JPH0657055B2 - Power system and accessory unit - Google Patents

Description

The present invention relates to an accessory unit that can be attached to and detached from a power supply device, and a power supply system.

[Prior art]

In the related art, for example, there is a camera in which a power source is provided and a diaphragm or the like built in a lens unit is driven. However, when the lens unit is detachably attached to the camera in such a system, the timing of power supply to the lens unit becomes important.

In particular, when a microcomputer (hereinafter abbreviated as "microcomputer") is built in the lens unit and the camera respectively, a channel for transmitting various signals is required between the lens unit and the camera, so that the power line and these Be careful of contact with the channel.

[Problems to be solved by the invention]

In the above case, if the lens unit is replaced while power is being supplied to the lens unit, power may still be supplied to the power line even though communication between the microcomputers has not ended. , In this case, there was a defect that the microcomputer was destroyed.

In order to prevent this, it is conceivable to provide a switch for detecting this when the lens unit and the camera are attached, and to turn on / off the power supply line with this switch (for example, Japanese Patent Laid-Open No. 58-83824). By doing so, there is a drawback in that power is supplied to the lens unit just by mounting the lens unit, and the power source in the camera body is wasted.

The present invention has an object to solve the above-mentioned drawbacks of the prior art, and enables effective control of power supply timing between a general power supply device and another device detachable therefrom. It is an object of the present invention to provide a detachable accessory unit and a power supply system for the power supply device.

[Means for solving problems]

<Means for Solving Problems> The power supply system of the present application is a switch (corresponding to SSW in this embodiment) whose state is switched according to attachment / detachment of the accessory unit in order to detect attachment / detachment of the accessory unit. ,
Communication means for performing two-way communication with the accessory unit after the attachment of the accessory unit is detected by the switch (also C for executing steps # 5 to # 9 in FIG. 6).
2) Substantially supplying power to the drive system of the accessory unit when both the mounting detection output by the switch and the output indicating that the predetermined bidirectional communication is performed by the communication unit are obtained. And a power supply unit having a power supply unit (also a power supply circuit in FIG. 5) that stops the power supply in response to the output of the insertion / removal detection by the switch regardless of the bidirectional communication by the communication unit, and the mounting of the power supply unit. A member for switching the state of the switch at the time of (the same as the part 16), a receiving means for receiving power from the power supply device (also the T
21), a drive system for converting the electric power supplied by the receiving means into mechanical energy (also drive systems L4, L5,
L6), and an accessory unit having a microcomputer (also L1) for performing bidirectional communication with the communication means.

The present invention also provides a switch whose state is switched according to attachment / detachment of the accessory unit to detect attachment / detachment of the accessory unit, and bidirectional with the accessory unit after the attachment of the accessory unit is detected by the switch. Substantially with respect to the drive system of the accessory unit when both communication means for performing communication, output for detection of mounting by the switch, and output for indicating predetermined bidirectional communication by the communication means are obtained. An accessory unit attachable to and detachable from a power supply device that supplies power and has power supply means for stopping the power supply in response to an insertion / removal detection output by the switch regardless of bidirectional communication by the communication means. A member for switching the state of the switch at the time of mounting, a receiving means for receiving power from the power supply device, the receiving means Characterized in that it has a more powered power a drive system for converting the mechanical energy, and a microcomputer for performing said communication means and two-way communication.

<Embodiment> FIG. 2 is a diagram showing a configuration example of an electronic camera body 100 as an example of a power supply device of the present invention. C1 is a main microcomputer, C2 is a main interface, C21 and C25 are power output terminals, and C22 and C26 are DATA terminals, C23 and C27 are BUSY terminals, and C24 and C28 are GND terminals. C
3 is a ROM, C4 is a power supply unit, C5 is a disk drive unit, C6 is a photometry system, C7 is a distance measurement system, and SSW1 and SSW2.
Is a safety switch as a detection means. 200 is the first
The lens unit as the device is detachable from the electronic camera 100. L1 is a sub-microcomputer, L2
Is the lens side interface, L21 is the power supply terminal, L2
2 is DATA terminal, L23 is BUSY terminal, L24 is G
An ND terminal, L3 is a ROM, L4 is a diaphragm drive system, L5 is a focus drive system, and L6 is a zoom drive system.

Also, 300 is a strobe unit as the first device, S1 is a sub-microcomputer, S2 is a strobe side interface, S21 is a power supply terminal, S22 is a DATA terminal, S23 is a BUSY terminal, S24 is a GND terminal, and S3 is S3.
Is a ROM, and S4 is a flash light emitting unit.

Hereinafter, an example using a lens unit as the first device will be described in order to explain the basic coupling between the power supply device and the first device.

It should be noted that the present invention includes not only the camera body as a power supply device but also all general electronic equipment including a power supply. Further, the first device also includes all auxiliary electronic devices that can be attached to and detached from the electronic device.

Further, the detecting means is not limited to the mechanical switch, and may be any type such as an optical switch and a magnetic sensor.

Next, FIG. 3 is a diagram showing a configuration example of a main part of the main interface circuit C2 of the power supply device of the present invention. Q1 and Q2 are switching transistors. Transistor Q1 is power supply C
4 is provided in the power feeding path from the lens side power supply terminal C21. The SSW is a safety switch, which is turned on when the lens unit as the first device is completely attached to the camera body.

FIG. 4 is a diagram for explaining this state, which is used for the lens unit 200.
For example, a screw 19 'is cut at the end of the
The lens unit 200 can be attached to the camera body 100 by screwing 9'into the screw 19 on the camera body side.

When the screws 19 'and 19 are screwed together, the end surface 18' of the lens unit 200 and the corresponding end surface 18 of the camera body are
And are pressed.

At this time, the terminals L21 to L21 of the lens side interface L2
The terminals T'21 to T'24 respectively connected to the L24 and the terminals T21 to T24 respectively connected to the terminals C21 to C24 of the main interface C2 come into contact with each other, whereby C21 to C24 and L21 to L24 are contacted. Is connected.

At this time, the elastic convex portion 16 provided on the lens unit falls into the concave portion 17 provided on the camera body and the switch SSW.
Turn 1 on.

Well connexion back to Figure 3, switch SSW1 resistance than turned ON constant voltage _{V CC} R1, current flows through the diode 14, the anode of the diode becomes low.

This low level is inverted by the inverter 15 and input to the main microcomputer C1.

In response to this input, the main microcomputer C1 starts its operation according to a program to be described later.

When the main microcomputer C1 outputs a predetermined output signal, the switch 13 is turned on. In this way, the switch 13 is turned on only when both the safety switch SSW is turned on and the predetermined output of the main microcomputer is obtained.

When the switch 13 is turned on, the transistor Q2 is turned on. When the transistor Q2 is turned on, a current flows through the resistor R2 connected between the emitter and base of Q1 and Q1 becomes O.
N

This allows the power supply from the power supply C4 in the camera to the lens unit.

FIG. 5 is a diagram showing the details of the above-mentioned third circuit shown in FIG.
Reference numeral 5 is a transistor, and D1 to D3 are diodes. S
When SW is ON, no current flows in D2, so the transistor Q5 is OFF.

At this time, when the switch 13 is turned on by the signal from the main microcomputer C1, Q2 is turned on, and this current flows to the base of Q3 to turn on Q3. Q4 is for stabilizing the operation of Q3. When Q3 is turned on, Q1 is turned on and power is supplied from the power source C4 in the camera to the lens unit.

On the other hand, when the switch SSW is OFF, a current flows through D2 and Q5 is turned ON. At this time, Q1 is OFF regardless of whether the switch 13 is ON or OFF.

Next, FIG. 6 is a flow chart showing the operation of the main microcomputer C1. First, in step # 1, the main microcomputer C1
Supply power to.

Then, it is determined in step # 2 whether the SSW is ON.
This is done depending on whether the output of the inverter 15 is high or low. When SSW is OFF, the switch 13 is turned off and Q1 is turned off. (Step # 3) As a result, power is not supplied to the lens unit. If the SSW is turned on, the switch 13 is turned on for the time being at step # 4. As a result, Q1 is turned on and power is supplied to the lens unit.

After that, the DATA line is set to low level (set to Break) in step # 5. In addition, this state is, for example, 1 msec
Hold about. As a result, the sub-microcomputer L1 is automatically reset. At step # 6, DATA is set to high again to start initialization on the lens side, and wait at # 6 for a sufficient time to complete this initialization. Then, the procedure goes to step # 7 to clear the check count.
(# 17) Next, at step # 18, the main interface BUS
Set Y to high level. If the sub-microcomputer L1 of the lens unit is in the receiving state, the BUSY line becomes low level.

Therefore, in step # 19, it is determined whether or not the BUSY line is at the high level, and if it is at the high level, the check count is incremented by 1 (step # 22). In this case, the check count starts from zero, so "1"
Becomes Next, in step # 23, it is judged whether or not the count value is smaller than 3, and if it is smaller than 3, step # 18
Check the BUSY line again. In this way, even if the steps # 18, # 19, # 22, and # 23 are repeated twice, if the BUSY line is still at the high level, the process moves from the step # 23 to the step # 10 and the switch 1
Turn off 3. Then, in step # 11, it is determined whether or not the power source of the main microcomputer C1 is off,
When turned off, the program ends. As described above, in this embodiment, the check operation is performed a plurality of times in order to check whether or not the state of the sub-microcomputer is an abnormal state such that DATA from the main microcomputer cannot be received. So that it can be prevented.

Therefore, the yield of the main and sub microcomputers can be increased.

When the BUSY line on the sub-microcomputer side can be received at step # 19, that is, when BUSY is at the low level, the process proceeds to step # 20, and this time the DATA on the camera side is received.
Set the line to low level.

In the present embodiment, when a predetermined time data is sent from the main microcomputer, the BUSY line on the sub-microcomputer side should be at high level in a normal state. Then step # 21
It is determined whether the BUSY line on the lens side is high or not, and if it is low, the check count is again increased by steps # 22 and # 23. As described above, when the check of # 18 to # 23 is repeated up to three times, the process proceeds to steps # 10 and # 11.

If it is determined in step # 21 that BUSY on the lens unit side is high, it is considered that the BUSY line is not broken, so that the process proceeds to step # 8.

In step # 8, the lens unit is set to "TEST
Send the command "ID". Since the ID code on the lens unit side is transmitted by this command as will be described later, the ID code is checked at step # 9.
If the ID code is not proper, the power of the sub-microcomputer is turned off in step # 10.

If the ID code is proper, the process proceeds to step # 12 to check whether the main microcomputer is ON. If the main microcomputer is not on, a command is sent to open the diaphragm of the lens unit in step # 15. After that, the process proceeds to step # 16, the switch 13 is turned off, and the power supply to the lens side is cut off.

If it is determined in step # 12 that the main microcomputer is powered on, the process proceeds to step # 13 to send various commands as described later. As a result, the state of each part in the lens unit is controlled by step # 14. The steps # 13 and # 14 are continued until the main microcomputer is turned off.

Next, FIG. 7 is a flow chart showing the operation on the lens unit side. When DATA goes high at step # 6 in FIG. 6, R in the sub-microcomputer is set at step # 24.
Clear AM. Also, each port of the lens side interface is set so that the DATA terminal is at the high level and the BUSY terminal is at the low level.

Then, in step # 25, the diaphragm is initialized as described later so that a predetermined open diaphragm state is obtained. As a result, when the diaphragm is opened, the open switch OSW (not shown) is turned on.

Then, in step # 26, it is determined whether or not the command is sent from the camera body.
Go to and send the command to the command interpreter. In the command interpreter, in step # 28, it is determined whether or not this command is among those stored in the ROML3. If there is, this command is sent back to the camera body side (# 29).

At the same time, at step # 30, the routine jumps to the routine corresponding to the above command, this routine is executed at step # 31, and then the command waiting state is returned at step # 26. If the command is not stored in the ROML3 at step # 28, a command error signal is sent to the camera body side at step # 32, and the command waiting state is returned at step # 26.

Next, FIG. 8 is a diagram showing the details of step # 31 on the lens side in response to the command "TEST ID" for testing the ID in step # 8 in FIG. 6, which is entered from step # 30 in FIG. 7 and then in step # 33. Determine if it is a phase error. This is because the DATA end of the main interface on the camera body side is low, B
If the USY end is high, DATA cannot be sent from the lens side.
This is a step for discriminating the level of each line of Y.

If it is not a phase error, the process proceeds to step # 34 to send the keyword code 1 to the camera body. Here, the keyword code is selected from ASCII character examples, for example, and is set so that the number of repetitions of 0 and 1 increases. That is, the amount of information is increased. As a result, the self-clocking characteristic can be improved, and an error can be easily detected. As such a code, “0101 0011 0101 0010 0010 1010 0101 1010” is specifically used in this embodiment.

Of these, the first 1 bite “0101 0011” is keyword 1, the next 1 bite “0101 0010” is keyword 2, the next 1 bite “0010 1010” is keyword 3, and the next 1 bite “0101 1010” is keyword 4
And

As described above, at step # 34, the keyword code 1 is transmitted to the camera side, then at step # 35, it is determined whether or not there is a phase error, and if not, the keyword code 2 is sent at step # 36. Thereafter, in step # 37, a phase error is detected, and if there is no error, the keyword code 3 is sent in step # 38. In step # 39, the phase error is detected, and if there is no error, the keyword code 4 is sent in step # 40. After that, a phase error is detected in step # 41, and if there is no error, the manufacturer / type code is sent in step # 42. Each maker / type code consists of 4 bits, and the maker code consists of a combination of 0.1 of 4 bits. The type code has the structure shown in the following table.

After that, a phase error is detected in step # 43, and if there is no error, a serial number code is sent (step # 44). The serial number code consists of 1 bite and indicates the serial number of the lens unit. For example, it is used to make a difference between the old product series and the new product series when the product series is switched.

After that, a phase error is detected at step # 45, and if not, a 1-bit function code is sent at # 46.

The function code is constructed so that each bit has its own characteristics of the lens unit. For example, the lowest bit is A
The presence or absence of F, and the following bit are configured to indicate the presence or absence of macroposition. Of course, the rest of the bits can contain various other information as well.

Steps # 33, # 35, # 3 for detecting each phase error
When an error is detected at 7, # 39, # 41, # 43, # 45, or when the transmission of the function code is completed at step # 46, the command wait routine is moved to at step # 47.

Therefore, the determination is made in step # 26 in FIG. 7 until the next command comes.

In the above embodiment, the power supply to the lens unit is stopped when the ID code of the lens unit as the first device is not proper or the predetermined condition with the camera body is not satisfied. Since it is set, unnecessary power consumption can be prevented.

Further, in this embodiment, the abnormality of the lens unit is detected by discriminating the states of the DATA line and the BUSY line of the lens unit as the first device. In addition, since the power supply to the lens unit is cut off in that case, it is possible to prevent electric leakage.

Further, in this embodiment, all the necessary information can be read from the lens unit by sending one command from the camera unit in order to discriminate the ID code or the like of the lens unit. The time required to send and receive signals can be greatly reduced. Further, more information can be transmitted and received within a limited time.

Therefore, it becomes possible to finely control the state of an external device such as a lens unit at high speed.

Further, in this embodiment, a common keyword code is provided for each interchangeable lens unit, and this code is read by the first command from the camera body side, so that the ID information can be read most efficiently.

Also, the keyword code is divided into multiple units (eg bite), and each time the code of each unit is sent to the camera body, if it is confirmed that there is no phase error with the camera, the code is sent again from the beginning. So there is no misidentification of the code.

Also, for other ID codes and the like, the phase error is similarly detected for each unit, so that the same effect can be obtained.

<Effects of the Invention> According to the present invention, when the accessory unit is not attached to the power supply device, or the unit which should not be originally attached,
For example, even if an accessory unit that seems to have failed is installed, it is possible to prevent an excessive current from flowing accidentally, and even remove the accessory unit from the power supply during communication with the accessory unit. Even in such a case, the power supply is stopped according to the loading / unloading detection output by the switch. Therefore, even in such a case, it is possible to prevent an erroneous excessive current from flowing and to enable safe and efficient power supply. It is possible to provide a power supply system and an accessory unit that operate.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of the present invention, FIG. 2 is a configuration diagram of a power supply device, FIG. 3 is a configuration diagram of main parts of a main interface circuit, and FIG. 4 is a supply relation between a lens unit and a camera body. Fig. 5, Fig. 5 is a diagram showing the details of the third illustrated circuit, Fig. 6 is a flow chart showing the operation of the camera body side when the lens unit is attached, and Fig. 7 is a diagram showing the operation when the lens unit is attached to the camera body. Fig. 8 is a flow chart showing the operation on the lens unit side, and Fig. 8 is a flow chart of the transmission operation from the lens unit in response to the command "TEST ID". 1 ... Power supply device, 2 ... 1st device, 3 ... Power supply, 4 ... Detection means, 5 ... Control means, 7 ... Power feeding means.

Claims (2)

[Claims] 1. A switch whose state is switched according to attachment / detachment of the accessory unit to detect attachment / detachment of the accessory unit, and bidirectional with the accessory unit after the attachment of the accessory unit is detected by the switch. A communication means for performing communication, a substantial part for the drive system of the accessory unit when both the mounting detection output by the switch and the output indicating that the predetermined bidirectional communication is performed by the communication means are obtained. A power supply device that has a power supply device that supplies power and that stops the power supply in response to an insertion / removal detection output by the switch regardless of bidirectional communication by the communication device, and a switch of the switch when the power supply device is attached. A member for switching the state, a receiving means for receiving electric power from the power supply device, and a mechanical energy for supplying electric power supplied by the receiving means. Power supply system comprising consisting accessory unit having a microcomputer for performing driving system for converting the over, the communication means and two-way communication. 2. A switch whose state is switched according to attachment / detachment of the accessory unit to detect attachment / detachment of the accessory unit, and bidirectional with the accessory unit after the attachment of the accessory unit is detected by the switch. Substantially with respect to the drive system of the accessory unit when both communication means for performing communication, output for detection of mounting by the switch, and output for indicating predetermined bidirectional communication by the communication means are obtained. An accessory unit attachable to and detachable from a power supply device that supplies power and has power supply means for stopping the power supply in response to an insertion / removal detection output by the switch regardless of bidirectional communication by the communication means. A member for switching the state of the switch at the time of mounting with, a receiving means for receiving power from the power supply device, and a receiving means Ri powered power a drive system for converting the mechanical energy, accessories unit characterized by having a microcomputer for performing said communication means and two-way communication.