JPH055718Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a handset for a portable telephone used as a car telephone or the like.

(Prior Art) A handset used in a car telephone has a built-in keypad for transmitting selection signals, etc., and is provided with a liquid crystal display (LCD) for displaying an outgoing dial.

As is well known, this liquid crystal display requires light in order to read the numbers, etc. on the display.

Due to the location where car phones are installed, there are no problems during the day, but when making calls at night, you will have to operate them in the dark unless you use an interior light. For this purpose, a backlight is required to display the liquid crystal display.

(Problems to be Solved by the Invention) By the way, since a key pad is built into the handset of a car phone, the usable casing surface of the handset is limited, and there is very little room for installing a new light key.

In general, conventional telephones have one key and one function, so it is not possible to add any more functions when developing a telephone, and it is extremely difficult to add new functions, especially in the case of a handset. .

Therefore, the inventor of this invention focused on the fact that the mute key on a car phone only performs the function of putting the microphone in mute state when a call is in progress.

The object of the present invention is to provide a handset using a mute/light key.

(Means for Solving the Problems) In order to achieve the above object, the handset according to the present invention disconnects the microphone and lights up the backlight when operated in a talking state, and lights only the backlight when operated in a standby state. It is configured with a dual-purpose/light key that allows you to

(Example) Hereinafter, the present invention will be explained in more detail with reference to the drawings. FIG. 1 is an external view showing an embodiment of a handset according to the present invention. A keypad 1 for sending out selection signals and the like is provided at the center of the front face of the handset 9. A microphone 4 is provided at the bottom of the front, and a liquid crystal display (LCD) 8 with a backlight 7 is provided at the top of the keypad 1. There is also a receiver on the front, but it is omitted in FIG. The Miyuto/Light key 2 is provided on the upper side of the device so that it can be easily operated when held.

When considering securing a grip area for a handset, there are very few usable surfaces.

FIG. 2 is a block diagram showing the configuration of the circuit section of the handset.

Miyuto/light key 12 is the central control circuit 13
The output of the microphone 14 is connected to the central control circuit 13 via a switch 15. Further, the backlight 17 is configured to be supplied with current from the central control circuit 13 via the switch 16.

When the phone is in standby mode, press the Mute key 12
When is pressed, a control signal is supplied to the central control circuit 13 via the mute key 12.

Since the central control circuit 13 determines that the telephone is in the standby state, the switch 16 is closed. This turns on the backlight 19. The switch 15 remains closed.

On the other hand, in the case of a telephone call, the central control circuit 13 opens the switch 15 to put it in the mute state, closes the switch 16, and turns on the backlight 17.

The mute key is a key used only to mute the microphone during a call.

In other words, it is not used at all during standby.

A function to turn on the backlight has been added to this Mute key, so this key can be fully useful even during standby mode.

Also, muting during a call means not using the microphone, and therefore moving the handset away from the ear. At this time, the back light turns on at the same time, so you can see the keys even in the dark.

(Effects of the Invention) As described above, according to the present invention, it is possible to provide a handset equipped with a mute/write key that has the function of a light key added to the mute key.

The configuration according to the present invention has the advantage that even if a new key cannot be added due to the hardware configuration, a light switch function can be easily provided.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the external appearance of a handset according to the present invention, and FIG. 2 is a diagram showing the configuration of the internal circuit of the handset. 1...Keypad, 2, 12...Miute/Light key, 3...Central control unit (CPU),
4,14...Mike, 15,16...Switch,
7, 17...Backlight, 8...Liquid crystal display (LCD).

Claims (1)

[Scope of utility model registration request] This handset has a mute/light key that disconnects the microphone and lights up the backlight when operated in a call state, and lights only the backlight when operated in a standby state.