CN201159792Y - Multifunctional astronomical telescope object lens - Google Patents

Abstract

Disclosed is a multi-functional astronomical telescope objective lens which relates to optical lens device and conforms to the requirement of a miniaturized high performance apochromatism astronomical telescope and can also be used on a remote monitor television or digital video camera. The utility model is characterized in that the objective lens is composed of a three-piece type master objective lens (sequentially are a double-convex positive lens 1, a double-concave negative lens 2 and a double-convex positive lens 3), an optical beam deflexion and refraction device structured by three reflectors (4, 5, 6) positioned near the focal plane of the master lens and a cubic beam splitter prism (7), and a concave-convex type plane field lens. The entrance pupil is arranged at the first plane and fulfils the condition that: 1.47<n1<1.52, v1>64; 1.53<n2<1.62, 35<v2<41; 1.58<n3<1.66, 51<v3<55; 1.65<n8<1.74, 28<v8<34; 0.01<|h9/R9|-|h10/R10|<0.03, |R9|<|R10|. The optical device provides the high performance apochromatism astronomical telescope objective lens which has short transverse length and fast visual range adjusting, and can be connected with the video camera conveniently.

Description

Multi-functional astronomical telescope object lens

Technical field:

The utility model relates to optical devices, is applicable to the demand of high-performance astronomical telescope, also can be used for the remote monitor shooting optical lens that matches with television camera or digital camera.

Prior art: existing refraction type astronomical telescope is formed by object lens and eyepiece, and its complete machine structure is straight barrel type basically, and lateral length is longer.When the one-piece construction counterweight is improper, can influence the stability of complete machine, influence its vibrationproof performance.In order to match with peripherals such as computing machine, Digital Video can only be received the back of eyepiece usually, can not accomplish shooting and visual while dual-purpose.In addition,, all adopt the eyepiece component front and back to regulate, be difficult to realize electronic focusing or automatic focusing the focusing of far and near target.

We have calculated more domestic and international apochromatism astronomical telescope object lens, and the image quality of visual field, edge of finding these object lens is more than the equation of the ecentre, and its transfer function values is also poor, is unfavorable for large-scale observation.

Summary of the invention:

The purpose of this utility model is to overcome above-mentioned deficiency, provides lateral length short, and the sighting distance adjustment is quick, can be connected the multi-functional astronomical telescope object lens that imaging performance is high easily with video camera.

The solution of the present invention is: the utility model optical devices of invention are made up of three-chip type principal goods mirror, three reflective mirrors and a component bundle block prism and a slice field flattening lens.Three reflective mirrors and block prism place near the principal goods mirror focal plane, form vertically to be long cuboidal arrangement, make light beam to vertical deviation, play the effect of significantly compressing the telescope lateral length.The principal goods mirror is by (1) sheet biconvex positive lens, (2) sheet double-concave negative lens, and (3) sheet biconvex positive lens constitutes, and the material sequences of selecting for use is Qk ₃, TF ₃And ZBaF ₁(4), (5), (6) sheet are the parallel flat reflective mirror, and its reflective surface is located at front surface and is coated with visible spectrum zone high reflectance multilayer film, and the material of selecting for use is K ₉Or K ₄(7) sheet is the beam splitting block prism, and it is to be formed by two right-angle prisms gummed, the silver-plated or aluminium mirror coating in the inclined-plane of a slice prism wherein, and its saturating inverse ratio is between 0.4: 0.6 or 0.3: 0.7, and the material that uses is K ₉Field flattening lens (8) is concavo-convex negative lens, and the material of choosing usefulness is ZF ₂, the light hurdle is located on (1) face.The condition that optical devices must satisfy is as follows:

1.47＜n ₁＜1.52，υ ₁＞64……………………(1)

1.53＜n ₂＜1.62，35＜υ ₂＜41………………(2)

1.58＜n ₃＜1.66，51＜υ ₃＜55………………(3)

1.65＜n ₈＜1.71，28＜υ ₄＜34………………(4)

$0.01<\left|\frac{h_8}{{\mathrm{<figure-callout\; id="9"\; label="R"\; filenames="Y20072000608300103.png"\; state="\{\{state\}\}">R</figure-callout>}}_9}\right|-\left|\frac{h_{10}}{{\mathrm{<figure-callout\; id="10"\; label="R"\; filenames="Y20072000608300091.png"\; state="\{\{state\}\}">R</figure-callout>}}_{10}}\right|<0.03,\left|{\mathrm{<figure-callout\; id="9"\; label="R"\; filenames="Y20072000608300103.png"\; state="\{\{state\}\}">R</figure-callout>}}_9\right|<\left|{\mathrm{<figure-callout\; id="10"\; label="R"\; filenames="Y20072000608300091.png"\; state="\{\{state\}\}">R</figure-callout>}}_{10}\right|...\left(5\right).$

Advantage of the present utility model is:

Employing is inserted in three reflective mirrors vertically being long square arrangement and the structure of the positive square glass prism of beam splitting near principal goods mirror focal plane, make the scheme of lateral beam to vertical deviation, because the length of compressed lateral beam is the twice of vertical deviation light beam height, therefore can not increase under the vertically highly too many situation, can significantly compress telescopical lateral length, the vibrationproof of astronomical telescope and stability are further improved.When reflective mirror (5) and (6) when moving up and down synchronously, can change telescopical picture side intercept, therefore new departure adopts focusing mode in object lens side's to substitute traditional eyepiece mode, and the synchronous up and down movement value of reflective mirror (5) and (6) is the twice of focusing amount obviously, can realize quick focusing.Because free space is bigger longitudinally, can realizes installing the cooperation of electronic focus control and video camera and also can realize automatic focusing.The employing of beam splitting block prism can make a light beams enter eyepiece through the semi-transflective reflective face, and another Shu Guangke that sees through the semi-transflective reflective face enters the camera system of setting, realizes visual and makes a video recording and carry out simultaneously.

After introducing field flattening lens, the recoverable curvature of field and astigmatism significantly improve the image quality of edge image.

Plane mirror is coated with visible spectrum zone high reflectance multilayer film, and its reflectivity is not less than 98%.

Description of drawings:

Fig. 1 is the optical structure chart of the existing refraction type astronomical telescope of using always;

Fig. 2 is the optical texture scheme synoptic diagram of the apochromatism astronomical telescope of the utility model employing.Wherein, (1), (2), (3) sheet are the principal goods mirror; (4), (5), (6) are reflective mirror, and (7) sheet is a beam splitter prism; (8) sheet is a field flattening lens; (9) is field stop; (10) is the eyepiece group; (11) is right-angle prism; (12) is shooting switching mirror; (13) is CCD or CMOS picture pick-up device, and (14) is the entrance pupil of object lens.

Fig. 3 is that the optical texture of the apochromatism telephotolens of the utility model employing calculates synoptic diagram.Wherein, (1), (2), (3) sheet are the principal goods mirror; (4), (5), (6) are the position of reflective mirror; (7) sheet is a beam splitter prism; (8) sheet is a field flattening lens; R is the radius-of-curvature of lens; D is the thickness of lens or the airspace between lens; L ' is the rear cut-off distance of object lens.

Fig. 4 is that example of the present invention is got f '=570mm, F _NO=6.8, and colour killing spectral line d (g, f, e, in the time of c), the geometrical aberration curve map of different visual fields (on the axle, 0.5 ω, 0.707 ω, 1 ω).A is a spherical aberration, and b is astigmatism and relative distortion, and c is a ratio chromatism,, and d is the performance diagram of meridian and sagitta of arc direction.The horizontal ordinate unit of spherical aberration, astigmatism, relative distortion, ratio chromatism, is respectively mm, " number percent " and micron.The maximum ordinate unit of performance diagram is ± 10 microns.

Fig. 5 is that example of the present invention is got f '=570mm, F _NO=6.8, and colour killing spectral line d (g, f, e, in the time of c), the point range figure of different visual fields (on the axle, 0.5 ω, 0.707 ω, 1 ω).The contrast standard dimensional units of diameter is 100 microns.

Fig. 6 is that example of the present invention is got f '=570mm, F _NO=6.8, and colour killing spectral line d (g, f, e, in the time of c), the optical transfer function figure of different visual fields (on the axle, 0.5 ω, 0.707 ω, 1 ω).Horizontal ordinate unit is: line is right/and mm.

Embodiment: the novel optical device of invention is made up of toward the reflective mirror of vertical vertical segregation and a component bundle block prism and a slice field flattening lens three-chip type principal goods mirror, three-chip type light beam.The principal goods mirror is by (1) sheet biconvex positive lens, (2) sheet double-concave negative lens, and (3) sheet biconvex positive lens constitutes.(4), (5), (6) sheet is the parallel flat reflective mirror.(7) sheet is the beam splitting block prism, and (8) sheet is concavo-convex flat field negative lens.Telescopical smooth hurdle is located on first.The condition that optical devices must satisfy is as follows:

1.47＜n ₁＜1.52，υ ₁＞64……………………(1)

1.53＜n ₂＜1.62，35＜υ ₂＜41………………(2)

1.58＜n ₃＜1.66，51＜υ ₃＜55………………(3)

1.64＜n ₈＜1.71，30＜υ ₈＜34………………(4)

$0.01<\left|\frac{h_9}{{\mathrm{<figure-callout\; id="9"\; label="R"\; filenames="Y20072000608300103.png"\; state="\{\{state\}\}">R</figure-callout>}}_9}\right|-\left|\frac{h_{10}}{{\mathrm{<figure-callout\; id="10"\; label="R"\; filenames="Y20072000608300091.png"\; state="\{\{state\}\}">R</figure-callout>}}_{10}}\right|<0.03,\left|{\mathrm{<figure-callout\; id="9"\; label="R"\; filenames="Y20072000608300103.png"\; state="\{\{state\}\}">R</figure-callout>}}_9\right|<\left|{\mathrm{<figure-callout\; id="10"\; label="R"\; filenames="Y20072000608300091.png"\; state="\{\{state\}\}">R</figure-callout>}}_{10}\right|...\left(5\right).$

Setting the above-mentioned purpose that must satisfy condition is:

The purpose that condition (1), (2), (3) are set is to control the second order spectrum of principal goods mirror (spherochromatism) effectively

The purpose that condition (4) is set is to produce bigger negative three grades of curvature of field aberration coefficients (S ₄) and ratio chromatism, aberration coefficients C ₂, and make the not too little and decentraction of two sides radius-of-curvature of this sheet.

The purpose that condition (5) is set is in the curvature of field of corrective system, and it is very little that the axle that field flattening lens is born is gone up the drift angle, and it does not influence aberration and two auroral spectrums of having proofreaied and correct.

Principal character of the present utility model is:

The principal character of the optical devices of this case utility model is, setting is made up of light beam deviation device and the many mirrors of a slice flat field that three reflective mirrors and a component beam prism are long cube arrangement near principal goods mirror focal plane, make lateral beam to vertical deviation, make off-axis aberration obtain proofreading and correct simultaneously.

Table 1 is example of the present utility model: E.F.L=570mm, F _NO=6.8,2 ω=1.8 °, and colour killing spectral line d (g, f, e, c)

Table 1: each eyeglass data

Sequence number	Radius R (mm)	Thickness or airspace d (mm)	nd	υd	Title material	Clear aperture CB Φ (mm)
							Object plane	∞	∞
1	Entrance pupil face ∞	0				84
							2	395.00	10	1.487460	70.04	QK3	84
3	-538.35	0.1				83.6
							4	-626.70	6	1.612422	39.63	TF3	83.52
5	109.45	3.89				82.62
							6	114.08	12	1.622303	53.14	ZBaF1	84.44
7	-903.65	330				84.32
							8	∞	80				41.28
9	∞	35				32.32
							10	∞	80				28.66
11	∞	24	1.516374	64.07	K9	20.28

12	∞	5.76				18.62
							13	-32.32	1.2	1.672680	32.23	ZF2	18.16
14	-37	5.355				18.38
							Image planes	∞					18.02

Third-order aberration coefficients according to the telescope objective of last table data computation is:

∑S ₁＝-0.00182 ∑S ₂＝-0.00081 ∑S ₃＝0.00025 ∑S ₄＝-0.00018

∑S ₅＝-0.0061 ∑C ₁＝0.00059 ∑C ₂＝-0.00007。

Claims (2)

1, multi-functional astronomical telescope object lens, comprise that three-chip type principal goods mirror, three reflective mirrors and a component bundle block prism and a slice field flattening lens form, it is characterized in that the principal goods mirror is by (1) sheet biconvex positive lens, (2) sheet double-concave negative lens, (3) sheet biconvex positive lens constitute, and (4), (5), (6) sheet be the parallel flat reflective mirror, the beam splitting block prism of (7) sheet for forming by two right-angle prism gummeds, (8) sheet is concavo-convex negative lens field flattening lens; The light hurdle is located on (1) face, and the condition that optical devices must satisfy is as follows:

1.47＜n ₁＜1.52，υ ₁＞64……………………(1)

1.53＜n ₂＜1.62，35＜υ ₂＜41………………(2)

1.58＜n ₃＜1.66，51＜υ ₃＜55………………(3)

1.68＜n ₈＜1.74，28＜υ ₈＜34………………(4)

0.01＜|h ₉/R ₉|-|h ₁₀/R ₁₀|＜0.03，|R ₉|＜|R ₁₀|……(5)。

2, multi-functional astronomical telescope object lens according to claim 1, it is characterized in that near principal goods mirror focal plane inserting vertically be rectangle three reflective mirrors arranging and light beam deviation device and a slice field flattening lens of beam splitting block prism, increase function and improve picture quality.

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