JP2007265687A - Lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting fixture capable of irradiating illumination light of high output and high uniformity without causing damage to an optical member. <P>SOLUTION: By arranging an infrared-cutting filter 13 on a light path of irradiation light from an HID lamp 12, heated light is prevented from entering from a light source unit 10 to a lens optical system unit 20. With this, heat damage due to overheating of the optical member is prevented even if an optical member like a light-shielding plate 22 for shielding unnecessary light is installed on the light path of the lens optical system unit 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an illumination device having a bulb such as an HID lamp (High Intensity Discharge Lamp) or a halogen lamp as a light source.

  Conventionally, as an illuminating device, for example, as disclosed in Patent Document 1, light emitted from a light source is converted into parallel light using a collimation lens, and each cell lens (lens unit) of a fly-eye lens is converted. ) And irradiating a specific irradiation region with uniform illuminance by superimposing light emitted from each cell lens on each other.

  By the way, in order to form illumination light with high uniformity, it is important to generate light with high parallelism by a collimation lens or the like. Therefore, this type of technology is preferably applied particularly to an illumination device using a light emitting diode (LED) that can handle the light emitting unit as a sufficiently small point light source.

On the other hand, for example, when a large amount of light is required for illumination light such as an outdoor illumination device, various bulb light sources such as an HID lamp and a halogen lamp are used as the light source of the illumination device. There is a case. In this case, since it is difficult to handle the bulb light source as a sufficiently small point light source, in order to obtain illumination light with a high degree of uniformity using the bulb light source, for example, a light shielding member is not provided in the lens optical system. It is necessary to take measures such as cutting light.
JP 2005-259653 A

  However, since light supplied from various bulb light sources such as HID lamps and halogen lamps generally has a large amount of heat, if an optical member such as a light shielding member is disposed on the optical path of the lens optical system, the optical member is overheated. There was a risk of thermal deformation.

  An object of this invention is to provide the illuminating device which can irradiate illumination light with high output and high uniformity, without damaging an optical member.

  According to the present invention, a light source unit having a bulb light source, a filter disposed on an optical path of light emitted from the bulb light source and restricting transmission of light having a long wavelength, and a plurality of lens units are arranged in a matrix. And a lens optical system unit that includes a fly-eye lens, and transmits the light transmitted from the filter at each lens portion of the fly-eye lens and emits the light to a position where they overlap each other.

  According to the illumination device of the present invention, it is possible to irradiate illumination light with high output and high uniformity without damaging the optical member.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3 relate to a first embodiment of the present invention, FIG. 1 is an exploded perspective view of the illumination device, FIG. 2 is a cross-sectional view of the main part of the illumination device, and FIG. 3A is a light distribution pattern of illumination light. (B) is a chart showing the illuminance distribution of illumination light.

  The illuminating device 1 shown in FIGS. 1 and 2 is an illuminating device that can emit illumination light having a relatively high output, and is suitably used for outdoor lighting such as a store. The lighting device 1 includes, for example, a light source unit 10 that uses a high intensity discharge lamp (hereinafter referred to as an HID lamp) 12 that is a high-power bulb light source as a light source, and the light source unit 10 is crowned. Lens optical system unit 20.

  The light source unit 10 includes a reflector 11. In the present embodiment, the reflector 11 is an elliptical reflector in which the reflecting concave surface 11a forms a part of a spheroid. For this reason, the reflector 11 has two focal points including the first focal point F1 and the second focal point F2 as optical axes. Have on. The reflector 11 has a valve insertion hole 11b at the base of the reflective concave surface 11a. An HID lamp 12 is inserted into the bulb insertion hole 11b, and the HID lamp 12 is held by the reflector 11 with the light emitting portion 12a positioned at the first focal point F1. Thereby, the light emitted from the light emitting portion 12a of the HID lamp 12 and reflected by the reflecting concave surface 11a is condensed at the second focal point F2.

  Here, for example, the reflector 11 transmits long-wavelength light such as infrared rays (for example, so-called heat light having a wavelength of *** or more) and reflects light having a shorter wavelength (so-called cold light). The so-called cold reflector is used.

  Further, the light source unit 10 is, for example, an IR cut filter (infrared cut filter) 13 as a filter that restricts the transmission of the long wavelength light and allows the transmission of the short wavelength light on the outgoing optical path of the HID lamp 12. Have The IR cut filter 13 is disposed at the emission port 11 c of the reflector 11 and is housed in the housing 14 integrally with the reflector 11. The casing 14 is provided with a blower device 15, and the IR cut filter 12 is cooled together with the reflector 11 by cooling air supplied from the blower device 15 to the reflector 11.

  The lens optical system unit 20 includes a lens housing 21, a light shielding plate 22 accommodated and held in the lens housing 21, a collimation lens 23, and a pair of fly-eye lenses (first and second fly-eye lenses 24, 25).

  As shown in FIG. 1, in the present embodiment, the lens housing 21 has a substantially rectangular tube shape, and an incident 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 31 is opened at a position facing the entrance 30. As shown in FIG. 2, when the lens housing 21 is crowned on the light source unit 10, the lens housing 21 has a reflective concave surface 11 a facing through the entrance 30, and on the optical axis in the lens housing 21. The second focal point F2 of the reflector 11 is located at

  The lens housing 21 has a lens insertion opening 33 that opens to one side, and the light shielding plate holding grooves 35 that face each other in order from the incident opening 30 side on the inner surface of each side wall adjacent to the lens insertion opening 33. A collimation lens holding groove 36, a first fly eye lens holding groove 37, and a second fly eye lens holding groove 38.

  The light shielding plate 22 is constituted by, for example, a flat plate member having a substantially rectangular shape that is inserted and held in the light shielding plate holding groove 35. Here, the light shielding plate holding groove 35 is set corresponding to the position of the second focal point F2 in the lens housing 21. As a result, the light shielding plate 22 is disposed opposite to the reflector 11 at a position on the optical axis that coincides with the second focal point F2, and a light shielding surface perpendicular to the optical axis is formed in the lens housing 21. Furthermore, a pinhole 22a is opened in the light shielding plate 22 at a position coinciding with the second focal point F2. Thereby, the light-shielding plate 22 allows only the light condensed at the second focal point F2 to pass to the exit 31 side, and shields other light.

  The collimation lens 23 is, for example, a lens member in which a lens portion 23b is integrally formed on the exit side of a substantially rectangular planar lens substrate 23a inserted and held in the collimation lens holding groove 37. And the collimation lens 23 injects the light which passed through the pinhole 22a, converts it into substantially parallel light with the lens part 23b, and radiate | emits it. Needless to say, the collimation lens 23 may be constituted by a biconvex lens in which lens portions are integrally formed on the exit side and the entrance side of the lens substrate 23a.

  The first fly-eye lens 24 includes, for example, an incident surface projecting downward and an exit surface projecting upward on a planar substantially rectangular lens substrate 24a inserted and held in the first fly-eye lens retaining groove 37. Is a lens member in which a plurality of (for example, 5 × 5) lens portions 24b are integrally formed in a matrix.

  Similarly, for example, the second fly-eye lens 25 protrudes upward and protrudes downward on a planar substantially rectangular lens substrate 25a inserted and held in the second fly-eye lens holding groove 38. A lens member in which a plurality of (for example, 5 × 5) lens portions 25b having an emission surface are integrally formed in a matrix.

  Here, as shown in FIG. 2, the lens portions 24a and 25a of the first and second fly-eye lenses 24 and 25 are directly opposed in a one-to-one correspondence. The relative distance in the optical axis direction of the first and second fly-eye lenses 24 and 25 is the distance that the parallel light incident on the incident surface of the lens portion 24a is collected on the corresponding exit surface of the lens portion 25b. Is set to And the light condensed on the emission surface of each lens part 25b is emitted to a position where they overlap each other, thereby forming a light beam that irradiates a specific irradiation area A (see FIG. 3) with uniform illuminance.

  In the figure, reference numeral 40 denotes a side plate. The side plate 40 has a lens insertion opening after the light shielding plate 22, the collimation lens 23, and the first and second fly-eye lenses 24 and 25 are accommodated in the lens housing 21. 33 is closed.

  According to such an embodiment, the light emitted from the HID lamp 12 is reflected by the reflector 11 and is incident on the collimation lens 23 in a state having a predetermined directivity, so that a light emitting unit is formed like the HID lamp 12. Even when it is difficult to handle 12a as a point light source, the collimation lens 23 can generate parallel light with high parallelism. Then, by making such parallel light enter the fly-eye lenses 24 and 25, it is possible to obtain illumination light with high output and high uniformity.

  In this case, in particular, the reflector 11 is composed of an elliptical reflector, the light emitting part 12a of the HID lamp 12 is arranged at the first focal point F1 set to the elliptical reflector, and the reflected light is condensed at the second focal point F2, and By disposing the light shielding plate 22 with the pinhole 22a opened at a position coincident with the two focal points, unnecessary light can be prevented from entering the collimation lens 23 accurately, and parallel light with higher parallelism can be obtained. Can be generated. Then, by making parallel light having a high degree of parallelism incident on the fly-eye lenses 24 and 25 in this way, it is possible to irradiate a desired irradiation area A with high uniformity as shown in FIG.

  At this time, the IR cut filter 13 is disposed on the light source unit 10 side, and by restricting the incidence of heat light on the lens optical system unit 20 side, an optical member such as a light shielding plate 22 is provided in the lens optical system unit 20. Heat damage due to overheating can be prevented.

  In addition, by configuring the reflector 11 that reflects the light emitted from the HID lamp 12 with a cold reflector, it is possible to more effectively limit the incidence of heat light on the lens optical system unit 20 side, and the lens optical system. The heat damage in the unit 20 can be suppressed more effectively.

  Further, by disposing the IR cut filter 13 on the light source unit 10 side, the optical members heated by the light supplied from the HID lamp 12 can be concentrated in the light source unit 10, and these can be connected to the blower device 15 or the like. It can be used and cooled in a batch.

  Further, by forming a luminous flux with uniform illuminance by combining the first and second fly-eye lenses 24 and 25, the thickness of each fly-eye lens can be reduced, and the lighting device 1 can be reduced in weight. be able to.

  Next, FIGS. 4 to 9 relate to a second embodiment of the present invention, FIG. 4 is an exploded perspective view of the illumination device, FIG. 5 is a cross-sectional view of a main part of the illumination device, and FIG. FIG. 7A is a contour diagram showing a light distribution pattern of illumination light, and FIG. 7B is a chart showing an illuminance distribution of illumination light. In the present embodiment, a point that a light shielding means for limiting light incident on each lens portion 24a is interposed between the collimation lens 23 and the first fly-eye lens 24 is different from the above-described first embodiment. . In addition, about the same structure, a same sign is attached | subjected and description is abbreviate | omitted.

  As shown in FIGS. 4 and 5, in the illumination device 1 of the present embodiment, the light shielding mask holding groove 45 is provided in the lens housing 21 between the collimation lens holding groove 36 and the first fly-eye lens holding groove 37. The light shielding mask 46 as a light shielding means is held in the light shielding mask holding groove 45.

  The light shielding mask 46 includes, for example, a light-transmitting substrate 46a having a substantially rectangular shape inserted and held in the light-shielding mask holding groove 45, and a light shielding portion (light shielding film) 46b formed on the light transmitting substrate 46a. The light-shielding mask 46 is opposed to the incident surface of the first fly-eye lens 24 in the vicinity, and the light-shielding portion 46b transmits light at positions corresponding to the lens portions 24b of the first fly-eye lens 24, respectively. The part 46c is opened. That is, the light shielding unit 46b limits the light incident on the lens units 24b of the first fly-eye lens 24 from the collimation lens 23 by defining the light transmission unit 46c on the light transmission substrate 46a.

  Here, in order to prevent thermal deformation of the light-shielding film 46b accurately, as shown in FIG. 5, another light-transmitting substrate 46d is bonded to the light-transmitting substrate 46a, and both the light-transmitting substrates 46a and 46d are bonded. It is desirable to sandwich the light shielding film 46b between them. Furthermore, in order to prevent heat absorption at the time of light shielding, the light shielding part 46b is desirably formed of a vapor deposition film such as metal.

  In the present embodiment, for example, as shown in FIG. 6, each light transmission portion 46 c is opened in an arrow pattern, and thus the illumination device 1 irradiates the irradiation area A ′ in the arrow pattern with a uniform illuminance ( (See FIG. 7).

