Patent ID: 7229750

Claim:
A silver halide emulsion, which is chemically sensitized by a compound represented by formula (1): E 1 -Ch-E 2 Formula (1) wherein, in formula (1), Ch represents a sulfur atom, a selenium atom or a tellurium atom; E 1 is a group selected from groups represented by formula (3), (4) or (5); and E 2 is a group selected from groups represented by formula (5); wherein, in formula (3), L 1 represents an aliphatic group having 2 to 20 carbon atoms; and EWG represents an electron withdrawing group; wherein, in formula (4), A 1 represents an oxygen atom, a sulfur atom or NR 7 ; and R 4 , R 5 , R 6 and R 7 each independently represent a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, or a heterocyclic group; or R 4 and R 5 , R 4 and R 6 , or R 4 and R 7 may bond together to form a ring; wherein, in formula (5), A 2 represents an oxygen atom, a sulfur atom, or NR 11 ; R 8 represents a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a heterocyclic group, or an acyl group; R 9 , R 10 , and R 11 each independently represent a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, or a heterocyclic group; X 1 represents a substituent; and n is an integer from 0 to 4; when n is 2 or more, X 1 s may be the same or different; and wherein when E 1 and E 2 each represent a group represented by the same formula, E 1 and E 2 may be the same or different.