JP2007096849A - Mobile terminal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable terminal device capable of preventing overcharging by a photovoltaic panel and physical deterioration of the photovoltaic panel surface.
A first housing 1 and a second housing 2 are connected via a hinge portion 3. The hinge portion 3 has a first rotation shaft and a second rotation shaft 2 that are orthogonal to each other, and connects the two casings 1 and 2 so that they can be overlapped and reversed in the thickness direction. The photovoltaic panel 14 is arranged on one side of the front and back of the second housing 2. The second housing 2 can be appropriately selected from the superposition of the photovoltaic panel 14 facing the front and the superposition facing the back. When the battery 10 is overcharged, the photovoltaic panel 14 is turned to the back, and when the battery 10 is to be supplementarily charged, the photovoltaic panel 14 is turned to the front.
[Selection] Figure 1

Description

  The present invention relates to a mobile terminal device such as a mobile phone having a photovoltaic panel and a PDA (Personal Digital Assistants).

  Since mobile terminal devices such as mobile phones and PDAs are generally assumed to be carried outside, it is desired to use the built-in battery for a long time. However, since there is a limit to the increase in battery capacity, in this type of terminal device, it is expected to develop a charging technique that does not require an external power source as well as reducing the power consumption inside the device.

Conventionally, as a portable terminal device in order to respond to this, a photovoltaic panel (solar panel) is attached to the outer surface of one of the pair of housings that can be folded open and closed, and a sufficient amount of light such as sunlight is provided. In an environment that can be secured, a battery that can charge an internal battery through a photovoltaic panel has been devised (see Patent Document 1).
JP 2004-140521 A

  However, since this conventional portable terminal device is provided with a photovoltaic panel on the outer surface of the casing that can be folded and opened, the battery can be charged in a light environment when the casing is folded. It will always be continued. In this case, since charging by the photovoltaic panel is continued regardless of the remaining capacity of the battery, power generation is performed even when the battery is fully charged, which may lead to deterioration of the battery.

  Further, in the above-described conventional portable terminal device, the photovoltaic panel is always exposed to the outside of the casing, so that the photovoltaic panel is easily damaged or damaged by contact with a hard member, and thus the photovoltaic panel is physically damaged. If such deterioration occurs, there is a concern that the power generation efficiency decreases.

  Therefore, the present invention is intended to provide a portable terminal device that can prevent overcharging by the photovoltaic panel and physical degradation of the photovoltaic panel.

In order to solve the above-mentioned problem, the invention according to claim 1 of the present application includes a pair of casings, a first rotating shaft and a second rotating shaft orthogonal to each other, and the pair of casings. The pair of casings can be overlapped in the thickness direction by rotating the pair of casings around the first rotation axis, and the pair of casings around the second rotation axis. A hinge portion that enables the front and back of the one casing to be reversed by one rotation of the body, a photovoltaic member disposed on one surface of the one casing, and accompanying the power generation of the photovoltaic member Power supply means for supplying power to a battery or an electronic component provided in either of the pair of housings.
In this case, the pair of casings are pivotable so as to be opened and closed about the first rotation axis and can be stacked in the thickness direction, and one casing on which the photovoltaic member is disposed has the second rotation axis. It is pivoted so that it can be turned upside down. For this reason, when one casing is superimposed on the other casing in the thickness direction, the photovoltaic member is turned to the front (exposed) or turned to the back (to one casing) by the reversal rotation of one casing. Can be selected as appropriate.

According to a second aspect of the present invention, in the portable terminal device according to the first aspect of the invention, charging is performed according to the determination result of the charging necessity determining means for determining whether the battery needs to be charged and the charging necessity determining means. And an informing means for informing whether or not the information is necessary or unnecessary.
In this case, the user can perform charging and stop charging at an appropriate timing by receiving notification from the notification means.

According to a third aspect of the present invention, in the portable terminal device according to the second aspect of the present invention, the portable terminal device further includes a power generation state detection unit that detects a power generation state of the photovoltaic member, and the battery necessity determination unit It is determined that charging of the battery by the photovoltaic member is unnecessary when the power state is equal to or greater than one set value, and the notification means determines that the battery is greater than or equal to the first set value by the charge necessity determination means. When it is detected that the photovoltaic member is in a power generation state by the power generation state detection means, it is notified that charging of the battery by the photovoltaic member is unnecessary. And
In this case, the user can suitably stop charging when receiving a notification by the notification means when the battery is likely to be overcharged.

