JP3879490B2 - Lens barrel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lens barrel including an electric substrate on which an electric component is mounted.
[0002]
[Prior art]
FIG. 7 is a diagram showing the first prior art.
The main CPU 116 is an in-lens CPU mounted on the electric board 110, in which a drive control program such as a motor or a data communication program is written.
The fixed cylinder 101A is formed so that the main CPU 116 and the inner wall do not interfere with each other by increasing the outer diameter.
[0003]
FIG. 8 is a diagram showing a second prior art.
The connector 113 is a connection terminal mounted on the electric board 110. By connecting an FPC as shown in FIG. 8, a main CPU (not shown) or a non-volatile memory (not shown) is connected from a personal computer provided outside. Various programs or data can be written in the means.
[0004]
[Problems to be solved by the invention]
However, in the lens barrel according to the first prior art described above, the main CPU 116 has a large outer shape, and in order not to interfere with this, the outer diameter of the fixed cylinder 101A is increased, which hinders downsizing of the product. There was a problem of becoming. In particular, as the performance of a product increases and the number of actuators to be controlled increases or high-precision control is required, the program capacity increases, and accordingly, the main CPU 116 becomes larger and the product becomes smaller. There was a problem that it became more difficult.
[0006]
An object of the present invention is to provide a small lens barrel even when an electric component having a large outer shape is incorporated.
[0007]
[Means for Solving the Problems]
The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this. That is, the invention according to claim 1 is an electric board provided along the optical path (L1 to L4) and a plane substantially orthogonal to the optical axis of the imaging optical system and provided outside the optical path of the imaging optical system (10) and an electric part (13, 16) mounted on the electric board so as to be disposed outside the optical path of the photographing optical system, and a substantially cylindrical shape that covers the electric board and forms an external surface. And an external cylinder (1a) having a hole (1a) opened at a position corresponding to the electrical component, and a lid (12) detachably provided in the hole and blocking the hole. And the electric board has a protrusion inserted into the hole of the external cylinder, and the electric component is mounted on the electric board including the protrusion. This is a lens barrel.
[0009]
The invention of claim 2 is the lens barrel according to claim 1, wherein the electrical component, it is a main CPU (16) for controlling the lens barrel, a lens barrel according to claim.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.
FIG. 1 is a cross-sectional view of a lens barrel according to an embodiment of the present invention, taken along the main CPU 16.
The fixed cylinder 1 is a member that becomes a base that does not move regardless of the positions of the lens groups L1 to L4, and is an external appearance cylinder in which a part of the outer peripheral surface is exposed to the outside to form an external appearance surface.
The movable members 8 and 9 that can move in the optical axis direction are fitted on the inner peripheral side of the fixed cylinder 1, and the movable members 8 and 9 hold the lens groups L3 and L4, respectively. A moving member 7 that can move in a direction substantially orthogonal to the optical axis is held at the tip of the fixed cylinder 1, and the moving member 7 holds the lens group L <b> 2.
[0019]
Further, the cam ring 2 is fitted on the outer peripheral side of the fixed cylinder 1, and only rotation around the optical axis is allowed. A moving member 3 having a helicoid screw at the tip is fitted on the outer peripheral side of the cam ring 2, and a holding member 4 that holds the lens unit L1 is screwed through the helicoid screw.
[0020]
Further, a focus operation ring 5 and a zoom operation ring 6 are rotatably fitted to the fixed cylinder 1. When the focus operation ring 5 is rotated, the holding member 4 is rotated, and the lens group L1 is moved in the optical axis direction by the helicoid screw so that the subject can be focused. The focus operation ring 5 can be operated manually or can be driven by a lens drive motor (not shown). When the zoom operation ring 6 is rotated, the cam ring 2 is rotated by a connecting key (not shown), and the lens groups L1, L3, and L4 are moved in the optical axis direction by the cam groove of the cam ring 2 and the straight groove of the fixed cylinder. Scaling operation is possible.
[0021]
The lens group L2 is driven in a direction to cancel out camera shake detected by a camera shake detection sensor (not shown) and in a direction substantially orthogonal to the optical axis by a camera shake correction motor (not shown). The electric substrate 10 is a hard substrate that is fixed to the fixed cylinder 1 with screws 14 in a direction along a plane substantially orthogonal to the optical axis, and is arranged in a substantially annular shape (so-called donut shape) around the optical path. By arranging the electric substrate 10 in a substantially annular shape as described above, the entire length of the lens barrel can be shortened. Further, by using a hard substrate, a further reduction in size can be realized by increasing the degree of integration as a multilayer structure substrate.
The electric board 10 includes a driving control circuit for a lens driving motor (not shown) that drives the lens group L1, a driving control circuit for a blur correction motor (not shown) that drives the lens group L2, and a camera (not shown). A circuit for data communication with the body is formed.
The mount 11 is fixed to the fixed cylinder 1 with a screw (not shown), and has a terminal (not shown) that performs data communication with a camera body (not shown).
[0022]
FIG. 2 is a view showing a CC cross section in FIG.
As shown in FIGS. 1 and 2, a hole 1 a is provided at a position behind the fixed cylinder 1 (on the mount 11 side) and close to the electric substrate 10, and the switch block is used as a lid for closing the hole 1 a. 12 is detachably provided on the fixed cylinder 1. The switch block 12 is provided with a switch for switching between auto focus and manual focus, a switch for determining whether or not to perform camera shake correction, and the like.
[0023]
The main CPU 16 is an in-lens CPU (electrical element) mounted on the surface (first surface) on the mount 11 side of the electric substrate 10, and a drive control program such as a motor and a data communication program are written therein. . The lens barrel in this embodiment includes an autofocus mechanism and a shake correction mechanism, and the main CPU 16 that performs these controls is between the inner wall of the fixed cylinder 1 and the optical path of the photographing optical system (L1 to L4). The outer shape is larger than the space provided in the.
The main CPU 16 is disposed on the electric board 10 in the vicinity of the hole 1a for the switch block 12 described above. Since the main CPU 16 has a large outer shape, the electric board 10 also has a protruding portion corresponding to the main CPU 16. The protruding portion is disposed so as to be inserted into the hole 1 a of the fixed cylinder 1.
[0024]
In the above-described conventional lens barrel, the fixed barrel 101A is arranged on the outer peripheral side of the projecting portion, leading to an increase in the size of the lens barrel. However, in the present embodiment, only the protruding portion of the electric board 10 is covered with the switch block 12. For this reason, the outer diameter of the lens barrel is increased only at the minimum necessary part, thereby preventing an increase in the size of the conventional lens barrel. Further, since the switch block 12 is used to cover the cover, there is no need to add another member, and it does not appear unnaturally popping out.
[0025]
FIG. 3 is a cross-sectional view of the embodiment of the lens barrel according to the present invention cut along the vicinity of the connector 13.
FIG. 4 is a view showing an AA section in FIG.
The connector 13 is a connection terminal member mounted on the subject-side surface (second surface) of the electric board 10 and is provided near the hole 1a. The connector 13 is a member that inserts an FPC (Flexible Printed Circuits) 15 (see FIGS. 5 and 6) when writing a program to the main CPU 16 and enables communication with the outside.
Further, in the present embodiment, the main CPU 16 and the connector 13 are provided at positions near the back (true back) of each other with the electric board 10 interposed therebetween. By arranging in this way, it is not necessary to enlarge the hole 1a or provide a sub-number.
[0026]
5 and 6 are diagrams showing a state in which the program is written by inserting the FPC 15 into the connector 13 in FIGS.
In this embodiment, the connector 13 is exposed through the hole 1a and the FPC 15 can be easily inserted simply by removing the switch block 12. Therefore, since it is not necessary to modify the mount 11, the mounting accuracy attached in the process is maintained as it is, and readjustment and re-inspection after writing the program are unnecessary.
[0027]
According to this embodiment, the switch block 12 covers only the protruding portion of the electric board 10 on which the CPU 16 is mounted. Therefore, the outer diameter of the lens barrel is increased only at the minimum necessary part, and the lens barrel can be reduced in size. In addition, since it is covered with the switch block 12, it is not necessary to add another member and the cost is not increased.
Furthermore, the program can be written only by removing the switch block 12, and the mount 11 need not be changed. For this reason, the attachment accuracy attached in the process can be maintained as it is, readjustment after program writing and re-inspection become unnecessary, and the cost can be reduced. Furthermore, when repairing, the workability is good and the repair can be made inexpensive.
[0028]
(Deformation)
The present invention is not limited to the embodiment described above, and various modifications and changes are possible, and these are also within the equivalent scope of the present invention.
(1) In this embodiment, the hole 1a provided in the fixed cylinder 1 is an example of a hole for the switch block 12, and the present invention is not limited to this. That is, the present invention can be applied to any structure as long as the hole is structured so as to cover and cover other parts in the finished product state. For example, not a switch block but a product name plate or a non-slip rubber ring may be used.
[0029]
(2) In the present embodiment, an example in which the main CPU 16 is provided as an electric element having a large shape is shown, but the present invention is not limited to this, and other large electric elements may be used.
[0030]
(3) In the present embodiment, the connector 13 has been described as a connector for writing a program and data to the main CPU 16, but the present invention is not limited to this. For example, data communication such as writing or reading data to an EEPROM or CPU It may be a connector for performing the above.
[0031]
(4) In the present embodiment, the example in which the main CPU 16 and the connector 13 are provided separately on both surfaces of the substrate 10 near the hole 1a is shown. However, the present invention is not limited to this example. May be arranged, or another hole may be provided at a position different from the hole 1a. Further, only the main CPU 16 or only the connector 13 may be disposed near the hole 1a.
[0032]
【The invention's effect】
As described above in detail, according to the present invention , an electrical component mounted on an electrical substrate, an external cylinder having a hole opened at a position corresponding to the electrical component, and a removable portion are provided in the hole. A lid portion that closes the hole portion , the electric board has a protruding portion that is inserted into the hole portion of the external appearance cylinder, and the electric component is mounted on the electric substrate including the protruding portion. Therefore, an electrical component can be arrange | positioned and utilized using a hole part effectively.
[0033]
Further , according to the present invention , even if the electrical component is a large electrical component , a small lens barrel can be obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an embodiment of a lens barrel according to the present invention, taken along the vicinity of a main CPU 16;
2 is a view showing a CC cross section in FIG. 1. FIG.
FIG. 3 is a cross-sectional view of an embodiment of a lens barrel according to the present invention cut in the vicinity of a connector 13;
4 is a view showing an AA cross section in FIG. 3. FIG.
5 is a diagram showing a state in which an FPC 15 is inserted into the connector 13 and a program is written in FIG. 3. FIG.
6 is a diagram showing a state in which a program is written by inserting an FPC 15 into a connector 13 in FIG. 4;
FIG. 7 is a diagram showing a first conventional technique.
FIG. 8 is a diagram showing a second prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fixed cylinder 1a Hole 2 Cam ring 3, 7, 8, 9 Moving member 4 Holding member 5 Focus operation ring 6 Zoom operation ring 10 Electric board 11 Mount 12 Switch block 13 Connector 14 Screw 15 FPC
16 Main CPU
L1-L4 lens group

Claims (2)

Photographic optics,
An electrical board provided along the plane substantially orthogonal to the optical axis of the photographing optical system and provided outside the optical path of the photographing optical system;
An electrical component mounted on the electrical substrate so as to be disposed outside the optical path of the imaging optical system;
A substantially cylindrical member that covers the electrical substrate and forms an exterior surface, the exterior tube having a hole that is open at a position corresponding to the electrical component;
A detachably provided hole, and a lid that closes the hole ;
The electric board has a protrusion inserted into the hole of the external appearance cylinder, and the electric component is mounted on the electric board including the protrusion.
A lens barrel characterized by The lens barrel according to claim 1 ,
The electrical component is a main CPU that controls the lens barrel;
A lens barrel characterized by

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