JP2006108048A - Luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a luminaire capable of irradiating light with uniform illuminance and a clear profile on an object to be irradiated. <P>SOLUTION: A light shielding mask 24 is arranged on an incidence plane side of a fly eye lens 23 to face it. Light entering each lens part 23b is individually regulated by the light shielding mask 24 to prohibit other lens part 23b to irradiate light on an area where the light irradiated on the irradiation surface 50 by a reference lens part 23b located in a central part is not superimposed when the fly eye lens 23 irradiates incident light on an irradiation surface 50 at a set distance C. Thereby, the luminaire 1 realizes irradiation of the light with uniform illuminance and the clear profile on the object to be irradiated at an irradiation distance beyond the set distance C. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an illumination device that emits light emitted from a light source to a specific irradiation area with uniform illuminance using a fly-eye lens.

For example, an in-vehicle illumination device such as a map lamp needs to irradiate a specific irradiation area with light of uniform illuminance. For example, as disclosed in Japanese Patent Application Laid-Open No. H10-133707, the specific irradiation region is irradiated with light having a uniform illuminance by using light from a light source and a fly-eye lens in which a plurality of lens units are arranged in a matrix. This can be realized by making the light incident on.
JP 2001-337204 A

  By the way, in this kind of illuminating device, the light beam emitted from each lens unit is emitted from a position shifted from each other in accordance with the arrangement position of each lens unit. Therefore, there is a shift in the outline of each light beam irradiated to the irradiation target, and as a result, the outline of the light beam (irradiation pattern) that is finally formed is blurred due to the superposition thereof, which may give the user a sense of incongruity. is there.

  This invention is made | formed in view of the said situation, and it aims at providing the illuminating device which can irradiate the light of uniform illuminance with a clear outline part with respect to irradiation object.

  The present invention is directed to a light source, a fly-eye lens having a plurality of lens portions that respectively emit light emitted from the light source and superimposed on a specific irradiation area, and an incident surface of the fly-eye lens. A light-shielding mask that restricts light incident on the fly-eye lens from the light source, and the light-shielding mask is a lens part other than the specific lens part located at the center of each lens part. When the fly-eye lens irradiates light irradiated from the light source onto an irradiation surface separated by a set distance, the specific lens unit irradiates the irradiation surface. The other lens unit is prohibited from irradiating light to a region that does not overlap with light.

  According to the illumination device of the present invention, it is possible to irradiate the irradiation target with light having a uniform illuminance with a clear outline.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The drawings relate to an embodiment of the present invention, FIG. 1 is a cross-sectional view of a main part of the illumination device, FIG. 2 is an exploded perspective view of the illumination device, FIG. 3 is a plan view of a light-shielding mask, and FIG. FIG. 5 is an explanatory diagram showing an irradiation area by each lens unit.

  In FIG. 1, the code | symbol 1 shows the illuminating device suitable for a vehicle-mounted map lamp etc., for example. The illuminating device 1 includes a light source unit 10 using, for example, a surface-mounted light emitting diode (LED) 12 as a light source, and a lens optical system unit 20 provided on the light source unit 10.

  As shown in FIGS. 1 and 2, the light source unit 10 has an LED substrate 11. The LED substrate 11 holds the LED 12 by soldering or the like at a substantially central portion thereof, and further electrically connects the held LED 12 to a power source (not shown). Here, in order to improve the light emission efficiency of the LED 12, the radiation fins 13 are fixed to the back surface of the LED substrate 11.

  The lens optical system unit 20 includes a lens housing 21, a collimation lens 22 housed and held in the lens housing 21, and a fly-eye lens 23. Furthermore, the lens optical system unit 20 includes a light shielding mask 24 that faces the incident surface of the fly-eye lens 23 in the lens housing 21.

  As shown in FIG. 2, in this embodiment, the lens housing 21 has a substantially rectangular tube shape, and an LED insertion port 30 is opened at one end in the optical axis direction. Further, at the other end of the lens housing 21 in the optical axis direction, an illumination light exit port 31 is opened at a position facing the LED insertion port 30. As shown in FIG. 1, when the lens housing 21 is crowned on the light source unit 10, the LED 12 is exposed to the inside through the LED insertion port 30, and the emission plane 12 a of the LED 12 is opposed to the emission port 31.

  The lens housing 21 has a lens insertion opening 33 that opens to one side, and collimation lens holding grooves that face each other in order from the LED insertion opening 30 side on the inner surface of each side wall adjacent to the lens insertion opening 33. 35, a light shielding mask holding groove 36 and a fly-eye lens holding groove 37. Further, on the LED insertion port 30 side of the collimation lens holding groove 35, the lens housing 21 has a light shielding plate 38 that divides the interior into an LED insertion port 30 side and an emission port 31 side. Is an opening 38a corresponding to a lens portion 22b of the collimation lens 22 described later.

  The collimation lens 22 is, for example, a lens member in which a lens portion 22b is integrally formed on the emission side of a substantially rectangular planar lens substrate 22a inserted and held in the collimation lens holding groove 35. The collimation lens 22 converts the light incident from the LED 12 through the opening 38a of the light shielding plate 38 into substantially parallel light by the lens portion 22b and emits the light.

  The fly-eye lens 23 includes a plurality of (for example, for example, an incident surface protruding downward and an emission surface protruding upward on a substantially rectangular lens substrate 23a inserted and supported in the fly-eye lens holding groove 37. 5 × 5 lens portions 23b are lens members integrally formed in a matrix. Then, the fly-eye lens 23 uniformly irradiates a specific irradiation area Al (see FIG. 5) by superimposing light incident on the lens portions 23b from the collimation lens 22 to each other.

  The light shielding mask 24 is a plate-like member having a substantially rectangular shape that is inserted and supported in the light shielding mask holding groove 36, and an opening 24a corresponding to each lens portion 23b of the fly-eye lens 23 is formed in a matrix at a substantially central portion thereof. It has a shape. Each opening 24a of the light shielding mask 24 is individually set in accordance with the arrangement position of the corresponding lens portion 23b, so that the light shielding mask 24 is changed from the collimation lens 22 to the fly-eye lens 23. The light incident on is limited to a predetermined value.

  Here, the light-shielding mask 24 is a specific lens portion 23b (in the present embodiment, a third-row third-column lens portion; hereinafter, a reference lens portion) located at the center of the lens portions 23b on the fly-eye lens 23. In the case where the light incident on the other lens portions 23b (except also) is individually limited, and the fly-eye lens 23 irradiates the incident surface 50 separated from the collimation lens 22 by the set distance C. 4 (see FIG. 4), the other lens unit 23b is prohibited from irradiating light to a region that does not overlap with the light irradiated to the irradiation surface 50 by the reference lens unit 23b. 4 shows the relationship between the reference lens portion 23b and another lens portion 23b adjacent to the reference lens portion (for example, the lens portion in the fourth row and the third column). In FIG. 24 shields light indicated by a two-dot chain line in the drawing by a light shielding portion 24b that partitions the openings 24a.

  More specifically, in the present embodiment, each of the light shielding portions 24b partitioning the openings 24a at each position on the light shielding mask 24 is widened so as to be separated from the central portion. The aperture ratio of the opening 24a facing the other lens portion 23b is smaller as the aperture is separated from the opening 24a facing the reference lens portion 23b. In this embodiment, the aperture ratio of the opening 24a facing the reference lens portion 23b is 100%.

In this case, for example, an opening 24a (third row and third column opening) corresponding to the reference lens portion 23b, and an opening 24a (fourth row and third column opening) adjacent below the opening 24a. The width αy4 (see FIG. 3) in the column direction of the light-shielding portion 24b that divides can be set as follows from the relationship shown in FIG. That is, the width in the column direction of each lens unit 23b is Y, the distance in the column direction from the center of the reference lens unit 23b to the center of the other lens unit 23b is A, and each lens unit 23b is placed on the irradiation surface 50 separated by the set distance C. , The width αy4 of the light shielding part 24b is a value that satisfies the relationship of the following equation (1).
αy4 = Y × (A / B) (1)
Similarly, with respect to the width αy (αy1, αy2, αy5) in the column direction and the width αx (αx1, αx2, αx4, αx5) in the row direction of the other light shielding portion 24b, the same relational expression as in (1) above. It is possible to set based on

  With this configuration, the light shielding mask 24 prohibits the other lens unit 23b from irradiating light to a region that does not overlap with the light irradiated by the reference lens unit 23b onto the irradiation surface 50 (see FIG. 5). Here, in FIG. 5, the light beam l (3, 3) emitted from the reference lens portion 23b, the light beam l (1, 5) emitted from the lens portion 23b in the first row and the fifth column, and the lens in the second row and the fourth column. Luminous flux l (2, 4) emitted from the portion 23b, luminous flux l (4, 2) emitted from the lens portion 23b in the fourth row and second column, and luminous flux l (from the lens portion 23b in the fifth row and first column) 5 and 1), the hatched areas are areas where irradiation is prohibited by the respective light shielding portions 24b of the light shielding mask 24.

  As shown in FIG. 5, the light irradiation region l (3, 3) that the reference lens unit 23 b irradiates the irradiation surface 50 is a specific irradiation region Al that the fly-eye lens 23 irradiates with uniform light as a whole. It is desirable that they match.

  Here, reference numeral 45 in FIG. 2 denotes a side plate. The side plate 45 is configured such that the lenses 22 and 23 and the light shielding mask 24 are accommodated in the lens case 21 and then adhered to the lens case 21 with, for example, an adhesive tape. The lens insertion port 33 is closed.

  According to such a form, the light-shielding mask 24 is disposed opposite to the incident surface side of the fly-eye lens 23, and the fly-eye lens 23 irradiates the irradiation surface 50 that is separated from the set distance C by the light-shielding mask 24. In this case, the light incident on each lens unit 23b is individually controlled so as to prohibit the other lens unit 23b from irradiating the region where the reference lens unit 23b located at the center does not overlap the light irradiated on the irradiation surface 50. By limiting to the above, it is possible to irradiate the irradiation target with light having a uniform illuminance with a clear contour portion at an irradiation distance of the set distance C or more.

  In the above-described embodiment, the irradiation distance C can be set as appropriate according to the application of the lighting device 1 and the like, and the opening state of each opening 24a of the light shielding mask 24 depends on the irradiation distance C. Of course, it will change.

Cross section of the main part of the lighting device Exploded perspective view of lighting device Plan view of shading mask Explanatory drawing which shows the relationship of the emitted light from each lens part Explanatory drawing which shows the irradiation area by each lens part

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Illuminating device, 12 ... Light emitting diode (light source), 23 ... Fly eye lens, 23 ... Lens part, 24 ... Light shielding mask, 24a ... Opening part, 24b ... Light shielding part, Al ... Specific irradiation area, C ... Setting distance
Agent Patent Attorney Susumu Ito

Claims (1)

A light source;
A fly's eye lens having a plurality of lens portions that respectively emit light emitted from the light source and superimposed on a specific irradiation region; and
A light-shielding mask that faces the incident surface of the fly-eye lens and restricts light incident on the fly-eye lens from the light source;
The light-shielding mask individually restricts incident light to the other lens units except for the specific lens unit located at the center of the lens units, and the fly-eye lens is the light source. Prohibiting the other lens unit from irradiating light to a region where the specific lens unit does not overlap with the light irradiating the irradiation surface when irradiating the irradiation surface separated from the irradiation surface by the light incident from A lighting device characterized by the above.

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