JPH07264509A - Luminance detecting device for television receiver or the like - Google Patents

Abstract

PURPOSE:To reduce the number of parts and assembling manhour and to prevent the generation of noise. CONSTITUTION:A decorative panel member 21 molded by a transparent or semi-transparent synthetic resin material and having a surface part 21B on which a part 21A other than a light receiving part 23 is treated by opaque processing is arranged on the front part of a luminance adjusting sensor 8. A light guide part 22 whose tip part 22A faces to the light receiving face 8A of the sensor 8 is integrally formed on the rear part of the member 21 which is in opposite to the light receiving part 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a television receiver,
The present invention relates to a brightness detection device in a television receiver or the like which is attached to an image monitor device or the like and automatically adjusts screen brightness or screen contrast by detecting ambient brightness.

[0002]

2. Description of the Related Art A television receiver is provided with a brightness detecting device for detecting the ambient brightness in order to obtain a natural and easy-to-see screen according to the ambient brightness.
This brightness detection device outputs a control output corresponding to the ambient brightness to an automatic brightness adjustment circuit or an automatic contrast adjustment circuit to control them and automatically adjust the brightness and contrast of the screen of the television receiver. Is configured.

The brightness detecting device is composed of a brightness adjusting sensor composed of an optical element such as a phototransistor or a photodiode, and the light receiving section of the brightness adjusting sensor is generally arranged on the front surface of the television receiver. . By the way, in television receivers, a design appearance is also an extremely important requirement, and recently, most television receivers are of a so-called remote control type, so that they are operated only in special cases. The various operation switches, operation knobs, and the like are covered with an openable / closable panel body that forms a part of the housing so as to maintain a functional appearance.

That is, as shown in FIG. 3, the television receiver 1 comprises a cathode ray tube 2 and a frame-shaped front panel member 3 which forms a part of a casing for enclosing the cathode ray tube 2, as shown in FIG. In recent years, the housing is based on monotone, especially black. As shown in FIG. 4, the front panel member 3 is provided with an operating portion 4 which is located in a lower portion of the cathode ray tube 2 and is formed as a lateral concave portion.
Is provided in the operation section 4, and various operation switch groups such as a power switch, a large number of channel switches, and a volume switch (not shown) are provided.

In the television receiver 1 which is generally constructed as a remote control type, the same color as the front panel member 3 is provided so as to cover the above-mentioned various operation switch groups which are hardly directly operated except in special cases. Therefore, the decorative panel member 5 that forms the same surface as the front panel member 3 in the assembled state is located in the front portion of the operation portion 4 and is assembled. The operation portion of the main power switch 6 is also provided so as to have the same color as the front panel member 3 and to be flush with the front panel member 3.

The brightness detecting device 7 includes a brightness adjusting sensor 8 including an optical element and a substrate 9 on which the brightness adjusting sensor 8 is mounted.
And a light guide member 11 to be described later that guides the external light to the brightness adjustment sensor 8 and is provided inside the operation portion 4 provided in the front panel member 3 forming a part of the housing. . By the way, as described above, the decorative panel member 5 that closes the operation portion 4 has its surface portion made of black or the like, which is the same color as the front panel member 3, and therefore the brightness is adjusted via the decorative panel member 5. A structure that allows external light to enter the sensor 8 is required.

Therefore, the conventional television receiver 1
In FIG. 4, as shown in FIG.
For example, the base 5A is formed of a transparent synthetic resin material such as acrylic resin, and the light-shielding surface portion 5B is formed by the two-color molding method using the same synthetic resin material as the front panel member 3 using the base 5A as a base. I am trying. Of course, the light-shielding surface portion 5B may be formed by screen-printing black or the like on the surface of the substrate 5A.

Decorative panel member 5 constructed as described above
A light receiving unit 10 is formed in the light receiving unit 10 corresponding to the brightness adjusting sensor 8 of the brightness detecting device 7. The light receiving unit 10 is configured by leaving a part of the base 5A as it is without forming the light shielding surface 5B applied to the surface of the decorative panel member 5. The light guide member 1 is located between the light receiving unit 10 and the brightness adjusting sensor 8 of the decorative panel member 5 configured as described above.
1 is provided.

