Miniaturized video recording all-in-one machine optical system and miniaturized video recording all-in-one machine

Abstract

The invention discloses a miniaturized video recording all-in-one machine optical system and a miniaturized video recording all-in-one machine, and belongs to the technical field of photography, the miniaturized video recording all-in-one machine optical system comprises a front fixed lens group, a zoom lens group, a compensation lens group, a diaphragm, a rear fixed lens group and a filter lens group which are sequentially arranged from an object space to an image space along an optical axis direction, each lens group comprises a first lens to a seventeenth lens, the shapes of the lenses are strictly screened, various aberrations are effectively reduced and balanced, and the continuous zooming of the optical system of the video recording all-in-one machine is realized through the relative translational motion of the zoom lens group and the compensation lens group; and the zoomed light passes through four different filters, so that the optical system can perform four-mode high-definition imaging on a long-distance target. The optical system of the miniaturized video recording all-in-one machine is simple in optical structure, long in focal length, compact in structure and excellent in image quality, can be used for detecting and identifying complex environment targets in a long distance, and can also meet the requirements of the video recording all-in-one machine with relatively small requirements on the boundary dimension.

Description

Technical Field

[0001] The present invention belongs to the technical field of photography, and particularly relates to an optical system for a miniaturized video camera and a miniaturized video camera. Background Art

[0002] Video cameras are widely used in the field of airborne optoelectronic detection for obtaining target videos and photos. They can meet the search and capture of fast-flying objects at close range under a large field of view, and can also meet the tracking of medium- and low-speed long-distance flying objects under a small field of view, and can perform reconnaissance photography or key target photography on a specified area according to system instructions. It is very beneficial for searching and tracking high-speed moving targets. The video camera systems disclosed in the prior art, on the one hand, have a large external dimension and cannot meet the requirements of airborne optoelectronic detection equipment for volume and weight. On the other hand, the system structure is complex, the resolution is low, and the focal length is short, which is not conducive to detecting and identifying targets in a complex environment at a long distance. Therefore, it is particularly important to develop an optical system for a miniaturized video camera. Summary of the Invention

[0003] In view of one or more of the above defects or improvement requirements of the prior art, the present invention provides an optical system for a miniaturized video camera and a miniaturized video camera, which has a simple optical structure, a long focal length, a compact structure, and excellent image quality, and can be used for detecting and identifying targets in a complex environment at a long distance.

[0004] To achieve the above object, the present invention provides an optical system for a miniaturized video camera, which includes a front fixed lens group, a zoom lens group, a compensation lens group, a diaphragm, a rear fixed lens group, and a filter lens group sequentially arranged from the object side to the image side along the optical axis direction; The front fixed lens group includes, sequentially arranged from the object side to the image side along the optical axis direction: a first lens with a negative optical power and a meniscus structure, a second lens with a positive optical power and a meniscus structure, a third lens with a positive optical power and a biconcave structure, and a fourth lens with a positive optical power and a meniscus structure; The zoom lens group includes, sequentially arranged from the object side to the image side along the optical axis direction: a fifth lens with a positive optical power and a biconvex structure, a sixth lens with a negative optical power and a biconcave structure, and a seventh lens with a negative optical power and a biconcave structure; The compensation lens group includes, sequentially arranged from the object side to the image side along the optical axis direction: an eighth lens with a positive optical power and a biconvex structure, a ninth lens with a positive optical power and a biconvex structure, a tenth lens with a negative optical power and a meniscus structure, and an eleventh lens with a negative optical power and a meniscus structure; The zoom lens group and the compensation lens group can be translated along the optical axis to perform continuous zooming; The rear fixed lens group is arranged in sequence from the object side to the image side along the optical axis, including: a twelfth lens with a positive focal power and a meniscus structure, a thirteenth lens with a negative focal power and a double concave structure, a fourteenth lens with a positive focal power and a double convex structure, a fifteenth lens with a negative focal power and a double concave structure, a sixteenth lens with a positive focal power and a double convex structure, and a seventeenth lens with a positive focal power and a meniscus structure; The filter lens group is successively provided with a visible light filter lens, a near-infrared filter lens, a narrow-band filter lens, and a polarized light filter lens, and is switched through a filtering mechanism, so that the optical system can perform high-definition imaging and digital photography in four modes on a long-distance target.

[0005] As a further improvement of the present invention, the maximum movable distance of the zoom lens group is 76.7 mm, and the maximum movable distance of the compensating lens group is 59.74 mm; and / or, The front fixed lens group can be translated along the optical axis, and the moving distance does not exceed 6 mm.

[0006] As a further improvement of the present invention, the total optical length of the optical system does not exceed 300 mm.

[0007] As a further improvement of the present invention, the focal length f1 of the front fixed lens group satisfies: 100 mm < f1 < 150 mm; and / or, The focal length f2 of the zoom lens group satisfies: -30 mm < f2 < -15 mm; and / or, The focal length f3 of the compensating lens group satisfies: 40 mm < f3 < 55 mm.

[0008] As a further improvement of the present invention, the materials of the visible light filter lens, the near-infrared filter lens, the narrow-band filter lens, and the polarized light filter lens are respectively H-K9L, HB720, HB850, and H-K9L; and / or, The thicknesses of the visible light filter lens, the near-infrared filter lens, the narrow-band filter lens, and the polarized light filter lens are respectively 2.3 mm, 2.1 mm, 2.1 mm, and 2.3 mm.

[0009] As a further improvement of the present invention, the fifth lens and the sixth lens are cemented into a first cemented lens with a negative focal power; and / or, The ninth lens and the tenth lens are cemented into a second cemented lens with a negative focal power; and / or, The twelfth lens and the thirteenth lens are cemented into a third cemented lens with a negative focal power; and / or, The fourteenth lens and the fifteenth lens are cemented to form a fourth cemented lens with a negative optical power.

[0010] As a further improvement of the present invention, the materials selected for the first lens, the second lens, the third lens and the fourth lens are H-ZLAF78B, H-FK61B, BAF2 crystal, and H-FK95N respectively; and / or, the materials selected for the fifth lens, the sixth lens and the seventh lens are H-ZF52, H-LAK52, and H-LAK12 respectively; and / or, the materials used for the eighth lens, the ninth lens, the tenth lens and the eleventh lens are H-LAK5A, H-FK95N, H-ZF62, and H-QK3L respectively; and / or, the materials used for the twelfth lens, the thirteenth lens, the fourteenth lens, the fifteenth lens, the sixteenth lens and the seventeenth lens are H-FK61B, H-LAK1, H-ZF88, H-ZLAF2A, H-QK3L, and H-ZLAF51 respectively.

[0011] As a further improvement of the present invention, the outer diameters of the first lens to the fourth lens are 84 mm; and / or, the outer diameters of the fifth lens to the seventh lens are 40 mm; and / or, the outer diameters of the eighth lens to the eleventh lens are 40 mm; and / or, the outer diameters of the twelfth lens to the seventeenth lens are 26 mm.

[0012] As a further improvement of the present invention, the zoom lens group and the compensation lens group are translated along the optical axis to change the combined focal length so that the digital photo optical zoom ratio of the miniaturized video camera reaches 16.7 times.

[0013] Another aspect of the present invention provides a miniaturized video camera, including the above-mentioned miniaturized video camera optical system, which is used for high-definition video shooting and digital photo taking of distant targets.

[0014] As long as the above-mentioned improved technical features do not conflict with each other, they can be combined with each other.

[0015] Generally speaking, compared with the prior art, the beneficial effects of the above technical solutions conceived by the present invention include: (1) The optical system of the miniaturized video camera recorder of the present invention is sequentially provided with a front fixed lens group, a zoom lens group, a compensation lens group, a diaphragm, a rear fixed lens group, and a filter lens group along the optical axis direction from the object side to the image side. Each lens group includes the first lens to the seventeenth lens. The shapes of the lenses are strictly screened to effectively reduce and balance various aberrations. The continuous zoom of the optical system of the video camera recorder is achieved by the relative translational movement of the zoom lens group and the compensation lens group. After zooming, the light passes through four different filter lenses, enabling the optical system to perform high-definition imaging in four modes for distant targets. The optical system of the miniaturized video camera recorder of the present invention has a simple optical structure, a long focal length, a compact structure, and excellent image quality, and can be used for detecting and identifying targets in complex environments at a long distance.

[0016] (2) The optical system of the miniaturized video camera recorder of the present invention meets the requirements for a smaller external dimension of the video camera recorder by restricting various sizes. Further, by optimizing the sizes, materials, etc. of each lens and filter lens, and combining some lenses, a continuous zoom with an optical focal length range of 30 mm to 500 mm is achieved for the optical system. The optical zoom ratio for digital photography reaches 16.7 times, and the comprehensive zoom ratio for 1080P high-definition video output reaches 43 times, and the entire focal length range can meet the image plane usage requirements of 5120×5120.

[0017] (3) The miniaturized video camera recorder of the present invention includes the above-mentioned optical system of the miniaturized video camera recorder. It detects and identifies targets in complex environments at far and near distances by changing the focal length of the optical system. At the same time, it can realize two functions of high-definition television photography and digital photography. It can output high-definition video of 1920×1080P / 30fps and can also output photos with a full-frame resolution of 5120×5120. Its external dimension and weight are smaller than those of a single-function television or camera with the same specifications, and it has prominent advantages. Brief Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of the optical system of the miniaturized video camera recorder in the embodiment of the present invention; Figure 2 It is a spot diagram of visible light in the large field of view state of the optical system of the miniaturized video camera recorder in the embodiment of the present invention; Figure 3 It is a modulation transfer function diagram of visible light in the large field of view state of the optical system of the miniaturized video camera recorder in the embodiment of the present invention; Figure 4It is the spot diagram of near-infrared light under the large field of view of the optical system of the miniaturized video camera in the embodiment of the present invention; Figure 5 It is the modulation transfer function (MTF) diagram of near-infrared light under the large field of view of the optical system of the miniaturized video camera in the embodiment of the present invention; Figure 6 It is the spot diagram of visible light under the small field of view of the optical system of the miniaturized video camera in the embodiment of the present invention; Figure 7 It is the modulation transfer function (MTF) diagram of visible light under the small field of view of the optical system of the miniaturized video camera in the embodiment of the present invention; Figure 8 It is the spot diagram of near-infrared light under the small field of view of the optical system of the miniaturized video camera in the embodiment of the present invention; Figure 9 It is the modulation transfer function (MTF) diagram of near-infrared light under the small field of view of the optical system of the miniaturized video camera in the embodiment of the present invention.

[0020] In all the drawings, the same reference numerals denote the same technical features, specifically: 1. Front fixed lens group; 11. First lens; 12. Second lens; 13. Third lens; 14. Fourth lens; 2. Zoom lens group; 21. Fifth lens; 22. Sixth lens; 23. Seventh lens; 3. Compensation lens group; 31. Eighth lens; 32. Ninth lens; 33. Tenth lens; 34. Eleventh lens; 4. Rear fixed lens group; 41. Twelfth lens; 42. Thirteenth lens; 43. Fourteenth lens; 44. Fifteenth lens; 45. Sixteenth lens; 46. Seventeenth lens; 5. Filter lens group; 6. Aperture. Detailed implementation manners

[0021] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0022] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0024] In the present invention, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "connected to", "fixed" and the like should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0026] Embodiment: Please refer to Figure 1 , an optical system of a miniaturized video camera in a preferred embodiment of the present invention includes a front fixed lens group 1, a zoom lens group 2, a compensating lens group 3, a diaphragm 6, a rear fixed lens group 4, and a filter lens group 5 arranged in sequence from the object side to the image side along the optical axis direction. Natural light from the target and the background passes through the front fixed lens group 1, the zoom lens group 2, the compensating lens group 3, the diaphragm 6, the rear fixed lens group 4, and the filter lens group 5 in sequence and converges onto the image plane for imaging.

