Patent Number: 
Section: claims

1. A radiography apparatus equipped with a radiation source configured to irradiate radiation toward a subject, the radiography apparatus comprising:a light source configured to illuminate an irradiation field of the radiation with visible light; anda control board configured to:control lighting of the light source;limit a lighting time of the light source; anddistinguish a type of the light source connected to a device body,wherein the control board changes the lighting time based on a result of the distinguishing. 2. The radiography apparatus as recited in claim 1, wherein the control board is configured to detect that the light source is connected to the device body. 3. The radiography apparatus as recited in claim 1, wherein the control board is dedicated to the type of the light source for lighting the light source. 4. The radiography apparatus as recited in claim 1, wherein the control board is configured to limit a lighting time of the light source to prevent the radiography apparatus from exceeding a predetermined temperature. 5. A radiography apparatus equipped with a radiation source configured to irradiate radiation toward a subject, the radiography apparatus comprising:a light source configured to illuminate an irradiation field of the radiation with visible light; anda control board configured to:control lighting of the light source;limit a lighting time of the light source; anddistinguish a type of the light source connected to a device body,wherein the control board disables the lighting time limitation when the light source is distinguished as a semiconductor light source by a result of the distinguishing. 6. The radiography apparatus as recited in claim 5,wherein the control board detects that the light source is connected to the device body. 7. The radiography apparatus as recited in claim 5,wherein the control board is dedicated to the type of the light source for lighting the light source. 8. The radiography apparatus as recited in claim 5, wherein the control board is configured to limit a lighting time of the light source to prevent the radiography apparatus from exceeding a predetermined temperature. 9. A radiography apparatus equipped with a radiation source configured to irradiate radiation toward a subject, the radiography apparatus comprising:a light source configured to illuminate an irradiation field of the radiation with visible light; anda control board configured to:control lighting of the light source;limit lighting power of the light source; anddistinguish a type of the light source connected to a device body,wherein the control board changes the lighting power based on a result of the distinguishing. 10. The radiography apparatus as recited in claim 9,wherein the control board detects that the light source is connected. 11. The radiography apparatus as recited in claim 9,wherein the control board is dedicated to the type of the light source for lighting the light source. 12. The radiography apparatus as recited in claim 9, wherein the control board is configured to limit a lighting power of the light source to prevent the radiography apparatus from exceeding a predetermined temperature. 13. A radiography apparatus equipped with a radiation source for irradiating radiation toward a subject, the radiography apparatus comprising:a light source configured to illuminate an irradiation field of radiation with visible light; anda control board configured to:control lighting of the light source;limit lighting power of the light source; anddistinguish a type of the light source connected to a device body,wherein the control board disables the lighting power limitation when the light source is distinguished as a semiconductor light source by a result of the distinguishing. 14. The radiography apparatus as recited in claim 13,wherein the control board detects that the light source is connected. 15. The radiography apparatus as recited in claim 13,wherein the control board is dedicated to the type of the light source for lighting the light source. 16. The radiography apparatus as recited in claim 13, wherein the control board is configured to limit a lighting power of the light source to prevent the radiography apparatus from exceeding a predetermined temperature.