JPH0746899Y2 - Endoscope light source device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an endoscope light source device provided with a control means for simultaneously and sequentially emitting a plurality of flash lamps.

[Prior Art] In recent years, by inserting an elongated insertion portion into a living body or a lumen, an optical image is transmitted to the eyepiece side using an observation optical system provided on the distal end side of the insertion portion, BACKGROUND ART An endoscope that can observe the inside of a living body or the like and can perform a medical treatment with a treatment tool as needed has come into wide use.

By attaching a still camera to the eyepiece of the endoscope, an optical image that can be observed with the naked eye can be photographed.

In the above-mentioned endoscope, a light guide for transmitting illumination light is generally inserted into an insertion portion, and an incident end of this light guide is connected to an (endoscope) light source device, so that the illumination light supplied from the light source device is emitted. The transmitted light is transmitted and the illumination light is emitted from the emission end toward the subject.

The conventional light source device uses a xenon discharge lamp or a halogen lamp.In order to increase the light amount when taking a picture, a light source device that uses a xenon discharge lamp increases the lamp current to increase the light amount or uses a halogen lamp. I used to add a flash lamp for photography.

For example, in the conventional example disclosed in Japanese Utility Model Publication No. 57-24334 and Japanese Utility Model Publication No. 57-24335, a plurality of strobe discharge tubes are arranged in an annular shape so as to obtain a sufficient amount of illumination light for photography.
These strobe discharge tubes are made to sequentially emit light.

[Problems to be Solved by the Invention] In the case where the amount of light is increased by increasing the current of the xenon discharge lamp, the life of the discharge lamp is shortened or a large amount of light cannot be obtained. In addition, the addition of the flash lamp to the halogen lamp requires two kinds of lighting circuits, one for the halogen lamp and one for the flash lamp, which has a disadvantage of increasing the cost.

The conventional examples of JP-B-57-24334 and JP-B-57-24335 are not suitable for ordinary observation.

The present invention has been made in view of the above points, and an object of the present invention is to provide an endoscope light source device having a relatively simple structure and capable of coping with ordinary observation and photography.

[Means and Actions for Solving Problems] In the present invention, a plurality of strobe lamps and a means for sequentially lighting the strobe lamps for normal observation and simultaneously lighting the strobe lamps for photographing are provided. By forming the light source device, it is possible to obtain an illumination light suitable for normal observation and a large amount of illumination light suitable for photography with a simple structure and low cost.

EXAMPLES The present invention will be specifically described below with reference to the drawings.

1 to 3 relate to a first embodiment of the present invention.
FIG. 1 is a configuration diagram of an endoscope apparatus including the first embodiment, FIG. 2 is a configuration diagram of a light source device of the first embodiment, and FIG. 3 is a timing chart diagram for explaining the operation of the first embodiment.

As shown in FIG. 1, an endoscope apparatus 1 having the first embodiment.
Is a fiberscope (optical endoscope) 2, a (endoscope) light source device 3 of the first embodiment that supplies illumination light to the fiberscope 2, and is attachable to the fiberscope 2 and takes a photograph. And a still camera 4 for

A light guide 9 for transmitting illumination light is inserted into an elongated insertion portion 8 of the fiberscope 2, and the light guide 9 inserted through the insertion portion 8 is a light guide cable extended from an operation portion 11 to the outside. By inserting the connector 13 provided in the end portion of the light guide cable 12 into the connector receiver of the light source device 3, illumination light is supplied from the light source device 3 to the incident end face of the light guide connector 13. It

That is, the first and second light emitting circuits 16a and 16b controlled by the light emission control circuit 15 output drive pulses to the first and second flash lamps (for example, strobe lamps) 17a and 17b, respectively.
By applying this drive pulse, the first and second flash lamps 17a and 17b each emit flash light. The flash light of each of the flash lamps 17a and 17b is applied to the incident end surface of the light guide 9 via the condenser lenses 18a and 18b, respectively.

The subject illuminated by the illumination light transmitted by the light guide 9 is the objective lens 19 attached to the tip of the insertion section 8.
Thus, an image is formed on the incident end surface of the image guide 21 arranged on the focal plane. An optical image is transmitted to the exit end face on the eyepiece 22 side by this image guide 21, and it is possible to perform visual observation through an eyepiece lens 23 provided in the eyepiece 22.

