JP2003172863A - Electric substrate mounting structure for interchangeable lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optimum electric substrate mounting structure for an interchangeable lens. <P>SOLUTION: In an interchangeable lens unit, at least one hard substrate 5 which is perpendicular to the optical axis and at least one hard substrate 4 which is parallel to the optical axis are arranged and connected by a board-to- board connector 6. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric board mounting structure of an interchangeable lens that can be attached to and detached from a camera, and more particularly to an arrangement structure of electric boards.

[0002]

2. Description of the Related Art In interchangeable lenses for single-lens reflex cameras and the like, electrification is progressing even in interchangeable lens type cameras, as most lenses are equipped with an autofocus system. Along with this, it has become necessary to arrange an electric mounting substrate inside the interchangeable lens for these cameras. However, since the glass lens is arranged in the center of the lens, the following two types of methods are mainly used for the arrangement of the electric substrate. One method is a type in which a hollow donut-shaped hard board is mounted as shown in FIG. 5, and the other method is a flexible board is bent and mounted so as to surround a glass lens as shown in FIG. It is a type.

FIGS. 5 and 6 show a conventional example, in which a hard substrate A is used.
4 and the flexible substrate 9, that is, only the electrical mounting portion is shown. FIG. 5 shows the arrangement of only the hard substrate A4, which causes an increase in the lens diameter depending on the size of the electric component. FIG. 6 shows the arrangement of the flexible substrates 9, and the flexible substrates 9 are connected and arranged in a cylindrical shape. Regarding the flexible substrate 9, a portion on which a relatively large electronic component such as the CPU 7 is mounted is reinforced by a reinforcing plate. According to this conventional example, mounting can be performed without being affected by the size of electric parts such as a CPU.

[0004]

However, each of the above-mentioned conventional board mounting structures has its own drawbacks.

First, the type of mounting a hollow donut-shaped hard substrate has a drawback that the size of electric parts is restricted. For example, for electrical parts,
Since the outer diameter of the CPU, which controls the center of control, is larger than other parts, the width of the substrate is determined by the glass lens diameter and the overall diameter. Therefore, the size of the CPU determines the outer diameter of the entire lens, which may increase the diameter.

Next, regarding the type in which the flexible substrate is bent and mounted so as to surround the glass lens, there is a drawback that the product cost and the die cost of the flexible substrate are high. Therefore, the flexible substrate has a drawback that the cost is significantly increased.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems of the prior art, and in an electric substrate mounting structure of an interchangeable lens that can be attached to and detached from a camera, at least substantially perpendicular to the optical axis. An electric board of an interchangeable lens, comprising one hard board, at least one hard board substantially parallel to the optical axis, and a board-to-board connector connecting both the hard boards. Provide the mounting structure.

Further, in the above-mentioned electric board mounting structure of the interchangeable lens, an elastic member for fixing at least one hard board substantially parallel to the optical axis from the opposite side connected with the connector is provided. An electric board mounting structure for an interchangeable lens is provided.

According to the above structure, it is possible to obtain a low-cost, high-mounting area, and flexible electric board mounting structure of the interchangeable lens.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of an embodiment of the present invention. 2 and 3 show another embodiment of the present invention.
In the figures, the same parts are designated by the same reference numerals. In the figure, 1
Is a glass lens unit, 2 is a lens barrel, 3 is a mount unit, 4 is a hard substrate A, 5 is a hard substrate B, 6 is a connector, 7 is a CPU, and 8 is an elastic member.

The structure of the lens differs depending on the single focus lens, the zoom lens, and the difference in the focal length, but basically the structure is as shown in FIG. The glass lens unit 1 is
It is composed of a glass lens group and a cylinder for holding them.
Further, the lens barrel 2 is an exterior part, and is arranged so as to surround the glass lens unit 1, and a holding structure for the glass lens unit 1, a lens extension structure, a focus and zoom ring, and the like are arranged. The mount unit 3 is an exterior part, and includes a distance display part, a diaphragm ring, and the like. The hard substrate A4 is arranged inside the mount unit, and has a hollow circular shape in order to avoid interference with the glass lens unit 1. The hard substrate B5 is arranged vertically to the hard substrate A4. The connector 6 is
The hard substrate B5 and the hard substrate A4 are electrically and mechanically connected. The CPU 7 is mounted on the hard board B5. Of course, in reality, hard board B5 and hard board A
A large number of other electric components not shown in FIG. 4 are mounted.

