JPH09311222A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the assembly characteristic of a display device capable of effectively curving and guiding the exit light from a light emitting element and recognizing this light, to facilitate the mounting of the device to a circuit board and to make positioning accuracy exact. SOLUTION: This display device consists of a transparent light transmission body 12 which has a photodetecting surface 15 for making the exit light of the light emitting element on the circuit board incident, a slope 16 for reflecting the incident light in a front surface direction, a light guiding part 27 for guiding the reflected light to the front surface side and a flat detaining piece part 18 projectingly formed on the rear surface side and a light transmission body holding member 14 which has a front surface side opening 31 to be made peepable to the front surface by fitting this light guiding part into the inside, a rear surface side opening 32 for engaging the detaining piece part 18 with the rear surface side by fitting this part therein and an engaging part 29 for detaining the circuit board by engaging with the circuit board.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device capable of effectively bending and guiding light emitted from a light emitting element.

In various devices in the fields of electronic and communication, devices having various functions according to the purpose are configured, and various operating displays of these devices are displayed by blinking or by different colors. It is necessary to be able to recognize visually.

In the perspective view of FIG. 26, only a part of the main portion of the printed wiring board unit is schematically shown, and the housing and the like are not shown. In the printed wiring board unit 1, a printed wiring board 2 having a circuit is provided with a plug-in connector 3 on the back side and a surface board 4 on the front side.
Each is plugged in and connected to a housing (not shown).

The surface plate 4 is provided with a plurality of window holes 5 for visually recognizing the light emitted from the light emitting elements mounted and connected to the printed wiring board 2 and displayed according to the operating state of the equipment. Thus, the emitted lights of the plurality of light emitting elements mounted inside can be respectively recognized through the window holes 5.

In the present specification, for convenience of description, the surface plate 4 side of the circuit board 2 will be referred to as a front surface or front, and the plug-in connector 3 side will be referred to as a rear surface or rear.

[0006]

2. Description of the Related Art FIG. 27 is a schematic perspective view showing a main part of a conventional display device together with a printed wiring board unit. The printed wiring board 2 and the surface board 4 are shown in a separated state, and through-hole lands 8 for inserting and connecting the lead wires 7 of the light emitting elements 6 are formed on the printed wiring board 2 together with a circuit pattern (not shown). Has been done. A window hole 5 is provided in the surface plate 4 corresponding to the position of the through hole land 8.

The light emitting element 6 is a light emitting diode (LED).
The two lead wires 7 are extended in parallel as shown by the chain double-dashed line, and the lead wires 7 are bent in the 90 ° direction as shown by the solid lines and the required length is increased. Then, the printed wiring board 2 is fixedly supported by the through-hole land 8 and is connected by soldering 9 as shown in FIG.

As shown in the drawing, the tip of the light emitting element 6 is seen through the window hole 5 of the surface plate 4 and slightly protrudes. Depending on the operating state of the device, the light emitting element 6 is turned on or off, but when turned on, the color of the selected synthetic resin molding material shines and can be recognized.

[0009]

In the conventional display device described above, the light emitting element 6 itself can be easily used as a display device, but the lead wires 7 extending in a straight line are bent in parallel at precise positions. It is cut and inserted into the through hole land 8 of the printed wiring board 2 so as to be surely aligned with the position of the window hole 5 of the surface plate 4 and fixed by soldering 9.

Since this is done in a state where the surface plate 4 is not attached, that is, when the printed wiring board 2 is mounted as a single component, the mounting work takes time in addition to requiring skill.

Bending, cutting and soldering of the lead wire 9
In addition to the troublesome work of requiring a dedicated mold, a holder, etc. for positioning support at the time, etc., the position of the light emitting element 6 mounted by accurate positioning until the surface plate 4 is attached. However, there is a problem that the soft lead wire 7 is moved and deformed by some kind of momentum.

In view of the various problems as described above, the present invention solves these problems, improves the assemblability, is easy to mount on a circuit board, and has a precise positional accuracy. Is the subject of the invention.

[0013]

The first means, which is the gist of the constitution of the present invention for achieving the above-mentioned object, is a first means, which faces a light emitting element arranged on a circuit board, and emits light from the light emitting element. A light-receiving surface for making incident light, an inclined surface for reflecting the incident light incident from the light-receiving surface toward the front surface, a light guide portion for guiding the incident light to the front surface side, and a flat member protrudingly formed on the rear surface side. A light guide body made of an optically transparent synthetic resin molded product having a stop piece portion, a front side opening for allowing the light guide portion of the light guide body to be fitted into the inside and looking into the front surface, and the locking piece portion. A light guide holding member made of a synthetic resin molded product, the light guide holding member having a back side opening for fitting and engaging on the back side and an engaging portion for engaging and locking the circuit board; The light guide part of the light guide is fitted into the opening on the front side of the member, and the rear side of the light guide holding member A display device with and locked so fitted the locking piece portion of the light guide body in the mouth.

According to the first means of the present invention described above, the light guide body and the light guide body holding member, each of which is a synthetic resin molded product, can be easily assembled by combining them in two operations.
It can be stored and handled in a stable shape as a single part.

The light emitting element can be placed and mounted on a circuit board consisting of a printed wiring board as a single unit at the same time as mounting other circuit components, and the display device can be one-touch type in the circuit board in the subsequent process. Can be attached to.

The light emitted from the light emitting element, which is emitted so as to have a spread in the direction perpendicular to the surface of the circuit board, is incident from the light receiving surface of the display device, travels in the direction biased based on the refractive index, and is increased by the inclined surface. The part is totally reflected and guided to the front light guide part.

The second means of the present invention is in addition to the first means, and the inclination angle of the inclined surface with respect to the light-receiving surface of the light guide is set such that the back side from directly above the light emitting element is larger than the front side. It is a device.

According to the second means of the present invention described above, in addition to the first means, in addition, in the first means, the amount of incident light transmitted and leaked from directly above the light emitting element on the inclined surface to the back side is
The light can be totally reflected and guided to the light guide section on the front side.

A third means of the present invention is a display device in which the front side of the light receiving surface of the light guide is extended in the circuit board direction in addition to the first means. According to the third means of the present invention described above, in addition to the first means, further, in the first means, a portion having a total reflection angle on the front surface side of the light receiving surface with respect to the light emitting element,
By extending in the direction of the circuit board, it becomes possible to directly enter the inside of the light guide portion effectively, and the emitted light can be effectively introduced.

The fourth means of the present invention is in addition to the first means, and protrudes larger than the diameter of the insertion hole for attachment of the circuit board on both side surfaces of the light guide holding member which are symmetrical with respect to the engaging portion. The display device is provided with a protrusion that can be compressed and deformed by being pushed into the mounting insertion hole.

According to the above-mentioned fourth means of the present invention, in addition to the first means, when the engaging portion is inserted into the mounting insertion hole of the circuit board, the centrally symmetrical projection is directed toward the center. By being compressed and deformed, the engaging portion is automatically set at the center position with respect to the attachment insertion hole. That is, since the display device has the self-aligning function, the display device can be accurately positioned on the circuit board without being displaced.

The fifth means of the present invention is a display device in addition to the first or fourth means, wherein the light guide holding member has two engaging portions on both sides. According to the fifth means of the present invention described above, in addition to the first or fourth means, the number of engaging portions is set to a minimum number of two locations on both sides, so that the circuit board can be easily attached. Nevertheless, the positioning accuracy of the display device can be more effectively performed.

The sixth means of the present invention is a display device in addition to the first means, wherein the end surface of the light guide portion of the light guide body is a light scattering surface. According to the sixth means of the present invention, in addition to the first means, the light guide portion end surface of the light guide body is further used as a light scattering surface, so that the light emitted from the end surface of the light emitting element in the lighting state is It becomes easier to recognize clearly, and it becomes possible to recognize from a wide range of directions.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION The display device of the present invention will be described below.
An embodiment based on the structure will be specifically described in detail with reference to the drawings. Note that the same reference numerals are given to the same parts throughout the drawings for easy understanding.

1 and 2 are perspective views of a display device according to a first embodiment of the present invention. FIG. 1 is shown in a separated state when viewed from the upper side, and FIG. 2 is shown in the same state when viewed from the back side. The display device 11 includes a light guide body 12 and a light guide body holding member 14, both of which are synthetic resin molded products and are integrated.

In each figure, a light guide 12 faces a light emitting element arranged on a circuit board (not shown), and a light receiving surface 15 on which light emitted from the light emitting element is incident, and a light receiving surface 15 is incident. An inclined surface 16 that reflects the incident light toward the front surface, and a light guide portion 17 that guides the incident light to the front surface side,
An optically colorless and transparent synthetic resin, for example, polycarbonate, acrylic resin, or the like, which is provided with a flat locking piece portion 18 protrudingly formed on the back surface side, and can be appropriately selected.

The light receiving surface 15 is parallel to the surface of the circuit board, and the inclined surface 16 is given an optimum inclination angle on the light receiving surface 15. The light guide portion 17 has a rectangular cross section and extends in a direction parallel to the light receiving surface 15. It seems that the lower surface of the locking piece portion 18 coincides with the extension surface of the light receiving surface 15, and the upper surface continues to the lower end on the rear surface side of the inclined surface 16.

Hemispherical locking projections 21 are formed at two positions on the upper surface on the back side of the locking piece 18, and a chamfered inclined surface 22 is formed on the lower surface. Light receiving surface 1
The front surface side of 5 is a second light receiving surface 23 extending at a predetermined angle in the circuit board direction, that is, the lower side.

As is clear from the figure, the light receiving surface 15, the inclined surface 16, the chamfered inclined surface 22, and the second light receiving surface 23 have a wide width in plan view, and the light guide portion 17 in plan view. The width is narrow. Therefore, the intermediate portion has a tapered surface 24 whose side surface is relatively gentle in plan view, and the lower inclined surface 2.
5 are continuously formed.

As shown in FIG. 2, the light guide holding member 14 for receiving and holding the light guide 12 has a box-shaped main body portion 27 when viewed from the rear side, and is stretched laterally at diagonal positions on both side surfaces. The leg portion 28 is extended and an engaging portion 29 that protrudes downward is provided at the center of the leg portion 28.

A rectangular frame-shaped front side opening 31 into which the light guide section 17 of the light guide body 12 is fitted is provided on the front side of the main body section 27.
A flat frame-shaped rear side opening 32 into which the locking piece portion 18 is fitted is formed on the rear side.

On the front side and the back side of the back surface of the main body 27,
Protrusions 34 are formed so as to coincide with the bottom surface 33 of the leg portion 28, and the posture is stabilized so that rattling does not occur when the leg portion 28 is attached to the circuit board.

As shown in FIG. 1, the notch 35 on the upper surface of the front surface side opening 31 of the main body 27 and the rear surface side opening 32.
The notch 36 and the notch on the upper surface are provided in a necessary portion for the reason described below.

The light guide member holding member 14 is formed by molding polybutylene terephthalate (PBT), which has various mechanical and electrical properties such as moldability and elasticity.

Next, the procedure for assembling the light guide 12 and the light guide holding member 14 will be described with reference to the side sectional view of FIG. In the figure, the light guide holding member 14 is shown in cross section. First,
As shown in FIG. (A), the locking piece portion 18 is on the back surface side, and the light guide portion 17 of the light guide body 12 is inserted obliquely upward from the back surface side of the light guide body holding member 14. The tip of 17 is fitted into the front side opening 31.

As is apparent from FIG. 5A, it is well understood that the light guide portion 17 is inserted by reaching the front side opening 31 and the notch 35 portion. The notch 35 is a necessary part for this reason. At the same time, the upper portion of the inclined surface 16 of the light guide body 12 has the rear side wall 37 of the light guide body holding member 14.
Since the inclined surface 16 can be inserted along the lower end of the light guide 1 as it comes into contact with the lower end of the light guide 1.
2 can be placed in a horizontal position.

When the lower end of the rear side wall 37 comes into contact with the upper surface of the locking piece portion 18, the locking projection 21 comes into contact with the lower end, so that the light guide 12 is pushed rearward. This state is shown in FIG. The front end of the locking piece 18 has a rear side opening 3
Although the chamfered inclined surface 22 rides on the lower surface corner of No. 2, the locking projection 21 contacts the upper surface of the rear side opening 32 and cannot enter further.

In this state, when the front surface of the light guide body 12 is pushed in the back direction by a pressing device or an appropriate tool, the elastic protrusions of the two push the locking projection 21 through the rear side opening 32. As shown in (c), the locking piece 18 is fitted into the rear side opening 32, and the locking projection 2
1 is located in the back notch 36. That is, the position is restricted and the locked state is achieved.

The light guide portion 17 of the light guide body 12 is fitted into the frame-shaped front side opening 31 and the tip side is seen in the front side, and is defined to be immovable vertically and horizontally. The locking piece portion 18 is also fitted into the frame-shaped rear side opening 32, and is similarly defined to be immovable in the vertical and horizontal directions, and the lower end of the inclined surface 16 and the locking projection 21.
And are regulated by the front and rear surfaces of the rear side wall 37, and the position in the front and rear direction is fixed. Assembly is completed as described above.

FIG. 4 shows a perspective view of a main part of the display device of the present invention attached to a circuit board in a separated state. The display device 11 is an assembly of the light guide 12 and the light guide holding member 14 as described above, and is an SMD type (surface mount component type) that is arranged and mounted at a predetermined position on the circuit board 2. ) Light emitting element 41), which is a two-color light emitting type LED having four terminals.

On the circuit board 2, mounting holes 42 for mounting the display device 11 are provided on the opposite sides of the light emitting element in diagonal directions, and engaging portions 29 are provided.
It is formed in two places corresponding to. A window hole 5 in the surface plate 4
Is provided.

