JPS63214732A - Electrical equipment incorporated lens - Google Patents

Abstract

PURPOSE:To mount electrical equipment in a gap part to high density by providing a guide part for incorporating and holding a sheet body for the electrical equipment at a specific position in the gap part, and also fitting a support member to a movable external constitution member. CONSTITUTION:A lens barrel has the considerably large gap part 11 among the inner peripheral surface of a zoom ring 3 which forms its outer constitution member, the outer periphery of a lens holding frame 7, and the outer periphery of the movement passage for the member across a cylinder body 1c. This gap part 11 is utilized to provide the electrical equipment in the gap part 11 by using the support member 14. Part of the external surface of the support member 14 corresponding to the gap part 11 serves as an electrical equipment support surface for mounting and holding the electrical equipment and the guide part 15 for arranging the electrical equipment at the specific position, and this guide part 15 supports the sheet body for the electrical equipment such as a flexible board where an electric circuit is formed, electric parts and an actuator; and the sheet body is inserted into the gap part 11 from behind the cylinder body 1c and a flange 14c is fitted to a projection piece 3a with a screw 17, so that the support member 14 is united with the zoom ring 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lens with a built-in electrical component, and more particularly to a lens with a built-in electrical component in which an electrical component is mounted within a lens barrel.

[Prior Art] In recent years, electronic cameras, video cameras, etc. have become increasingly automated and electronic, and have therefore been equipped with a number of components in their lens barrels for autofocus driving, zooming driving, aperture driving, shutter driving, etc. Actuators are increasingly being installed.

In this case, considering the miniaturization of the camera body, the simplification of the electrical connection between the body and lens, the total space efficiency of the body and lens, etc., the electric circuit such as ROM for driving the actuator and controlling the lens barrel is Therefore, it is necessary to obtain space to mount electrical components within the lens. However, in order to obtain space for mounting electrical components and circuits within the lens, the lens optical path must naturally be avoided, and due to the mounting space, the lens mirror is usually cylindrical. It is also unfavorable in terms of appearance and operability to have a portion of the cylinder protrude outward.

In addition, as a conventional model of this kind, the Utility Model 61-2117
A circuit mounting structure for an electronic camera is disclosed in Publication No. 6. However, this technical means has a lens with a small diameter such as a relay lens arranged inside, and a flexible electric circuit on the outer periphery of the lens fixing frame, which is attached to the camera body at the outer periphery. Although it uses the dead space inside the body by wrapping a circuit board around it, it does not place any electrical components or circuits inside the lens barrel.

[Problems to be Solved by the Invention] Therefore, in order to find mounting space within the lens barrel without increasing the outer diameter of the lens barrel, it is necessary to It becomes a ring-shaped part that exists on the side. This part is used when a lens moves in the optical axis direction within the lens barrel, such as a zoom lens.
A fairly large dead space exists around the outer periphery of the variable power lens, where no light rays pass through. Therefore, it is conceivable to use this dead space as a mounting space.

However, in order to efficiently mount electrical components and electrical circuits in this gap at a high density, it is necessary to devise a means for holding the electrical components.

SUMMARY OF THE INVENTION An object of the present invention is to provide a lens with a built-in electrical component that allows electrical components to be efficiently mounted in a high-density space within a lens barrel that has a movable outer shell component on the outer periphery of the lens barrel.

[Means and effects for solving the problems] In order to achieve the above object, the present invention provides a lens barrel having a movable lens. and a guide section for incorporating and holding the electrical component sheet-like body in a predetermined position within the void, the sheet-shaped body for electrical components being disposed in a gap between the outer periphery of the lens and the movable lens. and a support member attached to the outer shell constituent member.

[Example] The present invention will be described below with reference to an illustrated example. This example is a rotary zoom lens in which the front half of the lens barrel has a large diameter and the rear half has a small diameter. A case in which the invention is applied will be described; a lens barrel in which a gap exists between the inner peripheral surface of the lens barrel and the outer periphery of the lens optical system;
That is, it goes without saying that the present invention is similarly applicable to lens barrels having substantially the same diameter over the entire length and having a large diameter as a whole.

In Fig. 1, the photographing lens optical system capable of zooming consists of a large-diameter focus lens group Ll constituting the first lens group, a second lens group with a lens diameter approximately half that of this lens group,
A variable magnification lens group L2- for zooming consisting of a lens group, and a relay lens group L3.
L4, which are sequentially arranged within the lens barrel. Of these, the variable magnification lens group L2 for zooming performs a zooming operation by moving back and forth while rotating in the optical axis direction.

The lens barrel includes a fixed front lens barrel 1 whose front portion is formed with a large diameter and supports the focus lens group L1 and the variable magnification lens group L2 for zooming, and the relay lens group Ls inside.
, L 4, and a small-diameter rear fixed lens barrel 2 that is integrally joined to the front fixed barrel 1 and constitutes the rear half, and the front fixed lens barrel 1 A zoom ring 3, which is a movable outer structure member for moving the variable power lens group L2, is rotatably arranged on the outer periphery of the lens.

