Patent Publication Number: US-2004047244-A1

Title: Portable information device

Description:
BACKGROUND OF THE INVENTION  
       [0001] 1. Field of the Invention  
       [0002] The present invention relates to portable information devices, such as cellular telephones and personal digital assistants (PDAs), in which mechanical analog indication is performed to enhance suitability to user preferences and to add a quality appearance.  
       [0003] 2. Description of Related Art  
       [0004] The related art includes flip cell phones in which a screen display section and an operating section are connected together by a hinge structure, thereby providing a structure that opens and closes. The flip cell phones have an image display section made of a liquid-crystal display panel or an organic electro-luminescence (EL) panel and an operating section including a plurality of buttons and a jog dial on the side that acts as a mouthpiece when the casing is opened. Also, a relatively small image display section can be provided on a surface opposite to the image display section so that information can be displayed even when the casing is closed. The small image display section principally displays remaining electric power, the condition of a radio wave, an incoming call indication, a digital watch and so on. The small image display section is provided to a relatively expensive cellular telephone.  
       SUMMARY OF THE INVENTION  
       [0005] Due to the recent widespread use of cellular telephones, many users no longer rely on watches. A watch (digital display or analog display) displayed on a small screen display section or a main image display section of a cellular telephone is often used by the users for the purpose of knowing time. The scene of a person using a cell phone placed on a table as a watch has become common in popular cafés and other places.  
       [0006] The related art flip cell phones, however, display time on liquid-crystal display panels or organic EL panels, and lack an upscale image or fashionable appearance. Also, at present, time is displayed in small digital form on the small image display section on the outer surface of the casing, which provides less sufficient viewability. On the other hand, it is advantageous to reduce power consumption with the realization of a high image quality and a multifunction of portable information devices, such as full-color display and moving-image distribution.  
       [0007] In order to address or achieve the above, a flip portable information device having a foldable casing according to the present invention is equipped with a mechanical time-watch on the side that becomes the outer side of the casing when the casing is closed.  
       [0008] Since related art portable information devices (particularly, cellular telephones) use displays, such as liquid-crystal display panels and organic EL panels, the image display sections on the outside of the casing of such devices also use such displays. Therefore, the casings do not generally have watches that use mechanical hand indication. Employing such mechanical watches (typically, analog watches) gives the portable information devices more upscale images and unmechanical fashionable images. This also gives such devices a more fashionable appearance, which makes them more marketable commercially. The watches may be either quartz watches or mechanical watches if only mechanical time indication is provided. Also, either analog display or digital display is acceptable.  
       [0009] According to the present invention, a flip portable information device having a foldable casing includes an analog watch on the side that becomes the outer side of the casing when the casing is closed. The analog watch easily provides high decorativeness and high quality. Also, it is very innovative and original in combination with the portable information device. In the above structure, the arrangement of an analog or mechanical watch on the outside of the casing, which corresponds to the back of the display, facilitates fashionable and more-legible time indication.  
       [0010] The portable information device according to the invention is provided such that the time indication by the mechanical time-watch or the analog watch is made in synchronization with time indication on the display. Accordingly, the same time as that indicated on the display can be viewed on the foldable (flip) casing without the need to open the casing to see the time. As an example of usage, it is also possible that the time advanced or delayed from a correct time is set and displayed on the watch with the correct time displayed on the display. In other words, the time shifted from the correct time by a predetermined time and the correct time can be syncronized, which allows various practical uses as necessary.  
       [0011] In such an arrangement, the portable information device according to the invention is provided such that the watch is a radio controlled watch that automatically corrects time. According to the invention, time is automatically corrected regularly with fixed frequency, so that accurate time display with a reduced or minimum error can be seen on the portable information device.  
       [0012] In the above arrangement, the watch and the portable information device have a common power source. In other words, since the power consumption of the watch is extremely smaller than that of the portable information device, there is no need to have a separate power source for the watch, so that it is preferable to share the power source with the portable information device.  
       [0013] In the above arrangement, the analog watch moves the hands in response to the reception of an incoming e-mail or an answerphone message. Moving the hand of the analog watch in response to the incoming of e-mail or the like allows the incoming to be checked even when the portable information device is closed. Also, the entire movement is attractive, so that the user can also enjoy it visually.  
