WHICH TRANSDUCER AM I? Crossword

I cause a horizontal drop_out when one of my crystals is damaged
I cause a vertical drop-out when one of my crystals is damaged, and I form a blunted image
if you damage my crystal, I will not give you an image at all
In a game of darts you aim for the "______"; which is also my appearance
my active elements want to be archers. They brought arrows and their _____ (which is how they are shaped).
I've got tiny feet, but up to 300 elements on my face
I always mean "adjustable" or "multi-focus"
If the pattern I transmit is curved then my beam is?
If the pattern I transmit is sloped than my beam is?
Focusing can occur not only during transmission, but also reception.