CN209068222U - A kind of planar coaxial light source - Google Patents
A kind of planar coaxial light source Download PDFInfo
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- CN209068222U CN209068222U CN201822052731.7U CN201822052731U CN209068222U CN 209068222 U CN209068222 U CN 209068222U CN 201822052731 U CN201822052731 U CN 201822052731U CN 209068222 U CN209068222 U CN 209068222U
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- light source
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- 230000003287 optical effect Effects 0.000 claims abstract description 20
- 238000002310 reflectometry Methods 0.000 claims abstract description 12
- 238000002834 transmittance Methods 0.000 claims abstract description 11
- 241000826860 Trapezium Species 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 5
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 9
- 238000005286 illumination Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
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Abstract
A kind of planar coaxial light source, the parallel optical assembly including the light splitting group being made of N number of light splitting surface disposed in parallel and positioned at light splitting group side, the parallel optical assembly are used for the light splitting group emitting parallel light；Incidence angle of the directional light on light splitting surface is 45 degree, light splitting surface perpendicular to the height in directional light incident direction with two neighboring reflective surface being equidistant in directional light incident direction, the light splitting surface is equal with the beam heights H of directional light perpendicular to the height in directional light incident direction, length L of the beam heights H and determinand of directional light in directional light incident direction meets the relationship of N*H >=L, N >=2；It along directional light incident direction serial number is N-1 by N number of light splitting surface, the reflectivity Rn and transmittance Tn of n-th of light splitting surface meet following condition: Rn=R(n‑1)*T(n‑1),Tn=1-Rn,R1=0.5, T1=0.5.The utility model can effectively reduce the height of planar coaxial light source, reduces the volume of light source entirety, facilitates improving measurement accuracy.
Description
Technical field
The utility model relates to vision-based detection and radiographic measurement technical field, especially vision-based detections and image measurer to use
A kind of planar coaxial light source.
Background technique
In vision-based detection and radiographic measurement technical field, coaxial optical illumination is a kind of important lighting method, using same
Axis optical illumination can provide the illumination light of light shaft coaxle highly uniform and with image collecting device.Existing coaxial-illuminating light source
Typical light paths as shown in Figure 1, collimated collimated light beam is incident to semi-transparent semi-reflecting lens with 45° angle, turn back after 90 ° by a part of light
Vertical irradiation arrives again at semi-transparent semi-reflecting lens to object under test, by the light for carrying body surface information that object under test reflects,
A part therein is transmitted into the camera lens or detector of top, completes the measurement to body surface.
The major defect of the optical path is: it must satisfy H >=L between the height H of collimated light beam and the size L of determinand, this
Lead to two main problems: 1. when determinand size L is larger, and the height H that will lead to collimated light beam is excessively high, makes coaxial light source height
Degree and detection system overall volume are excessive；2. camera lens and object under test distance can be drawn high when coaxial light source is bulky, visiting
Survey the limited situation of lens focus under, will lead to object can not on test surface blur-free imaging, to influence measurement accuracy.
Utility model content
The utility model provides a kind of planar coaxial light source, and the height of planar coaxial light source is effectively reduced, and it is whole to reduce light source
The volume of body, facilitates improving measurement accuracy.
The utility model provides a kind of planar coaxial light source, including the light splitting group being made of N number of light splitting surface disposed in parallel
And the parallel optical assembly positioned at light splitting group side, the parallel optical assembly are used for the light splitting group emitting parallel light；It is described
Incidence angle of the directional light on light splitting surface be 45 degree, light splitting surface perpendicular in directional light incident direction height with it is two neighboring
Reflective surface being equidistant in directional light incident direction, the light splitting surface perpendicular in directional light incident direction height with
The beam heights H of directional light is equal, and length L of the beam heights H and determinand of directional light in directional light incident direction meets
The relationship of N*H >=L, N >=2；It along directional light incident direction serial number is N-1 by N number of light splitting surface, n-th light splitting surface
Reflectivity R(n)With transmittance T(n)Meet following condition: Rn=R(n-1)*T(n-1),Tn=1-Rn,R1=0.5, T1=0.5.
Preferably, the parallel optical assembly includes light source and collimation mechanism, and the light that light source issues passes through the collimation mechanism
Light splitting group described in directive after collimation.
Preferably, the collimation mechanism includes with directional light incident direction bottom plate disposed in parallel and above bottom plate
Reflecting surface, the reflecting surface is in off axis paraboloid mirror shape, and the light source is fixed on the bottom plate and is located at the focus of reflecting surface
On.
Preferably, the collimation mechanism includes and directional light incident direction bottom plate disposed in parallel and is located on bottom plate
Reflecting surface, the reflecting surface has the first off axis paraboloid mirror being located above bottom plate and second off-axis throwing below bottom plate
Object plane, the upper surface of the bottom plate is fixed with first light source and first light source is located in the focus of the first off axis paraboloid mirror, described
The lower surface of bottom plate is fixed with second light source and second light source is located in the focus of the second off axis paraboloid mirror.
It preferably, further include by a parallelogram prism being sequentially arranged of N-1 and being located at positioned at N-1 sequentially
The prism group that the right-angled trapezium prism at the parallelogram prism both ends of arrangement is formed, the inclined-plane and phase of the right-angled trapezium prism
It is glued between the inclined-plane of adjacent parallelogram prism and between the inclined-plane of two neighboring parallelogram prism, to be formed
The light splitting surface；Shell is fixed on the outside of one of right-angled trapezium prism, the parallel optical assembly is arranged inside the shell, and
The directional light of parallel optical assembly transmitting injects prism group from the plane of the chlamydate right-angled trapezium prism of fixation.
Preferably, the parallelogram prism is identical with the material of right-angled trapezium prism.
Preferably, the outer surface of the prism group is coated with anti-reflection film.
Preferably, the shell is fixed on the outside of prism group and is arranged around the prism group.
Preferably, radiator structure is additionally provided on the shell.
Preferably, the radiator structure is multiple heat sinks that case surface is arranged in.
In the utility model, a part of directional light is by light splitting surface dichroic reflection to object under test surface, another part
Then passing through light splitting, a light splitting surface irradiates downwards, since the reflectivity and transmittance of light splitting surface change according to predetermined rule, so that
The light reflected from light splitting surface is kept uniformly, to provide uniform axis light.Due to the beam heights H and determinand of directional light
Length L in directional light incident direction meets the condition of N*H >=L, without by lens system and beam heights be set as with to
The equal sized of object is surveyed, the height of planar coaxial light source can be greatly reduced, reduce integrally-built volume.Since plane is same
The height of axis light source reduces, and in measurement process, the distance between camera lens and object under test can shorten, and expand lens focus
Adjustable range, can be with service hoisting detection accuracy.
Meanwhile final light-source system efficiency is N*RN*TN, when N be greater than 1 when, compared to tradition 25% source efficiency,
The system effectiveness of the application is higher than existing coaxial light source efficiency, plays the role of improving light-source system efficiency.
Detailed description of the invention
Fig. 1 is a kind of light path schematic diagram of planar coaxial light source of the prior art；
Fig. 2 is a kind of structural schematic diagram of the planar coaxial light source of embodiment of the utility model；
Fig. 3 is the structural schematic diagram of the planar coaxial light source of the utility model another kind embodiment；
Fig. 4 is a kind of structural schematic diagram of the parallelogram prism of embodiment of the utility model；
Fig. 5 is a kind of structural schematic diagram of the right-angled trapezium prism of embodiment of the utility model；
Fig. 6 is a kind of structural schematic diagram of the planar coaxial light source of embodiment of the utility model；
Fig. 7 is a kind of partial enlargement diagram of the collimation mechanism of embodiment of the utility model；
Fig. 8 is a kind of structural schematic diagram of the collimation mechanism of embodiment of the utility model；
Fig. 9 is a kind of partial enlargement diagram of the collimation mechanism of embodiment of the utility model.
Specific embodiment
The application it is so-called " equal " or " identical " refer to it is equal or identical in view of reasonable error, and
It is equal or identical in non-absolute sense.Reflectivity and transmittance determined by the application are to consider light in the medium
In the presence of being centainly lost and there are made in the case of reasonable error.Below by specific embodiment combination attached drawing to this reality
It is described in further detail with novel.
The utility model embodiment provides a kind of planar coaxial light source, as shown in Fig. 2, including by N number of disposed in parallel point
The light splitting group that smooth surface 10 forms and the parallel optical assembly 20 positioned at light splitting group side, N >=2 here, and natural should be whole
Number.The parallel optical assembly 20 is used for the light splitting group emitting parallel light.Since Fig. 2 is sectional view, section shape is illustrated only
Shape, directional light are not single linear light source, extend in the direction of vertical paper, are in planar light beam, and the section of light beam can be with
In rectangle.Similarly, light splitting surface 10 also extends in the direction of vertical paper, can be in rectangle.Light splitting surface 10 has spectrophotometric result,
A part of light can be reflected or transmit a part of light.