       [0014] In the above arrangement, the analog watch displays the remaining power with the position of the hand. Specifically, the remaining quantity in a power reserve device is indicated by hand. On the other hand, the related art portable information devices have so small remaining-power indication that it is hard to view, and generally indicate the remaining power in three levels, providing no detailed indication. Therefore, the indication by hand allows remaining power to be easily viewed and displayed in detail.  
       [0015] In the above arrangement, the watch further includes a self-generation device to convert the rotation of an oscillating weight to electricity. In the portable information device according to the invention with the above arrangement, the electricity generated by the self-generating device is supplied to the circuit of a telephone.  
       [0016] If the remaining power in the portable information device is depleted and insufficient for telephone operation, it may be difficult to charge the telephone away from home. However, power generated by the self-generating device is supplied not only to the watch but also to the circuit of the portable information device, so that the telephone temporarily becomes available. This makes telephone call or e-mail available even in case of urgent necessity.  
       [0017] In order to address or achieve the above, according to the invention, the flip portable information device having a foldable casing includes a mechanical time-watch or an analog watch on the side that becomes the outer side of the casing when the casing is closed. The watch indicates the functional information of the portable information device with hand or mechanically, in addition to the time indication.  
       [0018] The portable information device according to the invention is provided such that a dial plate of the watch includes an area to indicate the functional information of the portable information device with hand or mechanically, separately from the time indication. A plurality of the areas to provide the hand or mechanical indication may be arranged apart from each other, separately from the analog time-watch on the same dial plate.  
       [0019] In the above arrangement, the portable information device according to the invention is provided such that the watch indicates the information on an incoming e-mail or an incoming answerphone with hand or mechanically. Moving the hand of the analog watch with the incoming of e-mail allows the incoming to be checked even when the portable information device is closed. Also, the entire movement is attractive, so that the user can enjoy it visually.  
       [0020] In the above arrangement, the portable information device according to the invention is provided such that the watch provides stepwise remaining-power indication with hand or mechanically depending on the remaining power. Specifically, the remaining quantity in a power reserve device is indicated with hand. On the other hand, the related art portable information devices have so small remaining-power indication that it is hard to view, and generally indicate the remaining power in three levels, providing no detailed indication. Therefore, the indication by hand allows remaining power to be easily viewed and displayed in detail.  
       [0021] The portable information device according to the invention is provided such that the watch provides stepwise receiving-sensitivity indication with hand or mechanically depending on the receiving sensitivity of the communication function. The levels of the receiving sensitivity in various receiving environments are indicated with hand or mechanically, which are generally viewed only on an inside display in the related art flip portable information devices. In general, they provide three-level indication, providing no detailed indication. Accordingly, the indication with hand allows receiving-sensitivity level in the use environment to be easily viewed and displayed in detail, thus allowing grasping the condition.  
       [0022] In order to address or achieve the above, the flip portable information device having a foldable casing includes a mechanical time-watch or an analog watch on the side that becomes the outer side of the casing when the casing is closed. The watch and the portable information device have a common power source. In other words, since the power consumption of the watch is extremely smaller than that of the portable information device, there is no need to have a separate power source for the watch, so that it is preferable to share the power source with the portable information device.  
       [0023] The portable information device according to the invention includes a solar battery as an auxiliary power source. According to the invention, the power consumption of the main power source (battery) can be reduced and light energy can be converted to electrical energy for storage by a solar battery, so that power necessary to operate the mechanical time-watch or the analog watch can be sufficiently supplied. The constant charge with the solar battery allows semipermanent operation of the watch.  
       [0024] In the above arrangement, the portable information device according to the invention is provided such that the watch includes a self-generation device to convert the rotation of an oscillating weight to electricity. In the above arrangement, the portable information device according to the invention is provided such that the electricity generated by the self-generating device is supplied to the circuit of the telephone.  
       [0025] If the remaining power in the portable information device is depleted and insufficient for telephone operation, it may be difficult to charge the telephone away from home. However, the power generated by the self-generating device is supplied not only to the watch but also to the circuit of the portable information device, so that the telephone temporarily becomes available. This makes a telephone call or e-mail available in the case of an urgent necessity. 
