JP2001156302A - Infrared receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively concentrate an infrared ray from a light emitting element to a photodetector. SOLUTION: An infrared photodetector 10 is disposed toward an outward direction in the case 100 of an electrical equipment to receive an infrared signal from the outward direction. A reflecting plate 120 for concentrating the infrared ray to the infrared photodetector 110 is provided at the outside of the photodetector 110. The plate 120 has a function of electromagnetically shielding, and is formed in a substantially flared state gradually enlarged from the inward side of the case 100 toward the outward side. The inner peripheral surface of the plate 120 is formed as a reflecting surface to radially refract the ray received by the plate 120 from an LED 130 and to introduce the ray incident on the photodetector 110. Therefore, the region of the ray concentrated to a photodiode 112 is enlarged, and the ray can be effectively concentrated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared light receiving device for receiving an infrared signal from the outside by an infrared light receiving element in various electric appliances.

[0002]

2. Description of the Related Art An audiovisual (AV) device in which various signals are exchanged between a light emitting element and a light receiving element using infrared rays has been known. In addition,
Such a signal transmission system for AV equipment using infrared rays is called a so-called AV laser link. FIG. 9 is a block diagram showing an AV laser link used in such a camcorder system, and FIG. 10 is a sectional view showing the structure of a light receiving element of the AV laser link shown in FIG. In FIG. 9, a camcorder 10 transmits a captured video signal as an infrared ray by an LED (light emitting diode) 12 which is a light emitting element.

[0003] An IR receiver 20 for receiving a video signal from the camcorder 10 is connected to a monitor device such as a TV receiver, and sends a video signal received by infrared rays to the monitor device to reproduce a video. It is. The IR receiver 20 is provided with a photodiode 22 that constitutes an infrared light receiving element, receives infrared light transmitted by the LED 12, and converts the infrared light into an electric signal. As shown in FIG. 10, the photodiode 22 is sealed in a lens body 24. The lens body 24 is formed in a substantially cylindrical shape.
It is attached to the case body 20A of the IR receiver device 20 with its outer periphery surrounded by a cylindrical electromagnetic shield member 26.

[0004]

By the way, in the conventional IR receiver device 20 as described above, with the outer periphery of the lens body 24 being surrounded by the cylindrical electromagnetic shield member 26, the distal end face of the lens body 24 is cased. It is arranged so as to face the outside of the body 20A, and infrared rays are taken into the photodiode 22 from the tip surface of the lens body 24. For this reason, the region of the infrared light focused on the photodiode 22 is extremely limited, almost the same as the width of the light receiving region B of the photodiode 22, and the infrared light cannot be effectively focused. For this reason, it is difficult to increase the reach of infrared rays with respect to the output level of the light emitting element.

SUMMARY OF THE INVENTION It is an object of the present invention to effectively condense infrared light from a light emitting element to a light receiving element, to increase the reach in a limited range of the output level of infrared light, or to achieve a target arrival. It is an object of the present invention to provide an infrared light receiving device capable of reducing an output level with respect to distance and performing efficient IR reception.

[0006]

According to the present invention, in order to achieve the above object, an infrared light receiving element is disposed outwardly in a case of an electric device, and an infrared signal from the outside is received by the infrared light receiving element. In the infrared light receiving device, a substantially trumpet-shaped reflector provided on the case portion and gradually expanding from the inner side to the outer side of the case portion, and an inner end of the reflector And an infrared light receiving element provided at the center of the light receiving element.

In the infrared light receiving device according to the present invention, a substantially trumpet-shaped reflecting plate is provided on the outside of the infrared light receiving element so as to gradually expand from the inside to the outside of the case. The infrared signal from is reflected by the inner peripheral surface of the reflector,
The light is focused on the infrared light receiving element. Therefore,
Since the amount of infrared light condensed on the infrared light receiving element can be increased, the light receiving sensitivity of the infrared light receiving element can be improved, and the reaching distance can be increased in a limited range of the output level of infrared light. Or, conversely, it is possible to reduce the output level on the light emitting side with respect to the target reaching distance, and it is possible to perform efficient infrared reception.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the infrared ray receiving device according to the present invention will be described. FIG. 1 is a sectional view showing a basic structure of a reflector and an infrared light receiving element of the infrared light receiving device according to the embodiment of the present invention. The infrared light receiving device according to the present embodiment is configured such that an infrared light receiving element 110 is disposed outwardly on a case portion 100 of an electric device as described below, and the infrared light receiving element 110 receives an infrared signal from the outside. And a reflector 120 for condensing infrared rays on the infrared light receiving element 110.

The reflector 120 has a function of an electromagnetic shield, and is attached to a mounting hole 100A formed in the case 100 by, for example, solder.
The reflecting plate 120 is formed in a substantially trumpet shape gradually expanding from the inside to the outside of the case portion 100, and at least the inner peripheral surface is formed as a reflecting surface. The infrared light receiving element 110 is provided at the center of the inner end of the reflection plate 120. This infrared light receiving element 110 includes a photodiode 112 and a lens body 11.
4, and the lens body 114 is formed in a substantially columnar shape. In such an infrared light receiving device, infrared light received by the reflection plate 120 from the LED 130 is refracted in the inner diameter direction and is incident on the infrared light receiving element 110 as indicated by an arrow α in the drawing.

Therefore, the area of the infrared rays focused on the photodiode 112 becomes a region of the width A at the outer end of the reflector 120 which is larger than the width of the light receiving area B of the photodiode 112, and effectively collects the infrared rays. Can light. Therefore, it is possible to increase the reach of infrared rays with respect to the output level of the light emitting element. For example, when the maximum reach distance is set to 5 m at a point where the video S / N is 40 dB in the conventional AV laser link and this configuration is adopted, if the video S / N is set to 40 dB, The maximum reach can be extended to about 7m. If the maximum reach is set to 5 m, the video S / N is
It can be improved by about 3 dB.

Next, an example in which the infrared light receiving device of the present embodiment is applied to a specific electric device will be described. FIG. 2 is an exploded perspective view showing a configuration of an IR receiver device of an AV laser link to which the present embodiment is applied. FIG. 3 is a front view of the IR receiver device shown in FIG. 2, and FIG. 4 is a plan view of the IR receiver device shown in FIG. FIG. 5 is a side view of the IR receiver shown in FIG. 2, and FIG. 6 is a rear view of the IR receiver shown in FIG. FIG.
8 is a top view, a front view, a bottom view, and a side view showing a reflection plate of the infrared light receiving device provided in the IR receiver device shown in FIG. 2; FIG. 8 is a diagram showing a peripheral portion of the infrared light receiving device in the IR receiver device; It is a partial front view shown.

The IR receiver receives an infrared video signal transmitted from a camcorder (not shown) and transfers the video signal as a demodulated electric signal to a monitor (not shown). As shown in FIGS. 2 to 6, the IR receiver device includes a main board 210 on which various circuit components are arranged, a cabinet base 220 mounted on a lower surface of the main board 210, and an upper surface of the main board 210. Cabinet cover 230 to be installed
And a shield member 24 arranged at the front of the cabinet
0 and the IR arranged on the front surface of the shield member 240
Window member 250.

At the rear end of the main board 210, various connectors 212 are arranged.
20, an opening 224 of an outer wall 222 erected on the rear end side
From the outside. Further, a power switch 214 is provided on a side portion of the main board 210, and is exposed to the outside through cutout openings 226 formed in the cabinet base 220 and the cabinet cover 230.
Further, a plurality of cushion bodies 228 are mounted on the lower surface of the cabinet base 220 so as to obtain a stable mounting state.

The shield member 240 performs electromagnetic shielding around the photodiode 112, and is mounted in a gap between the front end of the cabinet base 220 and the front end of the cabinet cover 230. Then, at the center of the shield member 240, FIG.
Is provided. That is, in the present embodiment, the shield member 240 constitutes the case section 100 described above. The configuration of the infrared light receiving device 300 will be described later. Also,
In the vicinity of the infrared light receiving device 300 of the shield member 240, a power lamp 270 including an LED or the like is provided.

Further, the IR window member 250 is made of a dark-colored translucent resin material or the like, and is arranged outside the shield member 240 so that the shape and the like of the shield member 240 are difficult to see from the outside. Things. In the IR receiver device as described above, the cabinet cover 230 and the cabinet base 220 are overlapped on the upper and lower sides of the main board 210 and fastened and connected by four connecting screws 260, and a shield member is provided between the cabinet cover 230 and the cabinet base 220. 240 and IR window member 2
50 are integrally formed by fitting and holding.

