CN113495423B - Projection equipment and projection method - Google Patents
Projection equipment and projection method Download PDFInfo
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- CN113495423B CN113495423B CN202010249801.7A CN202010249801A CN113495423B CN 113495423 B CN113495423 B CN 113495423B CN 202010249801 A CN202010249801 A CN 202010249801A CN 113495423 B CN113495423 B CN 113495423B
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/28—Reflectors in projection beam
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/208—Homogenising, shaping of the illumination light
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- Transforming Electric Information Into Light Information (AREA)
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Abstract
The application provides a projection device and a method for adjusting the projection device, wherein the projection device comprises: comprising a housing, and an image light projector arranged in an inner space of the housing for generating image light and a light unifying element having an imaging surface, a principal ray of the image light being directed to the light unifying element, characterized in that the projection apparatus comprises: a first reflecting mirror disposed on a path along which image light emitted from the image light projector propagates in a first direction, the image light passing through the first reflecting mirror to form first image light propagating in a second direction; and the second reflector is arranged on the propagation path of the first imaging light, the first imaging light passes through the second reflector to form second imaging light propagating along the principal ray direction, and the second imaging light is projected onto the imaging surface of the dodging element in a matched manner, so that the projection image surface of the second imaging light is superposed with the imaging surface.
Description
Technical Field
The present application relates to the field of image data processing and generation, and more particularly, to a projection apparatus and a projection method.
Background
As one of the common image Generation units (PGUs), projection apparatuses are widely used in various application scenarios. Projection devices are also widely used in motor vehicles to implement Head-UP displays (HUDs). Currently vehicle-mounted HUDs include various types, such as W-HUD, C-HUD, and AR-HUD.
The vehicle-mounted HUD can project important driving information such as speed per hour, navigation and the like onto a windshield in front of a driver, and the driver can see the important driving information such as speed per hour, navigation and the like without lowering head or turning head as much as possible. On-vehicle HUD projects driving information to the place ahead with the parallel sight of driver, has avoided the driver to disperse the attention to the place ahead road because of the observation instrument, reduces the delay and the discomfort that eye focus need constantly adjust the production simultaneously.
The AR-HUD integrates the augmented reality technology and the HUD technology well, and can help a driver to analyze important driving information under the condition that the driver perceives a real driving environment. In the application scenario of AR-HUD, the AR picture tends to "blend in" approximately with objects in the real driving environment.
However, the technical development of the current vehicle-mounted HUD is not mature enough, the imaging quality is not ideal, and the vehicle-mounted HUD faces a great challenge on the technical level. And the lenses of AR-HUD are larger than the lenses of W-HUD, C-HUD and A-HUD. The PGU and other optics of the AR-HUD are more sensitive than the PGU and other optics of the W-HUD, C-HUD, and A-HUD. Therefore, the design of the AR-HUD overall machine faces even greater challenges.
The mainstream method of the existing technology for realizing the vehicle-mounted HUD is realized by adopting a set of PGU and a reflector. For example, the PGU optical path is fold-adjusted by a mirror. However, in this implementation, one mirror has a single function, and multi-function adjustment cannot be realized to ensure image plane quality.
Furthermore, in addition to the above-described in-vehicle HUD, there is a projection display demand for multi-imaging distance co-imaging in many other fields.
Disclosure of Invention
One aspect of the present application provides a projection apparatus, including: a housing, and an image light projector arranged in an inner space of the housing for generating image light and a light unifying element having an imaging surface to which a principal ray of the image light is directed, characterized in that the projection apparatus comprises: a first reflecting mirror disposed on a path along which image light emitted from the image light projector propagates in a first direction, the image light passing through the first reflecting mirror to form first image light propagating in a second direction; and the second reflector is arranged on the propagation path of the first imaging light, the first imaging light passes through the second reflector to form second imaging light propagating along the principal ray direction, and the second imaging light is projected onto the imaging surface of the dodging element in a matched manner, so that the projection image surface of the second imaging light is superposed with the imaging surface.
According to the embodiment of the present application, virtual surfaces perpendicular to each other defining a target position of the image light projector are marked as a first reference surface, a second reference surface, and a third reference surface; marking virtual surfaces defining the image light projector as a first virtual side, a second virtual side, and a third virtual side, wherein the first and second virtual sides are parallel to an axis of the imaging lens group, and the third virtual side is perpendicular to the axis of the imaging lens group; the positions of the image light projector, the first mirror, and the second mirror in the interior space are determined by: arranging the image light projector at an initial position close to the target position in the inner space, and directly projecting the image light emitted by the image light projector to the light homogenizing element; setting the second reflector on a dihedral angle bisection plane determined by the second reference plane and a second virtual side surface located at the initial position, mirroring the image light projector through the second reflector, and adjusting the position of the image light projector according to the mirrored image so that the adjusted second virtual side surface is coplanar with the second reference plane, and marking the adjusted position of the image light projector as a first folding position; setting the first reflector on a dihedral angle bisection plane determined by the first reference plane and a first virtual side surface located at a first folding position, mirroring the image light projector through the first reflector, and adjusting the position of the image light projector according to a mirror image to make the adjusted first virtual side surface coplanar with the first reference plane, so that the position of the image light projector after adjustment is marked as a second folding position; and translating the image light projector from the second turning position along the normal direction of a third reference surface until the optical path of the image light emitted by the image light projector reflected to the light homogenizing element through the first reflecting mirror and the second reflecting mirror is equal to the optical path of the image light projector directly projected to the light homogenizing element from the initial position, and then the image light projector reaches the target position.
According to an embodiment of the present application, the image light projector comprises an imaging lens group for imaging image information in an image generation unit and an image generation unit.
According to the embodiment of the application, the light homogenizing element is provided with a microstructure unit for diffusing the second imaging light, and the second imaging light is diffused by the microstructure unit and then imaged on the light homogenizing element.
According to an embodiment of the present application, the second imaging light is projected onto the imaging surface of the light unifying element to form third imaging light which propagates outward, wherein a first curved mirror and a second curved mirror are disposed in the internal space of the housing, wherein the first curved mirror is disposed on a propagation path of the third imaging light to project an image imaged on the light unifying element; and the second curved mirror is arranged on the propagation path of the image projected by the first curved mirror to project the image projected by the first curved mirror.
According to an embodiment of the application, the image light projector is arranged in the right half of the first curved mirror in the space of the housing.
According to an embodiment of the application, the image light projector is arranged in the left half of the first curved mirror in the space of the housing.
According to an embodiment of the application, the image light projector is arranged in the right half of the second curved mirror in the space of the housing.
According to an embodiment of the application, the image light projector is arranged in the left half of the second curved mirror in the space of the housing.
According to an embodiment of the present application, the projection apparatus further includes an adjusting device that adjusts spatial positions of the image light projector, the first mirror, the second mirror, and the dodging element so as to adjust a distance of the light.
According to an embodiment of the present application, the first mirror, the second mirror, and the light unifying element are modularized into a combined module, and the image light projector and the combined module are translated in an optical axis direction of the image light to adjust the image on the imaging surface of the light unifying element. Another aspect of the present application provides a method of adjusting a projection device. The method comprises the following steps: disposing an image light projector for generating image light and a light unifying element having an imaging surface in an inner space of a housing, wherein a principal ray of the image light is directed to the light unifying element; arranging a first reflecting mirror on a path along which the image light propagates in a first direction, the image light passing through the first reflecting mirror to form first image light propagating in a second direction; and arranging a second reflector on a propagation path of the first imaging light, wherein the first imaging light passes through the second reflector to form second imaging light propagating along the principal ray direction, and the second imaging light is projected onto the imaging surface of the dodging element in a matched manner, so that a projection image surface of the second imaging light is coincided with the imaging surface.
According to the embodiment of the present application, virtual surfaces perpendicular to each other defining the target position of the image light projector are marked as a first reference surface, a second reference surface, and a third reference surface; marking virtual surfaces defining the image light projector as a first virtual side surface, a second virtual side surface, and a third virtual side surface, wherein the first and second virtual side surfaces are parallel to an axis of the imaging lens group, and the third virtual side surface is perpendicular to the axis of the imaging lens group; the step of determining the positions of the image light projector, the first mirror and the second mirror comprises: disposing the image light projector at an initial position near the target position in the interior space such that the image light emitted by the image light projector is directed toward the light uniformizing element; setting the second reflector on a dihedral angle bisection plane determined by the second reference plane and a second virtual side surface located at the initial position, mirroring the image light projector through the second reflector, and adjusting the position of the image light projector according to a mirrored image so that the adjusted second virtual side surface is coplanar with the second reference plane, and then marking the adjusted position of the image light projector as a first turning position; setting the first reflector on a dihedral angle bisection plane determined by the first reference plane and a first virtual side surface located at a first folding position, mirroring the image light projector through the first reflector, and adjusting the position of the image light projector according to a mirror image to make the adjusted first virtual side surface coplanar with the first reference plane, so that the position of the image light projector after adjustment is marked as a second folding position; and translating the image light projector from the second folding position along the normal direction of a third reference surface, so that the optical path of the image light emitted by the image light projector reflected to the light homogenizing element through the first reflecting mirror and the second reflecting mirror is equal to the optical path of the image light projector directly projected to the light homogenizing element from the initial position, and then the image light projector reaches the target position.
According to an embodiment of the application, the image light projector in the method comprises an imaging lens group for imaging image information in an image generation unit and an image generation unit.
According to an embodiment of the application, the method further comprises: and a microstructure unit used for diffusing the second imaging light is arranged on the light uniformizing element, and the second imaging light is diffused by the microstructure unit and then imaged on the light uniformizing element.
According to an embodiment of the application, the method further comprises: the second imaging light is projected onto the imaging surface of the light unifying element to form third imaging light which propagates outwards, and the first curved mirror and the second curved mirror are arranged in the inner space of the shell, wherein the first curved mirror is arranged on a propagation path of the third imaging light to project an image formed on the light unifying element; and the second curved mirror is arranged on the propagation path of the image projected by the first curved mirror to project the image projected by the first curved mirror.
According to an embodiment of the application, the method further comprises: the image light projector is disposed in the right half of the first curved mirror in the space of the housing.
According to an embodiment of the application, the method further comprises: disposing the image light projector in a left half of the first curved mirror in the space of the housing.
According to an embodiment of the application, the method further comprises: disposing the image light projector in a right half of the second curved mirror in the space of the housing.
According to an embodiment of the application, the method further comprises: disposing the image light projector in a left half of the second curved mirror in the space of the housing.
According to an embodiment of the application, the projection apparatus in the method further comprises an adjusting device for adjusting the spatial positions of the image light projector, the first mirror, the second mirror and the dodging element so as to adjust the distance of the light rays.
According to an embodiment of the present application, the first mirror, the second mirror, and the light unifying element are modularized into a combined module, and the image light projector and the combined module are translated in an optical axis direction of the image light to adjust the image on the imaging surface of the light unifying element. According to the projection equipment and the method for adjusting the projection equipment, at least one of the following beneficial effects can be achieved:
the projection image plane and the dodging element have the adjustability of multiple degrees of freedom, the precision requirement of a structural part can be reduced, and the processing is simpler and more convenient;
under the same optical path, the light rays are reflected by the two groups of reflectors to perform twice light path folding, so that the space of the HUD can be effectively utilized, and the volume of the HUD is reduced;
the projection image can be projected to a target position in a limited space by using the deflection light path of the double reflectors, so that the matching precision of the projection image surface and the light homogenizing element is improved; and
the double-reflector combination adjustment can enable the image light to have multi-degree-of-freedom adjustment, and the imaging quality of the projection image surface is enhanced by adjusting the spatial position of the double reflectors.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is a schematic block diagram of a projection device according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a configuration of an image light projector according to an embodiment of the present application;
FIG. 3 is a schematic diagram of an image light projector in a first position and a second position and defining a second mirror according to an embodiment of the present application;
FIG. 4 is a schematic diagram of an image light projector in a second position and a third position and defining a first mirror according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a projection device according to another embodiment of the present application;
FIG. 6 is a schematic diagram of a projection device according to another embodiment of the present application;
FIG. 7 is a schematic diagram of a projection device according to another embodiment of the present application;
FIG. 8 is a schematic diagram of a projection device according to another embodiment of the present application;
FIG. 9 is a direction of freedom of the image light projector, the first mirror, the second mirror, and the dodging element according to an embodiment of the present application;
FIG. 10 is a schematic diagram of a light folding structure of a projection device according to another embodiment of the present application; and
fig. 11 is a flowchart of a projection method according to an embodiment of the present application.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first mirror discussed below may also be referred to as the second mirror without departing from the teachings of the present application. And vice versa.
In the drawings, the thickness, size and shape of the components have been slightly adjusted for convenience of explanation. The figures are purely diagrammatic and not drawn to scale. As used herein, the terms "approximately", "about" and the like are used as table-approximating terms and not as table-degree terms, and are intended to account for inherent deviations in measured or calculated values that would be recognized by one of ordinary skill in the art.
It will be further understood that terms such as "comprising," "including," "having," "including," and/or "containing," when used in this specification, are open-ended and not closed-ended, and specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of" appears after a list of listed features, it modifies that entire list of features rather than just individual elements in the list. Furthermore, the use of "may" mean "one or more embodiments of the application" when describing embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including engineering and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict. In addition, unless explicitly defined or contradicted by context, the specific steps included in the methods described herein are not necessarily limited to the order described, but can be performed in any order or in parallel. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 is a schematic block diagram of a projection apparatus according to an embodiment of the present application.
The projection apparatus 1000 includes an image light projector 1100, a first mirror 1200, a second mirror 1300, a light unifying element 1400, and a housing 1500.
The image light projector 1100, the first reflecting mirror 1200, the second reflecting mirror 1300, and the light uniformizing element 1400 are disposed in the housing 1500. As shown in fig. 1, the image light projector 1100 may include an imaging lens group 1120 and an image generation unit 1110. The image generation unit 1110 may be a PGU. Image information generated at the image generation unit 1110 may be projected out through the imaging lens group 1120 to form image light 1130. First mirror 1200 can be disposed in the path of travel of the image light, and image light 1130 is reflected by first mirror 1200 to form first image light 1210. Second mirror 1300 may be positioned in the path of travel of first imaged light 1210, and first imaged light 1210 is reflected by second mirror 1300 to form second imaged light 1310. The light unifying element 1400 may have an imaging surface, and the chief ray of the second imaging light 1310 is emitted to the light unifying element 1400 in a matching manner and is imaged on the imaging surface of the light unifying element 1400, that is, when the chief ray of the second imaging light 1310 is projected onto the imaging surface of the light unifying element 1400 at a theoretical incident angle, the projection image plane of the second imaging light 1310 matches the imaging surface of the light unifying element 1400, that is, the projection image plane of the second imaging light 1310 coincides with the imaging surface of the light unifying element 1400 to ensure that a complete image is formed on the imaging surface of the light unifying element 1400. The principal ray is a ray that the second imaging light 1310 propagates along the optical axis direction. The projection of the second imaged light 1310 onto the imaging surface of the light unifying element 1400 can form a third imaged light 1410 propagating outward.
As shown in fig. 2, according to an embodiment of the present application, the image light projector 1100 may be located in an XYZ three-dimensional coordinate system, where an XZ plane may be a first virtual side plane, a YZ plane may be a second virtual side plane, and an XY plane may be a third virtual side plane. In the present application, the image generation unit 1110 may be a three-dimensional stereoscopic figure, and may coincide with three coordinate planes in an XYZ three-dimensional coordinate system. The first side 1111 is on the first virtual side, the second side 1112 is on the second virtual side, and the third side 1113 is on the third virtual side. Conversely, the three side surfaces of the three-dimensional stereo graphic image generation unit 1110 may not coincide with the three coordinate surfaces in the XYZ three-dimensional coordinate system. For the sake of brevity, three side surfaces of the image generation unit 1110 in the present application each coincide with three coordinate surfaces in the XYZ three-dimensional coordinate system.
As shown in fig. 4, according to an embodiment of the present application, the predetermined location at which the image light projector 1100 is disposed within the housing 1500 is marked as a target location, referred to herein as 1541, defined by three virtual reference surfaces that are perpendicular to each other, a first reference surface 1510, a second reference surface 1520, and a third reference surface 1530, respectively. As shown in fig. 3, the position of the dodging element 1400 is first determined according to actual product requirements. To facilitate adjustment of the position of the image light projector 1100 within the housing 1500, the image light projector 1100 may be defined by a first virtual side, a second virtual side, and a third virtual side of an XYZ three-dimensional coordinate system. For brevity of description, the image light projector 1100 may be defined by the first side 1111, the second side 1112, and the third side 1113 in this application. The image light projector 1100 may be initially positioned inside the housing 1500 near a target location, referred to herein as an initial location 1511. The image light 1130 emitted by the image light projector 1100 at the initial position 1511 may be projected directly onto the light unifying element 1400. When the image light projector 1100 is disposed at the initial position 1511, the position of the second mirror 1300 may be determined, i.e., the second mirror 1300 may be disposed on a dihedral bisector of the second side 1112 and the second reference plane 1520. The second side surface 1112 and the second reference surface 1520 intersect each other, and an included angle between the two surfaces is a dihedral angle, and a dihedral angle bisector refers to a virtual bisector between the second side surface 1112 and the second reference surface 1520, which forms two dihedral angles with the second side surface 1112 and the second reference surface 1520, respectively, and the two dihedral angles are equal in magnitude. After the position of the second reflecting mirror 1300 is determined, the image light projector 1100 may be mirrored by the second reflecting mirror 1300, and the position of the image light projector 1100 may be adjusted according to the mirrored image so that the second side 1112 is coplanar with the second reference surface 1520. When the second side 1112 is coplanar with the second reference surface 1520, the location at which the image light projector 1100 is located can be labeled as a first fold location 1521.
As shown in fig. 4, when the image light projector 1100 is disposed at the first fold location 1521, the position of the first mirror 1200 may be determined, i.e., the first mirror 1200 is disposed on the dihedral bisector of the first side surface 1111 and the first reference surface 1510. The first side surface 1111 and the first reference surface 1510 are in an intersecting state, an included angle between the two surfaces is a dihedral angle, and a dihedral angle bisector is a virtual bisector between the first side surface 1111 and the first reference surface 1510, and forms two dihedral angles with the first side surface 1111 and the first reference surface 1510, respectively, and the two dihedral angles are equal in size. After the position of the first reflecting mirror 1200 is determined, the image light projector 1100 may be mirrored by the first reflecting mirror 1200, and the position of the image light projector 1100 may be adjusted according to the mirrored image such that the first side 1111 is coplanar with the first reference surface 1510. When the first side 1111 is coplanar with the first reference plane 1510, the image light projector 1100 is located at the second fold location 1531. When the image light projector 1100 is disposed at the second fold position 1531, the first side 1111 of the image light projector 1100 is coplanar with the first reference plane 1510, the second side 1112 is coplanar with the second reference plane 1520, and the third side 1113 is parallel to the third reference plane 1530. At this time, the coplanar state of the third side surface 1113 and the third reference surface 1530 can be achieved by merely translating (the amount of translation may be 0) the image light projector 1100 in the normal direction of the third reference surface 1530 from the second folded position 1531 or adjusting the configuration (e.g., lens shape, power, etc.) of the imaging lens group 1120. When the third side 1113 is coplanar with the third reference surface 1530, the optical path length of the image light emitted from the image light projector 1100 reflected by the first reflecting mirror 1200 and the second reflecting mirror 1300 to the light uniformizing element 1400 is equal to the optical path length of the image light emitted from the initial position 1511 by the image light projector 1100 directly projected to the light uniformizing element 1400. At this point, the image light projector 1100 reaches the predetermined target position 1541.
Image light emitted by the image light projector 1100 at the target position 1541 can propagate in the first direction 1131 and can pass through the first mirror 1200 to form first image light 1210 that propagates in the second direction 1220. First imaged light 1210 can be passed through second mirror 1300 to form second imaged light 1310. The second imaged light 1310 may propagate along the chief ray direction and may be projected onto an imaging surface of the light unifying element 1400.
According to the embodiment of the present disclosure, the light unifying element 1400 may be provided with a microstructure unit for diffusing the second imaging light 1310, and the second imaging light 1310 may be diffused by the microstructure unit to be imaged on the light unifying element 1400, and may be transmitted through the light unifying element 1400 to form the third imaging light 1410. The microstructure units (diffuiser) have an imaging display effect, and can change the divergence angle of light rays so as to improve the uniformity and brightness of an image. The microstructure units may be light scattering particles scattered on the light uniformizing element 1400, or may be electro-scattering particles turned on or off under the stimulation of an external excitation source such as an electric field. As shown in fig. 3, the projection image light from the image light projector 1100 is reflected by the first reflecting mirror 1200 and then is reflected to the second reflecting mirror 1300. Then, the second reflecting mirror 1300 reflects the light to the light uniformizing element 1400, and the microstructure units on the light uniformizing element 1400 uniformize the projected images and then sequentially image the images on the light uniformizing element 1400.
Fig. 5 is a schematic structural diagram of a projection device according to another embodiment of the present application.
The projection apparatus includes an image light projector 4100, a first reflector 4200, a second reflector 4300, a light uniformizing element 4400, a housing 4500, a first curved mirror 4600, and a second curved mirror 4700.
The image light projector 4100 may include an imaging lens group 4120 and an image generating unit 4110. The image generating unit 4110 may be a PGU. The image information generated at the image generating unit 4110 may be projected out through the imaging lens group 4120 to form image light. The image light projector 4100 is defined with three virtual reference surfaces perpendicular to each other, a first reference surface, a second reference surface, and a third reference surface, respectively, at a predetermined target position within the housing 1500. The image light projector 4100 is defined by three sides, a first side, a second side, and a third side. The image light projector 4100 may initially be located anywhere within the housing 1500 near the target location, referred to herein as an initial location. When the image light projector 4100 is disposed at the initial position, the position of the second mirror 4300 may be determined, that is, the second mirror 4300 may be disposed on a dihedral bisector of the second side surface and the second reference surface. The second side surface and the second reference surface are in an intersecting state, an included angle between the two surfaces is a dihedral angle, the dihedral angle bisection surface is a virtual bisection surface located between the second side surface and the second reference surface, the dihedral angle bisection surface and the second side surface and the second reference surface form two dihedral angles respectively, and the two dihedral angles are equal in size. After the position of the second reflector 4300 is determined, the image light projector 4100 may be mirrored by the second reflector 4300 and the position of the image light projector 4100 may be adjusted according to the mirrored image so that the second side surface is coplanar with the second reference surface. When the second side is coplanar with the second reference plane, the position at which the image light projector 4100 is located can be marked as a first fold position. When the image light projector 4100 is disposed at the first-time folding position, the position of the first reflector 4200 can be determined, that is, the first reflector 4200 is disposed on the dihedral bisector of the first side face and the first reference face. The first side face and the first reference face are in an intersecting state, the included angle between the two faces is a dihedral angle, the dihedral angle bisection face refers to a virtual bisection face located between the first side face and the first reference face, the dihedral angle bisection face and the first side face and the first reference face form two dihedral angles respectively, and the two dihedral angles are equal in size. After the position of the first reflecting mirror 4200 is determined, the image light projector 4100 may be mirrored by the first reflecting mirror 4200, and the position of the image light projector 4100 may be adjusted according to the mirrored image so that the first side is coplanar with the first reference surface. When the first side is coplanar with the first reference plane, the position at which the image light projector 4100 is located may be marked as a second folded position. When the image light projector 4100 is disposed at the second folding position, the first side surface of the image light projector 4100 is in a coplanar state with the first reference surface, the second side surface is in a coplanar state with the second reference surface, and the third side surface is in a parallel state with the third reference surface. At this time, the coplanar state of the third side surface and the third reference surface can be achieved by merely shifting the image light projector 4100 from the second folded position or adjusting the configuration (e.g., lens shape, power, etc.) of the imaging lens group 4120. When the third side surface is coplanar with the third reference surface, the optical path length of the image light emitted from the image light projector 4100 reflected by the first reflector 4200 and the second reflector 4300 to the light uniformizing element 4400 is equal to the optical path length of the image light emitted from the initial position 4511 by the image light projector 4100 directly projected to the light uniformizing element 4400. At this time, the image light projector 4100 reaches the predetermined target position 4541.
As shown in fig. 5, the image light projector 4100 is at a second fold position. The image light emitted from the image light projector 4100 may propagate in a first direction and may form first image light propagating in a second direction through the first reflector 4200. The first imaged light may be passed through a second mirror 4300 to form second imaged light. The second imaging light may propagate in the principal ray direction and may be projected onto the imaging surface of the light unifying element 4400. The light homogenizing element 4400 may be provided with a microstructure unit for diffusing the second imaging light, and the second imaging light may be imaged on the light homogenizing element 4400 after being diffused by the microstructure unit, and may penetrate through the light homogenizing element 4400 to form the third imaging light 4410. The microstructure units (diffuiser) have an imaging display effect, and can change the divergence angle of light rays so as to improve the uniformity and brightness of an image. The microstructure elements may be light scattering particles dispersed on the light uniformizing element 4400, or may be electro-scattering particles that are turned on or off under the stimulation of an external excitation source such as an electric field.
The first curved mirror 4600 may be disposed on a propagation path of the third imaging light 4410 to project an image formed on the light uniformizing element 4400, and the second curved mirror 4700 may be disposed on a propagation path of an image projected by the first curved mirror 4600 to project an image projected by the first curved mirror 4600. The third imaging light 4410 formed by transmission of the light uniformizing element 4400 can sequentially pass through the first curved mirror 4600 and the second curved mirror 4700 along the light propagation path. In an application scenario such as HUD, the first curved mirror 4600 and the second curved mirror 4700 may be designed based on the shape of the windshield of the motor vehicle in which the projection device is installed to eliminate or reduce various aberrations as much as possible. The first curved mirror 4600 and the second curved mirror 4700 reflect images formed on the dodging element 4400 onto the windshield.
As shown in fig. 5, an image light projector 4100 may be disposed at a left half portion of the first curved mirror 4600. Alternatively, as shown in fig. 6, the image light projector 4100 is disposed in the right half of the mirror of the first curved mirror 4600. In an application scene such as the HUD, disposing the image light projector 4100 in the right half of the first curved mirror 4600, or disposing the image light projector 4100 in the left half of the first curved mirror 4600, the HUD headspace can be effectively utilized to reduce the volume of the HUD.
As shown in fig. 7, an image light projector 4100 may be disposed on the right half of the second curved mirror 4700. Alternatively, as shown in fig. 8, the image light projector 4100 may be disposed at the left half of the second curved mirror 4700. In an application scenario such as a HUD, disposing the image light projector 4100 in the right half of the second curved mirror 4700, or disposing the image light projector 4100 in the left half of the second curved mirror 4700, the HUD headspace can also be effectively utilized to reduce the volume of the HUD.
According to an embodiment of the present application, the first reflector 4200, the second reflector 4300, and the light uniformizing element 4400 may be modularly integrated by a structural envelope to form a combined module. As shown in fig. 8, the image light projector and the combining module have degrees of freedom in the X1 direction S1, the Y1 direction S2, and the Z1 direction S3. The adjusting image light projector and the combining module can freely rotate in the X1 direction S1, the Y1 direction S2 and the Z1 direction S3, namely, the spatial position is adjustable, thereby adjusting the distance of the light rays between the image light projector and the combining module. The image light projector and the combining module are translated in the optical axis direction of the image light to adjust the image on the imaging surface of the light unifying element 4400, so that the focal point of the imaging light can be finally positioned on the light unifying element 4400.
As shown in fig. 10, the first mirror 5200, the second mirror 5300, and the light unifying element 5400 may be modularly integrated by a structural envelope to form a combined module 5500. Translating the image light projector 5100 or the combining module 5500 to adjust the folded path distance L1 between the image light projector 5100 and the first mirror 5200; the sum of the distance L1 of the folded route between the image light projector 5100 and the first reflecting mirror 5200, the distance L2 of the folded route between the first reflecting mirror 5200 and the second reflecting mirror 5300, and the distance L3 of the folded route between the second reflecting mirror 5300 and the light unifying element 5400 is made equal to the optical path distance for the image light emitted from the initial position by the image light projector to be directly projected onto the light unifying element, so that the image light is focused right at the focal point of the microcell on the light unifying element 5400. For example, in a HUD application, the actual position of the image light projector 5100 may be shifted from the theoretical target position due to the influence of the dimensional tolerance and the assembly accuracy of the HUD, thereby generating new first, second, and third reference surfaces. The sum of the distance L1 of the folded path between the image light projector 5100 and the first mirror 5200, the distance L2 of the folded path between the first mirror 5200 and the second mirror 5300, and the distance L3 of the folded path between the second mirror 5300 and the dodging element 5400 may be greater than or less than the theoretical projection distance of the image light projector 5100. Therefore, the present application is designed to translate the image light projector 5100 or the combined module 5500 back and forth to adjust the distance L1 of the folded path between the image light projector 5100 and the first reflecting mirror 5200, so that the sum of L1, the distance L2 of the folded path between the first reflecting mirror 5200 and the second reflecting mirror 5300, and the distance L3 of the folded path between the second reflecting mirror 5300 and the dodging element 5400 is equal to the theoretical projection distance of the image light projector 5100, thereby achieving axial adjustability between the image light projector 5100 and the first reflecting mirror 5200, the second reflecting mirror 5300, and the dodging element 5400, and ensuring that the image light emitted by the image light projector 5100 is focused exactly at the focal point of the dodging element 5400.
Fig. 11 is a flowchart of a projection method according to an embodiment of the present application.
The projection method 6000 may include: in operation S6100, an image light projector for generating image light and a light unifying element having an imaging surface are disposed in an inner space of the housing, wherein a principal ray of the image light is directed to the light unifying element; in operation S6200, a first mirror is disposed on a path along which image light propagates in a first direction, the image light forming first image light propagating in a second direction through the first mirror; and disposing a second mirror in a propagation path of the first imaging light, the first imaging light forming second imaging light propagating in a principal ray direction through the second mirror, and causing the second imaging light to be projected onto an imaging surface of the light unifying element in match such that a projected image surface of the second imaging light coincides with the imaging surface of the light unifying element in operation S6300.
According to an embodiment of the present application, the projection method may further include: marking virtual surfaces perpendicular to each other defining a target position of the image light projector as a first reference surface, a second reference surface, and a third reference surface; marking virtual surfaces defining the image light projector as a first virtual side surface, a second virtual side surface and a third virtual side surface, wherein the first virtual side surface and the second virtual side surface are parallel to an axis of the imaging lens group, and the third virtual side surface is perpendicular to the axis of the imaging lens group; wherein the step of determining the positions of the image light projector, the first mirror, and the second mirror comprises: the first step, set up the projector of the image light in the initial position close to target position in the inner space, make the image light that the projector of the image light launches direct projection to the dodging component; secondly, arranging a second reflector on a dihedral angle bisection plane determined by a second reference plane and a second virtual side surface located at the initial position, mirroring the image light projector through the second reflector, adjusting the position of the image light projector according to the mirrored image to enable the adjusted second virtual side surface to be coplanar with the second reference plane, and marking the adjusted position of the image light projector as a first turning position; thirdly, arranging a first reflector on a dihedral angle bisection plane determined by the first reference plane and the first virtual side surface located at the first folding position, mirroring the image light projector through the first reflector, adjusting the position of the image light projector according to the mirrored image, enabling the adjusted first virtual side surface to be coplanar with the first reference plane, and marking the adjusted position of the image light projector as a second folding position; and a fourth step of translating the image light projector from the second folding position so that the optical path of the image light emitted by the image light projector reflected to the light uniformizing element through the first reflecting mirror and the second reflecting mirror is equal to the optical path of the image light emitted by the image light projector from the initial position directly projected to the light uniformizing element, and then the image light projector reaches the target position.
According to an embodiment of the present application, the projection method may further include: and a microstructure unit for diffusing the second imaging light is arranged on the light uniformizing element, and the second imaging light is diffused by the microstructure unit and then imaged on the light uniformizing element.
According to an embodiment of the present application, the projection method may further include: the second imaging light is projected on the imaging surface of the dodging element to form third imaging light which propagates outwards, and the optical device is characterized in that a first curved mirror and a second curved mirror are arranged in the inner space of the shell, wherein the first curved mirror is arranged on the propagation path of the third imaging light to project an image formed on the dodging element; and the second curved mirror is arranged on the propagation path of the image projected by the first curved mirror to project the image projected by the first curved mirror.
According to an embodiment of the present application, the projection method may further include: the adjusting device adjusts the spatial positions of the image light projector, the first reflecting mirror, the second reflecting mirror, and the light uniformizing element to adjust the distance of the light.
The projection apparatus and method according to embodiments of the present application are mainly illustrated above with a vehicle-mounted HUD as an example. It will be appreciated by those skilled in the art, however, that the above-described scheme may also be applied to a variety of imaging scenarios without departing from the technical concepts taught by the present application,
the above description is only an embodiment of the present application and an illustration of the technical principles applied. It will be appreciated by a person skilled in the art that the scope of protection covered by this application is not limited to the embodiments with a specific combination of features described above, but also covers other embodiments with any combination of features described above or their equivalents without departing from the technical idea. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (22)
1. A projection apparatus includes a housing, and an image light projector disposed in an inner space of the housing for generating image light, and a light unifying element having an imaging surface to which a principal ray of the image light is directed,
characterized in that the projection device comprises:
a first reflecting mirror disposed on a path along which image light emitted from the image light projector propagates in a first direction, the image light passing through the first reflecting mirror to form first image light propagating in a second direction; and
a second reflector disposed on a propagation path of the first imaging light, wherein the first imaging light passes through the second reflector to form a second imaging light propagating along the principal ray direction, and the second imaging light is projected onto the imaging surface of the dodging element in a matching manner, so that a projection image plane of the second imaging light coincides with the imaging surface,
the optical path of the image light emitted by the image light projector reflected to the light homogenizing element through the first reflecting mirror and the second reflecting mirror is equal to the optical path of the image light emitted by the image light projector from the initial position directly projected to the light homogenizing element.
2. The projection device of claim 1 wherein the image light projector comprises an imaging lens group and an image generation unit, the imaging lens group being configured to image information in the image generation unit.
3. The projection apparatus of claim 2 wherein virtual surfaces perpendicular to each other defining the target position of the image light projector are marked as a first reference surface, a second reference surface, and a third reference surface;
marking virtual surfaces defining the image light projector as a first virtual side surface, a second virtual side surface, and a third virtual side surface, wherein the first and second virtual side surfaces are parallel to an axis of the imaging lens group, and the third virtual side surface is perpendicular to the axis of the imaging lens group;
wherein the positions of the image light projector, the first mirror, and the second mirror in the interior space are determined by:
disposing the image light projector at the initial position in the internal space near the target position such that the image light emitted by the image light projector is directed to the light homogenizing element;
setting the second reflector on a dihedral angle bisection plane determined by the second reference plane and the second virtual side surface located at the initial position, mirroring the image light projector through the second reflector, and adjusting the position of the image light projector according to the mirrored image so that the adjusted second virtual side surface is coplanar with the second reference plane, and then marking the position of the image light projector after adjustment as a first folding position;
setting the first reflector on a dihedral angle bisection plane determined by the first reference plane and a first virtual side surface located at a first folding position, mirroring the image light projector through the first reflector, and adjusting the position of the image light projector according to a mirror image to make the adjusted first virtual side surface coplanar with the first reference plane, so that the position of the image light projector after adjustment is marked as a second folding position; and
translating the image light projector from the second-time folding position along the normal direction of the third reference surface until the optical path of the image light emitted by the image light projector reflected to the light homogenizing element through the first reflecting mirror and the second reflecting mirror is equal to the optical path of the image light emitted by the image light projector from the initial position directly projected to the light homogenizing element, and then the image light projector reaches the target position.
4. The projection apparatus according to claim 1, wherein the light unifying element is provided with a microstructure unit for diffusing the second imaging light, and the second imaging light is diffused by the microstructure unit and then imaged on the imaging surface of the light unifying element.
5. The projection apparatus according to claim 4 wherein the second imaging light is projected onto the imaging surface of the light unifying element to form third imaging light propagating outward,
it is characterized in that a first curved mirror and a second curved mirror are arranged in the inner space of the shell,
wherein the first curved mirror is disposed on a propagation path of the third imaging light to project an image formed on the dodging element; and
the second curved mirror is disposed on a propagation path of the image projected by the first curved mirror to project the image projected by the first curved mirror.
6. The projection device of claim 5 wherein the image light projector is disposed in a right half of the first curved mirror in the interior space of the housing.
7. The projection device of claim 5 wherein the image light projector is disposed in a left half of the first curved mirror in the interior space of the housing.
8. The projection device of claim 5 wherein the image light projector is disposed in a right half of the second curved mirror in the interior space of the housing.
9. The projection device of claim 5 wherein the image light projector is disposed in a left half of the second curved mirror in the interior space of the housing.
10. The projection apparatus of any of claims 1-9 further comprising an adjustment device that adjusts the spatial positions of the image light projector, the first mirror, the second mirror, and the dodging element to adjust the distance of the light rays.
11. The projection apparatus of claim 10 wherein the first mirror, the second mirror, and the light unifying element are modularized into a combined module, and the image light projector and the combined module are translated in a direction of an optical axis of the image light to adjust the image on the imaging surface of the light unifying element.
12. A method of forming a projection device, the method comprising:
disposing an image light projector for generating image light at a predetermined target position within an inner space of the housing;
arranging a dodging element with an imaging surface at a specified position in the inner space of the housing;
disposing a first mirror and a second mirror along a propagation path of the image light within an inner space of the housing;
adjusting positions of the image light projector, the first mirror, and the second mirror such that:
after the image light is emitted to the first reflector along a first direction, the image light forms first image light which is transmitted along a second direction through the first reflector; and
the first imaging light forms second imaging light which is transmitted along the principal ray direction of the imaging light through the second reflector, the second imaging light is projected onto the imaging surface of the dodging element in a matching manner, the projection image surface of the second imaging light is coincident with the imaging surface, wherein,
the optical path of the image light emitted by the image light projector in response to the reflection of the image light by the first reflecting mirror and the second reflecting mirror to the light homogenizing element is equal to the optical path of the image light emitted by the image light projector from the initial position directly projected to the light homogenizing element, and the image light projector reaches the target position.
13. The method of claim 12 wherein the image light projector includes an imaging lens group for imaging image information in an image generation unit and an image generation unit.
14. The method according to claim 13, wherein virtual planes perpendicular to each other defining the target position of the image light projector are marked as a first reference plane, a second reference plane, and a third reference plane;
marking virtual surfaces defining the image light projector as a first virtual side surface, a second virtual side surface, and a third virtual side surface, wherein the first and second virtual side surfaces are parallel to an axis of the imaging lens group, and the third virtual side surface is perpendicular to the axis of the imaging lens group;
wherein determining the positions of the image light projector, the first mirror, and the second mirror comprises:
disposing the image light projector at the initial position in the internal space near the target position such that the image light emitted by the image light projector is directed to the dodging element;
setting the second reflector on a dihedral angle bisection plane determined by the second reference plane and a second virtual side surface located at the initial position, mirroring the image light projector through the second reflector, and adjusting the position of the image light projector according to the mirrored image so that the adjusted second virtual side surface is coplanar with the second reference plane, and marking the adjusted position of the image light projector as a first folding position;
setting the first reflector on a dihedral angle bisection plane determined by the first reference plane and a first virtual side surface located at a first folding position, mirroring the image light projector through the first reflector, and adjusting the position of the image light projector according to a mirror image to make the adjusted first virtual side surface coplanar with the first reference plane, so that the position of the image light projector after adjustment is marked as a second folding position; and
translating the image light projector from the second folding position along the normal direction of the third virtual surface until the optical path of the image light emitted by the image light projector reflected to the light homogenizing element by the first reflecting mirror and the second reflecting mirror is equal to the optical path of the image light emitted by the image light projector from the initial position directly projected to the light homogenizing element, and then the image light projector reaches the target position.
15. The method of claim 12, wherein a microstructure unit for diffusing the second imaging light is disposed on the light unifying element, and the second imaging light is diffused by the microstructure unit and then imaged on the imaging surface of the light unifying element.
16. The method of claim 15, wherein the second imaging light is projected onto an imaging surface of the light unifying element to form third imaging light that propagates outward,
characterized in that the method further comprises:
a first curved mirror is disposed along a propagation path of the third imaging light in the internal space of the housing to project an image formed on the light unifying element; and
in the inner space of the housing, a second curved mirror is disposed along a propagation path of the image projected by the first curved mirror to project the image projected by the first curved mirror.
17. The method of claim 16 wherein the image light projector is disposed in the right half of the first curved mirror in the interior space of the housing.
18. The method of claim 16 wherein the image light projector is disposed in a left half of the first curved mirror in the interior space of the housing.
19. The method of claim 16 wherein the image light projector is disposed in the right half of the second curved mirror in the interior space of the housing.
20. The method of claim 16 wherein the image light projector is disposed in a left half of the second curved mirror in the interior space of the housing.
21. The method according to any one of claims 12-20, further comprising:
the space positions of the image light projector, the first reflector, the second reflector and the dodging element are adjusted through an adjusting device in the projection equipment, so that the distance of light rays is adjusted.
22. The method of claim 21, wherein the first mirror, the second mirror, and the light unifying element are modularized into a combined module, and the image light projector and the combined module are translated in a direction of an optical axis of the image light to adjust the image on the imaging surface of the light unifying element.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6364490B1 (en) * | 1996-11-15 | 2002-04-02 | Vantage Lighting Incorporated | Virtual image projection device |
| CN104730712A (en) * | 2013-12-18 | 2015-06-24 | 现代自动车株式会社 | Display apparatus and method for vehicle |
| CN105242402A (en) * | 2015-11-02 | 2016-01-13 | 宁波舜宇车载光学技术有限公司 | HUD (Head Up Display) optical system and application thereof on motor vehicle |
| CN109031676A (en) * | 2017-06-08 | 2018-12-18 | 京东方科技集团股份有限公司 | Projection arrangement, head-up display device and vehicle-mounted vision-aided system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017163292A1 (en) * | 2016-03-24 | 2017-09-28 | パナソニックＩｐマネジメント株式会社 | Headup display device and vehicle |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6364490B1 (en) * | 1996-11-15 | 2002-04-02 | Vantage Lighting Incorporated | Virtual image projection device |
| CN104730712A (en) * | 2013-12-18 | 2015-06-24 | 现代自动车株式会社 | Display apparatus and method for vehicle |
| CN105242402A (en) * | 2015-11-02 | 2016-01-13 | 宁波舜宇车载光学技术有限公司 | HUD (Head Up Display) optical system and application thereof on motor vehicle |
| CN109031676A (en) * | 2017-06-08 | 2018-12-18 | 京东方科技集团股份有限公司 | Projection arrangement, head-up display device and vehicle-mounted vision-aided system |
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