JP2975771B2 - Electric carpet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric carpet for controlling the temperature by detecting the presence or absence of a cover.

[0002]

2. Description of the Related Art Conventionally, in this type of electric carpet, a switch for switching a set temperature according to the presence or absence of a cover is arranged in a control section, and a user judges the presence or absence of a cover and switches the switch to change the temperature of the heating element. The set value has been changed. In addition, there is an apparatus that automatically determines the presence or absence of a cover and controls the temperature instead of the user's judgment.
In Japanese Patent Application Publication No. 0-138339 (F24D 13/02), a light receiving unit for receiving external light is provided at a position covered by a cover, and when covered with a cover, light to the light receiving unit is blocked. FIG. 1 shows an apparatus that detects the presence or absence of a cover based on the presence or absence of light and automatically changes the temperature of the heating element without user's judgment.

[0003]

In the conventional electric carpet, in the former case, it is necessary for the user to manually operate a switch according to the presence or absence of the cover to switch the set temperature, which is troublesome. There is a point. In the latter case, if something other than a cover such as a cushion is placed on the case even if the cover is not actually placed, it is judged that there is a cover even though there is no cover, and a malfunction is set. There is a problem in that the temperature rises, the surface temperature of the electric carpet body becomes too high, the danger of low-temperature burns and wasteful power consumption due to malfunctions increase the electricity bill.

[0004] The present invention takes the above points into consideration, automatically judges the presence or absence of a cover, eliminates malfunctions when a cushion or the like is placed on a case, reduces the risk of low-temperature burns, and reduces malfunctions caused by malfunctions. An object of the present invention is to provide an electric carpet that prevents wasteful consumption of electric power and reduces electricity costs.

[0005]

In order to solve the above-mentioned problems, an electric carpet according to the present invention comprises an electric carpet body having a heating element, a control section for controlling the temperature of the heating element, and a main body containing the control section. A first sensor comprising a non-contact object detecting element disposed at a position not covered by the case, a case covering the main body and a part of the case, A second sensor comprising a non-contact object detection element disposed at a position to be covered; and a calculation detection unit which calculates output signals of both sensors and outputs a detection signal indicating presence / absence of a cover to a control unit. .

Further, a reflection type photo sensor is used for the first sensor and the second sensor.

[0007]

In the electric carpet of the present invention configured as described above, the first sensor composed of the non-contact object detecting element is disposed at a position not covered by the cover of the case housing the control unit, and the position covered by the cover. A second sensor composed of a non-contact object detecting element is disposed in the second case, and a calculation detection unit for calculating output signals of both sensors and outputting a detection signal of presence or absence of a cover to the control unit is provided. In this case, malfunctions caused by malfunctions are eliminated, the danger of low-temperature burns is eliminated, wasteful power consumption due to malfunctions is prevented, and electricity costs are reduced.

Further, by using the reflection type photosensors as the first and second sensors, it is possible to detect not by external light but by their own output signals.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment will be described with reference to FIGS. 1 is a heating element, 2 is an electric carpet main body having the heating element 1, 3 is a control unit having a circuit configuration as shown in FIG. A case 5 is provided at an end of the carpet body 2, and 5 is an electric carpet body 2 and a case 4.
Is a first sensor composed of a non-contact object detecting element arranged at a position not covered by the cover 5 of the case 4, and 7 is arranged at a position covered by the cover 5 of the case 4. The second sensor 8 composed of a non-contact object detecting element is a temperature setting volume for adjusting the temperature of the heating element 1 according to the user's preference, and is provided on the side of the case 4 not covered by the cover 5.

Next, the circuit configuration will be described. 9 is a power supply, 10 is a relay contact, and the heating element 1 is a relay contact 1.
0 is connected to the power supply 9 in series. Reference numerals 11 and 12 denote first and second CdSs built in the first and second sensors 6 and 7, respectively, which have a small resistance value when light is being irradiated, and the sensors 6 and 7 output "H" signals. And when the light is blocked, the resistance value is large, and the sensors 6 and 7 output an “L” signal. That is, the first sensor 6 outputs an "H" signal in a normal use state, and outputs an "L" signal in an abnormal state where a cushion or the like is placed. The second sensor 7 outputs an “H” signal when the cover 5 is not mounted, and outputs an “L” signal when the cover 5 is mounted.

Numeral 13 denotes an operation detecting section. As shown in Table 1, when the output signal of the first sensor 6 is "H", it is judged that the presence or absence of the cover 5 can be detected, and the second sensor 6 If the output signal of the first sensor 6 is “H”, it is determined that “no cover”, and if the output signal of “L” is “cover”, the output signal of the first sensor 6 is “L”. Irrespective of the condition, it is determined that the detection of the presence or absence of the cover 5 is impossible, that is, "error". Reference numeral 14 denotes a temperature setting circuit.
, The set value set by the temperature setting potentiometer 8 is corrected based on the detection signal, and a corrected signal is output. Reference numeral 15 denotes a temperature controller which opens and closes the relay contact 10 so as to be suitable for the correction signal of the temperature setting circuit 14 and controls the current to the heating element 1.

The control section 3 comprises a temperature setting volume 8, a relay contact 10, a temperature setting circuit 14, and a temperature control section 15.

First, the operation when the cover 5 is not provided in a normal use state will be described. When the user sets a desired temperature with the temperature setting volume 8 in advance and the power supply 9 is turned on, the heating element 1 starts generating heat. At this time, the output signals of the first and second sensors 6 and 7 are both “H”, and the calculation detection unit 13 determines that the cover 5 is not present, and outputs a detection signal. The temperature setting circuit 14 is provided by the detection signal.
Does not modify the settings. Therefore, the temperature of the heating element 1 is controlled by opening and closing the relay contact 10 so as to be suitable for the set value of the temperature setting volume 8 by the temperature control unit 15.

Next, a case where the cover 5 is present in a normal use state will be described. As described above, the user sets a desired temperature using the temperature setting knob 8, and the heating element 1 starts generating heat. At this time, the output signal of the first sensor 6 is “H” and the output signal of the second sensor 7 is “L”, and the calculation detection unit 13 determines that the cover 5 is present, and outputs a detection signal.

According to the detection signal, the temperature setting circuit 14 corrects the set value to a higher value and outputs the corrected signal. The temperature control unit 15 controls the temperature of the heating element 1 by opening and closing the relay contact 10 so as to be suitable for the correction signal.

Next, an operation in an abnormal state, that is, when an object such as a cushion is placed on the case 4 will be described. In this case, since the output signal of the first sensor 6 is “L”,
Regardless of the output of the sensor 7, the operation detection unit 13
The temperature setting circuit 14 determines that the detection of the presence or absence of the cover 5 is impossible, that is, an error state, and notifies the user that the cover 5 cannot be detected by the buzzer without correcting the set value.

At this time, at the same time as sounding the buzzer,
The set value is corrected to be rather low by the temperature setting circuit 14,
Prevent temperature rise. Note that the first and second CdS11,
Instead of 12, a photoelectric conversion element such as a photodiode may be used.

The method of correcting the set value after the determination by the operation detection unit 13 is not limited to this, and may be performed by the temperature control unit 15. Further, a detection signal transmitting unit such as an infrared LED may be arranged at a position not covered by the cover 5.

Next, as another embodiment, a case where a reflection type photosensor is used for the first and second sensors 6 and 7 will be described. In this case, the object can be detected not by external light but by its own output signal, and the detection state of the presence or absence of the cover 5 can be more accurately determined.

[0020]

Since the present invention is configured as described above, it has the following effects. The electric carpet of the present invention has a case 4 in which the control unit 3 is housed.
A first sensor 6 composed of a non-contact object detection element is arranged at a position not covered by the cover 5, and a second sensor 7 composed of a non-contact object detection element is arranged at a position covered by the cover 5. 7 is provided to calculate the output signal of 7 and output a detection signal indicating the presence / absence of the cover 5 to the control unit 3. This eliminates a malfunction when a cushion or the like is placed on the case 4 and may cause a risk of low-temperature burns. Can be prevented, and wasteful power consumption due to malfunction can be prevented, and the electricity cost can be reduced.

Further, when the first and second sensors 6 and 7 are reflection type photosensors, they can be detected not by external light but by their own output signals.

[Brief description of the drawings]

FIG. 1 is an enlarged perspective view of a part of one embodiment of the present invention.

FIG. 2 is a circuit diagram of one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating element 2 Electric carpet main body 3 Control part 4 Case 5 Cover 6 1st sensor 7 2nd sensor 15 Calculation detection part

[Table 1]

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Naohiko Kishimoto 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori Sanyo Electric Co., Ltd. (72) Inventor Mitsuru Matsumoto 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori Sanyo Electric Co., Ltd. (58) Field surveyed (Int.Cl. ⁶ , DB name) F24D 13/02 H05B 3/00 355 H05B 3/00 365

Claims (2)

(57) [Claims] An electric carpet body having a heating element;
A control unit that controls the temperature of the heating element, a case that houses the control unit and is provided at an end of the main body, a cover that partially covers the main body and the case, and the cover of the case. A first sensor composed of a non-contact object detecting element disposed at a position not covered by the sensor, a second sensor composed of a non-contact object detecting element disposed at a position covered by the cover of the case, and outputs of the two sensors; An electric carpet, comprising: an operation detection unit that calculates a signal and outputs a detection signal indicating the presence or absence of the cover to the control unit. 2. The electric carpet according to claim 1, wherein the first sensor and the second sensor are reflection-type photo sensors.