JPS5894829A - 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 that can adjust the brightness of observation light.

An endoscope light source device is generally configured to generate observation light and photographing light, and the brightness of the observation light can be changed arbitrarily. With conventional endoscope light source devices, the observation light does not reach the set brightness due to power supply voltage fluctuations, rung variations, misalignment, or lamp deterioration due to long-term use. Alternatively, flickering may occur, causing inconvenience to the user during endoscopic observation.

Therefore, an object of the present invention is to provide an endoscope light source device that can consistently obtain observation light of a set brightness.

The present invention will be described in detail below with reference to the following. According to FIG. 1, an endoscope 1, a light source device (light source unit) z, and an endoscopic camera 23 constitute an endoscopic photographing system. $2 As shown in the figure, the endoscope 1 has an image guide 5.
A light guide 6 is provided, and the subject 4 is illuminated by the light guided through the light guide 6. An objective lens 7 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, and a beam ray 10 of the camera 3 faces a GTC eye lens 8.

A film 11 is disposed opposite to a beam splitter 10 with a mirror mirror 12 interposed therebetween.

The camera control circuit 13 is connected to a light receiving element 14 and a release switch 16 provided on the front surface of the beam sinter 10. The signal end of the camera control circuit IJ is the connection terminal group 16
connected to. The light source unit 2 is provided with a xenon (X.) discharge rung 18, and the connector portion 20 is connected to the light source unit 2 so that the light guide end 19 is located on the optical axis of the lamp 180. The connection terminal group 21 of the connector section 20 is connected to the light source control unit 17 via the light source unit 20 socket. The Xe discharge rung 18 is composed of a cathode 22 and an anode 23 facing each other, and a reflecting surface 24. A condenser lens 25, a shutter blade 26, and an aperture blade 28 are sequentially arranged between the Xe discharge rung 18 and the light guide end 19. The shutter blades 26 are driven by a shutter and tanlenoid 27, and the diaphragm blades 28 are driven by a diaphragm motor 29. A light guide member 31 made of, for example, an acrylic rod is disposed between the light guide end 19 and the aperture blade 2g. The tip end of the light guiding member 31 has a sloped surface 7f18@, and a light receiving element 32 is disposed at the rear end. In Figure 3, the shutter blade 26. Choke feather 28
, the light guide member 31, etc. are shown perspectively.

FIG. 4 shows the circuit configuration of the camera control circuit 130. According to this circuit, the light receiving element 14 is connected to an operational amplifier 36 of an integrator/current/voltage converter 37. An integral carrier/transducer 34 is connected between the inverting input terminal and the output terminal of the operational amplifier 36.
and a current-voltage conversion resistor 35 are connected in series. Short-circuit analog switches 3a and 39 are connected to the integral carrier, p4 switch 38, and resistor 35, respectively. The output end of the integrator/current-voltage converter 31 is connected to the non-inverting input end of the operational amplifier 41 of the converter converter 40 .

The inverting input terminal of the operational amplifier f42 is connected to the CPU SjK via the D/mu converter 42.

The output terminal of the operational amplifier 41 is connected to the non-inverting input terminal of the operational amplifier 41 of the buffer circuit 911t43 via the analog switch 44. In addition, the non-inverting input terminal of this operational amplifier 47 is connected to the operational amplifier 36 via an analog switch 4j.
connected to the output end of the Anasonda switch 44 and 4s
is opened and closed by the output signal of CPU x s, and the analog switch 45 is controlled by the signal via the inverter f-)4gl. The inverting input terminal of the operational amplifier 41 is grounded via a resistor 48 and connected to an output terminal via a resistor 49.

The output end of this buffer circuit 43 is connected after the terminal sK.

Terminal f is grounded, and terminals a and b are connected to vcc and GND, respectively. Terminals C and d are connected to the CPU 33 via a serial interface set. CPU j
3 is inverter 51° light emitting diode (LED)
j 2 and resistor 53 to vcc.

FIG. 5 shows the circuit configuration of the light source control circuit 17 of the light source unit 2. As shown in FIG. In this circuit, terminals C and d
is connected to serial interface 54. The serial interface 54 connects the CPU 5s via a path.
, ROM 56, RAM 5 r, A/D code 7 hafi
58 e D/A controller 7 part 59, condition setting/display unit 60 and motherboard interface 7. Connected to Ace 61. The terminal e is connected to the non-inverting input terminals of the low-amplification amplifier circuit 62 and the high-amplification amplifier circuit 63. The inverting input terminal of the operational amplifier 64 is connected to the resistor #5.
It is grounded via the feedback resistor 6if and connected to the output terminal via the feedback resistor 6if. Similarly, resistors 68 and 69 are connected to the inverting input terminal of the operational amplifier 610. The output terminal of the amplifier circuit 62 is connected to the non-inverting input terminal of the converter 70.

