JP2001194570A - Structure for supporting flexible printed wiring of lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a stable U turn operation without interfering with the other member by swelling out of an estimated space range when a flexible substrate having a U turn part is arranged within a lens barrel. SOLUTION: This supporting structure is composed of an attaching part 12a of a flexible printed wiring to the lens barrel, the U turn part 12b, a first adhering surface 12c adhered onto the surface 13d on a flexible substrate holding plate by a double coated tape or the like, a bending part 12d of the flexible printed wiring, a second adhering surface 12e being the surface opposite to the first adhering surface adhered onto the surface 13e on the flexible substrate holding plate by the double coated tape or the like, a mate part 12f to be connected to an electric circuit substrate, and a guide projection 13f for positioning when the flexible printed wiring 12 is adhered. The shape of the guide projection is optional as far as it does not interfere with the other parts, and correct and simple stacking work is performed by matching it to the outside diameter shape of the part 12c and the part 12e of the flexible printed wiring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel structure inside a lens barrel such as an interchangeable lens which can be mounted on a single-lens reflex camera or the like, and a flexible printed wiring support structure in a method of mounting electric wiring.

[0002]

2. Description of the Related Art In recent years, electronic cameras such as auto-focusing have been advanced, and a form in which an electronic circuit, a mounting substrate, a wiring material, and the like are incorporated in a lens barrel and a camera body has become common. A film-shaped flexible substrate is often used as a means for performing electric mounting wiring in a limited space. In particular, in the lens barrel, an electric mounting board is arranged on a fixed part near the mount, and an actuator such as a motor is arranged on a moving group or moving cylinder that moves in the optical axis direction by zooming, focusing, etc. In many cases, the flexible substrate is used to electrically connect a mounting substrate and the movably supported actuator. In this case, the distance between the electric mounting board and the actuator in the optical axis direction changes. As a method for absorbing the change in the distance, at least one U-direction is performed using the characteristic of the flexible substrate. A method of performing turn bending is often used.

[0003]

The above-mentioned U-turn bent portion of the flexible substrate and the portions before and after the U-turn are fixed and attached to a fixing portion or a guide portion so as not to apply unnecessary stress to the flexible substrate. However, it is configured to exist in a space within a predetermined range.

However, if the fixing of the flexible substrate is difficult or the mounting accuracy is poor, the position of the U-turn portion is not fixed, and the U-turn portion is ramped up, protruding from the expected space range and interfering with other members. Is easy to occur.
In addition, since a three-dimensional space is used inside the lens barrel, the inside of the lens deteriorates, such as the flexible substrate being visible from the front and rear of the lens barrel, and an effective external light beam hits the flexible substrate, causing unexpected flare. -In many cases, optical performance such as ghosts was deteriorated.

In order to solve the above-mentioned problems, the present application discloses a method of disposing a flexible substrate having a U-turn portion in a lens barrel without protruding out of an expected space range and interfering with other members. It is intended to be configured to perform an operation.

[0006]

In order to achieve the above object, the invention according to claim 1 of the present application is directed to a driving means mounted on a lens holding member movably supported in the direction of the optical axis; What is claimed is: 1. A lens barrel comprising: an electric circuit board for controlling a driving unit; and a flexible printed wiring for electrically connecting the driving unit and the electric circuit board, the lens barrel being attached to a fixed portion in the lens barrel. A flexible printed wiring support member provided between the driving means and the flexible printed wiring support member to support the flexible printed wiring so as to bend and to be integrated with an inner peripheral portion of the flexible printed wiring support member. A flexible printed wiring support structure for a lens barrel, wherein a light shielding member is provided.

[0007] With this configuration, unnecessary light rays can be cut off at the time of photographing by the light-shielding line at the inner portion of the flexible substrate holding plate, and adverse effects such as ghost and flare can be prevented.

According to a second aspect of the present invention, in the flexible printed wiring support structure of the lens barrel according to the first aspect, the light is provided at a position on the inner periphery of the flexible printed wiring bent to the outer peripheral surface of the light shielding member. A flexible printed wiring support structure for a lens barrel, characterized by having an inclined surface whose diameter is temporarily reduced in the direction of the driving means along an axis.

With this configuration, the flexible board holding plate serves as a guide for the U-turn section operation, and a smooth U-turn operation can be obtained.

[0010] Further, the invention according to claim 3 is based on claim 1.
4. The flexible printed wiring support structure for a lens barrel according to claim 1, wherein the flexible printed wiring support member is provided with a protrusion for determining a fixing position of the flexible printed wiring. It is.

With this configuration, one end of the flexible printed wiring can be accurately positioned,
Space utilization efficiency can be improved.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating a configuration of a zoom lens among interchangeable lenses attached to a single-lens reflex camera, and is a cross-sectional view illustrating a state cut along a cross section parallel to an optical axis. AA 'represents the optical axis. The upper side of the optical axis indicates the case where the focal length is telephoto, and the lower side indicates the case where the focal length is wide. This drawing shows only a configuration necessary for the description of the present application, and unnecessary components are omitted from the drawing.

