JPH07239434A - Optical device with tilt and shift interlocking mechanism - Google Patents

Abstract

PURPOSE:To reduce the load of a tilt and shift interlocking action, to improve the efficiency of a tilt and shift interlocking mechanism and to make followup ability excellent in an optical device with the tilt and shift interlocking mechanism. CONSTITUTION:This crevice is provided with a lens barrel 1 having an optical system, a cam follower for shift 13 and a cam follower for tilt 14 provided on both sides of the barrel 1, a coupling member 3 provided with a cam for shift 3c and a cam for tilt 3d engaged with the followers 13 and 14, a holding lens barrel 7 holding the barrel 1 through the coupling member 3 and moving mechanism parts 4 and 5 interlocking a tilt and a shift mechanisms through the followers 13 and 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical device having a tilt / shift interlocking mechanism in an optical lens.

[0002]

2. Description of the Related Art Although many tilt and shift mechanisms for conventional optical lenses have been proposed by various companies,
They are composed of independent movements of the tilt mechanism and the shift mechanism. Further, Japanese Patent Application Nos. 5-035514 and 4-087218 have been proposed as those in which the tilt mechanism and the shift mechanism are linked.

[0003]

However, in the above-mentioned conventional example, the tilt mechanism uses the cam lift, the shift mechanism adopts a shift method other than the cam, and the tilt mechanism and the shift mechanism are interlocked. There was a restriction on the vehicle and the load increased during driving, and the followability of the interlocking of the tilt mechanism and the shift mechanism was poor. Also, when driving the interlocking tilt mechanism and shift mechanism with an electric motor,
Due to the structure, the driving efficiency is poor, the number of parts is large, the shape of parts is complicated, and the cost is increased.

An object of the present invention is to obtain an optical device having a tilt / shift interlocking mechanism that solves the above problems.

[0005]

According to a first aspect of the present invention, there is provided a lens barrel having an optical system, a shift cam follower and a tilt cam follower provided on both sides of the lens barrel, and the shift cam follower. A shift cam that engages with the tilt cam follower and a connecting member provided with a tilt cam, a holding barrel that holds the lens barrel through the connecting member, the shift cam follower and the tilt cam follower Through tilt
The invention according to claims 2 to 4 is devised with the above-mentioned connecting member, and the load of tilt / shift interlocking is reduced, and the efficiency of the tilt / shift interlocking mechanism is improved. And the followability becomes good.

According to the fifth aspect of the present invention, the moving mechanism section includes a gear cam plate provided with a cam and a gear parallel to the optical axis that engages with the shift cam follower, and a shift motor that interlocks with the gear. A compact tilt and
The shift mechanism is linked, making it easy to electrify.
In addition, the shape of parts is simplified, the number of constituent parts can be reduced, and total cost reduction such as parts processing and assembly is realized.

[0007]

【Example】

Example 1. Embodiments of the present invention will be described below with reference to the drawings. 1 is an external view showing an optical device in which a tilt mechanism and a shift mechanism are interlocked, FIG. 2 is a front view of FIG. 1 seen from the projection side, and FIG. 3 is an exploded perspective view showing an interlocking portion of the tilt mechanism and the shift mechanism. is there.

1 to 3, 1 is a lens barrel having an optical system, 2a and 2b are fixing plates which are arranged on both left and right sides of the lens barrel 1 and are screwed together, and 6 is the lens barrel 1. Is a joint cylinder screwed to the end of the fixing plate 2a, 2b and joint pipe 6, or the lens barrel 1 and the fixing plates 2a, 2b and joint pipe 6.
May be monolithic.

Reference numerals 3a and 3b are cam plates as interlocking members. The cam plates 3a and 3b have a shift cam 3c on the same plane as the optical axis and a tilt cam 3d outside the optical axis, and the shift cam. Straight guides 11a, 1 parallel to 3c
1b is attached. Reference numeral 7 denotes a fixed barrel as a holding barrel for positioning the cam plates 3a and 3b and connecting them with screws.

The lens barrel 1 and the fixed barrel 7 are engaged with a shift cam 3c of the cam plates 3a and 3b, a shift roller 13 and a tilt roller 14 as cam followers provided on the fixed plates 2a and 2b on the tilt cam 3d. In particular, by fitting them together, they are connected and held on both sides. A backlash removing roller 17 is interposed between the fixed plates 2a and 2b and the cam plates 3a and 3b. The backlash removing roller 17 removes left and right backlash and smoothes the sliding.

Reference numeral 4 denotes a gear cam plate, and this gear cam plate 4
Is a rack 4a meshing with the output gear 5a of the shift motor 5, a lateral cam 4b parallel to the optical axis, and the straight guide 11
Straight-moving grooves 22a and 22b that fit with a and 11b are provided. Reference numeral 15 denotes the straight guides 11a and 11b and the cam plate 3a.
The gear cam plate 4 slides along the guide shaft 15 as a guide shaft to be coupled to the. A leaf switch 20a is screw-connected to the straight guide 11a, and the shift amount is defined by the stopper pieces 12a and 12b connected to the gear cam plate 4.

The fixed barrel 7 is a large gear 7 for revolving.
It has a, meshes with the output gear 19a of the revolving motor 19, and its rotation direction is regulated by the leaf switch 20b and the stopper pin 18 provided on the body mount 8. Then, the fixed barrel 7 and the body mount 8,
The steel ball 16 is sandwiched by a holding ring 9, and sliding rollers 21 are engaged with the inner diameters of the fixed cylinder 7 and the main body mount 8 at several places to reduce the rotational load.

It should be noted that the rack 4a of the gear cam plate 4 and the shift motor 5 which interlocks via the output gear 5a, and the large gear 7a of the fixed barrel 7 and the revolving motor 19 which interlocks via the output gear 19a form a moving mechanism section. I am configuring.

