CN214252720U - Large-aperture full-glass wide-angle fisheye lens - Google Patents
Large-aperture full-glass wide-angle fisheye lens Download PDFInfo
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- CN214252720U CN214252720U CN202023240982.1U CN202023240982U CN214252720U CN 214252720 U CN214252720 U CN 214252720U CN 202023240982 U CN202023240982 U CN 202023240982U CN 214252720 U CN214252720 U CN 214252720U
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Abstract
The utility model relates to a full glass wide angle fisheye lens of large aperture, include along the preceding group A that light incidence direction set gradually from the left hand right side, diaphragm C, back group B, parallel flat D and image plane, preceding group A is including the meniscus lens A1 of the negative power that sets gradually, the meniscus lens A2 of negative power, the first airtight cemented group that meniscus lens A3 of negative power and meniscus lens A4 of positive power constitute, the biconvex lens A5 of positive power; the rear group B comprises a second close-contact bonding group consisting of a negative-focal-power double-concave lens B1 and a positive-focal-power double-convex lens B2, a positive-focal-power double-convex lens B3, a negative-focal-power meniscus lens B4 and a positive-focal-power double-convex lens B5 which are arranged in sequence. The lens has the advantages of simple structure, small volume, 180-degree angle of field and large aperture, high resolution, can shoot a scene in a large range, and can be used with a 600-ten-thousand-pixel CCD or CMOS chip.
Description
The technical field is as follows:
the utility model relates to a full glass wide angle fisheye lens of large aperture.
Background art:
in recent years, as the application range of the imaging lens is wider, the requirements on the pixel and the field angle of the lens are higher and higher. However, the existing lens generally has the following disadvantages: the field angle is not large enough and is often less than 140 degrees, and one or even a plurality of lenses are required to be arranged to shoot the required range; the aperture is small, the requirement of the lowest imaging illumination of the CCD chip can not be met under low illumination, clear imaging can not be realized, the overall dimension is large, and the occupied space is large.
The utility model has the following contents:
the utility model discloses make the improvement to the problem that above-mentioned prior art exists, promptly the utility model aims to solve the technical problem that a large aperture full glass wide angle fisheye lens is provided.
In order to realize the purpose, the utility model discloses a technical scheme is: a large-aperture full-glass wide-angle fish-eye lens comprises a front group A, a diaphragm C, a rear group B, a parallel flat plate D and an image surface which are sequentially arranged from left to right along the light incidence direction, wherein the front group A comprises a meniscus lens A1 with negative focal power, a meniscus lens A2 with negative focal power, a first joint sealing adhesive combination consisting of a meniscus lens A3 with negative focal power and a meniscus lens A4 with positive focal power, and a biconvex lens A5 with positive focal power; the rear group B comprises a second joint sealing adhesive combination consisting of a double-concave lens B1 with negative focal power and a double-convex lens B2 with positive focal power, a double-convex lens B3 with positive focal power, a meniscus lens B4 with negative focal power and a third joint sealing adhesive combination consisting of a double-convex lens B5 with positive focal power which are arranged in sequence.
Further, the air space between the meniscus lens a1 and the meniscus lens a2 is 2.66mm to 2.67mm, the air space between the meniscus lens a2 and the meniscus lens A3 is 4.83mm to 4.84mm, and the air space between the meniscus lens a4 and the biconvex lens a5 is 0.1mm to 0.11 mm; the air space between the double-convex lens B2 and the double-convex lens B3 is 0.14mm-0.15mm, the air distance between the double-convex lens B3 and the meniscus lens B4 is 0.12mm-0.13mm, and the air space between the double-convex lens B5 and the parallel flat plate D is 0.1 mm.
Further, the total focal length of the optical system is set to f, and the focal lengths of the first tight-contact bonding group consisting of the meniscus lens a1, the meniscus lens a2, the meniscus lens A3 and the meniscus lens a4, the second tight-contact bonding group consisting of the biconvex lens a5, the biconcave lens B1 and the biconvex lens B2, and the third tight-contact bonding group consisting of the biconvex lens B3, the meniscus lens B4 and the biconvex lens B5 are sequentially set to f1, f2, f3, f4, f5, f6 and f7 along the incident direction of light, and the focal lengths of the lenses are as follows: -9.5< f1/f < -9, -7< f2/f < -6.5, -95 < f3/f <100, 11< f4/f <11.5, -23< f5/f < -22.5, 8.5< f6/f <9, 24< f7/f < 24.5.
Compared with the prior art, the utility model discloses following effect has: the lens has the advantages of simple structure, small volume, 180-degree angle of field and large aperture, high resolution, can shoot a scene in a large range, and can be used with a 600-ten-thousand-pixel CCD or CMOS chip.
Description of the drawings:
fig. 1 is a schematic structural diagram of an optical system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a visible light MTF value in an embodiment of the present invention;
fig. 3 is a schematic view of field curvature and F-Theta distortion in an embodiment of the present invention.
In the figure:
a-front group A; a 1-meniscus lens a 1; a 2-meniscus lens a 2; a3-meniscus lens A3; a 4-meniscus lens a 4; a 5-biconvex lens a 5; b-rear group B; b1-biconcave lens B1; b2-biconvex lens B2; b3-biconvex lens B3; b4-meniscus lens B4; b5-biconvex lens B5; c-diaphragm; d-parallel plates.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description of the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
As shown in fig. 1-3, the utility model relates to a full glass wide angle fisheye lens of large aperture, include along the preceding group A, diaphragm C, the back group B that set gradually from the left hand right side of light incidence direction, parallel dull and stereotyped D and IMA image plane, preceding group A is including the meniscus lens A1 that has negative focal power, the meniscus lens A2 that has negative focal power, the first airtight cemented group that meniscus lens A3 that has negative focal power and the meniscus lens A4 that has positive focal power formed, the biconvex lens A5 that has positive focal power that sets gradually; the rear group B comprises a second joint sealing adhesive combination consisting of a double-concave lens B1 with negative focal power and a double-convex lens B2 with positive focal power, a double-convex lens B3 with positive focal power, a meniscus lens B4 with negative focal power and a third joint sealing adhesive combination consisting of a double-convex lens B5 with positive focal power which are arranged in sequence.
In this embodiment, the air space between the meniscus lens a1 and the meniscus lens a2 is 2.66mm to 2.67mm, the air space between the meniscus lens a2 and the meniscus lens A3 is 4.83mm to 4.84mm, and the air space between the meniscus lens a4 and the biconvex lens a5 is 0.1mm to 0.11 mm; the air space between the double-convex lens B2 and the double-convex lens B3 is 0.14mm-0.15mm, the air distance between the double-convex lens B3 and the meniscus lens B4 is 0.12mm-0.13mm, and the air space between the double-convex lens B5 and the parallel flat plate D is 0.1 mm.
In this embodiment, the total focal length of the optical system is set to f, and the focal lengths of the first tight-contact bonding group consisting of the meniscus lens a1, the meniscus lens a2, the meniscus lens A3 and the meniscus lens a4, the second tight-contact bonding group consisting of the biconvex lens a5, the biconcave lens B1 and the biconvex lens B2, and the third tight-contact bonding group consisting of the biconvex lens B3, the meniscus lens B4 and the biconvex lens B5 are sequentially set to f1, f2, f3, f4, f5, f6 and f7 along the incident direction of light, and the focal lengths of the lenses are as follows: -9.5< f1/f < -9, -7< f2/f < -6.5, -95 < f3/f <100, 11< f4/f <11.5, -23< f5/f < -22.5, 8.5< f6/f <9, 24< f7/f < 24.5.
In this example, specific parameters of each lens are shown in table 1 below.
TABLE 1
In this embodiment, the technical indexes of the optical system are as follows: (1) focal length: EFFL =2 mm; (2) f number = 2.0; (3) the field angle: 2w is more than or equal to 180 degrees; (4) the diameter of the imaging circle is more than phi 6.6; (5) working spectral range: 430 nm-730 nm; (6) the total optical length TTL is less than or equal to 32.25mm, and the optical back intercept is more than or equal to 4.5 mm; (7) F-Theta distortion = -9%; (8) the lens is suitable for 600-800 ten thousand pixel high-resolution CCD or CMOS cameras.
In this embodiment, when the lens is in operation: when light enters, a light path sequentially enters the front group A, the diaphragm C, the rear group B and the parallel flat plate, and finally imaging is carried out on an IMA image surface; the double-convex lens A5 in the front group A is made of glass with low refractive index and high Abbe number, the double-concave lens B1 in the rear group B is made of glass with high refractive index and low Abbe number, and the meniscus lens B4 is made of glass with high refractive index and low Abbe number.
