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1. 65 4 the detection signal is sent out to the control circuit 11 The control circuit 11 on the basis of this detection signal sends out a stop signal to the driver 12 Thus driving of the driver 12 is stopped and the light emit ting element 3 is extinguished at step n7 Afterwards when the user s ear is departed again from the piezo electric element 7 the control circuit 11 then sends out a drive signal to the driver 12 to drive the driver 12 This thereby lights the light emitting element 3 again Afterwards by pressing the hang up button 4 at step n3 a communication circuit cut off signal is sent out from the handset 25 to the base unit 23 at step n4 Thus the base unit 23 receives the communication circuit signal at step m4 in FIG 3 Then the connection with the tele phone line 22 is cut off at step m5 so that the light emitting element 3 of the handset 25 goes out In this way while the handset 25 is in service the light emitting element 3 is being extinguished and the consumption of the battery 28 can be considerably re duced The invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof The present embodiments are therefore to be considered in all respects as illustrative and not restrictive the scope of the invention being indicated by the appended claims rather than by the foregoing description and all changes which come within the meaning and the
2. a device for display to indicate the in service State c2 a device for detecting the contact of the speaker area with a part of the body c3 a device for detecting the talk to detect the in service state and c4 a device for controlling to stop the display action of the display a device when the speaker area is in contact with a part of the body and is in service in response to the output from the contact detecting de vice and talk detecting device and to effect the display 2 action by the display device while the speaker area is not in contact with the body during service and c5 the handset is electrically powered by the bat tery Preferably the display device is a light emitting di ode Also preferably the contact detecting device is a piezoelectric element Further preferably the handset is provided with de vice for dial input and the controlling device generates a dial signal in response to the output of this dial input _ device so as to call the partner by the base unit Ny 5 40 50 60 More preferably the contact detecting device has a penetration hole and the speaker is disposed behind this contact detecting device The invention also relates to a cordless telephone having a base unit connected to a telephone line and a handset connected to the base unit through radio com munication and equipped with a device for display so as to indicate the in service state by the handset by the dis
3. in contact with an area proximate to the speaker of the handset in response to the contact detecting means 7 A handset of a cordless telephone including a base unit and the handset including a speaker and a transmit ter for communicating by radio communications with the base unit the handset further comprising display means for displaying indication of the cord less telephone being in service detecting means for emitting a signal upon detecting contact of a user to an area of the handset in close proximity to the speaker and control means operatively connected to said display means and said detecting means for controlling said display means to display indication of the cordless telephone being in service upon not re ceiving an output signal from said detecting means when the cordless telephone is in service and for controlling said display means to stop displaying indication of the cordless telephone being in ser vice upon receiving an output signal from the de tecting means when the cordless telephone is in service 8 The handset of claim 7 further comprising in service detection means operatively connected to said control means for outputting a signal to said control means upon detecting that the cordless telephone is in service 25 45 55 65 10 30 40 6 9 The handset of claim 7 wherein the detecting means is a piezoelectric element and the piezoelectric element is disposed in close prox
4. the following detailed description taken in conjunction with the drawings FIG 1 is a perspective view showing the entire struc ture of a cordless telephone in one of the embodiments of the invention FIG 2 is a block diagram showing a schematic elec trical structure of the cordless telephone in FIG 1 FIG 3 is a flow chart for explaining the operation of a base unit 23 and FIG 4 is a flow chart for explaining the operation of a handset 1 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawings one of the preferred embodiments of the invention is described in details below 5 010 566 3 FIG 1 is a perspective view showing the entire struc ture of a cordless telephone 21 according to an embodi ment of the invention The cordless telephone 21 is connected to a telephone line 22 and include a handset 25 and a base unit 23 for radio communication there with the base unit 23 having an antenna 24 for radio communication with the handset 25 The handset 25 includes key switches 2 such as numeric keys as a dial input device provided inside the grip of a handset unit 1 a light emitting element 3 as a display device composed of a light emitting diode LED or the like disposed in the vicinity of the key switches 2 inside the grip a dis connect or hang up button 4 as the talk completion device for changing over between line capturing state and talk waiting state a transmitter 5 with a micro phone 1
