JP2007184751A - Mobile electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide mobile electronic equipment which is improved in operability and made compact although the equipment is equipped with a detecting device and a light emitting device. <P>SOLUTION: A digital camera 10 includes a CPU 24, a recording medium 36 is accessed by an I/F circuit 34 when an access instruction is issued, and the CPU 24 changes the light emission quantity of an LED 50 emitting light according to the operation state of the I/F circuit 34. A phototransistor PT detects the intensity of external light. The lightness of a screen of an LCD panel 40 displaying information is controlled by a system controller 44 according to the detection result of the phototransistor PT. The control operation of the system controller 44 is limited by the CPU 24 when the light emission quantity of the LED 50 exceeds zero. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a portable electronic device, and more particularly to a portable electronic device equipped with an illuminance sensor that detects the intensity of external light, for example.

  An example of this type of conventional circuit is disclosed in Patent Document 1. According to this prior art, the light quantity of the light source 22 that illuminates the display screen of the reflective liquid crystal display 20 is adjusted based on the ambient brightness detected by the light detection sensor 40. This reduces power consumption.

An example of this type of conventional circuit is disclosed in Patent Document 2. According to this prior art, the system controller 100 is connected with a warning LED 25 that gives a notification (warning) that the memory card 17 is being accessed by flashing light emission. In this way, operability is improved by preventing an erroneous operation such as the memory card being erroneously attached or detached while accessing the memory card 17.
JP 2000-10068 [G02F 1/133, G03B 13/02, G09F 9/00, G09G 3/18, H04N 5/225] JP 2003-131304 A [G03B 17/04, 5/00, 17/02, 17/18, H04N 5/225]

  However, in the related art, when a portable electronic device is provided with a detection device provided for power saving of the display device and a light-emitting device provided for improving operability, the portable electronic device is large in order to ensure operability. Need to be made.

  SUMMARY OF THE INVENTION Therefore, a main object of the present invention is to provide a portable electronic device that can be downsized while improving operability while being provided with a detection device and a light emitting device.

  A portable electronic device (10) according to the invention of claim 1 includes a light emitting device (50) that emits light, a display device (40) that displays information, and a detection device (48) that detects the intensity of external light. In the electronic device (10), the access means (S57, S65, 34) for accessing the recording medium (36) when an access instruction is issued, and the light emission amount of the light emitting device (50) is changed according to the operating state of the access means Changing means (S77, S81), brightness control means (S29 to S47) for controlling the brightness of the screen of the display device (40) based on the detection result of the detection device, and the light emission amount of the light emitting device exceeds the threshold value It is characterized by comprising limiting means (S21, S75) for limiting the control operation of the brightness control means.

  The recording medium is accessed by the access means when an access instruction is issued. The changing means changes the light emission amount of the light emitting device that emits light according to the operating state of the access means. The intensity of outside light is detected by a detection device. The brightness of the screen of the display device that displays the information is controlled by the brightness control means based on the detection result of the detection device. However, the control operation of the brightness control means is restricted by the restriction means when the light emission amount of the light emitting device exceeds the threshold value.

  The operability can be improved by changing the light emission amount of the light emitting device according to the access state of the recording medium. In addition, power saving can be achieved by controlling the brightness of the screen of the display device in accordance with the intensity of external light. Furthermore, by limiting the brightness control means when the light emission amount of the light emitting device exceeds the threshold value, the detection device can be arranged in the vicinity of the light emitting device, and the size of the device can be reduced.

  The portable electronic device according to the invention of claim 2 is dependent on claim 1, and the changing means turns off the light emitting device in which the access operation of the access means is suspended, and the threshold value is zero. That is, if the light emitting device emits light even in a small amount, it is considered to be lit.

  According to a third aspect of the present invention, there is provided a portable electronic device according to the first or second aspect, wherein the access instruction includes a recording instruction and a reproduction instruction, and the access means performs a recording process in response to the recording instruction. S57) and reproduction processing means (S65) for executing reproduction processing in response to the reproduction instruction.

  A portable electronic device according to a fourth aspect of the present invention is dependent on any one of the first to third aspects, and includes a case (56) having an opening (58) for viewing the light emitting device and the detection device, and the case. The dial key (52) is further provided, and the opening also serves as a marker for dial key setting operation. This improves operability.

  The portable electronic device according to the invention of claim 5 is dependent on claim 4 and further includes a transparent cover (64) for closing the opening. Thereby, the light emitting device and the detection device are not exposed.

  A portable electronic device according to a sixth aspect of the invention is dependent on any one of the first to fifth aspects, wherein the brightness control means determines a change in brightness (S33, S35, S37, S43), a determination means. Change means (S41, S47) for changing the brightness in accordance with the determination, and waiting means (S39, S45) for waiting for a predetermined time from determination of the determination means to change of the change means. Thereby, the brightness of the screen of the display device is controlled.

  The portable electronic device according to the invention of claim 7 is dependent on claim 6, and the determining means has a hysteresis characteristic. As a result, the change of the brightness of the screen of the display device determined by the brightness control means is started as appropriate.

  An operation control program according to the invention of claim 8 is a processor for portable electronic equipment comprising a light emitting device (50) for emitting light, a display device for displaying information, and a detection device for detecting the intensity of external light. In addition, an access step (S57, S65) for accessing the recording medium (36) when an access instruction is issued, and a change step (S77, S81) for changing the light emission amount of the light emitting device (50) according to the operating state of the access step. ), Brightness control step (S29 to S47) for controlling the brightness of the screen of the display device (40) based on the detection result of the detection device (48), and brightness control when the light emission amount of the light emitting device exceeds a threshold value A limiting step (S21, S75) for limiting the control operation of the step is executed.

  According to a ninth aspect of the present invention, there is provided an operation control method for a portable electronic device (10) comprising a light emitting device (50) for emitting light, a display device for displaying information, and a detection device (48) for detecting the intensity of external light. An operation control method, wherein (a) an access instruction is issued, the recording medium is accessed, (b) the light emission amount of the light emitting device is changed according to the operation state of step (a), and (c) external light The brightness of the screen of the display device is controlled based on the detection result of the detection device that detects the intensity of (d), and (d) the control operation in step (c) is limited when the light emission amount of the light emitting device exceeds the threshold value.

  In the ninth and tenth aspects, similarly to the first aspect, the operability can be improved by changing the light emission amount of the light emitting device in accordance with the access state of the recording medium. In addition, power saving can be achieved by controlling the brightness of the screen of the display device in accordance with the intensity of external light. Furthermore, by limiting the brightness control means when the light emission amount of the light emitting device exceeds the threshold value, the detection device can be arranged in the vicinity of the light emitting device, and the size of the device can be reduced.

  According to the present invention, the operability can be improved by changing the light emission amount of the light emitting device according to the access state of the recording medium. In addition, power saving can be achieved by controlling the brightness of the screen of the display device in accordance with the intensity of external light. Furthermore, by limiting the brightness control means when the light emission amount of the light emitting device exceeds the threshold value, the detection device can be arranged in the vicinity of the light emitting device, and the size of the device can be reduced.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

  Referring to FIG. 1, a digital camera 10 of this embodiment includes an optical lens 12. The optical image of the object scene is irradiated onto the imaging surface of the CCD imager 14 via the optical lens 12. On the imaging surface, a charge corresponding to the optical image of the object scene, that is, an image signal is generated by photoelectric conversion.

  The digital camera 10 of this embodiment has a playback mode and a shooting mode. When the dial key 52 is set to the marker indicating the playback mode, the digital camera 10 is set to the playback mode, while when the dial key 52 is set to the marker indicating the shooting mode, the digital camera 10 is set to the shooting mode. .

  When a shooting mode switching operation, that is, an operation for setting the dial key 52 to a marker corresponding to the shooting mode is performed, the CPU 24 starts a shooting task. At this time, through image processing is executed to display a real-time moving image of the object scene, that is, a through image on the LCD panel 40.

  Specifically, the CPU 24 commands the timing generator (TG) 22 to repeat pre-exposure and thinning-out reading. The TG 22 repeatedly executes pre-exposure of the CCD imager 14 and thinning-out reading of the image signal generated thereby. The TG 22 also generates a plurality of timing signals including a pixel clock, a horizontal synchronization signal Hsync, and a vertical synchronization signal Vsync. The driver 20 drives the CCD imager 14 in response to the timing signal. As a result, the vertical synchronization signal Vsync is generated every 1/30 seconds, and the image signal is output from the CCD imager 14 at a rate of 1 frame per 1/30 seconds.

  The CDS / AGC / AD circuit 16 performs a series of processes of correlated double sampling, automatic gain adjustment, and A / D conversion on the image signal output from the CCD imager 14. The signal processing circuit 18 subjects the raw image data output from the CDS / AGC / AD circuit 16 to a series of processes such as clamping, white balance adjustment, and YUV conversion, and requests for writing the low-resolution image data thus obtained. Is supplied to the memory control circuit 28.

  When writing is permitted by the memory control circuit 28, the signal processing circuit 18 supplies a predetermined amount of image data to the memory control circuit 28 through the bus 26. A predetermined amount of image data is written into the SDRAM 30 by the memory control circuit 28. Thus, the low-resolution image data is stored in the SDRAM 30 by a predetermined amount.

  The LCD driver 38 repeatedly gives a read request to the memory control circuit 28 in order to read the image data stored in the SDRAM 30 at a rate of 1 frame per 1/30 second. The memory control circuit 28 reads a predetermined amount of image data from the SDRAM 30, and the read image data is given to the LCD driver 38 via the bus 26. The LCD driver 38 converts the image data supplied from the memory control circuit 28 into a composite video signal conforming to the NTSC format, and supplies the converted composite video signal to the LCD panel 40. As a result, a through image of the object scene is displayed on the LCD panel 40 illuminated by the backlight 42.

  When a shooting operation, that is, an operation of pressing the shutter button 54 is performed, the system controller 44 outputs a shooting command to the CPU 24, and a shooting process is executed in accordance with the shooting command.

  Specifically, the CPU 24 instructs the TG 22 to execute main exposure and all-pixel reading, and instructs the driver 20 to drive the CCD imager 14. The TG 22 performs a main exposure on the CCD imager 14, and all charges generated by the main exposure are output to the CDS / AGC / AD circuit 16. Then, the same processing as described above is executed, and high-resolution image data is stored in the SDRAM 30.

  When the image data is stored in the SDRAM 30, the CPU 24 next instructs the JPEG codec 32 to perform JPEG compression. The JPEG codec 32 reads high-resolution image data stored in the SDRAM 30 through the memory control circuit 28, performs JPEG compression on the read image data, and writes the compressed image data into the SDRAM 30 through the memory control circuit 28. Thus, the compressed image data is stored in the SDRAM 30.

  Note that the transfer speed of the image data on the bus 26 is much faster than the processing speed of each of the signal processing circuit 18, the LCD driver 38, and the JPEG codec 32. For this reason, the image data does not collide on the bus 26, and the data transfer process does not fail.

  When the compressed image data is stored in the SDRAM 30, a recording process is executed. Specifically, the CPU 24 issues a recording command to the recording medium 36 to the I / F circuit 34, and the I / F circuit 34 issues a read request for compressed image data to the memory control circuit 28. The memory control circuit 28 reads the compressed image data stored in the SDRAM 30, and the image file including the read compressed image data is recorded on the recording medium 36 by the I / F circuit 34.

  The recording medium 36 is detachable, and can be accessed by the CPU 24 when it is mounted in a slot (not shown).

  When a reproduction mode switching operation, that is, an operation for setting the dial key 52 to a marker corresponding to the reproduction mode is performed, the CPU 24 activates a reproduction task.

  At this time, the desired image file recorded on the recording medium 36 is read by the I / F circuit 34, and the I / F circuit 34 writes the compressed image data included in this image file into the SDRAM 30 through the memory control circuit 28.

