CN210072177U - Continuous zooming television lens - Google Patents

Abstract

The utility model provides a zoom TV camera lens in succession, the lens figure is few, realizes high quality formation of image through less volume and weight. The utility model discloses a continuous zooming TV lens, which meets the demand of the handheld device on the continuous zooming high-definition TV lens through simple optical structure and material combination; the number of the optical system glass is effectively controlled by adding the middle fixing group between the zooming group and the compensation group, so that the volume and the weight of a compression system are achieved, the requirement of handheld equipment on a continuous zooming high-definition television system is finally met, and the device is compact in structure, light in weight, high in transmittance and good in practicability.

Description

Continuous zooming television lens

Technical Field

The utility model relates to an optical lens technical field, concretely relates to TV camera lens zooms in succession for the hand-held device.

Background

The fixed-focus high-definition television lens is wide in use, simple in design and low in cost, but cannot meet the requirements of large-view-field searching and small-view-field tracking or identification, so that the use is limited; the high-definition television lens with double view fields or multiple view fields can meet the requirements of large view field searching and small view field tracking or identification, but a target is lost easily during view field switching during use, so that the use is defective; the continuous zooming high-definition television lens can meet the requirements of large-view-field searching and small-view-field tracking or identification, can keep a target continuously enlarged or reduced in the zooming process, and has great advantages in use, so that the continuous zooming high-definition television lens has good use prospects on handheld equipment. In recent years, infrared detection techniques such as infrared thermal imaging have been widely used in military, industrial, and civil fields. Meanwhile, the measurement requirements at other wave bands are getting larger and larger, and the handheld device which only comprises the infrared thermal imager cannot meet the current measurement requirements. Besides an infrared imager, the current handheld device also integrates a high-definition television lens, a laser range finder, a Beidou positioning module and the like. Therefore, the handheld device has strict requirements on the weight and the volume of the lens besides the requirements on the action distance, the zoom magnification and the like. There are demands for high resolution, high transmittance, high integration, and light weight for the zoom lens integrated in the handheld device. Therefore, there is a need for a continuous zoom television lens for a handheld device that is small and lightweight.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides a continuous zoom lens for a television, which has a small number of lenses and realizes high-quality imaging with a small volume and weight.

In order to achieve the above object, the present invention provides a continuous zoom lens for a television, comprising a front set, a zoom set, a middle fixing set and a compensation set, wherein the middle fixing set is arranged between the zoom set and the compensation set;

the front group comprises a front group cemented lens and a front group single lens, wherein the front group single lens is a lens with n less than or equal to 1.49 and dispersion coefficient gamma more than or equal to 81;

the variable power group comprises a variable power single lens and a variable power cemented mirror, the variable power single lens is a negative lens which is bent towards the image surface direction, the variable power cemented mirror comprises a lens with the refractive index n being more than or equal to 1.9 and the dispersion coefficient gamma being less than or equal to 21 and a lens with the refractive index n being more than or equal to 1.74 and less than or equal to 1.9;

the middle fixed group comprises a lens with the refractive index n being more than or equal to 1.9 and the dispersion coefficient gamma being less than or equal to 21 and a thick lens, wherein the lens is bent to the image surface, and the thick lens is close to the image surface;

the compensation group comprises a compensation cemented mirror and a compensation single lens, and the compensation cemented mirror faces away from the image surface curvature.

Wherein, the front of the middle fixed group is provided with a variable aperture diaphragm.

The compensation single lens is bent to the image surface.

Wherein, the middle fixed group also comprises a lens with the refractive index n not less than 1.9 and the dispersion coefficient gamma not more than 21; the lens with the refractive index n not less than 1.9 and the dispersion coefficient gamma not more than 21 is made of H-ZF62 glass, and the thick lens is made of k9 glass.

Wherein, the front group of the cemented mirror adopts the combination of dense flint ZF3 glass and dense crown ZK9 glass.

Wherein, fluorite or H-FK61 glass is adopted as the front group single lens.

Wherein, the zoom group single lens adopts dense crown glass lanthanum; the zoom group cemented mirror adopts the combination of lanthanum flint glass and heavy flint glass.

Wherein, the compensating group cemented mirror adopts the combination of barium crown glass and lanthanum flint glass, and the compensating group single lens adopts dense crown glass.

Has the advantages that:

the utility model discloses a continuous zooming TV lens, which meets the demand of the handheld device on the continuous zooming high-definition TV lens through simple optical structure and material combination; the number of the optical system glass is effectively controlled by adding the middle fixing group between the zooming group and the compensation group, so that the volume and the weight of a compression system are achieved, the requirement of handheld equipment on a continuous zooming high-definition television system is finally met, and the device is compact in structure, light in weight, high in transmittance and good in practicability.

Drawings

FIG. 1 is an exemplary continuous zooming HD TV lens component of the present invention;

FIG. 2 is a short-focus example of the continuous zooming high-definition TV lens of the present invention;

FIG. 3 is an example of a short focus in a continuous zooming high definition television lens of the present invention;

fig. 4 is an example of the middle focus of the continuous zooming high definition television lens of the present invention;

fig. 5 is a long focus example in the continuous zooming high definition television lens of the present invention;

fig. 6 is a long-focus example of the continuous zooming high-definition television lens of the present invention.

Detailed Description

The present invention will be described in detail below with reference to the drawings and examples.

The utility model discloses a zoom TV camera lens in succession adopts simple optical structure, and the total length of compression optics obtains higher optical resolution through glass material and face type combination, shortens the basis of the total length of system optics as far as possible on, reduces system's glass quantity, improves system's transmissivity and system's optical resolution to reach the requirement that improves detection range and improve the image quality, be applicable to 1920 x 1080 specification image forming device.

As shown in fig. 1, the lens of the present invention includes a front group 1, a zoom group 2, a middle fixing group 3, and a compensation group 4. Wherein the variable-magnification group 2 and the compensation group 4 realize the variable-magnification requirement of the system, and the middle fixed group 3 plays a constant amplification role on the compensation group. The zoom group 2 is amplified by the middle group 3 by a fixed multiplying power through the moved focal shift amount, and then compensation is performed through the movement of the compensation group 4, so that the position of an image plane is ensured not to change, and the object image exchange principle is met.

In order to realize the continuous change of the focal length, the front group 1 also considers the focusing function, realizes the focusing requirements on different distance targets, and compensates the adjustment of different object distances to the focusing amount. The variable aperture stop is located in front of the middle fixed group 3. The middle fixing group 3 is adopted between the zoom group 2 and the compensation group 4, so that the number of lenses of the optical system can be effectively reduced, the transmittance of the system is improved, and the weight of the system is reduced.

The utility model discloses a continuous zooming television lens, which comprises a front group 1, a zooming group 2, a middle fixed group 3 and a compensation group 4, and is characterized in that the middle fixed group 3 is arranged between the zooming group 2 and the compensation group 4;

the front group 1 comprises a front group cemented lens 1-1 and a front group single lens 1-2, wherein the front group single lens 1-1 is a lens with n less than or equal to 1.49 and the dispersion coefficient gamma more than or equal to 81;

the variable power group 2 comprises a variable power single lens 2-1 and a variable power cemented mirror 2-2, the variable power single lens 2-1 is a negative lens bending to the image surface direction, the variable power cemented mirror 2-2 comprises a lens with the refractive index n being more than or equal to 1.9 and the dispersion coefficient gamma being less than or equal to 21 and a lens with the refractive index n being more than or equal to 1.74 and less than or equal to 1.9;

the middle fixed group comprises a lens with the refractive index n being more than or equal to 1.9 and the dispersion coefficient gamma being less than or equal to 21 and a thick lens, wherein the lens is bent to the image surface, and the thick lens is close to the image surface; wherein the thick lens is a lens with the ratio of the central thickness to the diameter being more than 0.45;

the compensation group 4 comprises a compensation cemented mirror 4-1 and a compensation single lens 4-2, the compensation cemented mirror 4-1 faces away from the image surface curvature, and the compensation single lens 4-2 bends toward the image surface.

Specifically, as shown in fig. 2 to 6, the present embodiment includes twelve lenses, and realizes system magnification variation and focusing. The front group 1 comprises a front group cemented lens 1-1 and a front group single lens 1-2, wherein the front group cemented lens 1-1 adopts a combination of a piece of heavy flint glass and a piece of heavy crown glass to perform achromatization, and meanwhile, the optical power bearing capacity of the front group is improved, and the embodiment adopts a combination of the heavy flint ZF3 glass and the heavy crown ZK9 glass; the front group of single lenses 1-2 adopts fluorite or H-FK61 glass, so that the secondary spectrum and other aberrations of the optical system are effectively reduced, and the resolution of the lens is obviously improved. The zoom group 2 comprises a zoom group single lens 2-1 and a zoom group cemented mirror 2-2, the zoom group single lens 2-1 adopts a negative lens bent towards the diaphragm direction, and the material adopts dense crown lanthanum glass; the zoom group cemented lens 2-2 is a cemented lens with negative focal power, and lanthanum flint glass and heavy flint glass are effectively combined, so that the light concentration and large-amplitude deflection degree of the zoom group is reduced, and the aberration concentration degree of the zoom group is reduced.

The middle fixed group 3 comprises three separated single lenses 3-1, 3-2 and 3-3, primary aberration brought by the zoom group is compensated, and the material adopts ultra-low dispersion glass, ultra-low dispersion glass and crown glass to combine and correct the primary aberration and the secondary spectrum. In the embodiment, the ultralow-dispersion glass is H-ZF62 glass, so that aberrations such as a secondary spectrum of an optical system are effectively reduced, the resolution of a lens is remarkably improved, and the crown glass is k9 glass.

The compensation group 4 comprises a cemented lens 4-1 and a compensation single lens 4-2, compensates the image plane movement caused by the movement amount of the variable power group 2, and simultaneously comprehensively corrects the residual aberration of the system. The cemented mirror 4-1 adopts barium crown glass and lanthanum flint glass which are combined and bent towards the diaphragm direction, the compensation single lens 4-2 adopts dense crown glass and is bent towards the image plane for compensating image plane movement caused by the movement amount of the variable power group, and residual aberration of the system is comprehensively corrected.

The continuous zooming television lens meets the requirements of the handheld infrared observation instrument on the volume and the weight through smaller volume and weight, and l/f is less than 0.9; the method realizes higher system transmittance and higher resolution, finally meets the requirement on longer acting distance, and the MTF is more than or equal to 0.4@100 lp/mm. The requirement of 15 times of optical zooming is realized through fewer lenses, and the following technical indexes are achieved: focal length is 10 mm-150 mm, and zoom ratio is 15 times; the relative aperture D/f is 1/2.8-1/4.5; the field angle is 38.4 degrees multiplied by 22.2 degrees to 2.7 degrees multiplied by 1.5 degrees; a 200-thousand pixel camera is adapted.

In summary, the above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A continuous zooming television lens comprises a front group (1), a zooming group (2), a middle fixed group (3) and a compensation group (4), and is characterized in that the middle fixed group (3) is arranged between the zooming group (2) and the compensation group (4);

the front group (1) comprises a front group cemented lens (1-1) and a front group single lens (1-2), wherein the front group single lens (1-2) is a lens with n less than or equal to 1.49 and dispersion coefficient gamma more than or equal to 81;

the variable power group (2) comprises a variable power single lens (2-1) and a variable power cemented mirror (2-2), the variable power single lens (2-1) is a negative lens bending to the image surface direction, the variable power cemented mirror (2-2) comprises a lens with the refractive index n being more than or equal to 1.9 and the dispersion coefficient gamma being less than or equal to 21 and a lens with the refractive index n being more than or equal to 1.74 and less than or equal to 1.9;

the middle fixed group comprises a lens with the refractive index n being more than or equal to 1.9 and the dispersion coefficient gamma being less than or equal to 21 and a thick lens, wherein the lens is bent to the image surface, and the thick lens is close to the image surface;

the compensation group (4) comprises a compensation cemented lens (4-1) and a compensation single lens (4-2), and the compensation cemented lens (4-1) faces away from the image surface.

2. Continuous zoom television lens according to claim 1, characterized in that a variable aperture stop is provided in front of the intermediate fixed group (3).

3. A continuous zoom television lens as claimed in claim 1, characterized in that the compensating einzel lens (4-2) is curved towards the image plane.

4. The afc lens according to claim 1, wherein the intermediate fixed group (3) further comprises a lens having a refractive index n ≥ 1.9 and a dispersion coefficient γ ≤ 21; the lens with the refractive index n not less than 1.9 and the dispersion coefficient gamma not more than 21 is made of H-ZF62 glass, and the thick lens is made of k9 glass.

5. Continuous zoom television lens as claimed in claim 1, characterized in that the front group of cemented lenses (1-1) uses a combination of heavy flint type ZF3 glass and heavy crown type ZK9 glass.

6. A zoom lens system as recited in claim 1, wherein the front group single lens (1-2) is made of fluorite or H-FK61 glass.

7. A zoom lens as claimed in claim 1, characterized in that the variable power single lens (2-1) is made of dense crown lanthanum; the zoom cemented mirror (2-2) adopts the combination of lanthanum flint glass and heavy flint glass.

8. A zoom lens as claimed in claim 1, characterized in that the compensating cemented mirror (4-1) is made of a combination of barium crown and lanthanum flint glass, and the compensating single lens (4-2) is made of dense crown glass.

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