FIG. 5 is a cross-sectional view of a main part of the display device 11 with the display device 11 attached to the circuit board 2. That is, the engaging portion 29 of the display device 11 is pressed and inserted from above the mounting insertion hole 42 of the circuit board 2 so that the display device 11 can be mounted very easily, positioned and locked, and the light receiving surface 15 is fixed. Since the light emitting element 41 is just positioned opposite to the upper portion of the light emitting element 41, the surface plate 4 is mounted on the circuit board 2 after that.
Attached to the light guide 1 as shown.
The tip of the second light guide portion 17 is located in the window hole 5 and is looked into the front surface thereof.

The detailed structure of the engaging portion 29 for mounting the display device 11 on the circuit board 2, positioning and fixing the same will be described with reference to FIGS. 6 and 7 for one side of the pair. FIG. 7A is a rear view, and FIGS. 9B and 9C are side views of FIG. 9A, which are different from each other in an orthogonal view.

The engaging portion 29 projecting from the center of the leg portion 28 of the light guide holding member 14 has a shaft portion 45 on the bottom surface 33 side and a locking portion 46 on the tip end side in the embodiment of FIG. Consists of.
The diameter of the shaft portion 45 is equal to the insertion hole 42 for mounting the circuit board 2.
It is much smaller and slightly smaller than the diameter (Fig. 4). The length is also slightly longer than the thickness of the circuit board 2.

The engaging portion 46 has a conical shape with a spherical end on the tip side, and is formed on the shaft portion 45 side in an elliptic shape having a short diameter equal to the diameter of the shaft portion 45 and a wide diameter. A slit 47, which is open at the tip and reaches the shaft portion 45, is provided so as to transversely divide the short diameter portion of the ellipse.

Further, on the peripheral surface of the shaft portion 45, as shown in the partially enlarged sectional view of FIG. 42
Is provided with a protruding roof-shaped protrusion 48 larger than the diameter of the. The width of the protrusion 48 on the surface of the shaft portion 45 is not so large. The insertion hole 42 for mounting is shown in FIG.
Is indicated by a chain double-dashed line.

In the embodiment of FIG. 7, the basic structure is the same as that of FIG. 6, except that the slit 47 formed in the engaging portion 46 is not opened at the tip and the tip is The connection is blocked.

The state in which the circuit board 2 is pushed into the mounting insertion hole 42 and inserted is shown in FIG. 8 (b). Explaining also with reference to FIG. 4 and FIG. 5, when the engaging portion 29 is applied to the mounting insertion hole 42 and the tip thereof is pressed, a slit is formed so that the conical portion fits into the mounting insertion hole 42. 47 and elastically deforms, and finally the oval portion passes through the mounting insertion hole 42, whereby the shaft portion 45 is positioned in the mounting insertion hole 42,
Since the locking portion 46 is elastically restored and the long-diameter portion expands beyond the periphery of the mounting insertion hole 42, the engaging portion 29 does not easily come out of the mounting insertion hole 42.

In the above process, the protrusion 48 around the shaft 45 is formed.
When the tip of the board contacts the mounting insertion hole 42, the circuit board 2
Because of the higher strength, the projection 48 is elastically compressed and deformed and pushed into the mounting insertion hole 42.
At this time, since the protrusions 48 are provided symmetrically with respect to the center, the center of the attachment insertion hole 42 and the center of the shaft portion 45 are automatically aligned with each other when the protrusion 48 is positioned at the maximum diameter portion of the attachment insertion hole 42. As a result, self-centering is performed so that the centers do not become biased.

The press-fitted state shown in FIG. 6B due to such compression deformation is nothing but the matching of the display device 11 to an accurate position, and the positioned state is stable without wobbling or moving. Will be maintained.

Although the above description is omitted in FIGS. 1, 2, and 3, it is naturally applied, and the same applies to each of the subsequent embodiments. The relationship between the light guide of the display device of the present invention and the light emitted from the light emitting element will be described in detail below with reference to the drawings. FIG. 9 shows the basic relationship of the incident light rays 52 traveling from the light guide body 12 to the inclined surface 16.

With the inclined surface 16 as a boundary surface, the lower side (front side) in the drawing is the inside of the light guide 12, and the upper side is the air layer, and a line perpendicular to the inclined surface 16 is a normal line 51. The angle between the incident ray 52 incident on the inclined surface 16 from directly below in the figure and the normal 51 is θ ₁ , and the incident ray 52 is refracted through the inclined surface 16 and is refracted and emitted to the space. Is θ ₂ , the refractive index of the light guide body 12 is N ₁ = (in the case of polycarbonate) 1.585, and the refractive index of air is N ₂ =
If 1.0, the law of refraction (Snell's law) is given by N ₁ · sin θ ₁ = N ₂ · sin θ ₂ (1).

From the above equation, the refracted ray 53 emitted from the inclined surface 16 is parallel to the inclined surface 16, that is, θ ₂ =
The incident angle θ ₁ of the critical angle of 90 ° is sin θ ₁ = (N ₂ / N ₁ ) sin θ ₂ (2), so that θ ₁ = sin ⁻¹ N ₂ / N ₁ (3) When the body 12 is made of polycarbonate, θ ₁ = 39 ° 7 ′ (4) is obtained due to the above refractive index.

Therefore, when the incident angle θ ₁ is set to 39 ° 7 ′ or more, in other words, the incident light is set by setting the angle of the inclined surface 16 with respect to the incident light to such an angle. The inclined surface 16 is reflected light 54 that is totally reflected toward the inside of the light guide 12.

An embodiment of the first light guide of the present invention will be described with reference to the perspective view of FIG. The figure (a) shows the state seen from the upper surface side, and the figure (b) shows the state seen from the back surface side, respectively.

The first light guide 12-1 faces a light emitting element arranged on a circuit board (not shown), and has a light receiving surface 15 on which the light emitted from the light emitting element is incident, and an incident light from the light receiving surface 15. Surface 1 that reflects the incident light that has been directed toward the front surface
6, a light guide portion 17 for guiding incident light to the front side, and a flat locking piece portion 18 projectingly formed on the back side, which is optically colorless and transparent as described above. It is selected from synthetic resins.

The light receiving surface 15 is parallel to the surface of the circuit board, and the inclined surface 16 is provided with an inclination angle optimum for total reflection on the light receiving surface 15 as described above. The light guide portion 17 has a rectangular cross section and extends in a direction parallel to the light receiving surface 15. Locking piece 1
The lower surface of 8 corresponds to the extension surface of the light-receiving surface 15, and the upper surface of the surface 8 is continuous with the lower end of the inclined surface 16 on the rear surface side.

Hemispherical locking projections 21 are formed in two lines on the upper surface on the back side of the locking piece portion 18, and a chamfered inclined surface 22 is formed on the lower surface side. Light receiving surface 1
The front surface side of 5 is a second light receiving surface 23 extending at a predetermined angle in the circuit board direction, that is, the lower side.

