CN115598814A - Off-axis reflective long-focus large-view-field collimator and working method thereof - Google Patents
Off-axis reflective long-focus large-view-field collimator and working method thereof Download PDFInfo
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- CN115598814A CN115598814A CN202210460578.XA CN202210460578A CN115598814A CN 115598814 A CN115598814 A CN 115598814A CN 202210460578 A CN202210460578 A CN 202210460578A CN 115598814 A CN115598814 A CN 115598814A
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- 238000013461 design Methods 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 description 3
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/02—Catoptric systems, e.g. image erecting and reversing system
- G02B17/06—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror
- G02B17/0626—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror using three curved mirrors
- G02B17/0642—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror using three curved mirrors off-axis or unobscured systems in which not all of the mirrors share a common axis of rotational symmetry, e.g. at least one of the mirrors is warped, tilted or decentered with respect to the other elements
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Abstract
The invention relates to an off-axis reflection type long-focus large-view-field collimator, wherein an optical system of the off-axis reflection type long-focus large-view-field collimator comprises a target surface D, a third mirror C, a secondary mirror B and a main mirror A which are sequentially arranged along an optical incidence direction, light beams are sequentially reflected by the target surface D, the third mirror C, the secondary mirror B and the main mirror A and then emitted as parallel light, the reflection surface of the main mirror A is an off-axis concave hyperboloid, the reflection surface of the secondary mirror B is an off-axis convex spherical surface, and the reflection surface of the third mirror C is an off-axis concave spherical surface. The invention adopts an off-axis three-mirror structure, realizes the focal length of 2000 mm, the relative aperture of 1/10, the angle of view of 2 degrees and 2 degrees, and the distortion of less than 0.3 percent, only adopts one concave secondary hyperboloid mirror in the design, and adopts two off-axis spherical mirrors in addition, thereby reducing the processing difficulty and the cost.
Description
Technical Field
The invention relates to an off-axis reflective long-focus large-view-field collimator and a working method thereof.
Background
The structural types of the parallel light pipe comprise a refraction type, a reflection type and a refraction and reflection type, wherein the refraction type and the refraction and reflection type parallel light pipe have larger view fields, but because the refractive index of the optical glass has a nonlinear relation with the wavelength, the secondary spectrum and chromatic aberration of an optical system are difficult to correct along with the increase of the focal length and the broadening of the spectrum of the parallel light pipe; the reflective optical system does not pass through the interior of the material, so that the problem of chromatic dispersion does not exist, the reflective optical system can be applied to the detection requirement of a wide spectrum, and the defect is that the field of view is not large enough; the reflection type system can be divided into a coaxial reflection type and an off-axis reflection type, the coaxial reflection type is not suitable for detection equipment due to the fact that a barrier exists in the center, and therefore the off-axis reflection type parallel light tube with the large view field and the high resolution has many advantages in the field of debugging detection.
At present, the off-axis reflective collimator mainly comprises three off-axis aspheric mirrors, and compared with a coaxial system, the off-axis reflective system is more difficult to process, assemble and correct and high in cost, so that how to reduce the processing difficulty and the cost becomes a problem to be solved urgently.
Disclosure of Invention
The invention improves the problems, namely the technical problem to be solved by the invention is to provide an off-axis reflective long-focus large-field collimator tube, which is applicable to the spectral range of 400-1000 nm, and only one concave double-curved-surface mirror and two off-axis spherical mirrors are adopted in the design, so that the processing difficulty and the cost are reduced.
The invention is formed in this way, it includes target surface D, three mirrors C, secondary mirror B and primary mirror A set up sequentially along the optical incident direction, the light beam emerges as the parallel light after the reflection of target surface D, three mirrors C, secondary mirror B, primary mirror A sequentially, the reflecting surface of the said primary mirror A is the concave hyperboloid of off-axis, the reflecting surface of the secondary mirror B is the convex sphere of off-axis, the reflecting surface of the three mirrors C is the concave sphere of off-axis.
Further, Y1 of the center distance between the primary mirror a and the three mirrors C satisfies: 350 Y1 is more than or equal to mm and less than or equal to 375 mm, and the central distance Y2 between the secondary mirror B and the three-mirror C satisfies the following conditions: 350 Y2 is more than or equal to mm and less than or equal to 375 mm.
Further, the distance Z1 between the primary mirror a and the three mirrors C satisfies: 85 Z1 is more than or equal to mm and less than or equal to 95 mm, and the interval Z2 between the secondary mirror B and the tertiary mirror C meets the following requirements: 950 Z2 is more than or equal to mm and less than or equal to 1000 mm.
Further, the curvature radius of the vertex of the reflecting surface of the main mirror A is more than or equal to 3500 mm and less than or equal to abs (R1) and less than or equal to 4500 mm, the hyperboloid eccentricity is more than or equal to 1.5 and less than or equal to e 1 and less than or equal to 2.1, and the theoretical rotation angle of the main mirror A is more than or equal to 0.5 degrees and less than or equal to theta 1 and less than or equal to 1.5 degrees.
Furthermore, the curvature radius of the reflecting surface of the secondary mirror B is more than or equal to 1500 mm and less than or equal to abs (R1) and less than or equal to 2000 mm, and the curvature radius of the off-axis concave spherical surface three-mirror C is more than or equal to 1500 mm and less than or equal to abs (R1) and less than or equal to 2200 mm.
Further, the size of the optical system does not exceed 625mm 1200mm.
Further, a diaphragm is arranged on the reflecting surface of the secondary mirror B.
Further, a working method of the off-axis reflection type long-focus large-view-field collimator is characterized in that light beams emitted by a light source are incident to a three-mirror C through a target surface D, after the light beams are reflected by the three-mirror C, the optical axis deflects by a certain angle and is incident to a secondary mirror B, and similarly, after the light beams are continuously reflected by the secondary mirror B and the primary mirror A in an off-axis mode, the light beams are finally emitted as parallel light.
Compared with the prior art, the invention has the following beneficial effects: (1) Only one quadric surface is adopted, and two off-axis spherical mirrors are adopted, so that the processing difficulty and cost are reduced; (2) the applicable spectral range is wide, 400-1000 nm; (3) the distortion is low and is less than 0.3%; and (4) the system size is small, and is less than 625mm x 1200mm.
Drawings
FIG. 1 is a schematic diagram of an optical system according to an embodiment of the present invention;
FIG. 2 is a graph of the modulation transfer function of an optical system according to an embodiment of the present invention;
FIG. 3 is a dot-column diagram of an optical system in accordance with an embodiment of the present invention;
FIG. 4 is a RAY FAN diagram of an optical system according to an embodiment of the present invention;
FIG. 5 is a distortion curve of an optical system according to an embodiment of the present invention;
FIG. 6 is a graph of relative illuminance of an optical system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example 1: referring to fig. 1 to 6, in this embodiment, an optical system of the off-axis reflective long-focus large-view-field collimator includes a target surface D, a third mirror C, a second mirror B, and a main mirror a, which are sequentially arranged along an optical incidence direction, and a light beam is reflected by the target surface D, the third mirror C, the second mirror B, and the main mirror a in sequence and then emitted as parallel light, a reflection surface of the main mirror a is an off-axis concave hyperboloid, a reflection surface of the second mirror B is an off-axis convex spherical surface, and a reflection surface of the third mirror C is an off-axis concave spherical surface.
In this embodiment, Y1, which is the center distance between the primary mirror a and the three mirrors C, satisfies: 350 Y1 is more than or equal to mm and less than or equal to 375 mm, and the central distance Y2 between the secondary mirror B and the three-mirror C satisfies the following conditions: 350 Y2 is more than or equal to mm and less than or equal to 375 mm.
In this embodiment, the distance Z1 between the primary mirror a and the three mirrors C satisfies: 85 Z1 is more than or equal to mm and less than or equal to 95 mm, and the interval Z2 between the secondary mirror B and the tertiary mirror C meets the following requirements: 950 Z2 is more than or equal to mm and less than or equal to 1000 mm.
In this embodiment, the off-axis amount of the primary mirror a is 187 mm, the off-axis amount of the secondary mirror B is 10 mm, and the off-axis amount of the tertiary mirror C is 180 mm.
In the embodiment, the curvature radius of the vertex of the off-axis concave hyperboloid of the primary mirror a is 3500 mm or more and abs (R1) or more and 4500 mm, the hyperboloid eccentricity is 1.5 or more and e or less and 2.1 or less, and the theoretical rotation angle of the primary mirror a is 0.5 or more and θ 1 or more and 1.5 or less.
In this embodiment, the radius of curvature of the off-axis convex spherical surface of the secondary mirror B satisfies 1500 mm ≤ abs (R1) ≤ 2000 mm, and the radius of curvature of the off-axis concave spherical surface three-mirror C satisfies 1500 mm ≤ abs (R1) ≤ 2200 mm.
In this embodiment, the size of the optical system does not exceed 625mm 1200mm, and the diaphragm is placed on the reflecting surface of the secondary mirror B.
In this embodiment, in operation: the light beam emitted by the light source is incident to the three-mirror C through the target surface D, after the light beam is reflected by the three-mirror C, the optical axis deflects for a certain angle and is incident to the secondary mirror B, and in the same way, the light beam is finally emitted as parallel light after the light beam is continuously reflected by the off-axis of the secondary mirror B and the main mirror A in sequence.
Example 2: in this embodiment, the off-axis reflective long-focus large-field collimator has a maximum target surface matching of 71 mm, a field angle greater than 2 ° by 2 °, a distortion less than 0.3%, and an entrance pupil diameter of 200mm.
Specific parameters of each lens in the optical system of the present embodiment are shown in table 1 below:
TABLE 1
Referring to fig. 2, the transfer function value of the light pipe optical system at a characteristic frequency of 50 lp/mm is more than 0.4.
Referring to fig. 3, the distortion of the light pipe optical system is low, less than 0.3%.
Referring to fig. 6, the relative illuminance of the off-axis reflective light pipe optical system is close to 100%, and no vignetting coefficient exists, so that the expected design requirement is met.
Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effects which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.
Meanwhile, if the invention as described above discloses or relates to parts or structural members fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using a bolt or screw connection) can also be understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
If the terms "first," "second," etc. are used herein to define parts, those skilled in the art will recognize that: the use of "first" and "second" is merely for convenience of description to distinguish between elements and components, and the terms do not have a special meaning unless otherwise stated.
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
Finally, it should be noted that the above examples are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (8)
1. The utility model provides a big visual field collimator of off-axis reflective long focus, its characterized in that, the optical system of the big visual field collimator of off-axis reflective long focus includes target surface D, three mirrors C, secondary mirror B and the primary mirror A that sets gradually along optical incidence direction, and the light beam is emergent with the parallel light after target surface D, three mirrors C, secondary mirror B, the reflection of primary mirror A in proper order, the plane of reflection of primary mirror A is off-axis concave hyperboloid, and the plane of reflection of secondary mirror B is off-axis convex sphere, and the plane of reflection of three mirrors C is off-axis concave sphere.
2. An off-axis reflective tele large-field collimator as claimed in claim 1, wherein Y1 of the distance between the centers of the primary mirror A and the three mirrors C satisfies the following condition: 350 Y1 is more than or equal to mm and less than or equal to 375 mm, and the central distance Y2 between the secondary mirror B and the three-mirror C satisfies the following conditions: 350 Y2 is more than or equal to mm and less than or equal to 375 mm.
3. An off-axis reflective tele large-field collimator as claimed in claim 1, wherein a distance Z1 between said primary mirror a and said third mirror C is such that: 85 The mm is more than or equal to Z1 and less than or equal to 95 mm, and the interval Z2 between the secondary mirror B and the three mirrors C meets the following conditions: 950 Z2 is more than or equal to mm and less than or equal to 1000 mm.
4. An off-axis reflective tele large-field collimator as claimed in claim 1, wherein the curvature radius of the vertex of the reflecting surface of the primary mirror A is 3500 mm ≦ abs (R1) ≦ 4500 mm, the hyperboloid eccentricity 1.5 ≦ e ≦ 2.1, and the theoretical rotation angle of the primary mirror A is 0.5 ° ≦ θ 1 ≦ 1.5 °.
5. An off-axis reflective tele large-field collimator as claimed in claim 1, wherein the radius of curvature of the reflective surface of the secondary mirror B is 1500 mm abs (R1) 2000 mm, and the radius of curvature of the off-axis concave spherical surface three-mirror C is 1500 mm abs (R1) 2200 mm.
6. An off-axis reflective tele large-field collimator as claimed in claim 1 in which the dimensions of the optical system are no more than 625mm 1200mm.
7. An off-axis reflective tele large-field collimator as claimed in claim 1, wherein the secondary mirror B has a stop on its reflective surface.
8. An operating method of the off-axis reflective long-focus large-view-field collimator as claimed in any one of claims 1 to 7, wherein a light beam emitted by the light source enters the three-mirror C through the target surface D, and after being reflected by the three-mirror C, an optical axis is deflected by a certain angle and enters the secondary mirror B, and similarly, after the light beam continues to be sequentially reflected by the off-axis of the secondary mirror B and the primary mirror A, the light beam finally exits as parallel light.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210460578.XA CN115598814A (en) | 2022-04-28 | 2022-04-28 | Off-axis reflective long-focus large-view-field collimator and working method thereof |
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| CN202210460578.XA CN115598814A (en) | 2022-04-28 | 2022-04-28 | Off-axis reflective long-focus large-view-field collimator and working method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5640283A (en) * | 1995-10-20 | 1997-06-17 | The Aerospace Corporation | Wide field, long focal length, four mirror telescope |
| RU2006126849A (en) * | 2006-07-24 | 2008-01-27 | ФГУП "Государственный оптический институт им. С.И. Вавилова" (RU) | THREE-MIRROR OPTICAL SYSTEM WITHOUT SCREENING |
| CN105467569A (en) * | 2016-01-08 | 2016-04-06 | 苏州大学 | Off-axis three-mirror prepositive optic system |
| US20160223394A1 (en) * | 2015-02-03 | 2016-08-04 | Raytheon Company | Advanced optics for irst sensor |
| CN111596450A (en) * | 2020-05-29 | 2020-08-28 | 中国科学院西安光学精密机械研究所 | Large-view-field long-focus off-axis three-reflection type collimator optical system |
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- 2022-04-28 CN CN202210460578.XA patent/CN115598814A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5640283A (en) * | 1995-10-20 | 1997-06-17 | The Aerospace Corporation | Wide field, long focal length, four mirror telescope |
| RU2006126849A (en) * | 2006-07-24 | 2008-01-27 | ФГУП "Государственный оптический институт им. С.И. Вавилова" (RU) | THREE-MIRROR OPTICAL SYSTEM WITHOUT SCREENING |
| US20160223394A1 (en) * | 2015-02-03 | 2016-08-04 | Raytheon Company | Advanced optics for irst sensor |
| CN105467569A (en) * | 2016-01-08 | 2016-04-06 | 苏州大学 | Off-axis three-mirror prepositive optic system |
| CN111596450A (en) * | 2020-05-29 | 2020-08-28 | 中国科学院西安光学精密机械研究所 | Large-view-field long-focus off-axis three-reflection type collimator optical system |
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