Among the electric components mounted on the hard substrate B5 and the hard substrate A4, the electric component having the largest area is CP.
It is U7. When the CPU 7 is to be mounted on the hard substrate A4, the width formed by the difference between the outer diameter and the inner diameter of the hard substrate A4 cannot be mounted unless it is at least larger than the CPU 7. Conversely speaking, the size of the CPU 7 may determine the outer diameter of the lens. However, if the CPU 7 is mounted on the hard board B5, the lens outer diameter can be determined without being influenced by the size of the CPU, and the diameter can be made extremely small.

FIGS. 2 and 3 show another embodiment of the present invention, which is an arrangement example useful when a mounting area is more required than in FIG. In FIG. 2, a plurality of hard substrates B5 arranged perpendicularly to the hard substrate A4 are arranged at different angles along the circumference.

In FIG. 3, a plurality of hard substrates B5 arranged perpendicularly to the hard substrate A4 are arranged on the circumference at the same angle.

Next, FIG. 4 shows a schematic diagram of the configuration of another embodiment of the present invention. In the figure, it is the connector 6 that electrically and mechanically connects the hard substrate B5 and the hard substrate A4. This connection method is a method of press-fitting the contact pin into the hole. Normally, when the number of pins is large, sufficient connection strength is maintained, but basically it is designed so that it can be pulled out by a force in one direction. , Depending on the magnitude of the external force, it may come off. For example, if the lens falls on a hard surface, it is expected that a large amount of force will be applied momentarily. In the substrate arranging method as shown in the drawing, when the dropping direction is the optical axis direction, the connector 6 is in the same direction as the direction in which the connector 6 is removed, and there is a possibility that the connector 6 may be removed. As a countermeasure against this, a method of completely fixing the board can be considered.
If the hard board B5 and the hard board A4 are completely fixed, there arises a problem that the mounting position of the connector 6 becomes severe. If the mounting position of the connector 6 is deviated, the joint portion of the connector 6 is distorted, and problems such as poor electrical connection occur. In other words, as a method of fixing the hard board B5 and the hard board A4, at least one of the boards must be fixed by the connector 6 so that stress is not applied, but at the same time, it is possible to prevent external force from being applied. Drag must also occur.

In the present invention, as shown in FIG. 4, the end surface of the hard board B5 on the opposite side of the connector 6 is pressed by the elastic body 8 to minimize the stress applied to the hard board B5 and to prevent external force. By sandwiching the substrate via the elastic body 8, a resistance force is generated so as not to come off from the connector 6, and an electric disconnection phenomenon does not occur even when dropped. Here, the elastic body 8 is arranged so as to be sandwiched between the hard substrate B5 and the inner wall of the lens barrel 2. For the elastic member, for example, 25% compression load 1.5 to 2.5k
Good results were obtained with an elastic body made of a rubber having a hardness of about g / cm2, for example, urethane rubber.

[0017]

As described above, according to the configuration and method of the present invention, an electric board mounting structure of an interchangeable lens on which electric parts are mounted is provided at a low cost, with a large mounting area, and with a high degree of freedom. A mounting structure can be provided, and an electric board mounting structure having high vibration resistance and shock resistance can be realized.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a second embodiment of the present invention.

FIG. 3 is a schematic configuration diagram showing a third embodiment of the present invention.

FIG. 4 is a schematic configuration diagram showing a fourth embodiment of the present invention.

FIG. 5 is a schematic configuration diagram showing a first conventional example.

FIG. 6 is a schematic configuration diagram showing a second conventional example.

[Explanation of symbols]

1 glass lens unit 2 lens barrel 3 mount unit 4 Hard board A 5 Hard board B 6 connector 7 CPU 8 elastic members 9 Flexible substrate

Claims (2)

[Claims] 1. An electric board mounting structure for an interchangeable lens that is attachable to and detachable from a camera, wherein at least one hard board substantially perpendicular to an optical axis, at least one hard board substantially parallel to the optical axis, and both of the above. An electric board mounting structure for an interchangeable lens, which is composed of a board-to-board connector for connecting a hard board of. 2. An electric member mounting structure for an interchangeable lens according to claim 1, wherein at least one hard substrate substantially parallel to the optical axis is pressed and fixed from the opposite side connected to the connector. An electric board mounting structure for an interchangeable lens, characterized by comprising: