JPS6216389B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to lighting for a timepiece having an analog display section and a digital display section.

[Conventional technology]

Generally, a liquid crystal display is used for the digital display section of a watch. Since the liquid crystal display is not self-luminous, the time digits are difficult to read or are not visible at all, especially at night in a dark place. For this reason, a lamp is attached to the digital display section to provide illumination.

On the other hand, the analog display is also difficult to see in dark places at night, so luminous paint is generally used for the hands for night illumination.

[Problem that the invention seeks to solve]

However, in the case of luminous paints, the amount of use thereof is limited for safety and hygiene reasons, making it impossible to obtain a sufficient appearance.

Therefore, we wondered if it would be possible to use lamps for the analog display section, and we worked hard to find a way to use the same lamp for lighting the digital display section.

The present invention has been made in view of this point of view, and it is an object of the present invention to provide an inexpensive illumination device with a simple structure and good appearance for both a digital display section and an analog display section.

[Means for solving problems]

In order to achieve the above object, the present invention arranges the pointer of the analog display section and the liquid crystal panel of the digital display section at approximately the same height in cross-section, and also provides lighting for the analog display section and the digital display section. The light guide plate is integrated with a cutout or hole for storing the illumination lamp, and the light guide plate for illumination arranged in the analog display part is formed with time scales, marks, etc. The light guide plate and the illumination lamp are arranged at substantially the same height in cross section.

[Effect]

With the above configuration, when it is dark at night, when you operate the button switch to turn on the lamp, the illumination light guide plate placed on the digital display illuminates the digital display, and at the same time, the illumination light guide plate placed on the analog display illuminates the digital display. The idea is to use a light plate to illuminate the analog display section as well.

〔Example〕

Examples will be described below with reference to the drawings.

FIG. 1 is a plan view of a timepiece having a pointer-type analog display section and a digital display section using a liquid crystal display.
An analog display section 1 and a digital display section 2 are arranged inside the watch case 3.
The normal time is displayed by the hour hand 5 and minute hand 6. The digital display part 2 still shows the hours by numbers.
Minutes and seconds are displayed, and in addition to the normal time, alarm time and chronograph display are also possible. On the outside of the watch case 3, external operating members such as a lighting button 21 and a reuse are arranged.

When looking at the clock at night, each display section 1, 2 at the bottom of the windshield 4 is illuminated by pressing an illumination button 21 provided on the clock case 3.

FIG. 2 is a partial cross-sectional view taken along arrow A-A in FIG. The circuit board 7 housed in the watch case 3 is equipped with electronic components such as a switch mechanism interlocked with the lighting button 21, a battery (not shown), and a watch IC chip 8. On the digital display side, a light guide plate 10A integrated with a reflection plate 9, a liquid crystal cell 11 integrated with a polarizing plate 12 are stacked, and a liquid crystal cell support frame 13 is stacked.
It is held and fixed by. On the other hand, in the analog display section, the rotation from the motor is transmitted via a gear train (not shown) to the second wheel 17 to which the minute hand 6 is fixed, and the rotation is transmitted to the hour hand 5 via the hour wheel (not shown).
The rotation is transmitted to the hour wheel 18 to which the hour wheel 18 is fixed, causing the hour and minute hands 5 and 6 to rotate. The hour wheel 18 and the second wheel 17 are the central pipe 1 installed on the main plate 14 which is fixed to the case.
5 is the axis of rotation. The pointer position of the analog display section is arranged at approximately the same height in cross section as the position of the liquid crystal panel of the digital display section. The dial of the analog display section is constituted by a light guide plate 10B integrated with a reflection plate 9.
A name mark 20 is formed as a time scale. Light guide plate 10 placed in the analog display section
A and a light guide plate 10 on which a digital display section is arranged.
B is formed integrally with the light guide plate 10 for illumination.

Since the light guide plate 10 is generally molded from resin, an integrated light guide plate has better work efficiency and is cheaper than a separate light guide plate for analog and digital use. Furthermore, by integrating the light guide plate, positioning of the light guide plate during assembly becomes easy, and assembly work efficiency is improved. An illumination lamp 19 is fixed to the circuit board 7 on the display section side, and the illumination lamp 19 is arranged approximately at the boundary area between the analog display section and the digital display section. The light guide plates 10A and 10B are disposed at approximately the same height as the illumination lamp 19 in cross section.

FIG. 3 is a plan view of the light guide plate 10 integrated with the reflection plate 9. Light guide plate section 10A for digital display section
A notch 10C into which an illumination lamp 19 is inserted is provided at the boundary between the light guide plate portion 10B for the analog display portion, and a time scale and a name mark 20 are provided on the analog display portion 10B.

In the clock configured as described above, when the illumination button 21 is pressed, the illumination lamp 19 located at approximately the same height as the light guide plates 10A and 10B lights up, and is installed at the boundary between the analog display section and the digital display section. Since the light from the lamp 19 transmitted through the light guide plate 10 uniformly illuminates both the entire analog display section 1 and the entire digital display section 2, a beautiful lighting effect can be obtained.

〔Effect of the invention〕

As explained above, according to the present invention, by arranging the liquid crystal panels of the pointers at approximately the same height, and by installing the lamps at the boundary between the analog display section and the digital display section, the display can be displayed with a small number of lamps. The entire area can be illuminated evenly and brightly, giving a good appearance and reducing power consumption due to lamp lighting.Additionally, by integrating the light guide plates of the analog display and digital display, processing and assembly of the light guide plate can be simplified. Furthermore, since the analog display section can also serve as a dial, the cost reduction effect is significant, and the structure of the illumination mechanism can be easily configured, which has many advantages.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a partial sectional view taken along section A-A in FIG. 1, and FIG. 3 is a plan view of a light guide plate for illumination of the present invention. DESCRIPTION OF SYMBOLS 1...Analog display means, 2...Digital display means, 10...Light guide plate, 10A...Light guide plate part for digital illumination, 10B...Light guide plate part for analog illumination, 10C...Notch, 19... Lamp, 20...
...Mark, 21...Lighting button.

Claims (1)

[Claims] 1. In an illuminated watch that is equipped with an illumination mechanism and an analog display section with a pointer and a digital display section with a liquid crystal panel, a cross-sectional view of the pointer of the analog display section and the liquid crystal panel of the digital display section is shown. They are arranged at substantially the same height, and a light guide plate for illumination is provided on both of the display sections, and a light guide plate for illumination disposed on the analog display section and a light guide plate for illumination disposed on the digital display section are arranged. An illuminated timepiece characterized in that a light plate and an illumination lamp are disposed at substantially the same height in cross section, and further the illumination lamp is disposed in a boundary area between both display parts.