JP2002005866A - Portable electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable electronic device which has a power source built in and a portability, so that it can be taken outdoors and in which functional blocks for providing prescribed functions, when humidity in a casing becomes high are prevented from failing, even if the functional blocks have dew condensation. SOLUTION: This portable electronic device has a secondary power source 11 built in and the portability, so that it can be taken outdoors. The electronic device is constituted by being provided with functional blocks (5, 6, 7, 8, 9, etc.), for providing the prescribed functions by the power supply from the power source 11 and a chip-shaped humidity-sensing element 20, which is surface- mounted on a circuit board for protecting the functional blocks from condensation and senses humidity in the casing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable electronic device which has a built-in power supply and can be taken outside.

[0002]

2. Description of the Related Art Portable electronic devices powered by secondary batteries such as lithium-ion batteries, nickel-cadmium (nickel-cadmium) batteries, or nickel-metal hydride batteries are generally small, lightweight and highly portable, and can be carried anywhere at any time. It is convenient to carry around.

As portable electronic devices, magnetic tapes, M
Portable audio equipment, portable personal computers, digital cameras, portable radios, portable televisions, and the like using D (mini disc), CD (compact disc), solid-state memory, or HDD (hard disc drive) as a recording medium. is there. Further, mobile communication devices such as mobile phones and PHSs (Personal Handy Phones) are also widely used as portable electronic devices.

[0004]

However, since portable electronic devices are small and lightweight and can be carried around, they are used in high-humidity atmospheres such as outdoors in rainy weather, or suddenly from low-temperature outdoors in winter. Or the inside of the housing may be condensed due to being brought into a heated room. In addition, a liquid such as a beverage may be accidentally dropped or dropped into water.

As portable electronic devices have become smaller and lighter, there has been a demand for smaller electronic components used in their housings. As a result, the rated output of these electronic components has become smaller and the wiring intervals in the circuit have become narrower. It is becoming. In such a situation, if the humidity inside the housing increases due to the usage environment and dew condensation occurs on a circuit board or the like, a short circuit of the circuit due to moisture may occur and a functional block that should provide a predetermined function may be broken. The nature becomes high.

[0006] The energy capacity of a secondary battery is larger than that of a primary battery such as a manganese dry battery. Therefore, when a large current flows due to the short circuit of the circuit due to the moisture or the like, the secondary battery may generate heat rapidly and ignite. Therefore, when a secondary battery is used as a power source, humidity management in the housing is particularly important. In addition, a failure or an accident due to infiltration or dew of moisture into the housing can occur when charging the secondary battery.

However, in general, no special waterproofing measures are taken for portable electronic devices. This is because
First, taking a waterproof measure to improve the airtightness of the housing increases the weight of the device and impairs the portability. Secondly, there is a point that the cost in manufacturing the device is increased.

[0008] It is an object of the present invention to provide a portable electronic device that does not cause a failure in a functional block that provides a predetermined function due to dew condensation due to an increase in humidity in the housing. Another object of the present invention is to provide a portable electronic device capable of protecting a power supply for supplying power to a functional block from damage due to humidity.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a portable electronic device having a built-in power supply and capable of being taken out of the room and provided with a predetermined function by supplying power from the power supply. And a chip-shaped moisture-sensitive element that is surface-mounted on a circuit board to protect the functional block from dew condensation and senses humidity in the housing.

In the portable electronic device according to the present invention, if the humidity in the housing exceeds a predetermined threshold based on humidity data from the chip-shaped humidity sensing element, the humidity in the housing is equal to or less than the threshold. And a protection circuit that shuts off power supply from the power supply to the functional block until the power supply is turned off.

In the portable electronic device according to the present invention, the power supply is a secondary battery detachable from the housing.

In the portable electronic device according to the present invention, the chip-shaped moisture-sensitive element is provided on the secondary battery side.

[0013] In the portable electronic device according to the present invention, the protection circuit includes a warning unit that issues a warning when the relative humidity in the housing exceeds approximately 80%.

In the portable electronic device of the present invention, the functional block has a mobile communication function.

In the portable electronic device of the present invention, the chip-shaped moisture-sensitive element has a moisture-sensitive film in which conductive particles are dispersed in a water-absorbing polymer between a pair of electrodes. The polymer is characterized by being a polymer of a polyetheramine having two or more amino groups and an epoxy compound having two or more epoxy groups and further having an ether bond.

In the portable electronic device of the present invention, the chip-shaped moisture-sensitive element has a moisture-sensitive film in which conductive particles are dispersed in a water-absorbing polymer between a pair of electrodes. The polymer is a polymer of a polyetheramine having two or more amino groups, an epoxy compound having two or more epoxy groups, and further having an ether bond, and a water-soluble nylon. I do.

In the portable electronic device of the present invention, the chip-shaped moisture-sensitive element has a moisture-sensitive film in which conductive particles are dispersed in a water-absorbing polymer between a pair of electrodes. The polymer is a mixture of a polyetheramine having two or more amino groups and a polymer of an epoxy compound having an ether bond having two or more epoxy groups, and a water-soluble nylon. It is characterized by the following.

In the portable electronic device according to the present invention, the chip-shaped moisture-sensitive element has a moisture-sensitive film in which conductive particles are dispersed in a water-absorbing polymer between a pair of electrodes. The polymer is characterized by being a polyetheresteramide.

In the portable electronic device according to the present invention, the chip-shaped moisture-sensitive element has a moisture-sensitive film in which conductive particles are dispersed in a water-absorbing polymer between a pair of electrodes. The polymer is characterized in that it is a polymer of polyetheresteramide, water-soluble nylon, and an epoxy compound having two or more epoxy groups.

In the portable electronic device of the present invention, the chip-shaped moisture-sensitive element has a moisture-sensitive film in which conductive particles are dispersed in a water-absorbing polymer between a pair of electrodes. The polymer is characterized in that it is a mixture of polyetheresteramide and water-soluble nylon.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A portable electronic device according to an embodiment of the present invention will be described with reference to FIGS. In the present embodiment, an information recording / reproducing device will be described as an example of a portable electronic device having a built-in power supply and being portable outside. FIG. 1 is a schematic configuration of an information recording / reproducing apparatus 1 according to the present embodiment, and shows functional blocks for providing a predetermined function by supplying power from a power supply. As shown in FIG. 1, an information recording / reproducing apparatus 1 includes, for example, a CD1 as an information recording medium for reading information by rotating the information recording / reproducing apparatus.
And a driving device 3 for driving the driving device 8.

The information recording / reproducing apparatus 1 includes two memory cards 2a and 2b each having a solid-state memory as an information recording medium.
And interfaces 4a and 4b for transferring digital data between them. The memory cards 2a and 2b are detachably attached to the interfaces 4a and 4b, respectively. Memory card 2
Various memory cards can be used as a and 2b.

