as shown in fig1 a far infrared heating apparatus is provided with a far infrared radiator 1 . as shown in fig2 the far infrared radiator 1 comprises a heating wire 4 wound around a tubular ceramic bobbin 2 and the exterior surfaces thereof are coated with a ceramic 6 . when the heating wire 4 is heated by the current flowing therethrough , the far infrared radiator 1 radiates far infrared rays having a wavelength of about 4 microns or more the far infrared radiator 1 , to which a reflective shade 8 is attached , is accommodated within a top housing 10 the top housing 10 is secured to a base 12 by a flexible support 14 . a control circuit 16 is contained within the base 12 and coupled to the far infrared radiator by at least one wire ( not shown ). the control circuit 16 controls heating of the heating wire 4 by connecting / disconnecting the power supply to the heating wire 4 . as schematically illustrated in fig3 the control circuit 16 comprises a cpu 31 for controlling the radiation process , a rom 32 for storing main control programs and the like , a ram 33 for temporarily storing information , including the control conditions set by an operation section 35 , and an input / output interface 34 for conveying data and information between those components and the radiator 1 and a temperature sensor 20 . all of these components are connected to communicate with one another by means of a communication bus 36 . the radiation process has the feature that radiation is performed intermittently to control the radiation , two modes of operation , namely , a timer control process and a sensor control process , are available and a user selects one of the two modes of operation via an operation section 35 . when the user chooses the timer control process , the user also presets the control conditions , such as a total intermittent connecting time and a connecting cycle . the total intermittent connecting time here means the total time , 20 minutes or 30 minutes for example , during which the current is intermittently supplied to the far infrared radiator 1 for use in the radiation process , the connecting cycle consists of a connecting time , during which the current to the far infrared radiator 1 is “ on ” and a disconnecting time during which the current is “ off ”. both the connecting time and the disconnecting time are set for 1 to 3 minutes , for example . when the user chooses the sensor control process , the user also presets the control conditions , such as a maximum temperature and a disconnecting time , via the operation section 35 . the maximum temperature here means the upper limit of temperature for the object to be heated 18 . and the disconnecting time means the time period during which the current supplied to far infrared radiator 1 is “ off ”. the cpu 31 detects the preset state of the operation section 35 , and stores the data indicating the preset control conditions in the ram 33 . then , the cpu reads the data ind executes the control programs stored in rom 32 . the specific processes performed by cpu 31 will be explained hereinafter with reference to fig4 through 6 . as shown in fig4 when the power supply is turned “ on ”, the cpu 31 in the control circuit 16 determines whether or not the process mode is set for the timer control process ( step 100 ). if it is determined that the timer control process has been selected , the timer control process is performed ( step 200 ). if it is determined that the sensor control process has been selected , the sensor control process is performed ( step 300 ). in the timer control process , as shown in fig5 the cpu 31 firstly reads a predetermined total intermittent connecting time stored in ram 32 ( step 210 ). secondly , the cpu 31 also reads a predetermined connecting cycle during which the current to the far infrared radiator 1 is intermittently “ on ” ( step 220 ). thirdly , it is determined whether or not the predetermined total intermittent connecting time , read at step 210 , has elapsed ( step 230 ). if it is determined that the predetermined total intermittent connecting time has not elapsed , the current to far infrared radiator 1 is turned “ on ” ( step 240 ). then , far infrared rays are radiated from the far infrared radiator 1 toward the object to be heated 18 . next , it is determined whether or not a predetermined connecting time has elapsed ( step 250 ). if it is determined that the predetermined connecting time has not elapsed , the current to the far infrared radiator 1 is kept “ on ”. if it is determined that the predetermined connecting time has elapsed , the current to the far infrared radiator 1 is shut “ off ” ( step 260 ). in turn , it is determined whether or not a predetermined disconnecting time has elapsed ( step 270 ). if it is determined that the predetermined disconnecting time has not elapsed , the current is kept “ off ”. if it is determined that the predetermined disconnecting time has elapsed , the processes returns to step 230 and repeats the process . thus , the far infrared radiator 1 radiates far infrared rays toward the object to be heated 18 during the connecting time , while the radiation is prevented from radiating far infrared rays toward the object to be heated 18 during the disconnecting time . since heating during the connecting time and the stopping of heating during the disconnecting time are repeated by the far infrared radiator 1 , the object to be heated 18 repeatedly undergoes heating and cooling . the object to be heated 18 ( e . g the user ) feels this as a fluctuation in heat so that the user can continue undergoing treatment comfortably without becoming used to the thermal stimulation . when it is determined , at step 230 , that the predetermined total intermittent connecting time has elapsed , the current is shut “ off ” and the control process ends . when it is determined , at step 100 , that the sensor control process has been selected , the cpu 31 firstly reads , as shown in fig6 a predetermined maximum temperature of the object to be heated 18 which is stored in the ram ( step 310 ). secondly , a predetermined intermittent connecting time is read ( step 320 ) in the same manner as the aforementioned step 210 . thirdly , a predetermined disconnecting time is read ( step 330 ). then it is determined whether or not the predetermined intermittent connecting time has elapsed ( step 340 ). if it is determined that the predetermined intermittent connecting time has not elapsed , the current to the far infrared radiator 1 is turned “ on ” ( step 350 ). as a result , far infrared rays are radiated from the far infrared radiator 1 . subsequently , it is determined whether or not the temperature detected by the temperature sensor 20 has reached the maximum temperature ( step 360 ), which maximum temperature was read at step 310 . if it is determined that the sensed temperature has not reached the maximum temperature , the process returns to step 340 and the current to the far infrared radiator 1 is kept “ on ” the entire time if it is determined that the sensed temperature has reached the maximum temperature , the current to the far infrared radiator 1 is shut “ off ” ( step 370 ). it is then determined whether ( step 380 ) or not the predetermined disconnecting time , read at step 330 , has elapsed and the current to the far infrared radiator 1 is kept “ off ” during the disconnecting time . when it is determined that the predetermined disconnecting time has elapsed , the processes returns to and repeats step 340 . that is , the current to the far infrared radiator 1 is kept “ on ” until the temperature of the object to be heated 18 has reached the maximum temperature and , when it has reached the maximum temperature , heating is again stopped during the predetermined disconnecting time . when it is determined , at step 340 , that the predetermined total intermittent connecting time has eventually elapsed , the current is shut “ off ” and the control process ends . as aforementioned , the object to be heated 18 is heated until its temperature has reached the maximum temperature , cooled by stopping the heating for a predetermined disconnecting time , and then heated again after the predetermined disconnecting time has elapsed until its temperature again reaches the maximum temperature . the object to be heated 18 ( the user ) feels this as “ fluctuation ” in heat , so that the user can continue undergoing treatment comfortably without becoming used to the thermal stimulation . instead of the above described computer - controlled system , a relatively simple control circuit 16 , shown in fig7 may be employed as a control means of the present invention . specifically , the control circuit 16 comprises a timer circuit 40 which performs the above described timer control process and a sensor circuit 50 which performs the above described sensor control process . a common timer such as an electromagnetic timer may be used in the timer circuit 40 . in the sensor circuit 50 , a thermistor may be connected as the temperature sensor 20 . in this case , the current supplied to the radiator 1 can be turned “ on / off ” in accordance with the resistance value of the thermistor . in one case where the above timer control process is selected by a setting means 60 , a power switch sw 1 is turned “ on ” and a selector switch sw 2 is connected to the channel by - passing the sensor circuit . then the timer circuit 40 turns the supply of current to the radiator 1 “ on / off ” in accordance with an total intermittent connecting time , a connecting cycle , and the like which are all predetermined by the setting means 60 . in another case where the above sensor control process is selected by the setting means 60 , the power switch sw 1 is turned “ on ” and the selector switch sw 2 is connected to the channel through the sensor circuit . in the sensor circuit 50 , when the temperature sensor 20 , attached to the object to be heated 18 , senses a predetermined maximum temperature , the current supplied to the radiator 1 is automatically shut “ off ”. then , once the temperature sensor 20 senses a predetermined minimum temperature , the current supply to the radiator 1 is again turned “ on ”. the intermittent connection to the radiator 1 is performed in this manner . in this case , timer circuit 40 counts a predetermined total intermittent connecting time set by the setting means 604 and shuts “ off ” the supply of current to the radiator 1 once the predetermined total intermittent connecting time has elapsed . as described above , employment of the simple control circuit 16 can lead to the same effects as the aforementioned system with lower costs . the invention is not restricted to the above described embodiment and may be embodied in various forms without departing from the spirit and the scope of the invention .
a far infrared heating methods to facilitate a user receiving continued comfortable thermal stimulation . the far infrared heating method , are provided with a temperature sensor for attachment to the object to be heated , and when the temperature detected by the temperature sensor has reached a predetermined maximum temperature , the radiation from the far infrared radiator is stopped . furthermore , the user can switch to a timer control mechanism which causes the far infrared radiator to radiate intermittently during a predetermined time cycles .