CN220855314U - Lens capable of automatically adjusting focal length for projector - Google Patents

Abstract

The utility model relates to the technical field of projectors, and discloses an automatic focus adjusting lens for a projector. This automatically regulated focus's lens for projector carries out preliminary second grade through utilizing lenticular lens to the projection light source divergence angle of projector main part, enlarges through biconcave lens to the projection light source divergence angle after the zoom, and carry out the zoom again to the projection light source divergence angle after the zoom and crescent lens's convex surface reduces the projection light source divergence angle that enlarges once more through crescent lens's concave surface, thereby very big compression the projection light source transmission interval and the divergence angle of projector main part, drive lenticular lens on the expansion assembly through control panel control drive assembly, biconcave lens and crescent lens are close to or keep away from the projection light source of projector main part in step, realize that a plurality of lenses carry out multistage zooming in order to reduce the structure volume of camera lens and automatic accurate focusing effect.

Description

Lens capable of automatically adjusting focal length for projector

Technical Field

The utility model relates to the technical field of projectors, in particular to a lens capable of automatically adjusting focal length for a projector.

Background

Projectors (projectors), which are also called projectors, are devices that project or reflect images or videos onto a screen through digital light processing technology or LCD liquid crystal imaging technology, and can be played through different signal sources, such as computers, mobile phones, DVDs, and DVs, which are connected to corresponding images and video signals, are widely used in education, business, engineering, and home, etc., and are classified into CRT projection, LCD projection, DLP projection, and LCOS projection according to projection technology, and home theater type projectors, portable business type projectors, educational conference type projectors, mainstream engineering type projectors, professional theater type projectors, and measuring projectors according to the type of the scene used.

For example, chinese patent publication No. CN213690202U discloses a projector optical machine focal length adjusting and locking mechanism, which has a basic focal length adjusting function, but it needs manual adjustment, which is inconvenient for a user to quickly and accurately adjust the zoom multiple of the focal length, and the structure of the lens is single, the volume is large, which results in a smaller range value of the overall focal length of the projector, and the user needs to move the placement position of the projector to meet the requirement of adjusting the zoom ratio when adjusting, which causes inconvenient use, so that an automatic focal length adjusting lens for the projector is provided to solve the above problems.

Disclosure of utility model

(One) solving the technical problems

Aiming at the defects of the prior art, the utility model provides an automatic focus-adjusting lens for a projector, which has the advantages that a plurality of lenses are adopted to carry out multistage zooming so as to reduce the structural volume of the lens, and the automatic accurate focusing is realized by matching with a telescopic component, a driving component and a control panel, and the like, and solves the problems that the use is inconvenient because a projector optical machine focus-adjusting locking mechanism with a Chinese patent publication number of CN213690202U has a basic focus-adjusting function, but needs manual adjustment, is inconvenient for a user to quickly and accurately adjust the zooming multiple of the focus, the structure of the lens is single, the volume is large, the range value of the overall focus-adjusting focal length of the projector is small, and the user usually needs to move the placement position of the projector to meet the requirement of adjusting the zooming proportion during adjustment.

(II) technical scheme

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides an automatic focal length adjusting lens for projector, including the projector main part, be provided with control panel in the projector main part, be provided with telescopic assembly in the projector main part, telescopic assembly's activity is served and along the projection light source direction of projector main part coaxial line in proper order is provided with the biconvex lens, biconcave lens and crescent lens, biconvex lens keeps away from biconcave lens's one side radius of curvature is less than biconcave lens and is close to biconcave lens's one side radius of curvature, biconcave lens's one side radius of curvature is less than crescent lens and is close to biconcave lens's one side radius of curvature is kept away from biconcave lens to crescent lens, be provided with the drive assembly who is used for driving telescopic assembly flexible in the projector main part, control panel is connected with the drive assembly electricity and is used for controlling biconvex lens on the telescopic assembly, biconcave lens and crescent lens are close to or keep away from the projection light source of projector main part in step.

Preferably, the telescopic assembly comprises a first rotary drum, a second rotary drum and a first positioning drum, wherein the first positioning drum is relatively and fixedly arranged in the projector main body, one end of the first positioning drum is coaxially provided with the first rotary drum in a rotating manner, the second rotary drum extending into the first positioning drum is coaxially arranged in the first rotary drum, a biconvex lens, a biconcave lens and a crescent lens are sequentially and coaxially arranged in the first rotary drum along the projection light source direction of the projector main body, the inner wall of the first positioning drum is provided with a spiral part meshed with the outer wall of the second rotary drum, the inner wall of the first rotary drum is provided with a linear limiting part meshed with the outer wall of the second rotary drum, and the linear limiting part is used for limiting the axial linear sliding of the first rotary drum relative to the second rotary drum;

The driving assembly comprises a first motor and a first gear, the first motor is arranged in the projector main body and is electrically connected with the control panel, the first gear is arranged on an output shaft of the first motor, and a first tooth part meshed with the first gear is arranged on the outer wall of the first rotary drum.

Preferably, the first positioning cylinder comprises a core cylinder and a C-shaped compression ring, the core cylinder is fixedly arranged in the projector main body, a spiral part meshed with the outer wall of the second rotary cylinder is arranged in the core cylinder, and the C-shaped compression ring is detachably arranged on the core cylinder;

The first rotary drum comprises a drum body, an annular limiting part, a first positioning protrusion and a second positioning protrusion, one end of the drum body extends between the core drum and the C-shaped pressing ring, the inner wall of the drum body is provided with a linear limiting part meshed with the outer wall of the second rotary drum, the annular limiting part is arranged on the drum body and between the core drum and the C-shaped pressing ring, a first tooth part is arranged on the annular limiting part, the outer wall of the drum body is provided with the first positioning protrusion and the second positioning protrusion at intervals, the core drum is provided with a first sensor for detecting the positions of the first positioning protrusion and the second positioning protrusion, and the output end of the first sensor is electrically connected with the input end of the control panel.

Preferably, the telescopic component comprises a second positioning cylinder and a third positioning cylinder, the second positioning cylinder is fixedly arranged in the projector main body, the third positioning cylinder is axially and slidably arranged in the second positioning cylinder, a biconvex lens, a biconcave lens and a crescent lens are coaxially arranged in the third positioning cylinder and in sequence along the projection light source direction of the projector main body, a positioning groove is formed in the second positioning cylinder, and a guide part penetrating through the positioning groove and extending out of the second positioning cylinder is arranged on the third positioning cylinder;

The driving assembly comprises a second motor and a second gear, the second motor is arranged on the second positioning cylinder and is electrically connected with the control panel, the output shaft of the second motor is provided with the second gear which extends into the positioning groove, and the outer wall of the third positioning cylinder is provided with a second tooth part meshed with the second gear.

Preferably, the guide part comprises a third positioning protrusion and a fourth positioning protrusion, the third positioning protrusion and the fourth positioning protrusion are arranged on the third positioning cylinder at intervals, a second sensor used for positioning the third positioning protrusion and the fourth positioning protrusion is arranged on the third positioning protrusion, and the output end of the second sensor is electrically connected with the input end of the control panel.

Preferably, the biconvex lens, biconcave lens and crescent lens are all detachably connected to the telescopic assembly.

Preferably, one end of the second rotary drum or the third positioning drum, which is close to the projection light source of the projector main body, is provided with a limiting protrusion, one end of the second rotary drum or the third positioning drum, which is far away from the projection light source of the projector main body, is in threaded connection with a gland, a first positioning ring is arranged in the second rotary drum or the third positioning drum and between the biconvex lens and the biconcave lens, and a second positioning ring is arranged in the second rotary drum or the third positioning drum and between the biconvex lens and the crescent lens.

Preferably, a protective cover is detachably arranged on the projector main body and positioned on one side of the crescent lens away from the biconvex lens.

Preferably, the protective cover is provided with a bayonet lock which is clamped with the projector main body.

(III) beneficial effects

Compared with the prior art, the utility model provides the lens with the automatic focal length adjustment for the projector, which has the following beneficial effects:

This automatically regulated focus's lens for projector carries out preliminary secondary through utilizing lenticular lens to the projection light source divergence angle of projector main part and reduces, the rethread biconcave lens carries out the secondary to the projection light source divergence angle after the secondary zoom and enlarges, and carry out the projection light source divergence angle that enlarges once more and the convex surface of crescent lens reduces the projection light source divergence angle that enlarges once more through the concave surface of crescent lens, thereby very big compression the projection light source transmission interval and the divergence angle of projector main part, finally drive lenticular lens on the telescopic assembly through control panel control drive assembly, biconcave lens and crescent lens are close to or keep away from the projection light source of projector main part in step, simply conveniently adopt a plurality of lenses to carry out multistage zooming in order to reduce the structure volume of camera lens and cooperate telescopic assembly, drive assembly and control panel realize automatic accurate focusing's effect, simultaneously carry out multistage zooming through a plurality of lenses and effectively avoid the projector lens in-process divergence angle too big and cause the projection light source of projector main part to influence the condition such as adjusting precision and projection effect to take place.

Drawings

FIG. 1 is an exploded view of a lens structure with an automatically adjustable focal length for a projector according to the present utility model;

FIG. 2 is a cross-sectional view of an auto-focus lens for a projector according to the present utility model;

FIG. 3 is a partial perspective view of an embodiment of the present utility model;

FIG. 4 is an exploded view of a partial structure of an embodiment of the present utility model;

FIG. 5 is a partial cross-sectional view of a second embodiment of the present utility model;

fig. 6 is an exploded view of a partial structure according to the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-6, an automatically focal length-adjusting lens for a projector includes a projector main body 1, a control panel 2 is provided on the projector main body 1, the control panel 2 can be directly and manually controlled, the control panel 2 can also be remotely controlled by a remote controller, the specific control mode of the control panel 2 can be determined according to actual requirements, a telescopic component 3 is provided in the projector main body 1, a biconvex lens 4, a biconcave lens 5 and a crescent lens 6 are coaxially provided on a movable end of the telescopic component 3 and along a projection light source direction of the projector main body 1in sequence, a curvature radius of one side of the biconcave lens 4 far from the biconcave lens 5 is smaller than a curvature radius of one side of the biconcave lens 4 near the biconcave lens 5, a curvature radius of two sides of the biconcave lens 5 is equal, a curvature radius of one side of the crescent lens 6 far from the biconcave lens 5 is smaller than a curvature radius of one side of the crescent lens 6 near the biconcave lens 5, a driving component 7 is provided on the projector main body 1 for driving the telescopic component 3, the control panel 2 is electrically connected with the driving component 7 and is used for controlling the biconcave lens 4, the biconcave lens 5 and the crescent lens 6 on the telescopic component 3 to synchronously approach or keep away from the projection light source of the projector main body 1; the projection light source divergence angle of the projector main body 1 is primarily secondarily reduced by utilizing the two convex surfaces of the biconvex lens 4, the secondarily reduced projection light source divergence angle is secondarily enlarged by utilizing the two concave surfaces of the biconcave lens 5, the secondarily enlarged projection light source divergence angle is secondarily enlarged by utilizing the concave surfaces of the crescent lens 6, and the secondarily enlarged projection light source divergence angle is reduced by utilizing the convex surfaces of the crescent lens 6, so that the projection light source transmission distance and the divergence angle of the projector main body 1 are greatly compressed, finally, the biconcave lens 4, the biconcave lens 5 and the crescent lens 6 on the telescopic assembly 3 are synchronously close to or far away from the projection light source of the projector main body 1 by controlling the driving assembly 7 through the control panel 2, namely, the multi-stage zooming is simply and conveniently carried out by adopting a plurality of lenses to reduce the whole structure volume of the lenses and realize the automatic and accurate focusing effect by matching the telescopic assembly 3, the driving assembly 7 and the control panel 2, meanwhile, as the curvature radius of one side of the biconvex lens 4 away from the biconcave lens 5 is smaller than that of one side of the biconvex lens 4 close to the biconcave lens 5, the curvature radii of two sides of the biconcave lens 5 are equal, the curvature radius of one side of the crescent lens 6 away from the biconcave lens 5 is smaller than that of one side of the crescent lens 6 close to the biconcave lens 5, namely the integral zoom multiple of the divergence angle of the convex surface of the biconvex lens 4 close to the projection light source side of the projector main body 1 to the projection light source is larger than the convex surface zoom ratio of the biconvex lens 4 close to the biconcave lens 5, the concave surface zoom ratio of the crescent lens 6 is smaller than the convex surface zoom ratio of the crescent lens 6, and in the technical scheme, the adjustment of the biconcave lens 4, the biconcave lens 5 and the crescent lens 6 is relatively synchronous, namely fixed, so that the telescopic component 3 is effectively prevented from adjusting the biconvex lens 4, the situation that the projection light source of the projector main body 1 is shielded by the projection light source to influence the adjusting precision, the projection effect and the like due to overlarge divergence angle of the projection light source of the projector main body 1 occurs in the process of the biconcave lens 5 and the crescent lens 6, and the distortion of the projector is minimized, namely, the automatic focal length adjusting precision, the projection quality and the user experience of the projector are further improved.

On the basis of the above technical solution, the telescopic assembly 3 specifically includes a first drum 31, a second drum 32 and a first positioning drum 33, as shown in fig. 1-4, the first positioning drum 33 is relatively and fixedly installed in the projector main body 1, one end of the first positioning drum 33 is coaxially rotated to provide the first drum 31, the second drum 32 extending into the first positioning drum 33 is coaxially rotated in the first drum 31, the biconvex lens 4, biconcave lens 5 and crescent lens 6 are coaxially provided in the first drum 31 and sequentially along the projection light source direction of the projector main body 1, the inner wall of the first positioning drum 33 is provided with a spiral part a meshed with the outer wall of the second drum 32, the spiral part a may be a spiral groove or the spiral part a may be a spiral protrusion, as long as it is ensured that the second drum 32 can simultaneously axially expand and contract relative to the first positioning drum 33 in the rotation process of the first positioning drum 33, the inner wall of the first rotary drum 31 is provided with a linear limit part b meshed with the outer wall of the second rotary drum 32, the linear limit part b is used for limiting the first rotary drum 31 to axially and linearly slide relative to the second rotary drum 32, the linear limit part b is a linear chute, the outer wall of the first rotary drum 31 is provided with a limit protrusion extending into the linear chute, or the linear limit part b is a linear strip protrusion, the outer wall of the first rotary drum 31 is provided with a limit groove matched with the linear strip protrusion, as long as the first rotary drum 31 and the second rotary drum 32 can synchronously rotate and relatively axially slide under the action of a spiral part a of the first positioning drum 33, the driving assembly 7 comprises a first motor 71 and a first gear 72, the first motor 71 is arranged in the projector main body 1 and electrically connected with the control panel 2, the output shaft of the first motor 71 is provided with the first gear 72, the outer wall of the first rotary drum 31 is provided with a first tooth part c meshed with the first gear 72; the first motor 71 is controlled by the control panel 2 to drive the first gear 72 to rotate, the first gear 72 interacts with the first tooth part c and drives the first rotary drum 31 to rotate, the first rotary drum 31 rotates and drives the second rotary drum 32 to rotate through the linear limiting part b, the outer wall of the second rotary drum 32 interacts with the spiral part a of the inner wall of the first positioning drum 33 in the rotating process, and the first positioning drum 33 is fixed relative to the projector main body 1, so that the second rotary drum 32 axially stretches and contracts relative to the first positioning drum 33 and the first rotary drum 31, namely, the projection light source of the biconvex lens 4, the biconcave lens 5 and the crescent lens 6 in the first rotary drum 31 is close to or far away from the projection light source of the projector main body 1, the projection area of the projection light source of the biconvex lens 4 is adjusted, and the projection size is changed in the adjusting process by the biconvex lens 4, the biconcave lens 5 and the crescent lens 6, so that the focal length and the projection size are simply, conveniently, rapidly, accurately and automatically adjusted, automatically, and accurately, and the projection is small in a way, so that a plurality of lenses are satisfied to carry out multistage zooming to reduce the structure volume and automatically, and the effect of the lens is realized, and the user experience is improved.

Further, the first positioning cylinder 33 includes a core cylinder 331 and a C-shaped pressing ring 332, the core cylinder 331 is fixedly installed in the projector main body 1, a spiral part a meshed with the outer wall of the second rotary cylinder 32 is arranged in the core cylinder 331, and the C-shaped pressing ring 332 is detachably installed on the core cylinder 331; the first rotary drum 31 comprises a drum 311, an annular limiting part 312, a first positioning protrusion 313 and a second positioning protrusion 314, one end of the drum 311 extends between the core drum 331 and the C-shaped pressing ring 332, a linear limiting part b meshed with the outer wall of the second rotary drum 32 is arranged on the inner wall of the drum 311, the annular limiting part 312 is arranged on the drum 311 and between the core drum 331 and the C-shaped pressing ring 332, a first tooth part C is arranged on the annular limiting part 312, the first positioning protrusion 313 and the second positioning protrusion 314 are arranged on the outer wall of the drum 311 at intervals, a first sensor d for detecting the positions of the first positioning protrusion 313 and the second positioning protrusion 314 is arranged on the core drum 331, and the output end of the first sensor d is electrically connected with the input end of the control panel 2; the annular limiting part 312 on the cylinder 311 is matched with the C-shaped compression ring 332 on the core cylinder 331 to limit the axial telescopic distance and the radial rotary distance between the first positioning cylinder 33 and the first rotary cylinder 31, so that the first gear 72 on the first motor 71 drives the first tooth part C on the first rotary cylinder 31 to operate more stably in the rotary process, the situation that the rotation stability of the first rotary cylinder 31 is poor or the scaling multiple adjusting precision of the biconvex lens 4, the biconcave lens 5 and the crescent lens 6 on the second rotary cylinder 32 is influenced due to the axial telescopic distance between the first positioning cylinder 33 and the first rotary cylinder 31 is avoided, the first sensor d on the core cylinder 331 is matched with the first positioning protrusion 313 and the second positioning protrusion 314 on the cylinder 311 to detect the maximum operation rotary distance between the first rotary cylinder 31 and the second rotary cylinder 32 and feed back detection data to the control panel 2, the control panel 2 can calibrate the rotation circle number of the first rotary cylinder 31 and the telescopic distance between the second rotary cylinder 32 relative to the first rotary cylinder 31, the situation that the first motor 71 drives the rotation amplitude of the first rotary cylinder 31 is excessively large to cause the second rotary cylinder 31 to drop off the second rotary cylinder 31 or the scaling multiple adjusting precision of the crescent lens 6 is avoided, the first sensor d on the first motor 331 is matched with the first rotary cylinder 31 and the second rotary cylinder 31 is also prevented from falling off, the second rotary cylinder 31 is matched with the second rotary cylinder 31, the scaling precision is adjusted to realize the fact that the scaling precision is different from the first rotary cylinder 31, the rotating precision is matched with the first rotary cylinder 31, and the rotating precision is adjusted.

