JP2000133821A - Remote control light-receiving unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable easy attachment to the inside of a television receiver, in a prescribed state. SOLUTION: In a light-receiving main body part 11 wherein a photodiode 11b is mounted on a lead frame 11a and molded by a resin mold part 11d, a lens part 11d which protrudes semispherically is formed in a resin mold part 11c which faces the photodiode 11b. The light-receiving main body part 11 is covered with a shielding case 12, to which a light guide part 13 constituted of translucent plastic is attached in a unified body. The light guide part 13 is equipped with a lens cap part 13b covering the lens part 11d of the resin mold part 11c. A light guide main body part 13c of a columnar type in a state concentric to the lens cap part 13b is so installed, that the tip surface is made to abut against a light-receiving window 21b which is irradiated with a signal from a remote control transmitter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a television (television),
Attached to various electric appliances such as VTR (video tape recorder), audio component, air conditioner,
The present invention relates to a remote control light receiving unit adapted to receive an infrared signal transmitted from a remote controller (remote control transmitter).

[0002]

2. Description of the Related Art Various electric appliances such as TVs (televisions), VTRs (video tape recorders), audio components, and air conditioners are controlled by infrared signals transmitted by remote control transmitters. FIG. 6 is a schematic configuration diagram showing the internal structure of a television set that can be controlled by a remote controller. An infrared signal transmitted from the remote control transmitter passes through a light receiving window 32 provided on a front panel 31 of the television 30, and is a columnar light provided horizontally between the light receiving window 32 and the remote control light receiving unit 33. The light is radiated to the remote control light receiving unit 33 through the guide 34.

In the remote control light receiving unit 33, a photodiode as a light receiving element is mounted on a lead frame attached to a substrate 35, and is molded by a resin molding portion 33a. Then, the resin mold portion 33a
The surface facing the photodiode in is a hemispherically protruding lens portion 33b.
3 b faces the end face of the light guide 34.

[0004] The infrared signal having passed through the light guide 34 is applied to a lens portion 33b of the resin mold portion 33a, and is received by a photodiode in the resin mold portion 33a.

[0005]

In the television 30 having such a configuration, one end face of the light guide 34 is abutted against the light receiving window 32 of the front panel 31, and the light guide 34 is horizontally arranged. The substrate 35 to which the remote control light receiving unit 33 is attached is mounted at a predetermined position inside the television 30. In this case, when mounting the substrate 35 at a predetermined position in the television 30, it is necessary to position the lens portion 33 b of the remote control light receiving unit 33 and the light guide 34 so that they are concentric. However, since an appropriate space is provided between the light guide 34 and the remote control light receiving unit 33, the lens portion 33b of the remote control light receiving unit 33
There is a problem that it is not easy to position and fix the light guide 34 and the light guide 34.

When the light guide 34 and the lens portion 33b of the remote control light receiving unit 33 are not arranged concentrically, the amount of light received by the photodiode is reduced by the directivity of the infrared signal entering the light guide 34 from the light receiving window 32. There is a possibility that it will be significantly reduced.

An object of the present invention is to solve such a problem. It is an object of the present invention to easily arrange a predetermined position inside an electric appliance or the like, and furthermore, to receive an infrared light signal to be irradiated. It is an object of the present invention to provide a remote control light receiving unit that does not have a possibility of reducing the image quality.

[0008]

According to the present invention, there is provided a remote control light receiving unit in which a light receiving element mounted on a lead frame is molded by a resin mold portion, and a hemispherically projecting lens is formed on the resin mold portion facing the light receiving element. A light receiving body provided with a light receiving body, a cylindrical lens cap that is integrally attached to the light receiving body, and covers a lens part of the light receiving body, and receives a signal from a remote control transmitter. And a light guide main body having a columnar shape whose front end face abuts a light receiving window, and a light guide part formed concentrically and integrally with translucent plastic.

The light receiving body is covered by a shield case integrated with the light receiving body, and a light guide is integrally attached to the shield case.

[0010] The light guide body of the light guide is hollow. The resin mold portion and the light guide portion of the light receiving main body are integrally formed.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a television to which a remote control light receiving unit of the present invention is mounted. The television 20
The CRT 22 is accommodated in the TV case 21, and the display screen of the CRT 22 faces the front of the TV case 21. Remote control receiving unit 10 of the present invention
Is disposed below the cathode ray tube 22 in the television case 21.

