JPH02264913A - Power unit for endoscope - Google Patents

Abstract

PURPOSE:To prevent the occurrence of high voltage noise and the adverse effect to a circuit, etc., by constituting a device so that a high voltage is not applied to a lighting means when a light source lamp is not attached. CONSTITUTION:A power unit for an endoscope is provided with the light source lamp 12 attachably/detachably attached through attaching means 11a and 11b, the lighting means 14 which lights the light source lamp 12, and a control means 16 which lights the light source lamp 12 by means of the lighting means 14 only when the attachment of the light source lamp 12 is detected by detecting the presence/absence of the light source lamp 12. A detecting means 25 which detects the presence/absence of the light source lamp 12 connects a photointerrupter 34 to the attaching means 11a and 11b and detects the presence/ absence by an signal (e) outputted from the photointerrupter 34. When the light source lamp 12 is not attached, a high voltage is not applied by the lightening means 14 even if a lightening switch 18 is turned on. Therefore, the application of a high voltage does not make a noise.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a light source device for an endoscope that is configured to turn on a light source lamp only when a light source lamp is provided.

[Prior Art and Problems to be Solved by the Invention] As is well known, when observing the inside of a body cavity or lumen using an endoscope, it is necessary to illuminate the region to be observed. Therefore, the endoscope is configured to be connectable with a light source device, so that illumination light from the light source device can be guided into the body cavity via a light guide within the endoscope.

As disclosed in Japanese Patent Laid-Open No. 60-29.129, for example, a light source lamp composed of a discharge lamp such as a halogen lamp or a xenon lamp is attached to and detachable from the light source device through a means. is fixed. When the lighting switch is turned on, the control means outputs a signal to the lighting means, and the lighting means applies high voltage several times to the discharge lamp via the mounting means, so that the light source lamp is lit. It has become.

However, in such a configuration, when the lighting switch is turned on, high voltage is applied by the lighting means regardless of the presence or absence of the light source lamp.

Therefore, if the lighting switch is turned on while the light source lamp is not fixed to the mounting means, high voltage noise is generated as many times as the number of times the high voltage is applied. This high-voltage noise has the possibility of deteriorating the lighting circuit, and also reaches various parts via the signal line, causing malfunction or damage to the IC or causing the CPU to run out of control.

[Object of the Invention] The present invention has been made in view of these circumstances, and is configured so that high voltage is not applied by the lighting means when the light source lamp is not attached, thereby preventing the generation of high voltage noise. The purpose of the present invention is to provide a light source device for an endoscope.

[Means and effects for solving the problems] The light source device for an endoscope according to the present invention includes a light source lamp that is removably attached via an attachment means, a lighting means for lighting the light source lamp, and the light source. The control means detects the presence or absence of a lamp and causes the light source lamp to be turned on by the lighting means only when the presence of the light source lamp is detected.

In this configuration, when the light source lamp is attached to the mounting means, the light source lamp is lit by the lighting means, while when the light source lamp is not fixed to the mounting means, this state is The application by the lighting means is prevented by the detection by the means.

[Embodiments of the invention] Hereinafter, the present invention will be described in detail with reference to the drawings.

1 to 9 relate to a first embodiment of the present invention, in which FIG. 1 is a circuit diagram of a lighting control device, FIG. 2 is a side view of a detection device,
Figure 3 is a plan view of the photointerrupter, Figure 4 is the detection 1
Fig. 5 is a schematic diagram of the endoscope system, Fig. 6 is a perspective view of the light source lamp replacement part, Fig. 7 is a schematic diagram of the optical fQ device, and Fig. 8 is the light source device. FIG. 9 is a timing chart for explaining the operation.

To explain the outline of the system with reference to FIG. 5, reference numeral 1
is an endoscope, 2 is a light source device, and this light source device 2 includes:
For example, a video tape recorder 3a.

Peripheral devices such as a video printer 3b and a monitor 3C can be connected.

