JPS6339694Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a switching device for bulb photography of a camera shutter.

In keeping with the purpose of portable cameras, it is preferable for them to be smaller. Especially in recent years, due to the rise in manufacturing costs and other costs, in order to provide cameras at low prices, it is necessary to make the entire camera mechanism more compact than the conventional one. It is desired to simplify things, realize miniaturization, and provide a camera that is less expensive.

In other words, if a conventional camera is made proportionally smaller in size, including each component, the desired purpose can be achieved, but unless the machining accuracy of each component is improved, the quality will deteriorate and the performance will decrease. In order to maintain this, component precision must be improved. Also,
If the conventional mechanism is miniaturized as it is, the distances between the parts will become close to each other, which will complicate the assembly process. The above-mentioned problems result in increased manufacturing costs and camera failure, which is undesirable for camera users.

In view of the above, in order to provide a compact camera at a low price, the present invention reduces the number of parts by making the parts that make up the mechanism multi-functional, and the space of the reduced parts is used for miniaturization. The mechanism is intended to be constructed in such a way that the

The bulb photography switching device for a camera shutter according to the present invention comprises an opening member 3 for opening a shutter opening 1a to start exposure, a closing member 5 for closing said opening 1a to end exposure, an opening claw 4 and a closing claw 6 for locking each of said members in a charge position, a control member 7 which is released by a shutter release operation to control exposure time and which sequentially releases said opening member 3 and closing member 5, a governor device 16-23 having a switching portion 24a for switching between gear trains with different gear ratios and which engages with said control member 7 to delay the operation of said control member 7, and a governor device 16-23 for switching between gear trains with different gear ratios.
the valve release member 25 is adapted to move from the first position to the second position and to engage with the switching portion 24a of the first position to the second position and to switch the gear train, and to operate the valve photographing in a first position and a second position, the valve release member 25 being adapted to move from the first position to the second position and to move from the first position to the second position, the valve release member 25 being adapted to move from the first position to the first position and to move from the first position to the first position, the valve release member 25 being adapted to move from the first position to the first position and to move from the first position to the second position, the valve release member 25 being adapted to move from the first position to the first position and to move from the first position to the second position.

Further, the switching member is configured to lock a part of the governor device, the control member, the closing pawl, the closing member, or the interlocking lever in the second position. It constitutes the shutter's bulb photography switching device.

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

In FIG. 1, a shutter opening 1a for exposure is formed in a shutter substrate 1, and is covered by an open blade (not shown). Further, a closing blade (not shown) is housed in the upper end 1b of the opening 1a and stands by for the end of exposure. Each of the blades is
It is supported so as to be movable in a plane parallel to a receiving plate 2 which has the same shape as the shutter board 1 and is supported in parallel to the board.

The opening member 3 is rotatably connected to the substrate 1 by a shaft 3a.
and is biased by a right-hand swing spring (not shown). In addition, a pin 3b is provided at the lower right part of the opening member 3.
protrudes upward, and a curved portion 3c protrudes upward at the right end. The opening member 3 is also operatively connected to actuate opening vanes (not shown) in a known manner.

The opening claw 4 is supported on the substrate 1 by a shaft 4a,
It is rotatably supported by a left turning spring (not shown). Further, the opening claw 4 has a protrusion 4c that locks the curved portion 3c of the opening member 3 in the charge position by a hook portion 4b and extends downward.

The closing member 5 is rotatably connected to the base plate 1 by a shaft 5a.
and is biased by a right-hand swing spring (not shown). Further, the closing member 5 has a hook portion 5b formed at its right end, and is operatively connected to operate a closing blade (not shown) in a known manner.

The closing claw 6 is supported on the base plate 1 by a shaft 6a,
It is rotatably supported by a right-hand swing spring (not shown), and includes a curved portion 6b that locks the hook portion 5b of the closing member 5 in the charge position, and an operating curved portion 6c.

The control member 7 is rotatably supported on the base plate 1 by a shaft 7a, and is biased by a left rotation spring (not shown). It also includes a stepped portion 7b having an inclined surface on the outer periphery, a pushing portion 7c projecting upward, a projection 7d engaging with the projection 4c of the opening claw 4, and a pushing portion 7e projecting upward. There is.

