JP2020088773A - Expansion mechanism and electronic apparatus - Google Patents

Abstract

To provide an expansion mechanism preventing abrasion due to a ground member, and an electronic apparatus.SOLUTION: An expansion mechanism 10 comprises: a first cylindrical member 11; and a second cylindrical member 12 which is housed in the first cylindrical member 11 in a contraction state and is projected from the first cylindrical member 11 in an extension state. The second cylindrical member 12 includes a fixed part 120, and the fixed part 120 includes: a ground member 128; an energization member 126; and a roller 122 provided to the energization member 126. The energization member 126 energizes the roller 122 to a negative X direction, and the ground member 128 and the first cylindrical member 11 are contacted in the contraction state and the extension state. At the movement of the second cylindrical member 12, the ground member 128 and the first cylindrical member 11 are separated by the contact of the first cylindrical member 11 and the roller 122.SELECTED DRAWING: Figure 4

Description

The present invention relates to a telescopic mechanism and electronic equipment.

Conventionally, there has been known a document camera that images a document or an image and displays the imaged data via a personal computer, a projector, or the like. Document cameras are becoming popular in place of OHP (Overhead Projector). Some such document cameras have an arm provided with a telescopic mechanism in order to dispose the main body and the image pickup device apart from each other. For example, Patent Document 1 discloses a document camera including a camera and a stand unit as an arm.

JP, 2016-32945, A

However, the document camera described in Patent Document 1 has a problem that, when the stand portion is provided with the expansion/contraction mechanism, the stand portion and the grounding member for securing the ground are easily worn. Specifically, in the document camera, it is necessary to electrically connect the imaging device and the main body in order to secure the grounding of the imaging device. When a metal is used for the stand part and the ground member and the stand part are in contact with each other, the ground member and the stand part slide when the stand part expands and contracts. Therefore, the stand portion or the grounding member may be worn to generate abrasion powder. In the document camera, the abrasion powder sometimes causes a short circuit in the live part and a deterioration in appearance quality. That is, not only the document camera but also the electronic device having the expansion/contraction mechanism has been required to have the expansion/contraction mechanism for preventing the wear due to the ground member.

An expansion/contraction mechanism of the present application is an expansion/contraction mechanism for electronic devices, including a first tubular member having a longitudinal direction, and a first tubular member in a contracted state in the extension/contraction mechanism, and a first tubular member in a stretched state. A second tubular member projecting from the member and movable along the longitudinal direction, the second tubular member has a fixing portion for the first tubular member, and the fixing portion is a grounding member; A biasing member and a cushioning member attached to the biasing member. The biasing member biases the cushioning member in the first direction and, in the contracted state and the stretched state, the grounding member and the first tubular shape. When the second tubular member moves along the longitudinal direction in the process between the contracted state and the stretched state in contact with the member, the first tubular member and the cushioning member come into contact with each other so that the biasing member is The ground member and the first tubular member are separated from each other by being urged in the second direction opposite to the first direction.

In the expansion and contraction mechanism described above, in the contracted state and the stretched state, the ground member and the urging member are separated from each other, and when the second tubular member moves along the longitudinal direction, the ground member and the urging member come into contact with each other, It is preferable that the ground member is biased in the second direction.

In the above-described expansion/contraction mechanism, in the contracted state and the stretched state, the ground member and the urging member are in contact with each other, the ground member is urged in the first direction, and when the second tubular member moves in the longitudinal direction, It is preferable that the biasing member and the ground member are separated from each other.

In the above-described expansion/contraction mechanism, the first tubular member has an opening, the cushioning member is a roller, and when the second tubular member moves in the longitudinal direction, the roller causes the inner wall of the first tubular member to move. In the contracted state and the stretched state, the roller fits into the opening and the first tubular member and the second tubular member are fixed to each other.

An expansion/contraction mechanism of the present application is an expansion/contraction mechanism for electronic devices, including a first tubular member having a longitudinal direction, and a first tubular member in a contracted state in the extension/contraction mechanism, and a first tubular member in a stretched state. A second tubular member protruding from the member and movable along the longitudinal direction and having an opening, wherein the first tubular member has a fixing portion for the second tubular member, and the fixing portion is A grounding member, a biasing member, and a roller attached to the biasing member. The biasing member biases the roller in the second direction, and biases the grounding member in the contracted state and the stretched state. The biasing member is separated from each other, the ground member and the second tubular member are in contact with each other, the roller is fitted into the opening portion, and the first tubular member and the second tubular member are fixed, and the contracted state is obtained. During the process between the stretched state and the stretched state, when the second tubular member moves along the longitudinal direction, the roller rotates while contacting the second tubular member, and the second tubular member and the roller come into contact with each other. Thereby, the biasing member is biased in the first direction opposite to the second direction, the grounding member and the biasing member come into contact with each other, and the grounding member and the second tubular member are separated from each other.

An electronic device of the present application includes the above-described expansion/contraction mechanism, an imaging device attached to the second tubular member, and a base portion attached to the first tubular member.

FIG. 3 is a perspective view showing the outer appearance of the document camera according to the first embodiment. FIG. 3 is a perspective view showing the outer appearance of a document camera that stores a telescopic mechanism and an imaging device. The perspective view which shows the appearance of the stretched state of a telescopic mechanism. The perspective view which shows the appearance of the contraction state of an expansion-contraction mechanism. The disassembled perspective view which shows the structure of an expansion-contraction mechanism. The perspective view which shows the external appearance of a fixed part. The expanded sectional view which shows the locked state of an expansion-contraction mechanism. FIG. 6 is an enlarged cross-sectional view showing a state during expansion/contraction operation of the expansion/contraction mechanism. The expanded sectional view which shows the locked state in the expansion-contraction mechanism of the document camera which concerns on 2nd Embodiment. FIG. 6 is an enlarged cross-sectional view showing a state in which the expanding and contracting mechanism is expanding and contracting. Sectional drawing which shows the extending state of an expansion-contraction mechanism. The expanded sectional view which shows the locked state of the expansion-contraction mechanism of the document camera which concerns on a modification. FIG. 6 is an enlarged cross-sectional view showing a state during expansion/contraction operation of the expansion/contraction mechanism.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiment described below describes an example of the present invention. The present invention is not limited to the following embodiments, and various modifications carried out without departing from the scope of the present invention are also included in the present invention. In each of the following drawings, the scale of each member is different from the actual scale in order to make each member recognizable.

Further, in each of the following drawings, XYZ axes, which are coordinate axes orthogonal to each other, are added as necessary. In that case, the XYZ axes in each figure are such that the XY plane coincides with the substantially horizontal plane, and the direction indicated by the arrow of the Z axis, that is, the positive Z direction is substantially opposite to the direction of gravity. The positive Z direction may be referred to as “upward” and the negative Z direction may be referred to as “downward”.

1. First Embodiment In the present embodiment, a document camera provided with an imaging device will be described as an example of an electronic device.

1.1. Document Camera The document camera according to the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing the outer appearance of the document camera according to the embodiment. FIG. 2 is a perspective view showing the outer appearance of a document camera in which the expansion mechanism and the imaging device are stored. Note that FIG. 1 shows a form when the document camera is used.