The endoscope 1 has an elongated and flexible insertion section 4 that can be inserted into a body cavity, and a large-diameter operation section 5 connected to the proximal end of the insertion section 4. At the rear end of this operating section 5 is an eyepiece section 5 to which a camera 6 can be connected.
A is provided.

Furthermore, a light guide cable 7 having a connector device 7a at its tip extends from one side of the operating section 5. The light guide cable 7 is connected to a connector receiver 2b provided on the panel 2a of the light source device 2 via a conifter device 7a.
The illumination light from the light source device 2 can be guided to the distal end 8 through the light guide provided in the insertion section 4 and irradiated to the region to be observed. ing.

As shown in FIG. 6, a lamp house 10 that is closed with an openable and closable lid body 10a is provided inside the light [tliKI2]. A certain heat sink 11a.

A light source lamp 12 fixed to 11b is disposed.

The light source lamp 12 is configured as a discharge lamp, such as a short ac clamp, which is mainly filled with inert gas, and the illumination light from the light source lamp 12 is incident on the light guide via the connector @17a. ing.

Further, the heat sinks 11a and 11b are configured to be removable via screws 13, and by loosening the screws 13, the heat sinks 11a and llb can be removed.

11b can be removed to replace the light source lamp 12.

FIG. 7 shows a schematic configuration of the light source device 2. As shown in FIG. That is, in addition to the light source lamp 12, the light source device 2 includes a lighting circuit 14, which is an example of lighting means for the light source lamp 10 and has a high voltage application circuit. A control circuit 15 and a lighting control device 16, which is an example of a control means capable of detecting the presence or absence of the light source lamp 12, are provided. Further, the panel 2a is provided with a power switch 170 and a lighting switch 18, the power switch 17 is connected to the lighting circuit 14 and the control circuit 15, and the lighting switch 18 is connected to the input end of the control circuit 15. There is.

Further, the output terminal of this control circuit 11 is connected to the lighting control device 1.
The output terminal of the lighting control device 16 is connected to the input terminal of the lighting circuit 14. Furthermore, the output end of this lighting circuit 14 is connected to heat sinks 11a and 11b.
The light source lamp 12 is connected to the light source lamp 12 fixed to the lamp 12 .

This state is shown in the block diagram of FIG. As shown in this figure, the power supply VCC is grounded through the series-connected resistor R1 and the lighting switch 18, while the voltage between the resistor R1 and the lighting switch 18 is the lIi! It is connected to an input end of a control circuit 15, and an output end of this control circuit 15 is connected to an input end of a lighting control device [16] via signal lines 19a and 19b. The output end of this lighting control device 16 is connected to the lighting circuit 14 via signal lines 10a and 10b.
A light source lamp 12 is connected to the lighting circuit 14 .

When the light source switch 17 is turned on, the lighting control device 116 detects the presence or absence of the light source lamp 16, and when the lighting switch 18 is turned on, an L signal is input to the control circuit 15.

Then, from this ldl i11 circuit 15, the lighting circuit 14
A signal (SWREG start) for activating the switch and a signal (ION) for setting the high voltage application circuit in the lighting circuit 14 are output, and the signal lines 19a and 1 are respectively output.
It is input to the lighting control device [16] via 9b.

Also, the presence or absence of the light source lamp 12 is determined by this lighting control device 1.
6, and this light source lamp 12
is fixed to the heat sinks 11a, 11b, the lighting control device 16 sends a signal (SWREG start) and a signal (IGN) via the signal lines 20a, 20b.
is output to the lighting circuit 14 and the light source lamp 12 is lit, while the light source lamp 12 is connected to the heat sinks 11a and 11b.
If not fixed, these signals will not be output to the lighting circuit 14.

In this case, it is also possible to provide an auxiliary light source lamp in the light source device M2, and to turn on the auxiliary light source lamp via the control device 15 when the light source lamp 12 is not fixed.

