JP3550928B2 - Lighting equipment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an improvement in a lighting device for illuminating an object to be imaged by a CCD camera or the like from a distance.
[0002]
[Prior art]
Since a heat wire for preventing fogging cannot be attached to the Fresnel lens, a glass fixed to the front of the housing and with a hot wire attached to the front of the Fresnel lens is provided. To prevent fogging by warming the entire glass by energizing, or by placing a heater between the Fresnel lens and the front glass, and energizing the heater when there is a danger of the glass being cooled and fogging, the fresnel lens and An effective guide portion was formed between the glasses to efficiently generate a high-temperature updraft and prevent fogging.
[0003]
As a conventional technology for preventing fogging of lighting devices, there is one configured with reference to fogging preventing means in an automobile. FIGS. 4A and 4B show a proposal configured like a rear window in an automobile. FIG. 4A is a front view of a housing, and FIG. 4B is a cross-sectional view showing the inside of the housing. In the figure, reference numeral 20 denotes a glass to which a heating wire is adhered, and constitutes an outer surface of the lighting device together with the housing 9. Inside, 8 is a Fresnel lens, 1 is an LED illuminator, 2 is a control unit, 3 is a fixture for supporting the LED illuminant 1 and the control unit 2, 4 is a current unit, and 5 is a cooling fan. .
[0004]
FIG. 5 is a proposal designed to provide high-temperature rising air by a defroster of a front window in an automobile to prevent fogging, 21 is a heater, 22 is glass, and 1 to 5 and 8, 9 are shown in FIG. It is the same as the lighting device shown.
[0005]
In such a conventional illuminating device, the path of the illuminating light has an optical double structure by the Fresnel lens and the glass. An air flow is generated, and an air flow is applied to the power supply unit 4 on a plane to cool the power supply unit 4. Further, in order to prevent the fogging of the glass, a heater is provided below the glass or a heat ray attached to the glass to prevent the fogging, and power is supplied for that purpose.
[0006]
[Problems to be solved by the invention]
As described above, since the Fresnel lens and the glass have an optically double structure in the path through which the illumination light passes, the attenuation of the illumination power increases due to the respective transmission characteristics. Further, when a heat wire is attached to the front glass, the transmission area is reduced, and furthermore, the power consumption is increased by providing a heat source such as a heat wire or a heater, and thus improvement has been desired.
[0007]
The present invention has been made to solve such a conventional problem, and proposes a lighting device that minimizes deterioration of the transmission characteristic of illumination light and does not require power consumption for a new heat source.
[0008]
[Means for Solving the Problems]
In the lighting device according to the first aspect, the heat generated by the LED illuminator and the control unit is efficiently drawn by the cooling fan suction effect by the inlet guide unit, and then the cooling air is efficiently discharged from the cooling fan discharge port by the outlet guide unit. This is configured to pass through the upper part of the power supply unit and to be guided to the lower part of the Fresnel lens which forms the outer surface together with the housing.
[0009]
The lighting device according to the second aspect of the present invention includes a comparing device that constantly monitors the humidity of the Fresnel lens and compares the humidity with an allowable humidity, and an alarm device that issues an alarm when the allowable humidity is reached due to an abnormality of a component such as a failure of a cooling fan. It is comprised by these.
[0010]
The lighting device according to the third aspect of the present invention is configured to supply dry air to the Fresnel lens while lowering the humidity of the entire housing and increasing the dryness.
[0011]
Further, the lighting device according to the fourth aspect of the present invention includes a comparison device that monitors and compares the temperature outside the housing and the humidity inside the housing, and cools the ambient air temperature that is allowed for each component within the allowable humidity range. The control device includes a control device for controlling the fan not to be used, and a drive device for opening a guide portion provided at an upper portion of the power supply portion for securing heat radiation.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
FIG. 1 shows a first embodiment of the present invention, in which 1 is an LED illuminator, 2 is a control unit for controlling the light emission timing of the LED illuminant 1, and 3 is a mounting supporting the LED illuminant 1 and the control unit 2. A tool 4 is a power supply unit for supplying power to the LED illuminant 1 and the control unit 2, a cooling fan 5 for forcibly cooling the LED illuminant 1, the control unit 2 and the power supply unit 4, and 6 is an inlet of the cooling fan 5. An inlet guide section for efficiently forming a descending airflow, an outlet guide section for efficiently cooling the power supply section 4 with the airflow discharged through the cooling fan 5, and an LED guide section 8 for the LED light emitting element 1 A Fresnel lens 9 for making the illumination light efficient with respect to the illumination target, and a housing 9 that forms an outer surface together with the Fresnel lens 8.
[0013]
FIG. 2 is a sectional view showing a cooling system inside the lighting device shown in FIG. 1, wherein reference numeral 10 denotes a humidity sensor provided in a Fresnel lens inside the housing 9, and reference numeral 11 denotes a suction port of the cooling fan 5. , A reference numeral 12 denotes a desiccant provided in the inlet guide portion 6, and a reference numeral 13 denotes a flow of the second cooling air from the outlet of the cooling fan 5. Reference numeral 14 denotes rising air on the inner surface of the Fresnel lens 8.
[0014]
In FIG. 2, reference numeral 15 denotes a comparison device for comparing the response amount from the humidity sensor 10 with the allowable humidity, and 16 denotes an alarm device for issuing an alarm when the comparison device 15 exceeds the allowable humidity.
[0015]
FIG. 3 is a view of the inside of the housing as viewed from the Fresnel lens 8 side. Reference numeral 17 denotes a temperature sensor provided outside the housing, and reference numeral 18 denotes an upper portion of the power supply portion 4 which rotationally drives an exit guide portion 7 having a two-part surface. An opening / closing drive section 19 for opening and closing is a control device for controlling the cooling fan 5 and the opening / closing drive section.
[0016]
Next, the operation of the first embodiment will be described. When power is supplied to the power supply unit 4 to operate the lighting device, power is supplied from the power supply unit 4 to the LED luminous body 1 and the control unit 2, and the LED luminous body emits light. The LED illuminator 1 is controlled by the control unit 2 so as to emit light at a certain timing. In order to continuously and stably obtain this light emitting operation, these components are required. Needless to say, appropriate cooling is necessary so as to be within the operating temperature range. An inlet guide 6 for the suction port of the cooling fan 5 is provided for this purpose, forms a stable first cooling air 11 on the mounted electrical components of the LED illuminant 1 and the control unit 2, and Heat is gradually absorbed while cooling, and the air temperature at the inlet of the cooling fan 5 is rising. At the inlet of the cooling fan 5 of the inlet guide section 6, the moisture in the air is absorbed by the desiccant 12 with respect to the first cooling air 11, and is constituted by the power supply section 4 and the outlet guide section 7 when passing through the cooling fan 5. While the second cooling air 13 flows through the space and cools the mounted electric components of the power supply unit 4, the temperature of the device itself further increases. The dry rising air 14 guided to the lower part of the Fresnel range 8 prevents the Fresnel lens 8 from reaching a dew point temperature according to the outside air temperature and causing fogging, and maintains the transmission characteristics of illumination light soundly. . In this way, the circulation of the cooling air is monitored while increasing the degree of drying of the air inside the lighting device.
[0017]
The reason why the humidity sensor 10 is provided on the Fresnel lens 8 will be described. The illumination device is generally used together with a device having an imaging system using a camera, and the deterioration of the illuminance directly affects the deterioration of an image obtained by the imaging device on an object. Therefore, in order to evaluate the soundness of the illumination-imaging system, it is required to check the soundness of only the illumination device separately from the imaging device, and the important factor is the transmittance of the Fresnel lens 8, It is necessary to monitor that the object is being given proper illuminance due to the absence of fogging.
[0018]
Further, by monitoring the humidity of the Fresnel lens 8 with the humidity sensor 10, the humidity at which the fogging that interferes with the illuminance is set in the comparator 15 in advance. An abnormality will be issued from the alarm device 16.
[0019]
Furthermore, when the external temperature is high such as in summer and the internal temperature further increases due to internal heat generation or heat intrusion through the housing 9, the cooling fan 5 may be operated continuously due to restrictions on the thermal conditions of the device. Many. However, when the external temperature is low and there is no need to cool the equipment inside the housing in winter or the like, the response amount of the temperature output from the temperature sensor 17 is input to the comparison device 15, and the humidity output from the humidity sensor 10 is output. The dew point temperature is compared with the response amount. If the internal humidity does not reach the dew point at the external temperature, the cooling fan 5 is not operated by the output from the control device 19. At this time, the outlet guide section 7 having the two divided surfaces is rotated by the control device 19 above the power supply section 4 and the upper portion of the power supply section 4 is opened, so that heat radiation can be improved.
[0020]
Embodiment 2 FIG.
Although the first embodiment is a lighting device using an LED illuminant, the illuminant works continuously or simply, and circulating air of forced air cooling for cooling heat generated from those electric devices is used. Other lighting devices that can be used effectively can also be applied.
[0021]
By the way, in the above description, the case where the present invention is applied to a lighting device has been described. However, it goes without saying that the present invention can also be used for a device in which a heat-generating device is mounted and internal dew is obstructed.
[0022]
【The invention's effect】
As described above, according to the present invention, the heat from the heat-generating device is effectively used, and the airflow with a high degree of dryness having a defroster effect is formed in the Fresnel lens portion through which the illumination light passes. Since the glass and heater on the front surface are not required, the Fresnel lens can be exposed directly to the outermost part, improving the transmission characteristics of the illumination, improving the transmission area, and eliminating the need to install a separate anti-fog glass. , Power consumption can be improved.
[0023]
In addition, since the Fresnel lens is provided with a humidity sensor, a comparison device for allowable humidity, and an alarm device when the humidity sensor exceeds the humidity sensor, the soundness of the imaging system can be guaranteed.
[0024]
Furthermore, a comparison device for setting the conditions required for the operation of the cooling fan is provided, and this output can be used to start and stop the operation of the cooling fan by the control device, thereby extending the life of the cooling fan. Further, power consumption can be reduced.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of an embodiment of a lighting device according to the present invention.
FIG. 2 is a sectional view showing a cooling air circulation system according to the present invention.
FIG. 3 is a diagram of a lighting front part according to the present invention as viewed from the inside.
FIG. 4 is a front view and a sectional view showing a conventional lighting device.
FIG. 5 is a cross-sectional view showing a conventional lighting device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 LED light-emitting body, 2 control part, 4 power supply part, 5 cooling fan, 7 outlet guide part, 10 humidity sensor, 12 desiccant, 15 comparison device, 16 alarm device, 17 temperature sensor, 18 opening / closing drive part, 19 control device .

Claims (4)

An LED illuminator for lighting;
A control unit for controlling the light emission timing of the LED light emitter;
A power supply unit for supplying power to the LED emitter and the control unit,
The LED light emitter, and a cooling fan for forced air cooling of the control unit and the power supply unit,
A Fresnel lens that illuminates the light emitted from the LED illuminant at a distance from the diaphragm;
An inlet guide portion that is mounted at the inlet of the cooling fan and forms an air flow ;
An outlet guide that introduces the air flow from the cooling fan to a lower portion of the Fresnel lens and blows the air flow from a substantially lower portion to a substantially upper portion of the Fresnel lens ,
At least, a housing that covers the Fresnel lens , the LED illuminant, the control unit, the power supply unit, the cooling fan, the entrance guide unit, and the exit guide unit;
A lighting device comprising: A humidity sensor provided in the housing of the Fresnel lens,
A comparison device for comparing the allowable humidity response amount as preset from the humidity sensor,
An alarm device that generates an alarm when an abnormality of the lighting device is detected based on a comparison result of the comparison device ;
The lighting device according to claim 1, further comprising: The lighting device according to claim 1 , wherein a desiccant is provided near an inlet of the cooling fan to generate an airflow with a high degree of drying . A humidity sensor provided in the housing of the Fresnel lens,
A temperature sensor provided outside of said casing,
A comparison device for comparing relative amount of response and tolerance control amount and the amount of response from the temperature sensor from the humidity sensor,
Until the response amount from the temperature sensor reaches the allowable temperature, the opening and closing drive unit to stop the cooling fan as long as it does not exceed the allowable humidity, rotates the exit guide portion,
A control device for controlling the opening and closing drive unit and the cooling fan,
The lighting device according to claim 1, further comprising:

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