JP2010014185A - Rotary shaft and head-mounted display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hinge part capable of holding a pivotally supported object at an optional angle, and capable of adjusting an operational feeling, in a head-mounted display device or the like having a display device body having a display part and a support part for rotatably supporting this display device body by a helmet. <P>SOLUTION: This rotary shaft 3 has a shaft body 41 for filling a noncompressive pressure medium inside and capable of changing a diameter by elastic deformation when pressure received from the pressure medium is changed, a pressurizing member 42 for transmitting pressure to the pressure medium by pressing the pressure medium in this shaft body 41, and an operation part 43 for accepting operation force for advancing-retreating the pressurizing member for changing the pressure transmitted to the pressure medium from this pressurizing member 42, and is inserted into a bearing hole 22a in a state of contacting at least partially. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotary shaft having a configuration for rotatably supporting a support object and holding the support object at an arbitrary angle, and a head-mounted display device using such a rotation shaft. .

Conventionally, as a configuration for rotatably supporting a support object using a rotation shaft and holding the support object at an arbitrary angle, for example, a metal rotation shaft is press-fitted into a resin bearing, A configuration in which the bearing is elastically deformed and the rotating shaft is frictionally held by an elastic force is considered (for example, see Patent Document 1 and Non-Patent Document 1).
JP 2007-336166 A Accurate Inc., “Product Information Accurate Inc.” [online], 2004, Accurate Inc., [Search July 3, 2008], Internet <URL: http://accurate.jp/product/hinge /Hexatorq/Hexatorq.htm>

  However, since the elastic deformation region of the resin is small, high processing accuracy is required for the rotating shaft and the bearing hole. In addition, since the linear expansion coefficients of the resin and the metal differ by several times, the friction between the rotating shaft and the bearing hole changes depending on the ambient temperature, and the operational feeling changes. Furthermore, there is a desire to change the magnitude of friction between the rotating shaft and the bearing hole for each user so that each user can obtain a desired operational feeling. In the configuration described in Patent Literature 1, since there is no means for changing the frictional force between the rotating shaft and the bearing hole, such a demand cannot be met.

  The object of the present invention is to solve the problems described above.

  That is, in order to achieve the above object, the rotating shaft according to the present invention includes a shaft main body that is filled with a pressure medium and whose diameter can be changed by elastic deformation when the pressure received from the pressure medium changes, Pressure transmitting means for transmitting pressure to the pressure medium in the shaft main body.

  If this is the case, at least a part of the bearing is in contact with the bearing and is inserted into the bearing hole, and pressure is transmitted to the pressure medium in the shaft body by the pressure transmission means, and the transmitted pressure is transmitted from the pressure medium. By further transmitting to the outer periphery of the shaft main body to elastically deform the shaft main body and changing the diameter of the shaft main body, the frictional force between the shaft main body and the bearing hole can be changed. That is, when the pressure is transmitted to the small area portion of the pressure medium by the pressure transmitting means, the same pressure as the pressure received by the small area portion is evenly applied to the pressure medium by utilizing the Pascal principle. When the area of the area portion is A and the area of the cylindrical surface of the shaft body is B, the cylindrical surface of the shaft body receives a pressing force amplified to B / A times the force received by the small area portion. By using this, it is possible to create a sufficiently large pressure to change the diameter of the shaft main body with a small operating force, and to easily change the frictional force between the shaft main body and the bearing hole. In the present invention, the “pressure transmission means” means a pressure member that presses the pressure medium in the shaft body and transmits the pressure to the pressure medium, an internal space of the shaft body, and an external pressure medium supply source. The pressure can be transmitted to the pressure medium, such as a combination of pressure adjusting elements such as a communication path for communicating the pressure medium and a pressure regulator for adjusting the pressure of the pressure medium supplied to the internal space of the shaft body through the communication path. This is a concept showing all means capable of changing the pressure transmitted by the medium.

  In order to solve the above problems, in order to easily change the diameter of the shaft main body, the pressure transmitting means presses the pressure medium in the shaft main body and transmits the pressure to the pressure medium. It is desirable to include a pressure member and an operation unit that receives an operation force for moving the pressure member forward and backward to change the pressure transmitted from the pressure member to the pressure medium. If this is the case, the force that presses the pressure medium in the shaft body by the pressure member having a small surface area is amplified using the Pascal principle as described above, and further transmitted to the outer periphery of the shaft body. This is because a sufficiently large pressure can be generated to change the diameter of the shaft body with a small operating force. In addition, as long as the pressurizing member is arranged in a space provided in communication with the space in the shaft main body, the pressurizing member and the operation unit may be provided in a position separated from the shaft main body in the radial direction.

  In order to solve the above problems, in order to facilitate the advancement / retraction operation of the pressurizing member and to hold the pressurizing member at an arbitrary position, the operation unit has the pressurizing member at the tip end. It is desirable to have a male screw member that is connected to and a female screw member that can be screwed into the male screw member. With such a configuration, the male screw member and the female screw member are screwed together, and the male screw member is rotated to advance and retract with respect to the female screw member, whereby the pressure member connected to the tip of the male screw member is This is because force can be used to advance and retract simultaneously, and the pressing member can be advanced and retracted with a smaller operating force.

  In order to transmit the pressure uniformly over the entire side surface of the shaft body while reducing the advance / retreat width of the pressure member, it is desirable that the pressure medium is a liquid.

  Furthermore, in order to be able to change the diameter of the shaft body by a smaller pressure change, it is desirable that the shaft body is made of resin.

  On the other hand, as a preferred embodiment of such a rotating shaft, a display device main body having a display unit, and a support unit that rotatably supports the display device main body on a helmet, the support unit Comprises a bearing hole and a rotating shaft that is inserted in a state in which at least a part of the bearing hole is in contact with the bearing hole. The rotating shaft fills the pressure medium therein and receives pressure from the pressure medium. A head-mounted display device comprising: a shaft main body whose diameter can be changed by elastic deformation when changed, and a pressure transmission means for transmitting pressure to a pressure medium in the shaft main body.

  In the present invention, the “rotary shaft” is not only a shaft that is inserted into the bearing and rotatable about the axis, but is also inserted into the bearing hole of the supporting object having the bearing hole. It is a concept that also includes a member that supports the shaft center so as to be rotatable.

  By using the rotating shaft according to the present invention, the pressure is transmitted to the small area of the pressure medium by the pressure transmitting means, thereby transmitting the pressure to the outer periphery of the shaft main body and elastically deforming the shaft main body to Since the diameter can be changed, high machining accuracy is not necessarily required when forming the shaft body and the bearing hole. That is, when the pressure is transmitted to the small area portion of the pressure medium by the pressure transmitting means, the same pressure as the pressure received by the small area portion is evenly applied to the pressure medium by utilizing the Pascal principle. When the area of the area portion is A and the area of the cylindrical surface of the shaft body is B, the cylindrical surface of the shaft body receives a pressing force amplified to B / A times the force received by the small area portion. By using this, it is possible to create a sufficiently large pressure to change the diameter of the shaft main body with a small operating force, and to easily change the frictional force between the shaft main body and the bearing hole. In addition, by changing the diameter of the shaft body, the friction force between the shaft body and the bearing hole is changed, and the friction between the rotating shaft and the bearing hole is kept constant regardless of the ambient temperature, It is possible to respond to the desire to change the magnitude of the friction between the rotating shaft and the bearing hole for each user so as to obtain a desired operational feeling for each user.

  Hereinafter, an embodiment of the present invention will be described.

  As shown in FIG. 1, the head-mounted display device 1 according to this embodiment includes a display device body 2 and a support unit 3 that rotatably supports the display device body 2 on a helmet H.

  The display device body 2 has a conventionally well-known configuration for use in this type of head-mounted display device. That is, a display unit 21 having a display and an optical system (not shown) inside, a base unit 22 for connecting the display unit 21 and the support unit 3, and connecting the base unit 22 and the display unit 21 together. And a connecting portion 23 formed using a ball joint (not shown).

  On the other hand, the support portion 3 includes a clip 5 that can hold the heel portion of the helmet H, and a rotating shaft 4 that supports the clip 5 and the base unit 22 of the display device body 2 so as to be relatively rotatable. The rotating shaft 4 extends in the width direction of the head-mounted display device 1, and a sectional view including the axis center of the support portion 3 fills the internal space 41s with water as a pressure medium, as shown in FIG. A shaft main body 41 whose diameter can be changed by elastic deformation, a pressurizing member 42 for applying pressure by pressing water in the shaft main body 41 to transmit pressure to the internal space 41s of the shaft main body 41, and An operation unit 43 that receives an operation force for moving the pressing member 42 forward and backward is provided. The pressurizing member 42 and the operation unit 43 are housed in a case 44 formed integrally with the shaft body 41. The internal space of the case 44 communicates with the internal space of the shaft main body 41. The rotating shaft 4 is attached to the clip 5 so as not to rotate, and is inserted into a bearing hole 22 a provided in the base unit 22. This rotating shaft 4 is the rotating shaft of the present invention.

  Specifically, the shaft body 41 is a hollow cylindrical member filled with water in the internal space 41s. The shaft body 41 is made of resin, and the diameter of the cylindrical surface portion is changed by receiving water pressure from the internal space 41s.

  The pressure member 42 is a stopper that is in contact with water filled in the internal space 41 s of the shaft body 41 without a gap. Further, an O-ring 42a is disposed on the peripheral wall of the pressure member 42 in order to prevent liquid leakage.

  The operating portion 43 includes a male screw member 43a formed by connecting the pressure member 42 to the tip, and a female screw member 43b that can be screwed into the male screw member 43a. In the present embodiment, the operation portion 43 is formed integrally with the pressure member 42. More specifically, the male screw member 43a is formed using a hand screw, and converts a rotational force into an axial force when a rotational force is applied to the head portion 43a1. At this time, the male screw member 43a and the pressure member 42 are configured to advance and retract integrally with respect to the female screw member 43b using this axial force. The rotating shaft 4 is configured to expand and contract the diameter of the shaft body 41 in accordance with a change in the pressure received by the pressure medium, that is, the water pressure as the male screw member 43a and the pressure member 42 advance and retreat.

  On the other hand, the bearing hole 22a is provided at a portion corresponding to the shaft main body 41, and the shaft main body 41 is accommodated without a substantial gap. The shaft main body 41 is held in a state where at least a part of the shaft main body 41 is in contact, and the frictional force between the shaft main body 41 and the shaft main body 41 is changed in accordance with the change in the diameter of the shaft main body 41.

  Next, the operation of each part according to the present invention will be described below.

  First, when the male screw member 43a is rotated in the fastening direction, the axial force of the screw is applied to the pressure member 42, and the pressure member 42 moves toward the inner space 41s side of the shaft body 41. At this time, pressure is applied to the water in the internal space 41 s of the shaft body 41 via the pressure member 42. Further, the applied pressure is transmitted to the entire surface of the shaft main body 41 and presses the shaft main body 41 outward. In response to this pressing force, the shaft body 41 is elastically deformed to increase its diameter. Then, in response to the increase in the diameter of the shaft main body 41, the frictional force between the shaft main body 41 and the bearing hole 22a increases.

  Conversely, when the male screw member 43a is rotated in the anti-tightening direction, the pressure member 42 moves in a direction away from the shaft main body 41 side while receiving water pressure from the water in the internal space 41s of the shaft main body 41. At this time, the pressure applied to the water in the internal space 41s of the shaft main body 41 via the pressure member 42 decreases, and the water pressure in the internal space 41s also decreases, so that the shaft main body 41 is deformed by its own elasticity, and the shaft The diameter of the main body 41 is reduced. In response to the diameter reduction of the shaft body 41, the frictional force between the shaft body 41 and the bearing hole 22a also decreases.

  In addition, since the effect | action of each part at the time of performing the display by the said display unit 21 utilizes what is known as what is used for this kind of head mounted display apparatus, detailed description is abbreviate | omitted.

  That is, according to the configuration of the rotating shaft 4 according to the present embodiment, the pressure member 42 presses the water that is the pressure medium filled in the internal space 41 s of the shaft main body 41 to transmit the pressure to the pressure medium. The friction force between the shaft body 41 and the bearing hole 22a can be changed by further transmitting the pressure to the outer periphery of the shaft body 41 to elastically deform the shaft body 41 and changing the diameter of the shaft body 41. it can. That is, the force that presses the water in the shaft main body 41 by the pressurizing member 42 uses the Pascal principle, that is, the same pressure as the pressure received by the pressurizing member 42 fills the internal space 41 s of the shaft main body 41. The force received by the pressure member 42 when the area of the portion of the pressure member 42 in contact with water is A and the area of the cylindrical surface of the shaft body 41 is B In order to amplify and further transmit to the outer periphery of the shaft main body 41, the diameter of the shaft main body 41 is changed with a small operating force. Therefore, a sufficiently large pressure can be created to easily change the frictional force between the shaft main body 41 and the bearing hole 22a. Therefore, when forming the shaft main body 41 and the bearing hole 22a, high processing accuracy is not necessarily required. Further, by changing the diameter of the shaft body 41, the frictional force between the shaft body 41 and the bearing hole 22a is changed, and the friction between the rotating shaft 4 and the bearing hole 22a is constant regardless of the ambient temperature. To satisfy each user's desire to be able to obtain a desired operational feeling by changing the magnitude of friction between the rotating shaft 4 and the bearing hole 22a for each user. it can.

  Further, since the operation section 43 includes a male screw member 43a formed by connecting the pressure member 42 to the tip, and a female screw member 43b that can be screwed to the male screw member 43a, the male screw member 43a and the female screw member 43b. And the male screw member 43a is advanced and retracted with respect to the female screw member 43b, so that the pressure member 42 connected to the tip of the male screw member 43a can be simultaneously advanced and retracted. Therefore, the pressure member 42 can be advanced and retracted with a smaller operating force, the pressure member 42 can be easily advanced and retracted, and the pressure member 42 can be held at an arbitrary position. Can be.

  Furthermore, since water is used as the pressure medium, the pressure can be transmitted uniformly over the entire inner surface of the shaft body 41, and such a pressure medium can be obtained easily and inexpensively.

  And since the said shaft main body 41 is formed with resin, the shaft main body 41 can be elastically deformed by a smaller pressure change, and the diameter can be changed.

  The present invention is not limited to the embodiment described above.

  For example, a liquid other than water may be used as the pressure medium, or a solid or gel that can be elastically deformed and can transmit pressure, such as rubber, may be used. Of course, a gas may be used as the pressure medium. However, if the pressure medium is liquid or solid, the advance / retreat width of the pressure member can be reduced.

  Further, the hinge shaft of the present invention may be provided in a hinge portion of a notebook computer or a mobile phone, and a hinge mechanism that can be held at an arbitrary relative angle may be realized.

  Furthermore, in the above-described embodiment, the position of the pressure member can be adjusted steplessly by the screw action, but a configuration in which the pressure member can be selectively held at any of a plurality of locking positions is adopted. May be.

  In addition, in the above-described embodiment, the rotation shaft is attached to the clip so as not to rotate, and is inserted into the bearing hole formed in the display device body. However, the rotation shaft is configured to be rotatable integrally with the display device body. Of course, it may be inserted through a bearing hole provided in the clip.

  And the shaft main body is not limited to the one formed of resin, even if it is formed in a cylindrical shape that can be elastically deformed and can fill the pressure medium with hard rubber or elastic metal, etc. The most important effect of the present invention, that is, an effect capable of adjusting the frictional force with the bearing can be obtained.

  In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

The figure which shows the usage condition of the head mounted display apparatus which concerns on one Embodiment of this invention. Sectional drawing containing the axial center which shows the support part which concerns on the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Head-mounted display apparatus 2 ... Display apparatus main body 22a ... Bearing hole 3 ... Support part 4 ... Rotating shaft 41 ... Shaft main body 42 ... Pressurizing member 43 ... Operation part 43a ... Male screw member 43b ... Female screw member

Claims (7)

A shaft main body which is filled with a pressure medium and whose diameter can be changed by elastic deformation when the pressure received from the pressure medium changes, and a pressure transmission means for transmitting pressure to the pressure medium in the shaft main body are provided. A rotating shaft characterized by that. The pressure transmitting means presses the pressure medium in the shaft main body to transmit pressure to the pressure medium, and the pressure member is advanced and retracted to change the pressure transmitted from the pressure member to the pressure medium. The rotating shaft according to claim 1, further comprising an operation unit that receives an operation force for operating the rotating shaft. The rotating shaft according to claim 2, wherein the operating portion includes a male screw member formed by connecting the pressure member to a tip, and a female screw member that can be screwed to the male screw member. The rotating shaft according to claim 1, wherein the pressure medium is a liquid. The rotating shaft according to claim 1, 2, 3, or 4, wherein the shaft body is formed of resin. A display device main body having a display unit and a support unit for rotatably supporting the display device main body on a helmet, wherein the support unit contacts at least part of the bearing hole and the bearing hole. A rotating shaft that is inserted in a state where the rotating shaft is filled, and the rotating shaft is filled with a pressure medium, and when the pressure received from the pressure medium changes, the shaft main body can be changed in diameter by elastic deformation; A head-mounted display device comprising pressure transmitting means for transmitting pressure to a pressure medium in the shaft main body. The pressure transmitting means presses the pressure medium in the shaft main body to transmit pressure to the pressure medium, and the pressure member is advanced and retracted to change the pressure transmitted from the pressure member to the pressure medium. The head-mounted display device according to claim 6, further comprising an operation unit that receives an operation force for operation.

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