Ask : Wide angle proximity sensor

hi. what kind of proximity sensor that have wide angle of detection range. i have tried using IR and Ultrasonic (PING) sensor but they cant detect small or sharp pointed edge such as chair legs. sometimes the robot can detect it, but theres 20-30% chance that the robot will hit it. I tried PIR too, but it only works on object that radiate heat. I dont need long range detection, 1 meter is enough.