JP2004102987A - Camera using rewritable memory - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system capable easily and positively modifying a processing program as needed. <P>SOLUTION: A CPU 28 has a ROM 29 exclusive to reading and a RAM 30 for reading and writing in its interior, and it executes a predetermined process. It receives the processing program in an FM 32 via a plurality of lines, and it executes control following the processing program. A CPU 28 composes a serial communication line with a program rewriting device 50 via an interface means 34 and terminals 8A-8C. Deletion and rewriting of the processing program in the FM32 is carried out in accordance with an operation signal of the rewriting device 50. A power supply for the FM 32 is applied with voltage by the rewriting device 50 via a terminal 8F, and the CPU 28 carries out deletion/rewriting operation to the FM 32 only when a voltage in a comparator 62 is a predetermined voltage or more. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
[Industrial applications]
The present invention relates to a camera having a large-capacity rewritable memory from the outside.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, the computerization of cameras has advanced, and a high-performance microcomputer (hereinafter abbreviated as CPU) has been used to perform automatic exposure, focusing, film feeding, strobe control, and the like.
[0003]
Taking automatic exposure as an example, first, a subject luminance signal and a sensitivity signal of a loaded film are read from a photometric sensor provided in a camera, and the values are read out by a calculation stored in a ROM in advance. Calculation is performed according to the method, and an appropriate exposure condition is obtained. Then, a signal is output to a display device provided outside the CPU to notify the photographer of the result. Further, when the shutter button is pressed, a control signal is output to an external actuator so that the aperture value of the lens and the opening time of the shutter become as calculated.
[0004]
As is well known, such a CPU is of a so-called one-chip type, in which an input / output control device, a read-only memory (hereinafter abbreviated as ROM) for storing the contents and order of processing, and a temporarily stored input signal are stored. A readable / writable memory (hereinafter abbreviated as a RAM) for temporarily storing, and a logic device for executing calculations and the like are provided.
[0005]
As is well known, a ROM in a CPU is created in accordance with a processing program in a masking step of the manufacturing process (referred to as a mask ROM), so that a change after the manufacturing is impossible at all. If an error is found in the processing program, or if you want to use an advanced arithmetic program corresponding to a sensor with better performance, or if you change the processing program due to a change in actuator specifications, the manufacturing process In the past, the CPU itself had to be newly recreated, and further, had to be reattached to the circuit board in the camera by soldering or the like.
[0006]
Also, a so-called one-time CPU, which is used transiently at the time of product start-up such as a prototype, can only be electrically written into the internal ROM, so there is no need to go through a manufacturing process like a mask ROM, and a processing program Although there is an advantage that the confirmation can be performed early, it is impossible to erase the written processing program similarly to the mask ROM, and it is impossible to use the processing program repeatedly. In addition, refitting by soldering was necessary.
[0007]
On the other hand, in recent years, flash memories (hereinafter abbreviated as FM) have been developed. An FM is similar to a so-called EEPROM in that electrical erasing and rewriting can be repeated. However, since the internal structure is simple, a large-capacity memory can be formed on a small chip, and the operation of the CPU is instructed. It is said that storage of several tens of kilobytes or more, such as a processing program, is easy.
[0008]
[Problems to be solved by the invention]
As described above, there is a problem that it is impossible to quickly change the processing program in the ROM despite the purpose of improving the performance of the camera.
Therefore, an object of the present invention is to provide a system that can easily and reliably modify a processing program as needed.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the camera according to the first aspect of the present invention includes a microcomputer, a large-capacity electrically erasable and rewritable memory for storing a control program for instructing the operation of the microcomputer, and temporarily storing data. Command and / or program data transmitted from an external device is temporarily stored in the temporary storage memory, and is temporarily stored in the temporary storage memory by a processing instruction relating to erasure rewriting to the large-capacity memory. The stored command and / or program data is transferred to the large-capacity memory.
