JP2009188351A - Electrical substrate having lsi, image formation control panel, and image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate operation confirmation and failure analysis of an LSI connected to a main substrate by a bottom ball to make the operation of the LSI accurate. <P>SOLUTION: The electrical substrate includes the main substrate 10b having the LSI 16 formed on its first surface and with first wiring 33 at a ground potential and second wiring 34 at a supply potential wired to form a sandwiched inner layer; a via group 35 with the bottom ball 31 of the LSI joined and extending on a second surface of the main substrate 10b and a controlling via 37 connected to the first or second wiring and extending on the second surface; and an auxiliary substrate 20 having a first ball 42 joined to a side end of a second surface of a via 36 in the via group 35 joined to a usual operation mode/test mode instruction signal-applied terminal ball 32 and a second ball 43 joined to the controlling via 37 on its surface, and having a first via 46 with the first ball 42 joined, a second via 47 with the second ball 43 joined and wiring 48 with the first and second vias connected. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electrical board mainly composed of a printed circuit board equipped with an LSI, an image formation control board using the same, and an image forming apparatus, and more particularly, to printed wiring by terminal connection balls arranged in high density on the bottom surface of the LSI. The present invention relates to a printed circuit board equipped with a highly integrated LSI that electrically connects LSI terminals. This electrical board can be used as a circuit board that performs electronic control, electronic information processing, and storage of various electrical devices on a relatively large scale. For example, the present invention can be used in computers or servers including printers, document scanners, copiers, personal computers, and the like.

JP 2005-191355 A Japanese Patent Laid-Open No. 2003-347496.

  In recent years, the degree of integration of large scale integrated circuits (LSIs) has increased due to technological innovation. In such an LSI, since a plurality of functional elements are integrated in one LSI, the number of signal line pins of the LSI package is increasing. On the other hand, as the number of pins increases, packages are becoming smaller, so high-density mounting technology is required when mounting on a substrate.

  As shown in FIG. 13, Patent Document 1 presents a module substrate in which IC1 and IC2 are mounted facing both sides of a printed circuit board MB, and between both ICs is connected by a through via that penetrates the substrate in the thickness direction. ing. Patent Document 2 discloses an auxiliary substrate having a multilayer structure in which a ground wiring and a power supply wiring are sandwiched in an inner layer. The auxiliary substrate is formed with a noise-preventive ground solid pattern on one surface, and is connected to a through via connected to an LSI terminal of a main substrate equipped with an LSI by a terminal connection ball on the other surface.

  In the method shown in FIG. 13, IC1 and IC2 which are LSIs mounted on both sides of the printed circuit board MB are connected to the connection balls 31 on the bottom surface of each IC by the through vias 35 of the printed circuit board MB. ing. IC1 and IC2 are connected by the shortest wiring with a through via 35, but the wiring is sandwiched between IC1 and IC2 and penetrates the printed circuit board MB so that it cannot be visually observed from the outside. In addition, it is impossible to connect a probe or the like (probing). In the case of such a configuration, if the mounting of IC1 or IC2 is defective, or if a failure occurs in the operation of IC1 or IC2, neither visual inspection nor probing is possible, so it is very difficult to identify the cause of the occurrence. . In order to identify the cause of the occurrence, work such as removal of IC1 and IC2 occurs, and the cause analysis efficiency is low. At the same time, normal operation cannot be performed by removing IC1 and IC2, so it is difficult to analyze the failure. Further, there is a possibility that the cause of occurrence disappears or enlarges by removing IC1 and IC2. Since wiring cannot be pulled out even if post-processing (repair) is attempted when a failure occurs, it is necessary to re-create the printed circuit board MB, which takes time and money.

  The first object of the present invention is to facilitate operation confirmation or failure analysis of an LSI connected to a printed circuit board with a connection ball on the bottom surface. In addition, the operation of the LSI connected to the printed circuit board is made accurate. This is the second purpose.

(1) The first surface (10s1), which is the surface, is equipped with an LSI (16), and the first wiring (33) to which the first constant potential is applied and the second wiring to which the second constant potential is applied ( 34) Main printed circuit board (10b) with inner layer wiring in a sandwich shape;
In the main printed circuit board (10b), the terminal connection ball (31) on the bottom surface of the LSI (16) is joined to one end, and the other side on the second surface (10s2) side which is the back surface of the main printed circuit board (10b). Through-via group for LSI (35) having an end, and control through-via (37) having one end connected to the first or second wiring (33/34) and the other end on the second surface (10s2) side );and,
In the through via group for LSI (35), through vias joined to the connection balls (32) of the signal terminals to which a control signal for instructing the LSI (16) to operate in the normal operation mode or the trial mode is applied ( 36) having a first connection ball (42) joined to the end of the second surface (10s2) side and a second connection ball (43) joined to the control through via (37) on the surface. Furthermore, a first through via (46) to which the first connection ball (42) is joined, a second through via (47) to which the second connection ball (43) is connected, and the first through via (46 ) And a wiring (48) connecting the second through via (47), a first auxiliary printed circuit board (20);
An electrical board equipped with an LSI (FIGS. 1 to 6).

  In addition, in order to make an understanding easy, the code | symbol or corresponding matter of the corresponding | compatible element of the Example shown in drawing and mentioned later in parentheses was added as reference for reference. The same applies to the following.

  According to the above (1), when the first auxiliary printed circuit board (20) is not mounted, that is, separated from the main printed circuit board (10b), the LSI (16) can shift to the trial mode, and the LSI on the first surface Probing can be performed on the LSI (16) from the second surface side of the main printed circuit board (10b) without removing. It is possible to facilitate analysis when a failure occurs.

(2) The LSI (16) operates in a normal operation mode when the ground potential (L) of the first wiring (33) is applied to a signal terminal to which the control signal is applied, and the second operation is performed. It operates in a trial mode when the power supply potential (H) of the wiring (34) is applied or the signal terminal is released (no external potential is applied);
One end of the control through via (37) in the main printed circuit board (10b) is connected to the first wiring (33);
The electrical board | substrate equipped with LSI of Claim 1.

  According to this, when the first auxiliary printed circuit board (20) is mounted, that is, when connected to the main printed circuit board (10b), the first signal terminal to which the control signal of the LSI (16) is applied is first. The ground potential (L) of the wiring is applied, and the LSI (16) operates in the normal operation mode. When not mounted, that is, when separated from the main printed circuit board (10b), the signal terminal to which the control signal of the LSI (16) is applied is released. Therefore, the LSI (16) operates in the trial mode, and the first side Probing from the second surface side of the main printed circuit board (10b) to the LSI (16) can be performed without removing the LSI. Easy analysis when a problem occurs.

(3) LSI (16) is equipped on the first surface (10s1) which is the surface, and the first wiring (33) to which the first constant potential is applied and the second wiring to which the second constant potential is applied ( 34) Main printed circuit board (10b) with inner layer wiring in a sandwich shape;
In the main printed circuit board (10b), the terminal connection ball (31) on the bottom surface of the LSI (16) is joined to one end, and the other side on the second surface (10s2) side which is the back surface of the main printed circuit board (10b). A through via group (35) for LSI having an end, a first through via (37) for control having one end connected to the first wiring (33) and the other end on the second surface (10s2) side, and A second through via for control (38) having one end connected to the second wiring (34) and the other end on the second surface (10s2) side;
In the through via group for LSI (35), through vias joined to the connection balls (32) of the signal terminals to which a control signal for instructing the LSI (16) to operate in the normal operation mode or the trial mode is applied ( 36), the first connection ball (42) joined to the end of the second surface (10s2) side, and the second connection ball (43) joined to the control first through via (37) In addition, a first through via (46) to which the first connection ball (42) is joined, a second through via (47) to which the second connection ball (43) is connected, and the first through via A first auxiliary printed circuit board (20) equipped with (46) and wiring (48) connecting the second through via (47); and
In the through via group for LSI (35), through vias joined to the connection balls (32) of the signal terminals to which a control signal for instructing the LSI (16) to operate in the normal operation mode or the trial mode is applied ( 36), the first connection ball (52) joined to the end on the second surface (10s2) side, and the second connection ball (57) joined to the second through-via for control (38) And a first through via (56) to which the first connection ball (52) is joined, a second through via (59) to which the second connection ball (57) is connected, and the first through via. A second auxiliary printed circuit board (50) equipped with (56) and a wiring (58) connecting the second through via (59);
An electrical board equipped with an LSI (FIG. 7).