In the second embodiment, the difference from the first embodiment is that the specific structure of the telescopic assembly 3 is different, as shown in fig. 5, specifically, the telescopic assembly 3 includes a second positioning cylinder 34 and a third positioning cylinder 35, the second positioning cylinder 34 is fixedly installed in the projector main body 1, the third positioning cylinder 35 is slidably disposed in the second positioning cylinder 34 along the axial direction, a biconvex lens 4, a biconcave lens 5 and a crescent lens 6 are coaxially disposed in the third positioning cylinder 35 in sequence along the projection light source direction of the projector main body 1, a plurality of positioning slots 36 are formed in the second positioning cylinder 34, and a guide portion 37 penetrating the positioning slots 36 and extending out of the second positioning cylinder 34 is disposed on the third positioning cylinder 35; the driving assembly 7 comprises a second motor 73 and a second gear 74, the second motor 73 is arranged on the second positioning cylinder 34 and is electrically connected with the control panel 2, the second gear 74 extending into the positioning groove 36 is arranged on the output shaft of the second motor 73, and a second tooth e meshed with the second gear 74 is arranged on the outer wall of the third positioning cylinder 35; the positioning groove 36 on the second positioning cylinder 34 is matched with the guide part 37 on the third positioning cylinder 35 to coaxially and linearly stretch and limit the second positioning cylinder 34 and the third positioning cylinder 35, the second motor 73 is controlled by the control panel 2 to drive the second gear 74 to rotate forward or in the direction, the projection light source of the biconvex lens 4, the biconcave lens 5 and the crescent lens 6 in the third positioning cylinder 35 is further adjusted to be close to or far away from the projection light source of the projector main body 1, the projection area of the projection light source incident on the biconvex lens 4 is further adjusted, and then the focal length and the projection size of the projection are changed by the biconvex lens 4, the biconcave lens 5 and the crescent lens 6 in the adjusting process, so that the focal length and the projection zoom are simply, conveniently, quickly, accurately and automatically adjusted, and the zoom is small, a plurality of lenses are zoomed in multiple stages to reduce the structural volume of the lens, the effect of automatic and accurate focusing is realized by matching with the control panel 2, and the use experience of a user is improved.

Further, the guide portion 37 includes a third positioning protrusion 371 and a fourth positioning protrusion 372, the third positioning protrusion 371 and the fourth positioning protrusion 372 are arranged on the third positioning cylinder 35 at intervals, a second sensor f for adjusting the distance between the third positioning cylinder 35 and the second positioning cylinder 34 is arranged on the third positioning protrusion 371, the output end of the second sensor f is electrically connected with the input end of the control panel 2, the guide portion 37 includes the third positioning protrusion 371 and the fourth positioning protrusion 372 and is matched with the second sensor f in the technology of the second embodiment, the detection is performed on the maximum operation coaxial linear operation interval of the third positioning cylinder 35 relative to the second positioning cylinder 34, the detection data is fed back to the control panel 2, the control panel 2 can calibrate the distance between the third positioning cylinder 35 of the third positioning cylinder 35 relative to the second positioning cylinder 34, the situation that the distance between the third positioning cylinder 35 and the second positioning cylinder 34 is too large due to the fact that the linear motion amplitude of the second motor 73 drives the third positioning cylinder 35 is too large is avoided, the fact that the distance between the third positioning cylinder 35 and the second positioning cylinder 34 is too large is not matched with the second positioning cylinder 34 is achieved, or the fact that the adjustment accuracy of the adjustment of the focal length of the second positioning cylinder is not achieved is achieved, or the adjustment of the automatic adjustment accuracy of the adjustment of the focal length is achieved, and the adjustment is not suitable for the actual adjustment of the distance of the second positioning projector, and the adjustment technology is achieved.

Further, through lenticular lens 4, biconcave lens 5 and crescent moon lens 6 all detachably connect with flexible subassembly 3, and then make the user change the applicable scope of this projecting apparatus focusing with further improvement according to actual demand lenticular lens 4, biconcave lens 5 and crescent moon lens 6 of different curvature radius in the use, effectively avoid single lenticular lens 4, biconcave lens 5 or crescent moon lens 6 to lead to the fact the condemned wasting of resources of whole projecting apparatus or influence condition such as projection quality to take place because of the fish tail or damage simultaneously.

Further, a limiting protrusion a1 is disposed at one end of the second rotary drum 32 or the third positioning drum 35, which is close to the projection light source of the projector main body 1, one end of the second rotary drum 32 or the third positioning drum 35, which is far away from the projection light source of the projector main body 1, is in threaded connection with a gland a2, a first positioning ring a3 is disposed between the biconvex lens 4 and the biconcave lens 5 in the second rotary drum 32 or the third positioning drum 35, a second positioning ring a4 is disposed between the biconvex lens 4 and the crescent lens 6 in the second rotary drum 32 or the third positioning drum 35, and the adjusting distance between the control panel 2 and the driving assembly 7 driving the telescopic assembly 3 is further adjusted to correspond to the change rate of the biconvex lens 4, the biconcave lens 5 and the biconcave lens 6 of the projector as a whole by rotating the gland a2, the first positioning ring a3, the biconcave lens 5, the second positioning ring a4 and the crescent lens 6, or taking out from the second rotary drum 32 or the third positioning drum 35, and changing the first positioning ring a3 and the second positioning ring a4 with different thicknesses.

