JPH01253720A - Flexible printed board - Google Patents

Abstract

PURPOSE:To make the outward shape of the flexible printed board almost rectangular, and to obtain a material efficiently and to reduce the cost by arranging the bent part of the flexible printed board which is positioned on the ridge line part of a pentagonal prism not in parallel to the ridge line, but horizontally. CONSTITUTION:The flexible printed board of a camera which has the pentagonal prisms on the top surface of a main body is bent along the ridge line of a normal prism and stored, so when it is expanded, the board is bent symmetrically about a nearly center Y axis and the material is not obtained efficiently. The Y axis is put on the ridge line of the prism, the connection pin of a hot shoe is avoided by a window M, and the front end of the prism ridge line is also avoided by a V-shaped cut to store the printed board 1 horizontally in the upper space on the prism. Thus, the outward shape of the board 1 is made nearly rectangular, many boards are manufactured by using a board raw material with the same area, and the cost is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a flexible printed circuit board that is housed along the top of a pentaprism of a -eye reflex camera.

In recent years, automatic control of photographic elements in cameras has become more sophisticated, and control circuits have become significantly more dense. Such a high-density circuit is constructed on a flexible printed circuit board, and is attached to the camera so as to wrap around the camera body.The present invention relates to this flexible printed circuit board, and particularly relates to a flexible printed circuit board that covers the top surface of the pentaprism of an eye reflex camera. This invention relates to a flexible printed circuit board that is placed over the top of a camera body.

(Prior Art) As shown in FIG. 5, the top surface of a camera is often provided with an accessory shoe for attaching an accessory such as a flash device to the pentaprism 3 for an eye reflex finder. In particular, at present, a so-called hot shoe 6 having a contact point for electrically connecting the flash device and the camera body is often provided, and in this case, the ridgeline of the roof surface of the pentaprism is curved at the rear. In the rear space between the hot shoe 6 and this prism 3, a connection pin P projects downward from the hot shoe 6, and the space where the flexible printed circuit board 1 does not come into contact with the connection pin P is narrow along the ridgeline of the pentaprism. Therefore, the conventional flexible printed circuit board is stored along the ridgeline of the pentaprism so as not to come into contact with the connection bin or the like. As mentioned above, the ridgeline of the pentaprism is slanted downward, so the overall shape of the flexible printed circuit board is as shown in Figure 4, with the portion Y contacting the ridgeline of the pentaprism having different ridge heights at the front and back.
It has a dog-shaped shape with .

(Problem to be Solved by the Invention) Because the shape of a conventional flexible printed circuit board is a dogleg shape, when manufacturing a flexible printed circuit board, it is difficult to
As shown in the figure, there was a problem in that material extraction from the substrate material was difficult, resulting in high costs.

An object of the present invention is to solve the above-mentioned problems and to enable a flexible printed circuit board to be punched out from a board material with minimum loss.

(Means for Solving the Problem) In a flexible printed circuit board that is placed across the pentaprism on the top surface of the camera body, the central bent portion located on the pentaprism ridgeline is arranged horizontally and not parallel to the pentaprism ridgeline. As a result, the printed circuit board has an approximately rectangular shape.

(Function) As shown in FIG. 2, the space in which the flexible printed circuit board can be stored in the center of the top surface of the camera body is the gap between the camera top cover and the pentaprism for the single-lens reflex finder. The problem that the present invention particularly addresses in this gap is that
This is the space between the pentaprism provided on the camera body and the hot shoe (a component that connects and fixes the flash to the top and also makes electrical connections) provided on the top cover of the camera.

