Display device and electronic musical instrument

Abstract

The invention provides a display device and an electronic musical instrument including the same. The display device includes: a light source; a light guide member including an incident surface on which the light from the light source is incident, an exit surface from which the light from the light source is emitted, and an intermediate surface positioned between the incident surface and the exit surface; and a light shielding member having an inner wall surface facing at least a portion of the intermediate surface, and a connecting surface disposed on the emission surface side and connected from the inner wall surface in a direction away from the intermediate surface.

Description

Technical Field

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

[0002] In the past, a display device is known, which includes a light-guiding component that guides light from a light source incident on an incident surface and emits it from an emission surface on the opposite side of the incident surface. For example, Japanese Patent Gazette No. 2007-127909 discloses an LED display as a display device, which includes a plurality of LEDs (Light Emitting Diodes) as a plurality of light sources and a light-guiding component that guides light from the plurality of LEDs. In the LED display, a light-receiving surface (incident surface) is provided on the end surface of the light-guiding component opposite to each LED, and a display surface (emission surface) parallel to the light-receiving surface is provided on the end surface of the light-guiding component on the opposite side of the light-receiving surface. The outer periphery of the LED display is covered by a display panel (shell component). Summary of the invention

[0003] Problems to be solved by the invention

[0004] In the display device disclosed in the above-mentioned publication, light from the light source may diffuse, making it difficult to perform a desired display.

[0005] An advantage of the present invention is to provide a display device capable of performing good display and an electronic musical instrument including such a display device.

[0006] Means used to solve problems

[0007] The display device of the present invention comprises: a light source; a light-guiding component, comprising an incident surface for incident light from the light source, an exit surface for emitting light from the light source, and an intermediate surface located between the incident surface and the exit surface; and a light-shielding component, comprising an inner wall surface opposite to at least a portion of the intermediate surface, and a connecting surface arranged on the exit surface side and connected from the inner wall surface in a direction away from the intermediate surface.

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

[0009] Effects of the Invention

[0010] According to the present invention, it is possible to provide a display device capable of performing good display and an electronic musical instrument including such a display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is an overall perspective view of the electronic keyboard instrument according to the embodiment as viewed from the front side.

[0012] Figure 2This is a perspective view of the main body of the electronic keyboard instrument according to the embodiment as viewed from the front side.

[0013] Figure 3 It is an exploded perspective view of the display device, the insulating sheet, and the metal plate member according to the embodiment.

[0014] Figure 4 This is a perspective view of the light shielding case of the display device according to the embodiment as viewed from the front side.

[0015] Figure 5 This is a perspective view of the light shielding case of the display device according to the embodiment as viewed from the rear side.

[0016] Figure 6 This is a perspective view of the light guide member of the display device according to the embodiment as viewed from the front side.

[0017] Figure 7 It is a front view of a light shielding case, a light guide member, an LED substrate, an insulating sheet, and a metal plate member of a display device according to an embodiment.

[0018] Figure 8 is a longitudinal cross-sectional view of a light shielding shell, a light guide component, an LED substrate, an insulating sheet, and a metal plate component of a display device according to an embodiment of the present invention. Figure 7 Cross-sectional view of section VIII-VIII in . DETAILED DESCRIPTION

[0019] Embodiments of the present invention will be described with reference to the drawings. Figure 1 The electronic keyboard instrument (electronic musical instrument) 1 shown in the figure includes a main body 10 and a leg 100. Figure 1 As shown in FIG. 1 , the main body 10 includes: a keyboard 20 having a plurality of keys (operating elements) 22 consisting of white keys 22W and black keys 22B, arranged in a manner such that the key portions of the keys 22 are exposed; and a main body housing (shell) 30 surrounding and holding the keyboard 20. The leg 100 includes a pair of side plate members 110, a pedal frame 120, and a pedal device 130. In addition, the arrangement direction of the plurality of keys 22 of the keyboard 20 is set as the left-right direction (set Figure 1 The left side of the key 22 is the left side), and the extending direction of each key 22 is set to the front-back direction (set Figure 1 The front side of the electronic keyboard instrument is the front, and the inner side is the rear), and the up-down direction of the electronic keyboard instrument 1 is the up-down direction (set Figure 1 The description is given with the upper side as the upper side and the lower side as the lower side).

[0020] like Figure 1As shown, a pair of side plate members 110 are plate-shaped members erected on the installation surface on the left and right sides of the electronic keyboard instrument 1 with both plate surfaces facing the left and right directions, and support the main body shell 30. The pedal frame 120 connects the side plate members 110 at the lower side of each side plate member 110. The pedal device 130 is provided at the substantially central part of the pedal frame 120 in the left and right direction. In the electronic keyboard instrument 1, the main body shell 30 of the main body 10 exposed to the outside and the side plate members 110 of the leg 100 are made of wood, and have a characteristic texture.

[0021] like Figure 1 and Figure 2 As shown, when viewed from the upper and lower sides, the main housing 30 is in a horizontally long rectangular shape with the left-right direction as the longitudinal direction, and has thick plate-like components such as a front panel 32, a rear panel 33, a left baffle 34, a right baffle 35, a front top panel 36F, a rear top panel 36B and a bottom panel 37, and is in a roughly L-shaped longitudinal section when viewed from the left. Figure 2 3 shows a state where the left side guard 34 is removed. The front panel 32 is a substantially rectangular shape that is long 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 housing 30 on the lower side of the keyboard 20. A power button 32a is provided at the right end of the front panel 32 as an on / off switch of the electronic keyboard instrument 1. The rear panel 33 is a substantially rectangular shape that is long in the left-right direction, and is provided at the rear of the main body 10, and constitutes the rear surface of the main body housing 30.

[0022] The left side baffle 34 and the right side baffle 35 are both roughly rectangular in shape and long in the front-to-back direction, and are provided with a step difference roughly in the center of the front-to-back direction so that the front side is roughly the same height as the keyboard 20. The left side baffle 34 and the right side baffle 35 are respectively arranged on the left side and the right side of the main body 10, and constitute the left side surface and the right side surface of the main body shell 30. The front side top plate 36F is roughly rectangular in shape and long in the left-to-right direction, and is arranged on the front side of the upper rear side portion of the main body 10, and constitutes a part of the upper surface of the main body shell 30. The rear side top plate 36B is roughly rectangular in shape and long in the left-to-right direction, and is arranged on the rear side of the upper rear side portion of the main body 10, and constitutes a part of the upper surface of the main body shell 30. In addition, as Figure 1 and Figure 3 As shown, a volume panel 24 is provided between the keyboard 20 and the right side panel 35, and the volume panel 24 is provided with a volume button 24a for adjusting the output sound from the speaker, etc. In addition, a setting panel 26 is provided between the keyboard 20 and the left side panel 34, and various setting buttons 26a, etc. are provided.

[0023] The rear side top plate 36B is rotatably mounted relative to the rear panel 33 in a manner that the front side is open. On the lower side of the rear side top plate 36B, a cover plate 11 having a substantially rectangular plate shape that is long in the left-right direction is provided in a posture that the two plate surfaces are facing the up-down direction. On the cover plate 11, a plurality of substantially rectangular upper openings 11a that are open upward are provided 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 side top plate 36B is opened, the opening on the lower side of the rear side top plate 36B is covered by the cover plate 11, and the interior of the main body shell 30 is not visible. In addition, a music stand 36F1 is installed in the substantially central portion in the left-right direction of the front side top plate 36F. The bottom panel 37 is substantially rectangular in shape that is long in the left-right direction, is provided below the main body 10, and constitutes the lower surface of the main body shell 30.

[0024] like Figure 2 As shown, a substantially rectangular plate-shaped control (console) member 12 which is long in the left-right direction is provided on the rear side of each key 22 of the keyboard 20 with both plate surfaces facing the vertical direction. The control member 12 is provided in a position overlapping with the front end of the front side top plate 36F in the vertical direction so as to cover the rear end of each key 22 of the keyboard 20. The control member 12 is provided with various switches on the front surface, and the control member 12 makes it impossible to see the inside of the main body housing 30 from the outside of the electronic keyboard instrument 1 through the gap at the rear end of the keyboard 20. In the space provided between the keyboard 20 and the bottom plate 37, a key mechanism 39 is provided for achieving a key feel and tone close to that of a real piano when the performer presses each key 22 of the keyboard 20.

[0025] like Figure 2 As shown, the main body 10 is provided with a key cover 38 that covers the portion of the keyboard 20 that is exposed to the outside. The key cover 38 can be bent into two sections via a hinge, and can be freely accommodated in the space on the rear side of the key mechanism 39 inside the main housing 30. A handle part 14 serving as the handle part of the key cover 38 is provided between the front end of the key cover 38 and the operating part 12. In the center portion of the handle part 14, there are provided two horizontally long and roughly rectangular sound emission holes 14a that are opened in a manner that penetrates the handle part 14. In addition, in the state where the key cover 38 is accommodated in the main housing 30 ( Figure 2 In the state shown in the figure, a speaker (not shown) is provided in the space S on the rear side of the key cover 38 to emit the sound achieved by the key mechanism 39.

[0026] A metal plate member 16 (see FIG. 1 ) extending in the left-right direction is attached to the lower surface of the front top plate 36F. Figure 2 and Figure 3). The metal plate member 16 is roughly stepped from the front lower side to the rear upper side. At the front end portion of the lower side of the roughly stepped metal plate member 16, a roughly rectangular thick plate-shaped display member (display device) 40 that is long in the left-right direction is installed in a posture in which the display surface faces the front. The display member 40 is arranged between the key cover 38 and the front side top plate 36F in a configuration in which gaps are left on its upper and lower sides and open to the front side. In the electronic keyboard musical instrument 1, the sound emitted from the speaker provided in the main body housing 30 is emitted to the outside of the main body housing 30 via at least one of the four sound emission paths, namely, 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 the gaps opened on the upper and lower sides of the display member 40, and a sound emission path passing through the upper opening 11a.

[0027] Next, the effects and structure of the display unit 40, which is the main part of the present invention, will be described in detail. Figure 2 As shown, a display unit 42 having a rectangular shape and long in the left-right direction is provided at the approximately center of the front surface 40a of the display unit 40, and displays information related to the performance of the electronic keyboard instrument 1. The information related to the performance mentioned here refers to, for example, displaying a metronome function or displaying the strength of the key 22 pressed by the performer. In the center of the display unit 42, a plurality of LEDs 72 (see FIG. 1 ) as light emitting elements described later are provided. Figure 3 ) of the light display area 42a. A plurality of LEDs 72 are arranged in the left-right direction, and any LED 72 is turned on or off.

[0028] When the display unit 42 is displayed as a metronome function, first, several consecutive LEDs 72 among the plurality of LEDs 72 are lit like a block, and the other LEDs 72 are not lit. Here, corresponding to the set beat, the LEDs 72 at one end (e.g., the left end) of the lit LEDs 72 in the left-right direction are turned off, and the LEDs 72 that are adjacent to the LEDs 72 at the other end (e.g., the right end) in the left-right direction and have been turned off are turned on, and the same number of LEDs 72 are always turned on simultaneously and continuously. Then, this lighting and turning off are repeated, and on the other end side, when the turned off LEDs 72 disappear, the LEDs 72 at the other end that are lit are turned off, and the LEDs 72 that are adjacent to the LEDs 72 at one end that have been turned off are turned on, and then this lighting and turning off are repeated. That is, a plurality of continuously lit LEDs 72 appear to repeatedly reciprocate in the left-right direction in the display area 42 a in accordance with the set beat, thereby realizing a metronome function.

[0029] like Figure 3 As shown, the display component 40 includes an acrylic panel 44, a diffusion sheet 46, a light shielding shell (light shielding member) 50, a light guide member 60, and an LED substrate (substrate) 70 in order from the front side. An insulating sheet 80 is arranged on the rear side of the LED substrate 70. The above-mentioned metal plate member 16 is arranged on the rear side of the insulating sheet 80. The acrylic panel 44 is a transparent panel member in a substantially rectangular plate shape that is long in the left-right direction, and is arranged in a posture with the display surface facing forward, constituting a front surface 40a (see FIG. 4A ) of the display component 40. Figure 2 The diffuser sheet 46 is a horizontally long, generally 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 diffusing properties. The diffuser sheet 46 is attached to a portion of the front surface 50a of the light shielding shell 50 corresponding to the display unit 42.

[0030] like Figure 3 to Figure 5 As shown, the light-shielding shell 50 is a roughly rectangular plate-shaped component that is long in the left-right direction, and is made of, for example, polystyrene with black pigment added, and has light-shielding properties. The light-shielding shell 50 is arranged in a posture where the two plate surfaces including the front surface 50a are oriented in the front-to-back direction. On the front surface 50a of the light-shielding shell 50, the outer edge portion 50b located at the outer edge of the front surface 50a protrudes slightly forward than the front surface 50a, resulting in a structure in which a roughly concave recessed portion of the front surface 50a that is open to the front side is surrounded by the outer edge portion 50b. The acrylic panel 44 is embedded in the recessed front surface 50a. As shown in FIG. Figure 4 As shown in the enlarged view E2 of the display unit 42 , a frame portion 52 having a horizontally long, substantially rectangular frame shape along the shape of the display unit 42 is provided at a position corresponding to the display unit 42 in the front surface 50 a of the light shielding case 50 .

[0031] A frame-shaped first step front surface portion (front surface portion) 54 is provided on the inner side of the frame-shaped portion 52, which is slightly recessed in a step shape toward the rear side of the front surface 50a of the light-shielding shell 50. A second step front surface portion (front surface portion) 56 is provided on the inner side of the first step front surface portion 54, which is recessed in a step shape toward the rear side of the first step front surface portion 54. In this way, the front surface 50a and the outer edge portion 50b of the frame-shaped portion 52 having the first step front surface portion 54 and the second step front surface portion 56 function as a light-shielding member having a light-shielding property.

[0032] The second step difference front surface portion 56 is in contact with the display area 42a (see Figure 2) is provided at a position corresponding to the first step difference front surface portion 54, and is provided with a horizontally long and roughly rectangular emission opening portion 56a which is open in the front-to-back direction and into which a part of the light guide member 60 is inserted, and from which the light from the LED 72 is emitted. In detail, the emission opening portion 56a is provided in a manner that the opening is a rectangle with the left-right direction as the long side direction. In addition, the above-mentioned diffusion sheet 46 is pasted on the first step difference front surface portion 54. Around the emission opening portion 56a in the first step difference front surface portion 54, there is provided a pasting area (installation area) 54a for pasting the diffusion sheet 46.

[0033] like Figure 5 As shown in the enlarged view E3, on the rear side of the emission opening 56a in the rear surface 50d of the light-shielding shell 50, there is provided a cylindrical wall portion 58 extending in a square cylindrical shape from the opening end of the emission opening 56a toward the rear side. The cylindrical wall portion 58 is provided in a form extending approximately perpendicularly to the front surface 50a of the light-shielding shell 50. The cylindrical wall portion 58 includes a pair of upper and lower wall portions 58a (upper wall portion 58a1, lower wall portion 58a2) which are relatively located above and below and constitute the upper and lower walls, and a pair of left and right wall portions 58b which are relatively located on the left and right and constitute the left and right walls. In addition, as shown Figure 5 As shown, the inner side surfaces of the left and right wall portions 58b are slightly inclined outward in the vertical direction from the rear side to the front side.

[0034] like Figure 4 The enlarged image E2 and Figure 8 As shown, at the boundary between the second step front surface portion 56 and the upper and lower wall portions 58a of the cylindrical wall portion 58, an inclined surface (connecting surface) 50C (first inclined surface 50C1, second inclined surface 50C2) is provided which is inclined relative to the front surface of the second step front surface portion 56 and also inclined relative to the inner wall surface of the upper and lower wall portions 58a by performing C-shaped chamfering. The inclined surface 50C is connected from the inner wall surface 58a3 and the inner wall surface 58a4 in a direction away from the upper surface 64c and the lower surface 64d of the second plate-shaped member 64.

[0035] That is, a first inclined surface 50C1 is provided on the inner wall surface 58a3 side of the upper wall portion 58a1 and on the opening end side of the emission opening portion 56a, and a second inclined surface 50C2 is provided on the inner wall surface 58a4 side of the lower wall portion 58a2 and on the opening end side of the emission opening portion 56a. The first inclined surface 50C1 faces the opening end side of the emission opening portion 56a in the upper surface 64c of the second plate-shaped member 64 described later in the vertical direction, and the second inclined surface 50C2 faces the opening end side of the emission opening portion 56a in the lower surface 64d of the second plate-shaped member 64 described later in the vertical direction. The inclined surface 50C is an inclined surface that is inclined toward the rear inner side (the emission opening portion 56a side) from the second step front surface portion 56 to the upper and lower wall portions 58a.

[0036] Specifically, when the axial direction of the imaginary axis extending in the vertical direction along the front surface of the second step front surface portion 56 is 0° and the axial direction of the imaginary axis extending rearward is 90°, the first inclined surface 50C1 and the second inclined surface 50C2 are formed at an angle θ1 (see Figure 8 ) is inclined at approximately 45°. Furthermore, the first inclined surface 50C1 is inclined at an angle θ2 of approximately 45° with respect to the inner wall surface 58a3 of the upper wall portion 58a1, and the second inclined surface 50C2 is inclined at an angle θ2 of approximately 45° with respect to the inner wall surface 58a4 of the lower wall portion 58a2. Figure 8 As shown in FIG. 1 and FIG. 2 , when viewed from the front, the first inclined surface 50C1 and the second inclined surface 50C2 are formed from a position of the second step front surface portion 56 that does not overlap with the sticking area 54a to the upper and lower wall portions 58a.

[0037] Thus, the first inclined surface 50C1 is inclined relative to the inner wall surface 58a3 of the upper wall portion 58a1 so as to expand upward relative to the inner wall surface 58a3 of the upper wall portion 58a1 as it approaches from the vicinity of the incident surface 64b1 of the second plate-shaped member 64 to the vicinity of the emission surface 64a1, that is, to be separated from the upper surface 64c of the second plate-shaped member 64, and the second inclined surface 50C2 is inclined relative to the inner wall surface 58a4 of the lower wall portion 58a2 so as to expand downward relative to the inner wall surface 58a4 of the lower wall portion 58a2 as it approaches from the vicinity of the incident surface 64b1 of the second plate-shaped member 64 to the vicinity of the emission surface 64a1, that is, to be separated from the lower surface 64d of the second plate-shaped member 64. In addition, the inner wall surface of the upper and lower wall portions 58a may be designed so that the distance from the opposing surface of the opposing second plate-shaped member 64 becomes slightly longer as it moves forward relative to the incident surface 64b1. That is, both the inner wall surface 58a3 of the upper wall portion 58a1 and the inner wall surface 58a4 of the lower wall portion 58a2 may be inclined so as to form an angle smaller than 90° with respect to the front surface of the second step front surface portion 56 .

[0038] Returning to the description of the components constituting the display component 40, Figure 3 As shown, the LED substrate 70 is a plate-like member having a shape corresponding to the display unit 42 and a horizontally long and substantially rectangular shape, which is one size larger than the display unit 42, and is arranged with its two main surfaces including the front surface 70a facing the front-back direction. Figure 3As shown in the enlarged view E1, a plurality of LEDs (light sources) 72 are provided at a substantially central position in the vertical direction of the front surface 70a of the LED substrate 70. The plurality of LEDs 72 are arranged in parallel at equal intervals along the left-right direction (first direction), and the substantially rectangular light emitting surface faces the front side. In the present embodiment, 20 LEDs 72 are provided on the LED substrate 70. The insulating sheet 80 is a shape corresponding to the LED substrate 70, and is a horizontally long, substantially rectangular sheet component that is one size larger than the LED substrate 70 and has insulating properties. By sandwiching the insulating sheet 80 between the LED substrate 70 and the metal plate component 16, a short circuit between the LED substrate 70 and the metal plate component 16 is prevented.

[0039] like Figure 6 As shown, the light guide member 60 is made of polycarbonate or acrylic with excellent light transmittance, and has a first plate member 62 and a second plate member 64. The first plate member 62 is a plate member of a horizontally long and substantially rectangular shape, and is arranged with both plate surfaces facing the front-back direction, and the left-right dimension of the first plate member 62 is substantially equal to the left-right dimension of the emission opening 56a. The first plate member 62 is arranged to overlap the front surface 70a of the LED substrate 70 in such a manner that its plate surface is substantially parallel to the plate surface of the LED substrate 70.

[0040] The first plate-shaped member 62 includes: a plate-shaped portion 62a constituting a plate surface of the first plate-shaped member 62; a plurality of extension portions 62b slightly offset from the outer edge of the long side of the plate-shaped member 62a to the rear side in a step-like manner and extending outward (upward or downward) in a substantially rectangular plate shape; and a support portion 62c integrally connected to the second plate-shaped member 64 and supporting the second plate-shaped member 64 so that the second plate-shaped member 64 is not deformed or separated. The first plate-shaped member 62 functions as a support member for supporting the second plate-shaped member 64. The first plate-shaped member 62 and the second plate-shaped member 64 are integrally formed of the same material, so they can be manufactured more easily than molding by aligning and combining different members.

[0041] In the plate-like portion 62a of the first plate-like member 62, when the first plate-like member 62 is overlapped with the front surface 70a of the LED substrate 70, a plurality of openings (hereinafter referred to as "LED openings 62a1") each opening in a substantially rectangular shape are provided above and below the positions corresponding to the respective LEDs 72 in a manner penetrating in the front-to-back direction. The plurality of LED openings 62a1 are arranged as a group of two LED openings 62a1, with one LED 72 sandwiched therebetween and facing each other in the up-down direction (the second direction). Each LED opening 62a1 is opened in a size larger than the light emitting surface of each LED 72.

[0042] Each protruding portion 62b of the first plate-shaped member 62 is provided with a screw hole 62b1 for screwing the light guide member 60 to the front end portion 16a of the metal plate member 16 in a form where the LED substrate 70 and the insulating sheet 80 are sandwiched between the light guide member 60 and the metal plate member 16. The first plate-shaped member 62 is provided with a support portion 62c at a position where the LED opening portion 62a1 is not provided in the left-right direction. 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 of easily emitting light to the member it contacts, the first plate-shaped member 62 is supported at the support portion 62c in a manner that the second plate-shaped member 64 does not contact with members other than the first plate-shaped member 62 as much as possible.

[0043] The second plate-like member 64 is a thick plate-like member in a horizontally long and substantially rectangular shape. It is arranged with both plate surfaces facing the vertical direction, that is, in a state of standing upright relative to the plate-like portion 62a of the first plate-like member 62. The vertical dimension and the horizontal dimension are slightly smaller than the vertical dimension and the horizontal dimension of the emission opening 56a. When the first plate-like member 62 overlaps with the front surface 70a of the LED substrate 70, the second plate-like member 64 is arranged in a manner that the plate surface is substantially perpendicular to the plate surface of the LED substrate 70. The second plate-like member 64 includes: a light guide portion 64a, which constitutes the plate surface of the second plate-like member 64 and is located on the front side of the second plate-like member 64, and guides the light from the LED 72; and a light receiving portion 64b, which is located on the rear side of the second plate-like member 64 and is arranged opposite to the light emission surface of the LED 72, and receives the light from the LED 72. The upper and lower sides of the light receiving portion 64b of each LED opening 62a1 are open in the front-to-back direction.

[0044] like Figure 8 As shown, the front end face (top face) of the light-guiding portion 64a of the second plate-like member 64 is an emission face 64a1 from which the light from the LED 72 is emitted. On the other hand, the rear end face of the light-receiving portion 64b is an incident face 64b1 for the light from the LED 72 to be incident. In the second plate-like member 64, the incident face 64b1 and the emission face 64a1 constitute opposite sides, and are both arranged in a rectangular shape with the left-right direction as the long side direction. The incident face 64b1 is coplanar with the rear surface (back face) of the plate-like portion 62a of the first plate-like member 62. In this way, the first plate-like member 62 and the second plate-like member 64 are arranged in such a manner that the incident face 64b1 extends in the left-right direction between the upper and lower pair of LED openings 62a1.

[0045] When the light guide member 60 is mounted on the metal plate member 16 together with the LED substrate 70 and the insulating sheet 80, the LEDs 72 are hidden behind the second plate-shaped member 64 of the light guide member 60 when viewed from the front side. In addition, the upper surface 64c (middle surface) and the lower surface 64d (middle surface) of the second plate-shaped member 64 are smoother than the incident surface 64b1 and the emission surface 64a1. Therefore, the upper surface 64c and the lower surface 64d of the second plate-shaped member 64 are less likely to emit light propagating in the light guide portion 64a than the emission surface 64a1 because they reflect the light.

[0046] Here, the configuration of the light guide member 60 and the light shielding case 50 in the display member 40 will be described. Figure 7 and Figure 8 As shown, in a state where the light guide member 60 and the light shielding shell 50 are attached to the metal plate member 16, the light guide portion 64a is accommodated inside the cylindrical wall portion 58 in a form where the emission surface 64a1 is exposed from the emission opening portion 56a, and the upper and lower plate surfaces of the second plate-shaped member 64 are arranged in a form close to the opposing sides of the pair of upper and lower wall portions 58a of the cylindrical wall portion 58, and the right side surface and the left side surface of the second plate-shaped member 64 are arranged in a form close to the pair of left and right wall portions 58b of the cylindrical wall portion 58. Thus, substantially the entire area of ​​the outer peripheral surface of the second plate-shaped member 64 except for the emission surface 64a1 and the incident surface 64b1 is covered by the light shielding shell 50 and shielded from light. Therefore, when light from each LED 72 enters the incident surface 64b1 and is emitted from the emission surface 64a1, the electronic keyboard instrument 1 appears to be illuminated only in the display area 42a due to the effect of the inclined surface 50C described later.

[0047] In addition, if Figure 8 As shown, a thickened thick wall portion (back portion) 58c is provided on the opposite side of one side of the two plate surfaces facing the second plate-shaped member 64 (in other words, the back side of the side provided with the inclined surface 50C) in the boundary portion between the second step difference front surface portion 56 and the cylindrical wall portion 58. The surface 58c1 of the thick wall portion 58c is a surface parallel to the inclined surface 50C. Therefore, the wall thickness of the portion provided with the inclined surface 50C and the wall thickness of the portion without the inclined surface 50C in the cylindrical wall portion 58 are substantially equal, thereby ensuring the strength of the inclined surface 50C.

[0048] Next, the optical path of light emitted from each LED 72 provided on the LED substrate 70 will be described. Figure 8As shown, the light emitted from each LED 72 is incident on the incident surface 64b1 of the second plate-shaped member 64, and most of it is guided inside the second plate-shaped member 64 to reach the emission surface 64a1. On the other hand, a part of the light incident on the incident surface 64b1 of the second plate-shaped member 64 is emitted from the second plate-shaped member 64 from the upper surface 64c or the lower surface 64d of the second plate-shaped member 64 toward the outside of the second plate-shaped member 64.

[0049] A portion of the light incident on the incident surface 64b1 travels straight forward as it is, and is emitted toward the front side from the emission surface 64a1 of the light guide member 60 (hereinafter, each light path that travels straight from the incident surface 64b1 and is emitted from the emission surface 64a1 is collectively referred to as the "first light path L1") (refer to Figure 8 In addition, Figure 7 As shown, another part of the light incident on the incident surface 64b1 diffuses from the incident surface 64b1 to both sides in the upward and downward directions in the light guide portion 64a, and reaches the upper surface 64c or the lower surface 64d of the second plate-shaped member 64. A part of the light reaching the upper surface 64c or the lower surface 64d of the second plate-shaped member 64 is reflected inwardly by the two plate surfaces of the second plate-shaped member 64, and the remaining light is not reflected, but is emitted from the upper surface 64c or the lower surface 64d of the second plate-shaped member 64 toward the outside of the second plate-shaped member 64.

[0050] Of the light emitted outside the second plate-shaped member 64, a portion of the light reaches the left and right wall portions 58b of the cylindrical wall portion 58, and a portion of the light is absorbed by the cylindrical wall portion 58 and is not emitted from the display member 40, but there is light that is not absorbed by the cylindrical wall portion 58 but is reflected from the cylindrical wall portion 58. Here, in the display member having a structure in which the second step front surface portion 56 and the upper and lower wall portions 58a are directly connected without the inclined surface 50C and the thick wall portion 58c of the present embodiment, a Figure 7 As shown, the light leakage problem can be seen not only at the emitting surface 64a1 but also at the position of the area LL indicated by the single-dot chain line. In contrast, in the present embodiment, in the display component 40 provided with the inclined surface 50C and the thick wall portion 58c, no light leakage can be seen at the position of the area LL, and it is confirmed that light can be normally seen from the emitting surface 64a1.

[0051] At this time, by providing the inclined surface 50C in the light shielding shell 50, the light leaking out to the outer side of the second plate-shaped member 64 in the vertical direction does not reach the upper and lower wall portions 58a of the light shielding shell 50 but advances in a straight line. In other words, its optical path is not blocked by the upper and lower wall portions 58a but advances in a straight line and is emitted from the emission opening portion 56a to the front side (hereinafter, each optical path of the light leaking out to the outer side of the second plate-shaped member 64 in the vertical direction and advancing in a straight line and emitted from the emission opening portion 56a is collectively referred to as the "second optical path L2") (refer to Figure 8 In addition, Figure 8 , only the second optical path L2 of the light leaking out to the upper outer side of the second plate-shaped member 64 is shown, but the light leaking out to the lower outer side of the second plate-shaped member 64 is not blocked by the upper and lower wall portions 58a, but advances in a straight line in the same manner, and is emitted from the emission opening portion 56a. Since the leaked light of the second optical path L2 spreads in a substantially radial shape, it is not emitted toward a specific position such as the area LL, so the amount of light seen from a specific direction is small and is substantially difficult to be visually seen.

[0052] Here, refer to Figure 8 , it is assumed that the light shielding shell 50 is not provided with the inclined surface 50C. In this case, there is a wall extending substantially vertically from the opening end of the emission opening 56a toward the rear side in the portion where the inclined surface 50C is provided (hereinafter, the imaginary wall generated in the portion where the inclined surface 50C is provided is referred to as the "imaginary wall portion 50V"). Figure 8 As shown in the figure, the light leaking out to the outside of the second plate-shaped member 64 in the vertical direction reaches the imaginary wall portion 50V (reaches the upper and lower wall portions 58a of the light shielding shell 50), just like the assumed light path shown by the dotted arrow in the middle (hereinafter referred to as the "first assumed light path LA1") and the assumed light path shown by the dotted arrow in the middle (hereinafter referred to as the "second assumed light path LA2") . The light of the first assumed light path LA1 and the light of the second assumed light path LA2 that have reached the imaginary wall portion 50V respectively travel forward along the imaginary wall portion 50V and overlap, and are emitted toward the front side from the vicinity of the emission surface 64a1.

[0053] In this way, the plurality of lights overlapping along the imaginary wall 50V are finally focused and emitted from the vicinity of the emission surface 64a1, and thus, when the electronic keyboard instrument 1 is viewed from the front side, a problem of unwanted and unnecessary light leakage may occur in the position of the area LL located above and below the display area 42a. The longer the length of the upper and lower wall portions 58a in the front-to-back direction, the more the chance of reflection at the interface between the imaginary wall portion 50V and the air layer increases, so this situation tends to become more significant.

[0054] In contrast, in the electronic keyboard instrument 1 of the present embodiment, the light shielding case 50 is provided with an inclined surface 50C, so that the light leaking outward in the vertical direction of the second plate-shaped member 64 does not reach the upper and lower wall portions 58a, but is emitted to the outside of the emission opening portion 56a via the second optical path L2 that advances in a straight line. As described above, the light emitted from each LED is emitted to the front side from the emission opening portion 56a via a path of the first optical path L1 and the second optical path L2, so that undesirable light leakage is not visually observed on the upper and lower sides of the display area 42a, and a good lighting form is achieved in the display area 42a.

[0055] As described above, the display component 40 of the present embodiment comprises: an LED 72 as a light-emitting element; a light-guiding component 60, comprising a second plate-shaped component 64, the second plate-shaped component 64 having an incident surface 64b1 for incident light from the LED 72, an exit surface 64a1 for emitting light from the LED 72, and an upper surface 64c and a lower surface 64d located between the incident surface 64b1 and the exit surface 64a1; and a light-shielding shell 50, having an inner wall surface 58a3 and an inner wall surface 58a4 opposite to at least a portion of the upper surface 64c and the lower surface 64d, and an inclined surface 50C arranged on the exit surface 64a1 side and connected to the inner wall surface 58a3 and the inner wall surface 58a4 in a direction away from the upper surface 64c and the lower surface 64d.

[0056] In the display member 40 of the present embodiment having the above-described structure, a part of the light emitted from each LED and incident on the incident surface 64b1 is guided in the second plate-shaped member 64 and emitted from the emission surface 64a1, and another part leaks out from the upper surface 64c or the lower surface 64d of the second plate-shaped member 64 as an intermediate surface other than the emission surface 64a1 to the outside of the second plate-shaped member 64. Here, by providing the chamfered inclined surface 50C at the opening end of the emission opening 56a, the light leaking out of the second plate-shaped member 64 does not follow the path of light locally focused by the light shielding case 50, but is diffused and emitted from the emission opening 56a.

[0057] Therefore, in a display device having an imaginary wall portion 50V different from the present invention, undesired light is visually observed from the outside of the emission opening portion 56a due to the fact that a plurality of lights emitted from outside the emission surface of the light guide member to the outside of the light guide member are focused by the imaginary wall portion 50V. In contrast, in the display device 40 of the present embodiment, it is possible to suppress the light that leaks to the outside of the second plate-shaped member 64 from being focused, and achieve a good lighting form at the emission opening portion 56a. In this way, in the present embodiment, by making the shape of the light shielding shell 50 have a characteristic, it is possible to prevent undesired light from being visually observed near the emission opening portion 56a, and it is possible to achieve both lighting and light shielding while achieving a good lighting form.

[0058] In addition, in the display component 40 of the present embodiment, the chamfering process performed on the inclined surface 50C is a C-shaped chamfering process. According to this structure, space can be saved for the portion to which the chamfering process is applied, and the area to which the chamfering process is applied can be maximized. Therefore, both illumination and light shielding can be effectively achieved in the limited space near the emission opening 56a.

[0059] In addition, in the display component 40 of the present embodiment, the light shielding case 50 includes a second step front surface portion 56 having an emission opening portion 56a, and a pair of upper and lower wall portions 58a extending from the opening end of the emission opening portion 56a and facing the two plate surfaces of the second plate-like component 64, and a chamfering process is applied to the side of the boundary portion between the second step front surface portion 56 and the upper and lower wall portions 58a facing the second plate-like component 64, and a thick wall process is applied to the side of the boundary portion between the second step front surface portion 56 and the upper and lower wall portions 58a opposite to the side facing the second plate-like component 64. According to this structure, at the boundary portion between the second step wall portion 56 and the upper and lower wall portions 58a, the wall thickness of the chamfered inclined surface 50C can be made substantially equal to that of other portions, and the strength of the chamfered inclined surface 50C can be ensured.

[0060] Furthermore, in the display member 40 of the present embodiment, a diffusion sheet 46 is provided on the side where the emission surface 64a1 of the first step front surface portion 54 is exposed, and diffuses the light emitted from the emission surface 64a1. The first step front surface portion 54 includes a pasting region 54a around the emission opening 56a to which the diffusion sheet 46 is attached, and the chamfering is arranged at a position that does not overlap with the pasting region 54a in the first step front surface portion 54. Thus, by providing the inclined surface 50C formed by applying the chamfering to the vicinity of the pasting region 54a, a large area for applying the chamfering can be ensured while realizing a structure having the diffusion sheet.

