JP2014021405A - Zoom lens apparatus - Google Patents

Abstract

When an image sensor is small, it is difficult to focus only the subject and blur the background even if the iris is opened.
A confusion circle diameter setting means for setting a focus state of a background, a macro drive amount calculation means for calculating a drive amount of the macro section based on an output and aberration data of the confusion circle diameter setting means, Focus correction position calculation means for calculating the correction position of the focus section based on the output of the macro drive amount calculation means, and the macro section is moved to the focus correction position calculation means according to the output of the macro drive amount calculation means. The focus unit is driven in accordance with the output of.
[Selection] Figure 1

Description

  The present invention relates to a zoom lens apparatus having a macro function.

  In recent years, there has been an increase in the screen size and image quality of televisions and monitors, and there has been an increasing demand for higher image quality for projected images. In response to this demand for higher image quality, a high-performance zoom lens with an image blur correction function and an autofocus function has been developed as a broadcast zoom lens. On the other hand, camera equipment such as cameras and lenses have been rapidly miniaturized, and in various situations, users can easily shoot high-quality video and obtain various video effects.

  In order to further enhance the video effect, an imaging method has been proposed in which only the subject is focused and the background is blurred to make the presence of the subject more prominent (see Patent Document 1).

Japanese Patent No. 0361500 specification

  However, in the conventional photographing method described above, the blur effect on the background is obtained by opening the iris and reducing the depth of field. For this reason, a change in luminance occurs as the iris is driven to the open side, and it is essential to adjust the luminance by adjusting the gain of the camera. Furthermore, due to the recent downsizing of the image sensor due to the downsizing of the camera, the depth of field becomes deeper, and it may be difficult to blur the background simply by opening the iris as in the past. It was desired.

In a zoom lens apparatus including a macro unit and a macro driving unit,
A confusion circle diameter setting means for setting the in-focus state of the background, a macro drive amount calculation means for calculating the drive amount of the macro section based on the output and aberration data of the confusion circle diameter setting means, and the macro drive amount calculation Focus correction position calculation means for calculating the correction position of the focus section based on the output of the means, and the macro section according to the output of the macro drive amount calculation means according to the output of the focus correction position calculation means And driving the focus section.

  According to the present invention, even when the depth of field is deep, such as when the image sensor is small, an effect of blurring the background in a state in which the subject is in focus can be obtained.

It is a block diagram of a 1st Example. It is a flowchart for demonstrating operation | movement of a 1st Example. It is a block diagram of the 2nd Example. It is a flowchart for demonstrating operation | movement of a 2nd Example. It is a block diagram of a 3rd Example. It is a flowchart for demonstrating operation | movement of a 3rd Example. It is a figure which shows the ranging part arrangement | positioning in a screen. It is a flowchart for demonstrating operation | movement of a 3rd Example.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings of FIGS.
FIG. 1 is a configuration diagram of a zoom lens in a first embodiment to which the present invention can be applied.

  Reference numeral 100 denotes a zoom lens that can be attached to and detached from a television camera (not shown), 101 denotes a focus unit for adjusting the focus of the subject image, and 102 denotes a focus position detection unit for detecting the position of the focus unit 101. Reference numeral 103 denotes a focus motor for driving the focus unit 101, and reference numeral 104 denotes a focus drive circuit for rotating the focus motor 103.

  Reference numeral 105 denotes a zoom unit having a zooming action, 106 a zoom position detection unit for detecting the position of the zoom unit 105, 107 a zoom motor for driving the zoom unit, and 108 for rotating the zoom motor 107. This is a zoom drive circuit.

  Next, 109 is an iris unit, 110 is an iris position detection unit for detecting the position of the iris unit 109, 111 is an iris motor for driving the iris unit, and 112 is an iris drive for rotating the iris motor 111. Circuit.

  113 is a macro section for adjusting the flange back, 114 is a macro section position detecting section for detecting the position of the macro section 113, 115 is a macro motor for driving the macro section, and 116 is a macro motor 115. It is a macro drive circuit for rotating.

  Reference numeral 117 denotes a non-volatile memory that stores data for calculating the focal length and subject distance, data for calculating aberration data from the focal length and subject distance, and the like. A lens control unit 118 controls the focus unit 101 and the like, and a macro drive amount calculation unit 119 calculates a drive amount of the macro unit 113. Reference numeral 120 denotes a focus correction position calculation unit for correcting the focus control signal based on the output of the macro drive amount calculation unit and data stored in the nonvolatile memory 117, and 121 is for communicating with the controller 200 described later. It is a communication part.

  Subsequently, reference numeral 200 denotes a controller that can be attached to the zoom lens 100. 201 is a communication unit for communicating with the zoom lens 100, 202 is a focus operation unit for setting the drive amount of the focus unit 101, and 203 is a macro switch for turning on / off the drive of the macro unit 113. Reference numeral 204 denotes a blur amount setting unit for setting a background blur amount.

  In this embodiment, the lens control unit 118, the macro drive amount calculation unit 119, and the focus correction position calculation unit 120 are realized by the lens CPU.

  The operation of the lens CPU 130 will be described below along the flowchart of FIG.

When power is supplied to a camera (not shown) and power is supplied to the zoom lens 100, the lens CPU 130 proceeds to S101, and initializes each part of the zoom lens 100 such as the focus unit 101 and the zoom unit 105. The macro interlock flag M_flag is also initialized to 0. In S102, the operation amount a of the focus operation unit 202 is input, and the focus control data F _cnt is calculated using the equation (1). In S103, the operation amount b of the zoom operation unit (not shown) is input, (2) The zoom control data Z _cnt is calculated using the formula.

F _cnt = K ₁ × a (K ₁ is an arbitrary constant) (1)
Z _cnt = K ₂ × b (K ₂ is an arbitrary constant) (2)

In step S104, the lens CPU 130 inputs an operation amount c of an iris operation unit (not shown), calculates iris control data I _cnt using the equation (3), and proceeds to step S105.

In S105, the state of the macro switch 203 is determined. If the macro switch 203 is ON, the process proceeds to S106. In S106, the CPU 130 sets the macro interlock flag M_flag to 1, inputs the state of the blur amount setting unit 204 in S107, calculates the blur amount setting value R _cnt using the equation (4), and proceeds to S110.

I _cnt = K ₃ × c (3)
R _cnt = K ₄ × d (4)

By calculating the blur amount setting value according to the state of the blur amount setting unit 204 in this way, it is possible to arbitrarily set the blur amount intended by the operator.

On the other hand, if the macro switch 203 is OFF in S105, the process proceeds to S108, the macro interlock flag M_flag is cleared to 0, and the blur amount setting value R _cnt is set to 0 in S109, and the process jumps to S110.

Next, in S110, the state of the macro interlock flag M_flag is determined. If the macro interlock flag M_flag is set to 1, the process proceeds to S111. In S111, the function g () is input from the nonvolatile memory 117, the focal length f is calculated using the equation (5) and the zoom control data _Zcnt, and the process _proceeds to S112.

f = g (Z _cnt ) (5)

The CPU 130 proceeding to S112 inputs the function h () from the nonvolatile memory 117, calculates the subject distance Obj using the equation (6) and the focus control data F _cnt, and proceeds to S113.

Obj = h (F _cnt ) (6)

In S113, the macro driving amount calculation coefficient Coeff corresponding to the focal length f and the object distance Obj inputted from the non-volatile memory 117, using the equation (7) and the blur amount set value R _cnt, calculating the macro-control data M _cnt To do.

M _cnt = R _cnt × Coeff (Obj, f) (7)

In S114 Subsequently, created based on the aberration, enter the focus correction position data corresponding to the object distance Obj and macro-control data M _cnt from the table data stored in the nonvolatile memory 117, the focus control data F _cnt re Set. Then, the process proceeds to S116.

  In this way, the macro unit 113 is driven to a position corresponding to the blur amount setting unit 204 and the focus control data is corrected, thereby focusing on the subject at the subject distance Obj and blurring the background at a far distance from the subject. It becomes possible. In this case, since the iris unit 109 is not driven at this time, the brightness of the image can be maintained. Therefore, it is not necessary to correct the image signal with a camera (not shown) in order to adjust the luminance.

In S110, if the macro interlock flag M_flag is cleared, the process proceeds to S115, the macro-control data M _cnt is set to 0, it jumps to S116.

Next, in S116, the iris position data I _pos is input from the iris part position detector 110, the iris drive signal _Iout is calculated using the equation (8), output to the iris drive circuit 112, and the process proceeds to S117.

I _out = K ₅ × (I _cnt −I _pos ) (8)

In S117, the zoom position data Z _pos is input from the zoom unit position detection unit 106, the zoom drive signal Z _out is calculated using the equation (9), is output to the zoom drive circuit 108, and the process proceeds to S118.

Z _out = K ₆ × (Z _{cnt −Z pos} ) (9)

In S118, the focus position data F _pos is input from the focus unit position detection unit 102, the focus drive signal _Fout is calculated using the equation (10), is output to the focus drive circuit 104, and the process proceeds to S119.

_{F out = K 7 × (F} cnt - F pos) (10)

In S119, the macro position data M _pos is input from the macro position detection unit 114, the macro drive signal M _out is calculated using the equation (11), and is output to the macro drive circuit 116.

