JP3387686B2 - Driving force transmission device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving force transmission device for moving a lens barrel for focusing, zooming, etc., which is used in a small optical device such as a camera.

[0002]

2. Description of the Related Art Conventionally, a driving force transmission device of this type has a large number of gears arranged in parallel with each other, and a large number of fixed members protruding from a first plate-shaped frame (ground plate) orthogonal to the axis of each gear. The gear is rotatably fitted to the shaft, and the fixed shaft is inserted and supported in the shaft insertion hole of the second plate frame which is directly opposed to the first plate frame and is spaced from the first plate frame. Then, electric parts such as a motor, an automatic / manual switching (hereinafter referred to as A / M) switch, and an interrupter are installed in the first plate-shaped frame or the second plate-shaped frame, and as a whole, one unit ( Hereinafter, referred to as a gear unit).

On the other hand, a printed wiring board on which electric parts and circuits for driving the driving force transmission device are mounted is constructed as a unit different from the gear unit (hereinafter referred to as a main board unit), The electric components of the unit are connected by a flexible printed circuit board.

Further, in order to eliminate the flexible printed circuit board, electric parts such as a motor, an A / M switch and an interrupter are directly mounted on the main circuit board, and when the lens barrel is assembled, the electric circuit in the gear unit is not used. A gear unit and a main board unit configured to connect the electric components have also been proposed.

FIG. 5 is a longitudinal sectional view showing a conventional driving force transmission device in which a flexible printed circuit board is omitted.

In FIG. 5, 201 is a gear base plate, and 202
Is a main substrate, 203 is a motor provided on the main substrate 202, 204 to 211 are fixed shafts 205a to 208a protruding from the gear base plate 201, gears rotatably fitted to the other shafts 210a and 211a, and 212 to 218 are Electrical components 219 provided on the main board 202 are fixed shafts 204a to 204a.
It is a gear pressing base plate that fits and supports the tip small diameter portion of 10a, and both ends of the gear pressing base plate 219 are attached to the gear base plate 201 with screws 230.

Reference numeral 220 is a fixed portion. Gear unit A
Is composed of the gear base plate 201, the gears 204 to 211, and the gear pressing base plate 219. The main board B is composed of the main board 202, the motor 203, and the electric components 212 to 218. The gear unit A and the main board B are configured independently, and the gears in the gear unit A and the main board B are assembled at the time of assembly.
The motor main body, the pulse plate in the gear unit A, the interrupter in the main board B, the switching member in the gear unit A, the switch in the main board B, etc.
1 and the main substrate 202 covering the opening surface thereof are simultaneously fixed to the fixing portion 220 with screws 231.

FIG. 6 is a vertical cross-sectional view showing a state where the driving force transmission device is incorporated in a lens barrel. In FIG.
Reference numeral 220 is a fixed cylinder as a fixed portion, and a lens mount 220a to be mounted on a camera body (not shown) is integrally molded. 221 zoom operation ring which can be rotated at a fixed position by fitted to the tip outside of the fixed cylinder 220 screws 222, 223 Zumugomu was wound on the outside of the zoom operation ring 221, 224 to the zoom operation ring 221 The first cam barrel is coupled and regulated in the optical axis direction, and is rotatably arranged with respect to the fixed barrel 220. The lead screw 224a is formed on the inner peripheral surface of the first cam barrel 224. Has been done.

Reference numeral 225 is a second barrel member having a screw 225a screwed to the lead screw 224a and a sleeve 225b on the outer peripheral surface thereof, and holds the lens unit L2. Reference numeral 226 is a linear guide member whose one end is fixed to the fixed cylinder 220 with a screw 227 and which penetrates the sleeve 225b.

Reference numeral 228 is a second cam cylinder, and the second cam cylinder 228 has a substantially spiral projection which engages with cam followers 224c and 224d provided on the outer peripheral surface of the first cam cylinder 224 on the inner peripheral surface thereof. A cam 228b is provided, and a protrusion 228a formed on the outer peripheral surface of the rear end of the cam 228b is engaged with a straight guide groove 220b provided on the fixed barrel 220.

Reference numeral 229 is a helicoid 229 provided on the inner peripheral surface.
a is a first lens barrel member that is helicoidally coupled with a helicoid 228c formed on the outer peripheral surface of the distal end portion of the second cam barrel 228, holds the lens unit L1, and holds the helicoid 2
The gear 210 meshes with a threaded portion 229b formed on the inner peripheral surface of the tip from 29a. This gear 210 is the motor 20
3 is integrally provided on a shaft 209 that is gear-interlocked. Two
The third lens barrel member 30 is provided at the rear end of the fixed barrel 220 and holds the lens unit L3.

In the lens barrel having the above structure,
When the zoom operation ring 221 is rotated, the zoom operation ring 2
21, the first cam barrel 224 is rotated by the same amount in the same direction, and the second mirror is inserted via a screw 225a screwed with a lead screw 224a formed on the inner peripheral side of the first cam barrel 224.
The tubular member 225 is guided by the linear guide member 226 and moves in the optical axis direction to perform zooming.

Further, the second cam barrel 228 is linearly guided by the rotation of the first cam barrel 224. The second cam barrel 228 is fitted in the cam floors 224c and 224d of the first cam barrel 228b. And moved straight, and was helicoidally connected to the second cam barrel 228.
The first barrel member 229 moves back and forth in the optical axis direction to perform zooming.

On the other hand, when the shaft 210a is rotated by the motor 203 of the driving force transmission device shown in FIG. 5, the first lens barrel member 22 is passed through the screw 229b screwed with the gear 210.
Only 9 moves straight in the direction of the optical axis for focusing.

[0015]

However, in the above-mentioned conventional example, since the gear unit A and the main board unit B, which are separately and independently configured, are simultaneously fixed to the fixing portion 220, a motor, an A / M switch, an interrupter, etc. Even when the electric components are mounted on the main board 202, the fixing portion 220 is always present for positioning the gear unit A and the main board unit B, so that it is difficult to assemble them with high accuracy.

Further, in the conventional structure, dust may be scattered on the main substrate 202 of the driving force transmission device to cause a short-circuit of electric parts, and solder flux on the main substrate 202 may be scattered to adhere to the lens to improve the optical performance. There were also problems such as the possibility of lowering it.

It is an object of the present invention to provide a driving force transmission device which solves the above conventional problems.

[0018]

Driving force of the invention according to claim 1
The transmission device encloses the motor and the driving force transmission mechanism or
Partitioning device housing and device mounted on the opening surface of this device housing
A driving force transmission device including an outer plate, the device outer plate
And a motor for driving the driving force transmission mechanism,
Consists of a hard printed circuit board on which electrical components are mounted,
Enclose the electrical components on the rigid printed circuit board
The cover part is formed integrally with the device housing, and the cover is attached to the device housing.
It is characterized by being integrated by attaching the device outer plate.
It is a sign.

The invention of claim 2 is the same as the invention of claim 1.
The rigid printed circuit board includes the driving force transmission mechanism.
It has a shaft hole into which the fixed shaft of the constituent gears is inserted.
It is a sign. The invention of claim 3 is the same as the invention of claim 1.
The device housing holds a lens.
is doing.

[0020]

【Example】

First Embodiment FIG. 1 is a sectional view taken along the line II-II of FIG. 2 of a driving force transmission device according to a first embodiment that best represents the features of the present invention.
FIG. 2 is a plan view of the driving force transmission device of FIG. 1.

In FIG. 1 and FIG. 2, reference numeral 1 denotes a housing of a driving force transmission device, which has a shallow box shape, and a large number of gears 4 to 11 are arranged in an internal space. Fixed shafts 5a to 8a for rotatably supporting the gears are provided on the inner wall surface of the housing 1 so as to project, and other shafts 10a and 11a are provided.

A hard printed circuit board 2 as an apparatus outer plate on which the motor 3 and the electric components 12 to 18 are mounted is fastened to the opening surface of the housing 1 with screws 21 or the like. The rigid printed circuit board 2 is brought into contact with the fixed shafts 5a to 8a of the gears 5 to 8 or one end surface of the boss portion to prevent the gears from moving in the axial direction and penetrate the rigid printed circuit board 2. The fixed shaft 5a to
By fitting the tip small diameter portion of 8a, the fixed shafts 5a to 8a also function as bearings.

A cover portion 1a having substantially the same shape as that of the rigid printed circuit board 2 is integrally formed on the casing 1, and the cover portion 1a is formed by connecting the casing 1 and the rigid printed circuit board 2 with screws. The above-mentioned electric component 1 when fastened with
2 to 18 are surrounded, and external dust and dust are electric components 12
To 18 and prevent the solder flux attached to the rigid printed circuit board 2 from flying and adhering to the lens.

FIG. 3 is a longitudinal sectional view showing a state in which the driving force transmission device of the first embodiment is incorporated in a lens barrel.
Is a fixed cylinder as a fixed portion, 22 is a zoom operation ring fitted to the outside of the tip of the fixed cylinder 20 and can be rotated at a fixed position by a screw 21, 23 is a zoom rubber, 24 is a first cam cylinder, and 25 is a Second lens barrel member, 26 is a straight guide member, 2
7 is a screw, 28 is a second cam barrel, 29 is a first barrel member, 3
Reference numeral 0 denotes a third lens barrel member, and L1 to L3 denote lens groups, which have the same configuration and operation as those of the conventional apparatus shown in FIG.

Second Embodiment FIG. 4 is a vertical sectional view showing a state in which a driving force transmission device according to a second embodiment of the present invention is incorporated in a lens barrel, and the same parts as those of the first embodiment. Are denoted by the same reference numerals and redundant description will be omitted.

The casing 101 of the driving force transmission device in the second embodiment is shaped so as to also serve as a lens holding frame for holding the lens L on its inner diameter side.
Therefore, as a driving force transmission device with a lens attached,
Since it is fixed to the fixing portion 20 of the optical device, the third barrel member 30 in the first embodiment can be eliminated.

[0027]

According to the present invention, the drive force transmission device is a single unit in which the drive force transmission mechanism, the motor for driving the drive force transmission mechanism, and the electric parts are integrated, thereby improving the ease of incorporation into the lens barrel. To do. Further, as compared with the conventional method of positioning the device housing and the rigid printed circuit board through another member such as a fixed cylinder, the rigid printed circuit board and the device housing are directly positioned, so that both are fixed. It can be performed easily and with high accuracy. As a result, it is possible to easily and accurately assemble the driving force transmission mechanism in the device casing, the motor and the electric parts on the hard printed circuit board for driving the mechanism, such as the gear and the motor. In addition, the cover part that surrounds the electrical components on the hard printed circuit board can protect the electrical components from dust and dirt, prevent the solder flux on the substrate from adhering to the lens, and improve the component strength of the unit. . And so on.

[0028]

[Brief description of drawings]

FIG. 1 is a sectional view taken along line II-II of FIG. 2 showing a driving force transmission device according to a first embodiment of the present invention.

FIG. 2 is a plan view of the driving force transmission device of FIG.

FIG. 3 is a cross-sectional view showing a state in which the drive transmission device of FIG. 1 is incorporated in a lens barrel.

FIG. 4 is a sectional view showing a state in which a driving force transmission device according to a second embodiment of the present invention is incorporated in a lens barrel.

FIG. 5 is a sectional view illustrating a conventional driving force transmission device.

6 is a cross-sectional view showing a state in which the driving force transmission device of FIG. 5 is incorporated in a lens barrel.

[Explanation of symbols] 1 Drive power transmission device casing (device casing) 1a cover part 2 Rigid printed circuit board (apparatus outer plate) 4-11 gears 12-18 electrical parts

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) G02B ⁷ /02-7/16 G03B 17/02

Claims (3)

(57) [Claims] 1. A driving force transmitting device including a motor and a partition surrounding or the driving force transmitting mechanism apparatus housing, and a mounting rather instrumentation <br/>置外plate opening surface of the apparatus housing, The motor outer plate and the motor for driving the driving force transmission mechanism.
And a rigid printed circuit board on which electrical components are mounted, and surrounds the electrical component on the rigid printed circuit board.
And a cover part formed integrally with the device housing,
A driving force transmission device characterized by being integrated by attaching the device outer plate to a body . 2. The rigid printed circuit board is provided with the driving force.
It has a shaft hole into which the fixed shaft of the gear that constitutes the transmission mechanism is inserted.
The driving force transmission device according to claim 1, wherein: 3. The driving force transmission device according to claim 1, wherein the device housing holds a lens.