The interfaces 4a and 4b are controlled by a system control unit 7, and music data transferred from the interface is transferred to a reproduction output unit via the system control unit 7. System control unit 7
Is designed to control not only the interfaces 4a and 4b but also each circuit in the device 1.

The information recording / reproducing apparatus 1 has a display 6 composed of, for example, a liquid crystal display. The display 6 is electrically connected to the display control unit 5 and can display the title of the music being played, the playing time of the music, the remaining battery level, and the like. These display data are included in the music data read from the memory cards 2a, 2b via the interfaces 4a, 4b. The system control unit 7 sends these display data to the display control unit 5 from the read music data. The display control unit 5 controls the liquid crystal display device so that the display data sent is displayed on the display 6 in a predetermined manner.

The information recording / reproducing apparatus 1 has an audio DSP 8 and a codec 9. The audio DSP 8 and the codec 9 are controlled by the system control unit 7. The DSP 8 performs data processing such as compression / expansion processing of music data input from the system control unit 7 and effect processing as necessary, under the control of the system control unit 7. The processed data is returned to the system control unit 7 again or output to the codec 9. The DSP 8 according to the present embodiment has a plurality of decoder functions corresponding to each data format so that a plurality of music data created in various data formats can be reproduced. Therefore, for example, even if MP3 data is recorded on the memory card 2a, music data according to TwinVQ (a data compression method developed by NTT) is recorded on the memory card 2b, and WAVE data is recorded on the CD 18, system control is performed. Under the control of the unit 7, recording / reproduction can be performed for all of them.

The output terminal of the codec 9 is connected to the input / output terminal 14. The codec 9 includes a D / A (digital-analog) converter and an A / D converter so that music is output as analog data from the input / output terminal 14 or conversely, analog music data is input and converted into digital data. A D (analog-digital) converter is built in.

The music data received by the system control unit 7 when the music is reproduced is sent to the DSP 8 if compression processing such as MP3 has been performed, and expansion processing is performed. The expanded music data is sent to the codec 9 and output from the input / output terminal 14 as an analog music signal. Music data that has not been subjected to compression processing is directly input from the system control unit 7 to the codec 9 and output from the input / output terminal 14 as an analog music signal.

The analog music data input to the input / output terminal 14 is converted into digital data by the codec 9 and then sent to the DSP 8 when data compression and recording are performed. The music data sent to the DSP 8 is sent to the system control unit 7 after being subjected to a predetermined compression process. When recording as uncompressed data, data is output directly to the system control unit 7 without passing through the DSP 8. The music data for recording sent to the system control unit 7 is output to the memory card 2a or 2b via one of the interfaces 4a and 4b and recorded under the control of the system control unit 7.

The system control unit 7 stores information recording /
A signal from a control switch 16 used by a user of the playback apparatus 1 is input. Control switch 16
Specifically, a mechanical switch provided outside the housing of the information recording / reproducing apparatus 1 may be used.
Or a remote control switch provided in the middle of a cable of a headphone or an earphone connected to the output terminal. The control switch 16 can be provided with various switching functions as needed. For example, a signal for switching the power of the information recording / reproducing apparatus 1 on / off, switching between a recording mode and a reproducing mode, switching music data to be reproduced, or skipping music is transmitted to the system control unit. 7 may be sent. Alternatively, a signal for switching the display data to be displayed on the display 6 described above may be sent to the system control unit 7. The system control unit 7 includes the control switch 1
The respective circuits are controlled so as to be in a desired state in response to the signal from 6.

Next, the power supply of the information recording / reproducing apparatus 1 will be described. The information recording / reproducing apparatus 1 includes a secondary battery 1 for supplying power to each circuit in the information recording / reproducing apparatus 1.
1 is built-in. As the secondary battery 11, for example, a nickel-metal hydride battery or a lithium ion can be used. The information recording / reproducing apparatus 1 also has a built-in charging circuit 10 for charging the secondary battery 11. The charging circuit 10 is connected to an external AC adapter terminal 13. By connecting the output terminal of the AC adapter to the external AC adapter terminal 13, a predetermined voltage can be applied to the charging circuit 10 to charge the secondary battery 11.

Further, a voltage of, for example, 2.4 V can be applied to each circuit from the secondary battery 11 side while charging the secondary battery 11. The output terminal of the secondary battery 11 is also connected to a booster circuit 12, so that a voltage of 3.3 V can be applied from the booster circuit 12 to each circuit.

The information recording / reproducing apparatus 1 according to the present embodiment is surface-mounted on a circuit board in the housing to protect the functional block having the above configuration from dew condensation in the housing, and the humidity in the housing is controlled. Element 20 for sensing the humidity
have. Details of the chip-shaped moisture-sensitive element 20 will be described later with reference to FIGS.

The humidity data from the chip-shaped humidity sensing element 20 is sent to the system control unit 7 via the signal line 22. The chip-shaped moisture-sensitive element 20 is an element whose resistance value increases in response to an increase in humidity. The chip-shaped moisture-sensitive element 20 has resistance-humidity characteristics shown in FIG. The system control unit 7 detects the change in the resistance value of the chip-shaped moisture-sensitive element 20 and controls the power supply.

That is, based on the humidity data from the chip-shaped moisture-sensitive element 20, the system control unit 7 determines that the humidity in the housing exceeds the predetermined threshold value, and the secondary battery 11 transmits the humidity until the humidity in the housing becomes equal to or less than the threshold value. It has a function as a protection circuit for interrupting power supply to the above functional blocks. The system control unit 7 as a protection circuit prohibits the discharge or charging of the secondary battery 11 when detecting the intrusion of moisture in the housing. Further, after shutting off the power supply to the functional block, the system control unit 7 supplies the power to the functional block until the humidity in the housing becomes equal to or less than a predetermined threshold based on the humidity data from the chip-shaped moisture-sensitive element 20. To stop.

In FIG. 1, the humidity data of the chip-shaped humidity sensing element 20 is transmitted to a signal line 24 shown by a broken line instead of the signal line 22, so that it is attached to the secondary battery 11 instead of the system control unit 20. May be directly input to a protection circuit IC (not shown). That is, the chip-shaped moisture-sensitive element 20 is provided on the secondary battery 11 side and the chip-shaped moisture-sensitive element 20 is mounted on the protection circuit IC incorporated in the secondary battery 11.
A charge / discharge control FET (not shown) is incorporated when a resistance value exceeds a predetermined threshold value by incorporating a circuit for detecting a rise in the resistance value.
Can be driven to inhibit charging and discharging of the secondary battery 11. It is preferable that the protection IC seals all the circuit components so as to have perfect water resistance. Further, the chip-shaped moisture-sensitive element 20 may be attached to the surface of the secondary battery 11 to be integrated with the secondary battery 11.

When a high humidity atmosphere, for example, 80% RH (relative humidity) to 90% RH, which does not lead to condensation but is detected, is detected, a display is provided from a display or a speaker connected via the input / output terminal 14. The user may be warned to turn off the apparatus or move to a dry place by voice or sound. This can be applied to either a protection circuit based on the system control unit 7 or a protection circuit using a protection circuit IC on the secondary battery 11 side. FIG.
As shown in (2), when the relative humidity is 80% to 90%, the resistance value of the chip-shaped moisture-sensitive element 20 is about 20 kΩ to 100 kΩ.

Next, the operation of the information recording / reproducing apparatus 1 according to the present embodiment will be described. First, control switch 1
When a command to turn on the power of the information recording / reproducing apparatus 1 is input by the user operating the secondary battery 6, the secondary battery 1
1 supplies power to each circuit. System control unit 7
Performs error detection and protocol processing of the data signal of the music information of the CD 18 input from the driving device 3, and
The data sent from the CD drive is transmitted to the system controller 7
Is converted into a format that can be interpreted by the system control unit 7 or an electrical interface suitable for the system control unit 7.

The interfaces 4a and 4b perform error detection and protocol processing of a data signal of music information input from the memory card 2, and control for the memory card 2 to recognize the information recording / reproducing apparatus 1 as a device. Go. At this time, the interfaces 4a, 4b
Converts the data sent from the system control unit 7 into data suitable for the interface on the memory card 2a, 2b side in order to realize a control procedure between the system control unit 7 and the memory cards 2a, 2b. The interfaces 4a and 4b convert data and commands sent from the memory cards 2a and 2b into a format that can be interpreted by the system control unit 7 or convert the data or command into an electrical interface suitable for the system control unit 7. .

When the above-described interface operation is completed, the music data stored on the CD 18 is recorded on one of the solid-state memories of the memory cards 2a and 2b via the system controller 7 and the interfaces 4a and 4b. It becomes possible. The control switch 1 determines which of the memory cards 2a and 2b is used to record data.
6 and the display 6 are set.

When music data from the CD 18 is subjected to data compression processing, the music data input to the system control unit 7 is passed to the DSP 8 for compression processing, and then the memory card is transmitted via the interfaces 4a and 4b. 2
a or 2b. Further, when the music information of the CD 18 is transferred to the memory cards 2a and 2b, the transferred music data can be encrypted by using the system control unit 7. The control when transferring music data between the CD 18 and the memory cards 2a and 2b is performed by the system control unit 7, and the control by the system control unit 7 is started by an instruction from the control switch 16.

Next, a case where music data is input from the input terminal of the input / output terminal 14 and recorded will be described. First, the input analog music data is converted into digital data by the codec 9. If necessary, data compression is performed by the DSP 8 described above, and a CD (hereinafter, referred to as a CD-R) on which data can be written is driven by the driving device 3
Is controllable through the system control unit 7,
Output music data to R. When recording data on the memory cards 2a and 2b, data compression is performed by the DSP 8 if necessary, and the interfaces 4a and 4b are activated via the system control unit 7 to transfer music to at least one of the memory cards 2a and 2b. Output data.

Next, a case where an earphone or the like is connected to the output terminal of the input / output terminal 14 to reproduce and listen to music will be described. First, in order to reproduce music data recorded on the CD 18 in the CD drive, the music data is input via the drive 3. If the input music data is WAVE data, the music data is converted into analog music data by the codec 9 via the system control unit 7 and output from the output terminal of the input / output terminal 14. When playing music data recorded on the memory cards 2a and 2b, the music data is input via the interface 4. Input music data is M
If it is P3 data, the DSP 8 via the system control unit 7
After the data is expanded by input to the input / output terminal 14, the data is converted into analog music data by the codec 9 and output from the output terminal of the input / output terminal 14. If the music data recorded on the memory cards 2a and 2b has not been compressed,
Since the decompression process by SP8 is not performed, the music data is directly output from the system control unit 7 to the codec 9.

In the above operation, the system control unit 7
Controls switching of the recording / reproducing mode from the user through the control switch 16 and switching between the recording / reproducing medium of the CD 18 and the memory cards 2a and 2b. Further, the system control unit 7 controls the display control unit 5 to cause the display 6 to appropriately display necessary information according to an instruction from the control switch 16.

During the above operation, when the AC adapter is connected to the external AC adapter input terminal 13, the voltage is applied to the charging circuit 10 and
The secondary battery 11 supplies power to each circuit in the information recording / reproducing apparatus 1 while being charged. In the above operation, the system control unit 7 performs control for switching the recording / reproducing mode from the user through the control switch 16 and switching the recording / reproducing medium to another memory card 2. Further, the system control unit 7 controls the display control unit 5 to cause the display 6 to appropriately display necessary information according to an instruction from the control switch 16. While the above operations are being performed, 2
Power is continuously supplied from the next battery 11 to each circuit.

Further, in parallel with the above operation, the humidity data from the chip-shaped humidity sensing element 20 is sent to the system controller 7 via the signal line 22. The system control unit 7 monitors a change in the resistance value of the chip-shaped moisture-sensitive element 20. If it is determined that the humidity in the housing has exceeded a predetermined threshold, the secondary battery is operated until the humidity in the housing becomes equal to or less than the threshold. The power supply from 11 to the above functional block is cut off. Further, after shutting off the power supply to the functional block, the system control unit 7 supplies the power to the functional block until the humidity in the housing becomes equal to or less than a predetermined threshold based on the humidity data from the chip-shaped moisture-sensitive element 20. To stop.

When the humidity data of the chip-shaped humidity sensing element 20 is configured to be transmitted to the signal line 24, the chip-shaped sensing circuit is provided not to the system control unit 20 but to the protection circuit IC attached to the secondary battery 11. An increase in the resistance value of the wet element 20 is sent out. Accordingly, when the resistance value exceeds a predetermined threshold value, the protection circuit IC drives a charging / discharging control FET (not shown) to prohibit charging / discharging of the secondary battery 11.

When an atmosphere of high humidity, for example, 80% RH to 90% RH, which does not lead to dew condensation but is detected, is detected and used by a display or a speaker connected via the input / output terminal 14 for display or voice. The person is alerted to turn off the equipment or move to a dry place.

The portable electronic device according to the present embodiment described above takes a music recording / reproducing device as an example, but other portable electronic devices, for example, portable audio devices for recording / reproducing media other than CDs, A portable personal computer, a digital camera, a portable radio, a portable television, or the like, as well as a mobile communication device such as a cellular phone or a PHS (Personal Handy Phone), is provided with the chip-shaped moisture-sensitive element 20 in the housing. It is possible to configure a protection circuit similar to the embodiment.

When a protection circuit similar to that of the above embodiment is configured in a mobile communication device such as a portable telephone or a PHS, no dew condensation occurs, but a high humidity atmosphere such as 80% RH is used.
As a method of alerting the user when detecting ９０90% RH, an alert can be issued by vibration with a vibrator in addition to an audio alert with a display or a speaker.

