JPH0733219Y2 - Camera with built-in ultrasonic motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a camera with a built-in ultrasonic motor.

[Conventional technology]

A camera having a built-in ultrasonic motor as a drive source for winding and rewinding a film is known (for example, Japanese Patent Laid-Open Publication No. Sho-sho).
63-77039). Further, there is known a camera in which a rotational force of a motor is selectively transmitted to a hoisting gear system and a rewinding gear system by using a planetary gear clutch mechanism (for example, Japanese Utility Model Laid-Open No. 59-131722). . Also known is a camera that has a built-in lens drive motor in addition to the winding motor, and rotates the lens drive motor in response to a signal from the distance measuring device (AF device) to adjust the focus of the taking lens. Has been.

[Problems to be solved by the device]

A motor used for film feeding is required to have a low rotation speed and a large torque. For this reason, the conventional motor has the drawbacks that the reduction gear mechanism is built in the motor housing, which causes a loud noise during rotation and lengthens the motor in the axial direction. Further, since the film feeding motor is usually housed in the take-up spool, a large number of gears are required to transmit the rotational force of the motor to the winding shaft of the cartridge. As a means for solving these problems, it has been considered to use a high-torque, thin ultrasonic motor as described above, but still two ultrasonic motors are used for winding and rewinding the film. The location of the ultrasonic motor did not make use of the thinness of the ultrasonic motor.

Further, the conventional camera using the dedicated motors for the film feeding and the auto focus is disadvantageous in terms of space and cost.

An object of the present invention is to provide a camera in which an ultrasonic motor is arranged at a position where its shape can be utilized, and which has low noise and a simple power transmission system.

An object of the present invention is to provide a camera capable of feeding a film and adjusting the focus of a lens with one ultrasonic motor.

[Means for Solving the Problems]

In order to achieve the above object, an ultrasonic motor built-in camera of the present invention comprises an ultrasonic motor, a drive gear driven by the ultrasonic motor, and a bottom portion of a camera body between a take-up spool and a patrone winding shaft. And a planetary gear for winding and a planetary gear for rewinding, which mesh with the drive gear, a lever for holding these planetary gears at appropriate intervals, and a winding motor when the ultrasonic motor rotates in the first direction. The planetary gears mesh with each other, and when the ultrasonic motor rotates in the second direction, the planetary gears mesh with the winding gears for transmitting the rotation force of the gears to the take-up spool to wind up the film. The rewinding gear for transmitting the rotation force of the gear to the winding shaft of the cartridge to rewind the film into the cartridge.

In addition, a double planetary gear clutch mechanism is used in order to perform film feeding and focus adjustment with one ultrasonic motor. This double planetary gear clutch mechanism
A sun gear driven by an ultrasonic motor, a ring gear arranged so as to surround the sun gear, a lens drive planetary gear group arranged between the ring gear and the sun gear, and a hoisting planet meshing with the outer teeth of the ring gear. It is composed of a gear and a planetary gear for rewinding. The lens driving planetary gear group is held by the lens driving lever, and the hoisting planetary gear and the rewinding planetary gear are held by the lever.
To prevent the ring gear from rotating when adjusting focus,
A first lock lever is provided. Also, in order to prevent the lens drive planetary gear group from revolving during rewinding,
A second lock lever is provided.

[Action]

When the ultrasonic motor provided at the bottom of the camera body between the take-up spool and the winding shaft of the cartridge rotates in the first direction, the hoisting planetary gear and the rewinding planetary gear revolve, and thus the hoisting planetary gear. Meshes with the hoisting gear. After this meshing, the revolution of the hoisting planetary gear is stopped and the rotation of the planetary gear is started instead. Therefore, this rotational force is transmitted to the hoisting gear and the film is wound on the take-up spool. When the ultrasonic motor rotates in the second direction, the hoisting planetary gear and the rewinding planetary gear revolve, and the rewinding planetary gear meshes with the rewinding gear. After this meshing, the revolution of the rewinding planetary gear stops and rotation starts instead.Therefore, this rotational force is transmitted to the rewinding gear, and the film wound on the take-up spool is placed in the cartridge. Rewind.

In the invention using the double planetary gear clutch mechanism, the lens driving planetary gear revolves because the first lock lever locks the ring gear during focus adjustment. By the revolution of the planetary gear for driving the lens, the lens driving lever is displaced, and the photographing lens is moved to adjust the focus. When winding,
Since the lens driving planetary gear group revolves in the opposite direction, the lens driving lever returns to the initial position. Since this lens drive lever is held at the initial position, the ring gear rotates instead to revolve the hoisting planetary gear and mesh it with the hoisting gear. This planetary gear for winding winds the winding gear after meshing with the winding gear, and winds the film in the cartridge to the winding spool. Also,
At the time of rewinding, the second lock lever blocks the revolution of the planetary gear group for driving the lens, so that the ring gear rotates. The ring gear revolves the rewinding planetary gear to mesh with the rewinding gear, and after the meshing, the rewinding gear is rotated to rewind the film wound on the take-up spool into the cartridge.

〔Example〕

In FIG. 2, as is well known, on the left side of the camera body 10, there is formed a winding chamber that houses the winding spool 11.
On the right side, a cartridge storage room for storing the cartridge 12 is formed. At the center bottom of the camera body 10, a large-diameter disk-shaped ultrasonic motor 13 is arranged. Also,
A lens barrel 15 holding a taking lens 14 is movably attached to the center of the camera body 10, and distance measuring windows 16 and 17 and a finder window 18 are provided above the lens barrel 15.
Reference numeral 19 is a release button.

FIG. 1 shows a film feeding mechanism and a focus adjusting mechanism using a double planetary gear clutch mechanism. The ultrasonic motor 13 is composed of a disk-shaped vibrating body 13a and a moving body 13b. The vibrating body 13a is divided into a number of areas, and a piezoelectric material having electrodes attached to each area, for example, a piezoelectric ceramic, is attached to a supporting disk. When a voltage having a predetermined cycle is applied to each area, they generate flexural vibrations, and thus waviness occurs in the vibrating body 13a. This swell is transmitted to the moving body 13b by friction, so that the moving body 13b rotates. The shaft 22 is fixed to the moving body 13b, and the sun gear 23 is fixed to the shaft 22. The sun gear 23 may be fixed to the upper surface of the moving body 13b, or teeth may be formed on the outer peripheral surface of the moving body 13b to be used as the sun gear.

A ring gear 25 having inner teeth 25a and outer teeth 25b is arranged so as to surround the sun gear 23. Three lens driving planetary gears 26 are arranged so as to mesh with the inner teeth 25 of the ring gear 25 and the sun gear 23. These lens driving planetary gears 26 have four arm portions formed,
Further, it is rotatably supported by a lens drive lever 27 that is loosely fitted to the shaft 22 of the ultrasonic motor 13. In this lens drive lever 27, the tip of the arm portion 27a has the protrusion 15a of the lens barrel 15.
Is pushed against the spring 29. Further, another arm portion 27b pushes one end of the lens lock lever 30,
The ratchet 31 provided on the lens barrel 15 releases the engagement with the claw provided at the tip of the arm. Also, this arm part 27b
A taper 32 is formed at the tip of the lock lever 33. When the lens drive lever 27 rotates clockwise, one end of the lock lever 33 is pushed to release the engagement with the recess 25c provided in the ring gear 25. Two recesses 25c are provided at positions separated by 180 degrees. Lock lever 33 and lens lock lever 30
It is rotatably attached to 34, and a spring 35 is hung between them.

