JP4535504B2 - Illumination lens structure. - Google Patents

Description

  The present invention relates to a liquid crystal backlight light source LED, a camera auxiliary light source LED, and the like in a mobile phone, and more particularly to a structure of an illumination lens that effectively controls the directivity of the LED light source.

Conventionally, it is a surface mount type light emitting diode provided for electronic devices pursuing lightness, small size, small size, and generally used in LED for liquid crystal backlight light source and camera auxiliary light source LED in mobile phones. In order to condense or diverge the light from the light source, a lens is arranged in front of the light source to control light emission. Also, different directivity was obtained without changing the lens by dynamically moving the relationship between the lens position and the light source. (For example, see Patent Document 1)
Japanese Patent Application Laid-Open No. 2004-226509 (pages 4-6, FIG. 5, FIG. 8)

  FIG. 7 is a cross-sectional view showing the configuration of the strobe device. In FIG. 7, the strobe device 11 is composed of a light emitting unit 15 comprising an LED chip 12 as a light source, a reflector 13 and a diffuser plate 14, and a concave lens 16 that diffuses and projects light from the light emitting unit 15 forward. And attached to a circuit board 17 (for example, a printed circuit board). The light emitted from the LED chip 12 as the light source is first, the light transmitted through the diffuser plate 14 is transmitted through the concave lens 16 and is projected radially and expanded forward. Thereby, it emits as a point light source, and the light of the LED chip 12 with strong directivity can be irradiated over a wide range. In this case, only one type of light control can be applied to one lens, and a plurality of directivities cannot be obtained. In order to obtain multiple directivities, it is necessary to change the lens and reflector (reflective cup) or change the position of the light source.

  Therefore, as shown in the sectional view of the apparatus for moving the relationship between the lens position and the light source in FIG. 8, it is arranged in front of the LED chip 12 as the light source and is along the optical axis of the concave lens 16 held by the lens frame 18. A moving device 19 configured to be movable back and forth is disposed. A transparent cover glass 20 is disposed in front of the concave lens 16.

  As described above, the irradiation angle of light from the LED chip 12 can be varied by moving the concave lens 16 along the optical axis.

  As shown in FIG. 8, a problem to be solved requires a moving device having a complicated structure in order to change the distance between the light source and the lens by moving the lens. Otherwise, you have to prepare multiple lenses and reflectors with different curvatures. There were problems such as.

  The present invention eliminates the above-mentioned drawbacks, and its purpose is to form a plurality of curved surfaces with different curvatures on one lens, place a light source at one vertex of the lens, and rotate the lens. The present invention provides a structure of an illumination lens with variable directivity.

  In order to achieve the above object, the illumination lens structure according to the present invention includes an LED chip mounted on a printed circuit board, and a lens having directivity in the light emitting direction of the LED chip disposed on the front surface of the LED chip. In the structure of the lens, the shape of the lens is a regular tetrahedron having four vertices, and in the four vertices, four curved surfaces having different curvatures passing through the three vertices are formed. The LED chip is arranged in the vicinity of any one vertex.

  In the illumination lens structure in which an LED chip is mounted on a printed circuit board and a lens having directivity in the light emitting direction of the LED chip is disposed on the front surface of the LED chip, the lens has a positive shape having four vertices. In the tetrahedron, an LED chip is disposed in the vicinity of one arbitrary vertex, and the other three vertexes are held and fixed by a holding member (holder).

  In addition, among the four vertices constituting the lens, an LED chip is disposed in the vicinity of one arbitrary vertex, and the other three vertices are held and fixed by a holding member (holder). The directivity can be varied by emitting light from curved surfaces having different curvatures only by rotating the individual lenses.

  In the illumination lens structure of the present invention, a plurality of curved surfaces with different curvatures are formed on one lens, and the lens is held and fixed to a holder or the like so that the desired curved surface becomes the exit surface. Sex can be obtained. It is possible to provide an illumination lens structure with a simple structure and excellent reliability.

  The structure of the illumination lens of the present invention will be described with reference to the drawings.

  1 and 2 relate to an embodiment of the present invention, FIG. 1 is a perspective view showing a structure of an illumination lens, and FIG. 2 is a schematic view thereof.

  1 and 2, reference numeral 1 denotes a regular tetrahedral lens having four vertices a, b, c and d. The lens 1 has a curved surface that passes through the other three vertices b, c, and d facing the vertex a as A (curvature A1). Similarly, the other three vertices c, d, A curved surface passing through a is B (curvature B1), similarly, a curved surface passing through the other three vertices a, b, and d is facing C (curvature C1) and facing the vertex c. Let D (curvature D1) be a curved surface passing through the three vertices a, b, and c. The curvatures A1, B1, C1, and D1 of the four curved surfaces A, B, C, and D are formed different from each other.

  Among the four vertices of the regular tetrahedral lens 1, for example, as shown in FIG. 1, an LED chip 3, which is a light source mounted on the printed circuit board 2, is arranged near the vertex a. Set up. The light emitted from the LED chip 3 is emitted in the direction of the curved surface A passing through the three apexes b, c, and d located on the front surface thereof. The emitted light is transmitted through a lens having a curvature A1, so that light from a highly directional LED light source can be irradiated over a wide range.

  In order to hold and fix the regular tetrahedral lens 1 with a holding member (not shown), the LED chip 3 is disposed among the four apexes a, b, c, and d constituting the lens 1. The lens 1 is held and fixed at the other three vertices (b, c, d in FIG. 1) excluding the nearby vertex (a in FIG. 1). The lens 1 can be fixed in a stable state because of the three-point support. As will be described later, the lens 1 is rotated so that the LED chip 3 is disposed in the vicinity of the vertex facing the curved surface having a desired curvature, and is held and fixed at the other three vertices. It is possible to change the directivity by emitting light from a certain LED chip 3.

  3-6 is explanatory drawing which shows the form radiate | emitted from the curved surface from which a curvature differs by changing the position of the light source of one lens.

  FIG. 3 is an explanatory diagram showing a form in which a light source is arranged at the apex a of the lens and is emitted from the curved surface A. FIG. In FIG. 3, the LED chip 3 mounted on the printed circuit board 2 is disposed in the vicinity of the apex “a” of the lens 1. Light emitted from the LED chip 3 is irradiated from a curved surface A (curvature A1) passing through the other three apexes b, c, and d of the lens 1.

  Similarly, the lens 1 is rotated and the position of the EDL chip 3 is set to a curved surface B (curved surface passing through the vertices c, d, a) corresponding to the vertex b in FIG. 4 and the emitted light from the LED chip 3. In FIG. 5, the vertex c is a curved surface C (a curved surface passing through the vertices d, a, and b) corresponding to the light emitted from the LED chip 3. Similarly, in FIG. 6, a vertex d is a curved surface D (a curved surface passing through the vertices a, b, and c) corresponding to the light emitted from the LED chip 3.

  In the structure of the illumination lens having the above-described configuration, in order to change the directivity of light, conventionally, a plurality of lenses are prepared and replaced, or one lens is moved by a complicated device. In the present invention, a light source is arranged at one vertex of one regular tetrahedron lens, and a curved surface passing through the other three vertices is formed into a curved surface having a different curvature, and at the same time, a desired curved surface. Hold and fix the three apexes of the lens with a holder so that becomes the exit surface. By doing so, desired directivity can be obtained with one lens. An illumination lens structure having a simple structure and excellent reliability can be provided.

It is a perspective view which shows the structure of the lens for illumination concerning the Example of this invention. It is a schematic diagram of the structure of the lens for illumination of FIG. In FIG. 1, it is explanatory drawing which shows the form which arrange | positions a light source to the vertex a of a lens, and radiate | emits it from the curved surface A. FIG. In FIG. 1, it is explanatory drawing which shows the form which arrange | positions a light source to the vertex b of a lens, and makes it radiate | emit from the curved surface B. FIG. In FIG. 1, it is explanatory drawing which shows the form which arrange | positions a light source to the vertex c of a lens, and makes it radiate | emit from the curved surface C. FIG. In FIG. 1, it is explanatory drawing which shows the form which arrange | positions a light source to the vertex d of a lens, and is made to radiate | emit from the curved surface D. FIG. It is sectional drawing which shows the structure of the conventional strobe device. It is sectional drawing of the apparatus which moves the relationship between a lens position and a light source in FIG.

Explanation of symbols

1 Lens 2 Printed circuit board 3 LED chip
a, b, c, d vertices
A, B, C, D curved surface
A1, B1, C1, D1 curvature

Claims (3)

  In an illumination lens structure in which an LED chip is mounted on a printed circuit board and a lens having directivity in the light emitting direction of the LED chip is disposed on the front surface of the LED chip, the shape of the lens is a regular tetrahedron having four vertices. In the four vertices, four curved surfaces having different curvatures passing through the three vertices are formed, and an LED chip is disposed in the vicinity of any one of the four vertices. The structure of an illumination lens.   In an illumination lens structure in which an LED chip is mounted on a printed circuit board and a lens having directivity in the light emitting direction of the LED chip is disposed on the front surface of the LED chip, the shape of the lens is a regular tetrahedron having four vertices. The structure of the illumination lens is characterized in that an LED chip is disposed in the vicinity of one arbitrary vertex, and the other three vertices are held and fixed by a holding member (holder). Among the four vertices constituting the lens, an LED chip is disposed in the vicinity of one arbitrary vertex, and the other three vertices are held and fixed by a holding member (holder). 3. The illumination lens structure according to claim 1, wherein the directivity can be varied by emitting light from curved surfaces having different curvatures only by rotating the lens.

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