[0061] In addition, in the display member 40 of the present embodiment, the LED substrate 70 has a plurality of LEDs 72 arranged in parallel in the left-right direction along the plate surface of the second plate-shaped member 64, the incident surface 64b1 and the emission surface 64a1 of the second plate-shaped member 64 and the emission opening 56a of the light shielding shell 50 are set to be a substantially rectangular shape with the left-right direction as the long side direction, and the inclined surface 50C formed by chamfering is provided on both sides of the upper and lower directions substantially orthogonal to the left-right direction at the opening end of the emission opening 56a. According to this structure, while realizing a substantially rectangular illumination form by the plurality of LEDs 72 arranged in parallel in the left-right direction, it is possible to prevent the generation of undesired light on both sides of the upper and lower sides of the emission opening 56a, and realize a better illumination form.

[0062] In addition, in the display member 40 of the present embodiment, the upper surface 64c and the lower surface 64d of the second plate-shaped member 64 are smoother surfaces than the incident surface 64b1. According to this structure, the light that is diffused toward the upper surface 64c and the lower surface 64d in the second plate-shaped member 64 and reaches the upper surface 64c and the lower surface 64d is efficiently totally reflected at the interface with the air layer and reaches the emission surface 64a1. Therefore, the light diffused in the second plate-shaped member 64 can be efficiently emitted from the emission surface 64a1, and the brightness can be improved.

[0063] The electronic keyboard instrument 1 of this embodiment is provided with a display unit 40 for displaying information related to a performance. According to this structure, the display unit 40 of this embodiment that achieves both illumination and light shielding can be used as a device for displaying, for example, a metronome function or the strength of a key 22 pressed by a performer in the electronic keyboard instrument 1. Therefore, it is possible to illuminate with a small width in the up-down direction and illuminate evenly with blurred light in the left-right direction, and it is possible to realize an electronic keyboard instrument 1 having a display unit 40 with excellent visibility and creative design.

[0064] Furthermore, the electronic keyboard instrument 1 of the present embodiment includes a metal plate 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 substrate 70 and the metal plate member 16. Thus, the display member 40 can be firmly attached to the electronic keyboard instrument 1 through the metal plate member 16, and a specific structure that can prevent a short circuit between the metal plate member 16 and the LED substrate 70 can be realized.

[0065] In the present embodiment, a structure in which the chamfered inclined surface 50C is provided at the opening end of the ejection opening 56a is shown. As a modified example, a curved surface (connected surface) curved in a concave arc shape in a direction away from the upper surface 64c and the lower surface 64d of the second plate-shaped member 64 may be provided by chamfering the opening end of the ejection opening 56a. In addition, in the present embodiment, the inclination angle of the inclined surface 50C is 45°, but it only needs to be less than 90°, and it is not limited thereto.

[0066] In addition, the light-shielding shell with the inclined surface 50C of this embodiment can also be formed by chamfering (cutting, grinding or bending) the imaginary wall portion 50V of the light-shielding shell provided with the imaginary wall portion 50V in the initial state, or it can be pre-molded by a mold corresponding to the shape of the inclined surface 50C.

[0067] In addition, the embodiments described above are provided as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other forms and can be omitted, replaced, or changed in various ways without departing from the main purpose of the invention. These embodiments and their variations are included in the scope and main purpose of the invention and are included in the invention described in the claims and their equivalents.

Claims

1. A display device, characterized in that: have: light source; a light guide member including an incident surface for incident light from the light source, an exit surface for emitting light from the light source, and an intermediate surface between the incident surface and the exit surface; and The light shielding member includes an inner wall surface facing at least a portion of the intermediate surface, and a connecting surface disposed on the emission surface side and connected from the inner wall surface toward a direction away from the intermediate surface.

2. The display device according to claim 1, wherein: The connecting surface is an inclined surface that is inclined relative to the inner wall surface so as to be separated from the intermediate surface, or a curved surface that is concavely arc-shaped in a direction separated from the intermediate surface.

3. The display device according to claim 2, wherein: The above-mentioned connected surface is the above-mentioned inclined surface; The light shielding member has a back surface portion located on the back side of the inclined surface; The back surface portion is parallel to the inclined surface.

4. The display device according to claim 1, wherein: The light shielding member has a front surface portion provided with an emission opening portion for exposing the emission surface; The connecting surface functions as a part of the emission opening.

5. The display device according to claim 4, characterized in that A diffusion sheet for diffusing light emitted from the emission surface; The front surface portion includes a mounting area for mounting the diffusion sheet; The connecting surface is arranged at a position in the front surface portion that does not overlap with the mounting area.

6. The display device according to claim 4, characterized in that The light source has a plurality of light-emitting elements; A substrate having the plurality of light emitting elements arranged in parallel in a first direction; The incident surface and the emitting surface of the light guide member and the emitting opening of the light shielding member are arranged in a substantially rectangular shape with the first direction as the long side direction; The connecting surfaces are respectively arranged on both sides of the opening end of the emission opening in a second direction substantially orthogonal to the first direction.

7. The display device according to claim 1, wherein: The intermediate surface of the light guide member is a smooth surface smoother than the emission surface.

8. An electronic musical instrument, characterized in that: have: The display device according to any one of claims 1 to 7; and Operating parts.

9. The electronic musical instrument according to claim 8, characterized in that: The display device displays information related to the performance.

10. The electronic musical instrument according to claim 8, wherein: have: a metal plate component for mounting the display device on the housing of the electronic musical instrument; and The insulating sheet is sandwiched between the display device and the metal plate member.

Images