CN107589524B - Compact long-focus television pick-up lens - Google Patents
Compact long-focus television pick-up lens Download PDFInfo
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- CN107589524B CN107589524B CN201710885063.3A CN201710885063A CN107589524B CN 107589524 B CN107589524 B CN 107589524B CN 201710885063 A CN201710885063 A CN 201710885063A CN 107589524 B CN107589524 B CN 107589524B
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Abstract
The invention provides a compact long-focus television camera lens, which comprises a double convex lens A, a gluing group formed by closely connecting a double concave lens B and a flat convex lens C, a positive crescent lens D and a negative crescent lens E, wherein the double convex lens A, the gluing group formed by closely connecting the double concave lens B and the flat convex lens C, the positive crescent lens D and the negative crescent lens E are arranged in a lens component in sequence along the direction from the input to the output of an optical path. The invention adopts a telephoto type optical structure, the length of an optical lens is less than the focal length, and the structure is compact; the aberration correction is good, the whole field of view has consistent imaging quality, the tolerance sensitivity is low, and the method is suitable for batch production.
Description
Technical Field
The invention relates to a compact long-focus television camera lens.
Background
With the increasing user demand, in many application fields, an optical system is required to have a large aperture and a long focal length in order to obtain high resolution and good image plane illuminance. For a tele optical system, curvature of field and coma are the major aberrations affecting the image quality. The larger the curvature of field and coma, the more the image quality of the edge field of view is reduced, so that realizing the good imaging quality of the whole field of view of the optical system is one of the design difficulties of the long-focus system. Meanwhile, if the image plane illumination of the optical system is not uniform, the edge brightness is much lower than the central brightness, and the dark angle appears at the edge of the imaging plane, which affects the image definition. The length of the optical system is also one of the limiting factors of the tele system.
Disclosure of Invention
The present invention is an improvement of the above-mentioned problem, that is, the technical problem to be solved by the present invention is that, in the case of the existing telephoto optical system, curvature of field and coma are major aberrations affecting image quality. The larger the curvature of field and coma, the more the image quality of the edge field is reduced, and the good imaging quality of the whole field of the optical system can not be realized.
The specific embodiment of the invention is as follows: a compact long-focus TV camera lens is composed of a biconvex lens A, a cementing group consisting of biconcave lens B and plano-convex lens C, a positive crescent lens D and a negative crescent lens E, which are sequentially arranged along the direction from input to output of light path.
Further, along the light incidence direction, the air space between the double convex lens a and the bonding group formed by closely bonding the double concave lens B and the flat convex lens C is 25.4mm, the air space between the bonding group formed by closely bonding the double concave lens B and the flat convex lens C and the positive meniscus lens D is 22.0mm, and the air space between the positive meniscus lens D and the negative meniscus lens E is 15.9 mm.
Furthermore, the negative crescent lens E is a meniscus lens and is bent to the image side, which is beneficial to the correction of curvature of field.
Further, the lens component includes a main lens cone, the biconvex lens A is fixed in the main lens cone, one end of the main lens cone is provided with an A sheet pressing ring used for limiting the biconvex lens A, the middle part of the main lens cone is provided with a focusing lens cone, the focusing lens cone is internally sleeved with a BC lens cone, the BC lens cone is provided with a C sheet pressing ring used for limiting a gluing group towards the light path output end, the rear side of the main lens cone is provided with a DE lens cone, a positive crescent lens D and a negative crescent lens E are installed in the DE lens cone, two ends of the DE lens cone are respectively provided with a D sheet pressing ring and an E sheet pressing ring so as to limit the positive crescent lens D and the negative crescent lens, the focusing lens cone is sleeved in the main lens cone through precise grinding with the main lens cone, the BC lens cone is installed in the focusing lens cone through thread pair connection, and the.
Further, the focus lens barrel is installed in the main lens barrel by precision grinding with the main lens barrel, the BC lens barrel is installed in the focus lens barrel by screw thread pair connection, and the DE lens barrel is connected in the main lens barrel by screw thread pair.
