JPH05303129A - Camera - Google Patents

Abstract

PURPOSE:To prevent graininess from being bad, and to prevent the deterioration of resolution on a print in pseudo zoom photographing in a half size by providing a means for controlling the upper limit of the trimming magnification of pseudo zoom. CONSTITUTION:A microcomputer 12 inputs half-size photographing or full-size photographing based on the condition of an F/H changeover switch 15; eliminates the upper limit of the pseudo zoom, and sets a pseudo zoom inputting circuit 6 to select X1.2, X1.4, X1.7, X2.0, when the full-size photographing is inputted. And the microcomputer 12 limits the upper limits to select only X1.2, X1.4 in terms of the pseudo zoom magnification, and sets the pseudo zoom inputting circuit when the half-size photographing is inputted. As for the value of the pseudo zoom set at the circuit 6 by turning on/off a pseudo zoom inputting switch 7; when the pseudo zoom is used, the instructing data for the pseudo zoom is prepared in order to instruct the laboratory of the pseudo zoom on a film, and when the pseudo zoom is not used, the data is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera capable of switching a photographing frame size, and more particularly to a pseudo zoom.

[0002]

2. Description of the Related Art Conventionally, in a camera system using 135 film, a camera that shoots in a full-size shooting frame of 24 mm × 36 mm and a half-size shooting frame of 24 mm × 18 mm that is half the shooting frame There are cameras that take twice as many frames.

Further, US Pat. No. 4,583,831 also proposes a concept of a pseudo zoom in which a trimming instruction is given to a film and zooming is performed at the time of printing in a laboratory (development place).

[0004]

However, in the above-described conventional example, full-size shooting /
Even if half-size shooting is loaded with a single film and it can be switched, the pseudo zoom trimming magnification is the same for each of them (the zoom effect is applied only to the viewfinder), and the pseudo zoom is performed in half size. When this is done, trimming is performed by multiplying the pseudo-zoom magnification by 1.4 times compared to the full size, resulting in the problem that the graininess of the film appears in the print and the resolution on the print decreases. It was

The present invention has been made to solve the above problems, and even in half-size pseudo zoom photographing, the photographing frame size can be switched so as to prevent deterioration of graininess and deterioration of resolution in printing. The aim is to provide a unique camera.

[0006]

In order to achieve the above object, the camera of the present invention comprises means for controlling the upper limit of the trimming magnification of the pseudo zoom according to the filming frame size of the film. ..

[0007]

According to the present invention, it is possible to prevent the deterioration of the graininess on the print and the deterioration of the resolution even in the half-size pseudo zoom photographing.

[0008]

1 to 4 show a first embodiment of the present invention,
FIG. 1 is a schematic internal configuration diagram of the camera of this embodiment, and FIG. 2 is a block diagram of the entire circuit of the camera of this embodiment. Photo reflector for feeding,
2 is a film feeding motor arranged in the spool, 3
Is a gear train for switching between deceleration, hoisting and rewinding, 4
Is a rewinding fork, F is a film coated with a magnetic layer on the base side, T is a track on which data such as exposure status, frame number, and shooting date is recorded as magnetic information, P
Is a perforation corresponding to the shooting screen, H is a magnetic head for writing and reading information to and from the track T on the film, 5 is a pressure pad for pressing the film F against the magnetic head, 11 is a battery for driving the entire system, and 12 is a whole battery. A microcomputer for controlling the drive (hereinafter abbreviated as a microcomputer), 13 is a release switch for starting a photographing operation, 14 is a feeding circuit for winding and rewinding the film, and 15 is a full size or half size shooting. An F / H switch for deciding whether to perform, 16 is a pulse detection circuit for converting the perforation signal detected by the full-size feeding photo reflector 1 into a signal compatible with the microcomputer 12, and 17 is a magnetic head H for photographing on the track T of the film F. Magnetic information writing circuit for transmitting a signal for recording information Reference numeral 18 is a magnetic reproducing circuit for reproducing / amplifying the magnetic information written on the track T of the film F as an analog signal and converting it into a digital signal for use as information for the microcomputer 12. Reference numeral 19 is a well-known photometric / ranging / shutter. AE, AF, SH circuits for opening and closing, 20 a film counter for storing and displaying the frame number of the film, 6 a pseudo-zoom input circuit, 7 a camera for wide-angle (wide) direction and telephoto (TEL) direction of pseudo-zoom It is a switch to input to, and is normally kept neutral. The pseudo zoom display may be performed by superimposing a frame in the viewfinder or zooming only the viewfinder. The pseudo zoom input circuit 6 outputs to the microcomputer 12 the pseudo zoom value set by turning on / off the pseudo zoom input switch 7. Also, the microcomputer 12 inputs the upper limit value of the pseudo zoom and sets the upper limit.

FIG. 3 is a diagram showing an operation flowchart of the microcomputer 12 of FIG. First, a film loading switch (not shown) detects whether or not the film cartridge C is loaded in the camera. If the film cartridge C is loaded, the process proceeds to S2. In S2, the first frame of the photographic film is set in the aperture (Auto-Loadin).
g) is performed. After that, from the state of the F / H switch 15, enter half size shooting or full size shooting (S
3) If it is full size shooting, go to S4, and if it is half size shooting, go to S6. For full-size shooting, see Figure 4.
As shown in FIG.
The pseudo zoom input circuit 6 is set so that 2, × 1.4, × 1.7, × 2.0 can be selected (S4). Then, the light-shielding member (not shown) is retracted from the aperture so that the aperture portion is exposed by the full size (S5).

For half-size photography, as shown in FIG. 4, the pseudo zoom input circuit 6 is set by limiting the upper limit so that the pseudo zoom magnifications of only x1.2 and x1.4 are selected. (S6). In S7, contrary to S5, a half-size image is switched by blocking half of the aperture with a light-shielding member (not shown). If the pseudo-zoom input switch 7 is turned on / off (S8) and the pseudo-zoom value set by the pseudo-zoom input circuit 6 is a pseudo-zoom, data is prepared to instruct the lab of the pseudo-zoom for the film. If there is no pseudo zoom (S9a), the pseudo zoom instruction data is erased (S9b).

Next, the on / off state of the release switch 13 is detected (S10). If the release switch 13 is off, the process returns to S3, and if it is instructed to shoot, the process proceeds to S11. Then, by the well-known AE, AF, SH circuit 19, photometry /
The shooting operation of exposure to the film surface by the distance measurement / shutter is performed (S11), and when the shooting is completed, full size / half size shooting is input from the F / H switch 15 (S12), and the feeding amount is increased. The full size of one frame or half frame is set (S13). Then, the feeding circuit 14 energizes the feeding motor 2 to start winding (S1).
4). Then, by the data writing circuit 17 and the magnetic head H, the date and S are recorded on the magnetic track T of the film F.
The data of the pseudo zoom instruction set in 9 is recorded (S
15). Next, it is determined whether or not the feeding amount of one frame set in S13 is reached (S16), and if the feeding amount of one frame is not reached, the process returns to S15, and if the feeding amount is one frame. Then, winding is stopped and magnetic writing is stopped (S17). Next, the frame is counted up (S18), and the film counter 20 stores and displays the number of frames to be photographed. Then, it is judged whether or not it is the last frame by the amount of film used or the film tension (S19). If it is not the last frame, the process returns to S3, and if it is the last frame, the feeding circuit 14 starts rewinding the film. (S20). Then, it is determined whether or not the film F is completely wound into the film cartridge C (S21), and when it is wound, the feeding motor 2 is stopped by the feeding circuit 2 (S22), and the film counter 20
Is reset and "0" is displayed (S23). afterwards,
Similar to S1, a film loading switch (not shown) determines whether the film cartridge is taken out from the camera (S24), and when the film is taken out, the process returns to S1. FIG. 5 is a diagram showing a recording system according to another embodiment of the present invention, in which 51 is an optical data transfer device composed of 7 segment LEDs, which replaces the magnetic recording of FIG. Is. FIG. 6 is a flowchart showing another embodiment of the present invention. In the figure,
The same operations as those in FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted. Unlike the pseudo-zoom input switch 7 in FIG. 3, the embodiment of FIG. 6 is a camera in which a mask member is directly attached to the finder without using the pseudo-zoom input circuit. It is assumed that the F / H switch cannot limit the situation. That is, the position of the mask member, such as a contact piece,
The microcomputer 12 detects (S61) and determines whether or not the detected value of the pseudo zoom magnification is within the upper limit (S6).
2) If it is within the upper limit, shooting is performed (S11), but if it exceeds the upper limit, a warning is given using the frame counter 20 or the like (S63), and the process returns to S10.

As described above, according to the present invention, the means for controlling the upper limit of the trimming magnification of the pseudo zoom is provided according to the switching between the full size and the half size shooting, so that the half size pseudo zoom shooting is performed. Also, it is possible to prevent deterioration of graininess and resolution on print. It is also effective for pseudo zoom in a camera that uses only the horizontal direction in the middle of a full-size frame, such as panoramic shooting.

[Brief description of drawings]

FIG. 1 is a schematic internal configuration diagram of a camera that is an embodiment of the present invention.

2 is an overall circuit block diagram of the camera of FIG.

FIG. 3 is an operation flowchart shown in FIG.

FIG. 4 is a diagram showing an example of trimming magnification of pseudo zoom.

FIG. 5 is a diagram illustrating a recording method of another embodiment of the present invention.

FIG. 6 is an operation flowchart showing another embodiment of the present invention.

[Explanation of symbols]

 1 Photo Reflector 6 Pseudo Zoom Input Switch 7 Pseudo Zoom Input Switch 12 Microcomputer F Film H Magnetic Head C Cartridge

Claims (1)

[Claims] 1. A camera capable of switching a shooting frame size, further comprising means for controlling an upper limit value of a trimming magnification of a pseudo zoom according to a shooting frame size of a film.