JP2008103461A - Connecting structure of control board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connecting structure of a control board in an electronic oven corresponding to two kinds of connecting method for a manipulating board. <P>SOLUTION: The connecting structure 1 is constituted on the control board with a common connecting part 2 that can be used in common for the two kinds of connecting method. FPC connector connection that may be used when flat feeling of the manipulating board is necessary can be attained with a layout 3 of a first pin-holes. A cable connector connection in the case where a tact switch and an encoder are built in the manipulating board can also be attained with a layout 4 of a second pin-holes. The connecting method respectively includes a common connecting part 2 corresponding to respective connections and therefore a dead space can be eliminated, because unused connecting portions can be reduced. Moreover, it can also make contribution to reduction in size of the control board. Difference of electric characteristic resulting from difference in the connecting method can be eliminated with change-over of dip switches. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a control board connection structure applicable to connect two boards such as a board divided into a control board and an operation board.

  In home appliance products that have a control unit, especially cooking devices, there are cases where it is necessary to adopt an operation unit structure according to the selling price range when designing and producing products for each country in the world. . In addition, it is necessary to realize operation characteristics and display screens corresponding to the language used and the dish menu unique to the region. In order to cope with such production by destination, the controller of the cooking device has a wide variety of specifications corresponding to combinations of these elements.

  In order to cope with such a wide variety of specifications, the control unit of the cooking device includes a control board that performs the main control of the cooking device, and an operation board that performs control related to the user interface that performs operation and operation display by the user. It is the structure separated into. With such a separation configuration, the basic part for realizing a specific heating capacity and heating chamber structure is realized by a common control board, and the operation part structure, operation characteristics and display screen are realized by a dedicated operation board, Streamline design and production.

  That is, according to the control unit configured as described above, when producing a product with individual specifications, by connecting an individual operation board to a control board with a specification unique to the model or common to similar models, While ensuring basic control based on a control board common to all models, individual specifications based on individual operation boards are realized.

  In designing such an operation board, from the requirements of the operation board, requirements such as safety standards of each country, and cost constraints, as a method of connecting the operation board to the control board containing the main part such as a microprocessor, There are two types of connection methods according to the structure of the operation board: a connection method using an FPC connector and a connection method using a cable connector.

  FPC is an abbreviation for Flexible Printed Circuit and is a “flexible circuit board”. In general, a copper foil having a circuit formed by etching or the like is sandwiched between films such as polyimide, and is excellent in flexibility, flexibility, space saving, and functionality. An example of the FPC connector to be connected to the control board is shown in FIG. 9 as a perspective view. In the connection using the FPC connector, a flat substrate is used as the operation substrate, the flexible terminal portion 31 is formed on the extension portion of the substrate, and the flexible terminal portion 31 is inserted into the FPC connector 30. The operation board (flat board) and the control board are connected by inserting the connection pins 32 of the FPC connector 30 (only a part is given a reference numeral) into the FPC connector connection hole formed in the control board (not shown). . By using a flat substrate for the operation substrate, a flat feeling can be obtained in the operation unit. The connection pins 32 of the FPC connector 30 have two rows of six pins 32 of 2.5 mm (1/10 inch) pitch, and the arrangement of the two rows is parallel and corresponds to a half pitch. They are offset from each other by 25 mm (1/20 inch).

  On the other hand, when a tact switch or encoder, which is a discrete component for operation, is incorporated to configure the operation unit, the operation board is a printed circuit board, and is inserted and soldered on a normal circuit board. A cable connector is used for the connection. An example of a cable connector to be connected to the control board and a receptacle for the connector is shown in FIG. As shown in FIG. 10, the cable connector 40 is connected to the end of the cable 42 connected to the operation board, and the connection pin 43 provided in the receptacle 41 is inserted into the receptacle connection hole provided in the control board (not shown). Then, the receptacle 41 is connected to the control board. In this state, by inserting and fitting the cable connector 40 into the receptacle 41, each terminal of the cable 42 is connected to the connection pin 43, and the control board and the operation board are connected. An operation unit provided with an operation board connected using the cable connector 40 is an operation unit having a mechanical operation feeling, such as a rotary dial or a changeover switch. The cable connector 40 has 7 pins and is arranged on a straight line at a pitch of 2.5 mm (1/10 inch).

  As a conventional board connection method, there has been proposed a printed board that is specified for industrial equipment, consumer equipment, and the like to prevent erroneous insertion of components (Patent Document 1). According to this proposal, according to the function of the equipment used, the number of poles of the connector and the insertion position are clearly color-coded by silk printing, and an incorrect insertion such as a jumpersen that plugs an unused connector insertion hole with the used connector. Since the prevention means is provided, it is possible to reliably assemble the printed circuit board according to the device.

  Further, there has been proposed a board shared connector for connecting an old board having a large pitch between terminals and a new board having a small pitch between terminals (Patent Document 2). According to this proposal, the old board has a switch for detecting a detector provided on the new board by distinguishing between the old and new boards and enabling only some of the terminals in the adjacent terminal group. Therefore, if the partner board to be connected is a new board, the signal group of the new board can be electrically connected to the signal group of the old board through the enabled buffer.

  As described above, two types of connection methods can be used to connect the control board containing the main part such as a microprocessor and the operation board used for the operation part, thereby providing two types having different appearance and operability. The operation board is now available. However, since the number of connection pins and the pin arrangement are different between the two connection methods, the control board that can be connected to both types of operation boards is provided with a connection portion in which a connection hole corresponding to each connection is formed on the board. There is a need. Further, it is necessary to provide a wiring from the control unit circuit element such as a microprocessor to the connection hole of the connection portion as a conductor pattern. As described above, the control board has a large exclusive area necessary for connection, and a portion corresponding to a connection method that is not used is a dead space, so that it is difficult to reduce the size of the board.

FIG. 8 is a photograph taken obliquely showing an example of a control board connection structure (connector mounting form) according to the prior art. On the control board 20, an FPC connector (connector CN-A) and peripheral parts, and a harness connector (connector CN-B) and occupied areas of the peripheral parts are provided. Corresponding to the specifications of the control circuit, FPC connection or cable connector connection is adopted, and peripheral components are mounted according to this. Since the connection structure shown in FIG. 8 is used in the FPC connection specification, the FPC connector 30 is mounted on the connection portion 21 on the control board 20. However, since the receptacle connected to the cable connector is not connected, the connecting portion 22 for mounting the receptacle is idle. On the contrary, in the case of the cable connector connection, the connection portion 21 used for mounting the FPC connector 11 becomes idle. As described above, since the conventional control board is configured to mount two types of connectors at different positions, even if one of the connectors is used for connection, the exclusive area for the unused connector is idle. Therefore, an unnecessary part remains in the layout of the control board 20, and the demand for space saving of the control unit cannot be met.
JP-A-2-177588 JP-A-2-288175

  Therefore, in order to save the space of the control board, there is a problem to be solved in that the connection portion can be shared by the two types of connection methods of the FPC connection and the cable connector connection on the control board.

  The object of the present invention is not to provide separate connection portions for the two types of connection methods of the FPC connection and the cable connector connection on the control board, but to provide a common connection portion for the two types of connection methods. By doing so, it is to provide a control board connection structure that enables space saving of the control board.

  In order to solve the above-described problems, the connection structure of the control board according to the present invention is provided with a common connection part that can connect both the FPC connector and the cable connector connection receptacle on the control board.

  According to this connection structure of the control board, either the FPC connector that is FPC connected to the control board or the cable connector connection receptacle that is connected to the cable connector is connected to the control board. In this case, the connection portion for the connector on the unused side is not idled because it is connected to the shared connection portion.

  In this control board connection structure, the common connection portion has a first pin hole array that receives the connection pins of the FPC connector and a second pin hole array that receives the connection pins of the cable connector connection receptacle. A pin hole arrangement. In other words, since most of the pins of the second pin hole array are included in the first pin hole array, the exclusive area of the shared connection portion can be made substantially the same as the FPC connector connection portion as a whole. .

In this control board connection structure, the pin hole array of the shared connection portion is arranged with a first pin hole array arranged at a predetermined pitch interval, and the first pin hole array aligned with the same pitch interval as the pitch interval. The second pin hole array is parallel to the second pin hole array in a state shifted by half the pitch interval, and the first pin hole array includes a part of the first pin hole array and the second pin hole array. And the second pin hole array may comprise the first pin hole array.
For example, the first pin hole row is a pin hole row in which 7 pieces are arranged with a pitch interval of 2.5 mm, and the second pin hole row is also set to a pitch interval of 2.5 mm and shifted by 1.25 mm which is half the pitch interval. Six pin hole rows can be arranged in parallel with the first pin hole row. Therefore, the pin hole array is composed of a total of 13 pin holes, and the first pin hole row and the second pin hole row are arranged at equal intervals in a staggered manner.
The first pin hole array used in the connection of the FPC connector is an FPC connector consisting of six consecutive pin holes in the first pin hole row and six pin holes that are all in the second pin hole row. It can be composed of 12 pin holes corresponding to the pin arrangement. Further, the second pin hole array used in the connection of the cable connector can be composed of all seven pin holes of the first pin hole row into which the seven pins of the receptacle are inserted.

  In this control board connection structure, the board with specifications for FPC connection can be an FPC operation board, and the board with specifications for cable connector connection can be a connector operation board. Further, by absorbing the difference in electrical characteristics of the two operation boards by changing the connection destination and the signal level, according to the FPC operation board or the connector operation board to be connected to the shared connection portion, Electrical connection to the control board or each operation board can be performed. Since the connection destination and signal level when connecting the cable connector are different from the connection destination of FPC connection, by changing the connection destination and signal level and absorbing these differences, the control board and the operation board The electrical connection is made. The connection destination and the signal level can be changed by, for example, dip switch switching.

  Since the board connection structure according to the present invention is configured as described above, the following effects can be obtained. That is, since the control board connection structure is provided with a common connection portion that can connect both the FPC connector and the receptacle for connecting the cable connector to the control board, the FPC connector that is FPC connected to the control board and the cable In either case, the cable connector connection receptacle connected to the connector can be connected to the common connection portion. By providing the shared connection portion in this manner, an idle space on the control board, that is, a dead space is eliminated, and the size of the control board can be reduced accordingly.

  FIG. 1 shows an embodiment of a control board connection structure according to the present invention. A connection structure 1 shown in FIG. 1 is a common connection portion 2 to which both an FPC connector and a cable connector connection receptacle can be connected. That is, the shared connection portion 2 has a pin hole array in which a first pin hole array 3 that receives FPC connector connection pins and a second pin hole array 4 that receives connection pins of a cable connector connection receptacle are overlapped. is doing. That is, the first pin hole array 3 and the second pin hole array 4 partially overlap, and in the illustrated example, six pin holes are common in each pin hole array.

  The pin hole arrangement of the shared connection part 2 is arranged with the same pitch interval p as the first pin hole row 5 arranged at a predetermined pitch interval p and is half the pitch interval with respect to the first pin hole row 5. It consists of a second pin hole array 6 that is parallel in a state shifted at (p / 2). In the illustrated example, the first pin hole row 5 is a row of seven pin holes 7 (only a part is given a reference numeral) with a pitch interval p of 2.5 mm. Further, the second pin hole row 6 has a pitch interval p of 2.5 mm inches, and is shifted by 1.25 mm which is half the pitch interval p, and six pin holes 8 (one pin lined up in parallel with the first pin hole row) This is a column in which only the part is given a reference numeral. Therefore, the pin hole array is composed of a total of 13 pin holes 7 and 8, and the first pin hole array 5 and the second pin hole array 6 are arranged in a staggered manner at equal intervals.

The first pin hole array 3 used in the connection of the FPC connector includes a part of the first pin hole array 5 (six consecutive pin holes 7) and the whole of the second pin hole array 6 (six consecutive pins). And 12 holes corresponding to the pin arrangement of the FPC connector.
The second pin hole array 4 used for connecting the cable connector is composed of the entire first pin hole array 5 (seven consecutive pin holes 7) into which the seven pins of the receptacle are inserted. Since most of the pins of the second pin hole array 4 are included in the first pin hole array 3, as a whole, the exclusive area of the shared connection part 2 is substantially the same as that of the first pin hole array 3 which is an FPC connector connection part. It can be an equal occupied area.

  FIG. 2 is a peripheral circuit diagram including a microcomputer as a control board when an FPC which is a 4 × 8 matrix operation board is used. 2, G1 to G8 are connector terminal numbers for transmitting output signals from the microcomputer (control board) to the FPC (operation board), and G9 to G12 are connector terminal numbers for transmitting output signals from the FPC to the microcomputer. To express. This is the same even when an n × m matrix is used.

  The connector CN-A is an FPC connector having a pin pitch of 1.25 mm as shown in FIG. Since the odd-numbered pins and the even-numbered pins are arranged side by side in a row, the odd-numbered pins and the even-numbered pins are arranged on a straight line with a pin pitch (p) of 2.5 mm. As shown in the photograph of FIG. 4, the FPC connector (connector CN-A) 11 is attached to the shared connection portion 2 of the control board 10. The FPC connector 11 may be equivalent to the FPC connector 30 shown in FIGS. An FPC (not shown) as an operation board is connected to the FPC connector 11 via a flexible flat cable, and is connected to the control board 10 via the FPC connector 11.

  As shown in FIG. 6, the relationship between the connector terminal numbers G1 to G12 of the FPC and the whereabouts of the connection pins to which the connectors are connected to the control board is shown. That is, G1 to G8 correspond to pin numbers 1 to 8 in the microcomputer, and G9 to G12 correspond to pin numbers 9 to 12 in the microcomputer. In the FPC, F1 to F9 correspond to dedicated keys for performing a function for setting a cooking function as applied to a cooking device.

  FIG. 3 is a peripheral circuit diagram including a microcomputer connected by cable connector connection when a 2 × 2 matrix tact switch and an encoder are used as the operation unit. In FIG. 3, the connector terminal number, the first pin is a ground, and the second and third pins are terminals for transmitting an output signal from the encoder to the microcomputer. Pins 4 and 5 are connector terminal numbers that transmit an output signal from the microcomputer to the tact switch, and pins 6 and 7 transmit an output signal when the tact switch is pressed to the microcomputer. This is the same even when the number of switches increases.

  As shown in FIG. 5, which is a photograph, a state where the harness connector (that is, the connector CN-B or the cable connector connection receptacle) 12 is attached to the shared connection portion 2 of the control board 10 is shown. Yes. An operation board (not shown) including a tact switch and an encoder is connected to the harness connector 12 via a cable connector, and is connected to the control board 10 via the harness connector 12. The connector CN-B is a connector to be connected using a harness having a pin pitch of 2.5 mm. Pin numbers 1 to 7 correspond to connector terminal numbers GND, G2, G4, G6, G8, G10, and G12 in order. FIG. 7 shows the connector terminals and control board of the tact switch and encoder. The relationship between the connection pins (pin numbers 1 to 7) to be connected is shown.

  According to the present invention, either the FPC connector (connector CN-A; shown in FIG. 4) 11 or the harness connector (connector CN-B; shown in FIG. 5) 12 is located at the same position on the control board 10 depending on the selection. It is possible to use different connectors depending on the application.

  In this embodiment, when the connector CN-B is mounted, a receptacle 41 (see FIG. 10) having a mounting hole corresponding to the connector CN-B pin array is provided on the control board.

  When mounting the connector CN-B, it is mounted in the mounting holes of the even numbered pin array of the connector CN-A and the pins of the connector CN-B are connected to the control board, so that the 2nd to 7th connectors of the connector CN-B The pins are connected to the connection holes corresponding to the even pins of G2, G4, G6, G8, G10, and G12 of the connector CN-A of the mounting hole. That is, the connector CN-B is connected to the first pin hole array 5 having 7 pins as shown in FIG. When the GND terminal is used with the connector CN-B, the GND terminal is connected to the GND pattern on the substrate in order to use an encoder.

  When the pin layout of the connector CN-A and the connector CN-B does not consider the connection compatibility when such a connection is made, a necessary signal is transmitted when connecting using any one of the connectors. There is a high possibility that it will not perform the necessary operation. In this embodiment, in the design of the control board, the connector CN-A and the connector CN-B are determined in consideration of the connection compatibility, and the component mounting is changed in accordance with the specifications. The connection compatibility between -A and connector CN-B is realized.

  In this embodiment, the encoder output signal is output to the 2nd and 3rd pins. Here, since the resistors R61 and R63 are not mounted, the output signal is not transmitted to the input terminal of the microcomputer.

  Here, as shown in the circuit diagram, terminals G2 and G11, G4 and G9 are preliminarily prepared on the board, jumpers are mounted at positions J16 and J17, and the jumpers are connected when the FPC is used. By mounting a resistor on J15 and mounting a capacitor on C64 and C65 that were not mounted when using the FPC, the encoder signal is transmitted to the microcomputer input terminal via G11 and G9. Can be read. Here, the resistors R68 and R70 are not mounted.

In addition, since the encoder signal is a pulse waveform, when it is read by a microcomputer, it is easier to read from an input terminal having a timer function than to read from a normal input terminal.
Here, the encoder signal will be described. As shown in FIG. 11, the encoder outputs two pulse waveforms of A phase and B phase. The microcomputer determines whether the encoder is normal rotation or reverse rotation based on the phase difference of the pulse waveform. For example, at the rise of the A-phase pulse waveform, if the B-phase pulse waveform is at the High level, it is determined to be normal rotation, and if it is at the Low level, it is determined to be reverse.

Furthermore, a circuit is assembled in a matrix form similar to that of FPC so that as many tact switches as possible can be mounted.
Here, signal detection of the tact switch will be described. As shown in FIG. 12, the output terminal of the microcomputer outputs a stroke signal at regular intervals. Therefore, when the tact switch is pressed, the contact is connected, and a signal is transmitted and read by the input terminal of the microcomputer, and it is determined that the switch is turned on. When the tact switch is not pressed, it is pulled up by a resistor connected to the input terminal side of the microcomputer, and the microcomputer determines that the level is high and determines that the switch is not turned on.

  As described above, the connector CN-A or connector CN-B corresponding to the FPC or ribbon connector of the operation board selected according to the specification is mounted in the mounting hole of the control board, and the jumper is also adjusted according to the specification. By providing, without changing the board area, change the constants and jumpers of the resistors and capacitors required according to the specifications, and connect the control board to the operation board to create a control circuit with the desired specifications. Can be manufactured.

The top view of the shared connection part used for the connection structure of the control board by this invention. The circuit diagram in the case of using FPC as an operation board. The circuit diagram at the time of using a tact switch and an encoder as an operation part. The photograph which took the connector for FPC connected to the common connection part shown in FIG. The photograph figure which took the connector for harness connection connected to the common connection part shown in FIG. The wiring diagram which shows an example of the 12 pin connector of the connection structure of the control board shown in FIG. The wiring diagram which shows an example of the 7-pin connector of the connection structure of the control board shown in FIG. The photograph which took the example of connection of the FPC connector to the conventional control board diagonally. The perspective view which shows an example of the conventional 12 pin FPC connector connected to a control board. The perspective view which shows an example of the conventional 7 pin cable connector and connector receptacle connected to a control board. The figure which shows the pulse waveform of an encoder. The figure which shows the signal waveform of a tact switch.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Connection structure 2 Common connection part 3 1st pin hole arrangement | sequence 4 2nd pin hole arrangement | sequence 5 1st pin hole row | line | column 6 2nd pin hole row | line | column 7 Pin hole 8 Pin hole 10 Control board 11 FPC connector 12 Connector for harness (cable connector) Receptacle for connection)
20 Control board 21 Connection part (for mounting FPC connector)
22 Connection (for receptacle mounting)
30 FPC connector 31 Flexible terminal 32 Connection pin 40 Cable connector 41 Receptacle 42 Cable 43 Connection pin p Pitch interval

Claims (5)

  A control board connection structure comprising a common connection portion to which both an FPC connector and a cable connector connection receptacle can be connected.   The common connection portion has a pin hole array in which a first pin hole array that receives a connection pin of the FPC connector and a second pin hole array that receives a connection pin of the cable connector connection receptacle are overlapped. The control board connection structure according to claim 1, comprising:   The pin hole arrangement of the shared connection portion includes a first pin hole row arranged at a predetermined pitch interval, and a line at the same pitch interval as the pitch interval, and half the pitch interval with respect to the first pin hole row. The first pin hole array is composed of a part of the first pin hole array and the second pin hole array, and the second pin hole array is parallel to the second pin hole array. The control board connection structure according to claim 2, wherein the pin hole array includes the first pin hole array.   4. The board having a specification connected to the control board by the FPC connector is an FPC operation board, and the board having a specification connected by the cable connector connection receptacle is a connector operation board. The connection structure of the control board according to any one of the above.   The control board is adapted to the FPC operation board or the connector operation board to be connected to the shared connection part by absorbing the difference in electrical characteristics between the operation boards by changing the connection destination and the signal level. 5. The control board connection structure according to claim 4, wherein the control board is electrically connected to each operation board.

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