Patent ID: 9095051
Filing Date: 2015-07-28
Classification: H05K,Y10T

Abstract:
1. A ceramic substrate for mounting an LED, the ceramic substrate comprising a through-hole for screw-fastening and a recessed portion for screw-fastening or position registration and which is provided on at least one edge surface of a circumference thereof, and wherein the ceramic substrate is a silicon nitride substrate having a plate thickness of 0.2 mm to 1 mm, a heat conductivity of 60 W/m·K or more and a 3 point bending strength of 600 MPa or more at ambient temperature, wherein the through-hole has a diameter of 1 mm to 5 mm, and a minimum distance from the through-hole to one edge of the ceramic substrate is 1 mm or more, and wherein a ratio of broken ceramic substrate is 5% or less when a screw fastening torque of 25 N·m is applied to the ceramic substrate.