JPS5943545Y2 - Camera driven and controlled by motor drive circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dual-priority automatic exposure control (AE) camera that performs continuous shooting using an electric drive device.

In recent advances in single-lens reflex cameras, the so-called T
2. Description of the Related Art TTL-AE cameras equipped with a TL automatic exposure control device have been put into practical use.

In this type of camera, there are two types: the shutter-priority type, which determines the shutter speed first and automatically obtains the appropriate aperture value, and the aperture-priority type, which determines the aperture value first and then automatically determines the shutter speed. It is difficult to determine which one is better depending on the circumstances at the time of photography.

Therefore, it is ideal for such a TTL-AE camera to be able to switch between dual-priority and 7-mode photography with a simple operation, and various systems have been proposed for this purpose.

The so-called TTL-drive AE camera, which is a dual-priority type TTL-AE camera that uses an electric drive to perform continuous shooting, has been requested by many media photographers, high-class amateur photographers, etc., and has been used in various types. A method has been developed.

7. For continuous shooting with a tar drive camera, a shutter-priority AE camera is mainly suitable for the shooting purpose, but for frame-frame shooting, whether to use shutter-priority or aperture priority is determined by the photographer's will. Should.

The present invention has been developed in view of this point, and includes a shutter speed control circuit (corresponding to 39 of the embodiment) that controls the shutter speed according to the photometric output and the preset aperture value.

), which controls the shutter with an aperture priority mode, adjusts the aperture to an aperture value according to the photometry output and the preset shutter speed value, and controls the shutter speed control circuit with the preset shutter speed value. In a camera that has a shutter priority mode for controlling the shutter speed and allows manual selection of the aperture or shutter priority mode, the camera responds to an exposure end signal generated when the shutter speed control by the shutter speed control circuit is completed. A shutter charger (corresponding to M in the embodiment) that operates as a shutter charger.

), in the continuous shooting mode, the shutter is charged by a shutter after each exposure, and each time the shutter charge is completed, the camera's shutter is released to perform continuous shooting and one frame. In the photographing mode, a switching circuit (in the embodiment) prohibits the continuous shutter charging and release operations, performs frame photography, and detects the selected state of the photographing mode of the electric drive device. It corresponds to 46.33°33'.

), when the continuous shooting top mode is selected, the shooting top mode of the camera is switched from the aperture priority top mode to the shutter priority seventh mode. The mode can also be selected, and in the continuous shooting mode, the shutter priority mode is forcibly switched to the seventh mode, and the priority mode can be selected according to the continuous shooting mode.

Next, the camera according to the present invention will be explained.

FIG. 1 is a diagram showing the circuit configuration and main parts of an embodiment of the camera and electric drive device constituting the present invention.

In the figure, A surrounded by dotted lines is the camera body, B is an interval timer, and C'□ is an electric drive device.

Note that A and C flames and B and C are connection terminals t□ to t8 and t.
11 to t8' are electrically connected to each other, and the camera body A and the electric drive device C are connected to each other through a winding coupler 49.
They are mechanically connected at 50.

In FIG. 1, 10 to 15 inside the camera body A.
shows the optical system of a well-known single-lens reflex camera, and 10
11 is a photographing lens, 11 is an aperture, 12 is a mirror, 13 is a condenser lens, 14 is a pentaprism for a finder, and 15 is an eyepiece lens.

16 is a light-receiving element of a light-receiving circuit disposed in the eyepiece;
Reference numeral 7 denotes a light emitting diode for displaying photographing information, etc. in the finder, and displays shutter speed, aperture value, warning value, etc.

18 to 24 are the main components of the focal-blen shutter of a single-lens reflex camera, 18 is the front curtain of the shutter, 19 is the rear curtain of the shutter, and 20 is the shutter opening (
21 is a lever for running the leading curtain, 22 is a lever for running the trailing curtain, 23 is a front curtain tensioning lever, and 24 is a trailing curtain tensioning lever.

Further, Sl is a shutter count start switch that is linked to the running of the leading curtain, S2 is a safety switch that is turned on only from the completion of winding to the completion of the trailing curtain, and Mg1 is an electromagnetic magnet for running the trailing curtain.

25 is a release button provided on the camera body side, S3
S4 is the switch for the photometry and display circuit that is turned on with the first stroke of the release button 25, and S4 is the switch for the release button 2.
This is an exposure control and shutter release switch that is turned on at the second stroke of No. 5.

26 is a circuit consisting of a display circuit 21, an arithmetic circuit 28, and a shutter release circuit 29, and is also supplied with power from a power source E built into the camera body.

30 is a preset aperture signal setting circuit, which is set when the camera is used in aperture priority mode, and 31 is a preset shutter speed signal setting circuit, which is set when the camera is used in shutter priority mode.
Set if

Reference numeral 32 denotes a film sensitivity information source, and the information from these information sources 30, 31, and 32 is switched by a first photographic mode switching circuit 33 and input to the arithmetic circuit 29.

34 is a warning circuit that displays a battery check, a misset, etc. with a light emitting diode 17 in the viewfinder.
It is designed to be recognized when 0 light is emitted.

The circuit 35 is a self-holding circuit 36 composed of switch means.
．． 36' Exposure control circuit 37, release mechanism drive circuit 38
and a shutter time control circuit, and is connected to a power source E□ in the camera body via a safety switch S2.

Therefore, the arithmetic circuit 28 and display circuit 21 can be turned on at any phase of the camera by pressing the release button 25, but the exposure control circuit 37, release mechanism drive circuit 38, and shutter speed control circuit 39 are safe. The switch S2 is turned on only while the switch S2 is on, that is, from the completion of charging of the shutter rear curtain 19 until the rear curtain travels.

M g 2 is a release electromagnetic magnet that controls the raising of the drive mirror 12 of the aperture 11 and the movement of the shutter front curtain 18 .

Reference numeral 33' denotes a second photographic mode switching circuit which has shutter priority and aperture priority, and is controlled by manual switching and a control signal from electric drive device C to perform seven mode switching.

40 in device B is an interval timer circuit, which is connected to terminal t5wt6tt7etB of electric drive device C through terminals tI5, t6, t7, and t'8.

Next, in the electric drive device C, numeral 41 is a relay timer circuit, 42 is a release circuit, and 43 is a switching circuit, which controls the winding 7-tar M on and off.

44 is a 7-ter M brake circuit.

Further, 45 is a delay circuit for automatically stopping film winding if the 7-tar M does not finish winding the film after a predetermined period of time; 47 is a release button provided on the electric drive device, S5 is a release switch that is turned on when the release button 41 is pressed down, E2 is a power source for the electric drive device, and S6 is a power source thereof. It's a switch.

Note that the switch S7 is a switch that controls when the release timer circuit 9 is not operating, and the switch S8 is a switch that determines whether or not the interval timer B is used.

The operation of the electrically driven camera configured as above will be explained.

First, it is assumed that both the main body A of the camera 2 and the electric drive device C are in a completely hoisted state.

First, when the release button 47 in the electric drive device C is pressed down, the release switch S5 is turned on, and the start signal 120 turns on the release circuit 42.

Further, the shutter release start signal 121 is sent to the terminal t2. t
'2 to the shutter release circuit 29 in the camera body A, and also to the terminal j5sj'5 to the circuit 40 of the interval timer B.

When S8 is on, the interval timer circuit 40
Start counting the set seconds.

The shutter release start signal 121 is also transmitted to the release timer circuit 41, which turns on the release timer circuit 41, turns on all the circuits 26, and turns on the display circuit 27 and the calculation circuit 28.

One frame transmitted to the switching circuit 43 of the 7-ter M,
The continuous shooting signal 122, which is the output signal from the continuous shade determining means 46, is transmitted to the seven-shade switching circuit 33, 33' via the terminal j3*j'3.

Note that it is also possible to configure such that the electric drive device attachment signal 123 that is output when the electric drive device C is attached to the camera A is also transmitted to the seven-way switching circuit 33, 33'.

Therefore, when the electric drive device C is in the continuous shooting state or when the device C is attached to the camera, the seven-door switching circuits 33 and 33' are switched to the shutter priority shooting state.

Therefore, in this state, the arithmetic circuit 28 receives the object brightness signal 124 from the light receiving element 16, the shutter time signal 125 from the shutter time signal setting circuit 31, and the film sensitivity signal 126 from the film sensitivity information source 32.
is done manually.

When the discriminating means 46 of the electric drive circuit C is switched to the single-frame shooting side, the camera is not necessarily used as a shutter-priority system, but may also be used as an aperture-priority system.

In this case, the seven-mode switching circuits 33 and 33' are switched to the aperture priority side, and the arithmetic circuit 28 receives the subject brightness signal 124 from the light receiving element 16, the photographing aperture signal 121, and the film sensitivity from the film sensitivity information source. A signal 126 is input.

In this case, of course, the aperture value is preset manually.

In any of the above cases, the calculation circuit 28 performs calculations based on this information, and sends the output at this time, that is, the aperture value, shutter time, etc., to the display circuit 27, which receives the information from the calculation circuit 28. Aperture value depending on the output of
A light emitting diode 11 displays the shutter time and other information in the finder.

When the calculation is completed, the circuit 35 is turned on. In this state, the camera has completed winding and shutter charging, and the safety switch S2 is on.

In the circuit 35, the self-holding circuits 36 and 36' start operating, and when the release button 47 of the device C is released, exposure is maintained even if the release switch S5 is turned off. The power supply to the circuit 35 is maintained in the on state until completion.

At the same time, the exposure control circuit 37 starts operating, and at this time, since the camera has already been switched to shutter priority mode by the seven-door switching circuit 33, 33', the appropriate aperture value determined by the arithmetic circuit 28 is set. The preset aperture signal 12
8, this is connected to the diaphragm 11 via the 7-door switching circuit 33.
The feed diaphragm mechanism 11 is preset by this value.

Furthermore, if the camera is switched to the single-frame shooting side, which is a consecutive seven-frame selection means, it becomes possible to switch to an aperture-priority camera.

At this time, in the same manner as above, the appropriate shutter speed signal 129 determined by the arithmetic circuit 28 is sent to the mode switching circuit 3.
3' to the shutter speed control circuit 39.

At the same time, the release mechanism drive circuit 38 also starts operating, turns on the release electromagnet Mg2, and sets the aperture 11 to the preset aperture value (in the case of aperture priority, the aperture is adjusted to the preset aperture value, in the case of shutter priority After stopping the shutter down to the aperture value determined by the preset aperture signal 128 and raising the mirror 12, the front curtain tensioning lever 23 is rotated clockwise around its shaft 23', and the shutter front curtain 18 is adjusted by the lever. Release the lock.

As a result, the shutter front curtain 18 is acted upon by the spring 21 and moves in the direction opposite to the arrow F in the figure.

When the shutter front curtain 18 starts running, the shutter speed control circuit 39 uses the exposure start signal 130 from the count start switch Sl to control the adjusted shutter speed (in the case of shutter priority, the preset shutter speed, In the case of aperture priority, counting of shutter seconds is started using a shutter seconds signal 129.

When the shutter time control circuit 39 of the circuit 35 finishes counting the adjusted time, it turns on the trailing curtain running electromagnet Mgx.

When the electromagnet Mgl is turned on, the rear curtain tension lever 24
rotates clockwise around its axis 24', and the shutter rear curtain 19 runs in the opposite direction of arrow F by the spring 22.
When the exposure is completed, the safety switch S2 is turned off.

When the l switch S2 is turned off, the circuit 38 is turned off,
At this time, safety switch S2 connects terminal 1□, t'1.
The exposure completion signal 131 is sent to the AN in the electric drive device C via
It is input as the second input signal of D gate 47'.

The release timer completion signal 132 of the release timer circuit 41 of the D device is input as an input signal to the OR game 48 (7) Ml.

Also, the second input signal of the OR gate 48 is the release timer off signal 133 obtained by turning off the switch S7.

Therefore, the OR gate 48 outputs the release completion signal 134 when the release timer is not used or when the release timer finishes counting a predetermined number of seconds.

The release completion signal 134 is the second one of the AND gate 47'.
is input as an input signal.

Therefore, the AND gate 47' transmits the winding start signal 135 to the switching circuit 43 when the shutter trailing curtain 22 runs and the release timer finishes counting a predetermined number of seconds.
and output to the delay circuit 45.

The delay circuit 45 receives the hoisting start signal 135 manually and starts counting a predetermined time.

(At this time, the delay time set in the delay circuit 45 needs to be somewhat longer than the time required for normal winding.

That is, for example, if the time required for winding varies from about 150 m5 to 300 m5 depending on the voltage fluctuation of the power supply E2 in the electric drive device C, the delay time of the delay circuit 45 is 50 m5.
It is necessary to set it to about 0m5.

) When the switching circuit 43 is turned on, the septa M starts rotating, and the inside of the electric drive device C and the camera body A are
The leading shutter curtain 18 and the trailing shutter curtain 19 are moved in the direction of arrow F through the winding couplers 49 and 50 inside to charge the shutter and perform winding such as film winding.

When the winding operation is completed, the shutter charge is also completed, so the safety switch S2 is turned on and the winding completion signal 136 is output.
is input as the first input signal to the AND gate 51, and at the same time, the switching circuit 43 is turned off to cut off the power supply to the septa M.

The seventh motor M, which is de-energized, is braked by the brake circuit 44 and rapidly stops.

Note that when the winding operation is performed normally, the delay time of the delay circuit 45 is set to be somewhat longer than the time required for winding, as described above, so the switching circuit 43
is turned off based on the signal when the safety switch S2 is turned on, and the seventh motor M is braked and stopped by the play circuit 44, but during the winding operation, the winding mechanism is stopped due to, for example, running out of film. In such a case, the safety switch S2 will not turn on even after the delay time set in the delay circuit 45 has elapsed, and therefore the switching circuit 43 will remain on, and the energization of the seventh motor M will be interrupted. Since it is not cut off, at this time, even if the switching circuit 51 is turned off by the count end signal from the delay circuit 45, the power supply to the septa M is cut off.

When the above-mentioned interval timer circuit 40 finishes counting a predetermined time, it outputs an interval timer completion signal 1.
31 is input as the first input signal of the OR gate 52 of the C device via the terminal t7*j'7.

The second input signal of the OR gate 52 is the interval timer off signal 1 generated when the switch S8 is turned off.
It is 30.

The third input signal of the OR gate 52 is a trigger signal of an oscilloscope or the like inputted from the external trigger terminal 53;
This is an external trigger signal 139 caused by the movement of the subject or the like.

Therefore, the OR gate 52 outputs the interval completion signal 140 when the interval timer is not used, when an external trigger signal is input, or when the interval timer finishes counting a predetermined time.

The interval completion signal 140 is the second
becomes the input signal.

When the film winding is completed and the interval is completed, the AND gate 51 outputs a shutter release start signal 14.
1 is output to the release circuit 42.

The release circuit performs shutter release again.

By repeating the above operations, the camera performs continuous shooting.

It should be noted that since the switching circuit 43 is turned off in the -frame 7-de, continuous photographing is prevented.

As described above, in the present invention, when performing continuous shooting with a dual-priority type AE camera using an electric drive device, it is possible to automatically switch to the shutter-priority type AE camera that is most suitable for shooting. The 7-drive mode can be selectively switched to shutter priority or aperture priority mode, making it a practically effective device for continuous shooting and frame-by-frame photography using the 7-drive drive, and its effects are as follows. It is a big thing.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the present invention and a mechanical diagram of main parts thereof. A...Camera, C...Electric drive device.

Claims (1)

[Scope of utility model registration request] The shutter speed control circuit controls the shutter at the shutter speed according to the photometry output and the preset aperture value.The aperture is adjusted to the aperture value according to the photometry output and the preset aperture speed. At the same time, the shutter speed control circuit performs shutter control based on the preset shutter speed value.
A shutter charge that operates in response to an exposure end signal generated when the shutter speed control by the shutter speed control circuit is completed in a camera that has a shutter speed control circuit and can manually select an aperture or shutter priority of -1゛. Soil-
In the case of continuous shooting mode, the 7-tar performs a shirt couch shot every time an exposure is completed, and furthermore, the shutter release operation of the camera is performed each time the shutter charge is completed to perform continuous shooting. a switching circuit that prohibits the continuous shutter charging and release operations in the one-frame photography mode, performs frame photography, and detects the selected state of the photography mode of the electric drive device; The camera is characterized in that when the continuous shooting top mode is selected in the camera, the shooting top mode of the camera is switched from the aperture priority top mode to the shutter priority seventh mode.