CN211603669U - Driving device and electronic apparatus - Google Patents

Abstract

A driving device and an electronic apparatus are provided, which can restrain the failure caused by the impact of falling or collision. The drive device includes: a guide screw rod which rotates around a rotating shaft and has a thread formed on an outer circumferential surface; a rod-shaped guide member; a movable member that is movable along the guide member; a movable screw member that moves along the guide member together with the movable member and is rotatable about the guide member as a rotation axis, and that has a screw portion that is engageable with a part of the screw thread in a circumferential direction of an outer circumferential surface of the screw thread; a force application member connected to the moving member and applying force to the moving screw member to bring the screw portion into contact with the screw thread; and a release mechanism that supports the movable screw member so that the screw portion is in contact with the thread in a state where a force applied to the movable member in the extending direction of the rotating shaft is smaller than a predetermined value, and moves the screw portion in a direction away from the thread against the urging force of the urging member in a state where the force is equal to or greater than the predetermined value.

Description

Driving device and electronic apparatus

Technical Field

The utility model discloses a form relates to a drive arrangement for electronic equipment such as smart mobile phone.

Background

In a structure in which a guide screw is engaged with a split nut, a lens driving device is known in which a motor rotates the guide screw to drive a lens connected to the split nut. Such a lens driving device is disclosed in, for example, patent document 1.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2016-51075

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved by the utility model

In the lens driving device described in patent document 1, a lens frame having a split nut is supported by a guide shaft so as to be movable in the optical axis direction of a lens. The motor is directly connected to the guide screw, and is supported by the guide shaft so as to be rotatable about the guide shaft. Further, in order to prevent the guide screw and the split nut from shaking, the motor applies force by the urging member to press the guide screw toward the split nut. However, when a strong impact is applied to the lens frame from the outside in a state where the guide screw is engaged with the split nut, the impact may not be absorbed, and the lens driving device may be broken or damaged. Therefore, a technique for suppressing a failure or breakage due to an impact is required.

Technical scheme for solving technical problem

The utility model discloses a solve above-mentioned technical problem etc. and adopt following technical scheme. In the following description, the reference signs in the drawings are shown in parentheses for the convenience of understanding the present invention, but the constituent elements of the present invention are not limited by the reference signs, but should be construed broadly as a range that can be understood by those skilled in the art.

A technical scheme of the utility model is a drive arrangement, include:

a guide screw (13) that rotates about a rotating shaft (A1) extending in the axial direction and has a thread (13a) formed on the outer circumferential surface thereof;

a motor (16) that drives the lead screw to rotate;

a rod-shaped guide member (15) extending in the axial direction;

a moving member (12) that is movable along the guide member;

a moving screw member (21) that moves along the guide member together with the moving member and is rotatable with the guide member as a rotation axis, the moving screw member having a threaded portion (21d), the threaded portion (21d) being engageable with a part of the thread of the outer circumferential surface in a circumferential direction;

a biasing member (12f) that is connected to the moving member and biases the moving screw member to bring the screw portion into contact with the screw thread; and

and a release mechanism (10, 20) that supports the movable screw member so that the screw portion is in contact with the screw thread in a state where a force applied to the movable member in the direction in which the rotating shaft extends is smaller than a predetermined value, and that moves the screw portion in a direction away from the screw thread against the urging force of the urging member in a state where the force is equal to or greater than the predetermined value.

According to the drive device having the above configuration, for example, in a normal state where a strong force is not applied to the moving member in the extending direction of the guide screw, the thread portion of the moving screw member engages with the thread ridge of the guide screw, and therefore, the moving screw member and the moving member can be moved satisfactorily by the rotation of the guide screw. Further, when a strong force is applied to the movable member in the extending direction, the engagement between the screw portion and the screw thread is released, and therefore the movable member and the movable screw member can be freely moved in the extending direction. Accordingly, the force applied to the moving member can be absorbed by the movement of the moving member and the moving screw member, and therefore, the damage of the screw portion, the screw thread, and the like can be suppressed. Therefore, when a strong impact is applied to the driving device, the driving device can be prevented from being broken or broken due to the impact.

In the drive device, it is preferable that,

the moving threaded member is inserted through by the moving member,

the moving member is inserted through the guide member, and rotation of the moving member about the guide member as a rotation axis is restricted.

According to the drive device having the above configuration, it is possible to easily realize a configuration in which the moving member and the moving screw member can be moved along the guide member. Further, with the movable threaded member, a structure of rotating around the guide member is easily achieved, and with the movable member, rotation around the guide member is restricted, so that rotation due to reaction received from the movable threaded member via the urging member can be prevented.

In the drive device, it is preferable that,

the release mechanism includes:

a convex portion (21k, 21l, 21m, 21n) fixed to one of the moving member and the moving screw member and located around the guide member; and

and a cam member (12k, 12l, 12m, 12n) fixed to the other of the moving member and the moving screw member, the cam member having a slope surface contacting the convex portion, the slope surface rotating the moving screw member to move the screw portion in a direction away from the screw thread when the moving member approaches the moving screw member.

According to the drive device having the above configuration, with the simple configuration of the convex portion and the cam member, when a strong force is applied to the moving member in the extending direction of the guide screw and the moving member and the moving screw member approach each other, the engagement between the screw portion and the screw thread can be released. Further, the manufacturing of the moving member and the moving screw member can be simplified, and the manufacturing cost can be reduced.

In the drive device, it is preferable that,

the moving screw member has a plate-like portion (21b), the plate-like portion (21b) being opposed to the guide screw and extending in a direction away from the guide member,

the screw portion is formed on the plate portion.

According to the drive device having the above configuration, since the shape of the screw portion can be simplified, the movable screw member can be easily manufactured, and the manufacturing cost can be reduced.

In the drive device, it is preferable that,

the urging member is a plate spring.

According to the drive device having the above configuration, the space occupied by the biasing member can be reduced by the configuration in which the plate spring biases the movable screw member, and therefore, the space around the movable member and the movable screw member can be effectively utilized.

In the drive device, it is preferable that,

the thread ridge of the single thread is formed on the outer peripheral surface.

According to the drive device of the above configuration, since the lead of the thread of the guide screw can be reduced, the rotational force transmitted from the motor to the guide screw can be converted into a large propulsive force in the extending direction of the guide screw. This makes it possible to strongly move the moving member in the extending direction, and thus, for example, a camera or the like can be moved satisfactorily. On the other hand, since the linear motion in the extending direction is hardly converted into the rotational motion of the guide screw, when a strong force in the extending direction is applied to the moving member, it is difficult to absorb the force by the rotation of the guide screw. Therefore, for example, in a structure in which the thread of the guide screw and the thread of the movable screw are always engaged with each other, the thread, and the like are highly likely to be damaged. In contrast, in the drive device having the above-described configuration, when a force equal to or greater than a predetermined value is applied, the screw portion moves in a direction away from the thread, and therefore, even if a single-thread screw is used, breakage of the screw portion, the thread, and the like can be suppressed.

The driving device is suitably applied to electronic equipment (4) such as a personal computer, a smartphone, and a tablet computer including a photographing device fixed to the moving member.

According to the electronic apparatus having the above configuration, for example, in a normal state where a strong force is not applied to the moving member in the extending direction of the guide screw, the screw portion of the moving screw member engages with the thread of the guide screw, and therefore, the moving screw member and the moving member can be moved satisfactorily by the rotation of the guide screw. That is, the imaging device can be moved well. Further, when a strong force is applied to the imaging device in the extending direction, the engagement between the screw portion and the screw thread is released, and therefore the imaging device, the moving member, and the moving screw member can be freely moved in the extending direction. Accordingly, the force applied to the imaging device can be absorbed by the movement of the moving member and the moving screw member, and therefore, the damage of the screw portion, the screw thread, and the like can be suppressed. Therefore, when a strong impact is applied to the driving device, the driving device can be prevented from being broken or broken due to the impact.

Drawings

Fig. 1 is a perspective view of the electronic apparatus according to the present embodiment in a state where the camera is housed.

Fig. 2 is a perspective view of the electronic device according to the present embodiment in a state where shooting is possible.

Fig. 3 is a perspective view of the drive device of the present embodiment viewed from the y-axis side.

Fig. 4 is a perspective view of the main body of the drive device of the present embodiment viewed from the y-axis side.

Fig. 5 is a plan view of the driving device of the present embodiment as viewed from the y-axis + side.

Fig. 6 is a perspective view of the driving device of the present embodiment viewed from the y-axis + side.

Fig. 7 is a cross-sectional view at the position of a cross-sectional line D-D in fig. 5 in a screw non-contact state of the driving device of the present embodiment.

Fig. 8 is a perspective view of the camera mounting member of the present embodiment viewed from the y-axis side.

Fig. 9 is an enlarged view of a part of the x-axis + side of the camera mounting member of the present embodiment as viewed from the y-axis side.

Fig. 10 is a plan view of the nut member of the present embodiment as viewed from the y-axis side.

Fig. 11 is a plan view of the nut member of the present embodiment as viewed from the y-axis + side.

Fig. 12 is a plan view of the nut member of the present embodiment as viewed from the z-axis + side.

Fig. 13 is a plan view of the nut member of the present embodiment as viewed from the z-axis side.

Fig. 14 is a sectional view of the drive device of the present embodiment in a state of screw contact.

Fig. 15 is an enlarged view of the camera mounting member and the nut member of the present embodiment in a screw non-contact state.

(symbol description)

1 drive device

2 Camera Unit

4 electronic device

10 release mechanism

11 main body

11a, 11b axle support part

11c connecting part

11d, 11e guide holes

11f, 11g guide screw hole

11h drive shaft hole

11i, 11j sensor hole

11k guide groove

11m column part

11n planar portion

12 camera mounting member

12a, 12b facing each other

12c connecting part

12d camera fixed part

12e light-shielding part

12f arm

12g convex part

12h space

12i, 12j via hole

12k, 12l, 12m, 12n triangular cam

13 guide screw rod

13a thread

14a, 14b bearing

15 guide shaft

16 stepping motor

17 planetary gear reduction mechanism

18 gear box

20 release mechanism

21 nut component

21a cylindrical part

21b plate-like part

21c through hole

21d screw part

21e recess

21k, 21l, 21m, 21n convex parts

31 base plate

32a, 32b sensor

41 rotation driving mechanism

42 support mechanism

43 moving mechanism

44 control mechanism

Detailed Description

The utility model discloses a drive arrangement constitutes to include: a guide screw rod which rotates around a rotating shaft extending in an axial direction and has a thread formed on an outer circumferential surface thereof; a rod-shaped guide member extending in an axial direction; a movable screw member that moves along the guide member together with a movable member that is movable along the guide member, and that has a screw portion; and a release mechanism, one of the features of the drive device of the present invention is as follows. The threaded portion is engageable with a thread of a part of a circumferential direction of an outer peripheral surface of a thread of the guide screw, is rotatable with the guide member as a rotation shaft, and is urged by the urging member to contact the thread. The release mechanism supports the movable screw member so that the screw portion contacts the screw thread in a state where a force applied to the movable member is smaller than a predetermined value. Further, in a state where the force is equal to or greater than the predetermined value, the release mechanism moves the screw portion in a direction away from the thread against the urging force of the urging member.

The embodiments of the present invention will be explained based on the following configurations. However, the embodiments described below are merely examples of the present invention and should not be construed as limiting the technical scope of the present invention. In the drawings, the same components are denoted by the same reference numerals, and the description thereof may be omitted.

1. Detailed description of the preferred embodiments

2. Features of the present embodiment

3. Supplementary items

< 1> embodiment >

Embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view of the electronic apparatus according to the present embodiment in a state where the camera is housed. Fig. 2 is a perspective view of the electronic device according to the present embodiment in a state where shooting is possible. As shown in fig. 1 and 2, the electronic apparatus 4 of the present embodiment includes a drive device 1, a camera unit 2, a display (not shown), and the like. The display panel is a display device such as a liquid crystal display device or an organic EL display device integrally configured with the electronic apparatus 4. The "camera storage state" is a state in which the camera unit 2 is stored in the electronic apparatus 4. The "image-enabled state" is a state in which the camera unit 2 protrudes to the outside of the electronic apparatus 4 and is enabled to take an image. The camera unit 2 is a specific example of the "photographing device".

The x-axis, y-axis and z-axis are shown in the figures. An axis toward a direction in which the camera unit 2 moves when shifting from the camera storage state to the image-enabled state is defined as a "z-axis". An axis perpendicular to the z axis and directed toward the imaging element of the camera unit 2 when viewed from the subject is defined as a "y axis". An axis perpendicular to both the y-axis and the z-axis is defined as an "x-axis". Here, the x-axis, y-axis and z-axis form the three-dimensional rectangular coordinates of the right-hand rule. Hereinafter, the direction of the arrow on the z-axis may be referred to as the + side of the z-axis, the direction opposite to the arrow may be referred to as the-side of the z-axis, and the same applies to other axes.

< electronic apparatus 4>

The electronic device 4 is, for example, a smartphone, a tablet device, a personal computer, or the like. In the present embodiment, the display (not shown) is provided on the y-axis-side surface of the electronic device 4, that is, the surface on the subject side. The camera unit 2 is configured to include a photoelectric conversion element such as a CCD or C-MOS sensor, which functions as an imaging element, and a lens for imaging an object located on the y-axis side with respect to the electronic device 4 at the photoelectric conversion element, and is fixed to the driving device 1. The driving device 1 is fixed inside a housing of the electronic apparatus 4, and moves the camera unit 2 in parallel with the z-axis by the control of the electronic apparatus 4.

In the present embodiment, the electronic apparatus 4 is in the camera storage state in a normal state such as when the power is turned on, and when the user operates the electronic apparatus 4 using the camera, the electronic apparatus 4 shifts to the image-capturing enabled state. At this time, the electronic device 4 controls the driving apparatus 1 to move the camera unit 2 housed inside the housing of the electronic device 4 toward the z-axis + side to be exposed to the outside of the electronic device 4. In the image-enabled state, when the user operates the electronic apparatus 4 to image itself as an object, the electronic apparatus 4 controls the camera unit 2 to image the user, and generates and stores image data as an image capturing result. When the user operates the electronic apparatus 4 to store the camera, the electronic apparatus 4 controls the driving device 1 to move the camera unit 2 toward the z-axis side to be stored in the electronic apparatus 4, thereby shifting to the camera storage state. In this way, by configuring to expose the camera unit 2 to the outside of the electronic device 4 when the subject is imaged, it is possible to eliminate the need to secure a space for disposing the camera unit 2 around the display screen, and thus, the size of the display screen can be increased. That is, the drive device 1 of the present embodiment is particularly useful for portable electronic devices such as smartphones, tablet devices, and personal computers that are expected to be carried by users.

< Driving device 1>

Fig. 3 is a perspective view of the drive device of the present embodiment viewed from the y-axis side. Fig. 4 is a perspective view of the main body of the drive device of the present embodiment viewed from the y-axis side. Fig. 5 is a plan view of the driving device of the present embodiment as viewed from the y-axis + side. Fig. 6 is a perspective view of the driving device of the present embodiment viewed from the y-axis + side. Fig. 7 is a cross-sectional view at the position of a cross-sectional line D-D in fig. 5 in a screw non-contact state of the driving device of the present embodiment. Fig. 5 and 6 show the drive device 1 in a state where the main body 11 is detached. The "thread non-contact state" will be described later. As shown in fig. 3 to 7, the driving device 1 includes a rotation driving mechanism 41, a support mechanism 42, a moving mechanism 43, and a control mechanism 44. Here, a clockwise direction cw is defined as a direction of clockwise rotation when viewed from the z-axis side toward the z-axis + side. The direction of counterclockwise rotation when viewed from the z-axis side toward the z-axis + side is defined as the counterclockwise direction ccw.

< support mechanism 42>

The support mechanism 42 includes a main body 11 and a guide shaft 15.

< body 11>

As shown in fig. 4, the main body 11 is fixed to the electronic apparatus 4 and is formed of resin or metal. The main body 11 includes shaft support portions 11a, 11b and a connecting portion 11 c. The connecting portion 11c is a member for connecting the shaft support portion 11a and the shaft support portion 11b, and includes a columnar portion 11m and a planar portion 11 n. The columnar portion 11m is a columnar member extending in the z-axis direction. The planar portion 11n is a plate-like member extending from the y-axis + side end of the columnar portion 11m toward the x-axis side. Sensor holes 11i and 11j are formed in the x-axis side surface of the columnar portion 11m, and the sensor holes 11i and 11j are through holes having a substantially rectangular cross section. The sensor hole 11j is located on the z-axis + side with respect to the sensor hole 11 i. Further, a guide groove 11k parallel to the z axis is formed on the x axis-side surface of the columnar portion 11m so as to penetrate through substantially the centers of both the sensor holes 11i and 11 j.

The shaft support portion 11a is a substantially plate-shaped member extending from the z-axis-side end of the columnar portion 11m toward the x-axis side. The shaft support portion 11a is formed with a guide screw hole 11f, and the guide screw hole 11f has a circular cross section centered on the rotation axis a 1. Here, the rotation axis a1 is an axis parallel to the z axis and located on the x axis-side with respect to the guide groove 11k of the connection portion 11 c. The shaft support portion 11a is formed with a guide hole 11d, and the guide hole 11d has a circular cross section centered on the rotation axis a 2. Here, the rotation axis a2 is an axis parallel to the z axis and located on the x axis-side with respect to the rotation axis a 1. The guide groove 11k, the rotation shaft a1, and the rotation shaft a2 are located in the same zx plane.

The shaft support portion 11b is a substantially plate-shaped member extending from the z-axis + side end of the columnar portion 11m toward the x-axis side and the x-axis + side, respectively. The shaft support portion 11b is formed with a guide screw hole 11g and a guide hole 11e, the guide screw hole 11g having a circular cross section centered on the rotation axis a1, and the guide hole 11e having a circular cross section centered on the rotation axis a 2. The shaft support 11b has a drive shaft hole 11h formed on the x-axis + side with respect to the columnar portion 11m, and the drive shaft hole 11h has a circular cross section centered on a rotation axis a3 parallel to the z-axis.

< guide shaft 15>

As shown in fig. 3, the guide shaft 15 is a rod-shaped member extending in the z-axis direction. In the present embodiment, the guide shaft 15 is a cylindrical member having the rotation shaft a2 as a center axis, and is formed of resin or metal. The guide shaft 15 is fixed to the body 11 with both ends inserted into the guide hole 11d of the shaft support portion 11a and the guide hole 11e of the shaft support portion 11b, respectively. The guide shaft 15 is a specific example of the "guide member" according to the present invention.

< rotation drive mechanism 41>

As shown in fig. 3 to 7, the rotary drive mechanism 41 includes a guide screw 13, bearings 14a and 14b, a stepping motor 16, a planetary gear reduction mechanism 17, and a gear box 18. Hereinafter, the bearings 14a and 14b may be referred to as bearings 14.

< bearing 14>

The bearing 14 is configured to include, for example, an inner ring (not shown), an outer ring (not shown), and a plurality of balls (not shown). The inner ring is, for example, cylindrical in shape having a through hole into which the diameter of the guide screw 13 can be inserted. The outer ring has a cylindrical shape having an inner diameter larger than an outer shape of the inner ring. The plurality of balls are provided between the inner ring and the outer ring so as to be in contact with both the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring. The bearing 14a is supported by the main body 11 by pressing the outer ring into the guide screw hole 11f of the shaft support portion 11 a. In this state, the inner ring of the bearing 14a is rotatable in the xy plane. The bearing 14b is supported by the main body 11 by pressing the outer ring into the guide screw hole 11g of the shaft support portion 11 b. In this state, the inner ring of the bearing 14b is rotatable in the xy plane.

< guide screw 13>

The guide screw 13 rotates about a rotation axis a1 extending in the z-axis direction, and has a thread 13a formed on the outer circumferential surface. In the present embodiment, the guide screw 13 is a cylindrical male screw having a rotation axis a1 as a central axis, and has a single-thread ridge 13a formed on an outer peripheral surface thereof. Further, a thread of a multiple-start thread may be formed on the outer peripheral surface of the guide screw 13. The guide screw 13 is rotatably supported by the main body 11 through a through hole of an inner ring of the bearing 14a and a through hole of an inner ring of the bearing 14b, respectively, at both ends thereof.

< step Motor 16>

The stepping motor 16 is provided on the z-axis side of the planetary gear reduction mechanism 17 on the x-axis + side with respect to the columnar portion 11m of the main body 11, and drives the guide screw 13 to rotate via the planetary gear reduction mechanism 17 and the gear box 18. The stepping motor 16 is a well-known stepping motor, for example, and has a motor output shaft (not shown) that rotates about a rotation shaft a 3. The stepping motor 16 drives the motor output shaft to rotate by the electric power supplied from the substrate 31.

< planetary gear reduction mechanism 17 and gearbox 18>

The planetary gear reduction mechanism 17 is fixed to the x-axis + side with respect to the columnar portion 11m of the shaft support portion 11b, and a stepping motor 16 is connected to the z-axis side. The gear case 18 is fixed to the z-axis + side of the shaft support portion 11 b. The planetary gear reduction mechanism 17 has a reducer input shaft (not shown) connected to a motor output shaft of the stepping motor 16. The gear case 18 has a gear output shaft (not shown) connected to the guide screw 13. The reduction gear input shaft of the planetary gear reduction mechanism 17 reduces the rotational motion received from the stepping motor 16 at a predetermined reduction ratio, and transmits the rotational motion at the reduced rotational speed to the gear box 18. The gear box 18 has, for example, a plurality of gears through which the rotational motion transmitted from the planetary gear reduction mechanism 17 is transmitted to a gear output shaft.

< control means 44>

The control mechanism 44 includes the substrate 31 and the sensors 32a and 32 b. Hereinafter, the sensors 32a and 32b may be referred to as sensors 32.

< substrate 31>

The substrate 31 is provided on the y-axis + side of the stepping motor 16 and the planetary gear reduction mechanism 17, and is provided with electronic components such as a control IC (not shown) for controlling the stepping motor 16. The substrate 31 is provided with a lead wire for connecting a power supply unit (not shown), the stepping motor 16, the sensor 32, and the like to each other. The control IC controls the stepping motor 16 based on a signal from the sensor 32, for example.

< sensor 32>

The sensor 32 is, for example, a photo interrupter (japanese: フォトインタラプタ) having an コ -shaped groove, and is attached to the substrate 31 (see fig. 3 and 6). The sensor 32 detects whether or not an object is present in the コ -shaped groove. In the present embodiment, the sensor 32 detects whether or not the light shielding portion 12e of the camera attachment member 12 is present in the コ -shaped groove. In a state where the substrate 31 is mounted to the main body 11, the sensor 32a is located inside the sensor hole 11i in an orientation such that the コ -shaped groove is aligned with the guide groove 11k of the main body 11. Also, in the above state, the sensor 32a is located inside the sensor hole 11j in an orientation such that the コ -shaped groove is aligned with the guide groove 11k of the main body 11.

< moving mechanism 43>

The moving mechanism 43 is configured to include the camera mounting member 12 and the nut member 21.

