CN1561910A

CN1561910A - Electric diaphragm driver in X-ray unit imaging system

Info

Publication number: CN1561910A
Application number: CNA2004100204429A
Authority: CN
Inventors: 江宏; 李佳民; 刘柏
Original assignee: SHENYANG DONGRUAN DIGITAL MEDICAL SYSTEM CO Ltd
Current assignee: Neusoft Medical Systems Co Ltd
Priority date: 2004-04-22
Filing date: 2004-04-22
Publication date: 2005-01-12
Anticipated expiration: 2024-04-22
Also published as: CN1264477C

Abstract

An electric light diaphragm driver for X-ray imaging system is composed of an executing unit consisting of motor, light diaphragm and filter, the controller consisting of motor driver and light diaphragm driver, and the control program firmed in the memory of CPU.

Description

Electronic diaphragm actuating device in the X line machine image system

Technical field

The invention belongs to technical field of medical instruments, be applicable to the control operation of diaphragm and optical filter in the image system of RF type X line machine.

Background technology

Image optical system is to use the image pre-treatment and the image acquisition units of the X line machine of image amplifier, usually the major function of X line machine has two, promptly expose and have an X-rayed, when perspective, image system collects the fluorescence of image amplifier output on the cameral CCD wafer, finally image on the monitor, electronic diaphragm is according to different acquisition mode (continuous acquisition, sequence is gathered) and the different visual field (big, in, little) action, the aperture of diaphragm is reached different sizes, improve signal noise ratio (snr) of image and spatial resolution, during exposure: exposure dose is very high, when the light intensity of image amplifier cutout screen output is perspective tens times, saturated for preventing the output of CCD wafer, must before camera lens, add light intensity attenuation equipment, optical filter can move to camera lens the place ahead automatically when exposure, electronic diaphragm is also got to smaller aperture simultaneously, play the decay light intensity, saturated to prevent the output of CCD wafer, and the effect that improves signal noise ratio (snr) of image, as seen, crucial effects is played to the picture quality of X line machine in the correct utilization of electronic diaphragm and optical filter and accurate location.

At present, the drive pattern that adopts in the image system of international mainstream type is: have two driver parts, two motor to drive respectively or a motor and a rotary solenoid, drive electronic diaphragm and optical filter respectively, its shortcoming is: the system cost height, drive circuit is many and complicated, and small product size is huge.

Summary of the invention

For solving the deficiency of driver part drive pattern in the present X line machine image system, purpose of the present invention provides electronic diaphragm actuating device in a kind of X line machine image system, adopt a driver part to carry out the interlock function of diaphragm and optical filter, control electronic diaphragm and optical filter coordination during with realization X line machine perspective and exposure, reach the optimized image effect.

Technical scheme of the present invention is achieved in that

Its structure of actuating device of the present invention is by motor, diaphragm, the execution unit that optical filter is formed, control circuit and control sequence three parts are formed, wherein on the step motor shaft pinion is housed in the execution unit, the diaphragm gear is equipped with in the pinion side, pinion and diaphragm gears engaged, the diaphragm gear connects with blade of diaphragm, the diaphragm gear rotates, the drive blade moves, and changes diaphragm and opens pore size, connects optical filter on motor shaft simultaneously, optical filter one end can freely rotate around motor shaft, the optical filter other end drives on the handle and has slotted hole for driving handle, is fixed with a vertical protrudent pin therewith on the gear of electronic diaphragm, be pin feature, protrudent pin on the diaphragm drives on the handle at optical filter and moves in the slotted hole, drives the optical filter motion, realizes the coordination linkage (as shown in Figure 1) of electronic diaphragm and optical filter; Control circuit is made up of aperture control circuit and motor-drive circuit two parts, wherein the aperture control circuit input is the Artificial Control input, form by four the tunnel, expose or pivot operation, wherein one the tunnel connects MUX MAX306, selects corresponding control signal (0～5V voltage signal), control signal is reconciled through potentiometer, be connected to the stepper motor driving circuit input, MUX MAX306 outfan is reconciled through potentiometer, is the multi-channel test point; Another road connects the multichannel display lamp respectively by three Bunper assemblies, to show the location status (as shown in Figure 4) of diaphragm, stepper motor driving circuit is core with CPUAT89C52, CPU input and A/D converter outfan join, and CPU output directly connects with the driven unit UP-4HB01 of motor by buffer DM7407 output, control step motor counting driving, freedom and guard mode (as shown in Figure 3); Solidified computer-controlled program in the CPU memory, the control method of this program is made up of the following step: flow chart (as shown in Figure 5)

Step 1 initialization: aperture reaches maximum (composing maximum FF to A) (101);

Step 2 is opened the AD conversion, and data are stored in depositor R0 (102);

Step 3 is subtracted each other laststate and current data, and difference is stored in R2 (being used to control the motor movement step number) (103);

Does step 4 judge that R2 equals 0?, wherein R2 equals 0, and then motor does not move, and preserves previous state aperture position (the previous state value is stored among the A), if R2 is not equal to 0, enters next step (104);

Does step 5 judge that R2 is smaller or equal to 2?, wherein R2＜=2 then enter not kinestate of motor, if R2＞2 enter next step (105);

Step 6 is laststate and current state aperture size (relatively size of data among A and the R0) relatively, the judgement motor positive and inverse, and does A＜R0 wherein with the several negates (111) among the R2, judge that number among the R2 is greater than 2? (112), R2 enters motor and does not move less than 2; State before preserving; R2 is greater than 2, and then motor just changes (with the numerical control system motor movement step number among the R2) (113), enters step 8; If A＞R0 enters next step (106);

Step 7 motor counter-rotating (with the numerical control system motor movement step number among the R2) (107);

After step 8 motion finishes, preserve current aperture position (number among the R0 is stored among the A) (108);

Advantage of the present invention is that the diaphragm drive system only drives electronic diaphragm and optical filter simultaneously by a driver part, and can guarantee that electronic diaphragm and optical filter coordination exercise are correct, puts in place precisely, has simplified drive circuit effectively, saves assembling.

Description of drawings

Fig. 1: be transmission structures schematic diagram of the present invention;

Fig. 2: be actuating device projection of the present invention;

Fig. 3: be actuating device step motor drive electrical schematic diagram of the present invention;

Fig. 4: be the electronic diaphragm control of actuating device of the present invention electrical schematic diagram;

Fig. 5: be control sequence flow chart of the present invention.

Among the figure: 1 motor, 2 pinions, 3 optical filters drive handle, 4 optical filters, 5 pins, 6 diaphragms, 7 diaphragm gears

The specific embodiment

Detailed structure of the present invention and operation principle are illustrated in conjunction with the accompanying drawings: fix a pinion 2 in motor 1 rotating shaft, gear 7 engagements on this gear 2 and the electronic diaphragm 6, to drive electronic diaphragm 6 blade movements, change diaphragm 6 apertures, optical filter 4 is connected with motor 1 rotating shaft, optical filter 4 can freely be rotated around motor 1 rotating shaft, optical filter 4 drives on the handle and has slotted hole, be fixed with pin on the diaphragm gear, cooperate with the optical filter slotted hole, to reach the interlock of optical filter 4 and electronic diaphragm 6, in the singlechip CPU memory, there is control sequence, realize electronic diaphragm and the work of optical filter automatic synchronization in the X line machine image system by control sequence, guarantee the image optimum effect.

Claims

1. electronic diaphragm actuating device in the X line machine image system, it is characterized in that this device is by motor (1), diaphragm (6), the execution unit that optical filter (4) is formed, control circuit and control sequence three parts are formed, wherein on motor (1) axle pinion (2) is housed in the execution unit, diaphragm gear (7) is equipped with in pinion (2) side, pinion (2) and diaphragm gear (7) engagement, diaphragm gear (7) connects with diaphragm (6) blade, on motor (1) axle, connect optical filter (4) simultaneously, optical filter (4) one ends can center on motor (1) axle and freely rotate, optical filter (4) other end is for driving handle (3), drive on the handle (3) and have slotted hole, be fixed with a vertical protrudent pin on the gear of electronic therewith diaphragm (6), be pin feature, realize the coordination linkage of electronic diaphragm (6) and optical filter (4).

2. by electronic diaphragm actuating device in the described a kind of X line machine image system of claim 1, it is characterized in that the aperture control circuit input is the Artificial Control input in the control circuit, form by four the tunnel, expose or pivot operation, wherein one the tunnel connects MUX MAX306, select corresponding control signal (0～5V voltage signal), control signal is reconciled through potentiometer, be connected to the stepper motor driving circuit input, MUX MAX306 outfan is reconciled through potentiometer, is the multi-channel test point; Another road connects the multichannel display lamp respectively by three Bunper assemblies, to show the location status of diaphragm.

3. by electronic diaphragm actuating device in the described a kind of X line machine image system of claim 1; it is characterized in that stepper motor driving circuit is core with CPUAT89C52; CPU input and A/D converter outfan join; and CPU output directly connects with the driven unit UP-4HB01 of motor by buffer DM7407 output, control step motor counting driving, freedom and guard mode.

4. by electronic diaphragm actuating device in the described a kind of X line machine image system of claim 1, it is characterized in that the control method of this program is made up of the following step:

Step 2 is opened the AD conversion, and data are stored in depositor R0 (102);

Does step 4 judge that R2 equals 0?, wherein R2 equals 0, and then motor does not move, and preserves the previous state aperture

Position (the previous state value is stored among the A) if R2 is not equal to 0, enters next step (104);

Does step 5 judge that R2 is smaller or equal to 2?, wherein R2＜=2 then enter not kinestate of motor, if R2＞2,

Enter next step (105);

Step 6 is laststate and current state aperture size (relatively size of data among A and the R0) relatively, judges motor

Rotating, A＜R0 wherein, with the several negates (111) among the R2, judge among the R2 number whether greater than

2? (112), R2 enters motor and does not move less than 2; State before preserving; R2 is greater than 2, then motor

Just change (with the numerical control system motor movement step number among the R2) (113), enter step 8; If A＞R0 advances

Go into next step (106);

After step 8 motion finishes, preserve current aperture position (number among the R0 is stored among the A) (108).