JP2011010949A - Endoscope device, endoscope system, and adaptor for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an endoscope device, and an endoscope system, in which the kind of adaptor is correctly discriminated even where LED drive voltage is low.SOLUTION: A device body 2 includes wiring L1 connected to each one end of an LED and a discrimination Rb provided on an adaptor 3 installed on an endoscope insertion part, a power supply connected to the wiring L1, wiring L2 connected to the other end of the LED, an LED drive circuit 12 to control supply of drive current for light emission of the LED through the wiring L2, wiring L3 connected to the other end of a resistance Rb, and an ADC 14 to discriminate the adaptor 3 based on current fed through the wiring L3 to the resistance Rb.

Description

  The present invention relates to an endoscope apparatus, an endoscope system, and an endoscope adapter.

  Conventionally, endoscopes have been widely used in the industrial and medical fields. The endoscope has an insertion portion, and an imaging circuit and an optical lens are built in the distal end portion of the insertion portion. For example, in some industrial endoscopes, an adapter can be attached to the distal end portion of the insertion portion. The adapter is, for example, an optical adapter that changes the viewing angle of an endoscopic image.

  In an endoscope in which an adapter is connected to the distal end portion of the insertion portion, a function capable of automatically identifying the adapter type when the adapter is attached to the endoscope distal end portion is required. Therefore, a conductive wire for determining the type of adapter and a conductive wire for driving a light emitting diode (hereinafter referred to as LED) as a light source are shared, and the connection wiring to the adapter is made into a two-wire system. A technology has been proposed in which an identification resistor preset for each adapter type is built in, and the adapter is identified by switching the power supplied to the adapter and applying a voltage below the LED drive voltage to the identification resistor. (For example, refer to Patent Document 1).

  FIG. 8 is a circuit diagram for explaining a conventional two-wire adapter identification method. The endoscope system 100 includes a main body device, a scope unit having an insertion portion, and an adapter attached to a distal end portion of the insertion portion. In FIG. 8, the scope unit which is an endoscope is omitted, and the main body apparatus 101 and the optical adapter 102 as an adapter are illustrated.

  The optical adapter 102 includes three LEDs connected in series and an identification resistor Rb connected in parallel to the three LEDs. The reason why a plurality of (three in this case) LEDs are used is that a single LED cannot provide the necessary amount of light.

  The main unit 101 is used to identify a controller 111, an LED drive circuit 112, a power supply switch 113, and an adapter type that include a central processing unit (CPU) as a main processor and its peripheral circuits. An analog-to-digital converter (hereinafter abbreviated as ADC) 114 and a main body side resistor Rc used for adapter identification.

The resistance value of the main body side resistor Rc is sufficiently large in consideration of sharing of the conductive line for determining the optical adapter 102 and the conductive line for driving the LED.
The control unit 111 includes a general control circuit for controlling the CPU, memory, and peripheral circuits.
The LED drive circuit 112 performs LED drive control by a control signal from the control unit 111. FIG. 8 shows an example in which the LED drive circuit 112 is realized by a digital-analog converter (hereinafter abbreviated as DAC), an operational amplifier, two transistors connected in Darlington, and a resistor.

There are two types of power supply units: a power supply used for LED driving (V _LED ) and a power supply used for adapter identification (V _CC ). The power supply switch 113 controls the power supply switch control signal from the control unit 111. Take a configuration that can be switched. V _LED is set three voltage greater than the driving voltage (3 × _{V F)} of the LED of the optical adapter in _{102, V CC} has three LED drive electric Zhuang (3 × _{V F)} smaller voltage than Set. Further, in the example of FIG. 8, a protective resistor Ra having a sufficiently large resistance value is inserted as a protective circuit of the two power supply switching circuit unit.

