CN219318289U

CN219318289U - Imaging lens and projection device

Info

Publication number: CN219318289U
Application number: CN202320634550.3U
Authority: CN
Inventors: 庞海权; 夏彪; 杨明华
Original assignee: Guangzhou Colorful Stage Equipment Co Ltd
Current assignee: Guangzhou Colorful Stage Equipment Co Ltd
Priority date: 2023-03-27
Filing date: 2023-03-27
Publication date: 2023-07-07
Anticipated expiration: 2033-03-27

Abstract

The utility model provides an imaging lens and a projection device. The imaging lens includes a central lens portion and a peripheral lens portion disposed around a periphery of the central lens portion; the peripheral lens portion having opposed first outer and inner surfaces, at least one of the first outer and inner surfaces having a plurality of convex regions; the central lens portion has opposing second outer and second inner surfaces, and the second outer surface of the central lens portion protrudes from the first outer surface of the peripheral lens portion and/or the second inner surface of the central lens portion protrudes from the first inner surface of the peripheral lens portion. The imaging lens provided by the utility model has clear imaging.

Description

Imaging lens and projection device

Technical Field

The present utility model relates to the field of optical imaging, and in particular, to an imaging lens and a projection apparatus.

Background

Starry sky projection lamps are used as a decorative projection device for transmitting light to a wall or ceiling to form a pattern of stars, moon, etc. to create a quiet, romantic, comfortable atmosphere. The patterns projected by the traditional star-sky projection lamp are single, and aesthetic fatigue is easy to generate for people. For this reason, there are emerging on the market some star projection lamps capable of projecting complex patterns (e.g. aurora). However, the definition of the complex pattern projected by the existing star field projection lamp is not enough, which is a problem to be solved by those skilled in the art.

Disclosure of Invention

In view of this, the present utility model aims to provide an imaging lens and a projection apparatus that can solve or at least alleviate the above-mentioned problems.

In one aspect, the present utility model provides an imaging lens comprising a central lens portion and a peripheral lens portion disposed around a periphery of the central lens portion; the peripheral lens portion having opposed first outer and inner surfaces, at least one of the first outer and inner surfaces having a plurality of convex regions; the central lens portion has opposing second outer and second inner surfaces, and the second outer surface of the central lens portion protrudes from the first outer surface of the peripheral lens portion and/or the second inner surface of the central lens portion protrudes from the first inner surface of the peripheral lens portion.

In some embodiments, there is a transition space between the second outer surface and the second inner surface of the central lens portion.

In some embodiments, the central lens portion comprises a first central lens portion and a second central lens portion of split design, the first central lens portion and the second central lens portion having the transition space therebetween, the first central lens portion providing the second outer surface and the second central lens portion providing the second inner surface.

In some embodiments, the first central lens portion and the second central lens portion are each circular, and the area of the first central lens portion is greater than the area of the second central lens portion.

In some embodiments, the peripheral lens portion has a central hole, the central lens portion further includes an annular connecting portion, one end of the annular connecting portion is connected to the second central lens portion, the other end is connected to a hole wall of the central hole of the peripheral lens portion, and the first central lens portion is disposed at the other end of the annular connecting portion.

In some embodiments, the first central lens portion is snap-fit with the peripheral lens portion.

In some embodiments, the first central lens portion has one or more resilient catches on its peripheral wall, the annular connecting portion having one or more catch holes, the one or more resilient catches being adapted to snap to the peripheral lens portion via the one or more catch holes.

In some embodiments, the imaging lens is a unitary piece.

On the other hand, the utility model also provides a projection device which comprises the imaging lens.

The utility model provides an imaging lens, wherein at least one of the second outer surface and the second inner surface of the central lens part protrudes out of at least one of the first outer surface and the first inner surface of the peripheral lens part, when the imaging lens is applied to a projection device, the focal length of the lens is effectively shortened, the magnification factor of the lens is improved, the projection area is larger, the imaging deformation is small, and the imaging is clearer.

Drawings

Further features of the utility model will become more apparent from the following description of preferred embodiments, provided by way of example only in connection with the accompanying drawings, in which:

FIG. 1 is a perspective view of a first embodiment of an imaging lens of the present utility model;

FIG. 2 is another perspective view of the imaging lens shown in FIG. 1;

FIG. 3 is a top view of the imaging lens shown in FIG. 1;

FIG. 4 is a cross-sectional view taken along the A-A direction of the imaging lens of FIG. 3;

FIG. 5 is a B-B cross-sectional view of the imaging lens of FIG. 3;

FIG. 6 is an exploded view of the imaging lens shown in FIG. 1;

fig. 7 is a perspective view of a peripheral lens portion of the imaging lens shown in fig. 6;

fig. 8 is a perspective view of a central lens portion of the imaging lens of fig. 6;

FIG. 9 is a perspective view of a second embodiment of an imaging lens of the present utility model;

FIG. 10 is another perspective view of the imaging lens of FIG. 9;

FIG. 11 is a perspective view of a third embodiment of an imaging lens of the present utility model;

FIG. 12 is a schematic view of an imaging lens of the present utility model a perspective view of the fourth embodiment; and

fig. 13 is a perspective view of an embodiment of a projection device of the present utility model.

Detailed Description

The following detailed description of the utility model refers to the accompanying drawings and the detailed description of the utility model, so that the technical scheme and the beneficial effects of the utility model are more clear. It is to be understood that the drawings are designed solely for the purposes of illustration and not as a definition of the limits of the utility model, for which the dimensions are shown in the drawings for the purpose of clarity only and do not limit the true to scale.

Referring to fig. 1 and 2, an imaging lens 100 of a first embodiment of the present utility model includes a central lens portion 10 and a peripheral lens portion 20 disposed around the periphery of the central lens portion 10. The peripheral lens portion 20 has opposing first outer and

inner surfaces

201, 202, and at least one of the first outer and

inner surfaces

201, 202 has a plurality of irregularly convex regions 203 for projection patterning. The central lens portion 10 has opposite second outer and

inner surfaces

101, 102, and the second outer surface 101 of the central lens portion 10 protrudes from the first outer surface 201 of the peripheral lens portion 20 and/or the second inner surface 102 of the central lens portion 10 protrudes from the first inner surface 202 of the peripheral lens portion 20. In other words, at least one of the

surfaces

101, 102 of the central lens portion 10 of the imaging lens 100 provided in the present embodiment protrudes from the

corresponding surface

201, 202 of the peripheral lens portion 20, which effectively shortens the focal length of the lens, improves the magnification of the lens, and has larger projection area, smaller imaging deformation and clearer imaging.

In this embodiment, the plurality of irregular convex regions 203 are formed on the first inner surface 202 of the peripheral lens portion 20, and the first outer surface 201 of the peripheral lens portion 20 is smooth. Therefore, it can also be understood that in the present embodiment, the peripheral lens portion 20 includes a plurality of plano-convex lenses. In other embodiments, the plurality of irregular convex regions 203 may also be formed on the first outer surface 201 of the peripheral lens portion 20 such that the first inner surface 202 of the peripheral lens portion 20 is smooth. Alternatively, a plurality of irregular convex regions 203 may be provided on both the first outer surface 201 of the peripheral lens portion 20 and the first inner surface 202 of the peripheral lens portion 20. In other embodiments, additional patterns, such as a circular or spiral frosted pattern, may also be formed on the first outer surface 201 and/or the first inner surface 202 of the peripheral lens portion 20.

In this embodiment, the entire area of the first inner surface 202 of the peripheral lens portion 20 is provided with the convex area 203. It will be appreciated that in other embodiments, the convex region 203 may also be provided in a partial region of the first inner surface 202 of the peripheral lens portion 20, such as 90%, 80%, 70%, 60% or 50%, preferably at least 40% of the region.

Preferably, the number of the plurality of irregular convex regions 203 is not less than ten. It is also preferred that not less than two thirds of the plurality of irregular, elongated shaped regions 203 be in the form of an irregular, elongated shape, wherein a radially inner side of each irregular, elongated shaped region 203 is adjacent to the central lens portion 10 and a radially outer side extends to an outer periphery of the peripheral lens portion 20, such as the convex region 203a shown in fig. 2. Preferably, a portion of the elongated convex region 203 may also be arbitrarily divided into two or more irregular convex regions, such as the two irregular convex regions 203b shown in fig. 2.

Referring to fig. 3 to 5, in the present embodiment, the peripheral lens portion 20 is substantially annular in a circumferential direction (i.e., a direction around the central axis L of the peripheral lens portion 20), and has a central hole 204 at the center thereof for accommodating the central lens portion 10. The peripheral lens portion 20 is substantially arched in the axial direction (i.e., in the direction along the central axis L of the peripheral lens portion 20), i.e., the first inner surface 202 of the peripheral lens portion 20 is concave toward the first outer surface 201 of the peripheral lens portion 20, and the first outer surface 201 of the peripheral lens portion 20 is convex away from the first inner surface 202 of the peripheral lens portion 20.

