Light projection device

A light projection device comprising:

• a tubular casing having a light-emitting part at one tube end;
• a light source configured with a light-emitting diode housed in the casing;
• and
• a light amount control mechanism positioned between the light source and the light-emitting part and controlling an amount of light output from the light-emitting part,
• the light amount control mechanism including:
• a rotating body provided inside the casing and supported on the casing such as to be rotatable around a tube axis of the casing,
• an operating part attached to the rotating body such as to allow for rotary operation of the rotating body from outside the casing,
• a variable resistor allowing for current adjustment to increase and decrease an amount of current applied to the light-emitting diode, and
• a link mechanism operably connecting the rotating body and the variable resistor such that a forward movement of the rotating body causes a movable part of the variable resistor to move in a direction in which the amount of current is increased and such that a backward movement of the rotating body causes the movable part of the variable resistor to move in a direction in which the amount of current is decreased.