[0010]
Further, in the invention according to claim 2 dependent on claim 1, the command and / or program data is sent under the control of the external device.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a first embodiment according to the present invention, and is an example of an electric circuit diagram of a camera using a flash memory (FM) as an example of a large-capacity memory.
This circuit operates by power supply from a DCDC converter 21 using a battery 20 as a power supply.
[0012]
The DCDC converter 21 has two voltage outputs 22 and 23. The voltage 22 is a low voltage of about 5 V in this embodiment, and is used for driving each control circuit including a CPU 28 and an FM 32 described later. The voltage 23 is a high voltage of about 12 V in this embodiment, and is used for driving a distance measuring means 27 described later.
The input signals to the CPU 28 for executing the central control are as follows.
[0013]
First, the photometric unit 24 is a known sensor unit composed of a photodiode for measuring the brightness of a subject, and photometric value information is input to the CPU 28.
The film sensitivity detecting means 25 reads coded sensitivity information provided on the side of the loaded film cartridge or the like, and the film sensitivity information is input to the CPU 28.
The switch detecting means 26 includes a manually operated switch including a switch linked to a release button 4 and a mode setting button 7 to be described later, a timing switch for detecting a sequence state of the camera, and the like. Is entered.
The distance measuring means 27 is a known sensor means such as a CCD for measuring the in-focus state of the subject, and distance measurement value information is input to the CPU.
The output from the CPU 28 executes the following driving via the driver means 33. The LCD 6 is driven to display information on exposure and operation mode setting, warning information, and the like.
By controlling the shutter 11, a predetermined exposure time is given to the film surface.
An aperture 35 in the lens 2 described later is driven to control the amount of light passing from the subject.
The motor 36 is driven to control film winding, rewinding and feeding. The operation timing is in accordance with a signal from the switch detecting means 26.
By driving the motor 37, a lens group in the lens 2 described later is moved, and control is performed so that the subject is focused.
[0014]
Further, the CPU 28 performs data communication with the data back 5 described later or the program rewriting device 50 through the interface means 34 and the terminals 8A to 8F with a plurality of signal lines.
The part related to the present invention in FIG. 1 will be described in detail below.
The CPU 28 has a read-only ROM 29 and a read / write RAM 30 therein, a logical operation unit (not shown), an AD converter, and the like, and executes predetermined processing. Further, the FM 32 receives a processing program therein through a plurality of lines and executes control according to the processing program. These will be described later with reference to the flowchart.
[0015]
Here, the ROM 29 is a read-only memory as described above, and stores only a processing program necessary for erasing and rewriting the FM 32 via the interface circuit 34. Therefore, when an erasing command of the FM 32 is input via the interface circuit 34, the operation is controlled, and when the command is deleted and a new program is rewritten, the operation of only performing the operation is performed.
The CPU 28 can execute the original operation of the camera 1 after such a processing program is stored in the FM 32.
The CPU 28 transmits and receives the following signals via the interface unit 34. First, a serial communication line is formed via the terminals 8A to 8C. A clock signal is transmitted in one direction from the camera 1 via the terminal 8A, a handshake signal is transmitted / received via the terminal 8B, and a data signal is transmitted / received via the terminal 8C. The configuration and detailed data of the serial communication line as described above are known.
[0016]
Further, it transmits the imprint signal to the data back 5 via the terminal 8D. The imprint signal is a signal generated according to the timing at which the camera 1 starts the exposure operation, and the data imprint operation described later by the data bag 5 is executed using this signal as a trigger. In this case, the terminal 8F is not used.
As will be described later, the terminals 8A to 8F are also connected to the program rewriting device 50 to exchange various signals.
[0017]
In this case, the processing program in the FM 32 is erased and rewritten according to the operation signal of the rewriting device 50. The program to be written is transmitted via the serial communication line at terminals 8A to 8C as described above. At this time, the imprint signal terminal 8D is not used.
