Fixed-focus projection lens

Abstract

The utility model discloses a fixed-focus projection lens, which comprises a lens shell, an operation ring is arranged on the outer side of the lens shell, and an inner clamping groove is formed in the inner side of the lens shell; a first lens, a second lens, a first spacer ring, a third lens, a second spacer ring, a fourth lens and a fifth lens are sequentially mounted from one end to the other end of the inner side of the inner clamping groove in a clamping manner, a first gasket is arranged between the first lens and the second gasket of the second lens, and a second gasket is arranged between the second lens and the first spacer ring; one side of the third lens is attached to one end of the supporting cylinder, and the other end of the supporting cylinder is attached to one side of the fourth lens. According to the fixed-focus projection lens, the novel structural design is adopted, different lenses can be stably installed, the adjacent lenses can be isolated, protected and positioned, friction loss of the lenses in the using process is avoided, it is guaranteed that the different lenses are accurately aligned, and the projection effect of the fixed-focus projection lens is kept stable for a long time.

Description

Technical Field

[0001] The utility model relates to the technical field of projection lenses, in particular to a fixed-focus projection lens. Background Art

[0002] Projection equipment is also called projection equipment. The most common projection equipment is the projector. The projector needs to use different lenses when projecting images in different environments. The fixed-focus lens is one of the lenses frequently used by projectors. It has the advantages of fast focusing speed and stable imaging quality. The image projected using the fixed-focus lens is clear and stable, the focus is very accurate, the picture is delicate, the graininess is very slight, and the metering is relatively accurate.

[0003] As the existing fixed-focus projection lens design is much simpler than the zoom projection lens, and uses fewer lenses, the lenses are usually directly snapped into the lens housing, and the lenses fit tightly together. Generally, the lenses will not be damaged by collision. However, during long-term use, the vibration during storage and carrying and transfer will cause friction loss at the lens joint, causing a slight misalignment of adjacent lenses, affecting the clarity of image projection. In response to the above problems, an innovative design is carried out based on the original fixed-focus projection lens. Utility Model Content

[0004] The utility model aims to provide a fixed-focus projection lens to solve the problem that the existing fixed-focus projection lens proposed in the above background technology is much simpler in design than the zoom projection lens, uses a small number of lenses, and is generally directly snap-fitted and installed in the lens housing. The lenses are tightly fitted and positioned, and the lenses are generally not damaged by collision. However, during long-term use, vibrations during storage and carrying and transfer may cause friction loss at the lens fitting, causing slight misalignment of adjacent lenses, thereby affecting the clarity of image projection.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a fixed-focus projection lens, characterized in that: it includes a lens housing, one end of the outer wall of the lens housing is provided with an external thread connected to the projector, one end of the inner side of the lens housing is provided with a photosensitive component, the other end of the inner side of the lens housing is provided with an inner slot for installing the lens component, and the lens component is directly opposite to the photosensitive component; the lens component includes a first lens, a second lens, a first spacer ring, a third lens, a second spacer ring, a fourth lens and a fifth lens which are sequentially engaged in the inner slot from the inside to the outside, a first gasket is provided between the first lens and the second gasket of the second lens, and a second gasket is provided between the second lens and the first spacer ring; one side of the third lens is in contact with one end of the support tube, the other end of the support tube is in contact with one side of the fourth lens, and a third gasket is provided between the other side of the fourth lens and the fifth lens.

[0006] The above-mentioned fixed-focus projection lens is characterized in that an operating ring is sleeved on the outer side of the lens housing, the outer side surface of the operating ring is set to be a matte surface, and the operating ring is set in the middle of the outer wall of the lens housing.

[0007] The above-mentioned fixed-focus projection lens is characterized in that the inner side surfaces of the first spacer ring and the second spacer ring are both arranged as inclined surfaces, and the thickness of the first spacer ring and the second spacer ring are both greater than the thickness of the center of the third lens.

[0008] The above-mentioned fixed-focus projection lens is characterized in that one side of the fifth lens is in contact with one side of the positioning ring, and the other side of the positioning ring is in contact with the sealing rubber ring, and the sealing rubber ring is fixedly installed at the end of the inner wall of the inner card slot.

[0009] The above-mentioned fixed-focus projection lens is characterized in that the positioning ring is connected to the inner groove by snapping, and the inner diameter of the positioning ring is smaller than the inner diameter of the sealing rubber ring.

[0010] The above-mentioned fixed-focus projection lens is characterized in that the first gasket, the second gasket and the third gasket are all annular structures made of silicone material, and the first gasket, the second gasket and the third gasket are distributed parallel to each other.

[0011] The above-mentioned fixed-focus projection lens is characterized in that the overall projection ratio of the first lens, the second lens, the third lens, the fourth lens and the fifth lens is 1.5:1 to 2:1.

[0012] The above-mentioned fixed-focus projection lens is characterized in that: the first lens is a 1 / 4 spherical glass spherical lens, the second lens and the third lens are both glass plano-concave lenses, and the fourth lens and the fifth lens are both glass meniscus lenses.

[0013] The above-mentioned fixed-focus projection lens is characterized in that the curvature direction of the upper curved surfaces of the second lens and the third lens is opposite to the curvature direction of the upper curved surfaces of the fourth lens and the fifth lens.

[0014] The above-mentioned fixed-focus projection lens is characterized in that: the first spacer ring is detachably connected by a plurality of spacer rings; the support tube includes a bottom plate, a top plate, and a spring for connecting the bottom plate and the top plate.

[0015] The fixed-focus projection lens of the utility model has the following beneficial effects:

[0016] 1. Different lenses are stably mounted through the inner card slot, and all lenses and isolation protection structures installed in the inner card slot are stably positioned as a whole through the narrow opening at one end of the inner card slot in conjunction with the positioning ring and the sealing rubber ring;

[0017] 2. The first lens, the second lens, the third lens, the fourth lens and the fifth lens are independently installed by the cooperation of the first spacer ring, the second spacer ring, the first gasket, the second gasket, the support tube and the third gasket to avoid friction loss between adjacent lenses, and to support and position adjacent lenses to ensure long-term stable operation of all lenses.

[0018] In summary, the utility model can not only stably install different lenses, but also isolate, protect and position adjacent lenses, avoid friction loss of lenses during use, ensure accurate alignment of different lenses, and keep the projection effect of fixed-focus projection lenses stable for a long time; BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the front view structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the front cross-sectional structure of the utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the first gasket of the utility model;

[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of the support tube of the utility model.

[0024]

Main component symbol description

[0025] 1. Lens housing; 2. Operating ring; 3. External thread; 4. Internal slot; 5. First lens; 6. Second lens; 7. First spacer ring; 8. Third lens; 9. Second spacer ring; 10. Fourth lens; 11. Fifth lens; 12. Positioning ring; 13. Sealing rubber ring; 14. First gasket; 15. Second gasket; 16. Support tube; 17. Third gasket. DETAILED DESCRIPTION

[0026] The fixed-focus projection lens of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments of the present invention.

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0031] like Figure 1-4As shown, the utility model provides a technical solution: a fixed-focus projection lens, comprising a lens housing 1, one end of the outer wall of the lens housing 1 is provided with an external thread 3 connected to the projector, one end of the inner side of the lens housing 1 is provided with a photosensitive component, the other end of the inner side of the lens housing 1 is provided with an inner card slot 4 for installing the lens component, and the lens component is directly opposite to the photosensitive component; the lens component comprises a first lens 5, a second lens 6, a first spacer ring 7, a third lens 8, a second spacer ring 9, a fourth lens 10 and a fifth lens 11 which are sequentially engaged on the inner card slot 4 from the inside to the outside, a first gasket 14 is arranged between the first lens 5 and the second gasket 15 of the second lens 6, and a second gasket 15 is arranged between the second lens 6 and the first spacer ring 7; one side of the third lens 8 is bonded to one end of a support tube 16, the other end of the support tube 16 is bonded to one side of the fourth lens 10, and a third gasket 17 is arranged between the other side of the fourth lens 10 and the fifth lens 11.