Further, the protective cover 8 is detachably arranged on one side, far away from the biconvex lens 4, of the crescent lens 6 through the projector main body 1, so that the situations that dust enters the projector main body 1 in the process of not using the projector main body 1 and is adhered to the biconvex lens 4, the biconcave lens 5 and the crescent lens 6 to influence the projection quality for next use, or the crescent lens 6 is easily scratched by external sharp objects to influence the projection quality of the projector, the service life of the projector and the like are effectively avoided.

Further, be provided with the bayonet lock g mutually with projector main part 1 joint on the protective cover 8 to be convenient for install protective cover 8 with projector main part 1 fast and dismantle, be connected through the rope between protective cover 8 and the projector main part 1, effectively avoid protective cover 8 easily losing and cause the dust to get into in the projector main part 1 adhesion in lenticular lens 4, biconcave lens 5 and crescent moon lens 6 on influencing the projection quality of using next time, perhaps external sharp object easily fish tail crescent moon lens 6 and influence the condition such as this projector projection quality and life take place.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (9)

1. The utility model provides a camera lens of automatically regulated focus for projecting apparatus, includes projecting apparatus main part (1), is provided with control panel (2), its characterized in that on projecting apparatus main part (1): be provided with flexible subassembly (3) in projector main part (1), on the activity end of flexible subassembly (3) and along the projection light source direction of projector main part (1) coaxial line in proper order is provided with biconvex lens (4), biconcave lens (5) and crescent lens (6), one side curvature radius that biconcave lens (5) was kept away from to biconcave lens (4) is less than one side curvature radius that biconcave lens (5) was close to biconcave lens (4), the curvature radius of biconcave lens (5) both sides equals, one side curvature radius that crescent lens (6) was kept away from biconcave lens (5) is less than one side curvature radius that crescent lens (6) was close to biconcave lens (5), be provided with on projector main part (1) and be used for driving flexible drive assembly (7) of flexible subassembly (3), control panel (2) are connected with drive assembly (7) electricity and are used for controlling the projection light source that biconcave lens (4), biconcave lens (5) and crescent lens (6) are close to or keep away from projector main part (1) in step.

2. The automatically focus-adjusting lens for a projector according to claim 1, wherein: the telescopic assembly (3) comprises a first rotary drum (31), a second rotary drum (32) and a first positioning drum (33), wherein the first positioning drum (33) is fixedly installed in the projector main body (1) relatively, one end of the first positioning drum (33) is coaxially rotated to be provided with the first rotary drum (31), the first rotary drum (31) is coaxially rotated to be provided with a second rotary drum (32) extending into the first positioning drum (33), a biconvex lens (4), a biconcave lens (5) and a crescent lens (6) are coaxially arranged in the first rotary drum (31) and sequentially along the projection light source direction of the projector main body (1), the inner wall of the first positioning drum (33) is provided with a spiral part (a) meshed with the outer wall of the second rotary drum (32), the inner wall of the first rotary drum (31) is provided with a linear limiting part (b) meshed with the outer wall of the second rotary drum (32), and the linear limiting part (b) is used for limiting the first rotary drum (31) to axially and linearly slide relatively to the second rotary drum (32);

The driving assembly (7) comprises a first motor (71) and a first gear (72), the first motor (71) is arranged in the projector main body (1) and is electrically connected with the control panel (2), the first gear (72) is arranged on an output shaft of the first motor (71), and a first tooth part (c) meshed with the first gear (72) is arranged on the outer wall of the first rotating cylinder (31).

