JPH09222340A - Indicating instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an indicating instrument that causes the indexing part of a needle to glitter in white with a high brightness and can be manufactured inexpensively. SOLUTION: A measuring instrument body 1 has a needle shaft 2 that is provided so that it can rotate. A needle 3 is fixed to the needle shaft 2 and introduces light from a light reception surface 4 (light reception part) and causes an indexing part 6 to glitter. A dial 7 is indicated by the indexing part 6. A wiring plate 9 is provided at the rear of the dial 7, a through hole 10 where the needle shaft 2 passes is formed, and red light-emitting diode 11, a green light-emitting diode 12, and a blue light-emitting diode are provided around the through hole 10. A first light-guiding body 17 mixes the light of the light- emitting diodes 11, 12... and guides it to the light reception surface 4 of the needle 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indicating instrument, and more particularly to an indicating instrument provided with a pointer capable of shining an index portion.

[0002]

2. Description of the Related Art Heretofore, various indicator instruments have been proposed which can illuminate the indicator portion of a pointer. For example, an indicator instrument disclosed in Japanese Utility Model Laid-Open No. 5-33023 discloses an indicator unit for indicating a dial by introducing light from a light emitting diode from a light receiving unit into a pointer fixed to a pointer shaft that rotates according to a measurement amount. The light source substrate on which the light emitting diode is arranged is provided on the rear surface side of the dial.

[0003]

The above-mentioned indicating instrument has the advantage that it can illuminate the indicator portion with high brightness, but a light emitting diode that emits white light has not yet been realized.
There is a problem that the index portion cannot be made to shine white. In response to such a problem, an indicator instrument in which a rod-shaped discharge tube (cold cathode tube or the like) is attached to the indicator portion of the pointer has been proposed, and is disclosed in, for example, Japanese Patent Publication No. 7-104184. However, since the discharge tube must be rotatably attached and electric power must be supplied to the discharge tube, the wiring becomes complicated, so that the number of man-hours for assembling the pointer is large and the indicating instrument is expensive. . The present invention provides an indicator instrument capable of brightly illuminating the indicator portion of the pointer with high brightness in white and inexpensively manufactured.

[0004]

In order to solve the above problems, the present invention provides an instrument main body having a pointer shaft rotatably provided and a light receiving portion fixed to the pointer shaft to introduce light from the light receiving portion to illuminate the indicator portion. And a dial that is pointed by the indicator,
A wiring board provided behind the dial and having a through hole through which the pointer shaft penetrates, and a light emitting diode for irradiating red, green and blue light around the through hole is provided; A first light guide that mixes light and guides it to the light receiving unit.

Further, the present invention has a light source for illuminating the dial from the rear and a second light guide for guiding the light of the light source to the light receiving portion.

Further, according to the present invention, the first light guide has a bearing portion for bearing the pointer shaft.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A pointer 3 fixed to a pointer shaft 2 of an instrument main body 1 rotates, and an index portion 6 of the pointer 3 points a dial plate 7. A wiring board 9 is provided behind the dial 7, a through hole 10 through which the pointer shaft 2 penetrates is formed in the wiring board 9, and a red light emitting diode 11, a green light emitting diode 12 and a blue light emitting diode are provided around the through hole 10. 13 and 14 are arranged, and a first light guide 17 for guiding the light of each light emitting diode 11, 12, 13, 14 to the light receiving portion 4 of the pointer 3 is provided. The lights of the respective light emitting diodes 11, 12, 13, 14 for irradiating the red, green and blue lights are mixed while being diffusely reflected in the first light guide body 17 and introduced from the light receiving part 4 and the indicator part 6 of the pointer 3. Can be made to shine substantially white with high brightness.

A light source 24 for illuminating the dial 7 from the rear side.
By providing the second light guide 25 which guides the light of the light source 24 to the light receiving portion 4 of the pointer 3, the indicator portion 6 of the pointer 3 can be made to shine with higher brightness.

Further, if the first light guide 17 is provided with the bearing portion 20 for bearing the pointer shaft 2 of the instrument body 1, there is no fear that the pointer shaft 2 becomes unstable.

