JPH031837Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a light guide plate for watches and instruments that more efficiently guides light emitted from a light source with less loss, fits in a small space, and is easy to design, process, etc.

Conventionally, as shown in FIGS. 1 and 2, a light guide plate 1 having a pointer P is made of a transparent synthetic resin material, and is formed as a pair of substantially elliptical shapes 2, 2 when viewed from above. When the light guiding surface and the light source 3 are at different heights as shown in FIG. 2, it is necessary to bend a portion of the elliptical portion 2 downward to form the bent surface portion 4.

Therefore, light loss may occur due to uneven bending, and the processing itself may be complicated.
It has drawbacks such as requiring a large amount of space. The present invention has been devised in view of these points, and its contents will be explained below based on the illustrated embodiments.

Reference numeral 10 denotes a light guide plate body made of transparent synthetic resin, which has a pointer section 11 in the center, and approximately elliptical light guide wing sections 12 arranged on the left and right sides of the pointer section 11. This light guide wing section 12
are stretched horizontally. Reference numeral 13 designates a notched cylindrical portion that hangs down from the edge of the light guide wing portion 12 and forms prism reflective surface portions 14 and 15. 16
is a lamp serving as a light source, and its center Q is placed on the center line R of the notched cylindrical portion 13 and on the center line S of the lower prism reflective surface portion 15. Reference numeral 17 denotes an ellipsoidal surface portion of the light guiding wing portion 12, which forms an ellipsoidal surface having a focal point at the center of the light source 16 and the pointer portion 11. 18 is a clock movement.

Next, the operation of the present invention having the above configuration will be explained.

The light emitted from the center Q of the light source 16 is transmitted to the notched cylindrical portion 1.
The light is reflected at a right angle by the prism reflection surface section 15 of No. 3, and then further reflected at a right angle by the prism reflection surface section 14, and some of the light is directed toward the pointer section 11, while the other part of the light is reflected by the ellipsoid section 17. As a result, the light source 16
The light emitted from the pointer 11 is focused on the pointer section 11.

Therefore, the present invention has the above-mentioned configuration and function, and in particular, the small space W surrounded by the light guiding blade part 12 on the horizontal plane and the notched cylindrical part 13 formed in a hanging manner is The timepiece movement 18 having a certain size can be used without waste, and the hanging distance of the cutout cylindrical portion 13 can be appropriately set according to the thickness of the timepiece movement 18 without any problem. Furthermore, the light source 16 does not need to directly illuminate the clock movement 18;
3, most of the light can be shielded, and no direct light is generated to the clock movement 18 side. Furthermore, since the light from the light source 16 is irradiated and guided not only on the prism reflective surface 15 of the cut-out cylindrical portion 13 but also on the entire inner curved concave surface, the width is smaller than that of a conventional light guide plate, and the light is emitted from the light source. The light can be guided to the pointer section 11 more effectively with less loss. Further, there is no need to take the trouble of bending a part of the elliptical shape downward as in the conventional case, and the light guide plate main body 10 can be formed compactly as a whole.

[Brief explanation of the drawing]

1 to 2 are explanatory diagrams of the prior art, FIGS. 3 to 6 show the product of the present invention, FIG. 3 is a plan view of the main part, and FIG. 4 is a longitudinal cross-sectional side view of the main part, FIG. 5 is a plan view for explaining the traveling state of light, and FIG. 6 is a side view for explaining the traveling state of light. 10... Light guide plate main body, 11... Pointer section, 12...
...Light guiding wing part, 13... Notch cylindrical part, 14, 15...
... Prism reflective surface section, 17... Ellipsoidal surface section.

Claims (1)

[Scope of utility model registration request] A plurality of prism reflective surface portions 1 extend from the edge of the light guiding wing portion 12 extending on a horizontal plane having an ellipsoidal surface portion 17.
The notched cylindrical part 13 having the cylindrical parts 4 and 15 is suspended, and is placed in a small space W partitioned by the notched cylindrical part 13 which is suspended from the edge of the light guiding blade part 12 and the light guiding blade part 12. A light guide plate for watches and instruments in which a watch movement 18 is positioned, and a center Q of a light source 16 is positioned near a center line R of a notched cylindrical part 13 and on a center line S of a lower prism reflective surface part 15.