JPH076485Y2 - Lighting device for instrument pointer - Google Patents

Description

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

[Prior Art] FIG. 3 shows the shape of a pointer of a commonly used analog type meter, and the pointer 1 is illuminated by an illuminating means installed in the meter. . The light emitting display structure of the pointer 1 is as shown in FIG. 4, 2 is made of a transparent or semi-transparent material capable of guiding light, and further on a pointer shaft (not shown) expended from the movement. From the base 3 to be inserted and the upper end of the base 3, T
A pointer main body composed of a pointer portion 4 extending in the letter direction, and a hollow reflecting portion 5 having a substantially inverted trapezoidal shape is formed at a position where the pointer portion 4 approaches the base portion 3. . A modified T-shaped semi-transparent light diffusing member 6 is fitted in the hollow reflecting portion 5, and the front of the pointer main body 2 with the base portion 3 as a boundary extends to the indicating portion 2 '. The rear part is formed as a balance part 2 ″. In the illuminating means of the pointer main body 2, the light incident on the light guide 8 arranged on the back side of the dial 7 is reflected by the reflecting surface 8 ′. It is reflected and the pointer body 2
Light is incident on the inside, and a part of the light is reflected by the inclined reflecting surface 5'of the hollow reflecting portion 5 and the reflecting surface 4'of the pointer portion 4 so that the surface of the pointer main body is illuminated and displayed. Has become. Reference numeral 9 indicates a light-transmitting colored layer provided on the surface of the pointer main body 2, and 10 indicates a light source.

[Problems to be Solved by the Invention] However, in such a conventional pointer illuminating device, the light is reflected by both inclined reflecting surfaces 5 ', 5'of the hollow reflecting portion 5 having a substantially inverted trapezoidal shape. The surface of the pointer body 2 is caused to emit light by the reflected light in the direction of the pointer axis.
Since the pointer balance portion 2 ″ is shorter than the pointer portion 2 ′ bordering the hollow reflection portion 5 (base portion 3), as shown in FIG. There is a problem that the emission brightness is increased and the emission brightness on the surface of the pointer 1 becomes uneven.

[Means for Solving the Problems] The present invention has been made in view of such a problem, and particularly, a control surface for limiting transmitted light is formed in an optical path that emits a balance portion (rear end portion) 2 ″ of a pointer. Thus, the light emission brightness can be made uniform over the entire surface of the pointer. Provided is a lighting device for a meter pointer, which is capable of making the brightness of the entire pointer surface uniform by forming, for example, a satin-shaped or semi-transparent transmitted light control surface for controlling the incident light on the light incident surface. Especially.

[Embodiment] The present invention will be described below based on an embodiment shown in FIG. 1 and FIG. 2. The same parts of the structure of this embodiment and the structure described in the conventional example are the same as those in the conventional example. The same reference numerals are used and the description of the same structural parts is omitted.

In FIG. 1, the feature of this embodiment is that the inclined reflecting surface 5 ′ located on the balance portion 2 ″ side of the inverted trapezoidal hollow reflecting portion 5 formed near the base portion 3 of the pointer portion 4 has a satin finish. The incident light control surface 12 is formed, and the incident light control surface 12 is not limited to satin, and may be, for example, a semitransparent paint layer.

Therefore, according to this embodiment, a part of the light to be guided from the light guide 8 to the balance portion 2 ″ of the pointer 1 is formed on the reflecting surface 5 ′ of the hollow reflecting portion 5 as the incident light control surface. Since the amount of light reflected (absorbed) by 12 and reaching the surface of the pointer balance portion 2 ″ is dimmed, this dimming makes the light emission luminance of the entire surface of the pointer 1 uniform.

FIG. 2 shows another embodiment of the present invention. In this embodiment, the reflecting surface 4'formed on the back surface of the balance portion 2 "of the pointer 1 has the same satin-like shape as the above embodiment. Even if the incident light control surface 12 is formed and this embodiment is used, it is possible to achieve the same uniformity of the pointer emission brightness as that of the above embodiment.

[Advantage of the Invention] As described above, the present invention is a technique for illuminating the pointer itself by guiding light into the pointer of the measuring instrument, which is made of a translucent material and extends forward and backward from the center of rotation of the pointer. A pointer portion 4 having a 2'and a balance portion 2 ", a translucent colored portion 9 provided on the upper surface of the pointer portion 4, and a light receiving portion from the axial direction of the pointer provided near the rotation center of the pointer portion 4. First reflecting surfaces 5 ', 5'for reflecting the illumination light forward and backward inside the pointer main body, and the light reflected rearward of the pointer further toward the translucent colored portion 9. In the pointer having the second reflecting surface 4'which reflects, the first reflecting surface 5'guided to the balance portion 2 "or the light reflected by the first reflecting surface is transmitted through the balance portion surface. At least one of the second reflecting surfaces 4'which is reflected toward the colored portion 9 According to this illuminating device for instrument pointers, the reflecting surface is formed on the irregular reflection surface 12 that regulates the amount of reflected light. Therefore, according to this, a part of the amount of light incident on the balance portion 2 ″ of the pointer is a control surface 12 for incident light. Is controlled (suppressed), the amount of light reaching the surface of the pointer balance portion 2 ″ is dimmed, and this dimming has the effect of making the emission brightness of the entire surface of the pointer 1 uniform. can get.

[Brief description of drawings]

FIG. 1 is a sectional explanatory view showing an embodiment of a pointer illuminating device according to the present invention, FIG. 2 is a sectional explanatory view showing another embodiment, FIG. 3 is an overall perspective view of the pointer, and FIG. FIG. 5 is an explanatory sectional view of an example, and FIG. 12 …… Incoming light control surface.

Claims (1)

[Scope of utility model registration request] 1. A technique for illuminating the pointer itself by guiding light into the pointer of a measuring instrument, which is made of a translucent material and extends forward and backward from the center of rotation of the pointer, and a balance portion (2). Pointer portion (4) having 2 ″) and the pointer portion (4)
The translucent colored portion (9) provided on the upper surface of the needle and the illumination light received near the center of rotation of the pointer portion (4) and received from the pointer axis direction are reflected forward and backward inside the pointer main body. The first reflecting surfaces (5 '), (5') for making the second reflecting surface (5 ') and the second reflecting surface (5') for reflecting the light reflected toward the rear of the pointer further toward the transparent colored portion (9) ( 4 ′), the first reflecting surface (5 ′) that guides light only to the balance portion (2 ″) or the light reflected by the first reflecting surface transmits light to the surface of the balance portion. At least one of the second reflecting surfaces (4 ') that reflects the light toward the colored portion (9) has a diffuse reflection surface (1) that regulates the amount of reflected light.
A lighting device for instrument pointers characterized by being formed in 2).