JPH0121339Y2 - - Google Patents

Description

[Detailed Description of the Invention] a. Technical Field This invention relates to a light emitting display device used, for example, as a level meter.

b. Prior Art and Disadvantages Conventionally, in a level meter display using a light emitting diode, the light emitting surface is optically separated for each level.

However, most of the input physical quantities that should be displayed on the level meter are continuous in nature, and displaying these input physical quantities as several separate levels gives the viewer a sense of strangeness. Feel. For example, if the currently displayed top level blinks due to input fluctuations, one clearly demarcated area will blink, resulting in so-called display flickering, which can irritate the viewer. It will also happen.

c. Purpose of the invention The object of this invention is to provide a light emitting diode display device in which the light emitting surface is optically continuous and the divisions of light emission are clear.

d Features of the invention The light emitting display device according to the invention is composed of a substrate, a housing, a rod lens, and a light diffusion sheet, and the substrate has a plurality of light emitting diode elements incorporated on a wiring pattern formed on its surface, and the housing A hole is formed at the bottom of the U-shaped groove corresponding to the light emitting diode element on the substrate, and the rod lens is held on the substrate, and the rod lens is held in the groove of the housing. , the diffusion sheet is characterized in that it is provided with a sawtooth-like notch in the longitudinal direction, and that the diffusion sheet is attached to the upper part of the housing.

e Description of the Embodiment Fig. 1 is an explanatory diagram showing an embodiment of this invention, Fig. 2 is a longitudinal sectional view of the embodiment shown in Fig. 1, and Fig. 3 is an explanatory diagram showing its light emitting state. be.

In FIGS. 1 and 2, 10 is a substrate, on the surface of which a wiring pattern 12 is formed. A plurality of light emitting diode elements 11 are each fixed at a predetermined position using, for example, a conductive paste and wire bonded. 13 is a so-called external connection terminal, and 14 is a notch for attachment. 20 is a housing;
For example, it is made of white synthetic resin. The housing 20 is provided with a groove having a U-shaped cross section, and a hole 21 in the shape of a dome, for example, is bored at the bottom of the groove at a position corresponding to the light emitting diode element 11 of the substrate 10.

Reference numeral 30 is a rod lens made of, for example, transparent acrylic resin, and is provided with sawtooth-shaped notches in the longitudinal direction. The pitch at which the notches are provided is equal to the arrangement pitch of the light emitting diode elements 11, and the tips of the saw teeth are chamfered, for example, into a flat surface. The rod lens 30 is fitted into the U-shaped groove of the housing 20 and fixed appropriately.

Reference numeral 40 denotes a light diffusion sheet, which is made of, for example, a translucent synthetic resin sheet. Since this light diffusion sheet 40 is attached to the upper part of the housing 20, its surface becomes a light emitting surface.

In the embodiment configured as described above, the light emitted by supplying an appropriate current to the light emitting diode element 11 is transmitted through the hole 2 of the housing 20.
1 or is reflected by the side wall of the hole 21 and enters the rod lens 30.

When the light emitted from the rod lens 30 is viewed through the light diffusion sheet 40, it becomes continuous light emission 41 as shown in FIG. Moreover, the portion where the rod lens 30 is in contact with the light diffusion sheet 40 shines strongly. Although the above-mentioned embodiment describes a device that emits light in a straight line, the invention is not limited to this, and may also emit light in a curved manner. In this case, the light emitting diode elements may be arranged in a curved line, and a housing, rod lens, etc., shaped to correspond to this curve may be used.
Furthermore, a lead frame may be used as the substrate 10. Further, in the embodiment, a device that emits light in one row has been described, but a device that emits light in two rows can also be obtained by forming similar structures in two rows on the same substrate.

f Effect Since the light emitting display device according to the present invention emits light continuously, the input physical quantity is displayed as one continuous bar graph, which is easy to see because the input physical quantity can be intuitively grasped. In addition, since changes in display level due to changes in input appear as changes in the length of the entire bar, the flickering sensation is significantly reduced. Furthermore, since the level of the bar graph display is clearly displayed depending on the intensity of the light, it can also serve as an accurate display device for input physical quantities.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram showing one embodiment of this invention, Figure 2 is a cross-sectional view of the embodiment shown in Figure 1, and Figure 3 is the light emission of the embodiment shown in Figures 1 and 2. It is an explanatory diagram showing a state. DESCRIPTION OF SYMBOLS 10...Substrate, 20...Housing, 30...Bar lens, 40...Light diffusion sheet.

Claims (1)

[Scope of utility model registration request] It consists of a substrate, a housing, a rod lens, and a light diffusion sheet, the substrate has a plurality of light emitting elements installed in a linear manner on its surface, the housing has a groove formed therein, and the bottom of the groove has a light emitting element on the substrate. A hole is formed corresponding to the element, and the rod lens is mounted on the substrate, and the rod lens is held in a groove of the housing, and is arranged longitudinally at substantially the same pitch as the arrangement pitch of the plurality of light emitting elements. A serrated notch is provided along the rod lens, and the serrated notch is connected to a radial notch surface of the rod lens, a cross section obliquely crossing the central axis of the rod lens, and the radial notch surface. 1. A light emitting display device having a flat surface whose upper end surface is cut out parallel to a lens center axis, and wherein the light diffusion sheet is attached above the housing so as to be substantially in contact with the flat surface.