JPH11336788A - Driving transmission device and lens mirror cylinder using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving transmission device inexpensive and with a small number of part while mounting a clutch mechanism, a pulse plate and an output gear. SOLUTION: It has a transmission gear 2 to which rotation from a motor is transmitted, an output shaft 3d having a first input gear 3a to be engaged with the transmission gear 2, an output gear 3c coaxially installed on the output shaft 3d and a second input gear 5 to be engaged with the output gear 3c, engagement and disengagement of the transmission gear 2 and the input gear 3a and engagement and disengagement of the output gear 3c and the input gear 5 are carried out by movement of the output shaft 3d in the axial direction, and when moving the output shaft 3d in the engagement direction, the transmission gear 2 and the first input gear 3a are engaged with each other first before the output gear 3c and the second input gear 5 are.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive transmission device having a clutch mechanism and a lens barrel using the same.

[0002]

2. Description of the Related Art Conventionally, in a device equipped with a drive transmission mechanism, for example, a lens barrel, a type incorporating a mechanism for switching between auto focus and manual focus is generally used. A clutch mechanism for switching between automatic and manual by switching the meshing of some gears in the row with teeth, a pulse plate for controlling the number of rotations of the motor, and an output gear for outputting to the outside are provided. However, since an optical sensor for controlling the pulse plate, for example, an interrupter is provided in the drive transmission mechanism, a flexible printed circuit board for communicating the interrupter with a printed circuit board for controlling the rotation of the motor needs to be provided. There was a cost increase.

On the other hand, as a countermeasure, Japanese Patent Application Laid-Open No. 08-07
In Japanese Patent No. 5975, in order to reduce the cost of the above-described drive transmission mechanism, an interrupter for controlling the number of rotations of a motor is provided on a gear base plate or a printed circuit board by using an axial angle conversion mechanism such as a bevel gear for the drive transmission device. Proposals have been made to remove components such as flexible printed circuit boards by installing them on top.

[0004]

However, in the above conventional example, since the number of gears for connecting the gears is large, it is necessary to reduce the number of gears for further cost reduction. A method of reducing the number of gears by using a high torque type motor is conceivable.

On the other hand, there is a limit to the reduction of the number of gears, and it is necessary to provide at least mechanisms such as a gear connection for the clutch mechanism, a gear connection for operating the pulse plate, and a gear connection to the output gear. At present, it is impossible to reduce costs by further reducing the number of gears.

It is an object of the first invention according to the present application to provide a drive transmission device which is inexpensive and has a small number of parts while mounting a clutch mechanism, a pulse plate, and an output gear.

[0007] It is another object of the second and third aspects of the present invention to provide a drive transmission device capable of reliably performing switching by a clutch even when the number of gears is reduced.

An object of the first invention according to the present application is to provide a drive transmission device which is inexpensive and has a small number of components.

A second object of the present invention, in addition to the first object of the present invention, is to provide a drive transmission device capable of reliably switching power transmission.

A third object of the present invention is to provide a lens barrel realizing the first and second objects of the present invention.

[0011]

According to a first aspect of the present invention, there is provided a drive transmission device for transmitting rotation from a drive motor to a plurality of output members. A transmission gear to which rotation is transmitted, an output shaft having a first input gear meshing with the transmission gear, an output gear coaxially mounted on the output shaft, and one or more second gears meshing with the output gear And an input gear.

A second configuration for realizing the object of the first invention according to the present application is a drive transmission device for transmitting rotation from a drive motor to a plurality of output members, wherein the transmission from the motor is transmitted. A gear, an output shaft having a first input gear meshing with the transmission gear, an output gear coaxially mounted on the output shaft, and a gear meshing with the output gear.
Or a plurality of second input gears, and by moving the output shaft in the axial direction, engagement of the transmission gear with the first input gear and release thereof, and the output gear and the second gear The engagement with the input gear and the release thereof are performed.

According to a second aspect of the present invention, there is provided a drive transmission device for transmitting rotation from a drive motor to a plurality of output members, comprising: a transmission gear to which rotation from the motor is transmitted; An output shaft having a first input gear meshing with the transmission gear, an output gear coaxially mounted on the output shaft, and one or more second input gears meshing with the output gear; By moving the output shaft in the axial direction, the transmission gear is engaged with the first input gear and released, and the output gear and the second input gear are disengaged.
When the output shaft is moved in the meshing direction, the transmission gear and the first input gear are disengaged from the output gear and the second input gear. Are also designed to engage first.