As described above, FIG. 8 shows a case where three LEDs as light emitting elements are used in the optical adapter 102. Further, the resistance value of the resistor Rb is different for each adapter type in order to identify the adapter type. The identification resistor Rb is connected in parallel with three LEDs connected in series, and the resistance value of the resistor Rb needs to be sufficiently large so that no current flows when the LED is driven. Here, the current that flows through the three LEDs is I _LED , and the current that flows through the identification resistor Rb is _IRb . Moreover, the LED driving voltage of a single LED and V _F. In the case of FIG. 8, in order to drive three LEDs connected in series, a voltage of 3 × V _F [V] or more is required.

  In the example of FIG. 8, the LEDs are connected in the forward direction, and the main unit 101 and the optical adapter 102 are configured such that the power source is connected to the anode side of the LED and the ground (E) is connected to the cathode side. Yes.

FIG. 9 is a diagram illustrating the VI characteristics of the LED.
In the case of one LED, the LED hardly flows current (I _LED ) below a certain threshold voltage (here, LED driving voltage (V _F [V])), and when the voltage becomes V _F [V] or higher. Has the property of flowing current. When three LEDs are connected in series, the LED does not drive unless a voltage is applied up to 3 × V _F [V] as an LED driving voltage.

Regarding the conventional two-wire adapter identification method, (a) when driving an LED, (b) each operation when identifying an adapter will be described. FIG. 10 is an equivalent circuit for driving an LED, and FIG. 11 is an equivalent circuit for identifying an optical adapter.
(A) Operation when driving LED
When driving the LED, the control unit 111 can drive the LED by switching the power source to the V _LED side by the power switch 113 and turning on the Darlington transistor via the DAC by a control signal from the control unit 111. I can do it.

At this time, in the optical adapter 102, as shown in FIG.
I ₁ = I _LED + I _Rb (1)
However, I ₁ is a current supplied from the V _LED side. Although the power supply voltage (V _LED ) for driving the _LED is sufficiently larger than the LED driving voltage (3 × V _F [V]), almost no current flows through the identification resistor Rb (that is, I _Rb ≈0 [A ]), The expression (1) is almost equivalent to the following expression (2).
I ₁ ≒ I _LED (2)
(B) Operation for identifying optical adapter When identifying the optical adapter 102, the control unit 111 switches the power source to the _VCC side by the power switch 113 and simultaneously drives the LED through the DAC by the control signal from the control unit 111. The circuit 112 is turned off. At this time, in the optical adapter 102, as shown in FIG. Hereinafter, the resistance values of the resistors Ra, Rb, and Rc are expressed as Ra, Rb, and Rc, respectively.
I ₁ = I _LED + I _Rb (3)
V _CC = (Ra + R + Rc) · I ₁ (4)
1 / R = 1 / Rb + 1 / _RL (5)
V ₃ = I ₃ · Rc (6)
I ₁ = I ₃ (7)
Here, _RL is an apparent resistance component of the LED unit, and when the power supply voltage (V _CC ) for identifying the adapter is sufficiently smaller than the LED drive voltage (3 × V _F [V]), The following equation holds.
R _L ≒ ∞ [Ω]
I _LED ≒ 0 [A]
From the above, the following equation (8) holds, the resistance values of the resistors Rc and Ra are set to appropriate values, and the identification resistor Rb is the voltage V ₃ applied to the point C in FIG. 8 (and FIG. 11). It is a conventional method that can be identified if it is known. This is the case when the LED is forward-connected.
Rb = Rc · (V _CC / V ₃ −1) −Ra (8)

JP 2007-44073 A

However, in recent years, the performance of LEDs has improved, and there are cases where a single LED can obtain a sufficient amount of light. In such a case, in the conventional method described above, the LED drive voltage (V _F ) is low, so if the identification voltage (V _CC ) used for adapter identification is reduced (for example, 3.3 V), the characteristics of the LED The current (I _LED ) flowing to the LED side cannot be ignored (see FIG. 9). For this reason, the apparent resistance component _RL of the LED portion shown in FIG. 11 cannot be ignored, and the adapter cannot be accurately identified unless the resistance value of _RL is known in addition to the potential at the point C. Furthermore, the apparent resistance _RL is difficult to calculate accurately in advance in the above cases due to variations in LED components and the influence of the usage environment (mainly temperature conditions). There was a drawback that could not be accurately determined.

