JP3450139B2 - Light receiving device and discharge lamp device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used, for example, in a discharge lamp device such as a fluorescent lamp device, receives infrared rays sent from a remote control transmitter, and controls the lighting of the discharge lamp (lighting,
The present invention relates to a light receiving device suitable for turning off, dimming, etc.) and a discharge lamp device using the same.

[0002]

2. Description of the Related Art Conventionally, an infrared ray receiving device provided alongside a discharge lamp such as a fluorescent lamp has a casing 11 made of a resin such as white polypropylene as shown in FIG.
Is provided with an opening 11a on its upper surface, a filter 12 for cutting light having a wavelength of, for example, 1000 nm or more is attached to the opening 11a, and electromagnetic noise from an element constituting an inverter or the like incorporated in the discharge lamp device is further provided. In order to prevent this, a magnetic metal electromagnetic shield case 13 that shields from electromagnetic waves is provided below the filter 12,
An infrared sensor 14 that detects infrared rays is provided in the electromagnetic shield case 13. Here, an opening 13a is formed on the upper surface of the electromagnetic shield case 13, and infrared rays incident on the opening 13a are detected by the infrared sensor 14.

However, the infrared light receiving device J having such a structure has the following problems. First, the conventional casing 11 is formed of a resin such as polypropylene from the viewpoint of resistance to ultraviolet rays and good workability, but since infrared rays penetrate through the resin such as polypropylene, the casing 11 may have an electromagnetic wave, for example. Shield case 13
In addition, it is necessary to provide the infrared sensor 14 for detecting infrared rays in the electromagnetic shield case 13, which causes a problem that the device becomes complicated and becomes large in size.

Further, as shown in FIG. 4, the casing 11
Infrared rays from other than the remote control transmitter that entered from the side of the
1 may directly reach the infrared sensor 14 and block the incidence of a signal from the remote control transmitter, or noise may be added to the signal waveform from the remote control transmitter to change the waveform, resulting in malfunctions. was there.

Further, the infrared rays incident from the side surface of the casing 11 are reflected by the wire mesh structure 13a provided in the electromagnetic shield case 13 and reach the infrared sensor 14 like a signal from the remote control transmitter to cause an error. There was a problem that it caused the operation.

The above-mentioned problems are remarkable especially when the discharge lamp device is placed in a low temperature environment. This problem will be described below. As shown in (a) of FIG.
The irradiation spectrum at the time of lighting of the discharge lamp at the temperature near is distributed intermittently in the range of about 800 to 1200 nm, and this distribution exists in the reaction region of the spectral sensitivity of the infrared sensor shown in (c) of FIG. is doing.

That is, as shown in FIG. 5B, the spectrum of the light emitting diode which emits infrared rays of the remote control transmitter is 900 to 1000 nm, so that 900
If a filter (or lens) that can cut spectral light of less than 1000 nm and more than 1000 nm is used, obstacle light from a discharge lamp in a low temperature environment can be largely prevented,
In the current structure, infrared rays from the discharge lamp that enter from the side surface of the casing that does not pass through the filter may be reflected by the wire mesh structure portion 13a of the electromagnetic shield case 13 and enter the infrared sensor, which adversely affects the operation. It was.

As described above, due to the influence of infrared rays emitted from the discharge lamp at a low temperature of around 0 ° C., the signal from the remote control transmitter cannot be processed accurately, and the temperature of the discharged discharge lamp rises after a while. Finally, the signal from the remote control transmitter could be processed normally.

Therefore, it is an object of the present invention to provide a novel and epoch-making infrared ray receiving device which can be operated quickly and accurately even when the temperature of the discharge lamp is low and which is excellent in reliability and performance. .

[0010]

In order to solve the above-mentioned problems, a light receiving device of the present invention comprises a sensor for detecting infrared rays arranged in a casing that shields electromagnetic waves, and an upper surface of the casing. Part of it is formed by an electromagnetic shield net that has a reflection surface that reflects infrared rays from the lateral direction and makes them incident on the sensor, and transmits infrared rays of a predetermined wavelength between the electromagnetic shield net and the sensor. It is equipped with a filter.

Further, in the discharge lamp device of the present invention, the above-mentioned light receiving device is provided together with the discharge lamp, and lighting of the discharge lamp is controlled (lighting, extinguishing, dimming, etc.) by a detection signal from a sensor of the light receiving device.
It is characterized in that it is made to do.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment according to the present invention will be described in detail. The light receiving device S1 shown in FIG. 1 is provided alongside the discharge lamp L in the discharge lamp device F as shown in FIG. 2, and is installed, for example, near the center of the annular discharge lamp L. It is provided in order to receive the infrared rays emitted from the remote control transmitter R and control the operations such as lighting, extinguishing and dimming of the discharge lamp. The discharge lamp L is shown in cross section in FIG. 2, and a part thereof is omitted.

As shown in FIG. 1, an opening 1a is formed on the upper surface of a casing 1 made of a magnetic metal that shields electromagnetic waves. The opening 1a has a large number of square openings of about 2 mm × 2 mm. Formed net-like electromagnetic shield net 5
Is provided. That is, as shown,
A part of the upper surface of the casing 1 is formed of an electromagnetic shield net. The electromagnetic shield network 5 serves as an incident unit that reflects light that is obliquely incident from the outside so that the light is effectively incident on the inside of the casing 1.

A sensor 2 for detecting infrared rays is arranged on the control circuit board 3 in the casing 1. Here, the sensor 2 is configured by covering a photodiode made of pin type amorphous silicon, which is a detection means, with an external cover 2a. Further, it has a wide spectral sensitivity as shown in FIG. 5C, and is configured to control the lighting of the discharge lamp L by the detection signal from the photodiode.

A filter 4 is attached to the upper portion of the electromagnetic shield network 5, that is, outside the upper portion of the casing 1. The filter 4 is made to transmit light having a wavelength of 900 to 1000 nm so that infrared rays can be transmitted therethrough. It is possible to accurately detect the colorant, and the colorant or the like is mixed in the glass or film, or the colorant or the like is vapor-deposited or coated. The filter may be arranged on the light receiving side of the incident means.

Next, the light receiving device S configured as described above.
The operation of No. 1 will be described. As shown in FIG. 2, the distance from the light receiving device S1 is 2 to 3 meters (side light distance 2 to 2).
The remote control transmitter R is disposed at a height of about 1 to 2 meters from the light receiving device S1 at a height of 3 meters. When the temperature around the discharge lamp L is about 0 ° C., as shown in FIG. 5A, the irradiation spectrum of the discharge lamp L has a wavelength of about 800 to
It occurs intermittently in the range of 1000 nm.

In such a situation, when the infrared ray r is emitted from the remote control transmitter R, the infrared ray which is directly incident on the opening 1a of the casing 1 passes through the filter 4 and reaches the sensor 2 so that the infrared ray r is transmitted. Detected. At this time, the filter 4 cuts off light of a predetermined wavelength generated from the discharge lamp L. In addition, the effective infrared ray r of the remote control transmitter R from an oblique direction is reflected by the electromagnetic shield network 5 and reaches the sensor 2. As a result, even under a low temperature environment of about 0 ° C., the signal from the remote control transmitter R can be accurately sensed in about 1 to 2 minutes, and normal operation becomes possible. Next, for comparison,
When the light receiving device J of the conventional structure shown in FIG. 4 was also operated under the same conditions, it took about 3 minutes to operate correctly.

Next, another embodiment will be described. Figure 3
As shown in FIG. 5, the light receiving device S2 may be used as the incident means in which the portion of the electromagnetic shield net 5 forming the net-like structure is formed to have a triangular cross section to form the reflecting surfaces 5a and 5b. With this configuration, effective infrared rays from the lateral direction of the remote control transmitter can be effectively taken in.

Instead of using the filter 4, the light receiving surface of the outer cover 2a of the sensor 2 may be formed as a filter, or the casing 1 itself may be a filter that allows a specific electromagnetic wave to pass therethrough. By doing so, not only the filter becomes unnecessary, but also a more simple and compact light receiving device is realized. When an electromagnetic shield film is used as the electromagnetic shield material, the electromagnetic shield film may be directly coated with the filter. Thereby, the structure can be further simplified.

In addition, although a preferred example in which the light receiving device is used as a discharge lamp device has been described in the present embodiment, the present invention is not limited to this and can be applied as a light receiving device for various well-known electric devices. Further, this light receiving device is not limited to one that detects only infrared rays, and may be configured to detect light of a specific wavelength. Further, the incident means is not limited to the above embodiment, the network structure may be configured to have a hemispherical shape, and is not limited to the network structure, and its shape, material, etc. may be appropriately selected. It can be changed and implemented.

[0021]

As described above, according to the light receiving device of the present invention, for example, a simple structure in which a sensor for detecting infrared rays is provided at least in a casing for shielding infrared rays is simpler than the conventional structure. In addition, the size can be greatly reduced.

Further, the electromagnetic shield net formed on a part of the upper surface of the casing makes it possible to introduce the signal from the lateral direction from the remote control transmitter into the casing.
It is possible to provide a light receiving device with higher reliability than before.

Further, when the light receiving device of the present invention is provided in the discharge lamp device, malfunctions due to infrared rays generated from the discharge lamp can be prevented as much as possible even if the discharge lamp device is placed in a low temperature environment. It is possible to provide a light receiving device having excellent reliability.

[Brief description of drawings]

FIG. 1 is a partial sectional view illustrating an embodiment of a light receiving device according to the present invention.

FIG. 2 is a schematic diagram illustrating a discharge lamp device of the present invention.

FIG. 3 is a partial sectional view illustrating another embodiment of the present invention.

FIG. 4 is a partial cross-sectional view illustrating a conventional light receiving device.

FIG. 5 is a diagram for explaining emission spectra of a discharge lamp and a light emitting diode of a remote control transmitter and spectral sensitivity of an infrared sensor.

[Explanation of symbols]

1: Casing 2: Sensor 3: Control circuit board 4: Filter 5: Electromagnetic shield network S1, S2: Light receiving device F: Discharge lamp device

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Claims (2)

(57) [Claims] To 1. A casing for shielding electromagnetic waves, infrared
It is equipped with a sensor that detects lines, and a part of the upper surface of the casing reflects infrared rays from the lateral direction.
Electromagnetic seal with a reflective surface that allows light to enter the sensor
Of the electromagnetic shield net and the sensor.
During the light-receiving device comprising providing a filter that transmits infrared radiation of a predetermined wavelength. 2. A discharge lamp device, wherein the light receiving device according to claim 1 is provided along with a discharge lamp, and lighting of the discharge lamp is controlled by a detection signal from the sensor of the light receiving device.