JPH04343529A - Illuminating device for mobile radio set - Google Patents

Abstract

PURPOSE:To improve the operability and visibility for a user without consuming unnecessary power. CONSTITUTION:An illuminating device 3 for illuminating at least one of a key operation part 2 consisting of number keys, function keys, etc., and a numeral display device 1 is provided and a current flow flowing into the device 3 is adjusted by a current control circuit 8 in accordance with the output of a photodetecting element 7 for detecting the brightness of its periphery and converting the detected result into an electric signal. On the other hand, the ON/OFF of a current flowing into the device 3 is controlled by an output from a threshold circuit.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in the lighting control function of a lighting device in a mobile radio device.

0002

[Prior Art] Fig. 3 shows a conventional mobile radio device, which schematically shows the functions described on page 24 of the revised first edition of ``Cellular Phone User's Manual Type 803'' by NTT Central Mobile Communications Corporation. FIG. 2 is a block configuration diagram of a lighting device. In the figure, 1 is a numeric display, 2 is a key operation section having number keys and function keys, 3 is a lighting device that illuminates the numeric display 1 and the key operation section 2, and 4 is any key of the key operation section 2. a key operation detection unit that detects that the key has been pressed;
is a timer that operates for a preset time; 6 is a switch controlled by the timer 5;

Next, the operation will be explained. When any key on the key operation section 2 is pressed while power is being supplied to the mobile radio, the key operation detection section 4 detects this and starts the timer 5. The timer 5 operates for a specified period of time and closes the switch 6 during that operating time, so that current from a battery (not shown) is supplied to the lighting device 3 and the lighting device 3 lights up.

0004

Since the conventional lighting device for a mobile radio is constructed as described above, when a key on the key operation section is pressed, the lighting device lights up regardless of the surrounding brightness or darkness. Therefore, there is a problem in that the lighting device turns on even in a situation where the surroundings are sufficiently bright and lighting is unnecessary, resulting in unnecessary power consumption from the battery. The present invention was made in order to solve the above-mentioned problems, and an object of the present invention is to provide a lighting device for a mobile radio device with excellent operability and visibility for the user without consuming unnecessary power. shall be.

[0005]

[Means for Solving the Problems] The present invention is provided with an illumination means for illuminating at least one of a key operation unit such as a number key, a function key, and a numeric display, and a movement that illuminates the illumination means for a certain period of time by key operation. A lighting device for a wireless device, comprising a detection means for detecting brightness and darkness in the surroundings and converting it into an electrical signal, and a current control means for controlling the amount of drive current flowing through the lighting means in accordance with the electrical signal from the detection means. This is how it was done. The present invention also provides an illumination device for a mobile radio, which includes illumination means for illuminating at least one of a key operation unit such as a number key or a function key, and a numeric display, and lights up the illumination means for a certain period of time in response to a key operation.
a detection means that detects surrounding brightness and converts it into an electrical signal;
The apparatus includes a determining means for determining the level of the electrical signal from the detecting means, and a switching means for controlling on/off of the illumination means based on the determination result of the determining means.

[0006]

According to the present invention, the surrounding brightness and darkness is detected by the detection means, and the amount of drive current supplied to the lighting device is controlled in accordance with the detected electrical signal. Further, the level of the detected electric signal is determined by the determining means to control whether the lighting device is turned on or off.

[0007]

Embodiments Hereinafter, embodiments of the present invention will be explained with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a lighting device for a mobile radio according to the present invention. In the figure, 1 is a numeric display, 2 is a key operation unit having number keys and function keys, and 3 is a numeric display. A lighting device illuminates the display 1 and the key operation section 2; 4 is a key operation detection section that detects when any key of the key operation section 2 is pressed; 5 is a key operation detection section that is set in advance based on the output of the key operation detection section; 6 is a switch controlled by the timer 5; 7 is a light-receiving element that detects surrounding brightness as a light amount and converts it into an electrical signal during the time that the timer 5 is operating; 8 is not shown; This is a current control circuit that controls the amount of current supplied to the lighting device 3 from the battery.

Next, the operation of the above embodiment will be explained. When any key on the key operation unit 2 is pressed while the mobile radio is powered, the key operation detection unit 4 detects this and starts the timer 5. The timer 5 operates for a specified period of time, and during that operation time the switch 6
is closed, whereby current from a battery (not shown) is supplied to the lighting device 3 via the current control circuit 8. Here, the illuminance corresponding to human dark adaptation and photopic adaptation is set according to the amount of light detected by the light receiving element 7, and the brightness of the lighting device 3 is adjusted by controlling the current control circuit 8. Furthermore, when the amount of ambient light detected by the light receiving element 7 is sufficient to read the numeric display 1 or operate the key operation section 2, the current control circuit 8 becomes high impedance and opens the circuit, and the lighting device Cut off the current to 3. The brightness of the illumination device 3 is adjusted according to the amount of surrounding light detected by the light receiving element 7 when the user of the mobile radio device turns on the power.

In the above embodiment, the brightness of the illumination means is adjusted according to the amount of surrounding light, but the illumination device may be turned on only when the amount of light is low. Figure 2
is a block configuration diagram showing another embodiment of the illumination device for a mobile radio according to the present invention, in which the key operation detection unit 4 detects that a key of the key operation unit 2 is pressed, and the timer 5 operates. A positive signal is input to one input of the AND circuit 10 when the At the same time, the amount of light from the light receiving element 7 is input to the threshold circuit 9, and a positive signal is given to the other input of the AND circuit 10 only when the amount of light is below the threshold. As a result, the AND circuit 10 outputs a positive signal, and the switch 6
is closed, and a driving current flows through the lighting device 3.

This embodiment has the advantage that lighting can be suppressed in bright situations where lighting is unnecessary, and that the configuration is simple because no light quantity control is performed in response to human adaptation to brightness.

[0011]

As described above, according to the present invention, the output of the light-receiving element that detects the brightness of the surroundings is used as the lighting condition of the lighting device, thereby creating an operation and display environment that is easy to see and operate for the operator. In addition to being able to provide
Since it is possible to reduce power consumption, it is possible to reduce the size of the installed battery and extend the operating time, which are important factors for miniaturization of portable devices.

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram showing an embodiment of a lighting device for a mobile radio according to the present invention.

FIG. 2 is a block configuration diagram showing another embodiment of a lighting device for a mobile radio according to the present invention.

FIG. 3 is a block diagram of a conventional illumination device for a mobile radio.

[Explanation of symbols]

1 Numerical display 2 Key operation section 3. Lighting device 4 Key operation detection section 5. Timer 6 Switch 7 Photo receiving element 8 Current control circuit

Claims (2)

[Claims] 1. An illumination device for a mobile radio, comprising illumination means for illuminating at least one of a key operation unit such as a number key, a function key, and a numeric display, and lighting the illumination means for a certain period of time in response to a key operation. A mobile radio device comprising: a detection means for detecting brightness and darkness of the illumination means and converting it into an electric signal; and a current control means for controlling the amount of drive current flowing through the illumination means in accordance with the electric signal from the detection means. lighting equipment. 2. An illumination device for a mobile radio, comprising illumination means for illuminating at least one of a key operation section such as a number key, a function key, and a numeric display, and in which the illumination means is turned on for a certain period of time by key operation. a detection means for detecting the brightness and darkness of the light and converting it into an electric signal; a determination means for determining the level of the electric signal from the detection means; and a switch means for controlling on/off of the illumination means based on the determination result of the determination means. A lighting device for a mobile radio device, comprising: