CN205539664U - Electronic view finder camera lens - Google Patents

Abstract

The utility model discloses an electronic view finder camera lens, including lens cone (100), lens cone (100) in from lower supreme first lens (1), second lens (2) and third lens (3) of being equipped with in proper order, first lens (1) be the plastics positive lens, second lens (2) be the plastics negative lens, third lens (3) be the plastics positive lens, lens cone (100) on be equipped with and supply the people to observe logical unthreaded hole (200) examined, logical unthreaded hole (200) and third lens (3) between be equipped with the focus for positive prism (4), prism (4) be the aspheric surface towards third lens (3) and face of leading to unthreaded hole (200), prism (4) on be used for the face (4a) of light beam to be the complete reflective surface. The utility model discloses compact structure, sexual valence relative altitude realize image quality high definition virtual image.

Description

A kind of electronic viewfinder camera lens

[technical field]

This utility model relates to a kind of electronic viewfinder camera lens.

[background technology]

View finder is that people usually ignore but the most critically important camera components, is commonly applied to the virtual of digital camera Viewing optical camera lens, it is possible to be applied to newfangled wear-type high-definition intelligent SmartMovie, equip different types of view finder The most just determine the class of the type of camera, even camera.The electronic viewfinder popular and popular because of single electricity camera has it only Special structure and pluses and minuses.Along with the progress of electronic technology, electronic viewfinder can be more and more universal, and the performance of electronic viewfinder is also Can gradually step up.

Electronic viewfinder (EVF, Electronic Viewfinder) generally disadvantage is that angle of visual field phase at present To less, image display details is not apparent from, and claps group picture and does not sees that someone eyes are opened or semi-closure.Market The upper conventional EVF angle of visual field concentrates near 20 °, and dioptric range of accommodation is limited, and structure is many with glass lens, its cost High.

Therefore, this utility model is based on above deficiency and produces.

[utility model content]

This utility model purpose is to overcome the deficiencies in the prior art, it is provided that a kind of angle of visual field up to 30 °, Diopter accommodation model Being trapped among-5D to+2D, resolution is the electronic viewfinder camera lens of 1024*768, and this lens construction is compact, cost performance is high, it is achieved draw Matter high-definition virtual imaging.The present invention combines actual production technology and requires can be mass-produced, and can be used for digital camera and wear-type Virtual viewing optical camera lens in high definition SmartMovie.

This utility model is achieved through the following technical solutions:

A kind of electronic viewfinder camera lens, it is characterised in that: include lens barrel 100, in described lens barrel 100 the most successively Being provided with the first lens the 1, second lens 2 and the 3rd lens 3, the first described lens 1 are plastics plus lens, the second described lens 2 is plastics minus lens, and the 3rd described lens 3 are plastics plus lens, and described lens barrel 100 is provided with the logical light for eye-observation Hole 200, being provided with focal length between described light hole 200 and the 3rd lens 3 is positive prism 4, and described prism 4 is saturating towards the 3rd The face of mirror 3 and light hole 200 is aspheric surface, and the face 4a described prism 4 being used for reflect light is fully reflecting surface.

Electronic viewfinder camera lens as above, it is characterised in that: the first described lens 1 are near the one of the second lens 2 Face is nonreentrant surface, and the second described lens 2 are concave surface near the one side of the 3rd lens 3, and the 3rd described lens 3 are near prism The one side of 4 is nonreentrant surface, and first described lens the 1, second lens 2 and the surface of the 3rd lens 3 are aspheric surface.

Electronic viewfinder camera lens as above, it is characterised in that: described electronic viewfinder camera lens meets condition :-1.5 <f₁/f₂₃< 0 ,-3.5 < f₁/f₂< 0 ,-1.0 < f₂/f₃< 0 ,-1.0 < f₃/f₄< 0, wherein, f₁、f₂、f₃、f₄Respectively the first lens 1, Second lens the 2, the 3rd lens 3 and the focal length of prism 4, f₂₃It is the second lens 2 and combined focal length of the 3rd lens 3.

Electronic viewfinder camera lens as above, it is characterised in that: described electronic viewfinder camera lens meets condition: Vd_{lens 1}>=30, Vd_{lens 2}≤ 30, Vd_{lens 4}>=30, Vd_{lens 1}-Vd_{lens 2}> 20, Vd_{lens 3}-Vd_{lens 2}> 10, wherein Vd_{lens 1}、Vd_{lens 2}、Vd_{lens 3}、Vd_{lens 4}It is respectively the first lens the 1, second lens the 2, the 3rd lens 3 and dispersion system of prism 4 Number.

Electronic viewfinder camera lens as above, it is characterised in that: between described the first lens 1 and the second lens 2 Airspace is 0.1mm, and the described airspace between the second lens 2 and the 3rd lens 3 is 1.23mm, and described the 3rd is saturating Airspace between mirror 3 and prism 4 is 0.1mm.

Electronic viewfinder camera lens as above, it is characterised in that: set between described the first lens 1 and the second lens 2 There is the first spacer ring 5, between described the 3rd lens 3 and prism 4, be provided with the second spacer ring 6.

Electronic viewfinder camera lens as above, it is characterised in that: described lens barrel 100 is provided with prism 4 reinforcing Fixture 300.

Electronic viewfinder camera lens as above, it is characterised in that: it is provided with filter between described light hole 200 and prism 4 Mating plate 7.

Electronic viewfinder camera lens as above, it is characterised in that: described electronic viewfinder lens imaging is in distance At 2.3m, image height is 50inch.

Electronic viewfinder camera lens as above, it is characterised in that: first described lens the 1, second lens the 2, the 3rd lens 3 and prism 4 non- Spherical face shape meets below equation: $Z={\mathrm{cy}}^2/\{1+\sqrt{\&lsqb;1-(1+k)c2y2\&rsqb;}\}+{\mathrm{\&alpha;}}_1{y}^2+{\mathrm{\&alpha;}}_2{y}^4+{\mathrm{\&alpha;}}_3{y}^6+{\mathrm{\&alpha;}}_4{y}^8+{\mathrm{\&alpha;}}_5{y}^{10}+{\mathrm{\&alpha;}}_6{y}^{12}+{\mathrm{\&alpha;}}_7{y}^{14}+{\mathrm{\&alpha;}}_8{y}^{16},$ In public affairs In formula, parameter c is the curvature corresponding to radius, and y is radial coordinate, and its unit is identical with length of lens unit, and k is circular cone secondary Curve coefficients；When k-factor is less than-1, the face sigmoid curves of lens is hyperbola, and when k-factor is equal to-1, the face shape of lens is bent Line is parabola；When k-factor is between-1 to 0, the face sigmoid curves of lens is oval, when k-factor is equal to 0, lens Face sigmoid curves is circular, and when k-factor is more than 0, the face sigmoid curves of lens is oblate；α₁To α₈Represent each radial coordinate respectively Corresponding coefficient.

Compared with prior art, this utility model has the following advantages:

1, this utility model can realize ultrahigh resolution 1024*768, and chip uses OLED screen curtain, and imaging definition is high.

2, the two sides of this utility model prism uses optical aspherical surface design, can play the work correcting each monochromatic aberration With, also realize the constraint to field aperture size simultaneously.

3, this utility model more crucially due in the present invention one side of prism be fully reflecting surface, to whole optical system Light path play the effect of turnover, effectively save space, thus the advantage that the contour structure size that reaches the present invention is little.

4, this utility model uses plastic aspherical element structure, uses plastic cement eyeglass, reduces cost.With shortening light path Method make view finder enlargement ratio uprise.Make up various aberration with only several eyeglasses, improve the angle of visual field and picture element, and The Geometrical MTF of optical system is greatly improved, and the taxes and profits degree of this product, transmitance, color reducibility can be made to obtain It is obviously improved.

[accompanying drawing explanation]

Fig. 1 is this utility model schematic diagram；

Fig. 2 is transfer curve figure of the present utility model.

Fig. 3 is the curvature of field of the present utility model and distortion curve figure.

Fig. 4 is vertical axial aberration curve chart of the present utility model.

[detailed description of the invention]

Below in conjunction with the accompanying drawings this utility model is further described:

A kind of electronic viewfinder camera lens, including lens barrel 100, is sequentially provided with first in described lens barrel 100 saturating from bottom to up Mirror the 1, second lens 2 and the 3rd lens 3, the first described lens 1 are plastics plus lens, and the second described lens 2 are born for plastics Lens, the 3rd described lens 3 are plastics plus lens, and described lens barrel 100 is provided with the light hole 200 for eye-observation, institute Being provided with focal length between light hole 200 and the 3rd lens 3 stated is positive prism 4, and described prism 4 is towards the 3rd lens 3 and leads to The face of unthreaded hole 200 is aspheric surface, and the face 4a described prism 4 being used for reflect light is fully reflecting surface.The material of the first lens 1 Material is PMMA material, and its focal length is just.The material of the second lens 2 is OKP4HT material, and its focal length is negative, can improve well Curvature of field aberration.3rd lens 3 are biconvex lens, and material is E48R.Prism 4 is fully reflecting surface for reflecting the face 4a of light, right Decisive role is played in shortening in whole optical system structure, and two other face of prism 4 is aspheric surface, effectively to optics System plays the effect of aberration correction.First lens 1 are plus lens, and it can reduce the incident ray bore to system front end, The angle of visual field making system becomes big, and the second lens 2 are minus lens, the effective coma controlling whole optical system and aberration.The Three lens 3 are plus lens, and positive minus lens is crisscross arranged and can effectively reduce the length of optical system.And the first lens 1 He Distortion can effectively be corrected by the symmetrical structure of the 3rd lens 3 the two plus lens, it is ensured that image quality, make the angle of visual field up to 30°。

The first described lens 1 are nonreentrant surface near the one side of the second lens 2, and the second described lens 2 are saturating near the 3rd The one side of mirror 3 is concave surface, and the 3rd described lens 3 are nonreentrant surface near the one side of prism 4, the first described lens 1, second The surface of lens 2 and the 3rd lens 3 is aspheric surface.

Described electronic viewfinder camera lens meets condition :-1.5 < f₁/f₂₃< 0 ,-3.5 < f₁/f₂< 0 ,-1.0 < f₂/f₃< 0 ,- 1.0<f₃/f₄< 0, wherein, f₁、f₂、f₃、f₄It is respectively the first lens the 1, second lens the 2, the 3rd lens 3 and focal length of prism 4, f₂₃ It is the second lens 2 and combined focal length of the 3rd lens 3.The length of optical system can be by increasing the refractive index of the first lens 1 Effectively reduce.If but refractive index is too big, the highest aberration can be caused.The negative refraction of the rear end face of the second lens 2 Rate is used for correcting the aberration that optical system generates.And electronic viewfinder camera lens meets above-mentioned condition and can make electronic viewfinder camera lens Size reach balance with its lens error correction.In this utility model, when the first lens the 1, second lens 2 and the 3rd lens 3 Focal length meet formula :-3.5 < f₁/f₂< 0 ,-1.0 < f₂/f₃< when 0, the focal length distribution that can solve this utility model structure is asked Topic and tolerance distributing equilibrium sex chromosome mosaicism, can effectively realize the system angle of visual field and greatly and reduce structural tolerance tender subject.

Described electronic viewfinder camera lens meets condition: Vd_{lens 1}>=30, Vd_{lens 2}≤ 30, Vd_{lens 4}>=30, Vd_{lens 1}- Vd_{lens 2}> 20, Vd_{lens 3}-Vd_{lens 2}> 10, wherein Vd_{lens 1}、Vd_{lens 2}、Vd_{lens 3}、Vd_{lens 4}Be respectively the first lens 1, the Two lens the 2, the 3rd lens 3 and the abbe numbers of prism 4.The second described lens 2 and the 3rd lens 3 are respectively adopted little dispersion system The minus lens of number and the plus lens combination of big abbe number, can effectively correct aberration and distortion, improve image quality, in phase With there being apparent perfect imaging effect under pixel.

The described airspace between the first lens 1 and the second lens 2 is 0.1mm, the second described lens 2 and the 3rd Airspace between lens 3 is 1.23mm, and the described airspace between the 3rd lens 3 and prism 4 is 0.1mm.

Be provided with the first spacer ring 5 between described the first lens 1 and the second lens 2, the 3rd described lens 3 and prism 4 it Between be provided with the second spacer ring 6.First spacer ring 5 is to control the distance between the first lens 1 and the second lens 2 well, the second spacer ring 6 Play the effect of elimination system veiling glare.Diaphragm is human eye, and there is the longest distance diaphragm distance camera lens front end, this camera lens diopter Range of accommodation wide, normal human eye, myopia and hypermetropia use all without being affected.

Described lens barrel 100 is provided with the fixture 300 reinforcing prism 4.

It is provided with optical filter 7 between described light hole 200 and prism 4.This optical filter 7 is fixed in lens barrel 100, to camera lens Have certain protective effect, also filter a part of light simultaneously, make image color beautiful and sharp keen while there is good color Color reproducibility, in addition to this optical filter 7 problem in terms of solving color, it is ensured that entering smoothly of packaging technology below OK.

Described electronic viewfinder lens imaging is at distance 2.3m, and image height is 50inch.

First described lens the 1, second lens the 2, the 3rd lens 3 and the aspherical surface shape of prism 4 meet with lower section Journey: $Z={\mathrm{cy}}^2/\{1+\sqrt{\&lsqb;1-(1+k)c2y2\&rsqb;}\}+{\mathrm{\&alpha;}}_1{y}^2+{\mathrm{\&alpha;}}_2{y}^4+{\mathrm{\&alpha;}}_3{y}^6+\mathrm{\&alpha;}$ ${}_4{y}^8+{\mathrm{\&alpha;}}_5{y}^{10}{\mathrm{\&alpha;}}_6{y}^{12}+{\mathrm{\&alpha;}}_7{y}^{14}+{\mathrm{\&alpha;}}_8{y}^{16},$ At formula In, parameter c is the curvature corresponding to radius, and y is radial coordinate, and its unit is identical with length of lens unit, and k is that circular cone secondary is bent Linear system number；When k-factor is less than-1, the face sigmoid curves of lens is hyperbola, when k-factor is equal to-1, and the face sigmoid curves of lens For parabola；When k-factor is between-1 to 0, the face sigmoid curves of lens is oval, when k-factor is equal to 0, and the face of lens Sigmoid curves is circular, and when k-factor is more than 0, the face sigmoid curves of lens is oblate；α₁To α₈Represent each radial coordinate institute respectively Corresponding coefficient.

Table 1 is the structural parameters table of utility model electronic viewfinder camera lens

Table 1

Table 2 is that each aspheric surface of the first lens 1 and the second lens 2 loses the high ratio range with radius R

Table 2

Table 3 is that each aspheric surface of the 3rd lens 3 and prism 4 loses the high ratio range with radius R

Table 3.

Claims (9)

1. an electronic viewfinder camera lens, it is characterised in that: include lens barrel (100), depend on from bottom to up in described lens barrel (100) Secondary the first lens (1), the second lens (2) and the 3rd lens (3) of being provided with, described the first lens (1) are plastics plus lens, described The second lens (2) be plastics minus lens, the 3rd described lens (3) are plastics plus lens, and described lens barrel (100) is provided with For the light hole (200) of eye-observation, being provided with focal length between described light hole (200) and the 3rd lens (3) is positive prism (4), described prism (4) is aspheric surface towards the face of the 3rd lens (3) and light hole (200), and described prism (4) is upper to be used It is fully reflecting surface in the face (4a) of reflection light.

Electronic viewfinder camera lens the most according to claim 1, it is characterised in that: described the first lens (1) are near second The one side of lens (2) is nonreentrant surface, and described the second lens (2) are concave surface near the one side of the 3rd lens (3), described the Three lens (3) are nonreentrant surface near the one side of prism (4), described the first lens (1), the second lens (2) and the 3rd lens (3) Surface be aspheric surface.

Electronic viewfinder camera lens the most according to claim 2, it is characterised in that: described electronic viewfinder camera lens meets bar Part :-1.5 < f₁/f₂₃< 0 ,-3.5 < f₁/f₂< 0 ,-1.0 < f₂/f₃< 0 ,-1.0 < f₃/f₄< 0, wherein, f₁、f₂、f₃、f₄It is respectively the One lens (1), the second lens (2), the 3rd lens (3) and the focal length of prism (4), f₂₃It is the second lens (2) and the 3rd lens (3) Combined focal length.

4. according to the electronic viewfinder camera lens described in claim 1 or 2 or 3, it is characterised in that: described electronic viewfinder camera lens Meet condition: Vd_{lens 1}>=30, Vd_{lens 2}≤ 30, Vd_lens4>=30, Vd_{lens 1}-Vd_{lens 2}> 20, Vd_{lens 3}-Vd_{lens 2}> 10, Wherein Vd_{lens 1}、Vd_{lens 2}、Vd_{lens 3}、Vd_{lens 4}It is respectively the first lens (1), the second lens (2), the 3rd lens (3) and rib The abbe number of mirror (4).

Electronic viewfinder camera lens the most according to claim 4, it is characterised in that: described the first lens (1) are saturating with second Airspace between mirror (2) is 0.1mm, and the airspace between described the second lens (2) and the 3rd lens (3) is 1.23mm, the described airspace between the 3rd lens (3) and prism (4) is 0.1mm.

Electronic viewfinder camera lens the most according to claim 5, it is characterised in that: described the first lens (1) are saturating with second It is provided with the first spacer ring (5) between mirror (2), between described the 3rd lens (3) and prism (4), is provided with the second spacer ring (6).

Electronic viewfinder camera lens the most according to claim 6, it is characterised in that: described lens barrel (100) is provided with rib The fixture (300) that mirror (4) is reinforced.

Electronic viewfinder camera lens the most according to claim 6, it is characterised in that: described light hole (200) and prism (4) Between be provided with optical filter (7).

Electronic viewfinder camera lens the most according to claim 4, it is characterised in that: described electronic viewfinder lens imaging exists At distance 2.3m, image height is 50inch.