JPH0612995U - Luminous pointer - Google Patents

Abstract

(57) [Summary] [Purpose] To maintain uniform brightness over the entire length of the pointer 23. [Structure] The light introducing section 27 is provided on the side opposite to the light emitting surface 39,
A tip-side reflecting surface 33 that reflects the light introduced from the light introducing section 27 to the tip 31 side and partially transmits it, and a rear end that reflects the light introduced from the light introducing section 27 to the rear end 35 side and partially transmits it. A space portion 29 provided with each side reflection surface 37 is provided,
In the space 29 between the reflecting surfaces 33, 37 and the light emitting surface 39 in the traveling direction of the light introduced from the light introducing portion 27,
A filter member 43 is provided in which the amount of light transmission is changed according to the brightness unevenness that may occur on the light emitting surface 39 when light passes through the space 29.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a light emitting pointer in which light introduced from the back side is reflected by a reflecting surface formed inside to the front end side and the rear end side, respectively, and light is emitted from the surface over the entire length to improve visibility.

[0002]

[Prior art]

 In measuring instruments such as vehicles, the pointer that rotates on the dial to indicate a predetermined speed or number of revolutions is made of transparent material and placed on the back side of the dial to improve visibility especially at night. There is one in which light from the light source is introduced to cause the pointer itself to emit light over the 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. The pointer 1 introduces the light from the light source 3 from the light introduction part 5, reflects the introduced light on the tip side reflecting surface 9 formed by the space 7 having a triangular cross section formed inside, and the tip of the pointer 1 The light is emitted to the light emitting surface 17 of the pointer 1 while being guided to the 11 side, reflected by the reflecting surface 13 on the rear end side and guided to the rear end 15 side of the needle. At this time, a part of the light from the light source 3 passes through both the reflection surfaces 9 and 13 and goes straight on, and is emitted to the outside from the light emitting surface 17 of the pointer 1 through the upper surface 19 of the space 7. As a result, the pointer 1 emits light over the entire length from the front end 11 to the rear end 15, and the visibility is improved.

However, in this case, the light that has passed through both reflecting surfaces 9 and 13 and is emitted to the outside from the light emitting surface 17 of the pointer 1 passes through the space portion 7 and is thus transmitted to other parts. There is a problem that uneven brightness occurs and uniform brightness cannot be obtained in the entire pointer 1.

Therefore, conventionally, as shown in FIG. 6, a light control piece 21 formed of a polycarbonate resin or the like and having substantially the same shape as the space portion 7 is incorporated into the space portion 7 of the pointer 1 to The brightness is made uniform over the entire length.

[0006]

[Problems to be solved by the device]

 However, in such a conventional light emitting pointer, the dimming piece 21 incorporated in the space 7 of the pointer 1 makes it difficult to make the amount of light introduced through the light introducing section 5 uniform. Since the matching surfaces 21a and 21b contact the reflecting surfaces 9 and 13 of the pointer 1 to form the reflecting surfaces, the shape of the reflecting surface becomes non-uniform, and the pointer 1 is kept evenly and uniformly over the entire length. Has become difficult.

Therefore, the present invention aims to maintain uniform brightness over the entire length of the pointer.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a light-introducing portion on the side opposite to the light-emitting surface, and a light-reflecting surface that reflects light introduced from the light-introducing portion in the longitudinal direction of the pointer and partially transmits it. A space portion provided with, and light passes through the space portion in the space portion between the reflecting surface and the light emitting surface in the traveling direction of the light introduced from the light introducing portion. Thus, a filter member is provided in which the amount of light transmission is changed according to the uneven brightness that can occur on the light emitting surface.

[0009]

[Action]

 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 pointer surface. In addition, a part of the light introduced from the light introducing portion passes through the reflecting surface and reaches the filter member via the space. Since the filter member changes the amount of light transmission according to the brightness unevenness that occurs on the light emitting surface when light passes through the space, the brightness unevenness of the light emitted from the light emitting surface after passing through the space is uneven. Is eliminated by the filter member, and the brightness becomes uniform over the entire length of the pointer.

[0010]

【Example】

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

FIG. 1 shows an embodiment of the present invention, and 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. FIG. It is a perspective view of the principal part of 23. The pointer 23 is formed with a light introducing portion 27 for introducing light from a light source 25 arranged on the back side thereof to project to the back side. Inside the pointer 23 on the front side of the light entrance portion 27 in the direction of travel of light, an inverted triangular space portion 29 is formed so as to penetrate in a direction orthogonal to the paper surface in FIG.

