JP4253384B2 - Interchangeable lens and camera system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention can be shared by at least two types of camera bodies having different image sizes and the camera bodies.ExchangeAbout
[0002]
[Prior art]
Conventionally, two camera bodies using different recording media such as a camera body using a silver salt film and a camera body using an image sensor such as a CCD (Charge Coupled Device) can be used in common for both camera bodies. Various techniques have been developed for camera systems having interchangeable lenses. With regard to such a camera system, for example, “Photographic Industries (April 1998 issue P97 to P100)” shows related technologies.
[0003]
Here, when a common interchangeable lens is used for both the camera bodies, there is no significant difference in the angle of view in both camera bodies, so that both image sizes can be used without any sense of incongruity. It is desirable to make the size of the shooting screen uniform. In general, the image size of a silver salt film is 36 mm × 24 mm when a 135 format roll film is used. Even when an IX240 cartridge film is used, the image size is 27.4 mm × 15. 6 mm.
[0004]
Therefore, in order to obtain the same angle of view in the digital camera body, the image size can be reduced by using the first method using an image sensor having the same image size, or using a reduction optical system behind the imaging surface. Therefore, it is necessary to adopt the second method using a small image sensor.
[0005]
While the second method has an advantage that a small CCD can be used, it requires a space for the reduction optical system, and thus has a drawback that the camera becomes large and heavy. On the other hand, although the first method is advantageous in terms of the size and weight of the camera, it has a drawback that it requires a large-size image sensor and increases the cost.
[0006]
By the way, in the case of an image pickup device such as a CCD, as the chip size is first increased due to the semiconductor manufacturing process, the number of wafers taken from the semiconductor wafer is simply reduced in view of the area ratio, resulting in an increase in cost. Secondly, the larger the chip size, the worse the chip yield and the higher the cost. This is the acceleration condition of the first problem. Thirdly, since the semiconductor wafer is usually circular and the image pickup element is usually square, the larger the chip size, the greater the waste in the peripheral part, leading to higher costs. This is also an acceleration condition for the first problem.
[0007]
From the above, assuming the current semiconductor manufacturing technology, we should not stick to the same image size, that is, the size of the shooting screen, but rather to balance the cost and size of the image sensor. It is thought that it is necessary to make the angle of view slightly smaller than that of the salt film to allow the fluctuation of the angle of view.
[0008]
[Problems to be solved by the invention]
  HoweverThe size of the imageWhen changing between mela bodiesWhen a uniform control sequence is executed for interchangeable lenses that can be used in common for camera bodies having different image sizes, it is possible to perform shooting suitable for the image size of the camera body to which the interchangeable lenses are attached. It becomes difficult. For example,As described above, since the image size of the image sensor is small, the shooting angle of view becomes small. In other words, when a wide-angle lens is mounted, the feeling of use is close to that of a standard lens, and there is a problem that it is difficult to take a picture taking advantage of the characteristics of the wide-angle lens.
[0009]
  The present invention has been made in view of the above problems, and its object is to,smallImage sizeMosquitoEven when attached to the camera body, a large image sizeOfAttached to the camera bodyEven in such a case, it is possible to perform photographing suitable for the image size of the camera body to which the interchangeable lens is attached. For example, depending on the image size of the camera body to which this interchangeable lens is attached,The focal length variable rangeThis makes it possible to take pictures suitable for this camera body.There is to be.
[0010]
[Means for Solving the Problems]
  To achieve the above object, according to a first aspect of the present invention, a first camera body having a first image size and a second camera body having a second image size different from the first image size. Interchangeable lenses that can be used in common,Zoom driving means for varying the focal length of the taking lens in the interchangeable lens within a predetermined focal length range;Receiving means for receiving information relating to the image size of the camera body from the camera body on which the interchangeable lens is mounted, and control means for performing sequence control inside the interchangeable lens, the control means, According to the information related to the image size received by the receiving meansThe focal length usable range in which the resolving power of the peripheral portion of the screen in the captured image of the camera body on which the interchangeable lens is mounted is equal to or greater than a predetermined value is determined, and the predetermined focal length range of the zoom driving unit is determined as the focus. Change to the distance usable range,An interchangeable lens is provided.
  In the second aspect of the present invention, a first camera body having a first image size, a first camera body having a first image size, and a second image size different from the first image size are provided. An interchangeable lens that can be used in common with the second camera body, the zoom drive means for varying the focal length of the photographic lens in the interchangeable lens within a predetermined focal length range, and the interchangeable lens Receiving means for receiving information relating to the image size of the camera body from a mounted camera body, and control means for performing sequence control inside the interchangeable lens, the control means being the receiving means Depending on the received information about the image sizeThe focal length usable range in which the resolving power at the periphery of the screen in the photographed image of the camera body to which the interchangeable lens is attached is equal to or greater than a predetermined value is determined, and the current focal length of the photographing lens is out of the focal length usable range. In some cases, it is determined that shooting is impossible, and data indicating that shooting is not possible is transmitted to the camera body on which the interchangeable lens is mounted.An interchangeable lens is provided.