In each of the above structures, an axial angle conversion mechanism can be used for transmitting rotation between the output gear and the second input gear, and the bevel gear is used as the axial angle conversion mechanism. And the rotation detection member can be driven to rotate by the rotation output of the second input gear.

According to a third aspect of the present invention, there is provided a drive transmission device having any one of the above-described configurations, wherein a movable lens group is driven by an output shaft of the drive transmission device. Things.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIGS. 1 to 4 show a first embodiment of the present invention.

FIGS. 1 and 2 show an embodiment of a drive transmission device that best illustrates the features of the present invention. FIG. 1 is a diagram at the time of meshing, and FIG. 2 is a diagram at the time of disconnection. 3 is a partial detailed view of FIG. 2, and FIG. 4 is a sectional view of a lens barrel into which the drive transmission device shown in FIG. 1 can be incorporated. 1 and 2,
1 is a motor as a driving source, 2 is a first gear for transmitting rotation of the motor 1, 3a is a drive transmission gear meshing with the first gear 2, 3b is an output gear for transmitting rotation to a driven member, 3
Reference numeral c denotes a pulse transmission gear that transmits rotation to a pulse plate described later, and the drive transmission gear 3a, the output gear 3b, and the pulse transmission gear 3c are configured to be coaxially rotatable.

Reference numeral 4 denotes a pulse plate divided into a plurality of shielding portions and light transmitting portions, and reference numeral 5 denotes a pulse plate 4 having a pulse transmission gear portion 3c.
The second gear 6 meshes with an interrupter, which is an optical sensor having a light emitting portion and a light receiving portion and controlling the rotation of the motor 1 based on the rotation speed of the pulse plate 4.

Reference numeral 7 denotes a coil spring for urging the drive transmission gear 3a upward in the figure, and reference numeral 8 denotes a second gear holding member that holds the second gear 5 rotatably.

Reference numeral 9 denotes a state in which the interrupter 6 is fixed,
The first gear base plate 10 having holes 9a, 9b, 9c is fixed to the motor 1, the second gear base plate having holes 10a, 10b, 10c, and 11 and 12 are the second gear base plate 10.
It is the first pillar integrally formed with the first pillar.

13 is a screw for fixing the motor 1 to the second gear base plate 10, 14 and 15 are screws for fixing the first support 11 and the second support 12 to the first gear base plate 9, and 16 is a second screw for fixing the first gear base plate 9. Screws for fixing the gear holding member 8 to the second gear ground plate 10.

Next, in FIG. 1 having the above-described structure showing the engagement, the rotation generated by the driving of the motor 1 as the driving source is transmitted from the first gear 2 to the driving transmission gear 3a urged by the coil spring 7. Drive transmission gear shaft 3
While rotating d, it is transmitted to a driven member (not shown) by an output gear 3b provided on the shaft 3d.

Similarly, the rotation is transmitted to the second gear 5 by the pulse transmission gear 3c provided coaxially. The second gear 5 is rotatably held by a second gear holding member 8, and rotates the pulse plate 4, which is divided into a shielding part and a light transmitting part, which are integrated with the second gear 5. The interrupter 6 having a light-emitting portion and a light-receiving portion fixed on the first gear base plate 9 detects the signal and provides the control of the rotation speed of the motor 1.

Next, in FIG. 2 of the above-described configuration showing the time of disconnection, the drive transmission gear 3a and the pulse transmission gear 3c can be integrally moved in the axial direction without obstructing the rotation of the shaft 3d. This is a state in which the switch is depressed downward in the figure by the switch and is simultaneously operated, and the transmission with the first gear 2 and the second gear 5 is disconnected.

At this time, as shown in FIG. 3, at the time of disconnection, the distance A between the drive transmission gear 3a and the first gear 2 is larger than the distance B between the pulse transmission gear 3c and the second gear 5. Is configured to be shorter. That is, when the distance B is shorter than the distance A, when the drive transmission gear 3a and the pulse transmission gear 3c are simultaneously moved in the upward direction in the figure by the switch (not shown) in order to perform re-engagement, If the tooth tip of the pulse transmission gear 3c and the tooth tip of the second gear 5 come in contact with each other and the engagement is not reliably performed, the drive transmission gear 3c and the first gear 2 do not engage with each other, so that the motor idles, and The fact that rotation cannot be transmitted to the driving member can be prevented.

