EP4327141A1 - Spiegel für ein head-up-display - Google Patents
Spiegel für ein head-up-displayInfo
- Publication number
- EP4327141A1 EP4327141A1 EP22718062.7A EP22718062A EP4327141A1 EP 4327141 A1 EP4327141 A1 EP 4327141A1 EP 22718062 A EP22718062 A EP 22718062A EP 4327141 A1 EP4327141 A1 EP 4327141A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mirror
- web
- base body
- display
- head
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/561—Injection-compression moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00596—Mirrors
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0149—Head-up displays characterised by mechanical features
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
- G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
- B29L2011/0058—Mirrors
Definitions
- the present invention relates to a mirror for a head-up display, in particular for a head-up display for a means of transportation.
- the invention also relates to a head-up display that has such a mirror.
- a head-up display also referred to as a HUD, is understood to mean a display system in which the viewer can maintain his line of sight, since the content to be displayed is displayed in his field of vision. While such systems were originally used mainly in the aviation sector due to their complexity and costs, they are now also being installed in large series in the automotive sector.
- Head-up displays generally consist of an imaging unit or PGU (Picture Generating Unit), an optical unit and a mirror unit.
- the imaging unit generates the image and uses at least one display element for this purpose.
- the optics unit directs the image to the mirror unit.
- the mirror unit is a partially reflective, translucent disc. The viewer thus sees the content displayed by the imaging unit as a virtual image and at the same time the real world behind the pane. In the automotive sector, the windshield is often used as a mirror unit, and its curved shape must be taken into account in the display. Due to the interaction of the optics unit and the mirror unit, the virtual image is an enlarged representation of the image generated by the imaging unit.
- the optics unit usually includes several mirrors in order to keep the space required as small as possible.
- the light emanating from the imaging unit is reflected by a folding mirror onto a curved mirror, which then reflects it towards the windshield.
- the curved mirrors currently used are designed as essentially flat plates with a large curvature corresponding to the desired optical function. the Such curved mirrors are produced, for example, by means of injection molding or injection compression molding.
- DE 10 2010 043 947 A1 describes a method for producing a mirror, in which at least one base body is coated with at least one light-reflecting coating material.
- the coating material is applied to a surface of an injection mold and then the base body is applied to the coating material.
- the base body is formed from an injectable material that is injected into a cavity of the injection mold.
- WO 2016/189361 A1 describes a mirror for a head-up display.
- the mirror is an injection molded molded part having a back and a front. Pivot bearings and mounts for a motor or spring are integrated into the back.
- the front has a mirror coating.
- the flexural rigidity of the components manufactured in this way is low.
- the lack of flexural rigidity is therefore compensated for by the material thickness. This leads to extended cycle times and high material costs.
- the components are filled via a wide sprue, which then has to be milled off. This requires an additional work step.
- a mirror for a head-up display has a base body with a flat area and an edge of the flat area arranged web.
- a mirror layer is arranged on the flat area.
- the mirror is not designed as an essentially flat plate, as in the prior art, but has a web at least partially on its edge.
- a ridge can be formed on each of the long sides. This structure results in increased flexural rigidity, making the mirror significantly less sensitive to mechanical influences. This allows the material thickness and thus the material costs and the required cycle time to be reduced.
- the web is designed as a circumferential web.
- the mirror is designed like a trough or a trough, as a result of which particularly high flexural rigidity is achieved.
- the ridge is inclined relative to a mirror axis of the mirror.
- the mirror axis designates the normal to the mirror layer in the center of the mirror layer. This makes it possible to introduce microstructures into the web that reach down to the lower edge of the mirror layer.
- the inclination of the web relative to the mirror axis can be of the order of 15°, for example.
- the web has an anti-reflection structure.
- an anti-reflection structure There is a risk of light reflection on the side surfaces of the mirror. This can be avoided by an anti-reflection structure.
- a microstructure for example, can be introduced into the web as an antireflection structure.