A control board 8 is fixed to the board 1 by a known method so as to cover each of the above-mentioned members, and a rising shelf portion 8a is formed on the control board 8, which is perpendicular to the operating plane of each of the above-mentioned members. In addition, although the control board 8 is partially cut out to show the operating range of each of the above-mentioned members and each member described later, this will not be described in detail.

The control pawl 9 is pivotally supported by a shaft 9a on the back surface of the control board 8, and is biased by a left rotation spring (not shown). It also includes a slope 9b for restraining the stepped portion 7b of the control member 7 in the charge position and a claw portion 9c.

The release lever 10 is rotatably supported by the control board 8 via a shaft 10a, and is biased by a left-hand rotation spring (not shown). Furthermore, the claw portion 9c of the control claw 9
The control member 7 is provided with a curved portion 10b that engages with a stop piece (not shown), and engages a claw portion 9c of the control claw 9 in order to restrain the control member 7 in the charge position at the illustrated position.

Cam members 11a, 11b, 11 that switch the shutter control mechanism in conjunction with camera exposure time selection
Although not shown, it is attached to the shelf portion 8a of the control board 8 by a known method so as to be rotatable around an axis 11d. (See FIG. 2) The adjustment lever 12 is pivotally supported by the control board 8 by a shaft 12a, biased by a right-hand swing spring (not shown), and has a curved portion 12b that abuts against the cam member 11c.
and an arm 12c extending to the right. Further, the tip of the arm 12c is bent downward, and on the back surface of the control board 8, the interlocking lever 13 is rotatably supported on the shaft 13a.

The interlocking lever 13 has a first arm 13b that engages with the operating bend 6c of the closing claw 6, and a pin 3b of the opening member 3.
It has a second arm 13c and a protrusion 13d that engage with the second arm 13c and a protrusion 13d, and a pin 13e that engages with the protrusion 7d of the control member 7. (See FIG. 3) Since the interlocking lever 13 is supported below the release claw 4, it can be operated so that the second arm 13c and the protrusion 4c do not interfere with each other.

The switching member 14 is rotatably supported by the control board 8 by a shaft 12a, and is biased by a right-hand swing spring (not shown). The switching member 14 has a first arm 14a with a bent tip, a second arm 14d with two curved parts 14b and 14c, and a third arm 14e with a curved part that engages with the cam member 11b. have

The actuating lever 15 is rotatably supported by the control board 8 via a shaft 15a, and is biased by a left rotation spring (not shown). Further, the actuation lever 15 has a lower bent portion 15b and a bent portion 1 that contacts the cam member 11a.
5c. (See Figure 5) The governor device consists of a No. 1 gear 16 and a No. 2 gear 1.
7, an intermediate gear 18, a third gear 19, an escape wheel 20, and an anchor 21, and a second auxiliary gear 22 and a pinion 23.
It is equipped with a governor device.

The No. 1 gear 16 is rotatably supported on the control board 8 by a shaft 16a, and is connected to the bending portion 15 of the operating lever 15.
b and the pusher 7 of the control member 7.
The curved portion 1 is provided with a cam portion 16c on the back surface that engages with the curved portion 15b, a downward projection 16d, and a toothed portion 16e on the lower outer periphery.
5b is biased by a spring (not shown).

The second gear 17 has teeth around the entire circumference and is rotatably supported on the control board 8 by a shaft 17a.
A small gear 17b is formed which meshes with the small gear 17b. Further, the second gear 17 has an intermediate gear 18 and a third gear 1.
The small gear 19b formed at 9 meshes with the small gear 19b.

The intermediate gear 18 and the third gear 19 are connected to the shaft 18a.
and 19a are rotatably supported on the intermediate lever 24.

The intermediate lever 24 is rotatably supported by the control board 8 below the second gear 17 by a shaft 17a, and has a protrusion 24a that engages with the curved portion 14b of the switching member 14.
and a curved portion 24b that engages with the push portion 7c of the control member 7.
and is biased by a left turning spring (not shown).

The escape wheel 20 is rotatably supported on the control board 8 by a shaft 20a, and teeth formed around the entire circumference are
Can mesh with the intermediate gear 18, and is always connected to the pallet 20.
It meshes with the. Further, a small gear 20b is formed below the escape wheel 20, and can mesh with the entire circumferential teeth of the third gear 19. In the illustrated charge state, the curved portion 24b of the intermediate lever is Since they are turned to the right by the pushing portion 7c, the third gear 19 and the intermediate gear 18 do not mesh with either the small gear 20b or the escape wheel 20.

The pallet pallet 21 is swingably supported by the control board 8 via a shaft 21a. In addition, escape wheel 20
The engagement between the pallet and pallet pallets 21 is well known and will not be described in detail. (See Figure 2) The auxiliary gear 22 is rotatable by the shaft 16a.
It is supported by the lower part of the No. 1 gear 16, is biased by a left turning spring (not shown), and comes into contact with the protrusion 8b of the control board 8 and stops. Further, the auxiliary gear 22 includes a pushing arm 22a that engages with the protrusion 7d of the control member 7, an upper toothed portion 22b, and a protrusion 22c that engages with the first arm 14a of the switching member 14. (See FIG. 4) The pinion 23 meshes with the teeth 22b of the auxiliary gear 22, is operated by the shaft 15a, and is rotatably supported by the control board 8 below 15-15.

The pin 25 is a valve release member that engages with the second arm 14d of the switching member 14 and is linked to the camera release.

The illustrated embodiment shows a charge state in which the shutter is set to an exposure time of 1 second.

Next, a method of operating the shutter by the release operation of the camera will be explained.

When the release lever 10 is rotated to the right around the shaft 10a against a spring (not shown) from the state shown in FIG. 1 in conjunction with the camera release, the curved portion 10b
Since the pawl portion 9c locked to is released, the control pawl 9 is pushed on the slope 9b by the stepped portion 7b of the control member 7 around the shaft 9a against a spring (not shown), and rotates to the right. do.

The control member 7 is connected to the shaft 7a by a spring (not shown).
As the pushing part 7c releases the pressure on the curved part 24b of the intermediate lever 24, the intermediate lever 24 turns to the left around the shaft 17a by a spring (not shown), and the third gear 19 and the escape wheel 20 At the position where the small gear 20b and the small gear 20b are properly meshed, it comes into contact with a known stop piece (not shown) and stops.

When the control member 7 further rotates, the protrusion 7d pushes the protrusion 4c of the release pawl 4, and the release pawl 4 is rotated around the shaft 4a by a spring (not shown) until the hook portion 4b and the curved portion 3b are disengaged. Turn against it and turn to the right.

When the release member 3 is released from the curved portion 3b,
It is rotated to the right around the shaft 3a by a spring (not shown), operates an opening blade (not shown), opens the opening 1a, and starts exposure. In the state shown in FIG. 1, the pin 3b is connected to the convex portion 13d of the interlocking lever 13
It does not engage with the arm 13c.

Furthermore, when the control member 7 turns to the left, the protrusion 7d engages with the pushing arm 22a of the auxiliary gear 22, and the auxiliary gear 2
2 is rotated to the right around the shaft 16a against a spring (not shown), and at the same time the pinion 23 is rotated by the tooth portion 22b, the pushing arm 7e engages with the cam portion 16c of the No. 1 gear 16, and the The gear 16 is rotated to the right around the shaft 16a against a spring (not shown), and the pinion 17b, the second gear 17, the pinion 19b, the third gear 19, the pinion 20b, and the escape wheel 20 are rotated. , swings the ankle 21.

When the exposure time of 1 second has passed, the pushing part 7e escapes from the pushing area of the cam part 16c and instantly turns to the left.
The protrusion 7d engages with the pin 13e, and the interlocking lever 1
3 to the right around the axis 13a.