The light guide member 11 is made of a transparent synthetic resin material having excellent light transmissivity, such as acrylic resin, and penetrates through a mounting hole 12 formed in the front panel member 3 constituting the operation portion 4. Thus, the front panel member 3 is supported. In the state where the light guide member 11 is supported by the front panel member 3, one end 11A of the light guide member 11 is the light receiving portion 1 described above.
0 extends in the vicinity of the back surface of 0 and the other end 11B extends in the vicinity of the light receiving surface 8A of the brightness adjustment sensor 8.

Therefore, the light from the room in which the television receiver 1 is installed is incident from the light receiving portion 10, transmitted through the light guide member 11 and projected onto the brightness adjusting sensor 8 via the light receiving surface 8A. . The brightness adjusting sensor 8 outputs a control output according to the room light to an automatic brightness adjusting circuit or an automatic contrast adjusting circuit to control them. As a result, the television receiver 1 automatically adjusts the brightness and contrast of the cathode ray tube according to the brightness of the room in which it is installed.

[0011]

The light guide member 11 for guiding the external light to the brightness adjusting sensor 8 described above is an extremely small component, and moreover, the mounting hole 12 provided in the front panel member 3.
Since it is a troublesome work of assembling so that it penetrates through, there is a problem that the workability in the assembly process of the television receiver 1 is significantly impaired. Further, there is a problem that the light guide member 11 may vibrate in resonance with a sound emitted from a speaker, for example, and the vibrating sound becomes noise and causes a product defect. Furthermore, since the brightness and contrast of the screen of the cathode ray tube 2 are accurately adjusted according to the ambient brightness,
The light guide member 11 must be accurately positioned so as to correspond to the light receiving unit 10 and the light receiving surface 8A of the brightness adjustment sensor 8.

Therefore, the present invention has been proposed for the purpose of providing a luminance detecting device in a television receiver or the like which streamlines the assembling process and prevents the generation of noise.

[0013]

A brightness detecting device for a television receiver or the like according to the present invention, which achieves this object, is formed of a transparent or semitransparent synthetic resin material and has at least a light receiving portion on its surface. A decorative panel member that forms a casing whose remaining portion is subjected to an opaque layer treatment, and a brightness adjustment that detects the ambient brightness disposed inside the main body of the device that is closed by the decorative panel member And a sensor. Further, the decorative panel member is integrally formed with a light guide portion whose front end is opposed to the light receiving surface of the brightness adjusting sensor on a back surface portion corresponding to the light receiving portion. The decorative panel member opens and closes an operation unit in which various operation switch groups are arranged.

[0014]

According to the brightness detecting device in the television receiver or the like according to the present invention constructed as described above, the light guide part for guiding the light from the outside to the brightness adjusting sensor is integrally formed on the back surface of the decorative panel member. When the decorative panel member is formed, the light-receiving panel can be assembled only by a step of assembling so as to close the operation part in which various operation switch groups provided on the front panel member, which constitutes the casing for enclosing the cathode ray tube, are closed. Optical communication is achieved between the unit and the brightness adjustment sensor of the brightness detection device. Therefore, it is possible to reduce the number of parts of the television receiver or the number of troublesome assembling steps.

The decorative panel member is attached to the front panel member with sufficient mechanical strength. Therefore, unlike the conventional television receiver, the problem that the light guide member vibrates to generate noise does not occur.

[0016]

EXAMPLES Specific examples of the present invention will be described in detail below. The luminance detection device 20 of the embodiment is provided in the above-mentioned television receiver 1 and outputs the control output to the automatic luminance adjustment circuit or the automatic contrast adjustment circuit in order to make the CRT 2 a natural and easy-to-see screen according to the ambient brightness. Then, these are controlled to automatically adjust the brightness and contrast of the screen of the television receiver. The basic configuration of the television receiver 1 and the brightness detection device 20 is as follows.
This is the same as the above-described conventional apparatus, and the same members or corresponding members will be denoted by the same reference numerals and detailed description thereof will be omitted.

