JPH035742A - Camera that can take pictures using electronic zoom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to an electronic zoom camera that exposes only an area on a film corresponding to a set trimming magnification of 5.

B. Prior art As this type of camera, for example, Japanese Patent Application Laid-Open No. 64-23244
The one disclosed in the publication No. 1 is known. This camera stores multiple types of trimming magnifications in advance that correspond to the enlargement magnification during printing, and when one of the cropping magnifications is selected and set by operating the operating member, the aperture is shielded by a predetermined amount by the shielding plate, and the aperture is shielded by a predetermined amount. A photographing aperture is formed according to the trimming magnification. Thereafter, when a release operation is performed, only the subject image in an area corresponding to the trimming magnification is exposed on the film surface by the photographing aperture formed.

Film exposed with such a camera is printed with the same size for all frames, but the size of the exposed area differs depending on the cropping magnification set.
The enlargement magnification is also different. Therefore, even if the photographing lens is a single focal length lens with a constant focal length, photographs corresponding to a plurality of focal lengths can be obtained, as in the case where a multifocal lens is used.

This method of setting a desired trimming magnification for photographing is called electronic zoom.

By the way, when a plurality of frames are exposed by varying the trimming magnification as described above, the size of the subject image exposed on the film surface differs depending on the frame. Therefore, in order to prevent film waste, for example, as shown in Figure 3,
A camera has been proposed that performs exposure after correcting the position of the film so that the exposure areas 51 on the film surface are all adjacent to each other at a predetermined interval a regardless of the above-mentioned trimming magnification.

C6 Problem to be Solved by the Invention However, since the size of the exposure area 51 is not constant, in a camera that corrects the film position as described above, the exposure position of any frame on the film surface is not constant, and therefore When displaying only the number of exposed frames as in the case of the camera, it was inconvenient to not know the remaining number of exposed frames.

A technical problem of the present invention is to make it possible to know the remaining number of frames that can be exposed even when the exposure position of any frame is not constant.

00 Means for Solving the Problems To explain with reference to FIG. 1, which is a diagram corresponding to claims, the present invention includes a setting means 101 that selects and sets a predetermined trimming magnification from a plurality of trimming magnifications that can be set in advance.
and a photographing aperture forming means 102 for forming a photographing aperture according to a set trimming magnification, and a photographing aperture forming means 102 for forming a photographing aperture according to a set trimming magnification, and a photographing aperture forming means 102 for forming a photographing aperture according to a set trimming magnification, so that the subject images of each frame exposed on the film surface are adjacent to each other at a predetermined interval regardless of the size of the photographing aperture. Driving means 10 for driving the film
The present invention is applied to a camera that is equipped with 3 and is capable of photographing using electronic zoom. Then, the length of the unexposed part of the film is calculated based on the total length of the exposed part of the film, the number of exposed frames, and the trimming magnification at which each exposed frame was exposed, and the length of the unexposed part of the film is calculated. Calculating means 104 for calculating the remaining number of exposed frames from the length of the portion;
Display means 10 for displaying the calculated remaining exposure possible number of frames
5, thereby solving the above technical problem.

The E0 action calculation means 104 calculates the length of the unexposed part of the film based on the total length of the exposed part of the film, the number of exposed frames, and at which trimming magnification each exposed frame was exposed. , the remaining number of exposed frames is calculated from the length of this unexposed portion. The display means 105 displays the remaining number of exposure possible frames calculated by the calculation means 104.

F. Example An embodiment of the present invention will be described with reference to FIGS. 2 to 5.

In FIG. 2 showing the overall configuration, the CPU includes a magnification setting circuit 2 and a motor drive circuit 4 for the film winding motor 3.
and a liquid crystal display device 5 provided on the surface of the camera body. A manual switch SWI is connected to the magnification setting circuit 2, and a plurality of settable trimming magnifications are stored in advance.

The trimming magnification corresponds to the enlargement magnification during printing, and the value obtained by multiplying this trimming magnification by the focal length of the photographic lens becomes the focal length equivalent value. That is,
When the focal length of the photographic lens is 35mm and the cropping magnification is "2".

