JP2000295678A - Remote control light receiving module - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the occurrence of remote control operation failure immediately after lighting a fluorescent lamp. In a remote control light-receiving module in which a light-receiving element is mounted in a case facing a light-receiving window and an interference filter is mounted so as to cover the light-receiving window, the light incident on the interference filter is It is characterized by including a light shielding plate 14 that blocks light whose incident angle is smaller than a predetermined incident angle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote control light-receiving module suitable for a device with a remote control, especially a fluorescent lamp with a remote control.

[0002]

2. Description of the Related Art In a fluorescent lamp with a remote controller, as shown in FIG. 7, a remote controller light receiving section 101 is arranged so that a light receiving window is directed downward with respect to a ceiling 100. In addition, fluorescent lamps are mainly of a type that is covered with a shade 103 so that the fluorescent lamp 102 does not directly enter the eyes of the user. In a type that is covered by such a shade 103, Due to the reflection by the shade 103, the illuminance of the light receiving surface becomes 5000 to 10000 lx.
In order to eliminate the influence of the reflected light, a material (visible light cut filter) having a characteristic of passing infrared light (having a center wavelength of about 940 nm) used for remote control transmission but blocking visible light is arranged in the light receiving path. That is being done. However, the optical noise generated from the fluorescent lamp 102 is also present in the infrared region, for example, when the center wavelength is 912n.
Light of m, 922 nm, 965 nm, and 1013 nm has been regarded as a problem. Among them, the center wavelength is 912 nm, 922
nm and 965 nm are generated immediately after the fluorescent lamp 102 is turned on until it is warmed up and disappear thereafter.
The operation immediately after lighting is adversely affected. On the other hand, when the center wavelength is 1
Since the light of 013 nm increases after the fluorescent lamp 102 is warmed, it adversely affects the operation after the fluorescent lamp is started.

In order to remove the above-mentioned light noise in the infrared region, for example, as shown in Japanese Patent Application Laid-Open No. Hei 6-251616, a design has been made to selectively transmit light of a predetermined wavelength. It has been proposed to place an interference filter in the light receiving path.

[0004] The interference filter has an optical characteristic in which the transmission wavelength shifts to the shorter wavelength side as the incident angle increases, so that the light at the incident angle (about 30 °) in a general use state of the infrared remote controller is used as a reference. The optical design is such that the transmitted wavelength matches the wavelength used by the remote controller (around 940 nm). As a result, an interference filter designed to selectively transmit light having a wavelength of about 965 nm when the incident angle is about 0 ° is used.

[0005]

In the interference filter set as described above, the center wavelengths incident at about 30 ° are 912 nm, 922 nm, 965 nm, and 1013 nm.
Can be removed, but the optical noise having a center wavelength of 965 nm incident from the vertical direction (the incident angle is 0 °) cannot be sufficiently removed. Due to the light noise, a malfunction of the remote control may occur immediately after the fluorescent lamp is started. Such optical noise did not cause much problem when the illuminance of the fluorescent lamp was not high, but became a major cause of malfunction of the remote control as the illuminance of the fluorescent lamp increased. In view of the above, an object of the present invention is to reduce the occurrence of remote control operation failure. Another object of the present invention is to reduce occurrence of remote control operation failure immediately after lighting of a fluorescent lamp.

[0006]

According to a first aspect of the present invention, there is provided a remote control light-receiving module according to the first aspect of the present invention, wherein a light-receiving element is mounted in a case so as to face the light-receiving window, and the light-receiving element covers the light receiving window. In a remote control light receiving module equipped with a filter, an incident light restricting means for blocking light having an incident angle smaller than a predetermined incident angle out of light incident on the interference filter is provided.

According to a second aspect of the present invention, there is provided a remote control light-receiving module, wherein a light-receiving element in which a light-receiving chip is resin-molded is mounted in a case with the light-receiving element facing the light-receiving window and covers the light-receiving window. In a remote control light receiving module equipped with a filter, the shape of the mold resin is set so that light within a predetermined incident angle range of light incident on the light receiving element after passing through the interference filter is preferentially incident on the light receiving chip. It is characterized by having done.

According to a third aspect of the present invention, there is provided a remote control light receiving module, wherein a light receiving element in which a light receiving chip is resin-molded is mounted in a case with the light receiving element facing the light receiving window and covers the light receiving window. In a remote control light-receiving module equipped with a filter, a plurality of light-receiving elements are arranged so that light of a predetermined incident angle range is preferentially incident on the light-receiving chip out of light incident on the light-receiving element after passing through the interference filter. It is characterized by comprising a combination of elements and arranging a plurality of light receiving elements in different directions.

According to a first aspect of the present invention, there is provided a remote control light receiving module according to any one of the first, second, and third aspects, wherein the light receiving element includes a light receiving chip. It is characterized in that a material for shielding visible light is mixed with a resin to be molded.

According to a fifth aspect of the present invention, there is provided a remote-control light-receiving module according to claim 5, wherein the light-receiving element faces the light-receiving window and is mounted in a case. An incident light restricting means for blocking light whose angle is smaller than a predetermined incident angle is provided.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings. FIG. 1 is a sectional view of the remote control light receiving module 1, and FIG. 2 is a perspective view thereof.

The remote control light receiving module 1 is housed in a case 5 with a light receiving unit 2 and an interference filter 4 arranged so as to cover a light receiving window 3 of the unit 2 positioned.

The light receiving unit 2 has a structure in which the light receiving element 6 is connected to a substrate 7, and the substrate 7 is arranged and fixed in the shield case 8 so that the light receiving element 6 is desired on the light receiving window 3 of the shield case 8. Then, the lead pin 1 connected to the substrate 7
0 is led out of the shield case 8. The light receiving element 6 is formed by resin-molding a light receiving chip 11 such as a PIN photodiode mainly composed of silicon with a translucent resin 12. And this light receiving element 6
By mixing a dye or the like that absorbs light having a wavelength shorter than about 850 nm into the mold resin 12, a structure having a visible light cutting function can be provided. Light receiving element 6
When a device having no visible light cut function is used, a configuration in which a visible light cut filter is arranged above or below the interference filter 4 can be adopted.

The interference filter 4 selectively transmits light of a desired wavelength by utilizing light interference. A metal film, a non-metal film, or a multilayer film composed of a combination thereof is deposited on the surface of the substrate glass. It is constituted by doing. As shown by the line A in FIG.
Optically designed so as to selectively transmit light of 0 to 965 nm is used. The characteristic indicated by the line A is a case where light is incident perpendicularly (when the incident angle θ is 0 °) on the interference filter. The characteristic of the interference filter is that the transmission wavelength increases as the incident angle of the light increases. Shifts to the short wavelength side. The characteristic shown by the line B in the figure shows the case where the incident angle is 45 °.

The case 5 has a configuration in which the interference filter 4 is sandwiched and fixed between the upper surface of the case 5 and the upper surface of the light receiving unit 2. The light receiving window 9 on the upper surface of the case 5 is formed slightly larger than the light receiving window 3.

The incident light limiting means 13 is provided on the upper part of the case 5.
Is arranged. The incident light restricting means 13 is for restricting the incident angle θ of light passing through the interference filter 4 and the light receiving window 3 and entering the light receiving unit 2. Is a predetermined value, and in this example, a structure that cuts off at or below about 40 ° is cut off. Incident light limiting means 13 is a light shielding member similar in shape to light receiving window 9,
In this example, a circular light shielding plate 14 is held by a holding member 15 at a concentric position above the light receiving window 9. The light-shielding plate 14 is colored white on the front surface and black on the back surface. By coloring the surface of the light shielding plate 14 in a white color, the light shielding plate 14 is made inconspicuous when the light shielding plate 14 is visible through a shade. Further, by making the back surface of the light-shielding plate 14 black, the light absorption at the back surface portion of the light-shielding plate 14 is enhanced to prevent unnecessary reflection of light, particularly, light reflection toward the light receiving unit 2. I have. Here, the light shielding plate 14, the holding member 15
Can be formed integrally with the case 5 or can be formed as a separate member, but is preferably integrally formed with the case 5 using a resin or the like in terms of ease of handling. Alternatively, the case 5 may be made of a light-transmitting member, and a portion corresponding to the light-shielding plate 14 may be formed by attaching a light-shielding member, painting a light-shielding film, or the like. Further, the case 5 and the light shielding plate 14 may be formed by using a part of the shield case 8.

Light receiving module 1 configured as described above
The light shielding plate 14 blocks light having a small incident angle θ, blocks light having a large incident angle θ by the cases 5 and 8 (the periphery of the light receiving windows 3 and 9), or reflects the light from the interference filter 4. , The angle of light incident on the interference filter 4 is 30
° to 60 ° can be regulated. in this way,
By regulating the angle of the light incident on the interference filter 4, the transmission characteristic of the interference filter 4 can be slightly shifted to the short wavelength side, and the transmission center wavelength can be set to about 940 nm. Therefore, light of 912, 920, 965, and 1013 nm, which is inclined to enter the interference filter 4, is reduced by the interference filter 4, and optical noise of about 965 nm, which is to enter the interference filter 4 perpendicularly, is shielded by the light shielding plate 1.
4 can block. In addition, by regulating the angle of light incident on the interference filter 4 and the light receiving unit 2, the amount of light incident on the light receiving element 6 can be reduced to half or less, and optical noise can be reduced at the same time.

