JP3384361B2 - Electric cooker - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an electric cooker used in general households.

[0002]

2. Description of the Related Art A conventional electric cooker will be described below with reference to FIG. FIG. 4 is a block diagram of a conventional electric cooker. In FIG. 4, 1 is a commercial power source, 2 is a cooking plate, 3 is a heating means which is a heat source for heating the cooking plate 2 including a heater, and 4 is a heating control means which is composed of a relay 41, a transistor Q41, a resistor and the like. ing. Reference numeral 5 is a power supply circuit that outputs a predetermined direct current voltage from the commercial power supply 1, 6 is a constant voltage circuit that steps down the direct current voltage that is input from the power supply circuit 5, and outputs 7, 7 is a temperature sensing device that detects the temperature of the cooking plate 2. An element, 8 is a control circuit, which is based on a signal input from the temperature sensitive element 8 and is a transistor Q4 of the heating control means 4.
By controlling ON / OFF of 1, the contacts of the relay 41 are opened / closed to control the energization of the commercial power source 1 and the heating means 3,
The cooking plate 2 is controlled so as to maintain a predetermined temperature.
93 is a safety switch, and when the cooking plate 2 is installed in the equipment, the contact is turned on and the commercial power supply 1 is connected to the heating means 3 via the power supply circuit 5 and the heating control means 4. That is, when the cooking plate 2 is not installed in the equipment, the contact point of the safety switch 93 is turned off, so that the power supply to the heating means 3 is mechanically cut off and the power supply to the commercial power supply 1 and the power supply circuit 5 is cut off. Heating control means 4 and control circuit 8
To ensure the safety of the equipment by stopping the operation and making it impossible to heat.

[0003]

However, in the above-mentioned conventional configuration, the safety switch 93 has a relatively high AC voltage of the commercial power source 1 and a relatively large current based on the electric power of the heating means 3 flows through the contact point of the safety switch 93. The structure of 93 becomes large and the cost becomes high.

In addition, when the safety switch 93 is installed on the printed wiring board, a considerably large installation area is required, and an additional area is required to ensure the insulation distance.

Further, when the contact of the safety switch 93 is off, the commercial power supply 1 and the power supply circuit 5 are de-energized, so that the heating control means 4 and the control means 8 stop operating and the control means 8 informs. Cooking plate 2 by controlling means etc.
Since it is not installed, it is not possible to notify that heating is not possible, and there is no way for the person who uses the device to know the reason why heating is not possible.

Further, when the control means 8 is constituted by a microcomputer or the like, the capacitor C51 or C is provided so that the microcomputer will not be reset even if the cooking plate 2 is accidentally detached from the device and immediately reinstalled.
It is necessary to make the capacitance of 61 relatively large, which causes a problem that the cost increases and the area of the printed wiring board increases.

The present invention solves the above-mentioned conventional problems, and an object thereof is to secure the safety when the cooking plate is not installed, and to reduce the area of the printed wiring board with an inexpensive structure. . Moreover, it aims at making a some cooking plate identifiable. Another object is to reduce the number of input signals to the control means and simplify the configuration of the device.

[0008]

In order to solve the above-mentioned problems, the present invention provides a heating means for heating a cooking plate, a heating control means for controlling energization of the heating means, and a drive power source for the heating control means. A power supply circuit, a switch having at least a common terminal, a normally closed terminal that is in a closed state with the common terminal when the operation is off, and a normally open terminal that is in an open state with the common terminal when the operation is off, and an input signal from the switch. Control means for controlling the heating control means based on the above, the common terminal of the switch is connected to one output terminal of the power supply circuit, and either one of the normally open terminal and the normally closed terminal of the switch is heated. One of the control means is connected to the power input terminal, and the other is connected to the control means.
, The other output terminal of the power supply circuit is connected to the other power supply input terminal of the heating control means, and when the cooking plate is installed, the switch operates and power is supplied from the power supply circuit to the heating control means. The electric cooker is configured as described below.