In this embodiment, the second outer surface 101 of the central lens portion 10 protrudes from the first outer surface 201 of the peripheral lens portion 20 in a direction away from the second inner surface 102, the second inner surface 102 of the central lens portion 10 protrudes from the first inner surface 202 of the peripheral lens portion 20 in a direction away from the second outer surface 101, and the protruding height of the second inner surface 102 of the central lens portion 10 with respect to the first inner surface 202 of the peripheral lens portion 20 is greater than the protruding height of the second outer surface 101 of the central lens portion 10 with respect to the first outer surface 201 of the peripheral lens portion 20.

In other embodiments, the protruding height of the second inner surface 102 of the central lens portion 10 relative to the first inner surface 202 of the peripheral lens portion 20 may be smaller than the protruding height of the second outer surface 101 of the central lens portion 10 relative to the first outer surface 201 of the peripheral lens portion 20. Alternatively, the protruding height of the second inner surface 102 of the central lens portion 10 with respect to the first inner surface 202 of the peripheral lens portion 20 is equal to the protruding height of the second outer surface 101 of the central lens portion 10 with respect to the first outer surface 201 of the peripheral lens portion 20.

Alternatively, only the second outer surface 101 of the central lens portion 10 may protrude beyond the first outer surface 201 of the peripheral lens portion 20 in a direction away from the second inner surface 102, while the second inner surface 102 of the central lens portion 10 is flush or substantially flush with the first inner surface 202 of the peripheral lens portion 20. Alternatively, it is also possible that only the second inner surface 102 of the central lens portion 10 protrudes beyond the first inner surface 202 of the peripheral lens portion 20 in a direction away from the second outer surface 101, whereas the second outer surface 101 of the central lens portion 10 is flush or substantially flush with the first outer surface 201 of the peripheral lens portion 20.

In this embodiment, the second outer surface 101 and the second inner surface 102 of the central lens portion 10 are smooth. It will be appreciated that in other embodiments, the pattern may be formed by providing a convex region on one or both of the second outer surface 101 and the second inner surface 102 of the central lens portion 10.

Preferably, there is a transition space 103 between the second outer surface 101 and the second inner surface 102 of the central lens portion 10, which helps to reduce the thickness of the solid material of the central lens portion 10.

Referring to fig. 4 to 6, it is also preferable that in the present embodiment, the central lens portion 10 includes a first central lens portion 11 and a second central lens portion 12 of a split design, and the first central lens portion 11 is at least partially aligned with the second central lens portion 12 in the axial direction. The split design of the central lens portion 10 is more convenient to produce.

Preferably, at least 1/4 of the first central lens portion 11 is axially aligned with 1/4 of the second central lens portion 12, more preferably at least 1/2 of the first central lens portion 11 is axially aligned with 1/2 of the second central lens portion 12, more preferably at least 3/4 of the first central lens portion 11 is axially aligned with 3/4 of the second central lens portion 12, most preferably the central axis of the first central lens portion 11 coincides with the central axis of the second central lens portion 12 as shown.

In this embodiment, the first central lens portion 11 is located above the second central lens portion 12. In other embodiments, the first central lens portion 11 may also be located below the second central lens portion 12.

In this embodiment, a surface of the first central lens portion 11 facing away from the second central lens portion 12 is the second outer surface 101 of the central lens portion 10. A surface of the second central lens portion 12 facing away from the first central lens portion 11 is the second inner surface 102 of the central lens portion 10. The transition space 103 is formed between a surface 104 of the first central lens portion 11 facing the second central lens portion 12 and a surface 105 of the second central lens portion 12 facing the first central lens portion 11. It will be appreciated that in other embodiments, the surface 104 of the first central lens portion 11 and the surface 105 of the second central lens portion 12 may also be in contact with each other without forming the transition space 103.

In this embodiment, the first central lens portion 11 is preferably a biconvex lens. Similarly, the second central lens portion 12 also preferably employs a biconvex lens. It will be appreciated that in other embodiments, the first central lens portion 11 and/or the second central lens portion 12 may take other configurations, such as plano-convex lenses, etc.

In this embodiment, the first central lens portion 11 and the second central lens portion 12 are circular in the circumferential direction. It will be appreciated that in other embodiments, the first central lens portion 11 may take other shapes, such as square, etc. Preferably, the area of the first central lens portion 11 is larger than the area of the second central lens portion 12, which facilitates imaging of the first central lens portion 11.

In this embodiment, the second central lens portion 12 is connected, preferably integrally connected, with the peripheral lens portion 20. The first central lens portion 11 is adapted to be fitted to the peripheral lens portion 20 and/or the second central lens portion 12. In other words, in the present embodiment, the center lens portion 10 is formed by assembly. It will be appreciated that in other embodiments, the first central lens portion 11 may be mounted directly above or below the second central lens portion 12 by means of other mounting portions such as a support frame, without being mounted to the peripheral lens portion 20 and/or the second central lens portion 12. Similarly, in other embodiments, the second central lens portion 12 may be mounted below or above the first central lens portion 11 by means of a mounting portion such as another support frame, instead of being connected to the peripheral lens portion 20.

