CN114859635B - Optical projection equipment - Google Patents

Abstract

The present application discloses an optical projection device. The optical projection device comprises: an optical housing and a cover plate, wherein a receiving cavity is provided in the optical housing, and the cover plate is used to cover the receiving cavity; a lens group, wherein the lens group comprises a plurality of lenses, and the lenses are located in the receiving cavity; a connecting member, wherein a connecting member is provided between the lens group and the cover plate, and when the cover plate covers the receiving cavity, the surface of the connecting member away from the cover plate abuts against the upper end surface of each lens in the lens group, or is bonded to the upper end surface of each lens in the lens group.

Description

Optical projection device

Technical Field

The present application relates to the technical field of optical devices, and more specifically, to an optical projection device.

Background technique

The digital light processing (DLP) projection optical display method has the characteristics of high brightness, high contrast and high resolution. Combined with LED light source, it can realize miniaturized portable micro-projection, which is welcomed by more and more users.

In the prior art, glue is dispensed between the lens and the side wall of the optical housing to fix the lens in the optical housing. In order to fix the lens, at least two glue dispensing positions are formed between the lens and the side wall of the optical housing, and glue is dispensed at corresponding glue dispensing positions one by one by a glue dispensing device.

It can be seen that the current method of dispensing glue between the lens and the side wall of the optical housing will result in a large number of glue dispenses, a cumbersome glue dispensing process, and the risk of incomplete glue curing and volatilization.

Summary of the invention

One purpose of the present application is to provide a new technical solution for optical projection equipment.

According to a first aspect of an embodiment of the present application, an optical projection device is provided. The optical projection device comprises: an optical housing and a cover plate, wherein a receiving cavity is provided in the optical housing, and the cover plate is used to cover the receiving cavity;

A lens group, the lens group comprising a plurality of lenses, and the lenses are located in the accommodating cavity;

A connecting piece is provided between the lens group and the cover plate. When the cover plate covers the accommodating cavity, the surface of the connecting piece away from the cover plate abuts against the upper end surface of each lens in the lens group, or is bonded to the upper end surface of each lens in the lens group.

Optionally, the upper end surface of the lens includes a middle area and edge areas located on both sides of the middle area, and the connecting member abuts or bonds with the middle area, or the connecting member abuts or bonds with the middle area and the edge area.

Optionally, the connecting member is an elastic pressing portion.

Optionally, the connecting member is a metal spring sheet, and when the cover plate covers the accommodating cavity, the metal spring sheet is close to the surface of the cover plate and contacts with the inner surface of the cover plate.

Optionally, the metal spring comprises a spring body and a first elastic arm connected to the spring body; the lens group comprises a first lens arranged opposite to the side wall of the optical housing;

When the cover plate covers the accommodating cavity, the spring body abuts against the upper surface of each lens in the lens group, and the first elastic arm is inserted between the first lens and the side wall of the optical housing.

Optionally, the metal spring comprises a second elastic arm, and the second elastic arm extends from a side end portion of the spring body;

The lens group includes a circular lens, and when the cover plate covers the accommodating cavity, the second elastic arm abuts against the upper end surface of the circular lens.

Optionally, a hollow portion is provided on the metal spring sheet.

Optionally, the connecting member is an elastic column, a first end of the elastic column is connected to the cover plate, and a second end of the elastic column is used to abut against an upper end surface of the lens.

Optionally, the length of the elastic column is a first length, the distance between the inner surface of the cover plate and the upper end surface of the lens is a second length, and the first length is ≥ the second length.

Optionally, a through hole is provided on the cover plate, and the first end of the elastic column extends into the through hole to connect the elastic column to the cover plate; or a recess is formed on the inner surface of the cover plate, and the first end of the elastic column is embedded in the recess to connect the elastic column to the cover plate.

Optionally, the connecting member is an adhesive member, one end of the adhesive member is bonded to the cover plate, and the other end of the adhesive member is used to bond to the upper end surface of the lens.

A technical effect of an embodiment of the present application is that an embodiment of the present application provides an optical projection device, wherein a connecting member is provided between the lens group and the cover plate, and when the cover plate covers the accommodating cavity, the surface of the connecting member away from the cover plate abuts against the upper end surface of each lens in the lens group, or is bonded to the upper end surface of each lens in the lens group; when the surface of the connecting member away from the cover plate abuts against the upper end surface of each lens in the lens group, the use of glue to fix the lenses is avoided, thereby solving the risk of incomplete curing and volatilization of the glue; when the surface of the connecting member away from the cover plate is bonded to the upper end surface of each lens in the lens group, the formation of a glue spot position between the lens and the side wall of the optical housing is avoided, and the present application forms a glue spot position between the cover plate and the upper end surface of the lens, thereby reducing the number of glue spots.

Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application.

FIG. 1 shows a first structural diagram of the optical projection device of the present application (the cover plate structure is not shown).

FIG. 2 is a schematic diagram showing the structure of the metal spring of the present application.

FIG. 3 shows a second structural schematic diagram of the optical projection device of the present application.

Description of reference numerals:

1. Optical housing; 11. Accommodating cavity; 2. Lens group; 21. First lens; 3. Metal spring; 31. Spring body; 311. First spring body; 312. Second spring body; 32. First elastic arm; 33. Second elastic arm; 34. Hollow portion; 4. Elastic column; 5. Cover plate.

Detailed ways

Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

The present application provides an optical projection device, for example, the optical projection device may be a DLP projection optical machine.

1 to 3, the optical projection device comprises: an optical housing 1, a cover plate 5, a lens group 2 and a connector. The optical housing 1 is provided with a receiving cavity 11, and the cover plate 5 is used to cover the receiving cavity 11. The lens group 2 comprises a plurality of lenses, and the lenses are located in the receiving cavity 11. A connector is provided between the lens group 2 and the cover plate 5, and when the cover plate 5 covers the receiving cavity 11, the surface of the connector away from the cover plate 5 abuts against the upper end surface of each lens in the lens group 2, or is bonded to the upper end surface of each lens in the lens group 2.

In this embodiment, a housing 1 is provided in the optical housing 1, for example, two housings 11 are provided in the optical housing 1, one of which is a lens chamber, and the other is a light source chamber, and a cover plate 5 is provided to cover and cover the housing 11, for example, the cover plate 5 covers the light source chamber and the lens chamber. For example, the light source chamber and the lens chamber may share a cover plate 5, or the light source chamber and the lens chamber may be covered by different cover plates 5, respectively.

In this embodiment, the optical projection device includes a lens group 2, and the lenses in the lens group 2 are located in the accommodating cavity 11, wherein the lenses in the lens group 2 are located in the accommodating cavity 11, and only a pre-fixing operation is performed on the lenses, and the lenses are finally fixed through the connecting parts.

For example, the lens can be simply placed in the accommodating cavity 11, or the lens can be clamped in the accommodating cavity 11, but the lens and the side wall of the accommodating cavity 11 are not fixed by glue. When the lens is clamped in the accommodating cavity 11, a clamping groove can be formed on the side wall of the accommodating cavity 11, and the lens is simply clamped in the clamping groove; or the lens abuts against the side wall of the accommodating cavity 11, so that the lens is simply clamped in the accommodating cavity 11.

In order to avoid forming multiple glue spots on the lens and the side wall of the accommodating cavity 11, and to avoid increasing the number of glue spots and making the glue spotting process complicated, the present application sets a connector between the cover plate 5 and the lens group, and the connector acts on the upper end surface of the lens so that the lens is finally fixed in the accommodating cavity 11. The connector can be connected to the cover plate 5, or the connector can be not connected to the cover plate 5 (just contact).

In a specific embodiment, when the cover plate 5 covers the accommodating cavity 11, the surface of the connector away from the cover plate 5 abuts against the upper end surface of each lens in the lens group 2. Specifically, the cover plate 5 is covered on the optical housing 1, and the pressing force of the cover plate 5 connected to the optical housing 1 acts on the connector, and the connector generates an abutting force with the upper end surface of the lens, and the lens is fixed in the accommodating cavity 11 through the abutting force.

In another specific embodiment, when the cover plate 5 covers the accommodating cavity 11, the surface of the connector away from the cover plate 5 is bonded to the upper end surface of each lens in the lens group 2. Specifically, the cover plate 5 is covered on the optical housing 1, and the connector plays a role in connecting the cover plate 5 and the upper end surface of the lens. For example, the connector can be pre-bonded on the cover plate 5, and when the cover plate 5 is covered on the optical housing 1, the other end of the connector will be bonded to the upper end surface of the lens, avoiding multiple glue dispensing between the lens and the inner side wall of the accommodating cavity 11, thereby avoiding the problem of cumbersome glue dispensing process.

