CN215067699U

CN215067699U - Projection light machine

Info

Publication number: CN215067699U
Application number: CN202121522403.4U
Authority: CN
Inventors: 王帅; 赵云
Original assignee: Goertek Optical Technology Co Ltd
Current assignee: Goertek Optical Technology Co Ltd
Priority date: 2021-06-30
Filing date: 2021-06-30
Publication date: 2021-12-07
Anticipated expiration: 2031-06-30

Abstract

The utility model discloses a projection ray apparatus, include: the projection imaging system is used for emitting a projection light beam; the first lens group is arranged at the emergent end of the projection imaging system; the second lens group is arranged at the emergent end of the projection imaging system, and the optical axis of the second lens group is crossed with the optical axis of the first lens group; the reflector is used for reflecting the projection light beam; the driving device comprises a rotary driving piece, a transmission assembly and a rotating shaft, an output shaft of the rotary driving piece is connected with the rotating shaft through the transmission assembly, and the reflector is fixedly arranged on the rotating shaft; the rotary driving member drives the rotating shaft to rotate through the transmission assembly so as to drive the reflector to rotate, so that the projection light beam is emitted through the first lens group or the second lens group. The utility model discloses technical scheme can realize wall projection or desktop projected difunctional through the position of automatic adjustment speculum, satisfies the different user demands of user.

Description

Projection light machine

Technical Field

The utility model relates to a projection equipment field, in particular to projection ray apparatus.

Background

With the development of the micro projector technology, the home projectors are increasingly coming into the field of vision of people and are moving toward miniaturization and portability. At present, the application of the household projector mainly comprises two aspects of audio-visual entertainment and education and teaching. The projector for audio-video entertainment generally has a larger projection ratio, and the projector with the larger projection ratio has higher cost performance because the design difficulty and the manufacturing cost of the projector are relatively lower; the projector used for the aspect of education and teaching generally adopts a desktop projection mode, 20 cm of pictures are projected on a desktop at the height of about 40 cm, and the required projection is small at the moment.

Along with the increase of user's demand, the user needs to use the audio-visual amusement function of projector under some circumstances, needs to use the educational and teaching function of projector under other circumstances, for this reason, the user can only purchase the projector of two kinds of different functions simultaneously, and this kind of mode occupies space, resource-wasting, and it is not convenient enough to use two times. Therefore, it is increasingly difficult for a single-function projector to meet the needs of modern users.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a projection ray apparatus, aim at the position through the automatic adjustment speculum, make projection light beam penetrate first lens group and jet out or see through the second lens group and jet out, realize wall projection or desktop projected difunctional, satisfy the user demand that the user is different.

In order to achieve the above object, the utility model provides a projection ray apparatus, include: the projection imaging system is used for emitting a projection light beam; the first lens group is arranged at the emergent end of the projection imaging system; the second lens group is arranged at the emergent end of the projection imaging system, and the optical axis of the second lens group is crossed with the optical axis of the first lens group; the reflector is used for reflecting the projection light beam; the driving device comprises a rotary driving piece, a transmission assembly and a rotating shaft, an output shaft of the rotary driving piece is connected with the rotating shaft through the transmission assembly, and the reflector is fixedly arranged on the rotating shaft; the rotary driving part drives the rotating shaft to rotate through the transmission assembly so as to drive the reflector to rotate, and the projection light beam is emitted through the first lens group or the second lens group.

Optionally, the transmission assembly comprises: the first gear is sleeved on the output shaft of the rotary driving piece; the second gear is sleeved on the rotating shaft and meshed with the first gear.

Optionally, the transmission assembly comprises: the first belt pulley is sleeved on the output shaft of the rotary driving part; the second belt pulley is sleeved on the rotating shaft; the belt is sleeved on the first belt pulley and the second belt pulley.

Optionally, the transmission assembly comprises: the first chain wheel is sleeved on the output shaft of the rotary driving part; the second chain wheel is sleeved on the rotating shaft; the chain is sleeved on the first chain wheel and the second chain wheel.

Optionally, the driving device further comprises: the backup pad, the backup pad with pivot fixed connection, the speculum with the backup pad laminating sets up.

Optionally, an optical axis of the first lens group coincides with an optical axis of the projection beam; when the reflector is at the first position, the projection light beam is emitted out through the first lens group; when the reflector is at the second position, the projection beam mirror is reflected by the reflector and then emitted out through the second lens group.

Optionally, the mirror is a total reflection mirror; or, the reflector is a half-mirror, and when the half-mirror is in the second position, the projection beam is transmitted by the half-mirror and then is emitted out through the first lens group.

Optionally, the driving device further comprises: the first sensed piece is fixedly arranged on the reflector; the first sensor is positioned at one side of the reflector, and when the reflector is positioned at the first position, the first sensed part is positioned in the sensing range of the first sensor; the second sensor and the first sensor are arranged along the circumferential direction of the rotating shaft, and when the reflecting mirror is at the second position, the first sensed part is positioned in the sensing range of the second sensor.

Optionally, the optical axis of the first lens group, the optical axis of the second lens group and the optical axis of the projection beam intersect at the same point; when the reflector is in the third position, the projection light beam is reflected by the reflector and then emitted out through the first lens group; when the reflector is in the fourth position, the projection beam mirror is reflected by the reflector and then emitted out through the second lens group.

Optionally, the driving device further comprises: the second sensed piece is fixedly arranged on the reflector; the third sensor is positioned at one side of the reflector, and when the reflector is positioned at the third position, the second sensed part is positioned in the sensing range of the third sensor; the third inductor and the fourth inductor are arranged along the circumferential direction of the rotating shaft, and when the reflecting mirror is at the fourth position, the second induced part is positioned in the induction range of the fourth inductor.

In the technical scheme of the utility model, a driving device and a reflector are arranged between a projection imaging system and a first lens group/a second lens group, the driving device comprises a rotary driving piece, a transmission component and a rotating shaft, an output shaft of the rotary driving piece is connected with the rotating shaft through the transmission component, the reflector is fixedly arranged on the rotating shaft, the rotary driving piece drives the rotating shaft to rotate through the transmission component so as to drive the reflector to rotate, the automatic adjustment of the rotation of the reflector can be realized, whether the projection light beam is reflected or the reflection angle of the projection light beam is determined through the position change of the reflector, the projection light beam is enabled to be emitted through the first lens group or the second lens group, thereby the effect of wall projection or desktop projection is achieved, the dual functions of wall projection or desktop projection are realized on the same projection light machine, and the use requirements of users on entertainment audio and education in two aspects can be met, and first lens group and second lens group share one set of projection imaging system, can effectively reduce the whole volume of projection ray apparatus, and simple structure is compact, and it is nimble convenient to use.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of a projection optical apparatus according to the present invention;

FIG. 2 is a schematic diagram of a driving device of the optical projection engine of FIG. 1;

FIG. 3 is a schematic diagram of the optical projection engine of FIG. 1 with a reflector in a first position;

FIG. 4 is a schematic diagram of the optical projection engine of FIG. 1 with a mirror in a second position;

fig. 5 is a schematic structural diagram of another embodiment of the projection optical device of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Projection light machine	52	First gear
10	Projection imaging system	53	Second gear
				20	First lens group	54	Rotating shaft
30	Second lens group	55	Supporting plate
				40	Reflecting mirror	56	First sensed piece
50	Drive device	57	First inductor
				51	Rotary driving member	58	Second inductor

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides a projection ray apparatus 100.

In the embodiment of the present invention, as shown in fig. 1 to 4, the projection optical machine 100 includes: a projection imaging system 10, a first lens group 20, a second lens group 30, a mirror 40 and a driving device 50, the projection imaging system 10 being for emitting a projection light beam; the first lens group 20 is arranged at the exit end of the projection imaging system 10; the second lens group 30 is disposed at the exit end of the projection imaging system 10, and the optical axis of the second lens group 30 intersects with the optical axis of the first lens group 20; the reflector 40 is used for reflecting the projection light beam; the driving device 50 comprises a rotary driving member 51, a transmission assembly and a rotating shaft 54, an output shaft of the rotary driving member 51 is connected with the rotating shaft 54 through the transmission assembly, and the reflector 40 is fixedly arranged on the rotating shaft 54; the rotary driving member 51 drives the rotating shaft 54 to rotate through the transmission assembly, so as to drive the reflector 40 to rotate, so that the projection light beam is emitted through the first lens group 20 or the second lens group 30.

Specifically, the focal length of the first lens group 20 is between 25 mm and 30 mm, and the focal length of the second lens group 30 is between 3.2 mm and 3.5 mm, that is, the first lens group 20 is a long-focus lens group, and the second lens group 30 is a short-focus lens group. At this time, the focal length of the first lens group 20 is different from the focal length of the second lens group 30, and the projection ratio of the first lens group 20 and the second lens group 30 when imaging the projection light beam is different, so that different projection effects can be realized. Of course, the first lens group 20 can be set as a short focal lens group, and the second lens group 30 can be set as a long focal lens group, which is not limited by the present invention, and the focal lengths of the first lens group 20 and the second lens group 30 can be set according to actual needs. For convenience of description, the first lens group 20 is exemplified as a long focus lens group and the second lens group 30 is exemplified as a short focus lens group. The detailed structures of the projection imaging system 10, the first lens group 20 and the second lens group 30 can be implemented by the prior art, and are not described herein again.

It will be readily appreciated that the mirror 40 may reflect the projection beam exiting the projection image, thereby changing the direction of propagation of the projection beam. Meanwhile, the reflector 40 can move relative to the projection imaging system 10 to determine whether to reflect the projection beam or determine the reflection angle of the projection beam, so as to select the projection beam to be emitted through the first lens group 20 or the second lens group 30. Wherein, because the focal length of the first lens group 20 is longer, when the projection light beam is emitted through the first lens group 20, the projection ratio of the optical imaging is larger, at this time, the optical imaging can be projected on the wall surface for the video entertainment; the second lens group 30 has a short focal length, so that when the projection beam is emitted through the second lens group 30, the projection of the optical image is small, and at this time, the optical image can be projected on a desktop for educational teaching.

In this embodiment, the mirror 40 is controlled to rotate by the driving device 50. Specifically, the optical projection engine 100 further includes a housing (not shown), the projection imaging system 10, the first lens set 20 and the second lens set 30 are all fixed in the housing, the rotary driving member 51 is also fixed in the housing, and an output shaft of the rotary driving member 51 is connected to the rotating shaft 54 through a transmission assembly. The rotary driving member 51 can be a motor, and the rotary driving member 51 drives the reflector 40 to rotate counterclockwise or clockwise by driving the transmission assembly to selectively eject the projection beam through the first lens group 20 or the second lens group 30, thereby finally realizing the wall projection or desktop projection.

As an alternative embodiment, referring to fig. 1 to 4, the transmission assembly includes: a first gear 52 and a second gear 53, wherein the first gear 52 is sleeved on the output shaft of the rotary driving member 51; the second gear 53 is sleeved on the rotating shaft 54, and the second gear 53 is meshed with the first gear 52.

In this embodiment, the transmission mode is gear transmission. When the rotary driving member 51 drives the first gear 52 to rotate, the rotating shaft 54 is driven to rotate in a forward direction or a reverse direction by the engagement between the first gear 52 and the second gear 53, so as to drive the reflector 40 to rotate counterclockwise or clockwise, so as to determine that the projection beam is emitted through the first lens group 20 or emitted through the second lens group 30, and finally realize the wall projection or desktop projection effect. The gear transmission has the characteristics of compact structure, high efficiency, long service life and the like.

As an alternative embodiment, the transmission assembly comprises: the first belt pulley is sleeved on an output shaft of the rotary driving part 51; the second belt pulley is sleeved on the rotating shaft 54; the belt is sleeved on the first belt pulley and the second belt pulley.

In this embodiment, the transmission mode is belt transmission. When the first belt pulley is driven to rotate by the rotary driving member 51, the second belt pulley is driven to rotate synchronously to drive the rotating shaft 54 to rotate in a forward direction or a reverse direction, so as to drive the reflector 40 to rotate counterclockwise or clockwise, so as to determine that the projection beam is emitted through the first lens group 20 or emitted through the second lens group 30, and finally realize the wall projection or desktop projection effect. The belt has good elasticity, so that the belt transmission can alleviate impact and vibration in work, and the belt transmission is stable in motion and free of noise.

As an alternative embodiment, the transmission assembly comprises: the first chain wheel is sleeved on an output shaft of the rotary driving part 51; the second chain wheel is sleeved on the rotating shaft 54; the chain is sleeved on the first chain wheel and the second chain wheel.