Next, the infrared receiving device 300 provided in the above-described IR receiver will be described. As shown in FIG. 1, the infrared light receiving device 300 includes an infrared light receiving element 310 and a reflection plate 320, and is provided in a mounting hole 240 </ b> A formed in the shield member 240. The basic configuration of the infrared light receiving element 310 and the reflecting plate 320 is the same as that of the infrared light receiving element 110 and the reflecting plate 120 described above. However, the reflecting plate 320 of this example is formed by, for example, sheet metal processing of a steel plate, and has a nickel The reflecting surface is formed by plating.

The reflecting plate 320 of this embodiment has a cutout 324 in a part. This notch 324 is
It is formed corresponding to the power supply lamp 270 described above,
This is for preventing light emitted from the power supply lamp 270 from being blocked by the reflection plate 320. Further, the reflection plate 320 of this example is provided with a wire 280 for electromagnetic shielding.
The wire 280 is stretched around the outer end of the reflection plate 320 in a direction orthogonal to the optical axis of the infrared light receiving element 310, and is formed of a conductive wire such as metal.

In the above-described IR receiver, the infrared rays received by the trumpet-shaped reflection plate 320 can be effectively guided to the infrared light receiving element 310 by the infrared light receiving apparatus 300, and the sensitivity of the infrared light receiving element 310 can be improved. It is possible to extend the reaching distance and the like. Note that the infrared light receiving device of the present invention is not limited to the above-described IR receiver device, and can be widely applied to various electric appliances.

[0019]

As described above, in the infrared light receiving device of the present invention, a substantially trumpet-shaped reflector is provided outside the infrared light receiving element, and an infrared signal from the outside is reflected by the inner peripheral surface of the reflector. The light was condensed on an infrared light receiving element. Therefore, the amount of infrared light condensed on the infrared light receiving element can be increased, so that the light receiving sensitivity of the infrared light receiving element can be improved, and the reaching distance can be increased in a limited range of the output level of infrared light. Or, conversely, it is possible to reduce the output level on the light emitting side with respect to the target reaching distance, and it is possible to perform efficient infrared reception.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a basic structure of a reflection plate and an infrared light receiving element of an infrared light receiving device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a configuration of an IR receiver device of an AV laser link to which the embodiment shown in FIG. 1 is applied.

FIG. 3 is a front view of the IR receiver shown in FIG. 2;

FIG. 4 is a plan view of the IR receiver device shown in FIG.

FIG. 5 is a side view of the IR receiver device shown in FIG. 2;

FIG. 6 is a rear view of the IR receiver device shown in FIG. 2;

FIG. 7 is a top view, a front view, a bottom view, and a side view of a reflector provided in the IR receiver device shown in FIG. 2;

FIG. 8 is a partial front view showing a peripheral portion of an infrared light receiving device in the IR receiver device shown in FIG. 2;

FIG. 9 is a block diagram showing an AV laser link used in a conventional camcorder system.

FIG. 10 is a sectional view showing a structure of a light receiving element of the AV laser link shown in FIG.

[Explanation of symbols]

100 case body 100A mounting hole 110
... infrared light receiving element, 112 ... photodiode, 11
4 Lens body 120 Reflector 130 LE
D.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04Q 9/00 371

Claims (7)

[Claims] An infrared light receiving device in which an infrared light receiving element is arranged outward in a case portion of an electric device and receives an infrared signal from the outside by the infrared light receiving device. A substantially trumpet-shaped reflector that gradually expands from the inner side to the outer side of the portion, and an infrared light receiving element provided at the center of the inner end of the reflector. An infrared light receiving device characterized by the above-mentioned. 2. The infrared light receiving device according to claim 1, wherein the reflection plate and the infrared light receiving element are provided on an electromagnetic shield member forming a part of a case of the electric device. 3. The electric device according to claim 1, wherein a dark-colored translucent member is arranged outside the electromagnetic shield member, so that the reflection plate and the infrared light receiving element are hardly visually recognized from the outside. Infrared receiver. 4. The infrared light receiving device according to claim 1, wherein the electric device is a receiver device that receives a video signal by using an infrared light receiving element. 5. The infrared light receiving apparatus according to claim 1, wherein the reflection plate has a reflection surface formed by plating on an outer surface of a sheet metal. 6. The infrared light receiving device according to claim 1, wherein the reflection plate has an electromagnetic shield wire stretched on an outer end thereof in a direction orthogonal to an optical axis of the infrared light receiving element. apparatus. 7. The infrared light receiving device according to claim 1, wherein the infrared light receiving element is obtained by sealing a photodiode with a lens body.