As shown in FIG. 1, a document camera 100 as an electronic device according to this embodiment includes an expansion/contraction mechanism 10 for an electronic device, a base unit 30, and an imaging device 50. The expansion/contraction mechanism 10 is an expansion/contraction mechanism for a document camera, and includes a first tubular member 11 and a second tubular member 12.

The document camera 100 is used with the base unit 30 placed on a desk or the like. The base portion 30 is a substantially rectangular parallelepiped member elongated in the Y direction. An operation panel 31 is provided on the upper surface of the base portion 30. Various switches for operating the document camera 100 are arranged on the operation panel 31. Examples of various switches include a camera switch, an autofocus switch, a zoom switch, a light source switch, a source search switch, and a hook button.

A recessed storage portion 32 is provided on the side surface of the base portion 30 on the positive X direction side. When the document camera 100 is not used, the expansion/contraction mechanism 10 and the imaging device 50 can be folded and stored in the storage section 32. Here, although not shown, the power for driving the document camera 100 may be externally supplied by a power cord or the like, or may be supplied from a battery including a secondary battery built in the base unit 30. Good.

Although not shown, the base unit 30 is provided with a USB connector for connecting the document camera 100 and an electronic device such as a personal computer or a projector.

The first tubular member 11 of the expansion/contraction mechanism 10 is attached near the negative Y-direction side end of the storage portion 32. When the document camera 100 is used, the extension/contraction mechanism 10 is erected in the Z direction. Here, FIG. 1 shows a stretched state in the extension/contraction mechanism 10, that is, a state in which the second tubular member 12 is projected from the first tubular member 11. The document camera 100 may be used in the retractable mechanism 10 in the contracted state in which the second tubular member 12 is housed in the first tubular member 11. Details of the expansion/contraction mechanism 10 will be described later.

An imaging device 50 is attached to the upper end of the second tubular member 12. The imaging device 50 is an arm-shaped member elongated in the X direction, one end of the arm shape is attached to the upper end of the second tubular member 12, and the other end of the arm shape extends in the positive X direction. A camera 51 and a light emitting diode 52 as a light source are provided at the other end of the arm shape, that is, at the end of the imaging device 50 in the positive X direction. The camera 51 and the light emitting diode 52 are arranged downward.

The camera 51 includes an image sensor and a lens. The image sensor is, for example, an image sensor such as a CCD (Charge Coupled Device) system or a CMOS (Complementary Metal Oxide Semiconductor) system. The light emitting diode 52 illuminates an object to be imaged by the document camera 100 such as a document or an image. The camera 51 takes an image of an image pickup target illuminated by the light emitting diode 52 and captures it as electronic data. Therefore, in the document camera 100, the imaging target is placed below the camera 51 and the light emitting diode 52 for use.

As shown in FIG. 2, in the document camera 100, the expansion mechanism 10 and the imaging device 50 can be folded and stored in the storage section 32. At this time, the expansion/contraction mechanism 10 is in a contracted state in which the second tubular member 12 is housed in the first tubular member 11. Folding the document camera 100 into a substantially rectangular parallelepiped facilitates transportation and storage. The expansion/contraction mechanism 10 is adopted to satisfy the requirements such as folding the document camera 100 and securing a distance between the imaging target and the camera 51 when the document camera 100 is used.

In addition, in the present embodiment, the form in which the imaging device 50 is attached to the extension mechanism 10 is illustrated, but the present invention is not limited to this. A small projection type display device may be attached to the extension/contraction mechanism 10, or another device may be attached.

1.2. Stretching Mechanism The configuration of the stretching mechanism 10 will be described with reference to FIGS. 3A, 3B, 4 and 5. FIG. 3A is a perspective view showing the external appearance of the stretchable mechanism in a stretched state. FIG. 3B is a perspective view showing the outer appearance of the retractable mechanism in a contracted state. FIG. 4 is an exploded perspective view showing the structure of the expansion/contraction mechanism. FIG. 5 is a perspective view showing the outer appearance of the fixing portion. 3A and 3B, only the expansion/contraction mechanism 10 is shown, and the illustration of other components of the document camera 100 is omitted. In FIG. 3B, the viewing direction is changed with respect to FIG. 3A. In FIG. 4, the portion corresponding to the area C shown in FIG. 3A is disassembled and displayed.

As shown in FIG. 3A, in the stretched state of the extension/contraction mechanism 10, the second tubular member 12 projects from the first tubular member 11. The first tubular member 11 is a tubular member having a longitudinal direction. In other words, the first tubular member 11 is a pipe-shaped member elongated in the positive and negative Z directions as the longitudinal direction. The length of the first tubular member 11 in the Z direction is shorter than the length of the folded document camera 100 in the Y direction. The shape of the cross section of the first tubular member 11 parallel to the XY plane is substantially elliptical, and the inside of the first tubular member 11 is hollow. The material for forming the first tubular member 11 is not particularly limited as long as it has conductivity, but a metal such as aluminum can be used, for example.

Inside the first tubular member 11, the second tubular member 12 can be housed and a wiring bundle (not shown) is arranged. The wiring bundle is a data line and a power cord that electrically connect the imaging device 50 and the base unit 30. The wire bundle has a spiral shape so as to correspond to the expansion and contraction of the expansion and contraction mechanism 10.

The first tubular member 11 has openings 13a1, 13a2, 13b1, 13b2 near both ends in the longitudinal direction. Hereinafter, the openings 13a1, 13a2, 13b1, 13b2 may be simply referred to as the openings 13. Specifically, openings 13a1 and 13a2 are provided on the outer peripheral surface of the first tubular member 11 near the end in the positive Z direction. In the cross section of the first tubular member 11 parallel to the XY plane, the opening 13a2 is arranged at a position facing the opening 13a1 in the X direction. Similarly, openings 13b1 and 13b2 are provided on the outer peripheral surface of the first tubular member 11 near the negative Z-direction end. In the cross section of the first tubular member 11 parallel to the XY plane, the opening 13b2 is arranged at a position facing the opening 13b1 in the X direction. The planar shape of the opening 13 viewed from the X direction is substantially rectangular, and the rollers 121 and 122 included in the fixing portion of the second tubular member 12 described later can be fitted therein. The opening 13 communicates with the space inside the first tubular member 11.

The second tubular member 12 is a tubular member having a longitudinal direction. In other words, the second tubular member 12 is a pipe-shaped member elongated in the Z direction as the longitudinal direction. The length of the second tubular member 12 in the Z direction is slightly shorter than the length of the first tubular member 11 in the Z direction. The shape of the cross section of the second tubular member 12 parallel to the XY plane is substantially elliptical, and the inside of the second tubular member 12 is hollow. The cross-sectional shape of the second tubular member 12 is smaller than the cross-sectional shape of the first tubular member 11 parallel to the XY plane. In other words, the dimension in the X direction in the cross-sectional shape on the outside of the second tubular member 12 is shorter than the dimension in the X direction in the cross-sectional shape on the inner side of the first tubular member 11. Similarly, the Y-direction dimension in the cross-sectional shape on the outside of the second tubular member 12 is shorter than the Y-direction dimension in the cross-sectional shape on the inner side of the first tubular member 11. Therefore, the first tubular member 11 can accommodate the second tubular member 12 inside. The shapes of the cross sections of the first tubular member 11 and the second tubular member 12 that are parallel to the XY plane are not limited to the substantially elliptical shape. The shape of the cross section may be, for example, a circle, a polygon, or the like.

The second tubular member 12 is relatively movable with respect to the first tubular member 11 along the Z direction. Therefore, the expansion/contraction mechanism 10 can be deformed into three forms: the stretched state of FIG. 3A, the contracted state described later, the process between the stretched state and the contracted state, that is, the state in the middle of the expansion/contraction operation of the expansion/contraction mechanism 10. is there. Here, the expansion/contraction operation of the expansion/contraction mechanism 10 is also referred to as the movement of the second tubular member 12 along the Z direction. The material for forming the second tubular member 12 is not particularly limited as long as it has conductivity, but for example, a metal such as aluminum can be used.

Inside the second tubular member 12, the above-described wiring bundle that electrically connects the imaging device 50 and the base unit 30 is arranged.

As described above, FIG. 3A shows the stretchable mechanism 10 in the stretched state, in which the roller 121 is fitted in the opening 13a1 and the roller 122 is fitted in the opening 13a2. As a result, the first tubular member 11 and the second tubular member 12 are stretched and fixed.

As shown in FIG. 3B, in the contracted state of the expansion/contraction mechanism 10, the second tubular member 12 is housed in the first tubular member 11. In the contracted state, the length of the expansion/contraction mechanism 10 in the Z direction is substantially equal to the length of the first tubular member 11 in the Z direction. At this time, the roller 121 is fitted in the opening 13b1 and the roller 122 is fitted in the opening 13b2. As a result, the second tubular member 12 is housed and fixed in the first tubular member 11.

As shown in FIG. 4, in the extension/contraction mechanism 10, the first tubular member 11 has the guide member 15, and the second tubular member 12 has the fixing portion 120 for the first tubular member 11. In other words, the first tubular member 11 and the second tubular member 12 are assembled via the guide member 15 and the fixing portion 120.

The guide member 15 is a tubular member having a substantially elliptical cross section parallel to the XY plane. In the cross-sectional shape of the guide member 15, the outer shape is along the inner wall of the first tubular member 11, and the inner shape is along the outer wall of the second tubular member 12. Therefore, the guide member 15 has a function of supporting the second tubular member 12. The guide member 15 makes the second tubular member 12 stable and less likely to sway with respect to the first tubular member 11.

Protrusions 16a and 16b are provided on the outer peripheral surface of the guide member 15 at positions facing each other in the X direction. Fixing holes 14a and 14b are provided at the ends of the first tubular member 11 in the positive Z direction at positions corresponding to the protrusions 16a and 16b. Therefore, when the guide member 15 is incorporated into the first tubular member 11, the protrusion 16a is fitted in the fixing hole 14a, and the protrusion 16b is fitted and fixed in the fixing hole 14b. The material for forming the guide member 15 is not particularly limited, but resin, for example, can be used.

The fixed portion 120 is incorporated inside the negative Z-direction end portion of the second tubular member 12. The fixed portion 120 includes grounding members 127 and 128, biasing members 125 and 126, rollers 121 and 122 as cushioning members, a holding member 130, and the like.

The holding member 130 is a member that serves as a base of the fixed portion 120. Grounding members 127 and 128 and biasing members 125 and 126 are attached to the holding member 130. The holding member 130 has a function of preventing the second tubular member 12 from coming off from the first tubular member 11.

The holding member 130 is a tubular member having a substantially elliptical shape in a cross section parallel to the XY plane on the negative Z direction side. The cross-sectional shape of the holding member 130 is such that the outside is along the inside of the first tubular member 11. On the positive Z direction side of the holding member 130, a flat plate-shaped portion is provided along the inner side of the second tubular member 12. Therefore, when the holding member 130 is incorporated in the second tubular member 12, the flat plate-shaped portion on the positive Z direction side is inserted into the second tubular member 12, and the negative Z direction side, that is, the cross-sectional shape. The substantially elliptical portion projects from the negative Z-direction end of the second tubular member 12.

The holding member 130 is fixed to the second tubular member 12 by a screw hole 12 a provided at the negative Z direction end of the second tubular member 12 and a screw 140. The material for forming the holding member 130 is not particularly limited, but resin can be used, for example.

Here, since the holding member 130 has a configuration that is substantially symmetrical with respect to a plane parallel to the YZ plane, the configuration on the positive X direction side will be described as an example. A biasing member 125 and a ground member 127 are attached to the holding member 130 in this order between the inner wall of the second tubular member 12 and the positive X direction.

The biasing member 125 is a spring member in which one metal rod is bent at a plurality of locations. The biasing member 125 has elasticity between a portion on the positive Z direction side and a portion on the negative Z direction side. Specifically, the biasing member 125 is angled between the positive Z-direction side portion and the negative Z-direction side portion when viewed from the Y direction. Specifically, the part on the positive Z direction side is arranged substantially parallel to the Z axis. On the other hand, the negative Z-direction side portion is arranged such that its end is lifted in the positive X-direction. Therefore, the biasing member 125 exhibits elasticity in the X direction. The material for forming the biasing member 125 is not particularly limited as long as the elasticity can be exhibited, and examples thereof include SWP-B and SUS304-WPB.

The negative Z-direction end of the urging member 125 is bent along the Y-direction, and the roller 121 incorporated in the wheel member 123 is attached thereto. Specifically, the wheel member 123 is a substantially columnar member, and has a hole formed in the center axis of the cylinder. A biasing member 125 penetrates through the hole. The diameter of the hole is slightly larger than the diameter of the biasing member 125, and the wheel member 123 can rotate while being attached to the biasing member 125.

The wheel member 123 is fitted into the roller 121. The roller 121 and the wheel member 123 are in a relationship of a tire and a wheel. Therefore, the roller 121 and the wheel member 123, while being held by the biasing member 125, can rotate about an axis substantially parallel to the Y direction as a central axis. The material for forming the wheel member 123 is not particularly limited, but resin can be used, for example. The material for forming the roller 121 is not particularly limited as long as it has rubber elasticity, but a resin can be used, for example. In this embodiment, silicone rubber is used.

The ground member 127 is a metal plate member having conductivity, and has a function of ensuring electrical connection between the second tubular member 12 and the first tubular member 11. The ground contact member 127 has a shape elongated in the Z direction and is subjected to a plurality of bending processes. The material for forming the ground member 127 is not particularly limited as long as it is a metal having conductivity, and examples thereof include stainless steel.

The ground member 127 is provided with a screw hole 127a through which the screw 140 is inserted on the positive Z direction side, and a roller opening 127b at the end in the negative Z direction. The ground member 127 is fixed to the second tubular member 12 together with the holding member 130 with the screw 140. As a result, the positive Z direction side of the ground member 127 and the inner side of the second tubular member 12 abut and are electrically connected. At this time, a portion of the biasing member 125 on the positive Z direction side is sandwiched and fixed between the ground member 127 and the holding member 130.

The roller opening 127b is an opening having a substantially rectangular shape in a plan view from the X direction, and has a size corresponding to the roller 121 and the wheel member 123. When the fixing portion 120 is assembled, the roller 121 and the wheel member 123 attached to the biasing member 125 project in the positive X direction from the roller opening 127b.

A convex portion 127c is provided at the negative Z-direction end portion of the ground member 127 by bending. The convex portion 127c has a convex shape that faces the positive X direction when viewed from the Y direction. Therefore, in the contracted state and the stretched state of the expansion/contraction mechanism 10, the convex portion 127c and the inner wall of the first tubular member 11 contact and are electrically connected.

The above-described configurations of the holding member 130 and each member on the positive X direction side are the same on the negative X direction side, except that the configuration is plane-symmetric with respect to the plane parallel to the YZ plane. .. That is, on the negative X direction side, the biasing member 126, the wheel member 124, the roller 122, and the ground contact member 128 are assembled in the same manner as on the positive X direction side. Further, the functions of the screw hole 128a, the roller opening 128b, and the convex portion 128c in the ground member 128 are similar to those of the ground member 127. Therefore, description of the configuration of the holding member 130 on the negative X direction side is omitted.

In addition, in FIG. 4, in order to describe the configuration of the extension/contraction mechanism 10, the respective components are arranged in order of the first tubular member 11, the guide member 15, the fixing portion 120, and the second tubular member 12. On the other hand, an example of a procedure for assembling the expansion/contraction mechanism 10 will be described. First, the negative Z-direction end of the second tubular member 12 is inserted into the guide member 15, and the end is projected from the negative Z-direction side of the guide member 15. Next, the fixing portion 120 is attached to the end portion of the second tubular member 12. Next, the fixed portion 120 and the second tubular member 12 are inserted into the positive Z-direction end portion of the first tubular member 11. Then, the guide member 15 is inserted into the end portion of the first tubular member 11. As a result, even if the second tubular member 12 is moved in the positive Z direction, the end portion of the guide member 15 in the negative Z direction comes into contact with the fixed portion 120. 2 The tubular member 12 does not come off.

In the present embodiment, the expansion and contraction mechanism 10 has a configuration in which two rollers 121 and 122 and the opening 13 are provided so as to face each other in the X direction, but the invention is not limited thereto. The expansion/contraction mechanism may have the above-mentioned configuration alone, or may have three or more of the above-mentioned configurations.

As shown in FIG. 5, the above-mentioned members are attached to the holding member 130, and the fixing portion 120 is assembled. On the positive X direction side of the fixed portion 120, due to the shape of the biasing member 125, the roller 121 and the wheel member 123 project in the positive X direction from the roller opening 127b of the grounding member 127. Therefore, when a force acting in the negative X direction acts on the protruding roller 121 and the wheel member 123, the elastic force of the biasing member 125 described above causes a biasing force that repels the force and moves in the positive X direction. Occur. In addition, the convex portion 127c of the ground member 127 is also arranged so as to project in the positive X direction.

On the negative X direction side of the fixed portion 120, due to the shape of the biasing member 126, the roller 122 and the wheel member 124 project in the negative X direction from the roller opening 128b of the ground member 128. Therefore, when a force in the positive X direction acts on the protruding roller 122 and the wheel member 124, the elasticity of the biasing member 126 repels the force to generate a biasing force in the negative X direction. .. Further, the convex portion 128c of the ground member 128 is also arranged so as to project in the negative X direction.

Since the number of members to be incorporated is small and the inside of the fixed portion 120 has a simple structure, it is easy to pass a wire bundle between the imaging device 50 and the base portion 30.

The operation mechanism of the extension/contraction mechanism 10 will be described with reference to FIGS. 6A and 6B. FIG. 6A is an enlarged cross-sectional view showing a locked state of the extension mechanism. FIG. 6B is an enlarged cross-sectional view showing a state in which the expanding and contracting mechanism is expanding and contracting. 6A and 6B show cross sections that are parallel to the XZ plane of the extension/contraction mechanism 10 and divide the approximately center of the extension/contraction mechanism 10. Further, in FIGS. 6A and 6B, the negative X-direction side of the extension/contraction mechanism 10 is enlarged and displayed. In FIG. 6A, the stretched state is illustrated as the locked state of the extension/contraction mechanism 10. FIG. 6B exemplifies a case where the stretching mechanism 10 shifts from the stretched state to the contracted state.

As shown in FIG. 6A, in the stretched state of the extension/contraction mechanism 10, the convex portion 128c of the ground contact member 128 and the inner wall 11a of the first tubular member 11 contact each other. At this time, the biasing member 126 and the ground member 128 are separated from each other on the negative Z direction side. Although not shown, the positive Z direction side of the ground member 128 is in contact with the second tubular member 12. Therefore, the 1st cylindrical member 11 and the 2nd cylindrical member 12 are electrically connected, and grounding is ensured.

As described above, the biasing member 126 has the positive Z direction side portion fixed to the holding member 130. Since the biasing member 126 has the elasticity described above, the biasing member 126 generates a biasing force that pushes the negative Z-direction side portion in the negative X direction. The wheel member 124 and the roller 122 are attached to the negative Z direction side of the biasing member 126. Therefore, the biasing member 126 biases the roller 122 and the wheel member 124 in the negative X direction as the first direction.

By the bias of the biasing member 126, the roller 122 is fitted into the opening 13a2 and is in the locked state. As a result, the first tubular member 11 and the second tubular member 12 are fixed. The opening 13a2 may not penetrate the inside and the outside of the first tubular member 11. For example, instead of the opening 13a2, a recessed portion that is recessed in the negative X direction may be provided, and the recessed portion may be fitted to the roller 122 to be in the locked state. The same applies to the openings 13 other than the opening 13a2.

Here, in FIG. 6A, the stretched state is shown as the locked state of the extension/contraction mechanism 10, but the basic mechanism is the same in the contracted state. That is, the roller 122 is fitted into the opening 13b2 shown in FIG. 3A to be in the locked state, and the first tubular member 11 and the second tubular member 12 are fixed.

In addition, with respect to the above description, the operations of the biasing member 125, the roller 121, the grounding member 127, and the like are similar except that the first direction is the positive X direction. Although illustration is omitted, in the stretched state of the extension/contraction mechanism 10, the convex portion 127c of the ground member 127 and the inner wall 11a of the first tubular member 11 are in contact with each other. Further, the Z direction side of the ground contact member 127 is in contact with the second tubular member 12. Therefore, the 1st cylindrical member 11 and the 2nd cylindrical member 12 are electrically connected, and grounding is ensured. The biasing member 125 biases the roller 121 in the positive X direction. Therefore, the roller 121 fits into the opening 13a1. As a result, the first tubular member 11 and the second tubular member 12 are fixed. At this time, the ground member 127 and the biasing member 125 are separated from each other on the negative Z direction side. Further, the basic mechanism is the same when the expansion mechanism 10 is in the contracted state.

As shown in FIG. 6B, during the expansion and contraction operation of the expansion and contraction mechanism 10 in the expansion and contraction mechanism 10, in other words, when the second tubular member 12 moves in the Z direction, the fitting between the roller 122 and the opening 13a2 is released. To be done. Specifically, when a force that can release the fitting between the roller 122 and the opening 13a2 is applied to the second tubular member 12 in the negative Z direction, the roller 122 is disengaged from the opening 13a2, and The two tubular members 12 become movable. Then, in response to the expansion/contraction mechanism 10 shifting from the stretched state to the contracted state, the roller 122 and the wheel member 124 rotate while contacting the inner wall 11 a of the first tubular member 11.

