JPH0221779Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a volume control device for controlling the up/down and control speed of an electronic volume by one-action operation.

Electronic volume devices electronically vary the level of input signals and output them by applying external control signals, and because they do not have an input part, they are compact and have improved durability. It is used in various devices. As external control signals to be supplied to this electronic volume device, it is necessary to supply an up signal, a down signal, and a control speed signal.

FIG. 1 is a circuit diagram showing an example of an electronic volume device commonly used in the past.
Reference numeral 3 designates down, high speed and up switches connected between the power supply Vcc and ground via pull-up resistors 4, 5 and 6, respectively. Reference numeral 7 denotes an electronic volume, which electronically adjusts the level of the input signal supplied to the amplifier 8 in response to each input signal by inputting the outputs of the switches 1 to 3 as a down signal, high speed signal, and up signal. It has a signal amount adjustment circuit 10 that controls a variable section 9 that varies the amount.

In a device configured in this way, when the output signal level is lowered, the down switch 1 is
and operate the amplifier switch 3 for up operation. Next, when increasing the down or up speed, the high speed switch 2 and the down switch 1 or up switch 3 are operated simultaneously.

However, in the above configuration, an independent switch is required for each control mode, and when controlling the control speed in multiple stages, there are many switches and multiple actions are required to operate them. Problems such as these arise and the situation becomes complicated.

Therefore, an object of this invention is to provide an electronic volume control device that can easily perform multiple controls with a single action. Hereinafter, the electronic volume control device according to this invention will be explained in detail with reference to the drawings.

FIG. 2 is a perspective view of essential parts of an embodiment of the electronic volume control device according to this invention. In the figure, reference numeral 11 is an encoding board made of a longitudinal plate, and an encoding pattern is provided on the surface of the encoding board. FIG. 3 is a plan view showing the encode pattern of the encode board 11, in which a part of the encode pattern extends in the width direction of the encode board 11 in the central part in the longitudinal direction, and a part thereof extends in the longitudinal direction of the encode board 11. It has an extending common pattern A, and encode patterns B1 and B2 that are independent from each other and have different lengths and extend in the longitudinal direction of the encode board 11. The common pattern A is drawn out to the common terminal 11a, and the encode patterns B1 and B2 are drawn out to the encode terminals 11b and 11c, respectively. 12 is an operation button,
It has almost the same planar shape as the encode substrate 1, and the lower surface thereof is formed into an arc shape and serves as a conductive surface 13. This conductive surface 13 may be formed by the operation button 12 itself being a conductor, or by electrodepositing a conductive material, for example. The operation button 12 is placed on the encoder board 11, and tension springs 14a and 14b are provided at both longitudinal ends of the operation button 12, respectively.

In the electronic volume control device configured in this way, under normal conditions, the operation button 12 is connected to the encoder board 1 by the springs 14a and 14b.
It is horizontal to 1. Therefore, the only contact portion with the encode board 11 is the common pattern A provided in the center of the encode board 11 and extending in the width direction. In other words, the conductive surface 13 of the operation button 12
Since it is an arcuate surface having a width of 1, the contact portion is in the form of a line perpendicular to the encode board 11, and under normal conditions, this contact line portion is superimposed on the common pattern A. . Therefore, in this state, the encode output terminal 11
Encoding pattern B connected to b, 11c
1 and B2 are all open, and no output signal is generated.

Next, for example, if the up side X of the operating button 12 is pushed down a little, the operating button 12 will be tilted to the left. And this operation button 1
2 is caused by the arc-shaped conductive surface 13 rolling on the surface of the encoder substrate 11, so that the contact line of the conductive surface 13 with the encoder substrate 11 is tilted to the left. will move in the direction. As a result, as the contact line moves to the left, the longest encode pattern B2 and common pattern A are first connected, and an output signal is generated from a part of the encode terminal 11c. Ru. Next, when the operating force of the operating button 12 is further increased, the operating button 12 is tilted further to the left, and the contact line portion is accordingly moved further to the left. When this contact line portion is further moved to the left, the number of encode patterns B2 that are in contact with the common pattern A increases, and accordingly, the encode output end 1
The number of outputs generated from 1c increases. Therefore,
The output signal generated at the encode output terminal 11c represents an up signal, and its output number can represent an up speed. This also applies when the down side Y is operated, and the operating force of the operating button 12 instructs the output change speed.

FIG. 4 is a circuit diagram showing a state in which the electronic volume control device according to the invention shown in FIG. 2 is connected to an electronic volume, and the same parts as in FIG. 1 are shown using the same symbols. In the figure, 15 is a signal conversion circuit, which adjusts the signal amount after converting the down signal generated between the common terminal 11a and the encode terminals 11b and 11c, that is, after converting it into a control signal for the electronic volume 7. It is supplied to the circuit 10.

In the device configured in this way, the moving direction of the contact line part Z is determined by the operating position, and the moving amount changes depending on the operating force, and the down signal 6 associated with this changes. Alternatively, the up signal 6 is supplied to the signal conversion circuit 15. The signal conversion circuit 15 converts the signal supplied from the encode board 11 into a normal electronic volume control signal, and then supplies the signal to the signal amount adjustment circuit 10 to adjust the output signal level. Note that the signal adjustment circuit 10
If the output signal of the encoding board 11 can be handled, the signal conversion circuit 15 is not necessary. Furthermore, the pattern of the encoder substrate 11 is not limited to that shown in FIG. 3, and, for example, patterns shown in FIGS. 5 and 6 may also be used. In this case, up and down signals are taken out from the output ends 16 and 17, and a speed signal is taken out from the output end 18.

As explained above, according to the electronic volume control device of this invention, it is possible to instruct the control direction and control speed by simply changing the operating force of a single operation button, and the operability is improved accordingly. This has the excellent effect of significantly improving the control speed signal and increasing the resolution of the control speed signal.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing an example of a conventional electronic volume device, Fig. 2 is a perspective view showing an embodiment of the electronic volume control device according to this invention, and Fig. 3 is a plan view of the encoder board shown in Fig. 2. 4 is a circuit diagram of a device using the electronic volume control device shown in FIG. 2, and FIGS. 5 and 6 are plan views showing other embodiments of the encoder board. 11... Encoding board, 12... Operation button, 1
3... Conductive surface, 14a, 14b... Spring.

Claims (1)

[Claims for Utility Model Registration] An encoding board on which a plurality of mutually independent encoding patterns of different lengths extend in the longitudinal direction of the board; and an operating means having a conductive surface pressed against the surface of the encoding board. , holding means for holding the operating means in a steady state, and moving the conductive surface in the longitudinal direction on the substrate by operating the operating means against the holding force of the holding means, An electronic volume control device characterized in that it is configured to output a signal indicating an operating direction and an operating force by changing the connection position of an encode pattern on an encode board.