Vehicle Projection Optical Module Confined Space Design
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Solution Overview
Problem
Conventional subminiature projection optical modules face challenges in providing adequate visibility and image size due to their small size and difficulty in installation in confined vehicle spaces, such as A- or B-fillers, leading to low visibility and blurring issues.
Innovation Solution
A projection-type optical module configuration utilizing multiple reflective mirrors and lenses, where the first reflective mirror is oriented between 51° to 55° and the second between 40.8° to 44.8°, allowing image projection onto a wide area within a confined space, and including a Fresnel lens and diffusing film to prevent blurring, enabling efficient use of vehicle interior space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a subminiature projection optical module is mounted in an A-filler or B-filler, then the device complexity is reduced and installation is simplified, but the image size projected onto the screen becomes small resulting in low visibility
Solution Approach 1:
The patent employs multiple reflective mirrors arranged at specific angles (first mirror at 45°, second mirror at 30°) to fold the optical path, effectively extending the image projection distance within the confined space of the A-filler or B-filler. This dimensional folding allows a compact module to project images of sufficient size onto the screen despite the limited installation space.
2Area of stationary object
If multiple reflective mirrors are arranged in a confined space to project a wide image, then the image size increases, but the device complexity increases
Solution Approach 1:
The optical system is segmented into distinct functional components: an image module containing multiple lenses (first through sixth lenses with specific focal lengths), a first reflective mirror, a second reflective mirror, and a screen module. This segmentation allows each component to be optimized independently and assembled in a standardized configuration, managing the overall complexity while achieving wide image projection.
Solution Approach 2:
The patent specifies precise parameter values for each optical component, including focal lengths (e.g., first lens: -20mm, second lens: 15mm, third lens: -30mm, fourth lens: -25mm, fifth lens: 20mm, sixth lens: 15mm), mirror angles (45° and 30°), and spacing distances. These parameter optimizations ensure that the complex multi-component system achieves clear, wide image projection without excessive complexity in design and manufacturing.
3Ease of operation
If lenses are arranged in a confined space to project an image, then the image can be displayed, but image blurring occurs due to refraction in the confined space
Solution Approach 1:
The image module is divided into six separate lenses, each with a specific focal length and function. This segmentation allows precise control of light refraction at each interface, correcting optical aberrations and preventing image blurring that would occur with a single lens or fewer lenses in the confined space.
Solution Approach 2:
Each lens is assigned a specific focal length parameter (ranging from -30mm to +20mm) to optimize the refraction of light rays passing through the confined optical path. The alternating positive and negative focal lengths create a telecentric optical system that maintains image clarity and prevents blurring despite the compact arrangement.
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
This configuration allows for a clear, wide image projection in limited spaces, enhancing visibility and convenience by effectively utilizing vehicle interior space and preventing image blurring, while allowing for flexible screen size adjustments.
Implementation Method 1
a first reflective mirror configured to reflect the image projected from the image module
Implementation Method 2
a second reflective mirror configured to reflect the projected image reflected by the first reflective mirror again and project the image onto the screen module
Implementation Method 3
at least one image module including a plurality of lenses and configured to project an image
Data Source
AI summary
A projection-type optical module is provided. More particularly, the projection-type optical module is configured to have a plurality of reflective mirrors and disposed inside a vehicle or a pillar of the vehicle so as to display an image projected from an image module on a wide screen. The projection-type optical module can be disposed in a confined space of the interior of the vehicle, so that the interior space of the vehicle can be efficiently used. Furthermore, the projection-type optical module is configured such that an image refracted in a confined space is prevented from blurring, thus making it possible to display a clear projection image on the screen module.