Due to the contact between the inner wall 11a of the first tubular member 11 and the roller 122, the portion of the biasing member 126 on the negative Z direction side moves in the second direction opposite to the first direction, that is, in the positive X direction. Be energized. Therefore, on the negative Z direction side, the biasing member 126 and the ground contact member 128 contact each other, and the ground contact member 128 is biased in the positive X direction. Thereby, the convex portion 128c of the ground member 128 and the inner wall 11a of the first tubular member 11 are separated from each other. As described above, during the expansion and contraction operation of the expansion and contraction mechanism 10, in other words, in the state other than the contracted state and the stretched state of the expansion and contraction mechanism 10, the first tubular member 11 and the ground member 128 are separated from each other. This prevents wear of the first tubular member 11 and the ground member 128.

Here, the cushioning member is not limited to the roller 122, but may be rotated like the roller 122 and the wheel member 124 as long as the cushioning member fits in the roller opening 127b and can slide while contacting the inner wall 11a. It does not have to be possible. As such a cushioning member, for example, a resin having a low frictional property such as tetrafluoroethylene can be cited, but it is more preferable to use the roller 122 and the wheel member 124 from the viewpoint of a smooth expansion/contraction operation in the expansion/contraction mechanism 10. .. Although the ground is released during the expansion/contraction operation of the expansion/contraction mechanism 10, the document camera 100 is not used.

Here, in FIG. 6B, the case where the expansion and contraction mechanism 10 shifts from the stretched state to the contracted state has been illustrated. is there. Therefore, the description of the case where the telescopic mechanism 10 shifts from the contracted state to the stretched state is omitted.

With respect to the above description, the operations of the biasing member 125, the roller 121, the ground contact member 127, and the like are the same except that the first direction is the positive X direction and the second direction is the negative X direction. Although illustration is omitted, during the expansion/contraction operation of the expansion/contraction mechanism 10, the fitting between the roller 121 and the opening 13a1 is released. Then, the roller 121 and the wheel member 123 rotate while contacting the inner wall 11a of the first tubular member 11. By the contact between the first tubular member 11 and the roller 121, the portion of the biasing member 125 on the negative Z direction side is biased in the negative X direction as the second direction. Therefore, on the negative Z direction side, the biasing member 125 and the ground contact member 127 contact each other, and the ground contact member 127 is biased in the negative X direction. As a result, the protrusion 127c of the ground member 127 and the inner wall 11a of the first tubular member 11 are separated from each other.

As described above, according to the expansion/contraction mechanism 10 and the document camera 100 according to the present embodiment, the following effects can be obtained.

Wear of the first tubular member 11 and the ground members 127, 128 can be prevented. Specifically, in the contracted state and the stretched state of the expansion/contraction mechanism 10, the first cylindrical member 11 and the grounding members 127 and 128 contact each other to ensure grounding. On the other hand, when the second tubular member 12 moves in the Z direction, in other words, during the extension/contraction operation of the extension/contraction mechanism 10, the first tubular member 11 and the ground members 127, 128 are separated from each other. Therefore, the first tubular member 11 and the grounding members 127 and 128 do not slide, and wear of the first tubular member 11 and the grounding members 127 and 128 is prevented. That is, it is possible to provide the expansion and contraction mechanism 10 that prevents the wear of the first tubular member 11 and the ground members 127 and 128.

The ground member 128 is biased in the positive X direction only during the expansion/contraction operation of the expansion/contraction mechanism 10. On the other hand, the ground contact member 128 contacts the first tubular member 11 without being biased by the biasing member 126 in the contracted state and the stretched state. Therefore, the grounding member 128 is biased only during the above-mentioned expansion/contraction operation, so that the time for which it is biased is reduced as compared with the case where it is biased in the contracted state and the stretched state.

Further, in the contracted state and the stretched state, the urging force of the urging member 126 can be reduced as compared with the case where the ground member 128 is urged to come into contact with the first tubular member 11. Specifically, the biasing member 126 biases the roller 122 in the negative X direction. Therefore, the biasing member 126 does not play a role of biasing the ground contact member 128 in the negative X direction to bring it into contact with the first tubular member 11. As a result, it is possible to suppress the deformation of the ground member 128 and the biasing member 126, and the occurrence of poor contact between the ground member 128 and the first tubular member 11.

The ground contact member 127 is biased in the negative X direction only when the second tubular member 12 moves in the Z direction, that is, during the expansion and contraction operation of the expansion and contraction mechanism 10. On the other hand, the ground contact member 127 abuts the first tubular member 11 without being biased by the biasing member 125 in the contracted state and the stretched state. Therefore, the grounding member 127 is biased only during the expansion and contraction operation, so that the time for which it is biased is reduced as compared with the case where it is biased in the contracted state and the stretched state.

Further, in the contracted state and the stretched state, the urging force of the urging member 125 can be reduced as compared with the case where the ground member 127 is urged to come into contact with the first tubular member 11. Specifically, the biasing member 125 biases the roller 121 in the positive X direction. Therefore, the urging member 125 does not play a role of urging the ground member 127 in the positive X direction to bring it into contact with the first tubular member 11. As a result, it is possible to suppress the deformation of the ground member 127 and the biasing member 125 and the occurrence of poor contact between the ground member 127 and the first tubular member 11.

When the second tubular member 12 moves in the Z direction, the rollers 121 and 122 rotate while contacting the first tubular member 11. Therefore, the wear of the rollers 121 and 122 can be reduced as compared with the case where the first cylindrical member 11 is simply brought into contact with and slides. Further, since the rollers 121 and 122 rotate without sliding during the above-described movement, the expansion/contraction operation of the expansion/contraction mechanism 10 is smoothly performed, and the operation feeling of the expansion/contraction operation can be improved.

The expansion/contraction mechanism 10 has a pair of rollers 121, 122, an opening 13, and the like facing each other in the X direction. Therefore, in addition to the smooth expansion/contraction operation, the fixing force between the first tubular member 11 and the second tubular member 12 can be increased.

Since the generation of abrasion powder originating from the expansion/contraction mechanism 10 is suppressed, it is possible to provide the document camera 100 in which the occurrence of a short circuit in the live part is prevented and the appearance quality is improved. Further, the expansion/contraction mechanism 10 can extend or contract the distance between the imaging device 50 and the base unit 30. Specifically, the distance between the imaging device 50 and the base portion 30 is set to the length of the first tubular member 11 in the Z direction and the length obtained by adding the length of the second tubular member 12 in the Z direction to the length. It can be adjusted in two ways. That is, the distance between the imaging device 50 and the imaging target can be set in two steps.

2. Second Embodiment In the present embodiment, a telescopic mechanism included in a document camera as an example of an electronic device will be described as an example.

