JPH0675150B2 - Camera lens barrel drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention relates to a lens barrel drive of a camera, in which one electric motor winds and rewinds a film and drives a lens barrel (telewide or zoom). Regarding the device.

[Prior art]

Recently, the automation of cameras has progressed, and film winding at the time of shooting, film rewinding after the shooting, and switching of the focal length of the shooting lens have been electrified.

In a camera having a focal length variable mechanism such as a zoom mechanism and a tele-wide switching mechanism, for film winding,
If a dedicated motor is provided for electrically adjusting the focal length in addition to the film rewinding motor, the size of the camera becomes large.

Further, when the film hoisting mechanism, the film rewinding mechanism, and the focal length switching mechanism are driven by one motor, the clutch mechanism capable of switching in three directions has a drawback that a complicated mechanism is required.

Conventionally, in addition to the first clutch that switches between film winding and film rewinding, a second clutch that switches between the film rewinding mechanism and the focal length switching mechanism is used.
A camera has been proposed in which three clutch mechanisms, a film winding mechanism, a film rewinding mechanism, and a focal length switching mechanism, are selectively switched (Japanese Utility Model Publication No. 60-110835).
In this case, the first clutch is first switched to the film hoisting mechanism to wind up one frame of film, then the first clutch is switched from the film hoisting mechanism to the film rewinding side, and the second clutch is moved to the focal length. After switching to the switching mechanism to drive the lens, after shutter release, the first clutch is switched to the film winding mechanism again, and then this operation is repeated to shoot all frames, and after the shooting is completed, the first clutch is moved to the rewinding side. At the same time as switching, the second clutch is switched to the rewinding mechanism to rewind the film.

[Problems to be solved by the invention]

However, this normal hoisting type camera requires an external operation member for switching the second clutch,
A complicated switching interlocking mechanism is required between the external operating member and the collapsible mechanism, which is more complicated.

By the way, in such a camera, it is necessary to retract the camera in order to make it a thin camera due to design requirements. When the main switch is turned on → off, the gear coupling of the focal length switching mechanism is forcibly connected to the wide side, the lens barrel is stored in the retracted state, and when the main switch is turned on → off, the focal length switching mechanism It is necessary to forcibly connect the gear connection to the tele side and pull out the lens barrel from the retracted state to the wide end.

The present invention can easily switch the rotational force of the motor to the film winding mechanism, the film rewinding mechanism, and the focal length switching mechanism by simply changing the rotation direction of the motor without using a complicated switching mechanism. Proposes a lens barrel drive for a camera that switches the focal length switching mechanism to the wide side when the main switch is off and retracts it, and switches the focal length switching mechanism to the tele side when the main switch is on to pull out to the wide end to enable shooting. The purpose is to do.

[Means for solving problems]

In order to achieve the above object, the present invention provides a camera in which a film is wound by forward rotation of an electric motor, and rewinding of the film or focal length switching is performed by reverse rotation of the electric motor. A focal length switching lever for moving the lens barrel to the telephoto side or the wide side by the rotational force from the electric motor by being operated by being connected to the distance switching mechanism is provided, and the switching lever is a lens mirror when the main switch is turned off. It is characterized in that it is held on the wide side by the guide groove formed in the body, and is held on the tele side by the guide groove when the main switch is turned on.

[Action]

According to the present invention, the film is wound by the forward rotation of the electric motor, and when the focal length switching lever is operated, the electric motor is rotated in the reverse direction to drive the lens barrel to the tele side or the wide side. Further, when the film end is detected after the photographing is finished, the electric motor rotates in the reverse direction, and the rewinding clutch mechanism is connected to the rewinding mechanism to rewind the film.

When the main switch is turned off, the gear coupling of the focal length switching mechanism is connected to the wide side, and the lens barrel is retracted and stored. Further, when the main switch is turned on, the gear coupling of the focal length switching mechanism is connected to the tele side, and the lens barrel is pulled out from the retracted state to the wide end.

〔Example〕

Hereinafter, preferred embodiments of a lens barrel driving device for a camera according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, the output gear 12 of the motor 10 is the gear 14 → 16 →
It is connected to the sun gear 28 via a transmission path of 18 → 20 → 22 → 24 → 26. The arm 30 is pivotally supported by the central axis 28A of the sun gear 28. A pin 30A is erected at the end of the arm 30, and a planetary gear 32 pivotally supported by the pin 30A meshes with the sun gear 28. The sun gear 28, the arm 30, and the planetary gear 32 form a planetary clutch mechanism. The planet gear 32 is switched to either the gear 34 of the film winding mechanism or the gear 36 of the focal length switching mechanism depending on the rotation direction of the sun gear 28.