In the above embodiment, the secondary battery 11
Is fixed in the information recording / reproducing device 1, but the secondary battery 11 may be removably mounted. 2
When the secondary battery 11 is made removable, the spare secondary battery 11 can be charged using an external AC adapter and a charger.

Further, it is also possible to use a dry battery instead of the secondary battery 11. However, in order to use the rechargeable battery 11 and the dry cell together, the charging circuit 1 must be used when the dry cell is used.
It is desirable to provide a mechanism for stopping the zero charging function.

Next, a description will be given of a chip-shaped moisture-sensitive element used in the portable electronic device according to the present embodiment. The moisture-sensitive element of the present embodiment is a chip-shaped moisture-sensitive element having a form of a chip-shaped electronic component, and is used by being surface-mounted on a circuit board of an electronic device. The reason that the surface mounting on the circuit board becomes possible is that the moisture-absorbing polymer in the moisture-sensitive film in which conductive particles are dispersed in the moisture-absorbing polymer used in the present embodiment has high heat resistance and is deteriorated by heat. Therefore, there is no decrease in performance as a moisture-sensitive film due to heat. At the time of surface mounting, a method of mounting a chip-shaped component on a circuit board, providing a solder layer in advance on a joint surface, and performing reflow soldering is preferably used. It is considered that the temperature of the moisture-sensitive film at that time reaches a maximum of 150 to 300 ° C. Since the hygroscopic polymer of this embodiment is not changed by such heat, it can be electrically connected to a circuit board by soldering.

The hygroscopic polymer used in this embodiment is:
As will be described in detail later, it is one of the following.

I) a polyetheramine having two or more amino groups, and a polyetheramine having two or more epoxy groups,
A polymer with an epoxy compound having an ether bond. ii) A polymer of a polyetheramine having two or more amino groups, an epoxy compound having two or more epoxy groups, and further having an ether bond, and a water-soluble nylon. iii) A mixture of a polymer of a polyetheramine having two or more amino groups, a polymer of an epoxy compound having two or more epoxy groups, and further having an ether bond, and water-soluble nylon. iv) Polyetheresteramide. v) A polymer of polyetheresteramide, water-soluble nylon, and an epoxy compound having two or more epoxy groups. vi) Mixture of polyetheresteramide and water-soluble nylon.

The moisture-sensitive element of this embodiment is not limited as long as it has a moisture-sensitive film between a pair of electrodes and is in the form of a chip-shaped electronic component. For example, the moisture-sensitive element may have the structure shown in FIG.

As shown in FIG. 2, the chip-shaped moisture sensitive element 31
Has a pair of comb-shaped electrodes 34 on an insulating substrate 32, and the pair of comb-shaped electrodes 34 are arranged on the insulating substrate 32 via a gap 35 at a fixed distance so as to mesh with each other. Then, a moisture sensitive film 33 is provided on the insulating substrate 32 and the comb-shaped electrodes 34 as shown in the figure. The comb-shaped electrode 34 is connected to an electrode 38 in the form of teeth of a comb.

On the lower surface of the insulating substrate 32, a pair of electrodes 36 for electrically connecting to the electronic circuit substrate are provided. Further, an end surface electrode 37 for establishing electrical conduction between the electrode 36 and the electrode 38 is formed on the end surface.

The shape of the chip-shaped moisture-sensitive element 31 is a rectangular parallelepiped or a cube, the size of which is 5 mm or less (normally 0.3 mm or more) and the height is 1 mm or less (normally 0.3 m or more).
m or more).

Referring to FIG. 2, as the insulating substrate 32 used in the present embodiment, any material can be used as long as it has good adhesiveness to the moisture-sensitive film 33 and electrical insulation. For example, glass, heat-resistant plastic such as epoxy resin, polyimide, and BT resin, ceramic such as alumina, or metal coated with insulation may be used.

The comb-shaped electrode 34 is not particularly limited as long as it is a commonly used electrode. The comb-shaped electrode 34 contains carbon particles such as Au, RuO ₂ , carbon black and graphite, and if necessary, contains glass frit. High-temperature sintering of a resistance paste or the like can be used. Also, A
If it is a metal such as u, the electrode pattern can be formed by vapor deposition. In this case, the gap between the electrodes can be reduced, and the resistance value of the moisture-sensitive element can be reduced. The gap between the electrodes is usually 0.05
It is about 1 mm. The electrodes 36, 37, and 38 may be formed by screen printing or the like using, for example, a silver-palladium alloy or the like.

The chip-shaped moisture-sensitive element of this embodiment has a moisture-sensitive film in which conductive particles are dispersed in a hygroscopic polymer between a pair of electrodes. First, the above-mentioned items i) to iii )
Will be described. The hygroscopic polymer is 2
It is a polymer of a polyetheramine having two or more amino groups and an epoxy compound having two or more epoxy groups and further having an ether bond. Alternatively, it is a polymer of a polyetheramine having two or more amino groups, an epoxy compound having two or more epoxy groups, and further having an ether bond, and a water-soluble nylon. Alternatively, the hygroscopic polymer has a polyetheramine having two or more amino groups, a polymer having two or more epoxy groups, and an epoxy compound having an ether bond, and a water-soluble nylon. It may be a mixture. Also,
Both may be mixed. It is preferable that the water-soluble nylon also has an ether bond and has enhanced hydrophilicity.
Usually, it is considered that polyetheramine, epoxy compound and water-soluble nylon are copolymerized.

The above-mentioned hygroscopic polymer used in the present embodiment is less than 90% RH, especially 60% RH or more and 90% RH.
Since moisture absorption starts from a humidity region lower than H, it is possible to detect not only a high humidity region equal to or higher than 90% RH but also a low humidity region lower than 90% RH. In particular, the humidity sensor of the present embodiment can detect the humidity in the range of 60 to 100% RH.

Further, since the amount of moisture absorption is as large as 10 to 20 wt%, a large amount of conductive particles can be taken, and stable resistance-humidity characteristics can be obtained. It is considered that the hygroscopicity of the hygroscopic polymer used in the present embodiment is mainly expressed by an ether bond (-O-), and an amino group and a hydroxyl group also contribute. If the water-soluble nylon also has an ether bond, the moisture absorption increases accordingly. The humidity-sensitive element of this embodiment has a dry resistance of about 400 Ω to 2 kΩ, and a change in resistance of about 4 to 6 digits.

Moreover, the humidity-sensitive element of this embodiment has extremely stable resistance-humidity characteristics even when repeatedly exposed to a dry atmosphere and a high-humidity atmosphere, and its change is extremely small.

Further, even when exposed to a high-temperature and high-humidity atmosphere for a long time, the change in resistance-humidity characteristics is extremely small. In particular, from such a viewpoint, it is preferable to use a polymer of a polyetheramine and an epoxy compound and a water-soluble nylon, or a mixture of a polymer of a polyetheramine and an epoxy compound and a water-soluble nylon as the hygroscopic polymer. .

Further, since a moisture-sensitive film in which conductive particles are dispersed in a hygroscopic polymer is used, direct current measurement is possible.
The measurement circuit can be simplified and the cost is low.

First, the polyetheramine used for the hygroscopic polymer will be described. The polyetheramine refers to a polyoxyalkyleneamine and is a compound containing a primary amino group at a terminal of a polyether skeleton.

The polyether skeleton may be any of alkylene oxides, but is preferably propylene oxide (PO), ethylene oxide (EO) or mixed EO / PO. In the case of mixed EO / PO, EO / PO is arbitrary, but the larger the EO / PO, the lower the humidity can be detected. E
If it has an O skeleton, it is completely dissolved in water, and if it has only an EO skeleton, it is much more reactive than the others. When the EO skeleton is used, the resistance value increases due to low humidity.
Stability against repeated operations tends to decrease.

The number of terminal amino groups is 2 or more, preferably 2
It is preferable to have up to three. That is, diamines and triamines are preferred.

The molecular weight of polyetheramine is 1
It is preferably from 00 to 5000, particularly preferably from 100 to 2000. If the molecular weight is too large, the resistance value tends to increase from higher humidity. When a mixture is used, the number average molecular weight (Mn) is preferably in the above range.

The diether polyetheramine is synthesized by reacting a dihydric alcohol with an alkylene oxide, preferably propylene oxide and / or ethylene oxide, and then converting the terminal hydroxy group to an amino group. Examples of the diol include ethylene glycol and propylene glycol.

The polyetheramine of triamine is synthesized by reacting an initiator, such as triol, with an alkylene oxide, preferably propylene oxide, and then converting the terminal hydroxy group to an amino group. Examples of the initiator triol include trimethylolpropane, glycerin and the like.

The total amine value of the polyetheramine used is preferably 0.3 to 15 meq / g, particularly preferably 2 to 10 meq / g.
meq / g is preferred. It is preferred that 95% or more thereof is a primary amine. If the amine value is larger than this, the crosslink density becomes excessively high, so that the water absorption decreases, and the sensitivity tends to decrease. If it is smaller than this, the degree of crosslinking tends to be low, and the water resistance tends to decrease.

The flash point of the polyetheramine used in this embodiment is preferably 100 ° C. or higher, particularly preferably 120 to 300 ° C. If the flash point is lower than this, it becomes difficult to obtain sufficient safety.

Polyetheramine has a water content of 0.5 wt.
%, Preferably 0.25 wt% or less.

The polyetheramine used in the present embodiment is commercially available. For example, as polyoxypropylenediamine, Jeffamine D-2 manufactured by Texaco Chemical Co., Ltd.
30, 400, 2000, 4000, etc., as polyoxyethylene diamine, Texaco Chemical Jeffamine EDR-148, etc., and as polyoxyethylene propylene diamine, Texaco Chemical Jeffamine ED-600, 900, 2003, etc. Examples of the polyoxypropylene triamine include Jeffamine T-403, 3000, 5000, etc., manufactured by Texaco Chemical Company.

Next, the epoxy compound used for the hygroscopic polymer will be described. The epoxy compound used in the present embodiment has two or more, preferably two to four epoxy groups, and further has an ether bond. By having an ether group, hydrophilicity is enhanced.

The epoxy group is preferably 1,2-epoxide, but may be 1,3-epoxide, 1,4-epoxide, 1,5-epoxide or the like.

Examples of such an epoxy compound having an ether structure include sorbitol polyglycidyl ether, sorbitan polyglycidyl ether, polyglycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, diglycerol polyglycidyl ether, triglycidyl tris (2 -Hydroxyethyl) isocyanurate, glycerol polyglycidyl ether, trimethylolpropane polyglycidyl ether, neopentyl glycol diglycidyl ether,
Examples thereof include ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, and polypropylene glycol diglycidyl ether. Further, these derivatives may be used. One epoxy compound may be used alone, or two or more epoxy compounds may be used in combination. When two or more kinds are used in combination, the quantitative ratio is arbitrary.

The epoxy compound used in the present embodiment is commercially available. For example, sorbitol polyglycidyl ether is Denacol EX-611, 6 manufactured by Nagase Kasei.
12, 614, 614B and the like are sorbitan polyglycidyl ethers such as Denacol EX-65 manufactured by Nagase Kasei.
1, 651A and the like, as polyglycerol polyglycidyl ether, Nagase Kasei Denacol EX-512,
521, etc., as pentaerythritol polyglycidyl ether, such as Denaseol EX-411 manufactured by Nagase Kasei, as diglycerol polyglycidyl ether, such as Denacol EX-421 manufactured by Nagase Kasei, and as triglycidyl tris (2-hydroxyethyl) isocyanurate. Is Nagase Kasei Denacol EX-301, etc .; glycerol polyglycidyl ether is Nagase Kasei Denacol EX-313, 314 etc .; trimethylolpropane polyglycidyl ether is Nagase Kasei Denacol EX-321 etc .; neopentyl glycol As the diglycidyl ether, Nagase Kasei Denacol EX-211 and the like, and as the ethylene glycol diglycidyl ether, Nagase Kasei Denacol EX-810,
811 and the like, as polyethylene glycol diglycidyl ether, Denacol EX-850, 8 manufactured by Nagase Kasei.
51, 821, 830, 832, 841, 861, etc.
Examples of propylene glycol diglycidyl ether include Denacol EX-911 manufactured by Nagase Kasei, and examples of polypropylene glycol diglycidyl ether include Denacol EX-941, 920, 921, 931 manufactured by Nagase Kasei.

The epoxy compound used in the present embodiment has an epoxy equivalent of 50 to 700 WPE, particularly 100 to 250 WPE.
Preferably, it is PE. If the epoxy equivalent is larger than this, the crosslink density becomes excessively high, so that the water absorption decreases, and the sensitivity tends to decrease. If it is smaller than this, the degree of crosslinking tends to decrease, and the water resistance tends to decrease.

The water solubility of the epoxy compound used in this embodiment is preferably from 15 to 100%, particularly preferably from 20 to 100%. If the water solubility is lower than this, the detectable humidity becomes high and may become 90% RH or more. Here, the water solubility refers to the dissolution rate when 10 parts by weight of the resin is dissolved in 90 parts by weight of water at 25 ° C.

The flash point of the epoxy compound used in the present embodiment is preferably 90 ° C. or higher, particularly preferably 120 to 300 ° C. If the flash point is lower than this, it becomes difficult to obtain sufficient safety.

