JPH03208033A - Power dividing unit for camera - Google Patents

Abstract

PURPOSE:To obtain this power deviding unit for a camera by providing a locking mechanism, and locking all other indexing gears than an indexed gear. CONSTITUTION:When an external operating instruction is received, a control circuit is driven to control an indexing motor 12 and a driving motor 1, based on an arithmetic/comparing function. Consequently, the motor 12 rotates, and a gear train 13, a cam gear 14c, an index cam plate 14, and a pulse plate 23 are turned. Projections 15c, d of followers 15a, b follow up, the followers move along a shaft 17, a gear 10a and an indexing gear 11a are engaged and the motor 12 stops. Subsequently, the projecting part of a stopper spring engaged with the gear 11a is pushed up by the projection 15t of the follower, and the gear 11a rotates, but other gear is locked by the projecting part of the spring 50, and each mechanism for driving an optical system cannot be driven. The control circuit reads information by an armature 24 from the pulse plate 23. After the motor 12 stops, the motor 1 rotates and drives a shaft 9 through gear trains 3, 8 and a zoom cylinder 25 is transferred out by the gear 11a. Since indexing is executed by the stop of the driving gear 10a, other indexing gears 11b, d do not turn, and a camera generates no malfunction.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a drive gear driven by a drive motor, and a plurality of indexers each connected to a plurality of mechanisms such as a zoom lens barrel and a shutter drive. The present invention relates to a power split unit for a camera, which comprises a drive gear and a drive gear that selectively meshes with one of the index gears to transmit power.

[Prior Art] As is well known, in an electric camera, the film winding and rewinding, a zoom lens barrel, a shutter, a lens, an optical system for close-up photography, etc. are appropriately driven by a motor.

Conventionally, sequential means have been adopted to drive these mechanisms, such as by providing a plurality of motors, or by using a differential mechanism that matches the sequence of a particular camera.

[Problems to be solved by the invention] However, when the number of motors increases, it is not only disadvantageous for downsizing the camera, but also makes mounting for wiring complicated, increasing the cost of parts including the motor, and assembly cost. It also has the disadvantage of being expensive.

Furthermore, if a sequential mechanism is adopted, a complicated mechanism such as a differential mechanism must be used, making it difficult to guarantee operational stability. Furthermore, since it becomes difficult to perform operations other than the original sequence, it becomes difficult to develop the camera system and add functions. For the same reason, it is difficult to set a standard mechanism and use it as a common component for many products, and it is necessary to design a new mechanism for each product, which increases development man-hours and reduces mass production efficiency. The disadvantage is that it cannot be expected.

Therefore, an object of the present invention is to provide a power splitting unit for a camera as a power transmission mechanism that is compact, inexpensive, versatile, and expandable.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a drive gear driven by a drive motor, and a plurality of gears each connected to a plurality of mechanisms such as a zoom lens barrel and a shutter drive. The drive gear selectively meshes with one of the index gears to transmit the power of the drive motor to the index gear, and this mechanism includes a locking mechanism and All index gears other than the locked gear are configured to be locked.

According to another invention, the indexing gear also includes a gear connected to a gear on a film winding spool.

[Function] Since the present invention has the above configuration, for example, when a signal is output from an operating member external to the camera, the drive gear moves to mesh with the selected index gear. When it reaches the position where it engages and engages with the index gear, it is driven. Therefore, only the desired mechanism, for example, only the zoom lens barrel, is driven. At this time, since the indexing gears other than the indexed gear are locked by the locking means, other indexing gears are driven and, for example, the shutter, lens, etc. are not inadvertently driven and the camera does not malfunction. .

In addition, as in other inventions, a single drive motor can drive not only the zoom lens barrel, shutter drive, lens drive, and optical system for close-up photography, but also the film winding gear, etc., making the camera more compact. Not only is this advantageous, but it also simplifies mounting for wiring, lowers the cost of parts including the motor, and lowers assembly costs. Furthermore, it becomes easy to develop the camera system and add functions. For the same reason, it is possible to set a standard mechanism and use it as a common component for many products, making it possible to create a common design for each product, reducing development man-hours, and
It is also advantageous for mass production effects.

[Example] Hereinafter, a first example of the present invention will be described with reference to FIGS. 1 to 7.

Now, referring to FIG. 1, this embodiment consists of a drive gear section A including a drive motor 1, an indexing section B for selecting an indexing gear, and an indexing motor section C for driving this indexing section B. It is easy to understand that it is roughly constructed from the following.

In addition, an example of indexing by the indexing part B is the zoom lens barrel 2.
5 and that it is also provided with a spool 7 for winding the film.

The drive part A includes a drive motor 1 .

The power of this drive motor 1 is transmitted to a gear train 8 for transmitting driving force.
The driving force transmission shaft 9 is constantly driven through the. That is, as shown in FIGS. 1 and 2, a gear 3b is fixed to the output shaft of the drive motor 1.
c are engaged, and the worm 3d is rotationally driven. The worm reduces the speed and changes the direction of the drive shaft by 90 degrees, causing the gear trains 8a, 8b, 8c, 8
The driving force transmission shaft 9 is driven via d.

The drive force transmission shaft 9 is a shaft that rotationally drives a drive gear that drives a zoom lens barrel, etc., which will be described later, and the drive motor 1 also drives a gear train for winding and rewinding the film. That is, as clearly shown in FIG. 1, FIG. 2, and especially FIG. 5, the output shaft 3 of the drive motor 1 is provided with two stages of planetary gears 2, 2 as a reduction gear train. . These planetary gears 2, 2 mesh with an internal gear 27, and a transmission gear 3 is integrally formed on the carrier 2°. The transmission gear 3 meshes with three planetary gears 21, and these gears mesh with the inner gear of the locking pawl plate 20. Therefore,
When the locking pawl plate is not restrained, the planetary gear 21 acts as a mere idler that rotates the locking pawl plate, but
When the locking claw plate 20 is fixed, it rotates and revolves,
The sangya 22 is rotated by a shaft 22a that rotatably supports the planetary gear 21. A single planetary arm 4 is rotatably attached to the carrier 2'', and a gear 5 having rotational friction is provided at the tip thereof, and this gear meshes with the sun gear 22. 5 selectively meshes with an idler 6 for film winding and a return gear 5+1 2 6. The idler 6 meshes with a gear 7' of a spool 7 for film winding which has a built-in drive motor 1. Note that the rewinding gear train 26 also meshes with the gear 7', but is not shown.

The indexing section B includes a pair of followers 15a and 15b. The follower has a horizontally arranged guide shaft 1
7, and as shown in FIG. 6, has tabs 15c and 15d on its lower surface, and these tabs are drawn together by a coil spring 18 so as to come into pressure contact with the indexing cam plate 14a. . Fusai Roa 15a
, 15b is shown in FIG. As shown in Figure 2,
When viewed from above, it has a U-shape, and there is a drive gear 1 inside it.
It is equipped with 0a and 10b. That is, a driving force transmission shaft 9 is rotatably supported on the side wall of the follower, and driving gears 10a and 10b are provided on this shaft. In the illustrated embodiment, the transmission shaft 9 has a rectangular cross section. Therefore,
Drive gear 10a. 10b is rotationally driven integrally with the driving force transmission shaft 9, but is movable in the axial direction or thrust direction. Further, the transmission shaft 9 is provided with a bias spring 16 in the form of a coil spring, and the drive gears 10a, 10b
can be moved in the thrust direction by the restoring force of the spring.

As shown in FIG. 1, the index portion B is provided with a stop spring 50 as a locking means. The spring is fixed at its base to, for example, a base plate, and its tip is divided into four protrusions 50a, each protruding downward.
It has b, c, and d. These convex portions are arranged so as to engage with respective teeth of the index gears 11a, b, c, and d. Further, arc-shaped protrusions 15t, t are provided on the lower pivots 15a, b, and these protrusions push up the protrusions 50a to 50d of the spring 50 during indexing, and push the protrusions 50a to 50d of the spring 50 upward during indexing. to release.

The cam portion 14 includes an index cam plate 14a and a second cam plate 1.
It is separated from 4b. As shown in FIG. 2, the indexing cam plate 14a has a substantially snowman-like shape when viewed from above, and the dowels 15c and 15d of the followers 15a and 15b are in pressure contact with each other. On the other hand, the second cam plate has a shape in which two fan-shaped parts are combined, and a follower 19c formed on one side of the locking pawl 19 comes into contact with the second cam plate. It is adapted to engage with the recess 20a.

A pulse plate 23 is provided coaxially with the cam portion 14, and a detection contact piece 24 is arranged corresponding to this pulse plate.

As shown in FIGS. 1 and 6, the indexing motor section C is composed of an indexing motor 12 and a reduction gear train 13, and the rotation of the indexing motor is transmitted through the gear train 13 to a cam gear. 14c, and the cam portion 14 is appropriately driven.

A control circuit for controlling the indexing motor 12, drive rotor 1, etc. includes a CPtl 51 consisting of a microcomputer, as shown in FIG.

The CPtl is connected to a plurality of signals such as signals for driving the zoom lens barrel, signals for releasing the shutter, etc. through the manual switches 56 and 5.
Starting from 7.58, it will be done manually. The control circuit also includes an indexing state encoder 52, and an encoded signal from this encoder is also input to the CPU 51. The CPU 51 has an arithmetic function, a comparison function, etc., and performs arithmetic processing on the above-mentioned input signals and outputs the index motor drive circuit 54,
A control signal is output to the drive motor drive circuit 53.

Next, the operation of the above embodiment will be explained with reference to FIGS. 12 and 15.

It is assumed that the switch 56 for moving the zoom lens barrel 25 toward the telephoto side is turned on (step Sl) by an operating member external to the camera, and an instruction is given to extend the zoom lens barrel. Then, as shown in Figure 15, the microcontroller's CPtl
The signal is manually input to CPtl 51, which outputs it to the indexing motor drive circuit 54, and the indexing motor 2 rotates (step S2).

The rotation of the indexing motor 12 is transmitted to the cam gear 14c via the reduction gear train 13, and the indexing cam plate 14a, second cam plate 14b, and pulse plate 23 are appropriately driven. Since the tabs 15c and d of the followers 15a and b follow the cam plate 14, when the followers move along the guide shaft 17 and the driving gear 10a reaches the engagement position of the indexing gear (step S3), The delivery motor is stopped (step S4). At this time, the protrusion 50a of the stop spring 50 that was engaged with the index galla is replaced by the protrusion 15t of the follower.
As a result, the index galla is released and becomes rotatable.

However, the other indexing gears are locked by the convex portion of the stop spring 50, and each mechanism such as shutter drive, lens drive, and drive of the optical system to the close-up state is reliably prevented from being inadvertently driven.

The determination of indexing is made as follows.

That is, information from the pulse plate 23 is read by the detection contact piece 24, encoded by the encoder 52, and input to the CPLI 51. The CPU compares the code with the code used when selecting the zoom lens barrel, and if they match, outputs a stop signal for the indexing motor 12.

Following the stoppage of the indexing motor 12, the drive motor 1 rotates and the gears 3b. The transmission shaft 9 is driven via the gear train 8a, b, c, and d. As a result, the driving gear 10a drives the indexing gear 11a, and the zoom lens barrel 25 is extended.

