CN212623538U

CN212623538U - Ultra-miniature projection optical actuator

Info

Publication number: CN212623538U
Application number: CN202021205020.XU
Authority: CN
Inventors: 赵金生; 叶世博; 赖韦龙; 廖坤鸿; 李昌儒
Original assignee: MIN AIK Tech CO Ltd
Current assignee: MIN AIK Tech CO Ltd
Priority date: 2020-06-24
Filing date: 2020-06-24
Publication date: 2021-02-26
Anticipated expiration: 2030-06-24

Abstract

The utility model provides an ultra-miniature projection optical actuator, which is characterized in that a metal punched suspension elastic sheet is erected above a base, an optical lens is carried on the suspension elastic sheet, a magnetic assembly is arranged on the periphery of the optical lens, the magnetic assembly can form a magnetic field after being electrified, and attracts the suspension elastic sheet by means of electromagnetic signals, so that the suspension elastic sheet rotates repeatedly in a specific direction by taking a virtual axis as an axis; not only has smaller volume and excellent elasticity, but also can save cost, and is particularly suitable for the use of projection machines.

Description

Ultra-miniature projection optical actuator

Technical Field

The present invention relates to an ultra-miniature projection optical actuator, and more particularly to an optical actuator suitable for projection equipment, which is mainly a magnetic swing design suitable for both single axis and double axis, and can make the swing of the actuator more stable and accurate, and greatly improve the resolution and stability of projection.

Background

Under the three prerequisites that the more advanced optical projection system is required to have a smaller volume, a better projection resolution and a lower cost, the design of the more advanced single-axis optical projection system is shown in fig. 11 and 12, in which an image of a microchip panel 92 (e.g., DMD) is projected to a projection screen (not shown) through a prism 91, an actuator 80 and a lens 90; the projection light passes through the lens in the actuator 80 during the process of traveling, and the actuator 80 performs rapid and repeated vibration (changes the projection position), so as to increase the resolution by continuously changing the position of the image.

However, as shown in fig. 13, 14 and 15, a conventional actuator 80 has a base 81, a square assembly groove 801 is formed in the center of the base 81, and a bearing 82 and a rotating shaft 83 are respectively disposed at opposite positions of the assembly groove 801; a swinging member 84 is disposed between the two rotating shafts 83; since the swinging member 84 is composed of a stage 841 and a lens 842, when the actuator is under electromagnetic action (not shown) on the peripheral side, the swinging member 84 can be driven to swing up and down regularly around the axis L1 between the two bearings 82 and the rotating shaft 83, so as to change the position of projection, which is the most common usage.

The optical actuator 80 of the conventional projection apparatus has a structural disadvantage that the bearing 82 and the rotating shaft 83 are used as the pivot points, but a gap is formed between the bearing 82 and the rotating shaft 83, so that when the optical actuator swings up and down on two sides at a high speed, the position of the pivot point itself jumps up and down due to the gap, or the rotating shaft 83 is axially shifted in the bearing 82, so that the position of light projection is changed from time to time due to the gap and axial displacement, an unpredictable error is generated, and the resolution is unstable.

Secondly, the conventional actuator 80 has a bearing 82 on a base 81, which cannot be reduced or thinned, so that the volume of the product is limited, the manufacturing cost is high, and the maintenance and replacement after abrasion are high in cost.

Moreover, these structures still belong to two-point swing based on a single axis L1, and if the resolution is to be improved, it is necessary to design multi-point swing spots to further increase the projected resolution to one floor, and when the optical actuator improves the multi-spot swing, besides the structural ingenuity, the size needs to be further reduced, but the accuracy and stability of the multi-point moving spot are still maintained, which has been difficult in the past and is a breakthrough in the industry.

In order to solve the above problems, the applicant has developed a very advanced design of a biaxial optical projection system, but the design of the biaxial optical projection system is different from that of a uniaxial structure, and if a uniaxial or biaxial structure is required in a product, completely different members are required to be used, the manufacturing and die opening costs are doubled, and if a uniaxial or biaxial structure can be combined with a large part of the design, the number of suspension spring pieces matched with corresponding magnetic assemblies can be changed, and the biaxial optical projection system can be used in a uniaxial or biaxial rotation situation, so that the manufacturing cost can be greatly reduced, the maintenance cost and the difficulty of replacing parts can be reduced, and a great breakthrough can be obtained.

