Ultra-short-focus projection objective lens, optical system and equipment

Abstract

The utility model discloses an ultra-short-focus projection objective lens, and the objective lens comprises a first refraction lens group; a second refraction lens group; the first reflecting part is located between the first refracting lens group and the second refracting lens group and reflects emergent light of the first refracting lens group to the second refracting lens group; and the reflection part II reflects the emergent light of the refraction lens group II. The optical axes of the first refraction lens set and the second refraction lens set form a certain included angle. And the lenses in the refraction lens group I are plane lenses, spherical lenses and aspherical lenses. And the lenses in the refraction lens group II are spherical lenses and aspherical lenses. The ultra-short-focus projection optical system comprises the ultra-short-focus projection objective lens. The ultra-short-focus projection equipment comprises the ultra-short-focus projection optical system. The utility model relates to an ultra-short-focus projection objective lens, an optical system and equipment, which are favorable for reducing the size of desktop projection display equipment and enabling the equipment to develop towards the miniaturization direction.

Description

Technical Field

[0001] The utility model belongs to the field of optical technology, and particularly relates to an ultra-short focus projection objective lens, an optical system and equipment. Background Art

[0002] Ultra-short-throw projection technology is a new type of projection technology that has emerged in recent years. It can break through the limitations of the spatial environment, realize large-screen projection at an ultra-short projection distance, and maintain excellent imaging quality. At present, products with ultra-short-throw projection technology are divided into two categories. One is represented by home theaters, which can realize the projection of ultra-large screens within an ultra-short distance. For example, many laser TV products can project a large screen of about 100 inches within a range of 30 cm from the screen. The other is represented by desktop interactive devices, for example, it can project a screen size of about 30 inches within a range of 10 cm from the desktop.

[0003] At present, the entire ultra-short-throw optical system structure of desktop interactive devices is relatively long, resulting in a relatively high height of the instrument. For example, in the ultra-short-throw projection optical path structure shown in Chinese patents CN114924457, CN107144944 and CN217521432, all lenses and reflectors in the optical path are in the same direction, resulting in a long one-way optical path, which is not conducive to the miniaturization of desktop interactive devices. For example, in Chinese patents CN109491060, Chinese patents CN109870791 and US patents US10067324, the reflectors and lenses in the optical path are not in the same direction, which reduces the length of the one-way optical path to a certain extent, but all lenses are still in the same direction, and the one-way optical path is still relatively long, resulting in the inability of desktop interactive devices to reduce their size in both height and length directions at the same time. Summary of the invention

[0004] The utility model provides an ultra-short-focus projection objective lens, an optical system and equipment, which are conducive to the development of desktop projection equipment in the direction of miniaturization.

[0005] One of the embodiments of the utility model is an ultra-short focus projection objective lens, comprising: a refractive lens group 1; a refractive lens group 2; a reflective component 1, located between the refractive lens group 1 and the refractive lens group 2, reflecting the outgoing light of the refractive lens group 1 to the refractive lens group 2; and a reflective component 2, reflecting the outgoing light of the refractive lens group 2.

[0006] Preferably, the refractive lens set 1 comprises at least one lens.

[0007] Preferably, the second refractive lens group includes at least one lens.

[0008] Preferably, the optical axes of the refractive lens group 1 and the refractive lens group 2 form an angle ranging from 45° to 135°.

[0009] Preferably, the first reflective component is a reflective mirror or a reflective prism, and the reflective surface is a plane or a non-plane.

[0010] Preferably, the lenses in the refractive lens group 1 are plane lenses, spherical lenses and aspherical lenses.

[0011] Preferably, the lenses in the refractive lens group 2 are spherical lenses and aspherical lenses.

[0012] Preferably, the second reflecting component is an aspherical reflecting mirror.

[0013] An ultra-short-throw projection optical system comprises the ultra-short-throw projection objective lens, a projection display chip, and a light source.

[0014] An ultra-short-throw projection device comprises the ultra-short-throw projection optical system mentioned above, and peripheral circuits and structural parts.

[0015] The utility model adopts a special design to divide the optical lens of the projection objective lens into two parts through a reflective component, and the two parts are at a certain angle, so that the dimensions in two directions, namely the height and the length, can be reduced at the same time, which is conducive to the development of the desktop projector towards miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present utility model will become easily understood. In the accompanying drawings, several embodiments of the present utility model are shown in an exemplary and non-limiting manner.

[0017] Figure 1 It is a schematic diagram of the structure of an ultra-short-focus projection objective lens according to one embodiment of the utility model.

[0018] Figure 2 It is a structural schematic diagram of a refractive lens set 1 according to one embodiment of the utility model.

[0019] Figure 3 It is a structural schematic diagram of a refractive lens group 2 according to one embodiment of the utility model.

[0020] Figure 4 It is a schematic diagram of the structure of an ultra-short-focus projection objective lens according to one embodiment of the utility model.

[0021] Figure 5 It is a structural schematic diagram of a refractive lens group three according to one embodiment of the utility model.

[0022] Figure 6 It is a structural schematic diagram of a refractive lens group four according to one embodiment of the utility model.

[0023] Figure 7It is a schematic diagram of the structure of an ultra-short-focus projection objective lens according to one embodiment of the utility model. DETAILED DESCRIPTION

[0024] According to one or more embodiments, Figure 1 As shown, an ultra-short-focus projection objective lens comprises: a refractive lens group 1; a refractive lens group 2; a reflective component 3, located between the refractive lens group 1 and the refractive lens group 2, reflecting the outgoing light of the refractive lens group 1 to the refractive lens group 2; and a reflective component 2 4, reflecting the outgoing light of the refractive lens group 2.

[0025] like Figure 2 As shown, the refractive lens group 1 includes nine lenses, lens 1-1, lens 1-2, and lens 1-3 are plane lenses, lens 1-4 is an aspherical lens, and lenses 1-5, lens 1-6, lens 1-7, lens 1-8, and lens 1-9 are spherical lenses. The materials of lens 1-1 and lens 1-2 are H-K9L, the material of lens 1-3 is H-ZF52, the material of lens 1-4 is D-K9, the material of lens 1-5 is H-FK61, the material of lens 1-6 is H-ZF7LA, the material of lens 1-7 is H-FK61, the material of lens 1-8 is H-ZLAF1, and the material of lens 1-9 is H-ZF11. Figure 3 As shown, the refractive lens group 2 includes 4 lenses, lens 2-1, lens 2-2, and lens 2-3 are spherical lenses, and lens 2-4 is an aspherical lens. The material of lens 2-1 is H-K9L, the material of lens 2-2 is H-ZK5, the material of lens 2-3 is H-ZF13, and the material of lens 2-4 is ZEONEX_350R_2016. The optical axes of the refractive lens group 1 and the refractive lens group 2 are at an angle of 90°. The reflective component 13 is a reflector, and the reflective surface 3-1 is a plane, which is used to reflect the light emitted from the lens group 1 to the lens group 2. The reflective component 24 is an aspherical reflector, which is used to reflect the light to the desktop.

[0026] The surface parameters, lens thickness, lens spacing and materials of each lens are shown in Table 1 and Table 2 (Table 2 shows the aspheric coefficients of lens 1-4, lens 2-4 and reflector 2-4). Among them, sufficient space needs to be reserved between lens 1-9 and lens 2-1 during design to ensure that reflective component 1-3 can be placed between lens 1-9 and lens 2-1. In this embodiment, the distance between lens 1-8 and lens 2-1 is 31.429 mm.

[0027] Table 1

[0028]

[0029]

[0030] Table 2

[0031]

[0032]

[0033] According to one or more embodiments, Figure 4 As shown, an ultra-short-focus projection objective lens. The projection objective lens comprises: a refractive lens group 1 5; a refractive lens group 2 6; a reflective component 1 7, located between the refractive lens group 1 5 and the refractive lens group 2 6, reflecting the outgoing light of the refractive lens group 1 7 to the refractive lens group 2 6; and a reflective component 2 8, reflecting the outgoing light of the refractive lens group 2 6.

[0034] like Figure 5 As shown, the refractive lens group 1 5 includes nine lenses, lens 5-1, lens 5-2, and lens 5-3 are plane lenses, lens 5-4 is an aspherical lens, and lens 5-5, lens 5-6, lens 5-7, lens 5-8, and lens 5-9 are spherical lenses. The materials of lens 5-1 and lens 5-2 are H-K9L, the material of lens 5-3 is H-ZF52, the material of lens 5-4 is D-K9, the material of lens 5-5 is H-FK61, the material of lens 5-6 is H-ZF7LA, the material of lens 5-7 is H-FK61, the material of lens 5-8 is H-ZLAF1, and the material of lens 5-9 is H-ZF11. Figure 6 As shown, the refractive lens group 2 6 includes 4 lenses, lenses 6-1, 6-2, and 6-3 are spherical lenses, and lens 6-4 is an aspherical lens. The material of lens 6-1 is H-K9L, the material of lens 6-2 is H-ZK5, the material of lens 6-3 is H-ZF13, and the material of lens 6-4 is ZEONEX_350R_2016. The optical axes of the refractive lens group 1 5 and the refractive lens group 2 6 form an angle, and the angle between the two is 90°. The reflective component 1 7 is a reflector, and the reflective surface 7-1 is a non-plane, which is used to reflect the light emitted from the lens group 1 5 to the lens group 2 6, with a curvature radius of 1.661E+04, a conic quadratic coefficient k of -1.042, an aspheric quadratic coefficient a1 of 0, an aspheric quartic coefficient a2 of -1.296E-09, an aspheric sextant coefficient a3 of -6.454E-12, and an aspheric octant coefficient a4 of -2.444E-14. The reflective component 2 8 is an aspheric reflector, which is used to reflect light to the desktop.

[0035] The surface parameters, lens thickness, lens spacing and materials of each lens are shown in Table 3 and Table 4 (Table 4 shows the aspheric coefficients of lens 5-4, lens 6-4 and reflector 2-8). Among them, sufficient space needs to be reserved between lens 5-9 and lens 6-1 during design to ensure that reflective component 1-3 can be placed between lens 5-9 and lens 6-1. In this embodiment, the distance between lens 1-8 and lens 2-1 is 31.429 mm.

[0036] Table 3

[0037]

[0038]

[0039] Table 4

[0040]

[0041] According to one or more embodiments, Figure 7 As shown, an ultra-short-focus projection objective lens. The projection objective lens comprises: a refractive lens group 1; a refractive lens group 2; a reflective component 9, located between the refractive lens group 1 and the refractive lens group 2, reflecting the outgoing light of the refractive lens group 9 to the refractive lens group 2; and a reflective component 24, reflecting the outgoing light of the refractive lens group 2. Different from the above-mentioned embodiment, the reflective component 9 is a reflective prism, and the reflective surface 9-1 is a plane or a non-plane.

[0042] An ultra-short-throw projection optical system comprises the ultra-short-throw projection objective lens, a projection display chip and a light source.

[0043] An ultra-short-throw projection device comprises the ultra-short-throw projection optical system mentioned above, and peripheral circuits and structural parts.

[0044] It is worth noting that, although the foregoing content has described the spirit and principle of the invention with reference to several specific embodiments, it should be understood that the invention is not limited to the disclosed specific embodiments, and the division of various aspects does not mean that the features in these aspects cannot be combined, and such division is only for the convenience of expression. The invention is intended to cover various modifications and equivalent arrangements included in the spirit and scope of the appended claims.

Claims

1. An ultra-short-throw projection objective lens, characterized in that: include: Refractive lens group 1; Refractive lens group 2; A reflective component 1, located between the refractive lens group 1 and the refractive lens group 2, and reflecting the outgoing light of the refractive lens group 1 to the refractive lens group 2; The second reflective component reflects the outgoing light of the second refractive lens group.

2. The ultra-short focus projection objective lens according to claim 1, characterized in that: The refractive lens set 1 includes at least one lens.

3. The ultra-short focus projection objective lens according to claim 1, characterized in that: The second refractive lens group includes at least one lens.

4. The ultra-short focus projection objective lens according to claim 1, characterized in that: The optical axes of the refractive lens group 1 and the refractive lens group 2 form an angle ranging from 45° to 135°.

5. The ultra-short focus projection objective lens according to claim 1, characterized in that: The first reflecting component is a reflecting mirror or a reflecting prism, and the reflecting surface is a plane or a non-plane.

6. The ultra-short focus projection objective lens according to claim 1, characterized in that: The lenses of the refractive lens group 1 are plane lenses, spherical lenses and aspherical lenses.

7. The ultra-short focus projection objective lens according to claim 1, characterized in that: The lenses in the refractive lens group 2 are spherical lenses and aspherical lenses.

8. The ultra-short focus projection objective lens according to claim 1, characterized in that: The second reflecting component is an aspherical reflecting mirror.

9. An ultra-short-throw projection optical system, comprising the ultra-short-throw projection objective lens according to any one of claims 2 to 8, and Projection display chips and light sources.

10. An ultra-short-throw projection device, comprising the ultra-short-throw projection optical system according to claim 9, and peripheral circuits and structural parts.

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