JPS6340096B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an endoscopic photographing device that performs endoscopic photography by combining an endoscope, an endoscopic camera, and a light source unit.

[Problem to be solved] When taking pictures of the inside of a body cavity by combining an endoscope, an endoscope camera, and a light source unit, the endoscope and endoscope camera are integrated, but the exposure A light source unit including a switch for setting photographing information such as constants, a light source, etc. is installed at a separate location, and is connected to the endoscope and the endoscope camera via a cable. For this reason, the operator who performs endoscopic observation and photography during photography is concentrating on observing the endoscopic image, and thus tends to neglect operating the light source unit located at a remote location. especially,
When multiple push-button exposure constant setting switches are arranged side by side, the operator has to view these switches far from the eyes and from an unnatural direction, making it difficult to see which button is being pressed, and also keeping the hands away. Since you have to stretch it out to operate it, you may have to press several push buttons at the same time. Also, sometimes the user forgets to press the button to take a photo. Pressing several buttons at the same time,
If you forget to press the button, you will not be able to obtain the correct exposure constant, and as a result, you will not be able to take pictures with the proper exposure amount, resulting in blurry photographs. Further, the push button type has the inconvenience that the exposure constant can only be selected in stages, and intermediate exposure constants cannot be obtained.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an endoscope photographing device that does not cause the exposure constant to become too large even in the event of an operational error, and can obtain an intermediate exposure constant.

[Means for Solving the Problems] According to the present invention, there is provided an exposure control means capable of setting different exposure constants, an exposure constant selection means having a plurality of manual switches corresponding to each exposure constant for selecting and setting an exposure constant; detection means for detecting non-selection of an exposure constant by the exposure constant selection means;
and intermediate exposure constant setting means for setting the exposure control means to an intermediate exposure constant among the exposure constants in response to a non-selection detection signal of the detection means. be done.

[Operation] The exposure constant selection means selects a desired exposure constant from the exposure constants of the exposure control means according to the type of film. The detection means detects a state in which the exposure constant is not selected by the exposure constant selection means, and in response to this detection signal, the exposure control means is set to an intermediate exposure constant by the intermediate exposure setting means.

[Embodiment] FIG. 1 shows a light source unit 11, and a push button 1 is provided on the entire surface of the light source unit 11.
A pushbutton panel 12 is provided in which pushbuttons 2 ₁ to 12 ₉ are arranged. The pushbuttons on the pushbutton panel 12 are provided to set an exposure constant according to the type of film stored in the camera during endoscopic photography. Furthermore, on the entire surface of the light source unit 11,
A power switch 13, a light source adjustment knob 14, an alarm 15, and an endoscope connector 16 are provided, and a ventilation port 17 is provided on the side.

FIG. 2 shows a circuit for performing endoscope automatic exposure photography based on exposure constants set by pushbuttons 12 ₁ to 12 ₉ provided on the light source unit 11. In this figure, the detection unit 101
is connected to the notification section 102. That is, pushbutton 1
Switches that open and close in conjunction with the operations of 2 ₁ to 12 ₉
SW ₁ to SW ₉ include lamps L ₁ to L ₄ , a series circuit of diode D ₂₂ and lamp L ₅ , and lamp L ₆ , respectively.
are connected to the power supply line _20a through diodes _D1 to _D9 and resistors _R1 to _R9 , respectively. These lamps L ₁ to L ₉ are provided, for example, within the cover of the pushbutton.

Power supply line 20a is connected to power supply ₂₁ via resistor R10.
connected to the positive terminal of the The negative terminal of this power supply 21 is connected to switches SW ₁ to SW ₉ via a power supply line 20b. The power supply 21 has voltage dividing resistors R ₁₁ , R ₁₂ , R ₁₃
is connected. The connection point of the voltage dividing resistors R ₁₁ and R ₁₂ is connected to the inverting input terminal of the operational amplifier 22, and the voltage dividing resistor
The connection point between R ₁₂ and R ₁₃ is connected to the non-inverting input terminal of the operational amplifier 23. A non-inverting input terminal of the operational amplifier 22 and an inverting input terminal of the operational amplifier 23 are connected to the power supply line 20a. The output terminals of the operational amplifiers 22 and 23 are connected to an oscillator 24 via diodes D ₂₀ and D ₂₁ in the forward direction, respectively.

The output terminal of the oscillator 24 is connected to an alarm speaker 26 via an audio current generating circuit 25 and to the base of a transistor 27. The collector of transistor 27 is connected to the positive terminal of power supply 28, and the emitter is connected to lamps _L1 to _L9 via diodes _D11 to _D19 , respectively. The negative pole of power supply 28 is connected to line 20b.

The output terminal of the operational amplifier 22 is connected to the base of a transistor 29 via a resistor _R14 . Via the collector-emitter path of transistor 29, line 20b is connected to the junction of diode D ₂₂ and lamp L ₅ . The output terminal of the operational amplifier 22 is connected to the control input terminal of the electronic switch 30. The electronic switch 30 as the intermediate exposure constant setting section 103 is one of the switches SW ₁₁ to SW ₁₉ of the exposure constant selection section 104 that is linked to the switches SW ₁ to SW ₉ .
Connected in parallel to SW ₁₅ . Switch SW ₁₁ ~
One end of SW ₁₉ is connected to resistor R ₁₅ of exposure control section 105.
They are connected to the output end of the operational amplifier 31 via _R23 , and the other end is connected to one input end of the operational amplifier 33 of the integrating circuit 32. Resistors R ₁₅ to R ₂₃ have resistance values that decrease geometrically in this order. For example, the resistance values of the resistors R ₁₅ to R ₂₃ are determined so that R ₁₅ = 2R ₁₆ = 4R ₁₇ = 8R ₁₈ .

A capacitor _C1 and a switch _SW20 are connected in parallel between one input end and an output end of the operational amplifier 33. The integrating circuit 32 includes switches SW ₁₁ to SW _19.
The integral constant is configured to be changed by selecting resistors R ₁₅ to R ₂₃ , and this output terminal is connected to one input terminal of an operational amplifier 34 via a resistor R ₂₄ . One input terminal of the operational amplifier 34 is further connected to a reference power supply 35 via resistors _R25 and _R26 .
connected to. An electronic switch 36 as a correction section 106 is connected in parallel to the resistor R ₂₆ , and the control input terminal of the electronic switch 36 is connected to the operational amplifier 23.
connected to the output end of the The switch 36 is controlled to open or close by the output of the operational amplifier 23. The other input terminal of the operational amplifier 34 is connected to the other input terminal of the operational amplifier 33 and one output terminal of a light receiving element 39 provided in the endoscope 38 . The output end of the operational amplifier 34 is connected to a solenoid drive circuit 37, and the output end of this drive circuit 37 is connected to a solenoid 43 of a shutter device 42 provided between a light source 40 and an incident light end of a light guide 41 of an endoscope 38. Connected.

When performing endoscopic photography by connecting the endoscope 38 to a light source unit incorporating the above-mentioned circuit,
The pushbuttons 12 ₁ to 12 ₉ of the light source unit 11 correspond to the type of film 45 loaded in the camera 44.
is pressed. For example, if the power switch 13 is turned on with the push button 12 ₁ being pressed, or if the push button 12 ₁ is pressed with the light source turned on, the switch SW ₁ is closed and the resistors R ₁₀ and R ₁ are turned on. A current flows through. Therefore, since the voltage at the inverting input terminal of the operational amplifier 22 is higher than that at the non-inverting input terminal, and the voltage at the non-inverting input terminal of the operational amplifier 23 is lower than the voltage at the inverting input terminal, the outputs of the operational amplifiers 22 and 23 Both are at L level. Therefore, the input of the oscillator 24 becomes L level, and the output becomes H level.
Therefore, transistor 27 turns on and lamp L1
A current is supplied from the power source 28 to turn on the lamp L1, indicating that the push button has been pressed correctly. Incidentally, since the input terminal of the audio current generating circuit 25 is not at the L level, the alarm speaker 26 is not activated.

Next, when you press the release button of the camera, the light sent into the body cavity via the light guide 41 is reflected from the body cavity wall, and this reflected light is transferred to the image guide 41.
6. The film 45 is exposed through the prism 43, eyepiece lens 48 and shutter 49. At this time, a part of the light reflected by the prism 47 is received by the light receiving element 39. This light receiving element 39 generates a photocurrent corresponding to the amount of light received, and this photocurrent is converted into voltage by the resistor 29, and the operational amplifier 31
and is input to an amplifier circuit constituted by resistors _R27 and _R28 . The output of this amplifier circuit is
It is integrated according to an integration constant determined by the resistor R ₁₅ and the capacitor C ₁ selected by the switch SW ₁₁ in conjunction with SW ₁ . That is, integration is performed according to an exposure constant depending on the film used. This integrated output is compared with the output of the reference power supply 35 by a level detection circuit 50 composed of resistors R ₂₄ , R ₂₅ , R ₂₆ , an electronic switch 36 and an operational amplifier 34 .
In this comparison operation, when the exposure amount reaches a certain value, the output of the operational amplifier 34 operates the solenoid drive circuit 37 to close the shutter of the shutter device 42. As a result, the film 45 is exposed with an appropriate exposure amount.

In the above description, a case has been described in which one pushbutton is operated accurately.Next, a case in which the power switch 13 is turned on without any pushbutton being pressed and an attempt is made to take a photograph will be explained. In this case, since power does not flow through the resistor _R10 , the potentials at the non-inverting input terminal of the operational amplifier 22 and the inverting input terminal of the operational amplifier 23 become high, the output of the operational amplifier 22 becomes H level, and the output of the operational amplifier 23 becomes L level. level. The H level signal of the operational amplifier 22 activates the electronic switch 30.
Close 0. Further, the transistor 29 is made conductive by the H level signal of the operational amplifier 22, and the lamp
L ₅ circuit is connected. At this time, the oscillator 24
oscillates, and the output of the oscillator 24 causes the speaker 26 to sound through the audio current generating circuit 25, and also turns the transistor 27 on and off intermittently, causing the lamp _L5 to blink.

Since the electronic switch 30 is connected in parallel to the switch SW ₁₅ , the resistor R ₁₉ connected to the switch SW ₁₅ is connected to the integrating circuit 32. Resistance R ₁₉
indicates a value corresponding to an intermediate exposure constant among the selectable exposure constants. In this case, when no push button is pressed, a photograph is taken using an intermediate exposure constant among the settable exposure constants, that is, an exposure constant corresponding to the push button ₁₂₅ .

Next, the power switch 13 is turned on with two adjacent pushbuttons, for example, the pushbuttons 12 ₁ and 12 ₂ being pressed simultaneously, or the power switch 13 is turned on and the pushbuttons 12 1 and 12 ₂ are pressed simultaneously.
The case where 12 _{and 2} are pressed at the same time will be explained.
In this case, since current flows through the two resistors R ₁ and R ₂ , the voltage drop across the resistor R ₁₀ increases, and the output of the operational amplifier 23 becomes H level. The oscillator 24 is activated by the H level signal from the operational amplifier 23, the speaker 26 emits an alarm sound, the transistor 27 is intermittently turned on and off, and the lamps L ₁ and L ₂ flash. At this time, switch SW ₁₁
and SW ₁₂ are both closed, so the integration constant of the integration circuit is determined by the parallel combined resistance of resistors R ₁₅ and R ₁₆ and the capacitor C ₁ . This integral constant results in a value that is completely far from the appropriate exposure constant. This requires modifying the exposure constant. In the exemplary embodiment, this modification is carried out in such a way that a constant is obtained that is intermediate in value between the constant determined by the resistor R ₁₅ and the constant determined by the adjacent resistor R ₁₆ . This intermediate value is the resistance
It is equal to 1/√2 of the constant determined by _R15 , and in order to obtain such a value, it is necessary to increase the reference voltage to the operational amplifier 34 by 3/√2. In this embodiment, instead of multiplying the reference voltage by 3/√2, the resistor R ₂₆ of the electrical path that supplies the reference voltage from the reference power source 35 to the operational amplifier 34 is short-circuited. That is, the output signal of the operational amplifier 23 closes the electronic switch 36 and short-circuits the resistor _R26 . This gives 3/√
When the integrated voltage reaches a certain value in the comparison between the double reference voltage and the integrated voltage, that is, when the exposure amount reaches a certain value, the output of the operational amplifier 34 is inverted, and the shutter device 42 blocks the light from the light source 40. do.

In the above embodiment, it has been explained that pressing two buttons at the same time is due to an operational error, but it is also possible to actively press two buttons at the same time to obtain an intermediate exposure constant.
Further, in the embodiment, a push button is used, but a toggle switch, seesaw switch, etc. can also be used. The same effect can be obtained even if two or more buttons are pressed at the same time.

[Effect of the invention] As explained above, when one push button is pressed correctly, a photograph is taken with the appropriate exposure amount based on the exposure constant set by the pressed push button, and the push button is pressed. If no pushbuttons are pressed at all, automatic exposure shooting will be performed based on the intermediate exposure constant among the multiple exposure constants that can be set using the pushbuttons, and if two pushbuttons are pushed at the same time, these pushbuttons will Automatic exposure photography can be performed based on an intermediate exposure constant among the exposure constants that can be set respectively. As a result, even if a user forgets to operate a push button or makes an operational error, automatic exposure photography can be performed at an exposure state close to the appropriate exposure amount, and serious failures in photography can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a light source unit incorporating an endoscope photography device according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of the endoscope photographing device. DESCRIPTION OF SYMBOLS 11... Light source unit, 12 ₁ to 12 ₉ ... Push button, 15... Alarm device, 22, 23... Operational amplifier, 24... Oscillator, 26... Alarm speaker, 27, 29... Transistor, 32... ...integrator circuit, 34... operational amplifier, 35... reference power supply,
30, 36... Electronic switch, 37... Solenoid drive circuit, 39... Light receiving element, 40... Light source,
41...Light guide, 42...Shutter device,
44...Endoscope camera required, 45...Film, 4
6... Image guide, 47... Prism, 49
... Shutter, 50 ... Level detection circuit, L ₁ to L ₉ ... Lamp, SW ₁ to SW ₁₉ ... Switch,
_R15 to _R23 ...Resistance, _R25 , _R26 ...Resistance.

Claims (1)

[Claims] 1. Exposure control means capable of setting different exposure constants; Exposure constant selection means having a plurality of manual switches corresponding to each exposure constant for selecting and setting the exposure constant; and Non-selection of the exposure constant by the exposure constant selection means. and means for setting the exposure control means to an intermediate exposure constant among the exposure constants in response to a non-selection detection signal of the detection means. Device.