JP2009003406A - Endoscopic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an endoscopic device capable of reducing influence on a light emitting device by an abnormal current. <P>SOLUTION: An LED driving power source 102 supplies driving power to an LED 501. An abnormal current detection circuit 104 detects an abnormal current flowing in the LED 501. When an abnormal current detection signal 100b shows the detection of the abnormal current, a control part 102a in the LED driving power source 102 stops the supply of the driving power by the LED driving power source 102. Alternatively, a control part 103a in a current limit circuit 103 switches a resistance value to determine a current value limited by the current limit circuit 103 and controls so that the current value may be small. Alternatively, a system control part 101 controls a display part 107 to display an error message or a warning message. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an endoscope apparatus including a light emitting element.

  2. Description of the Related Art Endoscope apparatuses for performing maintenance of pipes in plants and buildings, inspection of jet engines, inspection of boilers, and the like are widely used. In addition, an endoscope apparatus is also used in which an optical adapter incorporating a light emitting element such as an LED or LD or a lens can be attached to and detached from the distal end of an elongated insertion portion (see, for example, Patent Document 1).

  When attaching or detaching the optical adapter, there is a possibility that a single failure occurs in which the electrode of the light emitting element built in the optical adapter comes into contact with the metal exterior part at the distal end of the insertion part. In a single failure, a pattern in which only the power input of the light emitting element is connected to the ground (GND), a pattern in which only the power output of the light emitting element is connected to the ground (GND), and the power input and power output of the light emitting element It is conceivable that one of three phenomena of a pattern in which both are connected to the ground (GND) occurs.

In the pattern in which only the power input is connected to the ground (GND) and the pattern in which both the power input and the power output are connected to the ground (GND), no current flows through the light emitting element, but only the power output is In the pattern connected to the ground (GND), an abnormal current different from that during normal operation flows through the current path of power source → light emitting element → ground (GND), and the light emitting element is damaged. Therefore, the endoscope apparatus described in Patent Document 1 includes a current limiting circuit that limits a current value supplied to the light emitting element.
JP 2005-66356 A

  By providing the current limiting circuit, it is possible to limit the current value of the abnormal current and prevent the light emitting element from being damaged. However, the current value limited by the normal current limit circuit is higher than the current value during normal operation, so even if the light emitting element does not break, the user will not notice a single failure and operate normally. The endoscope apparatus is continuously used in a state in which a current higher than that is flowing in the light emitting element, which has an effect of shortening the life of the light emitting element.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide an endoscope apparatus that can reduce the influence of an abnormal current on a light emitting element.

  The present invention has been made to solve the above problems, and includes a power source that supplies driving power to a light emitting element, an abnormal current detecting unit that detects an abnormal current flowing in the light emitting element, and the abnormal current detecting unit. An endoscope apparatus comprising: function execution means for executing a predetermined function when the abnormal current is detected.

  In the endoscope apparatus in which the optical adapter incorporating the optical system and the light emitting element can be attached to and detached from the distal end of the insertion portion, the determining means for determining at least one of the attachment state and type of the optical adapter; And a determination power supply for supplying electric power necessary for the determination by the determination means.

  In the endoscope apparatus of the present invention, when driving the light emitting element, driving power from the power source is supplied to the light emitting element via the abnormal current detecting means, and the determining means performs the determination. When performing, the electric power from the said determination power supply is supplied to the said light emitting element and the said determination means, without passing through the said abnormal current detection means.

  The endoscope apparatus according to the present invention further includes a current limiting unit that limits a current value of the abnormal current.

  In the endoscope apparatus according to the present invention, the predetermined function executed by the function execution unit controls a supply amount of driving power from the power source when the abnormal current is detected by the abnormal current detection unit. It is characterized by that.

  In the endoscope apparatus of the present invention, the predetermined function executed by the function executing unit is a current value limited by the current limiting unit when the abnormal current is detected by the abnormal current detecting unit. It is characterized by controlling.

  In the endoscope apparatus according to the present invention, the predetermined function executed by the function executing unit is to notify a user when the abnormal current is detected by the abnormal current detecting unit. Features.

  In the endoscope apparatus according to the present invention, the abnormal current detecting means detects the abnormal current based on a result of comparing a voltage of a line to which the light emitting element is connected with a reference voltage.

  The endoscope apparatus according to the present invention is an endoscope apparatus in which an optical adapter incorporating an optical system and the light emitting element can be attached to and detached from a distal end of an insertion portion, and the reference voltage is set to a voltage corresponding to the type of the optical adapter. Is set.

  According to the present invention, when an abnormal current is detected, it is possible to execute a predetermined function that leads to a decrease in the abnormal current. Therefore, it is possible to reduce the influence of the abnormal current on the light emitting element. Is obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
First, a first embodiment of the present invention will be described. FIG. 1 shows the appearance of the endoscope apparatus according to the present embodiment. The endoscope apparatus includes a main unit 1 and a scope unit 2 connected to the main unit 1. The main unit 1 is a unit that controls the entire endoscope apparatus, and includes a power supply, an image processing circuit, and the like in addition to the system control unit. The scope unit 2 is provided with an insertion portion 3 made of a flexible insertion tube, and an imaging element is provided at a distal end portion 4 located at the distal end of the insertion portion 3. An image signal from the image sensor is sent to the main unit 1 and a captured image of the subject is displayed on the display unit 107. An optical adapter 5 having a built-in optical system (lens) and a light emitting element for illumination can be attached to and detached from the distal end portion 4.

  FIG. 2 shows an internal configuration of the endoscope apparatus. In FIG. 2, only the configuration related to the light emitting element is illustrated, and the imaging element, the image processing circuit, and the like are not illustrated. Further, in the endoscope apparatus shown in FIG. 2, an LED is used as an example of a light emitting element.

  The system control unit 101, the LED drive power source 102, the current limiting circuit 103, the abnormal current detection circuit 104, the constant current circuit 105, the current value setting circuit 106, and the display unit 107 are provided in the main unit 1 shown in FIG. Yes. The system control unit 101 executes control of the entire endoscope apparatus. The LED drive power supply 102 supplies drive power to the LED 501 provided in the optical adapter 5. In normal operation, ON / OFF of the LED drive power source 102 is controlled by a control signal 100 a from the system control unit 101. The control unit 102 a in the LED drive power supply 102 controls the amount of drive power supplied from the LED drive power supply 102 when an abnormal current flows through the LED 501.

  The current limiting circuit 103 limits the current value of the abnormal current that flows when a single failure occurs. In addition, when an abnormal current flows through the LED 501, the control unit 103 a in the current limiting circuit 103 switches the resistance value that determines the current value limited by the current limiting circuit 103 to control the current value to be small. To do. The abnormal current detection circuit 104 detects an abnormal current at the time of a single failure. In addition, the abnormal current detection circuit 104 outputs an abnormal current detection signal 100b indicating the presence or absence of an abnormal current to the system control unit 101, the LED drive power source 102, and the current limiting circuit 103.

  The constant current circuit 105 makes the current flowing through the LED 501 constant. Since the voltage drop at the LED 501, that is, the amount of light emitted from the LED 501 varies, a constant current circuit 105 is provided to make the amount of light emitted from the LED 501 constant. The current value setting circuit 106 sets the drive current value of the LED 501 in the constant current circuit 105 based on an instruction from the system control unit 101. A display unit 107 displays captured images, menus, and the like.

  FIG. 3 shows a circuit configuration of the abnormal current detection circuit 104. A resistor R1 is inserted in series with the line L1 through which the driving current of the LED 501 flows. A voltage corresponding to the voltage difference between both ends of the resistor R1 appears at the output terminal of the differential amplifier circuit OP1. The voltage comparison circuit OP2 outputs a signal corresponding to the result of comparing the output voltage of the differential amplifier circuit OP1 with the reference voltage. In order to prevent detection of abnormal current such as chattering or surge that flows suddenly in an extremely short time, it is desirable to provide a time constant to the output of the voltage comparison circuit OP2. The latch circuit RS holds the output voltage of the voltage comparison circuit OP2 and outputs it as an abnormal current detection signal 100b.

  Next, the operation of the endoscope apparatus shown in FIG. 2 will be described. At the time of imaging, the LED drive power source 102 is turned on by a control signal 100a from the system control unit 101. The voltage output from the LED drive power supply 102 is applied to the anode terminal of the LED 501 via the current limiting circuit 103 and the abnormal current detection circuit 104. At the same time, the current value setting circuit 106 sets the drive current value of the LED 501 in the constant current circuit 105 in accordance with the control signal 100 c from the system control unit 101. As a result, a constant current flows through the LED 501 by the constant current circuit 105, and the LED 501 is turned on.

  At the time of a single failure, the signal line L2 on the cathode terminal side of the LED 501 contacts the metallic exterior portion in the insertion portion 3 and is short-circuited to the ground GND, so an abnormal current flows through the LED 501 to the ground GND. At this time, the abnormal current detection circuit 104 detects the abnormal current, and the current limiting circuit 103 limits the current value of the abnormal current. Further, at least one of the following three operation examples based on the abnormal current detection signal 100b output from the abnormal current detection circuit 104 is performed.

  First, a first operation example will be described. The control unit 102a in the LED drive power supply 102 stops the supply of drive power by the LED drive power supply 102 when the abnormal current detection signal 100b indicates detection of an abnormal current. For example, the control unit 102a is configured as a switch circuit using an FET, and cuts the drive power supply line to the LED 501. Alternatively, when the drive voltage supply circuit of the LED 501 is configured with a DC / DC converter circuit, the control unit 102a stops the output of the DC / DC converter circuit. Further, the supply of drive power by the LED drive power supply 102 is not completely stopped, but the supply amount (drive voltage) of drive power is reduced to a level at which the influence of the abnormal current on the LED 501 is sufficiently reduced. May be.

  Next, a second operation example will be described. When the abnormal current detection signal 100b indicates the detection of abnormal current, the control unit 103a in the current limiting circuit 103 controls the current value limited by the current limiting circuit 103 as follows. FIG. 4 shows a circuit configuration of the current limiting circuit 103. The configuration excluding the control unit 103a is the same as that of the conventional current limiting circuit.

During normal operation, only the transistor Tr1 of the transistors Tr1 and Tr2 is turned on, and a main current flows through a path passing through the resistors R2 and R3. On the other hand, if the abnormal current flows, the voltage generated in the resistor R2, R3 by the abnormal current exceeds the base-emitter voltage V _be of the transistor Tr2, the base current flows, the transistor Tr2 is turned ON. For this reason, the base voltage of the transistor Tr1 decreases, and the current is limited.

The control unit 103a operates as follows. During normal operation, the abnormal current detection signal 100b is at H level and the transistor Tr3 is turned on, so that the gate voltage of the FET 1031 is substantially at GND level. As a result, since the gate-source voltage V _GS of the FET 1031 increases, the FET 1031 is turned on, and a main current flows through the path through the FET 1031.

On the other hand, when an abnormal current flows, the abnormal current detection signal 100b becomes L level and the transistor Tr3 is turned off, so that the gate voltage of the FET 1031 increases. As a result, the gate-source voltage V _GS of the FET 1031 is reduced, so that the FET 1031 is turned off and a main current flows through a path passing through the resistor R2. Thereby, the abnormal current can be limited. Further, the current can be limited so that the current value is smaller than the current value limited by the same part as the conventional current limiting circuit excluding the control unit 103a. Thus, by reducing the current limit value when an abnormal current flows, the LED 501 can be protected while maintaining the observable state without turning off the LED 501.

  Next, a third operation example will be described. When the abnormal current detection signal 100b indicates the detection of abnormal current, the system control unit 101 displays an error message or a warning message on the display unit 107. As a result, it becomes possible for the user to recognize the abnormality of the apparatus, and it is expected that the user who has recognized the abnormality of the apparatus turns off the LED drive power supply 102. In the present embodiment, the display unit 107 performs display as a method for notifying the user. However, the present invention is not limited to this, and a warning sound may be emitted or a warning lamp may be turned on.

  As described above, according to the present embodiment, when an abnormal current is detected, it is possible to execute a predetermined function that leads to a decrease in the abnormal current. The influence on the board | substrate and optical adapter which mount a light emitting element can be reduced. Therefore, the light emitting element, the substrate, and the optical adapter can be prevented from being damaged and the life can be extended.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 5 shows the internal configuration of the endoscope apparatus according to the present embodiment. The endoscope apparatus according to the present embodiment is an endoscope apparatus having a function of determining the attachment / detachment state and type of an optical adapter. And a determination resistor 502 is provided in the optical adapter 5. Other configurations are the same as those of the first embodiment.

  The determination power supply 108 supplies power necessary for determining the attachment / detachment state and type of the optical adapter 5. ON / OFF of the determination power supply 108 is controlled by a control signal 100 d from the system control unit 101. The determination circuit 109 determines the attachment / detachment state and type of the optical adapter 5. The resistance value of the determination resistor 502 varies depending on the type of the optical adapter 5.

