Abstract:
Disclosed are a portable electronic device that can change imaging instruction keys according to the position of the casing, and a control method therefor. The device is provided with an operating unit casing, an operating unit that has multiple keys, an assessment unit that assesses the position of the operating side casing, a setting unit that sets the prescribed keys in the operating part to be the imaging instruction keys that give instructions for imaging according to the position of the operating side casing assessed by the assessment unit, and a camera that performs imaging according to the imaging instructions from the imaging instruction keys that are set by the setting unit.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is the National Stage of International Application No. PCT/JP2010/001236, filed Feb. 24, 2010, which claims the benefit of Japanese Application No. 2009-040195, filed Feb. 24, 2009, the entire contents of all of which are incorporated by reference herein. 
     FIELD OF THE INVENTION 
     The present invention relates to a portable electronic device having an image capturing unit and a method for controlling the same. 
     BACKGROUND OF THE INVENTION 
     Conventionally, a portable electronic device such as a cellular telephone device having an operation unit and an image capturing unit are in widespread use. A portable electronic device has been proposed that includes an operation unit having a plurality of keys and an image capturing unit that captures an image in response to an image capturing instruction for capturing by way of the operation of certain keys at the operation unit (see Japanese Unexamined Patent Application, Publication No. 2007-233135, for example). 
     The portable electronic device disclosed in Japanese Unexamined Patent Application, Publication No. 2007-233135 includes an image capturing unit that captures an image in response to an image capturing instruction, a blur amount detection unit for detecting an amount of blur in the image capturing unit, an operation unit having a plurality of keys, and a key setting unit that obtains the amount of blur in the image capturing unit from the blur amount detection unit each time two or more keys among the plurality of keys are operated to set a key for which the amount of blur is small as the key for the image capturing command.
     [Patent Document 1] Japanese Unexamined Patent Application, Publication No. 2007-233135   

     SUMMARY OF THE INVENTION 
     Problems to be Solved by the Invention 
     However, when capturing an image by an image capturing unit in a cellular telephone device, it is often the case that the user has the body inclined at an angle for which it is easy to capture an image of an object to capture the image. However, it is often the case that the image capturing command key for performing an image capturing command by an image capturing unit is set to a specific key in an operation unit and cannot be changed from this specific key. Therefore, it may have been difficult to operate the image capturing command key depending on the attitude of the body (for example, inclination angle). 
     It is an object of the present invention to provide a portable electronic device that can change an image capturing command key depending on the attitude of a body and a method for controlling the same. 
     Means for Solving the Problems 
     The portable electronic device of the present invention includes: a body; an operation unit having a plurality of keys; a determination unit that determines an attitude of the body; a setting unit that sets predetermined keys among the plurality of keys in the operation unit as an image capturing command key for performing an image capturing command, according to the attitude of the body determined by the determination unit; and an image capturing unit that captures an image according to the image capturing command by way of the image capturing command key set by the setting unit. 
     Furthermore, it is preferable that the portable electronic device further comprising an inclination angle detection unit that detects an inclination angle of the body relative to a predetermined reference direction, wherein the determination unit determines the attitude of the body according to the inclination angle detected by the inclination angle detection unit. 
     Furthermore, it is preferable that wherein the setting unit sets a first key among the predetermined keys as the image capturing command key when the inclination angle is substantially 90 degrees clockwise when the body is seen from a face on which the operation unit is provided, and sets a second key, which is different from the first key, among the predetermined keys as the image capturing command key when the inclination angle is substantially 90 degrees anti-clockwise when the body is seen from a face on which the operation unit is provided. 
     Furthermore, it is preferable that wherein the plurality of keys is arranged on a face of the body in a rectangular shape with predetermined spacing, and the first key and the second key are located at corners of the face, respectively. 
     Furthermore, it is preferable that wherein, in the body, a key that is set as the image capturing command key is not provided on a lateral face that intersects the face. 
     Furthermore, it is preferable that wherein the setting unit sets a third key among the predetermined keys as the image capturing command key when the inclination angle is substantially 45 degrees clockwise when the body is seen from a face on which the operation unit is provided, and sets a fourth key, which is different from the third key, among the predetermined keys as the image capturing command key when the inclination angle is substantially 45 degrees anti-clockwise when the body is seen from a face on which the operation unit is provided. 
     Furthermore, it is preferable that further comprising an attitude setting unit that sets the attitude of the body in advance, wherein the determination unit determines the attitude of the body according to a setting of the attitude setting unit. 
     Furthermore, it is preferable that the portable electronic device further comprising a display unit that displays a selection menu for selecting a direction of the body when capturing an image by the image capturing unit, wherein the attitude setting unit sets attitude of the body according to the direction selected at the selection menu. 
     Furthermore, it is preferable that the portable electronic device wherein the body includes: a first body; a second body; and a connection unit that connects the first body and the second body to be openable and closable, and wherein the setting unit sets the predetermined keys as the image capturing command key in a state in which the first body and the second body are mutually opened. 
     Furthermore, it is preferable that the portable electronic device further comprising: a notification unit that performs notification in a predetermined mode; and a notification control unit that notifies of the image capturing command key being set by way of the notification unit in a predetermined mode, when the predetermined keys are set as the image capturing command key by the setting unit. 
