JP6271918B2 - Component mounting head for surface mounter - Google Patents

Description

  The present invention relates to a component holding head for holding a component to be mounted in a surface mounter that mounts a component such as an IC chip on a substrate.

  The surface mounter is configured to pick up and hold a component from a component supply unit, transfer it onto a printed circuit board, and mount it at a predetermined position on the printed circuit board by a component holding head having a holder such as a nozzle. .

  As such a component holding head, there is known a rotary type component holding head in which a rotary head having a plurality of holders is attached to the head body so as to be rotatable around a vertical axis (for example, Patent Document 1).

  In the rotary type component holding head, it is necessary to supply electric power from the head body to the rotary head in order to drive a sensor mounted on the rotary head, an actuator of a holding tool, or the like. As the power supply mechanism, a slip ring mechanism is generally used as can be seen in Patent Document 1 described above. However, since the slip ring mechanism involves rotational contact between the slip ring and the brush, there are problems in durability, unit miniaturization, and the like.

  On the other hand, Patent Document 2 proposes a rotary type component holding head provided with a non-contact type energy data transmission means (see paragraphs 0034 to 0036 and FIG. 1).

  FIG. 6 is a reproduction of the main part of the energy / data transmission means of Patent Document 2. The energy / data transmission means includes an annular first core 100 and a second core 200 for energy (power) transmission, and plate-shaped first antenna 300 and second antenna 400 for data (signal) transmission. Is provided.

  The first core 100 has an inverted U-shaped cross section, and the second core 200 is disposed so as to close the opening end of the first core 100. The first antenna 300 and the second antenna 400 are disposed to face each other in the hollow chamber generated by the inverted U-shaped cross section of the first core 100. The first core 100 and the first antenna 300 are disposed on the head body 500 side, and the second core 200 and the second antenna 400 are disposed on the rotary head 700 side that rotates about the rotation axis 600 with respect to the head body 500. ing. That is, the second core 200 and the second antenna 400 on the rotary head 700 side rotate around the rotation axis 600 with respect to the first core 100 and the first antenna 300 on the head body 500 side. According to Patent Document 2, with such a configuration, energy (electric power) is transmitted from the head main body 500 to the rotary head 700 via the first core 100 and the second core 200 regardless of the rotation of the rotary head 700 with respect to the head main body 500. In addition, the data (signal) can be exchanged bidirectionally between the head body 500 and the rotary head 700 via the first antenna 300 and the second antenna 400.

  Here, Patent Document 2 describes that the direction of the magnetic field used for energy transfer is substantially perpendicular to the direction of the electric field used for data transfer (claims 12 and 12). Paragraph 0018). Referring to FIG. 6, it is clear that the direction of the electric field used for data transmission is the vertical direction in FIG. 6 from the arrangement of the first antenna 300 and the second antenna 400. Therefore, the direction of the magnetic field used for energy transfer is the arrow direction shown in FIG. The coil wound around the first core 100 and the second core 200 is not shown in Patent Document 2, but it is necessary to wind the coil as shown in FIG. 7 in order to obtain the direction of the magnetic field. That is, since the coils 110 and 210 need to be wound in the circumferential direction of the annular first core 100 and the second core 200, a unit body as shown in FIG. It is necessary to form a ring as a whole by arranging them in the circumferential direction, or to form a plurality of through-holes for winding the coils 110 and 210 around the annular first core 100 and second core 200 along the circumferential direction.

  In either case, since the first core 100 and the second core 200 are discontinuous in the circumferential direction, a rotational position (energy) that can efficiently transmit energy when the rotary head 700 (second core 200) rotates. When the first core 100 and the second core 200 are not in the energy transmitting position, there is a problem that the energy transmission efficiency is deteriorated. This is shown in FIG. 8, and when the second core 200 is in the energy transferable position indicated by the solid line, energy can be transmitted efficiently, but when it is at the position indicated by the broken line in the middle, Transmission efficiency deteriorates.

Japanese Patent Laid-Open No. 10-284889 JP-T-2006-515715

  The problem to be solved by the present invention is that in a component holding head of a surface mounter in which a rotary head is attached to a head body so as to be rotatable about a vertical axis, the head body is changed to the rotary head regardless of the rotational position of the rotary head. A non-contact type and stable power can be transmitted continuously and efficiently.

According to one aspect of the present invention, a rotary head is attached to a head body so as to be rotatable about a vertical axis, and a plurality of holding tools for holding components are attached to the rotary head, and the head body and the rotary head are arranged between the head body and the rotary head. A component holding head of a surface mounting machine in which a non-contact transmission device is disposed, wherein the non-contact transmission device includes an annular first core disposed around the vertical axis on the head body side, and the rotary head An annular second core disposed opposite to the first core around the vertical axis on the side, a first coil wound around the vertical axis around the first core, and the vertical axis around the second core A second coil wound around and disposed opposite to the first coil; a third coil wound around the vertical axis around the first core; and wound around the vertical axis around the second core The third coil And a fourth coil disposed opposite the applied power to the first coil and transmitted to the second coil by electromagnetic induction, the third coil and the signal applied to one of the fourth coil Is transmitted to one of the third coil and the fourth coil by electromagnetic induction, each of the first core and the second core has a through hole in the center, and the vertical axis passes through each through hole. The third coil and the fourth coil are disposed on the inner peripheral side of the first coil and the second coil, and are arranged at the peripheral portions of the respective through holes. A surface mounting machine component holding head is provided.

  As described above, the first core and the second core are annularly arranged around the vertical axis, and the first coil and the second coil are wound around the vertical axis so as to face each other. Since it is uniformly generated between the first and second coils (see Fig. 2 to be described later), regardless of the rotary position of the rotary head, the non-contact type and stable power by electromagnetic induction from the head body to the rotary head is continuous and efficient. Can be transmitted.

In the present invention, the vertical axis mounted the first core and by penetrating to be fitted into the through holes respectively provided in the center portion of the second core. Thereby, since the first core and the second core are disposed adjacent to the vertical axis, they can be miniaturized and the magnetic path length can be shortened, so that the power transmission efficiency can be improved.

In the present invention, the non-contact transmission device includes a third coil wound around the vertical axis around the first core and a third coil wound around the vertical axis around the second core. fourth and further example Bei coils arranged to transmit to the other of the third and the third coil and the fourth coil by electromagnetic induction coils and the signal applied to one of the fourth coil Like that . As a result, various signals such as a control signal from the head body side and a sensor signal from the rotary head side can be transmitted to each other without contact. The “signal” in this specification is a concept including data converted into a signal format.

In this case, the third coil and the fourth coil that are responsible for signal transmission are the inner peripheral sides of the first coil and the second coil that are responsible for power transmission, and are the centers of the first core and the second core. It arrange | positions in the peripheral part of the through-hole each provided in the part. Thereby, the magnetic path length of the magnetic field for transmitting signals can be shortened, and the occurrence of mutual interference (crosstalk) with the magnetic field for transmitting power can be suppressed.

  According to the present invention, in a component holding head of a surface mounter in which a rotary head is attached to a head body so as to be rotatable around a vertical axis, the head body is not contacted with the rotary head regardless of the rotational position of the rotary head. Stable power can be transmitted continuously and efficiently.

In addition, since a signal transmission coil is also provided, a signal can be transmitted in a non-contact manner together with electric power.

It is a block diagram which shows notionally the structure of the component holding head which concerns on one Example of this invention. It is sectional drawing which shows notionally the mode of the magnetic field which generate | occur | produces with the non-contact transmission apparatus in the Example of FIG. The shape of a 1st core and a 2nd core is shown, (a) is a top view, (b) is a front view. It is a block diagram of the principal part which shows the modification of the Example of FIG. FIG. 2 is a block diagram illustrating a specific system configuration for transmitting power and signals by a contactless transmission apparatus in the embodiment of FIG. 1. It is explanatory drawing which reproduced the principal part of the energy data transmission means of patent document 2. FIG. It is explanatory drawing which shows the winding direction of the coil in the energy data transmission means of patent document 2. FIG. It is explanatory drawing which reproduced the principal part of the energy data transmission means of patent document 2. FIG.

  Hereinafter, embodiments of the present invention will be described based on examples shown in the drawings.

  FIG. 1 is a configuration diagram conceptually showing the configuration of a component holding head according to an embodiment of the present invention. The component holding head shown in the figure is applied to a surface mounter, and an electronic component is picked up and held from a component supply unit in the surface mounter, transferred onto a printed board, and mounted at a predetermined position on the printed board.

  The component holding head is disposed between the head main body 10 that is fixedly arranged, the rotary head 30 that is rotatably attached to the head main body 10 around the vertical axis 20, and the head main body 10 and the rotary head 30. The contactless transmission device 40 is provided.

  The head main body 10 includes a servo motor 11 that rotates the rotary head 30 and a servo motor 12 that controls the raising and lowering of the nozzles 31 arranged in the rotary head 30. Although omitted in FIG. 1, the head main body 10 also incorporates a main controller that controls the rotation operations of the servo motors 11 and 12 and the rotary head 30.

  The rotary head 30 has a barrel shape whose outer shape is substantially cylindrical, and the vertical shaft 20 passes through the center thereof. The rotation of the servo motor 11 causes the rotary head 30 to rotate in the R direction around the vertical axis 20 with respect to the head body 10. The rotary head 30 is provided with a plurality of nozzles 31 as holders for holding electronic components along the circumferential direction. Each nozzle 31 can be rotated in the T direction around the axis by an actuator (not shown) made of a servo motor or the like built in the rotary head 30, and can be moved in the Z direction along the axis by the servo motor 12. It is attached to.

  The non-contact transmission device 40 includes a first core 41 and a second core 42, a first coil 43 and a second coil 44 as coils for power transmission, and a third coil 45 and a fourth coil as coils for signal transmission. And a coil 46.

  The first core 41 is integrally disposed on the head body 10 side, and the second core 42 is integrally disposed on the rotary head 30 side. As shown in FIG. 3, the first core 41 and the second core 42 have the same shape, and are opposed to each other with a certain gap G so as to be vertically symmetrical.

  Referring to FIG. 3, the first core 41 and the second core 42 are formed in an annular shape (ring shape), and have a through hole 41 a (42 a) at the center thereof. Moreover, it has the annular groove 41b (42b) concentrically with the through-hole 41a (42a), and has the cyclic | annular notch 41c (42c) in the peripheral part of the through-hole 41a (42a). As shown in FIG. 1, the vertical shaft 20 is mounted so as to be fitted through the through holes 41 a and 42 a of the first core 41 and the second core 42. Since the vertical shaft 20 is integrally disposed on the head body 10 side and does not rotate, the vertical shaft 20 is mounted with a slight margin so that it can rotate within the through hole 42a of the second core 42. On the other hand, since the first core 41 is fixed to the head body 10 together with the vertical shaft 20 (rotary head 30), the vertical shaft 20 is fixedly mounted in the through hole 41a of the first core 41.

  The first coil 43 is wound along the annular groove 41 b of the first core 41, and the second coil 44 is wound along the annular groove 42 b of the second core 42. That is, the first coil 43 and the second coil 44 are wound around the vertical axis 20 and are opposed to each other with a certain gap G for power transmission.

  The third coil 45 is wound along the notch 41 c of the first core 41, and the fourth coil 46 is wound along the notch 42 c of the second core 42. That is, the third coil 45 and the fourth coil 46 are wound around the vertical axis 20 and are opposed to each other with a certain gap G for signal transmission.

  In the above configuration, the magnetic field M1 for power transmission is uniformly generated between the first and second coils 43 and 44 around the vertical axis 20, as shown in FIG. In addition, non-contact and stable power can be continuously and efficiently transmitted from the head body 10 to the rotary head 30 by electromagnetic induction.

  Further, as shown in FIG. 2, the magnetic field M2 for signal transmission is also uniformly generated between the third and fourth coils 45 and 46 around the vertical axis 20, so that the head regardless of the rotational position of the rotary head 30. A signal can be transmitted between the main body 10 and the rotary head 30 in a non-contact manner by electromagnetic induction. Particularly in the case of the present embodiment, the third coil 45 and the fourth coil 46 for signal transmission are the inner peripheral sides of the first coil 43 and the second coil 44 for power transmission, more specifically, through holes 41a, As shown in FIG. 1, the magnetic path length of the magnetic field M2 for signal transmission can be shortened, and mutual interference (crosstalk) with the magnetic field M1 for power transmission occurs as shown in FIG. Can be suppressed.

