JPH0361928B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a light source device used, for example, in an endoscope.

In the case of light source devices for endoscopes, in order to adjust the appropriate light amount and color tone according to the type of body cavity to be observed, the exposure during photography, the light amount of the light source lamp, etc.
Multiple filters are provided and you can select and use them. There are also emergency lights that can be used immediately when the light source lamp burns out during use. These filters and emergency lights are arranged along the circumferential direction of a rotatable turret plate. By rotating the turret plate, necessary filters and emergency lights can be positioned on the outgoing light path.

By the way, a lead wire extends from the emergency light, so if the turret plate rotates more than once, there is a risk that the lead wire will break and cause an electric shock.

Therefore, it is conceivable to detect the pattern of the turret plate with a light-receiving element, detect the rotational position of the turret plate, and electrically control the turret plate so that it does not rotate more than one rotation.

However, in this type of system, the turret plate may easily rotate more than one revolution due to noise or failure of the position detection circuit. In other words, the reliability is poor, and the lead wire of the emergency light may break, leaving a risk of electric shock.

The present invention has been made focusing on the above circumstances,
The purpose of this is to create a light source that will prevent the turret from rotating more than one revolution even if there is noise, a failure in the position detection circuit, or a malfunction, thereby ensuring that the lead wire of the emergency light will not break and cause an electric shock. The goal is to provide equipment.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

Reference numeral 1 in FIG. 1 is a front panel of a light source device for an endoscope, and a socket 2 is provided in a part of the front panel 1 to pass through it. A connector 3 provided at the extending end of a light guide cord of an endoscope (not shown) is detachably attached to this socket 2. The light guide tube 4 protruding from the connector 3 is located on the output optical path l of the light source lamp 5, and the light condensed by the condensing lens 6 is directed to its incident end surface 4.
It's starting to be accepted by a. The above condensing lens 6
is held by a lens frame 8 attached to a fixed frame 7. Further, a circumferential portion of a disc-shaped turret 9 is interposed between the light source lamp 5 and the condenser lens 6 on the output optical path l. As shown in FIG. 2, a plurality of filters 11 having different transmission characteristics and emergency lights 12 are attached to the periphery of the turret 9 at intervals along the circumferential direction. Then, by rotating the turret 9 as described later,
Either the filters 11 or the emergency lights 12 to be used can be selected and positioned on the output optical path l. In addition, there is a reflector 1 in the emergency light 12 part.
3 are provided. Further, lead wires 15, 15 are connected to the socket portion 14 into which the emergency light 12 is attached, and the other end of each lead wire 15, 15 is led to a power supply portion (not shown). Also,
The turret 9 has a bearing 1 held on a support plate 17.
It is rotatably supported by 8. Then, it is rotationally driven by a drive motor 21 via a gear train 19. Further, the drive device for rotating the turret 9 can freely rotate in forward and reverse directions by controlling the operation of its drive motor 21, and can select any desired rotational position.

Furthermore, a receiving bar 22 that protrudes toward the fixed frame 7 is attached and fixed to the periphery of the turret 9. A stopper 23 is provided on the fixed frame 7, located on the locus along which the receiving bar 22 moves, and is made of a rising plate formed by cutting and raising a plate portion of the fixed frame 7. Therefore, no matter which direction the turret 9 is rotated, the receiving bar 22 always hits the stopper 23 after one rotation, thereby forming a stopper means for preventing further rotation. Furthermore, actuators 24a and 25a of first and second switches 24 and 25 are located on both sides of the movement locus of the receiving bar 22 with the stopper 23 in between.
3, the receiving bar 22 operates the switches 24 and 25. That is, regardless of whether the turret 9 rotates in either the left or right direction, the receiving bar 22 first operates one of the switches 24 and 25, and then hits the stopper 23.

Further, as shown in FIG. 1, a shutter blade 26 and an aperture blade 27 are provided on the output optical path l on the output side of the condensing lenses 6, 6. Each is driven by a potentiometer 29.

