JP2000349719A - Optical communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an optical communication device that attains 2-way proper optical communication between a circuit at a fixed body side and a circuit at a rotating body side. SOLUTION: In the optical communication device to make 2-way communication between a circuit at a fixed body 90 side and a circuit at a rotating body 83 side by using at least a couple of forward/reverse photocouplers 87a, 87b interposed between the fixed body 90 and the rotating body 83, the one photocoupler 87a has a roting side light receiving element 105 placed on an axial line S of the rotating body 83 and a fixed side light emitting element 101 that is placed at a position deviated from the axial line S, provided on the fixed body 90 and whose optical axis L is directed toward the rotating side light receiving element 105, and the other photocoupler 87b has a fixed side light receiving element 102 placed on an axial line S of the rotating body 83, provided to the fixed body 90 and a fixed side light emitting element 104 that is placed at a position deviated from the axial line S of the rotating body 83 and whose optical axis L is directed toward the fixed side light receiving element 102.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, an electronic component mounting apparatus (high-speed mounter) for transmitting a control signal between a circuit on a rotary table on a rotating side and a circuit on a host computer on a fixed side. The present invention relates to an optical communication device for performing two-way communication.

[0002]

2. Description of the Related Art As this type of optical communication device, for example, a device mounted on a high-speed mounter described in Japanese Patent Application Laid-Open No. H8-83998 is known. In this high-speed mounter, the motor driver on the rotary table side, which is the rotating side, and the circuit on the host computer side, which is the fixed side, are connected by an optical coupler composed of a pair of light receiving and emitting elements. Control signals are input / output (optical communication) between the host computer and the motor driver. In this case, the optical coupler is constituted by one light receiving and emitting element fixed to the end face of the rotating shaft and the other light receiving and emitting element fixed to the end face of the machine base, facing each other on the axis of the rotating shaft of the rotary table. Have been.

[0003]

As described above, in the conventional optical communication device, a pair of light receiving / emitting elements serving both as a light receiving element and a light emitting element is used. It becomes difficult to completely separate and receive light from the light emitting element (light emitting part) facing the element (light emitting part). Therefore, there is a problem that a modulation circuit and a demodulation circuit are required to correct this, and the apparatus becomes expensive.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical communication device which enables appropriate two-way optical communication by reliably separating light between a circuit on a fixed body side and a circuit on a rotating body side. I have.

[0005]

An optical communication apparatus according to the present invention comprises:
An optical communication device for performing bidirectional communication between a circuit on the fixed body side and a circuit on the rotating body side by at least a pair of optical couplers in the forward and reverse directions interposed between the fixed body and the rotating body,
One optical coupler has a rotation-side light-receiving element provided on the axis of the rotating body, and a fixed-side light-emitting element provided on the fixed body at a position deviated from the axis and having the optical axis directed to the rotation-side light-receiving element. The other optical coupler has a fixed light receiving element provided on the fixed body on the axis and a rotating light emitting element provided at a position deviated from the axis of the rotating body and having the optical axis directed to the fixed light receiving element. It is characterized by the following.

According to this configuration, in one optical coupler, the optical signal emitted from the fixed side light emitting element is received by the rotating side light receiving element, and
The optical signal emitted from the rotation side light emitting element is received by the fixed side light receiving element. In this case, the optical axis of the fixed side light emitting element is
It is suitable for the rotation side light receiving element provided on the axis of the rotating body,
Even if the rotation side light receiving element rotates according to the rotation of the rotating body, the optical signal from the fixed side light emitting element does not deviate from the rotation side light receiving element, and is reliably received by this. Similarly, the optical axis of the rotation side light emitting element is on the axis of the rotating body and faces the fixed side light receiving element provided on the fixed body. The optical signal from the side light emitting element is not deviated from the fixed side light receiving element, but is reliably received. In addition, since the rotation-side light-emitting element is provided at a position off the axis of the rotating body, the rotation-side light-emitting element and the rotation-side light-receiving element provided on the axis of the rotation body may interfere with each other in position. There is no. Similarly, since the fixed side light emitting element is provided at a position off the axis of the rotating body, the fixed side light emitting element and the fixed side light receiving element provided on the axis of the fixed body interfere with each other in position. Nothing.

