JP6226043B2 - Anti-vibration device, optical equipment - Google Patents

Description

  The present invention relates to a vibration isolator and an optical apparatus that suppress image blur.

2. Description of the Related Art Conventionally, there has been a camera that stores a shutter speed that is easily affected by camera shake and performs an operation setting for blur correction (for example, Patent Document 1).
However, the shutter speed that is easily affected by camera shake varies depending on the installation state of the camera. For this reason, a conventional camera must store a huge amount of information in order to store a shutter speed that is easily affected by camera shake in a plurality of setting states.

JP 2004-325634 A

  An object of the present invention is to provide an anti-vibration device and an optical apparatus that can set a shutter speed use prohibited band according to an installation state without requiring a large storage capacity.

  The present invention solves the problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this. In addition, the configuration described with reference numerals may be improved as appropriate, or at least a part thereof may be replaced with another configuration.

The present invention provides a vibration generator provided in an optical device that generates vibrations in the optical device, a detection unit that detects vibration of the optical device, and the vibration when the optical device is fixed to a tripod. The information on the vibration detected by the detection unit is acquired by operating the generation unit to generate vibrations on the optical device, and based on the shutter speed set before shooting and the information on the vibration, The vibration-proof device includes a control unit that sets the shutter speed.
Moreover, this invention was set as the structure of an optical apparatus provided with the said vibration isolator.

  According to the present invention, it is possible to provide a vibration isolator and an optical apparatus that can set a shutter speed use prohibition band according to an installation state without requiring a storage amount.

It is the figure which looked at the camera 1 of embodiment from the left-right direction X. FIG. It is a top view (figure seen from upper side Y2) of camera 1 of an embodiment. It is a figure explaining the structure of the camera 1 and the interchangeable lens 2 of embodiment. It is a figure explaining the vibration analysis of embodiment. It is the figure explaining the state with which the camera 1 of embodiment was mounted | worn with the tripod 3 by three aspects, and the graphs A1-A3 explaining the vibration which generate | occur | produces in the camera. It is a flowchart which shows operation | movement of the camera 1 of embodiment.

(Embodiment)
Embodiments of the present invention will be described below with reference to the drawings. In the drawings shown below, an XYZ orthogonal coordinate system is provided as necessary to facilitate explanation and understanding. In this coordinate system, X is the left-right direction viewed from the photographer at the camera position (hereinafter referred to as the normal position) when the photographer photographs a horizontally long image with the optical axis O being horizontal. Further, the vertical direction is Y at the normal position. Further, let the subject direction be Z at the normal position.

FIG. 1 is a view of the camera 1 of the embodiment as viewed from the left-right direction X. FIG.
FIG. 2 is a top view of the camera 1 according to the embodiment (viewed from the upper side Y2).
As shown in FIG. 1, the camera 1 (camera body) is a digital single-lens reflex camera. The interchangeable lens 2 is replaceably attached to the camera 1 by a mount. The interchangeable lens 2 is detachably mounted on a tripod 3 (support member). The camera 1 and the interchangeable lens 2 are integrally fixed to the tripod 3 by attaching the interchangeable lens 2 to the tripod 3.

The interchangeable lens 2 includes an anti-vibration lens 4, a detector 5, and a diaphragm 6.
The anti-vibration lens 4 is a lens that is driven to prevent image blur on the image plane. The anti-vibration lens 4 is driven by an anti-vibration lens driving unit 4a (see FIG. 3).
The detector 5 is an angular velocity sensor for detecting vibrations of the camera 1 and the interchangeable lens 2. The detector 5 outputs detection information to the control unit 21 (see FIG. 3).
The diaphragm 6 is a member for increasing or decreasing the amount of subject light guided from the photographing optical system of the interchangeable lens 2 to the image sensor 9 using several diaphragm blades. The diaphragm 6 is driven by a diaphragm driving unit 6a (see FIG. 3) including an actuator or the like.

As shown in FIGS. 1 and 2, the camera 1 includes a mirror 7, a shutter 8, an image sensor 9, a release button 12, a switching SW 13, and a mode change button 14.
As shown in FIG. 1, the mirror 7 is a quick return mirror that is driven between a reference position and a retracted position. At the reference position, the mirror 7 is disposed at an inclination of about 45 degrees with respect to the optical axis O1 in order to guide the optical axis O from the interchangeable lens 2 to the side of the pentaprism (not shown) disposed on the upper side Y2. ing. The mirror 7 is driven in the direction of arrow E according to the release operation and is disposed at the retracted position (indicated by a broken line in FIG. 1), and guides the subject light to the image sensor 9 side. The mirror 7 is driven by a mirror driving unit 7a (see FIG. 3) including an actuator or the like.

The shutter 8 is a focal plane shutter or the like that guides subject light to the image sensor 9 by running a shutter curtain according to the operation of the release button 12. The shutter 8 is driven by a shutter driving unit 8a (see FIG. 3) including an actuator or the like.
The imaging element 9 is an imaging unit for capturing an optical image of a subject imaged by the imaging optical system of the interchangeable lens 2 and acquiring imaging data. For example, a CCD, a CMOS, or the like that converts light into an electrical signal This is a photoelectric conversion element.

  As shown in FIG. 2, the release button 12, the switch SW 13, and the mode change button 14 are operation units operated by the photographer. The release button 12, the switching SW 13, and the mode change button 14 output operation information to the control unit 21 (see FIG. 3).

  The release button 12 outputs different operation information when pressed halfway or when fully pressed. As will be described later, the release button 12 is operated when acquiring vibration information or performing shooting.

The switch SW13 is an operation switch for switching between the vibration information collection operation position (Pr position) shown in FIG. 2A and the photographing execution operation position (Ex position) shown in FIG.
The mode change button 14 is an operation button for switching between a depth priority mode (aperture priority mode) and a shutter speed priority mode. Each time the mode change button 14 is pressed, the shooting mode of the camera 1 is switched between the depth priority mode and the shutter speed priority mode.

FIG. 3 is a diagram illustrating the configuration of the camera 1 and the interchangeable lens 2 according to the embodiment.
The camera 1 includes a storage unit 20 and a control unit 21.
The storage unit 20 is a storage device such as a semiconductor memory element that stores programs, information, and the like necessary for the operation of the camera 1 and the interchangeable lens 2. The storage unit 20 includes a shutter speed use prohibition band storage unit 20a and a captured image storage unit 20b.

The shutter speed use prohibition zone storage unit 20a is a storage area for storing a shutter speed use prohibition zone (described later).
The captured image storage unit 20b is a storage area that stores a captured image acquired by the image sensor 18.

The control unit 21 is a control unit for controlling the camera 1 and the interchangeable lens 2 in an integrated manner, and includes, for example, a CPU (Central Processing Unit). The control unit 21 reads and executes various programs stored in the storage unit 20 as appropriate, thereby realizing various functions according to the present invention in cooperation with the hardware described above.
The control unit 21 can communicate detection information and drive information with each detection unit and drive unit of the interchangeable lens 2 via the mount contact 11. The control unit 21 determines an exposure control value (shutter speed, aperture value, etc.) based on the output of a photometric sensor (not shown).
The control unit 21 includes a shutter speed use prohibition band control unit 21a, a vibration analysis unit 21b, and a shutter speed setting unit 21c.

The shutter speed use prohibition band control unit 21a is a control unit that calculates a shutter speed use prohibition band based on the vibration information analyzed by the vibration analysis unit 21b.
The vibration analysis unit 21 b is a control unit that analyzes vibrations in the state where the camera 1 and the interchangeable lens 2 are installed based on the output of the detector 5.
The shutter speed setting unit 21c is a control unit that sets the shutter speed in the shooting operation.
Details of processing of each control unit will be described later.

Next, vibration generated in the camera 1 will be described.
FIG. 4 is a diagram illustrating vibration analysis of the embodiment.
FIG. 4A is a diagram for explaining a vibration measuring method.
FIG. 4B is a diagram illustrating an output image 32 a in which the vibration of the camera 1 is output to the oscilloscope 32.
FIG. 4C is a graph A1 of measurement results of camera shake that occurs when the shutter speed is changed without changing the settings of the camera 1, the interchangeable lens 2, and the tripod 3.

The vibration generated in the camera 1 was measured by the following method.
(1) The camera 1 and the interchangeable lens 2 were fixed to a tripod 3 as shown in FIG.
(2) The laser light source 30 was attached to the tip of the interchangeable lens 2.
(3) The release button 12 of the camera 1 is pushed to raise the mirror 7 in the camera 1, and the vibration of the laser light 30a accompanying this movement, that is, the camera shake (attenuation rate, vibration period, amplitude) is detected by the optical position detection sensor 31. Detected with. Detection information of the optical position detection sensor 31 was output to the oscilloscope 32. As shown in the output image 32a of FIG. 4B, when the mirror 7 is raised, the camera 1 that has been stationary until then starts to vibrate.
(4) The above steps (1) to (3) were repeated at a plurality of shutter speeds, and vibrations generated at each shutter speed were measured, and a graph of measurement results in FIG. 4C was created.

  As shown in the graph A1 in FIG. 4C, the camera 1 has particularly large camera shake (amplitude) at the shutter speed in the range B1. For this reason, if the camera 1 shoots at a shutter speed within the range B1, the camera shake increases and the blur of the captured image increases. As will be described later, the camera 1 sets this range B1 to the shutter speed use prohibition band.

FIG. 5 is a diagram illustrating a state in which the camera 1 according to the embodiment is mounted on the tripod 3 in three ways, and graphs A1 to A3 illustrating vibrations generated in the camera 1.
FIG. 5A is a diagram illustrating a combination of the camera 1 and the aspect of the interchangeable lens 2 and the tripod 3.
The combination shown in FIG. 5A-1 is the same as that shown in FIG.
5A-2, the tripod 3 was shortened and the optical axis O of the camera 1 was swung to the lower side Y1.
In the combination of FIG. 5A-3, the interchangeable lens 2 having a short overall length is attached to the camera 1.

FIG. 5B is graphs A1 to A3 for explaining vibrations generated in the camera 1 in the combination of FIG.
The camera shake changes depending on whether the camera 1, the interchangeable lens 2 and the tripod 3 itself are different in model or the installation state of the tripod 3 is different. For this reason, the shutter speed use prohibition band moves, and the bandwidth also changes.
For example, the graph A2 of the combination in FIG. 5A-2 moves to a faster shutter speed than the graph A1 of the combination in FIG. 5A-1, and the camera shake is small. Along with this, the shutter speed use prohibition band moves to a faster shutter speed than the range B1 as in the range B2, and the bandwidth is narrower than the range B1.
In addition, the graph A3 of the combination in FIG. 5A-3 moves to a slower shutter speed and has a larger amplitude than the graph A1 in FIG. Accordingly, the shutter speed use prohibition band moves to a slower shutter speed than the range B1, as in the range B3, and has a wider bandwidth than the range B1.

  For this reason, if the shutter speed use prohibition band corresponding to any combination of the interchangeable lens 2 and tripod 3 is stored in advance for the camera 1 as in the prior art, the amount of information becomes enormous and the storage capacity is increased. Requires a large storage device. In addition, since the vibration of the camera 1 varies depending on the installation surface G, the conventional method cannot be set with high accuracy.

  On the other hand, in the camera 1 of the embodiment, as will be described later, after the setting of the camera 1, the interchangeable lens 2, and the tripod 3 is completed and preparation for photographing is completed, the calculation unit calculates the shutter speed use prohibition band. Thus, the shutter speed use prohibition band can be set for each setting.

FIG. 6 is a flowchart illustrating the operation of the camera 1 according to the embodiment.
As a premise of the operation of the camera 1, it is assumed that the camera 1 and the interchangeable lens 2 are fixed to the tripod 3 and ready for photographing.
At the time of shooting, the camera 1 performs shutter speed use prohibition band setting processing (S2 to S10) as a first step # 1, and then executes actual shooting processing (S11 to S20) as a second step # 2. .
In the first step # 1, the photographer performs mirror drive and shutter drive in response to the switch SW13 being set to the Pr position and operating the release button 12, and the shutter speed is based on the vibration output associated with these drive. Calculate and store the prohibited band.

  In the second step # 2, the photographing is executed in response to the switch SW 13 being switched to the Ex position and the release button 12 being operated by the photographer.

Hereinafter, the operation of the camera 1 will be described in detail.
In S1, the control unit 21 determines whether or not the switch SW13 is set to the Pr position. When it is determined that the Pr position is set (S1: YES), the control unit 21 proceeds to S2. On the other hand, when it is determined that the Pr position is not set (S1: NO), that is, the Ex position. If it is determined that it is set, the process proceeds to S11.
In S2, the control unit 21 determines whether or not the release button 12 is fully pressed. If it is determined that the button is fully pressed (S2: YES), the control unit 21 proceeds to S3. On the other hand, if it is determined that the button is not fully pressed (S2: NO), the processing from S1 is repeated.

In S <b> 3, the vibration analysis unit 21 b starts taking in vibration data of the camera 1 and the interchangeable lens 2 from the detector 5.
In S4, the shutter speed use prohibition band control unit 21a drives the mirror 7 up and places it in the retracted position, and retracts it from the photographing optical path. In addition, the shutter speed use prohibition band control unit 21a drives the diaphragm 6 and arranges the diaphragm 6 so as to have a predetermined diaphragm diameter from the open position.
In S5, the shutter speed use prohibition zone control unit 21a causes the shutter 8 to travel.

  The diaphragm 6, the mirror 7, and the shutter 8 cause the camera 1 to vibrate by the processes of S4 and S5. The detector 5 detects vibration data of the camera 1 and the interchangeable lens 2 resulting from the operations of S4 and S5, and transmits the vibration data to the vibration analysis unit 21b, which collects the vibration data.

In S6, the vibration analysis unit 21b finishes taking in vibration data by the detector 5.
In S7, the vibration analysis unit 21b analyzes the collected vibration data. The vibration analysis unit 21b obtains the relationship between the shutter speed and the camera shake as shown in the graph A of FIG. 4C from the information about the camera shake such as the attenuation rate, the amplitude, and the vibration period.
In S8, the shutter speed use prohibition band control unit 21a calculates a shutter speed with a large camera shake based on the analysis result of the vibration analysis unit 21b, and uses this as a shutter speed use prohibition band storage unit 20a. To store.

In S9, the shutter speed use prohibition zone control unit 21a drives the mirror 7 to move downward and arranges it at the reference position. In addition, the shutter speed use prohibition band control unit 21a drives the diaphragm 6 to return to the open position.
In S10, the shutter speed use prohibition zone control unit 21a charges the shutter drive unit 8a and repeats the processing from S1 (S21: NO).

By the first step # 1 of S2 to S9 described above, the camera 1 can set the shutter speed use prohibition band in the state where the camera 1 is disposed.
In the following second step # 2, photographing is performed at a shutter speed other than the calculated shutter speed use prohibition band.

To S11, the control unit 21 proceeds to the case where it is determined to be in the Ex state (S1: NO) because the switch SW13 is not set to the Pr position. The shutter speed use prohibition band control unit 21a reads the shutter speed use prohibition band stored in the shutter speed use prohibition band storage unit 20a in S8.
In S12, the control unit 21 determines whether or not the shutter speed currently set in the camera 1 is within the shutter speed use prohibition band read in S11. For example, in the depth priority mode, the current shutter speed is the shutter speed calculated by the shutter speed setting unit 21c based on the aperture value set by the photographer and the output of the photometric sensor (not shown). In the shutter speed priority mode, the shutter speed is set by the photographer.
When it is determined that the current shutter speed is within the shutter speed use prohibited band (S12: YES), the control unit 21 proceeds to S13, and when it is determined that the current shutter speed is not within the shutter speed use prohibited band. (S12: NO), the process proceeds to S16.

  In S <b> 13, the shutter speed use prohibition zone control unit 21 a determines whether the camera 1 is currently set to the depth priority mode based on the output of the mode change button 14. When the shutter speed use prohibition zone control unit 21a determines that the depth priority mode is set (S13: YES), the process proceeds to S14. On the other hand, when it is determined that the depth priority mode is not set (S13: NO) ), That is, if it is determined that the shutter speed priority mode is set, the process proceeds to S15.

In S14, the shutter speed setting unit 21c refers to an area (see range C shown in FIG. 4C) that is exposed for a longer time than the shutter speed use prohibition band read out in S11 (see range B shown in FIG. 4C). ), The shutter speed (see arrow C1 shown in FIG. 4C) is set to the shortest exposure.
As a result, the camera 1 can obtain a captured image according to the intention of the photographer giving priority to the depth of field without using the shutter speed use prohibition band.

In S15, the shutter speed setting unit 21c refers to an area (see range A shown in FIG. 4C) that is exposed for a shorter time than the shutter speed use prohibition band (see range B shown in FIG. 4C) read out in S11. ), The shutter speed (see arrow A1 shown in FIG. 4C) is set to the longest exposure.
As a result, the camera 1 can obtain a photographed image according to the intention of the photographer who prioritizes the shutter speed aiming at the stop motion effect without using the shutter speed use prohibition band.

In S <b> 16, the control unit 21 determines whether the release button 12 is fully pressed based on the output from the release button 12. If the control unit 21 determines that it is fully pressed (S16: YES), it proceeds to S17. On the other hand, if it is determined that it is not fully pressed (S16: NO), it repeats the processing from S1.
In S <b> 17, the control unit 21 rotates the mirror 7 to place it in the retracted position, and drives the diaphragm 6 to narrow the diaphragm 6 (see S <b> 4). Note that the aperture diameter in this case is the aperture value set by the photographer in the depth priority mode, whereas in the shutter speed priority mode, the aperture diameter is based on the shutter speed set by the photographer. The aperture value calculated by the control unit 21.
In S18, the control unit 21 causes the shutter 8 to travel.
In S <b> 19, the control unit 21 captures a captured image acquired by the image sensor 9.
In S20, the control unit 21 stores the captured image captured in the captured image storage unit 20b, and proceeds to S10.

  In S <b> 21, the control unit 21 determines whether or not the photographing is finished by turning off a power button (not shown). When the control unit 21 determines that the photographing is finished (S21: YES), the control unit 21 proceeds to S22 and ends the series of processes. On the other hand, when it is determined that the photographing is not finished (S21: NO), the control unit 21 starts from S1. Repeat the process.

  When the photographer changes the settings of the camera 1 (the direction of the optical axis O, the interchangeable lens 2, the tripod 3, etc.), the camera operator turns on the power again or operates the switch SW13 to restart from S1. What is necessary is just to operate the camera 1 so that a process may be repeated. Thereby, the photographer can newly set a shutter speed use prohibition zone.

As described above, the camera 1 can achieve the following effects.
(1) Since the camera shake is generated by operating the aperture 6, the mirror 7, and the shutter 8, and the shutter speed use prohibition band is provided, the shutter speed use prohibition band can be provided for each installation state of the camera 1. In addition, since it is not necessary to store the shutter speed prohibited band in advance, the storage capacity of the storage unit 20 can be reduced.

(2) The diaphragm 6, the mirror 7, and the shutter 8 are used as a vibration generating unit for calculating the shutter speed use prohibition band. Therefore, the camera 1 can perform vibration analysis by reproducing vibrations that occur during shooting.

(3) The detector 5 can also serve as an angular velocity sensor of a shake correction device for the interchangeable lens 2. For this reason, the camera 1 is not large-sized and can suppress an increase in cost.

(4) When the depth priority mode is selected, the control unit 21 sets the shutter speed so that the shortest exposure is performed within the shutter speed region of the long-time exposure than the shutter speed use prohibition band. Thus, it is possible to obtain a photographed image according to the photographer's intention giving priority to the depth of field.

(5) When the shutter speed priority mode is selected, the control unit 21 sets the shutter speed so that the longest exposure is performed within the shutter speed region of the short exposure than the shutter speed use prohibition band. Therefore, it is possible to obtain a captured image in accordance with the intention of the photographer who gives priority to the shutter speed.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made as in the modifications described later, and these are also included in the present invention. Within the technical scope. In addition, the effects described in the embodiments are merely a list of the most preferable effects resulting from the present invention, and the effects of the present invention are not limited to those described in the embodiments. It should be noted that the above-described embodiment and modifications described later can be used in appropriate combination, but detailed description thereof is omitted.

(Deformation)
(1) In the embodiment, the example in which the optical apparatus is the lens-interchangeable camera 1 has been described, but is not limited thereto. For example, the optical apparatus may be a lens barrel-integrated camera that cannot exchange lenses, as in a compact camera.

(2) In the embodiment, the example in which the diaphragm 6, the mirror 7, and the shutter 8 are used as the vibration generating unit has been described. However, the present invention is not limited to this. For example, a dedicated device may be provided as the vibration generating unit.

  DESCRIPTION OF SYMBOLS 1 ... Camera 2 ... Interchangeable lens 3 ... Tripod 4 ... Anti-vibration lens 4a ... Anti-vibration lens drive part 5 ... Detector 6 ... Aperture 6a ... Aperture drive part 7 ... Mirror 7a ... Mirror drive part 8 ... Shutter 8a ... Shutter drive part DESCRIPTION OF SYMBOLS 12 ... Release button 13 ... Switch SW 14 ... Mode change button 20 ... Memory | storage part 20a ... Shutter speed use prohibition zone memory | storage part 21 ... Control part 21a ... Shutter speed use prohibition zone control part 21b ... Vibration analysis part 21c ... Shutter speed setting part

Claims (6)

A vibration generator provided in an optical device and generating vibrations in the optical device;
A detection unit for detecting vibration of the optical device;
When the optical device is fixed to a tripod, the vibration generating unit is operated to generate vibrations by obtaining the vibration information detected by the detecting unit, and set before photographing And a control unit that sets a shutter speed at the time of photographing based on the shutter speed and the vibration information. The vibration isolator according to claim 1,
The vibration generating unit includes at least one of an actuator, a lens diaphragm, a mirror, and a shutter;
Anti-vibration device characterized by In the vibration isolator according to claim 1 or 2,
The detection unit is an angular velocity sensor of a shake correction device;
Anti-vibration device characterized by In the vibration isolator of any one of Claim 1- Claim 3,
When the depth priority mode is selected, the control unit sets the shutter speed at the time of shooting to be longer than the shutter speed set before the shooting based on the vibration information. Setting,
Anti-vibration device characterized by In the vibration isolator of any one of Claim 1 to Claim 4,
When the shutter speed priority mode is selected, the control unit sets the shutter speed at the time of shooting to be shorter than the shutter speed set before the shooting based on the vibration information. Set to
Anti-vibration device characterized by   An optical apparatus comprising the vibration isolator according to any one of claims 1 to 5.

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