Telescope Objective Lens Vibration Reduction Mechanism
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Solution Overview
Problem
Existing telescope optical systems face challenges in vibration reduction and focusing mechanisms, with previous solutions either complicating the mechanism or lacking essential components like the erection prism necessary for telescopes.
Innovation Solution
A telescope optical system comprising an objective lens with a first lens group having positive refractive power, a second lens group with negative refractive power, and a third lens group with positive refractive power, where focusing is achieved by moving the second lens group along the optical axis and image position adjustment is made by moving the third lens group perpendicular to the axis, satisfying the conditional expression 1.5 < f1/(−f2) < 4, and including an erecting prism for image conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vibration reduction lens is added to the telescope optical system, then vibration reduction capability is improved, but device complexity increases
Solution Approach 1:
The third lens group serves dual functions: it acts as a vibration reduction lens by moving perpendicular to the optical axis to compensate for hand-shake, and simultaneously serves as an image position adjustment mechanism. This multi-functionality eliminates the need for separate vibration reduction components, resolving the contradiction between vibration reduction capability and device complexity.
2Ease of operation
If focusing is achieved by moving a vibration reduction lens with negative power along the optical axis, then focusing capability is improved, but mechanism complexity increases terribly
Solution Approach 1:
The objective lens is divided into three independent lens groups with distinct functions: the first lens group (positive power) for initial focusing, the second lens group (negative power) for fine focusing adjustments, and the third lens group (positive power) serving as both vibration reduction and image position adjustment. This segmentation allows each group to be optimized for its specific function, achieving focusing capability without requiring a complex single-mechanism solution.
Solution Approach 2:
The patent implements dynamic control where the third lens group can move in two directions: perpendicular to the optical axis for vibration reduction and along the optical axis for image position adjustment. This dynamic multi-directional movement capability allows the system to handle both focusing and stabilization requirements without increasing mechanism complexity.
3Length of moving object
If the optical system is made more compact for portability, then ease of carrying is improved, but optical performance may deteriorate
Solution Approach 1:
The patent optimizes the focal lengths and spacing of the three lens groups to satisfy specific conditional expressions, creating a balanced optical configuration. The third lens group's dual functionality as both vibration reduction and image position adjustment mechanism reduces the overall system length while maintaining adequate optical path lengths for high-quality imaging, thus achieving compactness without sacrificing optical performance.
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 provides optimal optical performance with a vibration reduction function, preventing image blur from external vibrations and ensuring convenient portability by maintaining a balanced lens length, while allowing for effective aberration corrections.
Implementation Method 1
an objective lens comprising, in order from an object side, a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having positive refractive power
Implementation Method 2
an erecting prism; and an eyepiece
Data Source
AI summary
A telescope optical system TL comprising, in order from an object side: an objective lens 1; an erecting prism 2; and an eyepiece 3; the objective lens 1 comprising, in order from the object side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power, focusing being carried out by moving the second lens group G2 along an optical axis, and an image position being movable by moving the third lens group G3 in a direction perpendicular to the optical axis, thereby providing a telescope optical system having optimum optical performance for a telescope.