As is clear from the figure, this space has different ridgeline heights at the front and rear of the prism, and on the other hand, the bottom surface of the hot shoe is a horizontal surface in order to mount the flash horizontally, so the space above and below the kneading at the rear is wide. To prevent the printed circuit board from touching the connection pins that protrude downward from the shoe, the front part of the flexible printed circuit board does not have to be retracted along the entire length of the ridge of the prism. A V-cut is provided in the top of the pentaprism so that the front part of the pentaprism ridgeline protrudes above the printed circuit board, and the center bending part Y of the printed circuit board is located at a lower position than the highest part of the pentaprism ridgeline. By increasing the distance from the bottom surface and providing a window where the connection pin contacts, the bent part of the flexible printed circuit board is placed in the space above the pentaprism without forcing the central bent part of the printed circuit board to follow the ridgeline of the pentaprism. It can be stored horizontally. If the flexible printed circuit board is stored with the bent portion Y horizontal in this way, the outline of the flexible printed circuit board can be made into a substantially rectangular shape as shown in FIG. .

The present invention is based on the above-mentioned idea, and the flexible printed circuit board is made into a rectangle as shown in FIG. 1, and the material for the flexible printed circuit board is efficiently removed from the board material.

(Jikho Koi 13'l) Fig. 1 shows an embodiment of the present invention.
is a rectangular flexible printed circuit board that is stored on the top surface of the camera body so that the bent part Y is located directly above the ridgeline of the pentaprism, and the window M is located directly below the connection pin of the camera hot shoe. As shown in FIG. 9, the flexible printed circuit board 1 alternately changes its orientation,
The flexible printed circuit board 1 is formed on a substrate material so that the concave and convex portions engage with each other, and the flexible printed circuit board 1 is manufactured by punching out the substantially rectangular shape shown in the figure from the substrate material. ■ is a V-cut part on the front edge of the printed circuit board, and 7 is a lead extending from the printed circuit board that connects the circuit on the printed circuit board to the connection pin of the hot shoe, the tip of which is inside the cut mentioned above. It is located at

FIG. 2 is a perspective view showing the state in which the flexible printed circuit board 1 is stored in the space between the camera body 2 and the camera upper cover 5. 4 and the gap between the camera body 2 and the camera upper blade bar. FIG. 3 is a sectional view showing the stored state of the flexible printed circuit board 1 in the space between the prism and the hot shoe. The window M is separated from the front part of the ridgeline of the pentaprism by the cut part on the edge, and is located at a position lower than the height of the highest part of the front end of the ridgeline of the pentaprism, and as shown in the figure, the window M is located near the hot shoe 6.
It is horizontally stored in the gap between the pentaprism 3 and the hot shoe so as to be placed directly below the connection pin P of the pentaprism 3.

In this embodiment, a window M is provided to avoid the connection pin of the hot shoe, and a cut portion is provided to avoid the front end of the pentaprism ridgeline. If it is a camera, there is no need to avoid connecting pins, so there is no need to provide a window etc. Therefore, if the present invention is applied to such a camera, the mounting area of the flexible printed circuit board will be increased, and the mounting capacity will be increased. It is also possible to obtain the effect that .

Further, even in a camera having a hot shoe, the mounting capacity can be increased by making the window etc. as small as possible.

(Effects of the Invention) According to the present invention, by making the shape of the flexible printed circuit board rectangular, it is possible to manufacture more flexible printed circuit boards from the same area of board material, thereby reducing costs.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an embodiment of the present invention, Fig. 2 is a perspective view of the above embodiment in use, Fig. 3 is a detailed view of main parts of the above embodiment in use, and Fig. 4 is a conventional example. FIG. 5 is a detailed view of the main parts of a conventional camera. 1...Flexible printed circuit board, 2...Camera body, 3...Penta prism, 4...Camera outer casing, 5
...Camera top cover, 6...Hot shoe, Y...
・Bending part, M...Window, P...Connection terminal.

Claims (1)

[Claims] In a flexible printed circuit board placed across the pentaprism on the top of the camera body, the central bent portion located on the pentaprism ridgeline is placed horizontally, rather than parallel to the pentaprism ridgeline, so that the outline of the printed circuit board can be approximated. A flexible printed circuit board characterized by its rectangular shape.