CN214375768U - Outer barrel for automatic focusing lens, automatic focusing lens and projector - Google Patents

Abstract

The utility model relates to an urceolus for automatic focusing camera lens, automatic focusing camera lens and projecting apparatus, be provided with spacing spout and spacing hole on the lateral wall of urceolus, the bottom of spacing spout is provided with the guiding hole, the axial extension of urceolus is followed in spacing hole, spacing spout be used for with the automatic focusing camera lens the focusing rack on spacing smooth protruding cooperation, the axis spiral of duplex winding urceolus extends, the guiding hole is unanimous with the extending direction of spacing spout, wherein, the central plane of guiding hole and the skew setting of the central plane of spacing spout. The outer cylinder of the utility model can be completely fixed when being applied to the automatic focusing lens, therefore, the driving motor can be arranged on the outer cylinder, the weight of the moving part is reduced, the eccentric acting force generated on the inner cylinder is avoided, and the movement precision of the inner cylinder is further improved; and through increasing the slider, can increase the active area to inner tube drive, and then make the motion of inner tube more steady, promote the picture quality of projecting apparatus.

Description

Outer barrel for automatic focusing lens, automatic focusing lens and projector

Technical Field

The utility model relates to a projection technology field especially relates to an urceolus, automatic focusing camera lens and projecting apparatus for automatic focusing camera lens.

Background

The projector is a device for projecting images or videos onto a curtain or a wall, and is widely applied to homes, offices, schools, entertainment places and the like, and when the projector is used, the focal length of the projector is often required to be adjusted according to factors such as different projection distances and curtain sizes so as to present clear pictures. The existing projector carries out focusing through telescopic sliding of the inner cylinder relative to the outer cylinder, the outer cylinder is provided with a guide hole inclined relative to the axis of the outer cylinder and a rack extending along the circumferential direction of the outer cylinder, the rack is meshed with a driving gear to drive the outer cylinder to rotate, the outer wall of the inner cylinder is connected with a deflector rod and a driving motor, the deflector rod penetrates through the guide hole, and the driving motor is connected with the driving gear. Therefore, when the outer barrel rotates, the deflector rod slides relative to the guide hole, and the inner barrel is driven to move along the axial direction of the outer barrel.

However, in this structure, the inner cylinder moves axially relative to the outer cylinder, and the driving motor and other components are mounted on the inner cylinder, which inevitably increases the weight of the whole inner cylinder, and the driving motor is eccentrically arranged relative to the whole inner cylinder, thereby affecting the movement accuracy of the inner cylinder; the inner cylinder is driven to move only through the connection part of the deflector rod and the inner cylinder, so that a larger acting force is needed, and the inner cylinder is driven to move only through the deflector rod at the position, so that the axial movement precision of the whole inner cylinder relative to the outer cylinder is reduced, and even the off-axis of some optical lenses arranged on the inner cylinder is caused, and the picture quality of the whole projector is influenced.

SUMMERY OF THE UTILITY MODEL

Based on the above current situation, a primary object of the present invention is to provide an outer barrel for an automatic focus lens, an automatic focus lens and a projector.

In order to achieve the above object, the utility model adopts the following technical scheme:

a first aspect of the present invention provides an outer barrel for an automatic focus lens, the automatic focus lens including an inner barrel that slides axially along the outer barrel and a driving assembly that drives the inner barrel to slide; the outer wall of the inner barrel is connected with a limiting piece, the inner barrel is provided with an annular groove surrounding the circumference of the inner barrel, the driving component comprises a sliding block sliding along the annular groove, a driving part connected to the sliding block and in sliding fit with a guide hole arranged on the side wall of the outer barrel, and a focusing rack, and two ends of the driving part are respectively connected with the sliding block and the focusing rack;

the side wall of the outer barrel is provided with a limiting hole and a limiting sliding groove which are used for being in sliding fit with the limiting piece, and the limiting hole extends along the axial direction of the outer barrel and penetrates through the inner hole of the outer barrel; the limiting sliding groove is used for being matched with the limiting sliding protrusion on the focusing rack, the limiting sliding groove is formed by sinking the outer wall of the outer barrel and spirally extends around the axis of the outer barrel, the guide hole is formed in the bottom of the limiting sliding groove and is consistent with the extending direction of the limiting sliding groove, the central plane of the guide hole is arranged in a mode of deviating with the central plane of the limiting sliding groove, and the central plane is parallel to the extending direction.

Preferably, the guiding hole comprises a first hole wall and a second hole wall which are opposite to each other, the limiting sliding groove comprises a first groove wall and a second groove wall which are opposite to each other, and the first hole wall and the first groove wall are located on the same side and are arranged in a coplanar manner.

Preferably, the guide hole is located in the middle of the limiting sliding groove in the extending direction of the limiting sliding groove.

Preferably, the outer barrel comprises a focusing barrel with a stepped structure, the limiting sliding groove is formed in a small section of the focusing barrel, and the limiting hole is formed in a large section of the focusing barrel.

Preferably, the large section is further provided with a motor mounting area, the motor mounting area is provided with motor positioning holes and motor locking holes which are arranged in a triangular shape for mounting a driving motor of the automatic focusing lens, two of the motor locking holes are arranged along the circumferential direction of the outer barrel, and the motor positioning hole is arranged between the two motor locking holes; in the circumferential direction of the outer barrel, the limiting hole is located on the outer side of the motor mounting area.

Preferably, the large section is further provided with an optical coupler mounting area, the optical coupler mounting area is provided with an optical coupler positioning hole and optical coupler locking holes for mounting an optical coupler assembly of the automatic focusing lens, at least two optical coupler locking holes are staggered in the circumferential direction and the axial direction of the outer barrel, and the optical coupler positioning hole is arranged between the two optical coupler locking holes; in the circumferential direction of the outer barrel, the limiting hole is located on the outer side of the optical coupler mounting area.