By forming the space portion 29 in the shape of the inverted triangle, the light from the light source 25 is reflected so as to be guided to the tip 31 side of the pointer 23, and a part thereof is transmitted therethrough. A rear end side reflection surface 37 is formed to reflect the light so as to guide it to the rear end 35 side of the pointer 23 and partially transmit the light. The lights respectively guided to the front end 31 side and the rear end 35 side are emitted to the outside from the light emitting surface 39 on the surface of the pointer 23.

In the vicinity of the upper surface 41 in the space 29, as shown in FIG. 3, a transparent film is provided with a filter member 43 which is so-called halftone dot-printed with innumerable dots or meshes. The filter member 43 is subjected to halftone dot printing so that the amount of light transmission changes according to the brightness unevenness that may occur on the light emitting surface 39 when light passes through the space 29. Specifically, the amount of light transmission is changed along the longitudinal direction of the pointer 23 that connects the tip end 31 side and the back end 35 side. For example, when the brightness of the light passing through the space portion 29 and emitted from the light emitting surface 39 is high near the central portion in the left-right direction in FIG. 1 and is lower toward the left and right sides, as shown in FIG. , The density of halftone dots should be strongest near the center of the horizontal direction, and gradually decreased toward the left and right sides.

In the filter member 43, the width P corresponding to the width A of the portion where the upper surface 41 of the space portion 29 of the pointer 23 is formed is larger than the width A, and in the portion where the pointer P is large, Four protrusions 43 a protruding in the longitudinal direction of 23 are formed. The length B of the upper surface 41 of the space 29 is substantially the same as the length Q of the pointer 23. When the filter member 43 formed in this manner is mounted in the space 29 while 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 pointer 23, and the projection 43a becomes a stopper. Fixed.

In the light emitting pointer thus configured, the light from the light source 25 is reflected by both reflecting surfaces 33 and 37 and guided to the pointer front end 31 side and the pointer rear end 35 side, respectively. Light is emitted from the light emitting surface 39 of the pointer 23. A part of the light reaching each of the reflecting surfaces 33 and 37 passes through each of the reflecting surfaces 33 and 37, goes straight, and reaches the filter member 43 through the space 29.

Since the filter member 43 changes the amount of light transmission according to the uneven brightness that can be generated on the light emitting surface 39 when the light passes through the space 29, the filter member 43 is removed from the space 29. Through the straight line, the brightness unevenness of the light emitted from the light emitting surface 39 of the pointer 23 is suppressed, and the brightness of the light emitted from the light emitting surface 39 becomes uniform over the entire length of the pointer 23.

As described above, since the unevenness of brightness can be suppressed by the filter member 43, the restrictions on the shape of the pointer 23, especially the shape of its reflecting surface and the prism shape up to the pointer light receiving portion are alleviated, and the delicate brightness balance is improved. Will be easier.

In the above-described embodiment, the filter member 43 changes the amount of light transmission by halftone dot printing, but any color matching the emission color of the pointer 23, for example, white, gray, red or yellow. The same effect can be obtained by any color printing.

[0019]

[Effect of device]

 As described above, according to the present invention, the reflecting surface for reflecting the light from the light source in the longitudinal direction of the pointer is formed by the space portion formed inside the pointer, and the reflecting surface in the space portion is formed. A filter member was provided between the reflective surface and the light emitting surface of the pointer to change the amount of light transmission according to the uneven brightness that could occur on the light emitting surface due to light passing through the space. By passing the light through the filter member, it is possible to suppress uneven brightness of the light emitted from the light emitting surface of the pointer, and it is possible to easily achieve uniform brightness over the entire length of the pointer.

[Brief description of drawings]

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

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

FIG. 3 is a perspective view of a filter member attached to the pointer of FIG.

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

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

FIG. 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 Reflecting Surface 35 Pointer Rear End 37 Rear End Side Reflecting Surface 39 Light Emitting Surface 43 Filter Member

Claims (1)

[Scope of utility model registration request] 1. A light introducing portion is provided on the side opposite to the light emitting surface, and a space portion having a reflecting surface for reflecting the light introduced from the light introducing portion in the longitudinal direction of the pointer and partially transmitting the light is provided. In the space portion between the reflecting surface and the light emitting surface in the traveling direction of the light introduced from the light introducing portion, there is uneven brightness that may occur in the light emitting surface when light passes through the space portion. A light emitting pointer, characterized in that a filter member having a variable amount of light transmission is provided.