Projector Optical Device Rotation Mechanism
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Solution Overview
Problem
Existing projectors face reliability issues and improper projection due to complex configurations and the need for manual adjustment of the projection optical device, which can lead to unintended movement and misalignment under impact, and the challenge of maintaining the light modulating device within the back focus position during position adjustments.
Innovation Solution
A projector design featuring a rotating member supported by a motor-driven spindle along the rotation axis, a transmission device with a worm gear mechanism, and biasing members to maintain alignment and prevent rattling, allowing for stable adjustment of the projection optical device's inclination and position without applying loads along the central axis, ensuring the light modulating device remains within the back focus range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the spindle of the motor is disposed coaxially with the adjusting screw, then automatic inclination adjustment is achieved, but the configuration becomes complicated and the first moving member may rotate under impact
Solution Approach 1:
The patent introduces a transmission device as an intermediary between the motor and the rotating member. The motor rotates a first member, which then drives the rotating member through the transmission device (worm gear mechanism). This intermediary structure allows the motor to be disposed separately from the rotating member, simplifying the overall configuration while maintaining automatic adjustment capability and preventing direct impact transmission to the rotating member.
2Ease of operation
If the first moving member is moved in the left-and-right direction and rotated about the first guide bar, then the projection optical device can be inclined, but the back focus position shifts and proper projection cannot be ensured
Solution Approach 1:
The patent segments the adjustment functions into independent components: a rotating member for inclination adjustment and a moving member for position adjustment. The rotating member rotates about a rotation axis that is positioned to prevent back focus shifts, while the moving member handles positional adjustments. This segmentation allows each component to perform its specific function without interfering with the back focus position, ensuring both ease of operation and projection precision.
3Device complexity
If manual adjustment of the projection optical device is required, then the structure can be simple, but the adjustment process is inconvenient and time-consuming
Solution Approach 1:
The patent implements self-service adjustment through an automatic inclination adjustment mechanism. The system includes a sensor that detects the inclination state of the projection optical device and automatically controls the rotating member to adjust the inclination. This eliminates the need for manual adjustment operations, saving time and effort while maintaining a relatively simple overall structure. The system serves itself by automatically detecting and correcting inclination deviations.
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
The solution enhances the projector's reliability by preventing unintended movement and maintaining proper alignment, ensuring stable operation and effective projection even under impact, while simplifying the adjustment process and reducing the risk of misalignment and back focus position shifts.
Implementation Method 1
The elastic member is a spring through which the shaft of the adjusting screw is inserted, and is disposed between the first engaging member and the second engaging member. When the adjusting screw is rotated, a gap in a direction along the optical axis between the first engaging member and the second engaging member is changed by an elastic force of the elastic member and a pressure applied by the adjusting screw
Implementation Method 2
the transmission device includes a worm that is connected to the spindle, a worm wheel that meshes with the worm
Data Source
AI summary
A projector includes a light source device, a light modulating device, a projection optical device, and an adjusting device that rotates the projection optical device about a rotation axis along a direction orthogonal to a central axis of the projection optical device. The adjusting device includes a rotating member that supports the projection optical device and rotates about the rotation axis, a support member that supports the rotating member, and a drive device that rotates the rotating member. The drive device includes a motor and a transmission device that rotates the rotating member with power of the motor. The motor includes a spindle that transmits the power to the transmission device. The spindle is disposed along the rotation axis.