Incidence angle of the directional light on light splitting surface 10 is 45 degree, and transmitting light through reflection is vertical with directional light, with same
Axis exposes to the surface of object under test.Light splitting surface 10 perpendicular in directional light incident direction height and two neighboring reflective surface
10 being equidistant in directional light incident direction, since incidence angle is 45 degree, it is understood that be light splitting surface 10 in figure
Length is twice of spacing between another light splitting surface adjacent thereto.Meanwhile the light splitting surface 10 enters perpendicular to directional light
The height penetrated on direction is equal with the beam heights H of directional light, in this way, between the vertical projection of two neighboring light splitting surface 10 is not present
Gap, reflected light will not be in the separated of two light splitting surfaces, to form continuous face reflected light.
Wherein, length L of the beam heights H and determinand of directional light in directional light incident direction meets the pass of N*H >=L
System guarantees the range of reflected light covering object under test length direction.Since the surface of object under test is planar structure, it should will divide
Length and directional light length in vertical paper direction of the smooth surface 10 in vertical paper direction is set as the width with determinand
Width equal or greater than determinand, to guarantee that illumination can just cover the upper surface of object to be detected, for camera lens or spy
Device is surveyed to be detected.Since directional light sequentially passes through each light splitting surface 10, a part of light passes through after the reflection of light splitting surface 10
Light is attenuated, it should be changed the reflectivity of light splitting surface 10 and transmittance according to predetermined rule, be kept each light splitting surface 10 anti-
The illumination for the light penetrated keeps unified, to realize Uniform Illumination.
In the present embodiment, by N number of light splitting surface along directional light incident direction serial number be N-1 it is as shown in Figure 2, position
The number of light splitting surface 10 in the leftmost side is 1, and the light splitting surface number of the rightmost side is N.The reflectivity R of n-th of light splitting surface(n)And transmission
Compare T(n)Meet following condition: Rn=R(n-1)*T(n-1),Tn=1-Rn,R1=0.5, T1=0.5.In this way, each light splitting surface 10 reflects
The illumination amplitude of light afterwards keeps unified, to provide uniform coaxial-illuminating light.
Wherein, the parallel optical assembly 20 may include light source and collimation mechanism, and collimation mechanism can use the prior art
Colimated light system, light source issue light by the collimation mechanism collimation after, the directional light of pencil is translated into, to penetrate in parallel
To the light splitting group.
Light splitting surface 10 can be the beam splitting lens of very thin thickness, and beam splitting lens meets above-mentioned positions and dimensions requirement,
Reflectivity and transmittance also meet above-mentioned requirements.Beam splitting lens can be elongated, and both ends can be fixed by fixed plate.When
So, light splitting surface 10 is also possible to the reflecting surface of prism, is spliced by muti-piece prism.
The utility model embodiment also provides a kind of planar coaxial light source, on the basis of the above embodiments, the present embodiment
The specific composition of light splitting surface 10 is illustrated, as shown in figure 3, planar coaxial light source further include be sequentially arranged by N-1 it is flat
Row quadrant prism 11 and the right-angled trapezium rib for being located at 11 both ends of parallelogram prism being sequentially arranged positioned at N-1
The prism group that mirror 12 is formed.As shown in figure 4, being the cross sectional shape of parallelogram prism 11, parallelogram prism 11 is in length
Bar shaped, for tool there are two inclined-plane and two planes, the angle of two inclined-planes and upper and lower two planes is respectively 45 degree and 135 degree, and two
Spacing H2 between a plane is equal with the width L2 of plane.As shown in figure 5, being the cross sectional shape of right-angled trapezium prism 12, directly
Angle Dove prism 12 is also elongated, and for tool there are three plane and an inclined-plane, internal angle is 45 degree of angles, one 135
Angle and two right angles are spent, inclined-plane and upper and lower two planes are in 135 degree of angles and 45 degree of angles respectively, and H1 is equal with L1 in figure.It is all flat
For row quadrant prism 11 according to same towards arrangement, the upper plane of all parallelogram prisms 11 is in same plane, puts down
The inclined-plane of row quadrant prism 11 is glued each other, forms a part of light splitting surface 10, the inclined-plane and phase of the right-angled trapezium prism 12
The inclined-plane of adjacent parallelogram prism 11 is also glued together, also forms light splitting surface 10.Right-angled trapezium prism 12 and parallel four
Length of the side shape prism 11 along vertical paper direction can be equal, and prism group is made to form a cuboid.Wherein one it is straight
The outside of angle Dove prism 12 is fixed with shell 21, and the parallel optical assembly 20 is arranged in shell 21, and as shown in the figure, puts down
The directional light that row optical assembly 20 emits injects prism group from the plane of the right-angled trapezium prism 12.The present embodiment is by planar coaxial light
Source is made into a complete independent device, can be directly installed in vision-based detection and radiographic measurement equipment, convenient for directly using.
In order to guarantee that light can the relatively uniform transmission in prism group, the parallelogram prism 11 and right angle ladder
The material of shape prism 12 can be identical, to have in the overstepping one's bounds smooth surface position of parallelogram prism 11 and right-angled trapezium prism 12
There are identical reflectivity and transmittance.
Different reflectivity and transmittance possessed by each light splitting surface 10, can be by plating corresponding reflection in light splitting surface 10
Film and transmission film realize that the reflectivity of reflectance coating and the transmittance of transmission film are according to reflectivity required for each light splitting surface 10
It is configured with transmittance.And it is coated with anti-reflection film in the outer surface of the prism group, enhance the transmissivity of light, reduces the radiation of light
Loss.
As shown in fig. 6, shell 21 is equipped with groove 22, prism group is inserted into groove 22 and is fixed in groove 22.Shell
21 can be only secured to 12 outside of right-angled trapezium prism of side, can also be fixed on the outside of prism group and around the prism
Group setting, forms a square ring structure, and the groove 22 of annular, the periphery of prism group are equipped on the inner wall of the cyclic structure
It is inserted into groove 22, to be fixedly linked with shell 21.
It is additionally provided with radiator structure 23 on the shell 21, more heat transfer can be generated since parallel optical assembly 20 shines, dissipated
Heat structure 23 is used for auxiliary heat dissipation, specifically can be the structures such as heat sink, and for the ease of heat dissipation, shell 21 can be by heat conduction material
Material is made, and is conducted heat to except shell 21 with auxiliary.
On the basis of the above embodiments, two kinds of embodiments will be provided herein come collimation mechanism and be illustrated:
In one embodiment, as shown in Figure 6 and Figure 7, shell 21 is equipped with groove 22, and groove 22 is opened towards prism group
Mouthful.The collimation mechanism includes and reflecting surface directional light incident direction bottom plate 24 disposed in parallel and be located on bottom plate
25, bottom plate 24 is fixed on the inner wall of groove 22, and reflecting surface 25 is made of the inner wall of groove 22.The reflecting surface 25, which has, to be located at
The first off axis paraboloid mirror 251 and the second off axis paraboloid mirror 252 below bottom plate 24 of 24 top of bottom plate, in the bottom plate 24
Upper surface be fixed with first light source 201 and first light source 201 is located in the focus of the first off axis paraboloid mirror 251, the bottom plate
24 lower surface is fixed with second light source 202 and second light source 202 is located in the focus of the second off axis paraboloid mirror 252.First light
The light that source 201 and second light source 202 issue after two off axis paraboloid mirrors reflect, projects outward in directional light respectively.First
Light source 201 and second light source 202 may each be light bar, extend along the direction perpendicular to paper, light is dissipated to off axis paraboloid mirror
It penetrates.Smaller size can be arranged in the thickness of bottom plate 24, to reduce influence of the bottom plate 24 to light.
In one embodiment, as shown in Figure 8 and Figure 9, shell 21 is equipped with groove 22, and groove 22 is opened towards prism group
Mouthful.The collimation mechanism includes and directional light incident direction bottom plate 24 disposed in parallel and the reflecting surface above bottom plate
25, the reflecting surface is in off axis paraboloid mirror shape, and reflecting surface 25 is made of the inner wall of groove 22.The upper surface of bottom plate 24 and prism
The lower surface of group flushes, and the light source 200 is fixed on the bottom plate 24 and is located in the focus of reflecting surface 25.Light source 200 is sent out
Light out projects outward after off axis paraboloid mirror reflects, in directional light.Light source 200 can be light bar, along perpendicular to paper
Direction extends, and light is scattered to off axis paraboloid mirror.For the ease of heat dissipation, the outer surface of bottom plate 24 is equipped with multiple disposed in parallel
Heat sink.
The above content is combine specific embodiment further detailed description of the utility model, and it cannot be said that
The specific implementation of the utility model is only limited to these instructions.For the utility model person of an ordinary skill in the technical field
For, without departing from the concept of the premise utility, a number of simple deductions or replacements can also be made.
Claims (10)
1. a kind of planar coaxial light source, it is characterised in that:
Parallel optical assembly including the light splitting group being made of N number of light splitting surface disposed in parallel and positioned at light splitting group side, it is described
Parallel optical assembly is used for the light splitting group emitting parallel light；Incidence angle of the directional light on light splitting surface is 45 degree, light splitting
Face perpendicular to the height in directional light incident direction with two neighboring reflective surface being equidistant in directional light incident direction,
The light splitting surface is in, the light beam of directional light equal with the beam heights H of directional light perpendicular to the height in directional light incident direction
The length L of height H and determinand in directional light incident direction meets the relationship of N*H >=L, N >=2；By N number of light splitting surface edge
Directional light incident direction serial number is N-1, the reflectivity R of n-th of light splitting surface(n)With transmittance T(n)Meet following condition: Rn
=R(n-1)*T(n-1),Tn=1-Rn,R1=0.5, T1=0.5.
2. planar coaxial light source according to claim 1, it is characterised in that:
The parallel optical assembly includes light source and collimation mechanism, the light that light source issues directive institute after collimation mechanism collimation
State light splitting group.
3. planar coaxial light source according to claim 2, it is characterised in that:
The collimation mechanism includes and directional light incident direction bottom plate disposed in parallel and the reflecting surface above bottom plate, institute
Reflecting surface is stated in off axis paraboloid mirror shape, the light source is fixed on the bottom plate and is located in the focus of reflecting surface.
4. planar coaxial light source according to claim 2, it is characterised in that:
The collimation mechanism includes and reflecting surface directional light incident direction bottom plate disposed in parallel and be located on bottom plate, institute
Stating reflecting surface has the first off axis paraboloid mirror being located above bottom plate and the second off axis paraboloid mirror below bottom plate, the bottom
The upper surface of plate is fixed with first light source and first light source is located in the focus of the first off axis paraboloid mirror, the lower surface of the bottom plate
It is fixed with second light source and second light source is located in the focus of the second off axis paraboloid mirror.
5. planar coaxial light source according to claim 1-4, it is characterised in that:
Further include the parallelogram prism being sequentially arranged by N-1 and being located at be sequentially arranged positioned at N-1 it is parallel
The prism group that the right-angled trapezium prism at quadrant prism both ends is formed, the inclined-plane of the right-angled trapezium prism and adjacent parallel four
It is glued between the inclined-plane of side shape prism and between the inclined-plane of two neighboring parallelogram prism, to form the light splitting
Face；Shell is fixed on the outside of one of right-angled trapezium prism, the parallel optical assembly is arranged inside the shell, and directional light group
The directional light of part transmitting injects prism group from the plane of the chlamydate right-angled trapezium prism of fixation.
6. planar coaxial light source according to claim 5, it is characterised in that:
The parallelogram prism is identical with the material of right-angled trapezium prism.
7. planar coaxial light source according to claim 5, it is characterised in that:
The outer surface of the prism group is coated with anti-reflection film.
8. planar coaxial light source according to claim 5, it is characterised in that:
The shell is fixed on the outside of prism group and is arranged around the prism group.
9. planar coaxial light source according to claim 5, it is characterised in that:
Radiator structure is additionally provided on the shell.
10. planar coaxial light source according to claim 9, it is characterised in that:
The radiator structure is multiple heat sinks that case surface is arranged in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822052731.7U CN209068222U (en) | 2018-12-07 | 2018-12-07 | A kind of planar coaxial light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822052731.7U CN209068222U (en) | 2018-12-07 | 2018-12-07 | A kind of planar coaxial light source |
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| Publication Number | Publication Date |
|---|---|
| CN209068222U true CN209068222U (en) | 2019-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822052731.7U Withdrawn - After Issue CN209068222U (en) | 2018-12-07 | 2018-12-07 | A kind of planar coaxial light source |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109555998A (en) * | 2018-12-07 | 2019-04-02 | 珠海博明视觉科技有限公司 | A kind of planar coaxial light source |
-
2018
- 2018-12-07 CN CN201822052731.7U patent/CN209068222U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109555998A (en) * | 2018-12-07 | 2019-04-02 | 珠海博明视觉科技有限公司 | A kind of planar coaxial light source |
| CN109555998B (en) * | 2018-12-07 | 2024-02-13 | 珠海博明视觉科技有限公司 | Plane coaxial light source |
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