JP2009061122A - Body warmer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a power supply switch from being turned on/off unconsciously and to hold a radiation plate always to a comfortable temperature in a working state while positively preventing wasteful consumption of a battery when not in use. <P>SOLUTION: This body warmer comprises the radiation plate 4 formed of a metal plate; a case 2 with the radiation plate 4 fixed thereto; a heater 3 thermally connected to the inner surface of the radiation plate 4 and enclosed in the case 2; the battery 1 enclosed in the case 2 to carry a current to the heater 3; and the power supply switch 8 connected between the battery 1 and the heater 3. The case 2 comprises a body case 5 and a detachable cover 6 detachably connected to the body case 5. In the body warmer, the battery 1 and the power supply switch 8 are mounted to the body case 5, and the power supply switch 8 is disposed inside the detachable cover 6. The detachable cover 6 is opened to turn on/off the power supply switch 8. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a warmer heated by a battery.

A warmer in which a battery and a heater are built in a case and the heater is heated by this battery has been developed and described in Patent Document 1. The body warmer described in Patent Document 1 is shown in FIG. In this warmer, a rechargeable battery 91, a heater 93 that is energized by the battery 91 and generates heat, and a power switch 95 that connects the heater 93 and the battery 91 are housed in a case 92. This warmer is used by switching the power switch 95 on and off.
JP-A-11-70137

  The warmer of FIG. 1 switches the power switch on when used, and turns the power switch off when not in use. Cairo, which incorporates a rechargeable battery as a power source, has the characteristic that it can be used conveniently and economically many times by charging the battery. However, since the heater of Cairo consumes a large amount of power, there is a drawback that the usage time of the battery is limited. For example, a warmer that incorporates two AA-type rechargeable batteries is limited to about 4 to 6 hours of heating time. A warmer powered by a battery has a limited battery usage time, but when not in use, the power switch can be turned off to prevent wasteful consumption of the battery. The disposable warmer has a long warming time but cannot temporarily stop heat generation like a warmer powered by a battery, and is kept warm for a certain time after being taken out of the bag. For this reason, it is important for a warmer that uses a battery as a power source to make it easy to operate the power switch in order to prevent the battery from being wasted when not in use. However, an easy-to-operate power switch may be switched from on to off during use and cannot be heated. In particular, the warmer is often used in a state where it cannot be seen by being stored in a pocket or the like, and the on state of the power switch may not be confirmed. Cairo does not generate sound like a radio or the like, so it cannot always check the on state of the power switch. Further, even if the power switch is turned off, the temperature of the heat radiating plate does not immediately drop, so that confirmation of turning off is delayed. To make matters worse, the heat dissipation plate made of a metal plate takes time to cool, but when cooled, it takes time to warm to a comfortable temperature, and when the power switch is turned off and cooled, However, there is a drawback that even if the user notices afterwards and switches the power switch to ON, it is not immediately heated to a comfortable temperature.

  The warmer described in the cited document 1 is provided with a power switch so as to be exposed to the outside of the case. Therefore, there is a problem that the power switch is switched from on to off without the user being aware of it. Further, when the power switch is turned off, it is not known until the heat radiating plate is cooled, and when the temperature of the heat radiating plate is lowered, there is a drawback that it takes time to heat. Further, when the heat radiating plate is cooled, the electric resistance of the heater is reduced, the power consumption of the battery is temporarily increased, and the consumption of the battery is increased.

  The present invention was developed for the purpose of solving the drawbacks of the conventional warmers. An important object of the present invention is that the power switch is not turned on and off unintentionally, the heat dissipation plate can always be kept at a comfortable temperature when in use, and the battery is wasted when not in use. It is to provide a warmer that can be prevented.

The body warmer of the present invention has the following configuration in order to achieve the above-described object.
The warmer includes a heat radiating plate 4 made of a metal plate, a case 2 that fixes the heat radiating plate 4, a heater 3 that is thermally coupled to the inner surface of the heat radiating plate 4, and is housed in the case 2. A battery 1 that is housed and energizes the heater 3 and a power switch 8 that is connected between the battery 1 and the heater 3 are provided. The case 2 includes a main body case 5 and a detachable lid 6 that is detachably connected to the main body case 5. Cairo attaches the battery 1 and the power switch 8 to the main body case 5, arranges the power switch 8 inside the detachable lid 6, opens the detachable lid 6, and turns the power switch 8 on and off.

  According to a second aspect of the present invention, the USB connector 9 is provided in the main body case 5 inside the attachment / detachment lid 6. The warmer opens the detachable lid 6 to connect the USB cord to the USB connector 9 and connects the detachable lid 6 to cover the USB connector 9 with the detachable lid 6.

  According to the third aspect of the present invention, the heat dissipation plate 4 made of a metal plate is fixed to the main body case 5, and the circuit board 7 on which the power switch 8 is mounted is connected to the main body case 5 to connect the battery 1. The battery 1 is set so as to be detachable, and the detachable lid 6 is opened to replace the battery 1.

  According to the fourth aspect of the present invention, the overall shape of the case 2 is a heart shape.

  In the warmer according to claim 5 of the present invention, the detachable lid 6 is made of translucent plastic, and a pilot lamp 18 is disposed inside the detachable lid 6, and the light from the pilot lamp 18 is transmitted to the detachable lid 6. Is radiated to the outside.

  In the warmer of the present invention, the power switch is not unintentionally switched, and the heat dissipation plate can always be maintained at a comfortable temperature when in use, and the wasteful consumption of the battery can be reliably prevented when not in use. . This is because the present invention has a structure in which the case of the warmer is connected to the main body case so that the detachable cover can be attached and detached, and a battery and a power switch are arranged in the main body case, and the power switch is arranged inside the detachable cover. This is because the power supply switch is turned on and off by opening the removal lid.

  In the warmer according to claim 2 of the present invention, the USB connector is provided in the main body case inside the detachable lid, the detachable lid is opened, the USB cord is connected to the USB connector, and the detachable lid is attached to the main body. It is connected to the case so that the USB connector is covered with a removable cover. In the warmer of this structure, not only the power switch but also a USB connector can be disposed inside the detachable lid and can be protected by the detachable lid. For this reason, the contact failure of the USB connector due to foreign matters such as dust can be eliminated and stable communication can be performed.

  Further, in the warmer according to claim 3 of the present invention, a heat radiating plate made of a metal plate is fixed to the main body case, and a circuit board on which a power switch is mounted is disposed on the main body case so that the battery can be freely attached and detached. The battery is replaced by opening the cover and removing the lid. The warmer of this structure has a heat sink plate, a battery, and a power switch attached to a main body case to form an integral structure, and a power supply switch is covered by connecting a detachable lid that does not mount an electronic circuit thereto. Therefore, the power switch and the battery can be covered and housed inside with a simple structure of the removable cover.

  In the warmer according to claim 4 of the present invention, the overall shape of the case is a heart shape, and the appearance can be clearly and beautifully designed. Furthermore, in the warmer according to claim 5 of the present invention, the detachable lid is made of a light-transmitting plastic, and the pilot lamp is disposed inside the detachable lid. The light from the pilot lamp passes through the attachment / detachment lid and is irradiated to the outside. This warmer can clearly display the usage state by transmitting the light of the pilot lamp inside the desorption lid to the outside.

  Embodiments of the present invention will be described below with reference to the drawings. However, the examples shown below exemplify a warmer for embodying the technical idea of the present invention, and the present invention does not specify the warmer as follows.

  Further, in this specification, for easy understanding of the scope of claims, numbers corresponding to the members shown in the embodiments are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

  The warmers shown in FIGS. 2 to 7 are accommodated in the case 2 by being thermally coupled to the heat radiating plate 4 made of a metal plate, the case 2 fixing the heat radiating plate 4, and the inner surface of the heat radiating plate 4. A heater 3, a battery 1 housed in the case 2 to energize the heater 3, and a power switch 8 connected between the battery 1 and the heater 3 to switch a state of supplying power from the battery 1 to the heater 3. Prepare. The power switch 8 is fixed to the circuit board 7 and is disposed at a fixed position in the case 2 via the circuit board 7. Further, the circuit board 7 fixes an electronic circuit that realizes a control circuit that controls the power supplied to the heater 3 to control the temperature of the heat radiating plate 4 and an elastic contact 11 that contacts the end electrode of the battery 1. Yes.

