JPH0682631U - Valve mechanism in camera shutter device - Google Patents

Abstract

(57) [Abstract] [Purpose] In a lens shutter device for a camera, which has an opening shutter blade and a closing shutter blade, and which opens and closes at least the closing shutter blade by reciprocating rotation of a closing motor, at the time of bulb shooting. Minimize the power consumed by the closing motor. [Structure] During valve photographing, when the driving ring 8 is slightly rotated rightward from the initial position by the pulse motor 19, the projection 8a pushes the pin 12a and the valve regulating member 12 moves rightward and is locked by the locking member 16. . Therefore, in the closing motor 7, the drive pin 7b is engaged with the blocking portion 12b and the right rotation is blocked. After that, the drive ring 8 is rotated counterclockwise, and the aperture diameter is set with the aperture ring 9 as in the case of normal photographing. The drive ring 8 is further rotated leftward from the aperture setting position at the end of the bulb photographing, and the projection 8b pushes the arm 16b of the locking member 16 to restore the valve regulating member 12. After that, the drive ring 8 returns to the initial position.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a valve mechanism of a shutter device for a camera, which has an opening shutter blade and a closing shutter blade, and at least the closing shutter blade is opened and closed in conjunction with a motor.

[0002]

[Prior art]

 This kind of shutter device is used for a lens shutter having a relatively large aperture for photographing. It goes without saying that the larger the aperture for photography, the greater the possibility of light leakage. Therefore, in this type of shutter device, normally, both the opening shutter blade and the closing shutter blade are placed in the closed position to enhance the light shielding effect. When the shutter button of the camera is pressed, the aperture is automatically set to a predetermined aperture position or the focus adjustment lens is set to a predetermined position by the autofocus mechanism prior to exposure of the film. . At this time, the closing shutter blades are moved from the closing position to the opening position by the closing motor, and the closing motor is kept energized to maintain its position, and the shutter exposure start preparation is completed. After that, the opening shutter blade moves to the open position by the exposure start signal, and then the closing motor is energized in the opposite direction to the above, and the closing shutter blade moves to the closing position to perform the exposure operation. finish.

In such a shutter device, since the closing shutter blade is driven by the motor, the initial operating speed of the closing shutter blade becomes slow and it is difficult to obtain good operating characteristics. It may be possible to increase the voltage applied to the motor in order to solve this problem.However, this method consumes a large amount of power, so normally a supplementary pole is provided in the closing motor and the closing motor is used in the open position. The rotor is biased in the closing direction, and the initial characteristics of the closing operation are improved when a closing signal is input to the closing motor.

[0004]

[Problems to be solved by the device]

 When performing bulb photography in such a shutter mechanism, the power to the closing motor cannot be cut off in order to ensure that the closing shutter blade waits in the open position, resulting in a very large power consumption. There is a point.

The present invention has been made in view of the above problems, and an object thereof is to minimize the power consumed by the closing motor during bulb photographing. is there.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, a valve mechanism of the present invention has a shutter blade for opening and a shutter blade for closing, and at least the closing shutter blade is operated in association with a motor to open and close a camera lens. In the shutter device, the method of setting the shooting conditions such as the diaphragm mechanism or the focus adjustment lens from the initial position by the pulse motor, the set mechanism that can reciprocate in the opposite direction, and the reverse direction of the set mechanism. A valve restricting member that is moved to a position that prevents the closing operation of the closing shutter blade against the habit of movement, and a locking member that locks the valve restricting member in the blocking position; When the setting mechanism is moved beyond the setting range in the shooting condition setting direction, the locking of the valve regulating member by the locking member is released. That.

The setting mechanism is reciprocally moved by a pulse motor to move the valve restricting member to a position that prevents the closing operation of the closing shutter blade during valve shooting, and a shooting condition setting direction from the initial position. Is preferably pushed by the drive member, and the return to the initial position is preferably configured by an imaging condition setting member that follows the drive member by its own habit.

[0008]

[Action]

 In the case of bulb photographing, the pulse motor first moves the setting mechanism in the direction opposite to the photographing condition setting direction. As a result, the valve restricting member is moved to a position that prevents the closing operation of the closing shutter blade, and at that position, it is locked by the locking member against its own habit. Next, the setting mechanism returns to the initial position by the pulse motor and moves in the shooting condition setting direction as in normal shooting to set the aperture or lens to a predetermined state. After that, the opening shutter blades are opened to enter the bulb photographing state. During this period, the closing motor that operates the closing shutter blade is not energized. When the release button of the camera is released after the desired time has elapsed, the closing motor is energized in the closing direction, while the pulse motor moves the setting mechanism in the shooting condition setting direction and moves beyond the setting range. Then, the locking of the valve regulating member by the locking member is released. Therefore, the closing motor closes the closing shutter blade, while the setting mechanism is returned to the initial position by the pulse motor.

[0009]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a plan view showing an opening / closing mechanism of a shutter blade, FIG. 2 is an enlarged view of a motor rotor for opening / closing the shutter blade, (a) is a rotor of a closing motor, and (b) is an opening motor. The rotor of the motor is shown. FIG. 3 is a plan view of an embodiment of the valve mechanism according to the present invention.

First, an example of a shutter opening / closing mechanism to which the valve mechanism of the present invention is applied will be described with reference to FIGS. 1 and 2. Reference numeral 1 denotes a shutter base plate having a photographing opening 1a, slots 1b and 1c, and shafts 1d, 1e, 1f and 1g. Numerals 2 and 3 are shutter blades for opening which are rotatably supported by pins 1d and 1e, respectively, and numerals 4 and 5 are shutter blades which are rotatably supported by pins 1f and 1g, respectively. Although omitted in order to make the drawing easier to understand, these shutter blades 2, 3, 4, and 5 are each provided with a slot for fitting with a drive pin of a motor described later. Reference numeral 6 denotes a moving magnet type opening motor attached to the back surface of the shutter base plate 1, which has a rotor 6a made of a permanent magnet and has a drive pin on a lever which rotates integrally with the rotor 6a. 6b is provided. Reference numeral 6c is a commutating pole provided on the opening motor 6 and made of a magnetic material. Reference numeral 7 is a closing motor of the same type as the opening motor 6, which is attached to the back surface of the shutter base plate 1 and has a rotor 7a, a drive pin 7b and a commutating pole 7c. The drive pins 6b and 7b pass through the slots 1b and 1c, respectively, and on the surface of the shutter base plate 1, slots (not shown) provided on the opening shutter blades 2 and 3 and the closing shutter blades 4 and 5, respectively. Is fitted to.

Next, the operation of the shutter mechanism shown in FIGS. 1 and 2 will be described. In FIG. 1, the closing shutter blades 4 and 5 are in the open position, but in the stationary state, they are in the closed position like the opening shutter blades 2 and 3, and both shutter blades provide a double shooting aperture. 1a is covered to enhance the light blocking effect. In this stationary state, the rotor 7a of the closing motor 7 is at the solid line position shown in FIG. 2A, and the rotor 7a is biased in the closing direction due to the relative relationship between the commutating pole 7c and the N pole. The rotor 6a of the opening motor 6 is at the solid line position shown in FIG. 2 (b), and is similarly biased in the closing direction in relation to the commutating pole 6c. Therefore, even if the motors 6 and 7 are not energized, it is difficult for the shutter blades to move due to vibration or the like.

When the camera is released in this state, the closing motor 7 is first energized, and the closing shutter blades 4 and 5 are shown in FIG. 1 with the drive pins 7b as the fulcrums on the shafts 1f and 1g. Moved to the open position. At this open position, the motor 7 is continuously energized in the opening direction. Since the rotor 7a is in the state shown by the broken line in FIG. 2 (a), the bias by the commutating pole 7c is open in the closing direction. This is to make the initial speed effective when the closing motor 7 is energized in the closing direction. Next, when the opening motor 6 is energized, the opening shutter blades 2 and 3 are moved to the open position by the drive pins 6b with the shafts 1d and 1e as the fulcrum, and the photographing opening 1a is opened to expose the film. Done. In this state, the rotor 6a of the opening motor 6 is in the state shown by the broken line in FIG. 2 (b), so the bias by the commutating pole 6c is in the opening direction.

After that, when the closing motor 7 is energized in the opposite direction to the above, the rotor 7a rotates clockwise in FIG. 1, and the closing shutter blades 4 and 5 are driven by the drive pin 7b. Is brought to the closed position of the photographing opening 1a, and the exposure of the film is completed. After that, the opening motor 6 is also energized in the opposite direction to the above, and the opening shutter blades 2 and 3 are also brought to a position covering the photographing opening 1a in the same manner as the closing shutter blades 4 and 5. The shooting operation of is completed.

Next, a valve mechanism effective for the above shutter mechanism will be described with reference to FIG. Although the shutter base plate 1 shown in FIG. 1 is omitted in FIG. 3, the photographing opening 1 a provided in the shutter base plate 1 and the opening motor 6 and the closing motor 6 mounted on the back surface of the shutter base plate 1 are not shown. The motor 7 is shown. Further, in practice, there is a diaphragm base plate at a position where the shutter blades 2, 3, 4, 5 are sandwiched by the shutter base plate 1, but this is also omitted. Most of the components shown in FIG. 3 are installed on this diaphragm base plate.

Reference numeral 8 denotes a drive ring, which has projections 8a and 8b, an eccentric pin 8c, and teeth 8d. A diaphragm ring 9 has seven cam grooves 9a and arms 9b. Reference numeral 10 is a diaphragm blade which actually shows only one of the seven, and has a fulcrum pin 10a supported on a diaphragm base plate (not shown) and a moving point pin 10b fitted in the cam groove 9a. is doing. Reference numeral 11 is a spring that gives the throttle ring 9 a right-handed turning characteristic, whereby the eccentric pin 8c and the arm portion 9b are normally engaged with each other. Reference numeral 12 denotes a valve restricting member that is linearly moved by being guided by the shafts 13 and 14 of the throttle base plate, and has a pin 12a that engages with the protrusion 8a and a blocking portion 12b that engages with the drive pin 7b of the closing motor 7. It has a hook portion 12c. Reference numeral 15 is a spring that biases the valve regulating member 12 to the left. Reference numeral 16 denotes a locking member that is given a right-handed turning property by a spring (not shown) on the shaft 17 of the drawing base plate, and includes a locking portion 16a that engages with the key portion 12c and an arm that abuts on the protrusion 8b. And a portion 16b. Reference numeral 18 denotes a shaft which is provided on the drawing base plate and serves as a stopper against the clockwise rotation of the locking member 16. A pulse motor 19 is attached to a holding plate (not shown) that is present in front of the drive ring 8 and the diaphragm ring 9 with respect to the paper surface, and has a pinion 19a. Reference numeral 20 denotes a two-stage gear that is axially supported by a holding plate like the pulse motor 19, and has a large diameter portion 20a meshed with a pinion 19a and a small diameter portion 20b meshed with a tooth portion 8d of the drive ring 8. There is.

Next, the operation will be described. As shown in FIG. 1, the drive pin 7b of the closing motor 7 in FIG. 3 is located at the position where the closing shutter blades 4 and 5 are already in the open state (that is, the broken line position in FIG. 2A). Shows. When bulb photography is performed in this state, the drive ring 8 is slightly rotated right by the rotation of the pulse motor 19. By this right rotation, the protrusion 8a pushes the pin 12a and pushes the valve regulating member 12 to the right. The locking member 16 slightly turns counterclockwise because the locking portion 16a is pushed by the hook portion 12c, but returns when the locking portion 16a gets over the hook portion 12c. In this state, the closing motor 7 is not allowed to rotate in the closing direction because the movement of the drive pin 7b is blocked by the blocking portion 12b. Therefore, it is not necessary to energize the closing motor 7 to urge it in the opening direction.

After that, the pulse motor 19 rotates in the reverse direction, and the drive ring 8 returns to the initial position shown in FIG. 3, but the valve blocking member 12 is locked by the locking member 16, and the rotation of the closing motor 7 is blocked. It remains as it was. The drive ring 8 continues to rotate counterclockwise and pushes the arm portion 9b with the eccentric pin 8c to rotate the diaphragm ring 9 counterclockwise against the spring 11. The cam groove 9a moves the moving point pin 10b of the diaphragm blade 10 by the counterclockwise rotation of the diaphragm ring 9, and moves the diaphragm blade 10 from the position of the broken line in the fully open (F3.5) state to the position of the chain line of the minimum diaphragm (F22). Change. When the predetermined aperture position is reached, the pulse motor 19 stops, and the opening motor 6 is energized to start the exposure of the film as described with reference to FIG.