     
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
     [0026]FIGS. 1A and 1B are perspective views of a cellular telephone according to a first exemplary embodiment of the present invention;  
     [0027]FIG. 2 is a sectional view of the cellular telephone shown in FIGS. 1A and 1B;  
     [0028]FIG. 3 is a schematic of the cellular telephone shown in FIGS. 1A and 1B;  
     [0029]FIG. 4 is a schematic showing the arrangement of an analog quartz watch;  
     [0030] FIGS.  5 A- 5 C are schematics of an operation example of the analog quartz watch;  
     [0031]FIG. 6 is a chart of mode switching with a mode select button;  
     [0032]FIG. 7 is a schematic of exemplary modifications of the cellular telephone of FIGS. 1A and 1B;  
     [0033]FIG. 8 is a schematic of a power unit of the cellular telephone of the invention;  
     [0034]FIG. 9 is a schematic of a cellular telephone equipped with an analog quartz watch having the capability of a radio controlled watch that automatically collects time and so on;  
     [0035]FIG. 10 is a schematic showing the arrangement of another cellular telephone;  
     [0036]FIG. 11 is a cross-sectional view of an arrangement example of elements that constitute a digital display section shown in FIG. 10. 
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS  
     [0037] The present invention is further explained with reference to the drawings. The present invention is not limited by the following exemplary embodiments. The components of the exemplary embodiments include components that can easily be replaced by those skilled in the art or similar or substantially the same components.  
     [0038] [First Exemplary Embodiment] 
     [0039]FIGS. 1A and 1B are perspective views of a cellular telephone according to a first exemplary embodiment of the present invention. FIG. 2 is a sectional view of the cellular telephone shown in FIGS. 1A and 1B. FIG. 3 is a schematic of the cellular telephone shown in FIGS. 1A and 1B. The cellular telephone  100  includes a power source  2  acting as a secondary battery, a circuit board  3  to control the cellular telephone  100 , a display  4  to display information, such as a liquid-crystal display panel and an organic EL panel, and a movement  5  of an analog quartz watch  50  in a casing  1 . Employing such a mechanical display watch (typically, an analog watch) for a potable information device adds a quality appearance to the portable information device, thus easily providing high decorativeness and an upscale image. The casing  1  has a flip structure divided by a hinge  6  into two pieces, having a display  4  and a speaker  7  on the display side  1   a  and an operation panel (operation keys)  8  and a microphone  9  on the operating side  1   b , as shown in FIG. 1B. The circuit board  3  is housed mainly in the display side  1   a  and the power source  2  is housed in the operating side  1   b.    
     [0040] An analog quartz watch  50  is provided on the outer surface of the display side  1   a  of the casing  1 , that is, on an outer surface  1   c  with the casing  1  closed, in other words, on the outer surface of the casing which corresponds to the back of the display  4 , as shown in FIG. 1A. The power source of the analog quartz watch  50  is common with the power source  2  of the cellular telephone  100 . The analog quartz watch  50  includes a so-called small second  52  added to a two-hand analog display section  51 , as in the drawing. A crown  53  and a mode select button  54  are arranged on a side  1   d  of the casing  1 . In place of the two-hand analog display section  51 , an analog quartz watch having a three-hand analog display section or a one-hand analog display section may be provided. It is also possible to provide various functions, such as a Greenwich mean time (GMT), a chronograph, a power reserve, a moon phase, and an electronic or mechanical alarm. Also, a digital display section  55  may be disposed together with the analog display section  51  (a combination quartz watch), as shown in FIG. 1A. In such a case, the digital display section  55  may provide various indications such as date, week, e-mail receiving, and the condition of a radio wave. Furthermore, the casing  1  may have a lamp  56  to alert the reception of a telephone call or an e-mail on the outer surface thereof.  
     [0041] Recent popular watches include an altimeter, a thermohygrometer, a compass, a tidal gauge, and a stop watch which are preferable for outdoor activities and sports, such as trekking and skiing. The cellular telephone  100  may include a sensor and an electronic circuit for such functions, the indication of which may be made with the analog quartz watch  50 . The altitude may be indicated by a minute hand or an hour hand, the temperature by a minute hand or an hour hand, and the humidity by an hour hand or a minute hand (not shown). Also, the N pole of the compass may be indicated by a minute hand or an hour hand. Hands dedicated for the indication may also be provided.  
     [0042] The movement of the analog quartz watch derives its supply of electricity from the power source  2  of the cellular telephone  100 . In general, the power consumption of analog quartz watches is extremely lower than that of the conventional cell phones, thus exerting no bad effects on the power consumption of the cellular telephone  100 . The display  4  displays a digital or analog watch  10 . The watch  10  on the display  4  and the analog quartz watch  50  on the outer surface  1   c  coincide with each other all the time. In other words, a correcting section  57  of the movement  5  of the analog quartz watch  50  and a correcting section  58  of the circuit board  3  are connected with each other. When the time of the analog quartz watch  50  is corrected, also the time of the watch  10  on the display  4  is automatically corrected in synchronization with the correcting action. On the other hand, also when the time of the watch  10  on the display  4  is corrected, the time of the analog quartz watch  50  is automatically corrected in synchronization with the correcting action.  