[0032] In actual use, the first spacer ring 7, the second spacer ring 9 and the support tube 16 cooperate with each other to ensure that the distance between the second lens 6 and the third lens 8, as well as the third lens 8 and the fourth lens 10 is fixed, and they will not be damaged by friction with each other. In conjunction with the first gasket 14, the second gasket 15 and the third gasket 17, friction damage will not occur between the first lens 5 and the second lens 6, the second lens 6 and the first spacer ring 7, and the fourth lens 10 and the fifth lens 11, thereby ensuring that all lenses can work stably for a long time.

[0033] In this embodiment, the first gasket 14, the second gasket 15 and the third gasket 17 are all annular structures made of silicone material, and the first gasket 14, the second gasket 15 and the third gasket 17 are arranged parallel to each other. The first gasket 14, the second gasket 15 and the third gasket 17 can protect the edge of the adjacent lens attached thereto to prevent the edge of the lens from being damaged by friction during long-term use.

[0034] It should be noted that the lens includes a lens housing 1, a photosensitive component disposed inside the lens housing 1, and a lens disposed on the housing facing the photosensitive component.

[0035] It should be noted that, the "inside" in "from inside to outside" refers to the end close to the photosensitive component; and the "outside" in "from inside to outside" refers to the end far from the photosensitive component.

[0036] In this embodiment, the lens assembly includes a first lens 5, a second lens 6, a third lens 8, a fourth lens 10 and a fifth lens 11 which are sequentially engaged on the inner slot 4 from the inside to the outside. The five lenses can be disassembled and assembled according to usage requirements to achieve different projection methods.

[0037] In this embodiment, an operating ring 2 is sleeved on the outer side of the lens housing 1 , and the outer side surface of the operating ring 2 is set to be a matte surface. The operating ring 2 is set in the middle of the outer wall of the lens housing 1 .

[0038] In actual use, the operating ring 2 is fixedly connected to the lens housing 1. The matte surface of the operating ring 2 makes it possible to have a large friction force and prevent slipping when the operating ring 2 is held by hand. By rotating the operating ring 2, the lens housing 1 can be driven to rotate, thereby driving the external thread 3 provided on the outer wall of the lens housing 1 to rotate, thereby realizing the connection or separation of the lens housing 1 and the projector.

[0039] In this embodiment, the inner side surfaces of the first spacer ring 7 and the second spacer ring 9 are both configured as inclined surfaces, and the thickness of the first spacer ring 7 and the second spacer ring 9 is greater than the thickness of the center of the third lens 8. In actual use, the above design allows light to pass through the lens assembly without obstruction.

[0040] In this embodiment, one side of the fifth lens 11 is in contact with one side of the positioning ring 12 , and the other side of the positioning ring 12 is in contact with the sealing rubber ring 13 . The sealing rubber ring 13 is fixedly mounted on the inner wall end of the inner card slot 4 .

[0041] In actual use, the sealing rubber ring 13 can prevent dust from entering the inner card slot 4 from the projector lens installation hole, and the sealing rubber ring 13 uses its own elasticity to squeeze and position the positioning ring 12 to assist in positioning the fifth lens 11.

[0042] In actual use, the above structural design enables the positioning ring 12 to be stably installed and to limit and fix the fifth lens 11. In this example, one side of the fifth lens 11 is in contact with one side of the positioning ring 12, and the other side of the positioning ring 12 is in contact with the sealing rubber ring 13, which is fixedly installed at the end of the inner wall of the inner card slot 4. The above structural design enables the sealing rubber ring 13 to lock the position of the positioning ring 12 while achieving a sealing and dustproof effect, so that the positioning ring 12 can stably squeeze and position the fifth lens 11.

[0043] In this embodiment, the positioning ring 12 is snap-fitted to the inner slot 4 , and the inner diameter of the positioning ring 12 is smaller than the inner diameter of the sealing rubber ring 13 .

[0044] In this embodiment, the overall projection ratio of the first lens 5, the second lens 6, the third lens 8, the fourth lens 10 and the fifth lens 11 is 1.5:1 to 2:1.

[0045] In this embodiment, the first lens 5 is a 1 / 4 spherical glass spherical lens, the second lens 6 and the third lens 8 are both glass plano-concave lenses, and the fourth lens 10 and the fifth lens 11 are both glass meniscus lenses.

[0046] In actual use, the above structural design ensures that within a fixed projection distance, the proportion of the projection picture of the first lens 5, the second lens 6, the third lens 8, the fourth lens 10 and the fifth lens 11, and the first lens 5 has the function of uniformly converging and diverging light, and has the ability to form an image, thereby ensuring the clarity of the projected image. The focal lengths of the second lens 6 and the third lens 8 are negative values, which are used to expand the focal length of the light passing through the fourth lens 10 and the fifth lens 11 in the middle, and the convex surfaces of the fourth lens 10 and the fifth lens 11 face the light source, and are positive meniscus lenses, which facilitate the light to pass through to obtain the minimum convergent light spot. They are used in combination with each other to effectively reduce the focal length and increase the numerical aperture.

[0047] In this embodiment, the curvature direction of the upper curved surfaces of the second lens 6 and the third lens 8 is opposite to the curvature direction of the upper curved surfaces of the fourth lens 10 and the fifth lens 11 .

[0048] In this embodiment, the first spacer ring 7 is detachably connected by a plurality of spacer rings; the support tube 16 includes a bottom plate, a top plate, and a spring for connecting the bottom plate and the top plate. The bottom plate and the top plate are both circular rings.

[0049] In actual use, multiple spacer rings can be detachably connected, and multiple spacer rings can be installed in combination. After the spacer rings are removed and reconnected, the thickness of the first spacer ring 7 can be changed, thereby changing the distance between the second lens 6 and the third lens 8.

[0050] It should be noted that the bottom plate is in contact with the fourth lens 10 , and the top plate is in contact with the third lens 8 .

[0051] When multiple spacer rings are installed in the inner card slot 4, the spring is in a compressed state. When there is one less spacer ring, the spring, under the action of the restoring force, drives the top plate to move toward the position of the third lens 8, which not only makes the third lens 8 tightly clamped between the first spacer ring 7 and the support tube 16, but also changes the distance between the third lens 8 and the fourth lens 10.

[0052] It should be noted that the multiple spacer rings are connected by snap-fit ​​or threaded connection.

[0053] Working principle: In this embodiment, the lens assembly includes a first lens 5, a second lens 6, a third lens 8, a fourth lens 10 and a fifth lens 11 which are sequentially engaged on the inner slot 4 from the inside to the outside. The five lenses can be disassembled and combined and installed according to usage requirements to achieve focused projection, scattered projection, partitioned projection and other projection modes.

[0054] The first spacer ring 7, the second spacer ring 9 and the support tube 16 cooperate with each other to ensure that the distance between the second lens 6 and the third lens 8, as well as the third lens 8 and the fourth lens 10 is fixed, and they will not be damaged by friction with each other. In conjunction with the first gasket 14, the second gasket 15 and the third gasket 17, friction damage will not occur between the first lens 5 and the second lens 6, the second lens 6 and the first spacer ring 7, and the fourth lens 10 and the fifth lens 11, thereby ensuring that all lenses can work stably for a long time.

[0055] When disassembling this lens, hold the outer side of the operating ring 2 with your hand, rotate the lens housing 1, and connect or separate it with the projector lens mounting hole through the external thread 3. The sealing rubber ring 13 can prevent dust from entering the inner card slot 4 from the projector lens mounting hole, and the sealing rubber ring 13 uses its own elasticity to squeeze and position the positioning ring 12, thereby assisting in positioning the fifth lens 11.

[0056] Among them, the contents not described in detail in the specification belong to the existing technology known to professional and technical personnel in this field.

[0057] The above description is only an embodiment of the present invention and does not constitute any limitation to the present invention. Any simple modification, change and equivalent structural change made to the above embodiments according to the technical essence of the present invention shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. A fixed-focus projection lens, characterized in that: The lens housing (1) comprises an outer wall of the lens housing (1) having an outer thread (3) connected to a projector at one end, a photosensitive component at one end of the inner side of the lens housing (1), an inner slot (4) for mounting the lens component at the other end of the inner side of the lens housing (1), and the lens component facing the photosensitive component; The lens assembly comprises a first lens (5), a second lens (6), a first spacer ring (7), a third lens (8), a second spacer ring (9), a fourth lens (10) and a fifth lens (11) which are sequentially engaged with the inner slot (4) from the inside to the outside. A first gasket (14) is arranged between the first lens (5) and the second gasket (15) of the second lens (6), and a second gasket (15) is arranged between the second lens (6) and the first spacer ring (7); One side of the third lens (8) is fitted with one end of the support tube (16), the other end of the support tube (16) is fitted with one side of the fourth lens (10), and a third gasket (17) is provided between the other side of the fourth lens (10) and the fifth lens (11).

2. The fixed-focus projection lens according to claim 1, characterized in that: An operating ring (2) is sleeved on the outer side of the lens housing (1); the outer side surface of the operating ring (2) is arranged as a matte surface; and the operating ring (2) is arranged in the middle of the outer wall of the lens housing (1).

3. The fixed-focus projection lens according to claim 1, characterized in that: The inner side surfaces of the first spacer ring (7) and the second spacer ring (9) are both arranged as inclined surfaces, and the thickness of the first spacer ring (7) and the second spacer ring (9) are both greater than the thickness of the center of the third lens (8).

4. The fixed-focus projection lens according to claim 1, characterized in that: One side of the fifth lens (11) is in contact with one side of a positioning ring (12), and the other side of the positioning ring (12) is in contact with a sealing rubber ring (13), and the sealing rubber ring (13) is fixedly mounted on the inner wall end of the inner card slot (4).

5. The fixed-focus projection lens according to claim 4, characterized in that: The positioning ring (12) is connected to the inner slot (4) by snap-fitting, and the inner diameter of the positioning ring (12) is smaller than the inner diameter of the sealing rubber ring (13).

6. The fixed-focus projection lens according to claim 1, characterized in that: The first gasket (14), the second gasket (15) and the third gasket (17) are all annular structures made of silicone material, and the first gasket (14), the second gasket (15) and the third gasket (17) are arranged parallel to each other.

7. The fixed-focus projection lens according to claim 1, characterized in that: The overall projection ratio of the first lens (5), the second lens (6), the third lens (8), the fourth lens (10) and the fifth lens (11) is 1.5:1 to 2:

1.

8. The fixed-focus projection lens according to claim 1 or 7, characterized in that: The first lens (5) is a 1 / 4 spherical glass spherical lens, the second lens (6) and the third lens (8) are both glass plano-concave lenses, and the fourth lens (10) and the fifth lens (11) are both glass meniscus lenses.

9. The fixed-focus projection lens according to claim 1 or 7, characterized in that: The curvature direction of the upper curved surfaces of the second lens (6) and the third lens (8) is opposite to the curvature direction of the upper curved surfaces of the fourth lens (10) and the fifth lens (11).

10. The fixed-focus projection lens according to claim 1, characterized in that: The first spacer ring (7) is detachably connected by a plurality of spacer rings; the support tube (16) comprises a bottom plate, a top plate, and a spring for connecting the bottom plate and the top plate.

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