CN220137468U - Lens barrel module and electronic device - Google Patents

Abstract

The utility model provides a lens barrel module and an electronic device, which can realize thinning without greatly reducing reliability. The lens barrel module (2) has: a fixed cylinder (30) having a cam groove (33) formed on the inner peripheral surface thereof, the cam groove including a spiral groove (33A) extending in a spiral shape; a rotary cylinder (40) disposed radially inward of the fixed cylinder (30); and a shroud (60) formed of a harder material than the stationary barrel (30). The rotary cylinder (40) has 1 lens (42) and a protruding portion (45) protruding radially outward and engaging with the cam groove (33) of the fixed cylinder (30). The shroud (60) has: a coating part (601) which covers the outer peripheral surface of the front end part (301) of the fixed cylinder (30); and a circular ring part (602) extending from the coating part (601) to a position radially inward of the inner periphery of the front end part (301) of the fixed cylinder (30).

Description

Lens barrel module and electronic device

Technical Field

The present utility model relates to a lens barrel module and an electronic device, and more particularly, to a lens barrel module capable of extending a lens barrel forward in an optical axis direction.

Background

A camera incorporated in a small electronic device such as a smart phone must be housed in a limited space, and therefore, there are often provided a mechanism for housing a lens barrel in a main body except for the time of photographing and for extending the lens barrel at the time of photographing (for example, refer to patent document 1). Such an extension mechanism includes: a rotary drum having pins protruding radially outward; and a fixed cylinder formed with a spiral cam groove for engagement of the pin, the pin of the rotating cylinder moving along the cam groove of the fixed cylinder when the rotating cylinder rotates relative to the fixed cylinder, whereby the rotating cylinder protrudes.

Here, if the axial distance from the front edge of the fixed cylinder to the front end portion of the cam groove is too short, the strength of the fixed cylinder cannot be sufficiently ensured, and therefore, it is considered that the fixed cylinder is broken when a force is applied to the pin of the rotary cylinder that moves to the front end portion of the cam groove. Therefore, in the conventional extension mechanism, in order to secure the strength of the fixed cylinder, it is necessary to extend the axial distance from the front edge of the fixed cylinder to the front end portion of the cam groove to some extent. As a result, the axial length of the fixed cylinder cannot be sufficiently shortened, which is one factor that hinders the thinning of the lens barrel module.

Patent document 1: japanese patent No. 5328249 specification

Disclosure of Invention

The present utility model has been made in view of the above-described problems of the related art, and an object of the present utility model is to provide a lens barrel module and an electronic device that can be thinned without significantly reducing the reliability.

A first aspect of the present utility model provides a lens barrel module, including: a fixed cylinder having a cam groove formed on an inner peripheral surface thereof, the cam groove including a spiral groove extending in a spiral shape; a rotary cylinder disposed radially inward of the fixed cylinder, the rotary cylinder having at least 1 lens and a projection projecting radially outward, the projection being engaged with the cam groove of the fixed cylinder; and a cover ring formed of a material harder than the fixed cylinder, the cover ring having a coating portion that covers an outer peripheral surface of a distal end portion of the fixed cylinder, and a circular ring portion that extends from the coating portion to a position radially inward of an inner peripheral edge of the distal end portion of the fixed cylinder.

In the lens barrel module according to a second aspect of the present utility model, in the first aspect, the cam groove of the fixed cylinder further includes a tip groove extending in a circumferential direction from a tip of the spiral groove, and the coating portion of the cover ring is configured to cover at least a part of an outer peripheral surface of the tip groove of the cam groove of the fixed cylinder, the outer peripheral surface being located outside.

A lens barrel module according to a third aspect of the present utility model is the lens barrel module according to the first or second aspect, further comprising an auxiliary ring closing a gap between the annular portion of the cover ring and an outer peripheral surface of the rotary cylinder, wherein the auxiliary ring is fixed by being sandwiched between the fixing cylinder and the annular portion of the cover ring.

A lens barrel module according to a fourth aspect of the present utility model is the lens barrel module according to the third aspect, wherein the auxiliary ring includes: a first piece having an inner diameter smaller than an outer diameter of the rotary cylinder, the first piece being formed with a plurality of slits radially extending from a radially inner side; and a second sheet disposed on the first sheet and having an inner diameter larger than an inner diameter of the first sheet.

A fifth aspect of the present utility model provides an electronic device, comprising: the lens barrel module according to any one of the first to fourth aspects; and an image pickup element disposed on an optical axis of the at least 1 lens of the lens barrel module.

Drawings

Fig. 1 is a perspective view illustrating a smart phone incorporating a lens barrel module in one embodiment of the present utility model.

Fig. 2 is a schematic diagram illustrating a functional structure of the smart phone shown in fig. 1.

Fig. 3 is a perspective view illustrating the lens barrel module shown in fig. 1.

Fig. 4 is an exploded perspective view of the lens barrel module shown in fig. 3.

Fig. 5 is a perspective view illustrating a fixed barrel in the lens barrel module shown in fig. 3.

Fig. 6 is an exploded perspective view of a driving unit in the lens barrel module shown in fig. 3.

Fig. 7 is a front view of the driving unit in a state in which the cover shown in fig. 6 is removed.

Fig. 8 is a left side view schematically illustrating the lens barrel module shown in fig. 1 in a contracted state.

Fig. 9 is a left side view schematically showing the lens barrel module shown in fig. 8 in an extended state.

Fig. 10 is a longitudinal sectional view of the lens barrel module in the state of fig. 9.

Fig. 11 is an exploded perspective view of an auxiliary ring in the lens barrel module shown in fig. 4.

Description of the reference numerals

1: a smart phone; 2: a lens barrel module; 3: a camera; 4: a control unit; 5: an acceleration sensor; 6: an image pickup element; 10: a base plate; 11. 32: a photointerrupter; 20: a driving unit; 21: a motor; 24: a drive gear; 25: a rotation transmission mechanism; 30: a fixed cylinder; 31: a cylindrical portion; 33: cam grooves; 33A: a spiral groove; 33B: a rear end slot; 33C: a front end groove; 40: a rotary drum; 41: a cylindrical portion; 42: a lens; 45: a protruding portion; 46: a driven gear; 50: a direct-acting cylinder; 60: a cover ring; 62: an auxiliary ring; 63: a first sheet; 64: a second sheet; 250: a worm; 251: a double-stage gear; 252-254: a gear; 255: a coil spring; 256: a gasket; 301: a front end portion; 301A: an inner periphery; 302: a concave portion; 601: a coating section; 602: a circular ring part.

Detailed Description

Hereinafter, an embodiment of an electronic apparatus having a lens barrel module according to the present utility model will be described in detail with reference to fig. 1 to 11. In fig. 1 to 11, the same or corresponding components are denoted by the same reference numerals, and overlapping description thereof is omitted. In fig. 1 to 11, the scale and the dimensions of each component are exaggerated, and some components are omitted. In the following description, unless otherwise specified, terms such as "first" and "second" are used merely to distinguish components from each other, and do not denote a particular order or sequence.

Fig. 1 is a perspective view showing a smartphone 1 as an example of an electronic device of the present utility model, and a camera 3 including a lens barrel module 2 of the present utility model is incorporated in the smartphone 1. As shown in fig. 1, the smart phone 1 includes a control unit 4 for controlling electrical components in the smart phone 1, and an acceleration sensor 5 capable of detecting acceleration of the smart phone 1. The camera 3 and the acceleration sensor 5 are connected to the control unit 4, respectively. The electronic device of the present utility model is not limited to the smart phone described in the present embodiment, and the present utility model can be applied to various electronic devices such as a tablet pc, a laptop computer, and an unmanned aerial vehicle.

Fig. 2 is a schematic diagram showing a functional structure of the smartphone 1 shown in fig. 1. As shown in fig. 2, the smartphone 1 has: a camera 3 including a lens barrel module 2 and an image pickup element 6; an acceleration sensor 5 capable of detecting acceleration of the smartphone 1; a display 7 composed of a liquid crystal display, an organic EL display, or the like; a storage unit 8 including ROM, RAM, flash memory, and the like; a communication unit 9 for performing data communication by connecting to a network; and a control unit 4 for controlling the operations of the respective constituent elements.

The storage unit 8 stores programs for controlling an OS (Operating System), the smartphone 1, programs for executing steps described below, other various data, and the like. The control section 4 has a processor (CPU), ROM, RAM, and the like, and realizes various functions by loading a program stored in the storage section 8 into the RAM and executing the program with the processor.

Fig. 3 is a perspective view showing the lens barrel module 2, and fig. 4 is an exploded perspective view. As shown in fig. 3 and 4, the lens barrel module 2 has: an annular base plate 10; a drive unit 20 having a motor 21; a fixing cylinder 30 fixed to the base plate 10 by screws (not shown); a rotary drum 40 disposed radially inward of the fixed drum 30; a linear cylinder 50 housed inside the rotary cylinder 40; a shroud 60 attached to the front edge of the cylindrical portion 31; and an auxiliary ring 62 sandwiched between the cover ring 60 and the cylindrical portion 31. In the present embodiment, the +z direction in fig. 3 is referred to as "front" or "front", and the-Z direction is referred to as "rear" or "rear", for convenience.

Fig. 5 is a perspective view showing the fixed cylinder 30. As shown in fig. 3 to 5, the fixed tube 30 is formed of, for example, resin or the like, and includes a cylindrical portion 31 and a photointerrupter 32 attached to the outer peripheral portion of the cylindrical portion 31. The photointerrupter 32 can transmit a detection signal to the control unit 4, and the photointerrupter 32 faces the inner space of the cylindrical portion 31 through the opening 38 formed in the cylindrical portion 31. A plurality of cam grooves 33 and axial grooves 34, 35 extending in the axial direction (Z direction) from the rear edge of the cylindrical portion 31 are formed in the inner peripheral surface of the cylindrical portion 31. Each cam groove 33 includes a spiral groove 33A extending in a spiral shape, a rear end groove 33B extending in the circumferential direction from the rear end of the spiral groove 33A, and a front end groove 33C extending in the circumferential direction from the front end of the spiral groove 33A. Further, the cylindrical portion 31 is formed with a notch 39 at a connection portion with the drive unit 20. In the present specification, "spirally extend" means extending so that the circumferential position changes in the axial direction.

As shown in fig. 4, the base plate 10 has a photointerrupter 11 attached to the outer peripheral portion and an insertion piece 12 inserted into an axial groove 35 of the inner peripheral surface of the cylindrical portion 31 of the fixed tube 30. The photointerrupter 11 of the base plate 10 is located on the-Z direction side of the photointerrupter 32 of the fixed cylinder 30, and the photointerrupter 11 faces the inner space of the cylindrical portion 31 through the opening 38 similarly to the photointerrupter 32. The photointerrupter 11 can transmit the detection signal to the control unit 4 in the same manner as the photointerrupter 32.

The rotary cylinder 40 is rotatable relative to the fixed cylinder 30 and is movable in the axial direction. As shown in fig. 4, the rotary drum 40 includes a cylindrical portion 41, at least 1 lens 42 accommodated in the cylindrical portion 41, a cover glass 43 disposed in front of the lens 42, and a ring member 44 attached to the front end portion of the cylindrical portion 41. As shown in fig. 1, the rotary drum 40 is disposed so as to be exposed from an opening 1B formed in the rear panel 1A of the smartphone 1. The image pickup device 6 of the camera 3 of the smartphone 1 is disposed on an image pickup surface on which the light transmitted through the lens 42 is imaged.

The rotary cylinder 40 includes a plurality of protruding portions 45 protruding radially outward from the rear end outer peripheral portion of the cylindrical portion 41, and a driven gear 46 formed circumferentially on the rear end outer peripheral portion of the cylindrical portion 41. The outer diameter of each protruding portion 45 is slightly smaller than the width of the cam groove 33 of the fixed cylinder 30 in the circumferential direction (hereinafter referred to as circumferential width), and each protruding portion 45 is engageable with the cam groove 33 of the fixed cylinder 30 and movable along the cam groove 33 inside the cam groove 33. By the engagement of the protruding portion 45 of the rotary cylinder 40 with the spiral groove 33A of the cam groove 33 of the fixed cylinder 30, when the rotary cylinder 40 rotates relative to the fixed cylinder 30, the rotary cylinder 40 moves in the Z direction relative to the fixed cylinder 30 along the shape of the cam groove 33 of the fixed cylinder 30.