Furthermore, the outside cover of main lens cone be equipped with and install manual focusing ring, manual focusing ring front side have threaded connection in the outside focusing ring clamping ring of main lens cone in order to compress tightly the manual focusing ring outside the main lens cone, focusing lens cone periphery equipartition have focusing guide nail, manual focusing in-ring processing have a helicla flute, the width of helicla flute is closely cooperated to the focusing guide nail, manual focusing ring rotate, drive focusing guide nail through the helicla flute in the manual focusing in-ring and remove, focusing guide nail remove drive focusing lens cone along axial back-and-forth movement again to realize the manual focusing of this camera lens.
Furthermore, a long groove for installing a focusing guide nail is processed on the main lens cone, an annular groove is formed in the inner surface of the manual focusing ring, and a sealing ring is fixed in the annular groove, so that the water tightness of manual focusing is realized.
Furthermore, a long groove for installing a focusing guide nail is processed on the main lens cone, and 2 annular grooves are processed at the installation position of the manual focusing ring for installing a sealing ring and realizing the water tightness of manual focusing.
Furthermore, the curvature radius R1 of the front surface of the biconvex lens A is more than 60mm and less than R1 and less than 65mm, the curvature radius R2 of the rear surface is more than-670 mm and more than R2 and less than-660 mm, the center thickness is 12mm, and the refractive index n is more than 1.65 and more than n and less than 1.70;
the front surface curvature radius R1 of the biconcave lens B is more than-115 mm and less than R1 and less than-100 mm, the rear surface curvature radius R2 is more than 35mm and less than R2 and less than 50mm, the center thickness is 2.5mm, and the refractive index n is more than 1.80 and less than 1.85;
the front surface curvature radius R1 of the planoconvex lens C satisfies 35mm < R1 < 50mm, the rear surface curvature radius R2= ∞, the center thickness is 5mm, and the refractive index n satisfies 1.65 < n < 1.70;
the front surface curvature radius R1 of the positive crescent lens D is more than 30mm and less than R1 and less than 50mm, the rear surface curvature radius R2 is more than 77mm and less than R2 and less than 90mm, the center thickness is 6.2mm, and the refractive index n is more than 1.90 and less than n and less than 1.95;
the curvature radius R1 of the front surface of the negative crescent lens E is more than 20mm and less than R1 and less than 40mm, the curvature radius R2 of the rear surface of the negative crescent lens E is more than 18mm and less than R2 and less than 30mm, the center thickness of the negative crescent lens E is 3.6mm, and the refractive index n of the negative crescent lens E is more than 1.85 and less than n and less than 1.90.
Compared with the prior art, the invention has the following beneficial effects: the invention adopts a telephoto type optical structure, the length of an optical lens is less than the focal length, and the structure is compact; the aberration correction is good, the whole field of view has consistent imaging quality, the tolerance sensitivity is low, and the method is suitable for batch production.
Drawings
FIG. 1 is a schematic diagram of an optical system according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of the mechanism of the embodiment of the present invention.
In the figure: a-a biconvex lens A, B-a biconcave lens B, C-a plano-convex lens, D-a positive crescent lens D, E-a negative crescent lens E;
21-A sheet pressing ring, 22-main lens cone, 23-focusing lens cone, 24-focusing ring pressing ring, 25-O-shaped sealing ring, 26-focusing guide nail, 27-manual focusing ring, 28-BC lens cone, 29-C sheet pressing ring, 210-D sheet pressing ring, 211-DE lens cone and 212-E sheet pressing ring.
Detailed Description
Referring to fig. 1, a compact telephoto television camera lens includes a biconvex lens a, a cemented group formed by a biconcave lens B and a plano-convex lens C, a positive meniscus lens D, and a negative meniscus lens E sequentially arranged along an optical path from left to right incident directions.
Along the incident direction of light rays, the air space between the biconvex lens A and the bonding group formed by tightly connecting the biconcave lens B and the plano-convex lens C is 25.4mm, the air space between the bonding group formed by tightly connecting the biconcave lens B and the plano-convex lens C and the positive crescent lens D is 22.0mm, and the air space between the positive crescent lens D and the negative crescent lens E is 15.9 mm.
The curvature radius R1 of the front surface of the biconvex lens A is more than 60mm and less than R1 and less than 65mm, the curvature radius R2 of the rear surface of the biconvex lens A is more than-670 mm and more than R2 and less than-660 mm, the center thickness of the biconvex lens A is 12mm, and the refractive index n is more than 1.65 and more than n and less than 1.70;
the front surface curvature radius R1 of the biconcave lens B is more than-115 mm and less than R1 and less than-100 mm, the rear surface curvature radius R2 is more than 35mm and less than R2 and less than 50mm, the center thickness is 2.5mm, and the refractive index n is more than 1.80 and less than 1.85;
the front surface curvature radius R1 of the planoconvex lens C satisfies 35mm < R1 < 50mm, the rear surface curvature radius R2= ∞, the center thickness is 5mm, and the refractive index n satisfies 1.65 < n < 1.70;
the front surface curvature radius R1 of the positive crescent lens D is more than 30mm and less than R1 and less than 50mm, the rear surface curvature radius R2 is more than 77mm and less than R2 and less than 90mm, the center thickness is 6.2mm, and the refractive index n is more than 1.90 and less than n and less than 1.95;
the curvature radius R1 of the front surface of the negative crescent lens E is more than 20mm and less than R1 and less than 40mm, the curvature radius R2 of the rear surface of the negative crescent lens E is more than 18mm and less than R2 and less than 30mm, the center thickness of the negative crescent lens E is 3.6mm, and the refractive index n of the negative crescent lens E is more than 1.85 and less than n and less than 1.90.
The negative crescent lens E is a meniscus lens and is bent to the image side, and the correction of field curvature is facilitated.
As shown in fig. 2, the biconvex lens a is mounted in the main barrel 22 and pressed by an a-piece pressing ring 21; the bonding group formed by closely connecting the biconcave lens B and the plano-convex lens C is arranged in a BC lens cone 28 and is pressed tightly by a C-piece pressing ring 29, the BC lens cone 28 is connected and arranged in a focusing lens cone 23 through a thread pair, and the focusing lens cone 23 is arranged in a main lens cone 22 through precision grinding with the main lens cone 22; the positive crescent lens D and the negative crescent lens E are arranged in the DE lens 211 cylinder and are respectively pressed by a D-piece pressing ring 210 and an E-piece pressing ring 212, wherein the DE lens cylinder 211 is connected in the main lens cylinder 22 through a thread pair. The main lens cone 22 is provided with a manual focusing ring 27, the manual focusing ring 27 is arranged on the main lens cone 22 after being precisely ground with the main lens cone 22, and is pressed outside the main lens cone 22 by a focusing ring pressing ring 24. The main lens cone 22 is provided with a long groove for installing a focusing guide pin 26, and the installation position of the manual focusing ring 27 is provided with 2 annular grooves for installing an O-shaped sealing ring 25, so that the water tightness of manual focusing is realized. 2 focusing guide pins 26 which are uniformly distributed at 180 degrees are fixed on the focusing lens barrel 23. A spiral groove is processed in the manual focusing ring 27, and the width of the spiral groove is tightly matched with the focusing guide nail 26. When the manual focusing ring 27 rotates, the spiral groove in the manual focusing ring 27 drives the focusing guide pin 26 to move, and the focusing guide pin 26 moves to drive the focusing lens barrel 23 to move back and forth, so that the manual focusing of the lens is realized.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
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 effect 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.
If the terms "first," "second," etc. are used herein to define parts, those skilled in the art will recognize that: the terms "first" and "second" are used merely to distinguish one element from another in a descriptive sense and are not intended to have a special meaning unless otherwise stated.
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 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, 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 solutions of the present invention and not to limit the same; 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 (6)
1. A compact long-focus television pick-up lens is characterized in that a lens component consists of a biconvex lens A, a bonding group formed by a biconcave lens B and a plano-convex lens C which are sequentially arranged along the direction from the input to the output of an optical path, a positive crescent lens D and a negative crescent lens E;
the curvature radius R1 of the front surface of the biconvex lens A is more than 60mm and less than R1 and less than 65mm, the curvature radius R2 of the rear surface of the biconvex lens A is more than-670 mm and more than R2 and less than-660 mm, the center thickness is 12mm, and the refractive index n is more than 1.65 and more than n and less than 1.70;
the front surface curvature radius R1 of the biconcave lens B is more than-115 mm and less than R1 and less than-100 mm, the rear surface curvature radius R2 is more than 35mm and less than R2 and less than 50mm, the center thickness is 2.5mm, and the refractive index n is more than 1.80 and less than 1.85;
the front surface curvature radius R1 of the planoconvex lens C satisfies 35mm < R1 < 50mm, the rear surface curvature radius R2= ∞, the center thickness is 5mm, and the refractive index n satisfies 1.65 < n < 1.70;
the front surface curvature radius R1 of the positive crescent lens D is more than 30mm and less than R1 and less than 50mm, the rear surface curvature radius R2 is more than 77mm and less than R2 and less than 90mm, the center thickness is 6.2mm, and the refractive index n is more than 1.90 and less than n and less than 1.95;
the curvature radius R1 of the front surface of the negative crescent lens E is more than 20mm and less than R1 and less than 40mm, the curvature radius R2 of the rear surface of the negative crescent lens E is more than 18mm and less than R2 and less than 30mm, the center thickness of the negative crescent lens E is 3.6mm, and the refractive index n of the negative crescent lens E is more than 1.85 and less than n and less than 1.90.
2. A compact tele television camera lens as claimed in claim 1, wherein: the negative crescent lens E is a meniscus lens and is bent to the image side, which is beneficial to the correction of field curvature.
3. A compact tele television camera lens as claimed in claim 1, wherein: the lens component comprises a main lens cone, the biconvex lens A is fixed in the main lens cone, one end of the main lens cone is provided with an A sheet pressing ring used for limiting the biconvex lens A, the middle part of the main lens cone is provided with a focusing lens cone, the focusing lens cone is internally sleeved with a BC lens cone, the BC lens cone is provided with a C sheet pressing ring used for limiting a gluing group towards the light path output end, the rear side of the main lens cone is provided with a DE lens cone, a positive crescent lens D and a negative crescent lens E are installed in the DE lens cone, two ends of the DE lens cone are respectively provided with a D sheet pressing ring and an E sheet pressing ring so as to limit the positive crescent lens D and the negative crescent lens E, the focusing lens cone is precisely ground and sleeved in the main lens cone through the main lens cone, the BC lens cone is installed in the focusing lens cone through a thread pair connection.
4. A compact tele television camera lens as claimed in claim 3, wherein: the manual focusing ring is sleeved outside the main lens barrel, the front side of the manual focusing ring is provided with a focusing ring pressing ring in threaded connection with the outside of the main lens barrel so as to tightly press the manual focusing ring outside the main lens barrel, focusing guide nails are uniformly distributed on the periphery of the focusing lens barrel, spiral grooves are processed in the manual focusing ring and are tightly matched with the width of the spiral grooves, when the manual focusing ring rotates, the spiral grooves in the manual focusing ring drive the focusing guide nails to move, and the focusing guide nails move to drive the focusing lens barrel to move back and forth along the axial direction, so that the manual focusing of the lens is realized.
5. The compact telephoto television camera lens according to claim 4, wherein the main barrel is formed with a long groove for installing the focusing guide pin, and an annular groove is formed on an inner surface of the manual focusing ring, and a sealing ring is fixed in the annular groove to realize water tightness of manual focusing.
6. The compact telephoto television camera lens as claimed in claim 5, wherein the main barrel is formed with a long groove for installing the focusing guide pin, and 2 annular grooves are formed at the installation position of the manual focusing ring for installing the sealing ring to achieve water tightness of manual focusing.
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| CN201710885063.3A CN107589524B (en) | 2017-09-26 | 2017-09-26 | Compact long-focus television pick-up lens |
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| CN201710885063.3A CN107589524B (en) | 2017-09-26 | 2017-09-26 | Compact long-focus television pick-up lens |
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| CN107589524B true CN107589524B (en) | 2020-05-19 |
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| CN110261982A (en) * | 2019-07-03 | 2019-09-20 | 福建福光天瞳光学有限公司 | Infrared lens and its assembly method with detachable-type sealed structure |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102466871A (en) * | 2010-11-16 | 2012-05-23 | 佳能株式会社 | Zoom lens and optical device |
| CN105068215A (en) * | 2015-08-14 | 2015-11-18 | 福建福光股份有限公司 | Low-distortion high-resolution day and night lens |
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| KR20160094224A (en) * | 2015-01-30 | 2016-08-09 | 삼성전자주식회사 | Rear conversion lens |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102466871A (en) * | 2010-11-16 | 2012-05-23 | 佳能株式会社 | Zoom lens and optical device |
| CN105068215A (en) * | 2015-08-14 | 2015-11-18 | 福建福光股份有限公司 | Low-distortion high-resolution day and night lens |
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