As shown in FIG. 1, the gear 34 of the film winding mechanism meshes with a spool gear 40 provided at the upper end of a spool 38. A claw 42 that meshes with the perforation of the film is formed on the outer periphery of the spool 38, and a gear 44 is formed at the lower end thereof, and this gear 44 meshes with gears 46 → 48. A one-tooth gear 50 is provided coaxially with the gear 48,
In this one-tooth gear 50, the leader portion of the film is the claw of the spool 38.
The film is fed at the beginning until it is wound into 42.

Next, the focal length switching mechanism will be described.

The wide-side gear 52 or the tele-side gear 58 meshes with the gear 36 of the focal length switching mechanism. That is, the gears 52, 54, 56 and 58 are pivotally supported by the first tele-wide switching lever 60, and the first tele-wide switching lever 60 is coaxially supported by the shaft 56A of the gear 56. When the first tele-wide switching lever 60 rotates counterclockwise and the gear train 52 → 54 → 56 meshes with the gear 36, it is the gear train when driving in the wide direction. When 60 rotates in the clockwise direction around the shaft 56A and the gear train 58 → 56 meshes with the gear 36, it is a gear train at the time of driving in the tele direction.

Further, the gear 56 meshes with a gear 62, and the gear 62 meshes with an encoder gear 64. A pin 66 is erected on the lower surface of the encoder gear 64 at an eccentric position, and the pin 66 is fitted in the long hole 70 of the lens barrel 68. Therefore, when the encoder gear 64 rotates, the lens barrel 68 moves back and forth. A sliding piece (not shown) is provided on the encoder gear 64 to detect the tele position, the wide position, and the barrier closed position.

Next, the holding mechanism of the first tele-wide switching lever 60 will be described mainly with reference to FIGS. A pin 61 is planted at one end of the first tele-wide switching lever 60. On the other hand, a substantially rectangular opening 74 is formed in the upper surface 72 of the lens barrel 68 integrated with the camera body, and a substantially rectangular guide piece 76 is located in this opening 74 and is guided by the guide piece 76. The guide groove formed guides the pin 61 of the first tele-wide switching lever 60. The guide groove 78A between the tele end and the wide end is free when the pin 61 is located in the guide groove 78A formed in the tele direction and the wide direction, and thus the first tele wide switching lever 60 is provided. Can be switched to either tele or wide. Also, as shown in FIG. 2, the guide groove 78B between the wide end and the barrier closed position is formed only in the wide direction, and when the main switch is turned off, the first tele-wide switching lever is opened.
The lens barrel 60 is held so as to be forcibly connected to the gear on the wide side between the wide end and the collapsing operation, and the lens barrel 68 is housed therein. Also, as shown in FIG.
A guide groove 78C is formed in the tele direction in parallel with the guide groove 78B, so that when the main switch is turned on, the lens barrel 68 is forcibly connected to the tele gear when the lens barrel 68 is pulled out from the retracted state to the wide end. It has become.

Next, the film rewinding mechanism will be described. A gear 80 is formed coaxially with the gear 26, and a sun gear 82 meshes with the gear 80. A rewinding arm 86 is pivotally supported on the shaft 84 of the sun gear 82, and a pin 88 is erected at one end of the rewinding arm 86. A planetary gear 90 that meshes with the sun gear 82 is pivotally supported on the pin 88. Has been done. The rewind arm 86 switches depending on the direction of rotation of the sun gear 82, which causes the planet gear 90 to move to the gear 92.
Mesh with or leave.

The gear 92 is connected to the rewinding gear train 94 → 96 → 98 → 100 → 102, and the lower surface of the gear 102 is provided with a patrone fork 104 that engages with the core of the film patrone.

Next, the second tele-wide switching lever will be described. As shown in FIG. 1, a substantially T-shaped guide groove 108 is formed in the second tele-wide switching lever 106, and a pin 110 provided at the other end of the rewinding arm 86 is loosely fitted in the guide groove 108. Has been done. A zoom knob 106A is formed at one end of the second tele-wide switching lever 106, and when the zoom knob 106A is set to the wide position W, the pin 110 of the arm 86 moves to the wide position W of the guide groove 108 as shown in FIG. Located in
When the zoom knob 106A is set to the tele position T, the arm
The pin 110 of 86 is located at the T position of the guide groove 108. arm
86 is held by the guide groove 108 at the tele position or the wide position so that the planet gear 90 does not mesh with the rewind-side gear 92 carelessly.

