JP5712082B2 - Lighting device and chair with lighting device - Google Patents

Description

  The present invention relates to a lighting device that irradiates light from a back side of a backrest portion of a chair to a predetermined range of a rear seat, and a chair with a lighting device including the lighting device.

  Chairs installed in multipurpose halls, school auditoriums, etc. are handy so that seated people can take notes and read books even when the venue is turned off when a projector is used. A lighting device may be installed to illuminate.

  In such an illuminating device, it is necessary to provide an irradiation range in which a seated person can take notes, read a book, and the like without inconvenience, and does not feel glare to the seated person and surrounding people.

  Therefore, in Patent Document 1, it is provided on the back of the backrest portion of the chair installed in the hall, and the light from the fluorescent lamp that is the light source is irradiated obliquely downward with a reflector, so that the armrest of the rear seat An illuminating device that can illuminate an installed fixed or movable table surface is disclosed. Further, Patent Document 2 is provided so as to be able to appear and retract on the back of the backrest portion of the chair, and when it appears, it illuminates the hand of the rear seat by irradiating light from a fluorescent lamp, which is a light source, obliquely downward with a reflector. An illuminating device is disclosed.

JP 10-43001 A Japanese Utility Model Publication No. 4-131352

  By the way, the chairs installed in the hall or the like are not necessarily arranged with all the chairs aligned in the front and rear, left and right, for example, the front and rear rows may be arranged shifted in the horizontal direction or the height direction, Furthermore, the positional relationship between the seats may be shifted depending on the mounting accuracy of the chair. In other words, because the positional relationship between the chairs in the front and rear rows changes depending on the installation location and installation conditions of the chairs, the irradiation range of the lighting device that illuminates the hand of the rear seat from the back of the front seat is flexible for each lighting device (each chair). It should be adjustable.

  With regard to such points, first, Patent Document 1 describes that the irradiation range is changed by changing the arrangement of the light source and the reflection plate or adjusting the horizontal and vertical angles of the reflection plate. Has been.

  However, the light source of the cited document 1 has substantially the same outer shape as the light-transmitting window installed in the opening of the cover member, and the reflecting plate is also set to be approximately the same size. For this reason, even if the arrangement of the light source and the reflection plate is changed, the irradiation position of the light passing through the light transmitting window hardly changes. Moreover, considering that a surface light source fluorescent lamp is used as the light source, the change in the irradiation range when the position is changed becomes even smaller. That is, in the case of the configuration of the cited document 1, in order to change the irradiation range to a desired position with certainty, it is necessary to change the position of the transparent window itself by the arrangement of the chair. It is necessary to prepare a lighting device of a specification and a chair equipped with the lighting device, and the production efficiency is low and the cost is high. Furthermore, in order to adjust the horizontal and vertical angles of the reflector, it is necessary to provide a sufficient space in the rotation range in order to avoid interference with the inner surface of the cover member. Induces

  Next, Patent Document 2 describes that the irradiation range is changed in the vertical direction by adjusting the angle of the door member that pivots outward from the back plate and protrudes and retracts. Similar to the configuration, it is necessary to provide a sufficient space in the rotation range, and there is no consideration for changing the irradiation range in the left-right direction.

  The present invention has been made in consideration of the above-described problems of the prior art, and even when the positional relationship between the chairs in the front and rear rows is shifted, while suppressing the increase in size and cost of the device, It aims at providing the illuminating device which can adjust the irradiation range appropriately, and a chair with an illuminating device.

  A lighting device according to the present invention is a lighting device that is provided on the back side of a backrest portion of a chair and irradiates light to a predetermined range of a back seat of the chair, and is a base fixed to the backrest portion A member, a support member that is movable with respect to the base member and can be positioned and fixed at a predetermined position, and a light source that can be moved along with the support member and fixed with the support member. And a cover member that is fixed to at least one of the base member and the backrest portion to house the light source and is provided with an irradiation hole that allows light from the light source to pass therethrough, and the light source includes at least one It is configured by two point light sources, and is movable and positioned and fixed with respect to the base member and the cover member within a predetermined virtual plane.

  Further, the chair with a lighting device according to the present invention is a chair with a lighting device provided with a lighting device that irradiates light to a predetermined range of the backseat on the back side of the backrest, and A base member fixed to the backrest, a support member attached to the base member so as to be movable and capable of being positioned and fixed at a predetermined position, and being fixed to the support member to accompany the support member A movable light source that can be positioned and fixed, and a cover member that is fixed to at least one of the base member and the backrest portion to house the light source, and is provided with an irradiation hole through which light from the light source passes. The light source includes at least one point light source, and is movable and positioned and fixed with respect to the base member and the cover member within a predetermined virtual plane. And wherein the door.

  According to such a configuration, at least one point light source, for example, an LED light source, can be moved and positioned and fixed within a predetermined virtual plane with respect to the base member and the cover member fixed to the backrest portion. By supporting with the support member in such a state, the light from the light source can be appropriately adjusted to a desired irradiation range even when the positional relationship between the chairs in the front and rear rows is shifted. In addition, since the movement range (adjustment range) of the light source is an area along the virtual plane, the support member only needs to have a configuration for translating the light source in the direction along the virtual plane, such as a rotating structure. The structure can be simplified compared to the above, and the size and cost can be reduced. Furthermore, since the light source is a point light source, even when the position is adjusted in the range along the virtual plane, the light passes through the irradiation hole and spreads in a conical shape with high accuracy to the desired irradiation range. Can be reached.

  The virtual plane may be a plane along the backrest or the base member.

  The base member is a thin plate, and the support member is movable in the vertical direction or the left-right direction on the surface of the base member and can be positioned and fixed, and on the surface of the first member When the light source is fixed to the second member, the light source moving mechanism along the virtual plane can be realized with a simple configuration. it can.

  The cover member is provided with a power switch of the light source alongside the irradiation hole, and the illumination device has an outer surface of the cover member and an irradiation hole and a power switch formed on the outer surface exposed to the outside. It may be embedded in the backrest in a state.

  According to the present invention, the light source composed of at least one point light source can be moved in a predetermined virtual plane and can be positioned and fixed with respect to the base member and the cover member fixed to the backrest portion. Even if the positional relationship between the chairs in the front and rear rows is shifted, the light from the light source can be appropriately adjusted to a desired irradiation range. Moreover, since the adjustment range of the light source is an area along the virtual plane, the support member only needs to have a configuration for translating the light source in the direction along the virtual plane. Can be simplified, and downsizing and cost reduction are possible.

FIG. 1 is a plan view of a chair with a lighting device in which a lighting device according to an embodiment of the present invention is installed. FIG. 2 is a partial cross-sectional side view of the chair with a lighting device shown in FIG. 1. 3 is an explanatory view showing a state in which the lighting device is attached to the back plate, FIG. 3A is a side view of the lighting device, and FIG. 3B is a rear view of the back plate. 4 is a configuration diagram of the lighting device, FIG. 4A is a front view of the lighting device, and FIG. 4B is a side cross-sectional view of the lighting device. FIG. 5 is a partially cutaway exploded perspective view of the lighting device. FIG. 6 is an explanatory diagram for explaining the adjustment range of the light source.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a lighting device according to the present invention will be described in detail with reference to the accompanying drawings by giving preferred embodiments in relation to a chair provided with the lighting device.

  FIG. 1 is a plan view of a chair 12 with a lighting device in which a lighting device 10 according to an embodiment of the present invention is installed, and FIG. 2 is a partial cross-sectional side view of the chair 12 with a lighting device shown in FIG. is there. FIGS. 1 and 2 illustrate predetermined front seats 12F and rear seats 12R among chairs 12 with lighting devices arranged in a multi-purpose hall, auditorium, etc. (hereinafter also simply referred to as “chairs 12”). It is.

  As shown in FIG.1 and FIG.2, the illuminating device 10 is provided in the back side of the backrest part 14 of the chair 12 (front seat 12F), The predetermined irradiation of the chair 12 (rear seat 12R) of the back is provided. This is a spotlight for irradiating the range S (table 16 in this embodiment) with light to illuminate the hand of the seated person.

  The chair 12 (the front seat 12F and the rear seat 12R) includes a seat portion 18 for a user to sit on, a backrest portion 14 on which a seated person on the seat portion 18 leans against his back, and a seated person on his elbow. A pair of left and right armrests 20L, 20R for hanging, and a movable (retractable) or fixed table 16 protruding from the front end of one armrest 20R, are fixed on the floor surface by legs 21. . In the present embodiment, a configuration in which the seat portion 18 can be flipped up with the base end (rear end) side as a rotation shaft is illustrated, but the seat portion 18 may be a fixed type.

  In such a chair 12, the lighting device 10 is embedded in the hole 22 a of the back plate 22 constituting the back surface of the backrest portion 14 with the outer surface (back surface) exposed, and the front side of the back plate 22 is the back side of the back plate 22. It is surrounded by the cushion part 24 installed ahead.

  In the following description, the width direction of the chair 10 in FIGS. 1 and 2 is defined as the X direction (left and right direction, lateral direction), the height direction is defined as the Y direction (up and down direction), and the front and rear direction is defined as the Z direction. In the case of this embodiment, since the illuminating device 10 is installed with respect to the back plate 22, the installation direction becomes a direction along the extending direction (plane direction) of the back plate 22, and is not necessarily limited to the X direction, the Y direction, and the Z direction. In the following description, it is assumed that the extending direction of the surface constituting the back plate 22 is parallel to the X direction and the Y direction.

  FIG. 3 is an explanatory view showing a state in which the lighting device 10 is attached to the back plate 22, FIG. 3A is a side view of the lighting device 10, and FIG. 3B is a back view of the back plate 22. FIG. FIG. 4 is a configuration diagram of the lighting device 10, FIG. 4A is a front view of the lighting device 10, and FIG. 4B is a side sectional view of the lighting device 10. FIG. 5 is a partially cutaway exploded perspective view of the lighting device 10.

  As shown in FIGS. 3 to 5, the lighting device 10 includes a rectangular thin plate-like base plate (base member) 30 fixed to the back plate 22, a support member 32 attached to the back surface (rear surface) of the base plate 30, and a support. A light source unit 34 supported by the member 32, a cover member 36 that is fixed to the base plate 30 and accommodates the light source unit 34, and a power switch 38 that performs ON / OFF operation of the light source unit 34 are provided.

  The base plate 30 has a long hole 40 formed at the upper center and extending in the width direction (X direction), and a pair of vertical long holes 42 and 42 formed on the left and right sides of the long hole 40 and extending in the vertical direction (Y direction). And a thin plate made of a metal material such as stainless steel, a resin material, or the like.

  As shown in FIG. 3A, the back plate 22 is formed with a stepped hole portion 22a that gradually decreases from the front side toward the back side, for example. The base plate 30 is disposed in a large portion on the foremost side of the hole 22 a and is fixed to the back plate 22 by a fixing screw 46 that passes through the mounting hole 44. In FIG. 3A, a part of the line indicating the edge of the hole 22a is omitted for the sake of simplicity.

  The support member 32 is provided on the back side of the base plate 30 and supports the light source unit 34. The support member 32 is a plate that can move in the vertical direction on the back surface (surface) of the base plate 30 and can be positioned and fixed at a predetermined position. The first member 48 and a second member 50 having a substantially triangular prism shape that can move in the left-right direction on the back surface (front surface) of the first member 48 and can be positioned and fixed at a predetermined position. The part 34 is fixed.

  The first member 48 includes a laterally long hole 52 formed in the center and extending in the width direction (X direction), and a pair of screw holes 54 and 54 formed on both left and right sides of the laterally long hole 52. The first member 48 is fixed to the back surface side of the base plate 30 by adjusting screws 55, 55 through the long holes 42, 42 of the base plate 30 into the screw holes 54, 54. At this time, by changing the fastening position of the adjusting screw 55 and the screw hole 54 in the longitudinal direction (vertical direction) of the longitudinal hole 42, the mounting position of the first member 48 in the vertical direction (Y direction) with respect to the base plate 30 is appropriately set. Can be adjusted.

  The second member 50 has a pair of left and right screw holes 56, 56 formed in the front surface 50 a that is the surface on the first member 48 side, and a through hole 57 that penetrates from the top surface to the inclined surface 50 b on the bottom surface. The light source unit 34 is installed on the surface of the inclined surface 50b that rises toward the surface. The second member 50 is fixed to the back side of the first member 48 by adjusting screw 58, 58 through the elongated hole 52 of the first member 48 to be screwed into the screw holes 56, 56. At this time, by changing the fastening position of the adjustment screw 58 and the screw hole 56 in the longitudinal direction (left-right direction) of the laterally long hole 52, the attachment position of the second member 50 in the left-right direction (X direction) with respect to the first member 48. Can be adjusted as appropriate.

