JPS5897355A - Light source apparatus of endoscope - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an endoscope light source device, and particularly to an endoscope light source device using a microcomputer system.

Recently, an endoscope light source device has been developed that incorporates a computer system such as a microbup set unit to control endoscope imaging, air supply, water supply, suction, etc. According to the mirror light source device, if the CPU goes out of control due to noise or the like, control will not be performed properly.

- For example, if the OPU goes out of control when taking a still photo with automatic exposure, the aperture device of the light source will be out of control by the CPU, and the aperture may become inappropriate for still photography, that is, stopped down. Therefore, the purpose of the present invention is to provide an endoscope light source device that can take pictures with proper exposure even if the control system such as automatic exposure malfunctions. Embodiments of the present invention will be described in detail with reference to the drawings. According to FIG. 1, an endoscope 1, a light source unit 2, and an endoscope camera 3 constitute an endoscope photographing system. An endoscope 1 is provided with an image guide 5 and a light guide 6, and a subject 4 is illuminated by light guided through the light guide 6. An objective lens 2 is provided at the front end of the image guide 5, and an eyepiece lens 8 is provided at the rear end.
A camera 3 is attached to the eyepiece 9, and a beam splitter 10 of the camera 3 is arranged so that a film 11 faces the zero beam splitter 10, which faces the eyepiece 8, with a mirror shutter 12 interposed therebetween. The camera control circuit 13 is connected to a light receiving element 14 and a release switch 15 provided on the side surface of the beam splitter 10.

A signal end of camera control circuit 13 is connected to connection bin 16 . Light source unit 2 includes xenon (X@) discharge lamp 1
8 is provided, and the light guide end 19 is located on the optical axis of this lamp 18 ↓ The connector part 20 connects to the light source unit 2
connected to.

The connection terminal group 21 of the connector section 20 is connected to the light source control unit 17 via the socket of the light source unit 2. X
s The discharge lamp 18 is composed of a cathode 22 and an anode 23 and a reflective surface 24 facing each other. A condenser lens 25 is installed between the X-discharge lamp 18 and the light guide end 1#.
．． A shutter blade 26 and an aperture blade 28 are sequentially arranged. The shutter blade 26 is a shutter solenoid,
, and the aperture blades 1128 are driven by the aperture motor 29. Light guide end 19 and aperture blade 4128
A light guiding member #-1 made of, for example, an acrylic rod is disposed between the two.

The tip of the light guiding member 3 has an inclined surface facing the lamp 18, and the light receiving element 32 is disposed at the rear end. In FIG. 2, the shutter blade 26, the aperture blade 28, the light guide member 31, etc. are shown in perspective.

The JIEB diagram shows the circuit configuration of the camera control circuit 13. According to this circuit, the light receiving element 14 is connected to the integrator 31.
is connected to an operational amplifier 36. An integrating capacitor 34 and a shorting analog switch 38 are connected in parallel between the inverting input terminal and the output terminal of the operational amplifier 36. The output terminal of the integrator 37 is connected to the non-inverting input terminal of the comparator 40 (lq operational amplifier 41. The inverting input terminal of the operational amplifier 41 is connected to the D/
A. Connected to the 1-step CPU 33 via the converter 42. The output terminal of the operational amplifier 41 is a buffer circuit 4S
At the non-inverting input terminal of the operational amplifier 4r! & continued. The inverting input terminal of the buffer circuit 43 is connected to the terminal C, while the inverting input terminal of the buffer circuit 410 is grounded via a resistor 48 and connected to the output terminal via a resistor 49. Terminal d is grounded, and terminals a and b are connected to Vcc and GND, respectively.

FIG. 4 shows the main control circuit system of the endoscope light source device 2. As shown in FIG. In this circuit, CPU54, RAM55.
ROM56. Parallel interface 57, 5 I
An I A/D converter 58, a D/A converter 59, and a photographing condition input display unit 60 are interconnected by a data bus. Terminal C of terminal group 2) is connected to non-inverting input terminals of operational amplifiers 6 and 62 as comparators. Reference voltages Vr*H and Vrefj are applied to the inverting input terminals of the operational amplifiers 61 and 620, respectively.

