JPH0436155Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a connection structure for printed circuit boards, and in particular, placing printed boards for multiple connections connected to multiple electrical products in different positions in a lens barrel, etc. This invention relates to a printed board connection structure suitable for electrically connecting to a main printed board.

(Prior technology) Flexible printed boards have traditionally been thin and highly flexible, and can be bent freely and efficiently stored in narrow spaces within equipment, making them ideal for camera bodies and lens mirrors. Used in various equipment such as cylinders.

Various electrical components, such as an aperture drive motor, focus, and zoom helicoid drive motors, are distributed and arranged within the highly automated lens barrel. Electrical connections between these electrical components and main printed boards for control and checking located at other locations are mainly made using flexible printed boards for connection.

When the number of electrical components provided in the lens barrel is small, the number of printed boards for connection is also small, and the electrical components can be mounted in the lens barrel relatively easily.

Recently, however, various functions have come to be provided in the lens body, and with this, various electrical parts have come to be installed inside the lens barrel. For this reason, the number of printed circuit boards for connection with these electrical parts has increased, and the wiring of the printed circuit boards inside the lens barrel has become more complex, leading to more electrical failures and making it difficult to check in the event of a failure. There was also a tendency for the cylinder diameter to increase.

(Problems to be solved by the invention) The invention is a method for connecting multiple electrical components placed at various positions in a housing such as a lens barrel to a main printed board placed at other positions. When making electrical connections using a board, it is possible to effectively utilize the space inside the housing, prevent the diameter of the housing from increasing, and easily adjust and check each electrical component. The object of the present invention is to provide a printed circuit board connection structure that can simplify board wiring.

(Means for Solving the Problem) A printed board for multiple connections each electrically connected to a plurality of electrical components arranged in a housing,
The plurality of connection printed boards are overlapped and extended at one place in the cylindrical direction of the casing, and then branched, and each connection part provided on the branched extension is connected to the periphery of the casing. They are connected to the connection parts of other printed boards in a state where they are shifted in the direction.

(Embodiment) FIG. 1 is a perspective view of an embodiment in which the present invention is applied to a part of a lens barrel of a camera, etc., and FIG. 2 is a cross-sectional view of a portion of FIG. 1.

In the figure, 1 is a lens barrel, and 2 is a drive device for automatic focus detection. 13 is an electromagnetic diaphragm, 3 is a lens holding frame, and 4 is a lens system held by the lens holding frame 3. 5 is the back cover, 6 is the lens mount, and 7 is the screw for mounting the mount. Reference numerals 8, 9, and 10 each designate a flexible printed board, of which 8 is a printed board for extracting a zoom signal or focus signal, 9 is a printed board for drive control connected to the drive device 2, and 10 is a printed board for driving control. This is a printed board connected to the electromagnetic diaphragm 13 for diaphragm drive control. 8a, 9a, and 10a are connecting portions to other printed boards, respectively. 12 is the main printed board
It is equipped with a CPU12b, an IC12c, etc., and is normally a band-shaped device rolled into a cylindrical shape and mounted inside the lens barrel 1, but in the figure, it is expanded outside the lens barrel 1 for reference. Shown by condition. The printed board is housed in such a way that it can be taken out from inside the lens barrel 1. A contact block 12d is connected to the main printed board 12, has a plurality of contact pins, and is electrically connected to a contact block of the camera body (not shown).

In this embodiment, there are three connection printed boards 8,
9 and 10 are each extended in the optical axis direction of the lens barrel 1, and are concentrated in one place in the circumferential direction and overlapped, and then taken out from the takeout port 11 provided in a part of the lens holding frame 3. There is. This makes effective use of the space within the lens barrel 1. Further, in this embodiment, after the printed shapes on the connection side of each printed board 8, 9, and 10 are taken out from the takeout port (specifically, the passage formed by the notch) 11,
Connecting portions 8a of each printed board by branching each,
The lenses 9a and 10a are configured in such a shape that they can be placed offset in the circumferential direction of the lens barrel 1.

And these connection parts 8a, 9 arranged in the circumferential direction
a, 10a and the main printed board 12 at respective corresponding positions, that is, joint portions 12 at positions shifted in the circumferential direction.
a1, 12a2, and 12a3 are electrically connected to each other by solder or the like.

Connection parts 8a, 9a, 10a and main printed board 12
After connecting the connecting parts 12a1, 12a2, and 12a3, the side of the main printed board 12 is connected to the lens barrel 1.
The lens is bent to the side and folded into a double layer as shown in FIG. It is housed so as to be along the inner wall surface of the lens barrel 1 and to be removable. This makes effective use of the space within the lens barrel 1, prevents the diameter of the lens barrel from increasing, and facilitates checking of electrical circuits, etc. And back cover 5
and lens mount 6 is attached.

At this time, the contact block 12 of the main printed board 12
d projects from the lens barrel 1, as shown in FIG. 4, and is later fixed to the lens mount 6.

In this embodiment, the main printed board 12 may be opened into a cylindrical shape and accommodated in the lens barrel without being folded in two.

Also, the connection part of each printed board is not necessarily one in the circumferential direction.
It is not necessary to arrange them dimensionally, and they may be arranged two-dimensionally.

(Effects of the invention) According to the invention, by overlapping and extending a plurality of connection printed boards within a cylindrical housing, connection work can be performed on substantially the same plane as other printed boards. In addition, by shifting the connecting portions of this connection printed circuit board and other printed circuit boards in the circumferential direction of the casing, it is possible to improve the connection workability and also achieve miniaturization of the casing. .
In other words, since the connection parts are offset in the circumferential direction, it is possible to connect each connection part of multiple printed circuit boards in parallel, and each connection part can also be connected to other printed circuit boards for connection. There will be no confusion. For example, if multiple connections are set offset in the cylindrical direction of the housing, each connection will interfere with the printed circuit boards for other connections, so the connections must be made in order. This increases the working time and also causes problems regarding workability. In addition, since the connecting portion is shifted in the circumferential direction, the connecting printed circuit board and the other printed circuit board connected to it are longer in the circumferential direction, where there is plenty of dead space in the housing, but they are longer in the cylindrical direction. Therefore, there is no need to increase the size of the casing itself.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an embodiment of the present invention applied to a part of a lens barrel, Figs. 2A, B, and 4 are explanatory views of a part of Fig. 1, and Fig. 3 is a perspective view of an embodiment of the present invention applied to a part of a lens barrel. FIG. 2 is an explanatory diagram when the main printed board of FIG. 1 is folded. In the figure, 1 is a lens barrel, 2 is a driving device, and 3
is a lens holding frame, 4 is a lens system, 5 is a back cover, 6 is a lens mount, 8, 9, and 10 are each printed boards, 11 is an ejection port, 12 is a main printed board, 8
a, 9a, 10a are connection parts, 12a1, 12
A2 and 12a3 are respective coupling parts, and 12d is a contact block.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A plurality of connection printed boards each electrically connected to a plurality of electrical appliances arranged in a housing, wherein the plurality of connection printed boards are connected to the housing. are overlapped in one place in the cylindrical direction and extended, and then each branched, and each connection part provided on the branched extension is shifted in the circumferential direction of the housing and connected to another printed board. A connection structure for a printed circuit board, characterized in that the parts are connected to each other. (2) The connection of printed boards according to claim 1, wherein the connection portions of the plurality of connection printed boards are one-dimensionally shifted in the circumferential direction of the casing. structure.