JPH09281618A - Fault discovering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fault discovering device whose current consumption is low by temporally controlling a fault detection instruction means. SOLUTION: When a specified impact is given from the outside, an impact detection means 1 detects that the impact is given and outputs impact detection information. An impact detection instruction means 2 instructs that the detection means 1 is kept in an impact detection feasible state. It is provided with a release switch detection means 5 detecting the state of a release switch for instructing a camera to perform photographing, and a situation that a user holds the camera or that the user sets the camera to photograph, a human body detection means 6 and a grip switch detection means 7. Then, it is provided with a timer 4 controlling the time, and an arithmetic operation means 3 inputs information from the detection means 5, 6 and 7, controls a sequence and restricts the timing of detecting the impact by using the timer 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fault finding device, and more particularly to a fault finding device for grasping a fault condition of equipment.

[0002]

2. Description of the Related Art Conventionally, in the case of a device such as a camera that is carried and used by a user, the user may drop or hit the device on the way of carrying it to break it. In addition, there is a possibility that the environment of use may be harsh, or the device may be left in an environment of high temperature or low temperature without being noticed by the user while moving, and the device may be destroyed.

As described above, although portable devices such as cameras are always exposed to the risk of failure due to external factors, even if the user notices a failure of the device, what kind of failure this malfunction may cause. It is difficult to identify what happened under the circumstances. If this failure can be identified, for example, in the case of a camera failure, it is possible to take measures such as preparing an alternative camera and taking another picture. It is difficult to grasp.

Further, if the picture is not well taken after the end of the photographing, is this the cause of the camera failure?
Alternatively, it is difficult to determine whether the operation is wrong, which is inconvenient.

In view of such circumstances, the present applicant has filed Japanese Patent Application No. 7-
No. 291343 proposes a technical means for notifying the user that a shock has been applied to the camera.

As a technical means for detecting the holding state of the camera, Japanese Patent Laid-Open No. 64-42639 proposes an automatic focusing system. This technical means detects the infrared rays generated by humans and the fact that the viewfinder is in contact with the eyes. In addition, a switch is provided on the grip of the camera to detect that it is holding the camera.

[0007]

[Patent Document 1] Japanese Patent Application No. 7-291
The failure detection and storage device proposed in No. 343 is a useful technical means that enables the user to be notified that a shock has been applied to the camera. However, a sensor for detecting the shock always keeps a constant voltage. Since it is configured, there is a problem that the current consumption increases.

Further, the technical means disclosed in the above Japanese Patent Laid-Open No. 64-42639 detects that a camera is held, but after the detection, it is characterized by performing automatic focus adjustment. Moreover, the failure detection and the detection timing are not disclosed.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a failure detection device which consumes less current.

[0010]

In order to achieve the above object, the first failure detection apparatus of the present invention detects the occurrence of a failure factor when a failure factor that may cause a device failure occurs. Failure factor detection means, failure detection instruction means for giving a detection instruction to the failure factor detection means when the device is in a situation where the occurrence of the failure factor may occur, and time control for time control of the failure detection instruction means. And means.

[0011] In order to achieve the above object, a second aspect of the present invention is provided.
The failure detection device of, the impact detection means for detecting the impact applied to the device, the use preparation state detection means for detecting whether or not the device is in the use preparation state, the device of the use preparation state detection means And a timer means for measuring the time from the time of detecting the ready state for use, and controlling the detection operation or stop of the impact detecting means based on the information from the ready for use state detecting means, and when the predetermined time is measured by the timer means. Impact detection control means for releasing the detection operation of the impact detection means.

In order to achieve the above object, a third aspect of the present invention is provided.
The failure finding device of is the above-mentioned second failure finding device,
The use preparation state detecting means has a holding detecting means for detecting a state in which the user holds the device.

In the first failure finding device, the failure factor detecting means detects the occurrence of the failure factor when the failure factor which may cause the device failure occurs. Further, the failure detection instruction means gives a detection instruction to the failure factor detection means when the device is in a situation where the occurrence of the failure factor may occur. Further, the time control means controls the time of the failure detection instruction means.

The second failure detection device detects the impact applied to the equipment by the impact detection means. Further, the use preparation state detecting means detects whether or not the device is in the use preparation state. Further, the timer means measures the time from the time when the ready-to-use detecting means detects the ready-to-use status of the equipment, and the shock detection control means detects the shock detecting means based on the information from the ready-to-use detecting means. The operation or stop is controlled, and the detection operation of the impact detection means is canceled when a predetermined time is measured by the timer means.

The third failure finding device detects the state in which the user holds the device by the holding detecting means included in the use preparation state detecting means in the second failure finding device.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the basic configuration of a failure detection device according to the first embodiment of the present invention.

As shown in the figure, the failure finding device of the first embodiment detects that a predetermined shock is applied from the outside to a device equipped with the failure finding device. Then, the impact detection means 1 for outputting the impact detection information
A shock detection instruction means 2 for instructing the shock detection means 1 to maintain a shock detectable state, a release switch detection means 5 for detecting the state of a release switch for instructing the camera to perform photographing, and a user Human body detecting means 6 for detecting holding the camera and grip switch detecting means 7 for detecting that the user holds the camera.
And a timer 4 for controlling the time, and inputs information from the release switch detecting means 5, the human body detecting means 6, and the grip switch detecting means 7, controls the sequence, and controls the timer 4 And a calculation control means (CPU) 3 for limiting the timing of detecting an impact, and the main part is configured.

As described above, this embodiment is an example in which the failure detection device of the present invention is adopted in a camera.

FIG. 2 is an electric circuit block diagram showing an electric circuit configuration of a camera to which the failure detection device of the first embodiment is applied.

As shown in the figure, the camera equipped with the failure detection device has a power supply battery 8 for supplying a power supply voltage Vcc1.
And the voltage Vcc1 from the power supply battery 8 is changed to the voltage Vcc2.
And a DC / DC converter 9 for boosting the voltage, and the power supply voltage is supplied to each circuit described later. The circuit configuration of the camera will be described below along the flow of signals.

The camera includes a microcomputer (CPU) 3 that controls the entire camera, and a release switch 18 and a grip switch 17 are connected to the CPU 3. The release switch 18 is a switch that is turned on when the user performs shooting. Furthermore, C
The LCD 11 is connected to the PU 3 and the LC
A display changeover switch 10 for changing over the display of D11 is connected.

The LCD 11 normally displays the date and time information from the date module 12 having a clock function, but when the display changeover switch 10 is turned on, the date and time when the shock applied to the camera occurs is displayed. It is like this. The details will be described later.

An electrically rewritable memory, an EEPROM 13, is connected to the CPU 3, and the EEPROM 13 is controlled by the CPU 3 to store the date and time of the impact and the location of the impact. It is supposed to do. In addition, the CPU 3 has an AMP
A commercial IC (amplifier IC) 14 is connected. This AM
The P IC 14 amplifies a signal from an impact sensor (shock sensor) 15 that detects an impact and transmits it to the CPU 3.

Further, the CPU 3 has a human body detection circuit 1
6 is connected, and the CPU 3 controls the human body detection circuit 16 and inputs information from the human body detection circuit 16. The human body detection circuit 16 will be described below.

FIG. 3 is a block circuit diagram showing the configuration of the human body detection circuit 16 in the failure detection device of the first embodiment.

In FIG. 3, the human body detection circuit 16 includes a first human body detection section 41 using an infrared photoreflector,
It has a second human body detection unit 42 using a pyroelectric infrared sensor, and the outputs of both of these detection units are input to the CPU 3 as human body detection signals (human body discrimination signal A, human body discrimination signal B). ing.

The first human body detecting section 41 is composed of a photoreflector having an infrared projecting system and an infrared receiving system. Of these, the infrared projecting system includes an infrared LED driving section 43 and an infrared LED driving section 43. Infrared light emitting diode 47 and infrared light are emitted from the infrared light emitting diode 47 by the output of the infrared LED drive section 43. On the other hand, the infrared light receiving system is composed of a photodiode 48 and a waveform amplification and shaping section 45,
The infrared light received by the photodiode 48 is photoelectrically converted, amplified and shaped by the waveform amplification and shaping section 45, and then output to the CPU 3.

That is, the infrared light projected from the infrared projection system is reflected by the user (human body) 40 when the user holds the camera and is incident on the infrared receiving system. Has become. Then, the reflected infrared light is received by the infrared light receiving system and output to the CPU 3 as a human body discrimination signal A.

As described above, the first human body detecting section 41 constituted by using the infrared photo reflector supplies the human body discrimination signal A to the CPU 3 in response to the operation when the photographer looks into the finder. It has become.

On the other hand, the second human body detecting section 42 includes a pyroelectric infrared sensor (hereinafter abbreviated as pyroelectric detecting element) 54 which is a kind of light receiving element, and the pyroelectric detecting element 54 has The output is connected to the waveform amplifier 51 via the FET 53. Further, the output of the waveform amplifier 51 is the CPU
Connected to 3.

First, infrared rays emitted from the human body 40 approaching the camera are incident on the surface of the pyroelectric detection element 54.
As a result, the incident infrared rays are absorbed and converted into heat. This heat changes the element temperature, and an electric charge is instantaneously generated based on the pyroelectric effect. The output signal of the pyroelectric detection element 54 is input to the source terminal of the FET 53, converted into a predetermined voltage, and the output is extracted and input to the waveform amplification section 51. After being amplified by the waveform amplifying section 51, it is inputted to the CPU 3 as a human body discrimination signal B.

As described above, the second human body detecting section 42 constructed by using the pyroelectric infrared sensor outputs the human body discrimination signal B to the CPU when the photographer approaches the camera.
3 is supplied.

Next, the impact sensor 15 and the AMP IC 14 will be described with reference to FIG.

FIG. 4 shows the impact sensor 15 and the AMP IC 14 in the failure detecting apparatus according to the first embodiment.
3 is an electric circuit block diagram showing the configuration of FIG.

The impact sensor 15 is a minute component having two terminals, and is constructed by bonding ceramic substrates to the upper and lower sides of the bimorph element. The impact sensor 15 directly detects the impact applied to the camera body, and the detection signal is AM.
The signal is amplified by the P IC 14 and transmitted to the CPU 3.

As shown in FIG. 4, the AMP IC 14 receives the output power supply Vcc2 of the DC / DC converter 9 and generates a reference power supply for the impact sensor 15, and a reference power supply circuit 31. An output adjusting amplifier 32 which is connected to one end of the impact sensor 15 and adjusts the output level of the impact sensor 15, and a buffer amplifier 33 which is connected to the other end of the impact sensor 15 and receives an output from the impact sensor 15. An amplifier 34 for receiving the output of the buffer amplifier 33 and amplifying it,
A shock detection circuit 35 connected to the subsequent stage, which detects the presence or absence of a shock based on a signal from the amplification amplifier 34, and sends the detection result to the CPU 3, and a power save signal from the CPU 3 to receive the power save signal from the AMP IC 14 And a power save function circuit 36 that sets the power saving mode to a power saving mode.

The AMP IC 1 having the above structure
4 is a stable power supply Vcc2 of the DC / DC converter 9
The reference power supply circuit 31 generates a reference voltage to be applied to the shock sensor 15, and outputs the reference voltage to the shock sensor 15 via the output adjustment amplifier 32.

The shock sensor 15 outputs a normal output, that is, the above-mentioned reference voltage when a predetermined shock is not applied to the camera, but outputs an "L" level signal when the shock to the camera is detected. This impact sensor 1
The output of 5 is amplified through a buffer amplifier 33 and an amplifier 34
Is amplified and input to the impact detection circuit 35. And
The detection signal in the impact detection circuit 35 is transmitted to the CPU 3.

The AMP IC 14 has a PS terminal for inputting a power save signal from the CPU 3, and a power save function circuit 36 is connected to the PS terminal.

FIG. 5 is a diagram showing a case where an impact applied to a camera body to which the failure detection device of the first embodiment is applied is detected.
It is the diagram which showed an example of the output signal waveform of said IC14 for AMP.

As described above, the signal output from the AMP IC 14 outputs the voltage level applied to the terminal in the normal state of its output terminal. When a shock is applied at such a timing, the output becomes an "L" level signal as shown in the figure corresponding to the shock. When the CPU 3 detects such an "L" level signal from the AMP IC 14, the CPU 3 stores the location of the detected sensor and the detection date and time in the EEPROM 13.

The impact sensor as described above normally outputs the voltage level as described above. However, if the impact sensor 15 is constantly driven, a constant current will be consumed, so that the battery will be discharged. It leads to short-term exhaustion.

The failure detection device of the present embodiment has been made in consideration of such circumstances, and is configured so that the timing for detecting the shock is limited so as to prevent the useless current from flowing in order to prevent the short-term consumption of the battery. ing.

In the failure detection apparatus of the first embodiment, the timing to be limited is when the user is gripping the grip of the camera, when the release switch is turned on, or when the photographer views the viewfinder. It is assumed that the photographer approaches the camera when looking into the camera, and these are when it is detected that the user holds the camera.

Next, the operation of the failure detection apparatus of the first embodiment for detecting the impact as described above will be briefly described with reference to the flowchart shown in FIG.

First, in step S10, the state of the grip switch 17 of the camera is detected. As shown in FIG. 7, the grip switch 17 is a hold switch arranged at a position where the photographer is supposed to hold the camera at the time of photographing, and is arranged on a grip 37a held by the photographer's right hand 40A. . The grip switch 17 is a switch including a pressure sensitive rubber sensor.

If the hold switch (grip switch 17) is on, the process proceeds to step S14.
If it is off, the state of the release switch is detected in step S11. If the release switch is on, the process proceeds to step S14. If it is off, the process proceeds to step S12 to detect the human body by the human body detection circuit 16. To do. Human detection here means detecting the eyes of the photographer looking into the viewfinder or detecting infrared rays emitted from the photographer, and in any case, it means that the photographer is holding the camera. To recognize.

When the human body is detected in step S12, the process proceeds to step S14. When the human body is not detected, the shock detectable off state is set in step S13 and step S1.
The waiting state is 0 for grip switch detection, step S11 for release switch detection, and step S12 for human body detection.

When the grip switch 17 is turned on (step S10), the release switch is turned on (step S11), or when the human body detection circuit 16 detects that the photographer is holding the camera (step S1).
2) Start the impact detectable limit timer (step S14). Next, in step S15, the shock detectable ON state is set.

Now, the shock detectable OFF state (shock detection OFF) and the shock detectable state (shock detection ON) will be described with reference to FIG.

The signal at the time of impact detection has been described above (see FIGS. 4 and 5). During the signal detection, the CPU 3 sends the power save function circuit 36 via the PS terminal of the amplifier IC 14 to the power save function circuit 36. Power save signal of "L" level signal is input. As a result, the failure detection device of the present embodiment is in the impact detectable state (ON).

When an "H" level power save signal is input to the power save function 36, the power save function circuit 36 is turned on and the AMP IC 14 enters the power save mode. As a result, the failure detection device of the present embodiment is in the impact detectable off state in the low power consumption state.

That is, returning to FIG. 6, step S13
The shock detection off of is the state when the "H" level signal is transmitted from the CPU 3 to the PS terminal (power save function circuit 36), and the shock detection on of step S15 is the same "L" level. This is the state when the signal is transmitted.

Next, in step S15, when the shock detection is possible, the shock detection waiting state is set in step S16. Although this flowchart only describes the flow of shock detection, the shock wait state includes processing as a camera, such as exposure, film winding after exposure, and zoom drive.

The state of waiting for an impact in step S16 is continued until the limit timer ends in step S17, and after the timer ends, the process returns to step S10.

When an impact is detected in step S16, the process proceeds to steps S18 and S19, where information on the location of the impact, for example, the tip of the lens frame and the date module 12 is received.
The date and time information at that time is stored in the EEPROM 13. Further, at this time, if the display changeover switch 10 is operated and displayed on the LCD 11, it is possible to instantly confirm that a shock has occurred to the camera. The timing for displaying this can be displayed at any time, for example, immediately before step S10 and after the loop returns.

As described above, according to the failure detection apparatus of the first embodiment, the camera can be used when the user holds the camera, holds it, holds it, and so on. Since the shock detection system operates only in a situation where it is easy to drop and give a shock and does not operate in other situations, it does not consume unnecessary current,
It is possible to realize a fault detection device with low current consumption.

Next, a second embodiment of the present invention will be described.

The fault finding device of the second embodiment has the same basic configuration as that of the first embodiment,
The human body detection circuit part is different. Therefore, only the differences will be described here, and detailed description of other configurations and actions will be omitted.

FIG. 8 is a circuit diagram showing an extracted human body detection circuit portion in the failure detection device of the second embodiment.

In the present embodiment, although not shown, the input side line of the inverter 60 is arranged on the exterior of the camera, which the human hand touches in the holding posture. As shown in FIG. 8, the input side of the inverter 60 is pulled up to the power supply system line by a resistor 61 having a relatively high resistance,
When the line on the input side is touched with a hand, the hum generated from a person causes the signal level to fluctuate (see FIG. 9A). Further, when this swinging signal is input to the inverter 60, it is shaped and output to the CPU 3 (see FIG. 9B).

The output of the inverter 60 is set to CP.
By detecting at U3, it is possible to detect that the user is holding the camera.

FIG. 10 is a flowchart showing the steps from hum detection to impact detection in the failure detection device of the second embodiment.

First, in step S101, it is detected whether or not the hum has occurred. The detection method is hum detection when the above-described inverter 60 alternately outputs the "H" level signal and the "L" level signal, and no detection is performed when the output signal state is constant. This judgment is executed by the CPU 3. If the hum is not detected, it is considered that the user is not in the holding posture. In step S102, the shock detection of the shock detection circuit (the shock sensor 15 and the AMP IC 14 (see FIG. 2)) is turned off. After the shock detectable limit timer is started in S103, the shock detecting circuit is set to the shock detectable state in step S104.

Next, in step S105, it is determined whether or not the impact detection circuit detects an impact. Even if no impact is detected, the impact detection circuit waits for detection until the limit timer in step S106 ends. It is in a state. After the limit timer ends, the process returns to step S101 to continue the hum detection determination, and during the hum detection, the impact detection circuit is in the detection waiting state.

On the other hand, if an impact is detected in step S105, the process proceeds to step S107, the date and time of the impact instant is read from the date module 12 (see FIG. 2), and L
It is displayed on the CD 11 or stored in the EEPROM 13 (step S108).

As described above, according to the failure detecting apparatus of the second embodiment, the human body detecting means for detecting that the user is holding the camera can be obtained with the same effect as that of the first embodiment. It becomes possible to configure with a simpler and cheaper circuit.

Next, a third embodiment of the present invention will be described.

The failure detection device of the third embodiment is a combination of the first embodiment and the second embodiment described above in terms of the basic configuration, and is different only in the operation.
Therefore, only the differences will be described here, and detailed description of other configurations and actions will be omitted.

FIG. 11 is a flow chart showing the shock detecting operation in the failure detecting apparatus of the third embodiment.

First, in step S111, it is detected whether or not a person is detected. Here, the detection of a person includes detection of a grip switch, detection of a release switch, and detection of a human body as described above in the description of the first embodiment.
It includes ham detection as described above in the description of the second embodiment.

If none of the detection means is detected in step S111, it is determined that the camera is in a standing state, and the impact detection circuit is set to the power save mode in step S112. This power save mode ends when a person is detected in step S111.

On the other hand, if a person is detected by any of the detecting means in step S111, the process proceeds to step S113 to start the impact detection standby limit timer.

Next, in step S114, the power saving function of the impact detection circuit is stopped to enter the impact detection standby state, and impact detection is performed in step S115. If impact detection is not confirmed in step S115, the standby state is maintained until the impact detection standby limit timer ends, and when the timer expires, step S119 is performed.
Release the shock detection standby of the shock detection circuit, and enter the power save mode.

If a shock is confirmed in step S115, the process proceeds to step S116, the date and time information is read from the date module 12, and the information is read in step S116.
After storing in the EEPROM 13 at 117,
The CPU 3 is stopped and the operation of the camera is stopped.

According to the failure detection apparatus of the third embodiment, when the camera receives a shock as described above, the camera that has received the shock is immediately stopped, so that the camera does not operate even if the user tries to operate it. Therefore, you will never take a picture that may fail. In addition, the user notices the failure due to the camera not operating, prompts early detection of the failure, and can promptly respond to the repair.

The first, second and third embodiments are as follows.
The shock detection system works only in situations where the camera is likely to be dropped and shocked, such as when holding the camera, holding it, or holding it in your hand.It does not work in other situations. System. As a result, it is possible to realize a fault detection camera with low current consumption that can avoid unnecessary current flow.

[Additional Remarks] According to the embodiments of the present invention described in detail above, the following configurations can be obtained. That is, (1) failure factor detection means for detecting the occurrence of a failure factor when a failure factor that can cause a device failure occurs,
When the device is in a situation where the occurrence of the failure factor may occur, the failure factor detection means is provided with a failure detection instructing means, and a time control means for time-controlling the failure detection instructing means. Failure detection device characterized by.

(2) In the failure detection device described in (1) above, there is further provided holding detection means for detecting that the user holds the device, and the situation in which the failure factor can be found is as follows. It is characterized in that the holding detection means detects the holding of the device.

(3) In the failure detection device described in (2) above, the holding detection means has a switch for detecting whether or not the user is in a use preparation state.

(4) A shock detecting means for detecting a shock applied to the camera, a photographing preparation state detecting means for detecting whether or not the camera is in the photographing preparation state, and information from the photographing preparation state detecting means. On the basis of the above, a camera characterized by comprising: shock detection instruction means for generating an instruction signal to bring the shock detection means into a detectable state; and time control means for controlling an instruction time of the shock detection instruction means. Failure detection device.