As shown in FIG. 2, the front fixed lens barrel 1 has two stepped large-diameter stepped portions 1a and 1b at its front end, and has approximately the same diameter as the rear fixed lens barrel 2. It is formed of a cylindrical IC. At equidistant positions in the middle of the circumference of the cylinder 1c (3t1 position in this embodiment), cam groove holes 5 are provided for inserting zoom drive pins 4 (see FIG. 1), which will be described later.
are provided at equal intervals on the outer peripheral surface near the rear end of the cylindrical IC (in this example, at 3t!!i) for mounting to fix the rear fixed lens barrel 2. Piece 1d protrudes in the radial direction.

As shown in FIG. 1, a large-diameter focus lens group Ll is supported by a lens holding frame 6 on the inner circumferential surface of the large-diameter stepped portion 1a at the front end of the front fixed lens barrel 1 configured as described above. Behind the lens group L1, a variable magnification lens group L2 is disposed within the cylinder IC so as to be movable in the optical axis direction by means of a lens holding frame 7. Further, the relay lens group L3 is disposed on the inner circumferential surface of the rear fixed lens barrel 2 near the front end by a lens holding frame 8, and the relay lens group L3 is arranged on the inner circumferential surface near the rear end by a lens holding frame 9. The relay lens group L4 is provided.

The rear fixed lens barrel 2 has an outward flange 2a at its front end, and the flange 2a is connected to the front fixed vL barrel 1.
It is integrally connected to the front fixed lens barrel 1 by being connected to the above-mentioned attachment piece 1d formed on the outer periphery of the rear end portion with a connecting screw 10. The outer periphery of this flange 2a is formed to have the same diameter as the large-diameter stepped portion 1a at the front end of the front fixed lens barrel 1, and a zoom ring 3 is provided on the front side of the flange 2a.
A receiving portion 2b is formed toward the front. Further, a mounting mount 2c is formed at the rear end of the rear fixed lens barrel 2 for detachably mounting the zoom lens barrel on the camera body (not shown).

A zoom ring 3, which is an operating member for moving the variable power lens group L2, is rotatably disposed on the outer periphery of the barrel 1c of the front fixed lens barrel 1. This zoom ring 3 is a cylinder 1c
In order to minimize the rotational friction with the rear fixed lens barrel 1, only the front and rear ends of the back surface are attached to the outer peripheral surfaces of the large diameter stepped portion 1b near the front of the fixed lens barrel 1 and the receiving portion 2b of the rear fixed lens barrel 2, respectively. They are designed to touch each other. Therefore, a fairly large gap 11, that is, a dead space, exists between the inside of the zoom ring 3 and the outside of the variable magnification lens group L2 via the cylinder 1c. According to the invention, electrical components, which will be described later, are arranged within this cavity 11.

The zoom ring 3 is provided with rectilinear grooves 12 in the optical axis direction for zooming the variable magnification lens group L2 at equiangular positions in the middle thereof (in this embodiment, 3t!1 position). There is. A zoom drive pin 4, which has passed through the cam groove hole 5 of the cylinder 1c, is inserted into the straight groove 12 as shown in FIG. This zoom drive bin 4 is the variable magnification lens group L.
The same values are provided in the radial direction at equally spaced positions (in this embodiment, three positions) on the outer periphery of the lens holding frame 7 that supports the lens holding frame 7 that supports the lens holding frame 7 . In this way, the zoom drive bin 4 and the cam slot 5. The reason why a plurality of straight grooves 12 are provided at equal intervals is because
This is to ensure smooth zoom driving, and the zoom driving pin 4 is guided by the cam groove hole 5 and moved in the optical axis direction by rotation of the straight groove 12 of the zoom ring 3. Further, this straight groove 12 is covered by the zoom ring 3,
The zoom ring 3 is covered with a non-slip rubber ring 13 so as to be easily rotated so as not to be exposed to the outside. Further, this zoom ring 3 has a fifth ring located at equal intervals on the inner circumferential surface near the rear (in this embodiment, 3t!1 position).
As shown in the figure, an inwardly protruding piece 3a for fixing an electrical equipment support member 14, which will be described next, is integrally provided.

In the lens barrel configured in this manner, when the zoom ring 3 is rotated around the optical axis, the zoom drive pin 4 is rotated together by the linear groove 12, but the pin 4 is not inserted into the cam groove hole 5. Since it is guided and moves in the optical axis direction while rotating around the optical axis, the variable magnification lens group L2 moves back and forth in the optical axis direction to perform zooming.

In the lens barrel that operates in this manner, as described above, there is a gap between the inner peripheral surface of the zoom ring 3 forming the outer component of the lens barrel and the outer periphery of the lens holding frame 7 and the outer periphery of the movement path of the same member. A fairly large gap 11 exists through the cylindrical body 1c. Therefore, electrical components are disposed within the gap 11 by utilizing this gap, and in this embodiment, the support member 14 is used.

As shown in FIG. 4, the support member 14 is formed of a thin cylindrical body disposed in the cavity U so as to cover the cylindrical body 1c, and has a rear end edge. An outward flange 14a is formed for integrally attaching the support member 14 to the zoom ring 3. This flange 14a is provided with mounting holes 14c at three locations corresponding to the inwardly protruding pieces 3a of the zoom ring 3, and screws 17 are screwed into the protruding pieces 3a through these mounting holes 14c. By fitting together, the support member 14 is integrally attached to the zoom ring 3. Further, this support member 14 has a position corresponding to the straight groove 12 of the zoom ring 3;
A slightly larger cut groove 14d is formed by cutting the front edge opposite to the flange 14a. This cut groove 14d has a terminal inner part 14e that is connected to the flange 14a.
It was cut to death up to the point. This is support member 1
4 is inserted into the cavity 11 from behind the cylindrical IC toward the periphery of the cylindrical IC, so that the mounting piece 1d is avoided at this time.

The outer surface of the support member 14 formed in this way, corresponding to the gap 11, is an electrical equipment support surface for mounting and holding electrical equipment, and a guide part 15 for arranging the electrical equipment at a predetermined position. The guide portion 15 is provided with a sheet-like body 16 for electrical equipment such as a flexible board on which an electric circuit is formed, an electric component, or an actuator.
As shown in FIG. 1, the support member 14 supporting the electrical equipment sheet 16 is inserted with the rear end of the cylindrical IC into the cavity 11 marked with -, and the flange 14a is fixed with the screws 17. The support member 14 is integrated with the zoom ring 3 by being attached to the protruding piece 3a.

When the support member 14 is fixed in this manner, the electrical equipment sheet-like body 16 that is not attached to the guide portion 15 which is the support surface of the support member 14 is placed within the cavity 11.

This installation position is near the zoom ring 3, which is a movable outer component on the outer periphery of the lens barrel, and since it is near the outer periphery of the lens barrel, the curvature is gentle and the area is large, so a considerable amount of electrical equipment can be installed. can be built-in easily.

On the other hand, an optical reading means for reading the rotation angle of the zoom ring 3 is provided on a part of the inner surface of the support member 14 near the tip. That is, since the rotation angle of the zoom ring 3 is the amount of movement of the zoom variable magnification lens group L2, this is detected and used as various lens information signals.

As shown in FIGS. 6 and 7, the optical reading means includes a bar code 18 formed of a black and white optical pattern provided on the outer periphery of the inner cylinder IC, and a bar code 18 formed on the support member 14 so as to read this bar code 18. The rotary angle encoder 20 includes a photoreflector 19, which is attached to the inner surface and is formed by a light emitting element 19a and a light receiving cable 19b.

According to the rotation angle encoder 20, which is the optical reading means, the direction and amount of movement of the variable magnification lens group L2 can be detected as lens information based on the rotation direction and rotation angle of the zoom ring 3. Then, this detected lens information signal is
For example, although not shown, the amount of movement of a correction system lens that does not use a cam can be obtained from this information signal, that is, the AF
If the lens is used as a correction lens, the amount of correction can be obtained from this information signal, and this zoom information signal can also be sent to the viewfinder system and used as a signal to display the zoom function in the viewfinder. It is also used as depth of field information according to the focal length or information for fully determining lens extension for AP.

Further, in the above embodiment, the support member 14 is made of a cylindrical member, but it may be made of a regular polygonal cylinder or the like.
As for the mounting means for supporting, well-known means such as screw fixing or adhesion can be used.

In addition, in the present invention, since the electrical component sheet 16 rotates with respect to the fixed lens barrel 1 together with the support member 14 fixed to the zoom ring 3, the electrical component sheet 16 is normally attached to the camera body through the mount member. The lead wires connected to the shaped body 16 are bent into a bundle of flexible lead wires, and are designed to be extended as the support member rotates.

[Effects of the Invention] As described above, according to the present invention, (1) Since the dead space near the inner circumferential surface of the movable outer shell component on the outer periphery of the lens barrel is used to arrange electrical components, It has a large area and can easily accommodate many electrical components.

(2) Since the electrical components are arranged in a region with a relatively gentle curvature, unnecessary stress is less likely to act on the electrical component board and the mounted components.

(3) Since the electrical components are built into the lens barrel, space for the electrical components inside the camera body can be saved.

It is possible to provide a lens with a built-in electrical component that has remarkable effects such as the following.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the upper flat part of a lens with a built-in electrical component showing an embodiment of the present invention, Fig. 2 is a perspective view of the front fixed lens barrel, and Fig. 3 is a perspective view of the front fixed lens barrel. FIG. 4 is a perspective view of the support member; FIG. 5 is a rear view of the zoom ring; FIG. 6 is an enlarged cross-section of the main part of the rotary encoder. 7 is a perspective view of the rotary encoder shown in FIG. 6 above. 1...Front fixed lens barrel (lens barrel body)
3...Zoom ring (movable outer shell component) 11...Gap part

Claims (1)

[Scope of Claims] A sheet-like body for electrical equipment disposed in a gap between a movable outer shell component disposed on the outer periphery of a lens barrel body and the outer periphery of a lens in the lens barrel; a support member attached to the movable outer shell component, the electrical component having a guide portion for assembling and holding the body in a predetermined position within the cavity; lens.