JP2001133828A - Shutter device for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute appropriate exposure adjustment by a simple structure and simple operation. SOLUTION: A cam hole 66 formed at a shutter driving lever 52 is engaged with a cam pin 51b formed at a turning lever 51. The cam hole 66 possesses a first driving cam face and a second driving cam face whose shapes are different. The displacement amount of the shutter driving lever 52 is decided by the driving cam face thereof. The shutter driving lever 52 is moved in a back- and-forth direction by a changeover lever 47, so that the engaging position of the driving cam face and the cam pin 51b is selectively switched. Thus, the displacement amount of the shutter driving lever 52 is changed, so that a diaphragm size and time (shutter speed) for which the diaphragm size is held are switched. When the turning lever 51 is kicked off by a kick-off lever 63, the shutter driving lever 52 is rocked along the shape of the driving cam face engaged with the cam pin 51b, so that shutter blades 53 and 54 are opened and closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera shutter device capable of adjusting an exposure amount by changing an aperture value and a shutter speed.

[0002]

2. Description of the Related Art A film unit with a lens is known as a simple camera of a single use type in which a photographic film is pre-loaded. This film unit with lens
Since it is a single-use type, thorough simplification of the structure and cost reduction are achieved. Specifically, a so-called kick-type shutter is adopted as the shutter device to simplify the structure. The kick-off type shutter opens and closes the shutter by urging the shutter blade to a closed position with a return spring and kicking the shutter blade in a direction opposite to the urging direction to reciprocate the shutter blade.

On the other hand, a film unit with a lens includes:
In recent years, since there is a high demand for image quality improvement, it is known that exposure can be adjusted according to a shooting environment.
As a device having the exposure adjusting function, for example, a device having an aperture adjusting function disclosed in Japanese Patent Application Laid-Open No. H08-114836 and a device having a function of adjusting a shutter speed disclosed in Japanese Patent Application Laid-Open No. 8-212147 are disclosed. is there.

In a film unit with a lens disclosed in Japanese Patent Application Laid-Open No. 8-114636, a fixed diaphragm (large diaphragm) and a small diaphragm are switched by inserting and removing a diaphragm plate provided with a small diaphragm opening on a photographing optical path. I have. Also, JP-A-8-2
In the film unit with a lens disclosed in JP-A No. 11447, a member for regulating the rotation of the shutter blade is inserted into and removed from the rotation path of the shutter blade to adjust the rotation distance of the shutter blade, thereby adjusting the shutter speed. ing. According to these, the exposure amount can be adjusted with a relatively simple structure.

[0005]

However, if the above-mentioned aperture adjustment function and shutter speed adjustment function are added and the photographer operates each of them independently, the intended exposure can be adjusted, but the photographing environment can be adjusted. In order to operate these appropriately according to the conditions, the photographer needs to know the meaning of the aperture and the shutter speed. However, many users who use a simple camera such as a lens-fitted film unit are unfamiliar with such operations, and it is problematic to allow the user to individually select the aperture and shutter speed according to the shooting environment. There is. Further, there is a disadvantage that the structure becomes complicated and the manufacturing cost increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it is an object of the present invention to provide a camera shutter device capable of performing appropriate exposure adjustment according to a shooting environment with a simple structure and a simple operation. Aim.

[0007]

In order to achieve the above-mentioned object, a camera shutter device according to the present invention comprises: a shutter blade comprising a plurality of blades; A rotating member that rotates in reverse by the return spring and returns to the initial position, one end of the rotating member engages with the rotating member, and the other end engages with the shutter blade, and swings to one side by the normal rotation of the rotating member. A shutter drive member that opens all the blades at once and swings to the other by the rotation of the rotating member to close the plurality of blades at once, and an engagement portion between one end side of the shutter drive member and the rotating member. A plurality of cam means provided so that the amount of displacement of the shutter driving member due to the forward rotation of the rotating member is set to be different from each other; Engage with one end of shutter drive member to select Switching means for displacing the shutter driving member in conjunction with the forward rotation of the rotating member under the set cam means, and a maximum aperture diameter formed by a plurality of blades during the forward rotation of the rotating member. And at least one of the time during which the maximum aperture diameter is maintained is changed according to the selection of the cam means.

