JPH0644124B2 - Film winding device for camera - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a film winding device for feeding an unexposed roll film in a film container to a film opening portion of a camera prior to the first photographing after film loading. Regarding

[Background of the Invention]

Film Patrone (film container) for photography
In a roll film camera that uses a roll film housed inside, the camera is loaded with a non-photosensitive roll film, and the back cover of the camera is closed to prepare for shooting until the first shooting. The so-called preparatory winding is performed to feed the photosensitive film of No. 1 to the film opening of the camera. In general, film winding and shutter / charging are performed by a series of operations of a winding lever or a winding knob common to the film, but in order to prevent double exposure, the winding device has to complete the film winding. The shutter release cannot be done, and conversely, the shutter release
It is configured so that the shutter and the charge cannot be performed unless the release is performed.

Therefore, as the method of the preparatory winding described above, generally, two methods of so-called blank copying or blank feeding are adopted. In both of these two methods, when the film is loaded, the leader part of the film that has already been pulled out from the film cartridge is wound up by the take-up spool of the camera, and the film is fed until the display symbol on the film counter shows "1". It is an operation to send. Of these, "blank copy" is an operation in which the film is fed until the film counter displays "1" by alternately repeating the pressing operation of the shutter button and the winding operation for one frame of film. In the preparatory winding of the blank copy, it is necessary to press the shutter button several times until the film counter displays "1", that is, until a predetermined unexposed film is fed to the film opening. However, "Jump feed" is the operation of continuously winding several frames of film until the film counter displays "1", and the shutter button is pressed until the film counter displays "1". The film can be continuously wound up without any operation. However, in a camera in which the motor is used to wind the film (including the spring motor), the preliminary winding of the loaded film can be performed unless the motor is started by pressing the shutter button for both the blank copy and the blank feed. Can not.

As another method, there is proposed a camera of a method in which the roll film in the film container is completely wound up by the first photographing after the film is loaded and then the photographing is performed while rewinding one frame at a time.

At the beginning, the preparatory winding is said to be "preliminary winding" in particular, but even in this preliminary winding, the electric winding is such that the preparatory winding of the film is started by pressing the shutter button. Become.

On the other hand, when the subject to be photographed has extremely low or high brightness, the shutter button or the direct shutter mechanism is locked based on the signal from the exposure meter device or automatic exposure device that measures the brightness and measures the appropriate exposure value. Alternatively, a camera provided with a so-called shutter locking device that disables the opening / closing function of the shutter is known.

Not only the shooting conditions on the subject side as described above, but also the shooting conditions on the camera side, that is, when the power switch for the automatic exposure device is not turned on, or when the lens cap or the lens cap for protecting the automatic focus detection window is used. There is also known a camera configured so that a shutter locking device (shatter / release preventing means) operates to prevent opening / closing of the shutter when the protective cover or the like is not removed. Furthermore, there is also a proposal regarding a camera equipped with a shutter lock device (shatter release release means) that disables shutter release before the taking lens is located at the in-focus position detected by the automatic focus detection device. For example, it is disclosed in Japanese Patent Laid-Open No. 57-37335 and is already known.

In addition, the completion of charging of the flash discharge lamp built into the camera is usually displayed by a warning by turning on the indicator lamp, but if charging of the flash discharge lamp is not completed, shooting is disabled. It is conceivable to equip a camera with a flash discharge lamp with such a shutter lock device.

As described above, the shutter lock device (shutter release preventing means) is extremely effective as a safety device for correct photographing. However, for cameras that require the pressing operation of the shutter button to wind the film,
Preparation of film It is not necessary at all for winding.
You have to turn on the power of the automatic exposure device, remove the cap of the taking lens, remove the protective cover of the automatic focus detection device, or wait until the focus detection of the automatic focus detection device and the charging of the flash discharge lamp are completed.

Therefore, the preparation operation before photographing is troublesome, and in particular, the exposure meter device and the automatic focus detection device which require a power supply battery have a drawback that the battery is wasted.

[Object of the Invention]

The present invention has a shutter release preventing means as described above, and in a camera capable of winding a film by pressing the shutter button, the film can be preliminarily wound up by a simple operation without fear of erroneous operation. An object is to provide a film winding device for a camera.

[Outline of Invention]

In order to achieve the above object, in the present invention, the winding means for starting the shutter / charge and the film winding in relation to the closing operation of the shutter, and the pressing operation of the release button while the shooting conditions are not adjusted. Shutter caused by
In a camera having a release means for preventing release, a switching means for displacing from a normal winding transmission position to a preparatory winding transmission position according to the movement of a displacement member moved for film exchange is provided, and this switching means is used for the preparatory winding transmission. When in the position, the release signal of the release button bypasses the blocking means, is directly transmitted to the winding means through the switching means, and the winding means is operated.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings.

FIG. 1 is a block diagram showing a first embodiment of the present invention incorporated in a camera having an automatic focus detection device and an automatic exposure control device. When the release button 2 of the switch means 1 is pressed in the idle shooting of the film performed immediately after the loading of the film or in the normal shooting after the end of the preparatory winding such as the preliminary feeding, the release signal is switched as described later in detail. It is input to the automatic focus detection device 5 through the normal winding contact 4a of the switching switch 4 controlled by the mechanism 3. In the switching mechanism 3, as shown in FIG. 3, a film counter 30 driven by a film feeding amount detecting mechanism (not shown) is moved to a start position (S) in association with opening and closing of the back cover 23 of the camera. When it automatically returns to
The movable contact piece 4C in FIG. 1 is configured so as to be switched from the normal winding contact 4a side to the preliminary winding contact 4b side. Further, the automatic focus detection device 5 receives the release signal of the release means 1 and starts the operation of the distance measuring light receiving means 5A, and the focus detection which performs the focus detection based on the output signal from the distance measuring light receiving means 5A. A circuit 5B and a focus adjusting motor M ₁ for moving a photographing lens (not shown) in the optical axis direction based on the focus detection signal from the focus detection circuit 5B
A motor drive circuit 5C for controlling the shutter speed, and a release prevention circuit 5D for preventing the shutter release operation of the automatic exposure control device 6 in the next stage until the focus adjustment is completed and outputting a release trigger signal when the focus adjustment is completed. Has been done.
Further, the automatic exposure control device 6 includes a trigger means 6A for actuating an electric shutter upon receiving a release trigger signal, and a shutter control means 6B for automatically controlling a shutter speed in accordance with a photocurrent of a light receiving element for detecting subject brightness. Consists of. Further, at the end of the closing operation of the shutter, the winding control device 7 starts the driving of the winding motor M ₂ in response to the shutter closing signal issued by the automatic exposure control device 6, and the shutter charge and the film for one frame are generated. It is configured to stop the winding motor M ₂ when it is wound up.

On the other hand, by opening and closing the back cover 23 (see FIG. 3), as will be described later in detail, the movable contact piece 4 of the switching switch 4 is moved.
When c is switched to the pre-winding contact 4b side, the release signal of the release means 1 bypasses the automatic focus detection device 5 and the automatic exposure control device 6, and the direct winding control device 7
It is transmitted to the motor control circuit 7A, hoist motor M ₂
Are configured to be driven. By driving the winding motor M ₂ , the shutter and the charge and the film for one frame are wound, but the film is further wound for several frames, and the film counter 30 is set to “1”.
When viewing a switching movable contact piece 4c of the switch 4 is switched normally contacts 4a side for winding is composed as winding the preparation Te cowpea to stop winding motor M ₂ is completed.

FIG. 2 is an electric circuit diagram of the first embodiment based on the block diagram of FIG. In FIG. 2, a distance-measuring sensor (distance-measuring light-receiving means) 5A for receiving light from a subject through a photographing lens (not shown) is a predetermined focal plane (focus position) conjugate with a film surface (not shown) in the camera body. It is composed of two light receiving elements 11a and 11b arranged slightly in front of and slightly behind P, and when the object image matches the light receiving surfaces of the light receiving elements 11a and 11b, the output of each light receiving element becomes maximum, and When the subject image is located at the equidistant position (predetermined focal plane) P from each light receiving surface, the outputs of the respective light receiving elements 11a and 11b are equal to each other. The respective outputs of the light receiving elements 11a and 11b corresponding to the image forming position are supplied to the comparison amplification circuit 12 included in the focus detection circuit 5B.

The comparison / amplification circuit 12 determines whether the subject image is the front focus, the rear focus, or the in-focus point.
A part of the determined output signal is transmitted to the motor drive circuit 5C, and the focus adjustment motor M ₁ is driven and controlled by the motor drive circuit 5C. In addition, the comparison and amplification circuit 12
The other one of the output signals determined by
And the release prevention circuit 5D.

The display circuit 13 causes the display elements 13a and 13b to emit light at the same time according to the output signal of the comparison and amplification circuit 12 to display a focused state, and causes either of the display elements 3a or 3b to emit light. It is configured to display the focus or the rear focus. Also, the release prevention circuit 5D is AND
The AND circuit 14a, which includes the circuit 14a and the transistor 14b and receives the signal from the comparison and amplification circuit 12, detects whether or not it is in focus, and when the focus is out of focus, that is, only one of the display elements 13a and 13b. While the is on, the transistor 14b is turned off, and the transistor 14b is turned on only when the focus is achieved.

On the other hand, when the preliminarily winding of the film is completed and the film counter 30 controlled by the switching mechanism 3, which will be described in detail later, enters a state of displaying "1", the switching switch 4 interlocked with the film counter 30 is moved. Contact piece 4
c is normally in contact with the winding contact 4a side. In this state, when the release button 2 of the release means 1 is pressed, the main switch Sw ₀ and the focus detection switch Sw ₁ are closed, and the automatic focus detection device 5 is powered on via the normal winding contact 4a of the switching switch 4. Power is supplied from E to start the focus detection operation. At the same time as the power supply to the automatic focus detection device 5, the capacitor C ₁ in the automatic exposure control device 6 is charged, and the capacitor C ₁ stores the accumulated charge when the switching transistor 15 becomes conductive. It is configured to discharge through the switching transistor 15 and the electromagnetic magnet Mg ₁ for opening the shutter. The capacitor C ₁ , the switching transistor 15 and the shutter opening electromagnetic magnet Mg ₁
And the trigger means 6A is configured. Further, the switching transistor 15 is configured to be in a conductive (ON) state when the transistor 14b in the release prevention circuit 5D is turned ON.

On the other hand, the electromagnetic magnet Mg ₁ for opening the shutter is configured to release the predecessor of the known shutter (focal plane shutter) 17 via the latch claw 16 for opening the shutter by energization to open the shutter. The shutter opening latching claw 16 may actually be a latching claw that latches the movable mirror of, for example, a single-lens reflex camera prior to the opening of the shutter 17. The shutter speed of the shutter 17 is controlled by the known shutter control means 6B. In other words, the switch Sw ₂
When the shutter is closed, the electromagnetic magnet Mg ₂ for closing the shutter is energized, and the trailing hook is blocked by the hook 18 for closing the shutter. Also, when the timing switch Sw ₃ is opened at the same time as running in the early evening, the shutter control circuit 19
Starts the time measurement, and after the time measurement (delay time) according to the photocurrent from the light receiving element 20 which is output according to the brightness of the subject, the power supply to the electromagnetic magnet Mg ₂ for closing the shutter is cut off, and the latter is released. The shutter 17 is configured to be closed.

When the shutter 17 is closed, the winding start switch Sw ₄ of the winding controller 7 is closed by a shutter closing completion signal transmitted from a rear curtain interlocking device (not shown) at the end of the trailing curtain travel. The winding motor M ₂ is closed by the winding start switch Sw _{4 and} the motor control circuit 7 is closed.
It is driven and controlled via A, and is configured to start film winding and shutter charge not shown. The film counter 30 displays the next 1
The length of the film wound up until the frame is displayed, or the length of the film corresponding to one frame is measured by a known film feed amount detecting device including a sprocket wheel (not shown) meshing with the film perforation. Part 1
At the beginning of film feeding for each frame, the winding stop switch Sw ₅ connected in series with the capacitor C ₂ is closed,
As a result, even if the winding start switch Sw ₄ is opened thereafter, the winding motor M ₂ continues to be driven. The winding stop switch Sw ₅ is configured to return and open when the winding of one frame of film and the shutter / charging are completed. On the other hand, the focus detection switch Sw ₁ is connected to the release prevention circuit 5
When the focusing signal is output from D, the return opening is performed. When the focus detection switch Sw ₁ is opened, the automatic focus detection device 5 stops the detection operation.
By opening the winding stop switch Sw ₅ , the winding motor M ₂ is stopped, and the shutter / charge and the film winding for one frame are completed.

Also, a capacitor C ₂ connected in series to the winding stop switch Sw ₅ and a resistor R connected to this capacitor C _2.
A timer circuit is configured with ₁ and. The timer circuit C ₂ -R ₁ is winding starts clocking charged by closing the stop switch Sw _5, when charging after a predetermined period of time has elapsed is complete, sends a low-level timing signal to the motor control circuit 7A, It is configured so that the power supply to the hoisting motor M ₂ can be cut off. However, the predetermined time which is determined Te that timer circuit C ₂ -R ₁ Niyotsu is hoist motor M ₂ is slightly longer setting than the time required to wind one frame of the film. Accordance connexion, usually the stop switch Sw ₅ winding early than the predetermined time is opened, since the hoist motor M ₂ by opening stops, it is not this timer circuit C ₂ -R ₁ acts effectively . However, when the winding stop switch Sw ₅ cannot be opened, for example, when the film which is not drawn for one frame lastly drawn out from the film cartridge is wound up, the winding motor M ₂ is overloaded. Therefore, the rotation of the motor may be stopped and the motor may be damaged. The timer circuit C ₂ -R _1, such, works effectively when the film is stopped in the middle winding it is film, winding motor M ₂ are thereby protected.

The resistance R ₂ which is provided in parallel with the capacitor C ₂ is intended to release the electric charge charged in the condenser C ₂ after opening of the winding stop switch Sw _5.

3 and 4 show the switching mechanism 3 shown in FIG.
3 is a plan view showing the configuration of FIG. 3, FIG. 3 shows a state in which the back lid of the camera is closed and pre-rolling is completed, and FIG. In FIG. 3, a return lever 24 and a switch switching operation lever 25, which come into contact with a back cover 23 that is openably and closably supported by a camera body 21 by a hinge shaft 22, are provided with torsion springs 26 and 27, respectively. It is biased so that it can rotate counterclockwise around. The pawl wheel 31 provided so as to rotate integrally with the film counter 30 includes a feed pawl 33 connected to a moving lever 32 that reciprocates left and right in FIG. 3 when the film moves by one frame, and a pawl wheel. The reverse rotation prevention claw 34 for preventing the reverse rotation of 31 is engaged, and the scale of the film counter 30 is advanced by one every time the moving lever 32 is reciprocally displaced. The return lever 24, the ratchet 3
1, the feeding claw 33 and the reverse rotation preventing claw 34 have the same configurations as those used in a known film counter, and therefore detailed description thereof will be omitted.

A switch lever 35, which is provided so as to be always in contact with the circumferential surface 30a of the film counter 30, is rotatably supported by a shaft 36 and is urged by a torsion spring 37 so as to always rotate counterclockwise. When the movable contact piece 4c of the switching switch 4 is interlocked with the shaft 36 and the end 35a of one arm of the switch lever 35 is in contact with the circumferential surface 30a of the film counter 30 as shown in FIG. The movable contact piece 4c is constructed so as to be in contact with the winding contact point 4a so as to be conductive. Further, when the back cover 23 is opened as shown in FIG. 4, the switch switching operation lever 25 moves the torsion spring 3
The urging force of 7 rotates counterclockwise around the pin shaft 29, and the end 25a of one arm of the pin shaft 29 is switched to the switch lever 35.
And the switch lever 35 is rotated clockwise against the biasing force of the torsion spring 37 to switch the movable contact piece 4c of the switch 4 to the pre-winding contact 4b side via the shaft 36. Has been done.

On the other hand, when the back cover 23 is opened, the return lever 24 is rotated counterclockwise about the pin shaft 28 by the biasing force of the torsion spring 26, as shown in FIG. Both the claw 33 and the reverse rotation preventing claw 34 are provided with a claw wheel 31.
Remove from Therefore, the film counter 30 has the nail wheel 3
Along with 1, the spiral spring (not shown) automatically returns to the counterclockwise direction and stops at the position where the start position "S" is displayed. Due to the automatic return of the film counter 30, the protruding portion 30b provided on the outer peripheral surface of the film counter 30 is projected.
Is configured to be placed in a close position where it can come into contact with the end portion 35a of one arm of the switch lever 35. Therefore, when the back cover 23 is closed and the switch switching operation lever 25 is rotated clockwise against the urging force of the torsion spring 27 as shown in FIG. 3, the switch lever 35 is rotated. Since the end portion 35a of one arm contacts the protruding portion 30a of the film counter 30 and is hardly displaced in the counterclockwise direction, the movable contact piece 4c of the switching switch 4 remains on the side of the preliminary winding contact 4b.