The terminal 8F is a power supply terminal to which power for erasing and writing is applied to the FM 32, and a high voltage of about 12 V is applied from the rewriting device 50 only when erasing and rewriting are executed. Thus, it is not necessary to prepare a power supply required only when erasing and rewriting the FM 32 in the camera 1. Since the rewriting device 50, which will be described later, is always required at the time of erasing rewriting, it is sufficient to equip the rewriting device with a necessary power supply.
[0018]
Further, the voltages of the battery 20 and the power supply terminal 8F are applied to input terminals of comparators 60 and 62 to which reference voltage sources 61 and 63 are applied, respectively. Then, both outputs of the comparators 60 and 62 are transmitted to the AND gate 64, and the output of the AND gate 64 is connected to the CPU 28.
As a result, when one of the battery voltage 20 and the power supply terminal 8F is lower than the predetermined voltage, the output of the AND gate 64 informs the CPU 28 of that fact. If the erasure rewriting of the FM 32 is performed when the battery 20 is depleted or the voltage of the power supply terminal 8F is low for some reason, erasing may not be completely completed or the processing program may be rewritten in an incorrect state. Because there is.
FIG. 2 is an explanatory view of the form of the camera 1 according to the present invention.
The camera 1 is in a state where the lens 2 is mounted and the data bag 5 also serving as a back cover is opened. A film cartridge (not shown) is loaded in a cartridge chamber 10, and a film drawn from the cartridge passes through the front surface of a shutter 11 and is wound around a spool 12. The film is fed by a motor 36 provided inside the spool 12.
[0019]
As is well known, the photographer visually recognizes the situation of the subject passing through the lens 2 from the viewfinder 3 and instructs the start of exposure by pressing the release button 4.
The exposure mode and various conditions can be confirmed on the LCD 6. The button 7 is an operation button for arbitrarily setting an exposure mode, a photographing condition, and the like of the camera 1, and is operated while checking characters and the like on the LCD 6.
A plurality of terminal groups 8 are provided below the shutter 11. These are the terminals 8A to 8F described with reference to FIG. 1, and their functions have been described.
The pressure plate 14 provided inside the data bag 5 has a function of pressing a film (not shown) against the aperture 6 to maintain the flatness, and has a hole 13 for optically transferring various data to the film.
[0020]
A contact group 15 is disposed at a position facing the terminal group 8 of the camera 1 described above. When the data bag 5 is closed, the contact groups 8 and 15 come into contact with each other to form the above-described electric circuit for data transfer.
FIG. 3 shows an example of an electric circuit in the data bag 5.
The data bag 5 has a function of imprinting one of two types of calendar data relating to the date and exposure data transmitted from the camera 1.
The central function is controlled by a CPU 40 driven by a battery 41. Time information can be obtained by always counting a constant frequency from an oscillator connected as a calendar function.
Exposure data is instructed from the camera 1 by a data communication function using the terminals 15A to 15E. The terminal 15D receives a timing signal for imprinting.
Which data is to be imprinted can be selected by a setting member (not shown) provided on the surface of the data bag 5, and the contents can be confirmed by the LCD 42.
[0021]
Here, the display contents of the LCD 42 are expressed almost directly by the imprinting LCD 43. The LCD 43 is exposed through the hole 13 on the pressure plate 14, and the lamp 44 is turned on for a predetermined time at the timing according to the above-mentioned imprinting signal, so that the display contents of the LCD 3 are imprinted on the film as it is.
FIG. 4 is a conceptual diagram of a program rewriting device 50 for erasing and rewriting a processing program in the FM 32 in the camera 1.
With the personal computer 52 as the center, the processing sequence of the rewriting operation and the processing program to be written to the FM 32 are stored in a floppy disk (hereinafter referred to as FD) 51. As is well known, the personal computer 52 executes its operation according to the information in the FD 51. The rewriting device 50 has terminals 16A to 16F, and transmits and receives a rewriting command and a processing program while being in contact with the terminal group 8 of the camera 1. Since the operation related to imprinting is irrelevant, the terminal 16D has no function.
[0022]
When rewriting the processing program of the FM 32 in the camera 1, the personal computer 52 is connected to the camera 1 via the terminals 16A to 16F, and the personal computer 52 is operated based on the FD 51. As described later, a voltage of about 12 V is applied to the terminal 16F at the beginning of the processing so that the FM 32 in the camera 1 operates. Then, necessary data is transmitted by serial communication via the terminals 16A to 16C.
FIG. 5 is an example of a processing routine by the CPU 28 in FIG.
This routine is repeatedly executed while power is supplied.
In step S1, data communication is performed via the terminals 8A to 8F. Data communication is established regardless of whether the data bag 5 or the rewriting device 50 is mounted, but the data received by the CPU 28 includes the identification data of the transmission source.
In step S2, it is determined which of the data bag 5 and the rewriting device 50 is attached based on the received data. If the identification data indicates the data back 5, the process proceeds to the normal processing after step S3. If the identification data indicates the rewriting device 50, the process jumps to step S16.
[0023]
In step S16, the voltages of the battery 20 and the terminal 8F are determined based on the output of the AND gate 64.
In step S17, if the output of the AND gate 64 is normal, the erasure rewriting of the FM 32 is executed in this routine. The details will be described in detail with reference to FIG.
In step S18, if it is determined that the output of the AND gate 64 is abnormal, that is, it is determined that one or both of the battery 20 and the terminal 8F is lower than the predetermined voltage, a warning is issued. The warning mark may blink on the LCD 6 of the camera 1 or the screen of the personal computer 52.
[0024]
In step S3, photometric information and sensitivity information from the photometric means 24 and the sensitivity detecting means 25 are fetched.
In step S4, both information obtained in step S3 are calculated based on the set exposure mode, and a shutter time and an aperture value, which are appropriate exposure conditions, are calculated.
In step S5, the exposure information or mode information obtained in step S4 is displayed on the LCD 6.
In step S6, the focus information of the subject from the distance measuring means 27 is fetched.
In step S7, the motor 37 is driven based on the focusing information, and the lens group in the lens 2 is moved to focus on the subject.
In step S8, it is determined whether or not the release button 4 has been pressed via the switch detection means 26. If not, the process returns to step S1 and repeats the above processing.
[0025]
In step S11, since the release button 4 has been pressed, the reflection mirror (not shown) is first raised and retracted from the photographing optical path.
In step S12, the aperture 35 is controlled to have a predetermined aperture.
In step S13, the exposure to the film is controlled by opening and closing the shutter 11 for a predetermined time.
In step S14, since the exposure operation has been completed, the reflection mirror (not shown) is lowered.
In step S15, the motor 36 is rotated forward to perform the feeding of the film and the urging operation of the mechanism.
[0026]
Since the exposure operation has completed one cycle, the process returns to step S1 to repeat the above processing.
[0027]
FIG. 6 is a detailed embodiment of the rewrite processing routine shown in step S17 in FIG.
[0028]
This processing routine follows a non-rewritable program stored in the ROM 29 in the CPU 28. A processing program received via the terminals 8A to 8F and the interface circuit 34 is temporarily stored in the RAM 30 in the CPU 28, and then transferred to and stored in the FM 32.
In step S22, data communication with the rewriting device 50 is performed.
In step S23, the data from the rewriting device is decoded to determine which of the writing mode and the erasing mode is instructed.
In step S24, since the erase mode has been instructed, the information in the FM 32 is erased.
In step S25, it is determined whether the erasure of information in the FM 32 has been completed. When the rewriting is completed, the fact is transmitted to the rewriting device 50 described later. While it is not completed, the erasing process from step S24 is repeated.
In step S26, data from the rewriting device 50 is received. The data transmitted in this case is a processing program that is to be newly stored in the FM 32.