In another optical communication apparatus according to the present invention, a pair of optical couplers in at least forward and reverse directions interposed between a fixed body and a rotating body allows bidirectional communication between a circuit on the fixed body side and a circuit on the rotating body side. In an optical communication device for performing communication, one optical coupler is provided with a rotating light receiving element provided on the axis of the rotating body, a fixed half mirror provided on the axis and provided on the fixed body, and provided on the fixed body. A fixed-side light-emitting element whose optical axis is directed to the rotation-side light-receiving element via the fixed-side half mirror; and the other optical coupler is a fixed-side light-receiving element that is on the axis and provided on the fixed body; A rotating half mirror provided on the rotating body, and a rotating light emitting element provided on the rotating body and having an optical axis directed to the fixed light receiving element via the rotating half mirror.

According to this configuration, in one of the optical couplers, the optical signal projected from the fixed side light emitting element is reflected by the fixed side half mirror and received by the rotating side light receiving element.
In the other optical coupler, an optical signal emitted from the rotation side light emitting element is reflected by the rotation side half mirror and received by the fixed side light receiving element. In this case, the optical axis of the fixed light emitting element is bent by the fixed half mirror and faces the rotating light receiving element provided on the axis of the rotating body, and the rotating light receiving element rotates according to the rotation of the rotating body. Even so, the optical signal from the fixed-side light emitting element does not deviate from the rotating-side light receiving element, and is reliably received by this. Similarly, the optical axis of the rotation-side light-emitting element is bent by the rotation-side half mirror, and faces the fixed-side light-receiving element provided on the fixed body on the axis of the rotation body. Even if the light emitting element rotates, the optical signal from the rotating light emitting element does not deviate from the fixed light receiving element and is reliably received by the light signal. Further, since the rotation side light emitting element can be provided at a position deviated from the axis of the rotating body by the rotation side half mirror, the rotation side light emitting element and the rotation side light receiving element provided on the axis of the rotating body are located at different positions. Does not interfere with each other. Similarly, since the fixed side light emitting element can be provided at a position off the axis of the rotating body by the fixed side half mirror, the fixed side light emitting element and the fixed side light receiving element provided on the axis of the fixed body are located at different positions. Does not interfere with each other.

In another optical communication apparatus according to the present invention, a pair of optical couplers in at least forward and reverse directions interposed between a fixed body and a rotating body allows bidirectional communication between a circuit on the fixed body side and a circuit on the rotating body side. In an optical communication device for performing communication, one optical coupler has a light emitting element provided on one of a rotating body and a fixed body and a light receiving element provided on the other, on the axis of the rotating body, and the other. Is characterized by having an annular light emitting element provided on one of the rotating body and the fixed body and an annular light receiving element provided on the other, on a concentric circle with the rotating body.

According to this configuration, in one optical coupler, the optical signal emitted from the light emitting element is received by the light receiving element, and in the other optical coupler, the optical signal emitted from the annular light emitting element is emitted. Is received by the annular light receiving element.
In this case, the light emitting element and the light receiving element are both provided on the axis of the rotating body and face each other, and even if any of them rotates according to the rotation of the rotating body, the optical signal from the light emitting element deviates from the light receiving element And the light is reliably received. Similarly, both the annular light emitting element and the annular light receiving element are provided concentrically with the rotating body and face each other, and even if either of them rotates according to the rotation of the rotating body, the optical signal from the annular light emitting element is annular. The light is reliably received without being deviated from the light receiving element. In addition, the light emitting element and the annular light receiving element can be provided so as not to interfere with each other, and the light receiving element and the annular light emitting element can be provided so as not to interfere with each other.

In this case, the annular light emitting element comprises an annular light diffusing member and a light emitting diode disposed on the back side of the light diffusing member, and the annular light receiving element comprises an annular light diffusing member and the back side of the light diffusing member. And a phototransistor disposed at the same time.

