JPS5918939A - Synchronizing signal generating circuit - Google Patents

Abstract

PURPOSE:To obtain an easily adjustable synchronizing signal generating circuit for an endoscope with a simple constitution, by detecting the displacement of a member which is associated operatively with camera release operation, and generating a syncrhonizing pulse through a delay means. CONSTITUTION:When a diaphragm lever moves under the camera release operation, a photocoupler 28 turns off to trigger a monostable multivibrator 41. Consequently, a negative synchronizing pulse is outputted through a capacitor 44 after a delay time corresponding to the time constant determined by a resistance 42 and a capacitor 43 to ignite a discharge tube for a photographic light source. Consequently, the endoscope synchronizing signal generating circuit of a simple constitution which facilitates delay time adjustment by the resistance of a time constant circuit is obtained.

Description

[Detailed Description of the Invention] This invention relates to an adapter for connecting an endoscope and a camera.
In particular, it relates to the synchronization signal generation circuit.

Generally, when taking endoscopic photographs, it is necessary to increase the amount of light from the light source compared to during normal observation, so it is necessary to transmit a synchronization signal from the camera to the light source device. If you want to take a photo using a general camera instead of a special camera,
Since the camera is connected to the eyepiece of the endoscope via the adapter, the camera and the adder are connected by an anncrocoat or the like, and a synchronization signal is transmitted to the adapter.

There is an electrical contact between the adder and the eyepiece of the endoscope, through which a synchronization signal is transmitted.

However, if the signal transmission between the camera and the adapter is carried out using a complete synchronization cord or the like, the synchronization cord or the like must be attached or detached each time the camera is attached or detached from the adapter, which is extremely inconvenient and difficult to operate. Furthermore, there is a risk that photographing may fail due to poor connection.

This invention was made to deal with the above-mentioned circumstances,
Its purpose is to provide synchronization for endoscope force adapters with a simple configuration that detects the camera release operation and generates a synchronization signal accordingly, without using a synchro code, etc., and with high reliability. An object of the present invention is to provide a signal generation circuit.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a synchronization signal generation circuit according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of an endoscopic photographing system, and FIG. 2 is a schematic configuration diagram thereof. Endoscope 1
is roughly divided into an operation section 2 and an insertion/insertion section 3. The operating section 2 is provided with an eyepiece section 4, an angle knob 5, etc., and is also connected to a universal cord 6. A camera 8 is connected to the eyepiece 4 via an adapter 7 including a synchronization signal generating circuit according to this embodiment. In this example, the camera 8 has the body of a normal open-air photometric reflex camera. The tip of the universal cord 6 is connected to a light source device 10 via a connector 9.

As shown in FIG. 2, an image guide 1 and a light guide 12 are inserted into the endoscope 1.

The image guide 11 has its distal end facing the objective lens 13 at the distal end of the insertion section 3 and its other end facing an eyepiece 14 provided in the eyepiece section 4 .

The tip of the light guide 12 is guided to the tip of the insertion section 3, and the other end is completely passed through the universal cord 6 to the light source device 1.
I am led to 0. The light source device 10 has a light source 15 for observation and an S-shaped discharge tube 16 for photographing, and light from both is selectively incident on the light guide 12 by displacement of a mirror 17.The mirror 17 is not shown. Displaced by the drive unit between the position shown by the solid line and the position shown by the broken line.Discharge tube 1
A lens 18 is provided on the front surface of the lens 6 . Observation light source 15
The discharge tube 16 and a drive section (not shown) are connected to a control circuit 19 and controlled by signals from the control circuit 19.

As shown in FIG. 3, the adapter 7 has a substantially cylindrical shape, and at one end to which the camera 8 is connected is provided a first retaining portion 21 consisting of a plurality of protrusions 2θ protruding in the circumferential direction. Inside, as shown in FIG. 4, an arc-shaped lever 22 serving as release detection means is rotatably supported at one end by a screw 23 and biased by a spring 24 in the direction of the arrow in the figure. The lever 22 is biased by 7
Bus 25 stopped me on the way. At the other end of the lever 22, an actuating portion 26 is bent at a substantially right angle.
The actuating part 26 is a hole 27 formed on one end surface of the adapter 7.
It protrudes toward the camera. Furthermore, one side of the other end of the lever 22 is formed as a light reflecting surface 28. Lever 2
A photocoupler 29 is disposed at a position facing the light reflecting surface 28 when the photocoupler 2 is urged by the spring 24 until it comes into contact with the stopper 25 . The light emitting diode in the photocoupler 29 has directivity directed toward the reflecting surface 28, and the emitted light is reflected by the reflecting surface 28 and enters the phototransistor. The output end of the photocoupler 29 is connected to the pulse generation circuit Z0, and the photocoupler 29 and the pulse generation circuit 30 correspond to a synchronization signal generation circuit. An electrical contact is provided between the adapter 7 and the eyepiece 4 of the endoscope 1, and the contact is electrically connected by connecting the two. The pulse generating circuit 3θ is connected to the light source device 10 through this contact.
It is electrically connected to the control circuit 19 of. Further, inside the adapter 7, a splitter 31 is provided which divides the incident light sent by the image guide 1) into two. One of the divided lights is incident on the camera 8, and the other divided light is incident on the photodetecting element 3.9, such as a photodiode, through the lens 32. The photodetector element 33 is also electrically connected to the control circuit 19 of the light source device 10.

The lens of the camera 8 is replaced as shown in Figure 5.
A second engaging part 35 that engages with the l (l engaging part 21 of the adapter 7 by a bayonet method) is formed in the "l" part 34 of the adapter 7, and the tip moves toward the center of the opening in conjunction with the release operation. A mirror 37 is provided in the camera 8. When the adapter 7 and the camera 8 are connected, the tip of the aperture lever 36 touches the operating portion 26 of the lever 22. Therefore, when the camera 8 is released,
The aperture lever 36, which moves along with the upper hand of the mirror 37, raises the actuating portion 26 and moves the lever 22 one turn in the opposite direction of the illustrated arrow against the force of the spring 24.

FIG. 6 shows a detailed circuit diagram of the pulse generation circuit 30 in the adapter 7. The output signal of the photocoupler 29 is inputted to the wire 8 and multivib break 4 via the capacitor 40. One shot multivibrator 41 is 55
It consists of a timer IC called 5. multi pipe lake 4
10 control terminal is connected to the power supply terminal -I-V via the variable resistor 42
K-connected and grounded via a capacitor 43. The output signal line of the multi-pipe lake 41 is supplied to the control circuit 19 of the light source device 10 via the capacitor 44. The output signal line is grounded via a diode 45 to prevent generation of excessive positive voltage. The signal line has resistors 46 and 47
are connected to the power supply terminal V1 and the ground terminal via the respective terminals.

The operation of an embodiment of such a configuration is shown in FIGS. 7(a) to (e).
) will be explained with reference to the time chart l- shown in FIG. 1st
As shown in the figure, when the camera 8 is connected to the eyepiece 4 of the endoscope 1 via the adapter 7, when the camera 8 is released, the aperture lever 36 of the camera 8 is moved upward from the position shown in FIG. will be moved. FIG. 7 (IL) shows the aperture 9 lever 360 position rvik. As the aperture lever 36 rises, the lever 22 in the adapter z is rotated via its actuating portion 26 in the direction opposite to the arrow in FIG. 4 against the biasing force of the spring 24. As a result, the reflective surface 28 formed on the side surface of the tip end of the lever 22 is removed from the position facing the seventh first cover 29.

As a result, the output transistor of the photocoupler 29 is turned off, and the one-shot multipipe leak 41 shown in FIG.
After this timing, outputs a high level signal for a predetermined period as shown in FIG. 7(b). This predetermined period is determined by the CR time constant of the resistor and capacitor connected to the control end of the multipipe rake 410. Therefore, this predetermined period can be easily changed by adjusting the variable resistor 42.

When the generation of this high-level signal is stopped, the fC charge stored in the canomicitor 44 is instantly discharged, so a low-level pulse as shown in FIG. 7(c) appears on the output signal line. This is transmitted to the light source device 10 as a shutter synchronization signal. After the camera 8 is released, the shutter point A is moved as shown in FIG. 7(d). Here, before the shirt release, Mi 2-17 is at the position shown by the solid line in the light source device 1θ for observation with an endoscope, and the light emitted from the observation light source 15 illuminates the object through the light guide 12. There is.

When the synchronization signal is supplied to the control circuit 19 of the light source device 10, the control circuit 19 turns off the observation light source 15, triggers the discharge tube 16, and rotates the mirror 17 to the position indicated by the broken line in the figure. As a result, a large amount of photographing light from the discharge tube 16 illuminates the subject. Here, since the control by the control circuit 19 is somewhat delayed from the synchronization signal, the timing of generation of the synchronization signal is set somewhat earlier than the timing of fully opening the front shutter curtain, as shown in FIG. 7(C). This adjustment can be easily performed by adjusting the CR time constant of the multivibrator 41, as described above. When the reflected light from the subject reaches a predetermined height, the shutter trailing curtain is moved as shown in FIG. 7(e), and photography is completed.

As explained above, according to this embodiment, all υ synchronization signals are generated by detecting the displacement of the members linked to the camera release operation within the adapter to which the camera is connected, so no connection cord is required for operation. A synchronizing signal generating circuit with good performance and high reliability is provided. Furthermore, this embodiment has the advantage that the timing at which the synchronization signal is generated can be easily adjusted.

Next, other embodiments of the invention will be described. FIG. 8 shows the main part of a second embodiment in which a reed switch is used instead of a photocoupler to detect the displacement of the aperture lever 36 that is linked to the release, and corresponds to FIG. 4. L/ bar inside adapter 7 ;l,? A magnet 5 is fixed to the tip of the reflective surface instead of a reflective surface, and a reed switch 5 is attached near this.
2 is provided. A reed switch 52 is connected to the pulse generation circuit 3o as in the first embodiment.

Also in this embodiment, the magnet 51 is displaced by the displacement of the aperture lever 36, so that the reed switch 5
Since the opening/closing state of the multivibrator 2 changes, a signal can be output from the multivibrator 41 in accordance with the release.

FIG. 9 is a perspective view showing the camera 8 which is the main part of the third embodiment. In the nine-lens camera 8 of this embodiment, instead of the aperture lever being displaced in conjunction with the release operation, the interlocking pin 53 protrudes and retracts.

In this case, a switch 56 consisting of two elastic plates 54 and 55 that are closed by the protrusion of the interlocking pin 53 is provided in the adapter 7. The switch 56 is the pulse generating circuit 30
is connected to a multivibrator 41. In this embodiment as well, the switch 56 is closed in conjunction with the release, so a synchronization signal can be obtained.Furthermore, in the embodiment described above, the displacement of the moving member of the aperture mechanism of the camera is detected; For example, the entire displacement of a mechanism linked to the release of a shutter or the like may be detected.

As explained above, according to the present invention, a synchronization signal generation circuit in which all synchronization signals can be easily written can be realized by detecting the displacement of a member that is linked to the camera release on the adapter side that is connected to the camera. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of a synchronization signal generating circuit according to the present invention, FIG. 2 is a schematic configuration diagram thereof, FIGS. 3 to 6 are diagrams showing details of each part of this embodiment, and FIG. figure(,)~
(o) is a time chart showing the operation of this embodiment;
9 are diagrams showing second and third embodiments of the present invention, respectively. 1... Inner prayer mirror, 7... Adapter, 8... Camera,
10... Light source device, 29... Photocoupler, 30.
...Pulse generation circuit, 36...Aperture lever. Applicant's agent Patent attorney Takehiko Suzue Figure 3 20 Figure 4 2 Figure 5 Figure 6

Claims (1)

[Claims] In the synchronization signal generation circuit provided in the adapter that connects the eyepiece section of the endoscope to which the light source device is connected and the objective section of the camera, the displacement of a member that is linked to the release operation of the camera connected to this adapter is detected. A synchronizing signal generating circuit, comprising means for detecting a synchronizing signal, a delay means to which an output signal of the detecting means is supplied, and a means for outputting a synchronizing pulse in accordance with the output signal of the delay means.