CN101581828A - Annular aperture ultrathin optical imaging system - Google Patents
Annular aperture ultrathin optical imaging system Download PDFInfo
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- CN101581828A CN101581828A CNA2009100322413A CN200910032241A CN101581828A CN 101581828 A CN101581828 A CN 101581828A CN A2009100322413 A CNA2009100322413 A CN A2009100322413A CN 200910032241 A CN200910032241 A CN 200910032241A CN 101581828 A CN101581828 A CN 101581828A
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Abstract
The invention discloses an annular aperture ultrathin optical imaging system which can be used for a portable small-scale camera, a mobile phone lens or other civil optical imaging systems. The annular aperture ultrathin optical imaging system comprises a flat lens and a compensator; and the clear aperture is annular. The front surface of the flat lens is a plane reflector, while the rear surface has four coaxial annular high-order aspheric reflectors on the same substrate; and air is adopted as a light transmission medium. The system can obviously reduce the size and the weight while keeping good imaging quality and provide an effective method for improving a conventional refraction system. Compared with a common small-scale lens, the lens has the characteristics of good imaging quality, large numerical aperture, simple assembly and adjustment, low cost, portability, easy processing, suitability for large-batch production and the like.
Description
Technical field
The present invention relates to a kind of miniature ultrathin optical imaging system, particularly a kind of annular aperture light path is the reflection-type ultrathin optical imaging system repeatedly, can be used as the camera lens of micro-camera.
Background technology
Along with the continuous development of the thin camera lens of ultralight, the microminiaturization of optical imaging systems such as camera becomes possibility, and various micro-lens become the focus that people pay close attention to, and the thin camera lens of ultralight will become an important branch of future market.Though micro-lens is very general, its resolution and luminous energy collection rate are lower.The thickness of camera mainly is limited by this key factor of lens construction, and in order to keep relative good picture element when reducing camera volume and thickness, emphasis need improve lens design.How to make camera lens thinner, become the top priority that reduces the camera volume more for a short time.
Have optical imaging system,, must rationally use aspheric surface to proofread and correct, senior aberration elementary effectively, design is met the demands with balance along with the increase of visual field and bore than object lens of large relative aperture.The use of optical aspherical surface is subjected to the restriction of manufacturing cost usually, and at visible light wave range, its cost is the hundreds of times of sphere element, even thousands of times.Aspheric optical system designs, processes, checks, debugs and have large improvement at present, and the picture element of optical system is feasible near diffraction limit so use aspheric surface in the system.Using the problem that aspheric surface run in optical system mainly is technological problems---manufacturing feasibility in batch, and processing and detection method etc.Can solve general aspherical mirror machining problem with plastic sheeting die mould processing method, adopt aspheric surface can make the obvious attenuation of optical system thickness, make object lens of large relative aperture become possibility.
Before the present invention makes, document " Ultrathin cameras using annular folded optics " (Applied Optics, 2007,46 (4): disclose repeatedly reflection-type ultrathin optical imaging system of a kind of annular aperture light path 463-471), the gross thickness of this system is 5mm, and effective aperture is 27mm, and focal length is 38mm, compare with the conventional lenses of identical bore, keeping thickness, the volume and weight that has significantly reduced camera when better luminous energy is collected.But the light ray propagation medium of this system is CaF
2, cost is higher, is not easy to large-scale promotion and uses.
Summary of the invention
The objective of the invention is deficiency, provide a kind of picture element good, low cost of manufacture, and the annular aperture ultrathin optical imaging system that is suitable for producing in batches at the prior art existence.
For achieving the above object, the technical solution adopted in the present invention is: a kind of annular aperture ultrathin optical imaging system, comprise dull and stereotyped camera lens and compensator, and its clear aperature is an annular; Described dull and stereotyped camera lens, front surface are plane mirror, and the rear surface is reflected light successively for being in same suprabasil four coaxial annular high order aspheric surface catoptrons; Between the forward and backward surface of dull and stereotyped camera lens, adopt the medium of air as light ray propagation; Described compensator is positioned at the center at dull and stereotyped camera lens rear surface place, and it is made up of three lens, and close dull and stereotyped camera lens rear surface is followed successively by first lens of positive light coke, second lens of negative power and the 3rd lens of positive light coke; The diaphragm of system is positioned at the annular high order aspheric surface catoptron place of for the first time light being reflected.
The service band of optical imaging system is 486～656nm, and focal length is 38mm, and the object space numerical aperture is 0.7, and the ratio of obstruction is 0.79.
The gross thickness of optical imaging system is 10～15mm; The thickness of described dull and stereotyped camera lens is 3～5mm, and overall diameter is 60mm.
It is 1.5～1.6 glass material that first of described compensator and the 3rd lens adopt refractive index, and it is 1.7～1.8 glass material that second lens adopt refractive index.
Compared with prior art, advantage of the present invention is: annular aperture ultrathin optical imaging system adopts repeatedly reflection ray folding, therefore, has that volume is little, the characteristics of compact conformation; Adopt the medium of air, can reduce manufacturing cost greatly as light ray propagation; Four coaxial annular high order aspheric surface catoptrons are positioned in the same optical plastic substrate, and available diamond cutting processing mold is processed with the method for injection mo(u)lding then, thereby realizes producing in enormous quantities; Adopt no focal power compensator to enlarge the visual field, make under big visual field, still can obtain picture element preferably.
Description of drawings
Fig. 1 is the structural representation of the annular aperture ultrathin optical imaging system (light path) that provides of the embodiment of the invention;
Fig. 2 is the annular aperture ultrathin optical imaging system ray tracing point range figure that the embodiment of the invention provides;
Fig. 3 is the annular aperture ultrathin optical imaging system transfer curve figure that the embodiment of the invention provides;
Fig. 4 is the annular aperture ultrathin optical imaging system curvature of field and the distortion curve figure that the embodiment of the invention provides;
Fig. 5 is the annular aperture ultrathin optical imaging system lateral chromatic aberration curve map that the embodiment of the invention provides;
Wherein, 1 (1 '), clear aperture; 2 (2 '), 4 (4 '), 6 (6 ') and 8 (8 ') are followed successively by and are positioned at same suprabasil four annular high order aspheric surface catoptrons (annular aperture); 3 (3 '), 5 (5 '), 7 (7 ') and 9 (9 ') are four plane mirrors that overlap fully; 10, first catoptron in the compensator; 11, second catoptron in the compensator; 12, the 3rd catoptron in the compensator.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is further described.
Embodiment 1:
Referring to accompanying drawing 1, it is that Fig. 1 is the structural representation of the annular aperture ultrathin optical imaging system (light path) that provides of the embodiment of the invention.Referring to accompanying drawing 1, the optical imaging system that present embodiment provided comprises dull and stereotyped camera lens and compensator, and light enters system through annular clear aperature 1 (1 ').The front surface of dull and stereotyped camera lens is plane mirror 3 (3 '), 5 (5 '), 7 (7 ') and 9 (9 '), and they are four plane mirrors that coincide together; The rear surface is followed successively by 2 (2 '), 4 (4 '), 6 (6 ') and 8 (8 ') for being in same suprabasil four coaxial annular high order aspheric surface catoptrons; Between the forward and backward surface of dull and stereotyped camera lens, adopt the medium of air as light ray propagation.Compensator is positioned at the center at dull and stereotyped camera lens rear surface place, and it is made up of three lens, and close dull and stereotyped camera lens rear surface is followed successively by first lens 10 of positive light coke, second lens 11 of negative power and the 3rd lens 13 of positive light coke.
By designing requirement, the service band of system is 486～656nm, and focal length is 38mm, and the object space numerical aperture is 0.7, and the ratio of obstruction is 0.79.
In the present embodiment, annular aspheric reflecting surface 2 (2 ') adopts 10 aspheric surfaces of hyperboloid type, and it is 12 aspheric surfaces of 0 that 4 (4 '), 6 (6 ') and 8 (8 ') are all adopted the quadric surface coefficient, and wherein, aspheric surface obtains by following formula:
In the formula, c is the basic curvature at place, summit; K is the conic section constant; R is the axial radial coordinate of vertical light; A, B, C, D and E are asphericity coefficient.In the present embodiment, the concrete parameter of optical system that obtains of optimal design such as table 1 and table 2 are listed.
Table 1: the optical system parameter that optimal design obtains
| Radius-of-curvature r (mm) | Spacing T (mm) | Optical material | The quadric surface coefficient k | |
| Object plane | Infinity | 2500 | ||
| 1 (1 ') clear aperture | Infinity | 9.5 | ||
| 2 (2 ') diaphragm | -55.9075 | -9.5 | mirror | -2.840031 |
| 3(3’) | |
3 | ||
| 4(4’) | 72.3434 | -3 | mirror | 0 |
| 5(5’) | Infinity | 3.5 | ||
| 6(6’) | -3870.8515 | -3.5 | mirror | 0 |
| 7(7’) | Infinity | 3.5 | ||
| 8(8’) | -272.2122 | -3.5 | mirror | 0 |
| 9(9’) | Infinity | 4 | ||
| |
13.0007 | 2.7359 | K9_CHINA | |
| |
35.7769 | 2.4232 | ||
| |
18.8142 | 1 | ZF6_CHINA | |
| |
6.2926 | 0.1 | ||
| |
6.8082 | 1.9749 | K9_CHINA | |
| |
155.1125 | 0.7673 | ||
| Image planes | infinity | -0.0013 |
Table 2: asphericity coefficient value
Parameters by determining in above-mentioned table 1, the table 2 provides a kind of annular aperture ultrathin optical imaging system, and gross thickness is 13mm, and the thickness of dull and stereotyped camera lens is 3.5mm, and overall diameter is 60mm.
The diaphragm of system is positioned at the annular high order aspheric surface catoptron 2 (2 ') that for the first time light is reflected to be located, and light enters system by annular clear aperture 1 (1 '), is the light ray propagation medium with the air, and repeatedly folding reflection is after the compensator imaging.After tested, the image quality evaluation result of this system is as follows:
Referring to accompanying drawing 2, it is the ray tracing point range figure that light passes through the described optical system of present embodiment, be the focusing situation of light in image planes, the size of the little square expression of the black at each place, visual field detector pixel among the figure, i.e. 3.2 μ m * 3.2 μ m, the RMS value and the encircled energy of point range figure diameter are listed in table 3.As seen from Figure 2, the point range figure of all visual fields drops in the pixel size scope substantially on the image planes, shows that this optical system has the focus characteristics that approaches the diffraction theory limit.
Table 3: point range figure size, encircled energy
Referring to accompanying drawing 3, it is the transfer curve figure of the annular aperture ultrathin optical imaging system that provides of the embodiment of the invention, the transfer curve of each visual field is all near diffraction limit among the figure, shows that at nyquist frequency 156lp/mm place mtf value greater than 0.2, concrete numerical value is referring to table 4.
Table 4: the modulation transfer function curve is at the mtf value at 156lp/mm place
Referring to accompanying drawing 4, it is the curvature of field and the distortion curve figure of the annular aperture ultrathin optical imaging system that provides of the embodiment of the invention, and as seen the relative distortion of this system is very little, less than 0.1%.
Referring to accompanying drawing 5, it is the lateral chromatic aberration curve map of the annular aperture ultrathin optical imaging system that provides of the embodiment of the invention, and as seen system's aberration is less in the service band scope, and place's lateral chromatic aberration is approximately 0.705 μ m in maximum field of view.
Claims (6)
1. annular aperture ultrathin optical imaging system, it is characterized in that: it comprises dull and stereotyped camera lens and compensator, its clear aperature is an annular; Described dull and stereotyped camera lens, front surface are plane mirror, and the rear surface is reflected light successively for being in same suprabasil four coaxial annular high order aspheric surface catoptrons; Between the forward and backward surface of dull and stereotyped camera lens, adopt the medium of air as light ray propagation; Described compensator is positioned at the center at dull and stereotyped camera lens rear surface place, and it is made up of three lens, and close dull and stereotyped camera lens rear surface is followed successively by first lens of positive light coke, second lens of negative power and the 3rd lens of positive light coke; The diaphragm of system is positioned at the annular high order aspheric surface catoptron place of for the first time light being reflected.
2. a kind of annular aperture ultrathin optical imaging system according to claim 1 is characterized in that: its service band is 486～656nm.
3. a kind of annular aperture ultrathin optical imaging system according to claim 1 is characterized in that: its focal length is 38mm.
4. a kind of annular aperture ultrathin optical imaging system according to claim 1 is characterized in that: its gross thickness is 10～15mm; The thickness of described dull and stereotyped camera lens is 3～5mm, and overall diameter is 60mm.
5. a kind of annular aperture ultrathin optical imaging system according to claim 1 is characterized in that: its object space numerical aperture is 0.7, and the ratio of obstruction is 0.79.
6. a kind of annular aperture ultrathin optical imaging system according to claim 1, it is characterized in that: it is 1.5～1.6 glass material that first of described compensator and the 3rd lens adopt refractive index, and it is 1.7～1.8 glass material that second lens adopt refractive index.
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| CN2009100322413A CN101581828B (en) | 2009-06-09 | 2009-06-09 | Annular aperture ultrathin optical imaging system |
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| CN2009100322413A CN101581828B (en) | 2009-06-09 | 2009-06-09 | Annular aperture ultrathin optical imaging system |
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| CN101581828A true CN101581828A (en) | 2009-11-18 |
| CN101581828B CN101581828B (en) | 2011-06-22 |
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| US9294672B2 (en) | 2014-06-20 | 2016-03-22 | Qualcomm Incorporated | Multi-camera system using folded optics free from parallax and tilt artifacts |
| US9374516B2 (en) | 2014-04-04 | 2016-06-21 | Qualcomm Incorporated | Auto-focus in low-profile folded optics multi-camera system |
| US9386222B2 (en) | 2014-06-20 | 2016-07-05 | Qualcomm Incorporated | Multi-camera system using folded optics free from parallax artifacts |
| US9398264B2 (en) | 2012-10-19 | 2016-07-19 | Qualcomm Incorporated | Multi-camera system using folded optics |
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| US10013764B2 (en) | 2014-06-19 | 2018-07-03 | Qualcomm Incorporated | Local adaptive histogram equalization |
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