The point source structure of the x ray collimator is the light characteristic of the beam limiter. When the light illumination field indicator lamp is installed in the beam limiter, it shows the exact illumination area when the required distance from the focus to the installation plane is observed.
In the point source structure of the beam limiter, there is a switch to control the on-off of the indicator lamp on the beam limiter. The self-closing lamp device is used to automatically turn off the lamp at a predetermined time after opening. It will reduce the operation steps, avoid forgetting and prolong the lamp life. There are two kinds of common automatic shut-off devices: mechanical and electronic. Mechanical automatic light-closing device is divided into knob type and button type. The duration of the light is determined by the degree of turning the knob or pressing the button. Electronic automatic light-closing device uses an electronic timer. After adjusting the time limit, the light is automatically turned off by a button until a predetermined time. In the point source structure of the beam limiter, the light bulbs used for indicator lamps are mostly about 100W, low-voltage power supply. Halogen lamps are used for the former beam limiter lamps, and now more products are used for LED lamps.