Electronic device

Abstract

To provide an electronic device provided with a tilt mechanism capable of adjusting an installation angle with an appropriate torque.SOLUTION: A projection device comprises a housing, a rotational shaft 44, an arm 34L that supports the housing by rotating together with the rotational shaft 44, a rotary sleeve SL that is provided around an axis of the rotational shaft 44 and rotates together with the rotational shaft 44, and a cam member 42 that is in contact with the rotary sleeve SL between a small diameter part 42a1 and a large diameter part 42a2. When the cam member 42 is in contact with an outer peripheral surface of the rotary sleeve SL, the rotary sleeve SL is allowed to rotate in an opening direction, and a one-way clutch is activated in which the cam member 42 is restricted from rotating in a closing direction of being driven toward the large diameter part 42a2. When the cam member 42 is separated from the outer peripheral surface of the rotary sleeve SL, the one-way clutch is released.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to electronic devices. [Background technology]

[0002] Conventionally, electronic devices such as projection devices and display devices have been proposed that are provided with a tilt mechanism for adjusting the installation angle of the housing. For example, Patent Document 1 discloses a screen angle adjustment device for a display device that is provided with a lifting means for lifting and tilting the display device. The lifting means includes a first lift arm and a second lift arm that are rotatably attached around the axis of a support shaft. This screen angle adjustment device is configured such that friction torque is generated when the first lift arm and the second lift arm rotate by adjusting the tightening of a tightening nut attached to the support shaft. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-128088 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, if a tilt mechanism that utilizes friction torque, such as the angle adjustment device disclosed in Patent Document 1, is provided, a force greater than the torque required to support the weight of the housing is required when adjusting the installation angle, and there is a risk that excessive force will be generated and the tilt mechanism will be damaged if an attempt is made to forcibly close it.

[0005] An object of the present invention is to provide an electronic device equipped with a tilt mechanism that can adjust the installation angle with an appropriate torque. [Means for solving the problem]

[0006] The electronic device of the present invention comprises a housing, a rotating shaft which rotates around an axis relative to the housing, a support member extending radially from the rotating shaft and rotating together with the rotating shaft to support the housing in accordance with an installation angle of the housing relative to an installation surface, a first rotating member which is provided around the axis of the rotating shaft and rotates together with the rotating shaft, and a cam member which has a small diameter portion and a large diameter portion having a larger diameter than the small diameter portion and abuts against the first rotating member between the small diameter portion and the large diameter portion, wherein in a first state in which the cam member abuts against an abutment surface of the first rotating member, a one-way clutch is activated which allows rotation of the first rotating member around its axis in a first direction in which the cam member is driven toward the small diameter portion, and restricts rotation of the first rotating member around its axis in a second direction in which the cam member is driven toward the large diameter portion, and in a second state in which the cam member is separated from the abutment surface of the first rotating member, the one-way clutch is released and rotation in the first direction and the second direction is permitted. Effect of the Invention

[0007] According to the present invention, it is possible to provide an electronic device equipped with a tilt mechanism capable of adjusting the installation angle with an appropriate torque. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view of a projection device according to an embodiment, seen from the lower front side. [Diagram 2] FIG. 2 is an exploded perspective view of a tilt mechanism of the projection device according to the embodiment, as viewed from below. [Diagram 3] 1 is an exploded perspective view of a left rotation mechanism in a projection device according to an embodiment, seen from above. FIG. [Figure 4] FIG. 1A is a perspective view of a base member of a projection device according to an embodiment, and FIG. [Diagram 5] FIG. 2A is a perspective view of one of the rotation mechanisms in the projection device according to the embodiment, and FIG. 2B is a top view of the one of the rotation mechanisms. [Figure 6]4 is a side view of a cam member of the projection device according to the embodiment, seen from the outside in the axial direction. FIG. [Figure 7] 5A and 5B are side views showing a state in which a rotating sleeve and a cam member are in contact with each other in a projection device according to an embodiment, and FIG. 5A shows a side view of the contact state, and FIG. [Figure 8] 1A and 1B are side views of a base member to which a rotating shaft, a cam member, a rotating lever, and a second coil spring are assembled in a projection device according to an embodiment, as viewed from the outside in the axial direction, where (a) shows a side view in an abutting state, and (b) shows a side view in a separated state. [Figure 9] 5A is a cross-sectional view of one of the rotation mechanisms in the projection device according to the embodiment, taken along line IX-IX in FIG. 5A. [Figure 10] 1A is a side view of one arm and one rotation mechanism in a closed state as viewed from the outside in the axial direction, and FIG. 1B is an enlarged side view of a main part of the rotation mechanism surrounded by a dashed line in FIG. [Figure 11] 1A is a side view of one arm and one rotation mechanism viewed from the outside in the axial direction when the arm has been rotated from a closed state to an open direction by a predetermined rotation angle, and FIG. 1B is an enlarged side view of a key portion of the rotation mechanism surrounded by a dashed line in FIG. [Figure 12] 1A is a side view of one arm and one rotation mechanism in an open state as viewed from the outside in the axial direction, and FIG. 1B is an enlarged side view of a main part of the rotation mechanism surrounded by a dashed line in FIG. [Figure 13] 1A is a side view of one arm and one rotation mechanism viewed from the outside in the axial direction when the arm has been rotated from the open state to the closing direction by a predetermined rotation angle, and FIG. 1B is an enlarged side view of the main part of the rotation mechanism surrounded by dashed lines in FIG. [Figure 14] 1A is a side view of one arm and one rotation mechanism viewed from the outside in the axial direction when the arm has been rotated from the open state to the closing direction by a predetermined rotation angle, and FIG. 1B is an enlarged side view of the main part of the rotation mechanism surrounded by dashed lines in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a projection device (electronic device) 10 according to the embodiment includes a housing 20 having six faces (upper face 20a, lower face 20b, left side face 20c, right side face 20d, front face 20e, and rear face 20f) in a substantially rectangular box shape with the left-right direction as the longitudinal direction. The projection device 10 has a projection port 11 from which projection light is emitted on the front face 20e side. In the following description, the left and right of the projection device 10 refer to the left and right directions with respect to the main emission direction X of the projection light from the projection port 11, and the front and rear refer to the emission direction X of the projection light of the projection device 10 and the opposite direction as the front and rear directions, respectively. The upper face 20a side is the upper side of the projection device 10, and the lower face 20b side is the lower side of the projection device 10.

[0010] The housing 20 has an upper case 21 having an upper surface 20a and a part of a right side surface 20d, and a lower case 22 having a lower surface 20b and a part of a right side surface 20d. The housing 20 has a front panel 23 on the front side, a rear panel 24 on the rear side, and a left panel 25 on the left side. The front panel 23 is provided with a projection port opening 23a through which the projection port 11 is exposed, an intake port 23b, and an exhaust port 23c. The left panel 25 is provided with an intake port 25a and a connection port 25b such as a connector for image input / output. In the projection device 10, a tilt mechanism TL for adjusting the installation angle of the housing 20 is provided in the front part of the lower surface 20b of the housing 20.

