Laser-Rangefinding Sight With Off-Axis Display For Unobstructed FOV
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Solution Overview
Problem
Existing sights with LCD sighting display reticles obstruct the field of view (FOV), affecting sighting accuracy and dispersing the shooter's attention, and often limit the display to basic distance information.
Innovation Solution
A sight design with a reticle set comprising cemented prisms and a reflective film to superimpose reticle patterns and display information outside the main optical path, using a beam splitter prism to separate visible and invisible light paths, and incorporating a rangefinder assembly with a laser emitter and receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If an LCD sighting display reticle is provided on the focal plane of the eyepiece set, then ranging results can be displayed, but the LCD portion obstructs the field of view (FOV)
Solution Approach 1:
The display screen is repositioned from the focal plane (2D plane perpendicular to optical axis) to the reticle plane (another 2D plane in the optical path). By changing the spatial dimension where the display is located, the patent allows the display to be positioned at the reticle plane where it can be superimposed with the reticle pattern without obstructing the FOV, as both are viewed simultaneously at the same plane rather than the display being in the way at the focal plane
2Loss of information
If an LCD sighting display reticle is provided on the focal plane, then ranging information can be shown, but sighting accuracy is affected and shooter attention is dispersed
Solution Approach 1:
The patent merges the display function with the reticle function by positioning the display screen at the reticle plane and using a beam splitter to superimpose the displayed ranging information with the reticle pattern. This combination allows both the reticle and display to be viewed simultaneously without the display obstructing the reticle or the FOV, thereby maintaining sighting accuracy while providing ranging information
Solution Approach 2:
The beam splitter acts as an intermediary optical element that allows the display screen to be positioned at the reticle plane while still enabling the FOV to be unobstructed. The beam splitter separates the optical paths so that light from the display screen and light from the FOV can both reach the eye simultaneously, mediating between the display requirement and the unobstructed viewing requirement
3Adaptability or versatility
If a beam splitter prism is used to separate visible and invisible light paths, then laser rangefinding can be integrated, but device complexity increases
Solution Approach 1:
The beam splitter prism is designed to perform multiple functions: it separates the invisible laser light from the visible light path, allows the laser light to pass through to the target while reflecting the visible light to the display screen, and integrates both rangefinding and sighting functions into a single optical system. This multi-functionality reduces the need for separate components and simplifies the overall device structure
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
Ensures unobstructed FOV, maintains sighting accuracy, allows for comprehensive parameter display, and facilitates quick, comfortable sighting by concentrating attention on the target.
Implementation Method 1
a reflective film is provided on a first cemented plane of the first prism and the second prism; the reflective film is configured to reflect light from the display screen to the eye side
Implementation Method 2
the beam splitter prism has a third incident plane, a third reflecting plane, and a third exit plane; the second reflecting plane or the third incident plane is provided with a first beam splitting film; the first beam splitting film is configured to reflect visible light and allow invisible light to penetrate through
Implementation Method 3
the rangefinder assembly includes a laser emitter provided outside the housing, and a laser receiver provided in the housing
Implementation Method 4
a laser emitter provided outside the housing, and a laser receiver provided in the housing
Implementation Method 5
at least one of the first incident plane, the first exit plane, the second incident plane, the second exit plane, and the third exit plane is provided with an anti-reflective film
Data Source
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AI summary
The present application relates to the field of gun sighting, and provides a sight. The sight includes a housing, a rangefinder assembly, a display screen provided in the housing and electrically connected to the rangefinder assembly, as well as an objective lens set, an image inverter set, a reticle set, and an eyepiece set provided in the housing and sequentially arranged from an object side to an eye side, where the reticle set includes a first prism and a second prism cemented to each other; a reflective film is provided on a first cemented plane of the first prism and the second prism; the first prism has a first plane provided on an imaging plane; the second prism has a second plane perpendicular to the first plane; the first plane is provided with a reticle pattern; a light-emitting plane of the display screen is attached to the second plane; and the reflective film is configured to reflect light from the display screen to the eye side. The display screen is skillfully provided outside a main optical path. Through the reflective film on the first cemented plane of the first prism and the second prism, parameter information displayed by the display screen is superimposed with an erect target image and the reticle pattern for projecting. Therefore, the sight ensures a sighting definition, and does not cause obstruction to a field of view (FOV).