JP2010136764A - Circuit board for driving emission element and endoscopic system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circuit board for driving an emission element corresponding to a plurality of illuminating emission elements different from each other and suppressed in an increase in cost. <P>SOLUTION: The circuit board 11b for driving the emission element is a circuit board loaded with a circuit for driving an illuminating LED 5 and has the power supply switching circuit part 23 or the like for driving a monocular LED 5 mounted on the circuit board 11b, at least a pair of the terminal parts C11 and C12 formed on the circuit board 11b to supply power to the power supply switching circuit part 23 and the circuit mounting region 21a or the like provided on the circuit board 11b in order to mount a current restricting circuit part 21 or the like, which is not used when the monocular LED 5 is driven but used when an LED 5 for an adaptor is driven. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a light emitting element driving circuit board and an endoscope system, and more particularly, to a light emitting element driving circuit board and an endoscope system on which a circuit for driving a light emitting element for illumination is mounted.

  In recent years, in the industrial field, industrial endoscopes are widely used for observation and inspection of internal scratches and corrosion of boilers, turbines, engines, chemical plants and the like. Also, in the medical field, an endoscope that can observe various organs and the like by inserting an elongated insertion portion into a body cavity and performing various therapeutic treatments using a treatment instrument inserted into a treatment instrument channel as necessary. Mirrors are widely used.

  In a system using these endoscopes, for example, an image signal of an observation image formed on an image sensor is transmitted to a signal processing unit of a camera control unit (hereinafter abbreviated as CCU) which is a main body device, and a video signal is transmitted. It is configured so that the subject can be observed by generating and displaying an endoscopic image on a monitor screen.

  Endoscopes originally have one or more light emitting elements built into the distal end of the insertion section (hereinafter also referred to as monocular), and one or more light emitting elements are built into the optical adapter attached to the distal end of the insertion section. (Hereinafter also referred to as adapter type).

  In the case of a monocular endoscope, a light emitting element for illumination, for example, a light emitting diode (hereinafter referred to as LED) is built-in, and its configuration (series and parallel) and the number are determined, and there is no change. It is driven with a predetermined constant current according to the configuration and number.

  On the other hand, in the case of an adapter-type endoscope, the built-in LED is driven at a constant current (see, for example, Patent Document 1), but the configuration (series and parallel) and the number of LEDs are at the distal end of the insertion portion. Since it differs depending on the type of optical adapter to be attached, the LED is driven with a constant current having a value corresponding to the type. That is, the LED drive current value varies depending on the type of optical adapter. Therefore, the type of the optical adapter attached to the insertion unit is determined, and the LED drive unit controls the drive current so that a current having a value corresponding to the determination result is supplied to the LED.

Since an endoscope system is configured by combining an endoscope (so-called scope unit) and a main body device, a monocular endoscope system in which a monocular endoscope is connected to the endoscope system. There are two types of adapter-type endoscope systems to which adapter-type endoscopes are connected.
JP 2005-349189 A

  As described above, there are two types of endoscope systems depending on the optical elements of the illumination unit, and the driving method of the LED drive unit, that is, the drive circuit unit of the illumination unit is different in the two types of systems. Different types are prepared corresponding to the types of endoscopes to be used. That is, conventionally, it has been necessary to prepare and place a monocular main device and an adapter main device. For this reason, since the board including the LED drive unit mounted on the main unit is also different according to the type of endoscope to be connected, it is costly to prepare a board according to the type. It was connected to.

  In order to reduce costs, it is conceivable that the substrate is a common substrate that can be used for both the monocular main unit and the adapter main unit. Therefore, a method of mounting two circuits of a conventional monocular LED drive circuit and an adapter type LED drive circuit on one substrate is also conceivable, but according to such a method, the size of the substrate is large. The problem of becoming.

  Furthermore, since the LED drive circuit for two types is included on a common substrate, for example, there are parts that are used in the case of an adapter-type endoscope system but are not used at all in a monocular system. As a result, there is a problem that the cost is always increased only by the cost of parts that are not used.

  The present invention has been made in view of the above problems, and provides a light-emitting element driving circuit board and an endoscope system that can cope with a plurality of light-emitting elements for illumination different from each other and suppress an increase in cost. For the purpose.