As is clear from the figure, the light receiving surface 15, the inclined surface 16, the second light receiving surface 23, and the locking piece portion 18 have a wide width in plan view, and the light guiding portion 17 in plan view. The width is narrow.
Therefore, the intermediate portion is continuously formed by the tapered surface 24 having a relatively gentle side surface in plan view and the lower inclined surface 25.

The reason why the width of the light receiving surface 15, the inclined surface 16, etc. is wide is that the light emitting element has two light emitting points in the width direction and can emit two colors. This is because the width of the light emitting element is set to be the same as that of the light emitting element so that the light can be incident as effectively as possible.

The reason why the width of the light guide portion 17 is narrow is that the incident light that has been incident is focused on the front end face of the light guide portion 17 and is displayed with high brightness, so that the degree of recognition is increased. Hereinafter, each part will be described with reference to exploded views. In addition, in this embodiment, in order to facilitate understanding, the material of the first light guide body 12-1 is polycarbonate for convenience.

Referring to FIG. 11, the first light guide 12-
1 is a side sectional view of FIG. 1 and a facing positional relationship between the light emitting element 41 arranged and mounted on the circuit board 2. The center line 55 of the light emitting element 41 is perpendicular to the surface of the circuit board 2 and also coincides with the light emitting portion 56. Therefore, two color light emission points 5
6 are arranged in a direction orthogonal to the paper surface. The two colors can be individually blinked, and the two colors can be turned on at the same time to form a mixed color.

The emitted light emitted along the center line 55 of the light emitting element 41 is incident at a right angle to the light receiving surface 15 and reaches the inclined surface 16 in a linear state without being affected by the refractive index. A line perpendicular to the inclined surface 16 at the intersection point where the inclined surface 16 and the center line 55 intersect is defined as a normal line 51. This center line 55 and normal 51
The angle θ formed by and is set to 40 °, which is larger than the total reflection angle 39 ° 7 ′ described above.

In all the following drawings, the emitted light emitted from the light emitting portion 56 of the light emitting element 41 toward the space is refracted by the synthetic resin due to the light emitting element 41 being molded by the transparent resin. Although the light is refracted depending on the refractive index, the size of the light emitting element 41 is extremely small, and therefore the distance between them is very small, which does not make the essential understanding of the present invention unreasonable. It is assumed that the path of the emitted light is a straight line and is emitted to the space.

FIG. 12 typically shows the incident light reaching the inclined surface 16 in the vicinity of both end portions. The incident light incident on the light receiving surface 15 is refracted at each incident point as shown in the figure due to the difference in refractive index from the space, and is incident into the first light guide body 12-1.

On the front side from the center line 55 of the inclined surface 16, the incident light at a reflection point 57 near the center line 55 is totally reflected and goes straight inside the light guide section 17 to reach the light guide section end surface 58 of the light guide section 17. It Incident light at a reflection point 59 distant from the center line 55 of the inclined surface 16 is totally reflected and reflected at the reflection point 6 on the upper surface of the light guide portion 17.
At 1, the light is totally reflected again and goes straight inside the light guide portion 17 to reach the end surface 58 of the light guide portion.

Between these reflection points 57 and 59,
The same total reflection is performed on each of them and reaches the end surface 58 of the light guide portion. The fact that the light is totally reflected as described above will be easily understood from the above description without intentionally explaining it in detail, and therefore the description thereof is omitted here.

FIG. 13 shows the incident light incident on the second light receiving surface 23, typically at both ends thereof. As is apparent from the figure, the second light receiving surface 23 has a light emitting portion 56.
The tilt angle is set so as to be substantially opposite to. Therefore, the incident light that is incident is only slightly affected by the difference in the refractive index from the space, and travels into the light guide portion 17 in a state of being almost straight.

The incident light incident on the lower end portion of the second light receiving surface 23 in the figure is totally reflected at the reflection point 62 on the front side of the upper surface of the light guide portion 17 and reaches the end surface 58 of the light guide portion. The incident light that has entered the upper end of the second light receiving surface 23 in the figure is totally reflected at the reflection point 63 in the middle portion of the upper surface of the light guide portion 17 and reaches the end surface 58 of the light guide portion.

As described above, most of the incident light incident on the front side from the center line 55 is effectively totally reflected by the respective surfaces, reaches the light guide end face 58, and is superposed. Therefore, the emitted light from here can be visually recognized. This is nothing but the setting of the angle between the center line 55 and the normal line 51 on the inclined surface 16 to be slightly larger than the critical angle, as described with reference to FIG. Therefore, the angles formed by the incident rays and the normals at the respective reflection points on the inclined surface 16 are all at or above the critical angle.

On the other hand, the emitted light emitted from the center line 55 to the back side will be described with reference to FIG. 14. The emitted light from the light emitting element 41 is incident on the light receiving surface 15 at a position symmetrical with FIG. The incident light thus generated is transmitted at the back side of the center line 55 of the inclined surface 16 without being totally reflected by the inclined surface 16 because it is below the critical angle, and is leaked to the outside as shown by an arrow 65. .

As described with reference to FIG. 13, the second light receiving surface 23
Light emitted in a direction symmetrical to is totally reflected by the surface of the locking piece portion 18 which is an extended surface of the light receiving surface 15 and is indicated by the arrow 6
As shown in 6, the light is radiated to the back side space.

In this way, the emitted light emitted from the center line 55 in the back direction is emitted to the space. As described above, the light emitting device 41 shown in FIGS.
The combined state of the optical path relationship between the first light guide 12-1 and the first light guide 12-1 is shown in FIG. The individual explanations here are as described with reference to the respective drawings, so refer to the aforementioned explanations together with the drawings as necessary.

One embodiment of the second light guide of the present invention will be described with reference to the perspective view of FIG. The figure (a) shows the state seen from the upper surface side, and the figure (b) shows the state seen from the back surface side, respectively.

The second light guide 12-2 faces a light emitting element arranged on a circuit board (not shown), and receives the light emitted from the light emitting element 15 and the light receiving surface 15. The first inclined surface 16-1 and the second inclined surface 16-2 that reflect the incident light toward the front surface, the light guide portion 17 that guides the incident light to the front surface side, and the protrusion to the rear surface side It is provided with the formed flat locking piece portion 18, and is selected from the optically colorless and transparent synthetic resin as described above.

The light receiving surface 15 is parallel to the surface of the circuit board, and the first and second inclined surfaces 16-1 and 16-2 have the optimum inclination angle for total reflection as described above on the light receiving surface 15. Has been given. The light guide portion 17 has a rectangular cross section and extends in a direction parallel to the light receiving surface 15. It seems that the lower surface of the locking piece portion 18 coincides with the extension surface of the light receiving surface 15 and the upper surface thereof is continuous with the lower end on the rear surface side of the second inclined surface 16-2.

Hemispherical locking projections 21 are formed at two positions on the upper surface on the back side of the locking piece 18, and a chamfered inclined surface 22 is formed on the lower surface. Light receiving surface 1
The front surface side of 5 is a second light receiving surface 23 extending at a predetermined angle in the circuit board direction, that is, the lower side.