The linear motion cylinder 50 includes a cylindrical portion 51, a plurality of protrusions 52 protruding radially outward from the cylindrical portion 51, a flange portion 53 extending radially outward from a rear end of the cylindrical portion 51, a plurality of engagement portions 54 extending radially outward from the flange portion 53, and a detection piece 55 similarly extending radially outward from the flange portion 53. Each of the protrusions 52 of the linear cylinder 50 engages with a groove (not shown) formed on the inner peripheral surface of the cylindrical portion 41 of the rotary cylinder 40 and extending in the circumferential direction. The circumferential width of each engagement portion 54 of the linear motion cylinder 50 is slightly smaller than the circumferential width of the axial groove 34 of the fixed cylinder 30, and each engagement portion 54 is engageable with the axial groove 34 of the fixed cylinder 30 and movable in the Z direction along the axial groove 34 inside the axial groove 34. With this configuration, the linear cylinder 50 is not rotated with respect to the fixed cylinder 30, and can move in the axial direction together with the rotary cylinder 40 while rotating with respect to the rotary cylinder 40.

The detection piece 55 of the linear motion tube 50 extends outward through the opening 38 of the fixed tube 30, and the photointerrupter 11 of the base plate 10 adjacent to the opening 38 and the photointerrupter 32 of the fixed tube 30 can detect the detection piece 55 of the linear motion tube 50.

Fig. 6 is an exploded perspective view of the driving unit 20. As shown in fig. 6, the drive unit 20 includes a motor 21 driven by the control unit 4, a gear housing 22 attached to the base plate 10, a gear cover 23 attached to the gear housing 22 by screws 91, a drive gear 24 engaged with a driven gear 46 of the rotary drum 40, and a rotation transmission mechanism 25 capable of transmitting rotation of the motor 21 to the drive gear 24.

Fig. 7 is a front view of the drive unit 20 with the gear cover 23 removed. As shown in fig. 6 and 7, the rotation transmission mechanism 25 includes: a worm 250 mounted to an output shaft of the motor 21; a two-stage gear 251 including a worm wheel 251A meshed with the worm 250 and a gear 251B disposed on the-Z direction side of the worm wheel 251A; a gear 252 which meshes with a gear 251B of the double stage gear 251; a gear 253 disposed coaxially with the gear 252; a gear 254 that meshes with both the gear 253 and the drive gear 24; a coil spring 255 as a biasing member, which is housed in a central portion of the gear 252; and a washer 256 disposed between the coil spring 255 and the main body 253A of the gear 253.

The double stage gear 251 is attached to a gear shaft 221 extending in the +z direction from the gear housing 22, and is rotatable about the gear shaft 221. The gear 252 is attached to a gear shaft 222 extending in the +z direction from the gear housing 22, and is rotatable about the gear shaft 222. The shaft portion 253B of the gear 253 is also attached to the gear shaft 222, and the gear 253 can rotate around the gear shaft 222. The gear 254 is attached to a gear shaft 223 protruding in the +z direction from the gear housing 22, and is rotatable about the gear shaft 223. The drive gear 24 is attached to a gear shaft 224 extending in the +z direction from the gear housing 22, and is rotatable about the gear shaft 224.

The coil spring 255 of the rotation transmission mechanism 25 is housed in a compressed state in the center portion of the gear 252, and biases the washer 256 toward the main body 253A of the gear 253 with a predetermined force. One end of the coil spring 255 is engaged with a groove 252A formed in the center of the gear 252, and the coil spring 255 rotates together with the gear 252. The washer 256 biased by the coil spring 255 also rotates together with the gear 252, and when the gear 252 rotates, the gear 253 rotates together with the gear 252 by friction force generated between the washer 256 and the main body 253A of the gear 253. On the other hand, when a torque exceeding the friction force acts on the washer 256, the washer 256 and the main body 253A of the gear 253 slide to idle, and transmission of rotation between the gear 252 and the gear 253 is cut off. As described above, in the present embodiment, the gear 252, the coil spring 255, the washer 256, and the gear 253 function as a torque limiter that cuts off transmission of rotation between the gear 252 and the gear 253 when a predetermined torque is applied.

When the camera function of the smartphone 1 is turned off, as shown in fig. 3, the rotation tube 40 is housed inside the fixed tube 30 of the lens barrel module 2 in the radial direction, and the rotation tube 40 is housed inside the rear panel 1A of the smartphone 1. The state of the lens barrel module 2 at this time is referred to as a "collapsed state".

Fig. 8 is a left side view schematically showing the lens barrel module 2 at this time. As shown in fig. 8, in the contracted state, the protruding portion 45 of the rotary cylinder 40 is located in the rear end groove 33B of the cam groove 33 of the fixed cylinder 30. When the photointerrupter 11 attached to the base plate 10 detects the detection piece 55 of the linear motion tube 50, a detection signal is transmitted to the control unit 4, and the control unit 4 can detect that the rotary tube 40 is housed inside the fixed tube 30.

When the user provides an instruction to turn on the camera function to the control section 4 using an input unit such as a touch panel on the display 7 of the smartphone 1, the control section 4 transmits a control signal to the motor 21 of the drive unit 20 of the lens barrel module 2, causing the motor 21 to rotate. The rotation of the motor 21 is transmitted to the drive gear 24 by the rotation transmission mechanism 25, and the drive gear 24 is rotated. Since the driven gear 46 of the rotary drum 40 is engaged with the driving gear 24, the rotary drum 40 rotates with the rotation of the driving gear 24. When the rotary drum 40 rotates, as described above, the rotary drum 40 moves in the Z direction with respect to the fixed drum 30 along the shape of the cam groove 33 of the fixed drum 30 by the engagement of the protruding portion 45 of the rotary drum 40 with the cam groove 33 of the fixed drum 30, and finally, as shown in fig. 9, the protruding portion 45 of the rotary drum 40 moves to the front end groove 33C of the cam groove 33 of the fixed drum 30. In this way, the motor 21 of the lens barrel module 2 is driven by the control unit 4, and the rotary drum 40 is extended in the +z direction. When the photointerrupter 32 attached to the fixed cylinder 30 detects the detection piece 55 of the linear motion cylinder 50, a detection signal is sent to the control unit 4, and the control unit 4 detects that the rotary cylinder 40 is extended, and turns on the camera function. Thus, when the rotary cylinder 40 is extended, the extended rotary cylinder 40 protrudes from the rear panel 1A (see fig. 1) of the smartphone 1. The state of the lens barrel module 2 at this time is referred to as an "extended state".

Fig. 10 is a longitudinal sectional view of the lens barrel module 2 in the state of fig. 9. As shown in fig. 10, a cover ring 60 made of a harder material than the fixed cylinder 30, for example, metal, is attached to the front end 301 of the cylindrical portion 31 of the fixed cylinder 30. The cover ring 60 has a coating portion 601 covering the outer peripheral surface of the front end 301 of the fixed cylinder 30, and a circular ring portion 602 extending radially inward from the front end of the coating portion 601. The annular portion 602 of the cover ring 60 extends to a position radially inward of the inner peripheral edge 301A of the front end 301 of the fixed cylinder 30, and the cover ring 60 covers the radially outer side of the front end 301 of the fixed cylinder 30 by the coating portion 601, and covers the front of the front end 301 of the fixed cylinder 30 by the annular portion 602.

As shown in fig. 5, the outer diameter of the front end 301 of the cylindrical portion 31 of the fixed cylinder 30 is smaller than the outer diameter of the cylindrical portion 31 located rearward of the front end 301. The outer diameter of the distal end 301 is slightly larger than the inner diameter of the coating portion 601 of the cover ring 60 before mounting, and the cover ring 60 is fixed to the fixed cylinder 30 by pressing the coating portion 601 into the distal end 301 of the fixed cylinder 30. The cover ring 60 may be pressed into the fixed cylinder 30 after the adhesive material is applied between the cover ring 60 and the distal end 301 of the fixed cylinder 30.

As shown in fig. 5, a recess 302 recessed inward in the radial direction is formed in the distal end 301 of the fixed cylinder 30. As shown in fig. 10, an auxiliary ring 62 for suppressing dust or water from entering the inside of the fixed cylinder 30 is disposed in the recess 302. The auxiliary ring 62 is fixed by being sandwiched between the front end 301 of the fixed cylinder 30 and the annular portion 602 of the cover ring 60 in the recess 302. In this way, the auxiliary ring 62 is fixed by being sandwiched between the distal end 301 of the fixing tube 30 and the annular portion 602 of the cover ring 60, and therefore, no adhesive material, double-sided tape, or the like is required for fixing.