     Furthermore, it is preferable that wherein the notification unit is a display unit, and wherein the notification control unit displays a location of the image capturing command key on the display unit in the predetermined mode. 
     Furthermore, it is preferable that wherein the notification unit is a back light of the plurality of keys, and wherein the notification control unit turns on a back light of the predetermined keys set as the image capturing command key or changes a color of the back light of the predetermined key set as the image capturing command key as the predetermined mode. 
     Furthermore, it is preferable that wherein the predetermined keys are input operation keys for inputting a character, numeral or symbol. 
     A method for controlling a portable electronic device of the present invention includes: a body and an operation unit having a plurality of keys, the method comprising: a determination step of determining an attitude of the body; a setting step of setting a predetermined key among the plurality of keys in the operation unit as an image capturing command key for performing an image capturing command, according to the attitude of the body determined in the determination step, and an image capturing step of capturing an image according to the image capturing command image by way of the image capturing command key set in the setting step. 
     Effects of the Invention 
     According to the present invention, it is possible to provide a portable electronic device that can change an image capturing command key depending on the attitude of a body and the method for controlling the same. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a cellular telephone device  1  in an opened state according to an embodiment of the present invention; 
         FIG. 2  is a perspective view of the cellular telephone device  1  in an closed state as seen from a back face  20 B of an operation unit side body  2 ; 
         FIG. 3  is a block diagram illustrating a function of the cellular telephone device  1 ; 
         FIG. 4  is a block diagram illustrating a function of the cellular telephone device  1  according to a first embodiment; 
         FIG. 5A  is a view illustrating the attitude of an operation unit side body  2  and a set location of an image capturing command key corresponding to the attitude; 
         FIG. 5B  is a view illustrating attitude of the operation unit side body  2  and a set location of an image capturing command key corresponding to the attitude; 
         FIG. 5C  is a view illustrating the attitude of the operation unit side body  2  and a set location of an image capturing command key corresponding to the attitude; 
         FIG. 6A  is a view illustrating the attitude of the operation unit side body  2  and a set location of an image capturing command key corresponding to the attitude; 
         FIG. 6B  is a view illustrating the attitude of the operation unit side body  2  and a set location of an image capturing command key corresponding to the attitude; 
         FIG. 6C  is a view illustrating the attitude of the operation unit side body  2  and a set location of an image capturing command key corresponding to the attitude; 
         FIG. 7  is a flowchart illustrating operations when capturing an image by a camera  231  according to the cellular telephone device  1  according to the first embodiment; 
         FIG. 8  is a block diagram illustrating functions of the cellular telephone device  1  according to a second embodiment; 
         FIG. 9  is a view illustrating a specific example of a selection menu displayed on a display unit  31  by way of a selection display unit  455 ; and 
         FIG. 10  is a flowchart illustrating operations when capturing an image by the camera  231  of the cellular telephone device  1  according to the second embodiment. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Hereafter, preferred embodiments for implementing the present invention are explained with reference to the drawings. Initially, a basic structure of a cellular telephone device  1  as an embodiment of a portable electronic device of the present invention is explained with reference to  FIGS. 1 and 2 .  FIG. 1  is a perspective view of the cellular telephone device  1  in an opened state according to an embodiment of the present invention.  FIG. 2  is a perspective view of the cellular telephone device  1  in an closed state as seen from a back face  20 B of an operation unit side body  2 . 
     The cellular telephone device  1  includes the operation unit side body (a first body)  2 , a display unit side body (a second body)  3  as bodies, and a connection unit  4  that connects the operation unit side body  2  with the display unit side body  3 . 
     As shown in  FIGS. 1 and 2 , the operation unit side body  2  is formed in a thin, substantially rectangular shape, and is mainly configured with a front case  2   a  constituting a front face  20 A as one face, a rear case  2   b  constituting a back face  20 B, and a battery cover  2   c . Furthermore, inside this operation unit side body  2  is provided a circuit board (not illustrated) in which a plurality of electronic components such as a control unit  45  that controls various operations of the cellular telephone device  1 , memory  44  that stores various information, and an acceleration sensor  46  (refer to  FIG. 3  for all) are mounted. 
     As shown in  FIG. 1 , an operation unit  21  through which predetermined input operations are performed and a microphone  22  are provided at the front face  20 A of the operation unit side body  2 . The front face  20 A faces the display unit body  3  when the cellular telephone device  1  is folded. 
     The operation unit  21  includes a plurality of keys. More specifically, the operation unit  21  includes a function setting operation key  13  for bringing various functions such as various settings, a telephone directory function, a mail function, and the like, and an input operation key  14  such as a numerical keypad for inputting numbers of a telephone number, characters of mail, and the like, for example, and a determination operation key  15  that performs determination in various operations, scrolling in up, down, left and right directions, and the like. 
     Furthermore, the function setting operation key  13 , the input operation key  14 , and the determination operation key  15  of the operation unit  21  are aligned with each other with a certain space on the front face  20 A of the operation unit side body  2 . 
     A predetermined function is assigned to each key constituting the operation unit  21  according to the opened or closed state of the operation unit side body  2  and the display unit side body  3  and type of application running (key assigning). In the cellular telephone device  1 , when a user presses the respective keys constituting the operation unit  21 , an operation is executed according to the function assigned to each key. 
     The microphone  22  is used for inputting sounds produced during a call by the user of the cellular telephone device  1 . 
     As shown in  FIG. 2 , a camera unit  23  and a speaker  24  as a sound output unit are provided at the back face  20 B of the operation unit side body  2 . The back face  20 B is located opposite the front face  20 A. Furthermore, a lateral face  20 C refers to a face intersecting the front face  20 A and the back face  20 B of the operation unit side body  2 . 
     The camera unit  23  includes a camera  231  (an image capturing unit) and a light  232 . The camera  231  is used for capturing an object to obtain image information. The light  232  irradiates light to an object to be captured by the camera  231 . 
     The speaker  24  outputs sounds for notifying the user of an incoming call or incoming mail to the cellular telephone device  1 . 
     As shown in  FIG. 1 , the display unit side body  3  is formed in a thick, substantially rectangular shape, and is mainly configured with a front case  3   a  and front panel  3   c  constituting a front face  30 A, and a rear case  3   b  constituting a back face. A display unit  31  for displaying various information and a receiver  32  for outputting sounds of the other party of a call are provided at the front face  30 A of the display unit side body  3 . The front face  30 A faces the operation unit side body  2  when the cellular telephone device  1  is folded. 
     The display unit  31  displays standby images during communications and calls, images based on an application that allows a predetermined function to operate. The receiver  32  outputs the sounds of the other part of a call. Furthermore, the display unit  31  and the receiver  32  are provided at a location hidden when the cellular telephone device  1  is in the closed state (an unexposed location). 
     A sub display unit (not illustrated) for displaying a variety of information is provided at a back face of the display unit side body  3 . The back face is located on an opposite side to the front face  30 A. That is to say, the sub display unit is provided at a location where it is exposed to the outside even if the cellular telephone device  1  is in the closed state. 
     Each of the display  31  and the sub display unit located at the display unit side body  3  is configured with a liquid crystal panel, a drive circuit that drives the liquid crystal panel, and a light source unit such as a back light that irradiates light from a back face side of the liquid crystal panel (none illustrated). 
     The connection unit  4  connects the operation unit side body  2  with the display unit side body  3  so as to move relative to each other. The connection unit  4  connects an upper end portion of the operation unit side body  2  with a lower end portion of the display unit side body  3 . By relatively rotating the operation unit side body  2  and the display unit side body  3  connected via the connection unit  4 , the cellular telephone device  1  can be set such that the operation unit side body  2  and the display unit side body  3  are in an opened state (an opened state) and in a folded state (a closed state) relative to each other. 
     Next, functions of the cellular telephone device  1  are explained with reference to  FIG. 3 .  FIG. 3  is a block diagram illustrating functions of cellular telephone device  1 . The cellular telephone device  1  includes the operation unit  21 , microphone  22 , communication unit  41 , image processing unit  42 , sound processing unit  43 , memory  44 , control unit  45 , acceleration sensor  46 , vibrator  47 , and camera  231  in the operation unit side body  2 . Furthermore, the cellular telephone device  1  includes a display unit  31 , receiver  32 , and driver IC  33  in the display unit side body  3 . 
     The communication unit  41  includes a main antenna  411  and an RF circuit unit  412 . The communication unit  41  performs predetermined communication with a destination thereof. Examples of destinations with which the communication unit  41  performs communication include an external terminal device that performs phone calls and receiving and sending of mails from/to the cellular telephone device  1  and an external device such as a web server that allows the cellular telephone device  1  to execute internet connection. 
     The main antenna  411  performs communication with an external device at a predetermined usable frequency band (for example, 800 MHz). The RF circuit unit  412  demodulates signals received by the main antenna  411  and supplies the demodulated signals to the control unit  45 . Furthermore, the RF circuit unit  412  modulates the signals supplied from the control unit  45  and sends them to an external device (a base station) via the main antenna  411 . 
     The image processing unit  42  executes predetermined image processing according to the control of the control unit  45  and outputs the processed image data to the driver IC  33 . The driver IC  33  stores the image data supplied from the image processing unit  42  in frame memory (not illustrated) and outputs to the display unit  31  at a predetermined timing. 
     The sound processing unit  43  executes predetermined sound processing on the signals supplied from the RF circuit unit  412  according to the control of the control unit  45 , and outputs the processed signals to the receiver  32  and the speaker  24 . 
     Furthermore, the sound processing unit  43  processes the signals inputted from the microphone  22 , and outputs the processed signals to the RF circuit unit  412 . The RF circuit unit  412  executes predetermined processing on the signals supplied from the sound processing unit  43 , and outputs the processed signals to the main antenna  411 . 
     The receiver  32  and the speaker  24  externally output the signals supplied from the sound processing unit  43  according to the control of the control unit  45 . 
     The memory  44  includes working memory, for example, and is used for arithmetic processing by the control unit  45 . Furthermore, data, tables, and the like used by various applications run on the cellular telephone device  1  are stored in the memory  44 . Furthermore, the memory  44  may be detachable external memory. 