SUMMERY OF THE UTILITY MODEL

The main objective of the present invention is to design a base for single-axis and dual-axis universal use, wherein a single-axis or dual-axis suspension spring is erected on the base, the suspension spring carries an optical lens, and a magnetic assembly is disposed around the optical lens, and the magnetic assembly can form a magnetic field after being energized, and attracts the suspension spring by means of electromagnetic signals, so that the suspension spring rotates repeatedly in a specific direction with a virtual axis as an axis; because the base, the coil, the optical lens, the magnetic assembly and the protecting cover of the utility model are the same, and the suspension elastic sheet has two or four different elastic parts, the suspension elastic sheet can be completely changed into a single-shaft or double-shaft mode by matching with two or four magnetic assemblies, the structure is simplified, the space is not occupied, the swing is more accurate and durable, and the die sinking cost and the maintenance cost are saved; the mould has the advantages of simplifying parts, reducing the volume and the mould opening cost, and is particularly suitable for mass production and application on projection machines.

To achieve the above object, a first embodiment of the present invention is achieved by:

a base is arranged, a plurality of locking pins are arranged at the corners of the base, a light transmission hole is arranged at the center of the base, the light transmission hole is matched with the shape of the optical lens to form a square body approximately, a cushion block is respectively arranged at each of the four corners of the edge of the light transmission hole in a pairwise opposite mode, and an inserting column is respectively arranged above the cushion block; the suspension elastic sheet is formed by stamping a metal sheet and comprises a central frame body, wherein each of opposite corners of the central frame body is provided with an elastic part, each elastic part is provided with a fixed part, each fixed part is provided with a jack, two sides of each fixed part are respectively provided with a first elastic line and a second elastic line, the other ends of the first elastic line and the second elastic line are connected with the central frame body, and at least one section of bending part is formed on each of the first elastic line and the second elastic line; the suspension spring plate forms a virtual axis between the jacks on the two elastic parts, and the first elastic line (and the bending part) and the second elastic line (and the bending part) are exactly bisected by the virtual axis and are mutually symmetrical; at least one group of two opposite coils are respectively arranged at the edges of two opposite ends of the light hole of the base; the optical lens is provided with a magnetic component at each of two opposite sides, the magnetic component is provided with a magnetic conduction plate, the outer side of the magnetic conduction plate is provided with a first magnet and a second magnet which are arranged up and down, so that the magnetic conduction plate, the first magnet and the second magnet form a magnetic ring, and the inner side surface of the magnetic conduction plate is connected with the optical lens; the optical lens is fixedly connected to the upper surface of the central frame body of the suspension elastic sheet, the suspension elastic sheet is sleeved on the plug post of the base through the plug hole of the fixing part, the suspension elastic sheet bears the optical lens, the magnetic assemblies are erected on the cushion block of the base, the two magnetic assemblies can form a magnetic force field after being electrified, and the suspension elastic sheet is attracted by means of electromagnetic signals and rotates towards two sides repeatedly by taking the virtual axis as an axis.

Wherein: the base is provided with a convex bearing seat between every two cushion blocks at the edge of the light hole, and the top of the bearing seat forms an arc-shaped groove easy to bear.

Wherein: the base is provided with a wire slot below, and the base is connected with the circuit board by virtue of a connecting wire penetrating through the wire slot.

Wherein: the bending parts of the first elastic line and the second elastic line of the suspension elastic sheet are spring structure bodies which are continuously bent for three times.

Wherein: a protecting cover is arranged above the base of the suspension spring plate, the protecting cover is provided with a central hole, and a plurality of buckling edges are respectively arranged on the side edges to be buckled on the base.

The second embodiment of the present invention is achieved by the following means:

a base, which is provided with locking legs at the corners and a light hole at the center, wherein the light hole is approximately square by matching the shape of the optical lens, and the four corners at the edge of the light hole are respectively provided with a cushion block in a pairwise opposite manner, and an inserting column is respectively arranged above the cushion block; the suspension elastic sheet is formed by stamping a metal sheet and comprises a central frame body, wherein each of opposite corners of the central frame body is provided with an elastic part, each elastic part is provided with a fixed part, each fixed part is provided with a jack, two sides of each fixed part are respectively provided with a first elastic line and a second elastic line, the other ends of the first elastic line and the second elastic line are connected with the central frame body, and at least one section of bending part is formed on each of the first elastic line and the second elastic line; the suspension spring plate forms a virtual axis between the jacks on the two elastic parts, and the first elastic line (and the bending part) and the second elastic line (and the bending part) are exactly bisected by the virtual axis and are mutually symmetrical; at least one group of two opposite coils are respectively arranged at the edges of two opposite ends of the light hole of the base; the optical lens is provided with a magnetic component at each of two opposite sides, the magnetic component is provided with a magnetic conduction plate, the outer side of the magnetic conduction plate is provided with a first magnet and a second magnet which are arranged up and down, so that the magnetic conduction plate, the first magnet and the second magnet form a magnetic ring, and the inner side surface of the magnetic conduction plate is connected with the optical lens; the optical lens is fixedly connected to the upper surface of the central frame body of the suspension elastic sheet, and the suspension elastic sheet is sleeved on the plug post of the base through the plug hole of the fixing part, so that the suspension elastic sheet bears the optical lens and the magnetic assembly is erected on the cushion block of the base; the four magnetic assemblies can form a magnetic force field after being electrified, and attract the suspension elastic sheet by virtue of electromagnetic signals, so that the suspension elastic sheet rotates repeatedly towards angles in two directions by taking the virtual axis as an axis.

The utility model discloses have following a few advantages in the use:

1. the utility model discloses a base, coil, optical lens piece, magnetic force component, protecting cover all are the same, and suspend in midair the shell fragment and only have two or four elasticity portions's difference, and two or four magnetic force components of cooperation can be changed into unipolar or biax mode completely, and the structure is retrencied and is not taken up the space, and makes the swing more accurate and durable, saves die sinking cost and cost of maintenance.

2. The utility model discloses a can accept in the base more easily on hanging in midair shell fragment and magnetic force component's the cooperation, consequently enable whole optical actuator's volume and reach minimum, use on being particularly suitable for the machines and tools of super miniature projection for cost reduction just does not account for the space.

Drawings

Fig. 1 is an external view of the single-shaft rotation structure of the present invention.

Fig. 2 is an exploded perspective view of the single-shaft rotating device of the present invention.

Fig. 3 is a plan view of the suspension spring plate according to the embodiment of the present invention, which is a single-shaft rotating structure.

Fig. 4 is a three-dimensional structure view of the suspension spring plate of the present invention using single-shaft rotation as an embodiment.

Fig. 5 is a longitudinal sectional view of the present invention with a single-shaft rotation as an example.

Fig. 6 is a perspective view of the present invention with a dual-axis rotation as an example.

Fig. 7 is an exploded perspective view of the present invention with a dual-axis rotation as an example.

Fig. 8 is a plan view of the suspension spring plate according to the embodiment of the present invention, which is formed by dual-axis rotation.

Fig. 9 is a three-dimensional structure view of the suspension spring plate according to the embodiment of the present invention.

Fig. 10 is a longitudinal sectional view of the present invention with a dual-axis rotation as an example.

Fig. 11 is a schematic diagram of an application of a conventional optical actuator 1.

Fig. 12 is a schematic diagram of an application of a conventional optical actuator 2.

Fig. 13 is a perspective view of a conventional single-axis optical actuator.

Fig. 14 is a plan view of fig. 13.

Fig. 15 is a sectional view taken along line a-a of fig. 14.

