However, a component mounting apparatus having one mounting head 16 with one moving beam 18 may be used. As shown, the guide rail 19 is attached to the lower part of the cantilever type movable beam 18, extends from the tip of the movable beam 18 to below the horizontal fixed beam 11 c, and is suspended by the guide rail 19. The mounting head 16 that moves horizontally in the state
Is designed to secure a wide moving stroke in the X-axis direction by utilizing the space below the horizontal fixed beam 11c.

As shown in FIG. 4, the mounting head 16 has a holder 21 to which a sliding block 19a that slides along each guide rail 19 is fixed. Make up. FIG. 5 is a perspective view showing a schematic structure of the mounting head 16, and FIG. 6 is an enlarged view of the mounting head 16 shown in FIG.

As shown in FIG. 5, the holder 21 has two connecting portions 21a mounted on the guide rail 19, two vertical portions 21b extending vertically from the respective connecting portions 21a, and these vertical portions 21b. Horizontal part 21 connecting
c. A bearing block 22 is attached to the outside of the lower end of each vertical portion 21b. Four hollow shafts 23 are attached to each bearing block 22 so as to be slidable in the axial direction and rotatable. ing. Therefore, a total of eight hollow shafts 23 are attached to one mounting head 16 as shown by reference numerals 23a to 23h in FIG. A work holder 24 is attached to the tip of each hollow shaft 23, and the electronic component E is held by the work holder 24.

A support member 27 is fixed to the connecting portion 21a of the holder 21, and a screw shaft 28 is rotatably mounted between the support member 27 and the horizontal portion 21c as shown in FIG. . An up / down moving plate 29 is screwed to the screw shaft 28 at a female screw portion 29a, and the up / down moving plate 2 is driven by rotating the screw shaft 28.
9 is driven in the vertical direction. In order to guide the vertically moving plate 29, as shown in FIG.
The guide rod 30 fixed to the moving plate 7
Are fitted in the through holes formed in the holes.

In order to rotate the screw shaft 28, as shown in FIG. 7, a motor 31 is fixed to the holder 21 and a timing pulley 32 fixed to the shaft of the motor 31.
And a timing pulley 33 fixed to the screw shaft 28, a timing belt 34 is stretched. Therefore, when the motor 31 is driven, the vertically movable plate 29 is vertically driven by the screw shaft 28.

As shown in FIG. 8, eight pneumatic cylinders 35 are attached to the vertically movable plate 29 so as to correspond to the eight work holders 24. As shown in FIG. 6, each of the pneumatic cylinders 35 is attached to the vertically moving plate 29 by screwing a male screw formed on the outer peripheral surface of the cylinder to a female screw formed on the vertically moving plate 29. A drive lever 37 is fixed to the tip of the piston rod 36 of the pneumatic cylinder 35, and each drive lever 37 protrudes outside the vertical portion 21b through a slit formed in the vertical portion 21b.

The hollow shaft 23 penetrates through a through hole formed at the end of each drive lever 37, and the large diameter portion 38 of the hollow shaft 23 contacts the drive lever 37 as shown in FIG. A compression coil spring 42 is mounted between the drive lever 37 and a stopper 41 fixed to the hollow shaft 23. A downward spring force is applied to the hollow shaft 23 by the compression coil spring 42.

On one vertical portion 21b of the holder 21,
As shown in FIG. 9, four solenoid valves 43 for controlling the supply and the stop of the supply of the compressed air, respectively, are attached.
The air supply port of each solenoid valve 43 is connected via a hose.
It is connected to four pneumatic cylinders 35 corresponding to the four hollow shafts 23e to 23h. The other vertical part 21
A similar electromagnetic valve 43 is attached to b, and is connected to four pneumatic cylinders 35 corresponding to the four hollow shafts 23a to 23d via hoses. Therefore,
When compressed air is supplied into the pneumatic cylinder 35, the piston rod 36 moves forward and downward, and the drive lever 3
7 is driven downward.

A tension coil spring 44 is mounted between the drive lever 37 and the vertical moving plate 29, and a spring force is applied to each vertical moving plate 29 in an upward direction. Therefore, stop supplying compressed air,
When the inside of the pneumatic cylinder 35 communicates with the exhaust port of the solenoid valve 43, the respective drive levers 37 move upward with respect to the up and down plate 29 by the spring force of the extension coil spring 44.

As shown in FIG. 9, the work holder 24 has a suction nozzle 25 that sucks air from the opening at the tip to vacuum-suck the electronic component E, and a finger that opens and closes by air pressure. Grip hand 26
Both can be attached to the tip of the hollow shaft 23. One of the four hollow shafts 23 shown in FIG.
One shows a state in which the grip hand 26 is mounted on one of the three hollow shafts 23 and the suction nozzle 25 is mounted on the other three hollow shafts 23.

When the electronic component E loaded on the component support 13 is held by the work holder 24, the mounting head 1
After horizontally moving 6 to a predetermined position, the corresponding hollow shaft 23 is moved down, and after holding, the hollow shaft 23 is moved up. After moving the mounting head 16 to a predetermined position on the mounting board 15a, the hollow shaft 23 is moved down again. Accordingly, the electronic component E moves up and down and moves horizontally while being held by the work holder 24. However, if other components and the electronic component E interfere with each other during the horizontal movement, the electronic component E will not work. Since the work holder 24 falls down from the holder 24, the vertical movement stroke of the work holder 24 needs to be set to a length long enough not to cause interference.

In consideration of the improvement of the mounting efficiency of the electronic component E on the mounting board 15a, it is desirable to move the work holder 24 up and down quickly in a short time. In the illustrated electronic component mounting apparatus 10, each hollow shaft 23 is driven by a combined driving of the vertical movement of the vertical movement plate 29 by the motor 31 and the vertical movement by the pneumatic cylinder 35 attached thereto. I am trying to do it.

The advance limit position of the piston rod 36 by the pneumatic cylinder 35 can be positioned with high precision by bringing the piston into contact with the rod cover of the pneumatic cylinder 35, but the piston rod 36 can be positioned with high precision at the intermediate position. Positioning is difficult. On the other hand, the rotation speed of the motor 31 can be controlled with high accuracy, and the vertical movement plate 29 can be positioned and stopped at an arbitrary position. The speed of the forward movement of the piston rod 36 by the pneumatic cylinder 35 can be easily set higher than the vertical movement speed of the vertical movement plate 29 by the motor 31. In addition, the electronic component E at the time when the workpiece holder 24 is moved downward to come into contact with the electronic component E
Can be set so that the driving force by the motor 31 is smaller than the driving force by the pneumatic cylinder 35. Therefore, as shown in FIG.
By moving the work holder 24 up and down in combination with the driving of the pneumatic cylinder 35, the work holder 2
The electronic component E can be mounted on the electronic component E without applying an impact force while performing the quick up-down movement of the electronic component E. Electronic component E
If the height of the electronic component E differs depending on the type of
The lower limit position of the work holder 24 can be arbitrarily adjusted by the rotation speed of the motor 31.

When the work holder 24 mounted on each hollow shaft 23 is a suction nozzle 25, in order to supply a negative pressure, that is, a vacuum to the suction nozzle 25, respective bearing blocks located on the left and right in FIG. A total of eight ejector-type vacuum pumps 45 are provided at 22 corresponding to the respective workpiece holders 24.
The ejector type vacuum pump 45 is a pump in which compressed air is blown to a diffuser to generate a vacuum there, and the generated vacuum is connected between a suction port 46 and a joint 47 at an upper end of the hollow shaft 23. Thus, the suction nozzle 25 at the tip of the work holder 24 is
Can be in a vacuum state.

On the other hand, when the grip hand 26 is attached to the tip of the hollow shaft 23 as the work holder 24, the solenoid valve incorporated in the ejector type vacuum pump 45 is operated to supply compressed air to the hollow shaft 23. do it,
The finger is opened and closed.

In order to detect the position of the mounting head 16 when it is moved, a camera 48 is mounted on the holder 21. When the held electronic component E is mounted at a predetermined position on the mounting board 15a. Means that the reference position is detected by the camera 48. The sucked electronic component E may not be held in the work holder 24 in a predetermined posture, but may be held in a rotated posture.

Therefore, the posture of the electronic component E held by the work holder 24 is detected, and if the posture is deviated from a predetermined posture, it is necessary to adjust it to a predetermined position. Therefore, as shown in FIGS. 9 and 10, a motor 51 is attached to the holder 21. On the other hand, as shown in FIG. 6, a hollow spline shaft 52 is rotatably incorporated in the bearing block 22, and the hollow shaft 23 rotates together with the spline shaft 52, and moves vertically with respect to the spline shaft 52. It is slidable. As shown in FIGS. 9 and 10, a timing pulley 53 is fixed to the spline shaft 52 corresponding to each hollow shaft 23, and a total of eight timing pulleys are fixed to the timing pulley 54 fixed to the shaft of the motor 51. A timing belt 55 is continuously stretched between the first and second belts 53. Therefore, when the motor 51 is driven, each work holder 24 is rotated, and the attitude of the electronic component E sucked and held by the work holder 24 in the rotation direction can be changed. In FIG. 10, reference numeral 56 denotes an idle pulley.

FIG. 11 shows the holder 2 as shown in FIG.
FIG. 4 is a pneumatic circuit diagram showing an internal structure of four ejector-type vacuum pumps 45 provided outside each of two vertical portions 21b. As shown in the figure, between a supply port 61 to which compressed air is supplied and a suction port 46, a vacuum generating solenoid valve 62 and a vacuum breaking solenoid valve 63 are provided. When the switch 62 is turned on, compressed air is blown to the ejector section 64 having the diffuser, and a vacuum is generated in the ejector section 64. As a result, the air in the suction port 46 flows into the ejector section 64 via the filter 65 and the check valve. When the electronic component E is sucked at the tip of the suction nozzle 25, the suction port 46 is in a vacuum state. A negative pressure state results. By detecting the pressure of the suction port 46 by the pressure sensor 66, it is possible to detect whether or not the electronic component E is held by the suction nozzle 25.

When the electronic component E sucked by the suction nozzle 25 is removed, the vacuum breaking electromagnetic valve 63 is turned on to guide the compressed air from the air supply port 61 to the suction port 46. The amount of compressed air supplied to the vacuum breaking electromagnetic valve 63 is controlled by a variable throttle valve 67.
The air discharged from the ejector section 64 is
After being silenced in step 8, it is discharged outside.

When the suction nozzle 25 is used as the work holder 24, the suction port 46 is set in a vacuum state to hold the electronic component E by vacuum suction. On the other hand, when the grip hand 26 is used as the work holder 24, the vacuum breaking electromagnetic valve 62 is turned on and off to supply compressed air to the grip hand 26 without operating the vacuum generating electromagnetic valve 62 shown in FIG. By supplying, the finger provided on the grip hand 26 is opened and closed to hold the electronic component E.

FIG. 12 is a bottom view of the mounting head 16 as viewed from below. Each of the bearing blocks 22 has a posture detecting unit 70 attached thereto. FIG. 13 is an enlarged bottom view showing a portion corresponding to one hollow shaft 23 in the posture detection unit 70, and FIG. 14A is a cross-sectional view taken along line 14A-14A in FIG. FIG. 14B is a sectional view taken along 14B-14B in FIG.

As shown in FIG. 14 (A), when the center axis of the suction nozzle 25 is O, the support plate 70a attached to the bearing block 22 is separated from the center axis O, and A line sensor having a light receiving surface 71 extending in a right angle direction is mounted as a light receiving element 71a. The light receiving element 71a has a prism 7 for changing the optical path.
The suction nozzle 25 is attached to the prism 72.
A prism 73 for changing the optical path is attached at a position opposed to the prism 73.

A collimator lens 74 is attached to the support plate 70a via a fixing member 75 adjacent to the prism 73, and a light source group 76 is provided above the lens 74. FIG. 15A is a schematic diagram showing a state in which the optical path of FIG. 14A is developed. The light source group 76 is in a direction perpendicular to the optical axis P ₁ of the lens 74 and is parallel to the light receiving surface 71. It has a plurality of point light sources 76a to 76h arranged at predetermined intervals along a given direction. Optical axis centers Qa to Qh of light from the respective point light sources 76a to 76h
Θa to θh with respect to the lens optical axis P ₁
The light from each of the point light sources 76a to 76h is set in advance based on the interval between the light sources 6a to 76h.

As shown in FIG. 14B, the suction nozzle 2
A line sensor having a light receiving surface 81 that is separated from the central axis O of the fifth light source 5 and extends in a direction perpendicular to the light receiving surface 71 is attached to the support plate 70a as a light receiving element 81a. A prism 82 is attached to the light receiving element 81a,
A prism 83 for changing the optical path is attached to a position facing the prism 82 via the suction nozzle 25.
As each light receiving element, a photodiode or the like can be used, and as a light source, an LED or the like can be used.

A collimator lens 84 is attached to the support plate 70a via a fixing member 85 adjacent to the prism 83, and a point light source 86 is provided above the lens 84. Figure 15 (B) is a schematic view showing a state in which the optical path developed in FIG. 14 (B), the point light source 86 is disposed on an extension of the optical axis P ₂ of the lens. The light from the point light source 86 is converted into parallel light by the lens 84 and the light receiving element 81.
a.

FIG. 16 shows an electronic component E held by the suction nozzle 25 based on signals from the light receiving elements 71a and 81a.
FIG. 3 is a block diagram showing a detection circuit for detecting the posture of the camera. A central processing unit (CPU) and a control unit 91 having a memory such as a ROM or a RAM have respective light receiving elements 71.
a, 81a. Then, from the control unit 91, point light sources 76a to 76h, 8
An operation signal is sent to the motor 6 and the electric motor 51.

Each point light source 76 in the light source group 76
While scanning a to 76h in a predetermined order, power is supplied from the control unit 91 to light up. Each point light source 76a-7
When the light from 6h is applied to the light receiving element 71a via the electronic component E, the light receiving element 71a is in a state where the lengths of the portions shielded by the electronic component E are different depending on the point light source to be turned on. Light is irradiated. That is, the light receiving element 71a
The light is irradiated to the portion not shielded by the electronic component E, and the light is not irradiated to the shielded portion.

Therefore, a lighting signal is sent from the control unit 91 to each of the point light sources 76a to 76h at a predetermined timing, and a signal of the size of the shadow of the electronic component E corresponding to the point light source is sent from the light receiving element 71a to the control unit 91. Sent to The signal corresponding to the size of the shadow is stored in the RAM by the control unit 91.
After turning on all the point light sources 76a to 76h, the CPU calculates the size of each shade based on the arithmetic expression stored in the ROM. Thus, the angle at which the width of the shadow is the shortest is calculated, and the rotation angle of the electronic component E can be detected.

FIG. 17 is a diagram showing the size of the shadow of the electronic component E detected by the light receiving element 71a when the respective point light sources of the light source group 76 are sequentially turned on, and the size of the shadow according to the position of the light source. Can be obtained, and the angle of the rotation posture of the electronic component E can be detected from the position.

[0048] As shown in FIG. 15 (A), two sides forming a parallel to each other of the rectangular electronic component E is perpendicular to the optical axis P _1, the other two sides are parallel to the optical axis P ₁ In the case of a proper posture, it is assumed that the angle between the two point light sources 76d and 76e is the angle of the electronic component E. Similarly, if the rotation angle of the electronic component E is within a predetermined range, the rotation angle can be detected at any angle from the size of the shadow corresponding to each point light source. As described above, by rotating the electronic component E by rotating the electronic component E without rotating the electronic component E, the rotational orientation of the electronic component E is reduced to one-tenth of the time required to detect the rotational orientation. Can be detected.

Based on the detected rotation angle, the control unit 9
1 sends a control signal to the motor 51, the hollow shaft 23 is driven to rotate, and the electronic component E is corrected to an appropriate posture.

On the other hand, when the point light source 86 is turned on and the light from the light source is irradiated on the electronic component E, the portion not shielded by the electronic component E is irradiated on the light receiving element 81a, and the shielded portion emits light. Is not irradiated. Therefore, the center position of the electronic component E can be obtained from the size of the shielded portion. The calculation of the center position is also performed by the CP in the control unit 91.
U can do this.

Next, a procedure for mounting the electronic component E on the mounting board 15a using the above-described electronic component mounting apparatus 10 will be described.

The two mounting heads 16 provided on one electronic component mounting apparatus 10 move the moving beam 18 along the guide rail 17 in the Y-axis direction, respectively, and the guide rail 19 provided on the moving beam 18. By moving the mounting head 16 in the X-axis direction along the axis, the head 16 moves in the horizontal direction. As shown in the figure, when two mounting heads 16 are provided, the respective horizontal movements are controlled so that the mounting heads 16 do not interfere with each other.

Each of the mounting heads 16 is first moved to a predetermined position of the component supply unit 14, and one of the eight work holders 24 provided on the mounting head 16 is positioned at the upper end of the predetermined electronic component E. I do. In this state, the pneumatic cylinder 35 corresponding to the work holder 24 is operated to lower the hollow shaft 23 via the drive lever 37. Then, the motor 31 is driven to move the vertically moving plate 29 downward. Ejector type vacuum pump 4
A control signal is sent at a predetermined timing to a predetermined vacuum generation solenoid valve 62 in the inside 5, compressed air is supplied to the ejector unit 64, and the suction port 46 is in a negative pressure state.

The hollow shaft 2 is formed by the pneumatic cylinder 35.
After moving the hollow shaft 23 downward by the motor 31, the suction nozzle 25
When the tip of the nozzle contacts the electronic component E, the suction nozzle 2
5 can be brought into slow contact with the suction nozzle 25.
Can be prevented from applying an impact force to the electronic component E. The error between the stop position of the tip of the suction nozzle 25 and the surface of the electronic component E is as follows.
It is absorbed by rising against the spring force of No. 2. When the suction nozzle 25 comes into contact with the surface of the electronic component E, the electronic component E is vacuum-sucked to the front end of the suction nozzle 25 by air flowing into the inside from the front end.

As described above, in a state where the electronic component E is sucked at the tip of the suction nozzle 25, the respective light sources 76a to 76h in the light source group 76 are turned on in a predetermined order, so that the rotation direction of the light source can be changed. The posture can be detected, and by turning on the point light source 86, the center position of the electronic component E can be detected. When the electronic component E is in the predetermined posture and is not being sucked and held, the motor 51 is driven to correct the electronic component E to an appropriate posture.

Then, the motor 31 is rotated in the reverse direction to move the vertical moving plate 29 upward, and the compressed air in the pneumatic cylinder 35 is discharged to the outside, so that the driving lever 37 is moved upward by the spring force of the tension coil spring 44. Then, the hollow shaft 23 is moved upward. At the time of this upward movement, the driving of the up-down moving plate 29 and the operation of the pneumatic cylinder 35 may be performed simultaneously. In this manner, the mounting head 16 is moved while the work holder 24 is being moved up or after the up movement is completed.
Is moved in the horizontal direction to stop the mounting head 16 at a predetermined position on the mounting board 15a. At this time, the mounting head 16 is positioned such that the center position of the electronic component E when mounted on the mounting board 15a is positioned at a predetermined position on the mounting board 15a based on the data of the center position of the electronic component E that has been detected. Are controlled in the X-axis direction and the Y-axis direction.

In this state, the electronic component E can be arranged on the mounting board 15a by moving the hollow shaft 23 holding the electronic component E downward in the same manner as described above. The electronic component E sucked and held by the suction nozzle 25 is separated from the suction nozzle 25 by turning on the vacuum breaking solenoid valve 63 shown in FIG.
5a.

Grip hand 2 as work holder 24
When the electronic component E is used, the electronic component E can be grasped and held by turning on and off the vacuum breaking electromagnetic valve 63 at a predetermined timing and supplying compressed air to the grip hand 26. The throttle valve 67 is adjusted when the amount of compressed air supplied to the suction port 46 is changed between when the grip hand 26 is operated and when the vacuum is broken.

Although the invention made by the inventor has been specifically described based on the embodiment, the invention is not limited to the above-described embodiment, and can be variously modified without departing from the gist of the invention. Needless to say, there is.

For example, the electronic component mounting apparatus of the present invention
In the case shown, a plurality of types of electronic components E are mounted on the mounting board 1.
Although the present invention is applied for mounting on the 5a, the present invention may be applied to a case where a specific electronic component is mounted on a test board as a mounted member. In addition, although eight hollow shafts 23 are provided in one mounting head 16, the number is not limited to eight and can be set to any number. Further, in the case shown in the drawing, the work holder 24 is attached to the lower end of the hollow shaft 23 as a vertically moving shaft, and a fluid for operating the work holder 24 is guided by using a hole in the hollow shaft 23. However, the fluid may be supplied directly to the work holder 24 attached to the lower end of the shaft by a hose or the like without making the shaft hollow.

[0061]

Advantageous effects obtained by typical ones of the inventions disclosed in the present application will be briefly described.
It is as follows.

(1) A plurality of light sources provided in the light source group are sequentially turned on to detect the size of the shadow of the electronic component held at the tip of the suction nozzle, thereby detecting the rotational attitude of the electronic component. Therefore, the posture can be quickly detected.

(2) As a result, the mounting efficiency of electronic components can be dramatically improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an entire electronic component mounting apparatus.

FIG. 2 is a sectional view taken along line 2-2 in FIG.

FIG. 3 is a sectional view taken along line 3-3 in FIG.

FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a perspective view showing the mounting head shown in FIGS. 3 and 4;

FIG. 6 is an enlarged sectional view of a main part in FIG.

FIG. 7 is a sectional view taken along line 7-7 in FIG. 6;

8 is a sectional view taken along line 8-8 in FIG.

FIG. 9 is a sectional view taken along line 9-9 in FIG. 6;

FIG. 10 is a sectional view taken along line 10-10 in FIG. 9;

FIG. 11 is a pneumatic circuit diagram showing an internal structure of an ejector type vacuum pump.

FIG. 12 is a bottom view showing the lower surface of the mounting head.

FIG. 13 is an enlarged bottom view showing a part of FIG. 12;

14A is a sectional view taken along line 14A-14A in FIG. 13, and FIG. 14B is a sectional view taken along line 14B-1 in FIG.
It is sectional drawing which follows 4B line.

15A is a developed view of the optical path shown in FIG. 14A, and FIG. 15B is a developed view of the optical path shown in FIG. 14B.

FIG. 16 is a block diagram illustrating a posture detection circuit.

FIG. 17 is a graph showing a concept of detecting a rotation posture of an electronic component.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Electronic component mounting apparatus 11 Device main body 12 Through hole 13 Component support stand 14 Component supply part 15 Conveyor 15a Mounting board (member to be mounted) 16 Mounting head 17 Guide rail 17a Sliding block 18 Moving beam 19 Guide rail 19a Sliding block Reference Signs List 21 Holder 22 Bearing block 23 Hollow shaft (vertical moving shaft) 24 Work holder 25 Suction nozzle 26 Grip hand 27 Support member 28 Screw shaft 29 Vertical moving plate 30 Guide rod 31 Motor 32, 33 Timing pulley 34 Timing belt 35 Pneumatic cylinder 36 Piston 37 Drive lever 38 Large diameter portion 41 Stopper 42 Compression coil spring 43 Solenoid valve 44 Tension coil spring 45 Ejector type vacuum pump 46 Suction port 47 Joint section 48 Camera 51 Data 52 spline shaft 53, 54 timing pulley 55 timing belt 56 idle pulley 61 electric motor 62 vacuum generating solenoid valve 63 vacuum breaking solenoid valve 64 ejector unit 65 filter 66 pressure sensor 67 variable throttle valve 68 muffler 71 light receiving surface 71a light receiving Element (first light receiving element) 72, 73 prism 74 lens 76 light source group 76a to 76h point light source 81 light receiving surface 81a light receiving element (first light receiving element) 82, 83 prism 84 lens 86 light source 86a to 76h point light source 91 controller ( Detecting means, angle detecting means, center detecting means)

Claims (2)

[Claims] 1. An electronic component mounting apparatus for mounting an electronic component housed in a component supply unit on a member to be mounted, wherein the electronic component mounting device is horizontally movable between above the component supply unit and above the member to be mounted. A mounting head, a suction nozzle mounted on a tip of a vertically moving shaft movably provided on the mounting head, and sucking and holding the electronic component; and a mounting head separated from a center axis of the suction nozzle. And a light-receiving element having a light-receiving surface along a direction perpendicular to the central axis. The light from the light source is directed toward the light-receiving element through the electronic component sucked and held at the tip of the suction nozzle. A lens to irradiate, a light source group having a plurality of light sources arranged in a direction perpendicular to the optical axis of the lens and arranged in parallel with the light receiving surface and respectively irradiating light to the lens, Oak Detecting means for sequentially turning on a plurality of light sources, and detecting a rotation angle of the electronic component based on a size of a shadow of the electronic component irradiated on the light receiving element. 2. An electronic component mounting apparatus for mounting an electronic component housed in a component supply unit on a member to be mounted, wherein the electronic component mounting device is horizontally movable between above the component supply unit and above the member to be mounted. A mounting head, a suction nozzle mounted on a tip of a vertically moving shaft movably provided on the mounting head, and sucking and holding the electronic component; and a mounting head separated from a center axis of the suction nozzle. A first light receiving element having a light receiving surface along a direction perpendicular to the central axis, and a light source directed to the first light receiving element via the electronic component sucked and held at a tip of the suction nozzle. A first lens for irradiating light from the first lens, and a plurality of light sources arranged in a direction perpendicular to the optical axis of the first lens and arranged in parallel with the light receiving surface to respectively irradiate the lens with light. Light source group, A second light receiving element disposed on the mounting head at a distance from a central axis of the suction nozzle and having a light receiving surface in a direction perpendicular to a light receiving surface of the first light receiving element; A second lens that emits light from a light source toward the second light receiving element via the electronic component; a light source that emits light to the second light receiving element via the second lens; Are sequentially turned on, and the first light source is turned on.
Angle detecting means for detecting a rotation angle of the electronic component based on a size of a shadow of the electronic component irradiated on a light receiving element; and a shadow of the electronic component irradiated on the second light receiving element by turning on the light source. And a center detecting unit for detecting a center position of the electronic component based on the electronic component mounting apparatus.