JP2013134912A - Lighting device for high-speed photographing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device for high-speed photographing, the device capable of being miniaturized, weight-saved, and restraining chromatic aberration.SOLUTION: A lighting device for high-speed photographing 1 includes light-emitting elements 9 and a control member for controlling emission light of the light-emitting elements 9 for illuminating with light controlled by the control member during high-speed photographing, wherein the control member is constituted of reflecting mirrors 5.

Description

  The present invention relates to a high-speed photographing illumination device including a light emitting element.

2. Description of the Related Art Conventionally, in a lighting device for high-speed photography, for example, a lighting device in a vehicle collision test site, a high intensity discharge (HID) lamp such as a metal halide lamp that can easily increase the output is used as a light source (see, for example, Patent Document 1). ).
In recent years, lighting devices for high-speed photography using LEDs as light sources have been proposed for the purpose of extending the life. In this illuminating device, the light distribution of the light from the radiation surface of the LED is controlled by a configuration in which a lens is disposed on the radiation surface.

Japanese Patent No. 4439376

However, during high-speed shooting, as the shutter speed increases (the number of frames per second increases), the amount of light required for shooting increases, so a high-power illumination device is required. If the output is simply increased using a lamp, there is a problem in that the inside of the lighting device becomes high temperature and the lamp and the periphery of the lamp are damaged by heat. In addition, although the total amount of light can be increased by increasing the number of low-output lighting devices, there is a problem that when the number of lighting devices increases, the overall weight of the device increases and the cost also increases.
Further, when an LED is used as a light source and a lens is used for light distribution control, chromatic aberration occurs on the irradiated surface.
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a high-speed photographing illumination device that can be reduced in size and weight and can suppress chromatic aberration.

  In order to achieve the above object, the present invention comprises a light emitting element and a control member for controlling the emitted light of the light emitting element, and illuminates with light controlled by the control member during high speed photographing. In the illumination device, the control member is constituted by a reflecting mirror.

  The said structure WHEREIN: You may provide the fan which supports the said light emitting element on the heat conductive board which has high heat conductivity, and blows toward the back surface of the said heat conductive board.

  The said structure WHEREIN: You may form a some fin along the ventilation direction in the back surface of the said heat conductive board.

  The said structure WHEREIN: You may arrange | position the control apparatus which controls lighting of the said light emitting element in the air path of the said fan substantially parallel to an air path.

  According to the present invention, since the control member is constituted by the reflecting mirror, the apparatus can be miniaturized, the apparatus can be significantly reduced in weight, and chromatic aberration can be suppressed.

It is a front view which shows the illuminating device (illuminating device for high-speed imaging | photography) which concerns on embodiment of this invention. It is a figure which shows an illuminating device, (A) is the top view, (B) is the back view, (C) is the bottom view, (D) is the left side view, (E) is the right side view. is there. It is a front perspective view which shows an illuminating device. It is a figure which shows the structure of a light source unit. It is a figure which shows the structure of a reflection unit, (A) is the front view, (B) is the side view, (C) is the top view. It is a figure which shows a parabolic reflection surface. It is a back perspective view which shows an illuminating device. It is a right view which shows an illuminating device. It is a top view which shows an illuminating device. It is a top view which shows an illuminating device. It is a back perspective view which shows the illuminating device which concerns on the modification of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a front view showing a lighting device (high-speed shooting lighting device) according to the present embodiment. 2A and 2B are diagrams illustrating the lighting device, in which FIG. 2A is a plan view thereof, FIG. 2B is a rear view thereof, FIG. 2C is a bottom view thereof, and FIG. FIG. 2E is a right side view. FIG. 3 is a front perspective view showing the lighting device.
The illuminating device 1 is a device suitable for high-speed shooting using a high-speed shooting camera, for example, at a vehicle collision test site or the like, and includes a light source unit 3 (FIG. 4), a reflection unit (reflecting mirror) 5, , A cooling unit 20, a power supply device (control device) 40, and a lamp case 7 in which these are housed. In FIG. 3, the upper plate 7B (FIG. 2) of the lamp case 7 is omitted.