  According to such an embodiment, when the illumination device 1 is used, for example, at a storefront or the like by limiting the incidence of light to each lens unit 24a using the light shielding mask 46 and forming a pattern with the irradiated image. There is an effect that the functionality can be improved.

  Here, each light transmitting portion 46c opening to the light shielding portion 46b facing each lens portion 24b of the first fly-eye lens 24 has a fine pattern, and thus is particularly susceptible to thermal damage from the light source. Since the incidence of heat light from the light source unit 10 is limited, it is possible to accurately prevent heat damage to the light shielding portion 46b and the like. At that time, the light shielding part 46b is sandwiched between the light-transmitting substrates 46a and 46d, so that a heat damage countermeasure can be applied to the light shielding mask 46 itself. Furthermore, by forming the light shielding part 46b with a vapor deposition film of metal or the like, it is possible to take more effective measures against heat damage to the light shielding mask 46.

  In each of the above-described embodiments, the fly-eye lens is divided and configured by the first and second fly-eye lenses 24 and 25 formed thin in order to reduce the weight of the lighting device 1. It is also possible to replace the fly-eye lenses 24 and 25 with a single fly-eye lens. In this case, it is desirable that the fly-eye lens has optical characteristics of each lens unit so that incident parallel light is condensed on its exit surface.

  In each of the above-described embodiments, each of the lens portions 24a and 25a of the first and second fly-eye lenses 24 and 25 is a biconvex lens. For example, the first fly-eye lens 24 is used. Each lens portion 24a is composed of a one-convex lens portion having a lens curved surface formed only on the incident surface side, and the lens curved surface is formed on the lens portion 25b of the second fly-eye lens 25 as viewed on the exit surface side. It is also possible to configure with a single convex lens part.

  Of course, the light source bulb applicable to the present invention is not limited to the HID lamp.

FIG. 1 is an exploded perspective view of a lighting device according to a first embodiment of the present invention. Same as above, FIG. 2 is a sectional view of the main part of the lighting device. Same as the above, (a) is a contour map showing the light distribution pattern of the illumination light, and (b) is a chart showing the illuminance distribution of the illumination light. An exploded perspective view of a lighting device according to a second embodiment of the present invention. Same as above, main part sectional view of the lighting device Same as above, top view of shading mask Same as the above, (a) is a contour map showing the light distribution pattern of the illumination light, and (b) is a chart showing the illuminance distribution of the illumination light.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Illuminating device, 10 ... Light source unit, 11 ... Reflector, 11a ... Reflective concave surface, 12 ... High-intensity discharge lamp (light source bulb), 12a ... Light emission part, 13 ... Infrared cut filter (filter), 20 ... Lens optical system unit 22 ... light shielding plate, 22a ... pinhole, 23 ... collimation lens, 24 ... first fly eye lens (fly eye lens), 24b ... lens part, 25 ... second fly eye lens (fly eye lens), 25b ... lens part, 25c ... hole (lens moving means), 25d ... screw hole (lens moving means) 46 ... light shielding mask (light shielding means)

Claims (4)

A light source unit comprising: a bulb light source; and a filter disposed on an optical path of light emitted from the bulb light source to limit transmission of light having a long wavelength;
A lens optical system unit having a fly-eye lens in which a plurality of lens units are arranged in a matrix, and transmitting light from the filter that is incident on each lens unit of the fly-eye lens and exits to a position where they overlap each other A lighting device characterized by that.   2. The illumination according to claim 1, wherein the light source unit includes a reflector that transmits long-wavelength light emitted from the bulb light source and reflects the short-wavelength light on a reflective concave surface to be incident on the filter. apparatus. In the reflector, a light emitting portion of the light source bulb is disposed at a first focal point, and a second focal point set in the lens optical system by reflecting short wavelength light emitted from the light emitting unit by the reflecting concave surface. An elliptical reflector that focuses light on
The lens optical system unit includes: a light shielding plate having a pinhole opened at a position coinciding with the second focal point;
The illumination apparatus according to claim 2, further comprising: a collimation lens that converts light that has passed through the pinhole into parallel light and enters the flyeye lens.   4. The illumination device according to claim 1, wherein the lens optical system includes a light shielding unit that restricts light incident on each lens unit of the fly-eye lens. 5.

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