JP2007091119A - Lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting system capable of precisely positioning each member without lowering an assembling property. <P>SOLUTION: A lens optical system 21 is constituted by interposing a first spacer 23 between a collimation lens 22 and an LED substrate 11 and interposing a second spacer 25 between the collimation lens 22 and a fly eye lens 24. A case body 20 to store the lens optical system 21 is constituted of a cylindrical case body furnished with an introversive flange 20a on its head end part. It is possible to precisely position each of the constitutional members without lowering the assembling property by inserting each of the constitutional members of the lens optical system 21 into the case body 20 through an opening part 20c on the side of a base part and holding each of the constitutional members in the case body 20 by welding them on each other with pressure between the introversive flange 20a and the LED substrate 11 of a light source unit 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an illumination device that locally illuminates a specific irradiation area, such as an in-vehicle light source such as a map lamp and a step lamp, or various types of illumination such as downlights 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. Such irradiation of light with uniform illuminance can be realized, for example, by using a lens optical system including a collimation lens and a fly-eye lens. As this type of lighting device, for example, in Patent Document 1, grooves that face each other in a pair are provided in the middle and the other end of a housing that supports a light source at one end, and each pair of grooves has a plate A technique is disclosed in which a lens optical system is supported on a casing by inserting a collimator lens portion (collimation lens) and a fly-eye lens while sliding in a plane direction. And in this illuminating device, the light emitted from the light source is converted into parallel light by a collimation lens, is incident on each lens portion of the fly-eye lens, and the light incident on each lens portion is emitted to a position where they are superimposed on each other. It is possible to generate light with uniform illuminance.
JP 2005-259653 A

  By the way, in this type of illumination device, in order to obtain illumination light with high uniformity, it is necessary to position and fix each member to the housing with high accuracy. In particular, in this type of illumination device, it is necessary to allow light with high parallelism to enter the fly-eye lens, and therefore it is necessary to strictly position the light source to the collimation lens in the optical axis direction. For example, when the above-described lens optical system is applied to a relatively small illumination device such as a step lamp mounted on a vehicle, if a collimation lens tries to obtain parallel light with a high degree of parallelism, from the light source to the collimation lens It is necessary to suppress the error of the optical axis distance within ± 5/100 mm.

  However, as in the technique disclosed in Patent Document 1 described above, in a configuration in which a collimation lens or the like is inserted while being slid into a groove in the housing, a predetermined clearance is required between each lens and each groove. Therefore, it was difficult to precisely perform positioning in the optical axis direction. To cope with this, for example, if the clearance between each lens and each groove is set as small as possible, the assemblability and the like may be reduced.

  An object of this invention is to provide the illuminating device which can position each member accurately, without degrading assembly property.

  The present invention includes a light source unit in which a light source is positioned and fixed on a substrate, a collimation lens that converts light emitted from the light source into parallel light, and a first spacer that is interposed between the substrate and the collimation lens. , A fly-eye lens in which a plurality of lens portions that respectively emit light emitted from the collimation lens and are superimposed on a specific irradiation region and arranged, and interposed between the collimation lens and the fly-eye lens A lens optical system having a second spacer, and a casing having a cylindrical shape along the optical axis direction and having a locking portion projecting inwardly at a distal end portion thereof. Each component is inserted into the casing through the opening on the base side of the casing, and the substrate of the light source unit is fixed to the base end of the casing to Closing the mouth portion, characterized in that the respective components of the lens optical system is held in the housing in mutually brought into pressure contact between the locking portion and the substrate.

  According to the illuminating device of the present invention, each member can be accurately positioned without degrading assemblability.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 4 relate to a first embodiment of the present invention. FIG. 1 is a sectional view of a main part of the lighting device, FIG. 2 is an exploded perspective view of the lighting device, and FIG. 3 is a main part showing a modification of the lighting device. FIG. 4 is an exploded perspective view showing a modification of the lighting device.

  1 and 2, reference numeral 1 indicates an illumination device suitable for, for example, a vehicle-mounted step lamp. The illuminating device 1 includes, for example, a light source unit 10 using a surface-mounted light emitting diode (LED) 12 having a single-convex lens fixed on an emission plane 12a as a light source, and a housing 20 crowned on the light source unit 10. Have.

  The light source unit 10 has an LED substrate 11 as a substrate. The LED substrate 11 has, for example, a substantially rectangular shape on a plane, and holds the LED 12 by soldering or the like at a substantially central portion thereof. Further, a connector 13 for electrically connecting the LED 12 to a power supply circuit (not shown) is fixed to the LED substrate 11. Here, the LED 12 is positioned and fixed with high accuracy at the mounting position set on the LED substrate 11 by, for example, strict machine setting of the assembling apparatus. Moreover, in order to improve the issuing efficiency of LED12, the LED board 11 is comprised, for example with the aluminum board | substrate etc. with high heat conductivity.

  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 as a locking portion protrudes from 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 collimation lens 22 having an incident surface facing the LED 12, a first spacer 23 interposed between the LED substrate 11 and the collimation lens 22, and an incident surface facing the emission surface of the collimation lens 22. And a second spacer 25 interposed between the collimation lens 22 and the fly-eye lens 24, and further interposed between the fly-eye lens 24 and the inward flange 20 a of the housing 20. And an elastic member 26.

  The collimation lens 22 is formed of a light-transmitting resin molded product in which a biconvex lens portion 22b is integrally formed inside an annular flange portion 22a whose outer periphery is in sliding contact with the inner periphery of the housing 20, for example. . Moreover, the 1st spacer 23 is comprised by the rigid resin molded product which makes the substantially cylindrical shape which an outer periphery slidably contacts with the inner periphery of the housing | casing 20, for example. The first spacer 23 has a distal end surface that contacts the flange portion 22 a on the incident side of the collimation lens 22, and a proximal end surface that contacts the front surface of the LED substrate 11, whereby the optical axis O from the LED 12 to the collimation lens 22. Define the distance in the direction. Then, when the distance in the optical axis O direction from the LED 12 to the collimation lens 22 is appropriately defined by the first spacer 23, the lens unit 22b converts the incident light from the LED 12 into parallel light with high parallelism. Then exit.

  For example, the fly-eye lens 24 is formed of a light-transmitting resin molded product in which a plurality of lens portions 24b are integrally formed in a matrix inside an annular flange portion 24a that is in sliding contact with the inner periphery of the housing 20. Yes. In addition, the second spacer 25 is formed of, for example, a hard resin molded product having a substantially cylindrical shape whose outer periphery is in sliding contact with the inner periphery of the housing 20. The second spacer 25 has a distal end surface in contact with the flange portion 24 a on the incident side of the fly-eye lens 24 and a proximal end surface in contact with the flange portion 22 a on the emission side of the collimation lens 22. Is separated from the collimation lens 22 by a predetermined distance in the direction of the optical axis O. And each lens part 24b of the fly-eye lens 24 irradiates a specific irradiation area | region uniformly by radiate | emitting the parallel light which injects from the collimation lens 22 to the position which mutually overlaps.

  The elastic member 26 is formed of, for example, a plastic resin molded product having an annular shape whose outer periphery is in sliding contact with the inner periphery of the housing 20, and the distal end surface abuts on the inward flange 20 a of the housing 20, and the proximal end surface Comes into contact with the flange portion 24a on the emission side of the fly-eye lens 24. The position where the elastic member 26 is interposed is not limited to the position between the inward flange 20a and the fly-eye lens 24, but is set between any of the constituent members between the collimation lens 22 and the inward flange 20a. It is possible.

  For example, as shown in FIG. 1, each of the structural members 22 to 26 of the lens optical system 21 includes an elastic member 26, a fly-eye lens 24, a second spacer 25, a collimation lens 22, and a first spacer 23. The housing 20 is accommodated in the housing 20 through the opening 20c on the base side. And after accommodating each structural member 22-26, the LED board 11 of the light source unit 10 is fixed to the outward flange 20b of the housing | casing 20 by screwing etc. As shown in FIG. Thereby, the opening 20c on the base side of the housing 20 is closed, and the LED 12 is set on the optical axis O of the lens optical system 21 in the housing 20. 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.