FIG. 2 is a side view of the remote control light receiving unit 10, and FIG. 3 is a front view thereof. The remote control light receiving unit 10 includes a light receiving main body 11 attached to a substrate 23 (see FIG. 1), a shield case 12 covering the light receiving main body 11, a front case 21a of the shield case 12, and a television case 21. And a light guide portion 13 disposed in a horizontal state. The light guide section 13 is integrally attached to the shield case 12, and one end face of the light guide section 13 is abutted against a light receiving window 21 b provided on a front panel 21 a of the case 21.

Light receiving body 1 of remote control light receiving unit 10
1 includes a lead frame 11 attached to a substrate 23.
a photodiode 11b which is a light receiving element mounted on a
Is provided. Also, the lead frame 11a has
An integrated circuit section including an amplifier circuit and the like are also mounted, and the photodiode 11b, the integrated circuit section, and the like are molded by a resin molding section 11c. The resin mold portion 11c is provided with a lens portion 11d whose surface facing the photodiode 11b projects hemispherically. A part of the lead frame 11a is
1c.

Resin molded portion 11c of light receiving main body 11
Is covered by a metal shield case 12 integrated with the resin mold portion 11c. A part of the lead frame 11 a protruding from the resin mold portion 11 c in the light receiving main body 11 penetrates the side surface of the shield case 12 and protrudes from the shield case 12. The lens case 1 is provided on the surface of the shield case 12 that covers the surface of the resin mold 11c on which the lens unit 11d is provided.
A circular opening from which 1d protrudes is provided. A pair of recesses 12c are provided on the outer surface of each side surface 12b of the shield case 12 extending along the longitudinal direction at appropriate intervals in the longitudinal direction.

The light guide 13 is integrally attached to the shield case 12. Light guide part 1
3 is a cover part 13a that covers the surface of the shield case 12 provided with an opening from which the lens part 11a protrudes.
A cylindrical lens cap portion 13b that covers the lens portion 11d protruding from the opening of the shield case 12, and a cover portion 13a that is concentric with the lens cap portion 13b.
And a column-shaped light guide main body 13c extending linearly in a direction away from the main body. These cover parts 13
a, the lens cap 13b and the light guide body 13c are integrally formed of a light-transmitting plastic such as acrylic resin.

The cover 13a of the light guide 13 is
The shield case 12 is formed in a hollow box shape to be fitted to a side portion near the protruding surface of the lens portion 11d, and the lens portion of the shield case 12 is abutted against the protruding surface of the lens portion 11d. An opening to be fitted to 11d is formed. Shield case 12
On the inner surface of each side surface 13d of the cover portion 13a along each side surface 12b extending in the longitudinal direction, a pair of engagements respectively engaged with a pair of recesses 12c provided on each side surface 12b of the shield case 12 respectively. Claws 13e are provided respectively. And each engagement claw 13e is
The light guide 13 is integrally attached to the shield case 12 by engaging with each of the recesses 12 c of the shield case 12.

A cylindrical lens cap portion 13b is provided on the periphery of an opening provided in the cover portion 13a so as to fit the lens portion 11d so as to surround the lens portion 11d. The lens cap 13b is
The lens unit 11d is concentric with the lens unit 11d.
d so that an appropriate space is formed around d.
It has an inner diameter slightly larger than the outer diameter of 1d.

The end face of the lens cap section 13b located on the far side of the light receiving main body section 11 is closed at an appropriate distance from the lens section 11d fitted therein. A light guide body 13c formed of a solid cylindrical shape by optical plastic is provided concentrically with the lens cap 13b. The distal end face of the light guide main body 13c abuts a light receiving window 21b provided on a front panel 21a of the television case 21.

The remote control light receiving unit 1 having such a configuration
0, when an infrared signal transmitted from the remote control transmitter is irradiated on the light receiving window 21b of the front panel 21 of the television 20, the infrared signal passes through the light guide main body 13c and the lens section of the light receiving main body 11 Irradiated at 11d. Since an air layer is provided around the lens portion 11d, the infrared signal applied to the lens portion 11d is refracted and reliably received by the photodiode 11b. Thereby, the television 20 is controlled.

The light guide portion 13 of the remote control light receiving unit 10 is integrally formed of a transparent plastic and is integrally attached to the shield case 12 that covers the light receiving main body portion 11. With the detached light receiving main body 11 attached to the substrate 23, the light receiving main body 11 can be easily positioned with respect to the light receiving main body 11 covered with the shield case 12, and can be attached to a predetermined position in the television case 21.

The light guide main body 13c of the light guide 13 does not need to be entirely solid, and as shown in FIG. 4, is hollow except for an end face portion which abuts on the light receiving window 21b. It may be. In this case, the deterioration of the infrared signal passing through the light guide body 13c is suppressed, and the photodiode 11b of the light receiving body 11 can reliably receive the infrared signal.

FIG. 5 is a side view showing still another example of the embodiment of the remote control light receiving unit. In this remote control light receiving unit 10, the shield case 12 is not provided, and the resin mold portion 11c of the light receiving main body 11 and the light guide portion 13 are integrally formed. The light guide portion 13 is integrated with the cover portion 13a not provided and the lens cap portion 13b abutted on the surface of the resin mold portion 11c on which the lens portion 11d is provided. An opening 13f is provided on each of the left and right side surfaces of the lens cap 13b so as to face each other. Then, the lens cap portion 13b
Light guide body 13 having a solid cylindrical shape
a is provided integrally and concentrically.

Remote control light receiving unit 1 having such a configuration
0 indicates that the light guide portion 13 is formed at the same time when the photodiode 11b and the like mounted on the lead frame 11a are molded with resin. In this case, a pair of inner dies for forming the hemispherical lens portion 11d of the resin mold portion 11c is used. The pair of inner dies are brought into contact with each other to form a lens unit 1 therein.
A hemispherical space corresponding to 1d is formed. An outer mold corresponding to the outer shape of the resin mold portion 11c and the light guide portion 13 is arranged around the pair of inner molds, and the outer mold and the inner mold are arranged in the space between the outer mold and the inner mold. A translucent plastic is injection-molded in the space inside the mold. Then, when the translucent plastic is cured to a predetermined shape,
The outer die is removed, and the pair of inner dies is separated from each other, so that the lens cap portion 13b of the light guide portion 13 is removed.
Each of the openings is removed through the opening 13f.

The lens cap 1 of the light guide 13
Since an air layer is provided around the lens portion 11d disposed in the lens cap 3b, the infrared signal that has passed through the light guide main body portion 13a of the light guide portion 13 and entered the lens cap portion 13b is the The light is refracted by the air layer and is surely received by the photodiode 11b molded in the resin mold portion 11c.

[0026]

As described above, in the remote control light receiving unit of the present invention, since the resin molded portion in which the light receiving element is molded and the light guide portion are integrally attached,
With the light receiving element and the light guide part positioned,
It can be securely and easily attached to a predetermined position inside an electric appliance or the like. Therefore, there is no possibility that the amount of infrared light received by the light receiving element is reduced, and the sensitivity of the remote control light receiving unit is significantly improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a television on which a remote control light receiving unit of the present invention is mounted.

FIG. 2 is a side view of the remote control light receiving unit.

FIG. 3 is a front view of the remote control light receiving unit.

FIG. 4 is a side view showing another example of the embodiment of the remote control light receiving unit of the present invention.

FIG. 5 is a side view showing still another example of the embodiment of the remote control light receiving unit of the present invention.

FIG. 6 is a schematic configuration diagram of a television on which a conventional remote control light receiving unit is mounted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Remote control light receiving unit 11 Light receiving main body part 11a Lead frame 11b Photodiode 11c Resin mold 11d Lens part 12 Shield case 13 Light guide part 13a Cover part 13b Lens cap part 13c Light guide main body part 20 TV 21 case 21a Front panel 21b Light receiving window 23 substrate

Claims (4)

[Claims] 1. A light receiving element mounted on a lead frame is molded by a resin mold part, and a light receiving main body part provided with a lens part projecting hemispherically on a resin mold part facing the light receiving element; It is integrally attached to the main body,
A cylindrical lens cap that covers the lens of the light-receiving main body, and a cylindrical light guide main body whose tip face abuts the light-receiving window to which signals from the remote control transmitter are irradiated, are made of translucent plastic. And a light guide unit formed concentrically and integrally with the light guide unit. 2. The remote controller according to claim 1, wherein the light receiving main body is covered by a shield case integrated with the light receiving main body, and a light guide is integrally attached to the shield case. Light receiving unit. 3. The remote control light receiving unit according to claim 1, wherein the light guide body of the light guide is hollow. 4. The remote control light receiving unit according to claim 1, wherein the resin mold portion and the light guide portion of the light receiving main body are integrally formed.