  According to one aspect of the present invention, there is provided a substrate on which a circuit for driving the first and second light emitting elements for illumination is mounted, which is mounted on the substrate and drives the first light emitting element. When driving the first light emitting element, the first circuit portion for driving, the at least one pair of terminal portions formed on the substrate for supplying power to the first circuit portion, and the first light emitting element Provided is a circuit board for driving a light emitting element, comprising: a circuit mounting area provided on the substrate for mounting a second circuit portion that is used when driving the second light emitting element without using it. can do.

  ADVANTAGE OF THE INVENTION According to this invention, the light emitting element drive circuit board and endoscope system which can respond | correspond to several light emitting elements for mutually different illumination, and suppressed the raise in cost are realizable.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The endoscope system according to the present embodiment is configured to include an endoscope (a so-called scope unit) and a main body device, and the main body device includes any of a monocular endoscope and an adapter type endoscope. Can also be connected. The main body device functions as a monocular endoscope device when a monocular endoscope is connected, and functions as an adapter endoscope device when an adapter endoscope is connected.

FIG. 1 is a configuration diagram illustrating a configuration of an endoscope system including a plurality of endoscopes and a main body device to which any of the plurality of endoscopes can be connected.
The endoscope system 100 is a system that can connect any one of a plurality of endoscopes 1 to the main body device 2 and display an endoscopic image on the monitor 3.

  The endoscope 1 includes a so-called monocular endoscope 1 </ b> A and a plurality of optical adapter endoscopes 1 </ b> B, each of which can be mounted with an optical adapter 4. Hereinafter, the term “endoscope 1” refers to any one endoscope or a plurality of endoscopes collectively. In each of the plurality of optical adapter type endoscopes 1B, different optical adapters 4 can be attached to the distal end portion of the insertion portion.

The monocular endoscope 1A is an endoscope in which an LED 5 as a light emitting element is built in at a distal end portion of the insertion portion.
As described above, the optical adapter type endoscope 1B is an endoscope having an insertion portion to which the optical adapter 4 can be attached, and the optical adapter 4 includes an LED 5. That is, in the optical adapter type endoscope 1B, the LED 5 as the illumination unit is built in the optical adapter 4, and the optical adapter (hereinafter also simply referred to as an adapter) 4 is attached to the distal end of the insertion unit, thereby illuminating the subject. An endoscope that can be.

  The monocular endoscope 1A and the LEDs incorporated in the optical adapter 4 are one or more LEDs, and are a group of LEDs connected in series or in parallel.

  In the present embodiment, the LED 5 built in the distal end portion of the monocular endoscope 1A and the LED 5 built in the optical adapter 4 are each a light emitting diode, but the light emitting element may be a laser diode or the like. Good.

  Each of the endoscopes 1A and 1B is provided with a memory 6 that stores endoscope type information. The memory 6 is a non-volatile storage unit, and is an endoscope type information storage unit that stores information indicating the type of endoscope whether the endoscope is a monocular type or an adapter type.

  The main unit 2 includes a CPU 2a and an LED drive circuit 2b. Various circuits including the CPU 2a and the LED drive circuit 2b are mounted on a substrate mounted in the main unit 2. The LED drive circuit 2b includes a constant current circuit and the like. The endoscope 1 is electrically connected to the main body device 2 via the connector 7 of the main body device 2, and the contents of the memory 6 are read out by the CPU 2a. The CPU 2a executes various programs for realizing various functions of the endoscope system 100.

  In addition to the information indicating the type of the endoscope 1, the memory 6 may include individual information for each endoscope, for example, information on the type of adapter that can be attached. There are some optical adapter type endoscopes 1B having different insertion diameters, for example, 4mm and 6mm types, and there are different types of adapters that can be installed for each endoscope. Information on possible adapters may be stored in the memory 6.

  As described above, both the monocular endoscope 1A and the adapter-type endoscope 1B can be connected to the main body apparatus 2 as the endoscope apparatus. When the monocular endoscope 1A is connected to the main body device 2, a monocular endoscope system is obtained, and when the adapter endoscope 1B is connected, an adapter endoscope system is obtained.