Preferably, the outer cylinder further comprises a connecting flange connected to the end of the large section, the connecting flange is provided with an optical machine mounting hole and a positioning notch, the optical machine mounting hole is used for being connected with an optical machine shell of the projector, and the positioning notch penetrates through the connecting flange along the axial direction of the outer cylinder.

Preferably, the outer cylinder further comprises an extending section connected to the connecting flange and deviating from the large section, and the extending section is used for extending into the light shell of the projector.

Preferably, the outer cylinder further comprises an annular flange connected to the end of the small section, an installation notch and a cover body locking hole are formed in the outer side wall of the annular flange, the installation notch penetrates through the annular flange along the axial direction of the outer cylinder, and the cover body locking hole and the installation notch are alternately arranged at intervals in the circumferential direction of the annular flange.

Preferably, along the circumference of annular flange, the installation breach with cover body locking hole equipartition respectively has a plurality ofly, adjacent two the installation breach with be located between the two in the cover body locking hole, cover body locking hole is apart from one of them the distance of installation breach is than another the distance of installation breach is big.

A second aspect of the present invention provides an automatic focusing lens, including any one of the above-mentioned outer barrel, an inner barrel inserted into the outer barrel along an axial direction of the outer barrel, a driving component for driving the inner barrel to slide, and a limiting member, wherein one end of the limiting member is connected to the inner barrel, and the other end is inserted into the limiting hole in a sliding manner; the inner cylinder is provided with an annular groove which surrounds along the circumferential direction of the inner cylinder;

drive assembly includes the edge gliding slider of annular groove, connect in the slider and with guiding hole sliding fit's driving medium and focusing rack, focusing rack is located the outside of urceolus, focusing rack's lateral surface is provided with the meshing tooth, be provided with the connecting hole on the medial surface and set up in the spacing protruding of sliding of connecting hole both sides, wherein, two spacing protruding central plane coplane of sliding, and with the skew setting of central line of connecting hole, spacing protruding with spacing spout sliding fit, the one end of driving medium with the slider is connected, the other end with connecting hole cartridge cooperation

A third aspect of the present invention provides a projector, comprising an optical housing and an automatic focusing lens as described above, wherein the automatic focusing lens passes through the outer cylinder installed in the optical housing.

The utility model discloses an outer cylinder is provided with guiding hole and spacing hole simultaneously on the outer cylinder, when it is applied to the automatic focusing camera lens, the outer cylinder can be fixed completely, spacing hole and locating part sliding fit, make the inner cylinder only can be along the axial slip of outer cylinder, the guiding hole passes through driving medium drive slider and makes spiral motion for the outer cylinder, and it receives the restraint of annular groove on the inner cylinder again, can only make circumferential motion for the inner cylinder, and then promote the inner cylinder to make axial motion, that is to say, through increasing transition motion spare slider, can make the outer cylinder static, only inner cylinder motion, therefore, can install driving motor on the outer cylinder, alleviate the weight of motion part, avoid producing eccentric effort to the inner cylinder, and then improve the motion precision of inner cylinder; and through increasing the slider, can increase the active area to inner tube drive, and then make the motion of inner tube more steady, promote the picture quality of projecting apparatus.

Other advantages of the present invention will be described in the detailed description, and those skilled in the art can understand the technical advantages brought by the technical features and technical solutions through the descriptions of the technical features and the technical solutions.

Drawings

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In the figure:

fig. 1 and 2 are schematic structural views of an outer barrel according to the present invention;

fig. 3 is a schematic structural diagram of a preferred embodiment of an automatic focusing lens provided by the present invention;

fig. 4 is an exploded view of a preferred embodiment of an automatic focus lens provided by the present invention;

fig. 5 is a schematic structural diagram of an embodiment of an inner barrel of an automatic focusing lens provided by the present invention;

fig. 6 is a schematic structural diagram of a preferred embodiment of a focusing rack and an automatic focusing lens provided by the present invention;

fig. 7 is a partial exploded view of a preferred embodiment of a projector provided by the present invention.

In the figure:

100. an automatic focus lens; 10. an outer cylinder; 11. a limiting hole; 12. a limiting chute; 13. a guide hole; 14. a focusing barrel; 141. a small segment; 142. a large section; 1421. an optical coupler positioning hole; 1422. an optocoupler locking hole; 1423. a motor locking hole; 1424. a motor positioning hole; 15. a connecting flange; 151. a mounting hole of the optical machine; 152. positioning the notch; 16. a protruding section; 17. an annular flange; 171. installing a notch; 172. a cover body locking hole; 20. an inner barrel; 21. an annular groove; 22. limiting locking holes; 30. a limiting member; 31. a slider; 32. a fastener; 40. a drive assembly; 41. a transmission member; 42. a slider; 43. a drive motor; 44. a drive gear; 45. a focusing rack; 451. meshing teeth; 452. limiting sliding protrusions; 453. connecting holes; 455. a light shielding structure; 46. a motor base; 461. a motor mounting hole; 50. an optocoupler assembly; 51. a mounting seat; 511. an optocoupler positioning column; 512. an optocoupler mounting hole; 52. an optocoupler device; 53. a circuit board; 54. a connection terminal; 60. an optical lens group;

300. an optical chassis; 310. locking holes of the optical machine; 320. positioning the projection;

400. a seal member;

510. a first locking member; 520. a second locking member; 530. a third locking member; 540. fourth lock

600. A lens cover; 620. a limiting boss; 630. a cover body mounting hole.

Detailed Description

The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth in order to avoid obscuring the spirit of the present invention, well-known methods, procedures, flows, and components have not been described in detail.

Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".

In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

It should be noted that the step numbers (letter or number numbers) used in the present invention are used to refer to some specific method steps only for the purpose of convenience and brevity of description, and the order of the method steps is not limited by letters or numbers in any way. It will be clear to a person skilled in the art that the order of the steps of the method in question, as determined by the technology itself, should not be unduly limited by the presence of step numbers.