  Therefore, an object of the present invention is to provide an endoscope apparatus and an endoscope system that can accurately determine the adapter type even when the LED drive voltage is low.

  According to one aspect of the present invention, an adapter attached to an endoscope insertion portion or a first wiring connected to one end of each of a light emitting element and an identification resistor provided in the endoscope insertion portion; Control of supply of a power source connected to the first wiring, a second wiring connected to the other end of the light emitting element, and a drive current for causing the light emitting element to emit light via the second wiring A light emitting element drive control circuit for performing the above operation, a third wiring connected to the other end of the identification resistor, and the adapter or the endoscope based on a current flowing through the third wiring to the identification resistor. An endoscope apparatus having an identification circuit for identifying an insertion portion can be provided.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is a case where LED drive voltage is low, the endoscope apparatus and endoscope system which can discriminate | determine an adapter classification correctly can be provided.

1 is a configuration diagram showing a configuration of a figure endoscope system 1 according to a first embodiment of the present invention. It is an equivalent circuit for demonstrating operation | movement when identifying the optical adapter concerning the 1st Embodiment of this invention. It is an equivalent circuit for demonstrating operation | movement when identifying the optical adapter concerning the 1st Embodiment of this invention. It is a block diagram which shows the structure of 1 A of endoscope systems which concern on the modification of the 1st Embodiment of this invention. It is a block diagram which shows the structure of the endoscope system 1B in connection with the 2nd Embodiment of this invention. It is an equivalent circuit for demonstrating the operation | movement in the case of identifying the optical adapter in connection with the 2nd Embodiment of this invention. It is an equivalent circuit for demonstrating the operation | movement in the case of identifying the optical adapter in connection with the 2nd Embodiment of this invention. It is a circuit diagram for demonstrating the conventional 2-wire type adapter identification method. It is a figure which shows the VI characteristic of LED. This is a conventional equivalent circuit for driving an LED. It is the conventional equivalent circuit in the case of identifying an optical adapter.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
First, the configuration of the endoscope system according to the present embodiment will be described with reference to FIG. FIG. 1 is a configuration diagram showing a configuration of an endoscope system 1 according to the present embodiment.

  The endoscope system 1 includes a main body device as an endoscope device, a scope unit having an insertion portion, and an adapter attached to a distal end portion of the insertion portion. In FIG. 1, the scope unit is omitted, and the main body device 2 and the optical adapter 3 as an adapter are illustrated.

  The main unit 2 is used for a control unit 11 including a central processing unit (CPU) as a main processor and its peripheral circuits, an LED drive circuit 12, a power switch 13, and an adapter type identification. It is composed of an ADC 14 and a main body side resistor Rc used for adapter identification.

  The optical adapter 3 has one LED and a resistor Rb connected in parallel to the LED. As shown in the figure, the anode side of the LED and one end of the resistor Rb are connected by a conductive line L1 which is a common wire with the main body device 2. The cathode side of the LED and the other end of the resistor Rb are connected to the main unit 2 by conductive lines L2 and L3, respectively. In the endoscope system of the present embodiment, the main body device 2 (specifically, the insertion portion) and the adapter 3 are connected by three lines instead of the conventional two lines. Therefore, the main body device 2 and the adapter 3 each have three connection terminals T electrically connected by three wires.

The resistance value of the resistor Rc on the main body side does not necessarily have to be as large as the resistance value of the conventional resistor Rc in FIG. 8, and the resistance value by which the optical adapter 3 can be discriminated from the relationship with the resistance value of the resistor Rb. If it is.
The control unit 11 includes a general control circuit for controlling the CPU, the memory, and its peripheral circuits.
The LED drive circuit 12 performs LED drive control according to a control signal from the control unit 11. FIG. 1 shows an example in which the LED drive circuit 12 is implemented by a DAC, an operational amplifier, and two Darlington-connected transistors. It may be realized. The LED drive circuit 12 is a light emitting element drive control circuit that controls supply of a drive current for causing the LED to emit light.

