JPH08189976A - Internally illuminating type clock - Google Patents

Abstract

PURPOSE: To permit the use of a light source of a large amount of light and illuminate the whole of a dial sufficiently bright thereby to make it easy to read a time display, by efficiently scattering the heat generated from the light source and preventing bad influences by the heat. CONSTITUTION: An opening part 2a is formed at a central part of a dial 2 which is formed of a metal of high thermal conductivity. A light introduction plate 3 is arranged at the back of the opening part and a reflecting plate 4 is set at the back of the light introduction plate. An integral engaging pin 2b is projected from a rear face of the dial to fix the light introduction plate and reflecting plate to the dial. The light from a light source 8 is supplied from a window hole 2c into the light introduction plate. The dial 2 functions also as a radiation plate to scatter the heat generated from the light source 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internally illuminated timepiece capable of reading time even in a dark place.

[0002]

2. Description of the Related Art As a conventional internally illuminated timepiece, a light source for illuminating the front surface of a dial is provided with one lamp having a small light quantity.
There is one that makes it possible to read the time by illuminating the dial with the light of this lamp.

[0003]

However, in the above-mentioned conventional internally illuminated timepiece, since only one lamp with a small light quantity is provided, the entire dial cannot be made brighter and the dial of the dial cannot be made brighter. Only part of it was slightly brighter. Therefore, when trying to provide a light source with a large amount of light in order to improve this, parts such as the timepiece machine body mounting plate and dial in the timepiece body are mostly made of plastic and have a poor heat dissipation property. The generated heat may cause deformation of the watch body and parts.

Therefore, an object of the present invention is to dissipate the heat emitted from the light source so as not to cause an adverse effect due to the heat, thereby making it possible to use a light source having a large amount of light so as to illuminate the entire dial sufficiently brightly and display the time. To make it easier to read.

[0005]

In order to achieve the above object, in the internally illuminated timepiece of the present invention, the dial plate is made of a metal having a high thermal conductivity, with an opening formed at the center. .
A light guide plate is provided behind the opening, a reflector is provided behind the light guide plate, and a light source for supplying light into the light guide plate is provided. The dial plate is also characterized in that it also functions as a heat dissipation plate that dissipates heat generated from the light source.

Further, locking pins are integrally provided on the rear surface of the dial plate, and the light guide plate and the reflection plate are
It is characterized by being locked by this locking pin and being fixed to the dial.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, on the front surface of the timepiece frame body 1,
A dial 2 is provided. The dial 2 has a large opening 2a formed in the center thereof and has a donut shape, and is made of a metal having a high thermal conductivity. On the front surface of the dial 2, numbers for indicating the time of "1" to "12" are written.

As shown in FIG. 2, the opening 2a of the dial 2 is shown.
Behind the, is a light guide plate 3 such as a plate made of acrylic resin.
Is provided, and the reflection plate 4 is provided behind the light guide plate 3. A timepiece mechanical body 5 is fixed behind the reflection plate 4, and a pointer shaft 5a is rotationally driven by the timepiece mechanical body 5.
Protrudes forward of the dial 2 through the central portions of the light guide plate 3 and the reflection plate 4, and the protruding end is connected with the pointer 6 including an hour hand 6a, a minute hand 6b, and a second hand 6c. The time display portion including the dial 2 and the hands 6 is covered with a transparent cover 7.

As a fixing means for the light guide plate 3 and the reflection plate 4, a locking pin 2b is integrally projected from the rear surface of the dial plate 2. It is desirable that at least three locking pins are formed along the outer circumferences of the light guide plate 3 and the reflection plate 4. The light guide plate 3 and the reflection plate 4 are snapped to the dial plate 2 by locking the claw portion at the tip of the locking pin 2b to the back surface of the reflection plate 4.

As means for supplying light into the light guide plate 3, window holes 2c, 2c are formed at a plurality of positions behind the dial plate 2 and facing the outer peripheral surface of the light guide plate 3, thereby providing internal illumination. The lamps 8 and 8 serving as light sources for use are mounted by mounting means not shown so that light can be emitted from the window holes 2c and 2c toward the light guide plate 3.

With such a structure, when the lamp 8 is energized, the lamp is lit, and the light of the lamp is supplied into the light guide plate 3 and spreads in all directions. The pointer 6 is raised and displayed by the light diverging forward from the opening 2a into the time display unit. Further, this light is reflected on the inner surface of the transparent cover 7, illuminates the front surface of the dial 2 brightly, and raises the time display character to make it easy to read. Further, the light directed rearward in the light guide plate 3 is reflected by the front surface of the reflection plate 4, and the pointer 6 is lifted forward in the same manner as the above light, and at the same time, reflected by the transparent cover 7 to reflect the dial plate. Illuminate 2 to display the time display character in an easy-to-read manner. In this way, the light supplied by the lamp 8 is used most effectively for the time display.

Further, when the lamp 8 is turned on, heat is generated, and this heat is transmitted to the dial 2 made of a metal having a high thermal conductivity, and the dial 2 serves as a radiator this time. It works and dissipates this heat.

Although a donut-shaped dial is used in this embodiment, various dials such as a quadrangle and an octagon can be used as long as the opening can be provided at the center. It is possible.

[0015]

As described above, in the internally illuminated timepiece of the present invention, since the opening is provided in the central portion of the dial and the dial is made of metal having high thermal conductivity, the light source with a large amount of light is used. Even when the watch is used, the dial functions as a heat dissipation plate to dissipate the heat, so that other components such as a timepiece frame and the like that compose the timepiece are not adversely affected by the heat. Further, since the time display portion can be illuminated sufficiently bright by the light emitted from the light source having a large amount of light, the time can be easily read.

Further, since the locking pin is integrally projected from the rear surface of the dial to fix the light guide plate and the reflection plate,
It can be fixed easily and the assembly work can be shortened.

[Brief description of drawings]

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

FIG. 2 is a partially cutaway sectional view taken along the line AA of FIG.

[Explanation of symbols]

 2 Dial 2a Opening 2b Locking pin 3 Light guide plate 4 Reflector 8 Light source (lamp)

Claims (2)

[Claims] 1. The dial plate has an opening formed in the center thereof and is made of a metal having a high thermal conductivity, and a light guide plate is disposed behind the opening. A reflecting plate is provided behind the light guide plate, and a light source for supplying light into the light guide plate is provided. The dial plate also functions as a heat radiating plate for radiating heat generated from the light source. Internally illuminated watch characterized by. 2. The dial according to claim 1, wherein locking pins are integrally projected from the rear surface of the dial, and the light guide plate and the reflection plate are locked by the locking pins. Internally illuminated watch characterized by being fixed to.