JP2019056944A - Lens barrel and imaging apparatus - Google Patents

Abstract

To provide a lens barrel efficient in assembly work.SOLUTION: The lens barrel comprises: a second base board which includes: a first connection line which is connected to a first electrical component at one end; a second connection line which is connected to a second electrical component at one end; a third connection line which is connected to a first base board (main base board) at one end; a first connector to which the other end of the first connection line is connect; a second connector to which the other end of the second connection line is connected; a third connector to which the other end of the third connection line is connected; a first lens which is disposed between at least one of the first electrical component and the second electrical component and the second base board in the optical axis direction; and a second lens which is disposed between the first base board and the second base board in the optical axis direction. The first connector and the second connector are electrically connected to the third connector.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lens barrel and an imaging apparatus.

  The lens barrel includes a plurality of electrical components, and an FPC (flexible printed circuit board) for supplying power and transmitting signals to each of the electrical components is stretched around the lens barrel (Patent Literature). 1).

JP 2000-304994 A

  In recent years, the number of electrical components in a lens barrel has increased. In particular, in the case of a large lens barrel such as a telephoto lens, a plurality of FPCs are arranged in a complicated manner in the lens barrel, and assembly is not easy.

  An object of the present invention is to provide a lens barrel and an image pickup apparatus with good assembly work efficiency.

The present invention includes a first connection line having one end connected to the first electrical component, a second connection line having one end connected to the second electrical component, and a third connection line having one end connected to the first substrate. A first connector to which the other end of the first connection line is connected; a second connector to which the other end of the second connection line is connected; and a third connector to which the other end of the third connection line is connected. A second lens; a first lens disposed between at least one of the first electrical component and the second electrical component and the second substrate in the optical axis direction; and the first substrate in the optical axis direction. And a second lens disposed between the second substrate and the second substrate, wherein the first connector and the second connector relate to a lens barrel electrically connected to the third connector.
The present invention also relates to an imaging device including the lens barrel.

  According to the present invention, it is possible to provide a lens barrel and an image pickup apparatus with good assembly work efficiency.

It is sectional drawing of a lens-barrel. It is sectional drawing of a front part fixed cylinder. It is sectional drawing of a rear part fixed cylinder. (A) is a perspective view of the rear end portion of the rear fixed tube, and (b) is a perspective view of the rear end portion of the front fixed tube. It is a figure explaining the connection state of FPC, a relay board | substrate, and a main board | substrate.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view of the lens barrel 1. The lens barrel 1 of this embodiment can be separated into a front fixed barrel 10 and a rear fixed barrel 50. FIG. 2 is a cross-sectional view of the front fixed cylinder 10, and FIG. 3 is a cross-sectional view of the rear fixed cylinder 50.

First, the front fixed cylinder 10 shown in FIG. 2 will be described.
As shown, the front fixed cylinder 10 includes a plurality of lens groups L1 to L5, an electromagnetic diaphragm 11, an ultrasonic motor 20, a relative position sensor 25, an absolute position sensor 30, a gyro sensor 31, an autofocus function button 32, and an MF. An interrupt sensor 33, a mode switching manual switch 35, a relay board 40, and the like are provided.

  The electromagnetic diaphragm 11 is a mechanism for adjusting the amount of subject light passing through the electromagnetic diaphragm 11. The diaphragm blades are driven by the drive unit, and the size of the opening formed by the diaphragm blades can be changed.

Among the plurality of lens groups L1 to L5, L4 is a focus lens group L4 that can move to the optical axis OA in order to adjust the focus position.
An ultrasonic motor 20 for driving the focus lens group L4 is disposed on the outer periphery of L4.
The ultrasonic motor 20 generates vibrations in the elastic body by inputting a drive voltage to the piezoelectric body. Then, a rotational force is generated in the moving element by the vibration of the elastic body, and the cam cylinder 21 is rotated.
The focus lens group L4 is cam-engaged with the cam cylinder 21. When the cam cylinder 21 is rotated by the driving force of the ultrasonic motor 20, the focus lens group L4 is moved in the optical axis direction by the cam engagement with the cam cylinder 21, and the focus adjustment is performed.

  The relative position sensor 25 is a high-resolution relative distance encoder such as a GMR (Giant Magneto Resistive) sensor. The relative position sensor 25 detects the relative position of the focus lens group L4, and detects the amount of movement of the focus lens group L4 due to an AF (autofocus) operation / MF (manual focus) operation.

The absolute position sensor 30 is a coarser (lower) encoder than the relative position sensor 25. The absolute position sensor 30 detects the absolute position of the focus lens group L4.
The gyro sensor 31 detects a camera shake amount of an operator who operates the lens barrel 1.
The autofocus function button 32 is a button whose function is changed according to the AF mode. For example, in the AF mode, the autofocus function button 32 is started by pressing the autofocus function button 32, or the autofocus function button 32 is pressed during the AF. The focus lens group L4 is moved to the focus position memorized by depressing the focus lock (fixing the position of the focus lens group L4) by depressing, or depressing the autofocus function button 32.
The MF interrupt sensor 33 detects whether the focus ring is rotating during AF. When the MF interrupt sensor 33 detects that the focus ring has been rotated during AF, the AF mode is switched to the MF mode.
The manual switch 35 is a manual switch that is provided on the outer periphery of the lens barrel 1 and performs camera shake correction ON / OFF switching and AF mode switching.