In step S27, the received processing programs are sequentially stored in the FM32.
In step S28, it is determined whether the writing process has been completed. When the rewriting is completed, the fact is transmitted to a rewriting device described later. While the writing is not completed, the writing process from step S27 is repeated.
In step S30, this routine is a routine for preventing a malfunction. It is checked whether the erasing process for the FM 32 has been completed although the writing mode has been instructed. If the erasure has not been performed, the erasure process from step S24 is executed. If it has already been completed, the flow shifts to step S26 to execute a write process.
[0029]
FIG. 7 is an example of a processing routine by the CPU 40 in the data bag 5. This routine is repeatedly executed while the battery 41 is connected to the CPU 40.
In step S40, a calendar process such as time measurement, that is, date, is performed based on the output frequency count by the oscillator 45.
[0030]
In the present embodiment, the calendar processing is executed only in step S40 for the sake of simplicity, but a method in which the processing is executed in parallel with the processing shown in step S41 and thereafter may be used.
In step S41, data communication is performed with the camera 1, and first, the fact that the communication partner is the data back 5 is transmitted to the camera 1. Further, various exposure information is received from the camera 1 as imprint data. This step corresponds to step S1 in FIG.
[0031]
As described above, data is transmitted and received by known serial data communication via the terminals 15A to 15E. At this time, since the exposure sequence of the camera 1 has not yet been entered, the imprint signal via the terminal 15D has not been input.
In step S42, the printing mode selected by the setting means (not shown) is determined. In the case of the present embodiment, either the calendar mode indicating the date and the exposure data mode can be selected.
In the case of the calendar mode, the process proceeds to step S43, and in the case of the exposure data mode, the process proceeds to step S44.
In the step S43, the date data is displayed on the LCD. As described above, the driving output of the CPU 40 is also applied to the imprinting LCD 43 in parallel, so that the LCD 42 and the LCD 43 display almost the same contents.
In step S44, the exposure data is displayed on the LCD 42 as shown in FIG. Although the shutter time and the aperture value are given in the embodiment, the present invention is not limited to this, and data directly related to exposure such as the type of lens used or data not related to exposure such as the type of the camera 1 may be used.
In the step S45, the terminal 15D is monitored to determine whether or not an imprint signal is input from the camera 1. If the imprint signal has not been input, the processing from step S40 is repeated.
In step S46, since the imprint signal has been input, the lamp 44 is turned on for a certain period of time, and the data displayed on the LCD 43 is optically recorded on the film.
[0032]
FIG. 8 is an example of a processing routine of the rewriting device 50. As described above, the personal computer 52 executes the following processing according to the command stored in the loaded FD 51.
In step S50, data communication is performed with the camera 1, and firstly, the camera 1 is notified that it is the rewriting device 50. This step corresponds to step S1 in FIG. 5, but unlike step S41 in FIG. 7, no data for imprinting or the like is transmitted from the camera 1.
As described above, data transfer is performed by known serial data communication through a part of the terminals 16A to 16F. However, unlike the data back 5, the terminal 16D is not used because it is not related to the imprinting operation.
[0033]
As a result of this communication, the camera 1 stops the original processing and enters the rewriting processing described in FIG. 6 after step S16 in FIG. 5 in preparation for rewriting the FM32.
In step S51, the erase / rewrite voltage of about 12 V is output to the FM 32 of the camera 1 via the terminal 16F.
In step S52, next, the processing program in the FM 32 is erased and transmitted to the camera 1. This corresponds to step S24 in FIG.
In step S53, it is determined whether the erasure of the processing program in the FM 32 has been completed. This corresponds to step S25 in FIG.
In step S54, a new processing program to be stored in the FM 32 is transmitted. In step S55, it is determined whether all the processing programs have been stored in the FM 32. This corresponds to step S28 in FIG. When the erasure of the old processing program in the FM 32 and the storage of the new processing program are completed, the processing routine ends.
In step S56, the power supply of the voltage 12V via the terminal 16F is stopped because the erasure rewriting process of the FM 32 is completed.
[0034]
FIG. 9 shows a second embodiment according to the present invention, which is an electric circuit embodiment using a CPU 28 having a structure in which three types of memories, a ROM 29, a RAM 30, and an FM 32 are built in.
The difference from the first embodiment is that first, the high-voltage side output 23 of the DCDC converter 21 is applied to the FM 32 via the switching means 31, and the opening and closing of the switching means 31 is controlled by a signal from the rewriting device 50 via the terminal 8F. It is a point that is done.
[0035]
With this configuration, the voltage 23 is applied to the FM 32 only when the rewriting device 50 is connected to the camera 1 and the erasing and rewriting operation of the FM 32 is performed. Dangers such as erasing of the processing program can be prevented.
What is further characteristic in FIG. 9 is that a part of a processing program that is likely to be changed later as the camera 1, a processing program in the FM 32 erasable and rewritable for the photometry calculation routine and the display processing routine in this embodiment. Accordingly, with respect to the processing programs necessary for the camera 1 except for the photometry calculation routine and the display processing routine, the remaining erasing and rewriting routines of the FM 32 and the processing programs required for the camera 1 are not stored in the ROM 29 but are fixed. That is, it is configured to follow the processing program.
FIG. 10 is an example of a processing routine by the CPU 28 in FIG.
[0036]
This routine is repeatedly executed while power is supplied.
In step S1, data communication is performed via the terminals 8A to 8F. Data communication is established regardless of whether the data bag 5 or the rewriting device 50 is mounted, but the data received by the CPU 28 includes the identification data of the transmission source.
In step S2, it is determined which of the data bag 5 and the rewriting device 50 is attached based on the received data. If the identification data indicates the data back 5, the process proceeds to the normal processing after step S3. If the identification data indicates the rewriting device 50, the process jumps to step S17.
[0037]
In step S17, when the rewriting device 50 is connected, the erasure rewriting of the FM 32 is executed in this routine. The details are the same as in FIG.
In step S3, photometric information and sensitivity information from the photometric means 24 and the sensitivity detecting means 25 are fetched.
[0038]
In step S60, the arithmetic processing program stored in the FM 32 is read and temporarily stored in the RAM 30.
In step S4, both information obtained in step S3 are calculated according to the processing program obtained in step S60, and a shutter time and an aperture value, which are appropriate exposure conditions, are calculated.
[0039]
In step S61, the display processing program stored in the FM 32 is read and temporarily stored in the RAM 30.
In step S5, the exposure information or mode information obtained in step S4 is displayed on the LCD 6 according to the processing program obtained in step S61.
In step S6, the focus information of the subject from the distance measuring means 27 is fetched.
In step S7, the motor 37 is driven based on the focusing information, and the lens group in the lens 2 is moved to focus on the subject.
In step S8, it is determined whether or not the release button 4 has been pressed via the switch detection means 26. If not, the process returns to step S1 and repeats the above processing.
[0040]
In step S11, since the release button 4 has been pressed, the reflection mirror (not shown) is first raised and retracted from the photographing optical path.
In step S12, the aperture 35 is controlled to have a predetermined aperture.
In step S13, the exposure to the film is controlled by opening and closing the shutter 11 for a predetermined time.
In step S14, since the exposure operation has been completed, the reflection mirror (not shown) is lowered.
In step S15, the motor 36 is rotated forward to perform the feeding of the film and the urging operation of the mechanism.
[0041]
Since the exposure operation has completed one cycle, the process returns to step S1 to repeat the above processing.
In FIG. 10, it has been described that the processing program stored in the FM 32 is once read out to the RAM 30 and necessary processing is executed as in steps S60 and S61. However, if the arithmetic processing can be performed directly in accordance with the contents of the FM 32, There is no need to do this, saving time.
