Abstract: A photosensitizer is a dye represented by the following formula (I) or its salt. In the following chemical formula, m represents an integer of 0 through 4, and n represents an integer of 0 or 1, and p represents an integer of 0 to 2. R1, R2 and R3 represent a hydrogen atom, an alkyl group, an aryl group or the like. R4, R4?, R4?, R5, R6, R7, R8 and R9 represent a hydrogen atom, an alkyl group and the like. X represents a carbonyl group or the like.

Abstract: A photosensitizer is a dye represented by the following formula (I) or its salt. In the following chemical formula, m represents an integer of 0 through 4, and n represents an integer of 0 or 1, and p represents an integer of 0 to 2. R1, R2 and R3 represent a hydrogen atom, an alkyl group, an aryl group or the like. R4, R4?, R4?, R5, R6, R7, R8 and R9 represent a hydrogen atom, an alkyl group and the like. X represents a carbonyl group or the like.

Abstract: An object of the present invention is to provide an on-surface sound pickup microphone that is made wireless by eliminating the need for a cable for connection to a receiver. An on-surface sound pickup microphone 1 includes a flat microphone case 10 including a base portion 20 that has a flat bottom surface and a porous sound pickup cover 23 that covers a top surface of the base portion 20. The microphone case contains a microphone unit and a sound signal output circuit for the microphone. In the on-surface sound pickup microphone 1 has a battery housing portion 220 in which a battery as a power source is housed, and a light emitting portion 230 serving as transmission means for the sound signal output circuit to radiate infrared rays emitted by the infrared light emitting element, to the outside of the microphone; the light emitting portion 230 consists of, for example, a diffusion lens.