When the lens is designed, the visible spectrum of F, C, D is adopted, and the F/# is set to be 2, so that the clear aperture is large, and rapid and clear imaging can still be realized at low illumination. By reasonably distributing the focal power of 10 lenses, the total optical length of the lens is compressed while small distortion is kept, so that the optical system has a compact structure and is beneficial to saving the use cost.
The lens adopts a ten-piece structure, the focal power is reasonably distributed, the front five pieces of lenses converge the incident angle of light, and the rear five pieces of lenses carry out aberration balance. The double-convex lens A5 in the front group A adopts glass with low refractive index and high Abbe number, the double-concave lens B1 of the second joint sealing bonding group adopts glass with high refractive index and low Abbe number, and the meniscus lens B4 adopts glass with high refractive index and low Abbe number, so that when light passes through the lenses, secondary spectrum and spherical aberration can be corrected, and the lens system can be well corrected through reasonable collocation of materials.
The utility model discloses if disclose or related to mutual fixed connection's spare part or structure, then, except that other the note, fixed connection can understand: a detachable fixed connection (for example using bolts or screws) is also 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).
In addition, the terms used in any aspect of the present disclosure as described above to indicate positional relationships or shapes include similar, analogous, or approximate states or shapes unless otherwise stated.
The utility model provides an arbitrary part both can be assembled by a plurality of solitary component parts and form, also can be the solitary part that the integrated into one piece technology was made.
Finally, it should be noted that: the above embodiments 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, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (3)
1. The utility model provides a full glass wide angle fisheye lens of large aperture which characterized in that: the optical lens system comprises a front group A, a diaphragm C, a rear group B, a parallel flat plate D and an image surface which are sequentially arranged from left to right along the incident direction of light, wherein the front group A comprises a first joint sealing adhesive group consisting of a meniscus lens A1 with negative focal power, a meniscus lens A2 with negative focal power, a meniscus lens A3 with negative focal power and a meniscus lens A4 with positive focal power, and a double convex lens A5 with positive focal power; the rear group B comprises a second joint sealing adhesive combination consisting of a double-concave lens B1 with negative focal power and a double-convex lens B2 with positive focal power, a double-convex lens B3 with positive focal power, a meniscus lens B4 with negative focal power and a third joint sealing adhesive combination consisting of a double-convex lens B5 with positive focal power which are arranged in sequence.
2. The wide-angle fisheye lens with large aperture and full glass of claim 1, characterized in that: the air space between the meniscus lens A1 and the meniscus lens A2 is 2.66mm-2.67mm, the air space between the meniscus lens A2 and the meniscus lens A3 is 4.83mm-4.84mm, and the air space between the meniscus lens A4 and the biconvex lens A5 is 0.1mm-0.11 mm; the air space between the double-convex lens B2 and the double-convex lens B3 is 0.14mm-0.15mm, the air distance between the double-convex lens B3 and the meniscus lens B4 is 0.12mm-0.13mm, and the air space between the double-convex lens B5 and the parallel flat plate D is 0.1 mm.
3. The large-aperture full-glass wide-angle fish-eye lens of claim 2, wherein: setting the total focal length of the optical system as f, setting the focal lengths of a first closely-connected adhesive combination consisting of a meniscus lens A1, a meniscus lens A2, a meniscus lens A3 and a meniscus lens A4, a second closely-connected adhesive combination consisting of a biconvex lens A5, a biconcave lens B1 and a biconvex lens B2, a biconvex lens B3, a meniscus lens B4 and a biconvex lens B5 as f1, f2, f3, f4, f5, f6 and f7 in sequence along the incident direction of light rays, wherein the focal lengths of the lenses are as follows: -9.5< f1/f < -9, -7< f2/f < -6.5, -95 < f3/f <100, 11< f4/f <11.5, -23< f5/f < -22.5, 8.5< f6/f <9, 24< f7/f < 24.5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023240982.1U CN214252720U (en) | 2020-12-29 | 2020-12-29 | Large-aperture full-glass wide-angle fisheye lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023240982.1U CN214252720U (en) | 2020-12-29 | 2020-12-29 | Large-aperture full-glass wide-angle fisheye lens |
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| Publication Number | Publication Date |
|---|---|
| CN214252720U true CN214252720U (en) | 2021-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023240982.1U Active CN214252720U (en) | 2020-12-29 | 2020-12-29 | Large-aperture full-glass wide-angle fisheye lens |
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| Country | Link |
|---|---|
| CN (1) | CN214252720U (en) |
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- 2020-12-29 CN CN202023240982.1U patent/CN214252720U/en active Active
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