Patent ID: 8243443
Filing Date: 2012-08-14
Classification: G02B,G06F

Abstract:
1. A filter comprising: a rectangular light-transmitting portion transmitting visible light; a first protruding portion and a second protruding portion that are provided respectively at a pair of outer edges opposed to each other among four sides constituting a periphery of the light-transmitting portion, and that protrude respectively from a first center line of an interval between the pair of outer edges in directions of the pair of outer edges; a third protruding portion that is provided at one outer edge orthogonal to the pair of outer edges among the four sides, and that protrudes from a second center line of the pair of outer edges in a direction of the one outer edge; and a fourth protruding portion that is provided at the other outer edge opposed to the one outer edge via the light-transmitting portion, and that protrudes from the second center line in a direction of the other outer edge.