Telescopic lens assembly and ray machine

Abstract

The embodiment of the utility model relates to the technical field of lens lifting, and discloses a telescopic lens assembly and an optical machine, the telescopic lens assembly comprises: an outer cylinder, the side wall of which is provided with a first guide groove, and the first guide groove is spiral; the inner barrel is sleeved with the outer barrel, a second guide groove is formed in the side wall of the inner barrel, and the second guide groove is linear; the motor module is connected with the outer barrel and used for driving the first guide groove to rotate; the lens module is arranged in the inner barrel in a sleeving manner, and a rotating column is arranged on the lens module; and the rotating column penetrates through the second guide groove and is inserted into the first guide groove, and is used for translating relative to the inner barrel body along the extension direction of the second guide groove when the first guide groove rotates, so as to drive the lens module to stretch relative to the inner barrel body. In this way, the stability of the lens in the lifting process is improved.

Description

Technical Field

[0001] The present application relates to the field of lens lifting technology, and in particular to a telescopic lens assembly and an optical machine. Background Art

[0002] A projector is usually equipped with a projection lens, and the lens needs to be telescopically moved to adjust the clarity of the projection.

[0003] Prior art, such as Chinese patent publication number "CN 219872090 U," discloses a telescopic lens structure. A rotating rod is rotatably mounted within a protective housing. A guide slot is defined in the rotating rod, and a follower rod is fixedly mounted on the lens barrel, slidably connected to the guide slot. The follower rod is fixedly connected to the lens barrel, and a drive motor controls the rotation of the rotating rod to achieve automatic adjustment. The guide slot on the rotating rod engages the follower rod, causing the lens barrel to reciprocate and translate as the rotating rod rotates, adjusting its telescopic properties.

[0004] However, during the sliding process in which the rotating rod rotates and drives the driven rod to slide, the rotating rod and the transmission rod may slip, causing the lens barrel to rise and fall unsteadily, or even causing the lens to tilt slightly.

[0005] Therefore, how to improve the stability of the lens during the lifting process has become a technical problem that needs to be solved urgently. Utility Model Content

[0006] In view of the above problems, an embodiment of the present application provides a telescopic lens assembly and an optical machine to improve the stability of the lens during the lifting and lowering process.

[0007] According to one aspect of an embodiment of the present application, a telescopic lens assembly is provided, which includes: an outer cylinder, a side wall of which is provided with a first guide groove, which is spiral; an inner cylinder, which is sleeved in the outer cylinder, a side wall of which is provided with a second guide groove, which is linear; a motor module, which is connected to the outer cylinder and is used to drive the first guide groove to rotate; a lens module, which is sleeved in the inner cylinder, and a rotating column is provided on the lens module; the rotating column passes through the second guide groove and is inserted into the first guide groove, and is used to translate relative to the inner cylinder along the extension direction of the second guide groove when the first guide groove rotates, so as to drive the lens module to telescope relative to the inner cylinder.

[0008] Preferably, the lens module includes a lens barrel and a base, the base is fixed to the bottom of the lens barrel; the rotating column is provided on one end of the base close to the lens barrel, and passes through the second guide groove and the first guide groove in sequence; the base is used to drive the lens barrel to translate under the movement of the rotating column, and the base is used to translate forward relative to the inner cylinder body when performing a circling motion in the first guide groove, and translate backward relative to the inner cylinder body when performing a rotary motion in the first guide groove.

[0009] Preferably, at least three rotating columns are provided on the base, and the at least three rotating columns are arranged in a centrally symmetrical manner. The inner cylinder is provided with a plurality of second guide grooves adapted to the at least three rotating columns, and the inner cylinder is provided with a plurality of first guide grooves corresponding to the at least three rotating columns, and each rotating column passes through the second guide groove and the first guide groove corresponding to the rotating column in sequence.

[0010] Preferably, a gear disc is provided on the outer side of the bottom of the outer cylinder, the output gear of the motor module is engaged with the gear disc, and the center distance of the output gear is smaller than the center distance of the gear disc.

[0011] Preferably, the motor module includes: a motor for driving the output gear to rotate; and a mainboard electrically connected to the motor for controlling the motor to rotate forward and reverse.

[0012] Preferably, the motor module also includes: a motor housing, the motor and the main board are arranged at the bottom of the motor housing; a central gear, arranged in the motor housing, connected to the output shaft of the motor, and used to rotate under the drive of the motor; a driven gear set, arranged in the motor housing, the driven gear set includes an input driven gear and an output driven gear, the input driven gear is meshed with the central gear, and is used to rotate under the drive of the central gear and drive the output driven gear to rotate; a support column, the support column passes through the top of the motor housing, one end extends into the motor housing and is fixed to the output driven gear, and the other end extends to the outside of the motor housing and is fixed to the output gear, and is used to drive the output gear to rotate under the rotation of the output driven gear.

[0013] Preferably, a plurality of ventilation holes are provided at the bottom of the motor housing.

[0014] Preferably, the telescopic lens assembly also includes a base plate; the outer cylinder can be rotatably fixed to the base plate, and the inner cylinder is fixed to the base plate; the lens module passes through the base plate and is sleeved on the inner cylinder, and is used to rise and fall relative to the base plate when the first guide groove rotates; a motor housing, a fixing part is provided on the top of the motor housing, the motor housing passes through the base plate from the side of the base plate away from the outer cylinder, the fixing part is fixed to the side of the base plate close to the outer cylinder, and the output gear and the gear disc are located on the same horizontal plane.

[0015] Preferably, the telescopic lens assembly also includes an outer shell, which includes: an annular portion, which is fixed to the base plate and is arranged around the outside of the bottom of the outer cylinder to close the gear disk; a shell portion, which is connected to the annular portion, and the output gear and the support column are enclosed inside the shell portion.

[0016] According to another aspect of an embodiment of the present application, an optical machine is provided, comprising the telescopic lens assembly as described in any of the above embodiments.

[0017] The embodiment of the present application arranges the lens module within the inner cylinder so that when the lens module is extended or retracted relative to the inner cylinder, the inner cylinder does not move, thereby limiting the deviation of the lens module by the inner cylinder to improve the stability of the lens module during the lifting process; by inserting the rotating column through the second guide groove and connecting it to the first guide groove, when the first guide groove rotates, the rotating column translates relative to the inner cylinder along the extension direction of the second guide groove to drive the lens module to extend or retract relative to the inner cylinder, so that the rotating column can only move along the second guide groove. When the rotating column is subjected to the force of the first guide groove and slips relative to the first guide groove, it will be difficult for it to deviate due to the limit of the second guide groove, thereby ensuring smooth lifting and lowering of the lens module.

[0018] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0020] Figure 1 A perspective view of an optical machine provided in an embodiment of the present application is shown;

[0021] Figure 2 The embodiment of the present application provides Figure 1 Exploded view of the telescopic lens assembly;

[0022] Figure 3 The embodiment of the present application provides Figure 2 Enlarged view of part A;

[0023] Figure 4 The embodiment of the present application provides Figure 1 Partial exploded view of the Zhongguang machine;

[0024] Figure 5 A stereoscopic view of a telescopic lens assembly provided in an embodiment of the present application is shown.

[0025] The accompanying drawings in the specific implementation manner are as follows:

[0026] 1. Optical machine;

[0027] 10. Telescopic lens assembly;

[0028] 100, lens module; 110, base; 111, rotating column; 120, lens barrel;

[0029] 200, motor module; 210, motor; 220, main board; 230, motor housing; 231, fixing part;

[0030] 241. Output gear; 242. Center gear; 243. Input driven gear; 244. Output driven gear; 245. Support column; 246. Ventilation hole;

[0031] 300, outer cylinder; 310, first guide groove; 320, toothed disc;

[0032] 400, inner cylinder, 410, second guide groove;

[0033] 500, bottom plate;

[0034] 600, outer shell; 610, annular portion; 620, shell portion. DETAILED DESCRIPTION

[0035] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0037] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0038] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0040] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0041] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0042] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0043] The telescopic lens assembly provided in the embodiment of the present application is applicable to various optical machines that require a telescopic lens function, such as projectors, cameras, etc.

[0044] See also Figures 1 to 5The embodiment of the present application provides a telescopic lens assembly, which includes: an outer cylinder 300, a side wall of which is provided with a first guide groove 310, and the first guide groove 310 is spiral; an inner cylinder 400, which is sleeved in the outer cylinder 300, and a side wall of which is provided with a second guide groove 410, and the second guide groove 410 is linear; a motor module 200, connected to the outer cylinder 300, and used for driving the first guide groove 310 to rotate; a lens module 100, which is sleeved in the inner cylinder 400, and a rotating column 111 is provided on the lens module 100; the rotating column 111 passes through the second guide groove 410 and is inserted into the first guide groove 310, and is used for, when the first guide groove 310 rotates, to translate relative to the inner cylinder 400 along the extension direction of the second guide groove 410, so as to drive the lens module 100 to telescope relative to the inner cylinder 400.

[0045] Preferably, the lens module 100 includes a lens barrel 120 and a base 110, and the base 110 is fixed to the bottom of the lens barrel 120; the rotating column 111 is provided on one end of the base 110 close to the lens barrel 120, and passes through the second guide groove 410 and the first guide groove 310 in sequence; the base 110 is used to drive the lens barrel 120 to translate under the movement of the rotating column 111, and the base 110 is used to translate forward relative to the inner cylinder 400 when the first guide groove 310 performs a circling motion, and translate backward relative to the inner cylinder 400 when the first guide groove 310 performs a rotary motion.

[0046] Preferably, the motor module 200 includes: a motor 210 for driving the output gear 241 to rotate; and a main board 220 electrically connected to the motor 210 for controlling the motor 210 to rotate forward and reverse.

[0047] The lifting principle of the telescopic lens assembly 10 is explained in conjunction with the usage process.

[0048] First, the user can remotely control or press a button to activate the mainboard 220. For example, a start button can be provided on the optical machine 1, and the user can press the start button to activate the mainboard 220. Alternatively, a communication module can be provided on the mainboard 220, and the user can remotely activate the mainboard 220 using a mobile phone or remote control. Furthermore, the user can also control the height of the lens barrel 120 through the mainboard 220.

[0049] Under the user's operation, the main board 220 starts working and controls the motor 210 to rotate. For example, if the user needs to raise the lens barrel 120 to a certain height, the main board 220 issues a command to control the motor 210 to rotate forward a certain number of times. If the user needs to lower the lens barrel 120 to a certain height, the main board 220 issues a command to control the motor 210 to rotate reverse a certain number of times.

[0050] Among them, the motor 210 can drive the output gear 241 to rotate counterclockwise when rotating forward, and drive the output gear 241 to rotate clockwise when rotating reversely; it can also drive the output gear 241 to rotate clockwise when rotating forward, and drive the output gear 241 to rotate counterclockwise when rotating forward.

[0051] Combine Figure 4 and Figure 5 The ascending process of the lens barrel 120 is described as follows: when the output gear 241 rotates counterclockwise, the toothed disc 320 meshing with the output gear 241 rotates as follows: Figure 5 In the clockwise rotation of the toothed disc 320, the first guide groove 310 on the outer cylinder 300 is rotated along the Figure 5 When the first guide groove 310 performs a spiral motion, the rotating column 111 is subjected to the sliding friction force of the edge of the first guide groove 310, and the following occurs: Figure 5 However, since the rotating column 111 passes through the second guide groove 410, the movement direction of the rotating column 111 is limited by the second guide groove 410, as shown in FIG. Figure 4 As shown, the rotating column 111 only moves along the extension direction of the second guide groove 410. Therefore, the extension direction of the second guide groove 410 can be set to be consistent with the lifting direction of the lens barrel 120, so that when the rotating column 111 is subjected to the friction force in the circling direction, it can only move in a straight line consistent with the lifting direction, thereby achieving a smooth rise of the lens barrel 120.

[0052] Regarding the descending process of the lens barrel 120: under the clockwise rotation of the output gear 241, the toothed disc 320 engaged with the output gear 241 rotates counterclockwise; under the counterclockwise rotation of the toothed disc 320, the first guide groove 310 on the outer cylinder 300 performs a rotary motion opposite to the circular motion; when the first guide groove 310 performs the rotary motion, the rotating column 111 is subjected to the sliding friction force of the edge of the first guide groove 310, and moves horizontally along the extension direction of the second guide groove 410, thereby achieving a smooth descent of the lens barrel 120.

[0053] Furthermore, when the rotating column 111 slips due to the sliding friction force generated by the movement of the first guide groove 310 , the first guide groove 410 limits the rotating column 111 , so that the mainboard 220 can accurately and effectively control the lifting distance of the lens barrel 120 .

