JP3350425B2 - Measurement and correction device for electronic component insertion hole position - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component automatic insertion device for automatically mounting electronic components on a printed circuit board.
Detects the position of the insertion hole provided in the printed circuit board for inserting the lead wire of the electronic component, and automatically corrects the relative position of the lead wire and the insertion hole of the electronic component. Related to the device.

[0002]

2. Description of the Related Art Conventionally, Japanese Unexamined Patent Application Publication No.
In -27200, a light-emitting element for placing a printed circuit board on an XY table and irradiating light, and a detector for receiving light transmitted through the insertion hole, define the insertion hole position of the printed circuit board as a distance from a reference point. There has been proposed an automatic coordinate correcting apparatus for measuring and automatically correcting the pitch feed interval of the XY table according to an error during the measurement. Also, Japanese Patent Application Laid-Open
In Japanese Patent No.-114521, a light beam is incident on a lead wire hole, and the light beam transmitted through the hole is received by four optical fibers, and the light receiving element outputs an electric signal proportional to the amount of incident light through the optical fibers. An output electrical signal is received by the control circuit to drive the XY table to align the hole in the printed circuit board with the insertion axis. Japanese Patent Application Laid-Open No. 61-51505 discloses a light projecting portion, a light receiving portion composed of a four-division light receiving element for receiving a light beam projected from the light projecting portion, and a through hole for passing the light beam along a path along the light beam. The printed circuit board having the above is disposed so as to be movable with respect to the light beam, and the output data of the light receiving section is compared with the reference data, and the printed circuit board is moved so that the through hole (hole for inserting an electronic component) becomes the center position of the light beam. Correcting is disclosed.

[0003]

In the above conventional proposals and disclosures, for example, Japanese Patent Application Laid-Open No. 60-27200 uses an image sensor as a detector for receiving light transmitted through an insertion hole. In Japanese Patent Application Laid-Open No. 61-51505, a light beam transmitted through a hole is received by four optical fibers, and a light receiving element outputs an electric signal proportional to the amount of incident light through the optical fibers. Relatively complicated and expensive equipment is required as a means for detecting light transmitted through the hole, which has a light receiving section composed of four divided light receiving elements for receiving the projected light beam.

The main object of the present invention is to reduce the cost by utilizing the function originally provided as a component of the electronic component automatic insertion device and using a simple device as a means for detecting the light transmitted through the hole. The next goal in realizing is:
The compactness of the detection means and the reduction in the number of connection lines between the detection means and the control circuit simplify the cable routing, and the use of simple equipment as the detection means improves reliability. It is another object of the present invention to provide a low-cost, compact and highly reliable electronic component insertion hole position measurement and correction device.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, an insertion hole of a printed circuit board is positioned at an insertion position stored in a computer, and a lead wire of an electronic component is inserted. in automatic electronic part insertion apparatus for inserting, in the measurement position spaced said insertion position and a predetermined distance
And means for projecting a vertical light beam to the plane of the printed circuit board, and means for receiving the light beam at the opposite side of the surface, prior to the beginning of the insertion hole of the printed circuit board
Positioned in the measurement position stored in the serial computer, before
Detected by means of the light beam transmitted through the serial insertion hole is the photodetection
So as to be, first parallel to the printed circuit board to the surface
Moves in a linear direction, the light beam is on both sides of the stop detection means for said received interrupted reaches the edge of the insertion hole
Memorize the position in said computer and calculate the intermediate position in the first direction
The light beam determines the intermediate position in the first direction.
In a second straight line direction orthogonal to the straight line direction.
The light beam is moved to the edge of the insertion hole by moving the printed circuit board.
The light receiving means is not detected
Memorizing the position in said computer and calculating the intermediate position in the second direction
A detection position where the center of the insertion hole is obtained by calculation and
The computer may calculate the corrected insertion position at the predetermined distance from the detection position by performing a reverse operation, and position the insertion hole at the corrected insertion position instead of the insertion position stored in the computer. It is a characteristic measurement and correction device for electronic component insertion hole positions.