According to a second aspect of the present invention, in the camera shutter device, the plurality of cam means are formed at one end of a shutter driving member, and the shutter driving member is swung by pressing a pin provided on a rotating member. A plurality of driving cam surfaces, each of which is provided at a different position in a thickness direction orthogonal to a swing direction of the shutter driving member, and wherein the switching means moves the shutter driving member in the thickness direction. The drive cam surface with which the pin is engaged is switched.

According to a third aspect of the present invention, there is provided a camera shutter device, wherein each of the drive cam surfaces includes a swing cam surface for swinging a shutter drive member so as to open the shutter blades when pressed by the pins. And a holding cam surface that is formed so as to be continuous with the swing cam surface and along the movement path of the pin, and that holds the shutter drive lever that has been swung by the swing cam surface at the swing position. The swing cam surface has a different length for each drive cam surface, and the maximum aperture diameter changes when the drive cam surface engaged with the pin is switched.

According to a fourth aspect of the present invention, in the camera shutter device, at least one of the plurality of driving cam surfaces is brought into contact with a pin that moves with the forward rotation of the rotating member, so that the rotating member rotates forward. And a time period during which the maximum aperture diameter is maintained when the drive cam surface engaged with the pin is switched is changed.

According to a fifth aspect of the present invention, in the camera shutter device, two cam units are provided, and the switching unit selects a cam unit that increases an exposure amount in conjunction with turning on a built-in strobe. Things.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 2, a finder objective window 12 is provided in front of a film unit 11 with a lens.
And a photographing window 14 exposing the photographing lens 13. Beside this shooting window 14, there is a strobe switch 1
6 is provided, and a strobe light emission window 17 is provided above it. The strobe switch 16 is slidably mounted between two positions, a strobe charging ON position and a strobe charging OFF position.

The flash switch 16 is linked with a switching lever (47) for adjusting the exposure value. By turning on / off the flash switch 16, the aperture and the shutter speed are respectively switched. The combination of the aperture value and the shutter speed at each position is preset, and when the flash switch 16 is turned off, the aperture value is F16 and the shutter speed is 1/240 s.
When the strobe switch 16 is turned on, the aperture value is F8 and the shutter speed is 1 /.
The combination is set to 60 seconds. When performing flash photography, the brightness of the subject is generally considered to be low. Therefore, the exposure is set to be larger when the flash switch 16 is turned on than when the flash switch 16 is turned off. These values may be other values, and are appropriately selected according to the sensitivity of the photographic film to be used.

A shutter button 18, a film counter window 19, and a strobe charging completion display window 21 are formed on the upper surface of the film unit 11 with a lens, and a winding knob 22 and a finder eyepiece window (FIG. Reference numeral 23) is provided.

As shown in FIG. 3, the film unit with lens 11 has an exposure unit 26 and a strobe device 27 at the center.
And a unit body composed of a front cover 31 and a rear cover 32, which are put on the front and back of the main body 29, and a cartridge 33 and a photographic film 34 drawn out of the cartridge 33 and formed into a roll.

Cartridge 33 and photographic film 34
Is a cartridge storage chamber 29 formed in the main body base 29.
a and the film storage unit 29b are preliminarily incorporated into the film unit with lens 11 at the time of manufacture. Below the rear cover 32, bottom lids 32a and 3 cover the bottom openings of the cartridge storage chamber 29a and the film storage chamber 29b in a light-tight manner.
2b are integrally formed. The bottom cover 32a is opened when the cartridge 33 in which the photographed photo film 34 has been taken in is taken out.

The hoisting knob 22 is attached to the upper part of the cartridge storage chamber 29a, and a hoisting shaft integrally formed on the lower surface thereof engages with the spool of the cartridge 33. By rotating the winding knob 22 for each photographing, the photographed film 34 having been photographed is wound into the cartridge 33 one frame at a time. The shutter mechanism incorporated in the exposure unit 26 is charged for the next photographing operation in conjunction with the winding of one frame of the film.
When the frame feeding is completed, the rotation of the winding knob 22 is locked by a lock lever incorporated in the exposure unit 26.

Above the exposure section 26, a finder mechanism is assembled in addition to a shutter mechanism and a winding mechanism. An exposure frame is formed on the back surface of the exposure unit 26, and limits the exposure range for one frame on the front surface of the photographic film 34 sent to the shooting position.

As shown in FIG. 4, the strobe device 27 is
It comprises a circuit board 38 on which circuit components such as a main capacitor 36, a synchro switch 37, and a step-up coil are mounted, a light emitting unit 39 including a strobe discharge tube and a reflector, and a power supply battery 41 (see FIG. 3). A circuit pattern is printed on the circuit board 38 and various circuit elements are attached to form a strobe circuit. On the front surface of the circuit board 38, a pair of contact pieces 42 is provided.

The strobe switch 16 is slidably mounted on the front surface of the circuit board 38 via a receiving plate 43. On the back surface of the strobe switch 16, an operation switch 44 for conducting the contact piece 42 is provided. Is attached. When the strobe switch 16 is slid to the ON position, the operation switch 44 conducts between the contact pieces 42 to start strobe charging.

The strobe switch 16 is provided with a pressing portion 46. The pressing portion 46 is provided with the switching lever 4.
7 is to rotate the lever 47 by contacting the lever 7. The switching lever 47 is connected to the dark box base 4.
8 so as to be rotatable. When the strobe switch 16 is moved to the ON position, the tapered pressing surface 46a presses one end 47a of the switching lever 47 to rotate the lever 47 clockwise as viewed from above.

The other end 47b of the switching lever 47 contacts the shutter drive lever 52 and functions as a holding portion for holding the position of the lever 52. The shutter drive lever 52 is urged forward by a spring 55. For this reason,
When the switching lever 47 rotates clockwise, the other end 47 is rotated.
b presses the shutter drive lever 52 against the bias of the spring 55, and moves the lever 52 backward. On the contrary, when the strobe switch 16 is moved to the off position, the switching lever 47 is pressed by the shutter driving lever 52 at the other end 47b thereof.
It rotates counterclockwise along the inclination of a.

The exposing section 26 is based on a dark box base 48 which is formed to protrude in the shape of a rectangular tube toward the front of the main body base 29, and has a shutter opening 48a formed on the front surface thereof. In front of the dark box base 48, a rotating lever 51,
Shutter drive lever 52, two shutter blades 53, 5
4, a switching lever 47 is provided, and these are
It is covered by a shutter cover 56 provided with the taking lens 13.

The two shutter blades 53 and 54 have holes 53b and 54b respectively formed therein.
b, 54b and pin 5 provided on shutter cover 56
7 and 58 are engaged with each other, and are rotatably mounted around the pins 57 and 58 as central axes. A cutout is formed in each of the shutter blades 53 and 54, and an aperture is formed by being partitioned by the cutout. The shutter opening 48a is opened according to the diameter of the aperture opening.

The shutter blades 53 and 54 have elongated holes 53.
c, 54c are formed, and the elongated holes 53c, 54c
And a drive pin 52a provided on the shutter drive lever 52
Are engaged. The shutter drive lever 52 is
And is swingably attached to the pin 64. When the shutter drive lever 52 swings, the drive pin 52a is displaced, and the shutter blades 53 and 54 open and close.

Since the aperture diameter is determined by the opening amounts of the shutter blades 53 and 54, the maximum aperture diameter is determined by the swing amount of the shutter drive lever 52. The shutter drive lever 52 is driven by the rotation lever 51.

As shown in FIG. 1, the rotating lever 51 is attached to a shaft 61 provided on the front surface of the dark box base 48,
The shaft 61 is rotatable about a center axis. With the release operation, the pressed portion 51 a provided above the rotating lever 51 is kicked off by the kicking lever 63, and rotates forward in the clockwise direction against the bias of the return spring 62. A return spring 62 is attached to the rotating lever 51 so as to reverse the counterclockwise direction when viewed from the front. When the rotation lever 51 reaches a position where the normal rotation ends, the rotation lever 51 reversely rotates toward the initial position by the bias of the return spring 62.

The stopper 60 is for restricting the rotation of the rotating lever 51 in a reverse direction. The position (the position shown in FIG. 1A) regulated by the stopper 60 is the initial position of the rotating lever 51. . A cam pin 51b that engages with the shutter drive lever 52 is provided below the rotation lever 51.
The cam pin 51b engages with the shutter drive lever 52.

At one end of the shutter drive lever 52, a cam hole 66 is formed.
1b is engaged. The cam hole 66 regulates the swing amount of the shutter drive lever 52 and the rotation amount of the rotation lever 51, and the aperture diameter and the shutter speed are determined by the shape of the cam hole 66.

As shown in FIGS. 5 and 6, two sets of driving cam surfaces, a first driving cam surface 67 and a second driving cam surface 68, are formed on the inner periphery of the cam hole 66. First drive cam surface 6
7 and the second drive cam surface 68
Are provided at different positions in the thickness direction orthogonal to the direction in which the. Therefore, when the shutter drive lever 52 is moved in the front-rear direction (thickness direction), the engagement position between the cam pin 51b and the cam hole 66 is selectively switched between the first drive cam surface 67 and the second drive cam surface 68. Is switched to. Thus, the aperture and the shutter speed are switched to perform the exposure adjustment.

That is, when the flash switch 16 is set to the off position, the shutter drive lever 52 moves forward, so that the first drive cam surface 67
Engage with. On the other hand, when the flash switch 16 is set to the ON position, the shutter drive lever 52 moves backward, so that the second drive cam surface 68 engages with the cam pin 51. First drive cam surface 67 and second drive cam surface 68
Are the first and second swing cam surfaces 67a, 68, respectively.
a, the first and second holding cam surfaces 67b, 68b,
It comprises first and second regulating surfaces 67c, 68c.

First and second swing cam surfaces 67a, 68
“a” is for swinging the shutter drive lever 52 to open and close the shutter blades 53 and 54. When the rotation lever 51 starts normal rotation by the shutter release, the cam pin 51b presses the first swing cam surface 67a or the second swing cam surface 68a, and the shutter drive lever 52 receiving this push rotates the counterclockwise. Rocks in the direction.

By this swing, the drive pin 52a is displaced to open the shutter blades 53 and 54. This opening operation is performed by the cam pin 51b and the first swing cam surface 67a.
Alternatively, the operation is continued while the second swing cam surface 68a is in contact with the second swing cam surface 68a. While the contact continues, the shutter blades 53 and 54 rotate in the opening direction, so that the maximum aperture diameter is determined by the respective lengths of the first swing cam surface 67a and the second swing cam surface 68a. Is done. When the surface engaged with the cam pin 51b is switched between the first drive cam surface 67 and the second drive cam surface, the first aperture is changed so that the maximum aperture diameter changes.
The swing cam surface 67a and the first swing cam surface 68a have different lengths.

The first and second holding cam surfaces 67b, 68
“b” is formed so as to be connected to the first and second swing cam surfaces 67a and 68a and along the movement path of the cam pin 51b. Therefore, when the rotating lever 51 rotates forward, the first and second holding cam surfaces 67b and 68b are respectively connected to the first swing cam surface 67a or the second swing cam surface 68a. After the contact with the cam pin 51b is completed, the contact with the cam pin 51b is started, and the shutter drive lever 52 rocked by each of the rocking cam surfaces 67a, 68a is held at the rocking position. While the shutter drive lever 52 is held, the maximum aperture is held.

The first and second regulating surfaces 67c, 68c
The rotation lever 51 is disposed on the rotation path of the rotation lever 51 and serves to regulate the rotation of the rotation lever 51 in the forward direction. The first and second restriction surfaces 67c and 68c are arranged at different positions so that the time during which the maximum aperture is maintained varies.

As described above, since the first drive cam surface 67 and the second drive cam surface 68 are formed in different shapes, respectively, by switching the engagement with the cam pin 51, the respective maximum aperture diameters are reduced. And the time during which this maximum aperture diameter is maintained changes. That is, when the cam pin 51 and the first drive cam surface 67 are engaged, a combination of the aperture value of F16 and the shutter speed of 1/240 sec (EV value =
16) is set. On the other hand, when the cam pin 51 and the second drive cam surface 68 are engaged, a combination of an aperture value of F8 and a shutter speed of 1/60 sec (EV value = 12)
Is set to

Next, the operation of the above configuration will be described with reference to FIG. When the wind-up knob 22 is turned, the photographic film 34 is wound up by one frame and set on the exposure frame. At the time of winding, a shutter charge is performed, and at the same time, the rotation of the winding knob 22 is locked. As shown in FIG. 7A, when the flash switch 16 is in the off position, the cam pin 51b engages with the first drive cam surface 67.

