Patent ID: 7946325

Claim:
A device for blocking an optical lens, comprising a lens holding tool to which the optical lens is to be fixed through a bonding agent, characterized by comprising: a loading table on which the optical lens is to be placed with a concave surface thereof facing up; a centering device which causes a geometric center of the optical lens to coincide with a center of said loading table; a dripping device which drips the bonding agent onto the concave surface of the optical lens; a moving device which moves the optical lens to a block position of said lens holding tool; and a gap setting device which moves said lens holding tool and the optical lens in directions to relatively approach each other to set a predetermined gap therebetween, so that the bonding agent is spread, wherein a dripping amount Q of bonding agent is calculated by the following equation: Q = π ⁢ ⁢ TeDh 2 + π ⁡ [ - 1 3 ⁢ ( R - R 2 - Dh 2 ) 3 + R ⁡ ( R - R 2 - Dh 2 ) 2 ] - π ⁡ [ - 1 3 ⁢ ( Ch - Ch 2 - Dh 2 ) 3 + Ch ⁡ ( Ch - Ch 2 - Dh 2 ) 2 ] where where Te is the thickness of the peripheral portion of the bonding agent after spreading, Ch is the radius of curvature of a blocking surface of said lens holding tool, R is the radius of curvature of the concave surface of the optical lens, and 2Dh is the diameter of the bonding agent after spreading.