JPS61221781A - Display element - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a display element, and relates to a display element that constitutes images and characters, such as a large electric display panel used in baseball stadiums, stadiums, etc. Regarding lenses.

[Conventional technology]

Previously, a display device has been proposed in which a fluorescent lamp bent into a substantially U-shape is used as a light source as a display element (Japanese Patent Application No. 111997/1982). This display element includes a fluorescent lamp whose intermediate portion is bent to form a planar substantially U-shape and whose bent surface is used as a light-emitting display portion, a hood that encloses the lamp, and a front opening of the hood that allows the lamp to emit light. It consists of a front lens attached opposite the display surface.

[Problem that the invention seeks to solve]

The front lens of the display element with the above configuration is simply made of a spherical surface, so if you try to widen the output angle to widen the left and right light distribution in order to widen the viewing angle, the focal point of the lens will be i.
The middle of the light source is enlarged, resulting in insufficient central luminous intensity, and if you try to make the central luminous intensity sufficient, the spread of the left and right light distribution will be insufficient.In particular, display elements in large display devices used even in the daytime are In order to improve visibility even in the daytime, it is necessary to increase the central luminous intensity while maintaining the spread of light distribution in the left and right directions, but there is a problem that the luminous intensity is insufficient with simply a spherical lens.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a display element that can improve the central luminous intensity by maintaining the spread of light distribution in the left and right direction so that the entire front lens shines when viewed directly from the front.

[Means for solving problems]

The display element of the present invention includes a light source such as a fluorescent lamp, which is formed into a substantially U-shape in plan with a bent middle part and uses this bent surface as a light-emitting display part, a hood containing the light source, and a front opening of the hood. and a front lens attached to face the light emitting display surface of the light source, and the front lens includes a central lens part having a focal point on the center line of the light source, and formed above and below the central lens part, respectively. and a peripheral lens part having an optical axis parallel to the center line of the light source and having a focus on the light emitting part of the light source.

[Function] The display element of the present invention is arranged in large numbers on the display surface to form picture elements, and the optical axis of the peripheral lens parts formed above and below the central lens part of the front lens of this display element is aligned with the central lens part. Since the optical axis of the lens section is shifted vertically and horizontally, the center luminous intensity can be increased while maintaining this horizontal light distribution.

〔Example〕

The configuration of an embodiment of the present invention will be explained with reference to FIGS. 1 to 5.

Reference numeral 1 denotes a display element, and as shown in FIG. 3, a large number of display elements are arranged in the vertical and horizontal directions so as to form a plurality of picture elements on a display panel 2 installed outdoors. The display elements 1 are attached to the light-emitting unit boxes 3 for each picture element provided on the back surface of the display panel 2, and the front part of each display element 1 has a large number of attachments formed on the display panel 2. It protrudes from hole 4. Further, this box 3 has a built-in lighting control device connected to the display element 1, and furthermore, a video signal input connector and a power supply connection connector (not shown) are provided on the back side of the box 3.

As shown in FIGS. 1 and 2, the display element 1 includes a light source 6 such as a fluorescent lamp, which is formed into a substantially U-shaped plane with a bent middle portion, and this bent surface is used as a light-emitting display portion 5. A cylindrical 7-door 7 containing a light source 6, a front lens 9 attached to the front opening 8 of the hood 7 facing the light emitting display section 5 of the light source 6, and a front lens 9 attached to the rear end of the hood 7. and a cap part 10 for connecting the light source 6 to the light emitting unit box 3. The front lens 9 of the display element 1 includes a central lens part 11 having a focal point F1 on the center line L1 of the light source 6, and a front lens 9 formed on the upper and lower sides of the central lens part 11, parallel to the center line L1 of the light source 6. Optical axis L2. The light emitting portion of the light source 6 includes two peripheral lens portions 12 each having a focal point F2.

Next, the operation of this embodiment will be explained.

When the light source 6 is turned on, the front lens 9 is emitted from the light emitting display section 5 of the light source 6.
The light incident on the central lens portion 11 of the light source 6 is emitted forward, and since the light emitting display portion 5 of the light source 6 extends in the horizontal direction, almost the entire light source 6 is illuminated directly from the front, and the light emitted from the light source 6 is properly illuminated from the left and right. Light distribution.

Further, the light incident on the peripheral lens portion 12.12 of the front lens 9 is directed to the optical axis L21L2 of this peripheral lens portion 12.12.
is shifted vertically and horizontally from the optical axis L1 of the central lens portion 11, so the entire front lens 9 shines when viewed from directly in front. That is, as shown in FIGS. 4 to 7, from the light emitting part of the light source 6 to the upper right 1 of the peripheral lens part 12 of the front lens 9,
Since the focus of the light incident on 2a (FIG. 6) is on the light emitting part, the upper right part 12a of the peripheral lens part 12 is illuminated from the front, and other parts of this peripheral lens part 12.12 are also illuminated in the same way. .

In this way, the left and right light distribution is expanded and the luminous intensity is improved without expanding the intermediate focus F1 of the light source 6.

Next, another embodiment will be described with reference to FIGS. 8 to 10.

In the previous embodiment, the front lens 9 was formed entirely as a lens with a smooth surface, but in this embodiment, the front lens 9 was formed with a Fresnel lens.

The other structure and operation of this embodiment are the same as those of the previous embodiment.

〔Effect of the invention〕

According to the present invention, the hood is formed into a substantially U-shape in plan with a bent middle portion, and is attached to the front opening of the hood containing the light source with the bent surface as the light emitting display portion, facing the light emitting display portion of the light source. The front lens includes a central lens portion having a focal point on the center line of the light source, and a front lens formed on the top, bottom, right and left sides of the central lens portion, and having an optical axis parallel to the center line of the light source, and a light emitting portion of the light source. Since a peripheral lens portion having a focal point is formed, the light distribution in the left and right direction is expanded and the center luminous intensity is improved.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional plan view of a display device showing an embodiment of the present invention, FIG. 2 is a front view of the same as above, FIG. 3 is a vertical cross-sectional side view of a display device using the above display element, and FIG. 4 is a front view of same as above. A front view of the lens, FIG. 5 is a plan view explaining the focal point of the above, FIG. 6 is a side view explaining the function of the peripheral lens part of the above, FIG. 7 is a rear view of the peripheral lens part of the same as the above, and FIG. 8 shows another example. FIG. 9 is a front view of the front lens of the display element shown in FIG.
i12 is a bright side view and FIG. 10 is a rear view explaining the function of the peripheral lens portion same as above. 1. Display element, 5. Light emitting display section, 6. Light source, 7.
・Hood, 9...Front lens, 11...Central lens part,
12... Peripheral lens section. March 27, 1985

Claims (1)

[Claims] (1) A light source that is formed into a substantially U-shape in plan with a bent middle part and uses this curved surface as a light-emitting display part, a hood that encloses this light source, and a front opening of the hood that has a light-emitting display part of the light source. The front lens consists of a central lens part having a focal point on the center line of the light source, and a lens part parallel to the center line of the light source formed on the upper and lower sides of the central lens part, respectively. A display element having an optical axis and comprising a peripheral lens part having a focus on a light emitting part of the light source.