JPH0735968A - Controller - Google Patents

Abstract

PURPOSE:To provide a controller capable of preventing the destruction of stored contents caused by power reduction. CONSTITUTION:This controller is provided with an arithmetic controller 6 in which information installed in the arithmetic controller 6 for a controlled object is stored, a controller 21 controlling the rewrite of the information stored by the arithmetic controller 6 or the addition of another information, and a power source circuit 56 provided with a power reduction state detecting means for detecting the output state of a battery 36; and the storing operation of the arithmetic controller 6 and the execution or the non-execution of a control means are controlled by the controller 21 based on the detected result by the power reduction state detecting means of the circuit 56.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device having a function of storing control conditions, information and the like.

[0002]

2. Description of the Related Art In recent years, the improvement of electronics technology has been
It reduces the troublesome operations and processes of the operator (user) on the product and enables the automation of the operation of the product (apparatus). Further, at present, a technology in which a product reads an operator's intention and performs automatic control according to the intention is rapidly developing.

FIG. 16 is a block diagram showing an example of a control device for a video camera.

The control system shown here is one in which the camera reads the intention of the photographer (operator) and performs automatic control according to the intention, and the apparatus observes where the photographer's line of sight looking into the viewfinder is. The automatic focus adjustment control circuit focuses on the subject viewed by the photographer, that is, focuses only on the subject which the photographer is gazing out of the plurality of subjects displayed in the viewfinder.

In FIG. 16, an infrared light generator 1 is provided in the finder unit, and the infrared light is applied to an eyeball 3 of a photographer through an eyepiece lens 2, and the eyeball 3 is irradiated with the infrared light.
The infrared light reflected by is received by the photoelectric conversion element 4. A line-of-sight position analysis device 5 is connected to the photoelectric conversion element 4 and analyzes which subject the photographer is observing.
An arithmetic control device 6 using a microcomputer or the like is connected to the eye gaze position analyzing device 5, and gaze position information of the eye gaze position analyzing device 5 is fetched to calculate eye gaze coordinates.

A character generator 7 is connected to the arithmetic and control unit 6 and is used for displaying the line-of-sight position of the photographer recognized by the camera. Character generator 7
A display drive device 8 is connected to the monitor drive device 8, and its output signal is output to a monitor 9 arranged in front of the eyepiece lens 2.

On the other hand, a focus lens 11, a variable power lens 12, a diaphragm 13 and an image pickup photoelectric conversion element 14 are sequentially arranged in a straight line facing the subject 10. The video signal output from the image-pickup photoelectric conversion element 14 is output to the display drive device 8 and is superimposed on the output of the character generator 7 to display an image on the eyepiece lens 2. The output of the image pickup photoelectric conversion element 14 is input to the AF signal processing circuit 67, the output of the AF signal processing circuit 67 is supplied to the control device 21 described later, and the focus lens 11 is output according to the output of the AF signal processing circuit 67. Move to focus. At this time, if the subject at the line-of-sight position is to be focused, a distance measuring area (not shown) is moved to the line-of-sight position, and the focusing operation is executed based on the image information in the area. An actuator 15 (a mechanism using a motor as a drive source) for moving the focus lens 11 in the optical axis direction is connected to the focus lens 11. Similarly, an actuator 16 is connected to the variable power lens 12. Furthermore, diaphragm 1
3 is an actuator 1 for changing the opening.
7 are connected.

Drivers 18, 19, 20 are connected to the actuators 15, 16, 17, respectively, and these are connected to a control device 21 for controlling the system.
The control device 21 is connected to the arithmetic and control unit 6 so as to exchange information with each other. The pull-up resistor 22 inserted between the control device 21 and the power source is connected,
A switch 26 is connected between the low potential side and ground. Similarly, the arithmetic and control unit 6 is connected to the pull-up resistor 27 inserted between the power supply and the power source, and the switch 28 is connected between the low potential side and the ground. Also,
A power supply circuit 33 is connected to the control device 21 via lines 29, 30, 31, 32.

Lines 29 and 30 are lines for transmitting the power reduction state of the battery 36 to the control device 21, and line 31 is 5 lines.
It is used to control the power supply to the V line, and the line 32 constantly controls the power supply while the battery is installed.
It is a power supply line for supplying electric power to. In addition, the power supply circuit 3
A line 34 for outputting 5V and an unregulated line 35 for directly supplying the battery output to a necessary portion of the video camera are drawn from 3. Further, a battery 36 (a primary battery such as a manganese battery that can be used only once, a secondary battery such as a rechargeable nickel-cadmium battery, etc.) is connected to the power supply circuit 33. Further, a synchronization signal generation circuit 37 is connected to the arithmetic and control unit 6 and the character generator 7, and the synchronization signal generation circuit 3
A drive circuit 38 is connected to the image pickup photoelectric conversion element 1
4 is driving.

FIG. 17 is a circuit diagram showing the detailed structure of the power supply circuit 33.

The power supply circuit 33 converts the voltage of the battery 36 into a power supply voltage (for example, 5 V) of an integrated circuit (IC) provided in the video camera and outputs the power supply voltage, or the power reduction state (terminal of the battery 36). When the power supply stop command is issued from the control device 21 through the line 31, the power supply to the 5V line 34 is performed. It has the function of taking measures such as stopping.

The power supply circuit 33 is a DC-DC converter 3
9, 40, resistors 41 and 42 connected between the output of the DC-DC converter 40 and the ground, resistors 44 and 45 connected between the battery 36 and the ground, a connection point 43 of the resistors 41 and 42, and resistors 44 and 45. Of the connection point 46 of which the input signal is a comparator 47, resistors 48 and 49 connected between the output end of the DC-DC converter 40 and the ground, and resistors 51 and 52 connected between the battery 36 and the ground. , Resistance 4
Each of the comparator 54 which receives the voltage of each of the connection point 50 of 8 and 49 and the connection point 53 of the resistors 51 and 52 as an input signal, and the switch 55 which is connected between the output end of the DC-DC converter 39 and the line 34. Composed of.

The voltage of the battery 36 is converted into a DC voltage of 5 V by the DC-DC converter 40, divided by the resistors 41 and 42 (becomes the reference voltage V ₁ ), and the resistors 48 and 4 are used.
Even in 9, the voltage is divided (the reference voltage becomes V ₂ , but V ₁ > V ₂ is set). Further, the voltage of the battery 36 is divided by the resistors 44 and 45 (voltage V ₃ ) and the voltage of the resistor 5 is reduced.
The voltage is divided by 1,52 (voltage V ₄ ). The reference voltage V ₁ and the voltage V ₃ are compared by the comparator 47, and the reference voltage ₂ and the voltage V ₃ are compared.
₄ is compared by the comparator 54.

When the relationship of V ₁ > V ₃ is established, the comparator 47 sends a signal indicating a low power state (that means that the battery voltage has reached a level requiring battery replacement) to the line 30. Output. Receiving this signal, the control device 21 displays reduced power on the monitor 9 via the arithmetic and control unit 6, the character generator 7 and the display drive unit 8.

The power reduction display referred to here is, for example, as shown in FIG. 18, and "BATT" is displayed in the display screen 1801.
Reduced display 1802 of the display contents such as, a subject image 1803,
Markers 1804 and 1805 for adjusting individual line-of-sight function are displayed. The power reduction display of “BATT” is performed by blinking the power reduction display 1802. When the monitor 9 is used, the photographer closes the switch 26 of FIG. 16 to enter the visual axis function individual difference adjustment mode, and the visual axis function individual difference adjustment marker 180 is set.
4, 1805 is displayed. First, the photographer uses the marker 18
Attention is paid to 04, and the switch 28 is closed. By this operation, the line-of-sight position when the photographer sees the marker 1804 is confirmed, and then the line-of-sight position when the photographer sees the marker 1805 is confirmed.

Line-of-sight function individual difference adjustment markers 1804, 1
The “matching information of the photographer's line of sight and the device recognition” obtained when the photographer views 805 is stored in the storage unit in the arithmetic and control unit 6, and the photographer's line of sight is observed based on this information. .

From the time when the reduced power display is made, the battery 36
Further lowering the voltage of, the relation of V _2> V ₄ occurs, the comparator 54 outputs an output signal (signal indicating a reduced voltage shutoff) to line 29. Based on this, the control device 21 opens the switch 55 to shut off the power supply to each block to forcibly stop the system and prevent the system from malfunctioning or malfunctioning.

When observing the line of sight of the photographer and attempting to control the device corresponding to this line of sight, each photographer has individual differences with respect to the line of sight. Therefore, each photographer himself / herself adjusts according to the individual difference. Must be done.

FIG. 19 is a block diagram showing a detailed configuration of the arithmetic and control unit 6.

The arithmetic and control unit 6 includes a storage unit 6a having arithmetic processing for controlling and a temporary information storage unit, and individual difference information and non-temporary information (a person who intends to adjust a photographer or a camera). The storage unit 6b stores the information stored therein unless it is erased. Storage unit 6b
Is composed of an element such as an EEPROM that cannot be erased / written without special processing, and can be executed by rewriting the contents by using a specific program and a specific instruction in the storage section 6a.

[0021]

However, in the above-mentioned prior art, when the video camera or the like is provided with a function for adjusting individual differences by the photographer, the following problems may occur.

While the battery lasts about 1 to 2 hours per battery (in other words, frequent opportunities for power reduction shutoff), the individual difference adjustment function is always executed. You can do it. On the other hand, when an element that relies on an execution command from external software such as EEPROM is used to store information such as individual difference information, if the instability of the power supplied during storage processing increases, the specified address An unspecified number of data other than the specified data may be written, or the part other than the specified data may be erased. Furthermore, if the shutoff due to power reduction is executed within the finite time required for writing, whether the value is the previous value of the corresponding data or the erased state,
It becomes impossible to judge whether the rewriting is completed or the value is completely incorrect, and the credibility of the stored data itself is lost.

When abnormal data is stored in the storage unit in this way, there is a risk that some programs may become inoperable. In addition, the device does not operate smoothly even if the photographer adjusts according to the procedure.

It is an object of the present invention to provide a control device capable of eliminating the damage of the stored contents or the obstacle of the adjustment performance due to the power reduction as described above.

[0025]

In order to achieve the above object, the present invention has a storage means for storing information on a controlled object and a rewriting of the storage information by the first storage means or addition of another information. In a control device comprising a control unit for controlling the output state of a battery as a power source, a control unit for executing the storage unit and the control unit based on a detection result of the power reduction state detection unit, or A selection means for selecting non-execution is provided.

In order to improve the usability, it is possible to provide a means for making the operator recognize the execution or non-execution by the selection means by a display or the like.

In order not to fall into the power reduction state during adjustment,
The adjustment time is limited, and the power reduction detection threshold value is set so that the power is not reduced within the adjustment time.

The power reduction state detecting means can change the conditions for the detection.

Then, the change of the condition can be performed in response to the completion or suspension of the execution of the storage means or the control means.

[0030]

According to the above-mentioned means, for example, when adjusting the line of sight of the camera, when adjusting the individual difference or writing specific conditions or information desired by the user in the storage medium, the power supply is turned off. The state is detected, and execution or non-execution of the storage operation or the line-of-sight adjustment operation is selected according to the power supply state (whether or not the battery capacity is sufficient). As a result, it is possible to prevent the stored contents from being destroyed due to power reduction.

By means of the selection means, whether or not the line-of-sight adjustment or the like can be performed is displayed to the operator via the monitor, so that the operator can know the current operating condition of the apparatus and improve the operability. You can

Further, when the storage means and the control means are executed, a time limit is set for the execution time, and a power reduction detection threshold value is set so that the power reduction state does not occur within the time.

The power reduction state detecting means can change the conditions for its detection, and further can be performed in response to the completion or suspension of the execution of the storage means or the control means, thereby storing only in a stable power supply state. Since the contents can be rewritten, the stored contents can be prevented from being destroyed.

[0034]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a control device according to the present invention. In addition, in FIG.
Since the same reference numerals are used for the same elements as those shown in, the duplicate description will be omitted below.

As shown in FIG. 1, the overall structure of this embodiment is the same as that of FIG. 16, but the power supply circuit 5 is equipped with reference voltage changing means instead of the power supply circuit 33 of FIG.
6 is provided, and a line 57 is provided between the power supply circuit 56 and the control device 21. A signal for changing the reference voltage of the comparator in the power supply circuit 56 is output from the control device 21 to the line 57.

FIG. 2 is a circuit diagram showing the detailed structure of the power supply circuit 56 according to the present invention. In FIG. 2, the same reference numerals are used for the same elements as those in FIG. 17, and thus duplicated description will be omitted below.

As shown in FIG. 2, the connection point 43 of the voltage dividing circuit.
A switch 58 and a resistor 59 are connected in series between the switch and the output terminal of the DC-DC converter 40, and inserted.
8 is turned on / off by a signal on the line 57. The resistance value of the resistor 59 is a sufficient power during the adjustment of the line-of-sight function based on the time required for the adjustment of the line-of-sight function, the power consumption of the video camera during the adjustment of the line-of-sight function, and the curve of the power reduction amount of the battery 36 over time. Is set to be supplied.

FIG. 3 is a flow chart showing a processing example of the control device 21 in the present invention. In the figure, S means a step.

When the start of the process is instructed, the mode does not shift to the line-of-sight function adjustment mode until the photographer closes the switch 26, so that the standby is continued. When the switch 26 is closed (S301), it is considered that the photographer is about to start adjusting the line-of-sight function, and the control device 21 turns on the switch 58 via the line 57 (S302). When the switch 58 is turned on, the reference voltage V ₁ of the comparator 47 rises as much as the resistor 59 is inserted in parallel with the resistor 41, and the reference voltage V ₁ of the comparator 47 is shown in FIG. As shown in the characteristic diagram), the normal power reduction threshold value A is changed to the threshold value B during adjustment. As a result, the threshold value for power reduction determination is increased. That is, the determination of power reduction can be made earlier.

Comparator 4 with switch 58 closed
If the output state of No. 7 is fetched and the power reduction state is shown (S
303) The power is reduced and displayed (S308), and the photographer is urged to replace the battery and then to adjust the line-of-sight function again. When it is determined in step 303 that the power is not in the reduced power state (the current power reduction threshold value is higher than the power reduction threshold value during normal use and is higher than the current power reduction threshold value). If the battery indicates the value, it is assumed that sufficient power is supplied even during the sight line adjustment), the switch 58 is turned off (S304), and the power reduction threshold value is returned to the normal state. Shift to adjustment mode (S30
5).

In this line-of-sight function adjustment mode, the line-of-sight function individual difference adjustment markers 1804 and 1805 of FIG. 18 are displayed in the viewfinder (S305) to let the photographer recognize that the line-of-sight function adjustment mode has been entered. When the line-of-sight adjustment is completed (S306), the line-of-sight function individual difference adjustment marker 1804.
1805 is erased (S307), and the process ends. If adjustment is not completed in step 306, step 3
Returning to 04, the subsequent processing is repeatedly executed.

FIG. 5 is a flow chart showing the second embodiment of the present invention. Note that in FIG. 5, the same process as that in FIG. 3 is given the same flow number, and therefore, redundant description will be omitted below.

If it is determined in step 303 that the power is in the reduced power state, the reduced power display is blinked on the screen of the monitor 9 (S308) to prompt the photographer to replace the battery, and then the sight line function is adjusted again. Encourage you to do. Then, a display notifying the photographer that the line-of-sight cannot be adjusted is displayed (S50
1), all processing is completed.

FIG. 6 is a flow chart showing the third embodiment of the present invention. Note that, in FIG. 6, the same process as that in FIG. 3 is assigned the same flow number, and therefore, redundant description will be omitted below.

As shown in FIG. 4, the value of the resistor 59 is determined by the amount of power reduction of the battery 36 with respect to the elapsed time and the standard eye-gaze adjustment time. The power reduction curve of the battery 36 and the power consumption of the camera are items that can be grasped at the stage of designing the camera, while the line-of-sight adjustment time has individual differences and cannot be surely grasped at the stage of design. Absent. In each of the above embodiments, once it is determined in step 303 that the power is not reduced, the adjustment is repeated regardless of the power reduction state of the battery 36. That is, it does not take into consideration the individual variation in the adjustment time.

On the other hand, during adjustment, it may be possible to judge whether or not the power is always reduced, and to stop the adjustment when the power is reduced, but this is during writing to the memory element. In this case, writing is inevitable during power reduction.

Therefore, in this embodiment, the time that can be spent for the adjustment is limited, and the resistance value of the resistor 59 is determined in accordance with the time, thereby eliminating the uncertainty in the design and more surely the storage element. Protects the memory contents of.

If it is determined in step 303 that the power is not reduced, it is determined whether the set timer value has reached a predetermined value (S601). If the timer value has not reached the predetermined value, the switch 58 is turned off (S3
04), markers 1804 and 180 for adjusting individual differences in gaze function
5 is displayed on the monitor 9 (S305), and if the line-of-sight adjustment is completed (S306), the timer is reset (S60).
2), and markers 1804 and 1 for adjusting individual differences in the line-of-sight function
The display of 805 is erased (S307). If the line-of-sight adjustment is not completed in step 306, the time count is continued (S603), the process is returned to step 601, and the subsequent processes are repeatedly executed.

On the other hand, if the time count is completed in step 601, the line-of-sight adjustment is stopped (S604), the timer is further reset (S605), and if the switch 26 is off (S606), the process proceeds to step 307. Then, the markers 1804 and 1805 for adjusting the line-of-sight function individual difference are erased.

According to this embodiment, the time for staying in the adjustment mode is limited, so that the value of the resistor 59 can be determined in accordance with this time, and the storage element of the storage element can be more reliably compared with the above embodiments. It becomes possible to protect the stored contents.

FIG. 7 is a block diagram showing a fourth embodiment of the present invention. In FIG. 7, the same elements as those in FIG. 1 are designated by the same reference numerals, and the duplicated description will be omitted below.

This embodiment is characterized in that the components relating to the line-of-sight adjustment are removed, while the control device 21 is provided with a title selection function. The title here is
As shown in FIG. 8, a subject image 802 in the screen 801 is displayed.
Means to store characters 803, etc. by superimposing them on.

Specifically, by closing the switch 26 connected to the control means 21, the voltage of the input terminal 60 becomes low level, and the title selecting function of the control device 21 starts to operate. The switch 61 is used to determine the character and the position of the character to be selected. Switch 61
Resets the voltage of the 5V line supplied through the resistor 62 to 0.
This is done by selecting whether it is a potential or 5V.

When the switch 26 is turned on, the "F" of the first character 804 (FIG. 8) blinks. At this time,
When the rotary shaft of the variable resistor 63 is rotated, the potential of the variable terminal 64 changes according to the rotation, and the display changes in alphabetical order, for example, F → G → H → I → J ... In accordance with the change. Can be made.

With the "F" as it is, the character 803 in FIG.
If it is desired to change the “L” of, by opening and closing the switch 61 once without rotating the rotary shaft of the variable resistor 63 at the blinking “F”, the blinking position moves to the character 803,
“F” is stored in the storage element as it is. When the rotary shaft of the variable resistor 63 is turned at the position of the character 803 to select an appropriate character and the switch 61 is closed once, the selected character is stored in the memory element and blinking moves to the adjacent character. When the character selection is complete, switch 26 can be opened to return to normal operation.

FIG. 9 is a circuit diagram showing the detailed structure of the memory element of the control device 21.

The control device 21 includes a control unit 65 and a storage unit 66.
A storage medium such as an EEPROM is used for the storage unit 66. Since this EEPROM is a memory element that can be erased and written only by a special process, it may cause a serious malfunction if it falls into the power reduction state during the special process. In particular, the control device 21 uses a power supply that is not shut off by the switch 55 of the power supply circuit 56, so that it is easy to operate even with a low power supply voltage. However, unless the control unit 65 and the storage unit 66 have sufficient power supply conditions, malfunction is likely to occur, and in that sense, the storage element is rewritten while monitoring the power supply state. That has important significance.

FIG. 10 is a flow chart showing the processing of the storage element protection program when storing a character title. Note that, in FIG. 10, the same reference numerals are added to the same contents as the processing in each of the above flowcharts.

It is determined whether or not the switch 26 is closed (S301). If the switch is off, it means that the photographer is not trying to change the character title, so the process waits. If the switch is on, the switch 58 is closed (S302), and the threshold value for power reduction evaluation is increased. Then, when the power reduction is determined under the condition that the high threshold value is used (S303), the switch 26 is turned off (S303).
Until the step 1004) is performed (S308), the character title is not selected and stored.

On the other hand, if it is determined in step 303 that the power is not reduced, the title storage mode is set (S1001), and the operation of selecting and storing the character title is executed. When it is determined that the switch 26 is off (S1002), the switch 58 is turned off (S100).
3), all processing ends. Here, step 100
If the switch 26 is turned on in step 2, there is a possibility that the title selection and storage operation may continue, so step 1
The processing is returned to 001 and the subsequent processing is repeatedly executed.

FIG. 11 is a flow chart showing a modification of the processing of FIG.

In this processing example, a step 1101 for displaying a title storage addition is provided between steps 308 and 1004 of the flow of FIG. That is, after the power reduction display is performed in step 308, all the characters 804 shown in FIG. 8 blink, or if there is no character stored as the title, a function of outputting an appropriate character, etc. It is characterized by the provision of.

FIG. 12 is a flow chart showing the fifth embodiment of the present invention. Note that the device configuration that is the target of this processing is shown in FIG. 7, and the same reference numerals are given to the same processing as that used in each of the above flowcharts.

It is determined whether the switch 61 for outputting the character storage command is closed (S1201).
If it is determined that the switch is off, it is not necessary to access the storage element shown in FIG. 9, so that the stored contents will not be destroyed even if the power reduction state occurs. Therefore, it waits until the switch 61 is closed.

When it is determined that the switch 61 is turned on (S1201), the switch 58 is turned on (S30
2) Raise the power reduction evaluation threshold. Then, the voltage of the battery 36 is evaluated with the increased power reduction evaluation threshold value (S30
3) If the power is not reduced, the designated character type is stored in the storage unit 66 (FIG. 9). Whether or not this storage operation is completed is confirmed (S1202), and if not completed, the operation returns to step 1202 to continue the operation.

If writing is completed, switch 5
8 is turned off (S1204), and all the processes are completed.
On the other hand, when the power reduction state is confirmed in step 303, the power reduction display is performed until the switch 61 is turned off (S30
8) If turned off, the switch 58 is turned off (S12
04).

FIG. 13 is a flowchart showing a modification of the embodiment shown in FIG. In FIG. 13, the same reference numerals are used for the same components as those in the flow charts of the above-mentioned respective embodiments, and therefore, duplicated description will be omitted below.

This embodiment is characterized in that a title memory addition display is performed between step 308 and step 1205 of the flowchart of FIG. 12 and step 1101 is provided. The title storage addition display is the same as that described with reference to FIG. 11, and thus the description thereof is omitted here.

FIG. 14 is a flow chart showing the sixth embodiment of the present invention. It should be noted that the same reference numerals are attached to the same processes as those used in each of the above flow charts.

This embodiment supplements the functions of the above-described fourth and fifth embodiments. Here, the case where the function is added to FIG. 10 will be described.

In the fourth and fifth embodiments, step 3
If it is determined that 03 is not the power reduction once, the character input operation is repeated regardless of the power reduction state of the battery 36. In other words, no consideration is given to personal variations in character input required time. On the other hand, it is possible to always judge whether or not the power is reduced during character input, and to stop the character input when the power is reduced.If this is during writing to the memory element, the power is being reduced. There is no choice but to write to.

Therefore, in this embodiment, the time spent for character input is limited and the value of the resistor 59 (FIG. 2) is determined in accordance with the same idea as in the second embodiment. In addition, the uncertainties at the time of design are removed, and the stored contents of the storage element are protected more reliably.

Next, the processing contents of FIG. 14 will be described.

The switch 26 is turned on (S301), and the process waits until the photographer instructs the camera to switch to the character input mode. Switch to character input mode and switch 58
Is turned on (S302), and it is determined whether or not the power is off (S303). If the result of determination is that the power is in the power-reduced state, power-reduction display is performed (S308).

When it is determined in step 303 that the power is not reduced, it is determined whether or not the value of the specially set timer reaches a predetermined value (S601). If the value of the timer has not reached the predetermined value, the switch 58 is turned off (S304), the mode is shifted to the title storage mode (S1001), and characters are input. At this time, the variable resistor 6
Only the characters changed by rotating 3 are made to blink.

Then, it is determined whether the switch 26 is in the off state (S1401), and if the switch is on, the timer is incremented (S603), the process proceeds to step 601, and the subsequent processes are repeatedly executed. If the switch 26 is off, it is considered that the photographer has finished inputting characters and the timer is reset (S140).
2) Further, the blinking display of the title is stopped (S140).
3).

On the other hand, when it is determined in step 601 that the timer count is complete, a message indicating that the character input is canceled (the title input is canceled) due to the time-out (for example, all character titles are blinked for several seconds) is displayed. (S140
5). Next, the timer is reset (S1406), and it is further determined whether the switch 26 is on (S140).
7) If it is off, the process proceeds to step 1403.

As described above, the reason why step 1407 is provided is that the character input operation may be started as it is when the processes after step 301 are performed again even after all the processes are completed. is doing.

By the above processing, the time for which the character input mode is stayed is limited, so that it is possible to determine the value of the resistor 59 in accordance with this time.
Using the concept of the fifth embodiment, the stored contents of the storage element can be protected more reliably.

FIG. 15 is a flow chart showing the seventh embodiment of the present invention. This embodiment corresponds to the modification of FIG. 3, but the idea can be applied in common to each of the above embodiments.

In the process of FIG. 15, the threshold value for power reduction comparison is kept at the power reduction threshold value A of FIG. 4 and is not changed. First, when it is confirmed that the switch 26 is turned on (S30
1) It is determined whether or not the power is off (S30).
3). The power reduction threshold value at this time is a value determined by the resistors 41 and 42 in FIG. 2, and no special threshold value is set even in the adjustment mode. And the battery 36
If is in the reduced power state, the reduced power display is performed (S308), and the line-of-sight adjustment is not performed.

If it is determined in step 303 that the power is not reduced, the mode is shifted to the line-of-sight adjustment mode to execute the line-of-sight adjustment (S305), and if the line-of-sight adjustment is completed (S3).
06), markers 1804 and 180 for adjusting individual differences in gaze function
The display of No. 5 is erased (S307), and all processing is ended.

According to the processing of FIG. 15, it becomes possible to protect the memory element while keeping the hardware structure as it is.

If the control device has a timer, if the opening and closing of the switch 58 is omitted as shown in FIG. 15, the upper limit of the timer count value becomes smaller than the value set in FIGS. 6 and 14. By doing so, the resistance values 41 and 42 for more reliable protection of the memory element can be determined.

[0086]

Since the present invention is configured as described above, it has the following effects.

According to another aspect of the present invention, there is provided a storage means for storing information on an object to be controlled, a control means for rewriting stored information by the first storage means or adding another information, and a battery as a power source. In a control device including a power reduction state detection unit for detecting an output state, a selection unit for selecting execution or non-execution of the storage unit and the control unit based on a detection result of the power reduction state detection unit is provided. Therefore, it is possible to prevent the memory contents from being destroyed due to the power reduction of the power supply.

In the control device according to the second aspect of the present invention, since the means for making the operator recognize the execution or non-execution by the selection means is provided, the operator can know the current operating state of the device, and the operation can be performed. It is possible to improve the sex.

According to another aspect of the control device of the present invention, the selecting means executes the storage means and the control means,
Since the execution time is limited, it is possible to recognize beforehand the battery capacity that does not cause the power to be reduced during operation, and if the power is reduced during operation, prohibit the operation, and The stored contents can be surely protected.

In the control device of the fourth aspect, since the power reduction state detecting means can change the condition for the detection, it is possible to secure a margin until reaching the true power reduction state, and more surely. It is possible to prevent the contents of power reduction from being destroyed.

In the control device of the fifth aspect, the condition for detection in the power reduction state detecting means can be changed according to the completion or suspension of the execution of the storage means or the control means. It is possible to surely prevent the destruction of the electricity content, and it is possible to fully use up the capacity of the battery when the control means is executed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a control device according to the present invention.

FIG. 2 is a circuit diagram showing a detailed configuration of a power supply circuit according to the present invention.

FIG. 3 is a flowchart showing a processing example of a control device in the present invention.

FIG. 4 is a characteristic diagram showing how power is reduced.

FIG. 5 is a flowchart showing a second embodiment of the present invention.

FIG. 6 is a flowchart showing a third embodiment of the present invention.

FIG. 7 is a block diagram showing a fourth embodiment of the present invention.

FIG. 8 is a screen diagram showing an example of a display screen according to the present invention.

FIG. 9 is a block diagram showing details of a control device.

FIG. 10 is a flowchart showing the processing of a storage element protection program when storing a character title.

11 is a flowchart showing a modified example of the processing of FIG.

FIG. 12 is a flowchart showing a fifth embodiment of the present invention.

13 is a flowchart showing a modified example of the processing of FIG.

FIG. 14 is a flowchart showing a sixth embodiment of the present invention.

FIG. 15 is a flowchart showing a seventh embodiment of the present invention.

FIG. 16 is a block diagram illustrating an example of a video camera control device.

17 is a circuit diagram showing a detailed configuration of a power supply circuit in FIG.

FIG. 18 is a screen diagram showing an example of a reduced power display.

FIG. 19 is a block diagram showing a detailed configuration of an arithmetic and control unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Infrared light generating device 2 Eyepiece lens 3 Eyeball 4 Photoelectric conversion element 5 Eye-gaze position analysis device 6 Arithmetic control device 7 Character generator 8 Display drive device 9 Monitor 10 Subject 11 Focus lens 12 Variable magnification lens 13 Aperture 14 Imaging photoelectric conversion element 15 , 16, 17 Actuator 18, 19, 20 Driver 21 Control device 26 Switch 28 Switch 29, 30, 31, 32, 34, 37 Line 35 Unregulated line 36 Battery 37 Synchronous signal generating circuit 38 Driving circuit 39, 40 DC- DC converter 41, 42, 44, 45, 48, 49, 51, 52 Resistance 47, 54 Comparator 55, 58, 61 Switch 56 Power supply circuit 59 Resistance 63 Variable resistance 65 Control section 66 Storage section

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H04N 5/232 H

Claims (5)

[Claims] 1. Storage means for storing information on a controlled object, control means for rewriting the stored information by the first storage means or adding another information, and power reduction for detecting an output state of a battery as a power source. A control device comprising a state detection means, comprising: a selection means for selecting execution or non-execution of the storage means and the control means based on a detection result of the power reduction state detection means. . 2. The control device according to claim 1, further comprising means for causing an operator to recognize execution or non-execution by the selection means. 3. The control device according to claim 1, wherein the selecting unit limits the execution time when the storage unit and the control unit are executed. 4. The control device according to claim 1, wherein the power reduction state detection means can change a condition for the detection. 5. The control according to claim 4, wherein the condition for detection by the power reduction state detection means can be changed according to completion or suspension of execution of the storage means or the control means. apparatus.