When the pin 13e of the interlocking lever 13 is pressed,
Push the operation bending part 6c of the closing claw 6 with the first arm 13b, turn the closing claw 6 to the left around the shaft 6a against a spring (not shown), and move the bending part 6b and the closing member 5.
Release the lock from the hook portion 5b. When this state is reached, the control member 7 comes into contact with a stop piece (not shown) and stops.

When the hook portion 5b of the closing member 5 is released,
It is rotated to the right around the shaft 5a by a spring (not shown), actuates a closing blade (not shown), closes the opening 1a, and completes the exposure.

The above operation completes one exposure operation, but in order to charge the shutter again, the control member 7 is moved to the shaft 7a by a known method (not shown).
The number 1 gear 16 is rotated to the right against a spring (not shown) around the
After releasing the pressure on the cam portion 16c of the cam portion 16c, the push arm 22a of the auxiliary gear 22, and the pin 13e of the interlocking lever 13, and further releasing the pressure on the protrusion 4c of the opening claw 4, the push portion 7c pushes the curved portion 24b of the intermediate lever 24. The third gear 19 and pinion gear 20b are pushed out of engagement, and the claw portion 9c is locked to the curved portion 10b of the release lever 10 at a position where the stepped portion 7b is restrained by the slope 9b of the control claw 9.

At the same time as the control member 7 is turned to the right, the opening member 3 and the closing member 5 are
However, both shafts 3a,
5a to the left, the opening blade and closing blade (not shown) are moved to the charge position without opening the opening 1a, and the curved part 3c is moved to the hook part 4 of the opening claw 4.
Then, the hook portion 5b is engaged with the curved portion 6b of the closing claw 6 to complete the charging. Needless to say, when the charging is completed, the state returns to the state shown in the figure.

If the exposure time is 1/2 or 1/4 second, cam member 1
1a, 11b, and 11c, only the operating lever 15 is turned to the left around the shaft 15a by a spring (not shown), and the bent portion 15b pushes the protrusion 16b of the No. 1 gear, causing the No. 1 gear 16 to rotate around the shaft 16a. The exposure time is adjusted to substantially the desired value by turning the cam part 16c to the right and reducing the amount by which the cam part 16c is actuated by the push part 7e of the control member 7.

Next, when the exposure time is 1/8, 1/16, or 1/30 seconds, the cam members 11a, 11b, and 11c
At the same time, the operating angle of the No. 1 gear 16 with respect to the control member 7 is adjusted via the operating lever 15, and at the same time, the intermediate lever 24 is adjusted by the curved portion 14b of the switching member 14.
The protrusion 24a of the shaft 1 is pushed, and the intermediate lever 24
7a to the right against a spring (not shown), the third gear 19 is disengaged from the escape wheel 20, and the intermediate gear 18 is brought into mesh with the escape wheel 20.

Since the intermediate gear 18 only transmits the rotation of the second gear 17 to the escape wheel 20 and does not have the effect of changing the rotation ratio, the braking effect of the pallet wheel 20 is weakened compared to the case described above.

Therefore, when the shutter is activated, the desired exposure time will be controlled.

Next, when the exposure time is 1/60 second, the cam members 11a, 11b, and 11c are used to
The number gear 16 is adjusted, and at the same time, the intermediate lever 24 is adjusted by the switching member 14 to a position where neither the number 3 gear 19 nor the intermediate gear 18 meshes with the escape wheel 20.

In this state, the ankle 20 exerts no braking action and the desired exposure time is controlled.

The method of operating the shutter in the case of the above exposure time is the same as that in the case of 1 second, so the explanation will be omitted.

Next, when the exposure time is 1/125 seconds, the cam members 11a, 11b, and 11c move the No. 1 gear 16 to the position where it exerts the maximum effect, as described above, and the No. 3 gear relative to the escape wheel 20. Both the gear 19 and the intermediate gear 18 are adjusted to positions where they do not mesh, and at the same time the curved portion 12b of the adjustment lever 12 is pushed, and the adjustment lever 12 is rotated to the left around the shaft 12a against a spring (not shown). , right end arm 12
The interlocking lever 13, which is pivotally supported by the lever 13c, is adjusted to the state shown in FIG.