- the antireflection structure is manufactured by means of laser structuring or sandblasting. If the ridge is sufficiently inclined relative to the mirror axis, it is possible to introduce a microstructure into the ridge by means of laser structuring, which microstructure extends to the lower edge of the mirror layer. Alternatively, by means of sandblasting or similar technologies, a microstructure can be introduced into the web, which has a smaller depth. In this case, the angle of the ridge relative to the mirror axis can be reduced.
- the mirror layer is formed by a coating applied to the base body or by a mirror element placed on the base body.
- Applying a coating to the base body has the advantage that no separate mirror element has to be produced and handled.
- the placement of a mirror element has the advantage that the requirements for the surface quality of the base body are reduced.
- the mirror layer is preferably arranged on that side of the base body which is remote from the web. This simplifies the manufacture of the mirror layer. In principle, however, it can also be arranged on the side of the base body facing the web.
- a thickness of the planar area or the web is less than 3.5 mm. By reducing the thickness to this value, a reduction in material thickness of around 30% compared to conventional mirrors is achieved. Optimum values can be determined, for example, by simulations using finite elements.
- the base body is manufactured by means of injection molding or injection compression molding with hot runner strip gating.
- the use of a strip gate in connection with hot runner technology has the advantage that the base body does not have to be separated by milling after injection molding or injection compression molding. As a result, there is no chip formation and there is no risk of stress cracks. Overall, this approach results in fewer rejects during production.
- the material thickness can be adjusted by varying the embossing die. If the mirror layer is arranged on the side of the base body facing away from the web, the embossing stamp can be produced inexpensively, since it does not require the precision or polish of the mirror on its surface.
- an embossing core used in injection molding has a geometry in the area of a transition between the flat area and the web that is designed to compensate for a shape deviation due to volume shrinkage when the base body cools down. Due to the larger amount of material at the transition from the web to the flat area and the associated corresponding volumetric shrinkage during cooling, there is a risk of a small deviation in shape in this area. This shape deviation can be reduced or prevented entirely by counteracting adjustment of the geometry of the embossing die.
- the necessary pre-deformation of the embossing stamp can be determined, for example, by simulations or tests.
- a mirror according to the invention is preferably used in a flat display for a means of transport, e.g. in a flat display for a motor vehicle. Due to its structure, the mirror according to the invention is relatively insensitive to mechanical influences, such as vibrations or impacts from potholes, etc. Accordingly, a flat-up display with a mirror according to the invention is preferably used in a means of transportation.
- FIG. 1 schematically shows a prior art Flead-Up Display for a motor vehicle
- Fig. 2 shows schematically a mirror according to the prior art for a flat-up display
- 3 schematically shows a mirror according to the invention for a head-up display
- Fig. 4 illustrates the release position of a mirror according to the invention by means of injection-compression molding
- FIG. 6 schematically shows an antireflection structure introduced into a web of the mirror.
- the flat-up display has a display device 1 with an imaging unit 10 and an optical unit 12 .
- a beam of rays SB1 emanates from a display element 11 and is reflected by a folding mirror 21 onto a curved mirror 22 which reflects it in the direction of a mirror unit 2 .
- the mirror unit 2 is shown here as a windshield 20 of the motor vehicle. From there, the bundle of rays SB2 arrives in the direction of an eye of an observer 3. The viewer 3 sees a virtual image VB, which is located outside the motor vehicle above the hood or even in front of the motor vehicle.
- the virtual image VB is an enlarged representation of the image displayed by the display element 11 due to the interaction of the optics unit 12 and the mirror unit 2 .
- a speed limit, the current vehicle speed and navigation instructions are shown here symbolically.
- the eye of the viewer 3 is within an eye box 4 indicated by a rectangle, all elements of the virtual image VB are visible to the viewer 3 . If the eye of the viewer 3 is outside of the eye box 4, then the virtual image VB is only partially visible to the viewer 3 or not at all. The larger the Eyebox 4 is, the less restricted the viewer is when choosing his seating position.
- the curvature of the curved mirror 22 matches the curvature of the windshield 20 and ensures that the image distortion is stable across the entire eyebox 4.
- the curved mirror 22 is rotatably supported by a bearing 23 .
- the rotation of the curved mirror 22 made possible by this enables the eyebox 4 to be moved and thus the position of the eyebox 4 to be adjusted to the position of the viewer 3.
- the folding mirror 21 serves to ensure that the path covered by the beam of rays SB1 between the display element 11 and the curved mirror 22 is long, and at the same time the optics unit 12 is still compact.
- the imaging unit 10 and the optics unit 12 are separated from the surroundings by a housing 13 with a transparent cover plate 24 .
- the optical elements of the optical unit 12 are thus protected, for example, against dust located in the interior of the vehicle.
- An optical film or a polarizer 25 can also be located on the cover plate 24 .
- the display element 11 is typically polarized and the mirror unit 2 acts as an analyzer.
- the purpose of the polarizer 25 is therefore to influence the polarization in order to achieve uniform visibility of the useful light.
- a covering arrangement 26 arranged on the covering pane 24 serves to reliably absorb the light reflected via the boundary surface of the covering pane 24, so that the viewer is not dazzled. Besides the Sunlight SL can do that too Light from another stray light source 5 reach the display element 11 .
- the polarizer 25 can also be used to reduce incident sunlight SL.
- FIG. 2 schematically shows a mirror 22 according to the prior art for a head-up display.
- 2a) shows a side view
- FIG. 2b) shows a plan view.
- the mirror 22 has a base body 220 which only comprises a flat area 221 .
- a mirror layer 224 is arranged on the planar area 221 .
- the mirror 22 is thus designed as a substantially flat plate with a large curvature corresponding to the desired optical function.
- the mirror 22 can be made by injection molding or injection compression molding of a transparent thermoplastic such as COC (cyclo-olefin copolymer).
- COC cyclo-olefin copolymer
- FIG. 3 schematically shows a mirror 22 according to the invention for a head-up display.
- 3a) again shows a side view and
- FIG. 3b) shows a plan view.
- the mirror 23 has a base body 220 which has a web 223 in addition to a flat area 221 .
- the web 223 is arranged on an edge 222 of the flat area 221 .
- the web 223 is designed to run around the flat area 221, ie the base body 220 is designed like a trough or a trough.
- the base body 220 it is also possible for the base body 220 to have a web 223 only partially on its edge.
- a ridge 223 can only be formed on each of the long sides.
- the web 223 results in increased flexural rigidity, so that the mirror 22 becomes significantly less sensitive to mechanical influences. This allows the material thickness and thus the material costs and the required cycle time to be reduced.
- the thickness of the planar area 221 is preferably less than or equal to 3.5 mm.
- the web 223 can also be realized with this thickness.
- a mirror layer 224 is in turn arranged on the base body 220 . This can be formed by a coating applied to the base body 220 or by a mirror element placed on the base body 220 . In FIG. 3 the mirror layer is arranged on that side of the base body 220 which is remote from the web 223 . In principle, however, it can also be arranged on the side of the base body 220 facing the web 223 . In the embodiment in FIG.
- the web 223 is inclined relative to a mirror axis 225 of the mirror 22 .
- the mirror axis 225 designates the normal to the mirror layer 224 in the center of the mirror layer 224. This makes it possible to introduce microstructures into the web 223 which reach to the lower edge of the mirror layer 224.
- the inclination of the web 223 relative to the mirror axis 225 can be of the order of 15°, for example.
- FIG. 4 illustrates the release position of a mirror 22 according to the invention by means of injection-compression molding.
- a section through the nozzle side DS and the ejector side AS of an injection compression tool can be seen.
- the base body 220 is shaped by means of an embossing die P.
