JP6612199B2 - Light guide unit and buzzer with illumination function provided with the light guide unit - Google Patents

Description

  The present invention relates to a light guide unit, and in particular, to an improvement in the structure thereof.

  As a buzzer with an illumination function (electronic buzzer), for example, Japanese Utility Model Publication No. 59-34960 describes a buzzer body provided with a sounding device (sound generator) and a buzzer body provided with a light emitting diode on the front surface. (See FIG. 2 of the same publication).

  In the conventional configuration described above, the light emitting diode is disposed on the front surface of the buzzer body, so that the sounding device is disposed at a deep position inside the buzzer body. There is a risk of pressure drop.

  The present invention has been made in view of such a conventional situation, and a problem to be solved by the present invention is to provide a light guide unit that can improve sound pressure and emit light from the front side. is there.

A light guide unit according to the present invention is provided on the front side of the light guide unit, and includes a holding unit for holding a sounding body that generates sound, a first reflecting surface that reflects light from a light source, A second reflection surface that reflects the light reflected by the first reflection surface to the front side of the light guide unit, and a plurality of ridges provided between the first and second reflection surfaces. From the light source having a first light guide path that is reflected by the first reflecting surface, passes through the ridge, is reflected by the second reflecting surface, and is guided to the front of the light guide unit. Light is reflected by the first reflecting surface and passes through the gap between the adjacent ridges to be guided to the outer surface side of the light guiding unit . According to the present invention, since the sounding body is held by the holding portion on the front side of the light guide unit, the sound emitted from the sounding body is immediately emitted from the front side of the light guide unit to the outside. Therefore, the sound pressure can be improved. In addition, according to the present invention, the light from the light source is guided by the first and second reflecting surfaces to the front of the light guide unit through the first light guide path of the light guide unit. Light can be emitted from the front of the unit.

In the present invention, the first light guide path is configured to include a protruding portion that protrudes outward from the outer surface of the light guide unit, and the protruding portion is disposed on the outer periphery of the holding portion and the second reflection is performed. Has a surface.

Illuminated function buzzer according to the present invention, that have a light guide unit.

As described above, according to the present invention, since the sounding body is held by the holding portion on the front surface side of the light guide unit, the sound pressure of the sound emitted from the sounding body can be improved, and the light source the light from the first, since the guided toward front of the first light guide unit through the light guiding path of the light guide unit is reflected by the second reflecting surface, irradiating light from the front light guide unit it can.

It is a whole perspective view of the front side of the buzzer with an illumination function provided with the light guide unit by one example of the present invention. It is a whole perspective view of the state where the front cover was removed in the buzzer with an illumination function (FIG. 1). It is a whole perspective view of the rear surface side of the buzzer with an illumination function (FIG. 1). It is an exploded view of the buzzer with an illumination function (FIG. 1). In FIG. 4, it is an enlarged view of a body, a board | substrate unit, and a body insert. It is a whole perspective view of the front side of the said light guide unit which comprises the said buzzer with an illumination function (FIG. 1). It is a whole perspective view of the rear surface side of the said light guide unit (FIG. 6). It is a rear surface enlarged view of the said light guide unit (FIG. 7). It is the IX-IX sectional view taken on the line of FIG. It is the XX sectional view taken on the line of FIG. FIG. 9 is a longitudinal sectional view of the buzzer with illumination function (FIG. 1) corresponding to a cross section taken along the line IX-IX in FIG. 8, together with a first light guide path for guiding light from the light source to the front side of the light guide unit. Is shown. It is a longitudinal cross-sectional view of the said buzzer with an illumination function (FIG. 1) equivalent to the XX line cross section of FIG. 8, Comprising: The 2nd light guide path for guiding the light from a light source to the outer surface side of a light guide unit is combined. It is shown. It is a figure which shows the state by which the rubber cover was mounted | worn with the said buzzer with an illumination function (FIG. 1). It is a figure which shows the state by which the rubber cover was mounted | worn with the said buzzer with an illumination function (FIG. 3).

Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 to 12 are diagrams for explaining a light guide unit according to an embodiment of the present invention. Here, an example in which the light guide unit according to the present embodiment is applied to a buzzer with an illumination function is shown. In the following description, “front side (or front side / front side)” is opposite to “rear side (or rear side / rear side / back side)” which is the power cable connection side of the buzzer with illumination function. Pointing to the side.