< Camera mounting Member 12>

Fig. 8 is a perspective view of the camera mounting member of the present embodiment viewed from the y-axis side. Fig. 9 is an enlarged view of a part of the x-axis + side of the camera mounting member of the present embodiment as viewed from the y-axis side. As shown in fig. 7 to 9, the camera attachment member 12 is formed of resin or metal, and includes a release mechanism 10, opposing portions 12a and 12b, a connecting portion 12c, a camera fixing portion 12d, a light shielding portion 12e, and an arm portion 12 f. The release mechanism 10 includes triangular cams 12k, 12l, 12m, 12 n. The camera mounting member 12 is a specific example of the "moving member" according to the present invention. Each of the triangular cams 12k, 12l, 12m, 12n is a specific example of the "cam member" according to the present invention.

The connecting portion 12c is a member that connects the facing portion 12a, the facing portion 12b, and the camera fixing portion 12d, and is a substantially quadrangular prism-shaped member extending in the z-axis direction. The facing portion 12a is a plate-like member extending from the z-axis-side end of the connecting portion 12c toward the x-axis + side. The facing portion 12b is a plate-like member facing the facing portion 12a and extending from the z-axis + side end of the connecting portion 12c toward the x-axis + side. A space 12h opened to the y-axis + side and the y-axis-side is formed between the facing portion 12a and the facing portion 12 b.

A light shielding portion 12e is provided on the x-axis + side of the facing portions 12a, 12b, and the light shielding portion 12e connects the end portion on the x-axis + side of the facing portion 12a and the end portion on the x-axis + side of the facing portion 12 b. The facing portions 12a, 12b are formed with through holes 12i, 12j, respectively. Each of the through holes 12i, 12j has a circular cross section centered on the rotation axis a2 and having a diameter slightly larger than the outer diameter of the guide shaft 15.

In order to avoid physical contact with the guide screw 13, a part of the opposing portion 12a located between the light shielding portion 12e and the through hole 12i is cut into the y-axis + side. Similarly, in order to avoid physical contact with the guide screw 13, a part of the opposing portion 12b located between the light shielding portion 12e and the through hole 12j is cut into the y-axis + side.

The cam cams 12m and 12n are fixed to the periphery of the through hole 12j on the z-axis side surface of the facing portion 12b, i.e., the surface facing the facing portion 12a (see fig. 9). The triangular cam 12m is provided along the edge of the through-hole 12j and has a slope of a constant width. The inclined surface of the triangular cam 12m approaches the facing portion 12a as it goes in the counterclockwise direction ccw. The cam 12n is located on the opposite side of the cam 12m with respect to the rotation shaft a2, is disposed along the edge of the through hole 12j, and has a slope having a width substantially the same as the width of the cam 12 m. The inclined surface of the triangular cam 12n approaches the facing portion 12a as it goes in the counterclockwise direction ccw.

The cam cams 12k and 12l are fixed to the periphery of the through hole 12i on the surface on the z-axis + side of the facing portion 12a, i.e., the surface facing the facing portion 12b (see fig. 8). The triangular cam 12k is provided along the edge of the through hole 12i, and has a slope having a width substantially the same as that of the slope of the triangular cam 12 m. The inclined surface of the triangular cam 12k faces the inclined surface of the triangular cam 12m across the space 12h, and approaches the facing portion 12b as the counterclockwise direction ccw advances. The cam 12l is located on the opposite side of the cam 12k with respect to the rotation shaft a2, is provided along the edge of the through hole 12i, and has a slope having a width substantially the same as that of the slope of the cam 12 m. The inclined surface of the triangular cam 12l faces the inclined surface of the triangular cam 12m across the space 12h, and approaches the facing portion 12b as the counterclockwise direction ccw advances.

The camera fixing portion 12d is a substantially columnar member extending from the connecting portion 12c toward the x-axis side, and is fixed to the camera unit 2. In the present embodiment, the camera fixing portion 12d has a groove (see fig. 7) opened to the y-axis + side for attaching the camera unit 2. The arm portion 12f is a member having flexibility to function as a leaf spring, and the arm portion 12f is connected to the connecting portion 12 c. In the present embodiment, the arm portion 12f is connected to an angle formed by the x-axis + side surface and the y-axis + side surface of the connecting portion 12c, and the arm portion 12f has a plate-like shape that covers a part of the y-axis + side opening of the space 12h and extends toward the x-axis + side (see fig. 7 and 9). The width of the arm portion 12f in the z-axis direction is smaller than the distance between the facing portion 12a and the facing portion 12 b. A projection 12g (see fig. 8) projecting toward the y-axis side is provided at the x-axis + side end of the arm 12 f. The convex portion 12g has an arc-shaped cross section that is curved when viewed from the z-axis direction and protrudes toward the y-axis side. The arm portion 12f is a specific example of the "urging member" according to the present invention.

< nut Member 21>

Fig. 10 is a plan view of the nut member of the present embodiment as viewed from the y-axis side. Fig. 11 is a plan view of the nut member of the present embodiment as viewed from the y-axis + side. Fig. 12 is a plan view of the nut member of the present embodiment as viewed from the z-axis + side. Fig. 13 is a plan view of the nut member of the present embodiment as viewed from the z-axis side. As shown in fig. 10 to 13, the nut member 21 is formed of resin or metal, and includes a release mechanism 20, a cylindrical portion 21a, a plate-like portion 21b, and a threaded portion 21 d. The release mechanism 20 includes convex portions 21k, 21l, 21m, 21 n. The nut member 21 is a specific example of the "movable screw member" of the present invention.

The cylindrical portion 21a has a through hole 21 c. The through hole 21c has a circular cross section centered on the rotation axis a2 and having a diameter slightly larger than the outer diameter of the guide shaft 15. On the surface of the cylindrical portion 21a on the z-axis + side, that is, the surface facing the facing portion 12b of the camera mounting member 12, convex portions 21m, 21n protruding toward the z-axis + side are fixed so as to be positioned around the through hole 21c, specifically, at the edge of the through hole 21 c. The projection 21n is located on the opposite side of the projection 21m with respect to the rotation axis a 2. The convex portion 21m has an arc-shaped cross section which is curved when the convex portion 21m is viewed from the rotation axis a2 and projects toward the z-axis + side. The convex portion 21n has substantially the same shape as the convex portion 21m, and has an arc-shaped cross section which is curved when the convex portion 21n is viewed from the rotation axis a2 and projects toward the z-axis + side.

On the z-axis-side surface of the cylindrical portion 21a, that is, the surface facing the facing portion 12a of the camera mounting member 12, convex portions 21k, 21l protruding toward the z-axis side are fixed so as to be positioned around the through hole 21c, specifically, at the edge of the through hole 21 c. The projection 21l is located on the opposite side of the projection 21k with respect to the rotation axis a 2. The convex portion 21k has substantially the same shape as the convex portion 21m, and has an arc-shaped cross section which is curved and protrudes toward the z-axis-side when the convex portion 21k is viewed from the rotation axis a 2. The convex portion 21l has substantially the same shape as the convex portion 21m, and has an arc-shaped cross section which is curved and protrudes toward the z-axis-side when the convex portion 21l is viewed from the rotation axis a 2.

The plate-like portion 21b faces the guide screw 13 and extends in a direction away from the guide shaft 15 (see fig. 7). In the present embodiment, the plate-shaped portion 21b is a plate-shaped member that is connected to the side surface of the cylindrical portion 21a and extends in a direction away from the rotation axis a 2. The plate-shaped portion 21b has a first surface parallel to the rotation axes a1, a2 and facing the guide screw 13, and a second surface parallel to the rotation axes a1, a2 and facing the arm portion 12f of the camera attachment member 12. A threaded portion 21d is formed on a first surface of the plate-shaped portion 21b, and the threaded portion 21d is engageable with a part of the thread 13a in the circumferential direction of the outer peripheral surface of the thread 13a of the guide screw 13. Specifically, the thread 21d is a split nut having a thread formed on a flat surface. A concave portion 21e is formed on the second surface of the plate-shaped portion 21b, and the convex portion 12g of the arm portion 12f is fitted into the concave portion 21 e.

< operation of drive device 1>

< thread contact State >

Here, the operation of the drive device 1 will be described. Fig. 14 is a sectional view of the drive device of the present embodiment in a state of screw contact. Fig. 14 is a cross section of the drive device 1, i.e., a cross section parallel to the xy plane including the arm portion 12f, as viewed from the z-axis side. As shown in fig. 3, 5, 6, and 14, in a normal state in which the force applied to the camera attachment member 12 in the extending direction of the rotation axis a1 is smaller than the predetermined value C1, the releasing mechanisms 10 and 20 support the nut member 21 so that the threaded portion 21d of the nut member 21 comes into contact with the thread 13a of the guide screw 13.

In the present embodiment, the nut member 21 is disposed in the space 12h of the camera mounting member 12. At this time, on the z-axis-side with respect to the cylindrical portion 21a of the nut member 21, the inclined surface of the triangular cam 12k of the camera mounting member 12 abuts against the convex portion 21k of the nut member 21, and the inclined surface of the triangular cam 12l abuts against the convex portion 21l of the nut member 21. Further, on the z-axis + side with respect to the cylindrical portion 21a of the nut member 21, the inclined surface of the triangular cam 12m of the camera attachment member 12 abuts against the convex portion 21m of the nut member 21, and the inclined surface of the triangular cam 12n abuts against the convex portion 21n of the nut member 21.

The through holes 12i, 12j of the camera mounting member 12 and the through hole 21c of the nut member 21 are through which the guide shaft 15 is inserted. At this time, the light shielding portion 12e of the camera mounting member 12 is fitted into the guide groove 11k of the main body 11. Thereby, the camera attachment member 12 is movable along the guide shaft 15, that is, in the z-axis direction. Further, since the light shielding portion 12e is fitted in the guide groove 11k, the camera attachment member 12 is restricted from rotating about the guide shaft 15. The nut member 21 is movable along the guide shaft 15, i.e., in the z-axis direction, together with the camera mounting member 12. The nut member 21 is rotatable about the guide shaft 15 as a rotation axis.

The arm portion 12f of the camera mounting member 12 urges the nut member 21 to rotate, thereby bringing the threaded portion 21d of the nut member 21 into contact with the thread ridge 13a of the guide screw 13. In the present embodiment, the arm portion 12f biases the plate-shaped portion 21b of the nut member 21 in the counterclockwise direction ccw by fitting the convex portion 12g into the concave portion 21e of the nut member 21. Thereby, the threaded portion 21d of the nut member 21 engages with the thread ridge 13a of the guide screw 13, and the z-axis direction movement of the camera mounting member 12 is restricted.

By engaging the threaded portion 21d with the thread ridge 13a of the guide screw 13, the nut member 21 is fixed by the guide shaft 15 and the guide screw 13 without rotating the guide screw 13. Further, the camera mounting member 12 is fixed by the fixed nut member 21, the guide shaft 15, and the guide groove 11 k.

On the other hand, in the case where the guide screw 13 is rotated, the rotational motion of the guide screw 13 is converted into a linear motion in the z-axis direction by the nut member 21, so that the nut member 21 is moved along the guide shaft 15. Further, the camera mounting member 12 moves along the guide shaft 15 together with the nut member 21.

< exposing operation of Camera Unit 2>

For example, a situation is expected in which the camera mounting member 12 is located on the z-axis side and the camera unit 2 is housed inside the case of the electronic apparatus 4 (see fig. 1). When the user operates the electronic apparatus 4 using the camera, the control IC on the substrate 31 controls the stepping motor 16 to rotate the guide screw 13, thereby moving the camera mounting member 12 to the z-axis + side. When the light shielding portion 12e of the camera mounting member 12 enters the コ -shaped groove of the sensor 32b, the sensor 32b detects the presence of an object in the groove and outputs the detection result to the control IC on the substrate 31. The control IC stops the stepping motor 16 based on the detection result received from the sensor 32 b. Thereby, the camera unit 2 is exposed to the outside of the electronic apparatus 4, and the electronic apparatus 4 is shifted to the image-taking-enabled state.

