JP2508704Y2 - Optical device drive for multifocal camera - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical device driving device for switching an optical system of a multifocal camera in association with a focal length switching operation of a lens barrel.

[0002]

BACKGROUND ART The applicant previously proposed a finder driving device bifocal camera shown in FIGS. 7 and 8 (Japanese Patent Application No. Sho
62-58951) . Here, FIG. 7 shows a case where the finder device is in a wide (wide-angle shooting) state, and FIG. 8 shows a tele (telephoto shooting) state.

7 and 8, the camera body 1
An elongated hole 12 is formed in the vertical direction at 0, and two pins 16 erected on the moving member 14 are fitted into the elongated hole 12. As will be described later, a diffusing plate (light transmitting member) 40 for the light from the light emitting portion 42 that constitutes the electronic flash device and a first objective lens 46 that constitutes the finder optical system are integrally fixed to the moving member 14. Has been done. This moving member 14
A rack portion 18 is formed on one side edge of the rack portion 18. The rack portion 18 meshes with a pinion 20, and the pinion 20 meshes with a transmission gear 22. The pinion 20 is biased in the counterclockwise direction by a torsion spring 24, and the moving member 1
4 is always urged upward (wide side). This prevents the moving member 14 from falling under its own weight in the wide state. Further, a part of the tooth portion of the transmission gear 22 is cut out to form a flat portion 26 as well shown in FIG.

A large-diameter drive lens barrel (hereinafter referred to as a drive ring) 30 is rotatably arranged adjacent to the transmission gear 22. The drive ring 30 has a gear portion 32 meshing with the transmission gear 22 and a gear portion 32. Is formed with a raised portion 34 that is continuous. On the outer peripheral surface of the drive ring 30, a gear portion 36 is formed at a predetermined distance from the gear portion 32 and the raised portion 34 in the optical axis direction, and a male helicoid 38 having a small lead angle is formed. The gear portion 36 meshes with a drive gear 37 driven by a motor (not shown). The male helicoid 38 is replaced by a female helicoid of the camera body (not shown).
The drive ring 30 is rotatably supported by the camera body by being screwed into.

A helicoid having a large lead angle is formed on the inner peripheral surface of the drive ring 30, and the helicoid is inserted in the drive ring 30 to hold a lens (a lens optical system LS is held). Meshes with the helicoid formed on the outer peripheral surface of the. The lens holder is a key on the camera body.
Since rotation of the center of the optical axis is blocked by, for example, the rotation of the drive ring 30 causes the lens holding cylinder, that is, the lens optical system LS, to move back and forth in the optical axis direction.

The moving member 14 is integrally formed with a light transmitting portion 40. The light transmitting portion 40 covers at least the front surface of the light emitting portion 42 of the electronic flash device fixedly mounted on the camera body to irradiate light. To spread. An arm portion 44 extending laterally is fixed to the light transmitting portion 40, and a first objective lens 46 is placed on the arm portion 44 so as to vertically move integrally with the moving member 14.

A second objective lens 50, an albada lens 52, a frame glass 54 and an eyepiece lens 56 are arranged on the optical path when the first objective lens 46 is in the raised position. The second objective lens 50 is swingable around the shaft portion 58 in front of the albada lens 52, and a pin 60 projects from one side surface thereof and extends through the elongated hole 64 of the lever 62. The lever 62 can be pivoted around a pin 70 provided upright on the camera body 10, and is biased in the clockwise direction by a torsion spring 74 that is hung between the lever 62 and the pin 72. An abutting portion 76 is formed at the free end of the lever 62 so that it can abut on an arm portion 78 protruding from the side surface of the first objective lens 46. Therefore,
When the first objective lens 46 moves up and down, the lever 62 pivots and the second objective lens 50 turns.

[0008]

In the prior art as described above, there are two parts, a gear part (input side gear) 36 meshing with the drive gear 37 and a gear part (output side gear) 32 meshing with the transmission gear 22. Is formed on the outer peripheral surface of the drive ring 30. Therefore, the gears protrude at two locations on the outer peripheral surface of the drive ring 30. Since the drive ring 30 rotates, a predetermined space is required on the entire circumference of the drive ring 30 by an amount corresponding to those gears, which is a factor that hinders downsizing of the camera.

Further, the meshing portion of the drive gear 37 and the input side gear 36 of the drive ring 30, and the meshing portion of the output side gear 32 of the drive ring 30 and the transmission gear 22 are between the gear portions 32 and 36 in the optical axis direction. There is also a problem that the drive ring 30 is undesirably deformed due to the movement of the drive ring 30 due to the displacement.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical device driving device for a multifocal camera, which saves space and prevents undesired moments from acting on the driving ring.

[0011]

With reference to FIG. 1 showing a Means for Solving the Problems One embodiment, the present invention includes a drive barrel 130 is <br/> rotary drive to the focal length is variable, the drive barrel 130 The lens optical system LS that moves forward and backward along the optical axis LX to obtain the focal length with the rotation of the
An optical device FD to set the optical system to a state that corresponds to the focal length, a row in the same circumferential direction of the outer peripheral surface of the drive barrel 130
Input side gear 136 and output side gear 132 engraved on the
Rotates the drive lens barrel 130 by meshing with the input side gear 136.
The drive gear 3 that transmits the driving force to the drive barrel 130.
7 and the output side gear 132,
Interlocking gear 122 that drives the optical device FD in conjunction with rotation
It is applied to an optical device drive apparatus for a multi-focus camera with bets
It And the above-mentioned problem is that the output gear 132 and the interlocking teeth
Each of the wheels 122 has a predetermined direction of the output gear 132.
The state in which the optical device FD corresponds to one focal length by rotation.
When they are located at
A smooth surface is provided to prohibit the transmission of driving force to the interlocking gear 122.
Only be solved by the Rukoto. The output side gear 132 may be provided so as to overlap with a partial region of the input side gear 136, or the output side gear 132 may be continuously provided so as to extend in the circumferential direction of the input side gear 136.

[0012]

The rotating force of the drive gear 37 is transmitted to the drive lens barrel 130 via the input side gear 136, and the rotating force of the drive lens barrel 130 is transmitted to the interlocking gear 122 via the output side gear 132. By rotating the interlocking gear 122, the optical device FD
Is driven to correspond to the focal length of the lens optical system LS .
The optical system is set to the state . Here, the drive barrel 13
0 is the input side gear 136 and the output side gear 13 in the same circumferential direction.
2 is engraved, that is, outside the drive lens barrel 130.
Since only one gear is engraved on the peripheral surface, the drive mirror
Both gears of the input side gear 136 and the output side gear 132 of the cylinder 130
The mating portions are arranged in a line in a direction orthogonal to the optical axis LX. Ma
In addition, the output side gear 132 is rotated in a predetermined direction by an optical device.
When the FD is in a state corresponding to one focal length,
The smooth surfaces of the output gear 132 and the interlocking gear 122 are in sliding contact with each other.
Of the driving force from the output gear 132 to the interlocking gear 122
Prohibit transmission.

Incidentally, in the section of means and action for solving the above problems for explaining the constitution of the present invention, the drawings of the embodiment are used for the sake of easy understanding of the present invention. It is not limited to.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a bifocal camera will be described with reference to FIGS. 1 to 3 show a wide state, and FIG. 4 shows a tele state. Note that FIG.
The same parts as those in FIG. 8 are designated by the same reference numerals and the description thereof will be omitted. The main difference from the conventional device is that the gear 32 meshing with the transmission gear 22 and the gear 36 meshing with the drive gear 37 shown in FIG.
The point is that the gear 36 and the gear 22 are arranged in a line.

(I) Configuration of the Embodiment As shown in FIGS. 1 and 2, the drive ring 130 includes an input side gear 136 meshing with the drive gear 37 and the gear 1
Between the output side gear 132 formed between the teeth 136a and 136b at both ends of the gear 36 and meshing with the transmission gear 122, and between the teeth 132a at the end of the gear 132 and the teeth 136a at the end of the gear 136. And a raised portion 134. Gear 1
Reference numeral 32 designates the same module which is connected to the terminal gear 136b of the gear 136 in the circumferential direction, and the gear 13 at the boundary thereof.
Only 2b has a large tooth width. This gear 132b is
As will be described later, when the drive ring 130 is turned clockwise when switching from the wide state to the tele state, the drive gear 130 meshes with the notch teeth 122b of the transmission gear 122 at a certain rotational position to transmit the transmission gear 122.
This is to start the rotation of. That is, the gear 132 is configured to mesh only with the teeth in the width region of about half of the entire gear width of the transmission gear 122 on the front side of the camera.

The transmission gear 122 is provided only in a tooth 122a engraved over the entire tooth width of the gear, a notch tooth 122b engraved with a tooth width of about half width, and an angular range in which the notch tooth 122b is engraved. And a flat portion 122c formed on the pinion 20.
Is driven to rotate. When the transmission gear 122 rotates enough to obtain the stroke of the moving member 14 that moves from the telescopic state to the wide state, the flat portion 122c rotates the drive ring 1.
It is provided to prevent the rotational force of 30 from being transmitted to the transmission gear 122. The upper surface of the raised portion 134
Is a flat portion 122 of the transmission gear 122, as shown in FIG.
When c face each other, they are in sliding contact with the flat portion 122c.

By arranging the respective gears as described above, as shown in FIG. 6, the drive gear 37 and the input side gear 13 are provided.
The meshing portion 101 of 6 and the meshing portion 102 of the output side gear 132 and the transmission gear 122 are arranged in a line in the direction orthogonal to the optical axis LX. 1 and 3, FD represents the same finder device as that shown in FIG. 8, and the moving member 14, the first objective lens 46, the second objective lens 50, the albada lens 52, and the frame glass 5 are used.
4, an eyepiece lens 56 and the like.

[0018] (II) Operation of Embodiment Referring to FIGS operation of this embodiment will be described. The state of each part in FIGS. 1 to 3 and the two-dot chain line in FIG.
The state is the position of each component in the wide state,
The moving member 14 rises and the first objective lens 46 is on the optical path (illustrated by 46a in FIG. 5). Therefore, the lever 62
Is rotated counterclockwise by the arm 78 of the first objective lens 46, the second objective lens 50 swings upward and is in a horizontal state (shown by 50a in FIG. 5), and the optical axis of the finder optical system. Have been evacuated from. As a result, the first objective lens 4
6, the albada lens 52, the frame glass 54, and the eyepiece lens 56 constitute a finder optical system for wide shooting. At this time, the light transmitting portion 40 is in front of the light emitting portion 42, and the flash light emitted by the light emitting portion 42 is diffused and irradiated toward the object.

When a command to switch the focal length to the telephoto state is issued from the state shown in FIGS. 1 to 3 by an operation button (not shown), a drive device (not shown) operates and the drive gear 37 rotates counterclockwise. This causes the drive ring 130 to rotate right. At the beginning of rotation of the drive ring 130, the gear 136 is the flat portion 12 of the transmission gear 122.
Slide on 2c. When the gear 132b meshes with the tooth at the end of the notched tooth 122b of the transmission gear 122, the transmission gear 122b
Starts to rotate counterclockwise, and the gear 132 and the tooth 122a mesh with each other.

When the meshing of the two starts, the gear 122 turns left and the pinion 20 turns right. As a result, the movable member 14 descends while the pin 16 is guided by the elongated hole 12, the light transmissive member 40 retreats from the front of the light emitting portion 42 of the electronic flash device, and the first objective lens 46 functions as a finder optical system. Evacuate downward from the optical axis.

When the first objective lens 46 descends, the arm 78 also descends at the same time, so that the lever 62 is rotated rightward by the urging force of the spring 74, and the lever 60 is engaged with the pin 60 and the long hole 64. The second objective lens 50 is rotated right about the shaft 58. The second objective lens 50 is a stopper 55 shown in FIG.
When it comes into contact with the lens, it stands upright parallel to the albada lens 52. In this way, the second objective lens 50, the albada lens 52, the frame glass 54, and the eyepiece lens 56 constitute a finder optical system during telephotographing (shown by the solid line in FIG. 5). Incidentally, as seen from FIG. 4 showing a telescopic state, even if the drive ring 130 is further right-, Sheng upper portion 13
The upper 4 flats 122c is slid transmission gear 122, the rotation of the drive ring 130 is not transmitted to the transmission gear 1 22, the first objective lens 46 and the second objective lens 50
No additional driving force is applied to. In addition, in tele state
In addition, the raised portion 134 and the flat portion 122 of the transmission gear 122
Since it is always in sliding contact with c,
The transmission gear 122 idles due to the biasing force, and the moving member 14
It doesn't move carelessly.

From the state shown in FIG. 4, when the focal length is switched to the wide state by an operation button (not shown), each component operates in the opposite direction to that described above, and the left-handed gear 1 is operated.
Reference numeral 32 meshes with the teeth 122 a of the transmission gear 122, the transmission gear 122 rotates right, the pinion 20 rotates left, and the first objective lens 46 rises. Along with this, the lever 62 is rotated counterclockwise by the arm portion 78, and the second objective lens 50 is rotated counterclockwise through the engagement between the pin 60 and the long hole 64 to be in a horizontal state as shown in FIGS. . As a result, the first objective lens 46, the albada lens 52, the frame glass 54, and the eyepiece lens 56 constitute a finder optical system at the time of wide-angle photography (shown by a chain double-dashed line in FIG. 5).

Further, since the pinion 20 is biased in the counterclockwise direction by the spring 24, the pinion 20 is rotated clockwise, that is, the moving member 14 is lowered against the action of the spring 24. Further, since the lever 62 is biased in the clockwise direction by the spring 74, the lever 62 is counterclockwise rotated, that is, the second objective lens 50 is counterclockwise rotated against the action of the spring 74. By the action of the springs 24 and 74, the engagement between the pin 60 and the slot 64 and the arm 78
The contact between the lever contact portion 76 and the lever contact portion 76 is ensured, and the backlash between the transmission gear 122 and the pinion 20 and between the pinion 20 and the rack portion 18 is removed. Further, as shown in FIG. 6, the meshing portion 101 of the driving gear 37 and the input side gear 136, and the meshing portion 102 of the output side gear 132 and the transmission gear 122 are arranged in a line in the direction orthogonal to the optical axis LX, and the driving mirror Since the moment does not work on the barrel 130, the deformation of the driving lens barrel 130 is prevented.

(III) Modified Example In the above, the input side gear 136 and the output side gear 132 are provided.
Although the and are provided in different angular regions on the same circumference, they may be overlapped in the same angular range. Also, both gears 1
Although 32 and 136 are respectively provided in series, they may be separated by a certain angle as long as they are on the same circumference. Further, in the above embodiment, the rotation of the transmission gear 122 is started by the tooth 132b having a wide tooth width, but the present invention is not limited to this, and the rotation may be given by another member. Furthermore, the gear 37,
As long as 136, 132, 122 are arranged in a line as shown in FIG. 6, any other structure such as the finder device FD may be used. In addition, the examples and claims described above
In correspondence with the enclosure, the finder device FD is an optical device.
The transmission gear 122 is an interlocking gear, and
The upper surfaces of the carrier portion 112C and the ridge portion 134 are smooth surfaces.
Each is composed.

[0025]

According to the present invention, the input side gear for transmitting the rotational drive force from the drive gear to the drive barrel and the output gear for outputting the interlocking gear for driving the optical device from the drive barrel. since the output side gear is formed in the same circumferential direction of the driving barrel, it may be engraved only one place gear on the outer peripheral surface of the drive barrel, therefore, to effectively use the space of the outer periphery of the driving barrel be able to. Also, with such a configuration,
When driving the optical device, the meshing parts of the input side gear and the output side gear of the drive lens barrel are aligned in a line in the direction orthogonal to the optical axis.
In addition, the moment due to the transmission force of the gear does not act on the drive barrel, and as a result, the drive barrel can be prevented from being undesirably deformed.
Further, when the drive lens barrel is formed by molding, the shape can be simplified and the mold itself can be constructed at low cost. Ma
Also, the rotation of the output side gear in the predetermined direction causes the optical device to
When positioned in the state corresponding to the focal length, the output side gear
And the smooth surfaces of the gears are in sliding contact with each other
Since the transmission of driving force to the gears is prohibited,
After the device is in the specified state, the optical device is operated by the output side gear.
Is never driven unnecessarily.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating the overall configuration of an embodiment of a finder device according to the present invention.

FIG. 2 is a perspective view illustrating a part of an embodiment of the finder device according to the present invention.

FIG. 3 is a perspective view illustrating a part of an embodiment of a finder device according to the present invention.

FIG. 4 is a front view for explaining an embodiment of the finder device according to the present invention.

FIG. 5 is an operation explanatory view of the finder device according to the present invention.

FIG. 6 is a layout view of gears of the finder device according to the present invention.

FIG. 7 is a perspective view showing an example of a conventional finder device.

FIG. 8 is a front view showing an example of a conventional finder device.

[Explanation of symbols]

14 moving member 18 rack part 20 pinion 24 spring 37 drive gear 28 helicoid 40 diffuser plate 42 light emitting part 46 first objective lens 50 second objective lens 52 albada lens 54 frame glass 56 eyepiece 122 transmission gear 122a tooth 122b notched tooth 122c flat portion 132 output gear 134 overlaid on 136 input-side gear LX optical axis LS lens optical system FD finder

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kiyosada Machida Kiyosada Machida 1-6-3 Nishioi, Shinagawa-ku, Tokyo Nihon Kogaku Kogyo Co., Ltd. (72) Inventor Yuji Katano 1-6 Nishi-oi, Shinagawa-ku, Tokyo No. 3 Japan Optical Industry Co., Ltd. Oi Works (72) Minor Kato 1-6-3 Nishiooi, Shinagawa-ku, Tokyo Japan Optical Industry Co., Ltd. Oi Works

Claims (3)

(57) [Scope of utility model registration request] 1. A driving barrel is rotation driven to the focal length is variable, and forward and backward along the optical axis in accordance with rotation of the driving barrel the
A lens optical system that obtains a focal length and a lens optical system that corresponds to the focal length in association with the rotation of the driving lens barrel.
An optical device for setting the optical system in the state, which is engraved in a row in the same circumferential direction of the outer peripheral surface of the driving barrel
The input side gear and the output side gear are meshed with the input side gear to rotationally drive the drive barrel.
A drive gear that transmits force to this drive barrel is meshed with the output side gear, and interlocks with the rotation of the drive barrel.
And a multi-focus with an interlocking gear that drives the optical device
In the optical device driving device of the camera, the output side gear and the interlocking gear are respectively provided with an output side.
The rotation of the gear in a predetermined direction causes the optical device to have a single focal length.
When they are in a state that corresponds to the separation,
Prohibit transmission of driving force from the output gear to the interlocking gear
An optical device driving device for a multifocal camera, characterized in that a smooth surface is provided . 2. The optical system for a multifocal camera according to claim 1, wherein the output side gear is provided so as to overlap with a partial area of the input side gear. Device drive. 3. The optical system for a multifocal camera according to claim 1, wherein the output-side gear extends in the circumferential direction of the input-side gear and is continuously provided. Device drive.