Image projector
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsSatoshi Kuzuhara, Hiroaki Okayama, Toshiya Mori
Life of this patent
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Abstract
A head-up display includes a display device and a projection optical system. The projection optical system has a lens group including at least one lens element and projects onto a reflecting member an image displayed on the display device. The lens group includes a drive lens that shifts along an optical path to change its distance from the display device.
Claims7
An image projector that projects an image onto a transmissive reflecting member to allow a viewer to visually recognize a virtual image, the image projector comprising:
- a display device that displays an image;
- and
- a projection optical system that projects onto the transmissive reflecting member the image displayed on the display device, the projection optical system including a lens group that includes at least one lens element,
- wherein the lens group includes at least one drive lens that shifts along an optical path to change the distance from the drive lens to the display device, and
- wherein the image projector satisfies the following condition (1):
- 1<ΔD/ΔL<50 (1)
- where
- ΔD is 1/Z1−1/Z2,
- Z1 is a sight distance of a virtual image before the drive lens is shifted,
- Z2 is a sight distance of the virtual image after the drive lens is shifted, and
- ΔL is a shift amount of the drive lens.
An image projector that projects an image onto a transmissive reflecting member to allow a viewer to visually recognize a virtual image, the image projector comprising:
- a display device that displays an image;
- and
- a projection optical system that projects onto the transmissive reflecting member the image displayed on the display device, the projection optical system including a lens group that includes at least one lens element,
- wherein the lens group includes at least one drive lens that shifts along an optical path to change the distance from the drive lens to the display device, and
- wherein the image projector satisfies the following condition (1):
- 1<ΔD/ΔL (1)
- where
- ΔD is 1/Z1−1/Z2,
- Z1 is a sight distance of a virtual image before the drive lens is shifted,
- Z2 is a sight distance of the virtual image after the drive lens is shifted, and
- ΔL is a shift amount of the drive lens, and
- wherein the image projector satisfies the following condition (3):
- ΔL/ΔM<30 (3)
- where
- ΔM is a shift amount of the image displayed in a display area of the display device.
An image projector that projects an image onto a transmissive reflecting member to allow a viewer to visually recognize a virtual image, the image projector comprising:
- a display device that displays an image;
- and
- a projection optical system that projects onto the transmissive reflecting member the image displayed on the display device, the projection optical system including a lens group that includes at least one lens element,
- wherein the lens group includes at least one drive lens that shifts along an optical path to change the distance from the drive lens to the display device, and
- wherein the image projector satisfies the following condition (1):
- 1<ΔD/ΔL (1)
- where
- ΔD is 1/Z1−1/Z2,
- Z1 is a sight distance of a virtual image before the drive lens is shifted,
- Z2 is a sight distance of the virtual image after the drive lens is shifted, and
- ΔL is a shift amount of the drive lens, and
- wherein the image projector satisfies the following condition (4):
- ΔN<2 (4)
- where
- ΔN is X1/X2
- X1 is a horizontal size of the image displayed in the display device before the drive lens is shifted, and
- X2 is a horizontal size of the image displayed in the display device after the drive lens is shifted.
Dependencies are inferred from the claim text.