CN109804289A

CN109804289A - Lens assembly

Info

Publication number: CN109804289A
Application number: CN201780054246.9A
Authority: CN
Inventors: 山内康照
Original assignee: Sony Corp
Current assignee: Sony Corp
Priority date: 2016-09-13
Filing date: 2017-07-26
Publication date: 2019-05-24
Also published as: WO2018051645A1; JP6973398B2; JPWO2018051645A1

Abstract

In order to improve the detection resolution for the rotation amount for operating ring, while inhibiting the increase of the size of lens assembly.Lens assembly according to this technology includes: operation ring, executes rotation process on operation ring；Photocell is configured to shine；Multiple light receiving elements；Detection pattern part, has reflecting surface and non-reflective background, and reflecting surface and non-reflective background are arranged alternately on the direction of rotation of operation ring and are moved according to the rotation of operation ring.Photocell emits light into detection pattern part and multiple light receiving elements arrangement on the same substrate and receives the reflected light from reflecting surface.

Description

Lens assembly

Technical field

This technology is related to a kind of lens assembly, including operates ring, such as focusing operation ring or zoom operation ring, and outstanding It is related to a kind of for detecting the technical field for operating the rotation amount or direction of rotation of ring.

Background technique

For example, in such as interchangeable lens, in the various lens assemblies of video camera or digital still camera, such as lens Optical element setting in inside, the rotation process by the way that operation ring in outer circumferential side is arranged makes optical element in optical axis Direction on move, therefore can be focused or zoom.

The example for the method that rotation process by operating ring executes focusing or zoom includes that Mechanical Driven method and electricity drive Dynamic method.Cam ring and operation ring in Mechanical Driven method for moving optical element is mechanically connected to each other, and according to behaviour The power for making the rotation of ring is transferred mechanically to cam ring to move optical element.Cam ring and operation ring between mechanical connection by The component of such as gear, roller or key executes.

In addition, rotation amount or direction of rotation of the electric drive method by predetermined sensor electricity read operation ring, pass through operation The drive volume of circuit counting optical element, driving circuit are based on drive volume calculated and drive actuator, thus mobile optics member Part.

In Mechanical Driven method, since optical element and operation ring are mechanically connected to each other, even if the rotation of operation ring Turn amount very little, optical element can also be followed and be moved.However, in Mechanical Driven method, due to using large-sized cam ring, Therefore, it is difficult to minimize lens assembly.In addition, in conjunction with the operation of large-dimension cam ring, it is difficult to be driven with high speed and very small amount Dynamic optical element.Therefore, especially in moving image capture, it is impossible to which response moves at a high speed and minutely optical element in the recent period Demand.

On the other hand, it in electric drive method, since optical element is mobile by electric actuator, is easy high speed and moves Dynamic optical element.Further, since can be omitted cam ring used in Mechanical Driven method, therefore lens assembly can be made small-sized Change.

Here, according to the difference of the rotation amount of electrical read operation ring and the method for direction of rotation, electric drive method is divided into " speed increasing method " and " directly reading method ".

Speed increasing method is the method for increasing the rotation speed of operation ring by gear, and is read by rotation detection device The increased rotation of speed.In speed increasing method, due to increasing the rotation speed of operation ring by gear, so while speedup side Method does not reach the speed of Mechanical Driven method, but having an advantage in that is the detection resolution that rotation amount can be improved.However, It has the drawback that, due to the backlash of speed increasing gear, it may occur however that operate the lag of the direction of rotation of ring.Additionally, there are lack Point is difficult in the lens assembly for executing folding operation using speed increasing method.In the lens assembly for executing folding operation, protect The lens frame of lens is held by cam ring stretching/retraction, however, rotation detection device is larger in speed increasing method, and is being rotated Detection device is arranged in the case where lens assembly inside, and rotation detection device disturbs lens-mount.In order to avoid interference, need Ensure rotation detection device in the arrangement space in the radial direction of lens assembly, as a result, to promote the size of lens assembly Increase.

As described in following patent document 1, the method for directly reading alternately is set on the inner circumferential surface of operation ring Reflecting surface and non-reflective background are set, the reflective optical system with photocell and light receiving element is arranged towards reflecting surface Position at, light receiving element receive from photocell emit and by reflecting surface according to operation ring rotary reflection light, And it reads according to the output waveform for receiving intensity variation (for example, with reference to [0002] section etc.).

In directly reading method, in order to detect the direction of rotation of operation ring, two reflective optical systems are provided.Setting Two reflective optical systems, so that the output waveform of the light receiving element of two reflective optical systems has such as 90 degree of phase difference.Therefore, When operation ring edge rotates in the forward direction, the phase of the output waveform of a light receiving element guides the output of another light receiving element Waveform, and when operating ring and reversely rotating, the phase of the output waveform of another light receiving element guides a light receiving element Output waveform, and it is possible to detect the rotation of operation ring based on the phase relation between each output waveform as described above Turn direction.

In directly reading method, the problem of direction of rotation for operating ring in speed increasing method lags will not occur, and Since reflective optical system is small, it is possible to be suitably applied to the method for directly reading to execute the lens assembly of folding operation.

Quotation list

Patent document

Patent document 1:JP 2015-141232A

Summary of the invention

Technical problem

However, directly read in method in traditional, due to two optical reflectors be it is separately installed, it is anti-in light Positional relationship between emitter is likely to occur error, and the phase difference of output waveform tends to change in each product.

In directly reading method, rotation can be increased by the spacing reduced between reflecting surface and non-reflective background The detection resolution of amount.However, in order to realize high-resolution, as the spacing between reflecting surface and non-reflective background narrows, The variation of phase difference as described above cannot be ignored.

That is, directly reading in method in traditional, due to the location error between two reflective optical systems, table is reflected Formation spacing between face and non-reflective background cannot sufficiently narrow, and limit the raising of detection resolution.

Therefore, the purpose of this technology is that the rotation amount of operation ring is improved while the size for inhibiting lens assembly increases Detection resolution.

Solution to the problem

According to the lens assembly of this technology, comprising: operation ring executes rotation process on the operation ring；Light emitting member Part is configured to shine；Multiple light receiving elements；And detection pattern part, there is reflecting surface and non-reflective background, it is described anti- Reflective surface and the non-reflective background are arranged alternately on the direction of rotation of operation ring and are moved according to the rotation of operation ring. Photocell emits light into detection pattern part and the multiple light receiving element arrangement on the same substrate and receives Reflected light from the reflecting surface.

On the same substrate due to the setting of multiple light receiving elements, so the positional relationship between light receiving element is high-precision Degree ground determines, and tolerance when reducing the detection pattern of reflecting surface and non-reflective background increases.

In addition, can be omitted the cam ring for Mechanical Driven method due to using method is directly read.

About the lens assembly according to this technology, it is preferred that the optical receiving surface of multiple light receiving elements is arranged as face To reflecting surface.

Therefore, light receiving element is efficiently received reflected light.

About the lens assembly according to this technology, it is preferred that lens assembly includes the first light receiving element and the second light Both receiving elements as the light emission surface of light receiving element and photocell center in arrangement reflecting surface and non- Center and second light receiving element of the optical receiving surface of the first light receiving element are arranged in the orientation of reflecting surface Between the center of optical receiving surface.

Therefore, when making two light receiving elements receive the reflected light from reflecting surface, it is easy setting light to be offered The quantity of radiated element.

About the lens assembly according to this technology, it is preferred that at least part of the first light receiving element and the second light At least part of receiving element is in orientation within the scope of the arrangement of photocell.

Therefore, spacing distance of two light receiving elements in orientation is shortened.

About the lens assembly according to this technology, it is preferred that entire first light receiving element and entire second light-receiving Element is in orientation within the scope of the arrangement of photocell.

Therefore, spacing distance of two light receiving elements in orientation is further shortened.

About the lens assembly according to this technology, it is preferred that at least part of the first light receiving element and the second light At least part of receiving element on pattern orthogonal direction within the scope of the arrangement of photocell, the orthogonal side of the pattern To the axial direction for the rotary shaft for being the operation ring.

Therefore, the spacing distance between two light receiving elements on pattern orthogonal direction is shortened.

About the lens assembly according to this technology, it is preferred that entire first light receiving element and entire second light-receiving Element is on pattern orthogonal direction within the scope of the arrangement of photocell.

Therefore, the spacing distance between two light receiving elements on pattern orthogonal direction further shortens.

About the lens assembly according to this technology, it is preferred that lens assembly includes first substrate, is provided with light hair Element and the second substrate are penetrated, is provided with multiple light receiving elements, setting is on the first substrate.

Therefore, accurately determine that the position between light receiving element and photocell and between light receiving element is closed System.

About the lens assembly according to this technology, it is preferred that reflecting surface and non-reflective background are in arrangement reflecting surface It is equal to or less than 0.3 millimeter with each width in the orientation of non-reflective background.

Thus, it is possible to obtain being enough the detection resolution actually used.

About the lens assembly according to this technology, it is preferred that reflecting surface is formed as operating the inner circumferential surface of ring A part and non-reflective background are formed as the inner surface of the non-reflective carrier on the inner circumferential surface of operation ring.

