JP2005003968A - Camera, interchangeable lens and camera body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately drive a driving motor even when various driving motors of various driving systems are used by an interchangeable lens as for a camera body, an interchangeable lens and a camera equipped with them. <P>SOLUTION: The interchangeable lens 1 is equipped with a lens barrel 2, a photographic lens 3 arranged in the lens barrel 2, the driving motor 5 driving the lens 3, and an EEPROM 8 in which data for controlling the movement of the lens 3 is stored. The camera body 100 receives the data for controlling the movement stored in the EEPROM 8 of the lens 1 mounted in the camera body 100, and controls the movement of the lens 1 in accordance with the data for controlling the movement. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a camera body, an interchangeable lens detachably attached to the camera body, and a camera including the camera body and the interchangeable lens.
[0002]
[Prior art]
For example, a camera using different types of interchangeable lenses such as a wide-angle lens, a standard lens, a telephoto lens, and a macro lens is known. As described above, when a plurality of different types of interchangeable lenses are exchanged and used, for example, characteristics such as aberration are different for each interchangeable lens, and thus correction needs to be performed.
[0003]
Conventionally, as a camera using such an interchangeable lens, focus adjustment data specific to the interchangeable lens is stored in a memory built in the interchangeable lens, and the focus adjustment data unique to the interchangeable lens is used to focus. A technique for correcting the position is disclosed (for example, see Patent Document 1). In Patent Document 1, as data unique to the interchangeable lens, data representing an image surface curvature of the interchangeable lens (aberration that forms an image on the curved image surface when focused on a flat surface) is cited.
[0004]
[Patent Document 1]
JP-A-6-130283 (summary, FIG. 1)
[0005]
[Problems to be solved by the invention]
In the case of an interchangeable lens, there are various types such as a built-in heavy photographic lens such as a telephoto lens, a built-in lighter photographic lens, and various drive motors for driving the photographic lens. In the above-mentioned Patent Document 1, the aberration of the photographing lens with a built-in interchangeable lens is mentioned, but the photographing lens driving method itself is not shown.
[0006]
SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a camera capable of correctly driving various drive motors of various drive systems depending on the interchangeable lens, and an interchangeable lens and a camera body compatible with the camera. The purpose is to do.
[0007]
[Means for Solving the Problems]
The camera of the present invention that achieves the above object includes a camera body and an interchangeable lens that is detachably attached to the camera body, and performs imaging by capturing a subject incident through the interchangeable lens attached to the camera body. In the camera
The interchangeable lens
A lens barrel,
A photographic lens deployed in this lens barrel;
A data storage unit disposed in the lens barrel and storing data for movement control of the photographing lens;
The camera body receives the movement control data stored in the data storage unit of the interchangeable lens attached to the camera body, and performs the lens movement control of the photographing lens according to the movement control data It is provided with.
[0008]
In the camera of the present invention, a data storage unit that stores movement control data of the photographing lens is provided in the lens barrel, and the movement control data stored in the data storage unit is received in the camera body, and the movement control is performed. Since the lens movement control of the photographic lens is performed according to the use data, for example, the lens drive control can be performed by optimally setting the driving method, the driving speed, etc. according to the interchangeable lens.
[0009]
Here, in the camera of the present invention, the camera body may receive movement control data from the interchangeable lens at the timing when the interchangeable lens is attached to the camera body, or alternatively, the interchangeable lens is received by the camera body. The movement control data may be received from the interchangeable lens at the timing when the camera body is turned on in the state where the camera is mounted.
[0010]
In the camera of the present invention, the interchangeable lens includes a drive motor that drives a photographing lens that is pulse-driven to form the interchangeable lens, and the data for movement control includes driving of the drive motor. It is preferable to include data on the number of pulses for controlling the amount of movement of the photographing lens by determining the method data and the amount of rotation of the drive motor.
[0011]
Further, the interchangeable lens of the present invention is an interchangeable lens that is detachably attached to the camera body and is connected to the camera body to transmit a subject image to the camera body for shooting.
A lens barrel,
A photographic lens deployed in the lens barrel;
A data storage unit disposed in the lens barrel and storing movement control data of the photographing lens;
The data storage unit is characterized in that the stored movement control data is passed to the camera body in response to a request from the camera body to which the interchangeable lens is attached.