  In the illustrated body warmer, the entire planar shape of the case 2 is a heart shape. However, the overall body shape of the body warmer of the present invention may be an ellipse, a circle, a polygon or the like. In the figure, the case 2 has a thin elliptical cross section. Case 2 is made of plastic. The case 2 includes a plastic main body case 5 in which the battery 1 is built, and a detachable lid 6 that is detachably connected to the main body case 5. The main body case 5 includes a first case 5A on the upper side and a second case 5B on the lower side in the drawing. The heat radiating plate 4 is fixed to the second case 5B. The first case 5 </ b> A has a detachable lid 6 connected to its surface so as to cover it. The first case 5 </ b> A has an outer shape that follows the inner shape of the detachable lid 6.

  The body case 5 contains the battery 1 and the circuit board 7. The circuit board 7 is fixed to the first case 5A. The battery 1 is set so as to be detachable from the storage portion 10 provided in the first case 5A. The storage unit 10 of the battery 1 is opened upward so that the battery 1 can be attached and detached with the attachment / detachment lid 6 open. The warmer shown in the figure is provided with a storage unit 10 for storing two AA batteries 1 in parallel. The battery 1 set in the storage unit 10 brings the end electrode into contact with the elastic contact 11 fixed to the circuit board 7. Therefore, the circuit board 7 fixed to the first case 5 </ b> A fixes the elastic contact 11 at a position where it contacts the end electrodes on both ends of the battery 1. The elastic contact 11 is made of an elastic metal wire, and the metal wire that contacts one electrode of the battery 1 is coiled to be pressed and electrically connected to the end electrode of the battery 1 with a predetermined pressure.

  Further, as shown in FIG. 7, the first case 5A has an opening of a switch window 12 and a connector window 13 for displaying the power switch 8 and the USB connector 9 on the outside of the first case 5A with the detachable cover 6 opened. is doing. The power switch 8 and the USB connector 9 are fixed to the circuit board 7 of the first case 5 </ b> A so as to be disposed inside the attachment / detachment lid 6. As shown in FIG. 3, the power switch 8 slides the knob 8 </ b> A with the attachment / detachment lid 6 open to turn it on / off. As shown in FIG. 2, the power switch 8 is hidden inside the detachable lid 6 when the detachable lid 6 is set so as to cover the first case 5 </ b> A. Therefore, the power switch 8 cannot be operated with the detachable lid 6 connected. The USB connector 9 also connects the USB cord with the attachment / detachment lid 6 open. The USB cord connects the warmer to a control computer, sets the temperature of the warmer, or supplies the warmer with power for charging the battery 1. When the USB cord is removed and the attachment / detachment lid 6 is set, the USB connector 9 is inside the attachment / detachment lid 6 and is protected by the attachment / detachment lid 6 to prevent the attachment of dust or the like.

  Further, the first case 5A is provided with a screw hole 14 through which a set screw 20 for connecting the second case 5B is inserted. The set screw 20 inserted through the screw hole 14 is screwed into a connecting rib 15 provided in the second case 5B to connect the first case 5A to the second case 5B. The connecting ribs 15 are provided at three locations on the outer periphery of the second case 5B.

  The second case 5B has the heat radiating plate 4 fixed to the lower surface. The second case 5B has an opening 16 at the bottom, and the heater 3 is disposed here. The opening 16 of the second case 5B is closed by the heat radiating plate 4 that fixes the heater 3 to the inner surface. Further, the second case 5B is provided with a stepped portion 17 on which the heat radiating plate 4 is fitted. The 2nd case 5B is made into the shape which connects the outer periphery upper end edge with the outer periphery lower end edge of 1st case 5A.

  The heater 3 is a planar PTC heater 3A. In addition to the planar PTC heater, a heater using the heat generated by the transistor, a resistor, and the like can be used as the heater as a heater.

  The battery 1 is an AA type rechargeable battery, for example, an AA type nickel metal hydride battery. The AA type battery 1 can be charged and used repeatedly, or can be used by replacing it with a new battery. However, a lithium ion secondary battery, a nickel cadmium battery, etc. can be used for a battery. A battery that cannot be recharged can also be used. A warmer that accommodates two AA type nickel cadmium batteries can be used for about 4 to 5 hours by heating the heat radiation plate 4 to 42 ° C. to 46 ° C. with a flat PTC heater 3A. As the battery, a lithium ion battery can also be used, and this battery can be used for a longer time.

  The planar PTC heater 3 </ b> A has a substantially disc shape and is fixed to the inner surface of the heat radiating plate 4. In the figure, the circuit board 7 is disposed between the planar PTC heater 3 </ b> A and the battery 1. The circuit board 7 is located between the battery 1 and the PTC heater 3 </ b> A and blocks the heat of the heater 3 from being transmitted to the battery 1. This structure is suitable for the battery 1 being a nickel metal hydride battery. This is because the nickel-metal hydride battery has poor electrical characteristics at high temperatures.