First, the configuration of the present embodiment will be described. Reference numeral 1 denotes a mount for mounting on a single-lens reflex camera, and 1a
Is rotatably coupled to a bayonet portion of a camera mount (not shown) of the camera body. Reference numeral 2 denotes a fixed cylinder, which is fixed to the mount 1 with screws or the like with a focus washer 3 interposed on the surface 2a. Reference numeral 4 denotes a zoom ring whose inner peripheral surface 4a is radially fitted to the outer peripheral surface 2b of the fixed cylinder 2 and which is screwed into a hole 4b extending in the circumferential direction to a portion 2c of the fixed cylinder 2 with screws. Since the outer circumference of the integrally mounted zoom roller 5 is engaged, the zoom ring is supported rotatably at a fixed position about the optical axis.

Reference numeral 6 denotes a lens holding cylinder, which is radially fitted to the inner peripheral surface 4a of the zoom ring 4 at a fitting protrusion 6a.
The portion 6b is a foot portion that is disposed at three equally-spaced portions in the circumferential direction and protrudes from the outer periphery of the lens holding cylinder 6, and the foot portion 6b
Are engaged with straight guide holes 2d arranged at substantially equal intervals around the optical axis extending along the optical axis direction of the fixed cylinder 2 and supported so as to be movable along the optical axis. There is a moving frame roller mounting portion 6c for mounting the moving frame roller 7 provided at the outermost diameter portion of the foot portion 6b with a screw or the like.
Is installed. The movable frame roller 7 has its outer diameter engaged with the width of a lead groove 4c provided on the inner peripheral surface of the zoom ring 4. Accordingly, the lens holding cylinder 6 moves straight in the optical axis direction according to the amount of rotation of the zoom ring 4 around the optical axis.

Reference numeral 8 denotes another lens holding cylinder, which holds the lens unit L1 on the inner periphery thereof and has an electromagnetic diaphragm integrally attached thereto. 8a is a motor for driving the aperture, and 8b is an electric terminal from the motor 8a. The outer circumference 8c of the lens holding barrel 8 is radially fitted to the inner circumference 6d of the lens holding barrel 6. A plurality of rollers 9 are attached to the 8d portion of the lens holding cylinder 8 in the circumferential direction, and the rollers 9 are fitted into cam grooves 6e provided on the inner peripheral surface 6d of the lens moving cylinder 1.
The lens holding barrel 8 has at least one zoom key engaging projection 8e protruding in the outer diameter direction on the left side in the drawing.
Reference numeral 10 denotes a zoom key.
The 4d portion is integrally fixed with a screw or the like, and the 10b portion is slidably engaged with the zoom key engaging projection 8e of the lens holding barrel 8 in the optical axis direction.

Accordingly, the rotation of the zoom ring about the optical axis causes the zoom key to rotate integrally, and the zoom key 10 is attached to the lens holding barrel 8 movably supported on the inner periphery of the lens holding barrel 6 which moves straight in the optical axis direction. The rotation force of the lens holding tube 8 is transmitted, and the lens holding tube 8 can be extended to the lens holding tube 6 while rotating along the cam groove on the inner periphery of the lens holding tube 6 by the rotation force. I have. Therefore, the rotation of the lens L1 is the same as the rotation angle of the zoom ring 4 and the combined extension amount of the extension amount of the lens holding tube 8 and the extension amount of the cam groove 6e with respect to the fixed cylinder or the mount due to the rotation of the zoom ring 4. Are doing.

Reference numeral 11 denotes an electric circuit board of the interchangeable lens, which includes a motor control circuit and the like. The electric circuit board 11 is fixed to a portion 2e of the fixed cylinder 2 with screws or the like. Reference numeral 14 denotes an electric contact portion, one end of which is soldered onto the electric circuit board 11 and the right end surface of which is exposed on the mounting surface side of the interchangeable lens barrel. When the interchangeable lens is attached, an electric contact portion provided in the portion contacts the camera side to perform electric signal communication or supply power.

Reference numeral 12 denotes a flexible printed wiring,
It is a wiring member for electrically connecting the electric circuit board 11 and the motor 8a. The electric terminal 8 on the motor 8a side
It is soldered to the part b, and is connected by a connector or the like on the electric circuit board 11 side. Reference numeral 13 denotes a flexible board holding plate, which is integrally attached to a fixed cylinder at a portion 13a with screws or the like. The 13b portion on the inner peripheral side has a substantially arc shape at the center of the optical axis extending in the optical axis direction, and a light shielding line is formed on the inner peripheral surface. A portion 13c is a fixing portion of the flexible printed wiring 12.

FIG. 2 is a perspective view showing a method of attaching the flexible printed circuit board 13 and the flexible printed circuit 12. In the figure, reference numeral 12a of the flexible printed wiring is a mounting portion to the lens holding cylinder 8, and 12b
Is a U-turn portion of the flexible printed wiring 12 located in a space inside the interchangeable lens barrel, and 12c is a first adhesive surface adhered to a 13d surface of the flexible substrate holding plate 13 with a double-sided tape or the like. Reference numeral 12d denotes a bent portion of the flexible printed wiring 12, and reference numeral 12e denotes a second surface opposite to the first bonding surface bonded to the 13e surface of the flexible substrate holding plate 13 with a double-sided tape or the like.
12f is a fixed electric circuit board 11
This is the part that goes to the connection. Reference numeral 13f denotes a guide projection serving as a positioning guide when the flexible printed wiring 12 is bonded. The shape of the guide projection is arbitrary as long as it does not interfere with other components, and accurate and simple bonding workability can be obtained by adjusting the outer diameter of the flexible printed wiring to the portions 12c and 12e.

