CN107367842A - A kind of head-mounted display apparatus - Google Patents
A kind of head-mounted display apparatus Download PDFInfo
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- CN107367842A CN107367842A CN201710763387.XA CN201710763387A CN107367842A CN 107367842 A CN107367842 A CN 107367842A CN 201710763387 A CN201710763387 A CN 201710763387A CN 107367842 A CN107367842 A CN 107367842A
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- 238000012634 optical imaging Methods 0.000 claims abstract description 131
- 210000001747 pupil Anatomy 0.000 claims description 68
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000002310 reflectometry Methods 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 abstract description 47
- 238000013461 design Methods 0.000 abstract description 24
- 230000000007 visual effect Effects 0.000 abstract description 13
- 238000009434 installation Methods 0.000 abstract description 12
- 230000004075 alteration Effects 0.000 description 27
- 238000003384 imaging method Methods 0.000 description 19
- 238000012937 correction Methods 0.000 description 7
- 238000002834 transmittance Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 210000000720 eyelash Anatomy 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000005499 meniscus Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 210000003128 head Anatomy 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- 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
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
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- 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
- G02B2027/0123—Head-up displays characterised by optical features comprising devices increasing the field of view
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Abstract
The invention discloses a kind of head-mounted display apparatus, including：Housing, the optical imaging system being arranged in housing, optical imaging system include image display, lens section, the first reflecting part and the second reflecting part；Lens section is arranged on the front of image display, and the reflecting surface of the first reflecting part and the exiting surface of lens section are oppositely arranged, and the reflecting surface of the reflecting surface of the second reflecting part and the first reflecting part is oppositely arranged；The light sent on image display is incident to lens section, after the refraction of lens section, then through the first reflecting part reflecting surface and the second reflecting part reflecting surface reflection after, so that wearer watches image in the eye for the wearer for being incident to head-mounted display apparatus.The optical imaging system of the head-mounted display apparatus has flexible design, easily realizes the big angle of visual field, and each optical element installation site is more dispersed, has assembling simple, the characteristics of being readily produced.
Description
Technical Field
The invention relates to the technical field of head-mounted display imaging, in particular to head-mounted display equipment.
Background
In recent years, head-mounted display devices have been rapidly developed along with the development in the fields of optics, electronics, and the like. The head-mounted display device is internally provided with an optical imaging system, and the optical imaging system enables a wearer of the head-mounted display device to view image information displayed on a display screen through a combination of optical components such as a display and an optical lens.
In current head-mounted display equipment, in order to correct aberration and guarantee optical imaging quality, the number of optical components of an optical imaging system is large, and the problems of large size, heavy weight, inconvenience in wearing and the like exist. In addition, in the case where the number of optical components is large and the structure is complicated, the production and assembly are also a problem.
In summary, the overall design of the optical imaging system of the head-mounted display device in the prior art has the technical problems of complex structural design, complex production and assembly processes, and difficulty in meeting the requirement of a large field angle.
Disclosure of Invention
The embodiment of the invention provides a head-mounted display device, which is used for solving the technical problems that an optical imaging system of the existing head-mounted display device is complex in structural design, complicated in production and assembly processes and not easy to meet the requirement of a large field angle.
An embodiment of the present invention provides a head-mounted display device, including: a housing, an optical imaging system disposed within the housing; the optical imaging system comprises an image display, a lens part, a first reflection part and a second reflection part; the lens part is arranged in front of the image display, the reflection surface of the first reflection part is arranged opposite to the light outlet surface of the lens part, and the reflection surface of the second reflection part is arranged opposite to the reflection surface of the first reflection part; the light emitted from the image display is incident on the lens part, is refracted by the lens part, is incident on the reflecting surface of the first reflecting part, is incident on the reflecting surface of the second reflecting part after being reflected by the first reflecting part, and is incident on the eyes of a wearer of the head-mounted display equipment after being reflected by the second reflecting part, so that the wearer can watch images.
In an alternative embodiment, the light received by the wearer after being reflected by the second reflection part has a propagation direction in the same direction as the propagation direction of the light emitted by the image display.
In an optional embodiment, the optical imaging system further includes a third reflection portion, a reflection surface of the third reflection portion is disposed opposite to a reflection surface of the second reflection portion, and the light reflected by the second reflection portion enters the reflection surface of the third reflection portion, and enters the wearer's eye after being reflected by the third reflection portion.
In an alternative embodiment, the first reflection portion and the third reflection portion are disposed on the same side of the second reflection portion, and the propagation direction of the light received by the wearer after being reflected by the third reflection portion is opposite to the propagation direction of the light emitted by the image display.
In an alternative embodiment, the first and third reflective portions are interconnected; alternatively, the reflecting surfaces of the first reflecting portion and the third reflecting portion are separated from each other.
In an optional embodiment, when the optical imaging system further includes a third reflecting portion, a reflecting surface of the first reflecting portion is an aspheric surface or a free-form surface; the reflecting surface of the second reflecting part is a plane, an aspheric surface or a free-form surface; the reflecting surface of the third reflecting part is an aspheric surface or a free-form surface.
In an alternative embodiment, a functional film is disposed on the reflective surface of the third reflective portion, and the reflectance and transmittance of the functional film satisfy a set ratio.
In an alternative embodiment, when the optical imaging system further comprises a third reflecting part, the exit pupil distance of the optical imaging system is not less than 25 mm.
In an alternative embodiment, when the optical imaging system does not include the third reflecting part, the reflecting surface of the first reflecting part is an aspheric surface or a free-form surface, and the reflecting surface of the second reflecting part is an aspheric surface or a free-form surface.
In an alternative embodiment, when the optical imaging system does not include the third reflection portion, a functional film is disposed on the reflection surface of the second reflection portion, and the reflectance and transmittance of the functional film satisfy a set ratio.
In an alternative embodiment, when the optical imaging system does not include the third reflecting part, the exit pupil distance of the optical imaging system is not less than 10 mm.
In an alternative embodiment, the lens section comprises a single lens of positive power or a lens group of positive power.
In an alternative embodiment, the diagonal field angle when the wearer views the image is 40 ° to 55 °, and the diagonal field angle is the maximum viewing angle of the line of sight of the wearer in the diagonal direction of the image when the wearer views the image.
In the above embodiment, when the optical imaging system does not include the third reflection part, the overall design of the optical imaging system can compensate for the aberration, and in addition, the optical components are fewer, and the installation positions of the image display, the lens part, the first reflection part and the second reflection part are relatively dispersed, and no or little influence is caused between the image display, the lens part, the first reflection part and the second reflection part when the image display, the lens part, the first reflection part and the second reflection part are installed, so that the optical imaging system has the characteristics of simple assembly and easy; on the basis, the specific positions of the image display, the lens part, the first reflecting part and the second reflecting part can be flexibly designed according to the requirements of the field angle, the imaging quality and the like of the whole optical imaging system, and the large field angle is easy to realize.
In the above embodiment, when the optical imaging system includes the third reflection part, the above overall design of the optical imaging system can compensate for the aberration, and in addition, there are fewer optical components, and the installation positions of the image display, the lens part, the first reflection part, the second reflection part, and the third reflection part are relatively dispersed, and there is no or little influence between them when they are installed, so that the optical imaging system has the characteristics of simple assembly and easy production; on the basis, the specific positions of the image display, the lens part, the first reflection part, the second reflection part and the third reflection part can be flexibly designed according to the requirements of the field angle, the imaging quality and the like of the whole optical imaging system, and the large field angle is easy to realize.
Drawings
Fig. 1 is a schematic structural diagram of a head-mounted display device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another head-mounted display device according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating an optical path structure of an optical imaging system in a head-mounted display device according to an exemplary embodiment of the present invention;
FIG. 4 is a schematic MTF curve of an optical imaging system in a head-mounted display apparatus according to an exemplary embodiment of the present invention;
fig. 5 is a schematic diagram of an optical path structure of an optical imaging system in a head-mounted display device according to a second embodiment of the present invention;
FIG. 6 is a schematic MTF curve of an optical imaging system in a head-mounted display apparatus according to example two of the present invention;
fig. 7 is a schematic diagram of an optical path structure of an optical imaging system in a head-mounted display device according to an exemplary embodiment of the present invention;
fig. 8 is a schematic MTF curve diagram of an optical imaging system in a head-mounted display device according to an exemplary embodiment of the present invention.
Detailed Description
The following describes a head-mounted display device according to an embodiment of the present invention with reference to the drawings.
An embodiment of the present invention provides a head-mounted display device, including: a housing, an optical imaging system disposed in the housing, taking the optical imaging system shown in fig. 1 as an example, the optical imaging system includes: an image display S1, a lens portion S2, a first reflection portion S3, and a second reflection portion S4; the lens unit S2 is disposed in front of the image display unit S1, the reflection surface of the first reflection unit S3 is disposed opposite to the light exit surface of the lens unit S2, and the reflection surface of the second reflection unit S4 is disposed opposite to the reflection surface of the first reflection unit S3. The optical path of the optical imaging system shown in fig. 1 is: light emitted from the image display S1 enters the lens portion S2, is refracted by the lens portion S2, enters the reflective surface of the first reflective portion S3, is reflected by the first reflective portion S3, enters the reflective surface of the second reflective portion S4, is reflected by the second reflective portion S4, and enters the eye of the wearer of the head-mounted display device, so that the wearer views images. In the embodiment of the present invention, the light reflected by the second reflection portion S4 may be directly incident to the eye of the wearer, or may be transmitted or reflected by other optical components and then incident to the eye of the wearer.
The whole design of the optical imaging system can compensate aberration, the number of optical components is small, the installation positions of the image display S1, the lens part S2, the first reflection part S3 and the second reflection part S4 are dispersed, and no influence or little influence is caused among the image display S1, the lens part S2, the first reflection part S3 and the second reflection part S4 during installation, so that the optical imaging system has the characteristics of simple assembly and easy production; on the basis, the specific positions of the image display S1, the lens portion S2, the first reflection portion S3 and the second reflection portion S4 can be flexibly designed according to the requirements of the field angle, the imaging quality and the like of the whole optical imaging system, and a large field angle is easily realized.
For convenience of explanation, the optical imaging system can correct the aberration, taking the reverse optical path of the optical imaging system as an example, the light emitted from the human eye reaches the reflective surface of the second reflective portion S4 after passing through the exit pupil position S5, and reaches the reflective surface of the first reflective portion S3 after passing through the upward deflection reflection of the second reflective portion S4. Further, taking the forward optical path of the optical imaging system as an example, the light emitted from the image display S1 passes through the lens portion S2 and reaches the reflection surface of the first reflection portion S3, and the reflected light reflected by the reflection surface of the first reflection portion S3 is deflected downward and reaches the reflection surface of the second reflection portion S4. Therefore, the aberration of the upward deflected light and the aberration of the downward deflected light have certain compensation mutually, and the active correction of the aberration is realized.
Further alternatively, in the optical imaging system shown in fig. 1, the reflection surface of the second reflection part S4 is disposed obliquely with respect to the reflection surface of the first reflection part S3. In the embodiment of the present invention, the relative tilt arrangement means that the two optical components are arranged off-axis, and the optical axes are not coincident and parallel, but are intersected.
When the reflective surface of the second reflective portion S4 is disposed opposite to the reflective surface of the first reflective portion S3, the propagation direction of the light emitted from the image display S1 may be the same as the propagation direction of the light received by the eyes of the wearer after being reflected by the second reflective portion S4. The same direction refers to the light rays being transmitted in the same direction or the same direction range, for example, as shown in fig. 1, the transmission direction of the light rays received by the eyes of the wearer is along the Z-axis direction, and the transmission direction of the light rays emitted by the image display S1 is also along the Z-axis direction, so the two directions are the same, but of course, they may be different.
For example, in the optical imaging system shown in fig. 1, when the light reflected by the second reflecting portion S4 directly enters the eye of the wearer, or when the light reflected by the second reflecting portion S4 passes through the transmission without changing the direction of the light and then enters the eye of the wearer, the light received by the wearer after being reflected by the second reflecting portion S4 can be transmitted in the same direction as the light emitted by the image display S1 by the inclined arrangement of the reflecting surface of the first reflecting portion S3 with respect to the reflecting surface of the second reflecting portion S4.
It should be noted that, when the propagation direction of the light received by the wearer after being reflected by the second reflecting portion S4 is the same as the propagation direction of the light emitted by the image display S1, the optical imaging system can be applied to the application scene with a small exit pupil distance, because in the application scene with a small exit pupil distance, if the propagation direction of the light received by the wearer after being reflected by the second reflecting portion S4 is opposite to the propagation direction of the light emitted by the image display S1, when the wearer uses the head mounted display device, the distance between the image display S1 and the human eye is too close, and the image display S1 may partially interfere with the human face. Therefore, in order to ensure the structural rationality of the optical imaging system, in a scene with a small exit pupil distance, the optical imaging system can be used to realize that the propagation direction of the light received by the wearer after being reflected by the second reflecting part S4 is the same as the propagation direction of the light emitted by the image display S1.
For convenience of explaining the exit pupil distance, as shown in fig. 1, the internal space of the head-mounted display device further includes a space where the human eye constituting an optical path with the optical imaging system is located, the space where the human eye is located is represented by an exit pupil position S5, the exit pupil position S5 is a position where the optical imaging system emits light beams when the head-mounted display device is viewed by the human eye, and the exit pupil distance d is a shortest distance from a plane where the exit pupil position S5 is located to the reflection surface of the second reflection portion S4.
In an alternative embodiment, when the exit pupil diameter is 8mm, in order to ensure the structural reasonableness of the optical imaging system and the comfort of the user, the exit pupil distance of the optical imaging system should be no less than 10mm, i.e. still taking the optical imaging system as an example shown in fig. 1, the shortest distance d from the exit pupil position S5 to the reflective surface of the second reflective portion S4 should be no less than 10mm, so as to avoid the eyelashes of the human eyes from contacting the reflective surface of the second reflective portion S4 when the wearer uses the optical imaging system. It should be noted that the exit pupil diameter generally refers to the diameter of a bright spot formed after light is converged by an eyepiece, but for convenience of explaining the exit pupil diameter, an optical imaging system is usually modeled in a reverse direction, that is, a light path from a pupil of a human eye to an image display is constructed, at this time, the exit pupil diameter refers to the diameter of the pupil of the human eye, and generally, the diameter of the pupil of the human eye is 2-8mm, the diameters of the pupils of the human eye in different light environments are different, and as external light becomes dark, the diameter of the pupil of the human eye becomes larger, so the diameter of the exit pupil of the human eye in a dark environment is generally taken to be 8 mm. In the embodiment of the present invention, the exit pupil diameter refers to the size of the diameter of the pupil of the human eye.
In the optical imaging system shown in fig. 1, the traveling direction of the light ray received by the wearer after being reflected by the second reflecting portion S4 is the same as and obliquely intersects with the traveling direction of the light ray emitted from the image display S1. An included angle between the propagation direction of the light received by the wearer after being reflected by the second reflection portion S4 and the propagation direction of the light emitted by the image display S1 is α, which is still exemplified by the optical imaging system shown in fig. 1, because the lens portion S2 and the image display S1 are coaxially disposed, α is an included angle between the axis of the lens portion S2 and the Z-axis direction, which is equivalent to that the image display S1 and the lens portion S2 rotate synchronously by α. The image display S1 is matched with the lens part S2 to synchronously rotate alpha, so that the installation position of the image display S1 can be flexibly changed, and the application scene of the head-mounted display device is wider.
In an alternative embodiment, the traveling direction of the light received by the wearer after being reflected by the second reflecting portion S4 is the same as and parallel to the traveling direction of the light emitted from the image display S1, i.e., α is 0 °. For example, the traveling direction of the light received by the wearer after being reflected by the second reflecting portion S4 and the traveling direction of the light emitted from the image display S1 are both in the negative direction along the Z-axis, or both in the positive direction along the Z-axis.
In the embodiment of the invention, the light emitted from the image display S1 sequentially passes through the refraction of the lens portion S2 and the reflection of the first reflection portion S3 and the second reflection portion S4 and then enters the eyes of the wearer of the head-mounted display device, so that the wearer can watch the image. According to the characteristic that the visual angle in the horizontal direction is larger than the visual angle in the vertical direction when the human eyes watch the image, the visual angle of the wearer when the wearer watches the image in the embodiment of the invention comprises a horizontal visual angle, a vertical visual angle and a diagonal visual angle. The diagonal field angle is the maximum viewing angle of the sight line along the diagonal direction of the image when the wearer watches the image, the horizontal field angle is the maximum viewing angle of the sight line along the horizontal direction of the image when the wearer watches the image, and the vertical field angle is the maximum viewing angle of the sight line along the vertical direction of the image when the wearer watches the reflected image. For convenience of explanation, the horizontal direction and the vertical direction herein are exemplified by an image observed by the wearer as a two-dimensional image, the horizontal direction may be understood as a width direction of the image observed by the wearer, and the vertical direction may be understood as a height direction of the image observed by the wearer. Among them, the diagonal angle of view is related to the overall design of the entire optical imaging system and the image display, and the horizontal angle of view and the vertical angle of view are related to the dimensions of the image display in the horizontal and vertical directions.
In an alternative embodiment, the overall design of the optical imaging system can satisfy the requirement that the diagonal field angle of the wearer when viewing the image is 40-55 °.
In an alternative embodiment, the image display in the embodiment of the invention is a miniature image display, and the size range of the optional miniature image display is 0.5-0.7in, and the ratio of the horizontal and vertical sizes of the image display in the size range can be 4: 3.
In the embodiment of the present invention, when the ratio of the horizontal dimension to the vertical dimension of the image display is different, that is, when the ratio of the horizontal dimension to the vertical dimension is x: y, the ratio of the horizontal angle of view to the vertical angle of view also satisfies x: y, and should satisfyWherein A is the horizontal field angle, B is the vertical field angle, and C is the diagonal field angle.
So when the ratio of the horizontal and vertical direction dimensions of the image display S1 is 4:3, the ratio of the horizontal angle of view and the vertical angle of view of the image viewed by the wearer is also 4: 3. Further, when the overall design of the above optical imaging system satisfies that the diagonal angle of view of the image by the wearer is 50 °, the horizontal angle of view of the image by the wearer is 40 ° and the vertical angle of view of the image by the wearer is 30 ° at this screen size and screen scale.
In an alternative embodiment, the reflective surface of the second reflective portion S4 is coated with a functional film, and the reflectivity and the transmissivity of the functional film satisfy a predetermined ratio, such that the light emitted from the image display S1 sequentially enters the eye of the wearer of the head-mounted display device through the refraction of the lens portion S2, the reflection of the reflective surface of the first reflective portion S3, and the reflection of the reflective surface of the second reflective portion S4, so that the wearer can view a virtual image, and simultaneously, the natural light emitted from the external environment enters the eye of the wearer of the head-mounted display device through the transmission of the reflective surface of the second reflective portion S4, so that the wearer can view the external environment information.
In an alternative embodiment, the ratio of the transmittance to the reflectance of the functional film is 1:1, the functional film is a transflective film, and the second reflection part S4 is equivalent to a transflective mirror.
In an alternative embodiment, the ratio of transmittance to reflectance includes but is not limited to 1:1, and other values, such as 7:3, 5:5, 6:4, etc., can be determined according to the actual requirements of the overall design of the optical imaging system.
In an alternative embodiment, the reflective surface of the first reflective portion S3 is coated with a reflective film, such as a total reflective film, so that the reflective surface of the first reflective portion S3 mainly reflects light.
In an alternative embodiment, the lens portion S2 is a single lens, which is a positive power lens, such as a biconvex lens or a plano-convex lens.
In an alternative embodiment, in order to further improve the imaging quality, the lens portion S2 is a lens group including at least two lenses, and the specific surface shape of the lens group may be matched according to the first reflective portion S3 and the image display S1, so that the power of the whole lens group is positive.
In an alternative embodiment, the reflective surface of the second reflective part S4 is a plane, an aspheric surface, or a free-form surface, and the reflective surface of the first reflective part S3 is an aspheric surface or a free-form surface.
An embodiment of the present invention further provides a head-mounted display device, which can be applied to a scene with a large exit pupil distance, and the head-mounted display device includes: a housing, an optical imaging system disposed in the housing, taking the optical imaging system shown in fig. 2 as an example, the optical imaging system includes an image display S1, a lens portion S2, a first reflection portion S3, a second reflection portion S4, and a third reflection portion S6; the lens unit S2 is disposed in front of the image display unit S1, the reflection surface of the first reflection unit S3 is disposed opposite to the light exit surface of the lens unit S2, the reflection surface of the second reflection unit S4 is disposed opposite to the reflection surface of the first reflection unit S3, and the reflection surface of the third reflection unit S6 is disposed opposite to the reflection surface of the second reflection unit S4. The optical path of the optical imaging system shown in fig. 2 is: light emitted from the image display S1 enters the lens portion S2, enters the reflection surface of the first reflection portion S3 after being refracted by the lens portion S2, enters the reflection surface of the second reflection portion S4 after being reflected by the first reflection portion S3, enters the reflection surface of the third reflection portion S6 after being reflected by the second reflection portion S4, and enters the eye of the wearer of the head mount display device after being reflected by the third reflection portion S6.
In the embodiment of the present invention, the light reflected by the third reflection portion S6 may be directly incident to the eye of the wearer, or may be transmitted or reflected by other optical components and then incident to the eye of the wearer.
The whole design of the optical imaging system can compensate aberration, has fewer optical components, has dispersed installation positions of the image display S1, the lens part S2, the first reflection part S3, the second reflection part S4 and the third reflection part S6, has no or little influence on each other during installation, and has the characteristics of simple assembly and easy production; on the basis, the specific positions of the image display S1, the lens portion S2, the first reflection portion S3, the second reflection portion S4 and the third reflection portion S6 can be flexibly designed according to the requirements of the field angle, the imaging quality and the like of the whole optical imaging system, and a large field angle is easily realized.
Further alternatively, the reflection surface of the first reflection part S3 may be disposed to be inclined with respect to the reflection surface of the second reflection part S4, and the reflection surface of the third reflection part S6 may be disposed to be inclined with respect to the reflection surface of the second reflection part S4. In the embodiment of the present invention, the relative tilt arrangement means that the two optical components are arranged off-axis, and the optical axes are not coincident and parallel, but are intersected.
In an alternative embodiment, the image display S1 and the lens portion S2 are coaxially disposed, and the first reflective portion S3 and the lens portion S2 are disposed off-axis.
In the optical imaging system shown in fig. 2, the reflection surface of the third reflection part S6 and the reflection surface of the first reflection part S3 are not coaxial, and the reflection surface of the third reflection part S6 and the reflection surface of the first reflection part S3 are separated from each other.
In an alternative embodiment, the reflective surface of the third reflective part S6 is coaxial with the reflective surface of the first reflective part S3, and the reflective surface of the third reflective part S6 is separated from the reflective surface of the first reflective part S3.
In an alternative embodiment, the reflective surface of the third reflective portion S6 is coaxial with the reflective surface of the first reflective portion S3, and the reflective surface of the third reflective portion S6 is connected to the reflective surface of the first reflective portion S3, for example, the first reflective portion S3 and the third reflective portion S6 are integrally formed, such that the reflective surfaces of the first reflective portion S3 and the third reflective portion S6 are connected to each other.
For convenience of explanation, in order to realize aberration compensation in the optical imaging system, a reverse optical path of the optical imaging system is taken as an example, light emitted from a human eye reaches the reflective surface of the third reflective portion S6 after passing through the exit pupil position S5, reflected light reflected by the reflective surface of the third reflective portion S6 is deflected upward, and then reaches the reflective surface of the first reflective portion S3 after being reflected by the relay of the second reflective portion S4. Taking the forward optical path of the optical imaging system as an example, the light emitted from the image display S1 passes through the lens portion S2 and reaches the reflective surface of the first reflective portion S3, the reflected light reflected by the reflective surface of the first reflective portion S3 is deflected downward, and then the reflected light is transmitted and reflected by the second reflective portion S4 and reaches the reflective surface of the third reflective portion S6 to be deflected downward. Therefore, the aberration of the upward deflected light and the aberration of the downward deflected light are mutually compensated to a certain extent, and the active correction of the aberration is realized.
Further, in the optical imaging system shown in fig. 2, the first reflecting portion S3 and the third reflecting portion S6 are disposed on the same side of the second reflecting portion S4, and the traveling direction of the light received by the wearer after being reflected by the third reflecting portion S6 is opposite to the traveling direction of the light emitted from the image display S1.
When the propagation direction of the light received by the wearer after being reflected by the third reflection part S6 is opposite to the propagation direction of the light emitted from the image display S1, the optical imaging system can be applied to a scene with a large exit pupil distance. For convenience of explaining the exit pupil distance, as shown in fig. 2, the space where the human eye is located is represented by an exit pupil position S5, the exit pupil position S5 is a position where the light beam is emitted from the optical imaging system when the human eye views the head-mounted display device, and the exit pupil distance d is a shortest distance from a plane where the exit pupil position S5 is located to the reflecting surface of the third reflecting mirror S6.
In an alternative embodiment, in order to ensure the structural reasonableness of the optical imaging system and the comfort of the user, when the exit pupil diameter is 8mm, in order to ensure a sufficiently large exit pupil distance, the exit pupil distance of the optical imaging system should be no less than 25mm, that is, still taking the optical imaging system as an example shown in fig. 2, the shortest distance d from the plane where the exit pupil position S5 is located to the reflecting surface of the third reflecting portion S6 should not be less than 25mm, so as to avoid the eyelash of the eye of the wearer from contacting the reflecting surface of the third reflecting portion S6 when using the optical imaging system.
It should be noted that the exit pupil diameter generally refers to the diameter of a bright spot formed after light is converged by an eyepiece, but for convenience of explaining the exit pupil diameter, an optical imaging system is usually modeled in a reverse direction, that is, a light path from a pupil of a human eye to a display screen is constructed, at this time, the exit pupil diameter refers to the diameter of the pupil of the human eye, and generally, the diameter of the pupil of the human eye is 2-8mm, the diameters of the pupils of the human eye in different light environments are different, and as external light becomes dark, the diameter of the pupil of the human eye becomes larger, so the diameter of the exit pupil of the human eye in a dark environment is generally 8 mm. In the embodiment of the present invention, the exit pupil diameter refers to the size of the diameter of the pupil of the human eye.
In the optical imaging system shown in fig. 2, the traveling direction of the light ray received by the wearer after being reflected by the third reflection part S6 is opposite to and obliquely intersects with the traveling direction of the light ray emitted from the image display S1. The angle between the propagation direction of the light received by the wearer after being reflected by the third reflection portion S6 and the propagation direction of the light emitted by the image display S1 is α, and still taking the optical imaging system shown in fig. 2 as an example, since the lens portion S2 is coaxially disposed with the image display S1, α is the angle between the axis of the lens portion S2 and the Z-axis direction, which is equivalent to the synchronous rotation α of the image display S1 and the lens portion S2.
In an alternative embodiment, the traveling direction of the light received by the wearer after being reflected by the third reflecting portion S6 is opposite to and parallel to the traveling direction of the light emitted by the image display S1, i.e., α is 0 °, for example, the traveling direction of the light received by the wearer after being reflected by the third reflecting portion S6 is negative along the Z-axis, and the traveling direction of the light emitted by the image display S1 is positive along the Z-axis. Alternatively, the light rays received by the wearer after being reflected by the third reflecting portion S6 may travel in a positive Z-axis direction, and the light rays emitted by the image display S1 may travel in a negative Z-axis direction.
In the embodiment of the invention, the light emitted from the image display S1 sequentially passes through the refraction of the lens portion S2, the reflection of the first reflection portion S3, the reflection of the second reflection portion S4 and the reflection of the third reflection portion S6 and then enters the eyes of the wearer of the head-mounted display device, so that the wearer can watch the image. According to the characteristic that the visual angle in the horizontal direction is larger than the visual angle in the vertical direction when the human eyes watch the image, the visual angle of the wearer when the wearer watches the image in the embodiment of the invention comprises a horizontal visual angle, a vertical visual angle and a diagonal visual angle. The definitions of the various views are described in detail in the foregoing embodiments, and will not be repeated here.
In an alternative embodiment, the overall design of the optical imaging system can satisfy the requirement that the diagonal field angle of the wearer when viewing the image is 40-55 °.
In an alternative embodiment, the image display S1 in the embodiment of the invention is a miniature image display, and the size range of the optional miniature image display is 0.5-0.7in, and the ratio of the horizontal and vertical dimensions of the image display in the size range can be 4: 3.
When the ratio of the horizontal and vertical direction dimensions of the image display S1 is 4:3, the ratio of the horizontal angle of view and the vertical angle of view at which the wearer views the image is also 4: 3. Further, when the overall design of the above optical imaging system satisfies that the diagonal angle of view of the image by the wearer is 50 °, the horizontal angle of view of the image by the wearer is 40 ° and the vertical angle of view of the image by the wearer is 30 ° at this screen size and screen scale.
In an alternative embodiment, the reflective surface of the third reflective portion S6 is coated with a functional film, and the reflectivity and the transmittance of the functional film satisfy a predetermined ratio, such that the light emitted from the image display S1 sequentially passes through the refraction of the lens portion S2, the reflection of the reflective surface of the first reflective portion S3, the reflection of the second reflective portion S4, and the reflection of the reflective surface of the third reflective portion S6 and then enters the eye of the wearer of the head-mounted display device, so that the wearer can view a virtual image, and simultaneously, the natural light emitted from the external environment passes through the transmission of the reflective surface of the third reflective portion S6 and then enters the eye of the wearer of the head-mounted display device, so that the wearer can view the external environment information.
In an alternative embodiment, the ratio of the transmittance to the reflectance of the functional film is 1:1, the functional film is a transflective film, and the third reflection part S6 is equivalent to a transflective mirror.
In alternative embodiments, the ratio of transmittance to reflectance includes, but is not limited to, 1:1, and other values, such as 7:3, 5:5, 6:4, etc., may be determined according to the actual requirements of the overall design of the optical imaging system.
In an alternative embodiment, the reflective surface of the first reflective portion S3 is coated with a reflective film, such as a total reflective film, so that the reflective surface of the first reflective portion S3 mainly reflects light.
In an alternative embodiment, since the second reflecting portion S4 can relay and reflect the light reflected by the first reflecting portion S3 to the reflecting surface of the third reflecting portion S6, the reflecting surface of the second reflecting portion S4 can be coated with a reflecting film, such as a total reflecting film, which mainly plays a role of reflecting the light.
In an alternative embodiment, the lens portion S2 is a single lens, which is a positive power lens, such as a biconvex lens or a plano-convex lens.
In an alternative embodiment, in order to further improve the imaging quality, the lens portion S2 is a lens group including at least two lenses, and the specific surface shape of the lens group may be matched according to the first reflective portion S3 and the image display S1, so that the power of the whole lens group is positive.
As shown in fig. 2, the first and third reflection parts S3 and S6 are curved mirrors. In an alternative embodiment, the reflective surface of the third reflective portion S6 is aspheric or free-form surface, and the reflective surface of the first reflective portion S3 is aspheric or free-form surface.
As shown in fig. 2, the second reflection portion S4 is a plane mirror. In an alternative embodiment, the reflecting surface of the second reflecting portion S4 may be a plane, an aspheric surface, or a free-form surface.
Based on the same inventive concept, a first specific example of the head-mounted display device provided in the embodiment of the present invention includes: the optical imaging system comprises a shell and an optical imaging system arranged in the shell, wherein by taking fig. 3 as an example, any optical imaging system comprises a first reflecting part S3, a second reflecting part S4, a third reflecting part S6, a lens part S2 and an image display S1. The internal space of the head-mounted display device further includes a space where the human eye constituting an optical path with the optical imaging system is located, which is indicated by the exit pupil position S5. The relative position relationship among the first reflecting part S3, the second reflecting part S4, the third reflecting part S6, the lens part S2 and the image display S1 is as follows:
the lens unit S2 is disposed in front of the image display unit S1, the lens unit S2 is disposed coaxially with the image display unit S1, the reflection surface of the first reflection unit S3 is disposed opposite to the light exit surface of the lens unit S2, and the first reflection unit S3 is disposed off-axis from the lens unit S2. The third reflective portion S6 and the first reflective portion S3 are located on the same side of the reflective surface of the second reflective portion S4, so that the light reflected by the second reflective portion S4 can enter the reflective surface of the third reflective portion S6, and finally enter the wearer' S eye after being reflected by the third reflective portion S6.
The optical path of the optical imaging system is as follows: light emitted from the image display S1 passes through the lens portion S2 and enters the reflection surface of the first reflection portion S3, enters the reflection surface of the second reflection portion S4 after being reflected by the reflection surface of the first reflection portion S3, enters the reflection surface of the third reflection portion S6 after being reflected by the reflection surface of the second reflection portion S4, and enters the eyes of the wearer of the head-mounted display device after being reflected by the reflection surface of the third reflection portion S6, so that the wearer views images.
In the embodiment of the present invention, the image display S1, the lens portion S2, the first reflection portion S3, the second reflection portion S4, and the third reflection portion S6 satisfying the above positional relationship have relatively dispersed mounting positions, and the number of these optical components is small, and there is no or little influence between them during mounting, and the image display has the characteristics of simple assembly and easy production.
In the embodiment of the invention, the propagation direction of the light ray received by the wearer after being reflected by the third reflecting portion S6 is opposite to and parallel to the propagation direction of the light ray emitted by the image display S1, specifically, the propagation direction of the light ray received by the wearer after being reflected by the third reflecting portion S6 is along the negative direction of the Z axis, and the propagation direction of the light ray emitted by the image display S1 is along the positive direction of the Z axis. It should be noted that the coordinate system of the optical imaging system shown in fig. 3 is not illustrated, but is the same as the coordinate system in fig. 1.
In the embodiment of the present invention, in order to ensure the structural reasonableness of the optical imaging system and the comfort of the user, when the exit pupil diameter is 8mm, the exit pupil distance d of the optical imaging system is at least 25mm, so as to effectively prevent the eyelashes of the eyes of the wearer from contacting the reflecting surface of the third reflecting portion S6 when the optical imaging system is used.
In the embodiment of the invention, the overall design of the optical imaging system can meet the requirement that the diagonal field angle of a wearer when the wearer views an image is 50 degrees. In order to improve the comfort of the user, the size of the image display S1 in the embodiment of the invention is 0.5-0.7in, and the ratio of the horizontal and vertical dimensions of the image display S1 is 4: 3. Further, in this size, if the ratio of the size in the horizontal and vertical directions satisfied by the image display unit S1 is 4:3, the horizontal angle of view when the wearer views an image is 40 °, and the vertical angle of view when the wearer views an image is 30 °.
In the embodiment of the invention, the reflective surface of the third reflective portion S6 is plated with a transflective film, and the reflective surfaces of the first reflective portion S3 and the second reflective portion S4 are both plated with a total reflection film, so that light emitted from the image display S1 sequentially passes through refraction of the lens portion S2, reflection of the first reflective portion S3, reflection of the second reflective portion S4, and reflection of the third reflective portion S6 and then enters the eye of a wearer of the head-mounted display device, so that the wearer can view a virtual image, and meanwhile, natural light emitted from an external environment passes through the reflection of the third reflective portion S6 and then enters the eye of the wearer of the head-mounted display device, so that the wearer can view external environment information.
In the embodiment of the present invention, the lens portion S2 is a lenticular lens.
In the embodiment of the present invention, the reflection surface of the second reflection portion S4 is a plane.
In the embodiment of the present invention, the third reflection portion S6 and the first reflection portion S3 are respectively an upper portion and a lower portion of the reflector 101, that is, the reflection surface of the third reflection portion S6 and the reflection surface of the first reflection portion S3 are connected to each other and coaxially disposed, the positional relationship between the reflection surface of the third reflection portion S6 and the reflection surface of the first reflection portion S3 relative to the second reflection portion S4 has a certain symmetry, and the aberrations of the upward-deflected light generated on the third reflection portion S6 and the downward-deflected light generated on the reflection surface of the first reflection portion S3 are compensated to each other, so that the active correction of the aberrations is realized.
In the embodiment of the present invention, the reflective surface of the third reflective part S6 and the reflective surface of the first reflective part S3 are both aspheric surfaces, or the reflective surface of the third reflective part S6 and the reflective surface of the first reflective part S3 are both free-form surfaces.
In the embodiment of the present invention, taking as an example that the reflecting surface of the third reflecting part S6 and the reflecting surface of the first reflecting part S3 are both aspheric surfaces, the third reflecting part S6 and the first reflecting part S3 are respectively the upper and lower parts of the reflecting mirror 101, and the surface type of the reflecting mirror 101 is as follows:
where Z is a rise in the Z-axis direction, c is a curvature, and r is a radial coordinate in units of length units of the mirror 101, and satisfies x2+y2＝r2The coordinate of r is the coordinate value in the rectangular coordinate system created along the X-axis direction and the Y-axis direction, k is the cone coefficient,is a Zernike polynomial, AiIs a Zernike polynomial coefficient which is developed as:
wherein the Zernike polynomial term is
In the embodiment of the present invention, specific surface parameters of the reflecting mirror 101 are shown in table 1.
TABLE 1
| C | -0.0083 | Y2 | -1.8805704e-5 | X4 | -4.8078631e-8 |
| K | -1.2147289 | X2Y | -7.4586885e-8 | X2Y2 | -1.0699e-7 |
| X2 | -1.0527475e-4 | Y3 | -5.8538159e-7 | Y4 | -4.632375e-8 |
In a scene with a large exit pupil distance, in order to have a reasonable structure, the propagation direction of light rays received by the wearer after being reflected by the third reflecting part S6 is opposite to and parallel to the propagation direction of light rays emitted by the image display S1, the third reflecting part S6 and the first reflecting part S3 are arranged on the same side of the second reflecting part S4, and the whole design of the optical imaging system is convenient for production and assembly; on the basis, in order to correct the aberration and improve the imaging quality, the third reflecting part S6 and the first reflecting part S3 are respectively an upper part and a lower part symmetrically arranged on the reflecting mirror 101; in order to make the overall field angle of the optical system larger, the overall design of the optical imaging system meets the requirement that the diagonal field angle is 50 degrees; still further, in order to improve the comfort of human eyes, the diameter of an exit pupil of the optical imaging system is not less than 8mm, and the distance of the exit pupil is not less than 25 mm; meanwhile, the size of the screen of the image display S1 is 0.5-0.7in, and when the head-mounted display device is worn, the horizontal angle of view and the vertical angle of view of the image viewed by the wearer are 40 degrees and 30 degrees respectively.
In the embodiment of the present invention, based on the above design conditions that the optical imaging system satisfies, an MTF (modulation transfer function) curve of the optical imaging system is as shown in fig. 4, the MTF curve is very smooth from the center to the edge, the image transition is natural, the difference of imaging quality from the center to the edge is small, the correction effects of aberration, chromatic aberration, and the like of the entire optical system are good, and when the optical cutoff frequency is 10lp/mm, the MTF value is substantially greater than 0.7; the MTF values are basically greater than 0.2 when the optical cutoff frequency is 20lp/mm, and the MTF values are basically greater than 0.05 when the optical cutoff frequency is 30lp/mm, which shows that under the control of the above conditions of the embodiment, the imaging quality of the optical imaging system is very high and is far higher than 0.03 visually distinguished by human eyes, and the use requirement of high imaging quality is met.
Based on the same inventive concept, a second specific example of the head-mounted display device provided in the embodiment of the present invention includes: a housing, an optical imaging system disposed in the housing, taking fig. 5 as an example, the optical imaging system also includes a first reflection part S3, a second reflection part S4, a third reflection part S6, a lens part S2, and an image display S1. The internal space of the head-mounted display device also includes a space in which the human eye constituting an optical path with the optical imaging system is located, and the space in which the human eye is located is indicated by the exit pupil position S5. The relative positional relationship among the first reflective portion S3, the second reflective portion S4, the third reflective portion S6, the lens portion S2 and the image display S1, and the optical path of the optical imaging system are the same as those in the example shown in fig. 3, and will not be described in detail. The image display S1, the lens part S2, the first reflection part S3, the second reflection part S4 and the third reflection part S6 in the optical imaging system have the characteristics of relatively dispersed installation positions, no influence or little influence on each other during installation, simple assembly and easy production.
Compared with the example shown in fig. 3, the difference is that the third reflection part S6 and the first reflection part S3 are not two upper and lower parts of one mirror, but two separate different mirrors, wherein the third reflection part S6 and the first reflection part S3 are still coaxial, but the third reflection part S6 and the first reflection part S3 are separated from each other.
In the embodiment of the present invention, although the reflection surface of the third reflection portion S6 and the reflection surface of the first reflection portion S3 are separated from each other, the reflection surface of the third reflection portion S6 and the reflection surface of the first reflection portion S3 are also symmetrically disposed along the axis of the second reflection portion S4, so that the aberration of the upward-deflected light beam generated in the third reflection portion S6 and the aberration of the downward-deflected light beam generated in the reflection surface of the first reflection portion S3 are compensated for each other to a certain extent, and the active correction of the aberration can be achieved.
The reflective surfaces of the third reflective portion S6 and the first reflective portion S3 are both aspheric or both free-form surfaces. Taking the example that the reflective surfaces of the third reflective portion S6 and the first reflective portion S3 are aspheric, the surface type parameters of the third reflective portion S6 and the first reflective portion S3 are different from those of the example of fig. 3, and the surface type parameters of the third reflective portion S6 and the first reflective portion S3 are shown in tables 2-1 and 2-2, respectively.
TABLE 2-1
| C | -0.0083 | X4 | -1.1671458E-8 | X6 | -1.7685394E-11 |
| K | -1.3891197 | X2Y2 | -1.5687243E-07 | X4Y2 | 4.5801082E-13 |
| X2 | -1.618593E-4 | Y4 | -7.8366336E-8 | X2Y4 | 1.259393E-11 |
| Y2 | -2.0026644E-5 | X4Y1 | -7.2945216E-10 | Y6 | 3.0472452E-12 |
| X2Y | -1.045528E-6 | X2Y3 | 6.7126964E-10 | ||
| Y3 | -7.6353706E-7 |
Tables 2 to 2
| C | -0.0085 | X4 | -1.145678E-8 | X6 | -1.8534298E-11 |
| K | -1.4389601 | X2Y2 | -1.3427856E-07 | X4Y2 | 5.0623125E-13 |
| X2 | -1.395876E-4 | Y4 | -8.83442001E-8 | X2Y4 | 3.9658752E-11 |
| Y2 | -2,2064579E-5 | X4Y1 | -3.742156398-10 | Y6 | 4.5621896E-12 |
| X2Y | -1.4675122E-6 | X2Y3 | 7.2696471E-10 | ||
| Y3 | -7.6353706E-7 |
In the embodiment of the invention, in a scene with a large exit pupil distance, in order to have a reasonable structure, the propagation direction of the light rays received by the wearer after being reflected by the third reflecting part S6 is opposite to and parallel to the propagation direction of the light rays emitted by the image display S1, the third reflecting part S6 and the first reflecting part S3 are arranged on the same side of the reflecting surface of the second reflecting part S4, and the whole design of the optical imaging system is convenient for production and assembly; on this basis, in order to correct aberrations and improve imaging quality, the third reflecting part S6 and the first reflecting part S3 are separated from each other and coaxially disposed and the third reflecting part S6 and the first reflecting part S3 are symmetrically disposed along the axis of the second reflecting part S4; in order to make the overall field angle of the optical system larger, the overall optical imaging system is designed to meet the requirement that the diagonal field angle of a wearer when viewing an image is 50 degrees; still further, in order to improve the comfort of human eyes, the exit pupil diameter of the optical imaging system is not less than 8mm, the exit pupil distance is not less than 25mm, meanwhile, the size of the screen of the image display S1 is 0.5-0.7in, the ratio of the screen of the image display S1 is 4:3, and when the head-mounted display device is worn, the horizontal angle of view and the vertical angle of view of a wearer when viewing images are respectively 40 degrees and 30 degrees.
In the embodiment of the present invention, based on the above design conditions that the optical imaging system satisfies, the MTF curve of the optical imaging system is as shown in fig. 6, the MTF curve is very smooth from the center to the edge, the transition of the image is natural, the difference of the imaging quality from the center to the edge is small, the correction effects of the aberration, chromatic aberration, and the like of the entire optical system are good, and when the optical cutoff frequency is 10lp/mm, the MTF value is substantially greater than 0.6; the MTF values are basically larger than 0.2 when the optical cutoff frequency is 20lp/mm, and are basically close to 0.1 when the optical cutoff frequency is 30lp/mm, which shows that under the control of the above conditions of the embodiment, the imaging quality of the optical imaging system is very high and is far higher than 0.03 visually distinguished by human eyes, and the use requirement of high imaging quality is met.
An example three of the head-mounted display device provided in the embodiment of the present invention is applicable to an application scene with a small exit pupil distance, and the head-mounted display device includes: a housing, an optical imaging system disposed within the housing, as shown in fig. 7, the optical imaging system comprising: the image display device includes an image display S1, a lens portion S2, a first reflection portion S3, and a second reflection portion S4, wherein the lens portion S2 includes a meniscus lens 503 and a plano-convex lens 504, and the plano-convex lens 504 is located between the meniscus lens 503 and the image display S1. The internal space of the head-mounted display device further includes a space where the human eye constituting an optical path with the optical imaging system is located, which is indicated by the exit pupil position S5. The relative position relationship among the second reflecting part S4, the first reflecting part S3, the lens part S2 and the image display S1 is as follows:
the lens unit S2 is disposed in front of the image display unit S1, the reflection surface of the first reflection unit S3 is disposed opposite to the light exit surface of the lens unit S2, the lens unit S2 is disposed coaxially with the image display unit S1, and the first reflection unit S3 is disposed off-axis from the lens unit S2. In order to ensure the rational structure, the reflecting surface of the second reflecting portion S4 is disposed obliquely with respect to the reflecting surface of the first reflecting portion S3.
In an embodiment of the present invention, the optical path of the optical imaging system includes: light emitted from the image display S1 passes through the lens portion S2 and enters the reflection surface of the first reflection portion S3, is reflected by the reflection surface of the first reflection portion S3 and enters the reflection surface of the second reflection portion S4, and is reflected by the reflection surface of the second reflection portion S4 and enters the eyes of a wearer of the head-mounted display device, so that the wearer views images.
In the embodiment of the present invention, the second reflective portion S4, the first reflective portion S3, the lens portion S2 and the image display S1 satisfying the above positional relationship have relatively dispersed installation positions, have no or little influence on each other during installation, and have the characteristics of simple assembly and easy production.
In the embodiment of the present invention, the propagation direction of the light received by the wearer after being reflected by the second reflection portion S4 is the same as the propagation direction of the light emitted from the image display S1, and both are along the Z-axis forward direction, wherein the coordinate system (not shown) of the optical imaging system shown in fig. 7 is the same as the coordinate system of the optical imaging system shown in fig. 1, and the description thereof is omitted here.
In the embodiment of the invention, in order to ensure the structural reasonableness of the optical imaging system and the comfort of a user under the condition of a small exit pupil distance, when the diameter of the exit pupil is 8mm, the exit pupil distance d is not less than 10mm, so that eyelashes of eyes of a wearer are prevented from contacting with the reflecting surface of the second reflecting part S4 when the wearer uses the optical imaging system.
In the embodiment of the invention, the overall design of the optical imaging system can meet the requirement that the diagonal field angle of a wearer when the wearer views an image is 50 degrees. In order to improve the comfort of the user, the size of the image display S1 in the embodiment of the invention is 0.5-0.7in, and the ratio of the horizontal and vertical dimensions of the image display S1 is 4: 3. Further, in this size, if the ratio of the size in the horizontal and vertical directions satisfied by the image display unit S1 is 4:3, the horizontal angle of view when the wearer views an image is 40 °, and the vertical angle of view when the wearer views an image is 30 °.
In the embodiment of the invention, the reflective surface of the second reflective part S4 is plated with a semi-reflective and semi-transparent film, and the reflective surface of the first reflective part S3 is plated with a reflective film, so that light emitted from the image display S1 sequentially enters the eyes of a wearer of the head-mounted display device after being refracted by the lens part S2, reflected by the reflective surface of the first reflective part S3 and reflected by the reflective surface of the second reflective part S4, so that the wearer can watch a virtual image, and meanwhile, natural light emitted from an external environment enters the eyes of the wearer of the head-mounted display device after being transmitted by the reflective surface of the second reflective part S4, so that the wearer can watch external environment information.
In the embodiment of the present invention, the plano-convex lens 504 is a positive lens, and the meniscus lens 503 is a negative lens.
In the embodiment of the present invention, the reflective surface of the second reflective portion S4 is an aspheric surface or a free-form surface, and the reflective surface of the first reflective portion S3 is an aspheric surface or a free-form surface. Taking the example that the reflecting surface of the second reflecting part S4 and the reflecting surface of the first reflecting part S3 are both aspheric, the surface type formulas of the second reflecting part S4 and the first reflecting part S3 are shown in the formula one and the formula two. Specific surface shape parameters of the second reflective portion S4 are shown in table 3, and specific surface shape parameters of the first reflective portion S3 are shown in table 4.
TABLE 3
| C | -0.01 | X4 | 7.3725594e-6 |
| K | -480862923 | X2Y2 | 1.8468867e-5 |
| X2 | 9.0381526e-3 | Y4 | 5.260976e-06 |
| Y2 | 0.0387 | X4Y1 | 1.7369377e-7 |
| X2Y | 8.7510769e-4 | X2Y3 | 1.3746403e-7 |
| Y3 | 4.1235344e-4 | Y5 | 2.7075682e-8 |
TABLE 4
| C | -0.01 | X4 | -2.4290514e-7 |
| K | -480862923 | X2Y2 | -2.7886825e-6 |
| X2 | 1.6989316e-3 | Y4 | 3.7041e-6 |
| Y2 | 0.0149290 | X4Y1 | 4.8533466e-9 |
| X2Y | 1.6339926e-4 | X2Y3 | 6.5373895e-8 |
| Y3 | -3.0941953e-4 | Y5 | -4.395444e-9 |
In a scene with a small exit pupil distance, in order to be reasonable in structure, the propagation direction of light rays received by a wearer after being reflected by the second reflecting part S4 is the same as the propagation direction of light rays emitted by the image display S1 and is positive along the Z axis, the second reflecting part S4 is obliquely arranged relative to the first reflecting part S3, and the whole design of the optical imaging system is convenient to produce and assemble; in order to make the overall field angle of the optical system larger, the overall optical imaging system is also designed to meet the requirement that the diagonal field angle of the wearer when viewing the image is 50 °, and in order to correct the aberration and improve the imaging quality, the surface type parameters of the second reflecting part S4 and the first reflecting part S3 respectively meet tables 3 and 4; still further, in order to improve human eye comfort, the exit pupil diameter of the optical imaging system is not less than 8mm, and the exit pupil distance is not less than 10 mm. On this basis, the screen size of the image display S1 is preferably 0.61in, the screen ratio of the image display S1 is 4:3, and the horizontal angle of view and the vertical angle of view of the image when the wearer views the image when wearing the head-mounted display device are 40 ° and 30 °, respectively.
Based on the above design conditions satisfied by the optical imaging system, the MTF curve of the optical imaging system is as shown in fig. 8, the MTF curve is very smooth from the center to the edge, the transition of the picture is natural, the difference of the imaging quality from the center to the edge is small, the correction effects of the aberration, chromatic aberration and the like of the whole optical system are good, and when the optical cutoff frequency is 10lp/mm, the MTF value is basically greater than 0.4; the MTF values are basically greater than 0.1 when the optical cutoff frequency is 20lp/mm, and the MTF values are basically greater than 0.06 when the optical cutoff frequency is 30lp/mm, which shows that under the control of the above conditions of the embodiment, the imaging quality of the optical imaging system is very high and is far higher than 0.03 visually distinguished by human eyes, and the use requirement of high imaging quality is met.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit and scope of the application. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.
Claims (13)
1. A head-mounted display device, comprising:
a housing, an optical imaging system disposed within the housing;
the optical imaging system comprises an image display, a lens part, a first reflection part and a second reflection part;
the lens part is arranged in front of the image display, the reflection surface of the first reflection part is arranged opposite to the light outlet surface of the lens part, and the reflection surface of the second reflection part is arranged opposite to the reflection surface of the first reflection part;
the light emitted from the image display is incident on the lens part, is refracted by the lens part, is incident on the reflecting surface of the first reflecting part, is incident on the reflecting surface of the second reflecting part after being reflected by the first reflecting part, and is incident on the eyes of a wearer of the head-mounted display equipment after being reflected by the second reflecting part, so that the wearer can watch images.
2. The head-mounted display device of claim 1,
the transmission direction of the light rays received by the wearer after being reflected by the second reflection part is the same as the transmission direction of the light rays emitted by the image display.
3. The head-mounted display device of claim 1, wherein the optical imaging system further comprises a third reflection portion, a reflection surface of the third reflection portion is disposed opposite to a reflection surface of the second reflection portion, and the light reflected by the second reflection portion enters the reflection surface of the third reflection portion and is reflected by the third reflection portion to enter the wearer's eye.
4. The head-mounted display device of claim 3,
the first reflection part and the third reflection part are arranged on the same side of the second reflection part, and the propagation direction of the light received by the wearer after being reflected by the third reflection part is opposite to the propagation direction of the light emitted by the image display.
5. The head-mounted display device of claim 4, wherein the first reflective portion and the third reflective portion are connected to each other; or,
the reflecting surfaces of the first reflecting part and the third reflecting part are separated from each other.
6. The head-mounted display device of any of claims 3 through 5,
the reflecting surface of the first reflecting part is an aspheric surface or a free-form surface;
the reflecting surface of the second reflecting part is a plane, an aspheric surface or a free-form surface;
the reflecting surface of the third reflecting part is an aspheric surface or a free-form surface.
7. The head-mounted display device of any of claims 3 through 5,
and a functional film is arranged on the reflecting surface of the third reflecting part, and the reflectivity and the transmissivity of the functional film meet a set ratio.
8. A head-mounted display device as recited in any of claims 3 through 5, wherein the optical imaging system has an exit pupil distance of no less than 25 mm.
9. The head-mounted display device according to claim 1 or 2, wherein the reflective surface of the first reflective part is an aspherical surface or a free-form surface, and the reflective surface of the second reflective part is an aspherical surface or a free-form surface.
10. The head-mounted display device of claim 1 or 2,
and a functional film is arranged on the reflecting surface of the second reflecting part, and the reflectivity and the transmissivity of the functional film meet a set ratio.
11. The head-mounted display device of claim 1 or 2, wherein an exit pupil distance of the optical imaging system is not less than 10 mm.
12. The head-mounted display device of claim 1, wherein the lens portion comprises a single lens of positive power or a lens group of positive power.
13. The head-mounted display device of claim 1, wherein a diagonal field angle at which the image is viewed by the wearer is 40 ° to 55 °, and the diagonal field angle is a maximum viewing angle of a line of sight of the image in a diagonal direction of the image when the image is viewed by the wearer.
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| CN201710763387.XA CN107367842A (en) | 2017-08-30 | 2017-08-30 | A kind of head-mounted display apparatus |
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| CN201710763387.XA CN107367842A (en) | 2017-08-30 | 2017-08-30 | A kind of head-mounted display apparatus |
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| CN115079500A (en) * | 2022-08-22 | 2022-09-20 | 深圳市橙子数字科技有限公司 | Miniature optical engine |
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