JP3046637U - Multi-exposure display device for camera - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To display the number of multiple exposures on the film back side on the camera body side. SOLUTION: A film back 2 having a multiple exposure function is provided.
A main CPU 11 for controlling each operation unit and a display 12 for displaying various information on a liquid crystal are provided on the camera body 1 which can be exchanged, and an ISO dial 21 for setting a film sensitivity is provided on the film back 2 side. A sub-CP that receives a release completion signal from the camera body 1 and recognizes the number of exposures
U24 and a non-volatile memory 25 for storing the number of exposures until winding is detected. The sub CPU 24 notifies the main CPU 11 of the camera body 1 of the number of exposures. Display the number of multiple exposures on the same film surface.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a multiple-exposure-number display device that displays the multiple-exposure number on a camera-side display unit in a camera that has a multiple-exposure function and has a replaceable film back.

[0002]

[Prior art]

 This type of camera can be used by changing the film used at any time according to the photographer's expressive intentions and the purpose of shooting.For example, the same scene can be shot in color and monochrome, negative and reversal, or instant film. It is possible to divide. Also, since multiple objects can be projected on the same screen, a variety of image expressions are possible, and the strict requirements of professionals and high amateurs can be met.

FIG. 7 is a block diagram showing an example of electrical information transmission means between a film back side and a camera main body side of a conventional film back replaceable camera. The camera body 101 includes a microcomputer (hereinafter, abbreviated as “CPU”) 111 including a CPU, a ROM, a RAM, and the like for controlling the entire system including the camera body 101 and the film back 102, and a calculation result thereof. And a display unit 112 for displaying.

On the other hand, the film back 102 does not have a CPU, but has an ISO dial 121 for setting a film sensitivity to be used and a setting circuit 122 therefor. The set value of the ISO dial 121 is input to the camera main body 101 via the electrical contacts 113 and 123 that come into contact when the film back 102 is mounted on the camera main body 101, and transmitted to the CPU 111 via the AD converter 114. It is displayed on the display 112. In addition, the type of the film back can be transmitted to the camera body by mechanical interlocking means interposed between the film back and the camera body.

According to such a configuration, the shutter time, the aperture value, the exposure compensation mode, the self-timer mode, the battery capacity, the photographing date, etc., which are input from the camera body, are transmitted from the film back side. The film sensitivity, the type of film back, and the like can also be displayed on the display 112, and the information necessary for general photographing is almost completely covered.

[0006]

[Problems to be solved by the invention]

 However, in such a conventional camera display device, information from the film back side is transmitted as analog information to the camera body, so the number of information that can be transmitted is limited, and some new information will be added. Then, it was necessary to change the design of the large-scale input device and add peripheral circuits.

For example, at the time of multiple exposure shooting, since information on the film surface such as the number of times of multiple exposure cannot be displayed, when the film back is replaced, the film surface of the replaced film back is not exposed, or Information such as the number of exposures is not displayed due to the multiple exposure, and the film may be automatically wound up from the camera body against the photographer's intention to continue multiple exposure, There was a risk of accidentally shooting independent scenes on multiple exposure surfaces. The present invention has been made in view of the above points, and has as its object to enable the number of times of multiple exposure of a film in a film back to be displayed on a display on a camera body.

[0008]

[Means for Solving the Problems]

 In order to achieve the above objectives, this device has a main microcomputer on the camera body that controls each operating section, a display that displays various information, and a multiple exposure mode that performs multiple exposures on the same screen of film. And a multiple exposure setting means for setting the number of exposures.

That is, a sub microcomputer for controlling the film back connected to the microcomputer when the film back is attached to the camera body, and an electrically rewriting of various data connected to the sub microcomputer when the film back is attached to the camera body. When a shutter release is performed in the camera body with the multiple exposure mode set by the multiple exposure setting means, a release completion signal is sent from the main microcomputer to the sub microcomputer of the film back. It is sent to a computer and added and stored in the non-volatile memory. The number of times of storage is read out by the sub-microcomputer, sent to the main microcomputer of the camera body, and displayed on the display, thereby displaying the number of multiple exposures on the display. It is something that was displayed is there.

[0010] In the present invention, the presence or absence of exposure of the film surface in the film back attached to the camera body and the release signal at the time of multiple exposure are recognized by the sub microcomputer and added to the non-volatile memory. It can be stored, read out, transmitted to the main microcomputer of the camera body, and displayed on the display. As a result, the main microcomputer in the camera body can check the state of the film surface when replacing the film back, and it is possible to perform overlapping shooting and winding according to the photographer's intention.

[0011]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart showing an operation of a main microcomputer on the camera body side, and FIG. 3 is a flowchart showing an operation of a sub microcomputer on a film back side. 4 to 6 are explanatory diagrams showing display examples related to multiple exposure by a display provided on the camera body.

The camera body 1 having the multiple exposure number display device according to the present invention increases the amount of information on the film back side while maintaining compatibility with the conventionally used film back, and reduces the amount of information on the camera body side. This is intended to enhance the display of the camera body by displaying the information on the display via the main microcomputer.

Referring to FIG. 1, a camera body 1 includes a CPU, a ROM, a RAM, and the like that control various parts of the camera body 1 such as film feeding, mirror operation, opening / closing an aperture, automatic exposure, auto focus, and strobe light emission. A main microcomputer (hereinafter referred to as a "main CPU") 11, a display 12 for externally displaying various kinds of information on a liquid crystal, and a release command generating means (FIG. 1) for generating a release command when a shutter button is pressed. And a multiple exposure setting means (abbreviated as "multiple exposure" in FIG. 1) such as a lever and a button for setting and releasing the multiple exposure mode.

On the other hand, the film back 2 has an ISO dial 21 for setting the film sensitivity, an input value setting circuit 22, a sub-microcomputer (hereinafter referred to as “sub CPU”) 24 for inputting the set value of the film sensitivity, A non-volatile memory (hereinafter simply referred to as “memory”) 25 and the like, which are electrically connected to the sub CPU 24 and in which various data can be electrically rewritten, are provided. The memory 25 retains the stored contents even when the film back 2 is detached from the camera body 1 and power is not supplied.

When the film back 2 is mounted on the camera body 1, the connector 23 provided on the film back 2 side is connected to the connector 13 provided on the camera body 1 side correspondingly, and the signal line and the interface circuit are provided. The sub CPU 24 and the main CPU 11 are communicably connected via the.

Next, the operation of the multiple exposure number display device having such a configuration will be described with reference to the flowcharts shown in FIGS. 2 and 3. FIG. 2 shows the operation of the main CPU on the camera body side. When this operation is started, it is first determined whether or not the number of multiple exposures stored in the memory 25 has been received from the sub CPU 24 on the film back 2 side. Judge whether it is set to.

In the case of the multiple exposure mode, the display 12 indicates that the mode is the multiple exposure mode by the first segment 12a shown in FIG. 4, and the number of times of the multiple exposure is numerically displayed by the second segment 12b. Let it. Then, the film winding member on the camera body 1 and the film winding interlocking member (both not shown) on the film back 2 are disengaged.

In actual shooting, after confirming that the multiple exposure has not been released again, the camera waits for a release command. When the release command is input, the shutter is released to perform shooting of the multiple exposure, and the shutter is released. When the operation is completed, a release completion signal is sent to the film back 2 side. Thereafter, it waits for data reception from the sub CPU 24 on the film back 2 side, and upon receiving the data of the number of multiple exposures N, causes the display 12 to display it by the segment 12b. Thereafter, the process returns to the determination of whether to cancel the multiple exposure, and the above-described processing is repeated until the multiple exposure is cancelled.

If the camera body 1 is not set to the multiple exposure mode in the first judgment of multiple exposure, the winding member of the camera body 1 is linked with the film winding interlocking member of the film back 2, If the number of multiple exposures N received from the film back side is 1 or more, the film is wound up. If the number of multiple exposures N is 0, the release command is waited for. If the release command is input, the shutter is released. Wind up the film and finish the process. When it is determined that the multiple exposure has been released, the above-described processing after the processing of the film back winding link is also executed.

On the other hand, the sub CPU 24 on the film back 2 starts the processing shown in FIG. 3, reads the number N of multiple exposures from the memory 25 when the power is turned on after being mounted on the camera body, and The main CPU 11 of the main body 1 is notified. After that, it waits for the release completion signal from the camera body 1 side, and when it receives it, adds “1” to the multiple exposure number N read from the memory 25 and stores the number in the memory 25. The main CPU 11 of the camera body 1 is notified. This process is repeated until the film is wound.

