JP6973398B2 - Lens device - Google Patents

Description

The present technology relates to a lens device provided with an operation ring such as a focus operation ring and a zoom operation ring, and more particularly to a technical field for detecting a rotation amount and a rotation direction of the operation ring.

For example, in various lens devices such as interchangeable lenses, video cameras, and digital still cameras, optical elements such as lenses are arranged inside, and the optical elements are moved in the optical axis direction by rotating an operation ring provided on the outer peripheral side. Some are configured to allow focusing and zooming.

Examples of the method for performing focusing and zooming by rotating the operation ring include a mechanical drive method and an electric drive method. The mechanical drive method is a method in which a cam ring for moving an optical element and an operation ring are mechanically connected, and a force corresponding to the rotation of the operation ring is mechanically transmitted to the cam ring to move the optical element. .. The mechanical connection between the cam ring and the operation ring is performed by parts such as gears, rollers, and keys.

In the electric drive method, the rotation amount and rotation direction of the operation ring are electrically read by a predetermined sensor, the drive amount of the optical element is calculated by the calculation circuit, and the drive circuit drives the actuator based on the calculated drive amount. This is a method of moving an optical element.

In the mechanical drive method, since the optical element and the operation ring are mechanically connected, the optical element follows and moves even if the amount of rotation of the operation ring is small. However, since the mechanical drive method uses a cam ring having a large size, it is difficult to reduce the size of the lens device. Further, in a cam ring having a large size, it is difficult to drive the optical element at high speed and minutely in conjunction with the operation. For this reason, it has not been able to meet the recent needs of moving the optical element at high speed and minutely, especially when shooting moving images.

On the other hand, in the electric drive method, since the optical element is moved by an electric actuator, it is easy to move the optical element at high speed. Further, since the cam ring used in the mechanical drive system can be omitted, the lens device can be miniaturized.

Here, the electric drive method is classified into a "speed-increasing method" and a "direct reading method" depending on the difference in the method of electrically reading the rotation amount and the rotation direction of the operation ring.
The speed-increasing method is a method in which the rotation of the operation ring is accelerated by a gear and the increased rotation is read by a rotation detection device. In the speed-increasing method, the rotation of the operation ring is accelerated by a gear, which does not reach the mechanical drive method, but has an advantage that the detection resolution of the rotation amount can be improved. However, there is a disadvantage that hysteresis in the rotation direction of the operation ring is likely to occur due to the backlash of the speed increasing gear. Further, there is a disadvantage that it is difficult to adopt it in a lens device that performs a retractable operation. In a lens device that performs a retractable operation, the lens frame that holds the lens is extended / retracted by a cam ring, but the rotation detection device is large in the speed-increasing method, and if the rotation detection device is placed inside the lens device, it interferes with the lens frame. Resulting in. In order to avoid this interference, it is necessary to secure a space for arranging the rotation detection device in the radial direction of the lens device, and as a result, the size of the lens device is promoted.

In the direct reading method, as described in Patent Document 1 below, reflective surfaces and non-reflective surfaces are alternately arranged on the inner peripheral surface of the operation ring, and a light emitting element and a light receiving element are arranged at positions facing the reflective surface. This is a method in which a photoreflector is arranged, the light emitted from the light emitting element with the rotation of the operation ring is received by the light receiving element, and the output waveform is read according to the change in the intensity of the received light. See, for example, paragraph [0002]).

In the direct reading method, two photo reflectors are provided so that the rotation direction of the operation ring can be detected. The two photoreflectors are arranged so that the output waveforms of the light receiving elements of each other have a phase difference of, for example, 90 degrees. As a result, when the operation ring is rotated forward, the phase of the output waveform of one light receiving element is ahead of the output waveform of the other light receiving element, and when it is rotated in the reverse direction, the phase of the output waveform of the other light receiving element is one. It is ahead of the output waveform of the light receiving element of the above, and the rotation direction of the operation ring can be detected based on the phase relationship of each output waveform.

The direct reading method does not cause hysteresis in the rotation direction of the operation ring, which is a problem in the speed-increasing method, and since the photoreflector is small, it can be suitably applied to a lens device that performs a retractable operation.

Japanese Unexamined Patent Publication No. 2015-141232

However, in the conventional direct reading method, since the two photoreflectors are individually mounted, an error is likely to occur in the positional relationship between the photoreflectors, and the phase difference of the output waveform tends to vary from product to product.

In the direct reading method, it is possible to increase the detection resolution of the amount of rotation by narrowing the pitch between the reflective surface and the non-reflective surface, but to improve the resolution, the pitch between the reflective surface and the non-reflective surface is narrowed. The above-mentioned variation in phase difference cannot be ignored.
That is, in the conventional direct reading method, the formation pitch of the reflective surface and the non-reflective surface cannot be sufficiently narrowed due to the positional error between the two photoreflectors, and there is a limit to the improvement of the detection resolution.

Therefore, the purpose of this technique is to improve the detection resolution of the operation ring rotation amount while suppressing the increase in size of the lens device.

The lens device according to the present technology includes an operation ring to be rotated, a light emitting element that emits light, and a plurality of light receiving elements, which are alternately arranged in the rotation direction of the operation ring and move with the rotation of the operation ring. A detection pattern portion having a reflective surface and a non-reflective surface is provided, the light emitting element emits light to the detection pattern portion, and the plurality of light receiving elements are arranged on the same substrate from the reflective surface. It receives reflected light.

By arranging a plurality of light receiving elements on the same substrate, the positional relationship between the light receiving elements is determined with high accuracy, and the tolerance for narrowing the pitch of the detection pattern by the reflective surface and the non-reflective surface is increased.
Further, since the direct reading method is adopted, the cam ring used in the mechanical drive method can be omitted.

In the lens device according to the present technology described above, it is desirable that the light receiving surface of the plurality of light receiving elements is arranged so as to face the reflecting surface.

As a result, the reflected light is efficiently received by the light receiving element.

The lens device according to the present technology described above includes two light receiving elements, a first light receiving element and a second light receiving element, and emits light from the light emitting element in a line-up direction in which the reflective surface and the non-reflective surface are lined up. It is desirable that the center of the surface is located between the center of the light receiving surface of the first light receiving element and the center of the light receiving surface of the second light receiving element.

This facilitates the number of light emitting elements to be provided when each of the two light receiving elements receives the reflected light from the reflecting surface.

In the lens device according to the present technology described above, at least a part of the first light receiving element and at least a part of the second light receiving element are positioned within the arrangement range of the light emitting element in the alignment direction. desirable.

As a result, the separation distance between the two light receiving elements in the alignment direction is shortened.

In the lens device according to the present technology described above, it is desirable that all of the first light receiving elements and all of the second light receiving elements are located within the arrangement range of the light emitting elements in the alignment direction.

As a result, the separation distance between the two light receiving elements in the alignment direction is further shortened.

In the lens device according to the present technology described above, at least a part of the first light receiving element and the second light receiving element are within the arrangement range of the light emitting element in the pattern orthogonal direction which is the axial direction of the rotation axis of the operation ring. It is desirable that at least a part of is located.

As a result, the separation distance between the two light receiving elements in the direction orthogonal to the pattern is shortened.

In the lens device according to the present technology described above, it is desirable that all of the first light receiving elements and all of the second light receiving elements are located within the arrangement range of the light emitting elements in the direction orthogonal to the pattern.

As a result, the separation distance between the two light receiving elements in the direction orthogonal to the pattern is further shortened.

In the lens device according to the present technology described above, the first substrate on which the light emitting element is arranged is provided, and the second substrate, which is the substrate on which the plurality of light receiving elements are arranged, is arranged on the first substrate. Is desirable.

As a result, not only the positional relationship between the light receiving elements but also the positional relationship between the light receiving element and the light emitting element can be determined with high accuracy.

In the lens device according to the present technology described above, it is desirable that the widths of the reflective surface and the non-reflective surface in the arrangement direction in which the reflective surface and the non-reflective surface are lined up are 0.3 mm or less, respectively.

As a result, sufficient detection resolution can be obtained in actual use.

In the lens device according to the present technology described above, the reflective surface is formed as a part of the inner peripheral surface of the operation ring, and the non-reflective surface is a non-reflective carrier formed on the inner peripheral surface of the operation ring. It is desirable that it is formed as an inner surface.

Since the reflective surface is formed as a part of the inner peripheral surface of the operation ring, the reflective surface is formed as a part of, for example, the inner peripheral surface of the operation ring made of metal or the inner peripheral surface of the operation ring plated with metal. This makes it possible to enhance the deterrent against aging or breakage of the reflective surface as compared with the case where the reflective surface is formed by printing.

In the lens device according to the present technology described above, it is desirable that the non-reflective carrier is formed in a film shape.

As a result, the amount of protrusion of the non-reflective carrier is suppressed in the radial direction of the lens device, and the space to be secured between the light receiving element and the light emitting element and the detection pattern portion can be reduced.

In the lens device according to the present technology described above, it is desirable that the non-reflective carrier is a protrusion protruding in the inner peripheral direction of the operation ring.

This eliminates the need to form the non-reflective carrier in the form of a film.

In the lens device according to the present technology described above, the non-reflective surface is formed as a part of the inner peripheral surface of the operation ring, and the reflective surface is the inner surface of the reflective carrier formed on the inner peripheral surface of the operation ring. It is desirable that it is formed as.

Since the non-reflective surface is formed as a part of the inner peripheral surface of the operation ring, the operation ring can be formed of a general-purpose resin.

In the lens device according to the present technology described above, it is desirable that the reflective carrier is formed in a film shape.

As a result, the amount of protrusion of the reflective carrier is suppressed in the radial direction of the lens device, and the space to be secured between the light receiving element and the light emitting element and the detection pattern portion can be reduced.

The lens device according to the present technology described above includes a ring-shaped member that rotates integrally with the operation ring on the inner peripheral side of the operation ring, and the non-reflective surface is a part of the inner peripheral surface of the operation ring. The reflective surface is formed and is formed as an inner surface of a reflective carrier located at predetermined intervals in the rotational direction in the ring-shaped member.
It is desirable that at least the non-positional portion of the reflective carrier in the rotational direction of the ring-shaped member is transparent.

This eliminates the need to form a reflective carrier on the operating ring.
Further, since the non-reflective surface is formed as a part of the inner peripheral surface of the operation ring, the operation ring can be formed of a general-purpose resin.

In the lens device according to the present technology described above, it is desirable that the reflective carrier is formed on the inner peripheral surface of the ring-shaped member.

This makes it possible to reduce the amount of the reflective carrier material used as compared with the case where the reflective carrier is formed on the outer peripheral surface of the ring-shaped member.

In the lens device according to the present technology described above, a ring-shaped member that rotates integrally with the operation ring is provided on the inner peripheral side of the operation ring, and the reflection surface is formed as a part of the inner peripheral surface of the operation ring. The non-reflective surface is formed as an inner surface of the non-reflective carrier located at predetermined intervals in the rotational direction in the ring-shaped member, and the ring-shaped member is at least non-reflective of the non-reflective carrier in the rotational direction. It is desirable that the part is transparent.

This eliminates the need to form a non-reflective carrier on the operating ring.
Further, since the reflective surface is formed as a part of the inner peripheral surface of the operation ring, the reflective surface is, for example, a part of the inner peripheral surface of the operation ring made of metal or a part of the inner peripheral surface of the operation ring plated with metal. As compared with the case where the reflective surface is formed by printing, it is possible to enhance the deterrent against time-dependent defects and breakage of the reflective surface.

In the lens device according to the present technology described above, it is desirable that the non-reflective carrier is formed on the inner peripheral surface of the ring-shaped member.

This makes it possible to reduce the amount of the non-reflective carrier material used as compared with the case where the non-reflective carrier is formed on the outer peripheral surface of the ring-shaped member.

The lens device according to the present technology described above includes two light receiving elements, a first light receiving element and a second light receiving element, and has a first light receiving signal which is a light receiving signal of the first light receiving element and the second light receiving element. A calculation circuit for calculating the rotation amount of the operation ring based on a second light receiving signal which is a light receiving signal of the element and a plurality of threshold values set for each of the first light receiving signal and the second light receiving signal is provided. Is desirable.

As a result, the amount of rotation is calculated based on a plurality of points in the waveforms of the first light receiving signal and the second light receiving signal.

In the lens device according to the present technology described above, the calculation circuit calculates the rotation amount by using a plurality of reference coordinates set on the Lisaju circle as threshold values for the first light receiving signal and the second light receiving signal. Is desirable.

As a result, the rotation amount calculation based on the Lissajous circle is performed under the condition that the positional accuracy of the two light receiving elements is high.

According to this technology, it is possible to improve the detection resolution of the operation ring rotation amount while suppressing the increase in size of the lens device.
The effects described herein are not necessarily limited, and may be any of the effects described in the present disclosure.

It is a schematic external perspective view of the lens apparatus as 1st Embodiment. It is a schematic perspective view when the lens apparatus is cut in the direction orthogonal to the optical axis at the position of the AA'line shown in FIG. It is an enlarged view of the part shown by the broken line in FIG. It is a schematic diagram of the detection pattern part in an embodiment. It is a schematic perspective view which saw the detection part from the operation ring side. It is a figure which represented the positional relationship between the detection part and the detection pattern part schematically. It is a front view of the detection part. It is a figure which represented typically the appearance that the detection pattern part and a light emitting surface, a light receiving surface, and a light receiving surface face each other. It is a figure showing the waveform of each received light signal with a phase difference of 90 degrees. It is a block diagram for demonstrating the structure of the whole optical element drive system in the lens apparatus as 1st Embodiment. It is the figure which represented the output waveform from two photoreflectors by a rectangular wave. It is a front view of the detection part as a 1st modification. It is a front view of the detection part as a 2nd modification. It is a front view of the detection part as a third modification. It is a schematic perspective view which looked at the detection part as a 4th modification as a modification from the outer peripheral side of an operation ring. It is a schematic perspective view which showed the main part of the lens apparatus as a 2nd Embodiment in an enlarged manner. FIG. 3 is a schematic perspective view showing an enlarged main part of a lens device as a third embodiment. It is the schematic perspective view which showed the main part of the lens apparatus as the 4th Embodiment in an enlarged manner. FIG. 5 is a schematic perspective view showing an enlarged main part of a lens device as a fifth embodiment. It is a figure for demonstrating the calculation method of the rotation amount based on a Lissajous circle. It is a figure for demonstrating the calculation method of the rotation amount by a cross point method.

Hereinafter, embodiments will be described in the following order with reference to the accompanying drawings.

<1. First Embodiment>
[1-1. Configuration related to rotation amount detection]
[1-2. Configuration of the entire optical element drive system]
[1-3. Contrast with conventional]
[1-4. Modification example related to the arrangement of the light emitting element and the light receiving element]
<2. Second embodiment>
<3. Third Embodiment>
<4. Fourth Embodiment>
<5. Fifth Embodiment>
<6. About rotation amount calculation method ＞
<7. Summary of embodiments>
<8. Modification example>
<9. This technology>

<1. First Embodiment>
[1-1. Configuration for rotation amount detection]

First, with reference to FIGS. 1 to 8, a configuration mainly related to rotation amount detection in the lens device 1 as the first embodiment will be described.
FIG. 1 is a schematic external perspective view of the lens device 1, and FIG. 2 is a schematic perspective view of the lens device 1 when the lens device 1 is cut in a direction orthogonal to the optical axis Axo of the lens device 1 at the position of the AA'line shown in FIG. , FIG. 3 is an enlarged view of the portion shown by the broken line in FIG.

The lens device 1 is configured as an interchangeable lens that can be attached to and detached from a camera device main body (camera body) (not shown), and has a substantially cylindrical outer shape.
Hereinafter, the axial direction of the optical axis Axo is defined as the front-back direction of the lens device 1. The side mounted on the camera device body is defined as the rear side, and the opposite side is defined as the front side.

The lens device 1 has two operation rings consisting of a focus operation ring 2f, which is an operator for adjusting the focus, and a zoom operation ring 2z, which is an operator for adjusting the zoom, and a camera device main body located at the rear end portion. A detachable portion 3 having a detachable mechanism, a front lens 4 located at the front end portion and guiding light from a subject to the inside of the lens device 1, and a lens housing portion 5 supporting the focus operation ring 2f and the zoom operation ring 2z. I have.

The focus operation ring 2f and the zoom operation ring 2z are arranged apart from each other in the axial direction of the optical axis Axo, and the outer peripheral surface is exposed to the outside world. In this example, the rotation axes of the focus operation ring 2f and the zoom operation ring 2z substantially coincide with the optical axis Axo, respectively. That is, the rotation directions of the focus operation ring 2f and the zoom operation ring 2z substantially coincide with the axial direction of the optical axis Axo.
Hereinafter, the rotation direction of the focus operation ring 2f is referred to as “rotation direction R” (see FIG. 3).

The lens housing portion 5 represents a portion of the cylindrical portion covering various optical elements arranged inside the lens device 1 excluding the focus operation ring 2f and the zoom operation ring 2z.

Although not shown, as the optical element inside the lens device 1, for example, a fixed focus lens, a movable focus lens, a variable magnification lens, an iris, a relay lens and the like are provided in this order from the front side. When the focus operation ring 2f is rotated, the movable focus lens moves along the optical axis Axo to adjust the focus. Further, when the zoom operation ring 2z is rotated, the variable magnification lens moves along the optical axis Axo to adjust the zoom.

In the lens device 1, the movable focus lens corresponding to the rotation operation of the focus operation ring 2f is driven by the above-mentioned electric drive method. That is, an actuator for driving the movable focus lens is provided inside the lens device 1. This point will be explained later.

Inside the lens device 1, a fixing member 6 having a substantially annular shape is arranged on the inner peripheral side of the focus operation ring 2f (see FIGS. 2 and 3). The position of the fixing member 6 is fixed inside the lens device 1, and the outer peripheral surface 6a is positioned so as to face the inner peripheral surface 2fa of the focus operation ring 2f.
A substantially circular opening M is formed on the inner peripheral side of the fixing member 6.

At a position facing the outer peripheral surface 6a of the fixing member 6, a detection pattern portion 22 in which the reflective surface 20 and the non-reflective surface 21 are alternately arranged in the rotation direction R is provided. In the detection pattern unit 22, an alternating repeating pattern of the reflective surface 20 and the non-reflective surface 21 is formed over the entire circumference of the rotation direction R.

In this example, the focus operation ring 2f is made of a metal having a high light reflectance such as aluminum, and the inner peripheral surface 2fa is a metal surface. Further, on the inner peripheral surface 2fa of the focus operation ring 2f, non-reflective carriers 7 made of a resin material having a low light reflectance such as black resin are arranged at predetermined intervals along the rotation direction R. These non-reflective carriers 7 are formed in a film shape by, for example, printing.

In the detection pattern portion 22, the non-reflective surface 21 is formed as an inner surface of the non-reflective carrier 7. The inner surface is a surface facing the optical axis Axo side.
Further, the reflective surface 20 is formed as a part of the inner peripheral surface 2fa of the focus operation ring 2f. That is, the non-arranged portions of the non-reflective carrier 7 on the inner peripheral surface 2fa, which is a metal surface, each function as the reflective surface 20.

The focus operation ring 2f does not have to be made of metal, and it is sufficient that the light reflectance of the inner peripheral surface 2fa is enhanced by, for example, metal plating or a light reflecting sheet being applied to the inner peripheral surface 2fa.

As described above, each reflective surface 20 is formed as a part of the inner peripheral surface 2fa of the focus operation ring 2f, and each non-reflective surface 21 is formed as an inner surface of the non-reflective carrier 7 formed on the inner peripheral surface 2fa. There is. Therefore, the detection pattern unit 22 moves in the rotation direction R as the focus operation ring 2f rotates.

In the detection pattern portion 22, the formation pitch of the reflective surface 20 and the non-reflective surface 21 is set to a constant pitch. That is, as shown in the schematic diagram of FIG. 4, in the detection pattern unit 22, the width w20 in the rotation direction R of each reflective surface 20 and the width w21 in the rotation direction R of each non-reflective surface 21 coincide with each other.
In this example, the width w20 and the width w21 are set to 0.3 mm or less. As a result, it has been confirmed that sufficient detection resolution can be obtained in actual use.

In FIG. 3, a wiring board 8 as a flexible substrate is fixed at a predetermined position on the outer peripheral surface 6a of the fixing member 6, and a pattern of a reflective surface 20 and a non-reflective surface 21 is fixed on the outer peripheral surface of the wiring board 8. A detection unit 9 for detecting the rotation amount and the rotation direction of the focus operation ring 2f is arranged based on the above.

FIG. 5 is a schematic perspective view of the detection unit 9 as viewed from the focus operation ring 2f side. Note that FIG. 5 also shows a part of the wiring board 8.
The detection unit 9 includes a light emitting element 10, a first light receiving element 11, a second light receiving element 12, a substrate 13, and a covering unit 14. The light emitting element 10 has a light emitting surface 10a that emits light, and the light emitting surface 10a is arranged on the wiring board 8 in a direction facing the detection pattern portion 22.

Both the first light receiving element 11 and the second light receiving element 12 are arranged on the substrate 13, and the light receiving surface 11a of the first light receiving element 11 and the light receiving surface 12a of the second light receiving element 12 face the detection pattern portion 22 of the substrate 13. It is arranged on the wiring board 8 depending on the direction in which it is used. The wiring board 8 corresponds to the "first board", and the board 13 corresponds to the "second board".
In this example, the first light receiving element 11 and the second light receiving element 12 are arranged on the substrate 13 by a single semiconductor manufacturing process.

The covering portion 14 projects from the wiring board 8 in the thickness direction thereof, and is formed as a portion that covers the periphery of the light emitting element 10, the first light receiving element 11, and the second light receiving element 12. The covering portion 14 prevents unintended light such as external light from leaking into the first light receiving element 11 and the second light receiving element 12. Further, it is possible to prevent foreign matter such as dust from adhering to the light emitting surface 10a, the light receiving surface 11a, and the light receiving surface 12a.
Therefore, it is possible to improve the detection accuracy of the rotation amount and the rotation direction.

FIG. 6 schematically shows the positional relationship between the detection unit 9 and the detection pattern unit 22. Note that FIG. 6 shows the positional relationship between the detection unit 9 and the detection pattern unit 22 as viewed from the optical axis Axo side, and the detection unit 9 is shown in a fluoroscopic state.
As shown in FIG. 6, the light emitting element 10, the first light receiving element 11, and the second light receiving element 12 in the detection unit 9 are positioned so as to face the detection pattern unit 22.

Here, the direction indicated by the double-headed arrow “X” in FIG. 6 is the direction in which the reflective surface 20 and the non-reflective surface 21 in the detection pattern unit 22 are aligned, and will be hereinafter referred to as “arrangement direction X”. The alignment direction X can be rephrased as a direction parallel to the tangential direction of the rotation direction R.
The alignment direction X is a direction corresponding to the rotation direction R, but in the following, the "rotation direction R" is used for the focus operation ring 2f, and the "arrangement direction X" is used properly for the patterns of the reflective surface 20 and the non-reflective surface 21.

Further, the direction indicated by the double-headed arrow “Y” in FIG. 6 is the axial direction of the rotation axis of the focus operation ring 2f. The direction indicated by "Y" is a direction orthogonal to the arrangement direction X, and is hereinafter referred to as "pattern orthogonal direction Y".

FIG. 7 is a front view of the detection unit 9, and FIG. 8 is a diagram schematically showing how the detection pattern unit 22 and the light emitting surface 10a, the light receiving surface 11a, and the light receiving surface 12a face each other. In FIG. 7, the cover portion 14 is not shown.
As shown in FIG. 7, the center of the light emitting surface 10a is referred to as the center c0, the center of the light receiving surface 11a is referred to as the center c1, and the center of the light receiving surface 12a is referred to as the center c2. In the detection unit 9, the center c0 is located between the center c1 and the center c2 in the arrangement direction X. In this example, the center c0 is located at the midpoint between the center c1 and the center c2 in the arrangement direction X.

As shown by the solid arrow in FIG. 8, the light emitting element 10 emits divergent light from the light emitting surface 10a to the detection pattern portion 22.
In FIG. 8, the light reflected from the reflecting surface 20 is represented by a broken line arrow. From FIG. 8, the light emitted from one light emitting element 10 due to the arrangement of the center c0, the center c1, and the center c2 as described above. Can be seen to be guided to the light receiving surface 11a and the light receiving surface 12a, respectively, via the reflecting surface 20. That is, only one light emitting element 10 should be provided when the first light receiving element 11 and the second light receiving element 12 receive the reflected light from the reflecting surface 20.

Further, the detection unit 9 has the following characteristics regarding the arrangement relationship of the light emitting element 10, the first light receiving element 11, and the second light receiving element 12. That is, in FIG. 7, when the arrangement range of the light emitting elements 10 in the arrangement direction X is “rx”, at least a part of the first light receiving element 11 and at least a part of the second light receiving element 12 within the arrangement range rx. Is located. FIG. 7 shows an example in which only a part of each of the first light receiving element 11 and the second light receiving element 12 is located within the arrangement range rx.

As a result, the separation distance between the first light receiving element 11 and the second light receiving element 12 in the arrangement direction X is shortened, and the size of the detection unit 9 can be reduced in the arrangement direction.

Here, by arranging the center c1 and the center c2 so as to be separated from each other in the direction X, a phase difference is generated between the output signal waveform (light receiving signal waveform) of the first light receiving element 11 and the output signal waveform of the second light receiving element 12. Can be caused. Hereinafter, the light receiving signal by the first light receiving element 11 is referred to as an “A phase signal”, and the light receiving signal by the second light receiving element 12 is referred to as a “B phase signal”.

The first light receiving element 11 and the second light receiving element 12 are arranged apart from each other in the alignment direction X so that the phase difference between the A phase signal and the B phase signal is approximately 90 degrees.
In this example, in the first light receiving element 11 and the second light receiving element 12, the separation distance D in the alignment direction X (or rotation direction R) of the center c1 and the center c2 is 1.5 times the width w20 and the width w21. They are arranged so as to be separated from each other in the direction X (see FIG. 6).

FIG. 9 shows the waveforms (after I / V conversion) of the A-phase signal and the B-phase signal having a phase difference of 90 degrees.
The A-phase signal and the B-phase signal are substantially sinusoidal signals because the reflective surface 20 and the non-reflective surface 21 are formed at a constant pitch in the detection pattern unit 22.

[1-2. Configuration of the entire optical element drive system]

The configuration of the entire optical element drive system in the lens device 1 will be described with reference to the block diagram of FIG.
The lens device 1 includes a drive circuit 50, an I / V conversion unit 51, an A / D conversion unit 52, an arithmetic circuit 53, a drive circuit 54, and an actuator 55, in addition to the respective units described so far. Here, the optical element 56 in the figure is an optical element to be driven at the time of focus adjustment, and in this example, the movable focus lens described above corresponds to this.

The drive circuit 50 drives the light emitting element 10 to emit light. The I / V conversion unit 51 performs I / V conversion of the currents output by the first light receiving element 11 and the second light receiving element 12 according to the amount of received light, and the A phase signal and the B phase whose signal strength is expressed by the voltage. Get a signal. The A / D conversion unit 52 digitally samples the A-phase signal and the B-phase signal obtained by the I / V conversion unit 51 and converts them into digital values having predetermined gradations.

The arithmetic circuit 53 performs arithmetic processing for obtaining the rotation direction and rotation amount of the focus operation ring 2f based on the A-phase signal and the B-phase signal converted into digital values by the A / D conversion unit 52, and the rotation direction and rotation amount thereof. An arithmetic process for obtaining the drive amount of the actuator 55 is performed based on the above, and a value indicating the drive amount is instructed to the drive circuit 54.

The drive circuit 54 drives the actuator 55 based on the value instructed by the arithmetic circuit 53. As a result, the optical element 56 is moved according to the rotation operation of the focus operation ring 2f, and the focus adjustment is realized.

[1-3. Contrast with conventional]

In the conventional direct reading method, since two photoreflectors are mounted individually, an error is likely to occur in the positional relationship between the photoreflectors, and due to the error, the phase difference of the output waveform from each photoreflector is different for each product. There was a tendency for variations to occur.

