KR0170503B1 - Handy set in digital mobile communication system - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handy set in a digital mobile communication system. In order to solve a problem that the keypad structure of the related art is complicated and made of silicon rubber, the manufacturing process is complicated and thus it is uneconomical. In a handy set that includes a liquid crystal display, a keypad, and a handy set body, the keypad may be RCL (recall), MENU, CLR (clear), SEND (transmit), MUTE, STO (storage), and SCR. And a function switch (FUN) for displaying the functions of the switches on the liquid crystal display by the user's selection, a selection switch (SEL) for executing the function selected by the function switch, and a power supply and end switch. By designing the keypad part in a membrane method, a convenient effect can be obtained even when carrying.

Description

Handy set of CDMA system in digital mobile communication system

1 is an external configuration diagram of a conventional handy set.

2 is a detailed configuration of the lower side of the key switch of each of the general keypad according to FIG.

3 is an external configuration diagram of a handy set according to the present invention.

4 is a detailed configuration of the lower side of the key switch of each of the keypad according to FIG.

The present invention relates to a handy set used in a digital mobile communication system.

In general, a handy set is a mobile communication device, which is a personal portable communication device that enables communication at any time and anywhere.

Handy set in such a digital mobile communication system is not only more complicated than the conventional analog method, but also needs to be additionally embedded in the functional aspects.

However, the CDMA mobile terminal should be duplex mode that can simultaneously access both analog and digital methods. In this case, the dual mode should be equipped with analog circuits and digital circuits simultaneously. As the weight increases, there is a disadvantage.

As the volume increases, it is inconvenient for the user to carry, and a problem of cost increase occurs in the unit cost when the hardware is configured.

Accordingly, the external configuration of the conventional handy set is as shown in FIG.

Its structure consists of a handy set body (3), a liquid crystal display (1), a key pad (2), and a volume scroll (4). Depending on the company, a key pad cover is provided to prevent the key pad from being pressed when carrying. There is also a handy set of three.

The lower part of each key switch of the keypad 2 constructed in the conventional handy set as described above is configured as shown in FIG.

That is, due to the pressing force of the key switch 5 supported by the spring 6, the conductive rubber 7 is bonded to the PCB substrate (as shown in FIG. 2B (top view in FIG. 2A)). 8) The gold-plated pattern is contacted to display the corresponding number or function of the pressed key on the liquid crystal display 1. The key pad 2 is configured by the connection configurations under the key switch.

However, the keypad of the conventional handy set as described above has a complicated and uneconomical manufacturing process because the mold has to be made of silicon rubber by coating conductive rubber on the PCB substrate.

In addition, the external configuration of the conventional keypad 2 as described above, as shown in Figure 1, the number keys 12 (including 0 to 9, *, #), RCL (recall), MENU, Most handy sets consist of 21 or 24 keys, including CLR (clear), MUTE, END, PWR (power), STO (store), volume, and scroll (two).

Therefore, when the user is carrying, there are other problems inconvenient according to the volume and weight.

In addition, the liquid crystal display 1 displays a selected phone number, battery charge status, logo, etc. as a basic menu, and includes In Use, No SRV (No Service), Roam, CDMA, FDMA, and MSG (Message). So that the user can see the current situation.

In the conventional handy set configured as described above, the key matrix becomes complicated when the INT0 (interrupt 0) of the microprocessor scans the GPIO_0 to GPIO_17 on the MSM chip as the interrupt signal of the MSM (Mobile Station Modem) chip. As a result, there was another problem of lengthening the key scan routine.

As described above, the conventional handy set is complicated and uneconomical even when configuring circuits and components in hardware.

Accordingly, the present invention provides a handy set in a digital mobile communication system for reducing the manufacturing cost and weight, and also simplify the number of keys by designing the keypad portion in a membrane method to solve the above problems. There is a purpose.

A feature of the present invention for achieving the above object is a handy set including a liquid crystal display, a keypad, a handy set main body, wherein the keypad is RCL (recall), MENU, CLR (clear), SEND (transmission) A function switch (FUN) for displaying the functions of the MUTE, STO, and SCR switches on the liquid crystal display by the user's selection, and a selection switch for executing the function selected by the function switch. (SEL) and power supply and termination switches.

In addition, in the digital mobile communication system, additional circuits and keypads according to the CDMA dual-mode digital handy set incorporating the digital method and the analog method in the conventional analog handset have drastically reduced the complexity of the keypad and the number of key switches to reduce the number of key stations. It has reduced volume and weight, and also features a membrane-based design of the silicone rubber method of the keypad.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 3, the configuration of the handy set according to the present invention includes a liquid crystal display 11 indicating a basic operating state of the handy set and a screen state according to a user's operation, a function switch 12a, and a selection switch. 12b, the keypad 12 including the numeric key switches, and the handy set main body 33 are included.

The function switch (or FUN switch) 12a and the numeric key switch are separated from the keypad 12 so that the function switch includes software listing the functions and displays each function on the liquid crystal display 11, and then selects a selection switch ( 12b) allows you to greatly reduce the number of key switches.

For example, there are only two FUN (function) and SEL (selector) switches, RCL (Recall), MENU, CLR (clear), END, PWR (power), SEND, MUTE, STO (store), SCR ( Volume Scroll) is displayed on the liquid crystal display 11 when the FUN switch 12a is pressed, and the desired function key is selected and selected using the SEL (12) switch. will be.

Thus, 10 key switches can be used as two key switches to fully utilize the functions of all handy sets.

Therefore, in software the key scan routine is simplified and the processing of interrupt routines in the microprocessor is simplified.

According to the method proposed in the present invention, the GPIO selection lines are reduced from about 17 to about 10, the delay time for interrupt generation is reduced, and the design of the PCB board is simplified, which facilitates circuit design.

In other words, the number of key switches on the keypad is reduced, and the size of the digital hardware board can be reduced.

On the other hand, in the present invention, by designing the keypad 12 in a membrane (Membtane) method, there is an advantage that the manufacturing cost is reduced and the weight can be reduced than the general keypad, this is shown in (a), (b) of FIG. With reference to the following in detail. Here, (a) of FIG. 4 is a lower side configuration diagram of the key switch of each of the key pads 12, and (b) of FIG. 4 is an enlarged exploded perspective view of 'A' shown in (a) of FIG.

First, the membrane keypad of the present invention is shown as part A. That is, a triple film to be described later is inserted between both end layers of a PCB substrate which is typically stacked in a four-layer and eight-layer manner.

The lower side of the key switch, as shown in (a) of FIG. 4, when the user presses the key switch 13, the spring 14 is compressed and caught by the handy set main body 15, at which time the conductive rubber 16 Is moved vertically by the pressing force. The conductive rubber 16 thus moved passes through the hole 21 of the upper PCB substrate 20 and the upper film 17 shown in FIG. 4 (b) (an enlarged portion A of FIG. 4 (a)) is formed. Will be pressed. The upper conductive film 17a is coated on the bottom of the upper film 17. The upper conductor film 17a passes through the round hole 18a which is drilled in the intermediate film 18 inserted between the keypad and the lower PCB substrate to prevent a short phenomenon by the pressing force. The intermediate film 18 is in contact with the lower film 19 only when the user selects the key switch by hand, and the short is prevented when carrying, so that no cover is required.

As described above, the upper conductive film 17a of the upper film 17 that has passed through the intermediate film 18 is brought into contact with each other, whereby the operating state of the corresponding key switch pressed by the user inside the handy set is displayed on the liquid crystal display 11. Will be displayed on the screen.

On the other hand, a plurality of holes (Hole) are drilled in the upper and lower PCB substrate 20.

Accordingly, the backlight required for use at night has a thick thickness by attaching a light emitting diode directly to a PCB substrate in a conventional handy set. However, in the membrane method, the light emitting diode 22 is inserted into a hole 21 formed in the PCB substrate 20. The thickness can be reduced by designing the light through the thin hole.

Accordingly, the conventional keypad required about six light emitting diodes with backlight, but the number of key switches is reduced, so the size of the keypad is reduced, so that only four light emitting diodes need to be used.

Therefore, there is an effect that can reduce the power consumption of the light emitting diode when used at night or everyday.

In addition, since the weight and volume of the handy set are simplified, it is convenient to carry.

Claims (2)

Digital mobile communication consisting of a liquid crystal display, a key pad having key switches to be in contact with the PCB substrate by vertical movement of the conductive rubber through a spring to indicate a user's operation state on the liquid crystal display, and a handy set body. In a handy set of systems, the keypad is the user's choice of the functions of the RCL (recall), MENU, CLR (clear), SEND (send), MUTE (mute), STO (storage), and SCR switches. A function switch (FUN) for displaying on said liquid crystal display by means of; A selection switch (SEL) for executing a function selected by the function switch; An upper layer provided inside the handy set main body, in order to reduce the number of switches and to contact each other when the switches are pressed by a user's hand to display the selected signal on the liquid crystal display. And a handset set in a digital mobile communication system, wherein a triple membrane is inserted between the lower PCB substrates. The semiconductor device of claim 1, wherein the triple membrane comprises: an upper film coated on a bottom surface of a thin upper conductor film on which conductive rubber moving as the key switch is pressed is contacted through holes between upper PCB substrates; An intermediate film inserted between the keypad and the PCB substrate to prevent shorting and having a hole through which the pressed upper conductor film passes; Handy set in a digital mobile communication system, characterized in that the upper conductor film passing through the intermediate film consists of a lower film in contact with the lower conductor film formed on the upper surface.