According to a fourth aspect of the present invention, in the portable terminal device according to the second aspect of the present invention, the portable terminal device further includes a power generation state detection unit that detects a power generation state of the photovoltaic power generation member, and the notification unit is provided by the charge necessity determination unit. When it is determined that the battery needs to be charged and the power generation state detection means detects that the photovoltaic member is in a non-power generation state, the fact that the photovoltaic member is necessary is notified. It is characterized by.
In this case, the user can suitably know that the battery has insufficient power and needs to be charged by the photovoltaic member by receiving notification from the notification means.

According to a fifth aspect of the present invention, in the portable terminal device according to the fourth aspect, when the notification unit determines that the battery is in a power state equal to or lower than a second set value by the charging necessity determination unit. When the power generation state detecting means detects that the photovoltaic member is in a non-power generation state, the fact that the charging is necessary is notified, and the battery is determined by the charging necessity determining means. When it is determined that the power state is equal to or lower than the third set value lower than the set value, the charging is necessary regardless of the state of charge of the photovoltaic member detected by the power generation state detecting means. Is notified.
In this case, when the photovoltaic power generation member is in the non-power generation state, notification by the notification means is performed at the stage where the power state of the battery has dropped below the second set value. Therefore, at this time, the user is notified by the notification means, and can quickly take measures against power shortage by setting the photovoltaic member in a power generation state. On the other hand, at the stage where the power state of the battery has dropped below the third set value, notification by the notification means is performed regardless of the power generation state of the photovoltaic member. Therefore, the user can receive the notification by the notification means and can rapidly charge from the photovoltaic member or the external power source.

A sixth aspect of the present invention is the portable terminal device according to any one of the third to sixth aspects, wherein the power generation state detecting means detects the power generation state based on a power generation voltage generated by the photovoltaic power generation member. Features.
In this case, the power generation state of the photovoltaic member can be suitably detected.

A seventh aspect of the present invention is the portable terminal device according to any one of the third to sixth aspects, wherein the power generation state detecting means is configured such that the pair of cases in the overlapping direction in the thickness direction and the one of the pair of casings. Based on the inverted state of the casing, the pair of casings are overlapped in the thickness direction, and one surface of the one casing where the photovoltaic member is disposed is opposed to the other casing. If it is determined that the photovoltaic power generation member is in a non-power generation state, the photovoltaic power generation member is detected to be in a non-power generation state.
In this case, the power generation state of the photovoltaic member is based on the overlapping state of the pair of casings and the front and back inverted state of one casing, and the pair of casings are overlapped in the thickness direction, and the photovoltaic member is disposed. If one of the front and back surfaces of one housing is determined to face the other housing, the photovoltaic member is detected to be in a non-power-generating state. Can be suitably detected with a simple configuration.

According to an eighth aspect of the present invention, in the portable terminal device according to any one of the second to seventh aspects, the determination of the battery power state by the charging necessity determining unit is based on a remaining voltage of the battery. It is characterized by performing.
In this case, the power state of the battery can be properly determined.

The invention according to claim 9 is the portable terminal device according to any one of claims 1 to 8, wherein one surface of the front and back surfaces of the one housing on which the photovoltaic member is disposed, and this surface Is provided with a contact suppressing member that suppresses contact between the photovoltaic member and the other housing on at least one of the surfaces of the other housing that can be disposed facing each other.
In this case, the contact of the photovoltaic member with the other housing can be suitably suppressed.

A tenth aspect of the present invention is the portable terminal device according to any one of the first to ninth aspects, wherein the battery is disposed in the other casing where the photovoltaic member is not disposed. To do.
In this case, the heat generated by the photovoltaic power generation member and the radiant heat from sunlight are hardly transmitted to the battery part.

  According to the present invention, when one casing is overlapped with the other casing, the photovoltaic member of the first casing can be appropriately directed to both the front side and the rear side. By directing the photovoltaic member toward the other casing when not required, it is possible to prevent physical deterioration such as overcharging by the photovoltaic member and damage to the photovoltaic member.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 to 4 are external views of a mobile phone as an example of a mobile terminal device according to the present invention. This mobile phone includes a first casing 1, a second casing 2, and a hinge section 3 that connects the two casings 1 and 2 in such a manner that they can be overlapped in the thickness direction. . The hinge portion 3 is rotatable in the overlapping direction around the first rotation shaft 4 with respect to the first rotation shaft 4 provided at the end of the first housing 1 and the first housing 1. And a second rotating shaft 6 for connecting the second housing 2 to the intermediate connecting body 5 so as to be rotatable in the front-back direction. The first rotating shaft 4 and the second rotating shaft 6 are orthogonal to each other, and the first housing 1 and the second housing 2 can be opened and closed by rotating in the overlapping direction around the first rotating shaft 4. The second casing 2 can be rotated with respect to the first casing 1 in the reverse direction.

A plurality of operation keys 7 that can be pressed such as a call key, an end key, and a numeric key are provided on the upper surface 1a of the first housing 1 (the overlapping surface with the second housing 2). . In addition, a charging port 9 for connecting a charging connection connector 8a of the charger 8 is provided on the end surface opposite to the hinge portion 3 of the first casing 1, and charging is performed inside the first casing 1. The battery 10 that can be used repeatedly is incorporated. A display unit 12 such as a liquid crystal display is provided on one surface (second surface) 11 of the front and back surfaces of the second housing 2, and the other surface (first surface) of the front and back surfaces of the second housing 2. ) 13 is provided with a substantially rectangular photovoltaic panel 14 (photovoltaic member) that generates power upon receiving light.
2 to 4 show a state in which the first casing 1 and the second casing 2 are rotated around the first rotation shaft 4 and overlapped with each other. 4, the other surface of the second housing 2 is directed outward by a reversing operation centered on the second rotation shaft 6, and the one in FIG. One surface of the housing 2 is directed outward.

  The first casing 1 and the second casing 2 have MR sensors (open / close detection means, front / back detection means) 15a, 15b, 15c, 15d (power generation state detection means) configured by pairs of magnets and magnetoresistive elements. ), And the MR sensor 15a, 15b, 15c, 15d can detect the open / closed state of the casings 1, 2. Specifically, magnetoresistive elements 15a and 15b are disposed on the left and right positions of the upper surface 1a of the first casing 1, and the second surface 11 of the second casing 2 is positioned on the left side of the display unit. The first magnet 15c is disposed on the left surface of the first surface 13 of the first surface 13 toward the photovoltaic panel 14, and the magnets 15c and 15d and the magnetoresistive elements 15a and 15b are disposed. Is detected to detect the open / closed state of the two casings 1 and 2 and the front / back state of the second casing 2. In addition, a pair of projections 30 projecting upward are provided on the upper surface of the first housing 1 on the side opposite to the hinge portion 3. When the projection 30 is in a closed state in which the second casing 2 is overlapped with the first casing 1, the projection 30 is separated from the display unit 12 and the photovoltaic panel 14 on the surfaces 11 and 13 of the second casing. It comes into contact with the disengaged position. The protrusion 30 prevents the photovoltaic panel 14 from interfering with the first casing 1 side when the second casing 2 is closed with the display unit 12 or the photovoltaic panel 14 turned down. In this embodiment, it is formed integrally with the first housing 1. The protrusion 30 constitutes a contact suppressing member and may be formed of a soft material having a buffering action.

  FIG. 5 shows a schematic configuration of this mobile phone. A controller 16 for controlling various functions and the like is provided inside the first housing. As shown in FIG. 1, the controller 16 has a key input circuit for processing a key operation signal of the operation key 7. 17, a display circuit 18 that processes a display signal of the display unit 12, a sound processing circuit 21 that processes a sound signal such as a speaker 19 (informing means) and a microphone 20, and a communication circuit for communication through an antenna 22. 23 and a camera control circuit 24 for controlling the built-in camera. The controller 16 is connected to a memory 25 in which programs and various values are stored, and is connected to a power supply control circuit 26 (power supply means) that controls power in the apparatus. A signal corresponding to the open / closed state of the housings 1 and 2 and the front / back state of the second housing 2 in the closed state is input.

  FIG. 6 shows a schematic configuration diagram centering on the controller 16 of the portion related to the power management of the cellular phone. As shown in the figure, the arithmetic unit 31 in the controller 16 receives the status signals of the casings 1 and 2 from the MR sensor 15 and the voltage signals Vb and Vs from the battery 10 and the photovoltaic panel 14, respectively. Then, by comparing these input signals Vb and Vs with various threshold values Vb1, Vb2, Vb3, and Vs1 stored in the memory 25 as appropriate, the necessity of charging the battery 10 using the photovoltaic panel 14 or the like is determined. to decide. And the control part 32 receives the output of the calculating part 31 which is the judgment result of the necessity of charge, and outputs the warning according to the output from the speaker 19. FIG. Accordingly, in this embodiment, the calculation unit 31 of the controller 16 constitutes a main part of the charging necessity determination unit, and the control unit 32 and the speaker 19 of the controller 16 constitute a main part of the notification unit.

