JPH06332055A - Camera - Google Patents

Abstract

PURPOSE:To easily inform a photographer of the exposure latitude information of a film loaded at present. CONSTITUTION:Display control means 1 and 3 displaying the exposure latitude information read by DX code reading means 200 and 4 on a display means 11 are provided and moreover, a switching means SW4 instructing the display of the exposure latitude information and a display control means displaying the exposure latitude information read by the DX code reading means on the display means, when the switching means is operated are provided to display the exposure latitude information on the display means (as necessary).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a camera equipped with a DX code reading means for reading the DX code of a film.

[0002]

2. Description of the Related Art In recent years, film patrones have a print display section for displaying film information (film brand, ISO [film speed], number of films) by printing, and film information (ISO information, number of films, exposure latitude area). [Latitude]) coded DX code section is provided. Therefore, in order to confirm, for example, ISO information in a state where a film is loaded in the camera, the print display section can be seen from the film presence / absence confirmation window provided on the back cover side of the camera or can be read from the DX code section. There are two ways to view an external display placed on the top surface of a camera that displays based on the DX code.

[0003]

However, of the film information, the ISO information and the number of films (specified) can be confirmed by looking at any of the displays as described above. It is not possible to know this directly with respect to the latitude (because there is nothing that displays this information on the external display, and this information is not displayed on the print display section), so it is currently loaded. If you have films of the same film brand,
I had to make a decision by looking at the DX code of it.

In recent years, many cameras have a function of changing the ISO information of the loaded film, but in this type of camera without a film presence confirmation window, it is possible to use a code other than the DX code. When the read ISO information is changed by using this function, there is no means for knowing the ISO information of the currently loaded film.

(Object of the Invention) A first object of the present invention is to provide a camera which can easily inform the photographer of the exposure latitude information of the currently loaded film.

A second object of the present invention is to always inform the original film speed information even if the film speed information read from the loaded film is changed to change the current film speed information. It is to provide a camera that can.

A third object of the present invention is to provide a camera which can inform each information of the currently loaded film when the film is automatically wound up to a predetermined position.

[0008]

According to the present invention, there is provided a display control means for displaying the exposure latitude information read by the DX code reading means on the display means, and also an instruction to display the exposure latitude information. The switch means and the display control means for displaying the exposure latitude information read by the DX code reading means on the display means when the switch means is operated are provided on the display means (if necessary). The exposure latitude information is displayed.

Further, according to the present invention, when the film sensitivity information is changed by the sensitivity changing means, a display control means for displaying at least the film sensitivity information read by the DX code reading means on the display means is provided, and the film sensitivity by the sensitivity changing means is provided. When the information is changed, the film sensitivity information read by the DX code reading means is displayed on the display means.

Further, while the film is being wound by the automatic film feeding means, a display control means for displaying all the information read by the DX code reading means on the display means is provided to reach a predetermined position by the automatic film feeding means. While the film is being wound, the display means displays each of the film sensitivity information, the film number information, and the exposure latitude area information read by the DX code reading means.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the illustrated embodiments.

FIG. 1 is a block diagram showing the main configuration of a camera according to the first embodiment of the present invention.

In FIG. 1, reference numeral 1 is a microcomputer for controlling the movement of each part of the camera.

Reference numeral 2 denotes a lens control circuit, which drives and controls a focus adjusting motor and a diaphragm blade controlling motor of a taking lens (not shown). The lens control circuit 2 performs serial communication via the data bus DBUS while receiving the LCOM signal from the microcomputer 1, receives motor drive information by this serial communication, and controls the drive of the motor based on the information. At the same time, various information (focal length, etc.) of the lens is sent to the microcomputer 1 by serial communication.

A liquid crystal display circuit 3 is provided with a liquid crystal display (to be described later) for notifying the photographer of various photographing information of the camera, such as shutter speed, aperture value, ISO information, number of films, and exposure latitude (latitude). It is a circuit for driving. The liquid crystal display circuit 3 performs serial communication via the data bus DBUS while receiving the DPCOM signal from the microcomputer 1, receives display data by this serial communication, and drives the liquid crystal display according to the data.

Reference numeral 4 denotes a switch sense circuit, which is a switch for the photographer to set various photographing conditions and a state of the switch for indicating the state of the camera, and a DX for reading a DX code provided on a film cartridge described later. This is a circuit that reads the state of the contact (contact piece) and sends it to the microcomputer 1. Then, while receiving the SWCOM signal from the microcomputer 1, the switch data is sent to the microcomputer 1 by serial communication via the data bus DBUS.

Reference numeral 5 denotes a strobe light emission dimming control circuit, which is a circuit for controlling a strobe light emission and a light emission stop function by TTL dimming. This strobe light emission control circuit 5 is
While receiving the RCOM signal, serial communication is performed with the microcomputer 1 via the data bus DBUS, and data relating to strobe control is received to perform various controls.

A focus detection circuit 6 is a unit in which a line sensor for performing AF by the existing phase difference detection method and a circuit for storing and reading the line sensor are unitized.
AF control is performed according to an instruction from the microcomputer 1.

Reference numeral 7 denotes a photometric circuit, which performs photometry of an object and sends a photometric output to the microcomputer 1 under the control of the microcomputer 1. The microcomputer 1 which receives this converts the sent photometric output from A / D and uses it for setting exposure conditions (aperture, shutter speed).

Reference numeral 8 denotes a shutter control circuit, which controls traveling of a front curtain and a rear curtain of a shutter (not shown) according to a control signal from the microcomputer 1.

Reference numeral 9 denotes a feeding circuit, which feeds (winds up, winds, or feeds the film in accordance with a control signal from the microcomputer 1.
Rewind).

SW1 is a switch for starting the photographing preparation operation of the camera. When the microcomputer 1 recognizes that the switch SW1 is turned on, it starts photometry, distance measurement and display.

SW2 is a switch for starting the photographing operation of the camera, and when the microcomputer 1 recognizes that the switch SW2 is turned on, the exposure operation is started.

The X-contact is turned on at the timing when the front curtain of the shutter has completed running, and serves to inform the strobe light emission control circuit 5 of the strobe light emission timing.

SW3 is a camera mode (Tv priority, Av
SW4 is a switch for displaying the exposure latitude area (hereinafter, referred to as latitude in the embodiments), and SW5 is for displaying the number of films (specified). SW6 is a switch for the ISO setting mode.

Reference numeral 10 denotes an electronic dial for changing the Tv value, Av value mode and the like. When the electronic dial 10 is rotated while the mode switching switch SW4 is ON, Tv priority → Av priority → manual → Program → T
The order is changed from v priority → Av priority → manual → program ... and the mode intended by the photographer can be set.
When the electronic dial 10 is rotated in the reverse direction, program → manual → Av priority → Tv priority → program → ...
And the mode is changed. When Tv priority is set as the mode by the mode switching switch SW4 and the electronic dial 10, the electronic dial 10 can be rotated to set the Tv value desired by the photographer. . Also, switch SW for mode switching
When Av priority is set as the mode by 3 and the electronic dial 10, the Av value desired by the photographer can be set by rotating the electronic dial 10.

Reference numerals 11 and 12 are liquid crystal displays driven by the liquid crystal display circuit 3, the liquid crystal display 11 is an external display arranged on the upper surface of the camera body, and the liquid crystal display 12 is a display in the viewfinder. Is.

Reference numeral 200 denotes a DX contact piece group (details will be described later) for reading a DX code, which is arranged in the film cartridge chamber of the camera, and is connected to the switch sense circuit 4.

FIG. 2 is a rear view of the camera with the back cover removed.

In FIG. 2, reference numeral 13 is a camera body, on which the liquid crystal display 11 is arranged (not shown in FIG. 2). Reference numeral 200 denotes a DX contact piece group for reading the DX code of the film shown in FIG. 1, and DX contact pieces 201 to 212 are arranged as illustrated.

FIG. 3 is a rear view of the camera showing a state in which a film (film cartridge) is loaded in the camera body 13.

In FIG. 3, reference numeral 14 denotes a film cartridge containing a film, and the DX contact piece group 200, as shown in FIG. 4, is provided on the outer peripheral portion of the film cartridge.
That is, the DX code portion 14a (conductive patterns 1 to 12) that comes into contact with the DX contact pieces 201 to 212 is provided. Then, in the state as shown in FIG. 3, the DX contact piece 201 and the conductive pattern 1 in FIG. 4, the contact piece 202 and the conductive pattern 2 ...
The contact piece 212 and the conductive pattern 12 are in contact with each other, and ON / OFF of the conductive patterns 1 to 12 is read by the switch sense circuit 4.

Further, as shown in FIG. 5, DX contact pieces 1, 7
Is a ground, and the DX contact pieces 2 to 6 form a code for detecting ISO information. Therefore, the microcomputer 1 transmits the O of the DX contacts 2 to 6 via the switch sense circuit 4.
The ISO information can be read by discriminating between N and OFF. Further, the DX contact pieces 8 to 10 form a code for detecting the number of films. Therefore, the microcomputer 1 receives the DX contact pieces 8 to 1 via the switch sense circuit 4.
By discriminating between 0 and ON, the film (standard)
The number information can be read. Also, DX contact piece 1
Reference numerals 1 and 12 form codes for detecting latitude. Therefore, the microcomputer 1 uses the switch sense circuit 4
The latitude information can be read by determining ON / OFF of the DX contact pieces 11 and 12 via the.

FIG. 6 is a view showing a display form on the liquid crystal display 11.

FIG. 6A is a diagram showing a normal display. In FIG. 6A, 601 is a Tv (shutter speed) value or I.
A 7-segment display unit that displays SO information (in this case, a display of "ISO" appears at the same time as shown in the figure), 602 is a 7-segment display unit that displays Av (aperture) value, 603
Is a battery remaining amount display portion of the camera, 604 is a film number display portion, 605 is a cartridge display portion which lights up when a film cartridge is loaded, and 606 is a bar display portion which displays an exposure correction amount and a latitude.

Next, the operation of the camera (microcomputer 1) having the above configuration will be described with reference to FIG.
It will be described in accordance with the flowchart of. [Step 701] The film cartridge 1 via the DX contact piece group 200 connected to the switch sense circuit 4.
It is determined whether or not the switch SW4 for displaying the latitude information read from No. 4 on the liquid crystal display 11 is turned on. As a result, if the switch SW4 is ON, the process proceeds to step 702 to display the read latitude information. If it is turned off, step 704 is performed to display a normal image for photographing.
Go to. [Step 702] The latitude information is displayed on the liquid crystal display 11 via the liquid crystal display circuit 3.

Here, in the latitude display, from the state of FIG. 6 (a) which is a normal display, to FIG. 6 (b) or FIG.
The display state as shown in (c) can be considered.

FIG. 6B shows the latitude information read from the DX code on the bar display section 606 which is performing the exposure correction display of FIG. 6A. Figure 6
In FIG. 6B, the exposure correction display of ± 0 steps is displayed in FIG.
Indicates that the latitude information is +2 stages rather than -1 stage.

Further, FIG. 6C shows the latitude information read from the DX code on the bar display portion 606 which is performing the exposure correction display of FIG. 6A, and turns off all other portions. It is an example in which the latitude is displayed in an easy-to-see manner. [Step 703] It is determined whether the switch SW4 is ON or OFF. As a result, if it is ON, the process returns to step 702 to continue the display of latitude information, and if it is OFF, the display of latitude information is switched to the normal display [FIG. 6 (b) or FIG. 6 (c)]. ) → FIG. 6 (a)], the process proceeds to step 704. [Step 704] The display on the liquid crystal display 11 is switched to the normal display shown in FIG.

As described above, in the first example, the film cartridge 14 is operated by operating the switch SW4.
Since the latitude information of the film read from the DX code provided on the LCD is displayed on the liquid crystal display 11, the photographer can easily know the latitude information of the current film.

Also, a bar display section 60 for displaying the exposure correction
Since 6 is also used, the width of the latitude can be confirmed in an analog manner.

(Second Embodiment) FIG. 8 is a flow chart showing the operation of the main part of the camera according to the second embodiment of the present invention. The operation will be described below with reference to FIG. Since the circuit configuration is the same as that of FIG. 1, it is omitted here.

In the second embodiment, when the photographer wants to see the number of films (specified) read from the DX code,
Normally, the number of films to be displayed is displayed on the film number display unit 604. [Step 801] The film cartridge 1 via the DX contact piece group 200 connected to the switch sense circuit 4.
It is determined whether or not the switch SW5 for displaying the information on the number of films read from 4 on the liquid crystal display 11 is turned on. As a result, if the switch SW5 is ON, the process proceeds to step 802 to display the read film number information. If it is turned off, step 804 is performed in order to display the normal shooting.
Go to. [Step 802] Information on the number of films is displayed on the liquid crystal display 11 via the liquid crystal display circuit 3.

Here, in the number of films display, from the state of FIG. 9 (a) which is a normal display, to the state of FIG. 9 (b) or FIG.
The display state as shown in (c) can be considered.

FIG. 9B shows the number-of-films information read from the DX code on the number-of-films display section 604 displaying the number of shots shown in FIG. 9A.
In FIG. 9A, it is displayed that the current number of shots is “4”, whereas in FIG. 9B it is displayed that the specified number of currently loaded films is “36”. is doing.

Further, FIG. 9C shows information on the number of films read from the DX code on the number-of-films display section 604 of FIG. 9A which indicates that the current number of shots is "4". , Is an example in which all other parts are turned off and the latitude is displayed in an easy-to-see manner. [Step 803] It is determined whether the switch SW5 is ON or OFF. As a result, if it is ON, the process returns to step 802 to continue displaying the film number information, and if it is OFF, the film number information display is switched to the normal display [FIG. 9 (b) or FIG. 9]. (C) → FIG. 9 (a)] Then, the process proceeds to step 804. [Step 804] The display on the liquid crystal display 11 is switched to the normal display shown in FIG.

As described above, in the second example, by operating the switch SW5, the film number information read from the DX code is displayed on the liquid crystal display on the film number display section 604 which normally displays the number of shots. Since the information is displayed on the container 11, the photographer can easily know the current number-of-films information.

(Third Embodiment) FIG. 10 is a diagram showing a display on a liquid crystal display 11 according to a third embodiment of the present invention.
Since the circuit configuration is the same as that of FIG. 1, it is omitted here.

The third embodiment relates to a display during the known automatic loading (automatic film winding). Conventionally, during this automatic loading, as shown in FIG. IS read from the code
Many of them displayed only O information. In the third embodiment, the ISO information read from the DX code, the number of films (specified), and the latitude information of the film are displayed during the automatic loading. This state is shown in FIG.

In the ISO change mode (switch SW
Even when the ISO information is changed, the ISO information read from the DX code can be easily known even after the ISO information is changed.

(Modification) In this embodiment, all of the ISO information, the number of films (specified), and the latitude information of the film can be displayed on the liquid crystal display 11, but at least the latitude of the film can be displayed. Good (other information is on the LCD 12 in the viewfinder)
Only). That is, only the latitude information of the film, the latitude information and the number of films information, or the latitude information and the ISO information may be displayed.

[0052]

As described above, according to the present invention,
Display control means for displaying the exposure latitude information read by the DX code reading means on the display means is provided.
Switch means for instructing the display of the exposure latitude information and display control means for displaying the exposure latitude information read by the DX code reading means on the display means when the switch means is operated, The display means is made to display the exposure latitude information (as required).

Therefore, it becomes possible to easily inform the photographer of the exposure latitude information of the currently loaded film.

Further, according to the present invention, when the film sensitivity information is changed by the sensitivity changing means, a display control means for displaying at least the film sensitivity information read by the DX code reading means on the display means is provided, and the film sensitivity by the sensitivity changing means is provided. When the information is changed, the film sensitivity information read by the DX code reading means is displayed on the display means.

Therefore, even if the film speed information read from the loaded film is changed to change the current film speed information, the original film speed information can always be notified.

Further, while the film is being wound by the automatic film feeding means, a display control means for displaying all the information read by the DX code reading means on the display means is provided to reach a predetermined position by the automatic film feeding means. While the film is being wound, the display means displays each of the film sensitivity information, the film number information, and the exposure latitude area information read by the DX code reading means.

Therefore, when the film is automatically wound up to the predetermined position, it is possible to inform each information of the film currently loaded.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main configuration of a camera according to a first embodiment of the present invention.

FIG. 2 is a rear view showing the camera according to the first embodiment of the present invention with the back cover removed.

FIG. 3 is a rear view of the camera showing a state when a film is loaded from the state of FIG.

FIG. 4 is a view showing a DX code section provided in the film cartridge of FIG.

5 is a diagram showing a relationship between each DX contact piece in the DX code part of FIG. 4 and data readable by the DX contact piece.

FIG. 6 is a diagram showing a state at the time of switching display on the liquid crystal display in the first embodiment of the present invention.

FIG. 7 is a flowchart showing an operation of a main part of the camera of the first embodiment of the present invention.

FIG. 8 is a flowchart showing the operation of the main part of the camera of the second embodiment of the present invention.

FIG. 9 is a diagram showing a state at the time of switching the display on the liquid crystal display in the second embodiment of the present invention.

FIG. 10 is a diagram showing a state at the time of switching the display on the liquid crystal display in the third embodiment of the present invention.

[Explanation of symbols]

1 Microcomputer 3 Liquid crystal display circuit 4 Switch sense circuit 11 Liquid crystal display 200 DX Contact piece group SW4 Switch for displaying film exposure latitude (latitude) SW5 Switch for displaying the number of films (specified) SW6 For ISO display of film switch

Claims (9)

[Claims] 1. A camera provided with a DX code reading means for reading film sensitivity, the number of films, and film information of an exposure latitude region from a DX code of a film, and a display means for displaying a state of the camera, wherein the DX code reading means is provided. A camera provided with display control means for displaying the exposure latitude information read by the above-mentioned means on the display means. 2. A switch means for instructing the display of the exposure latitude information is provided, and the display control means, when the switch means is operated, the exposure latitude information read by the DX code reading means, The camera according to claim 1, which is means for displaying on a display means. 3. The camera according to claim 1, wherein the display control means is means for displaying the exposure latitude information on the display means together with the film sensitivity information read by the DX code reading means. 4. The camera according to claim 1, wherein the display control means is means for displaying on the display means the exposure latitude area information together with the film number information read by the DX code reading means. 5. The display control means is means for displaying on the display means all information of the film information read by the DX code reading means.
The listed camera. 6. A DX code reading means for reading film sensitivity, the number of films, and film information of the exposure latitude region from a DX code of the film, a display means for displaying the state of the camera, and a sensitivity changing means for changing the film sensitivity information. A camera comprising: a camera including display control means for displaying at least the film sensitivity information read by the DX code reading means on the display means when the film sensitivity information is changed by the sensitivity changing means. . 7. The display control means is means for displaying the exposure latitude area information by utilizing a display section for displaying the exposure correction information in the display means. Camera. 8. A DX code reading means for reading the film sensitivity, the number of films, and film information of the exposure latitude region from the DX code of the film, a display means for displaying the state of the camera, and an automatic operation when the film is loaded in the camera. In a camera equipped with a film automatic feeding means that winds the film to a predetermined position, all the information read by the DX code reading means is read during the film winding by the film automatic feeding means. A camera provided with display control means for displaying on a display means. 9. A camera comprising a DX code reading means for reading at least film number information from a film DX code and a display means having a number display section for displaying the number of photographed images, wherein the number display section of the display means is used. Then, the camera is provided with display control means for displaying information on the number of films read by the DX code reading means.