- the material thickness of the base body 220 can be adjusted by varying the embossing die P.
- a flow channel tape gate is preferably used.
- the strip sprue 227 is indicated laterally on the web 223 in FIG. The use of a strip sprue 227 in connection with the flow channel technology has the advantage that the base body 220 does not need to be separated by milling after the injection molding or the injection compression molding.
- the embossing stamp P can be produced inexpensively, since it does not require the precision or polish of the mirror on its surface.
- FIG. 5 schematically shows a pre-deformation of an embossing die P to compensate for changes in shape.
- An enlarged section of the transition from web 223 to flat area 221 is shown. Due to the larger amount of material At this point and the associated corresponding volumetric shrinkage during cooling, there is a risk of a small deviation in shape in this area. This shape deviation can be reduced or completely prevented by a counteracting adjustment of the geometry of the embossing die P.
- the necessary pre-deformation of the embossing die P can be determined, for example, by simulations or tests.
- FIG. 6 schematically shows an antireflection structure 226 introduced into a web 223 of the mirror 22.
- an antireflection structure 226 can be introduced into the web 223 as the antireflection structure 226 .
- the web 223 is sufficiently inclined relative to the mirror axis, it is possible to introduce a microstructure into the web 223 by means of laser structuring, which microstructure extends to the lower edge of the mirror layer 224 .
- a microstructure that has a smaller depth can be introduced into the web 223 by means of sandblasting or similar technologies. In this case, the angle of the ridge 223 relative to the mirror axis can be reduced.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021203930.8A DE102021203930A1 (de) | 2021-04-20 | 2021-04-20 | Spiegel für ein Head-Up-Display |
| PCT/DE2022/200063 WO2022223084A1 (de) | 2021-04-20 | 2022-04-05 | Spiegel für ein head-up-display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4327141A1 true EP4327141A1 (de) | 2024-02-28 |
Family
ID=81385073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22718062.7A Pending EP4327141A1 (de) | 2021-04-20 | 2022-04-05 | Spiegel für ein head-up-display |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20240210679A1 (de) |
| EP (1) | EP4327141A1 (de) |
| CN (1) | CN117120882A (de) |
| DE (2) | DE102021203930A1 (de) |
| WO (1) | WO2022223084A1 (de) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20190146218A1 (en) * | 2016-05-10 | 2019-05-16 | Nippon Seiki Co., Ltd. | Head-up display device |
| DE102022103005A1 (de) * | 2021-03-11 | 2022-09-15 | Panasonic Intellectual Property Management Co., Ltd. | Head-up-Display |
Family Cites Families (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1062612A (ja) * | 1996-08-13 | 1998-03-06 | Fuji Xerox Co Ltd | プラスチックミラー |
| DE102004002012B4 (de) * | 2004-01-14 | 2006-03-23 | Franz Josef Summerer | Verfahren und Vorrichtung zum Einbringen von Kunststoffmasse in ein Spritzgusswerkzeug zur Herstellung flächiger Kunststoffteile |
