Large-view-field, large-image-plane and large-aperture optical device capable of continuously zooming
By designing a large field of view, large image surface, large aperture and continuously zooming optical device, the problem of unclear imaging of existing lenses under low illumination conditions is solved, and high-speed, high-definition camera and low-cost production are achieved.
Patent Information
- Application Number
- CN202422418258.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-08
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-10-08
AI Technical Summary
Existing lenses cannot achieve high-speed and high-definition video recording under low-light conditions due to their small field of view, small imaging surface, and small aperture, and the imaging effect is poor during zooming.
A large-field-of-view, large-image-surface, large-aperture continuously zooming optical device was designed, which includes a front lens group, a zoom group, a compensation group, an aperture, and a rear lens group. By moving the lens group and adjusting the aperture, a large-aperture, high-throughput, and continuous zooming are achieved. Spherical lenses are used to reduce costs.
It achieves high-speed and clear video recording in dark environments, provides a large field of view and a large image surface, maintains high definition, and reduces production costs.
Smart Images
Figure CN223401098U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical instruments, in particular to an optical device with a large viewing field, a large image surface, a large aperture and continuous zooming. Background Art
[0002] Military exercises and other special environments requiring high-speed photography place high demands on lens aperture, field of view, image plane, and imaging quality at long focal lengths. However, existing lenses often suffer from narrow field of view, small imaging plane, small aperture, unclear imaging in dark environments, short focal lengths, low magnification, and the inability to maintain a fully confocal plane at each focal length during zooming. The current market lacks lenses with large apertures, large image planes, and large apertures, which cannot meet the requirements for high-speed, high-definition photography in low-light conditions. Summary of the Invention
[0003] The present disclosure provides a continuously zooming optical system with a large field of view, a large image surface, and a large aperture, which can solve the problem of quickly and flexibly recording on-site events at major events and performing still image analysis of some key instantaneous events; secondly, the large aperture has better imaging effects in darker environments and at long focal lengths.
[0004] The present disclosure provides a continuously zoomable optical device with a large field of view, a large image plane, and a large aperture, comprising: a front group, a zoom group, a compensation group, an aperture stop, a rear group, and a focal plane, which are arranged in sequence from the object plane to the image plane, wherein:
[0005] The front group can move forward and backward relative to the focal plane along the object-image direction, and the focal length of the front group is a positive value;
[0006] The zoom group can move forward and backward relative to the focal plane along the object-image direction, and the focal length of the zoom group is a negative value;
[0007] The compensation group can move forward and backward relative to the focal plane along the object-image direction, and the focal length of the compensation group is a negative value;
[0008] The aperture is fixed relative to the focal plane along the object-image direction, and its diameter varies in the direction perpendicular to the object-image direction;
[0009] The rear group is fixed relative to the focal plane, and the focal length of the rear group is a positive value;
[0010] Furthermore, the front group is provided with lens 1, lens 2 and lens 3 in sequence along the object-image direction; the zoom group is provided with lens 4, lens 5 and lens 6 in sequence along the object-image direction; the compensation group is provided with lens 7 and lens 8 in sequence along the object-image direction; the rear group is provided with lens 9, lens 10, lens 11, lens 12, lens 13, lens 14, lens 15, lens 16 and lens 17 in sequence along the object-image direction, and the lenses are all optical glass spherical lenses;
[0011] Optical glue is used to bond the opposing surfaces of lens 1 and lens 2, the opposing surfaces of lens 7 and lens 8, and the opposing surfaces of lens 16 and lens 17.
[0012] Furthermore, the optical power of the rear group of lenses 9, 10, 11, 14 and 16 arranged in sequence along the object-image direction is positive, and the optical power of the rear group of lenses 12, 13, 15 and 17 arranged in sequence along the object-image direction is negative.
[0013] Furthermore, the distance between the front group and the aperture along the object-image direction is adjustable between 165 and 175 mm; the distance between the zoom group and the aperture along the object-image direction is adjustable between 25 and 90 mm; and the distance between the compensation group and the aperture along the object-image direction is adjustable between 4 and 27 mm.
[0014] Furthermore, the design parameters of each surface from the lens 1 to the lens 17 are set as follows from the front to the back, wherein the surfaces bonded to each other use the same number:
[0015]
[0016]
[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) the effective aperture of the front group is 142mm, which is larger than the aperture of existing products of this type; by adjusting the relative spacing between the front group, the zoom group, the compensation group and the rear group, continuous zooming can be achieved, with a focal length of 50 to 200mm; the aperture diameter is 0 to 45mm, which meets the requirements of large aperture and high light throughput, and can also achieve high-speed and clear video recording in dark environments; the focal plane diameter is 30mm, which is larger than the existing products; (2) in order to achieve the high-definition effect of large field of view, large aperture and continuous zoom, some zoom lenses on the market generally use aspherical lenses, resulting in high lens costs, while the present invention uses spherical lenses, and the production cost is relatively low; (3) the image surface of zoom lenses on the market is generally small (less than φ19.05mm), which cannot meet some special requirements. The image surface of the present invention reaches φ30.2mm, which can correspond to higher resolution. Combined with the characteristics of large aperture, it can continuously provide clear image quality during the continuous zooming process. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The above and other objects, features and advantages of the present disclosure will become more apparent through a more detailed description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present disclosure.
[0019] Figure 1This is a structural diagram of an exemplary embodiment according to the present disclosure, wherein: A is the front group, B is the zoom group, C is the compensation group, D is the aperture, E is the rear group, and F is the focal plane. DETAILED DESCRIPTION
[0020] The preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.
[0021] The utility model provides a continuously zoomable optical system with a large field of view, a large image plane, and a large aperture, which solves the problem that the optical system with a small aperture, a small image plane, and a small aperture cannot ensure that each focal length is completely confocal during the zoom process. According to an exemplary embodiment of the present disclosure, as shown in the attached Figure 1 As shown:
[0022] From the object plane to the image plane, the following sequence is arranged: the front group A, the zoom group B, the compensating group C, the diaphragm D, the rear group E, and the focal plane F. The front group A moves back and forth relative to the focal plane F in the direction of the object and image, and the focal length of the front group A is positive; the zoom group B can move back and forth relative to the focal plane F in the direction of the object and image, and the focal length of the zoom group B is negative; the compensating group C can move back and forth relative to the focal plane F in the direction of the object and image, and the focal length of the compensating group C is negative; the diaphragm D is fixed relative to the focal plane F in the direction of the object and image, and its diameter changes perpendicular to the object and image direction; the rear group E is fixed relative to the focal plane F, and the focal length of the rear group is positive.
[0023] The front group A includes lenses 1, 2, and 3 arranged in sequence along the object-image direction; the zoom group B includes lenses 4, 5, and 6 arranged in sequence along the object-image direction; the compensation group C includes lenses 7 and 8 arranged in sequence along the object-image direction; the rear group E includes lenses 9, 10, 11, 12, 13, 14, 15, 16, and 17 arranged in sequence along the object-image direction; and the aperture D is arranged between the compensation group C and the rear group E.
[0024] The optical power of lens 9, lens 10, lens 11, lens 14 and lens 16 is positive, and the optical power of lens 12, lens 13, lens 15 and lens 17 is negative.
[0025] The S2 surfaces of lens 1 and lens 2 are bonded with optical UV glue; the S13 surfaces of lens 7 and lens 8 are bonded with optical UV glue; and the lens 16 and lens 17 are bonded with optical UV glue.
[0026] The distance between the front group A and the aperture D along the object-image direction is adjusted between 165 and 175 mm; the distance between the zoom group B and the aperture D along the object-image direction is adjusted between 25 and 90 mm; the distance between the compensation group C and the aperture D along the object-image direction is adjusted between 4 and 27 mm.
[0027] The specific parameter table is as follows:
[0028]
[0029]
[0030] The above technical solution is only an exemplary embodiment of the present invention. For those skilled in the art, it is easy to make various types of improvements or modifications based on the application methods and principles disclosed in the present invention, and is not limited to the methods described in the above specific embodiments of the present invention. Therefore, the method described above is only preferred and does not have a restrictive meaning.
Claims
1. A continuously zoomable optical device with a large field of view, a large image surface, and a large aperture, characterized in that: include: From the object plane to the image plane, the front group, zoom group, compensation group, diaphragm, rear group and focal plane are arranged in sequence, where: The front group can move forward and backward relative to the focal plane along the object-image direction, and the focal length of the front group is a positive value; The zoom group can move forward and backward relative to the focal plane along the object-image direction, and the focal length of the zoom group is a negative value; The compensation group can move forward and backward relative to the focal plane along the object-image direction, and the focal length of the compensation group is a negative value; The aperture is fixed relative to the focal plane along the object-image direction, and its diameter varies in the direction perpendicular to the object-image direction; The rear group is fixed relative to the focal plane, and the focal length of the rear group is a positive value.
2. The device according to claim 1, characterized in that The front group is provided with lens 1, lens 2 and lens 3 in sequence along the object-image direction; the zoom group is provided with lens 4, lens 5 and lens 6 in sequence along the object-image direction; the compensation group is provided with lens 7 and lens 8 in sequence along the object-image direction; the rear group is provided with lens 9, lens 10, lens 11, lens 12, lens 13, lens 14, lens 15, lens 16 and lens 17 in sequence along the object-image direction, and the lenses are all made of optical glass spherical lenses; Optical glue is used to bond the opposing surfaces of lens 1 and lens 2, the opposing surfaces of lens 7 and lens 8, and the opposing surfaces of lens 16 and lens 17.
3. The device according to claim 2, characterized in that The focal lengths of the rear group of lenses 9, 10, 11, 14 and 16 arranged in sequence along the object-image direction are positive, and the focal lengths of the rear group of lenses 12, 13, 15 and 17 arranged in sequence along the object-image direction are negative.
4. The device according to claim 1, characterized in that The distance between the front group and the aperture along the object-image direction is adjustable between 165 and 175 mm; the distance between the zoom group and the aperture along the object-image direction is adjustable between 25 and 90 mm; and the distance between the compensation group and the aperture along the object-image direction is adjustable between 4 and 27 mm.
5. The device according to claim 2 or 3, characterized in that From lens 1 to lens 17, the design parameters of each surface from front to back are set as follows, where the surfaces bonded to each other use the same number: 。