Due to reflecting surface be formed as operate ring inner circumferential surface a part, for example, reflecting surface be capable of forming for A part of the inner circumferential surface of operation ring of the inner circumferential surface for operating ring, plating metal including metal etc..Therefore, with pass through The case where printing forms reflecting surface is compared, and the protection of the damage or breakage to reflecting surface can be enhanced.

About the lens assembly according to this technology, it is preferred that non-reflective carrier is formed as membranaceous.

Therefore, because inhibiting the overhang of non-reflective carrier in the radial direction in lens assembly, thus can reduce The space ensured between light receiving element and photocell and detection pattern part.

About the lens assembly according to this technology, it is preferred that non-reflective carrier is in the inner circle circumferential direction of operation ring Protrusion outstanding.

It therefore, there is no need to non-reflective carrier being formed as membranaceous.

About the lens assembly according to this technology, it is preferred that non-reflective background is formed as operating the inner circumferential surface of ring A part, and reflecting surface be formed as operation ring inner circumferential surface on reflective support inner surface.

The a part for being formed as operating the inner circumferential surface of ring due to non-reflective background, can be used resins for universal use shape At operation ring.

About the lens assembly according to this technology, it is preferable that reflective support is formed as film shape.

Therefore, because inhibiting the overhang of reflective support in the radial direction in lens assembly, therefore can reduce The space ensured between light receiving element and photocell and detection pattern part.

About the lens assembly according to this technology, it is preferred that lens assembly includes annular construction member, in the inner circle of operation ring It is rotated integrally on side with operation ring, non-reflective background is formed as operating a part of the inner circumferential surface of ring, reflecting surface shape Inner surface and annular construction member as the reflective support placed at a predetermined interval in annular construction member along direction of rotation are at least The non-placement part of reflective support is transparent in a rotational direction.

It therefore, there is no need to form reflective support in operation ring.

In addition, being formed as operating a part of the inner circumferential surface of ring due to non-reflective background, universal tree can be used Rouge formation operation ring.

About the lens assembly according to this technology, it is preferred that reflective support is formed in the inner circumferential surface of annular construction member On.

Therefore, compared with the case where forming reflective support on the external peripheral surface in annular construction member, it is possible to reduce reflection carries The usage amount of body material.

About the lens assembly according to this technology, it is preferred that lens assembly includes annular construction member, in the inner circle of operation ring It is rotated integrally on side with operation ring, reflecting surface is formed as operating a part of the inner circumferential surface of ring, non-reflective background shape Inner surface and annular construction member as the non-reflective carrier placed at a predetermined interval in annular construction member along direction of rotation are extremely The non-placement part of few non-reflective carrier is transparent in a rotational direction.

It therefore, there is no need to form non-reflective carrier in operation ring.

In addition, being formed as operating a part of the inner circumferential surface of ring due to reflecting surface, for example, reflecting surface being capable of shape A part as the inner circumferential surface of operation ring for including the operation inner circumferential surface of ring of metal, plating metal etc..Therefore, with The case where forming reflecting surface by printing is compared, and the protection of the damage or breakage to reflecting surface can be enhanced.

About the lens assembly according to this technology, it is preferred that non-reflective carrier is formed in the inner circle weekly form of annular construction member On face.

Therefore, compared with the case where forming non-reflective carrier on the external peripheral surface in annular construction member, it is possible to reduce non-anti- Penetrate the usage amount of carrier material.

About the lens assembly according to this technology, it is preferred that lens assembly includes: the first light receiving element and the second light Light receiving element is used as both in receiving element；And computing circuit, it is configured to connect as the light of the first light receiving element The first light receiving signal for collecting mail number, as the second light receiving element light receiving signal the second light receiving signal and be the Each of one light receiving signal and the second light receiving signal setting multiple threshold values come execute operation ring rotation amount fortune It calculates.

Therefore, multiple points in the waveform of each of the first light receiving signal and the second light receiving signal are come based on Calculate rotation amount.

About the lens assembly according to this technology, it is preferable that computing circuit is by using in Lisa such as circle (Lissajous Circle the multiple reference coordinates being arranged on) execute rotation as the threshold value of the first light receiving signal and the second light receiving signal The operation of amount.

Therefore, it executes under the conditions of the position precision between two light receiving elements is arranged to high-precision based on Lisa Such as round rotation amount operation.

Advantageous effect of the invention

According to this technology, the detection that operation ring rotation amount can be improved while inhibiting lens assembly size to increase is differentiated Rate.

Note that effect described herein is not necessarily restrictive, and may refer to described in this specification any A kind of effect.

Detailed description of the invention

[Fig. 1] Fig. 1 is the schematic external perspective view of the lens assembly as first embodiment.

[Fig. 2] Fig. 2 is when cutting lens assembly 1 along the direction perpendicular to optical axis at the position of line A-A' shown in Fig. 1 Perspective schematic view.

[Fig. 3] Fig. 3 is the enlarged drawing of part shown in dotted line in Fig. 2.

[Fig. 4] Fig. 4 is the schematic diagram of the detection pattern part in the embodiment.

[Fig. 5] Fig. 5 is the perspective schematic view of the detection unit from the side of operation ring.

[Fig. 6] Fig. 6 is the figure for schematically showing the positional relationship between detection unit and detection pattern part.

[Fig. 7] Fig. 7 is the front view of detection unit.

[Fig. 8] Fig. 8 is to schematically show detection pattern part in face of light emission surface, optical receiving surface and light-receiving table The figure of the aspect in face.

[Fig. 9] Fig. 9 is the figure for showing the waveform for each light receiving signal that phase difference is 90 degree.

[Figure 10] Figure 10 is for illustrating the entire optical element drive system in lens assembly according to first embodiment Configuration block diagram.

[Figure 11] Figure 11 is to show the figure that the output waveform from two reflective optical systems is indicated with rectangular wave.

[Figure 12] Figure 12 is the front view of the detection unit as first variation.

[Figure 13] Figure 13 is the front view as the detection unit of the second variation.

[Figure 14] Figure 14 is the front view as the detection unit of third variation.

[Figure 15] Figure 15 is the schematic of the detection unit as the 4th variation from the peripheral side of operation ring View.

[Figure 16] Figure 16 is the schematic perspective for showing the major part of amplification of lens assembly according to the second embodiment Figure.

[Figure 17] Figure 17 is the schematic perspective for showing the major part of amplification of lens assembly according to the third embodiment Figure.

[Figure 18] Figure 18 is the schematic perspective for showing the major part of amplification of the lens assembly according to fourth embodiment Figure.

[Figure 19] Figure 19 is the schematic perspective for showing the major part of amplification of the lens assembly according to the 5th embodiment Figure.

[Figure 20] Figure 20 is for illustrating the figure based on the Lisa such as rotation amount operation method of circle.

[Figure 21] Figure 21 is for illustrating the figure using the rotation amount operation method for intersecting point methods.

Specific embodiment

Hereinafter, embodiment will be described in the following sequence with reference to attached drawing.

<1. first embodiment>

[1-1. and rotation amount detect related configuration]

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

[1-3. and the relevant technologies compare]

[1-4. variation related with the configuration of photocell and light receiving element]

<2. second embodiment>

<3. 3rd embodiment>

<4. fourth embodiment>

<5. the 5th embodiment>

<6. about rotation amount operation method>

<8. variation>

<9. current techniques>

<1. first embodiment>

[configuration of 1-1. rotation amount detection]

Firstly, reference Fig. 1 and Fig. 8 are described related with the rotation amount detection in the lens assembly 1 as first embodiment Main configuration.

Fig. 1 is the schematic external perspective view of lens assembly 1, and Fig. 2 is at the position of line A-A' shown in Fig. 1 along vertical Perspective schematic view and Fig. 3 when lens assembly 1 is cut in the direction of optical axis Axo are the amplifications of part shown in dotted line in Fig. 2 Figure.

Lens assembly 1 is configured to interchangeable lens, is detachably connected to unshowned camera apparatus main body (phase owner Body) and there is substantial cylindrical shape.

Hereinafter, the axial direction of optical axis Axo is defined as to the front-rear direction of lens assembly 1.It is mounted on camera apparatus master Side on body is defined as the back side, and side corresponding thereto is defined as front.

Lens assembly 1 includes two operation rings comprising the focusing operation ring as the operating element for executing focus adjustment The zoom operation ring 2z of 2f and the operating element as execution zooming adjustment；Removable section 3 has relative to positioned at rear end The detachable mechanism of the camera apparatus main body in portion；Light from the object for being located at front end is directed to camera lens dress by preceding globe lens 4 Set 1 inside；And mirror head outer shell part 5, support focusing operation ring 2f or zoom operation ring 2z.

Focusing operation ring 2f and zoom operation ring 2z is separated from each other setting, and its excircle in the axial direction of optical axis Axo Surface is externally exposed.In this example, each rotary shaft of focusing operation ring 2f and zoom operation ring 2z substantially with optical axis Axo is overlapped.That is, the direction of rotation of focusing operation ring 2f and zoom operation ring 2z substantially with surround optical axis Axo axis Direction it is consistent.

