JP3678630B2 - Light source device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a light source device that supplies illumination light to an endoscope.
[0002]
[Prior art]
As a light source device for supplying illumination light to an endoscope, a device using a discharge lamp is widely used.
In this case, the power supply that supplies power to the discharge lamp has an output circuit insulated from the casing, and generates a very high voltage between the cathode and the anode at the igniter portion when the lamp is lit.
[0003]
[Problems to be solved by the invention]
Normally, a discharge lamp is installed between the cathode and the anode, and when high voltage is applied, the discharge starts and lights up. However, when lighting fails due to deterioration of the life due to long-term use of the lamp (when the discharge lamp is not lit) If the lamp is lit without a lamp installed, it will generate dozens of high-pressure pulses in a short period of time, which is much higher than when the lamp is lit. There was a case.
[0004]
(Object of invention)
The present invention has been made in view of the above points, and prevents an adverse effect due to pulse noise at the time of high pressure generation of the igniter that occurs when the discharge lamp is not lit, and sets the state in which the discharge lamp can be replaced without any trouble by opening the replacement door. An object of the present invention is to provide a light source device that can be used.
[0005]
[Means for Solving the Problems]
In the light source device having an exchange door for exchanging the lamp,
Capacitance means for protecting the power output circuit in a supply path of a power output circuit that supplies power to the lamp;
Discharging means for discharging the charge of the capacity means in response to opening and closing of the exchange door;
By storing the pulse noise when the high pressure of the igniter that occurs when the discharge lamp is not lit is accumulated and protected by the capacity means, and by opening the replacement door, the electric charge of the capacity means is discharged by the discharge means, When the discharge lamp circuit portion is touched, the discharge lamp circuit can be set to substantially the same potential as the casing exterior.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
1 to 4 relate to the first embodiment of the present invention, FIG. 1 shows the overall configuration of the light source device of the first embodiment of the present invention, and FIG. 2 shows details of the periphery of the lamp house and the replacement door. FIG. 3 shows the configuration of the electrical system of the light source device, and FIG. 4 shows a power output circuit in the xenon power supply unit and a circuit around the igniter.
As shown in FIG. 1, the light source device 1 according to the first embodiment of the present invention has a power supply unit 3 and a lamp house 5 containing a lamp 4 disposed in the rear side inside a casing exterior 2. An air supply pump 6 is disposed at the front of the unit 3.
[0007]
Further, an optical system such as a condensing optical system 7 is disposed on the front side of the lamp 4 of the lamp house 5, that is, on the optical path of the lamp 4, and a socket 8 provided on the front surface of the housing exterior 2 in front of the optical system. An endoscope light guide connector 9 (not shown) can be detachably connected. When connected, the illumination light condensed on the end face of the light guide connector 9 can be supplied.
[0008]
The lamp 4 is fixedly held on an anode heat sink 11 and a cathode heat sink 12. The anode heat sink 11 is connected to a positive electrode 13 provided on the anode heat sink 11, and the cathode heat sink 12 is connected to a negative electrode 14 provided on the cathode heat sink 12. ing. The positive electrode 13 and the negative electrode 14 are connected to the lamp output terminal of the power supply unit 3 by a harness 15.
[0009]
The lamp unit 5 that is disposed adjacent to the power supply unit 3 and is formed of an insulating material is covered with a shield case 16 that is formed of a conductive material. The shield case 16 is electrically connected to the housing exterior 2 with a sufficiently small impedance.
On the light path on the emission side of the lamp 4, a filter 19 that cuts infrared light and the like fixed to a turret plate 18 that is rotated and positioned by a motor 17, a condensing optical system 7 that collects light, and a motor 21. A light amount adjusting diaphragm 22 whose diaphragm amount changes depending on the moving position is arranged, and a socket 8 is provided at a position where the illumination light is condensed by the condensing optical system 7.
[0010]
An intake port 23 is provided, for example, at a front position on the bottom surface of the casing exterior 2, and an exhaust port 24 is provided on the back surface. An air cooling power supply fan 25 is provided on the front surface and the back surface of the power supply unit 3. Air is sucked from the intake port 23 and blown to the back side of the power supply unit 3 to cool the power supply unit 3. The air used for air cooling is exhausted from the provided exhaust port 24.
[0011]
An air cooling fan 26 is also provided in the vicinity of the back surface of the lamp house 5. Air is sucked from the air inlet 23 and blown to the cathode heat sink 12 and the anode heat sink 11 side holding the lamp 4 for air cooling. The air used for air cooling is exhausted from an exhaust port 24 provided in the air.
[0012]
Further, an opening for exchanging the lamp 4 is provided on the side surface of the housing exterior 2 on the lamp house 5 side, and the replacement door 27 is picked so that the opening can be opened and closed with the replacement door 27. It is fixed to the casing exterior 2 with a fixing screw 28 (see FIG. 2) provided with a portion.