As described above, the movement of the lens holding cylinder 8 holding one end of the flexible printed wiring 12 by zooming is a movement of rotating while moving in the direction of the optical axis. U-turn part 12b
Is provided. FIG. 1 shows the shape of the U-turn portion when the focal length is tele and wide, and the U-turn portion moves between these two states.

Light shielding line portion 1 of flexible board holding plate 13
The outer circumference 13g on the U-turn flexible side of 3b has a shape having a gradient such that the diameter decreases toward the lens holding cylinder 2. In particular, when zooming from the tele side to the wide side, if the vicinity of the U-turn of the flexible printed wiring is displaced in the direction approaching the optical axis, the surface having the gradient is provided to prevent the flexible printed wiring from being caught on the tip of the light shielding line portion 13b. This is effective for smoothly calling in the vicinity of the U-turn.

The light-shielding line portion 13b of the flexible substrate holding plate 13 is made as large as possible in the optical axis direction and the angle direction as long as it does not interfere with other components, thereby adversely affecting image formation on the film surface. In addition to being able to cut light rays, it is also possible to hide the flexible printed wiring and other built-in objects when looking inside the lens from the mount side of the interchangeable lens alone, improving the luxury of the interchangeable lens Can contribute.

(Correspondence between the present invention and the embodiment) The lens holding member in the present invention corresponds to the lens holding cylinders 6, 8 in the embodiment, and the driving means in the present invention corresponds to the motor 8a. Further, the flexible wiring supporting member corresponds to the flexible substrate holding plate 13.

The above is the correspondence between each configuration of the present invention and the embodiment. However, the present invention is not limited to the configuration of the embodiment, and the function described in each claim or
It goes without saying that the present invention may be applied to any device other than the camera as long as the function of the structure of the embodiment can be achieved.

[0025]

As described above, the following effects can be obtained by implementing the flexible printed wiring support structure described in each claim of the present application.

Unnecessary light rays during photographing can be cut by the light-shielding line at the inner diameter portion of the flexible substrate holding plate, and adverse effects such as ghost and flare can be prevented.

The flexible board holding plate serves as a guide for the operation of the U-turn section of the flexible printed wiring,
A smooth U-turn operation can be obtained, and accurate positioning of one end of the flexible printed wiring can be performed, so that the planned operation of the flexible printed wiring can be performed.

Further, the positioning of the flexible printed circuit board and the flexible printed wiring can be easily performed even during the assembling, so that the working time can be reduced.

Further, when the interchangeable lens is used alone, built-in components such as a flexible printed wiring can be made hard to see or hide from the mount side.

Further, by adjusting the attachment position of the flexible substrate holding plate to the fixed cylinder, the operation state of the U-turn portion of the flexible printed wiring can be easily finely adjusted.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a configuration of a zoom lens among interchangeable lenses attached to a single-lens reflex camera according to a first embodiment of the present invention, which is cut along a cross section parallel to an optical axis.

FIG. 2 is a perspective view illustrating a method of attaching a flexible printed circuit board and a flexible printed wiring according to the first embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mount 2 Fixed cylinder 3 Focus washer 4 Zoom ring 5 Zoom roller 6, 8 Lens holding cylinder 7 Moving frame roller 9 Roller 10 Zoom key 11 Electric circuit board 12 Flexible printed wiring 13 Flexible board holding plate 14 Electric contact part

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Atsushi Koyama 3-2-2 Shimomaruko, Ota-ku, Tokyo F-term in Canon Inc. (reference) 2H044 AE06 EC07 5E348 AA28 EF16 EF48

Claims (3)

[Claims] 1. A driving means attached to a lens holding member movably supported in an optical axis direction, an electric circuit board for controlling the driving means, and electrically connecting the driving means and the electric circuit board. A lens barrel having a flexible printed wiring for connection, comprising a flexible printed wiring support member attached to a fixed portion in the lens barrel, wherein the driving means and the flexible printed wiring support member A flexible printed wiring support structure for a lens barrel, wherein the flexible printed wiring is supported between the flexible printed wiring members so as to be bent, and a light shielding member is integrally provided on an inner peripheral portion of the flexible printed wiring supporting member. 2. The flexible printed wiring support structure for a lens barrel according to claim 1, wherein the driving means is disposed along an optical axis at a position inside the flexible printed wiring bent to the outer peripheral surface of the light shielding member. A flexible printed wiring support structure for a lens barrel, which has an inclined surface whose diameter is temporarily reduced in a direction. 3. A flexible printed wiring support structure for a lens barrel according to claim 1, wherein said flexible printed wiring supporting member is provided with a projection for determining a fixing position of said flexible printed wiring. Flexible printed wiring support structure for lens barrel.