The outer teeth 25b of the ring gear 25 have a planetary gear 38 for winding.
And the planet gear 39 for rewinding are meshed with each other. These planetary gears 38, 39 are rotatably attached to a V-shaped lever 40 loosely fitted to the shaft 22 of the ultrasonic motor 13. When the ring gear 25 rotates counterclockwise, the planet gears 38 and 39 revolve counterclockwise and the hoisting planet gear 38 turns.
The rotation force of the ring gear 25 is transmitted to the hoisting gear 42 by meshing with the gear 42. On the other hand, when the ring gear 25 rotates clockwise, the planet gears 38 and 39 revolve clockwise, the rewind planet gear 39 meshes with the rewind gear 43, and the rotational force of the ring gear 25 revolves. Transmitted to 43.

The winding gear 42 is connected to a lower portion of the winding spool 11. Further, the rotation of the rewinding gear 43 is transmitted to the gear 46 via the shaft 45. The rotation of this gear 46 is
It is transmitted to the rewinding claw 49 via 7,48. This rewind claw 49
Is engaged with the winding shaft 12a of the cartridge 12. The rewinding gear 43 and the rewinding claw 49 may be provided on the bottom side of the camera. The rewinding lever 52 is slid against the spring 53 at the time of rewinding, and the tip of the rewinding lever 52 has a claw at the pin 28 of the lens drive lever 27.
To prevent the lens drive lever 27 from rotating.

FIG. 3 shows a motor control device. Shooting lens
The position of 14 is detected by a position sensor 60 which is interlocked with the lens barrel 15. The lens position signal output from the position sensor 60 and the AF signal output from the well-known AF circuit 61 are sent to the match detection circuit 62 for comparison. When the taking lens 14 is in focus, the AF signal and the lens position signal match, and in this case, the match detection circuit 62 outputs a match signal to the motor control circuit 62.
Further, the motor control circuit 62 is connected with a rewind switch 64, a release switch 65, a constant feed detection circuit 66, and a rewind completion detection circuit 67. The rewind switch 64 is turned on in conjunction with the rewind lever 52 to generate a rewind signal. The release switch 65 is turned on when the release button 19 is pressed.
Then, a release signal is generated. The fixed amount feed detection circuit 66 is
As is well known, for example, by counting the number of perforations, the quantitative feeding of the photographic film is detected. Further, the rewinding completion detecting circuit is composed of, for example, a switch arranged on the passage of the photographic film. The motor control circuit 63 controls the rotation direction and rotation amount of the ultrasonic motor 13 via the driver 68.

Next, the operation of the above embodiment will be described with reference to FIGS. When the release button 19 is pressed during shooting, the relays switch 64 is turned on and the release signal is input to the motor control circuit 63. This motor control circuit 63 is
As shown in FIG. 7, the ultrasonic motor 13 is rotated in the reverse direction to rotate the sun gear 23 counterclockwise. At the start of rotation of the sun gear 23, the hoisting planetary gear 38 is in mesh with the hoisting gear 42, as shown in FIG.

As for the lens drive planetary gear 26 and the ring gear 25, the lens drive planetary gear 26 has a smaller load.
When 23 rotates counterclockwise, the lens drive planetary gear 26
Revolves counterclockwise. As a result, the lens drive lever 27 rotates counterclockwise, so that the arm portion 27b is disengaged from the lock lever 33 (see FIG. 5). When the lens drive lever 27 further rotates counterclockwise, its arm 27a
Will hit the projection 15a of the lens barrel 15.

When the lens drive lever 27 hits the projection 15a of the lens barrel 15, the load on the lens drive planetary gear 26 increases,
Rotation starts at that position, and the ring gear 25 rotates in the clockwise direction instead. As a result, the hoisting planetary gear 38 and the rewinding planetary gear 39 revolve clockwise, so that the meshing with the hoisting gear 42 is released. Then, until just before the rewinding planetary gear 39 meshes with the rewinding gear 43, the ring gear
When 25 rotates, the tip of lock lever 33
Enter the notch 25c (see Fig. 4). This allows
Since the ring gear 25 is locked by the lock lever 33, the lens driving planetary gear 26 revolves around the sun again and the lens driving lever 27
Press the lens barrel 15 with.

As shown in FIG. 4, the lens barrel 15 is a lens drive lever.
When 27 is pushed, the ratchet 31 moves against the spring 29 while sliding the pawl of the lens lock lever 30. While the lens barrel 15 is moving, the position sensor 60 outputs a lens position signal. And this lens position signal and AF
When the signals match, the motor control circuit 63 stops the rotation of the ultrasonic motor 13. While the ultrasonic motor 13 is stopped, the claw of the lens lock lever 30 is engaged with any one tooth of the ratchet 31.

When the taking lens 14 is set at a position corresponding to the subject distance, a shutter (not shown) is actuated to start the exposure of the photographic film F. Then, when the shutter is closed, the motor control circuit 63 rotates the ultrasonic motor 13 in the clockwise direction. When the sun gear 23 rotates clockwise, the lens drive planetary gear 23 and the lens drive lever 27 start to revolve clockwise. When the lens drive lever 27 rotates clockwise, the arm portion 27b pushes one end of the lens lock lever 30, which rotates counterclockwise, so that the claw at the tip end comes off the ratchet (see FIG. 6). As a result, the lens barrel 15 retracts toward the initial position by the stored force of the spring 29. When the lens drive lever 27 further rotates clockwise, the taper 32 pushes the lock lever, and the tip is pulled out from the notch 25c.

The lens drive lever 27 hits the pin 54 and is prevented from rotating after releasing the lock of the lock lever 33, so that the ring gear 25 rotates counterclockwise instead. The rotation of the ring gear 25 causes the hoisting planetary gear 38 and the rewinding planetary gear 39 to rotate counterclockwise, so that the hoisting planetary gear 38 meshes with the hoisting gear 42. After this engagement, the fifth
As shown in the figure, since the hoisting planetary gear 38 rotates,
The rotational force is transmitted to the hoisting gear 42. When this hoisting gear 42 rotates, the take-up spool connected to it
Photo film F stored in Patrone 12 after rotating 11
Pull out and wind it around its circumference.

During the winding of the photographic film F, the constant amount feeding detection circuit 66 measures the transfer amount of the photographic film F, and
When a fixed amount is transferred, a fixed amount feed end signal is sent to the motor control circuit 63. This motor control circuit 63 is an ultrasonic motor.
Since the rotation of 13 is stopped, the winding of the photo film F is completed. At the end of the winding, the winding planetary gear 38 is still in mesh with the winding gear 42, so that the photo film F is prevented from returning mainly due to the friction load force of the ultrasonic motor 13. Similarly, release button 19
Each time you operate, the ultrasonic motor 13
And the winding of the photo film F after the shutter is operated.

When all frames have been shot, the rewind lever 52
If is slid, it is held in the sliding position until the pin 28 (described later) and the claw of the rewinding lever 52 are locked by the action of the lever 55 (see FIG. 6). When the rewinding lever 52 slides, the rewinding switch 65 is turned on, and the motor control circuit 63 rotates the ultrasonic motor 13 counterclockwise. When the ultrasonic motor 13 rotates, the lens-driving planetary gear 26 with a small load revolves counterclockwise. When it revolves slightly, the pin 28 engages with the claw of the rewind lever 52, so that the lens drive planetary gear 26 is prevented from revolving, and instead the ring gear 25 rotates clockwise. This ring gear
When 25 rotates, the hoisting planetary gear 38 and the rewinding planetary gear 39 revolve clockwise, and the rewinding planetary gear 39 meshes with the rewinding gear 39. After this meshing, as shown in FIG. 6, the rotational force of the rewinding planetary gear 39 is transmitted to the rewinding gear 43. This allows the rewinding claws via the gears 46-48.
Since 49 rotates, the winding shaft 12a in the cartridge 12 rotates clockwise, and the photographic film F wound on the take-up spool 11 is rewound in the cartridge 12.