  According to this, a plurality of functions of the LSI (16) can be switched by selectively mounting different types of auxiliary printed circuit boards (20/50). In addition, by not mounting the auxiliary printed circuit board (20/50), it is possible to shift to the trial mode. It is possible to switch to trial mode while switching the function of integrated circuit components using only the auxiliary printed circuit board (20/50), and it is possible to switch and analyze the function when a problem occurs. Leading to ease.

  (4) When the ground potential (L) of the first wiring (33) is applied to the signal terminal to which the control signal is applied, the LSI (16) operates in the normal operation mode, and the second It operates in a trial mode when the power supply potential (H) of the wiring (34) is applied or the signal terminal is released (no external potential applied); the electrical board equipped with LSI as described in (3) above .

  (5) The auxiliary printed circuit board (20, 50) has one end connected to the connection ball on the auxiliary printed circuit board to which the LSI through via group (35) of the main printed circuit board (10b) is joined, and the other end is auxiliary. 5. A wiring including an additional LSI connection through via (60, 62, 63, 64) on the back side of the printed circuit board; and the electrical equipment equipped with the LSI according to claim 1. Substrate (FIG. 8).

  Since additional processing and correction (addition of circuits, etc.) that were impossible with conventional technology can be realized on the auxiliary printed circuit board (20, 50), it is possible to reduce the number of days and costs for countermeasures against defects and improve efficiency. It is possible to take good measures.

  (6) The additional LSI is an FPGA; The electrical board equipped with the LSI according to (5) above.

  (7) The auxiliary printed circuit board (20, 50) has one end connected to the connection ball on the auxiliary printed circuit board to which the LSI through via group (35) of the main printed circuit board (10b) is joined, and the other end is auxiliary. Auxiliary printed circuit board (20, 50) with wiring including through vias (60, 62, 63, 64) for connecting an additional frequency variable clock generation package (90) on the back side of the printed circuit board The back surface of the clock generation package (90) is provided with a control wiring (91) for controlling the frequency of the clock generation package (90) and a connector (92) or a dip switch connected to the wiring. An electrical board equipped with an LSI according to any one of (1) to (4) (FIG. 9);

  By changing the frequency, the error occurrence condition can be changed, and the efficiency of failure analysis can be improved.

  (8) A ground through via (39) having one end connected to the first wiring (33) to which a ground potential is applied and the other end on the second surface (10s2) side is connected to the main printed circuit board (10b). And a power supply via (40) having one end connected to the second wiring (34) to which a power supply potential is applied and the other end on the second surface (10s2) side; and the auxiliary printed circuit board (20, 50) includes a ground connection ball (67) to be joined to the ground through via, a power connection ball (68) to be joined to the power through via (40), and one end connected to the ground connection ball (67) and the other end A ground connection via (65) on the back side of the auxiliary printed circuit board and a power connection via (66) on one end connected to the power connection ball (68) and the other end on the back side of the auxiliary printed circuit board; An electrical board equipped with an LSI according to any one of 1) to (7) (FIG. 11).

  (9) The ground connection via (65) and the power supply connection via (66) of the auxiliary printed circuit board (20, 50) are bypass capacitor (72) connection terminals; equipped with the LSI according to (8) above Electrical board to be used.

  The addition of the power supply bypass capacitor (72), which was impossible with the conventional technology, can be realized on the auxiliary printed circuit board (20, 50). It is possible to take measures.

  (10) The auxiliary printed circuit board (20, 50) includes an external ground terminal (79) connected to the other end of the ground connection via (65) of the auxiliary printed circuit board (20, 50) and the auxiliary printed circuit board ( 20. An external power supply terminal (80) connected to the other end of the power supply connection via (66) of 20, 50); an electrical board equipped with an LSI according to (8) above (FIG. 12).

  The first and second wirings (33, 34) of the main printed circuit board (10b) are disconnected from the main printed circuit board power supply and externally connected to the external ground terminal (79) and external power supply terminal (80) of the auxiliary printed circuit board (20). By changing the power supply, such as adjusting the applied voltage by connecting the power supply, the failure occurrence condition can be changed, and the efficiency of failure analysis can be improved.

(11) An image processing LSI (16) for processing the input image data into recording image data that conforms to the image expression characteristics of the printer (9) that prints an image on paper, and the recording image data to the printer (9). CPU (12), which is an LSI that controls image I / F (15) to be output, input of image data, image data processing by the image processing LSI (16) and output to the printer (9), and the CPU A RAM (13) for reading and writing and a ROM (14) storing an operation program for the CPU are provided on the first surface (10s1), which is a surface, and a first wiring (33) to which a first constant potential is applied and A main printed circuit board (10b) in which a second wiring (34) to which a second constant potential is applied is sandwiched in an inner layer;
In the main printed circuit board (10b), the terminal connection ball (31) on the bottom surface of the image processing LSI (16) is joined to one end and the second surface (10s2) side which is the back surface of the main printed circuit board (10b). LSI through-via group (35) having the other end, and control through-via having one end connected to the first or second wiring (33/34) and the other end on the second surface (10s2) side (37); and
In the through via group for LSI (35), through vias joined to the connection balls (32) of the signal terminals to which a control signal for instructing the LSI (16) to operate in the normal operation mode or the trial mode is applied ( 36), the first connection ball (42) joined to the end of the second surface (10s2) side, and the second connection ball (43) joined to the control through via (37) on the surface, Further, a first through via (46) to which the first connection ball (42) is joined, a second through via (47) to which the second connection ball (43) is connected, and the first through via (46) And a first auxiliary printed circuit board (20) equipped with a wiring (48) connecting the second through via (47);
An image formation control board (FIG. 2).

(12) An image processing LSI (16) that processes the input image data into recording image data that conforms to the image representation characteristics of the printer (9) that prints an image on paper, and the recording image data is sent to the printer (9). CPU (12), which is an LSI that controls image I / F (15) to be output, input of image data, image data processing by the image processing LSI (16) and output to the printer (9), and the CPU A RAM (13) for reading and writing and a ROM (14) storing an operation program for the CPU are provided on the first surface (10s1), which is a surface, and a first wiring (33) to which a first constant potential is applied and A main printed circuit board (10b) in which a second wiring (34) to which a second constant potential is applied is sandwiched in an inner layer;
In the main printed circuit board (10b), a through via group for CPU having a terminal connection ball on the bottom surface of the CPU (12) joined to one end and the other end on the second surface side which is the back surface of the main printed circuit board, And a control through via having one end connected to the first or second wiring (33/34) and the other end on the second surface side; and
Of the through via group for CPU, the second surface of the through via joined to the connection ball of the signal terminal to which the control signal for instructing the CPU (12) to operate in the normal operation mode or the trial mode is applied ( A first connection ball bonded to the end on the side of 10s2) and a second connection ball bonded to the control through via; and a first through via bonded to the first connection ball; A first auxiliary printed circuit board (100) equipped with a second through via to which two connection balls are connected, and a wiring connecting the first through via and the second through via;
An image formation control board (FIG. 3).

(13) An image processing LSI (16) for processing the input image data into recording image data that conforms to the image representation characteristics of the printer (9) that prints an image on paper, and the recording image data to the printer (9). CPU (12), which is an LSI that controls image I / F (15) to be output, input of image data, image data processing by the image processing LSI (16) and output to the printer (9), and the CPU A RAM (13) for reading and writing and a ROM (14) storing an operation program for the CPU are provided on the first surface (10s1), which is a surface, and a first wiring (33) to which a first constant potential is applied and A main printed circuit board (10b) in which a second wiring (34) to which a second constant potential is applied is sandwiched in an inner layer;
In the main printed circuit board (10b), the terminal connection ball (31) on the bottom surface of the image processing LSI (16) is joined to one end and the second surface (10s2) side which is the back surface of the main printed circuit board (10b). LSI through-via group (35) having the other end, and control through-via having one end connected to the first or second wiring (33/34) and the other end on the second surface (10s2) side (37);
In the through via group for LSI (35), through vias joined to the connection balls (32) of the signal terminals to which a control signal for instructing the LSI (16) to operate in the normal operation mode or the trial mode is applied ( 36), the first connection ball (42) joined to the end of the second surface (10s2) side, and the second connection ball (43) joined to the control through via (37) on the surface, Further, a first through via (46) to which the first connection ball (42) is joined, a second through via (47) to which the second connection ball (43) is connected, and the first through via (46) And an LSI auxiliary printed circuit board (20) equipped with a wiring (48) connecting the second through via (47);
In the main printed circuit board (10b), a through-via group for CPU having a terminal connection ball on the bottom surface of the CPU (12) bonded to one end and having the other end on the second surface side which is the back surface of the main printed circuit board, And a control through via having one end connected to the first or second wiring (33/34) and the other end on the second surface side; and
Of the through via group for CPU, the second surface of the through via joined to the connection ball of the signal terminal to which the control signal for instructing the CPU (12) to operate in the normal operation mode or the trial mode is applied ( A first connection ball bonded to the end on the side of 10s2) and a second connection ball bonded to the control through via; and a first through via bonded to the first connection ball; A CPU auxiliary printed circuit board (100) equipped with a second through via to which two connection balls are connected, and a wiring connecting the first through via and the second through via;
An image forming control board (FIGS. 2 and 3).

  (14) The main printed circuit board (10b) is further equipped with an extended function I / F (18) for inputting document information provided by an external computer or facsimile on the first surface (10s1) as the surface; The image formation control board as described in any one of 11) thru | or (13) (FIG. 2).

  (15) The image I / F (15) has a function of inputting image data output from the document scanner (8); the image processing LSI (16) is an image of image data output from the document scanner (8). The image formation control board according to any one of the above (11) to (14) (FIG. 2), which has a function of correcting reading distortion and converting it into image data having a predetermined characteristic format.

  (16) The main printed circuit board (10b) is further equipped with an operation unit I / F (17) for inputting / outputting operation inputs and display outputs of the operation display board on the first surface (10s1) as a surface; (11) The image formation control board as described in any one of (15) (FIG. 2).

  (17) A printer (9) that forms an image represented by the recorded image data on a sheet; and the image formation control board according to any one of (11) to (16), and the image formation control. The image I / F (15) on the plate outputs the recording image data to the printer (9); an image forming apparatus (FIG. 1).

  (18) A printer (9) that forms an image represented by recorded image data on a sheet; a document scanner (8) that reads an image on a document and outputs image data representing the image; and the above (15) An image forming control board; the image I / F (15) of the image forming control board inputs image data output from the document scanner (8); and the recording image data is input to the printer (9). Output; image forming apparatus.

  Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

<First embodiment>
FIG. 1 shows an outline of an image forming apparatus according to a first embodiment of the present invention. The first embodiment is a copying machine having a composite function, and a printer 9, a document scanner 8, an operation display board 7, a printer controller 6 and a fax controller 4 are connected to a main controller 10. The document scanner 8 includes an automatic document feeder, a contact glass, and a document scanning mechanism. In a mode in which an image of a document loaded on a document tray of the automatic document feeder is read, the document scanning mechanism is stopped and automatic document feeding is performed. The image of the document transported by the feeding device is projected onto the CCD whose position is fixed through the optical lens by the mirror of the document scanning mechanism. So-called sheet-through reading is performed. In reading an original placed on the contact glass, the original scanning mechanism scans the mirror along the contact glass surface (sub-scanning), and continuously projects the image of each part of the original onto the CCD. A video signal generated by the CCD is converted into digital data, that is, image data by an image processing circuit inside the document scanner 8 and output to the main controller 10.

  The printer 9 is a tandem color laser printer, and forms an image on a sheet by an electrophotographic image forming method using recorded image data provided by the main controller 10. The scanning display board 7 designates image handling such as scanner (scanner distribution), printing, copying and facsimile transmission, and instructs execution thereof. The printer controller 6 communicates with an external information device such as a personal computer or a server, converts the print command document information provided from them into image data, that is, image data, and supplies the image data to the main controller 10. An external I / F (interface) 5 performs communication between the external device and the printer controller 6. The fax controller 4 performs facsimile transmission / reception with an external facsimile or a facsimile function of an external personal computer. In the case of transmission, image data output from the document scanner 8 is converted into facsimile transmission data via the main controller 10. Convert and send to the communication line. The communication I / F 3 controls facsimile communication between the fax controller 4 and the partner facsimile.

  FIG. 2 shows an outline of the configuration of the main controller 10. The image processing LSI 16 performs processing for correcting image reading distortion and converting the image data from the document scanner 8 into image data having a predetermined characteristic format. The conversion of the image data format is a format suitable for receiving image data as an output destination. Output image data formats include monochrome binary, gray scale (monochrome multivalue), sRGB, JPEG, Adobe-RGB data, and others.

  The image processing LSI 16 also performs image adjustment and processing on image data output from the document scanner and image data input from the printer controller 6 and the facsimile controller 4, and image processing suitable for an output destination designated by the user. Apply. One of the typical image processing is conversion into recording image data that matches the drawing characteristics of the printer 9.

  The CPU 12, which is an LSI package, is a microprocessor that controls the entire control of the main controller 10, and is the main body of the image processing system. The RAM 13 stores temporarily exchanged data to absorb the speed difference between the sending side and the receiving side at the time of image data transfer and the slow processing timing of the connected components, and the CPU 12 forms the main image. It is a volatile memory that temporarily stores programs and intermediate processing data when controlling the apparatus. Since the CPU 12 is required to perform high-speed processing, the system is activated by a boot program stored in the ROM 14 at the normal activation, and thereafter, the CPU 12 is read from the ROM 14 and developed in the memory 13 accessible at high speed. Control each part.

  The image I / F 15 includes a bus control device. In addition to inputting image data of the document scanner 8 to the internal system bus 11 and outputting recorded image data from the internal system bus 11 to the printer 9, the image I / F 15 uses the internal system bus 11. The data transfer between elements in the main controller 10 is controlled. The operation unit I / F 17 inputs and outputs operation inputs and display outputs of the operation display board 7 to and from the CPU 12. The extended function I / F 18 inputs image data input by the printer controller 6 to the image processing LSI 16 via the internal system bus 11, and transfers image data between the fax controller 4 and the image processing LSI 16 to the internal This is done via the system bus 11.

  FIG. 3 shows an outline of the arrangement of the main LSI, the image processing LSI 16 and the CPU 12, on the first surface 10s1 which is the front surface of the main printed circuit board 10b which is the main controller board equipped with the main controller 10. The main printed circuit board 10b is a printed circuit board having circuit wiring on both surfaces and inner layers of an insulating material. The wiring auxiliary printed circuit boards 20 and 100, which are the first auxiliary printed circuit boards, are printed circuit boards having the same wiring structure as the main printed circuit board 10b. The image processing LSI 16 and the CPU 12 which are integrated circuit components are electronic devices including a semiconductor chip and a package having a multi-pin structure. Each function of the image processing LSI 16 includes a normal operation mode in which the originally intended image processing function is exhibited, and a trial mode in which a test function inside the component and / or an alternative image processing function in which the originally intended function is changed are exhibited. Are provided in advance, and the function can be switched by applying a ground potential (−) or a power supply potential (+) to the function setting terminal (32) or by opening. The trial mode can be shifted by the potential setting of the function setting terminals (32, 36: FIG. 5).

  The CPU 12 exhibits a normal operation mode in which the originally intended image processing control function including image formation control is exhibited, and an alternative image processing control function in which the internal test function and the originally intended image processing control function are changed. Each function of the trial mode is provided in advance, and can be switched by applying a ground potential (−) or a power supply potential (+) to the function setting terminal or by opening. The CPU 12 can also shift to the trial mode by setting the potential of the function setting terminal. In this embodiment, both the LSI 16 and the CPU 12 shift to the trial mode by setting the function setting terminal (32) to the “H” level that is the power supply potential or open (release: no connection with the circuit). To do. On the other hand, by setting the function setting terminal (32) to the “L” level, which is the ground (device ground) potential, it is possible to shift to the normal operation mode.

  The main printed circuit board 10b has elements and circuit wiring of the main controller 10 shown in FIG. 2, but most of them are not shown. In the present embodiment, the wiring auxiliary printed circuit board 20 which is the first auxiliary printed circuit board and the LSI auxiliary printed circuit board respectively connected to the image processing LSI 16 and the CPU 12 on the second surface 10s2 which is the back surface of the main printed circuit board 10b. In addition, there is a wiring auxiliary printed circuit board 100 which is a first auxiliary printed circuit board and is a CPU auxiliary printed circuit board. The connection mode of the wiring auxiliary printed circuit board 100 to the CPU 12 which is an LSI is the same as the connection mode of the wiring auxiliary printed circuit board 20 to the image processing LSI 16 which will be described later, and the structure of the wiring auxiliary printed circuit board 100 will be described later. This is the same as the structure of the auxiliary printed circuit board 20 for wiring.

  4 (a) is an enlarged view of the periphery of the image processing LSI 16 in FIG. 3, which is shown in FIG. 3, and which is shown in FIG. 4 (a). Shown in b). The wiring auxiliary printed circuit board 20 is connected to the external connection terminal (31) of the image processing LSI 16 through the through via 35.

  FIG. 5 shows a cross section of the wiring auxiliary printed circuit board 20 shown in FIG. 4B separated from the main printed circuit board 20. FIG. 6 shows a portion 6A circled in FIG. Enlarged view. The first inner layer wiring 33 of the main printed circuit board 10b is connected to the ground layer to which the device ground (−) of the power supply circuit (not shown) is connected, and the second inner layer wiring 34 is connected to the power supply voltage (+) of the power supply circuit. Power layer. The function setting terminals (connection balls 32) of the LSI 16 mounted on the first surface 10s1 of the main printed circuit board 10b are drawn out to the second surface 10s2 by the through vias 36 of the main printed circuit board 10b. A through via 37 connected to the first inner layer wiring 33 of the main printed circuit board 10b extends to the second surface 10s2. The through via 37 is a signal line that instructs a normal operation mode.

  On the other hand, the wiring auxiliary printed circuit board 20 mounted on the second surface 10s2 is a printed circuit board composed of a plurality of wiring layers, and is similar to the connection ball group 31 that is an external terminal of the LSI 16, that is, a ball-shaped terminal, that is, a connection ball. A group 41 is provided. A part of the connection ball group 41 is connected to the internal wiring of the auxiliary printed circuit board 20 for wiring. When the auxiliary printed circuit board 20 for wiring is mounted on the main printed circuit board 10b, the external connection terminals (vias 35) of the LSI 16 drawn out to the second surface 10s2 are connected to the auxiliary printed circuit board 20 for wiring, The through via 37 (normal operation mode instruction signal line) drawn from the first inner layer wiring 33 (ground layer) of the printed circuit board 10b is similarly connected to the auxiliary printed circuit board 20 for wiring, and at the same time, functions of the main printed circuit board 10b. The through via 36 and the through via 37 (normal operation mode instruction signal line) joined to the connection ball 32 as the setting terminal are connected to the connection balls 42 and 43, the through vias 46 and 47, and the internal wiring 48 of the auxiliary printed circuit board 20 for wiring. As a result, the function setting terminal (connection ball 32) is connected to the ground (33).

  In this embodiment, when the LSI 16 and the auxiliary printed circuit board 20 for wiring are mounted on the main printed circuit board 10b as shown in FIG. 4B (FIG. 6), the function setting terminal (32) of the LSI 16 is Since it is connected to the ground (33), the LSI 16 operates in the normal operation mode. On the other hand, when the auxiliary printed circuit board 20 for wiring is not mounted as shown in FIG. 5, nothing is connected to the function setting terminal (32), so the terminal is opened (released), and the LSI 16 operates in the trial mode. To do.

  3 is connected to the main printed circuit board 10b, and the auxiliary printed circuit board 100 for wiring is the main printed circuit board, similarly to the connection structure of the LSI 16, the main printed circuit board 10b, and the auxiliary printed circuit board 20 for wiring described above. 10b and the CPU 12 are connected.

  According to the first embodiment, when the auxiliary printed circuit board 20 or 100 for wiring is not mounted on the main printed circuit board 10b, the LSI 16 or the CPU 12 shifts to the trial mode, and the LSI 16 or the CPU 12 is removed from the first surface 10s2. Therefore, it becomes possible to facilitate the analysis at the time of occurrence of a malfunction or the execution of an alternative function.

<Second embodiment>
FIG. 7A shows an enlarged portion corresponding to the portion 6A shown in FIG. 4 of the main controller board 10b of the second embodiment. In order to provide versatility, the LSI 16 has a normal operation mode that exhibits an originally intended image processing function, and a trial mode that exhibits an alternative image processing function in which a test function inside the component and an originally intended function are changed. These functions are provided in advance, and can be switched by applying a ground potential (−) or a power supply potential (+) to the function setting terminal (32) or by opening. The function setting terminal (32) is set to the “H” level or opened to shift to the trial mode. On the other hand, when the function setting terminal is set to the “L” level, the mode is shifted to the normal operation mode. A ground (device ground) potential of the power supply circuit is applied to the inner layer wiring 33 of the main printed circuit board 10b, and a power supply potential (+) of the power supply circuit is applied to the inner layer wiring 34.

  The function setting terminal (32) of the LSI 16 mounted on the first surface 10s1 of the main printed circuit board 10b is drawn out to the second surface 10s2 by the through via 36 of the main printed circuit board 10b. Further, as shown in FIG. 7A, a signal line is drawn from the first inner layer wiring 33 of the main printed circuit board 10b to the second surface 10s2 by the through via 37. Similarly, a signal line is drawn out from the wiring portion of the second inner layer wiring 34 to the second surface 10 s 2 by the through via 38. Also in this embodiment, the first inner layer wiring 33 is a ground potential, and the second inner layer wiring 34 is a power supply potential. In this embodiment, the power supply potential is drawn to the second surface 10s2 of the main printed circuit board 10b by the through via 38.

  The first printed auxiliary printed circuit board 20 mounted on the second surface 10s2 is a printed circuit board composed of a plurality of wiring layers, and is a ball-like terminal, like the connection ball group 31 that is an external connection terminal group of the LSI 16. A certain connection ball group 41 is provided. A part of the connection ball group 41 is connected in the first auxiliary wiring board 20 for wiring. This connection can be changed for each wiring auxiliary printed circuit board (20, 50).

  As shown in FIG. 7A, when the first printed auxiliary printed circuit board 20 is mounted on the main printed circuit board 10b, the external connection terminal (via 35) of the LSI 16 drawn out to the second surface 10s2 is A through via 37 (normal operation mode instruction signal line) connected to the wiring auxiliary printed circuit board 20 and drawn from the first inner layer wiring 33 (ground layer) of the main printed circuit board 10b is similarly connected to the wiring auxiliary printed circuit board 20b. At the same time, the through via 36 and the through via 37 (normal operation mode instruction signal line) joined to the connection ball 32 that is a function setting terminal of the main printed circuit board 10b are connected to the connection ball of the auxiliary printed circuit board 20 for wiring. 42, 43, through vias 46, 47 and internal wiring 48, and as a result, the function setting terminal (connection ball 32) is connected to the ground (33). There.

  A second auxiliary printed circuit board 50 to be mounted on the second surface 10 s 2 shown in FIG. 7B is also a printed circuit board composed of a plurality of wiring layers, and a connection ball group 31 that is an external terminal group of the LSI 16. Similarly, a connection ball group 51 which is a ball-shaped terminal is provided. A part of the connection ball group 51 is connected in the second printed auxiliary printed circuit board 50. In this connection, the external terminal group 31 connection circuit of the LSI 16 is changed to a circuit configuration for performing a trial mode that exhibits an alternative image processing function in which a part of the function of the normal operation mode is changed. Further, the second wiring auxiliary printed circuit board 50 has a through via 59 connected to the second inner layer wiring 34 of the main printed circuit board 10b and connected to the through via 38 drawn to the second surface 10s2.

  When the second printed auxiliary printed circuit board 50 is mounted on the main printed circuit board 10b, the external connection terminals (31, 35) of the LSI 16 drawn out to the second surface 10s2 are connected to the second printed auxiliary printed circuit board 50. On the other hand, the power signal line (38) drawn out from the inner layer wiring 34 of the main printed circuit board 10b is similarly connected to the second printed wiring auxiliary printed circuit board 50. At the same time, the function setting terminals (32, 36) are The connection balls 52 and 57, the through vias 56 and 59, and the internal wiring 58 of the auxiliary printed circuit board 50 for the second wiring are connected to the through vias 38 of the main printed circuit board 10b and become the power supply potential that specifies the trial mode. The LSI 16 operates with an alternative image processing function in which the originally intended function is changed.

  As described above, the function setting terminal (32) of the LSI 16 can change the potential level by switching the wiring auxiliary printed board, and the function of the LSI 16 can be switched. Further, by making the wiring auxiliary printed boards 20 and 50 unmounted, the LSI 16 shifts to a test mode different from the above-described alternative image processing function. In the configuration in which the first printed wiring auxiliary printed circuit board 20 or the second printed wiring printed circuit board 50 is connected to the main printed circuit board 10b in the second embodiment, the function switching of the LSI 16 can be performed only by the printed wiring printed circuit board 20/50. Since the transition to the test mode is performed by separating the auxiliary printed circuit board for wiring while realizing it, it is possible to switch the function when the trouble occurs and to analyze it, leading to the ease of analysis. The CPU 12 used in the second embodiment is also connected to the main printed circuit board 10b in the same manner as the LSI 16, and has the same configuration corresponding to the first and second auxiliary printed circuit boards 20 and 50 for wiring. There are auxiliary printed boards for the first and second wirings for the CPU 12. Other hardware configurations and functional configurations of the second embodiment are the same as those of the first embodiment shown in FIGS.

<Third embodiment>
FIG. 8 shows an enlarged portion corresponding to the portion 6A shown in FIG. 4 of the main controller board 10b of the third embodiment. In order to provide versatility, the LSI 16 has a normal operation mode that exhibits an originally intended image processing function, and a trial mode that exhibits an alternative image processing function in which a test function inside the component and an originally intended function are changed. These functions are provided in advance, and can be switched by applying a ground potential (−) or a power supply potential (+) to the function setting terminal (32) or by opening. The function setting terminal (32) is set to the “H” level or opened to shift to the trial mode. On the other hand, when the function setting terminal is set to the “L” level, the mode is shifted to the normal operation mode. A ground (device ground) potential of the power supply circuit is applied to the inner layer wiring 33 of the main printed circuit board 10b, and a power supply potential (+) of the power supply circuit is applied to the inner layer wiring 34.

  The function setting terminal (32) of the LSI 16 mounted on the first surface 10s1 of the main printed circuit board 10b is drawn out to the second surface 10s2 by the through via 36 of the main printed circuit board 10b. Further, as shown in FIG. 8, a signal line is drawn from the first inner layer wiring 33 of the main printed circuit board 10b to the second surface 10s2 by the through via 37. Similarly, a signal line is drawn out from the wiring portion of the second inner layer wiring 34 to the second surface 10 s 2 by the through via 38. Also in this embodiment, the first inner layer wiring 33 is a ground potential, and the second inner layer wiring 34 is a power supply potential. In this embodiment, the power supply potential is drawn to the second surface 10s2 of the main printed circuit board 10b by the through via 38. The auxiliary printed circuit board 20 for wiring is supplied with the power supply potential.

  The auxiliary printed circuit board 20 for wiring mounted on the second surface 10s2 is a printed circuit board composed of a plurality of wiring layers, and is a connection that is a ball-like terminal, like the connection ball group 31 that is an external connection terminal group of the LSI 16. A ball group 41 is provided. A part of the connection ball group 41 is connected in the first auxiliary wiring board 20 for wiring. As shown in FIG. 8, when the wiring auxiliary printed circuit board 20 is mounted on the main printed circuit board 10b, the external connection terminal (via 35) of the LSI 16 drawn out to the second surface 10s2 is the wiring auxiliary printed circuit board. On the other hand, the through via 37 (normal operation mode instruction signal line) drawn from the first inner layer wiring 33 (ground layer) of the main printed circuit board 10b is similarly connected to the auxiliary printed circuit board 20 for wiring. At the same time, the through via 36 and the through via 37 (normal operation mode instruction signal line) joined to the connection ball 32 which is a function setting terminal of the main printed circuit board 10b are connected to the connection balls 42, 43,. The through-vias 46 and 47 and the internal wiring 48 are connected, and as a result, the function setting terminal (connection ball 32) is connected to the ground (33).

  The auxiliary printed circuit board 20 for wiring further includes a wiring pattern for connecting components such as another LSI 70 (for example, FPGA (Field Programmable Gate Array): programmable LSI) to the LSI 16. The through vias 62 to 64 reach the back surface of the auxiliary printed circuit board 20 for wiring, and the connection balls 71 that are connection terminals of the LSI 70 can be joined to the through vias 62 to 64.

  Thus, in the third embodiment, the wiring pattern for connecting the additional LSI 70 is provided on the auxiliary printed circuit board 20 for wiring. When a malfunction occurs in the operation of the LSI 16, the LSI 16 enters a test mode when the auxiliary printed circuit board 20 for wiring is separated from the main printed circuit board 10 b. When the LSI 70 is connected to the wiring auxiliary printed circuit board 20 while the wiring auxiliary printed circuit board 20 is connected to the main printed circuit board 10 b, the LSI 16 replaces the originally intended function according to the correction function set in the LSI 70. Works with image processing functions. That is, by mounting the LSI 70 in which the additional circuit is incorporated on the wiring auxiliary printed board, the operation of the LSI 16 can be easily corrected. Additional work (addition of circuits, etc.) that was impossible with conventional technology can be realized on the auxiliary printed circuit board 20 for wiring, so the number of days and cost of countermeasures for defects can be reduced, and efficient countermeasures can be taken. It is possible to do it. The CPU 12 used in the third embodiment is also connected to the main printed circuit board 10b in the same manner as the LSI 16, and has the same configuration corresponding to the above-described auxiliary printed circuit board 20 for wiring. There is an auxiliary printed circuit board. Other hardware configurations and functional configurations of the third embodiment are the same as those of the first embodiment shown in FIGS.

<Fourth embodiment>
FIG. 9 is an enlarged view of a portion corresponding to the portion 6A shown in FIG. 4 of the main controller board 10b of the fourth embodiment. In the fourth embodiment, a clock generation package 90, which is an LSI, is connected to an auxiliary printed circuit board 20 for wiring similar in configuration to that of the third embodiment. As in the third embodiment, the LSI 16 exhibits a normal operation mode that demonstrates the originally intended image processing function, and an alternative image processing function that changes the internal test function and the originally intended function. Each function of trial mode. In the wiring pattern of the auxiliary printed circuit board 20 for wiring, in addition to the circuit wirings 60 to 64 that connect the clock generation package 90 to the LSI 16, there are back surface printed wiring 91 that connects the clock generation package 90 and the connector 92. The back printed wiring 91 is obtained by electrically connecting a connector 92 to the clock generation package 90. The clock generation package 90 has a variable oscillation frequency, and can output one (one set) clock of a plurality of frequencies by giving frequency instruction data from the connector 92. That is, in the unlikely event that a malfunction occurs in the operation of the LSI 16, the frequency instruction data provided from the connector 92 can be changed to change the frequency of the output clock. As a result, it becomes possible to change the conditions at the time of the occurrence of the defect, so that the analysis of the defect can be facilitated.

  FIG. 10 shows an outline of the configuration of the clock generation package 90. The oscillation circuit 93 oscillates by resonating with a vibration signal of an external crystal resonator or an original clock of a predetermined frequency given from the outside, generates a clock signal of a predetermined frequency, and a PLL (Phase Locked Loop) circuit 95 and The output buffer 96 is provided with a gate function (output on / off function). The PLL circuit 95 includes a clock obtained by dividing (frequency reduction) or multiplying (frequency increase) the clock signal output from the oscillation circuit 93 and a clock obtained by further dividing the clock, and one clock group (one set of plural frequencies). Is generated for one value of the frequency designation data and is supplied to the output buffer. One clock group includes, for example, one or more CPU clocks, one or more peripheral circuit clocks, and one or more ASIC clocks. A part or all of the ASIC clock is supplied to the LCI 16, a part or all of the CPU clock is supplied to the CPU 12 through the wiring pattern of the main printed circuit board 10b, and the peripheral circuit clock is also supplied through the wiring pattern of the main printed circuit board 10b. It is given to the I / F etc. on the printed circuit board 10b. In this embodiment, for example, at least one frequency in the group is eight sets different from each other, one set is designated by 3-bit frequency instruction data, and the designated clock group is output from the PLL 95 to the output buffer. The output buffer 96 turns on (output) / off a group of clocks provided by the PLL 95 and a clock provided by the oscillation circuit 93 in response to an on / off instruction by an output control signal from the frequency controller 94. (Output stop). Note that these clocks are turned on (output) / off (output stopped) for each clock. That is, the number of output control signals is the same as the number of clocks.

  By operating (changing, switching) the frequency instruction data and control signal using an external controller (not shown) connected to the connector 92, the clock frequency is changed, or a part of the clock is turned on / off, and the main controller Ten actions can be tested or modified. In a modification of the fourth embodiment, a dip switch is used instead of the connector 92. In this case, the operation of the main controller 10 is tested by changing the on / off pattern of the dip switch to change the clock frequency, or turning on / off a part of the clock without using an external controller. It can be corrected.

  According to the fourth embodiment, when the wiring auxiliary printed circuit board 20 is separated from the main printed circuit board 10b, the LSI 16 operates in the test mode. While the auxiliary printed circuit board 20 for wiring is mounted on the main printed circuit board 10b, the frequency of the output clock of the clock generation package 90 is changed, and a part of the group of output clocks is turned on / off as necessary, thereby the LSI 16 (And the main controller 10) operate in an alternative image processing function or test mode in which the originally intended function is changed. This makes it possible to improve the efficiency of failure analysis. The CPU 12 used in the fourth embodiment is also connected to the main printed circuit board 10b in the same manner as the LSI 16, and has the same configuration corresponding to the above-described auxiliary printed circuit board 20 for wiring. There is an auxiliary printed circuit board. Other hardware configurations and functional configurations of the third embodiment are the same as those of the first embodiment shown in FIGS.

<Fifth embodiment>
FIG. 11 is an enlarged view of a portion corresponding to the portion 6A shown in FIG. 4 of the main controller board 10b of the fifth embodiment. In the fifth embodiment, the auxiliary printed circuit board 20 for wiring penetrates through the auxiliary wiring board 20 for wiring similar in configuration to the second embodiment from the back surface to the front surface through vias 65 and 66 for connecting capacitor components. The capacitor 72 can be connected to the through vias 65 and 66 on the back surface of the wiring auxiliary printed circuit board 20. The main printed circuit board 10b includes a through via 39 and a through via 40 for connecting the through vias 65 and 66 (connected to the capacitor 72) of the auxiliary wiring board 20 for wiring to the ground potential and the power supply potential. These through vias 39 and 40 are connected to the first inner layer wiring 33 and the second inner layer wiring 34 and extend to the second surface 10s2. The through vias 65 and 66 of the auxiliary printed circuit board 20 for wiring are connected to the through vias 39 and 40 of the main printed circuit board 10 b by connecting balls 67 and 68 of the auxiliary printed circuit board 20 for wiring.

  In the conventional technique, when a noise or the like is added to the power supply potential wiring of the main printed circuit board and a defect occurs in the LSI 16, a capacitor or the like is mounted in order to reduce the noise. Since there was no part, it was necessary to modify the layout of the main printed circuit board. In the present embodiment, the capacitor 72 can be mounted by taking over the inner layer wirings 33 and 34 that become the ground power and power supply potential of the main printed circuit board 10b to the back surface of the wiring auxiliary printed circuit board 20 through the through vias 39 and 40. Therefore, it is possible to easily reduce the noise of the power supply. Therefore, the days and costs for noise countermeasures can be reduced, and noise countermeasures can be efficiently performed. The CPU 12 used in the fifth embodiment is also connected to the main printed circuit board 10b in the same manner as the LSI 16, and has the same configuration corresponding to the above-described auxiliary printed circuit board 20 for wiring. There is an auxiliary printed circuit board. Other hardware configurations and functional configurations of the fifth embodiment are the same as those of the first embodiment shown in FIGS.