  As shown in the front side overall perspective view of FIG. 1, the front side overall perspective view of FIG. 2 with the front cover removed from the state of FIG. 1, and the rear side overall perspective view of FIG. The body 2, the light guide unit 3 disposed on the front side of the body 2, the inner cover 4 mounted on the front side of the light guide unit 3, the front cover 5 covering the front side of the body 2, and the inside of the body 2 A board unit 6 to be inserted and mounted with electronic components, a power cable 7 for applying a power supply voltage to the board unit 6 disposed on the rear side of the body 2, and a male screw formed on the rear part of the body 2 And a lock nut 8 to be screwed.

  As shown in the exploded view of FIG. 4 and the partially enlarged view of FIG. 5, the body 2 of the buzzer 1 with an illumination function includes a front portion 20 having a large diameter and a rear portion 21 having a smaller diameter and a longer axial length. A board unit 6 on which an electronic component including an LED (light source) 60 is mounted is inserted from the front side, and a cylindrical body insert 9 is inserted from the rear side. It is supposed to be inserted. A pair of left and right guide grooves 21a are formed on the inner peripheral surface of the rear portion 21 of the body 2 so that the substrate 61 of the substrate unit 6 is slidably engaged. Similarly, on the inner peripheral surface of the body insert 9, A pair of left and right guide recesses 90a with which the rear end of the substrate 61 of the substrate unit 6 is engaged are formed. The guide groove 21a and the guide recess 90a are arranged in alignment along the axial direction. As shown in FIG. 4, a rubber washer 10 is attached to the rear portion 21 of the body 2, and the rubber washer 10 is attached to the back surface of the large-diameter portion 20. A male screw 21 b into which the lock nut 8 is screwed is formed on the rear portion 21 of the body 2.

An annular wall portion 20A extending annularly along the circumferential direction is disposed on the outer peripheral side of the front portion 20 of the body 2, and the front cover 5 is fitted to the annular wall portion 20A. The front cover 5 is subjected to a satin treatment for light diffusion such as embossing and the like, and a through hole 5a for sound emission is formed on the front surface. On the inner peripheral side of the annular wall portion 20A, annular wall portions 20B and 20C that similarly extend annularly along the circumferential direction are disposed in order toward the inner peripheral side, and between the annular wall portions 20B and 20C. Is formed with an annular groove 20c extending annularly along the circumferential direction. On the outer peripheral surface of the annular wall portion 20 </ b> C, a step portion 20 </ b> C ₁ that retreats toward the rear side is provided, and the step portion 20 </ b> C ₁ functions as a seat surface on which the O-ring 14 is seated. The rear end portion of the light guide unit 3 is inserted into the annular groove 20c.

  As shown in the exploded view of FIG. 4, the front side general perspective view of FIG. 6, and the rear side general perspective view of FIG. 7, the light guide unit 3 includes a rear cylindrical portion 30 disposed on the rear side, and a front side. For example, and each cylindrical part 30,31 and the bottom part 32 is transparent (or is transparent (or, for example). It is integrally formed of a resin (having at least translucency).

  On the rear surface side of the bottom 32 of the light guide unit 3, a small-diameter blind hole 32 </ b> B is formed at the center, and the inner periphery of the rear cylindrical portion 30 extends radially outward from the outer peripheral edge of the blind hole 32 </ b> B. A plurality (eight in this example) of convex strips 33 extending radially to the surface 30A are disposed (see FIG. 8 which is an enlarged rear view of the light guide unit 3). Each protrusion 33 has a longitudinal or longitudinal cross section in the axial direction, for example. A gap 34 having a substantially fan shape (more specifically, a trapezoidal shape in which the upper base and the lower base are, for example, concentric arcuate surfaces) is seen between the convex portions 33 adjacent to each other in the circumferential direction. Is formed. Further, two spring receiving portions 35 are provided on the rear surface side of the bottom portion 32, and each spring receiving portion 35 is formed with a through hole penetrating the bottom portion 32 in the axial direction. The conductive springs 11 are inserted respectively. The free length of the spring 11 is longer than the through hole of the spring receiving portion 35, and the front and rear ends of the spring 11 protrude outward from the front opening and the rear opening of the through hole, respectively (see FIG. 7 shows only the rear opening portion of the through hole).

  An annular groove 32C is formed on the front side of the bottom 32 of the light guide unit 3, and the packing 12 (FIG. 4) is attached to the annular groove 32C. Further, a piezoelectric diaphragm (sound generator) 13 (FIG. 4) is attached to the front side of the bottom portion 32, and the piezoelectric diaphragm 13 is elastic to the front side of the bottom portion 32 via the packing 12. Retained. Therefore, in this case, the annular groove 32 </ b> C functions as a holding portion for the piezoelectric diaphragm 13. An inner cover 4 is arranged on the front side of the piezoelectric diaphragm 13. A through hole 4 a for sound emission is formed on the front surface of the inner cover 4. The piezoelectric diaphragm 13 has a structure in which, for example, piezoelectric ceramics are bonded to a metal plate such as brass. Each spring 11 is mounted in a compressed state in an axial space limited by the substrate unit 6 and the piezoelectric diaphragm 13, and the rear end of each spring 11 is elastic to each corresponding electrode of the substrate unit 6. Similarly, the front end of one spring 11 is electrically connected as an elastic contact to the piezoelectric ceramic electrode of the piezoelectric diaphragm, and the front end of the other spring 11 is the same. It is electrically connected to the metal plate as an elastic contact. With such a configuration, even when the piezoelectric diaphragm 13 vibrates, the respective contacts are not separated from each other.

  On the outer peripheral surface (outer surface) 30B of the rear cylindrical portion 30 of the light guide unit 3, a plurality (eight in this example) of projecting portions 36 projecting outward in the radial direction are provided. The portions 36 are arranged at radially outward positions of the corresponding protruding strip portions 33 (therefore, positions outside the outer periphery of the annular groove 32C). That is, each protrusion 33 and each protrusion 36 corresponding thereto are aligned in the radial direction via the rear tubular portion 30. Each protrusion 36 has, for example, a truncated pyramid shape (here, a quadrangular pyramid shape).

  As shown in FIGS. 9 and 10 which are cross-sectional views taken along lines IX-IX and XX of FIG. 8, respectively, a conical recess is formed in the center on the front side (the upper side in the drawing) of the bottom 32 of the light guide unit 3. 32A is formed, the concave portion 32A is reduced in diameter toward the rear side, and the inner peripheral surface 32a of the concave portion 32A is an inclined surface. The bottom surface of the blind hole 32B formed on the rear surface side (the lower side in the figure) of the bottom portion 32 is formed in a flat shape and is orthogonal to the axis. The blind hole 32 </ b> B is arranged to face the LED 60 of the board unit 6. Therefore, in this example, the rear surface side of the light guide unit 3 is the light source side, and the front surface side is opposite to the light source side. As shown in FIG. 9, each protrusion 36 on the outer peripheral surface 30B of the rear cylindrical portion 30 has a trapezoidal vertical cross-sectional shape, and the vertical cross-sectional shape is arranged on the front side and in the axial direction. It has a flat surface 36a extending along, and an inclined surface 36b arranged on the rear side and extending while being inclined with respect to the axial direction.

As shown in FIGS. 11 and 12 (both are omitted for the sake of convenience of illustration), the buzzer 1 with the illumination function is, for example, a control panel or the like. when installing the panel W, after inserting the rear 21 of the body 2 to the opening W _O panel W, by tightening the rear side of the lock nut 8 is screwed to the male screw 21b of the rear 21, the panel W Attached to. At this time, in a state where the rear cylindrical portion 30 of the light guide unit 3 is inserted into the annular groove 20c of the front portion 20 of the body 2, the inner peripheral surface 30A of the rear cylindrical portion 30 is the annular wall of the body 2. It is pressed against the O-ring 14 seated on the step portion 20C ₁ parts 20C, thereby, between the side tubular portion 30 and the front 20 of the body 2 after the light guiding unit 3 is sealed. Further, the contact-side region of the piezoelectric diaphragm 13 is sealed by the packing 12 inside the front cylindrical portion 31 of the light guide unit 3.

