JP4283451B2 - Endoscope light source device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endoscope light source device.
[0002]
[Prior art]
Conventionally, a xenon lamp, a halogen lamp, a metal halide lamp, or the like is used as a light source for irradiating an observation object with illumination light in a light source device to which a fiberscope is connected. Usually, the patient's body is illuminated by the light emitted from these lamps (hereinafter, the main lamp), and observation with an endoscope becomes possible. Further, the light source device is provided with a sub lamp as an emergency lamp in case the main lamp becomes inoperable due to a lifetime or is cut off during the operation of the fiberscope. If you insert the fiberscope into the patient's body and the main lamp stops operating while observing the affected area, you will not be able to obtain an image inside the body. Because it is dangerous. As the sub lamp, a tungsten lamp that can be lit with a low DC voltage (direct current voltage) is usually used.
[0003]
[Problems to be solved by the invention]
However, the provision of two illumination means, a main lamp that is usually used as a light source and a sub lamp that is used as an emergency light, increases the manufacturing cost of the light source device and the like, and increases the size of the light source device and the like. There is a problem. Moreover, the filament of the tungsten lamp prepared as a sub lamp may break unexpectedly. Further, power is supplied from a commercial power source to these main lamp and sub lamp. Therefore, when the power supply from the commercial power supply is stopped due to a power failure or the DC power supply unit inside the light source device is damaged, there is a problem that not only the main lamp but also the sub lamp is not lit. That is, there is a problem that the conventional secondary lamp lacks reliability as an emergency lamp.
[0004]
The present invention solves the above problems, and includes an illuminating means that can be operated not only during normal power supply but also when power supply from a commercial power supply is stopped due to an external factor. The purpose is to provide an endoscope.
[0005]
[Means for Solving the Problems]
An endoscope light source device according to the present invention includes a light source having a plurality of semiconductor light emitting elements, a driving circuit that supplies a driving current to the semiconductor light emitting elements, a voltage applying unit that applies a DC voltage to the light source and the driving circuit, Charging means for charging the secondary battery with the DC voltage applied by the voltage applying means, and when the application of the DC voltage from the voltage applying means is stopped, the DC voltage is applied from the secondary battery to the light source and the drive circuit. It is characterized by that.
[0006]
Preferably, the charging means and the secondary battery are connected via a resistor, the drive circuit is connected to the voltage applying means via the charging means and connected to the secondary battery, and the plurality of semiconductor light emitting elements are two or more. The semiconductor light-emitting elements are configured as at least one semiconductor light-emitting element group connected in series, and the anode terminal side of the semiconductor light-emitting element group is connected to the voltage application means through the charging circuit and connected to the secondary battery, The cathode terminal side of the semiconductor light emitting element group is connected to the drive circuit via the semiconductor element.
[0007]
An endoscope light source device according to the present invention includes a light source having a plurality of semiconductor light emitting elements, power supply means for supplying power to the light source, and power supplied from the power supply means to the light source. A secondary battery charged by the supply means, and a power supply switching means for supplying power from the secondary battery to the light source when power supply from the power supply means to the light source is stopped are provided.
[0008]
According to the present invention, the plurality of semiconductor light emitting elements function as a light source both when a DC voltage is applied from the voltage applying means and when the application from the voltage applying means is interrupted as during a power failure. In other words, since one light source having a plurality of semiconductor light emitting elements can be used as an emergency light, the number of parts is reduced. Therefore, the manufacturing cost is reduced and the entire apparatus can be downsized.
[0009]
In addition, since the switching of the power supply source to the secondary battery is automatically performed depending on the circuit configuration, the operator is not burdened with a switch operation or the like for switching.
[0010]
By connecting the charging unit and the secondary battery via a resistor, a predetermined potential difference is generated between the secondary battery and the charging unit, and self-discharge of the secondary battery is prevented.
[0011]
In addition, according to the present invention, since a plurality of light emitting elements are provided as a light source, even if some of the light emitting elements fail and no light is emitted, the entire light source is not hindered.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an external view of a light source device to which an embodiment according to the present invention is applied. A main switch (main SW) 11 is provided on the front surface of the light source device 10. Supplying and stopping power from the commercial power source to the light source device 10 are performed by pressing the main SW 11 and performing an on / off operation. A lamp switch (lamp SW) 12 is provided in the vicinity of the main SW 11. By pressing the lamp SW12 and performing an on / off operation, the lamp unit described later is turned on and off. A panel sheet 13 is provided above the main SW 11 and the lamp SW 12. The panel sheet 13 is provided with various button switches and indicator lights. An UP button switch (UP button SW) 131 and a DOWN button switch (DOWN button SW) 132 are button switches for adjusting the amount of illumination light. The illuminance of the illumination light determined by operating these button switches is the light amount. Displayed by the level display unit 133. In addition, a fiberscope connection base 14 is provided on the left side of the front surface, and a light guide insertion port 15 is formed in the approximate center thereof.
[0013]
FIG. 2 is a block diagram of the endoscope system of the present embodiment, showing a state where the fiberscope 20 is connected to the light source device 10. The power supply 100 for the control circuit of the light source device 10 is connected to a commercial power supply (not shown) via the main SW 11. By appropriately pressing the main SW 11, power supply from the commercial power source to the control circuit power source 100 is started and stopped. A system controller 101 is connected to the control circuit power supply 100. The system controller 101 is a microcomputer that controls the light source device 10 as a whole. That is, the system controller 101 is a central processing unit (CPU), a program for executing various routines, a read only memory (ROM) for storing constants, etc., and a writable / readable memory (temporarily storing data). RAM).
[0014]
Further, a charging unit 102 is connected to the control circuit power supply 100, and an LED drive circuit 103 is connected to the charging unit 102 via a lamp SW12. A lamp unit 104 that is a light source unit is connected to the LED drive circuit 103. The configuration of the lamp unit 104 will be described later.
[0015]
The fiberscope 20 includes an insertion portion 21 that is a flexible conduit, and a light guide / fiber bundle (light guide) 22 is inserted through the insertion portion 21. When the fiberscope 20 is connected to the light source device 10, the incident end of the light guide 22 is optically connected to a lamp unit 104 provided in the light source device 10. Light emitted from the lamp unit 104 enters the incident end of the light guide 22 via the aperture mechanism 105. The light beam incident on the incident end of the light guide 22 is guided to the distal end of the insertion portion 21 by the light guide 22 and is irradiated onto the object to be observed through a light distribution optical system (not shown). Further, an image guide fiber bundle (image guide) 23 is inserted into the insertion portion 21. The reflected light from the object to be observed passes through an objective optical system (not shown) provided at the distal end of the insertion portion 21 to the eyepiece optical system 25 provided in the eyepiece portion 24 of the fiberscope 20 by the image guide 23. Led.
[0016]
The aperture mechanism 105 is connected to the system controller 101. In response to the operation of the UP button SW131 or DOWN button SW132 (see FIG. 1) of the panel sheet 13 described above, a control signal is output from the system controller 101 to the diaphragm mechanism 105, and the diaphragm mechanism 105 is driven. That is, when the UP button SW131 is pressed, the amount of light emitted from the lamp unit 104 and incident on the incident end of the light guide 22 increases, and when the DOWN button SW132 is pressed, the light guide 22 of the emitted light from the lamp unit 105 is input to the light guide 22. The diaphragm mechanism 105 is driven so that the amount of incident light flux is reduced. Under the control of the system controller 101, the display element of the light amount level display unit 133 (see FIG. 1) is turned on according to the increase or decrease of the light amount controlled by the diaphragm mechanism 105.
[0017]
3 is a front view showing the lamp unit 104 from the side facing the incident end of the light guide 22, and FIG. 4 is a diagram schematically showing the relative positional relationship between the lamp unit 104 and the light guide 22 from the side. The attachment portion 140A of the holding member 140 is formed in a parabolic shape. A plurality of LED chips 141 that emit white light are arranged concentrically around the central axis C of the mounting portion 140A in the mounting portion 140A. In FIG. 4, the holding member 140 has a cross section cut along a plane including the central axis of the mounting portion 140 </ b> A, and the LED chip 141 and the above-described aperture mechanism 105 are omitted to avoid complication of the drawing.