Description of reference numerals: [ the utility model ] 10 bases; 11 light holes; 12 locking the feet; 13 cushion blocks; 14 inserting a column; 15, a bearing seat; 16 wire grooves; 20 hanging the elastic sheet; 20' hanging the elastic sheet; 200 a central frame; 20A elastic part; 20L bisects the virtual axis; 20L' bisects the virtual axis; 21 a fixing part; 22 jack holes; 23 first elastic threads; 231 a bent portion; 24 second elastic threads; 241 bending part; 30 coils; 31 a coil; 32 coils; 33 coils; 40 an optical lens; 50 a magnetic assembly; 51 a first magnet; 52 a second magnet; 53 magnetic conductive plate; 60 a protective cover; 61 mesopores; 62, buckling edges; 63, buckling edges; 64 buckling edges; 70 a circuit board; an Lx virtual axis; ly a virtual axis; m1 rotational torque; m2 rotational torque; m3 rotational torque; m4 rotational torque; [ conventional ] 80 actuator; 801 an assembly groove; 81 base seat; 82 bearings; 83 a rotating shaft; 84 an oscillating member; 841 a carrier; 842 lenses; a 90 lens; a 91 prism; a 92 microchip panel; the L1 axis.

Detailed Description

Please refer to fig. 1, fig. 2 and fig. 3, which are a perspective assembly view and an exploded view of a first embodiment of the present invention; therefore, the utility model discloses include at least:

a base 10, which has a plurality of locking legs 12 at the corners for conveniently locking the projector (not shown) with locking members (such as screws, bolts, rivets, clamps, etc.); the base 10 is further provided with a light hole 11 at the center, the light hole 11 is approximately square in shape matched with the optical lens 40, and a cushion block 13 is respectively arranged at four corners of the edge of the light hole 11 in a pairwise opposite manner, and an inserting column 14 is respectively arranged above the cushion block 13; a convex bearing seat 15 is arranged between every two cushion blocks 13 at the edge of the light hole 11, and an arc-shaped groove which is easy to bear is formed at the top of the bearing seat 15; the base 10 has a wire slot 16 at the bottom for connecting with a circuit board 70.

Referring to fig. 3 and 4, a suspension spring plate 20, which is made of a stamped metal sheet, includes a central frame 200, and the preferred embodiment of the central frame 21 is a square body with round corners; an opposite corner of the square central frame 21 is respectively provided with an elastic part 20A, the elastic part 20A is provided with a fixed part 21, the fixed part 21 is provided with a jack 22, two sides of the fixed part 21 are respectively provided with a first elastic line 23 and a second elastic line 24, the other ends of the first elastic line 23 and the second elastic line 24 are connected with the central frame 200, and at least one section of

bending part

231, 241 is formed on the first elastic line 23 and the second elastic line 24; in detail, the preferred embodiment of the

bending portions

231 and 241 is that spring structures bent more than three times continuously are disposed at the middle positions of the first elastic line 23 and the second elastic line 24, and the suspension elastic sheet 20 forms a virtual axis 20L between the insertion holes 22 on the two elastic portions 20A, and the first elastic line 23 (and the bending portion 231) and the second elastic line 24 (and the bending portion 241) are exactly bisected by the virtual axis 20L and are symmetrical to each other.

Referring to fig. 2 and 3, at least one set of two

opposite coils

30 and 31 are respectively disposed on two opposite end edges of the light hole 11 of the base 10, and can be disposed on the top arc-shaped grooves of the two bearing seats 15 on the base 10, so as to be more stable.

Referring to fig. 1, 2, 3 and 5, an optical lens 40 is provided with a magnetic assembly 50 at least at two opposite sides, the magnetic assembly 50 has a magnetic conductive plate 53, and a first magnet 51 and a second magnet 52 are provided at the outer side of the magnetic conductive plate 53 in an up-and-down arrangement, so that the magnetic conductive plate 53, the first magnet 51 and the second magnet 52 form a magnetic ring, and the inner side of the magnetic conductive plate 53 is further connected (e.g., bonded) with the optical lens 40; the optical lens 40 is adhered to the upper surface of the central frame 200 of the suspension spring 20, and the suspension spring 20 is sleeved on the plug post 14 of the base 10 through the insertion hole 22 of the fixing portion 21, so that the suspension spring 20 carries the optical lens 40 and the magnetic assembly 50 is mounted on the pad 13 of the base 10.

Referring to fig. 1, 2 and 5, a protecting cover 60 has a central hole 61, and a plurality of

fastening edges

62, 63 and 64 are respectively disposed at the side edges for fastening on the base 10.

