JP2007294197A - Lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting system capable of realizing high unit efficiency and lessening the size in a light axis direction in a simple structure without damaging a uniformity ratio of illuminance, and improving freedom of designing. <P>SOLUTION: A reflecting LED 12 generating parallel light by reflecting irradiation light from a light-emitting element 17at a reflective face 15 is used as a light source, and the parallel light generated by the LED 12 is made incident into each lens part 22b of a fly-eye lens 22. With this, the size of the lighting device 1 in a light axis direction can be diminished without damaging a uniformity ratio of illumination light in a simple structure not relying on a collimation lens or the like. Moreover, since the LED 12 itself generates parallel light by action of the reflective face 15, a mounting position of the LED 12 on an LED substrate 11 has only to be in correct opposition to an incident side of the fly-eye lens 22 without any specific constraint, which enhances freedom of designing. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an illuminating device that uniformly illuminates a specific irradiation area, such as in-vehicle illumination such as a map lamp and a step lamp, or various types of illumination such as downlight and signboard illumination.

In general, in an illuminating device that irradiates light to a specific irradiation area, it is required to irradiate the irradiation area with light of uniform illuminance. As a technique for obtaining light with such uniform illuminance, for example, in Patent Document 1, a light emitting diode (LED) that can be handled as a point light source is used as a light source, and light emitted from the LED is collimated by a collimation lens. A technique for generating illumination light with uniform illuminance by converting into parallel light and making it incident on each lens part of a fly-eye lens and emitting the light made incident on each lens part to a position where they overlap each other is disclosed. .
2005-259653 gazette

  However, in the technique disclosed in Patent Document 1 described above, in order to convert the emitted light from the LED into parallel light by the collimation lens, it is necessary to accurately separate the LED and the collimation lens at an appropriate optical axis distance. Yes, the structure becomes complicated. Moreover, in the above-described technology that requires a predetermined distance between the LED and the collimation lens, only a part of the light beam emitted from the LED is incident on the lens, so the unit efficiency is low, and the size of the illumination device is reduced. There is a limit to downsizing in the axial direction. Further, in the above-described technique, since it is necessary to correspond the LED and the lens portion of the collimation lens on a one-to-one basis, the degree of freedom in design is small, and the arrangement of the LED is greatly limited.

  The present invention provides an illuminating device that realizes high unit efficiency with a simple configuration without impairing the uniformity of illumination light, can reduce the size in the optical axis direction, and can improve the degree of design freedom. The purpose is to do.

  The present invention has a light-emitting element and a reflective surface facing the light-emitting element, a reflective light-emitting diode that generates parallel light by reflecting light emitted from the light-emitting element by the reflective surface, and arranged in a matrix And a fly-eye lens that emits parallel light generated by the reflective light-emitting diodes to the positions where they are incident on the respective lens units and overlap each other.

  According to the illumination device of the present invention, high unit efficiency can be achieved with a simple configuration without impairing the uniformity of illumination light, the size in the optical axis direction can be reduced, and the degree of freedom in design can be improved. it can.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 relate to a first embodiment of the present invention. FIG. 1 is a cross-sectional view of a main part of the lighting device, and FIG. 2 is an exploded perspective view of the lighting device.

  The illuminating device 1 shown in FIGS. 1 and 2 is an illuminating device suitable for, for example, an in-vehicle map lamp. The illuminating device 1 includes a light source unit 10 using a light emitting diode (LED) 12 as a light source, and the light source unit. 10 and a housing 20 that is crowned by 10.

  The light source unit 10 has an LED substrate 11. The LED substrate 11 has, for example, a substantially rectangular shape in a plane, and holds the LED 12 by soldering or the like at a substantially central portion thereof. Further, the LED board 11 is fixed with a connector 13 for electrically connecting the LED 12 to a power supply circuit (not shown). In addition, in order to improve the light emission efficiency of LED12, the LED board 11 is comprised by the aluminum board | substrate etc. with high heat conductivity, for example.

  Here, the LED 12 is composed of a reflective light emitting diode in which a reflective surface 15 is disposed opposite to the light emitting element 17. More specifically, in the present embodiment, the LED 12 has a reflective frame body 14, and the reflective frame body 14 is provided with a reflective surface 15 having a parabolic shape, for example, which is recessed. The reflective frame body 14 is provided with a pair of lead frames 16a and 16b along side walls facing each other. The middle of each lead frame 16 a, 16 b is bent inward at the upper part of the reflection frame 14, so that the end of each lead frame 16 a, 16 b faces the reflection surface 15. Of these lead frames 16a and 16b, one lead frame 16a has its end extending to the focal position of the reflecting surface 15, and the end of the lead frame 16a is on the surface facing the reflecting surface 15. The light emitting element 17 is mounted. The other end of the lead frame 16b is connected to the light emitting element 17 via a lead wire 16c. Thus, the anode and cathode of the light emitting element 17 are electrically connected to the LED substrate 11 via the lead frames 16a and 16b, respectively, and the light emitting element 17 emits light toward the reflecting surface 15 when energized. Then, the reflecting surface 15 generates parallel light by reflecting the light emitted from the light emitting element 17.