The brightness detecting device 20 of this embodiment is also integrated with the brightness adjusting sensor 8 including an optical element such as a phototransistor or a photodiode, the substrate 9 on which the brightness adjusting sensor 8 is mounted, and the decorative panel member 21 as described later. The light guide portion 22 is formed. Then, the brightness detecting device 20 is an operation portion formed as a lateral recessed portion located below the cathode ray tube 2 of the frame-shaped front panel member 3 that constitutes a part of the housing that covers the cathode ray tube 2. 4, the brightness adjustment sensor 8 as described later.
Is arranged with its light receiving surface 8A facing the front side of the television receiver 1.

A decorative panel member 21 is attached to the front portion of the operation section 4 in which various operation switch groups such as a power switch (not shown) or a large number of channel switches and volume switches are arranged. As shown in FIG. 1, this decorative panel member 21 is configured as a horizontally long plate-like member formed in a substantially arcuate cross section corresponding to the shape of the front panel member 3 forming a part of the housing, and is assembled. And the same surface as the front panel member 3 in the closed state

As will be described later, the decorative panel member 21 has a surface portion of which the color tone is the same as that of the front panel member 3, for example, black, and corresponds to various operation switch groups arranged in the operation portion 4. Guide letters, such as "SE
"TUP", "VOL", "CHAN" or "POWER"
Characters such as “R” are screen-printed in white or the like, and a light receiving unit 23 and a power-on display unit 24 corresponding to the brightness detection device 20 are provided. As described above, the decorative panel member 21 is black so that the entire surface thereof is subjected to the light-shielding treatment.
3 and the power-on display unit 24 are configured as a translucent unit.

The decorative panel member 21 is made of a transparent or colored translucent synthetic resin material having excellent light transmittance, for example, a transparent or colored acrylic resin, on the substantially plate-shaped portion having an arc-shaped cross section and on the back surface of the plate-shaped portion. A base 21A composed of a plurality of mounting portions (not shown) formed integrally with each other is formed, and a light-shielding surface portion 21B is formed on the base 21A by a two-color molding method using the same synthetic resin material as that of the front panel member 3. Is configured.

Since the front panel member 3 is formed by using, for example, a black engineering plastic excellent in mechanical properties or insulating properties, the resin material of the surface portion 21B of the decorative panel member 21 is also the engineering plastic of the same color. Is used. When the two-color molding of the surface portion 21B is performed on the base portion 21A, the resin corresponding to the light receiving portion 23 and the power-on display portion 24 is not filled with the resin forming the surface portion 21B. Therefore, the light receiving unit 23 and the power-on display unit 24 are
It is left as a transparent or colored translucent part which is the ground of A,
It is configured as a transparent portion.

In the method of forming the front surface portion 21B by the two-color molding method with respect to the base portion 21A, the television receiver 1 does not make the decorative panel member 21 and the front panel member 3 feel uncomfortable. It is extremely effective in maintaining the appearance of. In addition to the two-color molding method, for example, the light receiving portion 23 and the power-on display portion 24 are provided on the surface of the base 5A.
Needless to say, the light-shielding layer may be formed by screen-printing black or the like.

Decorative panel member 2 constructed as described above
1 has the same basic structure as that of the above-described conventional decorative panel member 5, but is characterized in that the light guide portion 22 is integrally formed on the back surface to project. That is, the light guide portion 22 is integrally formed on the rear surface of the decorative panel member 21 corresponding to the light receiving portion 23 as a rod-shaped member having a plurality of axial reinforcing ribs formed on the outer peripheral surface thereof.
The free end portion 22A of the light guide portion 22 penetrates the guide hole 25 formed in the front panel member 3 forming the operation portion 4 in a state where the decorative panel member 21 is assembled to the front panel member 3. To do.

The guide hole 25 is formed in the front panel member 3 so that the axis of the guide hole 25 coincides with that of the brightness adjusting sensor 8 of the brightness detecting device 20, and the free end of the light guide portion 22 penetrating the guide hole 25. The portion 22A extends so as to face the light receiving surface 8A of the brightness adjustment sensor 8.

Therefore, the light in the room where the television receiver 1 is installed is incident from the light receiving portion 23 formed on the decorative panel member 21 and transmitted through the light guide portion 22, and the free end portion 22A to the light receiving surface 8A. It is projected onto the brightness adjustment sensor 8 via. The brightness adjusting sensor 8 outputs a control output according to the room light to an automatic brightness adjusting circuit or an automatic contrast adjusting circuit to control them. As a result, the television receiver 1 automatically adjusts the brightness and contrast of the cathode ray tube according to the brightness of the room in which it is installed.

The decorative panel member 21 described above includes
Although not shown, a rod-shaped light guide unit is also integrally formed on the back surface corresponding to the power-on display unit 24. This light guide is
The free end extends close to the light emitting surface of the LED that lights up when the main power switch 6 of the television receiver 1 is closed. Therefore, since the light of the LED is exposed to the outside from the power-on display unit 24 via the light guide unit,
The lighting state of this LED is efficiently displayed.

The above embodiment is based on the television receiver 1
Although the brightness adjusting device 20 attached to the above has been described, it goes without saying that the brightness adjusting device 20 is also applied to a so-called image monitor device having no speaker or the like. Further, the front-side housing that covers the cathode ray tube is configured by the front panel member 3 and the decorative panel member 21 that opens and closes the operation section 4 in which the operation switch group is arranged. The decorative panel member 21 is provided with the light guide section 22. Although integrally formed, when the brightness adjusting device 20 is arranged at a place other than the operation part 4, the light guide part 22 corresponds to the position where the brightness adjusting device 20 is arranged, for example, a front panel member. Three
Needless to say, it is integrally formed on the back surface of the.

[0028]

As described above in detail, according to the brightness detecting device in the television receiver or the like according to the present invention, the light guide portion integrally formed on the back surface of the decorative panel member is the decorative panel. By combining the member with another panel member that forms the housing, the light receiving unit that receives external light and the brightness adjustment sensor are accurately positioned to be interposed. Therefore, it is possible to reduce the number of parts or the number of troublesome assembling steps of the light guide member, and external light is efficiently received by the brightness adjustment sensor, and the brightness and contrast of the screen are accurately adjusted according to the ambient brightness. . In addition, since the decorative panel member is attached to another panel member with sufficient mechanical strength, there is a problem that the light guide member vibrates and noise is generated like a conventional television receiver. It does not occur.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part of a television receiver in which a luminance detecting device according to the present invention is adopted.

FIG. 2 is a main part front view showing a decorative panel member that opens and closes an operation section in which various operation switch groups of the television receiver are arranged.

FIG. 3 is a front view of a television receiver including a brightness detection device.

FIG. 4 is a longitudinal sectional view of an essential part for explaining a conventional brightness detecting device provided in the television receiver.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Television receiver 2 CRT 3 Front panel member 4 Operation part 8 Brightness adjusting sensor 9 Substrate 20 Brightness adjusting device 21 Decorative panel member 22 Light guiding part 23 Light receiving part

Claims (2)

[Claims] 1. A decorative panel member, which is made of a transparent or semitransparent synthetic resin material and constitutes a casing in which at least a light receiving portion is left on a surface portion and an opaque layer treatment is applied to the other portion, The decorative panel member includes a brightness adjustment sensor that detects the brightness of the surroundings disposed inside the main body of the device that is closed by the decorative panel member. A brightness detecting device in a television receiver or the like, characterized in that a light guide section facing the light receiving surface of the brightness adjusting sensor is integrally formed in a protruding manner. 2. A television receiver characterized in that the decorative panel member is a panel member for opening and closing an operation section provided with a power switch or a group of various operation switches such as a plurality of channel switches and a volume switch. Luminance detection device in etc.