JPH0213143A - Optical data transmission equipment - Google Patents

Abstract

PURPOSE:To minimize the power consumption of a light emitting section in a transmission section as required by outgoing a data request signal from a reception section at all times and allowing the transmission section to originate a data signal only when the transmission section enters a transmission enable range and is able to receive the data request signal. CONSTITUTION:In the case of applying data transmission by light between the transmission section 10 mounted on a movable member R and the reception section 20 installed stationarily, while the reception section 20 originates a data request signal to the transmission section 10 for a short period, the transmission section 10 originates a data signal to the reception section 20 in response to the reception of the data request signal. Thus, only when the transmission section 10 resides in the transmission enable range and the data signal reaches effectively the reception section 20, the transmission section 10 can originate the data signal, then the power consumption of the transmission section 10 is minimized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an optical data transmission device, particularly an optical telemeter device suitable for reading measurement data in a movable member such as a rotating member via light. The present invention relates to a data transmission device.

BACKGROUND OF THE INVENTION When reading measurement data in a movable member, such as a rotating member, it is convenient to use a so-called telemeter device. For example, when measuring temperature data in a rotating member, a temperature sensor and a transmitter that can appropriately process the output signal from the temperature sensor and transmit it as a data signal are installed inside the rotating member. On the other hand, by fixedly installing the receiving section and receiving data signals from the transmitting section, predetermined temperature data can be read.

Light or radio waves are usually used as the data transmission medium when constructing such data transmission systems, and while the former is generally superior in that it is less affected by external noise, the transmission Since data transmission between the receiver and receiver is possible regardless of their relative positions, the data transmission range (hereinafter simply referred to as the transmission range) can be widened. Well, the latter is better.

Therefore, in conventional optical data transmission equipment, the transmitting section repeatedly transmits data signals (on the other hand, the receiving section transmits data signals that reach the receiving section when the transmitting section enters the transmission range). It is common to receive and read this only at certain times.

Problem to be Solved by the Invention The problem to be solved by the invention is that when using such conventional technology, the transmitting section repeatedly transmits data signals regardless of whether or not it is within the transmission range, so the power consumption in the transmitting section is reduced. There was a problem that there was waste. That is, when such a telemeter device must be used, the transmitter must be operated from an independent power source, such as a dedicated battery, since commercial power is usually not available in the movable member in which the transmitter is installed. The light emitting part for transmitting the data signal is the part that consumes the most power, so even outside the transmission range where it is not guaranteed that the data signal will reach the receiving part, the data signal cannot be transmitted. Repeated transmissions can unduly drain the battery and, in turn,
This is a serious drawback in that stable operation of the entire system cannot be ensured.

Also, if the transmitter detects that it is within the transmission range and transmits the data signal only at that time,
Since a detection device for detecting the relative positions of the transmitting section and the receiving section must be provided separately, the problem that the overall configuration becomes significantly complicated is unavoidable.

SUMMARY OF THE INVENTION In view of the problems of the prior art, it is an object of the present invention to transmit a data request signal from the receiving section at all times, and when the transmitting section enters the transmission range and is able to receive this data request signal. By transmitting the data signal only when the data signal is transmitted, the light emitting section in the transmitting section only needs to operate when the data signal is transmitted in this way (therefore, power consumption can be minimized). It is an object of the present invention to provide a new optical data transmission device that can perform the following operations and does not require any detection device for detecting the relative positions of a transmitting section and a receiving section.

Means for Solving the Problems The configuration of the present invention for achieving the object is to provide a transmitting section and a receiving section each having a light emitting section and a light receiving section, the former being mounted on a movable member and the latter being mounted on a movable member. Fixed and installed,
When the transmitting section enters the transmission range, the light emitting section of the receiving section transmits a data request signal at a cycle shorter than the transmission time of the transmitting section, when data is transmitted between the two via light. The light receiving section of the receiving section receives the data signal from the transmitting section, while the light receiving section of the transmitting section
The gist is that the data request signal is received from the receiver, and the light emitting section of the transmitter emits the data signal in response to the reception of the data request signal.

Note that the light emitting section and the light receiving section in the transmitting section and the receiving section can be configured as one unit, respectively, and the light emitting section of the transmitting section can be connected to the power source only when transmitting a data signal. can do.

Further, the transmitter may transmit the data signal only once within the transmission range.

With this configuration, when the transmitting section mounted on the movable member enters the transmission range, the light receiving section of the transmitting section first receives the data request signal constantly transmitted from the receiving section. do. Therefore, the light emitting section of the transmitting section transmits a data signal in response to this, but at this time, the fact that the data request signal from the receiving section is received by the transmitting section means that the data signal from the transmitting section also This means that the data signal transmitted in this way can reliably reach the receiving section and be received by the receiving section. As long as there is a margin, the information can be effectively received and read by the receiver.

If the light emitting parts and light receiving parts of the transmitting part and the receiving part are integrated, there will be no phase delay due to the difference in the position of the light emitting part and the light receiving part, so that the reception of the data request signal and the data signal can be easily performed. There is no need to interpose any special time element between the transmission and the transmission, so the overall configuration can be simplified and at the same time the reliability of operation can be increased.

By connecting the light emitting section of the transmitting section to a power source only when transmitting a data signal, it is possible to more reliably eliminate unnecessary power consumption.

Furthermore, if the transmission of the data signal from the transmitter is limited to one time within the transmission range, the transmitted data signal will be There is no risk of the signal being invalidated (therefore, it is possible to eliminate the opportunity to transmit data signals in vain).

It works as described above.

Example Examples will be described below with reference to the drawings.

The optical data transmission device is made up of a combination of a transmitting section 10 and a receiving section 20 (FIG. 1).

The transmitter 10 is mounted together with the sensor S on, for example, a rotating disc-shaped movable member R (FIG. 2). It is assumed that they are fixedly installed in positions where they can face each other over time during rotation.

The transmitting section 10 includes a control section 11 that inputs the output signal Sa of the sensor S, a light emitting section 13, and a light receiving section 14 (Fig. 1), and the light emitting section 13 and the light receiving section 14 are integrated. It shall be configured as follows. The control section 11, the light emitting section 13, and the light receiving section 14 are connected via the modem 12, while the entire transmitting section 10 including the control section 11 is connected to the battery 15.
Power is supplied from. However, the light emitting unit 13 is
The controller 11 is connected to the battery 15 via an open/close switch 16 controlled by the controller 1.
A display section 17 is connected.

The receiving section 20 includes a control section 21, a light receiving section 22, and a light emitting section 2.
3. That is, the light receiving section 22 and the light emitting section 23
is connected to a control section 23, and a display section 24 is connected to the control section 21. Further, it is assumed that the light receiving section 22 and the light emitting section 23 are integrally configured.

The sensor S is, for example, a temperature sensor, and the rotating member R
It is assumed that the temperature at a predetermined location inside is detected and an output signal Sa is output. The control unit 11 of the transmitting unit 10 appropriately processes the content of the output signal Sa obtained in this way, and
Since the data is output to the modem 12, the modem 12 uses this data to create a pulse modulation signal 12a and send it to the light emitting unit 13.
can be output to. However, the pulse modulation signal 12
a, for example, a start code D1, an appropriate control code D2, and a data 9 code D between its start point and end point.
3. This is a pulse signal in which a data end code D4 and an end code D5 are serially connected in chronological order (FIG. 3). Therefore, the light emitting unit 13 can transmit and output an optical signal consisting of a pulse train having the same shape as this pulse modulation signal 12a, as the data signal SL1. Note that the data signal SLI from the light emitting unit 13 may be either visible light or infrared light.

In the receiving section 20, the control section 21 generates a pulse signal 21-a consisting of a series of periodically repeated short pulses using the built-in clock, and outputs this to the light emitting section 23. Assume that an optical signal having the same shape as this is transmitted as the data request signal SL2 (FIG. 4).

Now, when the rotating member R rotates, the transmitting section 10 passes through a position A opposite to the receiving section 20 for each rotation of the rotating member R (FIG. 2). Therefore, when the transmitter 10 is within the range of central angle ±θ with position A as the center, the transmitter 10
The data signal SL1 from the light emitting unit 13 of 0 is sent to the receiving unit 20.
can enter the light receiving section 22 of the light receiving section 22, and at the same time,
Since the data request signal SL2 from the light emitting unit 23 of No. 0 can enter the light receiving unit 14 of the transmitting unit 10, this range is defined as a transmittable range B.

Next, the transmitter 10 transmits a signal from outside the transmission range B.
Considering that the data request signal 9SL2 is always transmitted from the light emitting section 23 of the receiving section 20 (Fig. 4), the light receiving section 14 of the transmitting section 10 is The first pulse P1 after 10 has entered the transmittable range B is first input. Therefore, the control section 11 of the transmitting section 10 transmits the data signal SLI from the light emitting section 13 via the light receiving section 14 and the modem 12 in response to the pulse P1 detected in this way. Since the data signal SLI reliably reaches the light receiving section 22 of the receiving section 20, the control section 21 of the receiving section 20 can read it and display it on the display section 24. However, at this time, it is assumed that the duration 'Fd of the data signal SLI has sufficient margin for the time Tb required for the transmitter 10 to pass through the transmission range B (hereinafter referred to as transmission range passing time). In order to achieve this, the period Te of the data request signal SL2 is preferably selected to satisfy Te<Tb.

The operation contents of the transmitter 10, including the above-mentioned general operations, can be represented by the flowchart shown in FIG.

That is, the control unit 11 of the transmitting unit 10 first checks the output voltage of the batteries 1-5 and determines whether the battery 15 is defective at program step (1) in the figure (hereinafter simply referred to as (1)). If so, the information is displayed on the display unit 17 (2) and stored in a memory (not shown).

When the battery 15 is normal (1), wait for the data request signal SL2 from the receiving unit 20 to be received (3)
, when the first pulse P1 is detected, in response to this, the on/off switch 16 is controlled to connect the battery 15 to the light emitting section 13 (4), and the data signal SLI is transmitted (5).

Note that at this time, if it is stored that the battery 15 is defective, instead of the data from the sensor S, it is also possible to transmit the fact that the battery 15 is defective as a data signal SLI. .

Next, the on/off switch 16 is used to disconnect the battery 15 from the light emitting unit 13 (6), read the output signal Sa from the sensor S in preparation for the next data transmission, and use the result to perform necessary data processing. After doing this (7), wait.

By repeating the above operations, measurement data by the sensor S can be reliably transmitted to the receiving section 20 every rotation of the rotating member R.

In addition, when the rotational speed of the movable member R becomes very slow and the second pulse P2 is detected after the transmission of the data signal SLI is completed, within a single transmission range B, A case may occur in which the data signal SLI is transmitted two or more times (FIG. 6). In such a case, the rear part of the data signal SLI transmitted last does not effectively reach the receiving section 20. In this case, in some cases,
It is preferable to take some measures. For example, the receiving section 20 may be provided with a function to determine the validity of the data signal SLI, and the data signal SLI may be treated as invalid when the end code D5 is not obtained.
, a one-rotation detection mechanism of the movable member R is provided, and within a single transmission range B, the data signal SLI is
It is possible to transmit only once, or to use these in combination.

In the above description, instead of the battery 15, the transmitter 10 may be supplied with power from a power source consisting of any other power generation mechanism. For example, if an electromagnet or a permanent magnet is disposed near the movable member R, and a coil is buried in the movable member R, and the coil cuts the magnetic field as the movable member R rotates, Since voltage can be induced, it is possible to cover the power consumption of the transmitter 10 by using this as a power source. However, in this case, it goes without saying that in addition to a suitable rectifying and smoothing circuit, a power storage element such as a capacitor or battery may be interposed between the coil and the transmitter 10.

Furthermore, it is also possible to arrange a photovoltaic cell on the surface of the movable member R, and to perform the power generation function in the movable member R using light from the outside.

In this way, when the power generation mechanism is built into the movable member R, the on/off switch 16 may be omitted if the power generation capacity can be made sufficiently large; When the power consumption exceeds its power generation capacity, the on/off switch 16 remains active. That is, when the light emitting unit 13 completes its operation, it is disconnected from the power source and the power from the power generation mechanism is
This is because while the power is used to charge the power storage element, when the light emitting section 13 is operated, the power stored in the power storage element can be discharged and used.

As described in detail, according to the present invention, when optical data transmission is performed between a transmitting unit mounted on a movable member and a fixedly installed receiving unit, the transmitting unit is transmitted from the receiving unit to the transmitting unit. , the transmitter transmits a data request signal at short intervals, and the transmitter transmits a data signal to the receiver in response to the reception of the data request signal. Since the data signal can be transmitted only when the data signal effectively reaches the receiving section within the transmission range, the power consumption in the transmitting section can be minimized. Since it is possible to reliably determine that the data request signal has been received by the transmitter when the data has entered the transmission range, a special detection device is required to detect the relative position of the transmitter and the receiver. It has an excellent effect in that it does not require anything.

[Brief explanation of the drawing]

1 to 6 show an embodiment, FIG. 1 is an overall electrical system diagram, FIG. 2 is a usage state diagram, FIG. 3 is a data signal configuration diagram, and FIG. 4 is an operating signal waveform diagram. FIG. 5 is a program flowchart, and FIG. 6 is an operating signal waveform diagram during abnormal operation. R...Movable member B...Transmittable range'b...Transmittable range passage time Te...Period SLI...Data signal SL2...Data request signal 10...Transmission section 20. ...Receiving section 13.23... Light emitting section 14.22... Light receiving section

Claims (1)

[Claims] 1) A transmitting section mounted on a movable member and a receiving section fixedly installed, and when the transmitting section enters a transmission range due to movement of the movable member, transmits light. In the optical data transmission device, the receiving section includes a light emitting section that transmits a data request signal at a cycle shorter than a transmission range transit time of the transmitting section. and a light receiving section that receives the data signal from the transmitting section, and the transmitting section includes a light receiving section that receives the data request signal and a light emitting section that transmits the data signal, and the transmitting section includes a light receiving section that receives the data request signal, and a light emitting section that transmits the data signal, An optical data transmission device characterized in that the data signal is transmitted in response to reception of a signal. 2) The optical data transmission device according to claim 1, wherein the light emitting section and the light receiving section are integrally configured for each of the transmitting section and the receiving section. 3) The optical data transmission device according to claim 1 or 2, wherein the light emitting section of the transmitting section is connected to a power source only when transmitting the data signal. 4) The optical data transmission device according to any one of claims 1 to 3, wherein the transmitter transmits the data signal only once within the transmission range.