JPH0642382Y2 - Lens barrel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a lens barrel in which a flexible or rigid printed circuit board, which is widely used in electrical equipment, is housed in a barrel, and particularly to a donut shape or its shape. The present invention relates to a lens barrel having a shape suitable for mounting a so-called arc-shaped main printed circuit board having a shape lacking a part in an arc-shaped housing.

(Prior Art) Conventionally, flexible printed circuit boards are thin and have excellent flexibility, can be flexibly bent freely, and can be efficiently housed in a narrow space inside the equipment, so it can be used in many electrical equipment. It is used.

Generally, when a flexible printed circuit board is mounted in a narrow space such as an electric device, the flexible printed circuit board is deformed into a shape corresponding to the space shape.

For example, when the flexible printed circuit board is mounted in the lens barrel of the photographing system, especially when it is mounted in a donut-shaped space sandwiched between the outer lens barrel and the inner lens barrel, the main printed circuit board of the flexible printed circuit board Is mounted in the shape of an arc band. At this time, in order to electrically connect to another printed circuit board, there is a method in which a projecting piece is provided on a part of the outer circumference of the arc-shaped main printed circuit board and the connection pattern portion provided on this projecting piece is used. . Then, generally, after connecting the two printed circuit boards to each other through a projecting piece provided in the normal direction to the arc-shaped main printed circuit board, the projecting piece is bent and superposed on the main printed circuit board, and is then placed in the lens barrel. It may be implemented.

(Problems to be solved by the invention) In this case, depending on the shape of the projecting piece, when the projecting piece is superposed on the main printed circuit board, the projecting piece protrudes into the effective diameter of the lens system in the lens barrel, or Depending on the shape of the mounting part, when the protruding piece is pulled out of the lens barrel, it may come into contact with the lens barrel, making it extremely difficult to perform work such as soldering or checking electrical circuits through the protruding piece. May be.

(Means for Solving the Problems) The present invention provides a flexible or rigid printed circuit board having a main printed circuit board having an arcuate band shape and a protruding piece protruding from a part of the outer periphery thereof, for example, a donut shape in a lens barrel. Suitable for photographic cameras, video cameras, etc. that have a form that can be mounted with high work efficiency when soldering etc. to easily and electrically connect to another printed circuit board in the space of The purpose is to provide a lens barrel.

The present invention provides a substantially donut-shaped space between a first barrel having a lens and a second barrel having a diameter larger than that of the first barrel.
In a lens barrel for arranging an arcuate band-shaped main printed circuit board, a curvature substantially equal to the arcuate band shape of the main printed circuit board through a mounting portion having a flexible region part on a part of the outer periphery of the main printed circuit board. An arc strip-shaped projecting piece having, and the mounting direction of the mounting portion to the main printed circuit board is shifted by 20 to 80 degrees with respect to the normal direction of the arc strip shape of the main printed circuit board. At the same time, the protruding piece is bent at the position of the mounting portion and overlapped on the surface of the main printed circuit board to be housed in the lens barrel.

(Embodiment) FIG. 1 is a perspective view of an embodiment of the present invention when a printed circuit board is housed in a donut-shaped space in a lens barrel, and FIG. 2 is a view from A of FIG. 1 and FIG. FIG. 4 is an explanatory diagram when a part of FIG. 2 is stored in a lens barrel.

Reference numeral 3 in the drawing denotes a flexible or rigid printed circuit board having a main printed circuit board 1 and a protruding piece 2. Reference numeral 4 denotes a mounting portion, which is a protruding piece 2 on a part of the outer periphery of the main printed circuit board 1.
Is provided, and a part or all of the flexible region is formed. Reference numeral 5 denotes an outer lens barrel, and 6 denotes an inner lens barrel, which holds a lens system.

The main printed circuit board 1 in this embodiment is a flexible or rigid substrate having a donut-shaped arcuate band shape, and electric components such as ICs, resistors and capacitors are provided on the surface of the substrate.

The projecting piece 2 is made of a flexible or rigid substrate having an arcuate band shape lacking a part of a donut shape, and is projected through a mounting portion 4 provided on a part of the outer periphery of the main printed circuit board 1. The protruding piece 2 is provided with a plurality of connection pattern portions 21 for electrically connecting to another printed circuit board, a check pad 22 for checking an electric circuit and the like.

The mounting portion 4 is partially or wholly formed of a flexible region, and has a form in which the protruding portion 2 overlaps with the main printed circuit board 1 when folded, as shown in FIG.

In particular, as shown in FIG. 2, the mounting portion 4 is provided such that the mounting direction 41 of the mounting portion 4 is deviated from the center line of curvature of the arcuate band of the main printed circuit board 1, that is, the normal direction 42. As a result, as shown in FIG. 3, when the protruding portion 2 is bent on the mounting portion 4 and superposed on the main printed circuit board 1, the protruding portion 2 is within the effective diameter of the lens system held by the lens barrel 6. I try not to stick out.

Further, the mounting portion 4 has such a length and flexibility that it can be pulled out to a plane substantially parallel to the plane of the main printed circuit board 1 as shown in FIG. 4 when the projecting portion 2 is pulled out to the outside of the lens barrel 5. It has a form of.

This facilitates the work of soldering the connection pattern portion 21 provided on the protrusion 2 and checking the electric circuit.

In this embodiment, when the shape of the projecting portion 2 is superposed on the main printed circuit board 1, it is configured so as to be substantially concentric with the arc-shaped shape of the main printed circuit board 1 as shown in FIG.

As a result, the effective area of the protruding portion 2 is increased, and many circuit patterns can be installed.

In this embodiment, as shown in FIG. 2, when the angle formed by the mounting direction 41 of the mounting portion 4 and the normal direction 42 of the arcuate strip shape of the main printed circuit board 1 in the mounting portion 4 is θ, 20 ° ≦ θ It is better to set it as <80 °. If the same conditions are not satisfied, it is not preferable because the projecting piece 2 protrudes into the effective diameter of the lens system of the lens barrel 6 or it becomes difficult to increase the effective area of the projecting piece.

In this embodiment, in order to facilitate bending of the flexible region of the mounting portion 4, notches or holes may be formed, or the surface coating layer (coverlay) may be removed on one side or an unnecessary region.

Further, in the present embodiment, the main printed board 1, the projecting portion 2 and the mounting portion 4 may all be constituted by flexible boards. The main printed circuit board 1 may not have a donut shape, but may have a shape in which a part thereof is cut off.

(Effect of the Invention) According to the present invention, the main printed circuit board and the projecting piece are formed in an arc band shape having substantially the same curvature, and are attached by being shifted by 20 to 80 degrees with respect to the normal direction of the arc band shape. Even if the effective area of the projecting piece is expanded, the main printed circuit board and the main printed circuit board are arranged in a donut-shaped space in the lens barrel so that they do not protrude into the effective diameter of the lens system when they are folded and overlapped at the mounting position. The protruding piece can be stored.

Further, when manufacturing the printed circuit board according to the present invention, the cost is determined by how many sheets can be taken in a sheet of a certain size. Therefore, as shown in FIG. 5, two printed circuit boards are made to face each other by their protruding pieces. The cost will be lower if the longitudinal dimension when combined in the state is made as small as possible.
Therefore, as is apparent from this figure, from the dimension 1 in the (A) figure of those whose protrusions are mounted in the normal direction, the dimension 1'in the (B) figure of those that are removed from the normal direction is shown. It is smaller and cheaper to manufacture.

[Brief description of drawings]

1 is a perspective view of an embodiment of the present invention when a printed circuit board is mounted in a donut-shaped space in a lens barrel, FIG. 2 is a view of FIG. 1A, and FIG. 3 is FIG. Fig. 4 is an explanatory view when the protruding piece in Fig. 4 is housed in the lens barrel, Fig. 4 is a side view of Fig. 1, and Fig. 5 is an explanatory view at the time of material removal in manufacturing a printed circuit board according to the present invention. is there. In the figure, 1 is a main printed circuit board, 2 is a protruding piece, 3 is a printed circuit board, 4 is a mounting portion,
Reference numeral 5 is an outer lens barrel, and 6 is an inner lens barrel.

Claims (1)

[Scope of utility model registration request] 1. A main printed circuit board having an arc band shape in a substantially donut-shaped space between a first lens barrel having a lens and a second lens barrel having a diameter larger than that of the first lens barrel. In the lens barrel for disposing, the protrusion of an arc strip shape having a curvature substantially equal to the arc strip shape of the main printed circuit board through an attachment portion having a flexible region on a part of the outer periphery of the main printed circuit board. A piece is provided, and the attaching direction of the attaching portion to the main printed circuit board is displaced by 20 to 80 degrees with respect to the normal direction of the arc band shape of the main printed circuit board, and the protruding piece is A lens barrel, wherein the lens barrel is housed in the lens barrel by bending at the position of the mounting portion and overlapping the main printed circuit board surface.