JPH0473627A - Temperature compensation device for camera - Google Patents

Abstract

PURPOSE:To compensate temperature under an optimum state by fetching the detection output of a temperature sensor every fixed time, calculating the temperature data of compensating temperature and compensating the temperature characteristics of respective units based on the calculated temperature data. CONSTITUTION:The temperature sensor 6 always detects ambient temperature. Besides, an interval timer 9 executes counting every fixed time and outputs it. An arithmetic means 10 inputs the temperature data detected by the sensor 6 every time the timer 9 outputs and measures the temperature at that time. Based on the measured result and the former measured result, discrimination whether the measured temperature at that time is a rising tendency or a falling tendency and the changing rate thereof are calculated by a prescribed operation expression. A controller 2 executes the suited compensation of the temperature characteristic for every various kinds of units 4, 5 and 12 - 14 based on the operated result by the arithmetic means 10. Thus, the actions of the respective units are precisely controlled and they are applied in a wide range by the change of the operation expression.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a temperature compensating device for a camera, and more specifically, to a temperature compensating device for a camera, and more specifically, a device for detecting ambient temperature at regular intervals.

Based on the trend of detected temperature changes, autofocus (hereinafter r)
The present invention relates to a camera temperature compensation device that performs various corrections on AFJ (AFJ) data, film feed data, etc.

[Conventional technology]

In recent years, cameras have become increasingly high-g & low-power and highly accurate, and it has become necessary to correct various characteristics due to temperature changes.

Conventionally, this type of compensation means measures the temperature at that point with a temperature sensor, and adjusts A according to the measured data.
Various compensation methods have been adopted, such as compensation for the F unit and feeding means.

[Problem to be solved by the invention]

However, changes in characteristics due to temperature (changes over time) are not constant, and in particular, some camera components require several hours for their characteristics to change after the temperature changes.

For this reason, even if various corrections are made at the time the temperature is measured, accurate temperature compensation may not be achieved.

For example, even if you correct the AF data using the method described above, it may not result in accurate focus, or even if you correct the film feeding unit, 8 perforations may not correspond to one frame of film. Instead of controlling the feed of one frame of film, it is as if the feed of one frame of film is controlled by 7 or 9 perforations.

This invention was made in view of the above-mentioned circumstances, and its purpose is to provide a unit with slow characteristic changes and/or
To provide a temperature compensation device for a camera that can perform temperature compensation in an optimal state, perform temperature compensation with higher precision, and operate the camera with higher precision in either case of a high-speed unit or a high-speed unit. There is a particular thing.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a temperature sensor that detects the ambient temperature, a timer that measures and outputs time at predetermined intervals, and a temperature sensor that measures the temperature every time it receives the output from the timer. A calculation means that detects the ambient temperature with a sensor and calculates a temperature change trend based on the detected output, and a control device that performs various corrections based on the calculation results of the calculation means, taking into account the response delay to temperature changes of each correction target. It is characterized by having the following.

[Effect]

Temperature compensation bag for camera configured as above! In this case, the temperature sensor constantly detects the ambient temperature, and the timer measures and outputs the time every certain period of time. Every time this timer outputs, the calculation means inputs the temperature data detected by the temperature sensor.

The temperature at that point in time is measured, and based on the measurement result and the previous measurement result, a predetermined calculation formula is used to determine whether the measured temperature at that point is on an upward trend or a downward trend and the rate of change thereof. The control device compensates for the temperature characteristics suitable for each of the various units based on the results of the calculation by the calculation means.

〔Example〕

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

FIG. 1 is a block diagram showing the overall configuration of an embodiment of a temperature compensation device for a camera according to the present invention.

In FIG. 1, 1 is the central processing unit fil! (hereinafter r(
A control device 2 in this CPUI controls an AF (autofocus) IC 3 to drive an AF unit 4 to focus on a desired subject (not shown).
It is designed to perform focusing drive. The AF unit 4 and the feeding unit 5 are subject to temperature compensation here.

The feeding unit 5 winds up one frame of film when one frame of film is taken, and rewinds all the wound frames of film after all frames have been taken.
The film is fed by controlling the drive of the feeding motor 5a by the control device 2 of I. 6 is a temperature sensor that detects the ambient temperature, and this temperature sensor 6 is connected to the camera body (not shown).
is placed at a predetermined location. The analog signal corresponding to the ambient temperature detected by this temperature sensor 6 is
The signal is input to an analog/digital (hereinafter referred to as rA/DJ) converter 7 in the UI, where it is digitized and transferred to the memory 8.

It is meant to be remembered.

The detection output of the temperature sensor 6 is sent to the A/D converter 7 at predetermined time intervals by an interval timer 9 as a timer.

The interval timer 9 measures time at predetermined time intervals under the control of the control table W2, and outputs an output to the A/D converter 7 and memory 8 every time the predetermined time elapses. The memory 8 stores the output of the A/D converter 7 under the control of the control device 2 every time the interval timer 9 outputs it, and also stores the previously stored data and the current data detected by the temperature sensor 6. The data digitized by the A/D converter 7 is output to a temperature compensation calculation unit 10 as calculation means.

The temperature compensation calculation unit 10 inputs the previous stored data in the memory 8 and the current data after A/D conversion of the temperature sensor 6, and determines whether the temperature change is on an upward trend or a downward trend. At the same time, in order to perform temperature compensation according to the temperature compensation target, compensation data is calculated and output to the control table W2.

The control device 2 is configured to perform temperature compensation control of the AFIC 3 of the AF unit 4, the feeding unit 5, etc. based on the compensation data output from the compensation temperature calculation section 10.

The switch 11 is a switch that turns on and off twice when the film is fed by the feeding unit 5 for one frame. By outputting to the control device @2, under normal conditions, it detects the winding of one frame, and when all frames are wound, it detects the end of winding the film, that is, detects the end of the film, and when the film is finished rewinding, it detects the winding of the film. It is designed to perform things such as detection.

In addition, 12 is a photometry unit, 13 is a shutter unit,
14 is a distance measuring unit, which also exchanges data with the CPUI.

The operation of this embodiment configured in this way is shown in Figures 2 to 5.
This will be explained along the flowchart in the figure.

The flowchart in FIG. 2 shows the flow of operations for measuring temperature while the camera is not operating.

In the "camera operation" processing step of the flowchart in FIG. When a switch (not shown) is turned on, the control device 2 causes the photometry unit 12 to perform photometry, measures the distance of the subject with the distance measurement unit 14, receives each photometry information and distance measurement information, and then releases the shutter. The unit 13 controls the proper exposure, and also controls the AF
The IC 3 is controlled, and the AF IC 3 drives the AF unit 4 to focus on the subject.

Next, the release button is pressed two steps to turn on the second release switch (not shown), and the control device 2 opens and closes the shutter unit 13 to perform exposure and photograph one frame of the subject. When finished, the control device 2 causes the feeding unit (motor driver) 5 to control the motor 5a.
is driven to wind one frame of film, and a series of camera photographing operations, ie, "camera operations" are completed.

After this photographing operation is completed, the control device 2 shifts to the "pause" process in the flowchart in order to reduce power consumption, and the camera operation enters a hibernation state.

Next, the process moves to the determination processing step ``Activation by 1-hour timer?J'' in the flowchart, and the interval timer 9 in CP L-1 is activated by this control device 12 and starts measuring time.

In this case, the interval timer 9 outputs an output every 1 hour, but within this 1 hour, for example, the operation of the release button, the operation of the strobe switch (not shown), the self-timer button, the ISO selection button, and other various switches, etc. Alternatively, when these switches are operated, the flow chart exits to the NO side and returns to the "camera operation" process in the flow chart.

Also, by timing with interval timer 9.

When one hour has been counted, the process moves from the YES side of "Start by one hour timer?" to the "Temperature sensor input" processing step in the flowchart, and the interval timer 9 is activated.
The signal is output from the A/D converter 7 and the memory 8.

As a result, the analog detection output of the ambient temperature detected by the temperature sensor 6 is input to the A/D converter 7, and the process moves to r A/D conversion/storage and A(x)J processing steps in the flowchart.

In this processing step, the control device 2 causes the A/D converter 7 to
A command is issued to convert the analog detection output of the temperature sensor 6 into a digital signal, and the digital data is further transferred to the memory 8, stored in the memory 8, and returns to the "pause" processing step in the flowchart. Repeat the above operation each time.

In this way, every hour, from "pause" in the flowchart to rA/D conversion/storage A(X)J in the flowchart.
In the processing routine, when any operation switch is operated, the control device 2 changes the content of temperature correction for each unit based on the detected force of the temperature sensor 6 stored in the memory 8.

In this case, for example, by pressing the release button one step, the second release switch R1 is turned on and the control device I
When the ranging unit 14 is activated by i2,
Since the distance measuring unit 4 and the AFI C3 have a small volume and their characteristics change quickly, temperature compensation is performed using the temperature detection output of the temperature sensor 6 immediately after the interval timer 9 is started.

In this case, temperature compensation is performed according to the procedure shown in the flowchart of FIG.

That is, when the release button is pressed one step in the "pause" processing step of the flowchart in FIG.
When the No. 1 Lullies switch is turned on, the process moves to the "temperature sensor input" processing step in the flowchart, and the control device 2
issues a control command to the A/D converter 7 and memory 8. Then, the A/D converter 7 converts the analog temperature detection signal from the temperature sensor 6 into a digital signal, and then sends the output of the A/D converter 7 to the compensation temperature calculation section 1o. Upon receiving this output, the compensation temperature calculation section 10 calculates the temperature H to be compensated for, and stores it in the memory 8.

Furthermore, at the same time as the above-mentioned Luriez switch is turned on, the "distance measurement" process of the two-chart is also performed, and the second distance measurement unit 14 is driven by the control device 2 to measure the distance to the subject, and the distance data is is sent to the control device 2, and the process moves to the "correction using H data" processing step in the flowchart.

In this processing step, the control device 2 immediately performs temperature compensation on the AFIC 3 using the temperature data H stored in the memory 8, and uses the temperature compensated AF
The AF unit 4 is driven by the IC3.

As a result, the photographing lens (not shown) is extended in the "lens extension" processing step of the flowchart to focus on the subject, and the process proceeds to the "shunter operation" processing step of the flowchart.

In this way, after focusing, press the release button two steps and turn on the second release switch.
The shutter unit 13 is controlled by the control device [2,
The shutter is opened and closed at the shutter speed determined based on the photometric data measured by the photometric unit 12, and the photographing of one frame is completed.

In addition, in the case of motors and gear film feeding mechanisms, the characteristics gradually change due to temperature changes, resulting in changes in winding force, winding speed, winding amount, battery voltage, etc.
It is necessary to properly compensate the victims.

FIG. 4 is a flowchart showing a processing routine for temperature compensation when the characteristics change slowly.
Specifically, a case is shown in which temperature compensation of feeding data is performed.

The “pause” process in the flowchart in FIG.
This is similar to the "pause" process shown in the figure, and when the release button is pressed one step from the pause state and the first Lurie switch is turned on, light metering by the photometry unit 12 and distance measurement by the distance metering unit 14 are performed. As well as each,
Moving on to the processing step of "temperature sensor input/storage/time measurement since last time" in the flowchart, the control device 2 selects A.
/D converter7. Memory 8 and interval timer 9
control.

With this, the control device! ! ! Under the control of 2, A, / D
The converter 7 converts the detection output of the temperature sensor 6 into a digital signal and stores this digital signal in the memory 8, and the interval timer 9 converts the detection output of the temperature sensor 6 detected last time into a digital signal. The time (T) from the time when the current detection output of the temperature sensor 6 is input to the A/D converter 7 is measured and stored in the memory 8, and the rA/D conversion/data in the flowchart → D. Time measurement result → Transition to TJ processing step.

In this processing step, under the control of the control device 2, the compensation temperature calculation unit 10 converts the digitized data of the detection output of the temperature sensor 6 into D and the previous detection output of the temperature sensor 6 measured by the interval timer 9. The time measurement result T from the time of input to the /D converter 7 to the time of input of the detection output of the A/D converter of the current detection output of the temperature sensor 6 is stored in the memory 8.
"Temperature data H=A1+" in the flowchart.
A2 +D T '', the compensation temperature calculation unit 10 moves to the processing step.

This temperature data H is calculated. This calculation formula for the temperature data H shows an example of calculation when the 5-feeding unit 5 reaches a steady state 3 hours after the temperature changes, and is determined by measuring each characteristic.

Further, in the above equation (1), A1 is the interval temperature measurement data stored in the memory 8 two times before.

A2 is the previous interval temperature measurement data stored in the memory 8.

It is.

Once the temperature data H is calculated by the compensating temperature calculation unit 10 using the calculation formula (1) above, the process moves on to the "photographing operation" in the flowchart, the release button is pressed two steps, and the second
When the release switch is turned on, the shutter unit 13 is driven by the smart device W2, the shutter is opened and closed, and the photographing operation is completed, the process moves to the "winding operation (correction by H)" processing step in the flowchart. .

In this processing step, the control device 2 corrects the winding operation of the feeding unit 5 using the temperature data H calculated by the compensation temperature calculation unit 10 and in which the correction is delayed, and performs one-frame feed detection control and the like. It is possible to detect the end of the film with higher precision.

In the "winding operation (correction by H)" processing routine in this flowchart, it is confirmed whether or not the winding control for one frame of film is being performed accurately using the subroutine in the flowchart shown in FIG. conduct.

In this case, when the switch 11 is fed by one frame of the film, it is turned on and off twice, and by observing this signal while the film is being fed, the end of the film, the end of rewinding, etc. are detected.

That is, in the flowchart of FIG.

After confirming that the shutter is closed, turn on the “Motor ON” in the flowchart.
In the processing step J, the feeding unit 5 moves the remoter 5a
is turned on, a feeding mechanism (not shown) is driven, and feeding of the film is started, whereby the switch 11 is set to rHJ in the process step "rwsw" in the flowchart.
The determination of rLJ is performed by the control device [2.

Here, when the switch 11 is on, it is "L", and when it is off, it is rHJ. If rHJ is output twice and "L" is output twice within a predetermined period of time, the film will be correctly loaded for one frame. It will be determined that it is being fed.

Now, in "rwsw■" in the flowchart, if the output of the switch 11 is rHJ, the output is rLJ in the flowchart.
From the side, the process moves to the "timer ■" processing step in the flowchart.

In this process step 1, for example, when the ambient temperature drops, the output of the power supply battery decreases and the winding time of the feeding unit 5 becomes longer, so the predetermined timer time is exceeded even though one frame is being wound. In order to prevent malfunctions such as detecting that all five frames have been wound (end detection) and starting rewinding, the control device 2 increases the timer time, but the data compensated by the above equation (1) The timer changes based on. If the timer time set in this way does not exceed the rws in the flowchart
w■? ” returns to processing. On the other hand, when rLJ has elapsed beyond the set value of the timer time with a longer set value, in other words, when the initial on time of the switch 11 becomes longer than a predetermined value, the process proceeds to "Rewind ■" in the flowchart, and the control device [ 2 drives the motor 5a of the feeding unit 5, and the feeding unit 5 rewinds the film.In other words, the temperature is corrected by the control device 2 based on the temperature data H, so that a normal rewinding operation is performed. That means that.

Also, rWsWl↓ in the flowchart? '', if the switch 11 is turned off and its output is rHJ, then rwsw■? in the flowchart? Proceeds to the determination processing step of "Timer ■" in the flowchart, and again determines whether the switch 11 is on or off. If the switch 11 is off and its output is rHJ, the flowchart's "Timer
? If the "rH" state exceeds the predetermined time, the process proceeds to the "rewind ■" process step, but if it is less than the predetermined time, rwsw■? ” returns to the processing step.

Also, the flowchart rwsw■? When the switch is turned on and the output of the switch 11 becomes "L" for the first time in the determination processing step of ", rwsw■?" in the flowchart.
If it is rLJ, the process moves to the processing step of "Timer ■?" in the flowchart.

In this processing step, similarly to the processing step of "Timer ■" in the above flowchart, if the set time does not reach the long set time based on the calculated temperature data H, then rWsW3? '', if the set time has elapsed, the process proceeds to step 1 of ``Rewind ■'' in the flowchart, and the feeding unit 5 is controlled by the control device 2 to perform a 1-rewind operation to determine the end of the film.

Also, rWSW■? of the flowchart? In the determination processing step J, the switch 11 is turned off for the second time,
If the output is the second rHJ, then rwsw■? in the flowchart? The process moves to the determination processing step of J.

rwsw■ of this flowchart? If the switch 11 is turned on for the second time in the determination process step of ``, and its output becomes rlJ for the second time, the process proceeds to ``stop the motor'' in the flowchart, and the control device 2 controls the feed unit 5 to stop. The drive of the motor 5a is stopped, and the series of processes returns. However, rwsw ■? '', if the switch 11 is off and its output is H, the process proceeds to the process step of ``timer ■?'', and the same operation as the process step of ``the above-mentioned timer ■?'' is performed.

2, according to this embodiment, the detection data of the ambient temperature detected by the temperature sensor 6 is taken into the CPUI at regular intervals by the interval timer 9, and the compensation temperature calculation unit 1
0, the tendency of temperature change (rate of change) is determined, and based on the determination result, the control device 2 is configured to perform temperature compensation for each unit, taking into account the appropriate time lapse. Therefore, unlike the conventional method of performing various corrections using the temperature at the time of control of each unit, even if the temperature characteristics of each unit are in a turbulent period when the temperature suddenly changes, it is possible to accurately perform various corrections. Temperature compensation can be performed, and highly accurate temperature compensation is possible with a relatively simple configuration.

Furthermore, by changing the calculation formula for temperature data according to the slowness of the temperature characteristics of each unit, there is an advantage that it can be applied to a wide range of temperature compensation.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without departing from the spirit of the invention.

〔Effect of the invention〕

As described in detail above, according to the present invention, the ambient temperature is detected by the A degree sensor, and the temperature data of the compensation temperature is calculated by the calculation means by taking in the detection power of the temperature sensor at fixed time intervals by the timer. Since the control device is configured to compensate the temperature characteristics of each unit using the calculated temperature data, it is possible to compensate with a relatively simple configuration and with high accuracy according to the slowness of the temperature characteristics of the unit to be compensated. can. Therefore, the operation control of each unit is performed accurately.

Moreover, by changing the arithmetic expression, it is possible to provide a camera temperature compensation device that can be applied in a wide range of areas.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the overall configuration of an embodiment of a temperature compensation device for a camera according to the present invention, and FIG. 2 is a flowchart of the operation when the camera of the embodiment enters a rest state from an operating state. FIG. 3 is a flowchart showing the operation flow when performing temperature compensation for AF data in the same embodiment, and FIG. 4 is a flowchart showing the operation flow when temperature compensation is performed for the feeding drive in the same embodiment. FIG. 5 is a flowchart showing a subroutine of the winding operation in the main routine shown in FIG. 4. 1... Central processing unit, 2... Control device, 3... AFICl 4... AF unit, 5... Feeding unit, 5a... ...
Motor, 6... Temperature sensor, 7... A/D converter, 8... Memory, 9... Interval timer 10... Compensation temperature calculation Part, 11...
Switch, 12...Photometering unit. 13...Shutter unit, 14...Distance measurement unit. Chart procedural amendment April 24, 1991

Claims (1)

[Claims] (1) A temperature sensor that detects the ambient temperature, a timer that measures and outputs time at predetermined intervals, and the temperature sensor that detects the ambient temperature each time it receives the above output from the timer. A temperature compensation device for a camera, comprising a calculation means for calculating a temperature change tendency based on an output, and a control device for performing various corrections based on the calculation results of the calculation means, taking into account the response delay to temperature changes of each correction target.