JP2023125902A - Lens device and imaging apparatus - Google Patents

Abstract

To provide a lens device advantageous for unit replacement.SOLUTION: A lens device (1) has a first unit (10) and a second unit (90) removably fixed to the first unit, which are arranged in order along an optical axis, and the lens device has a first electrical contact (5) provided on the first unit, a second electrical contact (4) provided on the second unit, and a holding member (52) holding the first electrical contact. The first unit is fixed to the holding member so that it can be eccentric to the holding member. Fitting between the holding member and the second unit determines the position of the holding member so as to bring the first electrical contact and the second electrical contact into contact with each other. The first unit is fixed to the second unit so that it can be eccentric to the second unit.SELECTED DRAWING: Figure 4

Description

The present invention relates to a lens device and an imaging device.

2. Description of the Related Art Lens devices are known in which a unit (exchangeable unit) including an optical element can be replaced. Such a lens device includes a base barrel unit and an exchange unit. If the replacement unit is a mount unit, the user selects the replacement unit that corresponds to the mount portion of the camera on which the lens device is mounted (attached). Furthermore, if the replacement unit is a lens barrel unit, the user selects, for example, a replacement unit that has an optical system that corresponds to the image size of the camera. When such units are replaced, it may be necessary to adjust the eccentricity between the units in order to ensure imaging performance.

Further, a lens device is known in which a mount unit including a mount portion of the lens device and a lens barrel unit located in front of the mount unit are provided with electrical contacts that are connected to each other (Patent Document 1). A wire harness connector is used to connect the electrical contacts.

JP2016-057513A

Since the lens device of Patent Document 1 uses a wire harness connector, it is not preferable in terms of workability in connecting and disconnecting electrical contacts during unit replacement. From the viewpoint of workability, it is preferable to use a contact biasing connector such as a spring pin connector for connecting and disconnecting the electrical contacts. In a contact biasing connector (spring pin connector), when a contact (pin, etc.) is connected (pressed) to a conductive member, the contact is pushed against the conductive member by a biasing member (compression spring, etc.) connected to the contact. It is a energized connector. However, when using a contact biasing connector, in order to adjust the eccentricity between units, it is necessary to increase the conductive member that the contact biasing connector comes into contact with by the amount necessary for eccentricity adjustment, which makes it difficult to provide a compact lens device. It can be disadvantageous. An object of the present invention is, for example, to provide a lens device that is advantageous for unit replacement.

One aspect of the present invention is a lens device including a first unit arranged in order along an optical axis and a second unit detachably fixed to the first unit,
a first electrical contact provided in the first unit;
a second electrical contact provided in the second unit;
a holding member that holds the first electrical contact;
the first unit is eccentrically fixed to the holding member;
By fitting the holding member and the second unit, the holding member is positioned such that the first electrical contact and the second electrical contact are in contact with each other,
The lens device is characterized in that the first unit is eccentrically fixed to the second unit.

According to the present invention, for example, it is possible to provide a lens device that is advantageous for unit replacement.

A perspective view showing an example of the configuration of a lens barrel. Front view showing an example of the configuration of a lens barrel Exploded perspective view showing an example of the configuration of a lens barrel A-A sectional view of the lens barrel (Figure 2) BB sectional view of the lens barrel (Figure 2) Diagram showing the front side of the mount unit Diagram showing the rear side of the lens barrel unit Diagram showing an example of the configuration of a lens device and an imaging device

Embodiments of the present invention will be described below with reference to the accompanying drawings. In addition, throughout all the figures for explaining the embodiment, in principle (unless otherwise specified), the same members and the like are denoted by the same reference numerals, and repeated explanation thereof will be omitted.

[Embodiment related to lens barrel]
FIG. 1 is a perspective view showing an example of the configuration of a lens barrel. In the figure, 1 is a lens device (also referred to as a lens barrel) according to the present embodiment. The lens barrel 1 includes a lens barrel unit 90 that includes an optical member 2000a (described later), and a mount unit 10 that includes a mount section 100 that is attached to a camera. FIG. 2 is a front view showing an example of the structure of the lens barrel, and FIG. 3 is an exploded perspective view showing an example of the structure of the lens barrel. A connector 101 including an electrical contact with the camera is fixed to the mount section 100 with a plurality of screws 102. Electrical contacts are also simply referred to as contacts. An insertion hole 31 for inserting the screw 3 is formed in the mount unit 10 in a direction parallel to the optical axis. The mount unit 10 is fixed (fastened) to the lens barrel unit 90 by screwing the screw 3 into a tapped hole 91 formed in the lens barrel unit 90. The lens barrel 1 includes a first unit and a second unit removably fixed to the first unit, which are arranged in order along the optical axis, and at least the first unit and the second unit. One can be a replacement unit.