There are two types of power supply units: a power source used for LED driving (V _LED ) and a power source used for adapter identification (V _CC ). The power source switch 13 controls the power source switch control signal from the control unit 11. Take a configuration that can be switched. V _LED is set larger voltage than the driving voltage (V _F) of the LED is, V _CC, regardless of the LED driving electric Zhuang (V _F), the voltage can identify the resistance Rb of the adapter 3 is set The In the example of FIG. 1, a protective resistor Ra having a sufficiently large resistance value is inserted as a protective circuit for the two power supply switching circuit unit.
The control unit and the ADC 14 constitute an identification circuit for identifying the optical adapter 3 based on the current flowing through the identification resistor Rb.
The power supply changeover switch 13 constitutes a changeover switch for connecting the power supply (V _LED ) to the LED and connecting the power supply (V _CC ) to the identification resistor Rb.

As described above, in FIG. 1, one LED as a light emitting element is used for the optical adapter 3. Since there is one LED, the LED drive voltage is low. Further, the resistance value of the resistor Rb is different for each adapter type in order to identify the adapter type. The identification resistor Rb is connected in parallel with the LED. Here, the current flowing through the LED is I _LED , and the current flowing through the identification resistor Rb is _IRb .

  In the present embodiment, the LEDs are connected in the forward direction. In the main unit 2 and the optical adapter 3, the anode side of the LED and one end of the resistor Rb are connected to the power source via the conductive line L1, and the cathode side of the LED is connected to the LED drive circuit 12 via the conductive line L2, and the resistor Rb Are connected by three wires so that the other end is connected to the resistor Rc via the conductive wire L3. In other words, the connection between the main unit 2 and the optical adapter 3 is a three-wire connection in which the conductive wire on the anode side of the LED is shared with the resistor Rb, and the conductive wire on the cathode side of the LED is not shared with the resistor Rb. Yes.

Next, regarding the three-wire adapter identification method according to the present embodiment, (a) when driving an LED and (b) operations when identifying an optical adapter will be described. 2 and 3 are equivalent circuits for explaining the operation in identifying the optical adapter.
(1) Operation when driving LED
When driving the LED, the control unit 11 switches the power switch 13 to the V _LED side by the power switch control signal (that is, _VCC is OFF), and the Darlington transistor via the DAC by the control signal from the control unit 11 The LED can be driven by turning ON. At this time, since the resistance _Rb for identification has a sufficiently large resistance value, the current (I _Rb ) does not flow when the LED is driven, that is, it can be considered that it is almost 0 [A]. Therefore, at this time, the following expression is established in the optical adapter 3.
I ₁ ≒ I _LED (9)
(2) Operation when identifying an adapter When identifying an adapter, the control unit 11 switches the power source switch 13 by the power source switch control signal to switch the power source to the _VCC side (V _LED side is OFF). The LED drive circuit 12 is turned off through the DAC by the control signal. At this time, since the LED driving transistor is completely OFF, the equivalent circuits are as shown in FIGS. In FIG. 2, the transistor for driving the LED is shown as a switch in an OFF state.

At this time, in the adapter 3, as shown in the equivalent circuit of FIG.
I ₃ = I _Rb (10)
V _CC = (Ra + Rb + Rc) · I ₃ (11)
V ₃ = I ₃ · Rc (12)
As described above, the resistance value of the identification resistor Rb is simply obtained by the following equation (13), and the voltage (V ₃ ) applied to the point C, which is the connection point between the lead wire L3 and the resistor Rc, is determined by the ADC 14. By measuring based on the output data, the control unit 11 can accurately calculate the resistance value of the resistor Rb.
Rb = (V _CC / V ₃ −1) · Rc−Ra (13)
As described above, according to the endoscope system of the present embodiment described above, the adapter type can be accurately determined even when the LED drive voltage is low.
As a result, according to the endoscope system of the present embodiment, a large number of adapter types can be secured even when an LED with a low driving voltage, for example, one LED is used.

Next, a modification of the present embodiment will be described.
FIG. 4 is a configuration diagram showing a configuration of an endoscope system 1A according to a modification of the first embodiment. The endoscope system 1A of FIG. 4 is different from the endoscope system 1 of the first embodiment in that there is no power switch 13 and the power source is only V _LED .

In the endoscope system 1A of FIG. 4, when the LED is driven, most of the current from the power source V _LED flows to the _LED when the LED drive circuit 12 is turned on. The circuit 12 is turned off, and the resistance values of the resistors Rb and Rc are set so that the current from the power supply V _LED flows only through the resistors Rb and Rc.

  Specifically, when the LED is turned on, the control unit 11A turns on the LED drive circuit 12 so that a current flows through the LED. At this time, almost no current flows through the resistor Rb. Further, when determining the type of the optical adapter 3, if the control unit 11A turns off the LED drive circuit 12 so that no current flows through the LED, the current flows only through the resistor Rb. The controller 11A can determine the type of the optical adapter 3 from the potential at the point C by the current flowing through the resistor Rb.

In addition to the effect of the first embodiment, this modification has the effect of reducing the apparatus cost because the power supply switch 13 is not necessary.
(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the first embodiment, the conductive line on the anode side of the LED is shared with the identification resistor Rb. In the second embodiment, a three-wire adapter is used as in the first embodiment. Although the identification method is adopted, the conductive wire on the cathode side of the LED package is shared with the resistance Rb for identification.

  FIG. 5 is a configuration diagram showing a configuration of an endoscope system 1B according to the second embodiment of the present invention. In FIG. 5, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. In this embodiment, the case where the number of LEDs is one will be described as a case where the driving voltage of the LEDs is low.

As shown in FIG. 5, in the main unit 2B and the optical adapter 3A, one end of the identification resistor Rb is connected to the power source (V _CC ) via the conductive line L4 and the power supply switch 13A, and the anode side of the LED is the conductive line. 3 is connected to the power source (V _LED ) via L5 and the power supply switch 13A, and the cathode side of the LED and the other end of the resistor Rb are connected to the LED driving circuit 12 and the resistor Rc via the conductive line L6. Connected with wires. In other words, the connection between the main unit 2 and the optical adapter 3 is a three-wire connection in which the conductive wire on the cathode side of the LED is shared with the resistor Rb, and the conductive wire on the anode side of the LED is not shared with the resistor Rb. Yes. Therefore, the main body device 2B and the adapter 3A each have three connection terminals T electrically connected by three wires.

There are two types of power supply units: a power supply used for LED driving (V _LED ) and a power supply used for adapter identification (V _CC ). In the power supply selector switch 13A, only one of them is connected via a corresponding conductive line. And is supplied to the optical adapter 3A. The V _LED is set to a voltage larger than the LED drive voltage (V _F ). V _CC is set to a voltage that can identify the resistance Rb of the optical adapter 3A regardless of the LED. In the example of FIG. 5, a diode D is inserted as a protection circuit for two power supplies. The diode forward drop voltage of the diode D is _{defined as VFd} . As a protection circuit, a resistor may be used instead of the diode D.

The control unit 11B has the same configuration as the control units 11 and 11A of the first embodiment, and outputs a power supply switching control signal for controlling the switch 13A.
The switch 13A includes a first switch SW1 that controls connection of the power supply (V _CC ) to the conductive line L4, and a second switch SW2 that controls connection of the power supply (V _LED ) to the conductive line L5. One of the switches is turned on based on the power supply switching control signal from the control unit 11B. That is, the switch 13A constitutes a changeover switch for connecting the power source (V _CC ) to the identification resistor Rb and connecting the power source (V _LED ) to the LED.
The ADC 14 and the LED drive circuit 12 are connected to a connection point between the resistor Rc and the wiring L6.

Next, regarding the three-wire adapter identification method according to the present embodiment, (a) when driving an LED and (b) operations when identifying an optical adapter will be described. 6 and 7 are equivalent circuits for explaining the operation in identifying the optical adapter.
(1) Operation when driving LED
When driving the LED, the control unit 11B turns on the second switch SW2 of the power switch 13A by the power switch control signal to switch the power to the V _LED side (at this time, the first switch SW1 is OFF). Further, the LED can be driven by turning on the Darlington transistor via the DAC by the control signal from the control unit 11B. When the LED is driven, no current (I _Rb ) flows through the identification resistor Rb. Further, since the resistance Rc on the main body side has a sufficiently large resistance value, almost no current flows through the resistor Rc, and almost all current flows through the transistor side when the LED is driven.
Therefore, at this time, the following equation is established in the optical adapter 3A.
I ₁ ≒ I _LED (14)
(2) Operation when identifying an adapter When identifying an adapter, the control unit 11B turns on the first switch SW1 of the power switch 13A according to the power switch control signal and switches the power to the _VCC side (this At the same time, the second switch SW2 is OFF), and at the same time, the LED drive circuit 12 is turned OFF through the DAC by the control signal. At this time, since the LED driving transistor is completely OFF, the equivalent circuits are as shown in FIGS. In FIG. 6, the transistor for driving the LED is shown as a switch in an OFF state.

At this time, in the optical adapter 3A, as shown in the equivalent circuit of FIG.
I ₃ = I _Rb (15)
V _CC = V _Fd + (Rb + Rc) · I ₃ (16)
V ₃ = I ₃ · Rc (17)
Thus, the resistance value of the identification resistor Rb is simply obtained by the following equation (18). By measuring the voltage (V ₃ ) applied to the point C based on the output data of the ADC 14, The controller 11B can accurately calculate the resistance value of the resistor Rb.
_{Rb = Rc · (V Fd +} V 3 -V CC) / V 3 ····· (18)
As described above, according to the endoscope system of the present embodiment, the adapter type can be accurately determined even when the LED drive voltage is low.

  As a result, according to the endoscope system of the present embodiment, a large number of adapter types can be secured even when a light emitting element with a low driving voltage, for example, one LED is used.

  As described above, according to the above-described first (including modification) and second embodiments, even when the drive voltage of the light emitting element is low, for example, when one LED is used. Also, the resistance value for the adapter type can be calculated accurately.

As an effect associated with the above-described first (including modification) and second embodiments, there is an effect that the circuit configuration can be simplified because the design power of the identification power supply is increased.
Furthermore, since it is not necessary to consider the influence of the LED at the time of circuit design, it is only necessary to consider only the component variation of the identification resistor, so that the design man-hour can be greatly reduced.

  Furthermore, since the maximum number of adapter types can be designed within the range of variations in identification resistance and ADC accuracy, the number of adapter types can be increased as compared with the conventional case.

  In the above-described first (including modification) and second embodiments, an adapter provided with an LED and a resistance for identification is attached to the distal end portion of the insertion portion of the scope unit of the endoscope. As described in the example of determining the type of the adapter, it is a system in which different types of endoscopes can be attached to and detached from the main body device, and an LED and an identification resistor are provided in the insertion portion of the endoscope In this case, the configuration described in each of the above-described embodiments (including modifications) can be applied even when the insertion portion of the connected endoscope is determined (in other words, the endoscope is determined). . In that case, each of the main apparatus and the endoscope has three connection terminals T electrically connected by three wires.

  For example, the plurality of scope units have different optical performances such as viewing angles, and each of the above-described scope units is also used to determine which of the different scope units is connected to the main body device that is an endoscope apparatus. The configuration of the embodiment (including the modified example) is applicable.

  The present invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the scope of the present invention.

