JPH1028169A - Portable telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent too loud a sound at the portable telephone call by provid ing an infrared-ray emitting element and its receiving element, obtaining a human body detecting signal from reflection light on a human body and changing-over a hand-free call and a normal portable telephone call. SOLUTION: A control part 11 controls a power source supply circuit 9 when a call is made and when a hand-free circuit 14 is started and supplies power to an infrared-ray level detecting circuit 8 and an emission driving circuit 10. The circuit 10 drives the infrared-ray emitting element 1 so as to emit infrared-ray. At this time, mutual arrangement is executed so as to permit the infrared-ray receiving element 2 not to directly receive the emission light of the element 1 but to receive only reflection light. The circuit 8 monitors the reflection light level received by the element 2 and outputs a logical level 1 to an OR gate 15 when the level is more than a fixed value. When the output of a humanbody contact detecting equipment 16 detects the human body and outputs 1, it is outputted to transmission system and reception system variable gain amplifiers 12 and 13 so as to control both and a gain is restored to be a normal portable telephone call level.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable telephone,
In particular, the present invention relates to a mobile phone in consideration of protection on a PL for preventing an excessive sound of a mobile phone having a hands-free function.

[0002]

2. Description of the Related Art In recent years, due to its convenience, hands-free has been mounted not only on a vehicle-mounted adapter but also on a portable telephone body. As a method of mounting a hands-free function in a conventional mobile phone main body, a speaker is mounted on a rear surface of the mobile phone main body. This method will not be a problem if the mobile phone body is large and there is enough mounting space, but in order to meet the demands of the smaller and lighter era, such mounting methods naturally have limitations. . Considering the protection of the user's hearing, when the user's ear is near the earpiece part of the mobile phone, that is, near the receiver, set it to the communication level normally used as a portable device, and when the user's ear is away from the mobile phone, A receiver that can be used as a hands-free speaker at a call level that can be used as hands-free can save mounting space, and as a prior art for detecting the approach of a user from the viewpoint of protecting this user. Is
JP-A-5-22381 "telephone" and JP-A-63-122340 "hands-free communication device"
Etc.

[0003]

In the first prior art "telephone" disclosed in Japanese Patent Application Laid-Open No. H5-222381, infrared rays are detected by using a pyroelectric element as means for detecting a human body. Since the detection range is wide and the sensitivity is high, it is not suitable for detecting the approach between the earpiece portion and the user's ear.

[0004] Further, only the ringing volume is changed, and hands-free switching is not performed.

[0005] A second prior art, Japanese Patent Application Laid-Open No. 63-122.
In the "Hands-free communication device" of JP-A-340, switching to hands-free is performed after the detection of a human body, but this is more dangerous for the user.

As described above, the first problem of these conventional prior arts is that the detection range and sensitivity of the human body are inappropriate. The reason is that the heat detection of the human body is performed by the pyroelectric element. Because it is. The second problem is that it imposes a heavy burden on the user's ears, thereby damaging the user's body, especially hearing, because the user is switched to hands-free after detecting the human body.

Accordingly, it is an object of the present invention to solve the above-mentioned problems and to make it possible to safely use a hands-free mobile phone.

[0008]

SUMMARY OF THE INVENTION A portable telephone according to the present invention comprises an operation section having a microphone, a receiver speaker, dial buttons, and the like, and a display section for displaying functions, operation states, and the like. In a mobile phone that performs a telephone call by switching, by providing an infrared light emitting element and an infrared light receiving element at predetermined intervals in the left and right or up and down directions of the display window, the mobile phone can be used for the normal mobile phone call and the like. When a human body such as a face or an ear comes close to or comes into contact with the human body, the infrared light emitted from the infrared light emitting element is reflected by the human body to detect a reflected light receiving level incident on the infrared light receiving element, thereby obtaining a first human body detection signal. And switches between the hands-free call and the normal mobile phone call by the first human body detection signal. Cormorant.

A portable telephone according to the present invention is provided with an operation unit having a microphone, a receiver speaker, dial buttons, and the like, and a display unit for displaying functions, operation states, and the like. In the mobile phone to be performed, at least one capacitor element among elements constituting a phase oscillator built in the mobile phone is replaced with a capacitance formed by a housing of the mobile phone main body and an internal mounting substrate. By detecting a change in the oscillation frequency of the output of the phase oscillator due to a change in the capacitance due to a change in the charge amount of the housing when a human body such as a face or an ear touches the housing, And outputs a human body detection signal between the hands-free call and the ordinary mobile phone call according to the second human body detection signal. Perform the Toggles.

Further, the portable telephone according to the present invention switches between the hands-free conversation and the ordinary portable telephone conversation by using the first human body detection signal or the second human body detection signal as a control signal to the receiver speaker. The gain of the first variable gain amplifier for amplifying the level of the received voice to be output is variable, and the gain of the second variable gain amplifier for amplifying the level of the transmission voice input from the microphone is variable. Variable control is performed to make the gain of the first variable gain amplifier larger than the gain during the normal mobile phone call, and variable control is made to make the gain of the second variable gain amplifier smaller than the gain during the normal mobile phone talk. In addition, during the normal mobile phone call, the variable gain control is performed in the reverse of the hands-free call.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is an external view showing a mobile phone according to one embodiment of the present invention. The display window 3 is located on the side of the operation unit 6 having a plurality of dial buttons A, the microphone 5 and the receiver 4 of the earpiece unit. The display window 3 is provided with a light emitting device 1 as an infrared light emitting device and a light receiving device 2 as an infrared light receiving device. FIG. 2 is a block diagram of a mobile phone according to one embodiment of the present invention. The control unit 11 detects the presence or absence of a telephone call and the activation of the hands-free circuit 14, and controls the power supply circuit 9 to detect the infrared level when there is a telephone conversation and when the hands-free circuit is activated. Power is supplied to the circuit 8 and the light emission drive circuit 10.
Thereby, the light emission drive circuit 1 connected to the power supply circuit 9
0 and the infrared level detection circuit 8 start operating. The light emission drive circuit 10 outputs a drive voltage to the light emitting device 1 which is an infrared light emitting element to cause the infrared light emitting element to emit infrared light. The infrared light emitted from the light emitting device 1 is
The light-emitting device 1 and the light-receiving device 2 are arranged so that they are not directly received by the light-receiving device 2, and only the reflected light beam is received by the light-receiving device 2.
That is, by arranging the light emitting device 1 and the light receiving device 2 as shown in FIG. 1, when the user brings the ear or a part of the face close to the receiver 4 of the earpiece portion, the infrared light from the light emitting device 1 is reflected and received. The reflected light enters the vessel 2 and changes the voltage.

The infrared level detection circuit 8 monitors the level of the reflected light beam received by the light receiver 2, and if the level is equal to or higher than a predetermined level, sets the detection output to a binary "1", which is a logical level.
Output to R gate 15. At this time, the human body contact detector 16
Is output as "1" indicating that a human body is detected, a binary "1", which is the logical level, is output to the variable gain amplifier 12 in the transmission system and the variable gain amplifier 13 in the reception system through the OR gate, and Control each and return the gain to normal speech level. Here, if the light emission drive circuit 10 generates a predetermined fixed pulse pattern so that the infrared level detection circuit 8 detects this pattern, a malfunction will occur even if infrared light of the same wavelength is received. Operation can be assured because it can be prevented.

Next, an embodiment of detection of contact with a human body from the viewpoint of user protection will be described.

First, a first embodiment of human body contact detection will be described. When the human body comes into contact with the body of the mobile phone, the matching of the antenna is disturbed, the VSWR deteriorates, and the reflection of the transmission power increases. After recognizing this in advance, a description will be given with reference to the circuit diagram of the human body contact detector 16 in FIG.
The traveling wave transmitted from the transmission power amplifier 17 to the antenna 25 is detected by an element block including the CM coupler 18, the diode 19, the capacitor 20, and the resistor 21, and the high frequency of the traveling wave is converted to a DC level. You. Similarly, the reflected wave of the traveling wave reflected from the antenna 25 includes the CM coupler 40, the diode 24, and the capacitor 2
The high frequency of the reflected wave is detected by the element block including the resistor 3 and the resistor 22 and converted into a DC level. The detection output of each of the traveling wave and the reflected wave converted to the DC level is input to the comparator 26 and the levels are compared. FIG. 4 is a graph showing the VSWR as a gradient according to the ratio between the traveling wave power and the reflected wave power. As shown in FIG.
If the SWR is equal to or greater than a predetermined value, it is determined that there is contact with the human body, and the output logic level of the comparator 26 is set to the binary "1".

The principle of operation of the CM couplers 18 and 40 is well known in the art and will not be described.

Next, a second embodiment of human body contact detection will be described with reference to FIGS. FIG. 6 is a circuit diagram of the second embodiment, which comprises a phase oscillator including resistors 28, 29 and 30, capacitors 31, 32 and 33, and an inverting amplifier 34, a band-pass filter 35, and a comparator 36. You.

Here, if one of the capacitors 31 to 33 constituting the phase oscillator is replaced by the capacitance formed by the housing of the portable telephone body and the internal mounting board, when the human body touches this housing, the capacitance of the housing is reduced. Since the amount of charge changes, as a result, the capacitance formed between the housing and the internal mounting board changes. FIG. 7 is a cross-sectional view of the main body of the mobile phone 7, in which conductive plating 31 is applied to the inside of the housing, and the inside of the housing is in contact with a mounting board 39 by a contact fitting 38. With this configuration, a capacitance is generated between the housing and the internal mounting board.

The phase oscillator outputs its oscillation output to the band-pass filter at a frequency determined by each resistor and capacitor. The phase oscillator tunes the pass band of the band-pass filter 35 to the oscillation frequency, and compares the output of the band-pass filter with a comparator. If the detection is made at 36, the oscillation frequency changes when the human body touches the housing and the capacitance of the capacitor 31 changes.
When the output of the band-pass filter is smaller than a predetermined output, the binary output "1" is set at a logical level.
And if the output of the band-pass filter is larger than a predetermined output, a threshold level is internally set in advance so as to output a binary “0” at a logical level. The human body contact detection output can be output as "1".

As described above, according to the present invention, the portable telephone is provided with the infrared light emitting element and the infrared light receiving element, and these are arranged in the display window. The reflected light of the infrared light emitted from the light emitting element is received by the infrared light receiving element, and the approach of a human body such as a human face or ear can be electrically detected by detecting the level of the received light.

[0020]

As described above, according to the present invention, the approach of the human body to the portable telephone is detected by using the infrared light emitting element and the light receiving element, and the detection of the direct contact with the human body is performed. As a result, the accuracy of detecting a human body contact is increased, and the operation of using the mobile phone as a normal portable device and the case of sharing the same as a hands-free loudspeaker can be reliably performed. When the receiver of the earpiece is shared with the loudspeaker by the free function, it is possible to prevent the hearing function from being damaged even if the user accidentally puts the ear on the receiver during the loudspeaker.

[Brief description of the drawings]

FIG. 1 is an external view showing a mobile phone according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the mobile phone of the embodiment.

FIG. 3 is a circuit diagram showing a first human body contact detector of the mobile phone of the embodiment.

FIG. 4 is a graph showing VSWR in the mobile phone according to the embodiment as a gradient according to a ratio between traveling wave power and reflected wave power.

FIG. 5 is a diagram for explaining an operation of outputting a human body contact detection signal by the comparator of the mobile phone of the embodiment.

FIG. 6 is a circuit diagram showing a second human body contact detector of the mobile phone of the embodiment.

FIG. 7 is a configuration diagram showing a second human body contact detector of the mobile phone of the embodiment.

[Explanation of symbols]

 Reference Signs List 1 light emitting device (infrared light emitting device) 2 light receiving device (infrared light receiving device) 3 display window 4 earpiece (receiver) 5 microphone 6 operation unit 7 mobile phone 8 infrared level detection circuit 9 power supply circuit 10 light emission drive circuit 11 control unit 12, DESCRIPTION OF SYMBOLS 13 Variable gain amplifier 14 Hands-free circuit 15 OR gate 16 Human body contact detector 17 Transmission power amplifier 18 CM coupler 19,24 Diode 20,23 Capacitor 21,22 Resistor 25 Antenna 26 Comparator 28,29,30 Resistor 31,32 , 33 Capacitor 34 Inverting Amplifier 35 Bandpass Filter 36 Comparator 38 Contact Fitting 39 Mounting Board 40 CM Coupler 41, 42 Resistor

Claims (3)

[Claims] 1. A mobile phone comprising: an operation unit having a microphone, a receiver speaker, a dial button, and the like; and a display unit for displaying a function, an operation state, and the like, for switching between a hands-free call and a normal mobile phone call. By providing an infrared light emitting element and an infrared light receiving element at predetermined intervals in the left and right or up and down directions of the display window, when a human body such as a face or an ear approaches or comes into contact with the mobile phone during the normal mobile phone call, etc. A first human body detection signal is output by detecting a reflected light receiving level at which the infrared light emitted by the infrared light emitting element is reflected by the human body and is incident on the infrared light receiving element, and the first human body detection signal is output. Switching between the hands-free call and the ordinary mobile phone call by using a mobile phone. 2. A mobile phone comprising a microphone, a receiver speaker, a dial button, and an operation unit and a display unit for displaying functions, operation states, and the like, for switching between a hands-free call and a normal cell phone call. By replacing at least one capacitor element among the elements constituting the phase oscillator built in the mobile phone with the capacitance formed by the housing of the mobile phone main body and the internal mounting substrate, a human body such as a face or an ear can be obtained. A second human body detection signal is output by detecting a change in the oscillation frequency of the phase oscillator output caused by a change in the capacitance caused by a change in the amount of charge in the case when touching the case. And switching between the hands-free call and the ordinary mobile phone call by the second human body detection signal. Mobile phone. 3. The level of a received voice to be output to the receiver speaker as a control signal by using the first human body detection signal or the second human body detection signal as a control signal for switching between the hands-free call and the ordinary mobile phone call. And the gain of the second variable gain amplifier for amplifying the level of the transmission voice input from the microphone, that is, the first variable gain during the hands-free communication. Variable control for increasing the gain of the amplifier to be greater than the gain for the ordinary mobile phone call, and variable control for making the gain of the second variable gain amplifier smaller than the gain for the ordinary mobile phone talk; A mobile phone which performs variable gain control reverse to that during hands-free communication during a call.