  As described above, the support member 32 can move the first member 48 in the vertical direction (Y direction) with respect to the base plate 30 and can be positioned and fixed at a predetermined position, and the second member 50 can be fixed to the first member 48. Thus, it is configured to be movable in the left-right direction (X direction) and to be positioned and fixed at a predetermined position.

  That is, as shown in FIG. 6, the support member 32 can move the light source unit 34 (light source 34 a) in a virtual plane XY parallel to the X direction and the Y direction with respect to the base plate 30 fixed to the back plate 22. In addition, it is supported so as to be positioned and fixed at a predetermined position. In other words, the position of the light source unit 34 (the light source 34a) can be adjusted within the predetermined region R along the virtual plane XY. For example, in addition to the position indicated by the irradiation direction L, the position is indicated by the irradiation directions L1 and L2. The light source 34a can be moved to a position or the like (see FIGS. 4B and 6). At this time, the long hole 40 of the base plate 30 is formed so that the top of the adjusting screw 58 disposed therein does not interfere with the outer diameter of the top so as not to interfere during the adjustment in the X and Y directions. The shape is set in consideration of the amount of adjustment in the direction (adjustment range).

  Next, the light source unit 34 is, for example, a light emitting diode (LED) light source having a light source 34 a that is at least one point light source, and the LED substrate 34 b on which the light source 34 a is installed is an inclined surface of the second member 50. By being fixed to 50b, light is irradiated obliquely downward and rearward (see FIGS. 3A and 4B), and for example, an irradiation range S is set near the table 16 of the rear seat 12R. (See FIGS. 1 and 2). Although wiring to the LED substrate 34b and the like are not shown, for example, a through hole 57 formed in the second member 50 may be inserted.

  The cover member 36 is fixed to the back surface of the base plate 30 by, for example, three fixing screws 60 (see FIG. 4), and most of the cover member 36 is embedded in the hole 22a of the back plate 22 together with other components of the lighting device 10. At the same time, only the oval outer surface 36a side is exposed to the outside (see FIG. 3). The cover member 36 is a member that houses the light source unit 34 and the support member 32 in a space formed inside the upper portion thereof and covers the light source unit 34 and the support member 32 so that they cannot be seen from the outside. The cover member 36 may be configured integrally with the base plate 30.

  The cover member 36 may be fixed to the backrest 14 by a method other than fixing to the base plate 30 with the fixing screw 60 or the like. For example, two points in FIG. As shown by a chain line, the upper and lower parts of the cover member 36 are extended to form a pair of mounting holes, and a fixing screw 61 made of, for example, wood screws is fastened to the back plate 22 through the mounting holes, thereby You may attach directly with respect to the board 22 (backrest part 14). Of course, the cover member 36 may be fixed to both the base plate 30 and the back plate 22 using the fixing screw 60 and the wood screw 61 described above. Then, since the cover member 36 also functions as a bracket for fixing the base plate 30 to the back plate 22, the attachment rigidity of the base plate 30 to the back plate 22 can be increased.

  As shown in FIG. 4 (B), the cover member 36 is formed with an irradiation hole 64 for fitting a window member 62 that transmits light from the light source 34 a on the outer surface 36 a, and below the irradiation hole 64. A switch hole 66 is formed to hold the power switch 38 in a pushable state. An annular recess 68 is formed on the inner side of the outer surface 30a of the cover member 36. The annular recess 68 prevents rattling or the like when the outer surface 30a of the cover member 36 contacts the surface of the back plate 22. A buffer member (not shown) such as an O-ring is provided.

  The window member 62 (irradiation hole 64) is formed larger than the light source 34a in order to reliably transmit (pass) light from the light source 34a whose position is adjusted along the virtual plane XY described above, Has transparency.

  That is, in the illuminating device 10, the light source 34a smaller than the window member 62 (irradiation hole 64) is provided forward (backward in the light irradiation direction) so as to be adjustable vertically and horizontally. In other words, the outer shape of the light source 34a is set smaller than the outer shape of the window member 62 (irradiation hole 64) when viewed from at least the irradiation direction L of the light from the light source 34a (see FIG. 4B). At this time, the light source 34a can be adjusted up and down and left and right within a region overlapping with the window member 62 (irradiation hole 64). In the case of the present embodiment, since the irradiation direction L of the light from the light source 34a is directed obliquely downward and rearward, the light source 34a is at a position shifted upward from the center of the window member 62 (irradiation hole 64). It is arranged on the back side. Note that the window member 62 may be omitted. In this case, the light from the light source 34a passes directly through the irradiation hole 64. However, in consideration of protection of the light source 34a, aesthetics of the lighting device 10, and the like. In some cases, it is preferable to provide a window member 62.

  As shown in FIG. 3B and FIG. 4B, the power switch 38 is a round push button operated by a seated person in the rear seat 12R using the irradiation device 10, and is operated by being manually pressed. And a detection unit 38b that is turned ON / OFF by a pushing operation in front of the operation unit 38a, and the detection unit 38b is fixed on the back surface of the base plate 30 by a fixing screw 70 or the like. Arranged. The operation unit 38a is urged in an outward projecting direction by an elastic member (not shown) provided in the detection unit 38b, and the light source 34a is turned on (ON) and turned off (by pressing the operation unit 38a). OFF).

  Next, the effect of the illuminating device 10 and the chair 12 with an illuminating device configured as described above will be described.

  In places where a large number of chairs 12 are installed, such as a multipurpose hall or a school auditorium, as shown in FIGS. 1 and 2, the front and rear rows are in the left-right direction (X direction) as in the front seat 12F and the rear seat 12R, Although it may be arranged in a state aligned in the height direction (Y direction) and the front-rear direction (Z direction), not all chairs are necessarily arranged in each direction. For example, the rear seat 12R may be disposed between the left and right front seats 12F, or the position of the rear seat 12R may be higher than the front seat 12F in a venue where the floor surface is inclined while rising rearward. Furthermore, positional deviation may occur in the front and rear rows depending on the installation accuracy of each chair 12.

  For example, at the positions of the tables 16a, 16b, 16c, and 16d indicated by the two-dot chain line in FIGS. 1 and 2, the rear seat 12R is displaced in any of the X, Y, and Z directions or in all directions with respect to the front seat 12F. Installed. In FIG. 1 and FIG. 2, for the sake of simplicity, the positional deviation of the chair 12 itself is not shown, and the positional deviation of the table 16 is indicated by a two-dot chain line to thereby indicate the positional deviation of the rear seat 12R with respect to the front seat 12F. Is illustrated.

  Therefore, in the illumination device 10 according to the present embodiment, the light source 34a (for example, an LED light source) including at least one point light source is used, and the position of the light source 34a is set in the virtual plane XY by the positioning adjustment operation by the support member 32. It is configured so that it can be adjusted vertically and horizontally (see FIG. 6).

  Accordingly, as shown in the tables 16a to 16d in FIGS. 1 and 2, even if the rear seat 12R is displaced in the X, Y, and Z directions with respect to the front seat 12F, the chair 12 By installing the light source 34a with its position adjusted in the virtual plane XY at the time of installation, the light from the light source 34a can be appropriately adjusted with respect to each of the tables 16a to 16d (two-dot chain lines in FIGS. 1 and 2). (See irradiation ranges S1, S2, S3, and S4).

  Moreover, the movement range (adjustment range) of the light source 34a is a region R along the virtual plane XY (see FIG. 6). For this reason, the support member 32 only needs to have a configuration in which the light source 34a is translated only in the X and Y directions. For example, the support member 32 can be realized with a simple configuration using the first member 48 and the second member 50 described above. Compared to the above, the structure is simplified. In particular, the size in the front-rear direction (Z direction) can be easily reduced, and the cost can be reduced.

  Further, since the light source 34a is a point light source, even when the position is adjusted in a range along the virtual plane XY, the light passes through the window member 62 (irradiation hole 64) and spreads in a conical shape. The irradiation ranges S and S1 to S4 set in the vicinity of the tables 16 and 16a to 16d are accurately reached.

  On the other hand, in the above-described prior art, since a surface light source such as a fluorescent lamp is used, even if this surface light source is moved in the vertical and horizontal directions, the position of the irradiation range hardly changes. In the prior art, it is configured such that the irradiation direction can be adjusted to some extent by imparting a rotation function to a reflector or the like, and the structure is complicated and large.

  Note that the virtual plane XY, which is the moving direction of the light source 34a, does not necessarily have to be a plane along the X direction and the Y direction. For example, a plane along the backrest portion 14 (back plate 22) or the surface of the base plate 30. In short, what is necessary is that the position adjustment of the light source 34a is performed only by parallel movement within a predetermined virtual plane.

  In the illuminating device 10, the light source 34 a is configured to be smaller than the window member 62 (irradiation hole 64), and the light source 34 a is moved on the inside thereof. Therefore, the position of the light source 34 a is adjusted by the support member 32. Even in this case, as shown in FIG. 3B, the appearance does not change, the uniformity of the entire venue where the chair 12 is installed is achieved, and the beauty of the entire venue can be ensured. . At this time, the height direction (Y direction) distance of the longitudinally long hole 42 of the base plate 30 and the lateral direction (X direction) distance of the laterally long hole 52 of the first member 48, or the top dimension of the adjusting screw 58 and the length of the elongated hole 40. Within the moving range (adjustment range) of the light source 34a defined by the inner dimensions, if the light L from the light source 34a always passes through the window member 62 (irradiation hole 64), the light source 34a is positioned during positioning. Is prevented from being accidentally detached from the window member 62 (irradiation hole 64), and the setting operation at the installation site is further facilitated.

  Furthermore, in the lighting device 10, after setting the irradiation range S (S1 to S4) by the light source 34a and installing the chair 12, the seated person simply turns on / off the power switch 38 to set the desired position at hand. Since it can illuminate, it is easy to operate and has no durability because it has no moving parts. It is particularly effective in preventing damage and the like in a hole used by an unspecified number.

  It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that the present invention can be freely changed without departing from the gist of the present invention.

  For example, in the above embodiment, as illustrated in FIG. 1, the configuration in which the lighting device 10 is installed in the center in the width direction of the back plate 22 is illustrated, but the lighting device 10 has a positional deviation of the rear seat 12R with respect to the front seat 12F, Depending on the situation, it may of course be installed near the left and right sides of the back plate 22. At this time, if the light from the light source 34a of the illuminating device 10 is set so as to irradiate the table 16 of the rear seat 12R from the right side (for example, refer to the irradiation ranges S and S1 in FIG. 1), the rear seat 12R It is possible to avoid the shadow of the right hand placed by the seated person on the table 16.

DESCRIPTION OF SYMBOLS 10 Illuminating device 12 Chair 14 Backrest part 16, 16a-16d Table 22 Back plate 30 Base plate 32 Support member 34 Light source part 34a Light source 36 Cover member 38 Power switch 48 1st member 50 2nd member 62 Window member 64 Irradiation hole

Claims (5)

An illumination device that is provided on the back side of a backrest portion of a chair and irradiates light on a predetermined range of a back seat of the chair,
A base member fixed to the backrest;
A support member attached to the base member so as to be movable and capable of being positioned and fixed at a predetermined position;
A light source that can be moved and positioned and fixed with the support member by being fixed to the support member;
A cover member that is fixed to at least one of the base member and the backrest and houses the light source, and is provided with an irradiation hole through which light from the light source passes;
With
The light source is configured by at least one point light source, and is movable and positioned and fixed with respect to the base member and the cover member within a predetermined virtual plane. The lighting device according to claim 1.
The imaginary plane is a plane along the backrest or the base member. The lighting device according to claim 1 or 2,
The base member is a thin plate,
The support member is movable in the vertical direction or the horizontal direction on the surface of the base member and can be positioned and fixed, and can be moved in the horizontal direction or the vertical direction on the surface of the first member and can be positioned and fixed. A second member,
The illumination device, wherein the light source is fixed to the second member. In the illuminating device of any one of Claims 1-3,
The cover member is provided with a power switch of the light source along with the irradiation hole,
The illuminating device is embedded in the backrest in a state where an outer surface of the cover member, an irradiation hole and a power switch formed on the outer surface are exposed to the outside. A chair with a lighting device provided with a lighting device for irradiating light to a predetermined range of the back seat on the back side of the backrest,
The lighting device includes a base member fixed to the backrest;
A support member attached to the base member so as to be movable and capable of being positioned and fixed at a predetermined position;
A light source that can be moved and positioned and fixed with the support member by being fixed to the support member;
A cover member that is fixed to at least one of the base member and the backrest and houses the light source, and is provided with an irradiation hole through which light from the light source passes;
With
The light source is constituted by at least one point light source, and is movable and positioned and fixed within a predetermined virtual plane with respect to the base member and the cover member.

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