[0018]
The light guide 22 and the holding member 140 are arranged such that the center of the incident end face 22A of the light guide 22 is positioned on the central axis C of the mounting portion 140A. Further, in the state in which the light guide 22 and the holding member 140 are arranged in this way, an angle formed by the optical axis OP of the emitted light of the LED chip 141 provided on the peripheral portion of the mounting portion 140A and the central axis C of the mounting portion 140A. The attachment portion 140A is formed so that α is about 30 degrees. By adopting the above configuration, the white light emitted from each LED chip 141 is condensed on the incident end face 22A of the light guide 22, and the emitted light of the LED chip 141 is efficiently used.
[0019]
FIG. 5 is a block diagram showing a circuit configuration for driving the lamp unit 104. As described above, the control circuit power supply 100 is connected to the commercial power supply via the main SW 11, and when the main SW 11 is pushed and turned on, the AC voltage supplied from the commercial power supply is AC / DC in the control circuit power supply 100. After being converted, a predetermined DC voltage is applied to the charging unit 102 and the lamp unit 104. When a DC voltage is applied to the charging unit 102, power can be supplied to the LED drive circuit 103 via the charging unit 102 and the lamp SW12. When the lamp SW12 is pressed and turned on, the LED drive circuit 103 drives the lamp unit 104. That is, power is supplied to the lamp unit 104 from the control circuit power supply 100 via the power supply line PL, and LED driving for driving the LED chip 141 (see FIG. 3) of the lamp unit 104 from the LED drive circuit 103 is performed. Current is supplied.
[0020]
The charging unit 102 includes a charging circuit 150 and a secondary battery 151. FIG. 6 is a circuit configuration diagram of the charging unit 102. The charging circuit 150 and the LED drive circuit 103 are connected via a diode D1. Under normal conditions, when a DC voltage is applied from the control circuit power supply 100 to the charging circuit 150, power is supplied to the LED drive circuit 103 via the diode D1.
[0021]
In addition, the secondary battery 151 is connected to the charging circuit 150 via the diode D1 and the resistor R1, and power is supplied to the LED drive circuit 103 and the secondary battery 151 is charged at a constant voltage by the charging circuit 150. Is done. Since the resistor R1 is interposed, a predetermined potential difference is generated between the charging circuit 150 and the secondary battery 151, and as a result, the current is prevented from flowing backward from the secondary battery 151 to the charging circuit 150. That is, the self-discharge of the secondary battery 150 is prevented by the resistor R1. When the supply of DC voltage is stopped due to the stop of power supply from the commercial power supply due to a power failure or the failure of the control circuit power supply 100, and the supply of power from the charging circuit 150 to the LED drive circuit 103 is stopped, the lamp SW12 is pushed. In a state determined to be on, power is automatically supplied from the secondary battery 151 to the LED drive circuit 103 via the diode D2.
[0022]
FIG. 7 is a diagram showing a circuit configuration of the lamp unit 104 and the LED drive circuit 103. The lamp unit 104 includes, for example, three sets of LED chip groups 142. In each LED chip group 142, two or more LED chips 141 are connected in series. Note that the number of LED chip groups is not limited to three. That is, the number of LED chip groups 142 and the number of LED chips 141 constituting each LED chip group 142 are determined according to the number of LED chips 141 disposed at the distal end portion of the endoscope.
[0023]
As described above, power is supplied from the control circuit power supply 100 to the power supply line PL connected to the anode side of each LED chip group, and power is supplied from the secondary battery 151 in an emergency such as a power failure. The That is, predetermined power is always supplied to the power supply line PL. The cathode side of each LED chip group is connected to the collector terminal of a bipolar transistor 160. The drive line DL is individually connected to the base terminal of each transistor 160, and the charging unit 102 (see FIG. 5) is connected to the drive line DL via the lamp SW12. Therefore, the base drive current of the transistor 160 supplied from the LED drive circuit 103 and supplied to the drive line DL is supplied to the base terminal or stopped from being supplied depending on the on / off state of the lamp SW12. The emitter terminal of the transistor 160 is grounded via a resistor 161R having a predetermined resistance value that defines the LED drive current. As described above, if each LED chip group in which two or more LED chips 141 are connected in series is driven individually, for example, even if one LED chip 141 in a certain LED chip group is broken, Even if the LED drive current supply to the LED chip group is cut off, white light is emitted from the other LED chip groups, so that the possibility that the illumination light is cut off completely becomes extremely low. However, all LED chips 141 may be connected in series to form a single LED chip group. In this case, the number of components such as transistors may be small.
[0024]
When the lamp SW12 is pushed and turned on and a current having a predetermined current value is supplied to the base terminal of the transistor 160, the transistor 160 becomes active, a collector current is supplied to each LED chip 141 as an LED driving current, and the LED chip 141. From which white light is emitted. When the lamp SW12 is pushed and turned off and the application of voltage to the base terminal is stopped, the transistor 160 becomes inactive and the emission of white light from the LED chip 141 is stopped.
[0025]
In the event of an emergency such as a power failure or failure of the control circuit power supply 100, the application of the DC voltage from the control circuit power supply 100 is cut off and the system controller 101 does not operate. However, according to the present embodiment, when the power supply from the control circuit power supply 100 is stopped, the power to the LED chip 141 of the LED drive circuit 103 and the lamp unit 104 in a state where the lamp SW12 is pressed and determined to be on. Supply is performed from a charged secondary battery 151. That is, the power supply is automatically switched and the system controller 101 is not involved. Therefore, even if an emergency such as a power failure or a failure of the control circuit power supply 100 occurs, the illumination light continues to be irradiated from the distal end of the insertion portion 21 of the fiberscope 20, and the operation of extracting the insertion portion 21 from the patient's body is safe. To be done.
[0026]
Further, if the rechargeable battery 151 is charged in advance, illumination light can be irradiated even in a situation where a commercial power source cannot be obtained, and observation with the fiber scope 20 can be performed.
[0027]
【The invention's effect】
As described above, according to the present invention, it is possible to irradiate illumination light without performing a special operation even when power supply from a commercial power source cannot be obtained due to a power failure or the like, and observation with a fiberscope is possible. Become.
[Brief description of the drawings]
FIG. 1 is an external view of a light source device of an endoscope system to which a first embodiment of the present invention is applied.
FIG. 2 is a block diagram of the endoscope system according to the first embodiment.
FIG. 3 is a diagram schematically showing the arrangement of LED chips in a lamp unit.
FIG. 4 is a diagram schematically showing a relative positional relationship between a light guide and a lamp unit from a side surface.
FIG. 5 is a diagram showing a circuit configuration of a power supply system in the light source device.
FIG. 6 is a diagram showing a circuit configuration for switching the power supply of the lamp unit.
FIG. 7 is a diagram illustrating a circuit configuration of a lamp unit.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Light source device 11 Main switch 12 Lamp switch 20 Fiberscope 22 Light guide 23 Image guide 100 Power supply 101 for control circuits System controller 102 Charging unit 103 LED drive circuit 104 Lamp unit 105 Aperture mechanism 141 LED chip 150 Charging circuit 151 Secondary battery

Claims (2)

A light source having a plurality of semiconductor light emitting elements;
A light emission operation means operated by a user to turn on and off the light source;
A drive circuit for supplying a drive current to the semiconductor light emitting device;
Voltage application means for applying a DC voltage to the light source and the drive circuit;
Charging means for charging a secondary battery with a DC voltage applied by the voltage applying means,
When the drive circuit is connected in parallel to the voltage application unit and the charging unit via the light emission operation unit, and the application of the DC voltage from the voltage application unit stops, the light emission operation unit is When the light source is turned on by operation, a DC voltage is applied from the secondary battery to the light source and the drive circuit, and when the light emission operation unit is turned off by a user operation, the second light source is turned on. A light source device for an endoscope, wherein a DC voltage is applied to the light source from a secondary battery, and no DC voltage is applied to the drive circuit from the secondary battery. The charging means and the secondary battery are connected via a resistor between the light emission operation means and the secondary battery ,
The drive circuit is connected to the voltage application means via the charging means and to the secondary battery,
The plurality of semiconductor light emitting elements are configured as at least one semiconductor light emitting element group in which two or more semiconductor light emitting elements are connected in series,
The anode terminal side of the semiconductor light emitting element group is connected to the voltage application means via the charging circuit and to the secondary battery,
The light source device for an endoscope according to claim 1, wherein a cathode terminal side of the semiconductor light emitting element group is connected to the drive circuit.

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