JPH03248133A - Controller for camera - Google Patents

Abstract

PURPOSE:To surely carry out adjustment by using a part of storage means as an erroneous data detecting part and using previously prepared adjusting data when erroneous data is detected. CONSTITUTION:A CPU 1 carries out sequence control such as motor control, flush control and each kind of display control, arithmetic operations, A/D conversion and time-counting. A parity bit as the erroneous data detecting part 4a is housed in a part of E<2>PROM 4 and default data as the adjusting data is housed in another address of the E<2> PROM 4 or the ROM as a storage element in the CPU 1. Furthermore, switching data as a program switching part 4b is housed in another address of the E<2>PROM 4, and plural programs corresponding to each kind of control mode is housed in the CPU 1. Namely, the previously prepared adjusting data is used when the erroneous data is detected by the erroneous data detecting part 4a of the storage means 4. Thus, the adjustment can be surely carried out and reliability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a camera control device equipped with a storage means that can retain memory even when the power is turned off.

(Prior art) In recent years, memory means that can retain memory even when the power is turned off, such as EEPROM (E"FROM), have come to be used as adjustment elements in place of semi-fixed resistors in camera control devices. .

JP-A-58-152226 discloses a configuration in which a plurality of accessories are equipped with E2FROMs that store data of different contents, and the access address of the program software on the camera body side is changed according to the data. There is.

Japanese Patent Application Laid-open No. 62-217499 discloses that an error correction code check bit (
A configuration is shown in which data including a parity bit (Par4ty Bit) is stored, and when an error is detected, the data is corrected by a data correction circuit and output as accurate data.

(Problem to be solved by the invention) In the control based on the above-mentioned prior art E"FROM,
Compared to a semi-fixed resistor where the rough adjustment value can be seen visually, the adjustment value cannot be seen visually, and whether or not the adjustment value is included cannot be determined just by looking at it. Therefore, there is a possibility that the camera will not work at all.

Furthermore, since the E''FROM is an electrical storage element, there is a problem that data may be destroyed due to static electricity or errors may occur in writing or reading due to noise entering the serial communication line.

In addition, the CPU (central processing unit) that stores programs related to various controls of the camera is for domestic use.

Cameras for overseas use or cameras for our own brand.

Program contents are changed to accommodate OEM cameras, etc., and as a result, it is necessary to replace and increase/decrease components such as covers and switches, which increases the number of work steps and manufacturing costs. there were.

A first object of the present invention is to provide a camera control device that can reliably make adjustments even if erroneous data exists,
A second object of the present invention is to provide a camera control device in which component parts can be made more general.

(Means for Solving the Problem) In order to achieve the above first object, a camera control device has a central processing unit according to claim (1) and a storage means that can retain memory even when the power is turned off. In order to achieve the second object, a part of the storage means is used as a data error detection section, and adjustment data prepared in advance is used when detecting error data.
In the camera control device according to claim (2), which has a central processing unit and a storage means that can retain the memory even when the power is turned off, a part of the storage means is used as a program switching section, The present invention is characterized in that it is configured so that any program can be selected from a plurality of programs.

(Function) According to the means described in claim (1), a part of the storage means is used as a data error detection section, and when error data is detected, adjustment data prepared in advance in the central processing section or at a different address of the storage means is used. By using.

The adjustment can be made reliably, and according to the means recited in claim (2), a plurality of programs prepared in advance can be selected using the program switching data.

It is possible to easily adapt to the control modes required for each type of camera without replacing components such as the central processing unit.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a configuration diagram of an embodiment of the present invention, in which 1 is a CPU (central processing unit) for control, 2 is a flash unit connected to the SPC terminal of the CPUI to control charging start and stop; 3 is capacitor C and voltage dividing resistor rlt
R2 consists of ROK terminal, which is the A/D (analog/digital) conversion port of Gatsu CPUI, and the charging part is connected to the flash unit 2. 4 is connected to the CPU through serial communication and is stored even when the power is turned off. E”PROM is a recording element that holds the contents, and 5 is the CO of the CPUI.
M @ child, LCD (liquid crystal display) which is a display element that is connected to the SEG terminal and performs mode display, film count display, etc. 6 is a divided voltage level creation circuit for LCD 5 consisting of resistors r, ~ r5 .

In FIG. 1, the CPUI controls sequence controls such as motor control, flash control, and various display controls.
Performs calculations, A/D conversion, and 1-hour measurements. E2F
A parity bit (hereinafter referred to as "parity") serving as a data error detection section 4a is stored in a part of the ROM4, and the E2FROM4. Alternatively, default data is stored in advance as adjustment data in a separate address of a ROM, which is a storage element within the CPUI.

Furthermore, data for switching as the program switching section 4b is stored in another address of the E"PROM 4, and the CPU
contains multiple programs that correspond to various control modes of the camera.

Furthermore, the charging section 3 of the flash unit 2 is connected to the R of cPUl.
If the A/D conversion data of the OK terminal is equal to or higher than the charging completion level data, charging is stopped.

The operation of this embodiment will be explained with reference to the flowcharts of FIGS. 2, 3, and 4.

In Figure 2, when the power is turned on to the CPU, a reset is started, initial settings are made (Sl-1), and the E"PRO
The contents of the parity setting address of the data error detection unit 4a of M4 are read out (Sl-2). When the parity contents are correct (YES in SL-3), it is determined that the data in E"PROM4 is reliable, and the data in E"PROM4 is sent to the CPU.
The data is transferred to RAM, which is a storage element in I (Sl-4).

On the other hand, when the parity content is incorrect (No of Sl-3)
, it is determined that the data has not been adjusted or the data has been destroyed,
For example, if the data is unadjusted, E”PROM
S L
-6), or if the data is clearly incorrect,
Transfer the default data stored in the ROM of the CPUI to the RAM of the CPUI as adjustment data (
SL-5), Next, the CPU reads the contents of the program judgment address of the program switching section 4b in the E''PROM4 (5L-7), and the CPU
selects the program switching flag of the program switching section 4b (in this embodiment, the program for the domestic camera or the program for the overseas camera) is selected (S1-8);
If the camera is for domestic use, a set of domestic identification flags (S L
-9), or if the camera is for overseas use, the domestic discrimination flag is reset (S1-10), and the CPU enters an operation waiting state.

FIG. 3 is a flowchart related to flash charging control. First, before performing strobe charging, the CPU 1 sets the charging stop level to the steps (Sl-4) to (Sl-4) to (S1-4).
The transfer data of E2PR○M4 transferred to the RAM in step L-6) is set (S2-1). Next, charging in the charging section 3 is started (S2-2), and the charging partial voltage level input to the ROK terminal of the CPU 1 is A/D converted (S2-2).
-3) Check repeatedly, and when the charge level becomes equal to or higher than the charge stop level determined in the step (S2-1) (YES in S2-4), the CPU 1 stops charging in the charging unit 3. (S2-5).

By the way, in the conventional device, if a charging operation is performed in a state where no data has been written to the E"PROM 4 (final FAM) or a state where incorrect data has been written, the charge level will rise too much and the flash unit 2 will be damaged. However, in this embodiment, charging is stopped based on the adjustment data, so there is no risk of the flash unit 2 being destroyed.

In addition, by analyzing adjustment data within the production line,
The accuracy of the default data can be increased, making it possible to eliminate the need for adjustments.

Figure 4 is a flowchart related to program switching control, and this program switching is used when making minor changes to a camera to accommodate a domestic camera and an overseas camera, or a proprietary brand camera and an OEM camera. It will be done.

For example, as shown in the plan view of the display section consisting of the LCD 5 shown in FIGS. 5(a) and 5(b), the domestic camera shown in FIG. 8. Self-timer mode9. When providing continuous shooting mode 1o and multiple exposure mode 11, and also providing only night view mode 8 and self-timer mode 9 as displayed on display section 7 for the overseas camera shown in FIG. First, use the setting flag in the program switching unit 4b in step (S1-8) to select whether or not the program is for a domestic camera (S3-1), and set the domestic mode as described above (S3-1).
S3-2) or overseas mode set (S3-3
)I do.

In this way, the programs corresponding to various modes such as domestic cameras and overseas cameras can be changed using the CPU 1. LCD5
．． E2FR while using other components in common.
Since this is made possible by the program switching unit 4b of the OM4, there is no need for major replacement of component parts. Therefore, cost increases can be kept to a minimum.

(Effects of the Invention) According to the configuration described in claim (1) of the present invention, since the data error detection section of the storage means uses the adjustment data prepared in advance when detecting error data, the adjustment is reliably performed. A highly reliable camera control device can be provided, and according to the configuration described in claim (2), an arbitrary program can be selected from a plurality of programs prepared in advance by the program switching section of the storage means. It is possible to provide a versatile camera control device that can easily accommodate cameras with different modes without replacing parts.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the camera control device of the present invention, FIGS. 2, 3, and 4 are flowcharts for explaining the operation of this embodiment, and FIG. 5(a) , (b) is a plan view of the display unit.1...Central processing unit (CPU
), 2...Flash unit, 3...Charging unit, 4...Storage element (E"FROM), 4a-Data error checking unit, 4b...Program switching unit, 5.
...Liquid crystal display (LCD), 6...Partial pressure level creation circuit, 7...Display unit. 2nd ward

Claims (2)

[Claims] (1) In a camera control device that has a central processing section and a storage means that can retain memory even when the power is turned off, a part of the storage means is used as a data error detection section, and when error data is detected, a A camera control device characterized in that the camera control device is configured to use adjusted adjustment data. (2) In a camera control device that has a central processing unit and a storage unit that can retain memory even when the power is turned off, a part of the storage unit is used as a program switching unit to select from a plurality of programs prepared in advance. A camera control device characterized in that it is configured so that any program can be selected.