After framing, the shutter button 18 is depressed to take a picture. When the shutter button 18 is depressed, the rotating lever 51 is kicked off by the kicking lever 63 and starts normal rotation. By this forward rotation, the cam pin 51b presses the first swing cam surface 67a to swing the shutter drive lever 52 counterclockwise. With this swing, the drive pin 52a is displaced to open the shutter blades 53 and 54, and the shutter opening 48a is gradually opened from its center position.

By the start of this opening operation, subject light enters the interior of the dark box from the shutter opening 48a, and exposure of the photographic film 34 is started. Shutter blades 53, 54
The opening operation of the first swing cam surface 67a and the cam pin 5
1b. As shown in FIG. 7B, when the contact between the first swing cam surface 67a and the cam pin 51b ends, the swing of the shutter drive lever 52 ends, and the opening operation of the shutter blades 53, 54 also ends. I do. When the opening operation of the shutter blades 53 and 54 is completed,
It becomes the maximum aperture.

Further, when the rotating lever 51 rotates forward, the cam pin 51b engages with the first holding cam surface 67b.
As shown in FIG. 7C, the first holding cam surface 67b
Is on the rotation path of the cam pin 51b, so that the first holding cam surface 67b changes the posture of the shutter drive lever 52 determined by the first swing cam surface 67a while the engagement of the two continues. Hold. Thereby, the maximum aperture diameter is maintained. When the maximum aperture is reached, the pressing portion 51c turns on the synchro switch 37. However, since the strobe switch 16 is turned off and the strobe is not charged, no strobe light is emitted.

As shown in FIG. 7D, the cam pins 51d
Is in contact with the first regulating surface 67c, the forward rotation of the rotating lever 51 is regulated, and the reverse rotation is started by the bias of the return spring 62. The maximum aperture is held while the cam pin 51d is in contact with the first holding cam surface 67b. When the contact between the cam pin 51d and the first holding cam surface 67b ends, the shutter drive lever 52 swings clockwise. With this swing, the shutter blades 53 and 54 start the closing operation, and the shutter opening 48a is gradually closed. When the rotation lever 51 reaches the initial position, the swing of the shutter drive lever 52 stops, the shutter opening 48a is fully closed, and the exposure of the photographic film 34 ends. F value is F
16. Since the shutter speed is set to 1/240 sec, a proper exposure amount is given to the photographic film 34.

When shooting at night or indoors, flash photography is performed. When the flash switch 16 is slid to the ON position, flash charging starts. At the same time, the switching lever 47 rotates, and in conjunction with this, the shutter drive lever 52 moves forward. As a result, FIG.
As shown in (E), the drive cam surface with which the cam pin 51 engages is switched to the second drive cam surface 68.

The rotation lever 51 rotates forward by the shutter release. The cam pin 51b is moved to the second swing cam surface 68a.
Is pressed to swing the shutter drive lever 52. Second
Since the swing cam surface 68a is formed longer than the first swing cam surface 67a, the shutter drive lever 52
Swings more. Thereby, the shutter blade 5
The opening amount of 3, 54 also increases, and the maximum aperture diameter increases.

As shown in FIG. 7G, the cam pins 51b
When the contact between the shutter drive lever 52 and the second swing cam surface 68a is completed, the swing of the shutter drive lever 52 stops, and the aperture reaches the maximum aperture. When the rotation lever 51 further rotates forward, the cam pin 51d is engaged with the second holding cam surface 68b. While this engagement continues, the shutter drive lever 52 does not swing.
Thereby, the maximum aperture diameter is maintained. While the maximum aperture is maintained, the pressing piece 51c turns on the synchro switch 37 to perform strobe light emission.

As shown in FIG. 7H, the cam pins 51b
Comes into contact with the second regulating surface 68c, and when the forward rotation of the rotating lever 51 ends, the rotating lever 51 starts reverse rotation by the bias of the return spring 62. The second regulating surface 68c is
Is formed at a position where the amount of rotation of the rotation lever 51 is larger than that of the restriction surface 67c, so that the shutter speed becomes longer. Cam pin 51b and second holding cam surface 68b
Is completed, the shutter drive lever 52 is swung clockwise to gradually close the shutter opening 48a and eventually close it completely. Since the F value is set to F8 and the shutter speed is set to 1/60 sec, the photographic film 3
4 is given an appropriate exposure.

The shutter blades are replaced with two shutter blades 53,
Since the shutter 54 is opened from the center position of the shutter opening 48a, the exposure is performed uniformly over the entire exposure screen. Therefore, there is no exposure unevenness in the screen.

Also, the first and second holding cam surfaces 67
b, 68b, the shutter blades 53, 5
Since the time during which the maximum aperture is maintained (effective exposure time) can be lengthened out of the total exposure time in which one exposure is completed by opening and closing the shutter 4, the shutter efficiency can be improved.

In the above example, an example was described in which both the maximum aperture diameter and the time during which the maximum aperture diameter was maintained were changed. However, the shutter drive lever 71 having the cam hole 72 shown in FIG. Alternatively, the time during which the maximum aperture diameter is maintained may be changed without changing the maximum aperture diameter.

In this example, the first drive cam surface 73 is formed on the front side and the second drive cam surface 74 is formed on the rear side, and the swing cam surfaces 73a, 74a are formed to have the same length. I have. On the other hand, since the regulating surfaces 73c and 74c are arranged at different positions, the positions for regulating the forward rotation of the rotating lever 51 are different. Therefore, the first drive cam surface 73 and the second
When the drive cam surface 74 is switched, the maximum aperture diameter is the same, but the time during which the maximum aperture diameter is maintained changes, and the exposure amount changes.

In this case, as shown in FIG.
The pressing surface 76a of the strobe switch 76 is used in the first example (FIG.
Conversely, the upper part may be formed in a tapered shape so that the upper part protrudes forward from the lower part. By doing so, the cam pin 51b can be exposed without a significant change to the configuration of the first example so that the amount of exposure is increased when the strobe light is emitted, while the amount of exposure is reduced when the strobe light is not emitted. And the shutter drive lever 71 can switch the engagement position.

That is, when the strobe switch 76 is set to the off position (the position shown by the two-dot chain line), one end 47a of the switching lever 47 is pressed against the pressing surface 76a.
, The shutter drive lever 52 moves rearward. Therefore, the first drive cam surface 73 and the cam pin 51b are engaged. When the strobe switch 76 is slid from this state toward an on position (not shown) above the off position, the switching lever 47 is moved.
Rotates counterclockwise as viewed from above, so that the shutter drive lever 52 moves forward.

Therefore, the second drive cam surface 74 and the cam pin 51b are engaged. Thus, the strobe switch 7
When the switch 6 is turned off, the time during which the maximum aperture is maintained is reduced, while when the strobe switch 76 is turned on, the time during which the maximum aperture is maintained is switched.

Contrary to the second example, only the maximum aperture may be changed without changing the time during which the maximum aperture is maintained. As described above, the driving cam surface is used as the cam means, and the driving cam surface is constituted by the swing cam surface, the holding cam surface, and the regulating surface.
By changing the shape of these cam surfaces, it is possible to easily set the maximum aperture and the time during which the maximum aperture is maintained.

In the above example, the switching lever is provided as the switching means, and the mechanical switching is described. However, for example, an electromagnet or the like may be provided to perform the electrical switching. Good. In the above example, the switching lever is linked to the strobe switch.
The switching lever may not be linked, and the switching lever may be operated independently. Further, in the above example, the exposure amount (EV value) can be adjusted in two steps.
You may make it adjustable more than a step.

In this embodiment, the difference between the EV values (exposure amounts) that changes with this switching is 4 EV as described above. However, it is needless to say that the difference may be larger or smaller than 4 EV. May be. It is preferable that the difference between the EV values (exposure amounts) is set to about 2 EV to 6 EV. Considering the amount that can be corrected when printing a photographic film, if the EV value can be switched within this range, it is possible to properly print most subjects from low-luminance subjects to high-luminance subjects. It becomes possible.

In the above example, a film unit with a lens has been described. However, the film unit with a lens may not be used. For example, a simple type compact camera may be used.

[0057]

As described above in detail, the camera shutter device of the present invention has a shutter blade composed of a plurality of blades, and has a return spring after normal rotation in response to a shutter release operation. A rotating member that is rotated in reverse to return to the initial position, one end of the rotating member is engaged with the rotating member, and the other end is engaged with the shutter blade. A shutter drive member that opens simultaneously and swings to the other by the reversal of the rotation member to simultaneously close the plurality of blades; and a shutter drive member provided at an engagement portion between one end side of the shutter drive member and the rotation member. A plurality of cam means which are set so that the displacement amounts of the shutter driving member due to the forward rotation of the moving member are different from each other; and one of the plurality of cam means is selected and the rotation member and the shutter driving member are selected. Engage with one end,
Switching means for interlocking the shutter driving member with the forward rotation of the rotating member under the selected cam means, and a maximum aperture diameter formed by a plurality of blades while the rotating member rotates forward; Since at least one of the time at which the maximum aperture diameter is maintained is changed according to the selection of the cam means, a simple structure and a simple operation allow appropriate exposure adjustment according to the shooting environment. It can be carried out.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a rotating lever, a shutter driving lever, a shutter blade, and a switching lever.

FIG. 2 is an overall perspective view of a film unit with a lens.

FIG. 3 is an exploded perspective view of the film unit with a lens.

FIG. 4 is a perspective view showing an exposure unit and a strobe device.

FIG. 5 is a rear perspective view of a shutter drive lever.

FIG. 6 is a rear view of the shutter drive lever.

FIG. 7 is an explanatory diagram showing operations of a rotating lever, a shutter driving lever, and a shutter blade.

FIG. 8 is an explanatory diagram of a shutter drive lever that changes only a shutter speed.

[Explanation of symbols]

 47 switching lever 51 rotating lever 52 shutter drive lever 53, 54 shutter blade 66 cam hole 67 first drive cam surface 68 second drive cam surface 67a, 68a swing cam surface 67b, 68b holding cam surface 67c, 68c regulating surface

Claims (5)

[Claims] 1. A shutter member comprising a plurality of blades, a rotating member which rotates in a normal direction in response to a shutter release operation, and then reversely rotates to return to an initial position by the bias of a return spring. The other end of the rotating member is engaged with the shutter blade, swings to one side by the forward rotation of the rotating member, and simultaneously opens a plurality of blades, and swings to the other side by the reverse rotation of the rotating member. A shutter driving member for simultaneously closing the blades, and a shutter driving member provided at an engagement portion between one end side of the shutter driving member and the rotating member so that the amounts of displacement of the shutter driving member due to the forward rotation of the rotating member are different from each other. A plurality of cam means set in the above, one of the plurality of cam means is selected, and the rotating member and one end side of the shutter driving member are engaged with each other, and under the selected cam means, A shutter that interlocks the shutter drive member with the forward rotation of the rotating member At least one of a maximum aperture diameter formed by a plurality of blades while the rotating member rotates normally, and a time during which the maximum aperture diameter is held, for selecting the cam means. A shutter device for a camera, wherein the shutter device is changed in response to the change. A plurality of cam means formed on one end side of a shutter driving member, and a plurality of driving cam surfaces for swinging the shutter driving member by pressing a pin provided on a rotating member; The drive cam surfaces are provided at different positions in the thickness direction orthogonal to the swing direction of the shutter drive member, and the switching means moves the shutter drive member in the thickness direction to switch the drive cam surface with which the pins engage. 2. A shutter device for a camera according to claim 1, wherein 3. A swing cam surface for swinging a shutter drive member so as to open a shutter blade in response to pressure of the pin, and a drive cam surface connected to the swing cam surface for moving the pin. A holding cam surface which is formed along the path and holds the shutter drive lever rocked by the rocking cam surface at its rocking position, and wherein each rocking cam surface has a different rocking cam surface. 3. The camera shutter device according to claim 2, wherein the maximum aperture diameter changes when a drive cam surface engaged with the pin is switched. 4. At least one of said plurality of drive cam surfaces is provided with a regulating surface which abuts on a pin which moves with the forward rotation of the rotating member and regulates the forward rotation of the rotating member. 4. The camera shutter device according to claim 2, wherein a time during which the maximum aperture diameter is maintained changes when a driving cam surface to be engaged is switched. 5. The apparatus according to claim 1, wherein two cam means are provided, and said switching means selects a cam means for increasing an exposure amount in conjunction with turning on a built-in strobe. Or a shutter device for a camera according to the above.