Disclosed are a flash unit, a camera and a camera flash system, and relates to the technical field of underwater photographic equipment, including a flash lamp, capable of illuminating an photographed object; a video lamp, having the functions of color temperature adjustment and full color gamut coverage by light; a camera body, taking photos for the illuminated object; a waterproof case; a flash trigger, capable of generating an optical signal; and a repeater, capable of receiving the optical signal from the flash trigger, and then encoding and transmitting a new high-power optical signal. According to the present disclosure, under the cooperation of components such as the flash trigger and the repeater, the optical signal can be transmitted wirelessly over long distance underwater, thus achieving the effect of using the flash and video lamps far away from the camera. The present disclosure has a broad market application prospect.

A camera with a simple and compact structure can emit light using a discharge tube. A camera includes a circuit board including a contact connected to a trigger coil, a discharge tube that can discharge electricity, a housing accommodating the discharge tube, a reflector being conductive, urged toward the housing, and attached to the housing, and a wire having an end electrically connected to the contact on the circuit board and a distal end with an exposed conductor. The housing is attached to the circuit board. The housing includes a receiving portion receiving the reflector, and a sidewall located lateral to the receiving portion and extending perpendicular to the circuit board. The sidewall of the housing has a cutout guiding the wire inside the housing and holding the wire to have the distal end of the wire held between the reflector and the receiving portion.

A camera module includes a lens module; a circuit board, disposed on the lens module, on which an image sensor is disposed; a light-emitting diode (LED) module disposed to be spaced apart from the circuit board; a post disposed between the circuit board and the LED module to support the LED module; and a first heat dissipation member disposed on the LED module.