  In a third aspect of the present invention, a first camera body having a first image size, a second camera body having a second image size different from the first image size, and the first and second In the camera system comprising an interchangeable lens that can be used in common with the camera body, each of the first and second camera bodies is connected to the interchangeable lens on which information relating to the image size of its own camera body is mounted. Transmission means for transmitting
  The interchangeable lensZoom driving means for varying the focal length of the taking lens in the interchangeable lens within a predetermined focal length range;Receiving means for receiving information relating to the image size of the camera body from the camera body on which the interchangeable lens is mounted, and control means for performing sequence control inside the interchangeable lens, the control means, According to the information related to the image size received by the receiving means,The focal length usable range in which the resolving power at the periphery of the screen in the photographed image of the camera body on which the interchangeable lens is mounted is equal to or greater than a predetermined value is determined, and the predetermined focal length range of the zoom driving unit is determined. Change to the usable range,A camera system is provided.
  In a fourth aspect of the present invention, a first camera body having a first image size, a second camera body having a second image size different from the first image size, and the first and second In the camera system comprising an interchangeable lens that can be used in common with the camera body, each of the first and second camera bodies is connected to the interchangeable lens on which information relating to the image size of its own camera body is mounted. The interchangeable lens includes a zoom drive means for varying the focal length of the photographing lens in the interchangeable lens within a predetermined focal length range, and a camera body on which the interchangeable lens is mounted. Receiving means for receiving information relating to the image size of the camera body from, and control means for performing sequence control inside the interchangeable lens; The a, the control means, in accordance with information relating to the image size received by the receiving meansThe focal length usable range in which the resolving power at the periphery of the screen in the photographed image of the camera body to which the interchangeable lens is attached is equal to or greater than a predetermined value is determined, and the current focal length of the photographing lens is out of the focal length usable range. Shooting is impossible in some cases And transmitting data indicating that the above photographing is impossible to the camera body to which the interchangeable lens is attached,A camera system is provided.
  In a fifth aspect of the present invention, a first camera body having a first image size, a second camera body having a second image size different from the first image size, and the first and second In the camera system comprising the interchangeable lens that can be used in common with the camera body, the first and second camera bodies include body side receiving means for receiving data from the interchangeable lens, and whether or not photographing is impossible. Determination means for determining whether the interchangeable lens has a zoom driving means for changing a focal length of a photographing lens in the interchangeable lens within a predetermined focal length range, and sequence control in the interchangeable lens. And the first focus at which the resolving power at the periphery of the screen in the captured image corresponding to the first image size of the first camera body is greater than or equal to a predetermined value. The separation usable range and the second focal length usable range in which the resolving power of the peripheral portion of the screen in the captured image corresponding to the second image size of the second camera body is greater than or equal to a predetermined value are stored. An interchangeable lens that transmits the control means, the first and second focal length usable ranges, and the current focal length of the photographing lens set by the zoom driving means to the first or second camera body. A transmission means, and the determination means determines a usable focal length range according to its own image size from the first usable focal length range and the second usable focal length range. Provided is a camera system characterized in that, when the focal length of the current taking lens is outside the usable range of the selected focal length, it is determined that photographing is impossible. It is.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0018]
FIG. 1 is an external configuration diagram of a camera according to the first embodiment of the present invention.
[0019]
The figure shows a state in which the zoom lens 100 is attached to a camera body using an IX240 cartridge film (hereinafter referred to as IX240 body). The zoom lens 100 can also be attached to a digital camera body (hereinafter referred to as a digital body) that employs an image sensor such as a CCD. The zoom lens 100 is provided with a TELE SW 103 and a WIDESW 104 for zooming operation at predetermined side positions as shown in the drawing.
[0020]
FIG. 2 is a block diagram of a camera system employing the zoom lens and camera according to the first embodiment of the present invention.
[0021]
As shown in the figure, this camera system is constituted by an IX240 body 1 or a digital body 50 and a zoom lens 100.
[0022]
First, the internal configuration of the IX240 body 1 will be described.