Therefore, an embodiment of the present application provides an optical projection device, in which a connecting piece is arranged between the lens group 2 and the cover plate 5. When the surface of the connecting piece away from the cover plate 5 abuts against the upper end surface of each lens in the lens group 2, the use of glue to fix the lens is avoided, thereby solving the risk of incomplete curing and volatilization of the glue; when the surface of the connecting piece away from the cover plate 5 is bonded to the upper end surface of each lens in the lens group 2, the formation of a glue spot position between the lens and the side wall of the optical housing 1 is avoided. The present application forms a glue spot position between the cover plate 5 and the upper end surface of the lens, thereby reducing the number of glue spots.

In one embodiment, as shown in Figures 1 and 3, the upper end surface of the lens includes a middle area and edge areas on both sides of the middle area, and the connecting member abuts or bonds with the middle area, or the connecting member abuts or bonds with the middle area and the edge area.

In this embodiment, a connector is provided between the cover plate 5 and the lens group 2, and the connector acts on the upper end surface of the lens, wherein the upper end surface of the lens includes a middle area and edge areas on both sides of the middle area.

In one embodiment, the connector abuts or bonds with the middle area. For example, the abutment force of the connector on the lens or the area where the connector and the lens are bonded are mainly concentrated in the middle area of the lens. This can achieve the purpose of fixing the lens in the accommodating cavity 11.

In yet another embodiment, in order to improve the reliability of fixing the lens, the connecting piece may be abutted against or bonded to the middle area and the edge area.

In a specific embodiment, the lens includes a circular lens (for example, a spherical lens is a circular lens) and a square lens (for example, an aspherical lens is a square ginger slice); the circular lens is made of glass, and considering the surface sensitivity of the circular lens (the surface sensitivity is relatively small) and the material, the connector can form a matching relationship with the middle area and the edge area of the upper end surface of the circular lens. The square lens is generally formed by plastic, and the material of the square lens is plastic. Considering the surface sensitivity of the square lens (the surface sensitivity is relatively large) and the material, the connector can only form a matching relationship with the middle area of the upper end surface of the square lens.

In one embodiment, referring to FIG. 1 to FIG. 3 , the connecting member is an elastic pressing portion.

In this embodiment, the connecting member is defined as an elastic pressing portion, that is, an elastic pressing portion is arranged between the cover plate 5 and the lens group 2, and when the cover plate 5 covers the accommodating cavity 11, the elastic pressing portion will produce elastic deformation under the action of the cover plate 5, and with the help of the elastic deformation of the elastic pressing portion itself, the elastic pressing portion and the upper end surface of the lens form a matching relationship, for example, the elastic pressing portion abuts against the upper end surface of the lens, so that the lens is fixed in the accommodating cavity 11.

In one embodiment, as shown in FIG. 1 and FIG. 2 , the connecting member is a metal spring 3 , and when the cover plate 5 covers the accommodating cavity 11 , the metal spring 3 is close to the surface of the cover plate 5 and contacts the inner surface of the cover plate 5 .

In this embodiment, the elastic pressing part is a metal spring 3, that is, a metal spring 3 is arranged between the cover plate 5 and the lens group 2, and the lens is fixed in the optical housing 1 by the elasticity of the metal spring 3 itself, avoiding the solution of using glue to fix in the prior art, reducing the cost of glue residue treatment, and solving the volatilization problem caused by incomplete glue curing. In addition, this embodiment uses the elasticity of the metal spring 3 itself to fix the lens in the optical housing 1, avoiding the solution of using glue to fix in the prior art, saving the time for dispensing and curing, and improving the assembly efficiency by more than 3 times.

In addition, in this embodiment, the elastic pressing part is a metal spring 3, that is, a metal spring 3 is arranged between the cover plate 5 and the lens group 2, and the cover plate 5 covers the optical housing 1 (that is, the cover is arranged above the accommodating cavity 11 to seal the accommodating cavity 11), and the cover plate 5 has a force acting on the metal spring 3 (that is, the cover plate 5 and the optical housing 1 are fixed by bolt locking, and the cover plate 5 has a pressing force acting on the metal spring 3), and the cover plate 5 is in contact with the metal spring 3. At this time, the temperature inside the optical machine is exported to the outside of the optical projection device through the heat conduction characteristics of the metal spring 3, which can reduce the temperature of the optical projection device and solve the heat dissipation problem of the optical projection device itself.

In an optional embodiment, the metal spring sheet 3 can be placed on the lens group 2 first, and the metal spring sheet 3 can slightly protrude from the accommodating cavity 11, so that the cover plate 5 is covered on the accommodating cavity 11, and the cover plate 5 presses the metal spring sheet 3 so that the metal spring sheet 3 abuts against the upper end surface of the lens, thereby fixing the lens.

In one embodiment, when the optical projection device is a high-lumen (high-brightness), high-power, and high-temperature optical mechanical device, a metal spring 3 can be set between the cover plate 5 and the lens group 2, which can fix the lens on the one hand and conduct heat on the other hand.

In one embodiment, as shown in FIG. 2 , the metal spring 3 includes a spring body 31 and a first elastic arm 32 connected to the spring body 31 ; the lens group 2 includes a first lens 21 disposed adjacent to the side wall of the optical housing 1 ;

When the cover plate 5 covers the accommodating cavity 11 , the spring body 31 abuts against the upper surface of each lens in the lens group 2 , and the first elastic arm 32 is inserted between the first lens 21 and the side wall of the optical housing 1 .

In this embodiment, as shown in FIG. 1 , the lens group 2 in the accommodating cavity 11 includes lenses arranged along the length direction of the optical projection device, and lenses arranged along the width direction of the optical projection device. In order to satisfy the requirement that a metal spring 3 is provided between each lens and the cover plate 5, the spring body 31 of this embodiment includes a first spring body 311 extending along the length direction of the optical projection device, and a second spring body 312 extending along the width direction of the optical projection device, and the first spring body 311 and the second spring body 312 are integrally formed. For example, the first spring body 311 has a length direction and a width direction, wherein the length extension direction of the first spring body 311 is the width extension direction of the second spring body 312, and the width extension direction of the first spring body 311 is the length extension direction of the second spring body 312.

In this embodiment, the lens group 2 includes a first lens 21 disposed adjacent to the side wall of the optical housing 1. For example, a side surface of the first lens 21 (for example, the surface may be an optical surface of the first lens 21) is disposed opposite to the side wall disposed along the length direction, or opposite to the side wall disposed along the width direction. Referring to FIG. 1 , five lenses are shown, wherein the five lenses are all the first lenses 21 defined in this embodiment.

In this embodiment, in order to improve the fixing reliability of the lens group 2 and the integrity of the fixing of the lens group 2, a first elastic arm 32 is provided at the end of the spring body 31 (for example, the end of the spring body 31 along its length direction). For example, the spring body 31 and the first elastic arm 32 are integrally formed.

When the cover plate 5 covers the optical housing 1, the first elastic arm 32 will be inserted between the first lens 21 and the side wall of the optical housing 1 (the side wall arranged opposite to the first lens 21) under the action of the cover plate 5, thereby improving the integrity of the fixation of the lens group 2.

In an optional embodiment, in order to facilitate the insertion of the first elastic arm 32 between the first lens 21 and the side wall, the first elastic arm 32 is inclined relative to the spring body 31; specifically, the first elastic arm 32 is inclined downward relative to the spring body 31, so as to facilitate the insertion of the first elastic arm 32 between the first lens 21 and the side wall.

It should be noted that the structure of the metal spring 3 in this embodiment is not limited to this structure, and the user can design the structure of the metal spring 3 differently according to the arrangement of the lens group 2 in the accommodating cavity 11 and the arrangement of different types of lenses.

It should be noted that the structure of the first elastic arm 32 in the metal spring 3 of this embodiment is not limited to the arrangement shown in FIG. 2 , and the user can design the arrangement of the first elastic arm 32 in the metal spring 3 differently according to the arrangement of the lenses in the accommodating cavity 11 .

In one embodiment, as shown in FIG. 2 , the metal spring 3 includes a second elastic arm 33 , and the second elastic arm 33 extends from the side end of the spring body 31 .

The lens assembly 2 includes a circular lens. When the cover plate 5 covers the accommodating cavity 11 , the second elastic arm 33 abuts against an edge region of an upper end surface of the circular lens.

In this embodiment, the metal spring 3 includes a second elastic arm 33, wherein the second elastic arm 33 is located on the side end of the spring body 31. For example, the spring body 31 has two side ends. Taking the first spring body 311 as an example, the two side ends of the first spring body 311 are arranged opposite to each other in the length direction of the first spring body 311. A second elastic arm 33 is arranged on each of the two side ends of the first spring body 311.

Among the circular lenses in the lens set 2, considering that most circular lenses are spherical lenses and are made of glass, in order to improve the fixing reliability of the circular lenses, when the cover plate 5 covers the accommodating cavity 11, the second elastic arm 33 abuts against the upper end surface of the circular lenses. As shown in FIG1 , the lens located at the upper left corner of the right accommodating cavity 11 and the lens located at the lower right corner of the right accommodating cavity 11 are both circular lenses.

Specifically, the elastic body abuts against the center area of the upper end surface of the circular lens, and the second elastic arm 33 abuts against the edge area of the upper end surface of the circular lens. In order to improve the symmetry of the circular lens fixation, two second elastic arms 33 extend from the elastic body, and the two second elastic arms 33 are respectively located on both sides of the elastic body.

In an optional embodiment, the square lens in the lens group 2 is considered to be mostly aspherical lenses and the material of the square lens is mostly plastic material, so as to avoid the square lens from affecting the light beam transmission performance, only the central area of the upper end surface of the square lens is pressed by the spring body 31. For example, as shown in FIG. 1 , the lens located in the left accommodating cavity 11 and adjacent to the beam splitter prism is a square lens, and the lens in the upper right corner of the right accommodating cavity 11 is a square lens.

In an optional embodiment, in order to facilitate better fitting of the second elastic element to the edge area of the upper end surface of the circular lens, the second elastic arm 33 is inclined downward relative to the spring body 31 .

It should be noted that the structure of the second elastic arm 33 in the metal spring 3 of this embodiment is not limited to the arrangement shown in Figure 2. The user can design the arrangement of the second elastic arm 33 in the metal spring 3 differently according to the arrangement of different types of lenses in the accommodating cavity 11.

In one embodiment, as shown in FIG. 1 and FIG. 2 , a hollow portion 34 is formed on the metal spring sheet 3 .

In this embodiment, a hollow portion 34 is provided on the metal spring 3, for example, a hollow portion 34 can be designed in a place where no pressing is required, so as to save materials and facilitate the assembly of the metal spring 3. For example, a certain area of the metal spring 3 is hollowed out and removed, so that a hollow portion 34 is formed on the metal spring 3; or in an optional embodiment, a certain area of the metal spring 3 is cut, but not removed from the spring body 31, so that one side of the cut metal spring 3 is connected to the spring body 31, and in the process of fixing the lens, the cut metal spring 3 can abut against one surface of the lens, thereby improving the reliability of fixing the lens.

In an optional embodiment, the elastic deformation pressure of the metal spring 3 is ≤4kgf, and the positioning accuracy is controlled within ±0.1mm. This embodiment limits the elastic deformation pressure of the metal spring 3. When the elastic deformation pressure exceeds 4kgf, there is a risk of the PV surface of the lens exceeding the specification; for example, when the elastic deformation pressure exceeds 4kgf, the optical surface structure of the lens will be affected, which will in turn affect the transmitted light.

In one embodiment, the material of the metal spring 3 includes but is not limited to iron, copper, aluminum, steel, and other alloy materials.

In one embodiment, as shown in FIG. 3 , the connecting member is an elastic column 4 , a first end of the elastic column 4 is connected to the cover plate 5 , and a second end of the elastic column 4 is used to abut against the upper end surface of the lens.

In this embodiment, the elastic pressing portion is an elastic column 4 , for example, the elastic column 4 may include but is not limited to a silicone column, or a spiral spring column, etc.

In this embodiment, the first end of the elastic column 4 is connected to the cover plate 5, for example, the first end of the elastic column 4 is fixedly connected to the cover plate 5. After the elastic column 4 is arranged on the cover plate 5, when the cover plate 5 covers the optical housing 1, the elastic column 4 will produce elastic deformation, so that the second end of the elastic column 4 can abut against the upper end surface of the lens. For example, the second end of the elastic column 4 can abut against the central area of the upper end surface of the lens, or the second end of the elastic column 4 can abut against the central area and the edge area of the upper end surface of the lens.

