JPH0216794A - Electronic equipment - Google Patents

Abstract

PURPOSE:To realize compactness of an entire electronic equipment and to reduce noises by providing a main circuit board of an electronic equipment body approximately horizontally under an approximately central section thereof and by connecting a connector of the circuit board directly to a connector of each unit. CONSTITUTION:Main circuit boards 7, 8 of an electronic equipment body whereto units 18-24 are connected are provided horizontally below an approximately central section of the electronic equipment body. Units 18-24 are connected to at least one side edge of the right and the left of the boards 7, 8 to the front of the electronic equipment body and each of a front and rear side edges through direct connection of connectors 34, 47a, 47b, 47c, 79 of the substrates 7, 8 with connectors 33, 46a, 46b, 46c, 84 of the units 18-24. According to this constitution, compactness of the entire electronic equipment can be realized and noises can be reduced.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to electronic equipment, and particularly to electronic equipment that is used by attaching and connecting a plurality of optional circuit units or equipment units to an electronic equipment main body in a removable manner. be.

[Prior Art] In recent years, electronic typewriters have not only a printing function but also an editing function that displays input printing data and allows the operator to edit it, and outputs manually input printing data to a floppy disk device. A device has been developed that has the function of recording on a disk, and can also add a spell check function to check the spelling of input printed data and an interface function to interface with a personal computer.

Display devices, floppy disk drives (FDD) devices, memory circuits, interface circuits, and the like that realize these functions are selected by the user according to the application, and are added later as options.

Recently, a configuration has been developed in which each of these optional devices and circuits are housed in a single case and made into a unit, allowing the user to easily install and connect them to the electronic typewriter body without using tools. has been done. FIGS. 13 and 14 show a structure for mounting conventional optional equipment units and circuit units in such an electronic typewriter, and a structure for noise shielding.
It is shown and explained in the figure.

In FIGS. 13 and 14, reference numeral 102 is an upper case, and 103 is a lower case. The upper case 102 and the lower case 103 are combined to form an exterior case of the main body of the electronic typewriter. At the rear ends of the upper case 102 and the lower case 103, a rear cover 110 connects claws 117 and 118 to the upper case 1.
02, it can be detachably attached by engaging the lower case 103 in a detachable manner. By pressing downward on the portion of the back cover 110 near the claw 117, the engagement between the claw 117 and the upper case 102 is released, and the back surface M11
0 can be removed.

The main body of the electronic typewriter, whose exterior case is composed of an upper case 102, a lower case 103, and a back cover 110, includes a keyboard 105, a printer section 106, a transformer 107 for power supply, a power supply board 108 provided with a power supply circuit, and a CPU. A CPU board 109, which is a main circuit board, is provided with a control circuit for controlling the entire electronic typewriter including a central processing unit (central processing unit).

In this type of electronic typewriter, the CPU board 109 is provided at the rear of the electronic typewriter body, and the back N110
It is fixed vertically with screws 116. CPU
The substrate 109 is designed to be removable together with the rear cover 110 for easy checking on the production line and maintenance in the market. A power supply board 108, a keyboard 105, and a printer unit 106 are connected to this CPU board 109 via cables 113 to 115, respectively.

Further, a shield plate 112 for shielding noise from the CPU board 109 is provided on the inner surface of the rear surface M110. The shield plate 112 is provided with a spring portion 119, and the spring portion 119 presses against a bent portion cut and raised at the end of the shield plate 111 with the back cover 110 attached, so that the shield plate 112 is connected to the shield plate 111 to obtain a shielding effect. Note that a ground wire pattern (not shown) of the CPU board 109 is connected to the shield plate 112.

For the above-mentioned electronic typewriter main body, here, 4 shown by the reference numeral 122.150.1601134 in FIG.
Two circuit units are detachably attached externally to the back surface of the back surface M110, and are connected to connectors 1208 to 120d provided on the CPU board 109.

Furthermore, an LCD module unit 132, which is a unit of the display main body consisting of an LCD, is detachably provided at the front of the electronic typewriter main body. These mounting structures and noise shielding structures will be explained below.

The mounting and noise shielding structure of each circuit unit is the same, and herein the mounting and noise shielding structure will be explained using a unit designated by reference numeral 122 as an interface unit for interfacing with a personal computer.

The interface unit 122 includes a board 125 on which a circuit is mounted, cases 123 and 124, and a shield plate 126 for shielding noise. The board 125 has a connector 1 for connection with the CPU board 109.
29 and a connector 130 for connection with a personal computer. When installing the interface unit 122, the blind plate 12 fitted into the part of the rear surface M110 facing the connector 120a
1 is removed. and interface unit 1
A claw 12 protruding from the inside of the lower end of the case 123 of 22
8 to the lower end of the back cover 110, and
is connected to the connector 120a, and the locking claw 127 provided at the upper end of the case 123 is connected to the back cover 110.
The interface unit 122 is mounted on the back cover 110 by engaging the upper end of the interface unit 122 . With the shield plate 126 mounted in this manner, the spring portion 131 provided on the shield plate 126 comes into pressure contact with the shield plate 112 on the rear Mito through the holes formed in the case 126 and the rear cover 110, and the shield plate 126 contacts the shield plate 112. It is connected to provide a shielding effect.

The mounting structure and noise shielding structure of other circuit units are the same as above. Note that among the circuit units, reference numeral 134 is an LCD control unit which is a unitized control circuit for controlling the LCD module unit 132, and is connected to the LCD module unit 132 via a cable 141. Next, the mounting of the LCD module unit 132 and the noise shielding structure will be explained.

In the structure of the LCD module unit 132 shown in FIG.
It is configured to cover the outside of the LCD unit 1
32, the decorative plate 136 attached to the portion of the upper case 102 into which the LCD unit 132 is fitted is removed, as shown in the upper side of FIG. LCD
The unit 132 is fitted into the illustrated position, and the connector 139 of the LCD unit 132 is coupled to the connector 140 of the connection cable 141. By fitting the LCD unit 132 into the illustrated position, the claws 137 protruding from the lower case 103 engage with the chassis 135, and the LCD unit 132 is held. Further, a spring portion 142 formed at the left end of the shield plate 111 in the drawing is pressed against the chassis 135, and the chassis 135 is connected to the shield plate 111, so that a shielding effect can be obtained. By fitting and attaching the display panel 131 to the upper case 102, the LCD unit 132 is fixed and attached. Note that a cable 141 provided with a connector 140 for connecting the LCD module unit 132 to the LCD control unit 134 is connected to the lower case 103.
It is pre-installed on the top.

With the above-described structure, each unit can be attached and detached without using any tools, and the shield plates are connected to each other by pressure contact using the spring portion, so that a shielding effect can be obtained.

[Problems to be Solved by the Invention] However, the conventional structure described above has the following drawbacks.

a) Keyboard 105 and printer unit 106 and CPt
Cables 114 and 115 for connecting the J board 109
This increases the length of time, increases costs, and is disadvantageous in terms of noise generation.

b) Each circuit unit requires an external case and a shield plate, which increases costs.

C) The shield plates are connected to each other through pressure welding of the spring parts, and the shield plate of the circuit unit is connected to the CPU.
Since it is connected to the shield plate 111 of the main body via the shield plate 112 for the substrate 109, the connection becomes uncertain and the shielding effect becomes uncertain.

d) Since the CPU board 109 is provided at the rear of the main body of the electronic typewriter, and the circuit unit is provided externally at the rear thereof, the overall depth of the electronic typewriter becomes long. The electronic typewriter occupies a large area on the desk, causing problems such as protruding from the depth of the desk.

e) Since the LCD (liquid crystal display) module unit 132 and the LCD control unit 134 are provided separately, a cable 141 for connecting them must be provided in the typewriter body in advance. The cost will increase accordingly. When attempting to attach the cable 141 to the unit, the attachment deviates from the scope of work that can be easily performed by the user's hands. Also, as shown in Figure 14, the LCD
The control unit and cable 141 are relayed via the CPU board 109, and it can be said that the relay pattern is wasted for the CPU board 109. Also, as shown in the figure, the connector 120d, CPU board 109 and cable 1
Since the cable 141 is relayed to three stages and the cable 141 is long, it is very disadvantageous in terms of noise generation.

The above-mentioned problems are not limited to electronic typewriters, but are also common to other electronic devices in which a plurality of optional circuit units or device units are removably attached to and connected to the main body of the electronic device.

Therefore, an object of the present invention is to provide a structure that can further reduce the cost of this type of electronic equipment, reduce the size of the entire electronic equipment, reduce costs, and further reduce noise generation and improve the shielding effect. It's about doing.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides an electronic device in which a plurality of optional circuit units or device units are removably attached to and connected to an electronic device main body. A main circuit board of the electronic device main body to which the unit is connected is provided almost horizontally at the bottom of the center of the electronic device main body, and at least one of the right and left side edges of the circuit board when facing the front of the electronic device main body. A structure is adopted in which each unit is connected and attached to each of the front and rear side edges by directly connecting the connector of the circuit board and the connector of each unit.

Further, according to the present invention, in an electronic device in which a plurality of optional circuit units or device units are detachably attached to and connected to an electronic device main body, a noise shielding plate provided in the electronic device main body is By fixing the chassis that also serves as a noise shielding shield plate of the unit with a conductive fixing member, the unit is fixed and the chassis is connected to the shield plate in the electronic device main body via the fixing member. We adopted a structure that allows for

[Function] According to the former structure described above, multiple optional circuit units or device units are installed on at least one of the right and left sides of the electronic device in addition to the front and rear of the main body of the electronic device. The depth of the entire electronic device can be made smaller than before. Furthermore, since each unit is connected by direct coupling between the connector of the circuit board and each unit, noise generation can be reduced more than when connecting in multiple stages.

Furthermore, according to the latter structure mentioned above, it is possible to easily fix the unit and connect the shield plate at the same time, and the chassis, which is the shield plate of the unit, is securely attached to the shield plate of the electronic device body through the conductive fixing member. is connected to ensure a shielding effect.

[Embodiments] Details of embodiments of the present invention will be described below with reference to the attached drawings.

FIGS. 1 to 12 show the mounting structure of each unit and the structure related to noise shielding of an electronic typewriter that is used by detachably mounting and connecting a plurality of optional circuit units and equipment units as an embodiment of the present invention. This is to explain.

The electronic typewriter of this embodiment has an LCD unit 22 shown in FIG. 5(A) as an optional display device, or a CRT (cathode ray tube, so-called cathode ray tube) monitor unit 23 shown in FIG. C consisting of a CRT control unit 24 which is a control circuit unit.
It is assumed that the RT display device is selectively installed and used. Further, as an option, an FDD (floppy disk drive) unit 18 shown in FIG. 6(A) is used.

Furthermore, as an optional circuit unit, Fig. 7 (A)
an interface unit designated by 19 and 21;
It is assumed that the function unit shown by 2 and the spell checker unit shown by 20 in FIG. 2(B) can be selectively installed. The functions of each unit are as described above in the conventional example.

First, the structure of the electronic typewriter main body will be explained with reference to FIGS. 1 to 4. Figure 1 shows the structure inside the main body of the electronic typewriter, Figures 2 (A) and (B) show the connection relationship of each part inside the main body, and Figures 3 (A) to (C) show the lower case of the main body. FIG. 4 shows the overall appearance of the electronic typewriter body.

In these figures, reference numeral 1 indicates an upper case, and reference numeral 2 indicates a lower case, and the upper case 1 and lower case 2 are combined to form an exterior case of the main body of the electronic typewriter. The back cover of the conventional example is not provided. A hood 3 is provided on the upper case 1 so as to be openable and closable.

Further, a shield plate 10 is provided on the inner surface of the lower case 2 for shielding noise from the entire electronic typewriter body. The main body of the electronic typewriter is mainly composed of a keyboard 4 for manual operation, a printer section 5 for recording, a power supply board 7 equipped with a transformer 6 and 7 source circuit for power supply, and a CPU for controlling the entire main body of the electronic typewriter. CPU board 8 which is the main circuit board provided with the control circuit
is provided.

As shown in FIG. 1 and FIG. 3(C), a CPU board storage area is provided in the center of the lower surface of the lower case 2, which is formed as a recess to provide a space for storing the CPU board 8. . In order to attach the CPU board 8, an L-shaped CPU board mounting part 14 is cut out and formed on the shield plate 10, and this mounting part 14 is inserted through a hole formed in the lower case 2. It faces into the CPU board storage section A. This CPU board installation is done by tightening the CPU board 8 to the part 14 with the screws 15.
The CPU board 8 is fixed inside the storage part A. CPU board 8
The ground wire pattern of the circuit (not shown) is pressed into contact with the CPU board mounting portion 14 and connected to the shield plate 10.

In contrast to the CPU board 8 provided in this way, the power supply board 7
, the keyboard 4, and the printer unit 5 are each connected to the cable 1.
1 to 13.

The respective grounds of the keyboard 4, printer section 5, and power supply board 7 are connected to a shield plate 10.

Further, a lid 9 is detachably provided on the lower surface of the lower case 2, as shown in FIG. The lid 9 also serves as a shield plate,
It is fixed by tightening screws 17 to a cylindrical screw portion 16 protruding from the shield plate 10, and
It is connected to the shield plate 10 by pressure contact with the threaded part 16,
A shield effect can be obtained.

In the structure of the electronic typewriter body described above, Figure 3 (
As shown in A) and (C), on the lower surface of the lower case 2, on the right side of the center when facing from the front of the electronic typewriter body, there is an FD as a recess for storing the FDD unit.
A D unit storage compartment is formed. This FDD unit storage type DD unit 18 is stored and installed, and as shown in FIG. The FDD unit 18 is connected to the CPU board 8 by directly coupling the connector 33 of the FDD unit 18 to the connector 34 . Further, as shown in FIGS. 3(A) to 3(C), an interface unit storage area C is provided at the rear of the lower case 2 as a recess for storing the circuit unit.
1 spell checker unit storage section D1 function unit storage section E is formed. Each circuit unit is then stored in these storage areas and installed, as shown in Figure 2 (B).
As shown in FIG.
Each unit 19-21 is connected to the CPU board 8 by directly connecting the connectors 46a-46c of 9-21. Further, as shown in FIG. 2(B), an LCD unit 22 or a CRT control unit 24 is attached to the front part of the main body of the electronic device, and the respective connectors 73
The LCD unit 22 or the CRT control unit 24 is connected to the CPU board 8 by directly connecting the connector 79 to a connector (not shown) of the CPU board 8. Note that the CRT control unit 24
Connector 84, cable 80, connector 89.99
and CRT monitor unit 23 via cable 98
is connected. The mounting structure of each of the above units and the structure related to noise shielding will be explained below.

First, the structure related to the FDD unit 18 is shown in Figure 6 (A) ~
It is shown and explained in (D).

As shown in FIGS. 6(B) and 6(C), a bottom plate 25 which also serves as a shield plate is fixed to the lower case 2 at the bottom of the FDD unit storage compartment.

There is a lid 26 at the bottom entrance of the FDD unit storage compartment to close it.
can be detachably attached by engaging claws 27 and 28 in holes 201 formed in the lower case 2 and holes formed in the bottom plate 25 in a detachable manner. i2
6 can be removed by opening the hood 3 and pushing down the claw 27 to disengage it from the hole 201. After removing M26 in this manner, the FDD unit 18 is inserted into the bottom of the FDD unit housing and installed.

When the FDD unit 18 is installed, the state shown in Fig. 6 (C
), the entire FDD unit 18 is housed in the FDD housing part B, and only the front panel 30 of the FDD unit 18 is exposed. The FDD unit 18 is not provided with an exterior case, and a chassis 29 that also serves as a shield plate is exposed on the entire outer surface of the FDD unit 18 on the rear side from the front panel 30. A fixing part 291 is provided on the upper edge of the front end of the chassis 29.
is bent into an L shape and cut up. This fixing part 291 has a coin screw 3 having a groove 311 in its head into which a coin can be fitted, as shown in FIG. 6(D).
1 is inserted, and the coin screw 31 is attached to the fixing portion 291 by attaching the E ring 32 to the threaded portion 36 of the coin screw 31. Further, a hole 202 for passing the coin screw 31 is formed in a portion of the lower case 2 where the fixing portion 291 of the chassis 29 comes into contact. Further, the shield plate 10 has an L-shaped mounting portion 35 provided with a screw hole into which a coin screw 31 is screwed.

When installing the FDD unit 18 based on such a structure, the FDD unit 18 is inserted into the bottom of the FDD unit storage compartment, the connector 33 of the FDD unit 18 is connected to the connector 34 of the CPU board 8, and the coin screw 3
1 through the hole 202 to attach the shield plate 10 to the part 35.
By screwing into the screw hole of the chassis 2 and tightening it,
9 is fixed to the shield plate 10, and the FDD unit 18 is fixed. Moreover, by using the coin screw 31 made of a conductive material, the chassis 29
is connected to the shield plate 10 via the coin screw 31, so that a shielding effect can be obtained.

Next, the structure related to the interface unit 19 is
This will be explained with reference to Figures (A) to (C).

As shown in FIGS. 7(A) and 7(C), the M2S can be detachably attached to the entrance/exit of the interface unit storage section C provided in the lower case 2. The lid 38 has claws 39 formed on its upper and lower edges.
．． 4o is engaged with an engaging portion formed on the lower case 2. When the lid 38 is pushed down, the claws 39 are bent and disengaged from the lower case, allowing the lid 38 to be removed. The interface unit 19 is installed and attached by removing this 3ii (38).

The structure of the interface unit 19 is shown in FIG. 7(B).
The upper part of the outer shell of the case 41 is a molded product.
The lower part and the front are composed of a chassis 42 which also serves as a shield plate. On the upper edge of the front part of the chassis 42, as in the case of the FDD unit 18,
A fixed portion 421 bent into an L-shape is formed. A coin screw 43 similar to that described above is inserted into the fixing portion 421 and attached via an E-ring 44.

On the other hand, a shield plate 37 for shielding noise from the power supply board 7 is provided above the interface unit storage part C in the lower case 2, and is fixed by tightening to the shield plate 10 with screws 371. , are connected to the shield plate 10 in pressure contact. A hole 203 through which a coin screw 43 is inserted is formed in a portion of the lower case 2 that is in contact with the fixing portion 421 of the chassis 42 . The shield plate 37 has an L-shaped mounting portion 50 having a screw hole opposite to the hole 203 into which a coin screw 43 is screwed.

When installing the interface unit 19, insert the interface unit 19 into the interface unit housing C, and connect the connector 46a provided on the circuit board 45 of the interface unit 19 to the CPU.
It is coupled and connected to the connector 47a of the board 8. Then, pass the coin screw 43 through the hole 203 and insert the coin screw 43 into the shield plate 37.
The fixing part 421 of the chassis 42 is fixed to the shield plate 37 by screwing and tightening the screw part 51 into the part 50, and the interface unit 19 is fixed. Further, as described above, by making the coin screw 43 conductive, the interface unit 19
The chassis 42 is connected to the shield plate 37 via a coin screw 43, and further connected to the shield plate 10 of the main body via this shield plate 37. Note that when the interface unit 19 is attached, the bottom inner part of the chassis 42 is pressed against the aforementioned lid 9 which also serves as a shield plate, and is also connected to this M9.

After the interface unit 19 is installed in this manner, the connector 49a of the cable 49 for connection to an external personal computer or the like is connected to the external connection connector 48 provided on the circuit board 45 of the unit. This allows the interface unit 19 to be connected to an external personal computer or the like. Even if a force is applied to the cable 49, the interface unit 19 is secured to the shield plate 37 by the coin screw 43.
It is firmly fixed, so it will not fall out.

Next, the structure related to the spell checker unit 2o is the same as that of the interface unit 19, so the explanation thereof will be omitted, and the structure related to the function unit 21 will be explained.

As shown in FIGS. 7(A) and 8, a lid 52 is detachably attached to the entrance/exit of the function unit storage section E of the lower case 2. As shown in FIG. The lid 52 is formed with claws 521.522, and the claws 521.5
i52 is attached to the lower case by engaging 22 with the lower case. By pushing down MB2, the claw 521 is bent and disengaged from the lower case 2, allowing the lid 52 to be removed.

On the other hand, the structure of the function unit 21 is shown in FIG. 8. The upper part of the outer shell of the unit is formed from a case 251 which is a molded product, and the lower part and front part are made of a chassis that also serves as a shield plate. It consists of 54. At the upper edge of the front part of the chassis 54, there is an L
A letter-shaped bent portion 541 is continuously formed.

When installing the function unit 21, first attach the lid 52.
, insert the function unit 21 into the function unit storage part, connect the connector 46c provided on the circuit board 212 of the function unit 21 to the connector 47c of the CPU board 8,
Connect. Furthermore, the claws 521 and 522 of the lid 52 are engaged with the lower case 2 to attach the i52. A bent portion 54 of the chassis 54 is formed by a rib 53 protruding from the inner surface of the lid 52.
1 is pressed, which causes the function unit 21
is fixed.

Next, the structure related to the LCD unit 22 will be explained.

As shown in FIG. 9, the upper case 1 has an LCD unit 22.
A unit mounting portion F is formed as a recess into which (or the CRT control unit 24) is mounted. When the LCD unit 22 (or CRT control unit 24) is not mounted on the unit mounting portion F, the decorative panel 55 is mounted on the unit mounting portion F as shown in FIG. As shown in FIG. 1, a coin screw 57 is attached via an E-ring 58 to arm portions 551, 551 protruding from both ends of the upper edge of the decorative panel 55. Further, an insert screw 59 is fixed to the upper case 2. The decorative panel 55 is fitted into the upper case 2 as shown in FIG. By screwing the threaded portion 60 of the screw 57 into the insert screw 59 and tightening, the decorative panel 5
5 is fixed to the upper case 1. By removing the coin screw 57 from the insert screw 59, the decorative panel 55 can be easily pulled out from the upper case 1. In this way, the decorative panel 55 is removed and the LCD unit 22 is attached.

The structure of the LCD unit 22 is as shown in FIG. 10(A). As shown in the figure, the LCD unit 22 includes a case 61, a chassis 63 that also serves as a shield plate fixed to the case 61 with screws 69, an LCD board 64 fixed to the chassis 63 with screws 65, and a case 61. It consists of an LCD module 62, which is an LCD main body attached to the LCD module 62. A control circuit for controlling the LCD module 62 is provided on the LCD substrate 64. L.C.
The D module 62 and the LCD board 64 are connected to the connector 66
, a cable 68, and a connector 67. A connector 73 for connecting to the CPU board 8 is provided on the LCD board 64. Also LCD unit 2
2 to the upper case 1, as shown in FIG.
As shown in FIG. 10(B), a coin screw 70 is inserted through the coin 1 and attached via an E-ring 71.

When installing the LCD unit 22, first remove the decorative panel 55 from the upper case 1 as described above, and attach the LCD unit 22 to the unit installation part F of the upper case 1 in FIG.
), and connect the connector 73 of the LCD unit 22 to the connector 74 of the CPU board 8 for connection.

Then, as shown in FIG. 10(B), the threaded portion 72 of the coin screw 70 is inserted into the insert screw 5 fixed to the upper case 2.
9 and tightening the coin screw 7o, the LCD unit 22 is fixed to the upper case 2.

As shown in FIG. 10(C), a spring portion 75 is formed in the shield plate 10 in the main body of the electronic typewriter by being bent and cut into a rectangular shape, and this spring portion 75 is When the unit 22 is installed in the position shown in FIG. 1A, it comes into pressure contact with the chassis 63 of the LCD unit 22.

This connects the chassis 63 to the shield plate 10,
A shield effect can be obtained.

Next, the structure related to the LCD unit 22, the CRT control unit 24 and the CRT monitor unit 23 which are selectively mounted will be explained.

The structure of the CRT control unit 24 is shown in Figure 11 (A
) as shown. The CRT control unit 24 includes a case 76, a chassis 77 which also serves as a shield plate fixed to the case 76 with screws, and a CRT monitor substrate 78 fixed to the case with screws. A control circuit for the CRT monitor unit 23 is provided on the CRT monitor substrate 78 . Also, CRT monitor substrate 78C
A connector 79 for connecting to the PU board 8 and a connector 84 for connecting to the CRT monitor unit 23
is provided.

The mounting structure of the CRT control unit 24 and the connection structure for noise shielding are similar to the structure of the LCD unit 22 described above. When installing the CRT control unit 24, the above-mentioned decorative panel 5
5 from the unit storage part F of upper case 1, and
Fit the T control unit 24 into the unit storage part F, connect the connector 79 to the connector 74 of the CPU board 8, and connect the connector 84 to the lower case 2.
It is coupled and connected to the connector 81 provided above. Similarly to the case of the LCD unit 22, the CRT control unit 24 is fixed by fixing the case 76 to the upper case 1 with a coin screw (not shown). In addition, with the CRT control unit 24 installed, a spring portion (not shown) of the shield plate 1o of the electronic typewriter main body comes into pressure contact with the chassis 77 of the CRT control unit 24, thereby connecting the chassis 77 to the shield plate 10 and shielding. It's starting to take effect.

The CRT monitor unit 23 connected to the CRT control unit 24 mounted as described above is installed outside the main body of the electronic typewriter as shown in FIG. 2(B). Below are the CRT control unit 22 and CR
The structure for connecting the T monitor unit 23 will be explained.

In order to connect both the units 23 and 24 mentioned above, please refer to Fig. 2 (
As shown in B), a cable 8o is provided on the lower case 2 in advance. At one end of the cable 8o is the CRT mentioned above.
A connector 81 to which a connector 84 of the control unit 24 is connected is provided as shown in FIG. 12(A). The connector 81 is a boss 83 protruding from the lower case 2.
It is fixedly provided with screws 82 to the other end. The end portion of the cable 8o connected to the connector 81 has its sheath removed, and a shielding net 85 that shields each lead wire of the cable 8o is exposed. Then, at the exposed part of the shield net 85, the cable 80 is pressed against the cable attachment part 86 provided on the shield plate 1o of the main body of the electronic typewriter with a metal fitting 87, and the metal fitting 87 is connected to the cable attachment part with a screw 88. By fixing it to 86, the cable 8
0 is fixed to the shield plate 1o.

The shield net 85 of the cable 80 is pressed into contact with the cable mounting portion 86 of the shield plate 1° and is connected, thereby obtaining a shielding effect.

On the other hand, the other end of the cable 80 is connected to a connector 89 provided at the rear left corner of the main body of the electronic typewriter, as shown in FIG. 2(B).

As shown in FIG. 12(B), the connector 89 is fixed to the shield plate 10 in the main body of the electronic typewriter with a conductive screw 93. Fixed. Also, at the 8° end of the cable connected to the connector 89, the shielding net 94 is exposed like the other end, and the cable installation where the shielding net 94 part is provided at 1° of the shielding plate is attached to the part 95. By fixing the metal fittings 96 to the cable attachment portion 95 with screws 97, the shield net 94 portion is pressed against and fixed to the shield plate 10. The shield net 94 is connected to the shield plate 10 by pressure welding, thereby obtaining a shielding effect.

A connector 99 of a cable 98 connected to the CRT monitor unit 23 is connected to this connector 89 as shown in FIG. 11(B). In order to securely fix the connector 99 to the connector 89,
A screw hole is cut in the head of the screw 90 on the connector 89 side. and screw 1oo through the flange of connector 99.
By tightening the connector 99 into the screw hole of the screw 90, the connector 99 is firmly fixed. That is, even if force is applied to the cable 98, the connector 99 will not come off.

As described above, the connectors 84 and 81, the cable 80,
CR via connector 89.99 and cable 98
The T control unit 24 and the CRT monitor unit 23 are connected. Although the connectors 89 and 99 can be touched from the outside, they are connected to a shield plate and grounded via a conductive metal fitting 91 to allow static electricity to escape. Note that the CRT monitor unit 23 and CRT control unit 24 are not provided, and the CRT
When the connector 99 of the cable 98 of the monitor unit 23 is not connected to the connector 89, as shown in FIG. , 102b can be engaged with the lower case 2 and detachably attached.

According to this embodiment as described above, the CPU board 8 is provided horizontally at the lower part of the approximately central part of the main body of the electronic typewriter.
Connectors for connecting each unit are provided on the right, front, and rear side edges of the CPU board 8 when facing the front of the electronic typewriter body, and the connectors of each unit are directly connected to the respective connectors. Since each unit is mounted in the electronic typewriter, the depth and width of the entire electronic typewriter are not increased, and the overall size of the electronic typewriter can be reduced. That is, compared to an electronic typewriter configured not to be equipped with an optional unit, the height and height are increased to some extent, but the depth and width are not significantly increased.

Furthermore, by locating the CPU board 8 almost in the center of the electronic typewriter body, the length of the cable for connecting the CPU board 8 to each part of the electronic typewriter such as the keyboard 4 and printer section 5 can be shortened, reducing costs. It is possible to reduce noise generation as well.

Moreover, since each unit is connected to the CPU board 8 by direct coupling of connectors to each other without using cables, it is possible to reduce costs by not using cables, and to similarly reduce noise generation.

Furthermore, FDD unit 18, interface unit 1
9 and the spell checker unit 22, their respective chassis that also serve as shield plates are fixed to the shield plates 10 to 37 inside the electronic typewriter body with conductive coin screws, and each chassis is fixed with conductive coin screws. Since it is connected to the shield plates 10 to 37 through the connector, the connection can be made more securely than if the connection is made by press-fitting the spring portion, and the shielding effect can be ensured.

In addition, each optional unit has a chassis that also serves as a shield plate exposed to the outside, but when each unit is installed, almost the entire unit is stored in the electronic typewriter body and the chassis is no longer visible, so for example There is no problem even if the chassis is made of an unsightly steel plate or the like. Also, since the chassis also serves as a shield plate and no external case is provided on the exposed part of the chassis,
The number of parts in each unit is reduced, leading to cost reductions.

Furthermore, each optional unit can be easily installed by removing the decorative plate, inserting each unit into the unit storage section or mounting section, and fixing it by turning the coin screw.

It goes without saying that the above-described structure related to the installation and connection of optional units is not limited to electronic typewriters, but can also be applied to other electronic devices such as word processors and personal computers that are used with optional units installed and connected. It is.

[Effects of the Invention] As is clear from the above description, according to the present invention, in an electronic device that is used by attaching and connecting a plurality of optional circuit units or device units to an electronic device main body in a detachable manner, the units are connected. The main circuit board of the main body of the electronic device is installed almost horizontally at the bottom of the center of the main body of the electronic device, and at least one of the right and left side edges and the front side of the circuit board when facing the front of the main body of the electronic device. A structure is adopted in which each unit is connected and attached to each of the rear side edges by direct coupling of the connector of the circuit board and the connector of each unit, so that the entire electronic device can be miniaturized. At the same time, it is possible to reduce costs by not using cables to connect optional units, and to reduce noise generation.

Further, according to the present invention, in an electronic device in which a plurality of optional circuit units or device units are detachably attached to and connected to an electronic device main body, a noise shielding plate provided in the electronic device main body is By fixing the chassis that also serves as a noise shielding shield plate of the unit with a conductive fixing member, the unit is fixed and the chassis is connected to the shield plate in the electronic device main body via the fixing member. By adopting a structure that allows each unit to be connected securely to the shield plate inside the electronic device, the shielding effect is reliably obtained, and the number of parts in each unit is reduced.
An excellent effect of cost reduction can be obtained.

[Brief explanation of the drawing]

Figures 1 to 12 (A) and (B) explain the installation and connection structure of an optional unit in an electronic typewriter according to an embodiment of the present invention, and Figure 1 shows the entire side of the electronic typewriter. 2 (A) and (B) are respectively plan views showing the internal arrangement and connection relationships of each part in the main body of the electronic typewriter and each optional unit, and Figures 3 (A) to (C) are respectively sectional views. A perspective view of the lower case seen from different directions, Figure 4 is a perspective view showing the external appearance of the electronic typewriter without the optional equipment unit installed, and Figures 5 (A) and (B) show different options. Figures 6(A) to 6(D) are perspective views showing the external appearance of the electronic typewriter with the unit and unit installed, respectively.
Explanatory diagram of unit installation and connection structure, Figure 7 (A)
~(C) are explanatory diagrams of the mounting and connection structure of the interface unit, FIG. 8 is a side sectional view showing the mounting and connection structure of the function unit, and FIG. 9 is a perspective view of the upper case, LCD unit, and decorative panel. 1st
0 (A) to (C) are explanatory diagrams of the mounting and connection structure of the LCD unit, respectively, FIGS. 11 (A) to (C) are explanatory diagrams of the mounting and connection structure of the CRT control unit, respectively, and FIG. A) and (B) are perspective views showing the respective peripheries of the connectors at both ends of the CRT relay cable, and FIG. 13 is a side sectional view of a conventional electronic typewriter.
FIG. 14 is a plan view showing the arrangement and connection relationship of various parts and optional units in a conventional electronic typewriter. 1... Upper case 2... Lower case 3... Hood 4... Keyboard 5... Printer part 6... Transformer 7... Power supply board 8
...CPU board 9...Lid 10.37
...Shield plate 11-13.49.68.80.98
... Cable 18 ... FDD unit 19 ... Interface unit 20 ... Spell checker unit 21 ... Function unit 22 ... LCD unit 23 ... CRT monitor unit 24 ... CRT control unit 29 .42.5
4.63.77...Chassis 31143.57.70
... Coin screw 55 ... Decorative panel

Claims (1)

[Claims] 1) In an electronic device that uses a plurality of optional circuit units or device units that are removably attached to and connected to an electronic device main body, the main circuit board of the electronic device main body to which the units are connected is The circuit board is provided substantially horizontally at the bottom of the center of the main body of the electronic device, and is provided on at least one of the right and left side edges and the front and rear side edges of the circuit board when facing the front of the main body of the electronic device. An electronic device characterized in that each unit is connected and installed by direct coupling between a connector of the circuit board and a connector of each unit. 2) In an electronic device that uses multiple optional circuit units or device units that are removably attached to and connected to the electronic device main body, the noise shielding of the unit is compared to the noise shielding shield plate provided in the electronic device main body. By fixing the chassis that also serves as a shield plate for electronic equipment with a conductive fixing member, the unit is fixed and the chassis is connected to the shield plate in the main body of the electronic device via the fixing member. An electronic device featuring: 3) The unit is configured such that the chassis is exposed to the outside of the unit, and when the unit is attached to the electronic device main body, almost the entire unit is housed in the electronic device main body. An electronic device according to claim 2.