2.1. Telescopic Mechanism Hereinafter, the mechanism of operation of the telescopic mechanism of the present embodiment will be described with reference to FIGS. 7A, 7B, and 8. FIG. 7A is an enlarged cross-sectional view showing a locked state of the expansion/contraction mechanism of the document camera according to the second embodiment. FIG. 7B is an enlarged cross-sectional view showing a state during expansion/contraction operation of the expansion/contraction mechanism. FIG. 8 is a cross-sectional view showing a stretched state of the expansion/contraction mechanism. In the following description, the same components as those in the first embodiment will be designated by the same reference numerals, and redundant description will be omitted.

Here, FIGS. 7A and 7B show a cross section that is parallel to the XZ plane of the expansion/contraction mechanism and divides the substantially center of the expansion/contraction mechanism. Further, in FIGS. 7A and 7B, the negative X-direction side of the expansion/contraction mechanism is enlarged and displayed. In FIG. 7A, a stretched state is illustrated as the locked state of the extension mechanism. FIG. 7B illustrates a case where the stretching mechanism shifts from the stretched state to the contracted state.

The expansion/contraction mechanism of the present embodiment is an expansion/contraction mechanism for a document camera, and includes a first tubular member 311 and a second tubular member 312, as shown in FIG. 7A. The first tubular member 311 has a longitudinal direction. In other words, the first tubular member 311 is elongated in the positive and negative Z directions. The second tubular member 312 is accommodated in the first tubular member 311 in the contracted state and protrudes from the first tubular member 311 in the stretched state in the extension mechanism, and extends along the positive and negative Z directions as the longitudinal direction. , And is movable relative to the first tubular member 311. The second tubular member 312 has an opening 313a2.

The first tubular member 311 has a fixing portion (not shown) for the second tubular member 312. The fixed portion includes a ground member 328, a biasing member 326, and a roller 122 and a wheel member 124 attached to the biasing member 326. The biasing member 326 biases the roller 122 in the positive X direction as the second direction.

In the stretched state of the expansion/contraction mechanism, the roller 122 is fitted into the opening 313a2, the first tubular member 311 and the second tubular member 312 are fixed, and the expansion/contraction mechanism is locked. At this time, the ground member 328 and the urging member 326 are separated from each other, and the ground member 328 and the outer surface 312a of the second tubular member 312 contact each other. Although not shown, the ground member 328 is electrically connected to the first tubular member 311. Therefore, the first tubular member 311 and the second tubular member 312 are electrically connected to each other via the grounding member 328 to ensure the grounding.

Specifically, the biasing member 326 is fixed to the first tubular member 311 at a portion on the negative Z direction side. Since the biasing member 326 has elasticity, the biasing member 326 generates a biasing force that pushes the portion on the positive Z direction side in the positive X direction. The wheel member 124 and the roller 122 are attached to the positive Z direction side of the biasing member 326. Therefore, the biasing member 326 biases the roller 122 and the wheel member 124 in the positive X direction as the second direction. The roller 122 is fitted into the opening 313a2 by the urging force of the urging member 326 to be in a locked state. As a result, the first tubular member 311 and the second tubular member 312 are fixed.

Here, in FIG. 7A, the stretched state is shown as the locked state of the expansion and contraction mechanism, but the basic mechanism is the same in the contracted state. That is, although illustration is omitted, the roller 122 fits into the opening portion of the positive Z-direction end portion of the second tubular member 312 to be in the locked state, and the first tubular member 311 and the second tubular member 312 are Is fixed.

As shown in FIG. 7B, during the movement between the contracted state and the stretched state in the positive and negative Z directions along the longitudinal direction of the second tubular member 312, the roller 122 and the opening 313a2 are moved. The fitting is released. Then, the roller 122 and the wheel member 124 rotate while abutting on the outer surface 312a of the second tubular member 312 in response to the expansion mechanism contracting state contracting state.

Due to the contact between the outer surface 312a of the second tubular member 312 and the roller 122, the portion of the biasing member 326 on the positive Z direction side is the negative X direction as the first direction, which is the opposite direction to the second direction. Is urged to. Therefore, the urging member 326 and the ground member 328 come into contact with each other, and the ground member 328 and the second tubular member 312 are separated from each other. As described above, during the extension/contraction operation of the extension/contraction mechanism, in other words, in the state other than the contracted state and the stretched state of the extension/contraction mechanism, the second tubular member 312 and the ground member 328 are separated from each other. This prevents wear of the second tubular member 312 and the ground member 328.

Here, in FIG. 7B, the case where the expansion and contraction mechanism shifts from the stretched state to the contracted state has been illustrated, but also when transitioning from the contracted state to the stretched state, the roller 122 is reversely rotated, and the same as above. .. Therefore, the description of the case where the stretching mechanism shifts from the contracted state to the stretched state is omitted.

As shown in FIG. 8, the fixing portion in the expansion/contraction mechanism of the present embodiment has the same structure as the above-mentioned ground member 328, biasing member 326, and the like on the positive X direction side. Specifically, the fixed portion has a biasing member 325, and a roller 121 and a wheel member 123 attached to the biasing member 325 on the positive X direction side. The biasing member 325 biases the roller 121 in the negative X direction. In the stretched state of the expansion/contraction mechanism, the roller 121 fits into the opening 313a1 of the second tubular member 312.

Functions of the biasing member 325, the ground member 327, and the like on the positive X direction side of the fixed portion are the same as those of the bias member 326, the ground member 328, and the like on the negative X direction side of the fixed portion described above. Is omitted.

A space for arranging a wiring bundle including a data line and a power cord, which electrically connects the imaging device 50 and the base unit 30, is secured inside the second tubular member 312.

As described above, according to the expansion/contraction mechanism of this embodiment, the same effect as that of the first embodiment can be obtained.

3. Modified Example An operation mechanism of the expansion mechanism according to the modified example will be described with reference to FIGS. 9A and 9B. FIG. 9A is an enlarged cross-sectional view showing a locked state of the extension mechanism according to the modified example. FIG. 9B is an enlarged cross-sectional view showing a state in which the expanding and contracting mechanism is expanding and contracting. The extension/contraction mechanism 20 of the present modification is different from the extension/contraction mechanism 10 of the first embodiment in the configurations of the grounding member and the biasing member. Therefore, the same components as those in the first embodiment will be denoted by the same reference numerals, and redundant description will be omitted.

9A and 9B show a cross section that is parallel to the XZ plane of the expansion/contraction mechanism 20 and divides the approximate center of the expansion/contraction mechanism 20. Further, in FIGS. 9A and 9B, the negative X-direction side of the extension/contraction mechanism 20 is enlarged and displayed. In FIG. 9A, the stretched state is illustrated as the locked state of the extension mechanism 20. FIG. 9B illustrates a case where the stretching mechanism 20 shifts from the stretched state to the contracted state.

As shown in FIG. 9A, in the stretched state of the extension/contraction mechanism 20, the ground contact member 228 and the negative Z-direction side end of the biasing member 226 contact each other. As a result, the ground member 228 is biased in the negative X direction and comes into contact with the inner wall 11a of the first tubular member 11. In the above embodiment, the ground contact member 128 is in contact with the inner wall 11a regardless of the urging of the urging member 126. On the other hand, the grounding member 228 of the expansion/contraction mechanism 20 is separated from the inner wall 11a in the unbiased state, which is different from the above embodiment.

Specifically, the biasing member 226 is fixed to the holding member 130 at a portion on the positive Z direction side. Since the biasing member 226 has elasticity, the biasing member 226 generates a biasing force that pushes the portion on the negative Z direction side in the negative X direction. The wheel member 124 and the roller 122 are attached to the negative Z direction side of the biasing member 226, and the edge of the roller opening (not shown) is arranged. Therefore, the biasing member 226 biases the roller 122, the wheel member 124, and the ground contact member 228 in the negative X direction as the first direction.

The urging of the urging member 226 causes the convex portion 228c of the ground contact member 228 and the inner wall 11a of the first tubular member 11 to come into contact with each other. Although not shown, the positive Z-direction side of the ground member 228 is in contact with the second tubular member 12. Therefore, the 1st cylindrical member 11 and the 2nd cylindrical member 12 are electrically connected, and grounding is ensured. Further, the roller 122 is fitted into the opening 13a2 by the urging force of the urging member 226 to be in the locked state. As a result, the first tubular member 11 and the second tubular member 12 are fixed.

Here, in FIG. 9A, the stretched state is shown as the locked state of the extension/contraction mechanism 20, but the basic mechanism is the same in the contracted state. That is, the roller 122 is fitted into the opening 13b2 and is in a locked state, and the first tubular member 11 and the second tubular member 12 are fixed. The basic mechanism is the same in the contracted state of the expansion/contraction mechanism 20.

As shown in FIG. 9B, during the expansion/contraction operation of the expansion/contraction mechanism 20 in the expansion/contraction mechanism 20, in other words, when the second tubular member 12 moves in the Z direction, the fitting between the roller 122 and the opening 13a2 is released. To be done. Then, in response to the expansion/contraction mechanism 20 shifting from the stretched state to the contracted state, the roller 122 and the wheel member 124 rotate while contacting the inner wall 11 a of the first tubular member 11.

By the contact between the inner wall 11a of the first tubular member 11 and the roller 122, the portion of the biasing member 226 on the negative Z direction side is biased in the positive X direction as the second direction. Therefore, the biasing member 226 and the ground member 228 are separated from each other, and the bias of the biasing member 226 with respect to the ground member 228 is released. As a result, the convex portion 228c of the ground contact member 228 and the inner wall 11a of the first tubular member 11 are separated from each other. As described above, during the expansion and contraction operation of the expansion and contraction mechanism 20, in other words, in the state other than the contracted state and the stretched state of the expansion and contraction mechanism 20, the first tubular member 11 and the ground member 228 are separated from each other. This prevents wear of the first tubular member 11 and the ground member 228.

Here, in FIG. 9B, the case where the expansion and contraction mechanism 20 shifts from the stretched state to the contracted state has been illustrated. is there. Therefore, the description of the case where the telescopic mechanism 20 shifts from the contracted state to the stretched state is omitted. In addition, the positive X direction side of the extension/contraction mechanism 20 has the same configuration.

As described above, according to the expansion/contraction mechanism 20 according to the present modification, the following effects can be obtained in addition to the effects of the first embodiment.

In the contracted state and the stretched state, the grounding member 228 is biased in the negative X direction by the biasing member 226 and comes into contact with the first tubular member 11. In other words, the contact between the ground member 228 and the first tubular member 11 depends on the urging force of the urging member 226. Therefore, by setting the biasing force of the biasing member 226 in the negative X direction to be large, it is possible to suppress the occurrence of poor contact between the ground member 228 and the first tubular member 11. Further, since the negative Z-direction end of the biasing member 226 is arranged on the positive X-direction side of the ground member 228, assembly is facilitated and the space for the wiring bundle is increased. You can

The contents derived from the embodiment will be described below.

The expansion/contraction mechanism is an expansion/contraction mechanism for electronic devices, and includes a first tubular member having a longitudinal direction and a first tubular member that is accommodated in the first tubular member in the contracted state and in the extended state from the first tubular member. A second tubular member protruding along the longitudinal direction, the second tubular member having a fixing portion for the first tubular member, and the fixing portion having a ground member and a biasing member. And a cushioning member attached to the biasing member. The biasing member biases the cushioning member in the first direction, and in the contracted state and the stretched state, the ground member and the first tubular member. Abutting against each other and moving the second tubular member along the longitudinal direction in the process between the contracted state and the stretched state, the first tubular member and the cushioning member come into contact with each other so that the urging member moves to the first position. The ground contact member and the first tubular member are separated from each other by being urged in the second direction opposite to the direction.

With this configuration, it is possible to prevent wear of the first tubular member and the ground member. Specifically, in the contracted state and the stretched state of the expansion and contraction mechanism, the first tubular member and the grounding member contact each other to secure the grounding. On the other hand, during the movement of the second tubular member along the longitudinal direction, in other words, during the telescopic operation of the telescopic mechanism, the first tubular member and the ground member are separated from each other. Therefore, the first tubular member and the ground contact member do not slide, and wear of the first tubular member and the ground contact member is prevented. That is, it is possible to provide an expansion/contraction mechanism that prevents abrasion of the first tubular member and the ground member.

In the expansion and contraction mechanism described above, in the contracted state and the stretched state, the ground member and the urging member are separated from each other, and when the second tubular member moves along the longitudinal direction, the ground member and the urging member come into contact with each other, It is preferable that the ground member is biased in the second direction.

According to this configuration, the ground contact member is biased in the second direction only when the second tubular member moves in the longitudinal direction, that is, during the expansion and contraction operation of the expansion and contraction mechanism. On the other hand, in the contracted state and the stretched state, the ground contact member contacts the first tubular member without being biased by the biasing member. Therefore, the grounding member is biased only during the expansion and contraction operation, so that the time for which it is biased is reduced as compared with the case where it is biased in the contracted state and the stretched state.

Further, in the contracted state and the stretched state, the urging force of the urging member in the first direction is greater than that in the case where the ground member is urged in the first direction by the urging member and comes into contact with the first tubular member. It can be reduced. Specifically, the biasing member does not serve to bias the cushioning member in the first direction and bias the ground contact member in the first direction to contact the first tubular member. Accordingly, it is possible to suppress the deformation of the ground member and the biasing member and the occurrence of poor contact between the ground member and the first tubular member.

In the above-described expansion/contraction mechanism, in the contracted state and the stretched state, the ground member and the urging member are in contact with each other, the ground member is urged in the first direction, and when the second tubular member moves in the longitudinal direction, It is preferable that the biasing member and the ground member are separated from each other.

According to this configuration, in the contracted state and the stretched state, the ground member is biased in the first direction by the biasing member and comes into contact with the first tubular member. In other words, the contact between the grounding member and the first tubular member depends on the urging force of the urging member. Therefore, by setting the biasing force of the biasing member in the first direction to be large, it is possible to suppress the occurrence of poor contact between the ground contact member and the first tubular member.

In the above-described expansion/contraction mechanism, the first tubular member has an opening, the cushioning member is a roller, and when the second tubular member moves in the longitudinal direction, the roller causes the inner wall of the first tubular member to move. In the contracted state and the stretched state, the roller fits into the opening and the first tubular member and the second tubular member are fixed to each other.

According to this configuration, when the second tubular member moves in the longitudinal direction, the roller rotates while contacting the first tubular member. Therefore, wear of the cushioning member can be reduced as compared with the case where the cushioning member simply abuts on the first tubular member and slides. Further, since the roller rotates without sliding during the above-described movement, the expansion/contraction operation of the expansion/contraction mechanism is smoothly performed, and the operation feeling of the expansion/contraction operation can be improved.

The expansion/contraction mechanism is an expansion/contraction mechanism for electronic devices, and includes a first tubular member having a longitudinal direction and a first tubular member that is accommodated in the first tubular member in the contracted state and in the extended state from the first tubular member. A second tubular member having an opening and projecting and movable along the longitudinal direction; the first tubular member has a fixing portion for the second tubular member, and the fixing portion is grounded. A biasing member, and a roller attached to the biasing member. The biasing member biases the roller in the second direction, and in the contracted state and the stretched state, the grounding member and the biasing member. Are separated from each other, the grounding member and the second tubular member come into contact with each other, the roller is fitted into the opening portion, the first tubular member and the second tubular member are fixed, and the contracted state and the stretched state. When the second tubular member moves along the longitudinal direction in the process between the state and the state, the roller rotates while abutting on the second tubular member, and the second tubular member and the roller abut each other. The biasing member is biased in the first direction opposite to the second direction, the grounding member and the biasing member come into contact with each other, and the grounding member and the second tubular member are separated from each other.

With this configuration, it is possible to prevent wear of the second tubular member and the ground member. More specifically, in the contracted state and the stretched state of the expansion/contraction mechanism, the second tubular member and the ground member come into contact with each other to ensure grounding. On the other hand, during the movement of the second tubular member along the longitudinal direction, in other words, during the extension/contraction operation of the extension/contraction mechanism, the second tubular member and the ground member are separated from each other. Therefore, the second tubular member and the grounding member do not slide, and wear of the second tubular member and the grounding member is prevented. That is, it is possible to provide an expansion/contraction mechanism that prevents wear of the second tubular member and the ground contact member.

The ground contact member is biased in the first direction only when the second tubular member moves in the longitudinal direction, that is, during the expansion and contraction operation of the expansion and contraction mechanism. On the other hand, in the contracted state and the stretched state, the ground contact member contacts the second tubular member without being biased by the biasing member. Therefore, since the grounding member is biased only during the expansion and contraction operation, the time for which it is biased is reduced compared to when it is biased in the contracted state and the stretched state.

Further, in the contracted state and the stretched state, the urging force of the urging member in the second direction is greater than that in the case where the grounding member is urged in the second direction by the urging member and comes into contact with the second tubular member. It can be reduced. Specifically, the biasing member does not serve to bias the roller in the second direction and bias the ground contact member in the second direction to contact the second tubular member. Accordingly, it is possible to suppress the deformation of the ground member and the biasing member and the occurrence of poor contact between the ground member and the second tubular member.

When the second tubular member moves in the longitudinal direction, the roller rotates while contacting the second tubular member. Therefore, the roller is a buffer member that does not rotate, and wear of the roller can be reduced as compared with a case where the roller simply abuts and slides on the second tubular member. Further, since the roller rotates without sliding during the above-described movement, the expansion/contraction operation of the expansion/contraction mechanism is smoothly performed, and the operation feeling of the expansion/contraction operation can be improved.

An electronic device includes the above-described expansion/contraction mechanism, an imaging device attached to the second tubular member, and a base portion attached to the first tubular member.

According to this configuration, since the generation of abrasion powder originating from the expansion mechanism is suppressed, it is possible to prevent the occurrence of a short circuit in the live part and to provide an electronic device with improved appearance quality. Moreover, the distance between the image pickup device and the base portion can be extended or contracted by the extension mechanism. Specifically, the distance between the imaging device and the base portion is adjusted in two ways: the length of the first tubular member in the longitudinal direction and the length of the second tubular member added in the longitudinal direction. You can

10, 20... Stretching mechanism, 11, 311... First tubular member, 11a... Inner wall, 12, 312... Second tubular member, 13, 13a1, 13a2, 13b1, 13b2, 313a1, 313a2... Opening portion, 30... Base part, 50... Imaging device, 100... Document camera, 120... Fixed part, 121, 122... Roller, 125, 126, 226, 325, 326... Energizing member 127, 128, 228, 327, 328... Grounding member ..

Claims (6)

A telescopic mechanism for electronic devices,
A first tubular member having a longitudinal direction;
A second tubular member housed in the first tubular member in the contracted state and projecting from the first tubular member in the stretched state, the second tubular member movable in the longitudinal direction,
The second tubular member has a fixing portion for the first tubular member,
The fixing portion includes a ground member, a biasing member, and a cushioning member attached to the biasing member,
The biasing member biases the buffer member in the first direction,
In the contracted state and the stretched state, the ground contact member and the first tubular member are in contact with each other,
During the process between the contracted state and the stretched state, when the second tubular member moves along the longitudinal direction, the first tubular member and the cushioning member come into contact with each other, so that the biasing member is contacted. The elastic mechanism is urged in a second direction opposite to the first direction to separate the ground member from the first tubular member. In the contracted state and the stretched state, the ground member and the biasing member are separated from each other,
The said grounding member and the said biasing member contact|abut and the said grounding member is biased in the said 2nd direction at the time of the movement of the said 2nd cylindrical member along the said longitudinal direction. Telescopic mechanism. In the contracted state and the stretched state, the ground contact member and the biasing member are in contact with each other, and the ground contact member is biased in the first direction,
The expansion/contraction mechanism according to claim 1, wherein the biasing member and the ground member are separated from each other when the second tubular member moves along the longitudinal direction. The first tubular member has an opening,
The cushioning member is a roller,
When the second tubular member moves along the longitudinal direction, the roller rotates while contacting the inner wall of the first tubular member,
The roller is fitted into the opening to fix the first tubular member and the second tubular member to each other in the contracted state and the stretched state. The expansion mechanism according to item 1. A telescopic mechanism for electronic devices,
A first tubular member having a longitudinal direction;
A second tubular member having an opening, which is housed in the first tubular member in the contracted state and protrudes from the first tubular member in the stretched state, and which is movable along the longitudinal direction in the stretchable mechanism. And
The first tubular member has a fixing portion for the second tubular member,
The fixed portion includes a ground member, a biasing member, and a roller attached to the biasing member,
The biasing member biases the roller in a second direction,
In the contracted state and the stretched state, the ground member and the urging member are separated from each other, the ground member and the second tubular member are in contact with each other, and the roller is fitted into the opening. , The first tubular member and the second tubular member are fixed,
When the second tubular member moves along the longitudinal direction in the process between the contracted state and the stretched state, the roller rotates while contacting the second tubular member, By the contact between the tubular member and the roller, the urging member is urged in the first direction opposite to the second direction, and the grounding member and the urging member come into contact with each other. An expansion/contraction mechanism in which the ground contact member and the second tubular member are separated from each other. An expansion/contraction mechanism according to any one of claims 1 to 5, an imaging device attached to the second tubular member, and a base portion provided with the first tubular member. Electronics.

Images