Laser Projection Apparatus Asymmetric Lens Array
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Solution Overview
Problem
Conventional laser projection apparatuses face a challenge in reducing the overall volume while maintaining light usage efficiency, as directly reducing the diameter of the projection lens significantly decreases brightness and quality due to the symmetrically circular laser spot.
Innovation Solution
The design includes a laser set with a condensing lens, a reflecting unit, a reflecting diffuser, a first lens array, and an imaging module, where the length of the first lens array is less than or equal to half of the condensing lens's diameter, and its width is equal to or less than the diameter, allowing for an elliptical laser spot and minimizing the impact on light usage efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the diameter of the projection lens is reduced to decrease the overall volume, then the volume of the laser projection apparatus is reduced, but the light usage efficiency and projection brightness are significantly decreased
Solution Approach 1:
The patent applies asymmetry by changing the laser spot shape from a symmetric circular pattern to an elliptical pattern. The lens array is designed with specific dimensional relationships (length ≤ half the condensing lens diameter, width ≤ condensing lens diameter) to generate this elliptical spot, which allows for more efficient light utilization within the reduced lens diameter while maintaining projection brightness.
2Volume of stationary object
If the diameter of the projection lens is reduced to decrease the overall volume, then the volume of the laser projection apparatus is reduced, but the light usage efficiency is significantly decreased
Solution Approach 1:
The patent transforms the symmetric circular laser spot into an elliptical spot through asymmetric lens array design. This elliptical spot shape allows the laser light to be more effectively distributed across the projection lens aperture, improving light usage efficiency even when the lens diameter is reduced for compactness.
Solution Approach 2:
The patent changes the geometric parameters of the laser spot from circular to elliptical by controlling the dimensions of the lens array relative to the condensing lens diameter. Specifically, the length of the lens array is set to be less than or equal to half the condensing lens diameter, and the width is set to be less than or equal to the condensing lens diameter, which generates the desired elliptical spot pattern that improves light utilization efficiency.
3Volume of stationary object
If a lens reducing design is adopted to decrease the overall volume, then the volume of the laser projection apparatus is reduced, but the projection quality is significantly affected
Solution Approach 1:
The patent uses asymmetric lens array design to create an elliptical laser spot pattern that maintains projection quality while enabling reduced lens diameter. The specific dimensional constraints on the lens array ensure that the elliptical spot efficiently fills the projection lens aperture, preserving image quality and avoiding the degradation associated with conventional circular spot reduction designs.
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 maintains light usage efficiency and increases flexibility in lens size selection, achieving an elliptical laser spot within the projection lens while reducing the overall volume of the apparatus.
Implementation Method 1
a condensing lens (14) having a first lens portion (32) and a second lens portion (34)
Implementation Method 2
a reflecting unit (16) obliquely disposed on a light-entrance axis I of the first lens portion (32) and opposite to the plurality of first lighting units (26) for reflecting the first color light (L1) to be incident to the first lens portion (32) along the light-entrance axis I
Implementation Method 3
a reflecting diffuser (18) disposed at a side of the condensing lens (14), for receiving the first color light (L1) transmitted from the first lens portion (32) and reflecting the first color light (L1) to the second lens portion (34), to make the first color light (L1) travel along a light-exit axis O of the second lens portion (34)
Implementation Method 4
A first lens array (20) is disposed on the light-exit axis O, for receiving the first color light (L1) transmitted from the second lens portion (34)
Implementation Method 5
An imaging module (22) is disposed on the light-exit axis O, for receiving the first color light (L1) transmitted from the first lens array (20) to form a projection beam (B)
Implementation Method 6
A projection lens (24) receives the projection beam (B) transmitted from the imaging module (22) for optical projection
Data Source
AI summary
A laser projection apparatus includes a reflecting unit, a reflecting diffuser, a first lens array having a length and a width, a condensing lens having first and second lens portions and first and second center axes, a laser set emitting a first color light, an imaging module, and a projection lens. The reflecting unit reflects the first color light to the first lens portion. The reflecting diffuser reflects the first color light to travel along a light-exit axis of the second lens portion. The first lens array is disposed on the light-exit axis. The length along the first center axis and the width along the second center axis are less than or equal to one half of a diameter of the condensing lens and the diameter, respectively. The imaging module is disposed on the light-exit axis. The imaging module and the projection lens receive the first color light sequentially.