[0023]
In FIG. 2, an FCPU 2 such as a microcomputer is provided inside the IX240 body 1 and is connected to the exposure control unit 6 so as to be communicable. The exposure control unit 6 performs exposure control on the body side such as a shutter. Further, the FCPU 2 is electrically connected to a 1RSW 5 that is turned on in the first stroke of the release operation and a 2RSW 5 that is turned on in the second stroke. Further, the IX240 body 1 is provided with a mount contact 3, and the FCPU 2 and the zoom lens side can communicate with each other by connecting to the mount contact of the zoom lens 100.
[0024]
The IX240 body 1 uses the IX240 cartridge film 7 as a recording medium. As shown in the figure, the image size of the IX240 cartridge film 7 is 27.4 mm × 15.6 mm in the H type, and the length of the diagonal line is 31.5 mm.
[0025]
Next, the internal configuration of the digital body 50 will be described.
[0026]
In FIG. 2, a DCPU 51 by a microcomputer or the like that controls the whole is provided inside the digital body 50, and this DCPU 51 includes an exposure control unit 60, a CCD driver 55, an image processing circuit 57, and an image recording circuit 58. Are connected to communicate freely. The exposure control unit 60 is for performing exposure control on the digital body 50 side such as a shutter. The CCD driver 55 is connected to the CCD 56 and drives and controls the CCD 56. The output of the CCD 56 is connected to an image processing circuit 57. The image processing circuit 57 performs processing such as A / D conversion, color conversion, and data compression on the image data obtained by the CCD 56.
[0027]
The output of the image processing circuit 57 is connected to the input of the image recording circuit 58, and the image recording circuit 58 writes the image data subjected to the various processes to the recording medium 59. In addition, the DCPU 51 is electrically connected to a 1RSW 53 that is turned on in the first stroke of the release operation and a 2RSW 54 that is turned on in the second stroke. The image size of the CCD 56 is 17 mm × 12 mm as shown in the figure, and the length of the diagonal line is 20.8 mm. Since the length of the diagonal line of the image size in the case of the IX240 body 1 is 31.5 mm, in the case of the digital body 50, the shooting field angle is narrowed to about 66%.
[0028]
Next, the internal configuration of the zoom lens 100 will be described.
[0029]
In FIG. 2, an LCPU 101 such as a microcomputer that controls the whole is provided inside the zoom lens 100. The output of the LCPU 101 is connected to the input of the zoom motor 105 via the zoom drive circuit 106. The zoom motor 105 is for driving a zooming mechanism, and is driven and controlled by a zoom drive circuit 106. The zoom state (corresponding to the focal length) of the zooming mechanism is detected by the zoom encoder 107, and the detection result is fed back to the LCPU 101.
[0030]
The output of the LCPU 101 is connected to the stepping motor 112 via the stepping motor drive circuit 113. The stepping motor 112 is for driving the aperture mechanism 111 and is driven and controlled by a stepping motor drive circuit 113. Further, the output of the LCPU 101 is connected to the input of the LD motor 108 via the LD motor driving circuit 109. The LD motor 108 drives a lens focusing mechanism, and is driven and controlled by an LD motor driving circuit 109. The driving amount of the LD motor 108 is detected by the LD encoder 110 and fed back to the LCPU 101.
[0031]
In addition, the LCPU 101 can communicate with the IX240 body 1 or the digital body 50 via the mount contact 102. The LCPU 101 is electrically connected to a TELE SW 103 for zooming to the TELE side and a WIDE SW 104 for zooming to the WIDE side.
[0032]
Here, with reference to FIG. 3, the difference in the zoom area of the zoom lens 100 when the IX240 body 1 and the digital body 50 are mounted will be described.
[0033]
The zoom lens of the present invention has different focal length variable ranges (hereinafter referred to as zoom ranges) when mounted on the IX240 body 1 and when mounted on the digital body 50. In FIG. 3, the horizontal axis represents the focal length of the zoom lens, and the vertical axis represents the number of resolutions at the periphery of the screen. The number of resolutions indicates how many lines can be resolved on the image plane when the designated test chart is photographed at the designated photographing magnification. Usually, it is shown in number / mm. The RPTH on the vertical axis indicates the number of resolutions that can be allowed at the periphery of the screen.
[0034]
The vertical axis in FIG. 3 represents the number of resolutions at the periphery of the screen, but does not represent the absolute value of (number / mm), but is represented as a relative value with respect to RPTH.
[0035]
Here, in the case of the IX240 body 1, the diagonal length of the image size (hereinafter referred to as IS) is IS = 31.5 mm, and the number of resolutions at the periphery of the screen is between the focal length of the lens of 35 mm to 105 mm. Exceeds RPTH. Therefore, a zoom range of 35 mm to 105 mm is a usable range.
[0036]
Further, in the case of the digital body 50, IS = 20.8 mm is small, so that the degradation of resolution at the periphery of the screen is small compared to the IX240 body 1. At the periphery of the screen, aberration increases and the image quality (number of resolutions) deteriorates, but the degree increases with the distance from the center of the screen. For this reason, in the case of the digital body 50, a zoom range of 28 mm to 120 mm is a usable range.
[0037]
Hereinafter, the operation sequence of the LCPU 101 of the zoom lens 100 will be described with reference to the flowchart of FIG.
[0038]
The LCPU 101 in the zoom lens 100 transmits / receives commands and data to / from the FCPU 2 or DCPU 51 in the body in response to a communication request from the FCPU 2 or DCPU 51 in the body, and will be described in detail below according to the received command data and control data. The predetermined operation is executed.
[0039]
That is, when a communication request is received from the body (step S1), communication with the body (body communication) is executed (step S2). The type of command data obtained by the body communication is determined, and if the command data is “image size / data write”, the process proceeds to step S4 (step S3).
[0040]
In step S2, the body image size data (IS) is sent as control data together with the command data. When the image size data is IS ≧ 23 mm, the zoom range is set to 35 mm to 105 mm. (Steps S4 and S5) If IS <23 mm, the zoom range is set to 28 mm to 120 mm (Steps S4 and S6).
[0041]
If the command data obtained by the body communication in step S2 is “zoom enable”, the subroutine “zoom enable” is executed (steps S7 and S8). The sequence of this subroutine “zoom enable” will be described in detail later with reference to FIG.
[0042]
If the command data obtained by the body communication in step S2 is “AV narrowing”, “AV narrowing” is performed (steps S9 and S10). In this “AV narrowing down”, the stepping motor 112 is driven to narrow down the diaphragm mechanism 111 under the control of the stepping motor drive circuit 113. In the body communication in step S2, since data corresponding to the number of narrowing stages from the release is received as control data following the command data, narrowing is performed according to the data. After the above operation is completed, communication with the body is performed, and command data indicating completion of AV narrowing is transmitted to the body side (step S11).
[0043]
If the command data obtained by the body communication in step S2 is “AV release”, “AV release” is performed (steps S12 and S13). This “AV opening” is an operation to open the aperture to the fully open state regardless of the current aperture state. Under the control of the stepping motor drive circuit 113, the stepping motor 112 is operated to open the aperture mechanism 111. It will open to the fully open state. After the completion of “AV release”, communication with the body is performed, and command data indicating the end of AV release is transmitted to the body (step S14).
[0044]
If the command data obtained by the body communication in step S2 is “LD drive”, “LD drive” is performed (steps S15 and S16). In this “LD drive”, the LD motor 108 is driven under the control of the LD motor drive circuit 109. At this time, the drive direction and the LD drive amount of the LD drive are specified by 2-byte data including the control data 1 and 2 communicated with the command data. After this “LD drive” is completed, body communication is performed, and command data indicating the end of LD drive is transmitted to the body (step S17).
[0045]
When the command data obtained by the body communication in step S2 is “focal length reading”, the zoom encoder value is read from the output signal from the zoom encoder 107 (steps S18 and S19). Then, the focal length of the lens is calculated from the read zoom encoder value (step S20), communicated with the body, and the focal length data is transmitted (step S21).
[0046]
When the command data obtained by the body communication in step S2 is “Lens wearing detection”, the body communicates with the body and transmits the lens ID number (type identification number) to the body (step S22, S23). It then communicates with the body to communicate lens parameters to the body. The parameters of the lens are parameters such as an open aperture value and the number of aperture stages (step s24).
[0047]
After completion of the above steps S5, S6, S11, S14, S17, S21, and S24 and when the determination in step S22 is No, the process returns to step S1.
[0048]
Next, a detailed sequence of the subroutine “zoom enable” executed in step S8 of FIG. 4 will be described with reference to the flowchart of FIG.
[0049]
When the subroutine “zoom enable” is entered, the state of the TELE SW 103 is first monitored (step S50). If the TELE SW 103 is ON, the zoom motor 105 and the zoom drive circuit 106 are operated to drive the TELE (zooming to the TELE side). ) Is started (step S51).
[0050]
Subsequently, in accordance with the output signal from the zoom encoder 107, it is determined whether or not the zooming mechanism has reached the TELE limit value of the zoom range (step S52). Here, when the TELE limit value is reached, a short brake (zoom motor short circuit) is applied to the zoom motor 105 (step S53), and the zoom motor 105 is turned off (non-operation) (step S54). The state of the TELE SW 103 is monitored, and it waits until the TELE SW is turned off. If it is turned off, the process proceeds to step S68 (step S55).
[0051]
On the other hand, when the zooming mechanism has not reached the TELE limit value of the zoom range in step S52, the LCPU 101 checks the state of the TELE SW 103 (step S56), and if the TELE SW 103 is ON, Returning to step S52, if the TELE SW 103 is OFF, a short brake (zoom motor short circuit) is applied to the zoom motor 105 (step S57), and the zoom motor 105 is turned OFF (non-operating) (step S58). The process proceeds to step S68.
[0052]
On the other hand, if the TELE SW 103 is OFF in step S50, the WIDE SW 104 is monitored (step S59). If the WIDE SW 104 is ON, the zoom motor 105 and the zoom drive circuit 106 are operated to operate the WIDE drive ( Zooming to the WIDE side is started (step S60). Subsequently, when the zooming mechanism has reached the wide limit value of the zoom range (step S61), a short brake (zoom motor short circuit) is applied to the zoom motor 105 (step S62), and the zoom motor 105 is turned off (step S62). Inactive) (step S63), monitors the state of the WIDE SW 104, waits until the WIDE SW 104 is turned off, and if the WIDE SW 104 is turned off, the process proceeds to step S68 (step S64). .
[0053]
On the other hand, if the zooming mechanism has not reached the wide limit value of the zoom range in step S61, the process returns to step S61 if the WIDE SW 104 is ON, and the zoom motor 105 is instructed if the WIDE SW 104 is OFF. Then, a short brake (zoom motor short circuit) is applied (step S66), the zoom motor 105 is turned off (non-operation), and the process proceeds to step S68 (step S67). In step S68, if there is a communication request from the CPU in the body, the process returns to step S2 in FIG. 4 described above, and if there is no communication request, the process returns to step S50 in FIG.
[0054]
Next, the sequence on the camera body side will be described in detail with reference to the flowchart of FIG.
[0055]
When a power supply SW (not shown) is turned on, communication with the zoom lens 100 is executed, and mounting of the zoom lens 100 is detected (step S100). At this time, the zoom lens 100 receives the zoom lens 100 ID number and lens parameters. If this communication is successful, it is determined that the zoom lens 100 is mounted, and the process proceeds to step S102. If the communication fails, it is determined that the zoom lens 100 is not mounted and step S100 is performed. Return to.
[0056]
Next, in step S102, communication with the zoom lens 100 is performed, and image size data (IS) corresponding to the body is transmitted from the body side. That is, when the body is the IX240 body 1, IS = 31.5 mm, and when the body is the digital body 50, IS = 20.8 mm is transmitted.
[0057]
Subsequently, the state of 1RSW4 or 53 is detected. If the 1RSW4 or 53 is ON, the process proceeds to step S106. If 1RSW4 or 53 is not ON, the process proceeds to step S104 to perform lens communication, and the lens is attached. Detection is performed (step S105). In step S105, if the lens is mounted, the process returns to step S103. If the lens is not mounted, the process returns to step S100.
[0058]
Next, communication with the zoom lens 100 is performed, and the focal length is read from the zoom lens 100 (step S106). Then, photometry is performed using a photometric element (not shown), and an exposure calculation is performed from the photometric result (step S107). Further, distance measurement is performed using a distance measuring element (not shown), and a lens driving amount is calculated from the distance measurement result (step S108).
[0059]
Subsequently, communication with the zoom lens 100 is performed, and LD driving is performed in accordance with the lens driving amount obtained above (step S109). Then, 2RSW5 or 54 is monitored. If 2RSW5 or 54 is ON, the process proceeds to step S112. If 2RSW5 or 54 is not ON, 1RSW4 or 53 is monitored in step S111, and if 1RSW4 or 53 is ON. The process returns to step S110, and if it is OFF, the process returns to step S103.
[0060]
In step S112, lens communication is performed to perform “AV narrowing down”. Then, exposure is performed (step S113). In the case of the IX 240 body 1, the exposure is performed on the film using the exposure control unit 6, and in the case of the digital body 50, the exposure control unit 60 is used to expose the image from the CCD image sensor. Get data.
[0061]
Next, lens communication is performed to perform “AV release” (step S114). Then, after the operation, the shutter in the exposure controller 6 or 60 is charged (step S115). The shutter is a focal plane shutter that operates by a spring force, and it is necessary to charge the spring after the operation.
[0062]
Subsequently, when the imaging medium is a film, that is, in the case of the IX240 body 1, the film is wound up, and then the process returns to step S103 (steps S116 and S117). On the other hand, when the image pickup medium is an image pickup element, that is, in the case of the digital body 50, the image processing circuit 57 is used to perform image data processing, and the image recording circuit 58 is used to execute the image data processing on the recording medium 59. The image data is recorded in step S103, and the process returns to step S103 (steps S116, S118, S119).
[0063]
Next, a second embodiment of the present invention will be described.
[0064]
FIG. 8 is a block diagram of a camera system that employs a zoom lens and a camera according to the second embodiment of the present invention. Here, the same components as those in FIG. 2 described above are denoted by the same reference numerals and description thereof is omitted.
[0065]
This camera system includes an IX240 body 1, a digital body 50, and a zoom lens 100. Explaining only the differences from the configuration of FIG. 2, a display unit 9 and a display driver 8 are provided in the IX240 body 1. The display unit 9 displays warnings and the like, and is driven and controlled by the display driver 8. Similarly, a display driver 61 and a display unit 62 are provided in the digital body 50. On the other hand, the zoom lens 100 is provided with a zoom tube 14 for performing a zoom operation. The form of the zoom ring 114 is as shown in FIG. This is an operation member for the photographer to perform zooming by manual operation. The zooming mechanism 115 is driven in conjunction with the driving of the zoom ring 114.
[0066]
The lens sequence of the LCPU 101 in the zoom lens 100 according to the second embodiment will be described below with reference to the flowchart in FIG.
[0067]
In addition, what attached the same step number as FIG. 4 shown previously performs the same operation | movement.
[0068]
When a communication request is received from the body (step S1), communication with the body (body communication) is executed (step S2). The type of command data obtained by this body communication is determined, and if the command data is “image size / data write”, the process proceeds to step S151 (step S150). In this step S151, the body image size data (IS) is transmitted as control data following the command data in the body communication, so this IS data is stored in the memory inside the LCPU 101.
[0069]
When the command data obtained by the body communication in step S2 is “read focal length” (step S152), the zoom encoder value is read from the output signal from the zoom encoder 107 (step S153). The focal length of the lens is calculated from the read zoom encoder value (step S154). When the image size / data stored in the memory in the LCPU 101 is IS <23 mm, the process proceeds to step S157, and when IS ≧ 23 mm, the process proceeds to step S156 (step S155).
[0070]
The process proceeds to step S156 when the IS is larger than 23 mm, but the zoom range in which the resolution characteristics of the peripheral portion of the screen are guaranteed is 35 mm to 105 mm. Therefore, shooting is performed when 35 mm ≦ focal length ≦ 105 mm. The process proceeds to step S157. On the other hand, when the focal length is <35 mm or the focal length> 105 mm, the resolution characteristics of the peripheral portion of the screen are not guaranteed, so body communication is performed in step S158, and command data indicating “cannot be released” is transmitted to the body. When the zoom range is a value that allows photographing, the focal length data is transmitted to the body (step S157). Other processes (steps S9 to S24) are the same as those in FIG.
[0071]
Next, the sequence on the body side in the second embodiment will be described in detail with reference to the flowchart of FIG.
[0072]
Note that steps that perform the same processing as in FIG. 6 according to the first embodiment described above are denoted by the same step numbers and description thereof is omitted.
[0073]
In steps S200 and S201, communication with the zoom lens 100 is executed, and mounting of the zoom lens 100 is detected. At this time, the zoom lens 100 receives the zoom lens 100 ID number and lens parameters. If this communication is successful, it is determined that the zoom lens 100 is mounted, and the process proceeds to step S103. If the communication fails, it is determined that the zoom lens 100 is not mounted and step S100 is performed. Return to.
[0074]
If the focal length data is received from the lens in step S106, it is determined that the release is possible, and the process proceeds to step S201. If the command data “Release not possible” is received from the lens, the release is not possible. Therefore, it progresses to step S202, the warning display which shows that the release is impossible is performed in the display part 9 or 62, and it returns to said step S103. Thus, since a predetermined warning is displayed when the release is impossible, malfunction can be prevented.
[0075]
Next, a third embodiment of the present invention will be described.
[0076]
The electric circuit configurations of the IX240 body 1, the digital body 50, and the zoom lens 100 constituting the third embodiment are the same as those of the second embodiment (FIG. 8) described above. In the description, the same reference numerals are used for the same constituent elements, and a duplicate description relating to the details of the configuration is omitted.
[0077]
The lens sequence executed by the LCPU 101 in the zoom lens 100 according to the third embodiment will be described below with reference to the flowchart of FIG.
[0078]
In FIG. 11, steps that perform the same processing as in FIG. 4 are given the same step numbers, and detailed descriptions thereof are omitted.
[0079]
In FIG. 11, after performing the same processing as steps S <b> 1 and S <b> 2 and FIG. 4, when the command data obtained by the body communication is “lens wearing detection”, the process proceeds to step S <b> 251 (step S <b> 250). The subsequent processing is a feature.
[0080]
In other words, in this embodiment, when lens attachment is detected, communication is first performed with the body, and a lens ID number is transmitted to the body (step S251), communication with the body is performed, and zoom range 1 ( (Zoomable zoom range when IS <23 mm) is transmitted (step S252), communication with the body is performed, and zoom range 2 (zoomable zoom range when IS = 23mm) is transmitted to the body ( Step S253) Communicates with the body, and communicates lens parameters to the body. The parameters of the lens are parameters such as the maximum aperture value and the number of apertures (step S254).
[0081]
Next, a sequence on the camera body side will be described with reference to FIG.
[0082]
In FIG. 12, steps that perform the same processing as in FIG. 6 are given the same step numbers, and detailed descriptions thereof are omitted.
[0083]
When a power switch (not shown) is turned on, lens communication is first performed to detect whether the zoom lens 100 is attached. Here, the ID number, zoom range 1, zoom range 2, and lens parameter information of the zoom lens 100 are received from the zoom lens 100 (step S300). In step S301 in the figure, the same processing as in step S301 is executed.
[0084]
In step S302, depending on the image size of the body, the process proceeds to step S107 when IS <23 mm, and the process proceeds to step S303 when IS ≧ 23 mm. In this step S303, when the focal length of the zoom lens 100 received from the zoom lens 100 in step S106 is within the range of the zoom range 2, the resolution characteristic of the peripheral portion of the screen is guaranteed, so that release is possible. As it is, the process proceeds to step S107. On the other hand, if the focal length is not within the range of the zoom range 2, the resolution characteristic of the peripheral portion of the screen is not guaranteed, so it is determined that the release is impossible and the process proceeds to step S304. In step S304, the display unit 9 or 62 displays a warning indicating that the release is impossible, and then returns to step S103.
[0085]
In addition, the following invention is contained in the said embodiment of this invention.
[0086]
That is, at least two or more types of camera bodies having different image sizes and a zoom lens that can be attached to the camera bodies having different image sizes and can be used in common, the zoom lens further includes the camera body and Communication means for performing communication and receiving data specific to the camera body, zoom range determining means for determining a zoom range according to data corresponding to the camera body obtained by the communication means, and There is provided a camera system comprising zoom drive means for performing zoom drive within the range of the zoom range determined by the zoom range determination means.
[0087]
【The invention's effect】
  As detailed above, according to the present invention,,smallImage sizeMosquitoLarge image size even when mounted on a melody bodyMosquitoAttached to mela bodyEven in this case, it is possible to perform photographing suitable for the image size of the camera body to which the interchangeable lens is attached. For example, depending on the image size of the camera body to which this interchangeable lens is attached,Focal length variable rangeThis makes it possible to take pictures suitable for this camera body.Can.
[Brief description of the drawings]
FIG. 1 is an external configuration diagram of a camera according to a first embodiment of the present invention.
FIG. 2 is a block configuration diagram of a camera system that employs a zoom lens and a camera according to a first embodiment of the present invention.
FIG. 3 is a diagram for explaining a difference in zoom area of the zoom lens 100 when the IX240 body 1 and the digital body 50 are mounted.
FIG. 4 is a flowchart illustrating an operation sequence of the LCPU 101 of the zoom lens 100 according to the first embodiment.
FIG. 5 is a flowchart showing a detailed sequence of a subroutine “zoom enable” executed in step S8 of FIG. 4;
FIG. 6 is a flowchart illustrating a sequence on the camera body side according to the first embodiment.
FIG. 7 is an external configuration diagram of a second embodiment of the present invention.
FIG. 8 is a block diagram of a camera system employing a zoom lens and a camera according to a second embodiment of the present invention.
FIG. 9 is a flowchart illustrating a lens sequence of the LCPU 101 in the zoom lens 100 according to the second embodiment.
FIG. 10 is a flowchart showing in detail a sequence on the body side in the second embodiment.
FIG. 11 is a flowchart illustrating a lens sequence executed by the LCPU 101 in the zoom lens 100 according to the third embodiment.
FIG. 12 is a flowchart illustrating a sequence on the camera body side according to the third embodiment.
[Explanation of symbols]
1 Camera body
2 FCPU
3
4 1RSW
5 2RSW
6 Exposure control unit
7 Film
50 camera body
51 DCPU
52
53 1RSW
54 2RSW
55 CCD driver
56 CCD
57 Image processing circuit
58 Image recording circuit
59 Recording media
60 Exposure control unit
100 zoom lens
101 LCPU
102
103 TELE SW
104 WIDE SW
105 Zoom motor
106 Zoom drive circuit
107 Zoom encoder
108 LD motor
109 LD motor drive circuit
110 LD encoder
111 Aperture mechanism
112 Stepping motor
113 Stepping motor drive circuit

Claims (7)

An interchangeable lens that can be used in common for a first camera body having a first image size and a second camera body having a second image size different from the first image size,
Zoom driving means for varying the focal length of the taking lens in the interchangeable lens within a predetermined focal length range;
Receiving means for receiving information relating to the image size of the camera body from the camera body on which the interchangeable lens is mounted;
Control means for performing sequence control inside the interchangeable lens,
The control means may use a focal length usable range in which the resolving power of the screen peripheral portion in the photographed image of the camera body on which the interchangeable lens is mounted is a predetermined value or more according to the information on the image size received by the receiving means. And the predetermined focal length range of the zoom driving means is changed to the determined focal length usable range . An interchangeable lens that can be used in common for a first camera body having a first image size and a second camera body having a second image size different from the first image size,
Zoom driving means for varying the focal length of the taking lens in the interchangeable lens within a predetermined focal length range;
Receiving means for receiving information relating to the image size of the camera body from the camera body on which the interchangeable lens is mounted;
Control means for performing sequence control inside the interchangeable lens,
The control means may use a focal length usable range in which the resolving power of the screen peripheral portion in the photographed image of the camera body on which the interchangeable lens is mounted is a predetermined value or more according to the information on the image size received by the receiving means. If the current focal length of the photographing lens is outside the focal length use range, it is determined that photographing is impossible, and data indicating that the photographing is impossible is attached to the interchangeable lens. The interchangeable lens is characterized by transmitting to a camera body. The first camera body having the first image size, the second camera body having the second image size different from the first image size, and the first and second camera bodies can be used in common. In a camera system consisting of various interchangeable lenses,
Each of the first and second camera bodies has transmission means for transmitting information relating to the image size of its own camera body to the mounted interchangeable lens,
The interchangeable lens
Zoom driving means for varying the focal length of the taking lens in the interchangeable lens within a predetermined focal length range;
Receiving means for receiving information relating to the image size of the camera body from the camera body on which the interchangeable lens is mounted;
Control means for performing sequence control inside the interchangeable lens,
The control means may use a focal length usable range in which the resolving power of the screen peripheral portion in the photographed image of the camera body on which the interchangeable lens is mounted is a predetermined value or more according to the information on the image size received by the receiving means. And the predetermined focal length range of the zoom driving means is changed to the determined focal length usable range . The first camera body having the first image size, the second camera body having the second image size different from the first image size, and the first and second camera bodies can be used in common. In a camera system consisting of various interchangeable lenses,
Each of the first and second camera bodies has transmission means for transmitting information relating to the image size of its own camera body to the mounted interchangeable lens,
The interchangeable lens
Zoom driving means for varying the focal length of the taking lens in the interchangeable lens within a predetermined focal length range;
Receiving means for receiving information relating to the image size of the camera body from the camera body on which the interchangeable lens is mounted;
Control means for performing sequence control inside the interchangeable lens,
The control means determines a focal length use range in which the resolving power of the periphery of the screen in the photographed image of the camera body to which the interchangeable lens is attached is a predetermined value or more according to the information on the image size received by the receiving means. If the current focal length of the photographing lens is outside the focal length use range, it is determined that photographing is impossible, and data indicating that the photographing is impossible is attached to the interchangeable lens. A camera system characterized by transmitting to a camera body . Further, the first and second camera bodies have warning means for giving a warning when data indicating that the photographing is impossible is received from the control means. The camera system described. The first camera body having the first image size, the second camera body having the second image size different from the first image size, and the first and second camera bodies can be used in common. In a camera system consisting of various interchangeable lenses,
The first and second camera bodies are
Body-side receiving means for receiving data from the interchangeable lens;
Determining means for determining whether or not shooting is possible;
Have
The interchangeable lens
Zoom drive means for varying the focal length of the taking lens in the interchangeable lens within a predetermined focal length range;
A first focal length usable range in which the sequence control inside the interchangeable lens is performed and the resolving power of the peripheral portion of the screen in the captured image corresponding to the first image size of the first camera body is a predetermined value or more; Control means for storing a second focal length usable range in which the resolving power of the screen peripheral portion in the captured image corresponding to the second image size of the second camera body is equal to or greater than a predetermined value;
Interchangeable lens side transmission means for transmitting the first and second focal length usable ranges and the current focal length of the photographing lens set by the zoom driving means to the first or second camera body; ,
Have
The determination means selects a focal length usable range corresponding to its own image size from the first focal length usable range and the second focal length usable range, and the current photographing A camera system, characterized in that it is determined that photographing is impossible when the focal length of a lens is outside the selected focal length usable range. The camera system according to claim 6, further comprising warning means for giving a warning when it is determined that the photographing is impossible.

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