According to this configuration, even when a light emitting diode having a small light emitting portion and a phototransistor having a small light receiving portion are used, an optical signal emitted from the light emitting diode can be reliably received by the photo transistor. Note that a plurality of light emitting diodes and phototransistors may be provided at equal intervals in the circumferential direction of each light diffusing member.
preferable.

In these cases, it is preferable that annular light-shielding members are provided between the light-emitting element and the annular light-receiving element, and between the light-receiving element and the annular light-emitting element.

According to this structure, the light blocking member can prevent the optical signal emitted from the light emitting element from being received by the adjacent annular light receiving element, and can prevent the optical signal emitted from the annular light emitting element from being received. Can be prevented from being received by the adjacent light receiving element.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electronic component mounting apparatus (high-speed mounter) equipped with an optical communication apparatus according to an embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a side view of the electronic component mounting apparatus, and FIG. 2 is a plan view thereof. As shown in FIGS. 1 and 2, the electronic component mounting apparatus 1 includes a supply system 3 for supplying an electronic component A and a mounting system 4 for mounting the electronic component A on a board B in parallel with each other with the apparatus main body 2 interposed therebetween. Is arranged.

The apparatus main body 2 includes an index unit 11 serving as a main body of a drive system, a rotary table 12 connected thereto, and a plurality (12) of mounting heads 13 mounted on an outer peripheral portion of the rotary table 12. The rotary table 12 is intermittently rotated by the index unit 11 at an intermittent pitch corresponding to the number of the mounting heads 13. When the rotary table 12 rotates intermittently, the suction nozzles 14 mounted on each mounting head 13 face the supply system 3 and the mounting system 4 as appropriate, and after sucking the electronic component A supplied from the supply system 3, rotate to the mounting system 4. This is mounted on the substrate B transported and introduced into the mounting system 4.

The supply system 3 includes an electronic component A mounted on the board B.
The tape cassette 21 is detachably mounted side by side on a supply table 23 slidably guided by a pair of guide rails 22, 22. A ball screw 24 is screwed into the supply table 23 in the sliding direction.
The forward / reverse rotation of the feed motor 25 connected to one end of the ball screw 24 advances and retreats, and the desired tape cassette 21 is selectively brought to the suction position of the mounting head 13. In each tape cassette 21, a carrier tape C loaded with electronic components A at a predetermined pitch is mounted in a state wound around a tape reel 26, and the electronic components A are unwound from the tape reel 26. It is sucked from the carrier tape C by the suction nozzle 14 at any time.

The mounting system 4 includes an XY table 31 for moving the mounted substrate B in the X-axis direction and the Y-axis direction, a carry-in transport path 32 and a carry-out transport path 33 disposed before and after the XY table 31, A substrate B on the transport path 32 is transferred to the XY table 31, and a substrate transfer device 34 that simultaneously transfers the substrate B on the XY table 31 to the unloading transport path 33. Substrate B sent to the downstream end of carry-in conveyance path 32
Is transferred onto the XY table 31 by the substrate transfer device 34, and at the same time, the substrate B on the XY table 31 on which the mounting of the electronic component A is completed is transferred to the unloading conveyance path 33 by the substrate transfer device 34. The board B introduced on the XY table 31 is appropriately moved by the XY table 31, and corresponding to the electronic components A sent one after another by the respective mounting heads 13, the component mounting portion faces the mounting position. Electronic components A are received from each suction nozzle 14.

The apparatus main body 2 has an index unit 11 serving as a main body of a drive system on a support base 15. The index unit 11 rotates the rotary table 12 intermittently and synchronizes with the intermittent cycle of the rotary table 12. (Linked), and various devices of the device main body 2 are operated.

The rotary table 12 is fixed to a vertical shaft 16 hanging from the index unit 11, and rotates intermittently clockwise in a plan view. On the outer periphery of the turntable 12,
Twelve mounting heads 13 are attached via a bracket 17 at equal intervals in the circumferential direction so as to be vertically movable. In this case, the intermittent rotation of the rotary table 12 is performed by the mounting head 1.
In accordance with the number 3, each intermittent rotation has a 12 intermittent cycle, and each mounting head 13 revolves by this intermittent rotation.
Stops at twelve stop positions (work stations). The twelve stop positions include a suction position for sucking the electronic component A and a mounting position for mounting the electronic component A,
The position includes the position at which the picked-up electronic component A is imaged and the position is corrected, the position at which the mounting head 13 performs nozzle switching (replacement), and the like.

On the other hand, each mounting head 13 has a plurality of (about five) suction nozzles 14 arranged at equal intervals in the circumferential direction so as to be able to protrude and retract, respectively. A stepping motor for revolving the suction nozzle 14 around the axis is incorporated. Further, the mounting head 13 facing the suction position or the mounting position is located at the position.
And an elevating mechanism for elevating and lowering the mounting head 13 by engaging with the head. As will be described later in detail, various motors 41 including these stepping motors are driven by a motor driver 42 disposed above the index unit 11 and are supplied from a power supply circuit (not shown) to these driving sources. The supply of power and the input and output of control signals from a host computer 43, which will be described later, are performed via a slip ring unit 44 provided above the index unit 11. That is, the power supply circuit and the host computer 43 constitute a fixed-side circuit, and the motor driver 42 constitutes a movable-side circuit.

As shown in FIG. 3, the slip ring unit 44 includes a lower slip ring portion 51, an upper detection / communication portion 52, and a casing 53 covering these components. The casing 53 includes an upper casing 53a having a lid and a cylindrical lower casing 53b. The upper casing 53a houses the detection / communication unit 52, and the lower casing 53b houses the slip ring unit 51. ing.

The slip ring portion 51 has a rotating conductor 61 whose lower end is located coaxially with the rotary table 12 and is connected to a main shaft 54 thereof, and a plurality of brush bodies 62 slidably contacting the rotating conductor 61. . The upper end of the rotating conductor 61 extends to the detection / communication unit 52, and the upper and lower support members 64, 64 are provided at upper and lower locations via bearings 63, 63.
Is rotatably supported. On the outer peripheral surface of the rotating conductor 61, a plurality of electrodes 65 with which the brush bodies 62 are in sliding contact are formed. Each electrode 65 is connected to the various motors 41 through the inside of the rotating conductor 61. Secondary power cable 66 is connected.

A lower casing 53b is attached between the upper and lower support members 64, 64, and includes a rotating conductor 61 and a plurality of brush bodies 62. The base of each brush body 62 is fixed to the inner peripheral surface of the lower casing 53b, and the leading end thereof is in sliding contact with the outer peripheral surface (electrode 65) of the rotating conductor 61. A primary power cable 67 is connected to the base of each brush body 62 through the lower casing 53b.
Driving power for various motors 41 supplied from a power supply circuit (not shown) is supplied to the various motors 41 via the primary power cable 67, the brush body 62, the rotating conductor 61, and the secondary power cable 66. .

Next, before describing the detection / communication section 52,
A control system related to this will be described.

FIG. 4 is a block diagram of a control system relating to the slip ring unit 44. As shown in FIG. 4, the control system includes a host computer 43 for controlling the whole of the electronic component mounting apparatus 1 and a slip ring unit. 44
, A motor and a motor driver 42 for driving the motors 41, various motors (motor (1), motor (2),...) Including the above-described stepping motors. Host computer 4
3 is a CPU 71 and R for storing various control programs.
OM72 and R serving as a work area for various data processing
AM 73 and an input / output control circuit (IOC) 74,
They are connected by an internal bus 75. In IOC74,
A circuit for supplementing the function of the CPU 71 and for handling interface signals with each part of the electronic component mounting apparatus 1 is incorporated. For this reason, here, in particular, it is connected to the detection / communication unit 52, and controls the input / output with the detection / communication unit 52 in conjunction with the CPU 71. With the above configuration, the CPU 71 processes various data in the RAM 73 in accordance with the control program in the ROM 72 and controls each unit of the electronic component mounting apparatus 1 via the IOC 74.

As shown in FIGS. 3 and 4, the detection / communication unit 52 includes an optical communication unit (optical communication device) 81 for inputting / outputting a control signal to / from the host computer 43, and a turntable 12 Rotation detection unit 82 for detecting the rotation position of the motor
And The rotation detecting unit 82 includes a slit disk 83 fixed to the upper end surface of the rotating conductor 61 and a plurality of photo interrupters 84 facing the peripheral edge of the slit disk 83. Each photo interrupter 84 Each is connected to the host computer 43 via the detection line 85. In this case, the rotation angle of the rotary table 12 can be detected by, for example, forming a large number of slits on the slit disk 83 at equal intervals and detecting the slits with a photo interrupter (one or more) 84. (Rotary encoder). In addition, by disposing a plurality of slits or a plurality of photo interrupters 84 at unequal intervals, for example,
It is also possible to detect whether or not is stopped.

On the other hand, an optical communication unit 81, which is an optical communication device,
Bidirectional coupler 8 composed of a pair of optical couplers 87a and 87b
7 and a photoelectric conversion circuit 76. The pair of optical couplers 87a and 87b are interposed between the slit disk 83 and a circuit board (photoelectric conversion circuit 76) 90 suspended inside the upper casing 53a in a state where they are inverted. The slit disk 83 also serves as a circuit board. The two primary control lines 91 connected to the host computer 43 are connected to a bidirectional coupler 87 via a circuit board 90, respectively, and the two secondary control lines 92 connected to each motor driver 42 , Are connected to a bidirectional coupler 87 via a slit disk 83, respectively.

Thus, a control signal from the host computer 43 is input to the motor driver 42 in the form of optical communication by one of the optical couplers 87a. Each motor driver 42 has a one-chip microcomputer (M
/ C) 77 is incorporated, and a control processing start signal and the like from the M / C 77 are output to the host computer 42 via the other optical coupler 87b.

Here, referring to FIG.
7 will be described. As shown in the figure, on the lower surface of the upper circuit board (fixed body) 90, the fixed light emitting element 1 is provided.
01 and the fixed-side light receiving element 102
It is attached so that it is molded with. Similarly, a rotating light emitting element 104 and a rotating light receiving element 105 are mounted on the upper surface of a slit disk (rotating body) 83 so as to be molded with a translucent resin 103. Of the bidirectional coupler 87, the host computer 43
The output optical coupler 87a on the output side is composed of the fixed side light emitting element 101 and the rotation side light receiving element 105, and the input optical coupler 87b on the input side is connected to the rotation side light emitting element 104 and the fixed side. And a light receiving element 102.

In this case, the light receiving elements 102 and 105 on the fixed side and the rotating side are arranged on the axis S of the slit disk 83 so as to face each other. Further, the fixed side light emitting element 101 is connected to the axis S and the fixed side light receiving element 10.
2, the optical axis L is inclined.
Faces the center of the rotation-side light receiving element 105. Therefore, the optical signal emitted from the fixed light emitting element 101 reaches the rotation light receiving element 105 at a predetermined angle with respect to the axis S, and is received by the rotation light receiving element 105. Similarly, the rotation-side light-emitting element 104 is disposed at a position deviated from the axis S and the rotation-side light-receiving element 105, and the optical axis L faces the center of the fixed-side light-receiving element 105.
Also in this case, the optical signal emitted from the rotating light emitting element 104 reaches the fixed light receiving element 102 at a predetermined angle with respect to the axis S, and is received by the fixed light receiving element 102.

In such a configuration, the fixed side light emitting element 10
Since the first optical axis L is directed to the center of the rotation-side light receiving element 105, even if the rotation-side light-receiving element 105 rotates together with the slit disk 83, the optical signal from the fixed-side light-emitting element 101 does not rotate. There is no deviation from. Similarly, even if the optical axis L of the rotation side light emitting element 104 is oriented toward the center of the fixed side light receiving element 102 and the rotation side light emitting element 104 rotates together with the slit disc 83, the optical signal from the rotation side light emitting element 104 Does not deviate from the fixed-side light receiving element 102. Therefore, bidirectional optical communication is possible regardless of whether the slit disk 83 is stopped or rotating.

By tilting the optical axis L with respect to the axis S, the fixed light emitting element 101 and the fixed light receiving element 102
Do not interfere with each other, and the rotation side light emitting element 104 and the rotation side light receiving element 105 do not interfere with each other. Further, since the bidirectional coupler 87 is housed in the upper casing 53a, each of the light receiving / emitting elements 101, 102, 104, 10
5 can also prevent physical communication failure due to the attachment of dust or the like. In addition, it is preferable to use a light emitting diode (LED) or a laser diode as the fixed-side and movable-side light-emitting elements 101 and 104, and a phototransistor or a photodiode as the fixed-side and movable-side light-receiving elements 102 and 105. Preferably, it is used.

Next, the configuration of a bidirectional coupler 87 according to the second embodiment will be described with reference to FIG. As shown in the figure, on the lower surface of the upper circuit board (fixed body) 90,
The fixed-side light emitting element 111 and the fixed-side light receiving element 112 are mounted so as to be molded with a translucent resin 114. A fixed half mirror 113 is formed on the slope of the resin 114 by vapor deposition of a metal film or the like. Similarly, a rotating light emitting element 115 and a rotating light receiving element 116 are mounted on the upper surface of the slit disk (rotating body) 83 so as to be molded with a translucent resin 114. A rotating half mirror 117 is formed on the slope. In this case, the output optical coupler 87a is composed of a fixed side light emitting element 111, a rotating side light receiving element 116, and a fixed side half mirror 113, and the input optical coupler 87b is a rotating side light emitting element 115, a fixed side light receiving element 112 and a rotating side light emitting element. And a side half mirror 117. In FIG. 6, the half mirrors 113 and 117 are used.
Is embedded in the resin, but it is not always necessary to embed the resin, and the resin may be exposed.

Both the fixed and rotating light receiving elements 112,
Reference numerals 116 are arranged on the axis S of the slit disk 83 in a state of facing each other. Also, the fixed-side light emitting element 11
1 is disposed laterally at a position deviated from the fixed-side light receiving element 112, and its optical axis L is
It is bent at 13 and faces the rotation-side light receiving element 116. Therefore, the optical signal emitted from the fixed light emitting element 111 is reflected by the fixed half mirror 113, reaches the rotating light receiving element 116, and is received by the rotating light receiving element 116.
Similarly, the rotation side light emitting element 115 is
6, the optical axis L
Are bent by the rotation side half mirror 117 and face the center of the fixed side light receiving element 112. Also in this case, the optical signal emitted from the rotation side light emitting element 115 is reflected by the rotation side half mirror 117, reaches the fixed side light receiving element 112, and is received by the fixed side light receiving element 112.

In such a configuration, since the optical axis L of the fixed light emitting element 111 is directed to the rotating light receiving element 116 via the fixed half mirror 113, the rotating light receiving element 116 rotates together with the slit disk 83. Even so, the optical signal from the fixed side light emitting element 111 does not deviate from the rotating side light receiving element 116. Similarly, the optical axis L of the rotation side light emitting element 115 is fixed via the rotation side half mirror 117 to the fixed side light receiving element 1.
12, the optical signal from the rotation side light emitting element 115 does not deviate from the fixed side light receiving element 112 even if the rotation side light emitting element 115 rotates together with the slit disk 83.
Therefore, bidirectional optical communication is possible regardless of whether the slit disk 83 is stopped or rotating. Also, both half mirrors 113, 117
Is used, the fixed light emitting element 111 and the fixed light receiving element 112 do not interfere with each other, and the rotating light emitting element 115 and the rotating light receiving element 116 do not interfere with each other. It should be noted that both the fixed and rotating light emitting elements 111, 1
15 is disposed on the axis S, and both the fixed-side and rotation-side light receiving elements 112, 116 are connected to the respective light emitting elements 111, 1
It may be arranged laterally at a position deviated from 15.