A spring 112 is provided at the other end of the second tele-wide switching lever 106, and the spring 112 serves as the first tele-wide switching lever 60.
The bent pieces 114 are sandwiched. Therefore, when the zoom knob 106A of the second tele-wide switching lever 106 is set to the wide position W, the first tele-wide switching lever 60 rotates counterclockwise about the axis 56A in accordance with the movement of the second tele-wide switching lever 106. When the zoom control 106A is moved to form a wide-direction gear series and the zoom knob 106A is set to the tele position T, the first tele-wide switching lever 60 rotates clockwise to form the tele-direction gear series. It has become.
At this time, since the first tele-wide switching lever 60 is connected to the second tele-wide switching lever 106 via the spring 112, it is possible to absorb a shock at the time of gear engagement and smoothly engage the gears.

Further, when the knob 106A is in the neutral position N and the motor 10 rotates in the reverse direction, the pin 110 of the rewinding arm 86 enters the R position of the guide groove 108 as shown in FIG. The 106 is locked when the film is rewound so that the zooming operation is not inadvertently performed. The guide groove 108 is formed with notches 108A, 108A at the entrance of the groove at the R position so that the pin 110 is not accidentally locked in the groove at the R position when the zoom knob 106A is at the neutral position N. There is.

Further, the second tele-wide switching lever 106 has a return spring 116.
When the second tele-wide switching lever 106 is set to the wide position W or the tele position T, the return spring 116 exerts a force to return to the neutral position N. Further, a zoom switch 118 is provided on the second tele-wide switching lever 106, and this zoom switch 118 is a switch piece 118A provided on the switching lever 106.
And a fixed contact piece 118B on the camera body side.
The zoom switch 118 is turned on when the knob 106A is set to the wide position W or the tele position T, drives the motor 10 in reverse, and is turned off at the neutral position N,
It is designed to stop the motor 10.

Next, the stopper mechanism of the rewinding arm 86 at the neutral position will be described. When the second tele-wide switching lever 106 is set to the neutral position N, the rewinding arm 86 does not restrain the pin 110 of the rewinding arm 86 at the horizontal portion of the guide groove 108, so that the rewinding arm is inadvertently caused by vibration or the like. 86 rotates counterclockwise around the shaft 84 and the planet gear 90
May mesh with the gear 92 of the rewind mechanism. Therefore, in the embodiment according to the present invention, the one-tooth stopper 12 is used as the stopper member.
0 is provided. As shown in FIG. 7, the one-tooth stopper 120 has a tip end having the same tooth shape as the teeth of the planetary gear 90. When the second tele-wide switching lever 106 is set to the neutral position N, the rewinding arm 86 rotates counterclockwise and the gear 90 tries to mesh with the gear 92 of the rewinding mechanism, as shown in FIG. As shown, the one tooth stopper 120 blocks the gear 90 from meshing with the gear 92 of the rewinding mechanism.
In addition, when set at the time of rewinding shown in FIG.
To connect 90 to the rewind mechanism gear 92, rewind arm
When 86 rotates counterclockwise, planet gear 90 stops by one tooth.
Since the tip end portion 120A of the gear 120 is formed in the tooth profile of the planetary gear 90, the gear 90 can ride over the tip end 120A of the one-tooth stopper 120 while overcoming and meshing with the gear 92 of the rewinding mechanism.

The operation of the embodiment of the lens barrel driving device for a camera according to the present invention constructed as described above is as follows.

First, the film winding operation will be described. In FIG. 1, when the motor 10 rotates forward, the gears 12 → 14 → 16 → 18 → 20.
Rotational force is transmitted to the sun gear 28 by the gear sequence of → 22 → 24 → 26 → 28. As a result, the planetary gear 32 meshes with the gear 34 by the rotational force of the sun gear 28, and the spool 38 rotates counterclockwise by the gear series 32 → 34 → 40 of the film winding mechanism, and the film (not shown) is wound onto the spool 38. Will be done.

The film rewinding operation is performed as follows. When the second tele-wide switching lever 106 is set to the neutral position N and the sensor (not shown) detects the film end, the motor 10 is rotated in the reverse direction, and the rotational force of the motor 10 is changed to the gear 12 →
It is transmitted to 14 → 16 → 18 → 20 → 22 → 24 → 80 → 82. As a result, the rewinding arm 86 rotates counterclockwise around the shaft 84 by the rotational force of the sun gear 82, and the planetary gear 90 moves to the one-tooth stopper.
The gear 92 of the rewinding mechanism rotates while meshing with 120
Will come to mesh with. At this time, the pin 110 provided at the end of the rewinding arm 86 locks the second tele-wide switching lever 106 at the R position of the guide groove 108, and the second tele-wide switching lever 106 is inadvertently set to tele or wide. It doesn't move to a position.

Next, the operation of the focal length switching mechanism will be described. First, when the zoom knob 116A is in the neutral position N, the telewide switch 118 is off and the motor 10 does not rotate. Next, when the knob 106A is held at the tele position T against the biasing force of the spring 116, the motor 10 causes the tele wide switch 11 to move.
8 is turned on and driven in reverse rotation, the rotational force from the motor 10 is transmitted to the gears 12 → 14 → 16 → 18 → 20 → 22 → 24 → 26 → 28 → 32, and is connected to the gear 36 of the focal length switching mechanism. To be done. At this time, the first tele-wide switching lever 60 rotates clockwise about the shaft 56A, and the gear 36 of the tele series is engaged with the gear 36, so that the lens barrel 68 is extended. Become.

Next, when the zoom knob 106A is positioned at the wide position W,
The second tele-wide switching lever 106 rotates counterclockwise about the shaft 56A, and the gear 36 is a wide series gear 52 → 54 → 56 →.
62 → 64 mesh with each other, and the lens barrel 68 is retracted.

Next, the operation of the lens barrel 68 when the main switch is turned on → off will be described. The main switch is the zoom knob.
It is configured to interlock with 106A, and when the main switch is turned on → off, switching lever 106 and switching lever 6
0 moves to the wide side, the pin 61 is restricted by the guide groove 78B as shown in FIG. 2, and the pin 61 moves from the W end to the barrier close. As a result, the lens barrel 68 is retracted from the wide end to the retracted state. When the main switch is turned off, the switching lever 106 and the switching lever 60 move to the tele side, the pin 61 is restricted by the guide groove 78C as shown in FIG. 3, and the pin 61 is closed from the barrier to the W end. Move up to. As a result, the lens barrel 68 is pulled out from the retracted state to the wide end.

〔The invention's effect〕

As described above, according to the lens barrel driving device for a camera of the present invention, film winding and rewinding and focal length switching can be performed by one motor.

When the main switch is turned off, the gear coupling of the focal length switching mechanism is connected to the wide side, and the lens barrel is retracted and stored. Further, when the main switch is turned on, the gear coupling of the focal length switching mechanism is connected to the tele side, and the lens barrel is pulled out from the retracted state to the wide end.

[Brief description of drawings]

FIG. 1 is a perspective view showing a gear transmission mechanism of a film feeding apparatus according to the present invention, FIGS. 2 and 3 are explanatory views showing the operation of a switching lever, and FIGS. 4 to 5 are telewide switching levers. 6 is an explanatory view showing the operation, FIG. 6 is an explanatory view showing the stopper mechanism, and FIG. 7 is an enlarged view of the stopper mechanism. 10 ... Motor, 38 ... Spool, 60 ... First tele-wide switching lever, 68 ... Lens barrel, 78, 78A, 78B, 78C ... Guide groove, 86 ... Rewinding arm, 104 ... Patrone fork, 106
… Second tele-wide switching lever.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takashi Kamoda, 1-324, Uetake-cho, Omiya-shi, Saitama, Fuji Photo Optical Co., Ltd. (72) Masaji Takamura, 2-26-30 Nishiazabu, Minato-ku, Tokyo Fuji (56) References JP-A-64-38737 (JP, A) JP-A-61-43733 (JP, A) JP-A-60-100127 (JP, A) JP-A-60-97329 (JP, A) JP-A-63-257740 (JP, A) Actually developed Shou 54-76739 (JP, U) JP-B 3-59409 (JP, B2)

Claims (1)

[Claims] 1. A camera in which the electric motor is rotated forward to wind the film, and the electric motor is rotated backward to rewind the film or switch the focal length, which is connected to a focal length switching mechanism. By this, a focal length switching lever for moving the lens barrel to the tele side or the wide side by the rotational force from the electric motor is provided, and the switching lever is a guide groove formed in the lens barrel when the main switch is turned off. The lens barrel driving device for the camera is characterized in that it is held on the wide side by means of the guide groove and is held on the tele side by the guide groove when the main switch is turned on.