At the time of indexing, the phase of the drive gal loa and the index gal
If the phases of a and a match, these gears will mesh, so there is no problem. If they do not match, they will not mesh during indexing. However, the driving gear 10a stops at the side of the indexing gear during indexing and is loaded with a spring 16 in the thrust direction, so as soon as the driving gear 10a starts rotating, the phases match and the driving gear moves in the direction of the indexing gear. , and the two immediately engage. Therefore, according to this embodiment, indexing can be performed by stopping the driving gear 10a, so that other indexing gears llb, connected to, for example, a shutter mechanism, etc.
There is no need to inadvertently rotate c and d. That is, malfunction of the camera is prevented.

When the control circuit of the camera instructs the lens drive gear and the subsequent shutter drive gear by operating a release button (not shown), the index gear llc is first selected and the lens is driven through the same process as described above. Next, index gear llb is selected, and the forward and reverse rotational motion required for the shutter opening/closing operation is similarly transmitted to the shutter mechanism.

Incidentally, when the drive gear is rotationally driven, as shown in FIG. Since the locking portion 19b is rotated clockwise by the fan-shaped portion of the cam plate 14b, the locking portion 19b is separated from the concave groove 20a of the locking pawl plate 20. That is, the locking claw plate 20 is rotatable. Therefore, the planetary gear 21 meshing with the internal teeth of the locking pawl plate,
21.21 rotates as an idle gear and Sanghya 2
2 does not rotate. The film winding spool 7 is therefore not driven in either direction.

Next, a case where a film winding operation is instructed will be explained. First, the indexing motor 12 rotates, and the cam portion 14 and the pulse plate 23 rotate via the reduction gear train 13. When the control circuit of the camera body detects from the information from the pulse plate 23 that the drive gears 10a, b are not engaged with any of the index gals a, b, c, d, the index motor 12 stops. do. At this time, as shown in FIG.
*2 It is located in the recessed part of the cam plate 14b. Therefore, the locking portion 19b is in a state where it can engage with the recess 20a of the locking pawl plate 20. If engaged accidentally, the locking pawl plate 20 will not rotate, so the idler 21 will operate as a planetary gear and the shaft 22
The sangya 22 is rotated by a. That is, the rotation of the drive motor 1 is transmitted to the sun gear, and the planetary gear 5 that meshes with the sun gear comes to mesh with the idler 6 (FIG. 3). The idler 6 then drives the gear 7' of the film winding spool 7, and the film is wound up. Locking part 19b
When the drive motor 1 rotates, the planetary gear 21 acts as an idler and the locking pawl plate 2o rotates, so that the concave portion 20
a reaches the position of the locking portion 19b, and the two eventually engage. Once engaged, the film is wound as previously described.

When a command is given to rewind the photographed film, the drive motor 1 is reversely rotated in the winding sequence and the film is rewound in the same manner.

That is, when the drive motor 1 rotates in the reverse direction, the idler 6 also rotates in the opposite direction and now meshes with the rewind gear train 26. This condition is shown in FIG.

Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment as well, a stopper spring 50 is provided as a locking means, but it is not shown. In the above-described 'tfJ1 embodiment, a dedicated indexing motor was used to drive the indexing cam section, but in this embodiment, the cam section is also driven by the drive motor. That is, as shown in FIG. 7, when indexing, the idler 34
The cam gear 14c (shown in Figure i6) is driven via the
When the indexing is completed, the drive gear 1 is activated via the worm gear 3d.
0a and 10b are configured to be driven.

To explain in more detail, the indexing drive section includes plunger 2.
8, a connecting lever 31 driven by this plunger,
A switching lever 33 is connected to this lever via a pin 32a and an elongated hole, and a switching gear 33 is provided at the tip of the lever and meshes with the gear 3b, and selectively meshes with the idler 34 and the worm gear 3d. It is roughly structured.

A yoke 29 is provided on the plunger 28, and this yoke is biased by a spring 30 in a direction away from the yoke. A vertically bent portion 31a of the connecting lever 31 is inserted into a gap 29a at the tip of the yoke 29. Therefore, when the plunger 28 attracts or releases the yoke 29, the connecting lever 31 swings about the fulcrum 3lb, and the switching lever 32 also swings about the fulcrum 32b. Since the fulcrum 32b is located on the axis of the drive motor 1, the switching gear 33 is connected to the switching lever 32.
It always meshes with the gear 3b regardless of its position. Therefore,
Due to the operation of the plunger 28, the power of the drive motor 1 is transmitted to the idler 34 meshing with the cam gear 14c via the gear 3b and the switching gear 33, and also to the drive gear 10a.
, 10b can also be transmitted to the worm gear 3d.

Similarly to the control circuit of the first embodiment, the control circuit of the second embodiment also includes a CPU 5 1 , an indexing state encoder 52, a drive motor drive circuit 53, etc., and further includes a plunger drive circuit instead of the index motor drive circuit. A circuit 70 is provided.

Next, the operation of the above embodiment will be explained. This embodiment is the same as the first embodiment except that the indexing gear is indexed by a plunger, so only the indexing operation part will be explained, and the functions of other parts will be explained in the first embodiment.
3 and 16, FIG. 12 shows the operation of the first embodiment. The same reference numerals as those in FIG. 15 are used to avoid redundant explanation.

It is assumed that a switch 56 for moving the zoom lens barrel 25 toward the telephoto side is turned on by an operating member external to the camera, and an instruction is given to feed out the zoom lens. Then that signal will be sent to the CPU
51 and is output to the plunger drive circuit 70, causing the plunger 28 to pull the yoke 29 to the right in FIG. Therefore, the connecting lever 31 is the fulcrum 3l.
The switching lever 32 also pivots around the fulcrum 32.
It swings around b to the position shown by the chain line. Then, the switching gear 33 is connected to the cam gear 1 via the idler 34.
4C (shown in Figure 6). And CPU 5
1 to the drive motor drive circuit 53, the drive motor 1 rotates, and the power is transmitted to the gear 3b and the switching gear 3.
3 to the cam gear 14c, and index gear 11a is indexed in the same manner as described with respect to the first embodiment.

When the indexing is completed, the output from the plunger drive circuit 70 disappears, and the yoke 29 of the plunger 28 returns to the position shown by the solid line in FIG. Then Gya 3
b is the drive gear 10a, 10 via the switching gear 33.
It comes to mesh with the worm gear 3d for driving b. Then, when the signal is output from the CPU S i to the drive motor drive circuit 53, the drive motor 1 rotates, and the zoom lens barrel is driven by a predetermined amount toward the telephoto side.

According to this embodiment, since indexing can be performed using a single drive motor, the camera can be made more compact and provided at a lower cost.

Next, a third embodiment of the present invention will be described with reference to FIGS. 8 to 11. According to this embodiment, one drive motor drives not only the zoom lens barrel but also the film winding gear. For this purpose, five index gears 117 to 121 are provided concentrically as shown in FIG.
24, 125, 126, and 127 are designed to mesh with each other.

The output gear 123 meshes with the gear 122a of the film winding spool 122, as shown in FIG.
5, the zoom lens barrel 132 is connected via gears 133 and 137, the output gear 126 is the lens drive mechanism, and the output gear 127 is the drive mechanism for the optical system to the close-up state. They are designed to drive each.

Gear locking plates 105 to 109 are provided to rotatably support these index gears 117 to 121. The gear locking plate has a substantially trapezoidal shape when viewed from above, as shown in FIG. 9, and a substantially U-shape when viewed from the side, as shown in FIG. 11. The index gears 117 to 121 are supported inside by dowels 131a-e. The gear locking plate is also movable up and down, as shown in FIG.
A concave portion is formed in which a convex portion 117a (the other convex portions are shown in the zxo diagram) formed on the lower surface of 7 to 121 is engaged.

The mechanism for driving the above-mentioned index gear or output gear is constructed as follows. That is, as shown in FIGS. 8 and 11, the output of the drive motor 112 built into the film spool 122 is reduced by a reduction gear train 113 composed of planetary gears, and the carrier 11
One planetary gear 115 meshes with an output gear 114a formed integrally with the output gear 114a, and index gears 117 to 121 are appropriately driven by this gear 115.

As shown in FIG. 11, the planetary gear 115 is
It is rotatably supported by a planetary arm 104, and a friction spring 116 on a support arm 103 rotatably supported by a carrier 114 is in contact with the lower surface of the planetary arm 104.

As shown in FIG. 349, the planetary arm 104 has a planar shape in which the portion located on the index gear side is widened to form a fan-shaped portion 104c. 104c, and there is a notch 10 between this fan part.
4a is formed. Also, the opposite end of the notch is the first
As shown in Figure 1, it is biased by a spring. The intermediate portion thereof is pressed by the convex portion 102b of the transmission arm 102. Therefore, when plunger 101 attracts suction, transmission arm 102 rotates in the direction indicated by arrow A in FIG. 11 against spring 134, and the planetary arm becomes free and is pushed upward by spring 135.

Note that the cover 136 of the reduction gear train 113 and the support arm 10
3, a lock spring 111 is fixedly provided. This spring is bent upward as shown in FIG. 11, and biases each of the gear locking plates 105-109 upward. Further, rotation locking members 130, 130 are installed on the base plate at a predetermined interval.

The indexing pulse generation circuit 80 shown in FIG.
a reflection plate 128 that rotates integrally with the support arm 103;
It is composed of a reflective photocoupler 129 that detects reflected light.

Next, the operation of the above embodiment will be explained with reference to FIGS. 14 and 17.

For example, the teleswitch 5 for extending the zoom lens barrel 132
6 is turned on, step S1. 〉. Then, CPtl 5 1 is output to the plunger drive circuit 70, and the plunger 101 attracts the transmission arm 102 (step S). Planet arm 104 becomes free and spring 1
35, it rotates in the direction shown by arrow B in FIGS. 8 and 11.

In this state, the planetary arm 104 is connected to the gear locking plates 105 to 1.
09 and can rotate around the drive gear or carrier 114. At this time, the gear locking plates 105 to 10B are pushed upward by the lock spring 111, and their recesses engage the convex portions 117axe of the index gears 117 to 121, respectively, so that the index gears are locked and cannot rotate.

In other words, camera malfunctions do not occur.

Continuing the above operation, when the CPII 5 1 outputs the driving signal to the drive circuit 53, the drive motor 112 rotates (step S, 2). Then, the drive gear 114a drives the planet gear 115, but at this time, since the friction spring H6 is provided between the support arm 103 and the planet gear 115, the planet gear 115 revolves around the drive gear 114. .

When the support arm rotates, the reflection plate 128 integrated therewith also rotates, and a pulse signal is obtained at the photocoupler 129. If the next pulse is not output even after the predetermined time has elapsed (step S13), the CPU outputs the planetary arm 104.
is in the initial position due to contact with the rotation locking member 130, and the drive motor 112 is reversely rotated via the drive circuit (step S14).

When pulses are emitted three times from this state (step S
+s), the CPU determines that the planetary arm, and thus the gear 115, has passed through the two indexing gears and has selected the indexing gear 119 for the zoom lens barrel, and stops energizing the plunger 101. Then, the transmission arm 102
4, it rotates in the opposite direction to the direction indicated by arrow A in Figure 8.11. At this time, the plunger is turned off before the notch 104a of the planetary arm 104 reaches the dowel 131C, and the dowel 131C is located below the fan section 104C.

This is because the photocoupler emits a pulse before the reflective surface directly faces the photocoupler.

Then, when the planetary arm 104 further rotates, arm 1
The notch 104a of 04 engages with the dowel 131c, and the planetary arm is fixed. Therefore, the planet gear 115 becomes an idler and drives the index gear 119. Note that when the notch 104a of the planetary arm 104 engages with the dowel 131C, the arm 104 engages the gear locking plate 1 with the index gear left behind.
07 is pushed down against the locking knob 111, the convex portion 119a of the index gear 119 is released from the concave portion of the gear locking plate and becomes rotatable.

When indexed in this way, the output gear 125 is driven by the indexing gear 119, and the gears 133 and 132a
The zoom lens barrel 132 is driven to the telephoto side via.

By operating the release switch, CPU,! l<When instructing lens drive and subsequent shutter drive,
After going through the same steps as above, the index gear 126 is first selected and power is transmitted to drive the lens, and then the index gear 124 is selected to perform forward and reverse rotational movement necessary for opening and closing the shutter. is transmitted to the shutter mechanism.

When winding or unwinding the film, the index gear 118 is indexed by a similar operation, and the winding output gear 1 is engaged with the gear 122a of the film winding spool.
It is clear that 23 is driven.

According to this embodiment, as in the first and second embodiments, a single drive motor can provide a plurality of independent outputs, so the camera can be made compact and provided at low cost. Additionally, since independent outputs can be obtained, it can be standardized as a unit, making it easy to use it for other products. Furthermore, since the power splitting unit is arranged near the drive motor within the spool, the transmission efficiency for film winding is good and the installation space is also advantageous. It should be noted that since a lock spring is of course provided in this embodiment as well, there is no possibility that the camera will malfunction during indexing.

[Effects of the Invention] As detailed above, according to the present invention, the unit mechanism has the following features:
It is advantageous for downsizing cameras because it uses a single drive motor to drive not only the zoom lens barrel, shutter drive, lens drive, and optical system for close-up photography, but also the film winding gear, etc. Not only that, but the mounting for wiring becomes easier, and the cost of parts including the motor and assembly costs are also reduced. Furthermore, it becomes easy to develop the camera system and add functions. For the same reason, it is possible to set a standard mechanism and use it as a common component for many products, making it possible to have a common design for each product, reducing development man-hours, and being advantageous for mass production. be.

Furthermore, according to the present invention, the unit mechanism includes a locking mechanism, and all index gears other than the indexed gear are locked, so that only the desired mechanism, for example, only the zoom lens barrel, is driven, and other index gears are driven. is driven, so that, for example, the shutter, lens, etc. are not driven inadvertently.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing the first embodiment of the present invention, FIG. 2 is a plan view of the main parts thereof, FIG. 3 is a plan view similar to FIG. 2 showing the state at the time of film winding, and FIG. The figure is a plan view similar to Fig. 3 showing the state during rewinding, Fig. 5 is a side view of the drive part, Fig. 6 is a side view of the indexing section and indexing motor section, and Fig. 7 is the second 8 to 11 are diagrams showing a third embodiment of the present invention, FIG. 8 is an exploded perspective view thereof, FIG. 9 is a plan view thereof, and FIG. Figure 10 is a plan view showing the indexing gear 119 in the reference position, Figure 11 is a side view, and Figure 12. Figure 13,
Fig. 14 is a flowchart diagram showing the operation of the 1.2.3 embodiments, and Figs.
．． FIG. 2.3 is a block diagram showing an example of each control circuit in the embodiment. 1... Drive motor lOa.
．． b... Drive gear 11a-lid... Index gear 50, 111... Lock spring 117, 118, 11
9, 120, 121 --- Index gear 123, 124
, 125, 126, 127... Output gear A... Drive gear section B... Indexing section C... Indexing motor section and 4 others 11 Fig. 12 Fig. 13 Fig. 14

Claims (1)

[Scope of Claims] 1. Consists of a drive gear driven by a drive motor and a plurality of index gears each connected to a plurality of mechanisms such as a zoom lens barrel and a shutter drive, and the drive gear is connected to the index gear. The mechanism selectively meshes with one of the indexing gears to transmit the power of the drive motor to the indexing gear, wherein the mechanism includes a locking mechanism, and all indexing gears other than the indexed gear are locked. A power split unit for cameras characterized by: 2. A power split unit for a camera, wherein the indexing gear according to claim 1 also includes a gear connected to a gear of a film winding spool.