     The control unit  45  controls the entirety of the cellular telephone device  1  and executes predetermined control over the control unit  41 , the image processing unit  42 , the display unit  31 , the sound processing unit  43 , the speaker  24 , the receiver  32 , the vibrator  47 , and the like. The specific configuration of the control unit  45  will be described later. 
     The acceleration sensor  46  detects a change in the position of the operation unit side body  2  as an acceleration value, and outputs it to the control unit  45 . The control unit  45  (an inclination angle detection unit  451  described later) detects the attitude of the operation unit side body  2  based on the acceleration value outputted by the acceleration sensor  46 . 
     The vibrator  47  is mounted inside the operation unit side body  2  and generates vibrations according to the control of the control unit  45 . The vibrations generated by this vibrator  47  are transmitted to the operation unit side body  2 , a result of which the cellular telephone device  1  vibrates. 
     First Embodiment 
     In the following, configurations and operations for realizing functions of the cellular telephone device  1  are described in detail. Initially, configurations for realizing the functions of the cellular telephone device  1  according to a first embodiment are explained with reference to  FIG. 4 .  FIG. 4  is a block diagram illustrating functions of the cellular telephone device  1  according to the first embodiment. 
     As shown in  FIG. 4 , the cellular telephone device  1  includes the acceleration sensor  46 , camera  231 , operation unit  21 , memory  44 , and control unit  45 . 
     The memory  44  stores an acceleration value outputted by the acceleration sensor  46 , an inclination angle of the operation unit side body  2  corresponding to the acceleration value, and the attitude of the operation unit side body  2  corresponding to the inclination angle to be associated with each other. 
     The control unit  45  includes an inclination angle detection unit  451 , determination unit  452 , setting unit  453 , and notification control unit  454 . The inclination angle detection unit  451  detects an inclination angle of the operation unit side body  2  with respect to a predetermined reference direction. More specifically, when an acceleration value is output by the acceleration sensor  46 , the inclination angle detection unit  451  refers to the memory  44 , reads an inclination angle of the operation unit side body  2  that stored to be associated with the acceleration value outputted by the acceleration sensor  46  to detect the actual inclination angle of the operation unit side body  2 . It should be noted that a predetermined reference direction is described later. 
     The determination unit  452  determines the attitude of the operation unit side body  2 . More specifically, the determination unit  452  determines the attitude of the operation unit side body  2  according to the inclination angle detected by the inclination angle detection unit  451 . In detail, the determination unit  452  determines the attitude of the operation unit side body  2 , which is stored to be associated with an inclination angle in the memory  44 , according to the inclination angle detected by the inclination angle detection unit  451 . 
     The setting unit  453  sets a predetermined key in the operation unit  21  as an image capturing command key to perform an image capturing command, according to the attitude of the operation unit side body  2  which is determined by the determination unit  452 . Furthermore, “image capturing command key” refers to a key (a shutter key) that performs an image capturing command when performing image capturing using the camera  231 . 
     When a predetermined key in the operation unit  21  is set as an image capturing command key by the setting unit  453 , the notification control unit  454  notifies of the fact that the image capturing command key has been set, by way of a notification unit in a predetermined mode. Here, for example, the display unit  31 , a back light (not illustrated) of each key at the operation unit  21  and the like functions as a notification unit. Furthermore, examples as the predetermined mode include displaying a location of the image capturing command key on the display unit  31 , turning on a back light of a predetermined key set as the image capturing command key, changing a color of a back light of a predetermined key set as the image capturing command key, and the like. 
     The camera  231  captures an image according to an image capturing command by way of the image capturing command key set by the setting unit  453 . 
     Next, a specific method for setting the image capturing command key by the setting unit  453  is explained with reference to  FIGS. 5A to 5C  and  6 A to  6 C.  FIGS. 5A to 5C  are views illustrating the attitude of the operation unit side body  2  and the set location of the image capturing command key corresponding to the attitude in a case of having the attitude of the operation unit side body  2  inclined to a direction substantially orthogonal to the reference direction D.  FIG. 5A  is a view illustrating a setting location of the image capturing command key in a case of the attitude of the operation unit side body  2  being in a direction substantially along the reference direction D. 
     Here, “the reference direction D” corresponds to a predetermined reference direction and refers to a direction which is the basis for the attitude of the operation unit side body  2  in which the camera  231  is disposed. More specifically, the reference direction D is a vertical direction, a horizontal direction, and the like. In addition, “an inclination angle of the operation unit side body  2 ” refers to an inclination angle of the operation unit side body  2  with respect to the reference direction D. For example, in a case of the reference direction D being the vertical direction, when a longitudinal direction of the operation unit side body  2  follows the vertical direction, the inclination angle thereof is 0 degrees. 
     As shown in  FIG. 5A , in a case that an inclination angle θ 0  is substantially 0 degrees when the operation unit side body  2  is seen from a face on which the operation unit  21  is provided, the setting unit  453  sets a select manipulation key  15  among predetermined keys in the operation unit  21  as the image capturing command key. That is to say, the setting unit  453  sets the select manipulation key  15  as the image capturing command key when the attitude of the operation unit side body  2  is in a direction substantially along the reference direction D. In addition, “an inclination angle θ 0  is substantially 0 degrees” refers to a specific range including 0 degrees, and more specifically, for example, refers to the inclination angle θ 0  with respect to the reference direction D falling in a the range of −10 degrees to 10 degrees. 