[0042]
According to these processes, only the basic processing routine that is not likely to be changed as the camera 1 can be stored in the ROM 29, so that the large-capacity FM 32 is not required, and the CPU 28 can be reduced in cost and size.
In this figure, only the photometry calculation routine and the display processing routine are processed according to the processing program stored in the FM 32. However, the present invention is not limited to this, and it is easy to adjust. In addition to the above, examples of the routine that should be stored in the FM 32 include a distance measurement calculation process in step S6, an AF motor drive process in step S7, and a feed motor drive process in step S15.
[0043]
On the other hand, the configuration of the rewriting device 50 is the same as that of FIG. 4 except that the terminal 16F is not supplied with 12 V, but is merely a signal necessary for opening and closing the switching means 31. In addition, of the steps in FIG. 8, the following two points are changed in relation to FIG. 9.
In step S51, a closing signal is output to the terminal 16F, and the switching means 31 in the camera 1 is turned on.
In step S56, an open signal is output to the terminal 16F to turn off the switching means 31 in the camera 1.
The configuration processing contents of the data back 5 are the same as those in FIGS.
[0044]
【The invention's effect】
As described above, according to the present invention, the processing program transferred for the purpose of being stored in the electrically erasable and rewritable memory from the external device is stored in the memory after passing through the temporary storage memory in the camera. Therefore, there is no need for the rewriting device connected to the camera to directly transfer data to and from the memory.
Further, since control for transferring the processing program to the temporary storage memory in the camera is performed by an external device, it is not necessary to store such an instruction in the camera.
[0045]
In the embodiment, the system using the flash memory FM has been described as an example of a large-capacity electrically erasable and rewritable memory. However, the system has a capacity capable of storing a processing program of the CPU and is provided outside the camera. Any other storage medium may be used as long as the storage medium is capable of erasing and rewriting the processing program via a predetermined terminal.
[0046]
Further, in the embodiment, an example is shown in which a data transfer terminal for rewriting a processing program from the outside is also used as a terminal for the data back 5, but a connection terminal for a detachable accessory such as a strobe or a finder. The same effect can be obtained by using.
[Brief description of the drawings]
FIG. 1 is an example of an electric circuit diagram of a camera according to a first embodiment of the present invention.
FIG. 2 is an explanatory diagram of a camera 1 according to the present invention.
FIG. 3 is an example of an electric circuit in a data bag 5 according to the present invention.
FIG. 4 is a conceptual diagram of a program rewriting device 50 according to the present invention.
FIG. 5 is an example of a processing routine by a CPU 28 in the camera according to the present invention.
FIG. 6 is a detailed embodiment of a rewrite processing routine according to the present invention.
FIG. 7 is an example of a processing routine by the CPU 40 in the data bag 5 according to the present invention.
FIG. 8 is a processing routine example of the rewriting device 50 according to the present invention.
FIG. 9 is an example of an electric circuit diagram of a camera according to a second embodiment of the present invention.
FIG. 10 is an example of a processing routine by a CPU 28 in a camera according to a second embodiment of the present invention.
[Explanation of symbols]
1 Camera
5) Data back
8, 15, 16 terminal
28, 40 ─CPU
31 ─ Switching means
32 flash memory
50 ─ Rewriting device
60, 62 ─Comparator
61, 63 ─Reference voltage

Claims (2)

A microcomputer,
A large-capacity electrically erasable and rewritable memory storing a control program for instructing operation of the microcomputer;
A temporary storage memory for temporarily storing data,
Command and / or program data transmitted from an external device is temporarily stored in the temporary storage memory, and the command and / or program data stored in the temporary storage memory is processed by a processing instruction relating to erasure rewriting to the large capacity memory. A camera having a rewritable memory, wherein data is transferred to the mass memory. 2. The camera having a rewritable memory according to claim 1, wherein the command and / or program data is sent under control of the external device.

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