[0027] The front fixed lens group 1 is sequentially provided with a first lens 11, a second lens 12, a third lens 13, and a fourth lens 14 along the optical axis direction from the object side to the image side, and is used to converge the target scene light at the focal point of the zoom lens group 2; among them, the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14 respectively belong to a meniscus lens with a negative optical power, a meniscus lens with a positive optical power, a biconvex lens with a positive optical power, and a meniscus lens with a positive optical power. The cooperation of these four types of lens forms can effectively reduce the chromatic aberration of the system, improve the imaging quality of the system, converge the incident light, reduce the light height, and further reduce the tolerance sensitivity of the system.

[0028] Preferably, the materials used for the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14 are H-ZLAF78B, H-FK61B, BAF2 crystal, and H-FK95N respectively. The preferential cooperation of these four materials can effectively correct the lateral chromatic aberration and high-order spherical aberration of the system, and further reduce the design difficulty of the system.

[0029] Preferably, the outer diameter of each lens in the front fixed lens group 1 is 84 mm.

[0030] The zoom lens group 2 is sequentially provided with a fifth lens 21, a sixth lens 22, and a seventh lens 23 along the optical axis direction from the object side to the image side, and is used to realize the continuous zoom of the optical system; among them, the types of the fifth lens 21, the sixth lens 22, and the seventh lens 23 respectively belong to a biconvex lens with a positive optical power, a biconcave lens with a negative optical power, and a biconcave lens with a negative optical power. The cooperation of these three types of lens forms can effectively correct the residual aberration and coma of the system, and increase the focal length change range.

[0031] Preferably, the fifth lens 21 and the sixth lens 22 are glued together with photosensitive glue to form a first glued lens.

[0032] Preferably, the materials used for the fifth lens 21, the sixth lens 22, and the seventh lens 23 are H-ZF52, H-LAK52, and H-LAK12 respectively. The cooperation of these three materials is beneficial to correcting the high-order aberration of the system and ensuring good imaging during the zoom process.

[0033] Preferably, the outer diameter of each lens in the zoom lens group 2 is 40 mm.

[0034] The compensating lens group 3 is sequentially provided with an eighth lens 31, a ninth lens 32, a tenth lens 33, and an eleventh lens 34 along the optical axis from the object side to the image side, and is used for compensating the varifocal aberration of the varifocal lens group 2; among them, the types of the eighth lens 31, the ninth lens 32, the tenth lens 33, and the eleventh lens 34 respectively belong to a biconvex lens with positive optical power, a biconvex lens with positive optical power, a meniscus lens with negative optical power, and a meniscus lens with negative optical power. The forms of these four types of lenses cooperate with each other to compensate for the residual aberration and improve the imaging quality.

[0035] Preferably, the ninth lens 32 and the tenth lens 33 are glued together by photosensitive glue to form a second cemented lens.

[0036] Preferably, the materials used for the eighth lens 31, the ninth lens 32, the tenth lens 33, and the eleventh lens 34 are H-LAK5A, H-FK95N, H-ZF62, and H-QK3L respectively. The cooperation of these four materials is beneficial to the coma correction in the long focal length and the astigmatism correction in the short focal length.

[0037] Preferably, the outer diameter of each lens in the compensating lens group 3 is 40 mm.

[0038] The rear fixed lens group 4 is sequentially provided with a twelfth lens 41, a thirteenth lens 42, a fourteenth lens 43, a fifteenth lens 44, a sixteenth lens 45, and a seventeenth lens 46 along the optical axis from the object side to the image side, and is used for compensating the remaining aberration of the varifocal lens group 2 and the compensating lens group 3; among them, the types of the twelfth lens 41, the thirteenth lens 42, the fourteenth lens 43, the fifteenth lens 44, the sixteenth lens 45, and the seventeenth lens 46 respectively belong to a meniscus lens with positive optical power, a biconcave lens with negative optical power, a biconvex lens with positive optical power, a biconcave lens with negative optical power, a biconvex lens with positive optical power, and a meniscus lens with positive optical power; the forms of these six types of lenses cooperate with each other to compensate for the residual aberration and converge the incoming light to reduce the light height.

[0039] Preferably, the twelfth lens 41 and the thirteenth lens 42 are glued together by photosensitive glue to form a third cemented lens, and the fourteenth lens 43 and the fifteenth lens 44 are glued together by photosensitive glue to form a fourth cemented lens.

[0040] Preferably, the materials used for the twelfth lens 41, the thirteenth lens 42, the fourteenth lens 43, the fifteenth lens 44, the sixteenth lens 45, and the seventeenth lens 46 are H-FK61B, H-LAK1, H-ZF88, H-ZLAF2A, H-QK3L, and H-ZLAF51 respectively. The preferential cooperation of these six materials effectively reduces and corrects the lateral chromatic aberration and spherical aberration of the system, and ensures good imaging in each field of view.

[0041] Preferably, the outer diameter of each lens in the rear fixed lens group 4 is 26 mm.

[0042] The filter lens group 5 is successively provided with a visible light filter lens, a near-infrared filter lens, a narrow-band filter lens, and a polarized light filter lens, which are switched through a filtering mechanism, so that the miniaturized all-in-one machine can perform high-definition video shooting and digital photography in four modes on a distant target.

[0043] Preferably, the materials of the visible light filter lens, the near-infrared filter lens, the narrow-band filter lens, and the polarized light filter lens are respectively: H-K9L, HB720, HB850, H-K9L; preferably, the thicknesses of the visible light filter lens, the near-infrared filter lens, the narrow-band filter lens, and the polarized light filter lens are respectively: 2.3 mm, 2.1 mm, 2.1 mm, 2.3 mm. Different thicknesses are used to compensate for the parallax in the large field of view state, so as to ensure that after switching the four filter lenses in the large field of view state, the imaging of each mode is clear.

[0044] Preferably, the outer diameter of each filter lens in the filter lens group is 26 mm.

[0045] In a preferred embodiment, the focal length f1 of the front fixed lens group 1 is preferably designed to be 100 mm < f1 < 150 mm, the focal length f2 of the zoom lens group 2 is preferably designed to be -30 mm < f2 < -15 mm, and the focal length f3 of the compensating lens group 3 is preferably designed to be 40 mm < f3 < 55 mm. Through the mutual cooperation of the front fixed lens group 1, the zoom lens group 2, and the compensating lens group 3, it is ensured that the entire optical continuous zoom process is full-frame imaging, effectively controlling the system length and imaging quality, and making the system structure form compact.

[0046] Preferably, the total optical length of this optical system does not exceed 300 mm.

[0047] In a specific embodiment, the total optical length of this optical system is 300 mm, continuously zooming in the range of focal lengths from 30 mm to 500 mm, with a pixel size of 3.45 um, an F number of 5 to 6.3. The zoom lens group and the compensating lens group are translated along the optical axis to change the combined focal length to achieve an optical zoom ratio of 16.7 times for digital photography, and the comprehensive zoom ratio for 1080P high-definition video output reaches 43 times. It is suitable for detecting and identifying distant complex environment targets, and has a simple optical structure, a long focal length, a compact structure, excellent image quality, and can meet the image plane use requirements of 5120×5120 in the entire focal length range.

[0048] Preferably, this optical system adopts a compound zoom form of optical continuous zoom and stepless electronic zoom, and uses big data image scaling processing technology to cooperate with optical continuous zoom to achieve high-definition video output with a large zoom ratio.

[0049] Preferably, the zoom lens group 2 moves linearly from left to right, with the focal length changing from short to long, and its maximum movable distance being 76.7 mm; the compensating lens group 3 makes a corresponding non-linear movement, and its maximum movable distance being 59.74 mm.