The output terminal of the operational amplifier 62 is the serial interface 5
Connected to 7. The non-inverting input terminal of the operational amplifier 64 of the amplifier circuit ε3 is connected to the aperture potentiometer 30, and the inverting input terminal is grounded via a resistor 65 and connected to the output terminal and the terminal terminal of the A/D converter 58 via a resistor 6c. 1
connected to. The output terminal of the operational amplifier 68 of the aperture motor bi-oper 62 is connected to the base of a transistor 69, and the emitter of this transistor 69 is grounded via the aperture motor 29 and is also connected to the collector of a transistor 70.

The emitter of the transistor 69 is connected to the inverting input terminal of the operational amplifier 68 and the output terminal of the D/A converter 59 via a resistor 71. The collector of the transistor 69 and the emitter of the transistor 20 are connected via resistors 72 and 73, respectively. A voltage V- is applied. The output end of the operational amplifier 62 is connected to the base of the transistor 700 via an inverter 74. The non-inverting input terminal of the operational amplifier 77 of the amplifier circuit 76 is connected to the terminal C, the inverting input terminal is grounded via the resistor 11, and the output terminal and A/A are connected via the resistor 29.
D Connected to terminal AO of converter 58.

FIG. 5 shows the power circuit of the light source unit 2. As shown in FIG. The Xe discharge lamp 18 is connected to a high voltage generation source consisting of a high voltage generation circuit 83 and a high voltage generation coil 84. This high voltage generation source is connected to a Xe lamp current control circuit 85.
, a current detection resistor 86 and a current control transistor 87 , and a choke coil 90 . A power terminal of this rectifier circuit 89 is connected to the secondary winding of the transformer 880. The flash cable 91 is connected to a rectifier circuit 93 via a resistor 92. A power terminal of the rectifier circuit 93 is connected to the secondary winding of the transformer 940. transformer 94
The primary winding of is connected to the AC power line via a triac 95. One end of the 0 capacitor 91 connected to the triac 95 and the capacitor charging voltage control circuit 96Ilc which generates a control signal according to the charging voltage of the capacitor 91 is connected to the emitter of the transistor 97 and the transistor drive circuit 9#. The collector of transistor g2 is
e Connected to the cathode of the lamp 18 and its base connected to the drive circuit. The power supply circuit 99 is connected to A via a transformer 100.
Connected to C line.

Next, the O-camera 23, which will explain the still photography operation with reference to the time chart in FIG.
When the light source device 2 is powered on, the Xe gin 11B lights up. .

The light source aperture 28 is set on the aperture potentiometer 30 with a ↓ arrow, and narrows down the light source light according to the next aperture value. The narrowed light source light enters the light guide 19. In this state, the release button of the camera 3 is pressed, and the release switch 1
5 closes at time T1, a release signal is generated between terminals c and d of the camera 3. When this release signal is input to the comparator 62 of the light source device 2, the comparator 62
A motor driver 6 whose output is throttled through an inverter 74
The signal is input to the base of transistor 70 of No. 1, and this transistor 70 is turned on. A driving current flows through the motor 29 which throttles the throttle until this point, and the throttle 28 is opened. Also at this time CP
Under the control of U54, the light source shutter 2d is temporarily closed, the mirror shutter 12 of the camera 3 is opened at time T2, and the light source 2G is opened again. Mirror shutter 1
In synchronization with the opening of S2, the integration canister short-circuiting switch 38 of the camera 3 is opened, and the integrator S1 starts an integrating operation. At the 9th point when the mirror shutter 12 is fully opened, the CPUj4 sends "FLA8H" FLA via the interface 57.
8H" signal This "FLASH" signal energizes the transistor drive circuit 98 (FIG. 5) and drives the transistor 91.
is turned on, and the discharge current of the flash capacitor 91 is supplied to the X lamp 18. ↓In response to this, Xe lamp 18 confirms at time T3 0 camera a
) 3 integrates the output of the light receiving element 14 up to the reference voltage Vref, the output level of the buffer circuit 43 is inverted, and the "5TOP" signal is output from the comparator 61 (FIG. 4) of the light source device 2 at time 4. generated. This “5”
TOP" signal is transmitted to the shutter drive device via the OR gate 15. The shirt tarnoid 22
The 0-release switch 15, which closes the shutter 26 in response to the signal, opens at time T5, and when the mirror shutter 12 closes, the light source diaphragm 28 operates and enters the observation state. In the above photographing operation, the CP 1154 operates normally and automatically automatically Exposure control is being carried out, but the CPUJ4 goes out of control.The operation in the following case will be explained with reference to the time chart in Figure JI7.0 In this case, the release switch 15 is turned OFF.
N, and when the c-d output appears at the terminal c-d, the light source diaphragm 28 is opened in the same way as in normal times. However, at this time, the light source shutter 26 is closed and maintained in an open state due to the runaway of the CPU 54. Therefore, the light with the aperture 28 fully open, that is, the light source light that is not apertured, enters the light guide 19. Maximum light intensity of observation light is light ID 19
When the mirror shutter 12 of the camera 3 is opened, the integration operation of the integrator 32 starts, but when the mirror shutter 12 is fully opened, the integrator 37 of the camera 23 continues to emit light with the amount of light. The received light output is set to the reference voltage Vr@
Integrate by f t and convert/(When the output of the lator 41 is inverted, the signal level of the terminals e - d is inverted.
5TOP" signal is output from the comparator 61 and this "
In response to the ``5TOP'' signal, the light source shutter 26 is closed and the exposure of the film 11 is stopped.
Even if Xe lamp 1B is not flashed because Xe lamp 1B goes out of control, film J1 is automatically exposed with the maximum intensity of the observation light of Xe lamp 1B, so the exposure time will be longer, but camera 3's shirt! Film 1 with almost correct exposure within seconds
) is exposed.

In the above embodiment, the serial interface 6
7 outputs a pulse of 1 to the program, and this pulse triggers a retriggerable one-shot multivibrator 81.
5HUTTE from interface 51 to the output Q of
R'' signal is input to the AND gate 80.

Therefore, if the CPUj4 goes out of control and a pulse is not generated from the interface 67, the output Q of the retrigger pulse generator and plater 8J will be at L level, and the CPU 54 will be "
Even if the 5HUTTER'' signal is generated, the shutter 26 will not close.

In the above embodiment, the light source diaphragm is forcibly opened in response to the release operation, and the maximum amount of observation light from the light source is incident on the light guide. If the light amount is controlled, the lighting current corresponding to the maximum observation light amount may be supplied to the light source in response to the release operation. In the case of the diaphragm method, the diaphragm is opened at high speed, so it is also possible to supply a large current to the motor that throttles the shutter in response to the release operation. However, even if you use the same power supply as the L automatic light amount control in the example, the C
It is possible to open the aperture faster than by opening the aperture using PU control.

In the above explanation, the still camera 3 is attached to the eyepiece part 9 of the family celebration 1113, but a cine camera can be attached to the i-eye part 9 to take cine shots. @1 contact a
The circuit configuration of a cine camera attached to S9 is shown. According to this circuit, a control circuit 101 for controlling a cine camera is provided, and this control circuit 101 controls the gain of an amplifier circuit 102 to obtain a light reception signal suitable for automatic exposure corresponding to the A8A sensitivity of the cine film used. 0, that is, a series circuit of a resistor 105 and an analog switch 101 between the inverting input terminal and the output terminal of the operational amplifier 1040 of the amplifier circuit 102, a series circuit of a resistor 106 and an analog switch 1090, and a resistor 101. and analog switch flIO are connected in parallel, analog switches 108 to 110 are controlled to open and close by one control circuit 101 according to the A8 sensitivity of the cine film, and are connected to an operational amplifier 104 to control the output of nine light receiving elements 103. It is amplified according to the set gain. The output terminal of the amplifier circuit 102 is connected to the terminal C. In the case of cine photography, when cine auto is set by the condition setting display unit 60, cine automatic exposure photography is performed. In this case, even if the AHA sensitivity of the cine film changes, the gain of the amplifier circuit 102 of the cine camera is automatically changed by the cine control circuit 101, so that automatic exposure is performed according to the ASA sensitivity. Cine camera is endoscope 1
If the condition setting display unit is not attached to the body cavity, the brightness of the illumination inside the body cavity can be manually adjusted as appropriate by setting the condition setting display unit to manual mode. The fringe value can be adjusted accurately for the set brightness by turning the aperture potentiometer.

In addition, in the case of cine photography, since the light reception signal appears at terminals e-d, the aperture is not forcibly opened.As explained above, according to this invention, in still photography, the aperture is not forced to open in response to the release operation. We provide an endoscope light source device in which the maximum amount of observation light is guided by two light guides and can perform automatic exposure using only the observation light, so even if the computer system goes out of control and automatic exposure cannot be performed by the computer system, still photos can be taken with proper exposure. is obtained.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of an endoscopic lock photographing system using an endoscope light source device according to an embodiment of the present invention, Fig. 2 is a perspective view of the aperture and light source shutter section, and Fig. 3 is an M1 diagram. 4 is a circuit diagram of the control system of the endoscope light source device shown in FIG. 1, FIG. 5 is a circuit diagram of the power supply circuit of the endoscope light source device shown in FIG. 1, and FIG. is a time chart diagram for explaining the still shooting operation during normal operation, and Figure 7 is a CP
The next time chart explaining the still shooting operation when U runs out of control, and Figure 8 is a circuit diagram of the cine camera. 1... Endoscope, 2... Light source device, 3... Camera,
5... Image guide, 6... Light guide, 13
...Camera control circuit, 14. ...light receiving element, 15.
...Release switch, 11...Light source control circuit, 18
...Xe discharge lamp, 19...light guide end, 26°°°shutter blade, 21...shutter tray
Noid, 2#... throttle, 29... throttle motor, 30
...Aperture potentiometer, 33...CPU, 37
... Integrator, 10... Condition setting display unit, 67
...A motor driver that throttles. Applicant's agent Patent attorney - Takehiko Suzue ff13 Figure 4 ref 1 Figure 6 T1 D2 T4
T6Figure 7TI T2 T4
T6 Figure 8 Haruki Shimada, Commissioner of the Patent Office, 1, Indication of the case, Patent Application No. 56-194757, 2, Name of the invention, Endoscope light source device 3, Person making the correction, Relationship to the case, Patent applicant (037) Olympus Optical Kogyo Co., Ltd. 4, Agent 6, Amendment subject Kazuo Wakasugi, Commissioner of the Patent Office 1, Indication of the case II #Pengsho 56-194757 No. 2 Threatening name Endoscope light mat 3, Person making the amendment Case Relationship with Patent applicant (037) Orinnosu Optical Industry Co., Ltd. 4, Agent 6, Specification subject to amendment 1 Drawing 7, Contents of amendment (1) Page 5, line 19 of the attached specification of the 1m document Correct the text "output terminal" to "output terminal". (2) In the 6th line of page 6, the rsss A/D converter 511J is corrected to ``rA/D converter sa''. (3) On page 6, lines 13 and 14, the words ``serial interface 51'' are corrected to ``the parallel interface 57''. (4) On page 7, line 15 of the same page, ``Terminal AOJ'' is corrected as [terminal AyJ. (5) On page 8, line 10 of the same page, ``TRIAC 96. ” he corrected. (6) Page 8, line 20, “I will explain...”
``First, if CPUJ 4 is operating normally'' is added after ``. (71, 1112j [lK, line 11, 1:, r&!J full-inter'' is corrected to ``)rulerinter''. (8) In page 12, line 15 of the same, ``to output Q'' is corrected. Correct it to "output Q". (9) iii On page 13, line 20, "Figure 4" is corrected to "Figure 8I! i1J.

Claims (4)

[Claims] (1) A light source that generates light that illuminates a subject through a light guide of an endoscope, a dimming means that dims the light incident on the light guide, and a dimming signal is input to the dimming means. A main control circuit, which controls the light control means to a maximum observation light amount in response to a release operation of a still camera attached to the endoscope, and transmits a voice light control signal independently from the main control circuit to the light control means. An endoscope light source device comprising a dimming control circuit for still photography. (2) The light control means includes an aperture device that adjusts the amount of light incident on the light guide, and the still photography light control circuit controls the aperture device in response to a release operation of the still camera. An endoscope light source device 0 according to claim S, which is constructed by means (3) The light adjustment means is comprised of means for adjusting the amount of light emitted from the light source, and the still photography light adjustment control circuit is comprised of means for causing the light source to fully emit light in response to the release operation. An endoscope light source device according to claim 1. (4) The main control circuit is configured as a micro-pulse centimeter system that performs at least automatic exposure control and signal transmission control (D@enclosure) Device.