JPH0637370Y2 - Lens barrel with built-in printed circuit board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a lens barrel having a flexible or rigid printed circuit board, and particularly for efficiently and easily connecting to other electric parts. The present invention relates to a lens barrel having a built-in printed circuit board having a simple structure.

(Prior Art) Conventionally, when a flexible printed circuit board, particularly an arc-shaped printed circuit board, is mounted inside the lens barrel, for example, as shown in FIG. The printed circuit board 60 was mounted in the recess 62 provided along the circumferential direction.

In the figure, 63 is an electric component such as an IC, 64 is a lens mount, 65 is a contact for electrically connecting to the camera body side,
66 is a moving tube for focusing.

(Problems to be Solved by the Invention) As described above, conventionally, the printed circuit board 60 has been arranged in a space where the lens effective diameter is relatively small and at a position distant from the lens mount 64. For this reason the printed circuit board 60
In the electrical connection from the to the contact 65, the lead wire tends to be long and the connection structure tends to be complicated.

In addition, the work efficiency was very poor because the electric circuit of the printed circuit board 60 can be checked only after removing many members constituting the lens barrel.

Further, in the conventional method of connecting the contact supported by the mount with the lead wire and the printed circuit board, when the lens mount is once detached for assembly or repair, the lens mount is attached again, The lead wire sometimes protruded into the effective diameter of the lens system.

(Means for Solving the Problems) A lens barrel having a built-in printed circuit board according to the present invention has a camera mount and a detachable lens mount. Is provided with a contact for electrically connecting to the camera body, is in the lens barrel and is adjacent to the lens mount in the optical axis direction, and the lens mount and the barrel member on the camera body side. A ring-shaped or arc-shaped printed circuit board having an opening in the space through which the light flux passes is disposed in the space between the printed circuit board, and a protruding piece for connecting to the contact is provided on the printed circuit board via a flexible mounting portion. The protruding piece is formed in an arcuate band shape, and overlaps with the printed circuit board when connecting the contact in a state where the mounting portion is curved in a substantially U shape. It has a feature.

(Operation) With the above-described structure, the present invention simplifies the connection between the contact points of the lens mount and the printed circuit board, facilitates checking the electric circuit of the printed circuit board, and removes the lens mount from the lens barrel body. , A printed circuit board having features that, even if it is reattached, it is possible to prevent disconnection of the portion connecting the printed circuit board and the contact, and also to prevent it from protruding into the effective diameter of the lens system. It is possible to provide a built-in lens barrel.

(Embodiment) FIG. 1 is a side view of an embodiment in which a flexible printed circuit board according to the present invention is housed in a donut-shaped space near a lens mount in a lens barrel, and FIG. It is an exploded perspective view when mounting a flexible printed circuit board to a part of lens barrel.

Reference numeral 3 in the drawing denotes a flexible or rigid printed circuit board, which has a main printed circuit board 1 and a protruding piece 2. Reference numeral 4 denotes a linear mounting portion for providing the projecting piece 2 on a part of the outer circumference of the main printed circuit board 1, and part or all of which is formed of a flexible region.
1a is an electric component such as an IC, 5 is a fixed barrel, and 6 is a movable barrel holding a lens system 10.

7 is a lens mount that attaches to and detaches from the camera mount,
Reference numeral 8 denotes a contact block provided in a part of the lens mount 7, and the contact blocks of the camera body (not shown) are electrically connected to each other. Reference numeral 8a is a contact connecting portion connected to the protruding piece 2 of the printed circuit board 3, and 9 is a ring-shaped or donut-shaped space portion formed by the fixed barrel 5 and the lens mount 7. 3 is installed. Reference numerals 11 and 12 are cam followers inserted in the cam grooves for zooming, and 13 is a cam barrel.

In this embodiment, the main printed circuit board 1 of the printed circuit board 3 is fixed to the arcuate protrusion 5a located at the rear end of the fixed cylinder 5 on the optical axis, and the space 9 between the protrusion 5a and the lens mount 7 is fixed. Is attached to.

The main printed circuit board 1 in this embodiment is a ring-shaped or arc-shaped flexible or rigid substrate, and an electric component 1a such as an IC, a half resistor and a capacitor is mounted on the surface of the main printed circuit board 1.

Reference numeral 30 is an actuator for operating the lens function, 31 is a switching member, and these are provided on, for example, the fixed barrel 5 of the lens barrel. Reference numerals 32 and 33 respectively denote connecting portions, which are the connecting portions 1b on the arcuate outer periphery of the main printed circuit board 1 in the printed circuit board 3.
Connected with.

The projecting piece 2 is made of a flexible or rigid board having an arcuate band shape lacking a part of the ring shape, and is projected through a linear mounting portion 4 provided on a part of the outer periphery of the main printed board 1. ing. The projecting piece 2 is provided with a plurality of connection pattern portions for electrically connecting with each contact of the contact block 8 and a check pad for checking an electric circuit or the like.

The mounting portion 4 is partially or wholly formed of a flexible region portion, and as shown in FIGS. 1 and 2, a protruding piece when curved in a substantially U shape in a cross section including the optical axis. 2 has a form in which the main printed circuit board 1 conforms to the arcuate band shape and overlaps.

In particular, the mounting portion 4 is curved in a substantially U shape so that when the projecting piece 2 is superposed on the main printed circuit board 1, the projecting piece 2 does not protrude into the effective diameter of the lens system held by the movable barrel 6. ing.

Further, the mounting portion 4 has such a length and flexibility that the protruding piece 2 can be pulled out to a plane substantially parallel to the plane of the main printed board 1 when the protruding piece 2 is pulled out to the outside of the fixed cylinder 5.
This facilitates the work of soldering the connection pattern portion provided on the protruding piece 2 and checking the electric circuit.

In this embodiment, the shape of the protruding piece 2 is formed so as to be substantially concentric with the arcuate band shape of the main printed circuit board 1 when superposed on the main printed circuit board 1.

As a result, the effective area of the projecting piece 2 is increased and many circuit patterns can be formed.

In the present embodiment, it is preferable not to provide a notch or a hole or to provide a coverlay in order to easily bend the flexible region of the mounting portion 4.

In the present embodiment, the main printed circuit board 1, the protruding piece 2, and the mounting portion 4 may all be composed of flexible boards.

FIG. 3 is a side view of another embodiment when the printed circuit board 3 according to the present invention is stored in a donut-shaped space near the lens mount portion of the lens barrel, and FIG. 4 is the printed circuit board shown in FIG. FIG. 3 is an exploded perspective view showing a state in which 3 is attached to the lens barrel.

In the figure, the same elements as those shown in FIGS. 1 and 2 are designated by the same reference numerals.

Projection of fixed barrel 5 near lens mount 7 of lens barrel
5a may not exist on the same plane due to the structure of the lens barrel, and may have a step structure.

Therefore, in the embodiment shown in FIGS. 3 and 4, the electrical component 1a on the main printed circuit board 1 of the flexible printed circuit board 3 is used.
The mounting surface is provided with a plurality of steps, and the printed circuit board 3 is accommodated in accordance with the space shape formed by the fixed cylinder 5 and the lens mount 7 to effectively utilize the space.

For example, an electric component having a high dimension corresponding to the height is provided on the surface of the main printed circuit board 1 in a space having a large height.

The shape of the printed circuit board in each of the above embodiments is not limited to the ring shape, but may be an arcuate band shape in which a part is cut off.

According to the present invention, the printed circuit board is provided at a position adjacent to the lens mount in the optical axis direction, and the projecting piece provided on the printed circuit board is connected to the contact point of the lens mount. It is not necessary to circulate and the connection reliability can be improved.

In addition, generally, a donut-shaped space is formed between the lens mount and the rear end of the optical axis of the lens barrel, and the printed circuit board can be arranged in the extra space, so that the lens barrel can be printed without increasing the size. The board can be built in.

Further, since the projecting piece of the printed circuit board is provided via the flexible mounting portion, if the projecting piece is connected to the contact of the lens mount while the mounting portion is curved in a substantially U shape, The mounting portion can easily absorb a slight dimensional error of each component, and even when the lens mount is removed due to an initial circuit check or a failure, the mounting portion can absorb the movement of removing the lens mount. The work can be prevented and the work can be simplified, and since the projecting piece is formed in an arcuate band and overlaps with the printed circuit board in a state where the mounting portion is curved, the effective area of the projecting piece is increased. It is also possible to prevent the protrusion of the lens system into the effective diameter of the lens system.

[Brief description of drawings]

FIG. 1 is a side view of a lens barrel according to an embodiment of the present invention, and FIG.
1 is an exploded perspective view of the main part of FIG. 1, FIG. 3 is a side view of a lens barrel of another embodiment of the present invention, and FIG. 4 is an exploded perspective view of the main part of FIG. FIG. 5 is a side view of a conventional lens barrel. In the figure, 3 is a printed circuit board, 1 is a main printed circuit board, 2 is a protruding piece, 4 is a mounting portion, 5 is a fixed tube, 6 is a moving tube, 7 is a lens mount, 8 is a contact block, and 9 is a donut-shaped space. It is a department.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shoji Eguchi, Shoji Eguchi, 770, Shimonoge, Takatsu-ku, Kawasaki-shi, Kanagawa Canon Inc., Tamagawa Plant (56) -100730 (JP, U) Actually open 61-140311 (JP, U)

Claims (2)

[Scope of utility model registration request] 1. A lens barrel having a camera mount and a detachable lens mount, which is attachable to a camera body, wherein the lens mount is provided with a contact for electrically connecting to the camera body. In the lens barrel, a region adjacent to the lens mount in the optical axis direction and passing a light beam in a space between the lens mount and the lens barrel member on the camera body side is defined as an opening. A ring-shaped or arc-shaped printed circuit board is provided, and a protruding piece for connecting to the contact is provided on the printed circuit board via a flexible mounting portion, and the protruding piece is formed in an arc-shaped belt. A lens barrel having a built-in printed circuit board, wherein the lens barrel is overlapped with the printed circuit board when the mounting portion is bent into a substantially U shape and is connected to the contact. 2. An actuator for operating a lens function is provided in the lens barrel, and an electrical connection portion with the actuator is provided on an arcuate outer periphery of the printed board. A lens barrel incorporating the printed circuit board according to claim 1 of the new model registration.