JPH09237991A - Receiver equipment and its shield case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve light receiving characteristics, by constituting an aperture having a thin wire shield member formed in a concentric circle, in the front, concerning a center on a line stretching a shield case from the center of a receiving part toward the front. SOLUTION: A circular aperture 11 is formed in the front face 10f of a shield case 10. A light receiving center C is the center of light receiving function of a light receiving element 20 in the shield case 10. An axis A which passes the center C and stretches to the front on the light receiving function of the light receiving element 20 is made constitution passing the circle center of the aperture 11 of the shield case 10. In the circular aperture 11, a thin wire shield member on a ring is formed in a unified body with a shield case 10 on a concentric circle concerning the circle center of the aperture 11. The distance from the light receiving center C to the circular outer edge of the circular aperture 11 is constant at all angles setting the axis A as a center. The distance as far as the thin wire shield member is also constant at all angles setting the axis A as a center. Therefore, the receiving state is constant for movement in all directions, and receiving characteristics can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver and its shield case, and more particularly to a receiver having a metal shield case for preventing reception of external noise and its shield case.

For example, in a video game machine, what is called a control pad is used as a device for a game player to input an operation signal. This control pad is provided with various operation switches and keys, the player operates these switches and keys with fingers, and the operation signal corresponding to the operation is transmitted from the control pad to the game machine body. In response to this, for example, a character such as a person who appears on the screen of the game machine acts and operates.

This type of control pad has conventionally been connected to the game console main body by a cable, but recently, an operation signal is transmitted from the control pad to the game console main body by wireless transmission of light, radio waves or the like. It is desired to provide a system that can omit the cable connecting the game console and the game console body.

[0004]

2. Description of the Related Art In such a wireless transmission system, a receiving device that receives light or radio waves may receive external noise other than the operation signal that should be originally received. It is effective to provide a metal shield case to prevent reception of external noise.

As a conventional metal shield case of this type, Japanese Utility Model Publication No. 51-45495 and Japanese Utility Model Publication No. 62-23.
No. 182 and Japanese Utility Model Publication No. 6-28873. FIG. 11 shows a schematic shape of a typical shape of these conventional shield cases.

In the structure shown in FIG. 11A, a plurality of slit-shaped openings extending in the vertical direction are provided on the front surface of a substantially cubic shield case. In the structure shown in FIG. 11B, a plurality of slit-shaped openings extending in the lateral direction are provided on the front surface of a substantially cubic shield case. In the structure shown in FIG. 11C, a plurality of square-shaped openings aligned vertically and horizontally are provided on the front surface of a substantially cubic shield case.

A light receiving element for receiving a transmission signal is housed in these shield cases. The signal transmitted from the transmitter enters the inside of the shield case through these openings provided on the front surface of the shield case, and is received by the light receiving element inside the receiver.

[0008]

For example, when the wireless transmission system is applied to signal transmission between the game machine main body of the video game and the control pad as described above,
The player operates the control pad with his or her hand. In this case, the player may be located at various positions with respect to the main body of the game machine. That is, the transmitter provided on the control pad may be located at various positions with respect to the receiving device provided on the game machine body.

However, in the above-mentioned conventional shield case, the shape of the opening provided on the front surface thereof has a two-dimensional directional property. As a result, in the configuration of FIG. 11A, for example, even if the transmitter moves in the vertical direction with respect to the receiving device, its receiving characteristic becomes substantially constant within a certain range, but the transmitter does not receive the receiving device. When moving in the lateral direction, it is conceivable that the received signal is blocked by the slit-shaped opening of the shield case.

Further, in the configuration of FIG. 11 (c), when the transmitter moves only in the vertical or horizontal direction, the reception state thereof is substantially constant, but the transmitter is oblique to the receiving device, for example, in the oblique direction. Considering the case of moving from the upper right to the lower left, in such a case, the signal reception state is different from that in the case of moving vertically or horizontally.

That is, in the shape of the opening of the conventional shield case as shown in FIGS. 11 (a) and 11 (b), the reception state of the received signal differs depending on the moving direction of the transmitter. As a result, when the transmitter moves in one direction, the signal reception is good, but when the transmitter moves in another direction, the reception condition may become relatively poor. Can be considered.

An object of the present invention is to provide a receiving apparatus which improves the light receiving characteristic and can favorably receive transmission signals emitted from various directions.

[0013]

In order to achieve the above object, in a receiver according to the present invention, a shield case has a center on a line extending from the center of the light receiving function of the light receiving element to the front thereof. With respect to the above, the front surface has an opening having a thin wire shield member provided concentrically.
Further, in order to support the thin wire shield member, a support member is provided so as to extend radially with respect to the center of the opening.
At that time, a circular opening is provided at the center of the opening so that the tip of the light receiving portion of the light receiving element is exposed. Also,
The opening is configured to have an outer diameter that allows the light receiving range of the light receiving element to pass through.

[0014]

1 is a schematic perspective view of a receiver 1 according to an embodiment of the present invention, and FIG. 2 (a), (b), (c)
2 shows a front view, an internal plan view, and an internal side view of the receiving device 1, respectively. The receiving device 1 is a metal (tinplate (SPT
E)) A shield case 10 and a light receiving element 20 housed inside the shield case 10.

As shown in the figure, a circular opening 11 is provided on the front surface 10f of the shield case 10. In addition, an axis A extending through the light receiving center C which is the light receiving function center of the light receiving element 20 inside the shield case 10 and extending in front of the light receiving function of the light receiving element 20 passes through the circular center of the opening 11 of the shield case 10. is there.

In the circular opening 11, ring-shaped thin wire shield members R1 and R2 are formed integrally with the shield case 10 in concentric circles with respect to the circular center of the opening 11. The thin wire shield members R1 and R2 have a function of preventing external noise from entering the shield case 10. Further, the support member H is formed integrally with the shield case 10 so as to extend radially in four oblique directions with respect to the center of the opening 11 to the periphery thereof. The four support members H support the two thin wire shield members R1 and R2 at predetermined positions shown in the figure. These thin wire shield members R1 and R
2 and the opening 11 including the support member H are shield cases 10
It is integrally molded at the time of molding. The opening 11 is formed by the thin wire shield members R1 and R2 and the four support members H, as shown in the drawing, a circular region F in the center and four arc regions G1 outside thereof.
And is further divided into four outer circular arc regions G2.

The light receiving range S of the light receiving element 20 is shown in FIG.
As shown in (b) and (c), the light-receiving center C extends in a conical shape, and the outer peripheral surface P of the light-receivable range S has an opening 1 with a circular outer diameter crossing the front surface 10f of the shield case 10.
1 has a large outer diameter. Therefore, the receivable range S is configured so that the entire range passes through the opening 11 except for the part shielded by the thin wire shield members R1 and R2 and the four support members H.

As described above, in the illustrated embodiment, the shape of the opening 11 provided on the front surface of the shield case 10 is a circle centered on the point through which the axis A extending in front of the light receiving center C of the light receiving element 20 passes. A thin wire shield member R formed in the opening 11 concentrically with respect to the center of the circle.
1 and R2 are provided. As a result, the distance from the light receiving center C to the circular outer edge of the circular opening becomes constant at all angles about the axis A, and similarly, the thin wire shield member R from the light receiving center C.
The distances to 1 and R2 are also constant at all angles about the axis A. Further, in the center of the opening 11, there is provided a circular area F inside the thin wire shield member R1 which is not blocked at all, and thereby the tip of the light receiving portion 20a of the light receiving element is exposed.

Therefore, even if a transmitter that oscillates a light or radio wave signal toward the receiving device 1 moves in any of vertical, horizontal, diagonal, or any direction with respect to the receiving device 1, the reception state becomes constant and reception (light reception) is performed. The characteristics are improved. Although not shown, when the receiver 1 is actually used, the receiver 1 is covered with a plastic shield cover. This plastic shield cover has a function of preventing reception of external noise, and its material is selected according to the wavelengths of light and radio signals. That is, the material of the shield cover is selected to be a material that allows transmission of light that should be originally received and signals of wavelengths of radio waves, but does not transmit signals of other wavelengths.

3, 4, 5 and 6 show the detailed structure of the metallic shield case 10. Shield case 10
Is the upper case 10A made of tin (SPTE)
And the lower part 10B of the case. 3 (a), (b),
(C), (d), (e) is a front view, a plan view, a left side view, a right side view and a rear view of the case upper portion 10A, respectively. FIG. 4 is an enlarged view of the opening 11 provided on the front surface 10f of the case upper portion 10A. 5 (a), (b),
(C), (d), (e) is a front view, a plan view, a left side view, a right side view and a rear view of the case lower portion 10B, respectively. 6 (a) and 6 (b) respectively show the case upper part 10A.
It is a front view and a right side view of the shield case 10 in which the case lower part 10B is combined.

As shown in FIG. 6, the shield case 10 is
The printed circuit board 30 on which the light receiving element 20 is mounted is attached to the case upper part 10 together with the light receiving element mounting portion of the printed circuit board
It is formed by being sandwiched between A and the case lower portion 10B so as to be covered from above and below. Top 10 of these cases
The A and lower portions 10B are grounded by connecting to the ground busbars of the circuit of the printed circuit board 30, respectively, and the shield effect is secured, so that external noise is surely prevented from entering the shield case 10.

In this embodiment, the width W of the shield case 10 is about 24 mm and the height H is about 18 m in FIG.
m, depth D is about 17 mm. In addition, in FIG. 4, the outer diameter of the circular opening 11, that is, the outer diameter d3 of the outer circular arc region G2.
Is 13 mm, and the diameter d1 of the central circular area F is 3.6 m.
m, the outer diameter d2 of the inner arc region G1 is 8, 2 mm, the width w1 of each of the thin wire shield members R1, R2 and the width w2 of each of the four support members H is 0.5 mm.
It is. The plate thickness of each material of the case upper part 10A and the case lower part 10B is about 0.3 mm.

FIGS. 7, 8, 9 and 10 are for explaining an example in which the receiving apparatus 1 of the embodiment of the present invention is applied to a video game machine. The receiving device 1 is mounted in the receiving section 51 of the receiver 50 shown in FIG. This receiver 50 is connected to the game machine main body 100 with a connector 5
2 are connected. The internal functional block configuration of the receiver 50 is shown in FIG. The operation signal received by the photodiode 20 as the light receiving element 20 of the receiving unit 51 is amplified by the amplifier 30, and the gate array 40 is further amplified.
The received light signal is digitized by. The digital signal thus obtained is transferred to the game machine main body 100 via the connector 52. This signal is subjected to predetermined signal processing by the internal signal processing circuit of the game machine body,
As a result, for example, a character such as a person who appears on the screen of the game machine acts and operates according to the corresponding operation signal.

FIG. 8 is a conceptual outline view of the control pad 60 as described above, which functions as a transmitter 60 for transmitting a light and radio wave signal containing the operation signal to the receiver 50, and FIG. It is the internal functional block diagram.
As shown in the figure, the control pad 60 is provided with various push button switches X, Y, Z, A, B, C, L, R, direction keys, start keys, function keys, and select switches. The operation given by is input to the one-chip microcomputer 73 as an operation signal via the key matrix 71 and the select switch 72. The microcomputer 73 receives the oscillation signal from the oscillator 75, performs a predetermined process together with the operation signal, and generates a drive signal. This drive signal drives the IR (infrared) diode 74 provided in the transmitter 61 to emit infrared rays. The infrared rays function as light including the operation signal and a radio wave signal, and are received by the receiving device 1 and processed by the receiver 50 and the game machine main body 100 as described above.

In the case of this embodiment, the transmittable range of the transmitter (control pad) 60 is ± 40 in the horizontal direction.
And ± 40 ° in the vertical direction, and the transmission signal arrival distance is 5 m or more on the optical axis. Further, the receivable range S of the receiving device 1 is ± 60 ° in the horizontal direction and ± 60 ° in the vertical direction.

Further, the receiver 50 has a built-in load capacitance type, an oscillation frequency of 4.00 MHz, a frequency deviation of ± 0.5% (normal temperature) and a temperature characteristic of ± 0.3% (-20 to 80 ° C). (Not shown) is used, one BPV 22F is used as the photodiode 20, and the receiving range is ± 60 °, with an IR filter, λp = 95.
The sensitivity is 0 nm and the sensitivity is 0.6 A / W (λ = 950 nm).
As the amplifier 30, one U2506B-FP is used, and the SOP is 16P and the carrier frequency is 400 kHz.

As the oscillator 75 of the transmitter 60, a load capacitance built-in type, oscillation frequency 4.00 MHz, frequency deviation ± 0.5% (normal temperature), temperature characteristic ± 0.3% (−20)
˜80 ° C.) ceramic oscillating element is used. As the IR diode 74, three GaAs infrared type ones are used.
mW.

Next, an experimental example in which the receiving functions of the receiver 50 including the receiving device 1 using the shield case 10 having the above structure and the receiver using the shield case of the prior art are compared will be shown. As an experimental condition, first, a receiver was installed in front of the transmitter, and the reachable distance of the infrared signal emitted from the transmitter to the receiver was measured. As a result, the reachable distance of the receiver using the vertical slit type shield case as shown in FIG. 11A is 590 cm.
The reachable distance is 600 cm in the case of the receiver using the lateral slit type shield case as shown in (b), and the reachable distance is 650 cm in the case of using the shield case 10 of the above-described embodiment of the present invention. It was

Further, the distance between the transmitter and the receiver was kept at 50 cm, and the maximum moving distance at which the infrared signal can reach the receiver when the transmitter was moved in the left-right direction was examined.
The maximum movable distance is 75 cm for a receiver that uses a horizontal slit type shield case as shown in (b).
The maximum movable distance when the shield case 10 of the example of the present invention was used was 91 cm.

Further, the distance between the transmitter and the receiver was kept at 50 cm, and the maximum moving distance at which the infrared signal can reach the receiver when the transmitter was moved upward was examined.
The maximum movable distance is 60 cm for a receiver that uses a horizontal slit type shield case as shown in (b).
The maximum movable distance when the shield case 10 of the example of the present invention was used was 58 cm.

Further, the distance between the transmitter and the receiver was kept at 50 cm, and the maximum moving distance at which the infrared signal can reach the receiver when the transmitter was moved downward was examined.
The maximum movable distance is 34 cm for a receiver that uses a horizontal slit type shield case as shown in (b).
The maximum movable distance when the shield case 10 of the embodiment of the present invention was used was also 34 cm.

In the case of a receiver using a vertical slit type shield case as shown in FIG. 11 (a), the first measured reach distance is a receiver using two other types of shield cases. Since it was 590 cm shorter than the above, that is, the function was inferior, the experiment to move the transmitter up, down, left and right was not performed.

As a result of this experiment, when the receiver according to the embodiment of the present invention is used, the function is slightly inferior when the transmitter is moved upward as compared with the case where the conventional shield case is used. By itself, the results of other experiments were found to be the same or better. In particular, it was found that the results of the first reachable distance measurement experiment were clearly superior to the conventional products.

[0034]

According to the present invention, the shield case has, on the front surface, an opening having a thin wire shield member having a center on a line extending from the center of the light receiving function of the light receiving element to a front face and concentrically provided with respect to the center. It is configured to have. As a result, the distance from the light receiving center of the light receiving element to the circular outer edge of the aperture is constant at all angles, and similarly, the distance from the light receiving center to the thin wire shield member is also constant at all angles. Therefore, even if the transmission source moves in any direction with respect to the receiving device in the vertical, horizontal, or diagonal directions, the receiving state becomes constant, and the receiving (light receiving) characteristics are improved.

In order to support the thin wire shield member, a support member is provided so as to extend radially with respect to the center of the opening. Since the thin wire shield member is supported in the opening with such a configuration, it is possible to form a structure that effectively supports the thin wire shield member.

Further, since the circular opening area is provided in the center of the opening so that the tip of the light receiving portion of the light receiving element is exposed, it is possible to extend the reach distance from the front transmission source to the light receiving element. . Further, since the opening has the outer diameter that allows the light receiving area of the light receiving element to pass therethrough, it is possible to maximize the light receiving area of the light receiving element.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a receiving device according to an embodiment of the present invention.

2 is a schematic front view, a schematic internal plan view, and a schematic internal side view of the receiving device in FIG. 1. FIG.

FIG. 3 is a diagram showing a structure of an upper part of a case of the receiving device of FIG.

4 is a diagram showing the shape of an opening provided in the upper part of the case of FIG.

5 is a diagram showing a structure of a lower part of a case of the receiving device of FIG.

FIG. 6 is a view in which a shield case is configured by combining the case upper part of FIG. 3 and the case lower part of FIG.

7 is a conceptual outline view of a receiver to which the receiving device of FIG. 1 is applied.

8 is a conceptual outline view of a transmitter that emits a signal to the receiver of FIG.

9 is a functional block diagram of the receiver of FIG. 7. FIG.

FIG. 10 is a functional block diagram of the transmitter of FIG.

FIG. 11 is a diagram showing a structural example of a conventional shield case.

[Explanation of symbols]

 1 receiver 10 shield case 10A, 10B case upper part, case lower part 11 opening 20 light receiving element 20a light receiving part R1, R2 thin wire shield member H support member F circular area G1, G2 arc area C light receiving center S light receiving range

Claims (10)

[Claims] 1. A thin wire comprising a receiving part and a shield case covering the receiving part, the shield case having a center on a line extending directly in front of the receiving function center of the receiving part and concentrically provided with respect to the center. A receiving device having a front opening having a shield member. 2. The receiving part is composed of a light receiving element, and the shield case has an opening having a thin line shield member having a center on a line extending directly in front of the light receiving function center of the light receiving element and concentrically provided with respect to the center. The receiving device according to claim 1, which has a front surface. 3. The receiving device according to claim 1, wherein the opening is provided so as to extend radially with respect to a center thereof, and has a support member that supports the thin wire shield member. 4. The opening has a circular opening in the center thereof,
The receiving device according to claim 3, wherein the tip of the receiving unit is exposed. 5. The receiving device according to claim 1, wherein the opening has an outer diameter that allows a receivable range of the receiving unit to pass therethrough. 6. An opening for accommodating a receiving portion, the opening having a thin wire shield member having a center on a line extending from the center of the receiving function of the receiving portion directly to the front and concentrically provided with respect to the center is provided on the front surface. Shielded case. 7. The receiving section is composed of a light receiving element, and an opening having a thin line shield member concentrically provided with a center extending on a line extending directly from the center of the light receiving function of the light receiving element to the front is provided on the front surface. The shield case according to claim 6, which is provided. 8. The shield case according to claim 7, wherein the opening has a support member that is provided so as to extend radially with respect to the center thereof and that supports the thin wire shield member. 9. The opening has a circular opening at the center thereof,
The shield case according to claim 8, wherein the tip of the receiver is exposed. 10. The shield case according to claim 6, wherein the opening has an outer diameter that allows a receivable range of the receiving unit to pass therethrough.