EP3740807A1 - Mikromechanische lichtumlenkvorrichtung - Google Patents
Mikromechanische lichtumlenkvorrichtungInfo
- Publication number
- EP3740807A1 EP3740807A1 EP19701059.8A EP19701059A EP3740807A1 EP 3740807 A1 EP3740807 A1 EP 3740807A1 EP 19701059 A EP19701059 A EP 19701059A EP 3740807 A1 EP3740807 A1 EP 3740807A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- beam deflecting
- static
- micromechanical
- light
- deflecting element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000003068 static effect Effects 0.000 claims abstract description 36
- 238000007493 shaping process Methods 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 230000003667 anti-reflective effect Effects 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 239000006059 cover glass Substances 0.000 description 19
- 230000008901 benefit Effects 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 9
- 230000001629 suppression Effects 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004554 molding of glass Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/105—Scanning systems with one or more pivoting mirrors or galvano-mirrors
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
- G02B26/0833—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/108—Scanning systems having one or more prisms as scanning elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
Definitions
- the present invention relates to a micromechanical light deflection device.
- the present invention further relates to a method for deflecting light.
- the present invention is generally applicable to micromechanical light-redirecting devices, the present invention will be described with reference to micromechanical mirrors or synonymous MEMS mirrors in LiDAR systems.
- the present invention is generally applicable to electromagnetic waves of any wavelength, the present invention will be described in terms of visible light.
- Micromechanical light deflection devices are used, inter alia, in LiDAR systems. These use, for example, the light beam of a laser, which is deflected or deflected to irradiate a certain area. If this hits an object in the area, for example, a distance of the object to the LiDAR system can be determined on the basis of the backscattered light, more precisely the light transit time between the LiDAR system and the object.
- micromechanical mirror systems - MEMS mirror systems - can be used for this, which deflect or deflect a light beam accordingly.
- a MEMS mirror device is protected by a transparent cover and hermetically sealed, so that a movably arranged therein Micromechanical mirror is protected from environmental influences.
- the MEMS mirror device can be operated at negative pressure, which increases the achievable deflection angle for the MEMS mirror. It has become known to arrange the cover glass parallel or slightly oblique to the zero position of the MEMS mirror.
- the invention provides a micromechanical light redirecting device comprising a movable beam redirecting element configured to redirect an input light beam into an output light beam and a static beam redirecting device having a plurality of differently oriented surfaces disposed in the beam path of light for the beam redirecting beam Element is arranged so that the input beam for the movable beam deflecting element and / or the output light beam from the movable beam deflecting element passes through two of the differently oriented surfaces of the static beam deflecting device.
- the invention provides a method for deflecting light, wherein by means of a movable beam deflecting element, an input light beam is deflected into an output light beam, and a static beam deflecting device, which is provided with a plurality of differently oriented surfaces, so in the beam path of light for the movable beam deflecting element is arranged such that an input light beam for the movable beam deflecting element and / or an output light beam passes from the movable beam deflecting element through two of the differently oriented surfaces of the static beam deflecting device.
- One of the benefits of doing so is that there are static and non-static reflections, which are in particular caused by a cover, such as a cover glass avoided. Under static reflections here are those reflections referred to, which do not move with a movement of the movable beam deflecting element with this.
- Another advantage is that the micromechanical light deflection device is easy to manufacture and allows high tilt angles of a cover, allowing a large field of view.
- Another advantage is that multiple reflections are avoided.
- Another advantage is the almost complete suppression of static reflections, increased eye safety when using LiDAR systems. In addition, their higher power operation is possible, allowing for greater range of a LiDAR system based thereon. Another advantage is that dynamic reflections are at least partially suppressed, so that ghosting is suppressed, resulting in lower error rates and increased security. Likewise, a simple and cost-effective production, for example by means of construction and connection technology AVT possible. In addition, light can be coupled in a simple manner, so that a simple adjustment respectively larger manufacturing tolerances are possible.
- the static beam deflecting device has two optically separate regions.
- two optically separated regions By means of two optically separated regions, a subdivision of the static beam deflecting device is possible so that light paths between the regions are reliably separated or suppressed, thus avoiding reflections.
- the static beam deflecting device is formed as a cover for the movable beam deflecting element. This allows for easy production while reliable Protection of the movable beam deflecting element. In addition, a separate cover for the movable beam deflecting element can be omitted, which reduces the manufacturing cost.
- the static beam deflecting device is designed in the form of at least one prism.
- a prism which can be implemented in one or more parts, static and dynamic reflections can be almost completely suppressed. Due to the wedge angle of the at least one prism can no longer form parallel rays by multiple reflections. In other words, back and forth reflection of light between the plane-parallel faces of the at least one prism is suppressed.
- the static beam deflecting device in the form of a double prism, comprising two individual prisms, formed, wherein the two individual prisms are arranged symmetrically to each other.
- the static beam-deflecting device is arranged on an optically transparent cover for the movable beam-deflecting element.
- an optically transparent cover for the movable beam-deflecting element.
- the static beam deflecting device is fixed on the optically transparent cover by means of an adhesive, wherein the static beam deflecting element, adhesive and optically transparent cover have the substantially same refractive index for at least one wavelength range.
- the optically transparent cover is designed to be antireflective, in particular provided with an antireflection coating. This further reduces reflections.
- a beam-shaping element is arranged for the input light beam and / or output light beam, in particular on the static beam-deflecting device.
- a beam shaping optics for example with spherical, aspherical or arbitrarily shaped lenses, an additional optical component for beam shaping of the input and / or output light beam can be avoided, which enables lower production costs.
- the movable beam-deflecting element is designed in the form of a micromirror.
- a micromirror By means of a micromirror, a light beam can be deflected in a simple and reliable way.
- Figure 1 shows in schematic form a micromechanical light deflection device in cross-section according to an embodiment of the present invention.
- the micromechanical mirror 5, in short micromirror, is rotatable about an axis perpendicular to the plane of the drawing and about an axis parallel to the drawing plane of FIG. 1 at an angle, as indicated by the dashed lines, and can thus be an incident light beam 2 from a light source 1, for example a laser, a light emitting diode, etc. deflect.
- a light source 1 for example a laser, a light emitting diode, etc. deflect.
- the input light beam 2 impinges on the micromirror 5 via a first prism 3 and a cover glass 4.
- the input light beam 2 is reflected by the micromirror 5, deflected by a specific angle and passes as an output light beam 2 'over the cover glass 4 and a second Prism 6 in an object space.
- the sides 31, 61, so the Ankatheten are arranged parallel to the plane of the cover glass 4 on the cover glass 4, in particular by means of an optical bonding method, for example a UV adhesive, an epoxy resin, etc. cemented to the cover glass 4.
- the prisms 3, 6 can be made by injection molding of plastic or molding of glasses, which allows low cost with complex designs.
- the cover glass 4 in Figure 1 can also be omitted.
- the two prisms 3, 6 even without cover glass 4 applied directly to a housing of the micromirror 5, in particular glued, and assume its function with.
- the wedge angle 1 1 of the prisms 3, 6 and / or the material of the prisms 3, 6 can be adjusted with respect to the refractive index in order to save material and / or costs and to simplify the production. In general, for example, wedge angle 1 1 between 0 ° and 75 °, in particular between 10 ° and 50 °, possible.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018200672.5A DE102018200672A1 (de) | 2018-01-17 | 2018-01-17 | Mikromechanische Lichtumlenkvorrichtung |
PCT/EP2019/050878 WO2019141655A1 (de) | 2018-01-17 | 2019-01-15 | Mikromechanische lichtumlenkvorrichtung |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3740807A1 true EP3740807A1 (de) | 2020-11-25 |
Family
ID=65041737
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19701059.8A Withdrawn EP3740807A1 (de) | 2018-01-17 | 2019-01-15 | Mikromechanische lichtumlenkvorrichtung |
Country Status (5)
Country | Link |
---|---|
US (1) | US12092811B2 (de) |
EP (1) | EP3740807A1 (de) |
CN (1) | CN111615659B (de) |
DE (1) | DE102018200672A1 (de) |
WO (1) | WO2019141655A1 (de) |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6961194B2 (en) * | 2001-12-31 | 2005-11-01 | Texas Instruments Incorporated | Integrated TIR prism and lens element |
US7274500B2 (en) * | 2003-12-03 | 2007-09-25 | Eastman Kodak Company | Display system incorporating trilinear electromechanical grating device |
JP5070869B2 (ja) * | 2007-02-09 | 2012-11-14 | ブラザー工業株式会社 | 光走査装置及びそれを備えた網膜走査型画像表示装置 |
US8210689B2 (en) * | 2007-12-31 | 2012-07-03 | 3M Innovative Properties Company | Projection system |
US8864316B2 (en) * | 2010-04-28 | 2014-10-21 | Lemoptix Sa | Optical MEMS scanning micro-mirror with speckle reduction |
WO2011134516A1 (en) | 2010-04-28 | 2011-11-03 | Lemoptix Sa | Optical mems scanning micro-mirror with anti-speckle cover |
JP2013041236A (ja) * | 2011-07-01 | 2013-02-28 | Hitachi Media Electoronics Co Ltd | 走査型画像表示装置及び走査型投影装置 |
TWI498598B (zh) * | 2013-11-12 | 2015-09-01 | Delta Electronics Inc | 立體裸視投影裝置及顯示裝置 |
JP6439802B2 (ja) * | 2014-12-08 | 2018-12-19 | 株式会社リコー | 光偏向器、画像表示装置及び物体装置 |
CN105824118B (zh) * | 2015-01-07 | 2019-04-16 | 先进微系统科技股份有限公司 | 激光投射装置 |
DE102017202018B4 (de) * | 2017-02-09 | 2021-03-11 | Robert Bosch Gmbh | Scannersystem mit einer Strahlquelle, einem Spiegel und einem prismatischen Element |
-
2018
- 2018-01-17 DE DE102018200672.5A patent/DE102018200672A1/de active Pending
-
2019
- 2019-01-15 CN CN201980009075.7A patent/CN111615659B/zh active Active
- 2019-01-15 EP EP19701059.8A patent/EP3740807A1/de not_active Withdrawn
- 2019-01-15 WO PCT/EP2019/050878 patent/WO2019141655A1/de unknown
- 2019-01-15 US US16/961,249 patent/US12092811B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
CN111615659A (zh) | 2020-09-01 |
CN111615659B (zh) | 2022-08-12 |
WO2019141655A1 (de) | 2019-07-25 |
US12092811B2 (en) | 2024-09-17 |
US20210063726A1 (en) | 2021-03-04 |
DE102018200672A1 (de) | 2019-07-18 |
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