PROJECTION TYPE IMAGE DISPLAY APPARATUS
First Claim
1. A projection type image display apparatus comprising:
- a projection optical system that includes a focus lens whose position is movable along an optical axis;
a temperature sensor that measures a temperature in the vicinity of the projection optical system;
a memory that stores lens position data that represents a relationship between the temperature measured by the temperature sensor and the position of the focus lens;
a focus lens control portion that controls the position of the focus lens based on temperature information from the temperature sensor and the lens position data;
a determination portion that determines whether or not there is a movement of the focus lens that is not performed by the focus lens control portion; and
a lens position data correction portion that, in a case where the determination portion determines that there is a movement of the focus lens that is not performed by the focus lens control portion, corrects the lens position data based on a movement amount of the focus lens in the movement.
3 Assignments
0 Petitions
Accused Products
Abstract
A projection type image display apparatus (1) comprises a focus correction system (30). The system includes a temperature detection mechanism (16) for measuring temperature in the vicinity of a projection lens group (13), a correction amount calculation unit (18) for calculating a correction amount for correcting the focus shift caused by a temperature change, and a driving signal generation unit (19) for generating, based on the correction amount, a driving signal for driving a focus adjustment mechanism (15). If the user performs a focus adjustment using a focus operation input unit (23), a focus operation determination unit (21) determines that a focus adjustment has occurred independently of the focus correction system and changes a correction condition stored in a memory (20).
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Citations
14 Claims
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1. A projection type image display apparatus comprising:
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a projection optical system that includes a focus lens whose position is movable along an optical axis; a temperature sensor that measures a temperature in the vicinity of the projection optical system; a memory that stores lens position data that represents a relationship between the temperature measured by the temperature sensor and the position of the focus lens; a focus lens control portion that controls the position of the focus lens based on temperature information from the temperature sensor and the lens position data; a determination portion that determines whether or not there is a movement of the focus lens that is not performed by the focus lens control portion; and a lens position data correction portion that, in a case where the determination portion determines that there is a movement of the focus lens that is not performed by the focus lens control portion, corrects the lens position data based on a movement amount of the focus lens in the movement. - View Dependent Claims (2, 3, 4, 5, 12, 13, 14)
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6. A projection type image display apparatus that has a focus correction system which corrects a time-dependent change of a focus based on a specific physical amount, the projection type image display apparatus comprises a determination portion that determines whether or not there is a focus operation that is not performed by the focus correction system;
- wherein
in a case where the determination portion determines that there is the focus operation, the focus operation system changes a correction condition to a new condition to perform a correction. - View Dependent Claims (7, 8, 9, 10, 11)
- wherein
Specification