The focal length equivalent value is 70, and a photograph of the screen similar to that obtained when exposure is performed with a photographic lens having a focal length of 70 mm is obtained. Further, when the trimming magnification is "1", a screen corresponding to the focal length of the photographing lens is obtained.

The magnification setting circuit 2 sequentially sets a larger trimming magnification each time the switch SWI is operated to the T side shown in the figure, and sequentially sets a larger trimming magnification each time the switch SW1 is operated to the W side shown in the figure. Set a small cropping magnification. Then, a magnification signal corresponding to the set trimming magnification is input to the CPU1.

Here, in the camera of this embodiment, as the switch SW1 is operated, a screen corresponding to the trimming magnification set by the magnification setting circuit 2 is formed in the viewfinder.
Therefore, the photographer can set a desired cropping magnification while viewing the subject through this finder.

The motor drive circuit 4 controls the motor 3 after the exposure of an arbitrary frame is completed.
The film is wound up by one frame, and when all the frames have been exposed, the film is rewound. Further, the position of the film is corrected in accordance with the above-mentioned trimming magnification as will be described in detail later. The liquid crystal display device 5 displays the number of remaining exposure frames of the film in response to a display signal from the CPUI.

The CPU also includes a shielding plate drive circuit 6 and a DX contact 7.
is connected. Here, the camera of this embodiment is provided with a shielding plate (not shown) that can be inserted immediately before or after the aperture, as disclosed in, for example, Japanese Patent Laid-Open No. 64-23244. A predetermined photographing aperture is formed by shielding the aperture from the top, bottom, left and right. The shielding plate drive circuit 6 forms an imaging aperture according to the set trimming magnification by driving the shielding plate in response to a command from the CPU. As a result, only the subject image in the area corresponding to the set trimming magnification is exposed on the film FI. That is, as shown in Figure 3,
The size of the exposure area 51 differs depending on the trimming magnification. Note that when the trimming magnification is "1", the aperture is not shielded by the shielding plate, and the size of the exposure area 51 becomes the standard size.

The DX contact 7 is exposed in the cartridge chamber of the camera body, and when the cartridge is loaded in the cartridge chamber, the DX contact
It is designed to make contact with the code, which inputs film information into the CPUI. This film information includes, for example, the film sensitivity and the total number of frames that can be exposed.

Next, the control procedure by the CPU 1 will be explained based on the flowchart in FIG.

Load the cartridge into the camera and turn on the power switch to start this program. First, in step S1, film information is read from the DX code of the cartridge via the DX contact 7, and then in step S2, it is determined whether a DX error has occurred. This DX error is, for example, D
This indicates that the X code is damaged and the film information cannot be read. In this case, in step S16, the above-mentioned liquid crystal display device 5 displays a message indicating that an error has occurred, and the process is terminated.

If no error has occurred, the process advances to step S3.

The film is fed by a predetermined amount by the motor 3 via the motor drive circuit 4, thereby making it ready for exposure.

Thereafter, the process proceeds to step S4, where a display signal is output to the liquid crystal display device 5 to display the number of frames that can be exposed, and step S4 is performed.
Proceed to step 5. In this case, the number of pieces has a trimming ratio of "1"
, that is, the number of frames for standard-sized frames without electronic zooming.For example, if the film is a 24-shot film, "24" is displayed.

In step S5, whether or not the above-mentioned magnification equal sign is output from the magnification setting circuit 2, that is, whether the switch SWI
It is determined whether or not an operation for changing the trimming magnification has been performed by the operation. If negative, the process proceeds to step S10, and if affirmative, the process proceeds to step S6. In step S6, the shielding plate is driven via the shielding plate drive circuit 6 to form a photographing aperture according to the input magnification signal, and the process proceeds to step S7.

In step S7, as shown in FIG. 3, the exposure areas 51 on the film FI are arranged so that they are adjacent to each other at a predetermined interval a regardless of the set trimming magnification, that is, the size of the photographing aperture formed in step S6. The film position is corrected by the motor 3 via the motor drive circuit 4. The film drive amount and drive direction at this time are determined by the trimming magnification at the previous exposure and the current trimming magnification. Therefore, in this step S7, the film FI may be rewound, or may be rewound. be.

