JP2008261983A - Camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera capable of high-speed operation by shortening communication time with an interchangeable lens or various accessories. <P>SOLUTION: The camera includes a memory such as a flash memory 235 or an SDRAM 237 in which lens data concerning two or more kinds of mountable interchangeable lens barrels 100 can be registered, and a body CPU 229 which performs drive control of a mounted photographic lens in accordance with the lens data registered in the memory, and has a step (lens communication 2) to acquire the lens data from the interchangeable lens barrel 100 and register it in the memory in response to first operation (steps S9, S23 and S25), and a step (lens communication 1) to decide whether or not the lens data on the mounted interchangeable lens barrel 100 is registered in the memory, and acquire the lens data from the interchangeable lens barrel 100 and register it in the memory when deciding that the lens data are not registered therein in response to second operation (steps S1 and S5). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a camera, and more particularly to a camera system in which a lens can be exchanged or a camera to which a camera accessory can be attached.

In a camera system in which a lens interchangeable camera system or accessory is detachable, the camera body performs various calculations and controls based on information from a read-only memory (ROM) built into the interchangeable lens or camera accessory. It is common.

For example, in Patent Document 1, various data necessary for autofocus operation and exposure operation are stored in a ROM in a lens, and when performing the operation on the camera body side, communication is performed with an interchangeable lens, and the data is stored. Reading is disclosed. Patent Document 2 discloses that all data stored in the lens is read when the interchangeable lens is mounted or when the power is turned on, and stored in a storage unit in the camera body.
Japanese Patent Publication No. 5-59411 Japanese Patent No. 2868226

However, in the technique disclosed in Patent Document 1 described above, as the amount of information recorded in the ROM increases, it takes time for data communication between the camera body and the interchangeable lens, and the data communication becomes a time lag in each operation. As a result, there is a problem that the high-speed performance is impaired. In the technique disclosed in Patent Document 2, since data communication is performed when the lens is mounted, the problem of time lag in each operation is solved, but a large amount of data communication is performed when the lens is mounted, and thus the lens mounting is completed. Then, there is a problem that it always takes a long time until the camera is ready for photographing.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a camera capable of reducing the communication time with an interchangeable lens and various accessories and operating at high speed.

In order to achieve the above object, a camera according to a first aspect of the present invention is a storage means capable of registering unique information relating to a plurality of types of photographic lenses that can be attached, and an image attached attached in accordance with the unique information registered in the storage means. In response to a first operation, a control unit that performs lens drive control, a first registration unit that acquires the unique information from the photographing lens and registers it in the storage unit, and a response to the second operation And determining whether or not the specific information of the photographic lens mounted is registered in the storage means. If it is determined that the specific information of the photographic lens is not registered, the storage means acquires the specific information from the photographic lens. The second registration means for registering to the above.

The camera according to a second aspect of the present invention is the camera according to the first aspect, wherein the first operation is an operation for mounting the photographing lens or an instruction operation for re-registration, and the second operation is the camera. This is a startup operation.
Furthermore, in the camera according to the third invention, in the first invention, the unique information of the photographing lens includes identification data for identifying the photographing lens, and the second registration means is the photographing lens. The determination is performed by comparing the identification information included in the unique information acquired from the information and the identification information included in the unique information stored in the storage unit.
Further, in the camera according to the fourth invention, in the third invention, the unique information is rewritable, and the identification information is changed / corrected when the identification information is rewritten.

In order to achieve the above object, a camera according to a fifth aspect of the present invention is a storage means capable of registering specific information relating to a plurality of types of camera accessories that can be mounted, and the above-mentioned mounted according to the specific information registered in the storage means. In response to a first operation, a control unit that performs drive control of the camera accessory, a first registration unit that acquires the unique information from the camera accessory and registers it in the storage unit, and a response to the second operation Then, it is determined whether or not the unique information of the attached camera accessory is registered in the storage means. If it is determined that the unique information is not registered, the unique information is acquired from the camera accessory and Second registration means for registering in the storage means is provided.

The camera of the present invention can reduce the communication time with the interchangeable lens and various accessories, and can provide a camera that can operate at high speed.