     [0043]FIG. 4 is a schematic showing the arrangement of an analog quartz watch. The analog quartz watch  50  includes a related art or known quartz oscillator  501 , an oscillating circuit  502 , a frequency divider circuit  503 , a driving circuit  504 , a step motor  505 , a fifth wheel  506 , a fourth wheel  507 , a third wheel  508 , a center wheel  509 , a minute wheel  510 , and an hour wheel  511 . The fourth wheel  507  has a second hand  512 , the center wheel  509  has a minute hand  513 , and the hour wheel  511  has an hour hand  514 , respectively. The arrangement of the analog quartz watch  50  is not limited to that shown in the drawing, but all of the related art or known arrangements of the analog quartz watch  50  can be employed. Although the power source of the analog quartz watch  50  shares the power source  2  with the cellular telephone  100 , an ordinary button battery or solar battery may be used as the power source of the analog quartz watch  50 .  
     [0044] It is also possible to make the hands  512 ,  513 , and  514  of the analog quartz watch  50  operate as shown in FIGS.  5 A- 5 C. In order to operate the hands  512 ,  513 , and  514  independently, it is necessary to provide each of the hands  512 ,  513 , and  514  with a step motor and a prescribed train wheel in the movement  5 . For example, when the cellular telephone  100  has received an e-mail, the minute hand  513  is turned clockwise and the hour hand  514  indicates the number of incoming e-mails, as shown in FIG. 5A. The indication of the minute hand  513  and the hour hand  514  may be reversed. In this case, since the hour hand points at “2,” the number of incoming e-mails is two. When there is provided the digital display section  55 , the word, Mail, is displayed on the digital display section  55 .  
     [0045] When an answerphone message is given, the minute hand  513  is turned counterclockwise and the number of answerphone messages is indicated by the hour hand  514 , as shown in FIG. 5B. The indications of the minute hand  513  and the hour hand  514  may be reversed. In this case, since the hour hand  514  points at “4,” the number of messages is four. When there is provided the digital display section  55 , the word, Message, is displayed on the digital display section  55 . Similarly, remaining electric power (the amount of power remaining in the power source  2  of the cellular telephone  100 ) is indicated by the minute hand  513  (or the hour hand  514 ). When “6” is pointed at, the power source  2  is in full charge condition. When “12” is pointed out, the power source  2  has no remaining power. When there is provided the digital display section  55 , the word, Power Reserve, is displayed on the digital display section  55 . The related art cell phones indicate the indication of remaining power in three levels. However, the continuous indication by hand allows remaining power to be checked and viewed in detail. More specifically, it is recommended to receive information on the amount of electric power remaining in the power source  2  from the circuit board  3  and to drive the step motor  505  correspondingly, thereby turning the minute hand  513 . With such a mechanical operation, the user can be provided with necessary information and pleasure. The operations of the hands  513  and  514  in the case of an e-mail and answerphone are not limited to those shown in the drawings.  
     [0046] A time indication  11 , an alarm indication  12 , and a power reserve indication  13  are switched at the push of the mode select button  54  of the analog quartz watch  50 , as shown in a chart of FIG. 6. With the alarm indication  12 , the alarm time can be set using the crown  53  (not shown). The analog quartz watch  50  sometimes includes the functions of world time, a stop watch, an altimeter, a thermohygrometer and so on. Even in such cases, the indication can be switched with the mode select button  54  (not shown).  
     [0047] The indication of the analog quartz watch may employ, for example, a one-hand analog display section  21  in which time is indicated by about 180°-angle turn of a hand  20 , as shown in one side of FIG. 7. Alternatively, it may be an analog display section  22  in which time is indicated by a bar indicator, as shown in the other side of FIG. 7. This can be achieved, for example, by providing a bar indicator  23  with a rack and a train wheel from the step motor with a pinion gear. Since the cellular telephone  100  only needs a mechanical indication in analog form by the analog quartz watch  50 , it may employ other various designs.  