The epoxy compound is preferably chlorine or the like.
It may contain 5 wt% or less, more preferably 15 wt% or less.

Next, the water-soluble nylon used for the hygroscopic polymer will be described. The water-soluble nylon used in the present embodiment preferably has an ether bond.

The water solubility of the water-soluble nylon used is water 10
It is preferable to dissolve 1 part or more, especially 10 parts or more based on 0 parts by weight. If the water solubility is lower than this, the moisture absorption of the moisture-sensitive film tends to decrease, and the sensitivity tends to decrease.

Such a water-soluble nylon is obtained by subjecting a polyalkylene glycol to cyanoethylation and hydrogenation to form a diamine, and reacting a so-called nylon salt of 1 mol of the diamine with adipic acid and caprolactam. Can be Specifically, Japanese Patent Application Laid-Open No. Sho 60-2
What is necessary is just to synthesize | combine according to 47440 gazettes.

The polymerization of the polyetheramine, the epoxy compound and the water-soluble nylon is carried out by adding water-soluble nylon to alcohol or water in an amount of 0.1 to 60% by weight, preferably 0.5 to 3%.
0% by weight, and a polyetheramine and an epoxy compound are added in a total amount of 10 to 80% by weight, preferably 30 to 80% by weight.
60% by weight and dispersed, 80-180 ° C,
Heating may be performed preferably at 120 to 160 ° C. for 30 minutes to 3 hours, preferably 60 minutes to 2 hours. As a dispersion medium,
Ethyl cellosolve, ethylene glycol and the like are preferred.
The polymerization conditions are appropriately selected depending on the water-soluble nylon, polyetheramine and epoxy compound used, and are not limited to the above conditions. In addition, as will be described later, usually, conductive particles are also added to the dispersion medium, coated, and then heated to polymerize.

The resulting polymer is generally considered to be a polymer obtained by graft-polymerizing a polyetheramine and an epoxy compound on water-soluble nylon. At this time, nylon is not polymerized, and may be a mixture of a polymer of polyetheramine and an epoxy compound.

The polymerization for obtaining a polymer of a polyetheramine and an epoxy compound may be carried out in the same manner as described above, except that no water-soluble nylon is added.

The composition of the polyetheramine and the epoxy compound having an ether structure preferably has an amine value and an epoxy value of 1: 1 to 1: 4, particularly preferably equivalent, from the viewpoint of characteristic stability. It is also possible to control the resistance / humidity characteristic by shifting the composition from the equivalent amount. In a composition in which the amount of the amine is excessive, the resistance value increases at lower humidity, but the characteristic stability tends to decrease.

The water-soluble nylon is used in an amount of 0.1 to 50 watts based on the total weight of the polyetheramine and the epoxy compound.
It is preferable to use t%, particularly 1 to 10 wt%. If the amount of the water-soluble nylon is more than this, the resistance value tends to gradually decrease when exposed to a high-temperature and high-humidity atmosphere for a long time.
If the amount of water-soluble nylon is less than this, the resistance value tends to gradually increase when exposed to a high-temperature and high-humidity atmosphere for a long time.

A polymer of a polyetheramine and an epoxy compound, a polymer of a polyetheramine and an epoxy compound and a water-soluble nylon, or a mixture of a polymer of a polyetheramine and an epoxy compound and a water-soluble nylon
The water absorption at 5 ° C. and 80% RH is preferably 4 to 20%, particularly preferably 6 to 15%. If the water absorption is higher than this, the change in resistance increases, but when exposed to a high-humidity region, the resistance may not return to the original value while increasing. If the water absorption is lower than this, the polymer will not swell sufficiently at the time of moisture absorption, and the sensitivity will decrease.

Further, in order to enhance the effect of the present embodiment, a hydrophobic or water-repellent substance may be added. For example, a silicone oil, particularly a silicone oil modified with a functional group such as an amine or an epoxy group, or a long-chain alkyl having a functional group may be added. When exposed to a high-humidity region when the water absorption of a polymer of a polyetheramine and an epoxy compound and a water-soluble nylon, or a mixture of a polymer of a polyetheramine and an epoxy compound and a water-soluble nylon is high, as described above. In some cases, the resistance value does not return to the original state while increasing, but the addition of these suppresses it. The amount of the hydrophobic or water-repellent substance to be added is 30% by weight or less, preferably 3 to 3%, based on the total weight of the polyetheramine, epoxy compound and water-soluble nylon.
20 wt% is preferred. If the amount added is more than this,
The water absorption of the moisture-sensitive film decreases, and the sensitivity decreases. Also,
The functional group equivalent of silicone oil is 100-2000 g /
mol, particularly preferably 200 to 1000 g / mol.

Further, another embodiment of the present embodiment includes the above-mentioned iv), v), and vi). As the hygroscopic polymer, a polyetheramine having two or more amino groups, Instead of a polymer with an epoxy compound having an epoxy group and having an ether bond, a polyetheresteramide, preferably a polyetheresteramide represented by the following formula (2) may be used (the above-described formula (2)). vi)). In this case, it is usually a mixture of polyetheresteramide and water-soluble nylon. Also, 2
A compound obtained by polymerizing polyetheresteramide and water-soluble nylon by adding an epoxy compound having at least two epoxy groups, that is, polyetheresteramide, water-soluble nylon, and an epoxy compound having two or more epoxy groups. May be used as a hygroscopic polymer (v)). Further, polyetheresteramide may be used as the hygroscopic polymer (the above iv)). In any case, the same effect as in the case of using a polymer of a polyetheramine having two or more amino groups and an epoxy compound having two or more epoxy groups and further having an ether bond is obtained. Thus, it is possible to detect the humidity not only in the high humidity region of 90% RH or more but also in the low humidity region of less than 90% RH. This humidity-sensitive element can also detect the humidity particularly in the region of 60 to 100% RH. Also, its moisture absorption is 10
Since it is as large as ~ 20 wt%, the filling amount of the conductive particles can be large, and stable resistance / humidity characteristics can be obtained. Moreover, the resistance / humidity characteristics are extremely stable even when repeatedly exposed to a dry atmosphere and a high-humidity atmosphere, or to a high-temperature and high-humidity atmosphere for a long time.

Such polyetheresteramides have a linear, regular chain structure of hard polyamide segments and flexible polyether segments. This material has excellent properties such as mechanical properties due to its dual properties. Polyetheresteramide is obtained by reacting a polyamide diacid oligomer with a polyetherdiol oligomer.

The polyetheresteramide used in the present embodiment is described in French Patent Nos. 2,273,021, 2,401,947 and 2,384,810.
No. 7,007,559, U.S. Pat. Nos. 4,345,064, 4,349,661, 4,345,052, and French Patent Application 910.
No. 3,175, JP-A-7-102062 and the like are preferable. Also, European Patent 0,378,
No. 015, No. 0,476,963, JP-A-10-1
No. 58509.

The water-soluble nylon is used in an amount of 0.1 to 50% by weight, especially 1 to 50% by weight based on the weight of the polyetheresteramide.
It is preferable to use 20 wt%. If the amount of the water-soluble nylon is more than this, the resistance value tends to gradually decrease when exposed to a high-temperature and high-humidity atmosphere for a long time. If the amount of water-soluble nylon is less than this, the resistance value tends to gradually increase when exposed to a high-temperature and high-humidity atmosphere for a long time.

In order to polymerize polyetheresteramide and water-soluble nylon, an epoxy compound having two or more epoxy groups may be added. In this case,
A polymer of polyetheresteramide, water-soluble nylon, and epoxy compound is obtained, but may be a mixture without partially polymerizing.

The epoxy compound having two or more epoxy groups is not particularly limited as long as the polymerization reaction proceeds. However, the epoxy compound having two or more epoxy groups used for the above-mentioned hygroscopic polymer, It is preferable to use an epoxy compound having an ether bond.

The epoxy compound having two or more epoxy groups is not particularly limited, but is preferably used in an amount of 1 to 20% by weight based on the total weight of water-soluble nylon and polyetheresteramide. .

Water absorption at 25 ° C. and 80% RH of a mixture of polyetheresteramide and water-soluble nylon, or a polymer of polyetheresteramide and water-soluble nylon and an epoxy compound having two or more epoxy groups Is preferably 4 to 20%, particularly preferably 6 to 15%. If the water absorption is higher than this, the change in resistance increases, but when exposed to a high-humidity region, the resistance may not return to the original value while increasing. If the water absorption is lower than this, the polymer will not swell sufficiently at the time of moisture absorption, and the sensitivity will decrease.

In the polymerization of polyetheresteramide, water-soluble nylon and an epoxy compound having two or more epoxy groups, 0.1 to 60% by weight, preferably 0.5 to 30% by weight of water-soluble nylon is added to alcohol or water. %, Dispersed by adding a polyetheresteramide and an epoxy compound, and then at 80 to 180 ° C, preferably 120 to 160 ° C, for 30 minutes to 3 hours, preferably 6
The heating may be performed for 0 minute to 2 hours. As the dispersion medium, ethyl cellosolve, ethylene glycol and the like are preferable. In addition,
The polymerization conditions are appropriately selected depending on the water-soluble nylon, polyetheresteramide, and epoxy compound to be used, and are not limited to the above conditions. Also, as will be described later,
Normally, conductive particles are also added to the dispersion medium, and after coating, they are heated and polymerized.

In this case, a hydrophobic or water-repellent substance may be added. For example, a silicone oil, particularly a silicone oil modified with a functional group such as an amine or an epoxy group, or a long-chain alkyl having a functional group may be added. A mixture or polymer of polyetheresteramide and water-soluble nylon as described above,
Alternatively, when the water absorption of polyetheresteramide is high, exposure to a high-humidity region may cause the resistance value to rise and not return to its original state. The amount of the hydrophobic or water-repellent substance to be added is preferably 30 wt% or less, particularly preferably 3 to 20 wt%, based on the total weight of the polyetheresteramide and the water-soluble nylon. If the addition amount is more than this, the water absorption of the moisture-sensitive film decreases, and the sensitivity decreases. The functional group equivalent of the silicone oil is 100 to 2000 g / mol, especially 2
00 to 1000 g / mol is preferred.

The conductive particles used in the present embodiment include carbon-based particles such as carbon black and graphite;
Metal powders such as nickel, gold, silver, and copper are exemplified.
Particularly, carbon black and the like are preferably used. The specific surface area of the carbon black is 30~300m ² / g, still more 30 to 150 m ² / g, and particularly preferably from 30~75m ² / g. The primary particles of carbon black have an average particle diameter of 20 to 50 nm, preferably have a developed structure, and have a DBP oil absorption of 100 ml / 100.
g (usually 150 ml / 100 g or less). In general, the average particle size of the conductive particles (the diameter when the projected area is converted into a circle when the particles are not spherical particles)
Is preferably about 20 nm to 3 μm.

In the case of carbon black, the filling amount of the conductive particles in the moisture-sensitive film of this embodiment is preferably 5 to 40% by weight, more preferably 10 to 30% by weight. When the filling amount of the conductive particles is small, the resistance value during drying becomes too high, and the resistance value changes when repeatedly exposed to a dry atmosphere and a high humidity atmosphere. On the other hand, if the amount is too large, the change in the resistance value with respect to the change in the humidity becomes small, and the sensitivity as a moisture-sensitive element decreases. The other conductive particles may have a filling amount according to this.

In the present embodiment, the method for forming the moisture-sensitive film is not limited, but may be formed by coating using a dispersion containing the constituent material of the moisture-sensitive film. As the dispersion medium, water, alcohols, ethers, and ketones are preferable, and a mixed solvent thereof may also be used. As a coating method, a screen printing method is usually used as described above.

After forming the coating film, it is cured at a temperature of about 80 to 180 ° C. for about 30 minutes to 3 hours. The curing conditions are appropriately selected depending on the polyetheramine and the epoxy compound to be used or the polyetheramine and the epoxy compound and the water-soluble nylon, and are not limited to the above conditions. At this time, the polyetheramine and the epoxy compound or the polyetheramine and the epoxy compound and the water-soluble nylon are polymerized.

The dry thickness of the thus obtained moisture sensitive film is preferably 5 μm or less, particularly preferably 1 to 3.5 μm. Thereby, permeation of moisture is sufficiently ensured.

[0110]

EXAMPLES Specific examples of this embodiment will be described below. As shown in FIG. 3, a silver-palladium alloy electrode 38 and an electrode 36 were printed and baked on an alumina substrate 39 having vertical and horizontal dividing grooves 40 (see FIG. 2). The pattern of the comb electrode 34 was printed with ruthenium oxide and baked (see FIG. 2). The alumina substrate 39 was subjected to primary division, and a strip 41 was obtained. A conductor 42 serving as an end surface electrode was formed of a silver-palladium alloy on the end surface of the strip 41. The product was subjected to a secondary division to obtain a 3.2 × 1.6 mm individual product. In addition,
The height is 0.5 mm.

The individual products were arranged on a pallet, a resist resin was printed on the pattern of the comb-shaped electrodes 34, and the resin was cured. Barrel plating was performed to form a solder layer on the electrode 38, the electrode 36, and the end face electrode 37. The resist resin was removed. A paste in which carbon black was dispersed in a hygroscopic polymer solution was screen-printed on the pattern of the comb-shaped electrode 34 and cured at 165 ° C. for 1 hour to form a moisture-sensitive film. The dry thickness of the moisture-sensitive film was 3 μm.

The preparation of the moisture sensitive material paste was performed as follows. 0.5 parts by weight of water-soluble nylon P-70 manufactured by Toray (relative viscosity: 2.83, water solubility: 100 parts by weight or more per 100 parts by weight of water) were dissolved in 5 parts by weight of ethylene glycol. Further, polyoxypropylenediamine Jeffamine D400 (number average molecular weight 400, amine value 4.4 meq / g, viscosity (2
0 ° C) 29 cp) 5.7 parts by weight, Jeffamine D20
00 (number average molecular weight 200, amine value 1.0 meq /
g, viscosity (342 cp) at 342 cp) 3.8 parts by weight Carbon black (Tokai Carbon's Toka Black # 45OO)
F) Add 3.6 parts by weight of Kurabo Industries planetary stirrer KK-
Disperse at 100 for 9 minutes. Then, sorbitol polyglycidyl ether EX614B manufactured by Nagase Kasei (epoxy equivalent 180 WPE, water solubility 90%, viscosity (25 ° C.) 4
000 cps, specific gravity (25 ° C.) 1.26) 10.5 parts by weight was added, and the mixture was further dispersed for 1 minute to obtain a moisture-sensitive paste.

FIG. 4 shows the resistance-humidity characteristics before and after passing the obtained 3.2 × 1.6 mm moisture-sensitive element through a reflow furnace having a preheating temperature of 180 ° C. and a peak temperature of 240 ° C. FIG.
As is clear from the figure, the resistance / humidity characteristics did not change even after passing through the reflow furnace.

According to the present embodiment, it can be surface-mounted on a circuit board, can be measured by direct current, can detect a humidity of less than 90% RH, particularly in a region of 60 to 100% RH. It is possible to obtain a chip-shaped moisture-sensitive element having high characteristic stability with respect to operation and having little characteristic deterioration even in a high-temperature, high-humidity atmosphere.

[0115]

As described above, according to the present invention, for example, 2
In the case of portable electronic equipment that uses a secondary battery as a power source, when water enters or forms dew inside the housing, power supply to the main circuit or charging and discharging of the secondary battery is prohibited, and moisture remains in the housing. Power supply to the main circuit or 2
A protection function that continues to prohibit charging and discharging of the next battery can be realized.

Further, according to the present invention, a warning can be issued to the user when the humidity in the housing becomes high and dew condensation is likely to occur, thereby preventing a circuit failure or the like.

[0117]

[Brief description of the drawings]

FIG. 1 is a system block diagram showing a schematic configuration of a portable electronic device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration example of a chip-shaped moisture-sensitive element according to an embodiment of the present invention.

FIG. 3 is a perspective view showing a part of an example of a manufacturing process of the chip-shaped moisture-sensitive element according to one embodiment of the present invention.

FIG. 4 is a graph showing resistance-humidity characteristics before and after a chip-shaped moisture-sensitive element is passed through a reflow furnace in an example of a manufacturing process of the chip-shaped moisture-sensitive element according to one embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 information recording / reproducing device 2a, 2b memory card 3 drive device 4a, 4b second interface 5 display control unit 6 display 7 system control unit 8 DSP 9 codec 10 charging circuit 11 secondary battery 12 step-up circuit 13 external AC adapter Terminal 14 Input / output terminal 16 Control switch 18 CD 20 Chip-shaped moisture-sensitive element 22, 24 Signal line 31 Chip-shaped moisture-sensitive element 32 Insulating substrate 33 Moisture-sensitive film 34 Comb-shaped electrode 35 Gap 36 Electrode 37 End face electrode 38 Electrode 39 Alumina substrate 40 Dividing groove 41 Strip-shaped body 42 Conductor 43 Individual product (electrode substrate)

Claims (12)

[Claims] 1. A portable electronic device which has a built-in power supply and is portable so that it can be taken out of the room. The functional block provides a predetermined function by supplying power from the power supply; A portable electronic device comprising: a chip-shaped moisture-sensitive element which is surface-mounted on a circuit board for protection and senses humidity in a housing. 2. The portable electronic device according to claim 1, wherein, based on humidity data from the chip-shaped moisture-sensing element, when the humidity in the housing exceeds a predetermined threshold, the humidity in the housing is changed. A portable electronic device, comprising: a protection circuit that cuts off power supply from the power supply to the functional block until the power supply falls below the threshold. 3. The portable electronic device according to claim 1, wherein the power supply is a secondary battery detachable from the housing. 4. The portable electronic device according to claim 3, wherein the chip-shaped moisture sensitive element is provided on the secondary battery side. 5. The portable electronic device according to claim 2, wherein the protection circuit includes a warning unit that issues a warning when the relative humidity in the housing exceeds approximately 80%. A portable electronic device, comprising: 6. The portable electronic device according to claim 1, wherein said functional block has a mobile communication function. 7. The portable electronic device according to claim 1, wherein said chip-shaped moisture-sensitive element is obtained by dispersing conductive particles in a water-absorbing polymer between a pair of electrodes. The water-absorbing polymer has a polyetheramine having two or more amino groups and a polymer of an epoxy compound having two or more epoxy groups and further having an ether bond. A portable electronic device, comprising: 8. The portable electronic device according to claim 1, wherein said chip-shaped moisture-sensitive element comprises conductive particles dispersed in a water-absorbing polymer between a pair of electrodes. Water-absorbing polymer, a polyetheramine having two or more amino groups, an epoxy compound having two or more epoxy groups, and further having an ether bond, Portable electronic equipment characterized by being a polymer with nylon. 9. The portable electronic device according to claim 1, wherein the chip-shaped moisture-sensitive element is obtained by dispersing conductive particles in a water-absorbing polymer between a pair of electrodes. The water-absorbing polymer has a polyetheramine having two or more amino groups, and a polyetheramine having two or more epoxy groups, and is further polymerized with an epoxy compound having an ether bond. A portable electronic device, which is a mixture of a product and a water-soluble nylon. 10. The portable electronic device according to claim 1, wherein the chip-shaped moisture-sensitive element comprises conductive particles dispersed in a water-absorbing polymer between a pair of electrodes. A portable electronic device having a moisture-sensitive film, wherein the water-absorbing polymer is a polyetheresteramide. 11. The portable electronic device according to claim 1, wherein the chip-shaped moisture-sensitive element comprises conductive particles dispersed in a water-absorbing polymer between a pair of electrodes. Having a moisture-sensitive film, wherein the water-absorbing polymer is a polyetheresteramide,
A portable electronic device comprising a polymer of a water-soluble nylon and an epoxy compound having two or more epoxy groups. 12. The portable electronic device according to claim 1, wherein the chip-shaped moisture-sensitive element has conductive particles dispersed in a water-absorbing polymer between a pair of electrodes. Having a moisture-sensitive film, wherein the water-absorbing polymer is a polyetheresteramide,
A portable electronic device characterized by being a mixture with water-soluble nylon.