With this configuration, when the cooking plate is not installed in the equipment, the power supply from the power supply circuit to the heating control means is mechanically cut off to ensure the safety of the equipment even when the control means malfunctions. You can

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 includes at least heating means for heating a cooking plate, heating control means for controlling energization of the heating means, and a power supply circuit serving as a drive power source for the heating control means. A switch having a common terminal, a normally-closed terminal that is in a closed state with the common terminal when the operation is off, and a normally-opened terminal that is in an open state with the common terminal when the operation is off, and the heating control means based on an input signal from the switch. And a control means for controlling the common terminal of the switch is connected to one output terminal of the power supply circuit,
One of normally open terminals or always closed terminal of said switch is connected to one power supply terminal of said heating control means, and to connect the other side to said control means, said other output terminal of said power supply circuit Since the electric cooker is configured to be connected to the other power input terminal of the heating control means and to install the cooking plate to activate the switch to supply power to the heating control means from the power supply circuit. When the plate is installed on the equipment, the switch is turned on and the common terminal of the switch and the normally open terminal are connected, and the normally open terminal of the switch is connected to one power input terminal of the heating control means and the normally closed terminal is connected. By inputting to the control means, the control means detects the operation on / off state of the switch based on the input signal from the normally closed terminal of the switch and detects the cooking pre-condition. It is possible to detect whether the cooking plate is installed in the equipment or not, and when the cooking plate is not installed in the equipment, the switch is turned off and the common terminal of the switch and the normally open terminal are not connected, and the power circuit Therefore, the power supply to the heating control means can be mechanically cut off to ensure the safety of the device even when the control circuit malfunctions.

The switch is DC 30V or less and DC
Since the relatively small voltage and current required for driving the heating control means of 100 mA or less are applied, the switch structure can be made small, the cost of the switch can be kept low, and the switch can be installed on the printed wiring board. ,
The switch installation area and insulation distance can be reduced.

Further, when the power supply circuit inputs from a commercial power supply and outputs a predetermined DC voltage and the heating control means and the control means use the output of the power supply circuit as the drive power supply, the cooking plate is installed in the equipment. Even when the switch is turned off, the connection between the power supply circuit and the commercial power supply is continued, so that the control means can operate and the cooking plate is installed in the equipment based on the input signal from the normally closed terminal of the switch. When the cooking plate is not installed in the device by detecting that there is no cooking plate, it is possible to notify that the cooking plate cannot be heated.

Further, even when the switch is off, the power supply circuit inputs from a commercial power supply and outputs a predetermined DC voltage, and the control circuit can operate using the output of the power supply circuit as a drive power supply. In the case where the control means is configured by a microcomputer or the like, the cooking plate is abruptly removed from the device as compared with a configuration in which the commercial power supply and the power supply circuit are mechanically cut off when the cooking plate is not installed. A backup capacitor for preventing the microcomputer from resetting even if the microcomputer is removed and re-installed as it is is not necessary, and the cost and the printed wiring board area can be suppressed.

According to a second aspect of the present invention, a plurality of cooking plates are provided, a plurality of switches corresponding to the plurality of cooking plates are provided, and at least one of the plurality of switches is installed when a predetermined cooking plate is installed. Since the electric cooker according to claim 1 is configured to operate and identify the type of the cooking plate installed, the control means determines the type of the cooking plate installed based on the input signals from the plurality of switches. The cooking plate installed in the device is a cooking plate having a groove structure suitable for yakiniku cooking (hereinafter referred to as a yakiniku plate) or a flat cooking plate suitable for yakisoba / okonomiyaki cooking (hereinafter a flat plate). It is called a plate) and is adjusted by the temperature and cooking algorithm suitable for the cooking content of each cooking plate. It can be carried out.

Further, the control means, for example, holds different set temperatures for the BBQ plate and the flat plate, or holds the same set temperature for the BBQ plate and the flat plate, respectively. It is possible to set the temperature corresponding to each cooking plate of the plate and the flat plate.

[0016]

EXAMPLE 1 Example 1 of the present invention will be described below with reference to FIG. FIG. 1 is a block diagram of an electric cooker according to a first embodiment of the present invention. In this embodiment, those having the same functions as those of the conventional example shown in FIG. The characteristic configuration of this embodiment is as follows.

First, in place of the safety switch 93, a first switch 91 and a second switch 92 each composed of a micro switch or the like are provided, and a common terminal (hereinafter COM) of the first switch 91 and the second switch 92 is provided. Terminal) and the + output terminal of the power supply circuit 5, both of which are normally open circuit terminals (hereinafter N
(Referred to as O terminal) are both connected to the + input terminal of the heating control means 4, and the − input terminal of the heating control means 4 is connected to the − of the power supply circuit 5.
Connect to the output terminal.