It will be described with reference to the waveform diagram of FIG. 11 that such variation in the phase difference hinders the narrowing of the formation pitch of the reflective surface 20 and the non-reflective surface 21. Here, the phase of the output waveform from one photoreflector is referred to as phase A, and the phase of the output waveform from the other photoreflector is referred to as phase B. In FIG. 11, the output waveform is simply represented by a rectangular wave.

The upper part of FIG. 11 shows an output waveform when the formation pitch of the reflective surface 20 and the non-reflective surface 21 is a wide pitch (hereinafter referred to as “pitch S”). Regarding the B phase in the figure, the upper waveform represents a waveform when there is no phase difference error with respect to the A phase, and the lower waveform represents a waveform when there is a phase difference error with respect to the A phase. Assuming that one cycle of the output waveform in this case is T0 [s], the difference between the phase angles of 90 degrees between the A phase and the B phase is expressed as T0 [s] / 4.

When an error occurs in the arrangement position of the two photo reflectors, the phase angle variation represented by a0 [s] in the figure is added to the output waveform. At this time, the phase angle variation a0 [s] must satisfy the condition of the following [Equation 1].
a0 [s] <T0 [s] / 4 ... [Equation 1]
This is because if a0 [s] = T0 [s] / 4, the phases of the A phase and the B phase are aligned and the rotation direction of the operation ring cannot be detected, and a0 [s]> T0 [s] /. If it is 4, the phase of the B phase advances with respect to the phase of the A phase, so that it is erroneously recognized that the rotation direction of the operation ring is reversed.

The lower part of FIG. 11 shows an output waveform when the formation pitch of the reflective surface 20 and the non-reflective surface 21 is narrowed to n times the above-mentioned pitch S (however, 0 <n <1). In this case, one cycle T1 of the output waveform and the phase angle variation a1 [s] can be expressed by the following [Equation 2] and [Equation 3].
T1 [s] = n * T0 [s] ... [Expression 2]
a1 [s] = a0 [s] / n ... [Equation 3]
Further, the difference between the phase angles of 90 degrees between the A phase and the B phase in this case can be expressed as T1 [s] / 4.

When the formation pitch of the reflective surface 20 and the non-reflective surface 21 is narrowed by n times, the phase angle variation a1 [s] must satisfy the condition of the following [Equation 4].
a1 [s] <T1 [s] / 4 ... [Equation 4]
Here, from the above [Equation 2] and [Equation 3], [Equation 4] can be converted as follows.
a0 [s] / n <n * T0 [s] / 4 ... [Equation 5]

Therefore, for n, the inequality of the following [Equation 6] holds.
n> sqrt (4 * a0 [s] / T0 [s]) ... [Expression 6]
That is, n cannot be smaller than the constant value sqrt (4 * a0 [s] / T0 [s]), and there is a limit to narrowing the formation pitch of the reflective surface 20 and the non-reflective surface 21.

On the other hand, in the lens device 1, the first light receiving element 11 and the second light receiving element 12 are formed on the same substrate 13 as described above. As a result, the positional relationship between the first light receiving element 11 and the second light receiving element 12 is determined with high accuracy, and the tolerance for narrowing the pitch of the detection pattern by the reflective surface 20 and the non-reflective surface 21 is increased.
Therefore, it is possible to improve the detection resolution of the rotation amount of the focus operation ring 2f.

[1-4. Modification example related to the arrangement of the light emitting element and the light receiving element]

Various modifications can be considered for the arrangement positions of the light emitting element 10, the first light receiving element 11, and the second light receiving element 12.
12, 13, and 14 are front views of the detection unit 9A as the first modification, the detection unit 9B as the second modification, and the detection unit 9C as the third modification, respectively. As in FIG. 7, the covering portion 14 is not shown in FIGS. 12 to 14.

In the following description, the same parts as those already described will be designated by the same reference numerals and the description thereof will be omitted.

The detection unit 9A shown in FIG. 12 has a center c0 located between the center c1 and the center c2 in the arrangement direction X in the same manner as the detection unit 9, but the detection unit 9A is a light emitting element 10 in the pattern orthogonal direction Y. It differs from the detection unit 9 in that at least a part of the first light receiving element 11 and at least a part of the second light receiving element 12 are located in the arrangement range ry. FIG. 12 shows an example in which all of the first light receiving element 11 and all of the second light receiving element 12 are located within the arrangement range ry.

Since at least a part of each of the first light receiving element 11 and the second light receiving element 12 is located within the arrangement range ry, the separation distance between the first light receiving element 11 and the second light receiving element 12 in the pattern orthogonal direction Y is short. The size of the detection unit 9A is reduced in the pattern orthogonal direction Y. Further, if all of the first light receiving element 11 and the second light receiving element 12 are located within the arrangement range ry, the size can be further reduced in the pattern orthogonal direction Y.

The detection unit 9B shown in FIG. 13 differs from the detection unit 9 in that all of the first light receiving element 11 and all of the second light receiving element 12 are located within the coordination range rx of the light emitting element 10 in the arrangement direction X. ..
As a result, the separation distance between the first light receiving element 11 and the second light receiving element in the arrangement direction X is further shortened as compared with the detection unit 9, and the size of the detection unit 9B can be further reduced in the arrangement direction X.

In the detection unit 9C shown in FIG. 14, the center c0 is not located between the center c1 and the center c2 in the arrangement direction X, but is arranged in the order of the center c0, the center c2, and the center c1.
In this case, the optical axis of the light emitted by the light emitting element 10 is tilted to the side where the first light receiving element 11 and the second light receiving element 12 are arranged, so that the first light receiving element 11 and the second light receiving element 12 respectively. The reflected light from the reflecting surface 20 is received.
The arrangement of the center c may be the center c2, the center c1, and the center c0 in addition to the arrangement of the center c0, the center c2, and the center c1 as shown in FIG.

FIG. 15 is a schematic perspective view of the detection unit 9D as a fourth modification as seen from the outer peripheral side of the focus operation ring 2f.
In this case, the wiring board 8 is not used, but the wiring board 8u and the wiring board 8d are used instead. In the detection unit 9D, the light emitting element 10 is formed on the wiring board 8u, and the first light receiving element 11 and the second light receiving element 12 are formed on the wiring board 8d, respectively.
By arranging the light emitting element 10, the first light receiving element 11 and the second light receiving element 12 on separate substrates in this way, the light emitting element 10, the first light receiving element 11, and the second light receiving element 12 are placed on the substrate. Even after the arrangement, the positional relationship between the light emitting element 10 and the first light receiving element 11 and the second light receiving element 12 can be adjusted.

<2. Second embodiment>

Subsequently, the lens device 1A as the second embodiment will be described.
In each of the following embodiments, only the parts different from the lens device 1 will be mainly described, and the other parts will be the same as those of the lens device 1, so the description thereof will be omitted.

FIG. 16 is a schematic perspective view showing an enlarged main part of the lens device 1A, and shows an enlarged portion of the detection pattern portion 22A of the lens device 1A in the same manner as in FIG. 3 above.
The difference from the lens device 1 is that a protruding non-reflective carrier 7A is formed instead of the film-shaped non-reflective carrier 7. The non-reflective carrier 7A is made of, for example, a black resin, has a substantially square columnar shape, and projects toward the inner peripheral side of the focus operation ring 2f. The inner peripheral surface of each of the non-reflective carriers 7A functions as a non-reflective surface 21A. That is, the non-reflective surface 21A is formed as an inner surface of the non-reflective carrier 7A.
In this case, the reflective surface 20 and the non-reflective surface 21A are alternately arranged in the rotation direction R, and the detection pattern portion 22A is configured as an alternating arrangement portion of the reflective surface 20 and the non-reflective surface 21A.

With the lens device 1A as described above, it is not necessary to form the non-reflective carrier 7A in a film shape, and the non-reflective surface 21A can be formed even under the circumstances that the non-reflective carrier 7A cannot be formed in a film shape by printing or the like. can.

In the above, the example in which the reflection surface 20 is formed on the inner peripheral surface 2fa by making the focus operation ring 2f made of metal as in the case of the lens device 1, but the focus operation ring 2f is made of resin. , The non-reflective carrier 7A can also be integrally formed with the focus operation ring 2f. In this case, the reflective surface 20 can be realized by forming a reflective material such as metal on the inner peripheral surface 2fa by coating or the like.

Further, when the light reflectance of the inner peripheral surface 2fa is high, such as when the inner peripheral surface 2fa is a metal surface, a protruding reflective carrier is placed on the inner peripheral surface 2fa instead of the non-reflective carrier 7A. It can also be formed. In this case, the reflective carrier may have at least a high light reflectance on the inner peripheral surface.

<3. Third Embodiment>

FIG. 17 is a schematic perspective view showing an enlarged main part of the lens device 1B as the third embodiment, and the formed portion of the detection pattern portion 22B in the lens device 1B is enlarged in the same manner as in FIG. Represents.
In the lens device 1B, instead of the metal focus operation ring 2f, a resin focus operation ring 2fA made of, for example, a black resin is provided. The focus operation ring 2fA does not have to be made of resin, and it is sufficient that the light reflectance of the inner peripheral surface 2fa is lowered, for example, the inner peripheral surface 2fa is matted.

Reflective carriers 15 made of a metal having a high light reflectance, such as aluminum, are formed on the inner peripheral surface 2fa of the focus operation ring 2fA at predetermined intervals along the rotation direction R. These reflective carriers 15 are formed in a film shape by, for example, printing, and the inner surface of the reflective carrier 15 functions as the reflective surface 20A. That is, the reflective surface 20A is formed as the inner surface of the reflective carrier 15.

Further, on the inner peripheral surface 2fa of the focus operation ring 2fA, the non-arranged portion of the reflective carrier 15 functions as the non-reflective surface 21B, and therefore the non-reflective surface 21B is formed as a part of the inner peripheral surface 2fa of the focus operation ring 2fA. Has been done.

In this case, the reflective surface 20A and the non-reflective surface 21B are alternately arranged in the rotation direction R, and the detection pattern portion 22B is configured as an alternating arrangement portion of the reflective surface 20A and the non-reflective surface 21B.

In the lens device 1B, the non-reflective surface 21B is formed as a part of the inner peripheral surface 2fa as described above, so that the focus operation ring 2fA can be formed of a general-purpose resin.
Therefore, cost reduction can be achieved.

Further, in the lens device 1B, the reflective carrier 15 is formed in a film shape.
As a result, the amount of protrusion of the reflective carrier 15 is suppressed in the radial direction of the lens device 1B, and the space to be secured between the detection unit 9 and the detection pattern unit 22B can be reduced.

<4. Fourth Embodiment>

FIG. 18 is a schematic perspective view showing an enlarged main part of the lens device 1C as the fourth embodiment, and the formed portion of the detection pattern portion 22C in the lens device 1C is enlarged in the same manner as in FIG. Represents.
In the lens device 1C, the focus operation ring 2fA is used as in the case of the third embodiment, and a ring-shaped member 16 that rotates integrally with the focus operation ring 2fA is provided on the inner peripheral side of the focus operation ring 2fA. ..

The ring-shaped member 16 is made of a transparent material such as a transparent resin, and the outer peripheral surface 16b is fixed to the inner peripheral surface 2fa of the focus operation ring 2fA. Reflective carriers 15 are arranged at predetermined intervals along the rotation direction R on the inner peripheral surface 16a of the ring-shaped member 16. The reflective carrier 15 is formed on the inner peripheral surface 16a in the form of a film by, for example, printing.
The inner surface of each of the reflective carriers 15 formed on the inner peripheral surface 16a of the ring-shaped member 16 functions as the reflective surface 20B, respectively.

Here, since the ring-shaped member 16 is transparent, the portion where the reflective carrier 15 is not arranged in the rotation direction R transmits light. That is, the light emitted from the light emitting element 10 can pass through the portion and reach the inner peripheral surface 2fa of the focus operation ring 2fA. At this time, the inner peripheral surface 2fa of the focus operation ring 2fA has a low light reflectance and functions as a non-reflective surface 21B. Therefore, in the rotation direction R, the reflective surface 20B and the non-reflective surface 21B are alternately arranged.

The detection pattern portion 22C is a portion in which the reflective surface 20B formed on the inner surface of the reflective carrier 15 and the non-reflective surface 21B formed as a part of the inner peripheral surface 2fa are alternately arranged in the rotation direction R. It is configured as.

According to the lens device 1C as described above, it is not necessary to form the reflective carrier 15 on the focus operation ring 2fA. Therefore, even if the pattern formation of the reflective carrier 15 fails, the ring-shaped member 16 may be discarded, and the focus operation ring may be discarded. It is not necessary to dispose of 2fA, and the yield can be improved.
Further, since the non-reflective surface 21B is formed as a part of the inner peripheral surface 2fa, the focus operation ring 2fA can be formed of a general-purpose resin. Therefore, cost reduction can be achieved.

Further, in the lens device 1C, the reflective carrier 15 is formed on the inner peripheral surface 16a of the ring-shaped member 16, which is more than the case where the reflective carrier 15 is formed on the outer peripheral surface 16b of the ring-shaped member 16. It is also possible to reduce the amount of reflective carrier material used.
Therefore, cost reduction can be achieved. Further, by setting the forming position of the reflective carrier 15 on the inner peripheral surface 16a of the ring-shaped member 16, it becomes easy to form the reflective carrier 15 on the ring-shaped member 16 by tampo printing (pad printing).

In the above, the example of forming the reflective carrier 15 on the transparent ring-shaped member 16 by printing or the like has been given, but the reflective carrier 15 can also be formed as a part of the ring-shaped member 16. For example, the ring-shaped member 16 is formed as a member in which metal portions and transparent portions are alternately positioned along the rotation direction R. As described above, the ring-shaped member 16 does not necessarily have to be entirely transparent, and at least the non-positional portion of the reflective carrier 15 in the rotation direction R may be transparent.

Here, the reflective carrier 15 can also be formed on the outer peripheral surface 16b of the ring-shaped member 16.
Further, when the reflective carrier 15 is formed on the inner peripheral surface 16a, the non-reflective carrier can also be formed on the outer peripheral surface 16b. At this time, the non-reflective carrier can be formed only at a position corresponding to the non-arranged portion of the reflective carrier 15 in the rotation direction R, or can be formed over the entire circumference of the outer peripheral surface 16b. By forming the non-reflective carrier on the outer peripheral surface 16b, it is not necessary to lower the light reflectance of the inner peripheral surface 2fa, and the degree of freedom in selecting the material of the operation ring can be increased.

<5. Fifth Embodiment>

FIG. 19 is a schematic perspective view showing an enlarged main part of the lens device 1D as the fifth embodiment, and the formed portion of the detection pattern portion 22D in the lens device 1D is enlarged in the same manner as in FIG. Represents.
The fifth embodiment reverses the positional relationship between the reflective surface and the non-reflective surface from the case of the fourth embodiment.

In the lens device 1D, the focus operation ring 2f is used as in the case of the first embodiment, the ring-shaped member 16 is provided on the inner peripheral side of the focus operation ring 2f, and the outer peripheral surface 16b of the ring-shaped member 16 is focused. It is fixed to the inner peripheral surface 2fa of the operation ring 2f.
In this case, the non-reflective carriers 7 are arranged at predetermined intervals along the rotation direction R on the inner peripheral surface 16a of the ring-shaped member 16. The non-reflective carrier 7 is formed on the inner peripheral surface 16a in the form of a film by, for example, printing. The inner surface of each non-reflective carrier 7 functions as a non-reflective surface 21C.

Further, in this case, the inner peripheral surface 2fa of the focus operation ring 2f functions as the reflecting surface 20 as in the case of the first embodiment. Therefore, in the rotation direction R, the reflective surface 20 and the non-reflective surface 21C are alternately arranged.
The detection pattern unit 22D is configured as a portion in which the reflective surface 20 and the non-reflective surface 21C are alternately arranged in the rotation direction R in this way.

According to the lens device 1D as described above, it is not necessary to form the non-reflective carrier 7 on the focus operation ring 2f. Therefore, even if the pattern formation of the non-reflective carrier 7 fails, the ring-shaped member 16 may be discarded and the focus may be obtained. It is not necessary to dispose of the operation ring 2f, and the yield can be improved.
Further, since the non-reflective carrier 7 is formed on the inner peripheral surface 16a of the ring-shaped member 16, the non-reflective carrier material is more than the case where the non-reflective carrier 7 is formed on the outer peripheral surface 16b of the ring-shaped member 16. It is possible to reduce the amount used. Therefore, cost reduction can be achieved.
Further, by setting the formation position of the non-reflective carrier 7 on the inner peripheral surface 16a of the ring-shaped member 16, it becomes easy to form the non-reflective carrier 7 on the ring-shaped member 16 by tampo printing.

In the fifth embodiment, the non-reflective carrier 7 can also be formed as a part of the ring-shaped member 16. That is, even in the fifth embodiment, it is not always necessary that the entire ring-shaped member 16 is transparent, and at least the non-positional portion of the non-reflective carrier 7 in the rotation direction R may be transparent.

Further, the non-reflective carrier 7 may be formed on the outer peripheral surface 16b of the ring-shaped member 16.
Further, when the non-reflective carrier 7 is formed on the inner peripheral surface 16a, the reflective carrier can also be formed on the outer peripheral surface 16b. At this time, the reflective carrier can be formed only at a position corresponding to the non-arranged portion of the non-reflective carrier 7 in the rotation direction R, or can be formed over the entire circumference of the outer peripheral surface 16b. As a result, it is not necessary to increase the light reflectance of the inner peripheral surface 2fa, and the degree of freedom in selecting the material of the operation ring can be increased. Especially in this case, since a general-purpose resin material can be selected, cost reduction can be achieved.

<6. About rotation amount calculation method ＞

Subsequently, a rotation amount calculation method by the calculation circuit 53 based on the A-phase signal and the B-phase signal will be described.
First, a method of calculating the amount of rotation based on the Lissajous circle will be described with reference to FIG.
In a state where the focus operation ring 2f is continuously rotated in either the forward or reverse rotation direction, the horizontal axis is the value α of the A phase signal and the vertical axis is the value β of the B phase signal. When the time coordinates p (α, β) are plotted, a Lisaju circle as shown in FIG. 20A is drawn. The Lissajous circle is a perfect circle in an ideal state where the phase difference between the A-phase signal and the B-phase signal is 90 degrees.

Here, the coordinates of the current values of the values α and β are expressed as the current value coordinates p [t]. FIG. 20B shows the waveforms of the A-phase signal and the B-phase signal having a phase difference of 90 degrees. For example, when the phase of the A-phase signal advances relatively as shown in FIG. 20B during normal rotation. The current value coordinate p [t] moves counterclockwise on the Lissajous circle during forward rotation and clockwise on the Lissajous circle during reverse rotation (in FIG. 20A). See arrow).
The determination of forward rotation / reverse rotation is performed by determining which phase of the A-phase signal or the B-phase signal is relatively advanced.

In the rotation amount calculation based on the Lissajous circle, a plurality of reference coordinates p'are set at predetermined intervals on the Lissajous circle. FIG. 20A shows an example in which eight p'0 to p'7 are set as the reference coordinates p'. FIG. 20B shows the relationship between these reference coordinates p'0 to p'7 and the A-phase signal and the B-phase signal. For example, it can be seen that the reference coordinates p'0 (α0, β0) correspond to the time when the value α of the A phase signal becomes the maximum value and the value β of the B phase signal becomes zero.

In the rotation amount calculation in this case, for example, every time the current value coordinate p [t] moving on the Lissajous circle passes the reference coordinate p', a constant value is added to the current value of the rotation amount. That is, each time the rotation operation amount of the focus operation ring 2f increases by a certain amount, the current value of the rotation amount increases by a certain value (smaller in the case of reverse rotation).

Whether or not the current value coordinate p [t] has passed the target reference coordinate p'of the reference coordinates p'0 to p'7 is determined by, for example, the α value and β represented by the target reference coordinate p'. Judgment is made based on the magnitude relationship between the value (for example, α0 and β0 if the reference coordinate is p'0) and the current value α and the value β. As an example, when the reference coordinate p'3 is targeted at the time of forward rotation, it is determined whether or not the condition by "α ≦ α3 and β ≦ β3" is satisfied for the current value α and the value β. do. Alternatively, when the reference coordinate p'0 is targeted at the time of reverse rotation, it is determined whether or not the condition by "α ≦ α0 and β ≦ β0" is satisfied.

In the rotation amount calculation based on the Lissajous circle, the detection resolution of the rotation amount can be increased as the number of the reference coordinates p'set on the Lissajous circle is increased. Therefore, the detection resolution can be improved as compared with the method of performing the rotation amount calculation based only on the zero cross point of the A phase signal and the B phase signal (hereinafter referred to as “simple method”). For example, when eight reference coordinates p'are set as shown in FIG. 20A, the resolution can be improved to twice that of the simple method.

The above-mentioned method for calculating the amount of rotation based on the Lissajous circle can be rephrased as a method for calculating the amount of rotation using a plurality of reference coordinates set on the Lissajous circle as threshold values for the A-phase signal and the B-phase signal. At this time, by setting the reference coordinate p'at least to 5 or more, it is possible to improve the rotation amount detection resolution as compared with the simple method.

The rotation amount calculation method based on the Lissajous circle is a method of calculating the rotation amount based on the A-phase signal, the B-phase signal, and a plurality of threshold values set for each of the A-phase signal and the B-phase signal. In other words.

Here, when the phase difference between the A-phase signal and the B-phase signal deviates from 90 degrees, the movement locus of the current value coordinates p [t] on the coordinate space shown in FIG. 20A does not draw a perfect circle. That is, the roundness is reduced. In the rotation amount calculation based on the Lissajous circle, when the roundness of the movement locus decreases, it becomes difficult to accurately obtain the rotation amount, and it becomes difficult to increase the number of setting of the reference threshold value p'.
In the lens device as each of the above-described embodiments, the positional accuracy of the first light receiving element 11 and the second light receiving element 12 is improved, so that the movement locus of the current value coordinates p [t] approaches a perfect circle. Therefore, a larger reference threshold value p'can be set, and the detection resolution of the rotation amount can be improved.

Subsequently, the rotation amount calculation by the cross point method will be described with reference to FIG.
In the cross-point method, thresholds Th1 to Th5 as shown in the figure are set as thresholds for the A-phase signal and the B-phase signal. The threshold value Th1 and the threshold value Th5 are set to the cross-point values of the A-phase signal and the B-phase signal immediately after the A-phase signal reaches the maximum value and immediately after the minimum value, respectively, and the threshold value Th3 is set to zero. ing. The threshold value Th2 and the threshold value Th4 are set to an intermediate value between the threshold value Th1 and the threshold value Th3, and an intermediate value between the threshold value Th5 and the threshold value Th3, respectively.

In the cross-point method, during forward / reverse rotation, the current value of the corresponding signal among the A-phase signal and the B-phase signal and the corresponding threshold value Th are determined by the order represented by the arrows (1) to (4) in the figure. Will be compared in order. Specifically, first, according to the arrow (1), for example, when the current value α [t] of the A phase signal reaches the maximum value, whether or not the current value α [t] is equal to or less than the threshold value Th1 is determined. judge. When the current value α [t] becomes the threshold value Th1 or less, it is determined whether or not the current value α [t] is the threshold value Th2 or less, and when the current value α [t] becomes the threshold value Th2 or less, the current value α [t] is the threshold value Th3 or less. Determine if it exists. After that, when the current value α [t] becomes the threshold value Th5 or less, it is determined whether or not the current value β [t] of the B phase signal is the threshold value Th2 or less according to the arrow (2).
In this way, whether or not the current value of the corresponding signal among the A-phase signal and the B-phase signal has passed the corresponding point among the threshold points represented by the black circles in the figure according to the order indicated by the arrows (1) to (4). It is judged in order. Then, each time the passage of the threshold point is determined, a constant value is added to the current value of the rotation amount. As a result, each time the rotation amount of the focus operation ring 2f increases by a certain amount, the value of the rotation amount changes by a constant value. That is, a value corresponding to the amount of rotation of the focus operation ring 2f is calculated.
In the cross point method, the detection resolution of the rotation amount can be improved as the number of threshold values Th is increased.

As the cross-point method as described above, a plurality of A-phase signals, B-phase signals, A-phase signals, and B-phase signals are set in the same manner as in the rotation amount calculation method based on the Lisaju circle. In other words, it is a method of calculating the amount of rotation based on the threshold value.

<7. Summary of embodiments>

As described above, the lens device (1A, 1B, 1C, or 1D) as an embodiment includes a rotation-operated operation ring (2f or 2fA), a light emitting element (10) that emits light, and a plurality of light receiving elements (1A, 1B, 1C, or 1D). A reflective surface (20, 20A, or 20B) and a non-reflective surface (21, 21A, 21B, or 21C) that are provided with 11 and 12) and are alternately arranged in the rotation direction of the operation ring and move with the rotation of the operation ring. A detection pattern unit (22, 22A, 22B, 22C, or 22D) having the above is provided, the light emitting element emits light to the detection pattern unit, and a plurality of light receiving elements are arranged on the same substrate (13). Receives the reflected light from the reflecting surface.

By arranging a plurality of light receiving elements on the same substrate, the positional relationship between the light receiving elements is determined with high accuracy, and the tolerance for narrowing the pitch of the detection pattern by the reflective surface and the non-reflective surface is increased.
Further, since the direct reading method is adopted, the cam ring used in the mechanical drive method can be omitted.
Therefore, it is possible to improve the detection resolution of the operation ring rotation amount while suppressing the increase in size of the lens device.

Further, for the mechanical drive method, the cam ring can be omitted, so that the lens device can be miniaturized and the optical element to be operated can be moved at high speed.
The speed-increasing method has an advantage that the above-mentioned problem of hysteresis can be solved and that the size of the lens can be suppressed even if it is applied to a collapsible lens device.

Further, in the lens device as an embodiment, the light receiving elements of the plurality of light receiving elements are arranged so that the light receiving surface faces the reflecting surface.

As a result, the reflected light is efficiently received by the light receiving element. Therefore, the detection accuracy of the rotation amount and the rotation direction of the operation ring can be improved.

Further, in the lens device as an embodiment, two light receiving elements, a first light receiving element and a second light receiving element, are provided as light receiving elements, and the center of the light emitting surface of the light emitting element is the first in the arrangement direction in which the reflective surface and the non-reflective surface are lined up. It is located between the center of the light receiving surface of one light receiving element and the center of the light receiving surface of the second light receiving element.

This facilitates the number of light emitting elements to be provided when each of the two light receiving elements receives the reflected light from the reflecting surface.
Therefore, it is possible to facilitate the reduction of the number of parts.

Furthermore, in the lens device as an embodiment, at least a part of the first light receiving element and at least a part of the second light receiving element are positioned within the arrangement range of the light emitting elements in the arrangement direction.

As a result, the separation distance between the two light receiving elements in the alignment direction is shortened.
Therefore, the size of the detection unit including at least two light receiving elements and the light emitting element can be reduced in the arrangement direction.

Further, in the lens device as an embodiment, all of the first light receiving elements and all of the second light receiving elements are located within the arrangement range of the light emitting elements in the arrangement direction.

As a result, the separation distance between the two light receiving elements in the alignment direction is further shortened.
Therefore, the size of the detection unit including at least two light receiving elements and the light emitting element can be further reduced in the arrangement direction.

Further, in the lens device as an embodiment, at least a part of the first light receiving element and at least a part of the second light receiving element within the arrangement range of the light emitting element in the pattern orthogonal direction which is the axial direction of the rotation axis of the operation ring. Is located.

As a result, the separation distance between the two light receiving elements in the direction orthogonal to the pattern is shortened.
Therefore, the size of the detection unit including at least two light receiving elements and the light emitting element can be reduced in the direction orthogonal to the pattern.

Furthermore, in the lens device of the embodiment, all of the first light receiving elements and all of the second light receiving elements are located within the arrangement range of the light emitting elements in the direction orthogonal to the pattern.

As a result, the separation distance between the two light receiving elements in the direction orthogonal to the pattern is further shortened.
Therefore, the size of the detection unit including at least two light receiving elements and the light emitting element can be further reduced in the direction orthogonal to the pattern.

Further, in the lens device as an embodiment, a second substrate (13), which is a substrate on which a first substrate (8) on which a light emitting element is arranged and a plurality of light receiving elements are arranged, is provided on the first substrate. Have been placed.

As a result, not only the positional relationship between the light receiving elements but also the positional relationship between the light receiving element and the light emitting element can be determined with high accuracy.
Therefore, it is possible to improve the detection accuracy of the rotation amount.

Further, in the lens device as an embodiment, the widths of the reflective surface and the non-reflective surface in the line-up direction of the reflective surface and the non-reflective surface are set to 0.3 mm or less, respectively.

As a result, sufficient detection resolution can be obtained in actual use.
Therefore, it is possible to sufficiently secure the accuracy of various adjustments using the operation ring such as focus adjustment.

Furthermore, in the lens apparatus as an embodiment, the reflective surface is formed as a part of the inner peripheral surface of the operation ring, and the non-reflective surface is a non-reflective carrier (7 or 7A) formed on the inner peripheral surface of the operation ring. ) (See first or second embodiment).

Since the reflective surface is formed as a part of the inner peripheral surface of the operation ring, the reflective surface is formed as a part of, for example, the inner peripheral surface of the operation ring made of metal or the inner peripheral surface of the operation ring plated with metal. This makes it possible to enhance the deterrent against aging or breakage of the reflective surface as compared with the case where the reflective surface is formed by printing.
Therefore, it is possible to suppress a decrease in detection accuracy with time regarding the amount of rotation and the direction of rotation of the operation ring.

Further, in the lens device as an embodiment, the non-reflective carrier is formed in a film shape.

As a result, the amount of protrusion of the non-reflective carrier is suppressed in the radial direction of the lens device, and the space to be secured between the light receiving element and the light emitting element and the detection pattern portion can be reduced.
Therefore, the size of the lens device can be reduced in the radial direction.

Further, in the lens device as an embodiment, the non-reflective carrier is a protrusion protruding in the inner peripheral direction of the operation ring.

This eliminates the need to form the non-reflective carrier in the form of a film.
That is, the non-reflective surface can be formed even under the circumstances that the non-reflective carrier cannot be formed into a film by printing or the like.

Furthermore, in the lens device as an embodiment, the non-reflective surface is formed as a part of the inner peripheral surface of the operation ring, and the reflective surface is the inner surface of the reflective carrier (15) formed on the inner peripheral surface of the operation ring. (See third embodiment).

Since the non-reflective surface is formed as a part of the inner peripheral surface of the operation ring, the operation ring can be formed of a general-purpose resin.
Therefore, cost reduction can be achieved.

Further, in the lens device as an embodiment, the reflective carrier is formed in a film shape.

As a result, the amount of protrusion of the reflective carrier is suppressed in the radial direction of the lens device, and the space to be secured between the light receiving element and the light emitting element and the detection pattern portion can be reduced.
Therefore, the size of the lens device can be reduced in the radial direction.

Further, in the lens device as an embodiment, a ring-shaped member (16) that rotates integrally with the operation ring is provided on the inner peripheral side of the operation ring, and the non-reflective surface is formed as a part of the inner peripheral surface of the operation ring. The reflective surface is formed as the inner surface of the reflective carrier located at predetermined intervals in the rotational direction in the ring-shaped member, and the ring-shaped member is transparent at least in the non-positioned portion of the reflective carrier in the rotational direction (the first). (4) Refer to the embodiment).

This eliminates the need to form a reflective carrier on the operating ring.
Therefore, even if the pattern formation of the reflective carrier fails, the ring-shaped member may be discarded, the operation ring may not be discarded, and the yield can be improved.
Further, since the non-reflective surface is formed as a part of the inner peripheral surface of the operation ring, the operation ring can be formed of a general-purpose resin.
Therefore, cost reduction can be achieved.

Furthermore, in the lens device as an embodiment, the reflective carrier is formed on the inner peripheral surface of the ring-shaped member.

This makes it possible to reduce the amount of the reflective carrier material used as compared with the case where the reflective carrier is formed on the outer peripheral surface of the ring-shaped member.
Therefore, cost reduction can be achieved. Further, by setting the forming position of the reflective carrier on the inner peripheral surface of the ring-shaped member, it becomes easy to form the reflective carrier on the ring-shaped member by tampo printing.

Further, in the lens device as an embodiment, a ring-shaped member that rotates integrally with the operation ring is provided on the inner peripheral side of the operation ring, and the reflective surface is formed as a part of the inner peripheral surface of the operation ring and is non-reflective. The surface is formed as the inner surface of the non-reflective carrier positioned at predetermined intervals in the rotational direction in the ring-shaped member, and the ring-shaped member is transparent at least in the non-positional portion of the non-reflective carrier in the rotational direction (fifth). See embodiments).

This eliminates the need to form a non-reflective carrier on the operating ring.
Therefore, even if the pattern formation of the non-reflective carrier fails, the ring-shaped member may be discarded, the operation ring may not be discarded, and the yield can be improved.
Further, since the reflective surface is formed as a part of the inner peripheral surface of the operation ring, the reflective surface is, for example, a part of the inner peripheral surface of the operation ring made of metal or a part of the inner peripheral surface of the operation ring plated with metal. As compared with the case where the reflective surface is formed by printing, it is possible to enhance the deterrent against time-dependent defects and breakage of the reflective surface.
Therefore, it is possible to suppress a decrease in detection accuracy with time regarding the amount of rotation and the direction of rotation of the operation ring.

Further, in the lens device as an embodiment, the non-reflective carrier is formed on the inner peripheral surface of the ring-shaped member.

This makes it possible to reduce the amount of the non-reflective carrier material used as compared with the case where the non-reflective carrier is formed on the outer peripheral surface of the ring-shaped member.
Therefore, cost reduction can be achieved. Further, by setting the formation position of the non-reflective carrier on the inner peripheral surface of the ring-shaped member, it becomes easy to form the non-reflective carrier on the ring-shaped member by tampo printing.

Furthermore, in the lens device as an embodiment, two light receiving elements, a first light receiving element and a second light receiving element, are provided as light receiving elements, and the first light receiving signal which is the light receiving signal of the first light receiving element and the second light receiving element of the second light receiving element. It is provided with an arithmetic circuit (53) that calculates the amount of rotation of the operation ring based on a second light receiving signal which is a light receiving signal and a plurality of threshold values set for each of the first light receiving signal and the second light receiving signal. ..

As a result, the amount of rotation is calculated based on a plurality of points in the waveforms of the first light receiving signal and the second light receiving signal.
Therefore, it is possible to improve the detection resolution of the rotation amount as compared with the case where the rotation amount is calculated based only on the zero cross point of the first light receiving signal and the second light receiving signal.

Further, in the lens device as an embodiment, the calculation circuit calculates the rotation amount by using a plurality of reference coordinates set on the Lissajous circle as threshold values for the first light receiving signal and the second light receiving signal.

As a result, the rotation amount calculation based on the Lissajous circle is performed under the condition that the positional accuracy of the two light receiving elements is high.
Therefore, it is possible to improve the detection resolution of the rotation amount.

It should be noted that the effects described in the present specification are merely examples and are not limited, and other effects may be obtained.

<8. Modification example>

The present technology is not limited to the above-mentioned specific examples, and various configurations can be adopted.
For example, in the above, an example of applying this technology to an optical element drive system for focus adjustment has been given, but this technology is also suitably applied to other applications such as an optical element drive system for zoom adjustment. can.

Further, in the above, the case where the lens device according to the present technology is configured as an interchangeable lens is illustrated, but the lens device according to the present technology may take a form integrated with a camera main body portion having an image pickup element or the like.

Further, the method for calculating the amount of rotation is not limited to the method exemplified above, and other methods may be adopted.

<9. This technology>

The present technology can also adopt the following configurations.
(1)
The operation ring that is rotated and operated
A light emitting element that emits light and
Equipped with multiple light receiving elements
A detection pattern unit having a reflective surface and a non-reflective surface that are alternately arranged in the rotation direction of the operation ring and move with the rotation of the operation ring is provided.
The light emitting element emits light to the detection pattern portion and emits light.
A lens device in which the plurality of light receiving elements are arranged on the same substrate and receive light reflected from the reflecting surface.
(2)
The lens device according to (1) above, wherein the plurality of light receiving elements are arranged so that the light receiving surface faces the reflecting surface.
(3)
Two light receiving elements, a first light receiving element and a second light receiving element, are provided as the light receiving element.
The center of the light emitting surface of the light emitting element is located between the center of the light receiving surface of the first light receiving element and the center of the light receiving surface of the second light receiving element in the arrangement direction in which the reflecting surface and the non-reflective surface are lined up. The lens device according to (1) or (2) above.
(4)
The lens device according to (3) above, wherein at least a part of the first light receiving element and at least a part of the second light receiving element are located within the arrangement range of the light emitting elements in the alignment direction.
(5)
The lens device according to (4) above, wherein all of the first light receiving elements and all of the second light receiving elements are located within the arrangement range of the light emitting elements in the alignment direction.
(6)
At least a part of the first light receiving element and at least a part of the second light receiving element are located within the arrangement range of the light emitting element in the pattern orthogonal direction which is the axial direction of the rotation axis of the operation ring. The lens device according to 3).
(7)
The lens device according to (6) above, wherein all of the first light receiving elements and all of the second light receiving elements are located within the arrangement range of the light emitting elements in the pattern orthogonal direction.
(8)
A first substrate on which the light emitting element is arranged is provided.
The lens device according to any one of (1) to (7) above, wherein the second substrate, which is the substrate on which the plurality of light receiving elements are arranged, is arranged on the first substrate.
(9)
The lens apparatus according to any one of (1) to (8) above, wherein the widths of the reflective surface and the non-reflective surface are 0.3 mm or less in the line-up direction of the reflective surface and the non-reflective surface. ..
(10)
The reflective surface is formed as part of the inner peripheral surface of the operating ring.
The lens device according to any one of (1) to (9) above, wherein the non-reflective surface is formed as an inner surface of a non-reflective carrier formed on the inner peripheral surface of the operation ring.
(11)
The lens apparatus according to (10) above, wherein the non-reflective carrier is formed in a film shape.
(12)
The lens device according to (10) above, wherein the non-reflective carrier is a protrusion protruding in the inner peripheral direction of the operation ring.
(13)
The non-reflective surface is formed as a part of the inner peripheral surface of the operation ring.
The lens device according to any one of (1) to (9) above, wherein the reflective surface is formed as an inner surface of a reflective carrier formed on the inner peripheral surface of the operation ring.
(14)
The lens device according to (13) above, wherein the reflective carrier is formed in a film shape.
(15)
A ring-shaped member that rotates integrally with the operation ring is provided on the inner peripheral side of the operation ring.
The non-reflective surface is formed as a part of the inner peripheral surface of the operation ring.
The reflective surface is formed as an inner surface of a reflective carrier located at predetermined intervals in the rotational direction in the ring-shaped member.
The lens device according to any one of (1) to (9) above, wherein the ring-shaped member has at least a non-positional portion of the reflective carrier transparent in the rotation direction.
(16)
The lens device according to (15) above, wherein the reflective carrier is formed on the inner peripheral surface of the ring-shaped member.
(17)
A ring-shaped member that rotates integrally with the operation ring is provided on the inner peripheral side of the operation ring.
The reflective surface is formed as a part of the inner peripheral surface of the operation ring.
The non-reflective surface is formed as an inner surface of a non-reflective carrier located at predetermined intervals in the rotational direction in the ring-shaped member.
The lens device according to any one of (1) to (9) above, wherein the ring-shaped member has at least a non-positional portion of the non-reflective carrier transparent in the rotation direction.
(18)
The lens device according to (17) above, wherein the non-reflective carrier is formed on the inner peripheral surface of the ring-shaped member.
(19)
Two light receiving elements, a first light receiving element and a second light receiving element, are provided as the light receiving element.
A plurality of settings are made for each of the first light receiving signal which is the light receiving signal of the first light receiving element, the second light receiving signal which is the light receiving signal of the second light receiving element, and the first light receiving signal and the second light receiving signal. The lens device according to any one of (1) to (18) above, comprising an arithmetic circuit for calculating the amount of rotation of the operation ring based on the threshold value.
(20)
The lens device according to (19) above, wherein the calculation circuit calculates the rotation amount using a plurality of reference coordinates set on a Lissajous circle as threshold values for the first light receiving signal and the second light receiving signal.

1,1A, 1B, 1C, 1D lens device, 2f, 2fA focus operation ring, 2fa inner peripheral surface, 7,7A non-reflective carrier, 8,8u, 8d wiring board, 9,9A, 9B, 9C, 9D detector 10 light emitting element, 10a light emitting surface, 11 first light receiving element, 12 second light receiving element, 11a, 12a light receiving surface, 13 substrate, 15 reflective carrier, 16 ring-shaped member, 16a inner peripheral surface, 16b outer peripheral surface, 20, 20A, 20B Reflective surface, 21, 21A, 21B, 21C Non-reflective surface, 22, 22A, 22B, 22C, 22D Detection pattern unit, 53 Calculation circuit

Claims (20)

The operation ring that is rotated and operated
A light emitting element that emits light and
Equipped with multiple light receiving elements
A detection pattern unit having a reflective surface and a non-reflective surface that are alternately arranged in the rotation direction of the operation ring and move with the rotation of the operation ring is provided.
The light emitting element emits light to the detection pattern portion and emits light.
The plurality of light receiving elements are arranged on the same substrate and receive the reflected light from the reflecting surface .
As the light receiving element, two light receiving elements, a first light receiving element and a second light receiving element, are provided.
In the alignment direction in which the reflective surface and the non-reflective surface are lined up, the center of the light emitting surface of the light emitting element is positioned between the center of the light receiving surface of the first light receiving element and the center of the light receiving surface of the second light receiving element. ,
The first light receiving element and the second light receiving element are arranged apart from the light emitting element in the pattern orthogonal direction which is the axial direction of the rotation axis of the operation ring.
A lens device in which at least a part of the first light receiving element and at least a part of the second light receiving element are located within the arrangement range of the light emitting elements in the alignment direction. In the plurality of light receiving elements, the light receiving surface is arranged so as to face the reflecting surface.
The lens device according to claim 1. All of the first light receiving elements and all of the second light receiving elements are located within the arrangement range of the light emitting elements in the alignment direction.
The lens device according to claim 1 or 2. A first substrate on which the light emitting element is arranged is provided.
The second substrate, which is the substrate on which the plurality of light receiving elements are arranged, is arranged on the first substrate.
The lens device according to any one of claims 1 to 3. The widths of the reflective surface and the non-reflective surface in the alignment direction were set to 0.3 mm or less, respectively.
The lens device according to any one of claims 1 to 4. The reflective surface is formed as part of the inner peripheral surface of the operating ring.
The non-reflective surface is formed as an inner surface of a non-reflective carrier formed on the inner peripheral surface of the operation ring.
The lens device according to any one of claims 1 to 5. The non-reflective carrier is formed in a film shape.
The lens device according to claim 6. The non-reflective carrier is a protrusion protruding in the inner peripheral direction of the operation ring.
The lens device according to claim 6. The non-reflective surface is formed as a part of the inner peripheral surface of the operation ring.
The reflective surface is formed as an inner surface of a reflective carrier formed on the inner peripheral surface of the operation ring.
The lens device according to any one of claims 1 to 5. The reflective carrier is formed in a film shape.
The lens device according to claim 9. A ring-shaped member that rotates integrally with the operation ring is provided on the inner peripheral side of the operation ring.
The non-reflective surface is formed as a part of the inner peripheral surface of the operation ring.
The reflective surface is formed as an inner surface of a reflective carrier located at predetermined intervals in the rotational direction in the ring-shaped member.
In the ring-shaped member, at least the non-positional portion of the reflective carrier in the rotational direction is transparent.
The lens device according to any one of claims 1 to 5. The reflective carrier is formed on the inner peripheral surface of the ring-shaped member.
The lens device according to claim 11. A ring-shaped member that rotates integrally with the operation ring is provided on the inner peripheral side of the operation ring.
The reflective surface is formed as a part of the inner peripheral surface of the operation ring.
The non-reflective surface is formed as an inner surface of a non-reflective carrier located at predetermined intervals in the rotational direction in the ring-shaped member.
In the ring-shaped member, at least the non-positional portion of the non-reflective carrier in the rotation direction is transparent.
The lens device according to any one of claims 1 to 5. The non-reflective carrier is formed on the inner peripheral surface of the ring-shaped member.
The lens device according to claim 13. A plurality of settings are made for each of the first light receiving signal which is the light receiving signal of the first light receiving element, the second light receiving signal which is the light receiving signal of the second light receiving element, and the first light receiving signal and the second light receiving signal. A calculation circuit for calculating the amount of rotation of the operation ring based on the set threshold value is provided.
The lens device according to any one of claims 1 to 14. The calculation circuit calculates the rotation amount by using a plurality of reference coordinates set on the Lissajous circle as threshold values for the first light receiving signal and the second light receiving signal.
The lens device according to claim 15. The operation ring that is rotated and operated
A light emitting element that emits light and
Equipped with multiple light receiving elements
A detection pattern unit having a reflective surface and a non-reflective surface that are alternately arranged in the rotation direction of the operation ring and move with the rotation of the operation ring is provided.
The light emitting element emits light to the detection pattern portion and emits light.
The plurality of light receiving elements are arranged on the same substrate and receive the reflected light from the reflecting surface.
A ring-shaped member that rotates integrally with the operation ring is provided on the inner peripheral side of the operation ring.
The non-reflective surface is formed as a part of the inner peripheral surface of the operation ring.
The reflective surface is formed as an inner surface of a reflective carrier located at predetermined intervals in the rotational direction in the ring-shaped member.
In the ring-shaped member, at least the non-positional portion of the reflective carrier in the rotational direction is transparent.
Lens device. The reflective carrier is formed on the inner peripheral surface of the ring-shaped member.
The lens device according to claim 17. A first substrate on which the light emitting element is arranged is provided.
The second substrate, which is the substrate on which the plurality of light receiving elements are arranged, is arranged on the first substrate.
The lens apparatus according to claim 17 or 18. Two light receiving elements, a first light receiving element and a second light receiving element, are provided as the light receiving element.
A plurality of settings are made for each of the first light receiving signal which is the light receiving signal of the first light receiving element, the second light receiving signal which is the light receiving signal of the second light receiving element, and the first light receiving signal and the second light receiving signal. A calculation circuit for calculating the amount of rotation of the operation ring based on the set threshold value is provided.
The lens apparatus according to any one of claims 17 to 19.

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