  However, the endoscope system 100 is manufactured as a monocular endoscope system with a monocular endoscope connected thereto, or an adapter endoscope system with an adapter endoscope connected thereto. Regardless of the type of endoscope system, a common substrate is used as the circuit board itself mounted on the main body device 2 regardless of the type of endoscope system.

  The circuit board itself is common and the same, but when the common circuit board is attached to a monocular endoscope system, it is a board on which all components are not mounted, and an adapter. In the case of being attached to a type endoscope system, it is a board on which all components are mounted.

  2 and 3 are schematic substrate configuration diagrams showing the configuration of part of various circuits mounted on the common substrate. FIG. 2 is a configuration diagram of the substrate 11a mounted on the optical adapter type main unit.

  The LED drive circuit 2b in the case of the optical adapter type includes a current limiting circuit unit 21, an overcurrent detection circuit unit 22, two power supply switching circuit units 23 and 24, an attachment / detachment detection circuit unit 25, and a lighting exclusive processing circuit unit. 26 and a constant current circuit unit 27. These various circuit units are mounted and mounted on the substrate 11a. Each circuit part is a circuit of a set of parts made up of a plurality of solid elements, a circuit of one semiconductor chip part as a whole, or a part of a set of parts of solid element and the other part is a semiconductor chip part And so on. The circuit portions are electrically connected by a plurality of wirings formed on the substrate 11a.

  A predetermined reference voltage from the reference power supply is supplied to various circuit units on the substrate 11a. In FIG. 2, it is particularly shown that the reference voltage is supplied to the current limiting circuit 21. Further, the reference voltage from the reference power supply is also supplied to the terminal C11 on the substrate 11a by wiring, and if the terminal C11 and the terminal C12 constituting the pair of terminal portions are connected, the reference voltage is also supplied to the power supply switching circuit portion 23. As described above, wiring on the substrate 11a is provided. Terminals C11 and C12 are lands, holes and the like formed in the middle of the wiring on the substrate 11a. Similarly to the terminals C11 and C12, terminals C13 and C14 described later are lands, holes, and the like provided on the substrate 11a.

  The current limiting circuit unit 21 receives a reference voltage, for example, 30 V from the reference power supply, and supplies a predetermined power to the power supply switching circuit unit 23. The overcurrent detection circuit unit 22 monitors the output of the current limiting circuit unit 21 and detects that an overcurrent has occurred in order to prevent an abnormal current from flowing to the LED 5 due to a short circuit at the distal end of the insertion unit. Then, an overcurrent detection signal ACO is output to the lighting exclusive processing circuit unit 26.

The power supply switching circuit unit 23 receives power from the current limiting circuit unit 21 and receives the lighting state signal LOS from the lighting exclusive processing circuit unit 26. The power supply switching circuit unit 23 supplies predetermined power to the LEDs 5 in the adapter 4 attached to the insertion unit of the endoscope 1B connected to the board 11a in response to the lighting state signal LOS.
The power supply switching circuit unit 24 is a circuit for switching to a power supply used when detecting the type of adapter. The power supply switching circuit unit 24 includes an optical adapter type determination circuit for determining the type of the optical adapter 4. The power supply switching circuit unit 24 is a circuit for supplying a predetermined current to the resistor 5a connected in parallel to the LED 5 and determining the type of the adapter 4 from the generated voltage.

  The attachment / detachment detection circuit unit 25 is a circuit that determines whether or not the adapter 5 is attached or whether or not the adapter 5 is detached and outputs an attachment / detachment state signal AS of the adapter 5 to the lighting exclusive processing circuit unit 26. .

  The lighting exclusive processing circuit unit 26 receives the adapter type detection signal ADO and the lighting signal LO from the CPU 2a, the overcurrent detection signal ACO from the overcurrent detection circuit unit 22, and the attachment / detachment state signal AS from the attachment / detachment detection circuit unit 25. Thus, it is a circuit that outputs a lighting state signal LOS and an adapter type detection signal EADO for controlling the power supply switching circuit units 23 and 24.

