JPH0685331A - Projector - Google Patents

Abstract

PURPOSE:To elongate the distance of projection by fitting the infrared ray light emitting diode of an emitter into a package, directing it frontward. CONSTITUTION:A through hole for passing a power cable 2 is opened in the proper place of a package 1. Moreover, a plurality of infrared ray light emitting diodes 5 are arranged on the surface of a board 4, which is of a disc shape so as to be fit in the package 1, and the infrared ray light emitting diodes 5 are wired on the rear. A plurality of infrared ray light emitting diodes 5 are wired in series to form a set of light emitting array, and plural sets of arrays are wired in parallel. Each light emitting array is provided with a resistor, and an emitter 6, whose power cord 2 is distributed on the other side of the board 4, is installed inside the package, so that the side of infrared ray light emitting diodes may be frontward, from the side of opening of the package 1. Then, the emitter 6 and the package 1 are fixed to each other by setting resin material 7 or the like, which has waterproof property, between the emitter 6 and the armor case 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light projecting device used as a light source when photographing an infrared camera such as a security camera or a surveillance camera, or as a supplementary light for research, under dark, and low illuminance.

[0002]

2. Description of the Related Art Conventionally, as a light projecting device, an infrared transmitting filter was attached to the front surface of a light bulb, but no one using an infrared light emitting diode as the light emitting body according to the present invention. That is, as a general conventional floodlighting device, an infrared transmission filter capable of passing only infrared light through the housing opening surface after a single infrared light is installed in the housing with the front surface opened and facing forward. For example, in a projector for night vision, when the light source is visible to the outside with the naked eye, the presence of a camera or the like is confirmed from the subject side. In order to hide the above from the outside, an infrared transmission filter is provided on the front surface of the housing, and the illuminant is irradiated onto the subject through the infrared transmission filter.

[0003]

However, if infrared rays are projected through the infrared transmission filter, the light source distance is reduced, and the projection distance is short even though the camera itself has a photographing ability. This made long-distance photography impossible.

Further, in the near infrared light, since the infrared light can be seen by the naked eye from the subject side, it cannot be used directly with the infrared light or the electric bulb covered, and the infrared transmission filter is required. It was something to do.

Furthermore, the life of the light bulb such as the tungsten bulb used as the infrared light or the light source is limited to about 2,000 hours at present, and it has been troublesome to frequently replace the light bulb.

[0006] Further, there is also one that uses a large infrared light to extend the projection distance, but the housing itself for accommodating the large infrared light also becomes large and heavy and heats up at high temperature. It was difficult to move easily by hand.

[0007]

In order to solve the above-mentioned problems, the present invention comprises an outer case having an open front surface, and a light-emitting body in which a plurality of infrared light-emitting diodes are arranged on a substrate in association with a power source. The gist of the invention is a light projecting device in which the infrared light emitting diode of the light emitting body is fitted in the exterior case so as to face forward.

It is also conceivable that, as the light emitting body, a plurality of sets of light emitting aggregates in which a plurality of infrared light emitting diodes are wired in series are assembled and arranged on the substrate.

Further, it is conceivable that an AC or DC power source is used as the power source.

Further, it is preferable that the infrared light emitting diode uses a wavelength that is not visible to the naked eye, and it is conceivable to use, for example, a gallium arsenide-based material.

It is also conceivable to position a light emitting body around the lens of a photographing camera or the like.

It is also conceivable that the outer case is provided with cooling means, and it is also preferable that the outer case is provided with a fitting.

Further, it is conceivable that the floodlighting device of the present invention itself is housed in an outer case or the like and installed so as not to be seen from the outside.

[0014]

In the light projecting device according to the present invention having the above-described structure, the light-emitting body in the outer case emits light to project light by energizing the object with the outer case open surface facing the subject.
Further, if the wavelength of the infrared light emitting diode of the light emitter is a wavelength that is not visible to the naked eye, for example, 890 nm or 940 nm with a peak wavelength set to 800 nm or more, the projected light will not be visible to the naked eye and this projected light will not be visible. The subject is photographed by a night-vision camera or the like that senses the infrared region while irradiating the subject with light.

