CN110989143A - Virtual object lighting lens with object space telecentric - Google Patents
Virtual object lighting lens with object space telecentric Download PDFInfo
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- CN110989143A CN110989143A CN202010005435.0A CN202010005435A CN110989143A CN 110989143 A CN110989143 A CN 110989143A CN 202010005435 A CN202010005435 A CN 202010005435A CN 110989143 A CN110989143 A CN 110989143A
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- lens
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- virtual object
- negative lens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/22—Telecentric objectives or lens systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
- G02B27/0961—Lens arrays
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- Optics & Photonics (AREA)
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Abstract
The invention relates to an object space telecentric virtual object lighting lens, which comprises a projection lens, wherein the projection lens comprises a plurality of coaxially arranged lens components arranged between a projection surface and a light incident surface, and the lens components are a first negative lens, a second negative lens, a third cemented lens and a fifth positive lens in sequence from the projection surface to the light incident surface; the light incident surface is superposed with the outward end surface of the fifth positive lens. The invention adopts the design of the virtual object surface, the virtual object surface of the light spot is between the projection surface and the light incident surface of the lens, and the distance from the light spot to the light emergent surface of the lens is greatly reduced; the object space telecentric design is adopted, and the object space telecentric design can be matched with a telecentric dodging light path for use, particularly the telecentric light path which uses the compound eye principle to achieve the dodging effect. When the telecentric optical path focus plane is superposed with the object plane, the convergent light can be diverged and projected uniformly.
Description
Technical Field
The invention belongs to the illumination projection technology in the illumination field, and particularly relates to a virtual object illumination lens with a telecentric object space and uniform projection brightness.
Background
At present, the conventional reverse-far type projection objective is used for uniform projection of conventional illumination, light spots, a lens and a projection surface are sequentially arranged, and the uniform high-brightness light spots are amplified and projected through the reverse-far type projection objective. Although the anti-telephoto type projection lens can achieve a good projection effect, the distance from the light spot to the light-emitting surface of the objective lens is large, and the volume of the whole illumination projection device is increased.
Disclosure of Invention
In order to overcome the defects of the prior art, the virtual object illumination lens with telecentric object space is provided, the virtual object surface design is adopted, the virtual object surface of the light spot is arranged between the projection surface and the light incident surface of the lens, and the distance from the light spot to the light emergent surface of the lens is greatly reduced; by adopting the object space telecentric design, the optical path can be matched with a telecentric dodging optical path for use, particularly the telecentric optical path which uses the compound eye principle to achieve the dodging effect, and when the focal plane of the telecentric optical path is superposed with the object plane, the convergent light can be dispersed and the projection is uniform.
The structure adopted by the invention is as follows: an object space telecentric virtual object lighting lens comprises a projection lens, wherein the projection lens comprises a plurality of coaxially arranged lens components arranged between a projection surface and a light incident surface, and the lens components are a first negative lens, a second negative lens, a third cemented lens and a fifth positive lens in a coaxial arrangement sequence from the projection surface to the light incident surface; the light incident surface is superposed with the outward end surface of the fifth positive lens.
Preferably, the lens object plane is a virtual object plane and is located between the projection plane and the light incident plane.
Further, the focal length of the first negative lens is between-60 mm and-40 mm; the focal length of the second negative lens is between-70 mm and-40 mm; the focal length of the third negative lens is between-70 mm and-40 mm; the focal length of the tri-cemented lens is between-30 mm and-15 mm; the focal length of the fifth positive lens is between 50mm and 80 mm.
Further, the refractive index of the first negative lens is between 1.70 and 2.1; the refractive index of the second negative lens is between 1.70 and 2.1; the refractive index of the third negative lens is between 1.70 and 2.1; in the triple cemented lens, the refractive index of the negative lens close to the third negative lens is between 1.70 and 2.1, the refractive index of the middle positive lens is between 1.65 and 1.80, and the refractive index of the negative lens close to the fifth positive lens is between 1.70 and 2.1; the refractive index of the fifth positive lens is between 1.65 and 1.80.
Further, the distance from the vertex of the convex surface of the first negative lens to the virtual object surface is less than 15 mm.
The invention has the beneficial effects that:
1. the invention is realized by adopting the imaging principle of a negative focal length lens to enlarge virtual objects into real images. Selecting a reasonable negative focal length lens group structure as an initial structure according to the structure, adjusting the telecentricity, changing the size of an object plane, and finally achieving the virtual object illumination lens design of object space telecentricity through the optimized design of changing and increasing and decreasing glass materials, focal length zooming and speckle control;
2. the invention provides a virtual object lighting lens with a field angle of 80 degrees, relative illumination greater than 73%, a distance between the vertex of the convex surface of the first negative lens and a virtual object surface of 10mm, a diameter of an object surface circle of 14.7mm and an F number of 2.0, and the virtual object lighting lens is simple in structure and cost-controlled and optimized;
3. the invention is based on the optical imaging principle, and uses optical design software to repeatedly modify the structure of the lens to achieve the optimized design of the dispersed spot;
4. the invention adopts the virtual object surface design, the virtual object surface of the light spot is arranged between the projection surface and the light incident surface of the lens, and the distance from the light spot to the light emergent surface of the lens is greatly reduced. When the telecentric optical path focus plane is superposed with the object plane, the convergent light can be diverged and projected uniformly.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a graph of relative illuminance for the present invention;
fig. 3 is a dot diagram of the present invention.
In the figure: 1. a projection surface; 2. a light incident surface; 3. a first negative lens; 4. a second negative lens; 5. a third negative lens; 6. a tri-cemented lens; 7. a fifth positive lens; 8. and (5) a lens object plane.
Detailed Description
The embodiments of the present invention will be further explained with reference to the drawings.
The invention discloses an object space telecentric virtual object lighting lens in fig. 1, which comprises a projection lens, wherein the projection lens comprises a plurality of coaxially arranged lens components arranged between a projection surface 1 and a light incident surface 2, and the plurality of coaxially arranged lens components from the projection surface to the light incident surface are a first negative lens 3, a second negative lens 4, a third negative lens 5, a third cemented lens 6 and a fifth positive lens 7; the light incident surface is superposed with the outward end surface of the fifth positive lens.
A lens object plane 8 is arranged between the projection plane and the light incident plane, and the lens object plane is a virtual object plane.
The focal length of the first negative lens is between-60 mm and-40 mm; the focal length of the second negative lens is between-70 mm and-40 mm; the focal length of the third negative lens is between-70 mm and-40 mm; the focal length of the tri-cemented lens is between-30 mm and-15 mm; the focal length of the fifth positive lens is between 50mm and 80 mm.
And the refractive index of the first negative lens is between 1.70 and 2.1; the refractive index of the second negative lens is between 1.70 and 2.1; the refractive index of the third negative lens is between 1.70 and 2.1; in the triple cemented lens, the refractive index of the negative lens close to the third negative lens is between 1.70 and 2.1, the refractive index of the middle positive lens is between 1.65 and 1.80, and the refractive index of the negative lens close to the fifth positive lens is between 1.70 and 2.1; the refractive index of the fifth positive lens is between 1.65 and 1.80.
The distance from the vertex of the convex surface of the first negative lens to the virtual object surface is less than 15 mm.
The curvature radius, material and thickness of each lens and the distance between the lenses are modified to achieve the optimization of the dispersed spots.
The following are parameters of an embodiment of the optical system for virtual object illumination according to the present invention.
| Surface | Type | | Thickness | Glass | |
| 1 | Light emitting surface | 23.708 | 1.500 | 1.91,35.3 | |
| 2 | 15.142 | 4.535 | |||
| 3 | 42.464 | 1.500 | 1.91,35.3 | ||
| 4 | 22.960 | 6.825 | |||
| 5 | 235.117 | 1.856 | 1.91,35.3 | ||
| 6 | 40.887 | 2.439 | |||
| 7 | -43.677 | 1.625 | 1.91,35.3 | ||
| 8 | 12.569 | 10.308 | 1.78,25.7 | ||
| 9 | -20.062 | 1.000 | 1.91,35.3 | ||
| 10 | 379.751 | 0.200 | |||
| 11 | 36.791 | 3.645 | 1.78,25.7 | ||
| 12 | Light incident surface | 116.426 | 0.000 | ||
| 13 | infinity | -25.266 | |||
| 14 | Virtual noodle | infinity | 0 |
And finally obtaining the virtual object lighting lens with the field angle of 80 degrees, the relative illumination intensity of more than 73 percent, the distance between the vertex of the convex surface of the first negative lens and the virtual object surface of 10mm, the diameter of the object surface circle of 14.7mm and the F number of 2.0.
Fig. 2 is a graph of relative illuminance of the present invention. The contrast in the figure is greater than 73%.
FIG. 3 is a dot diagram of the present invention, which shows that the average diffuse spot radius of the dot diagram under each field of view is less than 84.285 μm, and the present invention has good reverse light condensation.
Claims (5)
1. An object space telecentric virtual object illumination lens comprises a projection lens and is characterized in that the projection lens comprises a plurality of coaxially arranged lens components arranged between a projection surface and a light incident surface, and the lens components are a first negative lens, a second negative lens, a third cemented lens and a fifth positive lens in a coaxial arrangement sequence from the projection surface to the light incident surface; wherein
The light incident surface is superposed with the outward end surface of the fifth positive lens.
2. An object space telecentric virtual object illumination lens according to claim 1, wherein: a lens object plane is arranged between the projection plane and the light incident plane and is a virtual object plane.
3. An object space telecentric virtual object illumination lens according to claim 1, wherein:
the focal length of the first negative lens is between-60 mm and-40 mm;
the focal length of the second negative lens is between-70 mm and-40 mm;
the focal length of the third negative lens is between-70 mm and-40 mm;
the focal length of the tri-cemented lens is between-30 mm and-15 mm;
the focal length of the fifth positive lens is between 50mm and 80 mm.
4. An object space telecentric virtual object illumination lens according to claim 1, wherein:
the refractive index of the first negative lens is between 1.70 and 2.1;
the refractive index of the second negative lens is between 1.70 and 2.1;
the refractive index of the third negative lens is between 1.70 and 2.1;
in the triple cemented lens, the refractive index of the negative lens close to the third negative lens is between 1.70 and 2.1, the refractive index of the middle positive lens is between 1.65 and 1.80, and the refractive index of the negative lens close to the fifth positive lens is between 1.70 and 2.1;
the refractive index of the fifth positive lens is between 1.65 and 1.80.
5. An object space telecentric virtual object illumination lens according to claim 1, wherein: the distance between the vertex of the convex surface of the first negative lens and the virtual object surface is less than 15 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010005435.0A CN110989143A (en) | 2020-01-03 | 2020-01-03 | Virtual object lighting lens with object space telecentric |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010005435.0A CN110989143A (en) | 2020-01-03 | 2020-01-03 | Virtual object lighting lens with object space telecentric |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110989143A true CN110989143A (en) | 2020-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010005435.0A Pending CN110989143A (en) | 2020-01-03 | 2020-01-03 | Virtual object lighting lens with object space telecentric |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110989143A (en) |
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2020
- 2020-01-03 CN CN202010005435.0A patent/CN110989143A/en active Pending
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