JP2001059989A - Fixing pedestal attachable/detachable to/from optical equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing pedestal having a stable structure so that it may be attached/detached to/from a camera, etc., without detaching a lens barrel as optical equipment. SOLUTION: As for the attachable/detachable fixing pedestal which is integrally fixed to the optical equipment by turning a fastening knob, the fixing pedestal is rotated integrally with the fastening knob 8, and the pedestal is provided with an eccentric pin 4 with threads formed on the outer periphery which is eccentric to the rotary shaft, an attachment part 1 coming into contact with the outer peripheral part of the optical equipment, and a fastening ring 2 with a groove 2c into which the eccentric pin 4 is inserted. And, one end part of the attachment part 1 and one end part of the fastening ring 2 are connected each other by a hinge 12, and by turning the fastening knob 8, the other end part of the part 1 and the other end part of the ring 2 are inserted toward the optical equipment by the eccentric pin 4 and the wall 2e of the groove by taking the hinge 2 as a center and then, fixed to the optical equipment, and a rack-like projected-recessed shape 11a engaged with the threads 4e formed on the outer periphery of the eccentric pin 4 is formed in the wall of the groove 2c coming into contact with the eccentric pin 4, then, the pedestal is fastened by turning the fastening knob 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detachable fixing pedestal (tripod pedestal) for attaching and holding an optical device such as a lens barrel to a tripod or the like.

[0002]

2. Description of the Related Art A conventional lens barrel holding device for mounting a lens barrel of an interchangeable lens as an optical device on a tripod seat has the following configuration.

(A) A fixing base for a lens barrel which has a ring-shaped lens barrel mounting portion that is completed around the entire circumference, and is fixed directly with screws screwed in the optical axis direction or via a buffer member.

(B) A ring-shaped lens barrel mounting portion is divided into two parts, a buffer member is provided on the inner periphery, one end is connected with a hinge or the like, and the other end is integrated with a tightening knob. With the rotation of the eccentric pin, there is a pedestal or the like for fixing the lens barrel in which the lens barrel holding portion is clamped with the lens barrel held around the hinge and fixed to the lens barrel.

[0005] Also, as disclosed in Japanese Patent Application Laid-Open No. 5-249357, the applicant has provided a slit in a ring-shaped holding portion (attaching portion) of an optical device, and narrowed the gap of the slit with a screw or the like. Has proposed a fixing pedestal for fixing an optical device.

[0006]

However, in the above conventional example, the fixing pedestal of item (A) first has the following drawbacks (a) to (d). .

(A) Since the lens barrel is tightened at one point, a large load is applied to a part of the lens barrel, and the lens barrel, which is an optical device, is easily deformed. The side needs to be strengthened.

(B) When the lens barrel is fixed, the load is applied in the direction of the line connecting the screw portion and the phase angle opposite to that of the screw portion by 180 degrees, so that play is likely to occur at right angles to the direction.

(C) If the mounting screws for fixing the ring-shaped mounting portion are not sufficiently tightened, the lens barrel tilts back and forth.

(D) Since the lens barrel is provided with a ring-shaped barrel mounting portion, when the mounting portion is removed from the lens barrel, the lens barrel must be removed from another device (camera body or the like) before fixing. I can't remove the pedestal. There were problems such as.

Next, in the case of item (B), since the ring-shaped mounting portion of item (A) is divided into two parts, the concentration of load and the like can be relieved considerably, but the following disadvantages still remain. ing. (E) The rotation of the tightening knob may return due to variations in the outer diameter of the lens barrel, and the fixing may be loosened.

(F) Even if the buffer member is tightened to the maximum due to aging or the like, the lens barrel may not be fixed firmly. There are the problems shown in (e) and (f).

Further, in the proposal of Japanese Patent Application Laid-Open No. 5-249357, the mechanical insufficiency such as the concentration of the load can be eliminated by improving the mechanism such as the slew mechanism and the bayonet mechanism. In such a case, there is still a problem as shown in (d) that the lens barrel cannot be removed without removing the lens barrel.

Therefore, according to the present invention, the fixing pedestal can be easily removed without removing the optical equipment.
It is an object of the present invention to provide a fixing pedestal that can be attached to and detached from an optical device that can eliminate the insufficiency in operation due to the mechanism described above.

[0015]

According to a first aspect of the present invention, there is provided a detachable structure which can be integrally fixed to an optical device by rotating a tightening knob. In the fixing pedestal, the fixing pedestal rotates integrally with the tightening knob and has an eccentric pin provided with an eccentric portion having a screw formed on the outer periphery eccentric with the rotation shaft, and a mounting portion in contact with the outer peripheral portion of the optical device. And a fastening ring provided with a groove for the eccentric pin to enter, wherein the mounting portion and the fastening ring are connected by a hinge at one end, and the other end is turned by the fastening knob. As a result, the eccentric pin and the wall of the groove are fixed to the optical device by being sandwiched around the hinge with the hinge at the center, and the wall of the groove abutting on the eccentric pin is formed on the outer periphery of the eccentric pin. The rack-like irregularities meshing with screws that are formed on the optical apparatus characterized by a fixed pedestal removable.

According to this configuration, the wall of the groove into which the eccentric pin on the side of the tightening ring enters is formed with a rack-like uneven shape that meshes with the screw formed on the outer periphery of the eccentric pin. Therefore, the contact area between the eccentric pin and the tightening ring increases, and the eccentric pin and the tightening knob are not easily loosened, so that the eccentric pin and the fastening ring can be securely fixed to the optical device. Further, since the mounting portion and the fastening ring are divided and connected by a hinge, the fixing base can be removed without removing the optical device.

Another structure for realizing the object of the invention according to the present invention is a detachable fixing base that can be integrally fixed to an optical device by rotating a tightening knob. The fixing pedestal rotates integrally with the tightening knob and meshes with an eccentric pin provided with an eccentric portion having an eccentric portion formed with a screw on the outer periphery eccentric with the rotating shaft, and a screw formed on the outer periphery of the eccentric pin. A meshing piece having a rack-shaped uneven shape formed on the surface, a mounting portion in contact with the outer peripheral portion of the optical device, and a tightening ring provided with a groove portion into which the eccentric pin enters and the meshing piece is fixed, The engagement piece is integrally fixed with a fastening ring in the groove, and the mounting portion and the fastening ring are hingedly connected at one end;
The other end is fixed to the optical device by being pinched on the optical device side around the hinge by the eccentric pin and the engaging piece by rotating the tightening knob, and is detachable from the optical device. On the fixing pedestal.

According to this structure, the workability of machining can be improved by using a separate engaging member for engaging the screw of the eccentric pin and fastening the fastening ring.

A specific configuration for realizing the object of the invention according to the present application is that, as set forth in claim 3, a buffer member is provided on the inner peripheral surfaces of the mounting portion and the tightening ring. A fixing base detachable from the optical device according to claim 1 or 2.

According to this configuration, when the fixing pedestal is mounted on the optical device, the optical device is not damaged and the backlash can be suppressed.

According to another specific structure for realizing the object of the invention according to the present application, the screw formed on the eccentric pin is a normal screw. A fixing base detachable from the optical device according to any one of claims 1 to 3.

According to this configuration, the engaging frictional force can be increased at the time of tightening, and the pedestal can be securely fixed to the optical device.

According to another specific configuration for realizing the object of the invention according to the present application, the screw formed on the eccentric pin is a reverse screw, as described in claim 5. Item 4 is a fixing pedestal detachable from the optical device according to any one of Items 1 to 3.

[0024] According to this configuration, the meshing frictional force can be increased at the time of tightening, and even if the buffer member formed on the inner peripheral surface is crushed due to aging or the like, it is also displaced inward to reduce the influence. can do.

According to another specific configuration for realizing the object of the invention according to the present application, as described in claim 6, the engagement of the screw portion formed on the eccentric portion of the eccentric pin is performed by using the tightening knob. 6. The fixing pedestal according to claim 1, wherein said engaging pedestal is formed so that the amount of engagement increases as the member rotates in the fastening direction.

According to this configuration, the amount of engagement increases with tightening, the friction increases, and the tightening knob hardly reverses. In addition, attachment to optical equipment becomes easy.

[0027] In another specific configuration for realizing the object of the invention according to the present application, the engagement amount is increased by forming the depth of the thread to increase. 7. The fixing base according to claim 6, wherein the fixing base is detachable from the optical device.

According to this structure, the screw thread of the eccentric pin becomes deeper with the rotation of the tightening knob, so that the engagement amount increases and the frictional force can be increased.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is an exploded perspective view of a fixing base detachable from an optical apparatus according to the first embodiment of the present invention. FIG. 2 is a front view of the fixing pedestal shown in FIG. FIG. 3 is a sectional view of the eccentric pin as viewed from the direction of arrow A in FIG.

In FIG. 1, reference numeral 1 denotes a mounting portion of a fixing pedestal. One end of the mounting portion 1 is provided with holes 1a, 2a through which a spring pin 12 is fixed so as to be rotatable with a tightening ring 2. Are provided respectively.
The diameters of the holes 1a and 2a are slightly different from each other, and the spring pin 12 is a shaft integrated with either the hole 1a or 2a. Hinged to 1
It is held rotatably.

The mounting member 1 has a cushioning member 15 attached to a portion in contact with the optical device. Reference numeral 1b denotes a concave portion into which the distal end portion 2b in which the width of the tightening ring 2 is reduced by one step is inserted. A buffer member 14 is attached to the inner peripheral surface of the tightening ring 2 in the same manner as the mounting portion 1 to prevent the optical device to which the fixing base is mounted together with the buffer member 15 from being damaged or deformed. In addition, rattling with optical devices is also eliminated.

Reference numeral 3 denotes a screw base formed with fixing screws for fixing the fixing pedestal to a tripod or the like from below. The screw base 3 enters the stepped portion 1c and the hole 1d of the mounting portion 1 and has two screws. Fixed at 13. Therefore, even if a downward force is applied when fixing to a tripod or the like, the stepped portion 1c allows the screw base 3 to be fixed.
Has a configuration that does not fall downward.

Reference numeral 4 denotes an eccentric pin, and a tip 4a is provided with a portion 4a which is cut in two directions, and this 4a is inserted into a hole (not shown) having the same shape as 4a formed on the tightening knob 8. As a result, it is possible to rotate integrally with the tightening knob 8. Further, the mounting screw 9 is fastened to the screw hole 4i, so that the mounting screw 9 is integrated in the direction of the arrow (A and B directions) in FIG. 4b is a step part with which the spring 6 contacts. As shown in FIG. 3, reference numeral 4c denotes an eccentric portion which is eccentric to the axis of the pin 4 by a distance a, and a screw 4e is formed on the outer periphery. The screw 4e is formed further eccentric with the axis of the eccentric portion 4c of the eccentric pin 4. Therefore, the screw thread is formed so that the screw thread depth increases in accordance with the rotation (half rotation) of the fastening knob 8.
The tip of the eccentric portion is substantially a hemispherical portion 4d. A spring pin 5 enters a hole (not shown) formed in the eccentric pin 4 and rotates integrally with the eccentric pin 4. Reference numeral 6 denotes a compression spring, which is located between the step 4b of the eccentric pin 4 and the inner step 7d of the spring case 7, and constantly urges the tightening knob 8 and the eccentric pin 4 in the direction of arrow B in FIG.

The position of the spring case 7 is determined by contacting the outer diameter stepped portion 7c with the tip 1f of the cylindrical portion 1g formed on the mounting portion 1. The countersunk screw 16 penetrates the hole 1e provided in the cylindrical portion 1g, enters the screw hole 7a of the spring case, is fastened, and integrates the spring case 7 and the mounting portion 1.

Also, when the eccentric portion 4c of the eccentric pin 4 engages and the tightening knob 8 (also the eccentric pin 4) rotates at a position farthest from the engagement piece 11, the tightening knob is pulled in the direction A, and the eccentric pin 4 tightens. A notch 7 e for guiding the spring pin 5 is provided in the spring case 7 so as to be separated from the groove 2 c of the ring 2.

A wall 7b for regulating the rotation of the tightening knob is also provided.
Is regulated to regulate rotation. Here, the wall 7b is provided in a direction substantially perpendicular to the eccentric direction of the eccentric pin 4, and the tightening knob 8 is regulated to rotate by 180 degrees. Reference numeral 10 denotes a rag hiding plate, which is attached to the fastening knob 8 so that the screw or adhesive or the like is not visible, and is fixed by bonding after the screw 9 is tightened.

Reference numeral 11 denotes a meshing top, which is provided at a contact portion of the eccentric pin 4 with a screw portion 4 provided on the outer periphery of the eccentric portion of the eccentric pin 4.
A rack-shaped uneven portion 11a is formed so as to mesh with e. The engaging piece is provided with a stepped portion 11b and a press-fit portion 11c. The press-fit portion 11c enters the width of the groove 2c of the tightening ring 2 in the direction of the axis X and is fixed to the tightening ring 2 by press fitting. The position of the engaging piece 11 and the tightening ring 2 is determined by the contact of the step 11b of the engaging piece 11 with the step 2d in the groove 2c.

FIG. 5 is a view showing a state in which the fixing base shown in FIG. 2 is mounted on a lens barrel. The figure shows a state in which the above-described mounting portion 1 of the fixing pedestal is mounted on an interchangeable lens barrel 100 for a single-lens reflex camera, which is an optical device. By attaching the fixing pedestal to the optical device in this manner, the optical device can be attached to a fixing member such as a tripod and used while holding the lens barrel.

Next, the operation of the method for mounting the fixing pedestal to the lens barrel will be described. First, the tightening knob 8 is moved at the position where the eccentric part 4c of the eccentric pin 4
Pull in the direction A of FIG. At this time, the spring pin 5 moves along the cutout portion 7e of the spring case 7, thereby retracting the eccentric portion 4c of the eccentric pin 4 from the groove 2c of the tightening ring 2 and rotating the tightening ring 2 about the spring pin 12 as an axis. Let it. In this case, the spring 6 always urges the eccentric pin in the direction B (at the same time as the tightening knob) by the step 4b of the eccentric pin and the inner step 7d of the spring case 7.

Subsequently, after aligning the inner peripheral surface of the mounting portion 1 with the mounting position of the fixing pedestal of the lens barrel, the tightening ring 2 is rotated toward the tightening knob. At this time, the slope 2 e outside the tip 2 b of the fastening ring 2 and the spherical portion 4 d of the eccentric pin 4 hit. However, when the tightening ring 2 is rotated to the tightening side (direction C), the eccentric pin 4 is once against the urging force in the direction A by the spring 6 in the direction of arrow A due to the inclined surface 2e and the spherical surface 4d. After that, the eccentric portion 4c enters the groove portion 2c by its spring force. In this state, the fixing pedestal is in the mounted state, and it does not come off from the lens barrel unless the tightening knob 8 is pulled in the direction A, thereby preventing the lens barrel from dropping carelessly or the fixing pedestal from falling. I have.

Since the screw 4e on the outer periphery of the eccentric portion 4c is further eccentric from the eccentric portion 4c, it is difficult for the screw 4e to be caught on the engaging piece 11 at this position (a position where the tightening knob 8 can be pulled up in the direction A). I have.

Next, in order to ensure the fixation to the lens barrel,
Turn the tightening knob 8 clockwise. As a result, the eccentric portion 4c of the eccentric pin 4 comes into contact with the meshing piece 11 with the eccentricity a while being in contact with the meshing piece 11, so that the eccentric amount is tightened in the direction C while the eccentricity changes. Also, at this time, the contact area increases as the tightening knob 8 is rotated by the rack-shaped uneven portion 11a of the contact surface of the meshing piece 11 and the screw 4e of the eccentric portion 4c, and the screw is bent in the direction of arrow A by the screw pitch. It is pulled in direction C and tightened. As a result, the frictional force at the contact surface can be increased, and the looseness of the tightening knob 8 can be reduced by eliminating the backlash in the B direction between the eccentric pin 4 and the tightening ring 2 by connecting with the screw. Preventing.

As described above, in the present embodiment, a strong tightening force can be obtained without any individual difference by a light operation of the tightening knob 8, and the fixing base can be securely and safely fixed to the lens barrel.

(Second Embodiment) Next, a second embodiment of the present invention will be described.
The embodiment will be described with reference to the drawings. FIG. 4 is a front view of a fixing pedestal according to the second embodiment of the present invention. The only difference between the second embodiment shown in FIG. 4 and the first embodiment shown in FIG. 2 is the structure of the eccentric pin 44 and the engaging piece 111, and all other components are the same as those in FIG. Therefore, the same components are denoted by the same reference numerals, and redundant description will be omitted.

An eccentric pin 44 having a structure different from that of FIG.
Differs only in the shape near the tip, and the screw formed on the outer periphery of the eccentric portion 44c is a reverse screw 44c. On the other hand, the engaging piece 111 has a rack-shaped uneven portion 111a formed on the surface that comes into contact with the eccentric portion 44c so as to mesh with a reverse screw 44e formed on the outer periphery of the eccentric portion 44c.

Next, the mounting operation will be described. With the above-described reverse screw structure, when the tightening knob 8 is rotated rightward and the tightening ring 2 is tightened in the C direction, the rack-shaped uneven portion 111a of the contact surface of the meshing piece 111 is eccentric. The contact area is increased by the reverse screw 44e of the portion 44c, and, in contrast to the case of FIG.
This can increase the frictional force at the contact surface,
Further, since the screws are connected with each other, play in the B direction between the eccentric pin 44 and the tightening ring 2 is eliminated, and the tightening knob 8 is prevented from loosening. In the case of the second embodiment, by bending in the direction of arrow B and displacing to the lens barrel side, if the buffer members 14 and 15 are crushed due to aging or the like, the lens barrel is securely tightened and fixed. It prevents you from being unable to do so.

In the above, an example in which the meshing piece is used has been described. However, it is a matter of course that a rack shape may be directly formed in the groove of the tightening ring instead.

Further, the fixing pedestal of the present invention comprises
The ring and the ring 2 are connected by a hinge mechanism by a spring pin 12, so that, for example, even when the lens barrel 100 is still attached to a camera or the like, the fixing pedestal can be attached and detached on the spot.

[0049]

As described above, according to the first aspect of the present invention, since the screw is formed on the outer periphery of the eccentric pin eccentric from the rotary shaft by rotating integrally with the tightening knob, the eccentric pin enters. The eccentric pin has a clamping ring provided with a groove, and the wall that contacts the eccentric pin of the groove is formed with a rack-shaped uneven shape that meshes with the screw of the eccentric pin. When moved, the contact area between the tightening ring and the eccentric pin increases, so that the eccentric pin and the tightening knob are less likely to be loosened, and the fixing pedestal can be securely fixed to the optical device. Further, since the fastening ring is connected to the mounting portion by the hinge mechanism, the fixing pedestal can be removed without removing the optical device from the camera or the like, and there is an effect that the mobility is excellent.

According to the second aspect of the present invention, a screw is formed on the outer periphery of the eccentric pin which is eccentric from the rotary shaft by rotating integrally with the tightening knob, and is fixed to the groove of the tightening ring and meshes with the screw of the eccentric pin. When the eccentric pin is rotated integrally with the tightening knob, it has an engaging piece with a rack-shaped unevenness formed, and the contact area between the engaging piece press-fitted and fixed to the tightening ring and the eccentric pin increases. ,
The eccentric pin and the tightening knob are less likely to be loosened, and the fixing pedestal can be securely and stably mounted on the optical device. Further, by forming the rack-shaped engaging piece as a separate member, there is also an effect that processing workability is facilitated and cost can be reduced.

According to the third aspect of the present invention, since the cushioning member is provided on the mounting portion and the inner peripheral surface of the tightening ring, the optical device is not damaged when the fixing pedestal is mounted, and the backlash is suppressed. There is an effect that it can be.

Further, according to the present invention, since the screw formed on the eccentric pin is a normal screw, the screw is tightened by the rotation of the tightening knob and is simultaneously moved to the outer diameter side. To increase the frictional force of the
This has the effect that it can be securely fixed to the optical device.

According to the fifth aspect of the present invention, since the screw formed on the eccentric pin is a reverse screw, the screw is tightened by the rotation of the tightening knob and, at the same time, moves to the optical device side. In some cases, the frictional force that meshes with each other is increased, and even if the cushioning material on the inner peripheral surface is crushed due to aging or the like, the effect is reduced by inward displacement.

According to a sixth aspect of the present invention, there is provided the eccentric pin, wherein the threaded portion formed on the eccentric portion is engaged.
With a structure such as increasing the screw thread, it is formed so that the amount of engagement increases as the tightening knob rotates in the direction of tightening, so the contact area that engages as the tightening increases and the friction force increases, tightening There is an effect that the knob is unlikely to turn in the reverse direction, and is easily mounted when mounted on an optical device.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a fixing base detachable from an optical device according to a first embodiment of the present invention.

FIG. 2 is a front view of the fixing base shown in FIG. 1;

FIG. 3 is a top view of the eccentric pin as viewed from the direction of arrow A shown in FIG. 2;

FIG. 4 is a front view of a fixing pedestal according to a second embodiment of the present invention.

5 is a diagram showing a state where the fixing base shown in FIG. 2 is mounted on an optical device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Attachment part 2 Tightening ring 3 Fixing screw base 4,44 Eccentric pin 5,12 Spring pin 6 Spring 7 Spring case 8 Tightening knob 11,111 Meshing frame

Claims (7)

[Claims] 1. A detachable fixing pedestal that can be fixed integrally to an optical device by rotating a tightening knob, wherein the fixing pedestal rotates integrally with the tightening knob and is mounted on an outer periphery eccentric to a rotation axis. An eccentric pin provided with an eccentric portion provided with a screw, a mounting portion in contact with an outer peripheral portion of the optical device, and a tightening ring provided with a groove into which the eccentric pin enters, wherein the mounting portion and the tightening The ring is hinged at one end, and the other end is fixed to the optical device by rotating the tightening knob and being pinched by the eccentric pin and the wall of the groove toward the optical device side around the hinge. An optical device, wherein a wall of the groove that abuts the eccentric pin is formed with a rack-shaped uneven shape that meshes with a screw formed on an outer periphery of the eccentric pin. Fixing pedestal that can be attached to and detached from the. 2. A detachable fixing pedestal that can be fixed integrally to an optical device by rotating a tightening knob, wherein the fixing pedestal rotates integrally with the tightening knob and is eccentric with a rotation axis. An eccentric pin provided with an eccentric portion having a screw formed therein, an engaging piece having a rack-shaped uneven shape formed on the surface thereof for meshing with a screw formed on the outer periphery of the eccentric pin, and an outer peripheral portion of the optical device. And a fastening ring provided with a groove to which the eccentric pin enters and the meshing piece is fixed, wherein the meshing piece is fixed integrally with the fastening ring in the groove, and And the tightening ring are connected by a hinge at one end, and the other end is connected to the eccentric pin and the meshing piece by rotating the tightening knob. Ri fixing base detachable from the optical apparatus characterized in that it is fixed to the optical device by being sandwiched in an optical apparatus side around the hinge. 3. The fixing pedestal according to claim 1, wherein a buffer member is provided on an inner peripheral surface of the mounting portion and the tightening ring. 4. The fixing pedestal according to claim 1, wherein the screw formed on the eccentric pin is a normal screw. 5. The fixing pedestal according to claim 1, wherein the screw formed on the eccentric pin is a reverse screw. 6. The meshing of a threaded portion formed on an eccentric portion of the eccentric pin is formed such that the amount of meshing increases as the tightening knob is rotated in a tightening direction. A fixing base detachable from the optical device according to any one of claims 1 to 5. 7. The fixing pedestal according to claim 6, wherein the amount of engagement is increased by forming the depth of the thread to be increased.