Now, in FIG. 2, in the case of normal winding, power is supplied to the automatic focus detection device 5 and the automatic exposure control device 6 via the normal winding contact 4a of the switching switch 4, and further winding control is performed via the diode D _1. Power is supplied to the device 7. However, in the case of winding preparation, the power from the Preparative winding contacts 4b are bypassing the automatic focus detection device 5 and automatic exposure control device 6 is supplied via the diode D _2, the automatic focus detection device 5 and automatic The power supply to the exposure control device 6 is configured to be cut off by the diode D ₁ . Further, press the release button 15 and press the switch Sw.
The release signal when ₀ is closed is configured to be sent to the connection motor control circuit 7A through the bypass circuit L ₁ that bypasses the hoisting stop switch Sw ₅ and the capacitor C ₂ . Therefore, the motor stop switch Sw ₅
, The winding motor M ₂ continues to be driven to wind the film for several frames, and the film counter 30 moves from the start position (S) shown in FIG. 4 to several positions as shown in FIG. When the switch lever 35 is rotated until "1" is displayed, the end portion 35a of the switch lever 35 is disengaged from the projecting portion 30b of the film counter 30, and is rotated counterclockwise by the urging force of the torsion spring 37 to rotate the shaft 36. The movable contact piece 4c of the switching switch 4 is automatically switched to the normal winding contact side via the connection.

Since the first embodiment shown in FIGS. 1 to 4 is constructed as described above, first, when the back cover 23 is opened for loading the film, the film counter 30 starts the start position "S" as shown in FIG. Then, the protruding portion 30b is placed at a position where it can abut the end portion 35a of the switch lever 35. Further, in this state, the movable contact piece 4c of the switching switch 4 is connected to the pre-winding contact 4b side. When the back cover 23 is closed after the film is loaded, the switch switching operation lever 25 is pressed by the back cover 23 and rotates clockwise about the pin shaft 29 against the biasing force of the torsion spring 24. Therefore, in conjunction with this, the switch lever 35 can be rotated counterclockwise by the urging force of the torsion spring 37. However, since the end portion 35a of the switch lever 35 comes into contact with the protruding portion 30b of the film counter 30, the switch lever 35 stays at that position with almost no displacement.

Therefore, the movable contact piece 4c of the switching switch that can be displaced integrally with the switch lever 35 also remains on the side of the pre-winding contact b. Further, the return lever 24 rotates in the clockwise direction against the biasing force of the torsion spring 26 by the pressing of the back cover 23, and engages the feed pawl 33 and the reverse rotation prevention pawl 34 with the ratchet wheel 31.

Next, when the release button 2 is pressed to close the switch Sw ₀ , power is supplied to the hoisting control device 7 through the preparatory hoisting contact 4b of the switching switch 4 and the diode D ₂ , and the high level signal is bypassed. Since it is transmitted to the motor control circuit via the circuit L ₁ , the winding motor M ₂
Starts driving. However, the automatic focus detection device 5 and the automatic exposure control device 6 are not supplied with power because their power supply circuits are cut off by the switching switch 4 and the diode D _1, and do not start their operations.

The drive of the winding motor M ₂ starts the winding of the shutter / charge and the film, and when the film is wound by one frame, the winding stop switch Sw ₅ and the focus detection switch Sw _{1 are} opened. However, since the high level signal is input to the motor control circuit 7A via the bypass circuit L ₁ , the winding motor M ₂ continues to rotate and the film is continuously wound for several frames.
In response to the film winding, the feed claw 33 reciprocates to rotate the film counter 30 together with the ratchet wheel 31 in the clockwise direction. At a point slightly before the display symbol indicates "1", the end of the switch lever 35 is moved. The portion 35a is disengaged from the protruding portion 30b of the film counter 30. Therefore, the switch lever 35 is rotated in the counterclockwise direction by the urging force of the torsion spring 37, and the end portion 35a thereof has the film counter 3 as shown in FIG.
It abuts the circumferential surface 30a of zero. Along with the counterclockwise rotation of the switch lever 35, the movable contact piece 4c of the switching switch 4 is normally switched to the winding contact 4a side.
By this switching of the switching switch 4, power is normally supplied to the motor control circuit 7A through the winding contact 4a and the diode D ₁ . At this time, the high level signal from the bypass circuit L ₁ for driving the winding motor M ₂ is cut off by the diode D ₂ . However, instead of this, a high-level signal is transmitted through the winding stop switch Sw ₅ and the capacitor C ₂ , the winding motor M ₂ rotates slightly, and the winding stop switch Sw ₅ opens to open the winding motor. M ₂ is stopped and a series of preparatory winding is completed.

After the film is ready and wound up, release button 2 again
When is pressed, the main switch Sw ₀ is closed, power is supplied to the automatic focus detection device 5 and the automatic exposure control device 6 via the normal winding contact 4a of the switching switch 4, and further winding control is performed via the diode D _1. The device 7 is powered. At the same time, the focus detection switch Sw ₁ is closed by pressing the release button 2, and a high level signal is output to the automatic circuit 5.
Input to B, the focus detection operation is started. While one of the display elements 13a and 13b is turned off by the operation of the focus detection circuit 5B, that is, while the subject image is not in focus, the transistor 14b in the release prevention circuit 50 is turned off. Yes, the switching transistor 15 is also placed in the OFF state.

Therefore, the electric charge of the capacitor C ₁ charged by closing the main switch Sw ₀ is not discharged through the electromagnetic magnet for opening the shutter, and the shutter 17 is not released.

On the other hand, while either the display element 13a or 13b is off, the focus adjustment motor M ₁ is driven via the motor drive circuit 5C in accordance with the detection signal from the focus detection circuit 5B, and the photographing (not shown) is performed. The lens is moved back and forth in the optical axis direction, and focus adjustment is automatically performed. When the subject image reaches the in-focus point, the in-focus signal is output from the focus detection circuit 5B, the focus adjusting motor M ₁ is stopped, and the focus detection is completed. When the subject image reaches the in-focus point, both the display elements 13a and 13b are turned on, and the release prevention circuit 5D
Transistor 14b turns on.

When the transistor 14b is turned on, the release trigger signal causes the switching transistor 15 to become conductive, and the charge stored in the capacitor C ₁ is discharged through the switching transistor 15 and the electromagnetic magnet Mg ₁ for opening the shutter. By energizing the electromagnetic solenoid Mg ₁ for opening the shutter, the latch claw 16 for opening the shutter is activated, the front curtain of the shutter 17 is released, and the shutter 17 is opened. By the operation of the latch for opening the shutter 16, the switch Sw ₂ is closed before the leading of the front curtain, and the electromagnetic solenoid M for closing the shutter is opened via the shutter control circuit 19.
It is energized g _2, the running of the trailing curtain pawl for shutter opening 1
8 is temporarily blocked. Also, the switch Sw for timing
Timing is started at the same time as the opening of ₂ , and after the time measured according to the photocurrent from the light-receiving element 20, the energization to the electromagnetic magnet Mg ₂ for closing the shutter is cut off, the rear curtain is released, and the shutter 17 is released. The opening / closing operation ends.

When the shutter 17 is closed, the winding start switch Sw ₄ is closed at the end of the trailing curtain travel, and the winding motor M ₂ starts driving. The winding motor M ₂ is driven to start the film winding for the shutter / charge and one frame, and the winding start switch Sw ₄ is opened during the film winding. However, since the winding stop switch Sw ₅ is closed before that, the winding motor M ₂ continues to rotate, and the film measured by a film feeding amount detecting device (not shown) reaches one frame. At the same time, the hoisting stop switch Sw ₅ is opened, the signal (low level) is transmitted to the motor control circuit 7A via the capacitor C ₂ , and the hoisting motor M ₂ is stopped. Also, part 1
As the film moves for each frame, the film counter 3
0 is rotationally displaced by one index on the display scale by the feed claw 33 to display the number of frames to be photographed. Further, the focus detection switch Sw ₁ is opened at the same time as the winding stop switch Sw ₅ is opened, and the automatic focus detection device 5 stops the focus detection operation.

When the release button 2 is pressed again, a series of operations of the automatic focus detection device 5, the automatic exposure adjustment 6 and the winding control device 7 are continuously performed, and the filming of one frame of film is completed. When the number of times of photographing reaches the number of films accommodated in the film cartridge and the last film length is less than one frame, the winding stop switch Sw ₅ is not opened. In this case, work timer circuit C ₂ -R _1, since sending a low-level signal after a predetermined time to the motor control circuit 7A, the hoist motor M ₂ stops.

As described above, according to the first embodiment described above, the release prevention circuit 5D operates during focus detection, and the shutter 17 is not released even if the release button 2 is pressed, and film winding is temporarily disabled. This will hinder the preparation and winding of the film. However, the release prevention circuit 5
Since the changeover switch 4 for disabling the D blocking function is interlocked with the opening and closing of the camera back cover 23 and the release button 2 is pressed, the linear take-up control device 7 is operated. Can be done.

In FIG. 2, the main switch Sw ₀ opened and closed by the release button 2 is closed by pressing the release button 2 and then opened by a stop signal of the winding motor. By doing so, a series of operations can be performed even if the release button 2 is released immediately after it is pressed.

FIG. 5 is a circuit diagram showing a second embodiment of the present invention in a camera in which the shutter release is prevented when the shutter speed is equal to or lower than the shake limit. The parts having the same functions as those in the first embodiment shown in FIG. 2 are designated by the same reference numerals as those in FIG.

In FIG. 5, the release button 102 is configured to be capable of performing a so-called full-push operation of pushing down the entire stroke and a so-called half-push operation of pushing the release button 102 halfway. When the release button 102 is half-pushed, The main switch Sw ₀ is closed, and the shutter control circuit 119 and the motor control circuit 7A.
Is supplied from the power source E. When the release button 102 is fully pressed, the shutter opening latching claw 116 is actuated to open the shutter 17, and the shutter opening latching claw 11 is opened.
By the operation of 6, the switch Sw ₂ closes slightly before the opening of the shutter. A switch Sw ₂ is provided to each terminal of the shutter control circuit 119, a light receiving element (photoelectric conversion element) 20 for subject brightness detection, a timing switch Sw ₃ opened when the shutter is opened, and an output photoelectric communication of the light receiving element 20. 17 after the delay time measured by
The bases of the transistors 115 for supplying power to the electromagnetic magnet Mg ₂ for closing the shutter and the electromagnetic magnet Mg ₃ for blocking the release are respectively connected.

Further, the shutter control circuit 119 determines that the shutter speed determined based on the aperture value, the film sensitivity, and the subject brightness detected by the light receiving element 20 is equal to or lower than a predetermined hand shaking limit, and the base of the transistor 115. The potential is dropped from a high level to a low level to turn on the transistor 115. Further, the release-blocking electromagnetic magnet Mg ₃ is configured so as to block the operation of the shutter-opening latching claw 116 by being energized and block the opening of the shutter 17 even if the release button 102 is pressed. .

On the other hand, a switching switch 4 for switching between normal winding and preparatory winding is provided between the winding stop switch Sw ₅ and the bypass circuit L _1, and the normal winding contact 4 a of the switching switch 4 is a winding stop switch. connected to sw _5, is directly connected to the motor control circuit 7A and the other preparatory winding contacts 4b through the bypass circuit L ₂ to bypass and the stop switch sw ₅ winding capacitor C _2. The preparation winding contact 4b is connected to the base of the transistor 121 via the resistor R _3, and the emitter of the transistor 121 is connected to the base of the transistor 115. The movable contact piece 4c of the switching switch 4 is
When the back cover of the camera is opened, the contact 4a for normal winding
Side to the pre-winding contact 4b side automatically,
Further, when the film counter 30 displays the symbol "1" after the film is preliminarily wound, it is switched to the normal winding contact 4a side again. The structure and operation are exactly the same as those shown in FIGS. 3 and 4 in the above-described first embodiment, and therefore the drawings and the description thereof are omitted here.

Since the second embodiment shown in FIG. 5 is constructed as described above,
When the back cover of the camera is opened to load the film, the film counter 30 automatically returns and stops at the position where the start signal "S" is displayed, as shown in FIG. Further, the movable contact piece 4c of the switching switch 4 is also in contact with the side of the preliminary winding contact 4b. In this state, when the back button is closed and the release button 102 is half-pressed, the main switch Sw ₀ is closed, and the base of the transistor 121 is provided with the switching switch 4.
Since the current flows through the winding contact 4b, the bypass circuit L ₂ and the resistor R ₃ , the transistor 121 is
When turned on, the base potential of the transistor 115 becomes low level. Accordingly, the transistor 115 is turned on, and the release-blocking electromagnetic magnet Mg ₃ is supplied with power through the transistor 115 to block the release operation of the shutter opening latching claw 116. Therefore, even if the release button 102 is fully pressed,
Since the release claw 116 for shutter opening is inoperable,
The shutter 17 is not opened. On the other hand, the motor control circuit 7
A inputs a high level signal via the bypass circuit L ₂ to start driving the hoisting motor M ₂ . The film is wound by the drive of the winding motor M ₂ , and several frames of film are continuously wound up, and when the film counter 30 displays “1”, the switching switch 4
The movable contact piece 4c is switched to the normal winding contact 4a side, the winding motor M ₂ is stopped, and the film is ready for winding.

The movable contact piece 4c of the switching switch 4 is the normal winding contact 4
When the main switch Sw ₀ is closed by half-pressing the release button 102 in the normal winding state connected to the a side,
The light receiving element 20 starts photometry. On the other hand, transistor 12
Since no current flows through the base of 1 through the bypass circuit L ₂ , the transistors 121 and 115 are both placed in the OFF state. Therefore, since no electric power is supplied to the release-blocking electromagnetic magnet Mg ₃ , the operation of the shutter-opening latching claw 116 is not restricted by the release-blocking magnet Mg ₃ . However, if the subject brightness is insufficient and the shutter speed determined by the shutter control circuit 119 is below the camera shake limit, the base potential of the transistor 115 becomes a low level, and the transistor 115 conducts to release the shutter. The electromagnetic magnet Mg ₃ is energized. Therefore, in this case, since the shutter opening latching claw 116 is constrained, even if the release button 102 is fully pressed, the shutter 17 is pressed.
Is not opened.

If the subject brightness is sufficient and the shutter speed is equal to or higher than a predetermined camera shake limit when determined according to the output photocurrent of the light receiving element 20, the base potential of the transistor 115 becomes a high level, so that the transistor 115 is turned off and the shutter is released. The opening retaining claw 116 is not restrained by the release preventing electromagnetic magnet Mg ₃ .

Accordingly, when the release button 102 is fully pressed, first, the light receiving element 20 immediately measures light in the half-pressed state, and then the shutter opening latching claw 116 operates to fully open the shutter 17 in the fully pressed state. . Also, a hook for opening the shutter
In conjunction with the operation of 116, the switch Sw ₂ closes slightly before the opening of the shutter and the switch Sw ₃ opens subsequently.
After a delay time corresponding to the photocurrent of the light receiving element 20, the energization of the shutter opening magnet Mg ₂ is cut off, the shutter closing hook 18 is activated and the shutter 17 is closed, and the exposure operation is completed. .

At the end of the closing operation of the shutter 17, the switch Sw ₄ is closed in conjunction with the closing operation, and the winding motor M ₂ starts driving. Although the drive of the hoist motor M ₂ shutter-Chiyaji and one frame of the film winding is performed, in the course of its film winding, in conjunction with the film moving, winding initiating switch Sw ₄ is opened.
However, before that, the winding stop switch Sw ₅ is closed, so that the winding motor M ₂ continues to be driven. When the film for one frame is wound up, the switch Sw for stopping winding is swirled.
Since No. ₅ is opened, the winding motor M ₂ is stopped, and a series of photographing operations is completed. Note that the latch for opening the shutter 116
Immediately returns to the original position after the shutter release operation and is ready for the next shutter charge.

In the second embodiment, when the shutter speed is equal to or lower than the camera shake limit, the release preventing electromagnetic magnet Mg ₃ prevents shutter release. However, like the camera shake limit, the flash unit is not charged. As a safety device for the case of completion, its release prevention electromagnetic magnet Mg ₃
Even when using, the pre-winding can be performed by controlling this by the switching switch 4 without wasteful light emission of the flash unit.

FIG. 6 shows a third embodiment of the present invention applied to a camera with a built-in flash.
2 and 5 are schematic electric circuit diagrams showing the embodiment of FIG.
Members having the same functions as those of the first and second embodiments shown in the figure are designated by the same reference numerals, and detailed description thereof will be omitted.

In the flash unit 200 provided in a part of the camera body, by closing the power switch Sw ₆ , power is supplied from a power source to a main capacitor (not shown) and charging is started. When the charging voltage reaches a predetermined voltage, the neon tube N is turned on to display the completion of charging, as is known. The neon tube N is connected to the base of the transistor 201, and is turned on when the neon tube N is lit, that is, charging is completed, and the neon tube N is extinguished, that is, is being charged, and the main capacitor is in a predetermined state. When the charging voltage of
It is configured to be in the OFF state. In addition, the transistor 202 has a base to which the collector of the transistor 201 is connected. When the transistor 201 is OFF, that is, during charging, the transistor 202 is in the ON state, and the transistor 2
It is configured to be turned off by the completion of charging when 01 is turned on. When the transistor 202 is turned ON, the release-blocking electromagnetic magnet Mg ₃ is locked by the shutter opening latch 1.
Even if the operation of 16 is restricted and the release button 102 is pushed down, the shutter opening latching claw 116 does not operate and the shutter 217 is not opened. This Shatter 217 is
Either a lens shutter or a focal plane shutter may be used.

When the release button 102 is pressed halfway down, the main switch Sw ₀ is first closed. At that time, if the neon tube N is off, the release blocking electromagnetic magnet Mg ₁ is immediately energized, and the shutter opening latching pawl. Restrain the movement of 116. However, when the neon tube N is turned on and charging is completed, the transistor 202 is turned off, and the electromagnetic force Mg ₃ for release prevention is cut off from the power supply. Therefore, the latch claw 1 for opening the shutter 1
Release the constraint on 16. Therefore, when the release button 102 is further fully pressed, the shutter opening latching claw 116 operates and the shutter 217 is opened. In conjunction with the opening of the shutter, the switch Sw _X is closed when the shutter opening is fully opened, the trigger capacitor C ₃ is discharged, the discharge lamp 200 flashes in a known manner, and the neon tube N is turned off.

On the other hand, after a certain time delay after opening the shutter, the shutter 21
7 is closed as is known, but in conjunction with the closing, the motor start switch Sw ₄ is closed and the hoisting motor M ₂ is closed.
Starts driving, and when the motor stop switch Sw ₅ is opened as in the first and second embodiments, the winding motor M ₂ is stopped, and the shutter / charge and the film winding for one frame are completed. Then, a series of flash photography ends.

The base of the transistor 203 is connected to the preparation winding contact 4b of the switching switch 4 via the bypass circuit L ₂ and the resistor R ₃ . The transistor 203 is provided in parallel with the transistor 202 with respect to the release blocking electromagnetic magnet Mg ₃ . Therefore, when the movable contact piece 4c of the switching switch 4 is switched from the normal winding contact 4a to the preliminary winding contact 4b by opening and closing the back cover of the camera, the release button 102 is half-pressed to operate the main switch. When Sw ₀ is closed, the transistor 203 is turned on regardless of whether the neon tube N is turned on or off, and the release preventing electromagnetic magnet Mg ₃ is supplied with power. Therefore, the latch claw 116 for opening the shutter is immediately released by the electromagnetic magnet M for blocking the release.
The operation is restricted by g ₃ , and the shutter 217 is not opened even if the series button 102 is fully pressed thereafter.

On the other hand, the winding motor M ₂ continuously winds the film by several frames by closing the main switch Sw ₀ , as in the case of the second embodiment shown in FIG. After that, film counter 3
0 displays a symbol "1", switching the movable contact piece 4c of the switch 4 is switched normally contacts 4a side for winding, winding motor M ₂ when the motor stop switch Sw ₅ is opened
Stops and the film is ready for winding.

In the above-mentioned second and third embodiments, since the shutter release stop of the shutter by the release preventing electromagnetic magnet Mg ₃ of the release preventing means is continued even during the pre-winding, the pre-winding is performed. Shatter is not opened. Therefore, in the second embodiment of FIG. 5, even when the subject is dark, the film is not wound while the shutter is open. Further, in the third embodiment shown in FIG. 6, the electric charge of the flash charge condenser, which is sharply charged, is not wastefully discharged.

Further, in general, in order to protect the taking lens, the taking lens is covered with a protective cap or the front lid of the camera when the camera is not used. If you cover the lens with a protective cap etc. in a small camera so that it will not be done,
2. Description of the Related Art There is one having a release button operation blocking mechanism configured so that the release button cannot be pressed and displaced. In such a camera, in the case of preliminary winding, in order to drive the winding motor, it is necessary to release the release button operation preventing mechanism.

7 to 9 are plan views of a switching mechanism used in the present invention in a camera having the shutter button actuation preventing mechanism as described above. FIG. 7 shows the release button releasing device with the protective cap attached, FIG. 8 with the protective cap of the camera of FIG. 7 removed, and FIG. 9 with the back cover of the camera of FIG. 7 open. Show. Since the film counter portion has many parts in common with the first embodiment shown in FIG. 3, members having the same functions as those in FIG. 3 are designated by the same reference numerals, and detailed description of the structure thereof will be omitted.

In FIG. 7, the movable contact piece 4c of the switching switch 4 is usually on the side of the hoisting contact 4a, and the electric circuit connected to this switching switch 4 is constructed as shown in FIG. 2, FIG. 5 or FIG. There is. The movable contact piece 4c is switch-controlled by a switch lever 35 'via a shaft 36. Case back 23
A switch lever 35 'engageable with a switch switching operation lever which is moved in association with the opening and closing operation of the film counter 30 has an arm having an end portion 35'a in contact with the circumferential surface 30a of the film counter 30 and another arm 35'b. Is formed, and one end of the release button blocking piece 38 is attached to the end of the arm 35'b of the pin shaft 39 (7A).
(See the figure), it is rotatably supported. The other end of the release button blocking piece 38 is also rotatably supported by a pin shaft 41 on a movable member 40 which can slide forward and backward (upward and downward in FIG. 7A). One end 40a (see FIG. 7A) of the moving member 40 is urged by a tension spring 42 so that it can be projected to the outside through an opening 21a provided in the front wall of the camera body 21, and the protective cap C is moved to the photographing lens L. When mounted as shown in FIG. 7, the transfer member 40 retracts against the urging force of the tension spring 42 so that the side edge portion of the release button blocking piece 38 enters the moving range of the step portion 2a of the release button 2. It is configured.

Since the fourth embodiment of FIG. 7 is configured as described above,
In the state where the end portion 35'a of the switch lever 35 'is engaged with the circumferential surface 30a of the film counter 30, that is, in the normal winding state, when the protective cap is removed, as shown in FIG. The release button blocking piece 38 is placed outside the moving range of the release button 2. Therefore, the release button can be freely displaced by pressing operation,
Immediately after closing the shutter, the winding motor is driven to wind the shutter and the film for one frame. When the protective cap C is attached, the moving member 40
The protective cap C is pressed and displaced against the biasing force of the tension spring 42. The release button blocking piece 38 connected to the moving member 40 rotates counterclockwise about the pin shaft 39 according to the displacement thereof, and as shown in FIG.
Enters into the range of movement of the stepped portion 2a. Therefore, the movement of the release button 2 in the pressing direction is prevented, and it is possible to prevent the risk of taking an image with the protective cap C attached.

When the film is preliminarily wound up with the protective cap C still attached, when the back cover 23 is opened as shown in FIG. 9, the switch switching operation lever 25 causes the torsion spring 2 to rotate.
At the same time as the switch lever 35 'is rotated in the counterclockwise direction by the urging force of 7 to rotate the switch lever 35' in the clockwise direction, the film counter 30 is automatically returned in the counterclockwise direction to the position where the start symbol "S" is displayed. Stop at. In conjunction with the clockwise rotation of the switch lever 35 ′, the release button blocking piece 38 is rotationally displaced counterclockwise about the pin shaft 41 planted in the moving member 40, and the release button 2 is stepped. The moving area of the unit 2a is retreated. Therefore, the release button 2 can be pressed and moved. By the clockwise rotation of the switch lever 35 ', the movable contact piece 4c of the switching switch 4 is switched to the pre-winding contact 4b side via the shaft 36.
When the back cover is closed after loading a new film, the switch switching operation lever 25 rotates clockwise, but since the switch lever 35 'comes into contact with the projecting portion 30b of the film counter 30, it almost rotates. Stay in that position without. Therefore, the movable contact piece 4c of the switching switch 4 is placed in a state of being in contact with the pre-winding contact 4b side, and by pressing the release button 2, the protective cap C is attached and the film is removed. Preliminary winding can be done.

In each of the above three embodiments, the hoisting motor M ₂ is configured to perform both the normal hoisting and the preparatory hoisting, but the hoisting motor includes the normal hoisting and the preparatory hoisting. It goes without saying that the above may be performed by different winding motors. In the above embodiment, the camera mainly having the focal plane shutter is described, but the type of shutter is not limited, and the one provided in the lens such as the lens shutter or the one close to the lens. There is no problem even if it is something like a built-in shutter that is installed in the room.

Further, the switching switch (switching means) in each of the above embodiments is configured to be switched according to the movement of the back cover of the camera. However, as the displacement operation of the displacement member that is moved during the film exchange, not only the opening and closing operation of the back cover but also the operation of taking out and loading the film cartridge, the displacement operation of the film rewind button during the film exchange, or the film is performed. The switching switch (switching means) may be operated via the switch lever 35 according to the displacement of the detection member of the film presence / absence detection device that is moved during loading and rewinding. Furthermore, in the first embodiment (FIG. 1), the automatic focus detection device, in the second embodiment (FIG. 5), the camera shake limit warning device, and in the third embodiment (sixth embodiment).
In the figure), a camera having separate flash incomplete warning devices is shown, but it goes without saying that the present invention can be applied to a camera equipped with a combination of these devices. There is no.

〔The invention's effect〕

As described above, according to the present invention, the shutter release is prevented in a state where the shooting conditions are not set, such as the undetected focus of the focus detection device, the low shutter speed within the shake limit and the incomplete charging of the flash device. However, since the winding device is driven directly by pressing the release button,
It is possible to avoid wasting time such as preparing and winding the film while waiting for the solution of such photographing conditions. Since the preparatory winding is performed by pressing the release button after the film is completely loaded and the rear cover is closed, there is no risk of light leakage from the rear cover during the preparatory winding. In addition, since the normal winding is switched to the preparatory winding automatically, the preparatory winding operation is easy and the preparatory winding can be performed quickly, and the consumption of the power supply battery can be avoided.

[Brief description of drawings]

FIG. 1 is a block diagram of a first embodiment of the present invention, FIG. 2 is an electrical wiring diagram of the first embodiment based on the block diagram of FIG. 1,
FIGS. 3 and 4 are plan views of the switching mechanism in the first embodiment. FIG. 3 shows a normal winding state, and FIG. 4 shows a state in which the back cover of the camera is opened to switch to the pre-winding state.
FIG. 7 is an electric circuit diagram showing a second embodiment of the present invention, FIG. 6 is an electric circuit diagram showing a third embodiment of the present invention, and FIGS. 7 to 9 are release buttons by mounting a protective cap of a photographing lens. FIG. 7 is a plan view of a switching mechanism used in the present invention in a camera having a release button blocking mechanism for blocking the pushing operation of
The figure shows a plan view when the protective cap is installed in the normal winding state, Fig. 7A shows an enlarged view of the release button blocking mechanism in Fig. 7, and Fig. 8 shows a plan view when the protective cap is removed in the normal winding state. FIG. 9 is a plan view of the case where the back cover is opened with the protective cap attached. 2,102 ...... release button 4 ...... switching switch (switching means) 5D ...... release blocking circuit (inhibiting means) Mg ₃ ...... electromagnetic Magunetsuto (blocking means) for release inhibiting 115,201～202 ...... transistor (blocking means) 7A ...... Motor control circuit (winding means) M ₂ ...... Winding motor (winding means) 23 …… Back cover (displacement member)

Claims (2)

[Claims] 1. A shutter in connection with the closing operation of the shutter.
Winding means for starting the charge and film winding,
In a camera that has blocking means for blocking shutter release due to pressing operation of the release button while shooting conditions are not set, normal winding from the winding transfer position according to the movement of the displacement member that is moved to replace the film. A switching means for displacing to the transmission position is provided, and when the switching means is at the preparatory winding transmission position, the release signal of the release button bypasses the blocking means and is directly transmitted to the winding means via the switching means. A film winding device for a camera, characterized in that the winding means is operated. 2. The switching means (4) is a camera back cover (23).
And a film counter (30) that automatically switches back to the start position and is held in the preparatory winding transmission position until the film preparatory winding completion time. A film winding device for a camera as set forth in claim 1.