As is apparent from the figure, the planes of the light receiving surface 15, the first inclined surface 16-1, the second inclined surface 16-2, the second light receiving surface 23, and the locking piece portion 18 are flat. The view width is wide, and the plan view width of the light guide portion 17 is narrow. Therefore, the intermediate portion is continuously formed by the tapered surface 24 having a relatively gentle side surface in plan view and the lower inclined surface 25.

Light receiving surface 15, first inclined surface 16-1, second surface
The reason for the wide width of the inclined surface 16-2, etc. is that the light emitting element has two light emitting points in the width direction and two colors of light can be emitted, so that each emitted light can be maximized effectively. This is because the width of the light emitting element is the same as that of the light emitting element.

The reason why the width of the light guide portion 17 is narrow is that the incident light emitted is focused on the front end face of the light guide portion 17 to be displayed with high brightness so that the degree of recognition is increased. Hereinafter, each part will be described with reference to exploded views. Note that, also in the present embodiment, in order to facilitate understanding, the material of the second light guide body 12-2 is polycarbonate for convenience.

Referring to FIG. 17, the second light guide 12-
2 shows a side cross-sectional view of FIG. 2 and a facing positional relationship between the light emitting element 41 arranged and mounted on the circuit board 2. The center line 55 of the light emitting element 41 is perpendicular to the surface of the circuit board 2 and also coincides with the light emitting portion 56. Therefore, two color light emission points 5
6 are arranged in a direction orthogonal to the paper surface. The two colors can be individually blinked, and the two colors can be turned on at the same time to form a mixed color. Center line 55 of light emitting element 41
The emitted light emitted along with is incident at a right angle to the light receiving surface 15 and is in a linear state without being affected by the refractive index, and the first inclined surface 16-1 and the second inclined surface 16-2 immediately above are directly incident. The boundary line 71 is reached.

At the intersection of the boundary line 71 and the center line 55, a line perpendicular to the first inclined surface 16-1 is defined as the normal line 51. The angle θ1 formed by the center line 55 and the normal line 51 is set to 40 °, which is larger than the total reflection angle 39 ° 7 ′ described above. That is, the inclination angle formed by the first inclined surface 16-1 with respect to the light receiving surface 15 in the second light guide 12-2 is also 40 °.

The second inclined surface 16 on the rear side from the boundary line 71
-2, the angle θ2 with the center line 55 is 30 °
Is set to. That is, the inclination angle formed by the second inclined surface 16-2 with respect to the light receiving surface 15 in the light guide 12-2 is 4 degrees formed by the first inclined surface 16-1 on the front surface side.
It becomes 60 °, which is larger than 0 °.

In each of the following figures, the light emitting element 4
The emitted light emitted from the light emitting portion 56 of No. 1 toward the space is refracted depending on the refractive index of the synthetic resin due to the light emitting element 41 being molded with the transparent resin,
The size of the light emitting element 41 is extremely small, and therefore,
Since the distance between them is very small and it does not make the essential understanding of the present invention unreasonable, it is assumed that the path of the emitted light during this time is emitted straight to the space.

FIG. 18 shows the incident light reaching the first inclined surface 16-1 typically in the vicinity of both ends. The incident light incident on the light receiving surface 15 is refracted at each incident point as shown by the difference in refractive index from the space, and is incident into the second light guide body 12-2.

First inclined surface 16-1 and second inclined surface 16
The front side from the center line 55 passing through the boundary line 71 with -2 is
Incident light at a reflection point 57 near that point is totally reflected, travels straight in the light guide section 17, and reaches the light guide section end face 58 of the light guide section 17.

Incident light at a reflection point 59 distant from the center line 55 is totally reflected and totally reflected again at a reflection point 61 on the upper surface of the light guide portion 17, and goes straight inside the light guide portion 17 to end face the light guide portion. 58.

Between these reflection points 57 and 59,
The same total reflection is performed on each of them and reaches the end surface 58 of the light guide portion. The fact that the light is totally reflected as described above will be easily understood from the above description without intentionally explaining it in detail, and therefore the description thereof is omitted here.

FIG. 19 shows the incident light reaching the second inclined surface 16-2 typically in the vicinity of both ends. The incident light incident on the light-receiving surface 15 is refracted at each incident point as shown by the difference in refractive index from the space, and is incident on the second light guide 12-2.

First inclined surface 16-1 and second inclined surface 16
The rear side from the center line 55 passing through the boundary line 71 with -2 is
Incident light at a reflection point 75 near that point is totally reflected and travels straight in the light guide portion 17 and is totally reflected again at a reflection point 76 in the middle of the upper surface of the light guide portion 17 to reach the light guide portion end face 58. .

Incident light at a reflection point 77 distant from the center line 55 is totally reflected and goes straight in the light guide portion 17 to guide the light.
The light is totally reflected again at the reflection point 78 on the front side of the upper surface of the light source 7, and reaches the end surface 58 of the light guide portion.

Between these reflection points 75 and 77,
The same total reflection is performed on each of them and reaches the end surface 58 of the light guide portion. The second inclined surface 1 so as to be totally reflected as described above.
That is, the inclination angles of 6-2 are all set to be equal to or greater than the critical angle with respect to the incident angle of each incident light.

FIG. 20 shows the incident light incident on the second light receiving surface 23, typically at both ends thereof. As is apparent from the figure, the second light receiving surface 23 has a light emitting portion 56.
The tilt angle is set so as to be substantially opposite to. Therefore, the incident light that is incident is only slightly affected by the difference in the refractive index from the space, and travels into the light guide section 17 in a state that is almost straight.

The incident light incident on the lower end portion of the second light receiving surface 23 in the figure is totally reflected at a reflection point 62 on the front side of the upper surface of the light guide portion 17 and reaches the end surface 58 of the light guide portion. The incident light that has entered the upper end of the second light receiving surface 23 in the figure is totally reflected at a reflection point 63 in the middle of the upper surface of the light guide 17 and reaches the light guide end surface 58.

As described above, most of the incident light incident on the front side from the center line 55 is effectively totally reflected by each surface and reaches the end surface 58 of the light guide portion. Also from the center line to the back side, the incident light traveling toward the second inclined surface 16-2 is totally reflected and reaches the light guide portion end surface 58 in the same manner, and all of them are superposed, so that the light emitted from here is emitted. It is clearly visible.

As described above with reference to FIG. 17, this means that the center line 55 and the normal line 5 to the first inclined surface 16-1 are equal to each other.
That is, the angle formed with 1 is set slightly larger than the critical angle. Further, the incident light which is incident from the light receiving surface 15 and reaches the lower end portion of the second inclined surface 16-2 is also set in the same manner although a detailed description thereof is omitted. Therefore, the first and second inclined surfaces 16-
The angles formed by the incident rays and the normals at the reflection points 1 and 2 are all equal to or greater than the critical angle.

The emitted light emitted from the second inclined surface 16-2 to the back side will be described with reference to FIG.
Light emitted from the light emitting element 41 is incident on the light receiving surface 15 at a position contrasting with FIG.
The part above 2 is transmitted because it is below the critical angle, and is leaked to the outside as shown by an arrow 79.

As described with reference to FIG. 20, the second light receiving surface 23
Light emitted in a direction symmetrical to is totally reflected by the surface of the locking piece portion 18 which is an extended surface of the light receiving surface 15 and is indicated by the arrow 6
As shown in 6, the light is radiated to the back side space.

In this way, the emitted light emitted from the second inclined surface 16-2 in the back direction is emitted to the space. The above and the combined state of the light path relationship between the light emitting element 41 and the second light guide 12-2 shown in FIGS. 18 to 20 are shown in FIG. Here, the individual descriptions are as described with reference to the respective drawings, so refer to the above description together with the drawings as necessary.

In FIG. 22, the light guide end face 58 of the light guide 12 is shown.
Is used as the light-scattering surface, and each aspect will be described below. In the following description of the present invention, the light guide body is represented by the reference numeral 12 as a whole, including the first light guide body 12-1 and the second light guide body 12-2 described above. To

FIG. 10A is a side view, and the end face 58 of the light guide portion.
On the surface of the fine particle as the light scattering surface 81, for example,
Transparent glass spheres of several μm to several tens of μm, or similar synthetic resin spheres, made into a thin layer and mixed together, or molded integrally, or made into a thin layer of fine flakes of the same material. The light-scattering surface 81 is mixed and integrally molded.

By doing so, when the introduced light is emitted from the end face 58 of the light guide portion, it is not simply transmitted,
Since it is scattered, for visual observation from the outside on the front side,
You can see clearly from all directions.

The front view partial view of FIG. (B) shows a second embodiment, in which small and relatively flat regular pyramids each having a side of 0.1 to 0.5 mm square are continuously molded and integrated. A scattering surface 82 is formed by the above, and a side cross section is shown in FIG.

Since the outgoing light is refracted and scattered by the inclined surface, the scattering surface 82 can be clearly confirmed from all directions. When viewed from the front, the continuous direction is not limited to the upper, lower, left, and right directions, and it is also possible to set it in an oblique direction. , The scattering direction can be changed, and it becomes easier to recognize.

The front view partial view of FIG. (D) is a third mode, and is a honeycomb shape in which minute and relatively flat regular hexagonal pyramids inscribed in a circle of about 0.3 to 0.8 mm are continuously formed. (E) is a cross-sectional view of the light-scattering surface 83 that is integrally molded into the above.

Since the outgoing light is refracted and scattered in multiple directions by the inclined surface, the scattering surface 83 can be clearly confirmed from all directions. If the height of the hexagonal pyramid is not flat but is appropriately increased, the scattering direction can be changed, and it becomes easier to recognize.

In the above-mentioned embodiment, the projection is a quadrangular pyramid or a hexagonal pyramid, but it is of course possible to form a concave shape instead of the projection. In addition, any shape that can be continuously used, such as a regular triangular pyramid, may be used, and a spherical convex body can also be used.

FIG. 23 is a perspective view of a second embodiment of the display device of the present invention, which is shown in a separated state as seen from the back surface side. The display device 91 is composed of three light guides 12 and one light guide holding member 92, all of which are synthetic resin molded products and are integrated.

In the figure, the light guide 12 faces a light emitting element arranged on a circuit board (not shown), and has a light receiving surface 15 on which the light emitted from the light emitting element is made incident, and a light receiving surface 15 is made incident. It is provided with an inclined surface 16 for reflecting incident light toward the front surface, a light guide portion 17 for guiding the incident light to the front surface side, and a flat locking piece portion 18 projectingly formed on the rear surface side. , An optically colorless and transparent synthetic resin, for example, polycarbonate, acrylic resin, etc., can be arbitrarily selected.

The light receiving surface 15 is parallel to the surface of the circuit board, and the inclined surface 16 is given an optimum inclination angle on the light receiving surface 15. The light guide portion 17 has a rectangular cross section and extends in a direction parallel to the light receiving surface 15. It seems that the lower surface of the locking piece portion 18 coincides with the extension surface of the light receiving surface 15, and the upper surface continues to the lower end on the rear surface side of the inclined surface 16.

Although not shown, hemispherical locking projections 21 are formed in two lines on the upper surface of the back side of the locking piece portion 18, and the lower surface side has a chamfered inclined surface 22. Is formed in.

The front surface side of the light receiving surface 15 is a second light receiving surface 23 extending at a predetermined angle in the circuit board direction, that is, on the lower side. The light receiving surface 15, the inclined surface 16, the chamfered inclined surface 22, and the second light receiving surface 23 have a wide width in a plan view and the light guiding portion 17 has a narrow width in a plan view. Therefore, the intermediate portion is continuously formed by the tapered surface 24 having a relatively gentle side surface in plan view and the lower inclined surface 25.

The light guide holding member 92 for receiving and holding the light guide 12 is, as shown in the figure, formed by a box-shaped main body 93 and a partition wall 94 that divides the main body 93 into three equal parts. The light guide housing portion 95 is provided at three positions, the leg portion 28 that is laterally extended at diagonal positions on both side surfaces, and the engaging portion 29 that projects downward in the central portion of the leg portion 28. I have it.

A rectangular frame-shaped front side opening 31 into which the light guide section 17 of the light guide body 12 is fitted is provided on the front side of each of the three light guide body accommodating sections 95 of the main body section 93. A flat frame-shaped rear side opening 32 into which the stopper piece 18 is fitted,
Are formed.

On the front side and the back side of the back surface of the main body 93,
Protrusions 34 are formed so as to coincide with the bottom surface 33 of the leg portion 28, and the posture is stabilized so that rattling does not occur when the leg portion 28 is attached to the circuit board.

A notch 35 is formed in the upper surface of the front opening 31 of the main body 93, and a notch 36 is formed in the upper surface of the rear opening 32.
Is respectively provided in the same way as that shown in FIG.

The light guide holding member 92 is formed by molding polybutylene terephthalate (PBT), which is excellent in various mechanical and electrical properties such as moldability and elasticity.

The light guide 12 and the light guide holding member 92 can be assembled by referring to the assembly procedure of FIG. That is, the reference numeral of the light guide holding member 14 in FIG. 3 indicates the light guide holding member 9 in the present embodiment.
It will be easily understood by substituting 2.

FIG. 23 shows a state where one light guide 12 is already assembled on the left end side in the drawing. Further, FIG. 24 shows a perspective view from above, which is assembled as described above.

Also in this embodiment, the form of the engaging portion as shown in FIGS. 6 and 7 can be arbitrarily applied as appropriate. Further, the same can be applied to the forms of the first light guide 12-1 of FIG. 10, the second light guide 12-2 of FIG. 16, and the like. Furthermore, the form of the scattering surface on the front surface of the light guide body shown in FIG. 22 can of course be applied.

In any case, since it is a display device having a display unit capable of collectively handling a plurality of light emitting elements, it is easy to mount on a circuit board and the mounting space is effective. it can.

In this embodiment, the number of the light emitting elements and the number of the light guides 12 are typically three, but it is of course included in the present invention that the number of the light emitting elements and the number of the light guides 12 are two or more. FIG.
5 is a perspective view of a third embodiment of the display device of the present invention, which is shown in a separated state as viewed from the back surface side. Display device 10
Reference numeral 1 includes a light guide body 102 in which three are connected and one light guide body holding member 103, all of which are synthetic resin molded products and are integrated.

In the figure, the light guide body 102 faces a light emitting element arranged on a circuit board (not shown), and a light receiving surface 15 on which the light emitted from the light emitting element is incident, and an incident light incident from the light receiving surface 15. The inclined surface 16 for reflecting light toward the front surface, the light guide portion 17 for guiding the incident light to the front surface side, and the flat locking piece portion 18 projectingly formed on the back surface side are provided. Connecting part 104 for connecting the stop pieces 18 to each other
Are arranged in parallel at a predetermined interval, and are optically colorless and transparent synthetic resin, for example, polycarbonate, acrylic resin,
It can be arbitrarily selected from the others.

The light receiving surface 15 is parallel to the surface of the circuit board, and the inclined surface 16 is given an optimum inclination angle on the light receiving surface 15. The light guide portion 17 has a rectangular cross section and extends in a direction parallel to the light receiving surface 15. It seems that the lower surface of the locking piece portion 18 coincides with the extension surface of the light receiving surface 15, and the upper surface continues to the lower end on the rear surface side of the inclined surface 16.

Although not shown, a hemispherical locking protrusion 21 is formed at two positions on the upper surface of the back side of the locking piece portion 18, and the lower surface side has a chamfered inclined surface 22. Is formed in.

The front surface side of the light-receiving surface 15 is a second light-receiving surface 23 extending at a predetermined angle in the circuit board direction, that is, on the lower side. The light receiving surface 15, the inclined surface 16, the chamfered inclined surface 22, and the second light receiving surface 23 have a wide width in a plan view and the light guiding portion 17 has a narrow width in a plan view. Therefore, the intermediate portion is continuously formed by the tapered surface 24 having a relatively gentle side surface in plan view and the lower inclined surface 25.

The light guide holding member 103 that receives and holds the light guide 102 is, as shown in the drawing, formed by a box-shaped main body 105 and a partition wall 94 that divides the main body 105 into three equal parts. Three light guide housing portions 95 to be formed,
Notch 106 that avoids the connecting portion 104 of the light guide 102
And the leg portions 28 that are laterally extended at diagonal positions on both sides.
And an engaging portion 29 projecting downward in the center of the leg portion 28,
It has

Three light guide housings 95 of the main body 105
A rectangular frame-shaped front side opening 31 into which the light guide portion 17 of the light guide body 102 is fitted, and a flat frame-shaped rear side opening 32 into which the locking piece portion 18 is fitted into the back side.
And are formed.

Protrusions 34 are formed on the front side and the rear side of the back surface of the main body portion 105, respectively, which coincide with the bottom surface 33 of the leg portion 28, so as to prevent rattling when attached to a circuit board. The posture is stabilized.

Notch 35 in the upper surface of front side opening 31 of main body 105 and notch 3 in the upper surface of rear side opening 32.
The fact that 6 is provided for each is the same as that shown in FIG.

The light guide holding member 103 is formed by molding polybutylene terephthalate (PBT), which has various mechanical and electrical properties such as moldability and elasticity.

The light guide body 102 and the light guide body holding member 103.
To assemble and, the assembly procedure of FIG. 3 can be referred to. That is, the light guide 12 in FIG.
It will be easily understood by replacing the reference numerals of the light guide holding member 14 with the light guide 102 and the light guide holding member 103 in the present embodiment.

According to the present embodiment, since the three light guides 102 connected to each other can be assembled at once, the time for the assembling process can be shortened and it is also suitable for the assembly by the automation device. . The state of the assembled top view is the same as that of FIG.

Also in this embodiment, the form of the engaging portion as shown in FIGS. 6 and 7 can be arbitrarily applied. Further, the same can be applied to the forms of the first light guide 12-1 of FIG. 10, the second light guide 12-2 of FIG. 16, and the like. Furthermore, the form of the scattering surface on the front surface of the light guide body shown in FIG. 22 can of course be applied.

In any case, since it is a display device having a display section capable of collectively handling a plurality of light emitting elements, it is easy to mount on a circuit board and the mounting space can be made effective. What can be done is the same as in the second embodiment.

In this embodiment as well, the light emitting element and the light guide body 102 are typically connected in threes, but it is of course included in the present invention that an arbitrary number of combinations of two or more are connected. In the case of connecting a plurality of parts, by forming the locking projections 21 only on both ends, the assembling property is facilitated and improved.

Although the light guide in the present invention is colorless and transparent, it is not limited to such a material, and if desired, it may be made of a material colored in an appropriate color and an appropriate concentration. , Is included in the present invention.

The material of the light guide holding member in the present invention is
PBT is preferably shown as a representative, but the present invention is not limited to this, and other ABS, polyamide resin, acetal resin, other synthetic resin,
Materials having good moldability, elasticity, mechanical properties, electrical properties, cost, etc. can be selected and applied. Further, the color is not limited in any range as long as it does not affect the light leakage to the adjacent light guide.

[0139]

As described above in detail, the display device of the present invention basically has a light-receiving surface which faces a light-emitting element arranged on a circuit board and which receives light emitted from the light-emitting element. , An inclined surface for reflecting the incident light incident from the light receiving surface toward the front surface, a light guide portion for guiding the incident light to the front surface side, and a flat locking piece portion protrudingly formed on the rear surface side. , A light guide made of an optically transparent synthetic resin molded product,
A front opening that allows the light guide section of this light guide to be fitted inside to look into the front surface, a rear opening that fits the locking piece of the light guide into the back side, and a circuit board A light guide holding member made of a synthetic resin molded product, which is provided with an engaging portion for locking the light guide, and the light guiding portion of the light guide is fitted into the front opening of the light guide holding member to guide the light. Since the locking piece portion of the light guide is fitted and locked in the opening on the back side of the body holding member, the assemblability is good and the handling as a single component is stable.

The light emitting element can be mounted and arranged on a circuit board such as a printed wiring board at the same time as other circuit parts.
The display device can be attached to the circuit board by a one-touch method if necessary. In addition, the attached positional accuracy is maintained accurately.

In addition to the above basic configuration, the inclination angle of the inclined surface with respect to the light-receiving surface of the light guide is set so that the rear side from the upper side of the light emitting element is larger than the front side of the light emitting element. The incident light on the side can be totally reflected and guided to the light guide section on the front side, and the display light can be further increased.

In addition to the above basic structure, by extending the front side of the light receiving surface of the light guide body in the direction of the circuit board,
It becomes possible to eliminate the portion of the front surface of the light receiving surface that is totally reflected and does not enter the light guide body, and the emitted light can be effectively incident, and the display light can be further increased.

In addition to the above-mentioned basic structure, the light guide holding member may be protruded to both sides of the engaging portion of the light guide holding member by a diameter larger than the diameter of the insertion hole for attachment of the circuit board and pushed into the insertion hole for attachment. By providing a protrusion that can be compressed and deformed and inserted, the engaging part has an automatic centering function that is automatically set to the center position with respect to the mounting insertion hole. Accurate positioning is possible without any positional deviation.

In addition to the above basic structure, the number of engaging portions of the light guide holding member is two on both sides, which is the minimum number, so that the work of mounting on the circuit board is easy. Nevertheless, good positioning accuracy can be obtained.

In addition to the above basic structure, by making the end surface of the light guide portion of the light guide a light scattering surface, it becomes easier to recognize the light emitted from the end surface of the light emitting element in a lighting state more clearly. In addition, it is possible to recognize a wide range from directions.

As described above, various excellent practical effects can be obtained. With regard to the number of indications, it is possible to integrate a plurality of pieces other than a single piece, and there is also a remarkable effect that the efficiency of assembling, mounting, and mounting space can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view (part 1) of a separated state of a first embodiment of a display device of the present invention.

FIG. 2 is a separated perspective view (part 2) of the first embodiment of the display device of the present invention.

FIG. 3 is a side view showing an assembly procedure of the display device of the present invention.

FIG. 4 is a perspective view of an essential part of a state in which the display device of the present invention is attached to a circuit board.

FIG. 5 is a plan view cross-sectional view of the display device of the present invention in an attached state.

FIG. 6 is a detailed structure (1) of the display device engaging portion of the present invention.

FIG. 7 is a detailed structure (part 2) of the display device engaging portion of the invention.

FIG. 8 is a state in which the display device engaging portion of the present invention is attached to a circuit board.

FIG. 9 is a relationship between a light guide and incident light of the display device of the present invention.

FIG. 10 is a perspective view of an embodiment of the first light guide according to the present invention.

FIG. 11 is a positional relationship diagram of the first light guide of the invention and the light emitting element.

FIG. 12 is an explanatory diagram of an optical path passing through an inclined surface in the first light guide according to the invention.

FIG. 13 is an explanatory diagram of an optical path passing through a second light receiving surface in the first light guide of the invention.

FIG. 14 is an explanatory diagram of a rear side optical path from the center line in the first light guide according to the invention.

FIG. 15 is a plan view of the first light guide according to the present invention.
It is a synthetic | combination figure of the optical path of.

FIG. 16 is a perspective view of an embodiment of a second light guide according to the present invention.

FIG. 17 is a positional relationship diagram of the second light guide of the invention and the light emitting element.

FIG. 18 is an explanatory diagram of an optical path passing through a first inclined surface in the second light guide according to the invention.

FIG. 19 is an explanatory diagram of an optical path passing through a second inclined surface in the second light guide according to the invention.

FIG. 20 is an explanatory diagram of an optical path passing through a second light receiving surface in the second light guide of the invention.

FIG. 21 is a view showing a second light guide according to the invention in FIGS.
It is a synthetic | combination figure of the optical path of.

FIG. 22 is an embodiment of a light scattering surface of the light guide according to the present invention.

FIG. 23 is a perspective view showing a separated state of a second embodiment of the display device of the present invention.

FIG. 24 is an assembled perspective view of the second and third embodiments of the display device of the present invention.

FIG. 25 is a perspective view showing a separated state of a third embodiment of the display device of the present invention.

FIG. 26 is a schematic perspective view of a main part of a printed wiring board unit.

FIG. 27 is a perspective view of a main part of a conventional display device.

FIG. 28 is a plan view cross-sectional view of a conventional display device in a mounted state.

[Explanation of symbols]

 1 Printed Wiring Board Unit 2 Printed Wiring Board 3 Plug-in Connector 4 Surface Plate 5 Window Hole 11 Display Device 12 Light Guide 12-1 First Light Guide 12-2 Second Light Guide 14 Light Guide Holding Member 15 light receiving surface 16 inclined surface 16-1 first inclined surface 16-2 second inclined surface 17 light guide portion 18 locking piece portion 21 locking protrusion 22 chamfered inclined surface 23 second light receiving surface 24 taper surface 25 Lower inclined surface 27 Main body portion 28 Leg portion 29 Engagement portion 31 Front side opening 32 Back side opening 33 Bottom surface 34 Protrusion 35, 36 Notch 37 Back side wall 41 Light emitting element 42 Mounting insertion hole 45 Shaft portion 46 Locking Part 47 Slit 48 Protrusion 51 Normal line 52 Incident ray 53 Refracted ray 54 Reflected ray 55 Center line 56 Light emission point 57 Reflection point 58 Light guide end face 59, 61, 62, 63 Reflection point 6 , 66 arrow 71 boundary line 75, 76, 77, 78 reflection point 79 arrow 81, 82, 83 light scattering surface 91 display device 92 light guide holding member 93 main body part 94 partition wall 95 light guide housing part 101 display device 102 Light guide 103 Light guide holding member 104 Connecting part 105 Main body 106 Notch part

Claims (6)

[Claims] 1. A light-emitting element arranged on a circuit board, a light-receiving surface on which light emitted from the light-emitting element is incident, an inclined surface for reflecting the incident light incident on the light-receiving surface toward a front surface, and the light-receiving element. A light guide body made of an optically transparent synthetic resin molded product having a light guide section for guiding the emitted light to the front side and a flat locking piece section projectingly formed on the back side; A front side opening for fitting the optical part inside and looking into the front side; a rear side opening for fitting the locking piece part for engaging the rear side and an engaging part for engaging and locking the circuit board. The light guide body holding member made of a synthetic resin molded product, and the light guide portion of the light guide body is fitted into the front side opening of the light guide body holding member to guide the light to the rear side opening of the light guide body holding member. A display device in which a locking piece portion of a body is fitted and locked. 2. The display device according to claim 1, wherein the angle of inclination of the inclined surface with respect to the light receiving surface of the light guide is larger from directly above the light emitting element to the back side than the front side. 3. The display device according to claim 1, wherein a front surface side of the light receiving surface of the light guide extends in a circuit board direction. 4. The light guide holding member is inserted into the engaging portion of the light guide holding member by being compressed and deformed by being protruded on both side surfaces symmetrically about the center and larger than the diameter of the mounting insertion hole of the circuit board and being pushed into the mounting insertion hole. The display device according to claim 1, further comprising a protrusion for obtaining the projection. 5. The display device according to claim 1, wherein the light guide holding member has two engaging portions on both sides. 6. The display device according to claim 1, wherein an end surface of the light guide portion of the light guide body is a light scattering surface.