Note that hereinafter, the direction of rotation of focusing operation ring 2f is known as " direction of rotation R " (referring to Fig. 3).

Mirror head outer shell part 5 indicates that covering is arranged in the cylindrical part of the various optical elements inside lens assembly 1 Part in addition to focusing operation ring 2f and zoom operation ring 2z.

Although being not shown, as the optical element inside lens assembly 1, for example, being set gradually from front fixed poly- Focus lens, movable condenser lens can be changed amplifying lens, aperture, relay lens etc..In the case where focusing operation ring 2f rotation, Movable condenser lens moves along optical axis Axo and executes focusing adjustment.In addition, can be changed in the case where rotating zoom operation ring 2z Amplifying lens moves along optical axis Axo and executes zooming adjustment.

In lens assembly 1, executed by above-mentioned electric drive method according to the movable of the rotation process of focusing operation ring 2f The driving of condenser lens.That is, driving the actuator of movable condenser lens that the inside of lens assembly 1 is arranged in.Note that this It will a little describe again later.

In lens assembly 1, the inner circumferential side of focusing operation ring 2f is set with fixing component 6 generally annular in shape (referring to figs. 2 and 3).The position of fixing component 6 is fixed on the inside of lens assembly 1, and external peripheral surface 6a is positioned to face To the inner circumferential surface 2fa of focusing operation ring 2f.

Generally circular opening M is formed in the inner circumferential side of fixing component 6.

It is provided with detection pattern part 22 at the position of the external peripheral surface 6a towards fixing component 6, wherein reflecting table Face 20 and non-reflective background 21 are arranged alternately along direction of rotation R.In detection pattern part 22, reflecting surface 20 and non-reflective table The alternating repetitive pattern in face 21 is formed in the whole circumference of direction of rotation R.

In this example, focusing operation ring 2f includes the metal with high optical reflectance, such as aluminium, and inner circumferential surface 2fa is metal surface.In addition, being arranged at a predetermined interval on the inner circumferential surface 2fa of focusing operation ring 2f along direction of rotation R The non-reflective carrier 7 of resin material including the black resin such as with light reflectivity.Non-reflective carrier 7 for example passes through print Brush etc. is formed as membranaceous.

In detection pattern part 22, non-reflective background 21 is formed as the inner surface of non-reflective carrier 7.Note that inner surface It is the surface towards the side optical axis Axo.

In addition, reflecting surface 20 is formed as a part of the inner circumferential surface 2fa of focusing operation ring 2f.That is, packet The non-arranging section of each of the non-reflective carrier 7 on the inner circumferential surface 2fa of metal surface is included as reflecting surface 20.

Note that focusing operation ring 2f does not need to include metal.In addition, for example, by implementing such as on inner peripheral surface 2fa The coat of metal or light-reflecting sheet can increase the light reflectivity of inner peripheral surface 2fa.

As described above, each reflecting surface 20 is formed as a part of the inner circumferential surface 2fa of focusing operation ring 2f, and Each non-reflective background 21 is formed as the inner surface of the non-reflective carrier 7 on inner circumferential surface 2fa.Therefore, detection figure It is moved according to being rotated on the R of direction of rotation for focusing operation ring 2f case part 22.

In detection pattern part 22, the formation spacing between reflecting surface 20 and non-reflective background 21 is set to constant Spacing.That is, as in conceptual view in figure 4, in detection pattern part 22, each reflecting surface 20 is in direction of rotation The width w21 of width w20 and each non-reflective background 21 in the direction of rotation R on R is identical.

In this example, width w20 and width w21 is equal to or less than 0.3mm.Thus, it has already been proven that can be enough The detection resolution of actual use.

In Fig. 3, for example, circuit board 8 is flexible base board, it is fixed on the external peripheral surface 6a of fixing component 6 Pre-position, and detection unit 9 is arranged on the external peripheral surface of circuit board 8, for according to reflecting surface 20 and non-anti- Penetrate rotation amount or the direction of rotation of the test pattern focusing operation ring 2f in face 21.

Fig. 5 is the perspective schematic view of the detection unit 9 from the side of focusing operation ring 2f.In Fig. 5, it is also shown that A part of circuit board 8.

Detection unit 9 includes photocell 10, the first light receiving element 11, the second light receiving element 12,13 He of substrate Covering part 14.Photocell 10 has luminous light emission surface 10a, and by light emission surface 10a in face of detection The direction of pattern part 22 is arranged on circuit board 8.

First light receiving element 11 and the second light receiving element 12 are all disposed on substrate 13, and substrate 13 passes through first The optical receiving surface 12a of the optical receiving surface 11a of light receiving element 11 and the second light receiving element 12 faces detection pattern part 22 direction is arranged on circuit board 8.Note that circuit board 8 corresponds to " first substrate ", substrate 13 corresponds to " the second base Plate ".

In this example, the first light receiving element 11 and the second light receiving element 12 are set by single semiconductor fabrication process It sets on the substrate 13.

Covering part 14 is prominent from wiring board 8 in the thickness direction thereof, and is formed as covering photocell 10, the The part on the periphery of one light receiving element 11 and the second light receiving element 12.Covering part 14 prevents the unexpected of such as exterior light Light leaks into the first light receiving element 11 and the second light receiving element 12.In addition, covering part 14 also prevents such as dust Foreign matter adheres to optical receiving surface 10a, optical receiving surface 11a and optical receiving surface 12a.

It is thus possible to improve to the detection accuracy of rotation amount or direction of rotation.

Fig. 6 schematically shows the positional relationship between detection unit 9 and detection pattern part 22.Note that in Fig. 6 In, the positional relationship between detection unit 9 and detection pattern part 22 is shown from the side optical axis Axo, and show with perspective Detection unit 9 is gone out.

As shown in fig. 6, photocell 10, the first light receiving element 11 and the second light receiving element in detection unit 9 12 are positioned in face of detection pattern part 22.

Here, the direction " X " of four-headed arrow meaning is reflecting surface 20 and non-reflective in detection pattern part 22 in Fig. 6 The orientation on surface 21, hereinafter referred to as " orientation X ".Orientation X can be referred to as tangential with direction of rotation R The parallel direction in direction.

Orientation X is and the consistent direction direction of rotation R.However, hereinafter, the side relative to focusing operation ring 2f Direction to " direction of rotation R " is used as and relative to reflecting surface 20 and the pattern of non-reflective background 21 is used as " arrangement side To X ", to distinguish the direction relative to focusing operation ring 2f and the side relative to reflecting surface 20 and the pattern of non-reflective background 21 To.

In addition, the direction " Y " of four-headed arrow meaning is the axial direction of the rotary shaft of focusing operation ring 2f in Fig. 6.It is indicated by " Y " Direction be the direction orthogonal with orientation X, and hereinafter referred to as " pattern orthogonal direction Y ".

Fig. 7 is the front view of detection unit 9, and Fig. 8 is to schematically show detection pattern part 22 in face of light emitting The figure of the aspect of surface 10a, optical receiving surface 11a and optical receiving surface 12a.Note that covering part 14 is omitted in Fig. 7 Diagram.

As shown in fig. 7, the center of optical receiving surface 10a is indicated with center c0, the center center c1 of optical receiving surface 11a It indicates, the center of optical receiving surface 12a is indicated with center c2.In detection unit 9, during center c0 is located on orientation X Between heart c1 and center c2.In this example, center c0 is located at the midpoint between the center c1 and center c2 on orientation X Place.

As shown in the solid arrow in Fig. 8, photocell 10 is sent out by light emission surface 10a to detection pattern part 22 Penetrate diverging light.

In fig. 8, the reflected light from reflecting surface 20 is indicated by dotted arrow, is emitted from a photocell 10 Light passes through respectively arranges center c0, center c1 and center c2 as described above rather than as shown in Figure 8 via 20 quilt of reflecting surface It is directed to optical receiving surface 11a and optical receiving surface 12a.That is, since the reflected light from reflecting surface 20 is by the first light-receiving Element 11 and the second light receiving element 12 receive, therefore only need provide a photocell 10.

In addition, detection unit 9 has about photocell 10, the first light receiving element 11 and the second light receiving element 12 Arrangement relation following characteristics.That is, in Fig. 7, when assuming that arrangement range of the photocell 10 on orientation X is When " rx ", at least part of at least part of the first light receiving element 11 and the second light receiving element 12 is to be located at arrangement model It encloses in rx.The only a part that Fig. 7 shows each of the first light receiving element 11 and the second light receiving element 12 is located at cloth Set the example in range rx.

Therefore, the interval between the first light receiving element 11 and the second light receiving element 12 on orientation X is shortened Distance, and size of the detection unit 9 in orientation can be reduced.

Here, by placing center c1 and center c2, them is separated from each other on orientation X, first can be generated The signal output waveform of the signal output waveform (receive photosignal waveform) of light receiving element 11 and the second light receiving element 12 it Between phase difference.Hereinafter, the received optical signal of the first light receiving element 11 will be referred to as " phase a-signal ", and second The received optical signal of light receiving element 12 will be referred to as " phase B signal ".

