Projection Optical System with Rotational Movement Unit for Portrait Image Orientation
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Solution Overview
Problem
Existing projection optical systems face challenges in projecting landscape and portrait images with the same size and orientation, leading to complicated operations and image size changes when rotating the projector or using reflection mirrors.
Innovation Solution
A projection optical system comprising a first optical system, reflection members, and a rotational movement unit that allows the optical axes to be adjusted in specific increments, enabling the projection of landscape and portrait images with the same size by rotating the second optical axis to 45° for portrait images, ensuring correct orientation without reducing the projection size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a reflection mirror is rotated by 90° within the horizontal plane to display portrait images as landscape images, then the projection direction is rotated by 90°, but it becomes necessary to rotate the projector itself by 90° to return the projection direction, making the operation complicated
Solution Approach 1:
The patent applies the dynamics principle by making the optical axis adjustable through rotational movement. The optical axis can be rotated in 45° increments around the first optical axis using a rotational movement unit, allowing the system to dynamically adapt its projection orientation without requiring physical rotation of the entire projector body. This resolves the contradiction by enabling orientation change through internal optical adjustment rather than external mechanical rotation.
2Ease of operation
If the image orientation on the image forming panel is rotated by 90° to match landscape image orientation, then portrait images can be displayed correctly, but the image is displayed on a reduced scale causing projection size to change between landscape and portrait images
Solution Approach 1:
The patent applies the parameter changes principle by adjusting the optical axis orientation in 45° increments rather than fixed 90° rotation. By rotating the optical axis to specific angles (including 45° and 135° positions), the system can project portrait images with correct orientation while maintaining consistent projection size. This is achieved by changing the optical parameters (axis angle) rather than simply rotating the image on the panel, which would cause size reduction.
3Volume of moving object
If a projection optical system uses a compact configuration with shortened focal length to achieve wide angle, then a lens on the magnification side becomes excessively large, but forming an intermediate image with a first optical system and re-forming with a second optical system can shorten the back focus and decrease lens diameter
Solution Approach 1:
The patent applies the segmentation principle by dividing the optical system into two separate optical systems: a first optical system that forms an intermediate image and a second optical system that re-forms the final image. This segmentation allows the first optical system to handle the wide-angle/short-focal-length requirement while the second optical system handles the projection magnification, thereby avoiding the need for an excessively large lens and reducing the overall back focus length.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables simple and compact operation for projecting landscape and portrait images with the same size, eliminating the need for projector rotation and maintaining consistent image size, thus enhancing usability and reducing operational complexity.
Implementation Method 1
a first reflection member that reflects light from the first optical system to form a second optical axis intersecting the first optical axis at 90°; a second reflection member that bends the second optical axis to form a third optical axis
Data Source
AI summary
A first optical system, a first mirror, a second optical system, a second mirror, and a third optical system are disposed in order on an optical axis from an image forming panel to a screen. A first optical axis of the first optical system, a second optical axis of the second optical system, and a third optical axis of the third optical system are formed in a U shape, and orientations of luminous fluxes of the first optical axis and the third optical axis are reversed. The first mirror, the second optical system, the second mirror, and the third optical system are held to make a second holding barrel with respect to the first optical system. The second holding barrel is rotationally moved in a rotational movement range of 45° with respect to a first holding barrel. In projecting portrait image instead of a landscape image, the second holding barrel is rotated in increments of 45° with respect to the first holding barrel.