Next, the configuration of a bidirectional coupler 87 according to the third embodiment will be described with reference to FIG. As shown in the figure, on the lower surface of the upper circuit board (fixed body) 90,
The fixed-side light-emitting element 121, the fixed-side light-shielding plate 122, and the fixed-side light-receiving element 123 are arranged concentrically. Similarly, on the upper surface of the slit disk (rotating body) 83, the rotation-side light receiving element 124, the rotation-side light shielding plate 125, and the rotation-side light-emitting element 1
26 are arranged concentrically. In this case, the output optical coupler 87a is connected to the fixed-side light emitting element 121
And the rotation-side light receiving element 126, and the input optical coupler 8
7b is composed of a rotating light emitting element 124 and a fixed light receiving element 123 which are arranged to face each other.

In this case, the fixed side light emitting element 121 and the rotating side light receiving element 126 are disposed on the axis S of the slit disk 83. The fixed-side light receiving element 123 includes a light diffusion member 127 formed in an annular shape and three phototransistors 128 disposed on the back side of the light diffusion member 127. Member 1
27 are arranged at equal intervals in the circumferential direction. Similarly,
The rotation-side light emitting element 124 includes a light diffusion member 129 formed in an annular shape, and three light emitting diodes 130 disposed on the back surface side of the light diffusion member 129. The members 129 are arranged at equal intervals in the circumferential direction. The fixed-side light-shielding plate 122 is formed in an annular shape, is located between the fixed-side light-emitting element 121 and the fixed-side light-receiving element 123, and is vertically provided on the lower surface of the circuit board 90. Similarly, the rotation-side light shielding plate 125 is formed in an annular shape, and is located between the rotation-side light-receiving element 124 and the rotation-side light-emitting element 126.
It is provided upright on the upper surface of the slit disk 83.

Fixed side light emitting element 121 and rotating side light receiving element 1
The light signal emitted from the fixed light emitting element 121 extends straight to the rotation light receiving element 126, and is received by the rotation light receiving element 126. Similarly, the rotation-side light-emitting element 124 and the fixed-side light-receiving element 123 face each other at the same position, and an optical signal synchronously emitted from the three light-emitting diodes 130 is circularly diffused by the light diffusion member 129. As a result, the light reaches a fixed light receiving element 123 as an annular light. In the fixed-side light receiving element 123,
This ring-shaped light is received by the light diffusing member 127 and is further received simultaneously by the three phototransistors 128. On the other hand, the optical signal emitted from the fixed side light emitting element 121 is not blocked by the fixed side light shielding plate 122 and received by the fixed side light receiving element 123.
The optical signal projected from the light-receiving element 24 is not blocked by the rotation-side light-shielding plate 125 and received by the rotation-side light receiving element 126.

In such a configuration, the fixed side light emitting element 12
1 and the rotation-side light-receiving element 126 face each other, so that even if the rotation-side light-receiving element 126 rotates together with the slit disk 83, the optical signal from the fixed-side light-emitting element 121 may deviate from the rotation-side light-receiving element 126. Absent. Similarly, since the annular rotating side light emitting element 124 and the annular fixed side light receiving element 123 face each other, even if the rotating side light emitting element 124 rotates together with the slit disc 83, the light from the rotating side light emitting element 124 The signal does not deviate from the fixed-side light receiving element 123. The light emitting element 121 and the light receiving element 1 on the circuit board 90 side
23 and the light receiving element 126 and the light emitting element 124 on the slit disk 83 side may be replaced.

In this embodiment, the case where the optical communication device (optical communication unit) is applied to the control system of a high-speed mounter has been described. However, the optical communication device of the present invention is not limited to such a mounter, but may be various types. It is needless to say that the present invention can be applied to bidirectional optical communication between the fixed body side and the rotating body side of the device.

[0042]

As described above, according to the optical communication device of the present invention, even if the rotating light emitting element and the rotating light receiving element rotate in accordance with the rotation of the rotating body, the light signals from the respective light emitting elements face each other. The light can be reliably received without being deviated from the element. Therefore, appropriate and reliable two-way optical communication can be performed between the circuit on the fixed body side and the circuit on the rotating body side.