[0012]
In the interchangeable lens of the present invention, a data storage unit storing movement control data of the photographing lens is provided in the lens barrel, and the stored data is passed to the camera body in response to a request from the camera body. When shooting with the interchangeable lens mounted on the camera body, the camera body can receive appropriate movement control of the photographing lens provided in the interchangeable lens.
[0013]
Furthermore, the camera body of the present invention is detachable with an interchangeable lens, and in a camera body that takes a picture by capturing a subject image incident through the attached interchangeable lens,
The interchangeable lens is
A lens barrel,
A photographic lens disposed in the lens barrel;
A data storage unit provided in the lens barrel and storing data for movement control of the photographing lens;
The camera body receives the movement control data stored in the data storage unit of the interchangeable lens mounted on the camera body, and performs the lens movement control of the interchangeable lens according to the movement control data. It is provided with.
[0014]
In the camera body of the present invention, data stored in the data storage unit storing the movement control data of the photographic lens provided in the lens barrel is received, and the lens movement of the photographic lens is controlled according to this data. Therefore, when the interchangeable lens is mounted on the camera body and photographing is performed, the photographing lens provided in the interchangeable lens can be appropriately moved and controlled.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described.
[0016]
1, 2, and 3 are a front view, a rear view, and a side view, respectively, of a digital camera showing an embodiment of the present invention.
[0017]
A digital camera 10 shown in FIG. 1 has a removable interchangeable lens 1 attached to the front surface of a camera body 100. The details of the interchangeable lens 1 will be described later.
[0018]
A release button 12 is provided above the digital camera 10. When the release button 12 is fully pressed, an instruction to start shooting is transmitted to a signal processing unit (described later) inside the digital camera.
[0019]
On the back surface of the digital camera 10 shown in FIG. 2, an operation switch group 21 is provided for performing various operations when the user uses the digital camera 10.
[0020]
The operation switch group 21 includes a power switch 102 for operating the digital camera, a shooting / playback switching lever 103 for freely switching between shooting and playback, an execution key 106a, a cancel key 106b, a cross key 107, and a flash light emitting unit. 104 pop-up switch 108 and the like. A display unit 107a is provided inside the cross key 107. The display unit 107a displays items of a selection menu displayed on a liquid crystal display unit (hereinafter referred to as LCD), which will be described later. Items can be selected by the cross key 107.
[0021]
The digital camera 10 can be switched between shooting and playback by a shooting / playback switching lever 103. When shooting, the user switches the shooting / playback switching lever 103 to the shooting side 103a to play back. When performing, the photographing / reproduction switching lever 103 is switched to the reproduction side 103b.
[0022]
As shown in FIG. 2, the digital camera 10 is provided with an LCD 14 for displaying images and menus on the back. Selection of items displayed on the menu displayed on any of the LCDs 14 is performed by the cross key 107.
[0023]
As shown in FIG. 3, the interchangeable lens 1 includes a lens barrel 2 and a photographing lens 3 disposed in the lens barrel 2. The taking lens 3 has a front group lens 3a and a rear group lens 3b.
[0024]
Further, the interchangeable lens 1 is provided with a drive motor 5 for moving the photographing lens 3 in the optical axis direction. The drive motor 5 receives a driving pulse from the camera body 100 side and receives the driving pulse of the photographing lens 3. The rear group lens 3b is moved in the optical axis direction for focus adjustment.
[0025]
Further, an EEPROM 8 that is a storage element is provided in the lens barrel 2. The EEPROM 8 stores lens movement control data for the interchangeable lens. The lens movement control data is data for moving the photographing lens 3 for adjusting the focus. Specifically, the lens movement control data includes the number of feed pulses of the drive motor (stepping motor) 5 and the drive system of the drive motor (1 (Phase excitation or two-phase excitation) is stored.
[0026]
The lens movement control data stored in the EEPROM 8 is transmitted to the camera body side as will be described later, and is used for drive control of the drive motor 5 by the CPU 111 provided in the camera body.
[0027]
FIG. 4 is a block diagram showing a signal processing circuit provided in the digital camera of the first embodiment.
[0028]
In the digital camera 10 of the present embodiment, all processing is controlled by the CPU 111, and under the control of the CPU 111, processing of image data obtained by the solid-state imaging device (hereinafter referred to as CCD) 110 is performed by the DSP 112. The CPU 111 and the DSP 112 are connected by a bus (not shown), and data is exchanged via this bus. An SDRAM 113 and a FLASH ROM 114 are connected to the CPU 111. The SDRAM 113 stores image data to be processed by the DSP 112, and the FLASH ROM 114 stores a program for causing the CPU 111 to execute processing.
[0029]
An electric signal corresponding to the operation of the operation switch group 21 including various keys and switches shown in FIG. 1 is input to the input unit of the CPU 111. The switch group 21 includes the power switch 102, the shooting / playback switching lever 103, the display key 1051, the execution key 106a, the cancel key 106b, the upper key 1071, the right key 1072, the lower key 1073, and the left key 1074 shown in FIG. There are a cross key 107 composed of these four keys, a shutter switch that operates in synchronization with the release button 12, and the like. The shutter switch is provided with two contacts so that the half-pressed state and the fully-pressed state of the release button 12 can be distinguished, and the half-pressed state of the release button 12 indicates to the CPU 111 that the shooting standby state is indicated. Be recognized.
[0030]
Further, the digital camera 10 of the present embodiment is configured such that a display menu can be displayed on the screen of the LCD 14, and an item displayed on the menu is selected by the cross key 107.
[0031]
With the cross key 107, one of a plurality of items in a selection menu displayed on the LCD 14 can be selected. Of the four keys of the cross key shown in FIG. 1, when the up key 1071 is pressed, the cursor displayed on the screen of the LCD 14 moves upward, and when the right key 1072 is pressed, the cursor moves right. It is configured.
[0032]
When these keys 1071 to 1074 are pressed, the CPU 111 recognizes that the keys 1071 to 1074 have been pressed, and the CPU 111 has pressed any one of the four keys 1071 to 1074. Based on the above, an instruction to move the cursor is transferred to the LCD 14 via the bus. Then, the cursor moves to one of the displayed items, and one of these items is selected by the moved cursor.
[0033]
If the execution key 106a is pressed while the cursor is placed on any of the items, the item is executed. Therefore, the user can select any of a plurality of items in the selection menu with the cursor displayed on the LCD 14.
[0034]
When the shooting / playback switching lever 103 is switched to the playback side 103b, playback from the recording medium is performed. At this time, no processing is performed even if a signal from a release button or the like for giving an instruction to perform photographing is input.
[0035]
Next, the output unit of the CPU 111 will be described. The output unit of the CPU 111 includes a timing generator (hereinafter referred to as TG) 116, a drive motor 5 provided in the interchangeable lens 1 for driving the photographing lens 3, and a flash light emitting device 104a that causes the flash light emitting unit 104 to perform flash light emission. Is connected.
[0036]
When shooting, a subject image is displayed on the LCD 14 in accordance with the movement of the subject. While viewing the displayed image of the subject, the user performs framing, and shooting is performed when the release button 12 is fully pressed. When the release button 12 is fully pressed, the CPU 111 outputs a signal for instructing the start of shooting to the TG 116. In response to this instruction, the TG 116 supplies a signal notifying the CCD 110 that the release button 12 has been pressed. In response to this signal, the CCD 110 outputs image data captured by the CCD 110 as an RGB signal when the release button 12 is fully pressed.
[0037]
An imaging signal composed of RGB signals obtained by the CCD 110 is supplied to the CDS and A / D unit 119. Noise is reduced by the CDS and A / D unit 119 and then converted into a digital signal, which is supplied to the DSP 112 as a digital RGB signal. The DSP 112 includes various signal processing units such as an image signal processing unit, a compression processing unit, an AE (Auto Exposure) detection unit, an AWB (Auto White Balance) detection unit, a video encoder, and an audio signal processing unit.
[0038]
A series of processing is performed on the image data composed of RGB signals obtained by the CCD 110 by the DSP 112, and the processed image data is output to an output device such as the LCD 14 and the recording medium 130. The above is the flow of the photographing signal obtained by the CCD 110.
[0039]
Next, the flow of image data when the above-described shooting / playback switching lever 103 is switched to the shooting side 103a and shooting is performed will be described.
[0040]
When shooting is performed, the shooting / playback switching lever 103 connected to the input unit of the CPU 111 is switched to the shooting side 103a.
[0041]
In such a digital camera 10, the subject image in the direction in which the photographing lens is directed is always displayed as a through image on the screen of the LCD 14 even when the release button 12 is not pressed. In the displayed through image, image data composed of RGB signals read from the CCD 110 at predetermined intervals is converted into YC signals by the image signal processing unit in the DSP 112, and the YC signals pass through the video encoder in the DSP 112. And supplied to the LCD 14. When such a through image is displayed, the DSP 112 performs camera-specific processing such as exposure adjustment and focus adjustment for each through image.
[0042]
If the subject desired by the user is displayed as a through image on the screen of the LCD 14, the release button 12 is fully pressed by the user. When the release button 12 is fully pressed by the user, the CPU 111 issues a shooting start instruction to the TG 116. In response to this start instruction, the CCD 110 outputs RGB signals. As described above, the release button 12 has two operation modes of half-press and full-press. Even when the release button 12 is fully pressed at once, the state where the release button 12 is half-pressed is recognized by the CPU 111, and for a moment. When it is half-pressed, it is in shooting standby.
[0043]
The output RGB signal is converted into a digital signal by the CDS and A / D conversion unit 119, guided to the DSP 112 side by the image input controller in the DSP 112, and the guided RGB signal is SDRAM 113 via the bus in the DSP 112. And the RGB signal of the digital signal is written in the SDRAM 113. When the acquisition of the RGB signals corresponding to all the image data is completed, the RGB signals are read from the SDRAM 113 and supplied to the DSP 112. The DSP 112 performs conversion from RGB signals to YC signals, and the image data compressed in the DSP 121 is supplied to the recording medium 130 via the interface 120, and the image data is recorded as a JPEG compressed file on the recording medium 130. The
[0044]
The DSP 112 and the CPU 111 are connected by a bus, and exchange of addresses and data is performed via this bus. Various registers are prepared in the CPU 111, and the contents of these registers are rewritten according to the progress of processing of each signal processing unit. In the CPU 111, the contents of this register are read and processing according to the procedure of the program stored in the FLASH ROM 114 is performed.
[0045]
The above is the flow of image data until recording is performed on the recording medium 130 when shooting is performed with the digital camera 10 of the present embodiment.
[0046]
As described below, the digital camera of the present invention reads movement control data for the photographing lens 3 from the EEPROM 8 of the interchangeable lens 1 and stores it in the SDRAM 113. At the time of photographing, the movement control data is read from the SDRAM 113 for focus adjustment. It is what I do. In the present embodiment, the CPU 111, the SDRAM 113, etc. operate in the low power consumption mode even when the power is off. The CPU 111 and the SDRAM 113 automatically operate in the normal operation when necessary, and then shift to the low power consumption mode again after the operation. It has become.
[0047]
FIG. 5 is a flowchart showing the operation at the time of lens replacement.
[0048]
First, when the lens is exchanged, when the interchangeable lens 1 is newly attached to the camera body 100 (step S1), the contact 122 (see FIG. 3) provided in the camera body 100 and the EEPROM 8 are electrically connected. The EEPROM 8 and the CPU 111 are electrically connected through the contact 122. Thereby, the movement control data stored in the EEPROM 8 is read out by the CPU 111, stored in the SDRAM 113, and stored in place of the movement control data of another interchangeable lens previously stored, that is, resetting is performed. This is done (step S3).
[0049]
As described above, the EEPROM 10 storing the movement control data of the photographing lens 3 is provided in the lens barrel 2 of the interchangeable lens 1, and the SDRAM 113 in the camera body 100 receives the movement control data stored in the EEPROM 10. Since the CPU 111 in the camera body 100 controls the lens movement of the photographic lens 3 in accordance with the movement control data, even if a different type of interchangeable lens is attached, Suitable lens movement control can be performed.
[0050]
Next, a second embodiment of the present invention will be described.
[0051]
In the first embodiment described above, the movement control data of the photographic lens stored in the EEPROM 8 incorporated in the interchangeable lens is moved to the camera body side when the interchangeable lens is attached. This second embodiment Then, the movement control data is transferred to the camera body side at the power-on timing.
[0052]
FIG. 6 is a flowchart of a process for reading movement control data of the interchangeable lens when the power is turned on.
[0053]
When the camera is turned on, a program for causing the CPU 111 to execute processing is downloaded from the FLASH ROM 114 (step S10), and this program is stored in the SDRAM 113 (step S11). Next, the movement control data in the EEPROM 8 is read by the CPU 111 (step S12) and stored in the SDRAM 113 (step S13). Thereafter, the normal start-up process of the camera is performed (step S14), and the photographing standby state is established. It becomes. As described above, when the movement control data is read when the power is turned on, it is not necessary to operate the CPU 111, the SDRAM 113, or the like when the power is turned off, thereby further reducing power consumption.
[0054]
Although the lens movement control data has been described here as data for adjusting the focus of the photographic lens 3, in the case of an interchangeable lens employing a photographic lens with adjustable focal length as the photographic lens, the lens movement The control data includes both focal length adjustment data and focus adjustment data.
[0055]
Although the digital camera has been described here, the present invention is also applicable to a camera that takes a picture on a silver salt type photographic film.
[0056]
【The invention's effect】
According to the present invention, it is possible to optimally control the movement of the photographing lens even with respect to different types of interchangeable lenses.
[Brief description of the drawings]
FIG. 1 is a front view of a digital camera according to an embodiment of the present invention.
FIG. 2 is a rear view of the digital camera of FIG.
3 is a side view of the digital camera of FIG. 1. FIG.
FIG. 4 is a block diagram illustrating a configuration of a signal processing unit provided in a camera body.
FIG. 5 is a flowchart showing an operation at the time of lens replacement.
FIG. 6 is a flowchart of movement control data reading processing at power-on.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lens barrel 3 Shooting lens 5 Drive motor 8 EEPROM (data storage part)
10 Digital Camera 100 Camera Body 111 CPU (Movement Control Unit)
112 DSP
114 FLASHROM

Claims (6)

In a camera that includes a camera body and an interchangeable lens that can be attached to the camera body, and that captures a subject that has entered through the interchangeable lens attached to the camera body,
The interchangeable lens is
A lens barrel,
A photographic lens disposed in the lens barrel;
A data storage unit disposed in the lens barrel and storing data for movement control of the photographing lens;
The camera body receives movement control data stored in a data storage unit of an interchangeable lens attached to the camera body, and performs movement control for performing lens movement control of the photographing lens according to the movement control data A camera characterized by comprising a part. The camera according to claim 1, wherein the camera body receives the movement control data from the interchangeable lens at a timing when the interchangeable lens is attached to the camera body. The camera body receives the movement control data from the interchangeable lens at a power-on timing of the camera body in a state where the interchangeable lens is attached to the camera body. Camera. The interchangeable lens has a built-in drive motor that drives a photographing lens that is pulse-driven to form the interchangeable lens, and the movement control data includes the drive motor drive method data and the drive motor data. 2. The camera according to claim 1, further comprising pulse number data for determining a rotation amount and controlling a moving amount of the photographing lens. In an interchangeable lens that is detachably attached to the camera body, is linked to the camera body, and transmits a subject image to the camera body for shooting.
A lens barrel,
A photographic lens disposed in the lens barrel;
A data storage unit disposed in the lens barrel and storing movement control data of the photographing lens;
The interchangeable lens, wherein the data storage unit transfers the stored movement control data to the camera body in response to a request from the camera body to which the interchangeable lens is attached. In the camera body where the interchangeable lens can be freely attached and detached, and the subject image that has entered through the attached interchangeable lens is captured,
The interchangeable lens is
A lens barrel,
A photographic lens disposed in the lens barrel;
A data storage unit disposed in the lens barrel and storing movement control data of the photographing lens;
The camera body receives movement control data stored in the data storage unit of the interchangeable lens attached to the camera body, and performs movement control for performing lens movement control of the interchangeable lens according to the movement control data. Camera body characterized by having a part.

Images