CN107219637B - Short-distance optical amplification module, glasses, helmet and VR system - Google Patents
Short-distance optical amplification module, glasses, helmet and VR system Download PDFInfo
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- CN107219637B CN107219637B CN201610164151.XA CN201610164151A CN107219637B CN 107219637 B CN107219637 B CN 107219637B CN 201610164151 A CN201610164151 A CN 201610164151A CN 107219637 B CN107219637 B CN 107219637B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 238
- 239000011521 glass Substances 0.000 title claims description 21
- 230000003321 amplification Effects 0.000 title claims description 14
- 238000003199 nucleic acid amplification method Methods 0.000 title claims description 14
- 238000003384 imaging method Methods 0.000 claims abstract description 16
- 230000000694 effects Effects 0.000 abstract description 20
- 230000004424 eye movement Effects 0.000 abstract description 12
- 239000000463 material Substances 0.000 description 17
- 238000010586 diagram Methods 0.000 description 14
- 230000004075 alteration Effects 0.000 description 10
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- 238000005457 optimization Methods 0.000 description 8
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- 238000000034 method Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 4
- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000012937 correction Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000008358 core component Substances 0.000 description 2
- 230000004438 eyesight Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 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
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
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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
- G02B27/017—Head mounted
- G02B2027/0178—Eyeglass type
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Abstract
The invention discloses a short-distance optical amplifying module, which comprises a reflective polaroid, a first phase retarder, a third lens and a second phase retarder which are sequentially arranged, wherein any position on two sides of any one optical device in the reflective polaroid, the first phase retarder, the third lens and the second phase retarder is also provided with a first lens and a second lens, and an optical surface, which is close to the second phase retarder, in the third lens is a semi-transmission semi-reflection optical surface; the first focal length f3 of the third lens satisfies the following condition: f is more than or equal to 1F and less than or equal to 2F, wherein F is the system focal length of the short-distance optical amplifying module. Through carrying out parameter refinement to f3 that influences the optics and enlarge the effect for this module can also keep whole thickness less when obtaining great optics and enlarge the effect, can be applied in small-size VR equipment, make this VR equipment can realize better angle of view, great eye movement scope, high-quality imaging effect, bring better experience to the user.
Description
Technical Field
The invention relates to the technical field of optical instruments, in particular to a short-distance optical amplifying module, glasses, a helmet and a VR system.
Background
Currently, there is a short-distance optical amplifying module, in order to meet the imaging quality of the optical amplifying module, the module generally includes a plurality of optical devices, as shown in fig. 1, including a reflective polarizer 01, a first phase retarder 02, a lens unit 03, and a second phase retarder 04 in order from an image side to an object side, wherein an optical surface of the lens unit 03 near the second phase retarder 04 is a semi-transparent semi-reflective optical surface. In the use process, the optical image on the object side is transmitted and amplified through the lens unit 03, then reflected on the reflective polarizer 01, secondarily amplified through the lens unit 03, and finally enters the eye sight line through the reflective polarizer 01, wherein the core component affecting the amplifying effect of the optical image is the lens unit.
However, because each optical device needs a certain installation space, the optical amplifying module formed by a plurality of optical devices is often large in size and volume, and especially cannot meet the small-size and ultrathin structural requirements of intelligent VR (Virtual Reality) wearable equipment. I.e. short-range optics with high magnification still in a small space need to be designed for VR devices. Moreover, VR devices are also more focused on providing a good user experience, which in turn requires VR devices to achieve technical goals of better viewing angle, larger eye movement range, high quality imaging effect, etc. These technical objects are directly related to the optical characteristics of the above-mentioned lens group.
Therefore, in order to achieve the above objective, parameter setting needs to be performed on the lens group in the short-distance optical amplifying module, so that the above objective can be achieved within the whole VR device application range, and better experience is brought to the user.
Disclosure of Invention
The embodiment of the invention provides a short-distance optical amplifying module which can be used in VR equipment with small size, and achieves the purposes of better field angle, larger eye movement range and high-quality imaging effect of the VR equipment. Simultaneously, still provide glasses, helmet and VR system.
In order to solve the technical problems, the embodiment of the invention discloses the following technical scheme:
The utility model provides a short-distance optical amplification module, includes reflective polarizer, first phase delay piece, third lens and the second phase delay piece that arrange in proper order, and wherein any position in arbitrary optics both sides in reflective polarizer, first phase delay piece, third lens and the second phase delay piece still is equipped with first lens to and any position that is located in arbitrary optics both sides in reflective polarizer, first phase delay piece, third lens and the second phase delay piece is equipped with the second lens, wherein: the optical surface, close to the second phase retarder, in the third lens is a semi-transmission semi-reflection optical surface; the first focal length f3 of the third lens satisfies the following condition: f is more than or equal to 1F and less than or equal to 2F, wherein F is the system focal length of the short-distance optical amplifying module.
Preferably, in the above short-distance optical amplifying module, the first focal length f3 of the third lens satisfies the following condition: f is less than or equal to 1.5F 3 is less than or equal to 2F.
Preferably, in the above short-distance optical amplifying module, the focal length fS6 of the semi-transmissive and semi-reflective optical surface satisfies the following conditions: fS is less than or equal to 1.5F 6 is less than or equal to 5F.
Preferably, in the above-mentioned short-distance optical amplifying module, the focal length fS5 of the third lens, which is close to the optical surface of the second lens, satisfies the following condition: and the I fS5I is not less than 2F.
Preferably, in the above short-distance optical amplifying module, the system focal length F of the short-distance optical amplifying module satisfies the following conditions: f is more than or equal to 10mm and less than or equal to 32mm.
Preferably, in the above short-distance optical amplifying module, the focal length f2 of the second lens satisfies the following condition: f is less than or equal to-F2.
Preferably, in the above short-distance optical amplifying module, the focal length fS3 of the second lens near the optical surface of the first lens satisfies the following condition: and the I fS3I is not less than 2F.
Preferably, in the above short-distance optical amplifying module, the focal length fS4 of the second lens near the optical surface of the third lens satisfies the following condition: and the I fS4I is not less than 2F.
Preferably, in the above short-distance optical amplifying module, the focal length f1 of the first lens satisfies the following condition: f is less than or equal to 4F 1.
Preferably, in the above short-distance optical amplifying module, a focal length fS2 of the first lens close to the optical surface of the second lens is equal to a focal length f1 of the first lens.
Preferably, in the short-distance optical amplifying module, the thickness of the optical amplifying module is 8 mm-30 mm.
Preferably, in the above-mentioned short-distance optical amplifying module, the aperture D through which the light beam participating in imaging through the first lens, the second lens and the third lens passes satisfies the following condition: d is more than or equal to 0.3F and less than or equal to 0.6F.
Preferably, in the short-distance optical amplifying module, the eye distance of the short-distance optical amplifying module is 5-10 mm.
In addition, the invention also provides glasses comprising the short-distance optical amplifying module, and a display screen, wherein the display screen and the short-distance optical amplifying module are coaxially or non-coaxially arranged.
Furthermore, the invention also provides a helmet, which comprises the short-distance optical amplifying module and a display screen, wherein the display screen and the short-distance optical amplifying module are coaxially or non-coaxially arranged.
Finally, the invention also provides a VR system comprising the glasses or the helmet.
According to the technical scheme, the short-distance optical amplification module provided by the invention has the advantages that the effective focal length of the reflecting surface of the core component, namely the third lens, which affects the optical amplification effect is subjected to parameter refinement, so that the module can obtain a larger optical amplification effect and keep the overall thickness smaller, the module can be applied to VR equipment with small size, and the VR equipment can realize a better field angle, a larger eye movement range and a high-quality imaging effect, thereby bringing better experience to users.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of a short-distance optical amplifying module in the prior art;
fig. 2A and fig. 2B are schematic structural diagrams of a short-distance optical amplifying module according to a first embodiment of the present invention;
FIG. 3 is a distortion chart of a short-distance optical amplifying module according to a first embodiment of the present invention;
FIG. 4 is a schematic diagram of a short-distance optical amplifying module according to an embodiment of the present invention;
FIG. 5 is a schematic diagram showing an MTF of a short-distance optical amplifying module according to an embodiment of the present invention;
Fig. 6 is a schematic structural diagram of a short-distance optical amplifying module according to a second embodiment of the present invention;
FIG. 7 is a distortion chart of a short-distance optical amplifying module according to a second embodiment of the present invention;
FIG. 8 is a field diagram of a short-distance optical amplifying module according to a second embodiment of the present invention;
fig. 9 is an MTF diagram of a short-distance optical amplifying module according to a third embodiment of the present invention;
fig. 10 is a schematic structural diagram of a short-distance optical amplifying module according to a third embodiment of the present invention;
FIG. 11 is a distortion chart of a short-distance optical amplifying module according to a third embodiment of the present invention;
FIG. 12 is a field diagram of a short-distance optical amplifying module according to a third embodiment of the present invention;
fig. 13 is an MTF diagram of a short-distance optical amplifying module according to a third embodiment of the present invention;
Fig. 14 is a schematic structural diagram of a short-distance optical amplifying module according to a fourth embodiment of the present invention;
FIG. 15 is a distortion chart of a short-distance optical amplifying module according to a fourth embodiment of the present invention;
FIG. 16 is a schematic diagram of a short-distance optical amplifying module according to a fourth embodiment of the present invention;
Fig. 17 is an MTF diagram of a short-distance optical amplifying module according to a fourth embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Referring to fig. 2A, fig. 2B, fig. 6, fig. 10, and fig. 14, a schematic structural diagram of a short-distance optical amplifying module according to an embodiment of the present invention is shown. The short-distance optical amplifying module comprises a reflective polarizer, a first phase retarder, a third lens 30 and a second phase retarder which are sequentially arranged, wherein the first lens is further arranged at any position on two sides of any one optical device in the reflective polarizer, the first phase retarder, the third lens 30 and the second phase retarder, the second lens is further arranged at any position on two sides of any one optical device in the reflective polarizer, the first phase retarder, the third lens 30 and the second phase retarder, the reflective polarizer and the first phase retarder are shown as 50 in fig. 2A, fig. 2B, fig. 10 and fig. 14, the display screen is 40, and the second phase retarder is not shown. The first lens 10, the second lens 20 and the second lens 30 are core members for influencing the optical magnification effect, the focal length F of the system is 10-28 mm, and the first lens 10, the second lens 20 and the third lens 30 may be bonded or arranged with a certain distance.
The definition in this embodiment is: a first optical surface E1 near the first phase retarder and a second optical surface E2 near the second lens 20 in the first lens 10; the second lens 20 has a third optical surface E3 near the first lens 10 and a fourth optical surface E4 near the second phase retarder; in the third lens 30, a fifth optical surface E5 is adjacent to the second lens 20, and a sixth optical surface E6 is adjacent to the second phase retarder.
The optical image on the object side passes through the second phase retarder, the third lens 30, the second lens 20, the first lens 10 and the first phase retarder, then reaches the reflective polarizer, generates first reflection at the reflective polarizer, passes through the first phase retarder, the first lens 10, the second lens 20 and the fifth optical surface E5, then reaches the sixth optical surface E6, generates second reflection at the sixth optical surface E6, then sequentially passes through the second lens 20, the first lens 10, the first phase retarder and the reflective polarizer, and then enters the eye line of sight, so that the optical image can be reflected and amplified twice in the optical amplifying module, and the optical magnification requirement is met.
The third lens is a main source of system focal power, and meanwhile, the first lens 10 and the second lens 20 are arranged in the embodiment, and the two lenses are matched with each other, so that the focal length of the system can be shared, the mutual balance phase difference can be achieved, and the imaging quality can be improved.
In order to apply the short-distance optical amplifying module to the intelligent VR wearable device, the requirements of a better angle of view, an eye movement range, a high-quality imaging effect and a small-size ultrathin structure can be met, and the first focal length f 3 of the third lens (the focal length of the reflective optical surface in the third lens) meets the following conditions:
1F≤f3≤2F， (1)
Wherein F is the focal length of an optical system formed by the first lens, the second negative lens and the third lens. The focal length of the third lens, which is measured after the incident light passes through the fifth optical surface E5 and is reflected by the sixth optical surface E6, is defined as the focal length f 3 of the reflecting surface. The third lens (effective focal length with reflecting surface) is the main source of system focal power, if its focal power is too large, such as near the total focal power of the system (F 3.ltoreq.F), the aberration is hard to correct; if the focal power is too small (F 3 is more than or equal to 2F), the focal power of other lenses is too large, and the lenses are required to be added to correct the aberration, so that the system is not beneficial to miniaturization and light weight. Wherein the optical power is inversely proportional to the focal length. Preferentially, the first focal length f 3 of the third lens satisfies the following condition:
1.5F≤f3≤2F， (2)
The focal length F of the system formed by the first lens 10, the second negative lens 20 and the third lens 30 is 10 mm-32 mm, and meanwhile, the three lenses can be bonded together or have a certain interval. The shape and positional relationship of the three lenses are not limited as long as the focal length of the system is 10mm to 32 mm.
In the above formula (1), the third lens has a focal length f 3 of the reflecting surface, and such a lens is matched with a screen size of 0.9 to 3 inches, so that the whole optical system can obtain a larger viewing angle and can tolerate a large screen resolution, wherein the obtainable viewing angle V is 90 ° to 100 °, and the tolerable screen resolution is 800×800 to 4000×4000.
Based on the optimization purpose of achieving miniaturization and light weight, the focal length f S6 of the sixth optical surface, that is, the focal length f S6 of the semi-transmitting and semi-reflecting surface is set to satisfy the following conditions:
1.5F≤fS6≤5F。 (3)
Where F S6 represents the effective focal length reflected by the sixth optical surface, the reflecting surface of the sixth optical surface E6 being the primary source of system power, aberrations are difficult to correct if their power is too great, e.g., near the total system power (F S6. Ltoreq.F); meanwhile, the mirror surface is too bent, the lens thickness is larger, and the thickness of the system is increased, so that the requirement of thinning the VR wearing equipment is not met. On the contrary, if the optical power is too small (F S6 is larger than or equal to 5F), the optical power of other lenses is too large, and the lenses are required to be added to correct the aberration, so that the requirements of miniaturization and light weight of the system are not facilitated.
Also for the purpose of optimization for miniaturization and weight reduction, in the above-described third lens, the focal length f S5 of the fifth optical surface satisfies the following condition:
|fS5|≥2F (4)
If the focal length f S5 is too small, the third lens 30 is too curved, which is not beneficial to aberration correction; meanwhile, in combination with the second lens 20 and the third lens 10, the thickness of the planar excessively curved lens is larger, which results in an increase in the thickness of the optical system, and is not beneficial to the requirement of thinning the VR wearable device.
Also based on the optimization purpose of achieving miniaturization and light weight, the focal length f 2 of the second negative lens satisfies the following condition:
2F≤-f2 (5)
If the focal length F 2 is too small (|f 1 |+.2F), the surface shape of the second lens 20 is excessively curved, leading to larger aberration, and leading to larger aberration of the entire system; meanwhile, the thickness of the second lens 20 is also increased, which is not beneficial to the requirement of thinning the VR wearable device.
Also for the purpose of optimization for miniaturization and weight saving, in the second lens 20, the focal length f S3 of the third optical surface satisfies the following condition:
|fS3|≥2F (6)
If the focal length F S3 is too small (|F S3 |2F), the second lens 20 is too curved to be good for aberration correction; meanwhile, in combination with the first lens 10 and the third lens 30, the thickness of the planar excessively curved lens is larger, which results in an increase in the thickness of the optical system, and is not beneficial to the requirement of thinning the VR wearable device.
Also for the purpose of optimization for miniaturization and weight saving, in the second lens 20, the focal length f S4 of the fourth optical surface satisfies the following condition:
|fS4|≥2F (7)
If the focal length F S4 is too small (|F S4 |2F), the second lens 20 is too curved to be good for aberration correction; meanwhile, in combination with the first lens 10 and the third lens 30, the thickness of the excessively planar curved lens is large, which results in an increase in the thickness of the optical system, and is not beneficial to the requirement of thinning the VR wearable device.
Also based on the optimization purpose of achieving miniaturization and light weight, the focal length f 1 of the first lens satisfies the following condition:
4F≤f1 (8)
If the focal length F 1 is too small (|f 1 |+.4F), the surface shape of the first lens 10 is excessively curved, the introduced aberration is large, and the phase difference of the whole system becomes large; meanwhile, the thickness of the first lens 10 is also increased, which is not beneficial to the requirement of thinning the VR wearable device.
In order to meet the requirements of the VR wearing equipment on small size and ultrathin structure, the thickness of the optical amplifying module is 8-30 mm.
The VR equipment wearing comfort is considered, good imaging quality can be obtained, and the eye distance of the short-distance optical amplifying module is designed to be 5-10 mm.
As shown in fig. 2A, in order to obtain a large eye movement range and a better imaging quality, the adjustable range of the aperture on the object side is designed to be 1.7F-3.5F, that is, the aperture D through which the light beams passing through the first lens, the second lens and the third lens participate in imaging satisfies the following conditions:
0.3F≤D≤0.6F (9)
corresponding to equation (9), the eye movement range A can reach 5mm to 9mm.
On the basis of each technical scheme, the short-distance optical amplification module after several times of optimization can be applied to VR glasses, and the glasses further comprise a display screen which is coaxially or non-coaxially arranged with the short-distance optical amplification module. As shown in fig. 2A, fig. 2B is a case of coaxial arrangement, and no matter whether coaxial arrangement is performed or not, the optical magnification effect of the module is not affected, and the angle of view and the eye movement range are not affected.
On the basis of each technical scheme, the short-distance optical amplification module after several times of optimization can also be applied to a helmet, and the helmet further comprises a display screen, wherein the display screen and the short-distance optical amplification module are coaxially or non-coaxially arranged.
The short-range amplification module provided by the invention can also be applied to a VR system, and the system can comprise the glasses or the helmet or other wearing equipment suitable for being experienced by a user.
The short-distance optical amplifying module according to this embodiment is further described below with reference to the accompanying table.
In each embodiment, in the specific design parameter tables of the first lens 10, the second lens 20 and the third lens 30, OBJ represents an object in the optical system, IMA represents an image in the optical system, STO represents a stop in the optical system, i represents the order (i 0) +1 of the optical surface from the object side, the first lens 10 on the left side of the light ray is firstly directed to the second lens 20 on the right side and then directed to the third lens 30, and the material (Glass) is listed as MIRROR, namely, the reflection is carried out in the opposite direction, the reflection is carried out to the second MIRROR again, and the reflection is carried out from left to right, and finally the image surface is reached.
Example 1
As shown in fig. 2, in the short-distance optical amplifying module, the focal length F 3 of the reflecting surface of the third lens 30 is designed to be equal to the focal length F of the system,
The specific design parameters of the first lens 10, the second lens 20 and the third lens 30 are as follows:
In Table one, the first row of OBJ represents the relevant design parameters of the object plane; the third row STO represents a diaphragm in the optical system, the aperture being 9mm; the fourth row and the fifth row represent films formed by the reflective polarizer and the first phase retarder in the optical module, wherein the films are of a STANDARD STANDARD surface, BK7, 30.18156mm in diameter and 0 in aspheric coefficient; the sixth row and the seventh row respectively represent data corresponding to the first optical surface E1 and the second optical surface E2 of the first lens 10, wherein the radii of curvature of the first optical surface E and the second optical surface E2 are both the Infinity plane, the thickness of the first lens 10 is 2mm (i.e. the distance between the first optical surface E1 and the second optical surface E2, the thickness value in the sixth row data), and the material is H-LAK5A; the eighth row and the ninth row represent data corresponding to the third optical surface E3 and the fourth optical surface E4 of the second lens 20, where a radius of curvature of the third optical surface E3 is an Infinity plane, a radius of curvature of the fourth optical surface E4 is an Infinity plane, a thickness of the second lens 20 is 1.5mm (i.e., a distance between the third optical surface E3 and the fourth optical surface E4, a thickness value in the eighth row of data), and a material is H-ZF13. The tenth and eleventh rows represent data corresponding to the fifth and sixth optical surfaces E5 and E6 of the third lens element 30, respectively, wherein the fifth optical surface E5 has a radius of curvature of-68 and-66.19397, respectively, the thickness of the third lens element 30 is 2mm (i.e., the distance between the fifth optical surface E5 and the sixth optical surface E6, the thickness value in the tenth row data), and the material is H-LAK10.
The twelfth to twenty-fifth rows represent relevant parameters in reflection and transmission of light rays between the diaphragm, the first lens 10, the second lens 20 and the third lens 30. The second sixteen rows represent glass films in the liquid crystal layer of the display screen, wherein the thickness of the glass films is 0.3mm, and the material is BK7. The seventeenth row IMA represents an image in the optical system.
Other parameters corresponding to the short-distance optical amplifying module are shown in the following table two:
Watch II
From the MTF chart of fig. 5, it is obtained that the average ordinate (modulation transfer function) of each field of view is higher than the abscissa (spatial frequency per millimeter) of 0.18, the distortion rate in fig. 3 is controlled within the range (-30%, 0), the field curvature in fig. 4 is controlled within the range (-10 mm,10 mm), and the resolution of 400×400 can be supported by the view angle resolution of the short-distance optical amplifying module, that is, when the focal length of the third lens with the reflecting surface is 1F and the focal length of F S6 is 1F, the overall thickness can be kept small while obtaining a larger optical amplifying effect, so that the module can be applied to VR devices with small size, and the VR devices can realize better imaging effects of 100 ° in view angle, 9mm in larger eye movement range and high quality, and the screen resolution is 800×800, thereby bringing better experience to users.
Example two
As shown in fig. 6, in the short-distance optical amplifying module, the focal length F 3 of the reflecting surface of the third lens 30 is designed to be equal to the focal length 1.37F of the system,
The specific design parameters of the first lens 10, the second lens 20 and the third lens 30 are shown in table three:
Watch III
In Table three, the first row of OBJ represents the relevant design parameters for the object plane; the third row STO represents a diaphragm in the optical system, the aperture being 9mm; the fourth row and the fifth row represent films formed by the reflective polarizer and the first phase retarder in the optical module, wherein the films are of a STANDARD STANDARD surface, BK7, 26.09264mm in diameter and 0 in aspheric coefficient; the sixth row and the seventh row respectively represent data corresponding to the first optical surface E1 and the second optical surface E2 of the first lens 10, wherein the radii of curvature of the first optical surface E and the second optical surface E2 are respectively an Infinity plane and-89.75873, the thickness of the first lens 10 is 2mm (i.e. the distance between the first optical surface E1 and the second optical surface E2, the thickness value in the sixth row data), and the material is H-K9L; the eighth row and the ninth row represent data corresponding to the third optical surface E3 and the fourth optical surface E4 of the second lens 20, respectively, the radius of curvature of the third optical surface E3 is 84.66267 and 54.38812, the thickness of the second lens 20 is 1mm (i.e. the distance between the third optical surface E3 and the fourth optical surface E4, the thickness value in the eighth row data), and the material is H-ZF11. The tenth and eleventh rows represent data corresponding to the fifth and sixth optical surfaces E5 and E6 of the third lens element 30, respectively, the fifth optical surface E5 has a radius of curvature of 160.6342 and-54.28037, and the third lens element 30 has a thickness of 4mm (i.e., a distance between the fifth optical surface E5 and the sixth optical surface E6, a thickness value in the tenth row of data), and a material of D-LAK70.
The twelfth to twenty-fifth rows represent relevant parameters in reflection and transmission of light rays among the diaphragm, the first lens 10, the second lens 20 and the third lens. The second sixteen rows represent glass films in the liquid crystal layer of the display screen, wherein the thickness of the glass films is 1mm, and the material is BK7. The seventeenth row IMA represents an image in the optical system.
Other parameters corresponding to the short-distance optical amplifying module are shown in table four:
Table four
From the MTF chart of fig. 9, it is obtained that the average ordinate (modulation transfer function) of each field of view is higher than the abscissa (spatial frequency per millimeter) of 0.18, the distortion rate in fig. 7 is controlled within the (-30.5%, 0), the field curvature control in fig. 8 is controlled within the (-0.2 mm,0.2 mm), and further the resolution of 400 x 400 can be supported by the view angle resolution of the short-distance optical amplifying module, that is, when the focal length of the third lens with the reflecting surface is 1.37F and the focal length of F S6 is 2F, the overall thickness can be kept small while obtaining a larger optical amplifying effect, so that the module can be applied to VR devices with small size, and the VR devices can realize a better viewing angle of 96 °, a larger eye movement range of 7mm and a high-quality imaging effect of 1800 x 1800, thereby bringing better experience to users.
Example III
As shown in fig. 10, in the short-distance optical amplifying module, the focal length F 3 of the reflecting surface of the third lens 30 is designed to be equal to the focal length 1.5F of the system,
The specific design parameters of the first lens 10, the second lens 20 and the third lens 30 are shown in table five:
TABLE five
| Surf | Type | Comment | Radius | Thickness | Glass | Diameter | Conic |
| OBJ | STANDARD | Infinity | Infinity | 0 | 0 | ||
| 1 | PARAXIAL | - | 0 | 9 | - | ||
| STO | STANDARD | Infinity | 9 | 9 | 0 | ||
| 3 | STANDARD | Infinity | 0.3 | BK7 | 30.18156 | 0 | |
| 4 | STANDARD | Infinity | 0 | 30.53068 | 0 | ||
| 5 | STANDARD | Infinity | 4 | H-LAK5A | 30.53068 | 0 | |
| 6 | STANDARD | -126.3604 | 2.51823 | 33.47865 | 0 | ||
| 7 | STANDARD | 252.9636 | 1.5 | H-ZF13 | 41.40807 | 0 | |
| 8 | STANDARD | 123.3701 | 1.701081 | 43.19258 | 0 | ||
| 9 | STANDARD | 269.2846 | 5.5 | H-LAK10 | 44.98185 | 0 | |
| 10 | STANDARD | -101.0977 | -5.5 | MIRROR | 46.69545 | 0 | |
| 11 | STANDARD | 269.2846 | 1.701081 | 46.59742 | 0 | ||
| 12 | STANDARD | 123.3701 | -1.5 | H-ZF13 | 46.49442 | 0 | |
| 13 | STANDARD | 252.9636 | -2.51823 | 46.6367 | 0 | ||
| 14 | STANDARD | -126.3604 | -4 | H-LAK5A | 46.36075 | 0 | |
| 15 | STANDARD | Infinity | 0 | 46.02962 | 0 | ||
| 16 | STANDARD | Infinity | -0.3 | BK7 | 46.02962 | 0 | |
| 17 | STANDARD | Infinity | 0.3 | MIRROR | 45.97037 | 0 | |
| 18 | STANDARD | Infinity | 0 | 45.91112 | 0 | ||
| 19 | STANDARD | Infinity | 4 | H-LAK5A | 45.91112 | 0 | |
| 20 | STANDARD | -126.3604 | 2.51823 | 45.56688 | 0 | ||
| 21 | STANDARD | 252.9636 | 1.5 | H-ZF13 | 42.38623 | 0 | |
| 22 | STANDARD | 123.3701 | 1.701081 | 41.45218 | 0 | ||
| 23 | STANDARD | 269.2846 | 5.5 | H-LAK10 | 41.13083 | 0 | |
| 24 | STANDARD | -101.0977 | 0.5 | 4.025954 | 0 | ||
| 25 | STANDARD | Infinity | 0.3 | BK7 | 37.9971 | 0 | |
| 26 | STANDARD | Infinity | 0 | 37.89037 | 0 | ||
| IMA | STANDARD | Infinity | 37.89037 | 0 |
In Table five, the first row of OBJ represents the relevant design parameters for the object plane; the third row STO represents a diaphragm in the optical system, the aperture being 9mm; the fourth row and the fifth row represent films formed by the reflective polarizer and the first phase retarder in the optical module, wherein the films are of a STANDARD STANDARD surface, BK7, 30.18156mm in diameter and 0 in aspheric coefficient; the sixth row and the seventh row respectively represent data corresponding to the first optical surface E1 and the second optical surface E2 of the first lens 10, wherein the radii of curvature of the first optical surface E and the second optical surface E2 are respectively an Infinity plane and-126.3604, the thickness of the first lens 10 is 4mm (i.e. the distance between the first optical surface E1 and the second optical surface E2, the thickness value in the sixth row data), and the material is H-LAK5A; the eighth row and the ninth row represent data corresponding to the third optical surface E3 and the fourth optical surface E4 of the second lens 20, respectively, where the radius of curvature of the third optical surface E3 is 252.9636 and 123.3701, the thickness of the second lens 20 is 1.5mm (i.e. the distance between the third optical surface E3 and the fourth optical surface E4, the thickness value in the eighth row of data), and the material is H-ZF13. The tenth and eleventh rows represent data corresponding to the fifth and sixth optical surfaces E5 and E6 of the third lens element 30, respectively, wherein the fifth optical surface E5 has a radius of curvature of 269.2846 and-101.0977, the third lens element 30 has a thickness of 5.5mm (i.e., a distance between the fifth optical surface E5 and the sixth optical surface E6, a thickness value in the tenth row data), and the material is H-LAK10.
The twelfth to twenty-fifth rows represent relevant parameters in reflection and transmission of light rays among the diaphragm, the first lens 10, the second lens 20 and the third lens. The second sixteen rows represent glass films in the liquid crystal layer of the display screen, wherein the thickness of the glass films is 0.3mm, and the material is BK7. The seventeenth row IMA represents an image in the optical system.
Other parameters corresponding to the short-distance optical amplifying module are shown in table six:
TABLE six
From the MTF chart of fig. 13, values of the average ordinate (modulation transfer function) of each field of view higher than 0.18 (horizontal coordinate per millimeter of spatial frequency) are obtained, the distortion rate in fig. 11 is controlled within a (-34%, 0), the field curvature rate in fig. 12 is controlled within a (-0.2 mm,0.2 mm), and further, the resolution of 400 x 400 can be supported by the view angle resolution of the short-distance optical amplifying module. That is, when the focal length of the third lens element including the reflecting surface is 1.5F and the focal length of the F S6 is 2.1F, the overall thickness can be kept small while a larger optical amplifying effect is obtained, so that the module can be applied to a small-sized VR device, and the VR device can achieve a better field angle of 100 °, a larger eye movement range of 9mm and a high-quality imaging effect of 4000 x 4000, thereby bringing better experience to users.
Example IV
As shown in fig. 14, in the short-distance optical amplifying module, the focal length F 3 of the reflecting surface of the third lens 30 is designed to be equal to the focal length 2F of the system,
The specific design parameters of the first lens 10, the second lens 20 and the third lens 30 are shown in table seven:
watch seven
In Table seven, the first row of OBJ represents the relevant design parameters for the object plane; the third row STO represents a diaphragm in the optical system, the aperture being 9mm; the fourth row and the fifth row represent films formed by the reflective polarizer and the first phase retarder in the optical module, wherein the films are of a STANDARD STANDARD surface, BK7, 30.18156mm in diameter and 0 in aspheric coefficient; the sixth row and the seventh row respectively represent data corresponding to the first optical surface E1 and the second optical surface E2 of the first lens 10, wherein the radii of curvature of the first optical surface E and the second optical surface E2 are respectively an Infinity plane and-90.62525, the thickness of the first lens 10 is 6mm (i.e. the distance between the first optical surface E1 and the second optical surface E2, the thickness value in the sixth row data), and the material is H-LAK5A; the eighth row and the ninth row represent data corresponding to the third optical surface E3 and the fourth optical surface E4 of the second lens 20, respectively, the radius of curvature of the third optical surface E3 is 99 and 84.62125, the thickness of the second lens 20 is 1.5mm (i.e. the distance between the third optical surface E3 and the fourth optical surface E4, the thickness value in the eighth row data), and the material is H-ZF13. The tenth and eleventh rows represent data corresponding to the fifth and sixth optical surfaces E5 and E6 of the third lens 30, wherein the radius of curvature of the fifth optical surface E5 is equal to-160, and the thickness of the third lens 30 is 4mm (i.e., the distance between the fifth optical surface E5 and the sixth optical surface E6, the thickness value in the tenth row data), and the material is H-LAK10.
The twelfth to twenty-fifth rows represent relevant parameters in reflection and transmission of light rays among the diaphragm, the first lens 10, the second lens 20 and the third lens. The second sixteen rows represent glass films in the liquid crystal layer of the display screen, wherein the thickness of the glass films is 0.3mm, and the material is BK7. The seventeenth row IMA represents an image in the optical system.
Other parameters corresponding to the short-distance optical amplifying module are shown in the table eight:
Table eight
From the MTF chart of fig. 17, values of the average ordinate (modulation transfer function) of each field of view higher than 0.18 (spatial frequency per millimeter) are obtained, the distortion rate in fig. 15 is controlled within a (-33.6%, 0), the field curvature in fig. 16 is controlled within a (-2 mm,2 mm), and further, the resolution of 400 x 400 can be supported by the view angle resolution of the short-distance optical amplifying module. That is, when the focal length of the third lens element including the reflecting surface is 2F, and the focal length of the F S6 is 2.67F, the overall thickness can be kept small while a large optical amplifying effect is obtained, so that the module can be applied to a small-sized VR device, and the VR device can achieve a better field angle of 100 °, a larger eye movement range of 9mm, and a high-quality imaging effect of 1200 x 1200, thereby bringing a better experience to the user. Meanwhile, it should be noted that when the focal length of the third lens element including the reflecting surface is 2F, the focal length of F S6 is not set to 2.67F, and the above technical object can be achieved by adjusting the focal length of the first lens element and/or the second lens element, so long as F S6 is within the range of 1F-5F.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing is merely illustrative of the embodiments of this invention and it will be appreciated by those skilled in the art that variations and modifications may be made without departing from the principles of the invention, and it is intended to cover all modifications and variations as fall within the scope of the invention.
Claims (13)
1. The short-distance optical amplifying module is characterized by comprising a reflective polaroid, a first phase retarder, a third lens and a second phase retarder which are sequentially arranged, wherein any position on two sides of any one optical device in the reflective polaroid, the first phase retarder, the third lens and the second phase retarder is further provided with the first lens, and any position on two sides of any one optical device in the reflective polaroid, the first phase retarder, the third lens and the second phase retarder is provided with the second lens, wherein: the optical surface, close to the second phase retarder, in the third lens is a semi-transmission semi-reflection optical surface; the first focal length f 3 of the third lens satisfies the following condition: 1F is less than or equal to F 3 is less than or equal to 2F, wherein F is the system focal length of the short-distance optical amplifying module, F 3 is the focal length measured after incident light passes through a fifth optical surface and is reflected by a sixth optical surface, the fifth optical surface is the surface of the third lens close to the second lens, the sixth optical surface is the surface of the third lens close to the second phase retarder, and the system focal length F of the short-distance optical amplifying module meets the following conditions: f is more than or equal to 10mm and less than or equal to 32mm; the focal length f S6 of the semi-transmitting and semi-reflecting optical surface meets the following conditions: f S6 to 5F; the focal length f S5 of the third lens, which is close to the optical surface of the second lens, satisfies the following conditions: and the I F S5 I is not less than 2F.
2. The short-range optical amplifying module according to claim 1, wherein the first focal length f 3 of the third lens satisfies the following condition: f 3 to 2F.
3. The short-range optical amplifying module according to claim 1 or 2, wherein the focal length f 2 of the second lens satisfies the following condition: and the F is less than or equal to-F 2.
4. The short-range optical amplifying module according to claim 1 or 2, wherein the focal length f S3 of the second lens close to the optical surface of the first lens satisfies the following condition: and the I F S3 I is not less than 2F.
5. The short-distance optical amplifying module according to claim 1 or 2, wherein the focal length f S4 of the second lens close to the optical surface of the third lens satisfies the following condition: and the I F S4 I is not less than 2F.
6. The short-range optical amplifying module according to claim 1 or 2, wherein the focal length f 1 of the first lens satisfies the following condition: f is not more than F 1.
7. The short-range optical amplification module of claim 6, wherein a focal length f S2 of the first lens adjacent to the optical surface of the second lens is equal to a focal length f 1 of the first lens.
8. A short-range optical amplifying module according to claim 1 or 2, wherein the thickness of the optical amplifying module is 8-30 mm.
9. The short-distance optical magnification module according to claim 1 or 2, wherein a caliber D through which the light beam participating in imaging passes through the first lens, the second lens, and the third lens satisfies the following condition: d is more than or equal to 0.3F and less than or equal to 0.6F.
10. The short-distance optical amplifying module according to claim 1 or 2, wherein the eye distance of the short-distance optical amplifying module is 5-10 mm.
11. Glasses comprising a short-range optical amplifying module according to any of claims 1-10, and a display screen arranged coaxially or non-coaxially with the short-range optical amplifying module.
12. A helmet comprising a short-range optical amplification module according to any one of claims 1 to 10, further comprising a display screen arranged coaxially or non-coaxially with the short-range optical amplification module.
13. A VR system comprising the glasses of claim 11 or the helmet of claim 12.
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| CN110308559A (en) * | 2019-06-28 | 2019-10-08 | 上海视涯信息科技有限公司 | A kind of virtual reality optics module and virtual reality device |
| CN110515208A (en) * | 2019-08-22 | 2019-11-29 | 双莹科技股份有限公司 | short distance optics |
| CN110764266B (en) * | 2019-11-13 | 2022-07-22 | 歌尔光学科技有限公司 | Optical system and virtual reality equipment |
| CN111290132A (en) * | 2020-04-03 | 2020-06-16 | 江西微瑞光学有限公司 | Short-distance and high-lens-birefringence-tolerance optical imaging module |
| CN114690415A (en) * | 2020-12-29 | 2022-07-01 | 华为技术有限公司 | Optical module and electronic equipment |
| TWI797563B (en) * | 2021-02-23 | 2023-04-01 | 廣達電腦股份有限公司 | Ultra short distance eyepiece system |
| CN113467091A (en) * | 2021-06-29 | 2021-10-01 | 歌尔股份有限公司 | Near-eye display system and head-mounted display device |
| CN114675419B (en) * | 2022-03-16 | 2023-06-13 | 江西凤凰光学科技有限公司 | Near-to-eye type virtual reality optical module |
| CN114415381B (en) * | 2022-03-30 | 2022-07-22 | 南昌龙旗信息技术有限公司 | Optical imaging module and virtual reality equipment |
| TWI844025B (en) * | 2022-05-27 | 2024-06-01 | 大立光電股份有限公司 | Optical system and head-mounted device |
| CN114942489A (en) * | 2022-07-26 | 2022-08-26 | 歌尔光学科技有限公司 | Optical module and head-mounted display device |
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