[0050] In a specific embodiment, when the focal length of the optical system is 30 mm ( Figure 1 in the short and medium focal length state), the distance between the front fixed lens group 1 and the zoom lens group 2 is 9.89 mm, the distance between the zoom lens group 2 and the compensating lens group 3 is 140.22 mm, and the distance between the compensating lens group 3 and the aperture 6 is 3.71 mm; the zoom lens group 2 moves linearly from left to right, with the focal length changing from short to long, and its axial movement dimension being 76.7 mm, the compensating lens group 3 makes a corresponding non-linear movement, and the axial movement dimension being 59.74 mm. At this time, the focal length of the optical system is 500 mm ( Figure 1 in the medium and long focal length state), the distance between the front fixed lens group 1 and the zoom lens group 2 is 86.59 mm, and the distances between the zoom lens group 2 and the compensating lens group 3 are 3.77 mm respectively; the distance between the compensating lens group 3 and the aperture 6 is 63.45 mm.

[0051] Preferably, the front fixed lens group can be translated along the optical axis, and the moving distance does not exceed 6 mm, that is, the axial movement dimension from its middle position is ±3 mm, so as to facilitate observing near targets when the field of view is small and the temperature changes.

[0052] In the optical system of the miniaturized video camera recorder of the present invention, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a first cemented lens, a seventh lens 23, an eighth lens 31, a second cemented lens, an eleventh lens 34, a third cemented lens, a fourth cemented lens, a sixteenth lens 45, and a seventeenth lens 46 are sequentially arranged along the optical axis from the object side to the image side. By adopting a seventeen-piece optical structure layout form and strictly screening and selecting the shapes and materials of each lens, various aberrations are effectively reduced and balanced, realizing continuous zoom of 30 mm to 500 mm for the optical system of the video camera recorder, and the optical structure is simple, the focal length is long, the structure is compact, the image quality is excellent, and the full focal length can meet the image plane usage requirements of 5120×5120.

[0053] Preferably, the present invention further provides a miniaturized video camera recorder, including the above-mentioned optical system of the miniaturized video camera recorder. By changing the focal length of the optical system, complex environment targets at far and near distances are detected and identified. At the same time, two functions of high-definition television shooting and digital photography can be realized. It can output high-definition video of 1920×1080P / 30fps, and can also output photos with a full-frame resolution of 5120×5120. The external dimensions and weight are smaller than those of a single-function television or camera with the same specifications, and the advantages are prominent.

[0054] Figures 2 to 9They are the spot diagrams and MTF curves corresponding to the focal lengths of 30mm and 500mm in the embodiments of the present invention. It can be seen from the figures that various aberrations for different focal lengths have been well corrected. The spot size on the axis is less than 1 pixel, and the MTF on the axis is greater than 0.4 (100 lp / mm), meeting the basic requirements for the design of the optical system of the camcorder and having good imaging quality.

[0055] It is easy for those skilled in the art to understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A miniaturized camcorder optical system, characterized in that: It includes a front fixed lens group, a zoom lens group, a compensating lens group, an aperture, a rear fixed lens group, and a filter lens group which are sequentially arranged along the optical axis from the object side to the image side; The front fixed lens group is arranged in sequence from the object side to the image side along the optical axis direction, including: a first lens with negative focal power and a meniscus structure, a second lens with positive focal power and a meniscus structure, a third lens with positive focal power and a biconcave structure, and a fourth lens with positive focal power and a meniscus structure; The zoom lens group is arranged in sequence from the object side to the image side along the optical axis direction and includes: a fifth lens with positive focal power and a biconvex structure, a sixth lens with negative focal power and a biconcave structure, and a seventh lens with negative focal power and a biconcave structure; The compensation lens group is arranged in sequence from the object side to the image side along the optical axis direction and includes: an eighth lens with positive focal power and a biconvex structure, a ninth lens with positive focal power and a biconvex structure, a tenth lens with negative focal power and a meniscus structure, and an eleventh lens with negative focal power and a meniscus structure; The variable magnification lens group and the compensating lens group can be translated along the optical axis to perform continuous zooming; The rear fixed lens group is arranged in sequence from the object side to the image side along the optical axis direction, including: a twelfth lens with positive focal power and a meniscus structure, a thirteenth lens with negative focal power and a double concave structure, a fourteenth lens with positive focal power and a double convex structure, a fifteenth lens with negative focal power and a double concave structure, a sixteenth lens with positive focal power and a double convex structure, and a seventeenth lens with positive focal power and a meniscus structure; The filter group is provided with a visible light filter, a near infrared filter, a narrow band filter and a polarized light filter in sequence, which are switched by the filter mechanism so that the optical system can perform four modes of high-definition imaging and digital photography of distant targets.

2. The miniaturized camcorder optical system according to claim 1, characterized in that: The maximum movable distance of the variable magnification lens group is 76.7 mm, and the maximum movable distance of the compensating lens group is 59.74 mm; and / or, The front fixed lens group can be translated along the optical axis, and the moving distance does not exceed 6mm.

3. The miniaturized camcorder optical system according to claim 1, wherein: The total optical length of this optical system does not exceed 300mm.

4. The miniaturized camcorder optical system according to claim 1, wherein: The focal length f1 of the front fixed lens group satisfies: 100mm<f1<150mm; and / or, The focal length f2 of the zoom lens group satisfies: -30mm<f2<-15mm; and / or, The focal length f3 of the compensation lens group satisfies: 40mm<f3<55mm.

5. The miniaturized camcorder optical system according to claim 1, characterized in that: The materials used for the visible light filter, near infrared filter, narrow band filter and polarized light filter are H-K9L, HB720, HB850 and H-K9L respectively; and / or, The thicknesses of the visible light filter, near infrared filter, narrow band filter and polarized light filter are 2.3 mm, 2.1 mm, 2.1 mm and 2.3 mm respectively.

6. The miniaturized camcorder optical system according to claim 1, characterized in that: The fifth lens and the sixth lens are cemented into a first cemented lens with negative power; and / or, The ninth lens and the tenth lens are cemented into a second cemented lens with negative power; and / or, The twelfth lens and the thirteenth lens are cemented into a third cemented lens with negative power; and / or, The fourteenth lens and the fifteenth lens are cemented into a fourth cemented lens having negative power.

7. The miniaturized camcorder optical system according to claim 1, characterized in that: The materials selected for the first lens, the second lens, the third lens and the fourth lens are H-ZLAF78B, H-FK61B, BAF2 crystal and H-FK95N respectively; and / or, The materials selected for the fifth lens, the sixth lens and the seventh lens are H-ZF52, H-LAK52 and H-LAK12 respectively; and / or, The materials used for the eighth lens, the ninth lens, the tenth lens and the eleventh lens are H-LAK5A, H-FK95N, H-ZF62 and H-QK3L respectively; and / or, The materials used for the twelfth lens, the thirteenth lens, the fourteenth lens, the fifteenth lens, the sixteenth lens and the seventeenth lens are H-FK61B, H-LAK1, H-ZF88, H-ZLAF2A, H-QK3L and H-ZLAF51 respectively.

8. The miniaturized camcorder optical system according to claim 1, wherein: The outer diameter of the first to fourth lenses is 84mm; and / or, The outer diameters of the fifth to seventh lenses are 40 mm; and / or, The outer diameters of the eighth to eleventh lenses are 40 mm; and / or, The outer diameters of the twelfth to seventeenth lenses are 26 mm.

9. The miniaturized camcorder optical system according to any one of claims 1 to 8, wherein the zoom lens group and the compensation lens group are translated along the optical axis to change the combined focal length to achieve an optical zoom ratio of 16.7 times for digital photography of the miniaturized camcorder.

10. A miniaturized camcorder, characterized in that: The miniaturized camcorder optical system comprises the optical system of any one of claims 1 to 9, and is used for high-definition video and digital photography of distant targets.

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