[Brief description of the drawings]

FIG. 1 is a side view of an electronic component mounting device equipped with an optical communication device according to an embodiment of the present invention.

FIG. 2 is a plan view of the electronic component mounting apparatus according to the embodiment.

FIG. 3 is a longitudinal sectional view of the slip ring unit of the embodiment.

FIG. 4 is a block diagram illustrating a control system of a part of the electronic component mounting apparatus according to the embodiment.

FIG. 5 is a configuration diagram of an optical communication unit (optical communication device) according to the embodiment.

FIG. 6 is a configuration diagram of an optical communication unit (optical communication device) according to a second embodiment.

FIG. 7 is a configuration diagram of an optical communication unit (optical communication device) according to a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electronic component mounting apparatus 2 Mounting main body 12 Rotary table 42 Motor driver 43 Host computer 71 CPU 76 Photoelectric conversion circuit 77 Microcomputer 81 Optical communication unit 83 Slit disk 87 Bidirectional coupler 87a Output optical coupler 87b Input optical coupler 90 Circuit board 101 , 111, 121 Fixed-side light-emitting element 102, 112, 123 Fixed-side light-receiving element 104, 115, 124 Rotation-side light-emitting element 105, 116, 126 Rotation-side light-receiving element 113 Fixed-side half mirror 117 Rotation-side half mirror 122 Fixed-side light shielding plate 125 Rotation side light shielding plate 127, 129 Light diffusion member 128 Phototransistor 130 Light emitting diode S Axis L Optical axis

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Ikuo Takemura 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. FF24 FF29 FG10 5K002 AA07 BA12 BA21 DA04 FA04 GA08

Claims (5)

[Claims] 1. A light for performing bidirectional communication between a circuit on the fixed body side and a circuit on the rotating body side by at least a pair of optical couplers in the forward and reverse directions interposed between the fixed body and the rotating body. In the communication device, the one optical coupler includes a rotation-side light receiving element provided on an axis of the rotating body, and an optical axis provided on the fixed body at a position deviated from the axis and provided on the rotation-side light receiving element. A fixed-side light-emitting element, and the other optical coupler is provided on the axis and a fixed-side light-receiving element provided on the fixed body, and an optical axis provided at a position off the axis of the rotating body. And a rotating light emitting element directed to the fixed light receiving element. 2. A light for performing bidirectional communication between a circuit on the fixed body side and a circuit on the rotator side by at least a pair of optical couplers in the forward and reverse directions interposed between the fixed body and the rotator. In the communication device, the one optical coupler is provided on a rotation-side light receiving element provided on an axis of the rotating body, a fixed half mirror on the axis and provided on the fixed body, and provided on the fixed body. A fixed-side light-emitting element having an optical axis directed to the rotation-side light-receiving element via the fixed-side half mirror; and the other optical coupler is a fixed-side light-receiving element provided on the fixed body on the axis. A rotating half mirror provided on the rotating body on the axis, and a rotating light emitting element provided on the rotating body and having an optical axis directed to the fixed light receiving element via the rotating half mirror. Optical communication device characterized by having . 3. A light for performing bidirectional communication between a circuit on the fixed body side and a circuit on the rotating body side by at least a pair of optical couplers in the forward and reverse directions interposed between the fixed body and the rotating body. In the communication device, the one optical coupler is on an axis of the rotator,
A light-emitting element provided on one of the rotating body and the fixed body, and a light-receiving element provided on the other; and the other optical coupler, wherein the rotating body and the fixed body are concentric with the rotating body. An optical communication device, comprising: an annular light-emitting element provided on one of them; and an annular light-receiving element provided on the other. 4. The annular light emitting element includes an annular light diffusing member and a light emitting diode disposed on the back side of the light diffusing member, and the annular light receiving element includes an annular light diffusing member and the light diffusing member. 4. The optical communication device according to claim 3, comprising a phototransistor disposed on the back side of the optical communication device. 5. An annular light shielding member is interposed between the light emitting element and the annular light receiving element and between the light receiving element and the annular light emitting element. The optical communication device according to 3 or 4.