According to a second aspect of the present invention, the light projecting hand
The step is a light emitting element and a light emitting side optical fiber for guiding light of the light emitting element.
A light-emitting side optical fiber.
The light is projected from the edge of the Iva onto the surface of the printed circuit board.
The means for receiving light includes a light receiving element and the light receiving element.
Has a light receiving side optical fiber that guides light and passes through the insertion hole
The received light from the end of the optical fiber on the light receiving side to the light receiving element.
A device for measuring and correcting the position of an electronic component insertion hole according to claim 1, which is directed to a device.

[0007]

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram of a main part of the measurement correction device for detecting the position of the electronic component insertion hole, FIG. 2 is a diagram illustrating a procedure of measuring the position of the electronic component insertion hole by the measurement correction device, and FIG. FIG. 4 is a plan view showing an example of an electronic component automatic insertion device embodying the present invention, and FIG. 4 is a side view showing the electronic component automatic insertion device of FIG. 3 from the right side.

3 and 4 showing an example of an electronic component automatic insertion device embodying the present invention. The electronic component automatic insertion device 1 is disclosed in Japanese Patent Publication No. Hei 3-58979. And an endless belt mechanism for intermittent running operation in which a chain 3 is stretched between sprockets 2A to 2D.
Pallets 4 are fixed at equal intervals on the upper side. This endless belt mechanism runs in a horizontal plane, and each pallet 4 has an electronic component chain 7 obtained by cutting an electronic component chain 7 in which electronic components with lead wires are arranged in a holding band so as to have one electronic component. The cut piece is held horizontally.

A supply unit 5 is arranged at equal intervals along the straight running portion of the chain 3, that is, the outside of the straight running portion of the pallet 4, at the pallet 4. A series of electronic components 7 drawn from 6 is set. In this case, the packages 6 are also arranged at the same interval as the supply unit 5, and the electronic component series 7 extracted from the package 6 is extracted to the supply unit 5 as it is.

The electronic component automatic insertion device 1 includes a chuck 10 for holding a lead wire of an electronic component of a continuously cut piece of electronic component transferred by a pallet 4, a rotary disk 11 provided with the chucks 10 at equal intervals, and a chuck 11. And an insertion guide 13 for inserting a lead wire of the electronic component carried by 10 into a printed circuit board 17 on an XY table 12. Delivery of the continuous cut pieces of electronic components from the pallet 4 to the chuck 10 is performed at a delivery position P along the sprocket 2C in FIG.

As shown in FIG. 4, the turntable 11 is rotatably supported on an axis about an axis inclined at 45 degrees with respect to the horizontal. The chuck 10 has an inclination of 45 degrees with respect to the axis. The rotary disk 11 is provided on the rotary disk 11 on the same conical surface, that is, the chuck 10 is in a posture in which the longitudinal direction is vertical at the delivery position P, and the rotary disk 11 rotates intermittently in synchronization with the intermittent running operation of the chain 3. When the chuck 10 reaches the position corresponding to the insertion guide 13 by the rotation of the chuck 11, the longitudinal direction becomes a horizontal posture.
The chuck 10 holding the lead wire of the electronic component by the intermittent rotation of the turntable 11 reaches the position corresponding to the insertion guide 13 by holding the electronic component from the pallet 4 while holding the lead wire in the horizontal position. , Chuck 10
The lead wire of the electronic component held by the chuck 10 is vertically oriented in the axial direction at a position corresponding to the insertion guide 13. When the chuck 10 is horizontally pushed out toward the insertion guide 13, the insertion guide 13 becomes a lead wire of the electronic component. To the XY table 12
The electronic component is received in a vertical posture toward the upper printed circuit board 17. Thereafter, the chuck 10 releases the holding of the lead wire of the electronic component and returns from the state of being pushed out horizontally.