  The housing 20 has a cylindrical shape along the optical axis O direction of the LED 12 and accommodates therein a lens optical system 21 for dimming light emitted from the LED 12 into illumination light with uniform illuminance. In the present embodiment, the housing 20 has a substantially cylindrical shape, and an inward flange 20a is provided at the tip. In addition, an outward flange 20 b with which the LED substrate 11 of the light source unit 10 abuts is provided at the base end portion of the housing 20.

  The lens optical system 21 includes a fly-eye lens 22 having an incident surface facing the LED 12, and a spacer 23 interposed between the fly-eye lens 22 and the LED substrate 11.

  For example, the fly-eye lens 22 is formed of a light-transmitting resin molded product in which a plurality of lens portions 22b are integrally formed in a matrix shape inside an annular flange portion 22a whose outer periphery is in sliding contact with the inner periphery of the housing 20. Has been.

  Moreover, the spacer 23 is comprised by the resin molded product which makes the substantially cylindrical shape whose outer periphery slidably contacts with the inner periphery of the housing | casing 20, for example. The spacer 23 has the front end surface in contact with the flange portion 22 a on the incident side of the fly-eye lens 22, thereby separating the fly-eye lens 22 from the LED 12 by a predetermined distance in the optical axis O direction.

  For example, as shown in FIG. 1, the constituent members 22 and 23 of the lens optical system 21 are accommodated in the casing 20 through the opening 20 c on the base side of the casing 20 in the order of the fly-eye lens 22 and the spacer 23. Is done. Then, after housing the constituent members 22 and 23, the LED substrate 11 of the light source unit 10 is fixed to the outward flange 20b of the housing 20 by screws or the like.

  Thereby, the opening 20c on the base side of the housing 20 is closed and the LED 12 is exposed in the housing 20. Further, the fly-eye lens 22 is sandwiched between the spacer 23 whose base end surface is in contact with the LED substrate 11 and the inward flange 20 a of the housing 20. And each lens part 22b of the fly-eye lens 22 radiates | emits a specific irradiation area | region uniformly by radiate | emitting the parallel light which injects from LED12 to the position which mutually overlaps.

  The fixing of the LED substrate 11 to the outward flange 20b is not limited to screwing, and may be performed by, for example, a push nut, heat welding, adhesion, or the like.

  According to such an embodiment, the reflective LED 12 that generates the parallel light by reflecting the light emitted from the light emitting element 17 by the reflecting surface 15 is used as the light source, and the parallel light generated by the LED 12 is used as the fly-eye lens. By making it enter into each lens part 22b of 22, the size of the illuminating device 1 in the optical axis direction can be reduced with a simple configuration without using a collimation lens or the like without impairing the uniformity of the illumination light. In addition, since the LED 12 itself generates parallel light by the action of the reflecting surface 15, most of the light emitted from the light emitting element 17 can be incident on the fly-eye lens 22, and the unit efficiency can be improved. Furthermore, since the LED 12 itself generates parallel light by the action of the reflecting surface 15, the mounting position of the LED 12 on the LED substrate 11 is not particularly limited as long as it is a position facing the incident side of the fly-eye lens 22, The degree of freedom in design can be improved.

  Next, FIGS. 3 and 4 relate to a second embodiment of the present invention, FIG. 3 is a cross-sectional view of a main part of the lighting device, and FIG. 2 is an exploded perspective view of the lighting device. In the present embodiment, the point that the light shielding mask is integrally held on the incident side of the fly-eye lens 22 is mainly different from the first embodiment. In addition, about the same structure, a same sign is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 3, in the fly-eye lens 22, at least the height of the flange surface on the incident side of the flange 22a is such that the height in the direction of the optical axis O substantially matches the height of the incident side of each lens portion 22b. It is formed with. That is, the flange surface on the incident side of the flange 22a protrudes from the LED substrate 11 side with a projection amount substantially the same as the top portion on the incident side of each lens portion 22b. The incident-side flange surface is set as a light-shielding mask holding surface 22 c for holding the light-shielding mask 30 integrally with the fly-eye lens 22.

  As shown in FIGS. 3 and 4, the light-shielding mask 30 is made of a film material having a light-shielding property, and a light-transmitting portion 30a having a predetermined pattern corresponding to each lens portion 22b of the fly-eye lens 22 is formed on the film surface. Is open.

  Here, on the light shielding mask holding surface 22c, a plurality of (for example, three) pins 22d project from the asymmetric position with the optical axis O as the center, and the light shielding mask 30 passes through these pins 22d. Are held on the light shielding mask holding surface 22c.