When the camera body 1 is not in the multiple exposure mode, a release completion signal is not notified from the camera body 1 side. Therefore, the film back 2 does not receive the release completion signal. The number of multiple exposures N stored in 25 is reset to “0”, N = 0 is notified to the main CPU 11 on the camera body side, and the above processing is repeated. In the single exposure mode, no display related to the multiple exposure is displayed on the display 12 of the camera body 1.

FIG. 4 shows a display 12 having a first segment 12a for displaying a multiple exposure mode on the display surface and a second segment 12b for displaying the number of multiple exposures on the same film surface. It is explanatory drawing which shows only a display. FIG. 5 shows a case where the film surface of the film back 2 attached to the camera body 1 having the display 12 as described above is an unexposed surface, and the camera body 1 is switched from the single exposure mode to the multiple exposure mode. This shows a display state, in which only the first segment 12a for displaying the multiple exposure mode is displayed, and the second segment 12b for displaying the number of multiple exposures is not displayed.

FIG. 6 shows that when the film back 2 is replaced, the first segment 12a is displayed, indicating that the camera body 1 is in the multiple exposure mode, and the second segment 12b is set to “3”. Is displayed, it is understood that the film surface of the exchanged film back 2 is a surface that has been taken three times.

According to the embodiment shown in FIG. 1, the sub-CPU 24 and the memory 25 are provided on the film back 2 side. The number of films, the number of films that can be photographed, and the like can be notified from the film back 2 to the main CPU 11 of the camera body 1 and displayed on the display 12. Further, the film counter conventionally provided on the film back side becomes unnecessary, and a mechanical counter mechanism having a complicated structure can be omitted.

Further, since the sub CPU 24 is provided on the film back 2 side, it is not necessary to control the entire system including the film back 2 by the main CPU 11 in the camera body 1. The control and the control of each part on the film back 2 side can be performed simultaneously in parallel, and the operation time can be shortened.

[0026]

[Effect of the invention]

 As described above, the multi-exposure number display device in the camera according to the present invention has the sub-CPU and the nonvolatile memory that can be connected to the main CPU of the camera main unit on the film back side, so that the display of the camera main unit is displayed. The camera can display various information on the film back side, at least whether or not the currently photographable film surface has been exposed, and if it has been exposed, the number of multiple exposures. It is possible to prevent unintended failures before they occur.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a camera body and a film back showing an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of a main CPU of the camera body.

FIG. 3 is a flowchart showing the operation of the sub CPU on the film back side.

FIG. 4 is an explanatory diagram showing a display surface of a display on the camera body side.

FIG. 5 is an explanatory view showing an example of the display contents.

FIG. 6 is an explanatory diagram showing another example of the display content.

FIG. 7 is a block diagram showing information transmission means between a camera body and a film back of a conventional camera having a multiple exposure mode and having a replaceable film back.

[Explanation of symbols]

 1: Camera body 2: Film back 11: Main microcomputer (Main CPU) 12: Display 12a: Segment for displaying multiple exposure mode 12b: Segment for displaying the number of multiple exposures 13: Connector on the camera body 14: Release command Generation means 15: Multiple exposure setting means 21: ISO dial 22: Input value setting circuit 23: Connector on film back side 24: Sub microcomputer (Sub CPU) 25: Non-volatile memory

Claims (1)

[Utility model registration claims] 1. A main microcomputer for controlling each operation unit, a display for displaying various information, and a multiple exposure setting means for setting a multiple exposure mode for performing a plurality of exposures on the same screen of a film in a camera body. A film-back replaceable camera having a multiple exposure count display device, comprising: a film-back control sub-microcomputer connected to the main microcomputer when the film-back is attached to a camera body; A nonvolatile memory connected to a sub-microcomputer and capable of electrically rewriting various data; and a shutter release is performed in the camera body in a state where a multiple exposure mode is set by multiple exposure setting means. A completion signal is sent from the main microcomputer to the film back. The number of times of multiple exposure is displayed by sending the number of times of exposure to the sub microcomputer and storing the number of times of addition in the non-volatile memory, reading out the number of times of storage by the sub microcomputer, sending the number of times to the main microcomputer and displaying the number on the display. A multiple exposure frequency display device for a camera, characterized in that: