JPS60163010A - Optical device - Google Patents

Abstract

PURPOSE:To feed out and feed in smoothly a lens barrel without applying an immoderate force to the lens barrel, a supporting bar, etc. by providing a guide roller for receiving a force in the horizontal direction when the lens barrel is moving, on an opposed position of a roller. CONSTITUTION:When an arm 21 moves together with a lens barrel 21b, the arm 21 is guided and moved in the optical axis direction by a bar holding part 21i moving along a guide bar 26. In this case, a guide roller 24 for receiving a force in the horizontal direction is provided on an opposed position of a roller 23a. In this way, an immoderate force is not applied to the lens barrel, a supporting bar, etc., and the lens barrel can be fed out and fed in smoothly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical device that moves a lens by the driving force of a motor.

A conventional optical device of this type will be explained in detail with reference to FIG. In the figure, the switching lever 1.01 is manually rotated clockwise to engage the gear 1.04 and the telewide gear 105, and the switch 07 that rotates the motor 106 in the reverse direction is turned on.

As a result, the driving force of the motor 106 is transferred from the gear train shown in the figure to the gears 108 and 104 of the switching lever 1.01. The signal is transmitted to the tele wide gear 105 via the following. Then, the rotation pin 109 in the elongated hole 108a of the arm 108 rotates in the same direction as the telewide gear 105, in the direction of the arrow in the figure, and the arm 108 moves together with the lens barrel 1.10 in the direction of the optical axis of the arrow in the figure. The roller 111 moves backward, detaches from the wide cam 108b of the arm 108 and rides on the cam portion 108c, and this state is maintained. After this, the rotation pin 109
When the roller 11.1 is located at the rearmost position, the telecam 10
8d, the switching lever 101 is rotated counterclockwise by the action of the spring 1.02, the gear 104 and the telewide gear 105 are disengaged, and the switch 1.07 is turned off and the motor 106 is turned off. The rotation is stopped and the lens barrel 110 holding the lens 110a is positioned.

In the above explanation, the lens barrel] 10 is retracted, but when extending the lens barrel] 10, the rotation pin 109 rotates from the rearmost position to the forwardmost position, and the lens barrel 10 is extended in the same manner as above. and positioning is performed.

However, in this type of device, when the lens barrel is retracted as shown in FIG. A force is applied to the telewide gear 105 to prevent it from rotating counterclockwise in the direction of the arrow in the figure, and the load on the gear 104+ that meshes with this increases, causing the gear 104 rotating counterclockwise. furthermore, the tele wide gear 105 becomes a winner.

As a result, the rotational force of the switching lever 101 in the counterclockwise direction of the arrow shown in the figure increases, and the roller 111 moves the arm 1
The side of 08 will be pushed hard.

On the contrary, even if the gear 104 is rotated counterclockwise, if the lens barrel 1.10 is pushed backward by an external force when retracting the lens barrel, the telewide gear 105 will rotate further. The gear 104 tries to rotate in the clockwise direction and tries to increase the counterclockwise rotation of the gear 104, causing the gear 104 to run away. As a result, the rotational force of the switching lever 101 in the counterclockwise direction of the arrow shown in the figure increases, and the rotation force of the switching lever 101 increases.
will forcefully push the side of arm 1.08.

Similarly, when the lens barrel 110 is extended, depending on the direction of the external force applied to the lens barrel 110, the side surface of the arm 108 is strongly pressed by the rollers 1.11. When such a strong force in a direction other than the optical axis is applied to the lens barrel portion such as the arm 108, the optical system such as the lens 110a may become decentered or fall down, causing problems.

The present invention has been made in view of the above points and in order to eliminate the above drawbacks.In an optical device in which a lens is driven by a motor and moved in the optical axis direction, a movable member that moves together with the lens comes into contact with the lens. Provided is an optical device that prevents eccentricity, falling, etc. of the lens by providing an opposing member that abuts the movable member at a position opposite to the position where the operating member of the self-holding clutch abuts the movable member. The purpose is to

Furthermore, another object of the present invention is, in addition to the above-mentioned object, to apply a small amount of force to the moving member of the operating section and the opposing member while the lens moves from just before the specified position to the specified position. It is an object of the present invention to provide an optical device provided with a contact regulating means so as to prevent the above-described effects from occurring.

EMBODIMENT OF THE INVENTION Hereinafter, an embodiment in which an optical device according to the present invention is applied to an electric variable focus device of a camera will be described with reference to the drawings.

FIG. 2 shows an embodiment in which the optical device according to the present invention is applied to a camera, and is an explanatory view of the main parts showing a state in which the lens barrel is retracted. (2) is a reversible rotary motor that winds the film, performs various charges such as rewind shutter charging, and extends and retracts the lens barrel, and is housed in a spool 10 that rotates and winds the film during winding. 2 is a pinion gear 8.8a that is press-fitted into the shaft of motor l, and 4°4a is a gear train that reduces the rotation of motor l, gears 8 and 8.
a and gears 4 and 4a are integrally coaxial, and pinion gear 2 and gear 3 mesh with gear 8a and gear 4, respectively. Reference numeral 5 denotes a spool clutch gear, which controls the rotation of gears 4 and 4a only when the motor 1 rotates in the winding direction (when the motor 1 rotates in the counterclockwise direction of the dotted arrow in the figure). Spool 1o
The signal is transmitted to the spool gear 9 attached to the spool gear 9. Reference numeral 6 denotes a winding clutch gear, which rotates with the rotation of the winding clutch 6b, and is connected to the sprocket gear 7 when the rotation direction of the motor 1 is in the winding direction; When rotating clockwise in the direction of the solid arrow shown in the figure), gear 1 meshes with idler gear 1 and transmits the rotation of gear 4a, and sprocket 8 defines the film by the rotation of sprocket gear 7. Send length.

The gear 4a, the spool clutch gear 5, and the hoisting clutch gear 6 are always in mesh with each other, and the spool clutch 5b and hoisting clutch 6b are rotatable independently, and both clutches 5b and 6b have rotational gears. A shaft is provided, and friction for switching the clutch is provided between the respective lugs f5b, 6b and both gears 5.6.

Reference numeral 18 denotes a switching lever, which is rotatably provided on the same axis as the shaft 18c of the gear 12, and a spring 16 hung between a pin LAD provided above and a pin 17 provided on the camera body.
is biased in the counterclockwise direction, and by manually rotating it clockwise against this bias,
Normally gear train 11 → 12 → connected up to fork 2Ob
One gear 15 of 15→■9→20 is separated from this gear train and meshed with the telewide gear 18, and the rotation of the motor 1 is transmitted to the telewide gear 18. Note that the switching lever 13 is approximately T-shaped except for the part of the switching member 18e that is exposed to the outside through the opening of the camera body and is provided on the switching lever 13 for manually switching the clutch consisting of the switching lever 18 and the like. Idler gear 11 in the center
A gear 12 meshing with the gear 12 is pivotally supported, a gear 15 meshing with the gear 12 is pivotally supported at one end, and a switch engaging portion]8b is located at the other end. is provided with a roller 18a. The telewide gear 18 changes its rotation to the rotation of the rotation pin], 8b via the pin support portion 18a, and the rotation pin 18b rotates the arm 2.
Push the front or rear wall of the elongated hole 21a of the arm 21.
Move it forward and backward relative to the camera, and attach the lens barrel mounting part 21 of arm 2■.
d, the lens barrel support portion 21.d of the lens barrel 21b. The lens barrel 21b to which the lens holder e is attached and holding the photographing lens 21C also moves back and forth. In addition, in front of the arm 21, there is a lens barrel cover 2 provided with plate springs 22 and 22' for positioning, which will be described later, on the side.
8 is attached to the arm 21. Switch engaging part 1
8b is the switch 1 when the switching lever ■8 is rotated clockwise until the gear 15 meshes with the telewide gear 18.
4 is turned on, and the switch 14 is turned off at times other than this meshing. Note that the switch 14 is connected to the section 14a and the section 1.
4b, and is turned on when these pieces 14a and 14b come into contact with each other to energize the motor 1 in the clockwise or reverse rotation direction.

When the motor 1 rotates in reverse, the gear train rotates, and the arm 21 begins to move forward or backward, the roller 13a is activated by a wide cam 21f provided in the shape of a notch at two corners of the arm 21.
, a telecam 21g, a shooting lens,
The cam 21 is provided in a direction parallel to the optical axis direction of the lens 21c.
h and prevent the switching lever 18 from rotating counterclockwise back due to the action of the spring 16, and also to maintain the switching lever 18 in that state so as not to impede the movement of the arm 21 in the front-rear direction. belongs to. The spring 16 is used when the lens barrel 21b is extended or retracted)
When the position is reached, the switching lever 18 is rotated counterclockwise to quickly drop the roller 13a onto the telecam 21g (or wide cam 21f). This results in
Gear 5 is disconnected from telewide gear 18, and switch 14 is turned off. Note that the gear train 11 is always in mesh except when the switching lever 13 is switched to the barrel drive side.
→ 12 → 15 → 19 → 20 transmits the reverse clockwise rotation of the motor 1, so during rewinding, this gear train rotates from the reverse rotation of the motor 2, and the fork 20b provided on the gear 20 rotates. The photographed film is wound from the spool 10 into a cartridge (not shown).

8 to 5 are top views of the lens barrel according to the present invention. FIG. 8 is a view with the photographing lens set on the telephoto shooting side, FIG. 4 is a view of the portion shown in FIG. 2, and FIG. FIG. 5 is a diagram in which the photographing lens is set on the standard photographing side.

Elements with the same symbols as those in FIG. 2 have already been explained, so their explanation will be omitted. In the figure, reference numeral 23 denotes an outer barrel fixed to the camera body (not shown), and leaf springs 22 and 22' are inserted into positions corresponding to the prescribed positions for standard photography and telephoto photography of the lens barrel 21b. Leaf spring engagement holes 28a, 28'a and 23b, 28'b are provided for positioning the cylinder 21b, respectively. Reference numerals 22 and 22' denote a plurality of leaf springs attached to the outside of the lens barrel cover 28 attached to the front end of the arm 21 and biased to spread in the radial direction of the outer barrel 23. The joint portions 22a, 22'a are approximately V-shaped, and the leaf spring engagement hole 23a of the outer cylinder 28 is formed.

When engaging with 28'a, 28b, or 2B'b, the arm 21 and the lens barrel 21b are moved and positioned from immediately before the predetermined position to the predetermined position, respectively, regardless of the rotational force of the rotation pin 18b. It is for. 24 is located near the position facing the roller 18a across the arm 21, and is a fixed pin with a smooth outer periphery or a smoothly rotating guide roller, etc., which contacts the side surface of the arm 21 and rotates the axis of the lens barrel 21b. To suppress unnecessary movement in a direction perpendicular to the direction of movement of an arm 21 without interfering with movement in the direction. Reference numeral 26 denotes a guide bar with a smooth outer periphery, which is supported at both ends by support stands 27 a and 27 b provided on the camera body, and is provided parallel to the moving direction of the arm 21 , and is a cylindrical bar fixed to the arm 21 . The holding portion 21i is fitted into this so as to be slidable in the axial direction.

25, 25' are lens barrels 21. This is a stopper for defining the position in which the arm 2 and the arm 2 are retracted, and in this position the leaf springs 22 and 22' are inserted into the leaf spring engagement hole 23.
+) and 28'b to bias and position the lens barrel 21b and arm 21 toward the stoppers 25 and 25'. End face 27c of support stand 27a and bar support part 21
By abutting against the end surface 21j of the support base 27a, the support base 27a defines the position where the lens barrel 21b and the arm 21 are smoothly extended. In addition, 29 regulates the rotation of the switching lever 13, and 8a is the wide cam 21f or the telecam 2.
When the weight drops to 1g, the roller 18a contacts the arm 21 and serves as a lever stopper to prevent unnecessary force from being applied to the arm 21, and the elongated hole 21a has a width wider than the outer diameter of the pin 18a. . Further, 30 and 80' are slopes provided at the edges of the arm 21, respectively, and the slope 30 is the slope of the roller 18.
When a falls into the wide cam 21f, the guide roller 24
The slope 80' prevents the guide roller 24 from contacting the arm 21 when the roller 18a falls into the telecam 2g, and prevents unnecessary force from being applied to the arm 21. This is for the purpose of

Next, the operation of this embodiment will be explained with reference to FIGS. 2 to 5. Although FIGS. 2 and 4 currently show the operation of the lens barrel 21b in the middle of retracting, first, the operation during normal operation when the lens barrel 21b is not operated will be explained.

Due to the bias of the spring 16, the switching lever 18 is moved to the shaft 13c.
The roller 18a is at a position rotated counterclockwise about the center of rotation, so that the roller 18a has fallen into either the telecam 21g or the wide cam 21f (the state shown in FIG. 8 or FIG. 5). At this time, the switching lever 13 is in contact with the lever stopper 29, and the roller 18a is not touching the arm 21. Further, the guide roller 24 does not touch the arm 21 due to the relief of the slope 80 or 80'.

At this time, the gear 5 does not mesh with the telewide gear 18, but meshes with the gear 19, and the switch 14 is off.

That is, when winding a film, the motor 1 rotates in the counterclockwise direction, and at this time, the spool clutch 5b and the winding clutch 6b rotate in the counterclockwise direction, and the spool clutch gear 5 meshes with the spool gear 9. Then, the winding clutch gear 6 meshes with the sprocket gear 7 and the motor 1
transmits power. Gear train 2-8- formed at this time
8a-4-4a-5-9 causes the spool 10 to wind up the film, and the gear train 2-8-3a-4-4
Sprocket 8 feeds the film through a-6-7. Therefore, at the time of film winding, the idler gear 1 and the winding clutch gear 6 do not mesh with each other, so that the power of the motor 1 is not transmitted from the idler gear 11 to the downstream gears. When rewinding the film, a switch (not shown) other than the switch 14 causes the motor l to rotate in the reverse direction (rotation in the clockwise direction), and the spool clutch 5b and winding clutch 6b to rotate clockwise, thereby causing the spool clutch gear to rotate. 5 and the spool gear 9 are disengaged, and the winding clutch gear 6 is disengaged from the sprocket gear 7.
The gear 11 is engaged with the idler gear 11. Gear train 2-8-8 a -4-4a -6- formed at this time
11-(12-051-19=20 for fork 2
0b rotates clockwise and transfers the film to the cartridge (
(not shown). Although I have not mentioned the switching of both clutches 5b and 6b, this is the gear train 2-3-8 a = 4-4 a-5 that transmits the rotational power of the motor (2).
The gears 5 and 6 and the clutches 5b and 6b are automatically switched by friction between the two clutches 5b and 6b.

Next, operations for moving the lens barrel will be explained in order (in this case, the retracting operation of the lens barrel 21b shown in FIG. 1). From the state shown in FIG. 8, when the switch member 18e of the switching lever 18 is pushed in the direction of the arrow shown in the figure against the force of the spring 16 and the switching lever 18 is rotated clockwise about the shaft 1.30, the gear 15 disengages from the gear 19 and engages the telewide gear 18, at the same time the switch engaging portion 1
8b pushes the piece 14a of the switch 14 towards the piece 14b side, and the pieces 14a and 14b come into contact with each other and the switch 14
By turning on the motor 1, the motor 1 starts rotating in the reverse clockwise direction. Therefore, as mentioned above, the gear train for normal film rewinding is set up, and the reverse rotation power of the motor 1 is transmitted to gear 12, but since the switching lever 13 is rotating clockwise, gear 5 rotation is tele wide gear 18
The rotation pin 18b rotates counterclockwise via the pin support portion 18a and pushes the rear wall of the elongated hole 21a of the arm 21 as shown in FIG. Therefore, after the lens barrel 21b begins to retreat and the roller 18a is pulled out from the telecam 21g,
The lens barrel 21b rides on the cam 21h until it reaches the lower position.
At the same time, when the arm 21 retreats, the switching lever 13, which has been removed from the external force by the hand, can no longer rotate counterclockwise, and each mechanism remains in its original state (FIG. 2 shows this state). ). Eventually, the rotation pin 18b rotates close to the rearmost position, and when the lens barrel 21b and arm 21 reach a position slightly before the specified retracted position, the leaf spring 2
The engagement portions 22a and 22'a of J2 and 22' are biased to engage the leaf spring engagement holes 28b and 23 of the outer cylinder 23, respectively.
'b, and the lens barrel 21b and the arm 21 no longer rely on the rotational force of the rotation pin 18b, but the arm 21 is moved to the stopper by the biasing force of these plate springs 22 and 22' during engagement. 25.2! It is pulled in to the specified retracted position regulated by 'r, and is biased and held. At that time, the roller 18a falls into the wide cam 21f and moves the switching lever 1 until it hits the lever stopper 29.
8 is rotated counterclockwise by the action of the spring 16, the gear 15 is separated from the telewide gear 18, and the switch 14 is turned off to stop the rotation of the motor 1, resulting in the state shown in FIG. Also, at this time, the guide roller 24 is located at a position facing the slope 80' of the arm 21, so that it is separated from the side surface of the arm 21.

In addition, when the arm 21 moves together with the lens barrel 21b, the arm 21 moves along the guide bar 26.
1i in the optical axis direction. Furthermore, when they are moving and the engagement action of the leaf springs 22 and 22' is not applied, the guide roller is placed on the side of the arm 21 opposite to the position where the roller 18a is in contact with the cam 2111 of the arm 2. 24 are in contact with each other, and the arm 21 is held between the roller 13a and the guide roller 24. As a result, as described above, when an external force is applied to the lens barrel 21b, the roller 13a strongly contacts the cam 21h of the arm 21 due to the direction of the external force, and there is no fear that the optical system such as the photographic lens 21c may be eccentric or fall. However, since the guide roller 24 absorbs this force, there is no need to worry about this.

The above operation has been described for moving the lens barrel 21b from the extended position (telephotography position) to the retracted position (standard photography position).Next, the reverse operation will be briefly described.

In the state shown in FIG. 5 described above, rotate the switching lever 13 clockwise to pull out the roller 13a from the wide cam 21f, and at the same time change the gear 15 to the tele wide gear ■8.
and turn on the switch 14. As a result, the power of the reverse clockwise rotation of the motor 1 is transmitted to the rotating pin 18b via the aforementioned gear train, and the rotating pin 18b pushes the front wall of the elongated hole 21a, thereby causing the arm 2 21b, and the roller 18a is pulled out from the wide cam 21f and moved to the cam 21. Climb onto h.

As a result, the switching lever 1 is free from external force caused by the hand.
B cannot be rotated in the most counterclockwise direction, and each mechanism remains in the N state.

Eventually, the rotation pin 18b rotates from the rearmost position to near the frontmost position, and when the lens barrel 21b and the arm 21 reach a position slightly in front of the specified extended position, at this time, the leaf spring 2
The engagement portions 22a and 22'a of 2 and 22' engage the leaf spring engagement hole 23a of the outer cylinder 28 due to their urging force.
, 2B'a, and the lens barrel 21b and arm 21 no longer rely on the rotational force of the rotation pin 18b, but instead are pushed against the end surface of the bar support portion 21i by the force of engagement of these leaf springs 22 and 22'. 21j is extended to the specified extended position of the lens barrel 21b, where it abuts against the end surface 27c of the support base 27a, and is held there.

At that time, the switching lever 18 comes into contact with the lever stopper 29, and the roller 18a falls into the telecam 21g so that the switching lever 18a does not touch the arm 21.
is rotated clockwise to disconnect the gear 15 from the telewide gear 18, and the switch 14 is turned off to stop the rotation of the motor 1, resulting in the state shown in FIG. 3. Here, the front end of the bar holding portion 21i abuts against the support base 27a by the above-mentioned operation of the arm 21 by the leaf springs 22°'2, 2', thereby positioning the lens barrel portion. Note that at this time, the guide roller 24 also no longer comes into contact with the arm 21 due to the slope 80.

Note that it is preferable that the edge connecting the rotation centers of the roller 18a and the idle roller 24 be perpendicular to the optical axis or the moving direction of the lens barrel 21b.

Further, the number of parts may be reduced by using the same parts for the guide roller 24 and the roller 18a. In addition, if the notch into which the roller 18a escapes and the notch into which the guide roller 24 escapes are made to have the same shape and the same position, they will contact the lens barrel at the same time and leave at the same time, so that the lens barrel will always be in contact with the optical axis. There is no unnecessary lateral force.

As explained above, in the electric variable pointless mechanism such as the configuration of the embodiment that is the basis of the present invention, when the load of moving the lens barrel increases, the roller provided in the clutch moves the lens barrel part. Although the pressing force is large (although the present invention provides an idle roller at a position opposite to the roller to receive the lateral force while the lens barrel is moving, when the lens barrel reaches the shooting position, these members are By separating the lens barrel from the lens barrel section, the lens barrel can be smoothly extended and retracted without applying excessive force to the lens barrel, support bar, etc., and has the effect of preventing eccentricity and tipping of the lens.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional example, and FIG. 2 is a part of an electric variable focus device of a camera according to the present invention. Embodiment 1 shows a motor, 1
8 is a lever, and 18a is a roller. 18b is a switch engaging portion, 14 is a switch, 12゜15
．． 19 is a gear, 16 is a spring, 18 is a telewide gear, 18b is a rotation pin, and 21 is an arm. 21a is a long hole; 21. b is a lens barrel; + 21 c is a photographic lens, 21d is a lens barrel mounting portion, and 21e is a lens barrel support portion. 21f is a telecam, 21g is a wide cam, 21h is a cam, 22.22' is a leaf spring, 22a, 22'a are spring engaging parts, 2J3 is an outer cylinder + 28a + 28'a + 28
b28'b is a leaf spring engagement hole, and 80,3Cj' is a slope.

Claims (7)

[Claims] (1) The lens barrel is driven by switching gears using a clutch, and the lens barrel is moved by holding a self-holding operating member provided on the clutch with a movable member that moves in the optical axis direction together with the lens barrel. In the optical device for self-holding the clutch, at least the operating member is provided so as to abut at a position of the movable member opposite to a contact position of the movable member while abutting the movable member. An optical device characterized by comprising an opposing member. (2) The optical device according to claim 1, wherein at least one of the operating member and the opposing member is a roller. (3) The optical device according to claim 2, wherein both the operating member and the opposing member are rollers having the same diameter. (4) A patent claim comprising contact regulating means for preventing at least one of the operating member and the opposing member from contacting the movable member at least from just before the specified position of the lens barrel to the specified position. The optical device according to any one of the ranges 1 to 8. (5) The optical device according to claim 4, wherein the contact regulating means is a notch provided in the moving member. (6) The optical device according to claim 4, wherein the contact regulating means comprises a notch provided in the movable member and a movement regulating means for regulating the movement of the clutch. (7) The optical device according to claim 5 or 6, wherein the shape of the notch for the operating member and for the opposing member are the same.