       FIG. 5B  is a view illustrating a setting location of an image capturing command key in a case in which the cellular telephone device  1  of  FIG. 5A  is rotated in a clockwise fashion to have attitude of the operation unit side body  2  inclined in a direction substantially orthogonal to the reference direction D. 
     As shown in  FIG. 5B , the setting unit  453  sets an input operation key (a first key)  14   a  among predetermined keys in the operation unit  21  as the image capturing command key when an inclination angle θ 1  is substantially 90 degrees clockwise when the operation unit side body  2  is seen from a face on which the operation unit  21  is provided. In other words, the setting unit  453  switches the image capturing command key from the select operation key  15  to the input operation key  14   a . In addition, “an inclination angle θ 1  is substantially 90 degrees clockwise” refers to a specific range including 90 degrees, and more specifically, for example, refers to the inclination angle θ 1  with respect to the reference direction D falling in a the range of 80 degrees to 100 degrees clockwise. 
       FIG. 5C  is a view illustrating a setting location of the image capturing command key in a case in which the cellular telephone device  1  of  FIG. 5A  is rotated in an anti-clockwise fashion to have the attitude of the operation unit side body  2  inclined in a direction substantially orthogonal to the reference direction D. 
     As shown in  FIG. 5C , the setting unit  453  sets an input operation key (a second key)  14   b , which is different from the input manipulation key  14   a , among predetermined keys in the operation unit  21 , as the image capturing command key when an inclination angle θ 2  is substantially 90 degrees anti-clockwise when the operation unit side body  2  is seen from a face on which the operation unit  21  is provided. In other words, the setting unit  453  switches the image capturing command key from the select operation key  15  to the input operation key  14   b . In addition, “an inclination angle θ 2  is substantially 90 degrees anti-clockwise” refers to a specific range including 90 degrees, and more specifically, for example, refers to the inclination angle θ 2  in an image capturing direction D 2  with respect to the reference direction D falling in a the range of 80 degrees to 100 degrees in the anti-clockwise direction. 
     As shown in  FIGS. 5B and 5C , the input operation key  14   a  and the input operation key  14   b  that are set as the image capturing command key by the setting unit  453  are each located at a corner of the front face  20 A of the operation unit side body  2 . 
     In addition, in the operation unit side body  2 , a key set as the image capturing command key is not provided on the lateral face  20   c  that intersects the front face  20 A (see  FIGS. 1 and 2 ). 
     Next, a case of having the attitude of the operation unit side body  2  inclined in a direction sloped relative to the reference direction D is explained with reference to  FIGS. 6A to 6C .  FIGS. 6A to 6C  are views illustrating attitudes of the operation unit side body  2  and a setting location of the image capturing command key in a case of having the attitude of the operation unit side body  2  inclined in a direction sloped relative to the reference direction D. 
       FIG. 6A , similarly to  FIG. 5A  described above, is a view illustrating a setting location of the image capturing command key in a case in which the attitude of the operation unit side body  2  substantially follows the reference direction D. As shown in  FIG. 6A , in a case that an inclination angle θ 0  is substantially 0 degrees when the operation unit side body  2  is seen from a face on which the operation unit  21  is provided, the setting unit  453  sets a select operation key  15  among predetermined keys in the operation unit  21  as the image capturing command key. 
       FIG. 6B  is a view illustrating a setting location of an image capturing command key in a case in which the cellular telephone device  1  of  FIG. 6A  is rotated in a clockwise fashion to have attitude of the operation unit side body  2  inclined in a direction sloped relative to the reference direction D. 
     As shown in  FIG. 6B , the setting unit  453  sets an input operation key (a third key)  14   c  among predetermined keys in the operation unit  21  as the image capturing command key when an inclination angle θ 3  is substantially 45 degrees clockwise when the operation unit side body  2  is seen from a face on which the operation unit  21  is provided. In other words, the setting unit  453  switches the image capturing command key from the select operation key  15  to the input manipulation key  14   c . In addition, “an inclination angle θ 3  is substantially 45 degrees clockwise” refers to a specific range including 45 degrees, and more specifically, for example, refers to the inclination angle θ 3  in an image capturing direction D 2  with respect to the reference direction D falling in a the range of 35 degrees to 55 degrees in a clockwise direction. 
       FIG. 6C  is a view illustrating a setting location of the image capturing command key in a case in which the cellular telephone device  1  of  FIG. 6A  is rotated anti-clockwise to have the attitude of the operation unit side body  2  inclined in a direction sloped relative to the reference direction D. 
     As shown in  FIG. 6C , the setting unit  453  sets an input operation key (a fourth key)  14   d , which is different from the input operation key  14   c , among predetermined keys in the operation unit  21  as the image capturing command key when an inclination angle θ 4  is substantially 45 degrees anti-clockwise when the operation unit side body  2  is seen from a face on which the operation unit  21  is provided. In other words, the setting unit  453  switches the image capturing command key from the select operation key  15  to the input operation key  14   d . In addition, “an inclination angle θ 4  is substantially 45 degrees anti-clockwise” refers to a specific range including 45 degrees, and more specifically, for example, refers to the inclination angle θ 4  with respect to the reference direction D falling in the range of 35 degrees to 55 degrees in the anti-clockwise direction. 
     It should be noted that the ranges of the inclination angles θ 1  to θ 4  as mentioned above are merely examples and the invention of the present application is not limited thereto. 
     In addition, as shown in  FIGS. 5A to 5C  and  6 A to  6 C as mentioned above, the setting unit  453  sets a predetermined key as the image capturing command key at the operation unit  21  in a state in which the operation unit side body  2  and the display unit side body  3  are mutually opened (an opened state) when the camera  231  captures an image. 
     Next, the operation of the camera  231  according to the cellular telephone device  1  according to the first embodiment capturing an image is explained with reference to  FIG. 7 .  FIG. 7  is a flowchart illustrating operations when performing image capturing using the camera  231  of the cellular telephone device  1  according to the first embodiment. 
     In Step S 1 , the control unit  45  activates the camera  231  in response a predetermined operation of the operation unit  21 . A predetermined operation refers to pressing a camera activation key for activating the camera  231  in the operation unit  21 . 
     In Step S 2 , the inclination angle detection unit  451  detects the inclination angle of the operation unit side body  2  with respect to the reference direction D. 
     In Step S 3 , the determination unit  452  determines the attitude of the operation unit side body  2  according to the inclination angle detected by the inclination angle detection unit  451 . 
     In Step S 4 , the setting unit  453  sets a predetermined key in the operation unit  21  as the image capturing command key according to the attitude of the operation unit side body  2  which is determined by the determination unit  452 . 
     In Step S 5 , the notification control unit  454  notifies the image capturing command key set by the setting unit  453  in a predetermined mode by way of the notification unit. 
     In Step S 6 , the control unit  45  determines whether the image capturing command key set in Step S 4  has been pressed within a certain period. In a case of the image capturing command key having been pressed (Yes), the process advances to Step S 7 . On the other hand, in a case of the image capturing command key having not been pressed (No), the process advances to Step S 2 . 
     In Step S 7 , the camera  231  captures an image according to an image capturing command by way of the image capturing command key set in Step S 4 . 
     The following effects are exerted for example according to the cellular telephone device  1  of the first embodiment. The cellular telephone device  1  includes the operation unit side body  2 , the operation unit  21  having a plurality of keys, the determination unit  452  that determines the attitude of the operation unit side body  2 , the setting unit  453  that sets a predetermined key in the operation unit  21  as the image capturing command key for performing an image capturing command according to the attitude of the operation unit side body  2 , which is determined by the determination unit  452 , and the camera  231  that captures an image according to an image capturing command by way of the image capturing command key set by the setting unit  453 . 
     In this way, the cellular telephone device  1  sets a predetermined key among a plurality of keys in the operation unit  21  as the image capturing command key by way of the setting unit  453  according to the attitude of the operation unit side body  2 , which is determined by the determination unit  452 . Therefore, with the cellular telephone device  1 , since the image capturing command key is set at a location where a user can easily perform command for capturing an image according to the attitude of the operation unit side body  2 , it is possible to ideally perform image capturing by the camera  231 . 
     In addition, the cellular telephone device  1  further includes the inclination angle detection unit  451  that detects the inclination angle of the operation unit side body  2  with respect to the reference direction D, and the determination unit  452  determines the attitude of the operation unit side body  2  according to the inclination angle detected by the inclination angle detection unit  451 . In this way, the cellular telephone device  1  can detect the attitude of the operation unit side body  2  precisely and set an image capturing command key according to the attitude thus detected since it sets the attitude of the operation unit side body  2  according to an inclination angle detected by the inclination angle detection unit  451 . Therefore, the cellular telephone device  1  can ideally set the image capturing command key. 
     Here, in a case that an inclination angle is substantially 90 degrees clockwise or substantially 90 degrees anti-clockwise when the operation unit side body  2  is seen from a face on which the operation unit  21  is provided, it is often the case that the user captures an image using the camera  231  by holding four corners (an end portion opposite to the connection unit  4  of the operation unit side body  2  and an end portion opposite to the connection unit  4  of the display unit side body  3 ) of the cellular telephone device  1  (see  FIGS. 5B and 5C ). 
     According to the cellular telephone device  1  of the first embodiment, the setting unit  453  sets the input manipulation key  14   a  among predetermined keys in the operation unit  21  as the image capturing command key in a case that an inclination angle θ 1  is substantially 90 degrees clockwise when the operation unit side body  2  is seen from a face on which the operation unit  21  is provided. Furthermore, in a case that an inclination angle θ 2  is substantially 90 degrees anti-clockwise when the operation unit side body  2  is seen from a face on which the operation unit  21  is provided, the setting unit  453  sets the input manipulation key  14   b , which is different from the input manipulation key  14   a , among predetermined keys in the operation unit  21  as the image capturing command key. 
     In this way, for example, in a case of a user being left-handed, the image capturing command key is set to an input manipulation key  14   a , and in a case of a user being a right-handed, the image capturing command key is set to an input manipulation key  14   b . Therefore, regardless of a user&#39;s dominant hand, it is possible to set the image capturing command key to a location where the user can easily perform an image capturing command according to the attitude of the operation unit side body  2 . 