The output terminal of the comparator 10 is connected to the @CIARGE' terminal of the Δ parallel interface 7/8 61. The current-voltage converter rsil, which is connected to the light-receiving element 32, is composed of an operational amplifier 16 and a resistor 11. The output terminal of the D/A converter 69 is connected to the inverting input terminal of the operational amplifier 9 of the diaphragm 9 driver 18, and is also connected to the emitter of transistor #2 and the diaphragm motor 29 via a resistor 80.

The collector of the transistor 82 is connected to V through the resistor 81, and the conductor is connected to the output terminal of the amplifier 11.

As shown in FIG. 6, the brightness display 111 provided in the light source unit 2 is constituted by an array of a plurality of (eight in this embodiment) light emitting diodes (LEDs) and is designed to display a pergraph.

The anode of the display 131 is connected to the power supply VccK through a resistor, and the cathode is connected to the condition setting/display unit through an amplification.
Toro 0's Peripheral 7 Elal Programmer Inter 7 Ace (Ppri J 44's Port) Connected to the PC. Ming Sui, Chi 131. Dark Sui, Chi139. Steel A-M changeover switch 142 and Cine A-M changeover switch 143 are set to P.
P1144 port) Connected to Pb. Additionally, a steel A8A setting switch 140 and a cine ASA setting switch 141 are connected to I-P& of PPI J 44.

FIG. 7 shows the power circuit of light source 22, 2. The X-discharge line f18 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 source is Ha-Ran! Current control circuit 85. It is connected to a rectifier circuit 89 via an X-lung current control section composed of a current detection resistor 86 and a current control transistor 81 and a choke coil 90 . The power supply terminal of this rectifier circuit 89 is connected to the secondary winding line of the transformer 88. The fluge and canister insulator 91 is connected to a rectifier circuit 93 via a resistor 92.

'The power terminal of the MR circuit 93 is connected to the secondary winding of the transformer 94. The primary winding of the transformer 94 is a triac 9
It is connected to the AC power line through 5t. The triac 95 is connected to a canoccictor charging voltage control circuit 96 that generates a control signal according to the charging voltage of the capacitor 91. One end of the canopy shield 91 is connected to the emitter of the transistor 91 and the transistor drive circuit 98.
connected to.

The collector of transistor 91 is connected to the cathode of X-rung 18, and the conductor of transistor 91 is connected to the drive circuit.

Power supply circuit 99 is connected to the AC line via transformer 100f.

In the above-mentioned circuit, the A/D converter 58 has a built-in multiplexer and can output a 98-bit digital signal.
8 is used. This ADC0808 has 8 channels of analog input and 8 bits of digital output, but in the embodiment, only 4 channels of analog input A to A are used. The human power A@v AHv and A are connected to the outputs of the amplifier circuits 62, 63 and the current-voltage converter 15, respectively. If the CPU 55 uses Intel's 8085e, the serial interface 54 uses an 8251A from Intel's 8085e family and is connected to the camera 3 as a UART. The ROM 56 is selected according to the program capacity, and if it has a capacity of 2/4 bytes, the family 27161r is used. Also, RAM 5F is 211
4t-Used.

The D/A converter 59 is used to convert 8-pit digital data into analog data, specifically, N
8 company 0DAC1008 is used.・This is CPU 55
It has the advantage of being directly connected to the data bus. Furthermore, this D/
Since the analog output of the A converter 59 is a current output, it is converted into a voltage by the aperture driver 78. Also, A/D
The converter 68 has an 8-bit resolution f: substantially 16 bits. Condition setting/display 22. Shooting still film sensitivity.

It is possible to set cine film (TV) sensitivity, still/cine correction during auto shooting, auto/manual switching for still, auto/manual switching for cine, and manual light intensity setting for cine. /The analogous interface 61 is Intel's 7 milii 825.
Use 5A.

Next, the operation of the above-mentioned endoscope system will be explained.

As shown in FIG. 1, when the connector 20 of the endoscope 1 is connected to the light source unit 2 and the 11 source switch 145 is turned ON, the Xs discharge lamp 18 is lit. It is detected by the light receiving element 32 via the optical member 3.The light receiving element 32d converts the light source light into an electrical signal according to the brightness, that is, a light receiving signal.The light receiving signal is amplified by the current voltage converter 75 and converted into a voltage signal. is converted into and input to terminal A3 of the A/D converter 58.CPU
55 measures the brightness of the light source based on the digital light reception signal from the A/D converter 58. Just to be sure, the CPU 55 checks that the X@discharge rung 18 is lit at 100% brightness. In this state, the cine A-M changeover switch 143 is set to manual, and for example, when the dark switch 139 is pressed, the up/down counter of the PPI 144 counts down and the count information is sent to the CPU 5.
5 is input. The CPU 55 controls the LED'! of the brightness display 137 to correspond to the count information. I-The lights go out one by one. The brightness display 137 is configured to display, for example, eight levels depending on the brightness. That is,
Brightness is practically 10 from 100 lights on to 0 lights off
The range from 0 to 20 is divided into 8 stages and displayed in 8 stages. For example, if the dark switch 139
When set to light, the CPU 55 controls the aperture driver 78 while monitoring the light received by the light receiving element 32 so that the brightness reaches the set value of 80. Aperture driver 78 is CPU5
The aperture motor 29 is driven according to the information from the aperture 28.
Therefore, the light of the Xs discharge light is narrowed down to the set intensity. When the brightness reaches the set value, the aperture 28 is maintained at that aperture position. At this time, the focused light source light, that is, the observation light, is monitored by the CPU 55 via the light receiving element 32, and the diaphragm 28 is serge-controlled so that the set brightness is maintained constant. Therefore, due to voltage fluctuations, discharge rung 1
Even if the amount of light from the endoscope 8 decreases, the brightness of the light from the endoscope 1 that enters the end 19 remains constant. Furthermore, Lang 18
If the lamp 18 has been used for a long period of time and the light intensity of the lamp 18 has decreased, dimming can only be performed below the reduced light intensity. Only the maximum light intensity of the degraded rung 18, for example 90chi, 80es, is displayed. This display allows you to understand the necessity of lamp replacement.

Next, the photographing operation will be explained with reference to the time chart shown in FIG.

When the release switch 15 is closed, the light source shutter 28 begins to open, and the signal at the terminal e solstice 5 of the camera 3 becomes low level, and the light source shutter 26 begins to close.
The light incident on the light guide end 19 is blocked, and the output of the integrator/current-voltage converter 37 becomes a zero value. After a predetermined time, the mirror shutter 12 of the camera 3 opens and the light source 26 is closed.
When the light source shutter 26 is fully opened, light enters the light guide end 19, and the output of the integration/current-voltage converter 37 operates as an integrator to integrate the received light signal corresponding to the reflected light from the object.When the light source shutter 26 is fully opened, the Lang 18 flashes. When the calculated exposure value reaches the proper exposure value, a '5TOP' signal is generated, the Xe lamp 18 stops emitting light, and after a certain period of time, the mirror shutter 12 is closed and the photographing is completed. After this,
The e-lung 18 is turned on for observation, the diaphragm 28 controls the observation light to a set intensity, and the camera returns to the observation state. Note that Vref in the exposure calculation is determined by the ASA settings provided in the camera, and the light source is also set to the same ASA K, so it is possible to calculate the exposure before shooting.

Another embodiment is shown in FIG. 9, in which a strobe rung 101 and a halogen rung f102 are used as light sources.

In this case, the light receiving cable 32 is provided at the center of the mirror 103 and is arranged to receive the source of the halodan lamp 102 that has passed through the opening 106. At this time, the mirror 103 becomes a gk surface and the light from the strobe lamp 101 is sent to the light receiving element 32VC.
It is designed to guide you. However, since the strobe light on the back side is extremely strong, the reflectance is not made too high.For example, a precisely finished metal surface may be used.With this configuration, the light receiving element 32 by light guide 711
9 can be measured. FIG. 10 shows perspectively the arrangement of the light guide end 19, the light receiving element 32, the halogen rung 102, and the mirror 103. mirror 1
03 is moved by the optical path switching solenoid 105.

FIG. 11 shows the signal processing circuit 17 of the light source unit 2 of FIG. 9. In this circuit, a current-voltage converter 75 is provided after the light-receiving element 32, and its output is input to the A3 channel of the A/D converter 58, and is also passed through a signal inversion amplifier and a resistor 109f to an integrator/sample hold circuit 107. is input. The output of the integrator/sample hold circuit 107 is A2 of the A/D converter 58.
input to the channel. Analog switch 111 is used to reset the integrator, and analog switch 112 is used for sample hold after integration. The number of integrals is determined by the resistor 109 and the capacitor 110. 113 is a timer interface called PIC. This PIC uses the 8253A'i in Intel's 8085 family. Clock CLK is CP
It is supplied from the clock of U55, and “GATE” is “Z”.
The "ERO-CRO8S" signal is supplied, and the "BRIGHT" multiple is input/output to "OUT".

FIG. 12 shows a power supply circuit, and according to this circuit, a strobe lamp 101 and a halogen lamp f102
A lighting circuit is provided for the 4 main canopies 114.
is connected to the voltage doubler rectifier circuit 125. Charging control circuit 1
26 controls the charging pressure of the main carrier/mother 114 to be constant, and generates a "CHARGE" signal when charging is completed. Harodan Run! 102 has a triac 129 installed in series and this triac 1291kT.
A phase control circuit 128 that controls I11 is connected.

In the above device, a pre-imaging capsule volume calculation is performed.

In this case, for example, the nower switch 145 is turned ON''.
In the initial operation at a regular time, the ASA sensitivity etc. are set, and if it is above the set predetermined value, the integral canister starter 110 is reset, and if it is less than the predetermined value, a warning of insufficient light quantity is issued. When the integral signal/shaft 110 is reset, the halogen lamp f102 is turned on, and the multi-breather of the A/D converter 58 is set to A3. When the Halodan run f102 lights up to its maximum, data is read from the A/D converter 58. Based on this data, it is determined whether the total amount of light emitted by the halogen rung 102 is within the specified light amount, and if NO#, a decrease in the amount of light from the halogen lamp is displayed. If the determination is YES, the pre-exposure calculation pre-processing ends. This pre-exposure calculation process is detailed in ``Automatic Exposure Device for Endoscopic Photography System'' filed on November 18, 1981. explained.

The light amount adjustment of the halogen rung 102 is performed by the PIC 113, and this is performed using the 8253Ai mode 5. Phase angle timing is ZEROCRO8
When the count reaches 0 after counting down from the S' signal, only the 1#i3 period of the clock is output to OUT'. The count amount is determined by CPU 55 depending on the setting interval.
The count register is loaded with the number of clock cycles of the phase angle. The count is reset by the CPU 55 just in case, and is counted down by the clock. By doing this, the CPU 58 arbitrarily adjusts the amount of light of the halogen rung 102 according to the setting value 2>1. Since the amount of light from the halogen rung 102 can be adjusted as described above, automatic light control is possible according to the set value. But Harodan Run! 102 is not suitable for cine photography because the change in color temperature is large when the light amount is adjusted by electric current. Furthermore, the halogen rungs themselves are not suitable for cinema because of their lack of light intensity.

Regarding the manual light intensity setting, a predetermined light intensity-phase angle (count value) table is used to load the count register of the PIC 11J according to the set light intensity. As a result, the CPU 55 has a halogen rung of 10
2 light t? It can be changed arbitrarily.

Pre-shooting exposure calculations are performed in the same manner as in the previous application. However, Lsend is the amount of light sent out from the halogen rung 102, and Lr5W is the amount of light reflected from the subject by the halogen rung 102. The minimum shooting limit for theory is 100 minutes L.
−t. This indicates that the possible shooting range has expanded, and is it possible to shoot in a flash? This means that the dimming range is wide. When determining Lsend Lrev t- using the halogen rung 102, it is necessary that the spectral sensitivities of the light receiving elements 14 and 32 match.

The still photographing operation operates according to the time chart shown in FIG. In this photographing operation, the flash "-'5TOP" of the strobe lamp 10 is performed by well-known direct current control and commutation from light emission to stop. Of course, when taking still photos, we make sure that the exposure calculations are appropriate before taking the photo. Since the subject is inside the body cavity, the stomach and other parts move repeatedly, so even if there is a shift due to movement between the time when the exposure is calculated before the picture is taken, it will only take a small amount of time, so it is possible to Movement is not possible. Therefore, the exposure is calculated in real time while the film is being guided, rather than being controlled based on the exposure value calculated in the exposure calculation before shooting, so there is a risk that the film may become overexposed and act as a cross-amplifier. do not have.

As explained above, according to the present invention, the observation light incident on the light guide is monitored by the light receiving element and maintained at a constant brightness level, so that lamp variations, misalignment, rung deterioration, and voltage fluctuations can be avoided. Even if these occur, a constant amount of light can be stably obtained without being affected by them. The present invention can also be used to calculate the total output of the light receiving element that monitors the light incident on the light guide, but the CPU can easily perform the pre-photography exposure calculation when manually setting the observation light. Also, the incident light on the light guide? The light receiving element for monitoring monitors the light guided by a light guiding member such as acrylic resin, but a light guide fiber is used as the light guiding member and the observed light is monitored by a light receiving element placed at a distant position. It's okay. Furthermore, the brightness control is not limited to eight levels, but may be more finely controlled, for example, to 100 levels.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a companion endoscope system using an endoscope light source device according to an embodiment of the present invention, Fig. 2 is an internal configuration diagram of the endoscope system shown in Fig. 1, and Fig. 3 is an aperture mechanism. Figure 4 is a circuit diagram of the camera circuit, Figure 5 is a circuit diagram of the signal processing circuit of the light source unit, and Figure 6 is a circuit diagram of the condition setting salary display circuit shown in Figure 5. 7 is a circuit diagram of the power supply circuit, FIG. 8 is a time chart diagram explaining the photographing operation, and FIG. 10 is a schematic configuration diagram of an endoscope system using an endoscope light source device of another embodiment. , FIG. 11 is a circuit diagram of the signal processing circuit of the light source unit shown in FIG. 10, FIG. 12 is a circuit diagram of the power supply circuit of the light source unit used in FIG. 11, and FIG. 13 is an implementation of FIG. 10. FIG. 7 is a time chart diagram illustrating a photographing operation according to an example. DESCRIPTION OF SYMBOLS 1... Endoscope, 2... Light source unit, 3... Camera 4... Subject, 13... Camera control circuit, 14...
...Light receiving element, 15...Release switch, 17...
・Light source control circuit, 18...Xs discharge rung, 26...
・Sha. Evening blade, 28... Aperture blade, 3... Light guiding member, 3
2... Light receiving element, 137... Brightness indicator, 138
... light switch, chi, 139... dark switch, 144.
...PPI. Applicant's representative Patent attorney Suzuko Takehiko Figure 1, ゎ57Y4-88 Commissioner of the Japan Patent Office Shima 1) Haruki Tono ■, Indication of the case Patent application No. 1982-193798 2, Name of the invention Endoscope Light source device 3, relationship with the case of the person making the amendment Patent applicant (037) Olympus Optical Industry Co., Ltd. 4, agent March 30, 1982 6, Specification subject to supplementary IE 7, contents of amendment (1) In the attached specification of the application, on page 22, line 18 of fjfj, after "time chart diagram," there is a statement that says "Figure 9 is an internal configuration diagram of an endoscope system using an endoscope light source device according to another embodiment. ” is inserted. Kazuo Wakasugi, Commissioner of the Japan Patent Office (Monday, Showa) 1. Indication of the case Patent Application No. 193798-1982 2. Name of the invention: Endoscope light source device: 3. Relationship with the Nagisa case involving City 1 Patent applicant (037) Olympus Optical Industry Co., Ltd. 4, Agent 6, Sodeyama subject specification, drawing 7, contents of amendment (1) Specification attached to application 5 In the 9th line of the page, "Operational amplifier 42" is corrected to "4th amplifier 41." (2) Delete “CHARGE” terminal on page 7 @ line 6. (3) On page 8, line 7 of the same page, ``Boat PbJ'' is corrected to ``Boat PBJ.'' (4) On page 8, line 9 of the same page, ``Boat Pa J'' is changed to ``Boat PAJ.'' (5) On page 13, line 13 of the same page, "by aperture 28"
The statement has been corrected to read "by aperture 28." (6) “Signal at 5” on page 14, line 14.
Correct the statement to read "signal at f." (7) In the 5th line of page 18, the words "settings" should be corrected to "settings." (8) "58" on page 19, line 12 of the same page was replaced with "58".
5,” he corrected. (9) Correct r Lrev J in the 8th line of the 20th member to rLrcvJ. 01 Same @ page 20, line 13, it says "Lrev J" (correct the second sign "0" to reJ and 1'-" CH
Add a leader line to ARGE"J. 02 Correct the same figure 11 as shown in the attached sheet.

Claims (1)

[Scope of Claims] l) A light source that generates at least observation light, a light receiving element that detects the observation light that enters the light guide of the endoscope from the light source, and means for setting the brightness of the observation light. An endoscope light source device comprising a display means for displaying a set brightness, and a light control means for measuring the detected light of the light receiving element and maintaining the observation light at the set brightness. 2) The light adjustment means includes an aperture for adjusting the observation light from the light source and a means for measuring the light detected by the light receiving element and controlling the aperture so that the observation light has a set brightness. An endoscope light source device according to claim 1. 3) The endoscope light source device according to claim 1, wherein the light source is constituted by a halogen lamp, and the dimming means is constituted by means for supplying a phase-controlled lighting current to the halogen lamp. Claims 1 to 3, wherein the display means is constituted by a plurality of arrays of light emitting diodes corresponding to the degree of brightness, and is constituted by a light emitting diode display device that displays the brightness in stages. The endoscope light source device according to any one of.