JPH0590553U - Switch lighting structure - Google Patents

Abstract

(57) [Abstract] [Purpose] The upper surface of the light guide is printed with halftone dots to make the illuminance of the entire nameplate uniform. [Structure] The knob 2 and the name plate 3 are arranged on the case 1. At the bottom of the nameplate 3, a light guide 4 for guiding the light of the lamp 5 to the nameplate 3 is installed. Halftone printing is applied to the upper surface of the light guide 4 to make the illuminance of light uniform. As a result, the entire surface of the nameplate 3 is illuminated and displayed with a uniform illuminance.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a switch illumination structure for illuminating a switch nameplate.

[0002]

[Prior Art]

 Conventionally, as a technique of this type, for example, there is a display device disclosed in Japanese Utility Model Laid-Open No. 52-116183. In this display device, in order to illuminate the entire nameplate with a lamp with a uniform illuminance, a large number of recesses for reflecting the light of the lamp are formed on the lower surface of the light guide. In addition, the light guide forms a V-shaped reflecting surface or the like above the lamp where the light of the lamp is diffused.

[0003]

[Problems to be solved by the device]

 In the above-mentioned display device, in order to illuminate the nameplate with a uniform illuminance, it is difficult to set the shape and arrangement of the reflecting surface of the light guide and the recess, and the position of the lamp.

[0004]

[Means for Solving the Problems]

 The switch lighting structure according to the present invention comprises a knob arranged in parallel with the switch case, a nameplate arranged near the knob, and a nameplate indicating the function of the knob, a nameplate arranged on the lower surface of the nameplate, and a lamp. In a lighting structure of a switch including a light conductor for guiding the light of the nameplate to the nameplate and the lamp for illuminating the nameplate, halftone dot printing for adjusting the illuminance of light is provided on at least one of the light conductor and the nameplate. By applying the method, the whole nameplate is illuminated with uniform illuminance by a simple and inexpensive means.

[0005]

【Example】

 Hereinafter, a preferred embodiment of a switch illumination structure according to the present invention will be described in detail with reference to FIGS. 1, 2, 3 and 4.

Reference numeral 1 denotes a case such as a switch or a display device, on which a plurality of knobs 2 and a name plate 3 are arranged. The knob 2 is an operator such as a push button switch or a slide switch. The nameplate 3 is made of a transparent body or a semitransparent body, and is provided with letters or a mark indicating the function of the knob 2 and is installed near the knob 2.

Reference numeral 4 denotes an optical conductor that guides the light of the lamp 5 to the entire nameplate 3, and is arranged on the lower surface of the nameplate 3. The light guide 4 is made of a transparent material, and has a light receiving surface 4a into which the lamp 5 is inserted at the center of the lower surface. The light receiving surface 4a is formed in a substantially hemispherical shape in order to diffuse the light of the lamp 5. Reference numeral 4 b is a protrusion for fixing the light guide 4, and is fitted into the substrate 7 via the rubber contact 6. Reference numeral 4c is a reflecting surface for reflecting the light of the lamp 5 on the name plate 3. The light guide 4 is provided on its upper surface with particulate dot printing for adjusting the illuminance of the lamp 5. The paint used for halftone printing has the same color as the lamp filter 8. In halftone printing, as shown in FIG. 3, the light portion A of the light guide 4 near the lamp 5 is densely printed, the light portion B is roughly printed, and the other dark portion C is printed. I don't. In this way, the light guide 4 is printed according to the density of halftone dots printed by the halftone dot printing to match the illuminance of the light emitted from the light guide 4, and the illuminance of the light emitted from the upper surface of the light guide 4 is made uniform. ing.

The lamp 5 is, for example, an incandescent light bulb for night illumination, and is covered with a lamp filter 8. The lamp 5 is mounted on a lamp holder 9 which is attached to a substrate 7. The rubber contact 6 has a movable contact (not shown) below the knob 2 and is mounted on the substrate 7. The substrate 7 is made of, for example, a printed circuit board and has fixed contacts (not shown) printed thereon. Reference numeral 10 denotes a lower lid fitted to the open end of the case 1.

The illumination structure of the switch according to the present invention is the above-mentioned structure, and its operation will be described in detail below. When the lamp 5 is turned on, the light of the lamp 5 enters the light guide 4 from the light receiving surface 4a and diffuses. The light of the lamp 5 is reflected upward by the reflecting surface 4c and emitted from the upper surface of the light guide 4 to illuminate the nameplate 3. The light guide 4 is provided on the upper surface thereof with halftone dot printing in which the density of halftone dots is adjusted according to the illuminance of emitted light. As a result, the illuminance of light emitted from the entire upper surface of the light guide 4 becomes uniform, and the entire surface of the nameplate 3 is illuminated and displayed with uniform brightness.

The present invention has described in detail that the light guide 4 as described above is subjected to halftone dot printing for dimming light. However, halftone dot printing is performed on the lower surface or the upper surface of the nameplate 3. Needless to say, the same action and effect can be obtained even by applying.

[0011]

[Effect of the device]

 In the lighting structure of the switch according to the present invention, the light guide or the nameplate is subjected to dot printing for adjusting the illuminance of light, so that the shape of the light guide can be simplified and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a plan view showing an embodiment of the light guide of the present invention.

FIG. 4 is a front view showing an embodiment of the light guide of the present invention.

[Explanation of symbols]

 1 Case 2 Knob 3 Nameplate 4 Light guide 5 Lamp

Claims (1)

[Scope of utility model registration request] 1. A knob arranged side by side in a switch case, a name plate arranged near the knob and indicating a function of the knob, and a lower surface of the name plate, and a lamp light for the name plate. In a lighting structure of a switch including a light guide that guides to a light and a lamp that illuminates the nameplate, at least one of the light conductor and the nameplate is subjected to dot printing, and the switch lighting is characterized. Construction.