(5) In the failure detection device described in (4) above, the photographing preparation state detecting means has a switch for detecting whether the photographer is in a photographing preparation posture.

(6) In the fault detecting apparatus described in (4) above, the photographing preparation state detecting means has a switch means for detecting whether or not the photographer holds the camera.

(7) In the failure detecting device described in (4) above, the photographing preparation detecting means detects whether or not the photographer is looking through the viewfinder of the camera.

(8) In the failure detection apparatus described in (4) above, the photographing preparation state detecting means detects the state of the release switch for instructing the photographing of the camera by the photographer.

(9) Impact detection means for detecting the impact applied to the camera, operation state detection means for detecting the operation state of the camera, and time counting from the time when the operation state detection means detects the operation state of the camera. A shock detecting means for controlling the detecting operation or stopping of the shock detecting means based on the information from the operation state detecting means and the timer detecting means for canceling the detecting operation of the shock detecting means when a predetermined time is counted by the timer means. A camera failure detection device, comprising: a control unit.

(10) Impact detecting means for detecting an impact applied to the camera, photographing preparation state detecting means for detecting whether or not the camera is in the photographing preparation state, and photographing by the camera of the photographing preparation state detecting means. The timer means for measuring the time from the detection of the preparation state and the detection operation or stop of the impact detection means based on the information from the photographing preparation state detection means, and the impact when the predetermined time is measured by the timer means It is characterized by further comprising shock detection control means for canceling the detection operation of the detection means, shock storage means for storing shock information by the shock detection means, and display means for displaying the shock information. Camera failure detection device.

[0089]

As described above, according to the present invention, it is possible to provide a fault locating device with low current consumption.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration of a failure detection device according to a first exemplary embodiment of the present invention.

FIG. 2 is an electric circuit block diagram showing an electric circuit configuration of a camera to which the failure detection device of the first embodiment is applied.

FIG. 3 is a block circuit diagram showing a configuration of a human body detection circuit in the failure detection device of the first embodiment.

FIG. 4 is an electric circuit block diagram showing a configuration of an impact sensor and an AMP IC in the failure detection device of the first embodiment.

FIG. 5 is an AMP I when the impact applied to the camera body to which the failure detection device of the first embodiment is applied is detected.
It is the diagram which showed an example of the output signal waveform of C.

FIG. 6 is a flowchart showing the operation of the failure detection device of the first exemplary embodiment.

FIG. 7 is a front view showing an arrangement example of a grip switch in the failure detection device of the first embodiment.

FIG. 8 is a circuit diagram showing a human body detection circuit portion in the failure detection device of the second exemplary embodiment of the present invention.

FIG. 9 is a diagram illustrating the failure detection device according to the second embodiment,
It is a diagram showing a hum signal (a) generated when a line on the input side is touched with a hand and a shaping signal (b) of the signal.

FIG. 10 is a flowchart showing the operation of the failure detection device of the second exemplary embodiment.

FIG. 11 is a flowchart showing an impact detection operation in the failure detection device of the third exemplary embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Impact detection means 2 ... Impact detection instruction means 3 ... CPU 4 ... Timer 5 ... Release switch detection means 6 ... Human body detection means 7 ... Grip switch detection means 14 ... AMP IC 15 ... Impact sensor 16 ... Human body detection circuit 17 ... Grip switch 36 ... Power save function circuit 41 ... First human body detection unit 42 ... Second human body detection unit

Claims (3)

[Claims] 1. A failure factor detecting means for detecting the occurrence of a failure factor when a failure factor that can cause a failure of the device occurs, and the device is in a situation where the occurrence of the failure factor can occur. A failure detection device comprising: a failure detection instruction means for giving a detection instruction to the failure factor detection means; and a time control means for time-controlling the failure detection instruction means. 2. A shock detecting means for detecting a shock applied to a device, a use preparation state detecting means for detecting whether or not the device is in a use preparation state, and a device for detecting the use preparation state of the device. While controlling the detection operation or stop of the impact detection means based on the information from the timer means for measuring the time from the detection of the use preparation state and the use preparation state detection means,
A failure detection device comprising: shock detection control means for canceling the detection operation of the shock detection means when a predetermined time is measured by the timer means. 3. The failure detection device according to claim 2, wherein the use preparation state detection means has a holding detection means for detecting a state in which the user holds the device.