Referring to fig. 6 to 8, in order to facilitate the installation of the first central lens portion 11, in this embodiment, the central lens portion 10 further includes an annular connecting portion 13. One end of the annular connecting portion 13 is connected to the second central lens portion 12, and the other end is connected to a wall of the central hole 204 of the peripheral lens portion 20. The first central lens portion 11 is assembled at one end of the annular connecting portion 13 connected to the peripheral lens portion 20, that is, the first central lens portion 11 is just accommodated in the central hole 204 of the peripheral lens portion 20.

The annular connecting portion 13 is substantially truncated in the axial direction corresponding to the aforementioned area of the first central lens portion 11 being larger than the area of the second central lens portion 12, wherein the cross-sectional area of the end of the annular connecting portion 13 connected to the second central lens portion 12 is smaller than the cross-sectional area of the end of the annular connecting portion 13 connected to the peripheral lens portion 20.

Preferably, the annular connection portion 13, the second central lens portion 12, and the peripheral lens portion 20 are integrally connected to improve their strength. It will be appreciated that in other embodiments, the annular connecting portion 13, the second central lens portion 12, and the peripheral lens portion 20 may be designed separately and then assembled together.

Preferably, the first central lens portion 11 is snap-connected to the peripheral lens portion 20. Specifically, the outer peripheral wall of the first central lens portion 11 is provided with one or more elastic snap-fit hooks 110, and the annular connecting portion 13 has one or more snap-fit holes 130, and the one or more elastic snap-fit hooks 110 are adapted to be snapped onto the step surface of the peripheral lens portion 20 adjacent to the central hole 204 thereof via the one or more snap-fit holes 130. In this embodiment, two symmetrical elastic buckles 110 are provided on the outer peripheral wall of the first central lens portion 11. Correspondingly, two symmetrical fastening holes 130 are also provided on the annular connecting portion 13. Each elastic buckle 110 corresponds to a corresponding buckle hole 130.

In order to improve the assembling stability of the first central lens portion 11, it is preferable that an end surface of the annular connecting portion 13 connected to the peripheral lens portion 20 is at least partially protruded radially inward with respect to the peripheral lens portion 20 to form a supporting step 131 for supporting the outer circumference of the first central lens portion 11.

It is also preferred that the outer side of the resilient clip 110 forms a wedge surface 111 which facilitates a smoother clipping of the first central lens portion 11 into a clip connection with the peripheral lens portion 20. Further preferably, the radially inner side 112 of the elastic buckle 110 is fixedly connected with the first central lens portion 11, the radially outer side 113 protrudes from the first central lens portion 11, and the protruding degree of the radially outer side 113 of the elastic buckle 110 is sufficient to make the elastic buckle 110 stably buckle with the step surface of the peripheral lens portion 20 adjacent to the central hole 204 thereof.

It will be appreciated that in other embodiments, the first central lens portion 11 may be connected to the peripheral lens portion 20 in other ways, such as a tight fit, adhesive, etc. Alternatively, in other embodiments, the first central lens portion 11 may be mounted to the annular connecting portion 13 without being directly connected to the peripheral lens portion 20. For example, the fastening hole 130 may not penetrate the annular connecting portion 13, but may form a fastening groove, in which case, the elastic fastening 110 on the first central lens portion 11 only needs to be fastened into the fastening groove of the annular connecting portion 13.

Referring to fig. 9 and 10, an imaging lens 200 of a second embodiment of the present utility model is generally similar to the imaging lens 100 of the first embodiment described above, with the primary difference being that the imaging lens 200 of the present embodiment is a unitary piece. In other words, the central lens portion 210 and the peripheral lens portion 20 of the present embodiment are not assembled, but are directly integrally formed by injection molding or the like. Similar to the first embodiment, both surfaces of the central lens portion 210 of the imaging lens 200 of the present embodiment protrude with respect to the corresponding surfaces of the peripheral lens portion 20, which can also achieve shortening of the focal length of the lens, reduction of imaging distortion, and clearer imaging. In this embodiment, the central lens portion 210 is substantially in the shape of an oblate sphere. Alternatively, the central lens portion 210 may be solid as a whole or may be hollow, i.e. have said transition space 103.

Referring to fig. 11, an imaging lens 300 of the third embodiment of the present utility model is generally similar to the imaging lens 100 of the first embodiment described above, with the primary difference being that the plurality of irregular convex regions 3203 on the imaging lens 300 of the present embodiment form a pattern that is different from the plurality of irregular convex regions 282 on the imaging lens 100 of the first embodiment. Similarly to the first embodiment, not less than two thirds of the plurality of irregular convex regions 3203 on the imaging lens 300 of the present embodiment are also irregularly elongated, wherein a radially inner side of each irregular elongated convex region 3203a is adjacent to the central lens portion 10, and a radially outer side extends to an outer periphery of the peripheral lens portion 20. However, the number of irregular convex regions 3203b into which the partial elongated convex region 3203a is divided in the present embodiment is greater, thereby resulting in a denser pattern formed by the plurality of irregular convex regions 3203 of the present embodiment as a whole. It should be noted that the elongated shape herein is not strictly an elongated shape in a geometric sense, and a shape having a maximum length larger than a maximum width may be an elongated shape, and an edge of the elongated shape may be a straight line or a curved line. The elongated convex region may be a single elongated convex region or may be an elongated region formed by integrating a plurality of irregular first convex regions.

Referring to fig. 12, an imaging lens 400 of the fourth embodiment of the present utility model is generally similar to the imaging lens 100 of the first embodiment described above, with the main difference being that a plurality of convex regions 4203 on the peripheral lens portion 420 of the imaging lens 400 of the present embodiment are formed in a generally spiral pattern. Specifically, the plurality of convex regions 4203 are substantially spirally extended outward toward the outer periphery of the peripheral lens portion 420 about the central lens portion 10. The radially inner side of each first convex region 4203 is adjacent to the central lens portion 10 or near the central lens portion 10, and the radially outer side extends to the outer periphery of the peripheral lens portion 420, opposite circumferential sides and is substantially arc-shaped. It will be appreciated that in other embodiments, depending on the desired imaging effect, the plurality of convex regions on the peripheral lens portion of the imaging lens may also take other shapes and/or patterns, which are not described in detail herein.

Referring to fig. 13, the present utility model also provides a projection apparatus 500 including the

aforementioned imaging lens

100 or 200 or 300 or 400. In particular, the projection device 500 is preferably a star field projection lamp. Due to the adoption of the imaging lens, the starry sky projection lamp can project complex patterns with clear imaging, such as aurora and the like. It will be appreciated that in other embodiments, the projection device 500 may be used to project other patterns, and is not limited to use as a star field projection lamp.

The above description is merely of a preferred embodiment of the present utility model, the protection scope of the present utility model is not limited to the above-listed examples, and any simple changes or equivalent substitutions of the technical solutions that can be obviously obtained by those skilled in the art within the technical scope of the present utility model disclosed in the present utility model fall within the protection scope of the present utility model.

Claims

1. An imaging lens characterized by comprising a central lens portion and a peripheral lens portion arranged around a periphery of the central lens portion; the peripheral lens portion having opposed first outer and inner surfaces, at least one of the first outer and inner surfaces having a plurality of convex regions; the central lens portion has opposing second outer and second inner surfaces, and the second outer surface of the central lens portion protrudes from the first outer surface of the peripheral lens portion and/or the second inner surface of the central lens portion protrudes from the first inner surface of the peripheral lens portion.

2. The imaging lens of claim 1 wherein said second outer surface and said second inner surface of said central lens portion have a transition space therebetween.

3. The imaging lens of claim 2 wherein said central lens portion comprises first and second central lens portions of split design, said first and second central lens portions having said transition space therebetween, said first central lens portion providing said second outer surface and said second central lens portion providing said second inner surface.

4. The imaging lens of claim 3 wherein said first central lens portion and said second central lens portion are each circular and wherein an area of said first central lens portion is greater than an area of said second central lens portion.

5. The imaging lens as claimed in claim 3, wherein the peripheral lens portion has a central hole, the central lens portion further comprises an annular connecting portion, one end of the annular connecting portion is connected to the second central lens portion, the other end is connected to a wall of the central hole of the peripheral lens portion, and the first central lens portion is disposed at the other end of the annular connecting portion.

6. The imaging lens of claim 5 wherein said first central lens portion is snap-fit with said peripheral lens portion.

7. The imaging lens of claim 6, wherein one or more resilient snaps are provided on an outer peripheral wall of the first central lens portion, the annular connecting portion having one or more snap holes, the one or more resilient snaps being adapted to snap to the peripheral lens portion via the one or more snap holes.

8. The imaging lens of claim 1 or 2, wherein the imaging lens is a unitary piece.

9. A projection apparatus comprising an imaging lens according to any one of claims 1 to 8.