[0010]

An embodiment of the present invention will be described below with reference to the accompanying drawings. 1 and 2 are views showing a first embodiment.

Reference numeral 1 is an instrument main body. The instrument body 1 is a so-called movable magnet type movement, and the pointer shaft 2 rotates in accordance with the rotation of a movable magnet (not shown) provided inside. Reference numeral 3 is a pointer, and the pointer 3 is fixed to the pointer shaft 2. The pointer 3 introduces light from the light receiving surface 4 (light receiving portion) and reflects it in the direction of the index portion 6 by the reflecting surface 5 to make the index portion 6 shine. Reference numeral 7 is a dial, and this dial 7 is designated by the index portion 6 of the pointer 3. A through hole 8 through which the pointer shaft 2 penetrates is formed in the dial plate 7. Reference numeral 9 is a wiring board, and the wiring board 9 is provided behind the dial 7. The wiring board 9 is formed with a through hole 10 through which the pointer shaft 2 passes.
Red LED 11 and green LED around
12 and blue light emitting diodes 13 and 14 are provided (see FIG. 2). A spacer 15 is provided between the dial 7 and the wiring board 9, and the dial 7 and the wiring board 9 are fixed to the instrument body 1 with screws 16.

Reference numeral 17 is a first light guide, and the first light guide 17 is bonded to the wiring board 9. The first light guide 17 has a conical side surface 18 and a light emitting surface 19 facing the light receiving surface 4 of the pointer 3, and the light emitting surface 19 is a satin surface (fine uneven surface). Further, the first light guide 17 is a bearing portion for bearing the pointer shaft 2.
20 are formed. The first light guide 17 is a red light emitting diode 11, a green light emitting diode 12 and a blue light emitting diode.
The light of 13 and 14 is mixed and guided to the light receiving surface 4 of the pointer 3.

Reference numeral 21 is a circuit board. The circuit board 21 is fixed to the instrument main body 1 by screws 22 and is connected to the instrument main body 1 to supply necessary electric power. Reference numeral 23 is a lead pin. One end of the lead pin 23 is soldered to the wiring board 9 and the other end is soldered to the circuit board 21, and the lead pin 23 connects the wiring board 9 and the circuit board 21.

The light emitted from the red light emitting diode 11, the green light emitting diode 12 and the blue light emitting diodes 13 and 14 is the first light guide.
The light is diffusely reflected in the inside of 17 and mixed to become substantially white light, which is emitted from the light emitting surface 19 toward the light receiving surface 4 of the pointer 3. The light introduced from the light receiving surface 4 of the pointer 3 is reflected in the direction of the index portion 6 by the reflecting surface 5, and the index portion 5 can be made to shine substantially white.

FIG. 3 is a partial sectional view showing the second embodiment. The same parts as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

A pointer 3 fixed to a pointer shaft 2 of the instrument body 1.
Is rotated, and the index portion 6 of the pointer 3 points the dial 7. The wiring board 9 has a red light emitting diode 11 and a green light emitting diode.
12 and blue light emitting diodes 13 and 14 are provided, and the light of each light emitting diode 11, 12, 13, and 14 is guided to the light receiving surface 4 of the pointer 3 by the first light guide 17.

Reference numeral 24 denotes a cold cathode tube (light source). The cold cathode tube 24 has an annular shape and is provided around the instrument main body 1 to emit substantially white light and illuminate the dial 7 from behind. The second light guide 25 is provided on the rear surface of the dial 7. The second light guide 25 has a light-receiving surface 26 for receiving the light of the cold cathode tube 24 and a reflecting surface 27 for reflecting the light on the light-receiving surface 4 of the pointer 3, and the light of the cold cathode tube 24 is used as a pointer. Three
Can be guided to the light receiving surface 4. 28 is a fixing member,
The dial 29 with the second light guide 25 on the support piece 30 by the screw 29
Are fixed, and the wiring board 9 is fixed to the mounting surface 32 with screws 31.

According to the first and second embodiments described above, the light of each of the light emitting diodes 11, 12, 13, 14 is guided to the light receiving surface 4 of the pointer 3 by the first light guide member 17, and Indicator part 3 of 3
Can shine. The first light guide 17 can collect and mix the lights of the respective light emitting diodes 11, 12, 13, 14 and can make the index portion 6 shine with a high brightness and substantially white. Further, it is not necessary to attach a light source for shining the indicator portion 6 of the pointer 3 to the indicator portion 6, and the indicating instrument can be manufactured at low cost.

Although it is conceivable that the pointer shaft 2 of the instrument main body 1 is slightly long, the pointer shaft 2 is unstable by providing the first light guide 17 with the bearing portion 20 for bearing the pointer shaft 2. There is no fear of becoming.

Further, as shown in the second embodiment, a cold cathode tube 24 for illuminating the dial 7 is provided, and a second light guide for guiding the light of the cold cathode tube 24 to the light receiving surface 4 of the pointer 3. When 25 is provided, the index portion 6 can be made to shine with higher brightness.

In the first and second embodiments, two blue diodes 13 and 14 are provided, but at least one red light emitting diode 11, green light emitting diode 12 and blue light emitting diodes 13 and 14 are provided. It suffices to dispose them one by one, and the number of the light emitting diodes 11, 12, 13, 14 can be appropriately set, and the hue of the indicator portion 6 can be adjusted to substantially white.

In the first and second embodiments, the red light emitting diode 11, the green light emitting diode 12 and the blue light emitting diodes 13 and 14 are used, but a color filter or the like is attached to the light emitting diode element. Then, red, green, and blue light may be emitted.

In the second embodiment, the cold cathode tube 24 (light source) for illuminating the dial 7 is provided, but the light source for illuminating the dial 7 may be a hot cathode tube, a bulb or the like. .

[0024]

According to the present invention, the instrument main body is provided with the pointer shaft rotatably, the pointer fixed to the pointer shaft to guide the light from the light receiving portion to make the index portion shine, and the pointer is instructed. A dial, a wiring board provided behind the dial and having a through hole through which the pointer shaft penetrates, and a red, green and blue light emitting diode arranged around the through hole; A first light guide that mixes light and guides the light to the light receiving unit, and mixes light of light emitting diodes that emit red, green, and blue light by the first light guide to receive a pointer. The index portion of the pointer can be made to shine with a high brightness and substantially white.

Further, the present invention comprises a light source for illuminating the dial from the rear, and a second light guide body for guiding the light of the light source to the light receiving portion. The index portion can be made to shine.

Since the first light guide has a bearing portion for bearing the pointer shaft, there is no fear that the pointer shaft becomes unstable.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing a first embodiment of the present invention.

FIG. 2 is a perspective view of a first light guide and a wiring board showing the embodiment.

FIG. 3 is a partial sectional view showing a second embodiment of the present invention.

[Explanation of symbols]

 1 Instrument main body 2 Pointer shaft 3 Pointer 4 Light receiving surface (light receiving part) 6 Index part 7 Dial 9 Wiring board 10 Through hole 11 Red light emitting diode 12 Green light emitting diode 13, 14 Blue light emitting diode 17 First light guide 20 Bearing Part 24 Cold cathode tube (light source) 25 Second light guide

Claims (3)

[Claims] 1. An instrument main body having a pointer shaft rotatably provided,
A pointer fixed to the pointer shaft to guide light from the light receiving portion to shine the indicator portion, a dial pointed by the indicator portion, and a through hole provided behind the dial plate and through which the pointer shaft penetrates are formed. A wiring board provided with a light emitting diode for irradiating red, green and blue light around the through hole, and a first light guide body for mixing the light of the light emitting diode and guiding the mixed light to the light receiving portion. An indicating instrument characterized by having. 2. A light source for illuminating the dial from the rear,
The indicating instrument according to claim 1, further comprising a second light guide body that guides the light from the light source to the light receiving unit. 3. The indicating instrument according to claim 1, wherein the first light guide has a bearing portion for bearing the pointer shaft.