  Here, when the constituent members 22 to 25 of the lens optical system 21 excluding the elastic member 26 are arranged, the length in the optical axis O direction is the light from the base end surface of the inward flange 20a of the housing 20 to the opening 20c. It is set to be slightly shorter than the length in the axis O direction. Conversely, the total length in the optical axis O direction when all the structural members 22 to 26 of the lens optical system 21 are arranged is based on the length in the optical axis O direction from the base end surface of the inward flange 20a of the housing 20 to the opening 20c. Is set to be slightly longer. And the surplus with respect to the housing | casing 20 of the full length of the lens optical system 21 is absorbed by deformation | transformation of the elastic member 26, when the LED board 11 is fixed to the outward flange 20b. Thereby, each structural member 22-26 of the lens optical system 21 is hold | maintained in the housing | casing 20 in the state mutually press-contacted between the inward flange 20a and the LED board 11. FIG.

  According to such an embodiment, the first spacer 23 is interposed between the collimation lens 22 and the LED substrate 11, and the second spacer 25 is interposed between the collimation lens 22 and the fly-eye lens 24. The lens optical system 21 is configured, and the casing 20 that accommodates the lens optical system 21 is configured by a cylindrical casing that has an inward flange 20a at the tip, and each component of the lens optical system 21 is an inward flange. The components 20a and the LED substrate 11 of the light source unit 10 are brought into pressure contact with each other and are held in the casing 20, so that each component can be accurately positioned without degrading the assemblability.

  In particular, the distance in the optical axis O direction from the LED 12 to the collimation lens 22 can be accurately defined by pressing the first spacer 23 between the LED substrate 11 and the collimation lens 22. Therefore, the light emitted from the LED 12 can be converted into parallel light having a high degree of parallelism by the collimation lens 22, and the parallel light having a high degree of parallelism is thus incident on each lens portion 24 b of the fly-eye lens 24. Highly uniform illumination light can be realized.

  Further, since the light emitted from the LED 12 can be converted into parallel light having a high degree of parallelism by the collimation lens 22, the distance in the optical axis O direction between the collimation lens 22 and the fly-eye lens 24 is arbitrarily set. can do. Therefore, for example, even when the optical characteristics and the like of the collimation lens 22 are changed, the design change of the first spacer 23 and the like accompanying this can be easily absorbed by the design change of the second spacer 25 and the like. . That is, even when a design change or the like is made to the lens optical system 21, the change in the length in the optical axis O direction due to the design change or the like can be changed without making a major change to the housing 20 or the like. It can be easily absorbed by a small-scale modification such as a design change of the second spacer 25.

  Further, by interposing the elastic member 26 between any of the components between the collimation lens 22 and the inward flange 20a, the lens in the optical axis O direction from the LED 12 to the collimation lens 22 is maintained with high accuracy. The constituent members of the optical system 21 can be pressed against each other with an appropriate narrow pressure.

  Here, in the above-described embodiment, as a constituent member of the lens optical system 21, for example, as shown in FIGS. 3 and 4, a lens is used instead of the first spacer 23, the collimation lens 22, and the second spacer 25. You may use the collimation lens 122 in which the 1st spacer 123 and the 2nd spacer 125 were integrally formed in the part 22b.

  With this configuration, the number of parts of the lens optical system 21 can be reduced, and further assembling can be improved. In addition, since the first and second spacers 123 and 125 are integrally formed, it is possible to accurately prevent these erroneous assembly. Furthermore, by forming the first spacer 123 integrally with the lens portion 22b, the number of members divided between the LED substrate 11 and the lens portion 22b is reduced, and the optical axis O direction from the LED 12 to the lens portion 22b is reduced. The distance can be specified more strictly.

  In the lens optical system 21 described above, for example, a collimation lens is configured by a configuration in which the lens portion 22b and the first spacer 123 are integrally formed, or a configuration in which the lens portion 22b and the second spacer 125 are integrally formed. Of course, you may do.

  Next, FIGS. 5 to 9 relate to a second embodiment of the present invention, FIG. 5 is a cross-sectional view of the main part of the illuminating device, FIG. 6 is an exploded perspective view of the illuminating device, and FIG. 8 is an exploded perspective view, FIG. 8 is a plan view showing the arrangement of pins protruding from the fly-eye lens, and FIG. 9 is a cross-sectional view of the main part showing the connection between the fly-eye lens and the light-shielding mask. Note that the present embodiment is mainly different from the first embodiment described above in that the light shielding mask is integrally held on the incident side of the fly-eye lens. In addition, about the same structure, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIGS. 5 to 9, in the fly-eye lens 24, the height of the incident side flange surface of the flange 24a is relatively higher than the height of the incident side of each lens portion 24b in the optical axis O direction. Highly formed. That is, the flange surface on the incident side of the flange 24a protrudes closer to the collimation lens 22 than the top on the incident side of each lens portion 24b. The incident-side flange surface is set as a light shielding mask holding surface 24 c for holding the light shielding mask 30 integrally with the fly-eye lens 24.

  As shown in FIGS. 5 and 7, the light-shielding mask 30 is made of a light-shielding film material. On the film surface, a light-transmitting part 30a having a predetermined pattern corresponding to each lens part 24b of the fly-eye lens 24 is provided. Is open.

  Here, as shown in FIGS. 7 and 8, a plurality of (for example, three) pins 24d protrude from the light shielding mask holding surface 24c at asymmetric positions with the optical axis O as the center. 30 is held on the light shielding mask holding surface 24c through these pins 24d.

  If it demonstrates concretely, as shown to Fig.9 (a), each pin 24d is comprised by the pin which makes a tapered cylindrical shape. On the other hand, as shown in FIG. 7, pin holes 30b are opened in the light shielding mask 30 at positions corresponding to the respective pins 24d. In the present embodiment, the diameter on the base side of each pin 24d 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 24d, thereby blocking light. The mask 30 is held on the light shielding mask holding surface 24c. That is, in the present embodiment, the light shielding mask 30 is supported by the plurality of pins 24d protruding from the light shielding mask holding surface 24c, so that each lens portion 24b 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 24c. At this time, the disposition position of each pin 24d is set to an asymmetric position with the optical axis O as the center, so that erroneous assembly of the light shielding mask 30 can be prevented accurately.

  In the present embodiment, the fly-eye lens 24 is mounted on the housing 20 in order to relatively position the fly-eye lens 24 integrally holding the light-shielding mask 30 and the housing 20 around the optical axis O. The key is fitted.

  More specifically, the fly-eye lens 24 has a plurality of (for example, three) keys 24e protruding from the peripheral portion of the flange 24a. On the other hand, a key groove 20d along the optical axis O direction is formed on the inner periphery of the housing 20 at a position corresponding to each key 24e. As shown in FIGS. 6 and 7, the arrangement position of each key 24e in this case is set to an asymmetric position associated with the projecting position of each pin 24d, whereby the light shielding mask holding surface 24c is arranged. In addition, a projecting space for the pin 24d is ensured, and misassembly of the fly-eye lens 24 with respect to the housing 20 is prevented.

  As shown in FIGS. 5 and 6, in the present embodiment, similar keys 25 a protrude from the peripheral portion of the second spacer 25 at positions corresponding to the keys 24 e of the fly-eye lens 24. A clearance hole 25b corresponding to each pin 24d is opened on the end face of the second spacer 25 expanded by the key 25a.

  According to such an embodiment, in addition to the effects that can be obtained in the above-described embodiment, the height of the flange surface on the incident side of the flange 24a formed on the fly-eye lens 24 is made higher than the height on the incident side of each lens portion 24b. Is formed relatively high, and the flange surface is set as the light shielding mask holding surface 24c, so that the light shielding mask 30 is integrally held on the incident side of the fly-eye lens 24 without interfering with each lens portion 24b. There is an effect that can be. For example, an arbitrary pattern can be formed with illumination light by forming the translucent part 30a that opens in the light shielding mask 30 corresponding to each lens part 24b into an arbitrary pattern shape.

  In this case, a plurality of pins 24d are projected at asymmetric positions around the optical axis O on the light-shielding mask holding surface 24c, and the light-shielding mask 30 is supported by the pins 24d so that each lens portion 24b is supported. The light shielding mask 30 can be held on the light shielding mask holding surface 24c in a state where the light transmitting portions 30a are accurately associated with each other.

  Here, as a configuration for holding the light shielding mask 30 by each pin 24d, instead of the above-described configuration in which the base portion of each pin 24d is press-fitted into each corresponding pin hole 30b, for example, as shown in FIG. The light shielding mask 30 may be held by engaging the pin hole 30b with the engagement step portion by forming an engagement step portion with a small diameter at the base portion of the pin 24d. Good. Further, for example, as shown in FIG. 9C, the light shielding mask 30 may be held by thermally crushing the pins 24d with the pins 24d penetrating the pin holes 30b.

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 Same as above, main part sectional view showing a modification of the lighting device As above, an exploded perspective view showing a modification of the 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 Same as above, exploded perspective view of light shielding mask from fly-eye lens As above, a plan view showing the arrangement of pins protruding from the fly-eye lens Same as above, main part sectional view showing the connection part between the fly-eye lens and the light shielding mask

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Illuminating device, 10 ... Light source unit, 11 ... LED board (board | substrate), 12 ... Light emitting diode (light source), 20 ... Case, 20a ... Inward flange (locking part), 21 ... Lens optical system, 22 ... Collimation Lens, 23 ... first spacer, 24 ... fly eye lens, 24a ... flange portion, 24b ... lens portion, 24c ... light shielding mask holding surface, 24d ... pin, 25 ... second spacer, 26 ... elastic member, 30 ... Shading mask, 30a ... translucent portion, 30b ... pin hole, 122 ... collimation lens, 123 ... first spacer, 125 ... second spacer, O ... optical axis

Claims (5)

A light source unit in which a light source is positioned and fixed on a substrate;
A collimation lens that converts light emitted from the light source into parallel light, a first spacer that is interposed between the substrate and the collimation lens, and a specific irradiation region that receives light emitted from the collimation lens. A lens optical system having a fly-eye lens in which a plurality of lens portions that are superimposed on each other and arranged, and a second spacer interposed between the collimation lens and the fly-eye lens,
A cylindrical shape along the optical axis direction, and a housing having a locking portion projecting inwardly at the tip, and
Each component of the lens optical system is inserted into the casing through an opening on the base side of the casing, and the base of the casing is fixed to the base end portion of the casing. The illumination device is characterized in that the opening on the side is closed, and the constituent members of the lens optical system are held in the casing while being pressed against each other between the locking portion and the substrate. The fly-eye lens is a lens member in which the plurality of lens portions are integrally formed inside an annular flange whose outer periphery is in sliding contact with the inner periphery of the housing,
The height of the flange surface on the incident side of the flange is formed relatively higher than the height of each lens part, and the flange surface is set as a light shielding mask holding surface,
The illumination device according to claim 1, wherein a light shielding mask in which light transmitting portions corresponding to the respective lens portions of the fly-eye lens are opened is held on the light shielding mask holding surface. Protruding a plurality of pins at asymmetric positions around the optical axis on the light shielding mask holding surface, and opening pin holes corresponding to the pins on the light shielding mask,
The lighting device according to claim 2, wherein the light shielding mask is held on the light shielding mask holding surface by penetrating each pin with respect to each pin hole. Each pin has a tapered columnar shape in which the diameter on the base side substantially matches the diameter of the pin hole,
The lighting device according to claim 3, wherein each pin holds the light-shielding mask when a base portion is press-fitted into each pin hole. Each of the pins has an engaging step portion that engages with the pin hole on the base side,
5. The lighting device according to claim 3, wherein each pin holds the light-shielding mask by engaging each pin hole with the engagement step portion. 6.

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