When the finger is released from the shutter button of the camera after the desired exposure time has elapsed, the pulse motor 19 is energized, the drive ring 8 is further rotated counterclockwise from the aperture aperture setting position, and the projection 8b is turned to the arm 16b. And the locking member 16 is rotated counterclockwise. Therefore, the valve blocking member 12 is released from the locking by the locking portion 16a, and is returned to the position shown in FIG. At this time, the closing motor 7 is energized in the closing direction, and the closing shutter blades 4 and 5 are closed by clockwise rotation to end the exposure. After that, the pulse motor 19 rotates in the reverse direction, the drive ring 8 returns to the initial position in FIG. 3, and the diaphragm ring 9 also returns following the spring 11.

In the case of non-bulb photography, the drive ring 8 is immediately turned counterclockwise from the initial position of FIG. 3, and after the exposure is finished, the drive ring 8 is rotated clockwise from the aperture setting position and returned to the initial position.

The eccentric pin 8 c is for adjusting the relative relationship between the drive ring 8 and the diaphragm ring 9 during assembly, and the spring 11 is stretched between the drive ring 8 and the diaphragm ring 9. Alternatively, the drive ring 8 and the diaphragm ring 9 may be integrated or formed of one component. Further, in the above embodiment, the driving ring has been described as setting the aperture diameter, but it may be one for setting the lens for focus adjustment at a predetermined position in the autofocus mechanism.

[0021]

[Effect of device]

 As described above, according to the present invention, in a camera shutter device in which at least the closing shutter blade is operated in conjunction with the reciprocating rotation of a moving magnet type motor (commonly called an iris motor), an aperture diameter and a focus adjustment lens are provided. A setting mechanism that sets the shooting conditions such as before the start of exposure to prevent the closing operation of the closing shutter blade via the valve control member during bulb shooting, and releases the blocking at the end of exposure. Therefore, the structure is extremely excellent, and since the energization of the closing motor can be stopped in the blocking state, the power saving effect of the power source is extremely large.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a shutter mechanism to which the present invention is applied.

FIG. 2 is an enlarged explanatory view of the motor rotor in FIG. 1, in which (a) shows a rotor of a closing motor and (b) shows a rotor of an opening motor.

FIG. 3 is a plan view showing an embodiment of a valve mechanism according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Shutter base plate 1a Photographing opening 1b, 1c Slots 1d, 1e, 1f, 1g, 13, 14, 17, 18
Shafts 2, 3 Opening shutter blades 4, 5 Closing shutter blades 6 Opening motors 6a, 7a Rotors 6b, 7b, 12a Pins 6c, 7c Complement poles 7 Closing motors 8 Drive rings 8a, 8b Projections 8c Eccentric pins 8d tooth part 9 diaphragm ring 9a cam groove 9b, 16b arm part 10 diaphragm blade 10a fulcrum pin 10b moving point pin 11,15 spring 12 valve regulating member 12b blocking part 12c key part 16 locking member 16a locking part 19 pulse motor 19a Pinion 20 gear

Claims (5)

[Scope of utility model registration request] 1. A shutter blade for opening, a shutter blade for closing, a closing motor for reciprocating in conjunction with the closing shutter blade, and a pulse motor for each photographing to move from an initial position to a predetermined photographing condition setting position. And a shutter for closing against the habit of self by the setting mechanism when the setting mechanism is moved from the initial position in the direction opposite to the photographing condition setting direction by the pulse motor during bulb photographing. A valve restricting member that is moved to a position that blocks the operation of the blade, and a locking member that locks the valve restricting member at the position that blocks the closing operation, and the setting mechanism sets the setting in the shooting condition setting direction. The shutter device for a camera, wherein the locking of the valve regulating member by the locking member is released when the shutter device is moved beyond the range. Valve mechanism in storage. 2. The setting mechanism is reciprocally operated by the pulse motor to drive the valve restricting member to a position that prevents the closing operation of the closing shutter blade from the initial position when the valve photographing is performed. 2. The photographing condition setting member which is pushed in the photographing condition setting direction by the driving member and is returned to the initial position by the driving member according to its own habit. A valve mechanism in the shutter device for a camera described. 3. A valve mechanism in a camera shutter device according to claim 2, wherein the photographing condition setting member is a diaphragm aperture setting member. 4. The valve mechanism in a camera shutter device according to claim 2, wherein the photographing condition setting member is a setting member of a focus adjustment lens. 5. The valve restricting member engages with a shutter blade driving pin provided integrally with the rotor of the closing motor to prevent the closing shutter blade from operating in the closing direction. The valve mechanism in the camera shutter device according to any one of claims 1 to 4, wherein: