JP2008210712A - Lighting device and lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting device capable of realizing an excellent decoration effect by projecting illumination light of desired pattern in a suitable configuration on an irradiation surface. <P>SOLUTION: The lighting device 1 has a shading mask 24 with an aperture 24a corresponding to a desired pattern opened near the front focus of a projection lens 23 installed between a collimation lens 22 to convert emitting light from an LED 12 into parallel light and the projection lens 23 which projects the light converted into parallel light by the collimation lens 22 on an irradiation surface 50. The opening shape of the aperture 24a of the shading mask 24 is corrected at least corresponding to inclination of the optical axis to the irradiation surface 50 at the time of installing the lighting device 1. Thereby, the illumination light of a desired pattern is projected on the irradiation surface 50 in a suitable configuration without distortion, and an excellent decoration effect by the illumination light is realized. At that time, it is desirable that the opening shape of the aperture 24a is corrected taking into considerations the curvature of the projection lens 23. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an illumination device and an illumination system that project illumination light having a desired pattern onto a preset irradiation surface.

  Generally, a light emitting diode (LED) has an advantage of low power consumption and long life. Moreover, since the LED can be handled as a point light source, a reflector or the like is not particularly required. Therefore, in recent years, it is expected that the LED is applied as a light source of various illumination devices as the output of the LED increases.

As this type of illumination device, for example, in Patent Document 1, a film on which a design is printed is disposed between an illumination unit using an LED as a light source and a lens barrel on which first and second convex lenses are mounted. Thus, a portable projection display device (illumination device) that projects illumination light of a desired design is disclosed.
Utility Model Registration No. 3118682

  By the way, in the case of performing product advertisement by irradiating illumination light on an irradiation surface set in a show window or a building, etc., in order to realize an excellent decoration effect by the illumination light, a desired pattern is preferably used. It is important to project with.

  An object of this invention is to provide the illuminating device and illumination system which can project the illumination light of a desired pattern on an irradiation surface with a suitable form, and can implement | achieve the outstanding decoration effect.

An illuminating device of the present invention is an illuminating device that projects an irradiation image of a desired pattern on an irradiation surface from a preset installation position, and includes a light source and an optical member that converts emitted light from the light source into parallel light. And a projection lens that projects the light converted into parallel light by the optical member onto the irradiation surface,
A light-shielding mask disposed in the vicinity of the focal point on the light source side of the projection lens and having an opening corresponding to the pattern, and at least on the irradiation image caused by the inclination of the optical axis with respect to the irradiation surface The opening shape of the opening is corrected with respect to the difference in optical path length to each position.

  In addition, the illumination system of the present invention includes a plurality of the illumination devices that project irradiation images of different designs from different installation positions on the same irradiation surface.

  According to the illuminating device of the present invention, it is possible to project a desired pattern of illuminating light on the irradiation surface in a suitable form, thereby realizing an excellent decoration effect.

  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 a schematic configuration diagram of an illumination system installed in a show window, FIG. 6 is an explanatory diagram showing an example of a pattern of illumination light projected by each illumination device, and FIG. 7 is an operation of each illumination device. It is a timing chart which shows an example of timing.

  The illuminating device shown in FIGS. 1 and 2 is, for example, an installation type illuminating device that projects an irradiation image of a desired pattern on an irradiation surface 50 (see FIG. 4) from a preset installation position. Includes a light source unit 10 using a light emitting diode (LED) 12 as a light source, and a casing 20 provided around the light source unit 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. Furthermore, a connector 13 for electrically connecting the LED 12 to the control device 110 (see FIG. 5) is fixed to the LED substrate 11. 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. Further, the LED 12 is constituted by, for example, a surface mount type LED chip in which a single convex lens is fixed to the emission plane 12a.

  The housing 20 has a cylindrical shape along the optical axis O direction of the LED 12, and houses therein a lens optical system 21 for dimming light emitted from the LED 12. In the present embodiment, the housing 20 has a substantially cylindrical shape, and an outward flange 20a is provided at the base end. The LED substrate 11 of the light source unit 10 is fixed to the outward flange 20a by screws or the like. Further, a male screw portion 20b for screwing a stopper member 34, which will be described later, is engraved on the outer periphery of the front end portion of the housing 20. Furthermore, a bracket 20c for fixing the lighting device 1 to a preset installation position is provided on the outer periphery of the middle part of the housing 20.

  The lens optical system 21 includes a collimation lens 22 as an optical member that converts light emitted from the LED 12 into parallel light, and a projection lens 23 that projects the light converted into parallel light by the collimation lens 22 onto the irradiation surface 50. Have. Further, the lens optical system 21 has a light shielding mask 24 between the collimation lens 22 and the projection lens 23.

  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 that is in sliding contact with the inner periphery of the housing 20, for example. On the incident side of the collimation lens 22, an annular spacer 30 is in contact with the flange portion 22 a, and the collimation lens 22 is disposed to face the LED 12 through the spacer 30. The collimation lens 22 converts the emitted light from the LED 12 into parallel light by setting the optical axis distance to the LED 12 to an appropriate value by the spacer 30.

  The light shielding mask 24 is made of, for example, a light shielding film having an opening 24a corresponding to a pattern of a desired irradiation image. An annular spacer 31 is in contact with the incident side edge of the light shielding mask 24, and the light shielding mask 24 is disposed opposite to the collimation lens 22 via the spacer 31. The light shielding mask 24 allows the light converted into parallel light by the collimation lens 22 to pass only through the opening 24a.

  The projection lens 23 is made of, for example, a light-transmitting resin molded product in which a biconvex lens portion 23b is integrally formed inside an annular flange portion 23a that is in sliding contact with the inner periphery of the housing 20. On the incident side of the projection lens 23, an annular spring 33 and a spacer 32 are connected to the flange portion 23a. Further, on the emission side of the projection lens 23, an annular stopper member 34 that is screwed into the male screw portion 20 b of the housing 20 is in contact with the flange portion 23 a.

  The stopper member 34 has a function of holding the series of lens optical systems 21 in the housing 20 and also functions as an adjustment mechanism for adjusting the facing state (optical axis distance) between the projection lens 23 and the light shielding mask 24. Have. Specifically, the stopper member 34 moves the projection lens 23 biased by the spring 33 forward and backward in the direction of the optical axis O by changing the screwing amount with respect to the male screw portion 20b. In the present embodiment, for example, the projection lens 23 can move back and forth in the direction of the optical axis O with reference to a position where the front focal point (incident side (LED 12 side focal point)) of the projection lens 23 coincides with the light shielding mask 24. It has become. Then, by adjusting the screwing amount of the stopper member 34, the light shielding mask 24 is disposed opposite to an appropriate position near the front focal point of the projection lens 23, so that the projection lens 23 has the shape of the opening 24 a of the light shielding mask 24. A corresponding clear irradiation image is projected on the irradiation surface 50. That is, in general, the emitted light from the LED 12 is not converted into perfect parallel light by the collimation lens 22, and a certain variation occurs. Therefore, in order to clearly project the irradiation image corresponding to the opening 24 a of the light shielding mask 24 by the projection lens 23, the optical axis distance between the projection lens 23 and the light shielding mask 24 is set to the front focal length of the projection lens 23. Is not necessarily optimal. Therefore, in the present embodiment, adjustment is made by the stopper member 34, the spring 33, and the like so that the optical axis distance between the projection lens 23 and the light shielding mask 24 can be adjusted even after the illumination device 1 is installed at a predetermined installation position. The mechanism is configured.

  As shown in FIGS. 1 to 3, a plurality of (for example, three) pin holes 24 b are formed on the edge of the light shielding mask 24 at asymmetric positions around the optical axis O. The pin 32a protruding from the spacer 31 is press-fitted into the pin hole 24b, whereby the light shielding mask 24 (opening 24a) is positioned around the optical axis O.

  Here, the opening 24a opened in the light shielding mask 24 to project the irradiation image 51 of a desired pattern on the irradiation surface 50 is in the installation state of the illumination device 1 with respect to the irradiation surface 50 with respect to the similar shape of the pattern. It has been corrected accordingly. For example, as shown in FIG. 4, the illumination device 1 is inclined obliquely downward at a predetermined depression angle θy from a predetermined installation position (X, Y, Z) with respect to an irradiation surface 50 having a width W and a height T that stands vertically. When the irradiation image 51 is projected, the optical path length of the light irradiated below the irradiation image 51 is relatively longer than the optical path length of the light irradiated upward. Therefore, in order to correct the distortion of the irradiation image due to such a difference in the optical path length, for example, the opening 24a for forming the rectangular irradiation image 51 as shown in FIG. The opening width H1 of the corresponding region is corrected so as to be relatively narrower than the opening width H2 of the region corresponding to the upper side of the irradiation image 51 (see FIG. 3). Further, in order to correct the distortion of the irradiation image 51 due to the curvature of the projection lens 23, each edge of the opening 24a is gently curved. Such a shape of the opening 24a can be obtained, for example, by tracing the behavior of each light beam constituting the irradiation image 51 on the basis of each point on the desired irradiation image 51 in a simulation. In other words, the shape of the opening 24a is reversely corrected based on the shape of the irradiation image 51 of a desired pattern in consideration of the installation state of the illumination device 1 with respect to the irradiation surface 50, for example.

  Thus, in this embodiment, between the collimation lens 22 which converts the emitted light from the LED 12 into parallel light, and the projection lens 23 which projects the light converted into parallel light by the collimation lens 22 onto the irradiation surface 50. In addition, the illumination device 1 is configured by disposing a light shielding mask 24 having an opening 24a corresponding to a desired pattern in the vicinity of the front focal point of the projection lens 23, and the opening shape of the opening 24a of the light shielding mask 24 is defined as follows. At least, the illumination light having a desired pattern is projected onto the irradiation surface 50 in a suitable form without distortion by correcting the light in association with the inclination of the optical axis with respect to the irradiation surface 50 when the illumination device 1 is installed. An excellent decorative effect by light can be realized. At that time, the irradiation image 51 can be projected in a more suitable form by correcting the opening shape of the opening 24a in consideration of the curvature of the projection lens 23.

  In addition, an adjustment mechanism for adjusting the optical axis distance between the projection lens 23 and the light-shielding mask 24 is provided in the illumination device 1, and the irradiation surface 50 is adjusted by adjusting the optical axis distance after the illumination device 1 is installed. A clear irradiation image 51 can be projected on the top.

  Next, the illumination system 100 using the above-described illumination device 1 will be described. Here, for example, the illumination system 100 shown in FIG. 5 uses a plurality of illumination devices 1 (illumination devices 101A to 101F) on a screen (irradiation surface) 150 set as a show window, and various irradiation images different from each other. 151A to 151F (see FIG. 6) are projected.

  As shown in FIG. 5, each of the lighting devices 101 </ b> A to 101 </ b> F is installed at a different position on the show window and projects various irradiation images 151 </ b> A to 151 </ b> F onto the same screen 150. For this reason, the correction amount with respect to the opening part of the light shielding mask incorporated in each illuminating device 101A-101F differs mutually.

  Here, in order to improve the appearance of the show window, each of the lighting devices 101A to 101F is preferably disposed, for example, in a frame 103 that connects the glasses 105 on each side of the show window. Here, each of the lighting devices 101A to 10aF is sufficiently reduced in size by using an LED as a light source, and can be easily accommodated in the frame 103. In the present embodiment, as shown in FIG. 5, for example, the lighting devices 1 are arranged in a line in a frame 103 disposed on the upper edge of the glass 105 in front of the show window. In addition, the luminescent color of LED used as the light source of each illuminating device 101A-101F is suitably selected according to the design etc.

  In addition, each of the lighting devices 101A to 101F is electrically connected to a control device 110 as a control unit installed outside the show window via each control line 102 routed along the frame 103. And the control apparatus 110 operates each illuminating device 101A-101F at a separate operation | movement timing, for example, as shown in FIG. 7 according to the program set beforehand.

  Thereby, the design projected on the screen 150 can be changed with time, and a suitable decoration effect can be realized. In that case, for example, as shown in FIGS. 7D, 7E, and 7F, if each irradiation image is superimposed at a predetermined timing, a more suitable decoration effect can be realized.

  Here, the light-shielding masks (designs projected by the respective lighting devices) incorporated in the respective lighting devices 101A to 101F can be appropriately replaced by detachment of the stoppers from the casing. For this reason, a plurality of operation programs for each of the lighting devices 101A to 101F are set in advance according to combinations of patterns (light-shielding masks) to be used. These operation programs are individually stored in a storage medium 111 such as a ROM, for example. Then, by appropriately replacing the storage medium 111 used in the control device 110 according to the combination of light shielding masks incorporated in each of the lighting devices 101A to 101F, suitable illumination can be realized with various variations.

  In the above-described embodiment, an example in which an LED is used as the light source of the lighting apparatus has been described. However, the present invention is not limited to this, and various other light sources can be used.

  In the above-described embodiment, an example in which the irradiation device installed at the installation position is tilted only in one axial direction with respect to the irradiation surface has been described. However, the present invention is not limited to this and is in two axial directions. It is also possible to tilt it. In this case, of course, the correction of the opening of the light shielding mask is performed corresponding to the inclination in the biaxial direction.

  Moreover, in the above-mentioned embodiment. Although an example in which the lighting system is applied to a show window has been described, the present invention is not limited to this, and can be applied to various other types of decorative lighting. In this case, the number of lighting devices used in the lighting system can be changed as appropriate.

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 example of installation of the illuminating device with respect to an irradiation surface Schematic configuration diagram of the lighting system installed in the show window Explanatory drawing which shows an example of the pattern of the illumination light which each illuminating device projects Timing chart showing an example of operation timing of each lighting device

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Illuminating device (101A-101F ... Illuminating device), 10 ... Light source unit, 11 ... LED board, 12 ... Light emitting diode (light source), 20 ... Housing, 21 ... Lens optical system, 22 ... Collimation lens (optical member) , 23 ... projection lens, 24 ... light shielding mask, 24a ... opening, 33 ... spring (adjustment mechanism), 34 ... stopper member (adjustment mechanism), 50 ... irradiation surface (150 ... screen), 51 ... irradiation image (151A- 151F ... irradiation image), 100 ... illumination system, 102 ... control line, 103 ... frame, 105 ... glass, 110 ... control device (control means), 111 ... storage medium,

Claims (4)

An illumination device that projects an irradiation image of a desired pattern on an irradiation surface from a preset installation position,
A light source;
An optical member for converting light emitted from the light source into parallel light;
A projection lens that projects the light converted into parallel light by the optical member onto the irradiation surface;
A light shielding mask disposed in the vicinity of the focal point on the light source side of the projection lens and having an opening corresponding to the pattern,
An illumination device, wherein an opening shape of the opening is corrected for at least a difference in optical path length to each position on the irradiation image due to an inclination of an optical axis with respect to the irradiation surface.   The illumination device according to claim 1, further comprising an adjustment mechanism that adjusts an optical axis distance between the projection lens and the light shielding mask.   3. An illumination system comprising a plurality of illumination devices according to claim 1 or 2, wherein projected images of different designs are projected from different installation positions on the same irradiation surface.   4. The illumination system according to claim 3, further comprising control means for operating each of the illumination devices at an individual operation timing.

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