Further, by mounting the still camera 4 on the eyepiece 22, the optical image transmitted by the image guide 21 is imaged on the surface of the film 26 via the imaging lens 25 arranged so as to face the eyepiece 23. Then I can take a picture. A shutter 27 is disposed in front of the film 26, and the shutter is turned on by a release switch 28.
The film 26 can be exposed by opening 27.
The exposure amount of the film 26 is measured by the photometric element 31 through the lens 29, and when the exposure amount reaches an appropriate value, the shutter 27 is released.
I'm trying to close.

The release switch 28 is connected to the signal line 32 in the fiberscope 2 via the contact point of the eyepiece 22 and electrically connected to the light emission control circuit 15 of the light source device 3 via the contact point of the connector 13. There is. By operating the release switch 28, an illumination mode suitable for taking a picture can be set.

That is, in the case of normal visual observation, the flash lamps 17a, 17b can be set to a normal lighting mode in which the flash lamps 17a, 17b can be illuminated alternately without flicker, while in the case of photography, these flash lamps 17a, 17b can be set. Is set at the same time so that the illumination intensity is increased to allow photography with less blur. The configuration of the light source device 3 will be described below with reference to FIG.

The voltage of the power supply 41 is raised to a voltage required for lighting the flash lamps 17a, 17b by a booster circuit 42 formed by a DC-AC converter or the like. The output of the booster circuit 42 is applied to the anode and cathode of the first flash lamp 17a via the first light emitting circuit 16a formed by the diode 43a and the capacitor 44a.

Similarly, the output of the booster circuit 42 is applied to the anode and cathode of the second flash lamp 17b via the second light emitting circuit 16b formed by the diode 43b and the capacitor 44b.

On the other hand, the light emission control circuit 15 causes the pulse generator 45 to generate a reference pulse cl of 50% duty as shown in, for example, FIG. 3 (a), and to generate a first trigger pulse via the first analog switch 46. It is input to the second trigger pulse generator 47b via the second analog switch 48 and the inverter 49 as well as being input to the device 47a.

In the state shown in FIG. 2, the reference pulse cl is input to the first trigger pulse generator 47a to generate a trigger pulse a having a large amplitude as shown in FIG. 3 (b), and the first flash lamp 17a. Is applied to the trigger electrode 50a. Further, the phase of this reference pulse cl is inverted via the inverter 49 and input to the second trigger pulse generator 47b, as shown in FIG. 3 (c).
The trigger pulse b shown in is output and applied to the trigger electrode 50b of the second flash lamp 17b.

The two flash lamps 17a and 17b alternately emit flash light by application of trigger pulses a and b having mutually opposite phases,
I try to get the illumination light with little flicker.

When the release switch 28 is turned on, the "H" level connected to the power source terminal Vc via the resistor R can be set to the "L" level as shown in FIG. 3 (d). By the falling edge of, the mono multivibrator (hereinafter,
It is referred to as mono-multi. ) 51 is activated to output a pulse d as shown in FIG. By turning on the release switch 28, the first and second analog switches 46 and 48 are switched from the contact A to the contact B.

Therefore, the output pulse d of the monomulti 51 is input to the two trigger pulse generators 47a and 47b in the same phase. Therefore, the two trigger pulse generators 27a and 47b output trigger pulses as indicated by the symbols a'and b'in FIGS. 3B and 3C, and the two flash lamps 17a and 17b simultaneously. Fire a flash.

By operating the release switch 28, the shutter 27
Open and the film 26 is exposed. In this case, since the two lamps 17a and 17b are emitting light at the same time, it is possible to illuminate a large amount of light, illuminate suitable for taking a photograph, and when the appropriate exposure amount is reached, the shutter 27 is released. close.

The pulse width of the mono-multi 51 is set to an exposure time sufficient for taking a picture.

According to the first embodiment, during normal observation, the two flash lamps 17a and 17b are alternately turned on so as to be almost continuous lighting, and an illumination light amount with little flicker can be obtained.

On the other hand, in the case of taking a picture, since the flash lamps 17a and 17b can be simultaneously emitted by turning on the release switch 28, it is possible to take a picture with a proper exposure amount and less blur.

Further, since there is no mechanical moving mechanism, it is less likely to break down and can be made compact.

