JP2549856Y2 - Light emission guide - Google Patents

Description

[Detailed description of the invention]

[0001]

This invention reflects the light introduced from the back side to the front end side and the rear end side on the reflecting surface formed inside, and emits light from the surface over the entire length to improve visibility. It is related to the emitted light guide.

[0002]

2. Description of the Related Art In an instrument such as a vehicle, a pointer for instructing a predetermined speed or a number of revolutions by rotating on a dial is made of a transparent material, especially for improving visibility at night, and is composed of a character. In some cases, light from a light source disposed on the back side of the board is introduced to cause the pointer itself to emit light over its entire length.

FIG. 5 shows a pointer 1 having a light emitting function and a light source 3 for supplying light to the pointer 1. Guideline 1
The light from the light source 3 is introduced from the light introducing unit 5, and the introduced light is reflected by the distal-end-side reflecting surface 9 formed by the space 7 having a triangular cross section formed therein.
In addition, the light is reflected by the rear end side reflection surface 13 and guided to the rear end 15 of the pointer, so that light is emitted from the light emitting surface 17 of the pointer 1. At this time, a part of the light from the light source 3 passes through the two reflecting surfaces 9 and 13 and proceeds straight as it is, and is emitted to the outside from the light emitting surface 17 of the pointer 1 via the upper surface 19 of the space 7. Thereby, the pointer 1 emits light over the entire length from the front end 11 to the rear end 15, and the visibility is improved.

In this case, however, the two reflecting surfaces 9, 1
Light that passes through the light 3 and is emitted to the outside from the light emitting surface 17 of the pointer 1 passes through the space 7, causing uneven brightness to other parts, and thus it is not possible to obtain uniform luminance over the entire pointer 1. There is a problem.

For this reason, conventionally, as shown in FIG.
A dimming piece 21 made of a polycarbonate resin or the like and having substantially the same shape as the space 7 is incorporated in the space 7 of the hand 1 so as to make the brightness uniform over the entire length of the hand 1.

[0006]

However, in such a conventional light emitting pointer, the light control piece 21 incorporated in the space 7 of the pointer 1 has an amount of light introduced through the light introducing section 5. It is difficult to make the pointer uniform, and furthermore, since the matching surfaces 21a and 21b are in contact with the two reflection surfaces 9 and 13 of the pointer 1 to form reflection surfaces, the shape of the reflection surface becomes uneven, and the pointer 1 becomes uneven over the entire length. Therefore, it is difficult to maintain a uniform brightness.

Therefore, the present invention aims at maintaining uniform brightness over the entire length of the pointer.

[0008]

In order to achieve the above object, the present invention provides a light introducing portion on the side opposite to the light emitting surface, and reflects light introduced from the light introducing portion in the longitudinal direction of the pointer. A space provided with a reflecting surface that partially transmits the light is provided in a state where both sides of the pointer are open, and the reflecting surface and the light emitting surface are in the traveling direction of light introduced from the light introducing unit. In the light emitting pointer provided with a filter member in the space portion between the light emitting portions, the filter member shields the light so as to change an amount of light transmission according to luminance unevenness that may occur on a light emitting surface due to light passing through the space portion. In the state of a processed film, attached to the hands, the hands are provided with protrusions that protrude from the open side portions of the hands. Projected on the pointer It is constituted of projections to be locked and fixed is formed.

[0009]

According to the light emitting pointer having such a configuration, the light introduced from the light introducing portion is reflected by the reflecting surface, guided in the longitudinal direction of the pointer, and emitted from the light emitting surface on the surface of the pointer. Also,
Part of the light introduced from the light introduction unit passes through the reflection surface and reaches the filter member via the space. The filter member is light-shielded so as to change the amount of light transmission according to the brightness unevenness that can occur on the light emitting surface when light passes through the space, eliminating the uneven brightness of light emitted from the light emitting surface. In addition, since the brightness becomes uniform over the entire length of the pointer and the film has a simplified shape, it is easy to manufacture and shade itself, which is optimal for mass production. Further, since the filter member is fixed to the both ends of the pointer in the longitudinal direction of the protrusion at the protrusions protruding to both sides of the pointer, the protrusion formed in the longitudinal direction is fixed to the pointer by being locked. Fixing to the pointer can be easily performed independently without performing.

[0010]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a pointer 23 made of a transparent material and having a light emitting function, and a light source 25 for supplying light to the pointer 23 according to an embodiment of the present invention.
Is a perspective view of a main part of the pointer 23. FIG. The pointer 23 is formed such that a light introducing portion 27 for introducing light from the light source 25 disposed on the back side thereof into the inside protrudes to the back side. Inside the pointer 23 on the front side in the light traveling direction of the light introducing section 27, an inverted triangular space portion 29 is formed in a penetrating state in which both sides of the pointer 23 are open, that is, in a direction perpendicular to the paper surface in FIG. Is formed in a state penetrating through.

By forming the above-mentioned inverted triangular space portion 29, a tip-side reflecting surface 33 which reflects light from the light source 25 toward the tip 31 side of the pointer 23 and partially transmits the light.
Similarly, a rear-end-side reflection surface 37 that reflects light so as to guide the light toward the rear end 35 of the pointer 23 and partially transmits light is formed. The light guided to the front end 31 side and the rear end 35 side is radiated outside from the light emitting surface 39 on the surface of the pointer 23.