< storing operation of camera unit 2>

For example, a situation is expected in which the camera mounting member 12 is positioned on the z-axis + side and the camera unit 2 is exposed to the outside of the electronic apparatus 4 (see fig. 2). When the user operates the electronic apparatus 4 to store the camera, the control IC on the board 31 controls the stepping motor 16 to rotate the guide screw 13, thereby moving the camera mounting member 12 to the z-axis side. When the light shielding portion 12e of the camera mounting member 12 enters the コ -shaped groove of the sensor 32a, the sensor 32a detects the presence of an object in the groove, and outputs the detection result to the control IC on the substrate 31. The control IC stops the stepping motor 16 based on the detection result received from the sensor 32 a. Thereby, the camera unit 2 is housed inside the electronic apparatus 4, and the electronic apparatus 4 shifts to a camera housing state.

< thread non-contact State >

Fig. 15 is an enlarged view of the camera mounting member and the nut member of the present embodiment in a screw non-contact state. As shown in fig. 3, 7, and 15, in a state where the force applied to the camera attachment member 12 in the extending direction of the rotation axis a1 is equal to or greater than the predetermined value C1, the release mechanisms 10 and 20 move the threaded portion 21d of the nut member 21 in a direction away from the thread 13a of the guide screw 13 against the biasing force of the arm portion 12f of the camera attachment member 12.

Specifically, for example, a situation is expected in which the camera unit 2 is strongly pulled out toward the z-axis + side. In this state, the camera unit 2 slightly moves the camera attachment member 12 to the z-axis + side, and the facing portion 12a of the camera attachment member 12 and the cylindrical portion 21a of the nut member 21 come close to each other, that is, the distance between the facing portion 12a and the cylindrical portion 21a becomes short.

At this time, the inclined surface of the triangular cam 12k rotates the nut member 21 via the convex portion 21k to move the threaded portion 21d of the nut member 21 in a direction away from the thread ridge 13a of the guide screw 13. Similarly, the inclined surface of the triangular cam 12l rotates the nut member 21 via the convex portion 21l to move the threaded portion 21d of the nut member 21 in a direction away from the thread ridge 13a of the guide screw 13. That is, the inclined surface of the cam 12k and the inclined surface of the cam 12l rotate the nut member 21 in the clockwise direction cw about the guide shaft 15 (see fig. 7).

On the other hand, for example, when the camera unit 2 is strongly pushed in toward the z-axis side, the camera unit 2 slightly moves the camera attachment member 12 toward the z-axis side, and the facing portion 12b of the camera attachment member 12 and the cylindrical portion 21a of the nut member 21 come close to each other, that is, the distance between the facing portion 12b and the cylindrical portion 21a becomes short.

At this time, the inclined surface of the triangular cam 12m rotates the nut member 21 via the convex portion 21m so that the threaded portion 21d of the nut member 21 moves in a direction away from the thread ridge 13a of the guide screw 13. Similarly, the inclined surface of the triangular cam 12n rotates the nut member 21 via the convex portion 21n to move the threaded portion 21d of the nut member 21 in a direction away from the thread ridge 13a of the guide screw 13. That is, the inclined surface of the cam 12m and the inclined surface of the cam 12n rotate the nut member 21 in the clockwise direction cw about the guide shaft 15 (see fig. 7).

That is, even if the camera unit 2 is pulled out strongly or pushed in strongly, the engagement of the threaded portion 21d of the nut member 21 with the thread ridge 13a of the guide screw 13 can be released. This enables the nut member 21 and the camera mounting member 12 to be freely moved along the guide shaft 15, thereby preventing damage to the screw portion 21d, the screw thread 13a, and the like.

< 2> characteristics of the present embodiment

According to the driving device configured as described above, for example, in a normal state where a strong force is not applied to the camera mounting member 12 in the extending direction of the guide screw 13, the threaded portion 21d of the nut member 21 is engaged with the thread 13a of the guide screw 13, and therefore, the nut member 21 and the camera mounting member 12 can be moved well by the rotation of the guide screw 13. When a strong force is applied to the camera mounting member 12 in the extending direction, the engagement between the threaded portion 21d and the thread 13a is released, and therefore the camera mounting member 12 and the nut member 21 can be freely moved in the extending direction. Accordingly, the force applied to the camera mounting member 12 can be absorbed by the movement of the camera mounting member 12 and the nut member 21, and therefore, the damage of the screw portion 21d, the screw thread 13a, and the like can be suppressed. Therefore, when a strong impact is applied to the drive device 1, the drive device 1 can be prevented from being broken or broken by the impact.

In the drive device having the above configuration, the guide shaft 15 is inserted through the nut member 21, the guide shaft 15 is inserted through the camera mounting member 12, and the rotation of the camera mounting member 12 about the guide shaft 15 is restricted, so that the camera mounting member 12 and the nut member 21 can be easily moved along the guide shaft 15. Further, with the nut member 21, the structure of rotating about the guide shaft 15 can be simply realized, and with the camera mounting member 12, the rotation about the guide shaft 15 is restricted, so that the rotation due to the reaction received from the nut member 21 via the arm portion 12f can be prevented.

In the driving device having the above-described configuration, the convex portions 21k, 21l, 21m, and 21n are fixed to the nut member 21 and positioned around the guide shaft 15. Further, the triangular cams 12k, 12l, 12m, 12n are fixed to the camera mounting member 12, and have inclined surfaces that come into contact with the convex portions 21k, 21l, 21m, 21n, respectively. When the camera mounting member 12 approaches the nut member 21, the inclined surface rotates the nut member 21 so that the threaded portion 21d of the nut member 21 moves in a direction away from the thread ridge 13a of the guide screw 13. Accordingly, with a simple configuration of the convex portions 21k, 21l, 21m, 21n and the triangular cams 12k, 12l, 12m, 12n, when a strong force is applied to the camera mounting member 12 along the extending direction of the guide screw 13 and the camera mounting member 12 and the nut member 21 approach each other, the engagement between the screw portion 21d and the screw thread 13a can be released. Further, the manufacture of the camera mounting member 12 and the nut member 21 can be simplified, and the manufacturing cost can be reduced.

In the driving device having the above-described configuration, the plate-shaped portion 21b of the nut member 21 faces the guide screw 13 and extends in the direction away from the guide shaft 15, and the threaded portion 21d is formed in the plate-shaped portion 21b, so that the shape of the threaded portion 21d can be simplified, and therefore, the nut member 21 can be manufactured easily, and the manufacturing cost can be reduced.

In the drive device having the above configuration, the arm portion 12f of the camera mounting member 12 is a plate spring, and therefore, the space occupied by the arm portion 12f can be reduced by the configuration in which the nut member 21 is biased by the arm portion 12f, and therefore, the space around the camera mounting member 12 and the nut member 21 can be effectively utilized.

In the drive device having the above-described configuration, since the single-thread ridge 13a is formed on the outer peripheral surface of the guide screw 13, the lead of the thread ridge 13a of the guide screw 13 can be reduced, and thus the rotational force applied to the guide screw 13 from the stepping motor 16 can be converted into a large propulsive force in the extending direction of the guide screw 13. This enables the camera mounting member 12 to be moved strongly in the extending direction, and thus enables the camera unit 2 to be moved satisfactorily. On the other hand, since the linear motion in the extending direction is hardly converted into the rotational motion of the guide screw 13, when a strong force in the extending direction is applied to the camera mounting member 12, it is difficult to absorb the force by the rotation of the guide screw 13. Therefore, for example, in a configuration in which the thread 13a of the guide screw 13 and the thread 21d of the nut member 21 are always engaged with each other, the thread 21d, the thread 13a, and the like are highly likely to be damaged. In contrast, in the drive device having the above-described configuration, when a force equal to or greater than the predetermined value C1 is applied, the screw portion 21d moves in a direction away from the thread ridge 13a, and therefore, even if a single-thread screw is used, breakage of the screw portion 21d, the thread ridge 13a, and the like can be suppressed.

<3. supplementary items >

The embodiments of the present invention have been specifically described above. The above description is merely an explanation of one embodiment, and the scope of the present invention is not limited to the above embodiment, but should be interpreted broadly as a scope that can be grasped by those skilled in the art.

In the driving device of the present embodiment, the description has been given of the configuration in which the triangular cams 12k, 12l, 12m, 12n are provided on the camera mounting member 12 and the convex portions 21k, 21l, 21m, 21n are provided on the nut member 21, but the configuration may be such that the triangular cams 12k, 12l, 12m, 12n are provided on the nut member 21 and the convex portions 21k, 21l, 21m, 21n are provided on the camera mounting member 12.

In the drive device of the present embodiment, the structure in which the arm portion 12f functioning as a leaf spring is a specific example of the "urging member" has been described, but another type of spring such as a coil spring may be used as the "urging member".

In the driving device of the present embodiment, the screw portion 21d of the nut member 21 is formed in the plate-shaped portion 21b, but the screw portion 21d may be a split nut having a thread formed on a curved surface curved along the outer peripheral surface of the guide screw 13.

(availability in industry)

The utility model discloses be fit for being used for making the shooting device towards the outside outstanding drive arrangement of electronic equipment.

Claims (11)

1. A drive device, comprising:

a guide screw rod which rotates around a rotating shaft extending in an axial direction and has a thread formed on an outer circumferential surface thereof;

a motor that drives the lead screw to rotate;

a guide member of a rod shape extending in the axial direction;

a moving member that is movable along the guide member;

a moving screw member that moves along the guide member together with the moving member and is rotatable with the guide member as a rotation axis, the moving screw member having a screw portion engageable with the thread of a part of the outer circumferential surface in a circumferential direction of the thread;

a force application member connected to the moving member and applying a force to the moving screw member to bring the screw portion into contact with the screw thread; and

and a release mechanism that supports the movable screw member so that the screw portion is in contact with the screw thread in a state where a force applied to the movable member in an extending direction of the rotating shaft is smaller than a predetermined value, and moves the screw portion in a direction away from the screw thread against an urging force of the urging member in a state where the force is equal to or greater than the predetermined value.

2. The drive of claim 1,

the moving threaded member is inserted through by the moving member,

the moving member is inserted through the guide member, and rotation of the moving member about the guide member as a rotation axis is restricted.

3. The drive of claim 1,

the release mechanism includes:

a convex portion fixed to one of the moving member and the moving screw member and located around the guide member; and

and a cam member fixed to the other of the moving member and the moving screw member, the cam member having a slope surface contacting the convex portion, the slope surface rotating the moving screw member to move the screw portion in a direction away from the screw thread when the moving member approaches the moving screw member.

4. The drive of claim 2,

the release mechanism includes:

a convex portion fixed to one of the moving member and the moving screw member and located around the guide member; and

and a cam member fixed to the other of the moving member and the moving screw member, the cam member having a slope surface contacting the convex portion, the slope surface rotating the moving screw member to move the screw portion in a direction away from the screw thread when the moving member approaches the moving screw member.

5. The drive device according to any one of claims 1 to 4,

the moving screw member has a plate-like portion that faces the guide screw and extends in a direction away from the guide member,

the screw portion is formed on the plate portion.

6. The drive device according to any one of claims 1 to 4,

the urging member is a plate spring.

7. The drive of claim 5,

the urging member is a plate spring.

8. The drive device according to any one of claims 1 to 4, 7,

the thread ridge of the single thread is formed on the outer peripheral surface.

9. The drive of claim 5,

the thread ridge of the single thread is formed on the outer peripheral surface.

10. The drive of claim 6,

the thread ridge of the single thread is formed on the outer peripheral surface.

11. An electronic device, comprising:

the drive device of any one of claims 1 to 10; and

a camera fixed to the moving member.

Images