Hereinafter, a preferred embodiment using a digital single lens reflex camera to which the present invention is applied will be described with reference to the drawings. This digital single-lens reflex camera can be mounted with various interchangeable lenses. All or a part of these interchangeable lenses has a memory for storing unique information of the interchangeable lens. The digital single-lens reflex camera according to this embodiment reads this unique information, and performs camera control using this unique information during automatic focus adjustment, automatic exposure control, and the like.

FIG. 1 is a block diagram showing the overall configuration of the electrical system of the digital single-lens reflex camera according to the present embodiment. Inside the interchangeable lens barrel 100, photographing lenses 101 and 102 for adjusting the focus and the focal length, and a diaphragm 103 for adjusting the aperture amount are arranged. The lens 101 and the lens 102 are driven by a lens driving mechanism 107, and the aperture 103 is driven by an aperture driving mechanism 109.

The lens driving mechanism 107 and the aperture driving mechanism 109 are each connected to a lens CPU (Central Processing Unit) 111, and the lens CPU 111 is connected to the camera body 200 via a communication contact 300. The lens CPU 111 controls the interchangeable lens barrel 100. The lens CPU 111 controls the lens driving mechanism 107 to perform focusing and zoom driving, and controls the diaphragm driving mechanism 109 to control the aperture value.

The interchangeable lens barrel 100 is provided with a lens data ROM (Read Only Memory) 105 for storing various data related to the lens barrel, for example, focal length information, aperture value information, lens aberration information, and the like. And connected to the lens CPU 111. The lens data ROM 105 may be a non-rewritable memory such as a mask ROM. In the present embodiment, the lens data ROM 105 is configured by a rewritable nonvolatile memory such as a flash memory or an E ² PROM. The lens CPU 111 reads various data stored in the lens data ROM 105 and writes information in response to a request from the body CPU 229.

Within the camera body 200, there are a position inclined 45 degrees with respect to the lens optical axis in order to reflect the subject image to the observation optical system, and a position raised to guide the subject image to the image sensor (CCD 221 described later). A movable mirror 201 that can be rotated is provided. Above the movable mirror 201, a focusing screen 205 for forming a subject image is disposed, and above this focusing screen 205, a pentaprism 207 for horizontally reversing the subject image is disposed. An eyepiece lens 209 for observing a subject image is disposed on the subject light emission side (right side in FIG. 1) of the pentaprism 207.

Near the center of the movable mirror 201 described above is a half mirror, and on the back surface of the movable mirror 201, a sub mirror 203 for reflecting subject light transmitted through the half mirror portion to the lower part of the camera body 200 is provided. ing. The sub mirror 203 is rotatable with respect to the movable mirror 201. When the movable mirror 201 is flipped up, the sub mirror 203 is rotated to a position that covers the half mirror portion. When the movable mirror 201 is at the subject image observation position, the sub mirror 203 is illustrated. In this way, it is in a position that is open with respect to the movable mirror 201. This movable mirror 201 is driven by a mirror drive mechanism 219. In addition, a distance measuring circuit 217 including a distance measuring sensor is disposed below the sub mirror 203, and this circuit determines a focus shift amount of a subject image formed by the photographing lenses 101 and 102 by a so-called phase difference method. This is a circuit for measuring.

A focal plane type shutter 213 for controlling the exposure time is disposed behind the movable mirror 201. The shutter 213 is driven and controlled by a shutter drive mechanism 215. A CCD (Charge Coupled Device) 221 as an image pickup device is disposed behind the shutter 213 and photoelectrically converts a subject image formed by the lenses 101 and 102 into an electric signal. In the present embodiment, a CCD is used as an image sensor. However, the present invention is not limited to this, and a CMOS (Complementary Metal Oxide) is used.
Needless to say, a two-dimensional imaging device such as Semiconductor) can be used.

The CCD 221 is connected to a CCD drive circuit 223, and analog / digital conversion (AD conversion) is performed by the CCD drive circuit 223. The CCD drive circuit 223 is connected to the image processing circuit 227 via the CCD interface 225. The image processing circuit 227 performs various types of image processing such as color correction, gamma (γ) correction, and contrast correction. In addition, image data for live view display (also referred to as live view or electronic viewfinder) on the liquid crystal monitor 26 is also generated.

