JP2002185023A - Receiver structure for remote control - Google Patents

Abstract

(57) [Problem] To provide a light receiving unit structure capable of improving the light collecting property without protruding the front surface of a light guide and improving the reliability of remote controller operation. SOLUTION: A light guide 2 for receiving a light emission signal such as infrared light from a remote controller is arranged facing a surface of a device, and receives a light emission signal on the back of the light guide 2 and sends a signal to a control unit of the device. It is a light receiving unit structure for remote control including a light receiving element 4 that outputs light, and the front surface of the light guide 2 is a Fresnel lens 2b that does not protrude forward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light receiving portion structure provided with a light receiving element for receiving an optical signal from an optical remote controller using, for example, infrared rays.

[0002]

2. Description of the Related Art A remote controller for operating a device such as a television emits, for example, infrared rays from a light emitting element provided in a light emitting unit, and inputs a light emitting signal to a light receiving element provided in the device. On the device side, the light emission signal received by the light receiving element is input to the control unit of the device, and the on / off of the switch, the sound volume and the channel are changed according to the operation by the remote controller.

[0005] In order to perform an operation by emitting light on the remote controller side and receiving light on the device side, for example, in the case of a television, a light transmitting window is provided on the front side of the television body 51 as shown in FIG. The light receiving element 5 is provided at a position where light from the light transmitting window 52 can be received.
3 is incorporated. The light receiving element 53 is, for example, a photo IC for remote control. In order to eliminate the influence of noise due to electromagnetic waves from a CRT or the like built in the television main body 51, the light receiving element 53 is covered with a shield cover 53a except for the front light receiving surface,
By grounding the cover 53a to the ground, noise due to electromagnetic waves is absorbed.

[0004] In such a structure in which light is transmitted from the light transmitting window 52, if the light receiving element 53 is as close to the light transmitting window 52 as possible, the light from the remote controller can be reliably received by the light receiving element 53. Operations are also performed reliably. However, as the number of functions of the television increases, the number of devices incorporated in the television body 51 increases, and it is necessary to provide a layout that does not interfere with each device. In particular, since the CRT is located on the front side of the television main body 51 so as to occupy almost the entire area, the light receiving element 53 cannot often be installed immediately behind the light transmission window 52. If the light receiving element 53 moves away from the light transmitting window 52 in this manner, it is not possible to sufficiently receive light emission from the remote controller. Operation failure such as being left.

Therefore, if the light guide 54 is arranged between the light transmission window 52 and the front of the light receiving element 53, light from the remote controller can be efficiently incident on the light receiving element 53. The light guide 54 is made of, for example, a transparent acrylic resin, and is often formed in a column shape in terms of workability. When the light guide 54 is provided, the light receiving element 53 is provided.
Can not be arranged close to the back surface of the light transmission window 52, the light from the remote controller can be sufficiently incident on the light receiving element 53.

[0006]

However, light from the remote controller is transmitted through the light guide 54 to the light receiving element 5.
3, the light quantity is likely to be attenuated while passing through the light guide 54 or the directivity of the introduced light is likely to be reduced, resulting in a short receiving distance. In order to solve such a problem, the light collecting property of the light guide 54 may be increased. For example, a hemispherical lens 54a is provided on the light receiving surface of the light guide 54 as shown in FIG. That is effective. That is, since the light from the remote controller can be effectively condensed by the hemispherical lens 54a and introduced into the light receiving element 53, the attenuation of the light amount and the deterioration of the directivity of light are prevented.

However, when the lens 54a is provided,
As shown in the figure, it protrudes greatly from the front surface of the television main body 51. For this reason, in addition to affecting the appearance of the television main body 51, a fingertip or the like is easily hooked on the lens 54a, and the lens 54a may be damaged.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a light receiving unit structure capable of improving the light collecting property without protruding the front surface of the light guide and improving the reliability of the operation of the remote controller.

[0009]

According to the present invention, a light guide for receiving a light emission signal such as infrared light from a remote controller is arranged facing a surface of a device, and the light emission signal is provided on the back of the light guide. A remote control light receiving unit structure including a light receiving element for receiving and outputting a signal to a control unit of the device, wherein a front surface of the light guide is a Fresnel lens that does not protrude forward.

According to the present invention, there is provided a light receiving portion structure capable of improving the light collecting property without protruding the front surface of the light guide and improving the reliability of the operation of the remote controller.

[0011]

According to the first aspect of the present invention, a light guide for receiving a light emission signal such as an infrared ray from a remote controller is arranged facing a surface of a device, and the light emission is provided on a back of the light guide. A remote control light receiving structure including a light receiving element for receiving a signal and outputting a signal to a control unit of the device, wherein the front surface of the light guide is a Fresnel lens that does not protrude forward. A light-receiving part for control, equipped with a Fresnel lens on the front of the light guide to improve the light-gathering properties of light from the remote controller, and since the light guide does not protrude forward, the appearance of the device Has the effect of not impairing.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic view of a television having a light receiving portion structure for remote control according to the present invention.
(A) is a front view, (b) is a side view which shows an internal structure.

In FIG. 1, a CRT 1a is incorporated in a main body 1 of a television, and a light receiving section A for remote control is incorporated in a space at a lower right portion thereof. The light receiving section A is composed of a light guide 2 disposed outside the surface of the main body 1, a light receiving element 4 mounted on a substrate 3, and a cover 5 for electromagnetic shielding. It is.

FIG. 2 is an exploded perspective view of the light receiving element 4 and the cover 5.

The light receiving element 4 utilizes a photo IC. As shown in FIG. 2, the light receiving element 4 forms a spherical light receiving surface 4a and projects three leads 4b downward. It is mounted on the substrate 3 in a conductive manner. The cover 5 is formed by bending a metal plate.
An opening 5a is formed on the front side, and only the light receiving surface 4a and the back and bottom sides are opened to cover the surface of the light receiving element 4 corresponding to the traveling direction of the electromagnetic wave from the high voltage portion of the CRT 1a. The cover 5 is connected to the ground by the lead 4b, and functions as an electromagnetic shield for the light receiving element 4 by releasing the electromagnetic wave to the ground.

FIG. 3 is a longitudinal sectional view of a main part showing a light receiving portion A in the main body 1, and FIG. 4 is a front view of the light guide 2.

The light receiving element 4 is arranged at a position distant from the front wall 1b of the main body 1, is electrically connected to the substrate 3, and has a light receiving surface 4b.
The light guide 2 is arranged substantially coaxially with a. The light guide 2 has a substantially cylindrical shape formed of a transparent acrylic resin, and is provided with a flange portion 2a on the outer peripheral surface on the front end side for fitting into a transmission window 1c opened in the front wall 1b. A Fresnel lens 2b is provided on the front surface of the flange 2a.
Are formed coaxially. As is conventionally known, the Fresnel lens 2b is a thin lens formed in a step shape so as to have the optical property of a thick lens, and has a spiral groove when viewed from the front as shown in FIG. .

In the above configuration, when infrared light from a remote controller (not shown) enters the light guide 2,
The infrared light is introduced from the light guide 2 to the light receiving surface 4a and is
Is output to a control unit (not shown) built in the main body 1. By the output of this signal, the audio volume is adjusted and the channel is changed in accordance with a command from the remote controller.

The light guide 2 has a flange portion 2a formed by a transmission window 1
c and the front side is formed with a Fresnel lens 2b, so that infrared light from the remote controller can be easily collected. That is, since the Fresnel lens 2b is formed to have the optical properties of a thick lens,
As in the case of the conventional hemispherical lens shown in FIG. 5B, the light collection rate can be increased. Therefore, the infrared light from the remote controller can reliably reach the light receiving surface 4a of the light receiving element 4, and various operations can be executed without malfunction.

Further, the Fresnel lens 2b is
a, the flange portion 2a
Has a shape that does not protrude forward. For this reason, the front end of the light guide 2 does not protrude greatly from the front wall 1b of the main body 1 and does not affect the appearance of the main body 1 and does not catch a fingertip or a tool. Avoid own damage.

[0022]

According to the present invention, since the Fresnel lens is formed on the front surface of the light guide, it is possible to effectively collect infrared light and the like from the remote controller. Light can be introduced without a decrease in directional characteristics, and the operability of the device by the remote controller can be improved. Further, since the light guide does not protrude forward from the front wall of the device, it does not affect the appearance of the device and does not catch a fingertip, so that damage to the light guide can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic view of a television having a light receiving portion structure of the present invention, wherein (a) is a front view and (b) is a side view showing an internal structure.

FIG. 2 is an exploded perspective view of a light receiving element and a cover for shielding the light receiving element.

FIG. 3 is a longitudinal sectional view showing a main part of a light receiving unit.

FIG. 4 is a front view of a light guide.

FIG. 5 is a conventional example, in which (a) is a longitudinal sectional view showing a main part of a light receiving section provided with a conventional light guide, and (b) is a hemispherical lens formed on the front surface of the light guide. Longitudinal sectional view of the main part showing an example

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 1a CRT 1b Front wall 1c Transmission window 2 Light guide 2a Flange part 2b Fresnel lens 3 Substrate 4 Light receiving element 4a Light receiving surface 4b Lead 5 Cover 5a Opening A Light receiving part

Claims (1)

[Claims] 1. A light guide for receiving a light emission signal such as infrared light from a remote controller is arranged facing a surface of a device, and the light emission signal is received on a back portion of the light guide, and a control unit of the device receives the light emission signal. A light receiving unit structure for remote control including a light receiving element for outputting a signal, wherein a front surface of the light guide is a Fresnel lens that does not protrude forward.