[0054] A gear disc 320 is provided on the outer side of the bottom of the outer cylinder 300 , and the output gear 241 of the motor module 200 is meshed with the gear disc 320 . The center distance of the output gear 241 is smaller than the center distance of the gear disc 320 .

[0055] Providing the gear wheel 320 at the outer side of the bottom of the outer cylinder 300 can fully utilize the center distance of the gear wheel 320, that is, the transmission ratio can be fully reduced by the center distance of the gear wheel 320, and the transmission speed transmitted from the output gear 241 can be reduced, so that the lifting and lowering of the lens barrel 120 is smoother.

[0056] Furthermore, the motor module 200 further includes: a motor housing 230, the motor 210 and the main board 220 are arranged at the bottom of the motor housing 230; a central gear 242, which is arranged in the motor housing 230 and is connected to the output shaft of the motor 210, and is used to rotate under the drive of the motor 210; a driven gear set, which is arranged in the motor housing 230, and the driven gear set includes an input driven gear 243 and an output driven gear 244, and the input driven gear 243 is meshed with the central gear 242, and is used to rotate at the central gear 242. The gear 242 rotates and drives the output driven gear 244 to rotate; the support column 245, the support column 245 passes through the top of the motor housing 230, one end extends into the motor housing 230 and is fixed to the output driven gear 244, and the other end extends to the outside of the motor housing 230 and is fixed to the output gear 241, and is used to drive the output gear 241 to rotate under the rotation of the output driven gear 244, so as to reduce the transmission speed of the motor through the driven gear set, so that the rotation speed of the output gear 241 is stable.

[0057] Preferably, a plurality of ventilation holes 246 are provided at the bottom of the motor housing 230 to dissipate heat from components inside the motor housing 230 and improve the operating efficiency of the motor 210 and the mainboard 220 .

[0058] Preferably, at least three rotating columns 111 are provided on the base 110, and the at least three rotating columns 111 are arranged in a centrally symmetrical manner. The inner cylinder 400 is provided with a plurality of second guide grooves 410 adapted to the at least three rotating columns 111, and the inner cylinder 400 is provided with a plurality of first guide grooves 310 corresponding to the at least three rotating columns 111. Each rotating column 111 sequentially passes through the second guide groove 410 and the first guide groove 310 corresponding to the rotating column 111, thereby improving the stability of the lens barrel 120 during the lifting process.

[0059] Preferably, the telescopic lens assembly 10 also includes a base plate 500; the outer cylinder 300 can be rotatably fixed to the base plate 500, and the inner cylinder 400 is fixed to the base plate 500; the lens module 100 passes through the base plate 500 and is sleeved on the inner cylinder 400, and is used to rise and fall relative to the base plate 500 when the first guide groove 310 rotates; the motor housing 230, the top of the motor housing 230 is provided with a fixing portion 231, the motor housing 230 passes through the base plate 500 from the side of the base plate 500 away from the outer cylinder 300, the fixing portion 231 is fixed to the side of the base plate 500 close to the outer cylinder 300, and the output gear 241 and the gear wheel 320 are located on the same horizontal plane.

[0060] Preferably, the telescopic lens assembly 10 also includes an outer shell 600, which includes: an annular portion 610, which is fitted and fixed to the base plate 500 and is arranged around the outer side of the bottom of the outer cylinder 300, for closing the toothed disc 320; a shell portion 620, which is connected to the annular portion 610, and the output gear 241 and the support column 245 are enclosed inside the shell portion 620 to prevent dust, hair debris, etc. from entering the toothed disc 320 and the output gear 241, thereby hindering the movement of the toothed disc 320 and the output gear 241.

[0061] The embodiment of the present application arranges the lens module 100 in the inner cylinder 400, so that when the lens module 100 is extended or retracted relative to the inner cylinder 400, the inner cylinder 400 does not move, thereby limiting the displacement of the lens module 100 by the inner cylinder 400, thereby improving the stability of the lens module 100 during the lifting and lowering process; by passing the rotating column 111 through the second guide groove 410 and being inserted into the first guide groove 310, when the first guide groove 310 rotates, the rotating column 111 translates relative to the inner cylinder 400 along the extension direction of the second guide groove 410, thereby driving the lens module 100 to extend or retract relative to the inner cylinder 400, so that the rotating column 111 can only move along the second guide groove 410, and when the rotating column 111 is subjected to the force of the first guide groove 310 and slips relative to the first guide groove 310, it will be difficult for it to deviate due to the limit of the second guide groove 410, thereby ensuring that the lens module 100 is lifted and lowered smoothly.

[0062] According to another aspect of the embodiments of the present application, an optical machine is further provided, which includes the telescopic lens assembly 10 as described in any of the above embodiments.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A telescopic lens assembly, characterized in that: The telescopic lens assembly comprises: The outer cylinder has a side wall provided with a first guide groove, wherein the first guide groove is spiral-shaped; The inner cylinder is sleeved in the outer cylinder, and a second guide groove is formed on the side wall of the inner cylinder, wherein the second guide groove is in a straight line shape; a motor module connected to the outer cylinder and configured to drive the first guide groove to rotate; A lens module is sleeved in the inner cylinder, and a rotating column is provided on the lens module; The rotating column passes through the second guide groove and is inserted into the first guide groove, and is used to translate relative to the inner cylinder along the extension direction of the second guide groove when the first guide groove rotates, so as to drive the lens module to expand and contract relative to the inner cylinder.

2. The telescopic lens assembly according to claim 1, wherein: The lens module includes a lens barrel and a base, and the base is fixed to the bottom of the lens barrel; The rotating column is provided on one end of the base close to the lens barrel and passes through the second guide groove and the first guide groove in sequence; The base is used to drive the lens barrel to translate under the movement of the rotating column, and the base is used to translate forward relative to the inner cylinder when the first guide groove performs a circular motion, and translate backward relative to the inner cylinder when the first guide groove performs a rotary motion.

3. The telescopic lens assembly according to claim 2, wherein: At least three rotating columns are provided on the base, and the at least three rotating columns are arranged in a centrally symmetrical manner. The inner cylinder is provided with a plurality of second guide grooves adapted to the at least three rotating columns, and the inner cylinder is provided with a plurality of first guide grooves corresponding to the at least three rotating columns, and each rotating column sequentially passes through the second guide groove and the first guide groove corresponding to the rotating column.

4. The telescopic lens assembly according to claim 1, wherein: A gear disc is provided on the outer side of the bottom of the outer cylinder, and the output gear of the motor module is engaged with the gear disc, and the center distance of the output gear is smaller than the center distance of the gear disc.

5. The telescopic lens assembly according to claim 4, wherein: The motor module includes: a motor, configured to drive the output gear to rotate; The main board is electrically connected to the motor and is used to control the motor to rotate forward and reverse.

6. The telescopic lens assembly according to claim 5, wherein: The motor module further includes: A motor housing, wherein the motor and the mainboard are arranged at the bottom inner portion of the motor housing; a central gear disposed in the motor housing and connected to the output shaft of the motor, and configured to rotate under the drive of the motor; a driven gear set disposed in the motor housing, the driven gear set comprising an input driven gear and an output driven gear, the input driven gear meshing with the central gear and configured to rotate under the drive of the central gear and drive the output driven gear to rotate; A support column, wherein the support column passes through the top of the motor housing, one end of the support column extends into the motor housing and is fixed to the output driven gear, and the other end extends to the outside of the motor housing and is fixed to the output gear, and is used to drive the output gear to rotate when the output driven gear rotates.

7. The telescopic lens assembly according to claim 6, wherein: A plurality of ventilation holes are provided at the bottom of the motor housing.

8. The telescopic lens assembly according to claim 6, wherein: The telescopic lens assembly also includes a base plate; The outer cylinder is rotatably fixed to the bottom plate, and the inner cylinder is fixed to the bottom plate; The lens module passes through the bottom plate and is sleeved on the inner cylinder, and is used to be lifted and lowered relative to the bottom plate when the first guide groove rotates; The motor housing has a fixing portion on the top, the motor housing passes through the bottom plate from the side of the bottom plate away from the outer cylinder, the fixing portion is fixed to the side of the bottom plate close to the outer cylinder, and the output gear and the gear disc are located on the same horizontal plane.

9. The telescopic lens assembly according to claim 8, wherein: The telescopic lens assembly also includes an outer shell, which includes: an annular portion, which is fixed to the base plate and is arranged around the outside of the bottom of the outer cylinder to close the gear disk; a shell portion, which is connected to the annular portion, and the output gear and the support column are enclosed inside the shell portion.

10. An optical machine, characterized in that: It comprises the telescopic lens assembly as described in any one of claims 1 to 9.

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