JPH0493720A - Position measuring apparatus - Google Patents

Abstract

PURPOSE:To realize a small size and to make it possible to select and utilize required functions by providing a master unit, a measuring unit and function units, and providing a constitution wherein each unit is connected to a data bus so that the unit can be freely attached and removed. CONSTITUTION:Various kinds of parameters of all units are stored in a master unit 3 which is connected to duplex data bus 6 so that the unit 3 can be freely attached and removed. The measured position value expressing the position of an object to be measured X is operated in a measuring unit 2A which is connected to the data bus 6 so that the unit can be freely attached and removed and connected to a detecting head part 1 based on the parameters. The specified processings are performed for the measured position values in an analog output unit 4 and a digital input/output unit 5 which are the functional units connected to the data bus 6 so that the units can be freely attached and removed based on the parameters. In this way, only the units having the required functions are assembled, and many kinds of the functions can be used. There is no useless parts, and the low cost and the small size can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a position measuring device that measures the position of an object in a non-contact manner, such as an optical type.

[Conventional technology] The refinement of the conventional example will be explained with reference to FIG.

FIG. 6 is a block diagram showing a conventional position measuring device disclosed in, for example, Japanese Patent Publication No. 56-10561 and Japanese Patent Publication No. 59-762.

In FIG. 6, the conventional position measuring device has a detection head (
1) and a controller section (2) connected to this detection head section (1).

The detection head section (1) includes a light source (1) such as a laser or LED.
0), a light projecting lens (11), a light receiving lens (12), an optical position detecting element (13) called SPD, and amplifiers (14) and 15).

The controller unit (2) includes a light source drive circuit (2o), A/D converters (21) and (22) connected to this light source drive circuit (20), and these A/D converters (2o).
It consists of a CPU (23) connected to 1) and 22).

Note that the light source (10) is connected to the light source drive circuit (2o) and pulse-driven, and is connected to the A/D converter (21) and (2o).
2) are also connected to amplifiers (14) and 15), respectively.

Next, the operation of the conventional example described above will be explained.

The light source (10) is pulse-driven by a light source drive circuit (2o) and generates light that repeatedly turns on and off over time. The light emitted from the light source (1o) is focused by a projection lens (11) and projected onto the surface of the object to be measured X perpendicularly to the surface.

Scattering occurs on general object surfaces other than ideal mirror surfaces.
Bright spots of light can be observed from various angles.

A light receiving lens (12) is placed on the optical axis forming a predetermined angle θ with the projection beam, and an image of the light spot is detected by an optical position detection element (13).
), the optical position detection element (13)
The two output currents 1 and 12 correspond to the position of the light spot on the light receiving surface. These are amplified by amplifiers (14) and (15), and t'L output currents 11 and 12, respectively.
Obtain voltages VAl and VA2 proportional to .

These voltages are input to separate A/D converters (21) and (22), respectively. These A/D converters (21
) and (22) sample the input signal in synchronization with the drive pulse of the light source drive circuit (20) and generate a digital voltage v.
ll+1 and V. Convert to 2. CP[J (23) inputs these and calculates (Vol-VD2)/(Vn++
VB) is calculated to obtain a signal proportional to the scene center of gravity position of the spot light formed on the light receiving surface of the optical position detection element (13), and this is further linearly corrected to determine the measured Z (*
Find the id of X and output it.

[Problem to be solved by the invention] Is the position measurement value basically output as a digital signal? Depending on the application, it may be an analog output, an isolated contact output, or
R3-232C output, etc. may be required, and it is also possible to display measured values, perform calculations such as average processing, maximum and minimum value detection, and differential calculations based on position measurement values, and perform these measurements, There may be cases where it is necessary to set parameters related to calculations.

In the conventional position measuring instrument as described above, the controller section (2) is configured as one block, so in order to be able to meet all of these requirements, all function achieving means must be implemented. The problem is that it is expensive and large in size, and that using only one of these functions is extremely wasteful.

The present invention has been made to solve the above-mentioned problems, and aims to provide an 11-position device that can reduce cost and size and allow selective use of necessary functions.

[Means for solving the problem] The attached measuring device of the present invention according to the first claim is provided with the following means.

r1] A master unit that is detachably connected to the delta path and has various parameters for all units.

(2) A measurement unit that is detachably connected to the data bus, is connected to the detection head section, and calculates a position measurement value representing the position of the object to be measured based on the parameters.

[3] A functional unit 6 which is detachably connected to the data bus and performs predetermined processing on the position measurement value based on the parameters; It is equipped with the following.

[1] A master unit 6 that is detachably connected to the data bus and capable of storing various parameters of all units. [2] A master unit 6 that is detachably connected to the data bus and connected to the detection head section and that can store parameters based on its own parameters. A measurement unit that calculates a position measurement value that represents the position of a measurement object.

[3] A functional unit that is detachably connected to the data bus and performs predetermined processing on the position measurement value based on its own parameters.

The position measuring device of the present invention according to claim 3 is provided with the following means.

[1] A master unit that is detachably connected to a bidirectional data bus and has various parameters for all units.

[2] A measurement unit that is detachably connected to the one-way data bus and the two-way data bus, is connected to the detection head section, and calculates a position measurement value representing the position of the object to be measured based on the parameters.

[3] A functional unit that is detachably connected to the one-way data bus and the two-way data bus and performs predetermined processing on the position measurement value based on the parameters.

[Operation] In the invention according to the first aspect, various parameters of all uni-sotos are stored by the master unit detachably connected to the data bus.

Further, it is detachably connected to the data bus.

A measuring unit connected to the detection head calculates a position measurement value representing the position of the object to be measured based on the parameters.

Furthermore, predetermined processing is performed on the position measurements based on the parameters by a functional unit removably connected to the data bus.

In the invention according to the second aspect, various parameters of all units can be stored by the master unit detachably connected to the data bus.

Further, a measurement unit detachably connected to the data bus and connected to the detection head calculates a position measurement value representing the position of the object to be measured based on its own parameters.

Further, a functional unit removably connected to the data bus performs predetermined processing on the position measurements based on its own parameters.

In the third aspect of the invention, the master unit detachably connects to the bidirectional data bus.
Various parameters of all units are memorized.

Further, a measurement unit detachably connected to the one-way data bus and the two-way data bus and connected to the detection head calculates a position measurement value representing the position of the object to be measured based on the parameters.

Further, a predetermined processing FI is performed on the position measurements based on the parameters by a functional unit removably connected to the unidirectional data bus and the bidirectional data bus.

[Embodiment 1] The structure of an embodiment of the present invention according to the first claim will be described with reference to FIG.

FIG. 1 is a block diagram showing a first embodiment of the present invention according to the first claim, and the detection section (1) is completely the same as that of the conventional example.

In FIG. 1, an embodiment of the present invention according to claim 1 has measuring units (2
A), a master unit (3), an analog output unit (4), and a digital input/output unit h (5).

The measurement unit (2A) includes a light source drive circuit (20), an A/D circuit connected to the light source drive port IK (20), and amplifiers (14) and (15) of the detection head (1), respectively.
A CPU (23) connected to the D converters (21) and (22), these A/D converters (21) and (22), and the bidirectional data bus (6);
23> and a nonvolatile memory (24) connected to the memory. Note that the light source drive circuit (20) is also connected to the light source (10) of the detection head section (1) in order to supply drive pulses.

The master unit (3) includes a CPU (30) connected to a bidirectional data bus (6), and a CPU (30) connected to a bidirectional data bus (6).
Display unit (31) connected to the setting input keyboard (3
2) and a ROM (3B).

The analog output unit (4) is connected to the bidirectional data bus (6
) connected to the CPU (40) and this CPU (40)
) and a non-volatile memory (42).

The digital input/output crab unit (5) connects the CPU (50) connected to the bidirectional data bus (6) and
It is composed of an I/F (51) connected to (50) and a nonvolatile memory (52). In addition, T/F (5)
, ) is a digital signal isiter face of one of TTL parallel, R3-232C, photocoupler, etc.

The bidirectional data bus (6) exchanges data between units, and there are a predetermined number of connection positions for units, and each unit can be installed and operated at any position.

The non-volatile memories (24), (42) and (52) described above
) is EEPROMMR? battery backed ram
It is a rewritable memory such as

By the way, the IR function unit of the present invention according to the first claim is composed of an analog output unit (4) or a digital input/output unit (5) in the above-mentioned embodiment of the present invention according to the first claim. .

Next, the operation of the above-described embodiment will be explained.

The measurement values determined by the measurement unit (2A) are output to the bidirectional data bus (6).

The master unit (3) takes in the measured values on the bidirectional data bus (6), averages them, and displays them on the display (31).
Output to.

Similarly, the analog output unit (4) takes in the measured values on the bidirectional data bus (6) and the D/A converter (
41) to convert it into an analog voltage or current and output it.

In addition, the child digital input/output uni-soto (5) takes in the measured values on the bidirectional data bus (6), ■, 'F('';
1) Output the measured value to the outside.

In Master Units 1-(3), use the settings input keychain (
Various parameters can be set through the bidirectional data bus (6), and the settings are sent to the target unit through the bidirectional data bus (6) and stored in the non-volatile memory (2) of that unit.
4), (42) or (52). That is, the operation of the CPU (30) is controlled by the ROM (33) in the unit.
), and information regarding the various parameter settings of each unit, such as the total number of setting items, setting item number corresponding to each setting item, setting item name, one type of key used, etc.・All default values are included in this program.

In addition, digital signals input from the outside to the digital input/output unit (5) are sent to the master unit (3) 4 via the bidirectional data bus (6), and the setting operation is similar to that of the setting input keyboard (32). enable.

All of the aforementioned units are not necessary for operation as a position measuring device, and can be operated by being attached to any connection position provided on the bidirectional data bus (6).

In one embodiment of the present invention related to the iW requirement, as described above, the units 7 are divided according to functions, and the bidirectional data bus (6) for signal transmission between these units 71 is configured. established,
Since any type and number of units can be installed on this bidirectional data bus (6), it is possible to combine only the units with the necessary functions and use a wide variety of functions. , there is no waste, and it is possible to realize low cost and small size.

Next, the configuration of an embodiment of the present invention according to the second claim will be described with reference to FIG.

FIG. 2 is a block diagram showing an embodiment of the present invention according to claim 2, and the detection head section (1) is completely the same as that of the conventional example.

In FIG. 2, an embodiment of the present invention according to claim 2 has measuring units (2
B), master unit (3A), analog output crab knit (4A), and digital input and output crab knit (5A)
It is composed of.

The master unit (3A) includes a non-volatile memory (3A) in the master unit (3) of the embodiment of the invention according to the first claim.
4) has been added.

Measuring unit (2B), analog output crab unit (4A)
) and the digital input/output crab knit (5A) are the measurement unit (2A), the analog output crab knit (4), and the digital input/output crab knit (
ROMs (25), (43) and (5) in place of the non-volatile memories (24), (42) and (52), respectively.
53).

By the way, the functional unit of the present invention according to the second claim is composed of an analog output crab unit (4A) or a digital input/output crab unit (5A) in the above-described embodiment of the invention according to the second claim.

Next, the operation of the above-described embodiment will be explained with reference to FIG.

FIG. 3 is a table diagram showing the contents of the ROM in the measuring unit (2B), the analog output unit (4A), and the digital input/output unit (5A) in one embodiment of the present invention according to the second claim.

In Fig. 3, each ROM stores in advance the total number of setting items, setting item number corresponding to each setting item, setting item name, one type of key to be used, etc., default value as parameter setting related information. There is.

The basic operation is the same as the embodiment of the invention according to the first claim.

The CPU (30) of the master unit (3A) is RO
It operates according to the program written in M(33). However, information regarding parameter settings for each unit is available at (J
It is not built-in and has a function of recording only the parameter values set in the non-volatile memory (34).

Measurement unit (2B) - analog output crab unit (4A)
The digital input/output crab unit (5A) stores the information necessary for its own parameter settings in each R and OM.
(25), (43) and (53). FIG. 3 specifically shows the contents of information related to parameter settings stored in the ROM of each unit, each of which is recorded as a numerical value or character string.

Before starting the setting operation, the master unit (3A)
A command is issued to each unit in turn to transmit the information shown in FIG.
The communication stored in 4) is normally performed when the power is turned on. Therefore, this stored content does not disappear when the power is turned off.

When a setting operation request is received from the keyboard or digital input, the MASDER UNI V1-(3A) performs a parameter setting operation based on the setting information obtained as described above. All set values are recorded in the non-volatile memory (34) in the master unit <3A), and when = is requested from each unit as required, the master unit (3A)
is transferred to the relevant unit.

In the embodiment of the present invention according to the second claim, as described above, each unit has information regarding parameter settings, so a unit with a new specification can be installed without replacing the master unit (3A). It is possible to add settings or change the specifications of setting items, making it highly adaptable to version upgrades.In addition, setting contents can be stored in the non-volatile memory (34
), there is no need for each unit to have a non-volatile memory, which is advantageous in terms of cost and size.

Next, the structure of an embodiment of the present invention according to the third claim will be explained with reference to FIG.

FIG. 4 is a block diagram showing an embodiment of the present invention according to claim 3, and the detection head section (1) is completely the same as that of the conventional example.

In FIG. 4, an embodiment of the present invention according to claim 3 has measuring units (2
C), a master unit (3), and an arithmetic unit (7).
) and a digital input/output crab knit (5B). Furthermore, the measurement unit (2C) and the calculation unit (7) are connected to each other by a unidirectional data bus (8A), and the calculation unit (8A) and the digital input/output unit (5B) are connected to each other by a unidirectional data bus (8B). The digital input/output unit (5B) and other units (not shown) are connected to each other by a unidirectional data bus (8C).

The base (9) mechanically holds each unit and has a bidirectional data bus (6) and unidirectional data buses (8A) to (8C).

The master unit I (3) is the same as the first embodiment of the invention according to the first claim.7 The measurement unit t-(2C), the arithmetic unit (7) and the digital input/output unit (5B) are both data bus (
In addition to the input/output ports with (6), input ports (25), (
71) and (53) and one output port (26), (72), and (54) each, and the output port of one unit and the input port of the adjacent unit are connected to a unidirectional data bus (8A). ~(8C). However, the input cap of measurement unit (2C)
) (Nothing is connected to 25>.Measurement unit (25>)
C) is usually installed at the end in this way to output measured values.

Note that the measurement unit (2C), the calculation unit (7), and the digital input/output unit (5B) are each equipped with a nonvolatile memory for each parameter, although not shown.

In addition, in the measurement unit (2C) and calculation unit (7), the output capo-1-[ is outputted via a large CPU so that the input data can be processed. In order to directly send the child data to the next unit without processing it, the human capo-1 (53) is directly connected to the output port (54).

By the way, the functional unit of the present invention according to the third claim is the arithmetic unit <7) or the digital input/output crab unit (5B) in the above-mentioned embodiment of the present invention according to the third claim.
).

Next, the operation of the above-described embodiment will be explained.

The basic operation is the same as the embodiment of the invention according to the first claim.

The measurement data of the measurement unit (2C) is sent to the output boat (2C).
6) to the unidirectional data bus (8A), and is transmitted to the input port (71) of the adjacent arithmetic unit (7) via this unidirectional data bus (8A).

The arithmetic unit (7) reads measurement data from the input boat (71), performs specified arithmetic processing, and outputs the result to the output boat (72). This data is transferred to the adjacent digital input/output unit via a unidirectional data bus (8B).
71・(5B) to the input boat (53) (5 speeds).

Digital input/output crab knit (513) is input capo-1-
(53) is read and output to the outside via J/F (51). The input boat (53) is connected to the output boat (54).
), the input data to this unit is directly output onto the 4th order unidirectional data bus (8C) and sent to the next unit.

The unidirectional data buses (8A) to (8c) connect only the outputs and human power of the adjacent set of units, and are composed of two or more units, so each one outputs data from the unit of h. Each unit can simultaneously perform an operation that is input to an adjacent unit. Therefore, processing and transmission of these measurement data can be performed in parallel by providing a synchronization clock to each unit.

On the other hand, the external command input to the digital input/output crab unit (5B) is r/F (51).

It is output to the bidirectional data bus (6) via the CPU (50), and is output to the CPtJ (30) of the master uni soto (3).
). Furthermore, commands for setting and operation control from the master unit (3) to each unit are also transmitted to the target unit via the bidirectional data bus (6).

Furthermore, when displaying the measurement data on the display (31), the measurement data is output from the measurement unit (2C) onto the bidirectional data bus (6), and the master unit (3) reads it and averages it. Perform processing and display.

Since all of the above three operations use the bidirectional data bus (6), there is no interruption to the measurement data processing and output operations that are being performed via each unit. In addition, since all operations using the bidirectional data bus (6) are related to the master unit (3), there is no need for parallel processing, and the master unit (3) manages the bidirectional data bus (6). It is sufficient to use time-sharing.

An embodiment of the present invention according to claim 3, as described above, provides a unidirectional data bus (8A
) to (8C), measurement data can be transmitted between adjacent units simultaneously, and measurement data can be transferred to multiple units 3.
The processing time can be shortened when processing is performed through the network.

In addition, commands input from the outside, master unit (3
) Bidirectional data bus (6) for transmitting setting commands, etc.
Since these are provided separately, the processing of measurement data is not interrupted when transmitting these commands.

Furthermore, since a unidirectional data bus dedicated to adjacent units is provided, there is an advantage that processing for measured data can be easily added by rearranging the units and inserting an arithmetic unit that performs arithmetic processing in the middle. Examples of such rearrangement of units are shown in FIGS. 5(a) to 5(d).

In addition to the units described in each of the above embodiments, there is also an I! unit that inputs position measurement values and outputs them as isolated signals via a photocoupler or the like, or manually inputs operation control digital signals using isolated signals. Insulated input/output crab knits, etc., which have the function of bidirectional data bus (6) and unidirectional data bus (8A) to
A connector etc. can be removably connected to the l.

Incidentally, in the above description, the case where the present invention is used in a position measuring device using optical triangulation method has been described, but it goes without saying that it can also be used in a position measuring device using other methods, such as an ultrasonic type position measuring method.

[Effects of the Invention] As described above, the present invention according to the first claim includes a master unit that is detachably connected to a data bus and has various parameters of all units, and a master unit that is detachably connected to the data bus, a measurement unit that is connected to the detection head section and calculates a position measurement value representing the position of the object to be measured based on the parameters; and a measurement unit that is detachably connected to the data bus and performs predetermined processing based on the parameters for the position measurement. a functional unit that performs operations on values;
As explained above, the claimed invention includes a master unit which is detachably connected to a data bus and can store various parameters of all units, and a master unit which is detachably connected to the data bus and has a detection head section. A measurement unit 7 that is connected to the unit and calculates a position measurement value representing the position of the object to be measured based on its own parameters; and a fi function unit that performs predetermined force processing on the position measurement value based on its own parameters. As explained above, the present invention, which is distinguished by a third claim, comprises: a master unit that is detachably connected to a bidirectional data bus and has various parameters of all units; a unidirectional data bus; a measurement unit that is detachably connected to the direction data bus and is connected to the detection head section and calculates a position measurement value representing the position of the object to be measured based on the parameters; Since it is provided with a functional unit that is detachably connected and performs predetermined processing on the position measurement value based on the parameters, it is possible to keep the price and size down and to selectively use the necessary functions. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the invention according to the first claim, FIG. 2 is a block diagram showing an embodiment of the invention according to the second claim, and FIG. 3 is a block diagram showing an embodiment of the invention according to the second claim. FIG. 4 is a block diagram showing an embodiment of the invention according to claim 3, and FIG. FIG. 6 is a block diagram showing another embodiment of the present invention according to the present invention, and FIG. 6 is a block diagram showing a conventional position measuring device. In the figure, (1) ... detection head section, (2A), (2B), (2C) ... measurement unit, (3), (3A) ... master unit, (4)
, (4A) ... Analog output crab unit, (5)
, (5A), (5B) ... Digital input/output crab unit, (6) ... Bidirectional data bus, (7) ... Arithmetic unit, (8A), (8Bm (8C) ... Unidirectional data bus , In addition, is shown. It is a base. In each figure, the same reference numerals are the same,

Claims (3)

[Claims] (1) A master unit that has various parameters for all units, a measurement unit that is connected to the detection head section and calculates a position measurement value representing the position of the object to be measured based on the parameters, and a predetermined process that is performed based on the parameters. A position measuring device comprising a functional unit for performing the measurement on the position measurement value, and each of the units being detachably connected to a data bus. (2) A master unit that can store various parameters of all units, a measurement unit that is connected to the detection head and calculates the position measurement value representing the position of the object to be measured based on its own parameters, and A position measuring device comprising: a functional unit that performs predetermined processing on the position measurement value; each of the units being detachably connected to a data bus. (3) A master unit that has various parameters for all units, a measurement unit that is connected to the detection head section and calculates a position measurement value representing the position of the object to be measured based on the parameters, and a measurement unit that performs predetermined processing based on the parameters. a functional unit for performing the position measurement, all of the units are removably connected to a bidirectional data bus, and adjacent units other than the master unit are removably connected to a unidirectional data bus; Characteristic position measuring device.