The image processing circuit 227 is an ASIC (Application Specific Integrated).
Circuit: an application specific integrated circuit) 271 is connected to the data bus 261. In addition to the image processing circuit 227, the data bus 261 includes a body CPU 229, a compression circuit 231, a flash memory control circuit 233, an SDRAM control circuit 236, an input / output circuit 239, a communication circuit 241, a recording medium control circuit 243, and a video signal output. A circuit 247 and a switch detection circuit 253 are connected.

The body CPU 229 connected to the data bus 261 controls the flow of this digital single lens reflex camera. A compression circuit 231 connected to the data bus 261 is a circuit for compressing the image data stored in the SDRAM 237 with JPEG or TIFF. Note that image compression is not limited to JPEG or TIFF, and other compression methods can be applied. The compression circuit 231 also expands image data recorded in a compression format on a recording medium 245 described later.

A flash memory control circuit 233 connected to the data bus 261 is connected to a flash memory 235. The flash memory 235 stores a program for controlling the flow of the single-lens reflex camera. The CPU 229 controls the digital single-lens reflex camera according to the program stored in the flash memory 235. Note that the flash memory 235 is an electrically rewritable nonvolatile memory. The SDRAM 237 is connected to the data bus 261 via the SDRAM control circuit 236, and the SDRAM 237 temporarily stores the image data processed by the image processing circuit 227 or the image data compressed by the compression circuit 231. This is a buffer memory.

The input / output circuit 239 connected to the shutter drive mechanism 215, the distance measuring circuit 217, and the mirror drive mechanism 219 described above controls data input / output with each circuit such as the body CPU 229 via the data bus 261. The communication circuit 241 connected to the lens CPU 111 via the communication contact 300 is connected to the data bus 261, and exchanges data with the body CPU 229 and the like and communicates control commands.

A recording medium control circuit 243 connected to the data bus 261 is connected to the recording medium 245 and controls recording of image data and the like on the recording medium 245. The recording medium 245 can be loaded with any rewritable recording medium such as an xD picture card (registered trademark), a compact flash (registered trademark), an SD memory card (registered trademark), or a memory stick (registered trademark). And is detachable from the camera body 200. In addition, the hard disk may be configured to be connectable via a communication contact.

The video signal output circuit 247 connected to the data bus 261 is connected to the liquid crystal monitor 26 via the liquid crystal monitor drive circuit 249. The video signal output circuit 247 is a circuit for converting the image data stored in the SDRAM 237 and the recording medium 245 into a video signal to be displayed on the liquid crystal monitor 26. The liquid crystal monitor 26 is disposed on the back surface of the camera body 200. However, the liquid crystal monitor 26 is not limited to the back surface as long as the photographer can observe the image.

First and second release switches for detecting the first stroke (half press) and second stroke (full press) of the shutter release button, a switch for instructing a playback mode, a switch for instructing an ISO setting mode, and an instruction for white balance setting Switch for instructing the movement of the cursor on the screen of the liquid crystal monitor 26, a switch for instructing a photographing mode, an OK switch for determining each selected mode, a switch for instructing display mode switching, and the interchangeable lens barrel 100 Various switches 255 such as a lens attachment / detachment detection switch for detecting the mounting state of the lens are connected to the data bus 261 via the switch detection circuit 253.

When the first release switch (hereinafter referred to as 1R) that is linked to the shutter release button is turned on, the camera performs a shooting preparation operation such as focus detection, focusing of the shooting lens, and photometry of subject luminance. Further, when the second release switch (hereinafter referred to as 2R) is turned on, the camera executes image capturing operation for capturing the image data of the subject image and recording the image data on the recording medium based on the output of the CCD 221 as the image sensor.

The lens attachment / detachment detection switch (not shown) is configured by a mechanical switch that is provided on the lens mount surface and moves forward and backward by the interchangeable lens barrel 100, a photoelectric switch that detects the mounting of the interchangeable lens barrel 100, or the like.

A lens data reset switch 257 is also connected to the switch detection circuit 253. As will be described later, the lens data reset switch 257 is an operation switch for reading the lens data stored in the lens data ROM 105 into the camera body 200 and performing an operation.

Next, the operation of the present embodiment will be described with reference to the flowcharts shown in FIGS. When a power supply battery (not shown) is loaded in the camera body 200, a power-on reset routine shown in FIG. 2 starts. First, it is determined by the switch detection circuit 253 whether a power switch (not shown) is on (S1). If the result of determination is that the power switch is off, sleep mode is entered (S3). The sleep mode is a mode in which only the state of the power switch is detected, and the body CPU 229 and the lens CPU 111 are set in the sleep state to reduce power consumption.

If the result of determination in step S <b> 1 is that the power switch is on, it is subsequently determined whether or not the interchangeable lens barrel 100 is attached to the camera body 200. This determination is made based on the state of a lens attachment / detachment detection switch (not shown).

If the result of determination in step S5 is that the interchangeable lens barrel 100 is attached, lens communication 1 is executed (S7). This lens communication 1 is a subroutine for reading lens data only when the data in the lens data ROM 105 has not been read. Details will be described later with reference to FIG.

If the result of determination in step S <b> 5 is that the interchangeable lens barrel 100 is not mounted, the process proceeds to step S <b> 9 and it is determined again whether or not the interchangeable lens barrel 100 is mounted. If the result of determination is that the power switch is not attached, it is then determined whether or not the power switch is on, as in step S1 (S13). If the result of determination is that the power switch is off, the process jumps to step S3 and enters the sleep mode described above.

If the result of determination in step S13 is that the power switch is on, processing returns to step S9 and it is determined whether or not the interchangeable lens barrel 100 is attached (S9). If the result of determination is that the interchangeable lens barrel 100 is attached, a subroutine for lens communication 2 is executed (S11). The lens communication 2 is a subroutine for reading lens data from the lens data ROM 105 regardless of whether lens data has already been read, and will be described later in detail with reference to FIG.

If the interchangeable lens barrel 100 is attached when the power switch is turned on in step S1, the lens communication 1 is executed in the order of step S1, step S5, and step S7. In this case, the lens data is read only when the lens data of the interchangeable lens barrel 100 is not already read.

On the other hand, if the interchangeable lens barrel 100 is not attached when the power switch is turned on in step S1, and the interchangeable lens barrel 100 is attached later at the timing of step S9, step S1 → step S5 → step S9. The process proceeds in the order of step S13, step S9, step S11, and the lens communication 2 is executed. In this case, the lens data is read regardless of whether the lens data of the interchangeable lens barrel 100 has already been read.

When the lens communication 1 subroutine in step S7 or the lens communication 2 subroutine in step S11 is completed, the display timer is then reset and started (S15). The display timer is a timer for preventing power consumption in the display unit such as the liquid crystal monitor 26. Although details are not shown in this flow, when the set time elapses after the display timer is reset, the display on the display unit is stopped.

Subsequently, the shooting mode and shooting conditions are read (S17). Reading of the shooting mode and shooting conditions is performed by detecting these settings because the photographer inputs a mode dial, menu mode, and the like provided in the camera body 200.

Subsequently, photometry / exposure amount calculation is performed (S19). The subject brightness is measured by a photometric sensor (not shown) provided near the exit of the pentaprism 207 and at a position that does not interfere with the viewfinder observation by the eyepiece lens 209. Then, based on the output of the photometric sensor, an exposure amount is calculated, and exposure control values such as a shutter speed and an aperture value are determined. Thereafter, the shooting mode and shooting conditions read in step S17 and the shooting information such as the exposure control value obtained in step S19 are displayed on the display unit such as the liquid crystal monitor 26 (S21).

Next, it is determined whether the lens data reset switch 257 has been operated to instruct the lens data reset (S23). This operation is performed when the photographer wants to capture the lens data related to the interchangeable lens barrel 100 stored in the lens data ROM 105 into the camera body 200 forcibly. If the result of determination is that this instruction has been made, a subroutine for lens communication 2 is executed as in step S11 (S35). When the processing of this subroutine is completed, the process returns to step S15 and the above steps are repeated.

If no lens data reset instruction is given in step S23, it is determined whether or not the lens has been replaced (S25). This determination is based on the state of the lens attachment / detachment detection switch described above, and it is determined whether or not the interchangeable lens barrel 100 is attached again in step S5 or step S9 after the interchangeable lens barrel 100 is attached. To do. If the lens is exchanged as a result of the determination, the lens communication 2 subroutine is executed as in step S35, and the lens data is read regardless of whether the lens data has already been read (S37). . When the processing of this subroutine is completed, the process returns to step S15 and the above steps are repeated.

If it is determined in step S25 that the lens is not exchanged, it is next determined whether or not the 1R switch is on (S27). When the release button is pressed halfway and the 1R switch is turned on, a shooting operation is performed (S39). The shooting operation performs photometry / exposure amount calculation and automatic focus adjustment operation when 1R is turned on, and raises the movable mirror 201 when the 2R is turned on, that is, with a predetermined exposure control value. The shutter 213 and the aperture 103 are controlled, the subject image is photoelectrically converted by the CCD 221, and various processes are performed to record the image data on the recording medium 245. When the 1R switch is turned off, the photographing operation is terminated, the process returns to step S15, and the above steps are repeated.

If it is determined in step S27 that the 1R switch is off, it is next determined whether a setting change operation has been performed (S29). That is, it is determined whether various settings such as the shooting mode and the menu mode have been changed. If the settings are changed as a result of the determination, a setting change operation is performed (S41). When the setting change operation is finished, the process returns to step S15 and the above steps are repeated.

If the result of determination in step S29 is that a setting change operation has not been performed, it is next determined whether or not the power switch is on, as in step S1 (S31). If the result of determination is that it is on, processing returns to step S15 and the above steps are repeated. On the other hand, when the power switch is turned off, lens communication 3 is performed (S33). This lens communication 3 relates to processing of lens data at power-off, and will be described later in detail with reference to FIG.

Next, the operation of the lens communication 1 will be described with reference to FIG. When the lens communication 1 subroutine is entered in step S7 described above, first, lens registration data is searched (S51). As will be described later, since the lens data is registered in the flash memory 235, the lens registration data 121 (see FIG. 5) stored in the flash memory 235 is searched.

Subsequently, it is determined whether lens registration data exists based on the lens registration data search result (S53). If there is lens registration data as a result of the determination, the lens registration data is copied (S55). As shown in FIG. 5, in this copy, the lens registration data 121 stored in the flash memory 235 is copied to the lens data area 122 in the SDRAM 237 by direct memory access (DMA) (a1 in FIG. 5).

Here, the copy of the lens data here is that when the lens data of a plurality of types of interchangeable lens barrels is stored in the flash memory 235, the lens data of all types of interchangeable lenses is stored in the flash memory 235. Directly copied between the SDRAMs 237.

FIG. 5 also shows the data flow of accessory data. This is a case where a camera accessory such as a strobe device is attached. Similarly to the case of lens data, the accessory registration data 321 stored in the flash memory 235 is stored in the accessory data area 322 of the SDRAM 237 by DMA. Copied. When the accessory is a strobe device, for example, the light emission amount (guide number), the irradiation angle, and the like are registered as accessory data.

When copying of the lens registration data is completed in step S55, or if the lens registration data is not retrieved as a result of the determination in step S53, the lens is initialized (S57). In the initialization of the lens, mechanical initialization such as setting the focal position of the interchangeable lens barrel to infinity and setting the aperture to the open state, and electrical reset of the electric circuit components such as the lens CPU 111 are performed.

When the lens initialization is completed, it is subsequently determined whether or not the lens initialization is successful (S59). If the lens initialization is successful as a result of the determination, lens identification data is subsequently requested to the lens CPU 111 (S61). The lens identification data is a part of the lens registration data, and is data indicating the model of the interchangeable lens barrel. The lens identification data is stored in the lens data ROM 105 and has a data structure as shown in FIG. That is, a vendor ID consisting of 2 bytes, a lens ID consisting of 2 bytes, a hardware (H / W) version consisting of 2 bytes, and random data consisting of 1 byte.

The vendor ID is information indicating the manufacturer of the interchangeable lens barrel. The lens ID is a model of the interchangeable lens barrel, for example, 14-54 mm, F2.8-3.5, 25 mm, F1.4, etc. , Information corresponding to an interchangeable lens model specified by a focal length, an open aperture value, and the like. The H / W version is hardware version information of the interchangeable lens barrel. Random data is multipurpose data, and in the present embodiment, represents random lens correction information or version information.

That is, the random data included in the lens identification information can be rewritten when the lens type information (lens ID) and the lens specific information (lens data) of the interchangeable lens barrel 100 are corrected. For example, when the lens data version is changed or when the lens data is corrected by repair or the like, the random data is changed / corrected.

In step S61, the lens CPU 111 is requested for the lens identification data having the data structure as described above, and the lens CPU 111 reads the lens identification data and returns it to the body CPU 229. Based on the return result, it is determined whether or not the identification data has been successfully received (S63).

If the result of determination in step S63 is that the identification data has been successfully received, lens identification data is then compared (S65). In this step, the lens registration data already registered in step S55 is copied to the SDRAM 237. The lens identification data in the copied lens registration data and the lens identification data read in step S61, that is, currently mounted. A comparison is made as to whether the lens identification data of the interchangeable lens barrel 100 matches or does not match.

Based on the comparison in step S65, it is determined whether the identification data match (S67). As a result of the determination, if they match, the routine directly returns to the power-on reset routine shown in FIG. That is, in this case, since the lens data has already been read and registered, the lens data is not read out. As a result, reading of the lens data can be omitted, and the photographing operation can be started immediately, so that the time lag can be shortened.

On the other hand, if there is no matching identification data as a result of the determination in step S67, or if the identification data has not been successfully received as a result of the determination in step S63, the lens CPU 111 of the interchangeable lens barrel 100 is notified. Then, a lens data transmission request is made (S69). In response to this transmission request, lens data is returned from the lens CPU 111, and based on this, it is determined whether or not the lens data has been successfully received (S71).

If the lens data is successfully received as a result of the determination, the lens data including the lens identification data is stored in the lens data area 122 of the SDRAM 237. On the other hand, if the lens data is not successfully received in step S71, or if the lens initialization is not successful in step S59, the existing lens data is read (S75).

When the process proceeds to step S75, there may be an electrical contact failure or a communication failure, but there are cases where the interchangeable lens barrel itself does not have the lens CPU 111 or the lens data ROM 105. . In any case, since the camera control in the camera body 200 is performed on the premise of the presence of lens data, if the lens data is not successfully read, the lens existing data (default value) is read and based on this data. Take control.

Next, the operation of the lens communication 2 will be described. When the lens communication 2 subroutine is entered in steps S11, S35, and S37 described above, lens initialization is executed as in step S81 (S81). Subsequently, as in step S61, a lens identification data transmission request is made to the lens CPU 111 (S61).

Next, the process proceeds to step S69, and a lens data transmission request is made to the lens CPU 111 as described above. That is, in the case of the lens communication 1, it is determined whether or not the lens registration data 121 is already stored in the flash memory 235. If it is recorded, the lens data is read from the interchangeable lens barrel 100. Not to do. However, in this lens communication 2, regardless of whether or not lens data is already stored in the flash memory 235, the process proceeds from step S81 to step S83 to step S69, and the lens data is read.

Next, the lens communication 3 will be described with reference to the flowchart shown in FIG. In this lens communication 3, the lens data is copied to the flash memory when the power is turned off. When the lens communication 3 subroutine is entered in step S33 described above, first, lens registration data is searched (S91). Here, it is searched whether the lens registration data 121 (see FIG. 6) is stored in the flash memory 235.

When the search is completed, it is next determined whether or not it has been registered based on the search result (S93). In this determination, as shown in FIG. 6, the lens identification data 132 in the lens data area 122 in the SDRAM 237 and the lens identification data 131 in the lens registration data 121 in the flash memory 235 are compared (a11 in FIG. 6). See) to determine whether there is matching data.

If the result of determination in step S93 is that there is no matching data, lens data is registered (S95). In this case, lens data corresponding to the currently mounted interchangeable lens barrel 100 is not stored in the flash memory 235. Therefore, the lens data stored in the lens data area 122 in the SDRAM 237 is copied by DMA to the lens registration data 121 area in the flash memory 235 as shown in FIG. 6 (see a12 in FIG. 6).

Here, when the lens data of the plural types of interchangeable lens barrels is stored in the SDRAM 237, the lens data of the interchangeable lens is copied in the SDRAM 237 and the flash memory 235. Directly copied between.