| WO2007033580A1 (en) * | 2005-09-23 | 2007-03-29 | N-Lighten Technologies | Arbitrary surface optical element and method of making the same |
| JP2011150099A (ja) * | 2010-01-21 | 2011-08-04 | Nippon Seiki Co Ltd | ミラーユニット |
| DE102010043947A1 (de) | 2010-11-16 | 2012-05-16 | Robert Bosch Gmbh | Verfahren zur Herstellung eines Reflektionsspiegels |
| DE102012217131A1 (de) * | 2012-09-24 | 2014-03-27 | Robert Bosch Gmbh | Optikeinheit, Verfahren zur Herstellung |
| US20160131889A1 (en) * | 2013-07-01 | 2016-05-12 | Nec Corporation | Optical device for use with coherent terahertz light |
| WO2015159522A1 (ja) * | 2014-04-14 | 2015-10-22 | パナソニックIpマネジメント株式会社 | ヘッドアップディスプレイ、およびヘッドアップディスプレイを搭載した移動体 |
| WO2015159523A1 (ja) * | 2014-04-14 | 2015-10-22 | パナソニックIpマネジメント株式会社 | ヘッドアップディスプレイ、およびヘッドアップディスプレイを搭載した移動体 |
| JP6603883B2 (ja) * | 2014-04-14 | 2019-11-13 | パナソニックIpマネジメント株式会社 | ヘッドアップディスプレイ、およびヘッドアップディスプレイを搭載した移動体 |
| TW201606350A (zh) * | 2014-08-12 | 2016-02-16 | Automotive Res & Testing Ct | 抬頭顯示裝置 |
| JP6579319B2 (ja) * | 2014-11-12 | 2019-09-25 | 日本精機株式会社 | ヘッドアップディスプレイ装置 |
| DE102015206052A1 (de) | 2015-04-02 | 2016-10-06 | Robert Bosch Gmbh | Verfahren zum Herstellen einer Reflexionsvorrichtung für ein optisches System und Reflexionsvorrichtung für ein optisches System |
| WO2016189361A1 (en) | 2015-05-25 | 2016-12-01 | Bosch Car Multimedia Portugal, S.A. | Head-up display reflective mirror and support part, production method thereof |
| CN109477968B (zh) * | 2016-07-07 | 2021-08-13 | 麦克赛尔株式会社 | 平视显示装置 |
| US20210116706A1 (en) * | 2016-12-12 | 2021-04-22 | Konica Minolta, Inc. | Combiner, head-up display device, and method for manufacturing combiner |
| DE102016225343A1 (de) * | 2016-12-16 | 2018-06-21 | Robert Bosch Gmbh | Formkörper mit mindestens einem aufgetragenen Material |
| KR101909374B1 (ko) * | 2017-02-23 | 2018-10-17 | 엘지전자 주식회사 | 차량용 헤드 업 디스플레이 |
| JP6735476B2 (ja) * | 2017-05-31 | 2020-08-05 | パナソニックIpマネジメント株式会社 | 表示装置 |
| WO2019009402A1 (ja) * | 2017-07-06 | 2019-01-10 | 浜松ホトニクス株式会社 | 光学デバイス |
| JP7122919B2 (ja) * | 2018-09-21 | 2022-08-22 | マクセル株式会社 | 情報表示装置およびそれに用いる反射ミラー |
| CN115335756A (zh) | 2020-03-26 | 2022-11-11 | 株式会社小糸制作所 | 图像生成装置、反射镜以及平视显示器 |
-
2021
- 2021-04-20 DE DE102021203930.8A patent/DE102021203930A1/de not_active Withdrawn
-
2022
- 2022-04-05 US US18/287,545 patent/US20240210679A1/en active Pending
- 2022-04-05 DE DE112022002239.6T patent/DE112022002239A5/de active Pending
- 2022-04-05 EP EP22718062.7A patent/EP4327141A1/de active Pending
- 2022-04-05 WO PCT/DE2022/200063 patent/WO2022223084A1/de not_active Ceased
- 2022-04-05 CN CN202280025454.7A patent/CN117120882A/zh active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20190146218A1 (en) * | 2016-05-10 | 2019-05-16 | Nippon Seiki Co., Ltd. | Head-up display device |
| DE102022103005A1 (de) * | 2021-03-11 | 2022-09-15 | Panasonic Intellectual Property Management Co., Ltd. | Head-up-Display |
Non-Patent Citations (1)
| Title |
|---|
| See also references of WO2022223084A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022223084A1 (de) | 2022-10-27 |
| DE112022002239A5 (de) | 2024-02-29 |
| CN117120882A (zh) | 2023-11-24 |
| US20240210679A1 (en) | 2024-06-27 |
| DE102021203930A1 (de) | 2022-10-20 |
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