4 and 5 show a sectional view taken along line AA of the lens barrel (FIG. 2) and a sectional view taken along line BB of the lens barrel (FIG. 2), respectively. FIG. 6 is a diagram showing the front side of the mount unit, and FIG. 7 is a diagram showing the rear side of the lens barrel unit. The lens barrel unit 90 and the mount unit 10 each have a contact 4 (also referred to as a first electrical contact) and a contact 5 (also referred to as a second electrical contact). The contact 4 is a pin, and constitutes a spring pin connector including a coil spring (compression spring) that expands and contracts in the longitudinal direction of the pin. Note that the connector including the contacts 4 is not limited to a spring pin connector. The connector including the contact 4 may be a contact biasing connector in which when the contact is connected (pressed) to the conductive member, the contact is urged against the conductive member by a biasing member connected to the contact. 40 is an electric circuit board, and the spring pin connector is mounted on the electric circuit board 40. 9 is a fixed cylinder, 42 is a support in the fixed cylinder 9, and the electric circuit board 40 is attached to the fixed cylinder 9 via the support 42 with screws 41. Further, 8 is a rear fixed cylinder, and the rear fixed cylinder 8 is attached to the fixed cylinder 9 with screws 80.

50 is an electric circuit board, 103 is a harness, and the contact 5 is mounted on the electric circuit board 50 as a conductive member, and is electrically connected to the connector 101 via the harness 103. In the unit 10, 11 is a fixed cylinder, 12 is a screw, and the mount part 100 is attached to the fixed cylinder 11 by the screw 12. 51 is a screw, 52 is a holding member, and the electric circuit board 50 is attached to the holding member 52 by the screw 51.

Reference numeral 13 indicates a screw (axial screw), and the holding member 52 has an insertion hole 521 into which the screw 13 is inserted in a direction parallel to the optical axis. 111 is a tapped hole formed in the fixed cylinder 11, and the holding member 52 is fixed to the mount unit 10 by screwing the screw 13 into the tapped hole 111. Here, the diameter of the lower part (rear side part) of the insertion hole 521 is larger than the diameter of the shaft part 131 of the screw 13, smaller than the diameter of the head 132 of the screw 13, and the diameter of the upper part (front part; counterbore part) of the insertion hole 521 is ) 522 is larger than the diameter of the head 132. That is, the insertion hole 521 is formed to have a gap with respect to the screw 13. Further, the distance from the lower surface (rear surface; abutting surface) 526 of the holding member 52 to the upper portion 522 of the insertion hole 521 is longer than the shaft portion 131 of the screw 13. With this structure, the holding member 52 and the fixed cylinder 11 (and the mount part 100) are relatively eccentric by the play (difference in diameter) between the shaft part 131 of the screw and the lower part of the insertion hole 521. I can do it.

A through hole 523 is formed in the holding member 52 in a direction parallel to the optical axis, and in order to attach the mount unit 10 to the lens barrel unit 90, the screw 3 is passed through the insertion hole 31 and the through hole 523, and the screw 3 is inserted into the tapped hole 91. Screw together screw 3. With this structure, the holding member 52 is held between the fixed cylinder 11 and the flange surface 81 of the rear fixed cylinder 8 by tightening the screws 3 together. That is, the first unit and the second unit are fastened to each other by screws through holes formed in the holding member in a direction parallel to the optical axis. Here, the inner diameter of the hole is larger than the outer diameter of the screw in consideration of eccentric adjustment between the first unit and the second unit. This structure can be advantageous in terms of omitting the fastening screw dedicated to the holding member 52, downsizing the lens barrel, eliminating loads that may be applied to related members due to forgetting to remove the fastening screw, and improving workability.

A notch 82 is formed in the flange surface 81, and the contacts 4 and 5 come into contact within the notch 82 and are electrically connected for communication. Here, since the holding member 52 abuts against the flange surface 81 and is positioned in the direction of the optical axis 0, the pushing amount of the contact 4 (spring pin) in the direction of the optical axis 0 is defined. Such a structure is advantageous in avoiding poor contact due to excessive pushing or insufficient pushing of the contacts 4. In addition, in this structure, since the contacts 4 and 5 are held by the fixed barrel 11 and the rear fixed barrel 8, respectively, even if vibration or impact is applied to the lens barrel 1, the amount of pushing of the contact 4 will change. It is also advantageous in that it is difficult to do.