5. 4 built in and located near the mouth of the user a receiver 6 containing a piezoelectric element 7 known as touch sensor or the like as the contact detecting device when contacting with the ear that is a part of the body of the user contacted while talking an antenna 8 for communicating with the base unit 23 and a battery 28 FIG 2 is a block diagram showing a schematic elec trical construction of the cordless telephone 21 In this diagram a key signal by the operation of the key switch 2 is given to a control circuit 11 which is a device for controlling the members in the handset 25 It is also sent out from the antenna 8 through a transmit ting and receiving circuit 13 and is received through the antenna 24 of the base unit 23 It is then sent out to the telephone at the destination through the telephone line 22 Further by the key signal from the key switch 2 the control circuit 11 sends out a drive signal to a driver 12 for lighting up the light emitting element 3 Thus the driver 12 is driven to light up the light emit ting element 3 In the meantime a signal from the piezo electric element 7 is applied to the control circuit 11 and a stop signal is sent out to the driver 12 from this piezoelectric element 7 Thus driving of the driver 12 is stopped to extinguish the light emitting element 3 At the same time the control circuit 11 sends out a control signal to the transmitting and receiving circuit 13 The transmitting an
6. D COMMUNICATION CIRCUIT ON COMMUNICATION CIRCUIT CUTOFF SIGNAL RECEIVED 2 YES COMMUNICATION CIRCUIT OFF m5 U S Patent Apr 23 1991 Sheet 4 of 4 5 010 566 Fig 4 ni COMMUNICATION CIRCUIT YES COMMUNICATION CIRCUIT TALK BUTTON ON CUTOFF SIGNAL SENDING PIEZOELECTRIC ELEMENT ON LIGHT EMITTING ELEMENT3 OFF 17 n9 LIGHT EMITTING ELEMENT 3 ON 5 010 566 1 CORDLESS TELEPHONE BACKGROUND OF THE INVENTION 1 Field of the Invention The present invention relates to a cordless telephone having a base unit connected to a communication line such as telephone line and a handset connected to the base unit by radio communication and furnished with a device for display so as to indicate that the handset is in service 2 Description of the Prior Art In the conventional telephone the service can be directly recognized by lifting the handset off the cradle 1 and the end of a call can be confirmed directly by put ting the handset back on the cradle In a cordless tele phone which is recently spreading in popularity how ever the handset is often placed at a distance from the base unit In this case therefore the end of a call cannot be confirmed by the handset in the conventional method and in the hitherto cordless telephone a pilot lamp is built in the handset as the device for display This lamp is lit while the handset is in service Further by pressi
7. United States Patent Seo 54 CORDLESS TELEPHONE 75 Inventor Masayoshi Seo Higashi Hiroshima Japan 73 Assignee Sharp Kabushiki Kaisha Osaka Japan 21 Appl No 403 887 02 Filed Sep 7 1989 30 Foreign Application Priority Data 8 1988 JP 63 225347 51 Int 022042 2 0000 04 11 00 52 55 379 61 379 63 58 Field of Search 379 59 61 62 63 379 354 396 376 61 63 396 362 24 340 789 341 34 56 References Cited U S PATENT DOCUMENTS 3 962 553 6 1976 Linder et 379 61 4 332 981 6 1982 Palombi et al 379 62 4 894 856 1 1990 Nakanishi et al 379 61 FOREIGN PATENT DOCUMENTS 0153342 9 1984 Japan 0229432 11 1985 Japan OTHER PUBLICATIONS Publication of Autophon s Portatel Cordless Tele phone Technical Data Sheet 379 61 379 61 11 Patent Number 45 Date of Patent 5 010 566 Apr 23 1991 Publication Universal Tote amp Talk 3400 User s Manual Primary Examiner Jin F Ng Assistant Examiner Dwayne D Bost 571 ABSTRACT A cordless telepone includes a base unit connected to a telephone line so as to communicate by radio waves for talking and a hanset The handset includes a speaker a microphone and a transmitting and receiving circuit for communicating with t
