Culture apparatus

1. A culture apparatus comprising:

a housing including a culture chamber inside, culture being cultured in the culture chamber;

a door configured to seal the culture chamber;

an ultraviolet lamp configured to generate an ultraviolet ray for disinfecting air in the culture chamber;

a lighting device configured to allow the ultraviolet lamp to be on for a predetermined time period, when the air in the culture chamber is disinfected;

a detecting device configured to detect deterioration of disinfection capability of the ultraviolet lamp; and

a controller configured to correct the predetermined time period, during which the ultraviolet lamp is on, so as to be longer according to the deterioration of the disinfection capability of the ultraviolet lamp detected by the detecting device, wherein

the detecting device outputs as the detection result an accumulated time period obtained by accumulating a lighting time period of the ultraviolet lamp,

the controller controls the lighting device so that the predetermined time period is set longer as the accumulated time period becomes longer, and

the controller controls the lighting device so that the predetermined time period is set longer in a stepwise manner each time the accumulated time period reaches a predetermined time period.

2. The culture apparatus according to claim 1 , wherein the ultraviolet ray has a wavelength at which generation of ozone is suppressed.

3. The culture apparatus according to claim 1 , further comprising a switch configured to detect whether the door is open or closed, wherein lighting of the ultraviolet lamp is started when closing of the door is detected by the switch.