JPH08114835A - Near infrared rays lighting device - Google Patents

Abstract

PURPOSE: To provide an inexpensive near infrared rays lighting device imparting no dazzle to a person by constituting so as to generate near infrared rays by emitting light of a halogen lamp through heat resistant glass performed with near infrared rays transmission coating. CONSTITUTION: The halogen lamp 16 is provided as a light source, and the halogen lamp 16 is lighted by a voltage of AC 100V. Then, a reflection mirror 17 made of aluminum or aluminous vapor deposited of a parabolic shape having an effect gathering light diffusing backward, upward/downward, leftward/ rightward for turning the light quantity of the halogen lamp 16 to the front is used. The heat resistant glass 18 with near infrared rays transmission coating which is vapor deposited with a coating transmitting a near infrared wavelength on the heat resistant glass is irradiated by the light outgoing to the front by the halogen lamp 16 and the reflection mirror 17. The near infrared rays visible reddish black to a human eye are emitted from the heat resistant glass 18 with near infrared rays transmission coating. Thus, no dazzle is felt. Further, a reinforced glass plate 15 is provided in front of the heat resistant glass 18 with the near infrared rays transmission coating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a near-infrared illuminating device used when taking a picture with a camera.

[0002]

2. Description of the Related Art A vehicle, a person, etc. are monitored outdoors using a camera, but when monitoring day and night, it is necessary to use a light for taking a picture with the camera. Even if the shooting point is a bright place in the daytime, lighting for shooting is required at night. That is, even if there is something like a streetlight, it is not always sufficient as a light for shooting with a camera. Also, even if there is a street light and the brightness is sufficient, a metal halide lamp like a mercury lamp has a flicker that is hard to see with the eyes like a fluorescent light called a flicker, and if it is not synchronized with the camera shutter, it will be a dark image. It may become. Therefore, it was necessary to positively illuminate the point where the camera shoots. Recently, there is a flickerless power supply that suppresses flicker, but it is necessary to provide it as a separate housing and the power supply itself is expensive.

In order to meet such a demand, a near-infrared strobe device as shown in FIGS. 7 and 8 has been conventionally proposed. FIG. 7 shows a conventional near-infrared strobe device of this kind, and FIG. 8 is a perspective view showing a situation of vehicle photography using this kind of strobe device. First, shooting on the road will be described with reference to FIG. In FIG. 8, 1 is a road,
Reference numeral 2 is a vehicle that goes straight in the direction of the arrow, and 3 is a vehicle detection sensor provided in front of the traveling direction of the vehicle 2, and this vehicle detection sensor 3 is mounted on a rod-shaped member as shown in the figure.
Reference numeral 4 denotes a vehicle sensor controller which gives a sensor signal detected by the vehicle detection sensor 3 to a controller 5 of a camera 7 and a strobe power source 6 which are further provided in front of the vehicle. It is attached to a supporting pillar. Reference numeral 5 is a controller that gives an image pickup command to the camera 7 by a sensor signal given to the vehicle sensor controller 4,
6 is a strobe power source that gives a strobe light emission command to the strobe lamp body 8 by a sensor signal given to the vehicle sensor controller 4, 7 is a camera that receives an image pickup command from the controller 5, and 8 is a strobe power source 6 Is a strobe lamp body that emits light in response to a strobe light emission command from the camera 7. The camera 7 and the strobe lamp body 8 are mounted on a rod-shaped member as shown in the figure. It is attached to a column that supports the rod-shaped member to which the strobe lamp body 8 is attached. Reference numeral 9 is a light projecting area projected by the strobe lamp body 8.