Further, the normally closed terminals (hereinafter, referred to as NC terminals) of the first switch 91 and the second switch 92, which are in a closed state with the COM terminal when the operation is off, are respectively the resistor R91 and the capacitor C91, or the resistor. The signal is input by connecting to the control means 8 via the R92 and the capacitor C92.

In the heating control means 4, when both the first switch 91 and the second switch 92 are off,
A diode D41 is added to the control means 8 in order to prevent a voltage lower than the potential at the output terminal of the constant voltage power supply 6 from being applied, and the leakage current of the transistor Q41 and the diode D41 causes the control means 8 to supply the negative voltage to the control means 8. A resistor R44 having a relatively large resistance value is added to prevent a voltage lower than the potential of the output terminal from being applied.

Further, the input means 10 composed of a tact switch or the like is newly provided, and the drive control of the heating control means 4 is started and stopped based on the signal inputted from the input means 10 by the control means 8.

Further, a control means 8 is additionally provided with a notification means 11 comprising a light emitting diode (hereinafter referred to as an LED), a buzzer, etc., for notifying that the cooking plate 2 cannot be heated because it is not installed in the equipment. Drives and controls the notification means 11.

When a grill plate, which is a cooking plate having a groove structure suitable for grilling meat, is installed in the equipment,
The switch 91 is turned on and the second switch 92 is turned on when a flat plate, which is a flat cooking plate suitable for yakisoba or okonomiyaki cooking, is installed in the device.

The operation of the electric cooker configured as described above will be described below.

First, the case where the cooking plate 2 is not installed in the equipment will be described. At this time, the first switch 9
Both the first and second switches 92 are turned off, the first switch 91 and the second switch 92 are both in the state where the COM terminal and the NC terminal are connected, and the + output terminal of the power supply circuit 5 and the heating control means. The + input terminal of 4 is mechanically cut off.

Further, by connecting the COM terminal and NC terminal of the first switch 91, the input signal V1 to the control means 8 becomes an "H" signal via the resistor R91, and the COM terminal of the second switch 92 and NC. By connecting the terminals, the input signal V2 to the control means 8 becomes the "H" signal through the resistor R92. Note that C91 and C92 are noise-proof capacitors. Then, the control means 8 detects that the cooking plate 2 is not installed in the equipment because the input signal V1 from the first switch 91 and the input signal V2 from the second switch 92 are both "H" signals. To do.

With the above configuration, the cooking plate 2
If the control means 8 malfunctions and a signal for turning on the relay 41 of the heating control means 4 is applied to the transistor Q41, the relay 41 does not turn on the contact, and burns, fire, etc. It is possible to avoid the danger of and secure the safety of the equipment.

The first switch 91 and the second switch 92 are both relatively small voltage and current for driving the relay 41 of about 0.2 W to 0.4 W which is a constituent element of the heating control means 4. Is applied, DC3
It is possible to use low rated products of 0V and DC0.1A, which reduces the cost of the switch, and when the switch is installed on the printed wiring board, the switch structure is made smaller to reduce the installation area and DC30V. By applying the following, it is possible to reduce the insulation distance to be secured and reduce the area of the printed wiring board.

Further, even if the person who uses the device applies the commercial power supply 1 to the device and operates the input means 10 to start heating,
The control means 8 does not turn on the relay 41 of the heating control means 4 and controls the notification means 11 so that the person who uses the equipment does not install the cooking plate 2 by blinking the LED or buzzing the buzzer. It is possible to make a notification to the effect that it is not possible.

Further, as compared with the conventional example shown in FIG.
Since the power supply circuit 5 outputs a predetermined DC voltage even when both the switch 91 and the second switch 92 are turned off, the capacities of the backup capacitors C51 and C61 when the control means 8 is composed of a microcomputer or the like are set. The size and the printed wiring board area can be reduced.

Further, for example, when the control means is composed of a microcomputer or the like, a backup capacitor is required so that the microcomputer does not reset even if the cooking plate is accidentally removed from the device and immediately reinstalled. Therefore, the cost and the area of the printed wiring board can be suppressed.

