JPH10208193A - Illumination angle setting prism parallel plate for traffic signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the trouble that signals of two roads are perceived with superposition by adjusting the angle of illumination light by a prism parallel plate and demarcating the illumination range of the signals. SOLUTION: Quadrangular prisms obtained combining two or four triangular prisms alternately, principally, triangular prisms having triangular surfaces where the angle of the border line of light between transmission and total reflection based upon a critical angle is set are combined in parallel so that quadrangular surfaces are successive. Further, prisms having reflection diffusion surfaces 5 formed by cutting short sides of quadrangular surfaces of the prisms combined into a quadrangular prism in a mountain shape at an angle associated with the set angle 4 of the prisms are combined in parallel to form a panel shape. Consequently, light irradiating the prism parallel plate at various angles is reflected totally by each surface of a prism above the critical angle and transmitted at an internal angle. Therefore, projection light becomes a beam from the border line of the set angle to the internal angle and illumination light can not be perceived outside the set range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prism parallel plate for setting an illumination angle of a traffic signal.

[0002]

2. Description of the Related Art Conventionally, in a traffic signal in a place where a neighboring road approaches and signal lighting appears to be overlapped, a mechanism in which a black vertical plate is arranged in front of an illumination window in order to prevent illumination in an oblique direction. Things are used.

[0003]

However, these traffic lights have an unclear difficulty in that signal lights on two roads are overlapped under the conditions of a place, and the present invention is intended to solve this problem. Things.

[0004]

Means for Solving the Problems A boundary line between transmission and total reflection light at a critical angle is mainly formed by a triangular prism having an angled triangular surface, and two or four triangular prisms are alternately arranged. Are combined in a quadratic prism to form a panel-shaped prism-parallel plate. Of the prism parallel plates combined in the same manner, prisms in which the short sides of the square faces of the prisms combined into a quadrangular prism are cut in a mountain shape are arranged in parallel to form a panel-shaped prism parallel plate. In addition, depending on the prism parallel plate described above, an antireflection groove or a black mask is added to a part of the surface of the prism. The present invention is an illumination angle setting prism parallel plate of a traffic signal having the above configuration.

[0005]

[Function] The light of various angles irradiated to the prism parallel plate is
At each surface of the prism, the light is totally reflected at a critical angle or more, and is transmitted at an inner angle. Due to the juxtaposition of the prisms, the chevron-shaped cuts adjacent to each other reflect part of the light and diffuse. Light is absorbed in the anti-reflection groove, and the black mask blocks light.

[0006]

[Embodiment] An embodiment of the present invention will be described below. Combination of two or four triangular prisms with alternating triangular prisms, with a triangular surface with an angled triangular surface, which forms a square prism Were arranged side by side in the form of a series of square faces,
Construct a prism parallel plate. Among the prism parallel plates combined in the same way, the prism combined with the prism diffused surface, which cuts the short side of the square face of the prism combined with the square prism into a mountain shape at the numerical value linked with the prism setting angle, The prisms are arranged in parallel to form a panel-shaped prism parallel plate.
Further, depending on the set angles and combinations of the above-described prism parallel plates, some surfaces of the prism are subjected to a process of adding an antireflection groove of a groove for preventing specular reflection and a black mask. Light of various angles applied to the prism parallel plate is totally reflected on each surface of the prism above the critical angle, and is transmitted at the inside angle. Due to the juxtaposition of the prisms, the chevron-shaped cuts adjacent to one another reflect and diffuse some of the light, preventing partial light blocking caused by the viewing position. Also, light is absorbed in the anti-reflection groove,
The black mask blocks light. The light emitted from the prism parallel plate becomes a beam from the boundary of the set angle to the inside angle. This prism parallel plate is used by attaching it to the illumination window of a traffic signal. It is also used for indoor illumination and illumination deflection of spotlights.

[0007]

The illumination light of the traffic signal is angle-adjusted by the book and the prism parallel plate to divide the illumination range of the signal.
Beam illumination suitable for the boundary setting is performed, and the illumination light cannot be observed outside the setting range. Also, this book, prism parallel plate,
Light emitted from the prism is prevented from forming a stripe shape, and a light gap is prevented.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view (partial) of an illumination angle setting prism parallel plate and a light operation of a traffic signal of the present invention. (A) Combination of four set angles of 30 degrees.

FIG. 2 is a perspective view of a prism combination according to the present invention (part) (A) Quadruple prism (B) Double prism

FIG. 3 is a front view of an illumination angle setting prism side-by-side plate of a traffic signal of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmitted light 2 Boundary line of outgoing light 3 Angular width of outgoing light 4 Setting angle of brhythm 5 Reflection / diffusion 6 Incident light 7 Annihilation light 8 Antireflection groove 9 Black mask

Claims (3)

[Claims] 1. A prism having a triangular prism with an angle set triangular prism, and two or four triangular prisms alternately assembled to define a boundary between light transmitted and total reflection at a critical angle. An illumination angle setting prism parallel plate for a traffic signal, in which the following combinations are arranged in parallel to form a continuous square surface and configured in a panel shape. 2. An illumination angle setting prism for a traffic signal device, wherein prisms each having a rectangular short side cut in a mountain shape are arranged in parallel to each other in the prism combined with a square prism according to claim 1. Board. 3. An illumination angle setting prism parallel plate for a traffic signal, according to claim 1, wherein an antireflection groove or a black mask is added to a part of the surface of the prism of the prism parallel plate.