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US 10,897,604 B2Granted
Abnormality detection unit, projector, abnormality detection method, and recording medium
AssigneeCasio Computer Co., Ltd.
InventorsKoichi Kato, Tomoya Makino, Akira Inoue
Life of this patent
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Abstract
An abnormality detection unit includes a light source device configured to emit light for each of segment periods that are time divided in a frame and an illuminance value obtaining unit configured to obtain an illuminance value of light emitted from the light source device and determines that the light source device is abnormal when all illuminance values obtained at the segment periods are less than a threshold.
Claims10
An abnormality detection unit comprising:
- a processor;
- a light source device that emits light, one frame period being time divided into segment periods so that the light source emits light of a wavelength range in each segment period with the wavelength range of the emitted light being different in each of the segment periods;
- and
- an illuminance sensor for detecting an illuminance value of light emitted from the light source device,
- wherein the processor obtains an illuminance value detected by the illuminance sensor from the illuminance sensor during each of the segment periods, and the processor determines that the light source device is in an abnormal state, i) when each of the illuminance values obtained during each of the segment periods in the one frame period are less than a threshold value which is set to a common value during each of the segment periods, or ii) when each of the illuminance values obtained during each of the segment periods in the one frame period is equal to or greater than the threshold value,
- on the other hand, the processor determines that the light source device is in a normal state when any one or more of the illuminance values obtained during each of the segment periods in the one frame period are less than the threshold value and any one or more of the illuminance values are greater than the threshold value, and
- the processor determines the abnormal state as a state in which an optical member of the light source unit is in positional deviation or the optical member is removed.
4 more elements
An abnormality detection method executed by an abnormality detection unit comprising:
- a light source device that emits light, one frame period being time divided into segment periods so that the light source emits light of a wavelength range in each segment period with the wavelength range of the emitted light being different in each of the segment periods;
- and
- an illuminance sensor for detecting an illuminance value of light emitted from the light source device,
- the abnormality detection method comprising:
- an obtaining step of obtaining an illuminance value detected by the illuminance sensor from the illuminance sensor during each of the segment periods;
- and
- a determining step of determining that the light source device is in an abnormal state, i) when each of the illuminance values obtained during each of the segment periods in the one frame period are less than a threshold value which is set to a common value during each of the segment periods, or ii) when each of the illuminance values obtained during each of the segment periods in the one frame period is equal to or greater than the threshold value,
- on the other hand, a determining step of determining that the light source device is in a normal state when any one or more of the illuminance values obtained during each of the segment periods in the one frame period are less than the threshold value and any one or more of the illuminance values are greater than the threshold value,
- wherein the determining step determines the abnormal state as a state in which an optical member of the light source unit is in positional deviation or the optical member is removed.
6 more elements
A recording medium recording in it a program executable by an abnormality detection unit comprising:
- a light source device that emits light, one frame period being time divided into segment periods so that the light source emits light of a wavelength range in each segment period with the wavelength range of the emitted light being different in each of the segment periods;
- and
- an illuminance sensor for detecting an illuminance value of light emitted from the light source device, and readable by a computer, the program being configured to realize:
- an illuminance value obtaining function of obtaining an illuminance value detected by the illuminance sensor from the illuminance sensor during each of the segment periods;
- and
- a determining function of determining that the light source device is in an abnormal state, i) when each of the illuminance values obtained during each of the segment periods in the one frame period are less than a threshold value which is set to a common value during each of the segment periods, or ii) when each of the illuminance values obtained during each of the segment periods in the one frame period is equal to or greater than the threshold value,
- on the other hand, a determining function of determining that the light source device is in a normal state when any one or more of the illuminance values obtained during each of the segment periods in the one frame period are less than the threshold value and any one or more of the illuminance values are greater than the threshold value,
- wherein the determining function determines the abnormal state as a state in which an optical member of the light source unit is in positional deviation or the optical member is removed.
5 more elements
Dependencies are inferred from the claim text.