  When the compressed image data is stored in the SDRAM 30, a display process is executed. Specifically, the written compressed image data is read by the memory control circuit 28, and the memory control circuit 28 gives the read compressed image data to the JPEG codec 32. The JPEG codec 32 performs decompression processing on the compressed image data, and writes the decompressed image data thus obtained to the SDRAM 30 through the memory control circuit 28. The written decompressed image data is read by the LCD driver 38 via the memory control circuit 28. The LCD driver 38 converts the decompressed image data read from the memory control circuit 28 into a composite video signal conforming to the NTSC format, and is converted. The composite video signal is applied to the LCD panel 40. As a result, a desired image is displayed on the LCD panel 40.

  The brightness detection circuit 48 is formed by a phototransistor PT, a resistor R1, and a resistor R2. The phototransistor PT detects external light, and the current amount of the phototransistor PT changes in proportion to the intensity of external light. That is, if the external light is strong, the current supplied from the external power source VDD to the resistors R1 and R2 is amplified, and the voltage value of the resistor R1 and the voltage value of the resistor R2 are increased.

  When the power is turned on and the divided voltage value by the resistors R1 and R2 is applied to the A / D port 44p formed in the system controller 44, the system controller 44 changes the voltage value applied to the A / D port 44p. The detection result based on this is registered in the register 44r. The system controller 44 also captures the detection result registered in the register 44r and controls the backlight 42 based on the detection result.

  Specifically, if the voltage value applied to the A / D port 44p is smaller than 1.0 V, it is determined that the brightness of the LCD panel 40 should be suppressed because the external light is weak. The system controller 44 outputs a PWM signal for controlling the brightness of the backlight 42 to the lighting adjustment circuit 46, and the lighting adjustment circuit 46 adjusts the luminance of the backlight 42 according to the PWM signal. As a result, the amount of light emitted from the backlight 42 decreases, and the brightness of the LCD panel 40 falls below a predetermined value. Thereby, power consumption is reduced. A state in which the system controller 44 outputs a PWM signal to the output lighting adjustment circuit 46 is defined as a power saving mode.

  On the other hand, if the voltage value applied to the A / D port 44p is larger than 2.0V, it is determined that the LCD panel 40 should be bright because the external light is strong. The system controller 44 stops outputting the PWM signal. Thereby, the backlight 42 emits light with normal brightness, and the luminance of the LCD panel 40 shows a predetermined value. A state in which the output of the PWM signal by the system controller 44 is stopped is defined as a normal mode.

  As described above, when the external light is weak, that is, the surroundings are dark, it is easy to see even if the brightness of the LCD panel 40 is low. Therefore, the backlight 42 is set to the power saving mode, and when the external light is strong, that is, the surroundings are bright, the LCD In order to ensure the visibility of the panel 40, the backlight 42 is set to the normal mode. That is, the light emission amount of the backlight 42 is controlled according to the intensity of external light.

  The brightness of the LCD panel 40 in the power saving mode is 1/3 or less of the brightness of the LCD panel 40 in the normal mode. As a result, in the power saving mode, a 75% power saving effect can be obtained compared to the normal mode.

  During the access to the recording medium 36, the control of the backlight 42 is maintained, and a command to turn on the LED 50 that emits light (hereinafter, a lighting command) is issued from the CPU 24. At this time, the system controller 44 holds the control of the backlight 42 and lights the LED 50 according to the lighting command.

  On the other hand, when there is no access to the recording medium 36, a command for turning off the LED 50 (hereinafter, a turn-off command) is issued from the CPU 24, and adjustment of the backlight 42 is started. At this time, the system controller 44 turns off the LED 50 according to the turn-off command and starts adjusting the backlight 42. In addition, when the light emission amount of LED50 is zero, it considers that it is a light extinction state, and when the light emission amount of LED50 exceeds zero, it considers it as a lighting state.

  In other words, during access to the recording medium 36, the operability is improved by turning on the LED 50 while maintaining the control of the immediately preceding backlight 42. When there is no access to the recording medium 36, the power consumption can be reduced by adjusting the backlight 42 while maintaining the previous power saving effect. As a result, operability is given priority during access to the recording medium 42, and reduction of power consumption is given priority when there is no access to the recording medium 42.