By the way, the lighting control device 16 is configured as shown in FIG. That is, the signal lines 19a and 19b connected to the output end of the 11111 circuit 15 are connected to the AND gate 24a and 24b via inverters 23a and 23b, respectively.
24b, and the output ends of the AND gates 24a, 24b are connected to the signal lines 20a, 20b.
is connected to the input end of the lighting circuit 14 having a high voltage application circuit.

The signal (SWREG start, IGN) output from the control circuit 15 is sent to the inverter 23a.

The AND gate 24a is inverted at 23b.

24b.

On the other hand, the other input terminals of the AND gates 24a and 24b are connected to the detection device 12 provided on the heat sink lla.
5.

This detection device M25 has a configuration as shown in FIG.

That is, the heat sinks 11a and 11b are provided with a hole 26 for fixing the light source lamp 12 in the middle thereof, and a hole 26 is provided on the outside of the heat sink 11a for fixing the light source lamp 12. 26 is formed, and a lever 29 is rotatably held in the slit 27 via a pin 28a.

A hole 29 with one side closed is provided on one side of the slit 27. This hole 29 is provided with an elastic body 30 whose one end abuts against the bottom surface of the righteous man 29 and the other end abuts against the negative side of the lever 28. The lever 28 is moved by the biasing force of the elastic body 30. It is constantly biased in the opposite direction to the hole 29.

In addition, when the lever 28 is attached, the end on the hole 26 side is rotated in the opposite direction to the hole 29, and the slit 2
The above-mentioned attachment is set as a protrusion 32 that protrudes into the hole 26 when it comes into contact with the side surface opposite to the hole 2 of 7. The protruding portion 32 has an inclined portion 32a that approaches the side wall of the hole 26 toward the side where the hole 29 is formed, and when this inclined portion 32a is pressed by the light source lamp 12, The lever 28 is rotated against the biasing force of the elastic body 3o, and when the lever 28 is rotated, the inclined af 132a is attached and protrudes in substantially the same straight line as the side wall of the hole 26. The portion 32 is installed so that it does not protrude into the hole 26.

On the other hand, one side of the lever 28 opposite to the protruding part 32 is set as a rotating part 33 extending in a direction away from the heat sink 11a, and this rotating part 33 is arranged near the heat sink 11a. photo interrupter 3
It is designed to be inserted into the slit portion 34a of No. 4.

When the inclined portion 32a is pressed by the light source lamp 12, the lever 28 resists the biasing force of the elastic body 30.
When rotated, this rotating portion 33 engages the slit portion 34.
While the heat sink 11a is moved to the innermost part of the hole 26, the heat sink 11a is attached when the light source lamp 12 is not fixed to the hole 26 and the lever 28 is rotated in the opposite direction to the hole 2 by the biasing force of the elastic body 30. , the rotating part 33 has a slit part 34a.
is configured to be moved in the direction of the opening.

A light emitting diode 35a and a phototransistor 35b are respectively disposed on both sides of the photointerrupter 34 with the slit portion 34a in between. The light emitting diode 35a and the phototransistor 35b are opposed to each other, and the rotating portion 33 is connected to the slit portion 34a.
When the light emitting diode 35a and the phototransistor 34b are rotated in the direction in which the light emitting diode 35a and the phototransistor 34b are rotated, the rotation part 33 is rotated in the direction toward the opening of the slit 34a. When the light emitting diode 35a
The phototransistor 34b is provided at a position where the cutoff between the phototransistor 34b and the phototransistor 34b is released.

The anode of the light emitting diode 35a is connected to the power supply VCC through a resistor R2, and the cathode of the light emitting diode 35a is grounded, while the collector of the phototransistor 35b is connected to the power supply VCC through a resistor R3, and the emitter is grounded. Further, the signal line 21 is connected between the phototransistor 35b and the resistor R3.
It is connected to the other input terminal of the AND gates 24a and 24b via the AND gates 24a and 24b.

Next, the operation of the embodiment with the above-described configuration will be explained.

When the lighting switch 18 is turned on, a signal (IGNW) as shown in FIG. 9(a) is input to the control circuit 15.

Correspondingly, the control circuit 15 outputs signals a and b, and these output signals a and b are applied to the inverter 2.
The signals c and d are inverted at 3a and 23b, and are input to one input terminal of AND gates 24a and 24b.

As shown in FIG. 2, the heat sink 11a is installed through the hole 26.
If the light source lamp 12 is not fixed to the lever 28, the inclined portion 32 of the lever 28 will not be pressed by the light source lamp 12, and the lever 28 will not be pressed by the elastic body 30. It is rotated about the bottle 28a by the urging force of , and is stopped when it comes into contact with one side of the slit 27 opposite to the side where the hole 29 is provided.

Further, the protruding portion 32 is protruded into the mounting hole 26, and the rotating portion 33 of the lever 28 is moved toward the opening of the slit portion 34a of the photointerrupter 34, so that the light emitting diode 35a and It is not cut off from the phototransistor 35b.

As a result, the light emitted by the light emitting diode 35a is not blocked by the rotating portion 33, and is received by the phototransistor 35b.

Then, the collector signal of this phototransistor 35b goes to the L level as shown at e in FIG. is input.

Therefore, the signals f and Q outputted from the output terminals of the AND gates 24a and 24b are always at H level regardless of the level of the signal C9d. Then, by inputting this H level signal to the lighting circuit 14, the operation of the lighting circuit 14 is not started, and the high voltage application circuit is also not activated, so that no noise is generated.

On the other hand, as shown in FIG. 4, when the light source lamp 12 is fixed to the heat sink 11a, the light source lamp 12
By pressing the inclined part 32a of the lever 29 at It is located in the department.

Therefore, light emission from the light emitting diode 35a is blocked by the rotating portion 33, and light reception by the phototransistor 35b is blocked. Then, the collector signal output from the phototransistor 35b becomes H level as shown by e in FIG. is input.

As a result, the torbel signal of the signal C2d and the torbel signal of e are input to the AND gates 24a and 24b, and the signals f and Q output from the AND gates 24a and 24b are shown in the figure. It becomes something like this.

As a result, the signals @a output from the control circuit 15,
The same signal as b will be input to the lighting circuit 14,
When the operation of the lighting circuit 14 is started, a high voltage is applied to the light source lamp 12 by a high voltage application circuit provided in the lighting circuit 14, and the light source lamp 12 is lit.

In this embodiment, a photointerrupter 34 is used as the detection means.
is used, and is configured to detect the presence or absence of the light source lamp 12 only based on the difference between H and L of the signal C output from the photointerrupter 34, so the circuit configuration is simple and the device becomes large. This has the effect of preventing this.

Further, a light-emitting member such as a light-emitting diode is provided on the panel 2a of the light source device 2, and when the light source lamp 12 is not fixed, the light-emitting member is configured to emit light according to the knockout signal of the photointerrupter 34, and the above-mentioned It is also possible to configure the system so that the operator is informed of the presence or absence of the light source lamp 12.

Furthermore, in this embodiment, the case where the photointerrupter 34 is singular has been described, but this photointerrupter 34
A plurality of control circuits 1 may be provided as necessary, and the control circuit 1
There is no need to limit the number of signal lines 19a and 19b extending from 5 to a plurality.

Further, the means for rotating the lever 28 is not limited to the elastic body 30, but the photointerrupter 34 uses gravity.
It is also possible to configure it so that it is removed from the optical path.

Furthermore, in this embodiment, rotating the lever 28,
The light emitting diode 3 is rotated by the rotating portion 33 of the lever 28.
The light emitting diode 35 is configured to block the light emission of the light emitting diode 35.
a and the phototransistor 35b are connected to the light source lamp 12.
If the light source lamp 12 is fixed, the light source lamp 12 may be configured to block the light emission from the light emitting diode 35a.

10 to 12 relate to a second embodiment of the present invention, in which FIG. 10 is a side view of the detection device, FIG. 11 is an explanatory diagram of the operating state of the detection device, and FIG. 12 is a block diagram of the optical W device. It is.

Incidentally, the same members and members having the same function as those in the first embodiment described above are given the same reference numerals, and the explanation thereof will be omitted.

In this embodiment, the detection device 2!25 of the lighting control bag Ff16 described in the first embodiment is replaced with a photointerrupter, and a switch 37 such as a microswitch is provided.

The movable contact 37a of this switch 27 is arranged to face the rotating part 33 of the lever 28, and the heat sink 11a is attached to the light source lamp 12 when the light source lamp 12 is fixed in the hole 26. When the lever 28 is rotated, the movable contact 37a is pressed, and the switch 37 is turned on.

The switch 37 connects the signal lines 19a, 19b, 20a, 20
Ij'
The signal from the m circuit 15 is transmitted to the signal lines 1.9a, 19b,
The light source lamp 12 is turned on by being inputted to the lighting circuit 16 via 20a and 20b.

On the other hand, when the light source lamp 12 is not fixed to the heat sink 11a, the lighting switch 18 is turned off by rotating the lever 22 and turning off the switch 37 in the same manner as in the first embodiment. Even if it is turned on, the lighting circuit 16 is not activated and no high voltage is applied, so there is no possibility of noise generation.

On the other hand, when the light source lamp 12 is fixed to the heat sink 118.11b, the lever 28
When the lever 28 is rotated, the rotating portion 33 of the lever 28 is rotated.
The switch 37 is turned on, and the signal lines 19a, 19b and the signal lines 20a, 20b are connected via this switch 37.

Therefore, when the lighting switch 18 is turned on, the lighting circuit 16 is activated and high voltage is applied to the light source lamp 12.

In this embodiment, since the switch 37 is configured to detect the presence or absence of the light source lamp 12, the configuration is relatively simple and easy to manufacture, and it is possible to reduce the manufacturing cost of the valve. It has the effect of being.

It should be noted that the switch 37 is not limited to a microswitch, and may be replaced with another one, such as a toggle switch or a push button switch, taking into consideration the installation space.

13 to 15 relate to a third embodiment of the present invention, in which FIG. 13 is a side view of the detection device, FIG. 14 is a circuit diagram of the lighting control device, and FIG. 15 is a timing chart for explaining the operation. It is.

In this embodiment, a hole 38 is provided on one side of the heat sinks 11a, 11b to communicate the outside of the heat sinks 118.11b with a hole 26 for attaching the light source lamp 12. A photoreflector 39 as an example of a detection device directed toward the hole 38 is disposed on the outside. Therefore, when the light source lamp 12 is installed in the hole 26, the light emitted from the light emitting diode 39a of the photoreflector 39 is reflected by the side surface of the light source lamp 12, and the phototransistor of the photoreflector 39 is 39b.

As shown in FIG. 14, the light emitting diode 39a is connected in series to the power supply Vcc via a resistor R4. On the other hand, the collectors of the phototransistors 39b are connected to the input terminals of AND gates 40 provided in the lighting control device 16, and the connections between the collectors of these phototransistors 39b and the AND gate 40 are as follows.
They are connected to the voltage m V cc via Rs and Rs, respectively.

On the other hand, the output terminal of the AND gate 40 is connected to the AND gates 24a and 24 described in the first embodiment via the signal line 21.
The AND gates 24a and 24b have an inverter 23a,
23b, 111111 circuits 15 are connected in series,
The input terminal of the control circuit 15 is a lighting switch, a switch 18 and a resistor R.
1.

With this arrangement, when the lighting switch 18 is turned on,
A signal (IGNW) as shown in FIG. 15(a) is output to the control circuit 15, and the signals a,
b is inverted into signals c and d by inverters 23a and 28b, and these inverted signals c and d are applied to AND gates 24a and 28b.
24b. (Up to this point, the operation is the same as in the first embodiment described above.) If the light source lamp 12 is not fixed to the heat sinks 11a and 11b, the light emitted by the light emitting diode 39a of the photoreflector 39 is not reflected, and therefore the phototransistor It is not incident on 39b.

As a result, the collector signals e and f of the phototransistor 39b become H level, and these H level signals e and f are input to the AND gate 40.
The signal q output from 0 becomes L level.

Therefore, the other AND gates 24a and 24b to which this signal Q and the above signals c and d are input, both output an H level signal i, which is input to the lighting circuit 16.
This lighting circuit 16 is not activated and no high voltage is applied.

On the other hand, the light source lamp 12 is not fixed accurately,
When the reflected light from the light emitting diode 39a is incident on only one phototransistor 39b, only one of the signals c and f output from the -phototransistor 39b becomes L, as shown in FIG. 15(b). The other level is 1 level, and these signals c and f are input to the AND gate 40.

As a result, the signal q output from the AND gate 40 becomes L level, and this L level signal 0 is input to the AND gates 24a and 24b, so the lighting circuit 16 is not activated due to the same effect as described above. No noise is generated.

In addition, if the light source lamp 12 and installation are accurate,
The reflected light is incident on both of the pair of phototransistors 39b.

Then, as shown in FIG. 15(C), the signals e and f output from the phototransistor 39b both become L level, and the level signals e and f are then output to the AND gate 4.
It is input to 0. As a result, an H level signal is output from the AND gate 40, and this signal q and the "C1d" level signal are input to the other AND gates 24a and 24b.

Therefore, the AND gates 24a and 24b.

Since the L level signal is output to the lighting circuit 16, the lighting circuit 16 is activated and a high voltage is applied to the light source lamp 12, so that the light source lamp 12 is lit.

In this embodiment, since the detection device 25 is provided on each heat sink 11811b, high voltage cannot be applied even when the light source lamp 12 is not fixed, or even when the light source lamp 12 is not fixed accurately. It has the effect of being able to prevent

Incidentally, the number of the photoreflectors 39 is not limited to one pair, and the number can be changed by increasing the number of photoreflectors 39 depending on the available space.

[Effects of the Invention] As explained above, according to the light source device for an endoscope of the present invention, when the light source lamp is not attached, high voltage is not applied by the lighting means, and therefore, noise is generated due to the application of this high voltage. will not occur.

Therefore, no noise will be generated even if the ignition switch is activated when the light source lamp is not installed.
The noise does not cause any adverse effects on circuits or the like.

[Brief explanation of drawings]

1 to 9 relate to a first embodiment of the present invention, in which FIG. 1 is a circuit diagram of a lighting control device, FIG. 2 is a side view of a detection device,
Fig. 3 is a plan view of the photointerrupter, Fig. 4 is an explanatory diagram of the operating state of the detection device, Fig. 5 is a schematic configuration diagram of the endoscope system, Fig. 6 is a perspective view of the light source lamp replacement section, Fig. 7 is a schematic configuration diagram of the optical a device, FIG. 8 is a block diagram of the light source device,
Figure 9 is a timing chart for explaining the operation, Figure 10 is a timing chart for explaining the operation.
10 to 12 relate to the second embodiment of the present invention, FIG. 10 is a side view of the detection device, FIG. 11 is an explanatory diagram of the operating state of the detection device, FIG. 12 is a block diagram of the light source device, and FIG. The figures to FIG. 15 relate to the third embodiment of the present invention, in which FIG. 13 is a side view of the detection device, FIG. 14 is a circuit diagram of the lighting control device, and FIG.
FIG. 5 is a timing chart for explaining the operation. 11a, 11b...Mounting means 12...Light source lamp 14...Lighting means 16...Control means 25...Detection means (O) (bl 1) -1 "Figure 1b

Claims (1)

[Claims] a light source lamp that is removably attached via an attachment means; a lighting means for lighting the light source lamp; and a lighting means for detecting the presence or absence of the light source lamp and turning on the light source lamp by the lighting means only when the presence of the light source lamp is detected. 1. A light source device for an endoscope, comprising: a control means for lighting a light source device for an endoscope.