1, 1A, 1B endoscope system, 2, 2A, 2B main unit, 3, 3A optical adapter, 11, 11A control unit, 12 LED drive circuit, 13 power supply switch, 14 analog-digital converter

Claims (10)

A first wiring connected to one end of each of a light emitting element and an identification resistor provided in an adapter attached to the endoscope insertion portion or the endoscope insertion portion;
A power source connected to the first wiring;
A second wiring connected to the other end of the light emitting element;
A light emitting element drive control circuit for controlling supply of a drive current for causing the light emitting element to emit light through the second wiring;
A third wiring connected to the other end of the identification resistor;
An identification circuit for identifying the adapter or the endoscope insertion portion based on a current flowing through the third wiring to the identification resistor;
An endoscope apparatus characterized by comprising: The power supply is
A first power source;
A second power source;
A changeover switch for connecting the first power source to the light emitting element and connecting the second power source to the identification resistor;
The endoscope apparatus according to claim 1, further comprising:   The endoscope apparatus according to claim 1, wherein the light emitting element drive control circuit performs control so that the driving current is not supplied when the light emitting element does not emit light. A first resistor provided between the third wiring and ground;
The endoscope apparatus according to claim 1, wherein the identification circuit is connected to a connection point between the first resistor and the third wiring. An adapter attached to the endoscope insertion portion or a first wiring connected to one end of an identification resistor provided in the endoscope insertion portion;
A second wiring connected to one end of a light-emitting element provided in the adapter or the endoscope insertion portion attached to the endoscope insertion portion;
A first power source connected to the first wiring;
A second power source connected to the second wiring;
A changeover switch for connecting the first power source to the identification resistor and connecting the second power source to the light emitting element;
A third wiring connected to the other end of each of the light emitting element and the identification resistor;
A light emitting element drive control circuit for controlling supply of a drive current for causing the light emitting element to emit light through the third wiring;
An identification circuit for identifying an endoscope based on a current flowing to the identification resistor via the third wiring;
An endoscope apparatus characterized by comprising: A first resistor provided between the third wiring and ground;
The endoscope apparatus according to claim 5, wherein the identification circuit and the light emitting element drive control circuit are connected to a connection point between the first resistor and the third wiring. An endoscope system including an adapter having a light emitting element and an identification resistor or an endoscope insertion portion having the light emitting element and an identification resistor,
A first wiring connected to one end of each of the light emitting element and the identification resistor;
A power source connected to the first wiring;
A second wiring connected to the other end of the light emitting element;
A light emitting element drive control circuit for controlling supply of a drive current for causing the light emitting element to emit light through the second wiring;
A third wiring connected to the other end of the identification resistor;
An identification circuit for identifying the adapter or the endoscope insertion portion based on a current flowing through the third wiring to the identification resistor;
An endoscope system comprising: An adapter attached to the endoscope insertion portion,
A light emitting element;
An identification resistor;
A first connection terminal electrically connected to one end of each of the light emitting element and the identification resistor;
A second connection terminal electrically connected to the other end of the light emitting element;
A third wiring terminal electrically connected to the other end of the identification resistor;
An endoscope adapter comprising: An endoscope system including an adapter having a light emitting element and an identification resistor or an endoscope insertion portion having the light emitting element and an identification resistor,
A first wiring connected to one end of the identification resistor provided in the adapter;
A second wiring connected to one end of the light emitting element provided in the adapter;
A first power source connected to the first wiring;
A second power source connected to the second wiring;
A changeover switch for connecting the first power source to the identification resistor and connecting the second power source to the light emitting element;
A third wiring connected to the other end of each of the light emitting element and the identification resistor;
A light emitting element drive control circuit for controlling supply of a drive current for causing the light emitting element to emit light through the third wiring;
An identification circuit for identifying an endoscope based on a current flowing to the identification resistor via the third wiring;
An endoscope system comprising: An adapter attached to the endoscope insertion portion,
A light emitting element;
An identification resistor;
A first connection terminal electrically connected to one end of the identification resistor;
A second connection terminal electrically connected to one end of the light emitting element;
A third connection terminal electrically connected to the other end of each of the light emitting element and the identification resistor;
An endoscope adapter comprising:

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