  If it demonstrates concretely, each pin 22d is comprised by the pin which makes a tapered cylindrical shape. On the other hand, pin holes 30b are opened in the light shielding mask 30 at positions corresponding to the respective pins 22d. In the present embodiment, the diameter on the base side of each pin 22d is set so as to substantially match the opening diameter of each pin hole 30b, and each pin hole 30b is press-fitted into the base of each pin 22d, thereby blocking light. The mask 30 is held on the light shielding mask holding surface 22c. In other words, in the present embodiment, the light shielding mask 30 is supported by the plurality of pins 22d protruding from the light shielding mask holding surface 22c, so that each lens portion 22b and each light transmitting portion 30a are accurately associated with each other. In this state, it is held on the light shielding mask holding surface 22c. At this time, the disposition position of each pin 22d is set to an asymmetric position with the optical axis O as the center, so that erroneous assembly of the light shielding mask 30 is prevented accurately. As shown in FIG. 3, a clearance hole 23 a corresponding to each pin 22 d is opened on the tip surface of the spacer 23.

  According to such an embodiment, in addition to the effects obtained in the above-described embodiment, the light transmitting portion 30a that opens in the light shielding mask 30 corresponding to each lens portion 22b is formed in an arbitrary pattern shape, thereby illuminating. There is an effect that an arbitrary pattern can be formed with light.

  Next, FIGS. 5 to 7 relate to a third embodiment of the present invention, FIG. 5 is a cross-sectional view of the main part of the lighting device, FIG. 6 is an exploded perspective view of the lighting device, and FIG. It is a perspective view shown. In addition, in this embodiment, the point which mounted several LED12 on the LED board 11 as a light source differs from each above-mentioned embodiment. In addition, about the same structure, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIGS. 5 and 6, the light source unit 10 of the present embodiment is configured such that, for example, four LEDs 12 are mounted on an LED substrate 11 to constitute a main part. Each of these LEDs 12 is arranged on the LED substrate 11 at a predetermined interval, for example, with each facing the entrance surface of the fly-eye lens 22, and supplies parallel light to each lens portion 22b.

  According to such an embodiment, in addition to the effect obtained in the above-described embodiment, by mounting the plurality of LEDs 12 on the LED substrate 11, there is an effect that the amount of illumination light can be easily increased. In this case, in particular, the individual LEDs 12 are configured to generate parallel light, and the fly-eye lens 22 has a function of dispersing luminance unevenness of incident light by the action of each lens portion 22b. The LED 12 can be mounted at an arbitrary position on the LED substrate 11 in accordance with the shape, size, etc., and the amount of illumination light can be increased efficiently.

  Here, in order to improve the mounting efficiency of the LEDs 12, for example, as shown in FIG. 7, the planar view shape of the reflecting frame 14 from the optical axis O direction is formed in a regular hexagon, and the LEDs 12 are arranged in a honeycomb shape. It is also possible to face the fly-eye lens 22.

Sectional drawing of the principal part of an illuminating device in connection with the 1st Embodiment of this invention. Same as above, exploded perspective view of lighting device Sectional drawing of the principal part of an illuminating device in connection with the 2nd Embodiment of this invention. Same as above, exploded perspective view of lighting device Sectional drawing of the principal part of an illuminating device in connection with the 3rd Embodiment of this invention. Same as above, exploded perspective view of lighting device The perspective view which shows the modification of a light source unit same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Illuminating device, 10 ... Light source unit, 11 ... LED board, 12 ... Light emitting diode (reflection type light emitting diode), 14 ... Reflecting frame, 15 ... Reflecting surface, 16a, 16b ... Lead frame, 16c ... Lead wire, 17 DESCRIPTION OF SYMBOLS ... Light emitting element, 21 ... Lens optical system, 22 ... Fly eye lens, 22a ... Flange part, 22b ... Lens part, 22c ... Light shielding mask holding surface, 22d ... Pin, 30 ... Light shielding mask, 30a ... Light transmission part, 30b ... Pin hole, O ... optical axis

Claims (4)

A reflective light emitting diode having a light emitting element and a reflective surface facing the light emitting element, and generating parallel light by reflecting light emitted from the light emitting element by the reflective surface;
A fly-eye lens having a plurality of lens portions arranged in a matrix, and emitting parallel light generated by the reflection type light emitting diodes to the positions where they are incident on the respective lens portions and overlap each other; A lighting device.   The lighting device according to claim 1, wherein a plurality of the reflective light emitting diodes are opposed to the fly-eye lens. A planar view shape from the optical axis direction of the reflection frame body in which the reflection surface of each reflection type light emitting diode is recessed is formed into a regular hexagon,
3. The illumination device according to claim 2, wherein each of the reflective light emitting diodes is arranged in a honeycomb shape so as to face the fly-eye lens.   2. The light-shielding device that is interposed between the reflective light-emitting diode and the fly-eye lens and restricts light incident on each lens portion of the fly-eye lens. The lighting device according to claim 3.

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