CN2627530Y

CN2627530Y - High power prospect telescope

Info

Publication number: CN2627530Y
Application number: CN 03254885
Authority: CN
Inventors: 赵斌
Original assignee: Huazhong University of Science and Technology
Current assignee: Huazhong University of Science and Technology
Priority date: 2003-07-18
Filing date: 2003-07-18
Publication date: 2004-07-21
Anticipated expiration: 2013-07-18

Abstract

The utility model discloses a high-power prospect telescope which comprises an objective lens, an eye lens, and a micro-lens array angular beam expander arranged in front of the objective lens. The utility model exhibits between technological effects if the following conditions are met: the micro-lens array angular beam expander is arranged as close as possible to the objective lens without contact therebetween; the aperture of the micro-lens array angular beam expander is larger than that of the object lens of the telescope thereafter; the plane of the micro-lens array angular beam expander is vertical to the optical axis of the telescope. The total angular magnification times of the telescope is increased by the combination of the angular magnification effects of the micro-lens array angular beam expander and the common telescope. The micro-lens array angular beam expander helps to duplicate the increase in the total angular magnification without substantially increasing the total length of the telescope. Therefore, the low-power prospect telescope can be equipped with an N-power micro-lens array angular beam expander to produce a high-power prospect telescope.

Description

The high power short telescope

Technical field

The utility model relates to a kind of telescope, specifically, is a kind of high power short telescope.This telescope is made of conventional telescope and a kind of micro lens array type angle beam expander.

Background technology

Conventional telescope is a kind of optical instrument of classics, and it is made up of object lens and eyepiece.Conventional telescope has following character:

The focus in object space F2 of the rear focus F1 of object lens OL and eyepiece EL near but do not overlap (Fig. 1), distant objects becomes a virtual image S ' after the telescope ocular imaging, about 250 millimeters to 3 meters of this virtual image S ' apart from eyepiece EL, particular location eyesight that the person is different according to the observation and different observation habits and difference, change the length of lens barrel by the observer, the interval that had both changed object lens and eyepiece is regulated.

The angular magnification of the virtual image that telescope becomes

M=objective focal length f1/ eyepiece focal length f2 (1)

Telescopical optical tube length

L=objective focal length f1-eyepiece focal length f2 (2)

If telescopical field angle is W, then telescopical aperture

D＝2L×tg(W) (3)

Therefore, when conventional telescope improves when enlargement factor, because eyepiece focal length f2 can not become, so objective focal length f1 must increase, thereby, optical tube length L must increase, and lens barrel aperture D must increase, Here it is now binoculars the reason of very long lens barrel is all arranged.

Summary of the invention

The purpose of this utility model is to provide a kind of high power short telescope that can overcome above-mentioned defective, and it has solved the oversize problem of existing binoculars lens barrel, has reached the effect of the short tube of high power.

High power short telescope of the present utility model, a kind of high power short telescope comprises object lens and eyepiece, is provided with micro lens array type angle beam expander before the described object lens.

When satisfying following condition, the utlity model has better technique effect: micro lens array type angle beam expander is near object lens, but both do not contact; The aperture of micro lens array type angle beam expander is greater than telescopical objective aperture thereafter; The plate face of micro lens array type angle beam expander is vertical with telescopical optical axis.

The telescopical course of work of the utility model is such: when the light beam that a bit sends on the distant objects is come telescope, it runs into micro lens array angle beam expander earlier, because the distance of object is greater than telescopical bore, therefore, incident beam can be regarded planar light as, character by micro lens array angle beam expander knows, from angle beam expander outgoing also be planar light, just the angle angle of radiation direction and telescope optic axis has increased.Enter telescopical object lens, eyepiece more successively from the planar light of angle beam expander outgoing, become one to be the virtual image of the human eye distance of distinct vision (250 millimeters ~ 3 meters) at last apart from eyepiece, because the increase effect of the angle that micro lens array angle beam expander emits beam to object, this virtual image are big during than direct telescopic observation.From above process as can be known, system's child's hair twisted in a knot-childhood enlargement factor is amplified owing to the angle of micro lens array angle beam expander and the common contribution of the angle amplification of conventional telescope increases.Owing to added micro lens array angle beam expander, substantially do not increased under the situation at system's total length, total angular magnification increases exponentially, like this, just can join N micro lens array angle beam expander doubly, obtain a high power short telescope with a low power short telescope.

Description of drawings

Fig. 1 conventional telescope synoptic diagram; Among the figure: f1 is the focal length of object lens, and f2 is the focal length of eyepiece, and T is the interval of positive negative lens, and F1 is the focus of object lens, and F2 is the focus of eyepiece, and S ' is a distant place object through the virtual image that telescope became.

Fig. 2 is the principle schematic of micro lens array type angle beam expander; Among the figure: f1 is the focal length of positive lens, and f2 is the focal length of negative lens, and T is the interval of positive negative lens, and F is the public focus of positive lens and negative lens.

Fig. 3 is the structural representation of micro lens array type angle beam expander; Among the figure: the 1st, the positive lens plane of refraction, the 2nd, the negative lens plane of refraction, ab is the large aperture planar light beam of incident, a ' b ' is the small-bore planar light beam of outgoing, open circles is represented the focal point F 1 of positive lens (left surface), black circle is represented the focal point F 2 on negative lens (right surface), and open circles is concentric with black circle.

Fig. 4 is the synoptic diagram of the telescopical example of the utility model.

Embodiment

The function of angle beam expander is the exit plane light that the planar light of a certain direction incident is transformed into other direction, and the angle of incident light, emergent light and optical axis satisfies fixing enlargement factor.The angle beam expander is that one positive one negative two lens that overlapped by focus or lens combination constitute that (Fig. 2 a), when a branch of planar light is incident on the positive lens on the left side with angle θ, it is focused on the focal plane of positive lens, convergent point to the distance of optical axis is f1 * θ, because the focus of positive lens overlaps with the focus of negative lens, therefore, this converging beam is after the negative lens refraction, will become an exit plane light, and its direction (Fig. 2 b) is f1 * θ/f2=M * θ.

Adopt the job operation of micro lens array, can make positive micro lens array and negative micro lens array respectively, and be that zero principle forms little angle beam expander array (Fig. 3) by focal power on the both sides of a thin slice base material.Because the thickness of each little angle beam expander is all very little, so the thickness of micro lens array angle beam expander is also very little.

Chinese invention patent application " a kind of array type angle beam expander " is asked for an interview in further specifying of angle beam expander, and application number is 03128299.7, and the applying date is on July 8th, 2003.

The utility model constitutes a kind of new telescope before micro lens array angle beam expander is placed the object lens of conventional telescope, and the angular magnification that this telescopical child's hair twisted in a knot-childhood enlargement factor equals micro lens array angle beam expander multiply by the angular magnification of conventional telescope.Because always greater than 1, therefore, new telescopical child's hair twisted in a knot-childhood enlargement factor has increased the angular magnification of micro lens array angle beam expander, but because the very thin thickness of micro lens array angle beam expander, so new telescopical gross thickness does not increase.

As shown in Figure 4, the utility model combines a micro lens array type angle beam expander with a conventional telescope, constitute a novel telescope.This telescopical advantage is to have big angle enlargement factor and short optical tube length simultaneously.

When requiring below telescopical structure of the present utility model satisfies, telescope has better technique effect:

1) aperture of micro lens array type angle beam expander is greater than telescopical thereafter objective aperture.

2) position of micro lens array type angle beam expander is before telescopical object lens, and the interval between them should be as far as possible little under discontiguous situation.

3) the plate face of micro lens array type angle beam expander is vertical with telescopical optical axis.

Fig. 4 is a telescopical example of the utility model, wherein, convex surface radius=the 0.400mm of micro lens array type angle beam expander, concave=0.1091903mm, thickness=0.856mm, aperture=0.44mm, material refractive index n=1.5168, each lenticule center is by positive triangle arranged distribution, centre distance rc=0.40mm.Angular magnification=2 of this micro lens array type angle beam expander

Conventional telescope object lens parameter is: left surface radius-of-curvature r1=29.4275mm, surface curvature radius r 2=129.7195mm, thickness d 1=4mm, material refractive index n=1.5168.The eyepiece parameter is: left surface radius-of-curvature r3=-11.56544mm, surface curvature radius r 4=-50mm, thickness d 2=3mm, material refractive index n=1.5168.Object lens and eyepiece interval T=40mm.Objective aperture 22mm, eyepiece aperture=11mm.Micro lens array type angle beam expander and object lens are g=2mm at interval.The angular magnification of this conventional telescope=2.43

Angular magnification=2 * the 2.43=4.86 of the utility model telescope example.

Claims

1, a kind of high power short telescope comprises object lens and eyepiece, it is characterized in that: be provided with micro lens array type angle beam expander before the described object lens.

2, high power short telescope according to claim 1 is characterized in that: described micro lens array type angle beam expander is near object lens, but both do not contact.

3, high power short telescope according to claim 1 and 2 is characterized in that: the aperture of described micro lens array type angle beam expander is greater than telescopical objective aperture thereafter.

4, high power short telescope according to claim 1 and 2 is characterized in that: the plate face of described micro lens array type angle beam expander is vertical with telescopical optical axis.

5, high power short telescope according to claim 3 is characterized in that: the plate face of described micro lens array type angle beam expander is vertical with telescopical optical axis.

6, high power short telescope according to claim 1 and 2, it is characterized in that: described micro lens array type angle beam expander constitutes the face array by n identical angle beam expander assembly, n 〉=2, each assembly is made of positive lenticule and negative lenticule, and the focal length of positive and negative lens and the whole focal power that should satisfy at interval each lens combination that is made of positive lenticule and corresponding negative lenticule thereof are zero; Distance in the array between the center of arbitrary lenticular center and contiguous microlens equates.