All-Reflective Relayed Focal Telescope Design

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Solution Overview

Problem

Conventional optical systems require different telescopes for focal and afocal functions, limiting their versatility in imaging tasks.

Innovation Solution

An all-reflective optical system is designed using a primary mirror with a positive-powered concave paraboloidal configuration, a secondary mirror with a negative-powered convex hyperboloidal configuration, a tertiary mirror for reimaging, and a quaternary mirror for aberration correction, allowing both focal and afocal functions to be achieved with shared mirrors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If different telescopes are used for focal and afocal functions, then each function can be optimized, but the system complexity and number of devices increase

Engineering Contradiction:
Improveoptical function performanceVSAvoidnumber of telescopes
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies universality by designing a single all-reflective optical system that can perform both focal and afocal functions. The system uses a primary mirror, secondary mirror, and optional tertiary mirror configuration that can be adjusted to provide either focal imaging (with all mirrors engaged) or afocal relay (with the tertiary mirror removed or disengaged), eliminating the need for separate telescopes for each function.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent applies dynamics by making the optical system reconfigurable. The tertiary mirror can be positioned or removed to change the system's optical function between focal and afocal modes. This dynamic adjustment allows one physical system to adapt to different operational requirements, reducing the total number of devices needed.

Inventive Principle:
Principle #15Dynamics

2Reliability

If a focal three-mirror anastigmat telescope is used, then focal plane imaging is achieved, but the system cannot perform afocal relay functions

Engineering Contradiction:
Improvefocal imaging capabilityVSAvoidoptical function range
Core Design Contradiction:
ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent creates a universal optical system that incorporates both focal and afocal capabilities. By using an all-reflective three-mirror anastigmat configuration where the tertiary mirror can be optionally engaged, the system provides focal plane imaging when all mirrors are active and afocal relay capability when the tertiary mirror is removed or disengaged, thus achieving multi-functionality.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent applies segmentation by separating the optical functions into distinct operational modes. The focal function uses all three mirrors working together, while the afocal function uses only the primary and secondary mirrors. This segmentation of functional pathways allows the same physical components to serve different purposes through selective engagement.

Inventive Principle:
Principle #1Segmentation

3Reliability

If an afocal three-mirror anastigmat telescope is used, then afocal relay functions are achieved, but the system cannot perform focal plane imaging

Engineering Contradiction:
Improveafocal relay capabilityVSAvoidoptical function range
Core Design Contradiction:
ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent designs a universal system that can perform both afocal relay and focal plane imaging. The all-reflective configuration with adjustable tertiary mirror engagement allows the system to operate in afocal mode (for relay functions) or switch to focal mode (for plane imaging) by simply reconfiguring the tertiary mirror position, thus achieving versatility.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent applies dynamics by enabling the system to transition between afocal and focal operational states. The tertiary mirror's position can be dynamically adjusted to change the optical path, allowing the same physical system to adapt to different imaging tasks requiring either afocal relay or focal plane output.

Inventive Principle:
Principle #15Dynamics

4Reliability

If conventional focal and afocal telescopes are designed separately, then each is optimized for its specific function, but the overall system versatility decreases

Engineering Contradiction:
Improvefunction-specific optimizationVSAvoidmulti-function capability
Core Design Contradiction:
ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent resolves this contradiction by creating a universal optical platform that maintains function-specific optimization while achieving multi-function capability. The all-reflective three-mirror anastigmat design with optional tertiary mirror engagement provides optimized focal imaging when needed and optimized afocal relay when needed, all within a single reconfigurable system.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent applies merging by combining the focal and afocal telescope designs into a single all-reflective optical system. By using shared primary and secondary mirrors with an optionally engaged tertiary mirror, the patent merges two previously separate telescope designs into one unified system that can perform both functions with optimized performance for each.

Inventive Principle:
Principle #5Merging (Combining)

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 system provides a versatile optical solution capable of performing both focal and afocal functions, correcting aberrations and achieving high image quality across a wide field of view, while maintaining the advantages of afocal three-mirror anastigmat optical systems.

Implementation Method 1

a primary mirror of a positive-powered concave paraboloidal configuration configured to reflect light incident thereupon

Methodology Applied
Scientific EffectReflection: Reflection

Implementation Method 2

a secondary mirror of a negative-powered convex hyperboloidal configuration facing the primary mirror configured to receive the light reflected from the primary mirror and redirect the light reflected from the primary mirror

Methodology Applied
Scientific EffectReflection: Reflection

Implementation Method 3

a positive-powered tertiary mirror configured to substantially reimage and reflect divergent light rays incident from the secondary mirror

Methodology Applied
Scientific EffectReflection: Reflection

Implementation Method 4

a negative-powered quaternary mirror configured to receive the reimaged light rays from the tertiary mirror, and to relay the received reimaged light rays to a focal point

Methodology Applied
Scientific EffectReflection: Reflection

Data Source

PatentUS8427744B2All-reflective relayed focal telescope derived from the first two mirrors of an afocal three-mirror anastigmat
Publication Date: 2013.04.23 RAYTHEON CO
  • US8427744B2 patent drawing
  • US8427744B2 patent drawing
  • US8427744B2 patent drawing

AI summary

An optical system includes a primary mirror of a positive-powered concave substantially paraboloidal configuration configured to reflect light incident thereupon; a secondary mirror of a negative-powered convex hyperboloidal configuration facing the primary mirror configured to receive the light reflected from the primary mirror and redirect the light reflected from the primary mirror; a positive-powered tertiary mirror configured to substantially reimage and reflect divergent light rays incident from the secondary mirror; and a powered quaternary mirror configured to receive the reimaged light rays from the tertiary mirror, and to relay the received reimaged light rays to a focal point.