A chuck 1 holding a lead wire of an electronic component
0 reaches the position corresponding to the insertion guide 13
It has at least one stop position due to the intermittent rotation of the turntable 11, at which one of the stop positions the cutting of the backing portion of the electronic component continuous cutting piece is performed, and the insertion guide 13
The electronic parts sent while processing the lead wires and the like to the insertion position by the XY table 12 fixed to the frame 14 are controlled by the motors 15 and 16 in the X-axis direction and the Y-axis direction by motors 15 and 16 by a control circuit receiving a command signal from the computer. Move,
Printed circuit board 1 mounted and fixed on XY table 12
Insertion guide 1 that positions the insertion hole 18 at the insertion position
3 moves down while holding the electronic component, and inserts a lead wire into the insertion hole 18 of the printed circuit board 17. The lead wire inserted into the insertion hole 18 of the printed circuit board 17 is fixed by a cutting and bending mechanism (not shown) as necessary,
Reference numeral 3 releases the holding of the electronic component, and moves upward to return to the original position.

A description will be given of an explanatory diagram of a main part for detecting the position of an electronic component insertion hole of the measuring and correcting apparatus shown in FIG. 1. A printed board 17 is mounted and fixed on the XY table 12, but in the explanatory diagram, Only the substrate 17 is shown. Therefore, when the XY table 12 moves in the X-axis direction and Y-axis direction, the printed circuit board 17 also moves in the X-axis direction and Y-axis direction. In the illustration, only the XY direction is shown. Although a plurality of insertion holes 18 are shown, only one is shown in the illustration.
, Ie, the light emitting element 23
The printed board 1 guides the light emitted by the optical fiber 21 and projects the light perpendicularly from the end portion 25 to the surface of the printed board 17.
The end 26 of the optical fiber 22 is arranged perpendicular to the plane of the end 7 and concentric with the end 25 and on the opposite side to the plane of the printed circuit board 17. Light transmitted through the insertion hole 18 reaches the end 26 and the optical fiber 22 is It is a configuration that leads to reach the light receiving element 24,
The light emitting element 23 and the light receiving element 24 may be individually or housed in the same case 27. The light emitting element 23 and the light receiving element 24 may be fixed to the frame 14 or the like at a position where the movement of the XY table 12 is not hindered. , End 25 and end 2
An axis perpendicular to the surface of the printed circuit board 17 concentrically connecting the optical fiber 21 is held at a measurement position separated from the insertion position of the insertion guide 13 by a predetermined distance Xs, Ys. For example, the insertion guide is on the end 25 side of the optical fiber 21. 13 is fixed to the frame 19 of the insertion mechanism having the optical fiber 22, and the end 26 side of the optical fiber 22 is fixed and arranged on a stationary portion of the XY table 12 fixed to the frame 14. Terminals 23A and 23 of the light emitting element 23 and the light receiving element 24, which are arranged and fixed so as to avoid a movable range such as 12
B and the terminals 24A and 24B are connected to a detection circuit via a connection line. The detection circuit sends a signal indicating the presence or absence of detection to the computer of the electronic component insertion device 1.

FIG. 2 is a view for explaining the procedure in which the measurement and correction device measures the position of the electronic component insertion hole.
FIG. 4 is a plan view showing the insertion hole 18 from a direction perpendicular to the surface of FIG.
The position of the space where the end portion 25 of the optical fiber 21 and the end portion 26 of the optical fiber 22 are extended and overlapped is indicated by a black circle as the end portion 25. The black circle is the end portion 25 seen from the end portion 26,
The diameter of the insertion hole 18 is 0.4 to 1.5 mm, which is also the position of the light beam from which the light projected from the end 25 reaches the end 26.
The diameter of the light beam indicated by a black circle is, for example, 0.1 mm.
The procedure for measuring the positional relationship of the light beam indicated by the symbol “〜” indicates a plurality of states.

FIG. 2 shows a control circuit in which an XY table 12 receives a command signal from a computer. The XY table 12 is moved in the X and Y directions by motors 15 and 16, and is mounted on the XY table 12 and fixed. 17 insertion holes 1
8 is located at a measurement position separated by a predetermined distance Xs, Ys from the insertion position, and a light beam indicated by the end 25 exists in the insertion hole 18 within a range of an estimated error.
Power is supplied from the detection circuit to the terminals 23A and 23B via the connection lines, and the light emitting element 23 emits light. The light emitted by the light emitting element 23 is guided by the optical fiber 21 and the end 2
5 reaches the end 26, is guided by the optical fiber 22, reaches the light receiving element 24, and receives the terminal 24A,
The detection circuit operates from 24B via a connection line, and the detection circuit sends a detection signal to the computer.

The following is a state in which the printed circuit board 17 is moved to the right in the X-axis direction. The light beam indicated by the end 25 moves in the direction of arrow A relative to the insertion hole 18. Indicates that the light beam at the position 25 'was completely blocked by the printed circuit board 17 in the state of
The position of the XY table 12 for moving the printed board 17 to the right in the X-axis direction is known by a computer, and when the light beam reaches the edge of the insertion hole 18 and begins to be interrupted, the amount of light reaching the end 26 decreases. Therefore, the light amount guided to the optical fiber 22 and reaching the light receiving element 24 decreases. When the light amount falls short of a predetermined amount, the detection circuit operates via the connection lines from the terminals 24A and 24B, and the detection circuit is transmitted to the computer. The position of the XY table 12 in the X-axis direction at this time when the signal indicating the detection is no longer sent is stored in the computer as X1.

Subsequently, a state in which the printed board 17 is moved to the left in the X-axis direction is shown. The light beam indicated by the end 25 moves in the direction of arrow B relatively to the insertion hole 18. Indicates that the light beam at the position 25 ′ once passes through the insertion hole 18 and increases in the amount of light reaching the light receiving element 24, and then is again blocked by the printed circuit board 17.
When the light beam reaches the right edge of the insertion hole 18 and starts to be interrupted again, the amount of light reaching the end 26 decreases, so that the amount of light guided to the optical fiber 22 and reaching the light receiving element 24 decreases. The light beam once passes through the insertion hole 18 and the detection circuit sends a detection signal to the computer.
Eventually, when the light quantity falls below the predetermined light amount, the detection circuit does not send a signal indicating that detection has been performed to the computer.
The position in the X-axis direction of the Y table 12 is stored in the computer as X2.

The intermediate position between X1 and X2 stored in the computer is calculated by the computer. Upon receiving a command signal from the computer, the control circuit operates to operate the XY table 12
The light beam indicated by the end portion 25 is moved relative to the insertion hole 18 in the direction of the arrow C, indicating that the printed circuit board 17 has been moved to an intermediate position between X1 and X2 in the X-axis direction. In the state, the light beam at the position 25 'is completely transmitted through the insertion hole 18 in the state.
The light beam is guided from the end 26 to the optical fiber 22 and reaches the light receiving element 24, and the detection circuit sends a signal indicating detection to the computer.

The end portion 25 shows a state in which the printed circuit board 17 has been moved downward in FIG. 2 in the Y-axis direction.
The light beam indicated by moves in the direction of arrow D relative to the insertion hole 18, and indicates that the light beam at the position 25 'was completely blocked by the printed circuit board 17 in the state shown in FIG. The position of the XY table 12 for moving the printed board 17 in the Y-axis direction is known by a computer, and when the light beam reaches the edge of the insertion hole 18 and begins to be interrupted, the amount of light reaching the end 26 decreases. Therefore, the amount of light guided to the optical fiber 22 and reaching the light receiving element 24 decreases.
The detection circuit operates from 4B via a connection line, and the detection circuit does not send a signal indicating that detection has been performed to the computer. At this time, the position of the XY table 12 in the Y-axis direction is set to Y.
1 is stored in the computer.

The end portion 25 shows a state in which the printed board 17 has been moved upward in FIG. 2 in the Y-axis direction.
The light beam indicated by moves relative to the insertion hole 18 in the direction of arrow E. In the state of the light beam, the light beam at the position 25 'once passes through the insertion hole 18 and reaches the light receiving element 24 when the amount of light reaches When the light beam reaches the lower edge in FIG. 2 of the insertion hole 18 and starts to be blocked again, indicating that the light beam has been blocked by the printed circuit board 17 again, the amount of light reaching the end 26 decreases. The amount of light that is guided by the optical fiber 22 and reaches the light receiving element 24 decreases. Therefore, the light beam once passes through the insertion hole 18 and a detection signal is sent from the detection circuit to the computer, but eventually falls below the predetermined amount. Then, the detection circuit does not send a signal indicating that the detection has been performed to the computer. The Y-axis position of the XY table 12 at this time is stored in the computer as Y2.

The intermediate position between Y1 and Y2 stored in the computer is calculated by the computer. Upon receiving a command signal from the computer, the control circuit operates to operate the XY table 12.
The light beam indicated by the end 25 is in the direction indicated by the arrow F relative to the insertion hole 18 in a state in which the printed circuit board 17 has been moved to an intermediate position between Y1 and Y2 in the Y-axis direction. In the state, the light beam at the position 25 'is completely transmitted through the insertion hole 18 in the state.
The light beam is guided from the end 26 to the optical fiber 22 and reaches the light receiving element 24, and the detection circuit sends a signal indicating detection to the computer.

The state is the result of the state
By following the procedure described in the above, the state where the light beam indicated by the end portion 25 exists at the center of the insertion hole 18 is X.
The position of the Y table 12 in the X-axis direction and the Y-axis direction is the detection position obtained by the measurement. First, the computer sets the insertion hole 18 of the printed board 17 fixed on the XY table 12 to the insertion position. Has been described as being located at a measurement position separated by a distance Xs, Ys. The measurement position is a predetermined distance X at an insertion position stored in advance in a computer.
The insertion position obtained by calculating the position separated by s and Ys is a program stored in a computer in advance, and X
The position of the insertion hole 18 on the printed board 17 or the printed board 17
If the positional accuracy of being mounted and fixed on the Y table 12 is obtained, no mistake occurs even if the lead wire of the electronic component held by the insertion guide 13 is inserted. The position accuracy of the position of the insertion hole 18 and the position at which the printed circuit board 17 is placed and fixed on the XY table 12 at 17 is not always obtained. The initial measurement position is obtained by following the procedure described in ~. The difference between the detected position and
The computer determines a predetermined distance Xs, Ys from the detection position.
The XY table 12 is moved in the X-axis direction and the Y-axis direction by the motors 15 and 16 by a control circuit which receives a command signal for moving to the correction insertion position from the computer. The insertion hole 18 of the printed circuit board 17 mounted and fixed on the table 12 is positioned at the correction insertion position at a predetermined distance Xs, Ys from the detection position.

Generally, two or three lead wires are provided for one electronic component (some electronic components have more than one lead wire). Therefore, a plurality of insertion holes 18 for one electronic component are provided on the printed circuit board 17. It is known that the measurement time of all the insertion holes 18 corresponding to one electronic component exists in one set, but the time required is long, and that the positional accuracy of the one set of insertion holes 18 is generally not bad. ,
Therefore, if one of a set of insertion holes 18 corresponding to one electronic component is selected to determine the correction insertion position, the required time can be reduced, or the correction insertion position of all the electronic components to be inserted into the printed circuit board 17 can be reduced. In some cases, the printed circuit board 17 and the insertion hole can be sufficiently achieved by obtaining the corrected insertion position of a specific electronic component and performing the same correction for the insertion position of another electronic component without obtaining the same. What is necessary is just to consider and determine conditions such as what kind of positional accuracy the 18 is processed, and what kind of positional accuracy the printed circuit board 17 is fixed on the XY table 12. The XY table 12 is moved with the corrected insertion position thus obtained as a new insertion position, the insertion hole 18 of the printed circuit board 17 fixed on the XY table 12 is positioned at the corrected insertion position, and the insertion guide 13 holds the same. If the lead wire of the electronic component is inserted into the insertion hole 18 of the printed circuit board 17 and fixed by a cutting and bending mechanism as needed, the electronic component can be automatically mounted without causing any mistake.