  The lighting exclusive processing circuit unit 26 is a circuit that, when receiving the lighting signal LO from the CPU 2a, supplies the lighting state signal LOS to the power supply switching circuit unit 23 based on the state of the attachment / detachment state signal AS and the overcurrent detection signal ACO. .

  The adapter type detection signal ADO from the CPU 2a is output and supplied to the lighting exclusive processing circuit unit 26 when the CPU 2a executes processing for detecting the type of adapter.

  When receiving the adapter type detection signal ADO from the CPU 2a, the lighting exclusive processing circuit unit 26 supplies the adapter type detection signal EDO to the power supply switching circuit unit 24.

  The lighting signal LO from the CPU 2 a is output in response to the operation of a predetermined operation button by the user of the endoscope 1 and is supplied to the lighting exclusive processing circuit unit 26. Further, the lighting signal LO is also supplied to the terminal C13 on the substrate 11a by wiring. If the terminal C13 and the terminal C14 constituting one terminal part are connected, the lighting signal LO is also supplied to the power supply switching circuit part 23. Thus, the substrate 11a is configured.

  The constant current circuit unit 27 is a circuit for supplying a predetermined constant current to the light emitting element 5 based on setting data from the CPU 2a.

  The CPU 2a supplies a predetermined constant current to the LED 5 according to the type of the endoscope 1 connected to the main unit 2 or the type of adapter attached to the distal end of the insertion portion of the endoscope 1B. In addition, the setting data is supplied to the constant current circuit unit 27.

  The board 11a shown in FIG. 2 is mounted on the main body device 2, and the adapter-type endoscope 1B is connected to the main body device 2, whereby the endoscope system 100 constitutes an adapter-type endoscope system.

  FIG. 3 is a configuration diagram of the substrate 11b mounted on the monocular main body device. The substrate 11b itself is the same as the substrate 11a, but the components mounted on the substrate are different from the substrate 11a. That is, one or more circuit units that are not used in the case of the monocular endoscope 1A are not mounted on the substrate 11b.

A predetermined resistor r1 is connected between the terminals C11 and C12 on the substrate, and a predetermined resistor r2 is connected between the terminals C13 and C14.
Accordingly, on the substrate 11b, a monocular internal view of the current limiting circuit unit 21, the overcurrent detection circuit unit 22, the power supply switching circuit unit 24, the attachment / detachment detection circuit unit 25, and the lighting exclusive processing circuit unit 26 is provided. Circuit portions that are not used in the case of the mirror 1A are not mounted in the circuit mounting regions 21a, 22a, 24a, 25a, and 26a in which they are to be mounted. In FIG. 3, portions indicated by dotted lines of the circuit portions 21a, 22a, 24a, 25a, and 26a are circuit mounting regions on the substrate 11b. In other words, only the circuit unit power supply switching circuit unit 24 and the constant current circuit unit 27 used in the case of the monocular endoscope 1A are mounted on the substrate 11b.

  When the monocular endoscope 1A is connected, the current supplied to the LED 5 is not changed, and there is no processing such as attachment / detachment detection related to the adapter. It is not mounted on the substrate 11b.

  Further, in the monocular endoscope system, a predetermined resistor r1 is connected between the terminals C11 and C12 in order to supply predetermined power to the power supply switching unit 23. Furthermore, in order to supply the lighting signal LO from the CPU 2a to the power supply switching unit 23, a predetermined resistor r2 is connected between the terminals C13 and C14.

  In other words, in the monocular endoscope system, only two circuit units necessary for LED driving are mounted on the board 11b, and further, an electric power for supplying necessary power and signals to the two necessary circuit units. A connection is made.

  The substrate 11b has a configuration in which wiring or the like is provided so that power or signals from the current limiting circuit unit 21 and the lighting exclusive processing circuit unit 26 are supplied to the power switching circuit unit 23. Since the lighting exclusive processing circuit unit 26 is not mounted on the substrate 11b, the power source or the signal is not supplied to the power source switching circuit unit 23.

The power supply switching circuit unit 23 can receive a predetermined power supply from the reference power supply via the resistor r1, and can receive the lighting signal LO from the CPU 2a via the resistor r2. The power supply switching circuit unit 23 supplies power to the LED 5 built in the insertion unit of the endoscope 1A connected to the board 11b in response to the lighting signal LO.
The lighting signal LO from the CPU 2a is output according to the operation of a predetermined operation button by the user of the endoscope 1. Further, the constant current circuit unit 27 supplies a predetermined constant current to the adapter 5 based on the setting data from the CPU 2a.

  The CPU 2a determines the type of the endoscope 1 connected to the main unit 2 based on the information indicating the type of endoscope stored in the memory 6 and a predetermined constant current corresponding to the endoscope 1A. The setting data is supplied to the constant current circuit unit 27 so as to be supplied to the LED 5.

  3 is mounted on the main body device 2 and the monocular endoscope 1A is connected to the main body device 2, whereby the endoscope system 100 constitutes a monocular endoscope system.

  As described above, various circuits for driving the LEDs 5 of the monocular endoscope 1A are mounted on the circuit board 11b. Further, one or more circuit mounting areas for mounting various circuits for driving the LEDs 5 of the adapter 4 of the adapter type endoscope 1B are provided on the circuit board 11b.

  The one or more circuit mounting areas are not used when the LED 5 of the monocular endoscope 1A is driven, and various circuits used when the LED 5 of the adapter 4 of the adapter endoscope 1B is driven. It is an area for mounting.

  In the case of an adapter-type endoscope system in which an adapter-type endoscope 1B is connected to the main unit 2, one or more circuit mounting areas on the circuit board 11b are used when driving the LED 5 of the adapter 4. When the various circuits to be mounted are mounted, the circuit board 11b becomes the circuit board 11a.

  Further, at least a pair of terminal portions are provided on the circuit boards 11a and 11b, and when used in a monocular endoscope system, the pair of terminal portions C11 and C12 are connected to supply power to the LED drive circuit. Supply. Further, when driving the LED 5 of the adapter-type endoscope 1B, an LED drive circuit for driving the LED 5 of the adapter-type endoscope 1B is configured by disconnecting at least a pair of terminals. Thus, the circuit boards 11a and 11b are configured.

  FIG. 4 is a circuit diagram showing an example of the configuration of the constant current circuit 27. The constant current circuit 27 includes a digital / analog converter (hereinafter referred to as a D / A converter) 31, an operational amplifier 32, a transistor 33, and a constant current determining resistor 34. The constant current circuit 27 supplies a constant current according to the setting data from the CPU 2a to the LED 5 of the endoscope 1A or the LED 5 of the adapter 4 of the endoscope 1B.

  Setting data from the CPU 2a as a control circuit for controlling the constant current circuit 27 is input to the D / A converter 31, and the D / A converter 31 generates an analog voltage corresponding to the setting data, and generates the generated analog The voltage is output to the positive input terminal of the operational amplifier 32.

  The output of the operational amplifier 32 is supplied to the gate of the transistor 33. The collector side of the transistor 33 is connected to the power source V1 from the power source switching unit 23 via the LED 5 incorporated in the insertion portion of the endoscope 1A or the LED 5 in the adapter 4 attached to the insertion portion of the endoscope 1B. Is done. The LED 5 is connected to a resistor 5a for adapter identification in parallel.

  The emitter side of the transistor 33 is connected to the ground via a constant current determining resistor 34. The connection point C1 between the transistor 33 and the constant current determining resistor 34 is connected to the negative input terminal of the operational amplifier 32.

  The CPU 2a of the main body device 2 determines the type of the connected endoscope 1 from the contents of the memory 6, and supplies a predetermined value corresponding to the determination result as a set value to the constant current circuit 2b. In the case of an adapter type endoscope, the power source switching circuit 24 is driven to determine the type of the adapter 4.

  Therefore, for example, when it is determined that the endoscope 1 is monocular, the CPU 2a supplies a predetermined value corresponding to the monocular endoscope 1A to the constant current circuit 27 as setting data. For example, the D / A converter 11 can change the output voltage in the range of 0 to 3.3 V, and outputs a voltage corresponding to the input digital signal.

  The operational amplifier 32 generates an output voltage so that the set value becomes equal to the connection point C1, and as a result, a predetermined constant current is supplied to the LED 5 to illuminate the subject with appropriate brightness. it can.

  As described above, according to the circuit board on which the circuit for driving the light emitting element for illumination according to the present embodiment described above is mounted, it can correspond to a plurality of light emitting elements for illumination different from each other, and the cost can be reduced. It is possible to provide a light emitting element driving circuit board and an endoscope system in which the rise is suppressed.

  Furthermore, in the case of the above-described embodiment, each endoscope is equipped with a memory so that the CPU 2a can determine the type of the endoscope. Therefore, when there is a mismatch between the endoscope and the substrate, it can be determined in advance by a predetermined checking software at the time of manufacture. Further, since the constant current circuit for driving the LED uses a D / A converter, the single constant current circuit can be applied to both monocular and adapter type drive circuits. As a result, there is no need to provide the two types of constant current circuits on the substrate, which is advantageous in terms of cost and size.

  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 is a configuration diagram illustrating a configuration of an endoscope system including a plurality of endoscopes and a main body device to which any of the plurality of endoscopes can be connected according to an embodiment of the present invention. It is a block diagram of the board | substrate 11a mounted in the optical adapter type main body apparatus based on embodiment of this invention. It is a block diagram of the board | substrate 11b mounted in the monocular type main body apparatus based on embodiment of this invention. 3 is a circuit diagram showing an example of a configuration of a constant current circuit 27 according to an embodiment of the present invention. FIG.

Explanation of symbols

  1 Endoscope, 1A Monocular Endoscope, 1B Adapter Endoscope, 2 Main Unit, 2a CPU, 2b LED Drive Circuit, 3 Monitor, 4 Adapter, 5 LED, 6 Memory, 7 Connector, 11a, 11b Circuit Substrate, 21 current limiting circuit section, 22 overcurrent detection circuit section, 23, 24 power supply switching circuit section, 25 attachment / detachment detection circuit section, 26 lighting exclusive processing circuit section, 27 constant current circuit section, 21a, 22a, 24a, 25a, 26a Circuit mounting area, 100 endoscope system

Claims (7)

A substrate on which a circuit for driving the first and second light emitting elements for illumination is mounted,
A first circuit unit mounted on the substrate for driving the first light emitting element;
At least one pair of terminal portions formed on the substrate for supplying power to the first circuit portion;
A circuit mounting region provided on the substrate for mounting a second circuit unit that is not used when driving the first light emitting element and is used when driving the second light emitting element;
A circuit board for driving a light-emitting element, comprising:   The light emitting element driving circuit board according to claim 1, wherein the second circuit unit includes an attachment / detachment detection circuit for the optical adapter and a type determination circuit for the optical adapter.   2. A constant current circuit portion mounted on the substrate and supplying a predetermined constant current to each of the first light emitting element and the second light emitting element. 3. A circuit board for driving a light emitting element according to 2. A substrate on which a circuit for driving the first and second light emitting elements for illumination is mounted,
A first circuit unit mounted on the substrate for driving the first light emitting element;
When the first light-emitting element is not used when driving the second light-emitting element and is not used when driving the second light-emitting element, the first circuit is not connected and is not connected. At least one pair of terminal parts formed on the substrate for supplying power to the first circuit part, connected to drive the light emitting element of
A circuit board for driving a light-emitting element, comprising: An endoscope,
A main unit to which the endoscope is connected;
A substrate that is provided in the main body device and on which a circuit for driving the first and second light emitting elements for illumination is mounted, which is mounted on the substrate and drives the first light emitting element. The first circuit portion, at least one pair of terminal portions formed on the substrate for supplying power to the first circuit portion, and not used when driving the first light emitting element A light emitting element driving circuit board having a circuit mounting region provided on the substrate for mounting a second circuit unit used when driving the second light emitting element;
An endoscope system comprising:   The endoscope system according to claim 5, wherein the light emitting element is a light emitting element for illumination of the endoscope. The first light emitting element is built in a distal end portion of the insertion portion of the endoscope,
The endoscope system according to claim 6, wherein the second light emitting element is built in an optical adapter of the endoscope.

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