Next, the operation of the conventional near-infrared lighting device will be described. In FIG. 7, 10 is a conventional near-infrared strobe device. Reference numeral 11 is a strobe lamp unit in which a discharge tube emits light in response to a light emission command from a strobe power source. Reference numeral 12 is a strobe lamp unit cooling fan for air cooling the heat generated by the discharge tube of the strobe lamp unit to prevent cracking of the discharge tube.
Reference numeral 3 denotes a near-infrared transmission filter for transmitting a near-infrared light component of white light emitted from the strobe lamp unit to reduce dazzling of white light to human eyes, and 14 has passed through the near-infrared transmission filter. A Fresnel lens for irradiating a desired area in the front with near-infrared light, and a tempered glass 15 for protecting the Fresnel lens. Of the light emitted from the strobe lamp unit, the near-infrared light that has passed through the near-infrared transmission filter is diffused by the Fresnel lens to project the desired light projecting area 9 in FIG.

[0005]

The above-mentioned conventional near-infrared strobe device has the following problems. (1) A strobe power supply housing that gives a high voltage to light the strobe is required. (2) Heat is generated by the discharge energy from the strobe discharge tube, and a device for constantly cooling the discharge tube is required. (3) The strobe discharge tube itself is expensive. (4) It was necessary to provide synchronization between the shutter for photographing with the camera and strobe light emission. (5) Light was always emitted at the timing of detection by the vehicle sensor regardless of day or night. (6) The strobe power source is large in order to form a redundant system when the strobe discharge tube is broken, and the strobe power source and the strobe lamp unit are expensive.

The present invention has been made in order to solve the above problems, and uses an inexpensive halogen lamp without using a separate power source for lamp discharge and a device for cooling the lamp, and requires a synchronizing signal with the camera. If there is a sufficient amount of light for the camera to take an image, the lighting is not turned on. If the lamp breaks down and the lamp does not emit light at the end of its life, two redundant systems are assembled at low cost and the lamp will burn out when lighting is required. It is an object of the present invention to provide a near-infrared lighting device that does not wake up.

[0007]

In the first embodiment of the near-infrared lighting device according to the present invention, an inexpensive halogen lamp which can be lit at a commercial single-phase AC voltage of 100 V without requiring a power source device for lamp light emission. And a heat-resistant glass with a near-infrared transparent coating that is not broken by the heat of the halogen lamp.

In the second embodiment of the present invention, a heat-resistant glass is provided on the front surface of the halogen lamp, and a near-infrared transmitting filter is arranged on the front surface of the heat-resistant glass at a position spaced apart from the heat-resistant glass. By providing an air layer in the, the near-infrared transmission filter was prevented from being broken by the direct heat from the halogen lamp.

Further, in the third embodiment of the present invention, the front surface of the reflecting mirror is covered with a heat resistant glass coated with a near infrared ray transmitting coat, and a filament, a halogen compound are enclosed in the lamp, the reflecting mirror and the near infrared ray transmitting filter. It is an integrated one.

Further, in the fourth embodiment of the present invention, a light quantity monitor for monitoring lamp burnout is provided.

Further, in the fifth embodiment of the present invention, when a sufficient amount of light can be obtained without turning on the daytime lamp, the outside light sensor for determining the reference for turning off the lamp and the lamp are turned on / off. It has a solid state relay.

Further, in the sixth embodiment of the present invention, two halogen lamps are provided, and a switch for switching the power supply is provided in order to monitor the light amount of one lamp and turn on the other lamp when one lamp is burnt out. It is a thing.

[0013]

In the first embodiment constructed as described above, near-infrared light is generated by passing through the heat-resistant glass coated with near-infrared light to the light emitted from the halogen lamp.

In the second embodiment, similarly to the above, near infrared light is generated without dividing the near infrared filter made of colored glass by the heat of the halogen lamp.

In the third embodiment, a lamp, a reflecting mirror and a near infrared transmitting filter are integrated to generate near infrared light.

The fourth embodiment also monitors lamp burnout.

In the fifth embodiment, the lamp life is extended by turning off the lamp.

In the sixth embodiment, the lamp does not burn out when illumination is required.

[0019]

【Example】

Example 1. First Embodiment FIG. 1 is a configuration diagram of a first embodiment of a near-infrared lighting device according to the present invention. As is apparent from FIG. 1, this embodiment has a halogen lamp 16 as a light source, and the halogen lamp 16 is lit at a voltage of 100 V AC. In order to direct the light quantity of the halogen lamp 16 to the front side, a parabolic aluminum mirror or aluminum-deposited reflecting mirror 17 having an effect of collecting light diffused rearward, upward, downward, leftward and rightward is used. The light radiated to the front surface by the halogen lamp 16 and the reflecting mirror 17 is radiated to the heat-resistant glass 18 with a near-infrared transmitting coat, which is formed by vapor-depositing a coating that transmits near-infrared wavelengths on heat-resistant glass. Heat-resistant glass with near-infrared transparent coating 1
From No. 8, since the near-infrared light that looks red and black is emitted to the human eye, no dazzling is felt. Further, a tempered glass 15 is provided on the front surface of the heat-resistant glass with a near-infrared transparent coating so as not to be easily repelled by dust and pebbles from the outside and scratched by stones. The near-infrared lighting device 19 including the tempered glass 15, heat-resistant glass 18 with a near-infrared transparent coating, a halogen lamp 16, and a reflecting mirror 17 is an outdoor splash-proof housing, and is electrically connected to internal equipment when water enters from the outside. It is designed so that there is no short-circuiting abnormality.

Example 2. FIG. 2 is a diagram showing a second embodiment of the present invention. In the above-mentioned Example 1, near-infrared light is obtained by heat-resistant glass with a near-infrared transmitting coat, but in order to emit near-infrared light, it is also possible to use colored glass which is made by mixing a red dye into glass and making it into a colloidal form. The near infrared transmission filter 13 can be made. However, since the red substance is dispersed in the glass as very small particles, the near-infrared transmission filter 13 may be broken by the radiation of heat from the halogen lamp. Therefore, by disposing the heat-resistant glass 20 between the halogen lamp 16 and the near-infrared transmitting filter 13, an air layer is formed to prevent the near-infrared transmitting filter 13 from being broken. 15 through 17 and 19 in FIG.
Are the same as or equivalent to the same symbols.

Example 3. FIG. 3 is a diagram showing a third embodiment of the present invention. In the first embodiment, near-infrared light is generated from a halogen lamp, a reflector, and a heat-resistant glass with a near-infrared transmitting coat. In order to integrate them, the front surface of the reflecting mirror is covered with heat-resistant glass to make it airtight and a halogen compound and filament are enclosed inside to make a shield beam halogen lamp. The outer surface of the heat-resistant glass is coated with a near infrared ray transmitting coating similar to that of the first embodiment, and near infrared ray is generated by the shield beam halogen lamp 21 with a near infrared ray transmitting coat. By reducing the number of parts, it is possible to reduce size and weight. FIG.
15 and 19 are the same as or equivalent to the same reference numerals in FIG.

Example 4. FIG. 4 is a diagram showing a fourth embodiment of the present invention. In FIG. 4, the halogen lamp 16 and the reflecting mirror 17 are the same as those in the first embodiment. Reflector 17
A hole is bored near the center of the lamp as a mounting portion for the halogen lamp 16, and the halogen lamp 16 is housed in the hole. Make a slight gap between the position where the halogen lamp 16 is fixed and the hollowed hole in the center of the reflector.
A halogen lamp light amount monitoring photodiode a22 is provided in order to monitor the light leaking from the gap to the back surface of the reflecting mirror 17. Further, in order to protect the photodiode 22 from the radiant heat of the halogen lamp, a heat shield plate 23 with a light amount window having a small window for only the light receiving portion of the photodiode to obtain light is provided. The photodiode 22 sends a signal to the controller 5 when the lamp burns out, and the controller 5 outputs to the outside that the halogen lamp burns out and is replaced. Reference numerals 15, 18, and 19 in FIG. 4 are the same as or equivalent to the same reference numerals in FIG.

Example 5. FIG. 5 is a diagram showing a fifth embodiment of the present invention. In FIG. 5, the photodiode 22 operates in the same manner as in the fourth embodiment, notifies the controller 5 that the halogen lamp 16 has burned out, and the controller 5 needs to receive the signal and stop the power supply to the halogen lamp 16. is there. Therefore, a halogen lamp ON / OFF control solid state relay a24 for controlling the ON / OFF of the halogen lamp power supply is provided. In addition, the halogen lamp is turned on so that the light can be turned off when it is not needed during daytime.
An external light sensor 25 for turning on / off is provided. The external light sensor 25 constantly monitors the illuminance of external light and sends a signal to the controller 5. The controller 5 monitors the lamp off with the photodiode 22, monitors the illuminance of external light with the external light sensor 20, and issues an ON / OFF command for the halogen lamp to the solid state relay 2
4 to control the ON / OFF of the halogen lamp. Further, 15 to 19 and 23 in FIG. 5 are the same as or equivalent to the same reference numerals in FIG.

Example 6. FIG. 6 is a diagram showing a sixth embodiment of the present invention. In FIG. 6, 5, 15-19, 22-24
Are the same as or equivalent to the same reference numerals in FIG. Figure 6
Is a configuration having two systems shown in FIG. 5 and having a redundant system for turning on the halogen lamp of the other one so that the halogen lamp does not always run out when one halogen lamp burns out. For example, first photodiode 2
Suppose that the lamp monitored in 2 is on and the lamp suddenly runs out. A lamp burnout signal from the photodiode 22 is sent to the halogen lamp power supply changeover switch 26.
Halogen lamp O which receives an OFF command to the solid state relay a24 that has been supplying power until then, and controls ON / OFF of the halogen lamp to be turned on next.
ON for solid state relay b27 for N / OFF control
Issue a command. ON from solid state relay b27
The other halogen lamp is turned on by the command. The controller 5 indicates that the halogen lamp light quantity monitoring photodiode b28 detects the light quantity of the halogen lamp.
Tell The controller 5 receives a signal from the photodiode 28 and recognizes that the halogen lamp that was first turned on is burned out, and raises an alarm of the halogen lamp burnout to the outside.

[0025]

Since the present invention is constructed as described above, it has the following effects.

According to the first embodiment, the near infrared light can be generated with a simple structure of the halogen lamp, the reflecting mirror, and the heat resistant glass with the near infrared ray transmitting coat, and a separate power supply housing is not required, so that the manufacturing cost is low. be able to.

Further, according to the second embodiment, by providing an air layer between the near infrared ray transmitting filter and the heat resistant glass, the near infrared ray can be generated without dividing the near infrared ray transmitting filter by the heat of the halogen lamp. .

Further, according to the third embodiment, it is possible to reduce the size and weight by integrating the reflecting mirror, the heat resistant glass with the near infrared ray transmitting coat and the halogen lamp.

According to the fourth embodiment, the life of the lamp can be detected by providing the halogen lamp light quantity monitor.

According to the fifth embodiment, an external light sensor,
By providing a solid state relay for lamp ON / OFF control, the lamp can be turned off when a sufficient amount of light can be obtained without turning on the lamp, so that the power supply to the lamp can be saved and the lamp life can be extended.

Further, according to the sixth embodiment, when a lamp burnout occurs, it is possible to switch to another lamp by providing a redundant system for switching the lamp power supply.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a second embodiment of the present invention.

FIG. 3 is a diagram showing a third embodiment of the present invention.

FIG. 4 is a diagram showing Embodiment 4 of the present invention.

FIG. 5 is a diagram showing a fifth embodiment of the present invention.

FIG. 6 is a diagram showing Embodiment 6 of the present invention.

FIG. 7 is a diagram showing a conventional near-infrared lighting device.

FIG. 8 is a perspective view showing a situation of photographing a vehicle using a conventional near-infrared lighting device.

[Explanation of symbols]

1 road, 2 car, 3 vehicle sensor, 4 vehicle sensor controller, 5 controller, 6 strobe power supply, 7 camera, 8
Strobe lamp body, 9 light emitting area, 10 near-infrared strobe device, 11 strobe lamp unit, 12 strobe lamp unit cooling fan, 13 near-infrared transmission filter, 14 Fresnel lens, 15 tempered glass, 16
Halogen lamp, 17 Reflector, 18 Heat-resistant glass with near infrared transmission coat, 19 Near infrared illumination device, 20
Heat-resistant glass, 21 Shielded beam halogen lamp with near-infrared transparent coat, 22 Halogen lamp Photodiode a for monitoring light intensity, 23 Heat shield with light intensity window, 24 Solid state relay for halogen lamp ON / OFF control 25, Halogen lamp ON / External light sensor for OFF, 26 Halogen lamp power supply changeover switch, 27
Halogen lamp ON / OFF control solid state relay b, 28 Halogen lamp light intensity monitor photodiode b.

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location G03B 15/02 V

Claims (6)

[Claims] 1. A halogen lamp that is turned on by supplying a voltage of 100 V AC, a reflecting mirror that reflects the light on the rear surface of the halogen lamp to the front surface, and a near red light that is radiated to the front surface by the halogen lamp and the reflecting mirror. A heat-resistant glass with a near-infrared transparent coat that has a coating that transmits external light components, and that protects the heat-resistant glass with a near-infrared transparent coat and transmits near-infrared light that passes through the heat-resistant glass with a near-infrared transparent coat. A near-infrared illuminating device comprising: a tempered glass capable of performing the above, a halogen lamp, the reflecting mirror, a heat-resistant glass with a near-infrared transmitting coat, and a lighting device housing that houses the tempered glass. 2. The near infrared illuminating device according to claim 1, wherein an air layer is provided between the near infrared transmitting filter and the heat resistant glass. 3. A near-infrared ray lamp according to claim 1, which is a shield beam halogen lamp with a near-infrared ray transmissive coat in which a halogen lamp and a reflecting mirror are integrated, and a near-infrared ray transmissive coating is applied to a glass surface of the halogen lamp. Lighting equipment. 4. A halogen lamp light amount monitoring photodiode for detecting the life of the halogen lamp by monitoring the amount of light leaking from the gap between the halogen lamp and the lamp fixing portion of the reflecting mirror, and the halogen lamp light amount monitoring photodiode. The near-infrared lighting device according to claim 1, further comprising a heat shield plate with a light amount window for protecting the lamp from heat generated by radiation from a halogen lamp. 5. A halogen lamp ON / OFF control solid-state relay for controlling ON / OFF of the halogen lamp, and an ON of the halogen lamp by judging the brightness of external light.
The near-infrared lighting device according to claim 4, further comprising a halogen lamp ON / OFF external light sensor that determines ON / OFF. 6. A halogen lamp, a reflecting mirror, a heat-resistant glass with a near-infrared transparent coating, a tempered glass, a halogen lamp light quantity monitor photodiode, a light quantity window heat shield, and a halogen lamp ON / OFF control solid state relay.
System is installed, and it is detected that the halogen lamp of the first system has burned out from the light intensity monitoring photodiode of the first system.
Halogen lamp power ON / OFF control solid state relay is turned OFF, second system halogen lamp ON / OFF control solid state relay is turned ON, and second system halogen lamp is turned ON Halogen lamp power supply switching A switch and a photodiode for monitoring the amount of halogen lamp that has been switched by the halogen lamp changeover switch to notify the fact that the halogen lamp of the first system has burned out to the outside are provided to prevent lamp burnout. The near-infrared lighting device according to claim 4, further comprising a redundant system for the purpose.