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US 10,503,056 B2Granted
Projector and method of controlling projector that determines whether a lens has been replaced
AssigneeSeiko Epson Corporation
InventorYusuke Kudo
Life of this patent
Estimating the term…
Abstract
A projector includes a drive section adapted to move a projection lens, a projection section adapted to project image light through the projection lens, and a determination section adapted to determine whether or not the projection lens has been replaced based on a first position as a position of the projection lens at a first time point at which power supply to the projector is stopped, and a second position as a position of the projection lens at a second time point at which the power supply is started after the first time point.
Claims8
A projector comprising:
- a projection lens having a focus lens and a zoom lens;
- a drive section adapted to move the projection lens;
- a projection section adapted to project image light through the projection lens;
- a determination section adapted to determine whether or not the projection lens has been replaced based on:
- a first relationship between a position of the focus lens at a first time point at which power supply to the projector is stopped, and a position of the focus lens at a second time point at which the power supply is started after the first time point, and
- a second relationship between a position of the zoom lens at the first time point and a position of the zoom lens at the second time point;
- a detection section adapted to detect a position of the projection lens;
- and
- a projection control section adapted to make the projection section project a message for prompting a user to make the projector measure a relationship between an actual position of the projection lens and a position of the projection lens detected by the detection section in a case in which the determination section has determined that the projection lens has been replaced.
6 more elements
A method of controlling a projector, comprising:
- generating image light;
- projecting the image light through a projection lens which can be moved, the projection lens having a focus lens and a zoom lens;
- determining whether or not the projection lens has been replaced based on:
- a first relationship between a position of the focus lens at a first time point at which power supply to the projector is stopped, and a position of the focus lens at a second time point at which the power supply is started after the first time point, and
- a second relationship between a position of the zoom lens at the first time point and a position of the zoom lens at the second time point;
- detecting a position of the projection lens;
- and
- projecting a message for prompting a user to make the projector measure a relationship between an actual position of the projection lens and the detected position of the projection lens in a case in which it is determined that the projection lens has been replaced.
5 more elements
A projector comprising:
- a drive section adapted to move a projection lens which includes a focus lens and a zoom lens;
- a projection section adapted to project image light through the projection lens;
- a storage section which stores a first threshold value;
- a determination section adapted to determine whether or not the projection lens has been replaced based on a first distance between a first position and a second position being longer than the first threshold value, the first position being a position of the focus lens at a first time point at which power supply to the projector is stopped, the second position being a position of the focus lens at a second time point at which the power supply is started after the first time point;
- a detection section adapted to detect a position of the projection lens;
- and
- a projection control section adapted to make the projection section project a message for prompting a user to make the projector measure a relationship between an actual position of the projection lens and a position of the projection lens detected by the detection section in a case in which the determination section has determined that the projection lens has been replaced.
4 more elements
Dependencies are inferred from the claim text.