JPH0616397Y2 - X-ray servo diaphragm device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an X-ray diaphragm device for setting an X-ray irradiation field of an X-ray device, and particularly, the irradiation field is set both manually and automatically. The present invention relates to a servo diaphragm device that can be used.

[Conventional technology]

Conventionally, the servo diaphragm device has an automatic X-ray field setting circuit and a manual X-ray field setting circuit.
In the case of automatic setting, the I.D. I. The X-ray field set to the size is automatically set to the film size when the film moves to the shooting position (during shooting), and in the case of manual setting, the X-ray field at the time of fluoroscopy is set. , The size was kept transparent even during shooting, and this size was set to be variable.

For example, as shown in FIG. 3, when a blade inside the servo diaphragm device main body is driven, a motor M, a drive circuit A that drives this motor M, and a variable resistor that changes a motion resistance value in cooperation with the motor M 1PT, a resistor 1R that serves as a reference when automatically or manually selecting and setting an X-ray irradiation field, and an X-ray irradiation field selection push button (not shown) for setting the film size. Closed contact point 1n
DR (n = 1 to n) and 30 nR (n = 1) semi-fixed resistor for automatic setting for setting X-ray irradiation fields of various film sizes.
~ N) and semi-fixed resistance for manual setting 40nR (n = 1 ~ 1)
n) and the contacts 1DR _1a and 1DR _{3a which} are closed when the relay 1DR for automatically setting the X-ray irradiation field is energized and opened when not energized, and the contacts 1DR _2b and 1DR which are opened when energized and closed when not energized.
Corresponding to _4b (contact for manual setting), variable resistance 100R that opens and closes the X-ray irradiation field set corresponding to the semi-fixed resistor 30nR for automatic setting during automatic setting, and semi-fixed resistor 40nR for manual setting during manual setting The variable resistor 200R opens and closes the set X-ray irradiation field.

The resistor 1R, the semi-fixed resistor 30nR, the variable resistor 1PT and the variable resistor 100R, or the resistor 1R, the variable resistor 200R, the variable resistor 1PT, the semi-fixed resistor 40n.
A bridge circuit is formed by R. The servo diaphragm device is constructed by utilizing the fact that the bridge circuit is balanced.

In the case of manual setting, the bridge circuit is composed of a resistor 1R, a variable resistor 200R, a variable resistor 1PT and a semi-fixed resistor 40nR, and the variable resistor 200R is linked with the operation of the manual operator.
The irradiation field is set by maximizing the resistance value of 4 and adjusting the semi-fixed resistors 401R to 40nR corresponding to the selected irradiation field. Thus, when the manual operation device is operated, the selected irradiation field can be changed so as to be smaller than that.

In the case of automatic setting, the bridge circuit is composed of a resistor 1R, a variable resistor 100R, a variable resistor 1PT and a semi-fixed resistor 30nR.
The resistance value of 0R is maximized, and the semi-fixed resistors 301R to 30nR corresponding to the selected irradiation field are adjusted to set the irradiation field. Thereby, even if the irradiation field has not been set, if the automatic operation is selected, the irradiation field is automatically set. Here, the semi-fixed resistance is
It is a fixed resistance when it is set on the device and can be freely selected until it is set.

Further, the irradiation field of the blades of the servo diaphragm device is controlled with the upper and lower sides and the left and right sides of the film as a pair, and in the circuit in FIG. 3, since only the pair of upper and lower or left and right blades of the film is controlled, the entire film is controlled. Two of these circuits are usually used to control the irradiation field.

[Problems to be Solved by the Invention] However, in the conventional servo diaphragm device, since the setting circuit for the X-ray irradiation field is provided for both manual and automatic, the number of parts increases and the number of adjustment points increases. There was a problem. Then, there is a problem in that the efficiency of the adjustment work is poor because the adjustment of the setting of the irradiation field is not taken into consideration and there are many adjustment points.

The present invention has been made to solve the above problems.

An object of the present invention is to provide a technique capable of improving the efficiency of adjustment work by reducing the number of constituent parts of the servo diaphragm device and the number of adjustment points thereof.

The above and other objects and novel features of the present invention will be described with reference to the following description of the present specification and the accompanying drawings.

[Means for solving problems]

Of the devices disclosed in the present application, the outline of a typical one will be briefly described as follows.

That is, an electric motor that moves the blades that determine the X-ray irradiation field, a drive circuit that operates this electric motor, a variable resistor that changes the resistance value in association with the electric motor, and a reference for determining the X-ray irradiation field. A resistor that serves as a resistance, a manual setting device that allows the X-ray irradiation field to be changed arbitrarily during shooting, and a manual irradiation field setting circuit that corresponds to this manual setting device and sets the X-ray irradiation field to various film sizes. , An automatic setting device for adjusting various film sizes at the time of photographing, an automatic irradiation field setting circuit corresponding to the automatic setting device for setting the X-ray irradiation field to various film sizes, the manual setting device and the automatic setting device And a selection switch for selecting any of the above, and the first bridge circuit is configured by the manual setting device, the manual irradiation field setting circuit, the resistor and the variable resistor, and the automatic setting device, the automatic irradiation field. Setting circuit In X-ray servo diaphragm device constituting the second bridge circuit by a resistor and a variable resistor,
It is characterized in that an irradiation field setting circuit that serves as both the manual irradiation field setting circuit and the automatic irradiation field setting circuit is provided.

[Action]

According to the above-mentioned means, since the irradiation field setting circuit is provided so as to serve as both the irradiation field setting circuit and the automatic irradiation field setting circuit, the setting of the X-ray irradiation field can be shared automatically and manually. Therefore, the number of components and the number of adjustment points can be reduced.

〔Example〕

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

In all the drawings for explaining the embodiments, parts having the same function are designated by the same reference numerals, and repeated description thereof will be omitted.

FIG. 1 shows the X of an X-ray servo diaphragm device according to an embodiment of the present invention.
FIG. 2 is a circuit diagram showing a schematic configuration of the line servo aperture control circuit, and FIG. 2 is a circuit diagram showing a detailed configuration of the motor drive circuit shown in FIG.

As shown in FIG. 1, the X-ray servo diaphragm device of this embodiment has a motor M for driving the blades inside the servo diaphragm device body.
And a variable resistor 1PT that changes the movement resistance value in conjunction with
One resistor is used as a reference when automatically or manually selecting and setting the X-ray irradiation field, and one is selected and closed by the X-ray irradiation field selection push button (not shown) for setting the film size. Contact 1nDR (n = 1 to 4) and semi-fixed resistor 5 to set X-ray irradiation field of various film sizes
0nR (n = 1 to n) and a contact 1DR _1a that closes when the automatic setting relay 1DR for the X-ray irradiation field is energized and opens when it is not energized
And contact 1DR that opens when energized and closes when not energized
_2b (contact for manual setting) and half fixed resistance 50 for automatic setting
The variable resistor 100R opens and closes the X-ray irradiation field set corresponding to nR, and the variable resistor 200R opens and closes the X-ray irradiation field set corresponding to the semi-fixed resistance 50nR when manually set.

The automatic setting relay 1DR for the X-ray irradiation field is connected to the automatic side by turning on the manual / automatic changeover switch A / M, and the relay 100DR is energized when the X-ray imaging switch SW is closed. The contact 100DRa is configured to be biased by being closed.

The resistor 1R, the semi-fixed resistor 50nR, the variable resistor 1PT and the variable resistor 100R, or the resistor 1R, the semi-fixed resistor 40nR, the variable resistor 1PT and the variable resistor 20.
The bridge circuits are connected by 0R. The servo diaphragm control circuit is configured by utilizing the fact that these bridge circuits are in balance.

In the case of manual setting, a bridge circuit consisting of a resistor 1R, a variable resistor 200R, a variable resistor 1PT and a semi-fixed resistor 50nR is selected, and the resistance value of the variable resistor 200R that is linked with the operation of the manual operation device is maximized and selected. The irradiation field is set by adjusting the semi-fixed resistors 501R to 50nR corresponding to the irradiation field. With this, when you operate the manual operation unit,
The selected field can be varied to make it smaller.

In the case of automatic setting, a bridge circuit composed of a resistor 1R, a variable resistor 100R, a variable resistor 1PT and a semi-fixed resistor 50nR is selected, and the resistance value of the variable resistor 100R connected by the automatic operation selection is maximized and selected. The irradiation field is set by adjusting the semi-fixed resistors 501R to 50nR corresponding to the irradiation field. Thereby, even if the irradiation field has not been set, if the automatic operation is selected, the irradiation field is automatically set.

As shown in FIG. 2, the motor drive circuit A is composed of an operational amplifier OP, a resistor R and transistors Tr ₁ and Tr ₂ , and inputs the voltage at point P and the voltage at point Q to the operational amplifier OP, The motor M is rotated in a predetermined direction to slide the movable piece of the variable resistor 1PT until the difference between the two is eliminated.

In the servo aperture control circuit of the present embodiment, the semi-fixed resistor 50nR serves as both the X-ray field setting circuit 30nR of the conventional automatic setting circuit and the X-ray field setting circuit 40nR of the manual setting circuit shown in FIG. Therefore, the number of parts of the semi-fixed resistor is halved and the number of adjustment points is halved.

As a result, the cost of the device can be reduced.

The present invention has been specifically described above based on the embodiments, but it is needless to say that the present invention is not limited to the above embodiments and various modifications can be made without departing from the scope of the invention.

[Effect of device]

As described above, according to the present invention, by providing the irradiation field setting circuit that also serves as the manual irradiation field setting circuit and the automatic irradiation field setting circuit, the setting of the X-ray irradiation field is performed automatically or manually. Since it can be shared by both, the number of components and the number of adjustment points can be reduced. Thereby, the efficiency of the adjustment work can be improved.

[Brief description of drawings]

FIG. 1 shows the X of an X-ray servo diaphragm device according to an embodiment of the present invention.
FIG. 2 is a circuit diagram showing a schematic configuration of a line servo aperture control circuit, FIG. 2 is a circuit diagram showing a detailed configuration of the motor drive circuit shown in FIG. 1, and FIG. 3 is an X-ray of a conventional X-ray servo aperture device. It is a circuit diagram showing a schematic configuration of a servo aperture control circuit. In the figure, M ... Motor, 1PT ... Variable resistor, 1D
R _1a , 1DR _2b , 1nDR (n = 1 to 9), 100DR
a ... contact, 50nR (n = 1-9) ... semi-fixed resistance,
1DR ... Relay for automatic setting of X-ray irradiation field, 100R,
200R ... Variable resistance, A / M ... Manual / automatic switch, SW ... X-ray photographing switch, A ... Motor drive circuit.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. An electric motor for moving a blade for determining an X-ray irradiation field, a drive circuit for operating the electric motor, a variable resistor for changing a resistance value in association with the electric motor, and an X-ray irradiation field. A resistor that serves as a reference resistance, a manual setting device that allows the X-ray irradiation field to be changed arbitrarily at the time of shooting, and a manual irradiation field that corresponds to this manual setting device and sets the X-ray irradiation field to various film sizes. A setting circuit, an automatic setting device for adjusting various film sizes at the time of photographing, an automatic irradiation field setting circuit for setting the X-ray irradiation field to various film sizes corresponding to the automatic setting device, and the manual setting device. And a selector switch for selecting one of the automatic setting devices, and the first bridge circuit is configured by the manual setting device, the manual irradiation field setting circuit, the resistor and the variable resistor, Irradiation field setting times Second by a resistor and a variable resistor
In the X-ray servo diaphragm device constituting the bridge circuit of No. 6, an X-ray servo setting device is provided, which has an irradiation field setting circuit that serves as both the manual irradiation field setting circuit and the automatic irradiation field setting circuit.
Line servo diaphragm device.