KR101756185B1

KR101756185B1 - Apparatus for linear encoder using imaging sensor

Info

Publication number: KR101756185B1
Application number: KR1020150092922A
Authority: KR
Inventors: 우성용; 김삼환; 문제일
Original assignee: 재단법인대구경북과학기술원
Priority date: 2015-06-30
Filing date: 2015-06-30
Publication date: 2017-07-10
Also published as: KR20170002951A

Abstract

The present invention relates to a linear encoder apparatus, and more particularly, to a linear encoder apparatus using an imaging sensor.
A linear encoder device of a scaleless type using an imaging sensor according to the present invention includes an imaging sensor for recognizing a pixel change and obtaining pixel information, a switch for switching pixel information into a displacement signal, And a driving unit for outputting a driving signal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a linear encoder,

The present invention relates to a linear encoder device, and more particularly to a linear encoder device using an imaging sensor and not having a scale.

The driving of a robot or a motor according to the prior art includes circular motions, but it has been proposed that mechanical or motor itself can perform linear motion.

Robots using linear motors are applied to various fields such as injection pump, feeder, processing machine, and factory automation due to linear drive.

In order to perform the linear drive control according to the related art, an encoder is mounted as a structure for performing each position recognition. In general, a method using a rotary encoder mounted on a rotary motor and a linear encoder equipped with a linear scale and a lead head A method of using it has been proposed.

According to the prior art, the magnetic field type or optical linear encoder is divided into a scale and a read head as its basic structure.

The read head recognizes the position information by reading the response received from the scale. The magnetic field method recognizes the movement information according to the change of the N pole and the S pole attached to the scale. The optical type recognizes the movement information by using the light sent from the lead head And recognizes the position.

The linear encoder according to the related art has been recently proposed to cope with a scale of a magnet of a linear motor or to use a certain prosthetic device in a manner that can not be driven without a scale. However, Is still present.

These scales are difficult to mount at each part when manufactured, and are susceptible to damage due to foreign substances or external factors.

For example, when a glass is used in a high-precision scale in an optical encoder, there is a problem that it is not easy to store if the length is long, and there is a problem that it is fragile due to high brittleness.

In addition, a general SUS material also has a problem in that when an external stain or foreign substance is applied, an error occurs in the recognition of the position information in the relevant part.

Magnetic field type linear encoders are vulnerable to foreign materials such as iron or metal, and there is a problem that there is a vulnerability to scale scratches such as optical linear encoders.

In addition, the scale is a burden factor of the transport price in medium and long distance transport, and the longer the transport distance, the more the additional price is generated and the installation cost is increased.

It is an object of the present invention to provide a linear encoder device which does not have a separate physical scale by recognizing a pixel change using an imaging sensor.

A linear encoder apparatus using an imaging sensor according to the present invention includes an imaging sensor for recognizing a pixel change and acquiring pixel information, a switching unit for switching pixel information to a displacement signal, and a drive unit for outputting a drive signal to the linear encoder And a drive unit for driving the motor.

According to the configuration of the present invention, it is possible to receive position information on a plurality of axes by using an imaging sensor without having a separate physical scale, and to realize a single product using the acquired two-axis position information So that it is possible to drive two motors, thereby minimizing the number of components and increasing the economical efficiency.

According to the present invention, it is possible to implement a linear encoder by simply mounting an imaging sensor without an additional mechanism or a magnet (magnet), and it is possible to realize a linear encoder without gain of physical scale This is highly effective.

In addition, according to the present invention, since there is no physical scale and no measures for preventing scale damage are provided, durability is high and management is easy.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

1 is a block diagram showing a non-scale linear encoder apparatus using an imaging sensor according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, advantages and features of the present invention and methods of achieving them will be apparent from the following detailed description of embodiments thereof taken in conjunction with the accompanying drawings.

The present invention may, however, be embodied in many different forms and should not be construed as being limited to the exemplary embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, And advantages of the present invention are defined by the description of the claims.

It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprises "and / or" comprising ", as used herein, unless the recited component, step, operation, and / Or added.

1, a non-scale linear encoder apparatus using an imaging sensor according to an embodiment of the present invention includes an imaging sensor 100 for recognizing a pixel change and acquiring pixel information, And a driving unit 400 for outputting a driving signal to the linear encoder using the displacement signal.

The imaging sensor 100 according to the embodiment of the present invention is an imaging sensor used for a mouse, a trackball, and the like, and recognizes the information (pixel change) on the X axis and the Y axis due to the characteristics of the imaging sensor 100.

That is, according to the present invention, position information of up to two axes can be transmitted to one sensor.

The linear encoder device using the imaging sensor according to the embodiment of the present invention does not have a physical scale and is characterized in that it includes an imaging sensor 100 that recognizes a pixel change by having a calculation formula itself.

The imaging sensor 100 is based on an optical system and uses any one of an LED, a laser, and an infrared ray as a light source. The imaging sensor 100 acquires pixel information by recognizing a pixel change in the X and Y axes and transmits the pixel information to the switching unit 300.

The switching unit 300 converts the pixel information into a displacement signal and transmits it to the driving unit 400, which is converted into a signal that can be recognized by the driving drive or the controller.

The switching unit 300 receives the pixel information from the imaging sensor 100, and uses the positional information of each axis to convert it into a displacement signal.

The driving unit 400 according to the embodiment of the present invention can drive two motors according to the use of the imaging sensor 100 for reading X-axis and Y-axis information as described above, A drive signal, at least one of a line drive signal, a drive digital signal, a drive serial communication signal, and a drive analog signal to drive the linear encoder.

In this case, the driving unit 400 for outputting the driving analog signal includes a DAC.

According to an embodiment of the present invention, it is preferable to further include a signal filter 200 for performing noise removal on at least one of the pixel information and the displacement signal.

For example, the signal filter 200a for the pixel information is disposed between the imaging sensor 100 and the switching unit 300, and the signal filter 200b for the displacement signal is disposed between the switching unit 300 and the driving unit 400 And performs the function of removing noise from the pixel information acquired by the imaging sensor and the signal output by the switching unit.

The embodiments of the present invention have been described above. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

100: imaging sensor 200: signal filter
300: switching part 400: driving part

Claims

An imaging sensor for recognizing pixel changes of each of the X and Y axes to obtain pixel information;
A switching unit which receives the pixel information and converts the position information to a displacement signal using position information about each axis; And
And a drive unit for outputting the drive signal for driving the two motors as a drive signal for the linear encoder using the displacement signal,
And an imaging sensor including the imaging sensor.

delete

The method according to claim 1,
The imaging sensor is based on an optical type and uses either an LED, a laser or an infrared ray as a light source
Scale - free Linear Encoder Device Using Imaging Sensor.

delete

The method according to claim 1,
The driving unit receives the displacement signal and drives the linear encoder by outputting the driving signal, which is at least one of a driving line drive signal, a driving digital signal, a driving serial communication signal, and a driving analog signal
Scale - free Linear Encoder Device Using Imaging Sensor.

The method according to claim 1,
And a signal filter for performing noise removal on at least one of the pixel information and the displacement signal
Scale - free Linear Encoder Device Using Imaging Sensor.