In this embodiment, the elasticity of the elastic column 4 is used to fix the lens in the optical housing 1, avoiding the solution of using glue to fix in the prior art, reducing the cost of handling glue residues, and solving the volatilization problem caused by incomplete glue curing. In addition, this embodiment uses the elasticity of the elastic column 4 to fix the lens in the optical housing 1, avoiding the solution of using glue to fix in the prior art, saving the time for dispensing and curing, and improving the assembly efficiency by more than 3 times.

In an optional embodiment, the elastic column 4 is limited to a silicone column. Since the silicone column has a smaller effect on heat conduction of the lens, when the connecting member is set as a silicone column, it is suitable for optical projection equipment with lower power and lower brightness.

In an optional embodiment, the elastic column 4 is a silicone column, and the material of the silicone column is silicone material, which can withstand at least 160°C. The shape of the silicone column can be, but is not limited to, cylindrical, elongated, and a special-shaped silicone column that matches a special-shaped lens. When the silicone column is a cylindrical structure, it is connected to the cover plate 5 through one end of the silicone column. After the cover plate 5 is locked, the silicone column is pressed against the center of the lens, so that the lens is fixed. Or the silicone column is a long strip structure, and is connected to the cover plate 5 through one end of the silicone column. After the cover plate 5 is locked, the silicone column is pressed against the center of the lens and the silicone column covers the skirt (edge area) of the entire lens, so that the silicone column is elastically deformed and pressed against the lens, so that the lens is fixed. In a specific embodiment, different areas of the upper end surface of the lens can be selectively pressed according to different shapes and types of lenses.

In an optional embodiment, considering the cost of making a mold for the silicone column, the silicone columns are designed to be of the same shape as much as possible to save the mold cost. For example, the silicone columns can all be round columns, or can all be rectangular columns.

In an optional embodiment, the elastic deformation pressure of the silicone column is ≤4kgf. This embodiment limits the elastic deformation pressure of the silicone column. When the elastic deformation pressure exceeds 4kgf, there is a risk of the PV surface of the lens exceeding the specification; for example, when the elastic deformation pressure exceeds 4kgf, the optical surface structure of the lens will be affected, which will in turn affect the transmission of light.

In one embodiment, as shown in FIG. 3 , the length of the elastic column 4 is a first length, the distance between the inner surface of the cover plate 5 and the upper end surface of the lens is a second length, and the first length is ≥ the second length.

In this embodiment, when the cover plate 5 is pressed and covered on the optical housing 1, the elastic column 4 undergoes elastic deformation to facilitate the elastic column 4 to abut against the upper end surface of the lens. This embodiment limits the length of the elastic column 4 and the distance from the inner surface of the cover plate 5 to the upper end surface of the lens. For example, the height of the silicone column is designed to be at least 1 times the distance from the lens to the inner surface of the cover plate 5.

In one embodiment, a through hole is provided on the cover plate 5, and the first end of the elastic column 4 extends into the through hole to connect the elastic column 4 to the cover plate 5; or a recess is provided on the inner surface of the cover plate 5, and the first end of the elastic column 4 is embedded in the recess to connect the elastic column 4 to the cover plate 5.

In this embodiment, when the thickness of the cover plate 5 is relatively thin, a through hole is opened on the cover plate 5, and the through hole passes through the inner surface and the outer surface of the cover plate 5. The first end of the elastic column 4 extends into the through hole and fits tightly with the through hole, so that the elastic column 4 is connected to the cover plate 5; or when the thickness of the cover plate 5 is relatively thick, a recessed portion is formed on the inner surface of the cover plate 5, and the first end of the elastic column 4 is embedded in the recessed portion and fits tightly with the recessed portion, so that the elastic column 4 is connected to the cover plate 5.

It should be noted that the present embodiment does not impose any particular limitation on the connection method between the elastic column 4 and the cover plate 5 , as long as the elastic column 4 can be disposed on the cover plate 5 .

In one embodiment, the connecting member is an adhesive member, one end of which is bonded to the cover plate 5 , and the other end of which is used to bond to the upper end surface of the lens.

In this embodiment, the connecting member is an adhesive member, that is, an adhesive member is provided between the cover plate 5 and the middle lens of the lens group 2, one end of the adhesive member is connected to the inner surface of the cover plate 5, and after the cover plate 5 is covered on the optical housing 1, the other end of the adhesive member can be bonded to the upper end surface of the lens. Therefore, this embodiment improves the glue point position when the lens is fixed by glue, and the glue point position is formed between the lens and the side wall of the optical housing 1 in the prior art, and is changed to form an adhesive between the upper end surface of the lens and the inner surface of the cover plate 5 (that is, the glue point position is located between the lens and the cover plate 5). For example, glue can be firstly applied to the cover plate 5 (the glue point position corresponds to the lens position), and the cover plate 5 is covered on the optical housing 1. At this time, the adhesive member (the adhesive member has a height dimension) provided on the cover plate 5 is bonded to the upper end surface of the lens. In this embodiment, the cover plate 5 and the lens are connected together by an adhesive member, which is convenient for users to remove the lens.

In an optional embodiment, the adhesive may be silicone which is lower in cost, more resistant to high temperatures, and less volatile, including but not limited to epoxy glue, UV glue, silicone glue, hot melt glue, and the like.

In an optional embodiment, the center position of the lens is selectively pressed by the adhesive of the optical machine cover plate 5, or the center area and edge area of the lens are pressed, so that the lens is fixed.

The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims (10)

1. An optical projection device, characterized in that the optical projection device comprises: An optical housing (1) and a cover plate (5), wherein a receiving cavity (11) is provided in the optical housing (1), and the cover plate (5) is used to cover the receiving cavity (11); A lens group (2), the lens group (2) comprising a plurality of lenses, the lenses being located in the accommodating cavity (11); A connecting piece, wherein the connecting piece is arranged between the lens group (2) and the cover plate (5), and when the cover plate (5) covers the accommodating cavity (11), a surface of the connecting piece away from the cover plate (5) abuts against the upper end surface of each lens in the lens group (2), or is bonded to the upper end surface of each lens in the lens group (2); The connecting member comprises a spring body (31) and a first elastic arm (32) connected to the spring body (31); the lens group (2) comprises a first lens (21) arranged opposite to the side wall of the optical housing (1); When the cover plate (5) covers the accommodating cavity (11), the spring body (31) abuts against the upper end surface of each lens in the lens group (2), and the first elastic arm (32) is inserted between the first lens (21) and the side wall of the optical housing (1). 2. The optical projection device according to claim 1 is characterized in that the upper end surface of the lens includes a middle area and edge areas located on both sides of the middle area, and the connecting member abuts or bonds with the middle area, or the connecting member abuts or bonds with the middle area and the edge area. 3 . The optical projection device according to claim 1 , wherein the connecting member is an elastic pressing portion. 4. The optical projection device according to claim 3 is characterized in that the connecting member is a metal spring (3), and when the cover plate (5) covers the accommodating cavity (11), the metal spring (3) is close to the surface of the cover plate (5) and contacts the inner surface of the cover plate (5). 5. The optical projection device according to claim 4, characterized in that the metal spring (3) comprises a second elastic arm (33), and the second elastic arm (33) extends from the side end of the spring body (31); The lens group (2) comprises a circular lens, and when the cover plate (5) covers the accommodating cavity (11), the second elastic arm (33) abuts against the edge area of the upper end surface of the circular lens. 6. The optical projection device according to claim 4, characterized in that a hollow portion (34) is provided on the metal spring sheet (3). 7. The optical projection device according to claim 3, characterized in that the connecting member is an elastic column (4), a first end of the elastic column (4) is connected to the cover plate (5), and a second end of the elastic column (4) is used to abut against the upper end surface of the lens. 8. The optical projection device according to claim 7, characterized in that the length of the elastic column (4) is a first length, the distance between the inner surface of the cover plate (5) and the upper end surface of the lens is a second length, and the first length is ≥ the second length. 9. The optical projection device according to claim 7 is characterized in that a through hole is formed on the cover plate (5), and the first end of the elastic column (4) extends into the through hole so that the elastic column (4) is connected to the cover plate (5); or a recessed portion is formed on the inner surface of the cover plate (5), and the first end of the elastic column (4) is embedded in the recessed portion so that the elastic column (4) is connected to the cover plate (5). 10. The optical projection device according to claim 1, characterized in that the connecting member is an adhesive member, one end of the adhesive member is bonded to the cover plate (5), and the other end of the adhesive member is used to bond to the upper end surface of the lens.