[0011] As shown in Figs. 1 and 2, the tilt mechanism TL is configured to include a pair of arms (support members) 34R, 34L, a connection plate 36, and a rotation mechanism 40 for rotating both arms 34R, 34L relative to the housing 20. The connection plate 36 has an elongated shape along the left and right sides of the front surface 20e, and the pair of arms 34R, 34L are attached so as to extend from the left and right ends of the connection plate 36 toward the rear surface 20f, respectively. The front parts of the pair of arms 34R, 34L are rotated downward by the rotation mechanism 40. The pair of arms 34R, 34L and the connection plate 36 support the housing 20 in a state in which the installation angle of the housing 20 is adjusted with respect to the installation surface IS (see Fig. 10) on which the projection device 10 is installed.

[0012] In the tilt mechanism TL, the projection device 10 can project at any installation angle (elevation angle) within a range between a state in which the pair of arms 34R, 34L are closed relative to the bottom surface 20b of the housing 20, in other words, a state in which the pair of arms 34R, 34L form an angle of 0° relative to the bottom surface 20b of the housing 20 (a state shown by solid lines in FIG. 1, hereinafter referred to as the "closed state"), and a state in which the pair of arms 34R, 34L are open so as to hang down at an angle of approximately 90° relative to the bottom surface 20b of the housing 20 (a state shown by dashed lines in FIG. 1, hereinafter referred to as the "open state"). Below, the shape, connection direction, etc. of each member constituting the tilt mechanism TL will be described based on the closed state.

[0013] The pair of arms 34R, 34L and the pair of rotation mechanisms 40 are provided on both left and right ends of the lower surface 20b of the housing 20 (the both edge sides constituting the opposite sides of the housing 20). The connection plate 36 connects the pair of arms 34R, 34L and abuts against the installation surface IS (see FIG. 10) according to the above-mentioned installation angle. The pair of arms 34R, 34L are symmetrical in shape and are sheet metal members having first arm plates 34R1, 34L1 and second arm plates 34R2, 34L2, respectively. The first arm plates 34R1, 34L1 are plate-shaped with both plate surfaces facing left and right and the width in the up-down direction increases toward the rear side.

[0014] As shown in Fig. 3, the base end (rear end) of the first arm plate 34L1 of the left arm 34L is provided with a pivot hole 34L1a through which a mounting screw 41 of a rotation mechanism 40 (described later) is inserted and pivotally supported, and a locking recess 34L1b into which one end SP1a of a first coil spring SP1 (described later) is locked. The open end of the pivot hole 34L1a is provided in a substantially rectangular shape with both upper and lower sides formed in an arc shape and both left and right sides formed in a straight line. Although not shown, a pivot hole and a locking recess are also provided in the first arm plate 34R1 of the right arm 34R.

[0015] The second arm plates 34R2, 34L2 of the arms 34R, 34L are plate-shaped, and are provided in a portion of the arms 34R, 34L except for the rear end portion thereof with the plate surface parallel to the lower surface 20b of the housing 20 (approximately perpendicular to the plate surface of the first arm plates 34R1, 34L1). The lower surface 20b of the housing 20 is provided with a first arm housing groove 26a in which the first arm plates 34R1, 34L1 of the arms 34R, 34L are housed in the closed state. The front side of the first arm housing groove 26a is provided with a second arm housing groove 26b, which is a shallow recess that opens downward and in which the second arm plates 34R2, 34L2 of the arms 34R, 34L are housed.

[0016] The connection plate 36 is a substantially rectangular sheet metal member that matches the dimension of the long side direction of the housing 20. Both ends of the connection plate 36 in the long side direction are connected to the front ends of the arms 34R, 34L by screw members 35, and connect the arms 34R, 34L. In a closed state in which the pair of arms 34R, 34L are accommodated in the first arm accommodation groove 26a and the second arm accommodation groove 26b, the upper surface of the connection plate 36 abuts against the lower surface 20b of the housing 20, and the lower surface of the connection plate 36 protrudes downward from the lower surface 20b of the housing 20 (see FIG. 1). For this reason, a pair of installation members 50 made of a rubber material or the like are provided on the rear part of the lower surface 20b of the housing 20 in order to adjust the height so that the housing 20 is placed flat in a horizontal position when the lower surface 20b of the housing 20 is placed flat with the lower surface 20b facing downward in the closed state.

[0017] Next, a pair of rotation mechanisms 40 for rotating the arms 34R, 34L relative to the lower surface 20b of the housing 20 will be described in detail. Each member of the pair of rotation mechanisms 40 has a symmetrical shape and configuration, and the following describes the rotation mechanism 40 provided on the left side of the lower surface 20b of the housing 20. On the lower surface 20b of the housing 20, a mounting portion 27 is provided on the rear side of each first arm housing groove 26a, to which each rotation mechanism 40 is attached to the lower surface 20b of the housing 20. Each mounting portion 27 is composed of a housing recess 27a provided in a manner continuing from the first arm housing groove 26a and housing the rotation mechanism 40, and a mounting surface 27b provided in a manner continuing from the lower surface 20b of the housing 20 and to which the rotation mechanism 40 is attached. The mounting surface 27b is provided with two screw holes 27b1 to which the base member 46 of the rotation mechanism 40 is screwed. Although there are two screw holes 27b1 and two screws attached to the screw holes 27b1, at least one each is sufficient.

[0018] 3, the rotation mechanism 40 includes a mounting screw 41, a cam member 42, a lever member (third rotating member) 43, a first coil spring (coil spring member) SP1, a second coil spring (elastic member) SP2, a rotating shaft 44, a base member 46, a fastening member 47, a rotating sleeve (first rotating member) SL, a rotating washer (second rotating member) 48, a first washer W1, a second washer W2, a third washer W3, a retaining ring, and a tightening nut 49. Although details will be described later, the rotation mechanism 40 is configured so that a torque limiter is activated when a torque (rotational torque) equal to or greater than a predetermined torque is generated around the axis of the rotating shaft 44, and also transitions between a state in which a one-way clutch that restricts rotation in a rotation direction is activated in a closed state in which the pair of arms 34R, 34L are open relative to the lower surface 20b of the housing 20, and a state in which the one-way clutch is released and does not act.

[0019] The mounting screw 41 is a screw-like member, and is inserted from the outside into the shaft support hole portion 34L1a of each arm 34R, 34L. The cam member 42 is a member formed by penetrating a roller-like cam roller 42a with a shaft-like cam shaft 42b. The cam roller 42a has a cam-like outer circumferential surface (contact surface) and has a portion whose outer diameter varies depending on the position on the outer circumferential surface. Of both sides of the cam shaft 42b penetrating the cam roller 42a and protruding from the cam roller 42a, a portion of the side protruding toward the outside of the housing 20 is missing along the axial direction, and due to this missing portion, the D-cut shape is a flat surface rather than a curved surface (hereinafter, the D-cut shaped portion is referred to as a "flat surface portion 42b1"). The configuration of the cam roller 42a will be described in detail later.

[0020] The lever member 43 is a member that rotates together with the camshaft 42b of the cam member 42, and has a camshaft insertion portion 43a, a fastening portion 43b, and a switching portion 43c. The camshaft insertion portion 43a is a short cylinder with a column axis direction along the left-right direction. An insertion recess 43a1 that opens toward the inside of the housing 20 is provided inside the camshaft insertion portion 43a, as shown in a perspective view E2 of the lever member 43 viewed from the opposite side in FIG. 3. The insertion recess 43a1 has an inner surface that is a size and shape corresponding to a portion of the camshaft in the vicinity of the flat surface portion 42b1, so that the portion in the vicinity is inserted without a gap. The fastening portion 43b is a substantially square tube that extends upward from the camshaft insertion portion 43a. A fastening hole 43b1, which is a through hole into which the fastening member 47 is inserted, is provided along the up-down direction inside the fastening portion 43b.

[0021] Here, the fastening member 47 will be described. The fastening member 47 is a substantially cylindrical member, and is inserted into the fastening hole 43b1 with its column axis aligned in the vertical direction. The outer peripheral surface of the fastening member 47 and the inner surface of the fastening hole 43b1 are provided with a thread groove (not shown) for screwing the fastening member 47 into the fastening hole 43b1. On the other hand, the camshaft 42b is inserted into the insertion recess 43a1 with the flat surface of the flat surface portion 42b1 facing upward. Then, the fastening member 47 is screwed into the fastening hole 43b1 until one end of the fastening member 47 is pressed against the flat surface, thereby fixing the lever member 43 to the camshaft 42b.

[0022] The switching portion 43c is generally plate-shaped and extends rearward from the surface of the camshaft insertion portion 43a that faces the outside of the housing 20, with both plate surfaces facing the left-right direction. A spring attachment hole 43c1 that penetrates in the left-right direction and to which the other end SP2b of the second coil spring SP2 described later is attached is provided at the tip of the switching portion 43c extending rearward. The lever member 43 rotates together with the camshaft 42b around the camshaft insertion portion 43a as the center of rotation by inserting the camshaft 42b into the insertion recess 43a1 and fastening it.

[0023] The first coil spring SP1 is assembled around the axis of the rotating shaft 44, with one end SP1a locked in the locking recess 34L1b of the arm 34L and the other end SP2b attached to a spring attachment hole 46b3 (see FIG. 4(a)) of the base member 46 described below. In a state in which one end SP1a of the first coil spring SP1 is locked in the locking recess 34L1b and the other end SP1b of the first coil spring SP1 is attached to the spring attachment hole 46b3, the arm 34L is biased in a direction closing against the lower surface 20b of the housing 20 by the elastic force of the first coil spring SP1.

[0024] The second coil spring SP2 is provided between the lever member 43 and the base member 46, with one end SP2a attached to a spring attachment hole 46b4 (see FIG. 4(b)) of the base member 46 and the other end SP2b attached to a spring attachment hole 43c1 of the lever member 43. In a state in which one end SP2a of the second coil spring SP2 is attached to the spring attachment hole 46b4 and the other end SP2b is attached to the spring attachment hole 43c1, the lever member 43 is biased against the base member 46 by the elastic force of the second coil spring SP2. The biasing manner of the lever member 43 biased by the second coil spring SP2 will be described in detail later.

[0025] The rotating shaft 44 is a shaft-shaped member and is arranged rotatably with respect to the housing 20 in a position in which the axial direction coincides with the left-right direction. The rotating shaft 44 has a first shaft portion 44a provided on the outer side in the axial direction (on the arm 34L side), a second shaft portion 44b provided on the inner side of the first shaft portion 44a in the axial direction and having a smaller diameter than the first shaft portion 44a, a third shaft portion 44c provided on the inner side of the second shaft portion 44b in the axial direction and having a smaller diameter than the second shaft portion 44b, a held portion 44d provided between the first shaft portion 44a and the second shaft portion 44b and having a smaller diameter than the first shaft portion 44a and a larger diameter than the second shaft portion 44b, and a protruding portion 44e that protrudes slightly outward from the outer surface of the first shaft portion 44a in the axial direction. The end of the rotating shaft 44 on the first shaft portion 44a side is connected to the arms 34R and 34L. In other words, the arms 34R, 34L extend from the rotation shaft 44 in the radial direction thereof.

[0026] The outer diameter of the first shaft portion 44a is set to be slightly smaller than the inner diameter of the wound portion of the first coil spring SP1. A screw groove 44G1 is provided on the outer peripheral surface of the tip portion of the second shaft portion 44b on the inner side in the axial direction. A fitting groove 44G2 is provided on a part of the third shaft portion 44c, the diameter of which is reduced and into which a retaining ring W4 described later is fitted. The protruding portion 44e is provided with a screw hole 44e1 that opens toward the outside in the axial direction and into which the mounting screw 41 is screwed. The protruding portion 44e is provided so that it has substantially the same shape as the shaft support hole portion 34L1a of the arm 34L and the outer peripheral size of the protruding portion 44e is slightly smaller than the inner peripheral size of the shaft support hole portion 34L1a so that the protruding portion 44e is inserted into the shaft support hole portion 34L1a of the arm 34L and fixed to the arm 34L.

[0027] In the following description, the outside in the axial direction of the rotating shaft 44 in the rotating mechanism 40 is referred to as the "outside in the axial direction," and the inside in the axial direction of the rotating shaft 44 is referred to as the "inside in the axial direction." That is, in the rotating mechanism 40 provided on the right side of the pair of rotating mechanisms 40, the "outside in the axial direction" refers to the right side, and the "inside in the axial direction" refers to the left side. On the other hand, in the rotating mechanism 40 provided on the left side, the "outside in the axial direction" refers to the left side, and the "inside in the axial direction" refers to the right side.

[0028] The base member 46 is a member for rotatably holding the rotating shaft 44 relative to the lower surface 20b of the housing 20 and for attaching the rotating mechanism 40 to the housing 20. The base member 46 supports the rotating shaft 44 relative to the housing 20 so as to be rotatable about its axis, and supports the cam shaft 42b relative to the housing 20 so as to be rotatable about its axis. The configuration of the base member 46 will be described in detail later. The rotating sleeve SL is a short cylindrical rubber member having a sleeve through hole SL1, which is a through hole, provided on the inside, and is provided around the axis of the rotating shaft 44. The second shaft portion 44b of the rotating shaft 44 is inserted into the sleeve through hole SL1. The inner diameter of the sleeve through hole SL1 is approximately equal to the outer diameter of the second shaft portion 44b of the rotating shaft 44. Therefore, the second shaft portion 44b is inserted into the sleeve through hole SL1, and frictional force acts between the rotating sleeve SL and the rotating shaft 44, so that the rotating sleeve SL rotates together with the rotating shaft 44.

[0029] As shown in the enlarged view E1 of FIG. 3, the rotating washer 48 is a washer-shaped member and is disposed axially inward of the base member 46. The rotating washer 48 has a substantially plate-shaped washer plate surface 48a. A through hole, a washer through hole 48c, is provided inside the washer plate surface 48a. The washer through hole 48c is provided so that the opening of the washer through hole 48c has substantially the same shape as the outer shape of the protruding portion 44e of the rotating shaft 44 and the size of the opening inner circumference is slightly larger than the outer circumference of the protruding portion 44e. Therefore, the protruding portion 44e of the rotating shaft 44 is inserted into the washer through hole 48c, whereby the rotating washer 48 is fitted to the rotating shaft 44, and the rotating washer 48 can rotate together with the rotating shaft 44.

[0030] The washer plate surface 48a has a pair of wing portions 48a1, 48a2 extending in a wing shape in the radial direction of the rotating washer 48 (in the radial direction of the rotating shaft 44 when the rotating shaft 44 is inserted through the washer through hole 48c). The pair of wing portions 48a1, 48a2 are provided at positions at an angle of approximately 90° with respect to the center of the rotating washer 48. The first washer W1 and the second washer W2 are both dish-shaped washers (disc spring washers), and the third washer W3 is a flat washer. The second shaft portion 44b of the rotating shaft 44 is inserted inside the first to third washers W1, W2, and W3. The retaining ring W4 is a retaining ring (E-shaped retaining ring) whose opening is open to one side in the radial direction, and is fitted into the fitting groove 44G2 in the third shaft portion 44c of the rotating shaft 44. The tightening nut 49 is a nut-shaped member, and is disposed on the third shaft portion 44c axially inwardly of the first to third washers W1, W2, W3.

[0031] Next, the configuration of the base member 46 will be described in detail with reference to FIG. 4. As shown in FIGS. 4(a) and 4(b), the base member 46 has a bottom plate 46a, an outer side plate 46b rising upward from the outer edge of the bottom plate 46a in the axial direction, an inner side plate 46c rising upward from the inner edge of the bottom plate 46a in the axial direction, and a lever interference plate 46d extending from a part of the rising tip of the outer side plate 46b toward the inside in the axial direction at a substantially right angle. The bottom plate 46a is provided with two mounting screw holes H1 and H2 arranged in the front-rear direction for screwing the base member 46 to each screw fixing hole 27b1 of the mounting surface 27b of the housing 20. Note that the number of screws attached to the mounting screw holes H1 and H2 and the mounting screw holes H1 and H2 is two each, but at least one is sufficient. The base member 46 is placed in the accommodating recess 27a with the bottom plate 46a facing downward, and is attached to the housing 20 by being positioned so that the mounting screw holes H1, H2 overlap with the respective screw fastening holes 27b1 and screwed from the underside of the housing 20.

[0032] The outer side plate 46b is provided with an opening that extends horizontally in the front-rear direction and opens so as to penetrate in the left-right direction. The front side of this opening is a first outer opening 46b1 that is substantially circular, and the rear side is a second outer opening 46b2 that is substantially elliptical. The first outer opening 46b1 has a vertical dimension of the inner circumferential surface that is slightly larger than the outer diameter of the held portion 44d of the rotating shaft 44. The second outer opening 46b2 has a vertical dimension of the inner circumferential surface that is slightly larger than the outer diameter of the camshaft 42b. A spring attachment hole 46b3 to which the other end SP1b of the first coil spring is attached is provided on the outer side plate 46b slightly above the boundary between the first outer opening 46b1 and the second outer opening 46b2. In addition, a spring attachment hole 46b4 to which one end SP1a of the second coil spring is attached is provided on the rear side of the second outer opening 46b2 of the outer side plate 46b.

[0033] The inner side plate 46c is provided with a first inner opening 46c1 that opens in a substantially circular shape, and a second inner opening 46c2 that opens in a substantially elliptical shape that is long in the front-rear direction on the rear side of the first inner opening 46c1. The first inner opening 46c1 has an inner diameter that is slightly larger than the outer diameter of the third shaft portion 44c of the rotating shaft 44. The second inner opening 46c2 has an inner diameter that is larger than the outer diameter of the cam shaft 42b. The lever interference plate 46d is provided in a shape that slightly protrudes outward in the axial direction from the rear end of the rising tip of the inner side plate 46c.

[0034] Next, the assembly of each member constituting the rotation mechanism 40 will be described with reference to Fig. 3 and Fig. 5. Fig. 5 illustrates the rotation mechanism 40 provided on the left side of the lower surface 20b of the housing 20. First, the cam roller 42a is inserted between the outer side plate 46b and the inner side plate 46c from the first outer opening 46b1 of the base member 46, the side of the camshaft 42b opposite to the side on which the flat surface portion 42b1 is provided is inserted into the second inner opening 46c2, and the side of the camshaft 42b on which the flat surface portion 42b1 is provided is disposed in the second outer opening 46b2. As a result, the camshaft 42b is held rotatably around its axis with respect to the base member 46 with the cam roller 42a positioned between the outer side plate 46b and the inner side plate 46c.

[0035] Next, the second shaft portion 44b of the rotating shaft 44 is inserted into the sleeve through hole SL1, and the first to third washers W1 to W3 are fitted to the second shaft portion 44b exposed to the inside of the axial direction of the rotating sleeve SL. After that, the tightening nut 49 is tightened into the screw groove 44G1 of the rotating shaft 44, and the tightening nut 49 is attached. Specifically, the first washer W1 and the second washer W2 are placed opposite each other and sandwiched between the third washer W3 and the sleeve through hole SL1, and the tightening nut 49 is tightened from the inside to adjust the axial pressing force of the rotating shaft 44. Then, the rotating sleeve SL is passed between the outer side plate 46b and the inner side plate 46c from the first outer opening 46b1, the third shaft portion 44c is inserted into the first inner opening 46c1, and the held portion 44d is disposed in the first outer opening 46b1. Furthermore, a retaining ring W4 is fitted into the fitting groove 44G2 of the third shaft portion 44c exposed axially inward from the inner side plate 46c.

[0036] This prevents the rotating shaft 44 from slipping out of the first inner opening 46c1, and with the rotating sleeve SL positioned between the outer side plate 46b and the inner side plate 46c and the rotating sleeve SL abutting against the cam roller 42a in the front-rear direction, the rotating shaft 44 is held rotatably about its axis relative to the base member 46. The opening sizes of the first outer opening 46b1 and the second outer opening 46b2 are such that, when the cam shaft 42b and the rotating shaft 44 are assembled to the base member 46, the center of the rotating sleeve SL and the center of the cam shaft 42b are aligned on straight lines parallel to the front-rear direction, and the rotating sleeve SL can abut against the cam roller 42a without any gaps.

[0037] Next, one end SP2a and the other end SP2b of the second coil spring SP2 are attached to each spring attachment hole 46b4, 43c1 so that the second coil spring SP2 is positioned between the outer side plate 46b and the switching portion 43c of the lever member 43, while the cam shaft 42b is inserted into the insertion recess 43a1, and the fastening member 47 is inserted into the fastening hole 43b1 and fastened. As a result, the lever member 43 is fixed to one end side of the cam shaft 42b via the fastening member 47, and the lever member 43 rotates around its axis together with the cam shaft 42b. In response to the rotation of the lever member 43, the switching portion 43c biased by the second coil spring SP2 can rotate upward or downward.

[0038] Next, the wound portion of the first coil spring SP1 is assembled around the first shaft portion 44a of the rotating shaft 44 exposed from the outer side plate 46b to the outside in the axial direction, and the protruding portion 44e is inserted into the washer through hole 48c of the rotating washer 48 to assemble the rotating washer 48. By assembling the rotating washer 48, the lever member 43 is arranged in parallel with the rotating washer 48 in the front-rear direction, and the front end portion of the switching portion 43c of the lever member 43 is disposed on the rotation path of the wing portions 48a1, 48a2 of the rotating washer 48. That is, the front end portion of the switching portion 43c is disposed at a position where it interferes with the wing portions 48a1, 48a2 as the rotating washer 48 rotates around the axis.

[0039] Next, one end SP1a of the first coil spring SP1 is engaged with the engaging recess 34L1b of the arm 34L. Finally, the protrusion 44e of the rotating shaft 44 is fitted into the shaft support hole 34L1a of the arm 34L from the inside in the axial direction, and the mounting screw 41 is screwed into the screw hole 44e1 to fix the rotating shaft 44 to the arm 34L. Through the above procedure, the rotating mechanism 40 is assembled to the arm 34L, and the rotating shaft 44 rotates together with the arm 34L around its axis. In addition, as the rotating shaft 44 rotates, the rotating sleeve SL assembled to the rotating shaft 44 rotates together with the rotating shaft 44 around its axis.

[0040] Next, the configuration of the cam roller 42a in the cam member 42 will be described in detail with reference to Fig. 6. In the side view shown in Fig. 6, the side of the cam roller 42a that comes into contact with the rotating sleeve SL (the side facing forward when the rotation mechanism 40 is assembled) is illustrated as the left side. As shown in Fig. 6, the cam roller 42a has a shape in which the diameter smoothly and gradually increases from a small diameter portion 42a1 located on the lower side and having a small diameter toward a large diameter portion 42a2 located on the upper side and having a larger diameter than the small diameter portion 42a1 in a portion within a range of approximately 180° around the center 42C of the cam shaft 42b that comes into contact with or is close to the rotating sleeve SL (the left side portion shown in Fig. 6).

[0041] Specifically, the diameter of the cam roller 42a is increased by, for example, 0.1 mm at intervals of 10° around the center 42C of the cam shaft 42b in the order of positions P2, P3, P4, and P5 from position P1, where the diameter is equal to that of the small diameter portion 42a1 in the vicinity of the contact portion with the rotating sleeve SL, to the large diameter portion 42a2. At position P5, the diameter is equal to that of the large diameter portion 42a2. Therefore, in the example shown in FIG. 6, the difference in diameter between the small diameter portion 42a1 and the large diameter portion 42a2 is 0.4 mm. The cam roller 42a contacts the rotating sleeve SL between the small diameter portion 42a1 and the large diameter portion 42a2. In the example shown in FIG. 6, the cam roller 42a contacts the rotating sleeve SL in the vicinity of position P2 among positions P1 to P5. The diameter of the cam member 42 increases by 0.1 mm at 10° intervals from position P1 to position P5, but may be shorter or longer than 0.1 mm depending on the size of the cam member 42.

[0042] Next, the contact state between the rotating sleeve SL and the cam member 42 and the operation state of the one-way clutch acting in the rotation mechanism 40 will be described with reference to Figs. 7 and 8. In the projection device 10 of this embodiment, as the arm 34L (rotating shaft 44) rotates, the state transitions between a state in which the cam member 42 contacts the outer circumferential surface of the rotating sleeve SL (hereinafter referred to as the "contact state (first state)") and a state in which the cam member 42 is separated from the outer circumferential surface of the rotating sleeve SL (hereinafter referred to as the "separated state (second state)"). In the following, the direction in which the arm 34L (rotating shaft 44) opens relative to the lower surface 20b of the housing 20 is referred to as the opening direction (first direction) D1, and the direction in which the arm 34L (rotating shaft 44) closes relative to the lower surface 20b of the housing 20 is referred to as the closing direction (second direction) D2. In Figs. 7 and 8, the direction in which the rotating sleeve SL rotates counterclockwise is the opening direction D1, and the direction in which the rotating sleeve SL rotates clockwise is the closing direction D2.

[0043] 7(a) and 8(a), in the contact state, the cam roller 42a contacts the rotating sleeve SL between the small diameter portion 42a1 and the large diameter portion 42a2, and the switching portion 43c of the lever member 43 is in a horizontal position (parallel to the installation surface) along the front-rear direction. In this state, the other end SP2b is located higher than the one end SP2a, and the elastic force of the second coil spring SP2 acts to open the gap between the one end SP2a and the other end SP2b, that is, to lengthen the length between the one end SP2a and the other end SP2b. Therefore, the second coil spring SP2 applies a biasing force to the switching portion 43c in a direction to rotate it upward about the camshaft insertion portion 43a fixed to the camshaft 42b as a fulcrum, but the switching portion 43c interferes with the lever interference plate 46d from below, or the lever interference plate 46d interferes with the switching portion 43c from above so that the switching portion 43c does not fully extend, so that the switching portion 43c does not rotate upward any further. In addition, as a biasing force acts on the switching portion 43c to rotate it upward, a force acts on the cam roller 42a to rotate it counterclockwise via the camshaft insertion portion 43a in Figures 7(a) and 8(a).

[0044] In this contact state, when the rotating sleeve SL is rotated in the opening direction D1 via the arm 34L (rotating shaft 44), the cam roller 42a tends to rotate clockwise in response to the rotating sleeve SL. That is, the cam roller 42a tends to rotate toward the small diameter portion 42a1 side as viewed from the contact position with the rotating sleeve SL, in other words, toward the side where a gap is likely to be generated between the cam roller 42a and the rotating sleeve SL. This allows the arm 34L (rotating shaft 44, rotating sleeve SL) to rotate in the opening direction D1. While the rotating sleeve SL rotates in the opening direction, the cam roller 42a tends to rotate counterclockwise due to the biasing force of the second coil spring SP2, so that the contact state is maintained while sliding on the outer circumferential surface of the rotating sleeve SL without rotating clockwise in response to the rotating sleeve SL.

[0045] On the other hand, when the rotating sleeve SL is rotated in the closing direction D2 via the arm 34L (rotating shaft 44), the cam roller 42a tries to rotate counterclockwise in response to the rotating sleeve SL. That is, the cam roller 42a tries to rotate toward the large diameter portion 42a2 side as viewed from the contact position with the rotating sleeve SL. Therefore, when the cam roller 42a tries to rotate counterclockwise in response to the rotating sleeve SL, the outer circumferential surface of the rotating sleeve SL is pressed against the cam roller 42a, and the rotating sleeve SL becomes unable to rotate. As a result, the rotation of the rotating sleeve SL in the closing direction D2 is restricted. As described above, in the rotating mechanism 40, in the contact state, a one-way clutch acts to restrict rotation in one direction around the axis.

[0046] 7(b) and 8(b), in the separated state, the cam roller 42a is separated from the rotating sleeve SL with its small diameter portion 42a1 facing the rotating sleeve SL (a gap is generated between the rotating sleeve SL), and the switching portion 43c of the lever member 43 is in a position in which its rear side is tilted downward, and the one-way clutch is released. In this state, the other end SP2b is located lower than the one end SP2a, and a force is acting to open the gap between the one end SP2a and the other end SP2b due to the elastic force of the second coil spring SP2.

[0047] Therefore, the second coil spring SP2 applies a biasing force to the switching portion 43c in a direction to rotate downward with the camshaft insertion portion 43a fixed to the camshaft 42b as a fulcrum with respect to the switching portion 43c, but the fastening portion 43b interferes with the lever interference plate 46d from the front side, or the lever interference plate 46d interferes with the fastening portion 43b from the rear side, so that the switching portion 43c does not rotate downward any further. In this separated state, even if the rotating sleeve SL is rotated via the arm 34L (rotating shaft 44) in either the opening direction D1 or the closing direction D2, the rotating sleeve SL can be rotated in either the opening direction D1 or the closing direction D2 without being affected by the cam roller 42a because the outer circumferential surface of the rotating sleeve SL is separated from the cam roller 42a. That is, the rotating sleeve SL is allowed to rotate in either the opening direction D1 or the closing direction D2.

[0048] Next, referring to Fig. 9, the operation of the torque limiter acting in the rotation mechanism 40 will be described. As shown in Fig. 9, by tightening the tightening nut 49 in the assembly process of the rotation mechanism 40, the rotating sleeve SL is pressed against the first washer W1, the second washer W2, and the third washer W3. As a result, the rotating sleeve SL is sandwiched between the first washer W1 and the held portion 44d of the rotating shaft 44 in the left-right direction, and the frictional force (static frictional force) acting between these members causes the rotating sleeve SL to rotate around the axis together with the rotating shaft 44. The magnitude of the static frictional force acting between the rotating washer 48 and the rotating sleeve SL, and between the rotating shaft 44 and the rotating sleeve SL, can be adjusted by changing the tightening load of the tightening nut 49.

[0049] On the other hand, when the rotating sleeve SL is prevented from rotating by the outer peripheral surface of the rotating sleeve SL being pressed against the cam roller 42a in an attempt to rotate the rotating sleeve SL in the closing direction D2 via the arm 34L (rotating shaft 44) in the abutting state, the rotating shaft 44 and the arm 34L are also prevented from rotating together with the rotating sleeve SL. However, when an excessive rotational torque acts on the rotating shaft 44 and the arm 34L, in other words, when a torque equal to or greater than a predetermined torque is generated around the axis of the rotating shaft 44 and the arm 34L, the torque exceeds the static frictional force acting between the first washer W1 and the rotating sleeve SL and between the rotating shaft 44 and the rotating sleeve SL, and the rotating shaft 44 starts to slip relative to the rotating sleeve SL. As a result, only the rotating shaft 44 and the arm 34L rotate around the axis without the rotating sleeve SL rotating. In other words, the torque limiter acts.

[0050] Next, referring to Figs. 10 to 14, an operation mode when opening the arm 34L (34R) to a desired angle and when closing the opened arm 34L (34R) in the tilt mechanism TL of the projection device 10 according to this embodiment will be described. When the arm 34L (34R) is rotated in the opening direction from the closed state shown in Fig. 10 within a range of rotation angles of 5° to 80°, a one-way clutch acts on the rotation mechanism 40 because of the abutment state. For example, as shown in Fig. 11, when the operator rotates the arm 34L (34R) toward the opening direction D1 so that the rotation angle θ1 = 45°, the one-way clutch acts to allow the arm 34L (34R) to rotate in the opening direction D1, so that the arm 34L (34R) can be rotated with a light force.

[0051] On the other hand, when an operator attempts to rotate the arm 34L (34R) in the closing direction D2 after rotating it in the opening direction D1, the one-way clutch acts to restrict the rotation in the closing direction D2. Even when the rotation of the arm 34L (34R) in the closing direction D2 is restricted by the one-way clutch in this manner, if the operator attempts to rotate the arm 34L (34R) in the closing direction D2 with excessive force, the torque limiter acts on the rotation mechanism 40, and the arm 34L (34R) can be rotated in the closing direction D2.

[0052] When the operator further rotates the arm 34L (34R) from the state shown in Fig. 11 toward the opening direction D1 to a rotation angle θ2 = 80° (see Fig. 12(a)), as shown in Fig. 12(b), of the wings 48a1, 48a2 of the rotating washer 48, the wing 48a2 located on the lower side in the closed state rotates from the lower side toward the upper side, thereby approaching from below the front end portion of the switching portion 43c of the lever member 43. Then, when the operator further rotates the arm 34L (34R) from the state shown in Fig. 12 toward the opening direction to a rotation angle θ3 = 88° (see Fig. 13(a)), as shown in Fig. 13(b), one wing 48a2 that was approaching the switching portion 43c pushes up the front end portion of the switching portion 43c (wing 48a2 interferes with the front end portion of the switching portion 43c).

[0053] As a result, the lever member 43 rotates clockwise by approximately 45° around the camshaft insertion portion 43a, and the camshaft 42b and the cam roller 42a rotate clockwise together with the lever member 43. During the rotation of the lever member 43, the gap between the second coil spring SP2 and the one end SP2a and the other end SP2b narrows, and the camshaft 42b and the cam roller 42a rotate to a position closer to the separated state than to the abutting state, in other words, when the portion of the cam roller 42a that faces the outer circumferential surface of the rotating sleeve SL is positioned closer to the small diameter portion 42a1 than to the large diameter portion 42a2, the lever member 43 is urged to a position in the separated state (a position in which the rear side of the switching portion 43c is tilted downward) by a force that tries to open the gap between the one end SP2a and the other end SP2b of the second coil spring SP2, and the lever member 43 tries to maintain this position while the one-way clutch is released.

[0054] In this manner, in the separated state in which the one-way clutch is released, the arm 34L (34R) is permitted to rotate in the opening direction D1 and the closing direction D2, and only the biasing force of the first coil spring SP1 acts on the arm 34L (34R). Therefore, in the separated state, even if the operator does not apply force to the arm 34L (34R), the biasing force of the first coil spring SP1 causes the arm 34L (34R) to rotate in the closing direction.

[0055] When the arm 34L (34R) returns in the separated state to a rotation angle θ4=15° in the closing direction (see FIG. 14(a)), as shown in FIG. 14(b), the wing 48a1, which is located on the rear side in the closed state among the wing parts 48a1 and 48a2 of the rotating washer 48, rotates from the upper side to the lower side and interferes with the front end part of the switching part 43c of the lever member 43 from above. When the operator further rotates the arm 34L (34R) in the closing direction from this state, the wing part 48a1 presses the front end part of the switching part 43c downward against the restoring force of the second coil spring SP2 (the wing part 48a1 interferes with the front end part of the switching part 43c). As a result, the lever member 43 rotates counterclockwise around the camshaft insertion part 43a as the rotation center, and the camshaft 42b and the cam roller 42a rotate counterclockwise together with the lever member 43.

[0056] As a result, the lever member 43 rotates counterclockwise by approximately 45° around the camshaft insertion portion 43a, and the camshaft 42b and the cam roller 42a rotate clockwise together with the lever member 43. During the rotation of the lever member 43, the gap between one end SP2a and the other end SP2b of the second coil spring SP2 narrows, and the camshaft 42b and the cam roller 42a rotate to a position closer to the abutting state than to the separated state, in other words, when the portion of the cam roller 42a that faces the outer circumferential surface of the rotating sleeve SL is positioned closer to the large diameter portion 42a2 than to the small diameter portion 42a1, the lever member 43 is urged to a position in the abutting state (a position in which the switching portion 43c is horizontal along the front-rear direction) by a force that tries to open the gap between the one end SP2a and the other end SP2b of the second coil spring SP2, and returns to the state shown in Figures 10(a) and 10(b), and the lever member 43 tries to maintain this position, and the one-way clutch acts again. Note that the rotation angles θ1 to θ4 are not limited to those described above and can be set to any value as long as the conditions θ1<θ2<θ3 and θ4<θ3 are satisfied.

[0057] As described above, the projection device 10 according to this embodiment includes the housing 20, the rotation shaft 44 which rotates about its axis relative to the housing 20, the arms 34R, 34L which extend in a radial direction from the rotation shaft 44 and rotate together with the rotation shaft 44 to support the housing 20 in accordance with the installation angle of the housing 20 relative to the installation surface IS, the rotating sleeve SL which is provided around the axis of the rotation shaft 44, rotates together with the rotation shaft 44, and slides relative to the rotation shaft 44 when a torque equal to or greater than a predetermined torque is generated around the axis of the rotation shaft 44, the small diameter portion 42a1, and the large diameter portion 42a2 which has a diameter larger than that of the small diameter portion 42a1. 1 and the large diameter portion 42a2, and when the cam member 42 abuts against the outer peripheral surface of the rotating sleeve SL, rotation in an opening direction D1 in which the cam member 42 is driven toward the small diameter portion 42a1 side about its axis is permitted, and a one-way clutch acts to restrict rotation in a closing direction D2 in which the cam member 42 is driven toward the large diameter portion 42a2 side about its axis, and when the cam member 42 is in a separated state where the cam member 42 is separated from the outer peripheral surface of the rotating sleeve SL, the one-way clutch is released and rotation in the opening direction D1 and the closing direction D2 is permitted.

[0058] The projection device 10 according to the present embodiment is configured as described above, so that when the rotating shaft 44 is rotated together with the rotating sleeve SL in the opening direction (when the arms 34R, 34L are opened relative to the housing 20), the cam member 42 is brought into contact with the rotating sleeve SL to operate the one-way clutch, thereby allowing the rotating shaft 44 and the rotating sleeve SL to rotate in the opening direction with a light force and restricting rotation in the closing direction, thereby allowing adjustment to a desired installation angle. On the other hand, when the rotating shaft 44 is rotated together with the rotating sleeve SL in the closing direction (when the arms 34R, 34L are closed relative to the housing 20), the cam member 42 is brought into a separated state to release the one-way clutch, allowing the rotating shaft 44 and the rotating sleeve SL to rotate in the opening direction with a light force.

[0059] Furthermore, in the projection device 10 according to this embodiment, even if the arms 34R, 34L are forcibly closed with excessive force when the one-way clutch is in operation (when a torque equal to or greater than a predetermined torque is generated around the axis of the rotation shaft 44), the rotating sleeve SL is designed to slide relative to the rotation shaft 44. Therefore, even if the rotation of the rotating sleeve SL in the closing direction is impossible (even if the rotation in the closing direction is restricted), the rotation shaft 44 can be rotated in the closing direction, the arms 34R, 34L can be closed, and damage to the arms 34R, 34L can be prevented. In this way, in this embodiment, a projection device 10 capable of adjusting the installation angle with an appropriate torque can be realized. The projection device 10 according to this embodiment can adjust the installation angle with a light force, and will not be damaged even if it is forcibly closed.

[0060] The projection device 10 also includes a rotating washer 48 that rotates together with the rotating shaft 44, and when the rotating washer 48 rotates in the opening direction D1 by a predetermined angle or more in the abutting state, the rotating washer 48 rotates the cam member 42 so that the small diameter portion 42a1 faces the outer circumferential surface of the rotating sleeve SL, transitioning to a separated state, and when the rotating washer 48 rotates in the closing direction D2 by a predetermined angle or more in the separated state, the rotating washer 48 rotates the cam member 42 so that the area between the small diameter portion 42a1 and the large diameter portion 42a2 faces the outer circumferential surface of the rotating sleeve SL, transitioning to an abutting state. According to this configuration, by including the rotating washer 48 that rotates together with the rotating shaft 44, a specific configuration can be provided for opening the arms 34R, 34L by a predetermined angle or more in the abutting state to transition the cam member 42 to a separated state, and closing the arms 34R, 34L by a predetermined angle or more in the separated state to transition the cam member 42 to an abutting state.

[0061] The projection device 10 also includes a base member 46 that rotatably holds the rotary shaft 44 and the cam member 42 in parallel with respect to the housing 20, and a lever member 43 that is provided in parallel with the rotary sleeve SL and rotates together with the cam member 42, and when the rotary washer 48 rotates in the opening direction D1 by a predetermined angle or more in the abutting state, the rotary washer 48 rotates the cam member 42 via the lever member 43 to transition to the separated state, and when the rotary washer 48 rotates in the closing direction D2 by a predetermined angle or more in the separated state, the rotary washer 48 rotates the cam member 42 via the lever member 43 to transition to the abutting state. This configuration can provide a specific configuration for transitioning the cam member 42 from the abutting state to the separated state via the rotary washer 48, and for transitioning the cam member 42 from the separated state to the abutting state via the rotary washer 48.

[0062] The projection device 10 also includes a second coil spring SP2 that biases the lever member 43 against the base member 46. When the cam member 42 is in a position closer to the contact state than the separated state, the second coil spring SP2 biases the lever member 43 in a rotational direction in which the cam member 42 is in the contact state, and when the cam member 42 is in a position closer to the separated state than the contact state, the second coil spring SP2 biases the lever member 43 in a rotational direction in which the cam member 42 is in the separated state. With this configuration, the lever member 43 is biased by the second coil spring SP2 in the rotational direction in which the contact state is reached, so that the contact state can be maintained. And, the lever member 43 is biased by the second coil spring SP2 in the rotational direction in which the separated state is reached, so that the separated state can be maintained. In this way, a specific configuration can be provided for making the lever member 43 a member for switching between the contact state and the separated state.

[0063] Furthermore, in the projection device 10, the rotating washer 48 has wing portions 48a1, 48a2 extending in the radial direction thereof, and the lever member 43 is rotated by the wing portions 48a1, 48a2 interfering with the lever member 43. According to this configuration, by arranging the lever member 43 on the rotation path of the wing portions 48a1, 48a2, it is possible to provide a specific configuration for rotating the lever member 43 by utilizing the rotating washer 48.

[0064] Furthermore, in the projection device 10, the blades 48a1, 48a2 are provided as a pair with a gap therebetween around the axis of the rotating washer 48. With this configuration, one of the pair of blades 48a1, 48a2 can be used to rotate the lever member 43 when transitioning from the contact state to the separated state, and the other can be used to rotate the lever member 43 when transitioning from the separated state to the contact state. Therefore, it is possible to realize the transition from the contact state to the separated state and the transition from the separated state to the contact state within a predetermined rotation angle range for the rotating washer 48.

[0065] The projection device 10 also includes a first coil spring SP1 that is provided around the axis of the rotation shaft 44 and biases the rotation shaft 44 in the closing direction D2. With this configuration, in a separated state in which the one-way clutch does not act, the rotation shaft 44 can be rotated in the closing direction D2 by the biasing force of the first coil spring SP1 without applying force to the arms 34R, 34L. That is, a configuration can be realized in which the arms 34R, 34L automatically close in the separated state.

[0066] Furthermore, in the projection device 10, the cam member 42 has a shape in which the diameter between the small diameter portion 42a1 and the large diameter portion 42a2 smoothly and gradually increases from the small diameter portion 42a1 to the large diameter portion 42a2. According to this configuration, when the outer circumferential surface of the rotating sleeve SL is pressed against the cam roller 42a in the abutting state to restrict the rotation of the rotating sleeve SL in the closing direction D2, the outer circumferential surface of the rotating sleeve SL is gradually pressed against the cam roller 42a. Therefore, it is possible to prevent or suppress the occurrence of rattling when the rotation of the rotating sleeve SL in the closing direction D2 is restricted.

[0067] Furthermore, in the projection device 10, the rotating shaft 44, the arms 34R, 34L, the rotating sleeve SL, the rotating washer 48, and the cam member 42 are provided on both end edge sides constituting the opposite sides of the housing 20, respectively, and the arms 34R, 34L are provided in a form that connects the pair of rotating shafts 44. According to this configuration, the arms 34R, 34L can support the housing 20 on both end edge sides constituting the opposite sides of the housing 20, and the housing 20 can be stably supported at any installation angle.

[0068] Furthermore, in the projection device 10, the housing 20 has a projection port opening 23a. This makes it possible to realize a projection device 10 that is compact and has a simple configuration and is capable of projecting at a desired installation angle.

[0069] In this disclosure, the phrase "at least" includes multiple combinations or numbers greater than the number indicated, unless otherwise specified, such as "at least one of A, B, and C" meaning "(A), (B), (C), (A and B), (A and C), (B and C), or (A, B and C)". Also, for example, if C is multiple, the phrase "at least one of A, B, and C" means "(A), (B), (at least one or more C), (A and B), (A and at least one or more C), (B and at least one or more C), or (A, B, and at least one or more C)". A multiple A or a multiple B are also interpreted as being treated in the same manner as above.

[0070] The terms "first", "second", and "third", etc., are applied merely for convenience in description and to distinguish one from the other, unless otherwise specified, and do not imply any other kind of ordering of the numbers (e.g., spatial, temporal, logical, etc.). The term "or" is used to refer to non-exclusive things, unless otherwise specified, such as the phrase "A or B" meaning "(A but not B), (B but not A), and any of (A and B)".

[0071] The above-described embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0072] 10 Projection device 11 Projection port 20 Housing 20a Top surface 20b Bottom surface 20c Left side 20d Right side 20e Front 20f Rear 21 Upper case 22 Lower case 23 Front panel 23a Projection port opening 23b Air intake port 23c Exhaust port 24 Rear panel 25 Left side panel 25a Air intake 25b Exhaust port 26a First arm receiving groove 26b Second arm receiving groove 27 Mounting portion 27a Receiving recess 27b Mounting surface 27b1 Screw hole 34L Arm 34L1 First arm plate 34L1a Axis support hole portion 34L1b Locking recess 34L2 Second arm plate 34R Arm 34R1 First arm plate 34R2 Second arm plate 35 Screw member 36 Connection plate 40 Rotation mechanism 41 Mounting screw 42 Cam member 42C Center 42a Cam roller 42a1 Small diameter part 42a2 Large diameter part 42b Camshaft 42b1 Flat surface part 43 Lever member 43a Camshaft insertion portion 43a1 Insertion recess 43b Fastening portion 42b1 Fastening hole 43c Switching part 43c1 Spring mounting hole 44 Rotating shaft 44G1 Thread groove 44G2 Fitting groove 44a First shaft portion 44b Second shaft portion 44c 3rd shaft part 44d Held part 44e Projection 44e1 Screw hole 46 Base member 46a Bottom plate 46b Outer side plate 46b1 1st outer opening 46b2 2nd outer opening 46c Inner side plate 46c1 1st inner opening 46c2 2nd inner opening 46d Lever interference plate 47 Fastening member 48 Rotating washer 48a1 Wing part 48a2 Wing 48c Washer through hole 49 Fastening nut 50 Installation material D1 Open direction D2 Close direction H1 Mounting screw hole H2 Mounting screw hole IS Installation surface SL Rotating sleeve SL1 Sleeve through hole SP1 First coil spring SP2 Second coil spring SP1a One end SP1b other end SP2a one end SP2b Other end TL Tilt mechanism W1 First washer W2 Second washer W3 Third washer W4 Retaining ring θ1~θ4 Rotation angle

Claims

1. A housing and A rotating shaft that rotates about an axis relative to the housing; a support member extending in a radial direction from the rotation shaft and rotating together with the rotation shaft to support the housing in accordance with an installation angle of the housing with respect to an installation surface; A first rotating member provided around the rotation shaft and rotating together with the rotation shaft; a cam member having a small diameter portion and a large diameter portion having a diameter larger than that of the small diameter portion, the cam member being in contact with the first rotating member between the small diameter portion and the large diameter portion, In a first state in which the cam member is in contact with the contact surface of the first rotating member, the first rotating member is permitted to rotate about its axis in a first direction in which the cam member is driven toward the small diameter portion, and a one-way clutch acts to restrict rotation about its axis in a second direction in which the cam member is driven toward the large diameter portion, and in a second state in which the cam member is separated from the contact surface of the first rotating member, the one-way clutch is released and rotation in the first direction and the second direction is permitted. electronic equipment.

2. A second rotating member that rotates together with the rotating shaft is provided, When the second rotating member is in the first state, the second rotating member rotates in the first direction to be at a first angle or more with respect to the housing, whereby the second rotating member rotates the cam member so that the small diameter portion faces a contact surface of the first rotating member, thereby transitioning to the second state; When the second rotating member is rotated in the second direction so as to form a second angle or more with respect to the housing in the second state, the second rotating member rotates the cam member so that a portion between the small diameter portion and the large diameter portion faces a contact surface of the first rotating member, thereby transitioning to the first state.

2. The electronic device according to claim 1.

3. a base member that rotatably holds the rotation shaft and the cam member in parallel with each other with respect to the housing; a third rotating member disposed in parallel with the second rotating member and rotating together with the cam member; When the second rotation member is rotated in the first direction to be at a first angle or more with respect to the housing in the first state, the second rotation member rotates the cam member via the third rotation member to transition to the second state, When the second rotation member is rotated in the second direction to be at a second angle or more with respect to the housing in the second state, the second rotation member rotates the cam member via the third rotation member, thereby transitioning to the first state.

3. The electronic device according to claim 2.

4. an elastic member that biases the third rotating member against the base member; the elastic member biases the third rotating member in a rotation direction in which the cam member becomes the first state when the cam member is in a position closer to the first state than the second state, and biases the third rotating member in a rotation direction in which the cam member becomes the second state when the cam member is in a position closer to the second state than the first state.

4. The electronic device according to claim 3.

5. The second rotating member has a wing portion extending in a radial direction thereof, The blade portion interferes with the third rotating member, thereby rotating the third rotating member.

4. The electronic device according to claim 3.

6. The electronic device according to claim 5 , wherein the wing portion is provided as a pair spaced apart around the axis of the second rotating member.

7. The electronic device according to claim 2 , further comprising a coil spring member provided around the axis of the rotation shaft and biasing the rotation shaft in the second direction.

8. The electronic device according to claim 2 , wherein the cam member has a shape in which a diameter between the small diameter portion and the large diameter portion smoothly and gradually increases from the small diameter portion toward the large diameter portion.

9. the rotation shaft, the support member, the first rotation member, the second rotation member, and the cam member are provided on both end edge sides that define opposite sides of the housing, The support member is provided in a manner to connect the pair of rotation shafts.

3. The electronic device according to claim 2.

10. the first rotating member slides relative to the rotating shaft when a torque equal to or greater than a predetermined torque is generated around the axis of the rotating shaft; 2. The electronic device according to claim 1.

11. 11. The electronic device according to claim 1, wherein the housing is a projection device having a projection opening.

Images