CN206133048U

CN206133048U - Zero blind area diffuse reflection formula photoelectricity receiver lens based on TIR lens

Info

Publication number: CN206133048U
Application number: CN201621159413.5U
Authority: CN
Inventors: 许用疆
Original assignee: SHANGHAI LANBAO SENSING TECHNOLOGY Co Ltd
Current assignee: SHANGHAI LANBAO SENSING TECHNOLOGY Co Ltd
Priority date: 2016-11-01
Filing date: 2016-11-01
Publication date: 2017-04-26
Anticipated expiration: 2026-11-01

Abstract

The utility model provides a zero blind area diffuse reflection formula photoelectricity receiver lens based on TIR lens, includes plane installation bottom surface, be equipped with on the installation bottom surface to supply photodiode to install the recess in it, and the photodiode in installation and the recess is on one side and the optical axis coplane, and photodiode's surface and optical axis mutually perpendicular, the recess internal surface forms the emitting face, and the plane of the top surface of lens forms the incident surface, and the outer wall of lens forms the plane of reflection, and wherein outer wall and internal surface have the one side at least for the aspheric surface, inside the great light incidence in the angle of incidence peers into lens to lens top surface backfolding, incide the receipt face that is located behind the recess after the outer wall reflection, inside the less light incidence in the angle of incidence peered into lens to lens top surface backfolding, the face above the recess assembled the receipt face that lies in behind the recess, and the angle distribution is satisfied: the light of the angle of incidence 10~90 assembles the face of receipt via the reflection of lens outer wall, and the convex surface on the light process recess upper portion of the angle of incidence 0~70 assembles the face of receipt.

Description

The zero blind area diffuse-reflectance formula opto-electronic receiver lens based on TIR lens

Technical field

This utility model belongs to optical sensor technology field, the more particularly to zero blind area diffuse-reflectance formula based on TIR lens Opto-electronic receiver lens.

Background technology

Diffuse-reflectance formula photoelectric sensor is one of sensor for industrially whetheing there is using most common detecting object, and it is integrated Transmitting and reception are integrated.When object enters the detection zone of sensor settings, there is diffuse-reflectance, reflection in light in body surface Light falls on the photodiode after receiving terminal lens focuss, and now sensor can judge there is object, exports a switch letter Number.

According to the rules of image formation of lens, will not deviation through the radiation direction of lens pricipal point.Assume receiving lens and photoelectricity The relative position of diode is constant, and the angle of incidence of near objects reflected light is larger, and picture after the lens is larger, needs photoelectricity two Pole pipe is positioned on the position of picture, receives such optical signal；In the same manner, the angle of incidence of distant objects reflected light is less, in lens Picture afterwards is less, and photodiode also will be put on a corresponding position.Generally, the receiving area of photodiode has Limit, it is impossible to which guarantee can receive light nearby (within 10cm), can receive the light of (beyond 1m) at a distance again.This is resulted in In the market multiple models are separated to be suitable for the application of different distance, actually make with a series of electric transducer that diffuses There is problems with, the product blind area of detecting distance length is big, and the little product of check frequency is apart from short.So, visitor is caused Family selects inconvenience, and enterprise's production there is also inconvenience.

All there is check frequency in existing diffuse-reflectance formula photoelectric sensor, i.e., can not recognize the scope of target, for example：Work as sensing Device detecting distance is set as 10cm, and perfect condition is that all regions within 10cm may detect that object, but object is leaned on Cross into when, light reflex circuit is blocked by mirror holder, forms a check frequency, may less than the object in 3cm regions with regard to nothing Method is normally detected, of different sizes for the diffuse-reflectance formula photoelectric sensor check frequency of different size, but generally existing, sensing If device check frequency pays no heed in use, the omission of detection is likely to result in, the larger sensing of some check frequencies Device application scenario will much be limited, to using bringing very big inconvenience.

At present in the case where product type is not increased, the product for reducing diffuse-reflectance blind area is generally divided into two kinds：Transmitting connects Receive the variable transmitting of coaxial-type photoelectric sensor and lens position and receive separate type photoelectric sensor.Coaxial-type photoelectric sensor Need to consider impact of the internal spectroscope reflected light to receiving terminal in design, the requirement to assembling is higher.And lens position can The sensor of change inconvenient debugging during the use of user, to user puzzlement is brought, and also can be disappeared in enterprise production process More man-hours are consumed, production efficiency is affected.

Utility model content

The purpose of this utility model is to provide a kind of zero blind area diffuse-reflectance formula opto-electronic receiver lens based on TIR lens.

A kind of zero blind area diffuse-reflectance formula opto-electronic receiver lens based on TIR lens,

Bottom surface is installed including plane, installation bottom surface is provided with the groove for photodiode installation in the inner, and photoelectricity The receiving plane of diode is mutually perpendicular to optical axis,

The plane of the top surface of the lens forms the plane of incidence, and groove inner surface forms exit facet, and the outer wall of lens is formed instead Face is penetrated, wherein outer wall and groove inner surface at least one side is aspheric surface,

The larger light of angle of incidence to be incided and be refracted into lens interior after lens top surface, after outer wall reflection it is incident in place Receiving plane after groove；The less light of angle of incidence to be incided and be refracted into lens interior after lens top surface, through groove top Face converge to the receiving plane after groove, wherein,

Angular distribution meets：The light that 10 °～90 ° of angle of incidence is via lens outer wall reflecting focal to receiving plane, 0 ° of angle of incidence Inner surface of～70 ° of the light through groove top converges to receiving plane.