8. a proximate to the speaker is not de tected to be in contact with a user and an in service state is detected and the handset battery means for electrically powering the handset 2 The cordless telephone apparatus of claim 1 wherein the display means is a light emitting diode 3 The cordless telephone apparatus of claim 1 wherein the contact detecting means is a piezoelectric element 5 010 566 5 4 The cordless telephone apparatus of claim 1 _ wherein the handset further comprises dial means for dial input and the control means generates a dial signal in response to activation of the dial input means to initi ate or call via the base unit 5 The cordless telephone apparatus of claim 1 wherein the contact detecting means includes a penetra tion hole in an area proximate to the speaker the speaker being disposed behind the contact detecting means 6 A cordless telephone apparatus including a base unit connected to a telephone line and a handset opera tively connected to the base unit via radio communica tion and equipped with a display device for indicating an in service state of the handset the handset compris ing contact detecting means for detecting contact when U part of the body of the user contacts with an area 20 proximate to a speaker of the handset and stopping means for stopping the display device from indicating the in service state when a part of the body of the user is detected to be
9. d receiving circuit 13 amplifies and mod ulates the transmission signal received from a micro phone 14 built in the transmitter 5 It then sends out a signal from the antenna 8 and demodulates and ampli fies the reception signal sent from the base unit 23 through the telephone line 22 which is a communication circuit Finally it sends out a signal to a speaker 15 built in the receiver 6 Thus an acoustic signal is delivered from the speaker 15 Such a handset 25 is electrically powered by a built in battery 28 Referring now to FIG 3 and FIG 4 the talking action of the base unit 23 and handset 25 will be de scribed below First at step m1 in FIG 3 the talking action is started The handset 25 is unhooked from the base unit 23 by the caller at step m2 Unhooking is detected by the handset unhook detecting switch 27 At step nl in FIG 4 when the key switch 2 is oper ated and the telephone circuit 22 is connected at step n2 a drive signal is issued from the control circuit 11 to the driver 12 Further when the talk button 4 is not pressed at step n3 the operation goes to step n5 Then when the line is busy the operation advances to step n6 When the receiver 6 is not in contact with the user s ear the light emitting element 3 lights up at step 8 In this state when the user touches the receiver 6 of the handset by the ear it is detected by the piezoelectric element 7 and 10 20 25 30 35 40 45 50 35
10. e including a handset with a battery a speaker and a receiver and further including a base unit which indicates to a user when the cordless telephone is in service comprising the steps of a displaying indication on the handset of the cord less telephone in service b supplying power from the battery during said step a of displaying c detecting contact of a user to an area of the hand set in close proximity to the speaker d inhibiting said step a of displaying by stopping said step b of supplying power upon detecting contact in step c to thus conserve battery power while said telephone is in service 17 The method of claim 16 further comprising the step of terminating said step a of displaying upon said telephone not being in service 18 The method of claim 16 wherein said step c of detecting contact detects contact of a user s ear to an area of the handset in close proximity to the speaker
11. he base unit by radio waves transforming the signals from the caller into acoustic sound by the speaker and sending the output from the microphone to the caller The handset further includes a battery for providing the transmitting and receiving circuit with electric power Still further the handset includes a device for display to indicate the in service state a device for detecting the contact of the speaker area with a part of the body a device for detecting talking to detect the in service state and a device for controlling to stop the display action of the display device when the speaker area is in contact with a part of the body and is in service this stopping of the display device occurs response to the output from the contact detecting device and the talk detecting device The control device further affects the display action by the display device while the speaker area is not in contact with the body during service The handset in this de vice is electrically powered by a battery 18 Claims 4 Drawing Sheets TOUCH SENSITIVE ELEMENT U S Patent iG 23 1991 Sheet 1 of 4 5 010 566 Apr 23 1991 Sheet 2 of 4 5 010 566 U S Patent LINDUIO 7044N09 VO 1 3 3 13 9NILLINSNYYL JAILISNIS HONOLL 7 Nz 7 i LINAH 1 7 U S Patent Apr 23 1991 Sheet 3 of 4 Fig 3 m1 UNHOOKING OF HANDSET 25 DETECTE
12. imity to the speaker 10 The handset of claim 7 wherein the display means is a light emitting diode LED 11 The handset of claim 7 wherein the handset is of a C shaped configuration the speaker of the handset being in one extended portion of the C and the trans mitter being in the other extended portion of the C such that a user s ear and mouth can be simultaneously contacted to each of the respective extended portions of the C shaped configuration 12 The handset of claim 11 wherein the detecting means is a piezoelectric element disposed in close prox imity to the speaker 13 The handset of claim 12 wherein the piezoelectric element detects contact of the user s ear to the handset proximate to the speaker and outputs a signal 14 The handset of claim 7 further comprising end of service means operatively connected to said control means for outputting a signal to the con trol means to indicate that the cordless telephone is not in service and wherein said control means upon receipt of said output signal from said end of service means controls said display means to stop displaying indication of the cordless telephone being in service 15 The handset of claim 7 further comprising battery means operatively connected to said display means for providing power to enable said display means to display in service indication 16 A method of conserving power of a battery in a cordless telephon
13. ng the disconnect or hang up button on the handset after the call is complete the pilot lamp goes out In such a conventional cordless telephone the pilot lamp is usually located near the call button input key and it is not at all visible by the user if the speaker area of the handset is fitted to the ear Accordingly it is quite meaningless to always light up the pilot lamp always during call by the handset This only achieved to the battery is spent purposelessly SUMMARY OF THE INVENTION It is hence a primary object of the invention to pres ent a novel cordless telephone capable of by solving the above mentioned technical problems stopping the dis play action by the display device while the handset is in service so as to minimize the wasteful consumption of the electric power supplied from the battery or the like To achieve the above object the cordless telephone of the invention comprises a a base unit connected to a telephone line so as to communicate by radio waves for talking and b a handset comprising b1 a speaker b2 a microphone 3 a transmitting and receiving circuit for commu nicating with the base unit by radio waves trans forming the signals from the caller into acoustic sound in the speaker and sending the output from the microphone to the caller and b4 a battery for providing the transmitting and re ceiving circuit with electric power wherein c the handset further comprises cl
14. play device which includes a device for detecting contact when a part of the body of the user contacts an area proximate to the speaker and a device for stopping the display to stop the display action by the display device when a part of the body of the user is in contact with the area proximate to the speaker of the handset in response to the detection signal from the contact detecting device According to invention when the contact of a part of the body of the user with an area proximate to the speaker of the handset is detected by the contact detect ing device the display action of the display device is stopped by the display stopping device while a part of the body of the user is in contact with the area proxi mate to the speaker of the handset When the part of the body of the user is departed from the area proximate to the speaker of the handset the display action of the display device is affected again Thus according to the cordless telephone of the invention while talking as long as a part of the body of the user remains in contact with the area proximate to the handset the display action by the display device is not affected to display the in service state so that the consumption of the battery while the handset is in ser vice can be minimized BRIEF DESCRIPTION OF THE DRAWINGS These and other objects of the invention as well as the features and advantages thereof will be better un derstood and appreciated from
15. range of equivalency of the claims are therefore intended to be embraced therein What is claimed is 1 A cordless telephone apparatus including a base unit connected to a telephone line for communication and a handset operatively connected to the base unit by radio waves including a speaker a microphone a trans mitting and receiving circuit for communicating with the base unit by radio waves transforming the signals from a caller into acoustic sound by the speaker and second the output from the microphone to the caller and a battery for providing the transmitting and receiv ing circuit with electric power the handset further comprising display means for indicating an in service state of the cordless telephone activated for communication contact detecting means for detecting contact of a user with an area proximate to the speaker activation detecting means for detecting activation of the cordless telephone for communications to de tect the in service state and control means operatively connected to the display means the contact detecting means and the activa tion detecting means for controlling the display means to stop indicating an in service state when an area proximate to the speaker is detected to be in contact with a user and an in service state is de tected in response to the contact detecting means and activation detecting means and for controlling the display means to indicate an in service state when an are

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