JPH09245985A - Antistatic structure of operation panel - Google Patents

Abstract

The present invention is an antistatic structure for an operation panel, which prevents the circuit board from malfunctioning by jumping from the front surface of the operation panel cover to the circuit board. According to the present invention, in an electronic device including an operation panel having a liquid crystal display unit, a top surface and a side surface of a liquid crystal display unit configured by the liquid crystal display unit and a circuit board for driving the liquid crystal display unit are molded. The LCD cover configured in (3) is fitted in the opening of the operation panel cover so that static electricity is less likely to fly from the front surface of the operation panel to the circuit board.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device equipped with an operation panel for displaying a liquid crystal display, which prevents static electricity from the surface of the operation panel from jumping to the circuit board of the liquid crystal display section and causing malfunction. Regarding prevention structure.

[0002]

2. Description of the Related Art Recently, electronic devices for performing various information processing have been developed with the development of information processing systems. These electronic devices are usually provided with various keys and an operation panel for informing the user of the device status or operation procedure. A liquid crystal display device is used for this operation panel to visually recognize the state of various keys and devices.

As shown in FIG. 10, an operation panel portion of a conventional electronic device equipped with such a liquid crystal display device is covered with a large panel cover 102 formed by molding in a panel hole of an electronic device body 101. ing. The electric circuit board 1 is provided in the operation panel portion inside the panel cover 102.
03, various keys 10 are provided on the electric circuit board 103.
4 and the light emitting diode 105 are provided. The light from the light emitting diode 105 is visible to the user through the panel cover 102, and the button portion of the key 104 is exposed to the outside of the operation panel portion through the hole of the panel cover 102. Operation is possible.

A liquid crystal display device is provided as a liquid crystal display unit 106 inside the operation panel portion inside the panel cover 102, and the liquid crystal display unit 106 is the liquid crystal display portion 10.
6a and a circuit board 106 for driving the liquid crystal display unit 106a
b and a driving IC 106c.

[0005]

Such a liquid crystal display unit 106 is susceptible to static electricity and may malfunction. That is, when the key 104 of the operation panel unit of the conventional electronic device is operated, or the liquid crystal display unit 10 is operated.
When the panel cover 102 is touched when viewing the display state of 6a, the static electricity accumulated in the user's hand is scattered between the panel cover 102 and the electronic device main body 101 to the circuit board 106b, and the liquid crystal display unit 106a. The display of was wrong, and there was a risk of making an incorrect display.

For this reason, as a measure against static electricity in the operation panel of the conventional electronic equipment, the panel cover 102 is made up of one large molded component while the design surface is slightly sacrificed, and the liquid crystal display unit 106 is attached to the panel cover 1.
02 from the end position to the center, and the distance from the end of the panel cover 102 to the circuit board 106b is increased to prevent static electricity from the panel cover 102 to the circuit board 106b.
It was hard to fly to. For this reason, the operation panel is unbalanced in design from the viewpoint of the entire electronic device, the panel cover 102 becomes large, which causes an increase in cost, and the mounting position of the liquid crystal display unit 106 is restricted. there were.

An object of the present invention is to solve the above-mentioned drawbacks, and to provide an antistatic structure for an operation panel in which static electricity is prevented from escaping from the operation panel to the circuit board and causing the circuit board to malfunction. Is.

Another object of the present invention is to prevent static electricity from being scattered from the operation panel to the circuit board by configuring the LCD cover to cover the liquid crystal display unit.

Still another object of the present invention is to extend the substantial distance of the LCD cover by providing at least an extension portion for increasing the creepage distance at a portion where the actual distance from the operation panel to the circuit board is short and static electricity is dissipated. This prevents static electricity from flying from the operation panel to the circuit board.

[0010]

In order to achieve such an object, the present invention provides an electronic device having an operation panel having a liquid crystal display part for visually recognizing various keys and the state of the device. A liquid crystal display unit is configured by a circuit board that drives the liquid crystal display unit, an operation panel cover facing the liquid crystal display unit is provided with an opening, and an LCD cover formed by a mold is fitted into the opening, and the L
The CD cover is configured to cover the liquid crystal display unit by increasing the creepage distance between the LCD cover and the operation panel cover to the circuit board, so that static electricity is applied to the circuit board from the front surface of the operation panel cover. It is what prevented the flying.

Further, according to the present invention, in an electronic device having an operation panel for displaying by a liquid crystal display unit, the liquid crystal display unit is a circuit board on which a driving integrated circuit is mounted and a liquid crystal display driven by the circuit board. And an opening having a shape corresponding to the liquid crystal display is provided in the panel cover of the operation panel, and an LCD cover formed by a mold is fitted into the opening, and the LCD cover includes the LCD cover and the LCD cover. An extension portion for increasing the creepage distance is provided at a portion where the actual distance from the operation panel cover to the circuit board is short and static electricity is released, and the LCD cover and the operation panel cover are extended by the extension portion. And a substantial distance from the panel cover to the circuit board is extended to prevent static electricity from flying from the panel cover to the circuit board.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIGS. 1 to 7 relate to the first embodiment of the present invention, in which an ink jet recording apparatus is used as a recording system.

FIG. 1 shows the overall construction of a facsimile apparatus. In FIG. 1, the facsimile apparatus has a paper feed system A for supplying recording sheets, a recording system B as a recording apparatus, and
A reading system C for reading an image written on a document and an operation unit D are included.

The paper feeding system A feeds the recording sheets 2a and 2b placed in the paper feeding cassettes 1a and 1b to the feeding rollers 3a and 3b.
And the tabs 4a and 4b facing each other are 1
The sheets are separated and fed one by one, and the recording sheets 2a, 2b are conveyed by feed roller pairs 5a, 5b, 5c, 5d and supplied to a recording system B described later. Further, near the front side of the recording system B, a front end sensor 6 such as a photo sensor or a micro switch for detecting the front end positions of the recording sheets 2a and 2b is provided.

The sheet feeding cassettes 1a and 1b are detachably attached to the main body 7, and the feeding rollers 3a and 3b are also provided.
b, the feed rollers 5a, 5b, 5c, 5d and the tip sensor 6 are provided on the main body 7.

The recording system B is supplied from the paper feeding system A in response to an image signal transmitted from another machine, an image signal transmitted from a reading system C described later, or data output from a computer described later. The image is recorded on the recording sheets 2a and 2b.

In detail, the platen roller 8a of the recording system B
The recording sheets 2a and 2b are conveyed by the recording sheet 2a and 2b, and an image is formed by the ink droplets ejected from the ink jet cartridge 9 adhering to the recording sheets 2a and 2b according to the image signal or data.

The recording sheet 2 on which a predetermined image is formed
The sheets a and 2b are further conveyed in the direction of the arrow a by the paper discharge rollers 10a and the spurs 10b, and are conveyed by the discharge rollers 11a and 11b to be discharged outside the apparatus and stacked.

On the other hand, the reading system C irradiates the manuscript 13 with light and converts the reflected light into an electric signal, and transmits this signal to another device according to the operation mode, or to its own recording system B. It is a thing.

More specifically, a plurality of originals 13 are placed on the original tray 15, and the originals 13 are separated and fed one by one by a separation roller 16a and a pressure contact piece 16b which is pressed against the separation roller 16a.
The original 13 is conveyed by the pair of conveying rollers 17a and 17b and the pair of discharging rollers 18a and 18b and discharged to the outside of the apparatus. Then, while the document 13 is being conveyed, the image information is read by the reading unit constituted by the photoelectric conversion element 19 such as a contact sensor, and the image signal is transmitted to its own recording system in the copy mode and transmitted. In the mode, it is configured to be transmitted to the recording system of another device.

The original tray 15, the separation roller 16a,
Conveying roller 17a, discharging roller 18a, photoelectric conversion element 1
9 are provided in the apparatus main body 7, respectively.

