Large-view-field lens for near-to-eye display immersive perception and near-to-eye display device

Abstract

The utility model discloses a large-field-of-view lens for near-to-eye display immersive perception. The large-field-of-view lens comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged from an object side surface to an image surface, wherein the first lens to the eighth lens are glass spherical lenses; the object side surfaces of the first lens, the third lens, the fourth lens, the fifth lens, the seventh lens and the eighth lens are convex surfaces, and the image side surfaces are concave surfaces; object side surfaces of the second lens and the sixth lens are concave surfaces, and image side surfaces of the second lens and the sixth lens are concave surfaces; the first lens, the second lens and the sixth lens all have negative focal power; the third lens, the fourth lens, the fifth lens, the seventh lens and the eighth lens all have positive focal power. The lens can realize high image quality and large-view-field-angle imaging with the view field angle larger than 160 degrees, and the lens is small in size, so that the requirement of a user for sensing a large-view-field environment is met.

Description

Technical Field

[0001] The utility model relates to the technical field of optical lenses, and in particular to a large field-of-view lens and a near-eye display device for immersive perception of near-eye display. Background Art

[0002] As a key support for emerging information technology and the digital economy, virtual reality and augmented reality technologies have attracted much attention in recent years. Whenever a new head-mounted display device is released, it will attract the attention of a large number of people inside and outside the industry. Among these devices, the lens plays a crucial role and directly affects the user's visual experience. In particular, a large field-of-view lens can provide a wide field of view, enhance environmental perception, and improve the user's immersion and visual enjoyment. However, current lenses cannot balance image quality and maintain a small size while pursuing a large field-of-view angle, and thus cannot meet the requirements of various application environments.

[0003] In view of this, the present utility model is specifically proposed. Summary of the Utility Model

[0004] The purpose of the present utility model is to provide a large field-of-view lens and a near-eye display device for immersive perception of near-eye display, which can achieve high image quality and large field-of-view imaging with a field-of-view angle greater than 160°, and the lens has a small size, thereby meeting the user's demand for large field-of-view environmental perception and solving the above technical problems existing in the prior art.

[0005] The purpose of the present utility model is achieved by the following technical solutions:

[0006] A large field-of-view lens for immersive perception of near-eye display, comprising: a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged in sequence from the object side to the image side; wherein,

[0007] The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are all glass spherical lenses;

[0008] The object sides of the first lens, the third lens, the fourth lens, the fifth lens, the seventh lens, and the eighth lens are all convex surfaces, and the image sides are all concave surfaces;

[0009] The object sides of the second lens and the sixth lens are both concave surfaces, and the image sides are both concave surfaces;

[0010] The first lens, the second lens, and the sixth lens all have negative optical powers;

[0011] The third lens, the fourth lens, the fifth lens, the seventh lens, and the eighth lens all have positive optical powers.

[0012] A near-eye display device includes: a device body and a lens disposed on the device body, and the lens is a large field-of-view lens for near-eye display immersive perception described in the present invention.

[0013] Compared with the prior art, the large field-of-view lens for near-eye display immersive perception and the near-eye display device provided by the present utility model have the following beneficial effects:

[0014] Through the reasonable cooperation of the focal lengths of each lens and the reasonable setting of the aperture position, while ensuring that the field-of-view angle of the large field-of-view lens has a large field-of-view angle with FOV≥160°, the aberration at a large field-of-view is corrected, the imaging quality is improved, a large-field image with high resolution is obtained, which can meet the user's requirements for ultra-wide-angle and high-resolution imaging, and the large field-of-view lens satisfies: 0.3<CA1 / TTL<0.6. Using multiple high-refractive-index glass lenses as each lens, it has the advantage of miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a schematic structural diagram of the large field-of-view lens for near-eye display immersive perception provided by the embodiment of the present utility model.

[0017] Figure 2 It is a relative illumination diagram of the large field-of-view lens for near-eye display immersive perception provided by the embodiment of the present utility model.

[0018] The marks in the figure are: 10 - first lens; 11 - second lens; 12 - third lens; 13 - aperture; 14 - fourth lens; 15 - fifth lens; 16 - sixth lens; 17 - seventh lens; 18 - eighth lens; 19 - object side; 20 - image plane. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model; obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments, which do not constitute a limitation to the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present utility model.

[0020] First, the terms that may be used in this article are described as follows:

[0021] The term "and / or" means that either or both of the two can be achieved. For example, X and / or Y means that it includes three cases: "X" or "Y", and "X and Y".

[0022] Descriptions with terms such as "include", "comprise", "contain", "have" or other similar semantics should be interpreted as non-exclusive inclusion. For example, including a certain technical feature element (such as raw material, component, ingredient, carrier, dosage form, material, size, part, component, mechanism, device, step, process, method, reaction condition, processing condition, parameter, algorithm, signal, data, product or article, etc.) should be interpreted as not only including the explicitly listed certain technical feature element, but also including other technical feature elements known to those skilled in the art that are not explicitly listed.

[0023] The term "consisting of" means excluding any technical feature element that is not explicitly listed. If this term is used in a claim, then this term will make the claim a closed type, making it not contain technical feature elements other than the explicitly listed ones, except for related conventional impurities. If this term only appears in a certain clause of a claim, then it only limits the elements explicitly listed in that clause, and the elements recorded in other clauses are not excluded from the overall claim.

[0024] Unless otherwise clearly specified or limited, terms such as "install", "connect", "join", "fix", etc. should be understood in a broad sense. For example: it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0025] When a concentration, temperature, pressure, size or other parameter is expressed in the form of a numerical range, this numerical range should be understood as specifically disclosing all ranges formed by the pairing of any upper limit value, lower limit value, and preferred value within this numerical range, regardless of whether this range is explicitly recorded; for example, if the numerical range "2 to 8" is recorded, then this numerical range should be interpreted as including ranges such as "2 to 7", "2 to 6", "5 to 7", "3 to 4 and 6 to 7", "3 to 5 and 7", "2 and 5 to 7", etc. Unless otherwise stated, the numerical ranges recorded in this article include both their end values and all integers and fractions within this numerical range.

[0026] The orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of description and simplification of the description, rather than explicitly or implicitly indicating that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this article.

[0027] The solution provided by the present utility model will be described in detail below. The content not described in detail in the embodiments of the present utility model belongs to the prior art well-known to those skilled in the art. For the conditions not specified in the embodiments of the present utility model, they are carried out according to the conventional conditions in the art or the conditions recommended by the manufacturer. For the reagents or instruments not specified in the embodiments of the present utility model for the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0028] As Figure 1 shown, an embodiment of the present utility model provides a large field-of-view lens for near-eye display immersive perception, including: a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged in sequence from the object side to the image side; wherein,

[0029] The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are all glass spherical lenses;

[0030] The object sides of the first lens, the third lens, the fourth lens, the fifth lens, the seventh lens, and the eighth lens are all convex surfaces, and the image sides are all concave surfaces;

[0031] The object sides of the second lens and the sixth lens are both concave surfaces, and the image sides are both concave surfaces;

[0032] The first lens, the second lens, and the sixth lens all have negative optical powers;

[0033] The third lens, the fourth lens, the fifth lens, the seventh lens, and the eighth lens all have positive optical powers.

[0034] Preferably, in the above large field-of-view lens,

[0035] The ratio of the focal length f1 of the first lens to the focal length f of the large field-of-view lens satisfies: 7.5 < |f1 / f| < 9;

[0036] The ratio of the focal length f2 of the second lens to the focal length f of the large field-of-view lens satisfies: 2 < |f2 / f| < 4;

[0037] The ratio of the focal length f3 of the third lens to the focal length f of the large field of view lens satisfies: 4.5 < |f3 / f| < 6.5;

[0038] The ratio of the focal length f4 of the fourth lens to the focal length f of the large field of view lens satisfies: 3 < |f4 / f| < 4.5;

[0039] The ratio of the focal length f5 of the fifth lens to the focal length f of the large field of view lens satisfies: 2.5 < |f5 / f| < 4;

[0040] The ratio of the focal length f6 of the sixth lens to the focal length f of the large field of view lens satisfies: 2 < |f6 / f| < 3.5;

[0041] The ratio of the focal length f7 of the seventh lens to the focal length f of the large field of view lens satisfies: 9 < |f7 / f| < 11;

[0042] The ratio of the focal length f8 of the eighth lens to the focal length f of the large field of view lens satisfies: 6 < |f8 / f| < 7.5;

[0043] The ratio of the sum of the focal lengths of the first lens, the second lens, and the third lens to the sum of the focal lengths of the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens satisfies: 12 < |(f1 + f2 + f3) / (f4 + f5 + f6 + f7 + f8)| < 14.

[0044] Preferably, in the above-mentioned large field of view lens, the ratio of the effective clear aperture CA1 of the object side surface of the first lens to the distance TTL from the object side surface of the first lens to the image plane satisfies: 0.3 < CA1 / TTL < 0.6.

[0045] Preferably, in the above-mentioned large field of view lens, among the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens, the number of lenses VP with a refractive index greater than 1.6 satisfies: VP ≥ 3.

[0046] Preferably, in the above-mentioned large field of view lens, the F number FNO of the large field of view lens satisfies: 1.9 < FNO < 3.0.

[0047] Preferably, in the above-mentioned large field of view lens, in the large field of view lens, the ratio of the sum GT of the central thicknesses of all lenses to the distance TTL from the object side surface of the first lens to the image plane satisfies: 0.5 < GT / TTL < 0.7.

[0048] Preferably, in the above-mentioned large field of view lens, the ratio of the distance L from the object side surface of the first lens to the diaphragm plane to the distance TTL from the object side surface of the first lens to the image plane is: L / TTL ≈ 0.6.

[0049] Preferably, in the above-mentioned large field of view lens, the relative illumination RI of the large field of view lens satisfies: RI > 60%.

[0050] Preferably, in the above-mentioned large field of view lens, the field of view angle FOV of the large field of view lens satisfies: FOV ≥ 160°.

[0051] An embodiment of the present invention also provides a near-eye display device, including: a device body and a lens disposed on the device body, and the lens adopts the above-mentioned large field of view lens for immersive perception of near-eye display.

[0052] In summary, the large field of view lens of the embodiment of the present utility model, through the reasonable cooperation of the focal lengths of each lens and the reasonable setting of the aperture position, while ensuring that the field of view angle of the large field of view lens has a large field of view angle of FOV ≥ 160°, corrects the aberration at a relatively large field of view, improves the imaging quality, obtains a large field of view image with high resolution, can meet the user's requirements for ultra-wide angle and high-resolution imaging, and the large field of view lens satisfies: 0.3 < CA1 / TTL < 0.6. Using multiple high-refractive-index glass lenses as each lens has the advantage of miniaturization.

[0053] In order to more clearly show the technical solutions provided by the present utility model and the technical effects produced, the following uses specific embodiments to describe in detail the solutions provided by the embodiments of the present utility model.

[0054] Embodiment 1

[0055] As Figure 1 、 Figure 2 shown, this embodiment provides a large field of view lens for immersive perception of near-eye display. This large field of view lens can achieve high-image-quality and large-field-of-view-angle imaging, with a field of view angle greater than 160°, meeting the user's demand for large-field-of-view environment perception; by using high-refractive-index glass materials to reduce the system volume, the miniaturization of the lens is realized, including: a first lens 10, a second lens 11, a third lens 12, an aperture 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, a seventh lens 17, and an eighth lens 18 arranged in sequence from the object side 19 to the image side 20; wherein, the first lens 10 has a negative optical power, the second lens 11 has a negative optical power, the third lens 12 has a positive optical power, the fourth lens 14 has a positive optical power, the fifth lens 15 has a positive optical power, the sixth lens 16 has a negative optical power, the seventh lens 17 has a positive optical power, and the eighth lens 18 has a positive optical power. All the lenses are glass spherical lenses.

[0056] The object side of the first lens 10 is convex, and the image side is concave; the object side of the second lens 11 is concave, and the image side is concave; the object side of the third lens 12 is convex, and the image side is convex; the object side of the fourth lens 14 is convex, and the image side is convex; the object side of the fifth lens 15 is convex, and the image side is convex; the object side of the sixth lens 16 is concave, and the image side is concave; the object side of the seventh lens 17 is convex, and the image side is concave; the object side of the eighth lens 18 is convex, and the image side is concave.

[0057] Preferably, each lens of the above large field of view lens satisfies the following conditional expressions: 7.5 < |f1 / f| < 9, 2 < |f2 / f| < 4, 4.5 < |f3 / f| < 6.5, 3 < |f4 / f| < 4.5, 2.5 < |f5 / f| < 4, 2 < |f6 / f| < 3.5, 9 < |f7 / f| < 11, 6 < |f8 / f| < 7.5, 12 < |(f1 + f2 + f3) / (f4 + f5 + f6 + f7 + f8)| < 14, where f1 represents the focal length of the first lens 10, f2 represents the focal length of the second lens 111, f3 represents the focal length of the third lens 12, f4 represents the focal length of the fourth lens 14, f5 represents the focal length of the fifth lens 15, f6 represents the focal length of the sixth lens 16, f7 represents the focal length of the seventh lens 17, f8 represents the focal length of the eighth lens 18, and f represents the focal length of the large field of view lens. Through the reasonable coordination of the focal lengths of each lens, it can ensure that the lens has a larger field of view, higher imaging quality and temperature characteristics.

[0058] Preferably, the large field of view lens satisfies the following conditional expression: 0.3 < CA1 / TTL < 0.6, where CA1 represents the effective clear aperture of the object side of the first lens 10, and TTL represents the distance from the object side of the first lens 10 of the large field of view lens to the image plane. This limitation makes the large field of view lens have the characteristics of small aperture and small volume, which is convenient for realizing the miniaturization of the device.

[0059] Preferably, the large field of view lens satisfies the following conditional expression: FOV ≥ 160°, where FOV represents the field of view angle of the large field of view lens. This limitation makes the large field of view lens have a larger field of view angle, which can meet the high requirements of the device for environmental perception.

[0060] Preferably, the large field of view lens satisfies the following conditional expression: VP ≥ 3, where VP represents the number of glass lenses in the large field of view lens with a refractive index greater than 1.6. This limitation makes the total length of the large field of view lens not too long, which is convenient for realizing the miniaturization of the device and better meeting the usage needs of users.

[0061] Preferably, the large field of view lens satisfies the following conditional formula: 1.9 < FNO < 3.0, where FNO represents the F-number of the large field of view lens. This limitation enables the large field of view lens to obtain a light transmission amount matching the size of the imaging surface, improving the imaging clarity.

[0062] Preferably, the large field of view lens satisfies the following conditional formula: 0.5 < GT / TTL < 0.7, where GT represents the sum of the central thicknesses of all the lenses in the large field of view lens, and TTL represents the distance from the object side surface of the first lens 10 to the imaging surface. This limitation can make the structure of the large field of view lens more compact, facilitating the shortening of the overall length, and can also make the lenses bend better to correct aberrations, enhancing the imaging quality.

[0063] Preferably, the large field of view lens satisfies the following conditional formula: L / TTL ≈ 0.6, where L represents the distance from the object side surface of the first lens 10 of the large field of view lens to the aperture surface, and TTL represents the distance from the object side surface of the first lens 10 of the large field of view lens to the imaging surface. Through the reasonable setting of the aperture, it can ensure that the system has the imaging characteristics of high resolution and large field of view.

[0064] Preferably, the large field of view lens satisfies the following conditional formula: RI > 60%, where RI represents the relative illumination. This limitation can ensure that there will not be too much noise in the subsequent algorithm processing of the image, enhancing the imaging quality.

[0065] The relevant parameters of each lens in the large field of view lens of this embodiment are shown in Table 1.

[0066] Table 1 shows the relevant parameters of each lens in the large field of view lens

[0067]

[0068]

[0069] The focal length f of the large field of view lens of this embodiment is 1.41 mm, FNO = 2.78, the overall length TOTR of the large field of view lens is 22.04 mm, and the field of view angle is 160°. Table 2 shows the conditional calculation results.

[0070] Table 2 shows the conditional calculation results

[0071] conditional actual FOV ≥ 160° 160° <![CDATA[0.3 < CA1 / TTL < 0.6]]> 0.45 VP ≥ 3 4 1.9 < FNO < 3.0 2.78 0.5 < GT / TTL < 0.7 0.63 L / TTL ≈ 0.6 0.61 RI > 60% >74％ <![CDATA[7.5 < |f1 / f| < 9]]> 8.43 <![CDATA[2 < |f2 / f| < 4]]> 3.09 <![CDATA[4.5 < |f3 / f| < 6.5]]> 5.33 <![CDATA[3 < |f4 / f| < 4.5]]> 3.51 <![CDATA[2.5 < |f5 / f| < 4]]> 3.36 <![CDATA[2 < |f6 / f| < 3.5]]> 2.32 <![CDATA[9 < |f7 / f| < 11]]> 10.53 <![CDATA[6 < |f8 / f| < 7.5]]> 6.93 <![CDATA[12 < |(f1 + f2 + f3) / (f4 + f5 + f6 + f7 + f8)| < 14]]> 13.00

[0072] In this embodiment, by using a glass material with a high refractive index as the lens, the overall volume of the large field of view lens is reduced, miniaturization is achieved, and the volume of the near-eye display device is further reduced.

[0073] As described above, it is only the preferred specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims. The information disclosed in the background art part of this article is only intended to deepen the understanding of the overall background technology of the present utility model, and should not be regarded as an admission or an indication in any form that this information constitutes the prior art known to those skilled in the art.

Claims

1. A large field of view lens for immersive perception of near-eye display, characterized in that, Including: A first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged in sequence from the object side to the image side; wherein, The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are all glass spherical lenses; The object sides of the first lens, the third lens, the fourth lens, the fifth lens, the seventh lens, and the eighth lens are all convex, and the image sides are all concave; The object sides of the second lens and the sixth lens are both concave, and the image sides are both concave; The first lens, the second lens, and the sixth lens all have negative focal powers; The third lens, the fourth lens, the fifth lens, the seventh lens, and the eighth lens all have positive focal powers.

2. The large field of view lens for near-eye display immersive perception according to claim 1, wherein The ratio of the focal length f1 of the first lens to the focal length f of the large field of view lens satisfies: 7.5 < |f1 / f| < 9; The ratio of the focal length f2 of the second lens to the focal length f of the large field of view lens satisfies: 2 < |f2 / f| < 4; The ratio of the focal length f3 of the third lens to the focal length f of the large field of view lens satisfies: 4.5 < |f3 / f| < 6.5; The ratio of the focal length f4 of the fourth lens to the focal length f of the large field of view lens satisfies: 3 < |f4 / f| < 4.5; The ratio of the focal length f5 of the fifth lens to the focal length f of the large field of view lens satisfies: 2.5 < |f5 / f| < 4; The ratio of the focal length f6 of the sixth lens to the focal length f of the large field of view lens satisfies: 2 < |f6 / f| < 3.5; The ratio of the focal length f7 of the seventh lens to the focal length f of the large field of view lens satisfies: 9 < |f7 / f| < 11; The ratio of the focal length f8 of the eighth lens to the focal length f of the large field of view lens satisfies: 6 < |f8 / f| < 7.5; The ratio of the sum of the focal lengths of the first lens, the second lens, and the third lens to the sum of the focal lengths of the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens satisfies: 12 < |(f1 + f2 + f3) / (f4 + f5 + f6 + f7 + f8)| < 14.

3. The large field of view lens for near-eye display immersive perception according to claim 1 or 2, characterized in that, The ratio of the effective clear aperture CA1 of the object side of the first lens to the distance TTL from the object side of the first lens to the image side satisfies: 0.3 < CA1 / TTL < 0.

6.

4. The large field of view lens for near-eye display immersive perception according to claim 1 or 2, characterized in that, Among the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens, the number of lenses VP with a refractive index greater than 1.6 satisfies: VP ≥ 3.

5. The large field of view lens for near-eye display immersive perception according to claim 1 or 2, characterized in that, The F number FNO of the large field of view lens satisfies: 1.9 < FNO < 3.

0.

6. The large field of view lens for near-eye display immersive perception according to claim 1 or 2, characterized in that, The ratio of the sum GT of the central thicknesses of all lenses to the distance TTL from the object side of the first lens to the image side satisfies: 0.5 < GT / TTL < 0.

7.

7. The large field-of-view lens for near-eye display immersive perception according to claim 1 or 2, characterized in that, The ratio of the distance L from the object side of the first lens to the diaphragm surface to the distance TTL from the object side of the first lens to the image side is: L / TTL ≈ 0.

6.

8. The large field-of-view lens for near-eye display immersive perception according to claim 1 or 2, characterized in that, The relative illumination RI of the large field of view lens satisfies: RI > 60%.

9. The large field of view lens for near-eye display immersive perception according to claim 1 or 2, characterized in that, The field of view FOV of the large field of view lens satisfies: FOV ≥ 160°.

10. A near-eye display device, comprising: The device body and the lens disposed on the device body, characterized in that the lens is a large field of view lens for near-eye display immersive perception described in any one of claims 1-9.

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