First light receiving element 11 and the second light receiving element 12 are arranged to be separated from each other on orientation X, so that phase Phase difference variable between position a-signal and phase B signal is substantially 90 degree.

In this example, the first light receiving element 11 and the second light receiving element 12 are arranged on orientation X each other Separation so that the spacing distance D on orientation X (or direction of rotation R) be between center c1 and center c2 width w20 and 1.5 times (referring to Fig. 6) of width w21.

Fig. 9 shows waveform (the I/V conversion of phase a-signal and phase B signal that phase signal and phase difference are 90 degree Afterwards).

When forming reflecting surface 20 and non-reflective background 21 in detection pattern part 22 with constant space, phase A letter Number and phase B signal be substantially sinusoidal signal.

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

The block diagram of reference Figure 10 is described to the configuration of the entire optical element drive system in lens assembly 1.

Lens assembly 1 includes driving circuit 50, I/V converting unit 51, A/D converting unit 52, computing circuit 53, driving electricity Road 54 and actuator 55 and each part mentioned above.Here, the optical element 56 in figure is that driven light is wanted in focus adjustment Element is learned, and in this example, above-mentioned movable focus lens correspond to optical element 56.

Driving circuit 50 drives photocell 10 to shine.I/V converting unit based on the received light quantity to the first light-receiving The electric current of each of element 11 and the second light receiving element 12 output executes I/V conversion, and obtains phase a-signal and phase B signal.Wherein signal strength is indicated with voltage.A/D converting unit 52 to the phase a-signal that is obtained by I/V converting unit 51 and Each of phase B signal executes digital sample, and phase a-signal and phase B signal are converted to the number of predetermined gray scale Word value.

Computing circuit 53 is executed based on the phase a-signal and phase B signal for being converted to digital value by A/D converting unit 52 Obtain the direction of rotation of focusing operation ring 2f and the calculation process of rotation amount.Actuator 55 is obtained based on direction of rotation and rotation amount Drive volume calculation process, and to driving circuit 54 indicate indicate drive volume value.

Driving circuit 54 drives actuator 55 based on the value that computing circuit 53 indicates.Therefore, optical element 56 is according to focusing It operates the rotation process of ring 2f and moves, and realize focus adjustment.

[1-3. and the relevant technologies compare]

It is directly read in method in traditional, since two reflective optical systems are installed respectively, between reflective optical system Error is likely to occur in positional relationship, and the phase difference of the output waveform from each reflective optical system is due to error and each Tend to change in product.

The phase for inhibiting the formation spacing of reflecting surface 20 and non-reflective background 21 to narrow the waveform diagram description of reference Figure 11 This variation of potential difference.Note that here, the phase of the output waveform of a reflective optical system is referred to as phase A, another light is come from The phase of the output waveform of reflector is referred to as phase B.In Figure 11, output waveform is briefly expressed by rectangular wave.

The top of Figure 11 shows the formation spacing in reflecting surface 20 and non-reflective background 21 and is set as wide spacing (hereafter In, referred to as " interval S ") in the case where output waveform.Note that upper side waveform, which shows phase A, not to be had for the phase B in figure There is the waveform in the case where phase difference error, downside shows the waveform in the case that phase difference error occurs for phase A.This In the case of output waveform a cycle be set as T0 [s] in the case where, between 90 degree of phase angles between phase A and phase B Difference be expressed as T0 [s]/4.

In the case where the error of allocation position occurs between two reflective optical systems, by the phase angle of a0 [s] expression in figure Variation is added to output waveform.At this point, phase angle variations a0 [s] needs to meet the condition of following [formula 1].

A0 [s] < T0 [s]/4 [formula 1]

This is because arranging the phase of phase A and phase B, and not in the case where meeting a0 [s]=T0 [s]/4 The direction of rotation of operation ring can be detected, in addition, in the case where meeting a0 [s] > T0 [s]/4, since the phase of phase B is opposite In the phase advance of phase A, therefore the direction of rotation for being mistakenly considered operation ring is reversed.

The lower part of Figure 11 shows the formation spacing in reflecting surface 20 and non-reflective background 21 and narrows to above-mentioned interval S (0 ≤ n≤1) n times in the case where output waveform.In this case, a cycle T1 and phase angle variations of output waveform A1 [s] can be indicated by following [formula 2] and [formula 3].

T1 [s]=n*T0 [s] [formula 2]

A1 [s]=a0 [s]/n [formula 3]

In addition, in this case, the difference between 90 degree of phase angles between phase A and phase B can be expressed as T1 [s] ×4。

In the case where n times of constriction of formation spacing of reflecting surface 20 and non-reflective background 21, phase angle variations a1 [s] is needed Meet the condition of following [formula 4].

A1 [s] < T1 [s]/4 [formula 4]

Here, formula 4 can be converted as follows by formula 2 and formula 3.

A0 [s]/n < n*T0 [s]/4 [formula 5]

Therefore, for n formation [formula 6] with lower inequality.

N > sqrt (4*a0 [s]/T0 [s]) [formula 6]

That is, n cannot be less than constant value sqrt (4*a0 [s]/T0 [s]), and reduce reflecting surface 20 and non-anti- The formation spacing of reflective surface 21 is conditional another aspect, in lens assembly 1, as described above, the first light receiving element 11 It is formed on same substrate 13 with the second light receiving element 12.Therefore, the first light receiving element 11 and the second light receiving element 12 Between positional relationship determine that and increasing makes reflecting surface 20 and the detection pattern of non-reflective background 21 narrow with high precision Tolerance.

It is thus possible to improve the detection resolution of the rotation amount to focusing operation ring 2f.

For the position of photocell 10, the first light receiving element 11 and the second light receiving element 12, it is contemplated that Various modifications example.

Figure 12 to Figure 14 is the detection unit 9A as first variation respectively, the detection unit 9B as the second variation And the front view of the detection unit 9C as third variation.Note that being similar to above-mentioned Fig. 7, it is omitted in Figure 12 to 14 The diagram of covering part 14.

In the following description, part similar with the part explained uses identical appended drawing reference, and omits it and retouch It states.

Similar with detection unit 9 in the detection unit 9A shown in Figure 12, center c0 is located at center on orientation X Between c1 and center c2, however, detection unit 9A and detection unit 9 the difference is that, the first light receiving element 11 is extremely Few a part and at least part of the second light receiving element 12 are located at the arrangement of photocell 10 on pattern orthogonal direction Y In range ry.Figure 12 shows entire first light receiving element 11 and entire second light receiving element 12 is located in arrangement range ry Example.

Since at least part of each of the first light receiving element 11 and the second light receiving element 12 is located at arrangement In range ry, therefore the interval distance on pattern orthogonal direction Y between the first light receiving element 11 and the second light receiving element 12 From size short, and that the detection unit 9A on pattern orthogonal direction Y can be reduced.In addition, in entire first light receiving element 11 and second light receiving element 12 be located at arrangement range ry in the case where, additionally it is possible to reduce the size on pattern orthogonal direction Y.

Detection unit 9B shown in Figure 13 and detection unit 9 the difference is that, entire first light receiving element 11 It is placed on orientation X in the arrangement range rx of photocell 10 with entire second light receiving element 12.

Therefore, the spacing distance between the first light receiving element 11 and the second light receiving element on orientation X is than inspection The spacing distance for surveying unit 9 is shorter, and size of the detection unit 9B in orientation can be further reduced.

In the detection unit 9C shown in Figure 14, center c0 on orientation X not between center c1 and center c2, However, center is arranged with the sequence of center c0, center c2 and center c1.

In this case, pass through the inclined light shaft for the light that will emit from photocell 10 to arrangement the first light-receiving member The modes such as the side of part 11 and the second light receiving element 12 make every in the first light receiving element 11 and the second light receiving element 12 One reflected light of the reception from reflecting surface 20.

Note that the arrangement of center c can also other than the arrangement of center c0 as shown in figure 14, center c2 and center c1 To be center c2, center c1 and center c0.

Figure 15 is the schematic of the detection unit 9D as the 4th variation from the peripheral side of focusing operation ring 2f Perspective view.

In this case, circuit board 8 is not used, but uses circuit board 8u and circuit board 8d.It is single in detection In first 9D, photocell 10 is formed on circuit board 8u, and the first light receiving element 11 and the second light receiving element 12 Each of be formed on circuit board 8d.

Even if by the way that photocell 10, the first light receiving element 11 and the second light receiving element 12 are arranged as described above On different substrates, it is arranged on substrate in photocell 10, the first light receiving element 11 and the second light receiving element Afterwards, the also positional relationship between adjustable photocell 10 and the first light receiving element 11 and the second light receiving element 12.

<2. second embodiment>

Next, will be described as the lens assembly 1A of second embodiment.

Note that different parts is mainly described only for lens assembly 1 in each embodiment being described below, and Since other parts are similar with the part of lens assembly 1, by the descriptions thereof are omitted.