The operation section D is provided above the document feeding mechanism in the reading system C, and is indicated by an arrow e with respect to the apparatus main body 7.
It is configured so that it can be rotated in any direction, and when a document in the reading system has a conveyance failure, the jam can be easily released.

The operation section D is for performing the above-mentioned mode switching operation, copy operation, transmission operation, printer operation, etc., and is provided with keys corresponding to various operations.

FIG. 2 shows a sectional view of the operation panel as the operation section D, and FIG. 3 shows a perspective view of the operation panel. 2 and 3, reference numeral 20 denotes an operation panel cover, and an electric board 23 is arranged in the operation panel covered by the operation panel cover 20 at a predetermined distance from the operation panel cover 20. The various keys 2 are provided on the electric board 23.
7 and the light emitting diode 24 are mounted. A liquid crystal display unit (hereinafter referred to as LCD) 21 is provided between the electric board 23 and the operation panel cover 20.
D21 is composed of a liquid crystal display section 21a and a circuit board 21b for driving the liquid crystal display section 21a, and a driving IC 21c is provided on the surface of the circuit board 21b opposite to the mounting surface of the liquid crystal display section 21a. ing. The operation panel cover 20 has an opening 20a for fitting the LCD cover 22 and a hole 20b for the LED guide 26 as shown in FIG. The LCD cover 22 is made of a transparent molding material as shown in FIG. This LC
The D cover 22 has an upper surface so as to completely cover the LCD 21,
Both sides are composed of an integral part. Since the LCD cover 22 is made of a transparent material, the display content of the LCD 21 can be easily confirmed from the outside of the operation panel. Further, on the upper surface of the LCD cover 22, an LCD sheet 25 having a printed portion excluding the display portion of the liquid crystal display portion 21a is attached. This is because the LCD cover 22 is made of a transparent material, so that the liquid crystal display unit 21a is set by the user.
The purpose of this is to prevent the chassis that covers the peripheral edge of the chassis from being visible. Further, an LED guide 26 for guiding the light of the light emitting diode 24 mounted on the electric board 23 to the surface of the operation panel 20 and shining it cleanly is also provided.
This LED guide 26 needs to be made of a transparent molding material in order to guide light.
It is configured as one component integrated with the D cover 22. The user uses the keys 27 on the operation panel 20 to perform a facsimile operation such as a mode switching operation, a copy operation, and a transmission operation according to the operation procedure or while confirming the display of the LCD 21 and the lighting of the light emitting diode 24. Even if static electricity is discharged from the user's fingertip when the user touches the operation panel cover 20, the discharge is performed by following the path indicated by the path 28 in FIG. 2, so that the discharge distance can be lengthened. Therefore, static electricity does not reach the LCD 21, and the device does not malfunction and can be used with confidence. Here, the reason why the device does not malfunction will be considered concretely through the path 28. Before that, the LCD 21 and static electricity will be considered. LCD2
1 is a liquid crystal display portion 21a and a circuit board 21b as shown in FIG.
And the driving IC 21c constitute a relatively small unit. Therefore, since the circuit board 21b is considerably smaller than the electric board 23, the ratio of the drive IC 21c to the mountable area of the circuit board 21b is high. Therefore, the electric board 23 can be easily provided with a ground pattern for preventing static electricity.
The circuit board 21b of D21 cannot easily be provided with a ground pattern for static electricity prevention because of the area occupied by the driving IC 21c. Conventionally, the panel cover is composed of one large mold component, or a liquid crystal display device is used. The panel cover is located from the end position to the center.
In the present invention, when the circuit board 21b is not provided with a ground pattern for preventing static electricity, the influence of static electricity appears most strongly in the driving IC 21c of the circuit board 21b. It is a countermeasure against static electricity. Generally, static electricity is 1 in the air
It is said that a voltage difference of about 1 KV is required to discharge a distance of mm. In addition, the flow on the resin surface depends on the material of the resin and the state of the surface finish, but with a voltage difference of about 1 KV, it will flow a distance that is 1,5 to 2 times that of air. In addition, if there is a lot of static electricity from the user's fingertip, a voltage of 10KV to 15KV is generated, but it is also said that a voltage of 20KV is generated when it is placed in a dry state in winter and covered with Joutan. It is being appreciated.

