JPH10268388A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily confirm a subject image by correcting the subject image formed by a finder optical system and picked up by an image pickup element by a correction means based on a distance to a subject, and displaying the subject image on a display part. SOLUTION: In the case of photographing the subject, a liquid crystal display device 7 is rotated upward with a bearing as center so as to make a liquid crystal display part 7a face to a photographer side, whereby the subject image picked up by the solid-state image pickup element is displayed. The subject image is corrected based on a distance to the subject measured by a range- finding sensor and the corrected subject image is displayed on the display part 7a. As a result, parallax between a photographing optical system and the finder optical system is eliminated. Therefore, the subject image displayed on the display part 7a is nearly aligned with the subject image exposed on silver salt film through the photographing optical system and a photographer photographs the subject image composed to come up to his expectation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera provided with a finder optical system for confirming the composition of a photograph separately from a photographing optical system for photographing a subject image on a silver halide film.

[0002]

2. Description of the Related Art A conventional camera has a variable focal length optical system for photographing a subject image through a photographing lens onto a silver halide film, and a viewfinder optical system for determining the composition of a subject to be photographed on the silver halide film. System. However,
Since the optical axes of the shooting optical system and the viewfinder optical system are different from each other, there is a distance between the camera and the subject between the subject image shot on the silver halide film by the shooting optical system and the subject image viewed through the viewfinder optical system. And the parallax depending on the focal length of the photographing optical system. With such a parallax, the subject image exposed on the silver halide film is different from the subject image confirmed by looking through the finder optical system.

In order to solve the problem of parallax, in a conventional camera, an index corresponding to a distance is provided in a finder field frame, or a part of the finder field is masked based on a distance to a subject measured by a distance measuring sensor. And hid it.

[0004]

However, the above conventional example has the following problems. In other words, the indices provided in the viewfinder field frame are often difficult to see, and the photographer must determine the distance to the subject by himself. There is. In particular, when the lens barrel is movable and the focal length of the photographing optical system is variable, the judgment must be made based on both the distance to the subject and the focal length. It often happens. Further, when a part of the finder field of view is hidden using a mask, a part of the finder field of view that is being viewed may be lost, so that it may be difficult to see.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problem, and has been made to solve the problem of parallax between a photographing optical system and a finder optical system, and to form a subject image to be exposed on a silver halide film. It is an object of the present invention to provide a camera that can be easily checked by a photographer.

[0006]

A camera according to the present invention comprises:
(1) a photographing optical system for photographing a subject image on a silver halide film,
(2) a finder optical system that forms an image of a subject, (3) an image sensor that captures the subject image formed by the finder optical system, and (4) a distance measuring unit that measures a distance to the subject. (5) correction means for correcting the subject image picked up by the image sensor based on the distance measured by the distance measuring means, and eliminating parallax between the photographing optical system and the finder optical system, (6) Display means for displaying the subject image corrected by the correction means.

According to this camera, the subject image formed by the finder optical system and taken by the image pickup device is calculated based on the distance to the subject measured by the distance measuring means.
The corrected subject image is corrected by the correction means, and the corrected subject image is displayed by the display means. By doing so, the parallax between the photographing optical system and the finder optical system that occurs according to the distance to the subject is eliminated, and the subject image substantially identical to the subject image displayed by the display means is formed on the silver halide film. Exposed.

When the photographing optical system has a variable focal length, the subject image picked up by the image pickup device is further corrected by the correcting means based on the focal length of the photographing optical system. By doing so, the parallax between the photographing optical system and the finder optical system, which is generated in accordance with the distance to the subject and the focal length of the photographing optical system, is eliminated, and substantially the same as the subject image displayed by the display means. A subject image is exposed on a silver halide film.

In the case where the silver halide film has a magnetic recording area and further includes magnetic writing means for writing the distance measured by the distance measuring means into the magnetic recording area of the silver halide film, the distance measuring The distance measured by the means is written to the magnetic recording means of the silver halide film by the magnetic writing means.

In the case where the silver halide film has a magnetic recording area and further includes magnetic writing means for writing the focal length of the photographing optical system at the time of photographing in the magnetic recording area of the silver halide film, The focal length of the photographing optical system at that time is written to the magnetic recording means of the silver halide film by the magnetic writing means.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a camera according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
In the description of the drawings, the same elements will be denoted by the same reference symbols, without redundant description. Further, the present invention can be applied not only to a camera corresponding to a conventional 35 mm film, but also to a camera corresponding to a new standard film having a magnetic recording area for storing information such as shooting conditions and development conditions. Hereinafter, the latter camera will be described.

1 and 2 are a front perspective view (FIG. 1) and a rear perspective view (FIG. 2) showing the appearance of the camera 1, respectively. At the center of the front surface of the outer case 2 of the camera 1, there is provided a lens barrel outlet 3 through which a lens barrel in which a photographic lens is incorporated is extended. A flash window 4 is provided at the upper right of the lens barrel outlet 3, and a finder objective window 5 is provided on the left side of the flash window 4. The finder objective window 5 is a window for taking in a subject image captured by a solid-state imaging device via a finder optical system.

A bearing 6 is provided at the upper end of the rear surface of the outer case 2.
Are rotatably mounted. When photographing a subject, the liquid crystal display device 7 is rotated upward around the bearing 6 so that the liquid crystal display unit 7a faces the photographer (FIG. 2). In this state, the subject image picked up by the solid-state image sensor is displayed. In addition, when the photographing is not performed, the liquid crystal display device 7 is rotated downward around the bearing 6 in order to facilitate carrying the camera 1.
The liquid crystal display unit 7a can be in a state of facing the rear surface of the outer case 2.

A shutter button 8 is provided on the upper surface of the outer case 2.
Is provided. An operation panel 9 and a zoom lever 10 are provided on the rear surface of the outer case 2. The operation panel 9 includes a D key for designating a date, a PQ key for designating the number of prints, an ST key for selecting a title, a mode key for designating each mode of designation of date, a number of prints, and a title. Is provided with a CHP key for designating the size. The date specified by the D key, the number of prints specified by the PQ key, the title specified by the ST key, and
The print size set by the CHP key is recorded in the magnetic recording area at the same time that the subject image is printed on the silver halide film.

Next, a CPU for controlling the camera 1 and related components will be described with reference to FIG. In addition,
FIG. 3 shows a photographing optical system, a finder optical system, and a liquid crystal display unit 7a together with the control block of the camera 1.

The CPU 30 controls the entire camera 1. The CPU 30 includes a magnetic head controller 3.
1, a shutter control unit 32, a lens barrel control unit 33, and a film feed control unit 34 are connected. The magnetic head controller 31 controls the magnetic head 2 under the instruction of the CPU 30.
With 0, information such as the date, the number of prints and the title is written or read into the magnetic recording area of the silver halide film 21. The shutter control unit 32 controls opening and closing of the shutter 22, and the lens barrel control unit 33 controls the opening and closing of the lens barrel 23.
Is driven to change the focal length, and the film feeding control unit 34 feeds the silver halide film 21.

The CPU 30 is connected to an image pickup device readout circuit 35, a RAM 36, and a liquid crystal display control unit 37. The CPU 30 controls the image pickup device readout circuit 35, the RAM 36, and the liquid crystal display control unit 37 so that a subject image is formed. The data of the subject image is obtained and, if necessary, is operated on to display the subject image on the liquid crystal display unit 7a.

That is, under an instruction from the CPU 30, the image sensor readout circuit 35 reads an object image picked up by the solid-state image sensor (for example, CCD) 24 via the finder optical system 25, and transmits the object image data to the CPU 30. I do. The CPU 30 temporarily stores the subject image data in the RAM 36 and performs an operation on the subject image data as needed. Under the control of the CPU 30, the liquid crystal display control unit 37 displays the subject image stored in the RAM 36 or the subject image subjected to the arithmetic processing on the liquid crystal display unit 7a.

The ROM 38 stores in advance a program for control / arithmetic processing by the CPU 30 and parameters used in the control / arithmetic processing. The ROM 38 also includes an operation switch group 39 (shutter button 8, zoom lever 10 and the like) accept an operation by the user.

The photometric sensor 40 measures illuminance, and the distance measuring sensor 41 measures the distance to the subject. The control / calculation processing by the CPU 30 includes the parameters stored in the ROM 38, the operation of the operation switch group 39 by the user, the photometry sensor 40
Is performed based on the illuminance measured by the distance measurement and the distance measured by the distance measurement sensor 41.

Next, the operation of the camera 1 will be described.
In the camera 1, the subject image picked up by the solid-state imaging device 24 is corrected based on the distance to the subject measured by the distance measuring sensor 41, and the corrected subject image is displayed on the liquid crystal display unit 7a. You. Hereinafter, an operation flow of the camera 1 when the shutter button 8 is pressed will be described with reference to FIGS.

FIG. 4 is a flowchart of a photographing process performed after the shutter button 8 is pressed. FIG.
FIG. 5A is an explanatory diagram of a subject image displayed on the liquid crystal display unit 7a at the time of the photographing process. FIG. 5A shows a subject image to be exposed to the silver halide film 21 via the photographing optical system.
(B) shows the state of the solid-state imaging device 2 through the finder optical system 25;
4 shows the uncorrected image of the subject taken in FIG.
Indicates corrected subject images displayed on the liquid crystal display unit 7a.

In this photographing process, first, the CPU 30
Receives the illuminance data measured by the photometry sensor 40 in step S1, and receives the distance data to the subject measured by the distance measurement sensor 41 in step S2.

Subsequently, in step S3, the CPU 30
Corrects the subject image (FIG. 5B) captured by the solid-state imaging device 24 based on the distance data measured in step S2 and the focal length of the photographing optical system. The subject image to be subjected to this correction operation is imaged by the solid-state image sensor 24 via the finder optical system 25 immediately before the start of the interrupt processing, read by the image sensor read circuit 35, and temporarily stored in the RAM 36. Is what it is. Further, the focal length of the photographing optical system is obtained from the position of the lens barrel 23 which has been previously extended and driven by the lens barrel control unit 33 at the start of the interruption processing.

At the time of this correction calculation, the CPU 30 reads out the correspondence between the distance to the subject and the focal length of the photographing optical system and the correction amount from the ROM 38, and determines the correction amount with reference to this correspondence. Alternatively, the CPU 30
The correction amount may be obtained by calculation according to a relational expression using the distance to the subject and the focal length of the photographing optical system as input variables.

The focal length of the finder optical system 25 is linked to the movement of the lens barrel 23, and the finder optical system 25
Is imaged by the solid-state image sensor 24 through the liquid crystal display unit 7a
If the object image displayed in the step S3 has substantially the same angle of view as the object image to be exposed to the silver halide film 21 via the photographing optical system 23, the correction in the correction calculation in step S3 is performed by solid-state imaging. The object image captured by the element 24 is translated. On the other hand, when the lens barrel 23 moves but the finder optical system 25 is fixed,
The correction in the correction calculation in step S3 is to translate and enlarge / reduce the subject image captured by the solid-state imaging device 24. If both the lens barrel 23 and the finder optical system 25 are fixed, the correction calculation in step S3 is performed based on only the distance to the subject. Is translated.

When step S3 ends, the process proceeds to step S4. In step S4, the CPU 30 displays the subject image corrected in step S3 on the liquid crystal display controller 37.
Is displayed on the liquid crystal display unit 7a via the. At this time, the subject image (FIG. 5C) displayed on the liquid crystal display unit 7a is the subject image to be exposed to the silver halide film 21 (FIG. 5A).
And almost match. Therefore, the photographer can see the subject image displayed on the liquid crystal display unit 7a and confirm the composition of the photographing. In a succeeding step S5, the CPU 30
Adjusts the focus of the photographing optical system in the lens barrel 23 in accordance with the distance to the subject measured by the distance measurement sensor 41 in step S2.

When step S5 is completed, the process proceeds to step S6. In step S6, the CPU 30 determines whether or not the shutter button 8 has been fully pressed. If it is determined that the shutter button 8 has not been fully pressed, the process proceeds to step S7; otherwise, the process proceeds to step S8.
In step S7, the CPU 30 determines whether the shutter button 8 is half-pressed. If it is determined that the shutter button 8 is half-pressed, the process returns to step S6; otherwise, the interrupt process ends.
That is, as long as the shutter button 8 is half-pressed,
If the shutter button 8 is fully pressed, the process proceeds to step S8. If the shutter button 8 is not pressed, the interrupt process ends.

Then, in step S8, the CPU 30
Sets the aperture value and the shutter time appropriately based on the illuminance data measured in step S1 and the sensitivity of the silver halide film 21, and sets the shutter 2 through the shutter control unit 32.
2 is opened and the silver halide film 21 is exposed. When the silver halide film 21 is a new standard film also having a magnetic recording area capable of storing information on photographing conditions, development conditions, and the like, the CPU 30 sets the date and number of prints set and selected, and Not only the information such as the title but also the distance to the subject and the focal length of the photographing optical system are written in the magnetic recording area of the silver halide film 21 via the magnetic head control unit 31 and the magnetic head 20 which are magnetic writing means. . When the shooting process is completed as described above,
The CPU 30 instructs the film feeding control unit 34 to feed the silver halide film 21.

Note that, in the flow described with reference to FIG.
The subject image stored in M36 was used for correction calculation and display without being updated during the interrupt processing. But,
The position of the imaging step by the solid-state imaging device 24 is not limited to this, and may be set after the start of the interrupt processing.

The imaging step by the solid-state imaging device 24, and the correction step S3 and the display step S4 of the object image captured thereby are before the step S6 and the branch from the step S7 arrives in this order. May be placed later. In this case, the subject image is continually picked up by the solid-state image pickup device 24 and read out by the image pickup device readout circuit 35, and is corrected and calculated based on the distance to the subject and the focal length of the photographic optical system. The subject image is displayed on the liquid crystal display unit 7a. Therefore, it is suitable for photographing a moving subject.

As described above, based on the distance to the subject measured by the distance measuring sensor 40 and the focal length of the photographing optical system, the solid-state image pickup device 2 passes through the finder optical system 25.
4 is corrected by the imaging device readout circuit 35 and is displayed on the liquid crystal display unit 7a via the liquid crystal display control unit 37. Therefore, the photographing optical system 23 and the finder optical system The parallax between 25 and 25 is eliminated. Therefore, the subject image displayed on the liquid crystal display unit 7a substantially matches the subject image captured on the silver halide film 21 via the photographing optical system 23, and the photographer captures a subject image having the composition expected by the photographer. be able to.

[0033]

As described above in detail, according to the present invention, the subject image formed by the finder optical system and taken by the image pickup device is transferred to the subject measured by the distance measuring means (distance measuring sensor). Correction means (C
PU), and the corrected subject image is displayed by the display means. By doing so, the parallax between the photographing optical system and the finder optical system that occurs according to the distance to the subject is eliminated, and the subject image substantially identical to the subject image displayed by the display means is formed on the silver halide film. Exposed. Therefore, the photographer can easily photograph the subject image having the composition as expected.

When the photographing optical system has a variable focal length, the subject image picked up by the image pickup device is further corrected by the correcting means based on the focal length of the photographing optical system. By doing so, the parallax between the photographing optical system and the finder optical system, which is generated in accordance with the distance to the subject and the focal length of the photographing optical system, is eliminated, and substantially the same as the subject image displayed by the display means. Since the subject image is exposed to the silver halide film, the photographer can easily photograph the subject image in the composition expected by the photographer also in this case.

The silver halide film has a magnetic recording area and magnetic writing means (magnetic head control means, magnetic head) for writing information in the magnetic recording area.
In the case of further comprising, the distance measured by the distance measuring means and the focal length of the photographing optical system at the time of photographing are written into the magnetic recording means of the silver halide film by the magnetic writing means, and are referred to at the time of development and printing. I can do it.

[Brief description of the drawings]

FIG. 1 is a front perspective view showing the appearance of a camera according to an embodiment of the present invention.

FIG. 2 is a rear perspective view showing the appearance of the camera according to the embodiment of the present invention.

FIG. 3 is an explanatory diagram of a control block, a photographing optical system, a finder optical system, and a liquid crystal display unit of the camera according to the embodiment of the present invention.

FIG. 4 is a flowchart of a photographing process.

FIG. 5 is an explanatory diagram of a subject image displayed on a liquid crystal display unit in a photographing process.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Camera, 2 ... Outer case, 3 ... Lens barrel exit, 4 ... Strobe window, 5 ... Finder objective window, 6 ... Bearing, 7 ... Liquid crystal display, 7a ... Liquid crystal display, 8 ... Shutter button, 9
... operation panel, 10 ... zoom lever, 20 ... magnetic head, 21 ... silver halide film, 22 ... shutter, 23 ... lens barrel, 24 ... solid-state imaging device, 25 ... finder optical system.

Claims (6)

[Claims] A photographing optical system for photographing a subject image on a silver halide film; a finder optical system for forming the subject image; and an image sensor for photographing the subject image formed by the finder optical system. A distance measuring unit that measures a distance to the subject; and correcting the subject image captured by the imaging device based on the distance measured by the distance measuring unit, so that the photographing optical system and the finder optical system are corrected. A camera comprising: a correction unit configured to eliminate parallax with a system; and a display unit configured to display the subject image corrected by the correction unit. 2. The photographing optical system has a variable focal length, and the correction unit further corrects the subject image taken by the image pickup device based on a focal length of the photographing optical system. The camera according to claim 1, wherein: 3. The camera according to claim 1, wherein the silver halide film has a magnetic storage area. 4. The camera according to claim 3, further comprising magnetic writing means for writing the distance measured by said distance measuring means in a magnetic recording area of said silver halide film. 5. The camera according to claim 2, wherein the silver halide film has a magnetic storage area. 6. The camera according to claim 5, further comprising magnetic writing means for writing a focal length of the photographing optical system at the time of photographing to a magnetic recording area of the silver halide film.