     [0048] As described above, the cellular telephone  100  includes the analog quartz watch  50  on the outer surface of the casing  1 , thus having no mechanical feeling due to a liquid-crystal display but having a high-quality and fashionable appearance, and thus is viewed fashionably among users. Also, these features differentiate the cellular telephone  100  from other cellular telephones, the appearance being different at a glance, promoting the purchase by users who are sensitive to new products, and thus enhancing commercial marketability.  
     [0049] In the above example, the analog quartz watch  50  is given as an example. However, an analog mechanical watch may be provided. In this case, when the outer surface of the casing is formed in a skeleton structure so that the mechanism (a balance with hairspring, an escape wheel, a train wheel, a cam, a lever and so on) of the mechanical watch can be viewed from the exterior, a quality appearance can be increased. It is also possible to provide the casing outer surface  1   c  with a small window, through which a self-winding oscillating weight can be seen.  
     [0050] Preferably, a cellular telephone  200  includes a generator to convert mechanical energy into electric energy. The generator is primarily described below. An oscillating weight  31  is rotated around a rotation center  31   a . The center of gravity of the oscillating weight  31  and the rotation center  31   a  deviate greatly from each other, as shown in FIG. 8. Accordingly, when the watch is moved by the motion of an arm and so on, the oscillating weight  31  is subjected to a moment of a couple, thereby being rotated. The rotation is increased in speed by a gearwheel  32  and an intermediate gearwheel  33  fixed to the oscillating weight  31 , and is transmitted to a rotor  34  made of a permanent magnet. The rotor  34  has a stator  35  made of a highly magnetically permeable material therearound, being fixed to a highly magnetically permeable core  36 .  
     [0051] Coils  37   a  and  37   b  are wound around the core  36 . The coils  37   a  and  37   b  have diodes  38   a  and  38   b  as a rectifier device, respectively, as shown in FIG. 8. Reference numeral  30  denotes a high-capacitance electric double layer capacitor (hereinafter, referred to as a capacitor) acting as an electricity storage device. Reference numeral  39  designates an anti-overcharge circuit to reduce or prevent the overcharge of the capacitor  30 . The analog quartz watch  50  is activated by a driving circuit  59  to indicate time. With such an arrangement, when the oscillating weight  31  is rotated by the motion of an arm or the gravity, the rotation is transmitted to the rotor  34  at increased speed, and the rotor  34  is in turn rotated to induce magnetic flux that changes with the rotation of the rotor  34  to the stator  35  and the magnetic core  37 . The change of the magnetic flux induces alternate power to the coils  37   a  and  37   b  by the known action of electromagnetic induction, which is rectified by the diodes arranged one for each of the coils  37   a  and  37   b  and is stored in the capacitor  30 .  
     [0052] The electric power stored in the capacitor  30  may also be supplied to the circuit board  3  of the cellular telephone  200 . In general, after the power source  2  which is a secondary cell of the cellular telephone  200  has discharged electricity, the cellular telephone  200  becomes unavailable without a battery charger and an AC source. Therefore, the capacitor  30  and the circuit board  3  are connected together to supply the power of the capacitor  30  to the circuit board  3 . Since the power consumption of the circuit board  3  is higher than that of the analog quartz watch  50 , the capacity of the capacitor  30  is selected corresponding to the power consumption of the circuit board  3 . Since the capacity of the casing of the cellular telephone  200  is larger than that of a wrist watch, even the relatively large-sized capacitor  30  can be housed. Preferably, the power stored in the capacitor  30  can be used by the circuit board  3  only after the secondary battery has discharged electricity. More preferably, only those which require less power consumption, such as transmitting/receiving e-mails, can be used at that time.  
     [0053] A cellular telephone  300  shown in FIG. 9 is equipped with an analog quartz watch  350  having the function of a radio controlled watch which automatically corrects time and so on. The LF standard frequency and time signal that bears Standard Time information (time code) that is broadcasted by Communications Research Laboratory is called LF JJY, which is transmitted at a frequency of 40 KHz. Receiving, and detecting or demodulating it allows Standard Time information to be extracted, thus providing Japan Standard Time. Related art or known techniques of correcting time by the standard frequency and time signal include “Electronic Wave Correction Clock” disclosed in Japanese Unexamined Patent Application Publication No. 11-304973.  
     [0054] As shown in the drawing, the cellular telephone  300  includes a rod antenna  301  to receive the standard frequency and time signal, a receiving section  302  to selectively receive a predetermined frequency of 40 Hz to extract time code carried by the standard frequency and time signal, a time-information generating section  303  to generate present accurate time information from the time code, a correcting section  304  to correct the time of the analog quartz watch  350  of the cellular telephone  300  in accordance with the information from the time-information generating section  303 , a microcomputer  305  including the correcting section  304  and driving a step motor  505 , and a correcting section  306  to automatically correct the watch of the cellular telephone  300  in synchronization with the time correction of the analog quartz watch  350 .  
     [0055] The time code carried by the standard frequency and time signal is detected by the receiving section  302 . On the basis of the time code, the time-information generating section  303  generates accurate time and sends it to the microcomputer  305 . The microcomputer  305  compares the accurate time with the time of the analog quartz watch  350  and issues a correction command to the correcting section  304 . The correcting section  304  drives the step motor  505  by a predetermined amount in accordance with the correction command to correct display time mechanically. The correcting section  306  on the circuit board  3  corrects the time in synchronization with the correcting section  304  of the analog quartz watch  350  so as to agree with the time of the analog quartz watch  350 .  
     [0056] With the cellular telephone  300 , accurate time can always be provided, which is preferable when accurate time is required, such as stock exchange. For example, it is preferable for the Internet commerce, mobile banking and the like using i-mode (registered trade mark), EZweb or the like.  
     [0057]FIG. 10 is a schematic showing the arrangement of another cellular telephone. The cellular telephone  400  is an example of a mechanical digital display. As shown in the drawing, each element  402  in a digital display section  401  is shaped like a rod. Radial one-half  402   a  is colored in orange and a remaining half  402   b  is colored in the same color as its periphery, such as black. The each element  402  is magnetized in the radial direction and a casing  403  includes an electromagnet  404  (not shown) built-in for each element  402 . Controlling the direction of energization to the electromagnet  404  allows the each element  402  to be reversed. This allows mechanical and three-dimensional digital display which cannot be realized by a liquid-crystal display panel and an organic EL panel.  
     [0058] While the above exemplary embodiments have been described with an example of a cellular telephone, it is also possible to take a portable information device called a personal digital assistance (PDA), a portable personal computer, a digital still camera, a digital video camera, a liquid crystal television, a pager, an electronic databook, and an electronic calculator, in addition to the cellular telephone, for example. The casing may not be a flip type, but may be a casing having a sliding cover. In the case of a portable information device in which a main display is exposed by sliding the cover, the sliding cover may have a mechanical time-watch, such as the analog quartz watch.  
     [0059] [Advantages] 
     [0060] As described above, the portable information device according to the present invention is equipped with a mechanical time-watch on the side that becomes the outer side of the casing when the casing is closed, thus adding a high-quality and fashionable appearance. Also, the portable information device according to the invention is equipped with an analog watch, thus further adding a high-quality and fashionable appearance.  
     [0061] According to the portable information device of the invention, the same time as that indicated on a display can be viewed on a watch outside a foldable (flip) casing without the need to open the casing to see the time on the display. Also, the time advanced or delayed from a correct time is displayed on the watch and is synchronized with the correct time, with the correct time displayed on the display, which allows various practical uses as necessary.  
     [0062] According to the portable information device of the invention, time is automatically corrected at a regular frequency, so that accurate time indication with a minimum error can always be seen on the portable information device.  
     [0063] Furthermore, according to the portable information device of the invention, the analog watch moves the hand in response to the reception of an e-mail or answerphone message. Therefore, such an incoming message can easily be confirmed and the user can enjoy it visually.  
     [0064] According to the portable information device of the invention, the analog watch indicates the remaining power with the position of the hand, so that the remaining power is easy to view and can be displayed in detail.  
     [0065] According to the portable information device of the invention, the watch provides stepwise receiving-sensitivity indication with hand or mechanically depending on the receiving sensitivity of the communication function, so that the level of the receiving sensitivity in the use environment can easily be viewed and displayed in detail to allow grasping the condition.  
     [0066] According to the portable information device of the invention, the power consumption of the main power source (battery) can be reduced and light energy can be converted to electrical energy for storage by a solar battery, so that power necessary to operate the mechanical time-watch or the analog watch or the analog watch can be sufficiently supplied. The constant charge with the solar battery allows semipermanent operation of the watch.  
     [0067] According to the portable information device of the invention, the electric power that is generated by a self-generation device is supplied to the circuit of the telephone. This allows the telephone to be used even without electricity.