     Furthermore, according to the cellular telephone device  1  of the first embodiment, each of the input operation key  14   a  and the input operation key  14   b  set by the setting unit  453  is located at a corner of the front face  20 A of the operation unit side body  2 . In this way, for example, when capturing an image by way of camera  231  by holding four corners of the cellular telephone device  1  (see  FIGS. 5B and 5C ), it is possible to set the image capturing command key to a location where the user can easily perform command for capturing an image according to the attitude of the operation unit side body  2 , regardless of the user&#39;s dominant hand. 
     Furthermore, with the cellular telephone device  1  of the first embodiment, in the operation unit side body  2 , a key set as the image capturing command key is not provided on a lateral face  20 C that intersects the front face  20 A. However, according to the cellular telephone device  1  of the first embodiment, it is possible to set the image capturing command key to a location where the user can easily perform an image capturing command according to the attitude of the operation unit side body  2 , even if the thickness of the operation unit side body  2  and the display unit side body  3  is thin (for example, the total thickness of the operation unit side body  2  and the display unit side body  3  in an opened state is within 10 mm) and a side key as the image capturing command key cannot be provided on a lateral face of the operation unit side body  2  and the display unit side body  3 . 
     Furthermore, according to the cellular telephone device  1  of the first embodiment, the setting unit  453  sets the input operation key  14   c  among predetermined keys in the operation unit  21  as the image capturing command key when an inclination angle θ 3  is substantially 45 degrees clockwise when the operation unit side body  2  is seen from a face on which the operation unit  21  is provided. Furthermore, the setting unit  453  sets the input operation key  14   d , which is different from the input operation key  14   c , among predetermined keys in the operation unit  21  as the image capturing command key when an inclination angle θ 4  is substantially 45 degrees anti-clockwise when the operation unit side body  2  is seen from a face on which the operation unit  21  is provided. 
     In this way, it is possible to set the image capturing command key to a location where the user can easily perform an image capturing command, even if the inclination of the operation unit side body  2  is in a direction sloped relative to the reference direction D. 
     Furthermore, according to the cellular telephone device  1  of the first embodiment, the setting unit  453  sets a predetermined key as the image capturing command key in the operation unit  21  in a state in which the operation unit side body  2  and the display unit side body  3  are mutually opened (an opened state). In this way, it is preferably possible for a user to capture an image by way of the camera  231  in an opened state in which the operation unit side body  2  is likely to be inclined. 
     Furthermore, according to the cellular telephone device  1  of the first embodiment, the control unit includes the notification unit that performs notification in a predetermined mode and the notification control unit  454  that notifies, in a case of a predetermined key being set as the image capturing command key by the setting unit  453 , that this image capturing command key has been set, by way of the notification unit in a predetermined mode. Therefore, it is possible for the user to recognize the location of the image capturing command key based on the notification by the notification unit and to ideally perform image capturing using the camera  231 . 
     Second Embodiment 
     Next, a second embodiment of a cellular telephone device  1  of the present invention is explained. It should be noted that, in the explanation of the second embodiment, the same reference numerals are assigned to the same constituent elements as the first embodiment and the explanations thereof are abbreviated or omitted. The cellular telephone device  1  of the second embodiment is different from that of the first embodiment in the points of the cellular telephone device  1  of the second embodiment using not include the acceleration sensor  46 , not including the inclination angle detection unit  451 , differing in the configuration of the determination unit  452 , and including a selection display unit  455  and an attitude setting unit  456 , while the other configurations of the second embodiment are similar the first embodiment. 
     The cellular telephone device  1  of the second embodiment has a function of selecting the attitude of the operation unit side body  2  when capturing an image using the camera  231 . 
     In the following, configurations and operations for realizing the functions of the cellular telephone device  1  of the second embodiment are described in detail. First, the configuration for realizing functions of the cellular telephone device  1  according to the second embodiment is explained with reference to  FIG. 8 .  FIG. 8  is a block diagram illustrating functions of the cellular telephone device  1  according to the second embodiment. 
     The control unit  45  includes the determination unit  452 , the setting unit  453 , the notification control unit  454 , a selection display unit  455 , and an attitude setting unit  456 . It should be noted that, since the setting unit  453  and the notification control unit  454  have the same functions as in the first embodiment, explanations thereof are omitted. 
     The selection display unit  455  displays, on the display unit  31 , a selection menu for selecting the direction of the operation unit side body  2  when capturing an image using the camera  231 . The attitude setting unit  456  sets the attitude of the operation unit side body  2  in advance. More specifically, the attitude setting unit  456  sets the attitude corresponding to the direction of the operation unit side body  2  selected by the selection menu. 
     The determination unit  452  determines the attitude of the operation unit side body  2  when capturing an image using the camera  231  by selecting from the selection menu displayed on the display unit  31  by way of the selection display unit  455 , according to the setting in the attitude setting unit  456 . 
     Here, the selection menu displayed on the display unit  31  by way of the selection display unit  455  is explained providing specific examples.  FIG. 9  is a view illustrating a specific example of a selection menu displayed on a display unit  31  by way of the selection display unit  455 . As shown in  FIG. 9 , the selection display unit  455  displays a message  310  and a selection menu  311  on the display unit  31  when the camera  231  is activated. The selection menu  311  constitutes menus  312  to  314 . 
     More specifically, a message “select the direction when photographing” is displayed on the message  310  for allowing a user to pan attention to attitude of the operation unit side body  2  when capturing an image. 
     Furthermore, messages corresponding to the attitude of the operation unit side unit  2  are displayed on the menus  312  to  314 , respectively. More specifically, the menu  312  displays “vertical direction”, the menu  313  displays “right direction”, and the menu  314  displays “left direction”, respectively. Here, “vertical direction” corresponds to a case where the inclination angle θ 0  is substantially 0 degrees when the operation unit side body  2  is seen from a face on which the operation unit  21  is provided (see  FIG. 5A ). Furthermore, “right direction” corresponds to a case where the inclination angle θ 1  is substantially 90 degrees clockwise when the operation unit side body  2  is seen from a face on which the operation unit  21  is provided (see  FIG. 5B ). Furthermore, “left direction” corresponds to a case where an inclination angle θ 2  is substantially 90 degrees anti-clockwise when the operation unit side body  2  is seen from a face on which the operation unit  21  is provided (see  FIG. 5C ). 
     The determination unit  452  determines the attitude of the operation unit side body  2  by selecting any one of the menus from the selection menus  311  by way of a selection manipulation at the operation unit  21 . 
     Next, an operation when capturing an image using the camera  231  of the cellular telephone device  1  of the second embodiment is explained with reference to  FIG. 10 .  FIG. 10  is a flowchart illustrating operations when capturing an image using the camera  231  of the cellular telephone device  1  of the second embodiment. 
     In Step S 11 , the control unit  45  activates the camera  231  according to a predetermined operation by way of the operation unit  21 . 
     In Step S 12 , the selection display unit  455  displays the selection menu  311  (see  FIG. 9 ) on the display unit  31  for selecting the attitude of the operation unit side body  2 . 
     In Step S 13 , the determination unit  452  selects any one of the menus among the selection menus  311 . Then, the determination unit  452  determines the attitude of the operation unit side body  2  according to the selection menu thus selected. 
     In Step S 14 , the setting unit  453  sets a predetermined key in the operation unit  21  as the image capturing command key according to the attitude of the operation unit side body  2  determined by the determination unit  452 . 
     In Step S 15 , the notification control unit  454  notifies of the image capturing command key set by the setting unit  453 , by way of the notification unit in a predetermined mode. 
     In Step S 16 , the camera  231  captures an image according to the image capturing command by way of the image capturing command key set in Step S 14 . 
     The following effects are exerted according to the cellular telephone device  1  of the second embodiment, for example. The determination unit  452  determines the attitude of the operation unit side body  2  by selecting the attitude of the operation unit side body  2  when capturing an image using the camera  231 , according to the setting by the attitude setting unit  456 . In this way, for example, even in a case that the cellular telephone device  1  does not include the acceleration sensor  46 , it is possible to set the image capturing command key to a location where a user can easily perform an image capturing command according to the attitude of the operation unit side body  2  by determining the attitude of the operation unit side body  2  by way of the determination unit  452 . Accordingly, the user can ideally perform image capturing using the camera  231 . 
     In addition, the cellular telephone devices  1  of the abovementioned first and second embodiments are specifically effective in a case that thickness of the operation unit side body  2  and the display unit side body  3  is thin (for example, the total thickness of the operation unit side body  2  and the display unit side body  3  in a closed state is within 10 mm) and a side key as the image capturing command key cannot be provided on a lateral face of the operation unit side body  2  and the display unit side body  3 . 
     Although embodiments of the present invention are described above, the present invention is not limited to the abovementioned embodiments and can be modified as appropriate. 
     For example, although the inclination angle detection unit  451  in the cellular telephone device  1  according to the first embodiment detects an inclination angle of the operation unit side body  2  based on an acceleration value outputted by the acceleration sensor  46  and based on an inclination angle of the operation unit side body  2  stored to be associated with the acceleration value in the memory  44 , the present invention is not limited thereto. For example, the cellular telephone device  1  may detect an inclination angle of the operation unit side body  2  using an angle detection sensor. In addition, with the cellular telephone device  1  according to the first embodiment, although the reference direction D is in a longitudinal direction of the operation unit side body  2 , the present invention is not limited thereto. For example, for the cellular telephone device  1 , a predetermined direction of the operation unit side body  2  and the display unit side body  3  may be set as the reference direction D. 
     In addition, although the present invention is applied to the cellular telephone device  1  as a portable electronic device in the first and second embodiments, the present invention is not limited thereto. In other words, the present invention may be applied to another portable electronic device such as a PDA (personal digital assistant), laptop computer, digital camera, compact audio player, and the like. 
     EXPLANATION OF REFERENCE NUMERALS 
     
         
         
           
               1  cellular telephone device (portable electronic device) 
               21  operation unit 
               44  memory 
               45  control unit 
               46  acceleration sensor 
               231  camera (image capturing unit) 
               451  inclination angle detection unit 
               452  determination unit 
               453  setting unit 
               454  notification control unit 
               455  selection display unit