Next, the case where the grilled meat plate is installed on the equipment as the cooking plate 2 will be described. At this time,
The first switch 91 is activated to turn on the first switch 91.
The COM terminal and the NO terminal are connected, and the + output terminal of the power supply circuit 5 and the + input terminal of the heating control means 4 are mechanically connected.

Further, by opening the COM terminal and NC terminal of the first switch 91, the input signal V1 to the control means 8 becomes the "L" signal via the resistor R91. Then, in the control means 8, the input signal V1 from the first switch 91 is "L".
Since it is a signal, it detects that the grilled meat plate is installed in the equipment.

Next, the case where the flat plate is installed on the equipment as the cooking plate 2 will be described. At this time, the second switch 92 is activated and the COM terminal and the NO terminal of the second switch 92 are connected,
The + output terminal of the power supply circuit 5 and the + input terminal of the heating control means 4 are mechanically connected.

Further, by opening the COM terminal and NC terminal of the second switch 92, the input signal V2 to the control means 8 becomes an "L" signal via the resistor R92. Then, in the control means 8, the input signal V2 from the second switch 92 is "L".
Since it is a signal, it detects that the flat plate is installed in the device.

With the above-mentioned configuration, the cooking plate 2
When a roasted meat plate or a flat plate is installed in the equipment as above, the first switch 91 or the second switch 92 is activated to mechanically connect the power supply circuit 5 and the heating control means 4, and the control means 8 is the heating control means. 4 transistor Q
It is possible to energize the heating means 3 by turning on the contact of the relay 41 by turning on 41.

The control means 8 has a first switch 91.
When the input signal V1 from the switch is the "L" signal, the grill plate is installed in the device, and when the input signal V2 from the second switch 92 is the "L" signal, the flat plate is installed in the device. Based on the input signals V1 and V2 from the first switch 91 and the second switch 92, the type of the cooking plate 2 installed in the device can be identified.

That is, the control means 8 sets the maximum set temperature to 230 ° C. assuming the grilled meat cooking when the grilled meat plate is installed in the equipment, and raises the grilled meat plate temperature at the completion of preheating to 260 ° C. The cooking performance at the start of cooking is improved, and when the flat plate is installed in the equipment, the maximum set temperature is set to 250 ° C. in consideration of yakisoba cooking, and the heating control means 4 is controlled during preheating. The power supply to the heating means 3 is controlled to be turned on / off to suppress the overshoot of the flat plate temperature, and 250
Cooking can be performed with a temperature and a cooking algorithm suitable for the cooking content of each cooking plate, such as enabling the start of yakisoba cooking near ℃.

Further, the control means 8 holds three set temperatures when the roasted meat plate is installed in the equipment, and holds five set temperatures when the flat plate is installed in the equipment. It is possible to maintain different set temperature numbers for the grilled meat plate and the flat plate.

Further, the control means 8 controls, even when both the grilled meat plate and the flat plate hold five preset temperatures,
For Yakiniku plate, set each temperature to 230 ℃, 195
℃, 160 ℃, 125 ℃, 90 ℃, in the case of a flat plate, each set temperature is 250 ℃, 200 ℃, 180 ℃, 1
Each set temperature can be independently maintained at the optimum temperature for each cooking plate such as 40 ° C. and 90 ° C. by the grill plate and the flat plate.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to FIG. FIG. 2 is a block diagram of an electric cooker according to a second embodiment of the present invention. The characteristic configuration of the present embodiment is that the output signals from the NC terminals of the first switch 91 and the second switch 92 are transferred to resistors R93 and R9.
4, and is converted into an analog signal via R95 and input to the control means 8. Note that C93 is a noise-proof capacitor.

The operation of the electric cooker configured as described above will be described with reference to FIG. FIG. 3 is a diagram showing the correlation between the operation switch and the voltage level of the analog signal. The voltage output from the constant voltage circuit 6 is set to DC.
5.0V, R93 = 910Ω, R94 = 1600
Ω and R95 = 1800Ω.

First, when both the first switch 91 and the second switch 92 are off, the COM terminal and the NC terminal of the first switch 91 and the C terminal of the second switch 92.
Since both the OM terminal and the NC terminal are connected, the analog signal VAIN input to the control circuit 8 becomes a voltage divided by (parallel resistance of R93 and R94) and R95, and the resistance value variation of 5% is taken into consideration. 69V ~ 3.78V ~
The voltage is 3.87V.

When the first switch 91 is turned on, the COM terminal and the NC terminal of the first switch 91 are cut off and the COM terminal and the NC terminal of the second switch 92 are connected to each other. Analog signal VAIN
Becomes a voltage divided by R94 and R95, and 2.52V to 2.65V to 2.65V considering resistance value variation of 5%.
The voltage is 77V.

When the second switch 92 is turned on, the COM terminal and the NC terminal of the first switch 91 are connected and the COM terminal and the NC terminal of the second switch 92 are cut off. Analog signal VAIN
Becomes a voltage divided by R93 and R95, and 3.21V to 3.32V to 3.32V in consideration of the resistance value variation of 5%.
The voltage is 43V.

Then, the control means 8 has the first switch 9
According to the voltage level of the analog signal VAIN input from the first and second switches 92, as shown in FIG.
It is divided into two areas.

That is, the first switch 91 and the second switch
Both switches 92 are in the off state 3.56V
Region 1 of ≤ VAIN, only second switch 92 is in the operation on state 2.99V ≤ VAIN <3.56V region 2, only first switch 91 is in the operation on state 2.3
Region 3 of 0V ≦ VAIN <2.99V, and region 4 of VAIN <2.30V in which the first switch 91 and the second switch 92 are both in the operation-on state.

Therefore, the control means 8 controls the first switch 91 based on whether the voltage level of the analog signal VAIN input from the first switch 91 and the second switch 92 is one of the regions 1 to 4. And the operation | movement on-off state of the 2nd switch 92 can be detected.

With the above configuration, when the first switch 91 and the second switch 92 and the control means 8 are arranged at relatively distant positions, the first switch 91 is arranged.
Also, the number of wires from the second switch 92 to the control means 8 can be reduced from two to one, and the wiring cost and the number of wiring steps can be reduced. When the first switch 91, the second switch 92, and the control means 8 are arranged on the same printed wiring board and the control means 8 is composed of a microcomputer, the input port to the microcomputer is By reducing the number from two to one, the cost of the microcomputer can be suppressed, the size of the microcomputer can be reduced, and the area of the printed wiring board can be reduced.

In the first and second embodiments and the conventional example, the + output terminals of the power supply circuit 5 and the constant voltage power supply 6 are respectively connected to one output of the commercial power supply 1, but not connected. Is also possible.

Further, the + output terminal of the power supply circuit 5 and the + output terminal of the constant voltage power supply 6 have the same potential, but the − output terminal of the power supply circuit 5 and the − output terminal of the constant voltage power supply 6 have the same potential. Even with this configuration, the same effect can be obtained by changing the layout of the first switch 91, the second switch 92, and the components that make up the heating control means 4.

The constant voltage circuit 6 is configured to step down and output the DC voltage input from the power supply circuit 5. However, the constant voltage circuit 6 receives the commercial power supply 1 and outputs a predetermined DC voltage. When the circuit 6 is independent, the power supply capacity of the power supply circuit 5 can be reduced while the same effect can be obtained, and the configuration of the power supply circuit 5 can be simplified.

Further, the resistor R43, which is a component of the heating control means 4, applies the voltage applied to both ends of the relay 41 coil when the contact of the relay 41 is held ON.
Applied voltage value (hereinafter referred to as holding voltage) required to keep the contact of the relay on and held, thereby suppressing the current consumption of the relay 41 and suppressing the power supply capability of the power supply circuit 5 and reducing the relay 4
This is because the self-heating of the capacitor C41 is suppressed.
When the transistor Q41 is off, the output voltage of the power supply circuit 5 is charged, and when Q41 is turned on, it is discharged with the time constant of C41 and (coil resistance of relay 41 + R43), and the contact of the relay 41 is turned on. This is to secure a required applied voltage value (hereinafter referred to as "sensing voltage. Holding voltage <sensing voltage") for a necessary time (several tens of ms), but the same effect can be obtained even in a configuration without these components. .