The auxiliary ring 62 in the present embodiment has a structure in which 2 annular sheets 63 and 64 are stacked. Fig. 11 is an exploded perspective view of the auxiliary ring 62. The first sheet 63 is made of a soft material such as rubber, for example, and the inner diameter D of the first sheet 63 ₁ Smaller than the outer diameter of the cylindrical portion 41 of the rotary cylinder 40. A plurality of slits 65 extending radially from the radially inner side are formed in the first piece 63. The second sheet 64 is formed of a harder material than the first sheet 63, such as polyethylene terephthalate. The inner diameter D of the second sheet 64 ₂ Greater than the inner diameter D of the first sheet 63 ₁ . The outer diameter of the first piece 63 is substantially the same as the outer diameter of the second piece 64. The auxiliary ring 62 is formed by overlapping the sheets 63 and 64.

As described above, the inner diameter D of the first sheet 63 ₁ The outer diameter of the cylindrical portion 41 of the rotary drum 40 is smaller than that of the rotary drum 40, but since the slit 65 is formed radially inward, the first piece 63 can be deformed flexibly radially inward. Therefore, as shown in fig. 10, the first piece 63 can be deformed radially inward to close the gap between the annular portion 602 of the shroud 60 and the outer peripheral surface of the cylindrical portion 41 of the rotary drum 40. In this way, since the gap between the annular portion 602 of the cover ring 60 and the outer peripheral surface of the cylindrical portion 41 of the rotary cylinder 40 is closed by the auxiliary ring 62, dust or water can be suppressed from entering the inside of the fixed cylinder 30 from the outside of the fixed cylinder 30. Further, since the thickness of the auxiliary ring 62 on the outer side in the radial direction is made thicker by the first piece 63 and the second piece 64, the auxiliary ring 62 can be firmly sandwiched between the fixed cylinder 30 and the annular portion 602 of the cover ring 60.

As described above, in the present embodiment, the outer side and the front side of the front end 301 of the fixed cylinder 30 are covered with the covering portion 601 and the annular portion 602 of the cover ring 60 formed of a material (for example, metal) harder than the fixed cylinder 30, and therefore the front end 301 of the fixed cylinder 30 is reinforced by the cover ring 60. Therefore, even if the axial distance from the front edge of the fixed cylinder 30 to the front end groove 33C of the cam groove 33 is shortened, the front end 301 of the fixed cylinder 30 is not easily broken, and therefore the axial length of the fixed cylinder 30 can be shortened without greatly reducing the reliability.

In addition, when the rotary cylinder 40 is extended from the fixed cylinder 30, as shown in fig. 10, the protruding portion 45 of the rotary cylinder 40 is located in the front end groove 33C of the cam groove 33 of the fixed cylinder 30, and therefore, the force from the protruding portion 45 of the rotary cylinder 40 is liable to act on the front end groove 33C of the cam groove 33 of the fixed cylinder 30. Therefore, as shown in fig. 10, it is preferable that at least a part of the outer peripheral surface of the outer side of the front end groove 33C is covered and reinforced with the covering portion 601 of the cover ring 60, so that breakage of the fixed cylinder 30 at the front end groove 33C of the cam groove 33 of the fixed cylinder 30 is suppressed.

As described above, according to the first aspect of the present utility model, a lens barrel module capable of realizing thinning without greatly reducing reliability is provided. The lens barrel module includes: a fixed cylinder having a cam groove formed on an inner peripheral surface thereof, the cam groove including a spiral groove extending in a spiral shape; a rotary drum disposed radially inward of the fixed drum; and a cover ring formed of a material harder than the fixed cylinder. The rotary cylinder has at least 1 lens and a protruding portion protruding radially outward, and the protruding portion engages with the cam groove of the fixed cylinder. The shroud ring includes: a coating part which covers the outer peripheral surface of the front end part of the fixed cylinder; and a ring portion extending from the coating portion to a position radially inward of an inner peripheral edge of the distal end portion of the fixed cylinder.

According to this structure, the outer side and the front of the front end portion of the fixed cylinder are covered with the covering portion and the annular portion of the cover ring formed of a harder material than the fixed cylinder, and therefore the front end portion of the fixed cylinder is reinforced by the cover ring. Therefore, even if the axial distance from the front edge of the fixed cylinder to the front end portion of the cam groove is shortened, the front end portion of the fixed cylinder is not easily broken, and therefore the axial length of the fixed cylinder can be shortened without greatly reducing the reliability.

The cam groove of the fixed cylinder may further include a tip groove extending in a circumferential direction from a tip of the spiral groove. Preferably, the coating portion of the cover ring is configured to cover at least a part of an outer peripheral surface of the front end groove of the cam groove of the fixed cylinder, the outer peripheral surface being located outside. When the rotary cylinder is extended from the fixed cylinder, since the protruding portion of the rotary cylinder is located in the front end groove of the cam groove of the fixed cylinder, the force from the protruding portion of the rotary cylinder easily acts on the front end groove of the cam groove of the fixed cylinder. Therefore, by covering and reinforcing at least a part of the outer peripheral surface of the outer side of the front end groove with the covering portion of the cover ring, breakage of the fixed cylinder at the front end groove of the cam groove can be suppressed.

Preferably, the lens barrel module further includes an auxiliary ring closing a gap between the annular portion of the cover ring and an outer peripheral surface of the rotary cylinder. Preferably, the auxiliary ring is sandwiched between the fixing cylinder and the annular portion of the cover ring and fixed. The auxiliary ring closes the gap between the annular portion of the cover ring and the outer peripheral surface of the rotary cylinder, so that dust or water can be prevented from entering the inside of the fixed cylinder from the outside of the fixed cylinder. In addition, if the auxiliary ring is fixed by being sandwiched between the fixing tube and the annular portion of the cover ring, the auxiliary ring can be fixed to the fixing tube without using an adhesive material, a double-sided tape, or the like.

The auxiliary ring may include: a first piece having an inner diameter smaller than an outer diameter of the rotary cylinder, the first piece being formed with a plurality of slits radially extending from an inner side in a radial direction; and a second sheet disposed on the first sheet and having an inner diameter larger than the inner diameter of the first sheet. According to this structure, since the slit is formed on the inner side in the radial direction of the first sheet, the first sheet can be deformed flexibly on the inner side in the radial direction. Therefore, the first piece can be deformed radially inward to effectively close the gap between the annular portion of the shroud and the outer peripheral surface of the rotary drum. Further, since the thickness of the auxiliary ring on the outer side in the radial direction is made larger than the thickness of the first piece and the second piece, the auxiliary ring can be firmly sandwiched between the fixed cylinder and the annular portion of the cover ring.

According to another aspect of the present utility model, there is provided an electronic device capable of achieving thinning without greatly reducing reliability. The electronic apparatus has the above-described lens barrel module and an image pickup element disposed on an optical axis of the above-described at least 1 lens of the above-described lens barrel module.

The preferred embodiments of the present utility model have been described, but the present utility model is not limited to the above-described embodiments, and may be implemented in various modes within the scope of the technical ideas.

Claims (5)

1. A lens barrel module is characterized in that,

the lens barrel module includes:

a fixed cylinder having a cam groove formed on an inner peripheral surface thereof, the cam groove including a spiral groove extending in a spiral shape;

a rotary cylinder disposed radially inward of the fixed cylinder, the rotary cylinder having at least 1 lens and a projection projecting radially outward, the projection being engaged with the cam groove of the fixed cylinder; and

and a cover ring formed of a material harder than the fixed cylinder, the cover ring having a coating portion that covers an outer peripheral surface of a distal end portion of the fixed cylinder, and a circular ring portion that extends from the coating portion to a position radially inward of an inner peripheral edge of the distal end portion of the fixed cylinder.

2. The lens barrel module according to claim 1, wherein,

the cam groove of the fixed cylinder further includes a front end groove extending in a circumferential direction from a front end of the spiral groove,

the coating portion of the cover ring is configured to cover at least a portion of an outer peripheral surface of the front end groove of the cam groove of the fixed cylinder, the outer peripheral surface being located outside.

3. The lens barrel module according to claim 1 or 2, wherein,

the lens barrel module further includes an auxiliary ring closing a gap between the annular portion of the cover ring and an outer peripheral surface of the rotary cylinder, and the auxiliary ring is fixed by being sandwiched between the fixing cylinder and the annular portion of the cover ring.

4. The lens barrel module according to claim 3, wherein,

the auxiliary ring comprises:

a first piece having an inner diameter smaller than an outer diameter of the rotary cylinder, the first piece being formed with a plurality of slits radially extending from a radially inner side; and

and a second sheet disposed on the first sheet and having an inner diameter larger than the inner diameter of the first sheet.

5. An electronic device, characterized in that,

the electronic device has:

the lens barrel module of any one of claims 1 to 4; and

an image pickup element disposed on an optical axis of the at least 1 lens of the lens barrel module.