Display device and electronic musical instrument

Abstract

To provide a display device capable of performing good display and an electronic musical instrument equipped with such a display device.SOLUTION: A display member 40 includes: an LED substrate 70 in which a plurality of LEDs 72 arranged in parallel in a right-left direction are provided; and a light guide member 60 having a first plate-like member 62 including a plurality of LED openings 62a1 opened so as to correspond to the plurality of LEDs 72 along a right-left direction on a plate surface substantially parallel to the LED substrate 70, and a second plate-like member 64 including an incidence surface 64b1 provided on an end surface on a front side of the plate surface substantially perpendicular to the LED substrate 70, and an emission surface 64a1 provided on an end surface on a back side, constituting opposite sides with the incidence surface 64b1, which guides the light from the plurality of LEDs 72 made incident on the incidence surface 64b1, and emits the light from the emission surface 64a1. The first plate-like member 62 and the second plate-like member 64 are connected so that the incidence surface 64b1 is positioned in the LED openings 62a1 along the right-left direction.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a display device and an electronic musical instrument. [Background technology]

[0002] Conventionally, there has been known a display device equipped with a light guide member that guides light from a light source incident on an incident surface and emits the light from an exit surface opposite to the incident surface. For example, Patent Document 1 discloses an LED display as a display device equipped with a plurality of LEDs (Light Emitting Diodes) as a plurality of light sources and a light guide member that guides the light from the plurality of LEDs. In this LED display, a light receiving surface (incident surface) is provided on an end surface of the light guide member facing each LED, and a display surface (exit surface) parallel to the light receiving surface is provided on an end surface of the light guide member opposite to the light receiving surface. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2007-127909 A Summary of the Invention [Problem to be solved by the invention]

[0004] In a display device such as that disclosed in the above-mentioned Patent Document 1, it may not be easy to display a desired image due to the diffusion of light from a light source.

[0005] An object of the present invention is to provide a display device capable of producing a good display, and an electronic musical instrument equipped with such a display device. [Means for solving the problem]

[0006] The display device of the present invention comprises a light-guiding member having a plurality of light sources arranged in parallel in a first direction, an incident surface for receiving light from the plurality of light sources, and an exit surface for emitting light from the incident surface, the light-guiding member having openings provided at positions along a second direction intersecting the first direction from the plurality of light sources.

[0007] Another display device of the present invention comprises a light source, a light guide plate having an incident surface for receiving light from the light source and an exit surface for emitting light from the incident surface, and a support member made of the same material as the light guide plate and having a support portion for supporting the light guide plate, wherein the support member has an opening provided at a position connected to the support portion.

[0008] The electronic musical instrument of the present invention includes the above-described display device for displaying information related to a performance. Effect of the Invention

[0009] According to the present invention, it is possible to provide a display device capable of providing a good display, and an electronic musical instrument equipped with such a display device. [Brief description of the drawings]

[0010] [Figure 1] 1 is a general perspective view of an electronic keyboard instrument according to an embodiment, as viewed from the front side; [Diagram 2] FIG. 2 is a perspective view of the main body of the electronic keyboard instrument according to the embodiment, seen from the front side, with the left arm removed. [Diagram 3] FIG. 2 is an exploded perspective view of a display member, an insulating sheet, and a metal plate member according to the embodiment. [Figure 4] FIG. 2 is a perspective view of a light guide member of the display member according to the embodiment, as viewed from the front side. [Diagram 5] FIG. 4 is a rear view of the light guide member of the display member according to the embodiment. [Figure 6] 3 is a front view of a light guide member and an LED board, an insulating sheet, and a sheet metal member of the display member according to the embodiment. FIG. [Figure 7]7 is a longitudinal cross-sectional view of the light guide member and LED board, the insulating sheet, and the sheet metal member of the display member according to the embodiment, taken along the line VII-VII in FIG. 6. [Figure 8] 8 is a cross-sectional view of the light guide member and LED board, the insulating sheet, and the sheet metal member of the display member according to the embodiment, taken along the line VIII-VIII in FIG. 6. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] An embodiment of the present invention will be described with reference to the drawings. An electronic keyboard instrument (electronic musical instrument) 1 shown in FIG. 1 includes a main body 10 and a leg 100. As shown in FIG. 1, the main body 10 includes a keyboard 20 having a plurality of keys 22 consisting of white keys 22W and black keys 22B and arranged so that the pressing parts of the keys 22 are exposed, and a main body case (housing) 30 that surrounds and holds the keyboard 20. The leg 100 includes a pair of side plate members 110, a pedal frame 120, and a pedal device 130. In the following description, the arrangement direction of the plurality of keys 22 of the keyboard 20 is the left-right direction (the left side of FIG. 1 is the left direction), the extension direction of each key 22 is the front-rear direction (the front side of FIG. 1 is the front direction), and the up-down direction of the electronic keyboard instrument 1 is the up-down direction (the upper side of FIG. 1 is the up direction).

[0012] 1, the pair of side plate members 110 are plate-like members that are erected on the installation surface on both the left and right sides of the electronic keyboard instrument 1 with both plate surfaces facing in the left-right direction, and support the main body case 30. The pedal frame 120 connects the side plate members 110 below each other. The pedal device 130 is provided in approximately the center of the pedal frame 120 in the left-right direction. In the electronic keyboard instrument 1, the main body case 30 of the main body 10 that is exposed to the outside and each side plate member 110 of the leg portion 100 are each made of wood, giving them a distinctive texture.

[0013] As shown in Figs. 1 and 2, the main body case 30 is a horizontally elongated, generally rectangular shape with the left-right direction as viewed from above and below, and includes thick plate-like members, such as a front panel 32, a rear panel 33, a left arm 34, a right arm 35, a front top panel 36F, a rear top panel 36B, and a bottom panel 37, and has a generally L-shaped vertical section as viewed from the left. Fig. 2 shows the state in which the left arm 34 has been removed. The front panel 32 is a generally rectangular shape that is elongated in the left-right direction, and constitutes the lower part of the front end of the main body 10 and constitutes the front surface of the main body case 30 below the keyboard 20. A power button 32a that is an on / off switch for the electronic keyboard instrument 1 is provided at the right end of the front panel 32. The rear panel 33 is a generally rectangular shape that is elongated in the left-right direction, and is provided at the rear of the main body 10 to constitute the rear surface of the main body case 30.

[0014] The left arm 34 and the right arm 35 are both substantially rectangular in shape and elongated in the front-rear direction, and a step is provided in the substantially central portion in the front-rear direction so that the front side is at substantially the same height as the keyboard 20. The left arm 34 and the right arm 35 are provided on the left and right sides of the main body 10, respectively, and form the left and right sides of the main body case 30. The front top plate 36F is substantially rectangular in shape and elongated in the left-right direction, and is provided on the front side of the upper rear part of the main body 10, and forms a part of the top surface of the main body case 30. The rear top plate 36B is substantially rectangular in shape and elongated in the left-right direction, and is provided on the rear side of the upper rear part of the main body 10, and forms a part of the top surface of the main body case 30. As shown in FIG. 1 and FIG. 3, a volume panel section 24 on which a volume knob 24a and the like for adjusting the output sound from the speaker are arranged is provided between the keyboard 20 and the right arm 35. In addition, a setting panel section 26 on which various setting buttons 26a and the like are arranged is provided between the keyboard 20 and the left arm 34.

[0015] The rear top panel 36B is attached to the rear panel 33 so as to be rotatable so that the front side opens. A cover plate 11, which is substantially rectangular and elongated in the left-right direction, is provided on the lower side of the rear top panel 36B with both plate surfaces facing the up-down direction. The cover plate 11 is provided with a plurality of substantially rectangular upper openings 11a that open upward at intervals in the left-right direction. The upper surface and side surfaces of the cover plate 11 are covered with a saran net. When the rear top panel 36B is open, the openings on the lower side of the rear top panel 36B are covered by the cover plate 11 so that the inside of the main body case 30 cannot be seen. In addition, a music stand 36F1 is attached to the front top panel 36F at approximately the center in the left-right direction. The lower panel 37 is substantially rectangular and elongated in the left-right direction, and is provided below the main body part 10 to form the lower surface of the main body case 30.

[0016] As shown in FIG. 2, a console member 12, which is a substantially rectangular plate long in the left-right direction, is provided behind each key 22 of the keyboard 20 with both plate surfaces facing up and down. The console member 12 is provided so as to cover the rear ends of each key 22 of the keyboard 20 at a position where it overlaps with the front end of the front top plate 36F in the up-down direction. Various switches are provided on the front surface of the console member 12, and the console member 12 prevents the inside of the main body case 30 from being seen from the outside of the electronic keyboard instrument 1 through the gap at the rear end of the keyboard 20. A key pressing mechanism 39 is provided in the space between the keyboard 20 and the lower plate 37 to realize a key pressing sensation and tone similar to that of a real piano when a player presses each key 22 of the keyboard 20.

[0017] As shown in FIG. 2, the main body 10 is provided with a key cover 38 that covers the part of the keyboard 20 that is exposed to the outside. The key cover 38 can be folded in two via a hinge, and is stored in a space behind the key pressing mechanism 39 inside the main body case 30 so as to be freely inserted and removed. A handle member 14 that is a handle part of the key cover 38 is provided between the front end of the key cover 38 and the console member 12. Two horizontally elongated, substantially rectangular sound emission holes 14a that open so as to penetrate the handle member 14 are provided in a central part of the handle member 14. In addition, a speaker (not shown) that emits sounds realized by the key pressing mechanism 39 is provided in a space S provided behind the key cover 38 when the key cover 38 is stored in the main body case 30 (as shown in FIG. 2).

