JPH0222633A - Flash photographing switching device - Google Patents

Abstract

PURPOSE:To automatically select an LS mode to prevent photographing error by providing a switching means, which sets a lens shutter mode or a focal plain shutter mode, and a sequence control means. CONSTITUTION:The device has the switching means to set the lens shutter mode or the focal plain shutter mode. Further, the device is equipped with a first driving means D1, which controls a program exposure value and/or a stop value of a lens shutter 8, a second driving means D2, which controls the operating time of a focal plain shutter 11, the sequence control means SC, which controls the operating timing of the two driving means, a setting means 16, which selects and sets automatic exposure by natural light or automatic exposure by flash, and a forcible switching means 107, which sets a lens shutter mode regardless of the setting of the switching means when the setting means is set to the automatic exposure by flash. Thus the characteristics of the two shutters can be effectively utilized according to the photographing purpose.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a camera equipped with a lens shutter and a focal plane shutter.

(Prior art and its problems) A camera (hereinafter referred to as LS) equipped with a lens shutter (hereinafter referred to as LS)
(hereinafter referred to as LS camera) and a camera (hereinafter referred to as FPS) equipped with a focal plane shutter (hereinafter referred to as FPS)
F, PS camera) are all known.

LS cameras are effective for flash photography because of the characteristics of the shutter aperture, while FPS cameras allow for lens exchange due to the light-blocking mode, and high-speed time control is possible due to the operating mode.

In order to take advantage of the features of the above two types of cameras, an interchangeable lens of the type that includes an independently operating LS within the interchangeable lens of an FPS camera has been proposed.

However, since this is a shutter that operates independently as an interchangeable lens, and control sections are provided separately for the FPS and LS, there are many unnecessary parts.

In order to solve the above problem, the same applicant has developed LS and FPS.
We have already proposed a camera system equipped with (Patent Application No. 1983) However, there are still problems that need to be solved for a camera that fully utilizes LS, which is effective for flash photography.

(Objective of the Invention) The present invention has been made in view of the above-mentioned problems, and is equipped with LS and FPS, and automatically selects the LS mode for subjects for which flash photography is performed, thereby preventing mistakes in photography. The purpose is to provide a camera that prevents.

(Means for achieving the object) According to the present invention, in a camera equipped with a lens shutter and a focal plane shutter that perform program exposure operation and aperture adjustment operation, a lens shutter mode in which the lens shutter operates as a program shutter;
a switching means for setting a focal plane shutter mode in which the focal plane shutter controls a shutter speed and the lens shutter controls an aperture; and a first driving means for controlling a programmed exposure value and/or an aperture value of the lens shutter. , a twenty-first! that controls the operating time of the focal plane shutter! a sequence control means for controlling the operation timing of the two drive means, a setting means for selecting and setting automatic exposure using natural light and automatic exposure using flash, and said setting means setting automatic exposure using flash. The above object is achieved by a flash photography switching device comprising a forced switching means for setting the lens shutter mode irrespective of the setting of the switching means when the lens shutter mode is set.

(Configuration) To explain in detail with reference to the drawings showing an embodiment of the present invention, in FIG. 1, a camera body 1 includes a photographing lens 2,
is supported and attached to the lens barrel 3. The subject image that has passed through the lens 2 forms on a photosensitive material F (hereinafter referred to as film) that is stored behind the area limited by the photographic screen 4.

The top of the camera body is equipped with a finder 5 having a field of view frame, and a light-shielding tube 6 that blocks harmful light from entering the film from parts other than the photographic lens, and the top of the camera is equipped with a release button 7 for operating the camera. .

A lens shutter (LS) 8 is provided behind the photographic lens 2 to open and close the lens aperture, and the lens aperture is normally closed by a shutter blade 8a.

The step motor 9 is arranged in the mirror wq3, and opens and closes a shutter blade 8a, which also serves as an aperture, in response to an output signal from the first driving means DI.

The electronic circuit 10 that controls the step motor 9 includes a first drive means D1, a sequence control means SC that controls the timing of shutter operation, a photometer @ path including a light receiving element that measures the subject brightness, and a second drive means described below. It consists of driving means, etc.

The focal plane shutter (FPS) 11 has a structure in which a front curtain 13 and a rear curtain 14 are supported on a substrate 12 attached to the camera body 1. Two electromagnets (not shown) are driven by a second driving means D2 of an electronic circuit 10. When activated sequentially, the exposure time is controlled by operating at desired time intervals.

The FPS II is charged by a known method when the film is being fed, and when performing multiple exposure operation, it is charged separately from the film feeding.

A switching means 5 is provided on the top of the camera to select whether photography is to be performed by FPSII or LS8.

Further, a setting means 16 for selecting and setting automatic exposure using natural light and automatic exposure using flash light is similarly provided at the top of the camera.

FIG. 2 is a block diagram showing the operating system of the above configuration.

The calculation means 105 includes a photometry circuit 101 including a light receiving element for measuring the brightness of the subject, a distance R measurement circuit 102 for measuring the distance to the subject, a means 20 for setting the focal length Mf of the photographic lens 2, and a film sensitivity. Setting means 10
4, etc. as input, and outputs the signal to switching means 15 and sequence control means SC, which will be described later.

The switching means 15 selects whether to perform program exposure operation using LS or to perform exposure time control operation using FPS. In other words, if you press the protruding part on the top of the camera once,
It sets the lens shutter mode in which LS is activated, and when pressed again, it is set in the focal plane shutter mode in which FPS is activated.The next time it is pressed, it returns to lens shutter mode.

Even if the setting means 16 is set to the position of automatic exposure using natural light, when the output Ql of the calculation means 105 indicates that the subject is in a situation where automatic exposure using natural light is no longer possible, the forced switching means lO7 Forced to lens shutter mode.

Further, the output Q2 of the calculation means 105 outputs a signal corresponding to each mode to the sequence control means SC in order to set the exposure level according to the brightness of the subject.

The mode display means 106 displays which of the above setting modes is set, and when the lens shutter mode is forcibly set, displays the display by blinking repeatedly.

Based on the signal from the switching means 15 or the forced switching means 107, the sequence control circuit SC controls the first driving means DI and the second driving means DI.
, the FPSII and the LS8 are operated at timings in which the order of operation with the ejecting means D2 is set in advance.

Next, the method of operation will be explained with reference to FIGS. 3 to 5. In FIGS. 4 and 5, the horizontal axis shows elapsed time, and the vertical axis shows the exposure amount or screen position on the photographing screen 4.

In the operation flowchart of FIG. 3, step #1 shows a state in which the release button 7 of the camera is pressed down and the entire camera device is energized from the power source (1!I not shown).

Hereinafter, step by step explanation will be given. In step #2, information Sv from the film sensitivity setting means 104 is inputted in step #2.
In step #3, the information BV from the photometry circuit 101 and in step #4, the information DV from the distance measuring circuit 102 are input to the calculation circuit 105, and calculation is performed in step #5. In step #6, the information GV from the flash device 17, the information Zv from the focal length setting means 104, and the above-mentioned information DV are manually operated in the arithmetic circuit 105, and then the operation in step #7 is performed.

In step #8, the setting means 16 sets the flash device 1
It is determined whether or not the strobe mode using 7 is set, and if it is set to be photographed in natural light, the process proceeds to step #9.

In step #9, based on the above calculation result, it is determined whether or not the flash device 17 should automatically emit light, and if the flash device 17 does not need to emit light, it is determined in step #1 according to the setting mode of the switching means 15.
0, and automatic exposure operation using natural light is performed.

If it is determined in step #9 that automatic light emission is required, the process moves to step #11 and it is determined whether the switching means 15 is set to the LS mode. If the LS mode is set, steps #12, #13, #14
The exposure operation is performed in the sequence shown in FIG. Note that the flash device 17 emits light using a known method based on the LS signal.

On the other hand, if the FPS mode is set in step #11, the process moves to step #15, where it is determined whether the shutter speed at which FPS II should operate is shorter than the time required to synchronize the entire screen to the light emission of the flash device. Step #1
Perform the operations from 2 onwards, and if it takes longer, move on to step #16,
Therefore, it is determined whether camera shake will occur during shooting at the shutter speed that FPS 11 should operate at, and if camera shake occurs, the process moves to step #12 and the subsequent L
S operation is performed. If there is no risk of camera shake, proceed to step #17 and follow the sequence shown in Figure 6.
First, the LS8 calculates a predetermined aperture diameter d by the calculating means 106.
Set l. Next, in step #19, FPSII
When the first curtain 13 of 2018 begins, the flash is installed at step #20.
17 is caused to emit light, and furthermore, in step #21, the rear curtain 14 is moved to complete the exposure.

Further, if the setting means I6 is set to the strobe mode using the flash device 17 in step #8, the process advances to step #ll, and thereafter, in the same manner as described above, step #1
Judgments are made in steps 1, #15, and #16, and if the situation is such that LS8 should be activated, the process moves to step #12, and if the situation is that FPSII should be used, the process moves to step #18, and LS8 or FPSII is activated in the same way as above. .

FIG. 4 is an operation diagram when the switching means 15 is set to the lens shutter mode in which the exposure operation is performed by the LS8. When the release button 7 in FIG. 1 is pressed during photographing, the sequence control means SC first releases the second! ! ! Specify the function D2 to output the signal, and the first curtain 13 of FPSII
is operated from one end P1 of the screen to the other end P2 to open the photographing screen 4.Next, the sequence control means SC specifies the first drive means DI to output a signal, and opens and closes the LS8 to open and close the area. Film F is exposed with a light amount corresponding to Q1. At this time, the LS8 performs a program exposure operation that combines aperture and time depending on the brightness of the subject.

Subsequently, the sequence control means SC controls the second drive means D2.
Specify and output the signal, and the rear curtain 14 of FPSII -
# Operate from Pl to the other end P2 to close the photographing screen 4.

When FPSII finishes operating, the sequence control means SC
outputs a signal to wind the film F to a new number of frames, and also operates a motor (not shown) to charge the FPS II.

Through the above operations, photographing in lens shutter mode is completed.

FIG. 5 is an operation diagram when the switching means 15 is set to the focal plane shutter mode in which exposure is performed using FPSII.

When the release button 7 in Fig. 1 is pressed during shooting,
The sequence control means SC first specifies the first drive means D1 to output a signal, opens the LS8 to a predetermined aperture value di, and closes the lens frontage.

Next, the sequence control means SC designates the second drive means D2 to output a signal, and sequentially operates the front curtain 13 and the rear curtain 14 of the FPSII to expose the film F. At this time,
The front curtain 13 and the rear curtain 14 operate at a time interval t that provides an appropriate amount of exposure in combination with the aperture value d1 of the LS8, depending on the brightness of the subject.

Subsequently, the sequence control means SC controls the first drive means DI.
is specified to output a signal and close LS8.

When LS8 completes its operation, the sequence control means SC:
It outputs a signal to wind the film F to a new number of frames, and also operates a motor (not shown) to charge the FPS II.

In addition, the exposure time with FPS II is relatively long, and operation within the so-called FPS strobe synchronization limit speed range is
As shown in the figure, the front curtain 13 is opened, the strobe trigger switch is turned on at point X, and the screen is moved from position PI to P2.
The flash device a17 is made to emit light with everything opened until the end.

The above operations complete photography in the focal plane shutter mode.

In the embodiment described above, the setting means 16 allows the user to set an operation section formed outside the camera, attaches the flash device 17 to the camera, or puts the flash device built into the camera into use, or It is possible to automatically detect the brightness of the subject or the backlight condition and perform automatic exposure operation using a flash device.

Further, a single-lens reflex camera can also be configured based on the idea of the present invention.

(Effects) As is clear from the above description, the single switching means 15 determines whether LS or FPS is activated, and when the setting means 16 sets the camera to a state requiring the flash device 117. , FPSII, or
Even if either LS8 is activated, the sequence control circuit SC activates LS and FPS at the appropriate timing to take correct photographs synchronized with the flash light, effectively utilizing the characteristics of the two shutters according to the purpose of photography. It is possible
Ru.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a sectional view of the camera, Fig. 2 is a block diagram showing the operating system of the camera, and Fig. 3 is a block diagram showing the operating system of the camera.
Figures (a) and (b) show flowcharts of the camera, and Figures 4, 5, and 6 show operation diagrams. 1... Camera body 2... Shooting lens 5... Viewfinder 7... Release button 8... ......Lens shutter 11...Focal plane shutter 1
5......Switching means 16...Setting means 17...Flash device 20...
... Focal length setting means 105 ... Calculation means 107 ... Forced switching means SC ... Sequence control means DI ...
......First driving means D2......Second driving means and beyond

Claims (1)

[Scope of Claims] A camera equipped with a lens shutter and a focal plane shutter that performs program exposure operation and aperture adjustment operation, including a lens shutter mode in which the lens shutter operates as a program shutter, and a shutter speed is controlled by the focal plane shutter. and a switching means for setting a focal plane shutter mode in which the aperture is controlled by the lens shutter, a first driving means for controlling the programmed exposure value and/or the aperture value of the lens shutter, and an operating time of the focal plane shutter. a second driving means for controlling; a sequence control means for controlling the operation timing of the two driving means; a setting means for selecting and setting automatic exposure using natural light and automatic exposure using flash; When set to automatic exposure,
A flash photography switching device comprising: forced switching means for setting a lens shutter mode regardless of the setting of the switching means.