JPH04140818A - Coordinate reader - Google Patents

Abstract

PURPOSE:To improve the operability of a cordless coordinate indicator, and also, to realize a long service life of a battery power source by providing a coordinate indicator actuating means on a coordinate detecting plate, and also, providing an excitation coil operating means on the coordinate indicator. CONSTITUTION:When a device power source is turned on, a coordinate indicator actuating means 12d of a coordinate detecting plate 12 operates, and applies an excitation coil actuating signal S2 of a coordinate indicator 11 consisting of a prescribed pulse train (code) to a coordinate detecting line 12b in a prescribed period. As a result, the signal S2 is generated from the plate surface 12a in a prescribed period. Subsequently, in such a state, when a stylus pen 11 (detecting coil 11c) is brought close to the plate surface 12a of the detecting plate 12, an arithmetic control circuit 11e detects it through a coil 11c and an amplifier 11d, supplies a battery power source 11a to an excitation coil 11b, and generates an alternating field S1 from the coil 11b. In such a way, an instruction coordinate on the plate surface 12a of the detecting plate 12 instructed with a stylus pen 11 can be detected, the operability of the coordinate indicator is improved, and also, a long service life the battery power source can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an electromagnetic induction type coordinate reading device in which a coordinate indicator is cordless by being powered by a battery.

[Prior Art] Conventionally, there has been an electromagnetic induction type coordinate reading device that operates an excitation coil using battery power to generate an alternating magnetic field, making the coordinate indicator cordless and improving the operability of indicating coordinates. .

[Problems to be Solved by the Invention] However, in the conventional coordinate reading device equipped with this type of cordless coordinate indicator, the battery power of the coordinate indicator is turned on and off using a switch provided on the coordinate indicator. was.

For this reason, not only is it troublesome to operate the switch, but it is also often forgotten to turn it off, posing the problem of wasting battery power.

An object of the present invention is to provide a coordinate reading device that can improve the operability of a cordless coordinate indicator and extend the life of a battery power source.

[Means for Solving the Problems] The above object is to provide the coordinate detecting plate with coordinate indicator starting means for generating a starting signal for the excitation coil of the coordinate indicator at a constant cycle from the plate surface, and to To detect the coordinates, each time an excitation coil activation signal from the coordinate indicator activation means is detected, battery power is supplied to the excitation coil of the coordinate indicator for a certain period of time to activate the excitation coil and generate an alternating magnetic field. This is achieved by providing the plate with excitation coil actuating means that enable the detection of indicated coordinates on the plate surface.

[Function] The coordinate indicator activation means generates an activation signal for the excitation coil of the coordinate indicator from the plate surface of the coordinate detection plate 9 at a constant cycle, and the excitation coil activation means in the coordinate indicator, Every time an excitation coil activation signal from the coordinate indicator activation means is detected, the excitation coil activation power of the coordinate indicator is supplied for a certain period of time (7), the excitation coil is activated, and an alternating magnetic field is generated to generate an alternating magnetic field. Enables detection of indicated coordinates on the board surface.

That is, the coordinate indicator automatically supplies the excitation coil operating power I7 for a certain period of time in response to the excitation coil activation signal from the coordinate detection plate, and enables the detection of the indicated coordinates on the surface of the coordinate detection plate. When the excitation coil activation signal disappears, the supply of excitation coil activation power is automatically stopped after a certain period of time after the excitation coil activation signal is last received.

This eliminates the need to operate the on/off switch to turn on and off the battery power of the coordinate indicator, so there is no need to forget to turn off the switch (and there is no need to waste battery power).

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a coordinate reading device according to the present invention. In this FIG. 1, 11 is a battery power source 1.
A cordless coordinate indicator, in this case a stylus pen, generates an alternating magnetic field by activating an excitation coil 1 lb by 1 a. 11c is a detection coil; ild is an amplifier that amplifies the signal from the detection coil ile; ), an arithmetic control circuit outputs an oscillation signal of a predetermined frequency (for example, 30 Hz) for a certain period of time (for example, 1 second); , these constitute excitation coil actuating means.

Note that during the output period of the oscillation signal, the arithmetic control circuit 11e supplies the battery power source i-3,a which is the operating power source to the excitation coils 1],b.1. An alternating magnetic field S] is generated from the excitation coil llb via the driver and driver lif.

Reference numeral 12 denotes a coordinate detection plate, which detects the alternating magnetic field S from the coordinate indicator 11 with a coordinate detection line 2b drawn on the plate surface i2a, and detects the plate surface 12at indicated by the coordinate indicator 11.
The coordinates of are read by the coordinate reading circuit 12C. Reference numeral 12d denotes a coordinate indicator starting means, which applies an excitation filter 1 of the coordinate indicator 11 consisting of a predetermined pulse train (hood) to the coordinate detection line 12b.
．． 1. b The activation signal S2 is given at a constant cycle (eg, 0.5 second cycle).

Next, the operation will be described. Since the normal coordinate reading operation is the same as that of the conventional device except that the operation is performed between the generation of the excitation coil activation signal 82, the explanation thereof will be omitted, and here, the coordinate indicator Operations related to improving the operability of the battery power supply 11 and extending the life of the battery power supply 11a will be described.

First, when the device power is turned on, the coordinate indicator activation means 12d of the coordinate detection plate 12 is activated 1, and the excitation coil activation signal S2 of the coordinate indicator 11 consisting of a predetermined pulse train (code) is sent to the coordinate detection line 12b at a constant cycle. Give with. This results in
The L period excitation coil starting signal S2 is generated from the plate surface 12a at a constant cycle. Next, in this state, when the stylus pen 11 (detection coil 11c) is brought close to the plate surface L2a of the coordinate detection plate 12, the arithmetic control circuit 1.1e detects it via the detection coil llc and the amplifier lid. , excitation filter j
A battery power supply 11a is supplied to the lb, and an alternating magnetic field S1 is generated from the excitation coil 11b. This makes it possible to detect the designated coordinates on the plate surface 12a of the coordinate detection plate 12 designated by the stylus pen 11.

Here, the alternating magnetic field S1 from the excitation coil llb is generated for a certain period of time every time the excitation coil activation signal S2 is detected. Therefore, if the device power supply is cut off or the stylus pen 11 is moved away from the plate surface 12a of the coordinate detection plate 12, and the excitation coil activation signal S2 is no longer detected in the arithmetic control circuit lie, the excitation coil activation signal S2 is finally detected. Excitation coil ll after a certain period of time after receiving S2
The supply of the battery power source 11a to the battery power source 11a will be automatically stopped.

In the above embodiment, the excitation coil llb and the detection coil l
lc may be configured separately, or both may be configured with one coil.

[Effects of the Invention] According to the present invention, battery power is automatically supplied to the excitation coil of the coordinate indicator by the excitation coil activation signal from the coordinate detector, and is constant for each detection of the excitation coil activation signal. Since only the time is used, there is no need to operate the switch in the conventional device, and thus there is no need to forget to turn off the switch, which has the effect of improving the operability of the coordinate indicator and extending the life of the battery power source.

Note that since the excitation coil activation signal of the coordinate indicator is generated at regular intervals, the power consumption therefor can be suppressed to the minimum necessary, and the present invention can be applied without changing the coordinate detection line configuration of the coordinate detection plate.

Further, since the power source on the coordinate detection plate side that generates the excitation coil activation signal is not a battery power source, there is no problem that occurs with a cordless coordinate indicator.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the apparatus of the present invention. 11... Cordless coordinate indicator (stylus pen)
, 11a...Battery power supply, llb...Excitation coil, 1
1c...detection coil, lid...amplifier, lie...
...Arithmetic control circuit, llf...driver, Sl...
Alternating magnetic field, 12... Coordinate detection plate, 12a... Plate surface of coordinate detection plate, 12b... Coordinate detection line, 12c - Coordinate reading circuit, 12d... Coordinate indicator starting means, S2... Excitation Coil activation signal. Patent applicant Hitachi Seiko Co., Ltd.

Claims (1)

[Claims] 1. A cordless coordinate indicator that generates an alternating magnetic field when the excitation coil is activated by battery power, detects the alternating magnetic field from this coordinate indicator, and reads the coordinates on the board indicated by the coordinate indicator. In the electromagnetic induction type coordinate reading device comprising a coordinate detection plate, the coordinate indicator activation is provided on the coordinate detection plate and generates an activation signal for an excitation coil of the coordinate indicator from a plate surface of the coordinate detection plate at a constant cycle. and means provided in the coordinate indicator, each time an exciting coil starting signal from the coordinate indicator starting means is detected, battery power is supplied to the exciting coil for a certain period of time to activate the exciting coil and generate an alternating magnetic field. A coordinate reading device comprising an excitation coil actuating means that generates an excitation coil and enables the coordinate detection plate to detect designated coordinates on the plate surface.