In order to perform re-engagement from the state shown in FIG. 3, the drive transmission gear 3a and the pulse transmission gear 3c are simultaneously moved in the upward direction in the figure by the changeover switch (not shown). Since the meshing of the first gear 2 with the gear 3a is performed first by the meshing of the pulse transmission gear 3c with the second gear 5 based on the difference between A and B, the rotation can be reliably transmitted to the driven member. .

Further, by using a cross shaft gear such as a bevel gear for the pulse transmission gear 3c and the second gear 5, the end face of the spur gear, which is a contact area at the time of meshing, as compared with the case where a spur gear is used. Since the bevel gear has a narrower tooth tip, the probability of engagement is high, and rotation can be transmitted reliably.

In FIG. 4, reference numeral 17 denotes an output gear 3b.
The moving lens group is driven by the rotation of the motor 1 as a driving source in the moving lens barrel gear section, and the moving lens group is driven in the optical axis direction.

[0029]

According to the first aspect of the present invention, the rotation from the drive motor can be transmitted to a plurality of output members with a small number of gears.

According to the second aspect of the present invention, the rotation from the drive motor can be transmitted to a plurality of output members via the clutch mechanism with a small number of gears.

According to the invention according to claim 3, claim 1,
In addition to the effects of the invention according to the second aspect, the rotation from the drive motor can be reliably transmitted to the plurality of output members.

According to the fourth and fifth aspects of the present invention, the output gear and the second input gear can be reliably meshed with each other when meshing again.

According to the sixth aspect of the present invention, a rotation detecting member such as a pulse plate for detecting another rotation can also be driven to rotate.

According to the seventh aspect of the present invention, the movable lens group can be smoothly switched between the automatic drive and the manual drive with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a drive transmission device at the time of meshing according to a first embodiment of the present invention according to the present application;

FIG. 2 is a cross-sectional view of the drive transmission device at the time of disconnection according to the first embodiment of the present invention.

3 is a sectional view showing an enlarged portion of the drive transmission device at the time of disconnection in FIG. 2;

FIG. 4 is a sectional view of a lens barrel into which a drive transmission device according to the first embodiment of the present invention can be incorporated;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Motor 2 ... 1st gear 3a ... Drive transmission gear 3b ... Output gear 3c ... Pulse transmission gear 3d ... Drive transmission gear shaft 4 ... Pulse plate 5 ... 2nd gear 6 ... Interrupter 7 ... Coil spring 8 ... 2nd gear holding member 9 First gear base plate 10 Second gear base plate 11 First support 12 Second support 13-16 Screw 17 Moving gear of lens barrel

Claims (7)

[Claims] 1. A drive transmission device for transmitting rotation from a drive motor to a plurality of output members, comprising: a transmission gear to which rotation from the motor is transmitted; and an output shaft having a first input gear meshed with the transmission gear. A drive transmission device comprising: an output gear coaxially mounted on the output shaft; and one or more second input gears meshing with the output gear. 2. A drive transmission device for transmitting rotation from a drive motor to a plurality of output members, comprising: a transmission gear to which rotation from the motor is transmitted; and an output shaft having a first input gear meshed with the transmission gear. And an output gear coaxially attached to the output shaft, and one or more second input gears meshing with the output gear, and moving the output shaft in the axial direction, thereby forming the transmission gear. And a first input gear for meshing and disengaging the output gear, and an output gear engaging and disengaging the second input gear. 3. A drive transmission device for transmitting rotation from a drive motor to a plurality of output members, comprising: a transmission gear to which rotation from the motor is transmitted; and an output shaft having a first input gear meshed with the transmission gear. And an output gear coaxially attached to the output shaft, and one or more second input gears meshing with the output gear, and moving the output shaft in the axial direction, thereby forming the transmission gear. And the first input gear and the disengagement thereof, and the output gear and the second input gear are engaged and disengaged, and when the output shaft is moved in the meshing direction, the transmission is performed. A drive transmission device wherein a gear and a first input gear mesh with each other before the output gear and the second input gear. 4. The drive transmission device according to claim 1, wherein an axial angle conversion mechanism is used for transmitting rotation between the output gear and the second input gear. 5. The drive transmission device according to claim 4, wherein the axial angle conversion mechanism is a bevel gear. 6. The drive transmission device according to claim 4, wherein a rotation detection member is driven to rotate by a rotation output of the second input gear. 7. A lens barrel comprising the drive transmission device according to claim 1, wherein a movable lens group is driven by an output shaft of the drive transmission device.