CN107092158B

CN107092158B - Multi-angle miniature projection device

Info

Publication number: CN107092158B
Application number: CN201710404547.1A
Authority: CN
Inventors: 唐明军; 董学会; 孟春雪
Original assignee: Goertek Techology Co Ltd
Current assignee: Goertek Techology Co Ltd
Priority date: 2017-06-01
Filing date: 2017-06-01
Publication date: 2022-08-16
Anticipated expiration: 2037-06-01
Also published as: CN107092158A

Abstract

The invention discloses a multi-angle micro projection device, which solves the technical problems that a micro projection module or a projector in the prior art is fixed in projection direction and inconvenient to adjust projection angle. The multi-angle miniature projection device comprises a projection module, wherein a plane reflector is arranged on a projection path of the projection module, rotating shafts are arranged on two sides of the plane reflector, the plane reflector is mounted on a support through the rotating shafts, the plane reflector can be rotatably adjusted to a preset angle around the axis of the rotating shafts, the projection of the projection module is reflected to different directions, the plane reflector can be kept in a fixed state when the projection is adjusted to any preset angle, and the multi-angle miniature projection device is at least provided with two groups of plane reflectors in different rotating directions. The invention does not need to use an angle sensor to carry out trapezoidal correction, has simple structure, low manufacturing cost and wider use scenes, and can realize horizontal, vertical upward, vertical downward and other preset angle projections.

Description

Multi-angle miniature projection device

Technical Field

The invention relates to a visual multimedia product, in particular to a multi-angle miniature projection device which is used for projecting pictures, texts or videos.

Background

The Micro-projection module is a laser Micro-projection module based on Micro-electro-mechanical Systems (MEMS) and Micro-mirror technology, and has the advantages of small volume, low function and high embeddable degree. The micro-projection module is currently applied to products such as robots, automobiles, chargers, businesses, sound boxes and the like; the method can be developed to the fields of AR, mobile phones, watches/bracelets, 3D projection and the like in the future.

The miniature projection module makes the traditional huge projector exquisite, portable, miniaturized, entertaining and practical, and makes the projection technology closer to life and entertainment. It has the functions of business office, teaching, business, etc.

The micro-projection module in the prior art also has the following defects:

(1) micro-projection modules in electronic products such as modular sound boxes are horizontally projected, and due to the limited visual angle, vertical projection to the floor and the ceiling cannot be realized.

(2) When the micro-projection module is not perpendicular to the screen for projection, a trapezoidal picture can appear, and the picture needs trapezoidal correction.

(3) When the micro-projection module is used for trapezoidal correction, an angle sensor or a gyroscope is needed to detect an angle value, different correction parameters of the angle value are different, and an angle detection component is needed to be added.

(4) In the application practice, the trapezoidal correction of the micro-projection module can be limited by the angle value, and the use scene has certain limitation.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a multi-angle micro projection device, which utilizes a plane reflector to correct the projection direction of a projection module, wherein rotating shafts are arranged on two sides of the plane reflector and are arranged on a bracket through the rotating shafts, the plane reflector can rotate around the axis of the rotating shafts to be adjusted to a preset angle, the projection of the projection module is reflected to different directions, and the purpose of projection at various angles is realized.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the invention provides a multi-angle micro projection device which comprises a projection module, wherein a plane reflector is arranged on a projection path of the projection module, rotating shafts are arranged on two sides of the plane reflector and are arranged on a support through the rotating shafts, the plane reflector can rotate around the axis of the rotating shafts to a preset angle and reflects the projection of the projection module to different directions, the plane reflector can keep a fixed state when adjusted to any preset angle, and the multi-angle micro projection device is at least provided with two groups of plane reflectors with different rotating directions.

Further, the support comprises an inner support and an outer support, the planar reflector is mounted on the outer support, two or four groups of planar reflectors in different rotation adjusting directions are uniformly distributed on the outer support, the projection module is horizontally arranged in the inner support, the outer support can rotate around the inner support, and the planar reflectors in different rotation adjusting directions are adjusted to a projection path of the projection module; the rotary supporting surfaces of the outer support and the inner support which are contacted are circumferential surfaces.

Furthermore, the adjusting angle of the plane reflector is within the range of 0-180 degrees, and the plane reflector is perpendicular to the lens axis of the projection module when the angle is 0 degree, and can be adjusted to 180 degrees leftwards, rightwards, downwards or upwards.

Further, the rotating shaft is a regular prism, and the radial section of the rotating shaft is a regular polygon with a shape of more than a regular hexagon.