[0018] A sheet metal member 16 extending in the left-right direction is attached to the lower surface of the front top plate 36F (see Figs. 2 and 3). The sheet metal member 16 is formed in a substantially stepped shape from the lower front side to the upper rear side. A display member (display device) 40 in the form of a substantially rectangular thick plate elongated in the left-right direction is attached to the front end of the lower side of the substantially stepped sheet metal member 16 with the display surface facing forward. The display member 40 is provided between the key cover 38 and the front top plate 36F with gaps opening to the front side on both the upper and lower sides. In the electronic keyboard instrument 1, the sound emitted from the speaker provided in the main body case 30 is emitted to the outside of the main body case 30 via at least one of the following four sound emission paths: a sound emission path passing through the gaps between the keys 22 of the keyboard 20, a sound emission path passing through each sound emission hole 14a, a sound emission path passing through gaps opening on both the upper and lower sides of the display member 40, and a sound emission path passing through the upper opening 11a.

[0019] Next, the function, effect and configuration of the display member 40, which is a main part of the present invention, will be described in detail. As shown in Fig. 2, a substantially rectangular display section 42 that is long in the left-right direction and displays information related to the performance of the electronic keyboard instrument 1 is provided at a substantially central part of the front surface 40a of the display member 40 in the left-right direction. Displaying information related to the performance here means, for example, displaying a metronome function or displaying the strength of the key pressing value of the key 22 pressed by the performer. A display area 42a is provided at the center of the display section 42, where light from a plurality of LEDs 72 (see Fig. 3), which will be described later, is displayed. The plurality of LEDs 72 are arranged in a left-right direction, and any one of the LEDs 72 is turned on or off.

[0020] When the display unit 42 displays the metronome function, first, among the plurality of LEDs 72, some consecutive LEDs 72 are lit as one cluster, and the other LEDs 72 are in a non-lit state. Here, in accordance with the set store, among the lit LEDs 72, the LED 72 at one end in the left-right direction (for example, the left end) is turned off, and among the lit LEDs 72, the LED 72 that was turned off adjacent to the LED 72 at the other end in the left-right direction (for example, the right end) is turned on, so that the same number of LEDs 72 are always continuously lit at the same time. This lighting and turning off is repeated, and when there are no more unlit LEDs 72 at the other end, the other lit LED 72 is turned off, and among the lit LEDs 72, the LED 72 that was turned off adjacent to the LED 72 at one end is turned on, and this lighting and turning off is repeated. That is, some consecutive lit LEDs 72 are seen as if they are repeatedly moving back and forth in the left-right direction in the display area 42a in accordance with the set tempo, and the metronome function is realized.

[0021] As shown in FIG. 3, the display member 40 includes, in order from the front side, an acrylic panel 44, a diffusion sheet 46, a light-shielding case (light-shielding member) 50, a light-guiding member 60, and an LED board (board) 70. An insulating sheet 80 is disposed behind the LED board 70. The above-mentioned sheet metal member 16 is disposed behind the insulating sheet 80. The acrylic panel 44 is a transparent panel member having a substantially rectangular plate shape that is long in the left-right direction, and is disposed with the display surface facing forward, constituting the front surface 40a of the display member 40. The diffusion sheet 46 is a horizontally elongated substantially rectangular sheet member having a shape and size corresponding to the display unit 42, and is made of, for example, PET (polyethylene terephthalate), and has light diffusion properties. The diffusion sheet 46 is attached to a portion of the front surface 50a of the light-shielding case 50 that corresponds to the display unit 42.

[0022] The light-shielding case 50 is a member in the shape of a substantially rectangular plate elongated in the left-right direction, and is made of, for example, black polystyrene, and has light-shielding properties. The light-shielding case 50 is disposed in a position in which both plate surfaces face the front-rear direction. The outer edge of the front surface 50a of the light-shielding case 50 protrudes slightly forward, forming a substantially concave recess 50b that is open to the front side. The acrylic panel 44 is fitted into the recess 50b. As shown in the enlarged view E1 of FIG. 3, a frame-shaped portion 52 having a horizontally elongated substantially rectangular frame shape that conforms to the shape of the display portion 42 is provided at a position on the front surface 50a of the light-shielding case 50 corresponding to the display portion 42. In addition, a horizontally elongated substantially rectangular emission opening 52a is provided at a position corresponding to the display area 42a inside the frame-shaped portion 52, into which a part of the light-guiding member 60 is inserted and through which light from the LED 72 is emitted.

[0023] The LED board 70 is a horizontally elongated, substantially rectangular, plate-like member having a shape corresponding to the display unit 42 and a size slightly larger than the display unit 42, and is disposed in a posture in which both plate surfaces face the front-rear direction. As shown in the enlarged view E2 of FIG. 3, a plurality of LEDs (light source) 72 is provided at a substantially central position in the vertical direction on the front surface 70a of the LED board 70. The plurality of LEDs 72 are arranged in parallel at equal intervals along the left-right direction (first direction), and a substantially rectangular light emitting surface (light emitting surface) faces the front side. In this embodiment, 20 LEDs 72 are provided on the LED board 70. The insulating sheet 80 is a horizontally elongated, substantially rectangular, sheet-like member having a shape corresponding to the LED board 70 and a size slightly larger than the LED board 70, and has insulating properties. The insulating sheet 80 is sandwiched between the LED board 70 and the sheet metal member 16 to prevent a short circuit between the LED board 70 and the sheet metal member 16.

[0024] Next, the configuration of the light guide member 60 will be described in detail. As shown in Fig. 4 and Fig. 5, the light guide member 60 is made of polycarbonate or acrylic having excellent light transmissivity, and has a first plate-like member (support member) 62 and a second plate-like member (light guide plate) 64. The first plate-like member 62 is a plate-like member having a horizontally elongated, substantially rectangular shape, and is disposed with both plate surfaces facing the front-rear direction, and the left-right dimension is substantially equal to the left-right dimension of the emission opening 52a. The first plate-like member 62 is disposed overlapping the front surface 70a of the LED substrate 70 so that the plate surface of the first plate-like member 62 is substantially parallel to the plate surface of the LED substrate 70.

[0025] The first plate-like member 62 includes a plate-like portion 62a constituting its plate surface, a plurality of protruding portions 62b that protrude outward (upward or downward) in a substantially rectangular plate shape, slightly offset from the outer edge of the long side of the plate-like portion 62a toward the rear in a stepped manner, and a support portion 62c (see FIG. 6) that is integrally connected to the second plate-like member 64 and prevents the second plate-like member 64 from being deformed or separated. The first plate-like member 62 functions as a support member that supports the second plate-like member 64. The first plate-like member 62 and the second plate-like member 64 are integrally molded from the same material, and therefore can be manufactured more easily than by aligning and combining separate members.

[0026] A plurality of openings (hereinafter referred to as "LED openings 62a1") each having a substantially rectangular shape are provided penetrating the plate-shaped portion 62a of the first plate-shaped member 62 in the front-rear direction above and below positions corresponding to each LED 72 when the first plate-shaped member 62 is superimposed on the front surface 70a of the LED substrate 70. The plurality of LED openings 62a1 are arranged as a pair of LED openings 62a1, sandwiching one LED 72 therebetween, and corresponding to each other along the up-down direction (second direction).

[0027] In the LED openings 62a1, the corners located at both ends of the lower side of the upper LED opening 62a1 and the corners located at both ends of the upper side of the lower LED opening 62a1, which are located closer to the LED 72, are each opened at approximately 90°. In contrast, the corners located at both ends of the upper side of the upper LED opening 62a1 and the corners located at both ends of the lower side of the lower LED opening 62a1, which are located away from the LED 72, are each opened to be curved and rounded. Therefore, strictly speaking, the linear length of the lower side of the upper LED opening 62a1 is slightly longer than the linear length of the upper side of the upper LED opening 62a1, and the linear length of the upper side of the lower LED opening 62a1 is slightly longer than the linear length of the lower side of the lower LED opening 62a1.

[0028] Each LED opening 62a1 is opened with a size larger than the light emission surface of each LED 72. That is, the opening dimension D1 (see FIG. 6) of each LED opening 62a1 in the left-right direction is, for example, 6 mm, which is larger than the vertical and left-right dimensions of the light emission surface of each LED 72. The interval D2 (see FIG. 6) between adjacent LED openings 62a1 in the left-right direction is, for example, 6.4 mm. Each protruding portion 62b of the first plate-like member 62 is provided with a screw hole 62b1 for screwing the light guide member 60 to the front end portion 16a of the sheet metal member 16 in a state in which the LED substrate 70 and the insulating sheet 80 are sandwiched between the light guide member 60 and the sheet metal member 16.

[0029] In addition, the first plate-shaped member 62 is provided with support portions 62c in the left-right direction at positions corresponding to the interval D2 where the LED openings 62a1 are not provided. The first plate-shaped member 62 is a member that supports the second plate-shaped member 64 that protrudes forward. Since the second plate-shaped member 64 has a characteristic that makes it easy to emit light to members that it is in contact with, the first plate-shaped member 62 supports the second plate-shaped member 64 at the support portions 62c so that the second plate-shaped member 64 does not come into contact with members other than the first plate-shaped member 62 as much as possible.

[0030] The second plate-like member 64 is a thick plate-like member having a horizontally elongated, generally rectangular shape, and is arranged with both plate surfaces facing the vertical direction, that is, in a state where it stands upright relative to the plate-like portion 62a of the first plate-like member 62, and its vertical and horizontal dimensions are slightly smaller than those of the emission opening 52a. The second plate-like member 64 is arranged so that its plate surface is approximately perpendicular to the plate surface of the LED substrate 70 when the first plate-like member 62 is superimposed on the front surface 70a of the LED substrate 70. The second plate-like member 64 includes a light guide portion 64a that constitutes its plate surface and is located in front of the LED 72 to guide light from the LED 72, and a light receiving portion 64b that is located behind the light guide portion 64a and faces the light emission surface of the LED 72 to receive light from the LED 72. Each LED opening 62a1 is opened in the front-rear direction on both the top and bottom sides of the light receiving portion 64b.

[0031] The front end surface (top surface) of the light guide portion 64a of the second plate-shaped member 64 is an exit surface 64a1 through which light from the LED 72 is emitted. On the other hand, the rear end surface of the light receiving portion 64b is an entrance surface 64b1 through which light from the LED 72 is incident. In the second plate-shaped member 64, the entrance surface 64b1 and the exit surface 64a1 form opposite sides. The entrance surface 64b1 is flush with the rear surface (rear surface) of the plate-shaped portion 62a of the first plate-shaped member 62. In this way, the first plate-shaped member 62 and the second plate-shaped member 64 are provided such that the entrance surface 64b1 extends along the left-right direction between a pair of upper and lower LED openings 62a1.

[0032] The exit surface 64a1 is a rough surface that is rougher than the entrance surface 64b1. Specifically, the exit surface 64a1 is textured to have fine irregularities. The upper surface 64c and the lower surface 64d (see FIG. 7) of the second plate-like member 64 are smoother than the entrance surface 64b1. Specifically, the upper surface 64c and the lower surface 64d are glossy surfaces that have glossiness due to being glossy. For this reason, the exit surface 64a1 is more likely to emit light propagated in the light guiding portion 64a to the outside of the light guiding portion 64a than the upper surface 64c and the lower surface 64d, and the upper surface 64c and the lower surface 64d are more difficult to emit light propagated in the light guiding portion 64a to the outside of the light guiding portion 64a than the exit surface 64a1 because they reflect the light propagated in the light guiding portion 64a. Moreover, the axial direction (front-rear direction) of an imaginary line connecting the emission surface 64a1 and the incidence surface 64b1 of the second plate-shaped member 64 intersects with the up-down direction (second direction) so as to be perpendicular thereto.

[0033] In addition, a wall portion (not shown) is provided on the rear side of the light-emitting opening 52a of the light-shielding case 50, which extends from the opening end of the light-emitting opening 52a toward the rear side in a square tube shape. The inner surface of this wall portion has a shape substantially the same as the outer shape of the light-guiding portion 64a, and is one size larger than the light-guiding portion 64a. When the light-guiding member 60 is assembled to the light-shielding case 50, the light-guiding portion 64a is housed inside the wall portion with the light-emitting surface 64a1 exposed from the light-emitting opening 52a, and most of the outer peripheral surface (upper surface 64c, lower surface 64d, right side surface, left side surface) of the second plate-like member 64 except for the light-emitting surface 64a1 and the light-incident surface 64b1 is covered by the light-shielding case 50 and is light-shielded. Therefore, when light from each LED 72 is incident on the light-incident surface 64b1 and emitted from the light-emitting surface 64a1, only the display area 42a is visually recognized as being illuminated when the electronic keyboard instrument 1 is viewed from the front side.

[0034] Here, the arrangement of the LEDs 72 and the light guide member 60 in the display member 40 will be described. As shown in FIG. 6, when the light guide member 60 is attached to the sheet metal member 16 together with the LED substrate 70 and the insulating sheet 80, the LEDs 72 are hidden behind the second plate-like member 64 of the light guide member 60 when viewed from the front side. That is, the vertical dimension of each LED 72 is smaller than the vertical dimension D3 of the second plate-like member 64. The vertical dimension D3 of the second plate-like member 64 is, for example, 2.5 mm. The intervals D4 between each LED 72 and the left opening end of each LED opening 62a1 and between each LED 72 and the right opening end of each LED opening 62a1 are both, for example, 2.6 mm. In addition, the intervals D5 between each LED 72 and the upper opening end of each LED opening 62a1 and between each LED 72 and the lower opening end of each LED opening 62a1 are both, for example, 2 mm.

[0035] Moreover, each of the protruding portions 62b of the first plate-shaped member 62 is provided in a stepped manner shifted toward the rear at an interval larger than the thickness dimension of each of the LEDs 72. Therefore, when the light guide member 60 is attached to the sheet metal member 16, the plate-shaped portion 62a is slightly spaced from the LED substrate 70, and the light emission surface of each of the LEDs 72 is close to the incident surface 64b1 of the second plate-shaped member 64 (see FIG. 7). The distance D6 between the light emission surface of each of the LEDs 72 and the incident surface 64b1 is, for example, 0.5 mm.

[0036] Next, the optical path of the light emitted from each LED 72 provided on the LED substrate 70 will be described. As shown in Fig. 7 and Fig. 8, most of the light emitted from each LED 72 is incident on the incident surface 64b1 of the light guide member 60. A part of the light incident on the incident surface 64b1 travels substantially straight forward and reaches the exit surface 64a1 of the light guide member 60 (hereinafter, each optical path that travels straight from the incident surface 64b1 and reaches the exit surface 64a1 is collectively referred to as "first optical path L1") (see the arrows shown in Fig. 7 and Fig. 8). The light that reaches the exit surface 64a1 is diffused by the exit surface 64a1 due to the embossing applied to the exit surface 64a1, and efficiently exits the exit surface 64a1. The light emitted from the emission surface 64a1 is diffused by the diffusion sheet 46 and emitted forward from the emission opening 52a with approximately uniform brightness, and can be visually recognized by the player in the display area 42a of the electronic keyboard instrument 1.

[0037] 7, another part of the light incident on the incident surface 64b1 is diffused in the light-guiding portion 64a from the incident surface 64b1 to both sides in the up-down direction, and reaches the upper surface 64c and the lower surface 64d of the second plate-shaped member 64. The light that has reached the upper surface 64c and the lower surface 64d is totally reflected inward by the upper surface 64c and the lower surface 64d due to the gloss finish applied to the upper surface 64c and the lower surface 64d, and reaches the exit surface 64a1 of the light-guiding member 60 (hereinafter, each optical path that is totally reflected by the upper surface 64c and the lower surface 64d and reaches the exit surface 64a1 is collectively referred to as the "second optical path L2") (see the arrow shown in FIG. 7).

[0038] Here, the upper surface 64c and the lower surface 64d of the second plate-shaped member 64 around each LED 72 are opened in the LED opening 62a1 and are therefore surrounded by an air layer with a refractive index lower than that of the light guide member 60. The first plate-shaped member 62 and the second plate-shaped member 64 are integrally molded from the same material, and therefore have no interface at the connection point, and therefore have the property of easily propagating light between them. For this reason, there is a risk that some of the light in the second plate-shaped member 64 propagates to the first plate-shaped member 62b without being emitted from the emission surface 64a1. However, since the first plate-shaped member 62 has the LED opening 62a1, when the light incident from the entrance surface 64b1 of the second plate-shaped member 64 reaches the upper surface 64c and the lower surface 64d of the second plate-shaped member 64, it is easily reflected at the interface with the air layer.

[0039] In other words, in a structure in which the LED openings 62a1 of the present invention are not provided around each LED 72, the light incident from the incident surface 62b1 into the second plate-like member 64 propagates in the vertical direction to the first plate-like member 62 and is diffused, resulting in a brightness per unit area in the vertical direction that is darker than that of the light-guiding member 60 of the present invention. In contrast, the light-guiding member 60 of the present invention can emit bright light efficiently in the vertical direction and with an appropriate contrast ratio with the surroundings.

[0040] 8, another part of the light incident on the incident surface 64b1 is diffused to both left and right sides from the incident surface 64b1 in the light-guiding section 64a, and reaches the exit surface 64a1 of the light-guiding member 60 (hereinafter, the optical paths diffused to both left and right sides and reaching the exit surface 64a1 are collectively referred to as the "third optical path L3") (see the arrows shown in FIG. 8). The interval between the LEDs 72 is set so that the light that reaches the exit surface 64a1 via the third optical path L3 reaches the entire area of ​​the exit surface 64a1 except for the portion located in front of each LED 72 (the portion that reaches via the first optical path L1).

[0041] As described above, the light emitted from each LED 72 reaches the exit surface 64a1 via any one of the first optical path L1, the second optical path L2, and the third optical path L3, so that the exit surface 64a1 is not brightly illuminated only in a dot-like manner at the portions located in front of each LED 72, but is also emitted from the exit surface 64a1 corresponding to the portions between the adjacent LEDs 72, and as a result, the exit surface 64a1 is uniformly illuminated with approximately equal brightness over a region in the left-right direction of the exit surface 64a1, the length of which corresponds to the number of LEDs 72 that are simultaneously lit. Therefore, in the above-mentioned metronome function, each LED 72 does not appear to be emitting light separately, but rather a single mass of light extending in the left-right direction appears to be emitting light while moving in the left-right direction, so that the tempo can be visually recognized well. In addition, when lighting at a desired brightness, the load on each LED 72 can be reduced by simultaneously lighting multiple LEDs 72 compared to the case of lighting only one LED 72.

[0042] As described above, the display member 40 of this embodiment includes an LED board 70 having a plurality of LEDs 72 arranged in parallel in the left-right direction, a first plate-like member 62 including a plurality of LED openings 62a1 that open along the left-right direction on a plate surface substantially parallel to the LED board 70 to correspond to the plurality of LEDs 72, and a second plate-like member 64 including an incident surface 64b1 provided on a front end surface of the plate surface substantially perpendicular to the LED board 70 and an exit surface 64a1 provided on a rear end surface that constitutes the opposite side to the incident surface 64b1, and a light-guiding member 60 that guides light from the plurality of LEDs 72 that is incident on the incident surface 64b1 and emits it from the exit surface 64a1, and the first plate-like member 62 and the second plate-like member 64 are connected so that the incident surface 64b1 is located within the LED opening 62a1 along the left-right direction.

[0043] In the display member 40 of the present embodiment configured as described above, most of the light emitted from each LED 72 enters the light guide member 60 from the incident surface 64b1. Since the LED openings 62a1 are provided above and below the incident surface 64b1, the light that enters the light guide member 60 and reaches the opening end of the LED opening 62a1 is reflected at the interface between the light guide member 60 and the opening end of the LED opening 62a1 and remains within the light guide member 60. This makes it possible to minimize the amount of light that is diffused and emitted in the vertical direction toward the LED opening 62a1, and can be efficiently emitted from the incident surface 64b1.

[0044] In addition, the first plate-shaped member 62 is provided with the support parts 62c formed integrally with the second plate-shaped member 64 at each portion where no LEDs 72 are arranged in the vertical direction, thereby preventing the second plate-shaped member 64 from falling off the first plate-shaped member 62. The support parts 62 are farther away from the light emission surfaces of the LEDs 72 than the opening ends of the LED openings 62a1 located in the vertical direction of adjacent LEDs 72, so that only a small amount of light, out of the light incident from the incident surface 64b1 of the light-receiving part 64b, reaches the support parts 62c and is diffused in the vertical direction via the support parts 62c.

[0045] In addition, the light diffused in the left-right direction within the second plate-like member 64 can also be emitted from the emission surfaces 64a1 between the adjacent LEDs 72 by adjusting the intervals between the LEDs 72, so that even a relatively small number of LEDs 72 can output light that spreads in the left-right direction. In this manner, in this embodiment, by providing a characteristic shape to the light guide member 60, the light emitted from each LED 72 can be efficiently incident on the second plate-like member 64 and can reach the emission surface 64a1 that is wide in the left-right direction. Therefore, it is possible to improve the brightness while suppressing the number of LEDs 72 provided on the LED substrate 70 and suppressing uneven brightness.

[0046] In addition, in the display member 40 according to this embodiment, both plate surfaces (upper surface 64c and lower surface 64d) of the second plate-shaped member 64 are smoother than the entrance surface 64b1. Specifically, the smooth entrance surface 64b1 is a surface that has been subjected to a gloss finish. With this configuration, the light that is diffused to both sides in the vertical direction in the second plate-shaped member 64 and reaches the upper surface 64c and the lower surface 64d is easily totally reflected by the gloss finish applied to the upper surface 64c and the lower surface 64d, and reaches the exit surface 64a1. Therefore, the light diffused in the second plate-shaped member 64 can effectively reach the exit surface 64a1, and the brightness can be further improved.

[0047] In the display member 40 according to this embodiment, the exit surface 64a1 of the second plate-shaped member 64 is a rougher surface than the entrance surface 64b1. Specifically, the exit surface 64a1, which is a rough surface, is textured. With this configuration, the light guided through the second plate-shaped member 64 and reaching the exit surface 64a1 is diffused by the textured surface of the exit surface 64a1, and the exit surface 64a1 can be uniformly brightened. Therefore, the luminance unevenness on the exit surface 64a1 can be effectively suppressed.

[0048] In the display member 40 according to the present embodiment, a plurality of LEDs 72 are provided on the LED substrate 70 at equal intervals in the left-right direction as a plurality of light sources, and the incident surface 64b1 in the second plate-like member 64 also extends in the left-right direction. This makes it possible to realize a specific configuration for making most of the light emitted from each LED 72 incident on the incident surface 64b1.

[0049] The electronic keyboard instrument 1 according to the present embodiment includes a display member 40 for displaying information related to a performance. With this configuration, the display member 40 according to the present embodiment, which has reduced luminance unevenness and improved luminance, can be used as a device for displaying, for example, a metronome function in the electronic keyboard instrument 1 or for displaying the strength of the key pressing value of the key 22 pressed by the performer. Therefore, the light displayed on the emission surface 64a1 can be illuminated with a small width in the vertical direction, and can be illuminated so that it is not visible as a point in the horizontal direction but is visible as a continuous light in the horizontal direction, thereby realizing an electronic keyboard instrument 1 including a display member 40 with excellent visibility and design.

[0050] Moreover, the electronic keyboard instrument 1 according to this embodiment includes a sheet metal member 16 for attaching the display member 40 to the main body case 30 of the electronic keyboard instrument 1, and an insulating sheet 80 sandwiched between the LED board 70 and the sheet metal member 16. This allows the display member 40 to be firmly attached to the electronic keyboard instrument 1 by the sheet metal member 16, and realizes a specific configuration capable of preventing a short circuit between the sheet metal member 16 and the LED board 70.

[0051] 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. For example, in the above-described embodiments, LEDs are used as light sources, but this is not limited to this, and other light sources such as organic EL elements may be used instead. In addition, in the above-described embodiments, an example in which the first plate-shaped member and the second plate-shaped member are both plate-shaped is shown, but at least one of them does not have to be plate-shaped.

[0052] In the above embodiment, the first plate-shaped member and the second plate-shaped member are integrally formed, but instead, the first plate-shaped member and the second plate-shaped member may be separated and combined so as to contact each other at the support portion. In this case, it is preferable to prevent a gap from being generated at the position where the first plate-shaped member and the second plate-shaped member contact each other. In the above embodiment, the LED opening is opened in a substantially rectangular shape in the front-rear direction, but the present invention is not limited to this, and the LED opening may be opened in a polygonal shape other than a rectangle, or in a substantially semicircular or semielliptical shape with the LED side as the diameter. In the above embodiment, the LED opening is arranged so that a pair of LED openings are opposed to each other, but the present invention is not limited to this, and only one of the pair of LED openings may be arranged to each LED. [Explanation of symbols]

[0053] 1 Electronic keyboard instrument 10 Main unit 11 Cover plate 11a Upper opening 12 Console member 14 Handle member 14a Sound emission hole 16 Sheet metal member 16a Front end 20 keys 22 keys 22B black key 22W White Keys 24 Volume Panel 24a Volume knob 26 Setting panel section 26a Setting button 30 Main unit case 32 Front Panel 32a Power Button 33 Rear plate 34 Left arm 35 Right arm tree 36B Rear side top plate 36F Front top 36F1 Music stand 37 Bottom plate 38 Key cover 39 Key pressing mechanism 40 Display member 40a Front 42 Display 42a Display area 44 Acrylic panel 46 Diffusion sheet 50 Light-shielding case 50a Front 50b Recess 52 Frame portion 60 Light guide member 62 First plate-shaped member 62a Plate-shaped portion 62a1 LED opening 62b Overhang 62b1 Screw hole 62c Support part 64 Second plate-shaped member 64a Light guide section 64a1 Output surface 64b Light receiving section 64b1 Incident surface 64c Top surface 64d Bottom surface 70 LED board 70a Front 72 LED 80 Insulation sheet 100 Leg 110 side plate member 120 pedal frame 130 Pedal device D1, D3 dimensions D2, D4, D5, D6 spacing L1 1st optical path L2 2nd optical path L3 3rd optical path S space

Claims

1. A plurality of light sources arranged in a first direction; a light guiding member having an entrance surface for receiving light from the plurality of light sources and an exit surface for emitting the light from the entrance surface, the light guiding member having openings provided at positions along a second direction intersecting with the first direction from the plurality of light sources; A display device comprising:

2. 2. The display device of claim 1, wherein the light-guiding member comprises a first plate-like member having the opening, and a second plate-like member having the incident surface at one end and the exit surface at the other end, and connected to the first plate-like member.

3. The display device according to claim 2 , wherein the second plate-like member supports the first plate-like member between the openings.

4. The display device according to claim 2 , wherein both plate surfaces of the second plate member are smoother than the incidence surface.

5. The display device according to claim 2 , wherein the emission surface of the second plate-like member is a rough surface that is rougher than the incidence surface.

6. The display device according to claim 1 , wherein two of the openings are provided for each of the plurality of light sources.

7. the second direction intersects with a direction of a line connecting the incident surface and the exit surface, The openings are arranged to sandwich each of the plurality of light sources. The display device according to claim 6.

8. The display device according to claim 2 , wherein the second plate-like member has the emission surface also provided between the plurality of light sources.

9. The light emitting surfaces of the plurality of light sources are each substantially rectangular, The opening portion is opened in a substantially rectangular shape and has a size larger than the light emitting surfaces of the plurality of light sources. The display device according to claim 1 .

10. A light source; a light guide plate having an incident surface through which light from the light source is incident and an exit surface through which the light from the incident surface is exited; a support member made of the same material as the light guide plate and having a support portion that supports the light guide plate; Equipped with The support member has an opening at a position connected to the support portion. Display device.

11. 11. An electronic musical instrument comprising the display device according to claim 1 for displaying information related to a performance.

12. a sheet metal member for attaching the display device to a housing of the electronic musical instrument; an insulating sheet sandwiched between the display device and the metal plate; 12. The electronic musical instrument of claim 11 .

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