  When the planar PTC heater 3A is energized and the temperature rises to a set temperature, the electrical resistance increases rapidly and the current is substantially cut off. Accordingly, the planar PTC heater 3A has a function of controlling the temperature below the set temperature by itself, and the maximum temperature can be made lower than the set temperature without using a control circuit for controlling the temperature. However, the planar PTC heater 3A can also control the temperature by controlling the current to be applied. The planar PTC heater 3A has silver-plated electrodes formed on both surfaces thereof, and power is supplied by contacting the surfaces of the planar PTC heater 3A while pressing the metal plates 21 and 22. That is, the planar PTC heater 3 </ b> A is fixed to the circuit board 7 with both surfaces sandwiched between the two metal plates 21 and 22. The metal plates 21 and 22 are formed by extending bent pieces 21 </ b> A and 22 </ b> A so as to penetrate the circuit board 7, and these bent pieces 21 </ b> A and 22 </ b> A are electrically connected to the circuit board 7.

  The heat radiating plate 4 is made of a metal plate having excellent heat conductivity such as aluminum or copper. As shown in the partially enlarged view of FIG. 5, the heat radiating plate 4 can be provided with innumerable irregularities 4 a on the surface to prevent low temperature burns. This is because the heat radiating plate 4 having the unevenness 4a does not come into close contact with the human body in surface contact. Although not shown, the surface of the heat dissipation plate can be covered with an elastomer to prevent low temperature burns. A body warmer that covers the periphery of the case with an elastomer can absorb impacts and the like caused by dropping to improve impact resistance.

  The detachable lid 6 is detachably connected to the main body case 5. In the illustrated warmer, the outer shape of the detachable lid 6 is configured to cover the entire upper surface of the main body case 5. In the illustrated warmer, the entire planar shape is a heart shape, so that the detachable lid 6 is also a heart shape. The detachable lid 6 has a shape in which the outer peripheral portion is curved downward, and the lower edge of the outer periphery is connected to the upper edge of the second case 5B. Therefore, the lower edge of the outer periphery of the detachable lid 6 is formed in the same shape as the upper edge of the outer periphery of the second case 5B. The detachable cover 6 is entirely or partially made of light-transmitting plastic, and transmits light from a pilot lamp 18 disposed inside the detachable cover 6 to irradiate the outside. In the illustrated warmer, a light emitting diode 18 </ b> A is fixed to the circuit board 7 as a pilot lamp 18. The light emitting diode 18 </ b> A is inserted into the through hole 19 provided in the first case 5 </ b> A and is disposed on the inner surface of the detachable lid 6. Further, the detachable lid 6 is positioned on the surface of the light emitting diode 18A, and a decorative plate 23, which is a translucent plastic that transmits the light of the light emitting diode 18A in a heart shape, is fixed. This warmer transmits the light in a heart shape with the decorative plate 23 and radiates it from the detachable lid 6 to the outside. Therefore, the light from the light emitting diode 18A can be beautifully emitted as a heart shape from the detachable lid 6.

  The detachable lid 6 is detachably connected to the main body case 5 with a locking structure. 3, 6, and 8 to 10, the pivot side, which is one end (left end in the figure) of the detachable lid 6, is connected to the main body case 5 so as to be pivotable. The locking side, which is the end (right end in the figure), is connected to the main body case 5 with a locking structure. As shown by the arrows in FIG. 3, the case 2 has a structure in which the attachment / detachment lid 6 is rotated with the rotation side as the center of rotation, the locking side is opened, and the main body case 5 is opened. The detachable lid 6 shown in the figure has a rotating connecting piece 24 protruding downward at one end, and a locking connecting piece 25 protruding downward inside the other end. The main body case 5 is provided with a rotation connection recess 28 at a position facing the rotation connection piece 24 of the detachable lid 6 at both ends, and a locking connection recess 29 at a position facing the locking connection piece 25. .

  As shown in FIGS. 8 and 10, the main body case 5 has a shaft 30 that rotatably connects the rotating connecting piece 24 to the rotating connecting recess 28. The shaft 30 is connected to a bearing portion 26 provided at the tip of the rotary connecting piece 24 so that the rotary connecting piece 24 can be rotated with respect to the shaft 30. Further, as shown in FIGS. 9 and 11, the main body case 5 is elastically deformed by pressing a locking piece 31 that locks the locking connection piece 25 into the locking connection recess 29 and pressing the locking piece 31. A pressing piece 32 is disposed.

  As shown in FIG. 11, the locking piece 31 includes a main body portion 31A fixed to the inner surface of the locking connection recess 29, and an elastic plate portion 31B integrally formed with the main body portion 31A. The main body 31A is U-shaped as a whole, and the fixing portions 31a at both ends are inserted and fixed in the fixing recesses 33 provided in the main body case 5, and the elastic plate portion 31B is connected to the central portion. The elastic plate portion 31B protrudes outward from the main body portion 31A with a downward slope, and has a hook 34 on the outer surface. As shown in FIG. 9, the locking piece 31 hooks the locking hook 34 of the elastic plate portion 31 </ b> B on the locking portion 27 provided inside the locking connection piece 25 of the attachment / detachment lid 6, thereby The structure can be locked.

  The pressing pieces 32 are connected to the main body case 5 in such a manner that the bearing portions 35 provided at both ends are connected to a rotating shaft 36 provided on the inner surface of the locking connection recess 29. Furthermore, the pressing piece 32 protrudes inside the lower end portion and is provided with a pressing portion 32A. When the pressing piece 32 having this structure is pressed from the outside toward the inside as indicated by an arrow A in FIG. 9, the pressing portion 32 </ b> A elastically deforms the elastic plate portion 31 </ b> B in the direction indicated by the arrow B, thereby The latching state of 34 and the latching | locking part 27 is cancelled | released. Further, in a state where the elastic plate portion 31B is not pressed by the pressing portion 32A, the elastic plate portion 31B is elastically returned to the position shown in FIG. The locking portion 27 to be locked is held so as not to come off.

  Further, the main body case 5 shown in FIG. 8 is provided with an elastic piece 37 that elastically presses the rotary connecting piece 24 of the detachable lid 6 on the rotary side of the detachable lid 6 so as to be integrally formed with the first case 5A. ing. The elastic piece 37 shown in the drawing protrudes outward from the side surface of the first case 5A and is formed in a U-shape, and the inner surface of the rotary connecting piece 24 is elastically biased in the direction to open the detachable lid 6. Is pressed. As described above, the case 2 that urges the detachable lid 6 in the opening direction reliably reduces the clearance between the lock hook 34 and the lock portion 27 in the locked state of the main body case 5 and the detachable cover 6. Can be held in a locked state. Further, when releasing the locked state, the pressing piece 32 can be operated to open the detachable lid 6 smoothly.

  The above case has a structure in which the detachable lid 6 can be rotated to the main body case 5, and the detachable lid 6 is detachably connected to the main body case 5. However, it is also possible for the body warmer to be provided with locking pieces on both sides of the detachable lid, to lock these detachable pieces to the main body case, and to connect the detachable lid to the main body case detachably. Locking pieces may be provided, and these lock pieces may be locked to the detachable lid so that the detachable lid is detachably connected to the main body case.

  A circuit diagram of the warmer is shown in FIG. The warmer shown in this circuit diagram includes a control circuit 40 that controls the power supplied from the battery 1 to the heater 3, and a temperature sensor 41 that detects the temperature of the heater 3. The control circuit 40 controls the power supplied to the planar PTC heater 3A to control the temperature of the planar PTC heater 3A, that is, the temperature of the heat dissipation plate 4.

  The control circuit 40 is provided between the battery 1 and the planar PTC heater 3A and is connected in series with the power switch 8 and a control unit 43 including a microcomputer for controlling the switching element 42 on and off. Is provided. In this warmer, since the planar PTC heater 3A is connected in series with the battery 1 via the switching element 42, the planar PTC heater 3A is also used in the protection circuit of the battery 1. For example, even if the switching element 42 is internally short-circuited or welded and held in the on state, the planar PTC heater 3A has a suddenly large electrical resistance at the set temperature, and the current is substantially cut off, thereby Because it protects.

  The controller 43 controls the temperature of the heat radiating plate 4 by controlling a duty for switching the switching element 42 on and off at a predetermined cycle. It is possible to increase the temperature of the planar PTC heater 3 </ b> A, that is, to increase the temperature of the heat radiating plate 4 by increasing the time for which the control unit 43 turns on the switching element 42. On the contrary, the control unit 43 can shorten the ON time of the switching element 42 to lower the temperatures of the planar PTC heater 3A and the heat dissipation plate 4. Further, the control unit 43 can control the duty of the switching element 42 with a signal from the temperature sensor 41 that detects the temperature of the heat radiating plate 4 to set the planar PTC heater 3 </ b> A and the heat radiating plate 4 to the set temperature. .

  The control circuit 40 has a memory 44 for storing the set temperature in the control unit 43. The control unit 43 controls the duty for switching the switching element 42 on and off so that the planar PTC heater 3 </ b> A has the set temperature stored in the memory 44. The controller 43 does not necessarily need to control the temperature with the duty by switching the switching element 42 on and off at a predetermined cycle. The control unit 43 switches off the switching element 42 when the planar PTC heater 3A becomes higher than the set temperature in response to a signal from the temperature sensor 41, and turns on the switching element 42 when the planar PTC heater 3A becomes lower than the set temperature. The planar PTC heater 3A can be kept at a set temperature by controlling to switch to.

  The memory 44 of the control circuit 40 stores an initial set temperature and a normal set temperature. The initial set temperature is higher than the normal set temperature. As shown in FIG. 13, the control circuit 40 first heats the planar PTC heater 3A to the initial set temperature when the power switch 8 of the warmer is turned on, and then controls the normal set temperature. The warmer that heats the planar PTC heater 3A and the heat radiating plate 4 with this temperature curve can quickly warm in a short time and warm when the user cools. After that, since it is set to the normal set temperature, the average current of the planar PTC heater 3A can be reduced and used for a long time.

  The control circuit 40 in FIG. 12 has a USB terminal 45 connected to the control unit 43. The USB terminal 45 is a USB connector 9 provided in the main body case 5 and is connected to a computer via a USB cord connected thereto. The control circuit 40 is connected to a computer via a USB terminal 45 and can change the set temperature stored in the memory 44 by a control signal input from the computer. This warmer can be connected to a computer and the user can adjust the temperature to the optimal setting.

  Furthermore, the warmer of FIG. 12 connects the light emitting diode 18A to the control circuit 40. The light emitting diode 18 </ b> A is fixed to the circuit board 7, and the blinking state is controlled by the control circuit 40. In the warmer of FIG. 3, the decorative plate 23 disposed above the light emitting diode 18 </ b> A is made of light-transmitting plastic and fixed to the detachable lid 6. The detachable cover 6 can transmit the light emitted from the light emitting diode 18A and display it outside without providing an opening window for exposing the light emitting diode 18A. The control circuit 40 stores a lighting pattern for lighting the light emitting diode 18 </ b> A in the memory 44 of the control unit 43. The lighting pattern of the light emitting diode 18 </ b> A stored in the memory 44 of the control unit 43 is changed by a computer connected via the USB terminal 45. This warmer can be changed to a lighting pattern that the user prefers by connecting a computer and controlling the lighting state of the light-emitting diode 18A.

  Further, the warmer of FIG. 12 has a charging circuit 46 for the battery 1 built in the case 2. The charging circuit 46 is connected to the USB terminal 45, and a direct current for charging the battery 1 is input via a USB cord connected to the USB terminal 45. However, Cairo is not specified as a structure for supplying power to the charging circuit from the USB cord, and a DC jack for connecting an AC adapter can be provided to input a direct current supplied therefrom to the charging circuit. Since the above warmers do not incorporate a circuit for converting the commercial power source into the battery charging voltage, the charging circuit can be made smaller.

  The charging circuit 46 is mounted on the circuit board 7 built in the case 2. The charging circuit 46 includes a charge control unit 47 that charges a lithium ion secondary battery or a lithium polymer battery, which are secondary batteries. The charging control unit 47 charges the secondary battery 1 with constant current / constant voltage, detects full charge, and stops charging. Further, the charging circuit 46 shown in the figure has a protective FET 48 connected in series with the secondary battery 1, and this protective FET 48 is controlled by a protective circuit 49. The protection circuit 49 detects overcharge, overdischarge, and temperature abnormality of the battery 1 and controls the protection FET 48 to be turned on / off. When the battery 1 being charged is fully charged and overcharged, the protection circuit 49 switches off the protection FET 48 and stops charging. When the discharged battery 1 is overdischarged, the protection circuit 49 switches off the protection FET 48 and stops the discharge of the battery 1. Further, when the battery temperature input from the temperature sensor 50 that detects the temperature of the battery 1 exceeds the set temperature and becomes abnormally high, the protection circuit 49 determines that the battery temperature is abnormal and switches the protection FET 48 off. The current flowing through the battery 1 is cut off.

It is a perspective view which shows the internal structure of the conventional warmer. It is a perspective view of the warmer concerning one example of the present invention. It is a perspective view which shows the state which opened the desorption cover of the warmer shown in FIG. It is a disassembled perspective view of the warmer shown in FIG. It is the sectional view on the AA line of Cairo shown in FIG. FIG. 3 is a cross-sectional view of the body warmer shown in FIG. It is CC sectional view taken on the line of Cairo shown in FIG. It is an expanded sectional view which shows the rotation side of the attachment / detachment lid of the warmer shown in FIG. It is an expanded sectional view which shows the latching side of the attachment / detachment lid of the warmer shown in FIG. FIG. 3 is a bottom perspective view showing a state where a detachable lid of the warmer shown in FIG. 2 is removed. It is a disassembled perspective view which shows the latching connection recessed part of a main body case. It is a circuit diagram of a warmer according to an embodiment of the present invention. It is a graph which shows an example of the temperature characteristic which a control circuit heats a heater.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Battery 2 ... Case 3 ... Heater 3A ... PTC heater 4 ... Radiation plate 4a ... Concavity and convexity 5 ... Main body case 5A ... 1st case
5B ... 2nd case 6 ... Detachable lid 7 ... Circuit board 8 ... Power switch 8A ... Knob 9 ... USB connector 10 ... Storage part 11 ... Elastic contact 12 ... Switch window 13 ... Connector window 14 ... Screw hole 15 ... Connecting rib 16 ... Opening part 17 ... Step part 18 ... Pilot lamp 18A ... Light emitting diode 19 ... Through hole 20 ... Set screw 21 ... Metal plate 21A ... Bending piece 22 ... Metal plate 22A ... Bending piece 23 ... Decoration plate 24 ... Rotating connecting piece 25 ... Locking connection piece 26 ... Bearing portion 27 ... Locking portion 28 ... Rotating connection recess 29 ... Locking connection recess 30 ... Shaft 31 ... Locking piece 31A ... Main body
31B ... Elastic plate
31a ... fixed portion 32 ... pressing piece 32A ... pressing portion 33 ... fixed recess 34 ... locking hook 35 ... bearing portion 36 ... rotating shaft 37 ... elastic piece 40 ... control circuit 41 ... temperature sensor 42 ... switching element 43 ... control unit 44 ... Memory 45 ... USB terminal 46 ... Charging circuit 47 ... Charge controller 48 ... Protective FET
49 ... Protection circuit 50 ... Temperature sensor 91 ... Battery 92 ... Case 93 ... Heater 95 ... Power switch

Claims (5)

A heat dissipating plate (4) made of a metal plate, a case (2) fixing the heat dissipating plate (4), and being thermally coupled to the inner surface of the heat dissipating plate (4) and housed in the case (2) A heater (3), a battery (1) housed in the case (2) and energized to the heater (3), and a power switch (8) connected between the battery (1) and the heater (3) Cairo with
The case (2) has a main body case (5) and a detachable lid (6) that is detachably connected to the main body case (5), and the battery (1) and the power switch (8) are connected to the main body case. Mounted on (5), the power switch (8) is arranged inside the detachable cover (6), and the power switch (8) can be turned on and off by opening the detachable cover (6). .   Inside the detachable lid (6), a USB connector (9) is disposed on the body case (5), and the detachable lid (6) is opened and a USB cord is connected to the USB connector (9). The body warmer according to claim 1, wherein the detachable cover (6) is connected to cover the USB connector (9) with the detachable cover (6).   A heat dissipation plate (4) made of a metal plate is fixed to the main body case (5), and a circuit board (7) on which a power switch (8) is mounted is connected to the main body case (5). The warmer according to claim 1, wherein (1) is set so as to be detachable, and the detachable lid (6) is opened to replace the battery (1).   The body warmer according to claim 1, wherein the entire shape of the case (2) is a heart shape.   The detachable lid (6) is made of a light-transmitting plastic, and a pilot lamp (18) is disposed inside the detachable lid (6), and the light of the pilot lamp (18) is removed from the detachable lid (6). The body warmer according to claim 1, wherein the body is irradiated to the outside through.

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