M _out = K ₈ × (M _cnt −M _pos ) (11)

Thereafter, S102 to S119 are repeatedly executed until the power of a camera (not shown) is turned off. As described above, when the macro switch 203 is ON, the macro unit 113 is driven according to the blur amount setting unit 204 and the focus unit 101 is driven to the correction position, so that the subject is focused and the background image is displayed. It becomes possible to blur.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings of FIGS.
FIG. 3 is a configuration diagram of a zoom lens in a second embodiment to which the present invention can be applied. The same components as those in the first embodiment are denoted by the same reference numerals. Reference numeral 300 denotes a controller that can be attached to the zoom lens 100, and includes a communication unit 201, a focus operation unit 202, and a blur amount setting unit 204. The operation of the lens CPU 130 will be described below along the flowchart of FIG. In FIG. 4, the same processes as those in FIG.

  When power is supplied to the camera (not shown) and power is supplied to the zoom lens 100, the lens CPU 130 proceeds to S101. Since S101 to S104 are the same as those in the first embodiment, description thereof is omitted.

  In S201, the lens CPU 130 determines the operation amount a of the focus operation unit 202. If the operation amount a has changed, the lens CPU 130 proceeds to S108. Since S108 and S109 are the same as those in the first embodiment, description thereof will be omitted. In S201, the operation amount a of the focus operation unit 202 is determined. If the operation amount a has not changed, the process proceeds to S106.

  Since S106, S107, and S110 to S119 are the same as those in the first embodiment, description thereof will be omitted.

  Thereafter, S102 to S119 and S201 are repeatedly executed until the power of the camera (not shown) is turned off. When the focus operation amount does not change as described above, the macro unit 113 is driven in accordance with the blur amount setting unit 204 and the focus unit 101 is driven to the correction position, so that the subject is focused and the background is adjusted. It is possible to blur the image.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings of FIGS.

  FIG. 5 is a configuration diagram of a zoom lens according to a third embodiment to which the present invention can be applied. The same components as those in the first embodiment are denoted by the same reference numerals. Reference numeral 400 denotes a zoom lens, 401 denotes an image blur correction unit for decentering the optical axis of the zoom lens 400, and 402 denotes an image blur correction unit position detection unit for detecting the position of the image blur correction unit 401. Reference numeral 403 denotes an image blur correction motor that drives the image blur correction unit 401. Reference numeral 404 denotes an image blur correction drive circuit that controls the image blur correction motor. Reference numeral 405 denotes a distance measuring unit for measuring the distance to the subject being photographed. Reference numeral 406 denotes an image blur correcting unit correction position calculation for correcting the position of the image blur correcting unit according to the output of the distance measuring unit 405. Part.

  Next, reference numeral 500 denotes a controller that can be attached to the zoom lens 400, and reference numeral 501 denotes a shot switch that sets ON / OFF of the shot function.

  In this embodiment, the lens control unit 118, the macro drive amount calculation unit 119, the focus correction position calculation unit 120, and the image blur correction unit correction position calculation unit 406 are realized by the lens CPU 430.

  The operation of the lens CPU 130 will be described below with reference to the flowchart of FIG. In FIG. 6, the same processes as those in FIG.

  When power is supplied to the zoom lens 400, the lens CPU 430 proceeds to S301, initializes the positions of the focus unit 101 and the image blur correction unit 401, and initializes each part of the zoom lens 400 such as clearing the shot flag to zero.

  Since S102 to S104 are the same processes as those in the first embodiment, description thereof will be omitted. In S302, the state of the shot switch 501 is determined. If the shot function is ON, the process proceeds to S303, and the shot flag S_flag is set to 1. If the shot function is OFF, S_flag is cleared to 0 in S304.

The CPU 430 proceeding from S303 or S304 to S305 determines the state of the shot flag S_flag, and proceeds to S106 if the shot flag S_flag is 1. Since S106 and S107 are the same as those in the first embodiment, description thereof is omitted. Next, in S306, the focal length f is calculated using the zoom shot position Z _shot received from the controller 500 and Equation (21), and in S307, the subject distance Obj is calculated using the focus shot position F _shot and Equation (22). To do.

f = g (Z _shot ) (21)
Obj = h (F _shot ) (22)

In S308, a plurality of object distances in the screen are calculated using the output of the distance measuring unit 405. Here, the relationship between the screen and the distance measurement range of the distance measurement unit 405 in this embodiment is shown in FIG. In this embodiment, as shown in FIG. 7, distance measuring sensors are arranged so that the distances to the subjects at three places in the screen can be measured. The sensor 1 measures the subject on the left side of the screen, the sensor 2 measures the distance of the subject on the center of the screen, the sensor 3 measures the distance of the subject on the right side of the screen, sets the results in the buffers Obj1s, Obj2s, Obj3s, and proceeds to S113. Since S113 and S114 are the same as those in the first embodiment, a description thereof will be omitted.

Next, in S309, calculates the image blur correction control data IS _cnt with the output e of the vibration sensor (not shown) to (23), the image blur correction control data IS _cnt according to the subject position of the screen S310 Perform correction calculation.

IScnt = K9 × e (23)

Here, the process of S310 will be further described with reference to FIG.

The CPU 430 proceeding to S310 compares the subject distance Obj1s on the left side of the screen with the target subject distance Obj in S351. When the subject distance Obj1s on the left side of the screen is equal to the target subject distance Obj, the image blur correction control data IS _cnt is corrected using the formula (24) that proceeds to S352.

IS _cnt = IS _cnt + Coeff (Obj, f) (24)

If the subject distance Obj1s on the left side of the screen is not equal to the target subject distance Obj in S351, the process proceeds to S353, where the subject distance Obj3s on the right side of the screen is compared with the target subject distance Obj. When the subject distance Obj3s on the right side of the screen is equal to the target subject distance Obj, the image blur correction control data IS _cnt is corrected using the formula (25) that proceeds to S354. If the subject distance Obj3s on the right side of the screen is not equal to the target subject distance Obj in S353, nothing is done and the processing in FIG. 8 is completed and the processing proceeds to S311 in FIG.

IS _cnt = IS _cnt − Coeff (Obj, f) (25)

In this way, when the subject image is arranged around the screen, the image blur correction unit 401 is driven to reduce the aberration near the subject image and enable focusing. At the same time, it is possible to enhance the blurring effect by reflecting the aberration on the background image.

In step S <b> 311, the position F _pos of the focus unit 101 is input from the focus unit position detection unit 102 and compared with the focus control data F _cnt . If the position F _pos of the focus unit 101 is different from the focus control data F _{cnt in} S311, the process jumps to S116 without doing anything. If the position F _pos of the focus unit 101 is equal to the focus control data F _{cnt in} S311, the process proceeds to S312 and the position M _pos of the macro unit 113 is input and compared with the macro control data M _cnt . In S312, when the position M _pos and macro-control data M _cnt macro 113 are different jumps to S116 without doing anything. In S312, if the position M _pos and macro-control data M _cnt macro portion 113 are equal, it determines that the shot operation is completed, together cleared the shot flag S_flag and macro interlock flag M_flag at S313.

Since S116 to S119 are the same as those in the first embodiment, description thereof will be omitted. The CPU 430 proceeding from S119 to S314 inputs the position IS _pos of the image blur correction unit 401, calculates the image blur correction unit drive signal IS _out using the equation (26), and outputs it to the image blur correction drive circuit 404. To do.

  On the other hand, if the shot flag S_flag is 0 in S305, the macro interlock flag M_flag is cleared to 0 in S315, and the process jumps to S116. Thereafter, S102 to S119 and S302 to S315 are repeatedly executed until the power of the camera (not shown) is turned off.

  As described above, when the shot function is executed, the macro unit 113 is driven according to the blur amount setting unit 204 and the focus unit 101 is driven to the correction position, so that the background can be blurred while focusing on the subject. It becomes possible. If the distance measuring unit 405 determines that the subject is arranged around the screen, the image blur correcting unit is further driven to reduce the aberration near the subject, and the subject placed around the screen However, the background can be blurred while the subject is in focus.

DESCRIPTION OF SYMBOLS 100 Zoom lens 101 Focus part 102 Focus position detection part 103 Focus motor 104 Focus drive circuit 105 Zoom part 106 Zoom position detection part 107 Zoom motor 108 Zoom drive circuit 109 Iris part 110 Iris position detection part 111 Iris motor 112 Iris drive circuit 113 Macro Unit 114 macro unit position detection unit 115 macro motor 116 macro drive circuit 117 nonvolatile memory 118 lens control unit 119 macro drive amount calculation unit 120 focus correction position calculation unit 121 communication unit 130 lens CPU
200 controller 201 communication unit 202 focus operation unit 203 macro switch 204 blur amount setting unit

Claims (3)

In a zoom lens apparatus including a macro unit and a macro driving unit,
A confusion circle diameter setting means for setting the in-focus state of the background, a macro drive amount calculation means for calculating the drive amount of the macro section based on the output and aberration data of the confusion circle diameter setting means, and the macro drive amount calculation Focus correction position calculation means for calculating the correction position of the focus section based on the output of the means, and the macro section according to the output of the macro drive amount calculation means according to the output of the focus correction position calculation means And a zoom lens apparatus for driving the focus section.   Distance measuring means for measuring the distance to a plurality of subjects in the screen, focus correction position calculation for calculating the correction position of the focus section based on the output of the macro drive amount calculating means and the output of the distance measuring means The zoom lens apparatus according to claim 1, further comprising: means.   3. The zoom lens apparatus according to claim 2, further comprising an image blur correction unit correction position calculating unit that calculates a correction position of the image blur correction unit based on the aberration data.