Next, the operation of the tilt / shift interlocking mechanism of the first embodiment having the above-mentioned structure will be described.

When the power source of the shift motor 5 is turned on, the driving force is transmitted from the output gear 5a of the shift motor 5 to the rack 4a of the gear cam plate 4, and the gear cam plate 4 operates vertically in the figure. Therefore, the driving force is transmitted from the lateral cam 4b of the gear cam plate 4 to the shift roller 13. Then, the tilt amount corresponding to the shift amount, which is the shift cam 3c and the tilt cam 3d of the gear cam plate 4, is transmitted to the lens barrel 1 integrated with the fixed plates 2a and 2b via the shift roller 13 and the tilt roller 14. Tilt operation is performed in conjunction.

A straight groove 22 when the tilt / shift is interlocked
The linear guides 11a and 11b fitted in the a and 22b slide, and smooth operation transmission is performed. At this time, the leaf switches 20a connected to the linear guide 11a come into contact with the stopper pieces 12a and 12b connected to the gear plate 4, the power of the shift motor 5 is turned off, and the shift amount is determined.

Next, the operation of the revolving motor 19 will be described. When the power of the revolving motor 19 is turned on, the driving force is transmitted from the output gear 19a of the revolving motor 19 to the large gear 7a on the outer circumference of the fixed barrel 9, and the fixed plate 2 and the joint plate with which the lens barrel 1 is integrated. It rotates together with the cylinder 6. At this time, the leaf switch 20b acts on the stopper pin 18 connected to the fixed barrel 7 to turn off the power and determine the rotation angle.

Example 2. FIG. 4 shows the cam plate 3 in which both the shift cam 3c and the tilt cam 3d are arranged outside the optical axis, and FIG. 5 shows the shift cam 3c on the optical axis opposite to the first embodiment, and the tilt cam 3d. The cam plates 3 provided later are shown. Even if these cam plates 3 are used, the same effects as those described in the first embodiment can be obtained.

Example 3. In the cam plates 3a and 3b arranged on both sides of the lens barrel 1, when the shift cam 3c and the tilt cam 3d are provided only on one side of the cam plates 3a and 3b, the cam plates on the opposite side can cope with the movement amount. A guide (not shown) is provided.

[0020]

As described above, according to the first aspect of the invention, the shift cam followers and the tilt cam followers provided on both sides of the lens barrel having the optical system, and the shift cam followers and the tilt followers. Holding lens barrel that holds the lens barrel by fixing a shift cam that engages with the cam follower and a connecting member provided with a tilt cam, and a tilt via the shift cam follower and the tilt cam follower. A shift mechanism that interlocks shifts is provided, and the invention according to claims 2 to 4 is a device in which the above-mentioned connecting member is devised. The load of tilt / shift interlocking is reduced, and the efficiency of the tilt / shift interlocking mechanism is improved. And the followability becomes good.

According to the invention of claim 5, a lateral cam parallel to the optical axis for engaging the shift cam follower and a gear cam plate provided with a gear, a shift motor interlocking with the gear, and the holding member. Since the moving mechanism is composed of the revolving motor that works in conjunction with the gear of the lens barrel, a compact tilt / shift mechanism works in tandem, and electrification is easy. Further, the parts shape is simplified, the number of constituent parts can be reduced, and effects such as total cost reduction of parts processing and assembling can be obtained.

[Brief description of drawings]

FIG. 1 is an external view of an optical device showing a first embodiment of the present invention.

FIG. 2 is a side view of FIG. 1 seen from the projection side.

FIG. 3 is an exploded perspective view showing a main part of a tilt / shift interlocking mechanism.

FIG. 4 is a front view of a cam plate used in Embodiment 2 of the present invention.

FIG. 5 is a front view of another cam plate used in Embodiment 2 of the present invention.

[Explanation of symbols]

 1 Lens barrel 3 Cam plate (connecting member) 3c Shift cam 3d Tilt cam 4 Gear cam plate (moving mechanism part) 5 Shift motor (moving mechanism part) 7 Fixed barrel (holding barrel) 8 Main body mount 11a, 11b Straight advance Guide 13 Shift roller 14 Tilt roller 19 Revolving motor (moving mechanism)

Claims (5)

[Claims] 1. A lens barrel having an optical system, a shift cam follower and a tilt cam follower provided on both sides of the lens barrel, and a shift cam follower and a tilt cam follower engaging with the shift cam follower. A connecting member provided with a cam and a tilting cam, a holding barrel for holding the lens barrel via the connecting member, and a movement for interlocking tilt / shift via the shift cam follower and the tilt cam follower. An optical device having a tilt-shift interlocking mechanism, characterized by comprising a mechanical section. 2. The shifting cam and the tilting cam are arranged such that one of them is located on the same plane as the optical axis and the other is located outside the optical axis, or both of them are located outside the optical axis. An optical device having a tilt / shift interlocking mechanism according to item 1. 3. An optical device having a tilt / shift interlocking mechanism according to claim 1, wherein the position of the shift cam on the optical axis is provided before or after the tilt cam in the optical axis direction. . 4. When the connecting members arranged on both sides of the lens barrel have shift cams and tilt cams on only one connecting member, guides on the opposite connecting member can accommodate a movement amount. An optical device having a tilt / shift interlocking mechanism according to claim 1, wherein the optical device is provided. 5. A gear cam plate provided with a cam and a gear parallel to an optical axis that engages the shift cam follower, the shift mechanism section, and a shift motor that interlocks with the gear.
An optical device having a tilt / shift interlocking mechanism according to claim 1, 2, 3, or 4, comprising a motor that interlocks with a gear of the holding barrel.