Therefore, in the present invention, the operation panel cover 2
The LCD cover 22 is fitted into the opening 20a formed in 0, and the creepage distance between the LCD cover 22 and the operation panel cover 20 to the circuit board 21b, particularly the driving IC 21c is increased to cover the LCD 21. The static electricity does not easily fly from the panel cover 20 to the circuit board 21b, especially the driving IC 21c.

The specific dimensions of the LCD cover 22 and the LCD 21 are shown in FIGS. 5 and 6, and when the creepage distance from the operation panel cover 20 to the circuit board 21b, particularly the driving IC 21c is measured, as shown in FIG. The creeping distance from the operation panel cover 20 to the point P of the LCD cover 22 is 34 mm, and the shortest spatial distance from the point P of the LCD cover 22 to the circuit board 21b is 6 mm. Therefore, a voltage of 17 KV is required for a creepage distance of 34 mm, a voltage of 6 KV is required for a clearance of 6 mm, and a total voltage of 23 KV is required. This is required to exceed the maximum voltage of 20 KV that may generate static electricity, and static electricity can be prevented from flying to the circuit board 21b. In addition, the shortest space distance from the point P of the LCD cover 22 to the driving IC 21c is 10 mm, which requires a voltage of 10 KV and a total voltage of 27 KV.
It also prevents static electricity from flying to c. Also, considering the path 28, the creepage distance is 11 mm and the spatial distances are 8 mm, 8, 5 mm, and 6 mm. Therefore, the total space distance is 22, 5 mm, the voltage of 22, 5 KV is required, the creepage distance of 11 mm 5, the voltage of 5 KV is required, and the total voltage of 28 KV is required.
Further, up to the driving IC 21c, a voltage of 32 KV is required. Therefore, even if the route where the static electricity fly is considered as the route 28, it is possible to prevent the static electricity from flying to the circuit board 21b and the driving IC 21c.

(Second Embodiment) In the first embodiment, an example is shown in which the light guide 26 and the LCD cover 22 are formed as an integral mold component. However, it is also possible to provide the light emitting diode at a position visible from the surface of the operation panel 20 without using the light guide 26 for reasons of design, cost and the like. FIG. 8 shows a sectional view of the operating portion at this time.

As shown in FIG. 8, an electric board 33 is arranged behind the operation panel 30 at a predetermined interval. Electrical components such as the LCD 31 and the light emitting diode 34 are mounted on the electrical substrate 33. An LCD cover 32 made of a transparent molding material is provided on the upper surface of the LCD 31, and the LCD cover 32 is integrally formed on both the upper surface and the side surface so as to completely cover the LCD 31. Since the LCD cover 32 is made of a transparent material, the display contents of the LCD 31 can be easily confirmed from the outside of the operation panel. Further, on the upper surface of the LCD cover 32, the part excluding the display part of the LCD 31 is printed.
A CD sheet 35 is attached. This is because the LCD cover 32 is made of a transparent material so that the user can
This is to prevent the chassis made of 31 metal from being seen. The light emitting diode 34 is mounted on the electric board 33 so that the surface thereof is substantially flush with the surface of the operation panel 30. Therefore, the lighting state of the light emitting diode 34 can be easily known, and the user can know the state of the device from a distance.

The user follows the operation procedure or LC
While confirming the display of D31 and the lighting of the light emitting diode 34, a facsimile operation such as a mode switching operation, a copy operation and a transmission operation is performed using the key 37 on the operation panel.

According to this embodiment, the user operates the operation panel 30.
Even if static electricity is discharged from the user's fingertip when touching, the discharge is performed by following the path indicated by 38 in FIG.
The static electricity does not reach up to 1 and it can be used with confidence without malfunctioning as a device.

(Third Embodiment) In the first and second embodiments, since the LCD cover is made of a transparent material by sticking the LCD sheet on the surface of the LCD cover, the user can change the LCD screen. It prevented me from seeing the chassis made of metal.

However, since one part is added, the cost of parts increases, and it takes time to assemble.
The LCD sheet was abolished in consideration of the possibility that the appearance quality may deteriorate because the CD sheet is attached diagonally.
The same effect can be obtained by silk-printing the surface of the LCD cover excluding the portion corresponding to the display unit so that the user cannot see the metal chassis of the LCD. FIG. 9 shows a cross section of the operating portion of this embodiment.

As shown in FIG. 9, an electric board 43 is arranged behind the operation panel 40 at a predetermined interval. On this electric board 43, electric parts such as the LCD 41 and the light emitting diode 44 are mounted. An LCD cover 42 made of a transparent mold material is provided on the upper surface of the LCD 41, and the LCD cover 42 is made of an integral part on both the upper surface and the side surface so as to completely cover the LCD 41. The upper surface of the LCD cover 42 is almost the operation panel 40.
It is configured to be the same as the exterior surface of. The LCD
Although the cover 42 is made of a transparent material, the surface of the cover 42 is silk-printed to prevent the user from seeing the metal chassis of the LCD 41. Further, since the silk printing range is only in the part where the LCD display part is avoided, the display contents of the LCD 41 can be easily confirmed from the outside of the operation panel.

The user follows the operation procedure or LC
While confirming the display of D41 and the lighting of the light emitting diode 44, a facsimile operation such as a mode switching operation, a copy operation and a transmission operation is performed using the key 47 on the operation panel.

According to this embodiment, the user operates the operation panel 40.
Even if static electricity is blown from the user's fingertip when touching, the discharge is performed by following the path indicated by 48 in FIG.
The static electricity does not reach up to 1 and it can be used with confidence without malfunctioning as a device.

In the above embodiment, the LCD cover 22 covers the liquid crystal display unit 21 to prevent static electricity from being scattered from the operation panel to the circuit board 21b. However, the present invention is not limited to this. The LC that increases the creepage distance only in the area where the actual distance from the operation panel to the circuit board is short and static electricity is discharged
An extension portion of the D cover may be provided to extend the substantial distance to prevent static electricity from flying from the operation panel to the circuit board. That is, the LCD cover is not shaped so as to surround the liquid crystal display unit, and the creepage distance is increased only in a portion where the actual distance from the LCD cover and the operation panel cover to the circuit board is short and static electricity is dissipated. The extension is provided to prevent static electricity from flying.
In this case, it is very effective to provide the extension portion at a portion where the actual distance from the LCD cover and the operation panel cover to the driving integrated circuit of the circuit board is short and static electricity is discharged.

[0038]

As described above in detail, according to the present invention, in an electronic device having an operation panel having various keys and a liquid crystal display section for visually recognizing the state of the apparatus, the liquid crystal display section and the liquid crystal display section are provided. A liquid crystal display unit is configured with a driving circuit board, an opening is provided in an operation panel cover facing the liquid crystal display unit, and an LCD cover formed of a mold is fitted into the opening, and the LCD cover is the LCD.
By increasing the creepage distance from the cover and the operation panel cover to the circuit board to cover the liquid crystal display unit, static electricity is less likely to fly from the front surface of the operation panel cover to the circuit board. Is something that can be done. Since the LCD cover, which is a member separate from the operation panel cover, is used as a countermeasure against static electricity on the liquid crystal display unit in this manner, it is not necessary to make the operation panel large and unbalanced in design, and the operation panel is made small. In addition, the position of the liquid crystal display device is not restricted and the degree of freedom in design can be improved.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a facsimile apparatus according to a first embodiment.

FIG. 2 is a cross-sectional view of the inside of the operation panel unit of FIG.

FIG. 3 is a perspective view of the operation panel of FIG.

FIG. 4 is a partial detailed view of an operation panel cover shown in FIG.

5 is a perspective view of the LCD cover shown in FIG. 2. FIG.

FIG. 6 is a diagram showing the liquid crystal display unit of FIG.

FIG. 7 is a diagram illustrating a route of static electricity in the operation panel unit shown in FIG.

FIG. 8 is a cross-sectional view showing the inside of the operation panel unit according to the second embodiment.

FIG. 9 is a cross-sectional view showing the inside of the operation panel unit according to the third embodiment.

FIG. 10 is a cross-sectional view showing an operation panel section of a conventional electronic device.

[Explanation of symbols]

 A paper feed system B recording system B1 CPU C reading system D operation unit 20, 30, 40 operation panel cover 21, 31, 41, 106 LCD 22, 32, 42 LCD cover 23, 33, 43 electrical board 24, 34, 44 , 105 Light emitting diode 25, 35 LCD sheet 26 LED light guide 27, 37, 47, 104 key 102 panel cover

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical indication H05F 3/02 H05F 3/02 K

Claims (10)

[Claims] 1. An electronic device comprising an operation panel having a liquid crystal display section for visually recognizing various keys and the state of the device,
A liquid crystal display unit is composed of the liquid crystal display unit and a circuit board for driving the liquid crystal display unit, and an LCD cover is formed by forming an opening in an operation panel cover facing the liquid crystal display unit and molding the opening. Insert the LCD
The cover is configured to cover the liquid crystal display unit by increasing the creepage distance between the LCD cover and the operation panel cover to the circuit board, so that static electricity can be transferred from the front surface of the operation panel cover to the circuit board. Antistatic structure of the operation panel, which is characterized by preventing flying. 2. The antistatic structure for an operation panel according to claim 1, wherein the LCD cover is made of a transparent mold. 3. The operation panel cover is provided with a light guide hole into which a light guide is fitted, and the light guide is formed integrally with the LCD cover. Antistatic structure of the operation panel. 4. The electrostatic capacitance of the operation panel according to claim 1, wherein the LCD cover has a projecting piece vertically from a side surface portion that covers the liquid crystal display unit to increase a creepage distance. Prevention structure. 5. An electronic device main body having an operation panel storage hole, a panel cover provided so as to cover the storage hole of the electronic device main body, and an opening provided in the vicinity of an end of the panel cover. A liquid crystal display portion provided at a position facing the opening, a circuit board that constitutes a liquid crystal display unit together with the liquid crystal display portion, and fitted into the opening,
By providing an LCD cover formed by a mold so as to cover the liquid crystal display unit by increasing the creepage distance from the panel cover to the circuit board, the front side of the operation panel cover is changed to the circuit board. Antistatic structure of the operation panel, which is characterized by preventing static electricity from flying. 6. The antistatic structure for an operation panel according to claim 5, wherein the electronic apparatus main body is a facsimile apparatus main body, and the operation panel is for operating the facsimile apparatus. 7. An electronic device comprising an operation panel for displaying on a liquid crystal display unit, wherein the liquid crystal display unit comprises a circuit board on which a driving integrated circuit is mounted and a liquid crystal display section driven by the circuit board. An opening having a shape corresponding to the liquid crystal display portion is provided on the panel cover of the operation panel, and an LCD cover formed of a mold is fitted into the opening, and the LCD cover includes the LCD cover and the operation panel cover. An extension portion for extending the creepage distance is provided at a portion where the actual distance from the space to the circuit board is short and static electricity is dissipated.
An antistatic structure for an operation panel, wherein a substantial distance from the CD cover and the operation panel cover to the circuit board is extended to prevent static electricity from being scattered from the panel cover to the circuit board. 8. The extension portion is provided at least in a portion where the actual distance from the LCD cover and the operation panel cover to the driving integrated circuit of the circuit board is short and static electricity is discharged. Claim 7 characterized by
Antistatic structure for the operation panel described in. 9. The antistatic structure for an operation panel according to claim 7, wherein the circuit board is formed relatively small in size with respect to the driving integrated circuit on which the mounting surface is mounted. 10. The antistatic structure for an operation panel according to claim 7, wherein the LCD cover is formed integrally with a light guide.