In this state, the second arm 13c of the interlocking lever 13
approaches the pin 3b of the opening member 3.

Next, the operating method will be explained.
As in the second case, the control member 7 is released and the projection 7
After the release pawl 4 has released the release member 3 due to d, the control member 7 is delayed by the No. 1 gear 16.

In the meantime, the opening member 3 rotates to the right around the shaft 3a to start exposing, and at the end of its operation, the opening member 3
pushes the second arm 13c of the interlocking lever 13, rotates the interlocking lever 13 to the right around the shaft 13a, and
The arm 13b rotates the closing claw 6 to the left around the shaft 6a, and the closing member 5 is released to complete the exposure.

Next, if the exposure time is 1/250 seconds, the above 1/1
Compared to the case of 25 seconds, the interlocking lever 13 is adjusted to a position where the first arm 13b approaches the closing claw 6 further, and the convex portion 13d approaches the pin 3b. (See position 130 indicated by the dashed-dotted line in FIG. 3) When the shutter is released in this state, the release member 3 is activated and exposure is started, as in the case of 1/125 seconds, and at the initial stage of the operation. The pin 3b pushes the convex portion 13d, the interlocking lever 13 is turned to the right around the shaft 13a, the first arm 13b pushes the closing claw 6, and the closing member 5 is released to complete the exposure.

In addition, in the case of 1/125 and 1/250 seconds, the control member 7
While the protrusion 7d is being delayed by the No. 1 gear 16, the above operation is performed and the exposure is completed.
After the delay caused by the No. 1 gear 16, the control member 7 reaches a region where the protrusion 7d pushes the pin 13e.
Since the interlocking lever 13 has already finished its operation with the pin 3b, it finishes its operation without engaging the pin 13e.

Next, when the exposure time is 1/500 seconds, the adjustment lever 1 is
2 and the switching member 14 are adjusted to the same positions as in the case of 1/125 seconds, and the operating lever 15 is adjusted to the position where the No. 1 gear 16 acts on the control member 7 in the latter half of its operation.

In this state, since the protrusion 22c of the auxiliary gear 22 is not restrained by the first arm 14a of the switching member 14, the auxiliary gear 22
It comes into contact with and stops. (See Figure 4) Next, to explain the method of operation, as in the case of the shutter operation described above, the control member 7 is released and the opening member 3 is operated to start exposure, and at the same time the control member 7 is pressed. The portion 7e engages with the pushing arm 22a of the auxiliary gear 22, causing the auxiliary gear 22 to rotate to the right around the shaft 16a against a spring (not shown), while rotating the pinion 23 using the upper tooth portion 22b. Control member 7 is delayed.

However, the delay effect caused by the auxiliary gear 22 is very small, and the delay effect caused by the protrusion 7d on the pin 13e
is started, and the interlocking lever 13 moves to the shaft 13a before the pin 3b of the opening member 3 pushes the second arm 13c.
The first arm 13b operates the closing claw 6 to release the closing member 5 and complete the exposure.

The control member 7 further turns to the left and engages with the cam portion 16c of the No. 1 gear 16 by the pushing portion 7e, thereby delaying its operation and reducing its speed to stop its operation.

Note that the auxiliary gear 22 also acts on the other exposure times mentioned above, but its delay effect is slight compared to the effect of the No. 1 gear 16, so it has been omitted to simplify the explanation. .

Next, when the exposure time is 1/1000 second, the first gear 16 is
is adjusted to the same position as the 1/500 second, the adjustment lever 12 is adjusted to the same position as the 1/250 second (position 130 indicated by the dashed line in FIG. 3), and the switching member 14 is
Same position as 1/8 second above (position indicated by the dashed line in Figure 4)
and the auxiliary gear 2 is adjusted by the first arm 14a.
2 and rotate it to the right around the shaft 16a to the position shown by the dashed line in FIG. Therefore,
In the auxiliary gear 22, the pushing arm 22a moves away from the protrusion 7d, reducing the delay effect.

When the shutter is released in this state, the same operation as in the case of 1/500 second is performed, but since the delay effect on the control member 7 by the auxiliary gear 22 is small, the corresponding exposure time of 1/1000 second is controlled. In this case as well, since the interlocking lever 13 is activated by pushing the pin 13e with the protrusion 7d before the protrusion 13d is pushed with the pin 3b, a faster shutter speed is controlled.

Next, in the case of bulb photography, from the state of 1 second shown in the figure, the cam members 11a, 11b, and 11c
The switching member 14 is released from the pressure of the bent portion 14e, rotates to the right around the shaft 12a by a spring (not shown), and
The second arm 14d comes into contact with the pin 25 of the valve release member, and becomes pivotable to the position indicated by the dashed line in FIG. 5 (second position).

Next, the operating method will be explained. In conjunction with pressing down of the camera release button, the pin 25 of the valve release member separates from the second arm 14d of the switching member 14 and retreats to the position indicated by the dotted line in FIG. The switching member 14 is rotated by a spring (not shown) to the position indicated by the dashed line in FIG. 5, and the curved portion 14c enters the operating locus of the protrusion 16d of the No. 1 gear 16, and then the release lever is turned to the right.

Thereafter, as in the case of 1 second, the control member 7 starts operating the release member 3, the first wheel 16 is turned to the right, and the control member 7 is delayed. Protrusion 1
6a, the bending part 1 of the switching member 14
4c, the control member 7 is prevented from turning in that state, and the shutter remains open.

When the release button is released, the pin 25 engages with the second arm 14d again to move the switching member 14 to the second
The first gear 16 is rotated to the left around the shaft 12a from the position of
Continue turning to the right around 6a and release control member 7. Therefore, the control member 7 pushes the pin 13e with the protrusion 7d, and as in the case of the above operation, the exposure is completed and the operation is completed.

Note that in the above embodiment, the curved portion 14c is 1
Although it is configured to lock the protrusion 16d of the number gear, in order to perform the operation for bulb photography, it is not limited to the illustrated embodiment. , by locking the ankle 21, etc., or by locking any one of the control member 7, closing claw 6, closing member 5, interlocking lever 13, etc., to perform bulb photography. It is.

As is clear from the above description, the switching member 14 is
In addition to the first position for switching the gear train of the governor device that delays the control member 7, there is a second position for performing bulb photography, and either one is selectively switched by the cam member 11b. , it is possible to switch with a single cam member, and since the switching member 14 contributes to the operation by directly photographing the bulb, the number of parts is reduced compared to the conventional structure that required a valve locking member. This reduces the size of the shutter, reduces the number of failure factors, and reduces parts manufacturing and assembly costs. This makes it possible to maintain the system and provide shutters at a low price, which is highly effective.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a plan view of the main part with the shutter in a charged state, Fig. 2 is a plan view of the governor device, Fig. 3,
4 and 5 are explanatory views of parts, 3 is an opening member, 4 is an opening claw, 5 is a closing member, 6 is a closing claw,
7 is a control member, 10 is a release lever, 11 is a cam member, 12 is an adjustment lever, 13 is an interlocking lever,
14 is a switching member, and 16 to 23 are governor devices.

Claims (1)

[Scope of utility model registration request] An opening member that opens the shutter opening and starts exposure, a closing member that closes the opening and ends exposure, an opening pawl and a closing pawl that respectively lock each member in the charge position, and a shutter release operation. a control member that is released for exposure time control and sequentially releases the opening member and the closing member;
a governor device having a switching section for switching between wheel trains having different gear ratios, and engaging with the control member to delay operation of the control member; and a governor device that engages with the switching section of the governor device to switch the wheel train. a single switching member having a first position for switching and a second position for performing bulb exposures and biased from the first position to the second position;
A cam member that operates the switching member in accordance with a set exposure time, and a cam member that moves away from the operating trajectory of the switching member in conjunction with the camera release member at the bulb shooting setting position of the cam member, and In conjunction with the return, the switching member is switched to the second
a valve release member that is actuated from the second position to the first position, and when the switching member is actuated from the second position to the first position, the valve actuation is terminated and the closing member is actuated. Features a valve switching device for camera shutters.