JPH067310Y2 - Lighting device for instrument pointer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a pointer illumination device for an analog meter.

[Prior Art] As a conventional instrument pointer illuminating device of this type, there is one having a structure as shown in FIG. This pointer structure is made of a transparent or semi-transparent material that can guide light, and its shape is a pointer shaft (not shown) that is expended from the movement.
And a pointer portion 2 extending in the T-direction from the upper end of the base portion 1, and at the position of the pointer portion 2 approaching the base portion 1, a hollow reflector having an inverted trapezoidal shape. 3 is formed, and a semi-transparent light diffusing member 4 having a substantially T shape is fitted in the hollow reflecting portion 3.
Further, in the illuminating means of the pointer portion 2, if the light entering the light guide plate 6 arranged on the back side of the dial plate 5 is reflected by the reflecting surface 6'and enters the pointer portion 2, A part of the incident light is reflected by the inclined reflecting surface 3a of the hollow reflecting portion 3 and the end reflecting surface 2'of the pointer portion 2, so that the surface of the pointer portion 2 is illuminated and displayed. Reference numeral 7 denotes a translucent colored layer provided on the surface of the pointer portion 2, and 8 denotes a light source. In the pointer illumination structure having such a shape, part of the light introduced into the pointer portion 2 via the light guide plate 6 is, as described above,
The other part of the light reflected by the inclined reflection surface 3a and guided in the axial direction of the pointer portion 2 is used for illumination in the direction of the tip of the pointer portion 2, and the other portion of the light introduced from the light guide plate 6 to the pointer portion 2 is The hollow reflecting portion 3 and the semi-translucent light diffusing member 4 are passed through to illuminate the base portion 1 of the pointer portion 2, and the entire surface of the pointer portion 2 (the entire length of the pointer) is substantially uniformly illuminated and displayed. It is configured with the wish.

[Problems to be Solved by the Invention] However, in such a conventional pointer illuminating device, the reflected light on the inclined reflecting surface 3a in the vicinity of the acute angle portion 3'of the hollow reflecting portion 3 having an inverted trapezoidal shape is Since the reflected light in the axial direction of the pointer portion 2 is strong and the reflected light passing through the semi-translucent light diffusing member 4 is reduced, the luminous intensity of the upper surface of the pointer above the acute angle portion 3'is weak. Therefore, there is a problem in that the illuminance on the upper surface of the pointer is uneven.

[Means for Solving the Problems] The present invention has been made in view of such a problem. An acute angle portion of an inverted trapezoidal hollow reflecting portion formed on a pointer base is parallel to the inverted trapezoidal horizontal portion. An object of the present invention is to provide an improved illuminating device for instrument pointers, in which a light transmitting surface is formed so that the entire upper surface of the pointer portion can be uniformly illuminated and displayed.

[Embodiment] The present invention will be described below based on the embodiment shown in FIG. 1. The same parts of the structure of this embodiment and the structure described in the conventional example are the same as those used in the conventional example. The description of the same structural parts will be omitted.

That is, the feature of this embodiment is that the light-transmitting surface 3c parallel to the inverted trapezoidal horizontal portion is formed at the acute angle portion of the inverted trapezoidal hollow reflecting portion formed on the base of the pointer. More specifically, in this embodiment, in the inclined surface 3a of the inverted trapezoidal hollow reflection portion 3, a light transmission surface 3c parallel to the inverted trapezoidal horizontal portion 3b is provided in the vicinity of the acute angle portion from the inverted trapezoid to the outside. The light-transmitting surface 3c is formed so as to project in a direction in which the light-transmitting surface 3c is projected to a vertical line from the tip of the horizontal portion of the T-shaped light diffusing member 4.

As described above, in the instrument pointer according to the present embodiment, light is emitted to the acute angle portion 3 ′ of the hollow reflecting portion 3 formed in an inverted trapezoidal shape, that is, the position corresponding to the horizontal tip of the T-type light diffusing member 4. Since the transparent surface 3c is formed, the distance from the radiation surface of the light guide plate 6 is long and the amount of light guided by the light guide plate 6 is relatively weak. Since the light is transmitted through the light diffusing member 4 to the upper surface of the pointer portion without being attenuated by the surface, the entire upper surface (front surface) of the pointer portion is illuminated and displayed with a substantially uniform light amount.

[Effects of the Invention] As described above, the present invention is a pointer that guides light into the pointer of the instrument to illuminate the pointer itself, and is made of a translucent material, and is an indicator that extends forward and backward from the center of rotation of the pointer. And a pointer portion 2 having a balance portion, a translucent colored portion 7 provided on the upper surface of the pointer portion 2, and an illumination light received near the center of rotation of the pointer portion 2 and received from the pointer axis direction. Inclined reflective surface 3a that reflects forward and backward inside the pointer body
And a hollow reflecting portion 3 having a flat surface 3b parallel to the upper surface of the pointer portion, and a semitransparent light diffusing member 4 fitted in the hollow reflecting portion 3, the tilted reflecting surface 3a
Near the plane 3b of the light transmitting surface 3 parallel to the plane 3b.
Since it is an instrument pointer illuminating device in which c is formed, according to this, the light guide plate 6 has a long distance due to the configuration of the light transmitting surface 3, and the light guided by the light guide plate 6 is used. Since the amount of light received by the light is relatively weak and is not attenuated by the light transmitting surface and is transmitted through the light diffusing member 4 to the upper surface of the pointer portion, the upper surface (front surface) of the pointer portion.
There is an effect that light emission is displayed with a substantially uniform light amount over the whole.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an essential part showing an embodiment of a pointer illuminating device according to the present invention, and FIG. 2 is a sectional view showing an essential part of a conventional pointer. DESCRIPTION OF SYMBOLS 1 ... Base part, 2 ... Pointer part 2 '... End surface, 3 ... Hollow reflective part 3' ... Acute angle part, 3a ... Inclined reflective surface 3b ... Horizontal surface, 3c ... Light transmissive surface 4 ... Semitranslucent light diffusing member, 4 '... convex curved surface 5 ... dial, 6 ... light guide plate 6' ... reflective surface, 7 ... colored layer 8 ... light source.

Claims (1)

[Scope of utility model registration request] 1. A pointer for guiding light into the pointer of a measuring instrument to illuminate the pointer itself, which is made of a translucent material, and has a pointer portion and a balance portion extending forward and backward from the center of rotation of the pointer. (2), a transparent colored portion (7) provided on the upper surface of the pointer portion (2), and illumination light received near the center of rotation of the pointer portion (2) and received from the pointer axis direction. A hollow reflector having an inclined reflecting surface (3a) for reflecting the inside of the pointer body forward and backward and a plane (3b) parallel to the upper surface of the pointer.
(3) and a semi-transparent light diffusing member (4) fitted in the hollow reflecting portion (3), the inclined reflecting surface (3
In the vicinity of the plane (3b) of a), a light transmitting surface parallel to the plane (3b)
(3c) is formed, the instrument pointer illuminating device.