Further, the radial section of the rotating shaft is a regular octagon, a regular dodecagon, a regular hexadecagon, a regular octadecagon, a regular icosahedron or a regular thirty hexagon.

Furthermore, the support is provided with a shaft seat, the rotating shaft penetrates into the shaft seat, the radial section of the shaft seat and the radial section of the rotating shaft are the same regular polygon, and the adjusting position of the planar reflector is fixed through the matching of the shaft seat and the rotating shaft.

Furthermore, a slot is arranged on the wall of the shaft seat, and the wall of the shaft seat can expand and deform when the planar reflector rotates, so that the planar reflector is allowed to rotate and adjust to the next preset angle.

Furthermore, gaps are arranged on the side walls of the inner support and the outer support to form a projection light channel, the projection path of the projection module passes through the projection light channel, two groups or four groups of projection light channels are uniformly distributed on the outer support, and the plane reflective mirror is arranged at the projection light channel.

Further, magnets are arranged on the inner support and the outer support, and the inner support and the outer support are positioned through the magnets in the rotating process of the outer support, so that projection light channels on the inner support and the outer support are aligned.

Furthermore, a support table is arranged in the inner support, and the projection module is mounted at the top end of the support table; and a handle or a hand-clasping handle is arranged on the back of the plane reflector.

The multi-angle miniature projection device adopting the structure has the following advantages:

according to the invention, regular polygon rotating shafts on two sides of the plane reflector are matched with the regular polygon shaft base on the support, the plane reflector is manually adjusted, horizontal projection and vertical projection can be realized, and projection state switching can be realized according to different requirements.

The alignment of the plane reflector and the projection module adopts magnet adsorption positioning, and is simple and reliable.

The plane reflector can be freely folded and unfolded, and the appearance is not influenced when the plane reflector is applied to a product.

The invention does not need to use an angle sensor to carry out trapezoidal correction, can conveniently carry out projection with various angles, and has simple structure and low manufacturing cost.

The invention has wider use scene and can realize horizontal, vertical upward, vertical downward and other preset angle projection.

Drawings

Fig. 1 is an exploded view of the present invention.

Fig. 2 is an assembly view of the present invention.

Fig. 3 is a perspective view of a flat mirror employed in the present invention.

Fig. 4 is a perspective view of a flat mirror support used in the present invention.

Fig. 5 is a cross-sectional view (taken at the magnet block position) of the present invention.

Fig. 6 is a cross-sectional view (taken at the location of the axis of rotation) of the present invention.

Fig. 7 is an enlarged view of the portion I of fig. 6.

Fig. 8 is a state diagram of the present invention in use with vertical downward projection.

Fig. 9 is a state diagram of the present invention in use for horizontal projection.

Fig. 10 is a state diagram of the present invention in use with vertical upward projection.

Fig. 11 is a sectional view of a plane mirror employed in the present invention (with a buckle provided on the back).

Fig. 12 is a sectional view of a plane mirror used in the present invention (a handle is provided on the back surface).

In the figure: 1. a projection module; 2. a support table; 2-1, supporting legs; 3. a transverse frame; 4. a planar mirror; 4-1. a rotating shaft; 4-2, buckling the handle; 4-3, a handle; 5. a magnet block; 6. a cross frame; 6-1, sticking bamboo shoots; 7. a planar mirror; 8. an outer support; 8-1, projecting the optical channel; 8-2. shaft seat; 9. a magnet block; 10. an inner support; 10-1, mounting grooves; 10-2, projecting the optical channel; 10-3, flange.

Detailed Description

The design concept of the invention is as follows:

aiming at the defects of a micro-projection module in the prior art, the invention provides a multi-angle micro-projection device, which utilizes a plane reflector to correct the projection direction of the projection module, wherein rotating shafts are arranged at two sides of the plane reflector and are arranged on a bracket through the rotating shafts, the plane reflector can rotate around the axis of the rotating shafts to be adjusted to a preset angle, the projection of the projection module is reflected to different directions, the purpose of projection at various angles is realized, and the plane reflector can be kept in a fixed state when being adjusted to any preset angle.

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Example 1

Referring to fig. 1, fig. 2, fig. 3 and fig. 4, an embodiment 1 of the present invention is shown, in which a multi-angle micro-projector includes a projection module 1, and the projection module 1 is a main projection component, which is equivalent to a micro-projector in the prior art.

The projection path of the projection module 1 is provided with planar reflectors, the projection path comprises two groups of

planar reflectors

4 and 7, rotating shafts are arranged on two sides of the planar reflectors, the planar reflectors are mounted on a support through the rotating shafts, the planar reflectors can be rotatably adjusted to a preset angle around the axis of the rotating shafts, the projection of the projection module 1 is reflected to different directions, and the planar reflectors can be kept in a fixed state when adjusted to any preset angle.

In this embodiment, the bracket includes an inner bracket 10 and an outer bracket 8, the planar mirror is mounted on the outer bracket 8, and two sets of

planar mirrors

4 and 7 with different rotation adjustment directions are symmetrically arranged, the projection module 1 is horizontally arranged in the inner bracket 10, the outer bracket 8 can rotate around the inner bracket 10, and the

planar mirrors

4 and 7 with different rotation adjustment directions are adjusted to the projection path of the projection module 1.

As shown in fig. 1 and 2, the inner support 10 is cylindrical, the outer support 8 is also approximately cylindrical, but a projection is arranged at the position of the plane mirrors 4 and 7, the outer support 8 is sleeved on the inner support 10, and the bottom of the inner support 10 is provided with a flange 10-3 for supporting the outer support 8.

The inner support 10 has an outer circumferential surface and the outer support 8 has an inner circumferential surface, the outer support 8 being rotatable about the axis of the inner support 10.

The adjustment angles of the

plane reflectors

4 and 7 are in the range of 0-180 degrees, the

plane reflectors

4 and 7 are perpendicular to the axis of the lens of the projection module 1 when the angle is 0 degree, the plane reflector 4 can be adjusted upwards to 180 degrees, and the plane reflector 7 can be adjusted downwards to 180 degrees.

The maximum adjustment angle of the plane mirrors 4 and 7 does not have to reach 180 degrees, and generally the adjustment is performed until the projection path of the projection module 1 is not blocked.

As shown in fig. 1 and 3, the rotating shaft 4-1 is a regular prism, and the radial cross section is a regular polygon of regular hexagon or more. The rotating shafts on both sides of the plane mirror 7 are the same as the rotating shaft 4-1, and only the rotating shaft 4-1 is taken as an example for explanation.

The radial section of the rotating shaft 4-1 can be a regular octagon, a regular dodecagon, a regular hexadecagon, a regular octadecagon, a regular icosahedron or a regular thirty hexagon. Other regular polygonal structures than those listed above may also be employed.

The radial cross-section of the shaft 4-1 shown in fig. 1-12 is a regular octagon, which is adjustable 360/8 to 45 degrees each time.

If the radial section of the rotating shaft 4-1 is a regular dodecagon, 360 degrees/12 degrees can be adjusted to 30 degrees each time.

If the radial section of the rotating shaft 4-1 is a regular hexadecimal shape, 360 degrees/16 degrees can be adjusted to 22.5 degrees each time.

If the radial section of the rotating shaft 4-1 is a regular octagon, 360 degrees/18 degrees can be adjusted to 20 degrees each time.

If the radial section of the rotating shaft 4-1 is a regular twenty-square, 360 degrees/12 degrees can be adjusted to 15 degrees each time.

If the radial section of the rotating shaft 4-1 is a regular thirty-hexagon, 360 degrees/36 degrees can be adjusted to 10 degrees each time.

As shown in fig. 1 and 2, in order to mount the planar reflective mirror 4, an axle seat 8-2 is arranged on the outer bracket 8, a rotating shaft 4-1 penetrates into the axle seat 8-2, the axle seat 8-2 is U-shaped, the radial section of the bottom of the axle seat 8-2 and the radial section of the rotating shaft 4-1 are the same regular polygon, and the adjusting position of the planar reflective mirror 4 is fixed by matching the axle seat 8-2 and the rotating shaft 4-1.

The upper end of the wall of the shaft seat 8-2 is provided with a slit, as shown in fig. 6 and 7, so that the wall of the shaft seat 8-2 can be expanded and deformed when the plane mirror 4 rotates, allowing the plane mirror 4 to be rotatably adjusted to a next predetermined angle.

As shown in fig. 6 and 7, the

horizontal frames

3 and 6 are mounted on the shaft seat 8-2 to prevent the plane mirrors 4 and 7 from moving up and down and coming off from the shaft seat 8-2.

The shaft seat 8-2 can also be a shaft hole, the radial section of the shaft hole and the radial section of the rotating shaft 4-1 are the same regular polygon, and the adjusting position of the plane reflective mirror 4 is fixed by matching the shaft hole and the rotating shaft 4-1. The upper end of the shaft hole or the wall at one side is provided with a slit, and the wall of the shaft seat 8-2 can expand and deform when the plane mirror 4 rotates, so that the plane mirror 4 is allowed to rotate and adjust to the next preset angle.

If the rotation driving force is not applied to the plane mirrors 4 and 7, the self-gravity of the plane mirrors 4 and 7 cannot cause the wall of the shaft seat 8-2 to expand, and the rotation driving force must be applied to the plane mirrors 4 and 7 to cause the wall of the shaft seat 8-2 to expand so as to adjust the angles of the plane mirrors 4 and 7.

As shown in fig. 1 and 2, a through hole is formed in a side wall of the inner bracket 10 to form a projection light channel 10-2, and a projection path of the projection module 1 passes through the projection light channel 10-2.

As shown in FIG. 4, two groups of projection light channels 8-1 are symmetrically arranged on the outer support 8, and the

plane reflectors

4 and 7 are respectively arranged at the projection light channels 8-1. When any group of plane reflectors are adjusted to the front of the projection light channel 10-2 in a rotating mode, the projection path of the projection module 1 can penetrate through the projection light channel 10-2 and the projection light channel 8-1.

As shown in fig. 1, 2 and 5, two magnet blocks 9 are arranged on the inner support 10, one magnet block 5 is arranged on the outer support 8, and the magnet blocks are positioned during the rotation of the outer support 8 to promote the alignment of the projection light channels on the inner support 10 and the outer support 8.

When one of the magnets 9 is close to the magnet 5, the magnet is acted by magnetic attraction, and the rotary outer support 8 obviously senses the magnetic attraction, so that the projection light channel 10-2 and the projection light channel 8-1 are known to be close to and aligned until the magnet 9 and the magnet 5 reach the optimal adsorption position, and the projection light channel 10-2 and the projection light channel 8-1 are aligned.

A supporting platform 2 is arranged in the inner support 8, and the projection module 1 is installed on the top end of the supporting platform 2.

In order to facilitate the rotation of the plane mirrors 4, 7, a handle 4-2 or a knob 4-3 is provided on the back of the plane mirrors 4, 7. As shown in fig. 11, the back surface of the plane mirror 4 is provided with a buckle 4-2. As shown in fig. 12, the back surface of the plane mirror 4 is provided with a handle 4-3.

The inner support 10 and the outer support 8 may be provided with an upper cover, not shown in the figures.

As shown in fig. 8, the lens axis of the projection module 1 is horizontal to the left, and the plane mirror 4 is adjusted upward to 45 degrees, reflecting the projection of the projection module 1 to a vertically downward direction.

As shown in fig. 9, the lens axis of the projection module 1 is horizontally leftward, and the plane mirror 4 is adjusted upward to 135 degrees, so that the projection of the projection module 1 is no longer reflected, and the projection direction of the projection module 1 is maintained horizontally leftward.

As shown in fig. 10, the lens axis of the projection module 1 is horizontally oriented to the left, the outer holder 8 is rotated by 180 degrees, the plane mirror 7 is adjusted to the front of the projection light path 10-2, and the plane mirror 7 is adjusted downward by 45 degrees, reflecting the projection of the projection module 1 to a vertically upward direction.

Still taking fig. 8 as an example, when the plane mirror 4 is adjusted to other angles, the projection of the projection module 1 is also reflected to other different angles, for example, the radial section of the rotating shaft 4-1 is regular hexadecagon, the plane mirror 4 is rotated clockwise to 67.5 degrees, and the projection of the projection module 1 is reflected to 45 degrees from the vertical direction. The change of the projection angle caused by the rotating shaft 4-1 with other structures can be conveniently deduced according to the geometrical relationship, and is not listed.

In summary, compared with the prior art, the multi-angle micro-projection apparatus in the embodiment has the following features:

1) the multi-angle miniature projection device can realize horizontal, vertical upward and vertical downward projection, and can meet the scene of projection to the ground and the ceiling.

2) When the multi-angle miniature projection device projects vertically upwards or vertically downwards, the function can be realized only by turning and correcting the plane reflector without trapezoidal correction. And therefore need not be limited by the keystone correction viewing angle.

3) The multi-angle miniature projection device utilizes the regular octagon rotating shaft structure of the plane reflector and the notch groove of the support to provide deformation of the plane reflector, realizes angle rotation of the plane reflector, and does not need to additionally add an angle sensor.

4) The outer support is rotatable relative to the inner support and the axes of the two coincide. The projection module 1 is positioned by manually adjusting the outer support to rotate about 180 degrees relative to the inner support and looking at the direction of the plane reflector under the attraction of two magnets, so that the positioning is realized, and the device is simple and reliable.

Example 2

In this embodiment, different from embodiment 1, four groups of plane mirrors with different rotation directions are uniformly arranged on the outer support 8, the existing plane mirrors 4 and 7 can be reserved, two groups of plane mirrors with different rotation directions are symmetrically arranged between the plane mirrors 4 and 7, one group of the plane mirrors can be adjusted by rotating to the left, and the other group of the plane mirrors can be adjusted by rotating to the right. This increases the projection adjustment angle of the projection module 1.

Because the number of the plane mirrors is increased, four lugs are required to be arranged on the outer support 8 for mounting the plane mirrors, but four parts of cylindrical walls are remained on the outer support 8 and can continuously rotate around the axis of the inner support 10.

Because the number of the plane reflectors is increased, four magnet blocks 9 are also arranged on the inner support 10, and the optimal adsorption positions of the magnet blocks 9 and the magnet blocks 5 also need to meet the alignment position of any one group of plane reflectors and the projection light channel 10-2.

The other structures of the multi-angle micro-projection device in this embodiment are the same as those in embodiment 1, and the description thereof will not be repeated.

The foregoing is merely a specific embodiment of the present invention, and other modifications and variations based on the above embodiments may be made by those skilled in the art in light of the above teachings. It should be understood by those skilled in the art that the foregoing detailed description is for the purpose of better explaining the present invention, and the scope of the present invention should be determined by the scope of the appended claims.

Claims

1. A multi-angle micro projection device comprises a projection module, and is characterized in that a plane reflector is arranged on a projection path of the projection module, rotating shafts are arranged on two sides of the plane reflector and are mounted on a support through the rotating shafts, the plane reflector can rotate around the axis of the rotating shafts to be adjusted to a preset angle, the projection of the projection module is reflected to different directions, the plane reflector can keep a fixed state when adjusted to any preset angle, and the multi-angle micro projection device is at least provided with two groups of plane reflectors in different rotating directions;

the projection module is horizontally arranged in the inner bracket, and the outer bracket can rotate around the inner bracket to adjust the plane reflectors in different rotation adjustment directions to a projection path of the projection module; the rotary supporting surfaces of the outer support and the inner support which are contacted are circumferential surfaces.

2. The multi-angle micro projection device of claim 1, wherein the adjustment angle of the planar mirror is in the range of 0-180 degrees, and the planar mirror is perpendicular to the lens axis of the projection module at an angle of 0 degrees and is adjustable to 180 degrees left, right, down, or up.

3. The multi-angle micro-projection apparatus of claim 1, wherein the rotation axis is a regular prism, and the radial cross section is a regular polygon with a shape of regular hexagon or more.

4. The multi-angle micro projector apparatus as claimed in claim 3, wherein the radial cross section of the rotation axis is regular octagon, regular dodecagon, regular hexadecagon, regular octadecagon, regular icosahedron, or regular thirty hexagon.

5. The multi-angle micro projector apparatus as claimed in claim 3, wherein the bracket is provided with a shaft seat, the rotating shaft penetrates into the shaft seat, the radial cross section of the shaft seat and the radial cross section of the rotating shaft are the same regular polygon, and the adjusting position of the planar reflector is fixed by the cooperation of the shaft seat and the rotating shaft.

6. The multi-angle pico projection device of claim 5, wherein the walls of said axle housing are provided with slits, and the walls of said axle housing expand and deform as said flat mirror rotates, allowing said flat mirror to be rotationally adjusted to the next predetermined angle.

7. The multi-angle micro-projection device of claim 1, wherein the side walls of the inner and outer frames are provided with notches to form a projection light channel, the projection path of the projection module passes through the projection light channel, two or four sets of projection light channels are evenly distributed on the outer frame, and the planar reflective mirror is installed at the projection light channel.

8. The multi-angle micro-projection device of claim 7, wherein the inner and outer supports are provided with magnets, and the magnets are positioned during the rotation of the outer support to facilitate alignment of the projection light paths on the inner and outer supports.

9. The multi-angle pico projection device of claim 1, wherein a support is provided in said inner support, said projection module being mounted on top of said support; and a handle or a hand-clasping handle is arranged on the back of the plane reflector.