FIG. 6 also shows the data flow of accessory data. Similar to FIG. 5, this is a case where a camera accessory such as a strobe device is mounted. Similarly to the case of lens data, the data stored in the accessory data area 322 stored in the SDRAM 237 is The data is directly copied between the memories in the area of the accessory registration data 321 in the flash memory 235.

When the registration of the lens data in step S95 is completed, a lens end process is performed (S97). Alternatively, even if it is determined in step S93 that the lens has been registered, the lens data is already stored in the flash memory 237, so that the lens end process for returning the lens to the initial position is performed and the process returns to the original routine. .

As described above, in the present embodiment, storage means (flash memory 235 or SDRAM 237) capable of registering unique information (lens data) regarding a plurality of types of photographic lenses (interchangeable lens barrel 100) that can be mounted, and the storage. In response to the control means (body CPU 229) that controls the driving of the photographic lens mounted according to the unique information (lens data) registered in the means and the first operation (steps S9, S23, S25) In response to the first registration means (lens communication 2) for acquiring the unique information from the lens and registering it in the storage means, and the second operation (steps S1 and S5), the unique information of the mounted taking lens is obtained. It is determined whether or not it is registered in the storage means, and when it is determined that it is not registered, the unique information is acquired from the photographing lens and the storage And comprising a second registration means for registering (lens communication 1).

With such a configuration, it is possible to provide a camera capable of reducing the communication time with the photographing lens and operating at high speed. That is, the unique information is acquired when the first operation is performed, but the unique information is acquired only when the unique information is registered in the second operation. Reduces communication time and enables high-speed operation. In addition, when the lens data in the taking lens is rewritten due to repair or the like, communication is omitted in the conventional camera, and the unique information registered in the storage unit of the camera body may not be rewritten and updated to the latest state. However, since the unique information can be acquired by the first operation, such a problem can be solved.

In the present embodiment, the first operation is a photographing lens mounting operation (steps S9 and S25) or an instruction operation for re-registration (step S23), and the second operation is a camera activation operation (step S23). Steps S1 and S5). For this reason, when the activation operation is performed with the interchangeable lens barrel 100 attached, the second operation is performed, so that the unique information is acquired only when the unique information is not registered. . In addition, when the specific information is intentionally registered, the first operation may be performed, so that the communication time can be reduced and high-speed operation can be performed.

Further, in the present embodiment, the unique information (lens data) of the photographic lens includes identification data (lens identification data) for specifying the photographic lens, and the second registration unit acquires the unique information acquired from the photographic lens. The determination is made by comparing the identification information (lens identification data) included in (lens data) with the identification information (lens identification data) included in the unique information stored in the storage means (flash memory 235). ing. For this reason, it is not necessary to compare all the unique information, and the identification information can be compared, so that high-speed processing can be performed.

Further, in the present embodiment, the unique information can be rewritten in the photographic lens, and the identification information is also changed / corrected when the identification information is rewritten in the photographic lens. For this reason, when the unique information of the photographic lens is rewritten, such as repair, the unique information is automatically read by the second registration means, so it is necessary to forcibly read the unique information by the first registration means. Convenient to lose.

In the present embodiment, the lens data stored in the lens data ROM 105 in the interchangeable lens barrel 100 has been mainly described. However, as described in the description of FIGS. Even in accessory data stored in a memory built in a camera accessory, reading of accessory data may be switched depending on the mounting state of the camera body and the operation content.

In addition, the conditions and timing for performing the lens communication 1 and the lens communication 2 in the present embodiment are not limited to the example shown in the present embodiment, and the lens communication 2 is performed only at the timing when the lens data reset instruction is given. Various modifications are possible, such as. Furthermore, in this embodiment, the determination of the lens data reset instruction in step S23 (FIG. 2) is performed by detecting the setting state of the lens data reset SW 257, but is not limited to this, for example, in the menu mode. The lens data reset may be set, and this may be detected and determined.

Further, in step S55 of FIG. 3 of the present embodiment, all of the lens data registered in the flash memory 235 is copied. Based on the lens identification data acquired in step S61, necessary lens data is stored in the SDRAM 237. The flow of lens data, such as copying, can be variously modified.