[0013]
An opening is provided in the shield case 16 and the lamp house 5 at a portion facing the replacement door 27, and the lamp 4 can be replaced by loosening the fixing screw 28 and removing the replacement door 27.
The shield case 16 and the lamp house 5 are also open on the front side and the back side.
[0014]
FIG. 2 shows details around the lamp house 5 and the replacement door 27. 2A shows a lower configuration of the lamp house 5, FIG. 2B shows a schematic view seen from the front side, and the right side is the lower part and the left side is the upper part.
[0015]
As shown in FIG. 2, a contact plate 31 is fixed to the bottom surface side of the lamp house 5, and this contact plate 31 is electrically connected to the positive electrode 13 through a resistor 32. A contact spring 33 is disposed below the contact plate 31 so as to face the contact plate 31, and the base side of the contact spring 33 is electrically connected to the bottom surface of the housing exterior 2 via a spring fixing member. The tip end side of the contact spring 33 extends upward.
[0016]
Between the contact plate 31 and the contact spring 33, an insulating plate 34 is slidably provided on the replacement door 27 side. For example, an end of the insulating plate 34 on the replacement door 27 side is bent into an L shape, This bent piece 34a is connected to one end of a spring 35 and is biased toward the replacement door 27 so that a force pushing the spring 35 toward the replacement door 27 is exerted.
[0017]
In this case, the replacement door 27 is provided with a protruding piece 27a whose bottom is bent into an L shape and protrudes toward the lamp house 5, and the replacement door 27 is attached to the housing exterior 2 as shown in FIG. In the state attached to the side surface, the bent piece 34a hits the protruding piece 27a, and the insulating plate 34 is restricted from moving to the outside of the side surface from the position.
[0018]
Therefore, when the replacement door 27 is removed, the bent piece 34a is released from the restriction by the protruding piece 27a, so that the bent piece 34a is moved to the replacement door 27 side as shown by a two-dot chain line in FIG. Then, the tip of the contact spring 33 is in contact with the contact plate 31 as indicated by a two-dot chain line.
[0019]
That is, the contact plate 31, the contact spring 33, and the insulating plate 34 have a role of a switch. When the insulating plate 34 is between the contact plate 31 and the contact spring 33, the switch is in an OFF state. On the other hand, when the state indicated by the two-dot chain line in FIG. 2B is reached, the switch is turned ON, and the positive electrode 13 is set in a state of being electrically connected to the housing exterior 2 via the resistor 32.
[0020]
FIG. 3 shows the configuration of the electrical system of the light source device 1.
Input power from a commercial power supply (AC power supply) is input to the interlock SW 43 via the line filter 41 and the fuse 42. The interlock SW 43 is interlocked with the opening / closing of the replacement door 27, and cuts off the supply of commercial power when the replacement door 27 is opened, and reliably stops the power supply to the power supply unit 3 when the lamp is replaced.
[0021]
The commercial power supplied via the interlock SW 43 is input to the power supply unit 3 via the power SW 44. The commercial power input to the power supply unit 3 further passes through the line filter 45 and the inrush prevention circuit 46, and then converted into direct current by the direct current circuits 47 and 48. The xenon power supply unit 49, the halogen power supply unit 50, and the control power supply unit 51, respectively. Then, DC power is supplied to the patient power supply unit 52. Each of these power supply units is housed in one case.
[0022]
The xenon power supply unit 49 is provided with an igniter 53 that generates a high-voltage pulse at the time of lighting.
The outputs of the power supply units 49, 50, 51, 52 are connected to loads according to their respective purposes, in the case of FIG. 3, the xenon lamp 4, the halogen lamp 54, the control circuit 55, and the patient circuit 56. Supply power.
[0023]
FIG. 4 shows a power supply output circuit for supplying an output for discharging and lighting the xenon lamp 4 as a discharge lamp in the xenon power supply unit 49 in the power supply unit 3 and a circuit around the igniter 53 for generating a high voltage at the time of lighting.
[0024]
Two rectifying diodes 62 are connected to the secondary side of the transformer 61 on the input side of the power supply output circuit 49, and further connected to the positive output end 64 through the choke coil 63, and between the positive output end 64 and the negative output end 65. A resistor 66 and an output capacitor 67 are connected in series.
[0025]
A resistor 68 is connected to the positive output terminal 64 and the negative output terminal 65. Further, the positive output terminal 64 is connected to the positive electrode 13 of the xenon lamp 4, the negative output terminal 65 is connected to the negative electrode 14 via an igniter 53 that generates a high voltage pulse, and a high voltage pulse voltage HV is applied at the time of lighting. The xenon lamp 4 is lit to discharge.
[0026]
The positive output terminal 64 and the negative output terminal 65 are connected to the housing exterior 2 via capacitors 69 and 70, respectively. When the lamp lighting operation is performed, when the lamp 4 is not mounted or not lit, the charge of high voltage pulse noise is quickly accumulated by the capacitors 69 and 70, and the power output circuit of the xenon power supply unit 49 is provided. Form a capacitive means to protect.
[0027]
Further, as described in FIG. 2, the positive electrode 13 is connected to the housing exterior 2 through a resistor 32, a contact plate 31, a contact spring 33, and an insulating plate 34, and opens the replacement door 27. Thus, the switch is turned from OFF to ON to quickly discharge the charge stored in the capacitors 69 and 70, and the positive output terminal 64 and the negative output terminal 65 have substantially the same potential (or trouble) as the casing exterior 2. The discharge means is formed so that there is no problem even if the user touches the xenon lamp 4 as a discharge lamp or the positive electrode 13 or the negative electrode 14 connected thereto.
[0028]
Next, the operation of this embodiment will be described.
When the endoscope light source is turned on, power is supplied from the power supply unit 3 to the lamp 4 via the harness 15, the positive electrode 13, the negative electrode 14, and the heat sinks 11 and 12. A high pressure is applied to the cathode side of the lamp 4 by the igniter 53, so that the lamp 4 is normally lit.
[0029]
Light other than visible light is removed from the lamp 4 except for visible light by the filter 19, collected by the condensing optical system 7, controlled to an optimum light amount by the light amount adjusting diaphragm 22, and applied to the end face of the light guide connector 9 of the endoscope. Incident.
[0030]
The power supply unit 3 is cooled by the air sucked from the intake port 23 in the power supply fan 25, and the warm air is exhausted from the exhaust port 24. The heat sinks 12 and 11 are cooled by the air sucked from the air inlet 23 by the lamp fan 26, and as a result, the lamp 4 is cooled. Warm air is exhausted from the exhaust port 24.
[0031]
For example, when the lamp 4 is burned out and cannot be discharged, or when the lighting operation is performed with the lamp 4 not mounted, a high voltage is applied to the electrodes 13 and 14 and the heat sinks 11 and 12. By accumulating the charges in 70, destruction of circuit elements and the like due to high-voltage pulse noise on the input side of the xenon power supply unit 49 and the like when not accumulated is protected.
[0032]
When the lamp 4 is not lit, the fixing screw 28 is removed and the replacement door 27 is removed from the housing exterior 2 in order to replace the lamp 4. The green plate 34 slides toward the outer replacement door 27 side. As a result, the contact plate 31 and the contact spring 33 are brought into conduction, and the switch of FIG. 4 is turned on.
[0033]
As a result, the electric charge accumulated in the capacitor 69 flows through the route of the igniter 53, the positive electrode 13, the resistor 32, the contact plate 31, the contact spring 33, and the housing exterior 2 and is removed.
The electric charge accumulated in the capacitor 70 is removed by flowing through the route of the resistor 68, the igniter 53, the positive electrode 13, the resistor 32, the contact plate 31, the contact spring 33, and the housing exterior 2.
[0034]
Further, the electric charge of the output capacitor 67 is spontaneously discharged through the resistor 66, and when the lamp replacement door 27 is opened and the discharge lamp circuit part to which the lamp 4 is connected is touched, the part is almost the same as the case exterior. The electric potential becomes a low voltage state, and the user can replace the lamp 4 without any trouble.
[0035]
The present embodiment has the following effects.
When the replacement door 27 is opened after the lighting operation is performed with the discharge lamp not attached or cut off, and the lamp circuit part (heat sink) is touched on the one hand and the housing exterior 2 is touched on the other hand. However, the lamp can be replaced without any trouble because of the low voltage.
[0036]
By placing the electrical contact and the switching member under the heat sink, it is possible to achieve both a discharge function and a shielding property. Moreover, since the configuration is simple, the cost can be reduced.
Further, since the configuration is simple, the reliability can be increased.
[0037]
(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 5 shows a power supply output circuit and a circuit around the igniter in the xenon power supply section 49 in the second embodiment.
[0038]
In FIG. 4, the positive output terminal 64 and the negative output terminal 65 are connected to the housing exterior 2 via capacitors 69 and 70, respectively. However, in this embodiment, as shown in FIG. The output terminal 65 is connected to the power supply chassis exterior 71 (of the power supply unit 3) via capacitors 69 and 70, respectively.
[0039]
In the present embodiment, the negative electrode 14 is arranged with the distance D to the power supply chassis exterior 71 approaching a certain value. Others are the same as those described in the first embodiment, and the same components are denoted by the same reference numerals and the description thereof is omitted.
[0040]
In the present embodiment, when the negative electrode 14 is set to the distance D close to the power supply chassis exterior 71 and the high voltage pulse generated when the lamp lighting operation is performed is not normally consumed by the lamp lighting operation, The high-voltage pulse is leaked to the power supply chassis exterior 71 side by discharge, and the leak can be set to a low voltage that does not interfere with the user's touch.
[0041]
Next, the operation of this embodiment will be described.
When a normal xenon lamp 4 is attached due to the generation of a high voltage when the lamp is lit, the high voltage pulse does not leak to the power supply chassis exterior 71 side, but when a very high voltage is generated such as when the lamp is not installed, the power supply chassis exterior 71 When the high voltage pulse leaks, the charge accumulated in the capacitor 69 and the capacitor 70 is set to a certain level or less which does not interfere with the user's touch.
[0042]
The present embodiment has the following effects.
[0043]
Even if the lamp is accidentally turned on with the discharge lamp not attached, the power supply is less likely to be damaged and the lamp can be replaced without any problem. Moreover, since the configuration is simple, the cost can be reduced. Further, since the configuration is simple, the reliability can be increased.
[0044]
Also in the present embodiment, the positive electrode 13 is connected to the power supply chassis exterior 71 via the resistor 32 and a switch comprising the contact plate 31, the contact spring 33, and the insulating plate 34, and the power supply chassis exterior 71 and the housing exterior are connected. 2 is made conductive, it has the same effect as the first embodiment.
[0045]
[Appendix]
1. In the light source device having an exchange door for replacing the lamp,
Capacitance means for protecting the power output circuit in a supply path of a power output circuit that supplies power to the lamp;
Discharging means for discharging the charge of the capacity means in response to opening and closing of the exchange door;
A light source device comprising:
[0046]
2. In a light source device having a discharge lamp and an exchange door for replacing the discharge lamp, a part of a power output circuit that supplies power to the discharge lamp and a housing exterior are connected via a capacitor and in parallel. A light source device characterized in that a circuit for short-circuiting between them is provided, an electrical contact is provided in the middle of the circuit, and the opening and closing of the electrical contact is interlocked with the opening and closing operation of the replacement door.
[0047]
3. The light source device according to claim 2, wherein the electrical contact is closed when the replacement door is opened, and the power output circuit and the housing are short-circuited.
4). The light source device according to claim 2, wherein an opening / closing member that opens and closes the electrical contact and an electrical contact are provided in a shield case that covers the discharge lamp.
5. The light source device according to claim 2, wherein a discharge resistor is provided in the short circuit.
6). The light source device according to claim 3, wherein the timing for closing the electrical contact is set before the replacement door is opened and the high-pressure part is touched.
[0048]
【The invention's effect】
As described above, according to the present invention, in the light source device including the replacement door for replacing the lamp,
Capacitance means for protecting the power output circuit in a supply path of a power output circuit that supplies power to the lamp;
Discharging means for discharging the charge of the capacity means in response to opening and closing of the exchange door;
Therefore, by accumulating and protecting the pulse noise at the time of high pressure of the igniter that occurs when the discharge lamp is not lit by the capacity means, by discharging the charge of the capacity means by the discharge means by opening the exchange door, When it comes into contact with the discharge lamp circuit portion, the discharge lamp circuit can be almost at the same potential as the casing exterior.
[Brief description of the drawings]
FIG. 1 is a diagram showing an overall configuration of a light source device according to a first embodiment of the present invention.
FIG. 2 is a diagram showing details of the vicinity of a lamp house and a replacement door.
FIG. 3 is a block diagram showing a configuration of an electric system of the light source device.
FIG. 4 is a circuit diagram around a power output circuit and an igniter in a xenon power supply unit.
FIG. 5 is a circuit diagram around a power output circuit and an igniter in a xenon power supply unit according to a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Light source device 2 ... Apparatus exterior 3 ... Power supply unit 4 ... Lamp 5 ... Lamp house 7 ... Condensing optical system 8 ... Socket 9 ... Light guide connector 11 ... Anode heat sink 12 ... Cathode heat sink 13 ... Positive electrode 14 ... Negative electrode 16 ... Shield case 27 ... Replacement door 28 ... Fixing screw 31 ... Contact plate 32 ... Resistor 33 ... Contact spring 34 ... Insulating plate 35 ... Spring 49 ... Xenon power supply 53 ... Ignators 66, 68 ... Resistance 67 ... Output capacitors 69, 70 ... Capacitor

Claims (1)

In the light source device having an exchange door for exchanging the lamp,
Capacitance means for protecting the power output circuit in a supply path of a power output circuit that supplies power to the lamp;
Discharging means for discharging the charge of the capacity means in response to opening and closing of the exchange door;
A light source device comprising:

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