Figure 16 is the perspective schematic view of the major part of enlarging lens device 1A, and is landform similar with above-mentioned Fig. 3 At the enlarged drawing of the part of the detection pattern part 22A of lens assembly 1A.

With lens assembly 1 the difference is that form the non-reflective carrier 7A of shape for lugs rather than film shape it is non-anti- Penetrate carrier 7.For example, non-reflective carrier 7A includes black resin, there is substantially quadrangular shape, and towards focusing operation ring 2f Inner circumferential side it is prominent.The inner circumferential surface of non-reflective carrier 7A is used separately as non-reflective background 21A.That is, non-reflective background 21A Be formed as the inner surface of non-reflective carrier 7A.

In this case, reflecting surface 20 and non-reflective background 21A are alternately arranged in the direction of rotation R, and are detected What pattern part 22A was configured to reflecting surface 20 and non-reflective background 21A is alternately arranged part.

As described above, do not need that non-reflective carrier 7A is formed as thin film shape by lens assembly 1A, and even if Non-reflective carrier 7A is also in this way, non-reflective background 21A can be formed in the case where cannot forming thin film shape by printing etc..

Note that in the above description, with the case where lens assembly 1 similarly describe and focus behaviour by being formed from metal Make ring 2f and forms the example of reflecting surface 20 on inner circumferential surface 2fa, however, focusing operation ring 2f can include resin, And non-reflective carrier 7A can be integrally formed with focusing operation ring 2f.In such a case, it is possible to including by coating etc. The reflecting material of such as metal is formed on circumferential surface 2fa to realize reflecting surface 20.

In addition, in the case where the light reflectivity of inner peripheral surface 2fa is high, the inner circumferential surface for example including metal surface 2fa, the reflective support that shape for lugs can be formed on inner circumferential surface 2fa substitute non-reflective carrier 7A.In this case, At least the light reflectivity of the inner circumferential surface of reflective support can be very high.

<3. 3rd embodiment>

Figure 17 is the perspective schematic view of the major part of the enlarging lens device 1B as 3rd embodiment, and be with Above-mentioned Fig. 3 is similarly formed the enlarged drawing of the part of the detection pattern part 22B of lens assembly 1B.

In lens assembly 1B, instead of the focusing operation ring 2f including metal, setting includes the focusing operation ring of resin 2fA, resin are, for example, black resin etc..Note that focusing operation ring 2fA need not include resin, for example, inner circumferential surface 2fa Light reflectivity can be low, for example, inner circumferential surface 2fa without light processing.

On the inner circumferential surface 2fa of focusing operation ring 2fA, being formed at a predetermined interval along direction of rotation R includes having height The reflective support 15 of the metal of light reflectivity, such as aluminium.Reflective support 15 is formed as thin film shape, for example, by printing etc., and And the inner surface of reflective support 15 is used as reflecting surface 20A.That is, reflecting surface 20A is formed as the inner surface of reflective support 15.

In addition, the non-arranging section of reflective support 15 is used as non-anti-on the inner circumferential surface 2fa of focusing operation ring 2fA Reflective surface 21B, therefore non-reflective background 21B is formed as a part of the inner circumferential surface 2fa of focusing operation ring 2fA.

In this case, reflecting surface 20A and non-reflective background 21B are alternately arranged in the direction of rotation R, and are detected What pattern part 22B was configured to reflecting surface 20A and non-reflective background 21B is alternately arranged part.

In lens assembly 1B, as described above, non-reflective background 21B is formed as a part of inner circumferential surface 2fa, therefore Focusing operation ring 2fA can be formed with resins for universal use.

Therefore, cost can be reduced.

In addition, reflective support 15 is formed as membranaceous in lens assembly 1B.

Therefore, lens assembly 1B in the radial direction, it is suppressed that the overhang of reflective support 15, and can reduce The space ensured between detection unit 9 and detection pattern part 22B.

<4. fourth embodiment>

Figure 18 is the perspective schematic view of the major part of the enlarging lens device 1C as fourth embodiment, and be with Above-mentioned Fig. 3 is similarly formed the enlarged drawing of the part of the detection pattern part 22C of lens assembly 1C.

In lens assembly 1C, focusing operation ring 2fA is similarly used with the case where 3rd embodiment, and grasp focusing Make that the annular construction member 16 rotated integrally with focusing operation ring 2fA is arranged in the inner circumferential side of ring 2fA.

Annular construction member 16 includes that transparent material, such as transparent resin etc., and external peripheral surface 16b are fixed to focusing operation The inner circumferential surface 2fa of ring 2fA.On the inner circumferential surface 16a of annular construction member 16, reflective support 15 is along direction of rotation R with pre- Determine arranged for interval.Reflective support 15 forms thin film shape on inner circumferential surface 16a, for example, passing through printing etc..

As described above, each inner surface for the reflective support 15 being formed on the inner circumferential surface 16a of annular construction member 16 is used Make reflecting surface 20B.

Here, since annular construction member 16 is transparent, so reflective support 15 is saturating along the part that direction of rotation R is not arranged Penetrate light.That is, the light emitted from photocell 10 can reach the inner circle weekly form of focusing operation ring 2fA by the part Face 2fa.At this point, the light reflectivity of the inner circumferential surface 2fa of focusing operation ring 2fA is low, and the inner periphery of focusing operation ring 2fA Surface 2fa is used as non-reflective background 21B.Therefore, in the direction of rotation R, reflecting surface 20B and non-reflective background 21B be alternately Arrangement.

Detection pattern part 22C is configured to such part, wherein being formed in the reflection on the inner surface of reflective support 15 Surface 20B and the non-reflective background 21B of a part for being formed as inner circumferential surface 2fa are alternately arranged in the direction of rotation R.

According to lens assembly 1C as described above, do not need to form reflective support 15 on focusing operation ring 2fA.Therefore, Even if the pattern of reflective support 15 forms failure, annular construction member 16 can also be abandoned, without abandoning focusing operation ring 2fA, and And yield can be improved.

In addition, since non-reflective background 21B is formed as a part of inner circumferential surface 2fa, it can be by resins for universal use Form focusing operation ring 2fA.

Therefore, cost can be reduced.

In addition, reflective support 15 is formed on the inner circumferential surface 16a of annular construction member 16 in lens assembly 1C.Therefore, Compared with the case where forming reflective support 15 on the external peripheral surface 16b in annular construction member 16, it is possible to reduce reflective support material Usage amount.

Therefore, cost can be reduced.In addition, since the inner circle of annular construction member 16 is arranged in the forming position of reflective support 15 On perimeter surface 16a, thus it is easy to form relative to annular structure by pad printing (tampo printing/pad printing) The reflective support 15 of part 16.

Note that in the above description, it has been described that form reflection on transparent annular construction member 16 by printing etc. and carry The example of body 15, however, reflective support 15 is also capable of forming as a part of annular construction member 16.For example, providing a kind of situation, ring Shape component 16 is used as a kind of component, and wherein metal part and transparent part are along the placement of direction of rotation R alternating or similar situation. As described above, it is not always essential that annular construction member 16 is fully transparent, and at least reflective support 15 is in the direction of rotation R Non- arranging section be transparent be sufficient.

Here, reflective support 15 also can be formed on the external peripheral surface 16b of annular construction member 16.

In addition, non-reflective carrier also can be formed in the case where reflective support 15 is formed on inner circumferential surface 16a On external peripheral surface 16b.At this point, non-reflective carrier can be only in the non-arranging section with the reflective support 15 on the R of direction of rotation It is formed at corresponding position or in the whole circumference of external peripheral surface 16b.Since non-reflective carrier is formed in outer circle weekly form On the 16b of face, therefore the light reflectivity of inner circumferential surface 2fa need not be reduced, and can increase selection operation ring material from By spending.

[5. the 5th embodiment]

Figure 19 is the perspective schematic view of the major part of the enlarging lens device 1D as the 5th embodiment, and be with Above-mentioned Fig. 3 is similarly formed the enlarged drawing of the part of the detection pattern part 22D of lens assembly 1D.

In the 5th embodiment, the position in the positional relationship and fourth embodiment between reflecting surface and non-reflective background Relationship is opposite.

The case where with first embodiment, is similar, and in lens assembly 1D, using focusing operation ring 2f, annular construction member 16 is arranged In the inner circumferential side of focusing operation ring 2f, and the external peripheral surface 16b of annular construction member 16 is fixed to focusing operation ring 2f's Inner circumferential surface 2fa.

In this case, non-reflective carrier 7 is arranged in the inner periphery of annular construction member 16 along direction of rotation R at a predetermined interval On the 16a of surface.Non-reflective carrier 7 is formed on inner circumferential surface 16a with thin film shape, such as passes through printing etc..Non-reflective load Each inner surface of body 7 is used as non-reflective background 21C.

In addition, in this case, similar, the inner circumferential surface 2fa of focusing operation ring 2f the case where with first embodiment As reflecting surface 20.Therefore, in the direction of rotation R, reflecting surface 20 and non-reflective background 21C are alternately arranged.

As described above, detection pattern part 22D is configured to be alternately arranged reflecting surface 20 and non-reflective in the direction of rotation R The part of surface 21C.