In the case of this embodiment, the following warnings (1) to (3) are set for the speaker 19.
(1) A warning that prompts the photovoltaic panel 14 to stop charging when the battery 10 is in an overcharged state.
(2) A warning prompting rapid charging by the charger 8 when the remaining capacity of the battery 10 is greatly reduced.
(3) A warning prompting supplementary charging by the photovoltaic panel 14 when the remaining capacity of the battery 10 is reduced to a certain level or more.

The determination to perform the above warning (1) is made based on whether or not the voltage signal Vb of the battery 10 is equal to or higher than a full charge determination threshold value (first set value) Vb1 indicating a level close to a fully charged state, Further, whether or not the photovoltaic panel 14 is generating power ("generating" means that the photovoltaic panel 14 is in a chargeable power generation state) is determined by the photovoltaic panel 14. The determination is made based on whether or not the voltage signal Vs is equal to or greater than the photovoltaic power generation determination threshold Vs1. Therefore, in this embodiment, the power supply control circuit 26 that outputs the voltage signal Vs from the photovoltaic panel 14 and the calculation unit 31 of the controller 16 constitute a power generation state detection unit.
In addition, the determination to perform the warning of (2) above is a rapid indication that the voltage signal Vb of the battery 10 shows a level at which the remaining capacity is greatly reduced regardless of whether the photovoltaic panel 14 is generating power. Judgment is made based on whether the charge determination threshold value Vb3 (third set value) is not reached.
In addition, the determination to perform the warning (3) is based on whether or not the photovoltaic panel 14 is generating power and the voltage signal Vb of the battery 10 indicates a level at which the remaining capacity is reduced to a certain extent. Judgment is made by a composite judgment as to whether or not the charge judgment threshold value Vb2 (second set value) is not reached. The warning (3) is issued when the photovoltaic panel 14 is not generating power and the voltage signal Vb of the battery 10 is less than the auxiliary charge determination threshold value Vb2.
The magnitude relationship among the full charge determination threshold value Vb1, the quick charge determination threshold value Vb3, and the auxiliary charge determination threshold value Vb2 is Vb3 <Vb2 <Vb1, as shown in FIG. It matches the usable area of.

Hereinafter, the flow of warning processing by the controller 16 will be described in accordance with the flowcharts of FIGS. 8 and 9, divided into warning processing for stopping the charging of the photovoltaic panel 14 and warning processing for promoting charging by the photovoltaic panel 14 and the like.
<Charging stop warning process>
In FIG. 8, in step S101, it is determined whether or not the voltage signal Vb of the battery 10 is equal to or higher than the full charge determination threshold value Vb1, and the process proceeds to the next step S102 only when the voltage signal Vb is equal to or higher than the full charge determination threshold value Vb1. .
In step S102, it is determined whether or not the voltage signal Vs of the photovoltaic panel 14 is greater than or equal to the photovoltaic determination threshold value Vs1, that is, whether or not the photovoltaic panel 14 is generating power. If the power generation is in progress, the process proceeds to step 104. In step S103, when the battery is charged by the external power source using the charger 8, the charging by the charger 8 is completed, and when the charging by the external power source is not performed, the processing is ended as it is. In step S104, since power generation by the photovoltaic panel 14 is currently continued in a fully charged state, a warning sound is emitted from the speaker 19 to prompt the user to stop the power generation.

<Charging promotion warning process>
In FIG. 9, in step S <b> 201, based on a signal from the MR sensor 15, it is determined whether or not the casings 1 and 2 are not overlapped in the thickness direction and are in an open state (open state). When in the state, the process proceeds to step S202, and when the casings 1 and 2 are overlapped in the thickness direction and closed (closed state), the process proceeds to step S204.
In step S202, it is determined whether or not the voltage signal Vb of the battery 10 is less than the quick charge determination threshold value Vb3. If the voltage signal Vb is greater than or equal to the threshold value Vb3, the process returns to step S201, and if not, the process proceeds to the next step S203. Proceed with In step S <b> 203, a warning sound is emitted from the speaker 19 in order to prompt charging by an external power source using the charger 8. Note that the warning sound in step S203 is set to be different from the warning sound in step S104, and is set to a high volume, for example.
On the other hand, in step S204, it is determined whether or not the photovoltaic panel 14 is in the stoppage of power generation (the photovoltaic panel 14 is in the face down state) by comparing the voltage signal Vs of the photovoltaic panel 14 with the photovoltaic generation threshold value Vs1. If so, the process proceeds to step S202. If power generation is stopped, the process proceeds to step S205.
In step S205, it is determined whether or not the voltage signal Vb of the battery 10 is less than the auxiliary charge determination threshold value Vb2. If the voltage signal Vb is not less than the threshold value Vb2, the process returns to step S201, and if not, the process proceeds to the next step S206. Proceed with In step S206, a warning for prompting power generation by the photovoltaic panel 14, that is, a warning for directing the photovoltaic panel 14 to the front side is given through the speaker 19. Note that the warning sound in step S206 is also set to be different from other warning sounds.

  As described above, this mobile phone connects the first housing 1 and the second housing 2 so as to be openable and closable, and the second housing 2 can be turned upside down with respect to the first housing 1. Since the photovoltaic panel 14 is arranged on one side (first surface) 13 of the front and back surfaces of the second housing 2, when the charging is not required, the photovoltaic panel 14 side surface (first The two housings 1 and 2 can be overlapped and closed with the surface 13) of 1 being face down and facing the first housing 1. Therefore, by turning the photovoltaic panel 14 in the closed state, it is possible to prevent the battery 10 from being overcharged by continuing the power generation by the photovoltaic panel 14, and the photovoltaic panel 14 surface. Since this is not exposed, damage or damage due to contact with surrounding members can be prevented at the same time.

  Further, in this mobile phone, when charging is continued with the power generation of the photovoltaic panel 14 in the fully charged state, the user can be notified of this by a warning sound of the speaker 19 which is a warning means. The charging by the photovoltaic panel 14 can be quickly stopped by making the photovoltaic panel 14 face the first casing 1 or the like. When a warning is issued, light is not allowed to enter the photovoltaic panel 14 by covering the optical panel 14 or the like without the surface 13 on the photovoltaic panel 14 side facing the first housing 1. Thus, the charging can be stopped.

  In the mobile phone of this embodiment, the photovoltaic panel 14 generates power by using different charging determination thresholds Vb3 and Vb2 depending on whether the photovoltaic panel 14 is generating power or not. In this case, rapid charging is promoted with a lower threshold voltage Vb3 than when power generation is not being performed, and supplementary charging is promoted with a higher threshold voltage Vb2 when power generation is not being performed. It is possible to prompt charging at an appropriate timing without increasing the warning frequency more than necessary.

  In the case of this embodiment, since the photovoltaic panel 14 is disposed in the second casing 2, the battery 10 is disposed on the first casing 1 side. The radiant heat due to is difficult to be transmitted to the battery 10, and therefore, the deterioration of the battery 10 due to heat can be more effectively prevented.

  In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary. For example, in the above embodiment, a mobile phone has been described as an example of the mobile terminal device, but the mobile terminal device according to the present invention may be a PDA or the like. Further, the warning means is not limited to the warning means by sound using a speaker, but may be warning means by light using a light emitter, warning means by display display, vibration or the like.

  Further, in the above embodiment, the power generation state is detected based on the voltage signal Vs of the photovoltaic panel 14, but the overlapping state of the first casing 1 and the second casing 2 is as follows. Alternatively, the front / back inversion state of the second casing 2 may be detected, and the presence / absence (state) of power generation by the photovoltaic panel 14 may be estimated from these detection results. Specifically, the first casing 1 and the second casing 2 are in an overlapped state (closed state), and the surface of the second casing 2 on the photovoltaic panel 14 side (first surface). ) 13 is in a state of being opposed to the first casing 1 (a state where the photovoltaic panel 14 is not exposed), the photovoltaic panel 14 is in a non-generating state, and other states (photovoltaic generation) When the panel 14 is exposed), it can be estimated that the power generation state is present. In this case, the state detection of both housings 1 and 2 can be performed by, for example, the MR sensors 15a, 15b, 15c, and 15d.

  Further, the hinge portion connecting the first housing and the second housing may have a form other than the above as long as it has two axes orthogonal to each other. For example, the first rotating shaft supported by the first casing is provided so as to be orthogonal to the upper surface of the first casing, and the first casing and the second casing are kept substantially parallel, It is also possible to open and close both housings by rotating both housings around the first rotation axis.