  FIG. 4 shows a perspective view of the rear end portions (camera mounting side end portions) of the front fixed barrel 10 and the rear fixed barrel 50, where (a) is the rear end portion of the rear fixed barrel 50, and (b). Is the rear end of the front fixed barrel 10.

As shown in FIG. 4B, the relay board 40 is attached to the rear end portion of the front fixed cylinder 10 with screws. The relay substrate 40 is provided with connectors A1, B1, C1, D1, E1, and F1.
FIG. 5 is a diagram illustrating a connection state of the FPC, the relay board 40, and the main board 70. As shown in the figure, FPCa1, FPCb1, FPCc1, FPCd1, FPCe1, and FPCf1 extending from electrical components such as the electromagnetic diaphragm 11 and the ultrasonic motor 20 provided on the front fixed cylinder 10 are connected to the connectors A1 to F1. Is done.

Specifically, FPCa1 for driving the electromagnetic diaphragm 11 extending from the electromagnetic diaphragm 11 is connected to the connector A1.
An FPCb1 for driving the ultrasonic motor 20 extending from the ultrasonic motor 20 is connected to the connector B1.
The connector C1 is connected to the relative position detection FPCc1 extending from the relative position sensor 25.
The connector D1 is connected to an absolute position detecting FPCd1 extending from the absolute position sensor 30.

The connector E1 includes an FPCe1 in which a camera shake detection FPC extending from the gyro sensor 31, a signal detection FPC extending from the autofocus function button 32, and a signal detection FPC extending from the MF interrupt sensor 33 are bundled. Connected.
The connector F1 is connected to an FPC f1 for hand shake correction ON / OFF switching and an AF mode switching signal extending from the manual switch 35.

  The relay board 40 is further provided with connectors A2, B2, CD2, and EF2. These connectors A2, B2, CD2, and EF2 are connected to the connectors A1 to F1. These connectors A2, B2, CD2, and EF2 include FPCa2, FPCb2, FPCcd2, and FPCef2 for connecting to connectors A3, B3, CD3, and EF3 of a main board 70, which will be described later, provided on the rear fixed cylinder 50. Connected.

Specifically, the connector A2 is electrically connected to the connector A1 on the relay board 40, and the FPCa2 extending from the main board 70 is connected.
The connector B2 is electrically connected to the connector B1 on the relay board 40, and the FPCb2 extending from the main board 70 is connected.
The connector CD2 is electrically connected to the connector C1 and the connector D1 on the relay board 40, and the FPCcd2 extending from the main board 70 is connected.
The connector EF2 is electrically connected to the connector E1 and the connector F1 on the relay board 40, and FPCef2 extending from the main board 70 is connected.

As shown in FIG. 3, the rear fixed cylinder 50 includes a shake correction device 60.
The blur correction device 60 moves the blur correction lens group L6 in a plane that intersects the optical axis OA to reduce image blur due to the movement of the lens barrel 1.
The blur correction device 60 includes a movable part 61, a fixed part 62, a position detection part 63, and a VCM (voice coil motor) 64. The movable unit 61 is driven with respect to the fixed unit 62 by the VCM 64 based on the position detected by the position detection unit 63.

As shown in FIG. 4A, the main board 70 is screwed to the rear end of the rear fixed cylinder 50. The main substrate 70 includes two plate-like substrates arranged along the optical axis OA.
The main board 70 is provided with connectors A3, B3, CD3, and EF3 to which FPCa2, FPCb2, FPCcd2, and FPCef2 extending to the relay board 40 provided in the front fixed cylinder 10 are connected.
The main board 70 further includes a connector G3 to which an FPCg2 for supplying power to the shake correction device 60 is connected, a connector H3 to which an FPCh2 to which an electric signal to the shake correction device 60 is transmitted, and a mount. And a connector I3 to which an FPC connected to the side contact is connected. The mount side contact contacts the camera body side contact when the lens barrel 1 is mounted on the camera body to perform communication.

  In the present embodiment, the front fixed cylinder 10 and the rear fixed cylinder 50 are assembled as follows.

  The connectors A1 to F1 of the front fixed cylinder 10 have FPCa1, FPCb1, FPCc1, FPCd1, FPCe1, and FPCf1 extending from electric components such as the electromagnetic diaphragm 11 and the ultrasonic motor 20 provided on the front fixed cylinder 10. It is connected.

  FPCa2, FPCb2, FPCcd2, and FPCef2 are connected to connectors A3, B3, CD3, and EF3 provided on the main board 70 of the rear fixed cylinder 50. The connector G3 is connected to the FPCg2. FPCh2 is connected to connector H3. An FPC up to the mount side contact is connected to the connector I3.

  In this state, the rear fixed cylinder 50 is attached to the rear end portion of the front fixed cylinder 10. Then, FPCa2, FPCb2, FPCcd2, and FPCef2 extending from the rear fixed cylinder 50 are inserted into connectors A2, B2, CD2, and EF2 provided on the relay board 40 of the front fixed cylinder 10.

  Then, the assembly of the lens barrel 1 is completed by fixing the front fixed barrel 10 and the rear fixed barrel 50 with screws or the like.

As described above, this embodiment has the following effects.
(1) Six FPCs extending from the electronic components in the front fixed cylinder 10 are grouped into four in the relay board 40, and the number of FPCs extending to the main board 70 of the rear fixed cylinder 50 is the number of FPCs extending from the electronic parts. It becomes 4 sheets less than the number. Therefore, wiring is easier than in the case where the relay substrate 40 is not provided, space efficiency is improved, and further assembly is easy.

(2) In the relay board 40, by optimizing the arrangement of the connectors, the FPC shape from the electronic component provided on the front fixed cylinder 10 to the relay board 40, and the main board of the rear fixed cylinder 50 from the relay board 40 The shape of the FPC up to 70 can be simplified, and the cost can be reduced in manufacturing the FPC.

(3) By disposing the relay board 40 on the front fixed cylinder 10, the front fixed cylinder 10 can be assembled as a single unit, and the rear fixed cylinder 50 can also be assembled as a single unit. do it. Therefore, assembly is easy and work efficiency is good.
In addition, since there is no need to lengthen the FPC, there is little possibility of disconnection during assembly.

(4) Since the relay board 40 is installed at the rear end of the front fixed cylinder 10, the FPC assembly workability is improved when the relay board 40 is fastened to the rear fixed cylinder 50.

In the present embodiment, the two companies are connected after assembling the front fixed cylinder 10 and the rear fixed cylinder 50. However, after the front fixed cylinder 10 is assembled, the relay board 40 is arranged, and the rear The side members may be assembled sequentially.
In the present embodiment, the electromagnetic diaphragm 11 and the like are exemplified as the electrical components connected to the relay board 40 or the main board 70, but the invention is not limited thereto.
Further, in the present embodiment, the connector C1 and the connector D1 are collectively connected to the connector CD2 on the relay board 40, but the combination to be combined is not limited to the above. It is preferable to combine the combinations to be collected on the relay substrate 40 with the same use of the connected FPC. For example, as in this embodiment, a plurality of FPCs used for signal transmission / reception are combined into one FPC by the relay board 40, and a plurality of FPCs used for power supply are combined into one FPC by the relay board 40. preferable. By separating the signal system and the power system, the influence of noise can be reduced. Further, the number of FPCs to be combined is not particularly limited, and can be changed as appropriate according to the FPC turning in the lens barrel 1 and the arrangement of the connectors on the relay board 40.

  1: lens barrel, 10: front fixed barrel, 11: electromagnetic diaphragm, 20: ultrasonic motor, 25: relative position sensor, 30: absolute position sensor, 35: manual switch, 40: relay board, 50: rear fixed Cylinder, 60: shake correction device, 70: main board

Claims (10)

A first connection line having one end connected to the first electrical component;
A second connection line having one end connected to the second electrical component;
A third connection line having one end connected to the first substrate;
A first connector to which the other end of the first connection line is connected; a second connector to which the other end of the second connection line is connected; and a third connector to which the other end of the third connection line is connected. Two substrates,
A first lens disposed between at least one of the first electric component and the second electric component and the second substrate in the optical axis direction;
A second lens disposed between the first substrate and the second substrate in the optical axis direction;
The first connector and the second connector are lens barrels that are electrically connected to the third connector. The third connection line is disposed between the first substrate and the second substrate in the optical axis direction.
The lens barrel according to claim 1. The third connection line is disposed on a radially outer side of the second lens.
The lens barrel according to claim 1 or 2. At least one of the first electrical component and the second electrical component is disposed closer to the subject side than the second substrate in the optical axis direction.
The lens barrel according to any one of claims 1 to 3. The second substrate is disposed closer to the subject side than the first substrate in the optical axis direction.
The lens barrel according to any one of claims 1 to 4. A first portion having the first electrical component, the second electrical component, the first connection line, and the second connection line;
A second portion having the third connection line and the first substrate,
The first part and the second part can be divided;
The lens barrel according to any one of claims 1 to 5. The second substrate is disposed at a position where the first portion and the second portion are divided.
The lens barrel according to claim 6. The first electrical component and the second electrical component have different functions,
The lens barrel according to any one of claims 1 to 7. The first electric component is a relative position detector;
The second electrical component is an absolute position detector;
The lens barrel according to claim 8.   An imaging apparatus comprising the lens barrel according to any one of claims 1 to 9.

Images