The Zener diode ZD41, which is a component of the heating control means 4, protects Q41 from the counter electromotive voltage generated across the coil of the relay 41 when the transistor Q41 is turned on and off. It doesn't matter.

The output of the power supply circuit 5 is changed to the heating control means 4
The heating control means 4 and the control means 8 are driven with different voltage values by using the output of the constant voltage circuit 6 as the driving power supply of the control means 8 and the heating control means 4 and When the control means 8 is driven, the constant voltage circuit 6 can be eliminated and the configuration of the device can be simplified while obtaining the same effect.

In the first and second embodiments, the N of the first switch 91 and the second switch 92 is N.
Although the O terminals are both connected to the + input terminal of the heating control means 4, the first switch 91 and the second switch 92 are connected.
It is also possible to connect both of the NO terminals to the negative input terminal of the heating control means 4.

Further, although the first switch 91 or the second switch 92 is activated when the cooking plate 2 is installed in the equipment, the first switch 91 or the second switch 92 is turned on when the cooking plate 2 is not installed in the equipment. The switch 91 and the second switch 92 are turned on, and the NC terminals of the first switch 91 and the second switch 92 are connected to the input terminal of the heating control means 4 and the NO terminal is input to the control means 8. It is also possible to

Further, the cooking plate 2 is described as two types such as a grill plate and a flat plate, but the number of switches is increased for three or more types,
The same effect can be obtained by utilizing the simultaneous operation ON of a plurality of switches.

[0058]

As described above, according to the first aspect of the present invention, when the cooking plate is not installed in the equipment, the power supply from the power supply circuit to the heating control means is mechanically cut off to control means. It is possible to ensure the safety of the device even in case of malfunction of the device. Further, the cost of the switch can be reduced by reducing the structure of the switch, and when the switch is installed on the printed wiring board, the installation area and insulation distance of the switch can be reduced to reduce the area of the printed wiring board.

According to the second aspect of the present invention, the control means discriminates whether the cooking plate installed in the equipment is a roasted meat plate or a flat plate, and determines the contents of cooking to be performed by each cooking plate. Even if cooking is performed with an appropriate temperature and cooking algorithm, different set temperatures are set for the BBQ plate and the flat plate, or even if the BBQ plate and the flat plate both have the same set temperature Can be set to a temperature corresponding to each cooking plate of the grilled meat plate and the flat plate.

[Brief description of drawings]

FIG. 1 is a block diagram of an electric cooker according to a first embodiment of the present invention.

FIG. 2 is a block diagram of an electric cooker according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a correlation between an operating switch and a voltage level of an analog signal.

FIG. 4 is a block diagram of an electric cooker having a conventional configuration.

[Explanation of symbols]

1 Commercial power supply 2 cooking plate 3 heating means 4 Heating control means 5 power supply circuit 6 constant voltage circuit 7 Temperature sensor 8 Control means 91 First switch 92 Second switch 10 Input means

Continuation of the front page (56) Reference JP-A-5-261024 (JP, A) JP-A-7-275130 (JP, A) JP-A-3-136620 (JP, A) JP-A-3-63014 (JP , A) (58) Fields investigated (Int.Cl. ⁷ , DB name) A47J 37/06

Claims (2)

(57) [Claims] 1. A heating means for heating a cooking plate, a heating control means for controlling energization of the heating means, a power supply circuit serving as a drive power source for the heating control means, at least a common terminal, and the common terminal when the operation is turned off. A normally-closed terminal that is in a closed state, and a switch that has a normally-opened terminal that is in an open state with the common terminal when the operation is off, and a control unit that controls the heating control unit based on an input signal from the switch, The common terminal of the switch is connected to one output terminal of the power supply circuit, one of the normally open terminal or the normally closed terminal of the switch is connected to one power input terminal of the heating control means , and the other is connected. Before connecting the cooking plate to the control means, connect the other output terminal of the power supply circuit to the other power input terminal of the heating control means. An electric cooker configured such that the switch is activated and power is supplied from the power supply circuit to the heating control means. 2. A plurality of cooking plates are provided, a plurality of switches corresponding to the plurality of cooking plates are provided, and at least one of the plurality of switches is operated and installed when a predetermined cooking plate is installed. The electric cooker according to claim 1, wherein the electric cooker is configured to identify the type of cooking plate that is present.