  The digital camera 10 of this embodiment has a case 56. 2A and 2B, the shutter button 54 is provided on the upper surface of the case 56, the optical lens 12 is provided on the front surface of the case 56, and the back surface of the case 56 is provided. Are provided with an LCD panel 40 and dial keys 52. A window 58 for looking into the LED 50 and the phototransistor PT is formed in the vicinity of the dial key 52. This window 58 also serves as a marker for setting operation of the dial key 52. This improves operability.

  As shown in FIG. 3, a wall 62a and a wall 62b perpendicular to the substrate 60 are provided inside the window 58, and the LED 50 is provided in a region partitioned by the wall 62a and the wall 62b. A phototransistor PT is mounted in the vicinity of the LED 50, and a transparent cover 64 is provided so as to close the phototransistor PT and the LED 50. As a result, the phototransistor PT and the LED 50 are not exposed.

  The phototransistor PT captures external light obtained through the cover 64, and the LED 50 emits light through the cover 64. Here, the window 58 functions as an opening for outputting light emitted from the LED 50 to the outside during access to the recording medium 36, and functions as an opening for detecting outside light when there is no access to the recording medium 36. To do.

  Thus, the recording medium 36 is accessed by the I / F circuit 34 when an access instruction is issued. The CPU 24 changes the light emission amount of the LED 50 that emits light according to the operation state of the I / F circuit 34. The intensity of outside light is detected by the phototransistor PT. The brightness of the screen of the LCD panel 40 that displays information is controlled by the system controller 44 based on the detection result of the phototransistor PT. However, the control operation of the system controller 44 is limited by the CPU 24 when the light emission amount of the LED 50 exceeds zero.

  The operability can be improved by changing the light emission amount of the LED 50 in accordance with the access state of the recording medium 36. In addition, power saving can be achieved by controlling the brightness of the screen of the LCD panel 40 in accordance with the intensity of external light. Furthermore, by limiting the system controller 44 when the light emission amount of the LED 50 exceeds zero, the phototransistor PT can be disposed in the vicinity of the LED 50, and the device can be downsized.

  Specifically, the system controller 44 performs processing according to the flowcharts shown in FIGS. A program corresponding to this flowchart is stored in a flash memory (not shown).

  In step S1, the process waits until a startup operation is performed. When the power button is pressed, an activation signal is output to the CPU 24 in step S3. In step S5, it is determined whether or not a mode switching operation using the dial key 52 has been performed. When the mode switching operation is performed, the mode setting corresponding to the dial key 52 is performed in step S7. At this time, when the dial key 52 is set to the marker corresponding to the playback mode, the mode is switched to the playback mode, while when the dial key 52 is set to the marker corresponding to the shooting mode, the mode is switched to the shooting mode.

  In step S9, it is determined whether or not a shooting operation has been performed. When a shooting operation is performed, a shooting command is output to the CPU 24 in step S11. In step S13, it is determined whether or not a lighting command is given by the CPU 24. When the lighting command is given, the lighting command is given to the LED 50 in step S15. At this time, the LED 50 is lit.

  In step S17, it is determined whether or not a turn-off command is given by the CPU 24. When a turn-off command is given, a turn-off command is given to the LED 50 in step S19. At this time, the LED 50 is turned off.

  In step S21, it is determined whether or not the flag of the register 44r is “0”. If the flag is “0”, the process proceeds to step S29 to control the brightness of the LCD panel 40. If the flag is “1”, the process proceeds to step S23 to indicate that the recording medium 36 is being accessed. The flag will be described later in detail.

  In step S23, it is determined whether or not an end operation has been performed. When the end operation is performed, an end signal is output to the CPU 24 in step S25, and this process ends. On the other hand, if the end operation is not performed, other processing is executed in step S27. When this processing is finished, the process returns to step S5.

  According to FIG. 5, in order to ensure the brightness of the LCD panel 40 in step S29, the backlight 42 is set to the normal mode. At this time, the output of the PWM signal is stopped, and the backlight 42 emits light with normal brightness. As a result, the brightness of the LCD panel 40 shows a predetermined value.

  In step S31, a detection result based on external light is fetched from the register 44r.