In the present invention, please refer to fig. 1, fig. 2 and fig. 3, the suspension spring 20 carries the optical lens 40, and two fixing portions 21 are sleeved on the insertion posts 14 of the base 10, so that the suspension spring 20 forms a virtual axis LX between the two insertion posts 14; when the two

opposite coils

30, 31 are energized, the two

opposite coils

30, 31 can generate an absorbing or repelling effect on two sides of the suspension spring 20, and the suspension spring 20 carrying the optical lens 40 can be rotated clockwise or counterclockwise around the virtual axis LX to form clockwise or counterclockwise rotation moments M1, M2, and since the elastic portions 20A on the two sides of the suspension spring 20 have the first elastic line 23 and the second elastic line 24 for accumulating energy and have continuous rebounding force, when the

coils

30, 31 and the magnetic assembly 50 continuously and repeatedly absorb or repel, the suspension spring 20 carrying the optical lens 40 can be repeatedly rotated clockwise and counterclockwise around the virtual axis LX, i.e., the optical lens 40 can be driven to repeatedly move on the plane of the base 10 at a fast speed, thereby improving the quality of the projected pixels and improving the projection effect.

The second embodiment of the present invention is applied to a dual-axis rotary optical actuator, please refer to fig. 6, 7, and 8, wherein the base 10 has the same structure as the above, i.e. a plurality of locking legs 12 are disposed at the corners for conveniently locking the projector (not shown) with locking members (e.g. screws, bolts, rivets, clamps, etc.); the base 10 is further provided with a light hole 11 at the center, the light hole 11 is approximately square in shape matched with the optical lens 40, and a cushion block 13 is respectively arranged at four corners of the edge of the light hole 11 in a pairwise opposite manner, and an inserting column 14 is respectively arranged above the cushion block 13; a convex bearing seat 15 is arranged between every two cushion blocks 13 at the edge of the light hole 11, and an arc-shaped groove which is easy to bear is formed at the top of the bearing seat 15; the base 10 has a slot 16 at the bottom for connection to a circuit board (not shown).

Referring to fig. 8 and 9, a suspension spring 20, which is made of a stamped metal sheet, includes a central frame 200, and the preferred embodiment of the central frame 21 is a square with rounded corners; two opposite corners of the square central frame 21 are respectively provided with an elastic part 20A, the elastic part 20A is provided with a fixed part 21, the fixed part 21 is provided with an insertion hole 22, two sides of the fixed part 21 are respectively provided with a first elastic line 23 and a second elastic line 24, the other ends of the first elastic line 23 and the second elastic line 24 are connected with the central frame 200, and at least one section of

bending part

bending portions

231 and 241 is that the middle position of the first elastic line 23 and the second elastic line 24 are provided with spring structures bent for more than three times continuously, and the suspension elastic sheet 20 forms a

virtual axis

20L and 20L' between the insertion holes 22 on each two opposite elastic portions 20A, respectively, and the corresponding first elastic line 23 (and bending portion 231) and second elastic line 24 (and bending portion 241) are exactly bisected by the two virtual axes 20L and are symmetrical to each other.

Referring to fig. 7 and 8, two sets of four

coils

30, 31, 32, 33, which are opposite to each other in pairs, are respectively disposed at two sets of opposite end edges of the light-transmitting hole 11 of the base 10, and can be exactly disposed on the top arc-shaped grooves of the two bearing seats 15 on the base 10, so as to be more stable.

Referring to fig. 7, 8 and 10, the optical lens 40 has the same structure as that described above, but the magnetic assemblies 50 are two groups of four, that is: the optical lens 40 is provided with a magnetic assembly 50 on each of four sides, the magnetic assembly 50 has a magnetic conductive plate 53, the outer side of the magnetic conductive plate 53 is provided with a first magnet 51 and a second magnet 52 which are vertically arranged, so that the magnetic conductive plate 53, the first magnet 51 and the second magnet 52 form a magnetic ring, and the inner side of the magnetic conductive plate 53 is connected (e.g. bonded) with the optical lens 40; the optical lens 40 is adhered to the upper surface of the central frame 200 of the suspension spring 20, and the suspension spring 20 is sleeved on the plug post 14 of the base 10 through the insertion hole 22 of the fixing portion 21, so that the suspension spring 20 carries the optical lens 40 and the magnetic assembly 50 is mounted on the pad 13 of the base 10.

Referring to fig. 6, 8 and 10, the protective cover 60 has the same structure as the above, the protective cover 60 has a central hole 61, and a plurality of

fastening edges

62, 63 and 64 are respectively disposed at the side edges thereof and can be fastened to the base 10.

In the second embodiment of the present invention, please refer to fig. 6, 7 and 8, the suspension spring plate 20 carries the optical lens 40, and the fixing portions 21 at four corners are respectively sleeved on the corresponding posts 14 on the base 10, so that the suspension spring plate 20 forms a virtual axis LX and a virtual axis LY between two sets of

corresponding coils

30, 31, 32 and 33; when the four

coils

30, 31, 32, 33 are sequentially energized, the suspension spring 20 carrying the optical lens 40 can be sequentially attracted or repelled (as shown by arrows), and the suspension spring 20 carrying the optical lens 40 can be rotated clockwise or counterclockwise by the first elastic line 23 and the second elastic line 24, which accumulate energy, to form the forward or reverse rotational moments M1, M2, M3, M4, respectively, with the two virtual axes LX and the virtual axis LY as axes, so that when the four

coils

30, 31, 32, 33 and the magnetic assembly 50 are continuously attracted or repelled, the suspension spring 20 carrying the optical lens 40 can be repeatedly rotated clockwise or counterclockwise by the two virtual axes LX and the virtual axis LY as axes, which can drive the optical lens 40 to rotate on the plane of the base 10 without being coaxial, or coaxial, Repeated and rapid deflection can further improve the quality of excellent projection pixels and improve the projection effect to be optimal.

The utility model discloses have following a few advantages in the use:

the utility model discloses a base, coil, optical lens piece, magnetic force component, protecting cover all are the same, and suspend in midair the shell fragment and only have two or four elasticity portions's difference, and two or four magnetic force component of cooperation can be changed into unipolar or biax mode completely, and the structure is retrencied and is not taken up the space, and makes the swing more accurate and durable, saves die sinking cost and cost of maintenance, does the utility model discloses a main advantage.

The utility model discloses a can accept in the base more easily on hanging in midair shell fragment and magnetic force component's the cooperation, consequently enable whole optical actuator's volume and reach minimum, use on being particularly suitable for the machines of super miniature projection for cost reduction just does not account for the space, is the utility model discloses a another advantage.

The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. An ultra-miniature projection optical actuator, comprising:

the optical lens comprises a base, a lens, a locking pin, a light hole, a cushion block and an inserting column, wherein the locking pin is arranged at a corner of the base, the light hole is arranged at the center of the base and is square in shape matched with the optical lens, the cushion blocks are oppositely arranged at four corners of the edge of the light hole in pairs respectively, and the inserting column is arranged above the cushion blocks respectively;

the suspension elastic sheet is formed by stamping a metal sheet and comprises a central frame body, wherein each of opposite corners of the central frame body is provided with an elastic part, each elastic part is provided with a fixed part, each fixed part is provided with a jack, two sides of each fixed part are respectively provided with a first elastic line and a second elastic line, one ends of the first elastic lines and the second elastic lines, which are opposite to the fixed parts, are connected with the central frame body, and at least one section of bending part is formed on each first elastic line and each second elastic line; the suspension elastic sheet forms a virtual axis between the jacks on the two elastic parts, and the first elastic line and the bending part thereof, and the second elastic line and the bending part thereof are bisected by the virtual axis and are symmetrical with each other;

at least one group of two opposite coils are respectively arranged at the edges of two opposite ends of the light hole of the base;

the optical lens is provided with a magnetic component at each of two opposite sides, the magnetic component is provided with a magnetic conduction plate, the outer side of the magnetic conduction plate is provided with a first magnet and a second magnet which are arranged up and down, so that the magnetic conduction plate, the first magnet and the second magnet form a magnetic ring, and the inner side surface of the magnetic conduction plate is connected with the optical lens; the optical lens is fixedly connected to the upper surface of the central frame body of the suspension elastic sheet, and the suspension elastic sheet is sleeved on the plug post of the base through the plug hole of the fixing part, so that the suspension elastic sheet bears the optical lens and the magnetic assembly is erected on the cushion block of the base;

the magnetic assembly can form a magnetic force field after being electrified, and attracts the suspension elastic sheet by means of an electromagnetic signal, so that the suspension elastic sheet rotates repeatedly towards angles in two directions respectively by taking the virtual axis as an axis.

2. The micro-miniature projection optical actuator of claim 1, wherein: the base is provided with a convex bearing seat between every two cushion blocks at the edge of the light hole, and the top of the bearing seat forms an arc-shaped groove easy to bear.

3. The micro-miniature projection optical actuator of claim 1, wherein: the base is provided with a wire slot below, and the base is connected with the circuit board by virtue of a connecting wire penetrating through the wire slot.

4. The micro-miniature projection optical actuator of claim 1, wherein: the bending parts of the first elastic line and the second elastic line of the suspension elastic sheet are spring structure bodies which are continuously bent for three times.

5. The micro-miniature projection optical actuator of claim 1, wherein: a protecting cover is arranged above the base of the suspension spring plate, the protecting cover is provided with a central hole, and a plurality of buckling edges are respectively arranged on the side edges to be buckled on the base.

6. An ultra-miniature projection optical actuator, comprising:

a base, which is provided with locking legs at the corners and a light hole at the center, wherein the light hole is approximately square by matching the shape of the optical lens, and the four corners at the edge of the light hole are respectively provided with a cushion block in a pairwise opposite manner, and an inserting column is respectively arranged above the cushion block;

the suspension elastic sheet is formed by stamping a metal sheet and comprises a central frame body, two opposite corners of the central frame body are respectively provided with an elastic part, the elastic part is provided with a fixed part, the fixed part is provided with a jack, two sides of the fixed part are respectively provided with a first elastic line and a second elastic line, one ends of the first elastic line and the second elastic line, which are opposite to the fixed part, are connected with the central frame body, and at least one section of bending part is formed on the first elastic line and the second elastic line; the suspension elastic sheet forms a virtual axis between the jacks on each two opposite elastic parts, and the first elastic line and the second elastic line are bisected by the two virtual axes and are symmetrical with each other;

two groups of four coils which are opposite in pairs are respectively arranged at two groups of opposite end edges of the light hole of the base;

the optical lens is provided with a magnetic component on each of four side edges, the magnetic component is provided with a magnetic conduction plate, the outer side of the magnetic conduction plate is provided with a first magnet and a second magnet which are arranged up and down, so that the magnetic conduction plate, the first magnet and the second magnet form a magnetic ring, and the inner side surface of the magnetic conduction plate is connected with the optical lens; the optical lens is fixedly connected to the upper surface of the central frame body of the suspension elastic sheet, and the suspension elastic sheet is sleeved on the plug post of the base through the plug hole of the fixing part, so that the suspension elastic sheet bears the optical lens and the magnetic assembly is erected on the cushion block of the base;

the four magnetic assemblies can form a magnetic force field after being electrified, and attract the suspension elastic sheet by means of electromagnetic signals, so that the suspension elastic sheet respectively takes two virtual axes as axes and rotates towards the angles in two directions repeatedly in turn.

7. The micro-miniature projection optical actuator of claim 6, wherein: the base is provided with a convex bearing seat between every two cushion blocks at the edge of the light hole, and the top of the bearing seat forms an arc-shaped groove easy to bear.

8. The micro-miniature projection optical actuator of claim 6, wherein: the base is provided with a wire slot below, and the base is connected with the circuit board by virtue of a connecting wire penetrating through the wire slot.

9. The micro-miniature projection optical actuator of claim 6, wherein: the bending parts of the first elastic line and the second elastic line of the suspension elastic sheet are spring structure bodies which are continuously bent for three times.

10. The micro-miniature projection optical actuator of claim 6, wherein: a protecting cover is arranged above the base of the suspension spring plate, the protecting cover is provided with a central hole, and a plurality of buckling edges are respectively arranged on the side edges to be buckled on the base.