Furthermore, in the present embodiment, an example in which the camera is applied to a single-lens reflex digital camera has been described. However, the present invention is not limited to a digital single-lens reflex camera, and can be applied to, for example, a compact type digital camera, and further, a microscope. Needless to say, the present invention can also be applied to a camera that can be attached to a dedicated device such as a photographic apparatus. In any case, any camera or electronic imaging device to which a lens barrel, accessories, etc. can be attached may be used.

1 is a block diagram illustrating an overall configuration of an electric system of a digital single-lens reflex camera according to an embodiment of the present invention. It is a flowchart figure which shows the routine of the power on reset in one Embodiment of this invention. It is a flowchart figure which shows the subroutine of the lens communication 1 and the lens communication 2 in one Embodiment of this invention. It is a flowchart figure which shows the subroutine of the lens communication 3 in one Embodiment of this invention. FIG. 6 is a diagram for explaining a data flow between a flash memory in a camera body and an SDRAM in the case of lens communication 1 in an embodiment of the present invention. FIG. 6 is a diagram for explaining a data flow between a flash memory in the camera body and an SDRAM at the time of power-off in an embodiment of the present invention. It is a figure which shows the data structure of the lens identification data in one Embodiment of this invention.

Explanation of symbols

26 ... Liquid crystal monitor, 100 ... Interchangeable lens barrel, 101 ... Shooting lens, 102 ... Shooting lens, 103 ... Aperture, 105 ... Lens data ROM, 107 ... Lens drive 109, aperture drive mechanism, 111, lens CPU, 121, lens registration area, 122, lens data area, 131, lens identification data, 132, lens identification data, 200 ... Camera body, 201 ... Movable mirror, 203 ... Sub mirror, 205 ... Focusing screen, 207 ... Pentaprism, 209 ... Eyepiece, 213 ... Shutter, 215 ... Shutter drive mechanism, 217 ... distance measuring circuit, 219 ... mirror drive mechanism, 221 ... CCD, 223 ... CCD drive circuit, 225 CCD interface circuit, 227 ... image processing circuit, 229 ... body CPU, 231 ... compression circuit, 233 ... flash memory control circuit, 235 ... flash memory, 236 ... SDRAM control circuit 237 ... SDRAM, 239 ... input / output circuit, 241 ... communication circuit, 243 ... recording medium control circuit, 245 ... recording medium, 247 ... video signal output circuit, 249 ... Liquid crystal monitor drive circuit, 253, switch detection circuit, 255, various switches, 257, lens data reset switch, 261, data bus, 271, ASIC, 300, communication contact, 321 ... Accessory registration area, 322 ... Accessory data area, 331 ... Accessory identification data, 332 Accessories identification data

Claims (5)

Storage means capable of registering specific information regarding a plurality of types of photographic lenses that can be mounted;
Control means for controlling the driving of the photographic lens mounted according to the unique information registered in the storage means;
In response to a first operation, a first registration means for acquiring the unique information from the photographing lens and registering it in the storage means;
In response to the second operation, it is determined whether or not the unique information of the photographic lens mounted is registered in the storage means. If it is determined that the photographic lens is not registered, the unique information is obtained from the photographic lens. Second registration means for acquiring and registering in the storage means;
It is equipped with the camera characterized by the above-mentioned.   2. The camera according to claim 1, wherein the first operation is an operation for attaching the photographing lens or an instruction operation for re-registration, and the second operation is an operation for starting the camera.   The unique information of the photographing lens includes identification data for identifying the photographing lens, and the second registration unit stores the identification information included in the unique information acquired from the photographing lens and the storage unit. The camera according to claim 1, wherein the determination is performed by comparing identification information included in the stored unique information.   The camera according to claim 3, wherein the unique information is rewritable, and the identification information is changed / modified when the identification information is rewritten. Storage means capable of registering specific information on a plurality of types of camera accessories that can be mounted;
Control means for controlling the drive of the camera accessory mounted according to the unique information registered in the storage means;
In response to a first operation, first registration means for acquiring the unique information from the camera accessory and registering it in the storage means;
In response to the second operation, it is determined whether or not the unique information of the attached camera accessory is registered in the storage means. If it is determined that the unique information of the attached camera accessory is not registered, the unique information from the camera accessory is determined. Second registration means for acquiring information and registering it in the storage means;
It is equipped with the camera characterized by the above-mentioned.