JP2010112933A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device capable of utilizing efficiently light from a light source. <P>SOLUTION: This display device 1 includes a display board 2 including a translucent index 21, a pointer member 5 for indicating the index 21 with a pointer 52, the light source 3 for illumination, a light guide member 4 for guiding irradiation light at the light source 3 to the pointer 52 and the index 21, and a reflection plate 6 for reflecting emission light from the light guide member 4 to the rear surface of the index 21. The light guide member 4 includes a cylinder part 41 for guiding the irradiation light at the light source 3 to the pointer 52, and a bending part 42 for guiding the light to the reflection plate 6. The cylinder part 41 through which a pointer shaft 51 of the pointer member 5 is inserted allows incident light from a lower end surface 41a to be emitted from an upper end surface 41b facing to the pointer 52. The bending part 42 extending from an outer circumferential surface of the cylinder part 41 to the outer edge side of the display board 2 allows incident light into a light receiving surface 42a arranged in parallel with the lower end surface 41a to be emitted from a light emitting surface 42c facing to the outer edge side of the display board 2. The light source 3 is arranged in the facing state to the lower end surface 41a and the light receiving surface 42a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a display device, and more particularly to a display device that includes a light guide member that guides light from a light source to a display plate, a pointer, and the like and functions as, for example, a vehicle meter.

In a vehicle, a display device that functions as a speed meter or an engine rotation speed meter is generally known, and various techniques have been introduced in order to improve display (lighting) quality (see, for example, Patent Document 1).
JP 2005-156503 A

  Incidentally, there are severe demands for improvement of display devices used for vehicles and the like, and a simple structure capable of reducing costs while always achieving a desired quality is always required. For example, in the technique disclosed in Patent Document 1, a desired display quality is realized by providing a plurality of light sources, but there is room for improvement in terms of cost.

  This invention is made | formed in view of such a condition, and it aims at providing the technique which can solve the said subject.

In order to achieve such an object, the display device of the present invention includes a display panel having a design portion and translucency, and a rotation axis that penetrates the display panel from the front surface side to the back surface side. A pointer member for rotating the pointer along the surface of the display plate, a light source disposed around the rotation shaft toward the back surface of the display plate, and irradiation light from the light source to the pointer and the design portion A light guide member for guiding, and a reflection plate disposed on the back surface side of the design portion and reflecting light emitted from the light guide member to the back surface of the design portion, wherein the light guide member includes the display plate A cylindrical portion that is disposed on the rear surface side of the rotating shaft and is inserted through the rotating shaft and that emits incident light from one end surface facing the light source from the other end surface facing the pointer, and a light receiving unit disposed side by side with the one end surface After extending on the outer peripheral surface of the cylindrical portion from the surface toward the display plate side And a bent portion that extends and bends toward the outer edge side of the display plate, and emits light incident on the light receiving surface from the light exit surface facing the outer edge side of the display plate toward the reflecting plate. .
Further, according to the present invention, the bent portion is arranged so as to be inclined with respect to the one end surface and faces the light source, and is directed from the outer peripheral surface side of the cylindrical portion toward the outer edge side of the display plate. And an internal reflection surface that reflects incident light from the light receiving surface and guides it to the light exit surface.

  ADVANTAGE OF THE INVENTION According to this invention, the display apparatus which can utilize the light of a light source efficiently can be provided.

  The best mode for carrying out the invention (hereinafter referred to as “embodiment”) will be described below with reference to the drawings. 1A and 1B are diagrams schematically illustrating a configuration of a display device 1 according to the present embodiment, in which FIG. 1A is a plan view and FIG. 1B is a cross-sectional view taken along line AA in FIG.

  As shown in FIG. 1, the display device 1 includes a display board 2 having translucency and provided with an index 21, a pointer member 5 that indicates the index 21 with a pointer 52, a light source 3 for illumination, a light source The light guide member 4 for guiding the irradiation light at 3 to the pointer 52 and the indicator 21 and the reflector 6 that reflects the light emitted from the light guide member 4 to the back surface of the indicator 21 are attached to the case 7. It functions as a vehicle speed meter.

  The display board 2 is formed of a light-transmitting synthetic resin, and has an indicator 21 for speed display on its surface as a design portion. In the center of the display plate 2, a through hole 22 through which a pointer shaft 51 of a pointer member 5 described later is inserted is provided. The display panel 2 is printed with a non-translucent colorant on the surface excluding the region where the index 21 is formed and the periphery of the through-hole 22, and a translucent colorant on the back surface.

  The case 7 accommodates the mounting portion 71 of the light guide member 4 described above, the mounting portion (not shown) of the reflection plate 6, and the wiring board (not shown) on which the light source 3 is mounted, and a speed measurement amount on the lower surface. Accordingly, a movement 72 for driving the pointer member 5 and a bracket (not shown) for attaching the case 7 to an instrument panel or the like of the vehicle are provided. The attachment portion 71 has a substantially U-shaped cross-sectional shape, and includes a flange portion 71a at one end extending upward on the outside.

  The pointer member 5 includes a pointer shaft 51 that penetrates the display plate 2 from the front surface side to the back surface side, and a pointer 52 that extends laterally from the upper end of the pointer shaft 51 along the surface of the display plate 2. The lower end of the pointer shaft 51 is fixed to the rotation shaft 72 a of the movement 72, and the pointer shaft 51 is rotated by driving the movement 72. The pointer 52 rotates about the pointer shaft 51 along the surface of the display plate 2 and indicates the indicator 21 of the display plate 2. A reflection surface (not shown) that reflects incident light from the lower surface side and guides it to the distal end side is provided at the proximal end portion of the pointer 52.

  The light source 3 is, for example, a surface mount type light emitting diode (LED), and is arranged around the pointer shaft 51 in an annular shape. The reflection plate 6 is disposed on the back side of the index 21 and reflects light emitted from the light exit surface 42 c (see FIGS. 2 to 4) of the bent portion 42 included in the light guide member 4 to the back surface of the index 21.

  FIG. 2 is an enlarged cross-sectional view of the light guide member 4 of the display device 1. FIG. 3 is a view showing a structure for attaching the light guide member 4 to the case 7. 4A is an enlarged cross-sectional view of the inside of the frame B in FIG. 2, and FIGS.

  The light guide member 4 is formed of, for example, a transparent synthetic resin such as an acrylic resin, and is arranged on the back side of the display board 2 and inserted through the pointer shaft 51 as shown in an enlarged view in FIG. A cylindrical portion 41, a bent portion 42 extending from the outer peripheral surface of the cylindrical portion 41 toward the outer edge of the display plate 2, and a locked portion 43 extending downward from the lower edge of the bent portion 42. Function as.

  The cylindrical portion 41 faces the light source 3 with the lower end surface 41 a facing the upper surface 41 b against the back surface of the display plate 2 positioned at the periphery of the through hole 22. The cylindrical portion 41 emits incident light from the lower end surface 41a from the upper end surface 41b, and illuminates the pointer 52 that faces the upper end surface 41b via the display panel 2.

  As shown in an enlarged view in FIG. 3, the bent portion 42 has a cross-sectional shape that extends upward from the lower end and then bends outward while widening, and has a distal end portion extending outwardly. An annular shape is formed around the portion 41. The bent portion 42 has a lower end surface arranged side by side with the lower end surface 41a of the cylindrical portion 41 as a light receiving surface 42a for the irradiation light from the light source 3, and a distal end surface facing outward is a light output of incident light from the light receiving surface 42a. The surface 42c is used.

  As shown in an enlarged view in FIG. 4A, the light receiving surface 42a is formed of a flat surface that is inclined with respect to the lower end surface 41a and faces the light source 3, and is indicated by a solid line arrow in FIG. In this way, incident light is refracted and guided to the internal reflection surface 42b. 4B, the upper inner surface of the bent portion of the bent portion 42 located above the light receiving surface 42a reflects incident light from the light receiving surface 42a as indicated by a dotted line in the figure. Thus, the inner reflection surface 42b is guided to the light exit surface 42c through the bent portion 42. As shown in an enlarged view in FIG. 4 (c), the internal reflection surface 42b has an incident angle of light incident from the light receiving surface 42a as indicated by a dotted line in FIG. It has a cross-sectional shape with an angle of. The light exit surface 42c has a cross-sectional shape that refracts the reflected light from the internal reflection surface 42b toward the reflection plate 6 as indicated by a dotted arrow in the drawing.

  As shown in FIG. 3, the locked portion 43 has a substantially L-shaped cross-sectional shape that extends downward from the lower edge of the bent portion 42 and then bends outward. A supported portion 42 d supported by the support portion 71 is provided at the lower edge of the bent portion 42 where the locked portion 43 extends. The light guide member 4 has a supported portion 42d mounted on an end portion 71b that extends upward inside the support portion 71, and the distal end of the locked portion 43 is locked by a flange portion 71a of the outer end portion. , Supported by the support portion 71.

  As shown in FIG. 1B, a part of the light emitted from the light source 3 is incident on the cylindrical portion 41 from the lower end surface 41a and is displayed from the upper end surface 41b as indicated by a dotted arrow in the figure. 2 irradiates the proximal end of the pointer 52 to illuminate the pointer 52. A part of the light emitted from the light source 3 is incident on the bent portion 42 from the light receiving surface 42a and reflected by the internal reflecting surface 42b as shown by a dotted arrow in FIG. The reflective plate 6 is irradiated from 42c and reflected by the reflective plate 6 to illuminate the indicator 21 from the back side.

  According to the present embodiment, the incident light to the light receiving surface 42a of the bent portion 42 arranged side by side with the lower end surface 41a of the cylindrical portion 41 is reflected by the internal reflecting surface 42b and emitted from the light emitting surface 42c. 6, the indicator 21 is illuminated on the back surface of the indicator 21, so that the illumination of the pointer 52 in the cylindrical portion 41 and the illumination of the indicator 21 in the bent portion 42 can be performed using one light source 3.

  Further, the incident light from the light receiving surface 42a reaches the light emitting surface 42c by one reflection at the internal reflection surface 42b, so that the irradiation light from the light source 3 can be guided to the reflection plate 6 without weakening.

  Further, by tilting the light receiving surface 42a with respect to the lower end surface 41a and facing the light source 3, strong light emitted above the light source 3 can be bent and guided to the internal reflection surface 42b. For this reason, light of sufficient intensity can be emitted from the light guide member 4.

  For example, as shown by a dotted line in FIG. 4A, in the light receiving surface 420a that is formed flush with the lower end surface 41a of the cylindrical portion 41 and does not face the light source 3, the light receiving surface 42a is located away from the light source 3. The incident angle becomes larger than the critical angle and the light is totally reflected. In addition, in the concave light receiving surface 421a shown in FIG. 5A, the incident light to the light receiving surface 421a spreads in the bent portion 42 and reaches the internal reflecting surface 42b while being reflected in the bent portion 42. The light irradiated from the light guide member 4 is weakened. In addition, in the convex light receiving surface 422a shown in FIG. 5B, incident light at both ends of the light receiving surface 422a is reflected, and light emitted from the light guide member 4 is weakened.

  On the other hand, according to the light receiving surface 42a which is arranged facing the light source 3 and is formed flat, the incident angle of incident light is kept smaller than the critical angle over the entire surface of the light receiving surface 42a, and more light is obtained. The light guide member 4 can irradiate light with sufficient intensity.

  Further, since the internal reflection surface 42b of the bent portion 42 is formed by the upper inner surface of the bent portion of the bent portion 42 and has a curved surface shape, incident light from the light receiving surface 42a is shown in FIG. As indicated by the dotted line, the light is reflected in the direction of the light exit surface 42c. For this reason, the incident light from the light receiving surface 42a can be guided to a narrow range, and the light guide member 4 can be downsized.

  Further, by changing the height of the end portion 71 b of the support portion 71, the height of the emitted light from the light exit surface 42 c is adjusted without changing the shape of the light guide member 4, and the reflection plate 6 is interposed. The illumination position of the index 21 can be adjusted. For this reason, the illumination according to the formation position and shape of the parameter | index 21 with which the display board 2 is provided can be performed easily.

  In the above embodiment, the case where the incident light from the light receiving surface 42a is reflected once by the internal reflection surface 42b and guided to the light exit surface 42c has been described. The smaller the number of reflections of the incident light from the light receiving surface 42a in the bent portion 42, the less the emitted light from the light emitting surface 42c does not weaken. Therefore, the number of the internal reflecting surfaces 42b is preferably small. The quantity of 42b can be suitably changed according to the installation place of the light guide member 4, etc.

  Moreover, in the said embodiment, the case where the bending part 42 was formed over the perimeter of the cylinder part 41, and exhibited the cyclic | annular form was demonstrated. However, if the indicator 21 can be illuminated via the reflector 6, the bent portion 42 does not need to be formed over the entire circumference of the cylindrical portion 41. For example, the bent portion is provided for each one or a plurality of indicators 21. 42 may be provided.

It is a figure which shows the outline of a structure of the display apparatus of one Embodiment of this invention, (a) is a top view, (b) is sectional drawing. It is sectional drawing which expands and shows the light guide member of a display apparatus. It is a figure which shows the attachment structure to the case of a light guide member. (A) is the light-receiving surface of a light guide member, (b) is an internal reflective surface, (c) is sectional drawing which expands and shows a light-emitting surface. It is a figure which shows the relationship between the cross-sectional shape of a light-receiving surface, and the direction where incident light is guide | induced.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Display apparatus 2 Display board 21 Index 22 Through-hole 3 Light source 4 Light guide member 41 Cylindrical part 41a Lower end surface 41b Upper end surface 42 Bending part 42a Light-receiving surface 42b Internal reflection surface 42c Outgoing surface 42d Supported part 43 Locked part 5 Pointer Member 51 Pointer shaft 52 Pointer 6 Reflecting plate 7 Case 71 Mounting portion 71a Gutter

Claims (2)

A display plate having a design portion and having translucency; a pointer member for rotating a pointer along the surface of the display plate around a rotation axis penetrating the display plate from the front surface side to the back surface side; A light source disposed around the rotation axis toward the back surface of the display plate, a light guide member for guiding irradiation light from the light source to the pointer and the design portion, and disposed on the back surface side of the design portion A reflection plate that reflects the emitted light from the light guide member to the back surface of the design portion,
The light guide member is disposed on the back surface side of the display plate, is inserted through the rotation shaft, and emits incident light from one end face facing the light source from the other end face facing the pointer, and
Extending on the outer peripheral surface of the cylindrical portion from the light receiving surface arranged side by side with the one end surface toward the display plate side, and then bending and extending to the outer edge side of the display plate. A display device comprising: a bent portion that emits light toward the reflection plate from a light exit surface facing the outer edge side of the display plate. The bent portion is arranged to be inclined with respect to the one end surface, and the flat light-receiving surface facing the light source;
It comprises a bent surface that is bent from the outer peripheral surface side of the cylindrical portion toward the outer edge side of the display plate, and includes an internal reflection surface that reflects incident light from the light receiving surface and guides it to the light output surface. The display device according to claim 1.

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