[0015]

The details of the present invention will be further described with reference to the accompanying drawings. FIG. 1 is an exploded perspective view showing an embodiment of the present invention,
FIG. 2 is a sectional view thereof. That is, reference numeral 1 in the drawing denotes an outer case formed in a cylindrical shape with an open front surface, and it is considered that the outer case 1 is made of metal, ceramic, synthetic resin, or the like. A through hole 3 for opening the power cord 2 is opened. Reference numeral 4 in the drawing denotes a substrate made of synthetic resin, ceramic, or the like. The substrate 4 is a disc-shaped member for fitting in the outer case 1, but is fitted in the outer case 1. It is not specified as long as it has a shape. Then, a plurality of infrared light emitting diodes 5 are arranged on the front surface of the substrate 4, and the infrared light emitting diodes 5 are connected on the back surface. In this embodiment, as shown in FIG. 3, a plurality of infrared light emitting diodes 5 and 5 are connected in series to form a plurality of sets of light emitting aggregates A ₁ , A _2, ... ₁ and A ₂ ... Are connected in parallel, and each light emitting assembly A ₁ , A ₂ ... Is provided with a resistor. Further, a gallium arsenide system is used as the infrared light emitting diode 5. For example, in the case of gallium aluminum arsenide, the wavelength range is determined by adjusting the aluminum content, so that the high quality infrared light emitting diode 5 having a stable wavelength range is not visible to the naked eye. 800nm or more that seems to be invisible, for example 890nm,
It is possible to set it to 940 nm.

After the light emitting body 6 in which the power cord 2 is connected to the other surface of the substrate 4 from the open surface side of the outer case 1 formed as described above is installed so that the infrared light emitting diode 5 is in the front, the light emitting body is formed. The light emitting body 6 and the outer case 1 are fixed to each other by a waterproof resin material 7 or the like at a joint portion between the outer case 1 and the outer case 1 to prevent water from entering the inside of the substrate 4 from the front side. It is also possible to cover the front surface side of the substrate 4 excluding the infrared light emitting diode 5 with the resin material 7 or another waterproofing material. In addition, the inner surface of the outer case 1 and the substrate 4
If a support member 8 such as a pillar or a collar for locking the substrate 4 is formed on the back side, the substrate 4 can be installed at a fixed position without rattling when it is installed. Incidentally, it is natural that the through hole 3 is also waterproofed with the resin material 7 or the like so that water, dust and the like do not enter the inner surface of the substrate 4.

FIG. 4 is a perspective view showing another embodiment of the luminous body. That is, by forming an opening 9 in the center of the substrate 4 of the light emitting body 6 and fixing the camera lens position in the opening 9, the light projecting direction can be set in association with the shooting direction of the camera lens. Further, by providing a mounting tool (not shown) which is detachable from the camera body on the outer case 1, the outer case 1 and the camera body are fixed to each other so that the light projection direction described above is interlocked with the photographing direction of the camera lens. Can also be considered. Incidentally, it is conceivable that the attachment is provided with a single device or a plurality of devices.

When the front surface side of the light projecting device of the present invention formed as described above, that is, the open surface of the outer case 1 is directed toward the object, a plurality of infrared light emitting diodes 5 and 5 emit light all at once. Therefore, the light projection distance is extended in proportion to the number of the infrared light emitting diodes 5 by directly projecting light as a plurality of integrated light sources instead of the light projection distance of the single infrared light emitting diode 5. By the way, if the number of infrared light-emitting diodes 5 is doubled, the projected distance will be about 1.4 times longer. However, although the projection distance is proportional to the number of the infrared light emitting diodes 5, a plurality of infrared light emitting diodes 5 and 5 are wired in series to form one set of light emitting assembly A, instead of simply increasing the number of the infrared light emitting diodes 5. By doing so, it is possible to make many infrared light-emitting diodes 5 emit light at a low voltage by wiring these aggregates A in parallel while minimizing the voltage applied to one infrared light-emitting diode 5, and to energize them. Since it is possible to minimize the emitted heat at times, the light projection distance can be lengthened at a low voltage, and the life time thereof can be extended.

The power source may be either an AC or DC power source, but if an AC power source is used, the current will flow discontinuously, so that the infrared light emitting diode 5 does not emit light continuously. The heat generation of the infrared light emitting diode 5 can be suppressed, and as a result, the projection distance can be extended.

Further, by storing the device of the present invention in an outer case such as a speaker box (not shown), the device itself is hidden from the outside and installed so that only infrared rays can be projected. As shown in FIG. 5, for example, as shown in FIG. 5, if the present device is camouflaged by forming it like a lighting fixture or a loudspeaker, and the presence of the present device cannot be confirmed from the subject side, it can be used for crime prevention. The effect is great.

[0021]

As described above, in the light projecting device according to the present invention, since there is nothing that obstructs the light emission of the infrared light emitting diode on the front surface of the outer case, the light projecting distance can be extended. Also, even though the light emitted from the infrared light emitting diode itself reaches the subject directly, if the wavelength of the infrared light emitting diode is set to a wavelength range that is invisible to the naked eye, for example, 800 nm or more, the light emission of the light emitting body is visible from the subject side. Since you can't see it, you won't notice the subject in shooting in the dark.
Moreover, as described above, long-distance photographing is possible, and it can be used as a monitoring device for security and the like. Furthermore, since a plurality of infrared light emitting diodes are arranged as a light emitter,
It is possible to extend the projection distance in proportion to the number of infrared light emitting diodes, but instead of simply increasing the number of infrared light emitting diodes, a plurality of infrared light emitting diodes are wired in series to form a set of light emitting sets. By forming a body and wiring these light-emitting assemblies in parallel, the maximum number of infrared light-emitting diodes can be made to emit light with a minimum voltage. The distance is extended. However, the luminescent heat is emitted from the light-emitting body to some extent, and it may be high temperature depending on the type of the infrared light-emitting diode.
In that case, if the outer case is provided with a cooling means, the emitted heat can be suppressed. Further, if the outer case is provided with a fixture, the photographing direction of the photographing device or the like and the light projecting direction can be fixed, and the photograph can be taken without adjusting the light projecting device. In addition, since the infrared light emitting diode is used as the light emitting body, the durability time can be extended about 20 times compared to conventional light bulbs, etc., there is no need for frequent replacement work of the light emitting body, and further AC power supply If the infrared light emitting diode is made to emit light in response to the intermittent current supply, the heat generation of the infrared light emitting diode itself can be suppressed and the projection distance can be extended.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a sectional explanatory view showing an embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a wiring state of a light emitting body.

FIG. 4 is a perspective view showing another embodiment of the light emitting body.

FIG. 5 is a perspective view showing another embodiment of the present invention.

[Explanation of symbols]

 1 Outer Case 2 Power Cord 3 Through Hole 4 Substrate 5 Infrared Light Emitting Diode 6 Light Emitting Body 7 Resin Material 8 Supporting Member 9 Opening Hole A Light Emitting Assembly

Claims (9)

[Claims] 1. An outer case having an open front surface, and a light emitting body having a plurality of infrared light emitting diodes arranged on a substrate in association with a power source. The infrared light emitting diode of the light emitting body is directed forward. A light projecting device that fits inside an outer case. 2. The light projecting device according to claim 1, wherein a plurality of sets of light emitting aggregates in which a plurality of infrared light emitting diodes are wired in series are assembled as a light emitting body and disposed on a substrate. 3. The light projecting device according to claim 1, wherein an AC or DC power supply is used as the power supply. 4. The light projecting device according to claim 1, wherein an infrared light emitting diode having a wavelength range invisible to the naked eye is used. 5. The light projecting device according to claim 1, wherein a gallium arsenide-based material is used as the infrared light emitting diode. 6. The light projecting device according to claim 1, wherein a light emitter is positioned around a lens of a photographing camera or the like. 7. The light projecting device according to claim 1, wherein the outer case is provided with a cooling means. 8. The light projecting device according to claim 1, wherein the outer case is provided with a fixture. 9. The light projecting device of the present invention itself is housed in an outer case or the like and installed so as not to be seen from the outside.
The light projecting device according to item 8.