Further, by attaching (fitting) the mount unit 10 to the lens barrel unit 90, the outer diameter portion 524 of the holding member 52 fits into the first inner diameter portion 82 of the rear fixed barrel 8. In addition, in the direction of the optical axis, the rotation stopper groove 525 (the concave part of the holding member 52) of the holding member 52 is fitted into the rotation stop pin 83 (the convex part of the lens barrel unit 90) provided on the rear fixed barrel 8. match. Note that the present invention is not limited to this, and a convex portion formed on one of the holding member and the second unit in the direction of the optical axis and a recessed portion formed on the other side of the holding member and the second unit in the direction of the optical axis are fitted. All you have to do is match. In such a structure, by attaching the mount unit 10 to the lens barrel unit 90, the rotation angle of the holding member 52 around the optical axis o with respect to the lens barrel unit 90 is regulated. On the other hand, a gap exists between the second inner diameter part 84 of the rear fixed cylinder 8 and the outer diameter part 112 of the fixed cylinder 11. With this structure, the fixed barrel 11 is pressed by the set screw 86 (eccentric adjustment member; set screw; set screw) inserted into the tapped hole 85 formed in the rear fixed barrel 8, and the lens barrel unit 90 The eccentricity of the mount section 100 can be adjusted relative to the mount section 100. Here, the holding member 52 and the fixed cylinder 11 can be eccentric to each other. Therefore, the eccentricity of the fixed barrel 11 and the mount portion 100 with respect to the lens barrel unit 90 can be adjusted while the eccentric state of the holding member 52 with respect to the lens barrel unit 90 is fixed. That is, the mount unit 10 can adjust the eccentricity of the mount portion 100 while keeping the relative position between the contacts 4 and 5 fixed.

With the above structure, the amount of eccentricity adjustment and the area of the contact point 5 (conducting member) can be determined independently from each other. Therefore, the area needs to be determined by considering only the tolerances of related parts, and the size and spacing of the contact points 5 can be determined regardless of the amount of eccentricity adjustment, making it possible to create a lens barrel that is advantageous not only in terms of workability but also in terms of compactness. can be provided.

Although the above structure is a structure in which the holding member that can be eccentric is provided in the mount unit, it may also be a structure in which the holding member that holds the contact 4 (electric circuit board) is provided in the lens barrel unit so that it can be eccentric. In this case, the contact point 4 can be eccentric with respect to the lens barrel unit, and the optical member in the lens barrel unit is eccentrically adjusted in a state where the holding member is positioned by attaching the mount unit to the lens barrel unit.

Further, the above structure is a structure in which a mount unit having a contact point with the lens barrel unit and a contact point with the camera is attached to the lens barrel unit, but is not limited thereto. The mount unit may be an exchangeable lens barrel unit that includes an optical member. In this case, the eccentricity of the optical member in the exchangeable lens barrel unit is adjusted while the contact point of the exchangeable lens barrel unit (the holding member that holds the contact point) is positioned relative to the contact point 4 of the exchangeable lens barrel unit.

In the above structure, the holding member is made eccentric with respect to the mount and is regulated (positioned; prevented from coming off) in the optical axis direction by the shaft screw. However, such eccentricity tolerance and regulation is not limited to the above structure, but may also be achieved by, for example, screwing the presser ring onto the mount unit via a washer such as a plate washer. Furthermore, such eccentricity tolerance and regulation can also be achieved by a structure in which the holding member is positioned in the direction of the optical axis by one of the lens barrel unit and the exchange unit, and a presser plate that presses down the holding member.

In the above structure, the holding member is positioned by the fit between the outer diameter part and the first inner diameter part of the rear fixed cylinder, and the fit between the rotation stop pin and the rotation stop groove. However, the positioning of the holding member is not limited to the above structure, and may also be performed, for example, by coupling (fitting) the holding member and the rear fixed cylinder to each other via a key (key member).

As can be understood from the above description, according to the present embodiment, it is possible to provide a lens barrel that is advantageous for unit replacement, for example.

[Embodiment related to lens device and imaging device]
FIG. 8 is a diagram showing a configuration example of a lens device/imaging device. The lens device 3000 may be configured to include a lens barrel 2000 including the optical member 2000a illustrated above, and a drive device 1000 (driver) that drives the optical member 2000a or a portion thereof. The drive device 1000 is not limited to including an actuator, and may include only a drive mechanism. Further, the imaging device 10000 may be configured to include the lens device 3000 and an imaging element 4000a (camera device or imaging device main body 4000) that takes (captures) an image formed by the lens device 3000. The camera device 4000 can be configured to include an imaging unit 4000b having an imaging element 4000a and a (camera) operating device 4000c. Note that the driving device 1000 may include a remote control device that communicates with the main body of the lens device 3000 by wire or wirelessly. Furthermore, the camera device 4000 may have a function of transmitting a command value for the optical member 2000a or a portion thereof. The camera device 4000 can generate the command value using, for example, an autofocus function or an auto iris function of the camera device 4000. The operating device 4000c, as a remote operating device, can communicate with the imaging unit 4000b by wire or wirelessly. In addition, the remote control device or the operating device 4000c in the drive device 1000 can select at least one of a command value related to the object distance of the lens device, a command value related to the focal length of the lens device, a command value related to the aperture diameter of the aperture stop of the lens device, etc. can generate one. According to this embodiment, by including the above-described lens barrel, it is possible to provide a lens device or an imaging device that is advantageous for unit replacement in the lens barrel.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the invention.

1 Lens device 4 First electrical contact 5 Second electrical contact 10 Second unit 52 Holding member 90 First unit 900 Optical member

Claims (18)

A lens device including a first unit arranged in order along an optical axis and a second unit detachably fixed to the first unit,
a first electrical contact provided in the first unit;
a second electrical contact provided in the second unit;
a holding member that holds the first electrical contact;
the first unit is eccentrically fixed to the holding member;
By fitting the holding member and the second unit, the holding member is positioned such that the first electrical contact and the second electrical contact are in contact with each other,
A lens device, wherein the first unit is eccentrically fixed to the second unit. The lens device according to claim 1, wherein an outer diameter portion of the holding member and an inner diameter portion of the second unit fit together. A convex portion formed on one of the holding member and the second unit in the direction of the optical axis and a recessed portion formed on the other of the holding member and the second unit in the direction of the optical axis are fitted. The lens barrel according to claim 2, characterized in that: 2. The device according to claim 1, further comprising a key member for positioning the holding member and the second unit relative to each other, and the holding member and the second unit are fitted together via the key member. lens device. The first unit is fastened to the holding member by a shaft screw through a hole formed in the holding member in a direction parallel to the optical axis, and the inner diameter of the hole is larger than the outer diameter of the shaft of the shaft screw. 5. The lens device according to claim 1, wherein the lens device has a larger diameter and is smaller than an outer diameter of the head of the shaft screw. The first unit and the second unit are fastened to each other by a screw through a hole formed in the holding member in a direction parallel to the optical axis, and the inner diameter of the hole is larger than the outer diameter of the screw. The lens device according to any one of claims 1 to 5. Any one of claims 1 to 6, wherein one of the first electrical contact and the second electrical contact is energized relative to the other of the first electrical contact and the second electrical contact. The lens device according to item 1. 8. The lens device according to claim 1, wherein one of the first unit and the second unit includes a mount section that is mounted on a camera device. The mount portion has a third electrical contact that contacts an electrical contact provided on the camera device,
9. The lens device according to claim 8, wherein the first electrical contact and the second electrical contact are connected to the third electrical contact. 10. The lens device according to claim 1, wherein at least one of the first unit and the second unit includes an optical member. 11. The lens device according to claim 1, wherein the holding member is positioned in the direction of the optical axis by the first unit and the second unit. The lens device according to claim 11, wherein the holding member is held between the first unit and the second unit. Claims 1 to 10, further comprising a presser ring screwed onto the first unit, and the holding member is positioned in the direction of the optical axis by the first unit and the presser ring. The lens device according to any one of these items. Any one of claims 1 to 10, further comprising a presser plate that presses the holding member, and the holding member is positioned in the direction of the optical axis by the first unit and the presser plate. The lens device described in . 15. The lens device according to claim 1, further comprising an eccentricity adjustment member that decenters the first unit with respect to the holding member. 16. The lens device according to claim 15, wherein the decentering adjustment member includes a set screw. 17. The lens device according to claim 1, further comprising a drive section that drives the optical member. An imaging device comprising: the lens device according to any one of claims 1 to 17; and an image sensor that takes an image formed by the lens device.

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