<Sixth embodiment>
FIG. 12 shows an enlarged view of a portion corresponding to the portion 6A shown in FIG. 4 of the main controller board 10b of the fifth embodiment. In the fifth embodiment, the wiring auxiliary printed circuit board 20 is the wiring auxiliary printed circuit board 20 having a similar configuration to that of the fifth embodiment, but the through vias 65 and 66 have auxiliary grounds for connecting an external power source. A terminal 79 and an auxiliary power terminal 80 are connected. When a trial external power source is connected to the auxiliary terminals 79 and 80 to supply power to the inner layer wirings 33 and 34, and the power supply voltage is adjusted or changed, the normal power supply circuit to be originally supplied from the inner layer wirings 33 and 34 is separated. In order to facilitate, in the sixth embodiment, the main printed circuit board 10b is provided with through vias 73 and 74 connected to the inner layer wiring 33 and through vias 75 and 76 connected to the inner layer wiring 34, which are provided on the first surface 10s1. It extends to. A ground jumper 77 and a power jumper 78 are connected to the through vias 73, 74 and 75, 76 on the first surface 10s1. The equipment ground terminal (−) and the power supply voltage terminal (+) of the normal power supply circuit that originally supplies power to the main controller 10 are connected to the ground jumper 77 and the power supply jumper 78. The external power source for trial is a power source converted from a commercial power source to DC via an AC adapter, or a storage battery.

  In this embodiment, the ground jumper 77 and the power jumper 78 connected to the normal power supply circuit are separated from the main printed circuit board 10b to cut off the power to the main printed circuit board 10b, and the auxiliary ground terminal 79 and the auxiliary power supply terminal 80 are disconnected. It is possible to connect a trial external power source to the main printed circuit board 10b, that is, the main controller 10 from the outside. If a voltage variable variable is used as the trial external power supply, the voltage supplied to the LSI 16 on the main printed circuit board 10b can be changed.

  In the unlikely event that a defect occurs in the LSI 16, the ground jumper 77 and the power jumper 78 are removed from the main printed circuit board 10b, and power is supplied from the auxiliary ground terminal 79 and the auxiliary power terminal 80 instead. Is possible. Also, by making the voltage variable, the voltage supplied to the LSI 16 can be raised and lowered, and the failure occurrence condition can be easily changed, so that failure analysis can be facilitated. That is, the failure occurrence condition can be changed, and the efficiency of failure analysis can be improved. The CPU 12 used in the sixth embodiment is also connected to the main printed circuit board 10b in the same manner as the LSI 16, and has the same configuration corresponding to the auxiliary printed circuit board 20 for wiring. There is an auxiliary printed circuit board. Other hardware configurations and functional configurations of the sixth embodiment are the same as those of the first embodiment shown in FIGS.

  The first to sixth embodiments described above can be carried out independently, and there are also embodiments in which embodiments that are not in an exclusive relationship are combined with each other and are not in an exclusive relationship. There is also an aspect in which all of the examples are combined.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an outline of a configuration of a copier having a composite function equipped with an electrical board according to a first embodiment of the present invention. It is a block diagram which shows the outline | summary of a structure of the controller 10 shown in FIG. FIG. 3 is an enlarged plan view of a main printed circuit board 10 b equipped with the controller 10 shown in FIG. 2, showing some of the main elements, and omitting the others. 3A is an enlarged plan view around the LSI 16 in FIG. 3, and FIG. 4B is an enlarged sectional view taken along line 4B-4B in FIG. 3A, and is also an enlarged sectional view taken along line 4B-4B in FIG. FIG. 5 is an enlarged cross-sectional view of the wiring auxiliary printed circuit board 20 shown in FIG. 4B separated from the main printed circuit board 10b. FIG. 5 is an enlarged view of a round enclosure 6A portion in FIG. (A) is a cross-sectional enlarged view of a part of the electrical board of the second embodiment, (b) is an enlarged cross-section of the second printed auxiliary printed circuit board 20 used in place of the first printed auxiliary printed circuit board 20 shown in (a). FIG. It is an expanded sectional view of a part of the electrical equipment substrate of the third embodiment. It is an expanded sectional view of a part of the electrical equipment substrate of the fourth embodiment. FIG. 10 is a block diagram showing a functional configuration of the clock generation package shown in FIG. 9. It is an expanded sectional view of a part of the electrical equipment substrate of the fifth embodiment. It is an expanded sectional view of a part of the electrical equipment substrate of the sixth embodiment. (A) is an enlarged plan view of a part of a conventional main printed circuit board, and (b) is a cross-sectional view taken along line 13B-13B shown in (a).

Explanation of symbols

10b: main printed circuit board 10s1: first surface 10s2: second surface 20: first wiring auxiliary printed circuit board 31: connection ball 32: external terminal connection ball 33: first inner layer wiring 34: second inner wiring 35 to 40: Through-vias 41-43: Connection balls 44: First inner layer 45: Second inner layer 46, 47: Through-vias 48: Internal wiring 50: Auxiliary printed circuit boards 51-53 for second wiring: Connection balls 54: First inner layer 55: Second inner layer 56: Through via 57: Connection ball 58: Internal wiring 59, 60: Through via 61: Internal wiring 62 to 66: Through via 67, 68: Connection ball 70: FPGA
71: Connection ball 72: Capacitors 73 to 76: Through via 77: Ground jumper 78: Power jumper 79: Auxiliary ground terminal 80: Auxiliary power terminal 90: Clock generation package 91: Printed wiring 92: Connector 93: Oscillator circuit MB: Main Printed circuit boards IC1, IC2: Integrated circuit package

Claims (18)

A main printed circuit board which is equipped with an LSI on the first surface which is a surface and in which a first wiring to which a first constant potential is applied and a second wiring to which a second constant potential is applied are sandwiched in an inner layer;
In the main printed circuit board, a terminal connection ball on the bottom surface of the LSI is bonded to one end and the through via group for LSI having the other end on the second surface side which is the back surface of the main printed circuit board, and the first or A control through via having one end connected to the second wiring and the other end on the second surface side; and
In the through via group for LSI, at the end on the second surface side of the through via joined to the connection ball of the signal terminal to which the control signal for instructing the operation of the normal operation mode or the trial mode is applied to the LSI. A first connection ball to be joined and a second connection ball to be joined to the control through via are provided on the surface, and further, the first through via to which the first connection ball is joined and the second connection ball are connected. A first auxiliary printed circuit board equipped with a second through via and a wiring connecting the first through via and the second through via;
An electrical board equipped with an LSI.   The LSI operates in a normal operation mode when a ground potential of the first wiring is applied to a signal terminal to which the control signal is applied, and whether the power supply potential of the second wiring is applied or not. 2. The electrical circuit board equipped with an LSI according to claim 1, wherein the control through via in the main printed circuit board is connected to the first wiring at one end; A main printed circuit board which is equipped with an LSI on the first surface which is a surface and in which a first wiring to which a first constant potential is applied and a second wiring to which a second constant potential is applied are sandwiched in an inner layer;
In the main printed circuit board, a terminal connection ball on the bottom surface of the LSI is bonded to one end, and the LSI through via group has the other end on the second surface side which is the back surface of the main printed circuit board. And a control first through via having the other end on the second surface side, and a control second through via having one end connected to the second wiring and the other end on the second surface side;
In the through via group for LSI, at the end on the second surface side of the through via joined to the connection ball of the signal terminal to which the control signal for instructing the operation of the normal operation mode or the trial mode is applied to the LSI. A first connection ball to be joined and a second connection ball to be joined to the control first through via are provided on the surface, and further, the first through via to which the first connection ball is joined and the second connection ball are provided. A first auxiliary printed circuit board comprising: a connected second through via; and a wiring connecting the first through via and the second through via; and
In the through via group for LSI, at the end on the second surface side of the through via joined to the connection ball of the signal terminal to which the control signal for instructing the operation of the normal operation mode or the trial mode is applied to the LSI. A first connection ball to be joined and a second connection ball to be joined to the control second through via are provided on the surface, and further, the first through via to which the first connection ball is joined and the second connection ball are provided. A second auxiliary printed circuit board equipped with a connected second through via and a wiring connecting the first through via and the second through via;
An electrical board equipped with an LSI.   The LSI operates in a normal operation mode when a ground potential of the first wiring is applied to a signal terminal to which the control signal is applied, and whether the power supply potential of the second wiring is applied or not. The electric circuit board equipped with the LSI according to claim 3, wherein the circuit board operates in a trial mode when the circuit is released.   The auxiliary printed circuit board is connected to an additional printed circuit board through which one end is connected to a connection ball on the auxiliary printed circuit board to which the LSI through via group of the main printed circuit board is joined and the other end is on the back side of the auxiliary printed circuit board. An electrical board equipped with an LSI according to claim 1, comprising a wiring including a via.   6. The electrical board equipped with an LSI according to claim 5, wherein the additional LSI is an FPGA.   The auxiliary printed circuit board has an additional frequency variable clock having one end connected to a connection ball on the auxiliary printed circuit board to which the LSI through via group of the main printed circuit board is joined and the other end on the back side of the auxiliary printed circuit board. A wiring including a through via for connecting the generation package is provided, and a control wiring for controlling the frequency of the clock generation package is connected to the back surface of the auxiliary printed circuit board on which the clock generation package is mounted, and the wiring is connected to the wiring An electrical board equipped with an LSI according to any one of claims 1 to 4, further comprising a connector or a dip switch. The main printed circuit board has one end connected to the first wiring to which a ground potential is applied and the other end on the second surface side, and one end to the second wiring to which a power supply potential is applied. Is connected to the second surface, and there is a power through via having the other end on the second surface side;
The auxiliary printed circuit board has a ground connection ball bonded to the ground through via, a power connection ball bonded to the power through via, and a ground connection in which one end is connected to the ground connection ball and the other end is on the back side of the auxiliary printed board. The electrical board equipped with an LSI according to any one of claims 1 to 7, further comprising: a via and a power connection via having one end connected to the power connection ball and the other end on the back side of the auxiliary printed circuit board.   The electrical circuit board equipped with an LSI according to claim 8, wherein the ground connection via and the power supply connection via of the auxiliary printed circuit board are bypass capacitor connection terminals.   The auxiliary printed circuit board includes an external ground terminal connected to the other end of the ground connection via of the auxiliary printed circuit board and an external power supply terminal connected to the other end of the power connection via of the auxiliary printed circuit board. 9. An electrical board equipped with an LSI according to 8. An image processing LSI that processes input image data into image data for recording that conforms to the image representation characteristics of a printer that prints an image on paper, an image I / F that outputs the image data for recording to a printer, input of image data, A CPU that is an LSI that controls image data processing by the image processing LSI and output to a printer, a RAM that reads and writes data from the CPU, and a ROM that stores an operation program for the CPU are provided on the first surface. A main printed circuit board in which a first wiring to which a first constant potential is applied and a second wiring to which a second constant potential is applied are sandwiched in an inner layer;
In the main printed circuit board, a terminal connection ball on the bottom surface of the image processing LSI is bonded to one end, and the LSI through via group having the other end on the second surface side which is the back surface of the main printed circuit board, and the first A control through via having one end connected to the first or second wiring and the other end on the second surface side; and
In the through via group for LSI, at the end on the second surface side of the through via joined to the connection ball of the signal terminal to which the control signal for instructing the operation of the normal operation mode or the trial mode is applied to the LSI. A first connection ball to be joined and a second connection ball to be joined to the control through via are provided on the surface, and further, the first through via to which the first connection ball is joined and the second connection ball are connected. A first auxiliary printed circuit board equipped with a second through via and a wiring connecting the first through via and the second through via;
An image formation control board. An image processing LSI that processes input image data into image data for recording that conforms to the image representation characteristics of a printer that prints an image on paper, an image I / F that outputs the image data for recording to a printer, input of image data, A CPU that is an LSI that controls image data processing by the image processing LSI and output to a printer, a RAM that reads and writes data from the CPU, and a ROM that stores an operation program for the CPU are provided on the first surface. A main printed circuit board in which a first wiring to which a first constant potential is applied and a second wiring to which a second constant potential is applied are sandwiched in an inner layer;
In the main printed circuit board, a CPU through-via group having a terminal connection ball on the bottom surface of the CPU joined to one end and having the other end on the second surface side which is the back surface of the main printed circuit board, and the first or A control through via having one end connected to the second wiring and the other end on the second surface side; and
At the end on the second surface side of a through via that joins a connection ball of a signal terminal to which a control signal for instructing the CPU to operate in a normal operation mode or a trial mode is applied. A first connection ball to be joined and a second connection ball to be joined to the control through via are provided on the surface, and further, the first through via to which the first connection ball is joined and the second connection ball are connected. A first auxiliary printed circuit board equipped with a second through via and a wiring connecting the first through via and the second through via;
An image formation control board. An image processing LSI that processes input image data into image data for recording that conforms to the image representation characteristics of a printer that prints an image on paper, an image I / F that outputs the image data for recording to a printer, input of image data, A CPU that is an LSI that controls image data processing by the image processing LSI and output to a printer, a RAM that reads and writes data from the CPU, and a ROM that stores an operation program for the CPU are provided on the first surface. A main printed circuit board in which a first wiring to which a first constant potential is applied and a second wiring to which a second constant potential is applied are sandwiched in an inner layer;
In the main printed circuit board, a terminal connection ball on the bottom surface of the image processing LSI is bonded to one end, and the LSI through via group having the other end on the second surface side which is the back surface of the main printed circuit board, and the first A control through via having one end connected to the first or second wiring and the other end on the second surface side;
In the through via group for LSI, at the end on the second surface side of the through via joined to the connection ball of the signal terminal to which the control signal for instructing the operation of the normal operation mode or the trial mode is applied to the LSI. A first connection ball to be joined and a second connection ball to be joined to the control through via are provided on the surface, and further, the first through via to which the first connection ball is joined and the second connection ball are connected. An LSI auxiliary printed circuit board equipped with a second through via and a wiring connecting the first through via and the second through via;
In the main printed circuit board, a terminal connection ball on the bottom surface of the CPU is joined to one end and the CPU through via group having the other end on the second surface side which is the back surface of the main printed circuit board, and the first or A control through via having one end connected to the second wiring and the other end on the second surface side; and
At the end on the second surface side of a through via that joins a connection ball of a signal terminal to which a control signal for instructing the CPU to operate in a normal operation mode or a trial mode is applied. A first connection ball to be joined and a second connection ball to be joined to the control through via are provided on the surface, and further, the first through via to which the first connection ball is joined and the second connection ball are connected. A CPU auxiliary printed circuit board equipped with a second through via and a wiring connecting the first through via and the second through via;
An image formation control board.   The image according to any one of claims 11 to 13, wherein the main printed circuit board is further provided with an extended function I / F for inputting document information provided by an external computer or a facsimile on a first surface which is a surface. Formation control board.   The image I / F has a function of inputting image data output from the document scanner; the image processing LSI corrects image reading distortion of the image data output from the document scanner and has an image in a predetermined characteristic format. The image formation control board according to claim 11, which has a function of converting data.   16. The main printed circuit board further includes an operation unit I / F for inputting / outputting operation inputs and display outputs of an operation display board on a first surface as a surface; Image formation control board.   A printer that forms an image represented by recorded image data on a sheet; and an image formation control board according to any one of claims 11 to 16, wherein the image I / F of the image formation control board includes the image I / F. Output image data for recording to the printer (9); image forming apparatus.   16. A printer that forms an image represented by recorded image data on paper; a document scanner that reads an image on a document and outputs image data representing the image; and an image formation control board according to claim 15; The image I / F of the formation control board inputs image data output from the document scanner, and outputs the recording image data to the printer; an image forming apparatus.

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