1 is a plan view of a mobile phone in an open state according to an embodiment of the present invention. The top view of the mobile telephone which shows the same embodiment and folded the photovoltaic panel upwards. The top view of the mobile telephone which shows the same embodiment and folded the display part facing up. The side view of the mobile phone which shows the same embodiment and folded the photovoltaic panel facing up. The schematic circuit block diagram of the mobile telephone of the embodiment. FIG. 2 is a schematic configuration diagram of a portion related to power management centering on a controller of the embodiment. The diagram for demonstrating the battery voltage of the embodiment. The flowchart which shows the flow of control of the embodiment. The flowchart which shows the flow of control of the embodiment.

Explanation of symbols

1 ... 1st housing | casing (casing)
2 ... Second housing (housing)
DESCRIPTION OF SYMBOLS 3 ... Hinge part 4 ... 1st rotating shaft 6 ... 2nd rotating shaft 10 ... Battery 11 ... One side 13 ... The other side 14 ... Photovoltaic panel (photovoltaic member)
15a, 15b, 15c, 15d ... MR sensor (power generation state detection means)
16 ... Controller (charging necessity judgment means, power generation state detection means)
19 ... Speaker 26 ... Power supply control circuit (power supply means, power generation state detection means)
30 ... Protrusion (contact suppression member)
Vb1 ... Full charge judgment threshold (first set value)
Vb2 ... Supplementary charge determination threshold (second set value)
Vb3: Rapid charge determination threshold (third set value)

Claims (10)

A pair of housings;
The pair of housings having a first rotating shaft and a second rotating shaft that are orthogonal to each other are coupled to each other, and the pair of housings are rotated by turning the pair of housings around the first rotating shaft. A hinge portion that enables superimposition in the thickness direction of the pair of casings, and allows the one casing to be reversed by turning one of the pair of casings around the second rotation axis.
A photovoltaic member disposed on the front and back surfaces of the one housing;
And a power supply means for supplying power accompanying the power generation of the photovoltaic member to a battery or an electronic component provided in one of the pair of casings. Charging necessity determination means for determining whether the battery needs to be charged;
The portable terminal device according to claim 1, further comprising: a notification unit that notifies whether or not charging is necessary according to a determination result of the charging necessity determination unit. Power generation state detection means for detecting the power generation state of the photovoltaic member,
The charging necessity determining means determines that charging of the battery by the photovoltaic member is unnecessary when the battery is in a power state equal to or higher than a first set value.
The notifying unit detects that the battery is in a power state equal to or higher than the first set value by the charging necessity determining unit and that the photovoltaic member is in a power generation state by the power generation state detection unit. The mobile terminal device according to claim 2, further informing that charging of the battery by the photovoltaic member is unnecessary. Power generation state detection means for detecting the power generation state of the photovoltaic member,
The informing means determines that the battery needs to be charged by the charging necessity determining means, and the power generation state detecting means detects that the photovoltaic member is in a non-power generation state. The portable terminal device according to claim 2, wherein a notification is made that the photovoltaic member is necessary. The informing means determines that the photovoltaic member is in a non-power generation state by the power generation state detection means when it is determined by the charging necessity determination means that the battery is in a power state equal to or lower than a second set value. Is detected, the charging is notified, and the battery is determined to be in a power state equal to or lower than a third setting value lower than the second setting value by the charging necessity determination means. The mobile terminal device according to claim 4, wherein a notification is made that the charging is necessary regardless of a charging state of the photovoltaic member detected by the power generation state detecting means.   The portable terminal device according to claim 3, wherein the power generation state detection unit detects the power generation state based on a power generation voltage generated by the photovoltaic power generation member. The power generation state detecting means is configured to overlap the pair of casings in the thickness direction based on the overlapping state of the pair of casings in the thickness direction and the inverted state of the one casing, and the light. Detecting that the photovoltaic member is in a non-power generation state when it is determined that one of the front and back surfaces of the one housing where the power generation member is disposed is opposed to the other housing; The portable terminal device according to any one of claims 3 to 5, wherein The portable terminal device according to any one of claims 2 to 7, wherein the determination of the power state of the battery by the charging necessity determination unit is performed based on a remaining voltage of the battery. At least one of the front and back surfaces of the one housing on which the photovoltaic member is disposed and one surface of the other housing on which this surface can be disposed to face the photovoltaic member and the other housing The mobile terminal device according to claim 1, further comprising a contact suppression member that suppresses contact with the housing. The portable terminal device according to claim 1, wherein the battery is disposed in the other housing on which the photovoltaic member is not disposed.

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