초록 ▼

The present invention provides a lighting control circuit having a light sensor that outputs a first signal in response to being exposed to radiation. The lighting control circuit has a detection circuit that is coupled to the light sensor and is configured to generate a second signal from the first

The present invention provides a lighting control circuit having a light sensor that outputs a first signal in response to being exposed to radiation. The lighting control circuit has a detection circuit that is coupled to the light sensor and is configured to generate a second signal from the first signal. The lighting control circuit has a driver circuit that is coupled to the detection circuit and is configured to generate a third signal to control an illumination level of a light, wherein an amplitude of the third signal is varied in response to the second signal and a reference signal. The lighting control circuit also has a shifting reference circuit configured to shift a reference voltage of the driver circuit to compensate for a supplemental sunlight energy contributed to the ambient light in a room.

대표청구항 ▼

The present invention provides a lighting control circuit having a light sensor that outputs a first signal in response to being exposed to radiation. The lighting control circuit has a detection circuit that is coupled to the light sensor and is configured to generate a second signal from the first

The present invention provides a lighting control circuit having a light sensor that outputs a first signal in response to being exposed to radiation. The lighting control circuit has a detection circuit that is coupled to the light sensor and is configured to generate a second signal from the first signal. The lighting control circuit has a driver circuit that is coupled to the detection circuit and is configured to generate a third signal to control an illumination level of a light, wherein an amplitude of the third signal is varied in response to the second signal and a reference signal. The lighting control circuit also has a shifting reference circuit configured to shift a reference voltage of the driver circuit to compensate for a supplemental sunlight energy contributed to the ambient light in a room. tron beams emitted from said electron-emitting devices. 36. An image forming apparatus according to claim 34, wherein said plurality of electron-emitting devices are arranged into an array and are connected to m lines of X-direction wirings and n lines of Y-direction wirings, said wirings being electrically insulated from one another. 37. An image forming apparatus comprising at least one electron beam apparatus that comprises an enclosure in which an electron-emitting device is disposed, wherein said electron-emitting device has an electron-emitting region in which a material containing carbon exists, and wherein an interior of said enclosure is maintained under an atmosphere in which a partial pressure of residual carbon compounds is less than 1×10-8Torr. 38. An image forming apparatus according to claim 37, wherein said electron-emitting region is sandwiched between opposite electrodes. 39. An image forming apparatus according to claim 37, wherein