The refractive index of the material of the lens in the range of 1.2～4.0, the angle of the light that groove top convex surface is converged and outer The angle of the light of wall reflection overlaps, the illumination of angular distribution, the face type of reflecting surface and convergence face and receiving terminal hot spot Uniformity change is engaged.

The lens that this utility model is provided are used for the lens of off-axis diffuse-reflectance light collection, are installed in sensor and connect Receiving end, reflector draws near (move to 2cm from 1m) near sensor, and the illumination of photodiode receiving plane is ascending Even change.A long way off, the angle of incidence of the light of reflector reflection is less, and lens now exist light focusing equivalent to convex lenss On focal plane；On hand, the angle of incidence of the light of reflector reflection is larger, and lens exist light collection equivalent to a concave mirror Near focal point.Meanwhile, in the position by adjusting lens and receiving plane, can cause the illuminance that receiving plane is received with away from From changing more uniform.For diffuse-reflectance formula photoelectric sensor intelligent opto-electrical sensor, realize after setting detecting distance, The characteristic of blind area very little.When detection object whether there is, will not there is detection leakage phenomenon because object leans on too near.This programme can be with Substitute it is original different detecting distances from different sensors a difficult problem.For installation, select to be more prone to, operation is more Plus it is simple.Cause product stability high simultaneously, low production cost.

Description of the drawings

Fig. 1 is the dimensional structure diagram of the receiving lens of the electric transducer that diffuses of this utility model embodiment.

Fig. 2 is the top view of the lens in this utility model embodiment.

Fig. 3 is the rearview of the lens in this utility model embodiment.

Fig. 4 be Fig. 3 along A-A' lines cut open after profile；

Fig. 5 be Fig. 3 along B-B' lines cut open after profile；

Fig. 6 is illuminance change curve of the reflector in diverse location on corresponding receiving plane.

Wherein 1 --- TIR lens outer walls

2 --- the first mounting surface

3 --- the second mounting surface

4 --- the 3rd mounting surface

5 --- groove inner surface

7 --- the groove of TIR lens

8 --- lens base.

Specific embodiment

As shown in Figure 1-Figure 3, one kind that embodiment of the present utility model is provided is used for the electric transducer reception that diffuses The lens at end, lens include an installation bottom surface, install bottom surface and are provided with the groove 7 that positioning is installed for photodiode.Such as Fig. 3 Shown surface is the plane of incidence of lens, and the groove 7 and bottom surface 8 in Fig. 1 is emission parts, and the plane of incidence of this example is plane, is gone out Face is penetrated by aspheric surface, plane shared.1 is TIR lens outer walls, the reflecting surface as lens.2nd, 3 and 4 is fit structure Mounting surface.

As shown in figure 4, being perpendicular to bottom surface and through one of face of optical axis, with the plane as this along AA' lines section First plane of reference of embodiment, the inner surface 5 of described groove is axisymmetricly distributed in this face, and outer wall 1 and mounting surface 3 are in Mal-distribution, outer wall 1 is used as the reflective surface of receiving lens, and the lens thickness in the region is big compared with other region lens thicknesses. For the light that angle of incidence is 10 °～90 ° will reflect in outer wall 1, the portion of incident light that 0 °～70 ° of angle of incidence will be in inner surface 5 reflect, plane of refraction of the inner surface 5 as lens.

As shown in figure 5, being that the plane is simultaneously perpendicular to bottom surface and through another face of optical axis along the section of BB' lines Perpendicular to first plane of reference, with the surface as second plane of reference, mounting surface 2 and mounting surface 4 are symmetric.

In illuminance change curve as shown in Figure 6, after 3cm, illuminance is uniformly reducing with the increase of distance. In actual application, when the timing of luminous power one of transmitting, the illuminance of receiving plane can be completed by as far as closely progressively with this lens Increase, without any blind area after 3cm；If be set in sensing at blank 10cm, can see from illumination change curve：It is right Illumination identical point that should nearby is in 1cm or so, that is to say, that blind area size now is about 1cm, more remote accordingly The blind area of detection blank will be less.

Claims

1. a kind of zero blind area diffuse-reflectance formula opto-electronic receiver lens based on TIR lens, it is characterised in that

Bottom surface is installed including plane, installation bottom surface is provided with the groove for photodiode installation in the inner, and the pole of photoelectricity two The receiving plane of pipe is mutually perpendicular to optical axis,

The plane of the top surface of the lens forms the plane of incidence, and groove inner surface forms exit facet, and the outer wall of lens forms reflecting surface, Wherein outer wall and groove inner surface at least one side is aspheric surface,

The larger light of angle of incidence to be incided and be refracted into lens interior after lens top surface, is incided positioned at recessed after outer wall reflection Receiving plane after groove；The less light of angle of incidence to be incided and be refracted into lens interior after lens top surface, the face above groove The receiving plane after groove is converged to, wherein,

Angular distribution meets：The light that 10 °～90 ° of angle of incidence is via lens outer wall reflecting focal to receiving plane, 0 °～70 ° of angle of incidence Inner surface of the light through groove top converge to receiving plane.

2. zero blind area diffuse-reflectance formula opto-electronic receiver lens of TIR lens are based on as claimed in claim 1, it is characterised in that institute The refractive index of material of lens is stated in the range of 1.2～4.0, the light of the angle and outer wall reflection of the light that groove top convex surface is converged Angle overlap, angular distribution, reflecting surface and converge face face type and receiving terminal hot spot illumination uniformity change It is engaged.