Range Finder Lens Assembly with Prism and Multilayer Film
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Solution Overview
Problem
Conventional range finders with displays struggle to provide bright and clear target information without affecting the background color and visual effect.
Innovation Solution
A range finder and lens assembly that includes a display, a lens assembly, and a prism assembly with an optical multilayer film, which enhances the brightness of the display while maintaining the background color by optimizing the optical path and energy distribution through specific geometric and focal length conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional display structures are used in range finders, then the structure is simple and easy to manufacture, but the display brightness is insufficient and the visual effect is degraded
Solution Approach 1:
The patent integrates the display screen, lens assembly, and prism assembly into a nested structure where the display is positioned behind the lens, and the prism is integrated within the optical path. This nesting approach increases display brightness by optimizing light utilization while maintaining a compact form factor without proportionally increasing overall device complexity
Solution Approach 2:
The patent introduces a wavelength-selective film as an intermediary element between the display and the optical path. This film selectively transmits certain wavelengths while reflecting others, enabling the system to enhance display brightness by directing specific light wavelengths to the target while maintaining background color fidelity, thus resolving the brightness-enhancement problem without requiring complete redesign of the optical system
2Illumination intensity
If conventional optical paths are used, then the optical path is simple, but the display brightness cannot be increased without affecting the background color
Solution Approach 1:
The patent applies local quality by using a wavelength-selective film with specific spectral characteristics positioned at a particular location in the optical path. This film has different transmission and reflection properties for different wavelengths, allowing the system to enhance display brightness for specific wavelengths while maintaining background color appearance, thus achieving localized optimization without complicating the entire optical assembly
Solution Approach 2:
The patent changes optical parameters by introducing a wavelength-selective film with specific transmission and reflection characteristics. By adjusting the spectral properties of this film and optimizing its position in the optical path, the system achieves enhanced display brightness while maintaining background color fidelity, resolving the contradiction between brightness enhancement and manufacturing simplicity
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 effectively increases the visual brightness of the display without altering the background color, thereby improving the overall visual effect.
Implementation Method 1
A second light beam enters the first prism through the first surface are totally reflected from the second surface to the optical multilayer film
Implementation Method 2
the optical multilayer film reflects a part of the second light beam causing the part of the second light beam to exit the first prism by the second surface
Implementation Method 3
the optical multilayer film allows a part of the first light beam to pass through
Data Source
AI summary
A lens assembly for display includes a display, a lens assembly, and a prism assembly. The display emits a first light beam. The lens assembly includes a first, second, and third lenses. The prism assembly includes a first, second prisms, and an optical multilayer film, wherein the first prism includes a first, second, and third surfaces and the second prism includes a fourth, fifth, sixth, seventh, and eighth surfaces. The lens assembly for display satisfies at least one of following conditions: 0.60≤Din/TTL≤0.75; 0.28≤Din/f123≤0.35; 4.56 mm≤Din≤5.02 mm; wherein Din is an effective optical diameter of the light incident surface, TTL is an interval from the light incident surface to the light emitting surface along the optical axis, and f123 is an effective focal length of a combination of the first lens, the second lens, and the third lens.