Rotating structure and projector

Abstract

The invention discloses a rotating structure and a projector, and relates to the technical field of imaging device.The rotating structure comprises a rotating part, a driving assembly and a photoelectric sensor, a blocking piece extending in the circumferential direction of the rotating part is arranged on the side wall of one end of the rotating part, a plurality of light holes are formed in the blocking piece at intervals in the extending direction of the blocking piece, and the photoelectric sensor comprises a transmitting end and a receiving end; the transmitting end and the receiving end are arranged at an interval to form a gap, the blocking piece penetrates through the gap, the transmitting end is used for transmitting light, the receiving end is used for receiving light transmitted along the light guide path, the light guide path passes through the gap, and the driving assembly is used for driving the rotating part to rotate. According to the number of times of receiving the light, the rotation angle of the rotating part can be accurately judged, and even if the problems of return difference, step loss and the like are generated by the driving assembly, the rotation angle of the rotating part can still be calculated through the number of times of receiving the light, so that the positioning precision of the rotating part is improved, and the focusing precision of the lens is further improved; and the imaging effect of the projector is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of imaging equipment, and in particular to a rotating structure and a projector. Background Art

[0002] With the development of micro-projector technology, more and more home projectors have entered people's field of vision, and are developing in the direction of miniaturization and portability. The portability of micro-projectors determines that the distance between the projector and the screen is often changing. In order to meet this change, the optical machine lens needs to be focused so that the projected image is clear at different distances.

[0003] In the prior art, micro projectors mainly use stepper motors for automatic focusing of the optical machine lens. The automatic focusing process is to first let the stepper motor return to the starting point, obtain the distance between the lens and the screen according to the distance sensor, and then control the number of forward movement of the stepper motor according to the correspondence between the number of forward movement and the distance set in advance, and control the number of forward movement of the stepper motor to drive the lens to move. Then, the method of controlling the number of stepper motor movement is an open-loop method, which cannot eliminate the influence of the stepper motor's hysteresis, step loss, etc., which will lead to insufficient focusing accuracy of the optical machine lens and poor imaging effect of the projector. Summary of the invention

[0004] The main purpose of the present invention is to propose a rotating structure and a projector, aiming to solve the problem in the prior art that focusing by a stepper motor leads to insufficient focusing accuracy of the optical machine lens and poor imaging effect of the projector.

[0005] To achieve the above object, the rotating structure proposed by the present invention includes:

[0006] A rotating member, wherein a baffle extending along its circumferential direction is arranged on the side wall of the rotating member, and the baffle is provided with a plurality of light-transmitting holes spaced apart along its extending direction;

[0007] A photoelectric sensor, the photoelectric sensor comprising a transmitting end and a receiving end, the transmitting end and the receiving end are arranged at intervals to form a gap, the baffle is arranged in the gap, the transmitting end is used to emit light, and the receiving end is used to receive the light propagating along a light guide path, and the light guide path passes through the gap;

[0008] A driving assembly is used to drive the rotating member to rotate so that the multiple light-transmitting holes of the baffle plate are connected to the light-guiding path in sequence, and the area between any two adjacent light-guiding holes on the baffle plate is used to cut off the light-guiding path.

[0009] In one embodiment, the rotating member rotates around its axis, the plurality of light-transmitting holes are evenly spaced, and the plurality of light-transmitting holes are radially distributed about the axis of the rotating member.

[0010] In one embodiment, the rotating member is a circular rotating cylinder, and the light-transmitting hole extends along the radial direction of the rotating member to form a long strip-shaped hole.

[0011] In one embodiment, the blocking piece is an arc-shaped blocking piece extending along the circumference of the rotating member, and the extension length of the blocking piece is smaller than the circumference of the rotating member.

[0012] In one embodiment, the plurality of light-transmitting holes have the same shape and size, and a line connecting the centroid of each light-transmitting hole and the center of the rotating member is a symmetry axis, and each light-transmitting hole is symmetrically arranged along the corresponding symmetry axis.

[0013] In one embodiment, a rack is provided on the outer side wall of the rotating member along its circumference, and the driving assembly includes a driving member and a gear connected to the output shaft of the driving member, the gear is meshed with the rack, and the driving member is used to drive the gear to rotate, so as to drive the rotating member to rotate through the rack.

[0014] In one embodiment, the distance between the centroids of any two adjacent light-transmitting holes is a hole pitch A, and the tooth pitch of the rack is B, wherein b=xA, and x is a positive integer greater than or equal to 1.

[0015] In one embodiment, the rack and the blocking piece are spaced apart in the axial direction of the rotating member and staggeredly distributed in the circumferential direction of the rotating member.

[0016] The present invention also proposes a projector, wherein the lens includes a shell, a lens body and the above-mentioned rotating structure, the lens body is installed on the rotating part, a curved groove extending along its circumference is opened on the outside of the side wall of the rotating part, and the two ends of the curved groove are arranged at intervals along the axial direction of the rotating part, and an abutment member for slidingly contacting with the curve is provided on the shell, the driving assembly drives the rotating part to rotate to drive the lens body to rotate, and the lens body is driven to move along the axial direction of the rotating part through the cooperation of the curved groove and the abutment member.

[0017] In one embodiment, a plurality of engaging holes spaced apart along the circumference of the rotating member are formed on the side wall of the rotating member, the engaging holes are spaced apart from the blocking piece, and the engaging holes are used for engaging with the lens body.

[0018] The technical solution of the present invention is to set a baffle on the side wall of the rotating part, and the baffle extends along the circumferential direction of the rotating part. When the driving component drives the rotating part to rotate, the baffle rotates with the rotating part, and the baffle is located in the gap. The transmitting end continuously emits light. When the baffle rotates to the point where the light-transmitting hole on it corresponds to the transmitting end, the light-guiding path is turned on, and the light emitted by the transmitting end passes through the light-transmitting hole through the light-guiding path and enters the receiving end. The receiving end detects the light once. As the rotating part and the baffle continue to rotate, the area between any two adjacent light-transmitting holes corresponds to the transmitting end, and the light-guiding path is cut off. At this time, the light emitted by the transmitting end is blocked, and the receiving end cannot receive the light. Therefore, as the rotating part continues to rotate, the light-guiding path will be turned on every time the rotating part rotates a certain angle, and the receiving end will receive the light. According to the number of times the light is received, the rotation angle of the rotating part can be accurately determined. Even if the driving component has problems such as hysteresis and step loss, the rotation angle of the rotating part can still be calculated by the number of times the light is received, thereby improving the positioning accuracy of the rotating part, thereby improving the focusing accuracy of the lens, and improving the imaging effect of the projector. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 A schematic structural diagram of an embodiment of a rotating structure provided by the present invention;

[0021] Figure 2 A schematic diagram of an exploded structure of an embodiment of a rotating structure provided by the present invention;

[0022] Figure 3 A schematic diagram of a partial structure of a rotating structure provided by the present invention;

[0023] Figure 4 A schematic structural diagram of a driving assembly of a rotating structure provided by the present invention.

[0024] Description of Figure Numbers:

[0025] 100. Rotating structure; 1. Rotating member; 11. Blocking piece; 12. Light-transmitting hole; 13. Rack; 14. Snap-in hole; 2. Driving assembly; 21. Driving member; 22. Gear; 3. Photoelectric sensor; 31. Transmitting end; 32. Receiving end.

[0026] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] In the prior art, micro projectors mainly use stepper motors for automatic focusing of optical machine lenses. The automatic focusing process is to first let the motor return to the starting point, obtain the distance between the lens and the screen according to the distance sensor, and then control the number of forward movement of the stepper motor according to the correspondence between the number of forward movement and the distance set in advance, and control the number of forward movement of the stepper motor to drive the lens to move. Then, the method of controlling the number of stepper motor movement cannot eliminate the influence of the stepper motor's hysteresis, step loss, etc., which will lead to insufficient focusing accuracy of the optical machine lens and poor imaging effect of the projector.

[0031] In order to solve the above problems, the present invention provides a rotating structure 100 .

[0032] Please combine Figures 1 to 4In one embodiment of the present invention, the rotating structure 100 includes a rotating member 1, a driving assembly 2 and a photoelectric sensor 3. A baffle 11 extending along its circumferential direction is provided on the side wall of the rotating member 1. The baffle 11 is provided with a plurality of light-transmitting holes 12 spaced apart along its extending direction. The photoelectric sensor 3 includes a transmitting end 31 and a receiving end 32. The transmitting end 31 and the receiving end 32 are spaced apart to form a gap. The baffle 11 is penetrated in the gap. The transmitting end 31 is used to emit light, and the receiving end 32 is used to receive light propagating along a light guide path. The light guide path passes through the gap. The driving assembly 2 is used to drive the rotating member 1 to rotate so that the plurality of light-transmitting holes 12 of the baffle 11 are connected to the light guide path in sequence. The area between any two adjacent light guide holes 12 on the baffle 11 is used to cut off the light guide path.

[0033] It can be understood that the rotating member 1 can be any columnar structure, preferably a circular ring or a cylindrical shape. The photoelectric sensor 3 is an optical coupler, which is used to generate a high level when receiving light and a low level when there is no light, so as to judge the number of light-transmitting holes 12 passing through by the high level signal and the low level signal, thereby judging the rotation angle. Specifically, the driving component can be a rotating driving member in the prior art, such as a motor, a motor, a turbine, etc.

[0034] The technical solution of the present invention is to set a baffle 11 on the side wall of the rotating member 1, and the baffle 11 extends along the circumference of the rotating member 1. When the driving component 2 drives the rotating member 1 to rotate, the baffle 11 rotates with the rotating member 1. The baffle 11 is located in the gap, and the emitting end 31 continues to emit light. When the baffle 11 rotates to the point where the light-transmitting hole 12 on it corresponds to the emitting end 31, the light guide path is turned on, and the light emitted by the emitting end 31 passes through the light guide path and the light-transmitting hole 12 and enters the receiving end 32. The receiving end 32 detects the light once, and as the rotating member 1 and the baffle 11 continue to rotate, the area between any two adjacent light-transmitting holes 12 Corresponding to the transmitting end 31, the light guide path is cut off. At this time, the light emitted by the transmitting end 31 is blocked, and the receiving end 32 cannot receive the light. Therefore, as the rotating part 1 continues to rotate, the light guide path will be turned on every time the rotating part rotates a certain angle. At this time, the receiving end will receive the light. According to the number of times the light is received, the rotation angle of the rotating part 1 can be accurately determined. Even if the driving component 2 has problems such as hysteresis and lost step, the rotation angle of the rotating part 1 can still be calculated by the number of times the light is received, thereby improving the positioning accuracy of the rotating part 1, and then improving the focusing accuracy of the lens, and improving the imaging effect of the projector.

[0035] Specifically, the rotating member 1 rotates around its axis, and the intervals of the plurality of light-transmitting holes 12 are evenly distributed, and the plurality of light-transmitting holes 12 are radially distributed about the axis of the rotating member 1. The intervals of the light-transmitting holes 12 are even, so that the intervals of the light passing through the light-transmitting holes 12 each time are the same, that is, the angle of rotation of the rotating member 1 is the same each time the receiving end 32 of the photoelectric sensor 3 detects the light, which is convenient for the subsequent calculation of the total angle of rotation, so that the focusing parameters can be determined by the angle of rotation, and the calculation accuracy is improved. At the same time, the light-transmitting holes 12 are radially distributed about the axis of the rotating member 1 to form an arc, so that each light-transmitting hole 12 can correspond to the transmitting end 31 and the receiving end 32 during the rotation process.

[0036] In one embodiment, the rotating member 1 is a circular rotating cylinder, and the light-transmitting hole 12 is a long hole extending in the radial direction of the rotating member 1. The rotating member 1 is a circular rotating cylinder, which is more stable and symmetrical when rotating, and the light-transmitting hole 12 is set in a long strip shape. Each time the receiving end 32 obtains light, the rotation distance is closer to the spacing between the two light-transmitting holes 12, and the calculation of the rotation angle is more accurate.

[0037] Furthermore, the baffle 11 is an arc-shaped baffle extending along the circumference of the rotating member 1, and the extension length of the baffle 11 is less than the circumference of the rotating member 1. The baffle 11 is arranged in an arc shape, so that the light-transmitting hole 12 can always correspond to the transmitting end 31 and the receiving end 32 during the rotation process, and the distance between the light-transmitting hole 12 and the photoelectric sensor 3 remains unchanged during the rotation process. When the lens is used for focusing, the angle required to rotate is small, so the baffle 11 is a section of an arc, which can meet the focusing requirements, save materials, and reduce the volume.

[0038] Specifically, the plurality of light-transmitting holes 12 have the same shape and the same size, and the line connecting the centroid of each light-transmitting hole 12 and the center of the rotating member 1 is the symmetry axis ( Figure 3 L in the figure), each light-transmitting hole 12 is symmetrically arranged along the corresponding symmetry axis. The multiple light-transmitting holes 12 have the same size and shape, and the light-transmitting holes 12 are symmetrically arranged, so that the spacing between the light-transmitting holes 12 is the same and more accurate, thereby improving the accuracy of judging the rotation angle by the number of light-transmitting holes 12.

[0039] In one embodiment, a rack 13 is provided on the outer side wall of the rotating member 1 along its circumference, and the driving assembly 2 includes a driving member 21 and a gear 22 connected to the output shaft of the driving member 21, the gear 22 is meshed with the rack 13, and the driving member 21 is used to drive the gear 22 to rotate, so as to drive the rotating member 1 to rotate through the rack 13. Specifically, the driving member 21 is a stepping motor, which has high position control accuracy and is suitable for scenes requiring precise positioning such as focusing, which helps to improve the accuracy of focusing.

[0040] In one embodiment, the distance between the centroids of any two adjacent light-transmitting holes 12 is the hole pitch A, and the tooth pitch of the rack 13 is B, wherein b=xA, and x is a positive integer greater than or equal to 1. When the multiples of the hole pitch A and the tooth pitch B are positive integers, it is convenient to calculate the number of teeth of the rack 13 that need to travel by the number of light-transmitting holes 12 that have passed through the receiving end 32, so that the number of revolutions of the rotating member 1 can be accurately controlled, thereby improving the accuracy of focusing.

[0041] In one embodiment, the rack 13 and the baffle 11 are spaced apart in the axial direction of the rotating member 1 and staggered in the circumferential direction of the rotating member 1. Figure 2 As shown, the rack is located at the bottom of the rotating part, and the baffle is at the top of the rotating part. If the rack and the baffle are set correspondingly, it may cause interference between the driving part and the photoelectric sensor. Therefore, the rack 13 and the baffle 11 are set at intervals in the axial direction and staggered in the circumferential direction to avoid mutual interference during rotation and improve the accuracy of detection.

[0042] The present invention also provides a projector, which includes a lens, which includes a housing, a lens body and the above-mentioned rotating structure 100. The lens body is mounted on a rotating member 1. A curved groove extending along its circumferential direction is provided on the outer side wall of the rotating member 1. The two ends of the curved groove are spaced apart along the axial direction of the rotating member 1 and driven to rotate by the rotating structure 100. A curved groove extending obliquely downward along the extension direction of the outer side wall is provided on the outer side wall of the rotating member 1. An abutment member for abutting and slidingly contacting with the groove wall of the curved groove is provided on the housing. The driving assembly 2 drives the rotating member 1 to rotate so as to drive the lens body to rotate, and drives the lens body to move along the axial direction of the rotating member 1 through the cooperation of the curved groove and the abutment member. The specific structure of the rotating structure 100 refers to the above-mentioned embodiment. Since the present projector adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0043] In one embodiment, a plurality of engaging holes 14 are provided on the side wall of the rotating member 1 and are arranged at intervals along the circumference thereof. The engaging holes 14 are arranged at intervals from the blocking piece 11, and the engaging holes 14 are used to engage with the lens body. The engaging holes 14 increase the stability of the connection between the rotating member 1 and the lens body, so that the rotation angles of the rotating member 1 and the lens body are completely consistent, and there will be no problems such as misalignment or sliding that cause errors in the rotation of the lens body, thereby improving the accuracy of focus positioning.

[0044] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A rotating structure, characterized in that: include: A rotating member, wherein a baffle extending along its circumferential direction is arranged on the side wall of the rotating member, and the baffle is provided with a plurality of light-transmitting holes spaced apart along its extending direction; A photoelectric sensor, the photoelectric sensor comprising a transmitting end and a receiving end, the transmitting end and the receiving end are arranged at intervals to form a gap, the baffle is arranged in the gap, the transmitting end is used to emit light, and the receiving end is used to receive the light propagating along a light guide path, and the light guide path passes through the gap; A driving assembly is used to drive the rotating member to rotate so that the multiple light-transmitting holes of the baffle plate are connected to the light-guiding path in sequence, and the area between any two adjacent light-guiding holes on the baffle plate is used to cut off the light-guiding path.

2. The rotating structure according to claim 1, characterized in that: The rotating member rotates around its axis, the multiple light-transmitting holes are evenly distributed at intervals, and the multiple light-transmitting holes are radially distributed about the axis of the rotating member.

3. The rotating structure according to claim 2, characterized in that: The rotating member is a circular rotating cylinder, and the light-transmitting hole extends along the radial direction of the rotating member to form a long strip-shaped hole.

4. The rotating structure according to claim 3, characterized in that: The blocking piece is an arc-shaped blocking piece extending along the circumference of the rotating member, and the extension length of the blocking piece is smaller than the circumference of the rotating member.

5. The rotating structure according to claim 3, characterized in that: The plurality of light-transmitting holes have the same shape and size, and a line connecting the centroid of each light-transmitting hole and the center of the rotating member is a symmetry axis, and each light-transmitting hole is symmetrically arranged along the corresponding symmetry axis.

6. The rotating structure according to any one of claims 1 to 5, characterized in that: A rack is arranged on the outer side wall of the rotating member along its circumference. The driving assembly includes a driving member and a gear connected to the output shaft of the driving member. The gear is meshed with the rack. The driving member is used to drive the gear to rotate, so as to drive the rotating member to rotate through the rack.

7. The rotating structure according to claim 6, characterized in that: The distance between the centroids of any two adjacent light-transmitting holes is the hole pitch A, and the tooth pitch of the rack is B, wherein b=xA, and x is a positive integer greater than or equal to 1.

8. The rotating structure according to claim 6, characterized in that: The rack and the blocking piece are spaced apart in the axial direction of the rotating member and staggeredly distributed in the circumferential direction of the rotating member.

9. A projector, characterized in that: The projector includes a lens, which includes a shell, a lens body and a rotating structure as described in any one of claims 1 to 8, the lens body is installed on the rotating part, a curved groove extending along its circumference is opened on the side wall of the rotating part, and the two ends of the curved groove are arranged at intervals along the axial direction of the rotating part, and an abutment member for slidingly contacting with the curve is provided on the shell, the driving assembly drives the rotating part to rotate to drive the lens body to rotate, and the lens body is driven to move along the axial direction of the rotating part through the cooperation of the curved groove and the abutment member.

10. The projector according to claim 9, characterized in that A plurality of clamping holes are arranged at intervals along the circumference of the rotating member on the side wall, the clamping holes are arranged at intervals from the blocking piece, and the clamping holes are used for clamping and matching with the lens body.

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