JPH11351913A - Circuit board for encoder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circuit board for an encoder to achieve the reduction of a wiring pattern, improvement in anti-noise characteristics, the miniaturization of the encoder especially by forming A/D converters and a digital signal processing circuit provided on a substrate into one chip. SOLUTION: In this circuit board for an encoder, by forming A/D converters 2 and 3 and a digital signal processing circuit 4 on one and the same chip to be an IC 10, a wiring pattern on the chip among the circuits 2, 3, and 4 becomes minimum, anti-noise characteristics is substantially improved, and it is possible to miniaturize the encoder by the miniaturization of a substrate 1 in constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit board for an encoder, and more particularly, to an A / D converter and a digital signal processing circuit provided on the board in one chip to reduce wiring patterns and improve noise resistance. And a novel improvement for achieving downsizing of the encoder.

[0002]

2. Description of the Related Art As a conventional circuit board for an encoder of this type, for example, as shown in FIG.
A / D converters 2 and 3 and a digital signal processing circuit 4 are independently provided on a substrate 1, and these A / D converters 2 and 3 are provided independently.
The digital signal processing circuit 3 and the digital signal processing circuit 4 are electrically connected to each other by a wiring pattern 5 formed on the substrate 1.

[0003]

The conventional circuit board for an encoder is configured as described above, and therefore has the following problems. That is, since each A / D converter and the digital processing circuit are formed independently on the substrate and are constituted by separate chips, each A / D converter and the digital signal processing circuit must be connected by a wiring pattern. Therefore, the space for mounting other electronic components has been reduced. In addition, since a large number of wiring patterns run, it is easy to pick up external noise, and it has been difficult to improve noise resistance. Also, since it is difficult to reduce the size of the substrate, it is also difficult to reduce the size of the encoder itself.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and in particular, an A / D provided on a substrate.
It is an object of the present invention to provide an encoder circuit board in which a converter and a digital signal processing circuit are integrated into one chip to reduce wiring patterns, improve noise resistance, and reduce the size of the encoder.

[0005]

A circuit board for an encoder according to the present invention comprises an A / D converter for A / D converting an analog output signal obtained from a light receiving element of an encoder;
A digital signal processing circuit for performing signal processing on a digital signal obtained by A / D converting the analog output signal with a / D converter and outputting an encoder signal; The converter and the digital signal processing circuit are integrally formed on an IC on the same chip.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an encoder circuit board according to the present invention will be described below with reference to the drawings. The same or equivalent parts as those in the conventional example will be described with the same reference numerals. In FIG. 1, reference numeral 1 denotes a substrate built in a circular encoder device (not shown), on which one IC 10 having a one-chip configuration is provided. In this IC 10, a pair of A / D converters 2, 3 and a digital signal processing circuit 4 are formed on the same silicon substrate.
Each of the A / D converters 2 and 3 and the digital signal processing circuit 4 are connected by a pattern (not shown) formed on the chip of the SIC (Application specific IC). , A digital encoder output signal is obtained.

[0007]

The circuit board for an encoder according to the present invention has the following features.
With the above configuration, the following effects can be obtained. That is, since each A / D converter and the digital signal processing circuit are integrally formed on one chip provided on the substrate, the ratio of components constituting the circuit occupying the substrate is higher than before. Is also greatly reduced in size, which can contribute to downsizing of the encoder. Further, the wiring pattern connecting each A / D converter and the digital signal processing circuit is significantly smaller and shorter than before, and the noise resistance can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing an encoder circuit board according to the present invention.

FIG. 2 is a plan view showing a conventional circuit board for an encoder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2, 3 A / D converter 4 Digital signal processing circuit 10 IC

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kenichi Tamura 1879 Okyu, Iida City, Nagano Prefecture Inside Tamagawa Seiki Co., Ltd.

Claims (1)

[Claims] An A / D converter (2, 3) for A / D converting an analog output signal obtained from a light receiving element of an encoder,
The analog output signal is converted into an analog signal by the A / D converter (2).
A digital signal processing circuit (4) for processing a digital signal obtained by D conversion and outputting an encoder signal on a substrate (1), wherein the A / D converter (2, 3) And the digital signal processing circuit (4)
A circuit board for an encoder, which is formed integrally with C (10).