JPH10222100A - Picture display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a picture display device capable of supplying electric power and control signal to light emitting elements by a simple structure. SOLUTION: In a picture display device, which rotates a moving body with a plurality of light emitting elements are arranged thereon and displays a picture by making the light emitting elements emit light based on a record of an image storage memory, a rotary connector 14 using mercury contacts is installed in power supply lines 68, 70, 76, 78 to the light emitting elements. Moreover, a control signal is superimposed on a direct current of power supply line 68 by a data modulation circuit 64 modulating a control signal from a control circuit to output the control signal to the light emitting elements. Further, a control signal is taken out of the power supply line 76 for driving the light emitting elements by a data demodulator circuit 82 which is installed on the side of the moving body and demodulates a control signal from the power supply line 76.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device for displaying an image of a character, a numeral, a figure, or the like by emitting light from a light emitting element.

[0002]

2. Description of the Related Art Conventionally, there has been known an image display apparatus which displays an image in space by utilizing the afterimage phenomenon of the human eye.
In such an image display device, for example, Japanese Utility Model Laid-Open No. 4-10
As disclosed in Japanese Patent No. 4688, a light emitting element is attached to a supporting portion arranged in parallel with a rotation axis in a vertical direction, and the light emission of the light emitting element is controlled by rotating the rotation axis.

In addition, a control circuit and a light emitting element provided on a fixed side are brought into contact with a ring-shaped conductor formed coaxially with the rotation axis with a brush or the like to supply power to the light emitting element and to control the light emitting element. Was supplied.

[0004]

However, in such a conventional device, a large number of ring-shaped conductors, brushes, and the like for supplying power to the light emitting element and for supplying a control signal must be provided. There was a problem that it became complicated.

An object of the present invention is to provide an image display device capable of supplying power and a control signal to a light emitting element with a simple structure.

[0006]

In order to achieve the above object, the present invention takes the following means to solve the problem. That is, in an image display device that rotates a moving body on which a plurality of light emitting elements are arranged and causes the light emitting elements to emit light based on a record in a storage unit to display an image, a rotary connector is connected to a power supply line to the light emitting elements Transmitting means for modulating the control signal from a control circuit for outputting a control signal to the light emitting element and transmitting the modulated control signal to the power supply line; and An image display device is provided with a receiving unit for extracting a signal by demodulation.

The rotary connector may use a mercury contact, or the power supply line may supply DC power.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG.
h denotes a light emitting element, and a light emitting diode or the like is used as the light emitting elements 1a to 1h.

The moving body 2 is connected to a rotating shaft 6 of a motor 4, and a plurality of light emitting elements 1 a to 1 h are arranged in parallel with the rotation center of the rotating shaft 6. Further, a detection plate 10 that is rotated by the rotating shaft 6 is provided.
Is provided with a position sensor 12 that detects a slit formed in the sensor and outputs a signal corresponding to the rotation angle.

The moving body 2 is provided with a rotary connector 14 for exchanging signals between the light emitting elements 1a to 1h and the outside of the moving body 2 coaxially with the center of rotation. As shown in FIG. 2, the rotary connector 14 includes an outer cylinder 16 formed of an insulator, and a rotating shaft 18 connected to the moving body 2 has a pair of bearings 20, 2 in the outer cylinder 16.
2 so as to be rotatable.

An insulating ring 24 is fitted on the rotating shaft 18 in the outer cylinder 16, and a pair of annular grooves 26 and 28 are formed on the outer periphery of the insulating ring 24. Double annular groove 2
Conductive rings 30 and 32 are housed on the bottom surfaces of the conductive rings 6 and 28, respectively, and one ends of lead wires 34 and 36 are connected to the conductive rings 30 and 32, respectively. Lead wire 34,3
6 is drawn out through an insertion hole 38 formed in the axial direction of the rotating shaft 18.

The two annular grooves 26 and 28 have two conductive rings 3 respectively.
Conductors 40 and 42 are arranged so as to face 0 and 32, and one ends of lead wires 44 and 46 are connected to both conductors 40 and 42. The lead wires 44 and 46 are drawn out of the outer cylinder 16. Mercury 48 and 49 are filled in both annular grooves 26 and 28, respectively.

Further, the light emitting elements 1a to 1h, the motor 4, and the position sensor 12 are connected to an electronic control circuit 50. The electronic control circuit 50 includes a well-known CPU 52, ROM 54, R
The AM 56 and an image storage memory 58 as a storage means are formed as a center of a logical operation circuit, and an input / output circuit 60 for performing input / output with the outside is mutually connected via a common bus 62.

The CPU 52 inputs signals from the position sensor 12 through the input / output circuit 60, and based on these signals, the recording in the ROM 54, the RAM 56, and the image storage memory 58, and a control program stored in advance.
U52 outputs a drive signal to the light emitting elements 1a to 1h and the motor 4 via the input / output circuit 60, the data modulation circuit 64, and the motor drive circuit 66.

As shown in FIG. 3, the data modulation circuit 64 is connected to a pair of power supply lines 68 and 70 connected to a DC power supply (not shown). Positive power supply line 6
8 is provided with an inductor 72, and both power supply lines 68 and 70 are connected to the lead wires 44 and 4 of the rotary connector 14.
6 is connected. One of the data modulation circuits 64 is connected via a capacitor 74 to a power supply line 68 between the inductor 72 and the rotary connector 14.

The other lead 3 of the rotary connector 14
Reference numerals 4 and 36 are connected to a pair of power supply lines 76 and 78 provided on the moving body 2 side. Positive power supply line 7
6, a data demodulation circuit 82 is connected to a power supply line 76 between the rotary connector 14 and the inductor 80 via a capacitor 84. The control signal from the data demodulation circuit 82 is connected so as to be input to the light emitting element drive circuit 86.

The data modulation circuit 64 is a circuit that modulates a binary digital control signal from the CPU 52 into a signal having no DC component and superimposes it on the power supply lines 68 and 70 as shown in FIG. Even after the control signals are superimposed, they are superimposed so that the DC power does not change. In this embodiment,
Data modulation circuit 64, inductor 72, capacitor 74
The transmission means 88 is constituted by.

On the mobile unit 2 side, a data demodulation circuit 8
2 takes out a control signal in which a DC component is separated from the power supply lines 76 and 78, demodulates the control signal into a digital control signal, and outputs the digital control signal to the light emitting element drive circuit 86. The light emitting element drive circuit 86 drives the light emitting elements 1a to 1h corresponding to the control signal,
The lighting is performed by the power supplied from the power supply lines 76 and 78. The receiving means 90 is composed of the inductor 80, the data demodulation circuit 82, and the capacitor 84.

Next, the operation of the image display device of the present embodiment will be described. First, when the motor 4 is driven to rotate,
The moving body 2 starts rotating. Then, the position sensor 12 outputs a signal corresponding to the rotation angle, and the CPU 52 reads an image signal corresponding to the rotation angle from the image storage memory 58 and outputs the image signal to the data modulation circuit 64 via the input / output circuit 60.

The data modulation circuit 64 converts the control signal from the CPU 52 into a signal having no DC component, and superimposes the modulated signal on the DC current of the power supply line 68 on the positive side. This current is supplied to the moving body 2 via the power supply lines 68 and 70, the leads 44 and 46, the conductors 40 and 42, the mercury 48 and 49, the conductive rings 30 and 32, and the leads 34 and 36. 76 and 78.

The data demodulation circuit 82 separates the control signal from the power supply lines 76 and 78 and demodulates the control signal into a digital control signal. This control signal is output to the light emitting element driving circuit 86, and the light emitting element driving circuit 86 turns on the light emitting elements 1a to 1h according to the control signal.

As described above, in the image display device of the present embodiment, the control signals for the light emitting elements 1a to 1h are
4 and superimposed on the direct current of the power supply lines 68 and 70. The power is supplied to the power supply lines 76 and 78 on the moving body 2 via the rotary connector 14, and the data demodulation circuit 82 separates and extracts the control signal from the power supply lines 76 and 78.

Therefore, the inside of the moving body 2 and the outside may be connected by two power supply lines 68, 70, 76, 78.
The structure becomes simple. Further, the rotary connector 14 using the mercury 48, 49 has a small contact resistance and generates very little noise, so that it is possible to reduce the adverse effect on the control signal.

As described above, the present invention is not limited to such an embodiment, and can be implemented in various modes without departing from the gist of the present invention.

[0025]

As described in detail above, the image display apparatus of the present invention has the advantage that the structure can be simplified by connecting the inside and the outside of the moving body with two power supply lines. In addition, since the rotary connector has a small contact resistance and generates very little noise, it is possible to reduce adverse effects on control signals.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an image display device as one embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the rotary connector according to the embodiment.

FIG. 3 is a circuit diagram illustrating a transmitting unit and a receiving unit according to the embodiment;

FIG. 4 is an explanatory diagram of a signal waveform obtained by superimposing a control signal on a power supply line of the embodiment.

[Explanation of symbols]

 1a to 1h: Light emitting element 2: Moving body 12: Position sensor 14: Rotary connector 26, 28 ... Annular groove 48, 49 ... Mercury 50: Electronic control circuit 58 ... Image storage memory 64 ... Data modulation circuit 68, 70, 76, 78 power supply line 82 data demodulation circuit 88 transmitting means 90 receiving means

Claims (3)

[Claims] 1. An image display device for displaying an image by causing a light emitting element to emit light based on a record in a storage unit while rotating a movable body on which a plurality of light emitting elements are arranged, a power supply line to the light emitting element Transmitting means for interposing a rotary connector, modulating the control signal from a control circuit for outputting a control signal to the light emitting element, and transmitting the modulated control signal to the power supply line; and the power supply line provided on the moving body side. Receiving means for demodulating the control signal from the receiver. 2. The image display device according to claim 1, wherein the rotary connector uses a mercury contact. 3. The image display device according to claim 1, wherein the power supply line supplies DC power.