JPS61250794A - Sheet film quantity detecting device - Google Patents

Abstract

PURPOSE:To detect the quantity of a sheet film even immediately after the sheet film is supplemented by holding both surfaces of the laminated sheet film layer with the fixed electrode plate and the movable electrode plate and detecting the static capacity during the period. CONSTITUTION:On the bottom surface in a film storing part 1, a fixed electrode late 2 of the conductive plate almost to cover the bottom surface is fixed. A movable electrode plate 4 is fixed through springs 5a and 5b onto the upper surface in the film storing part 1 by the conductive plate, can move in the thickness direction of a sheet film layer 3. A detecting part A detects the electrostatic capacity by using an RC oscillating device (a). An F/V converting device (d) converts the signal from the RC oscillating device (a) to the voltage corresponding to the frequency of the signal. When the F/V conversion is executed, the compensation of the temperature, humidity and dielectric constant of the sheet film is also simultaneously executed. The output voltage from the F/V converting device (d) is displayed by the quantity in accordance with the output voltage by using the displaying device. Consequently, the quantity displayed by a displaying device (e) comes to be the remaining quantity of the sheet film stored in the film storing part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field of the invention]
The present invention relates to a film number detection device for detecting the number of sheet films in a film storage unit used in an i+ shadow device.

[Technical background of the invention W41 When a surgeon performs continuous imaging of a body part using contrast imaging, if the film runs out during the continuous imaging, important imaging timing will be missed and the operator will have to perform contrast imaging again. . Since this repeat contrast imaging causes great pain and physical burden on the patient, the occurrence of such a situation must be avoided. For this reason, it has become necessary to detect the remaining amount of unshadowed film in the film storage section.

The sheet film number detection device used in the conventional cassette-less type radiographic imaging apparatus utilizes ultrasonic waves, as disclosed in, for example, Japanese Patent Laid-Open No. 56-167137.

Did you use this conventional ultrasound? -A device for detecting the number of sheets of film is shown in FIG.

The film storage section 21 shown in FIG. 5 is configured to block light from the outside and is a magazine case large enough to store sheet film. A portion of the upper surface of the film storage section 21 has an opening large enough to allow the sheet film to be taken out. Also, on the bottom surface of this film storage section 21, there is a layered film! l! ! A shadow sheet film layer 23 is placed. These unphotographed sheet films [123] are sucked and taken out one by one from the film storage section 21 by the film suction cylinder 26. Inside the film suction tube 26, there are provided an ultrasonic vibrator 24 that emits ultrasonic waves from the bottom of the film suction tube 26, and a branched suction vibrator 22 having five openings on the bottom of the film suction tube 26. It is being

For suction, this film suction tube 26 is attached to the sheet film layer 2.
When the bottom surface of the film suction tube 26 comes into contact with the outermost surface of the sheet film layer 23, the atmospheric pressure inside the suction vibrator 22 is lowered using a suction device (not shown). When the film sucker 111126 sucks the outermost sheet film from the sheet film layer 23, it conveys the sucked sheet film to a photographing position (not shown).

Conventional detection of the number of sheet films in the sheet film layer 23 is performed only when the bottom surface of the film suction tube 26 comes into contact with the outermost surface of the sheet film 823 because the film suction tube 26 and the sheet film layer 23 are constantly separated. .

The detection method is to sweep the frequency of the power supplied to the ultrasonic transducer 24, detect the peak of the ultrasonic echo signal that has returned through the sheet film layer 23, and then use the frequency at the detected peak. It was like calculating and displaying the number of sheets of film on the display P.

[Problems with Aoishi Technology] With such a conventional structure in which a detector is attached to a film suction tube, the number of remaining sheet films cannot be measured except when the sheet film is suctioned. For this reason, the number of sheets is not detected immediately after the sheet film is refilled in the film storage section, so the number of sheets before the sheet film is refilled is displayed on the display. Therefore, there was a problem in that the correct number of remaining sheet films would not be displayed unless the next sheet of film was taken out by suction from the film storage section after being replenished.

[Object of the Invention] The present invention has been made to solve this problem, and by pressing both sides of the laminated sheet film layer with a fixed electrode plate and a movable electrode plate, the sheet film can be removed immediately after replenishing the sheet film. An object of the present invention is to provide a film amount detection device capable of detecting the amount of sheet film.

[Summary of the Invention] In order to achieve this object, the present invention includes a film storage portion capable of storing a laminated sheet film, a first conductive member provided in the film storage portion, and a film storage portion that is stored in the film storage portion. a second conducting member 711 provided in the film storage section such that the distance from the first conducting member changes depending on the thickness of the sheet film layer;
The sheet film amount detection device includes a detection section that detects capacitance between an electrical member and the second electrically conductive member and outputs a signal based on this capacitance.

[Embodiments of the Invention] Hereinafter, a first embodiment of the present invention will be described with reference to the sectional view of FIG. 1 and the cross-sectional view of FIG.
This will be explained with reference to the block diagram shown in the figure.

First, in FIG. 1, a film storage section 1 is shaped like a magazine case in which a sheet film can be stored, and has an opening at the top large enough to allow the sheet film to be taken out. Further, the film storage section 1 is made of a material that blocks light from the outside to protect the sheet film inside the storage section. The shutter 14 is also made of the same material as the film storage part 1, and is used to close the opening so that no light enters into the film storage part 1 when the film storage part 1 is removed from the apparatus and carried outside.

A fixed electrode plate 2, which is a conductive plate, is fixed on the bottom surface of the film storage section 1 so as to cover the bottom surface of the film. On this fixed electrode plate 2, [! A sheet film layer 3 of the unphotographed shadow is placed.

The e-electrode plate 4 is a conductive plate that is fixed to the upper surface of the film storage section 1 via springs 5a and 5b, and is movable in the thickness direction of the sheet film layer 3. The movable electrode plate 4 is in contact with the uppermost surface of the sheet film WI3, and pushes the sheet film WI3 toward the surface of the fixed electrode plate 2 by springs 5a and 5b. That is, the movable electrode plate 4 moves up and down according to the number of sheet film layers 3 and is always located on the outermost surface of the sheet film layer 3. Then, the sheet films on the outermost surface of the sheet film layer 3 are suctioned and taken out one by one from the film storage section 1 by the film suction cylinder 6.

The fixed electrode plate 2 is connected to the terminal 1 via the connector 11 by a conductor.
1b. The movable electrode plate 4 is similarly connected to the terminal 11a via the connector 11 by a conductive wire. When looking inside the terminals 11a and 11b through the connector, capacitance is equivalently formed. This capacitance changes depending on the number of sealing films in the sheet film layer 3; the larger the number, the smaller the capacitance between the flexible electrode plate 4 and the fixed electrode plate 2, and the smaller the number ( If the sheet film is removed, the bottom surface of the movable electrode plate 4 and the top surface of the fixed electrode plate 2 will come into contact with each other, resulting in an electrical short circuit.

Next, explanation will be given with reference to the block diagram shown in FIG.

In FIG. 2, terminal 118.11b is the terminal 11 in FIG.
a and 11b, respectively. A in FIG. 2 is a detection section that detects the capacitance between the terminals 11a and 11b and outputs a signal corresponding to the capacitance. According to FIG. 2, an RC oscillator a is used in the detection section to detect capacitance.

The terminal 11a is connected to the resistor 16 and the input terminal of the inverter 15. The output terminal of this inverter 15 is connected to a resistor 16 and also serves as an output of the detection section.

Further, the terminal 11b is connected to a power source (not shown). The RC oscillation 81a oscillates by connecting in this way. The oscillation frequency changes depending on the capacitance between the conductive plates connected to the terminals 11a and 11b and the value of the resistor 16. Since the resistor 16 is now fixed, the oscillation frequency changes only depending on the capacitance. For example, when the distance between the electrode plates 2 and 4 becomes smaller and the capacitance becomes thicker, the oscillation frequency becomes smaller. Conversely, as the distance between the electrode plates 2 and 4 increases, the capacitance decreases and the oscillation frequency increases. A signal from the RC oscillator a is input to the F/V converter d and the oscillation stop detector 1.

The display section E is composed of an F/V converter d and a display device e,
Converts the signal from the detection unit so that it can be viewed by the operator. The F/V converter yAid converts the signal from RCf@oscillator a into a voltage corresponding to the frequency of this signal. This F
F/V converter d, which simultaneously compensates for temperature, humidity, and sheet film dielectric constant when performing /V conversion.
The output voltage is displayed by the display in a quantity corresponding to this output voltage. Therefore, the quantity displayed on the display e is the remaining number m of sheet films stored in the film storage section.

When the sheet film in the film storage section runs out, the electrode plates 2.4 come into contact and oscillation stops. This is detected by the oscillation stop detector 1, and a radiography prohibition command is given to the radiation source control unit 3. This oscillation stop detector 1 can prevent unnecessary radiation exposure to patients.

The above is the description of the first embodiment of the present invention.

The first embodiment eliminates the need for a frequency sweep oscillator, a peak detector, and an arithmetic unit that have been used in the past, making the entire circuit extremely simple. As a result, it is lightweight, reduces the number of failures, and improves reliability.

It should be noted that the present invention is not limited to the embodiments shown in FIGS. 1 and 2, but can be implemented with various modifications without changing the gist thereof.

For example, in the embodiment shown in FIG. 2, a bridge circuit, a multivibrator circuit, and a Wien bridge oscillation circuit can be applied to the detection section, and a frequency counter, an analog comparator, and a voice synthesizer can be applied to the display section E.

As other embodiments of the present invention, FIG. 3 shows a second embodiment, and FIG. 4 shows a third embodiment. In addition, the same numbers are attached to the parts in the figures that indicate the same functions.

First, the sectional view of the second embodiment of the present invention shown in FIG. 3 will be described. A fixed electrode plate 2 is fixed to a part of the bottom surface of the film storage section 1, avoiding the sheet film layer 3 (i). The movable plate 4a is attached to the upper surface of the film storage section 1 via springs 5a and 5b, and the movable electrode plate 4 is provided on a part of the bottom surface of the movable plate 4a. This movable electrode plate 4 always faces the fixed electrode plate 2 and is therefore not in contact with the film layer 3. There is no sheet film layer 3 between these electrode plates, and there is air.

The fixed electrode plate 2 is connected to the terminal 11b via the connector 11,
The movable electrodes 4 are each connected to a terminal 11a, and the terminals 11a and 11b are further connected to a detection section A in FIG. 2.

With such a structure, it is possible to eliminate measurement errors due to air layers accumulated between the surfaces of the sheet film. In other words, capacitance can be detected only by the dielectric constant of air.

Next, a description will be given with reference to a sectional view of a third embodiment of the present invention shown in FIG. A part of the upper surface of the film storage section 1 has an opening large enough to allow the sheet film to be taken out. The film suction cylinder 6 descends from above this opening in the direction of the arrow 6a. A branch type suction vibrator 10 is provided inside the film suction cylinder 6, and the air pressure inside this pipe is lowered by a suction device (not shown) to suction the Sea 1 film on the outermost surface of the sheet film layer 3. The film suction cylinder 6 has
The planar cam 7 is installed. When the film suction tube 6 descends, the cam rod 8 is pushed in the direction of arrow 88 by the planar cam 7. One ends of the wires 9a and 9b are each connected to the cam rod, and the other ends are each connected to the movable electrode plate 4. Pulleys 9c and 9d fixed to the film storage section 1 are indicated by the arrow 8a of the cam rod 8.

8b direction is changed to vertical movement of the movable electrode plate 4. Therefore, when the cam rod 8 is pushed in the direction of the arrow 8a, the movable electrode plate 4 is lifted by being pulled by the wires 9a and 9d.

In this way, when taking out the sheet film from the film storage section 1, a space is created between the movable electrode plate 4 and the sheet film, so that the sheet film can be taken out without marking any scratches.

When the film suction cylinder 6 suctions the sheet film and moves upward, the cam rod 8 moves in the direction of the arrow 8b and returns to its original state. This is because the movable electrode plate 4 is always pushed downward by the springs 5a and 5b, so unless a force is applied to the cam rod 8 in the direction of the arrow 8a, the cam rod 8 will move in the direction of the arrow 8a.
Move in direction b. Further, when replenishing the film storage section 1 with sheet film, the lever 12 is pulled in the direction of the arrow 8a to lift the movable electrode plate 4. This makes it easy to replenish the sheet film.

As a method for lifting the flexible ah electrode plate 4, in addition to the method using a cam as in the embodiment shown in FIG. 4, methods using an electromagnet, a motor, or a suction device can also be applied.

In addition, in the embodiment, one set of fixed electrode plate 2 and movable electrode plate 4
However, multiple sets of electrode plates may be used.

[Effects of the Invention] The present invention has the above-mentioned J: sea urchin.Since both sides of the laminated sheet film are pressed by electrode plates, even if the sheet film is replenished and the sheet film is directly penetrated, the sea urchin can be easily removed.・Can detect several layers of film, and can also store sheet film stably.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a first embodiment showing a film storage section according to the present invention, FIG. 2 is a block diagram of an embodiment showing the configuration of a film number detection device according to the present invention, and FIG. Sectional view of the second embodiment showing the storage section, No. 4
The figure is a sectional view of a third embodiment of the film storage section according to the present invention, and FIG. 5 is a configuration diagram of a conventional film number detection device. 1...Film storage section, 2...Fixed electrode plate 3.
... Sheet film layer, 4... Movable electrode plate 5a, 5
b...Spring, 6...Film adsorption tube A...
・Detection part, E... Display part a... RC transmitter, d... F/V variable w converter 8 unit C/Display, I... Excavation stop detector l... Radiation source Controller representative patent attorney Kensuke Norichika (1 person) Figure 1 Figure 2 Figure 3 + X Yu

Claims (1)

[Claims] a film storage section capable of storing a laminated sheet film; a first conductive member provided in the film storage section;
a second conductive member provided in the film storage portion such that a distance from the first conductive member changes depending on the thickness of the sheet film layer stored in the film storage portion; A sheet film amount detection device comprising: a detecting section that detects capacitance between the member and the second conductive member and outputs a signal based on the capacitance.