FIG. 4 shows a light source device 61 according to a second embodiment of the present invention. This device 61 uses three flash lamps 17a, 17b, 17c.

Three flash lamps 17a, 17b, 17c are provided at three locations on a concave surface (not shown) facing the incident end surface of the light guide 9. (The condenser lens is omitted.) A lighting voltage is applied to each flash lamp 17a, 17b, 17c from the booster circuit 42 via the lighting circuits 16a, 16b, 16c.

Each trigger electrode 50a, 50 of each flash lamp 17a ~ 17c above
The emission control circuit 62 can apply trigger pulses a, b, c or a ', b', c'to b and 50c.

The reference pulse generator 63 generates the pulse cl shown in FIG.
When applied to the input terminal of 65, the monomulti 65 outputs the pulse p1 shown in FIG. 5 (b) and the trigger pulse a shown in FIG. 5 (c) from the first trigger pulse generator 66. .

The output of the first mono-multi 65 is input to the second mono-multi 68 via the second analog switch 67, and
At the trailing edge of the monomulti 65, the pulse p2 shown in FIG. 5 (d) is output and input to the second trigger pulse generator 69, and the trigger pulse b shown in FIG. 5 (e) is output.

The output pulse p2 of the second mono-multi 68 is applied to the third mono-multi 72 via the second analog switch 71, and the pulse p3 shown in FIG. The pulse p3 is input to the third trigger pulse generator 73 to output the trigger pulse c shown in FIG.

Therefore, in the state where the analog switches 64, 67 and 71 are shown in FIG. 4, the trigger pulses a, b and c are sequentially applied to the three flash lamps 17a to 17c, and the flash lamps 17a to 17c.
The lights 17c are sequentially turned on. In this case, the illumination light supplied to the light guide 9 becomes an illumination light which is substantially constant as shown in FIG. 5 (h), and is illumination light suitable for observation.

On the other hand, means for simultaneously emitting flash light for taking a picture is formed as follows.

The release switch 28 is connected to the input end of the mono-multi 75 via a delay element 74. The release switch 28 brings the delay time down to "L" level as shown in FIG. After T, the pulse cl 'shown in FIG. 9 (j) can be output from the monomulti 75.

This pulse cl 'can be applied to the first mono-multi 65 via the first analog switch 64. Also, via the second and third analog switches 67 and 71,
Input to the third mono-multi 68,72 is also possible, and since these analog switches 64,67,71 are switched so that the contact B is turned on by the operation of the release switch 28, three trigger pulses are generated. The generators 66, 69, 73 simultaneously output trigger pulses a ', b', c'as shown in FIGS. 5 (c), (e) and (g).

Therefore, the three flash lamps 17a to 17c are simultaneously generated by the trigger pulses a ', b', c ', and the illumination light amount in this case becomes a large light amount as shown in FIG. A suitable amount of illumination light can be obtained.

In this embodiment, the delay element is operated by the release operation.
The flash circuit is temporarily stopped via 74 and the lighting circuit
The capacitors 16a-16c are fully charged. This may be applied to the first embodiment.

The number of flash lamps is not limited to two or three, and may be four or more.

[Advantages of the Invention] As described above, according to the present invention, the means for sequentially lighting a plurality of flash lamps and the means for simultaneously lighting the flash lamps are formed with a simple structure, and thus illumination for normal observation is provided. Light and illumination light for photography can be obtained.

[Brief description of drawings]

1 to 3 relate to a first embodiment of the present invention.
FIG. 4 is a configuration diagram of an endoscope apparatus including the first embodiment, FIG. 2 is a configuration diagram of a light source device of the first embodiment, FIG. 3 is a timing chart diagram for explaining the operation of the first embodiment, and FIG. FIG. 5 is a configuration diagram of the second embodiment of the present invention, and FIG. 5 is a timing chart diagram for explaining the operation of the second embodiment. 1 ... Endoscope device, 2 ... Fiberscope 3 ... Light source device, 9 ... Light guide 15 ... Emission control circuit 16a, 16b ... Emission circuit 17a, 17b ... Flash lamp 28 ... Release switch

Claims (1)

[Scope of utility model registration request] 1. A plurality of flash lamps, a light emitting circuit for causing the flash lamps to emit light, and a light emission control means for causing the plurality of flash lamps to sequentially emit light during normal observation and simultaneously emit light during photographing. A characteristic endoscope light source device.