Image projecting device with movable lens
View Patent ↗An image projecting device of the present invention includes an image display section for displaying an image, a projecting optical system for outputting the image along an optical path and projecting the image onto a projection surface, and a lens unit provided on any position on the optical path. The lens unit includes a lens section having a lens movable along at least two or more directions in a plane vertical to an optical axis of the projecting optical system, and a driving section having an actuator section for moving the lens section, and the actuator section is disposed so that a thrust line passes through a centroid of the lens section. The driving section moves the lens so as to tilt an optical axis of light emitted from the image display section, and move a display position of pixels on the projection surface composing the image displayed by the image display section.
1. An image projecting device, comprising:
an image display section for displaying an image;
a projecting optical system for outputting the image displayed by the image display section along an optical path and projecting the image onto a projection surface; and
a lens unit provided at a position that is on the optical path between the image display section and the projecting optical system, and is behind a prism of the image display section,
wherein
the lens unit includes a lens section having a lens movable along at least two or more directions in a plane vertical to an optical axis of the projecting optical system, and a driving section having an actuator section for moving the lens section, the actuator section disposed so that a thrust line passes through a centroid of the lens section, and
the driving section moves the lens so as to tilt an optical axis of light emitted from the image display section, and moves a display position of pixels on the projection surface, the pixels composing the image displayed by the image display section.
2. The image projecting device according to claim 1 , wherein the lens of the lens unit is a plano-convex lens, and a plano-concave lens fixed to the image display section is provided between the lens unit and the image display section, wherein a convex surface side of the plano-convex lens faces a concave surface side of the plano-concave lens.
3. The image projecting device according to claim 1 , wherein the lens of the lens unit is a plano-concave lens, and a plano-convex lens fixed to the image display section is provided between the lens unit and the image display section, wherein a concave surface side of the plano-concave lens faces a convex surface side of the plano-convex lens.
4. An image projecting device, comprising:
an image display section for displaying an image;
a projecting optical system for outputting the image displayed by the image display section along an optical path and projecting the image onto a projection surface; and
a lens unit provided at a position that is on the optical path between the image display section and the projecting optical system, and is behind a prism of the image display section,
wherein
the lens unit includes one lens movable along at least two or more directions in a plane vertical to an optical axis of the projecting optical system, and a driving section for moving the lens, and
the driving section moves the lens so as to tilt an optical axis of light emitted from the image display section, and moves a display position of pixels on the projection surface, the pixels composing the image displayed by the image display section.
5. The image projecting device according to claim 4 , wherein the lens of the lens unit is a plano-convex lens, and a plano-concave lens fixed to the image display section is provided between the lens unit and the image display section, wherein a convex surface side of the plano-convex lens faces a concave surface side of the plano-concave lens.
6. The image projecting device according to claim 4 , wherein the lens of the lens unit is a plano-concave lens, and a plano-convex lens fixed to the image display section is provided between the lens unit and the image display section, wherein a concave surface side of the plano-concave lens faces a convex surface side of the plano-convex lens.
7. An image projecting device, comprising:
an image display section for displaying an image;
a projecting optical system for outputting the image displayed by the image display section along an optical path and projecting the image onto a projection surface; and
a lens unit provided at a position that is on the optical path between the image display section and the projecting optical system, and is behind a prism of the image display section,
wherein the lens unit includes
a lens section having a lens and a lens holding section holding the lens, the lens movable along a first direction and a second direction vertical to the first direction in a plane vertical to an optical axis of the projecting optical system; and
a driving section having a first actuator section for moving the lens section along the first direction, and a second actuator section for moving the lens section along the second direction,
the lens unit is disposed so that a thrust line of each of the first and the second actuator sections passes through a centroid of the lens section having the lens and the lens holding section,
the driving section moves the lens so as to tilt an optical axis of light emitted from the image display section, and moves a display position of pixels on the projection surface, the pixels composing the image displayed by the image display section.