The utility model provides a projector, as shown in fig. 1-7, including light casing (not shown in the figure) and automatic focusing lens 100, automatic focusing lens includes urceolus 10 and along the axial slip inner tube 20 of urceolus 10, drive the gliding drive assembly 40 of inner tube 20, understandably, automatic focusing lens still includes optical lens group 60, and optical lens group 60 installs in inner tube 20. The auto focus lens 100 is mounted to the optical housing through the outer cylinder 10.

A guide hole 13 is formed in the side wall of the outer cylinder 10, the driving assembly 40 includes a driving member 41, the driving member 41 is slidably inserted into the guide hole 13, referring to fig. 1-7, the side wall of the outer cylinder 10 further includes a limiting hole 11 and a limiting sliding groove 12, the limiting hole 11 extends along an axial direction parallel to the outer cylinder 10, that is, the limiting hole 11 is a strip-shaped hole extending along the axial direction, or is called a kidney-shaped hole, and penetrates through to an inner hole of the outer cylinder 10; the limiting sliding groove 12 extends spirally around the axis of the outer cylinder 10, that is, the limiting sliding groove 12 is a spiral groove formed on the outer wall of the outer cylinder 10 and can be formed by inward recessing of the outer wall of the outer cylinder 10, the guide hole 13 is formed at the bottom of the limiting sliding groove 12, and the extending direction of the guide hole 13 is consistent with the extending direction of the limiting sliding groove 12, that is, the guide hole 13 is also a strip-shaped hole or a kidney-shaped hole, but the extending direction is spirally extended.

The outer wall of the inner cylinder 20 is provided with an annular groove 21 circumferentially surrounding it. The auto-focus lens 100 further includes a limiting member 30 connected to the outer wall of the inner cylinder 20 and slidably engaged with the limiting hole 11, for example, one end of the limiting member 30 is connected to the inner cylinder 20, and the other end thereof extends into the limiting hole 11 and can slide in the limiting hole 11 along the axial direction of the outer cylinder 10. The inner cylinder 20 is provided with an annular groove 21 circumferentially surrounding it. The driving assembly 40 further comprises a slider 42 and a focusing rack 45 sliding along the annular groove 21, the driving member 41 is connected to the slider 42, the focusing rack 45 is located outside the outer barrel 10, a connecting hole 453 and limiting sliding protrusions 452 arranged on two sides of the connecting hole are arranged on the focusing rack 45, the limiting sliding protrusions 452 are in sliding fit with the limiting sliding grooves 12, that is, the focusing rack 45 extends along the extending direction of the limiting sliding grooves 12, the outer side surface of the focusing rack 45 is provided with engaging teeth 451, and the two ends of the inner side surface in the extending direction are respectively provided with the limiting sliding protrusions 452 in a protruding manner; one end of the transmission member 41 facing away from the slider 42 is inserted into the connection hole 453.

In the outer cylinder 10 provided in the above embodiment, on one hand, the outer cylinder 10 is provided with the guide hole 13 and the limiting hole 12 at the same time, when the outer cylinder 10 is applied to the automatic focusing lens 100, the outer cylinder 10 can be completely fixed, the limiting hole 12 is in sliding fit with the limiting piece 30, so that the inner cylinder 20 can only slide along the axial direction of the outer cylinder 10, the guide hole 13 drives the slider 42 to make a spiral motion relative to the outer cylinder 10 through the transmission piece 41, and the slider is constrained by the annular groove 21 on the inner cylinder 20, and can only make a circumferential motion relative to the inner cylinder 20, so as to further push the inner cylinder 20 to make an axial motion, that is, by adding the transitional motion piece slider 42, the outer cylinder 10 can be made to be stationary, and only the inner cylinder 20 can be moved, so that the driving motor 43 can be installed on the outer cylinder 10, the weight of a moving part is reduced, an eccentric acting force on the inner cylinder 20 is avoided, and the movement precision of the inner cylinder 20 is improved; and through increasing slider 42, can increase the area of action of driving inner tube 20, and then make the motion of inner tube 20 more steady, promote the picture quality of projecting apparatus.

On the other hand, considering that the focusing rack 45 is disposed outside the outer cylinder 10 and is only constrained at the connection with the transmission member 41, and the engagement position of the focusing rack 45 with the driving gear 42 and the connection position with the transmission member 41 are not always consistent, therefore, during the sliding process of the focusing rack 45, both ends of the focusing rack may shake, even have a large deviation relative to the predetermined spiral track, resulting in an unstable focusing process, a reduction in transmission precision, and an impact on the focusing effect, especially when the required focusing stroke is large, i.e. the sliding stroke of the transmission member 41 is large, the corresponding focusing rack 45 is also relatively long, and at this time, the shaking at both ends of the focusing rack 45 is more obvious, for this reason, the present invention further provides the limiting chute 12 on the outer cylinder 10, and the limiting sliding protrusion 452 is disposed on the focusing rack 45, and the two are in sliding fit, so, in the sliding process of the focusing rack 45, the limiting sliding protrusion 452 also performs spiral sliding together, so that the two ends of the focusing rack 45 can be limited, the sliding of the focusing rack 45 is more stable, especially when the focusing range is larger, the effect is more obvious, the focusing precision is better improved, and the picture quality of the projector is ensured. And the transmission piece 41 and the focusing rack 45 are connected together, and the two cannot slide relatively in the whole focusing process, namely the focusing rack 45 and the transmission piece 41 perform spiral motion together, so that the accumulated error in the focusing process can be reduced, and the focusing precision can be better improved.

Considering that the focus rack 45 is spirally extended, it needs to be consistent with the extending direction of the guide hole 13 and the limiting sliding groove 12, but in actual assembly, the extending direction of the focus rack needs to be carefully observed to be distinguished, even if so, the installation error is possible, especially, the focus rack 45 is more difficult to confirm when being short, in order to avoid the above problem, as shown in fig. 1, the center plane of the guide hole 13 and the center plane of the limiting sliding groove 12 are arranged in a deviating way with the center plane of the limiting sliding groove 12. Further, the center planes of the two limiting sliding protrusions 452 are coplanar and are arranged to be offset from the center line of the connection hole 453, and the offset direction and the offset dimension of the center plane of the guide hole 13 are the same as the offset direction and the offset dimension of the center line of the connection hole 453, for convenience of description, the center plane of the guide hole 13 may be referred to as a first center plane, the center plane of the limiting sliding groove 12 may be referred to as a second center plane, and the center planes of the two limiting sliding protrusions 452 may be referred to as a third center plane, and if the first center plane is offset toward the light emitting side of the lens (i.e., the side away from the optical housing) relative to the second center plane, the connection hole 453 is also offset toward the light emitting side of the lens relative to the third center plane, and the offset dimensions of the two are equal; if the first central plane deviates from the second central plane toward the light incident side of the lens (i.e., the side connected to the chassis), the center line of the connecting hole 453 also deviates from the third central plane toward the light incident side of the lens, and the deviation sizes are equal. After the arrangement, the focusing rack 45 can be installed only in one direction (light incident side or light emergent side) relative to the outer cylinder 10, so that the fool-proof effect is achieved, and the installation efficiency of the lens is improved. Wherein, the central plane is parallel to the extending direction of the limiting chute 12, and the central plane is a spiral curved surface. The width refers to a dimension in a direction perpendicular to the extending direction of the position-restricting chute 12. In a preferred embodiment, the guide hole 13 includes a first hole wall and a second hole wall opposite in width, the limiting chute 12 includes a first groove wall and a second groove wall opposite in width, the first hole wall and the first groove wall are located on the same side and are arranged in a coplanar manner, as shown in fig. 1, the first hole wall and the first groove wall are both located on the light incident side of the lens 100 and are arranged in a coplanar manner, the second hole wall and the second groove wall are located on the light emergent side of the lens 100, and the second hole wall is closer to the light incident side than the second groove wall; of course, the second hole wall and the second groove wall may be disposed in a same plane and both located on the light exit side of the lens. By adopting the mode, the fool-proof function can be better played, and the processing and the assembly are more convenient. Wherein the width direction refers to a direction perpendicular to the extending direction.

Referring to fig. 1-2, the guide hole 13 is located substantially in the middle of the position-limiting sliding groove 12 along the extending direction thereof, that is, the position-limiting sliding groove 12 has a stroke on both sides of the guide hole 13 along the extending direction thereof, accordingly, two position-limiting sliding protrusions 453 are respectively disposed on both ends of the focus rack 45, that is, the connection hole 453 is disposed in the middle of the focus rack 45 in the extending direction thereof, two position-limiting sliding protrusions 452 are disposed on the ends of the focus rack 45 in the extending direction thereof, and during the sliding of the focus rack 45, the two position-limiting sliding protrusions 452 respectively slide in the position-limiting sliding grooves 12 on both end sides of the guide hole 13. Therefore, the stability of the movement of the focus rack 45 can be further improved, and the precision of focusing can be further improved.

With continued reference to fig. 1 and 2, the outer barrel 10 includes a focusing barrel 14 in a stepped structure, the limiting sliding groove 12 is disposed on a small section 141 of the focusing barrel 14, and the limiting hole 11 is disposed on a large section 142 of the focusing barrel 14, so that the stepped structure can reduce the radial size of the whole lens, and is beneficial to the development of the projector towards miniaturization; on the other hand, if spacing spout 12 and spacing hole 11 all set up in segment 141, then locating part 30 and slider 42 probably take place to interfere, in order to avoid the two to take place to interfere, slider 42's slip stroke can only set up less, can't be applied to the camera lens of great focusing stroke like this, and the utility model discloses in, make spacing spout 12 and spacing hole 11 dislocation set in the axial of urceolus 10, can solve above-mentioned problem, improve the range of application of camera lens 100, and can make the spatial arrangement of whole camera lens 100 more compact. Further, other components may also be mounted on the major segment 142, such as the motor mount 46 and the optocoupler assembly 50 described below. Specifically, the large section 142 may be located on a side of the focusing barrel 14 close to the light incident side or the light emergent side of the lens, preferably, the large section 142 is located on a side of the focusing barrel 14 close to the light incident side, and especially when the connecting flange 15 (described in detail below) is disposed at an end of the large section 142, other components may be directly mounted on the large section 142, so as to reduce the weight of the entire lens 100 on the light emergent side, and better ensure the projection quality of the entire projector. Of course, the limiting hole 11 and the limiting sliding groove 12 may also be directly disposed on the same cylinder, that is, the outer contour dimensions of the outer wall of the focusing cylinder 14 are the same, for example, when the focusing cylinder is a cylindrical cylinder, the diameters of the positions are the same.