In configured illumination function buzzer 1 as described above, as shown in one-dot chain line L ₁ in FIG. 11, the light emitted from LED60 board unit 6, passes through a blind hole 32B of the light guide unit 3 Then, the light enters the bottom portion 32 and proceeds through the inside of the light guide unit 3, and is totally reflected at the interface with the inner peripheral surface 32a of the conical concave portion 32A formed on the front surface side of the bottom portion 32 and outward in the radial direction. Proceed radially. Of the light traveling in the radial direction, the light passing through the ridge 33 is totally reflected at the interface with the inclined surface 36b of the protrusion 36 and travels forward in the axial direction. Irradiated from the front to the outside. In this case, the alternate long and short dash line L ₁ indicates a _first light guide path that guides the light from the LED 60 to the front side of the light guide unit 3, and the first light guide path L ₁ is on the rear side of the piezoelectric diaphragm 13. It arrange | positions so that the emitted light from arrange | positioned LED60 may be guide | induced to the front side of the light guide unit 3, detouring the piezoelectric diaphragm 13. FIG. The first light guide path L ₁ is configured to include the recess 32A of the light guide unit 3, the convex portion 33 and the projection 36.

Further, as shown in one-dot chain line L ₂ in FIG. 12, among the light traveling radially radially outward totally reflected from the interface between the inner circumferential surface 32a of the emitted recess 32A from LED60 board unit 6 The light passing through the gaps 34 between the convex portions 33 adjacent to each other in the circumferential direction passes through the rear tubular portion 30 of the light guide unit 3 and travels outward in the radial direction, and passes through the front cover 5. Irradiated from the outer surface of the front cover 5 to the outside. In this case, an alternate long and short dash line L ₂ indicates a _second light guide path that guides light from the LED 60 to the outer surface side of the light guide unit 3. The second light guide path L ₂ is constituted by a recess 32 A and a gap 34 of the light guide unit 3.

  As shown in FIG. 11 and FIG. 12, the inner peripheral surface 32a of the conical recess 32A formed on the front surface side of the bottom portion 32 of the light guide unit 3 has the light incident from the rear surface side all radially outward. Similarly, the inclined surface 36b of the protrusion 36 of the light guide unit 3 totally reflects light traveling outward in the radial direction in the axial direction so as to be reflected from the axial direction. It has an inclination angle. That is, the inclination angle of each inclined surface is set so that the incident angle of light on each inclined surface is larger than the critical angle.

  On the other hand, sound generated from the piezoelectric diaphragm 13 is emitted to the outside through the through hole 4 a of the inner cover 4 and the through hole 5 a of the front cover 5.

According to the present embodiment, since the annular groove 32C for holding the piezoelectric diaphragm 13 as a sounding body via the packing 12 is provided on the front side of the light guide unit 3, the piezoelectric diaphragm 13 is connected to the light guide unit 3. The sound emitted from the piezoelectric diaphragm 13 can be immediately emitted from the front side of the light guide unit 3 to the outside, thereby improving the sound pressure. Moreover, according to the present embodiment, the light emitted from the LED 60 is guided to the front side of the light guide unit 3 through the first light guide path L ₁ of the light guide unit 3, so that the piezoelectric diaphragm 13 is disposed in front of the LED 60. Can be irradiated from the front side of the light guide unit 3. Further, light emitted from LED60 passes through the second light guide path L ₂ can also be irradiated from the outer surface side of the light guide unit 3, by which, the visibility front and outer surface of the front cover 5 and the light-emitting Can be improved.

[First Modification]
As the piezoelectric diaphragm 13 in the above-described embodiment, a structure other than the structure described above may be used, and a sounding body other than the piezoelectric diaphragm may be employed.

[Second Modification]
In the above embodiment, the piezoelectric diaphragm 13 is held by the annular groove 32 </ b> C formed in the light guide unit 3 via the packing 12. However, the piezoelectric diaphragm 13 is packed by the flat bottom surface of the bottom portion 32. You may make it hold | maintain via another elastic member.

[Third Modification]
In the above embodiment, although the first second example in which the light guide path L ₂ in addition to the light guide path L _1, the second light guide path L ₂ is may be omitted. In this case, in order to improve the visibility, for example, the shape of the front cover 5 is made spherical, so that the light incident on the front surface of the front cover 5 also goes around the outer surface side of the front cover 5. Can be considered. Alternatively, since the first light guide path L ₁ is to branch into both the axial and radially outward by the inclined surface 36b of the protrusion 36, for adjusting the inclination angle of the inclined surface 36b, incident on the inclined surface 36b A part of the transmitted light may be transmitted radially outward, while the remaining light may be reflected by the inclined surface 36b.

[Fourth Modification]
In the above embodiment, as the ridge portions 33 and the projecting portion 36 forming the first light guide path L ₁ of the light guiding unit 3, an example provided with eight convex portions 33 and the eight protruding portions 36 Although shown, the number of the protrusions 33 and the protrusions 36 is not limited to this, and any appropriate number can be adopted.

[Fifth Modification]
In the above embodiment, although the first light guide path L ₁ of the light guiding unit 3 is an example configured to include a ridge 33, the ridge portions 33 can be omitted. In this case, of the light that is totally reflected at the interface with the inner peripheral surface 32a of the recess 32A of the light guide unit 3 and travels radially outward, the light incident on the protrusion 36 is the interface with the inclined surface 36b. Thus, the light that is totally reflected and proceeds forward in the axial direction, and the light that does not enter the protruding portion 36 passes through the rear cylindrical portion 30 and travels outward in the radial direction. In addition, when the protruding line part 33 is provided, not only the light to the protrusion part 36 can be easily guided, but also a rib-like effect of reinforcing the bottom part 32 of the light guide unit 3 can be expected.

[Sixth Modification]
13 and 14 show a state in which the rubber cover 15 is attached to the buzzer 1 with the illumination function of the embodiment, and these drawings correspond to FIGS. 1 and 3 of the embodiment, respectively. The front portion of the rubber cover 15 is fitted to the outer periphery of the rear portion 21 of the body 2, and the rear portion is fitted to the outer periphery of the power cable 7. By attaching the rubber cover 15, the waterproof property of the buzzer 1 with an illumination function can be improved.

[Other variations]
The above-described embodiments and modifications are to be regarded as merely illustrative of the present invention in all respects and are not limiting. Those skilled in the art to which the present invention pertains will not depart from the spirit and essential characteristics of the present invention without departing from the spirit and essential characteristics thereof, even if not explicitly stated herein. Various modifications and other embodiments employing the above principle can be constructed.

[Other application examples]
In the above-described embodiment and each of the modifications, the buzzer with an illumination function has been described as an example. However, the application of the light guide unit according to the present invention is not limited thereto, and other sounding devices having an illumination function or a light emission function. Or a sound generator or a sound generator. The present invention can also be applied to an indicator lamp having a sound generation function.

  The present invention is useful for a light guide unit, and is particularly suitable for those requiring both light irradiation from the front side and improvement of sound pressure.

1: Buzzer with illumination function

3: Light guide unit 30B: Outer peripheral surface (outer surface)
32C: annular groove (holding part)
36: Projection

13: Piezoelectric diaphragm (sound generator)

60: LED (light source)

L ₁ : First light guide L ₂ : Second light guide

Japanese Utility Model Publication No.59-34960 (see FIG. 2)

Claims (3)

In the light guide unit,
A holding portion for holding a sounding body that is provided on the front side of the light guide unit and generates sound;
A first reflecting surface that reflects light from the light source;
A second reflecting surface that reflects the light reflected by the first reflecting surface to the front side of the light guide unit ;
A plurality of ridges provided between the first and second reflecting surfaces ;
The light from the light source is reflected by the first reflecting surface, passes through the ridge, and is reflected by the second reflecting surface and guided to the front of the light guiding unit. And a second light guide path in which light from the light source is reflected by the first reflection surface and guided to the outer surface side of the light guide unit through a gap between the adjacent protruding portions. ing,
A light guide unit characterized by that. In claim 1,
The first light guide path includes a protrusion that protrudes outward from the outer surface of the light guide unit, and the second reflection is disposed on the outer periphery of the holding portion. Have a surface,
A light guide unit characterized by that.   The buzzer with an illumination function provided with the light guide unit according to claim 1.

Images