On the other hand, the rotational position of the turret 9 is selected by controlling the drive motor 21 by detecting the position using the following detection means. That is, as the detection means, each filter 11 is mounted on one side of the desk 31 which is fixedly attached to the rotating shaft of the turret 9.
...and an identification mark corresponding to the emergency light 12 is attached, and a mark reading detector 32 is installed opposite the desk 31, so that the desired filter 11...
Alternatively, when the emergency light 12 is located on the emission optical path l, the corresponding identification mark is read and the drive motor 21 is stopped by receiving this read signal. Furthermore, the above disk 3
1, the receiving bar 22 is connected to one of the switches 24,
A termination indication mark is attached at a position read by the mark reading detector 32 just before reaching 25, and when this termination indication mark is read, the turret 9 is rotated in the reverse direction. In other words, neither switch 24 or 25 is operated as long as it operates normally. Note that 33 in FIG. 1 is a circuit board, and this circuit board 33 and the reading detector 32 are supported by the support plate 17.

Next, the operation of the above configuration will be explained.

When the connector 3 of the endoscope is inserted into the socket 2 and the endoscope is attached, and the light source lamp 5 is turned on, the emitted light passes through one of the filters 11 on the emitted optical path l.
After passing through, it is focused by a condensing lens 6 and directed toward the ride guide tube 4. However, normally the shutter blade 2
Since the light beam 6 is closed and located on the outgoing optical path l, the light is blocked by the shutter blade 26 and does not enter the light guide tube 4. Note that the aperture blades 27 perform a predetermined narrowing down to regulate the amount of emitted light.

On the other hand, when the filters 11 are switched or the light source lamp 5 burns out, the emergency light 12 is positioned on the output optical path l. By rotating the turret 9, the selected filter 11... or emergency light 12 is positioned on the output optical path l. The turret 9 can be rotated in either forward or reverse directions to select its position.

By the way, the drive motor 21 of the mark reading detector 32 or the like may malfunction due to noise or failure, and the turret 9 may attempt to rotate more than one revolution even though it is not necessary. In such a case, the rotation is regulated as follows, and rotation of more than one rotation is prevented. That is, assuming that the switch is rotating in the direction of the solid arrow shown in FIGS. 2 and 3, the receiving bar 22 first presses against the actuator 24a of the first switch 24, and operate. The signal from the first switch 24 activates a control circuit (not shown) to cause the drive motor 21 to operate in reverse. Thus, before the receiving bar 22 hits the stopper 23, the turret 9 rotates in the opposite direction to the direction in which it has rotated up to that point. Then, normal operation may be restored, and if the abnormality remains, the second switch 2 can be turned on by turning once in the opposite direction.
Operate 5 and rotate in the opposite direction again.

Furthermore, even if the first or second switch 24, 25 is operated, if the turret 9 continues to rotate in the same direction, the receiving bar 22 will hit the stopper 23 and stop completely. Therefore, absolute safety is ensured.

As explained above, the present invention detects the end position of the turret's rotation when using a light source lamp and an emergency light held in the turret by means of a detection means, and a mark that moves as the turret rotates. A stopper means is provided to prevent the turret from rotating when the turret or its control system malfunctions due to the influence of noise and rotates beyond the predetermined rotation range of the turret, so the turret will never rotate more than one rotation. . Also, reliability of this is guaranteed. Similarly, due to the inertia of the turret, even if it rotates too much, the stopper means will prevent it from over-rotating.

Therefore, even if the turret should rotate beyond a predetermined rotation range, the lead wire of the emergency light held by the turret will not be twisted or broken. Furthermore, there is no risk of electric shock to the operator due to electrical leakage, and safety can be improved.

Furthermore, since the stopper means does not work during normal lamp replacement operations, there is no impact or other effect on the drive motor or other parts.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a side view of the main parts thereof, FIG. 2 is a front view of the turret portion thereof, and FIG. 3 is a perspective view of the rotation prevention mechanism. 5... Light source lamp, 9... Turret, 12...
...Emergency light, 15... Lead wire, 22... Receiving bar, 23... Stopper, 24... First switch, 25... Second switch, l... Output optical path.

Claims (1)

[Claims] 1. A light source lamp that emits illumination light onto an output optical path;
An emergency light having a lead wire, a rotatable turret that holds and rotates the emergency light to position the emergency light on the emission light path, a mark that moves as the turret rotates, and a mark that moves as the turret rotates. a means for detecting the position of the turret based on the read signal of the turret; and a drive device for receiving the output of the detection means and rotating the turret within a predetermined rotation range within one rotation. , a switch which is operated by the turret at a position beyond each end of the range when the rotation of the turret exceeds the predetermined range, and whose operation reversely rotates the drive device; and a switch between the turret and the fixing member. A light source device comprising: a stopper means provided between the turret and the turret for inhibiting rotation of the turret by more than one rotation beyond the operating position of the switch.