The outer barrel 10 is further provided with a connecting flange 15, the connecting flange 15 is disposed in a protruding manner in a radial direction of the outer barrel 10, in an embodiment where the outer barrel 10 includes the focusing barrel 14, the connecting flange 15 may be connected to an end of the small segment 141, or may be connected to an end of the large segment 142, preferably, connected to an end of the large segment 142, and the effects thereof are as described above, and will not be described herein again. The connecting flange 10 may be directly disposed at the end of the whole outer barrel 10, in a preferred embodiment, the connecting flange 15 is closer to the inner end of the outer barrel 10 (i.e. the end close to the light-out side of the lens) than the outer end of the outer barrel 10 (i.e. the end close to the light-in side of the lens) and the inner end extends out of the connecting flange 15, that is, the outer barrel 10 further includes an extending section 16, and the extending section 16 is located at the end of the connecting flange 15 close to the light-in side of the outer barrel 10 and is used for extending into the optical housing 300 of the projector. With continued reference to fig. 1-2, the connecting flange 15 is provided with an optical engine mounting hole 151 and a positioning notch 152 for connecting with an optical engine housing of the projector, the optical engine mounting hole 151 and the positioning notch 152 penetrate through the connecting flange 15 along the axial direction of the outer cylinder 10, and the positioning notch 152 is disposed at the edge of the connecting flange 15; correspondingly, the optical chassis is provided with an optical machine locking hole 310 matched with the optical machine mounting hole 151 and a positioning protrusion 320 matched with the positioning notch 152, so that when the automatic focusing lens 100 is mounted on the optical chassis 300, the connecting flange 15 is attached to the end face of the optical chassis 300, the positioning protrusion 320 is matched with the positioning notch 152 to position the automatic focusing lens 100, and then the first locking member 510 penetrates through the optical machine mounting hole 151 to be locked with the optical machine locking hole 310, so as to lock the automatic focusing lens 100 and the optical chassis 300. By adopting the mode, the alignment precision of the lens, particularly the optical lens group 60 of the lens and the optical system in the optical machine shell 300 can be ensured, and the picture quality of the projector is improved; in addition, by extending the inner end of the outer barrel 10 out of the connecting flange 15, external dust, water vapor and the like must enter the optical chassis 300 along the gap between the connecting flange 15 and the optical chassis 300 and the gap between the extending section 16 and the optical chassis 300, which obviously increases the path length of the communication between the outside and the optical chassis 300, and can better protect the optical system and the like in the optical chassis 300 from the dust, water vapor and the like. Further, in order to prevent impurities such as dust from entering into the optical chassis 300, a sealing member 400 is further disposed between the connecting flange 15 and the optical chassis 300, as shown in fig. 7. Specifically, the connecting flange 15 may have a square structure, and has light machine mounting holes 151 respectively formed at four corners thereof, and positioning notches 152 respectively formed at two opposite edges thereof. The positioning notch 152 may be a semi-cylindrical hole, and correspondingly, the positioning protrusion 320 is a semi-cylindrical body, and the semi-cylindrical hole is matched with the semi-cylindrical body.

Other components, such as a lens cover 600 hereinafter, may also be connected to the auto-focus lens 100 at its light-emitting side. In some embodiments, the inner tube 20 may extend out of the outer end of the outer tube 10, in order to better protect the inner tube 20 and the optical lens assembly 60, and facilitate connection of other components, the outer end (i.e. the end close to the light emitting side of the lens) of the outer tube 10 is provided with an annular flange 17, in embodiments where the outer tube 10 includes the focusing tube 14, the annular flange 17 is disposed at the end of the segment 141, an outer side wall of the annular flange 17 is recessed to form a mounting notch 171, and an outer side wall of the annular flange is provided with a cover locking hole 172, the mounting notch 171 penetrates through the annular flange 17 along the axial direction of the outer tube 10, the cover locking hole 172 and the mounting notch 171 are alternately disposed at intervals in the circumferential direction of the annular flange 17, so as to mount the lens cover 600 of the projector through the mounting notch 171, and lock the lens cover locking hole 172.

Specifically, the lens further includes a lens cover 600, referring to fig. 7, the lens cover 600 is a cylindrical structure, and is sleeved outside the annular flange 17, one end of the lens cover 600 close to the annular flange 17 is provided with a limiting boss 620, the limiting boss 620 extends towards the inside of the lens cover 600, and in the circumferential direction of the annular flange 17, the size of the limiting boss 620 is smaller than that of the installation notch 171; the side wall of the lens cover 600 is provided with a cover mounting hole 630 at a position close to the limit boss 620, the cover mounting hole 630 and the limit boss 620 are staggered in the axial direction of the automatic focus adjusting lens 100, so that after the limit boss 620 passes through the mounting notch 171, the lens cover 600 is rotated around the axis of the lens, the limit boss 620 and the mounting notch 171 are staggered in the circumferential direction of the annular flange 17, at this time, the limit boss 620 is limited at the inner end (i.e., the end close to the light incident side of the lens) of the annular flange 17, and then the second locking member 520 passes through the cover mounting hole 630 and is locked with the cover locking hole 172, so as to fix the lens cover 600 with the outer barrel 10. To prevent lens hood 600 from blocking light, lens hood 600 further includes a conical cylinder section connected to an end of cylindrical section 610, that is, the conical cylinder section is connected to an end of cylindrical section 610 far from limiting boss 620.

Further, along the circumference of the annular flange 17, the mounting notches 171 and the cover body locking holes 172 are uniformly distributed, two adjacent mounting notches 171 and the cover body locking holes 172 located therebetween are formed, the distance from the cover body locking hole 172 to one of the mounting notches 171 is greater than that from the other mounting notch 171, that is, the cover body locking hole 172 is not located between the two adjacent mounting notches 171, and thus, after the limiting boss 620 of the lens cover 600 passes through the mounting notch 171, the lens cover 600 does not need to rotate by a too large angle to enable the cover body mounting hole 630 to be opposite to the cover body locking hole 172.

One end of the transmission member 41 is connected with the sliding block 42, and the other end is connected between two limiting sliding protrusions 452 on the focusing rack 45.

Specifically, the limiting member 30 and the inner cylinder 20 can be connected by a screw connection, a riveting, a clamping, etc., and the limiting member 30 and the inner cylinder 20 are connected by a screw connection for the convenience of assembly and processing. In a preferred embodiment of the present invention, the position-limiting member 30 includes a sliding member 31 and a fastening member 32, as shown in fig. 4, the sliding member 31 can be a cylindrical structure, the outer wall thereof is in sliding fit with the position-limiting hole 11, the center thereof is provided with a position-limiting mounting hole, the fastening member 32 can be a screw, a bolt, and other parts, and the fastening member 32 passes through the position-limiting mounting hole and is in threaded connection with the inner tube 20.

Further, in order to make the inner cylinder 20 slide along the axial direction of the outer cylinder 10 better, the limiting hole 11, the limiting member 30 and the limiting locking hole 22 may be provided with a plurality of sets, and may be arranged along the circumferential direction of the outer cylinder 20, for example, two sets are arranged uniformly along the circumferential direction of the outer cylinder 20.

The slider 42 internal surface is the arcwall face with annular groove 21 complex to increase the area of contact of slider 42 and annular groove 21, slider 42 can receive the effort that drive gear 44 passes through focusing rack 45, transmission medium 41 transmission when sliding, through setting up the arcwall face and inner tube 20 cooperation, can improve focusing rack 45 and the gliding stability of slider 42. Further, the slider 42 is an arc-shaped block, as shown in fig. 4, that is, it extends along the circumferential direction of the annular groove 21, such as an arc-shaped block with a central angle of 45 °, 90 °, 100 °, 150 °, 180 °, and preferably, the central angle of the slider 42 is close to or equal to 180 °, such as 170 °, 175 °, 180 °, and so on, so as to better increase the stability of the sliding of the focus rack 45 and the slider 42. In order to facilitate processing and assembly, the outer arc surfaces of the outer wall of the arc-shaped block at the two ends can be set into a plane structure.

Specifically, transmission member 41 is the cylinder piece that is the stair structure, including the first linkage segment, direction section and the second linkage segment that connect gradually, and first linkage segment is connected with slider 42, and direction section and guiding hole sliding fit, second linkage segment are connected with focusing rack 45. The transmission member 41 can be connected with the slider 42 and the focusing rack 45 by means of screw connection, riveting, clamping and the like, so that the first connecting section is in screw connection with the slider 42, and the second connecting section is in plug-in connection with the connecting hole 453 of the focusing rack 45 for convenience in assembly and processing.

Referring to fig. 6, in order to facilitate processing and improve the reliability of the sliding of the focus rack 45, two limiting sliding protrusions 452 cooperating with the limiting sliding grooves 12 are disposed at two ends of the focus rack 45, and center planes of the two limiting sliding protrusions 452 are disposed in a coplanar manner, wherein the center planes are parallel to the extending direction of the limiting sliding grooves 12, and since the limiting sliding grooves 12 extend in a spiral manner, a plane where the two coplanar center planes are located is a curved surface extending in a spiral manner. The length of focusing rack 45 (i.e. the size along its extending direction) can set up as required specifically, in order to obtain better focusing effect to and the application of the great distance scope between adaptation curtain and the projecting apparatus, focusing stroke needs to set up bigger, and the length of focusing rack 45 is also bigger, the utility model discloses an embodiment, focusing rack 45 is close or encircles half of urceolus 10 circumference basically, and the central angle of the projection of axial focusing rack 45 along urceolus 10 is close or equals 180 degrees promptly, for example for 170 degrees, 175 degrees, 180 degrees etc. in this embodiment, the effect that the both ends of focusing rack 45 set up spacing smooth protruding 452 is especially obvious. Of course, the central angle of the projection of the focus rack 45 may be 90 degrees, 150 degrees, 190 degrees, or the like.

The focusing rack 45 may be an arc-shaped strip structure, that is, the focusing rack 45 may be a strip structure extending along the circumferential direction of the outer barrel 10, in a preferred embodiment, the focusing rack 45 extends along the extending direction of the limiting chute 12, that is, the focusing rack 45 is a spiral strip structure, as shown in fig. 6, so that the width of the focusing rack 45 may be set to be narrower to better adapt to a lens with a smaller axial dimension, that is, a spirally extending focusing rack 45 is adopted, and during the movement of the focusing rack 45, the meshing position of the driving gear 44 and the focusing rack 45 is substantially unchanged in the width direction of the focusing rack 45, and therefore, the axial dimension of the lens of the whole projector can be reduced; and the adoption of the focusing rack 45 extending spirally can well identify the spiral direction between the focusing rack and the guide hole 13 in the installation process, thereby facilitating the installation.

An end of the focusing rack 45 is provided with a light shielding structure 455 along the extending direction of the limiting sliding groove 12, so as to be used for cooperating with the optical coupler assembly 50 in the focusing mechanism 100, that is, the automatic focusing lens 100 further comprises the optical coupler assembly 50, the optical coupler assembly 50 comprises a mounting seat 51 fixedly mounted on the outer barrel 10 and an optical coupler 52 mounted on the mounting seat 51, when the outer barrel 10 comprises the focusing barrel 14, the mounting seat 51 is fixedly mounted on the large section of the focusing barrel 14, the optical coupler 52 is arranged on the radial outer side of the small section of the focusing barrel 14, and is located in the stroke of the light shielding structure 455, so that the light shielding structure 453 can slide into or slide out between the transmitting end and the receiving end of the optical coupler 52 through the sliding of the focusing rack 45. The fixed mode of mount pad 51 and urceolus 10 can be for modes such as screw connection, joint, consider that the assembly precision requirement of opto-coupler 52 is higher, the utility model discloses an embodiment, big section 142 still is provided with the opto-coupler installing zone, refer to fig. 2, the opto-coupler installing zone is equipped with opto-coupler locating hole 1421 and opto-coupler locking hole 1422 for installation opto-coupler subassembly 50, at least two opto-coupler locking holes 1421 all misplace in the circumference and the axial of urceolus 10, like the equal dislocation set of two pipe ditch locking holes 1421 in the axial of urceolus 10 and circumference shown in the figure, opto-coupler locating hole 1421 sets up between these two opto-coupler locking holes 1422; in the circumferential direction of the outer cylinder 10, the limit hole 11 is located outside the photocoupler mounting area. Correspondingly, the inner surface of the mounting seat 51 facing the outer barrel 10 is provided with an optical coupler positioning column 511 matched with the optical coupler positioning hole 1421, the mounting seat 51 is further provided with an optical coupler mounting hole 512 matched with the optical coupler locking hole 1422, the mounting seat 51 is mounted on the outer barrel 10 through a third locking piece 530 penetrating through the optical coupler mounting hole 512, so as to detect the moving position of the focusing rack 45, so as to avoid the problem that the focusing is excessive to damage the whole automatic focusing lens 100, and prevent the limiting sliding protrusion 452 on the focusing rack 45 from colliding with the end part of the limiting sliding groove 12, or prevent the end part of the transmission member 41 from colliding with the guide hole 13.

It will be appreciated that the driving assembly 40 further includes a driving motor 43 fixed to the outer cylinder 10, and a driving gear 44 connected to a driving shaft of the driving motor 43, the driving motor 43 is preferably a stepping motor, and the driving gear 44 is engaged with the engaging teeth 451 of the focus rack 45 to transmit power. In order to facilitate the installation of the driving motor 43, the driving assembly 40 further includes a motor base 46, the driving motor 43 may be installed on the outer barrel 10 through the motor base 46, and specifically may be installed on the large section 142 of the focusing barrel 14, and when the optical coupler assembly 50 is installed, the driving motor and the optical coupler assembly 50 are disposed in a staggered manner in the circumferential direction of the outer barrel 10, for example, the driving motor and the optical coupler assembly may be disposed at two ends of the outer barrel 10 in the radial direction, as shown in fig. 3. Specifically, referring to fig. 1, the large section 142 is further provided with a motor mounting area, the motor mounting area is provided with a motor positioning hole 1424 and motor locking holes 1423 arranged in a triangle for mounting the driving motor 43, wherein two motor locking holes 1423 are arranged along the circumferential direction of the outer barrel 10, and the motor positioning hole 1424 is disposed between the two motor locking holes 1423; in the circumferential direction of the outer cylinder 10, the stopper hole 11 is located outside the motor mounting region. Correspondingly, one side of the motor base 46 facing the outer cylinder 10 is provided with a motor positioning column matched with the motor positioning hole 1424 and a motor mounting hole 461 matched with the motor locking hole 1423, and the motor base 46 is fixed on the outer cylinder 10 through the matching of the fourth locking member 540 penetrating through the motor mounting hole 461 and the motor locking hole 1423. With this structure, the positional accuracy of mounting of the drive motor 43 can be increased, and the stability of mounting of the drive motor 43 can be increased.

The projector also comprises a shell (not shown in the figure), the shell is provided with a lens hole, the lens and the optical chassis 300 are both installed in the shell, the lens is opposite to the lens hole, the lens is exposed, when the lens cover 600 is arranged, the lens cover 600 can be attached to the inner side end of the lens hole, so that the lens is protected, and meanwhile, dust and the like can be prevented from entering the shell through the gap between the shell and the lens to cause adverse effects on the projector.

The first locking member 510, the second locking member 520, the third locking member 530 and the fourth locking member 540 may be screws, bolts and other locking members, respectively.

It is understood that the lens barrel further includes a spacer, a locking ring, a sealing ring, etc. to mount each optical lens of the optical lens group 60 to the inner tube 20 through these components. The focusing mechanism 100 further comprises a control unit (not shown in the figure), the driving motor 43 and the optical coupler 52 are both connected with the control unit, and when the focusing mechanism works, the control unit can determine the rotation angle or the step number of the driving motor according to the optimal image, then drive the driving gear 44 according to the rotation angle and the step number, further enable the focusing rack 45 to drive the transmission member 41 and the sliding block 42 to slide, realize the axial movement of the inner barrel 20, perform focusing, and control the driving motor 43 to stop working according to the signal of the optical coupler 52.

It should be noted that the spiral extension described herein is an optimal state, and actually, may not be an ideal spiral extension due to the influence of the manufacturing process, and the like, and is within the protection scope of the present application, for example, although the limit sliding groove 12, the guide hole 13 and the focusing rack 45 limit the spiral extension, due to the influence of the manufacturing process, and the like, only the spiral extension is approached, especially the processing of the focusing rack 45, and the engaging teeth are further provided thereon, so that the processing difficulty is large, and the extending direction of the finally formed structure only approaches the spiral extension.

In addition, although in the above embodiments, the optical lens group 60 is installed in the lens barrel in the inner barrel 20, the auto-focusing lens 100 of the present invention is not limited to such a lens barrel, and is also applicable to other lens barrels that perform focusing through relative sliding between two opposite lens barrels, and in some lens barrels, each optical lens in the optical lens group 60 may be installed in a different lens barrel, specifically, a part of the optical lens may be installed in the first lens barrel, and a part of the optical lens may be installed in the second lens barrel, and in practical applications, the second lens barrel is fixed with the outer barrel, and focusing is performed through sliding of the first lens barrel relative to the second lens barrel, and at this time, the first lens barrel only needs to be installed as the inner barrel; or in some embodiments, the optical lens is installed on the inner cylinder and the optical lens is installed on the outer cylinder, and at this time, the structure of the automatic focusing lens 100 in the above embodiments can be basically used directly; of course, there are other arrangements of the optical lens group 60, and those skilled in the art can make adaptive modifications with reference to the above embodiments, and thus the detailed description is omitted here.

It will be appreciated by those skilled in the art that the above-described preferred embodiments may be freely combined, superimposed, without conflict.

It will be understood that the above-described embodiments are illustrative only and not restrictive, and that various obvious and equivalent modifications and substitutions may be made in the details described herein by those skilled in the art without departing from the basic principles of the invention.

Claims (12)

1. An outer cylinder (10) for an automatic focusing lens (100), wherein the automatic focusing lens (100) comprises an inner cylinder (20) which slides along the axial direction of the outer cylinder (10) and a driving component (40) which drives the inner cylinder (20) to slide, a limiting piece (30) is connected to the outer wall of the inner cylinder (20), an annular groove (21) which surrounds the inner cylinder (20) in the circumferential direction is formed in the inner cylinder (20), the driving component (40) comprises a sliding block (42) which slides along the annular groove (21), a transmission piece which is connected to the sliding block (42) and is in sliding fit with a guide hole (13) formed in the side wall of the outer cylinder (10), and a focusing rack (45), and two ends of the transmission piece are respectively connected with the sliding block (42) and the focusing rack (45); it is characterized in that the preparation method is characterized in that,

the side wall of the outer barrel (10) is provided with a limiting hole (11) and a limiting sliding groove (12) which are used for being in sliding fit with the limiting piece (30), and the limiting hole (11) extends along the axial direction of the outer barrel (10) and penetrates through an inner hole of the outer barrel (10); the limiting sliding groove (12) is used for being matched with a limiting sliding protrusion (452) on the focusing rack (45), the limiting sliding protrusion is formed by the outer wall of the outer barrel (10) in a concave mode and extends spirally around the axis of the outer barrel (10), the guide hole (13) is formed in the bottom of the limiting sliding groove (12) and is consistent with the extending direction of the limiting sliding groove (12), the central plane of the guide hole (13) and the central plane of the limiting sliding groove (12) are arranged in a deviating mode, and the central plane is parallel to the extending direction.

2. The outer cartridge (10) of claim 1 wherein the guide aperture (13) comprises first and second opposing aperture walls and the restraining runner (12) comprises first and second opposing slot walls, the first aperture wall being co-planar with the first slot wall on the same side.

3. The outer cartridge (10) of claim 1 wherein the guide aperture (13) is located in the middle of the limit runner (12) in its direction of extension.

4. The outer barrel (10) according to claim 1, wherein the outer barrel (10) comprises a focusing barrel (14) with a step structure, the limiting sliding groove (12) is arranged on a small section of the focusing barrel (14), and the limiting hole (11) is arranged on a large section of the focusing barrel (14).

5. The outer tub (10) of claim 4, characterized in that the large section is further provided with a motor mounting area provided with motor positioning holes (1424) and motor locking holes (1423) arranged in a triangle for mounting a driving motor (43) of an automatic focus lens (100), wherein two of the motor locking holes (1423) are arranged along a circumferential direction of the outer tub (10), and the motor positioning holes (1424) are provided between the two motor locking holes (1423); in the circumferential direction of the outer barrel (10), the limiting hole (11) is located on the outer side of the motor mounting area.

6. The outer barrel (10) of claim 4, wherein the large section is further provided with an optical coupler mounting area, the optical coupler mounting area is provided with an optical coupler positioning hole (1421) and an optical coupler locking hole (1422) for mounting an optical coupler assembly (50) of the automatic focusing lens (100), at least two optical coupler locking holes (1422) are staggered in the circumferential direction and the axial direction of the outer barrel (10), and the optical coupler positioning hole (1421) is arranged between the two optical coupler locking holes (1422); in the circumferential direction of the outer barrel (10), the limiting hole (11) is located on the outer side of the optical coupler mounting area.

7. The outer barrel (10) according to claim 4, wherein the outer barrel (10) further comprises a connecting flange (15) connected to an end of the large section, the connecting flange (15) is provided with a light machine mounting hole (151) for connecting with a light machine housing (300) of a projector and a positioning notch (152), and the positioning notch (152) penetrates through the connecting flange (15) along an axial direction of the outer barrel (10).

8. The outer cartridge (10) of claim 7 wherein said outer cartridge (10) further comprises an extension attached to said attachment flange (15) away from said major section, said extension adapted to extend into a light housing (300) of a projector.

9. The outer barrel (10) according to claim 4, wherein the outer barrel (10) further comprises an annular flange (17) connected to an end of the small segment, a mounting notch (171) and a cover locking hole (172) are provided on an outer side wall of the annular flange (17), the mounting notch (171) penetrates the annular flange (17) in an axial direction of the outer barrel (10), and the cover locking hole (172) and the mounting notch (171) are alternately arranged at intervals in a circumferential direction of the annular flange (17).

10. The outer cylinder (10) according to claim 9, wherein a plurality of the mounting notches (171) and the cover locking holes (172) are uniformly distributed along the circumferential direction of the annular flange (17), and in two adjacent mounting notches (171) and the cover locking holes (172) located therebetween, the distance from the cover locking hole (172) to one of the mounting notches (171) is greater than that from the other mounting notch (171).

11. An automatic focusing lens (100), comprising an outer cylinder (10) according to any one of claims 1 to 10, an inner cylinder (20) slidably inserted into the outer cylinder (10) along an axial direction of the outer cylinder (10), a driving assembly (40) for driving the inner cylinder (20) to slide, and a limiting member (30), wherein one end of the limiting member (30) is connected to the inner cylinder (20), and the other end is slidably inserted into the limiting hole (11); the inner cylinder (20) is provided with an annular groove (21) which surrounds along the circumferential direction of the inner cylinder;

the driving assembly (40) comprises a sliding block (42) sliding along the annular groove (21), a transmission piece (41) and a focusing rack (45) connected to the sliding block (42) and in sliding fit with the guide hole (13), the focusing rack (45) is located on the outer side of the outer barrel (10), meshing teeth (451) are arranged on the outer side face of the focusing rack (45), a connecting hole (453) and limiting sliding projections (452) arranged on two sides of the connecting hole are arranged on the inner side face of the focusing rack, the central faces of the two limiting sliding projections (452) are coplanar and are arranged in a mode of deviating from the central line of the connecting hole (453), the limiting sliding projections (452) are in sliding fit with the limiting sliding groove (12), one end of the transmission piece (41) is connected with the sliding block (42), and the other end of the transmission piece is in plug-in fit with the connecting hole (453).

12. A projector comprising an optical housing (300) and the automatic focus lens (100) according to claim 11, wherein the automatic focus lens (100) is mounted to the optical housing (300) through the outer cylinder (10).

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