  In step S33, it is determined whether or not the detection result is smaller than 1.0V. If the detection result is smaller than 1.0 V, the process proceeds to step S37 to set the power saving mode. If the detection result is 1.0 V or higher, it is determined in step S35 whether or not the detection result is greater than 2.0 V. If the detection result is larger than 2.0 V, the process proceeds to step S43 to set the normal mode. If the detection result is 1.0 V or more and 2.0 V or less, the process returns to step S23.

  It should be noted that the lighting of the backlight 42 has hysteresis. That is, the transition from the normal mode to the power saving mode is started only after the detection result becomes less than 1.0 V, and the transition from the power saving mode to the normal mode is started only after the detection result exceeds 2.0 V. As a result, the change in the brightness of the LCD panel 40 determined by the system controller 44 is appropriately started.

  In step S37, it is determined whether or not the current mode is the power saving mode. If the current mode is the power saving mode, the process returns to step S23. If the current mode is the normal mode, the process waits until 2 seconds elapse in step S39. After 2 seconds, the backlight 42 is set to the power saving mode in step S41. At this time, the same processing as described above is executed, and as a result, the brightness of the LCD panel 40 falls below a predetermined value. When this process ends, the process returns to step S23.

  In step S43, it is determined whether or not the current setting is the normal mode. If the current mode is the normal mode, the process returns to step S23. If the current setting is the power saving mode, the process waits until the result is 2 seconds in step S45. After 2 seconds, the backlight 36 is set to the normal mode in step S47. At this time, the same processing as described above is executed, and as a result, the luminance of the LCD panel 40 shows a predetermined value. When this process ends, the process returns to step S23.

  The CPU 24 is a multitasking CPU that operates according to a multitasking OS such as μITRON. Specifically, the CPU 24 performs processing according to the flowcharts shown in FIGS. 6 to 8, and the shooting mode and playback mode described above are the shooting task and playback mode, respectively. It is realized by a task, and the control of the backlight 44 is realized by a backlight control task. A program corresponding to this flowchart is stored in a flash memory (not shown).

  According to FIG. 6, through image display processing is performed in step S51. Specifically, a pre-exposure command is given to the TG 22 and a processing command is given to the signal processing circuit 18 and the LCD driver 38. As a result, a through image is displayed on the LCD panel 40. In step S53, the process waits until a shooting command is input from the system controller 44. When a shooting command is input, shooting processing is executed in step S55. Thus, the compressed image data is stored in the SDRAM 30.

  In step S57, a recording process is executed. Specifically, a recording instruction is given to the I / F circuit 34, and the I / F circuit 34 reads the compressed image data from the SDRAM 30 through the memory control circuit 28 in accordance with this instruction, and the read compressed image data is stored in the recording medium 36. Record. When the recording process ends, the process returns to step S51.

  According to FIG. 7, a file to be displayed on the LCD panel 40 is selected in step S61. In step S63, a reproduction process is executed. Specifically, a reproduction instruction for a desired file is given to the I / F circuit 34, and the I / F circuit 34 reads compressed image data from the corresponding file in accordance with this instruction, and reads the read image data into the memory control circuit 28. To the SDRAM 30. In step S65, display processing is executed. Specifically, processing instructions are given to the memory control circuit 28 and the LCD driver 38. As a result, the image data stored in the selected file is displayed on the LCD panel 40.

  According to FIG. 8, Flag is set to “0” in step S71, and in step S73, the process waits until the recording process or the reproduction process is started. When either the recording process or the reproduction process is started, it is determined that the recording medium 36 is being accessed, and the flag is set to “1” in step S75. In step S77, a lighting command is issued to the system controller 44. In step 79, the process waits until the process started in step S73 is completed. When the process ends, a turn-off command is issued to the system controller 44 in step S81, and the process returns to step S71.

  That is, when Flag is “0”, the brightness control of the backlight 42 by the controller 44 is started, and the LED 50 is turned off. When Flag is “1”, the brightness control of the backlight 42 is stopped and the LED 50 is turned on.

  In this embodiment, the case has been described as being made of metal as shown in FIG. 3, but the present invention is not limited to this, and a resin case can also be adopted.

  In this embodiment, the phototransistor PT is used as a detection device for detecting the intensity of external light. However, the present invention is not limited to this as long as it is an integrated circuit (IC) that detects the amount of light.

  Further, in this embodiment, the light emission state by the backlight 42 has been described using the power saving mode and the normal mode. However, the present invention is not limited to this, and the backlight 42 is controlled by controlling the PWM signal output from the system controller 44. It is also possible to set the light emission state to three or more states.

It is a block diagram which shows the structure of one Example of this invention. (A) is an illustrative view showing an example of a front surface of a digital camera 10 applied to the embodiment in FIG. 1, and (B) is an illustrative view showing an example of a rear surface of the same digital camera 10. FIG. 2B is a cross-sectional view showing an example of the configuration of the window 58 applied to the embodiment. It is a flowchart which shows a part of operation | movement of the system controller 44 applied to the FIG. 1 Example. It is a flowchart which shows a part of other operation | movement of the system controller 44 applied to the FIG. 1 Example. It is a flowchart which shows a part of operation | movement of CPU24 applied to the FIG. 1 Example. It is a flowchart which shows a part of other operation | movement of CPU24 applied to the FIG. 1 Example. It is a flowchart which shows a part of other operation | movement of CPU24 applied to the FIG. 1 Example.

Explanation of symbols

10 ... Digital camera 24 ... CPU
34 ... I / F circuit 36 ... Recording medium 40 ... LCD panel 42 ... Backlight 44 ... System controller 46 ... Lighting adjustment PT ... Phototransistor 50 ... LED

Claims (9)

In a portable electronic device including a light emitting device that emits light, a display device that displays information, and a detection device that detects the intensity of external light,
Access means for accessing the recording medium when an access instruction is issued;
Changing means for changing the light emission amount of the light emitting device according to the operating state of the access means;
Brightness control means for controlling the brightness of the screen of the display device based on the detection result of the detection device; and limiting means for restricting the control operation of the brightness control means when the light emission amount of the light emitting device exceeds a threshold value. A portable electronic device, further comprising:   The portable electronic device according to claim 1, wherein the changing unit turns off the light emitting device in which an access operation of the access unit is suspended, and the threshold value is zero. The access instruction includes a recording instruction and a reproduction instruction,
The portable electronic device according to claim 1, wherein the access unit includes a recording processing unit that executes a recording process in response to the recording instruction, and a reproduction processing unit that executes a reproducing process in response to the reproduction instruction. . A case in which an opening for looking into the light emitting device and the detection device is formed; and a dial key attached to the case;
The portable electronic device according to claim 1, wherein the opening also serves as a marker for setting operation of the dial key.   The portable electronic device according to claim 4, further comprising a transparent cover that closes the opening.   The brightness control means includes a determination means for determining the change of the brightness, a change means for changing the brightness according to the determination of the determination means, and a predetermined time from the determination of the determination means to the change of the change means. The portable electronic device according to any one of claims 1 to 5, further comprising standby means for waiting.   The portable electronic device according to claim 6, wherein the determination unit has a hysteresis characteristic. In a processor of a portable electronic device including a light emitting device that emits light, a display device that displays information, and a detection device that detects the intensity of external light,
An access step for accessing the recording medium when an access instruction is issued;
A changing step of changing a light emission amount of the light emitting device according to an operation state of the access step;
A brightness control step for controlling the brightness of the screen of the display device based on the detection result of the detection device for detecting the intensity of outside light, and a control operation of the brightness control step when the light emission amount of the light emitting device exceeds a threshold value An operation control program for executing a restriction step for restricting. A method for controlling the operation of a portable electronic device comprising a light emitting device that emits light, a display device that displays information, and a detection device that detects external light,
(a) When the access instruction is issued, access the recording medium,
(b) Change the light emission amount of the light emitting device according to the operating state of the step (a),
(c) controlling the brightness of the screen of the display device based on the detection result of the detection device for detecting the intensity of external light, and
(d) An operation control method for restricting the control operation in the step (c) when the light emission amount of the light emitting device exceeds a threshold value.

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