The light source unit 3 is configured by arranging a plurality (five in the illustrated example) of LEDs (light emitting elements) 9 as a light source in a line. The light source unit 3 may be configured to use a light emitting element such as an organic EL as a light source in addition to the LED 9. In addition, the reflecting unit 5 is provided with a parabolic reflecting surface 11 corresponding to each LED 9. And the radiated light of LED9 is collimated by each parabolic reflecting surface 11, and is radiate | emitted.
Hereinafter, each part will be described in more detail.

FIG. 4 is a diagram showing a configuration of the light source unit 3.
The light source unit 3 is configured by arranging three, two, and a total of five LEDs 9 in a row at a constant pitch P (detailed later) on two insulating plates 13A and 13B extending in the horizontal direction. The LED 9 is configured by packaging a plurality of LED elements (LED chips) (not shown) into one. In the present embodiment, the light source unit 3 having an output of about 200 W (watt) is configured by using five LEDs 9 having an output of about 40 W (watt). The insulating plate 13A and the three LEDs 9 arranged on the insulating plate 13A constitute a light source unit 3A, and the insulating plate 13B and the two LEDs 9 arranged on the insulating plate 13B constitute a light source unit 3B. These light source units 3 </ b> A and 3 </ b> B are attached to the heat conduction plate 21 of the cooling unit 20. The wiring (not shown) of the light source units 3A and 3B is drawn between the light source units 3A and 3B of the heat conducting plate 21 and through the through holes 21A formed on the array of LEDs 9 to the back side of the heat conducting plate 21. It has been turned.

5A and 5B are diagrams showing the configuration of the reflection unit 5, FIG. 5A is a front view thereof, FIG. 5B is a side view thereof, and FIG. 5C is a plan view thereof. FIG. 6 is a diagram showing the parabolic reflecting surface 11.
The reflection unit 5 is configured such that a parabolic reflection surface 11 is provided side by side on the unit main body 30 in accordance with the pitch P of the LEDs 9, and the reflection unit 5A includes three parabolic reflection surfaces 11 arranged in a row. And a reflection unit 5B in which two parabolic reflection surfaces 11 are arranged in a line. The reflection units 5A and 5B have substantially the same configuration except for the number of parabolic reflection surfaces 11, and therefore the same portions are denoted by the same reference numerals.

As shown in FIG. 5B, the unit main body 30 has a substantially parabolic shape in side view along the parabolic reflection surface 11, and the bottom 31 of the unit main body 30 is a light source as shown in FIG. It arrange | positions so that it may be located on the insulating plates 13A and 13B of the units 3A and 3B. The unit body 30 includes a connecting portion 32 that connects the parabolic shapes, and the connecting portion 32 is provided with a fixed piece 32A that extends vertically. The unit main body 30 is supported by the heat conducting plate 21 by fixing the fixing pieces 32 </ b> A to the reflection unit fixing portion 15 provided on the heat conducting plate 21 with screws.
Further, as shown in FIG. 5, the reflecting units 5A and 5B are divided into parabolic reflecting surface units 30A formed by dividing the parabolic reflecting surfaces 11 so as to have the same shape on the surfaces passing through the major axis K of the parabolic reflecting surfaces 11, respectively. 30B, and these are fastened with screws. In addition, since the divided parabolic reflecting surface unit 30B has substantially the same configuration as the divided parabolic reflecting surface unit 30A, the same portions are denoted by the same reference numerals, and description thereof is omitted.

  The divided parabolic reflecting surface unit 30A is formed by casting from a material having high thermal conductivity such as aluminum, for example, and has a surface exposing the parabolic reflecting surface 11 that is vertically divided along the long axis K. This surface is subjected to aluminum vapor deposition for increasing the reflectance of the parabolic reflecting surface 11 after casting, and then the reflecting unit 5 is configured by joining the divided parabolic reflecting surface units 30A and 30B. According to this configuration, even when the parabolic reflecting surface 11 is deep, the aluminum vapor deposition film can be uniformly formed on the entire surface, and an efficient reflecting mirror can be easily obtained.

As shown in FIG. 6, the parabolic reflecting surface 11 of the reflecting unit 5 is a concave mirror having a reflecting surface as a parabolic surface, and a bottom end 31 is provided with a starting end opening 33 facing the LED 9 (FIG. 5). The emitted light emitted from the LED 9 facing the parabolic reflecting surface 11 from the start end opening 33 is converted into parallel light and emitted from the end opening 35. By collimating and emitting, it is possible to suppress the spread to the irradiation field and prevent the illuminance from decreasing.
Furthermore, in the present embodiment, in order to increase the axial luminous intensity at each parabolic reflecting surface 11, the shape of each parabolic reflecting surface 11 is as follows.

  That is, the parabolic reflecting surface 11 has a diameter D2 of the starting end opening 33 of the parabolic reflecting surface 11 as large as the width W (FIG. 4) of the LED 9 and an axis from the starting end opening 33 to the terminal opening 35. The length L is a length at which an ultra-small angle light distribution can be obtained, and the diameter D1 of the terminal opening 35 is formed to be a length at which the 1/2 beam angle is 10 to 15 degrees. Here, in the present embodiment, the super narrow-angle light distribution is a light distribution with a 1/2 beam angle of 10 to 15 degrees.

  As a result, the diameter D1 that is the opening of the terminal opening 35 of the parabolic reflecting surface 11 has a very small shape with respect to the axial length L, and the cut-off angle θ (FIG. 6) is also small. Parallel rays can be collected on the long axis K of the parabolic reflecting surface 11 as compared with the conventional one, and the axial luminous intensity can be improved. Further, since the 1/2 beam angle is as small as 10 to 15 degrees, the spread of the irradiation field is suppressed and the illuminance is increased.

In the reflection unit 5, as described above, the total output is increased by irradiating light from each of the plurality of parabolic reflection surfaces 11. At this time, if each light of the parabolic reflecting surface 11 is separated in the irradiation field, a desired illuminance cannot be obtained in the irradiation field. Therefore, the pitch P of the parabolic reflecting surfaces 11 (LEDs 9) is set so that each radiated light has an overlap in a predetermined irradiation field in consideration of the spread of light emitted from each parabolic reflecting surface 11. Yes. Thereby, the axial luminous intensity of the illuminating device 1 provided with the light source unit 3 and the reflection unit 5 is raised, and sufficient illumination intensity can be maintained.
At this time, by making the major axes K of the parabolic reflecting surfaces 11 parallel to each other, high axial luminous intensity can be maintained without condensing light in an irradiation field separated by a predetermined distance. Thus, the illuminating device 1 of this Embodiment is excellent in uniformity, and can be reduced in size and weight.

2 and 3, the lamp case 7 includes a rear plate 7A, an upper plate 7B, a bottom plate 7C, a left side plate 7D, and a right side plate 7E, and is configured in a box shape that is horizontally long when viewed from the front. For example, an aluminum alloy. A light resin transparent cover (front cover) 17 such as acrylic is provided on the front surface of the lamp case 7. A support arm 19 for attachment to the gantry is provided on the bottom plate 7C of the lamp case 7.
The rear plate 7A of the lamp case 7 is provided with a connection box 51 at a substantially central portion. In the connection box 51, although not shown, the commercial power line and the power line of the lighting device 1 extending from the power supply device 40 are connected, and the commercial power is supplied to the lighting device 1.

Next, the cooling unit 20 will be described in detail.
FIG. 7 is a rear perspective view showing the lighting device 1, FIG. 8 is a right side view showing the lighting device 1, and FIGS. 9 and 10 are plan views showing the lighting device 1. 7, 9, and 10, the upper plate 7 </ b> B of the lamp case 7 is omitted, and the right plate 7 </ b> E of the lamp case 7 is omitted in FIG. 8. Further, the substrate 41 is omitted in FIG. 9, and the substrate 41 and the heat sink 47 are omitted in FIG.
The heat conduction plate 21 is disposed substantially parallel to the rear plate 7A of the lamp case 7 with a space from the rear plate 7A. The heat conductive plate 21 is formed of a light material (for example, aluminum material) having high heat conductivity, and includes a plurality of fins 21 </ b> C extending along the arrangement direction of the LEDs 9 on the back surface 21 </ b> B. The fins 21 </ b> C are provided over the length direction of the heat conduction plate 21 (the left-right direction of the lamp case 7), and the back surface 21 </ b> B side of the heat conduction plate 21 has a large surface area due to these fins 21 </ b> C.

  Openings 23A and 23B (FIG. 2) are formed in the left side plate 7D and the right side plate 7E of the lamp case 7 at positions corresponding to the space between the rear plate 7A and the heat conduction plate 21, and the left side plate 7D and the right side plate 7E. A fan 23 is attached to the plate 7E so as to face the openings 23A and 23B. The openings 23A and 23B are provided with a fan guard 24A in which a plurality of elongated holes are formed, and a dustproof filter 24B that prevents dust and dust from entering the air passage 25. A plurality of holes may be formed directly on the side plate of the lamp case 7 instead of the dedicated fan guard 24A. Moreover, although the capability of the two fans 23 is made the same, one capability may be made larger than the other capability. By driving these fans 23, air flows from one opening (for example, the opening 23A) to the other opening (for example, the opening 23B), and the space between the heat conductive plate 21 and the rear plate 7A becomes the air path 25. Become. That is, the heat conducting plate 21 functions as a partition member that partitions the lamp case 7 into the air passage 25 and the housing portion 53 that houses the reflection unit 5 and the light source unit 3.

  As described above, the air passage 25 of the fan 23 is formed on the back surface 21B side of the heat conducting plate 21 and the fins 21C are formed on the back surface 21B of the heat conducting plate 21 so that the back surface 21B of the heat conducting plate 21 is formed. Since wind can be flown along and the heat conductive plate 21 can be air-cooled, the heat of the light source unit 3 can be efficiently radiated. For example, when not forcibly cooled by a fan, the heat conduction plate 21 needs to be formed relatively large so as to have a heat capacity that can sufficiently dissipate the heat of the light source unit 3, but according to the present embodiment, By the said structure, the heat conductive board 21 can be made small and the illuminating device 1 can be reduced in size and weight.

As shown in FIG. 8, the air passage 25 houses a power supply device 40 including a substrate 41 on which a lighting circuit for the LED 9 is mounted. The substrate 41 is disposed substantially parallel to the rear plate 7A of the lamp case 7 and at a position separated from the rear plate 7A by a predetermined insulation distance or more, so that the cool air of the fan 23 flows also in the back space of the substrate 41. It has become.
The substrate 41 is fixed to the substrate fixing base 43 attached on the bottom plate 7C of the lamp case 7 with screws. The substrate fixing base 43 is formed of, for example, an aluminum alloy having high thermal conductivity, and is formed integrally by bending the flat plate portion 43A and both ends of the flat plate portion 43A, and supports the flat plate portion 43A at a position separated from the bottom plate 7C. It has a substantially L-shaped leg 43B. A space between the bottom plate 7 </ b> C and the substrate fixing base 43 communicates with the air passage 25, and the air flows through the cavity 45.

  As shown in FIGS. 8 and 9, a heat radiating plate 47 made of a metal material having high thermal conductivity such as an aluminum alloy is provided on the flat plate portion 43 </ b> A. The substrate 41 and the heat radiating plate 47 are connected in a substantially L shape by being fixed with screws or the like before being housed in the lamp case 7. Of the circuit components constituting the lighting circuit of the LED 9, the heat generating component 49 having relatively large heat generation is mounted on the substrate 41 in contact with the surface of the heat radiating plate 47 and is thermally bonded to the heat radiating plate 47. . Here, the heat of the heat generating component 49 may be transferred to the heat radiating plate 47 by applying a grease-like thermally conductive silicon filler to the surface of the heat radiating plate 47 or the heat generating component 49 and bringing them into close contact with each other. Good. As described above, the heat of the heat generating component 49 is transferred to the heat radiating plate 47 and is radiated through the heat radiating plate 47, whereby the temperature rise of the heat generating component 49 can be suppressed. Furthermore, the heat generating component 49 can be reliably cooled by arranging the heat generating component 49 on the upstream side of the air passage 25.

Further, as shown in FIG. 10, an exposed window 43 </ b> C that exposes the lower surface of the heat radiating plate 47 to the hollow portion 45 is formed in the flat plate portion 43 </ b> A. Thereby, since air can flow along the lower surface of the heat radiating plate 47 and the heat radiating plate 47 can be air-cooled, the heat of the heat generating component 49 of the substrate 41 can be efficiently radiated.
Further, the substrate 41 is provided with a thermal fuse (not shown). When the temperature of the air passage 25 detected by the thermal fuse exceeds a preset temperature range, the power supply device 40 is forced. It is configured to be turned off automatically. Thereby, it is possible to prevent the power supply device 40 from being overheated due to some trouble caused by the failure of the fan 23 and the like, and thus failure of the power supply device 40 and the LED 9 can be prevented.

  The illuminating device 1 configured as described above is used by being arranged one or more on the gantry. For example, when a plurality of lighting devices 1 are arranged side by side, hot air blown out from one lighting device 1 is blown out of the opening on the outlet side so as not to be sucked into the adjacent lighting device 1. You may provide the guide member (not shown) which changes the wind direction of air.

  As described above, according to the present embodiment, since the control member is configured by the reflection unit 5, the light distribution can be controlled without using a lens, so that the apparatus can be downsized and the apparatus can be significantly reduced in weight. Chromatic aberration can be suppressed.

  In addition, according to the present embodiment, the LED 9 is supported by the heat conductive plate 21 having thermal conductivity, and the fan 23 that blows air toward the back surface 21B of the heat conductive plate 21 is provided. In comparison, since the heat conducting plate 21 can be made smaller, the lighting device 1 can be reduced in size and weight.

  Moreover, according to this Embodiment, since the several fin 21C was formed in the back surface 21B of the heat conductive board 21 along the ventilation direction, since the heat | fever of the light source unit 3 can be thermally radiated effectively, the heat conductive board 21 is used. As a result, the lighting device 1 can be reduced in size and weight.

  Further, according to the present embodiment, since the power supply device 40 that controls the lighting of the LED 9 is arranged in the air passage 25 of the fan 23 substantially in parallel with the air passage 25, the heat of the heat generating component 49 mounted on the substrate 41 is increased. Cooling can be performed efficiently, and the circuit of the power supply device 40 can be stably operated.

However, the above embodiment is an aspect of the present invention, and it is needless to say that the embodiment can be appropriately changed without departing from the gist of the present invention.
For example, in the above embodiment, the reflection unit 5 includes the reflection unit 5A in which three parabolic reflection surfaces 11 are arranged in one row, and the reflection unit 5B in which two parabolic reflection surfaces 11 are arranged in one row. However, the number of reflection units and the number of parabolic reflection surfaces 11 included in each reflection unit are not limited to this, and can be appropriately changed depending on the number of LEDs 9. A reflection unit may be provided for each parabolic reflection surface 11.
In the above embodiment, the lamp case 7 is formed so as to cover the light source unit 3 and the reflection unit 5, but the lamp case 7 does not necessarily need to cover the light source unit 3 and the reflection unit 5. What is necessary is just to form so that the air path 25 may be covered.

Moreover, in the said embodiment, although the two fans 23 were provided in the entrance side and exit side of the air path 25, it is not limited to this, For example, you may provide one fan 23 only in the suction side.
Moreover, in the said embodiment, when arrange | positioning the some illuminating device 1 side by side, it was decided to provide a guide member, However, For example, so that the blower outlet and suction inlet of the adjacent illuminating device 1 may not oppose, As shown in FIG. 11, the fan 23 may be provided on the rear plate 7 </ b> A of the lamp case 7. The lighting device 100 shown in FIG. 11 has substantially the same configuration as the lighting device 1 except that the fan 23 is provided on the rear plate 7A of the lamp case 7, and thus the same parts are denoted by the same reference numerals. The description is omitted.

1 Illumination device (illumination device for high-speed photography)
5 Reflection unit (control member, reflector)
9 LED (light emitting device)
21 heat conduction plate 21B back surface 21C fin 23 fan 25 air passage 40 substrate (control device)

Claims (4)

In a lighting device for high-speed shooting, which includes a light-emitting element and a control member that controls the emitted light of the light-emitting element, and illuminates with light controlled by the control member during high-speed shooting.
An illumination device for high-speed photography, wherein the control member is constituted by a reflecting mirror. The light emitting element is supported on a heat conductive plate having high thermal conductivity,
The high-speed shooting illumination device according to claim 1, further comprising a fan that blows air toward a back surface of the heat conducting plate.   The illumination device for high-speed photography according to claim 1 or 2, wherein a plurality of fins are formed on a back surface of the heat conducting plate along a blowing direction.   The high-speed photographing illumination device according to any one of claims 1 to 3, wherein a control device that controls lighting of the light emitting element is disposed substantially parallel to the air passage in the air passage of the fan.

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