JPH0581612U - Linear sensor - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a linear sensor, and in particular, it is characterized in that a slider has a built-in digital conversion section to simplify wiring to a machine tool or the like. [Structure] The linear sensor according to the present invention comprises a slider (4) slidably provided in the longitudinal direction of the fixed body (1) and having a slider side track pattern (3), and a digital output provided on the slider (4). Digital converter that outputs (7c) (20)
It is the structure which has.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a linear sensor, and more particularly to a new improvement for simplifying wiring to a machine tool or the like by incorporating a digital conversion unit in a slider.

[0002]

[Prior Art]

 As a linear sensor of this type which has been conventionally used, the configuration shown in FIG. 6 is generally adopted. That is, a scale-side track pattern 2 is formed on an elongated fixed body 1, and a slider 4 having a slider-side track pattern 3 is provided on the fixed body 1 so as to be reciprocally movable in the direction of arrow A. ing. An amplifier 5 is connected to the scale-side track pattern 2, and the excitation signal 7a of the digital converting section 7 is supplied to the amplifier 5 via the voltage controller 6, and the amplifier 5 supplies the scale-side track pattern 2 Is supplied with two-phase excitation signals 5a and 5b. The two-phase detection signals 3a and 3b (industin signals) having different phases similar to the well-known resolver signal obtained from the slider side track pattern 3 are digitally converted via the first and second operational amplifiers 8 and 9. The two-phase detection signals 3a and 3b are input to the input section 7b of the A / D converter 7 and A / D converted by the digital conversion section 7 and output as the digital output 7c.

[0003]

[Problems to be solved by the device]

 Since the conventional linear sensor is configured as described above, there are the following problems. That is, when the linear sensor 10 configured as shown in FIG. 6 is mounted on a detected object such as a machine tool, since the fixed body, the slider, and the digital converter are three independent components, the scale side track pattern and the slider side are separated. The large number of wires connected to the track pattern complicates the work at the time of mounting and hinders downsizing due to an increase in the number of parts.

The present invention has been made to solve the above problems, and in particular, a linear sensor in which a digital conversion unit is built in a slider to simplify wiring to a machine tool or the like. The purpose is to provide.

[0005]

[Means for Solving the Problems]

 The linear sensor according to the present invention includes a fixed body having a track pattern on the scale side, a slider provided with a track pattern on the slider side slidably provided in the longitudinal direction of the fixed body, and a digital output provided on the slider. And a position display section provided on the slider.

More specifically, an excitation signal is applied from the digital conversion section to the scale-side track pattern.

[0007]

[Action]

 In the linear sensor according to the present invention, the slider is integrally provided with a digital conversion unit for generating an excitation signal to be applied to the scale side track pattern and processing a two-phase detection signal from the slider side track pattern. Therefore, when the linear sensor is mounted on a machine tool, the number of wires is significantly reduced, and the labor for mounting and maintenance can be saved.

[0008]

【Example】

 Hereinafter, preferred embodiments of the linear sensor according to the present invention will be described in detail with reference to the drawings. It should be noted that the same or equivalent portions as those of the conventional example will be described using the same reference numerals. 1 to 5 show a linear sensor according to the present invention, FIG. 1 is an exploded perspective view, FIG. 2 is a sectional view showing a slider, FIG. 3 is a plan view, FIG. 4 is a waveform diagram, and FIG. 5 is a block diagram. Is. In FIG. 5, a reference numeral 1 is a rectangular fixed body, and the fixed body 1 has a scale side track pattern 2 and a slider 4 having a slider side track pattern 3 on the fixed body 1. Is reciprocally movable in the direction of arrow A.

An amplifier 5 is connected to the scale-side track pattern 2, and the excitation signal 7a of the digital converting section 7 is supplied to the amplifier 5 via a voltage controller 6, and the amplifier 5 supplies the scale-side track. The two-phase excitation signals 5a and 5b are supplied to the pattern 2.

Two-phase detection signals 3 a and 3 b (industin signals) having different phases, which are similar to the well-known resolver signals obtained from the slider side track pattern 3, are passed through first and second operational amplifiers 8 and 9. The two-phase detection signals 3a and 3b input to the input section 7b of the digital conversion section 7 are A / D converted by the digital conversion section 7 and output as a digital output 7c.

The above-described amplifier 5, voltage controller 6, operational amplifiers 8 and 9, and digital conversion unit 7 constitute a digital conversion body 20, which is integrated with the slider 4 as shown in FIG. It is provided in a shape.

The two-phase excitation signals 5a and 5b connecting the scale-side track pattern 2 and the amplifier 5 are connected by a linear slip ring (not shown), and signal transmission is achieved regardless of the movement of the slider 4 (arrow A). It is configured to be able to.

The fixed body 1 and the slider 4 are configured as shown in FIG. 1, and the stepped portion 1 a of the fixed body 1 is provided with a recess 4 a of the slider 4 slidably. Since the position display portion 4b such as an LED obtained based on the digital output 7c is provided, the position when the slider 4 is moved is displayed as a real number.

Therefore, when mounting on a machine tool or the like, after mounting the fixed body 1 on the machine tool (not shown) through the mounting hole 1b of the fixed body 1, a power source extended from the fixed body 1 The installation can be completed simply by connecting the wire 1c to the power supply 21.

[0015]

[Effect of the device]

 Since the linear sensor according to the present invention is configured as described above, it is possible to significantly reduce the number of connecting lead wires existing between the slider and the fixed body compared to the conventional one, and it is possible to greatly install the sensor on a machine tool or the like. Can be simplified.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a linear sensor according to the present invention.

FIG. 2 is a cross-sectional view showing a main part of FIG.

FIG. 3 is a plan view.

FIG. 4 is a waveform diagram.

FIG. 5 is a block diagram.

FIG. 6 is a block diagram showing a conventional linear sensor.

[Explanation of symbols]

 1 Fixed body 2 Scale side track pattern 3 Slider side track pattern 4 Slider 4b Position display section 5a, 5b Excitation signal 7c Digital output 20 Digital converter

Claims (2)

[Scope of utility model registration request] 1. A fixed body (1) having a scale side track pattern (2), and a slider (4) having a slider side track pattern (3) slidably provided in the longitudinal direction of the fixed body (1). And a digital output (7
A linear sensor comprising a digital converter (20) for outputting c) and a position display section (4b) provided on the slider (4). 2. The scale side track pattern (2) is configured such that an excitation signal (5a, 5b) is applied from the digital converter (20). Linear sensor.