CN1920608A

CN1920608A - Ultraviolet object lens in aperture wide wave range for ultraviolet detection

Info

Publication number: CN1920608A
Application number: CN 200610031014
Authority: CN
Inventors: 黄翌敏; 龚海梅
Original assignee: Shanghai Institute of Technical Physics of CAS
Current assignee: Shanghai Institute of Technical Physics of CAS
Priority date: 2006-09-11
Filing date: 2006-09-11
Publication date: 2007-02-28
Anticipated expiration: 2026-09-11
Also published as: CN100406951C

Abstract

The invention relates to an ultraviolet object lens with large relative aperture and wide wave range, used in ultraviolet detector, wherein said object lens uses coaxial transmission structure; from object to image, there are first, second, third, forth, fifth lens, stop, sixth, seventh, eighth, and ninth lens to form complex dual-gauss front lens group; and the tenth and eleventh lens form astigmatic curvature correct back lens group; all lens use standard spherical surfaces; since the signal of target has wider wave range, and the front lens group uses several cemented lens, the object lens has large relative aperture and reduced chromatic aberration. The invention has the advantages that: it can avoid central stop, to simplify production and installment; and all lens are spherical, to reduce the producing hardness and realize large relative aperture and wide working wave range.

Description

A kind of Ultraviolet object lens in aperture wide wave range that is used for ultraviolet detector

Technical field

The present invention relates to optical element, system, be meant that specifically a kind of is the Ultraviolet object lens in aperture wide wave range that uses in the middle-size and small-size imaging device of core parts with linear array or face battle array ultraviolet detector.

Background technology

Generally the ultraviolet ray more than the 200nm is divided three classes: UV-A (320～400nm), UV-B (280～320nm), UV-C (200～280nm).So-called broadband ultraviolet object lens is meant that service band comprises more than one ultraviolet object lens of above-mentioned ultraviolet band.For realizing the working range of broad, existing ultraviolet object lens adopts reflection configuration more, but the optical system of this class formation is subjected to stray light easily.In addition, there is central obscuration in coaxial reflection configuration, and the off axis reflector structure is higher to matching requirements.Existing refraction type ultraviolet object lens generally has only less relative aperture under the condition of color difference eliminating, the low job requirement that is difficult to satisfy ultraviolet detector of illuminance of image plane.

Summary of the invention

The objective of the invention is to overcome above-mentioned the deficiencies in the prior art and provide one volume is less and relative aperture can reach 1: 1.6, have the ultraviolet object lens of broad service band, these object lens can be used for the imaging of ultraviolet linear array or planar array detector.

Ultraviolet object lens in aperture wide wave range of the present invention is as shown in Figure 1: object lens adopt coaxial transmittance structure, constitute complicated double gauss type front lens group by first lens 1, second lens 2, the 3rd lens 3, the 4th lens 4, the 5th lens 5, diaphragm 12, the 6th lens 6, the 7th lens 7, the 8th lens 8, the 9th lens 9 successively in order from object space to picture side; Constitute astigmatism curvature of field correction rear lens group by the tenth lens the 10, the 11 lens 11, all lens curved surfaces all adopt the standard sphere.Wherein first and third, six, nine, 11 lens are negative lens, and second, four, five, seven, eight, ten lens are positive lens, and the Abbe constant of positive lens is greater than the Abbe constant of negative lens.

First, second lens 1,2 in the said front lens group are formed a balsaming lens; Three, the 4th lens 3,4 are formed a balsaming lens; Six, the 7th lens 6,7 are formed a balsaming lens; Eight, the 9th lens 8,9 are formed a balsaming lens.Because the signal from target has wider wave range, front lens group adopts a plurality of balsaming lenss, can make to effectively reduce aberration when object lens have object lens of large relative aperture.

Light beam from target looks like imaging on 13 detectors of plane through converging to behind first lens 1, second positive lens 2, the 3rd lens 3, the 4th lens 4, the 5th lens 5, diaphragm 12, the 6th lens 6, the 7th lens 7, the 8th lens 8, the 9th lens 9, the tenth lens the 10, the 11 lens 11 successively.

The 5th lens 5 of mainly bearing focal power in the front lens group are placed near the diaphragm, reduce the height of its surperficial incident ray, reduce the aberration that its produces by the lens that are positioned at its front.

Complicated double gauss type front lens group has been born the most focal power of object lens, and f is the focal length of whole object lens, f _FrontBe the focal length of complicated double gauss type front lens group, both sides relation satisfies f _Front=(1～1.5) f.

The tenth positive lens 10 of astigmatism curvature of field correction rear lens group is born certain focal power and is proofreaied and correct astigmatism; The 11 negative lens 11 is proofreaied and correct the curvature of field near image planes.

First lens 1 and the 11 lens 11 adopt the transparent optical crystal material fused quartz of service band, all the other lens can adopt calcium fluoride material or fused quartz, the head and tail lens adopt the purpose of fused quartz material can be so that lens and external isolation wherein prevent the calcium fluoride lens deliquescence.

The contrast prior art, the present invention has following advantage: adopt refraction structure, the reflection configuration of comparing coaxial form does not have the influence of central obscuration; Adopt coaxial form, simplified the requirement of processing, assembling from the reflection configuration of axle; All lens surfaces are sphere, have reduced difficulty of processing; Effectively eliminate the influence of aberration, can realize the wider wave working range; Volume is less, and relative aperture is bigger;

Description of drawings

Fig. 1 is an object lens of large relative aperture broadband ultraviolet lens optical system structural drawing, d1: second lens 2 and the 3rd lens 3 spacing distances; D2: the 4th lens 4 and the 5th lens 5 spacing distances; D3: the 5th lens 5 and the 6th lens 6 spacing distances; D4: the 7th lens 7 and the 8th lens 8 spacing distances; D5: the 9th lens 9 and the tenth lens 10 spacing distances; D6: the tenth lens 10 and the 11 lens 11 spacing distances; D7: the 11 lens 11 and image planes spacing distance.

Fig. 2 is the aberration curve of present embodiment.

Fig. 3 is the lateral chromatic aberration curve of present embodiment.

Fig. 4 is the distortion curve of present embodiment.

Embodiment

According to the optical system structure shown in the accompanying drawing among the present invention 1, we have designed a Ultraviolet object lens in aperture wide wave range, and technical indicator is as follows:

Service band: 240nm～370nm

System F number: F/1.6

Visual field: ± 5.6 °

Focal length: 91.5mm

System's concrete structure such as following table 1 (mm):

Table 1

The lens numbering	The surface	Radius-of-curvature	Thickness	Material	The aperture
The lens numbering	The surface	Radius-of-curvature	Thickness	Material	The aperture		Object plane	∞	∞		∞
First lens 1	1	127.574	3.5	Fused quartz	63		Object plane	∞	∞		∞
	1	127.574	3.5	Fused quartz	63	2	65.812	0		61
	Second lens 2	1	65.812	13.5	Calcium fluoride	2	65.812	0		61	61
2		1	65.812	13.5	Calcium fluoride	-232.962	2.2		60		61
2		The 3rd lens 3	1	-568.9	3.5	-232.962	2.2		60	Fused quartz	58
2	53.147		1	-568.9	3.5	0		54		Fused quartz	58
2	53.147		The 4th lens 4	1	53.147	0		54	10.5	Calcium fluoride	54
2	468.933	1		1	53.147		53		10.5	Calcium fluoride	54
2	468.933	1		The 5th lens 5	1		53	68.5	8	Calcium fluoride	51
2	320.6	1			1	59		68.5	8	Calcium fluoride	51
2	320.6	1			Diaphragm	59		∞	8.79		48.7
The 6th lens 6	1	-183.65	3	Fused quartz	Diaphragm	47		∞	8.79		48.7
	1	-183.65	3	Fused quartz	2	47	41.98	0		47
	The 7th lens 7	1	41.98	10	2	Calcium fluoride	41.98	0		47	47
2		1	41.98	10	330	Calcium fluoride	0.35		47		47
2		The 8th lens 8	1	41.407	330	10	0.35		47	Calcium fluoride	47
2	1923.1		1	41.407	0	10		45		Calcium fluoride	47
2	1923.1		The 9th lens 9	1	0	1923.1		45	3	Fused quartz	45
2	160.92	44.2		1		1923.1	44		3	Fused quartz	45
2	160.92	44.2		The tenth lens 10		1	44	25.441	5.5	Calcium fluoride	24
2	232.161	3.5			22	1		25.441	5.5	Calcium fluoride	24
2	232.161	3.5			22	The 11 lens 11	1	-27.834	2	Fused quartz	21
2	45.68	6.85		20			1	-27.834	2	Fused quartz	21
2	45.68	6.85		20			Image planes	∞

Claims

1. Ultraviolet object lens in aperture wide wave range that is used for ultraviolet detector, comprising: positive lens, negative lens and diaphragm is characterized in that:

Constitute complicated double gauss type front lens group by first lens (1), second lens (2), the 3rd lens (3), the 4th lens (4), the 5th lens (5), diaphragm (12), the 6th lens (6), the 7th lens (7), the 8th lens (8), the 9th lens (9) successively from object space in order to picture side; Constitute astigmatism curvature of field correction rear lens group by the tenth lens (10), the 11 lens (11), all lens curved surfaces all adopt the standard sphere; Wherein first and third, six, nine, 11 lens are negative lens (1,3,6,9,11), and second, four, five, seven, eight, ten lens are positive lens (2,4,5,7,8,10), and the Abbe constant of positive lens is greater than the Abbe constant of negative lens;

Light beam from target looks like imaging on the detector of plane (13) through converging to behind first lens (1), second lens (2), the 3rd lens (3), the 4th lens (4), the 5th lens (5), diaphragm (12), the 6th lens (6), the 7th lens (7), the 8th lens (8), the 9th lens (9), the tenth lens (10), the 11 lens (11) successively.

2. according to a kind of Ultraviolet object lens in aperture wide wave range that is used for ultraviolet detector of claim 1, it is characterized in that: first, second lens in the said front lens group (1,2) are formed a balsaming lens; Three, the 4th lens (3,4) are formed a balsaming lens; Six, the 7th lens (6,7) are formed a balsaming lens; Eight, the 9th lens (8,9) are formed a balsaming lens.

3. according to a kind of Ultraviolet object lens in aperture wide wave range that is used for ultraviolet detector of claim 1, it is characterized in that: said first lens (1) and the 11 lens (11) adopt the transparent optical crystal material fused quartz of service band, and all the other lens can adopt calcium fluoride material or fused quartz material.