According to lens assembly 1D as described above, do not need to form non-reflective carrier 7 on focusing operation ring 2f.Therefore, Even if the pattern of non-reflective carrier 7 forms failure, annular construction member 16 can also be abandoned, without abandoning focusing operation ring 2f, and And yield can be improved.

In addition, non-reflective carrier 7 is formed on the inner circumferential surface 16a of annular construction member 16.Therefore, and in annular construction member 16 External peripheral surface 16b on the case where forming non-reflective carrier 7 compare, it is possible to reduce the usage amount of non-reflective carrier material.Cause This, can reduce cost.

Further, since the forming position of non-reflective carrier 7 is arranged on the inner circumferential surface 16a of annular construction member 16, therefore It is easy to form non-reflective carrier 7 on annular construction member 16 by pad printing.

Note that in the 5th embodiment, non-reflective carrier 7 is also capable of forming as a part of annular construction member 16.That is, In five embodiments, fully transparent annular construction member 16 is not always essential, and non-reflective carrier 7 is in the direction of rotation R At least non-arranging section is transparent is sufficient.

In addition, non-reflective carrier 7 can also be formed on the external peripheral surface 16b of annular construction member 16.

In addition, reflective support also can be formed in the case where non-reflective carrier 7 is formed on inner circumferential surface 16a On external peripheral surface 16b.At this point, reflective support only can be formed in the non-cloth corresponding to non-reflective carrier 7 in the direction of rotation R It sets at the position of part or in the whole circumference of external peripheral surface 16b.It therefore, there is no need to increase the light of inner circumferential surface 2fa Reflectivity, and the freedom degree of the material of selection operation ring can be increased.Especially in this case, logical due to can choose With resin material, therefore cost can be reduced.

<6. about rotation amount operation method>

Next, the rotation amount operation method that the computing circuit 53 based on phase a-signal and phase B signal will be described.

Firstly, the rotation amount operation method by reference Figure 20 description based on Lisa such as circle.In focusing operation ring 2f in forward direction In the state of rotating on a direction in direction of rotation or reverse rotation direction, each coordinate p (α, β) is being plotted in seat In the case where marking spatially, wherein horizontal axis indicates that the value α of phase a-signal, the longitudinal axis indicate the value β of phase B signal, draws out such as figure Such as circle of Lisa shown in 20.Lisa such as circle is ideal circle ideally, wherein between phase a-signal and phase B signal Phase difference is 90 degree.

It here, is the coordinate p [t] of current value by the current value coordinate representation of value α and value β.Figure 20 B shows phase difference For the waveform of 90 degree of phase a-signals and phase B signal.However, for example, phase a-signal phase in rotating in the forward direction phase In the case where advancing over the ground, as shown in fig. 20b, the edge on the paper in Lisa such as circle when rotating in the forward direction current value coordinate p [t] It is counterclockwise mobile, and moved in a clockwise direction on the paper in Lisa such as circle during reverse rotation (referring to arriving Arrow in Figure 20 A).

Note that it is by the way that phase a-signal or the phase of phase B signal which phase distinguished that judgement, which is rotated in the forward direction/reversely rotated, It is determined to advanced.

In based on Lisa such as the rotation amount operation of circle, multiple reference coordinates are arranged at a predetermined interval in Lisa such as circle p'.Figure 20 A shows the example for setting eight reference point p'0 to p'7 to reference coordinate p'.Figure 20 B shows reference coordinate Relationship between p'0 to p'7 and phase a-signal and phase B signal.Such as, it can be seen that reference coordinate p'0 (α 0, β 0) is corresponding Time point when the value β that the value α of phase a-signal becomes maximum value and phase B signal becomes zero.

In rotation amount operation in this case, for example, whenever the current value coordinate p [t] moved in Lisa such as circle When by reference to coordinate p', steady state value is added to the current value of rotation amount.That is, the rotation whenever focusing operation ring 2f is grasped When work amount increases a certain amount of, the current value of rotation amount increases steady state value, and (in the case where reverse rotation, the current value of rotation amount subtracts It is small).

For example, based on indicated by object reference coordinate p' α and β value (for example, for α 0 in the case where reference coordinate p'0, β 0) size between relationship and current value α and value β, judge current value coordinate p [t] whether by reference to coordinate p'0 extremely Object reference coordinate p' in p'7.As an example, in the case where target when reference coordinate p'3 is to rotate in the forward direction, for working as Preceding value α and value β judges whether the condition for meeting " α≤3 and β≤3 ".Alternatively, the mesh when reference coordinate p'0 is to reversely rotate In the case of target, judge whether the condition for meeting " α≤α 0 and β≤β 0 ".

When the quantity increase for the reference coordinate p' being arranged in Lisa such as circle, the rotation amount operation based on Lisa such as circle can Increase the detection resolution of rotation amount.Therefore, rotation amount is executed with the zero cross point for being based only upon phase a-signal and phase B signal The method (hereinafter, referred to " straightforward procedure ") of operation is compared, and detection resolution can be improved.For example, setting as shown in FIG. 20 A In the case where setting eight reference coordinate p', resolution ratio can be increased to twice of straightforward procedure.

It can be said that the rotation amount operation method as described above based on Lisa such as circle is used in Lisa as being arranged on circle Rotation amount operation method of multiple reference coordinates as the threshold value of phase a-signal and phase B signal.At this point, by will be with reference to seat The setting quantity of mark p' is set as at least 5 or more, and compared with straightforward procedure, rotation amount detection resolution can be improved.

Furthermore it is also possible to say the rotation amount operation method based on Lisa such as circle be based on phase a-signal, phase B signal and For the rotation amount operation method for multiple threshold values that each phase a-signal and phase B signal are arranged.

Here, in the case that the phase difference between phase a-signal and phase B signal deviates 90 degree, shown in Figure 20 A The motion track of current value coordinate p [t] on coordinate space does not draw perfect circle.That is, reducing circularity.In base In Lisa such as the rotation amount operation of circle, it is difficult to rotation amount is accurately obtained in the case where the circularity of motion track reduces, and And it is difficult to increase the setting quantity of reference threshold p'.

In the lens assembly according to each above-described embodiment, due to the first light receiving element 11 and the second light receiving element 12 position precision increases, therefore the close perfect circle of motion track of current value coordinate p [t].Therefore, many ginsengs can be set Threshold value p' is examined, and the detection resolution of rotation amount can be increased.

Next, the rotation amount operation that reference Figure 21 description is passed through intersection point methods.

In intersecting point methods, it sets threshold value Th1 to Th5 as shown in the figure to the threshold of phase a-signal and phase B signal Value.After phase a-signal becomes maximum value and minimum value respectively, phase A letter is set by threshold value Th1 and threshold value Th5 at once Number and phase B signal intersection point value, and threshold value Th3 is set as zero.Threshold value Th2 and threshold value Th4 are respectively set to threshold The median between median and threshold value Th5 and Th3 between value Th1 and Th3.

In intersecting point methods, rotating in the forward direction or reversely rotating for the moment, the correspondence of phase a-signal and phase B signal The current value of signal is compared with corresponding threshold value Th by sequence shown in arrow in figure (1) to (4).Specifically, firstly, according to Arrow (1), for example, the fact that the current value α [t] of phase a-signal is used to reach maximum value judges current value α [t] as triggering Whether threshold value Th1 is equal to or less than.In the case where current value α [t] is equal to or less than threshold value Th1, judge that current value α [t] is It is no to be equal to or less than threshold value Th2, and in the case where current value α [t] is equal to or less than threshold value Th2, judge current value α Whether [t] is equal to or less than threshold value Th3.Hereafter, in the case where current value α [t] is equal to or less than threshold value Th5, according to arrow (2), judge that the current value β [t] of phase B signal is equal to or less than threshold value Th2.

As described above, the sequence indicated by arrow (1) to (4), judges the corresponding letter of phase a-signal and phase B signal Number current value whether sequentially through the corresponding points in threshold point shown in black circles in figure.In addition, whenever judgment threshold Point by when, steady state value is added to the current value of rotation amount.Therefore, whenever the rotation amount increase of focusing operation ring 2f is constant When amount, the value of rotation amount is changed with steady state value.That is, the rotation amount to focusing operation ring 2f carries out corresponding numerical operation.

In intersecting point methods, as the quantity of threshold value Th increases, the detection resolution of rotation amount can be improved.

Note that being similar to the rotation amount operation method based on Lisa such as circle, it may be said that as described above to intersect point methods It is the rotation amount based on phase a-signal, phase B signal and the multiple threshold values being arranged for each phase a-signal and phase B signal Operation method.

As described above, including operation ring (2f or 2fA) according to the lens assembly (1A, 1B, 1C or 1D) of the present embodiment, at it Upper execution rotation process；Photocell (10) shines；And multiple light receiving elements (11 and 12).Detection pattern is provided Partially (22,22A, 22B, 22C or 22D), with reflecting surface (20,20A or 20B) and non-reflective background (21,21A, 21B Or 21C), it is alternately arranged on the direction of rotation of operation ring and is moved according to the rotation of operation ring.Photocell is by light It is emitted to detection pattern part.Multiple light receiving elements are arranged on same substrate (13) and receive the reflection from reflecting surface Light.

On the same substrate due to multiple light receiving elements arrangement, it has accurately determined between light receiving element Positional relationship, and increase the tolerance for making the detection pattern of reflecting surface and non-reflective background narrow.

Therefore, it can be improved while the size for inhibiting lens assembly increases and the detection of the rotation amount of operation ring is differentiated Rate.

In addition, for mechanical drive system, due to can be omitted cam ring, the size of lens assembly can reduce, The optical element of target can be operated with high-speed mobile.

For acceleration system, the problem of can solve above-mentioned lag, and even if acceleration system is applied to it is foldable Also have the advantages that size can be inhibited to increase in the case where lens assembly.

In addition, the optical receiving surface of multiple light receiving elements is face in instead in lens assembly according to the embodiment Reflective surface.

Therefore, light receiving element is efficiently received reflected light.It is thus possible to improve rotation amount or the direction of rotation of operation ring Detection accuracy.

In addition, providing the first light receiving element and the second light receiving element two in the lens assembly according to the present embodiment Person is as light receiving element, and the center of the optical receiving surface of photocell is arranged in reflecting surface and non-reflective background Positioned at the center of the optical receiving surface of the first light receiving element and the optical receiving surface of second light receiving element in orientation Between center.

Therefore, in the case where making each of two light receiving elements receive the reflected light from reflecting surface, hold Easily 1 is set by the quantity of photocell.

Therefore, it can contribute to reduce number of components.

In addition, in lens assembly according to the embodiment, at least part of the first light receiving element and the second light-receiving At least part of element is in orientation within the scope of the arrangement of photocell.

It is thereby possible to reduce including in the orientation of the detection unit of at least two light receiving elements and photocell Size.

In addition, in the lens assembly according to the present embodiment, entire first light receiving element and entire second light-receiving member Part is in orientation within the scope of the arrangement of photocell.

Therefore, the arrangement of the detection unit including at least two light receiving elements and photocell can be further decreased Size on direction.

In addition, at least part of the first light receiving element and the second light connect in the lens assembly according to the present embodiment Receive element at least part arranged on pattern orthogonal direction within the scope of the arrangement of photocell, pattern orthogonal direction Operate the axial direction of the rotary shaft of ring.

It is thereby possible to reduce including the orthogonal side of pattern of the detection unit of at least two light receiving elements and photocell Upward size.

In addition, in the lens assembly of the embodiment, entire first light receiving element and entire second light receiving element position In within the scope of the arrangement of the photocell on pattern orthogonal direction.

Therefore, the pattern of the detection unit including at least two light receiving elements and photocell can be further decreased Size on orthogonal direction.

In addition, first substrate (8) are provided, are disposed with photocell thereon in the lens assembly according to the present embodiment, And the second substrate (13), arrangement on the first substrate, are disposed with multiple light receiving elements thereon.

Therefore, the position between light receiving element and photocell and between light receiving element has accurately been determined Relationship.

It is thus possible to improve the detection accuracy of rotation amount.

In addition, in the lens assembly according to the present embodiment, reflecting surface and non-reflective background in arrangement reflecting surface and Each width in the orientation of non-reflective background is equal to or less than 0.3mm.

Therefore, the precision of the various adjustings using operation ring, such as focus adjustment can be substantially ensured.

In addition, reflecting surface is formed as operating the one of the inner circumferential surface of ring in the lens assembly according to the present embodiment Part, and non-reflective background is formed on the inner surface of non-reflective carrier (7 or 7A), and non-reflective carrier (7 or 7A) is formed in It operates on the inner circumferential surface of ring (referring to the first embodiment or the second embodiment).

Due to reflecting surface be formed as operate ring inner circumferential surface a part, for example, reflecting surface be capable of forming for A part of the inner circumferential surface of the operation ring of the inner circumferential surface or metal deposition of operation ring including metal, and with it is logical It spends printing the case where forming reflecting surface to compare, the protection to reflecting surface damage at any time or destruction can be enhanced.

Therefore, the rotation amount to operation ring or the detection accuracy deterioration at any time of direction of rotation can be inhibited.

In addition, non-reflective carrier is formed as film shape in lens assembly according to the embodiment.

Therefore, because inhibiting the overhang of non-reflective carrier in the radial direction in lens assembly, therefore can reduce The space ensured between light receiving element and photocell and detection pattern part.

It is thereby possible to reduce the size of lens assembly in radial directions.

In addition, non-reflective carrier is dashed forward in the inner circle circumferential direction of operation ring in the lens assembly according to the present embodiment Protrusion out.

That is, even if can also be formed non-reflective in the case where non-reflective carrier cannot form film shape by printing etc. Surface.

In addition, non-reflective background is formed as operating the inner circumferential surface of ring in the lens assembly according to the present embodiment A part, and reflecting surface is formed as the inner surface of reflective support (15), and reflective support (15) is formed in the inner circle of operation ring (referring to 3rd embodiment) in perimeter surface.

The a part for being formed as operating the inner circumferential surface of ring due to non-reflective background, can be formed with resins for universal use Operate ring.

Therefore, cost can be reduced.

In addition, reflective support is formed as film shape in lens assembly according to the embodiment.

In addition, annular construction member (16) setting rotated integrally with operation ring exists in lens assembly according to this embodiment The inner circumferential side of ring is operated, non-reflective background is formed as a part of inner periphery, and reflecting surface is formed as the edge in annular construction member The inner surface for the reflective support that direction of rotation is placed at a predetermined interval, and annular construction member is formed so that at least reflective support Non- placement part is transparent (referring to fourth embodiment) in a rotational direction.

Therefore, even if the pattern of non-reflective carrier forms failure, annular construction member can also be abandoned, is operated without abandoning Ring, and yield can be improved.

Therefore, cost can be reduced.

In addition, reflective support is formed on the inner circumferential surface of annular construction member in the lens assembly according to the present embodiment.

Therefore, cost can be reduced.In addition, since the inner circle weekly form of annular construction member is arranged in the forming position of reflective support On face, therefore it is easy to form the reflective support relative to annular construction member by pad printing.

In addition, the annular construction member setting rotated integrally with operation ring is operating in the lens assembly according to the present embodiment The inner circumferential side of ring, reflecting surface are formed as a part of annular of the inner circumferential surface of operation, and non-reflective background is formed as in ring The inner surface for the non-reflective carrier placed at a predetermined interval in shape component along direction of rotation, and annular construction member be formed so as to Transparency is transparent (referring to the 5th embodiment) to few non-non-reflective carrier of placement part in a rotational direction.

In addition, being formed as operating a part of the inner circumferential surface of ring due to reflecting surface, for example, reflecting surface being capable of shape A part of the inner circumferential surface of inner circumferential surface or metal plating operation ring as the operation ring for including metal, and with The case where forming reflecting surface by printing is compared, and damage or damaged protection at any time to reflecting surface can be enhanced.

Therefore, rotation amount or direction of rotation the detection accuracy deterioration at any time to operation ring can be inhibited.

In addition, non-reflective carrier is formed in the inner circumferential surface of annular construction member in the lens assembly according to the present embodiment On.

Therefore, cost can be reduced.In addition, since the inner periphery of annular construction member is arranged in the forming position of non-reflective carrier On surface, therefore pass through the pad printing non-reflective carrier easy to form relative to annular construction member.

In addition, providing the first light receiving element and the second light receiving element two in the lens assembly according to the present embodiment Person provides computing circuit as light receiving element, the first light based on the light receiving signal as the first light receiving element Receive signal, as the second light receiving element light receiving signal the second light receiving signal and for the first light receiving signal and Each of second light receiving signal setting multiple threshold values come execute operation ring rotation amount operation.

Therefore, the case where calculating rotation amount with the zero cross point for being based only upon the first light receiving signal and the second light receiving signal It compares, the detection resolution of rotation amount can be improved.

In addition, computing circuit uses the multiple bases being arranged in Lisa such as circle in the lens assembly according to the present embodiment Quasi coordinates executes the operation of rotation amount as the threshold value of the first light receiving signal and the second light receiving signal.

Therefore, it is executed under the conditions of the position precision of two light receiving elements is set as high-precision based on Lisa such as circle Rotation amount operation.

It is thus possible to improve the detection resolution of rotation amount.

Note that effect described in this specification is only example, it is no intended to limit, and other effects can be provided Fruit.

<8. variation>

This technology is not limited to above-mentioned specific example, and can use various configurations.

For example, in the preceding description it has been described that this technology is applied to optical element drive system focus adjustment Example.However, this technology can also be suitably applied to other purposes, such as optical element drive system zooming adjustment.

In addition, in the preceding description it has been described that being wherein configured to interchangeable lens according to the lens assembly of this technology The case where example.However, can be integrated with the camera body with image-forming component etc. according to the lens assembly of this technology.

In addition, rotation amount operation method is not limited to the above method, and other methods can be used.

<9. current techniques>

In addition, this technology can also configure as follows.

(1) a kind of lens assembly, comprising:

Ring is operated, executes rotation process on the operation ring；

Photocell is configured to shine；

Multiple light receiving elements；And

Detection pattern part has reflecting surface and non-reflective background, the reflecting surface and the non-reflective background edge The direction of rotation of the operation ring is arranged alternately and is moved according to the rotation of the operation ring, wherein the photocell The detection pattern part is emitted light into, and

The multiple light receiving element is arranged on the same substrate and receives the reflected light from the reflecting surface.

(2) lens assembly according to (1), wherein the optical receiving surface of the multiple light receiving element is arranged as face To the reflecting surface.

(3) lens assembly according to (1) or (2), comprising:

Both first light receiving element and the second light receiving element are used as the light receiving element,

Wherein, the center of the light emission surface of the photocell is arranging the reflecting surface and the non-reflective table Be placed in the orientation in face the optical receiving surface of first light receiving element center and second light receiving element Optical receiving surface center between.

(4) lens assembly according to (3), wherein at least part of first light receiving element and described At least part of two light receiving elements is in the orientation within the scope of the arrangement of the photocell.

(5) lens assembly according to (4), wherein entire first light receiving element and entire second light connect Element is received to be placed in the orientation within the scope of the arrangement of the photocell.

(6) lens assembly according to (3), wherein at least part of first light receiving element and described At least part of two light receiving elements is located within the scope of the arrangement of the photocell on pattern orthogonal direction, the figure Case orthogonal direction is the axial direction of the rotary shaft of the operation ring.

(7) lens assembly according to (6), wherein entire first light receiving element and entire second light Within the scope of the arrangement that receiving element is placed on the photocell on the pattern orthogonal direction.

(8) lens assembly according to any one of (1) to (7), comprising:

First substrate, photocell arrangement on the first substrate,

Wherein, on the first substrate, the second substrate is to be provided with the multiple light for the second substrate setting The substrate of receiving element.

(9) lens assembly according to any one of (1) to (8), wherein the reflecting surface and the non-reflective table Each width of the face in the orientation for arranging the reflecting surface and the non-reflective background is equal to or less than 0.3 millimeter.

(10) lens assembly according to any one of (1) to (9), wherein the reflecting surface is formed as the behaviour Make a part of the inner circumferential surface of ring, and

The non-reflective background is formed as the non-reflective carrier on the inner circumferential surface of the operation ring Inner surface.

(11) lens assembly according to (10), wherein the non-reflective carrier is formed as membranaceous.

(12) lens assembly according to (10), wherein the non-reflective carrier is the inner periphery in the operation ring Protrusion outstanding on direction.

(13) lens assembly according to any one of (1) to (9), wherein the non-reflective background is formed as described A part of the inner circumferential surface of ring is operated, and

The reflecting surface is formed as the interior table of the reflective support on the inner circumferential surface of the operation ring Face.

(14) lens assembly according to (13), wherein the reflective support is formed as membranaceous.

(15) lens assembly according to any one of (1) to (9), comprising:

Annular construction member integrally rotates in the inner circumferential side of the operation ring with the operation ring,

Wherein the non-reflective background is formed as a part of the inner circumferential surface of the operation ring,

The reflecting surface is formed as the reflection placed at a predetermined interval in the annular construction member along the direction of rotation The inner surface of carrier, and

The non-placement part of the reflective support of at least described annular construction member is transparent on the direction of rotation.

(16) lens assembly according to (15), wherein the reflective support is formed in the inner circle of the annular construction member In perimeter surface.

(17) lens assembly according to any one of (1) to (9), comprising:

Wherein the reflecting surface is formed as a part of the inner circumferential surface of the operation ring,

What the non-reflective background was formed as placing at a predetermined interval on the direction of rotation in the annular construction member The inner surface of non-reflective carrier, and

The non-placement part of at least described non-reflective carrier of the annular construction member is transparent on the direction of rotation.

(18) lens assembly according to (17), wherein the non-reflective carrier is formed in the interior of the annular construction member On circumferential surface.

(19) lens assembly according to any one of (1) to (18), comprising:

Both first light receiving element and the second light receiving element are used as the light receiving element；And

Computing circuit is configured to first light-receiving letter of the light receiving signal as the first light receiving element Number, as the second light receiving element light receiving signal second light receiving signal and be first light receiving signal The operation of the rotation amount of operation ring is executed with multiple threshold values of each of second light receiving signal setting.

(20) lens assembly according to (19), wherein the computing circuit is arranged by using in Lisa such as circle Multiple reference coordinates executed as the threshold value of first light receiving signal and second light receiving signal it is described The operation of rotation amount.

Reference signs list

1,1A, 1B, 1C, 1D lens assembly

2f, 2fA focusing operation ring

2fa inner circumferential surface

7, the non-reflective carrier of 7A

8,8u, 8d circuit board

9,9A, 9B, 9C, 9D detection unit

10 photocells

10a light emission surface

11 first light receiving elements

12 second light receiving elements

11a, 12a optical receiving surface

13 substrates

15 reflective supports

16 annular construction members

16a inner circumferential surface

16b external peripheral surface

20,20A, 20B reflecting surface

21,21A, 21B, 21C non-reflective background

22,22A, 22B, 22C, 22D detection pattern part

53 computing circuits.

Claims

1. a kind of lens assembly, comprising:

Ring is operated, executes rotation process on the operation ring；

Photocell is configured to shine；

Multiple light receiving elements；And

Detection pattern part has reflecting surface and non-reflective background, and the reflecting surface and the non-reflective background are described in The direction of rotation of operation ring is arranged alternately and is moved according to the rotation of the operation ring,

Wherein the photocell emits light into the detection pattern part, and

2. lens assembly according to claim 1, wherein the optical receiving surface of the multiple light receiving element is arranged as face To the reflecting surface.

3. lens assembly according to claim 1, comprising:

Wherein, the center of the light emission surface of the photocell is arranging the reflecting surface and the non-reflective background It is connect in orientation positioned at the center of optical receiving surface of first light receiving element and the light of second light receiving element Between the center for receiving surface.

4. lens assembly according to claim 3, wherein at least part of first light receiving element and described At least part of two light receiving elements is located within the scope of the arrangement of the photocell in the orientation.

5. lens assembly according to claim 4, wherein entire first light receiving element and entire second light Receiving element is located within the scope of the arrangement of the photocell in the orientation.

6. lens assembly according to claim 3, wherein at least part of first light receiving element and described At least part of two light receiving elements is located within the scope of the arrangement of the photocell on pattern orthogonal direction, the figure Case orthogonal direction is the axial direction of the rotary shaft of the operation ring.

7. lens assembly according to claim 6, wherein entire first light receiving element and entire second light Receiving element is located within the scope of the arrangement of the photocell on the pattern orthogonal direction.

8. lens assembly according to claim 1, comprising:

First substrate, the photocell are arranged on the first substrate,

Wherein, on the first substrate, the second substrate is to be provided with the multiple light-receiving for the second substrate setting The substrate of element.

9. lens assembly according to claim 1, wherein the reflecting surface and the non-reflective background are in the reflection Each width in the orientation of surface and non-reflective background arrangement is equal to or less than 0.3mm.

10. lens assembly according to claim 1, wherein the reflecting surface is formed as the inner periphery of the operation ring The a part on surface, and

The non-reflective background is formed as the interior table of the non-reflective carrier on the inner circumferential surface of the operation ring Face.

11. lens assembly according to claim 10, wherein the non-reflective carrier is formed as membranaceous.

12. lens assembly according to claim 10, wherein the non-reflective carrier is the inner periphery in the operation ring Protrusion outstanding on direction.

13. lens assembly according to claim 1, wherein the non-reflective background is formed as the inner circle of the operation ring A part of perimeter surface, and

The reflecting surface is formed as the inner surface of the reflective support on the inner circumferential surface of the operation ring.

14. lens assembly according to claim 13, wherein the reflective support is formed as membranaceous.

15. lens assembly according to claim 1, comprising:

The reflecting surface is formed as the reflective support placed at a predetermined interval in the annular construction member along the direction of rotation Inner surface, and

16. lens assembly according to claim 15, wherein the reflective support is formed in the inner circle of the annular construction member In perimeter surface.

17. lens assembly according to claim 1, comprising:

The non-reflective background is formed as placing at a predetermined interval on the direction of rotation in the annular construction member non-anti- The inner surface of carrier is penetrated, and

18. lens assembly according to claim 17, wherein the non-reflective carrier is formed in the interior of the annular construction member On circumferential surface.

19. lens assembly according to claim 1, comprising:

Computing circuit is configured to the first light receiving signal of the light receiving signal as first light receiving element, makees For the light receiving signal of second light receiving element the second light receiving signal and be first light receiving signal and institute Multiple threshold values of each of second light receiving signal setting are stated to execute the operation of the rotation amount of the operation ring.

20. lens assembly according to claim 19, wherein the computing circuit is arranged by using in Lisa such as circle Multiple reference coordinates as described to execute for the threshold value of first light receiving signal and second light receiving signal The operation of rotation amount.