A filter member 43 is provided near the upper surface 41 in the space 29 as shown in FIG. The filter member 43 has been subjected to light-shielding processing by applying so-called halftone dot printing to a transparent film by countless dots or meshes. This light-shielding processing is performed by the light-emitting surface 39 when light passes through the space 29. The amount of transmitted light changes in accordance with possible uneven brightness. Specifically, the amount of transmitted light changes along the longitudinal direction of the pointer 23 connecting the leading end 31 side and the trailing end 35 side of the pointer. For example,
When the brightness of the light emitted from the light emitting surface 39 through the space 29 is high near the center in the left-right direction in FIG. 1 and lower on both the left and right sides, as shown in FIG. Is increased most near the center in the left-right direction to reduce the amount of light transmission, while increasing gradually toward the left and right sides to increase the amount of light transmission.

The filter member 43 has a width P corresponding to the width of the pointer 23 formed to be larger than the width A of the portion where the upper surface 41 of the space 29 of the pointer 23 is formed, and protrudes from both sides of the pointer 23. In addition to the portion 43b, four protrusions 43a that protrude in the longitudinal direction and are locked and fixed to the pointer 23 are formed on both ends in the longitudinal direction of the pointer 23 in the protrusion 43b. Also, the upper surface 4 of the space 29
The length B in the longitudinal direction of the pointer 23 in 1 is substantially the same as the length Q excluding the protrusion 43a of the filter member 43. When the filter member 43 thus formed is attached to the space 29 in a state of being close to the upper surface 41 of the space 29, the projections 43a at the four corners are exposed to the outside of the hands 23, and the projections 43a are prevented from coming off. Locked and fixed.

In the light emitting pointer thus configured, the light from the light source 25 is reflected by the two reflecting surfaces 33 and 37, respectively, guided to the pointer leading end 31 side and the pointer rear end 35 side, and guided light. Are emitted from the light emitting surface 39 of the pointer 23. Part of the light that has reached the two reflecting surfaces 33 and 37 passes through the two reflecting surfaces 33 and 37 respectively, travels straight, and reaches the filter member 43 via the space 29.

The filter member 43 changes the amount of light transmission in accordance with the luminance unevenness that can occur on the light emitting surface 39 when light passes through the space 29, so that the light travels straight from the space 29 via the filter member 43. The light emitting surface 39 of the pointer 23
The uneven brightness of the light emitted from the light source is suppressed, and the brightness of the light emitted from the light emitting surface 39 is made uniform over the entire length of the pointer 23.

As described above, since the luminance unevenness can be suppressed by the filter member 43, restrictions on the shape of the pointer 23, particularly the shape of the reflecting surface thereof, and the prism shape up to the pointer light receiving portion are relaxed, and a fine improvement in luminance balance can be achieved. It will be easier. Further, since the filter member 43 has a simplified shape such as a film shape, it is easy to manufacture the filter member itself and to perform light-shielding treatment by halftone printing, which is optimal for mass production, and can contribute to a reduction in manufacturing cost. Guideline 2
The protrusions 4 protruding in the longitudinal direction are provided at both ends in the longitudinal direction of the pointer in the protruding portions 43b protruding from both sides of the pointer 3.
Since 3a is locked and fixed to the pointer 23, the fixing to the pointer 23 can be easily performed independently without using another member.

In the above embodiment, the filter member 43 is used.
Changed the amount of light transmitted by halftone dot printing.
The same effect can be obtained by printing a color such as white, gray, red, yellow or the like in accordance with the emission color of No. 3.

[0019]

As described above, according to the present invention, the light from the light source is applied to the space in the pointer provided with the reflecting surface for reflecting the light from the light source toward the longitudinal direction of the pointer. A light-shielding film-shaped filter member is provided to change the amount of light transmission according to the luminance unevenness that may occur on the light-emitting surface by passing the light, so that light transmitted through the reflection surface passes through the filter member, and light is emitted. Since uneven brightness of light emitted from the surface can be suppressed, brightness uniformity can be easily achieved over the entire length of the pointer, and since the filter member has a simplified shape of a film, It is easy to manufacture and shade itself, is optimal for mass production, and can contribute to a reduction in manufacturing cost. Further, since the filter member is fixed to the both ends of the pointer in the longitudinal direction of the protrusion at the protrusions protruding to both sides of the pointer, the protrusion formed in the longitudinal direction is fixed to the pointer by being locked. The fixing to the pointer can be easily performed independently without performing.

[Brief description of the drawings]

FIG. 1 is a side view of a pointer in a state where light is introduced from a light source, showing one embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a main part of the pointer of FIG. 1;

FIG. 3 is a perspective view of a filter member mounted on the pointer of FIG. 1;

FIG. 4 is an explanatory diagram showing the density of halftone dot printing along the longitudinal direction of the hands in the filter member of FIG. 3;

FIG. 5 is a side view of a pointer in a state where light is introduced from a light source, showing a conventional example.

6 is a perspective view of a main part of the pointer of FIG. 5 and a light control piece attached to a space of the pointer.

[Explanation of symbols]

 23 pointer 27 light introducing section 29 space section 31 pointer tip 33 tip side reflective surface 35 pointer rear end 37 rear end side reflective surface 39 light emitting surface 43 filter member 43a protrusion 43b protrusion

Claims (1)

(57) [Scope of request for utility model registration] 1. A space provided with a reflecting surface for providing a light introducing portion on the side opposite to the light emitting surface and reflecting light introduced from the light introducing portion in the longitudinal direction of the pointer and partially transmitting the pointer, Provided in a state where both sides of the light-emitting portion are open, in a light emitting pointer provided with a filter member in the space between the reflective surface and the light-emitting surface in the traveling direction of light introduced from the light introducing portion, The filter member is in the form of a film light-shielded so as to change the amount of light transmission according to luminance unevenness that can occur on the light emitting surface when light passes through the space, and is attached to the hands. In addition, a projection is provided that protrudes from the both sides of the pointer that is opened, and projections that protrude in the longitudinal direction and are fixed to the pointer are formed on both ends of the projection in the longitudinal direction of the pointer. Departure characterized by that Light pointer.