  Hereinafter, the operation of the endoscope apparatus according to the present embodiment will be described. The LED drive power supply 102 and the determination power supply 108 are controlled by the system control unit 101 so that they are not turned ON at the same time. When one is ON, the other is OFF. First, the determination power supply 108 is turned on by the control signal 100d from the system control unit 101 in a state where both the LED drive power supply 102 and the determination power supply 108 are OFF.

  The output voltage of the determination power supply 108 is applied to the determination resistor 502, and the output voltage of the determination resistor 502 is applied to the determination circuit 109. The determination circuit 109 determines the attachment / detachment state and type of the optical adapter 5 based on this voltage, and outputs a signal 100e indicating the determination result to the system control unit 101. When the optical adapter 5 is attached, the system control unit 101 outputs a control signal 100c for setting a current value according to the type of the optical adapter 5, that is, the LED 501 to the current value setting circuit 106. It should be noted that the current values corresponding to the various optical adapters indicated by the control signal 100 c output to the current value setting circuit 106 are determined with reference to a table stored in advance in the system control unit 101. The current value setting circuit 106 sets the drive current value of the LED 501 for the constant current circuit 105 according to the control signal 100 c output from the system control unit 101.

  Further, the system control unit 101 turns off the determination power supply 108 by the control signal 100d and turns on the LED drive power supply 102 by the control signal 100a. As a result, a constant current flows through the LED 501 by the constant current circuit 105, and the LED 501 is turned on.

  The operation at the time of a single failure is the same as in the first embodiment. Therefore, also in the present embodiment, as in the first embodiment, it is possible to reduce the influence of the abnormal current on the light emitting element and the like. Moreover, according to this embodiment, the following effects are also acquired.

  As shown in FIG. 5, the input terminal of the abnormal current detection circuit 104 is connected to the output terminal of the LED drive power supply 102 via the current limiting circuit 103, and the output terminal of the abnormal current detection circuit 104 is the output terminal of the determination power supply 108. And the input terminal of the LED 501. Therefore, when the LED drive power supply 102 is ON, the drive current from the LED drive power supply 102 flows to the abnormal current detection circuit 104 and the LED 501. On the other hand, when the determination power supply 108 is ON, the output impedance of the abnormal current detection circuit 104 is sufficiently higher than the input impedance of the LED 501, so that the current from the determination power supply 108 hardly flows to the abnormal current detection circuit 104. It flows to LED501.

  In other words, when the LED 501 is driven, the drive power from the LED drive power supply 102 is supplied to the LED 501 via the abnormal current detection circuit 104, and when the determination circuit 109 makes a determination, the determination power supply 108 Is supplied to the LED 501 and the determination circuit 109 without passing through the abnormal current detection circuit 104. If the abnormal current detection circuit 104 is inserted in series into the power supply line of the determination power supply 108, the attachment / detachment state and type of the optical adapter 5 cannot be correctly determined due to variations in the voltage drop of the abnormal current detection circuit 104 or the like. . However, by disposing the abnormal current detection circuit 104 at a position that does not affect the power supply from the determination power supply 108 as in the present embodiment, the attachment / detachment state and type of the optical adapter 5 can be correctly determined. .

(Third embodiment)
Next, a third embodiment of the present invention will be described. FIG. 6 shows the internal configuration of the endoscope apparatus according to the present embodiment. In the endoscope apparatus according to the present embodiment, the part related to the abnormal current detection circuit 110 is different from that of the second embodiment, but the rest is the same as that of the second embodiment. The operation after detecting the abnormal current is the same as that of the first embodiment.

  In this embodiment, in order to detect the voltage of the line L3 to which the LED 501 is connected, the abnormal current detection circuit 110 is connected in parallel to the line L3 to which the driving power of the LED 501 is supplied from the LED driving power source 102. In the normal state in which the LED 501 is driven, the voltage of the line L3 is a voltage obtained by subtracting the voltage drop in the current limiting circuit 103 from the output voltage of the LED drive power supply 102. On the other hand, since the cathode terminal of the LED 501 is connected to the ground GND at the time of a single failure, the voltage of the line L3 connected to the anode terminal of the LED 501 becomes a voltage determined by the forward voltage of the LED 501.