Incidentally, instead of the selective removal of the optical noise by the combination of the interference filter 4 and the light shielding plate 14, the selective removal of the optical noise by the combination of the interference filter 4 and the light receiving element 6 can be performed. FIG. 3 shows the directional characteristics of the light receiving unit 2 required to perform the same function as the light shielding plate 14. In order to have such directional characteristics, for example, as shown in FIG. 4, a plurality of light receiving elements 6a and 6b are used as the light receiving elements 6, and the angle of the light receiving surface of each of the light receiving elements 6a and 6b is inclined around 45 °. Thus, these elements can be arranged so as to be turned to each other. in this case,
The electrical connection between the light receiving elements 6a and 6b can be a wired-OR connection so as to be common to the cathodes.
Further, as shown in FIG. 5, one light receiving element 6c is used as the light receiving element, and the shape of the resin mold portion 12c is selectively and efficiently changed as shown in FIG. The shape can be set so as to converge light on the chip 11c.

By using the light receiving unit 2 having such characteristics in combination with the interference filter 4 shown in FIG. 1, it is possible to perform the same function as the light receiving module 1 shown in FIG. Here, if the light receiving unit 2 shown in FIGS. 4 and 5 is used as the light receiving unit 2 shown in FIG. 1, the influence of the optical noise on the light receiving module 1 can be further reduced.

Light receiving module 1 constructed as described above
Is used by attaching it to the main body of the fluorescent lamp as shown in FIG. 7 so that its light receiving surfaces 3, 9 face downward.

As the light receiving unit 2, the case where the light receiving element 6 is connected to the substrate 7 and the light receiving element 6 is housed in the shield case 8 is exemplified. May be used.

As in the above embodiment, the incident light restricting means 1
The combination of the incident light restricting means 13 and the interference filter 4 or the combination of the incident light restricting means 13 and the visible light is most effective for reducing the optical noise. Even a combination of two cut filters is effective in reducing optical noise. Also, only the incident light restricting means 13 is effective in reducing optical noise.

[0023]

As described above, according to the remote control light-receiving module of the present invention, it is possible to reduce the influence of optical noise and improve the operability of the remote control.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a remote control light receiving module.

FIG. 2 is a perspective view of the same embodiment.

FIG. 3 is a directional characteristic diagram showing a relationship between an angle and relative light sensitivity in the embodiment shown in FIGS. 4 and 5;

FIG. 4 is a sectional view showing an embodiment of the light receiving unit.

5A and 5B are a cross-sectional view and a schematic view showing another embodiment of the light receiving unit.

FIG. 6 is a diagram illustrating optical characteristics of an interference filter.

FIG. 7 is an explanatory view schematically showing an installation state of a fluorescent lamp with a remote control.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 remote control light receiving module 2 light receiving unit 3 light receiving window 4 interference filter 5 case 6 light receiving element 8 shield case 9 light receiving window 11 light receiving chip 14 light shielding plate

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H05B 37/02 // F21V 23/04 (72) Inventor Susumu Maeda 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture F-term in Tottori Sanyo Electric Co., Ltd. (reference)

Claims (5)

[Claims] 1. A remote control light receiving module in which a light receiving element is mounted in a case facing a light receiving window and an interference filter is mounted so as to cover the light receiving window. A remote control light receiving module characterized by comprising incident light restricting means for blocking light smaller than a predetermined incident angle. 2. A remote control light receiving module in which a light receiving element in which a light receiving chip is resin-molded faces a light receiving window and is mounted in a case, and an interference filter is mounted so as to cover the light receiving window. A remote control light receiving module, wherein the shape of the mold resin is set so that light within a predetermined incident angle range of light incident on the light receiving element is preferentially incident on the light receiving chip. 3. A remote control light receiving module in which a light receiving element in which a light receiving chip is resin-molded faces a light receiving window and is mounted in a case, and an interference filter is mounted so as to cover the light receiving window. Of the light incident on the light receiving element, the light receiving element is configured by a combination of a plurality of light receiving elements so that light in a predetermined incident angle range is preferentially incident on the light receiving chip, and the direction of the plurality of light receiving elements is changed. A remote control light receiving module characterized by being arranged differently from each other. 4. The light-receiving element according to claim 1, wherein a material for blocking visible light is mixed with a resin for molding the light-receiving chip. Remote control light receiving module. 5. A remote control light receiving module in which a light receiving element faces a light receiving window and is mounted in a case, out of the light incident on the light receiving window, incident light restricting means for blocking light having an incident angle smaller than a predetermined incident angle. A remote control light receiving module comprising: