Observation Optical System Vibration Correction Lens
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Solution Overview
Problem
Existing observation optical systems for telescopes and binoculars lack sufficient performance in both vibration proof function and focusing function, failing to effectively correct image blur caused by vibrations such as hand shaking.
Innovation Solution
The observation optical system comprises an objective optical system, an erecting optical system, and an eyepiece optical system, with a configuration of first, second, and third lens groups that allow for both image blur correction through decentering of the third lens group and appropriate focusing movement of the second lens group, while minimizing eccentric aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vibration proof mechanism is added to correct image blur, then the vibration proof function is improved, but the device complexity increases and the focusing function deteriorates
Solution Approach 1:
The third lens group serves dual functions: it acts as both the vibration proof lens group for correcting image blur caused by hand shaking and the focusing lens group for adjusting focus. By making the third lens group movable in both directions (perpendicular to optical axis for vibration correction and along optical axis for focusing), the system achieves multi-functionality without adding separate mechanisms, thereby improving reliability while controlling device complexity.
2Reliability
If the third lens group is used for vibration proof correction, then the vibration proof correction angle is improved, but the focusing movement range is reduced
Solution Approach 1:
The patent utilizes two different movement dimensions for the third lens group: movement perpendicular to the optical axis for vibration proof correction and movement along the optical axis for focusing. By separating these functions into different dimensional directions, the system achieves sufficient vibration proof correction angle while maintaining appropriate focusing movement range, as each dimension operates independently without interfering with the other.
3Reliability
If lens groups are decentered to correct image blur, then the vibration proof function is improved, but eccentric aberrations increase
Solution Approach 1:
The patent carefully controls the decentering amount of the third lens group to be within a specific range (0.005mm to 0.05mm) to achieve effective image blur correction while minimizing the generation of eccentric aberrations. By optimizing this parameter and setting appropriate conditional expressions for the optical system configuration, the system achieves sufficient vibration proof function while keeping eccentric aberrations at acceptable levels.
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 achieves a sufficient vibration proof correction angle and appropriate focusing movement, enhancing the optical system's ability to correct image blur and maintain image quality, while reducing aberrations and ensuring precise focusing.
Implementation Method 1
a vibration proof lens group (third lens group G3) which moves in a direction that is perpendicular to the optical axis, that is, decenteres with respect to the optical axis, to correct image blur
Implementation Method 2
an objective optical system OB which includes a first lens group G1 that has positive refractive power, a second lens group G2 that has positive or negative refractive power, and a third lens group G3 that has negative refractive power
Data Source
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AI summary
An objective optical system (OB) which forms an observation optical system (LS) consists of, in order from the object, a first lens group (G1) that has positive refractive power, a second lens group (G2) that has positive or negative refractive power, and a third lens group (G3) that has negative refractive power. Focusing is performed by moving the second lens group (G2) along an optical axis, the third lens group (G3) is configured to move in a direction that is perpendicular to the optical axis to correct image blur, and the following conditional expression is satisfied: 0.70≤f1/f12≤1.50 where f1 denotes a focal length of the first lens group (G1), and f12 denotes a combined focal length of the first lens group (G1) and the second lens group (G2).