  As described above, when a single failure occurs, the voltage of the line L3 changes. Therefore, it is possible to detect an abnormal current by detecting this voltage change. The abnormal current detection circuit 110 according to the present embodiment detects an abnormal current based on the result of comparing the voltage of the line L3 and the reference voltage. Since the number of serially connected individual LED elements constituting the LED 501 varies depending on the type of the optical adapter 5, the forward voltage of the LED 501 varies depending on the type of the optical adapter 5. That is, it is necessary to change the reference voltage to be compared with the voltage of the line L3 according to the type of the optical adapter 5. Therefore, the system control unit 101 outputs an optical adapter identification signal 100f corresponding to the type of the optical adapter 5 determined by the determination circuit 109 to the abnormal current detection circuit 110, and the abnormal current detection circuit 110 outputs the optical adapter identification signal 100f. The reference voltage is set based on

  FIG. 7 shows a circuit configuration of the abnormal current detection circuit 110. The voltage of the line L3 and the reference voltage are input to the voltage comparison circuit OP3. The voltage comparison circuit OP3 outputs a signal corresponding to the result of comparing the voltage of the line L3 and the reference voltage. This signal is input to the latch circuit RS2 through the filter F1 for preventing chattering. The latch circuit RS2 holds the input signal and outputs it as an abnormal current detection signal 100b.

  The reference voltage compared with the voltage of the line L3 is a voltage obtained by dividing the power supply voltage by the resistor R4 and the variable resistor unit 110a. The variable resistance unit 110a is a circuit in which a plurality of series circuits composed of resistors and transistors are connected in parallel. In the abnormal current detection circuit 110 shown in FIG. 7, the series circuit is partially omitted, but from the first series circuit including the resistor R5 and the transistor Tr4, the first circuit including the resistor Rn and the transistor Trn-1. n-4 series circuits up to n-4 series circuits are connected in parallel.

  The optical adapter identification signal 100f input from the system control unit 101 is an n-4 bit signal, and the signal of each bit is input to the base terminal of the transistor constituting each series circuit. Depending on the High / Low level of the signal of each bit, the transistor is turned on or off, and the resistance value of the variable resistance unit 110a changes. Therefore, by setting the High / Low level of each bit signal of the optical adapter identification signal 100f according to the type of the optical adapter 5, it is possible to generate an optimal reference voltage according to the type of the optical adapter 5. . The abnormal current detection circuit 110 shown in FIG. 7 can handle n-4 types of optical adapters, but the number of types is not limited. If the number of types of optical adapters is large, a decoder may be mounted to reduce the number of bits of the optical adapter identification signal.

  As described above, according to the present embodiment, an abnormal current can be detected based on the result of comparing the voltage of the line to which the light emitting element is connected and the reference voltage. Therefore, when an abnormal current is detected, by executing a predetermined function that leads to a decrease in the abnormal current, it is possible to reduce the influence of the abnormal current on the light emitting element as in the first embodiment. Further, the abnormal current can be detected more accurately by setting the reference voltage to be compared with the voltage of the line to which the light emitting element is connected to a voltage corresponding to the type of the optical adapter.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. FIG. 8 shows the internal configuration of the endoscope apparatus according to the present embodiment. In the endoscope apparatus according to the present embodiment, the part related to the abnormal current detection circuit 111 is different from that of the third embodiment, but the rest is the same as that of the third embodiment. The operation after detecting the abnormal current is the same as that of the first embodiment.

  In the third embodiment, the voltage of the line L3 on the anode side of the LED 501 is detected. However, in this embodiment, the voltage of the line L4 on the cathode side of the LED 501 is detected. A circuit 111 is connected. In a normal state in which the LED 501 is driven, the voltage on the line L4 is a voltage obtained by subtracting the voltage drop between the current limiting circuit 103 and the LED 501 from the output voltage of the LED driving power source 102. On the other hand, at the time of a single failure, the cathode terminal of the LED 501 is connected to the ground GND, so that the voltage of the line L4 becomes the ground level. The abnormal current detection circuit 111 according to the present embodiment detects an abnormal current based on the result of comparing the voltage of the line L4 with a reference voltage (voltage close to the ground level).

  FIG. 9 shows a circuit configuration of the abnormal current detection circuit 111. The abnormal current detection circuit 111 shown in FIG. 9 is the same as the abnormal current detection circuit 110 shown in FIG. 7 except for the portion related to the reference voltage. The reference voltage compared with the voltage of the line L4 is a voltage obtained by dividing the power supply voltage by the resistors R4a and R4b, and is set to a voltage close to the ground level according to the ratio of the resistance values of the resistors R4a and R4b.

  According to the present embodiment, as in the third embodiment, an abnormal current can be detected based on the result of comparing the voltage of the line to which the light emitting element is connected and the reference voltage. Therefore, when an abnormal current is detected, by executing a predetermined function that leads to a decrease in the abnormal current, it is possible to reduce the influence of the abnormal current on the light emitting element as in the first embodiment. Further, in the present embodiment, the abnormal current can be detected with a uniform reference voltage regardless of the type of the optical adapter, so that the configuration of the abnormal current detection circuit is simplified as compared with the third embodiment. be able to.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the above-described embodiments, and includes design changes and the like without departing from the gist of the present invention. . For example, in each of the above embodiments, the light emitting element is provided in the optical adapter. However, a light emitting element is provided at the distal end of the insertion portion, a light emitting element is provided in the main unit, and a light guide such as an optical fiber. May be used to guide the light from the light emitting element to the distal end of the insertion portion.

1 is an external view of an endoscope apparatus according to a first embodiment of the present invention. It is a block diagram which shows the internal structure of the endoscope apparatus by the 1st Embodiment of this invention. It is a circuit diagram which shows the circuit structure of the abnormal current detection circuit with which the endoscope apparatus by the 1st Embodiment of this invention is provided. It is a circuit diagram which shows the circuit structure of the current limiting circuit with which the endoscope apparatus by the 1st Embodiment of this invention is provided. It is a block diagram which shows the internal structure of the endoscope apparatus by the 2nd Embodiment of this invention. It is a circuit diagram which shows the circuit structure of the current limiting circuit with which the endoscope apparatus by the 3rd Embodiment of this invention is provided. It is a circuit diagram which shows the circuit structure of the abnormal current detection circuit with which the endoscope apparatus by the 3rd Embodiment of this invention is provided. It is a circuit diagram which shows the circuit structure of the current limiting circuit with which the endoscope apparatus by the 3rd Embodiment of this invention is provided. It is a circuit diagram which shows the circuit structure of the abnormal current detection circuit with which the endoscope apparatus by the 3rd Embodiment of this invention is provided.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Main unit, 2 ... Scope unit, 3 ... Insertion part, 4 ... Tip part, 5 ... Optical adapter, 101 ... System control part (function execution means), 102. ..LED drive power supply, 102a, 103a ... control unit (function execution means), 103 ... current limiting circuit (current limiting means), 104,110,111 ... abnormal current detecting circuit (abnormal current detecting means) ), 105... Constant current circuit, 106... Current value setting circuit, 107... Display unit, 108. (Light emitting element), 502... Resistance for determination

Claims (9)

A power supply for supplying driving power to the light emitting element;
An abnormal current detecting means for detecting an abnormal current flowing in the light emitting element;
Function execution means for executing a predetermined function when the abnormal current is detected by the abnormal current detection means;
An endoscope apparatus comprising: In an endoscope apparatus in which an optical adapter incorporating an optical system and the light emitting element can be attached to and detached from the distal end of an insertion portion
Determination means for determining at least one of the attachment state and type of the optical adapter;
A power supply for determination that supplies power necessary for determination by the determination means;
The endoscope apparatus according to claim 1, further comprising: When driving the light emitting element, driving power from the power source is supplied to the light emitting element via the abnormal current detection means,
The power from the power source for determination is supplied to the light emitting element and the determination unit without passing through the abnormal current detection unit when the determination unit performs the determination. Endoscope device.   The endoscope apparatus according to claim 1, further comprising a current limiting unit that limits a current value of the abnormal current.   The predetermined function executed by the function execution unit is to control a supply amount of driving power from the power source when the abnormal current is detected by the abnormal current detection unit. The endoscope apparatus according to any one of claims 1 to 4.   The predetermined function executed by the function executing unit is to control a current value limited by the current limiting unit when the abnormal current is detected by the abnormal current detecting unit. The endoscope apparatus according to claim 4.   5. The predetermined function executed by the function execution unit is to notify a user when the abnormal current is detected by the abnormal current detection unit. The endoscope apparatus according to any one of the above.   8. The abnormal current detection unit detects the abnormal current based on a result of comparing a voltage of a line to which the light emitting element is connected and a reference voltage. 9. Endoscope device.   The endoscope apparatus in which an optical adapter incorporating an optical system and the light emitting element can be attached to and detached from a distal end of an insertion portion, wherein the reference voltage is set to a voltage corresponding to the type of the optical adapter. The endoscope apparatus according to 8.

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