  As shown in FIG. 4, the third coil 45 and the fourth coil 46 for signal transmission can be disposed on the outer peripheral side of the first coil 43 and the second coil 44 for power transmission, In this case, since the magnetic path length of the magnetic field M2 for signal transmission becomes long and the magnetic flux density becomes low, there is a concern about the occurrence of mutual interference (crosstalk) with the magnetic field M1 for power transmission. Further, in order to increase the magnetic flux density of the magnetic field M2, it is necessary to increase the current flowing through the third coil 45 or the fourth coil 46 or increase the number of turns thereof, leading to an increase in size and cost of the device. Occurs. Therefore, the third coil 45 and the fourth coil 46 for signal transmission are preferably arranged on the inner peripheral side of the first coil 43 and the second coil 44 for power transmission as shown in FIG.

  Next, a specific system configuration for transmitting power and signals by the contactless transmission device 40 described above will be described. FIG. 5 is a block diagram showing the system configuration.

  The non-contact transmission device 40 includes a transmission unit 47 and a reception unit 48 for transmitting power and signals. The first core 41, the first coil 43, and the third coil 45 shown in FIG. 1 are connected to the transmission unit 47, and the second core 42, the second coil 44, and the fourth coil 46 are connected to the reception unit 48. The That is, the transmission unit 47 is disposed on the head 10 side, and the reception unit 48 is disposed on the rotary head 30 side.

  First, a system configuration for power transmission will be described. A direct current of DC 48 V is supplied to the transmission unit 47 from the outside, and this is converted into an alternating current of 100 kHz by a high frequency power transmission circuit and applied to the first coil 43. Inductive current is generated in the second coil 44 by electromagnetic induction, which is converted into direct current by the rectifier circuit of the receiving unit 48, and further, DC power of 24V and 5V is generated by two DC-DC converters (DC-DC CONV.). Is converted to Of these, 24V DC power is used to operate the actuators and various sensors that drive the nozzles and the like described above in the rotary head 30, and 5V DC power is supplied to the control circuit of the receiving unit 48 shown in FIG. Used to operate.

  The system configuration for signal transmission is as shown in FIG. 5, and signals can be transmitted from the head body 10 to the rotary head 30 by a known method. In the system configuration for signal transmission shown in FIG. 5, the transmission unit 47 and the reception unit 48 are each provided with a signal transmission / reception circuit, so that signals (data) are mutually transmitted between the head body 10 and the rotary head 30. Can be transmitted. For example, various signals such as a control signal from the head body 10 side and a sensor signal from the rotary head 30 side can be transmitted to each other without contact.

10 Head body 11, 12 Side motor 20 Vertical axis 30 Rotary head 31 Nozzle (holder)
40 non-contact transmission device 41 first core 41a through hole 41b annular groove 41c notch 42 second core 42a through hole 42b annular groove 42c notch 43 first coil 44 second coil 45 third coil 46 fourth coil 47 transmission unit 48 receiving units

Claims (1)

A rotary head is attached to the head main body so as to be rotatable around a vertical axis, a plurality of holders for holding parts are mounted on the rotary head, and a non-contact transmission device is disposed between the head main body and the rotary head. A component holding head for a surface mount machine,
The non-contact transmission device includes an annular first core disposed around the vertical axis on the head body side, and an annular second core disposed opposite to the first core around the vertical axis on the rotary head side. A core, a first coil wound around the vertical axis around the first core, a second coil wound around the vertical axis around the second core and disposed opposite to the first coil , A first coil wound around the vertical axis around the first core; and a fourth coil wound around the vertical axis around the vertical axis and disposed opposite to the third coil . Electric power applied to the coil is transmitted to the second coil by electromagnetic induction, and a signal applied to one of the third coil and the fourth coil is transmitted to the third coil and the fourth coil by electromagnetic induction. Transmit to one of the other,
Each of the first core and the second core has a through hole in the center, and the vertical shaft is mounted so as to be fitted through the through holes,
The third coil and the fourth coil are component holding heads of a surface mounter , which are disposed on the inner peripheral side of the first coil and the second coil and at the peripheral portion of each through hole .