When the rewinding of the photo film F is completed, a signal is generated from the rewinding completion detection circuit 67 and is input to the motor control circuit 63, so that the rotation of the ultrasonic motor 13 is stopped. After the rewinding is completed, the ultrasonic motor 13 is reversely rotated by a predetermined amount by opening the back cover or taking out the film to rewind the lever 52 and the pin 28.
Unlock and return to the state shown in FIG.

[Effect of device]

As described in detail above, the present invention uses an ultrasonic motor that does not require a reduction gear mechanism. Therefore, the rotation noise of the motor can be reduced, and at the same time, the rotation between the take-up spool and the winding shaft of the cartridge can be reduced. Since it is arranged at the bottom of the camera body, it is possible to use a large-diameter ultrasonic motor having a large torque, and it becomes easy to transmit the rotational force to the winding spool and the winding shaft of the cartridge.

Further, since the double planetary gear clutch mechanism is used, focus adjustment, film winding and film rewinding can be performed by one ultrasonic motor.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention. FIG. 2 is a front view of the camera body. FIG. 3 is a block diagram showing an example of the motor control device. FIG. 4 is a plan view of the double planetary gear clutch mechanism showing the extended state of the taking lens. FIG. 5 is a view similar to FIG. 4 showing the winding state. FIG. 6 is a view similar to FIG. 4 showing a rewinding state. FIG. 7 is a timing chart of film feeding. 11 …… Winding spool 12 …… Patrone 13 …… Ultrasonic motor 14 …… Shooting lens 15 …… Lens barrel 23 …… Sun gear 25 …… Ring gear 26 …… Lens driving planetary gear 27 …… Lens driving lever 30 ...... Lens lock lever 33 …… Lock lever 38 …… Winding planetary gear 39 …… Rewinding planetary gear 42 …… Winding gear 43 …… Rewinding gear 52 …… Rewinding lever

Claims (2)

[Scope of utility model registration request] 1. A camera having a built-in ultrasonic motor as a drive source of a take-up spool for winding a film and a winding shaft of a patrone for rewinding the film, wherein the ultrasonic motor is driven by the ultrasonic motor. A planetary gear for winding and a planetary gear for rewinding, which is arranged at the bottom of the camera body between the take-up spool and the winding shaft and meshes with the drive gear, and these planetary gears at appropriate intervals. , And the hoisting planetary gear meshes when the ultrasonic motor rotates in the first direction,
The winding force for transmitting the rotation force of the gear to the take-up spool to wind up the film meshes with the rewinding planetary gear when the ultrasonic motor rotates in the second direction,
A camera with a built-in ultrasonic motor, comprising: a rewinding gear for transmitting the rotation force of the gear to the winding shaft to rewind the film into the cartridge. 2. An ultrasonic motor arranged at the bottom of a camera body, a sun gear driven by the ultrasonic motor, a ring gear arranged so as to surround the sun gear, and between the ring gear and the sun gear. And a lens drive planetary gear group that is arranged in a mesh with the inner teeth of the ring gear and the sun gear,
A lens drive lever that holds these lens driving planetary gear groups and that rotates concentrically with the sun gear to extend the shooting lens in the optical axis direction, and a hoisting planetary gear and a rewinding planetary gear that mesh with the outer teeth of the ring gear. A gear, a lever that holds these planetary gears, and a lens drive planetary gear that revolves when the shutter is released to prevent the ring gear from rotating.
Lock lever, the second lock lever that prevents the lens drive planetary gear from revolving during rewinding, meshes when the hoisting planetary gear revolves, and the rotation force of this planetary gear is transmitted to the take-up spool. Then, the winding gear for winding the film and the rewind planetary gear mesh when they revolve in the second direction, and the rotation force of this planetary gear is transmitted to the winding shaft of the cartridge to transfer the film to the inside of the cartridge. A camera with a built-in ultrasonic motor, comprising a rewinding gear for rewinding the ultrasonic motor and a motor control device for controlling the rotation of the ultrasonic motor.