In this embodiment, the transmission mode is chain transmission. When the first chain wheel is driven to rotate by the rotary driving member 51, the second chain wheel is driven to rotate synchronously by the chain to drive the rotating shaft 54 to rotate positively or reversely, so as to drive the reflector 40 to rotate counterclockwise or clockwise, to determine whether the projection beam is emitted through the first lens group 20 or the second lens group 30, and finally realize the wall projection or desktop projection effect. The chain transmission can keep accurate average transmission ratio, has higher transmission efficiency, does not skid and has reliable transmission.

In an embodiment of the present invention, referring to fig. 1 to 4, the driving device 50 further includes: and the supporting plate 55, the supporting plate 55 and the rotating shaft 54 are fixedly connected, and the reflector 40 and the supporting plate 55 are attached.

In this embodiment, in order to avoid the damage of other components to the structure of the reflector 40, a supporting plate 55 is additionally provided, the reflector 40 is attached to the surface of the supporting plate 55, and the rotating shaft 54 penetrates through the left end of the supporting plate 55. Thus, when the rotary driving member 51 drives the rotating shaft 54 to rotate forward or backward through the transmission assembly, the supporting plate 55 is driven to rotate clockwise or counterclockwise, so that the reflector 40 can rotate synchronously with the supporting plate 55, thereby ensuring effective control of the rotation of the reflector 40, and further, the structural strength of the reflector 40 can be enhanced through the supporting plate 55.

In an embodiment of the present invention, referring to fig. 1 to 4, an optical axis of the first lens group 20 coincides with an optical axis of the projection beam; when the reflector 40 is at the first position, the projection beam is emitted through the first lens group 20; when the reflector 40 is at the second position, the projection beam mirror is reflected by the reflector 40 and then exits through the second lens group 30.

In this technical solution, the first position of the reflector 40 can be flexibly set, and as long as the reflector 40 does not block the light path through which the projection light beam passes when being transmitted through the first lens group, the relevant position can be included in the range of the first position (of course, the movable range of the reflector 40 is limited in the rotating direction with the rotating shaft 54 as the center of circle); when the reflector 40 is at the first position, the projection beam is directly emitted through the first lens group 20 without passing through the reflector 40. The second position of the reflector 40 is relatively fixed, the second position is the position where the reflector 40 reflects the projection light beam to the second lens group 30, the second position should be the position where the reflector 40 is located at the intersection of the optical axis of the first lens group 20 and the optical axis of the second lens group 30, and the plane of the reflector 40 is perpendicular to the symmetrical center line of the optical axis of the first lens group 20 and the optical axis of the second lens group 30; when the reflector 40 is at the second position, the projection beam irradiates on the reflector 40, and the propagation path of the projection beam is turned by the reflection of the reflector 40, so as to be emitted through the second lens group 30. It is understood that the intersection point of the optical axis of the first lens group 20 and the optical axis of the second lens group 30 should be located between the exit end of the projection imaging system 10 and the first lens group 20. For rotation convenience, the rotation shaft 54 may be perpendicular to the plane where the optical axis of the first lens group 20 and the optical axis of the second lens group 30 lie.

Further, the mirror 40 is a total reflection mirror 40; or, the reflector 40 is a half mirror 40, and when the half mirror 40 is located at the second position, the projection light beam is further transmitted through the half mirror 40 and then emitted out through the first lens group 20.

The mirror 40 can be classified as a total reflection mirror 40 (100% reflection) or a half reflection mirror 40 (also called a spectroscope or a beam splitter, X% transmission, 100-X% reflection) according to the degree of reflection of the mirror 40. When the set reflector 40 is the total reflection reflector 40, the optical projector 100 has the dual functions of wall projection or desktop projection, and the user can select one of the functions to use as required: specifically, when the driving device 50 controls the total reflection mirror 40 to rotate to the first position, the wall surface projection effect can be realized; when the driving device 50 controls the total reflection mirror 40 to rotate to the second position, the effect of desktop projection can be achieved. When the reflector 40 that sets up is half-transmitting half-reflecting mirror 40, projection ray apparatus 100 has the difunctional of wall projection or desktop projection to, the user can use wall projection and desktop projection function simultaneously as required: specifically, when the driving device 50 controls the half mirror 40 to rotate to the first position, the wall surface projection effect can be realized; when the driving device 50 controls the half mirror 40 to rotate to the second position, the wall projection and the desktop projection can be simultaneously performed. Of course, in order to ensure the transmission effect of the half mirror 40, the supporting plate 55 should be made of a transparent material, or the supporting plate 55 is set to have a hollow structure corresponding to the half mirror 40.