3. The automatically focus-adjusting lens for a projector according to claim 2, wherein: the first positioning cylinder (33) comprises a core cylinder (331) and a C-shaped compression ring (332), the core cylinder (331) is fixedly arranged in the projector main body (1), a spiral part (a) meshed with the outer wall of the second rotary cylinder (32) is arranged in the core cylinder (331), and the C-shaped compression ring (332) is detachably arranged on the core cylinder (331);

The first rotary drum (31) comprises a drum body (311), an annular limiting part (312), a first positioning protrusion (313) and a second positioning protrusion (314), one end of the drum body (311) extends between a core drum (331) and a C-shaped pressing ring (332), a linear limiting part (b) meshed with the outer wall of the second rotary drum (32) is arranged on the inner wall of the drum body (311), the annular limiting part (312) is arranged between the core drum (331) and the C-shaped pressing ring (332), a first tooth part (C) is arranged on the annular limiting part (312), a first positioning protrusion (313) and a second positioning protrusion (314) are arranged on the outer wall of the drum body (311) at intervals, a first sensor (d) used for detecting the positions of the first positioning protrusion (313) and the second positioning protrusion (314) is arranged on the core drum (331), and the output end of the first sensor (d) is electrically connected with the input end of the control panel (2).

4. The automatically focus-adjusting lens for a projector according to claim 1, wherein: the telescopic component (3) comprises a second positioning cylinder (34) and a third positioning cylinder (35), the second positioning cylinder (34) is fixedly arranged in the projector main body (1), the third positioning cylinder (35) is axially and slidably arranged in the second positioning cylinder (34), a biconvex lens (4), a biconcave lens (5) and a crescent lens (6) are coaxially arranged in the third positioning cylinder (35) and sequentially along the projection light source direction of the projector main body (1), a positioning groove (36) is formed in the second positioning cylinder (34), and a guide part (37) penetrating through the positioning groove (36) and extending out of the second positioning cylinder (34) is arranged on the third positioning cylinder (35);

The driving assembly (7) comprises a second motor (73) and a second gear (74), the second motor (73) is arranged on the second positioning cylinder (34) and is electrically connected with the control panel (2), the second gear (74) extending into the positioning groove (36) is arranged on the output shaft of the second motor (73), and a second tooth part (e) meshed with the second gear (74) is arranged on the outer wall of the third positioning cylinder (35).

5. The automatically focus-adjusting lens for a projector as claimed in claim 4, wherein: the guide part (37) comprises a third positioning protrusion (371) and a fourth positioning protrusion (372), the third positioning protrusion (371) and the fourth positioning protrusion (372) are arranged on the third positioning cylinder (35) at intervals, a second sensor (f) used for the positions of the third positioning protrusion (371) and the fourth positioning protrusion (372) is arranged on the third positioning protrusion (371), and the output end of the second sensor (f) is electrically connected with the input end of the control panel (2).

6. An automatically adjustable focus lens for a projector according to any one of claims 1 to 5, wherein: the biconvex lens (4), the biconcave lens (5) and the crescent lens (6) are detachably connected with the telescopic component (3).

7. The automatically focus-adjusting lens for a projector as claimed in claim 6, wherein: the projection light source one end of the second rotary drum (32) or the third positioning drum (35) which is close to the projector main body (1) is provided with a limit bulge (a 1), one end of the projection light source, which is far away from the projector main body (1), of the second rotary drum (32) or the third positioning drum (35) is in threaded connection with a gland (a 2), a first positioning ring (a 3) is arranged in the second rotary drum (32) or the third positioning drum (35) and between the biconvex lens (4) and the biconcave lens (5), and a second positioning ring (a 4) is arranged in the second rotary drum (32) or the third positioning drum (35) and between the biconvex lens (4) and the crescent lens (6).

8. The automatically focus-adjusting lens for a projector as claimed in claim 6, wherein: a protective cover (8) is detachably arranged on the projector main body (1) and positioned on one side of the crescent lens (6) away from the biconvex lens (4).

9. The automatically focus-adjusting lens for a projector as claimed in claim 8, wherein: the protective cover (8) is provided with a clamping pin (g) which is clamped with the projector main body (1).