[0025]

As described above, according to the electronic component insertion hole position measuring and correcting apparatus of the present invention, the insertion hole detector
(Hand that emits a light beam perpendicular to the surface of the printed circuit board
A step and receiving the light beam on the opposite side of the surface
Which comprises means) is a main equipment to be added to the new,
Computer also XY table also control circuits Ru der apparatus includes a original components of the electronic component automatic insertion device.
Therefore, Ru can be performed by preparing a program for measurement correction applied to the detector and a computer. The insertion
The hole detector is much less expensive than, for example, an image sensor, a four-optical fiber detector, or a four-segment light receiving element required by the conventional apparatus. Further, the detector is a single <br/> detector a is but because the shape of the net structure is compact, and a small number of connecting lines leading to the detector or al detection circuit further computer. The detector 20 of the embodiment has a terminal 23
A, 23B and the terminal 24A, connected to the detection circuit through the four connection lines from 24B, further number may turn less if a common ground. In addition, the simple configuration of the detector 20 does not require a delicate operation, so that stable detection can always be performed, and there is a great effect that low-cost, compact and always stable detection can be performed.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a main part of a measurement correction device that detects an electronic component insertion hole position.

FIG. 2 is a diagram illustrating a procedure in which a measurement correction device measures the position of an electronic component insertion hole.

FIG. 3 is a plan view showing an example of an electronic component automatic insertion device embodying the present invention.

FIG. 4 is a side view showing the electronic component automatic insertion device of FIG. 3 from the right side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electronic component automatic insertion apparatus 4 Pallet 5 Supply part 6 Package 7 Electronic component connection 10 Chuck 12 XY table 13 Insertion guide 17 Printed circuit board 18 Insertion hole 20 Detector 21, 22 Optical fiber 23 Light emitting element 23A, 23B Terminal 24 Light receiving element 24A , 24B terminal 25, 26 end

Claims (2)

(57) [Claims] 1. A automatic electronic part insertion apparatus for inserting the leads of the electronic component position the printed circuit board insertion hole at the insertion point stored in a computer, the pre-to the measurement position spaced said insertion position and a predetermined distance means for projecting a light beam perpendicular to the surface of the substrate,
And means for receiving the light beam at the opposite side of the surface, positioned at the measurement position stored in the computer at the beginning of the insertion hole of the printed circuit board, the light beam transmitted through the insertion hole to the light so as to be detected by the unit, the move the printed circuit board in a first linear direction parallel to the surface, the light beam is blocked reach the edge of the insertion hole the <br/> light to means detects The positions on both sides where no longer occurs are stored in the computer, and the intermediate position in the first direction is calculated and obtained.
The recording beam passes through an intermediate position in the first direction,
Moving the printed circuit board in a second linear direction orthogonal to
The light beam reaches the edge of the insertion hole and is blocked.
The positions on both sides where the light receiving means no longer detect
To calculate the intermediate position in the second direction
The detection position where the center of the insertion hole is located
The data is obtained by reversely calculating the corrected insertion position at the predetermined distance from the detection position, and positioning the insertion hole at the corrected insertion position instead of the insertion position stored in the computer. Electronic component insertion hole position measurement and correction device. 2. A light emitting device comprising : a light emitting element;
A light-emitting side optical fiber for guiding light of an optical element;
The light of the element is applied to the pre-
The light receiving means for transmitting light to the light receiving element and the light receiving element.
Light that has passed through the insertion hole
From the end of the optical fiber on the light receiving side to the light receiving element.
The apparatus for measuring and correcting the position of an electronic component insertion hole according to claim 1, which is a spider .