Further, referring to fig. 1 to 4, the driving device 50 further includes: a first sensed member 56, a first sensor 57 and a second sensor 58, wherein the first sensed member 56 is fixed on the reflector 40; the first sensor 57 is located at one side of the reflector 40, and when the reflector 40 is at the first position, the first sensed part 56 is located within the sensing range of the first sensor 57; the second sensor 58 and the first sensor are arranged along the circumferential direction of the rotating shaft 54, and when the reflecting mirror 40 is at the second position, the first sensed part 56 is located within the sensing range of the second sensor 58.

In this embodiment, the position of the reflector 40 can be identified through the cooperation of the first sensed member 56, the first sensor 57 and the second sensor 58, so as to determine what function mode the projector 100 is in. Specifically, the first inductor 57 and the second inductor 58 may be photoelectric sensors, each of the first inductor 57 and the second inductor 58 includes a transmitting end and a receiving end that are disposed opposite to each other, and the first inductor 57 and the second inductor 58 are fixed in the housing. When the driving device 50 controls the reflector 40 to rotate to the first position, the first sensed part 56 enters the sensing groove formed between the emitting end and the receiving end of the first sensor 57, the detection light emitted by the emitting end of the first sensor 57 is blocked by the first sensed part 56, the receiving end of the first sensor 57 cannot receive the detection light emitted by the emitting end of the first sensor 57, at this time, the first sensor 57 outputs a corresponding first sensing signal to the controller of the projection light machine 100, and the controller recognizes that the reflector 40 is at the first position accordingly; similarly, when the driving device 50 controls the reflector 40 to rotate to the second position, the second first sensed part 56 enters the sensing groove formed between the emitting end and the receiving end of the second sensor 58, the detecting light emitted from the emitting end of the second sensor 58 is blocked by the second first sensed part 56, the receiving end of the second sensor 58 cannot receive the detecting light emitted from the emitting end of the second sensor 58, at this time, the second sensor 58 outputs a corresponding second sensing signal to the controller of the projection light machine 100, and the controller recognizes that the reflector 40 is at the second position accordingly. When the functional mode needs to be switched, the controller may determine to control the mirror 40 to rotate in which direction according to the identified current position of the mirror 40, thereby completing the switching of the functional mode of the optical projection engine 100.

In an embodiment of the present invention, referring to fig. 5, the optical axis of the first lens group 20, the optical axis of the second lens group 30 and the optical axis of the projection beam intersect at the same point; when the reflector 40 is at the third position, the projection beam is reflected by the reflector 40 and then emitted through the first lens group 20; when the reflector 40 is at the fourth position, the projection beam mirror is reflected by the reflector 40 and then exits through the second lens group 30.

In this embodiment, the third position of the reflector 40 should be that the reflector 40 is located at the intersection of the optical axis of the first lens group 20 and the optical axis of the second lens group 30, and the plane of the reflector 40 is perpendicular to the symmetric center line of the optical axis of the projection beam and the optical axis of the first lens group 20; when the mirror 40 is at the third position, the projection beam irradiates the mirror 40, and the propagation path of the projection beam is turned by the reflection of the mirror 40, so as to be emitted through the first lens group 20. The fourth position of the mirror 40 should be such that the mirror 40 is located at the intersection of the optical axis of the first lens group 20 and the optical axis of the second lens group 30 and the plane of the mirror 40 is perpendicular to the center line of symmetry of the optical axis of the projection light beam and the optical axis of the second lens group 30; when the reflector 40 is at the fourth position, the projection beam irradiates the reflector 40, and the propagation path of the projection beam is turned by the reflection of the reflector 40, so as to be emitted through the second lens group 30. In the present embodiment, the reflecting mirror 40 is preferably a total reflecting mirror 40.

Further, the driving device 50 further includes: the second sensed piece, the third sensor and the fourth sensor are fixedly arranged on the reflector 40; the third sensor is positioned at one side of the reflector 40, and when the reflector 40 is at the third position, the second sensed part is positioned in the sensing range of the third sensor; the third sensor and the fourth sensor are arranged along the circumferential direction of the rotating shaft 54, and when the reflecting mirror 40 is at the fourth position, the second sensed part is located in the sensing range of the fourth sensor.

In this embodiment, the position of the reflector 40 can be identified through the cooperation of the second sensed object, the third sensor and the fourth sensor, so as to determine what function mode the optical projection engine 100 is in. When the driving device 50 controls the reflector 40 to rotate to the first position, the second sensed object enters the sensing range of the third sensor, the third sensor outputs a corresponding first sensing signal to the controller of the optical projection engine 100, and the controller recognizes that the reflector 40 is at the first position accordingly; similarly, when the driving device 50 controls the mirror 40 to rotate to the second position, the second sensed object enters the sensing range of the fourth sensor, and the fourth sensor outputs a corresponding second sensing signal to the controller of the light engine 100, so that the controller recognizes that the mirror 40 is at the second position. When the functional mode needs to be switched, the controller can determine to control the supporting plate 55 to rotate in which direction according to the identified current position of the reflector 40, thereby completing the switching of the functional mode of the optical projector 100.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.

Claims

1. A projection light engine, comprising:

a projection imaging system for emitting a projection beam;

the first lens group is arranged at the emergent end of the projection imaging system;

the second lens group is arranged at the emergent end of the projection imaging system, and the optical axis of the second lens group is crossed with the optical axis of the first lens group;

a mirror for reflecting the projection beam;

the driving device comprises a rotary driving piece, a transmission assembly and a rotating shaft, an output shaft of the rotary driving piece is connected with the rotating shaft through the transmission assembly, and the reflector is fixedly arranged on the rotating shaft; the rotary driving part drives the rotating shaft to rotate through the transmission assembly so as to drive the reflector to rotate, and the projection light beam is emitted through the first lens group or the second lens group.

2. The light engine of claim 1, wherein the drive assembly comprises:

the first gear is sleeved on the output shaft of the rotary driving piece;

and the second gear is sleeved on the rotating shaft and is meshed with the first gear.

3. The light engine of claim 1, wherein the drive assembly comprises:

the first belt pulley is sleeved on the output shaft of the rotary driving part;

the second belt pulley is sleeved on the rotating shaft;

the belt is sleeved on the first belt pulley and the second belt pulley.

4. The light engine of claim 1, wherein the drive assembly comprises:

the first chain wheel is sleeved on the output shaft of the rotary driving piece;

the second chain wheel is sleeved on the rotating shaft;

the chain is sleeved on the first chain wheel and the second chain wheel.

5. The light engine of claim 1, wherein the drive means further comprises:

the backup pad, the backup pad with pivot fixed connection, the speculum with the backup pad laminating sets up.

6. The projection optical engine of any of claims 1 to 5, wherein an optical axis of the first lens group coincides with an optical axis of the projection beam;

when the reflector is at the first position, the projection light beam is emitted out through the first lens group; when the reflector is at the second position, the projection beam mirror is reflected by the reflector and then emitted out through the second lens group.

7. The light engine of claim 6, wherein the mirror is a total reflection mirror;

or, the reflector is a half-mirror, and when the half-mirror is in the second position, the projection beam is transmitted by the half-mirror and then is emitted out through the first lens group.

8. The light engine of claim 7, wherein the drive means further comprises:

the first sensed piece is fixedly arranged on the reflector;

the first sensor is positioned on one side of the reflector, and when the reflector is positioned at the first position, the first sensed piece is positioned in the sensing range of the first sensor;

the second inductor, the second inductor and the first inductor are arranged along the circumferential direction of the rotating shaft, and when the reflecting mirror is at the second position, the first inductor is positioned in the induction range of the second inductor.

9. The projection optical machine of any of claims 1 to 5, wherein the optical axis of the first lens group, the optical axis of the second lens group and the optical axis of the projection beam intersect at the same point;

when the reflector is in the third position, the projection light beam is reflected by the reflector and then emitted out through the first lens group; when the reflector is in the fourth position, the projection beam mirror is reflected by the reflector and then emitted out through the second lens group.

10. The light engine of claim 9, wherein the drive means further comprises:

the second sensed piece is fixedly arranged on the reflector;

the third sensor is positioned on one side of the reflector, and when the reflector is positioned at the third position, the second sensed part is positioned in the sensing range of the third sensor;

and the third inductor and the fourth inductor are arranged along the circumferential direction of the rotating shaft, and when the reflecting mirror is at the fourth position, the second inducted part is positioned in the induction range of the fourth inductor.