Next, in step S8, it is calculated how many more frames can be photographed with the currently set trimming magnification. That is, first, the total length of the exposed part (excluding the color feed part at the leading edge of the film FI) is calculated from the total number of exposed frames of the film FI inputted via the DX contact, and the total length of this exposed part and the exposed number are calculated. The length of the unexposed portion of the film FI is calculated based on the number of frames and the trimming magnification at which each exposed frame was exposed. Then, from the length of this unexposed portion, the remaining number of exposed frames for the currently set trimming magnification is calculated, and the process proceeds to step S9. In step S9, a display signal is output, the calculated remaining number of exposure possible frames is displayed on the liquid crystal display device 5, and the process proceeds to step S10.

In step S10, it is determined whether or not a release button (not shown) has been turned on. If negative, the process returns to step S5; if affirmative, the shutter (not shown) is driven in step Sll to expose the film Fl. Proceed to step S12.

In step S12, it is determined whether the remaining number of exposed frames calculated in step S8 is zero, and if it is zero, the film FI is rewound in step S15 and the process is terminated.

If the remaining number of exposure possible frames is other than zero, step S13
At step S, wind the film FI by one frame with the frame size corresponding to the trimming magnification set above.
In step SL4, which proceeds to step 14, the remaining number of exposure possible frames is calculated using the calculation method shown in step s8, and the process returns to step s4.

Note that although the above-described program ends when the power switch is turned off, the number of exposed frames and the trimming magnification during exposure remain in the memory of the CPUI.

According to the above procedure, each time the switch SWI is operated, the trimming magnification is changed and set, and the remaining number of frames that can be exposed for the set trimming magnification, that is, how many frames can be exposed with this trimming magnification is determined. Each time it is displayed on the liquid crystal display device 5.

Further, as the trimming magnification is changed, the shielding plate is driven to form a photographing aperture corresponding to the trimming magnification, and the position of the film FI is corrected as described above.

Therefore, the interval between each frame is the predetermined value a, regardless of the size of the photographing aperture at the time of exposure of each frame. Here, FIG. 5 shows the exposure area 61 when the film is always wound at a standard size and film FI correction is not performed. In this case, the spacing between each frame is not constant, and the film Fl is wasted. arise. Note that C indicates the standard size frame interval.

In the configuration of the above embodiment, the magnification setting circuit 2 operates the setting means 101, the CPU 1 and the shielding plate drive circuit 6 operate the photographing aperture setting means 102, the CPU 1, the motor drive circuit 4 and the motor 3 operate the drive means 103, and the CPU Arithmetic means 1
04 and the liquid crystal display device 5 constitute display means 105, respectively.

The above description is based on the operation of switch SWI.

Although the remaining number of exposure possible frames is displayed according to the set trimming magnification, for example, the remaining number of exposure possible frames according to all trimming magnifications may be displayed at the same time. Alternatively, only the number of frames that can be exposed for standard size frames when electronic zoom is not performed may be displayed.

G6 Effects of the Invention According to the present invention, in a camera in which the subject images of each frame are adjacent to each other at a predetermined interval regardless of the cropping magnification,
Since the remaining number of exposureable frames is calculated and displayed, even if the exposure position of any frame is not constant, the remaining number of exposureable frames can be known, which is convenient.

[Brief explanation of drawings]

FIG. 1 is a complaint correspondence diagram. 2 to 5 show an embodiment of the present invention, FIG. 2 is a block diagram showing the control system of the camera according to the invention, and FIGS. 3 and 5 are front views of the film showing the exposure state. , FIG. 4 is a flowchart of the processing procedure.

Claims (1)

[Scope of Claims] Setting means for selecting and setting a predetermined trimming magnification from a plurality of trimming magnifications that can be set in advance; and photographing aperture forming means for forming a photographing aperture according to the set trimming magnification. , a driving means for driving the film so that the subject images of each frame to be exposed on the film surface are adjacent to each other at a predetermined interval regardless of the size of the photographing aperture, the total length of the exposed portion of the film; , calculates the length of the unexposed part of the film based on the number of exposed frames and the trimming ratio at which each exposed frame was exposed, and calculates the remaining exposure possible from the length of this unexposed part. 1. A camera capable of photographing using electronic zoom, comprising: a calculation means for calculating the number of frames; and a display means for displaying the calculated remaining number of exposureable frames.