AUTO ADJUSTMENT OF LIGHT INTENSITY BASED ON AMBIENT LIGHT CONDITION ON MATERNAL-FETAL THERMAL PRINTER
Publication Date: 2017-Jun-12
The IP.com Prior Art Database
A system for auto adjustment of light intensity based on ambient light condition on maternal-fetal thermal printer is disclosed. The lighting intensity is automatically adjusted depending upon the ambient light conditions with the help of closed loop mechanism using light sensors and light emitting diode (LED) power controller.
The present disclosure relates generally to maternal and fetal monitor and more particularly to auto adjustment of light intensity based on ambient light condition on maternal-fetal thermal printer.
A portable maternal-fetal monitor comprises a touch screen user interface tablet footprint monitor. The maternal and fetal monitor provides accurate vital information about fetus and maternal health by monitoring fetal heart rate (FHR) and maternal blood pressure in labor and delivery (L&D) room.
Therefore, maternal-fetal monitor along with inputs from ultrasound and tocodynamometer (TOCO) transducer connects with thermal printer. The thermal printer then prints FHR wave form, uterine activity duration and frequency wave form parameters on cardiotocograph (CTG).
The thermal printer has a light source that helps clinicians to read CTG in low ambient light conditions. However, the main light source on CTG printer is a light-emitting diode (LED) or compact fluorescent lamp (CFL) with fixed intensity. The light source LED remains in two states either switched-on with full luminescence or switched-off.
The ambient light condition in hospital varies between rooms and at different time of a day. Therefore, the room becomes bright at daytime and dimly lit at night, as depicted in figure 1. Hence, the clinician and work has to suffer due to improper illumination and brightness. User may have to manually search and switch-on the light during low light conditions. However, the brightness of the light cannot be adjusted according to individual n...